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regulator: remove use of __devexit_p
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
1130e5b3 18#include <linux/debugfs.h>
414c70cb 19#include <linux/device.h>
5a0e3ad6 20#include <linux/slab.h>
f21e0e81 21#include <linux/async.h>
414c70cb
LG		 22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
31aae2be 25#include <linux/delay.h>
65f73508 26#include <linux/gpio.h>
69511a45 27#include <linux/of.h>
65b19ce6 28#include <linux/regmap.h>
69511a45 29#include <linux/regulator/of_regulator.h>
414c70cb
LG		 30#include <linux/regulator/consumer.h>
31#include <linux/regulator/driver.h>
32#include <linux/regulator/machine.h>
65602c32 33#include <linux/module.h>
414c70cb 34
02fa3ec0
MB		 35#define CREATE_TRACE_POINTS
36#include <trace/events/regulator.h>
37
34abbd68
MB		 38#include "dummy.h"
39
7d51a0db
MB		 40#define rdev_crit(rdev, fmt, ...) \
41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
5da84fd9
JP		 42#define rdev_err(rdev, fmt, ...) \
43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44#define rdev_warn(rdev, fmt, ...) \
45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_info(rdev, fmt, ...) \
47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_dbg(rdev, fmt, ...) \
49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50
414c70cb
LG		 51static DEFINE_MUTEX(regulator_list_mutex);
52static LIST_HEAD(regulator_list);
53static LIST_HEAD(regulator_map_list);
21cf891a 54static bool has_full_constraints;
688fe99a 55static bool board_wants_dummy_regulator;
414c70cb 56
1130e5b3 57static struct dentry *debugfs_root;
1130e5b3 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;
40f9244f 66 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 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;
6492bc1b 79 unsigned int always_on:1;
f59c8f9f 80 unsigned int bypass:1;
414c70cb
LG		 81 int uA_load;
82 int min_uV;
83 int max_uV;
414c70cb
LG		 84 char *supply_name;
85 struct device_attribute dev_attr;
86 struct regulator_dev *rdev;
5de70519 87 struct dentry *debugfs;
414c70cb
LG		 88};
89
90static int _regulator_is_enabled(struct regulator_dev *rdev);
3801b86a 91static int _regulator_disable(struct regulator_dev *rdev);
414c70cb
LG		 92static int _regulator_get_voltage(struct regulator_dev *rdev);
93static int _regulator_get_current_limit(struct regulator_dev *rdev);
94static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
95static void _notifier_call_chain(struct regulator_dev *rdev,
96 unsigned long event, void *data);
75790251
MB		 97static int _regulator_do_set_voltage(struct regulator_dev *rdev,
98 int min_uV, int max_uV);
3801b86a
MB		 99static struct regulator *create_regulator(struct regulator_dev *rdev,
100 struct device *dev,
101 const char *supply_name);
414c70cb 102
1083c393
MB		 103static const char *rdev_get_name(struct regulator_dev *rdev)
104{
105 if (rdev->constraints && rdev->constraints->name)
106 return rdev->constraints->name;
107 else if (rdev->desc->name)
108 return rdev->desc->name;
109 else
110 return "";
111}
112
69511a45
RN		 113/**
114 * of_get_regulator - get a regulator device node based on supply name
115 * @dev: Device pointer for the consumer (of regulator) device
116 * @supply: regulator supply name
117 *
118 * Extract the regulator device node corresponding to the supply name.
119 * retruns the device node corresponding to the regulator if found, else
120 * returns NULL.
121 */
122static struct device_node *of_get_regulator(struct device *dev, const char *supply)
123{
124 struct device_node *regnode = NULL;
125 char prop_name[32]; /* 32 is max size of property name */
126
127 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
128
129 snprintf(prop_name, 32, "%s-supply", supply);
130 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
131
132 if (!regnode) {
16fbcc3b 133 dev_dbg(dev, "Looking up %s property in node %s failed",
69511a45
RN		 134 prop_name, dev->of_node->full_name);
135 return NULL;
136 }
137 return regnode;
138}
139
6492bc1b
MB		 140static int _regulator_can_change_status(struct regulator_dev *rdev)
141{
142 if (!rdev->constraints)
143 return 0;
144
145 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
146 return 1;
147 else
148 return 0;
149}
150
414c70cb
LG		 151/* Platform voltage constraint check */
152static int regulator_check_voltage(struct regulator_dev *rdev,
153 int *min_uV, int *max_uV)
154{
155 BUG_ON(*min_uV > *max_uV);
156
157 if (!rdev->constraints) {
5da84fd9 158 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 159 return -ENODEV;
160 }
161 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
5da84fd9 162 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 163 return -EPERM;
164 }
165
166 if (*max_uV > rdev->constraints->max_uV)
167 *max_uV = rdev->constraints->max_uV;
168 if (*min_uV < rdev->constraints->min_uV)
169 *min_uV = rdev->constraints->min_uV;
170
89f425ed
MB		 171 if (*min_uV > *max_uV) {
172 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 173 *min_uV, *max_uV);
414c70cb 174 return -EINVAL;
89f425ed 175 }
414c70cb
LG		 176
177 return 0;
178}
179
05fda3b1
TP		 180/* Make sure we select a voltage that suits the needs of all
181 * regulator consumers
182 */
183static int regulator_check_consumers(struct regulator_dev *rdev,
184 int *min_uV, int *max_uV)
185{
186 struct regulator *regulator;
187
188 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4aa922c0
MB		 189 /*
190 * Assume consumers that didn't say anything are OK
191 * with anything in the constraint range.
192 */
193 if (!regulator->min_uV && !regulator->max_uV)
194 continue;
195
05fda3b1
TP		 196 if (*max_uV > regulator->max_uV)
197 *max_uV = regulator->max_uV;
198 if (*min_uV < regulator->min_uV)
199 *min_uV = regulator->min_uV;
200 }
201
202 if (*min_uV > *max_uV)
203 return -EINVAL;
204
205 return 0;
206}
207
414c70cb
LG		 208/* current constraint check */
209static int regulator_check_current_limit(struct regulator_dev *rdev,
210 int *min_uA, int *max_uA)
211{
212 BUG_ON(*min_uA > *max_uA);
213
214 if (!rdev->constraints) {
5da84fd9 215 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 216 return -ENODEV;
217 }
218 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
5da84fd9 219 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 220 return -EPERM;
221 }
222
223 if (*max_uA > rdev->constraints->max_uA)
224 *max_uA = rdev->constraints->max_uA;
225 if (*min_uA < rdev->constraints->min_uA)
226 *min_uA = rdev->constraints->min_uA;
227
89f425ed
MB		 228 if (*min_uA > *max_uA) {
229 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 230 *min_uA, *max_uA);
414c70cb 231 return -EINVAL;
89f425ed 232 }
414c70cb
LG		 233
234 return 0;
235}
236
237/* operating mode constraint check */
2c608234 238static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 239{
2c608234 240 switch (*mode) {
e573520b
DB		 241 case REGULATOR_MODE_FAST:
242 case REGULATOR_MODE_NORMAL:
243 case REGULATOR_MODE_IDLE:
244 case REGULATOR_MODE_STANDBY:
245 break;
246 default:
89f425ed 247 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 248 return -EINVAL;
249 }
250
414c70cb 251 if (!rdev->constraints) {
5da84fd9 252 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 253 return -ENODEV;
254 }
255 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
5da84fd9 256 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 257 return -EPERM;
258 }
2c608234
MB		 259
260 /* The modes are bitmasks, the most power hungry modes having
261 * the lowest values. If the requested mode isn't supported
262 * try higher modes. */
263 while (*mode) {
264 if (rdev->constraints->valid_modes_mask & *mode)
265 return 0;
266 *mode /= 2;
414c70cb 267 }
2c608234
MB		 268
269 return -EINVAL;
414c70cb
LG		 270}
271
272/* dynamic regulator mode switching constraint check */
273static int regulator_check_drms(struct regulator_dev *rdev)
274{
275 if (!rdev->constraints) {
5da84fd9 276 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 277 return -ENODEV;
278 }
279 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
5da84fd9 280 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 281 return -EPERM;
282 }
283 return 0;
284}
285
414c70cb
LG		 286static ssize_t regulator_uV_show(struct device *dev,
287 struct device_attribute *attr, char *buf)
288{
a5766f11 289 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 290 ssize_t ret;
291
292 mutex_lock(&rdev->mutex);
293 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
294 mutex_unlock(&rdev->mutex);
295
296 return ret;
297}
7ad68e2f 298static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 299
300static ssize_t regulator_uA_show(struct device *dev,
301 struct device_attribute *attr, char *buf)
302{
a5766f11 303 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 304
305 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
306}
7ad68e2f 307static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 308
bc558a60
MB		 309static ssize_t regulator_name_show(struct device *dev,
310 struct device_attribute *attr, char *buf)
311{
312 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 313
1083c393 314 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60
MB		 315}
316
4fca9545 317static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 318{
414c70cb
LG		 319 switch (mode) {
320 case REGULATOR_MODE_FAST:
321 return sprintf(buf, "fast\n");
322 case REGULATOR_MODE_NORMAL:
323 return sprintf(buf, "normal\n");
324 case REGULATOR_MODE_IDLE:
325 return sprintf(buf, "idle\n");
326 case REGULATOR_MODE_STANDBY:
327 return sprintf(buf, "standby\n");
328 }
329 return sprintf(buf, "unknown\n");
330}
331
4fca9545
DB		 332static ssize_t regulator_opmode_show(struct device *dev,
333 struct device_attribute *attr, char *buf)
414c70cb 334{
a5766f11 335 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 336
4fca9545
DB		 337 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
338}
7ad68e2f 339static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 340
341static ssize_t regulator_print_state(char *buf, int state)
342{
414c70cb
LG		 343 if (state > 0)
344 return sprintf(buf, "enabled\n");
345 else if (state == 0)
346 return sprintf(buf, "disabled\n");
347 else
348 return sprintf(buf, "unknown\n");
349}
350
4fca9545
DB		 351static ssize_t regulator_state_show(struct device *dev,
352 struct device_attribute *attr, char *buf)
353{
354 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 355 ssize_t ret;
356
357 mutex_lock(&rdev->mutex);
358 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
359 mutex_unlock(&rdev->mutex);
4fca9545 360
9332546f 361 return ret;
4fca9545 362}
7ad68e2f 363static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 364
853116a1
DB		 365static ssize_t regulator_status_show(struct device *dev,
366 struct device_attribute *attr, char *buf)
367{
368 struct regulator_dev *rdev = dev_get_drvdata(dev);
369 int status;
370 char *label;
371
372 status = rdev->desc->ops->get_status(rdev);
373 if (status < 0)
374 return status;
375
376 switch (status) {
377 case REGULATOR_STATUS_OFF:
378 label = "off";
379 break;
380 case REGULATOR_STATUS_ON:
381 label = "on";
382 break;
383 case REGULATOR_STATUS_ERROR:
384 label = "error";
385 break;
386 case REGULATOR_STATUS_FAST:
387 label = "fast";
388 break;
389 case REGULATOR_STATUS_NORMAL:
390 label = "normal";
391 break;
392 case REGULATOR_STATUS_IDLE:
393 label = "idle";
394 break;
395 case REGULATOR_STATUS_STANDBY:
396 label = "standby";
397 break;
f59c8f9f
MB		 398 case REGULATOR_STATUS_BYPASS:
399 label = "bypass";
400 break;
1beaf762
KG		 401 case REGULATOR_STATUS_UNDEFINED:
402 label = "undefined";
403 break;
853116a1
DB		 404 default:
405 return -ERANGE;
406 }
407
408 return sprintf(buf, "%s\n", label);
409}
410static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
411
414c70cb
LG		 412static ssize_t regulator_min_uA_show(struct device *dev,
413 struct device_attribute *attr, char *buf)
414{
a5766f11 415 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 416
417 if (!rdev->constraints)
418 return sprintf(buf, "constraint not defined\n");
419
420 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
421}
7ad68e2f 422static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 423
424static ssize_t regulator_max_uA_show(struct device *dev,
425 struct device_attribute *attr, char *buf)
426{
a5766f11 427 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 428
429 if (!rdev->constraints)
430 return sprintf(buf, "constraint not defined\n");
431
432 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
433}
7ad68e2f 434static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 435
436static ssize_t regulator_min_uV_show(struct device *dev,
437 struct device_attribute *attr, char *buf)
438{
a5766f11 439 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 440
441 if (!rdev->constraints)
442 return sprintf(buf, "constraint not defined\n");
443
444 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
445}
7ad68e2f 446static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 447
448static ssize_t regulator_max_uV_show(struct device *dev,
449 struct device_attribute *attr, char *buf)
450{
a5766f11 451 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 452
453 if (!rdev->constraints)
454 return sprintf(buf, "constraint not defined\n");
455
456 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
457}
7ad68e2f 458static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 459
460static ssize_t regulator_total_uA_show(struct device *dev,
461 struct device_attribute *attr, char *buf)
462{
a5766f11 463 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 464 struct regulator *regulator;
465 int uA = 0;
466
467 mutex_lock(&rdev->mutex);
468 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 469 uA += regulator->uA_load;
414c70cb
LG		 470 mutex_unlock(&rdev->mutex);
471 return sprintf(buf, "%d\n", uA);
472}
7ad68e2f 473static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb
LG		 474
475static ssize_t regulator_num_users_show(struct device *dev,
476 struct device_attribute *attr, char *buf)
477{
a5766f11 478 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 479 return sprintf(buf, "%d\n", rdev->use_count);
480}
481
482static ssize_t regulator_type_show(struct device *dev,
483 struct device_attribute *attr, char *buf)
484{
a5766f11 485 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 486
487 switch (rdev->desc->type) {
488 case REGULATOR_VOLTAGE:
489 return sprintf(buf, "voltage\n");
490 case REGULATOR_CURRENT:
491 return sprintf(buf, "current\n");
492 }
493 return sprintf(buf, "unknown\n");
494}
495
496static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
497 struct device_attribute *attr, char *buf)
498{
a5766f11 499 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 500
414c70cb
LG		 501 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
502}
7ad68e2f
DB		 503static DEVICE_ATTR(suspend_mem_microvolts, 0444,
504 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 505
506static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
507 struct device_attribute *attr, char *buf)
508{
a5766f11 509 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 510
414c70cb
LG		 511 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
512}
7ad68e2f
DB		 513static DEVICE_ATTR(suspend_disk_microvolts, 0444,
514 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 515
516static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
517 struct device_attribute *attr, char *buf)
518{
a5766f11 519 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 520
414c70cb
LG		 521 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
522}
7ad68e2f
DB		 523static DEVICE_ATTR(suspend_standby_microvolts, 0444,
524 regulator_suspend_standby_uV_show, NULL);
414c70cb 525
414c70cb
LG		 526static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
527 struct device_attribute *attr, char *buf)
528{
a5766f11 529 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 530
4fca9545
DB		 531 return regulator_print_opmode(buf,
532 rdev->constraints->state_mem.mode);
414c70cb 533}
7ad68e2f
DB		 534static DEVICE_ATTR(suspend_mem_mode, 0444,
535 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 536
537static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
538 struct device_attribute *attr, char *buf)
539{
a5766f11 540 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 541
4fca9545
DB		 542 return regulator_print_opmode(buf,
543 rdev->constraints->state_disk.mode);
414c70cb 544}
7ad68e2f
DB		 545static DEVICE_ATTR(suspend_disk_mode, 0444,
546 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 547
548static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
549 struct device_attribute *attr, char *buf)
550{
a5766f11 551 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 552
4fca9545
DB		 553 return regulator_print_opmode(buf,
554 rdev->constraints->state_standby.mode);
414c70cb 555}
7ad68e2f
DB		 556static DEVICE_ATTR(suspend_standby_mode, 0444,
557 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 558
559static ssize_t regulator_suspend_mem_state_show(struct device *dev,
560 struct device_attribute *attr, char *buf)
561{
a5766f11 562 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 563
4fca9545
DB		 564 return regulator_print_state(buf,
565 rdev->constraints->state_mem.enabled);
414c70cb 566}
7ad68e2f
DB		 567static DEVICE_ATTR(suspend_mem_state, 0444,
568 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 569
570static ssize_t regulator_suspend_disk_state_show(struct device *dev,
571 struct device_attribute *attr, char *buf)
572{
a5766f11 573 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 574
4fca9545
DB		 575 return regulator_print_state(buf,
576 rdev->constraints->state_disk.enabled);
414c70cb 577}
7ad68e2f
DB		 578static DEVICE_ATTR(suspend_disk_state, 0444,
579 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 580
581static ssize_t regulator_suspend_standby_state_show(struct device *dev,
582 struct device_attribute *attr, char *buf)
583{
a5766f11 584 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 585
4fca9545
DB		 586 return regulator_print_state(buf,
587 rdev->constraints->state_standby.enabled);
414c70cb 588}
7ad68e2f
DB		 589static DEVICE_ATTR(suspend_standby_state, 0444,
590 regulator_suspend_standby_state_show, NULL);
591
f59c8f9f
MB		 592static ssize_t regulator_bypass_show(struct device *dev,
593 struct device_attribute *attr, char *buf)
594{
595 struct regulator_dev *rdev = dev_get_drvdata(dev);
596 const char *report;
597 bool bypass;
598 int ret;
599
600 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
601
602 if (ret != 0)
603 report = "unknown";
604 else if (bypass)
605 report = "enabled";
606 else
607 report = "disabled";
608
609 return sprintf(buf, "%s\n", report);
610}
611static DEVICE_ATTR(bypass, 0444,
612 regulator_bypass_show, NULL);
bc558a60 613
7ad68e2f
DB		 614/*
615 * These are the only attributes are present for all regulators.
