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regulator: dummy: Use devm_regulator_register()
[linux-2.6-block.git] / drivers / regulator / core.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
f2c6203f
MB		 2//
3// core.c -- Voltage/Current Regulator framework.
4//
5// Copyright 2007, 2008 Wolfson Microelectronics PLC.
6// Copyright 2008 SlimLogic Ltd.
7//
8// Author: Liam Girdwood <lrg@slimlogic.co.uk>
414c70cb
LG		 9
10#include <linux/kernel.h>
11#include <linux/init.h>
1130e5b3 12#include <linux/debugfs.h>
414c70cb 13#include <linux/device.h>
5a0e3ad6 14#include <linux/slab.h>
f21e0e81 15#include <linux/async.h>
414c70cb
LG		 16#include <linux/err.h>
17#include <linux/mutex.h>
18#include <linux/suspend.h>
31aae2be 19#include <linux/delay.h>
778b28b4 20#include <linux/gpio/consumer.h>
69511a45 21#include <linux/of.h>
65b19ce6 22#include <linux/regmap.h>
69511a45 23#include <linux/regulator/of_regulator.h>
414c70cb 24#include <linux/regulator/consumer.h>
d8ca7d18 25#include <linux/regulator/coupler.h>
414c70cb
LG		 26#include <linux/regulator/driver.h>
27#include <linux/regulator/machine.h>
65602c32 28#include <linux/module.h>
414c70cb 29
02fa3ec0
MB		 30#define CREATE_TRACE_POINTS
31#include <trace/events/regulator.h>
32
34abbd68 33#include "dummy.h"
0cdfcc0f 34#include "internal.h"
34abbd68 35
f8702f9e
DO		 36static DEFINE_WW_CLASS(regulator_ww_class);
37static DEFINE_MUTEX(regulator_nesting_mutex);
414c70cb 38static DEFINE_MUTEX(regulator_list_mutex);
414c70cb 39static LIST_HEAD(regulator_map_list);
f19b00da 40static LIST_HEAD(regulator_ena_gpio_list);
a06ccd9c 41static LIST_HEAD(regulator_supply_alias_list);
d8ca7d18 42static LIST_HEAD(regulator_coupler_list);
21cf891a 43static bool has_full_constraints;
414c70cb 44
1130e5b3 45static struct dentry *debugfs_root;
1130e5b3 46
8dc5390d 47/*
414c70cb
LG		 48 * struct regulator_map
49 *
50 * Used to provide symbolic supply names to devices.
51 */
52struct regulator_map {
53 struct list_head list;
40f9244f 54 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 55 const char *supply;
a5766f11 56 struct regulator_dev *regulator;
414c70cb
LG		 57};
58
f19b00da
KM		 59/*
60 * struct regulator_enable_gpio
61 *
62 * Management for shared enable GPIO pin
63 */
64struct regulator_enable_gpio {
65 struct list_head list;
778b28b4 66 struct gpio_desc *gpiod;
f19b00da
KM		 67 u32 enable_count; /* a number of enabled shared GPIO */
68 u32 request_count; /* a number of requested shared GPIO */
f19b00da
KM		 69};
70
a06ccd9c
CK		 71/*
72 * struct regulator_supply_alias
73 *
74 * Used to map lookups for a supply onto an alternative device.
75 */
76struct regulator_supply_alias {
77 struct list_head list;
78 struct device *src_dev;
79 const char *src_supply;
80 struct device *alias_dev;
81 const char *alias_supply;
82};
83
414c70cb 84static int _regulator_is_enabled(struct regulator_dev *rdev);
5451781d 85static int _regulator_disable(struct regulator *regulator);
414c70cb
LG		 86static int _regulator_get_current_limit(struct regulator_dev *rdev);
87static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
7179569a 88static int _notifier_call_chain(struct regulator_dev *rdev,
414c70cb 89 unsigned long event, void *data);
75790251
MB		 90static int _regulator_do_set_voltage(struct regulator_dev *rdev,
91 int min_uV, int max_uV);
c054c6c7
MP		 92static int regulator_balance_voltage(struct regulator_dev *rdev,
93 suspend_state_t state);
3801b86a
MB		 94static struct regulator *create_regulator(struct regulator_dev *rdev,
95 struct device *dev,
96 const char *supply_name);
e1794aa4 97static void destroy_regulator(struct regulator *regulator);
36a1f1b6 98static void _regulator_put(struct regulator *regulator);
414c70cb 99
d22b85a1 100const char *rdev_get_name(struct regulator_dev *rdev)
1083c393
MB		 101{
102 if (rdev->constraints && rdev->constraints->name)
103 return rdev->constraints->name;
104 else if (rdev->desc->name)
105 return rdev->desc->name;
106 else
107 return "";
108}
157d2230 109EXPORT_SYMBOL_GPL(rdev_get_name);
1083c393 110
87b28417
MB		 111static bool have_full_constraints(void)
112{
75bc9641 113 return has_full_constraints || of_have_populated_dt();
87b28417
MB		 114}
115
8a34e979
WP		 116static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops)
117{
118 if (!rdev->constraints) {
119 rdev_err(rdev, "no constraints\n");
120 return false;
121 }
122
123 if (rdev->constraints->valid_ops_mask & ops)
124 return true;
125
126 return false;
127}
128
66cf9a7e
MP		 129/**
130 * regulator_lock_nested - lock a single regulator
131 * @rdev: regulator source
f8702f9e 132 * @ww_ctx: w/w mutex acquire context
66cf9a7e
MP		 133 *
134 * This function can be called many times by one task on
135 * a single regulator and its mutex will be locked only
136 * once. If a task, which is calling this function is other
137 * than the one, which initially locked the mutex, it will
138 * wait on mutex.
139 */
f8702f9e
DO		 140static inline int regulator_lock_nested(struct regulator_dev *rdev,
141 struct ww_acquire_ctx *ww_ctx)
66cf9a7e 142{
f8702f9e
DO		 143 bool lock = false;
144 int ret = 0;
145
146 mutex_lock(&regulator_nesting_mutex);
147
148 if (ww_ctx || !ww_mutex_trylock(&rdev->mutex)) {
149 if (rdev->mutex_owner == current)
66cf9a7e 150 rdev->ref_cnt++;
f8702f9e
DO		 151 else
152 lock = true;
153
154 if (lock) {
155 mutex_unlock(&regulator_nesting_mutex);
156 ret = ww_mutex_lock(&rdev->mutex, ww_ctx);
157 mutex_lock(&regulator_nesting_mutex);
66cf9a7e 158 }
f8702f9e
DO		 159 } else {
160 lock = true;
66cf9a7e
MP		 161 }
162
f8702f9e
DO		 163 if (lock && ret != -EDEADLK) {
164 rdev->ref_cnt++;
165 rdev->mutex_owner = current;
166 }
167
168 mutex_unlock(&regulator_nesting_mutex);
169
170 return ret;
66cf9a7e
MP		 171}
172
f8702f9e
DO		 173/**
174 * regulator_lock - lock a single regulator
175 * @rdev: regulator source
176 *
177 * This function can be called many times by one task on
178 * a single regulator and its mutex will be locked only
179 * once. If a task, which is calling this function is other
180 * than the one, which initially locked the mutex, it will
181 * wait on mutex.
182 */
4c9db393 183static void regulator_lock(struct regulator_dev *rdev)
66cf9a7e 184{
f8702f9e 185 regulator_lock_nested(rdev, NULL);
66cf9a7e
MP		 186}
187
188/**
189 * regulator_unlock - unlock a single regulator
190 * @rdev: regulator_source
191 *
192 * This function unlocks the mutex when the
193 * reference counter reaches 0.
194 */
4c9db393 195static void regulator_unlock(struct regulator_dev *rdev)
66cf9a7e 196{
f8702f9e 197 mutex_lock(&regulator_nesting_mutex);
66cf9a7e 198
f8702f9e
DO		 199 if (--rdev->ref_cnt == 0) {
200 rdev->mutex_owner = NULL;
201 ww_mutex_unlock(&rdev->mutex);
66cf9a7e 202 }
f8702f9e
DO		 203
204 WARN_ON_ONCE(rdev->ref_cnt < 0);
205
206 mutex_unlock(&regulator_nesting_mutex);
66cf9a7e
MP		 207}
208
089e2cc2 209static bool regulator_supply_is_couple(struct regulator_dev *rdev)
66cf9a7e 210{
089e2cc2
DO		 211 struct regulator_dev *c_rdev;
212 int i;
213
214 for (i = 1; i < rdev->coupling_desc.n_coupled; i++) {
215 c_rdev = rdev->coupling_desc.coupled_rdevs[i];
66cf9a7e 216
089e2cc2
DO		 217 if (rdev->supply->rdev == c_rdev)
218 return true;
219 }
220
221 return false;
222}
223
f8702f9e
DO		 224static void regulator_unlock_recursive(struct regulator_dev *rdev,
225 unsigned int n_coupled)
9f01cd4a 226{
0a7416f9
DO		 227 struct regulator_dev *c_rdev, *supply_rdev;
228 int i, supply_n_coupled;
9f01cd4a 229
f8702f9e
DO		 230 for (i = n_coupled; i > 0; i--) {
231 c_rdev = rdev->coupling_desc.coupled_rdevs[i - 1];
9243a195
MP		 232
233 if (!c_rdev)
234 continue;
235
0a7416f9
DO		 236 if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) {
237 supply_rdev = c_rdev->supply->rdev;
238 supply_n_coupled = supply_rdev->coupling_desc.n_coupled;
239
240 regulator_unlock_recursive(supply_rdev,
241 supply_n_coupled);
242 }
9243a195 243
f8702f9e
DO		 244 regulator_unlock(c_rdev);
245 }
9f01cd4a
SH		 246}
247
f8702f9e
DO		 248static int regulator_lock_recursive(struct regulator_dev *rdev,
249 struct regulator_dev **new_contended_rdev,
250 struct regulator_dev **old_contended_rdev,
251 struct ww_acquire_ctx *ww_ctx)
9f01cd4a 252{
9243a195 253 struct regulator_dev *c_rdev;
f8702f9e 254 int i, err;
9f01cd4a 255
9243a195
MP		 256 for (i = 0; i < rdev->coupling_desc.n_coupled; i++) {
257 c_rdev = rdev->coupling_desc.coupled_rdevs[i];
456e7cdf 258
9243a195
MP		 259 if (!c_rdev)
260 continue;
9f01cd4a 261
f8702f9e
DO		 262 if (c_rdev != *old_contended_rdev) {
263 err = regulator_lock_nested(c_rdev, ww_ctx);
264 if (err) {
265 if (err == -EDEADLK) {
266 *new_contended_rdev = c_rdev;
267 goto err_unlock;
268 }
9243a195 269
f8702f9e
DO		 270 /* shouldn't happen */
271 WARN_ON_ONCE(err != -EALREADY);
272 }
273 } else {
274 *old_contended_rdev = NULL;
275 }
276
089e2cc2 277 if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) {
f8702f9e
DO		 278 err = regulator_lock_recursive(c_rdev->supply->rdev,
279 new_contended_rdev,
280 old_contended_rdev,
281 ww_ctx);
282 if (err) {
283 regulator_unlock(c_rdev);
284 goto err_unlock;
285 }
66cf9a7e
MP		 286 }
287 }
f8702f9e
DO		 288
289 return 0;
290
291err_unlock:
292 regulator_unlock_recursive(rdev, i);
293
294 return err;
66cf9a7e
MP		 295}
296
38de19fa 297/**
f8702f9e
DO		 298 * regulator_unlock_dependent - unlock regulator's suppliers and coupled
299 * regulators
300 * @rdev: regulator source
301 * @ww_ctx: w/w mutex acquire context
302 *
48f1b4ef 303 * Unlock all regulators related with rdev by coupling or supplying.
38de19fa 304 */
f8702f9e
DO		 305static void regulator_unlock_dependent(struct regulator_dev *rdev,
306 struct ww_acquire_ctx *ww_ctx)
9f01cd4a 307{
f8702f9e
DO		 308 regulator_unlock_recursive(rdev, rdev->coupling_desc.n_coupled);
309 ww_acquire_fini(ww_ctx);
9f01cd4a
SH		 310}
311
312/**
9243a195
MP		 313 * regulator_lock_dependent - lock regulator's suppliers and coupled regulators
314 * @rdev: regulator source
f8702f9e 315 * @ww_ctx: w/w mutex acquire context
9243a195
MP		 316 *
317 * This function as a wrapper on regulator_lock_recursive(), which locks
48f1b4ef 318 * all regulators related with rdev by coupling or supplying.
9f01cd4a 319 */
f8702f9e
DO		 320static void regulator_lock_dependent(struct regulator_dev *rdev,
321 struct ww_acquire_ctx *ww_ctx)
9f01cd4a 322{
f8702f9e
DO		 323 struct regulator_dev *new_contended_rdev = NULL;
324 struct regulator_dev *old_contended_rdev = NULL;
325 int err;
9f01cd4a 326
f8702f9e 327 mutex_lock(&regulator_list_mutex);
456e7cdf 328
f8702f9e 329 ww_acquire_init(ww_ctx, &regulator_ww_class);
9f01cd4a 330
f8702f9e
DO		 331 do {
332 if (new_contended_rdev) {
333 ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx);
334 old_contended_rdev = new_contended_rdev;
335 old_contended_rdev->ref_cnt++;
336 }
337
338 err = regulator_lock_recursive(rdev,
339 &new_contended_rdev,
340 &old_contended_rdev,
341 ww_ctx);
342
343 if (old_contended_rdev)
344 regulator_unlock(old_contended_rdev);
345
346 } while (err == -EDEADLK);
347
348 ww_acquire_done(ww_ctx);
349
350 mutex_unlock(&regulator_list_mutex);
9f01cd4a
SH		 351}
352
fe06051d 353/**
354 * of_get_child_regulator - get a child regulator device node
355 * based on supply name
356 * @parent: Parent device node
357 * @prop_name: Combination regulator supply name and "-supply"
358 *
359 * Traverse all child nodes.
360 * Extract the child regulator device node corresponding to the supply name.
361 * returns the device node corresponding to the regulator if found, else
362 * returns NULL.
363 */
364static struct device_node *of_get_child_regulator(struct device_node *parent,
365 const char *prop_name)
366{
367 struct device_node *regnode = NULL;
368 struct device_node *child = NULL;
369
370 for_each_child_of_node(parent, child) {
371 regnode = of_parse_phandle(child, prop_name, 0);
372
373 if (!regnode) {
374 regnode = of_get_child_regulator(child, prop_name);
81eeb0a3
ND		 375 if (regnode)
376 goto err_node_put;
fe06051d 377 } else {
81eeb0a3 378 goto err_node_put;
fe06051d 379 }
380 }
381 return NULL;
81eeb0a3
ND		 382
383err_node_put:
384 of_node_put(child);
385 return regnode;
fe06051d 386}
387
69511a45
RN		 388/**
389 * of_get_regulator - get a regulator device node based on supply name
390 * @dev: Device pointer for the consumer (of regulator) device
391 * @supply: regulator supply name
392 *
393 * Extract the regulator device node corresponding to the supply name.
167d41dc 394 * returns the device node corresponding to the regulator if found, else
69511a45
RN		 395 * returns NULL.
396 */
397static struct device_node *of_get_regulator(struct device *dev, const char *supply)
398{
399 struct device_node *regnode = NULL;
e9bb4a06 400 char prop_name[64]; /* 64 is max size of property name */
69511a45
RN		 401
402 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
403
e9bb4a06 404 snprintf(prop_name, 64, "%s-supply", supply);
69511a45
RN		 405 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
406
407 if (!regnode) {
fe06051d 408 regnode = of_get_child_regulator(dev->of_node, prop_name);
409 if (regnode)
410 return regnode;
411
7799167b
RH		 412 dev_dbg(dev, "Looking up %s property in node %pOF failed\n",
413 prop_name, dev->of_node);
69511a45
RN		 414 return NULL;
415 }
416 return regnode;
417}
418
414c70cb 419/* Platform voltage constraint check */
d22b85a1
DO		 420int regulator_check_voltage(struct regulator_dev *rdev,
421 int *min_uV, int *max_uV)
414c70cb
LG		 422{
423 BUG_ON(*min_uV > *max_uV);
424
8a34e979 425 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
7ebcf26c 426 rdev_err(rdev, "voltage operation not allowed\n");
414c70cb
LG		 427 return -EPERM;
428 }
429
430 if (*max_uV > rdev->constraints->max_uV)
431 *max_uV = rdev->constraints->max_uV;
432 if (*min_uV < rdev->constraints->min_uV)
433 *min_uV = rdev->constraints->min_uV;
434
89f425ed
MB		 435 if (*min_uV > *max_uV) {
436 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 437 *min_uV, *max_uV);
414c70cb 438 return -EINVAL;
89f425ed 439 }
414c70cb
LG		 440
441 return 0;
442}
443
f7efad10
CZ		 444/* return 0 if the state is valid */
445static int regulator_check_states(suspend_state_t state)
446{
447 return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE);
448}
449
05fda3b1
TP		 450/* Make sure we select a voltage that suits the needs of all
451 * regulator consumers
452 */
d22b85a1
DO		 453int regulator_check_consumers(struct regulator_dev *rdev,
454 int *min_uV, int *max_uV,
455 suspend_state_t state)
05fda3b1
TP		 456{
457 struct regulator *regulator;
c360a6df 458 struct regulator_voltage *voltage;
05fda3b1
TP		 459
460 list_for_each_entry(regulator, &rdev->consumer_list, list) {
c360a6df 461 voltage = &regulator->voltage[state];
4aa922c0
MB		 462 /*
463 * Assume consumers that didn't say anything are OK
464 * with anything in the constraint range.
465 */
c360a6df 466 if (!voltage->min_uV && !voltage->max_uV)
4aa922c0
MB		 467 continue;
468
c360a6df
CZ		 469 if (*max_uV > voltage->max_uV)
470 *max_uV = voltage->max_uV;
471 if (*min_uV < voltage->min_uV)
472 *min_uV = voltage->min_uV;
05fda3b1
TP		 473 }
474
dd8004af 475 if (*min_uV > *max_uV) {
9c7b4e8a
RD		 476 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
477 *min_uV, *max_uV);
05fda3b1 478 return -EINVAL;
dd8004af 479 }
05fda3b1
TP		 480
481 return 0;
482}
483
414c70cb
LG		 484/* current constraint check */
485static int regulator_check_current_limit(struct regulator_dev *rdev,
486 int *min_uA, int *max_uA)
487{
488 BUG_ON(*min_uA > *max_uA);
489
8a34e979 490 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) {
7ebcf26c 491 rdev_err(rdev, "current operation not allowed\n");
414c70cb
LG		 492 return -EPERM;
493 }
494
495 if (*max_uA > rdev->constraints->max_uA)
496 *max_uA = rdev->constraints->max_uA;
497 if (*min_uA < rdev->constraints->min_uA)
498 *min_uA = rdev->constraints->min_uA;
499
89f425ed
MB		 500 if (*min_uA > *max_uA) {
501 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 502 *min_uA, *max_uA);
414c70cb 503 return -EINVAL;
89f425ed 504 }
414c70cb
LG		 505
506 return 0;
507}
508
509/* operating mode constraint check */
109c75af
CK		 510static int regulator_mode_constrain(struct regulator_dev *rdev,
511 unsigned int *mode)
414c70cb 512{
2c608234 513 switch (*mode) {
e573520b
DB		 514 case REGULATOR_MODE_FAST:
515 case REGULATOR_MODE_NORMAL:
516 case REGULATOR_MODE_IDLE:
517 case REGULATOR_MODE_STANDBY:
518 break;
519 default:
89f425ed 520 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 521 return -EINVAL;
522 }
523
8a34e979 524 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) {
7ebcf26c 525 rdev_err(rdev, "mode operation not allowed\n");
414c70cb
LG		 526 return -EPERM;
527 }
2c608234
MB		 528
529 /* The modes are bitmasks, the most power hungry modes having
530 * the lowest values. If the requested mode isn't supported
69b8821e
SK		 531 * try higher modes.
532 */
2c608234
MB		 533 while (*mode) {
534 if (rdev->constraints->valid_modes_mask & *mode)
535 return 0;
536 *mode /= 2;
414c70cb 537 }
2c608234
MB		 538
539 return -EINVAL;
414c70cb
LG		 540}
541
f7efad10
CZ		 542static inline struct regulator_state *
543regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state)
544{
545 if (rdev->constraints == NULL)
546 return NULL;
547
548 switch (state) {
549 case PM_SUSPEND_STANDBY:
550 return &rdev->constraints->state_standby;
551 case PM_SUSPEND_MEM:
552 return &rdev->constraints->state_mem;
553 case PM_SUSPEND_MAX:
554 return &rdev->constraints->state_disk;
555 default:
556 return NULL;
557 }
558}
559
0955f5be
SB		 560static const struct regulator_state *
561regulator_get_suspend_state_check(struct regulator_dev *rdev, suspend_state_t state)
562{
563 const struct regulator_state *rstate;
564
565 rstate = regulator_get_suspend_state(rdev, state);
566 if (rstate == NULL)
567 return NULL;
568
569 /* If we have no suspend mode configuration don't set anything;
570 * only warn if the driver implements set_suspend_voltage or
571 * set_suspend_mode callback.
572 */
573 if (rstate->enabled != ENABLE_IN_SUSPEND &&
574 rstate->enabled != DISABLE_IN_SUSPEND) {
575 if (rdev->desc->ops->set_suspend_voltage ||
576 rdev->desc->ops->set_suspend_mode)
577 rdev_warn(rdev, "No configuration\n");
578 return NULL;
579 }
580
581 return rstate;
582}
583
a277a262
Y		 584static ssize_t microvolts_show(struct device *dev,
585 struct device_attribute *attr, char *buf)
414c70cb 586{
a5766f11 587 struct regulator_dev *rdev = dev_get_drvdata(dev);
c82f27df 588 int uV;
414c70cb 589
66cf9a7e 590 regulator_lock(rdev);
c82f27df 591 uV = regulator_get_voltage_rdev(rdev);
66cf9a7e 592 regulator_unlock(rdev);
414c70cb 593
c82f27df
NS		 594 if (uV < 0)
595 return uV;
596 return sprintf(buf, "%d\n", uV);
414c70cb 597}
a277a262 598static DEVICE_ATTR_RO(microvolts);
414c70cb 599
a277a262
Y		 600static ssize_t microamps_show(struct device *dev,
601 struct device_attribute *attr, char *buf)
414c70cb 602{
a5766f11 603 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 604
605 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
606}
a277a262 607static DEVICE_ATTR_RO(microamps);
414c70cb 608
587cea27
GKH		 609static ssize_t name_show(struct device *dev, struct device_attribute *attr,
610 char *buf)
bc558a60
MB		 611{
612 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 613
1083c393 614 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60 615}
587cea27 616static DEVICE_ATTR_RO(name);
bc558a60 617
01de19d0 618static const char *regulator_opmode_to_str(int mode)
414c70cb 619{
414c70cb
LG		 620 switch (mode) {
621 case REGULATOR_MODE_FAST:
01de19d0 622 return "fast";
414c70cb 623 case REGULATOR_MODE_NORMAL:
01de19d0 624 return "normal";
414c70cb 625 case REGULATOR_MODE_IDLE:
01de19d0 626 return "idle";
414c70cb 627 case REGULATOR_MODE_STANDBY:
01de19d0 628 return "standby";
414c70cb 629 }
01de19d0
DA		 630 return "unknown";
631}
632
633static ssize_t regulator_print_opmode(char *buf, int mode)
634{
635 return sprintf(buf, "%s\n", regulator_opmode_to_str(mode));
414c70cb
LG		 636}
637
a277a262
Y		 638static ssize_t opmode_show(struct device *dev,
639 struct device_attribute *attr, char *buf)
414c70cb 640{
a5766f11 641 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 642
4fca9545
DB		 643 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
644}
a277a262 645static DEVICE_ATTR_RO(opmode);
4fca9545
DB		 646
647static ssize_t regulator_print_state(char *buf, int state)
648{
414c70cb
LG		 649 if (state > 0)
650 return sprintf(buf, "enabled\n");
651 else if (state == 0)
652 return sprintf(buf, "disabled\n");
653 else
654 return sprintf(buf, "unknown\n");
655}
656
a277a262
Y		 657static ssize_t state_show(struct device *dev,
658 struct device_attribute *attr, char *buf)
4fca9545
DB		 659{
660 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 661 ssize_t ret;
662
66cf9a7e 663 regulator_lock(rdev);
9332546f 664 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
66cf9a7e 665 regulator_unlock(rdev);
4fca9545 666
9332546f 667 return ret;
4fca9545 668}
a277a262 669static DEVICE_ATTR_RO(state);
4fca9545 670
a277a262
Y		 671static ssize_t status_show(struct device *dev,
672 struct device_attribute *attr, char *buf)
853116a1
DB		 673{
674 struct regulator_dev *rdev = dev_get_drvdata(dev);
675 int status;
676 char *label;
677
678 status = rdev->desc->ops->get_status(rdev);
679 if (status < 0)
680 return status;
681
682 switch (status) {
683 case REGULATOR_STATUS_OFF:
684 label = "off";
685 break;
686 case REGULATOR_STATUS_ON:
687 label = "on";
688 break;
689 case REGULATOR_STATUS_ERROR:
690 label = "error";
691 break;
692 case REGULATOR_STATUS_FAST:
693 label = "fast";
694 break;
695 case REGULATOR_STATUS_NORMAL:
696 label = "normal";
697 break;
698 case REGULATOR_STATUS_IDLE:
699 label = "idle";
700 break;
701 case REGULATOR_STATUS_STANDBY:
702 label = "standby";
703 break;
f59c8f9f
MB		 704 case REGULATOR_STATUS_BYPASS:
705 label = "bypass";
706 break;
1beaf762
KG		 707 case REGULATOR_STATUS_UNDEFINED:
708 label = "undefined";
709 break;
853116a1
DB		 710 default:
711 return -ERANGE;
712 }
713
714 return sprintf(buf, "%s\n", label);
715}
a277a262 716static DEVICE_ATTR_RO(status);
853116a1 717
a277a262
Y		 718static ssize_t min_microamps_show(struct device *dev,
719 struct device_attribute *attr, char *buf)
414c70cb 720{
a5766f11 721 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 722
723 if (!rdev->constraints)
724 return sprintf(buf, "constraint not defined\n");
725
726 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
727}
a277a262 728static DEVICE_ATTR_RO(min_microamps);
414c70cb 729
a277a262
Y		 730static ssize_t max_microamps_show(struct device *dev,
731 struct device_attribute *attr, char *buf)
414c70cb 732{
a5766f11 733 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 734
735 if (!rdev->constraints)
736 return sprintf(buf, "constraint not defined\n");
737
738 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
739}
a277a262 740static DEVICE_ATTR_RO(max_microamps);
414c70cb 741
a277a262
Y		 742static ssize_t min_microvolts_show(struct device *dev,
743 struct device_attribute *attr, char *buf)
414c70cb 744{
a5766f11 745 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 746
747 if (!rdev->constraints)
748 return sprintf(buf, "constraint not defined\n");
749
750 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
751}
a277a262 752static DEVICE_ATTR_RO(min_microvolts);
414c70cb 753
a277a262
Y		 754static ssize_t max_microvolts_show(struct device *dev,
755 struct device_attribute *attr, char *buf)
414c70cb 756{
a5766f11 757 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 758
759 if (!rdev->constraints)
760 return sprintf(buf, "constraint not defined\n");
761
762 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
763}
a277a262 764static DEVICE_ATTR_RO(max_microvolts);
414c70cb 765
a277a262
Y		 766static ssize_t requested_microamps_show(struct device *dev,
767 struct device_attribute *attr, char *buf)
414c70cb 768{
a5766f11 769 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 770 struct regulator *regulator;
771 int uA = 0;
772
66cf9a7e 773 regulator_lock(rdev);
5451781d
DA		 774 list_for_each_entry(regulator, &rdev->consumer_list, list) {
775 if (regulator->enable_count)
776 uA += regulator->uA_load;
777 }
66cf9a7e 778 regulator_unlock(rdev);
414c70cb
LG		 779 return sprintf(buf, "%d\n", uA);
780}
a277a262 781static DEVICE_ATTR_RO(requested_microamps);
414c70cb 782
587cea27
GKH		 783static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
784 char *buf)
414c70cb 785{
a5766f11 786 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 787 return sprintf(buf, "%d\n", rdev->use_count);
788}
587cea27 789static DEVICE_ATTR_RO(num_users);
414c70cb 790
587cea27
GKH		 791static ssize_t type_show(struct device *dev, struct device_attribute *attr,
792 char *buf)
414c70cb 793{
a5766f11 794 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 795
796 switch (rdev->desc->type) {
797 case REGULATOR_VOLTAGE:
798 return sprintf(buf, "voltage\n");
799 case REGULATOR_CURRENT:
800 return sprintf(buf, "current\n");
801 }
802 return sprintf(buf, "unknown\n");
803}
587cea27 804static DEVICE_ATTR_RO(type);
414c70cb 805
a277a262
Y		 806static ssize_t suspend_mem_microvolts_show(struct device *dev,
807 struct device_attribute *attr, char *buf)
414c70cb 808{
a5766f11 809 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 810
414c70cb
LG		 811 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
812}
a277a262 813static DEVICE_ATTR_RO(suspend_mem_microvolts);
414c70cb 814
a277a262
Y		 815static ssize_t suspend_disk_microvolts_show(struct device *dev,
816 struct device_attribute *attr, char *buf)
414c70cb 817{
a5766f11 818 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 819
414c70cb
LG		 820 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
821}
a277a262 822static DEVICE_ATTR_RO(suspend_disk_microvolts);
414c70cb 823
a277a262
Y		 824static ssize_t suspend_standby_microvolts_show(struct device *dev,
825 struct device_attribute *attr, char *buf)
414c70cb 826{
a5766f11 827 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 828
414c70cb
LG		 829 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
830}
a277a262 831static DEVICE_ATTR_RO(suspend_standby_microvolts);
414c70cb 832
a277a262
Y		 833static ssize_t suspend_mem_mode_show(struct device *dev,
834 struct device_attribute *attr, char *buf)
414c70cb 835{
a5766f11 836 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 837
4fca9545
DB		 838 return regulator_print_opmode(buf,
839 rdev->constraints->state_mem.mode);
414c70cb 840}
a277a262 841static DEVICE_ATTR_RO(suspend_mem_mode);
414c70cb 842
a277a262
Y		 843static ssize_t suspend_disk_mode_show(struct device *dev,
844 struct device_attribute *attr, char *buf)
414c70cb 845{
a5766f11 846 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 847
4fca9545
DB		 848 return regulator_print_opmode(buf,
849 rdev->constraints->state_disk.mode);
414c70cb 850}
a277a262 851static DEVICE_ATTR_RO(suspend_disk_mode);
414c70cb 852
a277a262
Y		 853static ssize_t suspend_standby_mode_show(struct device *dev,
854 struct device_attribute *attr, char *buf)
414c70cb 855{
a5766f11 856 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 857
4fca9545
DB		 858 return regulator_print_opmode(buf,
859 rdev->constraints->state_standby.mode);
414c70cb 860}
a277a262 861static DEVICE_ATTR_RO(suspend_standby_mode);
414c70cb 862
a277a262
Y		 863static ssize_t suspend_mem_state_show(struct device *dev,
864 struct device_attribute *attr, char *buf)
414c70cb 865{
a5766f11 866 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 867
4fca9545
DB		 868 return regulator_print_state(buf,
869 rdev->constraints->state_mem.enabled);
414c70cb 870}
a277a262 871static DEVICE_ATTR_RO(suspend_mem_state);
414c70cb 872
a277a262
Y		 873static ssize_t suspend_disk_state_show(struct device *dev,
874 struct device_attribute *attr, char *buf)
414c70cb 875{
a5766f11 876 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 877
4fca9545
DB		 878 return regulator_print_state(buf,
879 rdev->constraints->state_disk.enabled);
414c70cb 880}
a277a262 881static DEVICE_ATTR_RO(suspend_disk_state);
414c70cb 882
a277a262
Y		 883static ssize_t suspend_standby_state_show(struct device *dev,
884 struct device_attribute *attr, char *buf)
414c70cb 885{
a5766f11 886 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 887
4fca9545
DB		 888 return regulator_print_state(buf,
889 rdev->constraints->state_standby.enabled);
414c70cb 890}
a277a262 891static DEVICE_ATTR_RO(suspend_standby_state);
7ad68e2f 892
a277a262
Y		 893static ssize_t bypass_show(struct device *dev,
894 struct device_attribute *attr, char *buf)
f59c8f9f
MB		 895{
896 struct regulator_dev *rdev = dev_get_drvdata(dev);
897 const char *report;
898 bool bypass;
899 int ret;
900
901 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
902
903 if (ret != 0)
904 report = "unknown";
905 else if (bypass)
906 report = "enabled";
907 else
908 report = "disabled";
909
910 return sprintf(buf, "%s\n", report);
911}
a277a262 912static DEVICE_ATTR_RO(bypass);
bc558a60 913
414c70cb 914/* Calculate the new optimum regulator operating mode based on the new total
69b8821e
SK		 915 * consumer load. All locks held by caller
916 */
8460ef38 917static int drms_uA_update(struct regulator_dev *rdev)
414c70cb
LG		 918{
919 struct regulator *sibling;
920 int current_uA = 0, output_uV, input_uV, err;
921 unsigned int mode;
922
8460ef38
BA		 923 /*
924 * first check to see if we can set modes at all, otherwise just
925 * tell the consumer everything is OK.
