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1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
6 *
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/debugfs.h>
19#include <linux/device.h>
20#include <linux/slab.h>
21#include <linux/async.h>
22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
25#include <linux/delay.h>
26#include <linux/gpio.h>
27#include <linux/gpio/consumer.h>
28#include <linux/of.h>
29#include <linux/regmap.h>
30#include <linux/regulator/of_regulator.h>
31#include <linux/regulator/consumer.h>
32#include <linux/regulator/driver.h>
33#include <linux/regulator/machine.h>
34#include <linux/module.h>
35
36#define CREATE_TRACE_POINTS
37#include <trace/events/regulator.h>
38
39#include "dummy.h"
40#include "internal.h"
41
42#define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44#define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50#define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
52
53static DEFINE_MUTEX(regulator_list_mutex);
54static LIST_HEAD(regulator_map_list);
55static LIST_HEAD(regulator_ena_gpio_list);
56static LIST_HEAD(regulator_supply_alias_list);
57static bool has_full_constraints;
58
59static struct dentry *debugfs_root;
60
61static struct class regulator_class;
62
63/*
64 * struct regulator_map
65 *
66 * Used to provide symbolic supply names to devices.
67 */
68struct regulator_map {
69 struct list_head list;
70 const char *dev_name; /* The dev_name() for the consumer */
71 const char *supply;
72 struct regulator_dev *regulator;
73};
74
75/*
76 * struct regulator_enable_gpio
77 *
78 * Management for shared enable GPIO pin
79 */
80struct regulator_enable_gpio {
81 struct list_head list;
82 struct gpio_desc *gpiod;
83 u32 enable_count; /* a number of enabled shared GPIO */
84 u32 request_count; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert:1;
86};
87
88/*
89 * struct regulator_supply_alias
90 *
91 * Used to map lookups for a supply onto an alternative device.
92 */
93struct regulator_supply_alias {
94 struct list_head list;
95 struct device *src_dev;
96 const char *src_supply;
97 struct device *alias_dev;
98 const char *alias_supply;
99};
100
101static int _regulator_is_enabled(struct regulator_dev *rdev);
102static int _regulator_disable(struct regulator_dev *rdev);
103static int _regulator_get_voltage(struct regulator_dev *rdev);
104static int _regulator_get_current_limit(struct regulator_dev *rdev);
105static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
106static int _notifier_call_chain(struct regulator_dev *rdev,
107 unsigned long event, void *data);
108static int _regulator_do_set_voltage(struct regulator_dev *rdev,
109 int min_uV, int max_uV);
110static struct regulator *create_regulator(struct regulator_dev *rdev,
111 struct device *dev,
112 const char *supply_name);
113static void _regulator_put(struct regulator *regulator);
114
115static struct regulator_dev *dev_to_rdev(struct device *dev)
116{
117 return container_of(dev, struct regulator_dev, dev);
118}
119
120static const char *rdev_get_name(struct regulator_dev *rdev)
121{
122 if (rdev->constraints && rdev->constraints->name)
123 return rdev->constraints->name;
124 else if (rdev->desc->name)
125 return rdev->desc->name;
126 else
127 return "";
128}
129
130static bool have_full_constraints(void)
131{
132 return has_full_constraints || of_have_populated_dt();
133}
134
135static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev)
136{
137 if (rdev && rdev->supply)
138 return rdev->supply->rdev;
139
140 return NULL;
141}
142
143/**
144 * regulator_lock_supply - lock a regulator and its supplies
145 * @rdev: regulator source
146 */
147static void regulator_lock_supply(struct regulator_dev *rdev)
148{
149 int i;
150
151 for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++)
152 mutex_lock_nested(&rdev->mutex, i);
153}
154
155/**
156 * regulator_unlock_supply - unlock a regulator and its supplies
157 * @rdev: regulator source
158 */
159static void regulator_unlock_supply(struct regulator_dev *rdev)
160{
161 struct regulator *supply;
162
163 while (1) {
164 mutex_unlock(&rdev->mutex);
165 supply = rdev->supply;
166
167 if (!rdev->supply)
168 return;
169
170 rdev = supply->rdev;
171 }
172}
173
174/**
175 * of_get_regulator - get a regulator device node based on supply name
176 * @dev: Device pointer for the consumer (of regulator) device
177 * @supply: regulator supply name
178 *
179 * Extract the regulator device node corresponding to the supply name.
180 * returns the device node corresponding to the regulator if found, else
181 * returns NULL.
182 */
183static struct device_node *of_get_regulator(struct device *dev, const char *supply)
184{
185 struct device_node *regnode = NULL;
186 char prop_name[32]; /* 32 is max size of property name */
187
188 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
189
190 snprintf(prop_name, 32, "%s-supply", supply);
191 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
192
193 if (!regnode) {
194 dev_dbg(dev, "Looking up %s property in node %s failed",
195 prop_name, dev->of_node->full_name);
196 return NULL;
197 }
198 return regnode;
199}
200
201static int _regulator_can_change_status(struct regulator_dev *rdev)
202{
203 if (!rdev->constraints)
204 return 0;
205
206 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
207 return 1;
208 else
209 return 0;
210}
211
212/* Platform voltage constraint check */
213static int regulator_check_voltage(struct regulator_dev *rdev,
214 int *min_uV, int *max_uV)
215{
216 BUG_ON(*min_uV > *max_uV);
217
218 if (!rdev->constraints) {
219 rdev_err(rdev, "no constraints\n");
220 return -ENODEV;
221 }
222 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
223 rdev_err(rdev, "voltage operation not allowed\n");
224 return -EPERM;
225 }
226
227 if (*max_uV > rdev->constraints->max_uV)
228 *max_uV = rdev->constraints->max_uV;
229 if (*min_uV < rdev->constraints->min_uV)
230 *min_uV = rdev->constraints->min_uV;
231
232 if (*min_uV > *max_uV) {
233 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
234 *min_uV, *max_uV);
235 return -EINVAL;
236 }
237
238 return 0;
239}
240
241/* Make sure we select a voltage that suits the needs of all
242 * regulator consumers
243 */
244static int regulator_check_consumers(struct regulator_dev *rdev,
245 int *min_uV, int *max_uV)
246{
247 struct regulator *regulator;
248
249 list_for_each_entry(regulator, &rdev->consumer_list, list) {
250 /*
251 * Assume consumers that didn't say anything are OK
252 * with anything in the constraint range.
253 */
254 if (!regulator->min_uV && !regulator->max_uV)
255 continue;
256
257 if (*max_uV > regulator->max_uV)
258 *max_uV = regulator->max_uV;
259 if (*min_uV < regulator->min_uV)
260 *min_uV = regulator->min_uV;
261 }
262
263 if (*min_uV > *max_uV) {
264 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
265 *min_uV, *max_uV);
266 return -EINVAL;
267 }
268
269 return 0;
270}
271
272/* current constraint check */
273static int regulator_check_current_limit(struct regulator_dev *rdev,
274 int *min_uA, int *max_uA)
275{
276 BUG_ON(*min_uA > *max_uA);
277
278 if (!rdev->constraints) {
279 rdev_err(rdev, "no constraints\n");
280 return -ENODEV;
281 }
282 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
283 rdev_err(rdev, "current operation not allowed\n");
284 return -EPERM;
285 }
286
287 if (*max_uA > rdev->constraints->max_uA)
288 *max_uA = rdev->constraints->max_uA;
289 if (*min_uA < rdev->constraints->min_uA)
290 *min_uA = rdev->constraints->min_uA;
291
292 if (*min_uA > *max_uA) {
293 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
294 *min_uA, *max_uA);
295 return -EINVAL;
296 }
297
298 return 0;
299}
300
301/* operating mode constraint check */
302static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
303{
304 switch (*mode) {
305 case REGULATOR_MODE_FAST:
306 case REGULATOR_MODE_NORMAL:
307 case REGULATOR_MODE_IDLE:
308 case REGULATOR_MODE_STANDBY:
309 break;
310 default:
311 rdev_err(rdev, "invalid mode %x specified\n", *mode);
312 return -EINVAL;
313 }
314
315 if (!rdev->constraints) {
316 rdev_err(rdev, "no constraints\n");
317 return -ENODEV;
318 }
319 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
320 rdev_err(rdev, "mode operation not allowed\n");
321 return -EPERM;
322 }
323
324 /* The modes are bitmasks, the most power hungry modes having
325 * the lowest values. If the requested mode isn't supported
326 * try higher modes. */
327 while (*mode) {
328 if (rdev->constraints->valid_modes_mask & *mode)
329 return 0;
330 *mode /= 2;
331 }
332
333 return -EINVAL;
334}
335
336/* dynamic regulator mode switching constraint check */
337static int regulator_check_drms(struct regulator_dev *rdev)
338{
339 if (!rdev->constraints) {
340 rdev_err(rdev, "no constraints\n");
341 return -ENODEV;
342 }
343 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
344 rdev_dbg(rdev, "drms operation not allowed\n");
345 return -EPERM;
346 }
347 return 0;
348}
349
350static ssize_t regulator_uV_show(struct device *dev,
351 struct device_attribute *attr, char *buf)
352{
353 struct regulator_dev *rdev = dev_get_drvdata(dev);
354 ssize_t ret;
355
356 mutex_lock(&rdev->mutex);
357 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
358 mutex_unlock(&rdev->mutex);
359
360 return ret;
361}
362static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
363
364static ssize_t regulator_uA_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
366{
367 struct regulator_dev *rdev = dev_get_drvdata(dev);
368
369 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
370}
371static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
372
373static ssize_t name_show(struct device *dev, struct device_attribute *attr,
374 char *buf)
375{
376 struct regulator_dev *rdev = dev_get_drvdata(dev);
377
378 return sprintf(buf, "%s\n", rdev_get_name(rdev));
379}
380static DEVICE_ATTR_RO(name);
381
382static ssize_t regulator_print_opmode(char *buf, int mode)
383{
384 switch (mode) {
385 case REGULATOR_MODE_FAST:
386 return sprintf(buf, "fast\n");
387 case REGULATOR_MODE_NORMAL:
388 return sprintf(buf, "normal\n");
389 case REGULATOR_MODE_IDLE:
390 return sprintf(buf, "idle\n");
391 case REGULATOR_MODE_STANDBY:
392 return sprintf(buf, "standby\n");
393 }
394 return sprintf(buf, "unknown\n");
395}
396
397static ssize_t regulator_opmode_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
399{
400 struct regulator_dev *rdev = dev_get_drvdata(dev);
401
402 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
403}
404static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
405
406static ssize_t regulator_print_state(char *buf, int state)
407{
408 if (state > 0)
409 return sprintf(buf, "enabled\n");
410 else if (state == 0)
411 return sprintf(buf, "disabled\n");
412 else
413 return sprintf(buf, "unknown\n");
414}
415
416static ssize_t regulator_state_show(struct device *dev,
417 struct device_attribute *attr, char *buf)
418{
419 struct regulator_dev *rdev = dev_get_drvdata(dev);
420 ssize_t ret;
421
422 mutex_lock(&rdev->mutex);
423 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
424 mutex_unlock(&rdev->mutex);
425
426 return ret;
427}
428static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
429
430static ssize_t regulator_status_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
432{
433 struct regulator_dev *rdev = dev_get_drvdata(dev);
434 int status;
435 char *label;
436
437 status = rdev->desc->ops->get_status(rdev);
438 if (status < 0)
439 return status;
440
441 switch (status) {
442 case REGULATOR_STATUS_OFF:
443 label = "off";
444 break;
445 case REGULATOR_STATUS_ON:
446 label = "on";
447 break;
448 case REGULATOR_STATUS_ERROR:
449 label = "error";
450 break;
451 case REGULATOR_STATUS_FAST:
452 label = "fast";
453 break;
454 case REGULATOR_STATUS_NORMAL:
455 label = "normal";
456 break;
457 case REGULATOR_STATUS_IDLE:
458 label = "idle";
459 break;
460 case REGULATOR_STATUS_STANDBY:
461 label = "standby";
462 break;
463 case REGULATOR_STATUS_BYPASS:
464 label = "bypass";
465 break;
466 case REGULATOR_STATUS_UNDEFINED:
467 label = "undefined";
468 break;
469 default:
470 return -ERANGE;
471 }
472
473 return sprintf(buf, "%s\n", label);
474}
475static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
476
477static ssize_t regulator_min_uA_show(struct device *dev,
478 struct device_attribute *attr, char *buf)
479{
480 struct regulator_dev *rdev = dev_get_drvdata(dev);
481
482 if (!rdev->constraints)
483 return sprintf(buf, "constraint not defined\n");
484
485 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
486}
487static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
488
489static ssize_t regulator_max_uA_show(struct device *dev,
490 struct device_attribute *attr, char *buf)
491{
492 struct regulator_dev *rdev = dev_get_drvdata(dev);
493
494 if (!rdev->constraints)
495 return sprintf(buf, "constraint not defined\n");
496
497 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
498}
499static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
500
501static ssize_t regulator_min_uV_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
503{
504 struct regulator_dev *rdev = dev_get_drvdata(dev);
505
506 if (!rdev->constraints)
507 return sprintf(buf, "constraint not defined\n");
508
509 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
510}
511static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
512
513static ssize_t regulator_max_uV_show(struct device *dev,
514 struct device_attribute *attr, char *buf)
515{
516 struct regulator_dev *rdev = dev_get_drvdata(dev);
517
518 if (!rdev->constraints)
519 return sprintf(buf, "constraint not defined\n");
520
521 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
522}
523static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
524
525static ssize_t regulator_total_uA_show(struct device *dev,
526 struct device_attribute *attr, char *buf)
527{
528 struct regulator_dev *rdev = dev_get_drvdata(dev);
529 struct regulator *regulator;
530 int uA = 0;
531
532 mutex_lock(&rdev->mutex);
533 list_for_each_entry(regulator, &rdev->consumer_list, list)
534 uA += regulator->uA_load;
535 mutex_unlock(&rdev->mutex);
536 return sprintf(buf, "%d\n", uA);
537}
538static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
539
540static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
541 char *buf)
542{
543 struct regulator_dev *rdev = dev_get_drvdata(dev);
544 return sprintf(buf, "%d\n", rdev->use_count);
545}
546static DEVICE_ATTR_RO(num_users);
547
548static ssize_t type_show(struct device *dev, struct device_attribute *attr,
549 char *buf)
550{
551 struct regulator_dev *rdev = dev_get_drvdata(dev);
552
553 switch (rdev->desc->type) {
554 case REGULATOR_VOLTAGE:
555 return sprintf(buf, "voltage\n");
556 case REGULATOR_CURRENT:
557 return sprintf(buf, "current\n");
558 }
559 return sprintf(buf, "unknown\n");
560}
561static DEVICE_ATTR_RO(type);
562
563static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
564 struct device_attribute *attr, char *buf)
565{
566 struct regulator_dev *rdev = dev_get_drvdata(dev);
567
568 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
569}
570static DEVICE_ATTR(suspend_mem_microvolts, 0444,
571 regulator_suspend_mem_uV_show, NULL);
572
573static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
574 struct device_attribute *attr, char *buf)
575{
576 struct regulator_dev *rdev = dev_get_drvdata(dev);
577
578 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
579}
580static DEVICE_ATTR(suspend_disk_microvolts, 0444,
581 regulator_suspend_disk_uV_show, NULL);
582
583static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
584 struct device_attribute *attr, char *buf)
585{
586 struct regulator_dev *rdev = dev_get_drvdata(dev);
587
588 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
589}
590static DEVICE_ATTR(suspend_standby_microvolts, 0444,
591 regulator_suspend_standby_uV_show, NULL);
592
593static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
594 struct device_attribute *attr, char *buf)
595{
596 struct regulator_dev *rdev = dev_get_drvdata(dev);
597
598 return regulator_print_opmode(buf,
599 rdev->constraints->state_mem.mode);
600}
601static DEVICE_ATTR(suspend_mem_mode, 0444,
602 regulator_suspend_mem_mode_show, NULL);
603
604static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
605 struct device_attribute *attr, char *buf)
606{
607 struct regulator_dev *rdev = dev_get_drvdata(dev);
608
609 return regulator_print_opmode(buf,
610 rdev->constraints->state_disk.mode);
611}
612static DEVICE_ATTR(suspend_disk_mode, 0444,
613 regulator_suspend_disk_mode_show, NULL);
614
615static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
616 struct device_attribute *attr, char *buf)
617{
618 struct regulator_dev *rdev = dev_get_drvdata(dev);
619
620 return regulator_print_opmode(buf,
621 rdev->constraints->state_standby.mode);
622}
623static DEVICE_ATTR(suspend_standby_mode, 0444,
624 regulator_suspend_standby_mode_show, NULL);
625
626static ssize_t regulator_suspend_mem_state_show(struct device *dev,
627 struct device_attribute *attr, char *buf)
628{
629 struct regulator_dev *rdev = dev_get_drvdata(dev);
630
631 return regulator_print_state(buf,
632 rdev->constraints->state_mem.enabled);
633}
634static DEVICE_ATTR(suspend_mem_state, 0444,
635 regulator_suspend_mem_state_show, NULL);
636
637static ssize_t regulator_suspend_disk_state_show(struct device *dev,
638 struct device_attribute *attr, char *buf)
639{
640 struct regulator_dev *rdev = dev_get_drvdata(dev);
641
642 return regulator_print_state(buf,
643 rdev->constraints->state_disk.enabled);
644}
645static DEVICE_ATTR(suspend_disk_state, 0444,
646 regulator_suspend_disk_state_show, NULL);
647
648static ssize_t regulator_suspend_standby_state_show(struct device *dev,
649 struct device_attribute *attr, char *buf)
650{
651 struct regulator_dev *rdev = dev_get_drvdata(dev);
652
653 return regulator_print_state(buf,
654 rdev->constraints->state_standby.enabled);
655}
656static DEVICE_ATTR(suspend_standby_state, 0444,
657 regulator_suspend_standby_state_show, NULL);
658
659static ssize_t regulator_bypass_show(struct device *dev,
660 struct device_attribute *attr, char *buf)
661{
662 struct regulator_dev *rdev = dev_get_drvdata(dev);
663 const char *report;
664 bool bypass;
665 int ret;
666
667 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
668
669 if (ret != 0)
670 report = "unknown";
671 else if (bypass)
672 report = "enabled";
673 else
674 report = "disabled";
675
676 return sprintf(buf, "%s\n", report);
677}
678static DEVICE_ATTR(bypass, 0444,
679 regulator_bypass_show, NULL);
680
681/* Calculate the new optimum regulator operating mode based on the new total
682 * consumer load. All locks held by caller */
683static int drms_uA_update(struct regulator_dev *rdev)
684{
685 struct regulator *sibling;
686 int current_uA = 0, output_uV, input_uV, err;
687 unsigned int mode;
688
689 lockdep_assert_held_once(&rdev->mutex);
690
691 /*
692 * first check to see if we can set modes at all, otherwise just
693 * tell the consumer everything is OK.
694 */
695 err = regulator_check_drms(rdev);
696 if (err < 0)
697 return 0;
698
699 if (!rdev->desc->ops->get_optimum_mode &&
700 !rdev->desc->ops->set_load)
701 return 0;
702
703 if (!rdev->desc->ops->set_mode &&
704 !rdev->desc->ops->set_load)
705 return -EINVAL;
706
707 /* get output voltage */
708 output_uV = _regulator_get_voltage(rdev);
709 if (output_uV <= 0) {
710 rdev_err(rdev, "invalid output voltage found\n");
711 return -EINVAL;
712 }
713
714 /* get input voltage */
715 input_uV = 0;
716 if (rdev->supply)
717 input_uV = regulator_get_voltage(rdev->supply);
718 if (input_uV <= 0)
719 input_uV = rdev->constraints->input_uV;
720 if (input_uV <= 0) {
721 rdev_err(rdev, "invalid input voltage found\n");
722 return -EINVAL;
723 }
724
725 /* calc total requested load */
726 list_for_each_entry(sibling, &rdev->consumer_list, list)
727 current_uA += sibling->uA_load;
728
729 current_uA += rdev->constraints->system_load;
730
731 if (rdev->desc->ops->set_load) {
732 /* set the optimum mode for our new total regulator load */
733 err = rdev->desc->ops->set_load(rdev, current_uA);
734 if (err < 0)
735 rdev_err(rdev, "failed to set load %d\n", current_uA);
736 } else {
737 /* now get the optimum mode for our new total regulator load */
738 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
739 output_uV, current_uA);
740
741 /* check the new mode is allowed */
742 err = regulator_mode_constrain(rdev, &mode);
743 if (err < 0) {
744 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
745 current_uA, input_uV, output_uV);
746 return err;
747 }
748
749 err = rdev->desc->ops->set_mode(rdev, mode);
750 if (err < 0)
751 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
752 }
753
754 return err;
755}
756
757static int suspend_set_state(struct regulator_dev *rdev,
758 struct regulator_state *rstate)
759{
760 int ret = 0;
761
762 /* If we have no suspend mode configration don't set anything;
763 * only warn if the driver implements set_suspend_voltage or
764 * set_suspend_mode callback.
765 */
766 if (!rstate->enabled && !rstate->disabled) {
767 if (rdev->desc->ops->set_suspend_voltage ||
768 rdev->desc->ops->set_suspend_mode)
769 rdev_warn(rdev, "No configuration\n");
770 return 0;
771 }
772
773 if (rstate->enabled && rstate->disabled) {
774 rdev_err(rdev, "invalid configuration\n");
775 return -EINVAL;
776 }
777
778 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
779 ret = rdev->desc->ops->set_suspend_enable(rdev);
780 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
781 ret = rdev->desc->ops->set_suspend_disable(rdev);
782 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
783 ret = 0;
784
785 if (ret < 0) {
786 rdev_err(rdev, "failed to enabled/disable\n");
787 return ret;
788 }
789
790 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
791 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
792 if (ret < 0) {
793 rdev_err(rdev, "failed to set voltage\n");
794 return ret;
795 }
796 }
797
798 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
799 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
800 if (ret < 0) {
801 rdev_err(rdev, "failed to set mode\n");
802 return ret;
803 }
804 }
805 return ret;
806}
807
808/* locks held by caller */
809static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
810{
811 lockdep_assert_held_once(&rdev->mutex);
812
813 if (!rdev->constraints)
814 return -EINVAL;
815
816 switch (state) {
817 case PM_SUSPEND_STANDBY:
818 return suspend_set_state(rdev,
819 &rdev->constraints->state_standby);
820 case PM_SUSPEND_MEM:
821 return suspend_set_state(rdev,
822 &rdev->constraints->state_mem);
823 case PM_SUSPEND_MAX:
824 return suspend_set_state(rdev,
825 &rdev->constraints->state_disk);
826 default:
827 return -EINVAL;
828 }
829}
830
831static void print_constraints(struct regulator_dev *rdev)
832{
833 struct regulation_constraints *constraints = rdev->constraints;
834 char buf[160] = "";
835 size_t len = sizeof(buf) - 1;
836 int count = 0;
837 int ret;
838
839 if (constraints->min_uV && constraints->max_uV) {
840 if (constraints->min_uV == constraints->max_uV)
841 count += scnprintf(buf + count, len - count, "%d mV ",
842 constraints->min_uV / 1000);
843 else
844 count += scnprintf(buf + count, len - count,
845 "%d <--> %d mV ",
846 constraints->min_uV / 1000,
847 constraints->max_uV / 1000);
848 }
849
850 if (!constraints->min_uV ||
851 constraints->min_uV != constraints->max_uV) {
852 ret = _regulator_get_voltage(rdev);
853 if (ret > 0)
854 count += scnprintf(buf + count, len - count,
855 "at %d mV ", ret / 1000);
856 }
857
858 if (constraints->uV_offset)
859 count += scnprintf(buf + count, len - count, "%dmV offset ",
860 constraints->uV_offset / 1000);
861
862 if (constraints->min_uA && constraints->max_uA) {
863 if (constraints->min_uA == constraints->max_uA)
864 count += scnprintf(buf + count, len - count, "%d mA ",
865 constraints->min_uA / 1000);
866 else
867 count += scnprintf(buf + count, len - count,
868 "%d <--> %d mA ",
869 constraints->min_uA / 1000,
870 constraints->max_uA / 1000);
871 }
872
873 if (!constraints->min_uA ||
874 constraints->min_uA != constraints->max_uA) {
875 ret = _regulator_get_current_limit(rdev);
876 if (ret > 0)
877 count += scnprintf(buf + count, len - count,
878 "at %d mA ", ret / 1000);
879 }
880
881 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
882 count += scnprintf(buf + count, len - count, "fast ");
883 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
884 count += scnprintf(buf + count, len - count, "normal ");
885 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
886 count += scnprintf(buf + count, len - count, "idle ");
887 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
888 count += scnprintf(buf + count, len - count, "standby");
889
890 if (!count)
891 scnprintf(buf, len, "no parameters");
892
893 rdev_dbg(rdev, "%s\n", buf);
894
895 if ((constraints->min_uV != constraints->max_uV) &&
896 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
897 rdev_warn(rdev,
898 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
899}
900
901static int machine_constraints_voltage(struct regulator_dev *rdev,
902 struct regulation_constraints *constraints)
903{
904 const struct regulator_ops *ops = rdev->desc->ops;
905 int ret;
906
907 /* do we need to apply the constraint voltage */
908 if (rdev->constraints->apply_uV &&
909 rdev->constraints->min_uV == rdev->constraints->max_uV) {
910 int current_uV = _regulator_get_voltage(rdev);
911 if (current_uV < 0) {
912 rdev_err(rdev,
913 "failed to get the current voltage(%d)\n",
914 current_uV);
915 return current_uV;
916 }
917 if (current_uV < rdev->constraints->min_uV ||
918 current_uV > rdev->constraints->max_uV) {
919 ret = _regulator_do_set_voltage(
920 rdev, rdev->constraints->min_uV,
921 rdev->constraints->max_uV);
922 if (ret < 0) {
923 rdev_err(rdev,
924 "failed to apply %duV constraint(%d)\n",
925 rdev->constraints->min_uV, ret);
926 return ret;
927 }
928 }
929 }
930
931 /* constrain machine-level voltage specs to fit
932 * the actual range supported by this regulator.
933 */
934 if (ops->list_voltage && rdev->desc->n_voltages) {
935 int count = rdev->desc->n_voltages;
936 int i;
937 int min_uV = INT_MAX;
938 int max_uV = INT_MIN;
939 int cmin = constraints->min_uV;
940 int cmax = constraints->max_uV;
941
942 /* it's safe to autoconfigure fixed-voltage supplies
943 and the constraints are used by list_voltage. */
944 if (count == 1 && !cmin) {
945 cmin = 1;
946 cmax = INT_MAX;
947 constraints->min_uV = cmin;
948 constraints->max_uV = cmax;
949 }
950
951 /* voltage constraints are optional */
952 if ((cmin == 0) && (cmax == 0))
953 return 0;
954
955 /* else require explicit machine-level constraints */
956 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
957 rdev_err(rdev, "invalid voltage constraints\n");
958 return -EINVAL;
959 }
960
961 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
962 for (i = 0; i < count; i++) {
963 int value;
964
965 value = ops->list_voltage(rdev, i);
966 if (value <= 0)
967 continue;
968
969 /* maybe adjust [min_uV..max_uV] */
970 if (value >= cmin && value < min_uV)
971 min_uV = value;
972 if (value <= cmax && value > max_uV)
973 max_uV = value;
974 }
975
976 /* final: [min_uV..max_uV] valid iff constraints valid */
977 if (max_uV < min_uV) {
978 rdev_err(rdev,
979 "unsupportable voltage constraints %u-%uuV\n",
980 min_uV, max_uV);
981 return -EINVAL;
982 }
983
984 /* use regulator's subset of machine constraints */
985 if (constraints->min_uV < min_uV) {
986 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
987 constraints->min_uV, min_uV);
988 constraints->min_uV = min_uV;
989 }
990 if (constraints->max_uV > max_uV) {
991 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
992 constraints->max_uV, max_uV);
993 constraints->max_uV = max_uV;
994 }
995 }
996
997 return 0;
998}
999
1000static int machine_constraints_current(struct regulator_dev *rdev,
1001 struct regulation_constraints *constraints)
1002{
1003 const struct regulator_ops *ops = rdev->desc->ops;
1004 int ret;
1005
1006 if (!constraints->min_uA && !constraints->max_uA)
1007 return 0;
1008
1009 if (constraints->min_uA > constraints->max_uA) {
1010 rdev_err(rdev, "Invalid current constraints\n");
1011 return -EINVAL;
1012 }
1013
1014 if (!ops->set_current_limit || !ops->get_current_limit) {
1015 rdev_warn(rdev, "Operation of current configuration missing\n");
1016 return 0;
1017 }
1018
1019 /* Set regulator current in constraints range */
1020 ret = ops->set_current_limit(rdev, constraints->min_uA,
1021 constraints->max_uA);
1022 if (ret < 0) {
1023 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1024 return ret;
1025 }
1026
1027 return 0;
1028}
1029
1030static int _regulator_do_enable(struct regulator_dev *rdev);
1031
1032/**
1033 * set_machine_constraints - sets regulator constraints
1034 * @rdev: regulator source
1035 * @constraints: constraints to apply
1036 *
1037 * Allows platform initialisation code to define and constrain
1038 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1039 * Constraints *must* be set by platform code in order for some
1040 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1041 * set_mode.
1042 */
1043static int set_machine_constraints(struct regulator_dev *rdev,
1044 const struct regulation_constraints *constraints)
1045{
1046 int ret = 0;
1047 const struct regulator_ops *ops = rdev->desc->ops;
1048
1049 if (constraints)
1050 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1051 GFP_KERNEL);
1052 else
1053 rdev->constraints = kzalloc(sizeof(*constraints),
1054 GFP_KERNEL);
1055 if (!rdev->constraints)
1056 return -ENOMEM;
1057
1058 ret = machine_constraints_voltage(rdev, rdev->constraints);
1059 if (ret != 0)
1060 return ret;
1061
1062 ret = machine_constraints_current(rdev, rdev->constraints);
1063 if (ret != 0)
1064 return ret;
1065
1066 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1067 ret = ops->set_input_current_limit(rdev,
1068 rdev->constraints->ilim_uA);
1069 if (ret < 0) {
1070 rdev_err(rdev, "failed to set input limit\n");
1071 return ret;
1072 }
1073 }
1074
1075 /* do we need to setup our suspend state */
1076 if (rdev->constraints->initial_state) {
1077 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1078 if (ret < 0) {
1079 rdev_err(rdev, "failed to set suspend state\n");
1080 return ret;
1081 }
1082 }
1083
1084 if (rdev->constraints->initial_mode) {
1085 if (!ops->set_mode) {
1086 rdev_err(rdev, "no set_mode operation\n");
1087 return -EINVAL;
1088 }
1089
1090 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1091 if (ret < 0) {
1092 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1093 return ret;
1094 }
1095 }
1096
1097 /* If the constraints say the regulator should be on at this point
1098 * and we have control then make sure it is enabled.
1099 */
1100 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1101 ret = _regulator_do_enable(rdev);
1102 if (ret < 0 && ret != -EINVAL) {
1103 rdev_err(rdev, "failed to enable\n");
1104 return ret;
1105 }
1106 }
1107
1108 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1109 && ops->set_ramp_delay) {
1110 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1111 if (ret < 0) {
1112 rdev_err(rdev, "failed to set ramp_delay\n");
1113 return ret;
1114 }
1115 }
1116
1117 if (rdev->constraints->pull_down && ops->set_pull_down) {
1118 ret = ops->set_pull_down(rdev);
1119 if (ret < 0) {
1120 rdev_err(rdev, "failed to set pull down\n");
1121 return ret;
1122 }
1123 }
1124
1125 if (rdev->constraints->soft_start && ops->set_soft_start) {
1126 ret = ops->set_soft_start(rdev);
1127 if (ret < 0) {
1128 rdev_err(rdev, "failed to set soft start\n");
1129 return ret;
1130 }
1131 }
1132
1133 if (rdev->constraints->over_current_protection
1134 && ops->set_over_current_protection) {
1135 ret = ops->set_over_current_protection(rdev);
1136 if (ret < 0) {
1137 rdev_err(rdev, "failed to set over current protection\n");
1138 return ret;
1139 }
1140 }
1141
1142 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1143 bool ad_state = (rdev->constraints->active_discharge ==
1144 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1145
1146 ret = ops->set_active_discharge(rdev, ad_state);
1147 if (ret < 0) {
1148 rdev_err(rdev, "failed to set active discharge\n");
1149 return ret;
1150 }
1151 }
1152
1153 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1154 bool ad_state = (rdev->constraints->active_discharge ==
1155 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1156
1157 ret = ops->set_active_discharge(rdev, ad_state);
1158 if (ret < 0) {
1159 rdev_err(rdev, "failed to set active discharge\n");
1160 return ret;
1161 }
1162 }
1163
1164 print_constraints(rdev);
1165 return 0;
1166}
1167
1168/**
1169 * set_supply - set regulator supply regulator
1170 * @rdev: regulator name
1171 * @supply_rdev: supply regulator name
1172 *
1173 * Called by platform initialisation code to set the supply regulator for this
1174 * regulator. This ensures that a regulators supply will also be enabled by the
1175 * core if it's child is enabled.
1176 */
1177static int set_supply(struct regulator_dev *rdev,
1178 struct regulator_dev *supply_rdev)
1179{
1180 int err;
1181
1182 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1183
1184 if (!try_module_get(supply_rdev->owner))
1185 return -ENODEV;
1186
1187 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1188 if (rdev->supply == NULL) {
1189 err = -ENOMEM;
1190 return err;
1191 }
1192 supply_rdev->open_count++;
1193
1194 return 0;
1195}
1196
1197/**
1198 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1199 * @rdev: regulator source
1200 * @consumer_dev_name: dev_name() string for device supply applies to
1201 * @supply: symbolic name for supply
1202 *
1203 * Allows platform initialisation code to map physical regulator
1204 * sources to symbolic names for supplies for use by devices. Devices
1205 * should use these symbolic names to request regulators, avoiding the
1206 * need to provide board-specific regulator names as platform data.
