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regulator: Fix some kerneldoc rendering issues
[deliverable/linux.git] / drivers / regulator / core.c
CommitLineData
414c70cb
LG		 1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
a5766f11 5 * Copyright 2008 SlimLogic Ltd.
414c70cb 6 *
a5766f11 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
414c70cb
LG		 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/device.h>
19#include <linux/err.h>
20#include <linux/mutex.h>
21#include <linux/suspend.h>
22#include <linux/regulator/consumer.h>
23#include <linux/regulator/driver.h>
24#include <linux/regulator/machine.h>
25
26#define REGULATOR_VERSION "0.5"
27
28static DEFINE_MUTEX(regulator_list_mutex);
29static LIST_HEAD(regulator_list);
30static LIST_HEAD(regulator_map_list);
31
8dc5390d 32/*
414c70cb
LG		 33 * struct regulator_dev
34 *
35 * Voltage / Current regulator class device. One for each regulator.
36 */
37struct regulator_dev {
38 struct regulator_desc *desc;
39 int use_count;
40
41 /* lists we belong to */
42 struct list_head list; /* list of all regulators */
43 struct list_head slist; /* list of supplied regulators */
44
45 /* lists we own */
46 struct list_head consumer_list; /* consumers we supply */
47 struct list_head supply_list; /* regulators we supply */
48
49 struct blocking_notifier_head notifier;
50 struct mutex mutex; /* consumer lock */
51 struct module *owner;
52 struct device dev;
53 struct regulation_constraints *constraints;
54 struct regulator_dev *supply; /* for tree */
55
56 void *reg_data; /* regulator_dev data */
57};
58
8dc5390d 59/*
414c70cb
LG		 60 * struct regulator_map
61 *
62 * Used to provide symbolic supply names to devices.
63 */
64struct regulator_map {
65 struct list_head list;
66 struct device *dev;
67 const char *supply;
a5766f11 68 struct regulator_dev *regulator;
414c70cb
LG		 69};
70
414c70cb
LG		 71/*
72 * struct regulator
73 *
74 * One for each consumer device.
75 */
76struct regulator {
77 struct device *dev;
78 struct list_head list;
79 int uA_load;
80 int min_uV;
81 int max_uV;
412aec61 82 int enabled; /* count of client enables */
414c70cb
LG		 83 char *supply_name;
84 struct device_attribute dev_attr;
85 struct regulator_dev *rdev;
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);
95
96/* gets the regulator for a given consumer device */
97static struct regulator *get_device_regulator(struct device *dev)
98{
99 struct regulator *regulator = NULL;
100 struct regulator_dev *rdev;
101
102 mutex_lock(&regulator_list_mutex);
103 list_for_each_entry(rdev, &regulator_list, list) {
104 mutex_lock(&rdev->mutex);
105 list_for_each_entry(regulator, &rdev->consumer_list, list) {
106 if (regulator->dev == dev) {
107 mutex_unlock(&rdev->mutex);
108 mutex_unlock(&regulator_list_mutex);
109 return regulator;
110 }
111 }
112 mutex_unlock(&rdev->mutex);
113 }
114 mutex_unlock(&regulator_list_mutex);
115 return NULL;
116}
117
118/* Platform voltage constraint check */
119static int regulator_check_voltage(struct regulator_dev *rdev,
120 int *min_uV, int *max_uV)
121{
122 BUG_ON(*min_uV > *max_uV);
123
124 if (!rdev->constraints) {
125 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
126 rdev->desc->name);
127 return -ENODEV;
128 }
129 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
130 printk(KERN_ERR "%s: operation not allowed for %s\n",
131 __func__, rdev->desc->name);
132 return -EPERM;
133 }
134
135 if (*max_uV > rdev->constraints->max_uV)
136 *max_uV = rdev->constraints->max_uV;
137 if (*min_uV < rdev->constraints->min_uV)
138 *min_uV = rdev->constraints->min_uV;
139
140 if (*min_uV > *max_uV)
141 return -EINVAL;
142
143 return 0;
144}
145
146/* current constraint check */
147static int regulator_check_current_limit(struct regulator_dev *rdev,
148 int *min_uA, int *max_uA)
149{
150 BUG_ON(*min_uA > *max_uA);
151
152 if (!rdev->constraints) {
153 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
154 rdev->desc->name);
155 return -ENODEV;
156 }
157 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
158 printk(KERN_ERR "%s: operation not allowed for %s\n",
159 __func__, rdev->desc->name);
160 return -EPERM;
161 }
162
163 if (*max_uA > rdev->constraints->max_uA)
164 *max_uA = rdev->constraints->max_uA;
165 if (*min_uA < rdev->constraints->min_uA)
166 *min_uA = rdev->constraints->min_uA;
167
168 if (*min_uA > *max_uA)
169 return -EINVAL;
170
171 return 0;
172}
173
174/* operating mode constraint check */
175static int regulator_check_mode(struct regulator_dev *rdev, int mode)
176{
e573520b
DB		 177 switch (mode) {
178 case REGULATOR_MODE_FAST:
179 case REGULATOR_MODE_NORMAL:
180 case REGULATOR_MODE_IDLE:
181 case REGULATOR_MODE_STANDBY:
182 break;
183 default:
184 return -EINVAL;
185 }
186
414c70cb
LG		 187 if (!rdev->constraints) {
188 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
189 rdev->desc->name);
190 return -ENODEV;
191 }
192 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
193 printk(KERN_ERR "%s: operation not allowed for %s\n",
194 __func__, rdev->desc->name);
195 return -EPERM;
196 }
197 if (!(rdev->constraints->valid_modes_mask & mode)) {
198 printk(KERN_ERR "%s: invalid mode %x for %s\n",
199 __func__, mode, rdev->desc->name);
200 return -EINVAL;
201 }
202 return 0;
203}
204
205/* dynamic regulator mode switching constraint check */
206static int regulator_check_drms(struct regulator_dev *rdev)
207{
208 if (!rdev->constraints) {
209 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
210 rdev->desc->name);
211 return -ENODEV;
212 }
213 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
214 printk(KERN_ERR "%s: operation not allowed for %s\n",
215 __func__, rdev->desc->name);
216 return -EPERM;
217 }
218 return 0;
219}
220
221static ssize_t device_requested_uA_show(struct device *dev,
222 struct device_attribute *attr, char *buf)
223{
224 struct regulator *regulator;
225
226 regulator = get_device_regulator(dev);
227 if (regulator == NULL)
228 return 0;
229
230 return sprintf(buf, "%d\n", regulator->uA_load);
231}
232
233static ssize_t regulator_uV_show(struct device *dev,
234 struct device_attribute *attr, char *buf)
235{
a5766f11 236 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 237 ssize_t ret;
238
239 mutex_lock(&rdev->mutex);
240 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
241 mutex_unlock(&rdev->mutex);
242
243 return ret;
244}
7ad68e2f 245static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 246
247static ssize_t regulator_uA_show(struct device *dev,
248 struct device_attribute *attr, char *buf)
249{
a5766f11 250 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 251
252 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
253}
7ad68e2f 254static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 255
bc558a60
MB		 256static ssize_t regulator_name_show(struct device *dev,
257 struct device_attribute *attr, char *buf)
258{
259 struct regulator_dev *rdev = dev_get_drvdata(dev);
260 const char *name;
261
262 if (rdev->constraints->name)
263 name = rdev->constraints->name;
264 else if (rdev->desc->name)
265 name = rdev->desc->name;
266 else
267 name = "";
268
269 return sprintf(buf, "%s\n", name);
270}
271
4fca9545 272static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 273{
414c70cb
LG		 274 switch (mode) {
275 case REGULATOR_MODE_FAST:
276 return sprintf(buf, "fast\n");
277 case REGULATOR_MODE_NORMAL:
278 return sprintf(buf, "normal\n");
279 case REGULATOR_MODE_IDLE:
280 return sprintf(buf, "idle\n");
281 case REGULATOR_MODE_STANDBY:
282 return sprintf(buf, "standby\n");
283 }
284 return sprintf(buf, "unknown\n");
285}
286
4fca9545
