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regulator: core: Propagate voltage changes to supply regulators
[deliverable/linux.git] / drivers / regulator / core.c
CommitLineData
414c70cb
LG		 1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
a5766f11 5 * Copyright 2008 SlimLogic Ltd.
414c70cb 6 *
a5766f11 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
414c70cb
LG		 8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
1130e5b3 18#include <linux/debugfs.h>
414c70cb 19#include <linux/device.h>
5a0e3ad6 20#include <linux/slab.h>
f21e0e81 21#include <linux/async.h>
414c70cb
LG		 22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
31aae2be 25#include <linux/delay.h>
65f73508 26#include <linux/gpio.h>
778b28b4 27#include <linux/gpio/consumer.h>
69511a45 28#include <linux/of.h>
65b19ce6 29#include <linux/regmap.h>
69511a45 30#include <linux/regulator/of_regulator.h>
414c70cb
LG		 31#include <linux/regulator/consumer.h>
32#include <linux/regulator/driver.h>
33#include <linux/regulator/machine.h>
65602c32 34#include <linux/module.h>
414c70cb 35
02fa3ec0
MB		 36#define CREATE_TRACE_POINTS
37#include <trace/events/regulator.h>
38
34abbd68 39#include "dummy.h"
0cdfcc0f 40#include "internal.h"
34abbd68 41
7d51a0db
MB		 42#define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
5da84fd9
JP		 44#define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50#define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
52
414c70cb
LG		 53static DEFINE_MUTEX(regulator_list_mutex);
54static LIST_HEAD(regulator_list);
55static LIST_HEAD(regulator_map_list);
f19b00da 56static LIST_HEAD(regulator_ena_gpio_list);
a06ccd9c 57static LIST_HEAD(regulator_supply_alias_list);
21cf891a 58static bool has_full_constraints;
414c70cb 59
1130e5b3 60static struct dentry *debugfs_root;
1130e5b3 61
8dc5390d 62/*
414c70cb
LG		 63 * struct regulator_map
64 *
65 * Used to provide symbolic supply names to devices.
66 */
67struct regulator_map {
68 struct list_head list;
40f9244f 69 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 70 const char *supply;
a5766f11 71 struct regulator_dev *regulator;
414c70cb
LG		 72};
73
f19b00da
KM		 74/*
75 * struct regulator_enable_gpio
76 *
77 * Management for shared enable GPIO pin
78 */
79struct regulator_enable_gpio {
80 struct list_head list;
778b28b4 81 struct gpio_desc *gpiod;
f19b00da
KM		 82 u32 enable_count; /* a number of enabled shared GPIO */
83 u32 request_count; /* a number of requested shared GPIO */
84 unsigned int ena_gpio_invert:1;
85};
86
a06ccd9c
CK		 87/*
88 * struct regulator_supply_alias
89 *
90 * Used to map lookups for a supply onto an alternative device.
91 */
92struct regulator_supply_alias {
93 struct list_head list;
94 struct device *src_dev;
95 const char *src_supply;
96 struct device *alias_dev;
97 const char *alias_supply;
98};
99
414c70cb 100static int _regulator_is_enabled(struct regulator_dev *rdev);
3801b86a 101static int _regulator_disable(struct regulator_dev *rdev);
414c70cb
LG		 102static int _regulator_get_voltage(struct regulator_dev *rdev);
103static int _regulator_get_current_limit(struct regulator_dev *rdev);
104static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
7179569a 105static int _notifier_call_chain(struct regulator_dev *rdev,
414c70cb 106 unsigned long event, void *data);
75790251
MB		 107static int _regulator_do_set_voltage(struct regulator_dev *rdev,
108 int min_uV, int max_uV);
3801b86a
MB		 109static struct regulator *create_regulator(struct regulator_dev *rdev,
110 struct device *dev,
111 const char *supply_name);
36a1f1b6 112static void _regulator_put(struct regulator *regulator);
414c70cb 113
609ca5f3
MB		 114static struct regulator_dev *dev_to_rdev(struct device *dev)
115{
116 return container_of(dev, struct regulator_dev, dev);
117}
414c70cb 118
1083c393
MB		 119static const char *rdev_get_name(struct regulator_dev *rdev)
120{
121 if (rdev->constraints && rdev->constraints->name)
122 return rdev->constraints->name;
123 else if (rdev->desc->name)
124 return rdev->desc->name;
125 else
126 return "";
127}
128
87b28417
MB		 129static bool have_full_constraints(void)
130{
75bc9641 131 return has_full_constraints || of_have_populated_dt();
87b28417
MB		 132}
133
9f01cd4a
SH		 134/**
135 * regulator_lock_supply - lock a regulator and its supplies
136 * @rdev: regulator source
137 */
138static void regulator_lock_supply(struct regulator_dev *rdev)
139{
140 struct regulator *supply;
141 int i = 0;
142
143 while (1) {
144 mutex_lock_nested(&rdev->mutex, i++);
145 supply = rdev->supply;
146
147 if (!rdev->supply)
148 return;
149
150 rdev = supply->rdev;
151 }
152}
153
154/**
155 * regulator_unlock_supply - unlock a regulator and its supplies
156 * @rdev: regulator source
157 */
158static void regulator_unlock_supply(struct regulator_dev *rdev)
159{
160 struct regulator *supply;
161
162 while (1) {
163 mutex_unlock(&rdev->mutex);
164 supply = rdev->supply;
165
166 if (!rdev->supply)
167 return;
168
169 rdev = supply->rdev;
170 }
171}
172
69511a45
RN		 173/**
174 * of_get_regulator - get a regulator device node based on supply name
175 * @dev: Device pointer for the consumer (of regulator) device
176 * @supply: regulator supply name
177 *
178 * Extract the regulator device node corresponding to the supply name.
167d41dc 179 * returns the device node corresponding to the regulator if found, else
69511a45
RN		 180 * returns NULL.
181 */
182static struct device_node *of_get_regulator(struct device *dev, const char *supply)
183{
184 struct device_node *regnode = NULL;
185 char prop_name[32]; /* 32 is max size of property name */
186
187 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
188
189 snprintf(prop_name, 32, "%s-supply", supply);
190 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
191
192 if (!regnode) {
16fbcc3b 193 dev_dbg(dev, "Looking up %s property in node %s failed",
69511a45
RN		 194 prop_name, dev->of_node->full_name);
195 return NULL;
196 }
197 return regnode;
198}
199
6492bc1b
MB		 200static int _regulator_can_change_status(struct regulator_dev *rdev)
201{
202 if (!rdev->constraints)
203 return 0;
204
205 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
206 return 1;
207 else
208 return 0;
209}
210
414c70cb
LG		 211/* Platform voltage constraint check */
212static int regulator_check_voltage(struct regulator_dev *rdev,
213 int *min_uV, int *max_uV)
214{
215 BUG_ON(*min_uV > *max_uV);
216
217 if (!rdev->constraints) {
5da84fd9 218 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 219 return -ENODEV;
220 }
221 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
5da84fd9 222 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 223 return -EPERM;
224 }
225
226 if (*max_uV > rdev->constraints->max_uV)
227 *max_uV = rdev->constraints->max_uV;
228 if (*min_uV < rdev->constraints->min_uV)
229 *min_uV = rdev->constraints->min_uV;
230
89f425ed
MB		 231 if (*min_uV > *max_uV) {
232 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 233 *min_uV, *max_uV);
414c70cb 234 return -EINVAL;
89f425ed 235 }
414c70cb
LG		 236
237 return 0;
238}
239
05fda3b1
TP		 240/* Make sure we select a voltage that suits the needs of all
241 * regulator consumers
242 */
243static int regulator_check_consumers(struct regulator_dev *rdev,
244 int *min_uV, int *max_uV)
245{
246 struct regulator *regulator;
247
248 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4aa922c0
MB		 249 /*
250 * Assume consumers that didn't say anything are OK
251 * with anything in the constraint range.
252 */
253 if (!regulator->min_uV && !regulator->max_uV)
254 continue;
255
05fda3b1
TP		 256 if (*max_uV > regulator->max_uV)
257 *max_uV = regulator->max_uV;
258 if (*min_uV < regulator->min_uV)
259 *min_uV = regulator->min_uV;
260 }
261
dd8004af 262 if (*min_uV > *max_uV) {
9c7b4e8a
RD		 263 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
264 *min_uV, *max_uV);
05fda3b1 265 return -EINVAL;
dd8004af 266 }
05fda3b1
TP		 267
268 return 0;
269}
270
414c70cb
LG		 271/* current constraint check */
272static int regulator_check_current_limit(struct regulator_dev *rdev,
273 int *min_uA, int *max_uA)
274{
275 BUG_ON(*min_uA > *max_uA);
276
277 if (!rdev->constraints) {
5da84fd9 278 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 279 return -ENODEV;
280 }
281 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
5da84fd9 282 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 283 return -EPERM;
284 }
285
286 if (*max_uA > rdev->constraints->max_uA)
287 *max_uA = rdev->constraints->max_uA;
288 if (*min_uA < rdev->constraints->min_uA)
289 *min_uA = rdev->constraints->min_uA;
290
89f425ed
MB		 291 if (*min_uA > *max_uA) {
292 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 293 *min_uA, *max_uA);
414c70cb 294 return -EINVAL;
89f425ed 295 }
414c70cb
LG		 296
297 return 0;
298}
299
300/* operating mode constraint check */
2c608234 301static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 302{
2c608234 303 switch (*mode) {
e573520b
DB		 304 case REGULATOR_MODE_FAST:
305 case REGULATOR_MODE_NORMAL:
306 case REGULATOR_MODE_IDLE:
307 case REGULATOR_MODE_STANDBY:
308 break;
309 default:
89f425ed 310 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 311 return -EINVAL;
312 }
313
414c70cb 314 if (!rdev->constraints) {
5da84fd9 315 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 316 return -ENODEV;
317 }
318 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
5da84fd9 319 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 320 return -EPERM;
321 }
2c608234
MB		 322
323 /* The modes are bitmasks, the most power hungry modes having
324 * the lowest values. If the requested mode isn't supported
325 * try higher modes. */
326 while (*mode) {
327 if (rdev->constraints->valid_modes_mask & *mode)
328 return 0;
329 *mode /= 2;
414c70cb 330 }
2c608234
MB		 331
332 return -EINVAL;
414c70cb
LG		 333}
334
335/* dynamic regulator mode switching constraint check */
336static int regulator_check_drms(struct regulator_dev *rdev)
337{
338 if (!rdev->constraints) {
5da84fd9 339 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 340 return -ENODEV;
341 }
342 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
099982fa 343 rdev_dbg(rdev, "operation not allowed\n");
414c70cb
LG		 344 return -EPERM;
345 }
346 return 0;
347}
348
414c70cb
LG		 349static ssize_t regulator_uV_show(struct device *dev,
350 struct device_attribute *attr, char *buf)
351{
a5766f11 352 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 353 ssize_t ret;
354
355 mutex_lock(&rdev->mutex);
356 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
357 mutex_unlock(&rdev->mutex);
358
359 return ret;
360}
7ad68e2f 361static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 362
363static ssize_t regulator_uA_show(struct device *dev,
364 struct device_attribute *attr, char *buf)
365{
a5766f11 366 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 367
368 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
369}
7ad68e2f 370static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 371
587cea27
GKH		 372static ssize_t name_show(struct device *dev, struct device_attribute *attr,
373 char *buf)
bc558a60
MB		 374{
375 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 376
1083c393 377 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60 378}
587cea27 379static DEVICE_ATTR_RO(name);
bc558a60 380
4fca9545 381static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 382{
414c70cb
LG		 383 switch (mode) {
384 case REGULATOR_MODE_FAST:
385 return sprintf(buf, "fast\n");
386 case REGULATOR_MODE_NORMAL:
387 return sprintf(buf, "normal\n");
388 case REGULATOR_MODE_IDLE:
389 return sprintf(buf, "idle\n");
390 case REGULATOR_MODE_STANDBY:
391 return sprintf(buf, "standby\n");
392 }
393 return sprintf(buf, "unknown\n");
394}
395
4fca9545
DB		 396static ssize_t regulator_opmode_show(struct device *dev,
397 struct device_attribute *attr, char *buf)
414c70cb 398{
a5766f11 399 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 400
4fca9545
DB		 401 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
402}
7ad68e2f 403static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 404
405static ssize_t regulator_print_state(char *buf, int state)
406{
414c70cb
LG		 407 if (state > 0)
408 return sprintf(buf, "enabled\n");
409 else if (state == 0)
410 return sprintf(buf, "disabled\n");
411 else
412 return sprintf(buf, "unknown\n");
413}
414
4fca9545
DB		 415static ssize_t regulator_state_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
417{
418 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 419 ssize_t ret;
420
421 mutex_lock(&rdev->mutex);
422 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
423 mutex_unlock(&rdev->mutex);
4fca9545 424
9332546f 425 return ret;
4fca9545 426}
7ad68e2f 427static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 428
853116a1
DB		 429static ssize_t regulator_status_show(struct device *dev,
430 struct device_attribute *attr, char *buf)
431{
432 struct regulator_dev *rdev = dev_get_drvdata(dev);
433 int status;
434 char *label;
435
436 status = rdev->desc->ops->get_status(rdev);
437 if (status < 0)
438 return status;
439
440 switch (status) {
441 case REGULATOR_STATUS_OFF:
442 label = "off";
443 break;
444 case REGULATOR_STATUS_ON:
445 label = "on";
446 break;
447 case REGULATOR_STATUS_ERROR:
448 label = "error";
449 break;
450 case REGULATOR_STATUS_FAST:
451 label = "fast";
452 break;
453 case REGULATOR_STATUS_NORMAL:
454 label = "normal";
455 break;
456 case REGULATOR_STATUS_IDLE:
457 label = "idle";
458 break;
459 case REGULATOR_STATUS_STANDBY:
460 label = "standby";
461 break;
f59c8f9f
MB		 462 case REGULATOR_STATUS_BYPASS:
463 label = "bypass";
464 break;
1beaf762
KG		 465 case REGULATOR_STATUS_UNDEFINED:
466 label = "undefined";
467 break;
853116a1
DB		 468 default:
469 return -ERANGE;
470 }
471
472 return sprintf(buf, "%s\n", label);
473}
474static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
475
414c70cb
LG		 476static ssize_t regulator_min_uA_show(struct device *dev,
477 struct device_attribute *attr, char *buf)
478{
a5766f11 479 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 480
481 if (!rdev->constraints)
482 return sprintf(buf, "constraint not defined\n");
483
484 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
485}
7ad68e2f 486static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 487
488static ssize_t regulator_max_uA_show(struct device *dev,
489 struct device_attribute *attr, char *buf)
490{
a5766f11 491 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 492
493 if (!rdev->constraints)
494 return sprintf(buf, "constraint not defined\n");
495
496 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
497}
7ad68e2f 498static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 499
500static ssize_t regulator_min_uV_show(struct device *dev,
501 struct device_attribute *attr, char *buf)
502{
a5766f11 503 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 504
505 if (!rdev->constraints)
506 return sprintf(buf, "constraint not defined\n");
507
508 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
509}
7ad68e2f 510static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 511
512static ssize_t regulator_max_uV_show(struct device *dev,
513 struct device_attribute *attr, char *buf)
514{
a5766f11 515 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 516
517 if (!rdev->constraints)
518 return sprintf(buf, "constraint not defined\n");
519
520 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
521}
7ad68e2f 522static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 523
524static ssize_t regulator_total_uA_show(struct device *dev,
525 struct device_attribute *attr, char *buf)
526{
a5766f11 527 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 528 struct regulator *regulator;
529 int uA = 0;
530
531 mutex_lock(&rdev->mutex);
532 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 533 uA += regulator->uA_load;
414c70cb
LG		 534 mutex_unlock(&rdev->mutex);
535 return sprintf(buf, "%d\n", uA);
536}
7ad68e2f 537static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb 538
587cea27
GKH		 539static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
540 char *buf)
414c70cb 541{
a5766f11 542 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 543 return sprintf(buf, "%d\n", rdev->use_count);
544}
587cea27 545static DEVICE_ATTR_RO(num_users);
414c70cb 546
587cea27
GKH		 547static ssize_t type_show(struct device *dev, struct device_attribute *attr,
548 char *buf)
414c70cb 549{
a5766f11 550 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 551
552 switch (rdev->desc->type) {
553 case REGULATOR_VOLTAGE:
554 return sprintf(buf, "voltage\n");
555 case REGULATOR_CURRENT:
556 return sprintf(buf, "current\n");
557 }
558 return sprintf(buf, "unknown\n");
559}
587cea27 560static DEVICE_ATTR_RO(type);
414c70cb
LG		 561
562static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
563 struct device_attribute *attr, char *buf)
564{
a5766f11 565 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 566
414c70cb
LG		 567 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
568}
7ad68e2f
DB		 569static DEVICE_ATTR(suspend_mem_microvolts, 0444,
570 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 571
572static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
573 struct device_attribute *attr, char *buf)
574{
a5766f11 575 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 576
414c70cb
LG		 577 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
578}
7ad68e2f
DB		 579static DEVICE_ATTR(suspend_disk_microvolts, 0444,
580 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 581
582static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
583 struct device_attribute *attr, char *buf)
584{
a5766f11 585 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 586
414c70cb
LG		 587 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
588}
7ad68e2f
DB		 589static DEVICE_ATTR(suspend_standby_microvolts, 0444,
590 regulator_suspend_standby_uV_show, NULL);
414c70cb 591
414c70cb
LG		 592static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
593 struct device_attribute *attr, char *buf)
594{
a5766f11 595 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 596
4fca9545
DB		 597 return regulator_print_opmode(buf,
598 rdev->constraints->state_mem.mode);
414c70cb 599}
7ad68e2f
DB		 600static DEVICE_ATTR(suspend_mem_mode, 0444,
601 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 602
603static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
604 struct device_attribute *attr, char *buf)
605{
a5766f11 606 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 607
4fca9545
DB		 608 return regulator_print_opmode(buf,
609 rdev->constraints->state_disk.mode);
414c70cb 610}
7ad68e2f
DB		 611static DEVICE_ATTR(suspend_disk_mode, 0444,
612 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 613
614static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
615 struct device_attribute *attr, char *buf)
616{
a5766f11 617 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 618
4fca9545
DB		 619 return regulator_print_opmode(buf,
620 rdev->constraints->state_standby.mode);
414c70cb 621}
7ad68e2f
DB		 622static DEVICE_ATTR(suspend_standby_mode, 0444,
623 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 624
625static ssize_t regulator_suspend_mem_state_show(struct device *dev,
626 struct device_attribute *attr, char *buf)
627{
a5766f11 628 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 629
4fca9545
DB		 630 return regulator_print_state(buf,
631 rdev->constraints->state_mem.enabled);
414c70cb 632}
7ad68e2f
DB		 633static DEVICE_ATTR(suspend_mem_state, 0444,
634 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 635
636static ssize_t regulator_suspend_disk_state_show(struct device *dev,
637 struct device_attribute *attr, char *buf)
638{
a5766f11 639 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 640
4fca9545
DB		 641 return regulator_print_state(buf,
642 rdev->constraints->state_disk.enabled);
414c70cb 643}
7ad68e2f
DB		 644static DEVICE_ATTR(suspend_disk_state, 0444,
645 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 646
647static ssize_t regulator_suspend_standby_state_show(struct device *dev,
648 struct device_attribute *attr, char *buf)
649{
a5766f11 650 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 651
4fca9545
DB		 652 return regulator_print_state(buf,
653 rdev->constraints->state_standby.enabled);
414c70cb 654}
7ad68e2f
DB		 655static DEVICE_ATTR(suspend_standby_state, 0444,
656 regulator_suspend_standby_state_show, NULL);
657
f59c8f9f
MB		 658static ssize_t regulator_bypass_show(struct device *dev,
659 struct device_attribute *attr, char *buf)
660{
661 struct regulator_dev *rdev = dev_get_drvdata(dev);
662 const char *report;
663 bool bypass;
664 int ret;
665
666 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
667
668 if (ret != 0)
669 report = "unknown";
670 else if (bypass)
671 report = "enabled";
672 else
673 report = "disabled";
674
675 return sprintf(buf, "%s\n", report);
676}
677static DEVICE_ATTR(bypass, 0444,
678 regulator_bypass_show, NULL);
bc558a60 679
414c70cb
LG		 680/* Calculate the new optimum regulator operating mode based on the new total
681 * consumer load. All locks held by caller */
8460ef38 682static int drms_uA_update(struct regulator_dev *rdev)
414c70cb
LG		 683{
684 struct regulator *sibling;
685 int current_uA = 0, output_uV, input_uV, err;
686 unsigned int mode;
687
70cfef26
KK		 688 lockdep_assert_held_once(&rdev->mutex);
689
8460ef38
BA		 690 /*
691 * first check to see if we can set modes at all, otherwise just
692 * tell the consumer everything is OK.