616 * Other attributes are a function of regulator functionality.
617 */
414c70cb 618static struct device_attribute regulator_dev_attrs[] = {
bc558a60 619 __ATTR(name, 0444, regulator_name_show, NULL),
414c70cb
LG		 620 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
621 __ATTR(type, 0444, regulator_type_show, NULL),
414c70cb
LG		 622 __ATTR_NULL,
623};
624
625static void regulator_dev_release(struct device *dev)
626{
a5766f11 627 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 628 kfree(rdev);
629}
630
631static struct class regulator_class = {
632 .name = "regulator",
633 .dev_release = regulator_dev_release,
634 .dev_attrs = regulator_dev_attrs,
635};
636
637/* Calculate the new optimum regulator operating mode based on the new total
638 * consumer load. All locks held by caller */
639static void drms_uA_update(struct regulator_dev *rdev)
640{
641 struct regulator *sibling;
642 int current_uA = 0, output_uV, input_uV, err;
643 unsigned int mode;
644
645 err = regulator_check_drms(rdev);
646 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
476c2d83
MB		 647 (!rdev->desc->ops->get_voltage &&
648 !rdev->desc->ops->get_voltage_sel) ||
649 !rdev->desc->ops->set_mode)
036de8ef 650 return;
414c70cb
LG		 651
652 /* get output voltage */
1bf5a1f8 653 output_uV = _regulator_get_voltage(rdev);
414c70cb
LG		 654 if (output_uV <= 0)
655 return;
656
657 /* get input voltage */
1bf5a1f8
MB		 658 input_uV = 0;
659 if (rdev->supply)
3f24f5ad 660 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 661 if (input_uV <= 0)
414c70cb
LG		 662 input_uV = rdev->constraints->input_uV;
663 if (input_uV <= 0)
664 return;
665
666 /* calc total requested load */
667 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 668 current_uA += sibling->uA_load;
414c70cb
LG		 669
670 /* now get the optimum mode for our new total regulator load */
671 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
672 output_uV, current_uA);
673
674 /* check the new mode is allowed */
2c608234 675 err = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 676 if (err == 0)
677 rdev->desc->ops->set_mode(rdev, mode);
678}
679
680static int suspend_set_state(struct regulator_dev *rdev,
681 struct regulator_state *rstate)
682{
683 int ret = 0;
638f85c5
MB		 684
685 /* If we have no suspend mode configration don't set anything;
8ac0e95d
AL		 686 * only warn if the driver implements set_suspend_voltage or
687 * set_suspend_mode callback.
638f85c5
MB		 688 */
689 if (!rstate->enabled && !rstate->disabled) {
8ac0e95d
AL		 690 if (rdev->desc->ops->set_suspend_voltage ||
691 rdev->desc->ops->set_suspend_mode)
5da84fd9 692 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 693 return 0;
694 }
695
696 if (rstate->enabled && rstate->disabled) {
5da84fd9 697 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 698 return -EINVAL;
699 }
414c70cb 700
8ac0e95d 701 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
414c70cb 702 ret = rdev->desc->ops->set_suspend_enable(rdev);
8ac0e95d 703 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
414c70cb 704 ret = rdev->desc->ops->set_suspend_disable(rdev);
8ac0e95d
AL		 705 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
706 ret = 0;
707
414c70cb 708 if (ret < 0) {
5da84fd9 709 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 710 return ret;
711 }
712
713 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
714 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
715 if (ret < 0) {
5da84fd9 716 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 717 return ret;
718 }
719 }
720
721 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
722 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
723 if (ret < 0) {
5da84fd9 724 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 725 return ret;
726 }
727 }
728 return ret;
729}
730
731/* locks held by caller */
732static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
733{
734 if (!rdev->constraints)
735 return -EINVAL;
736
737 switch (state) {
738 case PM_SUSPEND_STANDBY:
739 return suspend_set_state(rdev,
740 &rdev->constraints->state_standby);
741 case PM_SUSPEND_MEM:
742 return suspend_set_state(rdev,
743 &rdev->constraints->state_mem);
744 case PM_SUSPEND_MAX:
745 return suspend_set_state(rdev,
746 &rdev->constraints->state_disk);
747 default:
748 return -EINVAL;
749 }
750}
751
752static void print_constraints(struct regulator_dev *rdev)
753{
754 struct regulation_constraints *constraints = rdev->constraints;
973e9a27 755 char buf[80] = "";
8f031b48
MB		 756 int count = 0;
757 int ret;
414c70cb 758
8f031b48 759 if (constraints->min_uV && constraints->max_uV) {
414c70cb 760 if (constraints->min_uV == constraints->max_uV)
8f031b48
MB		 761 count += sprintf(buf + count, "%d mV ",
762 constraints->min_uV / 1000);
414c70cb 763 else
8f031b48
MB		 764 count += sprintf(buf + count, "%d <--> %d mV ",
765 constraints->min_uV / 1000,
766 constraints->max_uV / 1000);
767 }
768
769 if (!constraints->min_uV ||
770 constraints->min_uV != constraints->max_uV) {
771 ret = _regulator_get_voltage(rdev);
772 if (ret > 0)
773 count += sprintf(buf + count, "at %d mV ", ret / 1000);
774 }
775
bf5892a8
MB		 776 if (constraints->uV_offset)
777 count += sprintf(buf, "%dmV offset ",
778 constraints->uV_offset / 1000);
779
8f031b48 780 if (constraints->min_uA && constraints->max_uA) {
414c70cb 781 if (constraints->min_uA == constraints->max_uA)
8f031b48
MB		 782 count += sprintf(buf + count, "%d mA ",
783 constraints->min_uA / 1000);
414c70cb 784 else
8f031b48
MB		 785 count += sprintf(buf + count, "%d <--> %d mA ",
786 constraints->min_uA / 1000,
787 constraints->max_uA / 1000);
788 }
789
790 if (!constraints->min_uA ||
791 constraints->min_uA != constraints->max_uA) {
792 ret = _regulator_get_current_limit(rdev);
793 if (ret > 0)
e4a6376b 794 count += sprintf(buf + count, "at %d mA ", ret / 1000);
414c70cb 795 }
8f031b48 796
414c70cb
LG		 797 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
798 count += sprintf(buf + count, "fast ");
799 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
800 count += sprintf(buf + count, "normal ");
801 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
802 count += sprintf(buf + count, "idle ");
803 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
804 count += sprintf(buf + count, "standby");
805
215b8b05
UKK		 806 if (!count)
807 sprintf(buf, "no parameters");
808
13ce29f8 809 rdev_info(rdev, "%s\n", buf);
4a682922
MB		 810
811 if ((constraints->min_uV != constraints->max_uV) &&
812 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
813 rdev_warn(rdev,
814 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 815}
816
e79055d6 817static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 818 struct regulation_constraints *constraints)
a5766f11 819{
e5fda26c 820 struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 821 int ret;
822
823 /* do we need to apply the constraint voltage */
824 if (rdev->constraints->apply_uV &&
75790251
MB		 825 rdev->constraints->min_uV == rdev->constraints->max_uV) {
826 ret = _regulator_do_set_voltage(rdev,
827 rdev->constraints->min_uV,
828 rdev->constraints->max_uV);
829 if (ret < 0) {
830 rdev_err(rdev, "failed to apply %duV constraint\n",
831 rdev->constraints->min_uV);
75790251
MB		 832 return ret;
833 }
af5866c9 834 }
e06f5b4f 835
4367cfdc
DB		 836 /* constrain machine-level voltage specs to fit
837 * the actual range supported by this regulator.
838 */
839 if (ops->list_voltage && rdev->desc->n_voltages) {
840 int count = rdev->desc->n_voltages;
841 int i;
842 int min_uV = INT_MAX;
843 int max_uV = INT_MIN;
844 int cmin = constraints->min_uV;
845 int cmax = constraints->max_uV;
846
3e590918
MB		 847 /* it's safe to autoconfigure fixed-voltage supplies
848 and the constraints are used by list_voltage. */
4367cfdc 849 if (count == 1 && !cmin) {
3e590918 850 cmin = 1;
4367cfdc 851 cmax = INT_MAX;
3e590918
MB		 852 constraints->min_uV = cmin;
853 constraints->max_uV = cmax;
4367cfdc
DB		 854 }
855
3e2b9abd
MB		 856 /* voltage constraints are optional */
857 if ((cmin == 0) && (cmax == 0))
e79055d6 858 return 0;
3e2b9abd 859
4367cfdc 860 /* else require explicit machine-level constraints */
3e2b9abd 861 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 862 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 863 return -EINVAL;
4367cfdc
DB		 864 }
865
866 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
867 for (i = 0; i < count; i++) {
868 int value;
869
870 value = ops->list_voltage(rdev, i);
871 if (value <= 0)
872 continue;
873
874 /* maybe adjust [min_uV..max_uV] */
875 if (value >= cmin && value < min_uV)
876 min_uV = value;
877 if (value <= cmax && value > max_uV)
878 max_uV = value;
879 }
880
881 /* final: [min_uV..max_uV] valid iff constraints valid */
882 if (max_uV < min_uV) {
5da84fd9 883 rdev_err(rdev, "unsupportable voltage constraints\n");
e79055d6 884 return -EINVAL;
4367cfdc
DB		 885 }
886
887 /* use regulator's subset of machine constraints */
888 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 889 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
890 constraints->min_uV, min_uV);
4367cfdc
DB		 891 constraints->min_uV = min_uV;
892 }
893 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 894 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
895 constraints->max_uV, max_uV);
4367cfdc
DB		 896 constraints->max_uV = max_uV;
897 }
898 }
899
e79055d6
MB		 900 return 0;
901}
902
903/**
904 * set_machine_constraints - sets regulator constraints
905 * @rdev: regulator source
906 * @constraints: constraints to apply
907 *
908 * Allows platform initialisation code to define and constrain
909 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
910 * Constraints *must* be set by platform code in order for some
911 * regulator operations to proceed i.e. set_voltage, set_current_limit,
912 * set_mode.
913 */
914static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 915 const struct regulation_constraints *constraints)
e79055d6
MB		 916{
917 int ret = 0;
e79055d6
MB		 918 struct regulator_ops *ops = rdev->desc->ops;
919
9a8f5e07
MB		 920 if (constraints)
921 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
922 GFP_KERNEL);
923 else
924 rdev->constraints = kzalloc(sizeof(*constraints),
925 GFP_KERNEL);
f8c12fe3
MB		 926 if (!rdev->constraints)
927 return -ENOMEM;
af5866c9 928
f8c12fe3 929 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6
MB		 930 if (ret != 0)
931 goto out;
932
a5766f11 933 /* do we need to setup our suspend state */
9a8f5e07 934 if (rdev->constraints->initial_state) {
f8c12fe3 935 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 936 if (ret < 0) {
5da84fd9 937 rdev_err(rdev, "failed to set suspend state\n");
e06f5b4f
MB		 938 goto out;
939 }
940 }
a5766f11 941
9a8f5e07 942 if (rdev->constraints->initial_mode) {
a308466c 943 if (!ops->set_mode) {
5da84fd9 944 rdev_err(rdev, "no set_mode operation\n");
a308466c
MB		 945 ret = -EINVAL;
946 goto out;
947 }
948
f8c12fe3 949 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 950 if (ret < 0) {
5da84fd9 951 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
a308466c
MB		 952 goto out;
953 }
954 }
955
cacf90f2
MB		 956 /* If the constraints say the regulator should be on at this point
957 * and we have control then make sure it is enabled.
958 */
f8c12fe3
MB		 959 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
960 ops->enable) {
e5fda26c
MB		 961 ret = ops->enable(rdev);
962 if (ret < 0) {
5da84fd9 963 rdev_err(rdev, "failed to enable\n");
e5fda26c
MB		 964 goto out;
965 }
966 }
967
6f0b2c69
YSB		 968 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) {
969 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
970 if (ret < 0) {
971 rdev_err(rdev, "failed to set ramp_delay\n");
972 goto out;
973 }
974 }
975
a5766f11 976 print_constraints(rdev);
1a6958e7 977 return 0;
a5766f11 978out:
1a6958e7
AL		 979 kfree(rdev->constraints);
980 rdev->constraints = NULL;
a5766f11
LG		 981 return ret;
982}
983
984/**
985 * set_supply - set regulator supply regulator
69279fb9
MB		 986 * @rdev: regulator name
987 * @supply_rdev: supply regulator name
a5766f11
LG		 988 *
989 * Called by platform initialisation code to set the supply regulator for this
990 * regulator. This ensures that a regulators supply will also be enabled by the
991 * core if it's child is enabled.
992 */
993static int set_supply(struct regulator_dev *rdev,
3801b86a 994 struct regulator_dev *supply_rdev)
a5766f11
LG		 995{
996 int err;
997
3801b86a
MB		 998 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
999
1000 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 1001 if (rdev->supply == NULL) {
1002 err = -ENOMEM;
3801b86a 1003 return err;
a5766f11 1004 }
57ad526a 1005 supply_rdev->open_count++;
3801b86a
MB		 1006
1007 return 0;
a5766f11
LG		 1008}
1009
1010/**
06c63f93 1011 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 1012 * @rdev: regulator source
40f9244f 1013 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 1014 * @supply: symbolic name for supply
a5766f11
LG		 1015 *
1016 * Allows platform initialisation code to map physical regulator
1017 * sources to symbolic names for supplies for use by devices. Devices
1018 * should use these symbolic names to request regulators, avoiding the
1019 * need to provide board-specific regulator names as platform data.
