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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#define pr_fmt(fmt) "%s: " fmt, __func__
17
18#include <linux/kernel.h>
19#include <linux/init.h>
20#include <linux/debugfs.h>
21#include <linux/device.h>
22#include <linux/slab.h>
23#include <linux/async.h>
24#include <linux/err.h>
25#include <linux/mutex.h>
26#include <linux/suspend.h>
27#include <linux/delay.h>
28#include <linux/regulator/consumer.h>
29#include <linux/regulator/driver.h>
30#include <linux/regulator/machine.h>
31
32#define CREATE_TRACE_POINTS
33#include <trace/events/regulator.h>
34
35#include "dummy.h"
36
37#define rdev_crit(rdev, fmt, ...) \
38 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
39#define rdev_err(rdev, fmt, ...) \
40 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
41#define rdev_warn(rdev, fmt, ...) \
42 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
43#define rdev_info(rdev, fmt, ...) \
44 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
45#define rdev_dbg(rdev, fmt, ...) \
46 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
47
48static DEFINE_MUTEX(regulator_list_mutex);
49static LIST_HEAD(regulator_list);
50static LIST_HEAD(regulator_map_list);
51static bool has_full_constraints;
52static bool board_wants_dummy_regulator;
53
54#ifdef CONFIG_DEBUG_FS
55static struct dentry *debugfs_root;
56#endif
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 int uA_load;
79 int min_uV;
80 int max_uV;
81 char *supply_name;
82 struct device_attribute dev_attr;
83 struct regulator_dev *rdev;
84#ifdef CONFIG_DEBUG_FS
85 struct dentry *debugfs;
86#endif
87};
88
89static int _regulator_is_enabled(struct regulator_dev *rdev);
90static int _regulator_disable(struct regulator_dev *rdev);
91static int _regulator_get_voltage(struct regulator_dev *rdev);
92static int _regulator_get_current_limit(struct regulator_dev *rdev);
93static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
94static void _notifier_call_chain(struct regulator_dev *rdev,
95 unsigned long event, void *data);
96static int _regulator_do_set_voltage(struct regulator_dev *rdev,
97 int min_uV, int max_uV);
98static struct regulator *create_regulator(struct regulator_dev *rdev,
99 struct device *dev,
100 const char *supply_name);
101
102static const char *rdev_get_name(struct regulator_dev *rdev)
103{
104 if (rdev->constraints && rdev->constraints->name)
105 return rdev->constraints->name;
106 else if (rdev->desc->name)
107 return rdev->desc->name;
108 else
109 return "";
110}
111
112/* gets the regulator for a given consumer device */
113static struct regulator *get_device_regulator(struct device *dev)
114{
115 struct regulator *regulator = NULL;
116 struct regulator_dev *rdev;
117
118 mutex_lock(®ulator_list_mutex);
119 list_for_each_entry(rdev, ®ulator_list, list) {
120 mutex_lock(&rdev->mutex);
121 list_for_each_entry(regulator, &rdev->consumer_list, list) {
122 if (regulator->dev == dev) {
123 mutex_unlock(&rdev->mutex);
124 mutex_unlock(®ulator_list_mutex);
125 return regulator;
126 }
127 }
128 mutex_unlock(&rdev->mutex);
129 }
130 mutex_unlock(®ulator_list_mutex);
131 return NULL;
132}
133
134/* Platform voltage constraint check */
135static int regulator_check_voltage(struct regulator_dev *rdev,
136 int *min_uV, int *max_uV)
137{
138 BUG_ON(*min_uV > *max_uV);
139
140 if (!rdev->constraints) {
141 rdev_err(rdev, "no constraints\n");
142 return -ENODEV;
143 }
144 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
145 rdev_err(rdev, "operation not allowed\n");
146 return -EPERM;
147 }
148
149 if (*max_uV > rdev->constraints->max_uV)
150 *max_uV = rdev->constraints->max_uV;
151 if (*min_uV < rdev->constraints->min_uV)
152 *min_uV = rdev->constraints->min_uV;
153
154 if (*min_uV > *max_uV) {
155 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
156 *min_uV, *max_uV);
157 return -EINVAL;
158 }
159
160 return 0;
161}
162
163/* Make sure we select a voltage that suits the needs of all
164 * regulator consumers
165 */
166static int regulator_check_consumers(struct regulator_dev *rdev,
167 int *min_uV, int *max_uV)
168{
169 struct regulator *regulator;
170
171 list_for_each_entry(regulator, &rdev->consumer_list, list) {
172 /*
173 * Assume consumers that didn't say anything are OK
174 * with anything in the constraint range.
175 */
176 if (!regulator->min_uV && !regulator->max_uV)
177 continue;
178
179 if (*max_uV > regulator->max_uV)
180 *max_uV = regulator->max_uV;
181 if (*min_uV < regulator->min_uV)
182 *min_uV = regulator->min_uV;
183 }
184
185 if (*min_uV > *max_uV)
186 return -EINVAL;
187
188 return 0;
189}
190
191/* current constraint check */
192static int regulator_check_current_limit(struct regulator_dev *rdev,
193 int *min_uA, int *max_uA)
194{
195 BUG_ON(*min_uA > *max_uA);
196
197 if (!rdev->constraints) {
198 rdev_err(rdev, "no constraints\n");
199 return -ENODEV;
200 }
201 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
202 rdev_err(rdev, "operation not allowed\n");
203 return -EPERM;
204 }
205
206 if (*max_uA > rdev->constraints->max_uA)
207 *max_uA = rdev->constraints->max_uA;
208 if (*min_uA < rdev->constraints->min_uA)
209 *min_uA = rdev->constraints->min_uA;
210
211 if (*min_uA > *max_uA) {
212 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
213 *min_uA, *max_uA);
214 return -EINVAL;
215 }
216
217 return 0;
218}
219
220/* operating mode constraint check */
221static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
222{
223 switch (*mode) {
224 case REGULATOR_MODE_FAST:
225 case REGULATOR_MODE_NORMAL:
226 case REGULATOR_MODE_IDLE:
227 case REGULATOR_MODE_STANDBY:
228 break;
229 default:
230 rdev_err(rdev, "invalid mode %x specified\n", *mode);
231 return -EINVAL;
232 }
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_MODE)) {
239 rdev_err(rdev, "operation not allowed\n");
240 return -EPERM;
241 }
242
243 /* The modes are bitmasks, the most power hungry modes having
244 * the lowest values. If the requested mode isn't supported
245 * try higher modes. */
246 while (*mode) {
247 if (rdev->constraints->valid_modes_mask & *mode)
248 return 0;
249 *mode /= 2;
250 }
251
252 return -EINVAL;
253}
254
255/* dynamic regulator mode switching constraint check */
256static int regulator_check_drms(struct regulator_dev *rdev)
257{
258 if (!rdev->constraints) {
259 rdev_err(rdev, "no constraints\n");
260 return -ENODEV;
261 }
262 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
263 rdev_err(rdev, "operation not allowed\n");
264 return -EPERM;
265 }
266 return 0;
267}
268
269static ssize_t device_requested_uA_show(struct device *dev,
270 struct device_attribute *attr, char *buf)
271{
272 struct regulator *regulator;
273
274 regulator = get_device_regulator(dev);
275 if (regulator == NULL)
276 return 0;
277
278 return sprintf(buf, "%d\n", regulator->uA_load);
279}
280
281static ssize_t regulator_uV_show(struct device *dev,
282 struct device_attribute *attr, char *buf)
283{
284 struct regulator_dev *rdev = dev_get_drvdata(dev);
285 ssize_t ret;
286
287 mutex_lock(&rdev->mutex);
288 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
289 mutex_unlock(&rdev->mutex);
290
291 return ret;
292}
293static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
294
295static ssize_t regulator_uA_show(struct device *dev,
296 struct device_attribute *attr, char *buf)
297{
298 struct regulator_dev *rdev = dev_get_drvdata(dev);
299
300 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
301}
302static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
303
304static ssize_t regulator_name_show(struct device *dev,
305 struct device_attribute *attr, char *buf)
306{
307 struct regulator_dev *rdev = dev_get_drvdata(dev);
308
309 return sprintf(buf, "%s\n", rdev_get_name(rdev));
310}
311
312static ssize_t regulator_print_opmode(char *buf, int mode)
313{
314 switch (mode) {
315 case REGULATOR_MODE_FAST:
316 return sprintf(buf, "fast\n");
317 case REGULATOR_MODE_NORMAL:
318 return sprintf(buf, "normal\n");
319 case REGULATOR_MODE_IDLE:
320 return sprintf(buf, "idle\n");
321 case REGULATOR_MODE_STANDBY:
322 return sprintf(buf, "standby\n");
323 }
324 return sprintf(buf, "unknown\n");
325}
326
327static ssize_t regulator_opmode_show(struct device *dev,
328 struct device_attribute *attr, char *buf)
329{
330 struct regulator_dev *rdev = dev_get_drvdata(dev);
331
332 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
333}
334static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
335
336static ssize_t regulator_print_state(char *buf, int state)
337{
338 if (state > 0)
339 return sprintf(buf, "enabled\n");
340 else if (state == 0)
341 return sprintf(buf, "disabled\n");
342 else
343 return sprintf(buf, "unknown\n");
344}
345
346static ssize_t regulator_state_show(struct device *dev,
347 struct device_attribute *attr, char *buf)
348{
349 struct regulator_dev *rdev = dev_get_drvdata(dev);
350 ssize_t ret;
351
352 mutex_lock(&rdev->mutex);
353 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
354 mutex_unlock(&rdev->mutex);
355
356 return ret;
357}
358static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
359
360static ssize_t regulator_status_show(struct device *dev,
361 struct device_attribute *attr, char *buf)
362{
363 struct regulator_dev *rdev = dev_get_drvdata(dev);
364 int status;
365 char *label;
366
367 status = rdev->desc->ops->get_status(rdev);
368 if (status < 0)
369 return status;
370
371 switch (status) {
372 case REGULATOR_STATUS_OFF:
373 label = "off";
374 break;
375 case REGULATOR_STATUS_ON:
376 label = "on";
377 break;
378 case REGULATOR_STATUS_ERROR:
379 label = "error";
380 break;
381 case REGULATOR_STATUS_FAST:
382 label = "fast";
383 break;
384 case REGULATOR_STATUS_NORMAL:
385 label = "normal";
386 break;
387 case REGULATOR_STATUS_IDLE:
388 label = "idle";
389 break;
390 case REGULATOR_STATUS_STANDBY:
391 label = "standby";
392 break;
393 default:
394 return -ERANGE;
395 }
396
397 return sprintf(buf, "%s\n", label);
398}
399static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
400
401static ssize_t regulator_min_uA_show(struct device *dev,
402 struct device_attribute *attr, char *buf)
403{
404 struct regulator_dev *rdev = dev_get_drvdata(dev);
405
406 if (!rdev->constraints)
407 return sprintf(buf, "constraint not defined\n");
408
409 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
410}
411static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
412
413static ssize_t regulator_max_uA_show(struct device *dev,
414 struct device_attribute *attr, char *buf)
415{
416 struct regulator_dev *rdev = dev_get_drvdata(dev);
417
418 if (!rdev->constraints)
419 return sprintf(buf, "constraint not defined\n");
420
421 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
422}
423static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
424
425static ssize_t regulator_min_uV_show(struct device *dev,
426 struct device_attribute *attr, char *buf)
427{
428 struct regulator_dev *rdev = dev_get_drvdata(dev);
429
430 if (!rdev->constraints)
431 return sprintf(buf, "constraint not defined\n");
432
433 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
434}
435static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