DB		 287static ssize_t regulator_opmode_show(struct device *dev,
288 struct device_attribute *attr, char *buf)
414c70cb 289{
a5766f11 290 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 291
4fca9545
DB		 292 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
293}
7ad68e2f 294static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 295
296static ssize_t regulator_print_state(char *buf, int state)
297{
414c70cb
LG		 298 if (state > 0)
299 return sprintf(buf, "enabled\n");
300 else if (state == 0)
301 return sprintf(buf, "disabled\n");
302 else
303 return sprintf(buf, "unknown\n");
304}
305
4fca9545
DB		 306static ssize_t regulator_state_show(struct device *dev,
307 struct device_attribute *attr, char *buf)
308{
309 struct regulator_dev *rdev = dev_get_drvdata(dev);
310
311 return regulator_print_state(buf, _regulator_is_enabled(rdev));
312}
7ad68e2f 313static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 314
414c70cb
LG		 315static ssize_t regulator_min_uA_show(struct device *dev,
316 struct device_attribute *attr, char *buf)
317{
a5766f11 318 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 319
320 if (!rdev->constraints)
321 return sprintf(buf, "constraint not defined\n");
322
323 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
324}
7ad68e2f 325static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 326
327static ssize_t regulator_max_uA_show(struct device *dev,
328 struct device_attribute *attr, char *buf)
329{
a5766f11 330 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 331
332 if (!rdev->constraints)
333 return sprintf(buf, "constraint not defined\n");
334
335 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
336}
7ad68e2f 337static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 338
339static ssize_t regulator_min_uV_show(struct device *dev,
340 struct device_attribute *attr, char *buf)
341{
a5766f11 342 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 343
344 if (!rdev->constraints)
345 return sprintf(buf, "constraint not defined\n");
346
347 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
348}
7ad68e2f 349static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 350
351static ssize_t regulator_max_uV_show(struct device *dev,
352 struct device_attribute *attr, char *buf)
353{
a5766f11 354 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 355
356 if (!rdev->constraints)
357 return sprintf(buf, "constraint not defined\n");
358
359 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
360}
7ad68e2f 361static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 362
363static ssize_t regulator_total_uA_show(struct device *dev,
364 struct device_attribute *attr, char *buf)
365{
a5766f11 366 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 367 struct regulator *regulator;
368 int uA = 0;
369
370 mutex_lock(&rdev->mutex);
371 list_for_each_entry(regulator, &rdev->consumer_list, list)
372 uA += regulator->uA_load;
373 mutex_unlock(&rdev->mutex);
374 return sprintf(buf, "%d\n", uA);
375}
7ad68e2f 376static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb
LG		 377
378static ssize_t regulator_num_users_show(struct device *dev,
379 struct device_attribute *attr, char *buf)
380{
a5766f11 381 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 382 return sprintf(buf, "%d\n", rdev->use_count);
383}
384
385static ssize_t regulator_type_show(struct device *dev,
386 struct device_attribute *attr, char *buf)
387{
a5766f11 388 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 389
390 switch (rdev->desc->type) {
391 case REGULATOR_VOLTAGE:
392 return sprintf(buf, "voltage\n");
393 case REGULATOR_CURRENT:
394 return sprintf(buf, "current\n");
395 }
396 return sprintf(buf, "unknown\n");
397}
398
399static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
400 struct device_attribute *attr, char *buf)
401{
a5766f11 402 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 403
414c70cb
LG		 404 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
405}
7ad68e2f
DB		 406static DEVICE_ATTR(suspend_mem_microvolts, 0444,
407 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 408
409static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
410 struct device_attribute *attr, char *buf)
411{
a5766f11 412 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 413
414c70cb
LG		 414 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
415}
7ad68e2f
DB		 416static DEVICE_ATTR(suspend_disk_microvolts, 0444,
417 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 418
419static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
420 struct device_attribute *attr, char *buf)
421{
a5766f11 422 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 423
414c70cb
LG		 424 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
425}
7ad68e2f
DB		 426static DEVICE_ATTR(suspend_standby_microvolts, 0444,
427 regulator_suspend_standby_uV_show, NULL);
414c70cb 428
414c70cb
LG		 429static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
430 struct device_attribute *attr, char *buf)
431{
a5766f11 432 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 433
4fca9545
DB		 434 return regulator_print_opmode(buf,
435 rdev->constraints->state_mem.mode);
414c70cb 436}
7ad68e2f
DB		 437static DEVICE_ATTR(suspend_mem_mode, 0444,
438 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 439
440static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
441 struct device_attribute *attr, char *buf)
442{
a5766f11 443 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 444
4fca9545
DB		 445 return regulator_print_opmode(buf,
446 rdev->constraints->state_disk.mode);
414c70cb 447}
7ad68e2f
DB		 448static DEVICE_ATTR(suspend_disk_mode, 0444,
449 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 450
451static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
452 struct device_attribute *attr, char *buf)
453{
a5766f11 454 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 455
4fca9545
DB		 456 return regulator_print_opmode(buf,
457 rdev->constraints->state_standby.mode);
414c70cb 458}
7ad68e2f
DB		 459static DEVICE_ATTR(suspend_standby_mode, 0444,
460 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 461
462static ssize_t regulator_suspend_mem_state_show(struct device *dev,
463 struct device_attribute *attr, char *buf)
464{
a5766f11 465 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 466
4fca9545
DB		 467 return regulator_print_state(buf,
468 rdev->constraints->state_mem.enabled);
414c70cb 469}
7ad68e2f
DB		 470static DEVICE_ATTR(suspend_mem_state, 0444,
471 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 472
473static ssize_t regulator_suspend_disk_state_show(struct device *dev,
474 struct device_attribute *attr, char *buf)
475{
a5766f11 476 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 477
4fca9545
DB		 478 return regulator_print_state(buf,
479 rdev->constraints->state_disk.enabled);
414c70cb 480}
7ad68e2f
DB		 481static DEVICE_ATTR(suspend_disk_state, 0444,
482 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 483
484static ssize_t regulator_suspend_standby_state_show(struct device *dev,
485 struct device_attribute *attr, char *buf)
486{
a5766f11 487 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 488
4fca9545
DB		 489 return regulator_print_state(buf,
490 rdev->constraints->state_standby.enabled);
414c70cb 491}
7ad68e2f
DB		 492static DEVICE_ATTR(suspend_standby_state, 0444,
493 regulator_suspend_standby_state_show, NULL);
494
bc558a60 495
7ad68e2f
DB		 496/*
497 * These are the only attributes are present for all regulators.
498 * Other attributes are a function of regulator functionality.
