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Linux 3.5-rc1
[linux-2.6-block.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>
69511a45 26#include <linux/of.h>
65b19ce6 27#include <linux/regmap.h>
69511a45 28#include <linux/regulator/of_regulator.h>
414c70cb
LG		 29#include <linux/regulator/consumer.h>
30#include <linux/regulator/driver.h>
31#include <linux/regulator/machine.h>
65602c32 32#include <linux/module.h>
414c70cb 33
02fa3ec0
MB		 34#define CREATE_TRACE_POINTS
35#include <trace/events/regulator.h>
36
34abbd68
MB		 37#include "dummy.h"
38
7d51a0db
MB		 39#define rdev_crit(rdev, fmt, ...) \
40 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
5da84fd9
JP		 41#define rdev_err(rdev, fmt, ...) \
42 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
43#define rdev_warn(rdev, fmt, ...) \
44 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
45#define rdev_info(rdev, fmt, ...) \
46 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
47#define rdev_dbg(rdev, fmt, ...) \
48 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
49
414c70cb
LG		 50static DEFINE_MUTEX(regulator_list_mutex);
51static LIST_HEAD(regulator_list);
52static LIST_HEAD(regulator_map_list);
21cf891a 53static bool has_full_constraints;
688fe99a 54static bool board_wants_dummy_regulator;
414c70cb 55
1130e5b3 56static struct dentry *debugfs_root;
1130e5b3 57
8dc5390d 58/*
414c70cb
LG		 59 * struct regulator_map
60 *
61 * Used to provide symbolic supply names to devices.
62 */
63struct regulator_map {
64 struct list_head list;
40f9244f 65 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 66 const char *supply;
a5766f11 67 struct regulator_dev *regulator;
414c70cb
LG		 68};
69
414c70cb
LG		 70/*
71 * struct regulator
72 *
73 * One for each consumer device.
74 */
75struct regulator {
76 struct device *dev;
77 struct list_head list;
6492bc1b 78 unsigned int always_on:1;
414c70cb
LG		 79 int uA_load;
80 int min_uV;
81 int max_uV;
414c70cb
LG		 82 char *supply_name;
83 struct device_attribute dev_attr;
84 struct regulator_dev *rdev;
5de70519 85 struct dentry *debugfs;
414c70cb
LG		 86};
87
88static int _regulator_is_enabled(struct regulator_dev *rdev);
3801b86a 89static int _regulator_disable(struct regulator_dev *rdev);
414c70cb
LG		 90static int _regulator_get_voltage(struct regulator_dev *rdev);
91static int _regulator_get_current_limit(struct regulator_dev *rdev);
92static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
93static void _notifier_call_chain(struct regulator_dev *rdev,
94 unsigned long event, void *data);
75790251
MB		 95static int _regulator_do_set_voltage(struct regulator_dev *rdev,
96 int min_uV, int max_uV);
3801b86a
MB		 97static struct regulator *create_regulator(struct regulator_dev *rdev,
98 struct device *dev,
99 const char *supply_name);
414c70cb 100
1083c393
MB		 101static const char *rdev_get_name(struct regulator_dev *rdev)
102{
103 if (rdev->constraints && rdev->constraints->name)
104 return rdev->constraints->name;
105 else if (rdev->desc->name)
106 return rdev->desc->name;
107 else
108 return "";
109}
110
414c70cb
LG		 111/* gets the regulator for a given consumer device */
112static struct regulator *get_device_regulator(struct device *dev)
113{
114 struct regulator *regulator = NULL;
115 struct regulator_dev *rdev;
116
117 mutex_lock(&regulator_list_mutex);
118 list_for_each_entry(rdev, &regulator_list, list) {
119 mutex_lock(&rdev->mutex);
120 list_for_each_entry(regulator, &rdev->consumer_list, list) {
121 if (regulator->dev == dev) {
122 mutex_unlock(&rdev->mutex);
123 mutex_unlock(&regulator_list_mutex);
124 return regulator;
125 }
126 }
127 mutex_unlock(&rdev->mutex);
128 }
129 mutex_unlock(&regulator_list_mutex);
130 return NULL;
131}
132
69511a45
RN		 133/**
134 * of_get_regulator - get a regulator device node based on supply name
135 * @dev: Device pointer for the consumer (of regulator) device
136 * @supply: regulator supply name
137 *
138 * Extract the regulator device node corresponding to the supply name.
139 * retruns the device node corresponding to the regulator if found, else
140 * returns NULL.
141 */
142static struct device_node *of_get_regulator(struct device *dev, const char *supply)
143{
144 struct device_node *regnode = NULL;
145 char prop_name[32]; /* 32 is max size of property name */
146
147 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
148
149 snprintf(prop_name, 32, "%s-supply", supply);
150 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
151
152 if (!regnode) {
16fbcc3b 153 dev_dbg(dev, "Looking up %s property in node %s failed",
69511a45
RN		 154 prop_name, dev->of_node->full_name);
155 return NULL;
156 }
157 return regnode;
158}
159
6492bc1b
MB		 160static int _regulator_can_change_status(struct regulator_dev *rdev)
161{
162 if (!rdev->constraints)
163 return 0;
164
165 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
166 return 1;
167 else
168 return 0;
169}
170
414c70cb
LG		 171/* Platform voltage constraint check */
172static int regulator_check_voltage(struct regulator_dev *rdev,
173 int *min_uV, int *max_uV)
174{
175 BUG_ON(*min_uV > *max_uV);
176
177 if (!rdev->constraints) {
5da84fd9 178 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 179 return -ENODEV;
180 }
181 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
5da84fd9 182 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 183 return -EPERM;
184 }
185
186 if (*max_uV > rdev->constraints->max_uV)
187 *max_uV = rdev->constraints->max_uV;
188 if (*min_uV < rdev->constraints->min_uV)
189 *min_uV = rdev->constraints->min_uV;
190
89f425ed
MB		 191 if (*min_uV > *max_uV) {
192 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 193 *min_uV, *max_uV);
414c70cb 194 return -EINVAL;
89f425ed 195 }
414c70cb
LG		 196
197 return 0;
198}
199
05fda3b1
TP		 200/* Make sure we select a voltage that suits the needs of all
201 * regulator consumers
202 */
203static int regulator_check_consumers(struct regulator_dev *rdev,
204 int *min_uV, int *max_uV)
205{
206 struct regulator *regulator;
207
208 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4aa922c0
MB		 209 /*
210 * Assume consumers that didn't say anything are OK
211 * with anything in the constraint range.
212 */
213 if (!regulator->min_uV && !regulator->max_uV)
214 continue;
215
05fda3b1
TP		 216 if (*max_uV > regulator->max_uV)
217 *max_uV = regulator->max_uV;
218 if (*min_uV < regulator->min_uV)
219 *min_uV = regulator->min_uV;
220 }
221
222 if (*min_uV > *max_uV)
223 return -EINVAL;
224
225 return 0;
226}
227
414c70cb
LG		 228/* current constraint check */
229static int regulator_check_current_limit(struct regulator_dev *rdev,
230 int *min_uA, int *max_uA)
231{
232 BUG_ON(*min_uA > *max_uA);
233
234 if (!rdev->constraints) {
5da84fd9 235 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 236 return -ENODEV;
237 }
238 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
5da84fd9 239 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 240 return -EPERM;
241 }
242
243 if (*max_uA > rdev->constraints->max_uA)
244 *max_uA = rdev->constraints->max_uA;
245 if (*min_uA < rdev->constraints->min_uA)
246 *min_uA = rdev->constraints->min_uA;
247
89f425ed
MB		 248 if (*min_uA > *max_uA) {
249 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 250 *min_uA, *max_uA);
414c70cb 251 return -EINVAL;
89f425ed 252 }
414c70cb
LG		 253
254 return 0;
255}
256
257/* operating mode constraint check */
2c608234 258static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 259{
2c608234 260 switch (*mode) {
e573520b
DB		 261 case REGULATOR_MODE_FAST:
262 case REGULATOR_MODE_NORMAL:
263 case REGULATOR_MODE_IDLE:
264 case REGULATOR_MODE_STANDBY:
265 break;
266 default:
89f425ed 267 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 268 return -EINVAL;
269 }
270
414c70cb 271 if (!rdev->constraints) {
5da84fd9 272 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 273 return -ENODEV;
274 }
275 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
5da84fd9 276 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 277 return -EPERM;
278 }
2c608234
MB		 279
280 /* The modes are bitmasks, the most power hungry modes having
281 * the lowest values. If the requested mode isn't supported
282 * try higher modes. */
283 while (*mode) {
284 if (rdev->constraints->valid_modes_mask & *mode)
285 return 0;
286 *mode /= 2;
414c70cb 287 }
2c608234
MB		 288
289 return -EINVAL;
414c70cb
LG		 290}
291
292/* dynamic regulator mode switching constraint check */
293static int regulator_check_drms(struct regulator_dev *rdev)
294{
295 if (!rdev->constraints) {
5da84fd9 296 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 297 return -ENODEV;
298 }
299 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
5da84fd9 300 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 301 return -EPERM;
302 }
303 return 0;
304}
305
306static ssize_t device_requested_uA_show(struct device *dev,
307 struct device_attribute *attr, char *buf)
308{
309 struct regulator *regulator;
310
311 regulator = get_device_regulator(dev);
312 if (regulator == NULL)
313 return 0;
314
315 return sprintf(buf, "%d\n", regulator->uA_load);
316}
317
318static ssize_t regulator_uV_show(struct device *dev,
319 struct device_attribute *attr, char *buf)
320{
a5766f11 321 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 322 ssize_t ret;
323
324 mutex_lock(&rdev->mutex);
325 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
326 mutex_unlock(&rdev->mutex);
327
328 return ret;
329}
7ad68e2f 330static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 331
332static ssize_t regulator_uA_show(struct device *dev,
333 struct device_attribute *attr, char *buf)
334{
a5766f11 335 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 336
337 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
338}
7ad68e2f 339static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 340
bc558a60
MB		 341static ssize_t regulator_name_show(struct device *dev,
342 struct device_attribute *attr, char *buf)
343{
344 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 345
1083c393 346 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60
MB		 347}
348
4fca9545 349static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 350{
414c70cb
LG		 351 switch (mode) {
352 case REGULATOR_MODE_FAST:
353 return sprintf(buf, "fast\n");
354 case REGULATOR_MODE_NORMAL:
355 return sprintf(buf, "normal\n");
356 case REGULATOR_MODE_IDLE:
357 return sprintf(buf, "idle\n");
358 case REGULATOR_MODE_STANDBY:
359 return sprintf(buf, "standby\n");
360 }
361 return sprintf(buf, "unknown\n");
362}
363
4fca9545
DB		 364static ssize_t regulator_opmode_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
414c70cb 366{
a5766f11 367 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 368
4fca9545
DB		 369 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
370}
7ad68e2f 371static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 372
373static ssize_t regulator_print_state(char *buf, int state)
374{
414c70cb
LG		 375 if (state > 0)
376 return sprintf(buf, "enabled\n");
377 else if (state == 0)
378 return sprintf(buf, "disabled\n");
379 else
380 return sprintf(buf, "unknown\n");
381}
382
4fca9545
DB		 383static ssize_t regulator_state_show(struct device *dev,
384 struct device_attribute *attr, char *buf)
385{
386 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 387 ssize_t ret;
388
389 mutex_lock(&rdev->mutex);
390 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
391 mutex_unlock(&rdev->mutex);
4fca9545 392
9332546f 393 return ret;
4fca9545 394}
7ad68e2f 395static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 396
853116a1
DB		 397static ssize_t regulator_status_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
399{
400 struct regulator_dev *rdev = dev_get_drvdata(dev);
401 int status;
402 char *label;
403
404 status = rdev->desc->ops->get_status(rdev);
405 if (status < 0)
406 return status;
407
408 switch (status) {
409 case REGULATOR_STATUS_OFF:
410 label = "off";
411 break;
412 case REGULATOR_STATUS_ON:
413 label = "on";
414 break;
415 case REGULATOR_STATUS_ERROR:
416 label = "error";
417 break;
418 case REGULATOR_STATUS_FAST:
419 label = "fast";
420 break;
421 case REGULATOR_STATUS_NORMAL:
422 label = "normal";
423 break;
424 case REGULATOR_STATUS_IDLE:
425 label = "idle";
426 break;
427 case REGULATOR_STATUS_STANDBY:
428 label = "standby";
429 break;
430 default:
431 return -ERANGE;
432 }
433
434 return sprintf(buf, "%s\n", label);
435}
436static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
437
414c70cb
LG		 438static ssize_t regulator_min_uA_show(struct device *dev,
439 struct device_attribute *attr, char *buf)
440{
a5766f11 441 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 442
443 if (!rdev->constraints)
444 return sprintf(buf, "constraint not defined\n");
445
446 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
447}
7ad68e2f 448static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 449
450static ssize_t regulator_max_uA_show(struct device *dev,
451 struct device_attribute *attr, char *buf)
452{
a5766f11 453 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 454
455 if (!rdev->constraints)
456 return sprintf(buf, "constraint not defined\n");
457
458 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
459}
7ad68e2f 460static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 461
462static ssize_t regulator_min_uV_show(struct device *dev,
463 struct device_attribute *attr, char *buf)
464{
a5766f11 465 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 466
467 if (!rdev->constraints)
468 return sprintf(buf, "constraint not defined\n");
469
470 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
471}
7ad68e2f 472static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 473
474static ssize_t regulator_max_uV_show(struct device *dev,
475 struct device_attribute *attr, char *buf)
476{
a5766f11 477 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 478
479 if (!rdev->constraints)
480 return sprintf(buf, "constraint not defined\n");
481
482 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
483}
7ad68e2f 484static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 485
486static ssize_t regulator_total_uA_show(struct device *dev,
487 struct device_attribute *attr, char *buf)
488{
a5766f11 489 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 490 struct regulator *regulator;
491 int uA = 0;
492
493 mutex_lock(&rdev->mutex);
494 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 495 uA += regulator->uA_load;
414c70cb
LG		 496 mutex_unlock(&rdev->mutex);
497 return sprintf(buf, "%d\n", uA);
498}
7ad68e2f 499static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb
LG		 500
501static ssize_t regulator_num_users_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
503{
a5766f11 504 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 505 return sprintf(buf, "%d\n", rdev->use_count);
506}
507
508static ssize_t regulator_type_show(struct device *dev,
509 struct device_attribute *attr, char *buf)
510{
a5766f11 511 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 512
513 switch (rdev->desc->type) {
514 case REGULATOR_VOLTAGE:
515 return sprintf(buf, "voltage\n");
516 case REGULATOR_CURRENT:
517 return sprintf(buf, "current\n");
518 }
519 return sprintf(buf, "unknown\n");
520}
521
522static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
523 struct device_attribute *attr, char *buf)
524{
a5766f11 525 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 526
414c70cb
LG		 527 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
528}
7ad68e2f
DB		 529static DEVICE_ATTR(suspend_mem_microvolts, 0444,
530 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 531
532static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
533 struct device_attribute *attr, char *buf)
534{
a5766f11 535 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 536
414c70cb
LG		 537 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
538}
7ad68e2f
DB		 539static DEVICE_ATTR(suspend_disk_microvolts, 0444,
540 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 541
542static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
543 struct device_attribute *attr, char *buf)
544{
a5766f11 545 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 546
414c70cb
LG		 547 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
548}
7ad68e2f
DB		 549static DEVICE_ATTR(suspend_standby_microvolts, 0444,
550 regulator_suspend_standby_uV_show, NULL);
414c70cb 551
414c70cb
LG		 552static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
553 struct device_attribute *attr, char *buf)
554{
a5766f11 555 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 556
4fca9545
DB		 557 return regulator_print_opmode(buf,
558 rdev->constraints->state_mem.mode);
414c70cb 559}
7ad68e2f
DB		 560static DEVICE_ATTR(suspend_mem_mode, 0444,
561 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 562
563static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
564 struct device_attribute *attr, char *buf)
565{
a5766f11 566 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 567
4fca9545
DB		 568 return regulator_print_opmode(buf,
569 rdev->constraints->state_disk.mode);
414c70cb 570}
7ad68e2f
DB		 571static DEVICE_ATTR(suspend_disk_mode, 0444,
572 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 573
574static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
575 struct device_attribute *attr, char *buf)
576{
a5766f11 577 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 578
4fca9545
DB		 579 return regulator_print_opmode(buf,
580 rdev->constraints->state_standby.mode);
414c70cb 581}
7ad68e2f
DB		 582static DEVICE_ATTR(suspend_standby_mode, 0444,
583 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 584
585static ssize_t regulator_suspend_mem_state_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
587{
a5766f11 588 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 589
4fca9545
DB		 590 return regulator_print_state(buf,
591 rdev->constraints->state_mem.enabled);
414c70cb 592}
7ad68e2f
DB		 593static DEVICE_ATTR(suspend_mem_state, 0444,
594 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 595
596static ssize_t regulator_suspend_disk_state_show(struct device *dev,
597 struct device_attribute *attr, char *buf)
598{
a5766f11 599 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 600
4fca9545
DB		 601 return regulator_print_state(buf,
602 rdev->constraints->state_disk.enabled);
414c70cb 603}
7ad68e2f
DB		 604static DEVICE_ATTR(suspend_disk_state, 0444,
605 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 606
607static ssize_t regulator_suspend_standby_state_show(struct device *dev,
608 struct device_attribute *attr, char *buf)
609{
a5766f11 610 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 611
4fca9545
DB		 612 return regulator_print_state(buf,
613 rdev->constraints->state_standby.enabled);
414c70cb 614}
7ad68e2f
DB		 615static DEVICE_ATTR(suspend_standby_state, 0444,
616 regulator_suspend_standby_state_show, NULL);
617
bc558a60 618
7ad68e2f
DB		 619/*
620 * These are the only attributes are present for all regulators.