1207 */
1208static int set_consumer_device_supply(struct regulator_dev *rdev,
1209 const char *consumer_dev_name,
1210 const char *supply)
1211{
1212 struct regulator_map *node;
1213 int has_dev;
1214
1215 if (supply == NULL)
1216 return -EINVAL;
1217
1218 if (consumer_dev_name != NULL)
1219 has_dev = 1;
1220 else
1221 has_dev = 0;
1222
1223 list_for_each_entry(node, ®ulator_map_list, list) {
1224 if (node->dev_name && consumer_dev_name) {
1225 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1226 continue;
1227 } else if (node->dev_name || consumer_dev_name) {
1228 continue;
1229 }
1230
1231 if (strcmp(node->supply, supply) != 0)
1232 continue;
1233
1234 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1235 consumer_dev_name,
1236 dev_name(&node->regulator->dev),
1237 node->regulator->desc->name,
1238 supply,
1239 dev_name(&rdev->dev), rdev_get_name(rdev));
1240 return -EBUSY;
1241 }
1242
1243 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1244 if (node == NULL)
1245 return -ENOMEM;
1246
1247 node->regulator = rdev;
1248 node->supply = supply;
1249
1250 if (has_dev) {
1251 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1252 if (node->dev_name == NULL) {
1253 kfree(node);
1254 return -ENOMEM;
1255 }
1256 }
1257
1258 list_add(&node->list, ®ulator_map_list);
1259 return 0;
1260}
1261
1262static void unset_regulator_supplies(struct regulator_dev *rdev)
1263{
1264 struct regulator_map *node, *n;
1265
1266 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1267 if (rdev == node->regulator) {
1268 list_del(&node->list);
1269 kfree(node->dev_name);
1270 kfree(node);
1271 }
1272 }
1273}
1274
1275#define REG_STR_SIZE 64
1276
1277static struct regulator *create_regulator(struct regulator_dev *rdev,
1278 struct device *dev,
1279 const char *supply_name)
1280{
1281 struct regulator *regulator;
1282 char buf[REG_STR_SIZE];
1283 int err, size;
1284
1285 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1286 if (regulator == NULL)
1287 return NULL;
1288
1289 mutex_lock(&rdev->mutex);
1290 regulator->rdev = rdev;
1291 list_add(®ulator->list, &rdev->consumer_list);
1292
1293 if (dev) {
1294 regulator->dev = dev;
1295
1296 /* Add a link to the device sysfs entry */
1297 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1298 dev->kobj.name, supply_name);
1299 if (size >= REG_STR_SIZE)
1300 goto overflow_err;
1301
1302 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1303 if (regulator->supply_name == NULL)
1304 goto overflow_err;
1305
1306 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1307 buf);
1308 if (err) {
1309 rdev_dbg(rdev, "could not add device link %s err %d\n",
1310 dev->kobj.name, err);
1311 /* non-fatal */
1312 }
1313 } else {
1314 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1315 if (regulator->supply_name == NULL)
1316 goto overflow_err;
1317 }
1318
1319 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1320 rdev->debugfs);
1321 if (!regulator->debugfs) {
1322 rdev_dbg(rdev, "Failed to create debugfs directory\n");
1323 } else {
1324 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1325 ®ulator->uA_load);
1326 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1327 ®ulator->min_uV);
1328 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1329 ®ulator->max_uV);
1330 }
1331
1332 /*
1333 * Check now if the regulator is an always on regulator - if
1334 * it is then we don't need to do nearly so much work for
1335 * enable/disable calls.
1336 */
1337 if (!_regulator_can_change_status(rdev) &&
1338 _regulator_is_enabled(rdev))
1339 regulator->always_on = true;
1340
1341 mutex_unlock(&rdev->mutex);
1342 return regulator;
1343overflow_err:
1344 list_del(®ulator->list);
1345 kfree(regulator);
1346 mutex_unlock(&rdev->mutex);
1347 return NULL;
1348}
1349
1350static int _regulator_get_enable_time(struct regulator_dev *rdev)
1351{
1352 if (rdev->constraints && rdev->constraints->enable_time)
1353 return rdev->constraints->enable_time;
1354 if (!rdev->desc->ops->enable_time)
1355 return rdev->desc->enable_time;
1356 return rdev->desc->ops->enable_time(rdev);
1357}
1358
1359static struct regulator_supply_alias *regulator_find_supply_alias(
1360 struct device *dev, const char *supply)
1361{
1362 struct regulator_supply_alias *map;
1363
1364 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1365 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1366 return map;
1367
1368 return NULL;
1369}
1370
1371static void regulator_supply_alias(struct device **dev, const char **supply)
1372{
1373 struct regulator_supply_alias *map;
1374
1375 map = regulator_find_supply_alias(*dev, *supply);
1376 if (map) {
1377 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1378 *supply, map->alias_supply,
1379 dev_name(map->alias_dev));
1380 *dev = map->alias_dev;
1381 *supply = map->alias_supply;
1382 }
1383}
1384
1385static int of_node_match(struct device *dev, const void *data)
1386{
1387 return dev->of_node == data;
1388}
1389
1390static struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
1391{
1392 struct device *dev;
1393
1394 dev = class_find_device(®ulator_class, NULL, np, of_node_match);
1395
1396 return dev ? dev_to_rdev(dev) : NULL;
1397}
1398
1399static int regulator_match(struct device *dev, const void *data)
1400{
1401 struct regulator_dev *r = dev_to_rdev(dev);
1402
1403 return strcmp(rdev_get_name(r), data) == 0;
1404}
1405
1406static struct regulator_dev *regulator_lookup_by_name(const char *name)
1407{
1408 struct device *dev;
1409
1410 dev = class_find_device(®ulator_class, NULL, name, regulator_match);
1411
1412 return dev ? dev_to_rdev(dev) : NULL;
1413}
1414
1415/**
1416 * regulator_dev_lookup - lookup a regulator device.
1417 * @dev: device for regulator "consumer".
1418 * @supply: Supply name or regulator ID.
1419 * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if
1420 * lookup could succeed in the future.
1421 *
1422 * If successful, returns a struct regulator_dev that corresponds to the name
1423 * @supply and with the embedded struct device refcount incremented by one,
1424 * or NULL on failure. The refcount must be dropped by calling put_device().
1425 */
1426static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1427 const char *supply,
1428 int *ret)
1429{
1430 struct regulator_dev *r;
1431 struct device_node *node;
1432 struct regulator_map *map;
1433 const char *devname = NULL;
1434
1435 regulator_supply_alias(&dev, &supply);
1436
1437 /* first do a dt based lookup */
1438 if (dev && dev->of_node) {
1439 node = of_get_regulator(dev, supply);
1440 if (node) {
1441 r = of_find_regulator_by_node(node);
1442 if (r)
1443 return r;
1444 *ret = -EPROBE_DEFER;
1445 return NULL;
1446 } else {
1447 /*
1448 * If we couldn't even get the node then it's
1449 * not just that the device didn't register
1450 * yet, there's no node and we'll never
1451 * succeed.
1452 */
1453 *ret = -ENODEV;
1454 }
1455 }
1456
1457 /* if not found, try doing it non-dt way */
1458 if (dev)
1459 devname = dev_name(dev);
1460
1461 r = regulator_lookup_by_name(supply);
1462 if (r)
1463 return r;
1464
1465 mutex_lock(®ulator_list_mutex);
1466 list_for_each_entry(map, ®ulator_map_list, list) {
1467 /* If the mapping has a device set up it must match */
1468 if (map->dev_name &&
1469 (!devname || strcmp(map->dev_name, devname)))
1470 continue;
1471
1472 if (strcmp(map->supply, supply) == 0 &&
1473 get_device(&map->regulator->dev)) {
1474 mutex_unlock(®ulator_list_mutex);
1475 return map->regulator;
1476 }
1477 }
1478 mutex_unlock(®ulator_list_mutex);
1479
1480 return NULL;
1481}
1482
1483static int regulator_resolve_supply(struct regulator_dev *rdev)
1484{
1485 struct regulator_dev *r;
1486 struct device *dev = rdev->dev.parent;
1487 int ret;
1488
1489 /* No supply to resovle? */
1490 if (!rdev->supply_name)
1491 return 0;
1492
1493 /* Supply already resolved? */
1494 if (rdev->supply)
1495 return 0;
1496
1497 r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
1498 if (!r) {
1499 if (ret == -ENODEV) {
1500 /*
1501 * No supply was specified for this regulator and
1502 * there will never be one.
1503 */
1504 return 0;
1505 }
1506
1507 /* Did the lookup explicitly defer for us? */
1508 if (ret == -EPROBE_DEFER)
1509 return ret;
1510
1511 if (have_full_constraints()) {
1512 r = dummy_regulator_rdev;
1513 get_device(&r->dev);
1514 } else {
1515 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1516 rdev->supply_name, rdev->desc->name);
1517 return -EPROBE_DEFER;
1518 }
1519 }
1520
1521 /* Recursively resolve the supply of the supply */
1522 ret = regulator_resolve_supply(r);
1523 if (ret < 0) {
1524 put_device(&r->dev);
1525 return ret;
1526 }
1527
1528 ret = set_supply(rdev, r);
1529 if (ret < 0) {
1530 put_device(&r->dev);
1531 return ret;
1532 }
1533
1534 /* Cascade always-on state to supply */
1535 if (_regulator_is_enabled(rdev) && rdev->supply) {
1536 ret = regulator_enable(rdev->supply);
1537 if (ret < 0) {
1538 _regulator_put(rdev->supply);
1539 return ret;
1540 }
1541 }
1542
1543 return 0;
1544}
1545
1546/* Internal regulator request function */
1547static struct regulator *_regulator_get(struct device *dev, const char *id,
1548 bool exclusive, bool allow_dummy)
1549{
1550 struct regulator_dev *rdev;
1551 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1552 const char *devname = NULL;
1553 int ret;
1554
1555 if (id == NULL) {
1556 pr_err("get() with no identifier\n");
1557 return ERR_PTR(-EINVAL);
1558 }
1559
1560 if (dev)
1561 devname = dev_name(dev);
1562
1563 if (have_full_constraints())
1564 ret = -ENODEV;
1565 else
1566 ret = -EPROBE_DEFER;
1567
1568 rdev = regulator_dev_lookup(dev, id, &ret);
1569 if (rdev)
1570 goto found;
1571
1572 regulator = ERR_PTR(ret);
1573
1574 /*
1575 * If we have return value from dev_lookup fail, we do not expect to
1576 * succeed, so, quit with appropriate error value
1577 */
1578 if (ret && ret != -ENODEV)
1579 return regulator;
1580
1581 if (!devname)
1582 devname = "deviceless";
1583
1584 /*
1585 * Assume that a regulator is physically present and enabled
1586 * even if it isn't hooked up and just provide a dummy.
1587 */
1588 if (have_full_constraints() && allow_dummy) {
1589 pr_warn("%s supply %s not found, using dummy regulator\n",
1590 devname, id);
1591
1592 rdev = dummy_regulator_rdev;
1593 get_device(&rdev->dev);
1594 goto found;
1595 /* Don't log an error when called from regulator_get_optional() */
1596 } else if (!have_full_constraints() || exclusive) {
1597 dev_warn(dev, "dummy supplies not allowed\n");
1598 }
1599
1600 return regulator;
1601
1602found:
1603 if (rdev->exclusive) {
1604 regulator = ERR_PTR(-EPERM);
1605 put_device(&rdev->dev);
1606 return regulator;
1607 }
1608
1609 if (exclusive && rdev->open_count) {
1610 regulator = ERR_PTR(-EBUSY);
1611 put_device(&rdev->dev);
1612 return regulator;
1613 }
1614
1615 ret = regulator_resolve_supply(rdev);
1616 if (ret < 0) {
1617 regulator = ERR_PTR(ret);
1618 put_device(&rdev->dev);
1619 return regulator;
1620 }
1621
1622 if (!try_module_get(rdev->owner)) {
1623 put_device(&rdev->dev);
1624 return regulator;
1625 }
1626
1627 regulator = create_regulator(rdev, dev, id);
1628 if (regulator == NULL) {
1629 regulator = ERR_PTR(-ENOMEM);
1630 put_device(&rdev->dev);
1631 module_put(rdev->owner);
1632 return regulator;
1633 }
1634
1635 rdev->open_count++;
1636 if (exclusive) {
1637 rdev->exclusive = 1;
1638
1639 ret = _regulator_is_enabled(rdev);
1640 if (ret > 0)
1641 rdev->use_count = 1;
1642 else
1643 rdev->use_count = 0;
1644 }
1645
1646 return regulator;
1647}
1648
1649/**
1650 * regulator_get - lookup and obtain a reference to a regulator.
1651 * @dev: device for regulator "consumer"
1652 * @id: Supply name or regulator ID.
1653 *
1654 * Returns a struct regulator corresponding to the regulator producer,
1655 * or IS_ERR() condition containing errno.
1656 *
1657 * Use of supply names configured via regulator_set_device_supply() is
1658 * strongly encouraged. It is recommended that the supply name used
1659 * should match the name used for the supply and/or the relevant
1660 * device pins in the datasheet.
1661 */
1662struct regulator *regulator_get(struct device *dev, const char *id)
1663{
1664 return _regulator_get(dev, id, false, true);
1665}
1666EXPORT_SYMBOL_GPL(regulator_get);
1667
1668/**
1669 * regulator_get_exclusive - obtain exclusive access to a regulator.
1670 * @dev: device for regulator "consumer"
1671 * @id: Supply name or regulator ID.
1672 *
1673 * Returns a struct regulator corresponding to the regulator producer,
1674 * or IS_ERR() condition containing errno. Other consumers will be
1675 * unable to obtain this regulator while this reference is held and the
1676 * use count for the regulator will be initialised to reflect the current
1677 * state of the regulator.
1678 *
1679 * This is intended for use by consumers which cannot tolerate shared
1680 * use of the regulator such as those which need to force the
1681 * regulator off for correct operation of the hardware they are
1682 * controlling.
1683 *
1684 * Use of supply names configured via regulator_set_device_supply() is
1685 * strongly encouraged. It is recommended that the supply name used
1686 * should match the name used for the supply and/or the relevant
1687 * device pins in the datasheet.
1688 */
1689struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1690{
1691 return _regulator_get(dev, id, true, false);
1692}
1693EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1694
1695/**
1696 * regulator_get_optional - obtain optional access to a regulator.
1697 * @dev: device for regulator "consumer"
1698 * @id: Supply name or regulator ID.
1699 *
1700 * Returns a struct regulator corresponding to the regulator producer,
1701 * or IS_ERR() condition containing errno.
1702 *
1703 * This is intended for use by consumers for devices which can have
1704 * some supplies unconnected in normal use, such as some MMC devices.
1705 * It can allow the regulator core to provide stub supplies for other
1706 * supplies requested using normal regulator_get() calls without
1707 * disrupting the operation of drivers that can handle absent
1708 * supplies.
1709 *
1710 * Use of supply names configured via regulator_set_device_supply() is
1711 * strongly encouraged. It is recommended that the supply name used
1712 * should match the name used for the supply and/or the relevant
1713 * device pins in the datasheet.
1714 */
1715struct regulator *regulator_get_optional(struct device *dev, const char *id)
1716{
1717 return _regulator_get(dev, id, false, false);
1718}
1719EXPORT_SYMBOL_GPL(regulator_get_optional);
1720
1721/* regulator_list_mutex lock held by regulator_put() */
1722static void _regulator_put(struct regulator *regulator)
1723{
1724 struct regulator_dev *rdev;
1725
1726 if (IS_ERR_OR_NULL(regulator))
1727 return;
1728
1729 lockdep_assert_held_once(®ulator_list_mutex);
1730
1731 rdev = regulator->rdev;
1732
1733 debugfs_remove_recursive(regulator->debugfs);
1734
1735 /* remove any sysfs entries */
1736 if (regulator->dev)
1737 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1738 mutex_lock(&rdev->mutex);
1739 list_del(®ulator->list);
1740
1741 rdev->open_count--;
1742 rdev->exclusive = 0;
1743 put_device(&rdev->dev);
1744 mutex_unlock(&rdev->mutex);
1745
1746 kfree(regulator->supply_name);
1747 kfree(regulator);
1748
1749 module_put(rdev->owner);
1750}
1751
1752/**
1753 * regulator_put - "free" the regulator source
1754 * @regulator: regulator source
1755 *
1756 * Note: drivers must ensure that all regulator_enable calls made on this
1757 * regulator source are balanced by regulator_disable calls prior to calling
1758 * this function.
1759 */
1760void regulator_put(struct regulator *regulator)
1761{
1762 mutex_lock(®ulator_list_mutex);
1763 _regulator_put(regulator);
1764 mutex_unlock(®ulator_list_mutex);
1765}
1766EXPORT_SYMBOL_GPL(regulator_put);
1767
1768/**
1769 * regulator_register_supply_alias - Provide device alias for supply lookup
1770 *
1771 * @dev: device that will be given as the regulator "consumer"
1772 * @id: Supply name or regulator ID
1773 * @alias_dev: device that should be used to lookup the supply
1774 * @alias_id: Supply name or regulator ID that should be used to lookup the
1775 * supply
1776 *
1777 * All lookups for id on dev will instead be conducted for alias_id on
1778 * alias_dev.
1779 */
1780int regulator_register_supply_alias(struct device *dev, const char *id,
1781 struct device *alias_dev,
1782 const char *alias_id)
1783{
1784 struct regulator_supply_alias *map;
1785
1786 map = regulator_find_supply_alias(dev, id);
1787 if (map)
1788 return -EEXIST;
1789
1790 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1791 if (!map)
1792 return -ENOMEM;
1793
1794 map->src_dev = dev;
1795 map->src_supply = id;
1796 map->alias_dev = alias_dev;
1797 map->alias_supply = alias_id;
1798
1799 list_add(&map->list, ®ulator_supply_alias_list);
1800
1801 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1802 id, dev_name(dev), alias_id, dev_name(alias_dev));
1803
1804 return 0;
1805}
1806EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1807
1808/**
1809 * regulator_unregister_supply_alias - Remove device alias
1810 *
1811 * @dev: device that will be given as the regulator "consumer"
1812 * @id: Supply name or regulator ID
1813 *
1814 * Remove a lookup alias if one exists for id on dev.
1815 */
1816void regulator_unregister_supply_alias(struct device *dev, const char *id)
1817{
1818 struct regulator_supply_alias *map;
1819
1820 map = regulator_find_supply_alias(dev, id);
1821 if (map) {
1822 list_del(&map->list);
1823 kfree(map);
1824 }
1825}
1826EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1827
1828/**
1829 * regulator_bulk_register_supply_alias - register multiple aliases
1830 *
1831 * @dev: device that will be given as the regulator "consumer"
1832 * @id: List of supply names or regulator IDs
1833 * @alias_dev: device that should be used to lookup the supply
1834 * @alias_id: List of supply names or regulator IDs that should be used to
1835 * lookup the supply
1836 * @num_id: Number of aliases to register
1837 *
1838 * @return 0 on success, an errno on failure.
1839 *
1840 * This helper function allows drivers to register several supply
1841 * aliases in one operation. If any of the aliases cannot be
1842 * registered any aliases that were registered will be removed
1843 * before returning to the caller.
1844 */
1845int regulator_bulk_register_supply_alias(struct device *dev,
1846 const char *const *id,
1847 struct device *alias_dev,
1848 const char *const *alias_id,
1849 int num_id)
1850{
1851 int i;
1852 int ret;
1853
1854 for (i = 0; i < num_id; ++i) {
1855 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1856 alias_id[i]);
1857 if (ret < 0)
1858 goto err;
1859 }
1860
1861 return 0;
1862
1863err:
1864 dev_err(dev,
1865 "Failed to create supply alias %s,%s -> %s,%s\n",
1866 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1867
1868 while (--i >= 0)
1869 regulator_unregister_supply_alias(dev, id[i]);
1870
1871 return ret;
1872}
1873EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1874
1875/**
1876 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1877 *
1878 * @dev: device that will be given as the regulator "consumer"
1879 * @id: List of supply names or regulator IDs
1880 * @num_id: Number of aliases to unregister
1881 *
1882 * This helper function allows drivers to unregister several supply
1883 * aliases in one operation.
1884 */
1885void regulator_bulk_unregister_supply_alias(struct device *dev,
1886 const char *const *id,
1887 int num_id)
1888{
1889 int i;
1890
1891 for (i = 0; i < num_id; ++i)
1892 regulator_unregister_supply_alias(dev, id[i]);
1893}
1894EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1895
1896
1897/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1898static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1899 const struct regulator_config *config)
1900{
1901 struct regulator_enable_gpio *pin;
1902 struct gpio_desc *gpiod;
1903 int ret;
1904
1905 gpiod = gpio_to_desc(config->ena_gpio);
1906
1907 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1908 if (pin->gpiod == gpiod) {
1909 rdev_dbg(rdev, "GPIO %d is already used\n",
1910 config->ena_gpio);
1911 goto update_ena_gpio_to_rdev;
1912 }
1913 }
1914
1915 ret = gpio_request_one(config->ena_gpio,
1916 GPIOF_DIR_OUT | config->ena_gpio_flags,
1917 rdev_get_name(rdev));
1918 if (ret)
1919 return ret;
1920
1921 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1922 if (pin == NULL) {
1923 gpio_free(config->ena_gpio);
1924 return -ENOMEM;
1925 }
1926
1927 pin->gpiod = gpiod;
1928 pin->ena_gpio_invert = config->ena_gpio_invert;
1929 list_add(&pin->list, ®ulator_ena_gpio_list);
1930
1931update_ena_gpio_to_rdev:
1932 pin->request_count++;
1933 rdev->ena_pin = pin;
1934 return 0;
1935}
1936
1937static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1938{
1939 struct regulator_enable_gpio *pin, *n;
1940
1941 if (!rdev->ena_pin)
1942 return;
1943
1944 /* Free the GPIO only in case of no use */
1945 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
1946 if (pin->gpiod == rdev->ena_pin->gpiod) {
1947 if (pin->request_count <= 1) {
1948 pin->request_count = 0;
1949 gpiod_put(pin->gpiod);
1950 list_del(&pin->list);
1951 kfree(pin);
1952 rdev->ena_pin = NULL;
1953 return;
1954 } else {
1955 pin->request_count--;
1956 }
1957 }
1958 }
1959}
1960
1961/**
1962 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1963 * @rdev: regulator_dev structure
1964 * @enable: enable GPIO at initial use?
1965 *
1966 * GPIO is enabled in case of initial use. (enable_count is 0)
1967 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1968 */
1969static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1970{
1971 struct regulator_enable_gpio *pin = rdev->ena_pin;
1972
1973 if (!pin)
1974 return -EINVAL;
1975
1976 if (enable) {
1977 /* Enable GPIO at initial use */
1978 if (pin->enable_count == 0)
1979 gpiod_set_value_cansleep(pin->gpiod,
1980 !pin->ena_gpio_invert);
1981
1982 pin->enable_count++;
1983 } else {
1984 if (pin->enable_count > 1) {
1985 pin->enable_count--;
1986 return 0;
1987 }
1988
1989 /* Disable GPIO if not used */
1990 if (pin->enable_count <= 1) {
1991 gpiod_set_value_cansleep(pin->gpiod,
1992 pin->ena_gpio_invert);
1993 pin->enable_count = 0;
1994 }
1995 }
1996
1997 return 0;
1998}
1999
2000/**
2001 * _regulator_enable_delay - a delay helper function
2002 * @delay: time to delay in microseconds
2003 *
2004 * Delay for the requested amount of time as per the guidelines in:
2005 *
2006 * Documentation/timers/timers-howto.txt
2007 *
2008 * The assumption here is that regulators will never be enabled in
2009 * atomic context and therefore sleeping functions can be used.
2010 */
2011static void _regulator_enable_delay(unsigned int delay)
2012{
2013 unsigned int ms = delay / 1000;
2014 unsigned int us = delay % 1000;
2015
2016 if (ms > 0) {
2017 /*
2018 * For small enough values, handle super-millisecond
2019 * delays in the usleep_range() call below.
2020 */
2021 if (ms < 20)
2022 us += ms * 1000;
2023 else
2024 msleep(ms);
2025 }
2026
2027 /*
2028 * Give the scheduler some room to coalesce with any other
2029 * wakeup sources. For delays shorter than 10 us, don't even
2030 * bother setting up high-resolution timers and just busy-
2031 * loop.
2032 */
2033 if (us >= 10)
2034 usleep_range(us, us + 100);
2035 else
2036 udelay(us);
2037}
2038
2039static int _regulator_do_enable(struct regulator_dev *rdev)
2040{
2041 int ret, delay;
2042
2043 /* Query before enabling in case configuration dependent. */
2044 ret = _regulator_get_enable_time(rdev);
2045 if (ret >= 0) {
2046 delay = ret;
2047 } else {
2048 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2049 delay = 0;
2050 }
2051
2052 trace_regulator_enable(rdev_get_name(rdev));
2053
2054 if (rdev->desc->off_on_delay) {
2055 /* if needed, keep a distance of off_on_delay from last time
2056 * this regulator was disabled.
2057 */
2058 unsigned long start_jiffy = jiffies;
2059 unsigned long intended, max_delay, remaining;
2060
2061 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2062 intended = rdev->last_off_jiffy + max_delay;
2063
2064 if (time_before(start_jiffy, intended)) {
2065 /* calc remaining jiffies to deal with one-time
2066 * timer wrapping.
2067 * in case of multiple timer wrapping, either it can be
2068 * detected by out-of-range remaining, or it cannot be
2069 * detected and we gets a panelty of
2070 * _regulator_enable_delay().
2071 */
2072 remaining = intended - start_jiffy;
2073 if (remaining <= max_delay)
2074 _regulator_enable_delay(
2075 jiffies_to_usecs(remaining));
2076 }
2077 }
2078
2079 if (rdev->ena_pin) {
2080 if (!rdev->ena_gpio_state) {
2081 ret = regulator_ena_gpio_ctrl(rdev, true);
2082 if (ret < 0)
2083 return ret;
2084 rdev->ena_gpio_state = 1;
2085 }
2086 } else if (rdev->desc->ops->enable) {
2087 ret = rdev->desc->ops->enable(rdev);
2088 if (ret < 0)
2089 return ret;
2090 } else {
2091 return -EINVAL;
2092 }
2093
2094 /* Allow the regulator to ramp; it would be useful to extend
2095 * this for bulk operations so that the regulators can ramp
2096 * together. */
2097 trace_regulator_enable_delay(rdev_get_name(rdev));
2098
2099 _regulator_enable_delay(delay);
2100
2101 trace_regulator_enable_complete(rdev_get_name(rdev));
2102
2103 return 0;
2104}
2105
2106/* locks held by regulator_enable() */
2107static int _regulator_enable(struct regulator_dev *rdev)
2108{
2109 int ret;
2110
2111 lockdep_assert_held_once(&rdev->mutex);
2112
2113 /* check voltage and requested load before enabling */
2114 if (rdev->constraints &&
2115 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
2116 drms_uA_update(rdev);
2117
2118 if (rdev->use_count == 0) {
2119 /* The regulator may on if it's not switchable or left on */
2120 ret = _regulator_is_enabled(rdev);
2121 if (ret == -EINVAL || ret == 0) {
2122 if (!_regulator_can_change_status(rdev))
2123 return -EPERM;
2124
2125 ret = _regulator_do_enable(rdev);
2126 if (ret < 0)
2127 return ret;
2128
2129 } else if (ret < 0) {
2130 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
2131 return ret;
2132 }
2133 /* Fallthrough on positive return values - already enabled */
2134 }
2135
2136 rdev->use_count++;
2137
2138 return 0;
2139}
2140
2141/**
2142 * regulator_enable - enable regulator output
2143 * @regulator: regulator source
2144 *
2145 * Request that the regulator be enabled with the regulator output at
2146 * the predefined voltage or current value. Calls to regulator_enable()
2147 * must be balanced with calls to regulator_disable().
2148 *
2149 * NOTE: the output value can be set by other drivers, boot loader or may be
2150 * hardwired in the regulator.
2151 */
2152int regulator_enable(struct regulator *regulator)
2153{
2154 struct regulator_dev *rdev = regulator->rdev;
2155 int ret = 0;
2156
2157 if (regulator->always_on)
2158 return 0;
2159
2160 if (rdev->supply) {
2161 ret = regulator_enable(rdev->supply);
2162 if (ret != 0)
2163 return ret;
2164 }
2165
2166 mutex_lock(&rdev->mutex);
2167 ret = _regulator_enable(rdev);
2168 mutex_unlock(&rdev->mutex);
2169
2170 if (ret != 0 && rdev->supply)
2171 regulator_disable(rdev->supply);
2172
2173 return ret;
2174}
2175EXPORT_SYMBOL_GPL(regulator_enable);
2176
2177static int _regulator_do_disable(struct regulator_dev *rdev)
2178{
2179 int ret;
2180
2181 trace_regulator_disable(rdev_get_name(rdev));
2182
2183 if (rdev->ena_pin) {
2184 if (rdev->ena_gpio_state) {
2185 ret = regulator_ena_gpio_ctrl(rdev, false);
2186 if (ret < 0)
2187 return ret;
2188 rdev->ena_gpio_state = 0;
2189 }
2190
2191 } else if (rdev->desc->ops->disable) {
2192 ret = rdev->desc->ops->disable(rdev);
2193 if (ret != 0)
2194 return ret;
2195 }
2196
2197 /* cares about last_off_jiffy only if off_on_delay is required by
2198 * device.
2199 */
2200 if (rdev->desc->off_on_delay)
2201 rdev->last_off_jiffy = jiffies;
2202
2203 trace_regulator_disable_complete(rdev_get_name(rdev));
2204
2205 return 0;
2206}
2207
2208/* locks held by regulator_disable() */
2209static int _regulator_disable(struct regulator_dev *rdev)
2210{
2211 int ret = 0;
2212
2213 lockdep_assert_held_once(&rdev->mutex);
2214
2215 if (WARN(rdev->use_count <= 0,
2216 "unbalanced disables for %s\n", rdev_get_name(rdev)))
2217 return -EIO;
2218
2219 /* are we the last user and permitted to disable ? */
2220 if (rdev->use_count == 1 &&
2221 (rdev->constraints && !rdev->constraints->always_on)) {
2222
2223 /* we are last user */
2224 if (_regulator_can_change_status(rdev)) {
2225 ret = _notifier_call_chain(rdev,
2226 REGULATOR_EVENT_PRE_DISABLE,
2227 NULL);
2228 if (ret & NOTIFY_STOP_MASK)
2229 return -EINVAL;
2230
2231 ret = _regulator_do_disable(rdev);
2232 if (ret < 0) {
2233 rdev_err(rdev, "failed to disable\n");
2234 _notifier_call_chain(rdev,
2235 REGULATOR_EVENT_ABORT_DISABLE,
2236 NULL);
2237 return ret;
2238 }
2239 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2240 NULL);
2241 }
2242
2243 rdev->use_count = 0;
2244 } else if (rdev->use_count > 1) {
2245
2246 if (rdev->constraints &&
2247 (rdev->constraints->valid_ops_mask &
2248 REGULATOR_CHANGE_DRMS))
2249 drms_uA_update(rdev);
2250
2251 rdev->use_count--;
2252 }
2253
2254 return ret;
2255}
2256
2257/**
2258 * regulator_disable - disable regulator output
2259 * @regulator: regulator source
2260 *
2261 * Disable the regulator output voltage or current. Calls to
2262 * regulator_enable() must be balanced with calls to
2263 * regulator_disable().
2264 *
2265 * NOTE: this will only disable the regulator output if no other consumer
2266 * devices have it enabled, the regulator device supports disabling and
2267 * machine constraints permit this operation.
2268 */
2269int regulator_disable(struct regulator *regulator)
2270{
2271 struct regulator_dev *rdev = regulator->rdev;
2272 int ret = 0;
2273
2274 if (regulator->always_on)
2275 return 0;
2276
2277 mutex_lock(&rdev->mutex);
2278 ret = _regulator_disable(rdev);
2279 mutex_unlock(&rdev->mutex);
2280
2281 if (ret == 0 && rdev->supply)
2282 regulator_disable(rdev->supply);
2283
2284 return ret;
2285}
2286EXPORT_SYMBOL_GPL(regulator_disable);
2287
2288/* locks held by regulator_force_disable() */
2289static int _regulator_force_disable(struct regulator_dev *rdev)
2290{
2291 int ret = 0;
2292
2293 lockdep_assert_held_once(&rdev->mutex);
2294
2295 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2296 REGULATOR_EVENT_PRE_DISABLE, NULL);
2297 if (ret & NOTIFY_STOP_MASK)
2298 return -EINVAL;
2299
2300 ret = _regulator_do_disable(rdev);
2301 if (ret < 0) {
2302 rdev_err(rdev, "failed to force disable\n");
2303 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2304 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2305 return ret;
2306 }
2307
2308 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2309 REGULATOR_EVENT_DISABLE, NULL);
2310
2311 return 0;
2312}
2313
2314/**
2315 * regulator_force_disable - force disable regulator output
2316 * @regulator: regulator source
2317 *
2318 * Forcibly disable the regulator output voltage or current.