436
437static ssize_t regulator_max_uV_show(struct device *dev,
438 struct device_attribute *attr, char *buf)
439{
440 struct regulator_dev *rdev = dev_get_drvdata(dev);
441
442 if (!rdev->constraints)
443 return sprintf(buf, "constraint not defined\n");
444
445 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
446}
447static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
448
449static ssize_t regulator_total_uA_show(struct device *dev,
450 struct device_attribute *attr, char *buf)
451{
452 struct regulator_dev *rdev = dev_get_drvdata(dev);
453 struct regulator *regulator;
454 int uA = 0;
455
456 mutex_lock(&rdev->mutex);
457 list_for_each_entry(regulator, &rdev->consumer_list, list)
458 uA += regulator->uA_load;
459 mutex_unlock(&rdev->mutex);
460 return sprintf(buf, "%d\n", uA);
461}
462static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
463
464static ssize_t regulator_num_users_show(struct device *dev,
465 struct device_attribute *attr, char *buf)
466{
467 struct regulator_dev *rdev = dev_get_drvdata(dev);
468 return sprintf(buf, "%d\n", rdev->use_count);
469}
470
471static ssize_t regulator_type_show(struct device *dev,
472 struct device_attribute *attr, char *buf)
473{
474 struct regulator_dev *rdev = dev_get_drvdata(dev);
475
476 switch (rdev->desc->type) {
477 case REGULATOR_VOLTAGE:
478 return sprintf(buf, "voltage\n");
479 case REGULATOR_CURRENT:
480 return sprintf(buf, "current\n");
481 }
482 return sprintf(buf, "unknown\n");
483}
484
485static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
486 struct device_attribute *attr, char *buf)
487{
488 struct regulator_dev *rdev = dev_get_drvdata(dev);
489
490 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
491}
492static DEVICE_ATTR(suspend_mem_microvolts, 0444,
493 regulator_suspend_mem_uV_show, NULL);
494
495static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
496 struct device_attribute *attr, char *buf)
497{
498 struct regulator_dev *rdev = dev_get_drvdata(dev);
499
500 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
501}
502static DEVICE_ATTR(suspend_disk_microvolts, 0444,
503 regulator_suspend_disk_uV_show, NULL);
504
505static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
506 struct device_attribute *attr, char *buf)
507{
508 struct regulator_dev *rdev = dev_get_drvdata(dev);
509
510 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
511}
512static DEVICE_ATTR(suspend_standby_microvolts, 0444,
513 regulator_suspend_standby_uV_show, NULL);
514
515static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
516 struct device_attribute *attr, char *buf)
517{
518 struct regulator_dev *rdev = dev_get_drvdata(dev);
519
520 return regulator_print_opmode(buf,
521 rdev->constraints->state_mem.mode);
522}
523static DEVICE_ATTR(suspend_mem_mode, 0444,
524 regulator_suspend_mem_mode_show, NULL);
525
526static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
527 struct device_attribute *attr, char *buf)
528{
529 struct regulator_dev *rdev = dev_get_drvdata(dev);
530
531 return regulator_print_opmode(buf,
532 rdev->constraints->state_disk.mode);
533}
534static DEVICE_ATTR(suspend_disk_mode, 0444,
535 regulator_suspend_disk_mode_show, NULL);
536
537static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
538 struct device_attribute *attr, char *buf)
539{
540 struct regulator_dev *rdev = dev_get_drvdata(dev);
541
542 return regulator_print_opmode(buf,
543 rdev->constraints->state_standby.mode);
544}
545static DEVICE_ATTR(suspend_standby_mode, 0444,
546 regulator_suspend_standby_mode_show, NULL);
547
548static ssize_t regulator_suspend_mem_state_show(struct device *dev,
549 struct device_attribute *attr, char *buf)
550{
551 struct regulator_dev *rdev = dev_get_drvdata(dev);
552
553 return regulator_print_state(buf,
554 rdev->constraints->state_mem.enabled);
555}
556static DEVICE_ATTR(suspend_mem_state, 0444,
557 regulator_suspend_mem_state_show, NULL);
558
559static ssize_t regulator_suspend_disk_state_show(struct device *dev,
560 struct device_attribute *attr, char *buf)
561{
562 struct regulator_dev *rdev = dev_get_drvdata(dev);
563
564 return regulator_print_state(buf,
565 rdev->constraints->state_disk.enabled);
566}
567static DEVICE_ATTR(suspend_disk_state, 0444,
568 regulator_suspend_disk_state_show, NULL);
569
570static ssize_t regulator_suspend_standby_state_show(struct device *dev,
571 struct device_attribute *attr, char *buf)
572{
573 struct regulator_dev *rdev = dev_get_drvdata(dev);
574
575 return regulator_print_state(buf,
576 rdev->constraints->state_standby.enabled);
577}
578static DEVICE_ATTR(suspend_standby_state, 0444,
579 regulator_suspend_standby_state_show, NULL);
580
581
582/*
583 * These are the only attributes are present for all regulators.
584 * Other attributes are a function of regulator functionality.
585 */
586static struct device_attribute regulator_dev_attrs[] = {
587 __ATTR(name, 0444, regulator_name_show, NULL),
588 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
589 __ATTR(type, 0444, regulator_type_show, NULL),
590 __ATTR_NULL,
591};
592
593static void regulator_dev_release(struct device *dev)
594{
595 struct regulator_dev *rdev = dev_get_drvdata(dev);
596 kfree(rdev);
597}
598
599static struct class regulator_class = {
600 .name = "regulator",
601 .dev_release = regulator_dev_release,
602 .dev_attrs = regulator_dev_attrs,
603};
604
605/* Calculate the new optimum regulator operating mode based on the new total
606 * consumer load. All locks held by caller */
607static void drms_uA_update(struct regulator_dev *rdev)
608{
609 struct regulator *sibling;
610 int current_uA = 0, output_uV, input_uV, err;
611 unsigned int mode;
612
613 err = regulator_check_drms(rdev);
614 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
615 (!rdev->desc->ops->get_voltage &&
616 !rdev->desc->ops->get_voltage_sel) ||
617 !rdev->desc->ops->set_mode)
618 return;
619
620 /* get output voltage */
621 output_uV = _regulator_get_voltage(rdev);
622 if (output_uV <= 0)
623 return;
624
625 /* get input voltage */
626 input_uV = 0;
627 if (rdev->supply)
628 input_uV = _regulator_get_voltage(rdev);
629 if (input_uV <= 0)
630 input_uV = rdev->constraints->input_uV;
631 if (input_uV <= 0)
632 return;
633
634 /* calc total requested load */
635 list_for_each_entry(sibling, &rdev->consumer_list, list)
636 current_uA += sibling->uA_load;
637
638 /* now get the optimum mode for our new total regulator load */
639 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
640 output_uV, current_uA);
641
642 /* check the new mode is allowed */
643 err = regulator_mode_constrain(rdev, &mode);
644 if (err == 0)
645 rdev->desc->ops->set_mode(rdev, mode);
646}
647
648static int suspend_set_state(struct regulator_dev *rdev,
649 struct regulator_state *rstate)
650{
651 int ret = 0;
652 bool can_set_state;
653
654 can_set_state = rdev->desc->ops->set_suspend_enable &&
655 rdev->desc->ops->set_suspend_disable;
656
657 /* If we have no suspend mode configration don't set anything;
658 * only warn if the driver actually makes the suspend mode
659 * configurable.
660 */
661 if (!rstate->enabled && !rstate->disabled) {
662 if (can_set_state)
663 rdev_warn(rdev, "No configuration\n");
664 return 0;
665 }
666
667 if (rstate->enabled && rstate->disabled) {
668 rdev_err(rdev, "invalid configuration\n");
669 return -EINVAL;
670 }
671
672 if (!can_set_state) {
673 rdev_err(rdev, "no way to set suspend state\n");
674 return -EINVAL;
675 }
676
677 if (rstate->enabled)
678 ret = rdev->desc->ops->set_suspend_enable(rdev);
679 else
680 ret = rdev->desc->ops->set_suspend_disable(rdev);
681 if (ret < 0) {
682 rdev_err(rdev, "failed to enabled/disable\n");
683 return ret;
684 }
685
686 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
687 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
688 if (ret < 0) {
689 rdev_err(rdev, "failed to set voltage\n");
690 return ret;
691 }
692 }
693
694 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
695 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
696 if (ret < 0) {
697 rdev_err(rdev, "failed to set mode\n");
698 return ret;
699 }
700 }
701 return ret;
702}
703
704/* locks held by caller */
705static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
706{
707 if (!rdev->constraints)
708 return -EINVAL;
709
710 switch (state) {
711 case PM_SUSPEND_STANDBY:
712 return suspend_set_state(rdev,
713 &rdev->constraints->state_standby);
714 case PM_SUSPEND_MEM:
715 return suspend_set_state(rdev,
716 &rdev->constraints->state_mem);
717 case PM_SUSPEND_MAX:
718 return suspend_set_state(rdev,
719 &rdev->constraints->state_disk);
720 default:
721 return -EINVAL;
722 }
723}
724
725static void print_constraints(struct regulator_dev *rdev)
726{
727 struct regulation_constraints *constraints = rdev->constraints;
728 char buf[80] = "";
729 int count = 0;
730 int ret;
731
732 if (constraints->min_uV && constraints->max_uV) {
733 if (constraints->min_uV == constraints->max_uV)
734 count += sprintf(buf + count, "%d mV ",
735 constraints->min_uV / 1000);
736 else
737 count += sprintf(buf + count, "%d <--> %d mV ",
738 constraints->min_uV / 1000,
739 constraints->max_uV / 1000);
740 }
741
742 if (!constraints->min_uV ||
743 constraints->min_uV != constraints->max_uV) {
744 ret = _regulator_get_voltage(rdev);
745 if (ret > 0)
746 count += sprintf(buf + count, "at %d mV ", ret / 1000);
747 }
748
749 if (constraints->uV_offset)
750 count += sprintf(buf, "%dmV offset ",
751 constraints->uV_offset / 1000);
752
753 if (constraints->min_uA && constraints->max_uA) {
754 if (constraints->min_uA == constraints->max_uA)
755 count += sprintf(buf + count, "%d mA ",
756 constraints->min_uA / 1000);
757 else
758 count += sprintf(buf + count, "%d <--> %d mA ",
759 constraints->min_uA / 1000,
760 constraints->max_uA / 1000);
761 }
762
763 if (!constraints->min_uA ||
764 constraints->min_uA != constraints->max_uA) {
765 ret = _regulator_get_current_limit(rdev);
766 if (ret > 0)
767 count += sprintf(buf + count, "at %d mA ", ret / 1000);
768 }
769
770 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
771 count += sprintf(buf + count, "fast ");
772 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
773 count += sprintf(buf + count, "normal ");
774 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
775 count += sprintf(buf + count, "idle ");
776 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
777 count += sprintf(buf + count, "standby");
778
779 rdev_info(rdev, "%s\n", buf);
780}
781
782static int machine_constraints_voltage(struct regulator_dev *rdev,
783 struct regulation_constraints *constraints)
784{
785 struct regulator_ops *ops = rdev->desc->ops;
786 int ret;
787
788 /* do we need to apply the constraint voltage */
789 if (rdev->constraints->apply_uV &&
790 rdev->constraints->min_uV == rdev->constraints->max_uV) {
791 ret = _regulator_do_set_voltage(rdev,
792 rdev->constraints->min_uV,
793 rdev->constraints->max_uV);
794 if (ret < 0) {
795 rdev_err(rdev, "failed to apply %duV constraint\n",
796 rdev->constraints->min_uV);
797 return ret;
798 }
799 }
800
801 /* constrain machine-level voltage specs to fit
802 * the actual range supported by this regulator.