926 */
74a569ee
MG		 927 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) {
928 rdev_dbg(rdev, "DRMS operation not allowed\n");
8460ef38 929 return 0;
74a569ee 930 }
8460ef38 931
8f4490e0
BA		 932 if (!rdev->desc->ops->get_optimum_mode &&
933 !rdev->desc->ops->set_load)
8460ef38
BA		 934 return 0;
935
8f4490e0
BA		 936 if (!rdev->desc->ops->set_mode &&
937 !rdev->desc->ops->set_load)
8460ef38 938 return -EINVAL;
414c70cb 939
414c70cb 940 /* calc total requested load */
5451781d
DA		 941 list_for_each_entry(sibling, &rdev->consumer_list, list) {
942 if (sibling->enable_count)
943 current_uA += sibling->uA_load;
944 }
414c70cb 945
22a10bca
SB		 946 current_uA += rdev->constraints->system_load;
947
8f4490e0
BA		 948 if (rdev->desc->ops->set_load) {
949 /* set the optimum mode for our new total regulator load */
950 err = rdev->desc->ops->set_load(rdev, current_uA);
951 if (err < 0)
61aab5ad
MM		 952 rdev_err(rdev, "failed to set load %d: %pe\n",
953 current_uA, ERR_PTR(err));
8f4490e0 954 } else {
57776617 955 /* get output voltage */
d22b85a1 956 output_uV = regulator_get_voltage_rdev(rdev);
57776617
JP		 957 if (output_uV <= 0) {
958 rdev_err(rdev, "invalid output voltage found\n");
959 return -EINVAL;
960 }
961
962 /* get input voltage */
963 input_uV = 0;
964 if (rdev->supply)
965 input_uV = regulator_get_voltage(rdev->supply);
966 if (input_uV <= 0)
967 input_uV = rdev->constraints->input_uV;
968 if (input_uV <= 0) {
969 rdev_err(rdev, "invalid input voltage found\n");
970 return -EINVAL;
971 }
972
8f4490e0
BA		 973 /* now get the optimum mode for our new total regulator load */
974 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
975 output_uV, current_uA);
976
977 /* check the new mode is allowed */
978 err = regulator_mode_constrain(rdev, &mode);
979 if (err < 0) {
61aab5ad
MM		 980 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV: %pe\n",
981 current_uA, input_uV, output_uV, ERR_PTR(err));
8f4490e0
BA		 982 return err;
983 }
414c70cb 984
8f4490e0
BA		 985 err = rdev->desc->ops->set_mode(rdev, mode);
986 if (err < 0)
61aab5ad
MM		 987 rdev_err(rdev, "failed to set optimum mode %x: %pe\n",
988 mode, ERR_PTR(err));
8460ef38
BA		 989 }
990
8460ef38 991 return err;
414c70cb
LG		 992}
993
0955f5be
SB		 994static int __suspend_set_state(struct regulator_dev *rdev,
995 const struct regulator_state *rstate)
414c70cb
LG		 996{
997 int ret = 0;
638f85c5 998
72069f99
CZ		 999 if (rstate->enabled == ENABLE_IN_SUSPEND &&
1000 rdev->desc->ops->set_suspend_enable)
414c70cb 1001 ret = rdev->desc->ops->set_suspend_enable(rdev);
72069f99
CZ		 1002 else if (rstate->enabled == DISABLE_IN_SUSPEND &&
1003 rdev->desc->ops->set_suspend_disable)
414c70cb 1004 ret = rdev->desc->ops->set_suspend_disable(rdev);
8ac0e95d
AL		 1005 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
1006 ret = 0;
1007
414c70cb 1008 if (ret < 0) {
61aab5ad 1009 rdev_err(rdev, "failed to enabled/disable: %pe\n", ERR_PTR(ret));
414c70cb
LG		 1010 return ret;
1011 }
1012
1013 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
1014 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
1015 if (ret < 0) {
61aab5ad 1016 rdev_err(rdev, "failed to set voltage: %pe\n", ERR_PTR(ret));
414c70cb
LG		 1017 return ret;
1018 }
1019 }
1020
1021 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
1022 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
1023 if (ret < 0) {
61aab5ad 1024 rdev_err(rdev, "failed to set mode: %pe\n", ERR_PTR(ret));
414c70cb
LG		 1025 return ret;
1026 }
1027 }
414c70cb 1028
f7efad10 1029 return ret;
414c70cb
LG		 1030}
1031
0955f5be
SB		 1032static int suspend_set_initial_state(struct regulator_dev *rdev)
1033{
1034 const struct regulator_state *rstate;
1035
1036 rstate = regulator_get_suspend_state_check(rdev,
1037 rdev->constraints->initial_state);
1038 if (!rstate)
1039 return 0;
1040
1041 return __suspend_set_state(rdev, rstate);
1042}
1043
c845f21a
GU		 1044#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
1045static void print_constraints_debug(struct regulator_dev *rdev)
414c70cb
LG		 1046{
1047 struct regulation_constraints *constraints = rdev->constraints;
a7068e39 1048 char buf[160] = "";
5751a99f 1049 size_t len = sizeof(buf) - 1;
8f031b48
MB		 1050 int count = 0;
1051 int ret;
414c70cb 1052
8f031b48 1053 if (constraints->min_uV && constraints->max_uV) {
414c70cb 1054 if (constraints->min_uV == constraints->max_uV)
5751a99f
SW		 1055 count += scnprintf(buf + count, len - count, "%d mV ",
1056 constraints->min_uV / 1000);
414c70cb 1057 else
5751a99f
SW		 1058 count += scnprintf(buf + count, len - count,
1059 "%d <--> %d mV ",
1060 constraints->min_uV / 1000,
1061 constraints->max_uV / 1000);
8f031b48
MB		 1062 }
1063
1064 if (!constraints->min_uV ||
1065 constraints->min_uV != constraints->max_uV) {
d22b85a1 1066 ret = regulator_get_voltage_rdev(rdev);
8f031b48 1067 if (ret > 0)
5751a99f
SW		 1068 count += scnprintf(buf + count, len - count,
1069 "at %d mV ", ret / 1000);
8f031b48
MB		 1070 }
1071
bf5892a8 1072 if (constraints->uV_offset)
5751a99f
SW		 1073 count += scnprintf(buf + count, len - count, "%dmV offset ",
1074 constraints->uV_offset / 1000);
bf5892a8 1075
8f031b48 1076 if (constraints->min_uA && constraints->max_uA) {
414c70cb 1077 if (constraints->min_uA == constraints->max_uA)
5751a99f
SW		 1078 count += scnprintf(buf + count, len - count, "%d mA ",
1079 constraints->min_uA / 1000);
414c70cb 1080 else
5751a99f
SW		 1081 count += scnprintf(buf + count, len - count,
1082 "%d <--> %d mA ",
1083 constraints->min_uA / 1000,
1084 constraints->max_uA / 1000);
8f031b48
MB		 1085 }
1086
1087 if (!constraints->min_uA ||
1088 constraints->min_uA != constraints->max_uA) {
1089 ret = _regulator_get_current_limit(rdev);
1090 if (ret > 0)
5751a99f
SW		 1091 count += scnprintf(buf + count, len - count,
1092 "at %d mA ", ret / 1000);
414c70cb 1093 }
8f031b48 1094
414c70cb 1095 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
5751a99f 1096 count += scnprintf(buf + count, len - count, "fast ");
414c70cb 1097 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
5751a99f 1098 count += scnprintf(buf + count, len - count, "normal ");
414c70cb 1099 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
5751a99f 1100 count += scnprintf(buf + count, len - count, "idle ");
414c70cb 1101 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
99ad5f6e 1102 count += scnprintf(buf + count, len - count, "standby ");
414c70cb 1103
215b8b05 1104 if (!count)
99ad5f6e
MM		 1105 count = scnprintf(buf, len, "no parameters");
1106 else
1107 --count;
1108
1109 count += scnprintf(buf + count, len - count, ", %s",
1110 _regulator_is_enabled(rdev) ? "enabled" : "disabled");
215b8b05 1111
194dbaef 1112 rdev_dbg(rdev, "%s\n", buf);
c845f21a
GU		 1113}
1114#else /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */
1115static inline void print_constraints_debug(struct regulator_dev *rdev) {}
1116#endif /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */
1117
1118static void print_constraints(struct regulator_dev *rdev)
1119{
1120 struct regulation_constraints *constraints = rdev->constraints;
1121
1122 print_constraints_debug(rdev);
4a682922
MB		 1123
1124 if ((constraints->min_uV != constraints->max_uV) &&
8a34e979 1125 !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE))
4a682922
MB		 1126 rdev_warn(rdev,
1127 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 1128}
1129
e79055d6 1130static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 1131 struct regulation_constraints *constraints)
a5766f11 1132{
272e2315 1133 const struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 1134 int ret;
1135
1136 /* do we need to apply the constraint voltage */
1137 if (rdev->constraints->apply_uV &&
fa93fd4e
MB		 1138 rdev->constraints->min_uV && rdev->constraints->max_uV) {
1139 int target_min, target_max;
d22b85a1 1140 int current_uV = regulator_get_voltage_rdev(rdev);
84b3a7c9
DA		 1141
1142 if (current_uV == -ENOTRECOVERABLE) {
48f1b4ef 1143 /* This regulator can't be read and must be initialized */
84b3a7c9
DA		 1144 rdev_info(rdev, "Setting %d-%duV\n",
1145 rdev->constraints->min_uV,
1146 rdev->constraints->max_uV);
1147 _regulator_do_set_voltage(rdev,
1148 rdev->constraints->min_uV,
1149 rdev->constraints->max_uV);
d22b85a1 1150 current_uV = regulator_get_voltage_rdev(rdev);
84b3a7c9
DA		 1151 }
1152
064d5cd1 1153 if (current_uV < 0) {
adea2831
BN		 1154 if (current_uV != -EPROBE_DEFER)
1155 rdev_err(rdev,
1156 "failed to get the current voltage: %pe\n",
1157 ERR_PTR(current_uV));
064d5cd1
AB		 1158 return current_uV;
1159 }
fa93fd4e
MB		 1160
1161 /*
1162 * If we're below the minimum voltage move up to the
1163 * minimum voltage, if we're above the maximum voltage
1164 * then move down to the maximum.
1165 */
1166 target_min = current_uV;
1167 target_max = current_uV;
1168
1169 if (current_uV < rdev->constraints->min_uV) {
1170 target_min = rdev->constraints->min_uV;
1171 target_max = rdev->constraints->min_uV;
1172 }
1173
1174 if (current_uV > rdev->constraints->max_uV) {
1175 target_min = rdev->constraints->max_uV;
1176 target_max = rdev->constraints->max_uV;
1177 }
1178
1179 if (target_min != current_uV || target_max != current_uV) {
45a91e8f
MB		 1180 rdev_info(rdev, "Bringing %duV into %d-%duV\n",
1181 current_uV, target_min, target_max);
064d5cd1 1182 ret = _regulator_do_set_voltage(
fa93fd4e 1183 rdev, target_min, target_max);
064d5cd1
AB		 1184 if (ret < 0) {
1185 rdev_err(rdev,
61aab5ad
MM		 1186 "failed to apply %d-%duV constraint: %pe\n",
1187 target_min, target_max, ERR_PTR(ret));
064d5cd1
AB		 1188 return ret;
1189 }
75790251 1190 }
af5866c9 1191 }
e06f5b4f 1192
4367cfdc
DB		 1193 /* constrain machine-level voltage specs to fit
1194 * the actual range supported by this regulator.
1195 */
1196 if (ops->list_voltage && rdev->desc->n_voltages) {
1197 int count = rdev->desc->n_voltages;
1198 int i;
1199 int min_uV = INT_MAX;
1200 int max_uV = INT_MIN;
1201 int cmin = constraints->min_uV;
1202 int cmax = constraints->max_uV;
1203
3e590918 1204 /* it's safe to autoconfigure fixed-voltage supplies
69b8821e
SK		 1205 * and the constraints are used by list_voltage.
1206 */
4367cfdc 1207 if (count == 1 && !cmin) {
3e590918 1208 cmin = 1;
4367cfdc 1209 cmax = INT_MAX;
3e590918
MB		 1210 constraints->min_uV = cmin;
1211 constraints->max_uV = cmax;
4367cfdc
DB		 1212 }
1213
3e2b9abd
MB		 1214 /* voltage constraints are optional */
1215 if ((cmin == 0) && (cmax == 0))
e79055d6 1216 return 0;
3e2b9abd 1217
4367cfdc 1218 /* else require explicit machine-level constraints */
3e2b9abd 1219 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 1220 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 1221 return -EINVAL;
4367cfdc
DB		 1222 }
1223
6d30fc51
CM		 1224 /* no need to loop voltages if range is continuous */
1225 if (rdev->desc->continuous_voltage_range)
1226 return 0;
1227
4367cfdc
DB		 1228 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
1229 for (i = 0; i < count; i++) {
1230 int value;
1231
1232 value = ops->list_voltage(rdev, i);
1233 if (value <= 0)
1234 continue;
1235
1236 /* maybe adjust [min_uV..max_uV] */
1237 if (value >= cmin && value < min_uV)
1238 min_uV = value;
1239 if (value <= cmax && value > max_uV)
1240 max_uV = value;
1241 }
1242
1243 /* final: [min_uV..max_uV] valid iff constraints valid */
1244 if (max_uV < min_uV) {
fff15bef
MB		 1245 rdev_err(rdev,
1246 "unsupportable voltage constraints %u-%uuV\n",
1247 min_uV, max_uV);
e79055d6 1248 return -EINVAL;
4367cfdc
DB		 1249 }
1250
1251 /* use regulator's subset of machine constraints */
1252 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 1253 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
1254 constraints->min_uV, min_uV);
4367cfdc
DB		 1255 constraints->min_uV = min_uV;
1256 }
1257 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 1258 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
1259 constraints->max_uV, max_uV);
4367cfdc
DB		 1260 constraints->max_uV = max_uV;
1261 }
1262 }
1263
e79055d6
MB		 1264 return 0;
1265}
1266
f8c1700d
LD		 1267static int machine_constraints_current(struct regulator_dev *rdev,
1268 struct regulation_constraints *constraints)
1269{
272e2315 1270 const struct regulator_ops *ops = rdev->desc->ops;
f8c1700d
LD		 1271 int ret;
1272
1273 if (!constraints->min_uA && !constraints->max_uA)
1274 return 0;
1275
1276 if (constraints->min_uA > constraints->max_uA) {
1277 rdev_err(rdev, "Invalid current constraints\n");
1278 return -EINVAL;
1279 }
1280
1281 if (!ops->set_current_limit || !ops->get_current_limit) {
1282 rdev_warn(rdev, "Operation of current configuration missing\n");
1283 return 0;
1284 }
1285
1286 /* Set regulator current in constraints range */
1287 ret = ops->set_current_limit(rdev, constraints->min_uA,
1288 constraints->max_uA);
1289 if (ret < 0) {
1290 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1291 return ret;
1292 }
1293
1294 return 0;
1295}
1296
30c21971
MP		 1297static int _regulator_do_enable(struct regulator_dev *rdev);
1298
89a6a5e5
MV		 1299static int notif_set_limit(struct regulator_dev *rdev,
1300 int (*set)(struct regulator_dev *, int, int, bool),
1301 int limit, int severity)
1302{
1303 bool enable;
1304
1305 if (limit == REGULATOR_NOTIF_LIMIT_DISABLE) {
1306 enable = false;
1307 limit = 0;
1308 } else {
1309 enable = true;
1310 }
1311
1312 if (limit == REGULATOR_NOTIF_LIMIT_ENABLE)
1313 limit = 0;
1314
1315 return set(rdev, limit, severity, enable);
1316}
1317
1318static int handle_notify_limits(struct regulator_dev *rdev,
1319 int (*set)(struct regulator_dev *, int, int, bool),
1320 struct notification_limit *limits)
1321{
1322 int ret = 0;
1323
1324 if (!set)
1325 return -EOPNOTSUPP;
1326
1327 if (limits->prot)
1328 ret = notif_set_limit(rdev, set, limits->prot,
1329 REGULATOR_SEVERITY_PROT);
1330 if (ret)
1331 return ret;
1332
1333 if (limits->err)
1334 ret = notif_set_limit(rdev, set, limits->err,
1335 REGULATOR_SEVERITY_ERR);
1336 if (ret)
1337 return ret;
1338
1339 if (limits->warn)
1340 ret = notif_set_limit(rdev, set, limits->warn,
1341 REGULATOR_SEVERITY_WARN);
1342
1343 return ret;
1344}
e79055d6
MB		 1345/**
1346 * set_machine_constraints - sets regulator constraints
1347 * @rdev: regulator source
e79055d6
MB		 1348 *
1349 * Allows platform initialisation code to define and constrain
1350 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1351 * Constraints *must* be set by platform code in order for some
1352 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1353 * set_mode.
1354 */
57a6ad48 1355static int set_machine_constraints(struct regulator_dev *rdev)
e79055d6
MB		 1356{
1357 int ret = 0;
272e2315 1358 const struct regulator_ops *ops = rdev->desc->ops;
e79055d6 1359
f8c12fe3 1360 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6 1361 if (ret != 0)
6333ef46 1362 return ret;
e79055d6 1363
f8c1700d 1364 ret = machine_constraints_current(rdev, rdev->constraints);
e79055d6 1365 if (ret != 0)
6333ef46 1366 return ret;
e79055d6 1367
36e4f839
SB		 1368 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1369 ret = ops->set_input_current_limit(rdev,
1370 rdev->constraints->ilim_uA);
1371 if (ret < 0) {
61aab5ad 1372 rdev_err(rdev, "failed to set input limit: %pe\n", ERR_PTR(ret));
6333ef46 1373 return ret;
36e4f839
SB		 1374 }
1375 }
1376
a5766f11 1377 /* do we need to setup our suspend state */
9a8f5e07 1378 if (rdev->constraints->initial_state) {
0955f5be 1379 ret = suspend_set_initial_state(rdev);
e06f5b4f 1380 if (ret < 0) {
61aab5ad 1381 rdev_err(rdev, "failed to set suspend state: %pe\n", ERR_PTR(ret));
6333ef46 1382 return ret;
e06f5b4f
MB		 1383 }
1384 }
a5766f11 1385
9a8f5e07 1386 if (rdev->constraints->initial_mode) {
a308466c 1387 if (!ops->set_mode) {
5da84fd9 1388 rdev_err(rdev, "no set_mode operation\n");
6333ef46 1389 return -EINVAL;
a308466c
MB		 1390 }
1391
f8c12fe3 1392 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 1393 if (ret < 0) {
61aab5ad 1394 rdev_err(rdev, "failed to set initial mode: %pe\n", ERR_PTR(ret));
6333ef46 1395 return ret;
a308466c 1396 }
fa94e48e
DA		 1397 } else if (rdev->constraints->system_load) {
1398 /*
1399 * We'll only apply the initial system load if an
1400 * initial mode wasn't specified.
1401 */
1402 drms_uA_update(rdev);
a308466c
MB		 1403 }
1404
1653ccf4
YSB		 1405 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1406 && ops->set_ramp_delay) {
6f0b2c69
YSB		 1407 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1408 if (ret < 0) {
61aab5ad 1409 rdev_err(rdev, "failed to set ramp_delay: %pe\n", ERR_PTR(ret));
6333ef46 1410 return ret;
6f0b2c69
YSB		 1411 }
1412 }
1413
23c779b9
SB		 1414 if (rdev->constraints->pull_down && ops->set_pull_down) {
1415 ret = ops->set_pull_down(rdev);
1416 if (ret < 0) {
61aab5ad 1417 rdev_err(rdev, "failed to set pull down: %pe\n", ERR_PTR(ret));
6333ef46 1418 return ret;
23c779b9
SB		 1419 }
1420 }
1421
57f66b78
SB		 1422 if (rdev->constraints->soft_start && ops->set_soft_start) {
1423 ret = ops->set_soft_start(rdev);
1424 if (ret < 0) {
61aab5ad 1425 rdev_err(rdev, "failed to set soft start: %pe\n", ERR_PTR(ret));
6333ef46 1426 return ret;
57f66b78
SB		 1427 }
1428 }
1429
89a6a5e5
MV		 1430 /*
1431 * Existing logic does not warn if over_current_protection is given as
1432 * a constraint but driver does not support that. I think we should
1433 * warn about this type of issues as it is possible someone changes
1434 * PMIC on board to another type - and the another PMIC's driver does
1435 * not support setting protection. Board composer may happily believe
1436 * the DT limits are respected - especially if the new PMIC HW also
1437 * supports protection but the driver does not. I won't change the logic
1438 * without hearing more experienced opinion on this though.
1439 *
1440 * If warning is seen as a good idea then we can merge handling the
1441 * over-curret protection and detection and get rid of this special
1442 * handling.
1443 */
3a003bae
SB		 1444 if (rdev->constraints->over_current_protection
1445 && ops->set_over_current_protection) {
89a6a5e5
MV		 1446 int lim = rdev->constraints->over_curr_limits.prot;
1447
1448 ret = ops->set_over_current_protection(rdev, lim,
1449 REGULATOR_SEVERITY_PROT,
1450 true);
3a003bae 1451 if (ret < 0) {
61aab5ad
MM		 1452 rdev_err(rdev, "failed to set over current protection: %pe\n",
1453 ERR_PTR(ret));
6333ef46 1454 return ret;
3a003bae
SB		 1455 }
1456 }
1457
89a6a5e5
MV		 1458 if (rdev->constraints->over_current_detection)
1459 ret = handle_notify_limits(rdev,
1460 ops->set_over_current_protection,
1461 &rdev->constraints->over_curr_limits);
1462 if (ret) {
1463 if (ret != -EOPNOTSUPP) {
1464 rdev_err(rdev, "failed to set over current limits: %pe\n",
1465 ERR_PTR(ret));
1466 return ret;
1467 }
1468 rdev_warn(rdev,
1469 "IC does not support requested over-current limits\n");
1470 }
1471
1472 if (rdev->constraints->over_voltage_detection)
1473 ret = handle_notify_limits(rdev,
1474 ops->set_over_voltage_protection,
1475 &rdev->constraints->over_voltage_limits);
1476 if (ret) {
1477 if (ret != -EOPNOTSUPP) {
1478 rdev_err(rdev, "failed to set over voltage limits %pe\n",
1479 ERR_PTR(ret));
1480 return ret;
1481 }
1482 rdev_warn(rdev,
1483 "IC does not support requested over voltage limits\n");
1484 }
1485
1486 if (rdev->constraints->under_voltage_detection)
1487 ret = handle_notify_limits(rdev,
1488 ops->set_under_voltage_protection,
1489 &rdev->constraints->under_voltage_limits);
1490 if (ret) {
1491 if (ret != -EOPNOTSUPP) {
1492 rdev_err(rdev, "failed to set under voltage limits %pe\n",
1493 ERR_PTR(ret));
1494 return ret;
1495 }
1496 rdev_warn(rdev,
1497 "IC does not support requested under voltage limits\n");
1498 }
1499
1500 if (rdev->constraints->over_temp_detection)
1501 ret = handle_notify_limits(rdev,
1502 ops->set_thermal_protection,
1503 &rdev->constraints->temp_limits);
1504 if (ret) {
1505 if (ret != -EOPNOTSUPP) {
1506 rdev_err(rdev, "failed to set temperature limits %pe\n",
1507 ERR_PTR(ret));
1508 return ret;
1509 }
1510 rdev_warn(rdev,
1511 "IC does not support requested temperature limits\n");
1512 }
1513
670666b9
LD		 1514 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1515 bool ad_state = (rdev->constraints->active_discharge ==
1516 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1517
1518 ret = ops->set_active_discharge(rdev, ad_state);
1519 if (ret < 0) {
61aab5ad 1520 rdev_err(rdev, "failed to set active discharge: %pe\n", ERR_PTR(ret));
670666b9
LD		 1521 return ret;
1522 }
1523 }
1524
2bb16663
OS		 1525 /* If the constraints say the regulator should be on at this point
1526 * and we have control then make sure it is enabled.
1527 */
1528 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
98e48cd9
DB		 1529 /* If we want to enable this regulator, make sure that we know
1530 * the supplying regulator.