2319 * NOTE: this *will* disable the regulator output even if other consumer
2320 * devices have it enabled. This should be used for situations when device
2321 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2322 */
2323int regulator_force_disable(struct regulator *regulator)
2324{
2325 struct regulator_dev *rdev = regulator->rdev;
2326 int ret;
2327
2328 mutex_lock(&rdev->mutex);
2329 regulator->uA_load = 0;
2330 ret = _regulator_force_disable(regulator->rdev);
2331 mutex_unlock(&rdev->mutex);
2332
2333 if (rdev->supply)
2334 while (rdev->open_count--)
2335 regulator_disable(rdev->supply);
2336
2337 return ret;
2338}
2339EXPORT_SYMBOL_GPL(regulator_force_disable);
2340
2341static void regulator_disable_work(struct work_struct *work)
2342{
2343 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2344 disable_work.work);
2345 int count, i, ret;
2346
2347 mutex_lock(&rdev->mutex);
2348
2349 BUG_ON(!rdev->deferred_disables);
2350
2351 count = rdev->deferred_disables;
2352 rdev->deferred_disables = 0;
2353
2354 for (i = 0; i < count; i++) {
2355 ret = _regulator_disable(rdev);
2356 if (ret != 0)
2357 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2358 }
2359
2360 mutex_unlock(&rdev->mutex);
2361
2362 if (rdev->supply) {
2363 for (i = 0; i < count; i++) {
2364 ret = regulator_disable(rdev->supply);
2365 if (ret != 0) {
2366 rdev_err(rdev,
2367 "Supply disable failed: %d\n", ret);
2368 }
2369 }
2370 }
2371}
2372
2373/**
2374 * regulator_disable_deferred - disable regulator output with delay
2375 * @regulator: regulator source
2376 * @ms: miliseconds until the regulator is disabled
2377 *
2378 * Execute regulator_disable() on the regulator after a delay. This
2379 * is intended for use with devices that require some time to quiesce.
2380 *
2381 * NOTE: this will only disable the regulator output if no other consumer
2382 * devices have it enabled, the regulator device supports disabling and
2383 * machine constraints permit this operation.
2384 */
2385int regulator_disable_deferred(struct regulator *regulator, int ms)
2386{
2387 struct regulator_dev *rdev = regulator->rdev;
2388
2389 if (regulator->always_on)
2390 return 0;
2391
2392 if (!ms)
2393 return regulator_disable(regulator);
2394
2395 mutex_lock(&rdev->mutex);
2396 rdev->deferred_disables++;
2397 mutex_unlock(&rdev->mutex);
2398
2399 queue_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2400 msecs_to_jiffies(ms));
2401 return 0;
2402}
2403EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2404
2405static int _regulator_is_enabled(struct regulator_dev *rdev)
2406{
2407 /* A GPIO control always takes precedence */
2408 if (rdev->ena_pin)
2409 return rdev->ena_gpio_state;
2410
2411 /* If we don't know then assume that the regulator is always on */
2412 if (!rdev->desc->ops->is_enabled)
2413 return 1;
2414
2415 return rdev->desc->ops->is_enabled(rdev);
2416}
2417
2418static int _regulator_list_voltage(struct regulator *regulator,
2419 unsigned selector, int lock)
2420{
2421 struct regulator_dev *rdev = regulator->rdev;
2422 const struct regulator_ops *ops = rdev->desc->ops;
2423 int ret;
2424
2425 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2426 return rdev->desc->fixed_uV;
2427
2428 if (ops->list_voltage) {
2429 if (selector >= rdev->desc->n_voltages)
2430 return -EINVAL;
2431 if (lock)
2432 mutex_lock(&rdev->mutex);
2433 ret = ops->list_voltage(rdev, selector);
2434 if (lock)
2435 mutex_unlock(&rdev->mutex);
2436 } else if (rdev->supply) {
2437 ret = _regulator_list_voltage(rdev->supply, selector, lock);
2438 } else {
2439 return -EINVAL;
2440 }
2441
2442 if (ret > 0) {
2443 if (ret < rdev->constraints->min_uV)
2444 ret = 0;
2445 else if (ret > rdev->constraints->max_uV)
2446 ret = 0;
2447 }
2448
2449 return ret;
2450}
2451
2452/**
2453 * regulator_is_enabled - is the regulator output enabled
2454 * @regulator: regulator source
2455 *
2456 * Returns positive if the regulator driver backing the source/client
2457 * has requested that the device be enabled, zero if it hasn't, else a
2458 * negative errno code.
2459 *
2460 * Note that the device backing this regulator handle can have multiple
2461 * users, so it might be enabled even if regulator_enable() was never
2462 * called for this particular source.
2463 */
2464int regulator_is_enabled(struct regulator *regulator)
2465{
2466 int ret;
2467
2468 if (regulator->always_on)
2469 return 1;
2470
2471 mutex_lock(®ulator->rdev->mutex);
2472 ret = _regulator_is_enabled(regulator->rdev);
2473 mutex_unlock(®ulator->rdev->mutex);
2474
2475 return ret;
2476}
2477EXPORT_SYMBOL_GPL(regulator_is_enabled);
2478
2479/**
2480 * regulator_can_change_voltage - check if regulator can change voltage
2481 * @regulator: regulator source
2482 *
2483 * Returns positive if the regulator driver backing the source/client
2484 * can change its voltage, false otherwise. Useful for detecting fixed
2485 * or dummy regulators and disabling voltage change logic in the client
2486 * driver.
2487 */
2488int regulator_can_change_voltage(struct regulator *regulator)
2489{
2490 struct regulator_dev *rdev = regulator->rdev;
2491
2492 if (rdev->constraints &&
2493 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2494 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2495 return 1;
2496
2497 if (rdev->desc->continuous_voltage_range &&
2498 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2499 rdev->constraints->min_uV != rdev->constraints->max_uV)
2500 return 1;
2501 }
2502
2503 return 0;
2504}
2505EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2506
2507/**
2508 * regulator_count_voltages - count regulator_list_voltage() selectors
2509 * @regulator: regulator source
2510 *
2511 * Returns number of selectors, or negative errno. Selectors are
2512 * numbered starting at zero, and typically correspond to bitfields
2513 * in hardware registers.
2514 */
2515int regulator_count_voltages(struct regulator *regulator)
2516{
2517 struct regulator_dev *rdev = regulator->rdev;
2518
2519 if (rdev->desc->n_voltages)
2520 return rdev->desc->n_voltages;
2521
2522 if (!rdev->supply)
2523 return -EINVAL;
2524
2525 return regulator_count_voltages(rdev->supply);
2526}
2527EXPORT_SYMBOL_GPL(regulator_count_voltages);
2528
2529/**
2530 * regulator_list_voltage - enumerate supported voltages
2531 * @regulator: regulator source
2532 * @selector: identify voltage to list
2533 * Context: can sleep
2534 *
2535 * Returns a voltage that can be passed to @regulator_set_voltage(),
2536 * zero if this selector code can't be used on this system, or a
2537 * negative errno.
2538 */
2539int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2540{
2541 return _regulator_list_voltage(regulator, selector, 1);
2542}
2543EXPORT_SYMBOL_GPL(regulator_list_voltage);
2544
2545/**
2546 * regulator_get_regmap - get the regulator's register map
2547 * @regulator: regulator source
2548 *
2549 * Returns the register map for the given regulator, or an ERR_PTR value
2550 * if the regulator doesn't use regmap.
2551 */
2552struct regmap *regulator_get_regmap(struct regulator *regulator)
2553{
2554 struct regmap *map = regulator->rdev->regmap;
2555
2556 return map ? map : ERR_PTR(-EOPNOTSUPP);
2557}
2558
2559/**
2560 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2561 * @regulator: regulator source
2562 * @vsel_reg: voltage selector register, output parameter
2563 * @vsel_mask: mask for voltage selector bitfield, output parameter
2564 *
2565 * Returns the hardware register offset and bitmask used for setting the
2566 * regulator voltage. This might be useful when configuring voltage-scaling
2567 * hardware or firmware that can make I2C requests behind the kernel's back,
2568 * for example.
2569 *
2570 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2571 * and 0 is returned, otherwise a negative errno is returned.
2572 */
2573int regulator_get_hardware_vsel_register(struct regulator *regulator,
2574 unsigned *vsel_reg,
2575 unsigned *vsel_mask)
2576{
2577 struct regulator_dev *rdev = regulator->rdev;
2578 const struct regulator_ops *ops = rdev->desc->ops;
2579
2580 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2581 return -EOPNOTSUPP;
2582
2583 *vsel_reg = rdev->desc->vsel_reg;
2584 *vsel_mask = rdev->desc->vsel_mask;
2585
2586 return 0;
2587}
2588EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2589
2590/**
2591 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2592 * @regulator: regulator source
2593 * @selector: identify voltage to list
2594 *
2595 * Converts the selector to a hardware-specific voltage selector that can be
2596 * directly written to the regulator registers. The address of the voltage
2597 * register can be determined by calling @regulator_get_hardware_vsel_register.
2598 *
2599 * On error a negative errno is returned.
2600 */
2601int regulator_list_hardware_vsel(struct regulator *regulator,
2602 unsigned selector)
2603{
2604 struct regulator_dev *rdev = regulator->rdev;
2605 const struct regulator_ops *ops = rdev->desc->ops;
2606
2607 if (selector >= rdev->desc->n_voltages)
2608 return -EINVAL;
2609 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2610 return -EOPNOTSUPP;
2611
2612 return selector;
2613}
2614EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2615
2616/**
2617 * regulator_get_linear_step - return the voltage step size between VSEL values
2618 * @regulator: regulator source
2619 *
2620 * Returns the voltage step size between VSEL values for linear
2621 * regulators, or return 0 if the regulator isn't a linear regulator.
2622 */
2623unsigned int regulator_get_linear_step(struct regulator *regulator)
2624{
2625 struct regulator_dev *rdev = regulator->rdev;
2626
2627 return rdev->desc->uV_step;
2628}
2629EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2630
2631/**
2632 * regulator_is_supported_voltage - check if a voltage range can be supported
2633 *
2634 * @regulator: Regulator to check.
2635 * @min_uV: Minimum required voltage in uV.
2636 * @max_uV: Maximum required voltage in uV.
2637 *
2638 * Returns a boolean or a negative error code.
2639 */
2640int regulator_is_supported_voltage(struct regulator *regulator,
2641 int min_uV, int max_uV)
2642{
2643 struct regulator_dev *rdev = regulator->rdev;
2644 int i, voltages, ret;
2645
2646 /* If we can't change voltage check the current voltage */
2647 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2648 ret = regulator_get_voltage(regulator);
2649 if (ret >= 0)
2650 return min_uV <= ret && ret <= max_uV;
2651 else
2652 return ret;
2653 }
2654
2655 /* Any voltage within constrains range is fine? */
2656 if (rdev->desc->continuous_voltage_range)
2657 return min_uV >= rdev->constraints->min_uV &&
2658 max_uV <= rdev->constraints->max_uV;
2659
2660 ret = regulator_count_voltages(regulator);
2661 if (ret < 0)
2662 return ret;
2663 voltages = ret;
2664
2665 for (i = 0; i < voltages; i++) {
2666 ret = regulator_list_voltage(regulator, i);
2667
2668 if (ret >= min_uV && ret <= max_uV)
2669 return 1;
2670 }
2671
2672 return 0;
2673}
2674EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2675
2676static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2677 int max_uV)
2678{
2679 const struct regulator_desc *desc = rdev->desc;
2680
2681 if (desc->ops->map_voltage)
2682 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2683
2684 if (desc->ops->list_voltage == regulator_list_voltage_linear)
2685 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2686
2687 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2688 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2689
2690 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2691}
2692
2693static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2694 int min_uV, int max_uV,
2695 unsigned *selector)
2696{
2697 struct pre_voltage_change_data data;
2698 int ret;
2699
2700 data.old_uV = _regulator_get_voltage(rdev);
2701 data.min_uV = min_uV;
2702 data.max_uV = max_uV;
2703 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2704 &data);
2705 if (ret & NOTIFY_STOP_MASK)
2706 return -EINVAL;
2707
2708 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2709 if (ret >= 0)
2710 return ret;
2711
2712 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2713 (void *)data.old_uV);
2714
2715 return ret;
2716}
2717
2718static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2719 int uV, unsigned selector)
2720{
2721 struct pre_voltage_change_data data;
2722 int ret;
2723
2724 data.old_uV = _regulator_get_voltage(rdev);
2725 data.min_uV = uV;
2726 data.max_uV = uV;
2727 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2728 &data);
2729 if (ret & NOTIFY_STOP_MASK)
2730 return -EINVAL;
2731
2732 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2733 if (ret >= 0)
2734 return ret;
2735
2736 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2737 (void *)data.old_uV);
2738
2739 return ret;
2740}
2741
2742static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2743 int min_uV, int max_uV)
2744{
2745 int ret;
2746 int delay = 0;
2747 int best_val = 0;
2748 unsigned int selector;
2749 int old_selector = -1;
2750
2751 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2752
2753 min_uV += rdev->constraints->uV_offset;
2754 max_uV += rdev->constraints->uV_offset;
2755
2756 /*
2757 * If we can't obtain the old selector there is not enough
2758 * info to call set_voltage_time_sel().
2759 */
2760 if (_regulator_is_enabled(rdev) &&
2761 rdev->desc->ops->set_voltage_time_sel &&
2762 rdev->desc->ops->get_voltage_sel) {
2763 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2764 if (old_selector < 0)
2765 return old_selector;
2766 }
2767
2768 if (rdev->desc->ops->set_voltage) {
2769 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2770 &selector);
2771
2772 if (ret >= 0) {
2773 if (rdev->desc->ops->list_voltage)
2774 best_val = rdev->desc->ops->list_voltage(rdev,
2775 selector);
2776 else
2777 best_val = _regulator_get_voltage(rdev);
2778 }
2779
2780 } else if (rdev->desc->ops->set_voltage_sel) {
2781 ret = regulator_map_voltage(rdev, min_uV, max_uV);
2782 if (ret >= 0) {
2783 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2784 if (min_uV <= best_val && max_uV >= best_val) {
2785 selector = ret;
2786 if (old_selector == selector)
2787 ret = 0;
2788 else
2789 ret = _regulator_call_set_voltage_sel(
2790 rdev, best_val, selector);
2791 } else {
2792 ret = -EINVAL;
2793 }
2794 }
2795 } else {
2796 ret = -EINVAL;
2797 }
2798
2799 /* Call set_voltage_time_sel if successfully obtained old_selector */
2800 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2801 && old_selector != selector) {
2802
2803 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2804 old_selector, selector);
2805 if (delay < 0) {
2806 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2807 delay);
2808 delay = 0;
2809 }
2810
2811 /* Insert any necessary delays */
2812 if (delay >= 1000) {
2813 mdelay(delay / 1000);
2814 udelay(delay % 1000);
2815 } else if (delay) {
2816 udelay(delay);
2817 }
2818 }
2819
2820 if (ret == 0 && best_val >= 0) {
2821 unsigned long data = best_val;
2822
2823 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2824 (void *)data);
2825 }
2826
2827 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2828
2829 return ret;
2830}
2831
2832static int regulator_set_voltage_unlocked(struct regulator *regulator,
2833 int min_uV, int max_uV)
2834{
2835 struct regulator_dev *rdev = regulator->rdev;
2836 int ret = 0;
2837 int old_min_uV, old_max_uV;
2838 int current_uV;
2839 int best_supply_uV = 0;
2840 int supply_change_uV = 0;
2841
2842 /* If we're setting the same range as last time the change
2843 * should be a noop (some cpufreq implementations use the same
2844 * voltage for multiple frequencies, for example).
2845 */
2846 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2847 goto out;
2848
2849 /* If we're trying to set a range that overlaps the current voltage,
2850 * return successfully even though the regulator does not support
2851 * changing the voltage.
2852 */
2853 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2854 current_uV = _regulator_get_voltage(rdev);
2855 if (min_uV <= current_uV && current_uV <= max_uV) {
2856 regulator->min_uV = min_uV;
2857 regulator->max_uV = max_uV;
2858 goto out;
2859 }
2860 }
2861
2862 /* sanity check */
2863 if (!rdev->desc->ops->set_voltage &&
2864 !rdev->desc->ops->set_voltage_sel) {
2865 ret = -EINVAL;
2866 goto out;
2867 }
2868
2869 /* constraints check */
2870 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2871 if (ret < 0)
2872 goto out;
2873
2874 /* restore original values in case of error */
2875 old_min_uV = regulator->min_uV;
2876 old_max_uV = regulator->max_uV;
2877 regulator->min_uV = min_uV;
2878 regulator->max_uV = max_uV;
2879
2880 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2881 if (ret < 0)
2882 goto out2;
2883
2884 if (rdev->supply && (rdev->desc->min_dropout_uV ||
2885 !rdev->desc->ops->get_voltage)) {
2886 int current_supply_uV;
2887 int selector;
2888
2889 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2890 if (selector < 0) {
2891 ret = selector;
2892 goto out2;
2893 }
2894
2895 best_supply_uV = _regulator_list_voltage(regulator, selector, 0);
2896 if (best_supply_uV < 0) {
2897 ret = best_supply_uV;
2898 goto out2;
2899 }
2900
2901 best_supply_uV += rdev->desc->min_dropout_uV;
2902
2903 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2904 if (current_supply_uV < 0) {
2905 ret = current_supply_uV;
2906 goto out2;
2907 }
2908
2909 supply_change_uV = best_supply_uV - current_supply_uV;
2910 }
2911
2912 if (supply_change_uV > 0) {
2913 ret = regulator_set_voltage_unlocked(rdev->supply,
2914 best_supply_uV, INT_MAX);
2915 if (ret) {
2916 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
2917 ret);
2918 goto out2;
2919 }
2920 }
2921
2922 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2923 if (ret < 0)
2924 goto out2;
2925
2926 if (supply_change_uV < 0) {
2927 ret = regulator_set_voltage_unlocked(rdev->supply,
2928 best_supply_uV, INT_MAX);
2929 if (ret)
2930 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
2931 ret);
2932 /* No need to fail here */
2933 ret = 0;
2934 }
2935
2936out:
2937 return ret;
2938out2:
2939 regulator->min_uV = old_min_uV;
2940 regulator->max_uV = old_max_uV;
2941
2942 return ret;
2943}
2944
2945/**
2946 * regulator_set_voltage - set regulator output voltage
2947 * @regulator: regulator source
2948 * @min_uV: Minimum required voltage in uV
2949 * @max_uV: Maximum acceptable voltage in uV
2950 *
2951 * Sets a voltage regulator to the desired output voltage. This can be set
2952 * during any regulator state. IOW, regulator can be disabled or enabled.
2953 *
2954 * If the regulator is enabled then the voltage will change to the new value
2955 * immediately otherwise if the regulator is disabled the regulator will
2956 * output at the new voltage when enabled.
2957 *
2958 * NOTE: If the regulator is shared between several devices then the lowest
2959 * request voltage that meets the system constraints will be used.
2960 * Regulator system constraints must be set for this regulator before
2961 * calling this function otherwise this call will fail.
2962 */
2963int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2964{
2965 int ret = 0;
2966
2967 regulator_lock_supply(regulator->rdev);
2968
2969 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
2970
2971 regulator_unlock_supply(regulator->rdev);
2972
2973 return ret;
2974}
2975EXPORT_SYMBOL_GPL(regulator_set_voltage);
2976
2977/**
2978 * regulator_set_voltage_time - get raise/fall time
2979 * @regulator: regulator source
2980 * @old_uV: starting voltage in microvolts
2981 * @new_uV: target voltage in microvolts
2982 *
2983 * Provided with the starting and ending voltage, this function attempts to
2984 * calculate the time in microseconds required to rise or fall to this new
2985 * voltage.
2986 */
2987int regulator_set_voltage_time(struct regulator *regulator,
2988 int old_uV, int new_uV)
2989{
2990 struct regulator_dev *rdev = regulator->rdev;
2991 const struct regulator_ops *ops = rdev->desc->ops;
2992 int old_sel = -1;
2993 int new_sel = -1;
2994 int voltage;
2995 int i;
2996
2997 /* Currently requires operations to do this */
2998 if (!ops->list_voltage || !ops->set_voltage_time_sel
2999 || !rdev->desc->n_voltages)
3000 return -EINVAL;
3001
3002 for (i = 0; i < rdev->desc->n_voltages; i++) {
3003 /* We only look for exact voltage matches here */
3004 voltage = regulator_list_voltage(regulator, i);
3005 if (voltage < 0)
3006 return -EINVAL;
3007 if (voltage == 0)
3008 continue;
3009 if (voltage == old_uV)
3010 old_sel = i;
3011 if (voltage == new_uV)
3012 new_sel = i;
3013 }
3014
3015 if (old_sel < 0 || new_sel < 0)
3016 return -EINVAL;
3017
3018 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3019}
3020EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3021
3022/**
3023 * regulator_set_voltage_time_sel - get raise/fall time
3024 * @rdev: regulator source device
3025 * @old_selector: selector for starting voltage
3026 * @new_selector: selector for target voltage
3027 *
3028 * Provided with the starting and target voltage selectors, this function
3029 * returns time in microseconds required to rise or fall to this new voltage
3030 *
3031 * Drivers providing ramp_delay in regulation_constraints can use this as their
3032 * set_voltage_time_sel() operation.
3033 */
3034int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3035 unsigned int old_selector,
3036 unsigned int new_selector)
3037{
3038 unsigned int ramp_delay = 0;
3039 int old_volt, new_volt;
3040
3041 if (rdev->constraints->ramp_delay)
3042 ramp_delay = rdev->constraints->ramp_delay;
3043 else if (rdev->desc->ramp_delay)
3044 ramp_delay = rdev->desc->ramp_delay;
3045
3046 if (ramp_delay == 0) {
3047 rdev_warn(rdev, "ramp_delay not set\n");
3048 return 0;
3049 }
3050
3051 /* sanity check */
3052 if (!rdev->desc->ops->list_voltage)
3053 return -EINVAL;
3054
3055 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3056 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3057
3058 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
3059}
3060EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
3061
3062/**
3063 * regulator_sync_voltage - re-apply last regulator output voltage
3064 * @regulator: regulator source
3065 *
3066 * Re-apply the last configured voltage. This is intended to be used
3067 * where some external control source the consumer is cooperating with
3068 * has caused the configured voltage to change.
3069 */
3070int regulator_sync_voltage(struct regulator *regulator)
3071{
3072 struct regulator_dev *rdev = regulator->rdev;
3073 int ret, min_uV, max_uV;
3074
3075 mutex_lock(&rdev->mutex);
3076
3077 if (!rdev->desc->ops->set_voltage &&
3078 !rdev->desc->ops->set_voltage_sel) {
3079 ret = -EINVAL;
3080 goto out;
3081 }
3082
3083 /* This is only going to work if we've had a voltage configured. */
3084 if (!regulator->min_uV && !regulator->max_uV) {
3085 ret = -EINVAL;
3086 goto out;
3087 }
3088
3089 min_uV = regulator->min_uV;
3090 max_uV = regulator->max_uV;
3091
3092 /* This should be a paranoia check... */
3093 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3094 if (ret < 0)
3095 goto out;
3096
3097 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
3098 if (ret < 0)
3099 goto out;
3100
3101 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3102
3103out:
3104 mutex_unlock(&rdev->mutex);
3105 return ret;
3106}
3107EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3108
3109static int _regulator_get_voltage(struct regulator_dev *rdev)
3110{
3111 int sel, ret;
3112
3113 if (rdev->desc->ops->get_voltage_sel) {
3114 sel = rdev->desc->ops->get_voltage_sel(rdev);
3115 if (sel < 0)
3116 return sel;
3117 ret = rdev->desc->ops->list_voltage(rdev, sel);
3118 } else if (rdev->desc->ops->get_voltage) {
3119 ret = rdev->desc->ops->get_voltage(rdev);
3120 } else if (rdev->desc->ops->list_voltage) {
3121 ret = rdev->desc->ops->list_voltage(rdev, 0);
3122 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3123 ret = rdev->desc->fixed_uV;
3124 } else if (rdev->supply) {
3125 ret = _regulator_get_voltage(rdev->supply->rdev);
3126 } else {
3127 return -EINVAL;
3128 }
3129
3130 if (ret < 0)
3131 return ret;
3132 return ret - rdev->constraints->uV_offset;
3133}
3134
3135/**
3136 * regulator_get_voltage - get regulator output voltage
3137 * @regulator: regulator source
3138 *
3139 * This returns the current regulator voltage in uV.
3140 *
3141 * NOTE: If the regulator is disabled it will return the voltage value. This
3142 * function should not be used to determine regulator state.
3143 */
3144int regulator_get_voltage(struct regulator *regulator)
3145{
3146 int ret;
3147
3148 regulator_lock_supply(regulator->rdev);
3149
3150 ret = _regulator_get_voltage(regulator->rdev);
3151
3152 regulator_unlock_supply(regulator->rdev);
3153
3154 return ret;
3155}
3156EXPORT_SYMBOL_GPL(regulator_get_voltage);
3157
3158/**
3159 * regulator_set_current_limit - set regulator output current limit
3160 * @regulator: regulator source
3161 * @min_uA: Minimum supported current in uA
3162 * @max_uA: Maximum supported current in uA
3163 *
3164 * Sets current sink to the desired output current. This can be set during
3165 * any regulator state. IOW, regulator can be disabled or enabled.
3166 *
3167 * If the regulator is enabled then the current will change to the new value
3168 * immediately otherwise if the regulator is disabled the regulator will
3169 * output at the new current when enabled.
3170 *
3171 * NOTE: Regulator system constraints must be set for this regulator before
3172 * calling this function otherwise this call will fail.
3173 */
3174int regulator_set_current_limit(struct regulator *regulator,
3175 int min_uA, int max_uA)
3176{
3177 struct regulator_dev *rdev = regulator->rdev;
3178 int ret;
3179
3180 mutex_lock(&rdev->mutex);
3181
3182 /* sanity check */
3183 if (!rdev->desc->ops->set_current_limit) {
3184 ret = -EINVAL;
3185 goto out;
3186 }
3187
3188 /* constraints check */
3189 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3190 if (ret < 0)
3191 goto out;
3192
3193 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3194out:
3195 mutex_unlock(&rdev->mutex);
3196 return ret;
3197}
3198EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3199
3200static int _regulator_get_current_limit(struct regulator_dev *rdev)
3201{
3202 int ret;
3203
3204 mutex_lock(&rdev->mutex);
3205
3206 /* sanity check */
3207 if (!rdev->desc->ops->get_current_limit) {
3208 ret = -EINVAL;
3209 goto out;
3210 }
3211
3212 ret = rdev->desc->ops->get_current_limit(rdev);
3213out:
3214 mutex_unlock(&rdev->mutex);
3215 return ret;
3216}
3217
3218/**
3219 * regulator_get_current_limit - get regulator output current
3220 * @regulator: regulator source
3221 *
3222 * This returns the current supplied by the specified current sink in uA.
3223 *
3224 * NOTE: If the regulator is disabled it will return the current value. This
3225 * function should not be used to determine regulator state.
3226 */
3227int regulator_get_current_limit(struct regulator *regulator)
3228{
3229 return _regulator_get_current_limit(regulator->rdev);
3230}
3231EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3232
3233/**
3234 * regulator_set_mode - set regulator operating mode
3235 * @regulator: regulator source
3236 * @mode: operating mode - one of the REGULATOR_MODE constants
3237 *
3238 * Set regulator operating mode to increase regulator efficiency or improve
3239 * regulation performance.
3240 *
3241 * NOTE: Regulator system constraints must be set for this regulator before
3242 * calling this function otherwise this call will fail.
3243 */
3244int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3245{
3246 struct regulator_dev *rdev = regulator->rdev;
3247 int ret;
3248 int regulator_curr_mode;
3249
3250 mutex_lock(&rdev->mutex);
3251
3252 /* sanity check */
3253 if (!rdev->desc->ops->set_mode) {
3254 ret = -EINVAL;
3255 goto out;
3256 }
3257
3258 /* return if the same mode is requested */
3259 if (rdev->desc->ops->get_mode) {
3260 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3261 if (regulator_curr_mode == mode) {
3262 ret = 0;
3263 goto out;
3264 }
3265 }
3266
3267 /* constraints check */
3268 ret = regulator_mode_constrain(rdev, &mode);
3269 if (ret < 0)
3270 goto out;
3271
3272 ret = rdev->desc->ops->set_mode(rdev, mode);
3273out:
3274 mutex_unlock(&rdev->mutex);
3275 return ret;
3276}
3277EXPORT_SYMBOL_GPL(regulator_set_mode);
3278
3279static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3280{
3281 int ret;
3282
3283 mutex_lock(&rdev->mutex);
3284
3285 /* sanity check */
3286 if (!rdev->desc->ops->get_mode) {
3287 ret = -EINVAL;
3288 goto out;
3289 }
3290
3291 ret = rdev->desc->ops->get_mode(rdev);
3292out:
3293 mutex_unlock(&rdev->mutex);
3294 return ret;
3295}
3296
3297/**
3298 * regulator_get_mode - get regulator operating mode
3299 * @regulator: regulator source
3300 *
3301 * Get the current regulator operating mode.
3302 */
3303unsigned int regulator_get_mode(struct regulator *regulator)
3304{
3305 return _regulator_get_mode(regulator->rdev);
3306}
3307EXPORT_SYMBOL_GPL(regulator_get_mode);
3308
3309/**
3310 * regulator_set_load - set regulator load
3311 * @regulator: regulator source
3312 * @uA_load: load current
3313 *
3314 * Notifies the regulator core of a new device load. This is then used by
3315 * DRMS (if enabled by constraints) to set the most efficient regulator
3316 * operating mode for the new regulator loading.
3317 *
3318 * Consumer devices notify their supply regulator of the maximum power
3319 * they will require (can be taken from device datasheet in the power
3320 * consumption tables) when they change operational status and hence power
3321 * state. Examples of operational state changes that can affect power
3322 * consumption are :-
3323 *
3324 * o Device is opened / closed.
3325 * o Device I/O is about to begin or has just finished.
3326 * o Device is idling in between work.
3327 *
3328 * This information is also exported via sysfs to userspace.
3329 *
3330 * DRMS will sum the total requested load on the regulator and change
3331 * to the most efficient operating mode if platform constraints allow.
3332 *
3333 * On error a negative errno is returned.
3334 */
3335int regulator_set_load(struct regulator *regulator, int uA_load)
3336{
3337 struct regulator_dev *rdev = regulator->rdev;
3338 int ret;
3339
3340 mutex_lock(&rdev->mutex);
3341 regulator->uA_load = uA_load;
3342 ret = drms_uA_update(rdev);
3343 mutex_unlock(&rdev->mutex);
3344
3345 return ret;
3346}
3347EXPORT_SYMBOL_GPL(regulator_set_load);
3348
3349/**
3350 * regulator_allow_bypass - allow the regulator to go into bypass mode
3351 *
3352 * @regulator: Regulator to configure
3353 * @enable: enable or disable bypass mode
3354 *
3355 * Allow the regulator to go into bypass mode if all other consumers
3356 * for the regulator also enable bypass mode and the machine
3357 * constraints allow this. Bypass mode means that the regulator is
3358 * simply passing the input directly to the output with no regulation.
3359 */
3360int regulator_allow_bypass(struct regulator *regulator, bool enable)
3361{
3362 struct regulator_dev *rdev = regulator->rdev;
3363 int ret = 0;
3364
3365 if (!rdev->desc->ops->set_bypass)
3366 return 0;
3367
3368 if (rdev->constraints &&
3369 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3370 return 0;
3371
3372 mutex_lock(&rdev->mutex);
3373
3374 if (enable && !regulator->bypass) {
3375 rdev->bypass_count++;
3376
3377 if (rdev->bypass_count == rdev->open_count) {
3378 ret = rdev->desc->ops->set_bypass(rdev, enable);
3379 if (ret != 0)
3380 rdev->bypass_count--;
3381 }
3382
3383 } else if (!enable && regulator->bypass) {
3384 rdev->bypass_count--;
3385
3386 if (rdev->bypass_count != rdev->open_count) {
3387 ret = rdev->desc->ops->set_bypass(rdev, enable);
3388 if (ret != 0)
3389 rdev->bypass_count++;
3390 }
3391 }
3392
3393 if (ret == 0)
3394 regulator->bypass = enable;
3395
3396 mutex_unlock(&rdev->mutex);
3397
3398 return ret;
3399}
3400EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3401
3402/**
3403 * regulator_register_notifier - register regulator event notifier
3404 * @regulator: regulator source
3405 * @nb: notifier block
3406 *
3407 * Register notifier block to receive regulator events.
3408 */
3409int regulator_register_notifier(struct regulator *regulator,
3410 struct notifier_block *nb)
3411{
3412 return blocking_notifier_chain_register(®ulator->rdev->notifier,
3413 nb);
3414}
3415EXPORT_SYMBOL_GPL(regulator_register_notifier);
3416
3417/**
3418 * regulator_unregister_notifier - unregister regulator event notifier
3419 * @regulator: regulator source
3420 * @nb: notifier block
3421 *
3422 * Unregister regulator event notifier block.
3423 */
3424int regulator_unregister_notifier(struct regulator *regulator,
3425 struct notifier_block *nb)
3426{
3427 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
3428 nb);
3429}
3430EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3431
3432/* notify regulator consumers and downstream regulator consumers.
3433 * Note mutex must be held by caller.
3434 */
3435static int _notifier_call_chain(struct regulator_dev *rdev,
3436 unsigned long event, void *data)
3437{
3438 /* call rdev chain first */
3439 return blocking_notifier_call_chain(&rdev->notifier, event, data);
3440}
3441
3442/**
3443 * regulator_bulk_get - get multiple regulator consumers
3444 *
3445 * @dev: Device to supply
3446 * @num_consumers: Number of consumers to register
3447 * @consumers: Configuration of consumers; clients are stored here.
3448 *
3449 * @return 0 on success, an errno on failure.