693 */
414c70cb 694 err = regulator_check_drms(rdev);
8460ef38
BA		 695 if (err < 0)
696 return 0;
697
8f4490e0
BA		 698 if (!rdev->desc->ops->get_optimum_mode &&
699 !rdev->desc->ops->set_load)
8460ef38
BA		 700 return 0;
701
8f4490e0
BA		 702 if (!rdev->desc->ops->set_mode &&
703 !rdev->desc->ops->set_load)
8460ef38 704 return -EINVAL;
414c70cb
LG		 705
706 /* get output voltage */
1bf5a1f8 707 output_uV = _regulator_get_voltage(rdev);
8460ef38
BA		 708 if (output_uV <= 0) {
709 rdev_err(rdev, "invalid output voltage found\n");
710 return -EINVAL;
711 }
414c70cb
LG		 712
713 /* get input voltage */
1bf5a1f8
MB		 714 input_uV = 0;
715 if (rdev->supply)
3f24f5ad 716 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 717 if (input_uV <= 0)
414c70cb 718 input_uV = rdev->constraints->input_uV;
8460ef38
BA		 719 if (input_uV <= 0) {
720 rdev_err(rdev, "invalid input voltage found\n");
721 return -EINVAL;
722 }
414c70cb
LG		 723
724 /* calc total requested load */
725 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 726 current_uA += sibling->uA_load;
414c70cb 727
22a10bca
SB		 728 current_uA += rdev->constraints->system_load;
729
8f4490e0
BA		 730 if (rdev->desc->ops->set_load) {
731 /* set the optimum mode for our new total regulator load */
732 err = rdev->desc->ops->set_load(rdev, current_uA);
733 if (err < 0)
734 rdev_err(rdev, "failed to set load %d\n", current_uA);
735 } else {
736 /* now get the optimum mode for our new total regulator load */
737 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
738 output_uV, current_uA);
739
740 /* check the new mode is allowed */
741 err = regulator_mode_constrain(rdev, &mode);
742 if (err < 0) {
743 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
744 current_uA, input_uV, output_uV);
745 return err;
746 }
414c70cb 747
8f4490e0
BA		 748 err = rdev->desc->ops->set_mode(rdev, mode);
749 if (err < 0)
750 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
8460ef38
BA		 751 }
752
8460ef38 753 return err;
414c70cb
LG		 754}
755
756static int suspend_set_state(struct regulator_dev *rdev,
757 struct regulator_state *rstate)
758{
759 int ret = 0;
638f85c5
MB		 760
761 /* If we have no suspend mode configration don't set anything;
8ac0e95d
AL		 762 * only warn if the driver implements set_suspend_voltage or
763 * set_suspend_mode callback.
638f85c5
MB		 764 */
765 if (!rstate->enabled && !rstate->disabled) {
8ac0e95d
AL		 766 if (rdev->desc->ops->set_suspend_voltage ||
767 rdev->desc->ops->set_suspend_mode)
5da84fd9 768 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 769 return 0;
770 }
771
772 if (rstate->enabled && rstate->disabled) {
5da84fd9 773 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 774 return -EINVAL;
775 }
414c70cb 776
8ac0e95d 777 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
414c70cb 778 ret = rdev->desc->ops->set_suspend_enable(rdev);
8ac0e95d 779 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
414c70cb 780 ret = rdev->desc->ops->set_suspend_disable(rdev);
8ac0e95d
AL		 781 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
782 ret = 0;
783
414c70cb 784 if (ret < 0) {
5da84fd9 785 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 786 return ret;
787 }
788
789 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
790 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
791 if (ret < 0) {
5da84fd9 792 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 793 return ret;
794 }
795 }
796
797 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
798 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
799 if (ret < 0) {
5da84fd9 800 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 801 return ret;
802 }
803 }
804 return ret;
805}
806
807/* locks held by caller */
808static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
809{
70cfef26
KK		 810 lockdep_assert_held_once(&rdev->mutex);
811
414c70cb
LG		 812 if (!rdev->constraints)
813 return -EINVAL;
814
815 switch (state) {
816 case PM_SUSPEND_STANDBY:
817 return suspend_set_state(rdev,
818 &rdev->constraints->state_standby);
819 case PM_SUSPEND_MEM:
820 return suspend_set_state(rdev,
821 &rdev->constraints->state_mem);
822 case PM_SUSPEND_MAX:
823 return suspend_set_state(rdev,
824 &rdev->constraints->state_disk);
825 default:
826 return -EINVAL;
827 }
828}
829
830static void print_constraints(struct regulator_dev *rdev)
831{
832 struct regulation_constraints *constraints = rdev->constraints;
a7068e39 833 char buf[160] = "";
5751a99f 834 size_t len = sizeof(buf) - 1;
8f031b48
MB		 835 int count = 0;
836 int ret;
414c70cb 837
8f031b48 838 if (constraints->min_uV && constraints->max_uV) {
414c70cb 839 if (constraints->min_uV == constraints->max_uV)
5751a99f
SW		 840 count += scnprintf(buf + count, len - count, "%d mV ",
841 constraints->min_uV / 1000);
414c70cb 842 else
5751a99f
SW		 843 count += scnprintf(buf + count, len - count,
844 "%d <--> %d mV ",
845 constraints->min_uV / 1000,
846 constraints->max_uV / 1000);
8f031b48
MB		 847 }
848
849 if (!constraints->min_uV ||
850 constraints->min_uV != constraints->max_uV) {
851 ret = _regulator_get_voltage(rdev);
852 if (ret > 0)
5751a99f
SW		 853 count += scnprintf(buf + count, len - count,
854 "at %d mV ", ret / 1000);
8f031b48
MB		 855 }
856
bf5892a8 857 if (constraints->uV_offset)
5751a99f
SW		 858 count += scnprintf(buf + count, len - count, "%dmV offset ",
859 constraints->uV_offset / 1000);
bf5892a8 860
8f031b48 861 if (constraints->min_uA && constraints->max_uA) {
414c70cb 862 if (constraints->min_uA == constraints->max_uA)
5751a99f
SW		 863 count += scnprintf(buf + count, len - count, "%d mA ",
864 constraints->min_uA / 1000);
414c70cb 865 else
5751a99f
SW		 866 count += scnprintf(buf + count, len - count,
867 "%d <--> %d mA ",
868 constraints->min_uA / 1000,
869 constraints->max_uA / 1000);
8f031b48
MB		 870 }
871
872 if (!constraints->min_uA ||
873 constraints->min_uA != constraints->max_uA) {
874 ret = _regulator_get_current_limit(rdev);
875 if (ret > 0)
5751a99f
SW		 876 count += scnprintf(buf + count, len - count,
877 "at %d mA ", ret / 1000);
414c70cb 878 }
8f031b48 879
414c70cb 880 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
5751a99f 881 count += scnprintf(buf + count, len - count, "fast ");
414c70cb 882 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
5751a99f 883 count += scnprintf(buf + count, len - count, "normal ");
414c70cb 884 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
5751a99f 885 count += scnprintf(buf + count, len - count, "idle ");
414c70cb 886 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
5751a99f 887 count += scnprintf(buf + count, len - count, "standby");
414c70cb 888
215b8b05 889 if (!count)
5751a99f 890 scnprintf(buf, len, "no parameters");
215b8b05 891
194dbaef 892 rdev_dbg(rdev, "%s\n", buf);
4a682922
MB		 893
894 if ((constraints->min_uV != constraints->max_uV) &&
895 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
896 rdev_warn(rdev,
897 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 898}
899
e79055d6 900static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 901 struct regulation_constraints *constraints)
a5766f11 902{
272e2315 903 const struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 904 int ret;
905
906 /* do we need to apply the constraint voltage */
907 if (rdev->constraints->apply_uV &&
75790251 908 rdev->constraints->min_uV == rdev->constraints->max_uV) {
064d5cd1
AB		 909 int current_uV = _regulator_get_voltage(rdev);
910 if (current_uV < 0) {
69d58839
NM		 911 rdev_err(rdev,
912 "failed to get the current voltage(%d)\n",
913 current_uV);
064d5cd1
AB		 914 return current_uV;
915 }
916 if (current_uV < rdev->constraints->min_uV ||
917 current_uV > rdev->constraints->max_uV) {
918 ret = _regulator_do_set_voltage(
919 rdev, rdev->constraints->min_uV,
920 rdev->constraints->max_uV);
921 if (ret < 0) {
922 rdev_err(rdev,
69d58839
NM		 923 "failed to apply %duV constraint(%d)\n",
924 rdev->constraints->min_uV, ret);
064d5cd1
AB		 925 return ret;
926 }
75790251 927 }
af5866c9 928 }
e06f5b4f 929
4367cfdc
DB		 930 /* constrain machine-level voltage specs to fit
931 * the actual range supported by this regulator.
932 */
933 if (ops->list_voltage && rdev->desc->n_voltages) {
934 int count = rdev->desc->n_voltages;
935 int i;
936 int min_uV = INT_MAX;
937 int max_uV = INT_MIN;
938 int cmin = constraints->min_uV;
939 int cmax = constraints->max_uV;
940
3e590918
MB		 941 /* it's safe to autoconfigure fixed-voltage supplies
942 and the constraints are used by list_voltage. */
4367cfdc 943 if (count == 1 && !cmin) {
3e590918 944 cmin = 1;
4367cfdc 945 cmax = INT_MAX;
3e590918
MB		 946 constraints->min_uV = cmin;
947 constraints->max_uV = cmax;
4367cfdc
DB		 948 }
949
3e2b9abd
MB		 950 /* voltage constraints are optional */
951 if ((cmin == 0) && (cmax == 0))
e79055d6 952 return 0;
3e2b9abd 953
4367cfdc 954 /* else require explicit machine-level constraints */
3e2b9abd 955 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 956 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 957 return -EINVAL;
4367cfdc
DB		 958 }
959
960 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
961 for (i = 0; i < count; i++) {
962 int value;
963
964 value = ops->list_voltage(rdev, i);
965 if (value <= 0)
966 continue;
967
968 /* maybe adjust [min_uV..max_uV] */
969 if (value >= cmin && value < min_uV)
970 min_uV = value;
971 if (value <= cmax && value > max_uV)
972 max_uV = value;
973 }
974
975 /* final: [min_uV..max_uV] valid iff constraints valid */
976 if (max_uV < min_uV) {
fff15bef
MB		 977 rdev_err(rdev,
978 "unsupportable voltage constraints %u-%uuV\n",
979 min_uV, max_uV);
e79055d6 980 return -EINVAL;
4367cfdc
DB		 981 }
982
983 /* use regulator's subset of machine constraints */
984 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 985 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
986 constraints->min_uV, min_uV);
4367cfdc
DB		 987 constraints->min_uV = min_uV;
988 }
989 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 990 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
991 constraints->max_uV, max_uV);
4367cfdc
DB		 992 constraints->max_uV = max_uV;
993 }
994 }
995
e79055d6
MB		 996 return 0;
997}
998
f8c1700d
LD		 999static int machine_constraints_current(struct regulator_dev *rdev,
1000 struct regulation_constraints *constraints)
1001{
272e2315 1002 const struct regulator_ops *ops = rdev->desc->ops;
f8c1700d
LD		 1003 int ret;
1004
1005 if (!constraints->min_uA && !constraints->max_uA)
1006 return 0;
1007
1008 if (constraints->min_uA > constraints->max_uA) {
1009 rdev_err(rdev, "Invalid current constraints\n");
1010 return -EINVAL;
1011 }
1012
1013 if (!ops->set_current_limit || !ops->get_current_limit) {
1014 rdev_warn(rdev, "Operation of current configuration missing\n");
1015 return 0;
1016 }
1017
1018 /* Set regulator current in constraints range */
1019 ret = ops->set_current_limit(rdev, constraints->min_uA,
1020 constraints->max_uA);
1021 if (ret < 0) {
1022 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1023 return ret;
1024 }
1025
1026 return 0;
1027}
1028
30c21971
MP		 1029static int _regulator_do_enable(struct regulator_dev *rdev);
1030
e79055d6
MB		 1031/**
1032 * set_machine_constraints - sets regulator constraints
1033 * @rdev: regulator source
1034 * @constraints: constraints to apply
1035 *
1036 * Allows platform initialisation code to define and constrain
1037 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1038 * Constraints *must* be set by platform code in order for some
1039 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1040 * set_mode.
1041 */
1042static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 1043 const struct regulation_constraints *constraints)
e79055d6
MB		 1044{
1045 int ret = 0;
272e2315 1046 const struct regulator_ops *ops = rdev->desc->ops;
e79055d6 1047
9a8f5e07
MB		 1048 if (constraints)
1049 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1050 GFP_KERNEL);
1051 else
1052 rdev->constraints = kzalloc(sizeof(*constraints),
1053 GFP_KERNEL);
f8c12fe3
MB		 1054 if (!rdev->constraints)
1055 return -ENOMEM;
af5866c9 1056
f8c12fe3 1057 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6
MB		 1058 if (ret != 0)
1059 goto out;
1060
f8c1700d 1061 ret = machine_constraints_current(rdev, rdev->constraints);
e79055d6
MB		 1062 if (ret != 0)
1063 goto out;
1064
36e4f839
SB		 1065 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1066 ret = ops->set_input_current_limit(rdev,
1067 rdev->constraints->ilim_uA);
1068 if (ret < 0) {
1069 rdev_err(rdev, "failed to set input limit\n");
1070 goto out;
1071 }
1072 }
1073
a5766f11 1074 /* do we need to setup our suspend state */
9a8f5e07 1075 if (rdev->constraints->initial_state) {
f8c12fe3 1076 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 1077 if (ret < 0) {
5da84fd9 1078 rdev_err(rdev, "failed to set suspend state\n");
e06f5b4f
MB		 1079 goto out;
1080 }
1081 }
a5766f11 1082
9a8f5e07 1083 if (rdev->constraints->initial_mode) {
a308466c 1084 if (!ops->set_mode) {
5da84fd9 1085 rdev_err(rdev, "no set_mode operation\n");
a308466c
MB		 1086 ret = -EINVAL;
1087 goto out;
1088 }
1089
f8c12fe3 1090 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 1091 if (ret < 0) {
5da84fd9 1092 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
a308466c
MB		 1093 goto out;
1094 }
1095 }
1096
cacf90f2
MB		 1097 /* If the constraints say the regulator should be on at this point
1098 * and we have control then make sure it is enabled.
1099 */
30c21971
MP		 1100 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1101 ret = _regulator_do_enable(rdev);
1102 if (ret < 0 && ret != -EINVAL) {
5da84fd9 1103 rdev_err(rdev, "failed to enable\n");
e5fda26c
MB		 1104 goto out;
1105 }
1106 }
1107
1653ccf4
YSB		 1108 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1109 && ops->set_ramp_delay) {
6f0b2c69
YSB		 1110 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1111 if (ret < 0) {
1112 rdev_err(rdev, "failed to set ramp_delay\n");
1113 goto out;
1114 }
1115 }
1116
23c779b9
SB		 1117 if (rdev->constraints->pull_down && ops->set_pull_down) {
1118 ret = ops->set_pull_down(rdev);
1119 if (ret < 0) {
1120 rdev_err(rdev, "failed to set pull down\n");
1121 goto out;
1122 }
1123 }
1124
57f66b78
SB		 1125 if (rdev->constraints->soft_start && ops->set_soft_start) {
1126 ret = ops->set_soft_start(rdev);
1127 if (ret < 0) {
1128 rdev_err(rdev, "failed to set soft start\n");
1129 goto out;
1130 }
1131 }
1132
3a003bae
SB		 1133 if (rdev->constraints->over_current_protection
1134 && ops->set_over_current_protection) {
1135 ret = ops->set_over_current_protection(rdev);
1136 if (ret < 0) {
1137 rdev_err(rdev, "failed to set over current protection\n");
1138 goto out;
1139 }
1140 }
1141
a5766f11 1142 print_constraints(rdev);
1a6958e7 1143 return 0;
a5766f11 1144out:
1a6958e7
AL		 1145 kfree(rdev->constraints);
1146 rdev->constraints = NULL;
a5766f11
LG		 1147 return ret;
1148}
1149
1150/**
1151 * set_supply - set regulator supply regulator
69279fb9
MB		 1152 * @rdev: regulator name
1153 * @supply_rdev: supply regulator name
a5766f11
LG		 1154 *
1155 * Called by platform initialisation code to set the supply regulator for this
1156 * regulator. This ensures that a regulators supply will also be enabled by the
1157 * core if it's child is enabled.