1531 */
1532 if (rdev->supply_name && !rdev->supply)
1533 return -EPROBE_DEFER;
1534
05f224ca
DA		 1535 if (rdev->supply) {
1536 ret = regulator_enable(rdev->supply);
1537 if (ret < 0) {
1538 _regulator_put(rdev->supply);
1539 rdev->supply = NULL;
1540 return ret;
1541 }
1542 }
1543
2bb16663
OS		 1544 ret = _regulator_do_enable(rdev);
1545 if (ret < 0 && ret != -EINVAL) {
61aab5ad 1546 rdev_err(rdev, "failed to enable: %pe\n", ERR_PTR(ret));
2bb16663
OS		 1547 return ret;
1548 }
089b3f61
PP		 1549
1550 if (rdev->constraints->always_on)
1551 rdev->use_count++;
a5ccccb3 1552 } else if (rdev->desc->off_on_delay) {
a8ce7bd8 1553 rdev->last_off = ktime_get();
2bb16663
OS		 1554 }
1555
a5766f11 1556 print_constraints(rdev);
1a6958e7 1557 return 0;
a5766f11
LG		 1558}
1559
1560/**
1561 * set_supply - set regulator supply regulator
69279fb9
MB		 1562 * @rdev: regulator name
1563 * @supply_rdev: supply regulator name
a5766f11
LG		 1564 *
1565 * Called by platform initialisation code to set the supply regulator for this
1566 * regulator. This ensures that a regulators supply will also be enabled by the
1567 * core if it's child is enabled.
1568 */
1569static int set_supply(struct regulator_dev *rdev,
3801b86a 1570 struct regulator_dev *supply_rdev)
a5766f11
LG		 1571{
1572 int err;
1573
3801b86a
MB		 1574 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1575
e2c09ae7
JMC		 1576 if (!try_module_get(supply_rdev->owner))
1577 return -ENODEV;
1578
3801b86a 1579 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 1580 if (rdev->supply == NULL) {
1581 err = -ENOMEM;
3801b86a 1582 return err;
a5766f11 1583 }
57ad526a 1584 supply_rdev->open_count++;
3801b86a
MB		 1585
1586 return 0;
a5766f11
LG		 1587}
1588
1589/**
06c63f93 1590 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 1591 * @rdev: regulator source
40f9244f 1592 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 1593 * @supply: symbolic name for supply
a5766f11
LG		 1594 *
1595 * Allows platform initialisation code to map physical regulator
1596 * sources to symbolic names for supplies for use by devices. Devices
1597 * should use these symbolic names to request regulators, avoiding the
1598 * need to provide board-specific regulator names as platform data.
1599 */
1600static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 1601 const char *consumer_dev_name,
1602 const char *supply)
a5766f11 1603{
5c065401 1604 struct regulator_map *node, *new_node;
9ed2099e 1605 int has_dev;
a5766f11
LG		 1606
1607 if (supply == NULL)
1608 return -EINVAL;
1609
9ed2099e
MB		 1610 if (consumer_dev_name != NULL)
1611 has_dev = 1;
1612 else
1613 has_dev = 0;
1614
5c065401
MM		 1615 new_node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1616 if (new_node == NULL)
1617 return -ENOMEM;
1618
1619 new_node->regulator = rdev;
1620 new_node->supply = supply;
1621
1622 if (has_dev) {
1623 new_node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1624 if (new_node->dev_name == NULL) {
1625 kfree(new_node);
1626 return -ENOMEM;
1627 }
1628 }
1629
1630 mutex_lock(&regulator_list_mutex);
6001e13c 1631 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1632 if (node->dev_name && consumer_dev_name) {
1633 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1634 continue;
1635 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1636 continue;
23b5cc2a
JN		 1637 }
1638
6001e13c
DB		 1639 if (strcmp(node->supply, supply) != 0)
1640 continue;
1641
737f360d
MB		 1642 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1643 consumer_dev_name,
1644 dev_name(&node->regulator->dev),
1645 node->regulator->desc->name,
1646 supply,
1647 dev_name(&rdev->dev), rdev_get_name(rdev));
5c065401 1648 goto fail;
6001e13c
DB		 1649 }
1650
5c065401
MM		 1651 list_add(&new_node->list, &regulator_map_list);
1652 mutex_unlock(&regulator_list_mutex);
40f9244f 1653
a5766f11 1654 return 0;
5c065401
MM		 1655
1656fail:
1657 mutex_unlock(&regulator_list_mutex);
1658 kfree(new_node->dev_name);
1659 kfree(new_node);
1660 return -EBUSY;
a5766f11
LG		 1661}
1662
0f1d747b
MR		 1663static void unset_regulator_supplies(struct regulator_dev *rdev)
1664{
1665 struct regulator_map *node, *n;
1666
1667 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1668 if (rdev == node->regulator) {
1669 list_del(&node->list);
40f9244f 1670 kfree(node->dev_name);
0f1d747b 1671 kfree(node);
0f1d747b
MR		 1672 }
1673 }
1674}
1675
2d80a91b
RF		 1676#ifdef CONFIG_DEBUG_FS
1677static ssize_t constraint_flags_read_file(struct file *file,
1678 char __user *user_buf,
1679 size_t count, loff_t *ppos)
1680{
1681 const struct regulator *regulator = file->private_data;
1682 const struct regulation_constraints *c = regulator->rdev->constraints;
1683 char *buf;
1684 ssize_t ret;
1685
1686 if (!c)
1687 return 0;
1688
1689 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1690 if (!buf)
1691 return -ENOMEM;
1692
1693 ret = snprintf(buf, PAGE_SIZE,
1694 "always_on: %u\n"
1695 "boot_on: %u\n"
1696 "apply_uV: %u\n"
1697 "ramp_disable: %u\n"
1698 "soft_start: %u\n"
1699 "pull_down: %u\n"
1700 "over_current_protection: %u\n",
1701 c->always_on,
1702 c->boot_on,
1703 c->apply_uV,
1704 c->ramp_disable,
1705 c->soft_start,
1706 c->pull_down,
1707 c->over_current_protection);
1708
1709 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1710 kfree(buf);
1711
1712 return ret;
1713}
1714
1715#endif
1716
1717static const struct file_operations constraint_flags_fops = {
1718#ifdef CONFIG_DEBUG_FS
1719 .open = simple_open,
1720 .read = constraint_flags_read_file,
1721 .llseek = default_llseek,
1722#endif
1723};
1724
f5726ae3 1725#define REG_STR_SIZE 64
414c70cb
LG		 1726
1727static struct regulator *create_regulator(struct regulator_dev *rdev,
1728 struct device *dev,
1729 const char *supply_name)
1730{
1731 struct regulator *regulator;
dbe954d8 1732 int err = 0;
87fe29b6
MM		 1733
1734 if (dev) {
1735 char buf[REG_STR_SIZE];
1736 int size;
1737
1738 size = snprintf(buf, REG_STR_SIZE, "%s-%s",
1739 dev->kobj.name, supply_name);
1740 if (size >= REG_STR_SIZE)
1741 return NULL;
1742
1743 supply_name = kstrdup(buf, GFP_KERNEL);
1744 if (supply_name == NULL)
1745 return NULL;
1746 } else {
1747 supply_name = kstrdup_const(supply_name, GFP_KERNEL);
1748 if (supply_name == NULL)
1749 return NULL;
1750 }
414c70cb
LG		 1751
1752 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
87fe29b6
MM		 1753 if (regulator == NULL) {
1754 kfree(supply_name);
414c70cb 1755 return NULL;
87fe29b6 1756 }
414c70cb 1757
414c70cb 1758 regulator->rdev = rdev;
87fe29b6
MM		 1759 regulator->supply_name = supply_name;
1760
1761 regulator_lock(rdev);
414c70cb 1762 list_add(&regulator->list, &rdev->consumer_list);
87fe29b6 1763 regulator_unlock(rdev);
414c70cb
LG		 1764
1765 if (dev) {
e2c98eaf
SG		 1766 regulator->dev = dev;
1767
222cc7b1 1768 /* Add a link to the device sysfs entry */
ff268b56 1769 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
87fe29b6 1770 supply_name);
414c70cb 1771 if (err) {
61aab5ad
MM		 1772 rdev_dbg(rdev, "could not add device link %s: %pe\n",
1773 dev->kobj.name, ERR_PTR(err));
222cc7b1 1774 /* non-fatal */
414c70cb 1775 }
5de70519
MB		 1776 }
1777
dbe954d8
HG		 1778 if (err != -EEXIST)
1779 regulator->debugfs = debugfs_create_dir(supply_name, rdev->debugfs);
24751434 1780 if (!regulator->debugfs) {
ad3a942b 1781 rdev_dbg(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1782 } else {
1783 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1784 &regulator->uA_load);
1785 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
c360a6df 1786 &regulator->voltage[PM_SUSPEND_ON].min_uV);
5de70519 1787 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
c360a6df 1788 &regulator->voltage[PM_SUSPEND_ON].max_uV);
2d80a91b
RF		 1789 debugfs_create_file("constraint_flags", 0444,
1790 regulator->debugfs, regulator,
1791 &constraint_flags_fops);
414c70cb 1792 }
5de70519 1793
6492bc1b
MB		 1794 /*
1795 * Check now if the regulator is an always on regulator - if
1796 * it is then we don't need to do nearly so much work for
1797 * enable/disable calls.
1798 */
8a34e979 1799 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) &&
6492bc1b
MB		 1800 _regulator_is_enabled(rdev))
1801 regulator->always_on = true;
1802
414c70cb 1803 return regulator;
414c70cb
LG		 1804}
1805
31aae2be
MB		 1806static int _regulator_get_enable_time(struct regulator_dev *rdev)
1807{
00c877c6
LD		 1808 if (rdev->constraints && rdev->constraints->enable_time)
1809 return rdev->constraints->enable_time;
68ce3a44
AL		 1810 if (rdev->desc->ops->enable_time)
1811 return rdev->desc->ops->enable_time(rdev);
1812 return rdev->desc->enable_time;
31aae2be
MB		 1813}
1814
a06ccd9c
CK		 1815static struct regulator_supply_alias *regulator_find_supply_alias(
1816 struct device *dev, const char *supply)
1817{
1818 struct regulator_supply_alias *map;
1819
1820 list_for_each_entry(map, &regulator_supply_alias_list, list)
1821 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1822 return map;
1823
1824 return NULL;
1825}
1826
1827static void regulator_supply_alias(struct device **dev, const char **supply)
1828{
1829 struct regulator_supply_alias *map;
1830
1831 map = regulator_find_supply_alias(*dev, *supply);
1832 if (map) {
1833 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1834 *supply, map->alias_supply,
1835 dev_name(map->alias_dev));
1836 *dev = map->alias_dev;
1837 *supply = map->alias_supply;
1838 }
1839}
1840
85f3b431
TV		 1841static int regulator_match(struct device *dev, const void *data)
1842{
1843 struct regulator_dev *r = dev_to_rdev(dev);
1844
1845 return strcmp(rdev_get_name(r), data) == 0;
1846}
1847
1848static struct regulator_dev *regulator_lookup_by_name(const char *name)
1849{
1850 struct device *dev;
1851
1852 dev = class_find_device(&regulator_class, NULL, name, regulator_match);
1853
1854 return dev ? dev_to_rdev(dev) : NULL;
1855}
1856
1857/**
1858 * regulator_dev_lookup - lookup a regulator device.
1859 * @dev: device for regulator "consumer".
1860 * @supply: Supply name or regulator ID.
85f3b431
TV		 1861 *
1862 * If successful, returns a struct regulator_dev that corresponds to the name
163478da
DT		 1863 * @supply and with the embedded struct device refcount incremented by one.
1864 * The refcount must be dropped by calling put_device().
1865 * On failure one of the following ERR-PTR-encoded values is returned:
1866 * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
1867 * in the future.
85f3b431 1868 */
69511a45 1869static struct regulator_dev *regulator_dev_lookup(struct device *dev,
163478da 1870 const char *supply)
69511a45 1871{
06217197 1872 struct regulator_dev *r = NULL;
69511a45 1873 struct device_node *node;
576ca436
MB		 1874 struct regulator_map *map;
1875 const char *devname = NULL;
69511a45 1876
a06ccd9c
CK		 1877 regulator_supply_alias(&dev, &supply);
1878
69511a45
RN		 1879 /* first do a dt based lookup */
1880 if (dev && dev->of_node) {
1881 node = of_get_regulator(dev, supply);
6d191a5f 1882 if (node) {
85f3b431
TV		 1883 r = of_find_regulator_by_node(node);
1884 if (r)
1885 return r;
163478da 1886
6d191a5f 1887 /*
163478da
DT		 1888 * We have a node, but there is no device.
1889 * assume it has not registered yet.
6d191a5f 1890 */
163478da 1891 return ERR_PTR(-EPROBE_DEFER);
6d191a5f 1892 }
69511a45
RN		 1893 }
1894
1895 /* if not found, try doing it non-dt way */
576ca436
MB		 1896 if (dev)
1897 devname = dev_name(dev);
1898
85f3b431 1899 mutex_lock(&regulator_list_mutex);
576ca436
MB		 1900 list_for_each_entry(map, &regulator_map_list, list) {
1901 /* If the mapping has a device set up it must match */
1902 if (map->dev_name &&
1903 (!devname || strcmp(map->dev_name, devname)))
1904 continue;
1905
85f3b431
TV		 1906 if (strcmp(map->supply, supply) == 0 &&
1907 get_device(&map->regulator->dev)) {
163478da
DT		 1908 r = map->regulator;
1909 break;
85f3b431 1910 }
576ca436 1911 }
85f3b431 1912 mutex_unlock(&regulator_list_mutex);
576ca436 1913
06217197
CK		 1914 if (r)
1915 return r;
1916
1917 r = regulator_lookup_by_name(supply);
163478da
DT		 1918 if (r)
1919 return r;
1920
1921 return ERR_PTR(-ENODEV);
69511a45
RN		 1922}
1923
6261b06d
BA		 1924static int regulator_resolve_supply(struct regulator_dev *rdev)
1925{
1926 struct regulator_dev *r;
1927 struct device *dev = rdev->dev.parent;
eaa7995c 1928 int ret = 0;
6261b06d 1929
48f1b4ef 1930 /* No supply to resolve? */
6261b06d
BA		 1931 if (!rdev->supply_name)
1932 return 0;
1933
eaa7995c 1934 /* Supply already resolved? (fast-path without locking contention) */
6261b06d
BA		 1935 if (rdev->supply)
1936 return 0;
1937
163478da
DT		 1938 r = regulator_dev_lookup(dev, rdev->supply_name);
1939 if (IS_ERR(r)) {
1940 ret = PTR_ERR(r);
1941
06423121
MB		 1942 /* Did the lookup explicitly defer for us? */
1943 if (ret == -EPROBE_DEFER)
eaa7995c 1944 goto out;
06423121 1945
9f7e25ed
MB		 1946 if (have_full_constraints()) {
1947 r = dummy_regulator_rdev;
85f3b431 1948 get_device(&r->dev);
9f7e25ed
MB		 1949 } else {
1950 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1951 rdev->supply_name, rdev->desc->name);
eaa7995c
DC		 1952 ret = -EPROBE_DEFER;
1953 goto out;
9f7e25ed 1954 }
6261b06d
BA		 1955 }
1956
4b639e25
MM		 1957 if (r == rdev) {
1958 dev_err(dev, "Supply for %s (%s) resolved to itself\n",
1959 rdev->desc->name, rdev->supply_name);
eaa7995c
DC		 1960 if (!have_full_constraints()) {
1961 ret = -EINVAL;
1962 goto out;
1963 }
f5c042b2
MM		 1964 r = dummy_regulator_rdev;
1965 get_device(&r->dev);
4b639e25
MM		 1966 }
1967
66d228a2
JH		 1968 /*
1969 * If the supply's parent device is not the same as the
1970 * regulator's parent device, then ensure the parent device
1971 * is bound before we resolve the supply, in case the parent
1972 * device get probe deferred and unregisters the supply.
1973 */
1974 if (r->dev.parent && r->dev.parent != rdev->dev.parent) {
1975 if (!device_is_bound(r->dev.parent)) {
1976 put_device(&r->dev);
eaa7995c
DC		 1977 ret = -EPROBE_DEFER;
1978 goto out;
66d228a2
JH		 1979 }
1980 }
1981
6261b06d
BA		 1982 /* Recursively resolve the supply of the supply */
1983 ret = regulator_resolve_supply(r);
85f3b431
TV		 1984 if (ret < 0) {
1985 put_device(&r->dev);
eaa7995c 1986 goto out;
85f3b431 1987 }
6261b06d 1988
14a71d50
MB		 1989 /*
1990 * Recheck rdev->supply with rdev->mutex lock held to avoid a race
1991 * between rdev->supply null check and setting rdev->supply in
1992 * set_supply() from concurrent tasks.
1993 */
1994 regulator_lock(rdev);
1995
1996 /* Supply just resolved by a concurrent task? */
1997 if (rdev->supply) {
1998 regulator_unlock(rdev);
1999 put_device(&r->dev);
2000 goto out;
2001 }
2002
6261b06d 2003 ret = set_supply(rdev, r);
85f3b431 2004 if (ret < 0) {
14a71d50 2005 regulator_unlock(rdev);
85f3b431 2006 put_device(&r->dev);
eaa7995c 2007 goto out;
85f3b431 2008 }
6261b06d 2009
14a71d50
MB		 2010 regulator_unlock(rdev);
2011
05f224ca
DA		 2012 /*
2013 * In set_machine_constraints() we may have turned this regulator on
2014 * but we couldn't propagate to the supply if it hadn't been resolved
2015 * yet. Do it now.
2016 */
2017 if (rdev->use_count) {
6261b06d 2018 ret = regulator_enable(rdev->supply);
36a1f1b6 2019 if (ret < 0) {
9f8df6ad 2020 _regulator_put(rdev->supply);
8e5356a7 2021 rdev->supply = NULL;
eaa7995c 2022 goto out;
36a1f1b6 2023 }
6261b06d
BA		 2024 }
2025
eaa7995c 2026out:
eaa7995c 2027 return ret;
6261b06d
BA		 2028}
2029
5ffbd136 2030/* Internal regulator request function */
a8bd42a9
DT		 2031struct regulator *_regulator_get(struct device *dev, const char *id,
2032 enum regulator_get_type get_type)
414c70cb
LG		 2033{
2034 struct regulator_dev *rdev;
7d245afa 2035 struct regulator *regulator;
b59b6544 2036 struct device_link *link;
317b5684 2037 int ret;
414c70cb 2038
a8bd42a9
DT		 2039 if (get_type >= MAX_GET_TYPE) {
2040 dev_err(dev, "invalid type %d in %s\n", get_type, __func__);
2041 return ERR_PTR(-EINVAL);
2042 }
2043
414c70cb 2044 if (id == NULL) {
5da84fd9 2045 pr_err("get() with no identifier\n");
043c998f 2046 return ERR_PTR(-EINVAL);
414c70cb
LG		 2047 }
2048
163478da 2049 rdev = regulator_dev_lookup(dev, id);
a4d7641f
DT		 2050 if (IS_ERR(rdev)) {
2051 ret = PTR_ERR(rdev);
1e4b545c 2052
a4d7641f
DT		 2053 /*
2054 * If regulator_dev_lookup() fails with error other
2055 * than -ENODEV our job here is done, we simply return it.
2056 */
2057 if (ret != -ENODEV)
2058 return ERR_PTR(ret);
34abbd68 2059
a4d7641f
DT		 2060 if (!have_full_constraints()) {
2061 dev_warn(dev,
2062 "incomplete constraints, dummy supplies not allowed\n");
2063 return ERR_PTR(-ENODEV);
2064 }
4ddfebd3 2065
a4d7641f
DT		 2066 switch (get_type) {
2067 case NORMAL_GET:
2068 /*
2069 * Assume that a regulator is physically present and
2070 * enabled, even if it isn't hooked up, and just
2071 * provide a dummy.
2072 */
6e5505cf 2073 dev_warn(dev, "supply %s not found, using dummy regulator\n", id);
a4d7641f
DT		 2074 rdev = dummy_regulator_rdev;
2075 get_device(&rdev->dev);
2076 break;
34abbd68 2077
a4d7641f
DT		 2078 case EXCLUSIVE_GET:
2079 dev_warn(dev,
2080 "dummy supplies not allowed for exclusive requests\n");
df561f66 2081 fallthrough;
34abbd68 2082
a4d7641f
DT		 2083 default:
2084 return ERR_PTR(-ENODEV);
2085 }
34abbd68 2086 }
34abbd68 2087
5ffbd136
MB		 2088 if (rdev->exclusive) {
2089 regulator = ERR_PTR(-EPERM);
85f3b431
TV		 2090 put_device(&rdev->dev);
2091 return regulator;
5ffbd136
MB		 2092 }
2093
a8bd42a9 2094 if (get_type == EXCLUSIVE_GET && rdev->open_count) {
5ffbd136 2095 regulator = ERR_PTR(-EBUSY);
85f3b431
TV		 2096 put_device(&rdev->dev);
2097 return regulator;
5ffbd136
MB		 2098 }
2099
79d6f049
DO		 2100 mutex_lock(&regulator_list_mutex);
2101 ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled);
2102 mutex_unlock(&regulator_list_mutex);
2103
2104 if (ret != 0) {
2105 regulator = ERR_PTR(-EPROBE_DEFER);
2106 put_device(&rdev->dev);
2107 return regulator;
2108 }
2109
6261b06d
BA		 2110 ret = regulator_resolve_supply(rdev);
2111 if (ret < 0) {
2112 regulator = ERR_PTR(ret);
85f3b431
TV		 2113 put_device(&rdev->dev);
2114 return regulator;
6261b06d
BA		 2115 }
2116
85f3b431 2117 if (!try_module_get(rdev->owner)) {
7d245afa 2118 regulator = ERR_PTR(-EPROBE_DEFER);
85f3b431
TV		 2119 put_device(&rdev->dev);
2120 return regulator;
2121 }
a5766f11 2122
414c70cb
LG		 2123 regulator = create_regulator(rdev, dev, id);
2124 if (regulator == NULL) {
2125 regulator = ERR_PTR(-ENOMEM);
2126 module_put(rdev->owner);
4affd79a 2127 put_device(&rdev->dev);
85f3b431 2128 return regulator;
414c70cb
LG		 2129 }
2130
5ffbd136 2131 rdev->open_count++;
a8bd42a9 2132 if (get_type == EXCLUSIVE_GET) {
5ffbd136
MB		 2133 rdev->exclusive = 1;
2134
2135 ret = _regulator_is_enabled(rdev);
2136 if (ret > 0)
2137 rdev->use_count = 1;
2138 else
2139 rdev->use_count = 0;
2140 }
2141
b59b6544
SK		 2142 link = device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS);
2143 if (!IS_ERR_OR_NULL(link))
2144 regulator->device_link = true;
ed1ae2dd 2145
414c70cb
LG		 2146 return regulator;
2147}
5ffbd136
MB		 2148
2149/**
2150 * regulator_get - lookup and obtain a reference to a regulator.
2151 * @dev: device for regulator "consumer"
2152 * @id: Supply name or regulator ID.
2153 *
2154 * Returns a struct regulator corresponding to the regulator producer,
2155 * or IS_ERR() condition containing errno.
2156 *
90cf443d 2157 * Use of supply names configured via set_consumer_device_supply() is
5ffbd136
MB		 2158 * strongly encouraged. It is recommended that the supply name used
2159 * should match the name used for the supply and/or the relevant
2160 * device pins in the datasheet.
2161 */
2162struct regulator *regulator_get(struct device *dev, const char *id)
2163{
a8bd42a9 2164 return _regulator_get(dev, id, NORMAL_GET);
5ffbd136 2165}
414c70cb
LG		 2166EXPORT_SYMBOL_GPL(regulator_get);
2167
5ffbd136
MB		 2168/**
2169 * regulator_get_exclusive - obtain exclusive access to a regulator.
2170 * @dev: device for regulator "consumer"
2171 * @id: Supply name or regulator ID.
2172 *
2173 * Returns a struct regulator corresponding to the regulator producer,
2174 * or IS_ERR() condition containing errno. Other consumers will be
69c3f723
SB		 2175 * unable to obtain this regulator while this reference is held and the
2176 * use count for the regulator will be initialised to reflect the current
2177 * state of the regulator.
5ffbd136
MB		 2178 *
2179 * This is intended for use by consumers which cannot tolerate shared
2180 * use of the regulator such as those which need to force the
2181 * regulator off for correct operation of the hardware they are
2182 * controlling.
2183 *
90cf443d 2184 * Use of supply names configured via set_consumer_device_supply() is
5ffbd136
MB		 2185 * strongly encouraged. It is recommended that the supply name used
2186 * should match the name used for the supply and/or the relevant
2187 * device pins in the datasheet.
2188 */
2189struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
2190{
a8bd42a9 2191 return _regulator_get(dev, id, EXCLUSIVE_GET);
5ffbd136
MB		 2192}
2193EXPORT_SYMBOL_GPL(regulator_get_exclusive);
2194
de1dd9fd
MB		 2195/**
2196 * regulator_get_optional - obtain optional access to a regulator.
2197 * @dev: device for regulator "consumer"
2198 * @id: Supply name or regulator ID.
2199 *
2200 * Returns a struct regulator corresponding to the regulator producer,
69c3f723 2201 * or IS_ERR() condition containing errno.
de1dd9fd
MB		 2202 *
2203 * This is intended for use by consumers for devices which can have
2204 * some supplies unconnected in normal use, such as some MMC devices.
2205 * It can allow the regulator core to provide stub supplies for other
2206 * supplies requested using normal regulator_get() calls without
2207 * disrupting the operation of drivers that can handle absent
2208 * supplies.
2209 *
90cf443d 2210 * Use of supply names configured via set_consumer_device_supply() is
de1dd9fd
MB		 2211 * strongly encouraged. It is recommended that the supply name used
2212 * should match the name used for the supply and/or the relevant
2213 * device pins in the datasheet.
2214 */
2215struct regulator *regulator_get_optional(struct device *dev, const char *id)
2216{
a8bd42a9 2217 return _regulator_get(dev, id, OPTIONAL_GET);
de1dd9fd
MB		 2218}
2219EXPORT_SYMBOL_GPL(regulator_get_optional);
2220
e1794aa4 2221static void destroy_regulator(struct regulator *regulator)
414c70cb 2222{
e1794aa4 2223 struct regulator_dev *rdev = regulator->rdev;
414c70cb 2224
5de70519 2225 debugfs_remove_recursive(regulator->debugfs);
5de70519 2226
ed1ae2dd 2227 if (regulator->dev) {
b59b6544
SK		 2228 if (regulator->device_link)
2229 device_link_remove(regulator->dev, &rdev->dev);
ed1ae2dd 2230
2231 /* remove any sysfs entries */
414c70cb 2232 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
ed1ae2dd 2233 }
2234
66cf9a7e 2235 regulator_lock(rdev);
414c70cb 2236 list_del(&regulator->list);
414c70cb 2237
5ffbd136
MB		 2238 rdev->open_count--;
2239 rdev->exclusive = 0;
66cf9a7e 2240 regulator_unlock(rdev);
5ffbd136 2241
0630b614 2242 kfree_const(regulator->supply_name);
1768514e 2243 kfree(regulator);
e1794aa4
SK		 2244}
2245
2246/* regulator_list_mutex lock held by regulator_put() */
2247static void _regulator_put(struct regulator *regulator)
2248{
2249 struct regulator_dev *rdev;
2250
2251 if (IS_ERR_OR_NULL(regulator))
2252 return;
2253
2254 lockdep_assert_held_once(&regulator_list_mutex);
2255
2256 /* Docs say you must disable before calling regulator_put() */
2257 WARN_ON(regulator->enable_count);
2258
2259 rdev = regulator->rdev;
2260
2261 destroy_regulator(regulator);
1768514e 2262
414c70cb 2263 module_put(rdev->owner);
4affd79a 2264 put_device(&rdev->dev);
23ff2f0f
CK		 2265}
2266
2267/**
2268 * regulator_put - "free" the regulator source
2269 * @regulator: regulator source
2270 *
2271 * Note: drivers must ensure that all regulator_enable calls made on this
2272 * regulator source are balanced by regulator_disable calls prior to calling
2273 * this function.
2274 */
2275void regulator_put(struct regulator *regulator)
2276{
2277 mutex_lock(&regulator_list_mutex);
2278 _regulator_put(regulator);
414c70cb
LG		 2279 mutex_unlock(&regulator_list_mutex);
2280}
2281EXPORT_SYMBOL_GPL(regulator_put);
2282
a06ccd9c
CK		 2283/**
2284 * regulator_register_supply_alias - Provide device alias for supply lookup
2285 *
2286 * @dev: device that will be given as the regulator "consumer"
2287 * @id: Supply name or regulator ID
2288 * @alias_dev: device that should be used to lookup the supply
2289 * @alias_id: Supply name or regulator ID that should be used to lookup the
2290 * supply
2291 *
2292 * All lookups for id on dev will instead be conducted for alias_id on
2293 * alias_dev.