621 * Other attributes are a function of regulator functionality.
622 */
414c70cb 623static struct device_attribute regulator_dev_attrs[] = {
bc558a60 624 __ATTR(name, 0444, regulator_name_show, NULL),
414c70cb
LG		 625 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
626 __ATTR(type, 0444, regulator_type_show, NULL),
414c70cb
LG		 627 __ATTR_NULL,
628};
629
630static void regulator_dev_release(struct device *dev)
631{
a5766f11 632 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 633 kfree(rdev);
634}
635
636static struct class regulator_class = {
637 .name = "regulator",
638 .dev_release = regulator_dev_release,
639 .dev_attrs = regulator_dev_attrs,
640};
641
642/* Calculate the new optimum regulator operating mode based on the new total
643 * consumer load. All locks held by caller */
644static void drms_uA_update(struct regulator_dev *rdev)
645{
646 struct regulator *sibling;
647 int current_uA = 0, output_uV, input_uV, err;
648 unsigned int mode;
649
650 err = regulator_check_drms(rdev);
651 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
476c2d83
MB		 652 (!rdev->desc->ops->get_voltage &&
653 !rdev->desc->ops->get_voltage_sel) ||
654 !rdev->desc->ops->set_mode)
036de8ef 655 return;
414c70cb
LG		 656
657 /* get output voltage */
1bf5a1f8 658 output_uV = _regulator_get_voltage(rdev);
414c70cb
LG		 659 if (output_uV <= 0)
660 return;
661
662 /* get input voltage */
1bf5a1f8
MB		 663 input_uV = 0;
664 if (rdev->supply)
3f24f5ad 665 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 666 if (input_uV <= 0)
414c70cb
LG		 667 input_uV = rdev->constraints->input_uV;
668 if (input_uV <= 0)
669 return;
670
671 /* calc total requested load */
672 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 673 current_uA += sibling->uA_load;
414c70cb
LG		 674
675 /* now get the optimum mode for our new total regulator load */
676 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
677 output_uV, current_uA);
678
679 /* check the new mode is allowed */
2c608234 680 err = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 681 if (err == 0)
682 rdev->desc->ops->set_mode(rdev, mode);
683}
684
685static int suspend_set_state(struct regulator_dev *rdev,
686 struct regulator_state *rstate)
687{
688 int ret = 0;
638f85c5
MB		 689
690 /* If we have no suspend mode configration don't set anything;
8ac0e95d
AL		 691 * only warn if the driver implements set_suspend_voltage or
692 * set_suspend_mode callback.
638f85c5
MB		 693 */
694 if (!rstate->enabled && !rstate->disabled) {
8ac0e95d
AL		 695 if (rdev->desc->ops->set_suspend_voltage ||
696 rdev->desc->ops->set_suspend_mode)
5da84fd9 697 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 698 return 0;
699 }
700
701 if (rstate->enabled && rstate->disabled) {
5da84fd9 702 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 703 return -EINVAL;
704 }
414c70cb 705
8ac0e95d 706 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
414c70cb 707 ret = rdev->desc->ops->set_suspend_enable(rdev);
8ac0e95d 708 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
414c70cb 709 ret = rdev->desc->ops->set_suspend_disable(rdev);
8ac0e95d
AL		 710 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
711 ret = 0;
712
414c70cb 713 if (ret < 0) {
5da84fd9 714 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 715 return ret;
716 }
717
718 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
719 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
720 if (ret < 0) {
5da84fd9 721 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 722 return ret;
723 }
724 }
725
726 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
727 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
728 if (ret < 0) {
5da84fd9 729 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 730 return ret;
731 }
732 }
733 return ret;
734}
735
736/* locks held by caller */
737static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
738{
739 if (!rdev->constraints)
740 return -EINVAL;
741
742 switch (state) {
743 case PM_SUSPEND_STANDBY:
744 return suspend_set_state(rdev,
745 &rdev->constraints->state_standby);
746 case PM_SUSPEND_MEM:
747 return suspend_set_state(rdev,
748 &rdev->constraints->state_mem);
749 case PM_SUSPEND_MAX:
750 return suspend_set_state(rdev,
751 &rdev->constraints->state_disk);
752 default:
753 return -EINVAL;
754 }
755}
756
757static void print_constraints(struct regulator_dev *rdev)
758{
759 struct regulation_constraints *constraints = rdev->constraints;
973e9a27 760 char buf[80] = "";
8f031b48
MB		 761 int count = 0;
762 int ret;
414c70cb 763
8f031b48 764 if (constraints->min_uV && constraints->max_uV) {
414c70cb 765 if (constraints->min_uV == constraints->max_uV)
8f031b48
MB		 766 count += sprintf(buf + count, "%d mV ",
767 constraints->min_uV / 1000);
414c70cb 768 else
8f031b48
MB		 769 count += sprintf(buf + count, "%d <--> %d mV ",
770 constraints->min_uV / 1000,
771 constraints->max_uV / 1000);
772 }
773
774 if (!constraints->min_uV ||
775 constraints->min_uV != constraints->max_uV) {
776 ret = _regulator_get_voltage(rdev);
777 if (ret > 0)
778 count += sprintf(buf + count, "at %d mV ", ret / 1000);
779 }
780
bf5892a8
MB		 781 if (constraints->uV_offset)
782 count += sprintf(buf, "%dmV offset ",
783 constraints->uV_offset / 1000);
784
8f031b48 785 if (constraints->min_uA && constraints->max_uA) {
414c70cb 786 if (constraints->min_uA == constraints->max_uA)
8f031b48
MB		 787 count += sprintf(buf + count, "%d mA ",
788 constraints->min_uA / 1000);
414c70cb 789 else
8f031b48
MB		 790 count += sprintf(buf + count, "%d <--> %d mA ",
791 constraints->min_uA / 1000,
792 constraints->max_uA / 1000);
793 }
794
795 if (!constraints->min_uA ||
796 constraints->min_uA != constraints->max_uA) {
797 ret = _regulator_get_current_limit(rdev);
798 if (ret > 0)
e4a6376b 799 count += sprintf(buf + count, "at %d mA ", ret / 1000);
414c70cb 800 }
8f031b48 801
414c70cb
LG		 802 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
803 count += sprintf(buf + count, "fast ");
804 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
805 count += sprintf(buf + count, "normal ");
806 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
807 count += sprintf(buf + count, "idle ");
808 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
809 count += sprintf(buf + count, "standby");
810
13ce29f8 811 rdev_info(rdev, "%s\n", buf);
4a682922
MB		 812
813 if ((constraints->min_uV != constraints->max_uV) &&
814 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
815 rdev_warn(rdev,
816 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 817}
818
e79055d6 819static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 820 struct regulation_constraints *constraints)
a5766f11 821{
e5fda26c 822 struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 823 int ret;
824
825 /* do we need to apply the constraint voltage */
826 if (rdev->constraints->apply_uV &&
75790251
MB		 827 rdev->constraints->min_uV == rdev->constraints->max_uV) {
828 ret = _regulator_do_set_voltage(rdev,
829 rdev->constraints->min_uV,
830 rdev->constraints->max_uV);
831 if (ret < 0) {
832 rdev_err(rdev, "failed to apply %duV constraint\n",
833 rdev->constraints->min_uV);
75790251
MB		 834 return ret;
835 }
af5866c9 836 }
e06f5b4f 837
4367cfdc
DB		 838 /* constrain machine-level voltage specs to fit
839 * the actual range supported by this regulator.
840 */
841 if (ops->list_voltage && rdev->desc->n_voltages) {
842 int count = rdev->desc->n_voltages;
843 int i;
844 int min_uV = INT_MAX;
845 int max_uV = INT_MIN;
846 int cmin = constraints->min_uV;
847 int cmax = constraints->max_uV;
848
3e590918
MB		 849 /* it's safe to autoconfigure fixed-voltage supplies
850 and the constraints are used by list_voltage. */
4367cfdc 851 if (count == 1 && !cmin) {
3e590918 852 cmin = 1;
4367cfdc 853 cmax = INT_MAX;
3e590918
MB		 854 constraints->min_uV = cmin;
855 constraints->max_uV = cmax;
4367cfdc
DB		 856 }
857
3e2b9abd
MB		 858 /* voltage constraints are optional */
859 if ((cmin == 0) && (cmax == 0))
e79055d6 860 return 0;
3e2b9abd 861
4367cfdc 862 /* else require explicit machine-level constraints */
3e2b9abd 863 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 864 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 865 return -EINVAL;
4367cfdc
DB		 866 }
867
868 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
869 for (i = 0; i < count; i++) {
870 int value;
871
872 value = ops->list_voltage(rdev, i);
873 if (value <= 0)
874 continue;
875
876 /* maybe adjust [min_uV..max_uV] */
877 if (value >= cmin && value < min_uV)
878 min_uV = value;
879 if (value <= cmax && value > max_uV)
880 max_uV = value;
881 }
882
883 /* final: [min_uV..max_uV] valid iff constraints valid */
884 if (max_uV < min_uV) {
5da84fd9 885 rdev_err(rdev, "unsupportable voltage constraints\n");
e79055d6 886 return -EINVAL;
4367cfdc
DB		 887 }
888
889 /* use regulator's subset of machine constraints */
890 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 891 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
892 constraints->min_uV, min_uV);
4367cfdc
DB		 893 constraints->min_uV = min_uV;
894 }
895 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 896 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
897 constraints->max_uV, max_uV);
4367cfdc
DB		 898 constraints->max_uV = max_uV;
899 }
900 }
901
e79055d6
MB		 902 return 0;
903}
904
905/**
906 * set_machine_constraints - sets regulator constraints
907 * @rdev: regulator source
908 * @constraints: constraints to apply
909 *
910 * Allows platform initialisation code to define and constrain
911 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
912 * Constraints *must* be set by platform code in order for some
913 * regulator operations to proceed i.e. set_voltage, set_current_limit,
914 * set_mode.
915 */
916static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 917 const struct regulation_constraints *constraints)
e79055d6
MB		 918{
919 int ret = 0;
e79055d6
MB		 920 struct regulator_ops *ops = rdev->desc->ops;
921
9a8f5e07
MB		 922 if (constraints)
923 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
924 GFP_KERNEL);
925 else
926 rdev->constraints = kzalloc(sizeof(*constraints),
927 GFP_KERNEL);
f8c12fe3
MB		 928 if (!rdev->constraints)
929 return -ENOMEM;
af5866c9 930
f8c12fe3 931 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6
MB		 932 if (ret != 0)
933 goto out;
934
a5766f11 935 /* do we need to setup our suspend state */
9a8f5e07 936 if (rdev->constraints->initial_state) {
f8c12fe3 937 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 938 if (ret < 0) {
5da84fd9 939 rdev_err(rdev, "failed to set suspend state\n");
e06f5b4f
MB		 940 goto out;
941 }
942 }
a5766f11 943
9a8f5e07 944 if (rdev->constraints->initial_mode) {
a308466c 945 if (!ops->set_mode) {
5da84fd9 946 rdev_err(rdev, "no set_mode operation\n");
a308466c
MB		 947 ret = -EINVAL;
948 goto out;
949 }
950
f8c12fe3 951 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 952 if (ret < 0) {
5da84fd9 953 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
a308466c
MB		 954 goto out;
955 }
956 }
957
cacf90f2
MB		 958 /* If the constraints say the regulator should be on at this point
959 * and we have control then make sure it is enabled.
