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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/of.h>
27#include <linux/regmap.h>
28#include <linux/regulator/of_regulator.h>
29#include <linux/regulator/consumer.h>
30#include <linux/regulator/driver.h>
31#include <linux/regulator/machine.h>
32#include <linux/module.h>
33
34#define CREATE_TRACE_POINTS
35#include <trace/events/regulator.h>
36
37#include "dummy.h"
38
39#define rdev_crit(rdev, fmt, ...) \
40 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
41#define rdev_err(rdev, fmt, ...) \
42 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
43#define rdev_warn(rdev, fmt, ...) \
44 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
45#define rdev_info(rdev, fmt, ...) \
46 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
47#define rdev_dbg(rdev, fmt, ...) \
48 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
49
50static DEFINE_MUTEX(regulator_list_mutex);
51static LIST_HEAD(regulator_list);
52static LIST_HEAD(regulator_map_list);
53static bool has_full_constraints;
54static bool board_wants_dummy_regulator;
55
56static struct dentry *debugfs_root;
57
58/*
59 * struct regulator_map
60 *
61 * Used to provide symbolic supply names to devices.
62 */
63struct regulator_map {
64 struct list_head list;
65 const char *dev_name; /* The dev_name() for the consumer */
66 const char *supply;
67 struct regulator_dev *regulator;
68};
69
70/*
71 * struct regulator
72 *
73 * One for each consumer device.
74 */
75struct regulator {
76 struct device *dev;
77 struct list_head list;
78 unsigned int always_on:1;
79 int uA_load;
80 int min_uV;
81 int max_uV;
82 char *supply_name;
83 struct device_attribute dev_attr;
84 struct regulator_dev *rdev;
85 struct dentry *debugfs;
86};
87
88static int _regulator_is_enabled(struct regulator_dev *rdev);
89static int _regulator_disable(struct regulator_dev *rdev);
90static int _regulator_get_voltage(struct regulator_dev *rdev);
91static int _regulator_get_current_limit(struct regulator_dev *rdev);
92static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
93static void _notifier_call_chain(struct regulator_dev *rdev,
94 unsigned long event, void *data);
95static int _regulator_do_set_voltage(struct regulator_dev *rdev,
96 int min_uV, int max_uV);
97static struct regulator *create_regulator(struct regulator_dev *rdev,
98 struct device *dev,
99 const char *supply_name);
100
101static const char *rdev_get_name(struct regulator_dev *rdev)
102{
103 if (rdev->constraints && rdev->constraints->name)
104 return rdev->constraints->name;
105 else if (rdev->desc->name)
106 return rdev->desc->name;
107 else
108 return "";
109}
110
111/* gets the regulator for a given consumer device */
112static struct regulator *get_device_regulator(struct device *dev)
113{
114 struct regulator *regulator = NULL;
115 struct regulator_dev *rdev;
116
117 mutex_lock(®ulator_list_mutex);
118 list_for_each_entry(rdev, ®ulator_list, list) {
119 mutex_lock(&rdev->mutex);
120 list_for_each_entry(regulator, &rdev->consumer_list, list) {
121 if (regulator->dev == dev) {
122 mutex_unlock(&rdev->mutex);
123 mutex_unlock(®ulator_list_mutex);
124 return regulator;
125 }
126 }
127 mutex_unlock(&rdev->mutex);
128 }
129 mutex_unlock(®ulator_list_mutex);
130 return NULL;
131}
132
133/**
134 * of_get_regulator - get a regulator device node based on supply name
135 * @dev: Device pointer for the consumer (of regulator) device
136 * @supply: regulator supply name
137 *
138 * Extract the regulator device node corresponding to the supply name.
139 * retruns the device node corresponding to the regulator if found, else
140 * returns NULL.
141 */
142static struct device_node *of_get_regulator(struct device *dev, const char *supply)
143{
144 struct device_node *regnode = NULL;
145 char prop_name[32]; /* 32 is max size of property name */
146
147 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
148
149 snprintf(prop_name, 32, "%s-supply", supply);
150 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
151
152 if (!regnode) {
153 dev_dbg(dev, "Looking up %s property in node %s failed",
154 prop_name, dev->of_node->full_name);
155 return NULL;
156 }
157 return regnode;
158}
159
160static int _regulator_can_change_status(struct regulator_dev *rdev)
161{
162 if (!rdev->constraints)
163 return 0;
164
165 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
166 return 1;
167 else
168 return 0;
169}
170
171/* Platform voltage constraint check */
172static int regulator_check_voltage(struct regulator_dev *rdev,
173 int *min_uV, int *max_uV)
174{
175 BUG_ON(*min_uV > *max_uV);
176
177 if (!rdev->constraints) {
178 rdev_err(rdev, "no constraints\n");
179 return -ENODEV;
180 }
181 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
182 rdev_err(rdev, "operation not allowed\n");
183 return -EPERM;
184 }
185
186 if (*max_uV > rdev->constraints->max_uV)
187 *max_uV = rdev->constraints->max_uV;
188 if (*min_uV < rdev->constraints->min_uV)
189 *min_uV = rdev->constraints->min_uV;
190
191 if (*min_uV > *max_uV) {
192 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
193 *min_uV, *max_uV);
194 return -EINVAL;
195 }
196
197 return 0;
198}
199
200/* Make sure we select a voltage that suits the needs of all
201 * regulator consumers
202 */
203static int regulator_check_consumers(struct regulator_dev *rdev,
204 int *min_uV, int *max_uV)
205{
206 struct regulator *regulator;
207
208 list_for_each_entry(regulator, &rdev->consumer_list, list) {
209 /*
210 * Assume consumers that didn't say anything are OK
211 * with anything in the constraint range.
212 */
213 if (!regulator->min_uV && !regulator->max_uV)
214 continue;
215
216 if (*max_uV > regulator->max_uV)
217 *max_uV = regulator->max_uV;
218 if (*min_uV < regulator->min_uV)
219 *min_uV = regulator->min_uV;
220 }
221
222 if (*min_uV > *max_uV)
223 return -EINVAL;
224
225 return 0;
226}
227
228/* current constraint check */
229static int regulator_check_current_limit(struct regulator_dev *rdev,
230 int *min_uA, int *max_uA)
231{
232 BUG_ON(*min_uA > *max_uA);
233
234 if (!rdev->constraints) {
235 rdev_err(rdev, "no constraints\n");
236 return -ENODEV;
237 }
238 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
239 rdev_err(rdev, "operation not allowed\n");
240 return -EPERM;
241 }
242
243 if (*max_uA > rdev->constraints->max_uA)
244 *max_uA = rdev->constraints->max_uA;
245 if (*min_uA < rdev->constraints->min_uA)
246 *min_uA = rdev->constraints->min_uA;
247
248 if (*min_uA > *max_uA) {
249 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
250 *min_uA, *max_uA);
251 return -EINVAL;
252 }
253
254 return 0;
255}
256
257/* operating mode constraint check */
258static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
259{
260 switch (*mode) {
261 case REGULATOR_MODE_FAST:
262 case REGULATOR_MODE_NORMAL:
263 case REGULATOR_MODE_IDLE:
264 case REGULATOR_MODE_STANDBY:
265 break;
266 default:
267 rdev_err(rdev, "invalid mode %x specified\n", *mode);
268 return -EINVAL;
269 }
270
271 if (!rdev->constraints) {
272 rdev_err(rdev, "no constraints\n");
273 return -ENODEV;
274 }
275 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
276 rdev_err(rdev, "operation not allowed\n");
277 return -EPERM;
278 }
279
280 /* The modes are bitmasks, the most power hungry modes having
281 * the lowest values. If the requested mode isn't supported
282 * try higher modes. */
283 while (*mode) {
284 if (rdev->constraints->valid_modes_mask & *mode)
285 return 0;
286 *mode /= 2;
287 }
288
289 return -EINVAL;
290}
291
292/* dynamic regulator mode switching constraint check */
293static int regulator_check_drms(struct regulator_dev *rdev)
294{
295 if (!rdev->constraints) {
296 rdev_err(rdev, "no constraints\n");
297 return -ENODEV;
298 }
299 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
300 rdev_err(rdev, "operation not allowed\n");
301 return -EPERM;
302 }
303 return 0;
304}
305
306static ssize_t device_requested_uA_show(struct device *dev,
307 struct device_attribute *attr, char *buf)
308{
309 struct regulator *regulator;
310
311 regulator = get_device_regulator(dev);
312 if (regulator == NULL)
313 return 0;
314
315 return sprintf(buf, "%d\n", regulator->uA_load);
316}
317
318static ssize_t regulator_uV_show(struct device *dev,
319 struct device_attribute *attr, char *buf)
320{
321 struct regulator_dev *rdev = dev_get_drvdata(dev);
322 ssize_t ret;
323
324 mutex_lock(&rdev->mutex);
325 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
326 mutex_unlock(&rdev->mutex);
327
328 return ret;
329}
330static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
331
332static ssize_t regulator_uA_show(struct device *dev,
333 struct device_attribute *attr, char *buf)
334{
335 struct regulator_dev *rdev = dev_get_drvdata(dev);
336
337 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
338}
339static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
340
341static ssize_t regulator_name_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, "%s\n", rdev_get_name(rdev));
347}
348
349static ssize_t regulator_print_opmode(char *buf, int mode)
350{
351 switch (mode) {
352 case REGULATOR_MODE_FAST:
353 return sprintf(buf, "fast\n");
354 case REGULATOR_MODE_NORMAL:
355 return sprintf(buf, "normal\n");
356 case REGULATOR_MODE_IDLE:
357 return sprintf(buf, "idle\n");
358 case REGULATOR_MODE_STANDBY:
359 return sprintf(buf, "standby\n");
360 }
361 return sprintf(buf, "unknown\n");
362}
363
364static ssize_t regulator_opmode_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
366{
367 struct regulator_dev *rdev = dev_get_drvdata(dev);
368
369 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
370}
371static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
372
373static ssize_t regulator_print_state(char *buf, int state)
374{
375 if (state > 0)
376 return sprintf(buf, "enabled\n");
377 else if (state == 0)
378 return sprintf(buf, "disabled\n");
379 else
380 return sprintf(buf, "unknown\n");
381}
382
383static ssize_t regulator_state_show(struct device *dev,
384 struct device_attribute *attr, char *buf)
385{
386 struct regulator_dev *rdev = dev_get_drvdata(dev);
387 ssize_t ret;
388
389 mutex_lock(&rdev->mutex);
390 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
391 mutex_unlock(&rdev->mutex);
392
393 return ret;
394}
395static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
396
397static ssize_t regulator_status_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
399{
400 struct regulator_dev *rdev = dev_get_drvdata(dev);
401 int status;
402 char *label;
403
404 status = rdev->desc->ops->get_status(rdev);
405 if (status < 0)
406 return status;
407
408 switch (status) {
409 case REGULATOR_STATUS_OFF:
410 label = "off";
411 break;
412 case REGULATOR_STATUS_ON:
413 label = "on";
414 break;
415 case REGULATOR_STATUS_ERROR:
416 label = "error";
417 break;
418 case REGULATOR_STATUS_FAST:
419 label = "fast";
420 break;
421 case REGULATOR_STATUS_NORMAL:
422 label = "normal";
423 break;
424 case REGULATOR_STATUS_IDLE:
425 label = "idle";
426 break;
427 case REGULATOR_STATUS_STANDBY:
428 label = "standby";
429 break;
430 default:
431 return -ERANGE;
432 }
433
434 return sprintf(buf, "%s\n", label);
435}
436static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
437
438static ssize_t regulator_min_uA_show(struct device *dev,
439 struct device_attribute *attr, char *buf)
440{
441 struct regulator_dev *rdev = dev_get_drvdata(dev);
442
443 if (!rdev->constraints)
444 return sprintf(buf, "constraint not defined\n");
445
446 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
447}
448static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
449
450static ssize_t regulator_max_uA_show(struct device *dev,
451 struct device_attribute *attr, char *buf)
452{
453 struct regulator_dev *rdev = dev_get_drvdata(dev);
454
455 if (!rdev->constraints)
456 return sprintf(buf, "constraint not defined\n");
457
458 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
459}
460static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
461
462static ssize_t regulator_min_uV_show(struct device *dev,
463 struct device_attribute *attr, char *buf)
464{
465 struct regulator_dev *rdev = dev_get_drvdata(dev);
466
467 if (!rdev->constraints)
468 return sprintf(buf, "constraint not defined\n");
469
470 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
471}
472static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
473
474static ssize_t regulator_max_uV_show(struct device *dev,
475 struct device_attribute *attr, char *buf)
476{
477 struct regulator_dev *rdev = dev_get_drvdata(dev);
478
479 if (!rdev->constraints)
480 return sprintf(buf, "constraint not defined\n");
481
482 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
483}
484static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
485
486static ssize_t regulator_total_uA_show(struct device *dev,
487 struct device_attribute *attr, char *buf)
488{
489 struct regulator_dev *rdev = dev_get_drvdata(dev);