1158 */
1159static int set_supply(struct regulator_dev *rdev,
3801b86a 1160 struct regulator_dev *supply_rdev)
a5766f11
LG		 1161{
1162 int err;
1163
3801b86a
MB		 1164 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1165
e2c09ae7
JMC		 1166 if (!try_module_get(supply_rdev->owner))
1167 return -ENODEV;
1168
3801b86a 1169 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 1170 if (rdev->supply == NULL) {
1171 err = -ENOMEM;
3801b86a 1172 return err;
a5766f11 1173 }
57ad526a 1174 supply_rdev->open_count++;
3801b86a
MB		 1175
1176 return 0;
a5766f11
LG		 1177}
1178
1179/**
06c63f93 1180 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 1181 * @rdev: regulator source
40f9244f 1182 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 1183 * @supply: symbolic name for supply
a5766f11
LG		 1184 *
1185 * Allows platform initialisation code to map physical regulator
1186 * sources to symbolic names for supplies for use by devices. Devices
1187 * should use these symbolic names to request regulators, avoiding the
1188 * need to provide board-specific regulator names as platform data.
1189 */
1190static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 1191 const char *consumer_dev_name,
1192 const char *supply)
a5766f11
LG		 1193{
1194 struct regulator_map *node;
9ed2099e 1195 int has_dev;
a5766f11
LG		 1196
1197 if (supply == NULL)
1198 return -EINVAL;
1199
9ed2099e
MB		 1200 if (consumer_dev_name != NULL)
1201 has_dev = 1;
1202 else
1203 has_dev = 0;
1204
6001e13c 1205 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1206 if (node->dev_name && consumer_dev_name) {
1207 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1208 continue;
1209 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1210 continue;
23b5cc2a
JN		 1211 }
1212
6001e13c
DB		 1213 if (strcmp(node->supply, supply) != 0)
1214 continue;
1215
737f360d
MB		 1216 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1217 consumer_dev_name,
1218 dev_name(&node->regulator->dev),
1219 node->regulator->desc->name,
1220 supply,
1221 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 1222 return -EBUSY;
1223 }
1224
9ed2099e 1225 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 1226 if (node == NULL)
1227 return -ENOMEM;
1228
1229 node->regulator = rdev;
a5766f11
LG		 1230 node->supply = supply;
1231
9ed2099e
MB		 1232 if (has_dev) {
1233 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1234 if (node->dev_name == NULL) {
1235 kfree(node);
1236 return -ENOMEM;
1237 }
40f9244f
MB		 1238 }
1239
a5766f11
LG		 1240 list_add(&node->list, &regulator_map_list);
1241 return 0;
1242}
1243
0f1d747b
MR		 1244static void unset_regulator_supplies(struct regulator_dev *rdev)
1245{
1246 struct regulator_map *node, *n;
1247
1248 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1249 if (rdev == node->regulator) {
1250 list_del(&node->list);
40f9244f 1251 kfree(node->dev_name);
0f1d747b 1252 kfree(node);
0f1d747b
MR		 1253 }
1254 }
1255}
1256
f5726ae3 1257#define REG_STR_SIZE 64
414c70cb
LG		 1258
1259static struct regulator *create_regulator(struct regulator_dev *rdev,
1260 struct device *dev,
1261 const char *supply_name)
1262{
1263 struct regulator *regulator;
1264 char buf[REG_STR_SIZE];
1265 int err, size;
1266
1267 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1268 if (regulator == NULL)
1269 return NULL;
1270
1271 mutex_lock(&rdev->mutex);
1272 regulator->rdev = rdev;
1273 list_add(&regulator->list, &rdev->consumer_list);
1274
1275 if (dev) {
e2c98eaf
SG		 1276 regulator->dev = dev;
1277
222cc7b1 1278 /* Add a link to the device sysfs entry */
414c70cb
LG		 1279 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1280 dev->kobj.name, supply_name);
1281 if (size >= REG_STR_SIZE)
222cc7b1 1282 goto overflow_err;
414c70cb
LG		 1283
1284 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1285 if (regulator->supply_name == NULL)
222cc7b1 1286 goto overflow_err;
414c70cb 1287
ff268b56 1288 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
414c70cb
LG		 1289 buf);
1290 if (err) {
ff268b56 1291 rdev_dbg(rdev, "could not add device link %s err %d\n",
5da84fd9 1292 dev->kobj.name, err);
222cc7b1 1293 /* non-fatal */
414c70cb 1294 }
5de70519
MB		 1295 } else {
1296 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1297 if (regulator->supply_name == NULL)
222cc7b1 1298 goto overflow_err;
5de70519
MB		 1299 }
1300
5de70519
MB		 1301 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1302 rdev->debugfs);
24751434 1303 if (!regulator->debugfs) {
ad3a942b 1304 rdev_dbg(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1305 } else {
1306 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1307 &regulator->uA_load);
1308 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1309 &regulator->min_uV);
1310 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1311 &regulator->max_uV);
414c70cb 1312 }
5de70519 1313
6492bc1b
MB		 1314 /*
1315 * Check now if the regulator is an always on regulator - if
1316 * it is then we don't need to do nearly so much work for
1317 * enable/disable calls.
1318 */
1319 if (!_regulator_can_change_status(rdev) &&
1320 _regulator_is_enabled(rdev))
1321 regulator->always_on = true;
1322
414c70cb
LG		 1323 mutex_unlock(&rdev->mutex);
1324 return regulator;
414c70cb
LG		 1325overflow_err:
1326 list_del(&regulator->list);
1327 kfree(regulator);
1328 mutex_unlock(&rdev->mutex);
1329 return NULL;
1330}
1331
31aae2be
MB		 1332static int _regulator_get_enable_time(struct regulator_dev *rdev)
1333{
00c877c6
LD		 1334 if (rdev->constraints && rdev->constraints->enable_time)
1335 return rdev->constraints->enable_time;
31aae2be 1336 if (!rdev->desc->ops->enable_time)
79511ed3 1337 return rdev->desc->enable_time;
31aae2be
MB		 1338 return rdev->desc->ops->enable_time(rdev);
1339}
1340
a06ccd9c
CK		 1341static struct regulator_supply_alias *regulator_find_supply_alias(
1342 struct device *dev, const char *supply)
1343{
1344 struct regulator_supply_alias *map;
1345
1346 list_for_each_entry(map, &regulator_supply_alias_list, list)
1347 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1348 return map;
1349
1350 return NULL;
1351}
1352
1353static void regulator_supply_alias(struct device **dev, const char **supply)
1354{
1355 struct regulator_supply_alias *map;
1356
1357 map = regulator_find_supply_alias(*dev, *supply);
1358 if (map) {
1359 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1360 *supply, map->alias_supply,
1361 dev_name(map->alias_dev));
1362 *dev = map->alias_dev;
1363 *supply = map->alias_supply;
1364 }
1365}
1366
69511a45 1367static struct regulator_dev *regulator_dev_lookup(struct device *dev,
6d191a5f
MB		 1368 const char *supply,
1369 int *ret)
69511a45
RN		 1370{
1371 struct regulator_dev *r;
1372 struct device_node *node;
576ca436
MB		 1373 struct regulator_map *map;
1374 const char *devname = NULL;
69511a45 1375
a06ccd9c
CK		 1376 regulator_supply_alias(&dev, &supply);
1377
69511a45
RN		 1378 /* first do a dt based lookup */
1379 if (dev && dev->of_node) {
1380 node = of_get_regulator(dev, supply);
6d191a5f 1381 if (node) {
69511a45
RN		 1382 list_for_each_entry(r, &regulator_list, list)
1383 if (r->dev.parent &&
1384 node == r->dev.of_node)
1385 return r;
317b5684
MB		 1386 *ret = -EPROBE_DEFER;
1387 return NULL;
6d191a5f
MB		 1388 } else {
1389 /*
1390 * If we couldn't even get the node then it's
1391 * not just that the device didn't register
1392 * yet, there's no node and we'll never
1393 * succeed.
1394 */
1395 *ret = -ENODEV;
1396 }
69511a45
RN		 1397 }
1398
1399 /* if not found, try doing it non-dt way */
576ca436
MB		 1400 if (dev)
1401 devname = dev_name(dev);
1402
69511a45
RN		 1403 list_for_each_entry(r, &regulator_list, list)
1404 if (strcmp(rdev_get_name(r), supply) == 0)
1405 return r;
1406
576ca436
MB		 1407 list_for_each_entry(map, &regulator_map_list, list) {
1408 /* If the mapping has a device set up it must match */
1409 if (map->dev_name &&
1410 (!devname || strcmp(map->dev_name, devname)))
1411 continue;
1412
1413 if (strcmp(map->supply, supply) == 0)
1414 return map->regulator;
1415 }
1416
1417
69511a45
RN		 1418 return NULL;
1419}
1420
6261b06d
BA		 1421static int regulator_resolve_supply(struct regulator_dev *rdev)
1422{
1423 struct regulator_dev *r;
1424 struct device *dev = rdev->dev.parent;
1425 int ret;
1426
1427 /* No supply to resovle? */
1428 if (!rdev->supply_name)
1429 return 0;
1430
1431 /* Supply already resolved? */
1432 if (rdev->supply)
1433 return 0;
1434
1435 r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
1436 if (ret == -ENODEV) {
1437 /*
1438 * No supply was specified for this regulator and
1439 * there will never be one.
1440 */
1441 return 0;
1442 }
1443
1444 if (!r) {
9f7e25ed
MB		 1445 if (have_full_constraints()) {
1446 r = dummy_regulator_rdev;
1447 } else {
1448 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1449 rdev->supply_name, rdev->desc->name);
1450 return -EPROBE_DEFER;
1451 }
6261b06d
BA		 1452 }
1453
1454 /* Recursively resolve the supply of the supply */
1455 ret = regulator_resolve_supply(r);
1456 if (ret < 0)
1457 return ret;
1458
1459 ret = set_supply(rdev, r);
1460 if (ret < 0)
1461 return ret;
1462
1463 /* Cascade always-on state to supply */
1464 if (_regulator_is_enabled(rdev)) {
1465 ret = regulator_enable(rdev->supply);
36a1f1b6
JMC		 1466 if (ret < 0) {
1467 if (rdev->supply)
1468 _regulator_put(rdev->supply);
6261b06d 1469 return ret;
36a1f1b6 1470 }
6261b06d
BA		 1471 }
1472
1473 return 0;
1474}
1475
5ffbd136
MB		 1476/* Internal regulator request function */
1477static struct regulator *_regulator_get(struct device *dev, const char *id,
4ddfebd3 1478 bool exclusive, bool allow_dummy)
414c70cb
LG		 1479{
1480 struct regulator_dev *rdev;
04bf3011 1481 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
40f9244f 1482 const char *devname = NULL;
317b5684 1483 int ret;
414c70cb
LG		 1484
1485 if (id == NULL) {
5da84fd9 1486 pr_err("get() with no identifier\n");
043c998f 1487 return ERR_PTR(-EINVAL);
414c70cb
LG		 1488 }
1489
40f9244f
MB		 1490 if (dev)
1491 devname = dev_name(dev);
1492
317b5684
MB		 1493 if (have_full_constraints())
1494 ret = -ENODEV;
1495 else
1496 ret = -EPROBE_DEFER;
1497
414c70cb
LG		 1498 mutex_lock(&regulator_list_mutex);
1499
6d191a5f 1500 rdev = regulator_dev_lookup(dev, id, &ret);
69511a45
RN		 1501 if (rdev)
1502 goto found;
1503
ef60abbb
MB		 1504 regulator = ERR_PTR(ret);
1505
1e4b545c
NM		 1506 /*
1507 * If we have return value from dev_lookup fail, we do not expect to
1508 * succeed, so, quit with appropriate error value
1509 */
0d25d09d 1510 if (ret && ret != -ENODEV)
1e4b545c 1511 goto out;
1e4b545c 1512
34abbd68
MB		 1513 if (!devname)
1514 devname = "deviceless";
1515
4ddfebd3
MB		 1516 /*
1517 * Assume that a regulator is physically present and enabled
1518 * even if it isn't hooked up and just provide a dummy.
34abbd68 1519 */
87b28417 1520 if (have_full_constraints() && allow_dummy) {
5da84fd9
JP		 1521 pr_warn("%s supply %s not found, using dummy regulator\n",
1522 devname, id);
4ddfebd3 1523
34abbd68
MB		 1524 rdev = dummy_regulator_rdev;
1525 goto found;
0781719b
HG		 1526 /* Don't log an error when called from regulator_get_optional() */
1527 } else if (!have_full_constraints() || exclusive) {
acc3d5ce 1528 dev_warn(dev, "dummy supplies not allowed\n");
34abbd68 1529 }
34abbd68 1530
414c70cb
LG		 1531 mutex_unlock(&regulator_list_mutex);
1532 return regulator;
1533
1534found:
5ffbd136
MB		 1535 if (rdev->exclusive) {
1536 regulator = ERR_PTR(-EPERM);
1537 goto out;
1538 }
1539
1540 if (exclusive && rdev->open_count) {
1541 regulator = ERR_PTR(-EBUSY);
1542 goto out;
1543 }
1544
6261b06d
BA		 1545 ret = regulator_resolve_supply(rdev);
1546 if (ret < 0) {
1547 regulator = ERR_PTR(ret);
1548 goto out;
1549 }
1550
a5766f11
LG		 1551 if (!try_module_get(rdev->owner))
1552 goto out;
1553
414c70cb
LG		 1554 regulator = create_regulator(rdev, dev, id);
1555 if (regulator == NULL) {
1556 regulator = ERR_PTR(-ENOMEM);
1557 module_put(rdev->owner);
bcda4321 1558 goto out;
414c70cb
LG		 1559 }
1560
5ffbd136
MB		 1561 rdev->open_count++;
1562 if (exclusive) {
1563 rdev->exclusive = 1;
1564
1565 ret = _regulator_is_enabled(rdev);
1566 if (ret > 0)
1567 rdev->use_count = 1;
1568 else
1569 rdev->use_count = 0;
1570 }
1571
a5766f11 1572out:
414c70cb 1573 mutex_unlock(&regulator_list_mutex);
5ffbd136 1574
414c70cb
LG		 1575 return regulator;
1576}
5ffbd136
MB		 1577
1578/**
1579 * regulator_get - lookup and obtain a reference to a regulator.
1580 * @dev: device for regulator "consumer"
1581 * @id: Supply name or regulator ID.
1582 *
1583 * Returns a struct regulator corresponding to the regulator producer,
1584 * or IS_ERR() condition containing errno.
1585 *
1586 * Use of supply names configured via regulator_set_device_supply() is
1587 * strongly encouraged. It is recommended that the supply name used
1588 * should match the name used for the supply and/or the relevant
1589 * device pins in the datasheet.
1590 */
1591struct regulator *regulator_get(struct device *dev, const char *id)
1592{
4ddfebd3 1593 return _regulator_get(dev, id, false, true);
5ffbd136 1594}
414c70cb
LG		 1595EXPORT_SYMBOL_GPL(regulator_get);
1596
5ffbd136
MB		 1597/**
1598 * regulator_get_exclusive - obtain exclusive access to a regulator.
1599 * @dev: device for regulator "consumer"
1600 * @id: Supply name or regulator ID.
1601 *
1602 * Returns a struct regulator corresponding to the regulator producer,
1603 * or IS_ERR() condition containing errno. Other consumers will be
69c3f723
SB		 1604 * unable to obtain this regulator while this reference is held and the
1605 * use count for the regulator will be initialised to reflect the current
1606 * state of the regulator.
5ffbd136
MB		 1607 *
1608 * This is intended for use by consumers which cannot tolerate shared
1609 * use of the regulator such as those which need to force the
1610 * regulator off for correct operation of the hardware they are
1611 * controlling.
1612 *
1613 * Use of supply names configured via regulator_set_device_supply() is
1614 * strongly encouraged. It is recommended that the supply name used
1615 * should match the name used for the supply and/or the relevant
1616 * device pins in the datasheet.
1617 */
1618struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1619{
4ddfebd3 1620 return _regulator_get(dev, id, true, false);
5ffbd136
MB		 1621}
1622EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1623
de1dd9fd
MB		 1624/**
1625 * regulator_get_optional - obtain optional access to a regulator.
1626 * @dev: device for regulator "consumer"
1627 * @id: Supply name or regulator ID.
1628 *
1629 * Returns a struct regulator corresponding to the regulator producer,
69c3f723 1630 * or IS_ERR() condition containing errno.
de1dd9fd
MB		 1631 *
1632 * This is intended for use by consumers for devices which can have
1633 * some supplies unconnected in normal use, such as some MMC devices.
1634 * It can allow the regulator core to provide stub supplies for other
1635 * supplies requested using normal regulator_get() calls without
1636 * disrupting the operation of drivers that can handle absent
1637 * supplies.
1638 *
1639 * Use of supply names configured via regulator_set_device_supply() is
1640 * strongly encouraged. It is recommended that the supply name used
1641 * should match the name used for the supply and/or the relevant
1642 * device pins in the datasheet.
1643 */
1644struct regulator *regulator_get_optional(struct device *dev, const char *id)
1645{
4ddfebd3 1646 return _regulator_get(dev, id, false, false);
de1dd9fd
MB		 1647}
1648EXPORT_SYMBOL_GPL(regulator_get_optional);
1649
83b0302d 1650/* regulator_list_mutex lock held by regulator_put() */
23ff2f0f 1651static void _regulator_put(struct regulator *regulator)
414c70cb
LG		 1652{
1653 struct regulator_dev *rdev;
1654
93576842 1655 if (IS_ERR_OR_NULL(regulator))
414c70cb
LG		 1656 return;
1657
70cfef26
KK		 1658 lockdep_assert_held_once(&regulator_list_mutex);
1659
414c70cb
LG		 1660 rdev = regulator->rdev;
1661
5de70519 1662 debugfs_remove_recursive(regulator->debugfs);
5de70519 1663
414c70cb 1664 /* remove any sysfs entries */
e2c98eaf 1665 if (regulator->dev)
414c70cb 1666 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
83b0302d 1667 mutex_lock(&rdev->mutex);
414c70cb 1668 list_del(&regulator->list);
414c70cb 1669
5ffbd136
MB		 1670 rdev->open_count--;
1671 rdev->exclusive = 0;
83b0302d 1672 mutex_unlock(&rdev->mutex);
5ffbd136 1673
1768514e
MB		 1674 kfree(regulator->supply_name);
1675 kfree(regulator);
1676
414c70cb 1677 module_put(rdev->owner);
23ff2f0f
CK		 1678}
1679
1680/**
1681 * regulator_put - "free" the regulator source
1682 * @regulator: regulator source
1683 *
1684 * Note: drivers must ensure that all regulator_enable calls made on this
1685 * regulator source are balanced by regulator_disable calls prior to calling
1686 * this function.