1020 */
1021static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 1022 const char *consumer_dev_name,
1023 const char *supply)
a5766f11
LG		 1024{
1025 struct regulator_map *node;
9ed2099e 1026 int has_dev;
a5766f11
LG		 1027
1028 if (supply == NULL)
1029 return -EINVAL;
1030
9ed2099e
MB		 1031 if (consumer_dev_name != NULL)
1032 has_dev = 1;
1033 else
1034 has_dev = 0;
1035
6001e13c 1036 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1037 if (node->dev_name && consumer_dev_name) {
1038 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1039 continue;
1040 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1041 continue;
23b5cc2a
JN		 1042 }
1043
6001e13c
DB		 1044 if (strcmp(node->supply, supply) != 0)
1045 continue;
1046
737f360d
MB		 1047 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1048 consumer_dev_name,
1049 dev_name(&node->regulator->dev),
1050 node->regulator->desc->name,
1051 supply,
1052 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 1053 return -EBUSY;
1054 }
1055
9ed2099e 1056 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 1057 if (node == NULL)
1058 return -ENOMEM;
1059
1060 node->regulator = rdev;
a5766f11
LG		 1061 node->supply = supply;
1062
9ed2099e
MB		 1063 if (has_dev) {
1064 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1065 if (node->dev_name == NULL) {
1066 kfree(node);
1067 return -ENOMEM;
1068 }
40f9244f
MB		 1069 }
1070
a5766f11
LG		 1071 list_add(&node->list, &regulator_map_list);
1072 return 0;
1073}
1074
0f1d747b
MR		 1075static void unset_regulator_supplies(struct regulator_dev *rdev)
1076{
1077 struct regulator_map *node, *n;
1078
1079 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1080 if (rdev == node->regulator) {
1081 list_del(&node->list);
40f9244f 1082 kfree(node->dev_name);
0f1d747b 1083 kfree(node);
0f1d747b
MR		 1084 }
1085 }
1086}
1087
f5726ae3 1088#define REG_STR_SIZE 64
414c70cb
LG		 1089
1090static struct regulator *create_regulator(struct regulator_dev *rdev,
1091 struct device *dev,
1092 const char *supply_name)
1093{
1094 struct regulator *regulator;
1095 char buf[REG_STR_SIZE];
1096 int err, size;
1097
1098 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1099 if (regulator == NULL)
1100 return NULL;
1101
1102 mutex_lock(&rdev->mutex);
1103 regulator->rdev = rdev;
1104 list_add(&regulator->list, &rdev->consumer_list);
1105
1106 if (dev) {
e2c98eaf
SG		 1107 regulator->dev = dev;
1108
222cc7b1 1109 /* Add a link to the device sysfs entry */
414c70cb
LG		 1110 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1111 dev->kobj.name, supply_name);
1112 if (size >= REG_STR_SIZE)
222cc7b1 1113 goto overflow_err;
414c70cb
LG		 1114
1115 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1116 if (regulator->supply_name == NULL)
222cc7b1 1117 goto overflow_err;
414c70cb
LG		 1118
1119 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1120 buf);
1121 if (err) {
5da84fd9
JP		 1122 rdev_warn(rdev, "could not add device link %s err %d\n",
1123 dev->kobj.name, err);
222cc7b1 1124 /* non-fatal */
414c70cb 1125 }
5de70519
MB		 1126 } else {
1127 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1128 if (regulator->supply_name == NULL)
222cc7b1 1129 goto overflow_err;
5de70519
MB		 1130 }
1131
5de70519
MB		 1132 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1133 rdev->debugfs);
24751434 1134 if (!regulator->debugfs) {
5de70519 1135 rdev_warn(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1136 } else {
1137 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1138 &regulator->uA_load);
1139 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1140 &regulator->min_uV);
1141 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1142 &regulator->max_uV);
414c70cb 1143 }
5de70519 1144
6492bc1b
MB		 1145 /*
1146 * Check now if the regulator is an always on regulator - if
1147 * it is then we don't need to do nearly so much work for
1148 * enable/disable calls.
1149 */
1150 if (!_regulator_can_change_status(rdev) &&
1151 _regulator_is_enabled(rdev))
1152 regulator->always_on = true;
1153
414c70cb
LG		 1154 mutex_unlock(&rdev->mutex);
1155 return regulator;
414c70cb
LG		 1156overflow_err:
1157 list_del(&regulator->list);
1158 kfree(regulator);
1159 mutex_unlock(&rdev->mutex);
1160 return NULL;
1161}
1162
31aae2be
MB		 1163static int _regulator_get_enable_time(struct regulator_dev *rdev)
1164{
1165 if (!rdev->desc->ops->enable_time)
79511ed3 1166 return rdev->desc->enable_time;
31aae2be
MB		 1167 return rdev->desc->ops->enable_time(rdev);
1168}
1169
69511a45 1170static struct regulator_dev *regulator_dev_lookup(struct device *dev,
6d191a5f
MB		 1171 const char *supply,
1172 int *ret)
69511a45
RN		 1173{
1174 struct regulator_dev *r;
1175 struct device_node *node;
576ca436
MB		 1176 struct regulator_map *map;
1177 const char *devname = NULL;
69511a45
RN		 1178
1179 /* first do a dt based lookup */
1180 if (dev && dev->of_node) {
1181 node = of_get_regulator(dev, supply);
6d191a5f 1182 if (node) {
69511a45
RN		 1183 list_for_each_entry(r, &regulator_list, list)
1184 if (r->dev.parent &&
1185 node == r->dev.of_node)
1186 return r;
6d191a5f
MB		 1187 } else {
1188 /*
1189 * If we couldn't even get the node then it's
1190 * not just that the device didn't register
1191 * yet, there's no node and we'll never
1192 * succeed.
1193 */
1194 *ret = -ENODEV;
1195 }
69511a45
RN		 1196 }
1197
1198 /* if not found, try doing it non-dt way */
576ca436
MB		 1199 if (dev)
1200 devname = dev_name(dev);
1201
69511a45
RN		 1202 list_for_each_entry(r, &regulator_list, list)
1203 if (strcmp(rdev_get_name(r), supply) == 0)
1204 return r;
1205
576ca436
MB		 1206 list_for_each_entry(map, &regulator_map_list, list) {
1207 /* If the mapping has a device set up it must match */
1208 if (map->dev_name &&
1209 (!devname || strcmp(map->dev_name, devname)))
1210 continue;
1211
1212 if (strcmp(map->supply, supply) == 0)
1213 return map->regulator;
1214 }
1215
1216
69511a45
RN		 1217 return NULL;
1218}
1219
5ffbd136
MB		 1220/* Internal regulator request function */
1221static struct regulator *_regulator_get(struct device *dev, const char *id,
1222 int exclusive)
414c70cb
LG		 1223{
1224 struct regulator_dev *rdev;
04bf3011 1225 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
40f9244f 1226 const char *devname = NULL;
5ffbd136 1227 int ret;
414c70cb
LG		 1228
1229 if (id == NULL) {
5da84fd9 1230 pr_err("get() with no identifier\n");
414c70cb
LG		 1231 return regulator;
1232 }
1233
40f9244f
MB		 1234 if (dev)
1235 devname = dev_name(dev);
1236
414c70cb
LG		 1237 mutex_lock(&regulator_list_mutex);
1238
6d191a5f 1239 rdev = regulator_dev_lookup(dev, id, &ret);
69511a45
RN		 1240 if (rdev)
1241 goto found;
1242
688fe99a
MB		 1243 if (board_wants_dummy_regulator) {
1244 rdev = dummy_regulator_rdev;
1245 goto found;
1246 }
1247
34abbd68
MB		 1248#ifdef CONFIG_REGULATOR_DUMMY
1249 if (!devname)
1250 devname = "deviceless";
1251
1252 /* If the board didn't flag that it was fully constrained then
1253 * substitute in a dummy regulator so consumers can continue.
1254 */
1255 if (!has_full_constraints) {
5da84fd9
JP		 1256 pr_warn("%s supply %s not found, using dummy regulator\n",
1257 devname, id);
34abbd68
MB		 1258 rdev = dummy_regulator_rdev;
1259 goto found;
1260 }
1261#endif
1262
414c70cb
LG		 1263 mutex_unlock(&regulator_list_mutex);
1264 return regulator;
1265
1266found:
5ffbd136
MB		 1267 if (rdev->exclusive) {
1268 regulator = ERR_PTR(-EPERM);
1269 goto out;
1270 }
1271
1272 if (exclusive && rdev->open_count) {
1273 regulator = ERR_PTR(-EBUSY);
1274 goto out;
1275 }
1276
a5766f11
LG		 1277 if (!try_module_get(rdev->owner))
1278 goto out;
1279
414c70cb
LG		 1280 regulator = create_regulator(rdev, dev, id);
1281 if (regulator == NULL) {
1282 regulator = ERR_PTR(-ENOMEM);
1283 module_put(rdev->owner);
bcda4321 1284 goto out;
414c70cb
LG		 1285 }
1286
5ffbd136
MB		 1287 rdev->open_count++;
1288 if (exclusive) {
1289 rdev->exclusive = 1;
1290
1291 ret = _regulator_is_enabled(rdev);
1292 if (ret > 0)
1293 rdev->use_count = 1;
1294 else
1295 rdev->use_count = 0;
1296 }
1297
a5766f11 1298out:
414c70cb 1299 mutex_unlock(&regulator_list_mutex);
5ffbd136 1300
414c70cb
LG		 1301 return regulator;
1302}
5ffbd136
MB		 1303
1304/**
1305 * regulator_get - lookup and obtain a reference to a regulator.
1306 * @dev: device for regulator "consumer"
1307 * @id: Supply name or regulator ID.
1308 *
1309 * Returns a struct regulator corresponding to the regulator producer,
1310 * or IS_ERR() condition containing errno.
1311 *
1312 * Use of supply names configured via regulator_set_device_supply() is
1313 * strongly encouraged. It is recommended that the supply name used
1314 * should match the name used for the supply and/or the relevant
1315 * device pins in the datasheet.
1316 */
1317struct regulator *regulator_get(struct device *dev, const char *id)
1318{
1319 return _regulator_get(dev, id, 0);
1320}
414c70cb
LG		 1321EXPORT_SYMBOL_GPL(regulator_get);
1322
070b9079
SB		 1323static void devm_regulator_release(struct device *dev, void *res)
1324{
1325 regulator_put(*(struct regulator **)res);
1326}
1327
1328/**
1329 * devm_regulator_get - Resource managed regulator_get()
1330 * @dev: device for regulator "consumer"
1331 * @id: Supply name or regulator ID.
1332 *
1333 * Managed regulator_get(). Regulators returned from this function are
1334 * automatically regulator_put() on driver detach. See regulator_get() for more
1335 * information.
1336 */
1337struct regulator *devm_regulator_get(struct device *dev, const char *id)
1338{
1339 struct regulator **ptr, *regulator;
1340
1341 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1342 if (!ptr)
1343 return ERR_PTR(-ENOMEM);
1344
1345 regulator = regulator_get(dev, id);
1346 if (!IS_ERR(regulator)) {
1347 *ptr = regulator;
1348 devres_add(dev, ptr);
1349 } else {
1350 devres_free(ptr);
1351 }
1352
1353 return regulator;
1354}
1355EXPORT_SYMBOL_GPL(devm_regulator_get);
1356
5ffbd136
MB		 1357/**
1358 * regulator_get_exclusive - obtain exclusive access to a regulator.
1359 * @dev: device for regulator "consumer"
1360 * @id: Supply name or regulator ID.
1361 *
1362 * Returns a struct regulator corresponding to the regulator producer,
1363 * or IS_ERR() condition containing errno. Other consumers will be
1364 * unable to obtain this reference is held and the use count for the
1365 * regulator will be initialised to reflect the current state of the
1366 * regulator.
1367 *
1368 * This is intended for use by consumers which cannot tolerate shared
1369 * use of the regulator such as those which need to force the
1370 * regulator off for correct operation of the hardware they are
1371 * controlling.
1372 *
1373 * Use of supply names configured via regulator_set_device_supply() is
1374 * strongly encouraged. It is recommended that the supply name used
1375 * should match the name used for the supply and/or the relevant
1376 * device pins in the datasheet.
1377 */
1378struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1379{
1380 return _regulator_get(dev, id, 1);
1381}
1382EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1383
23ff2f0f
CK		 1384/* Locks held by regulator_put() */
1385static void _regulator_put(struct regulator *regulator)
414c70cb
LG		 1386{
1387 struct regulator_dev *rdev;
1388
1389 if (regulator == NULL || IS_ERR(regulator))
1390 return;
1391
414c70cb
LG		 1392 rdev = regulator->rdev;
1393
5de70519 1394 debugfs_remove_recursive(regulator->debugfs);
5de70519 1395
414c70cb 1396 /* remove any sysfs entries */
e2c98eaf 1397 if (regulator->dev)
414c70cb 1398 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
5de70519 1399 kfree(regulator->supply_name);
414c70cb
LG		 1400 list_del(&regulator->list);
1401 kfree(regulator);
1402
5ffbd136
MB		 1403 rdev->open_count--;
1404 rdev->exclusive = 0;
1405
414c70cb 1406 module_put(rdev->owner);
23ff2f0f
CK		 1407}
1408
1409/**
1410 * regulator_put - "free" the regulator source
1411 * @regulator: regulator source
1412 *
1413 * Note: drivers must ensure that all regulator_enable calls made on this
1414 * regulator source are balanced by regulator_disable calls prior to calling
1415 * this function.
1416 */
1417void regulator_put(struct regulator *regulator)
1418{
1419 mutex_lock(&regulator_list_mutex);
1420 _regulator_put(regulator);
414c70cb
LG		 1421 mutex_unlock(&regulator_list_mutex);
1422}
1423EXPORT_SYMBOL_GPL(regulator_put);
1424
d5ad34f7
MB		 1425static int devm_regulator_match(struct device *dev, void *res, void *data)
1426{
1427 struct regulator **r = res;
1428 if (!r || !*r) {
1429 WARN_ON(!r || !*r);
1430 return 0;
1431 }
1432 return *r == data;
1433}
1434
1435/**
1436 * devm_regulator_put - Resource managed regulator_put()
1437 * @regulator: regulator to free
1438 *
1439 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1440 * this function will not need to be called and the resource management
1441 * code will ensure that the resource is freed.