499 */
414c70cb 500static struct device_attribute regulator_dev_attrs[] = {
bc558a60 501 __ATTR(name, 0444, regulator_name_show, NULL),
414c70cb
LG		 502 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
503 __ATTR(type, 0444, regulator_type_show, NULL),
414c70cb
LG		 504 __ATTR_NULL,
505};
506
507static void regulator_dev_release(struct device *dev)
508{
a5766f11 509 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 510 kfree(rdev);
511}
512
513static struct class regulator_class = {
514 .name = "regulator",
515 .dev_release = regulator_dev_release,
516 .dev_attrs = regulator_dev_attrs,
517};
518
519/* Calculate the new optimum regulator operating mode based on the new total
520 * consumer load. All locks held by caller */
521static void drms_uA_update(struct regulator_dev *rdev)
522{
523 struct regulator *sibling;
524 int current_uA = 0, output_uV, input_uV, err;
525 unsigned int mode;
526
527 err = regulator_check_drms(rdev);
528 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
529 !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode);
530 return;
531
532 /* get output voltage */
533 output_uV = rdev->desc->ops->get_voltage(rdev);
534 if (output_uV <= 0)
535 return;
536
537 /* get input voltage */
538 if (rdev->supply && rdev->supply->desc->ops->get_voltage)
539 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
540 else
541 input_uV = rdev->constraints->input_uV;
542 if (input_uV <= 0)
543 return;
544
545 /* calc total requested load */
546 list_for_each_entry(sibling, &rdev->consumer_list, list)
547 current_uA += sibling->uA_load;
548
549 /* now get the optimum mode for our new total regulator load */
550 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
551 output_uV, current_uA);
552
553 /* check the new mode is allowed */
554 err = regulator_check_mode(rdev, mode);
555 if (err == 0)
556 rdev->desc->ops->set_mode(rdev, mode);
557}
558
559static int suspend_set_state(struct regulator_dev *rdev,
560 struct regulator_state *rstate)
561{
562 int ret = 0;
563
564 /* enable & disable are mandatory for suspend control */
565 if (!rdev->desc->ops->set_suspend_enable ||
a5766f11
LG		 566 !rdev->desc->ops->set_suspend_disable) {
567 printk(KERN_ERR "%s: no way to set suspend state\n",
568 __func__);
414c70cb 569 return -EINVAL;
a5766f11 570 }
414c70cb
LG		 571
572 if (rstate->enabled)
573 ret = rdev->desc->ops->set_suspend_enable(rdev);
574 else
575 ret = rdev->desc->ops->set_suspend_disable(rdev);
576 if (ret < 0) {
577 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__);
578 return ret;
579 }
580
581 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
582 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
583 if (ret < 0) {
584 printk(KERN_ERR "%s: failed to set voltage\n",
585 __func__);
586 return ret;
587 }
588 }
589
590 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
591 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
592 if (ret < 0) {
593 printk(KERN_ERR "%s: failed to set mode\n", __func__);
594 return ret;
595 }
596 }
597 return ret;
598}
599
600/* locks held by caller */
601static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
602{
603 if (!rdev->constraints)
604 return -EINVAL;
605
606 switch (state) {
607 case PM_SUSPEND_STANDBY:
608 return suspend_set_state(rdev,
609 &rdev->constraints->state_standby);
610 case PM_SUSPEND_MEM:
611 return suspend_set_state(rdev,
612 &rdev->constraints->state_mem);
613 case PM_SUSPEND_MAX:
614 return suspend_set_state(rdev,
615 &rdev->constraints->state_disk);
616 default:
617 return -EINVAL;
618 }
619}
620
621static void print_constraints(struct regulator_dev *rdev)
622{
623 struct regulation_constraints *constraints = rdev->constraints;
624 char buf[80];
625 int count;
626
627 if (rdev->desc->type == REGULATOR_VOLTAGE) {
628 if (constraints->min_uV == constraints->max_uV)
629 count = sprintf(buf, "%d mV ",
630 constraints->min_uV / 1000);
631 else
632 count = sprintf(buf, "%d <--> %d mV ",
633 constraints->min_uV / 1000,
634 constraints->max_uV / 1000);
635 } else {
636 if (constraints->min_uA == constraints->max_uA)
637 count = sprintf(buf, "%d mA ",
638 constraints->min_uA / 1000);
639 else
640 count = sprintf(buf, "%d <--> %d mA ",
641 constraints->min_uA / 1000,
642 constraints->max_uA / 1000);
643 }
644 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
645 count += sprintf(buf + count, "fast ");
646 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
647 count += sprintf(buf + count, "normal ");
648 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
649 count += sprintf(buf + count, "idle ");
650 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
651 count += sprintf(buf + count, "standby");
652
653 printk(KERN_INFO "regulator: %s: %s\n", rdev->desc->name, buf);
654}
655
a5766f11
LG		 656/**
657 * set_machine_constraints - sets regulator constraints
69279fb9 658 * @rdev: regulator source
c8e7e464 659 * @constraints: constraints to apply
a5766f11
LG		 660 *
661 * Allows platform initialisation code to define and constrain
662 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
663 * Constraints *must* be set by platform code in order for some
664 * regulator operations to proceed i.e. set_voltage, set_current_limit,
665 * set_mode.
666 */
667static int set_machine_constraints(struct regulator_dev *rdev,
668 struct regulation_constraints *constraints)
669{
670 int ret = 0;
e06f5b4f 671 const char *name;
e5fda26c 672 struct regulator_ops *ops = rdev->desc->ops;
e06f5b4f
MB		 673
674 if (constraints->name)
675 name = constraints->name;
676 else if (rdev->desc->name)
677 name = rdev->desc->name;
678 else
679 name = "regulator";
a5766f11
LG		 680
681 rdev->constraints = constraints;
682
683 /* do we need to apply the constraint voltage */
684 if (rdev->constraints->apply_uV &&
685 rdev->constraints->min_uV == rdev->constraints->max_uV &&
e5fda26c
MB		 686 ops->set_voltage) {
687 ret = ops->set_voltage(rdev,
a5766f11
LG		 688 rdev->constraints->min_uV, rdev->constraints->max_uV);
689 if (ret < 0) {
e06f5b4f
MB		 690 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n",
691 __func__,
692 rdev->constraints->min_uV, name);
a5766f11
LG		 693 rdev->constraints = NULL;
694 goto out;
695 }
696 }
697
698 /* are we enabled at boot time by firmware / bootloader */
699 if (rdev->constraints->boot_on)
700 rdev->use_count = 1;
701
702 /* do we need to setup our suspend state */
e06f5b4f 703 if (constraints->initial_state) {
a5766f11 704 ret = suspend_prepare(rdev, constraints->initial_state);
e06f5b4f
MB		 705 if (ret < 0) {
706 printk(KERN_ERR "%s: failed to set suspend state for %s\n",
707 __func__, name);
708 rdev->constraints = NULL;
709 goto out;
710 }
711 }
a5766f11 712
e5fda26c
MB		 713 /* if always_on is set then turn the regulator on if it's not
714 * already on. */
715 if (constraints->always_on && ops->enable &&
716 ((ops->is_enabled && !ops->is_enabled(rdev)) ||
717 (!ops->is_enabled && !constraints->boot_on))) {
718 ret = ops->enable(rdev);
719 if (ret < 0) {
720 printk(KERN_ERR "%s: failed to enable %s\n",
721 __func__, name);
722 rdev->constraints = NULL;
723 goto out;
724 }
725 }
726
a5766f11
LG		 727 print_constraints(rdev);
728out:
729 return ret;
730}
731
732/**
733 * set_supply - set regulator supply regulator
69279fb9
MB		 734 * @rdev: regulator name
735 * @supply_rdev: supply regulator name
a5766f11
LG		 736 *
737 * Called by platform initialisation code to set the supply regulator for this
738 * regulator. This ensures that a regulators supply will also be enabled by the
739 * core if it's child is enabled.
740 */
741static int set_supply(struct regulator_dev *rdev,
742 struct regulator_dev *supply_rdev)
743{
744 int err;
745
746 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
747 "supply");
748 if (err) {
749 printk(KERN_ERR
750 "%s: could not add device link %s err %d\n",
751 __func__, supply_rdev->dev.kobj.name, err);
752 goto out;
753 }
754 rdev->supply = supply_rdev;
755 list_add(&rdev->slist, &supply_rdev->supply_list);
756out:
757 return err;
758}
759
760/**
761 * set_consumer_device_supply: Bind a regulator to a symbolic supply
69279fb9
MB		 762 * @rdev: regulator source
763 * @consumer_dev: device the supply applies to
764 * @supply: symbolic name for supply
a5766f11
LG		 765 *
766 * Allows platform initialisation code to map physical regulator
767 * sources to symbolic names for supplies for use by devices. Devices
768 * should use these symbolic names to request regulators, avoiding the
769 * need to provide board-specific regulator names as platform data.