1687 */
1688void regulator_put(struct regulator *regulator)
1689{
1690 mutex_lock(&regulator_list_mutex);
1691 _regulator_put(regulator);
414c70cb
LG		 1692 mutex_unlock(&regulator_list_mutex);
1693}
1694EXPORT_SYMBOL_GPL(regulator_put);
1695
a06ccd9c
CK		 1696/**
1697 * regulator_register_supply_alias - Provide device alias for supply lookup
1698 *
1699 * @dev: device that will be given as the regulator "consumer"
1700 * @id: Supply name or regulator ID
1701 * @alias_dev: device that should be used to lookup the supply
1702 * @alias_id: Supply name or regulator ID that should be used to lookup the
1703 * supply
1704 *
1705 * All lookups for id on dev will instead be conducted for alias_id on
1706 * alias_dev.
1707 */
1708int regulator_register_supply_alias(struct device *dev, const char *id,
1709 struct device *alias_dev,
1710 const char *alias_id)
1711{
1712 struct regulator_supply_alias *map;
1713
1714 map = regulator_find_supply_alias(dev, id);
1715 if (map)
1716 return -EEXIST;
1717
1718 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1719 if (!map)
1720 return -ENOMEM;
1721
1722 map->src_dev = dev;
1723 map->src_supply = id;
1724 map->alias_dev = alias_dev;
1725 map->alias_supply = alias_id;
1726
1727 list_add(&map->list, &regulator_supply_alias_list);
1728
1729 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1730 id, dev_name(dev), alias_id, dev_name(alias_dev));
1731
1732 return 0;
1733}
1734EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1735
1736/**
1737 * regulator_unregister_supply_alias - Remove device alias
1738 *
1739 * @dev: device that will be given as the regulator "consumer"
1740 * @id: Supply name or regulator ID
1741 *
1742 * Remove a lookup alias if one exists for id on dev.
1743 */
1744void regulator_unregister_supply_alias(struct device *dev, const char *id)
1745{
1746 struct regulator_supply_alias *map;
1747
1748 map = regulator_find_supply_alias(dev, id);
1749 if (map) {
1750 list_del(&map->list);
1751 kfree(map);
1752 }
1753}
1754EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1755
1756/**
1757 * regulator_bulk_register_supply_alias - register multiple aliases
1758 *
1759 * @dev: device that will be given as the regulator "consumer"
1760 * @id: List of supply names or regulator IDs
1761 * @alias_dev: device that should be used to lookup the supply
1762 * @alias_id: List of supply names or regulator IDs that should be used to
1763 * lookup the supply
1764 * @num_id: Number of aliases to register
1765 *
1766 * @return 0 on success, an errno on failure.
1767 *
1768 * This helper function allows drivers to register several supply
1769 * aliases in one operation. If any of the aliases cannot be
1770 * registered any aliases that were registered will be removed
1771 * before returning to the caller.
1772 */
9f8c0fe9
LJ		 1773int regulator_bulk_register_supply_alias(struct device *dev,
1774 const char *const *id,
a06ccd9c 1775 struct device *alias_dev,
9f8c0fe9 1776 const char *const *alias_id,
a06ccd9c
CK		 1777 int num_id)
1778{
1779 int i;
1780 int ret;
1781
1782 for (i = 0; i < num_id; ++i) {
1783 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1784 alias_id[i]);
1785 if (ret < 0)
1786 goto err;
1787 }
1788
1789 return 0;
1790
1791err:
1792 dev_err(dev,
1793 "Failed to create supply alias %s,%s -> %s,%s\n",
1794 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1795
1796 while (--i >= 0)
1797 regulator_unregister_supply_alias(dev, id[i]);
1798
1799 return ret;
1800}
1801EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1802
1803/**
1804 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1805 *
1806 * @dev: device that will be given as the regulator "consumer"
1807 * @id: List of supply names or regulator IDs
1808 * @num_id: Number of aliases to unregister
1809 *
1810 * This helper function allows drivers to unregister several supply
1811 * aliases in one operation.
1812 */
1813void regulator_bulk_unregister_supply_alias(struct device *dev,
9f8c0fe9 1814 const char *const *id,
a06ccd9c
CK		 1815 int num_id)
1816{
1817 int i;
1818
1819 for (i = 0; i < num_id; ++i)
1820 regulator_unregister_supply_alias(dev, id[i]);
1821}
1822EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1823
1824
f19b00da
KM		 1825/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1826static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1827 const struct regulator_config *config)
1828{
1829 struct regulator_enable_gpio *pin;
778b28b4 1830 struct gpio_desc *gpiod;
f19b00da
KM		 1831 int ret;
1832
778b28b4
RK		 1833 gpiod = gpio_to_desc(config->ena_gpio);
1834
f19b00da 1835 list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
778b28b4 1836 if (pin->gpiod == gpiod) {
f19b00da
KM		 1837 rdev_dbg(rdev, "GPIO %d is already used\n",
1838 config->ena_gpio);
1839 goto update_ena_gpio_to_rdev;
1840 }
1841 }
1842
1843 ret = gpio_request_one(config->ena_gpio,
1844 GPIOF_DIR_OUT | config->ena_gpio_flags,
1845 rdev_get_name(rdev));
1846 if (ret)
1847 return ret;
1848
1849 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1850 if (pin == NULL) {
1851 gpio_free(config->ena_gpio);
1852 return -ENOMEM;
1853 }
1854
778b28b4 1855 pin->gpiod = gpiod;
f19b00da
KM		 1856 pin->ena_gpio_invert = config->ena_gpio_invert;
1857 list_add(&pin->list, &regulator_ena_gpio_list);
1858
1859update_ena_gpio_to_rdev:
1860 pin->request_count++;
1861 rdev->ena_pin = pin;
1862 return 0;
1863}
1864
1865static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1866{
1867 struct regulator_enable_gpio *pin, *n;
1868
1869 if (!rdev->ena_pin)
1870 return;
1871
1872 /* Free the GPIO only in case of no use */
1873 list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
778b28b4 1874 if (pin->gpiod == rdev->ena_pin->gpiod) {
f19b00da
KM		 1875 if (pin->request_count <= 1) {
1876 pin->request_count = 0;
778b28b4 1877 gpiod_put(pin->gpiod);
f19b00da
KM		 1878 list_del(&pin->list);
1879 kfree(pin);
60a2362f
SWK		 1880 rdev->ena_pin = NULL;
1881 return;
f19b00da
KM		 1882 } else {
1883 pin->request_count--;
1884 }
1885 }
1886 }
1887}
1888
967cfb18 1889/**
31d6eebf
RD		 1890 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1891 * @rdev: regulator_dev structure
1892 * @enable: enable GPIO at initial use?
1893 *
967cfb18
KM		 1894 * GPIO is enabled in case of initial use. (enable_count is 0)
1895 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1896 */
1897static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1898{
1899 struct regulator_enable_gpio *pin = rdev->ena_pin;
1900
1901 if (!pin)
1902 return -EINVAL;
1903
1904 if (enable) {
1905 /* Enable GPIO at initial use */
1906 if (pin->enable_count == 0)
778b28b4
RK		 1907 gpiod_set_value_cansleep(pin->gpiod,
1908 !pin->ena_gpio_invert);
967cfb18
KM		 1909
1910 pin->enable_count++;
1911 } else {
1912 if (pin->enable_count > 1) {
1913 pin->enable_count--;
1914 return 0;
1915 }
1916
1917 /* Disable GPIO if not used */
1918 if (pin->enable_count <= 1) {
778b28b4
RK		 1919 gpiod_set_value_cansleep(pin->gpiod,
1920 pin->ena_gpio_invert);
967cfb18
KM		 1921 pin->enable_count = 0;
1922 }
1923 }
1924
1925 return 0;
1926}
1927
79fd1141
GX		 1928/**
1929 * _regulator_enable_delay - a delay helper function
1930 * @delay: time to delay in microseconds
1931 *
1932 * Delay for the requested amount of time as per the guidelines in:
1933 *
1934 * Documentation/timers/timers-howto.txt
1935 *
1936 * The assumption here is that regulators will never be enabled in
1937 * atomic context and therefore sleeping functions can be used.
1938 */
1939static void _regulator_enable_delay(unsigned int delay)
1940{
1941 unsigned int ms = delay / 1000;
1942 unsigned int us = delay % 1000;
1943
1944 if (ms > 0) {
1945 /*
1946 * For small enough values, handle super-millisecond
1947 * delays in the usleep_range() call below.
1948 */
1949 if (ms < 20)
1950 us += ms * 1000;
1951 else
1952 msleep(ms);
1953 }
1954
1955 /*
1956 * Give the scheduler some room to coalesce with any other
1957 * wakeup sources. For delays shorter than 10 us, don't even
1958 * bother setting up high-resolution timers and just busy-
1959 * loop.
1960 */
1961 if (us >= 10)
1962 usleep_range(us, us + 100);
1963 else
1964 udelay(us);
1965}
1966
5c5659d0
MB		 1967static int _regulator_do_enable(struct regulator_dev *rdev)
1968{
1969 int ret, delay;
1970
1971 /* Query before enabling in case configuration dependent. */
1972 ret = _regulator_get_enable_time(rdev);
1973 if (ret >= 0) {
1974 delay = ret;
1975 } else {
1976 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1977 delay = 0;
1978 }
1979
1980 trace_regulator_enable(rdev_get_name(rdev));
1981
871f5650
GX		 1982 if (rdev->desc->off_on_delay) {
1983 /* if needed, keep a distance of off_on_delay from last time
1984 * this regulator was disabled.
1985 */
1986 unsigned long start_jiffy = jiffies;
1987 unsigned long intended, max_delay, remaining;
1988
1989 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
1990 intended = rdev->last_off_jiffy + max_delay;
1991
1992 if (time_before(start_jiffy, intended)) {
1993 /* calc remaining jiffies to deal with one-time
1994 * timer wrapping.
1995 * in case of multiple timer wrapping, either it can be
1996 * detected by out-of-range remaining, or it cannot be
1997 * detected and we gets a panelty of
1998 * _regulator_enable_delay().
1999 */
2000 remaining = intended - start_jiffy;
2001 if (remaining <= max_delay)
2002 _regulator_enable_delay(
2003 jiffies_to_usecs(remaining));
2004 }
2005 }
2006
967cfb18 2007 if (rdev->ena_pin) {
29d62ec5
DA		 2008 if (!rdev->ena_gpio_state) {
2009 ret = regulator_ena_gpio_ctrl(rdev, true);
2010 if (ret < 0)
2011 return ret;
2012 rdev->ena_gpio_state = 1;
2013 }
65f73508 2014 } else if (rdev->desc->ops->enable) {
5c5659d0
MB		 2015 ret = rdev->desc->ops->enable(rdev);
2016 if (ret < 0)
2017 return ret;
2018 } else {
2019 return -EINVAL;
2020 }
2021
2022 /* Allow the regulator to ramp; it would be useful to extend
2023 * this for bulk operations so that the regulators can ramp
2024 * together. */
2025 trace_regulator_enable_delay(rdev_get_name(rdev));
2026
79fd1141 2027 _regulator_enable_delay(delay);
5c5659d0
MB		 2028
2029 trace_regulator_enable_complete(rdev_get_name(rdev));
2030
2031 return 0;
2032}
2033
414c70cb
LG		 2034/* locks held by regulator_enable() */
2035static int _regulator_enable(struct regulator_dev *rdev)
2036{
5c5659d0 2037 int ret;
414c70cb 2038
70cfef26
KK		 2039 lockdep_assert_held_once(&rdev->mutex);
2040
414c70cb 2041 /* check voltage and requested load before enabling */
9a2372fa
MB		 2042 if (rdev->constraints &&
2043 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
2044 drms_uA_update(rdev);
414c70cb 2045
9a2372fa
MB		 2046 if (rdev->use_count == 0) {
2047 /* The regulator may on if it's not switchable or left on */
2048 ret = _regulator_is_enabled(rdev);
2049 if (ret == -EINVAL || ret == 0) {
2050 if (!_regulator_can_change_status(rdev))
2051 return -EPERM;
2052
5c5659d0 2053 ret = _regulator_do_enable(rdev);
31aae2be
MB		 2054 if (ret < 0)
2055 return ret;
2056
a7433cff 2057 } else if (ret < 0) {
5da84fd9 2058 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 2059 return ret;
2060 }
a7433cff 2061 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 2062 }
2063
9a2372fa
MB		 2064 rdev->use_count++;
2065
2066 return 0;
414c70cb
LG		 2067}
2068
2069/**
2070 * regulator_enable - enable regulator output
2071 * @regulator: regulator source
2072 *
cf7bbcdf
MB		 2073 * Request that the regulator be enabled with the regulator output at
2074 * the predefined voltage or current value. Calls to regulator_enable()
2075 * must be balanced with calls to regulator_disable().
2076 *
414c70cb 2077 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 2078 * hardwired in the regulator.
414c70cb
LG		 2079 */
2080int regulator_enable(struct regulator *regulator)
2081{
412aec61
DB		 2082 struct regulator_dev *rdev = regulator->rdev;
2083 int ret = 0;
414c70cb 2084
6492bc1b
MB		 2085 if (regulator->always_on)
2086 return 0;
2087
3801b86a
MB		 2088 if (rdev->supply) {
2089 ret = regulator_enable(rdev->supply);
2090 if (ret != 0)
2091 return ret;
2092 }
2093
412aec61 2094 mutex_lock(&rdev->mutex);
cd94b505 2095 ret = _regulator_enable(rdev);
412aec61 2096 mutex_unlock(&rdev->mutex);
3801b86a 2097
d1685e4e 2098 if (ret != 0 && rdev->supply)
3801b86a
MB		 2099 regulator_disable(rdev->supply);
2100
414c70cb
LG		 2101 return ret;
2102}
2103EXPORT_SYMBOL_GPL(regulator_enable);
2104
5c5659d0
MB		 2105static int _regulator_do_disable(struct regulator_dev *rdev)
2106{
2107 int ret;
2108
2109 trace_regulator_disable(rdev_get_name(rdev));
2110
967cfb18 2111 if (rdev->ena_pin) {
29d62ec5
DA		 2112 if (rdev->ena_gpio_state) {
2113 ret = regulator_ena_gpio_ctrl(rdev, false);
2114 if (ret < 0)
2115 return ret;
2116 rdev->ena_gpio_state = 0;
2117 }
5c5659d0
MB		 2118
2119 } else if (rdev->desc->ops->disable) {
2120 ret = rdev->desc->ops->disable(rdev);
2121 if (ret != 0)
2122 return ret;
2123 }
2124
871f5650
GX		 2125 /* cares about last_off_jiffy only if off_on_delay is required by
2126 * device.
2127 */
2128 if (rdev->desc->off_on_delay)
2129 rdev->last_off_jiffy = jiffies;
2130
5c5659d0
MB		 2131 trace_regulator_disable_complete(rdev_get_name(rdev));
2132
5c5659d0
MB		 2133 return 0;
2134}
2135
414c70cb 2136/* locks held by regulator_disable() */
3801b86a 2137static int _regulator_disable(struct regulator_dev *rdev)
414c70cb
LG		 2138{
2139 int ret = 0;
2140
70cfef26
KK		 2141 lockdep_assert_held_once(&rdev->mutex);
2142
cd94b505 2143 if (WARN(rdev->use_count <= 0,
43e7ee33 2144 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 2145 return -EIO;
2146
414c70cb 2147 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 2148 if (rdev->use_count == 1 &&
2149 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 2150
2151 /* we are last user */
5c5659d0 2152 if (_regulator_can_change_status(rdev)) {
a1c8a551
RF		 2153 ret = _notifier_call_chain(rdev,
2154 REGULATOR_EVENT_PRE_DISABLE,
2155 NULL);
2156 if (ret & NOTIFY_STOP_MASK)
2157 return -EINVAL;
2158
5c5659d0 2159 ret = _regulator_do_disable(rdev);
414c70cb 2160 if (ret < 0) {
5da84fd9 2161 rdev_err(rdev, "failed to disable\n");
a1c8a551
RF		 2162 _notifier_call_chain(rdev,
2163 REGULATOR_EVENT_ABORT_DISABLE,
2164 NULL);
414c70cb
LG		 2165 return ret;
2166 }
66fda75f
MP		 2167 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2168 NULL);
414c70cb
LG		 2169 }
2170
414c70cb
LG		 2171 rdev->use_count = 0;
2172 } else if (rdev->use_count > 1) {
2173
2174 if (rdev->constraints &&
2175 (rdev->constraints->valid_ops_mask &
2176 REGULATOR_CHANGE_DRMS))
2177 drms_uA_update(rdev);
2178
2179 rdev->use_count--;
2180 }
3801b86a 2181
414c70cb
LG		 2182 return ret;
2183}
2184
2185/**
2186 * regulator_disable - disable regulator output
2187 * @regulator: regulator source
2188 *
cf7bbcdf
MB		 2189 * Disable the regulator output voltage or current. Calls to
2190 * regulator_enable() must be balanced with calls to
2191 * regulator_disable().
69279fb9 2192 *
414c70cb 2193 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 2194 * devices have it enabled, the regulator device supports disabling and
2195 * machine constraints permit this operation.