490 struct regulator *regulator;
491 int uA = 0;
492
493 mutex_lock(&rdev->mutex);
494 list_for_each_entry(regulator, &rdev->consumer_list, list)
495 uA += regulator->uA_load;
496 mutex_unlock(&rdev->mutex);
497 return sprintf(buf, "%d\n", uA);
498}
499static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
500
501static ssize_t regulator_num_users_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
503{
504 struct regulator_dev *rdev = dev_get_drvdata(dev);
505 return sprintf(buf, "%d\n", rdev->use_count);
506}
507
508static ssize_t regulator_type_show(struct device *dev,
509 struct device_attribute *attr, char *buf)
510{
511 struct regulator_dev *rdev = dev_get_drvdata(dev);
512
513 switch (rdev->desc->type) {
514 case REGULATOR_VOLTAGE:
515 return sprintf(buf, "voltage\n");
516 case REGULATOR_CURRENT:
517 return sprintf(buf, "current\n");
518 }
519 return sprintf(buf, "unknown\n");
520}
521
522static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
523 struct device_attribute *attr, char *buf)
524{
525 struct regulator_dev *rdev = dev_get_drvdata(dev);
526
527 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
528}
529static DEVICE_ATTR(suspend_mem_microvolts, 0444,
530 regulator_suspend_mem_uV_show, NULL);
531
532static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
533 struct device_attribute *attr, char *buf)
534{
535 struct regulator_dev *rdev = dev_get_drvdata(dev);
536
537 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
538}
539static DEVICE_ATTR(suspend_disk_microvolts, 0444,
540 regulator_suspend_disk_uV_show, NULL);
541
542static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
543 struct device_attribute *attr, char *buf)
544{
545 struct regulator_dev *rdev = dev_get_drvdata(dev);
546
547 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
548}
549static DEVICE_ATTR(suspend_standby_microvolts, 0444,
550 regulator_suspend_standby_uV_show, NULL);
551
552static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
553 struct device_attribute *attr, char *buf)
554{
555 struct regulator_dev *rdev = dev_get_drvdata(dev);
556
557 return regulator_print_opmode(buf,
558 rdev->constraints->state_mem.mode);
559}
560static DEVICE_ATTR(suspend_mem_mode, 0444,
561 regulator_suspend_mem_mode_show, NULL);
562
563static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
564 struct device_attribute *attr, char *buf)
565{
566 struct regulator_dev *rdev = dev_get_drvdata(dev);
567
568 return regulator_print_opmode(buf,
569 rdev->constraints->state_disk.mode);
570}
571static DEVICE_ATTR(suspend_disk_mode, 0444,
572 regulator_suspend_disk_mode_show, NULL);
573
574static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
575 struct device_attribute *attr, char *buf)
576{
577 struct regulator_dev *rdev = dev_get_drvdata(dev);
578
579 return regulator_print_opmode(buf,
580 rdev->constraints->state_standby.mode);
581}
582static DEVICE_ATTR(suspend_standby_mode, 0444,
583 regulator_suspend_standby_mode_show, NULL);
584
585static ssize_t regulator_suspend_mem_state_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
587{
588 struct regulator_dev *rdev = dev_get_drvdata(dev);
589
590 return regulator_print_state(buf,
591 rdev->constraints->state_mem.enabled);
592}
593static DEVICE_ATTR(suspend_mem_state, 0444,
594 regulator_suspend_mem_state_show, NULL);
595
596static ssize_t regulator_suspend_disk_state_show(struct device *dev,
597 struct device_attribute *attr, char *buf)
598{
599 struct regulator_dev *rdev = dev_get_drvdata(dev);
600
601 return regulator_print_state(buf,
602 rdev->constraints->state_disk.enabled);
603}
604static DEVICE_ATTR(suspend_disk_state, 0444,
605 regulator_suspend_disk_state_show, NULL);
606
607static ssize_t regulator_suspend_standby_state_show(struct device *dev,
608 struct device_attribute *attr, char *buf)
609{
610 struct regulator_dev *rdev = dev_get_drvdata(dev);
611
612 return regulator_print_state(buf,
613 rdev->constraints->state_standby.enabled);
614}
615static DEVICE_ATTR(suspend_standby_state, 0444,
616 regulator_suspend_standby_state_show, NULL);
617
618
619/*
620 * These are the only attributes are present for all regulators.
621 * Other attributes are a function of regulator functionality.
622 */
623static struct device_attribute regulator_dev_attrs[] = {
624 __ATTR(name, 0444, regulator_name_show, NULL),
625 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
626 __ATTR(type, 0444, regulator_type_show, NULL),
627 __ATTR_NULL,
628};
629
630static void regulator_dev_release(struct device *dev)
631{
632 struct regulator_dev *rdev = dev_get_drvdata(dev);
633 kfree(rdev);
634}
635
636static struct class regulator_class = {
637 .name = "regulator",
638 .dev_release = regulator_dev_release,
639 .dev_attrs = regulator_dev_attrs,
640};
641
642/* Calculate the new optimum regulator operating mode based on the new total
643 * consumer load. All locks held by caller */
644static void drms_uA_update(struct regulator_dev *rdev)
645{
646 struct regulator *sibling;
647 int current_uA = 0, output_uV, input_uV, err;
648 unsigned int mode;
649
650 err = regulator_check_drms(rdev);
651 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
652 (!rdev->desc->ops->get_voltage &&
653 !rdev->desc->ops->get_voltage_sel) ||
654 !rdev->desc->ops->set_mode)
655 return;
656
657 /* get output voltage */
658 output_uV = _regulator_get_voltage(rdev);
659 if (output_uV <= 0)
660 return;
661
662 /* get input voltage */
663 input_uV = 0;
664 if (rdev->supply)
665 input_uV = regulator_get_voltage(rdev->supply);
666 if (input_uV <= 0)
667 input_uV = rdev->constraints->input_uV;
668 if (input_uV <= 0)
669 return;
670
671 /* calc total requested load */
672 list_for_each_entry(sibling, &rdev->consumer_list, list)
673 current_uA += sibling->uA_load;
674
675 /* now get the optimum mode for our new total regulator load */
676 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
677 output_uV, current_uA);
678
679 /* check the new mode is allowed */
680 err = regulator_mode_constrain(rdev, &mode);
681 if (err == 0)
682 rdev->desc->ops->set_mode(rdev, mode);
683}
684
685static int suspend_set_state(struct regulator_dev *rdev,
686 struct regulator_state *rstate)
687{
688 int ret = 0;
689
690 /* If we have no suspend mode configration don't set anything;
691 * only warn if the driver implements set_suspend_voltage or
692 * set_suspend_mode callback.
693 */
694 if (!rstate->enabled && !rstate->disabled) {
695 if (rdev->desc->ops->set_suspend_voltage ||
696 rdev->desc->ops->set_suspend_mode)
697 rdev_warn(rdev, "No configuration\n");
698 return 0;
699 }
700
701 if (rstate->enabled && rstate->disabled) {
702 rdev_err(rdev, "invalid configuration\n");
703 return -EINVAL;
704 }
705
706 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
707 ret = rdev->desc->ops->set_suspend_enable(rdev);
708 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
709 ret = rdev->desc->ops->set_suspend_disable(rdev);
710 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
711 ret = 0;
712
713 if (ret < 0) {
714 rdev_err(rdev, "failed to enabled/disable\n");
715 return ret;
716 }
717
718 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
719 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
720 if (ret < 0) {
721 rdev_err(rdev, "failed to set voltage\n");
722 return ret;
723 }
724 }
725
726 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
727 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
728 if (ret < 0) {
729 rdev_err(rdev, "failed to set mode\n");
730 return ret;
731 }
732 }
733 return ret;
734}
735
736/* locks held by caller */
737static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
738{
739 if (!rdev->constraints)
740 return -EINVAL;
741
742 switch (state) {
743 case PM_SUSPEND_STANDBY:
744 return suspend_set_state(rdev,
745 &rdev->constraints->state_standby);
746 case PM_SUSPEND_MEM:
747 return suspend_set_state(rdev,
748 &rdev->constraints->state_mem);
749 case PM_SUSPEND_MAX:
750 return suspend_set_state(rdev,
751 &rdev->constraints->state_disk);
752 default:
753 return -EINVAL;
754 }
755}
756
757static void print_constraints(struct regulator_dev *rdev)
758{
759 struct regulation_constraints *constraints = rdev->constraints;
760 char buf[80] = "";
761 int count = 0;
762 int ret;
763
764 if (constraints->min_uV && constraints->max_uV) {
765 if (constraints->min_uV == constraints->max_uV)
766 count += sprintf(buf + count, "%d mV ",
767 constraints->min_uV / 1000);
768 else
769 count += sprintf(buf + count, "%d <--> %d mV ",
770 constraints->min_uV / 1000,
771 constraints->max_uV / 1000);
772 }
773
774 if (!constraints->min_uV ||
775 constraints->min_uV != constraints->max_uV) {
776 ret = _regulator_get_voltage(rdev);
777 if (ret > 0)
778 count += sprintf(buf + count, "at %d mV ", ret / 1000);
779 }
780
781 if (constraints->uV_offset)
782 count += sprintf(buf, "%dmV offset ",
783 constraints->uV_offset / 1000);
784
785 if (constraints->min_uA && constraints->max_uA) {
786 if (constraints->min_uA == constraints->max_uA)
787 count += sprintf(buf + count, "%d mA ",
788 constraints->min_uA / 1000);
789 else
790 count += sprintf(buf + count, "%d <--> %d mA ",
791 constraints->min_uA / 1000,
792 constraints->max_uA / 1000);
793 }
794
795 if (!constraints->min_uA ||
796 constraints->min_uA != constraints->max_uA) {
797 ret = _regulator_get_current_limit(rdev);
798 if (ret > 0)
799 count += sprintf(buf + count, "at %d mA ", ret / 1000);
800 }
801
802 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
803 count += sprintf(buf + count, "fast ");
804 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
805 count += sprintf(buf + count, "normal ");
806 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
807 count += sprintf(buf + count, "idle ");
808 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
809 count += sprintf(buf + count, "standby");
810
811 rdev_info(rdev, "%s\n", buf);
812
813 if ((constraints->min_uV != constraints->max_uV) &&
814 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
815 rdev_warn(rdev,
816 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
817}
818
819static int machine_constraints_voltage(struct regulator_dev *rdev,
820 struct regulation_constraints *constraints)
821{
822 struct regulator_ops *ops = rdev->desc->ops;
823 int ret;
824
825 /* do we need to apply the constraint voltage */
826 if (rdev->constraints->apply_uV &&
827 rdev->constraints->min_uV == rdev->constraints->max_uV) {
828 ret = _regulator_do_set_voltage(rdev,
829 rdev->constraints->min_uV,
830 rdev->constraints->max_uV);
831 if (ret < 0) {
832 rdev_err(rdev, "failed to apply %duV constraint\n",
833 rdev->constraints->min_uV);
834 return ret;
835 }
836 }
837
838 /* constrain machine-level voltage specs to fit
839 * the actual range supported by this regulator.
840 */
841 if (ops->list_voltage && rdev->desc->n_voltages) {
842 int count = rdev->desc->n_voltages;
843 int i;
844 int min_uV = INT_MAX;
845 int max_uV = INT_MIN;
846 int cmin = constraints->min_uV;
847 int cmax = constraints->max_uV;
848
849 /* it's safe to autoconfigure fixed-voltage supplies
850 and the constraints are used by list_voltage. */
851 if (count == 1 && !cmin) {
852 cmin = 1;
853 cmax = INT_MAX;
854 constraints->min_uV = cmin;
855 constraints->max_uV = cmax;
856 }
857
858 /* voltage constraints are optional */
859 if ((cmin == 0) && (cmax == 0))
860 return 0;
861
862 /* else require explicit machine-level constraints */
863 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
864 rdev_err(rdev, "invalid voltage constraints\n");
865 return -EINVAL;
866 }
867
868 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
869 for (i = 0; i < count; i++) {
870 int value;
871
872 value = ops->list_voltage(rdev, i);
873 if (value <= 0)
874 continue;
875
876 /* maybe adjust [min_uV..max_uV] */
877 if (value >= cmin && value < min_uV)
878 min_uV = value;
879 if (value <= cmax && value > max_uV)
880 max_uV = value;
881 }
882
883 /* final: [min_uV..max_uV] valid iff constraints valid */
884 if (max_uV < min_uV) {
885 rdev_err(rdev, "unsupportable voltage constraints\n");
886 return -EINVAL;
887 }
888
889 /* use regulator's subset of machine constraints */
890 if (constraints->min_uV < min_uV) {
891 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
892 constraints->min_uV, min_uV);
893 constraints->min_uV = min_uV;
894 }
895 if (constraints->max_uV > max_uV) {
896 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
897 constraints->max_uV, max_uV);
898 constraints->max_uV = max_uV;
899 }
900 }
901
902 return 0;
903}
904
905/**
906 * set_machine_constraints - sets regulator constraints
907 * @rdev: regulator source
908 * @constraints: constraints to apply
909 *
910 * Allows platform initialisation code to define and constrain
911 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
912 * Constraints *must* be set by platform code in order for some
913 * regulator operations to proceed i.e. set_voltage, set_current_limit,
914 * set_mode.