770 */
771static int set_consumer_device_supply(struct regulator_dev *rdev,
772 struct device *consumer_dev, const char *supply)
773{
774 struct regulator_map *node;
775
776 if (supply == NULL)
777 return -EINVAL;
778
779 node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL);
780 if (node == NULL)
781 return -ENOMEM;
782
783 node->regulator = rdev;
784 node->dev = consumer_dev;
785 node->supply = supply;
786
787 list_add(&node->list, &regulator_map_list);
788 return 0;
789}
790
791static void unset_consumer_device_supply(struct regulator_dev *rdev,
792 struct device *consumer_dev)
793{
794 struct regulator_map *node, *n;
795
796 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
797 if (rdev == node->regulator &&
798 consumer_dev == node->dev) {
799 list_del(&node->list);
800 kfree(node);
801 return;
802 }
803 }
804}
805
414c70cb
LG		 806#define REG_STR_SIZE 32
807
808static struct regulator *create_regulator(struct regulator_dev *rdev,
809 struct device *dev,
810 const char *supply_name)
811{
812 struct regulator *regulator;
813 char buf[REG_STR_SIZE];
814 int err, size;
815
816 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
817 if (regulator == NULL)
818 return NULL;
819
820 mutex_lock(&rdev->mutex);
821 regulator->rdev = rdev;
822 list_add(&regulator->list, &rdev->consumer_list);
823
824 if (dev) {
825 /* create a 'requested_microamps_name' sysfs entry */
826 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
827 supply_name);
828 if (size >= REG_STR_SIZE)
829 goto overflow_err;
830
831 regulator->dev = dev;
832 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
833 if (regulator->dev_attr.attr.name == NULL)
834 goto attr_name_err;
835
836 regulator->dev_attr.attr.owner = THIS_MODULE;
837 regulator->dev_attr.attr.mode = 0444;
838 regulator->dev_attr.show = device_requested_uA_show;
839 err = device_create_file(dev, &regulator->dev_attr);
840 if (err < 0) {
841 printk(KERN_WARNING "%s: could not add regulator_dev"
842 " load sysfs\n", __func__);
843 goto attr_name_err;
844 }
845
846 /* also add a link to the device sysfs entry */
847 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
848 dev->kobj.name, supply_name);
849 if (size >= REG_STR_SIZE)
850 goto attr_err;
851
852 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
853 if (regulator->supply_name == NULL)
854 goto attr_err;
855
856 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
857 buf);
858 if (err) {
859 printk(KERN_WARNING
860 "%s: could not add device link %s err %d\n",
861 __func__, dev->kobj.name, err);
862 device_remove_file(dev, &regulator->dev_attr);
863 goto link_name_err;
864 }
865 }
866 mutex_unlock(&rdev->mutex);
867 return regulator;
868link_name_err:
869 kfree(regulator->supply_name);
870attr_err:
871 device_remove_file(regulator->dev, &regulator->dev_attr);
872attr_name_err:
873 kfree(regulator->dev_attr.attr.name);
874overflow_err:
875 list_del(&regulator->list);
876 kfree(regulator);
877 mutex_unlock(&rdev->mutex);
878 return NULL;
879}
880
881/**
882 * regulator_get - lookup and obtain a reference to a regulator.
883 * @dev: device for regulator "consumer"
884 * @id: Supply name or regulator ID.
885 *
886 * Returns a struct regulator corresponding to the regulator producer,
887 * or IS_ERR() condition containing errno. Use of supply names
888 * configured via regulator_set_device_supply() is strongly
889 * encouraged.
890 */
891struct regulator *regulator_get(struct device *dev, const char *id)
892{
893 struct regulator_dev *rdev;
894 struct regulator_map *map;
895 struct regulator *regulator = ERR_PTR(-ENODEV);
414c70cb
LG		 896
897 if (id == NULL) {
898 printk(KERN_ERR "regulator: get() with no identifier\n");
899 return regulator;
900 }
901
902 mutex_lock(&regulator_list_mutex);
903
904 list_for_each_entry(map, &regulator_map_list, list) {
905 if (dev == map->dev &&
906 strcmp(map->supply, id) == 0) {
a5766f11 907 rdev = map->regulator;
414c70cb 908 goto found;
a5766f11 909 }
414c70cb
LG		 910 }
911 printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n",
912 id);
913 mutex_unlock(&regulator_list_mutex);
914 return regulator;
915
916found:
a5766f11
LG		 917 if (!try_module_get(rdev->owner))
918 goto out;
919
414c70cb
LG		 920 regulator = create_regulator(rdev, dev, id);
921 if (regulator == NULL) {
922 regulator = ERR_PTR(-ENOMEM);
923 module_put(rdev->owner);
924 }
925
a5766f11 926out:
414c70cb
LG		 927 mutex_unlock(&regulator_list_mutex);
928 return regulator;
929}
930EXPORT_SYMBOL_GPL(regulator_get);
931
932/**
933 * regulator_put - "free" the regulator source
934 * @regulator: regulator source
935 *
936 * Note: drivers must ensure that all regulator_enable calls made on this
937 * regulator source are balanced by regulator_disable calls prior to calling
938 * this function.
939 */
940void regulator_put(struct regulator *regulator)
941{
942 struct regulator_dev *rdev;
943
944 if (regulator == NULL || IS_ERR(regulator))
945 return;
946
414c70cb
LG		 947 mutex_lock(&regulator_list_mutex);
948 rdev = regulator->rdev;
949
412aec61
DB		 950 if (WARN(regulator->enabled, "Releasing supply %s while enabled\n",
951 regulator->supply_name))
952 _regulator_disable(rdev);
953
414c70cb
LG		 954 /* remove any sysfs entries */
955 if (regulator->dev) {
956 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
957 kfree(regulator->supply_name);
958 device_remove_file(regulator->dev, &regulator->dev_attr);
959 kfree(regulator->dev_attr.attr.name);
960 }
961 list_del(&regulator->list);
962 kfree(regulator);
963
964 module_put(rdev->owner);
965 mutex_unlock(&regulator_list_mutex);
966}
967EXPORT_SYMBOL_GPL(regulator_put);
968
969/* locks held by regulator_enable() */
970static int _regulator_enable(struct regulator_dev *rdev)
971{
972 int ret = -EINVAL;
973
974 if (!rdev->constraints) {
975 printk(KERN_ERR "%s: %s has no constraints\n",
976 __func__, rdev->desc->name);
977 return ret;
978 }
979
980 /* do we need to enable the supply regulator first */
981 if (rdev->supply) {
982 ret = _regulator_enable(rdev->supply);
983 if (ret < 0) {
984 printk(KERN_ERR "%s: failed to enable %s: %d\n",
985 __func__, rdev->desc->name, ret);
986 return ret;
987 }
988 }
989
990 /* check voltage and requested load before enabling */
991 if (rdev->desc->ops->enable) {
992
993 if (rdev->constraints &&
994 (rdev->constraints->valid_ops_mask &
995 REGULATOR_CHANGE_DRMS))
996 drms_uA_update(rdev);
997
998 ret = rdev->desc->ops->enable(rdev);
999 if (ret < 0) {
1000 printk(KERN_ERR "%s: failed to enable %s: %d\n",
1001 __func__, rdev->desc->name, ret);
1002 return ret;
1003 }
1004 rdev->use_count++;
1005 return ret;
1006 }
1007
1008 return ret;
1009}
1010
1011/**
1012 * regulator_enable - enable regulator output
1013 * @regulator: regulator source
1014 *
cf7bbcdf
MB		 1015 * Request that the regulator be enabled with the regulator output at
1016 * the predefined voltage or current value. Calls to regulator_enable()
1017 * must be balanced with calls to regulator_disable().
1018 *
414c70cb 1019 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 1020 * hardwired in the regulator.
414c70cb
LG		 1021 */
1022int regulator_enable(struct regulator *regulator)
1023{
412aec61
DB		 1024 struct regulator_dev *rdev = regulator->rdev;
1025 int ret = 0;
414c70cb 1026
412aec61
DB		 1027 mutex_lock(&rdev->mutex);
1028 if (regulator->enabled == 0)
1029 ret = _regulator_enable(rdev);
1030 else if (regulator->enabled < 0)
1031 ret = -EIO;
1032 if (ret == 0)
1033 regulator->enabled++;
1034 mutex_unlock(&rdev->mutex);
414c70cb
LG		 1035 return ret;
1036}
1037EXPORT_SYMBOL_GPL(regulator_enable);
1038
1039/* locks held by regulator_disable() */
1040static int _regulator_disable(struct regulator_dev *rdev)
1041{
1042 int ret = 0;
1043
1044 /* are we the last user and permitted to disable ? */
1045 if (rdev->use_count == 1 && !rdev->constraints->always_on) {
1046
1047 /* we are last user */
1048 if (rdev->desc->ops->disable) {
1049 ret = rdev->desc->ops->disable(rdev);
1050 if (ret < 0) {
1051 printk(KERN_ERR "%s: failed to disable %s\n",
1052 __func__, rdev->desc->name);
1053 return ret;
1054 }
1055 }
1056
1057 /* decrease our supplies ref count and disable if required */
1058 if (rdev->supply)
1059 _regulator_disable(rdev->supply);
1060
1061 rdev->use_count = 0;
1062 } else if (rdev->use_count > 1) {
1063
1064 if (rdev->constraints &&
1065 (rdev->constraints->valid_ops_mask &
1066 REGULATOR_CHANGE_DRMS))
1067 drms_uA_update(rdev);
1068
1069 rdev->use_count--;
1070 }
1071 return ret;
1072}
1073
1074/**
1075 * regulator_disable - disable regulator output
1076 * @regulator: regulator source
1077 *
cf7bbcdf
MB		 1078 * Disable the regulator output voltage or current. Calls to
1079 * regulator_enable() must be balanced with calls to
1080 * regulator_disable().
