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Merge branch 'topic/bypass' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[linux-2.6-block.git] / drivers / regulator / core.c
CommitLineData
414c70cb
LG		 1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
a5766f11 5 * Copyright 2008 SlimLogic Ltd.
414c70cb 6 *
a5766f11 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
414c70cb
LG		 8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
1130e5b3 18#include <linux/debugfs.h>
414c70cb 19#include <linux/device.h>
5a0e3ad6 20#include <linux/slab.h>
f21e0e81 21#include <linux/async.h>
414c70cb
LG		 22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
31aae2be 25#include <linux/delay.h>
65f73508 26#include <linux/gpio.h>
778b28b4 27#include <linux/gpio/consumer.h>
69511a45 28#include <linux/of.h>
65b19ce6 29#include <linux/regmap.h>
69511a45 30#include <linux/regulator/of_regulator.h>
414c70cb
LG		 31#include <linux/regulator/consumer.h>
32#include <linux/regulator/driver.h>
33#include <linux/regulator/machine.h>
65602c32 34#include <linux/module.h>
414c70cb 35
02fa3ec0
MB		 36#define CREATE_TRACE_POINTS
37#include <trace/events/regulator.h>
38
34abbd68 39#include "dummy.h"
0cdfcc0f 40#include "internal.h"
34abbd68 41
7d51a0db
MB		 42#define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
5da84fd9
JP		 44#define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50#define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
52
414c70cb 53static DEFINE_MUTEX(regulator_list_mutex);
414c70cb 54static LIST_HEAD(regulator_map_list);
f19b00da 55static LIST_HEAD(regulator_ena_gpio_list);
a06ccd9c 56static LIST_HEAD(regulator_supply_alias_list);
21cf891a 57static bool has_full_constraints;
414c70cb 58
1130e5b3 59static struct dentry *debugfs_root;
1130e5b3 60
85f3b431
TV		 61static struct class regulator_class;
62
8dc5390d 63/*
414c70cb
LG		 64 * struct regulator_map
65 *
66 * Used to provide symbolic supply names to devices.
67 */
68struct regulator_map {
69 struct list_head list;
40f9244f 70 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 71 const char *supply;
a5766f11 72 struct regulator_dev *regulator;
414c70cb
LG		 73};
74
f19b00da
KM		 75/*
76 * struct regulator_enable_gpio
77 *
78 * Management for shared enable GPIO pin
79 */
80struct regulator_enable_gpio {
81 struct list_head list;
778b28b4 82 struct gpio_desc *gpiod;
f19b00da
KM		 83 u32 enable_count; /* a number of enabled shared GPIO */
84 u32 request_count; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert:1;
86};
87
a06ccd9c
CK		 88/*
89 * struct regulator_supply_alias
90 *
91 * Used to map lookups for a supply onto an alternative device.
92 */
93struct regulator_supply_alias {
94 struct list_head list;
95 struct device *src_dev;
96 const char *src_supply;
97 struct device *alias_dev;
98 const char *alias_supply;
99};
100
414c70cb 101static int _regulator_is_enabled(struct regulator_dev *rdev);
3801b86a 102static int _regulator_disable(struct regulator_dev *rdev);
414c70cb
LG		 103static int _regulator_get_voltage(struct regulator_dev *rdev);
104static int _regulator_get_current_limit(struct regulator_dev *rdev);
105static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
7179569a 106static int _notifier_call_chain(struct regulator_dev *rdev,
414c70cb 107 unsigned long event, void *data);
75790251
MB		 108static int _regulator_do_set_voltage(struct regulator_dev *rdev,
109 int min_uV, int max_uV);
3801b86a
MB		 110static struct regulator *create_regulator(struct regulator_dev *rdev,
111 struct device *dev,
112 const char *supply_name);
36a1f1b6 113static void _regulator_put(struct regulator *regulator);
414c70cb 114
609ca5f3
MB		 115static struct regulator_dev *dev_to_rdev(struct device *dev)
116{
117 return container_of(dev, struct regulator_dev, dev);
118}
414c70cb 119
1083c393
MB		 120static const char *rdev_get_name(struct regulator_dev *rdev)
121{
122 if (rdev->constraints && rdev->constraints->name)
123 return rdev->constraints->name;
124 else if (rdev->desc->name)
125 return rdev->desc->name;
126 else
127 return "";
128}
129
87b28417
MB		 130static bool have_full_constraints(void)
131{
75bc9641 132 return has_full_constraints || of_have_populated_dt();
87b28417
MB		 133}
134
70a7fb80
TR		 135static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev)
136{
137 if (rdev && rdev->supply)
138 return rdev->supply->rdev;
139
140 return NULL;
141}
142
9f01cd4a
SH		 143/**
144 * regulator_lock_supply - lock a regulator and its supplies
145 * @rdev: regulator source
146 */
147static void regulator_lock_supply(struct regulator_dev *rdev)
148{
fa731ac7 149 int i;
9f01cd4a 150
70a7fb80 151 for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++)
fa731ac7 152 mutex_lock_nested(&rdev->mutex, i);
9f01cd4a
SH		 153}
154
155/**
156 * regulator_unlock_supply - unlock a regulator and its supplies
157 * @rdev: regulator source
158 */
159static void regulator_unlock_supply(struct regulator_dev *rdev)
160{
161 struct regulator *supply;
162
163 while (1) {
164 mutex_unlock(&rdev->mutex);
165 supply = rdev->supply;
166
167 if (!rdev->supply)
168 return;
169
170 rdev = supply->rdev;
171 }
172}
173
69511a45
RN		 174/**
175 * of_get_regulator - get a regulator device node based on supply name
176 * @dev: Device pointer for the consumer (of regulator) device
177 * @supply: regulator supply name
178 *
179 * Extract the regulator device node corresponding to the supply name.