803 */
804 if (ops->list_voltage && rdev->desc->n_voltages) {
805 int count = rdev->desc->n_voltages;
806 int i;
807 int min_uV = INT_MAX;
808 int max_uV = INT_MIN;
809 int cmin = constraints->min_uV;
810 int cmax = constraints->max_uV;
811
812 /* it's safe to autoconfigure fixed-voltage supplies
813 and the constraints are used by list_voltage. */
814 if (count == 1 && !cmin) {
815 cmin = 1;
816 cmax = INT_MAX;
817 constraints->min_uV = cmin;
818 constraints->max_uV = cmax;
819 }
820
821 /* voltage constraints are optional */
822 if ((cmin == 0) && (cmax == 0))
823 return 0;
824
825 /* else require explicit machine-level constraints */
826 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
827 rdev_err(rdev, "invalid voltage constraints\n");
828 return -EINVAL;
829 }
830
831 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
832 for (i = 0; i < count; i++) {
833 int value;
834
835 value = ops->list_voltage(rdev, i);
836 if (value <= 0)
837 continue;
838
839 /* maybe adjust [min_uV..max_uV] */
840 if (value >= cmin && value < min_uV)
841 min_uV = value;
842 if (value <= cmax && value > max_uV)
843 max_uV = value;
844 }
845
846 /* final: [min_uV..max_uV] valid iff constraints valid */
847 if (max_uV < min_uV) {
848 rdev_err(rdev, "unsupportable voltage constraints\n");
849 return -EINVAL;
850 }
851
852 /* use regulator's subset of machine constraints */
853 if (constraints->min_uV < min_uV) {
854 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
855 constraints->min_uV, min_uV);
856 constraints->min_uV = min_uV;
857 }
858 if (constraints->max_uV > max_uV) {
859 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
860 constraints->max_uV, max_uV);
861 constraints->max_uV = max_uV;
862 }
863 }
864
865 return 0;
866}
867
868/**
869 * set_machine_constraints - sets regulator constraints
870 * @rdev: regulator source
871 * @constraints: constraints to apply
872 *
873 * Allows platform initialisation code to define and constrain
874 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
875 * Constraints *must* be set by platform code in order for some
876 * regulator operations to proceed i.e. set_voltage, set_current_limit,
877 * set_mode.
878 */
879static int set_machine_constraints(struct regulator_dev *rdev,
880 const struct regulation_constraints *constraints)
881{
882 int ret = 0;
883 struct regulator_ops *ops = rdev->desc->ops;
884
885 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
886 GFP_KERNEL);
887 if (!rdev->constraints)
888 return -ENOMEM;
889
890 ret = machine_constraints_voltage(rdev, rdev->constraints);
891 if (ret != 0)
892 goto out;
893
894 /* do we need to setup our suspend state */
895 if (constraints->initial_state) {
896 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
897 if (ret < 0) {
898 rdev_err(rdev, "failed to set suspend state\n");
899 goto out;
900 }
901 }
902
903 if (constraints->initial_mode) {
904 if (!ops->set_mode) {
905 rdev_err(rdev, "no set_mode operation\n");
906 ret = -EINVAL;
907 goto out;
908 }
909
910 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
911 if (ret < 0) {
912 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
913 goto out;
914 }
915 }
916
917 /* If the constraints say the regulator should be on at this point
918 * and we have control then make sure it is enabled.
919 */
920 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
921 ops->enable) {
922 ret = ops->enable(rdev);
923 if (ret < 0) {
924 rdev_err(rdev, "failed to enable\n");
925 goto out;
926 }
927 }
928
929 print_constraints(rdev);
930 return 0;
931out:
932 kfree(rdev->constraints);
933 rdev->constraints = NULL;
934 return ret;
935}
936
937/**
938 * set_supply - set regulator supply regulator
939 * @rdev: regulator name
940 * @supply_rdev: supply regulator name
941 *
942 * Called by platform initialisation code to set the supply regulator for this
943 * regulator. This ensures that a regulators supply will also be enabled by the
944 * core if it's child is enabled.
945 */
946static int set_supply(struct regulator_dev *rdev,
947 struct regulator_dev *supply_rdev)
948{
949 int err;
950
951 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
952
953 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
954 if (IS_ERR(rdev->supply)) {
955 err = PTR_ERR(rdev->supply);
956 rdev->supply = NULL;
957 return err;
958 }
959
960 return 0;
961}
962
963/**
964 * set_consumer_device_supply - Bind a regulator to a symbolic supply
965 * @rdev: regulator source
966 * @consumer_dev: device the supply applies to
967 * @consumer_dev_name: dev_name() string for device supply applies to
968 * @supply: symbolic name for supply
969 *
970 * Allows platform initialisation code to map physical regulator
971 * sources to symbolic names for supplies for use by devices. Devices
972 * should use these symbolic names to request regulators, avoiding the
973 * need to provide board-specific regulator names as platform data.
974 *
975 * Only one of consumer_dev and consumer_dev_name may be specified.
976 */
977static int set_consumer_device_supply(struct regulator_dev *rdev,
978 struct device *consumer_dev, const char *consumer_dev_name,
979 const char *supply)
980{
981 struct regulator_map *node;
982 int has_dev;
983
984 if (consumer_dev && consumer_dev_name)
985 return -EINVAL;
986
987 if (!consumer_dev_name && consumer_dev)
988 consumer_dev_name = dev_name(consumer_dev);
989
990 if (supply == NULL)
991 return -EINVAL;
992
993 if (consumer_dev_name != NULL)
994 has_dev = 1;
995 else
996 has_dev = 0;
997
998 list_for_each_entry(node, ®ulator_map_list, list) {
999 if (node->dev_name && consumer_dev_name) {
1000 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1001 continue;
1002 } else if (node->dev_name || consumer_dev_name) {
1003 continue;
1004 }
1005
1006 if (strcmp(node->supply, supply) != 0)
1007 continue;
1008
1009 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
1010 dev_name(&node->regulator->dev),
1011 node->regulator->desc->name,
1012 supply,
1013 dev_name(&rdev->dev), rdev_get_name(rdev));
1014 return -EBUSY;
1015 }
1016
1017 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1018 if (node == NULL)
1019 return -ENOMEM;
1020
1021 node->regulator = rdev;
1022 node->supply = supply;
1023
1024 if (has_dev) {
1025 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1026 if (node->dev_name == NULL) {
1027 kfree(node);
1028 return -ENOMEM;
1029 }
1030 }
1031
1032 list_add(&node->list, ®ulator_map_list);
1033 return 0;
1034}
1035
1036static void unset_regulator_supplies(struct regulator_dev *rdev)
1037{
1038 struct regulator_map *node, *n;
1039
1040 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1041 if (rdev == node->regulator) {
1042 list_del(&node->list);
1043 kfree(node->dev_name);
1044 kfree(node);
1045 }
1046 }
1047}
1048
1049#define REG_STR_SIZE 64
1050
1051static struct regulator *create_regulator(struct regulator_dev *rdev,
1052 struct device *dev,
1053 const char *supply_name)
1054{
1055 struct regulator *regulator;
1056 char buf[REG_STR_SIZE];
1057 int err, size;
1058
1059 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1060 if (regulator == NULL)
1061 return NULL;
1062
1063 mutex_lock(&rdev->mutex);
1064 regulator->rdev = rdev;
1065 list_add(®ulator->list, &rdev->consumer_list);
1066
1067 if (dev) {
1068 /* create a 'requested_microamps_name' sysfs entry */
1069 size = scnprintf(buf, REG_STR_SIZE,
1070 "microamps_requested_%s-%s",
1071 dev_name(dev), supply_name);
1072 if (size >= REG_STR_SIZE)
1073 goto overflow_err;
1074
1075 regulator->dev = dev;
1076 sysfs_attr_init(®ulator->dev_attr.attr);
1077 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1078 if (regulator->dev_attr.attr.name == NULL)
1079 goto attr_name_err;
1080
1081 regulator->dev_attr.attr.mode = 0444;
1082 regulator->dev_attr.show = device_requested_uA_show;
1083 err = device_create_file(dev, ®ulator->dev_attr);
1084 if (err < 0) {
1085 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
1086 goto attr_name_err;
1087 }
1088
1089 /* also add a link to the device sysfs entry */
1090 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1091 dev->kobj.name, supply_name);
1092 if (size >= REG_STR_SIZE)
1093 goto attr_err;
1094
1095 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1096 if (regulator->supply_name == NULL)
1097 goto attr_err;
1098
1099 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1100 buf);
1101 if (err) {
1102 rdev_warn(rdev, "could not add device link %s err %d\n",
1103 dev->kobj.name, err);
1104 goto link_name_err;
1105 }
1106 } else {
1107 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1108 if (regulator->supply_name == NULL)
1109 goto attr_err;
1110 }
1111
1112#ifdef CONFIG_DEBUG_FS
1113 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1114 rdev->debugfs);
1115 if (IS_ERR_OR_NULL(regulator->debugfs)) {
1116 rdev_warn(rdev, "Failed to create debugfs directory\n");
1117 regulator->debugfs = NULL;
1118 } else {
1119 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1120 ®ulator->uA_load);
1121 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1122 ®ulator->min_uV);
1123 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1124 ®ulator->max_uV);
1125 }
1126#endif
1127
1128 mutex_unlock(&rdev->mutex);
1129 return regulator;
1130link_name_err:
1131 kfree(regulator->supply_name);
1132attr_err:
1133 device_remove_file(regulator->dev, ®ulator->dev_attr);
1134attr_name_err:
1135 kfree(regulator->dev_attr.attr.name);
1136overflow_err:
1137 list_del(®ulator->list);
1138 kfree(regulator);
1139 mutex_unlock(&rdev->mutex);
1140 return NULL;
1141}
1142
1143static int _regulator_get_enable_time(struct regulator_dev *rdev)
1144{
1145 if (!rdev->desc->ops->enable_time)
1146 return 0;
1147 return rdev->desc->ops->enable_time(rdev);
1148}
1149
1150/* Internal regulator request function */
1151static struct regulator *_regulator_get(struct device *dev, const char *id,
1152 int exclusive)
1153{
1154 struct regulator_dev *rdev;
1155 struct regulator_map *map;
1156 struct regulator *regulator = ERR_PTR(-ENODEV);
1157 const char *devname = NULL;
1158 int ret;
1159
1160 if (id == NULL) {
1161 pr_err("get() with no identifier\n");
1162 return regulator;
1163 }
1164
1165 if (dev)
1166 devname = dev_name(dev);
1167
1168 mutex_lock(®ulator_list_mutex);
1169
1170 list_for_each_entry(map, ®ulator_map_list, list) {
1171 /* If the mapping has a device set up it must match */
1172 if (map->dev_name &&
1173 (!devname || strcmp(map->dev_name, devname)))
1174 continue;
1175
1176 if (strcmp(map->supply, id) == 0) {
1177 rdev = map->regulator;
1178 goto found;
1179 }
1180 }
1181
1182 if (board_wants_dummy_regulator) {
1183 rdev = dummy_regulator_rdev;
1184 goto found;
1185 }
1186
1187#ifdef CONFIG_REGULATOR_DUMMY
1188 if (!devname)
1189 devname = "deviceless";
1190
1191 /* If the board didn't flag that it was fully constrained then
1192 * substitute in a dummy regulator so consumers can continue.