1442 */
1443void devm_regulator_put(struct regulator *regulator)
1444{
1445 int rc;
1446
361ff501 1447 rc = devres_release(regulator->dev, devm_regulator_release,
d5ad34f7 1448 devm_regulator_match, regulator);
230a5a1c 1449 if (rc != 0)
968c2c17 1450 WARN_ON(rc);
d5ad34f7
MB		 1451}
1452EXPORT_SYMBOL_GPL(devm_regulator_put);
1453
5c5659d0
MB		 1454static int _regulator_do_enable(struct regulator_dev *rdev)
1455{
1456 int ret, delay;
1457
1458 /* Query before enabling in case configuration dependent. */
1459 ret = _regulator_get_enable_time(rdev);
1460 if (ret >= 0) {
1461 delay = ret;
1462 } else {
1463 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1464 delay = 0;
1465 }
1466
1467 trace_regulator_enable(rdev_get_name(rdev));
1468
65f73508
MB		 1469 if (rdev->ena_gpio) {
1470 gpio_set_value_cansleep(rdev->ena_gpio,
1471 !rdev->ena_gpio_invert);
1472 rdev->ena_gpio_state = 1;
1473 } else if (rdev->desc->ops->enable) {
5c5659d0
MB		 1474 ret = rdev->desc->ops->enable(rdev);
1475 if (ret < 0)
1476 return ret;
1477 } else {
1478 return -EINVAL;
1479 }
1480
1481 /* Allow the regulator to ramp; it would be useful to extend
1482 * this for bulk operations so that the regulators can ramp
1483 * together. */
1484 trace_regulator_enable_delay(rdev_get_name(rdev));
1485
1486 if (delay >= 1000) {
1487 mdelay(delay / 1000);
1488 udelay(delay % 1000);
1489 } else if (delay) {
1490 udelay(delay);
1491 }
1492
1493 trace_regulator_enable_complete(rdev_get_name(rdev));
1494
1495 return 0;
1496}
1497
414c70cb
LG		 1498/* locks held by regulator_enable() */
1499static int _regulator_enable(struct regulator_dev *rdev)
1500{
5c5659d0 1501 int ret;
414c70cb 1502
414c70cb 1503 /* check voltage and requested load before enabling */
9a2372fa
MB		 1504 if (rdev->constraints &&
1505 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1506 drms_uA_update(rdev);
414c70cb 1507
9a2372fa
MB		 1508 if (rdev->use_count == 0) {
1509 /* The regulator may on if it's not switchable or left on */
1510 ret = _regulator_is_enabled(rdev);
1511 if (ret == -EINVAL || ret == 0) {
1512 if (!_regulator_can_change_status(rdev))
1513 return -EPERM;
1514
5c5659d0 1515 ret = _regulator_do_enable(rdev);
31aae2be
MB		 1516 if (ret < 0)
1517 return ret;
1518
a7433cff 1519 } else if (ret < 0) {
5da84fd9 1520 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 1521 return ret;
1522 }
a7433cff 1523 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 1524 }
1525
9a2372fa
MB		 1526 rdev->use_count++;
1527
1528 return 0;
414c70cb
LG		 1529}
1530
1531/**
1532 * regulator_enable - enable regulator output
1533 * @regulator: regulator source
1534 *
cf7bbcdf
MB		 1535 * Request that the regulator be enabled with the regulator output at
1536 * the predefined voltage or current value. Calls to regulator_enable()
1537 * must be balanced with calls to regulator_disable().
1538 *
414c70cb 1539 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 1540 * hardwired in the regulator.
414c70cb
LG		 1541 */
1542int regulator_enable(struct regulator *regulator)
1543{
412aec61
DB		 1544 struct regulator_dev *rdev = regulator->rdev;
1545 int ret = 0;
414c70cb 1546
6492bc1b
MB		 1547 if (regulator->always_on)
1548 return 0;
1549
3801b86a
MB		 1550 if (rdev->supply) {
1551 ret = regulator_enable(rdev->supply);
1552 if (ret != 0)
1553 return ret;
1554 }
1555
412aec61 1556 mutex_lock(&rdev->mutex);
cd94b505 1557 ret = _regulator_enable(rdev);
412aec61 1558 mutex_unlock(&rdev->mutex);
3801b86a 1559
d1685e4e 1560 if (ret != 0 && rdev->supply)
3801b86a
MB		 1561 regulator_disable(rdev->supply);
1562
414c70cb
LG		 1563 return ret;
1564}
1565EXPORT_SYMBOL_GPL(regulator_enable);
1566
5c5659d0
MB		 1567static int _regulator_do_disable(struct regulator_dev *rdev)
1568{
1569 int ret;
1570
1571 trace_regulator_disable(rdev_get_name(rdev));
1572
1573 if (rdev->ena_gpio) {
1574 gpio_set_value_cansleep(rdev->ena_gpio,
1575 rdev->ena_gpio_invert);
1576 rdev->ena_gpio_state = 0;
1577
1578 } else if (rdev->desc->ops->disable) {
1579 ret = rdev->desc->ops->disable(rdev);
1580 if (ret != 0)
1581 return ret;
1582 }
1583
1584 trace_regulator_disable_complete(rdev_get_name(rdev));
1585
1586 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1587 NULL);
1588 return 0;
1589}
1590
414c70cb 1591/* locks held by regulator_disable() */
3801b86a 1592static int _regulator_disable(struct regulator_dev *rdev)
414c70cb
LG		 1593{
1594 int ret = 0;
1595
cd94b505 1596 if (WARN(rdev->use_count <= 0,
43e7ee33 1597 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 1598 return -EIO;
1599
414c70cb 1600 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 1601 if (rdev->use_count == 1 &&
1602 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 1603
1604 /* we are last user */
5c5659d0
MB		 1605 if (_regulator_can_change_status(rdev)) {
1606 ret = _regulator_do_disable(rdev);
414c70cb 1607 if (ret < 0) {
5da84fd9 1608 rdev_err(rdev, "failed to disable\n");
414c70cb
LG		 1609 return ret;
1610 }
1611 }
1612
414c70cb
LG		 1613 rdev->use_count = 0;
1614 } else if (rdev->use_count > 1) {
1615
1616 if (rdev->constraints &&
1617 (rdev->constraints->valid_ops_mask &
1618 REGULATOR_CHANGE_DRMS))
1619 drms_uA_update(rdev);
1620
1621 rdev->use_count--;
1622 }
3801b86a 1623
414c70cb
LG		 1624 return ret;
1625}
1626
1627/**
1628 * regulator_disable - disable regulator output
1629 * @regulator: regulator source
1630 *
cf7bbcdf
MB		 1631 * Disable the regulator output voltage or current. Calls to
1632 * regulator_enable() must be balanced with calls to
1633 * regulator_disable().
69279fb9 1634 *
414c70cb 1635 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 1636 * devices have it enabled, the regulator device supports disabling and
1637 * machine constraints permit this operation.
414c70cb
LG		 1638 */
1639int regulator_disable(struct regulator *regulator)
1640{
412aec61
DB		 1641 struct regulator_dev *rdev = regulator->rdev;
1642 int ret = 0;
414c70cb 1643
6492bc1b
MB		 1644 if (regulator->always_on)
1645 return 0;
1646
412aec61 1647 mutex_lock(&rdev->mutex);
3801b86a 1648 ret = _regulator_disable(rdev);
412aec61 1649 mutex_unlock(&rdev->mutex);
8cbf811d 1650
3801b86a
MB		 1651 if (ret == 0 && rdev->supply)
1652 regulator_disable(rdev->supply);
8cbf811d 1653
414c70cb
LG		 1654 return ret;
1655}
1656EXPORT_SYMBOL_GPL(regulator_disable);
1657
1658/* locks held by regulator_force_disable() */
3801b86a 1659static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 1660{
1661 int ret = 0;
1662
1663 /* force disable */
1664 if (rdev->desc->ops->disable) {
1665 /* ah well, who wants to live forever... */
1666 ret = rdev->desc->ops->disable(rdev);
1667 if (ret < 0) {
5da84fd9 1668 rdev_err(rdev, "failed to force disable\n");
414c70cb
LG		 1669 return ret;
1670 }
1671 /* notify other consumers that power has been forced off */
84b68263
MB		 1672 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1673 REGULATOR_EVENT_DISABLE, NULL);
414c70cb
LG		 1674 }
1675
414c70cb
LG		 1676 return ret;
1677}
1678
1679/**
1680 * regulator_force_disable - force disable regulator output
1681 * @regulator: regulator source
1682 *
1683 * Forcibly disable the regulator output voltage or current.
1684 * NOTE: this *will* disable the regulator output even if other consumer
1685 * devices have it enabled. This should be used for situations when device
1686 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1687 */
1688int regulator_force_disable(struct regulator *regulator)
1689{
82d15839 1690 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 1691 int ret;
1692
82d15839 1693 mutex_lock(&rdev->mutex);
414c70cb 1694 regulator->uA_load = 0;
3801b86a 1695 ret = _regulator_force_disable(regulator->rdev);
82d15839 1696 mutex_unlock(&rdev->mutex);
8cbf811d 1697
3801b86a
MB		 1698 if (rdev->supply)
1699 while (rdev->open_count--)
1700 regulator_disable(rdev->supply);
8cbf811d 1701
414c70cb
LG		 1702 return ret;
1703}
1704EXPORT_SYMBOL_GPL(regulator_force_disable);
1705
da07ecd9
MB		 1706static void regulator_disable_work(struct work_struct *work)
1707{
1708 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1709 disable_work.work);
1710 int count, i, ret;
1711
1712 mutex_lock(&rdev->mutex);
1713
1714 BUG_ON(!rdev->deferred_disables);
1715
1716 count = rdev->deferred_disables;
1717 rdev->deferred_disables = 0;
1718
1719 for (i = 0; i < count; i++) {
1720 ret = _regulator_disable(rdev);
1721 if (ret != 0)
1722 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1723 }
1724
1725 mutex_unlock(&rdev->mutex);
1726
1727 if (rdev->supply) {
1728 for (i = 0; i < count; i++) {
1729 ret = regulator_disable(rdev->supply);
1730 if (ret != 0) {
1731 rdev_err(rdev,
1732 "Supply disable failed: %d\n", ret);
1733 }
1734 }
1735 }
1736}
1737
1738/**
1739 * regulator_disable_deferred - disable regulator output with delay
1740 * @regulator: regulator source
1741 * @ms: miliseconds until the regulator is disabled
1742 *
1743 * Execute regulator_disable() on the regulator after a delay. This
1744 * is intended for use with devices that require some time to quiesce.
1745 *
1746 * NOTE: this will only disable the regulator output if no other consumer
1747 * devices have it enabled, the regulator device supports disabling and
1748 * machine constraints permit this operation.
1749 */
1750int regulator_disable_deferred(struct regulator *regulator, int ms)
1751{
1752 struct regulator_dev *rdev = regulator->rdev;
aa59802d 1753 int ret;
da07ecd9 1754
6492bc1b
MB		 1755 if (regulator->always_on)
1756 return 0;
1757
2b5a24a0
MB		 1758 if (!ms)
1759 return regulator_disable(regulator);
1760
da07ecd9
MB		 1761 mutex_lock(&rdev->mutex);
1762 rdev->deferred_disables++;
1763 mutex_unlock(&rdev->mutex);
1764
aa59802d
MB		 1765 ret = schedule_delayed_work(&rdev->disable_work,
1766 msecs_to_jiffies(ms));
1767 if (ret < 0)
1768 return ret;
1769 else
1770 return 0;
da07ecd9
MB		 1771}
1772EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1773
cd6dffb4
MB		 1774/**
1775 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1776 *
1777 * @rdev: regulator to operate on
1778 *
1779 * Regulators that use regmap for their register I/O can set the
1780 * enable_reg and enable_mask fields in their descriptor and then use
1781 * this as their is_enabled operation, saving some code.
1782 */
1783int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1784{
1785 unsigned int val;
1786 int ret;
1787
1788 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1789 if (ret != 0)
1790 return ret;
1791
1792 return (val & rdev->desc->enable_mask) != 0;
1793}
1794EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1795
1796/**
1797 * regulator_enable_regmap - standard enable() for regmap users
1798 *
1799 * @rdev: regulator to operate on
1800 *
1801 * Regulators that use regmap for their register I/O can set the
1802 * enable_reg and enable_mask fields in their descriptor and then use
1803 * this as their enable() operation, saving some code.
1804 */
1805int regulator_enable_regmap(struct regulator_dev *rdev)
1806{
1807 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1808 rdev->desc->enable_mask,
1809 rdev->desc->enable_mask);
1810}
1811EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1812
1813/**
1814 * regulator_disable_regmap - standard disable() for regmap users
1815 *
1816 * @rdev: regulator to operate on
1817 *
1818 * Regulators that use regmap for their register I/O can set the
1819 * enable_reg and enable_mask fields in their descriptor and then use
1820 * this as their disable() operation, saving some code.
1821 */
1822int regulator_disable_regmap(struct regulator_dev *rdev)
1823{
1824 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1825 rdev->desc->enable_mask, 0);
1826}
1827EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1828
414c70cb
LG		 1829static int _regulator_is_enabled(struct regulator_dev *rdev)
1830{
65f73508
MB		 1831 /* A GPIO control always takes precedence */
1832 if (rdev->ena_gpio)
1833 return rdev->ena_gpio_state;
1834
9a7f6a4c 1835 /* If we don't know then assume that the regulator is always on */
9332546f 1836 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 1837 return 1;
414c70cb 1838
9332546f 1839 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 1840}
1841
1842/**
1843 * regulator_is_enabled - is the regulator output enabled
1844 * @regulator: regulator source
1845 *
412aec61
DB		 1846 * Returns positive if the regulator driver backing the source/client
1847 * has requested that the device be enabled, zero if it hasn't, else a
1848 * negative errno code.
1849 *
1850 * Note that the device backing this regulator handle can have multiple
1851 * users, so it might be enabled even if regulator_enable() was never
1852 * called for this particular source.
414c70cb
LG		 1853 */
1854int regulator_is_enabled(struct regulator *regulator)
1855{
9332546f
MB		 1856 int ret;
1857
6492bc1b
MB		 1858 if (regulator->always_on)
1859 return 1;
1860
9332546f
MB		 1861 mutex_lock(&regulator->rdev->mutex);
1862 ret = _regulator_is_enabled(regulator->rdev);
1863 mutex_unlock(&regulator->rdev->mutex);
1864
1865 return ret;
414c70cb
LG		 1866}
1867EXPORT_SYMBOL_GPL(regulator_is_enabled);
1868
4367cfdc
DB		 1869/**
1870 * regulator_count_voltages - count regulator_list_voltage() selectors
1871 * @regulator: regulator source
1872 *
1873 * Returns number of selectors, or negative errno. Selectors are
1874 * numbered starting at zero, and typically correspond to bitfields
1875 * in hardware registers.
1876 */
1877int regulator_count_voltages(struct regulator *regulator)
1878{
1879 struct regulator_dev *rdev = regulator->rdev;
1880
1881 return rdev->desc->n_voltages ? : -EINVAL;
1882}
1883EXPORT_SYMBOL_GPL(regulator_count_voltages);
1884
bca7bbff
MB		 1885/**
1886 * regulator_list_voltage_linear - List voltages with simple calculation
1887 *
1888 * @rdev: Regulator device
1889 * @selector: Selector to convert into a voltage
1890 *
1891 * Regulators with a simple linear mapping between voltages and
1892 * selectors can set min_uV and uV_step in the regulator descriptor
1893 * and then use this function as their list_voltage() operation,
1894 */
1895int regulator_list_voltage_linear(struct regulator_dev *rdev,
1896 unsigned int selector)
1897{
1898 if (selector >= rdev->desc->n_voltages)
1899 return -EINVAL;
1900
1901 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
1902}
1903EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
1904
cffc9592
AL		 1905/**
1906 * regulator_list_voltage_table - List voltages with table based mapping
1907 *
1908 * @rdev: Regulator device
1909 * @selector: Selector to convert into a voltage
1910 *
1911 * Regulators with table based mapping between voltages and
1912 * selectors can set volt_table in the regulator descriptor
1913 * and then use this function as their list_voltage() operation.
1914 */
1915int regulator_list_voltage_table(struct regulator_dev *rdev,
1916 unsigned int selector)
1917{
1918 if (!rdev->desc->volt_table) {
1919 BUG_ON(!rdev->desc->volt_table);
1920 return -EINVAL;
1921 }
1922
1923 if (selector >= rdev->desc->n_voltages)
1924 return -EINVAL;
1925
1926 return rdev->desc->volt_table[selector];
1927}
1928EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
1929
4367cfdc
DB		 1930/**
1931 * regulator_list_voltage - enumerate supported voltages
1932 * @regulator: regulator source
1933 * @selector: identify voltage to list
1934 * Context: can sleep
1935 *
1936 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 1937 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 1938 * negative errno.