167d41dc 180 * returns the device node corresponding to the regulator if found, else
69511a45
RN		 181 * returns NULL.
182 */
183static struct device_node *of_get_regulator(struct device *dev, const char *supply)
184{
185 struct device_node *regnode = NULL;
186 char prop_name[32]; /* 32 is max size of property name */
187
188 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
189
190 snprintf(prop_name, 32, "%s-supply", supply);
191 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
192
193 if (!regnode) {
16fbcc3b 194 dev_dbg(dev, "Looking up %s property in node %s failed",
69511a45
RN		 195 prop_name, dev->of_node->full_name);
196 return NULL;
197 }
198 return regnode;
199}
200
6492bc1b
MB		 201static int _regulator_can_change_status(struct regulator_dev *rdev)
202{
203 if (!rdev->constraints)
204 return 0;
205
206 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
207 return 1;
208 else
209 return 0;
210}
211
414c70cb
LG		 212/* Platform voltage constraint check */
213static int regulator_check_voltage(struct regulator_dev *rdev,
214 int *min_uV, int *max_uV)
215{
216 BUG_ON(*min_uV > *max_uV);
217
218 if (!rdev->constraints) {
5da84fd9 219 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 220 return -ENODEV;
221 }
222 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
7ebcf26c 223 rdev_err(rdev, "voltage operation not allowed\n");
414c70cb
LG		 224 return -EPERM;
225 }
226
227 if (*max_uV > rdev->constraints->max_uV)
228 *max_uV = rdev->constraints->max_uV;
229 if (*min_uV < rdev->constraints->min_uV)
230 *min_uV = rdev->constraints->min_uV;
231
89f425ed
MB		 232 if (*min_uV > *max_uV) {
233 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 234 *min_uV, *max_uV);
414c70cb 235 return -EINVAL;
89f425ed 236 }
414c70cb
LG		 237
238 return 0;
239}
240
05fda3b1
TP		 241/* Make sure we select a voltage that suits the needs of all
242 * regulator consumers
243 */
244static int regulator_check_consumers(struct regulator_dev *rdev,
245 int *min_uV, int *max_uV)
246{
247 struct regulator *regulator;
248
249 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4aa922c0
MB		 250 /*
251 * Assume consumers that didn't say anything are OK
252 * with anything in the constraint range.
253 */
254 if (!regulator->min_uV && !regulator->max_uV)
255 continue;
256
05fda3b1
TP		 257 if (*max_uV > regulator->max_uV)
258 *max_uV = regulator->max_uV;
259 if (*min_uV < regulator->min_uV)
260 *min_uV = regulator->min_uV;
261 }
262
dd8004af 263 if (*min_uV > *max_uV) {
9c7b4e8a
RD		 264 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
265 *min_uV, *max_uV);
05fda3b1 266 return -EINVAL;
dd8004af 267 }
05fda3b1
TP		 268
269 return 0;
270}
271
414c70cb
LG		 272/* current constraint check */
273static int regulator_check_current_limit(struct regulator_dev *rdev,
274 int *min_uA, int *max_uA)
275{
276 BUG_ON(*min_uA > *max_uA);
277
278 if (!rdev->constraints) {
5da84fd9 279 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 280 return -ENODEV;
281 }
282 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
7ebcf26c 283 rdev_err(rdev, "current operation not allowed\n");
414c70cb
LG		 284 return -EPERM;
285 }
286
287 if (*max_uA > rdev->constraints->max_uA)
288 *max_uA = rdev->constraints->max_uA;
289 if (*min_uA < rdev->constraints->min_uA)
290 *min_uA = rdev->constraints->min_uA;
291
89f425ed
MB		 292 if (*min_uA > *max_uA) {
293 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 294 *min_uA, *max_uA);
414c70cb 295 return -EINVAL;
89f425ed 296 }
414c70cb
LG		 297
298 return 0;
299}
300
301/* operating mode constraint check */
2c608234 302static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 303{
2c608234 304 switch (*mode) {
e573520b
DB		 305 case REGULATOR_MODE_FAST:
306 case REGULATOR_MODE_NORMAL:
307 case REGULATOR_MODE_IDLE:
308 case REGULATOR_MODE_STANDBY:
309 break;
310 default:
89f425ed 311 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 312 return -EINVAL;
313 }
314
414c70cb 315 if (!rdev->constraints) {
5da84fd9 316 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 317 return -ENODEV;
318 }
319 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