2294 */
2295int regulator_register_supply_alias(struct device *dev, const char *id,
2296 struct device *alias_dev,
2297 const char *alias_id)
2298{
2299 struct regulator_supply_alias *map;
2300
2301 map = regulator_find_supply_alias(dev, id);
2302 if (map)
2303 return -EEXIST;
2304
2305 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
2306 if (!map)
2307 return -ENOMEM;
2308
2309 map->src_dev = dev;
2310 map->src_supply = id;
2311 map->alias_dev = alias_dev;
2312 map->alias_supply = alias_id;
2313
2314 list_add(&map->list, &regulator_supply_alias_list);
2315
2316 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
2317 id, dev_name(dev), alias_id, dev_name(alias_dev));
2318
2319 return 0;
2320}
2321EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
2322
2323/**
2324 * regulator_unregister_supply_alias - Remove device alias
2325 *
2326 * @dev: device that will be given as the regulator "consumer"
2327 * @id: Supply name or regulator ID
2328 *
2329 * Remove a lookup alias if one exists for id on dev.
2330 */
2331void regulator_unregister_supply_alias(struct device *dev, const char *id)
2332{
2333 struct regulator_supply_alias *map;
2334
2335 map = regulator_find_supply_alias(dev, id);
2336 if (map) {
2337 list_del(&map->list);
2338 kfree(map);
2339 }
2340}
2341EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
2342
2343/**
2344 * regulator_bulk_register_supply_alias - register multiple aliases
2345 *
2346 * @dev: device that will be given as the regulator "consumer"
2347 * @id: List of supply names or regulator IDs
2348 * @alias_dev: device that should be used to lookup the supply
2349 * @alias_id: List of supply names or regulator IDs that should be used to
2350 * lookup the supply
2351 * @num_id: Number of aliases to register
2352 *
2353 * @return 0 on success, an errno on failure.
2354 *
2355 * This helper function allows drivers to register several supply
2356 * aliases in one operation. If any of the aliases cannot be
2357 * registered any aliases that were registered will be removed
2358 * before returning to the caller.
2359 */
9f8c0fe9
LJ		 2360int regulator_bulk_register_supply_alias(struct device *dev,
2361 const char *const *id,
a06ccd9c 2362 struct device *alias_dev,
9f8c0fe9 2363 const char *const *alias_id,
a06ccd9c
CK		 2364 int num_id)
2365{
2366 int i;
2367 int ret;
2368
2369 for (i = 0; i < num_id; ++i) {
2370 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
2371 alias_id[i]);
2372 if (ret < 0)
2373 goto err;
2374 }
2375
2376 return 0;
2377
2378err:
2379 dev_err(dev,
2380 "Failed to create supply alias %s,%s -> %s,%s\n",
2381 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
2382
2383 while (--i >= 0)
2384 regulator_unregister_supply_alias(dev, id[i]);
2385
2386 return ret;
2387}
2388EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
2389
2390/**
2391 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
2392 *
2393 * @dev: device that will be given as the regulator "consumer"
2394 * @id: List of supply names or regulator IDs
2395 * @num_id: Number of aliases to unregister
2396 *
2397 * This helper function allows drivers to unregister several supply
2398 * aliases in one operation.
2399 */
2400void regulator_bulk_unregister_supply_alias(struct device *dev,
9f8c0fe9 2401 const char *const *id,
a06ccd9c
CK		 2402 int num_id)
2403{
2404 int i;
2405
2406 for (i = 0; i < num_id; ++i)
2407 regulator_unregister_supply_alias(dev, id[i]);
2408}
2409EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
2410
2411
f19b00da
KM		 2412/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
2413static int regulator_ena_gpio_request(struct regulator_dev *rdev,
2414 const struct regulator_config *config)
2415{
467bf301 2416 struct regulator_enable_gpio *pin, *new_pin;
778b28b4 2417 struct gpio_desc *gpiod;
f19b00da 2418
541d052d 2419 gpiod = config->ena_gpiod;
467bf301
MM		 2420 new_pin = kzalloc(sizeof(*new_pin), GFP_KERNEL);
2421
2422 mutex_lock(&regulator_list_mutex);
778b28b4 2423
f19b00da 2424 list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
778b28b4 2425 if (pin->gpiod == gpiod) {
541d052d 2426 rdev_dbg(rdev, "GPIO is already used\n");
f19b00da
KM		 2427 goto update_ena_gpio_to_rdev;
2428 }
2429 }
2430
467bf301
MM		 2431 if (new_pin == NULL) {
2432 mutex_unlock(&regulator_list_mutex);
f19b00da 2433 return -ENOMEM;
467bf301
MM		 2434 }
2435
2436 pin = new_pin;
2437 new_pin = NULL;
f19b00da 2438
778b28b4 2439 pin->gpiod = gpiod;
f19b00da
KM		 2440 list_add(&pin->list, &regulator_ena_gpio_list);
2441
2442update_ena_gpio_to_rdev:
2443 pin->request_count++;
2444 rdev->ena_pin = pin;
467bf301
MM		 2445
2446 mutex_unlock(&regulator_list_mutex);
2447 kfree(new_pin);
2448
f19b00da
KM		 2449 return 0;
2450}
2451
2452static void regulator_ena_gpio_free(struct regulator_dev *rdev)
2453{
2454 struct regulator_enable_gpio *pin, *n;
2455
2456 if (!rdev->ena_pin)
2457 return;
2458
2459 /* Free the GPIO only in case of no use */
2460 list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
2dbf0855
MM		 2461 if (pin != rdev->ena_pin)
2462 continue;
2463
2464 if (--pin->request_count)
2465 break;
2466
2467 gpiod_put(pin->gpiod);
2468 list_del(&pin->list);
2469 kfree(pin);
2470 break;
f19b00da 2471 }
2dbf0855
MM		 2472
2473 rdev->ena_pin = NULL;
f19b00da
KM		 2474}
2475
967cfb18 2476/**
31d6eebf
RD		 2477 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
2478 * @rdev: regulator_dev structure
2479 * @enable: enable GPIO at initial use?
2480 *
967cfb18
KM		 2481 * GPIO is enabled in case of initial use. (enable_count is 0)
2482 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2483 */
2484static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
2485{
2486 struct regulator_enable_gpio *pin = rdev->ena_pin;
2487
2488 if (!pin)
2489 return -EINVAL;
2490
2491 if (enable) {
2492 /* Enable GPIO at initial use */
2493 if (pin->enable_count == 0)
01dc79cd 2494 gpiod_set_value_cansleep(pin->gpiod, 1);
967cfb18
KM		 2495
2496 pin->enable_count++;
2497 } else {
2498 if (pin->enable_count > 1) {
2499 pin->enable_count--;
2500 return 0;
2501 }
2502
2503 /* Disable GPIO if not used */
2504 if (pin->enable_count <= 1) {
01dc79cd 2505 gpiod_set_value_cansleep(pin->gpiod, 0);
967cfb18
KM		 2506 pin->enable_count = 0;
2507 }
2508 }
2509
2510 return 0;
2511}
2512
79fd1141
GX		 2513/**
2514 * _regulator_enable_delay - a delay helper function
2515 * @delay: time to delay in microseconds
2516 *
2517 * Delay for the requested amount of time as per the guidelines in:
2518 *
458f69ef 2519 * Documentation/timers/timers-howto.rst
79fd1141
GX		 2520 *
2521 * The assumption here is that regulators will never be enabled in
2522 * atomic context and therefore sleeping functions can be used.
2523 */
2524static void _regulator_enable_delay(unsigned int delay)
2525{
2526 unsigned int ms = delay / 1000;
2527 unsigned int us = delay % 1000;
2528
2529 if (ms > 0) {
2530 /*
2531 * For small enough values, handle super-millisecond
2532 * delays in the usleep_range() call below.
2533 */
2534 if (ms < 20)
2535 us += ms * 1000;
2536 else
2537 msleep(ms);
2538 }
2539
2540 /*
2541 * Give the scheduler some room to coalesce with any other
2542 * wakeup sources. For delays shorter than 10 us, don't even
2543 * bother setting up high-resolution timers and just busy-
2544 * loop.
2545 */
2546 if (us >= 10)
2547 usleep_range(us, us + 100);
2548 else
2549 udelay(us);
2550}
2551
f7d7ad42
SS		 2552/**
2553 * _regulator_check_status_enabled
2554 *
2555 * A helper function to check if the regulator status can be interpreted
2556 * as 'regulator is enabled'.
2557 * @rdev: the regulator device to check
2558 *
2559 * Return:
2560 * * 1 - if status shows regulator is in enabled state
2561 * * 0 - if not enabled state
2562 * * Error Value - as received from ops->get_status()
2563 */
2564static inline int _regulator_check_status_enabled(struct regulator_dev *rdev)
2565{
2566 int ret = rdev->desc->ops->get_status(rdev);
2567
2568 if (ret < 0) {
2569 rdev_info(rdev, "get_status returned error: %d\n", ret);
2570 return ret;
2571 }
2572
2573 switch (ret) {
2574 case REGULATOR_STATUS_OFF:
2575 case REGULATOR_STATUS_ERROR:
2576 case REGULATOR_STATUS_UNDEFINED:
2577 return 0;
2578 default:
2579 return 1;
2580 }
2581}
2582
5c5659d0
MB		 2583static int _regulator_do_enable(struct regulator_dev *rdev)
2584{
2585 int ret, delay;
2586
2587 /* Query before enabling in case configuration dependent. */
2588 ret = _regulator_get_enable_time(rdev);
2589 if (ret >= 0) {
2590 delay = ret;
2591 } else {
61aab5ad 2592 rdev_warn(rdev, "enable_time() failed: %pe\n", ERR_PTR(ret));
5c5659d0
MB		 2593 delay = 0;
2594 }
2595
2596 trace_regulator_enable(rdev_get_name(rdev));
2597
a8ce7bd8 2598 if (rdev->desc->off_on_delay && rdev->last_off) {
871f5650
GX		 2599 /* if needed, keep a distance of off_on_delay from last time
2600 * this regulator was disabled.
2601 */
a8ce7bd8
VW		 2602 ktime_t end = ktime_add_us(rdev->last_off, rdev->desc->off_on_delay);
2603 s64 remaining = ktime_us_delta(end, ktime_get());
2604
2605 if (remaining > 0)
2606 _regulator_enable_delay(remaining);
871f5650
GX		 2607 }
2608
967cfb18 2609 if (rdev->ena_pin) {
29d62ec5
DA		 2610 if (!rdev->ena_gpio_state) {
2611 ret = regulator_ena_gpio_ctrl(rdev, true);
2612 if (ret < 0)
2613 return ret;
2614 rdev->ena_gpio_state = 1;
2615 }
65f73508 2616 } else if (rdev->desc->ops->enable) {
5c5659d0
MB		 2617 ret = rdev->desc->ops->enable(rdev);
2618 if (ret < 0)
2619 return ret;
2620 } else {
2621 return -EINVAL;
2622 }
2623
2624 /* Allow the regulator to ramp; it would be useful to extend
2625 * this for bulk operations so that the regulators can ramp
69b8821e
SK		 2626 * together.
2627 */
5c5659d0
MB		 2628 trace_regulator_enable_delay(rdev_get_name(rdev));
2629
f7d7ad42
SS		 2630 /* If poll_enabled_time is set, poll upto the delay calculated
2631 * above, delaying poll_enabled_time uS to check if the regulator
2632 * actually got enabled.
2633 * If the regulator isn't enabled after enable_delay has
2634 * expired, return -ETIMEDOUT.
2635 */
2636 if (rdev->desc->poll_enabled_time) {
2637 unsigned int time_remaining = delay;
2638
2639 while (time_remaining > 0) {
2640 _regulator_enable_delay(rdev->desc->poll_enabled_time);
2641
2642 if (rdev->desc->ops->get_status) {
2643 ret = _regulator_check_status_enabled(rdev);
2644 if (ret < 0)
2645 return ret;
2646 else if (ret)
2647 break;
2648 } else if (rdev->desc->ops->is_enabled(rdev))
2649 break;
2650
2651 time_remaining -= rdev->desc->poll_enabled_time;
2652 }
2653
2654 if (time_remaining <= 0) {
2655 rdev_err(rdev, "Enabled check timed out\n");
2656 return -ETIMEDOUT;
2657 }
2658 } else {
2659 _regulator_enable_delay(delay);
2660 }
5c5659d0
MB		 2661
2662 trace_regulator_enable_complete(rdev_get_name(rdev));
2663
2664 return 0;
2665}
2666
5451781d
DA		 2667/**
2668 * _regulator_handle_consumer_enable - handle that a consumer enabled
2669 * @regulator: regulator source
2670 *
2671 * Some things on a regulator consumer (like the contribution towards total
2672 * load on the regulator) only have an effect when the consumer wants the
2673 * regulator enabled. Explained in example with two consumers of the same
2674 * regulator:
2675 * consumer A: set_load(100); => total load = 0
2676 * consumer A: regulator_enable(); => total load = 100
2677 * consumer B: set_load(1000); => total load = 100
2678 * consumer B: regulator_enable(); => total load = 1100
2679 * consumer A: regulator_disable(); => total_load = 1000
2680 *
2681 * This function (together with _regulator_handle_consumer_disable) is
2682 * responsible for keeping track of the refcount for a given regulator consumer
2683 * and applying / unapplying these things.
2684 *
2685 * Returns 0 upon no error; -error upon error.
2686 */
2687static int _regulator_handle_consumer_enable(struct regulator *regulator)
2688{
2689 struct regulator_dev *rdev = regulator->rdev;
2690
2691 lockdep_assert_held_once(&rdev->mutex.base);
2692
2693 regulator->enable_count++;
2694 if (regulator->uA_load && regulator->enable_count == 1)
2695 return drms_uA_update(rdev);
2696
2697 return 0;
2698}
2699
2700/**
2701 * _regulator_handle_consumer_disable - handle that a consumer disabled
2702 * @regulator: regulator source
2703 *
2704 * The opposite of _regulator_handle_consumer_enable().
2705 *
2706 * Returns 0 upon no error; -error upon error.
2707 */
2708static int _regulator_handle_consumer_disable(struct regulator *regulator)
2709{
2710 struct regulator_dev *rdev = regulator->rdev;
2711
2712 lockdep_assert_held_once(&rdev->mutex.base);
2713
2714 if (!regulator->enable_count) {
2715 rdev_err(rdev, "Underflow of regulator enable count\n");
2716 return -EINVAL;
2717 }
2718
2719 regulator->enable_count--;
2720 if (regulator->uA_load && regulator->enable_count == 0)
2721 return drms_uA_update(rdev);
2722
2723 return 0;
2724}
2725
414c70cb 2726/* locks held by regulator_enable() */
5451781d 2727static int _regulator_enable(struct regulator *regulator)
414c70cb 2728{
5451781d 2729 struct regulator_dev *rdev = regulator->rdev;
5c5659d0 2730 int ret;
414c70cb 2731
f8702f9e
DO		 2732 lockdep_assert_held_once(&rdev->mutex.base);
2733
1fc12b05 2734 if (rdev->use_count == 0 && rdev->supply) {
5451781d 2735 ret = _regulator_enable(rdev->supply);
f8702f9e
DO		 2736 if (ret < 0)
2737 return ret;
2738 }
2739
2740 /* balance only if there are regulators coupled */
2741 if (rdev->coupling_desc.n_coupled > 1) {
2742 ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
2743 if (ret < 0)
2744 goto err_disable_supply;
2745 }
70cfef26 2746
5451781d
DA		 2747 ret = _regulator_handle_consumer_enable(regulator);
2748 if (ret < 0)
2749 goto err_disable_supply;
414c70cb 2750
9a2372fa 2751 if (rdev->use_count == 0) {
72241e31
SF		 2752 /*
2753 * The regulator may already be enabled if it's not switchable
2754 * or was left on
2755 */
9a2372fa
MB		 2756 ret = _regulator_is_enabled(rdev);
2757 if (ret == -EINVAL || ret == 0) {
8a34e979 2758 if (!regulator_ops_is_valid(rdev,
f8702f9e
DO		 2759 REGULATOR_CHANGE_STATUS)) {
2760 ret = -EPERM;
5451781d 2761 goto err_consumer_disable;
f8702f9e 2762 }
9a2372fa 2763
5c5659d0 2764 ret = _regulator_do_enable(rdev);
31aae2be 2765 if (ret < 0)
5451781d 2766 goto err_consumer_disable;
31aae2be 2767
264b88c9
HG		 2768 _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE,
2769 NULL);
a7433cff 2770 } else if (ret < 0) {
61aab5ad 2771 rdev_err(rdev, "is_enabled() failed: %pe\n", ERR_PTR(ret));
5451781d 2772 goto err_consumer_disable;
414c70cb 2773 }
a7433cff 2774 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 2775 }
2776
9a2372fa
MB		 2777 rdev->use_count++;
2778
2779 return 0;
f8702f9e 2780
5451781d
DA		 2781err_consumer_disable:
2782 _regulator_handle_consumer_disable(regulator);
2783
f8702f9e 2784err_disable_supply:
1fc12b05 2785 if (rdev->use_count == 0 && rdev->supply)
5451781d 2786 _regulator_disable(rdev->supply);
f8702f9e
DO		 2787
2788 return ret;
414c70cb
LG		 2789}
2790
2791/**
2792 * regulator_enable - enable regulator output
2793 * @regulator: regulator source
2794 *
cf7bbcdf
MB		 2795 * Request that the regulator be enabled with the regulator output at
2796 * the predefined voltage or current value. Calls to regulator_enable()
2797 * must be balanced with calls to regulator_disable().
2798 *
414c70cb 2799 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 2800 * hardwired in the regulator.
414c70cb
LG		 2801 */
2802int regulator_enable(struct regulator *regulator)
2803{
412aec61 2804 struct regulator_dev *rdev = regulator->rdev;
f8702f9e 2805 struct ww_acquire_ctx ww_ctx;
5451781d 2806 int ret;
6492bc1b 2807
f8702f9e 2808 regulator_lock_dependent(rdev, &ww_ctx);
5451781d 2809 ret = _regulator_enable(regulator);
f8702f9e 2810 regulator_unlock_dependent(rdev, &ww_ctx);
3801b86a 2811
414c70cb
LG		 2812 return ret;
2813}
2814EXPORT_SYMBOL_GPL(regulator_enable);
2815
5c5659d0
MB		 2816static int _regulator_do_disable(struct regulator_dev *rdev)
2817{
2818 int ret;
2819
2820 trace_regulator_disable(rdev_get_name(rdev));
2821
967cfb18 2822 if (rdev->ena_pin) {
29d62ec5
DA		 2823 if (rdev->ena_gpio_state) {
2824 ret = regulator_ena_gpio_ctrl(rdev, false);
2825 if (ret < 0)
2826 return ret;
2827 rdev->ena_gpio_state = 0;
2828 }
5c5659d0
MB		 2829
2830 } else if (rdev->desc->ops->disable) {
2831 ret = rdev->desc->ops->disable(rdev);
2832 if (ret != 0)
2833 return ret;
2834 }
2835
871f5650 2836 if (rdev->desc->off_on_delay)
a8ce7bd8 2837 rdev->last_off = ktime_get();
871f5650 2838
5c5659d0
MB		 2839 trace_regulator_disable_complete(rdev_get_name(rdev));
2840
5c5659d0
MB		 2841 return 0;
2842}
2843
414c70cb 2844/* locks held by regulator_disable() */
5451781d 2845static int _regulator_disable(struct regulator *regulator)
414c70cb 2846{
5451781d 2847 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 2848 int ret = 0;
2849
f8702f9e 2850 lockdep_assert_held_once(&rdev->mutex.base);
70cfef26 2851
cd94b505 2852 if (WARN(rdev->use_count <= 0,
43e7ee33 2853 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 2854 return -EIO;
2855
414c70cb 2856 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 2857 if (rdev->use_count == 1 &&
2858 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 2859
2860 /* we are last user */
8a34e979 2861 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
a1c8a551
RF		 2862 ret = _notifier_call_chain(rdev,
2863 REGULATOR_EVENT_PRE_DISABLE,
2864 NULL);
2865 if (ret & NOTIFY_STOP_MASK)
2866 return -EINVAL;
2867
5c5659d0 2868 ret = _regulator_do_disable(rdev);
414c70cb 2869 if (ret < 0) {
61aab5ad 2870 rdev_err(rdev, "failed to disable: %pe\n", ERR_PTR(ret));
a1c8a551
RF		 2871 _notifier_call_chain(rdev,
2872 REGULATOR_EVENT_ABORT_DISABLE,
2873 NULL);
414c70cb
LG		 2874 return ret;
2875 }
66fda75f
MP		 2876 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2877 NULL);
414c70cb
LG		 2878 }
2879
414c70cb
LG		 2880 rdev->use_count = 0;
2881 } else if (rdev->use_count > 1) {
414c70cb
LG		 2882 rdev->use_count--;
2883 }
3801b86a 2884
5451781d
DA		 2885 if (ret == 0)
2886 ret = _regulator_handle_consumer_disable(regulator);
2887
f8702f9e
DO		 2888 if (ret == 0 && rdev->coupling_desc.n_coupled > 1)
2889 ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
2890
1fc12b05 2891 if (ret == 0 && rdev->use_count == 0 && rdev->supply)
5451781d 2892 ret = _regulator_disable(rdev->supply);
f8702f9e 2893
414c70cb
LG		 2894 return ret;
2895}
2896
2897/**
2898 * regulator_disable - disable regulator output
2899 * @regulator: regulator source
2900 *
cf7bbcdf
MB		 2901 * Disable the regulator output voltage or current. Calls to
2902 * regulator_enable() must be balanced with calls to
2903 * regulator_disable().
69279fb9 2904 *
414c70cb 2905 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 2906 * devices have it enabled, the regulator device supports disabling and
2907 * machine constraints permit this operation.
414c70cb
LG		 2908 */
2909int regulator_disable(struct regulator *regulator)
2910{
412aec61 2911 struct regulator_dev *rdev = regulator->rdev;
f8702f9e 2912 struct ww_acquire_ctx ww_ctx;
5451781d 2913 int ret;
6492bc1b 2914
f8702f9e 2915 regulator_lock_dependent(rdev, &ww_ctx);
5451781d 2916 ret = _regulator_disable(regulator);
f8702f9e 2917 regulator_unlock_dependent(rdev, &ww_ctx);
8cbf811d 2918
414c70cb
LG		 2919 return ret;
2920}
2921EXPORT_SYMBOL_GPL(regulator_disable);
2922
2923/* locks held by regulator_force_disable() */
3801b86a 2924static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 2925{
2926 int ret = 0;
2927
f8702f9e 2928 lockdep_assert_held_once(&rdev->mutex.base);
70cfef26 2929
a1c8a551
RF		 2930 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2931 REGULATOR_EVENT_PRE_DISABLE, NULL);
2932 if (ret & NOTIFY_STOP_MASK)
2933 return -EINVAL;
2934
66fda75f
MP		 2935 ret = _regulator_do_disable(rdev);
2936 if (ret < 0) {
61aab5ad 2937 rdev_err(rdev, "failed to force disable: %pe\n", ERR_PTR(ret));
a1c8a551
RF		 2938 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2939 REGULATOR_EVENT_ABORT_DISABLE, NULL);
66fda75f 2940 return ret;
414c70cb
LG		 2941 }
2942
66fda75f
MP		 2943 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2944 REGULATOR_EVENT_DISABLE, NULL);
2945
2946 return 0;
414c70cb
LG		 2947}
2948
2949/**
2950 * regulator_force_disable - force disable regulator output
2951 * @regulator: regulator source
2952 *
2953 * Forcibly disable the regulator output voltage or current.
2954 * NOTE: this *will* disable the regulator output even if other consumer
2955 * devices have it enabled. This should be used for situations when device
2956 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2957 */
2958int regulator_force_disable(struct regulator *regulator)
2959{
82d15839 2960 struct regulator_dev *rdev = regulator->rdev;
f8702f9e 2961 struct ww_acquire_ctx ww_ctx;
414c70cb
LG		 2962 int ret;
2963
f8702f9e 2964 regulator_lock_dependent(rdev, &ww_ctx);
5451781d 2965
3801b86a 2966 ret = _regulator_force_disable(regulator->rdev);
5451781d 2967
9243a195
MP		 2968 if (rdev->coupling_desc.n_coupled > 1)
2969 regulator_balance_voltage(rdev, PM_SUSPEND_ON);
5451781d
DA		 2970
2971 if (regulator->uA_load) {
2972 regulator->uA_load = 0;
2973 ret = drms_uA_update(rdev);
2974 }
2975
1fc12b05
DA		 2976 if (rdev->use_count != 0 && rdev->supply)
2977 _regulator_disable(rdev->supply);
8cbf811d 2978
1fc12b05 2979 regulator_unlock_dependent(rdev, &ww_ctx);
8cbf811d 2980
414c70cb
LG		 2981 return ret;
2982}
2983EXPORT_SYMBOL_GPL(regulator_force_disable);
2984
da07ecd9
MB		 2985static void regulator_disable_work(struct work_struct *work)
2986{
2987 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2988 disable_work.work);
f8702f9e 2989 struct ww_acquire_ctx ww_ctx;
da07ecd9 2990 int count, i, ret;
5451781d
DA		 2991 struct regulator *regulator;
2992 int total_count = 0;
da07ecd9 2993
f8702f9e 2994 regulator_lock_dependent(rdev, &ww_ctx);
da07ecd9 2995
c9ccaa0c
TR		 2996 /*
2997 * Workqueue functions queue the new work instance while the previous
2998 * work instance is being processed. Cancel the queued work instance
2999 * as the work instance under processing does the job of the queued
3000 * work instance.
3001 */
3002 cancel_delayed_work(&rdev->disable_work);
3003
5451781d
DA		 3004 list_for_each_entry(regulator, &rdev->consumer_list, list) {
3005 count = regulator->deferred_disables;
3006
3007 if (!count)
3008 continue;
3009
3010 total_count += count;
3011 regulator->deferred_disables = 0;
3012
3013 for (i = 0; i < count; i++) {
3014 ret = _regulator_disable(regulator);
3015 if (ret != 0)
61aab5ad
MM		 3016 rdev_err(rdev, "Deferred disable failed: %pe\n",
3017 ERR_PTR(ret));
5451781d 3018 }
da07ecd9 3019 }
5451781d 3020 WARN_ON(!total_count);
da07ecd9 3021
f8702f9e
DO		 3022 if (rdev->coupling_desc.n_coupled > 1)
3023 regulator_balance_voltage(rdev, PM_SUSPEND_ON);
3024
3025 regulator_unlock_dependent(rdev, &ww_ctx);
da07ecd9
MB		 3026}
3027
3028/**
3029 * regulator_disable_deferred - disable regulator output with delay
3030 * @regulator: regulator source
48f1b4ef 3031 * @ms: milliseconds until the regulator is disabled
da07ecd9
MB		 3032 *
3033 * Execute regulator_disable() on the regulator after a delay. This
3034 * is intended for use with devices that require some time to quiesce.
3035 *
3036 * NOTE: this will only disable the regulator output if no other consumer
3037 * devices have it enabled, the regulator device supports disabling and
3038 * machine constraints permit this operation.
3039 */
3040int regulator_disable_deferred(struct regulator *regulator, int ms)
3041{
3042 struct regulator_dev *rdev = regulator->rdev;
3043
2b5a24a0
MB		 3044 if (!ms)
3045 return regulator_disable(regulator);
3046
66cf9a7e 3047 regulator_lock(rdev);
5451781d 3048 regulator->deferred_disables++;
c9ccaa0c
TR		 3049 mod_delayed_work(system_power_efficient_wq, &rdev->disable_work,
3050 msecs_to_jiffies(ms));
66cf9a7e 3051 regulator_unlock(rdev);
da07ecd9 3052
70dc6daf 3053 return 0;
da07ecd9
MB		 3054}
3055EXPORT_SYMBOL_GPL(regulator_disable_deferred);
3056
414c70cb
LG		 3057static int _regulator_is_enabled(struct regulator_dev *rdev)
3058{
65f73508 3059 /* A GPIO control always takes precedence */
7b74d149 3060 if (rdev->ena_pin)
65f73508
MB		 3061 return rdev->ena_gpio_state;
3062
9a7f6a4c 3063 /* If we don't know then assume that the regulator is always on */
9332546f 3064 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 3065 return 1;
414c70cb 3066
9332546f 3067 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 3068}
3069
3d67fe95
MP		 3070static int _regulator_list_voltage(struct regulator_dev *rdev,
3071 unsigned selector, int lock)
3a40cfc3 3072{
3a40cfc3
SH		 3073 const struct regulator_ops *ops = rdev->desc->ops;
3074 int ret;
3075
3076 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
3077 return rdev->desc->fixed_uV;
3078
3079 if (ops->list_voltage) {
3080 if (selector >= rdev->desc->n_voltages)
3081 return -EINVAL;
55cca739
CB		 3082 if (selector < rdev->desc->linear_min_sel)
3083 return 0;
3a40cfc3 3084 if (lock)
66cf9a7e 3085 regulator_lock(rdev);
3a40cfc3
SH		 3086 ret = ops->list_voltage(rdev, selector);
3087 if (lock)
66cf9a7e 3088 regulator_unlock(rdev);
fd086045 3089 } else if (rdev->is_switch && rdev->supply) {
3d67fe95
MP		 3090 ret = _regulator_list_voltage(rdev->supply->rdev,
3091 selector, lock);
3a40cfc3
SH		 3092 } else {
3093 return -EINVAL;
3094 }
3095
3096 if (ret > 0) {
3097 if (ret < rdev->constraints->min_uV)
3098 ret = 0;
3099 else if (ret > rdev->constraints->max_uV)
3100 ret = 0;
3101 }
3102
3103 return ret;
3104}
3105
414c70cb
LG		 3106/**
3107 * regulator_is_enabled - is the regulator output enabled
3108 * @regulator: regulator source
3109 *
412aec61
DB		 3110 * Returns positive if the regulator driver backing the source/client
3111 * has requested that the device be enabled, zero if it hasn't, else a
3112 * negative errno code.