414c70cb
LG		 2196 */
2197int regulator_disable(struct regulator *regulator)
2198{
412aec61
DB		 2199 struct regulator_dev *rdev = regulator->rdev;
2200 int ret = 0;
414c70cb 2201
6492bc1b
MB		 2202 if (regulator->always_on)
2203 return 0;
2204
412aec61 2205 mutex_lock(&rdev->mutex);
3801b86a 2206 ret = _regulator_disable(rdev);
412aec61 2207 mutex_unlock(&rdev->mutex);
8cbf811d 2208
3801b86a
MB		 2209 if (ret == 0 && rdev->supply)
2210 regulator_disable(rdev->supply);
8cbf811d 2211
414c70cb
LG		 2212 return ret;
2213}
2214EXPORT_SYMBOL_GPL(regulator_disable);
2215
2216/* locks held by regulator_force_disable() */
3801b86a 2217static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 2218{
2219 int ret = 0;
2220
70cfef26
KK		 2221 lockdep_assert_held_once(&rdev->mutex);
2222
a1c8a551
RF		 2223 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2224 REGULATOR_EVENT_PRE_DISABLE, NULL);
2225 if (ret & NOTIFY_STOP_MASK)
2226 return -EINVAL;
2227
66fda75f
MP		 2228 ret = _regulator_do_disable(rdev);
2229 if (ret < 0) {
2230 rdev_err(rdev, "failed to force disable\n");
a1c8a551
RF		 2231 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2232 REGULATOR_EVENT_ABORT_DISABLE, NULL);
66fda75f 2233 return ret;
414c70cb
LG		 2234 }
2235
66fda75f
MP		 2236 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2237 REGULATOR_EVENT_DISABLE, NULL);
2238
2239 return 0;
414c70cb
LG		 2240}
2241
2242/**
2243 * regulator_force_disable - force disable regulator output
2244 * @regulator: regulator source
2245 *
2246 * Forcibly disable the regulator output voltage or current.
2247 * NOTE: this *will* disable the regulator output even if other consumer
2248 * devices have it enabled. This should be used for situations when device
2249 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2250 */
2251int regulator_force_disable(struct regulator *regulator)
2252{
82d15839 2253 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 2254 int ret;
2255
82d15839 2256 mutex_lock(&rdev->mutex);
414c70cb 2257 regulator->uA_load = 0;
3801b86a 2258 ret = _regulator_force_disable(regulator->rdev);
82d15839 2259 mutex_unlock(&rdev->mutex);
8cbf811d 2260
3801b86a
MB		 2261 if (rdev->supply)
2262 while (rdev->open_count--)
2263 regulator_disable(rdev->supply);
8cbf811d 2264
414c70cb
LG		 2265 return ret;
2266}
2267EXPORT_SYMBOL_GPL(regulator_force_disable);
2268
da07ecd9
MB		 2269static void regulator_disable_work(struct work_struct *work)
2270{
2271 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2272 disable_work.work);
2273 int count, i, ret;
2274
2275 mutex_lock(&rdev->mutex);
2276
2277 BUG_ON(!rdev->deferred_disables);
2278
2279 count = rdev->deferred_disables;
2280 rdev->deferred_disables = 0;
2281
2282 for (i = 0; i < count; i++) {
2283 ret = _regulator_disable(rdev);
2284 if (ret != 0)
2285 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2286 }
2287
2288 mutex_unlock(&rdev->mutex);
2289
2290 if (rdev->supply) {
2291 for (i = 0; i < count; i++) {
2292 ret = regulator_disable(rdev->supply);
2293 if (ret != 0) {
2294 rdev_err(rdev,
2295 "Supply disable failed: %d\n", ret);
2296 }
2297 }
2298 }
2299}
2300
2301/**
2302 * regulator_disable_deferred - disable regulator output with delay
2303 * @regulator: regulator source
2304 * @ms: miliseconds until the regulator is disabled
2305 *
2306 * Execute regulator_disable() on the regulator after a delay. This
2307 * is intended for use with devices that require some time to quiesce.
2308 *
2309 * NOTE: this will only disable the regulator output if no other consumer
2310 * devices have it enabled, the regulator device supports disabling and
2311 * machine constraints permit this operation.
2312 */
2313int regulator_disable_deferred(struct regulator *regulator, int ms)
2314{
2315 struct regulator_dev *rdev = regulator->rdev;
aa59802d 2316 int ret;
da07ecd9 2317
6492bc1b
MB		 2318 if (regulator->always_on)
2319 return 0;
2320
2b5a24a0
MB		 2321 if (!ms)
2322 return regulator_disable(regulator);
2323
da07ecd9
MB		 2324 mutex_lock(&rdev->mutex);
2325 rdev->deferred_disables++;
2326 mutex_unlock(&rdev->mutex);
2327
070260f0
MB		 2328 ret = queue_delayed_work(system_power_efficient_wq,
2329 &rdev->disable_work,
2330 msecs_to_jiffies(ms));
aa59802d
MB		 2331 if (ret < 0)
2332 return ret;
2333 else
2334 return 0;
da07ecd9
MB		 2335}
2336EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2337
414c70cb
LG		 2338static int _regulator_is_enabled(struct regulator_dev *rdev)
2339{
65f73508 2340 /* A GPIO control always takes precedence */
7b74d149 2341 if (rdev->ena_pin)
65f73508
MB		 2342 return rdev->ena_gpio_state;
2343
9a7f6a4c 2344 /* If we don't know then assume that the regulator is always on */
9332546f 2345 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 2346 return 1;
414c70cb 2347
9332546f 2348 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 2349}
2350
3a40cfc3
SH		 2351static int _regulator_list_voltage(struct regulator *regulator,
2352 unsigned selector, int lock)
2353{
2354 struct regulator_dev *rdev = regulator->rdev;
2355 const struct regulator_ops *ops = rdev->desc->ops;
2356 int ret;
2357
2358 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2359 return rdev->desc->fixed_uV;
2360
2361 if (ops->list_voltage) {
2362 if (selector >= rdev->desc->n_voltages)
2363 return -EINVAL;
2364 if (lock)
2365 mutex_lock(&rdev->mutex);
2366 ret = ops->list_voltage(rdev, selector);
2367 if (lock)
2368 mutex_unlock(&rdev->mutex);
2369 } else if (rdev->supply) {
2370 ret = _regulator_list_voltage(rdev->supply, selector, lock);
2371 } else {
2372 return -EINVAL;
2373 }
2374
2375 if (ret > 0) {
2376 if (ret < rdev->constraints->min_uV)
2377 ret = 0;
2378 else if (ret > rdev->constraints->max_uV)
2379 ret = 0;
2380 }
2381
2382 return ret;
2383}
2384
414c70cb
LG		 2385/**
2386 * regulator_is_enabled - is the regulator output enabled
2387 * @regulator: regulator source
2388 *
412aec61
DB		 2389 * Returns positive if the regulator driver backing the source/client
2390 * has requested that the device be enabled, zero if it hasn't, else a
2391 * negative errno code.
2392 *
2393 * Note that the device backing this regulator handle can have multiple
2394 * users, so it might be enabled even if regulator_enable() was never
2395 * called for this particular source.
414c70cb
LG		 2396 */
2397int regulator_is_enabled(struct regulator *regulator)
2398{
9332546f
MB		 2399 int ret;
2400
6492bc1b
MB		 2401 if (regulator->always_on)
2402 return 1;
2403
9332546f
MB		 2404 mutex_lock(&regulator->rdev->mutex);
2405 ret = _regulator_is_enabled(regulator->rdev);
2406 mutex_unlock(&regulator->rdev->mutex);
2407
2408 return ret;
414c70cb
LG		 2409}
2410EXPORT_SYMBOL_GPL(regulator_is_enabled);
2411
d1e7de30
MS		 2412/**
2413 * regulator_can_change_voltage - check if regulator can change voltage
2414 * @regulator: regulator source
2415 *
2416 * Returns positive if the regulator driver backing the source/client
e227867f 2417 * can change its voltage, false otherwise. Useful for detecting fixed
d1e7de30
MS		 2418 * or dummy regulators and disabling voltage change logic in the client
2419 * driver.
2420 */
2421int regulator_can_change_voltage(struct regulator *regulator)
2422{
2423 struct regulator_dev *rdev = regulator->rdev;
2424
2425 if (rdev->constraints &&
19280e40
AL		 2426 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2427 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2428 return 1;
2429
2430 if (rdev->desc->continuous_voltage_range &&
2431 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2432 rdev->constraints->min_uV != rdev->constraints->max_uV)
2433 return 1;
2434 }
d1e7de30
MS		 2435
2436 return 0;
2437}
2438EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2439
4367cfdc
DB		 2440/**
2441 * regulator_count_voltages - count regulator_list_voltage() selectors
2442 * @regulator: regulator source
2443 *
2444 * Returns number of selectors, or negative errno. Selectors are
2445 * numbered starting at zero, and typically correspond to bitfields
2446 * in hardware registers.
2447 */
2448int regulator_count_voltages(struct regulator *regulator)
2449{
2450 struct regulator_dev *rdev = regulator->rdev;
2451
26988efe
JMC		 2452 if (rdev->desc->n_voltages)
2453 return rdev->desc->n_voltages;
2454
2455 if (!rdev->supply)
2456 return -EINVAL;
2457
2458 return regulator_count_voltages(rdev->supply);
4367cfdc
DB		 2459}
2460EXPORT_SYMBOL_GPL(regulator_count_voltages);
2461
2462/**
2463 * regulator_list_voltage - enumerate supported voltages
2464 * @regulator: regulator source
2465 * @selector: identify voltage to list
2466 * Context: can sleep
2467 *
2468 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 2469 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 2470 * negative errno.
2471 */
2472int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2473{
3a40cfc3 2474 return _regulator_list_voltage(regulator, selector, 1);
4367cfdc
DB		 2475}
2476EXPORT_SYMBOL_GPL(regulator_list_voltage);
2477
04eca28c
TT		 2478/**
2479 * regulator_get_regmap - get the regulator's register map
2480 * @regulator: regulator source
2481 *
2482 * Returns the register map for the given regulator, or an ERR_PTR value
2483 * if the regulator doesn't use regmap.
2484 */
2485struct regmap *regulator_get_regmap(struct regulator *regulator)
2486{
2487 struct regmap *map = regulator->rdev->regmap;
2488
2489 return map ? map : ERR_PTR(-EOPNOTSUPP);
2490}
2491
2492/**
2493 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2494 * @regulator: regulator source
2495 * @vsel_reg: voltage selector register, output parameter
2496 * @vsel_mask: mask for voltage selector bitfield, output parameter
2497 *
2498 * Returns the hardware register offset and bitmask used for setting the
2499 * regulator voltage. This might be useful when configuring voltage-scaling
2500 * hardware or firmware that can make I2C requests behind the kernel's back,
2501 * for example.
2502 *
2503 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2504 * and 0 is returned, otherwise a negative errno is returned.
2505 */
2506int regulator_get_hardware_vsel_register(struct regulator *regulator,
2507 unsigned *vsel_reg,
2508 unsigned *vsel_mask)
2509{
39f5460d
GX		 2510 struct regulator_dev *rdev = regulator->rdev;
2511 const struct regulator_ops *ops = rdev->desc->ops;
04eca28c
TT		 2512
2513 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2514 return -EOPNOTSUPP;
2515
2516 *vsel_reg = rdev->desc->vsel_reg;
2517 *vsel_mask = rdev->desc->vsel_mask;
2518
2519 return 0;
2520}
2521EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2522
2523/**
2524 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2525 * @regulator: regulator source
2526 * @selector: identify voltage to list
2527 *
2528 * Converts the selector to a hardware-specific voltage selector that can be
2529 * directly written to the regulator registers. The address of the voltage
2530 * register can be determined by calling @regulator_get_hardware_vsel_register.
2531 *
2532 * On error a negative errno is returned.
2533 */
2534int regulator_list_hardware_vsel(struct regulator *regulator,
2535 unsigned selector)
2536{
39f5460d
GX		 2537 struct regulator_dev *rdev = regulator->rdev;
2538 const struct regulator_ops *ops = rdev->desc->ops;
04eca28c
TT		 2539
2540 if (selector >= rdev->desc->n_voltages)
2541 return -EINVAL;
2542 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2543 return -EOPNOTSUPP;
2544
2545 return selector;
2546}
2547EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2548
2a668a8b
PW		 2549/**
2550 * regulator_get_linear_step - return the voltage step size between VSEL values
2551 * @regulator: regulator source
2552 *
2553 * Returns the voltage step size between VSEL values for linear
2554 * regulators, or return 0 if the regulator isn't a linear regulator.
2555 */
2556unsigned int regulator_get_linear_step(struct regulator *regulator)
2557{
2558 struct regulator_dev *rdev = regulator->rdev;
2559
2560 return rdev->desc->uV_step;
2561}
2562EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2563
a7a1ad90
MB		 2564/**
2565 * regulator_is_supported_voltage - check if a voltage range can be supported
2566 *
2567 * @regulator: Regulator to check.
2568 * @min_uV: Minimum required voltage in uV.
2569 * @max_uV: Maximum required voltage in uV.
2570 *
2571 * Returns a boolean or a negative error code.
2572 */
2573int regulator_is_supported_voltage(struct regulator *regulator,
2574 int min_uV, int max_uV)
2575{
c5f3939b 2576 struct regulator_dev *rdev = regulator->rdev;
a7a1ad90
MB		 2577 int i, voltages, ret;
2578
c5f3939b
MB		 2579 /* If we can't change voltage check the current voltage */
2580 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2581 ret = regulator_get_voltage(regulator);
2582 if (ret >= 0)
0d25d09d 2583 return min_uV <= ret && ret <= max_uV;
c5f3939b
MB		 2584 else
2585 return ret;
2586 }
2587
bd7a2b60
PM		 2588 /* Any voltage within constrains range is fine? */
2589 if (rdev->desc->continuous_voltage_range)
2590 return min_uV >= rdev->constraints->min_uV &&
2591 max_uV <= rdev->constraints->max_uV;
2592
a7a1ad90
MB		 2593 ret = regulator_count_voltages(regulator);
2594 if (ret < 0)
2595 return ret;
2596 voltages = ret;
2597
2598 for (i = 0; i < voltages; i++) {
2599 ret = regulator_list_voltage(regulator, i);
2600
2601 if (ret >= min_uV && ret <= max_uV)
2602 return 1;
2603 }
2604
2605 return 0;
2606}
a398eaa2 2607EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 2608
a204f41e
SH		 2609static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2610 int max_uV)
2611{
2612 const struct regulator_desc *desc = rdev->desc;
2613
2614 if (desc->ops->map_voltage)
2615 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2616
2617 if (desc->ops->list_voltage == regulator_list_voltage_linear)
2618 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2619
2620 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2621 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2622
2623 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2624}
2625
7179569a
HS		 2626static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2627 int min_uV, int max_uV,
2628 unsigned *selector)
2629{
2630 struct pre_voltage_change_data data;
2631 int ret;
2632
2633 data.old_uV = _regulator_get_voltage(rdev);
2634 data.min_uV = min_uV;
2635 data.max_uV = max_uV;
2636 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2637 &data);
2638 if (ret & NOTIFY_STOP_MASK)
2639 return -EINVAL;
2640
2641 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2642 if (ret >= 0)
2643 return ret;
2644
2645 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2646 (void *)data.old_uV);
2647
2648 return ret;
2649}
2650
2651static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2652 int uV, unsigned selector)
2653{
2654 struct pre_voltage_change_data data;
2655 int ret;
2656
2657 data.old_uV = _regulator_get_voltage(rdev);
2658 data.min_uV = uV;
2659 data.max_uV = uV;
2660 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2661 &data);
2662 if (ret & NOTIFY_STOP_MASK)
2663 return -EINVAL;
2664
2665 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2666 if (ret >= 0)
2667 return ret;
2668
2669 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2670 (void *)data.old_uV);
2671
2672 return ret;
2673}
2674
75790251
MB		 2675static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2676 int min_uV, int max_uV)
2677{
2678 int ret;
77af1b26 2679 int delay = 0;
e113d792 2680 int best_val = 0;
75790251 2681 unsigned int selector;
eba41a5e 2682 int old_selector = -1;
75790251
MB		 2683
2684 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2685
bf5892a8
MB		 2686 min_uV += rdev->constraints->uV_offset;
2687 max_uV += rdev->constraints->uV_offset;
2688
eba41a5e
AL		 2689 /*
2690 * If we can't obtain the old selector there is not enough
2691 * info to call set_voltage_time_sel().
2692 */
8b7485ef
AL		 2693 if (_regulator_is_enabled(rdev) &&
2694 rdev->desc->ops->set_voltage_time_sel &&
eba41a5e
AL		 2695 rdev->desc->ops->get_voltage_sel) {
2696 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2697 if (old_selector < 0)
2698 return old_selector;
2699 }
2700
75790251 2701 if (rdev->desc->ops->set_voltage) {
7179569a
HS		 2702 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2703 &selector);
e113d792
MB		 2704
2705 if (ret >= 0) {
2706 if (rdev->desc->ops->list_voltage)
2707 best_val = rdev->desc->ops->list_voltage(rdev,
2708 selector);
2709 else
2710 best_val = _regulator_get_voltage(rdev);
2711 }
2712
e8eef82b 2713 } else if (rdev->desc->ops->set_voltage_sel) {
a204f41e 2714 ret = regulator_map_voltage(rdev, min_uV, max_uV);
e843fc46 2715 if (ret >= 0) {
e113d792
MB		 2716 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2717 if (min_uV <= best_val && max_uV >= best_val) {
2718 selector = ret;
c66a566a
AL		 2719 if (old_selector == selector)
2720 ret = 0;
2721 else
7179569a
HS		 2722 ret = _regulator_call_set_voltage_sel(
2723 rdev, best_val, selector);
e113d792
MB		 2724 } else {
2725 ret = -EINVAL;
2726 }
e8eef82b 2727 }
75790251
MB		 2728 } else {
2729 ret = -EINVAL;
2730 }
e8eef82b 2731
eba41a5e 2732 /* Call set_voltage_time_sel if successfully obtained old_selector */
5b175952
YSB		 2733 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2734 && old_selector != selector) {
77af1b26 2735
eba41a5e
AL		 2736 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2737 old_selector, selector);
2738 if (delay < 0) {
2739 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2740 delay);
2741 delay = 0;
e8eef82b 2742 }
75790251 2743
8b96de31
PR		 2744 /* Insert any necessary delays */
2745 if (delay >= 1000) {
2746 mdelay(delay / 1000);
2747 udelay(delay % 1000);
2748 } else if (delay) {
2749 udelay(delay);
2750 }
77af1b26
LW		 2751 }
2752
2f6c797f
AL		 2753 if (ret == 0 && best_val >= 0) {
2754 unsigned long data = best_val;
2755
ded06a52 2756 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2f6c797f
AL		 2757 (void *)data);
2758 }
ded06a52 2759
eba41a5e 2760 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
75790251
MB		 2761
2762 return ret;
2763}
2764
a9f226bc
SH		 2765static int regulator_set_voltage_unlocked(struct regulator *regulator,
2766 int min_uV, int max_uV)
414c70cb
LG		 2767{
2768 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 2769 int ret = 0;
92d7a558 2770 int old_min_uV, old_max_uV;
c00dc359 2771 int current_uV;
fc42112c
SH		 2772 int best_supply_uV = 0;
2773 int supply_change_uV = 0;
414c70cb 2774
95a3c23a
MB		 2775 /* If we're setting the same range as last time the change
2776 * should be a noop (some cpufreq implementations use the same
2777 * voltage for multiple frequencies, for example).