1939 */
1940int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1941{
1942 struct regulator_dev *rdev = regulator->rdev;
1943 struct regulator_ops *ops = rdev->desc->ops;
1944 int ret;
1945
1946 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1947 return -EINVAL;
1948
1949 mutex_lock(&rdev->mutex);
1950 ret = ops->list_voltage(rdev, selector);
1951 mutex_unlock(&rdev->mutex);
1952
1953 if (ret > 0) {
1954 if (ret < rdev->constraints->min_uV)
1955 ret = 0;
1956 else if (ret > rdev->constraints->max_uV)
1957 ret = 0;
1958 }
1959
1960 return ret;
1961}
1962EXPORT_SYMBOL_GPL(regulator_list_voltage);
1963
a7a1ad90
MB		 1964/**
1965 * regulator_is_supported_voltage - check if a voltage range can be supported
1966 *
1967 * @regulator: Regulator to check.
1968 * @min_uV: Minimum required voltage in uV.
1969 * @max_uV: Maximum required voltage in uV.
1970 *
1971 * Returns a boolean or a negative error code.
1972 */
1973int regulator_is_supported_voltage(struct regulator *regulator,
1974 int min_uV, int max_uV)
1975{
c5f3939b 1976 struct regulator_dev *rdev = regulator->rdev;
a7a1ad90
MB		 1977 int i, voltages, ret;
1978
c5f3939b
MB		 1979 /* If we can't change voltage check the current voltage */
1980 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
1981 ret = regulator_get_voltage(regulator);
1982 if (ret >= 0)
f0f98b19 1983 return (min_uV <= ret && ret <= max_uV);
c5f3939b
MB		 1984 else
1985 return ret;
1986 }
1987
bd7a2b60
PM		 1988 /* Any voltage within constrains range is fine? */
1989 if (rdev->desc->continuous_voltage_range)
1990 return min_uV >= rdev->constraints->min_uV &&
1991 max_uV <= rdev->constraints->max_uV;
1992
a7a1ad90
MB		 1993 ret = regulator_count_voltages(regulator);
1994 if (ret < 0)
1995 return ret;
1996 voltages = ret;
1997
1998 for (i = 0; i < voltages; i++) {
1999 ret = regulator_list_voltage(regulator, i);
2000
2001 if (ret >= min_uV && ret <= max_uV)
2002 return 1;
2003 }
2004
2005 return 0;
2006}
a398eaa2 2007EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 2008
4ab5b3d9
MB		 2009/**
2010 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2011 *
2012 * @rdev: regulator to operate on
2013 *
2014 * Regulators that use regmap for their register I/O can set the
2015 * vsel_reg and vsel_mask fields in their descriptor and then use this
2016 * as their get_voltage_vsel operation, saving some code.
2017 */
2018int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
2019{
2020 unsigned int val;
2021 int ret;
2022
2023 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
2024 if (ret != 0)
2025 return ret;
2026
2027 val &= rdev->desc->vsel_mask;
2028 val >>= ffs(rdev->desc->vsel_mask) - 1;
2029
2030 return val;
2031}
2032EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
2033
2034/**
2035 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2036 *
2037 * @rdev: regulator to operate on
2038 * @sel: Selector to set
2039 *
2040 * Regulators that use regmap for their register I/O can set the
2041 * vsel_reg and vsel_mask fields in their descriptor and then use this
2042 * as their set_voltage_vsel operation, saving some code.
2043 */
2044int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
2045{
2046 sel <<= ffs(rdev->desc->vsel_mask) - 1;
2047
2048 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
2049 rdev->desc->vsel_mask, sel);
2050}
2051EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
2052
e843fc46
MB		 2053/**
2054 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2055 *
2056 * @rdev: Regulator to operate on
2057 * @min_uV: Lower bound for voltage
2058 * @max_uV: Upper bound for voltage
2059 *
2060 * Drivers implementing set_voltage_sel() and list_voltage() can use
2061 * this as their map_voltage() operation. It will find a suitable
2062 * voltage by calling list_voltage() until it gets something in bounds
2063 * for the requested voltages.
2064 */
2065int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2066 int min_uV, int max_uV)
2067{
2068 int best_val = INT_MAX;
2069 int selector = 0;
2070 int i, ret;
2071
2072 /* Find the smallest voltage that falls within the specified
2073 * range.
2074 */
2075 for (i = 0; i < rdev->desc->n_voltages; i++) {
2076 ret = rdev->desc->ops->list_voltage(rdev, i);
2077 if (ret < 0)
2078 continue;
2079
2080 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2081 best_val = ret;
2082 selector = i;
2083 }
2084 }
2085
2086 if (best_val != INT_MAX)
2087 return selector;
2088 else
2089 return -EINVAL;
2090}
2091EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2092
bca7bbff
MB		 2093/**
2094 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2095 *
2096 * @rdev: Regulator to operate on
2097 * @min_uV: Lower bound for voltage
2098 * @max_uV: Upper bound for voltage
2099 *
2100 * Drivers providing min_uV and uV_step in their regulator_desc can
2101 * use this as their map_voltage() operation.
2102 */
2103int regulator_map_voltage_linear(struct regulator_dev *rdev,
2104 int min_uV, int max_uV)
2105{
2106 int ret, voltage;
2107
5a6881e8
AL		 2108 /* Allow uV_step to be 0 for fixed voltage */
2109 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
2110 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
2111 return 0;
2112 else
2113 return -EINVAL;
2114 }
2115
bca7bbff
MB		 2116 if (!rdev->desc->uV_step) {
2117 BUG_ON(!rdev->desc->uV_step);
2118 return -EINVAL;
2119 }
2120
0bdc81e4
AL		 2121 if (min_uV < rdev->desc->min_uV)
2122 min_uV = rdev->desc->min_uV;
2123
ccfcb1c3 2124 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
bca7bbff
MB		 2125 if (ret < 0)
2126 return ret;
2127
2128 /* Map back into a voltage to verify we're still in bounds */
2129 voltage = rdev->desc->ops->list_voltage(rdev, ret);
2130 if (voltage < min_uV || voltage > max_uV)
2131 return -EINVAL;
2132
2133 return ret;
2134}
2135EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2136
75790251
MB		 2137static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2138 int min_uV, int max_uV)
2139{
2140 int ret;
77af1b26 2141 int delay = 0;
e113d792 2142 int best_val = 0;
75790251 2143 unsigned int selector;
eba41a5e 2144 int old_selector = -1;
75790251
MB		 2145
2146 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2147
bf5892a8
MB		 2148 min_uV += rdev->constraints->uV_offset;
2149 max_uV += rdev->constraints->uV_offset;
2150
eba41a5e
AL		 2151 /*
2152 * If we can't obtain the old selector there is not enough
2153 * info to call set_voltage_time_sel().
2154 */
8b7485ef
AL		 2155 if (_regulator_is_enabled(rdev) &&
2156 rdev->desc->ops->set_voltage_time_sel &&
eba41a5e
AL		 2157 rdev->desc->ops->get_voltage_sel) {
2158 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2159 if (old_selector < 0)
2160 return old_selector;
2161 }
2162
75790251
MB		 2163 if (rdev->desc->ops->set_voltage) {
2164 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2165 &selector);
e113d792
MB		 2166
2167 if (ret >= 0) {
2168 if (rdev->desc->ops->list_voltage)
2169 best_val = rdev->desc->ops->list_voltage(rdev,
2170 selector);
2171 else
2172 best_val = _regulator_get_voltage(rdev);
2173 }
2174
e8eef82b 2175 } else if (rdev->desc->ops->set_voltage_sel) {
9152c36a 2176 if (rdev->desc->ops->map_voltage) {
e843fc46
MB		 2177 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2178 max_uV);
9152c36a
AL		 2179 } else {
2180 if (rdev->desc->ops->list_voltage ==
2181 regulator_list_voltage_linear)
2182 ret = regulator_map_voltage_linear(rdev,
2183 min_uV, max_uV);
2184 else
2185 ret = regulator_map_voltage_iterate(rdev,
2186 min_uV, max_uV);
2187 }
e8eef82b 2188
e843fc46 2189 if (ret >= 0) {
e113d792
MB		 2190 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2191 if (min_uV <= best_val && max_uV >= best_val) {
2192 selector = ret;
2193 ret = rdev->desc->ops->set_voltage_sel(rdev,
2194 ret);
2195 } else {
2196 ret = -EINVAL;
2197 }
e8eef82b 2198 }
75790251
MB		 2199 } else {
2200 ret = -EINVAL;
2201 }
e8eef82b 2202
eba41a5e 2203 /* Call set_voltage_time_sel if successfully obtained old_selector */
5aff3a8b 2204 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
eba41a5e 2205 rdev->desc->ops->set_voltage_time_sel) {
77af1b26 2206
eba41a5e
AL		 2207 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2208 old_selector, selector);
2209 if (delay < 0) {
2210 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2211 delay);
2212 delay = 0;
e8eef82b 2213 }
75790251 2214
8b96de31
PR		 2215 /* Insert any necessary delays */
2216 if (delay >= 1000) {
2217 mdelay(delay / 1000);
2218 udelay(delay % 1000);
2219 } else if (delay) {
2220 udelay(delay);
2221 }
77af1b26
LW		 2222 }
2223
2f6c797f
AL		 2224 if (ret == 0 && best_val >= 0) {
2225 unsigned long data = best_val;
2226
ded06a52 2227 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2f6c797f
AL		 2228 (void *)data);
2229 }
ded06a52 2230
eba41a5e 2231 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
75790251
MB		 2232
2233 return ret;
2234}
2235
414c70cb
LG		 2236/**
2237 * regulator_set_voltage - set regulator output voltage
2238 * @regulator: regulator source
2239 * @min_uV: Minimum required voltage in uV
2240 * @max_uV: Maximum acceptable voltage in uV
2241 *
2242 * Sets a voltage regulator to the desired output voltage. This can be set
2243 * during any regulator state. IOW, regulator can be disabled or enabled.
2244 *
2245 * If the regulator is enabled then the voltage will change to the new value
2246 * immediately otherwise if the regulator is disabled the regulator will
2247 * output at the new voltage when enabled.
2248 *
2249 * NOTE: If the regulator is shared between several devices then the lowest
2250 * request voltage that meets the system constraints will be used.
69279fb9 2251 * Regulator system constraints must be set for this regulator before
414c70cb
LG		 2252 * calling this function otherwise this call will fail.
2253 */
2254int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2255{
2256 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 2257 int ret = 0;
414c70cb
LG		 2258
2259 mutex_lock(&rdev->mutex);
2260
95a3c23a
MB		 2261 /* If we're setting the same range as last time the change
2262 * should be a noop (some cpufreq implementations use the same
2263 * voltage for multiple frequencies, for example).
2264 */
2265 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2266 goto out;
2267
414c70cb 2268 /* sanity check */
e8eef82b
MB		 2269 if (!rdev->desc->ops->set_voltage &&
2270 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 2271 ret = -EINVAL;
2272 goto out;
2273 }
2274
2275 /* constraints check */
2276 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2277 if (ret < 0)
2278 goto out;
2279 regulator->min_uV = min_uV;
2280 regulator->max_uV = max_uV;
3a93f2a9 2281
05fda3b1
TP		 2282 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2283 if (ret < 0)
2284 goto out;
2285
75790251 2286 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
02fa3ec0 2287
414c70cb
LG		 2288out:
2289 mutex_unlock(&rdev->mutex);
2290 return ret;
2291}
2292EXPORT_SYMBOL_GPL(regulator_set_voltage);
2293
88cd222b
LW		 2294/**
2295 * regulator_set_voltage_time - get raise/fall time
2296 * @regulator: regulator source
2297 * @old_uV: starting voltage in microvolts
2298 * @new_uV: target voltage in microvolts
2299 *
2300 * Provided with the starting and ending voltage, this function attempts to
2301 * calculate the time in microseconds required to rise or fall to this new
2302 * voltage.
2303 */
2304int regulator_set_voltage_time(struct regulator *regulator,
2305 int old_uV, int new_uV)
2306{
2307 struct regulator_dev *rdev = regulator->rdev;
2308 struct regulator_ops *ops = rdev->desc->ops;
2309 int old_sel = -1;
2310 int new_sel = -1;
2311 int voltage;
2312 int i;
2313
2314 /* Currently requires operations to do this */
2315 if (!ops->list_voltage || !ops->set_voltage_time_sel
2316 || !rdev->desc->n_voltages)
2317 return -EINVAL;
2318
2319 for (i = 0; i < rdev->desc->n_voltages; i++) {
2320 /* We only look for exact voltage matches here */
2321 voltage = regulator_list_voltage(regulator, i);
2322 if (voltage < 0)
2323 return -EINVAL;
2324 if (voltage == 0)
2325 continue;
2326 if (voltage == old_uV)
2327 old_sel = i;
2328 if (voltage == new_uV)
2329 new_sel = i;
2330 }
2331
2332 if (old_sel < 0 || new_sel < 0)
2333 return -EINVAL;
2334
2335 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2336}
2337EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2338
98a175b6 2339/**
296c6566
RD		 2340 * regulator_set_voltage_time_sel - get raise/fall time
2341 * @rdev: regulator source device
98a175b6
YSB		 2342 * @old_selector: selector for starting voltage
2343 * @new_selector: selector for target voltage
2344 *
2345 * Provided with the starting and target voltage selectors, this function
2346 * returns time in microseconds required to rise or fall to this new voltage
2347 *
f11d08c3 2348 * Drivers providing ramp_delay in regulation_constraints can use this as their
398715ab 2349 * set_voltage_time_sel() operation.
98a175b6
YSB		 2350 */
2351int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2352 unsigned int old_selector,
2353 unsigned int new_selector)
2354{
398715ab 2355 unsigned int ramp_delay = 0;
f11d08c3 2356 int old_volt, new_volt;
398715ab
AL		 2357
2358 if (rdev->constraints->ramp_delay)
2359 ramp_delay = rdev->constraints->ramp_delay;
2360 else if (rdev->desc->ramp_delay)
2361 ramp_delay = rdev->desc->ramp_delay;
2362
2363 if (ramp_delay == 0) {
6f0b2c69 2364 rdev_warn(rdev, "ramp_delay not set\n");
398715ab 2365 return 0;
6f0b2c69 2366 }
398715ab 2367
f11d08c3
AL		 2368 /* sanity check */
2369 if (!rdev->desc->ops->list_voltage)
2370 return -EINVAL;
398715ab 2371
f11d08c3
AL		 2372 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2373 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2374
2375 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
98a175b6 2376}
b19dbf71 2377EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
98a175b6 2378
606a2562
MB		 2379/**
2380 * regulator_sync_voltage - re-apply last regulator output voltage
2381 * @regulator: regulator source
2382 *
2383 * Re-apply the last configured voltage. This is intended to be used
2384 * where some external control source the consumer is cooperating with
2385 * has caused the configured voltage to change.