3450 *
3451 * This helper function allows drivers to get several regulator
3452 * consumers in one operation. If any of the regulators cannot be
3453 * acquired then any regulators that were allocated will be freed
3454 * before returning to the caller.
3455 */
3456int regulator_bulk_get(struct device *dev, int num_consumers,
3457 struct regulator_bulk_data *consumers)
3458{
3459 int i;
3460 int ret;
3461
3462 for (i = 0; i < num_consumers; i++)
3463 consumers[i].consumer = NULL;
3464
3465 for (i = 0; i < num_consumers; i++) {
3466 consumers[i].consumer = _regulator_get(dev,
3467 consumers[i].supply,
3468 false,
3469 !consumers[i].optional);
3470 if (IS_ERR(consumers[i].consumer)) {
3471 ret = PTR_ERR(consumers[i].consumer);
3472 dev_err(dev, "Failed to get supply '%s': %d\n",
3473 consumers[i].supply, ret);
3474 consumers[i].consumer = NULL;
3475 goto err;
3476 }
3477 }
3478
3479 return 0;
3480
3481err:
3482 while (--i >= 0)
3483 regulator_put(consumers[i].consumer);
3484
3485 return ret;
3486}
3487EXPORT_SYMBOL_GPL(regulator_bulk_get);
3488
3489static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3490{
3491 struct regulator_bulk_data *bulk = data;
3492
3493 bulk->ret = regulator_enable(bulk->consumer);
3494}
3495
3496/**
3497 * regulator_bulk_enable - enable multiple regulator consumers
3498 *
3499 * @num_consumers: Number of consumers
3500 * @consumers: Consumer data; clients are stored here.
3501 * @return 0 on success, an errno on failure
3502 *
3503 * This convenience API allows consumers to enable multiple regulator
3504 * clients in a single API call. If any consumers cannot be enabled
3505 * then any others that were enabled will be disabled again prior to
3506 * return.
3507 */
3508int regulator_bulk_enable(int num_consumers,
3509 struct regulator_bulk_data *consumers)
3510{
3511 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3512 int i;
3513 int ret = 0;
3514
3515 for (i = 0; i < num_consumers; i++) {
3516 if (consumers[i].consumer->always_on)
3517 consumers[i].ret = 0;
3518 else
3519 async_schedule_domain(regulator_bulk_enable_async,
3520 &consumers[i], &async_domain);
3521 }
3522
3523 async_synchronize_full_domain(&async_domain);
3524
3525 /* If any consumer failed we need to unwind any that succeeded */
3526 for (i = 0; i < num_consumers; i++) {
3527 if (consumers[i].ret != 0) {
3528 ret = consumers[i].ret;
3529 goto err;
3530 }
3531 }
3532
3533 return 0;
3534
3535err:
3536 for (i = 0; i < num_consumers; i++) {
3537 if (consumers[i].ret < 0)
3538 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3539 consumers[i].ret);
3540 else
3541 regulator_disable(consumers[i].consumer);
3542 }
3543
3544 return ret;
3545}
3546EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3547
3548/**
3549 * regulator_bulk_disable - disable multiple regulator consumers
3550 *
3551 * @num_consumers: Number of consumers
3552 * @consumers: Consumer data; clients are stored here.
3553 * @return 0 on success, an errno on failure
3554 *
3555 * This convenience API allows consumers to disable multiple regulator
3556 * clients in a single API call. If any consumers cannot be disabled
3557 * then any others that were disabled will be enabled again prior to
3558 * return.
3559 */
3560int regulator_bulk_disable(int num_consumers,
3561 struct regulator_bulk_data *consumers)
3562{
3563 int i;
3564 int ret, r;
3565
3566 for (i = num_consumers - 1; i >= 0; --i) {
3567 ret = regulator_disable(consumers[i].consumer);
3568 if (ret != 0)
3569 goto err;
3570 }
3571
3572 return 0;
3573
3574err:
3575 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3576 for (++i; i < num_consumers; ++i) {
3577 r = regulator_enable(consumers[i].consumer);
3578 if (r != 0)
3579 pr_err("Failed to reename %s: %d\n",
3580 consumers[i].supply, r);
3581 }
3582
3583 return ret;
3584}
3585EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3586
3587/**
3588 * regulator_bulk_force_disable - force disable multiple regulator consumers
3589 *
3590 * @num_consumers: Number of consumers
3591 * @consumers: Consumer data; clients are stored here.
3592 * @return 0 on success, an errno on failure
3593 *
3594 * This convenience API allows consumers to forcibly disable multiple regulator
3595 * clients in a single API call.
3596 * NOTE: This should be used for situations when device damage will
3597 * likely occur if the regulators are not disabled (e.g. over temp).
3598 * Although regulator_force_disable function call for some consumers can
3599 * return error numbers, the function is called for all consumers.
3600 */
3601int regulator_bulk_force_disable(int num_consumers,
3602 struct regulator_bulk_data *consumers)
3603{
3604 int i;
3605 int ret;
3606
3607 for (i = 0; i < num_consumers; i++)
3608 consumers[i].ret =
3609 regulator_force_disable(consumers[i].consumer);
3610
3611 for (i = 0; i < num_consumers; i++) {
3612 if (consumers[i].ret != 0) {
3613 ret = consumers[i].ret;
3614 goto out;
3615 }
3616 }
3617
3618 return 0;
3619out:
3620 return ret;
3621}
3622EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3623
3624/**
3625 * regulator_bulk_free - free multiple regulator consumers
3626 *
3627 * @num_consumers: Number of consumers
3628 * @consumers: Consumer data; clients are stored here.
3629 *
3630 * This convenience API allows consumers to free multiple regulator
3631 * clients in a single API call.
3632 */
3633void regulator_bulk_free(int num_consumers,
3634 struct regulator_bulk_data *consumers)
3635{
3636 int i;
3637
3638 for (i = 0; i < num_consumers; i++) {
3639 regulator_put(consumers[i].consumer);
3640 consumers[i].consumer = NULL;
3641 }
3642}
3643EXPORT_SYMBOL_GPL(regulator_bulk_free);
3644
3645/**
3646 * regulator_notifier_call_chain - call regulator event notifier
3647 * @rdev: regulator source
3648 * @event: notifier block
3649 * @data: callback-specific data.
3650 *
3651 * Called by regulator drivers to notify clients a regulator event has
3652 * occurred. We also notify regulator clients downstream.
3653 * Note lock must be held by caller.
3654 */
3655int regulator_notifier_call_chain(struct regulator_dev *rdev,
3656 unsigned long event, void *data)
3657{
3658 lockdep_assert_held_once(&rdev->mutex);
3659
3660 _notifier_call_chain(rdev, event, data);
3661 return NOTIFY_DONE;
3662
3663}
3664EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3665
3666/**
3667 * regulator_mode_to_status - convert a regulator mode into a status
3668 *
3669 * @mode: Mode to convert
3670 *
3671 * Convert a regulator mode into a status.
3672 */
3673int regulator_mode_to_status(unsigned int mode)
3674{
3675 switch (mode) {
3676 case REGULATOR_MODE_FAST:
3677 return REGULATOR_STATUS_FAST;
3678 case REGULATOR_MODE_NORMAL:
3679 return REGULATOR_STATUS_NORMAL;
3680 case REGULATOR_MODE_IDLE:
3681 return REGULATOR_STATUS_IDLE;
3682 case REGULATOR_MODE_STANDBY:
3683 return REGULATOR_STATUS_STANDBY;
3684 default:
3685 return REGULATOR_STATUS_UNDEFINED;
3686 }
3687}
3688EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3689
3690static struct attribute *regulator_dev_attrs[] = {
3691 &dev_attr_name.attr,
3692 &dev_attr_num_users.attr,
3693 &dev_attr_type.attr,
3694 &dev_attr_microvolts.attr,
3695 &dev_attr_microamps.attr,
3696 &dev_attr_opmode.attr,
3697 &dev_attr_state.attr,
3698 &dev_attr_status.attr,
3699 &dev_attr_bypass.attr,
3700 &dev_attr_requested_microamps.attr,
3701 &dev_attr_min_microvolts.attr,
3702 &dev_attr_max_microvolts.attr,
3703 &dev_attr_min_microamps.attr,
3704 &dev_attr_max_microamps.attr,
3705 &dev_attr_suspend_standby_state.attr,
3706 &dev_attr_suspend_mem_state.attr,
3707 &dev_attr_suspend_disk_state.attr,
3708 &dev_attr_suspend_standby_microvolts.attr,
3709 &dev_attr_suspend_mem_microvolts.attr,
3710 &dev_attr_suspend_disk_microvolts.attr,
3711 &dev_attr_suspend_standby_mode.attr,
3712 &dev_attr_suspend_mem_mode.attr,
3713 &dev_attr_suspend_disk_mode.attr,
3714 NULL
3715};
3716
3717/*
3718 * To avoid cluttering sysfs (and memory) with useless state, only
3719 * create attributes that can be meaningfully displayed.
3720 */
3721static umode_t regulator_attr_is_visible(struct kobject *kobj,
3722 struct attribute *attr, int idx)
3723{
3724 struct device *dev = kobj_to_dev(kobj);
3725 struct regulator_dev *rdev = dev_to_rdev(dev);
3726 const struct regulator_ops *ops = rdev->desc->ops;
3727 umode_t mode = attr->mode;
3728
3729 /* these three are always present */
3730 if (attr == &dev_attr_name.attr ||
3731 attr == &dev_attr_num_users.attr ||
3732 attr == &dev_attr_type.attr)
3733 return mode;
3734
3735 /* some attributes need specific methods to be displayed */
3736 if (attr == &dev_attr_microvolts.attr) {
3737 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3738 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3739 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3740 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3741 return mode;
3742 return 0;
3743 }
3744
3745 if (attr == &dev_attr_microamps.attr)
3746 return ops->get_current_limit ? mode : 0;
3747
3748 if (attr == &dev_attr_opmode.attr)
3749 return ops->get_mode ? mode : 0;
3750
3751 if (attr == &dev_attr_state.attr)
3752 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3753
3754 if (attr == &dev_attr_status.attr)
3755 return ops->get_status ? mode : 0;
3756
3757 if (attr == &dev_attr_bypass.attr)
3758 return ops->get_bypass ? mode : 0;
3759
3760 /* some attributes are type-specific */
3761 if (attr == &dev_attr_requested_microamps.attr)
3762 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
3763
3764 /* constraints need specific supporting methods */
3765 if (attr == &dev_attr_min_microvolts.attr ||
3766 attr == &dev_attr_max_microvolts.attr)
3767 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3768
3769 if (attr == &dev_attr_min_microamps.attr ||
3770 attr == &dev_attr_max_microamps.attr)
3771 return ops->set_current_limit ? mode : 0;
3772
3773 if (attr == &dev_attr_suspend_standby_state.attr ||
3774 attr == &dev_attr_suspend_mem_state.attr ||
3775 attr == &dev_attr_suspend_disk_state.attr)
3776 return mode;
3777
3778 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3779 attr == &dev_attr_suspend_mem_microvolts.attr ||
3780 attr == &dev_attr_suspend_disk_microvolts.attr)
3781 return ops->set_suspend_voltage ? mode : 0;
3782
3783 if (attr == &dev_attr_suspend_standby_mode.attr ||
3784 attr == &dev_attr_suspend_mem_mode.attr ||
3785 attr == &dev_attr_suspend_disk_mode.attr)
3786 return ops->set_suspend_mode ? mode : 0;
3787
3788 return mode;
3789}
3790
3791static const struct attribute_group regulator_dev_group = {
3792 .attrs = regulator_dev_attrs,
3793 .is_visible = regulator_attr_is_visible,
3794};
3795
3796static const struct attribute_group *regulator_dev_groups[] = {
3797 ®ulator_dev_group,
3798 NULL
3799};
3800
3801static void regulator_dev_release(struct device *dev)
3802{
3803 struct regulator_dev *rdev = dev_get_drvdata(dev);
3804
3805 kfree(rdev->constraints);
3806 of_node_put(rdev->dev.of_node);
3807 kfree(rdev);
3808}
3809
3810static struct class regulator_class = {
3811 .name = "regulator",
3812 .dev_release = regulator_dev_release,
3813 .dev_groups = regulator_dev_groups,
3814};
3815
3816static void rdev_init_debugfs(struct regulator_dev *rdev)
3817{
3818 struct device *parent = rdev->dev.parent;
3819 const char *rname = rdev_get_name(rdev);
3820 char name[NAME_MAX];
3821
3822 /* Avoid duplicate debugfs directory names */
3823 if (parent && rname == rdev->desc->name) {
3824 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3825 rname);
3826 rname = name;
3827 }
3828
3829 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
3830 if (!rdev->debugfs) {
3831 rdev_warn(rdev, "Failed to create debugfs directory\n");
3832 return;
3833 }
3834
3835 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3836 &rdev->use_count);
3837 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3838 &rdev->open_count);
3839 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3840 &rdev->bypass_count);
3841}
3842
3843/**
3844 * regulator_register - register regulator
3845 * @regulator_desc: regulator to register
3846 * @cfg: runtime configuration for regulator
3847 *
3848 * Called by regulator drivers to register a regulator.
3849 * Returns a valid pointer to struct regulator_dev on success
3850 * or an ERR_PTR() on error.
3851 */
3852struct regulator_dev *
3853regulator_register(const struct regulator_desc *regulator_desc,
3854 const struct regulator_config *cfg)
3855{
3856 const struct regulation_constraints *constraints = NULL;
3857 const struct regulator_init_data *init_data;
3858 struct regulator_config *config = NULL;
3859 static atomic_t regulator_no = ATOMIC_INIT(-1);
3860 struct regulator_dev *rdev;
3861 struct device *dev;
3862 int ret, i;
3863
3864 if (regulator_desc == NULL || cfg == NULL)
3865 return ERR_PTR(-EINVAL);
3866
3867 dev = cfg->dev;
3868 WARN_ON(!dev);
3869
3870 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3871 return ERR_PTR(-EINVAL);
3872
3873 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3874 regulator_desc->type != REGULATOR_CURRENT)
3875 return ERR_PTR(-EINVAL);
3876
3877 /* Only one of each should be implemented */
3878 WARN_ON(regulator_desc->ops->get_voltage &&
3879 regulator_desc->ops->get_voltage_sel);
3880 WARN_ON(regulator_desc->ops->set_voltage &&
3881 regulator_desc->ops->set_voltage_sel);
3882
3883 /* If we're using selectors we must implement list_voltage. */
3884 if (regulator_desc->ops->get_voltage_sel &&
3885 !regulator_desc->ops->list_voltage) {
3886 return ERR_PTR(-EINVAL);
3887 }
3888 if (regulator_desc->ops->set_voltage_sel &&
3889 !regulator_desc->ops->list_voltage) {
3890 return ERR_PTR(-EINVAL);
3891 }
3892
3893 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3894 if (rdev == NULL)
3895 return ERR_PTR(-ENOMEM);
3896
3897 /*
3898 * Duplicate the config so the driver could override it after
3899 * parsing init data.
3900 */
3901 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
3902 if (config == NULL) {
3903 kfree(rdev);
3904 return ERR_PTR(-ENOMEM);
3905 }
3906
3907 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
3908 &rdev->dev.of_node);
3909 if (!init_data) {
3910 init_data = config->init_data;
3911 rdev->dev.of_node = of_node_get(config->of_node);
3912 }
3913
3914 mutex_lock(®ulator_list_mutex);
3915
3916 mutex_init(&rdev->mutex);
3917 rdev->reg_data = config->driver_data;
3918 rdev->owner = regulator_desc->owner;
3919 rdev->desc = regulator_desc;
3920 if (config->regmap)
3921 rdev->regmap = config->regmap;
3922 else if (dev_get_regmap(dev, NULL))
3923 rdev->regmap = dev_get_regmap(dev, NULL);
3924 else if (dev->parent)
3925 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3926 INIT_LIST_HEAD(&rdev->consumer_list);
3927 INIT_LIST_HEAD(&rdev->list);
3928 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3929 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3930
3931 /* preform any regulator specific init */
3932 if (init_data && init_data->regulator_init) {
3933 ret = init_data->regulator_init(rdev->reg_data);
3934 if (ret < 0)
3935 goto clean;
3936 }
3937
3938 if ((config->ena_gpio || config->ena_gpio_initialized) &&
3939 gpio_is_valid(config->ena_gpio)) {
3940 ret = regulator_ena_gpio_request(rdev, config);
3941 if (ret != 0) {
3942 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3943 config->ena_gpio, ret);
3944 goto clean;
3945 }
3946 }
3947
3948 /* register with sysfs */
3949 rdev->dev.class = ®ulator_class;
3950 rdev->dev.parent = dev;
3951 dev_set_name(&rdev->dev, "regulator.%lu",
3952 (unsigned long) atomic_inc_return(®ulator_no));
3953 ret = device_register(&rdev->dev);
3954 if (ret != 0) {
3955 put_device(&rdev->dev);
3956 goto wash;
3957 }
3958
3959 dev_set_drvdata(&rdev->dev, rdev);
3960
3961 /* set regulator constraints */
3962 if (init_data)
3963 constraints = &init_data->constraints;
3964
3965 ret = set_machine_constraints(rdev, constraints);
3966 if (ret < 0)
3967 goto scrub;
3968
3969 if (init_data && init_data->supply_regulator)
3970 rdev->supply_name = init_data->supply_regulator;
3971 else if (regulator_desc->supply_name)
3972 rdev->supply_name = regulator_desc->supply_name;
3973
3974 /* add consumers devices */
3975 if (init_data) {
3976 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3977 ret = set_consumer_device_supply(rdev,
3978 init_data->consumer_supplies[i].dev_name,
3979 init_data->consumer_supplies[i].supply);
3980 if (ret < 0) {
3981 dev_err(dev, "Failed to set supply %s\n",
3982 init_data->consumer_supplies[i].supply);
3983 goto unset_supplies;
3984 }
3985 }
3986 }
3987
3988 rdev_init_debugfs(rdev);
3989out:
3990 mutex_unlock(®ulator_list_mutex);
3991 kfree(config);
3992 return rdev;
3993
3994unset_supplies:
3995 unset_regulator_supplies(rdev);
3996
3997scrub:
3998 regulator_ena_gpio_free(rdev);
3999 device_unregister(&rdev->dev);
4000 /* device core frees rdev */
4001 rdev = ERR_PTR(ret);
4002 goto out;
4003
4004wash:
4005 regulator_ena_gpio_free(rdev);
4006clean:
4007 kfree(rdev);
4008 rdev = ERR_PTR(ret);
4009 goto out;
4010}
4011EXPORT_SYMBOL_GPL(regulator_register);
4012
4013/**
4014 * regulator_unregister - unregister regulator
4015 * @rdev: regulator to unregister
4016 *
4017 * Called by regulator drivers to unregister a regulator.
4018 */
4019void regulator_unregister(struct regulator_dev *rdev)
4020{
4021 if (rdev == NULL)
4022 return;
4023
4024 if (rdev->supply) {
4025 while (rdev->use_count--)
4026 regulator_disable(rdev->supply);
4027 regulator_put(rdev->supply);
4028 }
4029 mutex_lock(®ulator_list_mutex);
4030 debugfs_remove_recursive(rdev->debugfs);
4031 flush_work(&rdev->disable_work.work);
4032 WARN_ON(rdev->open_count);
4033 unset_regulator_supplies(rdev);
4034 list_del(&rdev->list);
4035 mutex_unlock(®ulator_list_mutex);
4036 regulator_ena_gpio_free(rdev);
4037 device_unregister(&rdev->dev);
4038}
4039EXPORT_SYMBOL_GPL(regulator_unregister);
4040
4041static int _regulator_suspend_prepare(struct device *dev, void *data)
4042{
4043 struct regulator_dev *rdev = dev_to_rdev(dev);
4044 const suspend_state_t *state = data;
4045 int ret;
4046
4047 mutex_lock(&rdev->mutex);
4048 ret = suspend_prepare(rdev, *state);
4049 mutex_unlock(&rdev->mutex);
4050
4051 return ret;
4052}
4053
4054/**
4055 * regulator_suspend_prepare - prepare regulators for system wide suspend
4056 * @state: system suspend state
4057 *
4058 * Configure each regulator with it's suspend operating parameters for state.
4059 * This will usually be called by machine suspend code prior to supending.
4060 */
4061int regulator_suspend_prepare(suspend_state_t state)
4062{
4063 /* ON is handled by regulator active state */
4064 if (state == PM_SUSPEND_ON)
4065 return -EINVAL;
4066
4067 return class_for_each_device(®ulator_class, NULL, &state,
4068 _regulator_suspend_prepare);
4069}
4070EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
4071
4072static int _regulator_suspend_finish(struct device *dev, void *data)
4073{
4074 struct regulator_dev *rdev = dev_to_rdev(dev);
4075 int ret;
4076
4077 mutex_lock(&rdev->mutex);
4078 if (rdev->use_count > 0 || rdev->constraints->always_on) {
4079 if (!_regulator_is_enabled(rdev)) {
4080 ret = _regulator_do_enable(rdev);
4081 if (ret)
4082 dev_err(dev,
4083 "Failed to resume regulator %d\n",
4084 ret);
4085 }
4086 } else {
4087 if (!have_full_constraints())
4088 goto unlock;
4089 if (!_regulator_is_enabled(rdev))
4090 goto unlock;
4091
4092 ret = _regulator_do_disable(rdev);
4093 if (ret)
4094 dev_err(dev, "Failed to suspend regulator %d\n", ret);
4095 }
4096unlock:
4097 mutex_unlock(&rdev->mutex);
4098
4099 /* Keep processing regulators in spite of any errors */
4100 return 0;
4101}
4102
4103/**
4104 * regulator_suspend_finish - resume regulators from system wide suspend
4105 *
4106 * Turn on regulators that might be turned off by regulator_suspend_prepare
4107 * and that should be turned on according to the regulators properties.
4108 */
4109int regulator_suspend_finish(void)
4110{
4111 return class_for_each_device(®ulator_class, NULL, NULL,
4112 _regulator_suspend_finish);
4113}
4114EXPORT_SYMBOL_GPL(regulator_suspend_finish);
4115
4116/**
4117 * regulator_has_full_constraints - the system has fully specified constraints
4118 *
4119 * Calling this function will cause the regulator API to disable all
4120 * regulators which have a zero use count and don't have an always_on
4121 * constraint in a late_initcall.
4122 *
4123 * The intention is that this will become the default behaviour in a
4124 * future kernel release so users are encouraged to use this facility
4125 * now.
4126 */
4127void regulator_has_full_constraints(void)
4128{
4129 has_full_constraints = 1;
4130}
4131EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4132
4133/**
4134 * rdev_get_drvdata - get rdev regulator driver data
4135 * @rdev: regulator
4136 *
4137 * Get rdev regulator driver private data. This call can be used in the
4138 * regulator driver context.
4139 */
4140void *rdev_get_drvdata(struct regulator_dev *rdev)
4141{
4142 return rdev->reg_data;
4143}
4144EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4145
4146/**
4147 * regulator_get_drvdata - get regulator driver data
4148 * @regulator: regulator
4149 *
4150 * Get regulator driver private data. This call can be used in the consumer
4151 * driver context when non API regulator specific functions need to be called.
4152 */
4153void *regulator_get_drvdata(struct regulator *regulator)
4154{
4155 return regulator->rdev->reg_data;
4156}
4157EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4158
4159/**
4160 * regulator_set_drvdata - set regulator driver data
4161 * @regulator: regulator
4162 * @data: data
4163 */
4164void regulator_set_drvdata(struct regulator *regulator, void *data)
4165{
4166 regulator->rdev->reg_data = data;
4167}
4168EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4169
4170/**
4171 * regulator_get_id - get regulator ID
4172 * @rdev: regulator
4173 */
4174int rdev_get_id(struct regulator_dev *rdev)
4175{
4176 return rdev->desc->id;
4177}
4178EXPORT_SYMBOL_GPL(rdev_get_id);
4179
4180struct device *rdev_get_dev(struct regulator_dev *rdev)
4181{
4182 return &rdev->dev;
4183}
4184EXPORT_SYMBOL_GPL(rdev_get_dev);
4185
4186void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4187{
4188 return reg_init_data->driver_data;
4189}
4190EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4191
4192#ifdef CONFIG_DEBUG_FS
4193static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
4194 size_t count, loff_t *ppos)
4195{
4196 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
4197 ssize_t len, ret = 0;
4198 struct regulator_map *map;
4199
4200 if (!buf)
4201 return -ENOMEM;
4202
4203 list_for_each_entry(map, ®ulator_map_list, list) {
4204 len = snprintf(buf + ret, PAGE_SIZE - ret,
4205 "%s -> %s.%s\n",
4206 rdev_get_name(map->regulator), map->dev_name,
4207 map->supply);
4208 if (len >= 0)
4209 ret += len;
4210 if (ret > PAGE_SIZE) {
4211 ret = PAGE_SIZE;
4212 break;
4213 }
4214 }
4215
4216 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
4217
4218 kfree(buf);
4219
4220 return ret;
4221}
4222#endif
4223
4224static const struct file_operations supply_map_fops = {
4225#ifdef CONFIG_DEBUG_FS
4226 .read = supply_map_read_file,
4227 .llseek = default_llseek,
4228#endif
4229};
4230
4231#ifdef CONFIG_DEBUG_FS
4232struct summary_data {
4233 struct seq_file *s;
4234 struct regulator_dev *parent;
4235 int level;
4236};
4237
4238static void regulator_summary_show_subtree(struct seq_file *s,
4239 struct regulator_dev *rdev,
4240 int level);
4241
4242static int regulator_summary_show_children(struct device *dev, void *data)
4243{
4244 struct regulator_dev *rdev = dev_to_rdev(dev);
4245 struct summary_data *summary_data = data;
4246
4247 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
4248 regulator_summary_show_subtree(summary_data->s, rdev,
4249 summary_data->level + 1);
4250
4251 return 0;
4252}
4253
4254static void regulator_summary_show_subtree(struct seq_file *s,
4255 struct regulator_dev *rdev,
4256 int level)
4257{
4258 struct regulation_constraints *c;
4259 struct regulator *consumer;
4260 struct summary_data summary_data;
4261
4262 if (!rdev)
4263 return;
4264
4265 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4266 level * 3 + 1, "",
4267 30 - level * 3, rdev_get_name(rdev),
4268 rdev->use_count, rdev->open_count, rdev->bypass_count);
4269
4270 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4271 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
4272
4273 c = rdev->constraints;
4274 if (c) {
4275 switch (rdev->desc->type) {
4276 case REGULATOR_VOLTAGE:
4277 seq_printf(s, "%5dmV %5dmV ",
4278 c->min_uV / 1000, c->max_uV / 1000);
4279 break;
4280 case REGULATOR_CURRENT:
4281 seq_printf(s, "%5dmA %5dmA ",
4282 c->min_uA / 1000, c->max_uA / 1000);
4283 break;
4284 }
4285 }
4286
4287 seq_puts(s, "\n");
4288
4289 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4290 if (consumer->dev->class == ®ulator_class)
4291 continue;
4292
4293 seq_printf(s, "%*s%-*s ",
4294 (level + 1) * 3 + 1, "",
4295 30 - (level + 1) * 3, dev_name(consumer->dev));
4296
4297 switch (rdev->desc->type) {
4298 case REGULATOR_VOLTAGE:
4299 seq_printf(s, "%37dmV %5dmV",
4300 consumer->min_uV / 1000,
4301 consumer->max_uV / 1000);
4302 break;
4303 case REGULATOR_CURRENT:
4304 break;
4305 }
4306
4307 seq_puts(s, "\n");
4308 }
4309
4310 summary_data.s = s;
4311 summary_data.level = level;
4312 summary_data.parent = rdev;
4313
4314 class_for_each_device(®ulator_class, NULL, &summary_data,
4315 regulator_summary_show_children);
4316}
4317
4318static int regulator_summary_show_roots(struct device *dev, void *data)
4319{
4320 struct regulator_dev *rdev = dev_to_rdev(dev);
4321 struct seq_file *s = data;
4322
4323 if (!rdev->supply)
4324 regulator_summary_show_subtree(s, rdev, 0);
4325
4326 return 0;
4327}
4328
4329static int regulator_summary_show(struct seq_file *s, void *data)
4330{
4331 seq_puts(s, " regulator use open bypass voltage current min max\n");
4332 seq_puts(s, "-------------------------------------------------------------------------------\n");
4333
4334 class_for_each_device(®ulator_class, NULL, s,
4335 regulator_summary_show_roots);
4336
4337 return 0;
4338}
4339
4340static int regulator_summary_open(struct inode *inode, struct file *file)
4341{
4342 return single_open(file, regulator_summary_show, inode->i_private);
4343}
4344#endif
4345
4346static const struct file_operations regulator_summary_fops = {
4347#ifdef CONFIG_DEBUG_FS
4348 .open = regulator_summary_open,
4349 .read = seq_read,
4350 .llseek = seq_lseek,
4351 .release = single_release,
4352#endif
4353};
4354
4355static int __init regulator_init(void)
4356{
4357 int ret;
4358
4359 ret = class_register(®ulator_class);
4360
4361 debugfs_root = debugfs_create_dir("regulator", NULL);
4362 if (!debugfs_root)
4363 pr_warn("regulator: Failed to create debugfs directory\n");
4364
4365 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4366 &supply_map_fops);
4367
4368 debugfs_create_file("regulator_summary", 0444, debugfs_root,
4369 NULL, ®ulator_summary_fops);
4370
4371 regulator_dummy_init();
4372
4373 return ret;
4374}
4375
4376/* init early to allow our consumers to complete system booting */
4377core_initcall(regulator_init);
4378
4379static int __init regulator_late_cleanup(struct device *dev, void *data)
4380{
4381 struct regulator_dev *rdev = dev_to_rdev(dev);
4382 const struct regulator_ops *ops = rdev->desc->ops;
4383 struct regulation_constraints *c = rdev->constraints;
4384 int enabled, ret;
4385
4386 if (c && c->always_on)
4387 return 0;
4388
4389 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
4390 return 0;
4391
4392 mutex_lock(&rdev->mutex);
4393
4394 if (rdev->use_count)
4395 goto unlock;
4396
4397 /* If we can't read the status assume it's on. */
4398 if (ops->is_enabled)
4399 enabled = ops->is_enabled(rdev);
4400 else
4401 enabled = 1;
4402
4403 if (!enabled)
4404 goto unlock;
4405
4406 if (have_full_constraints()) {
4407 /* We log since this may kill the system if it goes
4408 * wrong. */
4409 rdev_info(rdev, "disabling\n");
4410 ret = _regulator_do_disable(rdev);
4411 if (ret != 0)
4412 rdev_err(rdev, "couldn't disable: %d\n", ret);
4413 } else {
4414 /* The intention is that in future we will
4415 * assume that full constraints are provided
4416 * so warn even if we aren't going to do
4417 * anything here.
4418 */
4419 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4420 }
4421
4422unlock:
4423 mutex_unlock(&rdev->mutex);
4424
4425 return 0;
4426}
4427
4428static int __init regulator_init_complete(void)
4429{
4430 /*
4431 * Since DT doesn't provide an idiomatic mechanism for
4432 * enabling full constraints and since it's much more natural
4433 * with DT to provide them just assume that a DT enabled
4434 * system has full constraints.
4435 */
4436 if (of_have_populated_dt())
4437 has_full_constraints = true;
4438
4439 /* If we have a full configuration then disable any regulators
4440 * we have permission to change the status for and which are
4441 * not in use or always_on. This is effectively the default
4442 * for DT and ACPI as they have full constraints.
4443 */
4444 class_for_each_device(®ulator_class, NULL, NULL,
4445 regulator_late_cleanup);
4446
4447 return 0;
4448}
4449late_initcall_sync(regulator_init_complete);
1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
6 *
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/debugfs.h>
19#include <linux/device.h>
20#include <linux/slab.h>
21#include <linux/async.h>
22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
25#include <linux/delay.h>
26#include <linux/gpio.h>
27#include <linux/gpio/consumer.h>
28#include <linux/of.h>
29#include <linux/regmap.h>
30#include <linux/regulator/of_regulator.h>
31#include <linux/regulator/consumer.h>
32#include <linux/regulator/driver.h>
33#include <linux/regulator/machine.h>
34#include <linux/module.h>
35
36#define CREATE_TRACE_POINTS
37#include <trace/events/regulator.h>
38
39#include "dummy.h"
40#include "internal.h"
41
42#define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44#define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50#define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
52
53static DEFINE_MUTEX(regulator_list_mutex);
54static LIST_HEAD(regulator_map_list);
55static LIST_HEAD(regulator_ena_gpio_list);
56static LIST_HEAD(regulator_supply_alias_list);
57static bool has_full_constraints;
58
59static struct dentry *debugfs_root;
60
61static struct class regulator_class;
62
63/*
64 * struct regulator_map
65 *
66 * Used to provide symbolic supply names to devices.
67 */
68struct regulator_map {
69 struct list_head list;
70 const char *dev_name; /* The dev_name() for the consumer */
71 const char *supply;
72 struct regulator_dev *regulator;
73};
74
75/*
76 * struct regulator_enable_gpio
77 *
78 * Management for shared enable GPIO pin
79 */
80struct regulator_enable_gpio {
81 struct list_head list;
82 struct gpio_desc *gpiod;
83 u32 enable_count; /* a number of enabled shared GPIO */
84 u32 request_count; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert:1;
86};
87
88/*
89 * struct regulator_supply_alias
90 *
91 * Used to map lookups for a supply onto an alternative device.