2778 */
2779 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2780 goto out;
2781
c00dc359 2782 /* If we're trying to set a range that overlaps the current voltage,
d3fb9800 2783 * return successfully even though the regulator does not support
c00dc359
BA		 2784 * changing the voltage.
2785 */
2786 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2787 current_uV = _regulator_get_voltage(rdev);
2788 if (min_uV <= current_uV && current_uV <= max_uV) {
2789 regulator->min_uV = min_uV;
2790 regulator->max_uV = max_uV;
2791 goto out;
2792 }
2793 }
2794
414c70cb 2795 /* sanity check */
e8eef82b
MB		 2796 if (!rdev->desc->ops->set_voltage &&
2797 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 2798 ret = -EINVAL;
2799 goto out;
2800 }
2801
2802 /* constraints check */
2803 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2804 if (ret < 0)
2805 goto out;
0d25d09d 2806
92d7a558
PP		 2807 /* restore original values in case of error */
2808 old_min_uV = regulator->min_uV;
2809 old_max_uV = regulator->max_uV;
414c70cb
LG		 2810 regulator->min_uV = min_uV;
2811 regulator->max_uV = max_uV;
3a93f2a9 2812
05fda3b1
TP		 2813 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2814 if (ret < 0)
92d7a558 2815 goto out2;
05fda3b1 2816
fc42112c
SH		 2817 if (rdev->supply && (rdev->desc->min_dropout_uV ||
2818 !rdev->desc->ops->get_voltage)) {
2819 int current_supply_uV;
2820 int selector;
2821
2822 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2823 if (selector < 0) {
2824 ret = selector;
2825 goto out2;
2826 }
2827
2828 best_supply_uV = _regulator_list_voltage(regulator, selector, 0);
2829 if (best_supply_uV < 0) {
2830 ret = best_supply_uV;
2831 goto out2;
2832 }
2833
2834 best_supply_uV += rdev->desc->min_dropout_uV;
2835
2836 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2837 if (current_supply_uV < 0) {
2838 ret = current_supply_uV;
2839 goto out2;
2840 }
2841
2842 supply_change_uV = best_supply_uV - current_supply_uV;
2843 }
2844
2845 if (supply_change_uV > 0) {
2846 ret = regulator_set_voltage_unlocked(rdev->supply,
2847 best_supply_uV, INT_MAX);
2848 if (ret) {
2849 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
2850 ret);
2851 goto out2;
2852 }
2853 }
2854
75790251 2855 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
92d7a558
PP		 2856 if (ret < 0)
2857 goto out2;
0d25d09d 2858
fc42112c
SH		 2859 if (supply_change_uV < 0) {
2860 ret = regulator_set_voltage_unlocked(rdev->supply,
2861 best_supply_uV, INT_MAX);
2862 if (ret)
2863 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
2864 ret);
2865 /* No need to fail here */
2866 ret = 0;
2867 }
2868
414c70cb 2869out:
414c70cb 2870 return ret;
92d7a558
PP		 2871out2:
2872 regulator->min_uV = old_min_uV;
2873 regulator->max_uV = old_max_uV;
a9f226bc
SH		 2874
2875 return ret;
2876}
2877
2878/**
2879 * regulator_set_voltage - set regulator output voltage
2880 * @regulator: regulator source
2881 * @min_uV: Minimum required voltage in uV
2882 * @max_uV: Maximum acceptable voltage in uV
2883 *
2884 * Sets a voltage regulator to the desired output voltage. This can be set
2885 * during any regulator state. IOW, regulator can be disabled or enabled.
2886 *
2887 * If the regulator is enabled then the voltage will change to the new value
2888 * immediately otherwise if the regulator is disabled the regulator will
2889 * output at the new voltage when enabled.
2890 *
2891 * NOTE: If the regulator is shared between several devices then the lowest
2892 * request voltage that meets the system constraints will be used.
2893 * Regulator system constraints must be set for this regulator before
2894 * calling this function otherwise this call will fail.
2895 */
2896int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2897{
2898 int ret = 0;
2899
fc42112c 2900 regulator_lock_supply(regulator->rdev);
a9f226bc
SH		 2901
2902 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
2903
fc42112c 2904 regulator_unlock_supply(regulator->rdev);
a9f226bc 2905
414c70cb
LG		 2906 return ret;
2907}
2908EXPORT_SYMBOL_GPL(regulator_set_voltage);
2909
88cd222b
LW		 2910/**
2911 * regulator_set_voltage_time - get raise/fall time
2912 * @regulator: regulator source
2913 * @old_uV: starting voltage in microvolts
2914 * @new_uV: target voltage in microvolts
2915 *
2916 * Provided with the starting and ending voltage, this function attempts to
2917 * calculate the time in microseconds required to rise or fall to this new
2918 * voltage.
2919 */
2920int regulator_set_voltage_time(struct regulator *regulator,
2921 int old_uV, int new_uV)
2922{
272e2315
GX		 2923 struct regulator_dev *rdev = regulator->rdev;
2924 const struct regulator_ops *ops = rdev->desc->ops;
88cd222b
LW		 2925 int old_sel = -1;
2926 int new_sel = -1;
2927 int voltage;
2928 int i;
2929
2930 /* Currently requires operations to do this */
2931 if (!ops->list_voltage || !ops->set_voltage_time_sel
2932 || !rdev->desc->n_voltages)
2933 return -EINVAL;
2934
2935 for (i = 0; i < rdev->desc->n_voltages; i++) {
2936 /* We only look for exact voltage matches here */
2937 voltage = regulator_list_voltage(regulator, i);
2938 if (voltage < 0)
2939 return -EINVAL;
2940 if (voltage == 0)
2941 continue;
2942 if (voltage == old_uV)
2943 old_sel = i;
2944 if (voltage == new_uV)
2945 new_sel = i;
2946 }
2947
2948 if (old_sel < 0 || new_sel < 0)
2949 return -EINVAL;
2950
2951 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2952}
2953EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2954
98a175b6 2955/**
296c6566
RD		 2956 * regulator_set_voltage_time_sel - get raise/fall time
2957 * @rdev: regulator source device
98a175b6
YSB		 2958 * @old_selector: selector for starting voltage
2959 * @new_selector: selector for target voltage
2960 *
2961 * Provided with the starting and target voltage selectors, this function
2962 * returns time in microseconds required to rise or fall to this new voltage
2963 *
f11d08c3 2964 * Drivers providing ramp_delay in regulation_constraints can use this as their
398715ab 2965 * set_voltage_time_sel() operation.
98a175b6
YSB		 2966 */
2967int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2968 unsigned int old_selector,
2969 unsigned int new_selector)
2970{
398715ab 2971 unsigned int ramp_delay = 0;
f11d08c3 2972 int old_volt, new_volt;
398715ab
AL		 2973
2974 if (rdev->constraints->ramp_delay)
2975 ramp_delay = rdev->constraints->ramp_delay;
2976 else if (rdev->desc->ramp_delay)
2977 ramp_delay = rdev->desc->ramp_delay;
2978
2979 if (ramp_delay == 0) {
6f0b2c69 2980 rdev_warn(rdev, "ramp_delay not set\n");
398715ab 2981 return 0;
6f0b2c69 2982 }
398715ab 2983
f11d08c3
AL		 2984 /* sanity check */
2985 if (!rdev->desc->ops->list_voltage)
2986 return -EINVAL;
398715ab 2987
f11d08c3
AL		 2988 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2989 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2990
2991 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
98a175b6 2992}
b19dbf71 2993EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
98a175b6 2994
606a2562
MB		 2995/**
2996 * regulator_sync_voltage - re-apply last regulator output voltage
2997 * @regulator: regulator source
2998 *
2999 * Re-apply the last configured voltage. This is intended to be used
3000 * where some external control source the consumer is cooperating with
3001 * has caused the configured voltage to change.
3002 */
3003int regulator_sync_voltage(struct regulator *regulator)
3004{
3005 struct regulator_dev *rdev = regulator->rdev;
3006 int ret, min_uV, max_uV;
3007
3008 mutex_lock(&rdev->mutex);
3009
3010 if (!rdev->desc->ops->set_voltage &&
3011 !rdev->desc->ops->set_voltage_sel) {
3012 ret = -EINVAL;
3013 goto out;
3014 }
3015
3016 /* This is only going to work if we've had a voltage configured. */
3017 if (!regulator->min_uV && !regulator->max_uV) {
3018 ret = -EINVAL;
3019 goto out;
3020 }
3021
3022 min_uV = regulator->min_uV;
3023 max_uV = regulator->max_uV;
3024
3025 /* This should be a paranoia check... */
3026 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3027 if (ret < 0)
3028 goto out;
3029
3030 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
3031 if (ret < 0)
3032 goto out;
3033
3034 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3035
3036out:
3037 mutex_unlock(&rdev->mutex);
3038 return ret;
3039}
3040EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3041
414c70cb
LG		 3042static int _regulator_get_voltage(struct regulator_dev *rdev)
3043{
bf5892a8 3044 int sel, ret;
476c2d83
MB		 3045
3046 if (rdev->desc->ops->get_voltage_sel) {
3047 sel = rdev->desc->ops->get_voltage_sel(rdev);
3048 if (sel < 0)
3049 return sel;
bf5892a8 3050 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 3051 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 3052 ret = rdev->desc->ops->get_voltage(rdev);
f7df20ec
MB		 3053 } else if (rdev->desc->ops->list_voltage) {
3054 ret = rdev->desc->ops->list_voltage(rdev, 0);
5a523605
LD		 3055 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3056 ret = rdev->desc->fixed_uV;
e303996e
JMC		 3057 } else if (rdev->supply) {
3058 ret = regulator_get_voltage(rdev->supply);
cb220d16 3059 } else {
414c70cb 3060 return -EINVAL;
cb220d16 3061 }
bf5892a8 3062
cb220d16
AL		 3063 if (ret < 0)
3064 return ret;
bf5892a8 3065 return ret - rdev->constraints->uV_offset;
414c70cb
LG		 3066}
3067
3068/**
3069 * regulator_get_voltage - get regulator output voltage
3070 * @regulator: regulator source
3071 *
3072 * This returns the current regulator voltage in uV.
3073 *
3074 * NOTE: If the regulator is disabled it will return the voltage value. This
3075 * function should not be used to determine regulator state.
3076 */
3077int regulator_get_voltage(struct regulator *regulator)
3078{
3079 int ret;
3080
3081 mutex_lock(&regulator->rdev->mutex);
3082
3083 ret = _regulator_get_voltage(regulator->rdev);
3084
3085 mutex_unlock(&regulator->rdev->mutex);
3086
3087 return ret;
3088}
3089EXPORT_SYMBOL_GPL(regulator_get_voltage);
3090
3091/**
3092 * regulator_set_current_limit - set regulator output current limit
3093 * @regulator: regulator source
ce0d10f8 3094 * @min_uA: Minimum supported current in uA
414c70cb
LG		 3095 * @max_uA: Maximum supported current in uA
3096 *
3097 * Sets current sink to the desired output current. This can be set during
3098 * any regulator state. IOW, regulator can be disabled or enabled.
3099 *
3100 * If the regulator is enabled then the current will change to the new value
3101 * immediately otherwise if the regulator is disabled the regulator will
3102 * output at the new current when enabled.
3103 *
3104 * NOTE: Regulator system constraints must be set for this regulator before
3105 * calling this function otherwise this call will fail.
3106 */
3107int regulator_set_current_limit(struct regulator *regulator,
3108 int min_uA, int max_uA)
3109{
3110 struct regulator_dev *rdev = regulator->rdev;
3111 int ret;
3112
3113 mutex_lock(&rdev->mutex);
3114
3115 /* sanity check */
3116 if (!rdev->desc->ops->set_current_limit) {
3117 ret = -EINVAL;
3118 goto out;
3119 }
3120
3121 /* constraints check */
3122 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3123 if (ret < 0)
3124 goto out;
3125
3126 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3127out:
3128 mutex_unlock(&rdev->mutex);
3129 return ret;
3130}
3131EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3132
3133static int _regulator_get_current_limit(struct regulator_dev *rdev)
3134{
3135 int ret;
3136
3137 mutex_lock(&rdev->mutex);
3138
3139 /* sanity check */
3140 if (!rdev->desc->ops->get_current_limit) {
3141 ret = -EINVAL;
3142 goto out;
3143 }
3144
3145 ret = rdev->desc->ops->get_current_limit(rdev);
3146out:
3147 mutex_unlock(&rdev->mutex);
3148 return ret;
3149}
3150
3151/**
3152 * regulator_get_current_limit - get regulator output current
3153 * @regulator: regulator source
3154 *
3155 * This returns the current supplied by the specified current sink in uA.
3156 *
3157 * NOTE: If the regulator is disabled it will return the current value. This
3158 * function should not be used to determine regulator state.
3159 */
3160int regulator_get_current_limit(struct regulator *regulator)
3161{
3162 return _regulator_get_current_limit(regulator->rdev);
3163}
3164EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3165
3166/**
3167 * regulator_set_mode - set regulator operating mode
3168 * @regulator: regulator source
3169 * @mode: operating mode - one of the REGULATOR_MODE constants
3170 *
3171 * Set regulator operating mode to increase regulator efficiency or improve
3172 * regulation performance.
3173 *
3174 * NOTE: Regulator system constraints must be set for this regulator before
3175 * calling this function otherwise this call will fail.
3176 */
3177int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3178{
3179 struct regulator_dev *rdev = regulator->rdev;
3180 int ret;
500b4ac9 3181 int regulator_curr_mode;
414c70cb
LG		 3182
3183 mutex_lock(&rdev->mutex);
3184
3185 /* sanity check */
3186 if (!rdev->desc->ops->set_mode) {
3187 ret = -EINVAL;
3188 goto out;
3189 }
3190
500b4ac9
SI		 3191 /* return if the same mode is requested */
3192 if (rdev->desc->ops->get_mode) {
3193 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3194 if (regulator_curr_mode == mode) {
3195 ret = 0;
3196 goto out;
3197 }
3198 }
3199
414c70cb 3200 /* constraints check */
22c51b47 3201 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 3202 if (ret < 0)
3203 goto out;
3204
3205 ret = rdev->desc->ops->set_mode(rdev, mode);
3206out:
3207 mutex_unlock(&rdev->mutex);
3208 return ret;
3209}
3210EXPORT_SYMBOL_GPL(regulator_set_mode);
3211
3212static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3213{
3214 int ret;
3215
3216 mutex_lock(&rdev->mutex);
3217
3218 /* sanity check */
3219 if (!rdev->desc->ops->get_mode) {
3220 ret = -EINVAL;
3221 goto out;
3222 }
3223
3224 ret = rdev->desc->ops->get_mode(rdev);
3225out:
3226 mutex_unlock(&rdev->mutex);
3227 return ret;
3228}
3229
3230/**
3231 * regulator_get_mode - get regulator operating mode
3232 * @regulator: regulator source
3233 *
3234 * Get the current regulator operating mode.
3235 */
3236unsigned int regulator_get_mode(struct regulator *regulator)
3237{
3238 return _regulator_get_mode(regulator->rdev);
3239}
3240EXPORT_SYMBOL_GPL(regulator_get_mode);
3241
3242/**
e39ce48f 3243 * regulator_set_load - set regulator load
414c70cb
LG		 3244 * @regulator: regulator source
3245 * @uA_load: load current
3246 *
3247 * Notifies the regulator core of a new device load. This is then used by
3248 * DRMS (if enabled by constraints) to set the most efficient regulator
3249 * operating mode for the new regulator loading.
3250 *
3251 * Consumer devices notify their supply regulator of the maximum power
3252 * they will require (can be taken from device datasheet in the power
3253 * consumption tables) when they change operational status and hence power
3254 * state. Examples of operational state changes that can affect power
3255 * consumption are :-
3256 *
3257 * o Device is opened / closed.
3258 * o Device I/O is about to begin or has just finished.
3259 * o Device is idling in between work.
3260 *
3261 * This information is also exported via sysfs to userspace.
3262 *
3263 * DRMS will sum the total requested load on the regulator and change
3264 * to the most efficient operating mode if platform constraints allow.
3265 *
e39ce48f 3266 * On error a negative errno is returned.
414c70cb 3267 */
e39ce48f 3268int regulator_set_load(struct regulator *regulator, int uA_load)
414c70cb
LG		 3269{
3270 struct regulator_dev *rdev = regulator->rdev;
8460ef38 3271 int ret;
d92d95b6 3272
414c70cb 3273 mutex_lock(&rdev->mutex);
414c70cb 3274 regulator->uA_load = uA_load;
8460ef38 3275 ret = drms_uA_update(rdev);
414c70cb 3276 mutex_unlock(&rdev->mutex);
8460ef38 3277
414c70cb
LG		 3278 return ret;
3279}
e39ce48f 3280EXPORT_SYMBOL_GPL(regulator_set_load);
414c70cb 3281
f59c8f9f
MB		 3282/**
3283 * regulator_allow_bypass - allow the regulator to go into bypass mode
3284 *
3285 * @regulator: Regulator to configure
9345dfb8 3286 * @enable: enable or disable bypass mode
f59c8f9f
MB		 3287 *
3288 * Allow the regulator to go into bypass mode if all other consumers
3289 * for the regulator also enable bypass mode and the machine
3290 * constraints allow this. Bypass mode means that the regulator is
3291 * simply passing the input directly to the output with no regulation.
3292 */
3293int regulator_allow_bypass(struct regulator *regulator, bool enable)
3294{
3295 struct regulator_dev *rdev = regulator->rdev;
3296 int ret = 0;
3297
3298 if (!rdev->desc->ops->set_bypass)
3299 return 0;
3300
3301 if (rdev->constraints &&
3302 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3303 return 0;
3304
3305 mutex_lock(&rdev->mutex);
3306
3307 if (enable && !regulator->bypass) {
3308 rdev->bypass_count++;
3309
3310 if (rdev->bypass_count == rdev->open_count) {
3311 ret = rdev->desc->ops->set_bypass(rdev, enable);
3312 if (ret != 0)
3313 rdev->bypass_count--;
3314 }
3315
3316 } else if (!enable && regulator->bypass) {
3317 rdev->bypass_count--;
3318
3319 if (rdev->bypass_count != rdev->open_count) {
3320 ret = rdev->desc->ops->set_bypass(rdev, enable);
3321 if (ret != 0)
3322 rdev->bypass_count++;
3323 }
3324 }
3325
3326 if (ret == 0)
3327 regulator->bypass = enable;
3328
3329 mutex_unlock(&rdev->mutex);
3330
3331 return ret;
3332}
3333EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3334
414c70cb
LG		 3335/**
3336 * regulator_register_notifier - register regulator event notifier
3337 * @regulator: regulator source
69279fb9 3338 * @nb: notifier block
414c70cb
LG		 3339 *
3340 * Register notifier block to receive regulator events.