69279fb9 1081 *
414c70cb 1082 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 1083 * devices have it enabled, the regulator device supports disabling and
1084 * machine constraints permit this operation.
414c70cb
LG		 1085 */
1086int regulator_disable(struct regulator *regulator)
1087{
412aec61
DB		 1088 struct regulator_dev *rdev = regulator->rdev;
1089 int ret = 0;
414c70cb 1090
412aec61
DB		 1091 mutex_lock(&rdev->mutex);
1092 if (regulator->enabled == 1) {
1093 ret = _regulator_disable(rdev);
1094 if (ret == 0)
1095 regulator->uA_load = 0;
1096 } else if (WARN(regulator->enabled <= 0,
1097 "unbalanced disables for supply %s\n",
1098 regulator->supply_name))
1099 ret = -EIO;
1100 if (ret == 0)
1101 regulator->enabled--;
1102 mutex_unlock(&rdev->mutex);
414c70cb
LG		 1103 return ret;
1104}
1105EXPORT_SYMBOL_GPL(regulator_disable);
1106
1107/* locks held by regulator_force_disable() */
1108static int _regulator_force_disable(struct regulator_dev *rdev)
1109{
1110 int ret = 0;
1111
1112 /* force disable */
1113 if (rdev->desc->ops->disable) {
1114 /* ah well, who wants to live forever... */
1115 ret = rdev->desc->ops->disable(rdev);
1116 if (ret < 0) {
1117 printk(KERN_ERR "%s: failed to force disable %s\n",
1118 __func__, rdev->desc->name);
1119 return ret;
1120 }
1121 /* notify other consumers that power has been forced off */
1122 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE,
1123 NULL);
1124 }
1125
1126 /* decrease our supplies ref count and disable if required */
1127 if (rdev->supply)
1128 _regulator_disable(rdev->supply);
1129
1130 rdev->use_count = 0;
1131 return ret;
1132}
1133
1134/**
1135 * regulator_force_disable - force disable regulator output
1136 * @regulator: regulator source
1137 *
1138 * Forcibly disable the regulator output voltage or current.
1139 * NOTE: this *will* disable the regulator output even if other consumer
1140 * devices have it enabled. This should be used for situations when device
1141 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1142 */
1143int regulator_force_disable(struct regulator *regulator)
1144{
1145 int ret;
1146
1147 mutex_lock(&regulator->rdev->mutex);
1148 regulator->enabled = 0;
1149 regulator->uA_load = 0;
1150 ret = _regulator_force_disable(regulator->rdev);
1151 mutex_unlock(&regulator->rdev->mutex);
1152 return ret;
1153}
1154EXPORT_SYMBOL_GPL(regulator_force_disable);
1155
1156static int _regulator_is_enabled(struct regulator_dev *rdev)
1157{
1158 int ret;
1159
1160 mutex_lock(&rdev->mutex);
1161
1162 /* sanity check */
1163 if (!rdev->desc->ops->is_enabled) {
1164 ret = -EINVAL;
1165 goto out;
1166 }
1167
1168 ret = rdev->desc->ops->is_enabled(rdev);
1169out:
1170 mutex_unlock(&rdev->mutex);
1171 return ret;
1172}
1173
1174/**
1175 * regulator_is_enabled - is the regulator output enabled
1176 * @regulator: regulator source
1177 *
412aec61
DB		 1178 * Returns positive if the regulator driver backing the source/client
1179 * has requested that the device be enabled, zero if it hasn't, else a
1180 * negative errno code.
1181 *
1182 * Note that the device backing this regulator handle can have multiple
1183 * users, so it might be enabled even if regulator_enable() was never
1184 * called for this particular source.
414c70cb
LG		 1185 */
1186int regulator_is_enabled(struct regulator *regulator)
1187{
1188 return _regulator_is_enabled(regulator->rdev);
1189}
1190EXPORT_SYMBOL_GPL(regulator_is_enabled);
1191
1192/**
1193 * regulator_set_voltage - set regulator output voltage
1194 * @regulator: regulator source
1195 * @min_uV: Minimum required voltage in uV
1196 * @max_uV: Maximum acceptable voltage in uV
1197 *
1198 * Sets a voltage regulator to the desired output voltage. This can be set
1199 * during any regulator state. IOW, regulator can be disabled or enabled.
1200 *
1201 * If the regulator is enabled then the voltage will change to the new value
1202 * immediately otherwise if the regulator is disabled the regulator will
1203 * output at the new voltage when enabled.
1204 *
1205 * NOTE: If the regulator is shared between several devices then the lowest
1206 * request voltage that meets the system constraints will be used.
69279fb9 1207 * Regulator system constraints must be set for this regulator before
414c70cb
LG		 1208 * calling this function otherwise this call will fail.
1209 */
1210int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1211{
1212 struct regulator_dev *rdev = regulator->rdev;
1213 int ret;
1214
1215 mutex_lock(&rdev->mutex);
1216
1217 /* sanity check */
1218 if (!rdev->desc->ops->set_voltage) {
1219 ret = -EINVAL;
1220 goto out;
1221 }
1222
1223 /* constraints check */
1224 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1225 if (ret < 0)
1226 goto out;
1227 regulator->min_uV = min_uV;
1228 regulator->max_uV = max_uV;
1229 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
1230
1231out:
1232 mutex_unlock(&rdev->mutex);
1233 return ret;
1234}
1235EXPORT_SYMBOL_GPL(regulator_set_voltage);
1236
1237static int _regulator_get_voltage(struct regulator_dev *rdev)
1238{
1239 /* sanity check */
1240 if (rdev->desc->ops->get_voltage)
1241 return rdev->desc->ops->get_voltage(rdev);
1242 else
1243 return -EINVAL;
1244}
1245
1246/**
1247 * regulator_get_voltage - get regulator output voltage
1248 * @regulator: regulator source
1249 *
1250 * This returns the current regulator voltage in uV.
1251 *
1252 * NOTE: If the regulator is disabled it will return the voltage value. This
1253 * function should not be used to determine regulator state.
1254 */
1255int regulator_get_voltage(struct regulator *regulator)
1256{
1257 int ret;
1258
1259 mutex_lock(&regulator->rdev->mutex);
1260
1261 ret = _regulator_get_voltage(regulator->rdev);
1262
1263 mutex_unlock(&regulator->rdev->mutex);
1264
1265 return ret;
1266}
1267EXPORT_SYMBOL_GPL(regulator_get_voltage);
1268
1269/**
1270 * regulator_set_current_limit - set regulator output current limit
1271 * @regulator: regulator source
1272 * @min_uA: Minimuum supported current in uA
1273 * @max_uA: Maximum supported current in uA
1274 *
1275 * Sets current sink to the desired output current. This can be set during
1276 * any regulator state. IOW, regulator can be disabled or enabled.
1277 *
1278 * If the regulator is enabled then the current will change to the new value
1279 * immediately otherwise if the regulator is disabled the regulator will
1280 * output at the new current when enabled.
1281 *
1282 * NOTE: Regulator system constraints must be set for this regulator before
1283 * calling this function otherwise this call will fail.
1284 */
1285int regulator_set_current_limit(struct regulator *regulator,
1286 int min_uA, int max_uA)
1287{
1288 struct regulator_dev *rdev = regulator->rdev;
1289 int ret;
1290
1291 mutex_lock(&rdev->mutex);
1292
1293 /* sanity check */
1294 if (!rdev->desc->ops->set_current_limit) {
1295 ret = -EINVAL;
1296 goto out;
1297 }
1298
1299 /* constraints check */
1300 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1301 if (ret < 0)
1302 goto out;
1303
1304 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1305out:
1306 mutex_unlock(&rdev->mutex);
1307 return ret;
1308}
1309EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1310
1311static int _regulator_get_current_limit(struct regulator_dev *rdev)
1312{
1313 int ret;
1314
1315 mutex_lock(&rdev->mutex);
1316
1317 /* sanity check */
1318 if (!rdev->desc->ops->get_current_limit) {
1319 ret = -EINVAL;
1320 goto out;
1321 }
1322
1323 ret = rdev->desc->ops->get_current_limit(rdev);
1324out:
1325 mutex_unlock(&rdev->mutex);
1326 return ret;
1327}
1328
1329/**
1330 * regulator_get_current_limit - get regulator output current
1331 * @regulator: regulator source
1332 *
1333 * This returns the current supplied by the specified current sink in uA.