1193 */
1194 if (!has_full_constraints) {
1195 pr_warn("%s supply %s not found, using dummy regulator\n",
1196 devname, id);
1197 rdev = dummy_regulator_rdev;
1198 goto found;
1199 }
1200#endif
1201
1202 mutex_unlock(®ulator_list_mutex);
1203 return regulator;
1204
1205found:
1206 if (rdev->exclusive) {
1207 regulator = ERR_PTR(-EPERM);
1208 goto out;
1209 }
1210
1211 if (exclusive && rdev->open_count) {
1212 regulator = ERR_PTR(-EBUSY);
1213 goto out;
1214 }
1215
1216 if (!try_module_get(rdev->owner))
1217 goto out;
1218
1219 regulator = create_regulator(rdev, dev, id);
1220 if (regulator == NULL) {
1221 regulator = ERR_PTR(-ENOMEM);
1222 module_put(rdev->owner);
1223 }
1224
1225 rdev->open_count++;
1226 if (exclusive) {
1227 rdev->exclusive = 1;
1228
1229 ret = _regulator_is_enabled(rdev);
1230 if (ret > 0)
1231 rdev->use_count = 1;
1232 else
1233 rdev->use_count = 0;
1234 }
1235
1236out:
1237 mutex_unlock(®ulator_list_mutex);
1238
1239 return regulator;
1240}
1241
1242/**
1243 * regulator_get - lookup and obtain a reference to a regulator.
1244 * @dev: device for regulator "consumer"
1245 * @id: Supply name or regulator ID.
1246 *
1247 * Returns a struct regulator corresponding to the regulator producer,
1248 * or IS_ERR() condition containing errno.
1249 *
1250 * Use of supply names configured via regulator_set_device_supply() is
1251 * strongly encouraged. It is recommended that the supply name used
1252 * should match the name used for the supply and/or the relevant
1253 * device pins in the datasheet.
1254 */
1255struct regulator *regulator_get(struct device *dev, const char *id)
1256{
1257 return _regulator_get(dev, id, 0);
1258}
1259EXPORT_SYMBOL_GPL(regulator_get);
1260
1261/**
1262 * regulator_get_exclusive - obtain exclusive access to a regulator.
1263 * @dev: device for regulator "consumer"
1264 * @id: Supply name or regulator ID.
1265 *
1266 * Returns a struct regulator corresponding to the regulator producer,
1267 * or IS_ERR() condition containing errno. Other consumers will be
1268 * unable to obtain this reference is held and the use count for the
1269 * regulator will be initialised to reflect the current state of the
1270 * regulator.
1271 *
1272 * This is intended for use by consumers which cannot tolerate shared
1273 * use of the regulator such as those which need to force the
1274 * regulator off for correct operation of the hardware they are
1275 * controlling.
1276 *
1277 * Use of supply names configured via regulator_set_device_supply() is
1278 * strongly encouraged. It is recommended that the supply name used
1279 * should match the name used for the supply and/or the relevant
1280 * device pins in the datasheet.
1281 */
1282struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1283{
1284 return _regulator_get(dev, id, 1);
1285}
1286EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1287
1288/**
1289 * regulator_put - "free" the regulator source
1290 * @regulator: regulator source
1291 *
1292 * Note: drivers must ensure that all regulator_enable calls made on this
1293 * regulator source are balanced by regulator_disable calls prior to calling
1294 * this function.
1295 */
1296void regulator_put(struct regulator *regulator)
1297{
1298 struct regulator_dev *rdev;
1299
1300 if (regulator == NULL || IS_ERR(regulator))
1301 return;
1302
1303 mutex_lock(®ulator_list_mutex);
1304 rdev = regulator->rdev;
1305
1306#ifdef CONFIG_DEBUG_FS
1307 debugfs_remove_recursive(regulator->debugfs);
1308#endif
1309
1310 /* remove any sysfs entries */
1311 if (regulator->dev) {
1312 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1313 device_remove_file(regulator->dev, ®ulator->dev_attr);
1314 kfree(regulator->dev_attr.attr.name);
1315 }
1316 kfree(regulator->supply_name);
1317 list_del(®ulator->list);
1318 kfree(regulator);
1319
1320 rdev->open_count--;
1321 rdev->exclusive = 0;
1322
1323 module_put(rdev->owner);
1324 mutex_unlock(®ulator_list_mutex);
1325}
1326EXPORT_SYMBOL_GPL(regulator_put);
1327
1328static int _regulator_can_change_status(struct regulator_dev *rdev)
1329{
1330 if (!rdev->constraints)
1331 return 0;
1332
1333 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
1334 return 1;
1335 else
1336 return 0;
1337}
1338
1339/* locks held by regulator_enable() */
1340static int _regulator_enable(struct regulator_dev *rdev)
1341{
1342 int ret, delay;
1343
1344 /* check voltage and requested load before enabling */
1345 if (rdev->constraints &&
1346 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1347 drms_uA_update(rdev);
1348
1349 if (rdev->use_count == 0) {
1350 /* The regulator may on if it's not switchable or left on */
1351 ret = _regulator_is_enabled(rdev);
1352 if (ret == -EINVAL || ret == 0) {
1353 if (!_regulator_can_change_status(rdev))
1354 return -EPERM;
1355
1356 if (!rdev->desc->ops->enable)
1357 return -EINVAL;
1358
1359 /* Query before enabling in case configuration
1360 * dependent. */
1361 ret = _regulator_get_enable_time(rdev);
1362 if (ret >= 0) {
1363 delay = ret;
1364 } else {
1365 rdev_warn(rdev, "enable_time() failed: %d\n",
1366 ret);
1367 delay = 0;
1368 }
1369
1370 trace_regulator_enable(rdev_get_name(rdev));
1371
1372 /* Allow the regulator to ramp; it would be useful
1373 * to extend this for bulk operations so that the
1374 * regulators can ramp together. */
1375 ret = rdev->desc->ops->enable(rdev);
1376 if (ret < 0)
1377 return ret;
1378
1379 trace_regulator_enable_delay(rdev_get_name(rdev));
1380
1381 if (delay >= 1000) {
1382 mdelay(delay / 1000);
1383 udelay(delay % 1000);
1384 } else if (delay) {
1385 udelay(delay);
1386 }
1387
1388 trace_regulator_enable_complete(rdev_get_name(rdev));
1389
1390 } else if (ret < 0) {
1391 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1392 return ret;
1393 }
1394 /* Fallthrough on positive return values - already enabled */
1395 }
1396
1397 rdev->use_count++;
1398
1399 return 0;
1400}
1401
1402/**
1403 * regulator_enable - enable regulator output
1404 * @regulator: regulator source
1405 *
1406 * Request that the regulator be enabled with the regulator output at
1407 * the predefined voltage or current value. Calls to regulator_enable()
1408 * must be balanced with calls to regulator_disable().
1409 *
1410 * NOTE: the output value can be set by other drivers, boot loader or may be
1411 * hardwired in the regulator.
1412 */
1413int regulator_enable(struct regulator *regulator)
1414{
1415 struct regulator_dev *rdev = regulator->rdev;
1416 int ret = 0;
1417
1418 if (rdev->supply) {
1419 ret = regulator_enable(rdev->supply);
1420 if (ret != 0)
1421 return ret;
1422 }
1423
1424 mutex_lock(&rdev->mutex);
1425 ret = _regulator_enable(rdev);
1426 mutex_unlock(&rdev->mutex);
1427
1428 if (ret != 0)
1429 regulator_disable(rdev->supply);
1430
1431 return ret;
1432}
1433EXPORT_SYMBOL_GPL(regulator_enable);
1434
1435/* locks held by regulator_disable() */
1436static int _regulator_disable(struct regulator_dev *rdev)
1437{
1438 int ret = 0;
1439
1440 if (WARN(rdev->use_count <= 0,
1441 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1442 return -EIO;
1443
1444 /* are we the last user and permitted to disable ? */
1445 if (rdev->use_count == 1 &&
1446 (rdev->constraints && !rdev->constraints->always_on)) {
1447
1448 /* we are last user */
1449 if (_regulator_can_change_status(rdev) &&
1450 rdev->desc->ops->disable) {
1451 trace_regulator_disable(rdev_get_name(rdev));
1452
1453 ret = rdev->desc->ops->disable(rdev);
1454 if (ret < 0) {
1455 rdev_err(rdev, "failed to disable\n");
1456 return ret;
1457 }
1458
1459 trace_regulator_disable_complete(rdev_get_name(rdev));
1460
1461 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1462 NULL);
1463 }
1464
1465 rdev->use_count = 0;
1466 } else if (rdev->use_count > 1) {
1467
1468 if (rdev->constraints &&
1469 (rdev->constraints->valid_ops_mask &
1470 REGULATOR_CHANGE_DRMS))
1471 drms_uA_update(rdev);
1472
1473 rdev->use_count--;
1474 }
1475
1476 return ret;
1477}
1478
1479/**
1480 * regulator_disable - disable regulator output
1481 * @regulator: regulator source
1482 *
1483 * Disable the regulator output voltage or current. Calls to
1484 * regulator_enable() must be balanced with calls to
1485 * regulator_disable().
1486 *
1487 * NOTE: this will only disable the regulator output if no other consumer
1488 * devices have it enabled, the regulator device supports disabling and
1489 * machine constraints permit this operation.
1490 */
1491int regulator_disable(struct regulator *regulator)
1492{
1493 struct regulator_dev *rdev = regulator->rdev;
1494 int ret = 0;
1495
1496 mutex_lock(&rdev->mutex);
1497 ret = _regulator_disable(rdev);
1498 mutex_unlock(&rdev->mutex);
1499
1500 if (ret == 0 && rdev->supply)
1501 regulator_disable(rdev->supply);
1502
1503 return ret;
1504}
1505EXPORT_SYMBOL_GPL(regulator_disable);
1506
1507/* locks held by regulator_force_disable() */
1508static int _regulator_force_disable(struct regulator_dev *rdev)
1509{
1510 int ret = 0;
1511
1512 /* force disable */
1513 if (rdev->desc->ops->disable) {
1514 /* ah well, who wants to live forever... */
1515 ret = rdev->desc->ops->disable(rdev);
1516 if (ret < 0) {
1517 rdev_err(rdev, "failed to force disable\n");
1518 return ret;
1519 }
1520 /* notify other consumers that power has been forced off */
1521 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1522 REGULATOR_EVENT_DISABLE, NULL);
1523 }
1524
1525 return ret;
1526}
1527
1528/**
1529 * regulator_force_disable - force disable regulator output
1530 * @regulator: regulator source
1531 *
1532 * Forcibly disable the regulator output voltage or current.