3341 */
3342int regulator_register_notifier(struct regulator *regulator,
3343 struct notifier_block *nb)
3344{
3345 return blocking_notifier_chain_register(&regulator->rdev->notifier,
3346 nb);
3347}
3348EXPORT_SYMBOL_GPL(regulator_register_notifier);
3349
3350/**
3351 * regulator_unregister_notifier - unregister regulator event notifier
3352 * @regulator: regulator source
69279fb9 3353 * @nb: notifier block
414c70cb
LG		 3354 *
3355 * Unregister regulator event notifier block.
3356 */
3357int regulator_unregister_notifier(struct regulator *regulator,
3358 struct notifier_block *nb)
3359{
3360 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
3361 nb);
3362}
3363EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3364
b136fb44
JC		 3365/* notify regulator consumers and downstream regulator consumers.
3366 * Note mutex must be held by caller.
3367 */
7179569a 3368static int _notifier_call_chain(struct regulator_dev *rdev,
414c70cb
LG		 3369 unsigned long event, void *data)
3370{
414c70cb 3371 /* call rdev chain first */
7179569a 3372 return blocking_notifier_call_chain(&rdev->notifier, event, data);
414c70cb
LG		 3373}
3374
3375/**
3376 * regulator_bulk_get - get multiple regulator consumers
3377 *
3378 * @dev: Device to supply
3379 * @num_consumers: Number of consumers to register
3380 * @consumers: Configuration of consumers; clients are stored here.
3381 *
3382 * @return 0 on success, an errno on failure.
3383 *
3384 * This helper function allows drivers to get several regulator
3385 * consumers in one operation. If any of the regulators cannot be
3386 * acquired then any regulators that were allocated will be freed
3387 * before returning to the caller.
3388 */
3389int regulator_bulk_get(struct device *dev, int num_consumers,
3390 struct regulator_bulk_data *consumers)
3391{
3392 int i;
3393 int ret;
3394
3395 for (i = 0; i < num_consumers; i++)
3396 consumers[i].consumer = NULL;
3397
3398 for (i = 0; i < num_consumers; i++) {
3399 consumers[i].consumer = regulator_get(dev,
3400 consumers[i].supply);
3401 if (IS_ERR(consumers[i].consumer)) {
414c70cb 3402 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 3403 dev_err(dev, "Failed to get supply '%s': %d\n",
3404 consumers[i].supply, ret);
414c70cb
LG		 3405 consumers[i].consumer = NULL;
3406 goto err;
3407 }
3408 }
3409
3410 return 0;
3411
3412err:
b29c7690 3413 while (--i >= 0)
414c70cb
LG		 3414 regulator_put(consumers[i].consumer);
3415
3416 return ret;
3417}
3418EXPORT_SYMBOL_GPL(regulator_bulk_get);
3419
f21e0e81
MB		 3420static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3421{
3422 struct regulator_bulk_data *bulk = data;
3423
3424 bulk->ret = regulator_enable(bulk->consumer);
3425}
3426
414c70cb
LG		 3427/**
3428 * regulator_bulk_enable - enable multiple regulator consumers
3429 *
3430 * @num_consumers: Number of consumers
3431 * @consumers: Consumer data; clients are stored here.
3432 * @return 0 on success, an errno on failure
3433 *
3434 * This convenience API allows consumers to enable multiple regulator
3435 * clients in a single API call. If any consumers cannot be enabled
3436 * then any others that were enabled will be disabled again prior to
3437 * return.
3438 */
3439int regulator_bulk_enable(int num_consumers,
3440 struct regulator_bulk_data *consumers)
3441{
2955b47d 3442 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
414c70cb 3443 int i;
f21e0e81 3444 int ret = 0;
414c70cb 3445
6492bc1b
MB		 3446 for (i = 0; i < num_consumers; i++) {
3447 if (consumers[i].consumer->always_on)
3448 consumers[i].ret = 0;
3449 else
3450 async_schedule_domain(regulator_bulk_enable_async,
3451 &consumers[i], &async_domain);
3452 }
f21e0e81
MB		 3453
3454 async_synchronize_full_domain(&async_domain);
3455
3456 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 3457 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 3458 if (consumers[i].ret != 0) {
3459 ret = consumers[i].ret;
414c70cb 3460 goto err;
f21e0e81 3461 }
414c70cb
LG		 3462 }
3463
3464 return 0;
3465
3466err:
fbe31057
AH		 3467 for (i = 0; i < num_consumers; i++) {
3468 if (consumers[i].ret < 0)
3469 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3470 consumers[i].ret);
3471 else
3472 regulator_disable(consumers[i].consumer);
3473 }
414c70cb
LG		 3474
3475 return ret;
3476}
3477EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3478
3479/**
3480 * regulator_bulk_disable - disable multiple regulator consumers
3481 *
3482 * @num_consumers: Number of consumers
3483 * @consumers: Consumer data; clients are stored here.
3484 * @return 0 on success, an errno on failure
3485 *
3486 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 3487 * clients in a single API call. If any consumers cannot be disabled
3488 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 3489 * return.
3490 */
3491int regulator_bulk_disable(int num_consumers,
3492 struct regulator_bulk_data *consumers)
3493{
3494 int i;
01e86f49 3495 int ret, r;
414c70cb 3496
49e22632 3497 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 3498 ret = regulator_disable(consumers[i].consumer);
3499 if (ret != 0)
3500 goto err;
3501 }
3502
3503 return 0;
3504
3505err:
5da84fd9 3506 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
01e86f49
MB		 3507 for (++i; i < num_consumers; ++i) {
3508 r = regulator_enable(consumers[i].consumer);
3509 if (r != 0)
3510 pr_err("Failed to reename %s: %d\n",
3511 consumers[i].supply, r);
3512 }
414c70cb
LG		 3513
3514 return ret;
3515}
3516EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3517
e1de2f42
DK		 3518/**
3519 * regulator_bulk_force_disable - force disable multiple regulator consumers
3520 *
3521 * @num_consumers: Number of consumers
3522 * @consumers: Consumer data; clients are stored here.
3523 * @return 0 on success, an errno on failure
3524 *
3525 * This convenience API allows consumers to forcibly disable multiple regulator
3526 * clients in a single API call.
3527 * NOTE: This should be used for situations when device damage will
3528 * likely occur if the regulators are not disabled (e.g. over temp).
3529 * Although regulator_force_disable function call for some consumers can
3530 * return error numbers, the function is called for all consumers.
3531 */
3532int regulator_bulk_force_disable(int num_consumers,
3533 struct regulator_bulk_data *consumers)
3534{
3535 int i;
3536 int ret;
3537
3538 for (i = 0; i < num_consumers; i++)
3539 consumers[i].ret =
3540 regulator_force_disable(consumers[i].consumer);
3541
3542 for (i = 0; i < num_consumers; i++) {
3543 if (consumers[i].ret != 0) {
3544 ret = consumers[i].ret;
3545 goto out;
3546 }
3547 }
3548
3549 return 0;
3550out:
3551 return ret;
3552}
3553EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3554
414c70cb
LG		 3555/**
3556 * regulator_bulk_free - free multiple regulator consumers
3557 *
3558 * @num_consumers: Number of consumers
3559 * @consumers: Consumer data; clients are stored here.
3560 *
3561 * This convenience API allows consumers to free multiple regulator
3562 * clients in a single API call.
3563 */
3564void regulator_bulk_free(int num_consumers,
3565 struct regulator_bulk_data *consumers)
3566{
3567 int i;
3568
3569 for (i = 0; i < num_consumers; i++) {
3570 regulator_put(consumers[i].consumer);
3571 consumers[i].consumer = NULL;
3572 }
3573}
3574EXPORT_SYMBOL_GPL(regulator_bulk_free);
3575
3576/**
3577 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 3578 * @rdev: regulator source
414c70cb 3579 * @event: notifier block
69279fb9 3580 * @data: callback-specific data.
414c70cb
LG		 3581 *
3582 * Called by regulator drivers to notify clients a regulator event has
3583 * occurred. We also notify regulator clients downstream.
b136fb44 3584 * Note lock must be held by caller.
414c70cb
LG		 3585 */
3586int regulator_notifier_call_chain(struct regulator_dev *rdev,
3587 unsigned long event, void *data)
3588{
70cfef26
KK		 3589 lockdep_assert_held_once(&rdev->mutex);
3590
414c70cb
LG		 3591 _notifier_call_chain(rdev, event, data);
3592 return NOTIFY_DONE;
3593
3594}
3595EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3596
be721979
MB		 3597/**
3598 * regulator_mode_to_status - convert a regulator mode into a status
3599 *
3600 * @mode: Mode to convert
3601 *
3602 * Convert a regulator mode into a status.
3603 */
3604int regulator_mode_to_status(unsigned int mode)
3605{
3606 switch (mode) {
3607 case REGULATOR_MODE_FAST:
3608 return REGULATOR_STATUS_FAST;
3609 case REGULATOR_MODE_NORMAL:
3610 return REGULATOR_STATUS_NORMAL;
3611 case REGULATOR_MODE_IDLE:
3612 return REGULATOR_STATUS_IDLE;
03ffcf3d 3613 case REGULATOR_MODE_STANDBY:
be721979
MB		 3614 return REGULATOR_STATUS_STANDBY;
3615 default:
1beaf762 3616 return REGULATOR_STATUS_UNDEFINED;
be721979
MB		 3617 }
3618}
3619EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3620
39f802d6
TI		 3621static struct attribute *regulator_dev_attrs[] = {
3622 &dev_attr_name.attr,
3623 &dev_attr_num_users.attr,
3624 &dev_attr_type.attr,
3625 &dev_attr_microvolts.attr,
3626 &dev_attr_microamps.attr,
3627 &dev_attr_opmode.attr,
3628 &dev_attr_state.attr,
3629 &dev_attr_status.attr,
3630 &dev_attr_bypass.attr,
3631 &dev_attr_requested_microamps.attr,
3632 &dev_attr_min_microvolts.attr,
3633 &dev_attr_max_microvolts.attr,
3634 &dev_attr_min_microamps.attr,
3635 &dev_attr_max_microamps.attr,
3636 &dev_attr_suspend_standby_state.attr,
3637 &dev_attr_suspend_mem_state.attr,
3638 &dev_attr_suspend_disk_state.attr,
3639 &dev_attr_suspend_standby_microvolts.attr,
3640 &dev_attr_suspend_mem_microvolts.attr,
3641 &dev_attr_suspend_disk_microvolts.attr,
3642 &dev_attr_suspend_standby_mode.attr,
3643 &dev_attr_suspend_mem_mode.attr,
3644 &dev_attr_suspend_disk_mode.attr,
3645 NULL
3646};
3647
7ad68e2f
DB		 3648/*
3649 * To avoid cluttering sysfs (and memory) with useless state, only
3650 * create attributes that can be meaningfully displayed.
3651 */
39f802d6
TI		 3652static umode_t regulator_attr_is_visible(struct kobject *kobj,
3653 struct attribute *attr, int idx)
7ad68e2f 3654{
39f802d6
TI		 3655 struct device *dev = kobj_to_dev(kobj);
3656 struct regulator_dev *rdev = container_of(dev, struct regulator_dev, dev);
272e2315 3657 const struct regulator_ops *ops = rdev->desc->ops;
39f802d6
TI		 3658 umode_t mode = attr->mode;
3659
3660 /* these three are always present */
3661 if (attr == &dev_attr_name.attr ||
3662 attr == &dev_attr_num_users.attr ||
3663 attr == &dev_attr_type.attr)
3664 return mode;
7ad68e2f
DB		 3665
3666 /* some attributes need specific methods to be displayed */
39f802d6
TI		 3667 if (attr == &dev_attr_microvolts.attr) {
3668 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3669 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3670 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3671 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3672 return mode;
3673 return 0;
f59c8f9f 3674 }
7ad68e2f 3675
39f802d6
TI		 3676 if (attr == &dev_attr_microamps.attr)
3677 return ops->get_current_limit ? mode : 0;
3678
3679 if (attr == &dev_attr_opmode.attr)
3680 return ops->get_mode ? mode : 0;
3681
3682 if (attr == &dev_attr_state.attr)
3683 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3684
3685 if (attr == &dev_attr_status.attr)
3686 return ops->get_status ? mode : 0;
3687
3688 if (attr == &dev_attr_bypass.attr)
3689 return ops->get_bypass ? mode : 0;
3690
7ad68e2f 3691 /* some attributes are type-specific */
39f802d6
TI		 3692 if (attr == &dev_attr_requested_microamps.attr)
3693 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
7ad68e2f 3694
7ad68e2f 3695 /* constraints need specific supporting methods */
39f802d6
TI		 3696 if (attr == &dev_attr_min_microvolts.attr ||
3697 attr == &dev_attr_max_microvolts.attr)
3698 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3699
3700 if (attr == &dev_attr_min_microamps.attr ||
3701 attr == &dev_attr_max_microamps.attr)
3702 return ops->set_current_limit ? mode : 0;
3703
3704 if (attr == &dev_attr_suspend_standby_state.attr ||
3705 attr == &dev_attr_suspend_mem_state.attr ||
3706 attr == &dev_attr_suspend_disk_state.attr)
3707 return mode;
3708
3709 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3710 attr == &dev_attr_suspend_mem_microvolts.attr ||
3711 attr == &dev_attr_suspend_disk_microvolts.attr)
3712 return ops->set_suspend_voltage ? mode : 0;
3713
3714 if (attr == &dev_attr_suspend_standby_mode.attr ||
3715 attr == &dev_attr_suspend_mem_mode.attr ||
3716 attr == &dev_attr_suspend_disk_mode.attr)
3717 return ops->set_suspend_mode ? mode : 0;
3718
3719 return mode;
3720}
3721
3722static const struct attribute_group regulator_dev_group = {
3723 .attrs = regulator_dev_attrs,
3724 .is_visible = regulator_attr_is_visible,
3725};
3726
3727static const struct attribute_group *regulator_dev_groups[] = {
3728 &regulator_dev_group,
3729 NULL
3730};
7ad68e2f 3731
39f802d6
TI		 3732static void regulator_dev_release(struct device *dev)
3733{
3734 struct regulator_dev *rdev = dev_get_drvdata(dev);
29f5f486
MB		 3735
3736 kfree(rdev->constraints);
3737 of_node_put(rdev->dev.of_node);
39f802d6 3738 kfree(rdev);
7ad68e2f
DB		 3739}
3740
39f802d6
TI		 3741static struct class regulator_class = {
3742 .name = "regulator",
3743 .dev_release = regulator_dev_release,
3744 .dev_groups = regulator_dev_groups,
3745};
3746
1130e5b3
MB		 3747static void rdev_init_debugfs(struct regulator_dev *rdev)
3748{
a9eaa813
GR		 3749 struct device *parent = rdev->dev.parent;
3750 const char *rname = rdev_get_name(rdev);
3751 char name[NAME_MAX];
3752
3753 /* Avoid duplicate debugfs directory names */
3754 if (parent && rname == rdev->desc->name) {
3755 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3756 rname);
3757 rname = name;
3758 }
3759
3760 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
24751434 3761 if (!rdev->debugfs) {
1130e5b3 3762 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 3763 return;
3764 }
3765
3766 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3767 &rdev->use_count);
3768 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3769 &rdev->open_count);
f59c8f9f
MB		 3770 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3771 &rdev->bypass_count);
1130e5b3
MB		 3772}
3773
414c70cb
LG		 3774/**
3775 * regulator_register - register regulator
69279fb9 3776 * @regulator_desc: regulator to register
f47531b1 3777 * @cfg: runtime configuration for regulator
414c70cb
LG		 3778 *
3779 * Called by regulator drivers to register a regulator.
0384618a
AL		 3780 * Returns a valid pointer to struct regulator_dev on success
3781 * or an ERR_PTR() on error.
414c70cb 3782 */
65f26846
MB		 3783struct regulator_dev *
3784regulator_register(const struct regulator_desc *regulator_desc,
1b3de223 3785 const struct regulator_config *cfg)
414c70cb 3786{
9a8f5e07 3787 const struct regulation_constraints *constraints = NULL;
c172708d 3788 const struct regulator_init_data *init_data;
1b3de223 3789 struct regulator_config *config = NULL;
72dca06f 3790 static atomic_t regulator_no = ATOMIC_INIT(-1);
414c70cb 3791 struct regulator_dev *rdev;
32c8fad4 3792 struct device *dev;
a5766f11 3793 int ret, i;
414c70cb 3794
1b3de223 3795 if (regulator_desc == NULL || cfg == NULL)
414c70cb
LG		 3796 return ERR_PTR(-EINVAL);
3797
1b3de223 3798 dev = cfg->dev;
dcf70112 3799 WARN_ON(!dev);
32c8fad4 3800
414c70cb
LG		 3801 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3802 return ERR_PTR(-EINVAL);
3803
cd78dfc6
DL		 3804 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3805 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 3806 return ERR_PTR(-EINVAL);
3807
476c2d83
MB		 3808 /* Only one of each should be implemented */
3809 WARN_ON(regulator_desc->ops->get_voltage &&
3810 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 3811 WARN_ON(regulator_desc->ops->set_voltage &&
3812 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 3813
3814 /* If we're using selectors we must implement list_voltage. */
3815 if (regulator_desc->ops->get_voltage_sel &&
3816 !regulator_desc->ops->list_voltage) {
3817 return ERR_PTR(-EINVAL);
3818 }
e8eef82b
MB		 3819 if (regulator_desc->ops->set_voltage_sel &&
3820 !regulator_desc->ops->list_voltage) {
3821 return ERR_PTR(-EINVAL);
3822 }
476c2d83 3823
414c70cb
LG		 3824 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3825 if (rdev == NULL)
3826 return ERR_PTR(-ENOMEM);
3827
1b3de223
KK		 3828 /*
3829 * Duplicate the config so the driver could override it after
3830 * parsing init data.