2386 */
2387int regulator_sync_voltage(struct regulator *regulator)
2388{
2389 struct regulator_dev *rdev = regulator->rdev;
2390 int ret, min_uV, max_uV;
2391
2392 mutex_lock(&rdev->mutex);
2393
2394 if (!rdev->desc->ops->set_voltage &&
2395 !rdev->desc->ops->set_voltage_sel) {
2396 ret = -EINVAL;
2397 goto out;
2398 }
2399
2400 /* This is only going to work if we've had a voltage configured. */
2401 if (!regulator->min_uV && !regulator->max_uV) {
2402 ret = -EINVAL;
2403 goto out;
2404 }
2405
2406 min_uV = regulator->min_uV;
2407 max_uV = regulator->max_uV;
2408
2409 /* This should be a paranoia check... */
2410 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2411 if (ret < 0)
2412 goto out;
2413
2414 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2415 if (ret < 0)
2416 goto out;
2417
2418 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2419
2420out:
2421 mutex_unlock(&rdev->mutex);
2422 return ret;
2423}
2424EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2425
414c70cb
LG		 2426static int _regulator_get_voltage(struct regulator_dev *rdev)
2427{
bf5892a8 2428 int sel, ret;
476c2d83
MB		 2429
2430 if (rdev->desc->ops->get_voltage_sel) {
2431 sel = rdev->desc->ops->get_voltage_sel(rdev);
2432 if (sel < 0)
2433 return sel;
bf5892a8 2434 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 2435 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 2436 ret = rdev->desc->ops->get_voltage(rdev);
f7df20ec
MB		 2437 } else if (rdev->desc->ops->list_voltage) {
2438 ret = rdev->desc->ops->list_voltage(rdev, 0);
cb220d16 2439 } else {
414c70cb 2440 return -EINVAL;
cb220d16 2441 }
bf5892a8 2442
cb220d16
AL		 2443 if (ret < 0)
2444 return ret;
bf5892a8 2445 return ret - rdev->constraints->uV_offset;
414c70cb
LG		 2446}
2447
2448/**
2449 * regulator_get_voltage - get regulator output voltage
2450 * @regulator: regulator source
2451 *
2452 * This returns the current regulator voltage in uV.
2453 *
2454 * NOTE: If the regulator is disabled it will return the voltage value. This
2455 * function should not be used to determine regulator state.
2456 */
2457int regulator_get_voltage(struct regulator *regulator)
2458{
2459 int ret;
2460
2461 mutex_lock(&regulator->rdev->mutex);
2462
2463 ret = _regulator_get_voltage(regulator->rdev);
2464
2465 mutex_unlock(&regulator->rdev->mutex);
2466
2467 return ret;
2468}
2469EXPORT_SYMBOL_GPL(regulator_get_voltage);
2470
2471/**
2472 * regulator_set_current_limit - set regulator output current limit
2473 * @regulator: regulator source
2474 * @min_uA: Minimuum supported current in uA
2475 * @max_uA: Maximum supported current in uA
2476 *
2477 * Sets current sink to the desired output current. This can be set during
2478 * any regulator state. IOW, regulator can be disabled or enabled.
2479 *
2480 * If the regulator is enabled then the current will change to the new value
2481 * immediately otherwise if the regulator is disabled the regulator will
2482 * output at the new current when enabled.
2483 *
2484 * NOTE: Regulator system constraints must be set for this regulator before
2485 * calling this function otherwise this call will fail.
2486 */
2487int regulator_set_current_limit(struct regulator *regulator,
2488 int min_uA, int max_uA)
2489{
2490 struct regulator_dev *rdev = regulator->rdev;
2491 int ret;
2492
2493 mutex_lock(&rdev->mutex);
2494
2495 /* sanity check */
2496 if (!rdev->desc->ops->set_current_limit) {
2497 ret = -EINVAL;
2498 goto out;
2499 }
2500
2501 /* constraints check */
2502 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2503 if (ret < 0)
2504 goto out;
2505
2506 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2507out:
2508 mutex_unlock(&rdev->mutex);
2509 return ret;
2510}
2511EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2512
2513static int _regulator_get_current_limit(struct regulator_dev *rdev)
2514{
2515 int ret;
2516
2517 mutex_lock(&rdev->mutex);
2518
2519 /* sanity check */
2520 if (!rdev->desc->ops->get_current_limit) {
2521 ret = -EINVAL;
2522 goto out;
2523 }
2524
2525 ret = rdev->desc->ops->get_current_limit(rdev);
2526out:
2527 mutex_unlock(&rdev->mutex);
2528 return ret;
2529}
2530
2531/**
2532 * regulator_get_current_limit - get regulator output current
2533 * @regulator: regulator source
2534 *
2535 * This returns the current supplied by the specified current sink in uA.
2536 *
2537 * NOTE: If the regulator is disabled it will return the current value. This
2538 * function should not be used to determine regulator state.
2539 */
2540int regulator_get_current_limit(struct regulator *regulator)
2541{
2542 return _regulator_get_current_limit(regulator->rdev);
2543}
2544EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2545
2546/**
2547 * regulator_set_mode - set regulator operating mode
2548 * @regulator: regulator source
2549 * @mode: operating mode - one of the REGULATOR_MODE constants
2550 *
2551 * Set regulator operating mode to increase regulator efficiency or improve
2552 * regulation performance.
2553 *
2554 * NOTE: Regulator system constraints must be set for this regulator before
2555 * calling this function otherwise this call will fail.
2556 */
2557int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2558{
2559 struct regulator_dev *rdev = regulator->rdev;
2560 int ret;
500b4ac9 2561 int regulator_curr_mode;
414c70cb
LG		 2562
2563 mutex_lock(&rdev->mutex);
2564
2565 /* sanity check */
2566 if (!rdev->desc->ops->set_mode) {
2567 ret = -EINVAL;
2568 goto out;
2569 }
2570
500b4ac9
SI		 2571 /* return if the same mode is requested */
2572 if (rdev->desc->ops->get_mode) {
2573 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2574 if (regulator_curr_mode == mode) {
2575 ret = 0;
2576 goto out;
2577 }
2578 }
2579
414c70cb 2580 /* constraints check */
22c51b47 2581 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 2582 if (ret < 0)
2583 goto out;
2584
2585 ret = rdev->desc->ops->set_mode(rdev, mode);
2586out:
2587 mutex_unlock(&rdev->mutex);
2588 return ret;
2589}
2590EXPORT_SYMBOL_GPL(regulator_set_mode);
2591
2592static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2593{
2594 int ret;
2595
2596 mutex_lock(&rdev->mutex);
2597
2598 /* sanity check */
2599 if (!rdev->desc->ops->get_mode) {
2600 ret = -EINVAL;
2601 goto out;
2602 }
2603
2604 ret = rdev->desc->ops->get_mode(rdev);
2605out:
2606 mutex_unlock(&rdev->mutex);
2607 return ret;
2608}
2609
2610/**
2611 * regulator_get_mode - get regulator operating mode
2612 * @regulator: regulator source
2613 *
2614 * Get the current regulator operating mode.
2615 */
2616unsigned int regulator_get_mode(struct regulator *regulator)
2617{
2618 return _regulator_get_mode(regulator->rdev);
2619}
2620EXPORT_SYMBOL_GPL(regulator_get_mode);
2621
2622/**
2623 * regulator_set_optimum_mode - set regulator optimum operating mode
2624 * @regulator: regulator source
2625 * @uA_load: load current
2626 *
2627 * Notifies the regulator core of a new device load. This is then used by
2628 * DRMS (if enabled by constraints) to set the most efficient regulator
2629 * operating mode for the new regulator loading.
2630 *
2631 * Consumer devices notify their supply regulator of the maximum power
2632 * they will require (can be taken from device datasheet in the power
2633 * consumption tables) when they change operational status and hence power
2634 * state. Examples of operational state changes that can affect power
2635 * consumption are :-
2636 *
2637 * o Device is opened / closed.
2638 * o Device I/O is about to begin or has just finished.
2639 * o Device is idling in between work.
2640 *
2641 * This information is also exported via sysfs to userspace.
2642 *
2643 * DRMS will sum the total requested load on the regulator and change
2644 * to the most efficient operating mode if platform constraints allow.
2645 *
2646 * Returns the new regulator mode or error.
2647 */
2648int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2649{
2650 struct regulator_dev *rdev = regulator->rdev;
2651 struct regulator *consumer;
d92d95b6 2652 int ret, output_uV, input_uV = 0, total_uA_load = 0;
414c70cb
LG		 2653 unsigned int mode;
2654
d92d95b6
SB		 2655 if (rdev->supply)
2656 input_uV = regulator_get_voltage(rdev->supply);
2657
414c70cb
LG		 2658 mutex_lock(&rdev->mutex);
2659
a4b41483
MB		 2660 /*
2661 * first check to see if we can set modes at all, otherwise just
2662 * tell the consumer everything is OK.
2663 */
414c70cb
LG		 2664 regulator->uA_load = uA_load;
2665 ret = regulator_check_drms(rdev);
a4b41483
MB		 2666 if (ret < 0) {
2667 ret = 0;
414c70cb 2668 goto out;
a4b41483 2669 }
414c70cb 2670
414c70cb
LG		 2671 if (!rdev->desc->ops->get_optimum_mode)
2672 goto out;
2673
a4b41483
MB		 2674 /*
2675 * we can actually do this so any errors are indicators of
2676 * potential real failure.
2677 */
2678 ret = -EINVAL;
2679
854ccbae
AL		 2680 if (!rdev->desc->ops->set_mode)
2681 goto out;
2682
414c70cb 2683 /* get output voltage */
1bf5a1f8 2684 output_uV = _regulator_get_voltage(rdev);
414c70cb 2685 if (output_uV <= 0) {
5da84fd9 2686 rdev_err(rdev, "invalid output voltage found\n");
414c70cb
LG		 2687 goto out;
2688 }
2689
d92d95b6 2690 /* No supply? Use constraint voltage */
1bf5a1f8 2691 if (input_uV <= 0)
414c70cb
LG		 2692 input_uV = rdev->constraints->input_uV;
2693 if (input_uV <= 0) {
5da84fd9 2694 rdev_err(rdev, "invalid input voltage found\n");
414c70cb
LG		 2695 goto out;
2696 }
2697
2698 /* calc total requested load for this regulator */
2699 list_for_each_entry(consumer, &rdev->consumer_list, list)
fa2984d4 2700 total_uA_load += consumer->uA_load;
414c70cb
LG		 2701
2702 mode = rdev->desc->ops->get_optimum_mode(rdev,
2703 input_uV, output_uV,
2704 total_uA_load);
2c608234 2705 ret = regulator_mode_constrain(rdev, &mode);
e573520b 2706 if (ret < 0) {
5da84fd9
JP		 2707 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2708 total_uA_load, input_uV, output_uV);
414c70cb
LG		 2709 goto out;
2710 }
2711
2712 ret = rdev->desc->ops->set_mode(rdev, mode);
e573520b 2713 if (ret < 0) {
5da84fd9 2714 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
414c70cb
LG		 2715 goto out;
2716 }
2717 ret = mode;
2718out:
2719 mutex_unlock(&rdev->mutex);
2720 return ret;
2721}
2722EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2723
df367931
MB		 2724/**
2725 * regulator_set_bypass_regmap - Default set_bypass() using regmap
2726 *
2727 * @rdev: device to operate on.
2728 * @enable: state to set.
2729 */
2730int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
2731{
2732 unsigned int val;
2733
2734 if (enable)
2735 val = rdev->desc->bypass_mask;
2736 else
2737 val = 0;
2738
2739 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
2740 rdev->desc->bypass_mask, val);
2741}
2742EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
2743
2744/**
2745 * regulator_get_bypass_regmap - Default get_bypass() using regmap
2746 *
2747 * @rdev: device to operate on.
2748 * @enable: current state.
2749 */
2750int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
2751{
2752 unsigned int val;
2753 int ret;
2754
2755 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
2756 if (ret != 0)
2757 return ret;
2758
2759 *enable = val & rdev->desc->bypass_mask;
2760
2761 return 0;
2762}
2763EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
2764
f59c8f9f
MB		 2765/**
2766 * regulator_allow_bypass - allow the regulator to go into bypass mode
2767 *
2768 * @regulator: Regulator to configure
2769 * @allow: enable or disable bypass mode
2770 *
2771 * Allow the regulator to go into bypass mode if all other consumers
2772 * for the regulator also enable bypass mode and the machine
2773 * constraints allow this. Bypass mode means that the regulator is
2774 * simply passing the input directly to the output with no regulation.
2775 */
2776int regulator_allow_bypass(struct regulator *regulator, bool enable)
2777{
2778 struct regulator_dev *rdev = regulator->rdev;
2779 int ret = 0;
2780
2781 if (!rdev->desc->ops->set_bypass)
2782 return 0;
2783
2784 if (rdev->constraints &&
2785 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
2786 return 0;
2787
2788 mutex_lock(&rdev->mutex);
2789
2790 if (enable && !regulator->bypass) {
2791 rdev->bypass_count++;
2792
2793 if (rdev->bypass_count == rdev->open_count) {
2794 ret = rdev->desc->ops->set_bypass(rdev, enable);
2795 if (ret != 0)
2796 rdev->bypass_count--;
2797 }
2798
2799 } else if (!enable && regulator->bypass) {
2800 rdev->bypass_count--;
2801
2802 if (rdev->bypass_count != rdev->open_count) {
2803 ret = rdev->desc->ops->set_bypass(rdev, enable);
2804 if (ret != 0)
2805 rdev->bypass_count++;
2806 }
2807 }
2808
2809 if (ret == 0)
2810 regulator->bypass = enable;
2811
2812 mutex_unlock(&rdev->mutex);
2813
2814 return ret;
2815}
2816EXPORT_SYMBOL_GPL(regulator_allow_bypass);
2817
414c70cb
LG		 2818/**
2819 * regulator_register_notifier - register regulator event notifier
2820 * @regulator: regulator source
69279fb9 2821 * @nb: notifier block
414c70cb
LG		 2822 *
2823 * Register notifier block to receive regulator events.
2824 */
2825int regulator_register_notifier(struct regulator *regulator,
2826 struct notifier_block *nb)
2827{
2828 return blocking_notifier_chain_register(&regulator->rdev->notifier,
2829 nb);
2830}
2831EXPORT_SYMBOL_GPL(regulator_register_notifier);
2832
2833/**
2834 * regulator_unregister_notifier - unregister regulator event notifier
2835 * @regulator: regulator source
69279fb9 2836 * @nb: notifier block
414c70cb
LG		 2837 *
2838 * Unregister regulator event notifier block.
2839 */
2840int regulator_unregister_notifier(struct regulator *regulator,
2841 struct notifier_block *nb)
2842{
2843 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2844 nb);
2845}
2846EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2847
b136fb44
JC		 2848/* notify regulator consumers and downstream regulator consumers.
2849 * Note mutex must be held by caller.
2850 */
414c70cb
LG		 2851static void _notifier_call_chain(struct regulator_dev *rdev,
2852 unsigned long event, void *data)
2853{
414c70cb 2854 /* call rdev chain first */
d8493d21 2855 blocking_notifier_call_chain(&rdev->notifier, event, data);
414c70cb
LG		 2856}
2857
2858/**
2859 * regulator_bulk_get - get multiple regulator consumers
2860 *
2861 * @dev: Device to supply
2862 * @num_consumers: Number of consumers to register
2863 * @consumers: Configuration of consumers; clients are stored here.
2864 *
2865 * @return 0 on success, an errno on failure.
2866 *
2867 * This helper function allows drivers to get several regulator
2868 * consumers in one operation. If any of the regulators cannot be
2869 * acquired then any regulators that were allocated will be freed
2870 * before returning to the caller.