1533 * NOTE: this *will* disable the regulator output even if other consumer
1534 * devices have it enabled. This should be used for situations when device
1535 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1536 */
1537int regulator_force_disable(struct regulator *regulator)
1538{
1539 struct regulator_dev *rdev = regulator->rdev;
1540 int ret;
1541
1542 mutex_lock(&rdev->mutex);
1543 regulator->uA_load = 0;
1544 ret = _regulator_force_disable(regulator->rdev);
1545 mutex_unlock(&rdev->mutex);
1546
1547 if (rdev->supply)
1548 while (rdev->open_count--)
1549 regulator_disable(rdev->supply);
1550
1551 return ret;
1552}
1553EXPORT_SYMBOL_GPL(regulator_force_disable);
1554
1555static int _regulator_is_enabled(struct regulator_dev *rdev)
1556{
1557 /* If we don't know then assume that the regulator is always on */
1558 if (!rdev->desc->ops->is_enabled)
1559 return 1;
1560
1561 return rdev->desc->ops->is_enabled(rdev);
1562}
1563
1564/**
1565 * regulator_is_enabled - is the regulator output enabled
1566 * @regulator: regulator source
1567 *
1568 * Returns positive if the regulator driver backing the source/client
1569 * has requested that the device be enabled, zero if it hasn't, else a
1570 * negative errno code.
1571 *
1572 * Note that the device backing this regulator handle can have multiple
1573 * users, so it might be enabled even if regulator_enable() was never
1574 * called for this particular source.
1575 */
1576int regulator_is_enabled(struct regulator *regulator)
1577{
1578 int ret;
1579
1580 mutex_lock(®ulator->rdev->mutex);
1581 ret = _regulator_is_enabled(regulator->rdev);
1582 mutex_unlock(®ulator->rdev->mutex);
1583
1584 return ret;
1585}
1586EXPORT_SYMBOL_GPL(regulator_is_enabled);
1587
1588/**
1589 * regulator_count_voltages - count regulator_list_voltage() selectors
1590 * @regulator: regulator source
1591 *
1592 * Returns number of selectors, or negative errno. Selectors are
1593 * numbered starting at zero, and typically correspond to bitfields
1594 * in hardware registers.
1595 */
1596int regulator_count_voltages(struct regulator *regulator)
1597{
1598 struct regulator_dev *rdev = regulator->rdev;
1599
1600 return rdev->desc->n_voltages ? : -EINVAL;
1601}
1602EXPORT_SYMBOL_GPL(regulator_count_voltages);
1603
1604/**
1605 * regulator_list_voltage - enumerate supported voltages
1606 * @regulator: regulator source
1607 * @selector: identify voltage to list
1608 * Context: can sleep
1609 *
1610 * Returns a voltage that can be passed to @regulator_set_voltage(),
1611 * zero if this selector code can't be used on this system, or a
1612 * negative errno.
1613 */
1614int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1615{
1616 struct regulator_dev *rdev = regulator->rdev;
1617 struct regulator_ops *ops = rdev->desc->ops;
1618 int ret;
1619
1620 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1621 return -EINVAL;
1622
1623 mutex_lock(&rdev->mutex);
1624 ret = ops->list_voltage(rdev, selector);
1625 mutex_unlock(&rdev->mutex);
1626
1627 if (ret > 0) {
1628 if (ret < rdev->constraints->min_uV)
1629 ret = 0;
1630 else if (ret > rdev->constraints->max_uV)
1631 ret = 0;
1632 }
1633
1634 return ret;
1635}
1636EXPORT_SYMBOL_GPL(regulator_list_voltage);
1637
1638/**
1639 * regulator_is_supported_voltage - check if a voltage range can be supported
1640 *
1641 * @regulator: Regulator to check.
1642 * @min_uV: Minimum required voltage in uV.
1643 * @max_uV: Maximum required voltage in uV.
1644 *
1645 * Returns a boolean or a negative error code.
1646 */
1647int regulator_is_supported_voltage(struct regulator *regulator,
1648 int min_uV, int max_uV)
1649{
1650 int i, voltages, ret;
1651
1652 ret = regulator_count_voltages(regulator);
1653 if (ret < 0)
1654 return ret;
1655 voltages = ret;
1656
1657 for (i = 0; i < voltages; i++) {
1658 ret = regulator_list_voltage(regulator, i);
1659
1660 if (ret >= min_uV && ret <= max_uV)
1661 return 1;
1662 }
1663
1664 return 0;
1665}
1666
1667static int _regulator_do_set_voltage(struct regulator_dev *rdev,
1668 int min_uV, int max_uV)
1669{
1670 int ret;
1671 int delay = 0;
1672 unsigned int selector;
1673
1674 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
1675
1676 min_uV += rdev->constraints->uV_offset;
1677 max_uV += rdev->constraints->uV_offset;
1678
1679 if (rdev->desc->ops->set_voltage) {
1680 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
1681 &selector);
1682
1683 if (rdev->desc->ops->list_voltage)
1684 selector = rdev->desc->ops->list_voltage(rdev,
1685 selector);
1686 else
1687 selector = -1;
1688 } else if (rdev->desc->ops->set_voltage_sel) {
1689 int best_val = INT_MAX;
1690 int i;
1691
1692 selector = 0;
1693
1694 /* Find the smallest voltage that falls within the specified
1695 * range.
1696 */
1697 for (i = 0; i < rdev->desc->n_voltages; i++) {
1698 ret = rdev->desc->ops->list_voltage(rdev, i);
1699 if (ret < 0)
1700 continue;
1701
1702 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
1703 best_val = ret;
1704 selector = i;
1705 }
1706 }
1707
1708 /*
1709 * If we can't obtain the old selector there is not enough
1710 * info to call set_voltage_time_sel().
1711 */
1712 if (rdev->desc->ops->set_voltage_time_sel &&
1713 rdev->desc->ops->get_voltage_sel) {
1714 unsigned int old_selector = 0;
1715
1716 ret = rdev->desc->ops->get_voltage_sel(rdev);
1717 if (ret < 0)
1718 return ret;
1719 old_selector = ret;
1720 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
1721 old_selector, selector);
1722 }
1723
1724 if (best_val != INT_MAX) {
1725 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
1726 selector = best_val;
1727 } else {
1728 ret = -EINVAL;
1729 }
1730 } else {
1731 ret = -EINVAL;
1732 }
1733
1734 /* Insert any necessary delays */
1735 if (delay >= 1000) {
1736 mdelay(delay / 1000);
1737 udelay(delay % 1000);
1738 } else if (delay) {
1739 udelay(delay);
1740 }
1741
1742 if (ret == 0)
1743 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
1744 NULL);
1745
1746 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector);
1747
1748 return ret;
1749}
1750
1751/**
1752 * regulator_set_voltage - set regulator output voltage
1753 * @regulator: regulator source
1754 * @min_uV: Minimum required voltage in uV
1755 * @max_uV: Maximum acceptable voltage in uV
1756 *
1757 * Sets a voltage regulator to the desired output voltage. This can be set
1758 * during any regulator state. IOW, regulator can be disabled or enabled.
1759 *
1760 * If the regulator is enabled then the voltage will change to the new value
1761 * immediately otherwise if the regulator is disabled the regulator will
1762 * output at the new voltage when enabled.
1763 *
1764 * NOTE: If the regulator is shared between several devices then the lowest
1765 * request voltage that meets the system constraints will be used.
1766 * Regulator system constraints must be set for this regulator before
1767 * calling this function otherwise this call will fail.
1768 */
1769int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1770{
1771 struct regulator_dev *rdev = regulator->rdev;
1772 int ret = 0;
1773
1774 mutex_lock(&rdev->mutex);
1775
1776 /* If we're setting the same range as last time the change
1777 * should be a noop (some cpufreq implementations use the same
1778 * voltage for multiple frequencies, for example).
1779 */
1780 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
1781 goto out;
1782
1783 /* sanity check */
1784 if (!rdev->desc->ops->set_voltage &&
1785 !rdev->desc->ops->set_voltage_sel) {
1786 ret = -EINVAL;
1787 goto out;
1788 }
1789
1790 /* constraints check */
1791 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1792 if (ret < 0)
1793 goto out;
1794 regulator->min_uV = min_uV;
1795 regulator->max_uV = max_uV;
1796
1797 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
1798 if (ret < 0)
1799 goto out;
1800
1801 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
1802
1803out:
1804 mutex_unlock(&rdev->mutex);
1805 return ret;
1806}
1807EXPORT_SYMBOL_GPL(regulator_set_voltage);
1808
1809/**
1810 * regulator_set_voltage_time - get raise/fall time
1811 * @regulator: regulator source
1812 * @old_uV: starting voltage in microvolts
1813 * @new_uV: target voltage in microvolts
1814 *
1815 * Provided with the starting and ending voltage, this function attempts to
1816 * calculate the time in microseconds required to rise or fall to this new
1817 * voltage.
1818 */
1819int regulator_set_voltage_time(struct regulator *regulator,
1820 int old_uV, int new_uV)
1821{
1822 struct regulator_dev *rdev = regulator->rdev;
1823 struct regulator_ops *ops = rdev->desc->ops;
1824 int old_sel = -1;
1825 int new_sel = -1;
1826 int voltage;
1827 int i;
1828
1829 /* Currently requires operations to do this */
1830 if (!ops->list_voltage || !ops->set_voltage_time_sel
1831 || !rdev->desc->n_voltages)
1832 return -EINVAL;
1833
1834 for (i = 0; i < rdev->desc->n_voltages; i++) {
1835 /* We only look for exact voltage matches here */
1836 voltage = regulator_list_voltage(regulator, i);
1837 if (voltage < 0)
1838 return -EINVAL;
1839 if (voltage == 0)
1840 continue;
1841 if (voltage == old_uV)
1842 old_sel = i;
1843 if (voltage == new_uV)
1844 new_sel = i;
1845 }
1846
1847 if (old_sel < 0 || new_sel < 0)
1848 return -EINVAL;
1849
1850 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
1851}
1852EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
1853
1854/**
1855 * regulator_sync_voltage - re-apply last regulator output voltage
1856 * @regulator: regulator source
1857 *
1858 * Re-apply the last configured voltage. This is intended to be used
1859 * where some external control source the consumer is cooperating with
1860 * has caused the configured voltage to change.
1861 */
1862int regulator_sync_voltage(struct regulator *regulator)
1863{
1864 struct regulator_dev *rdev = regulator->rdev;
1865 int ret, min_uV, max_uV;
1866
1867 mutex_lock(&rdev->mutex);
1868
1869 if (!rdev->desc->ops->set_voltage &&
1870 !rdev->desc->ops->set_voltage_sel) {
1871 ret = -EINVAL;
1872 goto out;
1873 }
1874
1875 /* This is only going to work if we've had a voltage configured. */
1876 if (!regulator->min_uV && !regulator->max_uV) {
1877 ret = -EINVAL;
1878 goto out;
1879 }
1880
1881 min_uV = regulator->min_uV;
1882 max_uV = regulator->max_uV;
1883
1884 /* This should be a paranoia check... */
1885 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1886 if (ret < 0)
1887 goto out;
1888
1889 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
1890 if (ret < 0)
1891 goto out;
1892
1893 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
1894
1895out:
1896 mutex_unlock(&rdev->mutex);
1897 return ret;
1898}
1899EXPORT_SYMBOL_GPL(regulator_sync_voltage);
1900
1901static int _regulator_get_voltage(struct regulator_dev *rdev)
1902{
1903 int sel, ret;
1904
1905 if (rdev->desc->ops->get_voltage_sel) {
1906 sel = rdev->desc->ops->get_voltage_sel(rdev);
1907 if (sel < 0)
1908 return sel;
1909 ret = rdev->desc->ops->list_voltage(rdev, sel);
1910 } else if (rdev->desc->ops->get_voltage) {
1911 ret = rdev->desc->ops->get_voltage(rdev);
1912 } else {
1913 return -EINVAL;
1914 }
1915
1916 if (ret < 0)
1917 return ret;
1918 return ret - rdev->constraints->uV_offset;
1919}
1920
1921/**
1922 * regulator_get_voltage - get regulator output voltage
1923 * @regulator: regulator source
1924 *
1925 * This returns the current regulator voltage in uV.