92 */
93struct regulator_supply_alias {
94 struct list_head list;
95 struct device *src_dev;
96 const char *src_supply;
97 struct device *alias_dev;
98 const char *alias_supply;
99};
100
101static int _regulator_is_enabled(struct regulator_dev *rdev);
102static int _regulator_disable(struct regulator_dev *rdev);
103static int _regulator_get_voltage(struct regulator_dev *rdev);
104static int _regulator_get_current_limit(struct regulator_dev *rdev);
105static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
106static int _notifier_call_chain(struct regulator_dev *rdev,
107 unsigned long event, void *data);
108static int _regulator_do_set_voltage(struct regulator_dev *rdev,
109 int min_uV, int max_uV);
110static struct regulator *create_regulator(struct regulator_dev *rdev,
111 struct device *dev,
112 const char *supply_name);
113static void _regulator_put(struct regulator *regulator);
114
115static struct regulator_dev *dev_to_rdev(struct device *dev)
116{
117 return container_of(dev, struct regulator_dev, dev);
118}
119
120static const char *rdev_get_name(struct regulator_dev *rdev)
121{
122 if (rdev->constraints && rdev->constraints->name)
123 return rdev->constraints->name;
124 else if (rdev->desc->name)
125 return rdev->desc->name;
126 else
127 return "";
128}
129
130static bool have_full_constraints(void)
131{
132 return has_full_constraints || of_have_populated_dt();
133}
134
135static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops)
136{
137 if (!rdev->constraints) {
138 rdev_err(rdev, "no constraints\n");
139 return false;
140 }
141
142 if (rdev->constraints->valid_ops_mask & ops)
143 return true;
144
145 return false;
146}
147
148static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev)
149{
150 if (rdev && rdev->supply)
151 return rdev->supply->rdev;
152
153 return NULL;
154}
155
156/**
157 * regulator_lock_supply - lock a regulator and its supplies
158 * @rdev: regulator source
159 */
160static void regulator_lock_supply(struct regulator_dev *rdev)
161{
162 int i;
163
164 for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++)
165 mutex_lock_nested(&rdev->mutex, i);
166}
167
168/**
169 * regulator_unlock_supply - unlock a regulator and its supplies
170 * @rdev: regulator source
171 */
172static void regulator_unlock_supply(struct regulator_dev *rdev)
173{
174 struct regulator *supply;
175
176 while (1) {
177 mutex_unlock(&rdev->mutex);
178 supply = rdev->supply;
179
180 if (!rdev->supply)
181 return;
182
183 rdev = supply->rdev;
184 }
185}
186
187/**
188 * of_get_regulator - get a regulator device node based on supply name
189 * @dev: Device pointer for the consumer (of regulator) device
190 * @supply: regulator supply name
191 *
192 * Extract the regulator device node corresponding to the supply name.
193 * returns the device node corresponding to the regulator if found, else
194 * returns NULL.
195 */
196static struct device_node *of_get_regulator(struct device *dev, const char *supply)
197{
198 struct device_node *regnode = NULL;
199 char prop_name[32]; /* 32 is max size of property name */
200
201 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
202
203 snprintf(prop_name, 32, "%s-supply", supply);
204 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
205
206 if (!regnode) {
207 dev_dbg(dev, "Looking up %s property in node %s failed\n",
208 prop_name, dev->of_node->full_name);
209 return NULL;
210 }
211 return regnode;
212}
213
214/* Platform voltage constraint check */
215static int regulator_check_voltage(struct regulator_dev *rdev,
216 int *min_uV, int *max_uV)
217{
218 BUG_ON(*min_uV > *max_uV);
219
220 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
221 rdev_err(rdev, "voltage operation not allowed\n");
222 return -EPERM;
223 }
224
225 if (*max_uV > rdev->constraints->max_uV)
226 *max_uV = rdev->constraints->max_uV;
227 if (*min_uV < rdev->constraints->min_uV)
228 *min_uV = rdev->constraints->min_uV;
229
230 if (*min_uV > *max_uV) {
231 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
232 *min_uV, *max_uV);
233 return -EINVAL;
234 }
235
236 return 0;
237}
238
239/* Make sure we select a voltage that suits the needs of all
240 * regulator consumers
241 */
242static int regulator_check_consumers(struct regulator_dev *rdev,
243 int *min_uV, int *max_uV)
244{
245 struct regulator *regulator;
246
247 list_for_each_entry(regulator, &rdev->consumer_list, list) {
248 /*
249 * Assume consumers that didn't say anything are OK
250 * with anything in the constraint range.
251 */
252 if (!regulator->min_uV && !regulator->max_uV)
253 continue;
254
255 if (*max_uV > regulator->max_uV)
256 *max_uV = regulator->max_uV;
257 if (*min_uV < regulator->min_uV)
258 *min_uV = regulator->min_uV;
259 }
260
261 if (*min_uV > *max_uV) {
262 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
263 *min_uV, *max_uV);
264 return -EINVAL;
265 }
266
267 return 0;
268}
269
270/* current constraint check */
271static int regulator_check_current_limit(struct regulator_dev *rdev,
272 int *min_uA, int *max_uA)
273{
274 BUG_ON(*min_uA > *max_uA);
275
276 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) {
277 rdev_err(rdev, "current operation not allowed\n");
278 return -EPERM;
279 }
280
281 if (*max_uA > rdev->constraints->max_uA)
282 *max_uA = rdev->constraints->max_uA;
283 if (*min_uA < rdev->constraints->min_uA)
284 *min_uA = rdev->constraints->min_uA;
285
286 if (*min_uA > *max_uA) {
287 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
288 *min_uA, *max_uA);
289 return -EINVAL;
290 }
291
292 return 0;
293}
294
295/* operating mode constraint check */
296static int regulator_mode_constrain(struct regulator_dev *rdev,
297 unsigned int *mode)
298{
299 switch (*mode) {
300 case REGULATOR_MODE_FAST:
301 case REGULATOR_MODE_NORMAL:
302 case REGULATOR_MODE_IDLE:
303 case REGULATOR_MODE_STANDBY:
304 break;
305 default:
306 rdev_err(rdev, "invalid mode %x specified\n", *mode);
307 return -EINVAL;
308 }
309
310 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) {
311 rdev_err(rdev, "mode operation not allowed\n");
312 return -EPERM;
313 }
314
315 /* The modes are bitmasks, the most power hungry modes having
316 * the lowest values. If the requested mode isn't supported
317 * try higher modes. */
318 while (*mode) {
319 if (rdev->constraints->valid_modes_mask & *mode)
320 return 0;
321 *mode /= 2;
322 }
323
324 return -EINVAL;
325}
326
327static ssize_t regulator_uV_show(struct device *dev,
328 struct device_attribute *attr, char *buf)
329{
330 struct regulator_dev *rdev = dev_get_drvdata(dev);
331 ssize_t ret;
332
333 mutex_lock(&rdev->mutex);
334 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
335 mutex_unlock(&rdev->mutex);
336
337 return ret;
338}
339static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
340
341static ssize_t regulator_uA_show(struct device *dev,
342 struct device_attribute *attr, char *buf)
343{
344 struct regulator_dev *rdev = dev_get_drvdata(dev);
345
346 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
347}
348static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
349
350static ssize_t name_show(struct device *dev, struct device_attribute *attr,
351 char *buf)
352{
353 struct regulator_dev *rdev = dev_get_drvdata(dev);
354
355 return sprintf(buf, "%s\n", rdev_get_name(rdev));
356}
357static DEVICE_ATTR_RO(name);
358
359static ssize_t regulator_print_opmode(char *buf, int mode)
360{
361 switch (mode) {
362 case REGULATOR_MODE_FAST:
363 return sprintf(buf, "fast\n");
364 case REGULATOR_MODE_NORMAL:
365 return sprintf(buf, "normal\n");
366 case REGULATOR_MODE_IDLE:
367 return sprintf(buf, "idle\n");
368 case REGULATOR_MODE_STANDBY:
369 return sprintf(buf, "standby\n");
370 }
371 return sprintf(buf, "unknown\n");
372}
373
374static ssize_t regulator_opmode_show(struct device *dev,
375 struct device_attribute *attr, char *buf)
376{
377 struct regulator_dev *rdev = dev_get_drvdata(dev);
378
379 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
380}
381static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
382
383static ssize_t regulator_print_state(char *buf, int state)
384{
385 if (state > 0)
386 return sprintf(buf, "enabled\n");
387 else if (state == 0)
388 return sprintf(buf, "disabled\n");
389 else
390 return sprintf(buf, "unknown\n");
391}
392
393static ssize_t regulator_state_show(struct device *dev,
394 struct device_attribute *attr, char *buf)
395{
396 struct regulator_dev *rdev = dev_get_drvdata(dev);
397 ssize_t ret;
398
399 mutex_lock(&rdev->mutex);
400 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
401 mutex_unlock(&rdev->mutex);
402
403 return ret;
404}
405static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
406
407static ssize_t regulator_status_show(struct device *dev,
408 struct device_attribute *attr, char *buf)
409{
410 struct regulator_dev *rdev = dev_get_drvdata(dev);
411 int status;
412 char *label;
413
414 status = rdev->desc->ops->get_status(rdev);
415 if (status < 0)
416 return status;
417
418 switch (status) {
419 case REGULATOR_STATUS_OFF:
420 label = "off";
421 break;
422 case REGULATOR_STATUS_ON:
423 label = "on";
424 break;
425 case REGULATOR_STATUS_ERROR:
426 label = "error";
427 break;
428 case REGULATOR_STATUS_FAST:
429 label = "fast";
430 break;
431 case REGULATOR_STATUS_NORMAL:
432 label = "normal";
433 break;
434 case REGULATOR_STATUS_IDLE:
435 label = "idle";
436 break;
437 case REGULATOR_STATUS_STANDBY:
438 label = "standby";
439 break;
440 case REGULATOR_STATUS_BYPASS:
441 label = "bypass";
442 break;
443 case REGULATOR_STATUS_UNDEFINED:
444 label = "undefined";
445 break;
446 default:
447 return -ERANGE;
448 }
449
450 return sprintf(buf, "%s\n", label);
451}
452static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
453
454static ssize_t regulator_min_uA_show(struct device *dev,
455 struct device_attribute *attr, char *buf)
456{
457 struct regulator_dev *rdev = dev_get_drvdata(dev);
458
459 if (!rdev->constraints)
460 return sprintf(buf, "constraint not defined\n");
461
462 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
463}
464static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
465
466static ssize_t regulator_max_uA_show(struct device *dev,
467 struct device_attribute *attr, char *buf)
468{
469 struct regulator_dev *rdev = dev_get_drvdata(dev);
470
471 if (!rdev->constraints)
472 return sprintf(buf, "constraint not defined\n");
473
474 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
475}
476static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
477
478static ssize_t regulator_min_uV_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
480{
481 struct regulator_dev *rdev = dev_get_drvdata(dev);
482
483 if (!rdev->constraints)
484 return sprintf(buf, "constraint not defined\n");
485
486 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
487}
488static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
489
490static ssize_t regulator_max_uV_show(struct device *dev,
491 struct device_attribute *attr, char *buf)
492{
493 struct regulator_dev *rdev = dev_get_drvdata(dev);
494
495 if (!rdev->constraints)
496 return sprintf(buf, "constraint not defined\n");
497
498 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
499}
500static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
501
502static ssize_t regulator_total_uA_show(struct device *dev,
503 struct device_attribute *attr, char *buf)
504{
505 struct regulator_dev *rdev = dev_get_drvdata(dev);
506 struct regulator *regulator;
507 int uA = 0;
508
509 mutex_lock(&rdev->mutex);
510 list_for_each_entry(regulator, &rdev->consumer_list, list)
511 uA += regulator->uA_load;
512 mutex_unlock(&rdev->mutex);
513 return sprintf(buf, "%d\n", uA);
514}
515static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
516
517static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
518 char *buf)
519{
520 struct regulator_dev *rdev = dev_get_drvdata(dev);
521 return sprintf(buf, "%d\n", rdev->use_count);
522}
523static DEVICE_ATTR_RO(num_users);
524
525static ssize_t type_show(struct device *dev, struct device_attribute *attr,
526 char *buf)
527{
528 struct regulator_dev *rdev = dev_get_drvdata(dev);
529
530 switch (rdev->desc->type) {
531 case REGULATOR_VOLTAGE:
532 return sprintf(buf, "voltage\n");
533 case REGULATOR_CURRENT:
534 return sprintf(buf, "current\n");
535 }
536 return sprintf(buf, "unknown\n");
537}
538static DEVICE_ATTR_RO(type);
539
540static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
541 struct device_attribute *attr, char *buf)
542{
543 struct regulator_dev *rdev = dev_get_drvdata(dev);
544
545 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
546}
547static DEVICE_ATTR(suspend_mem_microvolts, 0444,
548 regulator_suspend_mem_uV_show, NULL);
549
550static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
551 struct device_attribute *attr, char *buf)
552{
553 struct regulator_dev *rdev = dev_get_drvdata(dev);
554
555 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
556}
557static DEVICE_ATTR(suspend_disk_microvolts, 0444,
558 regulator_suspend_disk_uV_show, NULL);
559
560static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
561 struct device_attribute *attr, char *buf)
562{
563 struct regulator_dev *rdev = dev_get_drvdata(dev);
564
565 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
566}
567static DEVICE_ATTR(suspend_standby_microvolts, 0444,
568 regulator_suspend_standby_uV_show, NULL);
569
570static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
571 struct device_attribute *attr, char *buf)
572{
573 struct regulator_dev *rdev = dev_get_drvdata(dev);
574
575 return regulator_print_opmode(buf,
576 rdev->constraints->state_mem.mode);
577}
578static DEVICE_ATTR(suspend_mem_mode, 0444,
579 regulator_suspend_mem_mode_show, NULL);
580
581static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
582 struct device_attribute *attr, char *buf)
583{
584 struct regulator_dev *rdev = dev_get_drvdata(dev);
585
586 return regulator_print_opmode(buf,
587 rdev->constraints->state_disk.mode);
588}
589static DEVICE_ATTR(suspend_disk_mode, 0444,
590 regulator_suspend_disk_mode_show, NULL);
591
592static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
593 struct device_attribute *attr, char *buf)
594{
595 struct regulator_dev *rdev = dev_get_drvdata(dev);
596
597 return regulator_print_opmode(buf,
598 rdev->constraints->state_standby.mode);
599}
600static DEVICE_ATTR(suspend_standby_mode, 0444,
601 regulator_suspend_standby_mode_show, NULL);
602
603static ssize_t regulator_suspend_mem_state_show(struct device *dev,
604 struct device_attribute *attr, char *buf)
605{
606 struct regulator_dev *rdev = dev_get_drvdata(dev);
607
608 return regulator_print_state(buf,
609 rdev->constraints->state_mem.enabled);
610}
611static DEVICE_ATTR(suspend_mem_state, 0444,
612 regulator_suspend_mem_state_show, NULL);
613
614static ssize_t regulator_suspend_disk_state_show(struct device *dev,
615 struct device_attribute *attr, char *buf)
616{
617 struct regulator_dev *rdev = dev_get_drvdata(dev);
618
619 return regulator_print_state(buf,
620 rdev->constraints->state_disk.enabled);
621}
622static DEVICE_ATTR(suspend_disk_state, 0444,
623 regulator_suspend_disk_state_show, NULL);
624
625static ssize_t regulator_suspend_standby_state_show(struct device *dev,
626 struct device_attribute *attr, char *buf)
627{
628 struct regulator_dev *rdev = dev_get_drvdata(dev);
629
630 return regulator_print_state(buf,
631 rdev->constraints->state_standby.enabled);
632}
633static DEVICE_ATTR(suspend_standby_state, 0444,
634 regulator_suspend_standby_state_show, NULL);
635
636static ssize_t regulator_bypass_show(struct device *dev,
637 struct device_attribute *attr, char *buf)
638{
639 struct regulator_dev *rdev = dev_get_drvdata(dev);
640 const char *report;
641 bool bypass;
642 int ret;
643
644 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
645
646 if (ret != 0)
647 report = "unknown";
648 else if (bypass)
649 report = "enabled";
650 else
651 report = "disabled";
652
653 return sprintf(buf, "%s\n", report);
654}
655static DEVICE_ATTR(bypass, 0444,
656 regulator_bypass_show, NULL);
657
658/* Calculate the new optimum regulator operating mode based on the new total
659 * consumer load. All locks held by caller */
660static int drms_uA_update(struct regulator_dev *rdev)
661{
662 struct regulator *sibling;
663 int current_uA = 0, output_uV, input_uV, err;
664 unsigned int mode;
665
666 lockdep_assert_held_once(&rdev->mutex);
667
668 /*
669 * first check to see if we can set modes at all, otherwise just
670 * tell the consumer everything is OK.
671 */
672 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
673 return 0;
674
675 if (!rdev->desc->ops->get_optimum_mode &&
676 !rdev->desc->ops->set_load)
677 return 0;
678
679 if (!rdev->desc->ops->set_mode &&
680 !rdev->desc->ops->set_load)
681 return -EINVAL;
682
683 /* calc total requested load */
684 list_for_each_entry(sibling, &rdev->consumer_list, list)
685 current_uA += sibling->uA_load;
686
687 current_uA += rdev->constraints->system_load;
688
689 if (rdev->desc->ops->set_load) {
690 /* set the optimum mode for our new total regulator load */
691 err = rdev->desc->ops->set_load(rdev, current_uA);
692 if (err < 0)
693 rdev_err(rdev, "failed to set load %d\n", current_uA);
694 } else {
695 /* get output voltage */
696 output_uV = _regulator_get_voltage(rdev);
697 if (output_uV <= 0) {
698 rdev_err(rdev, "invalid output voltage found\n");
699 return -EINVAL;
700 }
701
702 /* get input voltage */
703 input_uV = 0;
704 if (rdev->supply)
705 input_uV = regulator_get_voltage(rdev->supply);
706 if (input_uV <= 0)
707 input_uV = rdev->constraints->input_uV;
708 if (input_uV <= 0) {
709 rdev_err(rdev, "invalid input voltage found\n");
710 return -EINVAL;
711 }
712
713 /* now get the optimum mode for our new total regulator load */
714 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
715 output_uV, current_uA);
716
717 /* check the new mode is allowed */
718 err = regulator_mode_constrain(rdev, &mode);
719 if (err < 0) {
720 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
721 current_uA, input_uV, output_uV);
722 return err;
723 }
724
725 err = rdev->desc->ops->set_mode(rdev, mode);
726 if (err < 0)
727 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
728 }
729
730 return err;
731}
732
733static int suspend_set_state(struct regulator_dev *rdev,
734 struct regulator_state *rstate)
735{
736 int ret = 0;
737
738 /* If we have no suspend mode configration don't set anything;
739 * only warn if the driver implements set_suspend_voltage or
740 * set_suspend_mode callback.
741 */
742 if (!rstate->enabled && !rstate->disabled) {
743 if (rdev->desc->ops->set_suspend_voltage ||
744 rdev->desc->ops->set_suspend_mode)
745 rdev_warn(rdev, "No configuration\n");
746 return 0;
747 }
748
749 if (rstate->enabled && rstate->disabled) {
750 rdev_err(rdev, "invalid configuration\n");
751 return -EINVAL;
752 }
753
754 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
755 ret = rdev->desc->ops->set_suspend_enable(rdev);
756 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
757 ret = rdev->desc->ops->set_suspend_disable(rdev);
758 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
759 ret = 0;
760
761 if (ret < 0) {
762 rdev_err(rdev, "failed to enabled/disable\n");
763 return ret;
764 }
765
766 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
767 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
768 if (ret < 0) {
769 rdev_err(rdev, "failed to set voltage\n");
770 return ret;
771 }
772 }
773
774 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
775 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
776 if (ret < 0) {
777 rdev_err(rdev, "failed to set mode\n");
778 return ret;
779 }
780 }
781 return ret;
782}
783
784/* locks held by caller */
785static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
786{
787 if (!rdev->constraints)
788 return -EINVAL;
789
790 switch (state) {
791 case PM_SUSPEND_STANDBY:
792 return suspend_set_state(rdev,
793 &rdev->constraints->state_standby);
794 case PM_SUSPEND_MEM:
795 return suspend_set_state(rdev,
796 &rdev->constraints->state_mem);
797 case PM_SUSPEND_MAX:
798 return suspend_set_state(rdev,
799 &rdev->constraints->state_disk);
800 default:
801 return -EINVAL;
802 }
803}
804
805static void print_constraints(struct regulator_dev *rdev)
806{
807 struct regulation_constraints *constraints = rdev->constraints;
808 char buf[160] = "";
809 size_t len = sizeof(buf) - 1;
810 int count = 0;
811 int ret;
812
813 if (constraints->min_uV && constraints->max_uV) {
814 if (constraints->min_uV == constraints->max_uV)
815 count += scnprintf(buf + count, len - count, "%d mV ",
816 constraints->min_uV / 1000);
817 else
818 count += scnprintf(buf + count, len - count,
819 "%d <--> %d mV ",
820 constraints->min_uV / 1000,
821 constraints->max_uV / 1000);
822 }
823
824 if (!constraints->min_uV ||
825 constraints->min_uV != constraints->max_uV) {
826 ret = _regulator_get_voltage(rdev);
827 if (ret > 0)
828 count += scnprintf(buf + count, len - count,
829 "at %d mV ", ret / 1000);
830 }
831
832 if (constraints->uV_offset)
833 count += scnprintf(buf + count, len - count, "%dmV offset ",
834 constraints->uV_offset / 1000);
835
836 if (constraints->min_uA && constraints->max_uA) {
837 if (constraints->min_uA == constraints->max_uA)
838 count += scnprintf(buf + count, len - count, "%d mA ",
839 constraints->min_uA / 1000);
840 else
841 count += scnprintf(buf + count, len - count,
842 "%d <--> %d mA ",
843 constraints->min_uA / 1000,
844 constraints->max_uA / 1000);
845 }
846
847 if (!constraints->min_uA ||
848 constraints->min_uA != constraints->max_uA) {
849 ret = _regulator_get_current_limit(rdev);
850 if (ret > 0)
851 count += scnprintf(buf + count, len - count,
852 "at %d mA ", ret / 1000);
853 }
854
855 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
856 count += scnprintf(buf + count, len - count, "fast ");
857 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
858 count += scnprintf(buf + count, len - count, "normal ");
859 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
860 count += scnprintf(buf + count, len - count, "idle ");
861 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
862 count += scnprintf(buf + count, len - count, "standby");
863
864 if (!count)
865 scnprintf(buf, len, "no parameters");
866
867 rdev_dbg(rdev, "%s\n", buf);
868
869 if ((constraints->min_uV != constraints->max_uV) &&
870 !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE))
871 rdev_warn(rdev,
872 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
873}
874
875static int machine_constraints_voltage(struct regulator_dev *rdev,
876 struct regulation_constraints *constraints)
877{
878 const struct regulator_ops *ops = rdev->desc->ops;
879 int ret;
880
881 /* do we need to apply the constraint voltage */
882 if (rdev->constraints->apply_uV &&
883 rdev->constraints->min_uV && rdev->constraints->max_uV) {
884 int target_min, target_max;
885 int current_uV = _regulator_get_voltage(rdev);
886 if (current_uV < 0) {
887 rdev_err(rdev,
888 "failed to get the current voltage(%d)\n",
889 current_uV);
890 return current_uV;
891 }
892
893 /*
894 * If we're below the minimum voltage move up to the
895 * minimum voltage, if we're above the maximum voltage
896 * then move down to the maximum.
897 */
898 target_min = current_uV;
899 target_max = current_uV;
900
901 if (current_uV < rdev->constraints->min_uV) {
902 target_min = rdev->constraints->min_uV;
903 target_max = rdev->constraints->min_uV;
904 }
905
906 if (current_uV > rdev->constraints->max_uV) {
907 target_min = rdev->constraints->max_uV;
908 target_max = rdev->constraints->max_uV;
909 }
910
911 if (target_min != current_uV || target_max != current_uV) {
912 rdev_info(rdev, "Bringing %duV into %d-%duV\n",
913 current_uV, target_min, target_max);
914 ret = _regulator_do_set_voltage(
915 rdev, target_min, target_max);
916 if (ret < 0) {
917 rdev_err(rdev,
918 "failed to apply %d-%duV constraint(%d)\n",
919 target_min, target_max, ret);
920 return ret;
921 }
922 }
923 }
924
925 /* constrain machine-level voltage specs to fit
926 * the actual range supported by this regulator.
927 */
928 if (ops->list_voltage && rdev->desc->n_voltages) {
929 int count = rdev->desc->n_voltages;
930 int i;
931 int min_uV = INT_MAX;
932 int max_uV = INT_MIN;
933 int cmin = constraints->min_uV;
934 int cmax = constraints->max_uV;
935
936 /* it's safe to autoconfigure fixed-voltage supplies
937 and the constraints are used by list_voltage. */
938 if (count == 1 && !cmin) {
939 cmin = 1;
940 cmax = INT_MAX;
941 constraints->min_uV = cmin;
942 constraints->max_uV = cmax;
943 }
944
945 /* voltage constraints are optional */
946 if ((cmin == 0) && (cmax == 0))
947 return 0;
948
949 /* else require explicit machine-level constraints */
950 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
951 rdev_err(rdev, "invalid voltage constraints\n");
952 return -EINVAL;
953 }
954
955 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
956 for (i = 0; i < count; i++) {
957 int value;
958
959 value = ops->list_voltage(rdev, i);
960 if (value <= 0)
961 continue;
962
963 /* maybe adjust [min_uV..max_uV] */
964 if (value >= cmin && value < min_uV)
965 min_uV = value;
966 if (value <= cmax && value > max_uV)
967 max_uV = value;
968 }
969
970 /* final: [min_uV..max_uV] valid iff constraints valid */
971 if (max_uV < min_uV) {
972 rdev_err(rdev,
973 "unsupportable voltage constraints %u-%uuV\n",
974 min_uV, max_uV);
975 return -EINVAL;
976 }
977
978 /* use regulator's subset of machine constraints */
979 if (constraints->min_uV < min_uV) {
980 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
981 constraints->min_uV, min_uV);
982 constraints->min_uV = min_uV;
983 }
984 if (constraints->max_uV > max_uV) {
985 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
986 constraints->max_uV, max_uV);
987 constraints->max_uV = max_uV;
988 }
989 }
990
991 return 0;
992}
993
994static int machine_constraints_current(struct regulator_dev *rdev,
995 struct regulation_constraints *constraints)
996{
997 const struct regulator_ops *ops = rdev->desc->ops;
998 int ret;
999
1000 if (!constraints->min_uA && !constraints->max_uA)
1001 return 0;
1002
1003 if (constraints->min_uA > constraints->max_uA) {
1004 rdev_err(rdev, "Invalid current constraints\n");
1005 return -EINVAL;
1006 }
1007
1008 if (!ops->set_current_limit || !ops->get_current_limit) {
1009 rdev_warn(rdev, "Operation of current configuration missing\n");
1010 return 0;
1011 }
1012
1013 /* Set regulator current in constraints range */
1014 ret = ops->set_current_limit(rdev, constraints->min_uA,
1015 constraints->max_uA);
1016 if (ret < 0) {
1017 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1018 return ret;
1019 }
1020
1021 return 0;
1022}
1023
1024static int _regulator_do_enable(struct regulator_dev *rdev);
1025
1026/**
1027 * set_machine_constraints - sets regulator constraints
1028 * @rdev: regulator source
1029 * @constraints: constraints to apply
1030 *
1031 * Allows platform initialisation code to define and constrain
1032 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1033 * Constraints *must* be set by platform code in order for some
1034 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1035 * set_mode.
1036 */
1037static int set_machine_constraints(struct regulator_dev *rdev,
1038 const struct regulation_constraints *constraints)
1039{
1040 int ret = 0;
1041 const struct regulator_ops *ops = rdev->desc->ops;
1042
1043 if (constraints)
1044 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1045 GFP_KERNEL);
1046 else
1047 rdev->constraints = kzalloc(sizeof(*constraints),
1048 GFP_KERNEL);
1049 if (!rdev->constraints)
1050 return -ENOMEM;
1051
1052 ret = machine_constraints_voltage(rdev, rdev->constraints);
1053 if (ret != 0)
1054 return ret;
1055
1056 ret = machine_constraints_current(rdev, rdev->constraints);
1057 if (ret != 0)
1058 return ret;
1059
1060 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1061 ret = ops->set_input_current_limit(rdev,
1062 rdev->constraints->ilim_uA);
1063 if (ret < 0) {
1064 rdev_err(rdev, "failed to set input limit\n");
1065 return ret;
1066 }
1067 }
1068
1069 /* do we need to setup our suspend state */
1070 if (rdev->constraints->initial_state) {
1071 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1072 if (ret < 0) {
1073 rdev_err(rdev, "failed to set suspend state\n");
1074 return ret;
1075 }
1076 }
1077
1078 if (rdev->constraints->initial_mode) {
1079 if (!ops->set_mode) {
1080 rdev_err(rdev, "no set_mode operation\n");
1081 return -EINVAL;
1082 }
1083
1084 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1085 if (ret < 0) {
1086 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1087 return ret;
1088 }
1089 }
1090
1091 /* If the constraints say the regulator should be on at this point
1092 * and we have control then make sure it is enabled.
1093 */
1094 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1095 ret = _regulator_do_enable(rdev);
1096 if (ret < 0 && ret != -EINVAL) {
1097 rdev_err(rdev, "failed to enable\n");
1098 return ret;
1099 }
1100 }
1101
1102 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1103 && ops->set_ramp_delay) {
1104 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1105 if (ret < 0) {
1106 rdev_err(rdev, "failed to set ramp_delay\n");
1107 return ret;
1108 }
1109 }
1110
1111 if (rdev->constraints->pull_down && ops->set_pull_down) {
1112 ret = ops->set_pull_down(rdev);
1113 if (ret < 0) {
1114 rdev_err(rdev, "failed to set pull down\n");
1115 return ret;
1116 }
1117 }
1118
1119 if (rdev->constraints->soft_start && ops->set_soft_start) {
1120 ret = ops->set_soft_start(rdev);
1121 if (ret < 0) {
1122 rdev_err(rdev, "failed to set soft start\n");
1123 return ret;
1124 }
1125 }
1126
1127 if (rdev->constraints->over_current_protection
1128 && ops->set_over_current_protection) {
1129 ret = ops->set_over_current_protection(rdev);
1130 if (ret < 0) {
1131 rdev_err(rdev, "failed to set over current protection\n");
1132 return ret;
1133 }
1134 }
1135
1136 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1137 bool ad_state = (rdev->constraints->active_discharge ==
1138 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1139
1140 ret = ops->set_active_discharge(rdev, ad_state);
1141 if (ret < 0) {
1142 rdev_err(rdev, "failed to set active discharge\n");
1143 return ret;
1144 }
1145 }
1146
1147 print_constraints(rdev);
1148 return 0;
1149}
1150
1151/**
1152 * set_supply - set regulator supply regulator
1153 * @rdev: regulator name
1154 * @supply_rdev: supply regulator name
1155 *
1156 * Called by platform initialisation code to set the supply regulator for this
1157 * regulator. This ensures that a regulators supply will also be enabled by the
1158 * core if it's child is enabled.
1159 */
1160static int set_supply(struct regulator_dev *rdev,
1161 struct regulator_dev *supply_rdev)
1162{
1163 int err;
1164
1165 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1166
1167 if (!try_module_get(supply_rdev->owner))
1168 return -ENODEV;
1169
1170 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1171 if (rdev->supply == NULL) {
1172 err = -ENOMEM;
1173 return err;
1174 }
1175 supply_rdev->open_count++;
1176
1177 return 0;
1178}
1179
1180/**
1181 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1182 * @rdev: regulator source
1183 * @consumer_dev_name: dev_name() string for device supply applies to
1184 * @supply: symbolic name for supply
1185 *
1186 * Allows platform initialisation code to map physical regulator
1187 * sources to symbolic names for supplies for use by devices. Devices
1188 * should use these symbolic names to request regulators, avoiding the
1189 * need to provide board-specific regulator names as platform data.