960 */
f8c12fe3
MB		 961 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
962 ops->enable) {
e5fda26c
MB		 963 ret = ops->enable(rdev);
964 if (ret < 0) {
5da84fd9 965 rdev_err(rdev, "failed to enable\n");
e5fda26c
MB		 966 goto out;
967 }
968 }
969
a5766f11 970 print_constraints(rdev);
1a6958e7 971 return 0;
a5766f11 972out:
1a6958e7
AL		 973 kfree(rdev->constraints);
974 rdev->constraints = NULL;
a5766f11
LG		 975 return ret;
976}
977
978/**
979 * set_supply - set regulator supply regulator
69279fb9
MB		 980 * @rdev: regulator name
981 * @supply_rdev: supply regulator name
a5766f11
LG		 982 *
983 * Called by platform initialisation code to set the supply regulator for this
984 * regulator. This ensures that a regulators supply will also be enabled by the
985 * core if it's child is enabled.
986 */
987static int set_supply(struct regulator_dev *rdev,
3801b86a 988 struct regulator_dev *supply_rdev)
a5766f11
LG		 989{
990 int err;
991
3801b86a
MB		 992 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
993
994 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 995 if (rdev->supply == NULL) {
996 err = -ENOMEM;
3801b86a 997 return err;
a5766f11 998 }
3801b86a
MB		 999
1000 return 0;
a5766f11
LG		 1001}
1002
1003/**
06c63f93 1004 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 1005 * @rdev: regulator source
40f9244f 1006 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 1007 * @supply: symbolic name for supply
a5766f11
LG		 1008 *
1009 * Allows platform initialisation code to map physical regulator
1010 * sources to symbolic names for supplies for use by devices. Devices
1011 * should use these symbolic names to request regulators, avoiding the
1012 * need to provide board-specific regulator names as platform data.
1013 */
1014static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 1015 const char *consumer_dev_name,
1016 const char *supply)
a5766f11
LG		 1017{
1018 struct regulator_map *node;
9ed2099e 1019 int has_dev;
a5766f11
LG		 1020
1021 if (supply == NULL)
1022 return -EINVAL;
1023
9ed2099e
MB		 1024 if (consumer_dev_name != NULL)
1025 has_dev = 1;
1026 else
1027 has_dev = 0;
1028
6001e13c 1029 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1030 if (node->dev_name && consumer_dev_name) {
1031 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1032 continue;
1033 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1034 continue;
23b5cc2a
JN		 1035 }
1036
6001e13c
DB		 1037 if (strcmp(node->supply, supply) != 0)
1038 continue;
1039
737f360d
MB		 1040 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1041 consumer_dev_name,
1042 dev_name(&node->regulator->dev),
1043 node->regulator->desc->name,
1044 supply,
1045 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 1046 return -EBUSY;
1047 }
1048
9ed2099e 1049 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 1050 if (node == NULL)
1051 return -ENOMEM;
1052
1053 node->regulator = rdev;
a5766f11
LG		 1054 node->supply = supply;
1055
9ed2099e
MB		 1056 if (has_dev) {
1057 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1058 if (node->dev_name == NULL) {
1059 kfree(node);
1060 return -ENOMEM;
1061 }
40f9244f
MB		 1062 }
1063
a5766f11
LG		 1064 list_add(&node->list, &regulator_map_list);
1065 return 0;
1066}
1067
0f1d747b
MR		 1068static void unset_regulator_supplies(struct regulator_dev *rdev)
1069{
1070 struct regulator_map *node, *n;
1071
1072 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1073 if (rdev == node->regulator) {
1074 list_del(&node->list);
40f9244f 1075 kfree(node->dev_name);
0f1d747b 1076 kfree(node);
0f1d747b
MR		 1077 }
1078 }
1079}
1080
f5726ae3 1081#define REG_STR_SIZE 64
414c70cb
LG		 1082
1083static struct regulator *create_regulator(struct regulator_dev *rdev,
1084 struct device *dev,
1085 const char *supply_name)
1086{
1087 struct regulator *regulator;
1088 char buf[REG_STR_SIZE];
1089 int err, size;
1090
1091 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1092 if (regulator == NULL)
1093 return NULL;
1094
1095 mutex_lock(&rdev->mutex);
1096 regulator->rdev = rdev;
1097 list_add(&regulator->list, &rdev->consumer_list);
1098
1099 if (dev) {
1100 /* create a 'requested_microamps_name' sysfs entry */
e0eaedef
MB		 1101 size = scnprintf(buf, REG_STR_SIZE,
1102 "microamps_requested_%s-%s",
1103 dev_name(dev), supply_name);
414c70cb
LG		 1104 if (size >= REG_STR_SIZE)
1105 goto overflow_err;
1106
1107 regulator->dev = dev;
4f26a2ab 1108 sysfs_attr_init(&regulator->dev_attr.attr);
414c70cb
LG		 1109 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1110 if (regulator->dev_attr.attr.name == NULL)
1111 goto attr_name_err;
1112
414c70cb
LG		 1113 regulator->dev_attr.attr.mode = 0444;
1114 regulator->dev_attr.show = device_requested_uA_show;
1115 err = device_create_file(dev, &regulator->dev_attr);
1116 if (err < 0) {
5da84fd9 1117 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
414c70cb
LG		 1118 goto attr_name_err;
1119 }
1120
1121 /* also add a link to the device sysfs entry */
1122 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1123 dev->kobj.name, supply_name);
1124 if (size >= REG_STR_SIZE)
1125 goto attr_err;
1126
1127 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1128 if (regulator->supply_name == NULL)
1129 goto attr_err;
1130
1131 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1132 buf);
1133 if (err) {
5da84fd9
JP		 1134 rdev_warn(rdev, "could not add device link %s err %d\n",
1135 dev->kobj.name, err);
414c70cb
LG		 1136 goto link_name_err;
1137 }
5de70519
MB		 1138 } else {
1139 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1140 if (regulator->supply_name == NULL)
1141 goto attr_err;
1142 }
1143
5de70519
MB		 1144 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1145 rdev->debugfs);
24751434 1146 if (!regulator->debugfs) {
5de70519 1147 rdev_warn(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1148 } else {
1149 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1150 &regulator->uA_load);
1151 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1152 &regulator->min_uV);
1153 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1154 &regulator->max_uV);
414c70cb 1155 }
5de70519 1156
6492bc1b
MB		 1157 /*
1158 * Check now if the regulator is an always on regulator - if
1159 * it is then we don't need to do nearly so much work for
1160 * enable/disable calls.
1161 */
1162 if (!_regulator_can_change_status(rdev) &&
1163 _regulator_is_enabled(rdev))
1164 regulator->always_on = true;
1165
414c70cb
LG		 1166 mutex_unlock(&rdev->mutex);
1167 return regulator;
1168link_name_err:
1169 kfree(regulator->supply_name);
1170attr_err:
1171 device_remove_file(regulator->dev, &regulator->dev_attr);
1172attr_name_err:
1173 kfree(regulator->dev_attr.attr.name);
1174overflow_err:
1175 list_del(&regulator->list);
1176 kfree(regulator);
1177 mutex_unlock(&rdev->mutex);
1178 return NULL;
1179}
1180
31aae2be
MB		 1181static int _regulator_get_enable_time(struct regulator_dev *rdev)
1182{
1183 if (!rdev->desc->ops->enable_time)
1184 return 0;
1185 return rdev->desc->ops->enable_time(rdev);
1186}
1187
69511a45 1188static struct regulator_dev *regulator_dev_lookup(struct device *dev,
6d191a5f
MB		 1189 const char *supply,
1190 int *ret)
69511a45
RN		 1191{
1192 struct regulator_dev *r;
1193 struct device_node *node;
576ca436
MB		 1194 struct regulator_map *map;
1195 const char *devname = NULL;
69511a45
RN		 1196
1197 /* first do a dt based lookup */
1198 if (dev && dev->of_node) {
1199 node = of_get_regulator(dev, supply);
6d191a5f 1200 if (node) {
69511a45
RN		 1201 list_for_each_entry(r, &regulator_list, list)
1202 if (r->dev.parent &&
1203 node == r->dev.of_node)
1204 return r;
6d191a5f
MB		 1205 } else {
1206 /*
1207 * If we couldn't even get the node then it's
1208 * not just that the device didn't register
1209 * yet, there's no node and we'll never
1210 * succeed.
1211 */
1212 *ret = -ENODEV;
1213 }
69511a45
RN		 1214 }
1215
1216 /* if not found, try doing it non-dt way */
576ca436
MB		 1217 if (dev)
1218 devname = dev_name(dev);
1219
69511a45
RN		 1220 list_for_each_entry(r, &regulator_list, list)
1221 if (strcmp(rdev_get_name(r), supply) == 0)
1222 return r;
1223
576ca436
MB		 1224 list_for_each_entry(map, &regulator_map_list, list) {
1225 /* If the mapping has a device set up it must match */
1226 if (map->dev_name &&
1227 (!devname || strcmp(map->dev_name, devname)))
1228 continue;
1229
1230 if (strcmp(map->supply, supply) == 0)
1231 return map->regulator;
1232 }
1233
1234
69511a45
RN		 1235 return NULL;
1236}
1237
5ffbd136
MB		 1238/* Internal regulator request function */
1239static struct regulator *_regulator_get(struct device *dev, const char *id,
1240 int exclusive)
414c70cb
LG		 1241{
1242 struct regulator_dev *rdev;
04bf3011 1243 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
40f9244f 1244 const char *devname = NULL;
5ffbd136 1245 int ret;
414c70cb
LG		 1246
1247 if (id == NULL) {
5da84fd9 1248 pr_err("get() with no identifier\n");
414c70cb
LG		 1249 return regulator;
1250 }
1251
40f9244f
MB		 1252 if (dev)
1253 devname = dev_name(dev);
1254
414c70cb
LG		 1255 mutex_lock(&regulator_list_mutex);
1256
6d191a5f 1257 rdev = regulator_dev_lookup(dev, id, &ret);
69511a45
RN		 1258 if (rdev)
1259 goto found;
1260
688fe99a
MB		 1261 if (board_wants_dummy_regulator) {
1262 rdev = dummy_regulator_rdev;
1263 goto found;
1264 }
1265
34abbd68
MB		 1266#ifdef CONFIG_REGULATOR_DUMMY
1267 if (!devname)
1268 devname = "deviceless";
1269
1270 /* If the board didn't flag that it was fully constrained then
1271 * substitute in a dummy regulator so consumers can continue.
1272 */
1273 if (!has_full_constraints) {
5da84fd9
JP		 1274 pr_warn("%s supply %s not found, using dummy regulator\n",
1275 devname, id);
34abbd68
MB		 1276 rdev = dummy_regulator_rdev;
1277 goto found;
1278 }
1279#endif
1280
414c70cb
LG		 1281 mutex_unlock(&regulator_list_mutex);
1282 return regulator;
1283
1284found:
5ffbd136
MB		 1285 if (rdev->exclusive) {
1286 regulator = ERR_PTR(-EPERM);
1287 goto out;
1288 }
1289
1290 if (exclusive && rdev->open_count) {
1291 regulator = ERR_PTR(-EBUSY);
1292 goto out;
1293 }
1294
a5766f11
LG		 1295 if (!try_module_get(rdev->owner))
1296 goto out;
1297
414c70cb
LG		 1298 regulator = create_regulator(rdev, dev, id);
1299 if (regulator == NULL) {
1300 regulator = ERR_PTR(-ENOMEM);
1301 module_put(rdev->owner);
bcda4321 1302 goto out;
414c70cb
LG		 1303 }
1304
5ffbd136
MB		 1305 rdev->open_count++;
1306 if (exclusive) {
1307 rdev->exclusive = 1;
1308
1309 ret = _regulator_is_enabled(rdev);
1310 if (ret > 0)
1311 rdev->use_count = 1;
1312 else
1313 rdev->use_count = 0;
1314 }
1315
a5766f11 1316out:
414c70cb 1317 mutex_unlock(&regulator_list_mutex);
5ffbd136 1318
414c70cb
LG		 1319 return regulator;
1320}
5ffbd136
MB		 1321
1322/**
1323 * regulator_get - lookup and obtain a reference to a regulator.
1324 * @dev: device for regulator "consumer"
1325 * @id: Supply name or regulator ID.
1326 *
1327 * Returns a struct regulator corresponding to the regulator producer,
1328 * or IS_ERR() condition containing errno.
1329 *
1330 * Use of supply names configured via regulator_set_device_supply() is
1331 * strongly encouraged. It is recommended that the supply name used
1332 * should match the name used for the supply and/or the relevant
1333 * device pins in the datasheet.
1334 */
1335struct regulator *regulator_get(struct device *dev, const char *id)
1336{
1337 return _regulator_get(dev, id, 0);
1338}
414c70cb
LG		 1339EXPORT_SYMBOL_GPL(regulator_get);
1340
070b9079
SB		 1341static void devm_regulator_release(struct device *dev, void *res)
1342{
1343 regulator_put(*(struct regulator **)res);
1344}
1345
1346/**
1347 * devm_regulator_get - Resource managed regulator_get()
1348 * @dev: device for regulator "consumer"
1349 * @id: Supply name or regulator ID.
1350 *
1351 * Managed regulator_get(). Regulators returned from this function are
1352 * automatically regulator_put() on driver detach. See regulator_get() for more
1353 * information.
1354 */
1355struct regulator *devm_regulator_get(struct device *dev, const char *id)
1356{
1357 struct regulator **ptr, *regulator;
1358
1359 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1360 if (!ptr)
1361 return ERR_PTR(-ENOMEM);
1362
1363 regulator = regulator_get(dev, id);
1364 if (!IS_ERR(regulator)) {
1365 *ptr = regulator;
1366 devres_add(dev, ptr);
1367 } else {
1368 devres_free(ptr);
1369 }
1370
1371 return regulator;
1372}
1373EXPORT_SYMBOL_GPL(devm_regulator_get);
1374
5ffbd136
MB		 1375/**
1376 * regulator_get_exclusive - obtain exclusive access to a regulator.
1377 * @dev: device for regulator "consumer"
1378 * @id: Supply name or regulator ID.