1926 *
1927 * NOTE: If the regulator is disabled it will return the voltage value. This
1928 * function should not be used to determine regulator state.
1929 */
1930int regulator_get_voltage(struct regulator *regulator)
1931{
1932 int ret;
1933
1934 mutex_lock(®ulator->rdev->mutex);
1935
1936 ret = _regulator_get_voltage(regulator->rdev);
1937
1938 mutex_unlock(®ulator->rdev->mutex);
1939
1940 return ret;
1941}
1942EXPORT_SYMBOL_GPL(regulator_get_voltage);
1943
1944/**
1945 * regulator_set_current_limit - set regulator output current limit
1946 * @regulator: regulator source
1947 * @min_uA: Minimuum supported current in uA
1948 * @max_uA: Maximum supported current in uA
1949 *
1950 * Sets current sink to the desired output current. This can be set during
1951 * any regulator state. IOW, regulator can be disabled or enabled.
1952 *
1953 * If the regulator is enabled then the current will change to the new value
1954 * immediately otherwise if the regulator is disabled the regulator will
1955 * output at the new current when enabled.
1956 *
1957 * NOTE: Regulator system constraints must be set for this regulator before
1958 * calling this function otherwise this call will fail.
1959 */
1960int regulator_set_current_limit(struct regulator *regulator,
1961 int min_uA, int max_uA)
1962{
1963 struct regulator_dev *rdev = regulator->rdev;
1964 int ret;
1965
1966 mutex_lock(&rdev->mutex);
1967
1968 /* sanity check */
1969 if (!rdev->desc->ops->set_current_limit) {
1970 ret = -EINVAL;
1971 goto out;
1972 }
1973
1974 /* constraints check */
1975 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1976 if (ret < 0)
1977 goto out;
1978
1979 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1980out:
1981 mutex_unlock(&rdev->mutex);
1982 return ret;
1983}
1984EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1985
1986static int _regulator_get_current_limit(struct regulator_dev *rdev)
1987{
1988 int ret;
1989
1990 mutex_lock(&rdev->mutex);
1991
1992 /* sanity check */
1993 if (!rdev->desc->ops->get_current_limit) {
1994 ret = -EINVAL;
1995 goto out;
1996 }
1997
1998 ret = rdev->desc->ops->get_current_limit(rdev);
1999out:
2000 mutex_unlock(&rdev->mutex);
2001 return ret;
2002}
2003
2004/**
2005 * regulator_get_current_limit - get regulator output current
2006 * @regulator: regulator source
2007 *
2008 * This returns the current supplied by the specified current sink in uA.
2009 *
2010 * NOTE: If the regulator is disabled it will return the current value. This
2011 * function should not be used to determine regulator state.
2012 */
2013int regulator_get_current_limit(struct regulator *regulator)
2014{
2015 return _regulator_get_current_limit(regulator->rdev);
2016}
2017EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2018
2019/**
2020 * regulator_set_mode - set regulator operating mode
2021 * @regulator: regulator source
2022 * @mode: operating mode - one of the REGULATOR_MODE constants
2023 *
2024 * Set regulator operating mode to increase regulator efficiency or improve
2025 * regulation performance.
2026 *
2027 * NOTE: Regulator system constraints must be set for this regulator before
2028 * calling this function otherwise this call will fail.
2029 */
2030int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2031{
2032 struct regulator_dev *rdev = regulator->rdev;
2033 int ret;
2034 int regulator_curr_mode;
2035
2036 mutex_lock(&rdev->mutex);
2037
2038 /* sanity check */
2039 if (!rdev->desc->ops->set_mode) {
2040 ret = -EINVAL;
2041 goto out;
2042 }
2043
2044 /* return if the same mode is requested */
2045 if (rdev->desc->ops->get_mode) {
2046 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2047 if (regulator_curr_mode == mode) {
2048 ret = 0;
2049 goto out;
2050 }
2051 }
2052
2053 /* constraints check */
2054 ret = regulator_mode_constrain(rdev, &mode);
2055 if (ret < 0)
2056 goto out;
2057
2058 ret = rdev->desc->ops->set_mode(rdev, mode);
2059out:
2060 mutex_unlock(&rdev->mutex);
2061 return ret;
2062}
2063EXPORT_SYMBOL_GPL(regulator_set_mode);
2064
2065static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2066{
2067 int ret;
2068
2069 mutex_lock(&rdev->mutex);
2070
2071 /* sanity check */
2072 if (!rdev->desc->ops->get_mode) {
2073 ret = -EINVAL;
2074 goto out;
2075 }
2076
2077 ret = rdev->desc->ops->get_mode(rdev);
2078out:
2079 mutex_unlock(&rdev->mutex);
2080 return ret;
2081}
2082
2083/**
2084 * regulator_get_mode - get regulator operating mode
2085 * @regulator: regulator source
2086 *
2087 * Get the current regulator operating mode.
2088 */
2089unsigned int regulator_get_mode(struct regulator *regulator)
2090{
2091 return _regulator_get_mode(regulator->rdev);
2092}
2093EXPORT_SYMBOL_GPL(regulator_get_mode);
2094
2095/**
2096 * regulator_set_optimum_mode - set regulator optimum operating mode
2097 * @regulator: regulator source
2098 * @uA_load: load current
2099 *
2100 * Notifies the regulator core of a new device load. This is then used by
2101 * DRMS (if enabled by constraints) to set the most efficient regulator
2102 * operating mode for the new regulator loading.
2103 *
2104 * Consumer devices notify their supply regulator of the maximum power
2105 * they will require (can be taken from device datasheet in the power
2106 * consumption tables) when they change operational status and hence power
2107 * state. Examples of operational state changes that can affect power
2108 * consumption are :-
2109 *
2110 * o Device is opened / closed.
2111 * o Device I/O is about to begin or has just finished.
2112 * o Device is idling in between work.
2113 *
2114 * This information is also exported via sysfs to userspace.
2115 *
2116 * DRMS will sum the total requested load on the regulator and change
2117 * to the most efficient operating mode if platform constraints allow.
2118 *
2119 * Returns the new regulator mode or error.
2120 */
2121int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2122{
2123 struct regulator_dev *rdev = regulator->rdev;
2124 struct regulator *consumer;
2125 int ret, output_uV, input_uV, total_uA_load = 0;
2126 unsigned int mode;
2127
2128 mutex_lock(&rdev->mutex);
2129
2130 /*
2131 * first check to see if we can set modes at all, otherwise just
2132 * tell the consumer everything is OK.
2133 */
2134 regulator->uA_load = uA_load;
2135 ret = regulator_check_drms(rdev);
2136 if (ret < 0) {
2137 ret = 0;
2138 goto out;
2139 }
2140
2141 if (!rdev->desc->ops->get_optimum_mode)
2142 goto out;
2143
2144 /*
2145 * we can actually do this so any errors are indicators of
2146 * potential real failure.
2147 */
2148 ret = -EINVAL;
2149
2150 /* get output voltage */
2151 output_uV = _regulator_get_voltage(rdev);
2152 if (output_uV <= 0) {
2153 rdev_err(rdev, "invalid output voltage found\n");
2154 goto out;
2155 }
2156
2157 /* get input voltage */
2158 input_uV = 0;
2159 if (rdev->supply)
2160 input_uV = regulator_get_voltage(rdev->supply);
2161 if (input_uV <= 0)
2162 input_uV = rdev->constraints->input_uV;
2163 if (input_uV <= 0) {
2164 rdev_err(rdev, "invalid input voltage found\n");
2165 goto out;
2166 }
2167
2168 /* calc total requested load for this regulator */
2169 list_for_each_entry(consumer, &rdev->consumer_list, list)
2170 total_uA_load += consumer->uA_load;
2171
2172 mode = rdev->desc->ops->get_optimum_mode(rdev,
2173 input_uV, output_uV,
2174 total_uA_load);
2175 ret = regulator_mode_constrain(rdev, &mode);
2176 if (ret < 0) {
2177 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2178 total_uA_load, input_uV, output_uV);
2179 goto out;
2180 }
2181
2182 ret = rdev->desc->ops->set_mode(rdev, mode);
2183 if (ret < 0) {
2184 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2185 goto out;
2186 }
2187 ret = mode;
2188out:
2189 mutex_unlock(&rdev->mutex);
2190 return ret;
2191}
2192EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2193
2194/**
2195 * regulator_register_notifier - register regulator event notifier
2196 * @regulator: regulator source
2197 * @nb: notifier block
2198 *
2199 * Register notifier block to receive regulator events.
2200 */
2201int regulator_register_notifier(struct regulator *regulator,
2202 struct notifier_block *nb)
2203{
2204 return blocking_notifier_chain_register(®ulator->rdev->notifier,
2205 nb);
2206}
2207EXPORT_SYMBOL_GPL(regulator_register_notifier);
2208
2209/**
2210 * regulator_unregister_notifier - unregister regulator event notifier
2211 * @regulator: regulator source
2212 * @nb: notifier block
2213 *
2214 * Unregister regulator event notifier block.
2215 */
2216int regulator_unregister_notifier(struct regulator *regulator,
2217 struct notifier_block *nb)
2218{
2219 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
2220 nb);
2221}
2222EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2223
2224/* notify regulator consumers and downstream regulator consumers.
2225 * Note mutex must be held by caller.
2226 */
2227static void _notifier_call_chain(struct regulator_dev *rdev,
2228 unsigned long event, void *data)
2229{
2230 /* call rdev chain first */
2231 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
2232}
2233
2234/**
2235 * regulator_bulk_get - get multiple regulator consumers
2236 *
2237 * @dev: Device to supply
2238 * @num_consumers: Number of consumers to register
2239 * @consumers: Configuration of consumers; clients are stored here.
2240 *
2241 * @return 0 on success, an errno on failure.
2242 *
2243 * This helper function allows drivers to get several regulator
2244 * consumers in one operation. If any of the regulators cannot be
2245 * acquired then any regulators that were allocated will be freed
2246 * before returning to the caller.
2247 */
2248int regulator_bulk_get(struct device *dev, int num_consumers,
2249 struct regulator_bulk_data *consumers)
2250{
2251 int i;
2252 int ret;
2253
2254 for (i = 0; i < num_consumers; i++)
2255 consumers[i].consumer = NULL;
2256
2257 for (i = 0; i < num_consumers; i++) {
2258 consumers[i].consumer = regulator_get(dev,
2259 consumers[i].supply);
2260 if (IS_ERR(consumers[i].consumer)) {
2261 ret = PTR_ERR(consumers[i].consumer);
2262 dev_err(dev, "Failed to get supply '%s': %d\n",
2263 consumers[i].supply, ret);
2264 consumers[i].consumer = NULL;
2265 goto err;
2266 }
2267 }
2268
2269 return 0;
2270
2271err:
2272 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2273 regulator_put(consumers[i].consumer);
2274
2275 return ret;
2276}
2277EXPORT_SYMBOL_GPL(regulator_bulk_get);
2278
2279static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2280{
2281 struct regulator_bulk_data *bulk = data;
2282
2283 bulk->ret = regulator_enable(bulk->consumer);
2284}
2285
2286/**
2287 * regulator_bulk_enable - enable multiple regulator consumers
2288 *
2289 * @num_consumers: Number of consumers
2290 * @consumers: Consumer data; clients are stored here.