1190 */
1191static int set_consumer_device_supply(struct regulator_dev *rdev,
1192 const char *consumer_dev_name,
1193 const char *supply)
1194{
1195 struct regulator_map *node;
1196 int has_dev;
1197
1198 if (supply == NULL)
1199 return -EINVAL;
1200
1201 if (consumer_dev_name != NULL)
1202 has_dev = 1;
1203 else
1204 has_dev = 0;
1205
1206 list_for_each_entry(node, ®ulator_map_list, list) {
1207 if (node->dev_name && consumer_dev_name) {
1208 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1209 continue;
1210 } else if (node->dev_name || consumer_dev_name) {
1211 continue;
1212 }
1213
1214 if (strcmp(node->supply, supply) != 0)
1215 continue;
1216
1217 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1218 consumer_dev_name,
1219 dev_name(&node->regulator->dev),
1220 node->regulator->desc->name,
1221 supply,
1222 dev_name(&rdev->dev), rdev_get_name(rdev));
1223 return -EBUSY;
1224 }
1225
1226 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1227 if (node == NULL)
1228 return -ENOMEM;
1229
1230 node->regulator = rdev;
1231 node->supply = supply;
1232
1233 if (has_dev) {
1234 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1235 if (node->dev_name == NULL) {
1236 kfree(node);
1237 return -ENOMEM;
1238 }
1239 }
1240
1241 list_add(&node->list, ®ulator_map_list);
1242 return 0;
1243}
1244
1245static void unset_regulator_supplies(struct regulator_dev *rdev)
1246{
1247 struct regulator_map *node, *n;
1248
1249 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1250 if (rdev == node->regulator) {
1251 list_del(&node->list);
1252 kfree(node->dev_name);
1253 kfree(node);
1254 }
1255 }
1256}
1257
1258#ifdef CONFIG_DEBUG_FS
1259static ssize_t constraint_flags_read_file(struct file *file,
1260 char __user *user_buf,
1261 size_t count, loff_t *ppos)
1262{
1263 const struct regulator *regulator = file->private_data;
1264 const struct regulation_constraints *c = regulator->rdev->constraints;
1265 char *buf;
1266 ssize_t ret;
1267
1268 if (!c)
1269 return 0;
1270
1271 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1272 if (!buf)
1273 return -ENOMEM;
1274
1275 ret = snprintf(buf, PAGE_SIZE,
1276 "always_on: %u\n"
1277 "boot_on: %u\n"
1278 "apply_uV: %u\n"
1279 "ramp_disable: %u\n"
1280 "soft_start: %u\n"
1281 "pull_down: %u\n"
1282 "over_current_protection: %u\n",
1283 c->always_on,
1284 c->boot_on,
1285 c->apply_uV,
1286 c->ramp_disable,
1287 c->soft_start,
1288 c->pull_down,
1289 c->over_current_protection);
1290
1291 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1292 kfree(buf);
1293
1294 return ret;
1295}
1296
1297#endif
1298
1299static const struct file_operations constraint_flags_fops = {
1300#ifdef CONFIG_DEBUG_FS
1301 .open = simple_open,
1302 .read = constraint_flags_read_file,
1303 .llseek = default_llseek,
1304#endif
1305};
1306
1307#define REG_STR_SIZE 64
1308
1309static struct regulator *create_regulator(struct regulator_dev *rdev,
1310 struct device *dev,
1311 const char *supply_name)
1312{
1313 struct regulator *regulator;
1314 char buf[REG_STR_SIZE];
1315 int err, size;
1316
1317 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1318 if (regulator == NULL)
1319 return NULL;
1320
1321 mutex_lock(&rdev->mutex);
1322 regulator->rdev = rdev;
1323 list_add(®ulator->list, &rdev->consumer_list);
1324
1325 if (dev) {
1326 regulator->dev = dev;
1327
1328 /* Add a link to the device sysfs entry */
1329 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1330 dev->kobj.name, supply_name);
1331 if (size >= REG_STR_SIZE)
1332 goto overflow_err;
1333
1334 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1335 if (regulator->supply_name == NULL)
1336 goto overflow_err;
1337
1338 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1339 buf);
1340 if (err) {
1341 rdev_dbg(rdev, "could not add device link %s err %d\n",
1342 dev->kobj.name, err);
1343 /* non-fatal */
1344 }
1345 } else {
1346 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1347 if (regulator->supply_name == NULL)
1348 goto overflow_err;
1349 }
1350
1351 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1352 rdev->debugfs);
1353 if (!regulator->debugfs) {
1354 rdev_dbg(rdev, "Failed to create debugfs directory\n");
1355 } else {
1356 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1357 ®ulator->uA_load);
1358 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1359 ®ulator->min_uV);
1360 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1361 ®ulator->max_uV);
1362 debugfs_create_file("constraint_flags", 0444,
1363 regulator->debugfs, regulator,
1364 &constraint_flags_fops);
1365 }
1366
1367 /*
1368 * Check now if the regulator is an always on regulator - if
1369 * it is then we don't need to do nearly so much work for
1370 * enable/disable calls.
1371 */
1372 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) &&
1373 _regulator_is_enabled(rdev))
1374 regulator->always_on = true;
1375
1376 mutex_unlock(&rdev->mutex);
1377 return regulator;
1378overflow_err:
1379 list_del(®ulator->list);
1380 kfree(regulator);
1381 mutex_unlock(&rdev->mutex);
1382 return NULL;
1383}
1384
1385static int _regulator_get_enable_time(struct regulator_dev *rdev)
1386{
1387 if (rdev->constraints && rdev->constraints->enable_time)
1388 return rdev->constraints->enable_time;
1389 if (!rdev->desc->ops->enable_time)
1390 return rdev->desc->enable_time;
1391 return rdev->desc->ops->enable_time(rdev);
1392}
1393
1394static struct regulator_supply_alias *regulator_find_supply_alias(
1395 struct device *dev, const char *supply)
1396{
1397 struct regulator_supply_alias *map;
1398
1399 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1400 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1401 return map;
1402
1403 return NULL;
1404}
1405
1406static void regulator_supply_alias(struct device **dev, const char **supply)
1407{
1408 struct regulator_supply_alias *map;
1409
1410 map = regulator_find_supply_alias(*dev, *supply);
1411 if (map) {
1412 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1413 *supply, map->alias_supply,
1414 dev_name(map->alias_dev));
1415 *dev = map->alias_dev;
1416 *supply = map->alias_supply;
1417 }
1418}
1419
1420static int of_node_match(struct device *dev, const void *data)
1421{
1422 return dev->of_node == data;
1423}
1424
1425static struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
1426{
1427 struct device *dev;
1428
1429 dev = class_find_device(®ulator_class, NULL, np, of_node_match);
1430
1431 return dev ? dev_to_rdev(dev) : NULL;
1432}
1433
1434static int regulator_match(struct device *dev, const void *data)
1435{
1436 struct regulator_dev *r = dev_to_rdev(dev);
1437
1438 return strcmp(rdev_get_name(r), data) == 0;
1439}
1440
1441static struct regulator_dev *regulator_lookup_by_name(const char *name)
1442{
1443 struct device *dev;
1444
1445 dev = class_find_device(®ulator_class, NULL, name, regulator_match);
1446
1447 return dev ? dev_to_rdev(dev) : NULL;
1448}
1449
1450/**
1451 * regulator_dev_lookup - lookup a regulator device.
1452 * @dev: device for regulator "consumer".
1453 * @supply: Supply name or regulator ID.
1454 * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if
1455 * lookup could succeed in the future.
1456 *
1457 * If successful, returns a struct regulator_dev that corresponds to the name
1458 * @supply and with the embedded struct device refcount incremented by one,
1459 * or NULL on failure. The refcount must be dropped by calling put_device().
1460 */
1461static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1462 const char *supply,
1463 int *ret)
1464{
1465 struct regulator_dev *r;
1466 struct device_node *node;
1467 struct regulator_map *map;
1468 const char *devname = NULL;
1469
1470 regulator_supply_alias(&dev, &supply);
1471
1472 /* first do a dt based lookup */
1473 if (dev && dev->of_node) {
1474 node = of_get_regulator(dev, supply);
1475 if (node) {
1476 r = of_find_regulator_by_node(node);
1477 if (r)
1478 return r;
1479 *ret = -EPROBE_DEFER;
1480 return NULL;
1481 } else {
1482 /*
1483 * If we couldn't even get the node then it's
1484 * not just that the device didn't register
1485 * yet, there's no node and we'll never
1486 * succeed.
1487 */
1488 *ret = -ENODEV;
1489 }
1490 }
1491
1492 /* if not found, try doing it non-dt way */
1493 if (dev)
1494 devname = dev_name(dev);
1495
1496 r = regulator_lookup_by_name(supply);
1497 if (r)
1498 return r;
1499
1500 mutex_lock(®ulator_list_mutex);
1501 list_for_each_entry(map, ®ulator_map_list, list) {
1502 /* If the mapping has a device set up it must match */
1503 if (map->dev_name &&
1504 (!devname || strcmp(map->dev_name, devname)))
1505 continue;
1506
1507 if (strcmp(map->supply, supply) == 0 &&
1508 get_device(&map->regulator->dev)) {
1509 mutex_unlock(®ulator_list_mutex);
1510 return map->regulator;
1511 }
1512 }
1513 mutex_unlock(®ulator_list_mutex);
1514
1515 return NULL;
1516}
1517
1518static int regulator_resolve_supply(struct regulator_dev *rdev)
1519{
1520 struct regulator_dev *r;
1521 struct device *dev = rdev->dev.parent;
1522 int ret;
1523
1524 /* No supply to resovle? */
1525 if (!rdev->supply_name)
1526 return 0;
1527
1528 /* Supply already resolved? */
1529 if (rdev->supply)
1530 return 0;
1531
1532 r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
1533 if (!r) {
1534 if (ret == -ENODEV) {
1535 /*
1536 * No supply was specified for this regulator and
1537 * there will never be one.
1538 */
1539 return 0;
1540 }
1541
1542 /* Did the lookup explicitly defer for us? */
1543 if (ret == -EPROBE_DEFER)
1544 return ret;
1545
1546 if (have_full_constraints()) {
1547 r = dummy_regulator_rdev;
1548 get_device(&r->dev);
1549 } else {
1550 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1551 rdev->supply_name, rdev->desc->name);
1552 return -EPROBE_DEFER;
1553 }
1554 }
1555
1556 /* Recursively resolve the supply of the supply */
1557 ret = regulator_resolve_supply(r);
1558 if (ret < 0) {
1559 put_device(&r->dev);
1560 return ret;
1561 }
1562
1563 ret = set_supply(rdev, r);
1564 if (ret < 0) {
1565 put_device(&r->dev);
1566 return ret;
1567 }
1568
1569 /* Cascade always-on state to supply */
1570 if (_regulator_is_enabled(rdev)) {
1571 ret = regulator_enable(rdev->supply);
1572 if (ret < 0) {
1573 _regulator_put(rdev->supply);
1574 rdev->supply = NULL;
1575 return ret;
1576 }
1577 }
1578
1579 return 0;
1580}
1581
1582/* Internal regulator request function */
1583static struct regulator *_regulator_get(struct device *dev, const char *id,
1584 bool exclusive, bool allow_dummy)
1585{
1586 struct regulator_dev *rdev;
1587 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1588 const char *devname = NULL;
1589 int ret;
1590
1591 if (id == NULL) {
1592 pr_err("get() with no identifier\n");
1593 return ERR_PTR(-EINVAL);
1594 }
1595
1596 if (dev)
1597 devname = dev_name(dev);
1598
1599 if (have_full_constraints())
1600 ret = -ENODEV;
1601 else
1602 ret = -EPROBE_DEFER;
1603
1604 rdev = regulator_dev_lookup(dev, id, &ret);
1605 if (rdev)
1606 goto found;
1607
1608 regulator = ERR_PTR(ret);
1609
1610 /*
1611 * If we have return value from dev_lookup fail, we do not expect to
1612 * succeed, so, quit with appropriate error value
1613 */
1614 if (ret && ret != -ENODEV)
1615 return regulator;
1616
1617 if (!devname)
1618 devname = "deviceless";
1619
1620 /*
1621 * Assume that a regulator is physically present and enabled
1622 * even if it isn't hooked up and just provide a dummy.
1623 */
1624 if (have_full_constraints() && allow_dummy) {
1625 pr_warn("%s supply %s not found, using dummy regulator\n",
1626 devname, id);
1627
1628 rdev = dummy_regulator_rdev;
1629 get_device(&rdev->dev);
1630 goto found;
1631 /* Don't log an error when called from regulator_get_optional() */
1632 } else if (!have_full_constraints() || exclusive) {
1633 dev_warn(dev, "dummy supplies not allowed\n");
1634 }
1635
1636 return regulator;
1637
1638found:
1639 if (rdev->exclusive) {
1640 regulator = ERR_PTR(-EPERM);
1641 put_device(&rdev->dev);
1642 return regulator;
1643 }
1644
1645 if (exclusive && rdev->open_count) {
1646 regulator = ERR_PTR(-EBUSY);
1647 put_device(&rdev->dev);
1648 return regulator;
1649 }
1650
1651 ret = regulator_resolve_supply(rdev);
1652 if (ret < 0) {
1653 regulator = ERR_PTR(ret);
1654 put_device(&rdev->dev);
1655 return regulator;
1656 }
1657
1658 if (!try_module_get(rdev->owner)) {
1659 put_device(&rdev->dev);
1660 return regulator;
1661 }
1662
1663 regulator = create_regulator(rdev, dev, id);
1664 if (regulator == NULL) {
1665 regulator = ERR_PTR(-ENOMEM);
1666 put_device(&rdev->dev);
1667 module_put(rdev->owner);
1668 return regulator;
1669 }
1670
1671 rdev->open_count++;
1672 if (exclusive) {
1673 rdev->exclusive = 1;
1674
1675 ret = _regulator_is_enabled(rdev);
1676 if (ret > 0)
1677 rdev->use_count = 1;
1678 else
1679 rdev->use_count = 0;
1680 }
1681
1682 return regulator;
1683}
1684
1685/**
1686 * regulator_get - lookup and obtain a reference to a regulator.
1687 * @dev: device for regulator "consumer"
1688 * @id: Supply name or regulator ID.
1689 *
1690 * Returns a struct regulator corresponding to the regulator producer,
1691 * or IS_ERR() condition containing errno.
1692 *
1693 * Use of supply names configured via regulator_set_device_supply() is
1694 * strongly encouraged. It is recommended that the supply name used
1695 * should match the name used for the supply and/or the relevant
1696 * device pins in the datasheet.
1697 */
1698struct regulator *regulator_get(struct device *dev, const char *id)
1699{
1700 return _regulator_get(dev, id, false, true);
1701}
1702EXPORT_SYMBOL_GPL(regulator_get);
1703
1704/**
1705 * regulator_get_exclusive - obtain exclusive access to a regulator.
1706 * @dev: device for regulator "consumer"
1707 * @id: Supply name or regulator ID.
1708 *
1709 * Returns a struct regulator corresponding to the regulator producer,
1710 * or IS_ERR() condition containing errno. Other consumers will be
1711 * unable to obtain this regulator while this reference is held and the
1712 * use count for the regulator will be initialised to reflect the current
1713 * state of the regulator.
1714 *
1715 * This is intended for use by consumers which cannot tolerate shared
1716 * use of the regulator such as those which need to force the
1717 * regulator off for correct operation of the hardware they are
1718 * controlling.
1719 *
1720 * Use of supply names configured via regulator_set_device_supply() is
1721 * strongly encouraged. It is recommended that the supply name used
1722 * should match the name used for the supply and/or the relevant
1723 * device pins in the datasheet.
1724 */
1725struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1726{
1727 return _regulator_get(dev, id, true, false);
1728}
1729EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1730
1731/**
1732 * regulator_get_optional - obtain optional access to a regulator.
1733 * @dev: device for regulator "consumer"
1734 * @id: Supply name or regulator ID.
1735 *
1736 * Returns a struct regulator corresponding to the regulator producer,
1737 * or IS_ERR() condition containing errno.
1738 *
1739 * This is intended for use by consumers for devices which can have
1740 * some supplies unconnected in normal use, such as some MMC devices.
1741 * It can allow the regulator core to provide stub supplies for other
1742 * supplies requested using normal regulator_get() calls without
1743 * disrupting the operation of drivers that can handle absent
1744 * supplies.
1745 *
1746 * Use of supply names configured via regulator_set_device_supply() is
1747 * strongly encouraged. It is recommended that the supply name used
1748 * should match the name used for the supply and/or the relevant
1749 * device pins in the datasheet.
1750 */
1751struct regulator *regulator_get_optional(struct device *dev, const char *id)
1752{
1753 return _regulator_get(dev, id, false, false);
1754}
1755EXPORT_SYMBOL_GPL(regulator_get_optional);
1756
1757/* regulator_list_mutex lock held by regulator_put() */
1758static void _regulator_put(struct regulator *regulator)
1759{
1760 struct regulator_dev *rdev;
1761
1762 if (IS_ERR_OR_NULL(regulator))
1763 return;
1764
1765 lockdep_assert_held_once(®ulator_list_mutex);
1766
1767 rdev = regulator->rdev;
1768
1769 debugfs_remove_recursive(regulator->debugfs);
1770
1771 /* remove any sysfs entries */
1772 if (regulator->dev)
1773 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1774 mutex_lock(&rdev->mutex);
1775 list_del(®ulator->list);
1776
1777 rdev->open_count--;
1778 rdev->exclusive = 0;
1779 put_device(&rdev->dev);
1780 mutex_unlock(&rdev->mutex);
1781
1782 kfree(regulator->supply_name);
1783 kfree(regulator);
1784
1785 module_put(rdev->owner);
1786}
1787
1788/**
1789 * regulator_put - "free" the regulator source
1790 * @regulator: regulator source
1791 *
1792 * Note: drivers must ensure that all regulator_enable calls made on this
1793 * regulator source are balanced by regulator_disable calls prior to calling
1794 * this function.
1795 */
1796void regulator_put(struct regulator *regulator)
1797{
1798 mutex_lock(®ulator_list_mutex);
1799 _regulator_put(regulator);
1800 mutex_unlock(®ulator_list_mutex);
1801}
1802EXPORT_SYMBOL_GPL(regulator_put);
1803
1804/**
1805 * regulator_register_supply_alias - Provide device alias for supply lookup
1806 *
1807 * @dev: device that will be given as the regulator "consumer"
1808 * @id: Supply name or regulator ID
1809 * @alias_dev: device that should be used to lookup the supply
1810 * @alias_id: Supply name or regulator ID that should be used to lookup the
1811 * supply
1812 *
1813 * All lookups for id on dev will instead be conducted for alias_id on
1814 * alias_dev.
1815 */
1816int regulator_register_supply_alias(struct device *dev, const char *id,
1817 struct device *alias_dev,
1818 const char *alias_id)
1819{
1820 struct regulator_supply_alias *map;
1821
1822 map = regulator_find_supply_alias(dev, id);
1823 if (map)
1824 return -EEXIST;
1825
1826 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1827 if (!map)
1828 return -ENOMEM;
1829
1830 map->src_dev = dev;
1831 map->src_supply = id;
1832 map->alias_dev = alias_dev;
1833 map->alias_supply = alias_id;
1834
1835 list_add(&map->list, ®ulator_supply_alias_list);
1836
1837 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1838 id, dev_name(dev), alias_id, dev_name(alias_dev));
1839
1840 return 0;
1841}
1842EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1843
1844/**
1845 * regulator_unregister_supply_alias - Remove device alias
1846 *
1847 * @dev: device that will be given as the regulator "consumer"
1848 * @id: Supply name or regulator ID
1849 *
1850 * Remove a lookup alias if one exists for id on dev.
1851 */
1852void regulator_unregister_supply_alias(struct device *dev, const char *id)
1853{
1854 struct regulator_supply_alias *map;
1855
1856 map = regulator_find_supply_alias(dev, id);
1857 if (map) {
1858 list_del(&map->list);
1859 kfree(map);
1860 }
1861}
1862EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1863
1864/**
1865 * regulator_bulk_register_supply_alias - register multiple aliases
1866 *
1867 * @dev: device that will be given as the regulator "consumer"
1868 * @id: List of supply names or regulator IDs
1869 * @alias_dev: device that should be used to lookup the supply
1870 * @alias_id: List of supply names or regulator IDs that should be used to
1871 * lookup the supply
1872 * @num_id: Number of aliases to register
1873 *
1874 * @return 0 on success, an errno on failure.
1875 *
1876 * This helper function allows drivers to register several supply
1877 * aliases in one operation. If any of the aliases cannot be
1878 * registered any aliases that were registered will be removed
1879 * before returning to the caller.
1880 */
1881int regulator_bulk_register_supply_alias(struct device *dev,
1882 const char *const *id,
1883 struct device *alias_dev,
1884 const char *const *alias_id,
1885 int num_id)
1886{
1887 int i;
1888 int ret;
1889
1890 for (i = 0; i < num_id; ++i) {
1891 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1892 alias_id[i]);
1893 if (ret < 0)
1894 goto err;
1895 }
1896
1897 return 0;
1898
1899err:
1900 dev_err(dev,
1901 "Failed to create supply alias %s,%s -> %s,%s\n",
1902 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1903
1904 while (--i >= 0)
1905 regulator_unregister_supply_alias(dev, id[i]);
1906
1907 return ret;
1908}
1909EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1910
1911/**
1912 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1913 *
1914 * @dev: device that will be given as the regulator "consumer"
1915 * @id: List of supply names or regulator IDs
1916 * @num_id: Number of aliases to unregister
1917 *
1918 * This helper function allows drivers to unregister several supply
1919 * aliases in one operation.
1920 */
1921void regulator_bulk_unregister_supply_alias(struct device *dev,
1922 const char *const *id,
1923 int num_id)
1924{
1925 int i;
1926
1927 for (i = 0; i < num_id; ++i)
1928 regulator_unregister_supply_alias(dev, id[i]);
1929}
1930EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1931
1932
1933/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1934static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1935 const struct regulator_config *config)
1936{
1937 struct regulator_enable_gpio *pin;
1938 struct gpio_desc *gpiod;
1939 int ret;
1940
1941 gpiod = gpio_to_desc(config->ena_gpio);
1942
1943 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1944 if (pin->gpiod == gpiod) {
1945 rdev_dbg(rdev, "GPIO %d is already used\n",
1946 config->ena_gpio);
1947 goto update_ena_gpio_to_rdev;
1948 }
1949 }
1950
1951 ret = gpio_request_one(config->ena_gpio,
1952 GPIOF_DIR_OUT | config->ena_gpio_flags,
1953 rdev_get_name(rdev));
1954 if (ret)
1955 return ret;
1956
1957 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1958 if (pin == NULL) {
1959 gpio_free(config->ena_gpio);
1960 return -ENOMEM;
1961 }
1962
1963 pin->gpiod = gpiod;
1964 pin->ena_gpio_invert = config->ena_gpio_invert;
1965 list_add(&pin->list, ®ulator_ena_gpio_list);
1966
1967update_ena_gpio_to_rdev:
1968 pin->request_count++;
1969 rdev->ena_pin = pin;
1970 return 0;
1971}
1972
1973static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1974{
1975 struct regulator_enable_gpio *pin, *n;
1976
1977 if (!rdev->ena_pin)
1978 return;
1979
1980 /* Free the GPIO only in case of no use */
1981 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
1982 if (pin->gpiod == rdev->ena_pin->gpiod) {
1983 if (pin->request_count <= 1) {
1984 pin->request_count = 0;
1985 gpiod_put(pin->gpiod);
1986 list_del(&pin->list);
1987 kfree(pin);
1988 rdev->ena_pin = NULL;
1989 return;
1990 } else {
1991 pin->request_count--;
1992 }
1993 }
1994 }
1995}
1996
1997/**
1998 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1999 * @rdev: regulator_dev structure
2000 * @enable: enable GPIO at initial use?
2001 *
2002 * GPIO is enabled in case of initial use. (enable_count is 0)
2003 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2004 */
2005static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
2006{
2007 struct regulator_enable_gpio *pin = rdev->ena_pin;
2008
2009 if (!pin)
2010 return -EINVAL;
2011
2012 if (enable) {
2013 /* Enable GPIO at initial use */
2014 if (pin->enable_count == 0)
2015 gpiod_set_value_cansleep(pin->gpiod,
2016 !pin->ena_gpio_invert);
2017
2018 pin->enable_count++;
2019 } else {
2020 if (pin->enable_count > 1) {
2021 pin->enable_count--;
2022 return 0;
2023 }
2024
2025 /* Disable GPIO if not used */
2026 if (pin->enable_count <= 1) {
2027 gpiod_set_value_cansleep(pin->gpiod,
2028 pin->ena_gpio_invert);
2029 pin->enable_count = 0;
2030 }
2031 }
2032
2033 return 0;
2034}
2035
2036/**
2037 * _regulator_enable_delay - a delay helper function
2038 * @delay: time to delay in microseconds
2039 *
2040 * Delay for the requested amount of time as per the guidelines in:
2041 *
2042 * Documentation/timers/timers-howto.txt
2043 *
2044 * The assumption here is that regulators will never be enabled in
2045 * atomic context and therefore sleeping functions can be used.
2046 */
2047static void _regulator_enable_delay(unsigned int delay)
2048{
2049 unsigned int ms = delay / 1000;
2050 unsigned int us = delay % 1000;
2051
2052 if (ms > 0) {
2053 /*
2054 * For small enough values, handle super-millisecond
2055 * delays in the usleep_range() call below.
2056 */
2057 if (ms < 20)
2058 us += ms * 1000;
2059 else
2060 msleep(ms);
2061 }
2062
2063 /*
2064 * Give the scheduler some room to coalesce with any other
2065 * wakeup sources. For delays shorter than 10 us, don't even
2066 * bother setting up high-resolution timers and just busy-
2067 * loop.
2068 */
2069 if (us >= 10)
2070 usleep_range(us, us + 100);
2071 else
2072 udelay(us);
2073}
2074
2075static int _regulator_do_enable(struct regulator_dev *rdev)
2076{
2077 int ret, delay;
2078
2079 /* Query before enabling in case configuration dependent. */
2080 ret = _regulator_get_enable_time(rdev);
2081 if (ret >= 0) {
2082 delay = ret;
2083 } else {
2084 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2085 delay = 0;
2086 }
2087
2088 trace_regulator_enable(rdev_get_name(rdev));
2089
2090 if (rdev->desc->off_on_delay) {
2091 /* if needed, keep a distance of off_on_delay from last time
2092 * this regulator was disabled.
2093 */
2094 unsigned long start_jiffy = jiffies;
2095 unsigned long intended, max_delay, remaining;
2096
2097 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2098 intended = rdev->last_off_jiffy + max_delay;
2099
2100 if (time_before(start_jiffy, intended)) {
2101 /* calc remaining jiffies to deal with one-time
2102 * timer wrapping.
2103 * in case of multiple timer wrapping, either it can be
2104 * detected by out-of-range remaining, or it cannot be
2105 * detected and we gets a panelty of
2106 * _regulator_enable_delay().
2107 */
2108 remaining = intended - start_jiffy;
2109 if (remaining <= max_delay)
2110 _regulator_enable_delay(
2111 jiffies_to_usecs(remaining));
2112 }
2113 }
2114
2115 if (rdev->ena_pin) {
2116 if (!rdev->ena_gpio_state) {
2117 ret = regulator_ena_gpio_ctrl(rdev, true);
2118 if (ret < 0)
2119 return ret;
2120 rdev->ena_gpio_state = 1;
2121 }
2122 } else if (rdev->desc->ops->enable) {
2123 ret = rdev->desc->ops->enable(rdev);
2124 if (ret < 0)
2125 return ret;
2126 } else {
2127 return -EINVAL;
2128 }
2129
2130 /* Allow the regulator to ramp; it would be useful to extend
2131 * this for bulk operations so that the regulators can ramp
2132 * together. */
2133 trace_regulator_enable_delay(rdev_get_name(rdev));
2134
2135 _regulator_enable_delay(delay);
2136
2137 trace_regulator_enable_complete(rdev_get_name(rdev));
2138
2139 return 0;
2140}
2141
2142/* locks held by regulator_enable() */
2143static int _regulator_enable(struct regulator_dev *rdev)
2144{
2145 int ret;
2146
2147 lockdep_assert_held_once(&rdev->mutex);
2148
2149 /* check voltage and requested load before enabling */
2150 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2151 drms_uA_update(rdev);
2152
2153 if (rdev->use_count == 0) {
2154 /* The regulator may on if it's not switchable or left on */
2155 ret = _regulator_is_enabled(rdev);
2156 if (ret == -EINVAL || ret == 0) {
2157 if (!regulator_ops_is_valid(rdev,
2158 REGULATOR_CHANGE_STATUS))
2159 return -EPERM;
2160
2161 ret = _regulator_do_enable(rdev);
2162 if (ret < 0)
2163 return ret;
2164
2165 } else if (ret < 0) {
2166 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
2167 return ret;
2168 }
2169 /* Fallthrough on positive return values - already enabled */
2170 }
2171
2172 rdev->use_count++;
2173
2174 return 0;
2175}
2176
2177/**
2178 * regulator_enable - enable regulator output
2179 * @regulator: regulator source
2180 *
2181 * Request that the regulator be enabled with the regulator output at
2182 * the predefined voltage or current value. Calls to regulator_enable()
2183 * must be balanced with calls to regulator_disable().
2184 *
2185 * NOTE: the output value can be set by other drivers, boot loader or may be
2186 * hardwired in the regulator.
2187 */
2188int regulator_enable(struct regulator *regulator)
2189{
2190 struct regulator_dev *rdev = regulator->rdev;
2191 int ret = 0;
2192
2193 if (regulator->always_on)
2194 return 0;
2195
2196 if (rdev->supply) {
2197 ret = regulator_enable(rdev->supply);
2198 if (ret != 0)
2199 return ret;
2200 }
2201
2202 mutex_lock(&rdev->mutex);
2203 ret = _regulator_enable(rdev);
2204 mutex_unlock(&rdev->mutex);
2205
2206 if (ret != 0 && rdev->supply)
2207 regulator_disable(rdev->supply);
2208
2209 return ret;
2210}
2211EXPORT_SYMBOL_GPL(regulator_enable);
2212
2213static int _regulator_do_disable(struct regulator_dev *rdev)
2214{
2215 int ret;
2216
2217 trace_regulator_disable(rdev_get_name(rdev));
2218
2219 if (rdev->ena_pin) {
2220 if (rdev->ena_gpio_state) {
2221 ret = regulator_ena_gpio_ctrl(rdev, false);
2222 if (ret < 0)
2223 return ret;
2224 rdev->ena_gpio_state = 0;
2225 }
2226
2227 } else if (rdev->desc->ops->disable) {
2228 ret = rdev->desc->ops->disable(rdev);
2229 if (ret != 0)
2230 return ret;
2231 }
2232
2233 /* cares about last_off_jiffy only if off_on_delay is required by
2234 * device.
2235 */
2236 if (rdev->desc->off_on_delay)
2237 rdev->last_off_jiffy = jiffies;
2238
2239 trace_regulator_disable_complete(rdev_get_name(rdev));
2240
2241 return 0;
2242}
2243
2244/* locks held by regulator_disable() */
2245static int _regulator_disable(struct regulator_dev *rdev)
2246{
2247 int ret = 0;
2248
2249 lockdep_assert_held_once(&rdev->mutex);
2250
2251 if (WARN(rdev->use_count <= 0,
2252 "unbalanced disables for %s\n", rdev_get_name(rdev)))
2253 return -EIO;
2254
2255 /* are we the last user and permitted to disable ? */
2256 if (rdev->use_count == 1 &&
2257 (rdev->constraints && !rdev->constraints->always_on)) {
2258
2259 /* we are last user */
2260 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
2261 ret = _notifier_call_chain(rdev,
2262 REGULATOR_EVENT_PRE_DISABLE,
2263 NULL);
2264 if (ret & NOTIFY_STOP_MASK)
2265 return -EINVAL;
2266
2267 ret = _regulator_do_disable(rdev);
2268 if (ret < 0) {
2269 rdev_err(rdev, "failed to disable\n");
2270 _notifier_call_chain(rdev,
2271 REGULATOR_EVENT_ABORT_DISABLE,
2272 NULL);
2273 return ret;
2274 }
2275 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2276 NULL);
2277 }
2278
2279 rdev->use_count = 0;
2280 } else if (rdev->use_count > 1) {
2281 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2282 drms_uA_update(rdev);
2283
2284 rdev->use_count--;
2285 }
2286
2287 return ret;
2288}
2289
2290/**
2291 * regulator_disable - disable regulator output
2292 * @regulator: regulator source
2293 *
2294 * Disable the regulator output voltage or current. Calls to
2295 * regulator_enable() must be balanced with calls to
2296 * regulator_disable().
2297 *
2298 * NOTE: this will only disable the regulator output if no other consumer
2299 * devices have it enabled, the regulator device supports disabling and
2300 * machine constraints permit this operation.
2301 */
2302int regulator_disable(struct regulator *regulator)
2303{
2304 struct regulator_dev *rdev = regulator->rdev;
2305 int ret = 0;
2306
2307 if (regulator->always_on)
2308 return 0;
2309
2310 mutex_lock(&rdev->mutex);
2311 ret = _regulator_disable(rdev);
2312 mutex_unlock(&rdev->mutex);
2313
2314 if (ret == 0 && rdev->supply)
2315 regulator_disable(rdev->supply);
2316
2317 return ret;
2318}
2319EXPORT_SYMBOL_GPL(regulator_disable);
2320
2321/* locks held by regulator_force_disable() */
2322static int _regulator_force_disable(struct regulator_dev *rdev)
2323{
2324 int ret = 0;
2325
2326 lockdep_assert_held_once(&rdev->mutex);
2327
2328 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2329 REGULATOR_EVENT_PRE_DISABLE, NULL);
2330 if (ret & NOTIFY_STOP_MASK)
2331 return -EINVAL;
2332
2333 ret = _regulator_do_disable(rdev);
2334 if (ret < 0) {
2335 rdev_err(rdev, "failed to force disable\n");
2336 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2337 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2338 return ret;
2339 }
2340
2341 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2342 REGULATOR_EVENT_DISABLE, NULL);
2343
2344 return 0;
2345}
2346
2347/**
2348 * regulator_force_disable - force disable regulator output
2349 * @regulator: regulator source
2350 *
2351 * Forcibly disable the regulator output voltage or current.
2352 * NOTE: this *will* disable the regulator output even if other consumer
2353 * devices have it enabled. This should be used for situations when device
2354 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2355 */
2356int regulator_force_disable(struct regulator *regulator)
2357{
2358 struct regulator_dev *rdev = regulator->rdev;
2359 int ret;
2360
2361 mutex_lock(&rdev->mutex);
2362 regulator->uA_load = 0;
2363 ret = _regulator_force_disable(regulator->rdev);
2364 mutex_unlock(&rdev->mutex);
2365
2366 if (rdev->supply)
2367 while (rdev->open_count--)
2368 regulator_disable(rdev->supply);
2369
2370 return ret;
2371}
2372EXPORT_SYMBOL_GPL(regulator_force_disable);
2373
2374static void regulator_disable_work(struct work_struct *work)
2375{
2376 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2377 disable_work.work);
2378 int count, i, ret;
2379
2380 mutex_lock(&rdev->mutex);
2381
2382 BUG_ON(!rdev->deferred_disables);
2383
2384 count = rdev->deferred_disables;
2385 rdev->deferred_disables = 0;
2386
2387 for (i = 0; i < count; i++) {
2388 ret = _regulator_disable(rdev);
2389 if (ret != 0)
2390 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2391 }
2392
2393 mutex_unlock(&rdev->mutex);
2394
2395 if (rdev->supply) {
2396 for (i = 0; i < count; i++) {
2397 ret = regulator_disable(rdev->supply);
2398 if (ret != 0) {
2399 rdev_err(rdev,
2400 "Supply disable failed: %d\n", ret);
2401 }
2402 }
2403 }
2404}
2405
2406/**
2407 * regulator_disable_deferred - disable regulator output with delay
2408 * @regulator: regulator source
2409 * @ms: miliseconds until the regulator is disabled
2410 *
2411 * Execute regulator_disable() on the regulator after a delay. This
2412 * is intended for use with devices that require some time to quiesce.