1379 *
1380 * Returns a struct regulator corresponding to the regulator producer,
1381 * or IS_ERR() condition containing errno. Other consumers will be
1382 * unable to obtain this reference is held and the use count for the
1383 * regulator will be initialised to reflect the current state of the
1384 * regulator.
1385 *
1386 * This is intended for use by consumers which cannot tolerate shared
1387 * use of the regulator such as those which need to force the
1388 * regulator off for correct operation of the hardware they are
1389 * controlling.
1390 *
1391 * Use of supply names configured via regulator_set_device_supply() is
1392 * strongly encouraged. It is recommended that the supply name used
1393 * should match the name used for the supply and/or the relevant
1394 * device pins in the datasheet.
1395 */
1396struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1397{
1398 return _regulator_get(dev, id, 1);
1399}
1400EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1401
414c70cb
LG		 1402/**
1403 * regulator_put - "free" the regulator source
1404 * @regulator: regulator source
1405 *
1406 * Note: drivers must ensure that all regulator_enable calls made on this
1407 * regulator source are balanced by regulator_disable calls prior to calling
1408 * this function.
1409 */
1410void regulator_put(struct regulator *regulator)
1411{
1412 struct regulator_dev *rdev;
1413
1414 if (regulator == NULL || IS_ERR(regulator))
1415 return;
1416
414c70cb
LG		 1417 mutex_lock(&regulator_list_mutex);
1418 rdev = regulator->rdev;
1419
5de70519 1420 debugfs_remove_recursive(regulator->debugfs);
5de70519 1421
414c70cb
LG		 1422 /* remove any sysfs entries */
1423 if (regulator->dev) {
1424 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
414c70cb
LG		 1425 device_remove_file(regulator->dev, &regulator->dev_attr);
1426 kfree(regulator->dev_attr.attr.name);
1427 }
5de70519 1428 kfree(regulator->supply_name);
414c70cb
LG		 1429 list_del(&regulator->list);
1430 kfree(regulator);
1431
5ffbd136
MB		 1432 rdev->open_count--;
1433 rdev->exclusive = 0;
1434
414c70cb
LG		 1435 module_put(rdev->owner);
1436 mutex_unlock(&regulator_list_mutex);
1437}
1438EXPORT_SYMBOL_GPL(regulator_put);
1439
d5ad34f7
MB		 1440static int devm_regulator_match(struct device *dev, void *res, void *data)
1441{
1442 struct regulator **r = res;
1443 if (!r || !*r) {
1444 WARN_ON(!r || !*r);
1445 return 0;
1446 }
1447 return *r == data;
1448}
1449
1450/**
1451 * devm_regulator_put - Resource managed regulator_put()
1452 * @regulator: regulator to free
1453 *
1454 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1455 * this function will not need to be called and the resource management
1456 * code will ensure that the resource is freed.
1457 */
1458void devm_regulator_put(struct regulator *regulator)
1459{
1460 int rc;
1461
1462 rc = devres_destroy(regulator->dev, devm_regulator_release,
1463 devm_regulator_match, regulator);
968c2c17
MB		 1464 if (rc == 0)
1465 regulator_put(regulator);
1466 else
1467 WARN_ON(rc);
d5ad34f7
MB		 1468}
1469EXPORT_SYMBOL_GPL(devm_regulator_put);
1470
414c70cb
LG		 1471/* locks held by regulator_enable() */
1472static int _regulator_enable(struct regulator_dev *rdev)
1473{
31aae2be 1474 int ret, delay;
414c70cb 1475
414c70cb 1476 /* check voltage and requested load before enabling */
9a2372fa
MB		 1477 if (rdev->constraints &&
1478 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1479 drms_uA_update(rdev);
414c70cb 1480
9a2372fa
MB		 1481 if (rdev->use_count == 0) {
1482 /* The regulator may on if it's not switchable or left on */
1483 ret = _regulator_is_enabled(rdev);
1484 if (ret == -EINVAL || ret == 0) {
1485 if (!_regulator_can_change_status(rdev))
1486 return -EPERM;
1487
31aae2be 1488 if (!rdev->desc->ops->enable)
9a2372fa 1489 return -EINVAL;
31aae2be
MB		 1490
1491 /* Query before enabling in case configuration
25985edc 1492 * dependent. */
31aae2be
MB		 1493 ret = _regulator_get_enable_time(rdev);
1494 if (ret >= 0) {
1495 delay = ret;
1496 } else {
5da84fd9 1497 rdev_warn(rdev, "enable_time() failed: %d\n",
1d7372e1 1498 ret);
31aae2be 1499 delay = 0;
9a2372fa 1500 }
31aae2be 1501
02fa3ec0
MB		 1502 trace_regulator_enable(rdev_get_name(rdev));
1503
31aae2be
MB		 1504 /* Allow the regulator to ramp; it would be useful
1505 * to extend this for bulk operations so that the
1506 * regulators can ramp together. */
1507 ret = rdev->desc->ops->enable(rdev);
1508 if (ret < 0)
1509 return ret;
1510
02fa3ec0
MB		 1511 trace_regulator_enable_delay(rdev_get_name(rdev));
1512
e36c1df8 1513 if (delay >= 1000) {
31aae2be 1514 mdelay(delay / 1000);
e36c1df8
AL		 1515 udelay(delay % 1000);
1516 } else if (delay) {
31aae2be 1517 udelay(delay);
e36c1df8 1518 }
31aae2be 1519
02fa3ec0
MB		 1520 trace_regulator_enable_complete(rdev_get_name(rdev));
1521
a7433cff 1522 } else if (ret < 0) {
5da84fd9 1523 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 1524 return ret;
1525 }
a7433cff 1526 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 1527 }
1528
9a2372fa
MB		 1529 rdev->use_count++;
1530
1531 return 0;
414c70cb
LG		 1532}
1533
1534/**
1535 * regulator_enable - enable regulator output
1536 * @regulator: regulator source
1537 *
cf7bbcdf
MB		 1538 * Request that the regulator be enabled with the regulator output at
1539 * the predefined voltage or current value. Calls to regulator_enable()
1540 * must be balanced with calls to regulator_disable().
1541 *
414c70cb 1542 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 1543 * hardwired in the regulator.
414c70cb
LG		 1544 */
1545int regulator_enable(struct regulator *regulator)
1546{
412aec61
DB		 1547 struct regulator_dev *rdev = regulator->rdev;
1548 int ret = 0;
414c70cb 1549
6492bc1b
MB		 1550 if (regulator->always_on)
1551 return 0;
1552
3801b86a
MB		 1553 if (rdev->supply) {
1554 ret = regulator_enable(rdev->supply);
1555 if (ret != 0)
1556 return ret;
1557 }
1558
412aec61 1559 mutex_lock(&rdev->mutex);
cd94b505 1560 ret = _regulator_enable(rdev);
412aec61 1561 mutex_unlock(&rdev->mutex);
3801b86a 1562
d1685e4e 1563 if (ret != 0 && rdev->supply)
3801b86a
MB		 1564 regulator_disable(rdev->supply);
1565
414c70cb
LG		 1566 return ret;
1567}
1568EXPORT_SYMBOL_GPL(regulator_enable);
1569
1570/* locks held by regulator_disable() */
3801b86a 1571static int _regulator_disable(struct regulator_dev *rdev)
414c70cb
LG		 1572{
1573 int ret = 0;
1574
cd94b505 1575 if (WARN(rdev->use_count <= 0,
43e7ee33 1576 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 1577 return -EIO;
1578
414c70cb 1579 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 1580 if (rdev->use_count == 1 &&
1581 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 1582
1583 /* we are last user */
9a2372fa
MB		 1584 if (_regulator_can_change_status(rdev) &&
1585 rdev->desc->ops->disable) {
02fa3ec0
MB		 1586 trace_regulator_disable(rdev_get_name(rdev));
1587
414c70cb
LG		 1588 ret = rdev->desc->ops->disable(rdev);
1589 if (ret < 0) {
5da84fd9 1590 rdev_err(rdev, "failed to disable\n");
414c70cb
LG		 1591 return ret;
1592 }
84b68263 1593
02fa3ec0
MB		 1594 trace_regulator_disable_complete(rdev_get_name(rdev));
1595
84b68263
MB		 1596 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1597 NULL);
414c70cb
LG		 1598 }
1599
414c70cb
LG		 1600 rdev->use_count = 0;
1601 } else if (rdev->use_count > 1) {
1602
1603 if (rdev->constraints &&
1604 (rdev->constraints->valid_ops_mask &
1605 REGULATOR_CHANGE_DRMS))
1606 drms_uA_update(rdev);
1607
1608 rdev->use_count--;
1609 }
3801b86a 1610
414c70cb
LG		 1611 return ret;
1612}
1613
1614/**
1615 * regulator_disable - disable regulator output
1616 * @regulator: regulator source
1617 *
cf7bbcdf
MB		 1618 * Disable the regulator output voltage or current. Calls to
1619 * regulator_enable() must be balanced with calls to
1620 * regulator_disable().
69279fb9 1621 *
414c70cb 1622 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 1623 * devices have it enabled, the regulator device supports disabling and
1624 * machine constraints permit this operation.
414c70cb
LG		 1625 */
1626int regulator_disable(struct regulator *regulator)
1627{
412aec61
DB		 1628 struct regulator_dev *rdev = regulator->rdev;
1629 int ret = 0;
414c70cb 1630
6492bc1b
MB		 1631 if (regulator->always_on)
1632 return 0;
1633
412aec61 1634 mutex_lock(&rdev->mutex);
3801b86a 1635 ret = _regulator_disable(rdev);
412aec61 1636 mutex_unlock(&rdev->mutex);
8cbf811d 1637
3801b86a
MB		 1638 if (ret == 0 && rdev->supply)
1639 regulator_disable(rdev->supply);
8cbf811d 1640
414c70cb
LG		 1641 return ret;
1642}
1643EXPORT_SYMBOL_GPL(regulator_disable);
1644
1645/* locks held by regulator_force_disable() */
3801b86a 1646static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 1647{
1648 int ret = 0;
1649
1650 /* force disable */
1651 if (rdev->desc->ops->disable) {
1652 /* ah well, who wants to live forever... */
1653 ret = rdev->desc->ops->disable(rdev);
1654 if (ret < 0) {
5da84fd9 1655 rdev_err(rdev, "failed to force disable\n");
414c70cb
LG		 1656 return ret;
1657 }
1658 /* notify other consumers that power has been forced off */
84b68263
MB		 1659 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1660 REGULATOR_EVENT_DISABLE, NULL);
414c70cb
LG		 1661 }
1662
414c70cb
LG		 1663 return ret;
1664}
1665
1666/**
1667 * regulator_force_disable - force disable regulator output
1668 * @regulator: regulator source
1669 *
1670 * Forcibly disable the regulator output voltage or current.
1671 * NOTE: this *will* disable the regulator output even if other consumer
1672 * devices have it enabled. This should be used for situations when device
1673 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1674 */
1675int regulator_force_disable(struct regulator *regulator)
1676{
82d15839 1677 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 1678 int ret;
1679
82d15839 1680 mutex_lock(&rdev->mutex);
414c70cb 1681 regulator->uA_load = 0;
3801b86a 1682 ret = _regulator_force_disable(regulator->rdev);
82d15839 1683 mutex_unlock(&rdev->mutex);
8cbf811d 1684
3801b86a
MB		 1685 if (rdev->supply)
1686 while (rdev->open_count--)
1687 regulator_disable(rdev->supply);
8cbf811d 1688
414c70cb
LG		 1689 return ret;
1690}
1691EXPORT_SYMBOL_GPL(regulator_force_disable);
1692
da07ecd9
MB		 1693static void regulator_disable_work(struct work_struct *work)
1694{
1695 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1696 disable_work.work);
1697 int count, i, ret;
1698
1699 mutex_lock(&rdev->mutex);
1700
1701 BUG_ON(!rdev->deferred_disables);
1702
1703 count = rdev->deferred_disables;
1704 rdev->deferred_disables = 0;
1705
1706 for (i = 0; i < count; i++) {
1707 ret = _regulator_disable(rdev);
1708 if (ret != 0)
1709 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1710 }
1711
1712 mutex_unlock(&rdev->mutex);
1713
1714 if (rdev->supply) {
1715 for (i = 0; i < count; i++) {
1716 ret = regulator_disable(rdev->supply);
1717 if (ret != 0) {
1718 rdev_err(rdev,
1719 "Supply disable failed: %d\n", ret);
1720 }
1721 }
1722 }
1723}
1724
1725/**
1726 * regulator_disable_deferred - disable regulator output with delay
1727 * @regulator: regulator source
1728 * @ms: miliseconds until the regulator is disabled
1729 *
1730 * Execute regulator_disable() on the regulator after a delay. This
1731 * is intended for use with devices that require some time to quiesce.
1732 *
1733 * NOTE: this will only disable the regulator output if no other consumer
1734 * devices have it enabled, the regulator device supports disabling and
1735 * machine constraints permit this operation.
1736 */
1737int regulator_disable_deferred(struct regulator *regulator, int ms)
1738{
1739 struct regulator_dev *rdev = regulator->rdev;
aa59802d 1740 int ret;
da07ecd9 1741
6492bc1b
MB		 1742 if (regulator->always_on)
1743 return 0;
1744
da07ecd9
MB		 1745 mutex_lock(&rdev->mutex);
1746 rdev->deferred_disables++;
1747 mutex_unlock(&rdev->mutex);
1748
aa59802d
MB		 1749 ret = schedule_delayed_work(&rdev->disable_work,
1750 msecs_to_jiffies(ms));
1751 if (ret < 0)
1752 return ret;
1753 else
1754 return 0;
da07ecd9
MB		 1755}
1756EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1757
cd6dffb4
MB		 1758/**
1759 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1760 *
1761 * @rdev: regulator to operate on
1762 *
1763 * Regulators that use regmap for their register I/O can set the
1764 * enable_reg and enable_mask fields in their descriptor and then use
1765 * this as their is_enabled operation, saving some code.
1766 */
1767int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1768{
1769 unsigned int val;
1770 int ret;
1771
1772 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1773 if (ret != 0)
1774 return ret;
1775
1776 return (val & rdev->desc->enable_mask) != 0;
1777}
1778EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1779
1780/**
1781 * regulator_enable_regmap - standard enable() for regmap users
1782 *
1783 * @rdev: regulator to operate on
1784 *
1785 * Regulators that use regmap for their register I/O can set the
1786 * enable_reg and enable_mask fields in their descriptor and then use
1787 * this as their enable() operation, saving some code.