2871 */
2872int regulator_bulk_get(struct device *dev, int num_consumers,
2873 struct regulator_bulk_data *consumers)
2874{
2875 int i;
2876 int ret;
2877
2878 for (i = 0; i < num_consumers; i++)
2879 consumers[i].consumer = NULL;
2880
2881 for (i = 0; i < num_consumers; i++) {
2882 consumers[i].consumer = regulator_get(dev,
2883 consumers[i].supply);
2884 if (IS_ERR(consumers[i].consumer)) {
414c70cb 2885 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 2886 dev_err(dev, "Failed to get supply '%s': %d\n",
2887 consumers[i].supply, ret);
414c70cb
LG		 2888 consumers[i].consumer = NULL;
2889 goto err;
2890 }
2891 }
2892
2893 return 0;
2894
2895err:
b29c7690 2896 while (--i >= 0)
414c70cb
LG		 2897 regulator_put(consumers[i].consumer);
2898
2899 return ret;
2900}
2901EXPORT_SYMBOL_GPL(regulator_bulk_get);
2902
e6e74030
MB		 2903/**
2904 * devm_regulator_bulk_get - managed get multiple regulator consumers
2905 *
2906 * @dev: Device to supply
2907 * @num_consumers: Number of consumers to register
2908 * @consumers: Configuration of consumers; clients are stored here.
2909 *
2910 * @return 0 on success, an errno on failure.
2911 *
2912 * This helper function allows drivers to get several regulator
2913 * consumers in one operation with management, the regulators will
2914 * automatically be freed when the device is unbound. If any of the
2915 * regulators cannot be acquired then any regulators that were
2916 * allocated will be freed before returning to the caller.
2917 */
2918int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2919 struct regulator_bulk_data *consumers)
2920{
2921 int i;
2922 int ret;
2923
2924 for (i = 0; i < num_consumers; i++)
2925 consumers[i].consumer = NULL;
2926
2927 for (i = 0; i < num_consumers; i++) {
2928 consumers[i].consumer = devm_regulator_get(dev,
2929 consumers[i].supply);
2930 if (IS_ERR(consumers[i].consumer)) {
2931 ret = PTR_ERR(consumers[i].consumer);
2932 dev_err(dev, "Failed to get supply '%s': %d\n",
2933 consumers[i].supply, ret);
2934 consumers[i].consumer = NULL;
2935 goto err;
2936 }
2937 }
2938
2939 return 0;
2940
2941err:
2942 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2943 devm_regulator_put(consumers[i].consumer);
2944
2945 return ret;
2946}
2947EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2948
f21e0e81
MB		 2949static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2950{
2951 struct regulator_bulk_data *bulk = data;
2952
2953 bulk->ret = regulator_enable(bulk->consumer);
2954}
2955
414c70cb
LG		 2956/**
2957 * regulator_bulk_enable - enable multiple regulator consumers
2958 *
2959 * @num_consumers: Number of consumers
2960 * @consumers: Consumer data; clients are stored here.
2961 * @return 0 on success, an errno on failure
2962 *
2963 * This convenience API allows consumers to enable multiple regulator
2964 * clients in a single API call. If any consumers cannot be enabled
2965 * then any others that were enabled will be disabled again prior to
2966 * return.
2967 */
2968int regulator_bulk_enable(int num_consumers,
2969 struct regulator_bulk_data *consumers)
2970{
2955b47d 2971 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
414c70cb 2972 int i;
f21e0e81 2973 int ret = 0;
414c70cb 2974
6492bc1b
MB		 2975 for (i = 0; i < num_consumers; i++) {
2976 if (consumers[i].consumer->always_on)
2977 consumers[i].ret = 0;
2978 else
2979 async_schedule_domain(regulator_bulk_enable_async,
2980 &consumers[i], &async_domain);
2981 }
f21e0e81
MB		 2982
2983 async_synchronize_full_domain(&async_domain);
2984
2985 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 2986 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 2987 if (consumers[i].ret != 0) {
2988 ret = consumers[i].ret;
414c70cb 2989 goto err;
f21e0e81 2990 }
414c70cb
LG		 2991 }
2992
2993 return 0;
2994
2995err:
b29c7690
AL		 2996 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2997 while (--i >= 0)
2998 regulator_disable(consumers[i].consumer);
414c70cb
LG		 2999
3000 return ret;
3001}
3002EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3003
3004/**
3005 * regulator_bulk_disable - disable multiple regulator consumers
3006 *
3007 * @num_consumers: Number of consumers
3008 * @consumers: Consumer data; clients are stored here.
3009 * @return 0 on success, an errno on failure
3010 *
3011 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 3012 * clients in a single API call. If any consumers cannot be disabled
3013 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 3014 * return.
3015 */
3016int regulator_bulk_disable(int num_consumers,
3017 struct regulator_bulk_data *consumers)
3018{
3019 int i;
01e86f49 3020 int ret, r;
414c70cb 3021
49e22632 3022 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 3023 ret = regulator_disable(consumers[i].consumer);
3024 if (ret != 0)
3025 goto err;
3026 }
3027
3028 return 0;
3029
3030err:
5da84fd9 3031 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
01e86f49
MB		 3032 for (++i; i < num_consumers; ++i) {
3033 r = regulator_enable(consumers[i].consumer);
3034 if (r != 0)
3035 pr_err("Failed to reename %s: %d\n",
3036 consumers[i].supply, r);
3037 }
414c70cb
LG		 3038
3039 return ret;
3040}
3041EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3042
e1de2f42
DK		 3043/**
3044 * regulator_bulk_force_disable - force disable multiple regulator consumers
3045 *
3046 * @num_consumers: Number of consumers
3047 * @consumers: Consumer data; clients are stored here.
3048 * @return 0 on success, an errno on failure
3049 *
3050 * This convenience API allows consumers to forcibly disable multiple regulator
3051 * clients in a single API call.
3052 * NOTE: This should be used for situations when device damage will
3053 * likely occur if the regulators are not disabled (e.g. over temp).
3054 * Although regulator_force_disable function call for some consumers can
3055 * return error numbers, the function is called for all consumers.
3056 */
3057int regulator_bulk_force_disable(int num_consumers,
3058 struct regulator_bulk_data *consumers)
3059{
3060 int i;
3061 int ret;
3062
3063 for (i = 0; i < num_consumers; i++)
3064 consumers[i].ret =
3065 regulator_force_disable(consumers[i].consumer);
3066
3067 for (i = 0; i < num_consumers; i++) {
3068 if (consumers[i].ret != 0) {
3069 ret = consumers[i].ret;
3070 goto out;
3071 }
3072 }
3073
3074 return 0;
3075out:
3076 return ret;
3077}
3078EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3079
414c70cb
LG		 3080/**
3081 * regulator_bulk_free - free multiple regulator consumers
3082 *
3083 * @num_consumers: Number of consumers
3084 * @consumers: Consumer data; clients are stored here.
3085 *
3086 * This convenience API allows consumers to free multiple regulator
3087 * clients in a single API call.
3088 */
3089void regulator_bulk_free(int num_consumers,
3090 struct regulator_bulk_data *consumers)
3091{
3092 int i;
3093
3094 for (i = 0; i < num_consumers; i++) {
3095 regulator_put(consumers[i].consumer);
3096 consumers[i].consumer = NULL;
3097 }
3098}
3099EXPORT_SYMBOL_GPL(regulator_bulk_free);
3100
3101/**
3102 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 3103 * @rdev: regulator source
414c70cb 3104 * @event: notifier block
69279fb9 3105 * @data: callback-specific data.
414c70cb
LG		 3106 *
3107 * Called by regulator drivers to notify clients a regulator event has
3108 * occurred. We also notify regulator clients downstream.
b136fb44 3109 * Note lock must be held by caller.
414c70cb
LG		 3110 */
3111int regulator_notifier_call_chain(struct regulator_dev *rdev,
3112 unsigned long event, void *data)
3113{
3114 _notifier_call_chain(rdev, event, data);
3115 return NOTIFY_DONE;
3116
3117}
3118EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3119
be721979
MB		 3120/**
3121 * regulator_mode_to_status - convert a regulator mode into a status
3122 *
3123 * @mode: Mode to convert
3124 *
3125 * Convert a regulator mode into a status.
3126 */
3127int regulator_mode_to_status(unsigned int mode)
3128{
3129 switch (mode) {
3130 case REGULATOR_MODE_FAST:
3131 return REGULATOR_STATUS_FAST;
3132 case REGULATOR_MODE_NORMAL:
3133 return REGULATOR_STATUS_NORMAL;
3134 case REGULATOR_MODE_IDLE:
3135 return REGULATOR_STATUS_IDLE;
03ffcf3d 3136 case REGULATOR_MODE_STANDBY:
be721979
MB		 3137 return REGULATOR_STATUS_STANDBY;
3138 default:
1beaf762 3139 return REGULATOR_STATUS_UNDEFINED;
be721979
MB		 3140 }
3141}
3142EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3143
7ad68e2f
DB		 3144/*
3145 * To avoid cluttering sysfs (and memory) with useless state, only
3146 * create attributes that can be meaningfully displayed.
3147 */
3148static int add_regulator_attributes(struct regulator_dev *rdev)
3149{
3150 struct device *dev = &rdev->dev;
3151 struct regulator_ops *ops = rdev->desc->ops;
3152 int status = 0;
3153
3154 /* some attributes need specific methods to be displayed */
4c78899b 3155 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
f2889e65
MB		 3156 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3157 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) {
7ad68e2f
DB		 3158 status = device_create_file(dev, &dev_attr_microvolts);
3159 if (status < 0)
3160 return status;
3161 }
3162 if (ops->get_current_limit) {
3163 status = device_create_file(dev, &dev_attr_microamps);
3164 if (status < 0)
3165 return status;
3166 }
3167 if (ops->get_mode) {
3168 status = device_create_file(dev, &dev_attr_opmode);
3169 if (status < 0)
3170 return status;
3171 }
3172 if (ops->is_enabled) {
3173 status = device_create_file(dev, &dev_attr_state);
3174 if (status < 0)
3175 return status;
3176 }
853116a1
DB		 3177 if (ops->get_status) {
3178 status = device_create_file(dev, &dev_attr_status);
3179 if (status < 0)
3180 return status;
3181 }
f59c8f9f
MB		 3182 if (ops->get_bypass) {
3183 status = device_create_file(dev, &dev_attr_bypass);
3184 if (status < 0)
3185 return status;
3186 }
7ad68e2f
DB		 3187
3188 /* some attributes are type-specific */
3189 if (rdev->desc->type == REGULATOR_CURRENT) {
3190 status = device_create_file(dev, &dev_attr_requested_microamps);
3191 if (status < 0)
3192 return status;
3193 }
3194
3195 /* all the other attributes exist to support constraints;
3196 * don't show them if there are no constraints, or if the
3197 * relevant supporting methods are missing.
3198 */
3199 if (!rdev->constraints)
3200 return status;
3201
3202 /* constraints need specific supporting methods */
e8eef82b 3203 if (ops->set_voltage || ops->set_voltage_sel) {
7ad68e2f
DB		 3204 status = device_create_file(dev, &dev_attr_min_microvolts);
3205 if (status < 0)
3206 return status;
3207 status = device_create_file(dev, &dev_attr_max_microvolts);
3208 if (status < 0)
3209 return status;
3210 }
3211 if (ops->set_current_limit) {
3212 status = device_create_file(dev, &dev_attr_min_microamps);
3213 if (status < 0)
3214 return status;
3215 status = device_create_file(dev, &dev_attr_max_microamps);
3216 if (status < 0)
3217 return status;
3218 }
3219
7ad68e2f
DB		 3220 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3221 if (status < 0)
3222 return status;
3223 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3224 if (status < 0)
3225 return status;
3226 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3227 if (status < 0)
3228 return status;
3229
3230 if (ops->set_suspend_voltage) {
3231 status = device_create_file(dev,
3232 &dev_attr_suspend_standby_microvolts);
3233 if (status < 0)
3234 return status;
3235 status = device_create_file(dev,
3236 &dev_attr_suspend_mem_microvolts);
3237 if (status < 0)
3238 return status;
3239 status = device_create_file(dev,
3240 &dev_attr_suspend_disk_microvolts);
3241 if (status < 0)
3242 return status;
3243 }
3244
3245 if (ops->set_suspend_mode) {
3246 status = device_create_file(dev,
3247 &dev_attr_suspend_standby_mode);
3248 if (status < 0)
3249 return status;
3250 status = device_create_file(dev,
3251 &dev_attr_suspend_mem_mode);
3252 if (status < 0)
3253 return status;
3254 status = device_create_file(dev,
3255 &dev_attr_suspend_disk_mode);
3256 if (status < 0)
3257 return status;
3258 }
3259
3260 return status;
3261}
3262
1130e5b3
MB		 3263static void rdev_init_debugfs(struct regulator_dev *rdev)
3264{
1130e5b3 3265 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
24751434 3266 if (!rdev->debugfs) {
1130e5b3 3267 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 3268 return;
3269 }
3270
3271 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3272 &rdev->use_count);
3273 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3274 &rdev->open_count);
f59c8f9f
MB		 3275 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3276 &rdev->bypass_count);
1130e5b3
MB		 3277}
3278
414c70cb
LG		 3279/**
3280 * regulator_register - register regulator
69279fb9 3281 * @regulator_desc: regulator to register
c172708d 3282 * @config: runtime configuration for regulator
414c70cb
LG		 3283 *
3284 * Called by regulator drivers to register a regulator.
3285 * Returns 0 on success.