2413 *
2414 * NOTE: this will only disable the regulator output if no other consumer
2415 * devices have it enabled, the regulator device supports disabling and
2416 * machine constraints permit this operation.
2417 */
2418int regulator_disable_deferred(struct regulator *regulator, int ms)
2419{
2420 struct regulator_dev *rdev = regulator->rdev;
2421
2422 if (regulator->always_on)
2423 return 0;
2424
2425 if (!ms)
2426 return regulator_disable(regulator);
2427
2428 mutex_lock(&rdev->mutex);
2429 rdev->deferred_disables++;
2430 mutex_unlock(&rdev->mutex);
2431
2432 queue_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2433 msecs_to_jiffies(ms));
2434 return 0;
2435}
2436EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2437
2438static int _regulator_is_enabled(struct regulator_dev *rdev)
2439{
2440 /* A GPIO control always takes precedence */
2441 if (rdev->ena_pin)
2442 return rdev->ena_gpio_state;
2443
2444 /* If we don't know then assume that the regulator is always on */
2445 if (!rdev->desc->ops->is_enabled)
2446 return 1;
2447
2448 return rdev->desc->ops->is_enabled(rdev);
2449}
2450
2451static int _regulator_list_voltage(struct regulator *regulator,
2452 unsigned selector, int lock)
2453{
2454 struct regulator_dev *rdev = regulator->rdev;
2455 const struct regulator_ops *ops = rdev->desc->ops;
2456 int ret;
2457
2458 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2459 return rdev->desc->fixed_uV;
2460
2461 if (ops->list_voltage) {
2462 if (selector >= rdev->desc->n_voltages)
2463 return -EINVAL;
2464 if (lock)
2465 mutex_lock(&rdev->mutex);
2466 ret = ops->list_voltage(rdev, selector);
2467 if (lock)
2468 mutex_unlock(&rdev->mutex);
2469 } else if (rdev->supply) {
2470 ret = _regulator_list_voltage(rdev->supply, selector, lock);
2471 } else {
2472 return -EINVAL;
2473 }
2474
2475 if (ret > 0) {
2476 if (ret < rdev->constraints->min_uV)
2477 ret = 0;
2478 else if (ret > rdev->constraints->max_uV)
2479 ret = 0;
2480 }
2481
2482 return ret;
2483}
2484
2485/**
2486 * regulator_is_enabled - is the regulator output enabled
2487 * @regulator: regulator source
2488 *
2489 * Returns positive if the regulator driver backing the source/client
2490 * has requested that the device be enabled, zero if it hasn't, else a
2491 * negative errno code.
2492 *
2493 * Note that the device backing this regulator handle can have multiple
2494 * users, so it might be enabled even if regulator_enable() was never
2495 * called for this particular source.
2496 */
2497int regulator_is_enabled(struct regulator *regulator)
2498{
2499 int ret;
2500
2501 if (regulator->always_on)
2502 return 1;
2503
2504 mutex_lock(®ulator->rdev->mutex);
2505 ret = _regulator_is_enabled(regulator->rdev);
2506 mutex_unlock(®ulator->rdev->mutex);
2507
2508 return ret;
2509}
2510EXPORT_SYMBOL_GPL(regulator_is_enabled);
2511
2512/**
2513 * regulator_count_voltages - count regulator_list_voltage() selectors
2514 * @regulator: regulator source
2515 *
2516 * Returns number of selectors, or negative errno. Selectors are
2517 * numbered starting at zero, and typically correspond to bitfields
2518 * in hardware registers.
2519 */
2520int regulator_count_voltages(struct regulator *regulator)
2521{
2522 struct regulator_dev *rdev = regulator->rdev;
2523
2524 if (rdev->desc->n_voltages)
2525 return rdev->desc->n_voltages;
2526
2527 if (!rdev->supply)
2528 return -EINVAL;
2529
2530 return regulator_count_voltages(rdev->supply);
2531}
2532EXPORT_SYMBOL_GPL(regulator_count_voltages);
2533
2534/**
2535 * regulator_list_voltage - enumerate supported voltages
2536 * @regulator: regulator source
2537 * @selector: identify voltage to list
2538 * Context: can sleep
2539 *
2540 * Returns a voltage that can be passed to @regulator_set_voltage(),
2541 * zero if this selector code can't be used on this system, or a
2542 * negative errno.
2543 */
2544int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2545{
2546 return _regulator_list_voltage(regulator, selector, 1);
2547}
2548EXPORT_SYMBOL_GPL(regulator_list_voltage);
2549
2550/**
2551 * regulator_get_regmap - get the regulator's register map
2552 * @regulator: regulator source
2553 *
2554 * Returns the register map for the given regulator, or an ERR_PTR value
2555 * if the regulator doesn't use regmap.
2556 */
2557struct regmap *regulator_get_regmap(struct regulator *regulator)
2558{
2559 struct regmap *map = regulator->rdev->regmap;
2560
2561 return map ? map : ERR_PTR(-EOPNOTSUPP);
2562}
2563
2564/**
2565 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2566 * @regulator: regulator source
2567 * @vsel_reg: voltage selector register, output parameter
2568 * @vsel_mask: mask for voltage selector bitfield, output parameter
2569 *
2570 * Returns the hardware register offset and bitmask used for setting the
2571 * regulator voltage. This might be useful when configuring voltage-scaling
2572 * hardware or firmware that can make I2C requests behind the kernel's back,
2573 * for example.
2574 *
2575 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2576 * and 0 is returned, otherwise a negative errno is returned.
2577 */
2578int regulator_get_hardware_vsel_register(struct regulator *regulator,
2579 unsigned *vsel_reg,
2580 unsigned *vsel_mask)
2581{
2582 struct regulator_dev *rdev = regulator->rdev;
2583 const struct regulator_ops *ops = rdev->desc->ops;
2584
2585 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2586 return -EOPNOTSUPP;
2587
2588 *vsel_reg = rdev->desc->vsel_reg;
2589 *vsel_mask = rdev->desc->vsel_mask;
2590
2591 return 0;
2592}
2593EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2594
2595/**
2596 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2597 * @regulator: regulator source
2598 * @selector: identify voltage to list
2599 *
2600 * Converts the selector to a hardware-specific voltage selector that can be
2601 * directly written to the regulator registers. The address of the voltage
2602 * register can be determined by calling @regulator_get_hardware_vsel_register.
2603 *
2604 * On error a negative errno is returned.
2605 */
2606int regulator_list_hardware_vsel(struct regulator *regulator,
2607 unsigned selector)
2608{
2609 struct regulator_dev *rdev = regulator->rdev;
2610 const struct regulator_ops *ops = rdev->desc->ops;
2611
2612 if (selector >= rdev->desc->n_voltages)
2613 return -EINVAL;
2614 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2615 return -EOPNOTSUPP;
2616
2617 return selector;
2618}
2619EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2620
2621/**
2622 * regulator_get_linear_step - return the voltage step size between VSEL values
2623 * @regulator: regulator source
2624 *
2625 * Returns the voltage step size between VSEL values for linear
2626 * regulators, or return 0 if the regulator isn't a linear regulator.
2627 */
2628unsigned int regulator_get_linear_step(struct regulator *regulator)
2629{
2630 struct regulator_dev *rdev = regulator->rdev;
2631
2632 return rdev->desc->uV_step;
2633}
2634EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2635
2636/**
2637 * regulator_is_supported_voltage - check if a voltage range can be supported
2638 *
2639 * @regulator: Regulator to check.
2640 * @min_uV: Minimum required voltage in uV.
2641 * @max_uV: Maximum required voltage in uV.
2642 *
2643 * Returns a boolean or a negative error code.
2644 */
2645int regulator_is_supported_voltage(struct regulator *regulator,
2646 int min_uV, int max_uV)
2647{
2648 struct regulator_dev *rdev = regulator->rdev;
2649 int i, voltages, ret;
2650
2651 /* If we can't change voltage check the current voltage */
2652 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2653 ret = regulator_get_voltage(regulator);
2654 if (ret >= 0)
2655 return min_uV <= ret && ret <= max_uV;
2656 else
2657 return ret;
2658 }
2659
2660 /* Any voltage within constrains range is fine? */
2661 if (rdev->desc->continuous_voltage_range)
2662 return min_uV >= rdev->constraints->min_uV &&
2663 max_uV <= rdev->constraints->max_uV;
2664
2665 ret = regulator_count_voltages(regulator);
2666 if (ret < 0)
2667 return ret;
2668 voltages = ret;
2669
2670 for (i = 0; i < voltages; i++) {
2671 ret = regulator_list_voltage(regulator, i);
2672
2673 if (ret >= min_uV && ret <= max_uV)
2674 return 1;
2675 }
2676
2677 return 0;
2678}
2679EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2680
2681static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2682 int max_uV)
2683{
2684 const struct regulator_desc *desc = rdev->desc;
2685
2686 if (desc->ops->map_voltage)
2687 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2688
2689 if (desc->ops->list_voltage == regulator_list_voltage_linear)
2690 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2691
2692 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2693 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2694
2695 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2696}
2697
2698static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2699 int min_uV, int max_uV,
2700 unsigned *selector)
2701{
2702 struct pre_voltage_change_data data;
2703 int ret;
2704
2705 data.old_uV = _regulator_get_voltage(rdev);
2706 data.min_uV = min_uV;
2707 data.max_uV = max_uV;
2708 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2709 &data);
2710 if (ret & NOTIFY_STOP_MASK)
2711 return -EINVAL;
2712
2713 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2714 if (ret >= 0)
2715 return ret;
2716
2717 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2718 (void *)data.old_uV);
2719
2720 return ret;
2721}
2722
2723static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2724 int uV, unsigned selector)
2725{
2726 struct pre_voltage_change_data data;
2727 int ret;
2728
2729 data.old_uV = _regulator_get_voltage(rdev);
2730 data.min_uV = uV;
2731 data.max_uV = uV;
2732 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2733 &data);
2734 if (ret & NOTIFY_STOP_MASK)
2735 return -EINVAL;
2736
2737 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2738 if (ret >= 0)
2739 return ret;
2740
2741 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2742 (void *)data.old_uV);
2743
2744 return ret;
2745}
2746
2747static int _regulator_set_voltage_time(struct regulator_dev *rdev,
2748 int old_uV, int new_uV)
2749{
2750 unsigned int ramp_delay = 0;
2751
2752 if (rdev->constraints->ramp_delay)
2753 ramp_delay = rdev->constraints->ramp_delay;
2754 else if (rdev->desc->ramp_delay)
2755 ramp_delay = rdev->desc->ramp_delay;
2756
2757 if (ramp_delay == 0) {
2758 rdev_dbg(rdev, "ramp_delay not set\n");
2759 return 0;
2760 }
2761
2762 return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
2763}
2764
2765static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2766 int min_uV, int max_uV)
2767{
2768 int ret;
2769 int delay = 0;
2770 int best_val = 0;
2771 unsigned int selector;
2772 int old_selector = -1;
2773 const struct regulator_ops *ops = rdev->desc->ops;
2774 int old_uV = _regulator_get_voltage(rdev);
2775
2776 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2777
2778 min_uV += rdev->constraints->uV_offset;
2779 max_uV += rdev->constraints->uV_offset;
2780
2781 /*
2782 * If we can't obtain the old selector there is not enough
2783 * info to call set_voltage_time_sel().
2784 */
2785 if (_regulator_is_enabled(rdev) &&
2786 ops->set_voltage_time_sel && ops->get_voltage_sel) {
2787 old_selector = ops->get_voltage_sel(rdev);
2788 if (old_selector < 0)
2789 return old_selector;
2790 }
2791
2792 if (ops->set_voltage) {
2793 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2794 &selector);
2795
2796 if (ret >= 0) {
2797 if (ops->list_voltage)
2798 best_val = ops->list_voltage(rdev,
2799 selector);
2800 else
2801 best_val = _regulator_get_voltage(rdev);
2802 }
2803
2804 } else if (ops->set_voltage_sel) {
2805 ret = regulator_map_voltage(rdev, min_uV, max_uV);
2806 if (ret >= 0) {
2807 best_val = ops->list_voltage(rdev, ret);
2808 if (min_uV <= best_val && max_uV >= best_val) {
2809 selector = ret;
2810 if (old_selector == selector)
2811 ret = 0;
2812 else
2813 ret = _regulator_call_set_voltage_sel(
2814 rdev, best_val, selector);
2815 } else {
2816 ret = -EINVAL;
2817 }
2818 }
2819 } else {
2820 ret = -EINVAL;
2821 }
2822
2823 if (ret)
2824 goto out;
2825
2826 if (ops->set_voltage_time_sel) {
2827 /*
2828 * Call set_voltage_time_sel if successfully obtained
2829 * old_selector
2830 */
2831 if (old_selector >= 0 && old_selector != selector)
2832 delay = ops->set_voltage_time_sel(rdev, old_selector,
2833 selector);
2834 } else {
2835 if (old_uV != best_val) {
2836 if (ops->set_voltage_time)
2837 delay = ops->set_voltage_time(rdev, old_uV,
2838 best_val);
2839 else
2840 delay = _regulator_set_voltage_time(rdev,
2841 old_uV,
2842 best_val);
2843 }
2844 }
2845
2846 if (delay < 0) {
2847 rdev_warn(rdev, "failed to get delay: %d\n", delay);
2848 delay = 0;
2849 }
2850
2851 /* Insert any necessary delays */
2852 if (delay >= 1000) {
2853 mdelay(delay / 1000);
2854 udelay(delay % 1000);
2855 } else if (delay) {
2856 udelay(delay);
2857 }
2858
2859 if (best_val >= 0) {
2860 unsigned long data = best_val;
2861
2862 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2863 (void *)data);
2864 }
2865
2866out:
2867 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2868
2869 return ret;
2870}
2871
2872static int regulator_set_voltage_unlocked(struct regulator *regulator,
2873 int min_uV, int max_uV)
2874{
2875 struct regulator_dev *rdev = regulator->rdev;
2876 int ret = 0;
2877 int old_min_uV, old_max_uV;
2878 int current_uV;
2879 int best_supply_uV = 0;
2880 int supply_change_uV = 0;
2881
2882 /* If we're setting the same range as last time the change
2883 * should be a noop (some cpufreq implementations use the same
2884 * voltage for multiple frequencies, for example).
2885 */
2886 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2887 goto out;
2888
2889 /* If we're trying to set a range that overlaps the current voltage,
2890 * return successfully even though the regulator does not support
2891 * changing the voltage.
2892 */
2893 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2894 current_uV = _regulator_get_voltage(rdev);
2895 if (min_uV <= current_uV && current_uV <= max_uV) {
2896 regulator->min_uV = min_uV;
2897 regulator->max_uV = max_uV;
2898 goto out;
2899 }
2900 }
2901
2902 /* sanity check */
2903 if (!rdev->desc->ops->set_voltage &&
2904 !rdev->desc->ops->set_voltage_sel) {
2905 ret = -EINVAL;
2906 goto out;
2907 }
2908
2909 /* constraints check */
2910 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2911 if (ret < 0)
2912 goto out;
2913
2914 /* restore original values in case of error */
2915 old_min_uV = regulator->min_uV;
2916 old_max_uV = regulator->max_uV;
2917 regulator->min_uV = min_uV;
2918 regulator->max_uV = max_uV;
2919
2920 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2921 if (ret < 0)
2922 goto out2;
2923
2924 if (rdev->supply && (rdev->desc->min_dropout_uV ||
2925 !rdev->desc->ops->get_voltage)) {
2926 int current_supply_uV;
2927 int selector;
2928
2929 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2930 if (selector < 0) {
2931 ret = selector;
2932 goto out2;
2933 }
2934
2935 best_supply_uV = _regulator_list_voltage(regulator, selector, 0);
2936 if (best_supply_uV < 0) {
2937 ret = best_supply_uV;
2938 goto out2;
2939 }
2940
2941 best_supply_uV += rdev->desc->min_dropout_uV;
2942
2943 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2944 if (current_supply_uV < 0) {
2945 ret = current_supply_uV;
2946 goto out2;
2947 }
2948
2949 supply_change_uV = best_supply_uV - current_supply_uV;
2950 }
2951
2952 if (supply_change_uV > 0) {
2953 ret = regulator_set_voltage_unlocked(rdev->supply,
2954 best_supply_uV, INT_MAX);
2955 if (ret) {
2956 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
2957 ret);
2958 goto out2;
2959 }
2960 }
2961
2962 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2963 if (ret < 0)
2964 goto out2;
2965
2966 if (supply_change_uV < 0) {
2967 ret = regulator_set_voltage_unlocked(rdev->supply,
2968 best_supply_uV, INT_MAX);
2969 if (ret)
2970 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
2971 ret);
2972 /* No need to fail here */
2973 ret = 0;
2974 }
2975
2976out:
2977 return ret;
2978out2:
2979 regulator->min_uV = old_min_uV;
2980 regulator->max_uV = old_max_uV;
2981
2982 return ret;
2983}
2984
2985/**
2986 * regulator_set_voltage - set regulator output voltage
2987 * @regulator: regulator source
2988 * @min_uV: Minimum required voltage in uV
2989 * @max_uV: Maximum acceptable voltage in uV
2990 *
2991 * Sets a voltage regulator to the desired output voltage. This can be set
2992 * during any regulator state. IOW, regulator can be disabled or enabled.
2993 *
2994 * If the regulator is enabled then the voltage will change to the new value
2995 * immediately otherwise if the regulator is disabled the regulator will
2996 * output at the new voltage when enabled.
2997 *
2998 * NOTE: If the regulator is shared between several devices then the lowest
2999 * request voltage that meets the system constraints will be used.
3000 * Regulator system constraints must be set for this regulator before
3001 * calling this function otherwise this call will fail.
3002 */
3003int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
3004{
3005 int ret = 0;
3006
3007 regulator_lock_supply(regulator->rdev);
3008
3009 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
3010
3011 regulator_unlock_supply(regulator->rdev);
3012
3013 return ret;
3014}
3015EXPORT_SYMBOL_GPL(regulator_set_voltage);
3016
3017/**
3018 * regulator_set_voltage_time - get raise/fall time
3019 * @regulator: regulator source
3020 * @old_uV: starting voltage in microvolts
3021 * @new_uV: target voltage in microvolts
3022 *
3023 * Provided with the starting and ending voltage, this function attempts to
3024 * calculate the time in microseconds required to rise or fall to this new
3025 * voltage.
3026 */
3027int regulator_set_voltage_time(struct regulator *regulator,
3028 int old_uV, int new_uV)
3029{
3030 struct regulator_dev *rdev = regulator->rdev;
3031 const struct regulator_ops *ops = rdev->desc->ops;
3032 int old_sel = -1;
3033 int new_sel = -1;
3034 int voltage;
3035 int i;
3036
3037 if (ops->set_voltage_time)
3038 return ops->set_voltage_time(rdev, old_uV, new_uV);
3039 else if (!ops->set_voltage_time_sel)
3040 return _regulator_set_voltage_time(rdev, old_uV, new_uV);
3041
3042 /* Currently requires operations to do this */
3043 if (!ops->list_voltage || !rdev->desc->n_voltages)
3044 return -EINVAL;
3045
3046 for (i = 0; i < rdev->desc->n_voltages; i++) {
3047 /* We only look for exact voltage matches here */
3048 voltage = regulator_list_voltage(regulator, i);
3049 if (voltage < 0)
3050 return -EINVAL;
3051 if (voltage == 0)
3052 continue;
3053 if (voltage == old_uV)
3054 old_sel = i;
3055 if (voltage == new_uV)
3056 new_sel = i;
3057 }
3058
3059 if (old_sel < 0 || new_sel < 0)
3060 return -EINVAL;
3061
3062 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3063}
3064EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3065
3066/**
3067 * regulator_set_voltage_time_sel - get raise/fall time
3068 * @rdev: regulator source device
3069 * @old_selector: selector for starting voltage
3070 * @new_selector: selector for target voltage
3071 *
3072 * Provided with the starting and target voltage selectors, this function
3073 * returns time in microseconds required to rise or fall to this new voltage
3074 *
3075 * Drivers providing ramp_delay in regulation_constraints can use this as their
3076 * set_voltage_time_sel() operation.
3077 */
3078int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3079 unsigned int old_selector,
3080 unsigned int new_selector)
3081{
3082 int old_volt, new_volt;
3083
3084 /* sanity check */
3085 if (!rdev->desc->ops->list_voltage)
3086 return -EINVAL;
3087
3088 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3089 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3090
3091 if (rdev->desc->ops->set_voltage_time)
3092 return rdev->desc->ops->set_voltage_time(rdev, old_volt,
3093 new_volt);
3094 else
3095 return _regulator_set_voltage_time(rdev, old_volt, new_volt);
3096}
3097EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
3098
3099/**
3100 * regulator_sync_voltage - re-apply last regulator output voltage
3101 * @regulator: regulator source
3102 *
3103 * Re-apply the last configured voltage. This is intended to be used
3104 * where some external control source the consumer is cooperating with
3105 * has caused the configured voltage to change.
3106 */
3107int regulator_sync_voltage(struct regulator *regulator)
3108{
3109 struct regulator_dev *rdev = regulator->rdev;
3110 int ret, min_uV, max_uV;
3111
3112 mutex_lock(&rdev->mutex);
3113
3114 if (!rdev->desc->ops->set_voltage &&
3115 !rdev->desc->ops->set_voltage_sel) {
3116 ret = -EINVAL;
3117 goto out;
3118 }
3119
3120 /* This is only going to work if we've had a voltage configured. */
3121 if (!regulator->min_uV && !regulator->max_uV) {
3122 ret = -EINVAL;
3123 goto out;
3124 }
3125
3126 min_uV = regulator->min_uV;
3127 max_uV = regulator->max_uV;
3128
3129 /* This should be a paranoia check... */
3130 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3131 if (ret < 0)
3132 goto out;
3133
3134 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
3135 if (ret < 0)
3136 goto out;
3137
3138 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3139
3140out:
3141 mutex_unlock(&rdev->mutex);
3142 return ret;
3143}
3144EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3145
3146static int _regulator_get_voltage(struct regulator_dev *rdev)
3147{
3148 int sel, ret;
3149 bool bypassed;
3150
3151 if (rdev->desc->ops->get_bypass) {
3152 ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
3153 if (ret < 0)
3154 return ret;
3155 if (bypassed) {
3156 /* if bypassed the regulator must have a supply */
3157 if (!rdev->supply) {
3158 rdev_err(rdev,
3159 "bypassed regulator has no supply!\n");
3160 return -EPROBE_DEFER;
3161 }
3162
3163 return _regulator_get_voltage(rdev->supply->rdev);
3164 }
3165 }
3166
3167 if (rdev->desc->ops->get_voltage_sel) {
3168 sel = rdev->desc->ops->get_voltage_sel(rdev);
3169 if (sel < 0)
3170 return sel;
3171 ret = rdev->desc->ops->list_voltage(rdev, sel);
3172 } else if (rdev->desc->ops->get_voltage) {
3173 ret = rdev->desc->ops->get_voltage(rdev);
3174 } else if (rdev->desc->ops->list_voltage) {
3175 ret = rdev->desc->ops->list_voltage(rdev, 0);
3176 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3177 ret = rdev->desc->fixed_uV;
3178 } else if (rdev->supply) {
3179 ret = _regulator_get_voltage(rdev->supply->rdev);
3180 } else {
3181 return -EINVAL;
3182 }
3183
3184 if (ret < 0)
3185 return ret;
3186 return ret - rdev->constraints->uV_offset;
3187}
3188
3189/**
3190 * regulator_get_voltage - get regulator output voltage
3191 * @regulator: regulator source
3192 *
3193 * This returns the current regulator voltage in uV.
3194 *
3195 * NOTE: If the regulator is disabled it will return the voltage value. This
3196 * function should not be used to determine regulator state.
3197 */
3198int regulator_get_voltage(struct regulator *regulator)
3199{
3200 int ret;
3201
3202 regulator_lock_supply(regulator->rdev);
3203
3204 ret = _regulator_get_voltage(regulator->rdev);
3205
3206 regulator_unlock_supply(regulator->rdev);
3207
3208 return ret;
3209}
3210EXPORT_SYMBOL_GPL(regulator_get_voltage);
3211
3212/**
3213 * regulator_set_current_limit - set regulator output current limit
3214 * @regulator: regulator source
3215 * @min_uA: Minimum supported current in uA
3216 * @max_uA: Maximum supported current in uA
3217 *
3218 * Sets current sink to the desired output current. This can be set during
3219 * any regulator state. IOW, regulator can be disabled or enabled.
3220 *
3221 * If the regulator is enabled then the current will change to the new value
3222 * immediately otherwise if the regulator is disabled the regulator will
3223 * output at the new current when enabled.
3224 *
3225 * NOTE: Regulator system constraints must be set for this regulator before
3226 * calling this function otherwise this call will fail.
3227 */
3228int regulator_set_current_limit(struct regulator *regulator,
3229 int min_uA, int max_uA)
3230{
3231 struct regulator_dev *rdev = regulator->rdev;
3232 int ret;
3233
3234 mutex_lock(&rdev->mutex);
3235
3236 /* sanity check */
3237 if (!rdev->desc->ops->set_current_limit) {
3238 ret = -EINVAL;
3239 goto out;
3240 }
3241
3242 /* constraints check */
3243 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3244 if (ret < 0)
3245 goto out;
3246
3247 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3248out:
3249 mutex_unlock(&rdev->mutex);
3250 return ret;
3251}
3252EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3253
3254static int _regulator_get_current_limit(struct regulator_dev *rdev)
3255{
3256 int ret;
3257
3258 mutex_lock(&rdev->mutex);
3259
3260 /* sanity check */
3261 if (!rdev->desc->ops->get_current_limit) {
3262 ret = -EINVAL;
3263 goto out;
3264 }
3265
3266 ret = rdev->desc->ops->get_current_limit(rdev);
3267out:
3268 mutex_unlock(&rdev->mutex);
3269 return ret;
3270}
3271
3272/**
3273 * regulator_get_current_limit - get regulator output current
3274 * @regulator: regulator source
3275 *
3276 * This returns the current supplied by the specified current sink in uA.
3277 *
3278 * NOTE: If the regulator is disabled it will return the current value. This
3279 * function should not be used to determine regulator state.
3280 */
3281int regulator_get_current_limit(struct regulator *regulator)
3282{
3283 return _regulator_get_current_limit(regulator->rdev);
3284}
3285EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3286
3287/**
3288 * regulator_set_mode - set regulator operating mode
3289 * @regulator: regulator source
3290 * @mode: operating mode - one of the REGULATOR_MODE constants
3291 *
3292 * Set regulator operating mode to increase regulator efficiency or improve
3293 * regulation performance.
3294 *
3295 * NOTE: Regulator system constraints must be set for this regulator before
3296 * calling this function otherwise this call will fail.
3297 */
3298int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3299{
3300 struct regulator_dev *rdev = regulator->rdev;
3301 int ret;
3302 int regulator_curr_mode;
3303
3304 mutex_lock(&rdev->mutex);
3305
3306 /* sanity check */
3307 if (!rdev->desc->ops->set_mode) {
3308 ret = -EINVAL;
3309 goto out;
3310 }
3311
3312 /* return if the same mode is requested */
3313 if (rdev->desc->ops->get_mode) {
3314 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3315 if (regulator_curr_mode == mode) {
3316 ret = 0;
3317 goto out;
3318 }
3319 }
3320
3321 /* constraints check */
3322 ret = regulator_mode_constrain(rdev, &mode);
3323 if (ret < 0)
3324 goto out;
3325
3326 ret = rdev->desc->ops->set_mode(rdev, mode);
3327out:
3328 mutex_unlock(&rdev->mutex);
3329 return ret;
3330}
3331EXPORT_SYMBOL_GPL(regulator_set_mode);
3332
3333static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3334{
3335 int ret;
3336
3337 mutex_lock(&rdev->mutex);
3338
3339 /* sanity check */
3340 if (!rdev->desc->ops->get_mode) {
3341 ret = -EINVAL;
3342 goto out;
3343 }
3344
3345 ret = rdev->desc->ops->get_mode(rdev);
3346out:
3347 mutex_unlock(&rdev->mutex);
3348 return ret;
3349}
3350
3351/**
3352 * regulator_get_mode - get regulator operating mode
3353 * @regulator: regulator source
3354 *
3355 * Get the current regulator operating mode.
3356 */
3357unsigned int regulator_get_mode(struct regulator *regulator)
3358{
3359 return _regulator_get_mode(regulator->rdev);
3360}
3361EXPORT_SYMBOL_GPL(regulator_get_mode);
3362
3363static int _regulator_get_error_flags(struct regulator_dev *rdev,
3364 unsigned int *flags)
3365{
3366 int ret;
3367
3368 mutex_lock(&rdev->mutex);
3369
3370 /* sanity check */
3371 if (!rdev->desc->ops->get_error_flags) {
3372 ret = -EINVAL;
3373 goto out;
3374 }
3375
3376 ret = rdev->desc->ops->get_error_flags(rdev, flags);
3377out:
3378 mutex_unlock(&rdev->mutex);
3379 return ret;
3380}
3381
3382/**
3383 * regulator_get_error_flags - get regulator error information
3384 * @regulator: regulator source
3385 * @flags: pointer to store error flags
3386 *
3387 * Get the current regulator error information.
3388 */
3389int regulator_get_error_flags(struct regulator *regulator,
3390 unsigned int *flags)
3391{
3392 return _regulator_get_error_flags(regulator->rdev, flags);
3393}
3394EXPORT_SYMBOL_GPL(regulator_get_error_flags);
3395
3396/**
3397 * regulator_set_load - set regulator load
3398 * @regulator: regulator source
3399 * @uA_load: load current
3400 *
3401 * Notifies the regulator core of a new device load. This is then used by
3402 * DRMS (if enabled by constraints) to set the most efficient regulator
3403 * operating mode for the new regulator loading.
3404 *
3405 * Consumer devices notify their supply regulator of the maximum power
3406 * they will require (can be taken from device datasheet in the power
3407 * consumption tables) when they change operational status and hence power
3408 * state. Examples of operational state changes that can affect power
3409 * consumption are :-
3410 *
3411 * o Device is opened / closed.
3412 * o Device I/O is about to begin or has just finished.
3413 * o Device is idling in between work.
3414 *
3415 * This information is also exported via sysfs to userspace.
3416 *
3417 * DRMS will sum the total requested load on the regulator and change
3418 * to the most efficient operating mode if platform constraints allow.
3419 *
3420 * On error a negative errno is returned.
3421 */
3422int regulator_set_load(struct regulator *regulator, int uA_load)
3423{
3424 struct regulator_dev *rdev = regulator->rdev;
3425 int ret;
3426
3427 mutex_lock(&rdev->mutex);
3428 regulator->uA_load = uA_load;
3429 ret = drms_uA_update(rdev);
3430 mutex_unlock(&rdev->mutex);
3431
3432 return ret;
3433}
3434EXPORT_SYMBOL_GPL(regulator_set_load);
3435
3436/**
3437 * regulator_allow_bypass - allow the regulator to go into bypass mode
3438 *
3439 * @regulator: Regulator to configure
3440 * @enable: enable or disable bypass mode
3441 *
3442 * Allow the regulator to go into bypass mode if all other consumers
3443 * for the regulator also enable bypass mode and the machine
3444 * constraints allow this. Bypass mode means that the regulator is
3445 * simply passing the input directly to the output with no regulation.
3446 */
3447int regulator_allow_bypass(struct regulator *regulator, bool enable)
3448{
3449 struct regulator_dev *rdev = regulator->rdev;
3450 int ret = 0;
3451
3452 if (!rdev->desc->ops->set_bypass)
3453 return 0;
3454
3455 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS))
3456 return 0;
3457
3458 mutex_lock(&rdev->mutex);
3459
3460 if (enable && !regulator->bypass) {
3461 rdev->bypass_count++;
3462
3463 if (rdev->bypass_count == rdev->open_count) {
3464 ret = rdev->desc->ops->set_bypass(rdev, enable);
3465 if (ret != 0)
3466 rdev->bypass_count--;
3467 }
3468
3469 } else if (!enable && regulator->bypass) {
3470 rdev->bypass_count--;
3471
3472 if (rdev->bypass_count != rdev->open_count) {
3473 ret = rdev->desc->ops->set_bypass(rdev, enable);
3474 if (ret != 0)
3475 rdev->bypass_count++;
3476 }
3477 }
3478
3479 if (ret == 0)
3480 regulator->bypass = enable;
3481
3482 mutex_unlock(&rdev->mutex);
3483
3484 return ret;
3485}
3486EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3487
3488/**
3489 * regulator_register_notifier - register regulator event notifier
3490 * @regulator: regulator source
3491 * @nb: notifier block
3492 *
3493 * Register notifier block to receive regulator events.
3494 */
3495int regulator_register_notifier(struct regulator *regulator,
3496 struct notifier_block *nb)
3497{
3498 return blocking_notifier_chain_register(®ulator->rdev->notifier,
3499 nb);
3500}
3501EXPORT_SYMBOL_GPL(regulator_register_notifier);
3502
3503/**
3504 * regulator_unregister_notifier - unregister regulator event notifier
3505 * @regulator: regulator source
3506 * @nb: notifier block
3507 *
3508 * Unregister regulator event notifier block.