1788 */
1789int regulator_enable_regmap(struct regulator_dev *rdev)
1790{
1791 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1792 rdev->desc->enable_mask,
1793 rdev->desc->enable_mask);
1794}
1795EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1796
1797/**
1798 * regulator_disable_regmap - standard disable() for regmap users
1799 *
1800 * @rdev: regulator to operate on
1801 *
1802 * Regulators that use regmap for their register I/O can set the
1803 * enable_reg and enable_mask fields in their descriptor and then use
1804 * this as their disable() operation, saving some code.
1805 */
1806int regulator_disable_regmap(struct regulator_dev *rdev)
1807{
1808 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1809 rdev->desc->enable_mask, 0);
1810}
1811EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1812
414c70cb
LG		 1813static int _regulator_is_enabled(struct regulator_dev *rdev)
1814{
9a7f6a4c 1815 /* If we don't know then assume that the regulator is always on */
9332546f 1816 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 1817 return 1;
414c70cb 1818
9332546f 1819 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 1820}
1821
1822/**
1823 * regulator_is_enabled - is the regulator output enabled
1824 * @regulator: regulator source
1825 *
412aec61
DB		 1826 * Returns positive if the regulator driver backing the source/client
1827 * has requested that the device be enabled, zero if it hasn't, else a
1828 * negative errno code.
1829 *
1830 * Note that the device backing this regulator handle can have multiple
1831 * users, so it might be enabled even if regulator_enable() was never
1832 * called for this particular source.
414c70cb
LG		 1833 */
1834int regulator_is_enabled(struct regulator *regulator)
1835{
9332546f
MB		 1836 int ret;
1837
6492bc1b
MB		 1838 if (regulator->always_on)
1839 return 1;
1840
9332546f
MB		 1841 mutex_lock(&regulator->rdev->mutex);
1842 ret = _regulator_is_enabled(regulator->rdev);
1843 mutex_unlock(&regulator->rdev->mutex);
1844
1845 return ret;
414c70cb
LG		 1846}
1847EXPORT_SYMBOL_GPL(regulator_is_enabled);
1848
4367cfdc
DB		 1849/**
1850 * regulator_count_voltages - count regulator_list_voltage() selectors
1851 * @regulator: regulator source
1852 *
1853 * Returns number of selectors, or negative errno. Selectors are
1854 * numbered starting at zero, and typically correspond to bitfields
1855 * in hardware registers.
1856 */
1857int regulator_count_voltages(struct regulator *regulator)
1858{
1859 struct regulator_dev *rdev = regulator->rdev;
1860
1861 return rdev->desc->n_voltages ? : -EINVAL;
1862}
1863EXPORT_SYMBOL_GPL(regulator_count_voltages);
1864
bca7bbff
MB		 1865/**
1866 * regulator_list_voltage_linear - List voltages with simple calculation
1867 *
1868 * @rdev: Regulator device
1869 * @selector: Selector to convert into a voltage
1870 *
1871 * Regulators with a simple linear mapping between voltages and
1872 * selectors can set min_uV and uV_step in the regulator descriptor
1873 * and then use this function as their list_voltage() operation,
1874 */
1875int regulator_list_voltage_linear(struct regulator_dev *rdev,
1876 unsigned int selector)
1877{
1878 if (selector >= rdev->desc->n_voltages)
1879 return -EINVAL;
1880
1881 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
1882}
1883EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
1884
4367cfdc
DB		 1885/**
1886 * regulator_list_voltage - enumerate supported voltages
1887 * @regulator: regulator source
1888 * @selector: identify voltage to list
1889 * Context: can sleep
1890 *
1891 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 1892 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 1893 * negative errno.
1894 */
1895int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1896{
1897 struct regulator_dev *rdev = regulator->rdev;
1898 struct regulator_ops *ops = rdev->desc->ops;
1899 int ret;
1900
1901 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1902 return -EINVAL;
1903
1904 mutex_lock(&rdev->mutex);
1905 ret = ops->list_voltage(rdev, selector);
1906 mutex_unlock(&rdev->mutex);
1907
1908 if (ret > 0) {
1909 if (ret < rdev->constraints->min_uV)
1910 ret = 0;
1911 else if (ret > rdev->constraints->max_uV)
1912 ret = 0;
1913 }
1914
1915 return ret;
1916}
1917EXPORT_SYMBOL_GPL(regulator_list_voltage);
1918
a7a1ad90
MB		 1919/**
1920 * regulator_is_supported_voltage - check if a voltage range can be supported
1921 *
1922 * @regulator: Regulator to check.
1923 * @min_uV: Minimum required voltage in uV.
1924 * @max_uV: Maximum required voltage in uV.
1925 *
1926 * Returns a boolean or a negative error code.
1927 */
1928int regulator_is_supported_voltage(struct regulator *regulator,
1929 int min_uV, int max_uV)
1930{
1931 int i, voltages, ret;
1932
1933 ret = regulator_count_voltages(regulator);
1934 if (ret < 0)
1935 return ret;
1936 voltages = ret;
1937
1938 for (i = 0; i < voltages; i++) {
1939 ret = regulator_list_voltage(regulator, i);
1940
1941 if (ret >= min_uV && ret <= max_uV)
1942 return 1;
1943 }
1944
1945 return 0;
1946}
a398eaa2 1947EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 1948
4ab5b3d9
MB		 1949/**
1950 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
1951 *
1952 * @rdev: regulator to operate on
1953 *
1954 * Regulators that use regmap for their register I/O can set the
1955 * vsel_reg and vsel_mask fields in their descriptor and then use this
1956 * as their get_voltage_vsel operation, saving some code.
1957 */
1958int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
1959{
1960 unsigned int val;
1961 int ret;
1962
1963 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
1964 if (ret != 0)
1965 return ret;
1966
1967 val &= rdev->desc->vsel_mask;
1968 val >>= ffs(rdev->desc->vsel_mask) - 1;
1969
1970 return val;
1971}
1972EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
1973
1974/**
1975 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
1976 *
1977 * @rdev: regulator to operate on
1978 * @sel: Selector to set
1979 *
1980 * Regulators that use regmap for their register I/O can set the
1981 * vsel_reg and vsel_mask fields in their descriptor and then use this
1982 * as their set_voltage_vsel operation, saving some code.
1983 */
1984int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
1985{
1986 sel <<= ffs(rdev->desc->vsel_mask) - 1;
1987
1988 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
1989 rdev->desc->vsel_mask, sel);
1990}
1991EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
1992
e843fc46
MB		 1993/**
1994 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
1995 *
1996 * @rdev: Regulator to operate on
1997 * @min_uV: Lower bound for voltage
1998 * @max_uV: Upper bound for voltage
1999 *
2000 * Drivers implementing set_voltage_sel() and list_voltage() can use
2001 * this as their map_voltage() operation. It will find a suitable
2002 * voltage by calling list_voltage() until it gets something in bounds
2003 * for the requested voltages.
2004 */
2005int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2006 int min_uV, int max_uV)
2007{
2008 int best_val = INT_MAX;
2009 int selector = 0;
2010 int i, ret;
2011
2012 /* Find the smallest voltage that falls within the specified
2013 * range.
2014 */
2015 for (i = 0; i < rdev->desc->n_voltages; i++) {
2016 ret = rdev->desc->ops->list_voltage(rdev, i);
2017 if (ret < 0)
2018 continue;
2019
2020 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2021 best_val = ret;
2022 selector = i;
2023 }
2024 }
2025
2026 if (best_val != INT_MAX)
2027 return selector;
2028 else
2029 return -EINVAL;
2030}
2031EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2032
bca7bbff
MB		 2033/**
2034 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2035 *
2036 * @rdev: Regulator to operate on
2037 * @min_uV: Lower bound for voltage
2038 * @max_uV: Upper bound for voltage
2039 *
2040 * Drivers providing min_uV and uV_step in their regulator_desc can
2041 * use this as their map_voltage() operation.
2042 */
2043int regulator_map_voltage_linear(struct regulator_dev *rdev,
2044 int min_uV, int max_uV)
2045{
2046 int ret, voltage;
2047
2048 if (!rdev->desc->uV_step) {
2049 BUG_ON(!rdev->desc->uV_step);
2050 return -EINVAL;
2051 }
2052
ccfcb1c3 2053 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
bca7bbff
MB		 2054 if (ret < 0)
2055 return ret;
2056
2057 /* Map back into a voltage to verify we're still in bounds */
2058 voltage = rdev->desc->ops->list_voltage(rdev, ret);
2059 if (voltage < min_uV || voltage > max_uV)
2060 return -EINVAL;
2061
2062 return ret;
2063}
2064EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2065
75790251
MB		 2066static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2067 int min_uV, int max_uV)
2068{
2069 int ret;
77af1b26 2070 int delay = 0;
e843fc46 2071 int best_val;
75790251 2072 unsigned int selector;
eba41a5e 2073 int old_selector = -1;
75790251
MB		 2074
2075 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2076
bf5892a8
MB		 2077 min_uV += rdev->constraints->uV_offset;
2078 max_uV += rdev->constraints->uV_offset;
2079
eba41a5e
AL		 2080 /*
2081 * If we can't obtain the old selector there is not enough
2082 * info to call set_voltage_time_sel().
2083 */
2084 if (rdev->desc->ops->set_voltage_time_sel &&
2085 rdev->desc->ops->get_voltage_sel) {
2086 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2087 if (old_selector < 0)
2088 return old_selector;
2089 }
2090
75790251
MB		 2091 if (rdev->desc->ops->set_voltage) {
2092 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2093 &selector);
e8eef82b 2094 } else if (rdev->desc->ops->set_voltage_sel) {
e843fc46
MB		 2095 if (rdev->desc->ops->map_voltage)
2096 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2097 max_uV);
2098 else
2099 ret = regulator_map_voltage_iterate(rdev, min_uV,
2100 max_uV);
e8eef82b 2101
e843fc46
MB		 2102 if (ret >= 0) {
2103 selector = ret;
2104 ret = rdev->desc->ops->set_voltage_sel(rdev, ret);
e8eef82b 2105 }
75790251
MB		 2106 } else {
2107 ret = -EINVAL;
2108 }
e8eef82b 2109
e843fc46
MB		 2110 if (rdev->desc->ops->list_voltage)
2111 best_val = rdev->desc->ops->list_voltage(rdev, selector);
2112 else
2113 best_val = -1;
77af1b26 2114
eba41a5e
AL		 2115 /* Call set_voltage_time_sel if successfully obtained old_selector */
2116 if (ret == 0 && old_selector >= 0 &&
2117 rdev->desc->ops->set_voltage_time_sel) {
77af1b26 2118
eba41a5e
AL		 2119 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2120 old_selector, selector);
2121 if (delay < 0) {
2122 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2123 delay);
2124 delay = 0;
e8eef82b 2125 }
75790251
MB		 2126 }
2127
77af1b26
LW		 2128 /* Insert any necessary delays */
2129 if (delay >= 1000) {
2130 mdelay(delay / 1000);
2131 udelay(delay % 1000);
2132 } else if (delay) {
2133 udelay(delay);
2134 }
2135
ded06a52
MB		 2136 if (ret == 0)
2137 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2138 NULL);
2139
eba41a5e 2140 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
75790251
MB		 2141
2142 return ret;
2143}
2144
414c70cb
LG		 2145/**
2146 * regulator_set_voltage - set regulator output voltage
2147 * @regulator: regulator source
2148 * @min_uV: Minimum required voltage in uV
2149 * @max_uV: Maximum acceptable voltage in uV
2150 *
2151 * Sets a voltage regulator to the desired output voltage. This can be set
2152 * during any regulator state. IOW, regulator can be disabled or enabled.
2153 *
2154 * If the regulator is enabled then the voltage will change to the new value
2155 * immediately otherwise if the regulator is disabled the regulator will
2156 * output at the new voltage when enabled.
2157 *
2158 * NOTE: If the regulator is shared between several devices then the lowest
2159 * request voltage that meets the system constraints will be used.
69279fb9 2160 * Regulator system constraints must be set for this regulator before
414c70cb
LG		 2161 * calling this function otherwise this call will fail.
2162 */
2163int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2164{
2165 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 2166 int ret = 0;
414c70cb
LG		 2167
2168 mutex_lock(&rdev->mutex);
2169
95a3c23a
MB		 2170 /* If we're setting the same range as last time the change
2171 * should be a noop (some cpufreq implementations use the same
2172 * voltage for multiple frequencies, for example).
2173 */
2174 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2175 goto out;
2176
414c70cb 2177 /* sanity check */
e8eef82b
MB		 2178 if (!rdev->desc->ops->set_voltage &&
2179 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 2180 ret = -EINVAL;
2181 goto out;
2182 }
2183
2184 /* constraints check */
2185 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2186 if (ret < 0)
2187 goto out;
2188 regulator->min_uV = min_uV;
2189 regulator->max_uV = max_uV;
3a93f2a9 2190
05fda3b1
TP		 2191 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2192 if (ret < 0)
2193 goto out;
2194
75790251 2195 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
02fa3ec0 2196
414c70cb
LG		 2197out:
2198 mutex_unlock(&rdev->mutex);
2199 return ret;
2200}
2201EXPORT_SYMBOL_GPL(regulator_set_voltage);
2202
88cd222b
LW		 2203/**
2204 * regulator_set_voltage_time - get raise/fall time
2205 * @regulator: regulator source
2206 * @old_uV: starting voltage in microvolts
2207 * @new_uV: target voltage in microvolts
2208 *
2209 * Provided with the starting and ending voltage, this function attempts to
2210 * calculate the time in microseconds required to rise or fall to this new
2211 * voltage.
2212 */
2213int regulator_set_voltage_time(struct regulator *regulator,
2214 int old_uV, int new_uV)
2215{
2216 struct regulator_dev *rdev = regulator->rdev;
2217 struct regulator_ops *ops = rdev->desc->ops;
2218 int old_sel = -1;
2219 int new_sel = -1;
2220 int voltage;
2221 int i;
2222
2223 /* Currently requires operations to do this */
2224 if (!ops->list_voltage || !ops->set_voltage_time_sel
2225 || !rdev->desc->n_voltages)
2226 return -EINVAL;
2227
2228 for (i = 0; i < rdev->desc->n_voltages; i++) {
2229 /* We only look for exact voltage matches here */
2230 voltage = regulator_list_voltage(regulator, i);
2231 if (voltage < 0)
2232 return -EINVAL;
2233 if (voltage == 0)
2234 continue;
2235 if (voltage == old_uV)
2236 old_sel = i;
2237 if (voltage == new_uV)
2238 new_sel = i;
2239 }
2240
2241 if (old_sel < 0 || new_sel < 0)
2242 return -EINVAL;
2243
2244 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2245}
2246EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2247
606a2562
MB		 2248/**
2249 * regulator_sync_voltage - re-apply last regulator output voltage
2250 * @regulator: regulator source
2251 *
2252 * Re-apply the last configured voltage. This is intended to be used
2253 * where some external control source the consumer is cooperating with
2254 * has caused the configured voltage to change.