915 */
916static int set_machine_constraints(struct regulator_dev *rdev,
917 const struct regulation_constraints *constraints)
918{
919 int ret = 0;
920 struct regulator_ops *ops = rdev->desc->ops;
921
922 if (constraints)
923 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
924 GFP_KERNEL);
925 else
926 rdev->constraints = kzalloc(sizeof(*constraints),
927 GFP_KERNEL);
928 if (!rdev->constraints)
929 return -ENOMEM;
930
931 ret = machine_constraints_voltage(rdev, rdev->constraints);
932 if (ret != 0)
933 goto out;
934
935 /* do we need to setup our suspend state */
936 if (rdev->constraints->initial_state) {
937 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
938 if (ret < 0) {
939 rdev_err(rdev, "failed to set suspend state\n");
940 goto out;
941 }
942 }
943
944 if (rdev->constraints->initial_mode) {
945 if (!ops->set_mode) {
946 rdev_err(rdev, "no set_mode operation\n");
947 ret = -EINVAL;
948 goto out;
949 }
950
951 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
952 if (ret < 0) {
953 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
954 goto out;
955 }
956 }
957
958 /* If the constraints say the regulator should be on at this point
959 * and we have control then make sure it is enabled.
960 */
961 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
962 ops->enable) {
963 ret = ops->enable(rdev);
964 if (ret < 0) {
965 rdev_err(rdev, "failed to enable\n");
966 goto out;
967 }
968 }
969
970 print_constraints(rdev);
971 return 0;
972out:
973 kfree(rdev->constraints);
974 rdev->constraints = NULL;
975 return ret;
976}
977
978/**
979 * set_supply - set regulator supply regulator
980 * @rdev: regulator name
981 * @supply_rdev: supply regulator name
982 *
983 * Called by platform initialisation code to set the supply regulator for this
984 * regulator. This ensures that a regulators supply will also be enabled by the
985 * core if it's child is enabled.
986 */
987static int set_supply(struct regulator_dev *rdev,
988 struct regulator_dev *supply_rdev)
989{
990 int err;
991
992 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
993
994 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
995 if (rdev->supply == NULL) {
996 err = -ENOMEM;
997 return err;
998 }
999
1000 return 0;
1001}
1002
1003/**
1004 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1005 * @rdev: regulator source
1006 * @consumer_dev_name: dev_name() string for device supply applies to
1007 * @supply: symbolic name for supply
1008 *
1009 * Allows platform initialisation code to map physical regulator
1010 * sources to symbolic names for supplies for use by devices. Devices
1011 * should use these symbolic names to request regulators, avoiding the
1012 * need to provide board-specific regulator names as platform data.
1013 */
1014static int set_consumer_device_supply(struct regulator_dev *rdev,
1015 const char *consumer_dev_name,
1016 const char *supply)
1017{
1018 struct regulator_map *node;
1019 int has_dev;
1020
1021 if (supply == NULL)
1022 return -EINVAL;
1023
1024 if (consumer_dev_name != NULL)
1025 has_dev = 1;
1026 else
1027 has_dev = 0;
1028
1029 list_for_each_entry(node, ®ulator_map_list, list) {
1030 if (node->dev_name && consumer_dev_name) {
1031 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1032 continue;
1033 } else if (node->dev_name || consumer_dev_name) {
1034 continue;
1035 }
1036
1037 if (strcmp(node->supply, supply) != 0)
1038 continue;
1039
1040 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1041 consumer_dev_name,
1042 dev_name(&node->regulator->dev),
1043 node->regulator->desc->name,
1044 supply,
1045 dev_name(&rdev->dev), rdev_get_name(rdev));
1046 return -EBUSY;
1047 }
1048
1049 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1050 if (node == NULL)
1051 return -ENOMEM;
1052
1053 node->regulator = rdev;
1054 node->supply = supply;
1055
1056 if (has_dev) {
1057 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1058 if (node->dev_name == NULL) {
1059 kfree(node);
1060 return -ENOMEM;
1061 }
1062 }
1063
1064 list_add(&node->list, ®ulator_map_list);
1065 return 0;
1066}
1067
1068static void unset_regulator_supplies(struct regulator_dev *rdev)
1069{
1070 struct regulator_map *node, *n;
1071
1072 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1073 if (rdev == node->regulator) {
1074 list_del(&node->list);
1075 kfree(node->dev_name);
1076 kfree(node);
1077 }
1078 }
1079}
1080
1081#define REG_STR_SIZE 64
1082
1083static struct regulator *create_regulator(struct regulator_dev *rdev,
1084 struct device *dev,
1085 const char *supply_name)
1086{
1087 struct regulator *regulator;
1088 char buf[REG_STR_SIZE];
1089 int err, size;
1090
1091 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1092 if (regulator == NULL)
1093 return NULL;
1094
1095 mutex_lock(&rdev->mutex);
1096 regulator->rdev = rdev;
1097 list_add(®ulator->list, &rdev->consumer_list);
1098
1099 if (dev) {
1100 /* create a 'requested_microamps_name' sysfs entry */
1101 size = scnprintf(buf, REG_STR_SIZE,
1102 "microamps_requested_%s-%s",
1103 dev_name(dev), supply_name);
1104 if (size >= REG_STR_SIZE)
1105 goto overflow_err;
1106
1107 regulator->dev = dev;
1108 sysfs_attr_init(®ulator->dev_attr.attr);
1109 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1110 if (regulator->dev_attr.attr.name == NULL)
1111 goto attr_name_err;
1112
1113 regulator->dev_attr.attr.mode = 0444;
1114 regulator->dev_attr.show = device_requested_uA_show;
1115 err = device_create_file(dev, ®ulator->dev_attr);
1116 if (err < 0) {
1117 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
1118 goto attr_name_err;
1119 }
1120
1121 /* also add a link to the device sysfs entry */
1122 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1123 dev->kobj.name, supply_name);
1124 if (size >= REG_STR_SIZE)
1125 goto attr_err;
1126
1127 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1128 if (regulator->supply_name == NULL)
1129 goto attr_err;
1130
1131 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1132 buf);
1133 if (err) {
1134 rdev_warn(rdev, "could not add device link %s err %d\n",
1135 dev->kobj.name, err);
1136 goto link_name_err;
1137 }
1138 } else {
1139 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1140 if (regulator->supply_name == NULL)
1141 goto attr_err;
1142 }
1143
1144 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1145 rdev->debugfs);
1146 if (!regulator->debugfs) {
1147 rdev_warn(rdev, "Failed to create debugfs directory\n");
1148 } else {
1149 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1150 ®ulator->uA_load);
1151 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1152 ®ulator->min_uV);
1153 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1154 ®ulator->max_uV);
1155 }
1156
1157 /*
1158 * Check now if the regulator is an always on regulator - if
1159 * it is then we don't need to do nearly so much work for
1160 * enable/disable calls.
1161 */
1162 if (!_regulator_can_change_status(rdev) &&
1163 _regulator_is_enabled(rdev))
1164 regulator->always_on = true;
1165
1166 mutex_unlock(&rdev->mutex);
1167 return regulator;
1168link_name_err:
1169 kfree(regulator->supply_name);
1170attr_err:
1171 device_remove_file(regulator->dev, ®ulator->dev_attr);
1172attr_name_err:
1173 kfree(regulator->dev_attr.attr.name);
1174overflow_err:
1175 list_del(®ulator->list);
1176 kfree(regulator);
1177 mutex_unlock(&rdev->mutex);
1178 return NULL;
1179}
1180
1181static int _regulator_get_enable_time(struct regulator_dev *rdev)
1182{
1183 if (!rdev->desc->ops->enable_time)
1184 return 0;
1185 return rdev->desc->ops->enable_time(rdev);
1186}
1187
1188static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1189 const char *supply,
1190 int *ret)
1191{
1192 struct regulator_dev *r;
1193 struct device_node *node;
1194 struct regulator_map *map;
1195 const char *devname = NULL;
1196
1197 /* first do a dt based lookup */
1198 if (dev && dev->of_node) {
1199 node = of_get_regulator(dev, supply);
1200 if (node) {
1201 list_for_each_entry(r, ®ulator_list, list)
1202 if (r->dev.parent &&
1203 node == r->dev.of_node)
1204 return r;
1205 } else {
1206 /*
1207 * If we couldn't even get the node then it's
1208 * not just that the device didn't register
1209 * yet, there's no node and we'll never
1210 * succeed.
1211 */
1212 *ret = -ENODEV;
1213 }
1214 }
1215
1216 /* if not found, try doing it non-dt way */
1217 if (dev)
1218 devname = dev_name(dev);
1219
1220 list_for_each_entry(r, ®ulator_list, list)
1221 if (strcmp(rdev_get_name(r), supply) == 0)
1222 return r;
1223
1224 list_for_each_entry(map, ®ulator_map_list, list) {
1225 /* If the mapping has a device set up it must match */
1226 if (map->dev_name &&
1227 (!devname || strcmp(map->dev_name, devname)))
1228 continue;
1229
1230 if (strcmp(map->supply, supply) == 0)
1231 return map->regulator;
1232 }
1233
1234
1235 return NULL;
1236}
1237
1238/* Internal regulator request function */
1239static struct regulator *_regulator_get(struct device *dev, const char *id,
1240 int exclusive)
1241{
1242 struct regulator_dev *rdev;
1243 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1244 const char *devname = NULL;
1245 int ret;
1246
1247 if (id == NULL) {
1248 pr_err("get() with no identifier\n");
1249 return regulator;
1250 }
1251
1252 if (dev)
1253 devname = dev_name(dev);
1254
1255 mutex_lock(®ulator_list_mutex);
1256
1257 rdev = regulator_dev_lookup(dev, id, &ret);
1258 if (rdev)
1259 goto found;
1260
1261 if (board_wants_dummy_regulator) {
1262 rdev = dummy_regulator_rdev;
1263 goto found;
1264 }
1265
1266#ifdef CONFIG_REGULATOR_DUMMY
1267 if (!devname)
1268 devname = "deviceless";
1269
1270 /* If the board didn't flag that it was fully constrained then
1271 * substitute in a dummy regulator so consumers can continue.
1272 */
1273 if (!has_full_constraints) {
1274 pr_warn("%s supply %s not found, using dummy regulator\n",
1275 devname, id);
1276 rdev = dummy_regulator_rdev;
1277 goto found;
1278 }
1279#endif
1280
1281 mutex_unlock(®ulator_list_mutex);
1282 return regulator;
1283
1284found:
1285 if (rdev->exclusive) {
1286 regulator = ERR_PTR(-EPERM);
1287 goto out;
1288 }
1289
1290 if (exclusive && rdev->open_count) {
1291 regulator = ERR_PTR(-EBUSY);
1292 goto out;
1293 }
1294
1295 if (!try_module_get(rdev->owner))
1296 goto out;
1297
1298 regulator = create_regulator(rdev, dev, id);
1299 if (regulator == NULL) {
1300 regulator = ERR_PTR(-ENOMEM);
1301 module_put(rdev->owner);
1302 goto out;
1303 }
1304
1305 rdev->open_count++;
1306 if (exclusive) {
1307 rdev->exclusive = 1;
1308
1309 ret = _regulator_is_enabled(rdev);
1310 if (ret > 0)
1311 rdev->use_count = 1;
1312 else
1313 rdev->use_count = 0;
1314 }
1315
1316out:
1317 mutex_unlock(®ulator_list_mutex);
1318
1319 return regulator;
1320}
1321
1322/**
1323 * regulator_get - lookup and obtain a reference to a regulator.
1324 * @dev: device for regulator "consumer"
1325 * @id: Supply name or regulator ID.
1326 *
1327 * Returns a struct regulator corresponding to the regulator producer,
1328 * or IS_ERR() condition containing errno.
1329 *
1330 * Use of supply names configured via regulator_set_device_supply() is
1331 * strongly encouraged. It is recommended that the supply name used
1332 * should match the name used for the supply and/or the relevant
1333 * device pins in the datasheet.
1334 */
1335struct regulator *regulator_get(struct device *dev, const char *id)
1336{
1337 return _regulator_get(dev, id, 0);
1338}
1339EXPORT_SYMBOL_GPL(regulator_get);
1340
1341static void devm_regulator_release(struct device *dev, void *res)
1342{
1343 regulator_put(*(struct regulator **)res);
1344}
1345
1346/**
1347 * devm_regulator_get - Resource managed regulator_get()
1348 * @dev: device for regulator "consumer"
1349 * @id: Supply name or regulator ID.
1350 *
1351 * Managed regulator_get(). Regulators returned from this function are
1352 * automatically regulator_put() on driver detach. See regulator_get() for more
1353 * information.
1354 */
1355struct regulator *devm_regulator_get(struct device *dev, const char *id)
1356{
1357 struct regulator **ptr, *regulator;
1358
1359 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1360 if (!ptr)
1361 return ERR_PTR(-ENOMEM);
1362
1363 regulator = regulator_get(dev, id);
1364 if (!IS_ERR(regulator)) {
1365 *ptr = regulator;
1366 devres_add(dev, ptr);
1367 } else {
1368 devres_free(ptr);
1369 }
1370
1371 return regulator;
1372}
1373EXPORT_SYMBOL_GPL(devm_regulator_get);
1374
1375/**
1376 * regulator_get_exclusive - obtain exclusive access to a regulator.
1377 * @dev: device for regulator "consumer"
1378 * @id: Supply name or regulator ID.