3113 *
3114 * Note that the device backing this regulator handle can have multiple
3115 * users, so it might be enabled even if regulator_enable() was never
3116 * called for this particular source.
414c70cb
LG		 3117 */
3118int regulator_is_enabled(struct regulator *regulator)
3119{
9332546f
MB		 3120 int ret;
3121
6492bc1b
MB		 3122 if (regulator->always_on)
3123 return 1;
3124
f8702f9e 3125 regulator_lock(regulator->rdev);
9332546f 3126 ret = _regulator_is_enabled(regulator->rdev);
f8702f9e 3127 regulator_unlock(regulator->rdev);
9332546f
MB		 3128
3129 return ret;
414c70cb
LG		 3130}
3131EXPORT_SYMBOL_GPL(regulator_is_enabled);
3132
4367cfdc
DB		 3133/**
3134 * regulator_count_voltages - count regulator_list_voltage() selectors
3135 * @regulator: regulator source
3136 *
3137 * Returns number of selectors, or negative errno. Selectors are
3138 * numbered starting at zero, and typically correspond to bitfields
3139 * in hardware registers.
3140 */
3141int regulator_count_voltages(struct regulator *regulator)
3142{
3143 struct regulator_dev *rdev = regulator->rdev;
3144
26988efe
JMC		 3145 if (rdev->desc->n_voltages)
3146 return rdev->desc->n_voltages;
3147
fd086045 3148 if (!rdev->is_switch || !rdev->supply)
26988efe
JMC		 3149 return -EINVAL;
3150
3151 return regulator_count_voltages(rdev->supply);
4367cfdc
DB		 3152}
3153EXPORT_SYMBOL_GPL(regulator_count_voltages);
3154
3155/**
3156 * regulator_list_voltage - enumerate supported voltages
3157 * @regulator: regulator source
3158 * @selector: identify voltage to list
3159 * Context: can sleep
3160 *
3161 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 3162 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 3163 * negative errno.
3164 */
3165int regulator_list_voltage(struct regulator *regulator, unsigned selector)
3166{
3d67fe95 3167 return _regulator_list_voltage(regulator->rdev, selector, 1);
4367cfdc
DB		 3168}
3169EXPORT_SYMBOL_GPL(regulator_list_voltage);
3170
04eca28c
TT		 3171/**
3172 * regulator_get_regmap - get the regulator's register map
3173 * @regulator: regulator source
3174 *
3175 * Returns the register map for the given regulator, or an ERR_PTR value
3176 * if the regulator doesn't use regmap.
3177 */
3178struct regmap *regulator_get_regmap(struct regulator *regulator)
3179{
3180 struct regmap *map = regulator->rdev->regmap;
3181
3182 return map ? map : ERR_PTR(-EOPNOTSUPP);
3183}
3184
3185/**
3186 * regulator_get_hardware_vsel_register - get the HW voltage selector register
3187 * @regulator: regulator source
3188 * @vsel_reg: voltage selector register, output parameter
3189 * @vsel_mask: mask for voltage selector bitfield, output parameter
3190 *
3191 * Returns the hardware register offset and bitmask used for setting the
3192 * regulator voltage. This might be useful when configuring voltage-scaling
3193 * hardware or firmware that can make I2C requests behind the kernel's back,
3194 * for example.
3195 *
3196 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
3197 * and 0 is returned, otherwise a negative errno is returned.
3198 */
3199int regulator_get_hardware_vsel_register(struct regulator *regulator,
3200 unsigned *vsel_reg,
3201 unsigned *vsel_mask)
3202{
39f5460d
GX		 3203 struct regulator_dev *rdev = regulator->rdev;
3204 const struct regulator_ops *ops = rdev->desc->ops;
04eca28c
TT		 3205
3206 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
3207 return -EOPNOTSUPP;
3208
0d5c8633
CIK		 3209 *vsel_reg = rdev->desc->vsel_reg;
3210 *vsel_mask = rdev->desc->vsel_mask;
04eca28c 3211
be35cc46 3212 return 0;
04eca28c
TT		 3213}
3214EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
3215
3216/**
3217 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
3218 * @regulator: regulator source
3219 * @selector: identify voltage to list
3220 *
3221 * Converts the selector to a hardware-specific voltage selector that can be
3222 * directly written to the regulator registers. The address of the voltage
3223 * register can be determined by calling @regulator_get_hardware_vsel_register.
3224 *
3225 * On error a negative errno is returned.
3226 */
3227int regulator_list_hardware_vsel(struct regulator *regulator,
3228 unsigned selector)
3229{
39f5460d
GX		 3230 struct regulator_dev *rdev = regulator->rdev;
3231 const struct regulator_ops *ops = rdev->desc->ops;
04eca28c
TT		 3232
3233 if (selector >= rdev->desc->n_voltages)
3234 return -EINVAL;
55cca739
CB		 3235 if (selector < rdev->desc->linear_min_sel)
3236 return 0;
04eca28c
TT		 3237 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
3238 return -EOPNOTSUPP;
3239
3240 return selector;
3241}
3242EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
3243
2a668a8b
PW		 3244/**
3245 * regulator_get_linear_step - return the voltage step size between VSEL values
3246 * @regulator: regulator source
3247 *
3248 * Returns the voltage step size between VSEL values for linear
3249 * regulators, or return 0 if the regulator isn't a linear regulator.
3250 */
3251unsigned int regulator_get_linear_step(struct regulator *regulator)
3252{
3253 struct regulator_dev *rdev = regulator->rdev;
3254
3255 return rdev->desc->uV_step;
3256}
3257EXPORT_SYMBOL_GPL(regulator_get_linear_step);
3258
a7a1ad90
MB		 3259/**
3260 * regulator_is_supported_voltage - check if a voltage range can be supported
3261 *
3262 * @regulator: Regulator to check.
3263 * @min_uV: Minimum required voltage in uV.
3264 * @max_uV: Maximum required voltage in uV.
3265 *
49820944 3266 * Returns a boolean.
a7a1ad90
MB		 3267 */
3268int regulator_is_supported_voltage(struct regulator *regulator,
3269 int min_uV, int max_uV)
3270{
c5f3939b 3271 struct regulator_dev *rdev = regulator->rdev;
a7a1ad90
MB		 3272 int i, voltages, ret;
3273
c5f3939b 3274 /* If we can't change voltage check the current voltage */
8a34e979 3275 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
c5f3939b
MB		 3276 ret = regulator_get_voltage(regulator);
3277 if (ret >= 0)
0d25d09d 3278 return min_uV <= ret && ret <= max_uV;
c5f3939b
MB		 3279 else
3280 return ret;
3281 }
3282
bd7a2b60
PM		 3283 /* Any voltage within constrains range is fine? */
3284 if (rdev->desc->continuous_voltage_range)
3285 return min_uV >= rdev->constraints->min_uV &&
3286 max_uV <= rdev->constraints->max_uV;
3287
a7a1ad90
MB		 3288 ret = regulator_count_voltages(regulator);
3289 if (ret < 0)
49820944 3290 return 0;
a7a1ad90
MB		 3291 voltages = ret;
3292
3293 for (i = 0; i < voltages; i++) {
3294 ret = regulator_list_voltage(regulator, i);
3295
3296 if (ret >= min_uV && ret <= max_uV)
3297 return 1;
3298 }
3299
3300 return 0;
3301}
a398eaa2 3302EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 3303
a204f41e
SH		 3304static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
3305 int max_uV)
3306{
3307 const struct regulator_desc *desc = rdev->desc;
3308
3309 if (desc->ops->map_voltage)
3310 return desc->ops->map_voltage(rdev, min_uV, max_uV);
3311
3312 if (desc->ops->list_voltage == regulator_list_voltage_linear)
3313 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
3314
3315 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
3316 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
3317
18e4b55f
MV		 3318 if (desc->ops->list_voltage ==
3319 regulator_list_voltage_pickable_linear_range)
3320 return regulator_map_voltage_pickable_linear_range(rdev,
3321 min_uV, max_uV);
3322
a204f41e
SH		 3323 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
3324}
3325
7179569a
HS		 3326static int _regulator_call_set_voltage(struct regulator_dev *rdev,
3327 int min_uV, int max_uV,
3328 unsigned *selector)
3329{
3330 struct pre_voltage_change_data data;
3331 int ret;
3332
d22b85a1 3333 data.old_uV = regulator_get_voltage_rdev(rdev);
7179569a
HS		 3334 data.min_uV = min_uV;
3335 data.max_uV = max_uV;
3336 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
3337 &data);
3338 if (ret & NOTIFY_STOP_MASK)
3339 return -EINVAL;
3340
3341 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
3342 if (ret >= 0)
3343 return ret;
3344
3345 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
3346 (void *)data.old_uV);
3347
3348 return ret;
3349}
3350
3351static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
3352 int uV, unsigned selector)
3353{
3354 struct pre_voltage_change_data data;
3355 int ret;
3356
d22b85a1 3357 data.old_uV = regulator_get_voltage_rdev(rdev);
7179569a
HS		 3358 data.min_uV = uV;
3359 data.max_uV = uV;
3360 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
3361 &data);
3362 if (ret & NOTIFY_STOP_MASK)
3363 return -EINVAL;
3364
3365 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
3366 if (ret >= 0)
3367 return ret;
3368
3369 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
3370 (void *)data.old_uV);
3371
3372 return ret;
3373}
3374
2da8d947
BG		 3375static int _regulator_set_voltage_sel_step(struct regulator_dev *rdev,
3376 int uV, int new_selector)
3377{
3378 const struct regulator_ops *ops = rdev->desc->ops;
3379 int diff, old_sel, curr_sel, ret;
3380
3381 /* Stepping is only needed if the regulator is enabled. */
3382 if (!_regulator_is_enabled(rdev))
3383 goto final_set;
3384
3385 if (!ops->get_voltage_sel)
3386 return -EINVAL;
3387
3388 old_sel = ops->get_voltage_sel(rdev);
3389 if (old_sel < 0)
3390 return old_sel;
3391
3392 diff = new_selector - old_sel;
3393 if (diff == 0)
3394 return 0; /* No change needed. */
3395
3396 if (diff > 0) {
3397 /* Stepping up. */
3398 for (curr_sel = old_sel + rdev->desc->vsel_step;
3399 curr_sel < new_selector;
3400 curr_sel += rdev->desc->vsel_step) {
3401 /*
3402 * Call the callback directly instead of using
3403 * _regulator_call_set_voltage_sel() as we don't
3404 * want to notify anyone yet. Same in the branch
3405 * below.
3406 */
3407 ret = ops->set_voltage_sel(rdev, curr_sel);
3408 if (ret)
3409 goto try_revert;
3410 }
3411 } else {
3412 /* Stepping down. */
3413 for (curr_sel = old_sel - rdev->desc->vsel_step;
3414 curr_sel > new_selector;
3415 curr_sel -= rdev->desc->vsel_step) {
3416 ret = ops->set_voltage_sel(rdev, curr_sel);
3417 if (ret)
3418 goto try_revert;
3419 }
3420 }
3421
3422final_set:
3423 /* The final selector will trigger the notifiers. */
3424 return _regulator_call_set_voltage_sel(rdev, uV, new_selector);
3425
3426try_revert:
3427 /*
3428 * At least try to return to the previous voltage if setting a new
3429 * one failed.
3430 */
3431 (void)ops->set_voltage_sel(rdev, old_sel);
3432 return ret;
3433}
3434
73e705bf
MK		 3435static int _regulator_set_voltage_time(struct regulator_dev *rdev,
3436 int old_uV, int new_uV)
3437{
3438 unsigned int ramp_delay = 0;
3439
3440 if (rdev->constraints->ramp_delay)
3441 ramp_delay = rdev->constraints->ramp_delay;
3442 else if (rdev->desc->ramp_delay)
3443 ramp_delay = rdev->desc->ramp_delay;
d6c1dc3f
LD		 3444 else if (rdev->constraints->settling_time)
3445 return rdev->constraints->settling_time;
3ffad468
MK		 3446 else if (rdev->constraints->settling_time_up &&
3447 (new_uV > old_uV))
3448 return rdev->constraints->settling_time_up;
3449 else if (rdev->constraints->settling_time_down &&
3450 (new_uV < old_uV))
3451 return rdev->constraints->settling_time_down;
73e705bf
MK		 3452
3453 if (ramp_delay == 0) {
ba14fa1a 3454 rdev_dbg(rdev, "ramp_delay not set\n");
73e705bf
MK		 3455 return 0;
3456 }
3457
3458 return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
3459}
3460
75790251
MB		 3461static int _regulator_do_set_voltage(struct regulator_dev *rdev,
3462 int min_uV, int max_uV)
3463{
3464 int ret;
77af1b26 3465 int delay = 0;
e113d792 3466 int best_val = 0;
75790251 3467 unsigned int selector;
eba41a5e 3468 int old_selector = -1;
57995a48 3469 const struct regulator_ops *ops = rdev->desc->ops;
d22b85a1 3470 int old_uV = regulator_get_voltage_rdev(rdev);
75790251
MB		 3471
3472 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
3473
bf5892a8
MB		 3474 min_uV += rdev->constraints->uV_offset;
3475 max_uV += rdev->constraints->uV_offset;
3476
eba41a5e
AL		 3477 /*
3478 * If we can't obtain the old selector there is not enough
3479 * info to call set_voltage_time_sel().
3480 */
8b7485ef 3481 if (_regulator_is_enabled(rdev) &&
57995a48
MK		 3482 ops->set_voltage_time_sel && ops->get_voltage_sel) {
3483 old_selector = ops->get_voltage_sel(rdev);
eba41a5e
AL		 3484 if (old_selector < 0)
3485 return old_selector;
3486 }
3487
57995a48 3488 if (ops->set_voltage) {
7179569a
HS		 3489 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
3490 &selector);
e113d792
MB		 3491
3492 if (ret >= 0) {
57995a48
MK		 3493 if (ops->list_voltage)
3494 best_val = ops->list_voltage(rdev,
3495 selector);
e113d792 3496 else
d22b85a1 3497 best_val = regulator_get_voltage_rdev(rdev);
e113d792
MB		 3498 }
3499
57995a48 3500 } else if (ops->set_voltage_sel) {
a204f41e 3501 ret = regulator_map_voltage(rdev, min_uV, max_uV);
e843fc46 3502 if (ret >= 0) {
57995a48 3503 best_val = ops->list_voltage(rdev, ret);
e113d792
MB		 3504 if (min_uV <= best_val && max_uV >= best_val) {
3505 selector = ret;
c66a566a
AL		 3506 if (old_selector == selector)
3507 ret = 0;
2da8d947
BG		 3508 else if (rdev->desc->vsel_step)
3509 ret = _regulator_set_voltage_sel_step(
3510 rdev, best_val, selector);
c66a566a 3511 else
7179569a
HS		 3512 ret = _regulator_call_set_voltage_sel(
3513 rdev, best_val, selector);
e113d792
MB		 3514 } else {
3515 ret = -EINVAL;
3516 }
e8eef82b 3517 }
75790251
MB		 3518 } else {
3519 ret = -EINVAL;
3520 }
e8eef82b 3521
31dfe686
MK		 3522 if (ret)
3523 goto out;
77af1b26 3524
73e705bf
MK		 3525 if (ops->set_voltage_time_sel) {
3526 /*
3527 * Call set_voltage_time_sel if successfully obtained
3528 * old_selector
3529 */
3530 if (old_selector >= 0 && old_selector != selector)
3531 delay = ops->set_voltage_time_sel(rdev, old_selector,
3532 selector);
3533 } else {
3534 if (old_uV != best_val) {
3535 if (ops->set_voltage_time)
3536 delay = ops->set_voltage_time(rdev, old_uV,
3537 best_val);
3538 else
3539 delay = _regulator_set_voltage_time(rdev,
3540 old_uV,
3541 best_val);
e8eef82b 3542 }
73e705bf 3543 }
75790251 3544
73e705bf 3545 if (delay < 0) {
61aab5ad 3546 rdev_warn(rdev, "failed to get delay: %pe\n", ERR_PTR(delay));
73e705bf 3547 delay = 0;
77af1b26
LW		 3548 }
3549
73e705bf
MK		 3550 /* Insert any necessary delays */
3551 if (delay >= 1000) {
3552 mdelay(delay / 1000);
3553 udelay(delay % 1000);
3554 } else if (delay) {
3555 udelay(delay);
77af1b26
LW		 3556 }
3557
31dfe686 3558 if (best_val >= 0) {
2f6c797f
AL		 3559 unsigned long data = best_val;
3560
ded06a52 3561 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2f6c797f
AL		 3562 (void *)data);
3563 }
ded06a52 3564
31dfe686 3565out:
eba41a5e 3566 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
75790251
MB		 3567
3568 return ret;
3569}
3570
f7efad10
CZ		 3571static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev,
3572 int min_uV, int max_uV, suspend_state_t state)
3573{
3574 struct regulator_state *rstate;
3575 int uV, sel;
3576
3577 rstate = regulator_get_suspend_state(rdev, state);
3578 if (rstate == NULL)
3579 return -EINVAL;
3580
3581 if (min_uV < rstate->min_uV)
3582 min_uV = rstate->min_uV;
3583 if (max_uV > rstate->max_uV)
3584 max_uV = rstate->max_uV;
3585
3586 sel = regulator_map_voltage(rdev, min_uV, max_uV);
3587 if (sel < 0)
3588 return sel;
3589
3590 uV = rdev->desc->ops->list_voltage(rdev, sel);
3591 if (uV >= min_uV && uV <= max_uV)
3592 rstate->uV = uV;
3593
3594 return 0;
3595}
3596
a9f226bc 3597static int regulator_set_voltage_unlocked(struct regulator *regulator,
c360a6df
CZ		 3598 int min_uV, int max_uV,
3599 suspend_state_t state)
414c70cb
LG		 3600{
3601 struct regulator_dev *rdev = regulator->rdev;
c360a6df 3602 struct regulator_voltage *voltage = &regulator->voltage[state];
95a3c23a 3603 int ret = 0;
92d7a558 3604 int old_min_uV, old_max_uV;
c00dc359 3605 int current_uV;
414c70cb 3606
95a3c23a
MB		 3607 /* If we're setting the same range as last time the change
3608 * should be a noop (some cpufreq implementations use the same
3609 * voltage for multiple frequencies, for example).
3610 */
c360a6df 3611 if (voltage->min_uV == min_uV && voltage->max_uV == max_uV)
95a3c23a
MB		 3612 goto out;
3613
c00dc359 3614 /* If we're trying to set a range that overlaps the current voltage,
d3fb9800 3615 * return successfully even though the regulator does not support
c00dc359
BA		 3616 * changing the voltage.
3617 */
8a34e979 3618 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
d22b85a1 3619 current_uV = regulator_get_voltage_rdev(rdev);
c00dc359 3620 if (min_uV <= current_uV && current_uV <= max_uV) {
c360a6df
CZ		 3621 voltage->min_uV = min_uV;
3622 voltage->max_uV = max_uV;
c00dc359
BA		 3623 goto out;
3624 }
3625 }
3626
414c70cb 3627 /* sanity check */
e8eef82b
MB		 3628 if (!rdev->desc->ops->set_voltage &&
3629 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 3630 ret = -EINVAL;
3631 goto out;
3632 }
3633
3634 /* constraints check */
3635 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3636 if (ret < 0)
3637 goto out;
0d25d09d 3638
92d7a558 3639 /* restore original values in case of error */
c360a6df
CZ		 3640 old_min_uV = voltage->min_uV;
3641 old_max_uV = voltage->max_uV;
3642 voltage->min_uV = min_uV;
3643 voltage->max_uV = max_uV;
3a93f2a9 3644
9243a195
MP		 3645 /* for not coupled regulators this will just set the voltage */
3646 ret = regulator_balance_voltage(rdev, state);
70b46491
ST		 3647 if (ret < 0) {
3648 voltage->min_uV = old_min_uV;
3649 voltage->max_uV = old_max_uV;
3650 }
05fda3b1 3651
9243a195 3652out:
9243a195
MP		 3653 return ret;
3654}
3655
d22b85a1
DO		 3656int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV,
3657 int max_uV, suspend_state_t state)
9243a195
MP		 3658{
3659 int best_supply_uV = 0;
3660 int supply_change_uV = 0;
3661 int ret;
3662
43fc99f2
MB		 3663 if (rdev->supply &&
3664 regulator_ops_is_valid(rdev->supply->rdev,
3665 REGULATOR_CHANGE_VOLTAGE) &&
2c2874b1
TR		 3666 (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage ||
3667 rdev->desc->ops->get_voltage_sel))) {
fc42112c
SH		 3668 int current_supply_uV;
3669 int selector;
3670
3671 selector = regulator_map_voltage(rdev, min_uV, max_uV);
3672 if (selector < 0) {
3673 ret = selector;
9243a195 3674 goto out;
fc42112c
SH		 3675 }
3676
00cb9f4f 3677 best_supply_uV = _regulator_list_voltage(rdev, selector, 0);
fc42112c
SH		 3678 if (best_supply_uV < 0) {
3679 ret = best_supply_uV;
9243a195 3680 goto out;
fc42112c
SH		 3681 }
3682
3683 best_supply_uV += rdev->desc->min_dropout_uV;
3684
d22b85a1 3685 current_supply_uV = regulator_get_voltage_rdev(rdev->supply->rdev);
fc42112c
SH		 3686 if (current_supply_uV < 0) {
3687 ret = current_supply_uV;
9243a195 3688 goto out;
fc42112c
SH		 3689 }
3690
3691 supply_change_uV = best_supply_uV - current_supply_uV;
3692 }
3693
3694 if (supply_change_uV > 0) {
3695 ret = regulator_set_voltage_unlocked(rdev->supply,
c360a6df 3696 best_supply_uV, INT_MAX, state);
fc42112c 3697 if (ret) {
61aab5ad
MM		 3698 dev_err(&rdev->dev, "Failed to increase supply voltage: %pe\n",
3699 ERR_PTR(ret));
9243a195 3700 goto out;
fc42112c
SH		 3701 }
3702 }
3703
f7efad10
CZ		 3704 if (state == PM_SUSPEND_ON)
3705 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3706 else
3707 ret = _regulator_do_set_suspend_voltage(rdev, min_uV,
3708 max_uV, state);
92d7a558 3709 if (ret < 0)
9243a195 3710 goto out;
0d25d09d 3711
fc42112c
SH		 3712 if (supply_change_uV < 0) {
3713 ret = regulator_set_voltage_unlocked(rdev->supply,
c360a6df 3714 best_supply_uV, INT_MAX, state);
fc42112c 3715 if (ret)
61aab5ad
MM		 3716 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %pe\n",
3717 ERR_PTR(ret));
fc42112c
SH		 3718 /* No need to fail here */
3719 ret = 0;
3720 }
3721
414c70cb 3722out:
a9f226bc 3723 return ret;
69686176 3724}
3d7610e8 3725EXPORT_SYMBOL_GPL(regulator_set_voltage_rdev);
69686176 3726
85254bcf
DO		 3727static int regulator_limit_voltage_step(struct regulator_dev *rdev,
3728 int *current_uV, int *min_uV)
3729{
3730 struct regulation_constraints *constraints = rdev->constraints;
3731
3732 /* Limit voltage change only if necessary */
3733 if (!constraints->max_uV_step || !_regulator_is_enabled(rdev))
3734 return 1;
3735
3736 if (*current_uV < 0) {
d22b85a1 3737 *current_uV = regulator_get_voltage_rdev(rdev);
85254bcf
DO		 3738
3739 if (*current_uV < 0)
3740 return *current_uV;
3741 }
3742
3743 if (abs(*current_uV - *min_uV) <= constraints->max_uV_step)
3744 return 1;
3745
3746 /* Clamp target voltage within the given step */
3747 if (*current_uV < *min_uV)
3748 *min_uV = min(*current_uV + constraints->max_uV_step,
3749 *min_uV);
3750 else
3751 *min_uV = max(*current_uV - constraints->max_uV_step,
3752 *min_uV);
3753
3754 return 0;
3755}
3756
c054c6c7
MP		 3757static int regulator_get_optimal_voltage(struct regulator_dev *rdev,
3758 int *current_uV,
3759 int *min_uV, int *max_uV,
3760 suspend_state_t state,
3761 int n_coupled)
3762{
3763 struct coupling_desc *c_desc = &rdev->coupling_desc;
3764 struct regulator_dev **c_rdevs = c_desc->coupled_rdevs;
3765 struct regulation_constraints *constraints = rdev->constraints;
c054c6c7
MP		 3766 int desired_min_uV = 0, desired_max_uV = INT_MAX;
3767 int max_current_uV = 0, min_current_uV = INT_MAX;
3768 int highest_min_uV = 0, target_uV, possible_uV;
d8ca7d18 3769 int i, ret, max_spread;
c054c6c7
MP		 3770 bool done;
3771
3772 *current_uV = -1;
3773
3774 /*
3775 * If there are no coupled regulators, simply set the voltage
3776 * demanded by consumers.
3777 */
3778 if (n_coupled == 1) {
3779 /*
3780 * If consumers don't provide any demands, set voltage
3781 * to min_uV
3782 */
3783 desired_min_uV = constraints->min_uV;
3784 desired_max_uV = constraints->max_uV;
3785
3786 ret = regulator_check_consumers(rdev,
3787 &desired_min_uV,
3788 &desired_max_uV, state);
3789 if (ret < 0)
3790 return ret;
3791
3792 possible_uV = desired_min_uV;
3793 done = true;
3794
3795 goto finish;
3796 }
3797
3798 /* Find highest min desired voltage */
3799 for (i = 0; i < n_coupled; i++) {
3800 int tmp_min = 0;
3801 int tmp_max = INT_MAX;
3802
f8702f9e 3803 lockdep_assert_held_once(&c_rdevs[i]->mutex.base);
c054c6c7
MP		 3804
3805 ret = regulator_check_consumers(c_rdevs[i],
3806 &tmp_min,
3807 &tmp_max, state);
3808 if (ret < 0)
3809 return ret;
3810
3811 ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max);
3812 if (ret < 0)
3813 return ret;
69686176 3814
c054c6c7
MP		 3815 highest_min_uV = max(highest_min_uV, tmp_min);
3816
3817 if (i == 0) {
3818 desired_min_uV = tmp_min;
3819 desired_max_uV = tmp_max;
3820 }
3821 }
3822
d8ca7d18
DO		 3823 max_spread = constraints->max_spread[0];
3824
c054c6c7
MP		 3825 /*
3826 * Let target_uV be equal to the desired one if possible.
3827 * If not, set it to minimum voltage, allowed by other coupled
3828 * regulators.
3829 */
3830 target_uV = max(desired_min_uV, highest_min_uV - max_spread);
3831
3832 /*
3833 * Find min and max voltages, which currently aren't violating
3834 * max_spread.