2255 */
2256int regulator_sync_voltage(struct regulator *regulator)
2257{
2258 struct regulator_dev *rdev = regulator->rdev;
2259 int ret, min_uV, max_uV;
2260
2261 mutex_lock(&rdev->mutex);
2262
2263 if (!rdev->desc->ops->set_voltage &&
2264 !rdev->desc->ops->set_voltage_sel) {
2265 ret = -EINVAL;
2266 goto out;
2267 }
2268
2269 /* This is only going to work if we've had a voltage configured. */
2270 if (!regulator->min_uV && !regulator->max_uV) {
2271 ret = -EINVAL;
2272 goto out;
2273 }
2274
2275 min_uV = regulator->min_uV;
2276 max_uV = regulator->max_uV;
2277
2278 /* This should be a paranoia check... */
2279 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2280 if (ret < 0)
2281 goto out;
2282
2283 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2284 if (ret < 0)
2285 goto out;
2286
2287 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2288
2289out:
2290 mutex_unlock(&rdev->mutex);
2291 return ret;
2292}
2293EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2294
414c70cb
LG		 2295static int _regulator_get_voltage(struct regulator_dev *rdev)
2296{
bf5892a8 2297 int sel, ret;
476c2d83
MB		 2298
2299 if (rdev->desc->ops->get_voltage_sel) {
2300 sel = rdev->desc->ops->get_voltage_sel(rdev);
2301 if (sel < 0)
2302 return sel;
bf5892a8 2303 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 2304 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 2305 ret = rdev->desc->ops->get_voltage(rdev);
cb220d16 2306 } else {
414c70cb 2307 return -EINVAL;
cb220d16 2308 }
bf5892a8 2309
cb220d16
AL		 2310 if (ret < 0)
2311 return ret;
bf5892a8 2312 return ret - rdev->constraints->uV_offset;
414c70cb
LG		 2313}
2314
2315/**
2316 * regulator_get_voltage - get regulator output voltage
2317 * @regulator: regulator source
2318 *
2319 * This returns the current regulator voltage in uV.
2320 *
2321 * NOTE: If the regulator is disabled it will return the voltage value. This
2322 * function should not be used to determine regulator state.
2323 */
2324int regulator_get_voltage(struct regulator *regulator)
2325{
2326 int ret;
2327
2328 mutex_lock(&regulator->rdev->mutex);
2329
2330 ret = _regulator_get_voltage(regulator->rdev);
2331
2332 mutex_unlock(&regulator->rdev->mutex);
2333
2334 return ret;
2335}
2336EXPORT_SYMBOL_GPL(regulator_get_voltage);
2337
2338/**
2339 * regulator_set_current_limit - set regulator output current limit
2340 * @regulator: regulator source
2341 * @min_uA: Minimuum supported current in uA
2342 * @max_uA: Maximum supported current in uA
2343 *
2344 * Sets current sink to the desired output current. This can be set during
2345 * any regulator state. IOW, regulator can be disabled or enabled.
2346 *
2347 * If the regulator is enabled then the current will change to the new value
2348 * immediately otherwise if the regulator is disabled the regulator will
2349 * output at the new current when enabled.
2350 *
2351 * NOTE: Regulator system constraints must be set for this regulator before
2352 * calling this function otherwise this call will fail.
2353 */
2354int regulator_set_current_limit(struct regulator *regulator,
2355 int min_uA, int max_uA)
2356{
2357 struct regulator_dev *rdev = regulator->rdev;
2358 int ret;
2359
2360 mutex_lock(&rdev->mutex);
2361
2362 /* sanity check */
2363 if (!rdev->desc->ops->set_current_limit) {
2364 ret = -EINVAL;
2365 goto out;
2366 }
2367
2368 /* constraints check */
2369 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2370 if (ret < 0)
2371 goto out;
2372
2373 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2374out:
2375 mutex_unlock(&rdev->mutex);
2376 return ret;
2377}
2378EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2379
2380static int _regulator_get_current_limit(struct regulator_dev *rdev)
2381{
2382 int ret;
2383
2384 mutex_lock(&rdev->mutex);
2385
2386 /* sanity check */
2387 if (!rdev->desc->ops->get_current_limit) {
2388 ret = -EINVAL;
2389 goto out;
2390 }
2391
2392 ret = rdev->desc->ops->get_current_limit(rdev);
2393out:
2394 mutex_unlock(&rdev->mutex);
2395 return ret;
2396}
2397
2398/**
2399 * regulator_get_current_limit - get regulator output current
2400 * @regulator: regulator source
2401 *
2402 * This returns the current supplied by the specified current sink in uA.
2403 *
2404 * NOTE: If the regulator is disabled it will return the current value. This
2405 * function should not be used to determine regulator state.
2406 */
2407int regulator_get_current_limit(struct regulator *regulator)
2408{
2409 return _regulator_get_current_limit(regulator->rdev);
2410}
2411EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2412
2413/**
2414 * regulator_set_mode - set regulator operating mode
2415 * @regulator: regulator source
2416 * @mode: operating mode - one of the REGULATOR_MODE constants
2417 *
2418 * Set regulator operating mode to increase regulator efficiency or improve
2419 * regulation performance.
2420 *
2421 * NOTE: Regulator system constraints must be set for this regulator before
2422 * calling this function otherwise this call will fail.
2423 */
2424int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2425{
2426 struct regulator_dev *rdev = regulator->rdev;
2427 int ret;
500b4ac9 2428 int regulator_curr_mode;
414c70cb
LG		 2429
2430 mutex_lock(&rdev->mutex);
2431
2432 /* sanity check */
2433 if (!rdev->desc->ops->set_mode) {
2434 ret = -EINVAL;
2435 goto out;
2436 }
2437
500b4ac9
SI		 2438 /* return if the same mode is requested */
2439 if (rdev->desc->ops->get_mode) {
2440 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2441 if (regulator_curr_mode == mode) {
2442 ret = 0;
2443 goto out;
2444 }
2445 }
2446
414c70cb 2447 /* constraints check */
22c51b47 2448 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 2449 if (ret < 0)
2450 goto out;
2451
2452 ret = rdev->desc->ops->set_mode(rdev, mode);
2453out:
2454 mutex_unlock(&rdev->mutex);
2455 return ret;
2456}
2457EXPORT_SYMBOL_GPL(regulator_set_mode);
2458
2459static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2460{
2461 int ret;
2462
2463 mutex_lock(&rdev->mutex);
2464
2465 /* sanity check */
2466 if (!rdev->desc->ops->get_mode) {
2467 ret = -EINVAL;
2468 goto out;
2469 }
2470
2471 ret = rdev->desc->ops->get_mode(rdev);
2472out:
2473 mutex_unlock(&rdev->mutex);
2474 return ret;
2475}
2476
2477/**
2478 * regulator_get_mode - get regulator operating mode
2479 * @regulator: regulator source
2480 *
2481 * Get the current regulator operating mode.
2482 */
2483unsigned int regulator_get_mode(struct regulator *regulator)
2484{
2485 return _regulator_get_mode(regulator->rdev);
2486}
2487EXPORT_SYMBOL_GPL(regulator_get_mode);
2488
2489/**
2490 * regulator_set_optimum_mode - set regulator optimum operating mode
2491 * @regulator: regulator source
2492 * @uA_load: load current
2493 *
2494 * Notifies the regulator core of a new device load. This is then used by
2495 * DRMS (if enabled by constraints) to set the most efficient regulator
2496 * operating mode for the new regulator loading.
2497 *
2498 * Consumer devices notify their supply regulator of the maximum power
2499 * they will require (can be taken from device datasheet in the power
2500 * consumption tables) when they change operational status and hence power
2501 * state. Examples of operational state changes that can affect power
2502 * consumption are :-
2503 *
2504 * o Device is opened / closed.
2505 * o Device I/O is about to begin or has just finished.
2506 * o Device is idling in between work.
2507 *
2508 * This information is also exported via sysfs to userspace.
2509 *
2510 * DRMS will sum the total requested load on the regulator and change
2511 * to the most efficient operating mode if platform constraints allow.
2512 *
2513 * Returns the new regulator mode or error.
2514 */
2515int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2516{
2517 struct regulator_dev *rdev = regulator->rdev;
2518 struct regulator *consumer;
2519 int ret, output_uV, input_uV, total_uA_load = 0;
2520 unsigned int mode;
2521
2522 mutex_lock(&rdev->mutex);
2523
a4b41483
MB		 2524 /*
2525 * first check to see if we can set modes at all, otherwise just
2526 * tell the consumer everything is OK.
2527 */
414c70cb
LG		 2528 regulator->uA_load = uA_load;
2529 ret = regulator_check_drms(rdev);
a4b41483
MB		 2530 if (ret < 0) {
2531 ret = 0;
414c70cb 2532 goto out;
a4b41483 2533 }
414c70cb 2534
414c70cb
LG		 2535 if (!rdev->desc->ops->get_optimum_mode)
2536 goto out;
2537
a4b41483
MB		 2538 /*
2539 * we can actually do this so any errors are indicators of
2540 * potential real failure.
2541 */
2542 ret = -EINVAL;
2543
854ccbae
AL		 2544 if (!rdev->desc->ops->set_mode)
2545 goto out;
2546
414c70cb 2547 /* get output voltage */
1bf5a1f8 2548 output_uV = _regulator_get_voltage(rdev);
414c70cb 2549 if (output_uV <= 0) {
5da84fd9 2550 rdev_err(rdev, "invalid output voltage found\n");
414c70cb
LG		 2551 goto out;
2552 }
2553
2554 /* get input voltage */
1bf5a1f8
MB		 2555 input_uV = 0;
2556 if (rdev->supply)
3801b86a 2557 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 2558 if (input_uV <= 0)
414c70cb
LG		 2559 input_uV = rdev->constraints->input_uV;
2560 if (input_uV <= 0) {
5da84fd9 2561 rdev_err(rdev, "invalid input voltage found\n");
414c70cb
LG		 2562 goto out;
2563 }
2564
2565 /* calc total requested load for this regulator */
2566 list_for_each_entry(consumer, &rdev->consumer_list, list)
fa2984d4 2567 total_uA_load += consumer->uA_load;
414c70cb
LG		 2568
2569 mode = rdev->desc->ops->get_optimum_mode(rdev,
2570 input_uV, output_uV,
2571 total_uA_load);
2c608234 2572 ret = regulator_mode_constrain(rdev, &mode);
e573520b 2573 if (ret < 0) {
5da84fd9
JP		 2574 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2575 total_uA_load, input_uV, output_uV);
414c70cb
LG		 2576 goto out;
2577 }
2578
2579 ret = rdev->desc->ops->set_mode(rdev, mode);
e573520b 2580 if (ret < 0) {
5da84fd9 2581 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
414c70cb
LG		 2582 goto out;
2583 }
2584 ret = mode;
2585out:
2586 mutex_unlock(&rdev->mutex);
2587 return ret;
2588}
2589EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2590
2591/**
2592 * regulator_register_notifier - register regulator event notifier
2593 * @regulator: regulator source
69279fb9 2594 * @nb: notifier block
414c70cb
LG		 2595 *
2596 * Register notifier block to receive regulator events.
2597 */
2598int regulator_register_notifier(struct regulator *regulator,
2599 struct notifier_block *nb)
2600{
2601 return blocking_notifier_chain_register(&regulator->rdev->notifier,
2602 nb);
2603}
2604EXPORT_SYMBOL_GPL(regulator_register_notifier);
2605
2606/**
2607 * regulator_unregister_notifier - unregister regulator event notifier
2608 * @regulator: regulator source
69279fb9 2609 * @nb: notifier block
414c70cb
LG		 2610 *
2611 * Unregister regulator event notifier block.
2612 */
2613int regulator_unregister_notifier(struct regulator *regulator,
2614 struct notifier_block *nb)
2615{
2616 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2617 nb);
2618}
2619EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2620
b136fb44
JC		 2621/* notify regulator consumers and downstream regulator consumers.
2622 * Note mutex must be held by caller.
2623 */
414c70cb
LG		 2624static void _notifier_call_chain(struct regulator_dev *rdev,
2625 unsigned long event, void *data)
2626{
414c70cb 2627 /* call rdev chain first */
414c70cb 2628 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
414c70cb
LG		 2629}
2630
2631/**
2632 * regulator_bulk_get - get multiple regulator consumers
2633 *
2634 * @dev: Device to supply
2635 * @num_consumers: Number of consumers to register
2636 * @consumers: Configuration of consumers; clients are stored here.
2637 *
2638 * @return 0 on success, an errno on failure.
2639 *
2640 * This helper function allows drivers to get several regulator
2641 * consumers in one operation. If any of the regulators cannot be
2642 * acquired then any regulators that were allocated will be freed
2643 * before returning to the caller.
2644 */
2645int regulator_bulk_get(struct device *dev, int num_consumers,
2646 struct regulator_bulk_data *consumers)
2647{
2648 int i;
2649 int ret;
2650
2651 for (i = 0; i < num_consumers; i++)
2652 consumers[i].consumer = NULL;
2653
2654 for (i = 0; i < num_consumers; i++) {
2655 consumers[i].consumer = regulator_get(dev,
2656 consumers[i].supply);
2657 if (IS_ERR(consumers[i].consumer)) {
414c70cb 2658 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 2659 dev_err(dev, "Failed to get supply '%s': %d\n",
2660 consumers[i].supply, ret);
414c70cb
LG		 2661 consumers[i].consumer = NULL;
2662 goto err;
2663 }
2664 }
2665
2666 return 0;
2667
2668err:
b29c7690 2669 while (--i >= 0)
414c70cb
LG		 2670 regulator_put(consumers[i].consumer);
2671
2672 return ret;
2673}
2674EXPORT_SYMBOL_GPL(regulator_bulk_get);
2675
e6e74030
MB		 2676/**
2677 * devm_regulator_bulk_get - managed get multiple regulator consumers
2678 *
2679 * @dev: Device to supply
2680 * @num_consumers: Number of consumers to register
2681 * @consumers: Configuration of consumers; clients are stored here.