2291 * @return 0 on success, an errno on failure
2292 *
2293 * This convenience API allows consumers to enable multiple regulator
2294 * clients in a single API call. If any consumers cannot be enabled
2295 * then any others that were enabled will be disabled again prior to
2296 * return.
2297 */
2298int regulator_bulk_enable(int num_consumers,
2299 struct regulator_bulk_data *consumers)
2300{
2301 LIST_HEAD(async_domain);
2302 int i;
2303 int ret = 0;
2304
2305 for (i = 0; i < num_consumers; i++)
2306 async_schedule_domain(regulator_bulk_enable_async,
2307 &consumers[i], &async_domain);
2308
2309 async_synchronize_full_domain(&async_domain);
2310
2311 /* If any consumer failed we need to unwind any that succeeded */
2312 for (i = 0; i < num_consumers; i++) {
2313 if (consumers[i].ret != 0) {
2314 ret = consumers[i].ret;
2315 goto err;
2316 }
2317 }
2318
2319 return 0;
2320
2321err:
2322 for (i = 0; i < num_consumers; i++)
2323 if (consumers[i].ret == 0)
2324 regulator_disable(consumers[i].consumer);
2325 else
2326 pr_err("Failed to enable %s: %d\n",
2327 consumers[i].supply, consumers[i].ret);
2328
2329 return ret;
2330}
2331EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2332
2333/**
2334 * regulator_bulk_disable - disable multiple regulator consumers
2335 *
2336 * @num_consumers: Number of consumers
2337 * @consumers: Consumer data; clients are stored here.
2338 * @return 0 on success, an errno on failure
2339 *
2340 * This convenience API allows consumers to disable multiple regulator
2341 * clients in a single API call. If any consumers cannot be enabled
2342 * then any others that were disabled will be disabled again prior to
2343 * return.
2344 */
2345int regulator_bulk_disable(int num_consumers,
2346 struct regulator_bulk_data *consumers)
2347{
2348 int i;
2349 int ret;
2350
2351 for (i = 0; i < num_consumers; i++) {
2352 ret = regulator_disable(consumers[i].consumer);
2353 if (ret != 0)
2354 goto err;
2355 }
2356
2357 return 0;
2358
2359err:
2360 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
2361 for (--i; i >= 0; --i)
2362 regulator_enable(consumers[i].consumer);
2363
2364 return ret;
2365}
2366EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2367
2368/**
2369 * regulator_bulk_free - free multiple regulator consumers
2370 *
2371 * @num_consumers: Number of consumers
2372 * @consumers: Consumer data; clients are stored here.
2373 *
2374 * This convenience API allows consumers to free multiple regulator
2375 * clients in a single API call.
2376 */
2377void regulator_bulk_free(int num_consumers,
2378 struct regulator_bulk_data *consumers)
2379{
2380 int i;
2381
2382 for (i = 0; i < num_consumers; i++) {
2383 regulator_put(consumers[i].consumer);
2384 consumers[i].consumer = NULL;
2385 }
2386}
2387EXPORT_SYMBOL_GPL(regulator_bulk_free);
2388
2389/**
2390 * regulator_notifier_call_chain - call regulator event notifier
2391 * @rdev: regulator source
2392 * @event: notifier block
2393 * @data: callback-specific data.
2394 *
2395 * Called by regulator drivers to notify clients a regulator event has
2396 * occurred. We also notify regulator clients downstream.
2397 * Note lock must be held by caller.
2398 */
2399int regulator_notifier_call_chain(struct regulator_dev *rdev,
2400 unsigned long event, void *data)
2401{
2402 _notifier_call_chain(rdev, event, data);
2403 return NOTIFY_DONE;
2404
2405}
2406EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2407
2408/**
2409 * regulator_mode_to_status - convert a regulator mode into a status
2410 *
2411 * @mode: Mode to convert
2412 *
2413 * Convert a regulator mode into a status.
2414 */
2415int regulator_mode_to_status(unsigned int mode)
2416{
2417 switch (mode) {
2418 case REGULATOR_MODE_FAST:
2419 return REGULATOR_STATUS_FAST;
2420 case REGULATOR_MODE_NORMAL:
2421 return REGULATOR_STATUS_NORMAL;
2422 case REGULATOR_MODE_IDLE:
2423 return REGULATOR_STATUS_IDLE;
2424 case REGULATOR_STATUS_STANDBY:
2425 return REGULATOR_STATUS_STANDBY;
2426 default:
2427 return 0;
2428 }
2429}
2430EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2431
2432/*
2433 * To avoid cluttering sysfs (and memory) with useless state, only
2434 * create attributes that can be meaningfully displayed.
2435 */
2436static int add_regulator_attributes(struct regulator_dev *rdev)
2437{
2438 struct device *dev = &rdev->dev;
2439 struct regulator_ops *ops = rdev->desc->ops;
2440 int status = 0;
2441
2442 /* some attributes need specific methods to be displayed */
2443 if (ops->get_voltage || ops->get_voltage_sel) {
2444 status = device_create_file(dev, &dev_attr_microvolts);
2445 if (status < 0)
2446 return status;
2447 }
2448 if (ops->get_current_limit) {
2449 status = device_create_file(dev, &dev_attr_microamps);
2450 if (status < 0)
2451 return status;
2452 }
2453 if (ops->get_mode) {
2454 status = device_create_file(dev, &dev_attr_opmode);
2455 if (status < 0)
2456 return status;
2457 }
2458 if (ops->is_enabled) {
2459 status = device_create_file(dev, &dev_attr_state);
2460 if (status < 0)
2461 return status;
2462 }
2463 if (ops->get_status) {
2464 status = device_create_file(dev, &dev_attr_status);
2465 if (status < 0)
2466 return status;
2467 }
2468
2469 /* some attributes are type-specific */
2470 if (rdev->desc->type == REGULATOR_CURRENT) {
2471 status = device_create_file(dev, &dev_attr_requested_microamps);
2472 if (status < 0)
2473 return status;
2474 }
2475
2476 /* all the other attributes exist to support constraints;
2477 * don't show them if there are no constraints, or if the
2478 * relevant supporting methods are missing.
2479 */
2480 if (!rdev->constraints)
2481 return status;
2482
2483 /* constraints need specific supporting methods */
2484 if (ops->set_voltage || ops->set_voltage_sel) {
2485 status = device_create_file(dev, &dev_attr_min_microvolts);
2486 if (status < 0)
2487 return status;
2488 status = device_create_file(dev, &dev_attr_max_microvolts);
2489 if (status < 0)
2490 return status;
2491 }
2492 if (ops->set_current_limit) {
2493 status = device_create_file(dev, &dev_attr_min_microamps);
2494 if (status < 0)
2495 return status;
2496 status = device_create_file(dev, &dev_attr_max_microamps);
2497 if (status < 0)
2498 return status;
2499 }
2500
2501 /* suspend mode constraints need multiple supporting methods */
2502 if (!(ops->set_suspend_enable && ops->set_suspend_disable))
2503 return status;
2504
2505 status = device_create_file(dev, &dev_attr_suspend_standby_state);
2506 if (status < 0)
2507 return status;
2508 status = device_create_file(dev, &dev_attr_suspend_mem_state);
2509 if (status < 0)
2510 return status;
2511 status = device_create_file(dev, &dev_attr_suspend_disk_state);
2512 if (status < 0)
2513 return status;
2514
2515 if (ops->set_suspend_voltage) {
2516 status = device_create_file(dev,
2517 &dev_attr_suspend_standby_microvolts);
2518 if (status < 0)
2519 return status;
2520 status = device_create_file(dev,
2521 &dev_attr_suspend_mem_microvolts);
2522 if (status < 0)
2523 return status;
2524 status = device_create_file(dev,
2525 &dev_attr_suspend_disk_microvolts);
2526 if (status < 0)
2527 return status;
2528 }
2529
2530 if (ops->set_suspend_mode) {
2531 status = device_create_file(dev,
2532 &dev_attr_suspend_standby_mode);
2533 if (status < 0)
2534 return status;
2535 status = device_create_file(dev,
2536 &dev_attr_suspend_mem_mode);
2537 if (status < 0)
2538 return status;
2539 status = device_create_file(dev,
2540 &dev_attr_suspend_disk_mode);
2541 if (status < 0)
2542 return status;
2543 }
2544
2545 return status;
2546}
2547
2548static void rdev_init_debugfs(struct regulator_dev *rdev)
2549{
2550#ifdef CONFIG_DEBUG_FS
2551 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
2552 if (IS_ERR(rdev->debugfs) || !rdev->debugfs) {
2553 rdev_warn(rdev, "Failed to create debugfs directory\n");
2554 rdev->debugfs = NULL;
2555 return;
2556 }
2557
2558 debugfs_create_u32("use_count", 0444, rdev->debugfs,
2559 &rdev->use_count);
2560 debugfs_create_u32("open_count", 0444, rdev->debugfs,
2561 &rdev->open_count);
2562#endif
2563}
2564
2565/**
2566 * regulator_register - register regulator
2567 * @regulator_desc: regulator to register
2568 * @dev: struct device for the regulator
2569 * @init_data: platform provided init data, passed through by driver
2570 * @driver_data: private regulator data
2571 *
2572 * Called by regulator drivers to register a regulator.
2573 * Returns 0 on success.