1334 *
1335 * NOTE: If the regulator is disabled it will return the current value. This
1336 * function should not be used to determine regulator state.
1337 */
1338int regulator_get_current_limit(struct regulator *regulator)
1339{
1340 return _regulator_get_current_limit(regulator->rdev);
1341}
1342EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1343
1344/**
1345 * regulator_set_mode - set regulator operating mode
1346 * @regulator: regulator source
1347 * @mode: operating mode - one of the REGULATOR_MODE constants
1348 *
1349 * Set regulator operating mode to increase regulator efficiency or improve
1350 * regulation performance.
1351 *
1352 * NOTE: Regulator system constraints must be set for this regulator before
1353 * calling this function otherwise this call will fail.
1354 */
1355int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1356{
1357 struct regulator_dev *rdev = regulator->rdev;
1358 int ret;
1359
1360 mutex_lock(&rdev->mutex);
1361
1362 /* sanity check */
1363 if (!rdev->desc->ops->set_mode) {
1364 ret = -EINVAL;
1365 goto out;
1366 }
1367
1368 /* constraints check */
1369 ret = regulator_check_mode(rdev, mode);
1370 if (ret < 0)
1371 goto out;
1372
1373 ret = rdev->desc->ops->set_mode(rdev, mode);
1374out:
1375 mutex_unlock(&rdev->mutex);
1376 return ret;
1377}
1378EXPORT_SYMBOL_GPL(regulator_set_mode);
1379
1380static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
1381{
1382 int ret;
1383
1384 mutex_lock(&rdev->mutex);
1385
1386 /* sanity check */
1387 if (!rdev->desc->ops->get_mode) {
1388 ret = -EINVAL;
1389 goto out;
1390 }
1391
1392 ret = rdev->desc->ops->get_mode(rdev);
1393out:
1394 mutex_unlock(&rdev->mutex);
1395 return ret;
1396}
1397
1398/**
1399 * regulator_get_mode - get regulator operating mode
1400 * @regulator: regulator source
1401 *
1402 * Get the current regulator operating mode.
1403 */
1404unsigned int regulator_get_mode(struct regulator *regulator)
1405{
1406 return _regulator_get_mode(regulator->rdev);
1407}
1408EXPORT_SYMBOL_GPL(regulator_get_mode);
1409
1410/**
1411 * regulator_set_optimum_mode - set regulator optimum operating mode
1412 * @regulator: regulator source
1413 * @uA_load: load current
1414 *
1415 * Notifies the regulator core of a new device load. This is then used by
1416 * DRMS (if enabled by constraints) to set the most efficient regulator
1417 * operating mode for the new regulator loading.
1418 *
1419 * Consumer devices notify their supply regulator of the maximum power
1420 * they will require (can be taken from device datasheet in the power
1421 * consumption tables) when they change operational status and hence power
1422 * state. Examples of operational state changes that can affect power
1423 * consumption are :-
1424 *
1425 * o Device is opened / closed.
1426 * o Device I/O is about to begin or has just finished.
1427 * o Device is idling in between work.
1428 *
1429 * This information is also exported via sysfs to userspace.
1430 *
1431 * DRMS will sum the total requested load on the regulator and change
1432 * to the most efficient operating mode if platform constraints allow.
1433 *
1434 * Returns the new regulator mode or error.
1435 */
1436int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
1437{
1438 struct regulator_dev *rdev = regulator->rdev;
1439 struct regulator *consumer;
1440 int ret, output_uV, input_uV, total_uA_load = 0;
1441 unsigned int mode;
1442
1443 mutex_lock(&rdev->mutex);
1444
1445 regulator->uA_load = uA_load;
1446 ret = regulator_check_drms(rdev);
1447 if (ret < 0)
1448 goto out;
1449 ret = -EINVAL;
1450
1451 /* sanity check */
1452 if (!rdev->desc->ops->get_optimum_mode)
1453 goto out;
1454
1455 /* get output voltage */
1456 output_uV = rdev->desc->ops->get_voltage(rdev);
1457 if (output_uV <= 0) {
1458 printk(KERN_ERR "%s: invalid output voltage found for %s\n",
1459 __func__, rdev->desc->name);
1460 goto out;
1461 }
1462
1463 /* get input voltage */
1464 if (rdev->supply && rdev->supply->desc->ops->get_voltage)
1465 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
1466 else
1467 input_uV = rdev->constraints->input_uV;
1468 if (input_uV <= 0) {
1469 printk(KERN_ERR "%s: invalid input voltage found for %s\n",
1470 __func__, rdev->desc->name);
1471 goto out;
1472 }
1473
1474 /* calc total requested load for this regulator */
1475 list_for_each_entry(consumer, &rdev->consumer_list, list)
1476 total_uA_load += consumer->uA_load;
1477
1478 mode = rdev->desc->ops->get_optimum_mode(rdev,
1479 input_uV, output_uV,
1480 total_uA_load);
e573520b
DB		 1481 ret = regulator_check_mode(rdev, mode);
1482 if (ret < 0) {
414c70cb
LG		 1483 printk(KERN_ERR "%s: failed to get optimum mode for %s @"
1484 " %d uA %d -> %d uV\n", __func__, rdev->desc->name,
1485 total_uA_load, input_uV, output_uV);
1486 goto out;
1487 }
1488
1489 ret = rdev->desc->ops->set_mode(rdev, mode);
e573520b 1490 if (ret < 0) {
414c70cb
LG		 1491 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n",
1492 __func__, mode, rdev->desc->name);
1493 goto out;
1494 }
1495 ret = mode;
1496out:
1497 mutex_unlock(&rdev->mutex);
1498 return ret;
1499}
1500EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
1501
1502/**
1503 * regulator_register_notifier - register regulator event notifier
1504 * @regulator: regulator source
69279fb9 1505 * @nb: notifier block
414c70cb
LG		 1506 *
1507 * Register notifier block to receive regulator events.
1508 */
1509int regulator_register_notifier(struct regulator *regulator,
1510 struct notifier_block *nb)
1511{
1512 return blocking_notifier_chain_register(&regulator->rdev->notifier,
1513 nb);
1514}
1515EXPORT_SYMBOL_GPL(regulator_register_notifier);
1516
1517/**
1518 * regulator_unregister_notifier - unregister regulator event notifier
1519 * @regulator: regulator source
69279fb9 1520 * @nb: notifier block
414c70cb
LG		 1521 *
1522 * Unregister regulator event notifier block.
1523 */
1524int regulator_unregister_notifier(struct regulator *regulator,
1525 struct notifier_block *nb)
1526{
1527 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
1528 nb);
1529}
1530EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
1531
1532/* notify regulator consumers and downstream regulator consumers */
1533static void _notifier_call_chain(struct regulator_dev *rdev,
1534 unsigned long event, void *data)
1535{
1536 struct regulator_dev *_rdev;
1537
1538 /* call rdev chain first */
1539 mutex_lock(&rdev->mutex);
1540 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
1541 mutex_unlock(&rdev->mutex);
1542
1543 /* now notify regulator we supply */
1544 list_for_each_entry(_rdev, &rdev->supply_list, slist)
1545 _notifier_call_chain(_rdev, event, data);
1546}
1547
1548/**
1549 * regulator_bulk_get - get multiple regulator consumers
1550 *
1551 * @dev: Device to supply
1552 * @num_consumers: Number of consumers to register
1553 * @consumers: Configuration of consumers; clients are stored here.
1554 *
1555 * @return 0 on success, an errno on failure.
1556 *
1557 * This helper function allows drivers to get several regulator
1558 * consumers in one operation. If any of the regulators cannot be
1559 * acquired then any regulators that were allocated will be freed
1560 * before returning to the caller.