2682 *
2683 * @return 0 on success, an errno on failure.
2684 *
2685 * This helper function allows drivers to get several regulator
2686 * consumers in one operation with management, the regulators will
2687 * automatically be freed when the device is unbound. If any of the
2688 * regulators cannot be acquired then any regulators that were
2689 * allocated will be freed before returning to the caller.
2690 */
2691int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2692 struct regulator_bulk_data *consumers)
2693{
2694 int i;
2695 int ret;
2696
2697 for (i = 0; i < num_consumers; i++)
2698 consumers[i].consumer = NULL;
2699
2700 for (i = 0; i < num_consumers; i++) {
2701 consumers[i].consumer = devm_regulator_get(dev,
2702 consumers[i].supply);
2703 if (IS_ERR(consumers[i].consumer)) {
2704 ret = PTR_ERR(consumers[i].consumer);
2705 dev_err(dev, "Failed to get supply '%s': %d\n",
2706 consumers[i].supply, ret);
2707 consumers[i].consumer = NULL;
2708 goto err;
2709 }
2710 }
2711
2712 return 0;
2713
2714err:
2715 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2716 devm_regulator_put(consumers[i].consumer);
2717
2718 return ret;
2719}
2720EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2721
f21e0e81
MB		 2722static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2723{
2724 struct regulator_bulk_data *bulk = data;
2725
2726 bulk->ret = regulator_enable(bulk->consumer);
2727}
2728
414c70cb
LG		 2729/**
2730 * regulator_bulk_enable - enable multiple regulator consumers
2731 *
2732 * @num_consumers: Number of consumers
2733 * @consumers: Consumer data; clients are stored here.
2734 * @return 0 on success, an errno on failure
2735 *
2736 * This convenience API allows consumers to enable multiple regulator
2737 * clients in a single API call. If any consumers cannot be enabled
2738 * then any others that were enabled will be disabled again prior to
2739 * return.
2740 */
2741int regulator_bulk_enable(int num_consumers,
2742 struct regulator_bulk_data *consumers)
2743{
f21e0e81 2744 LIST_HEAD(async_domain);
414c70cb 2745 int i;
f21e0e81 2746 int ret = 0;
414c70cb 2747
6492bc1b
MB		 2748 for (i = 0; i < num_consumers; i++) {
2749 if (consumers[i].consumer->always_on)
2750 consumers[i].ret = 0;
2751 else
2752 async_schedule_domain(regulator_bulk_enable_async,
2753 &consumers[i], &async_domain);
2754 }
f21e0e81
MB		 2755
2756 async_synchronize_full_domain(&async_domain);
2757
2758 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 2759 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 2760 if (consumers[i].ret != 0) {
2761 ret = consumers[i].ret;
414c70cb 2762 goto err;
f21e0e81 2763 }
414c70cb
LG		 2764 }
2765
2766 return 0;
2767
2768err:
b29c7690
AL		 2769 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2770 while (--i >= 0)
2771 regulator_disable(consumers[i].consumer);
414c70cb
LG		 2772
2773 return ret;
2774}
2775EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2776
2777/**
2778 * regulator_bulk_disable - disable multiple regulator consumers
2779 *
2780 * @num_consumers: Number of consumers
2781 * @consumers: Consumer data; clients are stored here.
2782 * @return 0 on success, an errno on failure
2783 *
2784 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 2785 * clients in a single API call. If any consumers cannot be disabled
2786 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 2787 * return.
2788 */
2789int regulator_bulk_disable(int num_consumers,
2790 struct regulator_bulk_data *consumers)
2791{
2792 int i;
01e86f49 2793 int ret, r;
414c70cb 2794
49e22632 2795 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 2796 ret = regulator_disable(consumers[i].consumer);
2797 if (ret != 0)
2798 goto err;
2799 }
2800
2801 return 0;
2802
2803err:
5da84fd9 2804 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
01e86f49
MB		 2805 for (++i; i < num_consumers; ++i) {
2806 r = regulator_enable(consumers[i].consumer);
2807 if (r != 0)
2808 pr_err("Failed to reename %s: %d\n",
2809 consumers[i].supply, r);
2810 }
414c70cb
LG		 2811
2812 return ret;
2813}
2814EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2815
e1de2f42
DK		 2816/**
2817 * regulator_bulk_force_disable - force disable multiple regulator consumers
2818 *
2819 * @num_consumers: Number of consumers
2820 * @consumers: Consumer data; clients are stored here.
2821 * @return 0 on success, an errno on failure
2822 *
2823 * This convenience API allows consumers to forcibly disable multiple regulator
2824 * clients in a single API call.
2825 * NOTE: This should be used for situations when device damage will
2826 * likely occur if the regulators are not disabled (e.g. over temp).
2827 * Although regulator_force_disable function call for some consumers can
2828 * return error numbers, the function is called for all consumers.
2829 */
2830int regulator_bulk_force_disable(int num_consumers,
2831 struct regulator_bulk_data *consumers)
2832{
2833 int i;
2834 int ret;
2835
2836 for (i = 0; i < num_consumers; i++)
2837 consumers[i].ret =
2838 regulator_force_disable(consumers[i].consumer);
2839
2840 for (i = 0; i < num_consumers; i++) {
2841 if (consumers[i].ret != 0) {
2842 ret = consumers[i].ret;
2843 goto out;
2844 }
2845 }
2846
2847 return 0;
2848out:
2849 return ret;
2850}
2851EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
2852
414c70cb
LG		 2853/**
2854 * regulator_bulk_free - free multiple regulator consumers
2855 *
2856 * @num_consumers: Number of consumers
2857 * @consumers: Consumer data; clients are stored here.
2858 *
2859 * This convenience API allows consumers to free multiple regulator
2860 * clients in a single API call.
2861 */
2862void regulator_bulk_free(int num_consumers,
2863 struct regulator_bulk_data *consumers)
2864{
2865 int i;
2866
2867 for (i = 0; i < num_consumers; i++) {
2868 regulator_put(consumers[i].consumer);
2869 consumers[i].consumer = NULL;
2870 }
2871}
2872EXPORT_SYMBOL_GPL(regulator_bulk_free);
2873
2874/**
2875 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 2876 * @rdev: regulator source
414c70cb 2877 * @event: notifier block
69279fb9 2878 * @data: callback-specific data.
414c70cb
LG		 2879 *
2880 * Called by regulator drivers to notify clients a regulator event has
2881 * occurred. We also notify regulator clients downstream.
b136fb44 2882 * Note lock must be held by caller.
414c70cb
LG		 2883 */
2884int regulator_notifier_call_chain(struct regulator_dev *rdev,
2885 unsigned long event, void *data)
2886{
2887 _notifier_call_chain(rdev, event, data);
2888 return NOTIFY_DONE;
2889
2890}
2891EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2892
be721979
MB		 2893/**
2894 * regulator_mode_to_status - convert a regulator mode into a status
2895 *
2896 * @mode: Mode to convert
2897 *
2898 * Convert a regulator mode into a status.
2899 */
2900int regulator_mode_to_status(unsigned int mode)
2901{
2902 switch (mode) {
2903 case REGULATOR_MODE_FAST:
2904 return REGULATOR_STATUS_FAST;
2905 case REGULATOR_MODE_NORMAL:
2906 return REGULATOR_STATUS_NORMAL;
2907 case REGULATOR_MODE_IDLE:
2908 return REGULATOR_STATUS_IDLE;
2909 case REGULATOR_STATUS_STANDBY:
2910 return REGULATOR_STATUS_STANDBY;
2911 default:
2912 return 0;
2913 }
2914}
2915EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2916
7ad68e2f
DB		 2917/*
2918 * To avoid cluttering sysfs (and memory) with useless state, only
2919 * create attributes that can be meaningfully displayed.
2920 */
2921static int add_regulator_attributes(struct regulator_dev *rdev)
2922{
2923 struct device *dev = &rdev->dev;
2924 struct regulator_ops *ops = rdev->desc->ops;
2925 int status = 0;
2926
2927 /* some attributes need specific methods to be displayed */
4c78899b
MB		 2928 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
2929 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
7ad68e2f
DB		 2930 status = device_create_file(dev, &dev_attr_microvolts);
2931 if (status < 0)
2932 return status;
2933 }
2934 if (ops->get_current_limit) {
2935 status = device_create_file(dev, &dev_attr_microamps);
2936 if (status < 0)
2937 return status;
2938 }
2939 if (ops->get_mode) {
2940 status = device_create_file(dev, &dev_attr_opmode);
2941 if (status < 0)
2942 return status;
2943 }
2944 if (ops->is_enabled) {
2945 status = device_create_file(dev, &dev_attr_state);
2946 if (status < 0)
2947 return status;
2948 }
853116a1
DB		 2949 if (ops->get_status) {
2950 status = device_create_file(dev, &dev_attr_status);
2951 if (status < 0)
2952 return status;
2953 }
7ad68e2f
DB		 2954
2955 /* some attributes are type-specific */
2956 if (rdev->desc->type == REGULATOR_CURRENT) {
2957 status = device_create_file(dev, &dev_attr_requested_microamps);
2958 if (status < 0)
2959 return status;
2960 }
2961
2962 /* all the other attributes exist to support constraints;
2963 * don't show them if there are no constraints, or if the
2964 * relevant supporting methods are missing.
2965 */
2966 if (!rdev->constraints)
2967 return status;
2968
2969 /* constraints need specific supporting methods */
e8eef82b 2970 if (ops->set_voltage || ops->set_voltage_sel) {
7ad68e2f
DB		 2971 status = device_create_file(dev, &dev_attr_min_microvolts);
2972 if (status < 0)
2973 return status;
2974 status = device_create_file(dev, &dev_attr_max_microvolts);
2975 if (status < 0)
2976 return status;
2977 }
2978 if (ops->set_current_limit) {
2979 status = device_create_file(dev, &dev_attr_min_microamps);
2980 if (status < 0)
2981 return status;
2982 status = device_create_file(dev, &dev_attr_max_microamps);
2983 if (status < 0)
2984 return status;
2985 }
2986
7ad68e2f
DB		 2987 status = device_create_file(dev, &dev_attr_suspend_standby_state);
2988 if (status < 0)
2989 return status;
2990 status = device_create_file(dev, &dev_attr_suspend_mem_state);
2991 if (status < 0)
2992 return status;
2993 status = device_create_file(dev, &dev_attr_suspend_disk_state);
2994 if (status < 0)
2995 return status;
2996
2997 if (ops->set_suspend_voltage) {
2998 status = device_create_file(dev,
2999 &dev_attr_suspend_standby_microvolts);
3000 if (status < 0)
3001 return status;
3002 status = device_create_file(dev,
3003 &dev_attr_suspend_mem_microvolts);
3004 if (status < 0)
3005 return status;
3006 status = device_create_file(dev,
3007 &dev_attr_suspend_disk_microvolts);
3008 if (status < 0)
3009 return status;
3010 }
3011
3012 if (ops->set_suspend_mode) {
3013 status = device_create_file(dev,
3014 &dev_attr_suspend_standby_mode);
3015 if (status < 0)
3016 return status;
3017 status = device_create_file(dev,
3018 &dev_attr_suspend_mem_mode);
3019 if (status < 0)
3020 return status;
3021 status = device_create_file(dev,
3022 &dev_attr_suspend_disk_mode);
3023 if (status < 0)
3024 return status;
3025 }
3026
3027 return status;
3028}
3029
1130e5b3
MB		 3030static void rdev_init_debugfs(struct regulator_dev *rdev)
3031{
1130e5b3 3032 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
24751434 3033 if (!rdev->debugfs) {
1130e5b3 3034 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 3035 return;
3036 }
3037
3038 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3039 &rdev->use_count);
3040 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3041 &rdev->open_count);
1130e5b3
MB		 3042}
3043
414c70cb
LG		 3044/**
3045 * regulator_register - register regulator
69279fb9 3046 * @regulator_desc: regulator to register
c172708d 3047 * @config: runtime configuration for regulator
414c70cb
LG		 3048 *
3049 * Called by regulator drivers to register a regulator.
3050 * Returns 0 on success.