2574 */
2575struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
2576 struct device *dev, const struct regulator_init_data *init_data,
2577 void *driver_data)
2578{
2579 static atomic_t regulator_no = ATOMIC_INIT(0);
2580 struct regulator_dev *rdev;
2581 int ret, i;
2582
2583 if (regulator_desc == NULL)
2584 return ERR_PTR(-EINVAL);
2585
2586 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2587 return ERR_PTR(-EINVAL);
2588
2589 if (regulator_desc->type != REGULATOR_VOLTAGE &&
2590 regulator_desc->type != REGULATOR_CURRENT)
2591 return ERR_PTR(-EINVAL);
2592
2593 if (!init_data)
2594 return ERR_PTR(-EINVAL);
2595
2596 /* Only one of each should be implemented */
2597 WARN_ON(regulator_desc->ops->get_voltage &&
2598 regulator_desc->ops->get_voltage_sel);
2599 WARN_ON(regulator_desc->ops->set_voltage &&
2600 regulator_desc->ops->set_voltage_sel);
2601
2602 /* If we're using selectors we must implement list_voltage. */
2603 if (regulator_desc->ops->get_voltage_sel &&
2604 !regulator_desc->ops->list_voltage) {
2605 return ERR_PTR(-EINVAL);
2606 }
2607 if (regulator_desc->ops->set_voltage_sel &&
2608 !regulator_desc->ops->list_voltage) {
2609 return ERR_PTR(-EINVAL);
2610 }
2611
2612 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2613 if (rdev == NULL)
2614 return ERR_PTR(-ENOMEM);
2615
2616 mutex_lock(®ulator_list_mutex);
2617
2618 mutex_init(&rdev->mutex);
2619 rdev->reg_data = driver_data;
2620 rdev->owner = regulator_desc->owner;
2621 rdev->desc = regulator_desc;
2622 INIT_LIST_HEAD(&rdev->consumer_list);
2623 INIT_LIST_HEAD(&rdev->list);
2624 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2625
2626 /* preform any regulator specific init */
2627 if (init_data->regulator_init) {
2628 ret = init_data->regulator_init(rdev->reg_data);
2629 if (ret < 0)
2630 goto clean;
2631 }
2632
2633 /* register with sysfs */
2634 rdev->dev.class = ®ulator_class;
2635 rdev->dev.parent = dev;
2636 dev_set_name(&rdev->dev, "regulator.%d",
2637 atomic_inc_return(®ulator_no) - 1);
2638 ret = device_register(&rdev->dev);
2639 if (ret != 0) {
2640 put_device(&rdev->dev);
2641 goto clean;
2642 }
2643
2644 dev_set_drvdata(&rdev->dev, rdev);
2645
2646 /* set regulator constraints */
2647 ret = set_machine_constraints(rdev, &init_data->constraints);
2648 if (ret < 0)
2649 goto scrub;
2650
2651 /* add attributes supported by this regulator */
2652 ret = add_regulator_attributes(rdev);
2653 if (ret < 0)
2654 goto scrub;
2655
2656 if (init_data->supply_regulator) {
2657 struct regulator_dev *r;
2658 int found = 0;
2659
2660 list_for_each_entry(r, ®ulator_list, list) {
2661 if (strcmp(rdev_get_name(r),
2662 init_data->supply_regulator) == 0) {
2663 found = 1;
2664 break;
2665 }
2666 }
2667
2668 if (!found) {
2669 dev_err(dev, "Failed to find supply %s\n",
2670 init_data->supply_regulator);
2671 ret = -ENODEV;
2672 goto scrub;
2673 }
2674
2675 ret = set_supply(rdev, r);
2676 if (ret < 0)
2677 goto scrub;
2678 }
2679
2680 /* add consumers devices */
2681 for (i = 0; i < init_data->num_consumer_supplies; i++) {
2682 ret = set_consumer_device_supply(rdev,
2683 init_data->consumer_supplies[i].dev,
2684 init_data->consumer_supplies[i].dev_name,
2685 init_data->consumer_supplies[i].supply);
2686 if (ret < 0) {
2687 dev_err(dev, "Failed to set supply %s\n",
2688 init_data->consumer_supplies[i].supply);
2689 goto unset_supplies;
2690 }
2691 }
2692
2693 list_add(&rdev->list, ®ulator_list);
2694
2695 rdev_init_debugfs(rdev);
2696out:
2697 mutex_unlock(®ulator_list_mutex);
2698 return rdev;
2699
2700unset_supplies:
2701 unset_regulator_supplies(rdev);
2702
2703scrub:
2704 kfree(rdev->constraints);
2705 device_unregister(&rdev->dev);
2706 /* device core frees rdev */
2707 rdev = ERR_PTR(ret);
2708 goto out;
2709
2710clean:
2711 kfree(rdev);
2712 rdev = ERR_PTR(ret);
2713 goto out;
2714}
2715EXPORT_SYMBOL_GPL(regulator_register);
2716
2717/**
2718 * regulator_unregister - unregister regulator
2719 * @rdev: regulator to unregister
2720 *
2721 * Called by regulator drivers to unregister a regulator.
2722 */
2723void regulator_unregister(struct regulator_dev *rdev)
2724{
2725 if (rdev == NULL)
2726 return;
2727
2728 mutex_lock(®ulator_list_mutex);
2729#ifdef CONFIG_DEBUG_FS
2730 debugfs_remove_recursive(rdev->debugfs);
2731#endif
2732 WARN_ON(rdev->open_count);
2733 unset_regulator_supplies(rdev);
2734 list_del(&rdev->list);
2735 if (rdev->supply)
2736 regulator_put(rdev->supply);
2737 device_unregister(&rdev->dev);
2738 kfree(rdev->constraints);
2739 mutex_unlock(®ulator_list_mutex);
2740}
2741EXPORT_SYMBOL_GPL(regulator_unregister);
2742
2743/**
2744 * regulator_suspend_prepare - prepare regulators for system wide suspend
2745 * @state: system suspend state
2746 *
2747 * Configure each regulator with it's suspend operating parameters for state.
2748 * This will usually be called by machine suspend code prior to supending.
2749 */
2750int regulator_suspend_prepare(suspend_state_t state)
2751{
2752 struct regulator_dev *rdev;
2753 int ret = 0;
2754
2755 /* ON is handled by regulator active state */
2756 if (state == PM_SUSPEND_ON)
2757 return -EINVAL;
2758
2759 mutex_lock(®ulator_list_mutex);
2760 list_for_each_entry(rdev, ®ulator_list, list) {
2761
2762 mutex_lock(&rdev->mutex);
2763 ret = suspend_prepare(rdev, state);
2764 mutex_unlock(&rdev->mutex);
2765
2766 if (ret < 0) {
2767 rdev_err(rdev, "failed to prepare\n");
2768 goto out;
2769 }
2770 }
2771out:
2772 mutex_unlock(®ulator_list_mutex);
2773 return ret;
2774}
2775EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2776
2777/**
2778 * regulator_suspend_finish - resume regulators from system wide suspend
2779 *
2780 * Turn on regulators that might be turned off by regulator_suspend_prepare
2781 * and that should be turned on according to the regulators properties.
2782 */
2783int regulator_suspend_finish(void)
2784{
2785 struct regulator_dev *rdev;
2786 int ret = 0, error;
2787
2788 mutex_lock(®ulator_list_mutex);
2789 list_for_each_entry(rdev, ®ulator_list, list) {
2790 struct regulator_ops *ops = rdev->desc->ops;
2791
2792 mutex_lock(&rdev->mutex);
2793 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
2794 ops->enable) {
2795 error = ops->enable(rdev);
2796 if (error)
2797 ret = error;
2798 } else {
2799 if (!has_full_constraints)
2800 goto unlock;
2801 if (!ops->disable)
2802 goto unlock;
2803 if (ops->is_enabled && !ops->is_enabled(rdev))
2804 goto unlock;
2805
2806 error = ops->disable(rdev);
2807 if (error)
2808 ret = error;
2809 }
2810unlock:
2811 mutex_unlock(&rdev->mutex);
2812 }
2813 mutex_unlock(®ulator_list_mutex);
2814 return ret;
2815}
2816EXPORT_SYMBOL_GPL(regulator_suspend_finish);
2817
2818/**
2819 * regulator_has_full_constraints - the system has fully specified constraints
2820 *
2821 * Calling this function will cause the regulator API to disable all
2822 * regulators which have a zero use count and don't have an always_on
2823 * constraint in a late_initcall.
2824 *
2825 * The intention is that this will become the default behaviour in a
2826 * future kernel release so users are encouraged to use this facility
2827 * now.
2828 */
2829void regulator_has_full_constraints(void)
2830{
2831 has_full_constraints = 1;
2832}
2833EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
2834
2835/**
2836 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
2837 *
2838 * Calling this function will cause the regulator API to provide a
2839 * dummy regulator to consumers if no physical regulator is found,
2840 * allowing most consumers to proceed as though a regulator were
2841 * configured. This allows systems such as those with software
2842 * controllable regulators for the CPU core only to be brought up more
2843 * readily.
2844 */
2845void regulator_use_dummy_regulator(void)
2846{
2847 board_wants_dummy_regulator = true;
2848}
2849EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
2850
2851/**
2852 * rdev_get_drvdata - get rdev regulator driver data
2853 * @rdev: regulator
2854 *
2855 * Get rdev regulator driver private data. This call can be used in the
2856 * regulator driver context.
2857 */
2858void *rdev_get_drvdata(struct regulator_dev *rdev)
2859{
2860 return rdev->reg_data;
2861}
2862EXPORT_SYMBOL_GPL(rdev_get_drvdata);
2863
2864/**
2865 * regulator_get_drvdata - get regulator driver data
2866 * @regulator: regulator
2867 *
2868 * Get regulator driver private data. This call can be used in the consumer
2869 * driver context when non API regulator specific functions need to be called.
2870 */
2871void *regulator_get_drvdata(struct regulator *regulator)
2872{
2873 return regulator->rdev->reg_data;
2874}
2875EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2876
2877/**
2878 * regulator_set_drvdata - set regulator driver data
2879 * @regulator: regulator
2880 * @data: data
2881 */
2882void regulator_set_drvdata(struct regulator *regulator, void *data)
2883{
2884 regulator->rdev->reg_data = data;
2885}
2886EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2887
2888/**
2889 * regulator_get_id - get regulator ID
2890 * @rdev: regulator
2891 */
2892int rdev_get_id(struct regulator_dev *rdev)
2893{
2894 return rdev->desc->id;
2895}
2896EXPORT_SYMBOL_GPL(rdev_get_id);
2897
2898struct device *rdev_get_dev(struct regulator_dev *rdev)
2899{
2900 return &rdev->dev;
2901}
2902EXPORT_SYMBOL_GPL(rdev_get_dev);
2903
2904void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2905{
2906 return reg_init_data->driver_data;
2907}
2908EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2909
2910static int __init regulator_init(void)
2911{
2912 int ret;
2913
2914 ret = class_register(®ulator_class);
2915
2916#ifdef CONFIG_DEBUG_FS
2917 debugfs_root = debugfs_create_dir("regulator", NULL);
2918 if (IS_ERR(debugfs_root) || !debugfs_root) {
2919 pr_warn("regulator: Failed to create debugfs directory\n");
2920 debugfs_root = NULL;
2921 }
2922#endif
2923
2924 regulator_dummy_init();
2925
2926 return ret;
2927}
2928
2929/* init early to allow our consumers to complete system booting */
2930core_initcall(regulator_init);
2931
2932static int __init regulator_init_complete(void)
2933{
2934 struct regulator_dev *rdev;
2935 struct regulator_ops *ops;
2936 struct regulation_constraints *c;
2937 int enabled, ret;
2938
2939 mutex_lock(®ulator_list_mutex);
2940
2941 /* If we have a full configuration then disable any regulators
2942 * which are not in use or always_on. This will become the
2943 * default behaviour in the future.
2944 */
2945 list_for_each_entry(rdev, ®ulator_list, list) {
2946 ops = rdev->desc->ops;
2947 c = rdev->constraints;
2948
2949 if (!ops->disable || (c && c->always_on))
2950 continue;
2951
2952 mutex_lock(&rdev->mutex);
2953
2954 if (rdev->use_count)
2955 goto unlock;
2956
2957 /* If we can't read the status assume it's on. */
2958 if (ops->is_enabled)
2959 enabled = ops->is_enabled(rdev);
2960 else
2961 enabled = 1;
2962
2963 if (!enabled)
2964 goto unlock;
2965
2966 if (has_full_constraints) {
2967 /* We log since this may kill the system if it
2968 * goes wrong. */
2969 rdev_info(rdev, "disabling\n");
2970 ret = ops->disable(rdev);
2971 if (ret != 0) {
2972 rdev_err(rdev, "couldn't disable: %d\n", ret);
2973 }
2974 } else {
2975 /* The intention is that in future we will
2976 * assume that full constraints are provided
2977 * so warn even if we aren't going to do
2978 * anything here.
2979 */
2980 rdev_warn(rdev, "incomplete constraints, leaving on\n");
2981 }
2982
2983unlock:
2984 mutex_unlock(&rdev->mutex);
2985 }
2986
2987 mutex_unlock(®ulator_list_mutex);
2988
2989 return 0;
2990}
2991late_initcall(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);