1379 *
1380 * Returns a struct regulator corresponding to the regulator producer,
1381 * or IS_ERR() condition containing errno. Other consumers will be
1382 * unable to obtain this reference is held and the use count for the
1383 * regulator will be initialised to reflect the current state of the
1384 * regulator.
1385 *
1386 * This is intended for use by consumers which cannot tolerate shared
1387 * use of the regulator such as those which need to force the
1388 * regulator off for correct operation of the hardware they are
1389 * controlling.
1390 *
1391 * Use of supply names configured via regulator_set_device_supply() is
1392 * strongly encouraged. It is recommended that the supply name used
1393 * should match the name used for the supply and/or the relevant
1394 * device pins in the datasheet.
1395 */
1396struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1397{
1398 return _regulator_get(dev, id, 1);
1399}
1400EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1401
1402/**
1403 * regulator_put - "free" the regulator source
1404 * @regulator: regulator source
1405 *
1406 * Note: drivers must ensure that all regulator_enable calls made on this
1407 * regulator source are balanced by regulator_disable calls prior to calling
1408 * this function.
1409 */
1410void regulator_put(struct regulator *regulator)
1411{
1412 struct regulator_dev *rdev;
1413
1414 if (regulator == NULL || IS_ERR(regulator))
1415 return;
1416
1417 mutex_lock(®ulator_list_mutex);
1418 rdev = regulator->rdev;
1419
1420 debugfs_remove_recursive(regulator->debugfs);
1421
1422 /* remove any sysfs entries */
1423 if (regulator->dev) {
1424 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1425 device_remove_file(regulator->dev, ®ulator->dev_attr);
1426 kfree(regulator->dev_attr.attr.name);
1427 }
1428 kfree(regulator->supply_name);
1429 list_del(®ulator->list);
1430 kfree(regulator);
1431
1432 rdev->open_count--;
1433 rdev->exclusive = 0;
1434
1435 module_put(rdev->owner);
1436 mutex_unlock(®ulator_list_mutex);
1437}
1438EXPORT_SYMBOL_GPL(regulator_put);
1439
1440static int devm_regulator_match(struct device *dev, void *res, void *data)
1441{
1442 struct regulator **r = res;
1443 if (!r || !*r) {
1444 WARN_ON(!r || !*r);
1445 return 0;
1446 }
1447 return *r == data;
1448}
1449
1450/**
1451 * devm_regulator_put - Resource managed regulator_put()
1452 * @regulator: regulator to free
1453 *
1454 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1455 * this function will not need to be called and the resource management
1456 * code will ensure that the resource is freed.
1457 */
1458void devm_regulator_put(struct regulator *regulator)
1459{
1460 int rc;
1461
1462 rc = devres_destroy(regulator->dev, devm_regulator_release,
1463 devm_regulator_match, regulator);
1464 if (rc == 0)
1465 regulator_put(regulator);
1466 else
1467 WARN_ON(rc);
1468}
1469EXPORT_SYMBOL_GPL(devm_regulator_put);
1470
1471/* locks held by regulator_enable() */
1472static int _regulator_enable(struct regulator_dev *rdev)
1473{
1474 int ret, delay;
1475
1476 /* check voltage and requested load before enabling */
1477 if (rdev->constraints &&
1478 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1479 drms_uA_update(rdev);
1480
1481 if (rdev->use_count == 0) {
1482 /* The regulator may on if it's not switchable or left on */
1483 ret = _regulator_is_enabled(rdev);
1484 if (ret == -EINVAL || ret == 0) {
1485 if (!_regulator_can_change_status(rdev))
1486 return -EPERM;
1487
1488 if (!rdev->desc->ops->enable)
1489 return -EINVAL;
1490
1491 /* Query before enabling in case configuration
1492 * dependent. */
1493 ret = _regulator_get_enable_time(rdev);
1494 if (ret >= 0) {
1495 delay = ret;
1496 } else {
1497 rdev_warn(rdev, "enable_time() failed: %d\n",
1498 ret);
1499 delay = 0;
1500 }
1501
1502 trace_regulator_enable(rdev_get_name(rdev));
1503
1504 /* Allow the regulator to ramp; it would be useful
1505 * to extend this for bulk operations so that the
1506 * regulators can ramp together. */
1507 ret = rdev->desc->ops->enable(rdev);
1508 if (ret < 0)
1509 return ret;
1510
1511 trace_regulator_enable_delay(rdev_get_name(rdev));
1512
1513 if (delay >= 1000) {
1514 mdelay(delay / 1000);
1515 udelay(delay % 1000);
1516 } else if (delay) {
1517 udelay(delay);
1518 }
1519
1520 trace_regulator_enable_complete(rdev_get_name(rdev));
1521
1522 } else if (ret < 0) {
1523 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1524 return ret;
1525 }
1526 /* Fallthrough on positive return values - already enabled */
1527 }
1528
1529 rdev->use_count++;
1530
1531 return 0;
1532}
1533
1534/**
1535 * regulator_enable - enable regulator output
1536 * @regulator: regulator source
1537 *
1538 * Request that the regulator be enabled with the regulator output at
1539 * the predefined voltage or current value. Calls to regulator_enable()
1540 * must be balanced with calls to regulator_disable().
1541 *
1542 * NOTE: the output value can be set by other drivers, boot loader or may be
1543 * hardwired in the regulator.
1544 */
1545int regulator_enable(struct regulator *regulator)
1546{
1547 struct regulator_dev *rdev = regulator->rdev;
1548 int ret = 0;
1549
1550 if (regulator->always_on)
1551 return 0;
1552
1553 if (rdev->supply) {
1554 ret = regulator_enable(rdev->supply);
1555 if (ret != 0)
1556 return ret;
1557 }
1558
1559 mutex_lock(&rdev->mutex);
1560 ret = _regulator_enable(rdev);
1561 mutex_unlock(&rdev->mutex);
1562
1563 if (ret != 0 && rdev->supply)
1564 regulator_disable(rdev->supply);
1565
1566 return ret;
1567}
1568EXPORT_SYMBOL_GPL(regulator_enable);
1569
1570/* locks held by regulator_disable() */
1571static int _regulator_disable(struct regulator_dev *rdev)
1572{
1573 int ret = 0;
1574
1575 if (WARN(rdev->use_count <= 0,
1576 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1577 return -EIO;
1578
1579 /* are we the last user and permitted to disable ? */
1580 if (rdev->use_count == 1 &&
1581 (rdev->constraints && !rdev->constraints->always_on)) {
1582
1583 /* we are last user */
1584 if (_regulator_can_change_status(rdev) &&
1585 rdev->desc->ops->disable) {
1586 trace_regulator_disable(rdev_get_name(rdev));
1587
1588 ret = rdev->desc->ops->disable(rdev);
1589 if (ret < 0) {
1590 rdev_err(rdev, "failed to disable\n");
1591 return ret;
1592 }
1593
1594 trace_regulator_disable_complete(rdev_get_name(rdev));
1595
1596 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1597 NULL);
1598 }
1599
1600 rdev->use_count = 0;
1601 } else if (rdev->use_count > 1) {
1602
1603 if (rdev->constraints &&
1604 (rdev->constraints->valid_ops_mask &
1605 REGULATOR_CHANGE_DRMS))
1606 drms_uA_update(rdev);
1607
1608 rdev->use_count--;
1609 }
1610
1611 return ret;
1612}
1613
1614/**
1615 * regulator_disable - disable regulator output
1616 * @regulator: regulator source
1617 *
1618 * Disable the regulator output voltage or current. Calls to
1619 * regulator_enable() must be balanced with calls to
1620 * regulator_disable().
1621 *
1622 * NOTE: this will only disable the regulator output if no other consumer
1623 * devices have it enabled, the regulator device supports disabling and
1624 * machine constraints permit this operation.
1625 */
1626int regulator_disable(struct regulator *regulator)
1627{
1628 struct regulator_dev *rdev = regulator->rdev;
1629 int ret = 0;
1630
1631 if (regulator->always_on)
1632 return 0;
1633
1634 mutex_lock(&rdev->mutex);
1635 ret = _regulator_disable(rdev);
1636 mutex_unlock(&rdev->mutex);
1637
1638 if (ret == 0 && rdev->supply)
1639 regulator_disable(rdev->supply);
1640
1641 return ret;
1642}
1643EXPORT_SYMBOL_GPL(regulator_disable);
1644
1645/* locks held by regulator_force_disable() */
1646static int _regulator_force_disable(struct regulator_dev *rdev)
1647{
1648 int ret = 0;
1649
1650 /* force disable */
1651 if (rdev->desc->ops->disable) {
1652 /* ah well, who wants to live forever... */
1653 ret = rdev->desc->ops->disable(rdev);
1654 if (ret < 0) {
1655 rdev_err(rdev, "failed to force disable\n");
1656 return ret;
1657 }
1658 /* notify other consumers that power has been forced off */
1659 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1660 REGULATOR_EVENT_DISABLE, NULL);
1661 }
1662
1663 return ret;
1664}
1665
1666/**
1667 * regulator_force_disable - force disable regulator output
1668 * @regulator: regulator source
1669 *
1670 * Forcibly disable the regulator output voltage or current.
1671 * NOTE: this *will* disable the regulator output even if other consumer
1672 * devices have it enabled. This should be used for situations when device
1673 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1674 */
1675int regulator_force_disable(struct regulator *regulator)
1676{
1677 struct regulator_dev *rdev = regulator->rdev;
1678 int ret;
1679
1680 mutex_lock(&rdev->mutex);
1681 regulator->uA_load = 0;
1682 ret = _regulator_force_disable(regulator->rdev);
1683 mutex_unlock(&rdev->mutex);
1684
1685 if (rdev->supply)
1686 while (rdev->open_count--)
1687 regulator_disable(rdev->supply);
1688
1689 return ret;
1690}
1691EXPORT_SYMBOL_GPL(regulator_force_disable);
1692
1693static void regulator_disable_work(struct work_struct *work)
1694{
1695 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1696 disable_work.work);
1697 int count, i, ret;
1698
1699 mutex_lock(&rdev->mutex);
1700
1701 BUG_ON(!rdev->deferred_disables);
1702
1703 count = rdev->deferred_disables;
1704 rdev->deferred_disables = 0;
1705
1706 for (i = 0; i < count; i++) {
1707 ret = _regulator_disable(rdev);
1708 if (ret != 0)
1709 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1710 }
1711
1712 mutex_unlock(&rdev->mutex);
1713
1714 if (rdev->supply) {
1715 for (i = 0; i < count; i++) {
1716 ret = regulator_disable(rdev->supply);
1717 if (ret != 0) {
1718 rdev_err(rdev,
1719 "Supply disable failed: %d\n", ret);
1720 }
1721 }
1722 }
1723}
1724
1725/**
1726 * regulator_disable_deferred - disable regulator output with delay
1727 * @regulator: regulator source
1728 * @ms: miliseconds until the regulator is disabled
1729 *
1730 * Execute regulator_disable() on the regulator after a delay. This
1731 * is intended for use with devices that require some time to quiesce.
1732 *
1733 * NOTE: this will only disable the regulator output if no other consumer
1734 * devices have it enabled, the regulator device supports disabling and
1735 * machine constraints permit this operation.
1736 */
1737int regulator_disable_deferred(struct regulator *regulator, int ms)
1738{
1739 struct regulator_dev *rdev = regulator->rdev;
1740 int ret;
1741
1742 if (regulator->always_on)
1743 return 0;
1744
1745 mutex_lock(&rdev->mutex);
1746 rdev->deferred_disables++;
1747 mutex_unlock(&rdev->mutex);
1748
1749 ret = schedule_delayed_work(&rdev->disable_work,
1750 msecs_to_jiffies(ms));
1751 if (ret < 0)
1752 return ret;
1753 else
1754 return 0;
1755}
1756EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1757
1758/**
1759 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1760 *
1761 * @rdev: regulator to operate on
1762 *
1763 * Regulators that use regmap for their register I/O can set the
1764 * enable_reg and enable_mask fields in their descriptor and then use
1765 * this as their is_enabled operation, saving some code.
1766 */
1767int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1768{
1769 unsigned int val;
1770 int ret;
1771
1772 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1773 if (ret != 0)
1774 return ret;
1775
1776 return (val & rdev->desc->enable_mask) != 0;
1777}
1778EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1779
1780/**
1781 * regulator_enable_regmap - standard enable() for regmap users
1782 *
1783 * @rdev: regulator to operate on
1784 *
1785 * Regulators that use regmap for their register I/O can set the
1786 * enable_reg and enable_mask fields in their descriptor and then use
1787 * this as their enable() operation, saving some code.
1788 */
1789int regulator_enable_regmap(struct regulator_dev *rdev)
1790{
1791 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1792 rdev->desc->enable_mask,
1793 rdev->desc->enable_mask);
1794}
1795EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1796
1797/**
1798 * regulator_disable_regmap - standard disable() for regmap users
1799 *
1800 * @rdev: regulator to operate on
1801 *
1802 * Regulators that use regmap for their register I/O can set the
1803 * enable_reg and enable_mask fields in their descriptor and then use
1804 * this as their disable() operation, saving some code.