3509 */
3510int regulator_unregister_notifier(struct regulator *regulator,
3511 struct notifier_block *nb)
3512{
3513 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
3514 nb);
3515}
3516EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3517
3518/* notify regulator consumers and downstream regulator consumers.
3519 * Note mutex must be held by caller.
3520 */
3521static int _notifier_call_chain(struct regulator_dev *rdev,
3522 unsigned long event, void *data)
3523{
3524 /* call rdev chain first */
3525 return blocking_notifier_call_chain(&rdev->notifier, event, data);
3526}
3527
3528/**
3529 * regulator_bulk_get - get multiple regulator consumers
3530 *
3531 * @dev: Device to supply
3532 * @num_consumers: Number of consumers to register
3533 * @consumers: Configuration of consumers; clients are stored here.
3534 *
3535 * @return 0 on success, an errno on failure.
3536 *
3537 * This helper function allows drivers to get several regulator
3538 * consumers in one operation. If any of the regulators cannot be
3539 * acquired then any regulators that were allocated will be freed
3540 * before returning to the caller.
3541 */
3542int regulator_bulk_get(struct device *dev, int num_consumers,
3543 struct regulator_bulk_data *consumers)
3544{
3545 int i;
3546 int ret;
3547
3548 for (i = 0; i < num_consumers; i++)
3549 consumers[i].consumer = NULL;
3550
3551 for (i = 0; i < num_consumers; i++) {
3552 consumers[i].consumer = regulator_get(dev,
3553 consumers[i].supply);
3554 if (IS_ERR(consumers[i].consumer)) {
3555 ret = PTR_ERR(consumers[i].consumer);
3556 dev_err(dev, "Failed to get supply '%s': %d\n",
3557 consumers[i].supply, ret);
3558 consumers[i].consumer = NULL;
3559 goto err;
3560 }
3561 }
3562
3563 return 0;
3564
3565err:
3566 while (--i >= 0)
3567 regulator_put(consumers[i].consumer);
3568
3569 return ret;
3570}
3571EXPORT_SYMBOL_GPL(regulator_bulk_get);
3572
3573static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3574{
3575 struct regulator_bulk_data *bulk = data;
3576
3577 bulk->ret = regulator_enable(bulk->consumer);
3578}
3579
3580/**
3581 * regulator_bulk_enable - enable multiple regulator consumers
3582 *
3583 * @num_consumers: Number of consumers
3584 * @consumers: Consumer data; clients are stored here.
3585 * @return 0 on success, an errno on failure
3586 *
3587 * This convenience API allows consumers to enable multiple regulator
3588 * clients in a single API call. If any consumers cannot be enabled
3589 * then any others that were enabled will be disabled again prior to
3590 * return.
3591 */
3592int regulator_bulk_enable(int num_consumers,
3593 struct regulator_bulk_data *consumers)
3594{
3595 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3596 int i;
3597 int ret = 0;
3598
3599 for (i = 0; i < num_consumers; i++) {
3600 if (consumers[i].consumer->always_on)
3601 consumers[i].ret = 0;
3602 else
3603 async_schedule_domain(regulator_bulk_enable_async,
3604 &consumers[i], &async_domain);
3605 }
3606
3607 async_synchronize_full_domain(&async_domain);
3608
3609 /* If any consumer failed we need to unwind any that succeeded */
3610 for (i = 0; i < num_consumers; i++) {
3611 if (consumers[i].ret != 0) {
3612 ret = consumers[i].ret;
3613 goto err;
3614 }
3615 }
3616
3617 return 0;
3618
3619err:
3620 for (i = 0; i < num_consumers; i++) {
3621 if (consumers[i].ret < 0)
3622 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3623 consumers[i].ret);
3624 else
3625 regulator_disable(consumers[i].consumer);
3626 }
3627
3628 return ret;
3629}
3630EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3631
3632/**
3633 * regulator_bulk_disable - disable multiple regulator consumers
3634 *
3635 * @num_consumers: Number of consumers
3636 * @consumers: Consumer data; clients are stored here.
3637 * @return 0 on success, an errno on failure
3638 *
3639 * This convenience API allows consumers to disable multiple regulator
3640 * clients in a single API call. If any consumers cannot be disabled
3641 * then any others that were disabled will be enabled again prior to
3642 * return.
3643 */
3644int regulator_bulk_disable(int num_consumers,
3645 struct regulator_bulk_data *consumers)
3646{
3647 int i;
3648 int ret, r;
3649
3650 for (i = num_consumers - 1; i >= 0; --i) {
3651 ret = regulator_disable(consumers[i].consumer);
3652 if (ret != 0)
3653 goto err;
3654 }
3655
3656 return 0;
3657
3658err:
3659 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3660 for (++i; i < num_consumers; ++i) {
3661 r = regulator_enable(consumers[i].consumer);
3662 if (r != 0)
3663 pr_err("Failed to reename %s: %d\n",
3664 consumers[i].supply, r);
3665 }
3666
3667 return ret;
3668}
3669EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3670
3671/**
3672 * regulator_bulk_force_disable - force disable multiple regulator consumers
3673 *
3674 * @num_consumers: Number of consumers
3675 * @consumers: Consumer data; clients are stored here.
3676 * @return 0 on success, an errno on failure
3677 *
3678 * This convenience API allows consumers to forcibly disable multiple regulator
3679 * clients in a single API call.
3680 * NOTE: This should be used for situations when device damage will
3681 * likely occur if the regulators are not disabled (e.g. over temp).
3682 * Although regulator_force_disable function call for some consumers can
3683 * return error numbers, the function is called for all consumers.
3684 */
3685int regulator_bulk_force_disable(int num_consumers,
3686 struct regulator_bulk_data *consumers)
3687{
3688 int i;
3689 int ret;
3690
3691 for (i = 0; i < num_consumers; i++)
3692 consumers[i].ret =
3693 regulator_force_disable(consumers[i].consumer);
3694
3695 for (i = 0; i < num_consumers; i++) {
3696 if (consumers[i].ret != 0) {
3697 ret = consumers[i].ret;
3698 goto out;
3699 }
3700 }
3701
3702 return 0;
3703out:
3704 return ret;
3705}
3706EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3707
3708/**
3709 * regulator_bulk_free - free multiple regulator consumers
3710 *
3711 * @num_consumers: Number of consumers
3712 * @consumers: Consumer data; clients are stored here.
3713 *
3714 * This convenience API allows consumers to free multiple regulator
3715 * clients in a single API call.
3716 */
3717void regulator_bulk_free(int num_consumers,
3718 struct regulator_bulk_data *consumers)
3719{
3720 int i;
3721
3722 for (i = 0; i < num_consumers; i++) {
3723 regulator_put(consumers[i].consumer);
3724 consumers[i].consumer = NULL;
3725 }
3726}
3727EXPORT_SYMBOL_GPL(regulator_bulk_free);
3728
3729/**
3730 * regulator_notifier_call_chain - call regulator event notifier
3731 * @rdev: regulator source
3732 * @event: notifier block
3733 * @data: callback-specific data.
3734 *
3735 * Called by regulator drivers to notify clients a regulator event has
3736 * occurred. We also notify regulator clients downstream.
3737 * Note lock must be held by caller.
3738 */
3739int regulator_notifier_call_chain(struct regulator_dev *rdev,
3740 unsigned long event, void *data)
3741{
3742 lockdep_assert_held_once(&rdev->mutex);
3743
3744 _notifier_call_chain(rdev, event, data);
3745 return NOTIFY_DONE;
3746
3747}
3748EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3749
3750/**
3751 * regulator_mode_to_status - convert a regulator mode into a status
3752 *
3753 * @mode: Mode to convert
3754 *
3755 * Convert a regulator mode into a status.
3756 */
3757int regulator_mode_to_status(unsigned int mode)
3758{
3759 switch (mode) {
3760 case REGULATOR_MODE_FAST:
3761 return REGULATOR_STATUS_FAST;
3762 case REGULATOR_MODE_NORMAL:
3763 return REGULATOR_STATUS_NORMAL;
3764 case REGULATOR_MODE_IDLE:
3765 return REGULATOR_STATUS_IDLE;
3766 case REGULATOR_MODE_STANDBY:
3767 return REGULATOR_STATUS_STANDBY;
3768 default:
3769 return REGULATOR_STATUS_UNDEFINED;
3770 }
3771}
3772EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3773
3774static struct attribute *regulator_dev_attrs[] = {
3775 &dev_attr_name.attr,
3776 &dev_attr_num_users.attr,
3777 &dev_attr_type.attr,
3778 &dev_attr_microvolts.attr,
3779 &dev_attr_microamps.attr,
3780 &dev_attr_opmode.attr,
3781 &dev_attr_state.attr,
3782 &dev_attr_status.attr,
3783 &dev_attr_bypass.attr,
3784 &dev_attr_requested_microamps.attr,
3785 &dev_attr_min_microvolts.attr,
3786 &dev_attr_max_microvolts.attr,
3787 &dev_attr_min_microamps.attr,
3788 &dev_attr_max_microamps.attr,
3789 &dev_attr_suspend_standby_state.attr,
3790 &dev_attr_suspend_mem_state.attr,
3791 &dev_attr_suspend_disk_state.attr,
3792 &dev_attr_suspend_standby_microvolts.attr,
3793 &dev_attr_suspend_mem_microvolts.attr,
3794 &dev_attr_suspend_disk_microvolts.attr,
3795 &dev_attr_suspend_standby_mode.attr,
3796 &dev_attr_suspend_mem_mode.attr,
3797 &dev_attr_suspend_disk_mode.attr,
3798 NULL
3799};
3800
3801/*
3802 * To avoid cluttering sysfs (and memory) with useless state, only
3803 * create attributes that can be meaningfully displayed.
3804 */
3805static umode_t regulator_attr_is_visible(struct kobject *kobj,
3806 struct attribute *attr, int idx)
3807{
3808 struct device *dev = kobj_to_dev(kobj);
3809 struct regulator_dev *rdev = dev_to_rdev(dev);
3810 const struct regulator_ops *ops = rdev->desc->ops;
3811 umode_t mode = attr->mode;
3812
3813 /* these three are always present */
3814 if (attr == &dev_attr_name.attr ||
3815 attr == &dev_attr_num_users.attr ||
3816 attr == &dev_attr_type.attr)
3817 return mode;
3818
3819 /* some attributes need specific methods to be displayed */
3820 if (attr == &dev_attr_microvolts.attr) {
3821 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3822 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3823 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3824 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3825 return mode;
3826 return 0;
3827 }
3828
3829 if (attr == &dev_attr_microamps.attr)
3830 return ops->get_current_limit ? mode : 0;
3831
3832 if (attr == &dev_attr_opmode.attr)
3833 return ops->get_mode ? mode : 0;
3834
3835 if (attr == &dev_attr_state.attr)
3836 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3837
3838 if (attr == &dev_attr_status.attr)
3839 return ops->get_status ? mode : 0;
3840
3841 if (attr == &dev_attr_bypass.attr)
3842 return ops->get_bypass ? mode : 0;
3843
3844 /* some attributes are type-specific */
3845 if (attr == &dev_attr_requested_microamps.attr)
3846 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
3847
3848 /* constraints need specific supporting methods */
3849 if (attr == &dev_attr_min_microvolts.attr ||
3850 attr == &dev_attr_max_microvolts.attr)
3851 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3852
3853 if (attr == &dev_attr_min_microamps.attr ||
3854 attr == &dev_attr_max_microamps.attr)
3855 return ops->set_current_limit ? mode : 0;
3856
3857 if (attr == &dev_attr_suspend_standby_state.attr ||
3858 attr == &dev_attr_suspend_mem_state.attr ||
3859 attr == &dev_attr_suspend_disk_state.attr)
3860 return mode;
3861
3862 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3863 attr == &dev_attr_suspend_mem_microvolts.attr ||
3864 attr == &dev_attr_suspend_disk_microvolts.attr)
3865 return ops->set_suspend_voltage ? mode : 0;
3866
3867 if (attr == &dev_attr_suspend_standby_mode.attr ||
3868 attr == &dev_attr_suspend_mem_mode.attr ||
3869 attr == &dev_attr_suspend_disk_mode.attr)
3870 return ops->set_suspend_mode ? mode : 0;
3871
3872 return mode;
3873}
3874
3875static const struct attribute_group regulator_dev_group = {
3876 .attrs = regulator_dev_attrs,
3877 .is_visible = regulator_attr_is_visible,
3878};
3879
3880static const struct attribute_group *regulator_dev_groups[] = {
3881 ®ulator_dev_group,
3882 NULL
3883};
3884
3885static void regulator_dev_release(struct device *dev)
3886{
3887 struct regulator_dev *rdev = dev_get_drvdata(dev);
3888
3889 kfree(rdev->constraints);
3890 of_node_put(rdev->dev.of_node);
3891 kfree(rdev);
3892}
3893
3894static struct class regulator_class = {
3895 .name = "regulator",
3896 .dev_release = regulator_dev_release,
3897 .dev_groups = regulator_dev_groups,
3898};
3899
3900static void rdev_init_debugfs(struct regulator_dev *rdev)
3901{
3902 struct device *parent = rdev->dev.parent;
3903 const char *rname = rdev_get_name(rdev);
3904 char name[NAME_MAX];
3905
3906 /* Avoid duplicate debugfs directory names */
3907 if (parent && rname == rdev->desc->name) {
3908 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3909 rname);
3910 rname = name;
3911 }
3912
3913 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
3914 if (!rdev->debugfs) {
3915 rdev_warn(rdev, "Failed to create debugfs directory\n");
3916 return;
3917 }
3918
3919 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3920 &rdev->use_count);
3921 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3922 &rdev->open_count);
3923 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3924 &rdev->bypass_count);
3925}
3926
3927static int regulator_register_resolve_supply(struct device *dev, void *data)
3928{
3929 struct regulator_dev *rdev = dev_to_rdev(dev);
3930
3931 if (regulator_resolve_supply(rdev))
3932 rdev_dbg(rdev, "unable to resolve supply\n");
3933
3934 return 0;
3935}
3936
3937/**
3938 * regulator_register - register regulator
3939 * @regulator_desc: regulator to register
3940 * @cfg: runtime configuration for regulator
3941 *
3942 * Called by regulator drivers to register a regulator.
3943 * Returns a valid pointer to struct regulator_dev on success
3944 * or an ERR_PTR() on error.
3945 */
3946struct regulator_dev *
3947regulator_register(const struct regulator_desc *regulator_desc,
3948 const struct regulator_config *cfg)
3949{
3950 const struct regulation_constraints *constraints = NULL;
3951 const struct regulator_init_data *init_data;
3952 struct regulator_config *config = NULL;
3953 static atomic_t regulator_no = ATOMIC_INIT(-1);
3954 struct regulator_dev *rdev;
3955 struct device *dev;
3956 int ret, i;
3957
3958 if (regulator_desc == NULL || cfg == NULL)
3959 return ERR_PTR(-EINVAL);
3960
3961 dev = cfg->dev;
3962 WARN_ON(!dev);
3963
3964 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3965 return ERR_PTR(-EINVAL);
3966
3967 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3968 regulator_desc->type != REGULATOR_CURRENT)
3969 return ERR_PTR(-EINVAL);
3970
3971 /* Only one of each should be implemented */
3972 WARN_ON(regulator_desc->ops->get_voltage &&
3973 regulator_desc->ops->get_voltage_sel);
3974 WARN_ON(regulator_desc->ops->set_voltage &&
3975 regulator_desc->ops->set_voltage_sel);
3976
3977 /* If we're using selectors we must implement list_voltage. */
3978 if (regulator_desc->ops->get_voltage_sel &&
3979 !regulator_desc->ops->list_voltage) {
3980 return ERR_PTR(-EINVAL);
3981 }
3982 if (regulator_desc->ops->set_voltage_sel &&
3983 !regulator_desc->ops->list_voltage) {
3984 return ERR_PTR(-EINVAL);
3985 }
3986
3987 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3988 if (rdev == NULL)
3989 return ERR_PTR(-ENOMEM);
3990
3991 /*
3992 * Duplicate the config so the driver could override it after
3993 * parsing init data.
3994 */
3995 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
3996 if (config == NULL) {
3997 kfree(rdev);
3998 return ERR_PTR(-ENOMEM);
3999 }
4000
4001 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
4002 &rdev->dev.of_node);
4003 if (!init_data) {
4004 init_data = config->init_data;
4005 rdev->dev.of_node = of_node_get(config->of_node);
4006 }
4007
4008 mutex_init(&rdev->mutex);
4009 rdev->reg_data = config->driver_data;
4010 rdev->owner = regulator_desc->owner;
4011 rdev->desc = regulator_desc;
4012 if (config->regmap)
4013 rdev->regmap = config->regmap;
4014 else if (dev_get_regmap(dev, NULL))
4015 rdev->regmap = dev_get_regmap(dev, NULL);
4016 else if (dev->parent)
4017 rdev->regmap = dev_get_regmap(dev->parent, NULL);
4018 INIT_LIST_HEAD(&rdev->consumer_list);
4019 INIT_LIST_HEAD(&rdev->list);
4020 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
4021 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
4022
4023 /* preform any regulator specific init */
4024 if (init_data && init_data->regulator_init) {
4025 ret = init_data->regulator_init(rdev->reg_data);
4026 if (ret < 0)
4027 goto clean;
4028 }
4029
4030 if ((config->ena_gpio || config->ena_gpio_initialized) &&
4031 gpio_is_valid(config->ena_gpio)) {
4032 mutex_lock(®ulator_list_mutex);
4033 ret = regulator_ena_gpio_request(rdev, config);
4034 mutex_unlock(®ulator_list_mutex);
4035 if (ret != 0) {
4036 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
4037 config->ena_gpio, ret);
4038 goto clean;
4039 }
4040 }
4041
4042 /* register with sysfs */
4043 rdev->dev.class = ®ulator_class;
4044 rdev->dev.parent = dev;
4045 dev_set_name(&rdev->dev, "regulator.%lu",
4046 (unsigned long) atomic_inc_return(®ulator_no));
4047
4048 /* set regulator constraints */
4049 if (init_data)
4050 constraints = &init_data->constraints;
4051
4052 if (init_data && init_data->supply_regulator)
4053 rdev->supply_name = init_data->supply_regulator;
4054 else if (regulator_desc->supply_name)
4055 rdev->supply_name = regulator_desc->supply_name;
4056
4057 /*
4058 * Attempt to resolve the regulator supply, if specified,
4059 * but don't return an error if we fail because we will try
4060 * to resolve it again later as more regulators are added.
4061 */
4062 if (regulator_resolve_supply(rdev))
4063 rdev_dbg(rdev, "unable to resolve supply\n");
4064
4065 ret = set_machine_constraints(rdev, constraints);
4066 if (ret < 0)
4067 goto wash;
4068
4069 /* add consumers devices */
4070 if (init_data) {
4071 mutex_lock(®ulator_list_mutex);
4072 for (i = 0; i < init_data->num_consumer_supplies; i++) {
4073 ret = set_consumer_device_supply(rdev,
4074 init_data->consumer_supplies[i].dev_name,
4075 init_data->consumer_supplies[i].supply);
4076 if (ret < 0) {
4077 mutex_unlock(®ulator_list_mutex);
4078 dev_err(dev, "Failed to set supply %s\n",
4079 init_data->consumer_supplies[i].supply);
4080 goto unset_supplies;
4081 }
4082 }
4083 mutex_unlock(®ulator_list_mutex);
4084 }
4085
4086 ret = device_register(&rdev->dev);
4087 if (ret != 0) {
4088 put_device(&rdev->dev);
4089 goto unset_supplies;
4090 }
4091
4092 dev_set_drvdata(&rdev->dev, rdev);
4093 rdev_init_debugfs(rdev);
4094
4095 /* try to resolve regulators supply since a new one was registered */
4096 class_for_each_device(®ulator_class, NULL, NULL,
4097 regulator_register_resolve_supply);
4098 kfree(config);
4099 return rdev;
4100
4101unset_supplies:
4102 mutex_lock(®ulator_list_mutex);
4103 unset_regulator_supplies(rdev);
4104 mutex_unlock(®ulator_list_mutex);
4105wash:
4106 kfree(rdev->constraints);
4107 mutex_lock(®ulator_list_mutex);
4108 regulator_ena_gpio_free(rdev);
4109 mutex_unlock(®ulator_list_mutex);
4110clean:
4111 kfree(rdev);
4112 kfree(config);
4113 return ERR_PTR(ret);
4114}
4115EXPORT_SYMBOL_GPL(regulator_register);
4116
4117/**
4118 * regulator_unregister - unregister regulator
4119 * @rdev: regulator to unregister
4120 *
4121 * Called by regulator drivers to unregister a regulator.
4122 */
4123void regulator_unregister(struct regulator_dev *rdev)
4124{
4125 if (rdev == NULL)
4126 return;
4127
4128 if (rdev->supply) {
4129 while (rdev->use_count--)
4130 regulator_disable(rdev->supply);
4131 regulator_put(rdev->supply);
4132 }
4133 mutex_lock(®ulator_list_mutex);
4134 debugfs_remove_recursive(rdev->debugfs);
4135 flush_work(&rdev->disable_work.work);
4136 WARN_ON(rdev->open_count);
4137 unset_regulator_supplies(rdev);
4138 list_del(&rdev->list);
4139 regulator_ena_gpio_free(rdev);
4140 mutex_unlock(®ulator_list_mutex);
4141 device_unregister(&rdev->dev);
4142}
4143EXPORT_SYMBOL_GPL(regulator_unregister);
4144
4145static int _regulator_suspend_prepare(struct device *dev, void *data)
4146{
4147 struct regulator_dev *rdev = dev_to_rdev(dev);
4148 const suspend_state_t *state = data;
4149 int ret;
4150
4151 mutex_lock(&rdev->mutex);
4152 ret = suspend_prepare(rdev, *state);
4153 mutex_unlock(&rdev->mutex);
4154
4155 return ret;
4156}
4157
4158/**
4159 * regulator_suspend_prepare - prepare regulators for system wide suspend
4160 * @state: system suspend state
4161 *
4162 * Configure each regulator with it's suspend operating parameters for state.
4163 * This will usually be called by machine suspend code prior to supending.
4164 */
4165int regulator_suspend_prepare(suspend_state_t state)
4166{
4167 /* ON is handled by regulator active state */
4168 if (state == PM_SUSPEND_ON)
4169 return -EINVAL;
4170
4171 return class_for_each_device(®ulator_class, NULL, &state,
4172 _regulator_suspend_prepare);
4173}
4174EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
4175
4176static int _regulator_suspend_finish(struct device *dev, void *data)
4177{
4178 struct regulator_dev *rdev = dev_to_rdev(dev);
4179 int ret;
4180
4181 mutex_lock(&rdev->mutex);
4182 if (rdev->use_count > 0 || rdev->constraints->always_on) {
4183 if (!_regulator_is_enabled(rdev)) {
4184 ret = _regulator_do_enable(rdev);
4185 if (ret)
4186 dev_err(dev,
4187 "Failed to resume regulator %d\n",
4188 ret);
4189 }
4190 } else {
4191 if (!have_full_constraints())
4192 goto unlock;
4193 if (!_regulator_is_enabled(rdev))
4194 goto unlock;
4195
4196 ret = _regulator_do_disable(rdev);
4197 if (ret)
4198 dev_err(dev, "Failed to suspend regulator %d\n", ret);
4199 }
4200unlock:
4201 mutex_unlock(&rdev->mutex);
4202
4203 /* Keep processing regulators in spite of any errors */
4204 return 0;
4205}
4206
4207/**
4208 * regulator_suspend_finish - resume regulators from system wide suspend
4209 *
4210 * Turn on regulators that might be turned off by regulator_suspend_prepare
4211 * and that should be turned on according to the regulators properties.
4212 */
4213int regulator_suspend_finish(void)
4214{
4215 return class_for_each_device(®ulator_class, NULL, NULL,
4216 _regulator_suspend_finish);
4217}
4218EXPORT_SYMBOL_GPL(regulator_suspend_finish);
4219
4220/**
4221 * regulator_has_full_constraints - the system has fully specified constraints
4222 *
4223 * Calling this function will cause the regulator API to disable all
4224 * regulators which have a zero use count and don't have an always_on
4225 * constraint in a late_initcall.
4226 *
4227 * The intention is that this will become the default behaviour in a
4228 * future kernel release so users are encouraged to use this facility
4229 * now.
4230 */
4231void regulator_has_full_constraints(void)
4232{
4233 has_full_constraints = 1;
4234}
4235EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4236
4237/**
4238 * rdev_get_drvdata - get rdev regulator driver data
4239 * @rdev: regulator
4240 *
4241 * Get rdev regulator driver private data. This call can be used in the
4242 * regulator driver context.
4243 */
4244void *rdev_get_drvdata(struct regulator_dev *rdev)
4245{
4246 return rdev->reg_data;
4247}
4248EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4249
4250/**
4251 * regulator_get_drvdata - get regulator driver data
4252 * @regulator: regulator
4253 *
4254 * Get regulator driver private data. This call can be used in the consumer
4255 * driver context when non API regulator specific functions need to be called.
4256 */
4257void *regulator_get_drvdata(struct regulator *regulator)
4258{
4259 return regulator->rdev->reg_data;
4260}
4261EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4262
4263/**
4264 * regulator_set_drvdata - set regulator driver data
4265 * @regulator: regulator
4266 * @data: data
4267 */
4268void regulator_set_drvdata(struct regulator *regulator, void *data)
4269{
4270 regulator->rdev->reg_data = data;
4271}
4272EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4273
4274/**
4275 * regulator_get_id - get regulator ID
4276 * @rdev: regulator
4277 */
4278int rdev_get_id(struct regulator_dev *rdev)
4279{
4280 return rdev->desc->id;
4281}
4282EXPORT_SYMBOL_GPL(rdev_get_id);
4283
4284struct device *rdev_get_dev(struct regulator_dev *rdev)
4285{
4286 return &rdev->dev;
4287}
4288EXPORT_SYMBOL_GPL(rdev_get_dev);
4289
4290void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4291{
4292 return reg_init_data->driver_data;
4293}
4294EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4295
4296#ifdef CONFIG_DEBUG_FS
4297static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
4298 size_t count, loff_t *ppos)
4299{
4300 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
4301 ssize_t len, ret = 0;
4302 struct regulator_map *map;
4303
4304 if (!buf)
4305 return -ENOMEM;
4306
4307 list_for_each_entry(map, ®ulator_map_list, list) {
4308 len = snprintf(buf + ret, PAGE_SIZE - ret,
4309 "%s -> %s.%s\n",
4310 rdev_get_name(map->regulator), map->dev_name,
4311 map->supply);
4312 if (len >= 0)
4313 ret += len;
4314 if (ret > PAGE_SIZE) {
4315 ret = PAGE_SIZE;
4316 break;
4317 }
4318 }
4319
4320 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
4321
4322 kfree(buf);
4323
4324 return ret;
4325}
4326#endif
4327
4328static const struct file_operations supply_map_fops = {
4329#ifdef CONFIG_DEBUG_FS
4330 .read = supply_map_read_file,
4331 .llseek = default_llseek,
4332#endif
4333};
4334
4335#ifdef CONFIG_DEBUG_FS
4336struct summary_data {
4337 struct seq_file *s;
4338 struct regulator_dev *parent;
4339 int level;
4340};
4341
4342static void regulator_summary_show_subtree(struct seq_file *s,
4343 struct regulator_dev *rdev,
4344 int level);
4345
4346static int regulator_summary_show_children(struct device *dev, void *data)
4347{
4348 struct regulator_dev *rdev = dev_to_rdev(dev);
4349 struct summary_data *summary_data = data;
4350
4351 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
4352 regulator_summary_show_subtree(summary_data->s, rdev,
4353 summary_data->level + 1);
4354
4355 return 0;
4356}
4357
4358static void regulator_summary_show_subtree(struct seq_file *s,
4359 struct regulator_dev *rdev,
4360 int level)
4361{
4362 struct regulation_constraints *c;
4363 struct regulator *consumer;
4364 struct summary_data summary_data;
4365
4366 if (!rdev)
4367 return;
4368
4369 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4370 level * 3 + 1, "",
4371 30 - level * 3, rdev_get_name(rdev),
4372 rdev->use_count, rdev->open_count, rdev->bypass_count);
4373
4374 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4375 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
4376
4377 c = rdev->constraints;
4378 if (c) {
4379 switch (rdev->desc->type) {
4380 case REGULATOR_VOLTAGE:
4381 seq_printf(s, "%5dmV %5dmV ",
4382 c->min_uV / 1000, c->max_uV / 1000);
4383 break;
4384 case REGULATOR_CURRENT:
4385 seq_printf(s, "%5dmA %5dmA ",
4386 c->min_uA / 1000, c->max_uA / 1000);
4387 break;
4388 }
4389 }
4390
4391 seq_puts(s, "\n");
4392
4393 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4394 if (consumer->dev && consumer->dev->class == ®ulator_class)
4395 continue;
4396
4397 seq_printf(s, "%*s%-*s ",
4398 (level + 1) * 3 + 1, "",
4399 30 - (level + 1) * 3,
4400 consumer->dev ? dev_name(consumer->dev) : "deviceless");
4401
4402 switch (rdev->desc->type) {
4403 case REGULATOR_VOLTAGE:
4404 seq_printf(s, "%37dmV %5dmV",
4405 consumer->min_uV / 1000,
4406 consumer->max_uV / 1000);
4407 break;
4408 case REGULATOR_CURRENT:
4409 break;
4410 }
4411
4412 seq_puts(s, "\n");
4413 }
4414
4415 summary_data.s = s;
4416 summary_data.level = level;
4417 summary_data.parent = rdev;
4418
4419 class_for_each_device(®ulator_class, NULL, &summary_data,
4420 regulator_summary_show_children);
4421}
4422
4423static int regulator_summary_show_roots(struct device *dev, void *data)
4424{
4425 struct regulator_dev *rdev = dev_to_rdev(dev);
4426 struct seq_file *s = data;
4427
4428 if (!rdev->supply)
4429 regulator_summary_show_subtree(s, rdev, 0);
4430
4431 return 0;
4432}
4433
4434static int regulator_summary_show(struct seq_file *s, void *data)
4435{
4436 seq_puts(s, " regulator use open bypass voltage current min max\n");
4437 seq_puts(s, "-------------------------------------------------------------------------------\n");
4438
4439 class_for_each_device(®ulator_class, NULL, s,
4440 regulator_summary_show_roots);
4441
4442 return 0;
4443}
4444
4445static int regulator_summary_open(struct inode *inode, struct file *file)
4446{
4447 return single_open(file, regulator_summary_show, inode->i_private);
4448}
4449#endif
4450
4451static const struct file_operations regulator_summary_fops = {
4452#ifdef CONFIG_DEBUG_FS
4453 .open = regulator_summary_open,
4454 .read = seq_read,
4455 .llseek = seq_lseek,
4456 .release = single_release,
4457#endif
4458};
4459
4460static int __init regulator_init(void)
4461{
4462 int ret;
4463
4464 ret = class_register(®ulator_class);
4465
4466 debugfs_root = debugfs_create_dir("regulator", NULL);
4467 if (!debugfs_root)
4468 pr_warn("regulator: Failed to create debugfs directory\n");
4469
4470 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4471 &supply_map_fops);
4472
4473 debugfs_create_file("regulator_summary", 0444, debugfs_root,
4474 NULL, ®ulator_summary_fops);
4475
4476 regulator_dummy_init();
4477
4478 return ret;
4479}
4480
4481/* init early to allow our consumers to complete system booting */
4482core_initcall(regulator_init);
4483
4484static int __init regulator_late_cleanup(struct device *dev, void *data)
4485{
4486 struct regulator_dev *rdev = dev_to_rdev(dev);
4487 const struct regulator_ops *ops = rdev->desc->ops;
4488 struct regulation_constraints *c = rdev->constraints;
4489 int enabled, ret;
4490
4491 if (c && c->always_on)
4492 return 0;
4493
4494 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS))
4495 return 0;
4496
4497 mutex_lock(&rdev->mutex);
4498
4499 if (rdev->use_count)
4500 goto unlock;
4501
4502 /* If we can't read the status assume it's on. */
4503 if (ops->is_enabled)
4504 enabled = ops->is_enabled(rdev);
4505 else
4506 enabled = 1;
4507
4508 if (!enabled)
4509 goto unlock;
4510
4511 if (have_full_constraints()) {
4512 /* We log since this may kill the system if it goes
4513 * wrong. */
4514 rdev_info(rdev, "disabling\n");
4515 ret = _regulator_do_disable(rdev);
4516 if (ret != 0)
4517 rdev_err(rdev, "couldn't disable: %d\n", ret);
4518 } else {
4519 /* The intention is that in future we will
4520 * assume that full constraints are provided
4521 * so warn even if we aren't going to do
4522 * anything here.
4523 */
4524 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4525 }
4526
4527unlock:
4528 mutex_unlock(&rdev->mutex);
4529
4530 return 0;
4531}
4532
4533static int __init regulator_init_complete(void)
4534{
4535 /*
4536 * Since DT doesn't provide an idiomatic mechanism for
4537 * enabling full constraints and since it's much more natural
4538 * with DT to provide them just assume that a DT enabled
4539 * system has full constraints.
4540 */
4541 if (of_have_populated_dt())
4542 has_full_constraints = true;
4543
4544 /* If we have a full configuration then disable any regulators
4545 * we have permission to change the status for and which are
4546 * not in use or always_on. This is effectively the default
4547 * for DT and ACPI as they have full constraints.
4548 */
4549 class_for_each_device(®ulator_class, NULL, NULL,
4550 regulator_late_cleanup);
4551
4552 return 0;
4553}
4554late_initcall_sync(regulator_init_complete);