1561 */
1562int regulator_bulk_get(struct device *dev, int num_consumers,
1563 struct regulator_bulk_data *consumers)
1564{
1565 int i;
1566 int ret;
1567
1568 for (i = 0; i < num_consumers; i++)
1569 consumers[i].consumer = NULL;
1570
1571 for (i = 0; i < num_consumers; i++) {
1572 consumers[i].consumer = regulator_get(dev,
1573 consumers[i].supply);
1574 if (IS_ERR(consumers[i].consumer)) {
1575 dev_err(dev, "Failed to get supply '%s'\n",
1576 consumers[i].supply);
1577 ret = PTR_ERR(consumers[i].consumer);
1578 consumers[i].consumer = NULL;
1579 goto err;
1580 }
1581 }
1582
1583 return 0;
1584
1585err:
1586 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
1587 regulator_put(consumers[i].consumer);
1588
1589 return ret;
1590}
1591EXPORT_SYMBOL_GPL(regulator_bulk_get);
1592
1593/**
1594 * regulator_bulk_enable - enable multiple regulator consumers
1595 *
1596 * @num_consumers: Number of consumers
1597 * @consumers: Consumer data; clients are stored here.
1598 * @return 0 on success, an errno on failure
1599 *
1600 * This convenience API allows consumers to enable multiple regulator
1601 * clients in a single API call. If any consumers cannot be enabled
1602 * then any others that were enabled will be disabled again prior to
1603 * return.
1604 */
1605int regulator_bulk_enable(int num_consumers,
1606 struct regulator_bulk_data *consumers)
1607{
1608 int i;
1609 int ret;
1610
1611 for (i = 0; i < num_consumers; i++) {
1612 ret = regulator_enable(consumers[i].consumer);
1613 if (ret != 0)
1614 goto err;
1615 }
1616
1617 return 0;
1618
1619err:
1620 printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply);
1621 for (i = 0; i < num_consumers; i++)
1622 regulator_disable(consumers[i].consumer);
1623
1624 return ret;
1625}
1626EXPORT_SYMBOL_GPL(regulator_bulk_enable);
1627
1628/**
1629 * regulator_bulk_disable - disable multiple regulator consumers
1630 *
1631 * @num_consumers: Number of consumers
1632 * @consumers: Consumer data; clients are stored here.
1633 * @return 0 on success, an errno on failure
1634 *
1635 * This convenience API allows consumers to disable multiple regulator
1636 * clients in a single API call. If any consumers cannot be enabled
1637 * then any others that were disabled will be disabled again prior to
1638 * return.
1639 */
1640int regulator_bulk_disable(int num_consumers,
1641 struct regulator_bulk_data *consumers)
1642{
1643 int i;
1644 int ret;
1645
1646 for (i = 0; i < num_consumers; i++) {
1647 ret = regulator_disable(consumers[i].consumer);
1648 if (ret != 0)
1649 goto err;
1650 }
1651
1652 return 0;
1653
1654err:
1655 printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply);
1656 for (i = 0; i < num_consumers; i++)
1657 regulator_enable(consumers[i].consumer);
1658
1659 return ret;
1660}
1661EXPORT_SYMBOL_GPL(regulator_bulk_disable);
1662
1663/**
1664 * regulator_bulk_free - free multiple regulator consumers
1665 *
1666 * @num_consumers: Number of consumers
1667 * @consumers: Consumer data; clients are stored here.
1668 *
1669 * This convenience API allows consumers to free multiple regulator
1670 * clients in a single API call.
1671 */
1672void regulator_bulk_free(int num_consumers,
1673 struct regulator_bulk_data *consumers)
1674{
1675 int i;
1676
1677 for (i = 0; i < num_consumers; i++) {
1678 regulator_put(consumers[i].consumer);
1679 consumers[i].consumer = NULL;
1680 }
1681}
1682EXPORT_SYMBOL_GPL(regulator_bulk_free);
1683
1684/**
1685 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 1686 * @rdev: regulator source
414c70cb 1687 * @event: notifier block
69279fb9 1688 * @data: callback-specific data.
414c70cb
LG		 1689 *
1690 * Called by regulator drivers to notify clients a regulator event has
1691 * occurred. We also notify regulator clients downstream.
1692 */
1693int regulator_notifier_call_chain(struct regulator_dev *rdev,
1694 unsigned long event, void *data)
1695{
1696 _notifier_call_chain(rdev, event, data);
1697 return NOTIFY_DONE;
1698
1699}
1700EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
1701
7ad68e2f
DB		 1702/*
1703 * To avoid cluttering sysfs (and memory) with useless state, only
1704 * create attributes that can be meaningfully displayed.
1705 */
1706static int add_regulator_attributes(struct regulator_dev *rdev)
1707{
1708 struct device *dev = &rdev->dev;
1709 struct regulator_ops *ops = rdev->desc->ops;
1710 int status = 0;
1711
1712 /* some attributes need specific methods to be displayed */
1713 if (ops->get_voltage) {
1714 status = device_create_file(dev, &dev_attr_microvolts);
1715 if (status < 0)
1716 return status;
1717 }
1718 if (ops->get_current_limit) {
1719 status = device_create_file(dev, &dev_attr_microamps);
1720 if (status < 0)
1721 return status;
1722 }
1723 if (ops->get_mode) {
1724 status = device_create_file(dev, &dev_attr_opmode);
1725 if (status < 0)
1726 return status;
1727 }
1728 if (ops->is_enabled) {
1729 status = device_create_file(dev, &dev_attr_state);
1730 if (status < 0)
1731 return status;
1732 }
1733
1734 /* some attributes are type-specific */
1735 if (rdev->desc->type == REGULATOR_CURRENT) {
1736 status = device_create_file(dev, &dev_attr_requested_microamps);
1737 if (status < 0)
1738 return status;
1739 }
1740
1741 /* all the other attributes exist to support constraints;
1742 * don't show them if there are no constraints, or if the
1743 * relevant supporting methods are missing.
1744 */
1745 if (!rdev->constraints)
1746 return status;
1747
1748 /* constraints need specific supporting methods */
1749 if (ops->set_voltage) {
1750 status = device_create_file(dev, &dev_attr_min_microvolts);
1751 if (status < 0)
1752 return status;
1753 status = device_create_file(dev, &dev_attr_max_microvolts);
1754 if (status < 0)
1755 return status;
1756 }
1757 if (ops->set_current_limit) {
1758 status = device_create_file(dev, &dev_attr_min_microamps);
1759 if (status < 0)
1760 return status;
1761 status = device_create_file(dev, &dev_attr_max_microamps);
1762 if (status < 0)
1763 return status;
1764 }
1765
1766 /* suspend mode constraints need multiple supporting methods */
1767 if (!(ops->set_suspend_enable && ops->set_suspend_disable))
1768 return status;
1769
1770 status = device_create_file(dev, &dev_attr_suspend_standby_state);
1771 if (status < 0)
1772 return status;
1773 status = device_create_file(dev, &dev_attr_suspend_mem_state);
1774 if (status < 0)
1775 return status;
1776 status = device_create_file(dev, &dev_attr_suspend_disk_state);
1777 if (status < 0)
1778 return status;
1779
1780 if (ops->set_suspend_voltage) {
1781 status = device_create_file(dev,
1782 &dev_attr_suspend_standby_microvolts);
1783 if (status < 0)
1784 return status;
1785 status = device_create_file(dev,
1786 &dev_attr_suspend_mem_microvolts);
1787 if (status < 0)
1788 return status;
1789 status = device_create_file(dev,
1790 &dev_attr_suspend_disk_microvolts);
1791 if (status < 0)
1792 return status;
1793 }
1794
1795 if (ops->set_suspend_mode) {
1796 status = device_create_file(dev,
1797 &dev_attr_suspend_standby_mode);
1798 if (status < 0)
1799 return status;
1800 status = device_create_file(dev,
1801 &dev_attr_suspend_mem_mode);
1802 if (status < 0)
1803 return status;
1804 status = device_create_file(dev,
1805 &dev_attr_suspend_disk_mode);
1806 if (status < 0)
1807 return status;
1808 }
1809
1810 return status;
1811}
1812
414c70cb
LG		 1813/**
1814 * regulator_register - register regulator
69279fb9
MB		 1815 * @regulator_desc: regulator to register
1816 * @dev: struct device for the regulator
1817 * @driver_data: private regulator data
414c70cb
LG		 1818 *
1819 * Called by regulator drivers to register a regulator.