1805 */
1806int regulator_disable_regmap(struct regulator_dev *rdev)
1807{
1808 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1809 rdev->desc->enable_mask, 0);
1810}
1811EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1812
1813static int _regulator_is_enabled(struct regulator_dev *rdev)
1814{
1815 /* If we don't know then assume that the regulator is always on */
1816 if (!rdev->desc->ops->is_enabled)
1817 return 1;
1818
1819 return rdev->desc->ops->is_enabled(rdev);
1820}
1821
1822/**
1823 * regulator_is_enabled - is the regulator output enabled
1824 * @regulator: regulator source
1825 *
1826 * Returns positive if the regulator driver backing the source/client
1827 * has requested that the device be enabled, zero if it hasn't, else a
1828 * negative errno code.
1829 *
1830 * Note that the device backing this regulator handle can have multiple
1831 * users, so it might be enabled even if regulator_enable() was never
1832 * called for this particular source.
1833 */
1834int regulator_is_enabled(struct regulator *regulator)
1835{
1836 int ret;
1837
1838 if (regulator->always_on)
1839 return 1;
1840
1841 mutex_lock(®ulator->rdev->mutex);
1842 ret = _regulator_is_enabled(regulator->rdev);
1843 mutex_unlock(®ulator->rdev->mutex);
1844
1845 return ret;
1846}
1847EXPORT_SYMBOL_GPL(regulator_is_enabled);
1848
1849/**
1850 * regulator_count_voltages - count regulator_list_voltage() selectors
1851 * @regulator: regulator source
1852 *
1853 * Returns number of selectors, or negative errno. Selectors are
1854 * numbered starting at zero, and typically correspond to bitfields
1855 * in hardware registers.
1856 */
1857int regulator_count_voltages(struct regulator *regulator)
1858{
1859 struct regulator_dev *rdev = regulator->rdev;
1860
1861 return rdev->desc->n_voltages ? : -EINVAL;
1862}
1863EXPORT_SYMBOL_GPL(regulator_count_voltages);
1864
1865/**
1866 * regulator_list_voltage_linear - List voltages with simple calculation
1867 *
1868 * @rdev: Regulator device
1869 * @selector: Selector to convert into a voltage
1870 *
1871 * Regulators with a simple linear mapping between voltages and
1872 * selectors can set min_uV and uV_step in the regulator descriptor
1873 * and then use this function as their list_voltage() operation,
1874 */
1875int regulator_list_voltage_linear(struct regulator_dev *rdev,
1876 unsigned int selector)
1877{
1878 if (selector >= rdev->desc->n_voltages)
1879 return -EINVAL;
1880
1881 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
1882}
1883EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
1884
1885/**
1886 * regulator_list_voltage - enumerate supported voltages
1887 * @regulator: regulator source
1888 * @selector: identify voltage to list
1889 * Context: can sleep
1890 *
1891 * Returns a voltage that can be passed to @regulator_set_voltage(),
1892 * zero if this selector code can't be used on this system, or a
1893 * negative errno.
1894 */
1895int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1896{
1897 struct regulator_dev *rdev = regulator->rdev;
1898 struct regulator_ops *ops = rdev->desc->ops;
1899 int ret;
1900
1901 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1902 return -EINVAL;
1903
1904 mutex_lock(&rdev->mutex);
1905 ret = ops->list_voltage(rdev, selector);
1906 mutex_unlock(&rdev->mutex);
1907
1908 if (ret > 0) {
1909 if (ret < rdev->constraints->min_uV)
1910 ret = 0;
1911 else if (ret > rdev->constraints->max_uV)
1912 ret = 0;
1913 }
1914
1915 return ret;
1916}
1917EXPORT_SYMBOL_GPL(regulator_list_voltage);
1918
1919/**
1920 * regulator_is_supported_voltage - check if a voltage range can be supported
1921 *
1922 * @regulator: Regulator to check.
1923 * @min_uV: Minimum required voltage in uV.
1924 * @max_uV: Maximum required voltage in uV.
1925 *
1926 * Returns a boolean or a negative error code.
1927 */
1928int regulator_is_supported_voltage(struct regulator *regulator,
1929 int min_uV, int max_uV)
1930{
1931 int i, voltages, ret;
1932
1933 ret = regulator_count_voltages(regulator);
1934 if (ret < 0)
1935 return ret;
1936 voltages = ret;
1937
1938 for (i = 0; i < voltages; i++) {
1939 ret = regulator_list_voltage(regulator, i);
1940
1941 if (ret >= min_uV && ret <= max_uV)
1942 return 1;
1943 }
1944
1945 return 0;
1946}
1947EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
1948
1949/**
1950 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
1951 *
1952 * @rdev: regulator to operate on
1953 *
1954 * Regulators that use regmap for their register I/O can set the
1955 * vsel_reg and vsel_mask fields in their descriptor and then use this
1956 * as their get_voltage_vsel operation, saving some code.
1957 */
1958int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
1959{
1960 unsigned int val;
1961 int ret;
1962
1963 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
1964 if (ret != 0)
1965 return ret;
1966
1967 val &= rdev->desc->vsel_mask;
1968 val >>= ffs(rdev->desc->vsel_mask) - 1;
1969
1970 return val;
1971}
1972EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
1973
1974/**
1975 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
1976 *
1977 * @rdev: regulator to operate on
1978 * @sel: Selector to set
1979 *
1980 * Regulators that use regmap for their register I/O can set the
1981 * vsel_reg and vsel_mask fields in their descriptor and then use this
1982 * as their set_voltage_vsel operation, saving some code.
1983 */
1984int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
1985{
1986 sel <<= ffs(rdev->desc->vsel_mask) - 1;
1987
1988 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
1989 rdev->desc->vsel_mask, sel);
1990}
1991EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
1992
1993/**
1994 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
1995 *
1996 * @rdev: Regulator to operate on
1997 * @min_uV: Lower bound for voltage
1998 * @max_uV: Upper bound for voltage
1999 *
2000 * Drivers implementing set_voltage_sel() and list_voltage() can use
2001 * this as their map_voltage() operation. It will find a suitable
2002 * voltage by calling list_voltage() until it gets something in bounds
2003 * for the requested voltages.
2004 */
2005int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2006 int min_uV, int max_uV)
2007{
2008 int best_val = INT_MAX;
2009 int selector = 0;
2010 int i, ret;
2011
2012 /* Find the smallest voltage that falls within the specified
2013 * range.
2014 */
2015 for (i = 0; i < rdev->desc->n_voltages; i++) {
2016 ret = rdev->desc->ops->list_voltage(rdev, i);
2017 if (ret < 0)
2018 continue;
2019
2020 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2021 best_val = ret;
2022 selector = i;
2023 }
2024 }
2025
2026 if (best_val != INT_MAX)
2027 return selector;
2028 else
2029 return -EINVAL;
2030}
2031EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2032
2033/**
2034 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2035 *
2036 * @rdev: Regulator to operate on
2037 * @min_uV: Lower bound for voltage
2038 * @max_uV: Upper bound for voltage
2039 *
2040 * Drivers providing min_uV and uV_step in their regulator_desc can
2041 * use this as their map_voltage() operation.
2042 */
2043int regulator_map_voltage_linear(struct regulator_dev *rdev,
2044 int min_uV, int max_uV)
2045{
2046 int ret, voltage;
2047
2048 if (!rdev->desc->uV_step) {
2049 BUG_ON(!rdev->desc->uV_step);
2050 return -EINVAL;
2051 }
2052
2053 if (min_uV < rdev->desc->min_uV)
2054 min_uV = rdev->desc->min_uV;
2055
2056 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
2057 if (ret < 0)
2058 return ret;
2059
2060 /* Map back into a voltage to verify we're still in bounds */
2061 voltage = rdev->desc->ops->list_voltage(rdev, ret);
2062 if (voltage < min_uV || voltage > max_uV)
2063 return -EINVAL;
2064
2065 return ret;
2066}
2067EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2068
2069static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2070 int min_uV, int max_uV)
2071{
2072 int ret;
2073 int delay = 0;
2074 int best_val;
2075 unsigned int selector;
2076 int old_selector = -1;
2077
2078 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2079
2080 min_uV += rdev->constraints->uV_offset;
2081 max_uV += rdev->constraints->uV_offset;
2082
2083 /*
2084 * If we can't obtain the old selector there is not enough
2085 * info to call set_voltage_time_sel().
2086 */
2087 if (rdev->desc->ops->set_voltage_time_sel &&
2088 rdev->desc->ops->get_voltage_sel) {
2089 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2090 if (old_selector < 0)
2091 return old_selector;
2092 }
2093
2094 if (rdev->desc->ops->set_voltage) {
2095 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2096 &selector);
2097 } else if (rdev->desc->ops->set_voltage_sel) {
2098 if (rdev->desc->ops->map_voltage)
2099 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2100 max_uV);
2101 else
2102 ret = regulator_map_voltage_iterate(rdev, min_uV,
2103 max_uV);
2104
2105 if (ret >= 0) {
2106 selector = ret;
2107 ret = rdev->desc->ops->set_voltage_sel(rdev, ret);
2108 }
2109 } else {
2110 ret = -EINVAL;
2111 }
2112
2113 if (rdev->desc->ops->list_voltage)
2114 best_val = rdev->desc->ops->list_voltage(rdev, selector);
2115 else
2116 best_val = -1;
2117
2118 /* Call set_voltage_time_sel if successfully obtained old_selector */
2119 if (ret == 0 && old_selector >= 0 &&
2120 rdev->desc->ops->set_voltage_time_sel) {
2121
2122 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2123 old_selector, selector);
2124 if (delay < 0) {
2125 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2126 delay);
2127 delay = 0;
2128 }
2129 }
2130
2131 /* Insert any necessary delays */
2132 if (delay >= 1000) {
2133 mdelay(delay / 1000);
2134 udelay(delay % 1000);
2135 } else if (delay) {
2136 udelay(delay);
2137 }
2138
2139 if (ret == 0)
2140 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2141 NULL);
2142
2143 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2144
2145 return ret;
2146}
2147
2148/**
2149 * regulator_set_voltage - set regulator output voltage
2150 * @regulator: regulator source
2151 * @min_uV: Minimum required voltage in uV
2152 * @max_uV: Maximum acceptable voltage in uV
2153 *
2154 * Sets a voltage regulator to the desired output voltage. This can be set
2155 * during any regulator state. IOW, regulator can be disabled or enabled.
2156 *
2157 * If the regulator is enabled then the voltage will change to the new value
2158 * immediately otherwise if the regulator is disabled the regulator will
2159 * output at the new voltage when enabled.
2160 *
2161 * NOTE: If the regulator is shared between several devices then the lowest
2162 * request voltage that meets the system constraints will be used.
2163 * Regulator system constraints must be set for this regulator before
2164 * calling this function otherwise this call will fail.
2165 */
2166int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2167{
2168 struct regulator_dev *rdev = regulator->rdev;
2169 int ret = 0;
2170
2171 mutex_lock(&rdev->mutex);
2172
2173 /* If we're setting the same range as last time the change
2174 * should be a noop (some cpufreq implementations use the same
2175 * voltage for multiple frequencies, for example).
2176 */
2177 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2178 goto out;
2179
2180 /* sanity check */
2181 if (!rdev->desc->ops->set_voltage &&
2182 !rdev->desc->ops->set_voltage_sel) {
2183 ret = -EINVAL;
2184 goto out;
2185 }
2186
2187 /* constraints check */
2188 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2189 if (ret < 0)
2190 goto out;
2191 regulator->min_uV = min_uV;
2192 regulator->max_uV = max_uV;
2193
2194 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2195 if (ret < 0)
2196 goto out;
2197
2198 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2199
2200out:
2201 mutex_unlock(&rdev->mutex);
2202 return ret;
2203}
2204EXPORT_SYMBOL_GPL(regulator_set_voltage);
2205
2206/**
2207 * regulator_set_voltage_time - get raise/fall time
2208 * @regulator: regulator source
2209 * @old_uV: starting voltage in microvolts
2210 * @new_uV: target voltage in microvolts
2211 *
2212 * Provided with the starting and ending voltage, this function attempts to
2213 * calculate the time in microseconds required to rise or fall to this new
2214 * voltage.
2215 */
2216int regulator_set_voltage_time(struct regulator *regulator,
2217 int old_uV, int new_uV)
2218{
2219 struct regulator_dev *rdev = regulator->rdev;
2220 struct regulator_ops *ops = rdev->desc->ops;
2221 int old_sel = -1;
2222 int new_sel = -1;
2223 int voltage;
2224 int i;
2225
2226 /* Currently requires operations to do this */
2227 if (!ops->list_voltage || !ops->set_voltage_time_sel
2228 || !rdev->desc->n_voltages)
2229 return -EINVAL;
2230
2231 for (i = 0; i < rdev->desc->n_voltages; i++) {
2232 /* We only look for exact voltage matches here */
2233 voltage = regulator_list_voltage(regulator, i);
2234 if (voltage < 0)
2235 return -EINVAL;
2236 if (voltage == 0)
2237 continue;
2238 if (voltage == old_uV)
2239 old_sel = i;
2240 if (voltage == new_uV)
2241 new_sel = i;
2242 }
2243
2244 if (old_sel < 0 || new_sel < 0)
2245 return -EINVAL;
2246
2247 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2248}
2249EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2250
2251/**
2252 * regulator_sync_voltage - re-apply last regulator output voltage
2253 * @regulator: regulator source
2254 *
2255 * Re-apply the last configured voltage. This is intended to be used
2256 * where some external control source the consumer is cooperating with
2257 * has caused the configured voltage to change.