3835 */
3836 for (i = 1; i < n_coupled; i++) {
3837 int tmp_act;
3838
3839 if (!_regulator_is_enabled(c_rdevs[i]))
3840 continue;
3841
d22b85a1 3842 tmp_act = regulator_get_voltage_rdev(c_rdevs[i]);
c054c6c7
MP		 3843 if (tmp_act < 0)
3844 return tmp_act;
3845
3846 min_current_uV = min(tmp_act, min_current_uV);
3847 max_current_uV = max(tmp_act, max_current_uV);
3848 }
3849
3850 /* There aren't any other regulators enabled */
3851 if (max_current_uV == 0) {
3852 possible_uV = target_uV;
3853 } else {
3854 /*
3855 * Correct target voltage, so as it currently isn't
3856 * violating max_spread
3857 */
3858 possible_uV = max(target_uV, max_current_uV - max_spread);
3859 possible_uV = min(possible_uV, min_current_uV + max_spread);
3860 }
3861
3862 if (possible_uV > desired_max_uV)
3863 return -EINVAL;
3864
3865 done = (possible_uV == target_uV);
3866 desired_min_uV = possible_uV;
3867
3868finish:
85254bcf
DO		 3869 /* Apply max_uV_step constraint if necessary */
3870 if (state == PM_SUSPEND_ON) {
3871 ret = regulator_limit_voltage_step(rdev, current_uV,
3872 &desired_min_uV);
3873 if (ret < 0)
3874 return ret;
3875
3876 if (ret == 0)
3877 done = false;
3878 }
3879
c054c6c7
MP		 3880 /* Set current_uV if wasn't done earlier in the code and if necessary */
3881 if (n_coupled > 1 && *current_uV == -1) {
3882
3883 if (_regulator_is_enabled(rdev)) {
d22b85a1 3884 ret = regulator_get_voltage_rdev(rdev);
c054c6c7
MP		 3885 if (ret < 0)
3886 return ret;
3887
3888 *current_uV = ret;
3889 } else {
3890 *current_uV = desired_min_uV;
3891 }
3892 }
3893
3894 *min_uV = desired_min_uV;
3895 *max_uV = desired_max_uV;
3896
3897 return done;
3898}
3899
752db83a
MS		 3900int regulator_do_balance_voltage(struct regulator_dev *rdev,
3901 suspend_state_t state, bool skip_coupled)
c054c6c7
MP		 3902{
3903 struct regulator_dev **c_rdevs;
3904 struct regulator_dev *best_rdev;
3905 struct coupling_desc *c_desc = &rdev->coupling_desc;
3906 int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev;
c054c6c7 3907 unsigned int delta, best_delta;
d8ca7d18
DO		 3908 unsigned long c_rdev_done = 0;
3909 bool best_c_rdev_done;
c054c6c7
MP		 3910
3911 c_rdevs = c_desc->coupled_rdevs;
752db83a 3912 n_coupled = skip_coupled ? 1 : c_desc->n_coupled;
c054c6c7
MP		 3913
3914 /*
3915 * Find the best possible voltage change on each loop. Leave the loop
3916 * if there isn't any possible change.
3917 */
3918 do {
3919 best_c_rdev_done = false;
3920 best_delta = 0;
3921 best_min_uV = 0;
3922 best_max_uV = 0;
3923 best_c_rdev = 0;
3924 best_rdev = NULL;
3925
3926 /*
3927 * Find highest difference between optimal voltage
3928 * and current voltage.
3929 */
3930 for (i = 0; i < n_coupled; i++) {
3931 /*
3932 * optimal_uV is the best voltage that can be set for
3933 * i-th regulator at the moment without violating
3934 * max_spread constraint in order to balance
3935 * the coupled voltages.
3936 */
3937 int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0;
3938
d8ca7d18 3939 if (test_bit(i, &c_rdev_done))
c054c6c7
MP		 3940 continue;
3941
3942 ret = regulator_get_optimal_voltage(c_rdevs[i],
3943 &current_uV,
3944 &optimal_uV,
3945 &optimal_max_uV,
3946 state, n_coupled);
3947 if (ret < 0)
3948 goto out;
3949
3950 delta = abs(optimal_uV - current_uV);
3951
3952 if (delta && best_delta <= delta) {
3953 best_c_rdev_done = ret;
3954 best_delta = delta;
3955 best_rdev = c_rdevs[i];
3956 best_min_uV = optimal_uV;
3957 best_max_uV = optimal_max_uV;
3958 best_c_rdev = i;
3959 }
3960 }
3961
3962 /* Nothing to change, return successfully */
3963 if (!best_rdev) {
3964 ret = 0;
3965 goto out;
3966 }
9243a195 3967
c054c6c7
MP		 3968 ret = regulator_set_voltage_rdev(best_rdev, best_min_uV,
3969 best_max_uV, state);
9243a195 3970
c054c6c7
MP		 3971 if (ret < 0)
3972 goto out;
3973
d8ca7d18
DO		 3974 if (best_c_rdev_done)
3975 set_bit(best_c_rdev, &c_rdev_done);
c054c6c7
MP		 3976
3977 } while (n_coupled > 1);
3978
3979out:
69686176
MP		 3980 return ret;
3981}
3982
752db83a
MS		 3983static int regulator_balance_voltage(struct regulator_dev *rdev,
3984 suspend_state_t state)
3985{
3986 struct coupling_desc *c_desc = &rdev->coupling_desc;
3987 struct regulator_coupler *coupler = c_desc->coupler;
3988 bool skip_coupled = false;
3989
3990 /*
3991 * If system is in a state other than PM_SUSPEND_ON, don't check
3992 * other coupled regulators.
3993 */
3994 if (state != PM_SUSPEND_ON)
3995 skip_coupled = true;
3996
3997 if (c_desc->n_resolved < c_desc->n_coupled) {
3998 rdev_err(rdev, "Not all coupled regulators registered\n");
3999 return -EPERM;
4000 }
4001
4002 /* Invoke custom balancer for customized couplers */
4003 if (coupler && coupler->balance_voltage)
4004 return coupler->balance_voltage(coupler, rdev, state);
4005
4006 return regulator_do_balance_voltage(rdev, state, skip_coupled);
4007}
4008
a9f226bc
SH		 4009/**
4010 * regulator_set_voltage - set regulator output voltage
4011 * @regulator: regulator source
4012 * @min_uV: Minimum required voltage in uV
4013 * @max_uV: Maximum acceptable voltage in uV
4014 *
4015 * Sets a voltage regulator to the desired output voltage. This can be set
4016 * during any regulator state. IOW, regulator can be disabled or enabled.
4017 *
4018 * If the regulator is enabled then the voltage will change to the new value
4019 * immediately otherwise if the regulator is disabled the regulator will
4020 * output at the new voltage when enabled.
4021 *
4022 * NOTE: If the regulator is shared between several devices then the lowest
4023 * request voltage that meets the system constraints will be used.
4024 * Regulator system constraints must be set for this regulator before
4025 * calling this function otherwise this call will fail.
4026 */
4027int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
4028{
f8702f9e
DO		 4029 struct ww_acquire_ctx ww_ctx;
4030 int ret;
a9f226bc 4031
f8702f9e 4032 regulator_lock_dependent(regulator->rdev, &ww_ctx);
a9f226bc 4033
c360a6df
CZ		 4034 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV,
4035 PM_SUSPEND_ON);
a9f226bc 4036
f8702f9e 4037 regulator_unlock_dependent(regulator->rdev, &ww_ctx);
a9f226bc 4038
414c70cb
LG		 4039 return ret;
4040}
4041EXPORT_SYMBOL_GPL(regulator_set_voltage);
4042
f7efad10
CZ		 4043static inline int regulator_suspend_toggle(struct regulator_dev *rdev,
4044 suspend_state_t state, bool en)
4045{
4046 struct regulator_state *rstate;
4047
4048 rstate = regulator_get_suspend_state(rdev, state);
4049 if (rstate == NULL)
4050 return -EINVAL;
4051
4052 if (!rstate->changeable)
4053 return -EPERM;
4054
3edd79cf 4055 rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND;
f7efad10
CZ		 4056
4057 return 0;
4058}
4059
4060int regulator_suspend_enable(struct regulator_dev *rdev,
4061 suspend_state_t state)
4062{
4063 return regulator_suspend_toggle(rdev, state, true);
4064}
4065EXPORT_SYMBOL_GPL(regulator_suspend_enable);
4066
4067int regulator_suspend_disable(struct regulator_dev *rdev,
4068 suspend_state_t state)
4069{
4070 struct regulator *regulator;
4071 struct regulator_voltage *voltage;
4072
4073 /*
4074 * if any consumer wants this regulator device keeping on in
4075 * suspend states, don't set it as disabled.
4076 */
4077 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4078 voltage = &regulator->voltage[state];
4079 if (voltage->min_uV || voltage->max_uV)
4080 return 0;
4081 }
4082
4083 return regulator_suspend_toggle(rdev, state, false);
4084}
4085EXPORT_SYMBOL_GPL(regulator_suspend_disable);
4086
4087static int _regulator_set_suspend_voltage(struct regulator *regulator,
4088 int min_uV, int max_uV,
4089 suspend_state_t state)
4090{
4091 struct regulator_dev *rdev = regulator->rdev;
4092 struct regulator_state *rstate;
4093
4094 rstate = regulator_get_suspend_state(rdev, state);
4095 if (rstate == NULL)
4096 return -EINVAL;
4097
4098 if (rstate->min_uV == rstate->max_uV) {
4099 rdev_err(rdev, "The suspend voltage can't be changed!\n");
4100 return -EPERM;
4101 }
4102
4103 return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state);
4104}
4105
4106int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV,
4107 int max_uV, suspend_state_t state)
4108{
f8702f9e
DO		 4109 struct ww_acquire_ctx ww_ctx;
4110 int ret;
f7efad10
CZ		 4111
4112 /* PM_SUSPEND_ON is handled by regulator_set_voltage() */
4113 if (regulator_check_states(state) || state == PM_SUSPEND_ON)
4114 return -EINVAL;
4115
f8702f9e 4116 regulator_lock_dependent(regulator->rdev, &ww_ctx);
f7efad10
CZ		 4117
4118 ret = _regulator_set_suspend_voltage(regulator, min_uV,
4119 max_uV, state);
4120
f8702f9e 4121 regulator_unlock_dependent(regulator->rdev, &ww_ctx);
f7efad10
CZ		 4122
4123 return ret;
4124}
4125EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage);
4126
88cd222b
LW		 4127/**
4128 * regulator_set_voltage_time - get raise/fall time
4129 * @regulator: regulator source
4130 * @old_uV: starting voltage in microvolts
4131 * @new_uV: target voltage in microvolts
4132 *
4133 * Provided with the starting and ending voltage, this function attempts to
4134 * calculate the time in microseconds required to rise or fall to this new
4135 * voltage.
4136 */
4137int regulator_set_voltage_time(struct regulator *regulator,
4138 int old_uV, int new_uV)
4139{
272e2315
GX		 4140 struct regulator_dev *rdev = regulator->rdev;
4141 const struct regulator_ops *ops = rdev->desc->ops;
88cd222b
LW		 4142 int old_sel = -1;
4143 int new_sel = -1;
4144 int voltage;
4145 int i;
4146
73e705bf
MK		 4147 if (ops->set_voltage_time)
4148 return ops->set_voltage_time(rdev, old_uV, new_uV);
4149 else if (!ops->set_voltage_time_sel)
4150 return _regulator_set_voltage_time(rdev, old_uV, new_uV);
4151
88cd222b 4152 /* Currently requires operations to do this */
73e705bf 4153 if (!ops->list_voltage || !rdev->desc->n_voltages)
88cd222b
LW		 4154 return -EINVAL;
4155
4156 for (i = 0; i < rdev->desc->n_voltages; i++) {
4157 /* We only look for exact voltage matches here */
bdcd1177
CB		 4158 if (i < rdev->desc->linear_min_sel)
4159 continue;
4160
ab97800e
CB		 4161 if (old_sel >= 0 && new_sel >= 0)
4162 break;
4163
88cd222b
LW		 4164 voltage = regulator_list_voltage(regulator, i);
4165 if (voltage < 0)
4166 return -EINVAL;
4167 if (voltage == 0)
4168 continue;
4169 if (voltage == old_uV)
4170 old_sel = i;
4171 if (voltage == new_uV)
4172 new_sel = i;
4173 }
4174
4175 if (old_sel < 0 || new_sel < 0)
4176 return -EINVAL;
4177
4178 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
4179}
4180EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
4181
98a175b6 4182/**
296c6566
RD		 4183 * regulator_set_voltage_time_sel - get raise/fall time
4184 * @rdev: regulator source device
98a175b6
YSB		 4185 * @old_selector: selector for starting voltage
4186 * @new_selector: selector for target voltage
4187 *
4188 * Provided with the starting and target voltage selectors, this function
4189 * returns time in microseconds required to rise or fall to this new voltage
4190 *
f11d08c3 4191 * Drivers providing ramp_delay in regulation_constraints can use this as their
398715ab 4192 * set_voltage_time_sel() operation.
98a175b6
YSB		 4193 */
4194int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
4195 unsigned int old_selector,
4196 unsigned int new_selector)
4197{
f11d08c3 4198 int old_volt, new_volt;
398715ab 4199
f11d08c3
AL		 4200 /* sanity check */
4201 if (!rdev->desc->ops->list_voltage)
4202 return -EINVAL;
398715ab 4203
f11d08c3
AL		 4204 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
4205 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
4206
73e705bf
MK		 4207 if (rdev->desc->ops->set_voltage_time)
4208 return rdev->desc->ops->set_voltage_time(rdev, old_volt,
4209 new_volt);
4210 else
4211 return _regulator_set_voltage_time(rdev, old_volt, new_volt);
98a175b6 4212}
b19dbf71 4213EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
98a175b6 4214
380d2b2d
DO		 4215int regulator_sync_voltage_rdev(struct regulator_dev *rdev)
4216{
4217 int ret;
4218
4219 regulator_lock(rdev);
4220
4221 if (!rdev->desc->ops->set_voltage &&
4222 !rdev->desc->ops->set_voltage_sel) {
4223 ret = -EINVAL;
4224 goto out;
4225 }
4226
4227 /* balance only, if regulator is coupled */
4228 if (rdev->coupling_desc.n_coupled > 1)
4229 ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
4230 else
4231 ret = -EOPNOTSUPP;
4232
4233out:
4234 regulator_unlock(rdev);
4235 return ret;
4236}
4237
606a2562
MB		 4238/**
4239 * regulator_sync_voltage - re-apply last regulator output voltage
4240 * @regulator: regulator source
4241 *
4242 * Re-apply the last configured voltage. This is intended to be used
4243 * where some external control source the consumer is cooperating with
4244 * has caused the configured voltage to change.
4245 */
4246int regulator_sync_voltage(struct regulator *regulator)
4247{
4248 struct regulator_dev *rdev = regulator->rdev;
c360a6df 4249 struct regulator_voltage *voltage = &regulator->voltage[PM_SUSPEND_ON];
606a2562
MB		 4250 int ret, min_uV, max_uV;
4251
66cf9a7e 4252 regulator_lock(rdev);
606a2562
MB		 4253
4254 if (!rdev->desc->ops->set_voltage &&
4255 !rdev->desc->ops->set_voltage_sel) {
4256 ret = -EINVAL;
4257 goto out;
4258 }
4259
4260 /* This is only going to work if we've had a voltage configured. */
c360a6df 4261 if (!voltage->min_uV && !voltage->max_uV) {
606a2562
MB		 4262 ret = -EINVAL;
4263 goto out;
4264 }
4265
c360a6df
CZ		 4266 min_uV = voltage->min_uV;
4267 max_uV = voltage->max_uV;
606a2562
MB		 4268
4269 /* This should be a paranoia check... */
4270 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
4271 if (ret < 0)
4272 goto out;
4273
c360a6df 4274 ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0);
606a2562
MB		 4275 if (ret < 0)
4276 goto out;
4277
24be0c71
DO		 4278 /* balance only, if regulator is coupled */
4279 if (rdev->coupling_desc.n_coupled > 1)
4280 ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
4281 else
4282 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
606a2562
MB		 4283
4284out:
66cf9a7e 4285 regulator_unlock(rdev);
606a2562
MB		 4286 return ret;
4287}
4288EXPORT_SYMBOL_GPL(regulator_sync_voltage);
4289
d22b85a1 4290int regulator_get_voltage_rdev(struct regulator_dev *rdev)
414c70cb 4291{
bf5892a8 4292 int sel, ret;
fef95019
MB		 4293 bool bypassed;
4294
4295 if (rdev->desc->ops->get_bypass) {
4296 ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
4297 if (ret < 0)
4298 return ret;
4299 if (bypassed) {
4300 /* if bypassed the regulator must have a supply */
45389c47
JH		 4301 if (!rdev->supply) {
4302 rdev_err(rdev,
4303 "bypassed regulator has no supply!\n");
4304 return -EPROBE_DEFER;
4305 }
fef95019 4306
d22b85a1 4307 return regulator_get_voltage_rdev(rdev->supply->rdev);
fef95019
MB		 4308 }
4309 }
476c2d83
MB		 4310
4311 if (rdev->desc->ops->get_voltage_sel) {
4312 sel = rdev->desc->ops->get_voltage_sel(rdev);
4313 if (sel < 0)
4314 return sel;
bf5892a8 4315 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 4316 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 4317 ret = rdev->desc->ops->get_voltage(rdev);
f7df20ec
MB		 4318 } else if (rdev->desc->ops->list_voltage) {
4319 ret = rdev->desc->ops->list_voltage(rdev, 0);
5a523605
LD		 4320 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
4321 ret = rdev->desc->fixed_uV;
e303996e 4322 } else if (rdev->supply) {
d22b85a1 4323 ret = regulator_get_voltage_rdev(rdev->supply->rdev);
cf1ad559
MM		 4324 } else if (rdev->supply_name) {
4325 return -EPROBE_DEFER;
cb220d16 4326 } else {
414c70cb 4327 return -EINVAL;
cb220d16 4328 }
bf5892a8 4329
cb220d16
AL		 4330 if (ret < 0)
4331 return ret;
bf5892a8 4332 return ret - rdev->constraints->uV_offset;
414c70cb 4333}
3d7610e8 4334EXPORT_SYMBOL_GPL(regulator_get_voltage_rdev);
414c70cb
LG		 4335
4336/**
4337 * regulator_get_voltage - get regulator output voltage
4338 * @regulator: regulator source
4339 *
4340 * This returns the current regulator voltage in uV.
4341 *
4342 * NOTE: If the regulator is disabled it will return the voltage value. This
4343 * function should not be used to determine regulator state.
4344 */
4345int regulator_get_voltage(struct regulator *regulator)
4346{
f8702f9e 4347 struct ww_acquire_ctx ww_ctx;
414c70cb
LG		 4348 int ret;
4349
f8702f9e 4350 regulator_lock_dependent(regulator->rdev, &ww_ctx);
d22b85a1 4351 ret = regulator_get_voltage_rdev(regulator->rdev);
f8702f9e 4352 regulator_unlock_dependent(regulator->rdev, &ww_ctx);
414c70cb
LG		 4353
4354 return ret;
4355}
4356EXPORT_SYMBOL_GPL(regulator_get_voltage);
4357
4358/**
4359 * regulator_set_current_limit - set regulator output current limit
4360 * @regulator: regulator source
ce0d10f8 4361 * @min_uA: Minimum supported current in uA
414c70cb
LG		 4362 * @max_uA: Maximum supported current in uA
4363 *
4364 * Sets current sink to the desired output current. This can be set during
4365 * any regulator state. IOW, regulator can be disabled or enabled.
4366 *
4367 * If the regulator is enabled then the current will change to the new value
4368 * immediately otherwise if the regulator is disabled the regulator will
4369 * output at the new current when enabled.
4370 *
4371 * NOTE: Regulator system constraints must be set for this regulator before
4372 * calling this function otherwise this call will fail.
4373 */
4374int regulator_set_current_limit(struct regulator *regulator,
4375 int min_uA, int max_uA)
4376{
4377 struct regulator_dev *rdev = regulator->rdev;
4378 int ret;
4379
66cf9a7e 4380 regulator_lock(rdev);
414c70cb
LG		 4381
4382 /* sanity check */
4383 if (!rdev->desc->ops->set_current_limit) {
4384 ret = -EINVAL;
4385 goto out;
4386 }
4387
4388 /* constraints check */
4389 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
4390 if (ret < 0)
4391 goto out;
4392
4393 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
4394out:
66cf9a7e 4395 regulator_unlock(rdev);
414c70cb
LG		 4396 return ret;
4397}
4398EXPORT_SYMBOL_GPL(regulator_set_current_limit);
4399
7e4d9683
DA		 4400static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev)
4401{
4402 /* sanity check */
4403 if (!rdev->desc->ops->get_current_limit)
4404 return -EINVAL;
4405
4406 return rdev->desc->ops->get_current_limit(rdev);
4407}
4408
414c70cb
LG		 4409static int _regulator_get_current_limit(struct regulator_dev *rdev)
4410{
4411 int ret;
4412
66cf9a7e 4413 regulator_lock(rdev);
7e4d9683 4414 ret = _regulator_get_current_limit_unlocked(rdev);
66cf9a7e 4415 regulator_unlock(rdev);
7e4d9683 4416
414c70cb
LG		 4417 return ret;
4418}
4419
4420/**
4421 * regulator_get_current_limit - get regulator output current
4422 * @regulator: regulator source
4423 *
4424 * This returns the current supplied by the specified current sink in uA.
4425 *
4426 * NOTE: If the regulator is disabled it will return the current value. This
4427 * function should not be used to determine regulator state.
4428 */
4429int regulator_get_current_limit(struct regulator *regulator)
4430{
4431 return _regulator_get_current_limit(regulator->rdev);
4432}
4433EXPORT_SYMBOL_GPL(regulator_get_current_limit);
4434
4435/**
4436 * regulator_set_mode - set regulator operating mode
4437 * @regulator: regulator source
4438 * @mode: operating mode - one of the REGULATOR_MODE constants
4439 *
4440 * Set regulator operating mode to increase regulator efficiency or improve
4441 * regulation performance.
4442 *
4443 * NOTE: Regulator system constraints must be set for this regulator before
4444 * calling this function otherwise this call will fail.
4445 */
4446int regulator_set_mode(struct regulator *regulator, unsigned int mode)
4447{
4448 struct regulator_dev *rdev = regulator->rdev;
4449 int ret;
500b4ac9 4450 int regulator_curr_mode;
414c70cb 4451
66cf9a7e 4452 regulator_lock(rdev);
414c70cb
LG		 4453
4454 /* sanity check */
4455 if (!rdev->desc->ops->set_mode) {
4456 ret = -EINVAL;
4457 goto out;
4458 }
4459
500b4ac9
SI		 4460 /* return if the same mode is requested */
4461 if (rdev->desc->ops->get_mode) {
4462 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
4463 if (regulator_curr_mode == mode) {
4464 ret = 0;
4465 goto out;
4466 }
4467 }
4468
414c70cb 4469 /* constraints check */
22c51b47 4470 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 4471 if (ret < 0)
4472 goto out;
4473
4474 ret = rdev->desc->ops->set_mode(rdev, mode);
4475out:
66cf9a7e 4476 regulator_unlock(rdev);
414c70cb
LG		 4477 return ret;
4478}
4479EXPORT_SYMBOL_GPL(regulator_set_mode);
4480
7e4d9683
DA		 4481static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev)
4482{
4483 /* sanity check */
4484 if (!rdev->desc->ops->get_mode)
4485 return -EINVAL;
4486
4487 return rdev->desc->ops->get_mode(rdev);
4488}
4489
414c70cb
LG		 4490static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
4491{
4492 int ret;
4493
66cf9a7e 4494 regulator_lock(rdev);
7e4d9683 4495 ret = _regulator_get_mode_unlocked(rdev);
66cf9a7e 4496 regulator_unlock(rdev);
7e4d9683 4497
414c70cb
LG		 4498 return ret;
4499}
4500
4501/**
4502 * regulator_get_mode - get regulator operating mode
4503 * @regulator: regulator source
4504 *
4505 * Get the current regulator operating mode.
4506 */
4507unsigned int regulator_get_mode(struct regulator *regulator)
4508{
4509 return _regulator_get_mode(regulator->rdev);
4510}
4511EXPORT_SYMBOL_GPL(regulator_get_mode);
4512
7111c6d1
MV		 4513static int rdev_get_cached_err_flags(struct regulator_dev *rdev)
4514{
4515 int ret = 0;
4516
4517 if (rdev->use_cached_err) {
4518 spin_lock(&rdev->err_lock);
4519 ret = rdev->cached_err;
4520 spin_unlock(&rdev->err_lock);
4521 }
4522 return ret;
4523}
4524
1b5b4221
AH		 4525static int _regulator_get_error_flags(struct regulator_dev *rdev,
4526 unsigned int *flags)
4527{
7111c6d1 4528 int cached_flags, ret = 0;
1b5b4221 4529
66cf9a7e 4530 regulator_lock(rdev);
1b5b4221 4531
7111c6d1
MV		 4532 cached_flags = rdev_get_cached_err_flags(rdev);
4533
4534 if (rdev->desc->ops->get_error_flags)
4535 ret = rdev->desc->ops->get_error_flags(rdev, flags);
4536 else if (!rdev->use_cached_err)
1b5b4221 4537 ret = -EINVAL;
1b5b4221 4538
7111c6d1
MV		 4539 *flags |= cached_flags;
4540
66cf9a7e 4541 regulator_unlock(rdev);
7111c6d1 4542
1b5b4221
AH		 4543 return ret;
4544}
4545
4546/**
4547 * regulator_get_error_flags - get regulator error information
4548 * @regulator: regulator source
4549 * @flags: pointer to store error flags
4550 *
4551 * Get the current regulator error information.
4552 */
4553int regulator_get_error_flags(struct regulator *regulator,
4554 unsigned int *flags)
4555{
4556 return _regulator_get_error_flags(regulator->rdev, flags);
4557}
4558EXPORT_SYMBOL_GPL(regulator_get_error_flags);
4559
414c70cb 4560/**
e39ce48f 4561 * regulator_set_load - set regulator load
414c70cb
LG		 4562 * @regulator: regulator source
4563 * @uA_load: load current
4564 *
4565 * Notifies the regulator core of a new device load. This is then used by
4566 * DRMS (if enabled by constraints) to set the most efficient regulator
4567 * operating mode for the new regulator loading.
4568 *
4569 * Consumer devices notify their supply regulator of the maximum power
4570 * they will require (can be taken from device datasheet in the power
4571 * consumption tables) when they change operational status and hence power
4572 * state. Examples of operational state changes that can affect power
4573 * consumption are :-
4574 *
4575 * o Device is opened / closed.
4576 * o Device I/O is about to begin or has just finished.
4577 * o Device is idling in between work.
4578 *
4579 * This information is also exported via sysfs to userspace.
4580 *
4581 * DRMS will sum the total requested load on the regulator and change
4582 * to the most efficient operating mode if platform constraints allow.
4583 *
5451781d
DA		 4584 * NOTE: when a regulator consumer requests to have a regulator
4585 * disabled then any load that consumer requested no longer counts
4586 * toward the total requested load. If the regulator is re-enabled
4587 * then the previously requested load will start counting again.
4588 *
4589 * If a regulator is an always-on regulator then an individual consumer's
4590 * load will still be removed if that consumer is fully disabled.
4591 *
e39ce48f 4592 * On error a negative errno is returned.
414c70cb 4593 */
e39ce48f 4594int regulator_set_load(struct regulator *regulator, int uA_load)
414c70cb
LG		 4595{
4596 struct regulator_dev *rdev = regulator->rdev;
5451781d
DA		 4597 int old_uA_load;
4598 int ret = 0;
d92d95b6 4599
66cf9a7e 4600 regulator_lock(rdev);
5451781d 4601 old_uA_load = regulator->uA_load;
414c70cb 4602 regulator->uA_load = uA_load;
5451781d
DA		 4603 if (regulator->enable_count && old_uA_load != uA_load) {
4604 ret = drms_uA_update(rdev);
4605 if (ret < 0)
4606 regulator->uA_load = old_uA_load;
4607 }
66cf9a7e 4608 regulator_unlock(rdev);
8460ef38 4609
414c70cb
LG		 4610 return ret;
4611}
e39ce48f 4612EXPORT_SYMBOL_GPL(regulator_set_load);
414c70cb 4613
f59c8f9f
MB		 4614/**
4615 * regulator_allow_bypass - allow the regulator to go into bypass mode
4616 *
4617 * @regulator: Regulator to configure
9345dfb8 4618 * @enable: enable or disable bypass mode
f59c8f9f
MB		 4619 *
4620 * Allow the regulator to go into bypass mode if all other consumers
4621 * for the regulator also enable bypass mode and the machine
4622 * constraints allow this. Bypass mode means that the regulator is
4623 * simply passing the input directly to the output with no regulation.
4624 */
4625int regulator_allow_bypass(struct regulator *regulator, bool enable)
4626{
4627 struct regulator_dev *rdev = regulator->rdev;
48325655 4628 const char *name = rdev_get_name(rdev);
f59c8f9f
MB		 4629 int ret = 0;
4630
4631 if (!rdev->desc->ops->set_bypass)
4632 return 0;
4633
8a34e979 4634 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS))
f59c8f9f
MB		 4635 return 0;
4636
66cf9a7e 4637 regulator_lock(rdev);
f59c8f9f
MB		 4638
4639 if (enable && !regulator->bypass) {
4640 rdev->bypass_count++;
4641
4642 if (rdev->bypass_count == rdev->open_count) {
48325655
CK		 4643 trace_regulator_bypass_enable(name);
4644
f59c8f9f
MB		 4645 ret = rdev->desc->ops->set_bypass(rdev, enable);
4646 if (ret != 0)
4647 rdev->bypass_count--;
48325655
CK		 4648 else
4649 trace_regulator_bypass_enable_complete(name);
f59c8f9f
MB		 4650 }
4651
4652 } else if (!enable && regulator->bypass) {
4653 rdev->bypass_count--;
4654
4655 if (rdev->bypass_count != rdev->open_count) {
48325655
CK		 4656 trace_regulator_bypass_disable(name);
4657
f59c8f9f
MB		 4658 ret = rdev->desc->ops->set_bypass(rdev, enable);
4659 if (ret != 0)
4660 rdev->bypass_count++;
48325655
CK		 4661 else
4662 trace_regulator_bypass_disable_complete(name);
f59c8f9f
MB		 4663 }
4664 }
4665
4666 if (ret == 0)
4667 regulator->bypass = enable;
4668
66cf9a7e 4669 regulator_unlock(rdev);
f59c8f9f
MB		 4670
4671 return ret;
4672}
4673EXPORT_SYMBOL_GPL(regulator_allow_bypass);
4674
414c70cb
LG		 4675/**
4676 * regulator_register_notifier - register regulator event notifier
4677 * @regulator: regulator source
69279fb9 4678 * @nb: notifier block
414c70cb
LG		 4679 *
4680 * Register notifier block to receive regulator events.