1820 * Returns 0 on success.
1821 */
1822struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
a5766f11 1823 struct device *dev, void *driver_data)
414c70cb
LG		 1824{
1825 static atomic_t regulator_no = ATOMIC_INIT(0);
1826 struct regulator_dev *rdev;
a5766f11
LG		 1827 struct regulator_init_data *init_data = dev->platform_data;
1828 int ret, i;
414c70cb
LG		 1829
1830 if (regulator_desc == NULL)
1831 return ERR_PTR(-EINVAL);
1832
1833 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
1834 return ERR_PTR(-EINVAL);
1835
1836 if (!regulator_desc->type == REGULATOR_VOLTAGE &&
1837 !regulator_desc->type == REGULATOR_CURRENT)
1838 return ERR_PTR(-EINVAL);
1839
46fabe1e
MB		 1840 if (!init_data)
1841 return ERR_PTR(-EINVAL);
1842
414c70cb
LG		 1843 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
1844 if (rdev == NULL)
1845 return ERR_PTR(-ENOMEM);
1846
1847 mutex_lock(&regulator_list_mutex);
1848
1849 mutex_init(&rdev->mutex);
a5766f11 1850 rdev->reg_data = driver_data;
414c70cb
LG		 1851 rdev->owner = regulator_desc->owner;
1852 rdev->desc = regulator_desc;
1853 INIT_LIST_HEAD(&rdev->consumer_list);
1854 INIT_LIST_HEAD(&rdev->supply_list);
1855 INIT_LIST_HEAD(&rdev->list);
1856 INIT_LIST_HEAD(&rdev->slist);
1857 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
1858
a5766f11
LG		 1859 /* preform any regulator specific init */
1860 if (init_data->regulator_init) {
1861 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 1862 if (ret < 0)
1863 goto clean;
a5766f11
LG		 1864 }
1865
a5766f11 1866 /* register with sysfs */
414c70cb 1867 rdev->dev.class = &regulator_class;
a5766f11 1868 rdev->dev.parent = dev;
812460a9
KS		 1869 dev_set_name(&rdev->dev, "regulator.%d",
1870 atomic_inc_return(&regulator_no) - 1);
a5766f11 1871 ret = device_register(&rdev->dev);
4fca9545
DB		 1872 if (ret != 0)
1873 goto clean;
a5766f11
LG		 1874
1875 dev_set_drvdata(&rdev->dev, rdev);
1876
74f544c1
MR		 1877 /* set regulator constraints */
1878 ret = set_machine_constraints(rdev, &init_data->constraints);
1879 if (ret < 0)
1880 goto scrub;
1881
7ad68e2f
DB		 1882 /* add attributes supported by this regulator */
1883 ret = add_regulator_attributes(rdev);
1884 if (ret < 0)
1885 goto scrub;
1886
a5766f11
LG		 1887 /* set supply regulator if it exists */
1888 if (init_data->supply_regulator_dev) {
1889 ret = set_supply(rdev,
1890 dev_get_drvdata(init_data->supply_regulator_dev));
4fca9545
DB		 1891 if (ret < 0)
1892 goto scrub;
a5766f11
LG		 1893 }
1894
1895 /* add consumers devices */
1896 for (i = 0; i < init_data->num_consumer_supplies; i++) {
1897 ret = set_consumer_device_supply(rdev,
1898 init_data->consumer_supplies[i].dev,
1899 init_data->consumer_supplies[i].supply);
1900 if (ret < 0) {
1901 for (--i; i >= 0; i--)
1902 unset_consumer_device_supply(rdev,
1903 init_data->consumer_supplies[i].dev);
4fca9545 1904 goto scrub;
a5766f11 1905 }
414c70cb 1906 }
a5766f11
LG		 1907
1908 list_add(&rdev->list, &regulator_list);
1909out:
414c70cb
LG		 1910 mutex_unlock(&regulator_list_mutex);
1911 return rdev;
4fca9545
DB		 1912
1913scrub:
1914 device_unregister(&rdev->dev);
1915clean:
1916 kfree(rdev);
1917 rdev = ERR_PTR(ret);
1918 goto out;
414c70cb
LG		 1919}
1920EXPORT_SYMBOL_GPL(regulator_register);
1921
1922/**
1923 * regulator_unregister - unregister regulator
69279fb9 1924 * @rdev: regulator to unregister
414c70cb
LG		 1925 *
1926 * Called by regulator drivers to unregister a regulator.
1927 */
1928void regulator_unregister(struct regulator_dev *rdev)
1929{
1930 if (rdev == NULL)
1931 return;
1932
1933 mutex_lock(&regulator_list_mutex);
1934 list_del(&rdev->list);
1935 if (rdev->supply)
1936 sysfs_remove_link(&rdev->dev.kobj, "supply");
1937 device_unregister(&rdev->dev);
1938 mutex_unlock(&regulator_list_mutex);
1939}
1940EXPORT_SYMBOL_GPL(regulator_unregister);
1941
414c70cb 1942/**
cf7bbcdf 1943 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 1944 * @state: system suspend state
1945 *
1946 * Configure each regulator with it's suspend operating parameters for state.
1947 * This will usually be called by machine suspend code prior to supending.
1948 */
1949int regulator_suspend_prepare(suspend_state_t state)
1950{
1951 struct regulator_dev *rdev;
1952 int ret = 0;
1953
1954 /* ON is handled by regulator active state */
1955 if (state == PM_SUSPEND_ON)
1956 return -EINVAL;
1957
1958 mutex_lock(&regulator_list_mutex);
1959 list_for_each_entry(rdev, &regulator_list, list) {
1960
1961 mutex_lock(&rdev->mutex);
1962 ret = suspend_prepare(rdev, state);
1963 mutex_unlock(&rdev->mutex);
1964
1965 if (ret < 0) {
1966 printk(KERN_ERR "%s: failed to prepare %s\n",
1967 __func__, rdev->desc->name);
1968 goto out;
1969 }
1970 }
1971out:
1972 mutex_unlock(&regulator_list_mutex);
1973 return ret;
1974}
1975EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
1976
1977/**
1978 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 1979 * @rdev: regulator
414c70cb
LG		 1980 *
1981 * Get rdev regulator driver private data. This call can be used in the
1982 * regulator driver context.
1983 */
1984void *rdev_get_drvdata(struct regulator_dev *rdev)
1985{
1986 return rdev->reg_data;
1987}
1988EXPORT_SYMBOL_GPL(rdev_get_drvdata);
1989
1990/**
1991 * regulator_get_drvdata - get regulator driver data
1992 * @regulator: regulator
1993 *
1994 * Get regulator driver private data. This call can be used in the consumer
1995 * driver context when non API regulator specific functions need to be called.
1996 */
1997void *regulator_get_drvdata(struct regulator *regulator)
1998{
1999 return regulator->rdev->reg_data;
2000}
2001EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2002
2003/**
2004 * regulator_set_drvdata - set regulator driver data
2005 * @regulator: regulator
2006 * @data: data
2007 */
2008void regulator_set_drvdata(struct regulator *regulator, void *data)
2009{
2010 regulator->rdev->reg_data = data;
2011}
2012EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2013
2014/**
2015 * regulator_get_id - get regulator ID
69279fb9 2016 * @rdev: regulator
414c70cb
LG		 2017 */
2018int rdev_get_id(struct regulator_dev *rdev)
2019{
2020 return rdev->desc->id;
2021}
2022EXPORT_SYMBOL_GPL(rdev_get_id);
2023
a5766f11
LG		 2024struct device *rdev_get_dev(struct regulator_dev *rdev)
2025{
2026 return &rdev->dev;
2027}
2028EXPORT_SYMBOL_GPL(rdev_get_dev);
2029
2030void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2031{
2032 return reg_init_data->driver_data;
2033}
2034EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2035
414c70cb
LG		 2036static int __init regulator_init(void)
2037{
2038 printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION);
2039 return class_register(&regulator_class);
2040}
2041
2042/* init early to allow our consumers to complete system booting */
2043core_initcall(regulator_init);
Linux kernel - Deliverables
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