3831 */
3832 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
3833 if (config == NULL) {
3834 kfree(rdev);
3835 return ERR_PTR(-ENOMEM);
3836 }
3837
bfa21a0d 3838 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
a0c7b164
MB		 3839 &rdev->dev.of_node);
3840 if (!init_data) {
3841 init_data = config->init_data;
3842 rdev->dev.of_node = of_node_get(config->of_node);
3843 }
3844
414c70cb
LG		 3845 mutex_lock(&regulator_list_mutex);
3846
3847 mutex_init(&rdev->mutex);
c172708d 3848 rdev->reg_data = config->driver_data;
414c70cb
LG		 3849 rdev->owner = regulator_desc->owner;
3850 rdev->desc = regulator_desc;
3a4b0a07
MB		 3851 if (config->regmap)
3852 rdev->regmap = config->regmap;
52b84dac 3853 else if (dev_get_regmap(dev, NULL))
3a4b0a07 3854 rdev->regmap = dev_get_regmap(dev, NULL);
52b84dac
AC		 3855 else if (dev->parent)
3856 rdev->regmap = dev_get_regmap(dev->parent, NULL);
414c70cb 3857 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 3858 INIT_LIST_HEAD(&rdev->list);
414c70cb 3859 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 3860 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 3861
a5766f11 3862 /* preform any regulator specific init */
9a8f5e07 3863 if (init_data && init_data->regulator_init) {
a5766f11 3864 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 3865 if (ret < 0)
3866 goto clean;
a5766f11
LG		 3867 }
3868
a5766f11 3869 /* register with sysfs */
414c70cb 3870 rdev->dev.class = &regulator_class;
a5766f11 3871 rdev->dev.parent = dev;
72dca06f 3872 dev_set_name(&rdev->dev, "regulator.%lu",
39138818 3873 (unsigned long) atomic_inc_return(&regulator_no));
a5766f11 3874 ret = device_register(&rdev->dev);
ad7725cb
VK		 3875 if (ret != 0) {
3876 put_device(&rdev->dev);
4fca9545 3877 goto clean;
ad7725cb 3878 }
a5766f11
LG		 3879
3880 dev_set_drvdata(&rdev->dev, rdev);
3881
76f439df
MP		 3882 if ((config->ena_gpio || config->ena_gpio_initialized) &&
3883 gpio_is_valid(config->ena_gpio)) {
f19b00da 3884 ret = regulator_ena_gpio_request(rdev, config);
65f73508
MB		 3885 if (ret != 0) {
3886 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3887 config->ena_gpio, ret);
b2da55d9 3888 goto wash;
65f73508 3889 }
65f73508
MB		 3890 }
3891
74f544c1 3892 /* set regulator constraints */
9a8f5e07
MB		 3893 if (init_data)
3894 constraints = &init_data->constraints;
3895
3896 ret = set_machine_constraints(rdev, constraints);
74f544c1
MR		 3897 if (ret < 0)
3898 goto scrub;
3899
9a8f5e07 3900 if (init_data && init_data->supply_regulator)
6261b06d 3901 rdev->supply_name = init_data->supply_regulator;
69511a45 3902 else if (regulator_desc->supply_name)
6261b06d 3903 rdev->supply_name = regulator_desc->supply_name;
0178f3e2 3904
a5766f11 3905 /* add consumers devices */
9a8f5e07
MB		 3906 if (init_data) {
3907 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3908 ret = set_consumer_device_supply(rdev,
9a8f5e07 3909 init_data->consumer_supplies[i].dev_name,
23c2f041 3910 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 3911 if (ret < 0) {
3912 dev_err(dev, "Failed to set supply %s\n",
3913 init_data->consumer_supplies[i].supply);
3914 goto unset_supplies;
3915 }
23c2f041 3916 }
414c70cb 3917 }
a5766f11
LG		 3918
3919 list_add(&rdev->list, &regulator_list);
1130e5b3
MB		 3920
3921 rdev_init_debugfs(rdev);
a5766f11 3922out:
414c70cb 3923 mutex_unlock(&regulator_list_mutex);
1b3de223 3924 kfree(config);
414c70cb 3925 return rdev;
4fca9545 3926
d4033b54
JN		 3927unset_supplies:
3928 unset_regulator_supplies(rdev);
3929
4fca9545 3930scrub:
f19b00da 3931 regulator_ena_gpio_free(rdev);
1a6958e7 3932 kfree(rdev->constraints);
b2da55d9 3933wash:
4fca9545 3934 device_unregister(&rdev->dev);
53032daf
PW		 3935 /* device core frees rdev */
3936 rdev = ERR_PTR(ret);
3937 goto out;
3938
4fca9545
DB		 3939clean:
3940 kfree(rdev);
3941 rdev = ERR_PTR(ret);
3942 goto out;
414c70cb
LG		 3943}
3944EXPORT_SYMBOL_GPL(regulator_register);
3945
3946/**
3947 * regulator_unregister - unregister regulator
69279fb9 3948 * @rdev: regulator to unregister
414c70cb
LG		 3949 *
3950 * Called by regulator drivers to unregister a regulator.
3951 */
3952void regulator_unregister(struct regulator_dev *rdev)
3953{
3954 if (rdev == NULL)
3955 return;
3956
891636ea
MB		 3957 if (rdev->supply) {
3958 while (rdev->use_count--)
3959 regulator_disable(rdev->supply);
e032b376 3960 regulator_put(rdev->supply);
891636ea 3961 }
414c70cb 3962 mutex_lock(&regulator_list_mutex);
1130e5b3 3963 debugfs_remove_recursive(rdev->debugfs);
43829731 3964 flush_work(&rdev->disable_work.work);
6bf87d17 3965 WARN_ON(rdev->open_count);
0f1d747b 3966 unset_regulator_supplies(rdev);
414c70cb 3967 list_del(&rdev->list);
7cd71c3b 3968 mutex_unlock(&regulator_list_mutex);
f19b00da 3969 regulator_ena_gpio_free(rdev);
58fb5cf5 3970 device_unregister(&rdev->dev);
414c70cb
LG		 3971}
3972EXPORT_SYMBOL_GPL(regulator_unregister);
3973
414c70cb 3974/**
cf7bbcdf 3975 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 3976 * @state: system suspend state
3977 *
3978 * Configure each regulator with it's suspend operating parameters for state.
3979 * This will usually be called by machine suspend code prior to supending.
3980 */
3981int regulator_suspend_prepare(suspend_state_t state)
3982{
3983 struct regulator_dev *rdev;
3984 int ret = 0;
3985
3986 /* ON is handled by regulator active state */
3987 if (state == PM_SUSPEND_ON)
3988 return -EINVAL;
3989
3990 mutex_lock(&regulator_list_mutex);
3991 list_for_each_entry(rdev, &regulator_list, list) {
3992
3993 mutex_lock(&rdev->mutex);
3994 ret = suspend_prepare(rdev, state);
3995 mutex_unlock(&rdev->mutex);
3996
3997 if (ret < 0) {
5da84fd9 3998 rdev_err(rdev, "failed to prepare\n");
414c70cb
LG		 3999 goto out;
4000 }
4001 }
4002out:
4003 mutex_unlock(&regulator_list_mutex);
4004 return ret;
4005}
4006EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
4007
7a32b589
MH		 4008/**
4009 * regulator_suspend_finish - resume regulators from system wide suspend
4010 *
4011 * Turn on regulators that might be turned off by regulator_suspend_prepare
4012 * and that should be turned on according to the regulators properties.
4013 */
4014int regulator_suspend_finish(void)
4015{
4016 struct regulator_dev *rdev;
4017 int ret = 0, error;
4018
4019 mutex_lock(&regulator_list_mutex);
4020 list_for_each_entry(rdev, &regulator_list, list) {
7a32b589 4021 mutex_lock(&rdev->mutex);
30c21971 4022 if (rdev->use_count > 0 || rdev->constraints->always_on) {
0548bf4f
JMC		 4023 if (!_regulator_is_enabled(rdev)) {
4024 error = _regulator_do_enable(rdev);
4025 if (error)
4026 ret = error;
4027 }
7a32b589 4028 } else {
87b28417 4029 if (!have_full_constraints())
7a32b589 4030 goto unlock;
b1a86831 4031 if (!_regulator_is_enabled(rdev))
7a32b589
MH		 4032 goto unlock;
4033
66fda75f 4034 error = _regulator_do_disable(rdev);
7a32b589
MH		 4035 if (error)
4036 ret = error;
4037 }
4038unlock:
4039 mutex_unlock(&rdev->mutex);
4040 }
4041 mutex_unlock(&regulator_list_mutex);
4042 return ret;
4043}
4044EXPORT_SYMBOL_GPL(regulator_suspend_finish);
4045
ca725561
MB		 4046/**
4047 * regulator_has_full_constraints - the system has fully specified constraints
4048 *
4049 * Calling this function will cause the regulator API to disable all
4050 * regulators which have a zero use count and don't have an always_on
4051 * constraint in a late_initcall.
4052 *
4053 * The intention is that this will become the default behaviour in a
4054 * future kernel release so users are encouraged to use this facility
4055 * now.
4056 */
4057void regulator_has_full_constraints(void)
4058{
4059 has_full_constraints = 1;
4060}
4061EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4062
414c70cb
LG		 4063/**
4064 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 4065 * @rdev: regulator
414c70cb
LG		 4066 *
4067 * Get rdev regulator driver private data. This call can be used in the
4068 * regulator driver context.
4069 */
4070void *rdev_get_drvdata(struct regulator_dev *rdev)
4071{
4072 return rdev->reg_data;
4073}
4074EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4075
4076/**
4077 * regulator_get_drvdata - get regulator driver data
4078 * @regulator: regulator
4079 *
4080 * Get regulator driver private data. This call can be used in the consumer
4081 * driver context when non API regulator specific functions need to be called.
4082 */
4083void *regulator_get_drvdata(struct regulator *regulator)
4084{
4085 return regulator->rdev->reg_data;
4086}
4087EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4088
4089/**
4090 * regulator_set_drvdata - set regulator driver data
4091 * @regulator: regulator
4092 * @data: data
4093 */
4094void regulator_set_drvdata(struct regulator *regulator, void *data)
4095{
4096 regulator->rdev->reg_data = data;
4097}
4098EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4099
4100/**
4101 * regulator_get_id - get regulator ID
69279fb9 4102 * @rdev: regulator
414c70cb
LG		 4103 */
4104int rdev_get_id(struct regulator_dev *rdev)
4105{
4106 return rdev->desc->id;
4107}
4108EXPORT_SYMBOL_GPL(rdev_get_id);
4109
a5766f11
LG		 4110struct device *rdev_get_dev(struct regulator_dev *rdev)
4111{
4112 return &rdev->dev;
4113}
4114EXPORT_SYMBOL_GPL(rdev_get_dev);
4115
4116void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4117{
4118 return reg_init_data->driver_data;
4119}
4120EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4121
ba55a974
MB		 4122#ifdef CONFIG_DEBUG_FS
4123static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
4124 size_t count, loff_t *ppos)
4125{
4126 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
4127 ssize_t len, ret = 0;
4128 struct regulator_map *map;
4129
4130 if (!buf)
4131 return -ENOMEM;
4132
4133 list_for_each_entry(map, &regulator_map_list, list) {
4134 len = snprintf(buf + ret, PAGE_SIZE - ret,
4135 "%s -> %s.%s\n",
4136 rdev_get_name(map->regulator), map->dev_name,
4137 map->supply);
4138 if (len >= 0)
4139 ret += len;
4140 if (ret > PAGE_SIZE) {
4141 ret = PAGE_SIZE;
4142 break;
4143 }
4144 }
4145
4146 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
4147
4148 kfree(buf);
4149
4150 return ret;
4151}
24751434 4152#endif
ba55a974
MB		 4153
4154static const struct file_operations supply_map_fops = {
24751434 4155#ifdef CONFIG_DEBUG_FS
ba55a974
MB		 4156 .read = supply_map_read_file,
4157 .llseek = default_llseek,
ba55a974 4158#endif
24751434 4159};
ba55a974 4160
7c225ec9
HS		 4161#ifdef CONFIG_DEBUG_FS
4162static void regulator_summary_show_subtree(struct seq_file *s,
4163 struct regulator_dev *rdev,
4164 int level)
4165{
4166 struct list_head *list = s->private;
4167 struct regulator_dev *child;
4168 struct regulation_constraints *c;
4169 struct regulator *consumer;
4170
4171 if (!rdev)
4172 return;
4173
7c225ec9
HS		 4174 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4175 level * 3 + 1, "",
4176 30 - level * 3, rdev_get_name(rdev),
4177 rdev->use_count, rdev->open_count, rdev->bypass_count);
4178
23296099
HS		 4179 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4180 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
7c225ec9
HS		 4181
4182 c = rdev->constraints;
4183 if (c) {
4184 switch (rdev->desc->type) {
4185 case REGULATOR_VOLTAGE:
4186 seq_printf(s, "%5dmV %5dmV ",
4187 c->min_uV / 1000, c->max_uV / 1000);
4188 break;
4189 case REGULATOR_CURRENT:
4190 seq_printf(s, "%5dmA %5dmA ",
4191 c->min_uA / 1000, c->max_uA / 1000);
4192 break;
4193 }
4194 }
4195
4196 seq_puts(s, "\n");
4197
4198 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4199 if (consumer->dev->class == &regulator_class)
4200 continue;
4201
4202 seq_printf(s, "%*s%-*s ",
4203 (level + 1) * 3 + 1, "",
4204 30 - (level + 1) * 3, dev_name(consumer->dev));
4205
4206 switch (rdev->desc->type) {
4207 case REGULATOR_VOLTAGE:
23296099 4208 seq_printf(s, "%37dmV %5dmV",
7c225ec9
HS		 4209 consumer->min_uV / 1000,
4210 consumer->max_uV / 1000);
4211 break;
4212 case REGULATOR_CURRENT:
7c225ec9
HS		 4213 break;
4214 }
4215
4216 seq_puts(s, "\n");
4217 }
4218
7c225ec9
HS		 4219 list_for_each_entry(child, list, list) {
4220 /* handle only non-root regulators supplied by current rdev */
4221 if (!child->supply || child->supply->rdev != rdev)
4222 continue;
4223
4224 regulator_summary_show_subtree(s, child, level + 1);
4225 }
4226}
4227
4228static int regulator_summary_show(struct seq_file *s, void *data)
4229{
4230 struct list_head *list = s->private;
4231 struct regulator_dev *rdev;
4232
23296099
HS		 4233 seq_puts(s, " regulator use open bypass voltage current min max\n");
4234 seq_puts(s, "-------------------------------------------------------------------------------\n");
7c225ec9
HS		 4235
4236 mutex_lock(&regulator_list_mutex);
4237
4238 list_for_each_entry(rdev, list, list) {
4239 if (rdev->supply)
4240 continue;
4241
4242 regulator_summary_show_subtree(s, rdev, 0);
4243 }
4244
4245 mutex_unlock(&regulator_list_mutex);
4246
4247 return 0;
4248}
4249
4250static int regulator_summary_open(struct inode *inode, struct file *file)
4251{
4252 return single_open(file, regulator_summary_show, inode->i_private);
4253}
4254#endif
4255
4256static const struct file_operations regulator_summary_fops = {
4257#ifdef CONFIG_DEBUG_FS
4258 .open = regulator_summary_open,
4259 .read = seq_read,
4260 .llseek = seq_lseek,
4261 .release = single_release,
4262#endif
4263};
4264
414c70cb
LG		 4265static int __init regulator_init(void)
4266{
34abbd68
MB		 4267 int ret;
4268
34abbd68
MB		 4269 ret = class_register(&regulator_class);
4270
1130e5b3 4271 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 4272 if (!debugfs_root)
1130e5b3 4273 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 4274
f4d562c6
MB		 4275 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4276 &supply_map_fops);
1130e5b3 4277
7c225ec9
HS		 4278 debugfs_create_file("regulator_summary", 0444, debugfs_root,
4279 &regulator_list, &regulator_summary_fops);
4280
34abbd68
MB		 4281 regulator_dummy_init();
4282
4283 return ret;
414c70cb
LG		 4284}
4285
4286/* init early to allow our consumers to complete system booting */
4287core_initcall(regulator_init);
ca725561 4288
609ca5f3 4289static int __init regulator_late_cleanup(struct device *dev, void *data)
ca725561 4290{
609ca5f3
MB		 4291 struct regulator_dev *rdev = dev_to_rdev(dev);
4292 const struct regulator_ops *ops = rdev->desc->ops;
4293 struct regulation_constraints *c = rdev->constraints;
ca725561 4294 int enabled, ret;
ca725561 4295
609ca5f3
MB		 4296 if (c && c->always_on)
4297 return 0;
4298
4299 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
4300 return 0;
4301
4302 mutex_lock(&rdev->mutex);
4303
4304 if (rdev->use_count)
4305 goto unlock;
4306
4307 /* If we can't read the status assume it's on. */
4308 if (ops->is_enabled)
4309 enabled = ops->is_enabled(rdev);
4310 else
4311 enabled = 1;
4312
4313 if (!enabled)
4314 goto unlock;
4315
4316 if (have_full_constraints()) {
4317 /* We log since this may kill the system if it goes
4318 * wrong. */
4319 rdev_info(rdev, "disabling\n");
4320 ret = _regulator_do_disable(rdev);
4321 if (ret != 0)
4322 rdev_err(rdev, "couldn't disable: %d\n", ret);
4323 } else {
4324 /* The intention is that in future we will
4325 * assume that full constraints are provided
4326 * so warn even if we aren't going to do
4327 * anything here.
4328 */
4329 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4330 }
4331
4332unlock:
4333 mutex_unlock(&rdev->mutex);
4334
4335 return 0;
4336}
4337
4338static int __init regulator_init_complete(void)
4339{
86f5fcfc
MB		 4340 /*
4341 * Since DT doesn't provide an idiomatic mechanism for
4342 * enabling full constraints and since it's much more natural
4343 * with DT to provide them just assume that a DT enabled
4344 * system has full constraints.
4345 */
4346 if (of_have_populated_dt())
4347 has_full_constraints = true;
4348
ca725561 4349 /* If we have a full configuration then disable any regulators
e9535834
MB		 4350 * we have permission to change the status for and which are
4351 * not in use or always_on. This is effectively the default
4352 * for DT and ACPI as they have full constraints.
ca725561 4353 */
609ca5f3
MB		 4354 class_for_each_device(&regulator_class, NULL, NULL,
4355 regulator_late_cleanup);
ca725561
MB		 4356
4357 return 0;
4358}
fd482a3e 4359late_initcall_sync(regulator_init_complete);
Linux kernel - Deliverables
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