4681 */
4682int regulator_register_notifier(struct regulator *regulator,
4683 struct notifier_block *nb)
4684{
4685 return blocking_notifier_chain_register(&regulator->rdev->notifier,
4686 nb);
4687}
4688EXPORT_SYMBOL_GPL(regulator_register_notifier);
4689
4690/**
4691 * regulator_unregister_notifier - unregister regulator event notifier
4692 * @regulator: regulator source
69279fb9 4693 * @nb: notifier block
414c70cb
LG		 4694 *
4695 * Unregister regulator event notifier block.
4696 */
4697int regulator_unregister_notifier(struct regulator *regulator,
4698 struct notifier_block *nb)
4699{
4700 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
4701 nb);
4702}
4703EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
4704
b136fb44
JC		 4705/* notify regulator consumers and downstream regulator consumers.
4706 * Note mutex must be held by caller.
4707 */
7179569a 4708static int _notifier_call_chain(struct regulator_dev *rdev,
414c70cb
LG		 4709 unsigned long event, void *data)
4710{
414c70cb 4711 /* call rdev chain first */
7179569a 4712 return blocking_notifier_call_chain(&rdev->notifier, event, data);
414c70cb
LG		 4713}
4714
4715/**
4716 * regulator_bulk_get - get multiple regulator consumers
4717 *
4718 * @dev: Device to supply
4719 * @num_consumers: Number of consumers to register
4720 * @consumers: Configuration of consumers; clients are stored here.
4721 *
4722 * @return 0 on success, an errno on failure.
4723 *
4724 * This helper function allows drivers to get several regulator
4725 * consumers in one operation. If any of the regulators cannot be
4726 * acquired then any regulators that were allocated will be freed
4727 * before returning to the caller.
4728 */
4729int regulator_bulk_get(struct device *dev, int num_consumers,
4730 struct regulator_bulk_data *consumers)
4731{
4732 int i;
4733 int ret;
4734
4735 for (i = 0; i < num_consumers; i++)
4736 consumers[i].consumer = NULL;
4737
4738 for (i = 0; i < num_consumers; i++) {
565f9b07
BA		 4739 consumers[i].consumer = regulator_get(dev,
4740 consumers[i].supply);
414c70cb 4741 if (IS_ERR(consumers[i].consumer)) {
414c70cb
LG		 4742 ret = PTR_ERR(consumers[i].consumer);
4743 consumers[i].consumer = NULL;
4744 goto err;
4745 }
4746 }
4747
4748 return 0;
4749
4750err:
b9816363 4751 if (ret != -EPROBE_DEFER)
61aab5ad
MM		 4752 dev_err(dev, "Failed to get supply '%s': %pe\n",
4753 consumers[i].supply, ERR_PTR(ret));
b9816363
JRO		 4754 else
4755 dev_dbg(dev, "Failed to get supply '%s', deferring\n",
4756 consumers[i].supply);
4757
b29c7690 4758 while (--i >= 0)
414c70cb
LG		 4759 regulator_put(consumers[i].consumer);
4760
4761 return ret;
4762}
4763EXPORT_SYMBOL_GPL(regulator_bulk_get);
4764
f21e0e81
MB		 4765static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
4766{
4767 struct regulator_bulk_data *bulk = data;
4768
4769 bulk->ret = regulator_enable(bulk->consumer);
4770}
4771
414c70cb
LG		 4772/**
4773 * regulator_bulk_enable - enable multiple regulator consumers
4774 *
4775 * @num_consumers: Number of consumers
4776 * @consumers: Consumer data; clients are stored here.
4777 * @return 0 on success, an errno on failure
4778 *
4779 * This convenience API allows consumers to enable multiple regulator
4780 * clients in a single API call. If any consumers cannot be enabled
4781 * then any others that were enabled will be disabled again prior to
4782 * return.
4783 */
4784int regulator_bulk_enable(int num_consumers,
4785 struct regulator_bulk_data *consumers)
4786{
2955b47d 4787 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
414c70cb 4788 int i;
f21e0e81 4789 int ret = 0;
414c70cb 4790
6492bc1b 4791 for (i = 0; i < num_consumers; i++) {
5451781d
DA		 4792 async_schedule_domain(regulator_bulk_enable_async,
4793 &consumers[i], &async_domain);
6492bc1b 4794 }
f21e0e81
MB		 4795
4796 async_synchronize_full_domain(&async_domain);
4797
4798 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 4799 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 4800 if (consumers[i].ret != 0) {
4801 ret = consumers[i].ret;
414c70cb 4802 goto err;
f21e0e81 4803 }
414c70cb
LG		 4804 }
4805
4806 return 0;
4807
4808err:
fbe31057
AH		 4809 for (i = 0; i < num_consumers; i++) {
4810 if (consumers[i].ret < 0)
61aab5ad
MM		 4811 pr_err("Failed to enable %s: %pe\n", consumers[i].supply,
4812 ERR_PTR(consumers[i].ret));
fbe31057
AH		 4813 else
4814 regulator_disable(consumers[i].consumer);
4815 }
414c70cb
LG		 4816
4817 return ret;
4818}
4819EXPORT_SYMBOL_GPL(regulator_bulk_enable);
4820
4821/**
4822 * regulator_bulk_disable - disable multiple regulator consumers
4823 *
4824 * @num_consumers: Number of consumers
4825 * @consumers: Consumer data; clients are stored here.
4826 * @return 0 on success, an errno on failure
4827 *
4828 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 4829 * clients in a single API call. If any consumers cannot be disabled
4830 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 4831 * return.
4832 */
4833int regulator_bulk_disable(int num_consumers,
4834 struct regulator_bulk_data *consumers)
4835{
4836 int i;
01e86f49 4837 int ret, r;
414c70cb 4838
49e22632 4839 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 4840 ret = regulator_disable(consumers[i].consumer);
4841 if (ret != 0)
4842 goto err;
4843 }
4844
4845 return 0;
4846
4847err:
61aab5ad 4848 pr_err("Failed to disable %s: %pe\n", consumers[i].supply, ERR_PTR(ret));
01e86f49
MB		 4849 for (++i; i < num_consumers; ++i) {
4850 r = regulator_enable(consumers[i].consumer);
4851 if (r != 0)
61aab5ad
MM		 4852 pr_err("Failed to re-enable %s: %pe\n",
4853 consumers[i].supply, ERR_PTR(r));
01e86f49 4854 }
414c70cb
LG		 4855
4856 return ret;
4857}
4858EXPORT_SYMBOL_GPL(regulator_bulk_disable);
4859
e1de2f42
DK		 4860/**
4861 * regulator_bulk_force_disable - force disable multiple regulator consumers
4862 *
4863 * @num_consumers: Number of consumers
4864 * @consumers: Consumer data; clients are stored here.
4865 * @return 0 on success, an errno on failure
4866 *
4867 * This convenience API allows consumers to forcibly disable multiple regulator
4868 * clients in a single API call.
4869 * NOTE: This should be used for situations when device damage will
4870 * likely occur if the regulators are not disabled (e.g. over temp).
4871 * Although regulator_force_disable function call for some consumers can
4872 * return error numbers, the function is called for all consumers.
4873 */
4874int regulator_bulk_force_disable(int num_consumers,
4875 struct regulator_bulk_data *consumers)
4876{
4877 int i;
b8c77ff6 4878 int ret = 0;
e1de2f42 4879
b8c77ff6 4880 for (i = 0; i < num_consumers; i++) {
e1de2f42
DK		 4881 consumers[i].ret =
4882 regulator_force_disable(consumers[i].consumer);
4883
b8c77ff6
DT		 4884 /* Store first error for reporting */
4885 if (consumers[i].ret && !ret)
e1de2f42 4886 ret = consumers[i].ret;
e1de2f42
DK		 4887 }
4888
e1de2f42
DK		 4889 return ret;
4890}
4891EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
4892
414c70cb
LG		 4893/**
4894 * regulator_bulk_free - free multiple regulator consumers
4895 *
4896 * @num_consumers: Number of consumers
4897 * @consumers: Consumer data; clients are stored here.
4898 *
4899 * This convenience API allows consumers to free multiple regulator
4900 * clients in a single API call.
4901 */
4902void regulator_bulk_free(int num_consumers,
4903 struct regulator_bulk_data *consumers)
4904{
4905 int i;
4906
4907 for (i = 0; i < num_consumers; i++) {
4908 regulator_put(consumers[i].consumer);
4909 consumers[i].consumer = NULL;
4910 }
4911}
4912EXPORT_SYMBOL_GPL(regulator_bulk_free);
4913
4914/**
4915 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 4916 * @rdev: regulator source
414c70cb 4917 * @event: notifier block
69279fb9 4918 * @data: callback-specific data.
414c70cb
LG		 4919 *
4920 * Called by regulator drivers to notify clients a regulator event has
3bca239d 4921 * occurred.
414c70cb
LG		 4922 */
4923int regulator_notifier_call_chain(struct regulator_dev *rdev,
4924 unsigned long event, void *data)
4925{
4926 _notifier_call_chain(rdev, event, data);
4927 return NOTIFY_DONE;
4928
4929}
4930EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
4931
be721979
MB		 4932/**
4933 * regulator_mode_to_status - convert a regulator mode into a status
4934 *
4935 * @mode: Mode to convert
4936 *
4937 * Convert a regulator mode into a status.
4938 */
4939int regulator_mode_to_status(unsigned int mode)
4940{
4941 switch (mode) {
4942 case REGULATOR_MODE_FAST:
4943 return REGULATOR_STATUS_FAST;
4944 case REGULATOR_MODE_NORMAL:
4945 return REGULATOR_STATUS_NORMAL;
4946 case REGULATOR_MODE_IDLE:
4947 return REGULATOR_STATUS_IDLE;
03ffcf3d 4948 case REGULATOR_MODE_STANDBY:
be721979
MB		 4949 return REGULATOR_STATUS_STANDBY;
4950 default:
1beaf762 4951 return REGULATOR_STATUS_UNDEFINED;
be721979
MB		 4952 }
4953}
4954EXPORT_SYMBOL_GPL(regulator_mode_to_status);
4955
39f802d6
TI		 4956static struct attribute *regulator_dev_attrs[] = {
4957 &dev_attr_name.attr,
4958 &dev_attr_num_users.attr,
4959 &dev_attr_type.attr,
4960 &dev_attr_microvolts.attr,
4961 &dev_attr_microamps.attr,
4962 &dev_attr_opmode.attr,
4963 &dev_attr_state.attr,
4964 &dev_attr_status.attr,
4965 &dev_attr_bypass.attr,
4966 &dev_attr_requested_microamps.attr,
4967 &dev_attr_min_microvolts.attr,
4968 &dev_attr_max_microvolts.attr,
4969 &dev_attr_min_microamps.attr,
4970 &dev_attr_max_microamps.attr,
4971 &dev_attr_suspend_standby_state.attr,
4972 &dev_attr_suspend_mem_state.attr,
4973 &dev_attr_suspend_disk_state.attr,
4974 &dev_attr_suspend_standby_microvolts.attr,
4975 &dev_attr_suspend_mem_microvolts.attr,
4976 &dev_attr_suspend_disk_microvolts.attr,
4977 &dev_attr_suspend_standby_mode.attr,
4978 &dev_attr_suspend_mem_mode.attr,
4979 &dev_attr_suspend_disk_mode.attr,
4980 NULL
4981};
4982
7ad68e2f
DB		 4983/*
4984 * To avoid cluttering sysfs (and memory) with useless state, only
4985 * create attributes that can be meaningfully displayed.
4986 */
39f802d6
TI		 4987static umode_t regulator_attr_is_visible(struct kobject *kobj,
4988 struct attribute *attr, int idx)
7ad68e2f 4989{
39f802d6 4990 struct device *dev = kobj_to_dev(kobj);
83080a14 4991 struct regulator_dev *rdev = dev_to_rdev(dev);
272e2315 4992 const struct regulator_ops *ops = rdev->desc->ops;
39f802d6
TI		 4993 umode_t mode = attr->mode;
4994
4995 /* these three are always present */
4996 if (attr == &dev_attr_name.attr ||
4997 attr == &dev_attr_num_users.attr ||
4998 attr == &dev_attr_type.attr)
4999 return mode;
7ad68e2f
DB		 5000
5001 /* some attributes need specific methods to be displayed */
39f802d6
TI		 5002 if (attr == &dev_attr_microvolts.attr) {
5003 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
5004 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
5005 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
5006 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
5007 return mode;
5008 return 0;
f59c8f9f 5009 }
7ad68e2f 5010
39f802d6
TI		 5011 if (attr == &dev_attr_microamps.attr)
5012 return ops->get_current_limit ? mode : 0;
5013
5014 if (attr == &dev_attr_opmode.attr)
5015 return ops->get_mode ? mode : 0;
5016
5017 if (attr == &dev_attr_state.attr)
5018 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
5019
5020 if (attr == &dev_attr_status.attr)
5021 return ops->get_status ? mode : 0;
5022
5023 if (attr == &dev_attr_bypass.attr)
5024 return ops->get_bypass ? mode : 0;
5025
7ad68e2f 5026 /* constraints need specific supporting methods */
39f802d6
TI		 5027 if (attr == &dev_attr_min_microvolts.attr ||
5028 attr == &dev_attr_max_microvolts.attr)
5029 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
5030
5031 if (attr == &dev_attr_min_microamps.attr ||
5032 attr == &dev_attr_max_microamps.attr)
5033 return ops->set_current_limit ? mode : 0;
5034
5035 if (attr == &dev_attr_suspend_standby_state.attr ||
5036 attr == &dev_attr_suspend_mem_state.attr ||
5037 attr == &dev_attr_suspend_disk_state.attr)
5038 return mode;
5039
5040 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
5041 attr == &dev_attr_suspend_mem_microvolts.attr ||
5042 attr == &dev_attr_suspend_disk_microvolts.attr)
5043 return ops->set_suspend_voltage ? mode : 0;
5044
5045 if (attr == &dev_attr_suspend_standby_mode.attr ||
5046 attr == &dev_attr_suspend_mem_mode.attr ||
5047 attr == &dev_attr_suspend_disk_mode.attr)
5048 return ops->set_suspend_mode ? mode : 0;
5049
5050 return mode;
5051}
5052
5053static const struct attribute_group regulator_dev_group = {
5054 .attrs = regulator_dev_attrs,
5055 .is_visible = regulator_attr_is_visible,
5056};
5057
5058static const struct attribute_group *regulator_dev_groups[] = {
5059 &regulator_dev_group,
5060 NULL
5061};
7ad68e2f 5062
39f802d6
TI		 5063static void regulator_dev_release(struct device *dev)
5064{
5065 struct regulator_dev *rdev = dev_get_drvdata(dev);
29f5f486
MB		 5066
5067 kfree(rdev->constraints);
5068 of_node_put(rdev->dev.of_node);
39f802d6 5069 kfree(rdev);
7ad68e2f
DB		 5070}
5071
1130e5b3
MB		 5072static void rdev_init_debugfs(struct regulator_dev *rdev)
5073{
a9eaa813
GR		 5074 struct device *parent = rdev->dev.parent;
5075 const char *rname = rdev_get_name(rdev);
5076 char name[NAME_MAX];
5077
5078 /* Avoid duplicate debugfs directory names */
5079 if (parent && rname == rdev->desc->name) {
5080 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
5081 rname);
5082 rname = name;
5083 }
5084
5085 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
24751434 5086 if (!rdev->debugfs) {
1130e5b3 5087 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 5088 return;
5089 }
5090
5091 debugfs_create_u32("use_count", 0444, rdev->debugfs,
5092 &rdev->use_count);
5093 debugfs_create_u32("open_count", 0444, rdev->debugfs,
5094 &rdev->open_count);
f59c8f9f
MB		 5095 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
5096 &rdev->bypass_count);
1130e5b3
MB		 5097}
5098
5e3ca2b3
JMC		 5099static int regulator_register_resolve_supply(struct device *dev, void *data)
5100{
7ddede6a
JH		 5101 struct regulator_dev *rdev = dev_to_rdev(dev);
5102
5103 if (regulator_resolve_supply(rdev))
5104 rdev_dbg(rdev, "unable to resolve supply\n");
5105
5106 return 0;
5e3ca2b3
JMC		 5107}
5108
d8ca7d18
DO		 5109int regulator_coupler_register(struct regulator_coupler *coupler)
5110{
5111 mutex_lock(&regulator_list_mutex);
5112 list_add_tail(&coupler->list, &regulator_coupler_list);
5113 mutex_unlock(&regulator_list_mutex);
5114
5115 return 0;
5116}
5117
5118static struct regulator_coupler *
5119regulator_find_coupler(struct regulator_dev *rdev)
5120{
5121 struct regulator_coupler *coupler;
5122 int err;
5123
5124 /*
5125 * Note that regulators are appended to the list and the generic
5126 * coupler is registered first, hence it will be attached at last
5127 * if nobody cared.
5128 */
5129 list_for_each_entry_reverse(coupler, &regulator_coupler_list, list) {
5130 err = coupler->attach_regulator(coupler, rdev);
5131 if (!err) {
5132 if (!coupler->balance_voltage &&
5133 rdev->coupling_desc.n_coupled > 2)
5134 goto err_unsupported;
5135
5136 return coupler;
5137 }
5138
5139 if (err < 0)
5140 return ERR_PTR(err);
5141
5142 if (err == 1)
5143 continue;
5144
5145 break;
5146 }
5147
5148 return ERR_PTR(-EINVAL);
5149
5150err_unsupported:
5151 if (coupler->detach_regulator)
5152 coupler->detach_regulator(coupler, rdev);
5153
5154 rdev_err(rdev,
5155 "Voltage balancing for multiple regulator couples is unimplemented\n");
5156
5157 return ERR_PTR(-EPERM);
5158}
5159
f9503385 5160static void regulator_resolve_coupling(struct regulator_dev *rdev)
d3d64537 5161{
d8ca7d18 5162 struct regulator_coupler *coupler = rdev->coupling_desc.coupler;
d3d64537
MP		 5163 struct coupling_desc *c_desc = &rdev->coupling_desc;
5164 int n_coupled = c_desc->n_coupled;
5165 struct regulator_dev *c_rdev;
5166 int i;
5167
5168 for (i = 1; i < n_coupled; i++) {
5169 /* already resolved */
5170 if (c_desc->coupled_rdevs[i])
5171 continue;
5172
5173 c_rdev = of_parse_coupled_regulator(rdev, i - 1);
5174
f9503385
DO		 5175 if (!c_rdev)
5176 continue;
d3d64537 5177
d8ca7d18
DO		 5178 if (c_rdev->coupling_desc.coupler != coupler) {
5179 rdev_err(rdev, "coupler mismatch with %s\n",
5180 rdev_get_name(c_rdev));
5181 return;
5182 }
5183
f9503385
DO		 5184 c_desc->coupled_rdevs[i] = c_rdev;
5185 c_desc->n_resolved++;
d3d64537 5186
f9503385
DO		 5187 regulator_resolve_coupling(c_rdev);
5188 }
d3d64537
MP		 5189}
5190
6303f3e7 5191static void regulator_remove_coupling(struct regulator_dev *rdev)
d3d64537 5192{
d8ca7d18 5193 struct regulator_coupler *coupler = rdev->coupling_desc.coupler;
6303f3e7
DO		 5194 struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc;
5195 struct regulator_dev *__c_rdev, *c_rdev;
5196 unsigned int __n_coupled, n_coupled;
5197 int i, k;
d8ca7d18 5198 int err;
d3d64537 5199
6303f3e7 5200 n_coupled = c_desc->n_coupled;
d3d64537 5201
6303f3e7
DO		 5202 for (i = 1; i < n_coupled; i++) {
5203 c_rdev = c_desc->coupled_rdevs[i];
d3d64537 5204
6303f3e7
DO		 5205 if (!c_rdev)
5206 continue;
5207
5208 regulator_lock(c_rdev);
5209
5210 __c_desc = &c_rdev->coupling_desc;
5211 __n_coupled = __c_desc->n_coupled;
5212
5213 for (k = 1; k < __n_coupled; k++) {
5214 __c_rdev = __c_desc->coupled_rdevs[k];
5215
5216 if (__c_rdev == rdev) {
5217 __c_desc->coupled_rdevs[k] = NULL;
5218 __c_desc->n_resolved--;
5219 break;
5220 }
5221 }
5222
5223 regulator_unlock(c_rdev);
5224
5225 c_desc->coupled_rdevs[i] = NULL;
5226 c_desc->n_resolved--;
5227 }
d8ca7d18
DO		 5228
5229 if (coupler && coupler->detach_regulator) {
5230 err = coupler->detach_regulator(coupler, rdev);
5231 if (err)
61aab5ad
MM		 5232 rdev_err(rdev, "failed to detach from coupler: %pe\n",
5233 ERR_PTR(err));
d8ca7d18
DO		 5234 }
5235
5236 kfree(rdev->coupling_desc.coupled_rdevs);
5237 rdev->coupling_desc.coupled_rdevs = NULL;
d3d64537
MP		 5238}
5239
f9503385 5240static int regulator_init_coupling(struct regulator_dev *rdev)
d3d64537 5241{
7d819664 5242 struct regulator_dev **coupled;
d8ca7d18 5243 int err, n_phandles;
d3d64537
MP		 5244
5245 if (!IS_ENABLED(CONFIG_OF))
5246 n_phandles = 0;
5247 else
5248 n_phandles = of_get_n_coupled(rdev);
5249
7d819664
MM		 5250 coupled = kcalloc(n_phandles + 1, sizeof(*coupled), GFP_KERNEL);
5251 if (!coupled)
d8ca7d18 5252 return -ENOMEM;
d3d64537 5253
7d819664
MM		 5254 rdev->coupling_desc.coupled_rdevs = coupled;
5255
d3d64537
MP		 5256 /*
5257 * Every regulator should always have coupling descriptor filled with
5258 * at least pointer to itself.
5259 */
5260 rdev->coupling_desc.coupled_rdevs[0] = rdev;
5261 rdev->coupling_desc.n_coupled = n_phandles + 1;
5262 rdev->coupling_desc.n_resolved++;
5263
5264 /* regulator isn't coupled */
5265 if (n_phandles == 0)
5266 return 0;
5267
d8ca7d18 5268 if (!of_check_coupling_data(rdev))
d3d64537 5269 return -EPERM;
d3d64537 5270
73a32129 5271 mutex_lock(&regulator_list_mutex);
d8ca7d18 5272 rdev->coupling_desc.coupler = regulator_find_coupler(rdev);
73a32129
MM		 5273 mutex_unlock(&regulator_list_mutex);
5274
d8ca7d18
DO		 5275 if (IS_ERR(rdev->coupling_desc.coupler)) {
5276 err = PTR_ERR(rdev->coupling_desc.coupler);
61aab5ad 5277 rdev_err(rdev, "failed to get coupler: %pe\n", ERR_PTR(err));
d8ca7d18 5278 return err;
d3d64537
MP		 5279 }
5280
d8ca7d18
DO		 5281 return 0;
5282}
5283
5284static int generic_coupler_attach(struct regulator_coupler *coupler,
5285 struct regulator_dev *rdev)
5286{
5287 if (rdev->coupling_desc.n_coupled > 2) {
5288 rdev_err(rdev,
5289 "Voltage balancing for multiple regulator couples is unimplemented\n");
d3d64537 5290 return -EPERM;
d8ca7d18 5291 }
d3d64537 5292
e381bfe4
DO		 5293 if (!rdev->constraints->always_on) {
5294 rdev_err(rdev,
5295 "Coupling of a non always-on regulator is unimplemented\n");
5296 return -ENOTSUPP;
5297 }
5298
d3d64537
MP		 5299 return 0;
5300}
5301
d8ca7d18
DO		 5302static struct regulator_coupler generic_regulator_coupler = {
5303 .attach_regulator = generic_coupler_attach,
5304};
5305
414c70cb
LG		 5306/**
5307 * regulator_register - register regulator
69279fb9 5308 * @regulator_desc: regulator to register
f47531b1 5309 * @cfg: runtime configuration for regulator
414c70cb
LG		 5310 *
5311 * Called by regulator drivers to register a regulator.
0384618a
AL		 5312 * Returns a valid pointer to struct regulator_dev on success
5313 * or an ERR_PTR() on error.
414c70cb 5314 */
65f26846
MB		 5315struct regulator_dev *
5316regulator_register(const struct regulator_desc *regulator_desc,
1b3de223 5317 const struct regulator_config *cfg)
414c70cb 5318{
c172708d 5319 const struct regulator_init_data *init_data;
1b3de223 5320 struct regulator_config *config = NULL;
72dca06f 5321 static atomic_t regulator_no = ATOMIC_INIT(-1);
414c70cb 5322 struct regulator_dev *rdev;
0edb040d
LW		 5323 bool dangling_cfg_gpiod = false;
5324 bool dangling_of_gpiod = false;
32c8fad4 5325 struct device *dev;
a5766f11 5326 int ret, i;
414c70cb 5327
0edb040d 5328 if (cfg == NULL)
414c70cb 5329 return ERR_PTR(-EINVAL);
0edb040d
LW		 5330 if (cfg->ena_gpiod)
5331 dangling_cfg_gpiod = true;
5332 if (regulator_desc == NULL) {
5333 ret = -EINVAL;
5334 goto rinse;
5335 }
414c70cb 5336
1b3de223 5337 dev = cfg->dev;
dcf70112 5338 WARN_ON(!dev);
32c8fad4 5339
0edb040d
LW		 5340 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) {
5341 ret = -EINVAL;
5342 goto rinse;
5343 }
414c70cb 5344
cd78dfc6 5345 if (regulator_desc->type != REGULATOR_VOLTAGE &&
0edb040d
LW		 5346 regulator_desc->type != REGULATOR_CURRENT) {
5347 ret = -EINVAL;
5348 goto rinse;
5349 }
414c70cb 5350
476c2d83
MB		 5351 /* Only one of each should be implemented */
5352 WARN_ON(regulator_desc->ops->get_voltage &&
5353 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 5354 WARN_ON(regulator_desc->ops->set_voltage &&
5355 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 5356
5357 /* If we're using selectors we must implement list_voltage. */
5358 if (regulator_desc->ops->get_voltage_sel &&
5359 !regulator_desc->ops->list_voltage) {
0edb040d
LW		 5360 ret = -EINVAL;
5361 goto rinse;
476c2d83 5362 }
e8eef82b
MB		 5363 if (regulator_desc->ops->set_voltage_sel &&
5364 !regulator_desc->ops->list_voltage) {
0edb040d
LW		 5365 ret = -EINVAL;
5366 goto rinse;
e8eef82b 5367 }
476c2d83 5368
414c70cb 5369 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
0edb040d
LW		 5370 if (rdev == NULL) {
5371 ret = -ENOMEM;
5372 goto rinse;
5373 }
d3c73156 5374 device_initialize(&rdev->dev);
7111c6d1 5375 spin_lock_init(&rdev->err_lock);
414c70cb 5376
1b3de223
KK		 5377 /*
5378 * Duplicate the config so the driver could override it after
5379 * parsing init data.
5380 */
5381 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
5382 if (config == NULL) {
0edb040d 5383 ret = -ENOMEM;
d3c73156 5384 goto clean;
1b3de223
KK		 5385 }
5386
bfa21a0d 5387 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
a0c7b164 5388 &rdev->dev.of_node);
f8970d34
MF		 5389
5390 /*
5391 * Sometimes not all resources are probed already so we need to take
5392 * that into account. This happens most the time if the ena_gpiod comes
5393 * from a gpio extender or something else.
5394 */
5395 if (PTR_ERR(init_data) == -EPROBE_DEFER) {
f8970d34 5396 ret = -EPROBE_DEFER;
d3c73156 5397 goto clean;
f8970d34
MF		 5398 }
5399
0edb040d
LW		 5400 /*
5401 * We need to keep track of any GPIO descriptor coming from the
5402 * device tree until we have handled it over to the core. If the
5403 * config that was passed in to this function DOES NOT contain
5404 * a descriptor, and the config after this call DOES contain
48f1b4ef 5405 * a descriptor, we definitely got one from parsing the device
0edb040d
LW		 5406 * tree.