2258 */
2259int regulator_sync_voltage(struct regulator *regulator)
2260{
2261 struct regulator_dev *rdev = regulator->rdev;
2262 int ret, min_uV, max_uV;
2263
2264 mutex_lock(&rdev->mutex);
2265
2266 if (!rdev->desc->ops->set_voltage &&
2267 !rdev->desc->ops->set_voltage_sel) {
2268 ret = -EINVAL;
2269 goto out;
2270 }
2271
2272 /* This is only going to work if we've had a voltage configured. */
2273 if (!regulator->min_uV && !regulator->max_uV) {
2274 ret = -EINVAL;
2275 goto out;
2276 }
2277
2278 min_uV = regulator->min_uV;
2279 max_uV = regulator->max_uV;
2280
2281 /* This should be a paranoia check... */
2282 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2283 if (ret < 0)
2284 goto out;
2285
2286 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2287 if (ret < 0)
2288 goto out;
2289
2290 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2291
2292out:
2293 mutex_unlock(&rdev->mutex);
2294 return ret;
2295}
2296EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2297
2298static int _regulator_get_voltage(struct regulator_dev *rdev)
2299{
2300 int sel, ret;
2301
2302 if (rdev->desc->ops->get_voltage_sel) {
2303 sel = rdev->desc->ops->get_voltage_sel(rdev);
2304 if (sel < 0)
2305 return sel;
2306 ret = rdev->desc->ops->list_voltage(rdev, sel);
2307 } else if (rdev->desc->ops->get_voltage) {
2308 ret = rdev->desc->ops->get_voltage(rdev);
2309 } else {
2310 return -EINVAL;
2311 }
2312
2313 if (ret < 0)
2314 return ret;
2315 return ret - rdev->constraints->uV_offset;
2316}
2317
2318/**
2319 * regulator_get_voltage - get regulator output voltage
2320 * @regulator: regulator source
2321 *
2322 * This returns the current regulator voltage in uV.
2323 *
2324 * NOTE: If the regulator is disabled it will return the voltage value. This
2325 * function should not be used to determine regulator state.
2326 */
2327int regulator_get_voltage(struct regulator *regulator)
2328{
2329 int ret;
2330
2331 mutex_lock(®ulator->rdev->mutex);
2332
2333 ret = _regulator_get_voltage(regulator->rdev);
2334
2335 mutex_unlock(®ulator->rdev->mutex);
2336
2337 return ret;
2338}
2339EXPORT_SYMBOL_GPL(regulator_get_voltage);
2340
2341/**
2342 * regulator_set_current_limit - set regulator output current limit
2343 * @regulator: regulator source
2344 * @min_uA: Minimuum supported current in uA
2345 * @max_uA: Maximum supported current in uA
2346 *
2347 * Sets current sink to the desired output current. This can be set during
2348 * any regulator state. IOW, regulator can be disabled or enabled.
2349 *
2350 * If the regulator is enabled then the current will change to the new value
2351 * immediately otherwise if the regulator is disabled the regulator will
2352 * output at the new current when enabled.
2353 *
2354 * NOTE: Regulator system constraints must be set for this regulator before
2355 * calling this function otherwise this call will fail.
2356 */
2357int regulator_set_current_limit(struct regulator *regulator,
2358 int min_uA, int max_uA)
2359{
2360 struct regulator_dev *rdev = regulator->rdev;
2361 int ret;
2362
2363 mutex_lock(&rdev->mutex);
2364
2365 /* sanity check */
2366 if (!rdev->desc->ops->set_current_limit) {
2367 ret = -EINVAL;
2368 goto out;
2369 }
2370
2371 /* constraints check */
2372 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2373 if (ret < 0)
2374 goto out;
2375
2376 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2377out:
2378 mutex_unlock(&rdev->mutex);
2379 return ret;
2380}
2381EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2382
2383static int _regulator_get_current_limit(struct regulator_dev *rdev)
2384{
2385 int ret;
2386
2387 mutex_lock(&rdev->mutex);
2388
2389 /* sanity check */
2390 if (!rdev->desc->ops->get_current_limit) {
2391 ret = -EINVAL;
2392 goto out;
2393 }
2394
2395 ret = rdev->desc->ops->get_current_limit(rdev);
2396out:
2397 mutex_unlock(&rdev->mutex);
2398 return ret;
2399}
2400
2401/**
2402 * regulator_get_current_limit - get regulator output current
2403 * @regulator: regulator source
2404 *
2405 * This returns the current supplied by the specified current sink in uA.
2406 *
2407 * NOTE: If the regulator is disabled it will return the current value. This
2408 * function should not be used to determine regulator state.
2409 */
2410int regulator_get_current_limit(struct regulator *regulator)
2411{
2412 return _regulator_get_current_limit(regulator->rdev);
2413}
2414EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2415
2416/**
2417 * regulator_set_mode - set regulator operating mode
2418 * @regulator: regulator source
2419 * @mode: operating mode - one of the REGULATOR_MODE constants
2420 *
2421 * Set regulator operating mode to increase regulator efficiency or improve
2422 * regulation performance.
2423 *
2424 * NOTE: Regulator system constraints must be set for this regulator before
2425 * calling this function otherwise this call will fail.
2426 */
2427int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2428{
2429 struct regulator_dev *rdev = regulator->rdev;
2430 int ret;
2431 int regulator_curr_mode;
2432
2433 mutex_lock(&rdev->mutex);
2434
2435 /* sanity check */
2436 if (!rdev->desc->ops->set_mode) {
2437 ret = -EINVAL;
2438 goto out;
2439 }
2440
2441 /* return if the same mode is requested */
2442 if (rdev->desc->ops->get_mode) {
2443 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2444 if (regulator_curr_mode == mode) {
2445 ret = 0;
2446 goto out;
2447 }
2448 }
2449
2450 /* constraints check */
2451 ret = regulator_mode_constrain(rdev, &mode);
2452 if (ret < 0)
2453 goto out;
2454
2455 ret = rdev->desc->ops->set_mode(rdev, mode);
2456out:
2457 mutex_unlock(&rdev->mutex);
2458 return ret;
2459}
2460EXPORT_SYMBOL_GPL(regulator_set_mode);
2461
2462static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2463{
2464 int ret;
2465
2466 mutex_lock(&rdev->mutex);
2467
2468 /* sanity check */
2469 if (!rdev->desc->ops->get_mode) {
2470 ret = -EINVAL;
2471 goto out;
2472 }
2473
2474 ret = rdev->desc->ops->get_mode(rdev);
2475out:
2476 mutex_unlock(&rdev->mutex);
2477 return ret;
2478}
2479
2480/**
2481 * regulator_get_mode - get regulator operating mode
2482 * @regulator: regulator source
2483 *
2484 * Get the current regulator operating mode.
2485 */
2486unsigned int regulator_get_mode(struct regulator *regulator)
2487{
2488 return _regulator_get_mode(regulator->rdev);
2489}
2490EXPORT_SYMBOL_GPL(regulator_get_mode);
2491
2492/**
2493 * regulator_set_optimum_mode - set regulator optimum operating mode
2494 * @regulator: regulator source
2495 * @uA_load: load current
2496 *
2497 * Notifies the regulator core of a new device load. This is then used by
2498 * DRMS (if enabled by constraints) to set the most efficient regulator
2499 * operating mode for the new regulator loading.
2500 *
2501 * Consumer devices notify their supply regulator of the maximum power
2502 * they will require (can be taken from device datasheet in the power
2503 * consumption tables) when they change operational status and hence power
2504 * state. Examples of operational state changes that can affect power
2505 * consumption are :-
2506 *
2507 * o Device is opened / closed.
2508 * o Device I/O is about to begin or has just finished.
2509 * o Device is idling in between work.
2510 *
2511 * This information is also exported via sysfs to userspace.
2512 *
2513 * DRMS will sum the total requested load on the regulator and change
2514 * to the most efficient operating mode if platform constraints allow.
2515 *
2516 * Returns the new regulator mode or error.
2517 */
2518int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2519{
2520 struct regulator_dev *rdev = regulator->rdev;
2521 struct regulator *consumer;
2522 int ret, output_uV, input_uV = 0, total_uA_load = 0;
2523 unsigned int mode;
2524
2525 if (rdev->supply)
2526 input_uV = regulator_get_voltage(rdev->supply);
2527
2528 mutex_lock(&rdev->mutex);
2529
2530 /*
2531 * first check to see if we can set modes at all, otherwise just
2532 * tell the consumer everything is OK.
2533 */
2534 regulator->uA_load = uA_load;
2535 ret = regulator_check_drms(rdev);
2536 if (ret < 0) {
2537 ret = 0;
2538 goto out;
2539 }
2540
2541 if (!rdev->desc->ops->get_optimum_mode)
2542 goto out;
2543
2544 /*
2545 * we can actually do this so any errors are indicators of
2546 * potential real failure.
2547 */
2548 ret = -EINVAL;
2549
2550 if (!rdev->desc->ops->set_mode)
2551 goto out;
2552
2553 /* get output voltage */
2554 output_uV = _regulator_get_voltage(rdev);
2555 if (output_uV <= 0) {
2556 rdev_err(rdev, "invalid output voltage found\n");
2557 goto out;
2558 }
2559
2560 /* No supply? Use constraint voltage */
2561 if (input_uV <= 0)
2562 input_uV = rdev->constraints->input_uV;
2563 if (input_uV <= 0) {
2564 rdev_err(rdev, "invalid input voltage found\n");
2565 goto out;
2566 }
2567
2568 /* calc total requested load for this regulator */
2569 list_for_each_entry(consumer, &rdev->consumer_list, list)
2570 total_uA_load += consumer->uA_load;
2571
2572 mode = rdev->desc->ops->get_optimum_mode(rdev,
2573 input_uV, output_uV,
2574 total_uA_load);
2575 ret = regulator_mode_constrain(rdev, &mode);
2576 if (ret < 0) {
2577 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2578 total_uA_load, input_uV, output_uV);
2579 goto out;
2580 }
2581
2582 ret = rdev->desc->ops->set_mode(rdev, mode);
2583 if (ret < 0) {
2584 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2585 goto out;
2586 }
2587 ret = mode;
2588out:
2589 mutex_unlock(&rdev->mutex);
2590 return ret;
2591}
2592EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2593
2594/**
2595 * regulator_register_notifier - register regulator event notifier
2596 * @regulator: regulator source
2597 * @nb: notifier block
2598 *
2599 * Register notifier block to receive regulator events.
2600 */
2601int regulator_register_notifier(struct regulator *regulator,
2602 struct notifier_block *nb)
2603{
2604 return blocking_notifier_chain_register(®ulator->rdev->notifier,
2605 nb);
2606}
2607EXPORT_SYMBOL_GPL(regulator_register_notifier);
2608
2609/**
2610 * regulator_unregister_notifier - unregister regulator event notifier
2611 * @regulator: regulator source
2612 * @nb: notifier block
2613 *
2614 * Unregister regulator event notifier block.
2615 */
2616int regulator_unregister_notifier(struct regulator *regulator,
2617 struct notifier_block *nb)
2618{
2619 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
2620 nb);
2621}
2622EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2623
2624/* notify regulator consumers and downstream regulator consumers.
2625 * Note mutex must be held by caller.
2626 */
2627static void _notifier_call_chain(struct regulator_dev *rdev,
2628 unsigned long event, void *data)
2629{
2630 /* call rdev chain first */
2631 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
2632}
2633
2634/**
2635 * regulator_bulk_get - get multiple regulator consumers
2636 *
2637 * @dev: Device to supply
2638 * @num_consumers: Number of consumers to register
2639 * @consumers: Configuration of consumers; clients are stored here.
2640 *
2641 * @return 0 on success, an errno on failure.
2642 *
2643 * This helper function allows drivers to get several regulator
2644 * consumers in one operation. If any of the regulators cannot be
2645 * acquired then any regulators that were allocated will be freed
2646 * before returning to the caller.
2647 */
2648int regulator_bulk_get(struct device *dev, int num_consumers,
2649 struct regulator_bulk_data *consumers)
2650{
2651 int i;
2652 int ret;
2653
2654 for (i = 0; i < num_consumers; i++)
2655 consumers[i].consumer = NULL;
2656
2657 for (i = 0; i < num_consumers; i++) {
2658 consumers[i].consumer = regulator_get(dev,
2659 consumers[i].supply);
2660 if (IS_ERR(consumers[i].consumer)) {
2661 ret = PTR_ERR(consumers[i].consumer);
2662 dev_err(dev, "Failed to get supply '%s': %d\n",
2663 consumers[i].supply, ret);
2664 consumers[i].consumer = NULL;
2665 goto err;
2666 }
2667 }
2668
2669 return 0;
2670
2671err:
2672 while (--i >= 0)
2673 regulator_put(consumers[i].consumer);
2674
2675 return ret;
2676}
2677EXPORT_SYMBOL_GPL(regulator_bulk_get);
2678
2679/**
2680 * devm_regulator_bulk_get - managed get multiple regulator consumers
2681 *
2682 * @dev: Device to supply
2683 * @num_consumers: Number of consumers to register
2684 * @consumers: Configuration of consumers; clients are stored here.