3286 */
65f26846
MB		 3287struct regulator_dev *
3288regulator_register(const struct regulator_desc *regulator_desc,
c172708d 3289 const struct regulator_config *config)
414c70cb 3290{
9a8f5e07 3291 const struct regulation_constraints *constraints = NULL;
c172708d 3292 const struct regulator_init_data *init_data;
414c70cb
LG		 3293 static atomic_t regulator_no = ATOMIC_INIT(0);
3294 struct regulator_dev *rdev;
32c8fad4 3295 struct device *dev;
a5766f11 3296 int ret, i;
69511a45 3297 const char *supply = NULL;
414c70cb 3298
c172708d 3299 if (regulator_desc == NULL || config == NULL)
414c70cb
LG		 3300 return ERR_PTR(-EINVAL);
3301
32c8fad4 3302 dev = config->dev;
dcf70112 3303 WARN_ON(!dev);
32c8fad4 3304
414c70cb
LG		 3305 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3306 return ERR_PTR(-EINVAL);
3307
cd78dfc6
DL		 3308 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3309 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 3310 return ERR_PTR(-EINVAL);
3311
476c2d83
MB		 3312 /* Only one of each should be implemented */
3313 WARN_ON(regulator_desc->ops->get_voltage &&
3314 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 3315 WARN_ON(regulator_desc->ops->set_voltage &&
3316 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 3317
3318 /* If we're using selectors we must implement list_voltage. */
3319 if (regulator_desc->ops->get_voltage_sel &&
3320 !regulator_desc->ops->list_voltage) {
3321 return ERR_PTR(-EINVAL);
3322 }
e8eef82b
MB		 3323 if (regulator_desc->ops->set_voltage_sel &&
3324 !regulator_desc->ops->list_voltage) {
3325 return ERR_PTR(-EINVAL);
3326 }
476c2d83 3327
c172708d
MB		 3328 init_data = config->init_data;
3329
414c70cb
LG		 3330 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3331 if (rdev == NULL)
3332 return ERR_PTR(-ENOMEM);
3333
3334 mutex_lock(&regulator_list_mutex);
3335
3336 mutex_init(&rdev->mutex);
c172708d 3337 rdev->reg_data = config->driver_data;
414c70cb
LG		 3338 rdev->owner = regulator_desc->owner;
3339 rdev->desc = regulator_desc;
3a4b0a07
MB		 3340 if (config->regmap)
3341 rdev->regmap = config->regmap;
52b84dac 3342 else if (dev_get_regmap(dev, NULL))
3a4b0a07 3343 rdev->regmap = dev_get_regmap(dev, NULL);
52b84dac
AC		 3344 else if (dev->parent)
3345 rdev->regmap = dev_get_regmap(dev->parent, NULL);
414c70cb 3346 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 3347 INIT_LIST_HEAD(&rdev->list);
414c70cb 3348 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 3349 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 3350
a5766f11 3351 /* preform any regulator specific init */
9a8f5e07 3352 if (init_data && init_data->regulator_init) {
a5766f11 3353 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 3354 if (ret < 0)
3355 goto clean;
a5766f11
LG		 3356 }
3357
a5766f11 3358 /* register with sysfs */
414c70cb 3359 rdev->dev.class = &regulator_class;
c172708d 3360 rdev->dev.of_node = config->of_node;
a5766f11 3361 rdev->dev.parent = dev;
812460a9
KS		 3362 dev_set_name(&rdev->dev, "regulator.%d",
3363 atomic_inc_return(&regulator_no) - 1);
a5766f11 3364 ret = device_register(&rdev->dev);
ad7725cb
VK		 3365 if (ret != 0) {
3366 put_device(&rdev->dev);
4fca9545 3367 goto clean;
ad7725cb 3368 }
a5766f11
LG		 3369
3370 dev_set_drvdata(&rdev->dev, rdev);
3371
b2a1ef47 3372 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
65f73508
MB		 3373 ret = gpio_request_one(config->ena_gpio,
3374 GPIOF_DIR_OUT | config->ena_gpio_flags,
3375 rdev_get_name(rdev));
3376 if (ret != 0) {
3377 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3378 config->ena_gpio, ret);
b2da55d9 3379 goto wash;
65f73508
MB		 3380 }
3381
3382 rdev->ena_gpio = config->ena_gpio;
3383 rdev->ena_gpio_invert = config->ena_gpio_invert;
3384
3385 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3386 rdev->ena_gpio_state = 1;
3387
3388 if (rdev->ena_gpio_invert)
3389 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3390 }
3391
74f544c1 3392 /* set regulator constraints */
9a8f5e07
MB		 3393 if (init_data)
3394 constraints = &init_data->constraints;
3395
3396 ret = set_machine_constraints(rdev, constraints);
74f544c1
MR		 3397 if (ret < 0)
3398 goto scrub;
3399
7ad68e2f
DB		 3400 /* add attributes supported by this regulator */
3401 ret = add_regulator_attributes(rdev);
3402 if (ret < 0)
3403 goto scrub;
3404
9a8f5e07 3405 if (init_data && init_data->supply_regulator)
69511a45
RN		 3406 supply = init_data->supply_regulator;
3407 else if (regulator_desc->supply_name)
3408 supply = regulator_desc->supply_name;
3409
3410 if (supply) {
0178f3e2 3411 struct regulator_dev *r;
0178f3e2 3412
6d191a5f 3413 r = regulator_dev_lookup(dev, supply, &ret);
0178f3e2 3414
69511a45
RN		 3415 if (!r) {
3416 dev_err(dev, "Failed to find supply %s\n", supply);
04bf3011 3417 ret = -EPROBE_DEFER;
0178f3e2
MB		 3418 goto scrub;
3419 }
3420
3421 ret = set_supply(rdev, r);
3422 if (ret < 0)
3423 goto scrub;
b2296bd4
LD		 3424
3425 /* Enable supply if rail is enabled */
b1a86831 3426 if (_regulator_is_enabled(rdev)) {
b2296bd4
LD		 3427 ret = regulator_enable(rdev->supply);
3428 if (ret < 0)
3429 goto scrub;
3430 }
0178f3e2
MB		 3431 }
3432
a5766f11 3433 /* add consumers devices */
9a8f5e07
MB		 3434 if (init_data) {
3435 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3436 ret = set_consumer_device_supply(rdev,
9a8f5e07 3437 init_data->consumer_supplies[i].dev_name,
23c2f041 3438 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 3439 if (ret < 0) {
3440 dev_err(dev, "Failed to set supply %s\n",
3441 init_data->consumer_supplies[i].supply);
3442 goto unset_supplies;
3443 }
23c2f041 3444 }
414c70cb 3445 }
a5766f11
LG		 3446
3447 list_add(&rdev->list, &regulator_list);
1130e5b3
MB		 3448
3449 rdev_init_debugfs(rdev);
a5766f11 3450out:
414c70cb
LG		 3451 mutex_unlock(&regulator_list_mutex);
3452 return rdev;
4fca9545 3453
d4033b54
JN		 3454unset_supplies:
3455 unset_regulator_supplies(rdev);
3456
4fca9545 3457scrub:
e81dba85 3458 if (rdev->supply)
23ff2f0f 3459 _regulator_put(rdev->supply);
65f73508
MB		 3460 if (rdev->ena_gpio)
3461 gpio_free(rdev->ena_gpio);
1a6958e7 3462 kfree(rdev->constraints);
b2da55d9 3463wash:
4fca9545 3464 device_unregister(&rdev->dev);
53032daf
PW		 3465 /* device core frees rdev */
3466 rdev = ERR_PTR(ret);
3467 goto out;
3468
4fca9545
DB		 3469clean:
3470 kfree(rdev);
3471 rdev = ERR_PTR(ret);
3472 goto out;
414c70cb
LG		 3473}
3474EXPORT_SYMBOL_GPL(regulator_register);
3475
3476/**
3477 * regulator_unregister - unregister regulator
69279fb9 3478 * @rdev: regulator to unregister
414c70cb
LG		 3479 *
3480 * Called by regulator drivers to unregister a regulator.
3481 */
3482void regulator_unregister(struct regulator_dev *rdev)
3483{
3484 if (rdev == NULL)
3485 return;
3486
e032b376
MB		 3487 if (rdev->supply)
3488 regulator_put(rdev->supply);
414c70cb 3489 mutex_lock(&regulator_list_mutex);
1130e5b3 3490 debugfs_remove_recursive(rdev->debugfs);
43829731 3491 flush_work(&rdev->disable_work.work);
6bf87d17 3492 WARN_ON(rdev->open_count);
0f1d747b 3493 unset_regulator_supplies(rdev);
414c70cb 3494 list_del(&rdev->list);
f8c12fe3 3495 kfree(rdev->constraints);
65f73508
MB		 3496 if (rdev->ena_gpio)
3497 gpio_free(rdev->ena_gpio);
58fb5cf5 3498 device_unregister(&rdev->dev);
414c70cb
LG		 3499 mutex_unlock(&regulator_list_mutex);
3500}
3501EXPORT_SYMBOL_GPL(regulator_unregister);
3502
414c70cb 3503/**
cf7bbcdf 3504 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 3505 * @state: system suspend state
3506 *
3507 * Configure each regulator with it's suspend operating parameters for state.
3508 * This will usually be called by machine suspend code prior to supending.
3509 */
3510int regulator_suspend_prepare(suspend_state_t state)
3511{
3512 struct regulator_dev *rdev;
3513 int ret = 0;
3514
3515 /* ON is handled by regulator active state */
3516 if (state == PM_SUSPEND_ON)
3517 return -EINVAL;
3518
3519 mutex_lock(&regulator_list_mutex);
3520 list_for_each_entry(rdev, &regulator_list, list) {
3521
3522 mutex_lock(&rdev->mutex);
3523 ret = suspend_prepare(rdev, state);
3524 mutex_unlock(&rdev->mutex);
3525
3526 if (ret < 0) {
5da84fd9 3527 rdev_err(rdev, "failed to prepare\n");
414c70cb
LG		 3528 goto out;
3529 }
3530 }
3531out:
3532 mutex_unlock(&regulator_list_mutex);
3533 return ret;
3534}
3535EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3536
7a32b589
MH		 3537/**
3538 * regulator_suspend_finish - resume regulators from system wide suspend
3539 *
3540 * Turn on regulators that might be turned off by regulator_suspend_prepare
3541 * and that should be turned on according to the regulators properties.
3542 */
3543int regulator_suspend_finish(void)
3544{
3545 struct regulator_dev *rdev;
3546 int ret = 0, error;
3547
3548 mutex_lock(&regulator_list_mutex);
3549 list_for_each_entry(rdev, &regulator_list, list) {
3550 struct regulator_ops *ops = rdev->desc->ops;
3551
3552 mutex_lock(&rdev->mutex);
3553 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3554 ops->enable) {
3555 error = ops->enable(rdev);
3556 if (error)
3557 ret = error;
3558 } else {
3559 if (!has_full_constraints)
3560 goto unlock;
3561 if (!ops->disable)
3562 goto unlock;
b1a86831 3563 if (!_regulator_is_enabled(rdev))
7a32b589
MH		 3564 goto unlock;
3565
3566 error = ops->disable(rdev);
3567 if (error)
3568 ret = error;
3569 }
3570unlock:
3571 mutex_unlock(&rdev->mutex);
3572 }
3573 mutex_unlock(&regulator_list_mutex);
3574 return ret;
3575}
3576EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3577
ca725561
MB		 3578/**
3579 * regulator_has_full_constraints - the system has fully specified constraints
3580 *
3581 * Calling this function will cause the regulator API to disable all
3582 * regulators which have a zero use count and don't have an always_on
3583 * constraint in a late_initcall.
3584 *
3585 * The intention is that this will become the default behaviour in a
3586 * future kernel release so users are encouraged to use this facility
3587 * now.
3588 */
3589void regulator_has_full_constraints(void)
3590{
3591 has_full_constraints = 1;
3592}
3593EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3594
688fe99a
MB		 3595/**
3596 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3597 *
3598 * Calling this function will cause the regulator API to provide a
3599 * dummy regulator to consumers if no physical regulator is found,
3600 * allowing most consumers to proceed as though a regulator were
3601 * configured. This allows systems such as those with software
3602 * controllable regulators for the CPU core only to be brought up more
3603 * readily.
3604 */
3605void regulator_use_dummy_regulator(void)
3606{
3607 board_wants_dummy_regulator = true;
3608}
3609EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3610
414c70cb
LG		 3611/**
3612 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 3613 * @rdev: regulator
414c70cb
LG		 3614 *
3615 * Get rdev regulator driver private data. This call can be used in the
3616 * regulator driver context.
3617 */
3618void *rdev_get_drvdata(struct regulator_dev *rdev)
3619{
3620 return rdev->reg_data;
3621}
3622EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3623
3624/**
3625 * regulator_get_drvdata - get regulator driver data
3626 * @regulator: regulator
3627 *
3628 * Get regulator driver private data. This call can be used in the consumer
3629 * driver context when non API regulator specific functions need to be called.
3630 */
3631void *regulator_get_drvdata(struct regulator *regulator)
3632{
3633 return regulator->rdev->reg_data;
3634}
3635EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3636
3637/**
3638 * regulator_set_drvdata - set regulator driver data
3639 * @regulator: regulator
3640 * @data: data
3641 */
3642void regulator_set_drvdata(struct regulator *regulator, void *data)
3643{
3644 regulator->rdev->reg_data = data;
3645}
3646EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3647
3648/**
3649 * regulator_get_id - get regulator ID
69279fb9 3650 * @rdev: regulator
414c70cb
LG		 3651 */
3652int rdev_get_id(struct regulator_dev *rdev)
3653{
3654 return rdev->desc->id;
3655}
3656EXPORT_SYMBOL_GPL(rdev_get_id);
3657
a5766f11
LG		 3658struct device *rdev_get_dev(struct regulator_dev *rdev)
3659{
3660 return &rdev->dev;
3661}
3662EXPORT_SYMBOL_GPL(rdev_get_dev);
3663
3664void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3665{
3666 return reg_init_data->driver_data;
3667}
3668EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3669
ba55a974
MB		 3670#ifdef CONFIG_DEBUG_FS
3671static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3672 size_t count, loff_t *ppos)
3673{
3674 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3675 ssize_t len, ret = 0;
3676 struct regulator_map *map;
3677
3678 if (!buf)
3679 return -ENOMEM;
3680
3681 list_for_each_entry(map, &regulator_map_list, list) {
3682 len = snprintf(buf + ret, PAGE_SIZE - ret,
3683 "%s -> %s.%s\n",
3684 rdev_get_name(map->regulator), map->dev_name,
3685 map->supply);
3686 if (len >= 0)
3687 ret += len;
3688 if (ret > PAGE_SIZE) {
3689 ret = PAGE_SIZE;
3690 break;
3691 }
3692 }
3693
3694 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3695
3696 kfree(buf);
3697
3698 return ret;
3699}
24751434 3700#endif
ba55a974
MB		 3701
3702static const struct file_operations supply_map_fops = {
24751434 3703#ifdef CONFIG_DEBUG_FS
ba55a974
MB		 3704 .read = supply_map_read_file,
3705 .llseek = default_llseek,
ba55a974 3706#endif
24751434 3707};
ba55a974 3708
414c70cb
LG		 3709static int __init regulator_init(void)
3710{
34abbd68
MB		 3711 int ret;
3712
34abbd68
MB		 3713 ret = class_register(&regulator_class);
3714
1130e5b3 3715 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 3716 if (!debugfs_root)
1130e5b3 3717 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 3718
f4d562c6
MB		 3719 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3720 &supply_map_fops);
1130e5b3 3721
34abbd68
MB		 3722 regulator_dummy_init();
3723
3724 return ret;
414c70cb
LG		 3725}
3726
3727/* init early to allow our consumers to complete system booting */
3728core_initcall(regulator_init);
ca725561
MB		 3729
3730static int __init regulator_init_complete(void)
3731{
3732 struct regulator_dev *rdev;
3733 struct regulator_ops *ops;
3734 struct regulation_constraints *c;
3735 int enabled, ret;
ca725561 3736
86f5fcfc
MB		 3737 /*
3738 * Since DT doesn't provide an idiomatic mechanism for
3739 * enabling full constraints and since it's much more natural
3740 * with DT to provide them just assume that a DT enabled
3741 * system has full constraints.
3742 */
3743 if (of_have_populated_dt())
3744 has_full_constraints = true;
3745
ca725561
MB		 3746 mutex_lock(&regulator_list_mutex);
3747
3748 /* If we have a full configuration then disable any regulators
3749 * which are not in use or always_on. This will become the
3750 * default behaviour in the future.
3751 */
3752 list_for_each_entry(rdev, &regulator_list, list) {
3753 ops = rdev->desc->ops;
3754 c = rdev->constraints;
3755
f25e0b4f 3756 if (!ops->disable || (c && c->always_on))
ca725561
MB		 3757 continue;
3758
3759 mutex_lock(&rdev->mutex);
3760
3761 if (rdev->use_count)
3762 goto unlock;
3763
3764 /* If we can't read the status assume it's on. */
3765 if (ops->is_enabled)
3766 enabled = ops->is_enabled(rdev);
3767 else
3768 enabled = 1;
3769
3770 if (!enabled)
3771 goto unlock;
3772
3773 if (has_full_constraints) {
3774 /* We log since this may kill the system if it
3775 * goes wrong. */
5da84fd9 3776 rdev_info(rdev, "disabling\n");
ca725561
MB		 3777 ret = ops->disable(rdev);
3778 if (ret != 0) {
5da84fd9 3779 rdev_err(rdev, "couldn't disable: %d\n", ret);
ca725561
MB		 3780 }
3781 } else {
3782 /* The intention is that in future we will
3783 * assume that full constraints are provided
3784 * so warn even if we aren't going to do
3785 * anything here.
3786 */
5da84fd9 3787 rdev_warn(rdev, "incomplete constraints, leaving on\n");
ca725561
MB		 3788 }
3789
3790unlock:
3791 mutex_unlock(&rdev->mutex);
3792 }
3793
3794 mutex_unlock(&regulator_list_mutex);
3795
3796 return 0;
3797}
3798late_initcall(regulator_init_complete);
kernel source for telekom puls (alcatel/mediatek)