5407 */
5408 if (!cfg->ena_gpiod && config->ena_gpiod)
5409 dangling_of_gpiod = true;
a0c7b164
MB		 5410 if (!init_data) {
5411 init_data = config->init_data;
5412 rdev->dev.of_node = of_node_get(config->of_node);
5413 }
5414
f8702f9e 5415 ww_mutex_init(&rdev->mutex, &regulator_ww_class);
c172708d 5416 rdev->reg_data = config->driver_data;
414c70cb
LG		 5417 rdev->owner = regulator_desc->owner;
5418 rdev->desc = regulator_desc;
3a4b0a07
MB		 5419 if (config->regmap)
5420 rdev->regmap = config->regmap;
52b84dac 5421 else if (dev_get_regmap(dev, NULL))
3a4b0a07 5422 rdev->regmap = dev_get_regmap(dev, NULL);
52b84dac
AC		 5423 else if (dev->parent)
5424 rdev->regmap = dev_get_regmap(dev->parent, NULL);
414c70cb 5425 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 5426 INIT_LIST_HEAD(&rdev->list);
414c70cb 5427 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 5428 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 5429
a5766f11 5430 /* preform any regulator specific init */
9a8f5e07 5431 if (init_data && init_data->regulator_init) {
a5766f11 5432 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 5433 if (ret < 0)
5434 goto clean;
a5766f11
LG		 5435 }
5436
541d052d 5437 if (config->ena_gpiod) {
daad134d
KA		 5438 ret = regulator_ena_gpio_request(rdev, config);
5439 if (ret != 0) {
61aab5ad
MM		 5440 rdev_err(rdev, "Failed to request enable GPIO: %pe\n",
5441 ERR_PTR(ret));
32165230 5442 goto clean;
daad134d 5443 }
0edb040d
LW		 5444 /* The regulator core took over the GPIO descriptor */
5445 dangling_cfg_gpiod = false;
5446 dangling_of_gpiod = false;
daad134d
KA		 5447 }
5448
a5766f11 5449 /* register with sysfs */
414c70cb 5450 rdev->dev.class = &regulator_class;
a5766f11 5451 rdev->dev.parent = dev;
72dca06f 5452 dev_set_name(&rdev->dev, "regulator.%lu",
39138818 5453 (unsigned long) atomic_inc_return(&regulator_no));
9177514c 5454 dev_set_drvdata(&rdev->dev, rdev);
a5766f11 5455
74f544c1 5456 /* set regulator constraints */
9a8f5e07 5457 if (init_data)
57a6ad48
MM		 5458 rdev->constraints = kmemdup(&init_data->constraints,
5459 sizeof(*rdev->constraints),
5460 GFP_KERNEL);
5461 else
5462 rdev->constraints = kzalloc(sizeof(*rdev->constraints),
5463 GFP_KERNEL);
5464 if (!rdev->constraints) {
5465 ret = -ENOMEM;
5466 goto wash;
5467 }
9a8f5e07 5468
9a8f5e07 5469 if (init_data && init_data->supply_regulator)
6261b06d 5470 rdev->supply_name = init_data->supply_regulator;
69511a45 5471 else if (regulator_desc->supply_name)
6261b06d 5472 rdev->supply_name = regulator_desc->supply_name;
0178f3e2 5473
57a6ad48 5474 ret = set_machine_constraints(rdev);
aea6cb99
MM		 5475 if (ret == -EPROBE_DEFER) {
5476 /* Regulator might be in bypass mode and so needs its supply
69b8821e
SK		 5477 * to set the constraints
5478 */
aea6cb99
MM		 5479 /* FIXME: this currently triggers a chicken-and-egg problem
5480 * when creating -SUPPLY symlink in sysfs to a regulator
69b8821e
SK		 5481 * that is just being created
5482 */
0917c9db
MM		 5483 rdev_dbg(rdev, "will resolve supply early: %s\n",
5484 rdev->supply_name);
aea6cb99
MM		 5485 ret = regulator_resolve_supply(rdev);
5486 if (!ret)
57a6ad48 5487 ret = set_machine_constraints(rdev);
aea6cb99
MM		 5488 else
5489 rdev_dbg(rdev, "unable to resolve supply early: %pe\n",
5490 ERR_PTR(ret));
5491 }
45389c47
JH		 5492 if (ret < 0)
5493 goto wash;
5494
f9503385
DO		 5495 ret = regulator_init_coupling(rdev);
5496 if (ret < 0)
d3d64537
MP		 5497 goto wash;
5498
a5766f11 5499 /* add consumers devices */
9a8f5e07
MB		 5500 if (init_data) {
5501 for (i = 0; i < init_data->num_consumer_supplies; i++) {
5502 ret = set_consumer_device_supply(rdev,
9a8f5e07 5503 init_data->consumer_supplies[i].dev_name,
23c2f041 5504 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 5505 if (ret < 0) {
5506 dev_err(dev, "Failed to set supply %s\n",
5507 init_data->consumer_supplies[i].supply);
5508 goto unset_supplies;
5509 }
23c2f041 5510 }
414c70cb 5511 }
a5766f11 5512
fd086045
MK		 5513 if (!rdev->desc->ops->get_voltage &&
5514 !rdev->desc->ops->list_voltage &&
5515 !rdev->desc->fixed_uV)
5516 rdev->is_switch = true;
5517
9177514c
VZ		 5518 ret = device_add(&rdev->dev);
5519 if (ret != 0)
c438b9d0 5520 goto unset_supplies;
c438b9d0 5521
1130e5b3 5522 rdev_init_debugfs(rdev);
5e3ca2b3 5523
f9503385
DO		 5524 /* try to resolve regulators coupling since a new one was registered */
5525 mutex_lock(&regulator_list_mutex);
5526 regulator_resolve_coupling(rdev);
5527 mutex_unlock(&regulator_list_mutex);
5528
5e3ca2b3
JMC		 5529 /* try to resolve regulators supply since a new one was registered */
5530 class_for_each_device(&regulator_class, NULL, NULL,
5531 regulator_register_resolve_supply);
1b3de223 5532 kfree(config);
414c70cb 5533 return rdev;
4fca9545 5534
d4033b54 5535unset_supplies:
45389c47 5536 mutex_lock(&regulator_list_mutex);
d4033b54 5537 unset_regulator_supplies(rdev);
d8ca7d18 5538 regulator_remove_coupling(rdev);
45389c47 5539 mutex_unlock(&regulator_list_mutex);
32165230 5540wash:
26c2c997 5541 kfree(rdev->coupling_desc.coupled_rdevs);
45389c47 5542 mutex_lock(&regulator_list_mutex);
32165230 5543 regulator_ena_gpio_free(rdev);
45389c47 5544 mutex_unlock(&regulator_list_mutex);
4fca9545 5545clean:
0edb040d
LW		 5546 if (dangling_of_gpiod)
5547 gpiod_put(config->ena_gpiod);
a2151374 5548 kfree(config);
d3c73156 5549 put_device(&rdev->dev);
0edb040d
LW		 5550rinse:
5551 if (dangling_cfg_gpiod)
5552 gpiod_put(cfg->ena_gpiod);
a2151374 5553 return ERR_PTR(ret);
414c70cb
LG		 5554}
5555EXPORT_SYMBOL_GPL(regulator_register);
5556
5557/**
5558 * regulator_unregister - unregister regulator
69279fb9 5559 * @rdev: regulator to unregister
414c70cb
LG		 5560 *
5561 * Called by regulator drivers to unregister a regulator.
5562 */
5563void regulator_unregister(struct regulator_dev *rdev)
5564{
5565 if (rdev == NULL)
5566 return;
5567
891636ea
MB		 5568 if (rdev->supply) {
5569 while (rdev->use_count--)
5570 regulator_disable(rdev->supply);
e032b376 5571 regulator_put(rdev->supply);
891636ea 5572 }
ff9b34b6 5573
06377301
CK		 5574 flush_work(&rdev->disable_work.work);
5575
414c70cb 5576 mutex_lock(&regulator_list_mutex);
ff9b34b6 5577
1130e5b3 5578 debugfs_remove_recursive(rdev->debugfs);
6bf87d17 5579 WARN_ON(rdev->open_count);
6303f3e7 5580 regulator_remove_coupling(rdev);
0f1d747b 5581 unset_regulator_supplies(rdev);
414c70cb 5582 list_del(&rdev->list);
f19b00da 5583 regulator_ena_gpio_free(rdev);
58fb5cf5 5584 device_unregister(&rdev->dev);
ff9b34b6
DO		 5585
5586 mutex_unlock(&regulator_list_mutex);
414c70cb
LG		 5587}
5588EXPORT_SYMBOL_GPL(regulator_unregister);
5589
f7efad10 5590#ifdef CONFIG_SUSPEND
414c70cb 5591/**
0380cf7d 5592 * regulator_suspend - prepare regulators for system wide suspend
1efef7cc 5593 * @dev: ``&struct device`` pointer that is passed to _regulator_suspend()
414c70cb
LG		 5594 *
5595 * Configure each regulator with it's suspend operating parameters for state.
414c70cb 5596 */
0380cf7d 5597static int regulator_suspend(struct device *dev)
414c70cb 5598{
cd7e36ab 5599 struct regulator_dev *rdev = dev_to_rdev(dev);
f7efad10 5600 suspend_state_t state = pm_suspend_target_state;
cd7e36ab 5601 int ret;
0955f5be
SB		 5602 const struct regulator_state *rstate;
5603
5604 rstate = regulator_get_suspend_state_check(rdev, state);
5605 if (!rstate)
5606 return 0;
cd7e36ab
MS		 5607
5608 regulator_lock(rdev);
0955f5be 5609 ret = __suspend_set_state(rdev, rstate);
cd7e36ab 5610 regulator_unlock(rdev);
414c70cb 5611
cd7e36ab 5612 return ret;
85f3b431 5613}
d3e4eccb 5614
cd7e36ab 5615static int regulator_resume(struct device *dev)
85f3b431 5616{
cd7e36ab 5617 suspend_state_t state = pm_suspend_target_state;
85f3b431 5618 struct regulator_dev *rdev = dev_to_rdev(dev);
f7efad10 5619 struct regulator_state *rstate;
cd7e36ab 5620 int ret = 0;
f7efad10 5621
cd7e36ab 5622 rstate = regulator_get_suspend_state(rdev, state);
f7efad10 5623 if (rstate == NULL)
35b5f14e 5624 return 0;
414c70cb 5625
0955f5be
SB		 5626 /* Avoid grabbing the lock if we don't need to */
5627 if (!rdev->desc->ops->resume)
5628 return 0;
5629
66cf9a7e 5630 regulator_lock(rdev);
85f3b431 5631
0955f5be
SB		 5632 if (rstate->enabled == ENABLE_IN_SUSPEND ||
5633 rstate->enabled == DISABLE_IN_SUSPEND)
0380cf7d 5634 ret = rdev->desc->ops->resume(rdev);
f7efad10 5635
66cf9a7e 5636 regulator_unlock(rdev);
85f3b431 5637
f7efad10 5638 return ret;
414c70cb 5639}
f7efad10
CZ		 5640#else /* !CONFIG_SUSPEND */
5641
0380cf7d 5642#define regulator_suspend NULL
5643#define regulator_resume NULL
f7efad10
CZ		 5644
5645#endif /* !CONFIG_SUSPEND */
5646
5647#ifdef CONFIG_PM
5648static const struct dev_pm_ops __maybe_unused regulator_pm_ops = {
0380cf7d 5649 .suspend = regulator_suspend,
5650 .resume = regulator_resume,
f7efad10
CZ		 5651};
5652#endif
5653
285c22de 5654struct class regulator_class = {
f7efad10
CZ		 5655 .name = "regulator",
5656 .dev_release = regulator_dev_release,
5657 .dev_groups = regulator_dev_groups,
5658#ifdef CONFIG_PM
5659 .pm = &regulator_pm_ops,
5660#endif
5661};
ca725561
MB		 5662/**
5663 * regulator_has_full_constraints - the system has fully specified constraints
5664 *
5665 * Calling this function will cause the regulator API to disable all
5666 * regulators which have a zero use count and don't have an always_on
5667 * constraint in a late_initcall.
5668 *
5669 * The intention is that this will become the default behaviour in a
5670 * future kernel release so users are encouraged to use this facility
5671 * now.
5672 */
5673void regulator_has_full_constraints(void)
5674{
5675 has_full_constraints = 1;
5676}
5677EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
5678
414c70cb
LG		 5679/**
5680 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 5681 * @rdev: regulator
414c70cb
LG		 5682 *
5683 * Get rdev regulator driver private data. This call can be used in the
5684 * regulator driver context.
5685 */
5686void *rdev_get_drvdata(struct regulator_dev *rdev)
5687{
5688 return rdev->reg_data;
5689}
5690EXPORT_SYMBOL_GPL(rdev_get_drvdata);
5691
5692/**
5693 * regulator_get_drvdata - get regulator driver data
5694 * @regulator: regulator
5695 *
5696 * Get regulator driver private data. This call can be used in the consumer
5697 * driver context when non API regulator specific functions need to be called.
5698 */
5699void *regulator_get_drvdata(struct regulator *regulator)
5700{
5701 return regulator->rdev->reg_data;
5702}
5703EXPORT_SYMBOL_GPL(regulator_get_drvdata);
5704
5705/**
5706 * regulator_set_drvdata - set regulator driver data
5707 * @regulator: regulator
5708 * @data: data
5709 */
5710void regulator_set_drvdata(struct regulator *regulator, void *data)
5711{
5712 regulator->rdev->reg_data = data;
5713}
5714EXPORT_SYMBOL_GPL(regulator_set_drvdata);
5715
5716/**
d73e873b 5717 * rdev_get_id - get regulator ID
69279fb9 5718 * @rdev: regulator
414c70cb
LG		 5719 */
5720int rdev_get_id(struct regulator_dev *rdev)
5721{
5722 return rdev->desc->id;
5723}
5724EXPORT_SYMBOL_GPL(rdev_get_id);
5725
a5766f11
LG		 5726struct device *rdev_get_dev(struct regulator_dev *rdev)
5727{
5728 return &rdev->dev;
5729}
5730EXPORT_SYMBOL_GPL(rdev_get_dev);
5731
03c87b95
BG		 5732struct regmap *rdev_get_regmap(struct regulator_dev *rdev)
5733{
5734 return rdev->regmap;
5735}
5736EXPORT_SYMBOL_GPL(rdev_get_regmap);
5737
a5766f11
LG		 5738void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
5739{
5740 return reg_init_data->driver_data;
5741}
5742EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
5743
ba55a974 5744#ifdef CONFIG_DEBUG_FS
dbc55955 5745static int supply_map_show(struct seq_file *sf, void *data)
ba55a974 5746{
ba55a974
MB		 5747 struct regulator_map *map;
5748
ba55a974 5749 list_for_each_entry(map, &regulator_map_list, list) {
dbc55955
HZ		 5750 seq_printf(sf, "%s -> %s.%s\n",
5751 rdev_get_name(map->regulator), map->dev_name,
5752 map->supply);
ba55a974
MB		 5753 }
5754
dbc55955
HZ		 5755 return 0;
5756}
3e60b4fc 5757DEFINE_SHOW_ATTRIBUTE(supply_map);
ba55a974 5758
85f3b431
TV		 5759struct summary_data {
5760 struct seq_file *s;
5761 struct regulator_dev *parent;
5762 int level;
5763};
5764
5765static void regulator_summary_show_subtree(struct seq_file *s,
5766 struct regulator_dev *rdev,
5767 int level);
5768
5769static int regulator_summary_show_children(struct device *dev, void *data)
5770{
5771 struct regulator_dev *rdev = dev_to_rdev(dev);
5772 struct summary_data *summary_data = data;
5773
5774 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
5775 regulator_summary_show_subtree(summary_data->s, rdev,
5776 summary_data->level + 1);
5777
5778 return 0;
5779}
5780
7c225ec9
HS		 5781static void regulator_summary_show_subtree(struct seq_file *s,
5782 struct regulator_dev *rdev,
5783 int level)
5784{
7c225ec9
HS		 5785 struct regulation_constraints *c;
5786 struct regulator *consumer;
85f3b431 5787 struct summary_data summary_data;
7e4d9683 5788 unsigned int opmode;
7c225ec9
HS		 5789
5790 if (!rdev)
5791 return;
5792
7e4d9683 5793 opmode = _regulator_get_mode_unlocked(rdev);
01de19d0 5794 seq_printf(s, "%*s%-*s %3d %4d %6d %7s ",
7c225ec9
HS		 5795 level * 3 + 1, "",
5796 30 - level * 3, rdev_get_name(rdev),
01de19d0 5797 rdev->use_count, rdev->open_count, rdev->bypass_count,
7e4d9683 5798 regulator_opmode_to_str(opmode));
7c225ec9 5799
d22b85a1 5800 seq_printf(s, "%5dmV ", regulator_get_voltage_rdev(rdev) / 1000);
7e4d9683
DA		 5801 seq_printf(s, "%5dmA ",
5802 _regulator_get_current_limit_unlocked(rdev) / 1000);
7c225ec9
HS		 5803
5804 c = rdev->constraints;
5805 if (c) {
5806 switch (rdev->desc->type) {
5807 case REGULATOR_VOLTAGE:
5808 seq_printf(s, "%5dmV %5dmV ",
5809 c->min_uV / 1000, c->max_uV / 1000);
5810 break;
5811 case REGULATOR_CURRENT:
5812 seq_printf(s, "%5dmA %5dmA ",
5813 c->min_uA / 1000, c->max_uA / 1000);
5814 break;
5815 }
5816 }
5817
5818 seq_puts(s, "\n");
5819
5820 list_for_each_entry(consumer, &rdev->consumer_list, list) {
e42a46b6 5821 if (consumer->dev && consumer->dev->class == &regulator_class)
7c225ec9
HS		 5822 continue;
5823
5824 seq_printf(s, "%*s%-*s ",
5825 (level + 1) * 3 + 1, "",
e42a46b6 5826 30 - (level + 1) * 3,
6b576eb0 5827 consumer->supply_name ? consumer->supply_name :
e42a46b6 5828 consumer->dev ? dev_name(consumer->dev) : "deviceless");
7c225ec9
HS		 5829
5830 switch (rdev->desc->type) {
5831 case REGULATOR_VOLTAGE:
5451781d
DA		 5832 seq_printf(s, "%3d %33dmA%c%5dmV %5dmV",
5833 consumer->enable_count,
7d3827b5 5834 consumer->uA_load / 1000,
5451781d
DA		 5835 consumer->uA_load && !consumer->enable_count ?
5836 '*' : ' ',
c360a6df
CZ		 5837 consumer->voltage[PM_SUSPEND_ON].min_uV / 1000,
5838 consumer->voltage[PM_SUSPEND_ON].max_uV / 1000);
7c225ec9
HS		 5839 break;
5840 case REGULATOR_CURRENT:
7c225ec9
HS		 5841 break;
5842 }
5843
5844 seq_puts(s, "\n");
5845 }
5846
85f3b431
TV		 5847 summary_data.s = s;
5848 summary_data.level = level;
5849 summary_data.parent = rdev;
7c225ec9 5850
85f3b431
TV		 5851 class_for_each_device(&regulator_class, NULL, &summary_data,
5852 regulator_summary_show_children);
f8702f9e
DO		 5853}
5854
5855struct summary_lock_data {
5856 struct ww_acquire_ctx *ww_ctx;
5857 struct regulator_dev **new_contended_rdev;
5858 struct regulator_dev **old_contended_rdev;
5859};
5860
5861static int regulator_summary_lock_one(struct device *dev, void *data)
5862{
5863 struct regulator_dev *rdev = dev_to_rdev(dev);
5864 struct summary_lock_data *lock_data = data;
5865 int ret = 0;
5866
5867 if (rdev != *lock_data->old_contended_rdev) {
5868 ret = regulator_lock_nested(rdev, lock_data->ww_ctx);
5869
5870 if (ret == -EDEADLK)
5871 *lock_data->new_contended_rdev = rdev;
5872 else
5873 WARN_ON_ONCE(ret);
5874 } else {
5875 *lock_data->old_contended_rdev = NULL;
5876 }
5877
5878 return ret;
5879}
5880
5881static int regulator_summary_unlock_one(struct device *dev, void *data)
5882{
5883 struct regulator_dev *rdev = dev_to_rdev(dev);
5884 struct summary_lock_data *lock_data = data;
5885
5886 if (lock_data) {
5887 if (rdev == *lock_data->new_contended_rdev)
5888 return -EDEADLK;
5889 }
7e4d9683
DA		 5890
5891 regulator_unlock(rdev);
f8702f9e
DO		 5892
5893 return 0;
5894}
5895
5896static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx,
5897 struct regulator_dev **new_contended_rdev,
5898 struct regulator_dev **old_contended_rdev)
5899{
5900 struct summary_lock_data lock_data;
5901 int ret;
5902
5903 lock_data.ww_ctx = ww_ctx;
5904 lock_data.new_contended_rdev = new_contended_rdev;
5905 lock_data.old_contended_rdev = old_contended_rdev;
5906
5907 ret = class_for_each_device(&regulator_class, NULL, &lock_data,
5908 regulator_summary_lock_one);
5909 if (ret)
5910 class_for_each_device(&regulator_class, NULL, &lock_data,
5911 regulator_summary_unlock_one);
5912
5913 return ret;
5914}
5915
5916static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx)
5917{
5918 struct regulator_dev *new_contended_rdev = NULL;
5919 struct regulator_dev *old_contended_rdev = NULL;
5920 int err;
5921
ff9b34b6
DO		 5922 mutex_lock(&regulator_list_mutex);
5923
f8702f9e
DO		 5924 ww_acquire_init(ww_ctx, &regulator_ww_class);
5925
5926 do {
5927 if (new_contended_rdev) {
5928 ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx);
5929 old_contended_rdev = new_contended_rdev;
5930 old_contended_rdev->ref_cnt++;
5931 }
5932
5933 err = regulator_summary_lock_all(ww_ctx,
5934 &new_contended_rdev,
5935 &old_contended_rdev);
5936
5937 if (old_contended_rdev)
5938 regulator_unlock(old_contended_rdev);
5939
5940 } while (err == -EDEADLK);
5941
5942 ww_acquire_done(ww_ctx);
5943}
5944
5945static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx)
5946{
5947 class_for_each_device(&regulator_class, NULL, NULL,
5948 regulator_summary_unlock_one);
5949 ww_acquire_fini(ww_ctx);
ff9b34b6
DO		 5950
5951 mutex_unlock(&regulator_list_mutex);
7c225ec9
HS		 5952}
5953
85f3b431 5954static int regulator_summary_show_roots(struct device *dev, void *data)
7c225ec9 5955{
85f3b431
TV		 5956 struct regulator_dev *rdev = dev_to_rdev(dev);
5957 struct seq_file *s = data;
7c225ec9 5958
85f3b431
TV		 5959 if (!rdev->supply)
5960 regulator_summary_show_subtree(s, rdev, 0);
7c225ec9 5961
85f3b431
TV		 5962 return 0;
5963}
7c225ec9 5964
85f3b431
TV		 5965static int regulator_summary_show(struct seq_file *s, void *data)
5966{
f8702f9e
DO		 5967 struct ww_acquire_ctx ww_ctx;
5968
01de19d0
DA		 5969 seq_puts(s, " regulator use open bypass opmode voltage current min max\n");
5970 seq_puts(s, "---------------------------------------------------------------------------------------\n");
7c225ec9 5971
f8702f9e
DO		 5972 regulator_summary_lock(&ww_ctx);
5973
85f3b431
TV		 5974 class_for_each_device(&regulator_class, NULL, s,
5975 regulator_summary_show_roots);
7c225ec9 5976
f8702f9e
DO		 5977 regulator_summary_unlock(&ww_ctx);
5978
7c225ec9
HS		 5979 return 0;
5980}
3e60b4fc
YL		 5981DEFINE_SHOW_ATTRIBUTE(regulator_summary);
5982#endif /* CONFIG_DEBUG_FS */
7c225ec9 5983
414c70cb
LG		 5984static int __init regulator_init(void)
5985{
34abbd68
MB		 5986 int ret;
5987
34abbd68
MB		 5988 ret = class_register(&regulator_class);
5989
1130e5b3 5990 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 5991 if (!debugfs_root)
1130e5b3 5992 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 5993
3e60b4fc 5994#ifdef CONFIG_DEBUG_FS
f4d562c6
MB		 5995 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
5996 &supply_map_fops);
1130e5b3 5997
7c225ec9 5998 debugfs_create_file("regulator_summary", 0444, debugfs_root,
85f3b431 5999 NULL, &regulator_summary_fops);
3e60b4fc 6000#endif
34abbd68
MB		 6001 regulator_dummy_init();
6002
d8ca7d18
DO		 6003 regulator_coupler_register(&generic_regulator_coupler);
6004
34abbd68 6005 return ret;
414c70cb
LG		 6006}
6007
6008/* init early to allow our consumers to complete system booting */
6009core_initcall(regulator_init);
ca725561 6010
55576cf1 6011static int regulator_late_cleanup(struct device *dev, void *data)
ca725561 6012{
609ca5f3
MB		 6013 struct regulator_dev *rdev = dev_to_rdev(dev);
6014 const struct regulator_ops *ops = rdev->desc->ops;
6015 struct regulation_constraints *c = rdev->constraints;
ca725561 6016 int enabled, ret;
ca725561 6017
609ca5f3
MB		 6018 if (c && c->always_on)
6019 return 0;
6020
8a34e979 6021 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS))
609ca5f3
MB		 6022 return 0;
6023
66cf9a7e 6024 regulator_lock(rdev);
609ca5f3
MB		 6025
6026 if (rdev->use_count)
6027 goto unlock;
6028
c088a498 6029 /* If we can't read the status assume it's always on. */
609ca5f3
MB		 6030 if (ops->is_enabled)
6031 enabled = ops->is_enabled(rdev);
6032 else
6033 enabled = 1;
6034
c088a498
PHS		 6035 /* But if reading the status failed, assume that it's off. */
6036 if (enabled <= 0)
609ca5f3
MB		 6037 goto unlock;
6038
6039 if (have_full_constraints()) {
6040 /* We log since this may kill the system if it goes
69b8821e
SK		 6041 * wrong.
6042 */
609ca5f3
MB		 6043 rdev_info(rdev, "disabling\n");
6044 ret = _regulator_do_disable(rdev);
6045 if (ret != 0)
61aab5ad 6046 rdev_err(rdev, "couldn't disable: %pe\n", ERR_PTR(ret));
609ca5f3
MB		 6047 } else {
6048 /* The intention is that in future we will
6049 * assume that full constraints are provided
6050 * so warn even if we aren't going to do
6051 * anything here.
6052 */
6053 rdev_warn(rdev, "incomplete constraints, leaving on\n");
6054 }
6055
6056unlock:
66cf9a7e 6057 regulator_unlock(rdev);
609ca5f3
MB		 6058
6059 return 0;
6060}
6061
55576cf1 6062static void regulator_init_complete_work_function(struct work_struct *work)
609ca5f3 6063{
3827b64d
JMC		 6064 /*
6065 * Regulators may had failed to resolve their input supplies
6066 * when were registered, either because the input supply was
6067 * not registered yet or because its parent device was not
6068 * bound yet. So attempt to resolve the input supplies for
6069 * pending regulators before trying to disable unused ones.
6070 */
6071 class_for_each_device(&regulator_class, NULL, NULL,
6072 regulator_register_resolve_supply);
6073
ca725561 6074 /* If we have a full configuration then disable any regulators
e9535834
MB		 6075 * we have permission to change the status for and which are
6076 * not in use or always_on. This is effectively the default
6077 * for DT and ACPI as they have full constraints.
ca725561 6078 */
609ca5f3
MB		 6079 class_for_each_device(&regulator_class, NULL, NULL,
6080 regulator_late_cleanup);
55576cf1
MB		 6081}
6082
6083static DECLARE_DELAYED_WORK(regulator_init_complete_work,
6084 regulator_init_complete_work_function);
6085
6086static int __init regulator_init_complete(void)
6087{
6088 /*
6089 * Since DT doesn't provide an idiomatic mechanism for
6090 * enabling full constraints and since it's much more natural
6091 * with DT to provide them just assume that a DT enabled
6092 * system has full constraints.
6093 */
6094 if (of_have_populated_dt())
6095 has_full_constraints = true;
6096
6097 /*
2a15483b
JS		 6098 * We punt completion for an arbitrary amount of time since
6099 * systems like distros will load many drivers from userspace
6100 * so consumers might not always be ready yet, this is
6101 * particularly an issue with laptops where this might bounce
6102 * the display off then on. Ideally we'd get a notification
6103 * from userspace when this happens but we don't so just wait
6104 * a bit and hope we waited long enough. It'd be better if
6105 * we'd only do this on systems that need it, and a kernel
6106 * command line option might be useful.
55576cf1 6107 */
2a15483b
JS		 6108 schedule_delayed_work(&regulator_init_complete_work,
6109 msecs_to_jiffies(30000));
ca725561
MB		 6110
6111 return 0;
6112}
fd482a3e 6113late_initcall_sync(regulator_init_complete);
Linux 6.x block layer and io_uring tree(s)