3051 */
65f26846
MB		 3052struct regulator_dev *
3053regulator_register(const struct regulator_desc *regulator_desc,
c172708d 3054 const struct regulator_config *config)
414c70cb 3055{
9a8f5e07 3056 const struct regulation_constraints *constraints = NULL;
c172708d 3057 const struct regulator_init_data *init_data;
414c70cb
LG		 3058 static atomic_t regulator_no = ATOMIC_INIT(0);
3059 struct regulator_dev *rdev;
32c8fad4 3060 struct device *dev;
a5766f11 3061 int ret, i;
69511a45 3062 const char *supply = NULL;
414c70cb 3063
c172708d 3064 if (regulator_desc == NULL || config == NULL)
414c70cb
LG		 3065 return ERR_PTR(-EINVAL);
3066
32c8fad4 3067 dev = config->dev;
dcf70112 3068 WARN_ON(!dev);
32c8fad4 3069
414c70cb
LG		 3070 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3071 return ERR_PTR(-EINVAL);
3072
cd78dfc6
DL		 3073 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3074 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 3075 return ERR_PTR(-EINVAL);
3076
476c2d83
MB		 3077 /* Only one of each should be implemented */
3078 WARN_ON(regulator_desc->ops->get_voltage &&
3079 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 3080 WARN_ON(regulator_desc->ops->set_voltage &&
3081 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 3082
3083 /* If we're using selectors we must implement list_voltage. */
3084 if (regulator_desc->ops->get_voltage_sel &&
3085 !regulator_desc->ops->list_voltage) {
3086 return ERR_PTR(-EINVAL);
3087 }
e8eef82b
MB		 3088 if (regulator_desc->ops->set_voltage_sel &&
3089 !regulator_desc->ops->list_voltage) {
3090 return ERR_PTR(-EINVAL);
3091 }
476c2d83 3092
c172708d
MB		 3093 init_data = config->init_data;
3094
414c70cb
LG		 3095 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3096 if (rdev == NULL)
3097 return ERR_PTR(-ENOMEM);
3098
3099 mutex_lock(&regulator_list_mutex);
3100
3101 mutex_init(&rdev->mutex);
c172708d 3102 rdev->reg_data = config->driver_data;
414c70cb
LG		 3103 rdev->owner = regulator_desc->owner;
3104 rdev->desc = regulator_desc;
65b19ce6 3105 rdev->regmap = config->regmap;
414c70cb 3106 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 3107 INIT_LIST_HEAD(&rdev->list);
414c70cb 3108 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 3109 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 3110
a5766f11 3111 /* preform any regulator specific init */
9a8f5e07 3112 if (init_data && init_data->regulator_init) {
a5766f11 3113 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 3114 if (ret < 0)
3115 goto clean;
a5766f11
LG		 3116 }
3117
a5766f11 3118 /* register with sysfs */
414c70cb 3119 rdev->dev.class = &regulator_class;
c172708d 3120 rdev->dev.of_node = config->of_node;
a5766f11 3121 rdev->dev.parent = dev;
812460a9
KS		 3122 dev_set_name(&rdev->dev, "regulator.%d",
3123 atomic_inc_return(&regulator_no) - 1);
a5766f11 3124 ret = device_register(&rdev->dev);
ad7725cb
VK		 3125 if (ret != 0) {
3126 put_device(&rdev->dev);
4fca9545 3127 goto clean;
ad7725cb 3128 }
a5766f11
LG		 3129
3130 dev_set_drvdata(&rdev->dev, rdev);
3131
74f544c1 3132 /* set regulator constraints */
9a8f5e07
MB		 3133 if (init_data)
3134 constraints = &init_data->constraints;
3135
3136 ret = set_machine_constraints(rdev, constraints);
74f544c1
MR		 3137 if (ret < 0)
3138 goto scrub;
3139
7ad68e2f
DB		 3140 /* add attributes supported by this regulator */
3141 ret = add_regulator_attributes(rdev);
3142 if (ret < 0)
3143 goto scrub;
3144
9a8f5e07 3145 if (init_data && init_data->supply_regulator)
69511a45
RN		 3146 supply = init_data->supply_regulator;
3147 else if (regulator_desc->supply_name)
3148 supply = regulator_desc->supply_name;
3149
3150 if (supply) {
0178f3e2 3151 struct regulator_dev *r;
0178f3e2 3152
6d191a5f 3153 r = regulator_dev_lookup(dev, supply, &ret);
0178f3e2 3154
69511a45
RN		 3155 if (!r) {
3156 dev_err(dev, "Failed to find supply %s\n", supply);
04bf3011 3157 ret = -EPROBE_DEFER;
0178f3e2
MB		 3158 goto scrub;
3159 }
3160
3161 ret = set_supply(rdev, r);
3162 if (ret < 0)
3163 goto scrub;
b2296bd4
LD		 3164
3165 /* Enable supply if rail is enabled */
b1a86831 3166 if (_regulator_is_enabled(rdev)) {
b2296bd4
LD		 3167 ret = regulator_enable(rdev->supply);
3168 if (ret < 0)
3169 goto scrub;
3170 }
0178f3e2
MB		 3171 }
3172
a5766f11 3173 /* add consumers devices */
9a8f5e07
MB		 3174 if (init_data) {
3175 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3176 ret = set_consumer_device_supply(rdev,
9a8f5e07 3177 init_data->consumer_supplies[i].dev_name,
23c2f041 3178 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 3179 if (ret < 0) {
3180 dev_err(dev, "Failed to set supply %s\n",
3181 init_data->consumer_supplies[i].supply);
3182 goto unset_supplies;
3183 }
23c2f041 3184 }
414c70cb 3185 }
a5766f11
LG		 3186
3187 list_add(&rdev->list, &regulator_list);
1130e5b3
MB		 3188
3189 rdev_init_debugfs(rdev);
a5766f11 3190out:
414c70cb
LG		 3191 mutex_unlock(&regulator_list_mutex);
3192 return rdev;
4fca9545 3193
d4033b54
JN		 3194unset_supplies:
3195 unset_regulator_supplies(rdev);
3196
4fca9545 3197scrub:
e81dba85
MB		 3198 if (rdev->supply)
3199 regulator_put(rdev->supply);
1a6958e7 3200 kfree(rdev->constraints);
4fca9545 3201 device_unregister(&rdev->dev);
53032daf
PW		 3202 /* device core frees rdev */
3203 rdev = ERR_PTR(ret);
3204 goto out;
3205
4fca9545
DB		 3206clean:
3207 kfree(rdev);
3208 rdev = ERR_PTR(ret);
3209 goto out;
414c70cb
LG		 3210}
3211EXPORT_SYMBOL_GPL(regulator_register);
3212
3213/**
3214 * regulator_unregister - unregister regulator
69279fb9 3215 * @rdev: regulator to unregister
414c70cb
LG		 3216 *
3217 * Called by regulator drivers to unregister a regulator.
3218 */
3219void regulator_unregister(struct regulator_dev *rdev)
3220{
3221 if (rdev == NULL)
3222 return;
3223
e032b376
MB		 3224 if (rdev->supply)
3225 regulator_put(rdev->supply);
414c70cb 3226 mutex_lock(&regulator_list_mutex);
1130e5b3 3227 debugfs_remove_recursive(rdev->debugfs);
da07ecd9 3228 flush_work_sync(&rdev->disable_work.work);
6bf87d17 3229 WARN_ON(rdev->open_count);
0f1d747b 3230 unset_regulator_supplies(rdev);
414c70cb 3231 list_del(&rdev->list);
f8c12fe3 3232 kfree(rdev->constraints);
58fb5cf5 3233 device_unregister(&rdev->dev);
414c70cb
LG		 3234 mutex_unlock(&regulator_list_mutex);
3235}
3236EXPORT_SYMBOL_GPL(regulator_unregister);
3237
414c70cb 3238/**
cf7bbcdf 3239 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 3240 * @state: system suspend state
3241 *
3242 * Configure each regulator with it's suspend operating parameters for state.
3243 * This will usually be called by machine suspend code prior to supending.
3244 */
3245int regulator_suspend_prepare(suspend_state_t state)
3246{
3247 struct regulator_dev *rdev;
3248 int ret = 0;
3249
3250 /* ON is handled by regulator active state */
3251 if (state == PM_SUSPEND_ON)
3252 return -EINVAL;
3253
3254 mutex_lock(&regulator_list_mutex);
3255 list_for_each_entry(rdev, &regulator_list, list) {
3256
3257 mutex_lock(&rdev->mutex);
3258 ret = suspend_prepare(rdev, state);
3259 mutex_unlock(&rdev->mutex);
3260
3261 if (ret < 0) {
5da84fd9 3262 rdev_err(rdev, "failed to prepare\n");
414c70cb
LG		 3263 goto out;
3264 }
3265 }
3266out:
3267 mutex_unlock(&regulator_list_mutex);
3268 return ret;
3269}
3270EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3271
7a32b589
MH		 3272/**
3273 * regulator_suspend_finish - resume regulators from system wide suspend
3274 *
3275 * Turn on regulators that might be turned off by regulator_suspend_prepare
3276 * and that should be turned on according to the regulators properties.
3277 */
3278int regulator_suspend_finish(void)
3279{
3280 struct regulator_dev *rdev;
3281 int ret = 0, error;
3282
3283 mutex_lock(&regulator_list_mutex);
3284 list_for_each_entry(rdev, &regulator_list, list) {
3285 struct regulator_ops *ops = rdev->desc->ops;
3286
3287 mutex_lock(&rdev->mutex);
3288 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3289 ops->enable) {
3290 error = ops->enable(rdev);
3291 if (error)
3292 ret = error;
3293 } else {
3294 if (!has_full_constraints)
3295 goto unlock;
3296 if (!ops->disable)
3297 goto unlock;
b1a86831 3298 if (!_regulator_is_enabled(rdev))
7a32b589
MH		 3299 goto unlock;
3300
3301 error = ops->disable(rdev);
3302 if (error)
3303 ret = error;
3304 }
3305unlock:
3306 mutex_unlock(&rdev->mutex);
3307 }
3308 mutex_unlock(&regulator_list_mutex);
3309 return ret;
3310}
3311EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3312
ca725561
MB		 3313/**
3314 * regulator_has_full_constraints - the system has fully specified constraints
3315 *
3316 * Calling this function will cause the regulator API to disable all
3317 * regulators which have a zero use count and don't have an always_on
3318 * constraint in a late_initcall.
3319 *
3320 * The intention is that this will become the default behaviour in a
3321 * future kernel release so users are encouraged to use this facility
3322 * now.
3323 */
3324void regulator_has_full_constraints(void)
3325{
3326 has_full_constraints = 1;
3327}
3328EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3329
688fe99a
MB		 3330/**
3331 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3332 *
3333 * Calling this function will cause the regulator API to provide a
3334 * dummy regulator to consumers if no physical regulator is found,
3335 * allowing most consumers to proceed as though a regulator were
3336 * configured. This allows systems such as those with software
3337 * controllable regulators for the CPU core only to be brought up more
3338 * readily.
3339 */
3340void regulator_use_dummy_regulator(void)
3341{
3342 board_wants_dummy_regulator = true;
3343}
3344EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3345
414c70cb
LG		 3346/**
3347 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 3348 * @rdev: regulator
414c70cb
LG		 3349 *
3350 * Get rdev regulator driver private data. This call can be used in the
3351 * regulator driver context.
3352 */
3353void *rdev_get_drvdata(struct regulator_dev *rdev)
3354{
3355 return rdev->reg_data;
3356}
3357EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3358
3359/**
3360 * regulator_get_drvdata - get regulator driver data
3361 * @regulator: regulator
3362 *
3363 * Get regulator driver private data. This call can be used in the consumer
3364 * driver context when non API regulator specific functions need to be called.
3365 */
3366void *regulator_get_drvdata(struct regulator *regulator)
3367{
3368 return regulator->rdev->reg_data;
3369}
3370EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3371
3372/**
3373 * regulator_set_drvdata - set regulator driver data
3374 * @regulator: regulator
3375 * @data: data
3376 */
3377void regulator_set_drvdata(struct regulator *regulator, void *data)
3378{
3379 regulator->rdev->reg_data = data;
3380}
3381EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3382
3383/**
3384 * regulator_get_id - get regulator ID
69279fb9 3385 * @rdev: regulator
414c70cb
LG		 3386 */
3387int rdev_get_id(struct regulator_dev *rdev)
3388{
3389 return rdev->desc->id;
3390}
3391EXPORT_SYMBOL_GPL(rdev_get_id);
3392
a5766f11
LG		 3393struct device *rdev_get_dev(struct regulator_dev *rdev)
3394{
3395 return &rdev->dev;
3396}
3397EXPORT_SYMBOL_GPL(rdev_get_dev);
3398
3399void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3400{
3401 return reg_init_data->driver_data;
3402}
3403EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3404
ba55a974
MB		 3405#ifdef CONFIG_DEBUG_FS
3406static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3407 size_t count, loff_t *ppos)
3408{
3409 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3410 ssize_t len, ret = 0;
3411 struct regulator_map *map;
3412
3413 if (!buf)
3414 return -ENOMEM;
3415
3416 list_for_each_entry(map, &regulator_map_list, list) {
3417 len = snprintf(buf + ret, PAGE_SIZE - ret,
3418 "%s -> %s.%s\n",
3419 rdev_get_name(map->regulator), map->dev_name,
3420 map->supply);
3421 if (len >= 0)
3422 ret += len;
3423 if (ret > PAGE_SIZE) {
3424 ret = PAGE_SIZE;
3425 break;
3426 }
3427 }
3428
3429 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3430
3431 kfree(buf);
3432
3433 return ret;
3434}
24751434 3435#endif
ba55a974
MB		 3436
3437static const struct file_operations supply_map_fops = {
24751434 3438#ifdef CONFIG_DEBUG_FS
ba55a974
MB		 3439 .read = supply_map_read_file,
3440 .llseek = default_llseek,
ba55a974 3441#endif
24751434 3442};
ba55a974 3443
414c70cb
LG		 3444static int __init regulator_init(void)
3445{
34abbd68
MB		 3446 int ret;
3447
34abbd68
MB		 3448 ret = class_register(&regulator_class);
3449
1130e5b3 3450 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 3451 if (!debugfs_root)
1130e5b3 3452 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 3453
f4d562c6
MB		 3454 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3455 &supply_map_fops);
1130e5b3 3456
34abbd68
MB		 3457 regulator_dummy_init();
3458
3459 return ret;
414c70cb
LG		 3460}
3461
3462/* init early to allow our consumers to complete system booting */
3463core_initcall(regulator_init);
ca725561
MB		 3464
3465static int __init regulator_init_complete(void)
3466{
3467 struct regulator_dev *rdev;
3468 struct regulator_ops *ops;
3469 struct regulation_constraints *c;
3470 int enabled, ret;
ca725561
MB		 3471
3472 mutex_lock(&regulator_list_mutex);
3473
3474 /* If we have a full configuration then disable any regulators
3475 * which are not in use or always_on. This will become the
3476 * default behaviour in the future.
3477 */
3478 list_for_each_entry(rdev, &regulator_list, list) {
3479 ops = rdev->desc->ops;
3480 c = rdev->constraints;
3481
f25e0b4f 3482 if (!ops->disable || (c && c->always_on))
ca725561
MB		 3483 continue;
3484
3485 mutex_lock(&rdev->mutex);
3486
3487 if (rdev->use_count)
3488 goto unlock;
3489
3490 /* If we can't read the status assume it's on. */
3491 if (ops->is_enabled)
3492 enabled = ops->is_enabled(rdev);
3493 else
3494 enabled = 1;
3495
3496 if (!enabled)
3497 goto unlock;
3498
3499 if (has_full_constraints) {
3500 /* We log since this may kill the system if it
3501 * goes wrong. */
5da84fd9 3502 rdev_info(rdev, "disabling\n");
ca725561
MB		 3503 ret = ops->disable(rdev);
3504 if (ret != 0) {
5da84fd9 3505 rdev_err(rdev, "couldn't disable: %d\n", ret);
ca725561
MB		 3506 }
3507 } else {
3508 /* The intention is that in future we will
3509 * assume that full constraints are provided
3510 * so warn even if we aren't going to do
3511 * anything here.
3512 */
5da84fd9 3513 rdev_warn(rdev, "incomplete constraints, leaving on\n");
ca725561
MB		 3514 }
3515
3516unlock:
3517 mutex_unlock(&rdev->mutex);
3518 }
3519
3520 mutex_unlock(&regulator_list_mutex);
3521
3522 return 0;
3523}
3524late_initcall(regulator_init_complete);
Linux 6.x block layer and io_uring tree(s)