2685 *
2686 * @return 0 on success, an errno on failure.
2687 *
2688 * This helper function allows drivers to get several regulator
2689 * consumers in one operation with management, the regulators will
2690 * automatically be freed when the device is unbound. If any of the
2691 * regulators cannot be acquired then any regulators that were
2692 * allocated will be freed before returning to the caller.
2693 */
2694int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2695 struct regulator_bulk_data *consumers)
2696{
2697 int i;
2698 int ret;
2699
2700 for (i = 0; i < num_consumers; i++)
2701 consumers[i].consumer = NULL;
2702
2703 for (i = 0; i < num_consumers; i++) {
2704 consumers[i].consumer = devm_regulator_get(dev,
2705 consumers[i].supply);
2706 if (IS_ERR(consumers[i].consumer)) {
2707 ret = PTR_ERR(consumers[i].consumer);
2708 dev_err(dev, "Failed to get supply '%s': %d\n",
2709 consumers[i].supply, ret);
2710 consumers[i].consumer = NULL;
2711 goto err;
2712 }
2713 }
2714
2715 return 0;
2716
2717err:
2718 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2719 devm_regulator_put(consumers[i].consumer);
2720
2721 return ret;
2722}
2723EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2724
2725static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2726{
2727 struct regulator_bulk_data *bulk = data;
2728
2729 bulk->ret = regulator_enable(bulk->consumer);
2730}
2731
2732/**
2733 * regulator_bulk_enable - enable multiple regulator consumers
2734 *
2735 * @num_consumers: Number of consumers
2736 * @consumers: Consumer data; clients are stored here.
2737 * @return 0 on success, an errno on failure
2738 *
2739 * This convenience API allows consumers to enable multiple regulator
2740 * clients in a single API call. If any consumers cannot be enabled
2741 * then any others that were enabled will be disabled again prior to
2742 * return.
2743 */
2744int regulator_bulk_enable(int num_consumers,
2745 struct regulator_bulk_data *consumers)
2746{
2747 LIST_HEAD(async_domain);
2748 int i;
2749 int ret = 0;
2750
2751 for (i = 0; i < num_consumers; i++) {
2752 if (consumers[i].consumer->always_on)
2753 consumers[i].ret = 0;
2754 else
2755 async_schedule_domain(regulator_bulk_enable_async,
2756 &consumers[i], &async_domain);
2757 }
2758
2759 async_synchronize_full_domain(&async_domain);
2760
2761 /* If any consumer failed we need to unwind any that succeeded */
2762 for (i = 0; i < num_consumers; i++) {
2763 if (consumers[i].ret != 0) {
2764 ret = consumers[i].ret;
2765 goto err;
2766 }
2767 }
2768
2769 return 0;
2770
2771err:
2772 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2773 while (--i >= 0)
2774 regulator_disable(consumers[i].consumer);
2775
2776 return ret;
2777}
2778EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2779
2780/**
2781 * regulator_bulk_disable - disable multiple regulator consumers
2782 *
2783 * @num_consumers: Number of consumers
2784 * @consumers: Consumer data; clients are stored here.
2785 * @return 0 on success, an errno on failure
2786 *
2787 * This convenience API allows consumers to disable multiple regulator
2788 * clients in a single API call. If any consumers cannot be disabled
2789 * then any others that were disabled will be enabled again prior to
2790 * return.
2791 */
2792int regulator_bulk_disable(int num_consumers,
2793 struct regulator_bulk_data *consumers)
2794{
2795 int i;
2796 int ret, r;
2797
2798 for (i = num_consumers - 1; i >= 0; --i) {
2799 ret = regulator_disable(consumers[i].consumer);
2800 if (ret != 0)
2801 goto err;
2802 }
2803
2804 return 0;
2805
2806err:
2807 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
2808 for (++i; i < num_consumers; ++i) {
2809 r = regulator_enable(consumers[i].consumer);
2810 if (r != 0)
2811 pr_err("Failed to reename %s: %d\n",
2812 consumers[i].supply, r);
2813 }
2814
2815 return ret;
2816}
2817EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2818
2819/**
2820 * regulator_bulk_force_disable - force disable multiple regulator consumers
2821 *
2822 * @num_consumers: Number of consumers
2823 * @consumers: Consumer data; clients are stored here.
2824 * @return 0 on success, an errno on failure
2825 *
2826 * This convenience API allows consumers to forcibly disable multiple regulator
2827 * clients in a single API call.
2828 * NOTE: This should be used for situations when device damage will
2829 * likely occur if the regulators are not disabled (e.g. over temp).
2830 * Although regulator_force_disable function call for some consumers can
2831 * return error numbers, the function is called for all consumers.
2832 */
2833int regulator_bulk_force_disable(int num_consumers,
2834 struct regulator_bulk_data *consumers)
2835{
2836 int i;
2837 int ret;
2838
2839 for (i = 0; i < num_consumers; i++)
2840 consumers[i].ret =
2841 regulator_force_disable(consumers[i].consumer);
2842
2843 for (i = 0; i < num_consumers; i++) {
2844 if (consumers[i].ret != 0) {
2845 ret = consumers[i].ret;
2846 goto out;
2847 }
2848 }
2849
2850 return 0;
2851out:
2852 return ret;
2853}
2854EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
2855
2856/**
2857 * regulator_bulk_free - free multiple regulator consumers
2858 *
2859 * @num_consumers: Number of consumers
2860 * @consumers: Consumer data; clients are stored here.
2861 *
2862 * This convenience API allows consumers to free multiple regulator
2863 * clients in a single API call.
2864 */
2865void regulator_bulk_free(int num_consumers,
2866 struct regulator_bulk_data *consumers)
2867{
2868 int i;
2869
2870 for (i = 0; i < num_consumers; i++) {
2871 regulator_put(consumers[i].consumer);
2872 consumers[i].consumer = NULL;
2873 }
2874}
2875EXPORT_SYMBOL_GPL(regulator_bulk_free);
2876
2877/**
2878 * regulator_notifier_call_chain - call regulator event notifier
2879 * @rdev: regulator source
2880 * @event: notifier block
2881 * @data: callback-specific data.
2882 *
2883 * Called by regulator drivers to notify clients a regulator event has
2884 * occurred. We also notify regulator clients downstream.
2885 * Note lock must be held by caller.
2886 */
2887int regulator_notifier_call_chain(struct regulator_dev *rdev,
2888 unsigned long event, void *data)
2889{
2890 _notifier_call_chain(rdev, event, data);
2891 return NOTIFY_DONE;
2892
2893}
2894EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2895
2896/**
2897 * regulator_mode_to_status - convert a regulator mode into a status
2898 *
2899 * @mode: Mode to convert
2900 *
2901 * Convert a regulator mode into a status.
2902 */
2903int regulator_mode_to_status(unsigned int mode)
2904{
2905 switch (mode) {
2906 case REGULATOR_MODE_FAST:
2907 return REGULATOR_STATUS_FAST;
2908 case REGULATOR_MODE_NORMAL:
2909 return REGULATOR_STATUS_NORMAL;
2910 case REGULATOR_MODE_IDLE:
2911 return REGULATOR_STATUS_IDLE;
2912 case REGULATOR_STATUS_STANDBY:
2913 return REGULATOR_STATUS_STANDBY;
2914 default:
2915 return 0;
2916 }
2917}
2918EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2919
2920/*
2921 * To avoid cluttering sysfs (and memory) with useless state, only
2922 * create attributes that can be meaningfully displayed.
2923 */
2924static int add_regulator_attributes(struct regulator_dev *rdev)
2925{
2926 struct device *dev = &rdev->dev;
2927 struct regulator_ops *ops = rdev->desc->ops;
2928 int status = 0;
2929
2930 /* some attributes need specific methods to be displayed */
2931 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
2932 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
2933 status = device_create_file(dev, &dev_attr_microvolts);
2934 if (status < 0)
2935 return status;
2936 }
2937 if (ops->get_current_limit) {
2938 status = device_create_file(dev, &dev_attr_microamps);
2939 if (status < 0)
2940 return status;
2941 }
2942 if (ops->get_mode) {
2943 status = device_create_file(dev, &dev_attr_opmode);
2944 if (status < 0)
2945 return status;
2946 }
2947 if (ops->is_enabled) {
2948 status = device_create_file(dev, &dev_attr_state);
2949 if (status < 0)
2950 return status;
2951 }
2952 if (ops->get_status) {
2953 status = device_create_file(dev, &dev_attr_status);
2954 if (status < 0)
2955 return status;
2956 }
2957
2958 /* some attributes are type-specific */
2959 if (rdev->desc->type == REGULATOR_CURRENT) {
2960 status = device_create_file(dev, &dev_attr_requested_microamps);
2961 if (status < 0)
2962 return status;
2963 }
2964
2965 /* all the other attributes exist to support constraints;
2966 * don't show them if there are no constraints, or if the
2967 * relevant supporting methods are missing.
2968 */
2969 if (!rdev->constraints)
2970 return status;
2971
2972 /* constraints need specific supporting methods */
2973 if (ops->set_voltage || ops->set_voltage_sel) {
2974 status = device_create_file(dev, &dev_attr_min_microvolts);
2975 if (status < 0)
2976 return status;
2977 status = device_create_file(dev, &dev_attr_max_microvolts);
2978 if (status < 0)
2979 return status;
2980 }
2981 if (ops->set_current_limit) {
2982 status = device_create_file(dev, &dev_attr_min_microamps);
2983 if (status < 0)
2984 return status;
2985 status = device_create_file(dev, &dev_attr_max_microamps);
2986 if (status < 0)
2987 return status;
2988 }
2989
2990 status = device_create_file(dev, &dev_attr_suspend_standby_state);
2991 if (status < 0)
2992 return status;
2993 status = device_create_file(dev, &dev_attr_suspend_mem_state);
2994 if (status < 0)
2995 return status;
2996 status = device_create_file(dev, &dev_attr_suspend_disk_state);
2997 if (status < 0)
2998 return status;
2999
3000 if (ops->set_suspend_voltage) {
3001 status = device_create_file(dev,
3002 &dev_attr_suspend_standby_microvolts);
3003 if (status < 0)
3004 return status;
3005 status = device_create_file(dev,
3006 &dev_attr_suspend_mem_microvolts);
3007 if (status < 0)
3008 return status;
3009 status = device_create_file(dev,
3010 &dev_attr_suspend_disk_microvolts);
3011 if (status < 0)
3012 return status;
3013 }
3014
3015 if (ops->set_suspend_mode) {
3016 status = device_create_file(dev,
3017 &dev_attr_suspend_standby_mode);
3018 if (status < 0)
3019 return status;
3020 status = device_create_file(dev,
3021 &dev_attr_suspend_mem_mode);
3022 if (status < 0)
3023 return status;
3024 status = device_create_file(dev,
3025 &dev_attr_suspend_disk_mode);
3026 if (status < 0)
3027 return status;
3028 }
3029
3030 return status;
3031}
3032
3033static void rdev_init_debugfs(struct regulator_dev *rdev)
3034{
3035 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3036 if (!rdev->debugfs) {
3037 rdev_warn(rdev, "Failed to create debugfs directory\n");
3038 return;
3039 }
3040
3041 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3042 &rdev->use_count);
3043 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3044 &rdev->open_count);
3045}
3046
3047/**
3048 * regulator_register - register regulator
3049 * @regulator_desc: regulator to register
3050 * @config: runtime configuration for regulator
3051 *
3052 * Called by regulator drivers to register a regulator.
3053 * Returns 0 on success.
3054 */
3055struct regulator_dev *
3056regulator_register(const struct regulator_desc *regulator_desc,
3057 const struct regulator_config *config)
3058{
3059 const struct regulation_constraints *constraints = NULL;
3060 const struct regulator_init_data *init_data;
3061 static atomic_t regulator_no = ATOMIC_INIT(0);
3062 struct regulator_dev *rdev;
3063 struct device *dev;
3064 int ret, i;
3065 const char *supply = NULL;
3066
3067 if (regulator_desc == NULL || config == NULL)
3068 return ERR_PTR(-EINVAL);
3069
3070 dev = config->dev;
3071 WARN_ON(!dev);
3072
3073 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3074 return ERR_PTR(-EINVAL);
3075
3076 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3077 regulator_desc->type != REGULATOR_CURRENT)
3078 return ERR_PTR(-EINVAL);
3079
3080 /* Only one of each should be implemented */
3081 WARN_ON(regulator_desc->ops->get_voltage &&
3082 regulator_desc->ops->get_voltage_sel);
3083 WARN_ON(regulator_desc->ops->set_voltage &&
3084 regulator_desc->ops->set_voltage_sel);
3085
3086 /* If we're using selectors we must implement list_voltage. */
3087 if (regulator_desc->ops->get_voltage_sel &&
3088 !regulator_desc->ops->list_voltage) {
3089 return ERR_PTR(-EINVAL);
3090 }
3091 if (regulator_desc->ops->set_voltage_sel &&
3092 !regulator_desc->ops->list_voltage) {
3093 return ERR_PTR(-EINVAL);
3094 }
3095
3096 init_data = config->init_data;
3097
3098 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3099 if (rdev == NULL)
3100 return ERR_PTR(-ENOMEM);
3101
3102 mutex_lock(®ulator_list_mutex);
3103
3104 mutex_init(&rdev->mutex);
3105 rdev->reg_data = config->driver_data;
3106 rdev->owner = regulator_desc->owner;
3107 rdev->desc = regulator_desc;
3108 rdev->regmap = config->regmap;
3109 INIT_LIST_HEAD(&rdev->consumer_list);
3110 INIT_LIST_HEAD(&rdev->list);
3111 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3112 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3113
3114 /* preform any regulator specific init */
3115 if (init_data && init_data->regulator_init) {
3116 ret = init_data->regulator_init(rdev->reg_data);
3117 if (ret < 0)
3118 goto clean;
3119 }
3120
3121 /* register with sysfs */
3122 rdev->dev.class = ®ulator_class;
3123 rdev->dev.of_node = config->of_node;
3124 rdev->dev.parent = dev;
3125 dev_set_name(&rdev->dev, "regulator.%d",
3126 atomic_inc_return(®ulator_no) - 1);
3127 ret = device_register(&rdev->dev);
3128 if (ret != 0) {
3129 put_device(&rdev->dev);
3130 goto clean;
3131 }
3132
3133 dev_set_drvdata(&rdev->dev, rdev);
3134
3135 /* set regulator constraints */
3136 if (init_data)
3137 constraints = &init_data->constraints;
3138
3139 ret = set_machine_constraints(rdev, constraints);
3140 if (ret < 0)
3141 goto scrub;
3142
3143 /* add attributes supported by this regulator */
3144 ret = add_regulator_attributes(rdev);
3145 if (ret < 0)
3146 goto scrub;
3147
3148 if (init_data && init_data->supply_regulator)
3149 supply = init_data->supply_regulator;
3150 else if (regulator_desc->supply_name)
3151 supply = regulator_desc->supply_name;
3152
3153 if (supply) {
3154 struct regulator_dev *r;
3155
3156 r = regulator_dev_lookup(dev, supply, &ret);
3157
3158 if (!r) {
3159 dev_err(dev, "Failed to find supply %s\n", supply);
3160 ret = -EPROBE_DEFER;
3161 goto scrub;
3162 }
3163
3164 ret = set_supply(rdev, r);
3165 if (ret < 0)
3166 goto scrub;
3167
3168 /* Enable supply if rail is enabled */
3169 if (_regulator_is_enabled(rdev)) {
3170 ret = regulator_enable(rdev->supply);
3171 if (ret < 0)
3172 goto scrub;
3173 }
3174 }
3175
3176 /* add consumers devices */
3177 if (init_data) {
3178 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3179 ret = set_consumer_device_supply(rdev,
3180 init_data->consumer_supplies[i].dev_name,
3181 init_data->consumer_supplies[i].supply);
3182 if (ret < 0) {
3183 dev_err(dev, "Failed to set supply %s\n",
3184 init_data->consumer_supplies[i].supply);
3185 goto unset_supplies;
3186 }
3187 }
3188 }
3189
3190 list_add(&rdev->list, ®ulator_list);
3191
3192 rdev_init_debugfs(rdev);
3193out:
3194 mutex_unlock(®ulator_list_mutex);
3195 return rdev;
3196
3197unset_supplies:
3198 unset_regulator_supplies(rdev);
3199
3200scrub:
3201 if (rdev->supply)
3202 regulator_put(rdev->supply);
3203 kfree(rdev->constraints);
3204 device_unregister(&rdev->dev);
3205 /* device core frees rdev */
3206 rdev = ERR_PTR(ret);
3207 goto out;
3208
3209clean:
3210 kfree(rdev);
3211 rdev = ERR_PTR(ret);
3212 goto out;
3213}
3214EXPORT_SYMBOL_GPL(regulator_register);
3215
3216/**
3217 * regulator_unregister - unregister regulator
3218 * @rdev: regulator to unregister
3219 *
3220 * Called by regulator drivers to unregister a regulator.
3221 */
3222void regulator_unregister(struct regulator_dev *rdev)
3223{
3224 if (rdev == NULL)
3225 return;
3226
3227 if (rdev->supply)
3228 regulator_put(rdev->supply);
3229 mutex_lock(®ulator_list_mutex);
3230 debugfs_remove_recursive(rdev->debugfs);
3231 flush_work_sync(&rdev->disable_work.work);
3232 WARN_ON(rdev->open_count);
3233 unset_regulator_supplies(rdev);
3234 list_del(&rdev->list);
3235 kfree(rdev->constraints);
3236 device_unregister(&rdev->dev);
3237 mutex_unlock(®ulator_list_mutex);
3238}
3239EXPORT_SYMBOL_GPL(regulator_unregister);
3240
3241/**
3242 * regulator_suspend_prepare - prepare regulators for system wide suspend
3243 * @state: system suspend state
3244 *
3245 * Configure each regulator with it's suspend operating parameters for state.
3246 * This will usually be called by machine suspend code prior to supending.
3247 */
3248int regulator_suspend_prepare(suspend_state_t state)
3249{
3250 struct regulator_dev *rdev;
3251 int ret = 0;
3252
3253 /* ON is handled by regulator active state */
3254 if (state == PM_SUSPEND_ON)
3255 return -EINVAL;
3256
3257 mutex_lock(®ulator_list_mutex);
3258 list_for_each_entry(rdev, ®ulator_list, list) {
3259
3260 mutex_lock(&rdev->mutex);
3261 ret = suspend_prepare(rdev, state);
3262 mutex_unlock(&rdev->mutex);
3263
3264 if (ret < 0) {
3265 rdev_err(rdev, "failed to prepare\n");
3266 goto out;
3267 }
3268 }
3269out:
3270 mutex_unlock(®ulator_list_mutex);
3271 return ret;
3272}
3273EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3274
3275/**
3276 * regulator_suspend_finish - resume regulators from system wide suspend
3277 *
3278 * Turn on regulators that might be turned off by regulator_suspend_prepare
3279 * and that should be turned on according to the regulators properties.
3280 */
3281int regulator_suspend_finish(void)
3282{
3283 struct regulator_dev *rdev;
3284 int ret = 0, error;
3285
3286 mutex_lock(®ulator_list_mutex);
3287 list_for_each_entry(rdev, ®ulator_list, list) {
3288 struct regulator_ops *ops = rdev->desc->ops;
3289
3290 mutex_lock(&rdev->mutex);
3291 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3292 ops->enable) {
3293 error = ops->enable(rdev);
3294 if (error)
3295 ret = error;
3296 } else {
3297 if (!has_full_constraints)
3298 goto unlock;
3299 if (!ops->disable)
3300 goto unlock;
3301 if (!_regulator_is_enabled(rdev))
3302 goto unlock;
3303
3304 error = ops->disable(rdev);
3305 if (error)
3306 ret = error;
3307 }
3308unlock:
3309 mutex_unlock(&rdev->mutex);
3310 }
3311 mutex_unlock(®ulator_list_mutex);
3312 return ret;
3313}
3314EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3315
3316/**
3317 * regulator_has_full_constraints - the system has fully specified constraints
3318 *
3319 * Calling this function will cause the regulator API to disable all
3320 * regulators which have a zero use count and don't have an always_on
3321 * constraint in a late_initcall.
3322 *
3323 * The intention is that this will become the default behaviour in a
3324 * future kernel release so users are encouraged to use this facility
3325 * now.
3326 */
3327void regulator_has_full_constraints(void)
3328{
3329 has_full_constraints = 1;
3330}
3331EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3332
3333/**
3334 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3335 *
3336 * Calling this function will cause the regulator API to provide a
3337 * dummy regulator to consumers if no physical regulator is found,
3338 * allowing most consumers to proceed as though a regulator were
3339 * configured. This allows systems such as those with software
3340 * controllable regulators for the CPU core only to be brought up more
3341 * readily.
3342 */
3343void regulator_use_dummy_regulator(void)
3344{
3345 board_wants_dummy_regulator = true;
3346}
3347EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3348
3349/**
3350 * rdev_get_drvdata - get rdev regulator driver data
3351 * @rdev: regulator
3352 *
3353 * Get rdev regulator driver private data. This call can be used in the
3354 * regulator driver context.
3355 */
3356void *rdev_get_drvdata(struct regulator_dev *rdev)
3357{
3358 return rdev->reg_data;
3359}
3360EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3361
3362/**
3363 * regulator_get_drvdata - get regulator driver data
3364 * @regulator: regulator
3365 *
3366 * Get regulator driver private data. This call can be used in the consumer
3367 * driver context when non API regulator specific functions need to be called.
3368 */
3369void *regulator_get_drvdata(struct regulator *regulator)
3370{
3371 return regulator->rdev->reg_data;
3372}
3373EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3374
3375/**
3376 * regulator_set_drvdata - set regulator driver data
3377 * @regulator: regulator
3378 * @data: data
3379 */
3380void regulator_set_drvdata(struct regulator *regulator, void *data)
3381{
3382 regulator->rdev->reg_data = data;
3383}
3384EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3385
3386/**
3387 * regulator_get_id - get regulator ID
3388 * @rdev: regulator
3389 */
3390int rdev_get_id(struct regulator_dev *rdev)
3391{
3392 return rdev->desc->id;
3393}
3394EXPORT_SYMBOL_GPL(rdev_get_id);
3395
3396struct device *rdev_get_dev(struct regulator_dev *rdev)
3397{
3398 return &rdev->dev;
3399}
3400EXPORT_SYMBOL_GPL(rdev_get_dev);
3401
3402void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3403{
3404 return reg_init_data->driver_data;
3405}
3406EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3407
3408#ifdef CONFIG_DEBUG_FS
3409static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3410 size_t count, loff_t *ppos)
3411{
3412 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3413 ssize_t len, ret = 0;
3414 struct regulator_map *map;
3415
3416 if (!buf)
3417 return -ENOMEM;
3418
3419 list_for_each_entry(map, ®ulator_map_list, list) {
3420 len = snprintf(buf + ret, PAGE_SIZE - ret,
3421 "%s -> %s.%s\n",
3422 rdev_get_name(map->regulator), map->dev_name,
3423 map->supply);
3424 if (len >= 0)
3425 ret += len;
3426 if (ret > PAGE_SIZE) {
3427 ret = PAGE_SIZE;
3428 break;
3429 }
3430 }
3431
3432 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3433
3434 kfree(buf);
3435
3436 return ret;
3437}
3438#endif
3439
3440static const struct file_operations supply_map_fops = {
3441#ifdef CONFIG_DEBUG_FS
3442 .read = supply_map_read_file,
3443 .llseek = default_llseek,
3444#endif
3445};
3446
3447static int __init regulator_init(void)
3448{
3449 int ret;
3450
3451 ret = class_register(®ulator_class);
3452
3453 debugfs_root = debugfs_create_dir("regulator", NULL);
3454 if (!debugfs_root)
3455 pr_warn("regulator: Failed to create debugfs directory\n");
3456
3457 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3458 &supply_map_fops);
3459
3460 regulator_dummy_init();
3461
3462 return ret;
3463}
3464
3465/* init early to allow our consumers to complete system booting */
3466core_initcall(regulator_init);
3467
3468static int __init regulator_init_complete(void)
3469{
3470 struct regulator_dev *rdev;
3471 struct regulator_ops *ops;
3472 struct regulation_constraints *c;
3473 int enabled, ret;
3474
3475 mutex_lock(®ulator_list_mutex);
3476
3477 /* If we have a full configuration then disable any regulators
3478 * which are not in use or always_on. This will become the
3479 * default behaviour in the future.
3480 */
3481 list_for_each_entry(rdev, ®ulator_list, list) {
3482 ops = rdev->desc->ops;
3483 c = rdev->constraints;
3484
3485 if (!ops->disable || (c && c->always_on))
3486 continue;
3487
3488 mutex_lock(&rdev->mutex);
3489
3490 if (rdev->use_count)
3491 goto unlock;
3492
3493 /* If we can't read the status assume it's on. */
3494 if (ops->is_enabled)
3495 enabled = ops->is_enabled(rdev);
3496 else
3497 enabled = 1;
3498
3499 if (!enabled)
3500 goto unlock;
3501
3502 if (has_full_constraints) {
3503 /* We log since this may kill the system if it
3504 * goes wrong. */
3505 rdev_info(rdev, "disabling\n");
3506 ret = ops->disable(rdev);
3507 if (ret != 0) {
3508 rdev_err(rdev, "couldn't disable: %d\n", ret);
3509 }
3510 } else {
3511 /* The intention is that in future we will
3512 * assume that full constraints are provided
3513 * so warn even if we aren't going to do
3514 * anything here.
3515 */
3516 rdev_warn(rdev, "incomplete constraints, leaving on\n");
3517 }
3518
3519unlock:
3520 mutex_unlock(&rdev->mutex);
3521 }
3522
3523 mutex_unlock(®ulator_list_mutex);
3524
3525 return 0;
3526}
3527late_initcall(regulator_init_complete);