7ebcf26c 320 rdev_err(rdev, "mode operation not allowed\n");
414c70cb
LG		 321 return -EPERM;
322 }
2c608234
MB		 323
324 /* The modes are bitmasks, the most power hungry modes having
325 * the lowest values. If the requested mode isn't supported
326 * try higher modes. */
327 while (*mode) {
328 if (rdev->constraints->valid_modes_mask & *mode)
329 return 0;
330 *mode /= 2;
414c70cb 331 }
2c608234
MB		 332
333 return -EINVAL;
414c70cb
LG		 334}
335
336/* dynamic regulator mode switching constraint check */
337static int regulator_check_drms(struct regulator_dev *rdev)
338{
339 if (!rdev->constraints) {
5da84fd9 340 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 341 return -ENODEV;
342 }
343 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
7ebcf26c 344 rdev_dbg(rdev, "drms operation not allowed\n");
414c70cb
LG		 345 return -EPERM;
346 }
347 return 0;
348}
349
414c70cb
LG		 350static ssize_t regulator_uV_show(struct device *dev,
351 struct device_attribute *attr, char *buf)
352{
a5766f11 353 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 354 ssize_t ret;
355
356 mutex_lock(&rdev->mutex);
357 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
358 mutex_unlock(&rdev->mutex);
359
360 return ret;
361}
7ad68e2f 362static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 363
364static ssize_t regulator_uA_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
366{
a5766f11 367 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 368
369 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
370}
7ad68e2f 371static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 372
587cea27
GKH		 373static ssize_t name_show(struct device *dev, struct device_attribute *attr,
374 char *buf)
bc558a60
MB		 375{
376 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 377
1083c393 378 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60 379}
587cea27 380static DEVICE_ATTR_RO(name);
bc558a60 381
4fca9545 382static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 383{
414c70cb
LG		 384 switch (mode) {
385 case REGULATOR_MODE_FAST:
386 return sprintf(buf, "fast\n");
387 case REGULATOR_MODE_NORMAL:
388 return sprintf(buf, "normal\n");
389 case REGULATOR_MODE_IDLE:
390 return sprintf(buf, "idle\n");
391 case REGULATOR_MODE_STANDBY:
392 return sprintf(buf, "standby\n");
393 }
394 return sprintf(buf, "unknown\n");
395}
396
4fca9545
DB		 397static ssize_t regulator_opmode_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
414c70cb 399{
a5766f11 400 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 401
4fca9545
DB		 402 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
403}
7ad68e2f 404static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 405
406static ssize_t regulator_print_state(char *buf, int state)
407{
414c70cb
LG		 408 if (state > 0)
409 return sprintf(buf, "enabled\n");
410 else if (state == 0)
411 return sprintf(buf, "disabled\n");
412 else
413 return sprintf(buf, "unknown\n");
414}
415
4fca9545
DB		 416static ssize_t regulator_state_show(struct device *dev,
417 struct device_attribute *attr, char *buf)
418{
419 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 420 ssize_t ret;
421
422 mutex_lock(&rdev->mutex);
423 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
424 mutex_unlock(&rdev->mutex);
4fca9545 425
9332546f 426 return ret;
4fca9545 427}
7ad68e2f 428static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 429
853116a1
DB		 430static ssize_t regulator_status_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
432{
433 struct regulator_dev *rdev = dev_get_drvdata(dev);
434 int status;
435 char *label;
436
437 status = rdev->desc->ops->get_status(rdev);
438 if (status < 0)
439 return status;
440
441 switch (status) {
442 case REGULATOR_STATUS_OFF:
443 label = "off";
444 break;
445 case REGULATOR_STATUS_ON:
446 label = "on";
447 break;
448 case REGULATOR_STATUS_ERROR:
449 label = "error";
450 break;
451 case REGULATOR_STATUS_FAST:
452 label = "fast";
453 break;
454 case REGULATOR_STATUS_NORMAL:
455 label = "normal";
456 break;
457 case REGULATOR_STATUS_IDLE:
458 label = "idle";
459 break;
460 case REGULATOR_STATUS_STANDBY:
461 label = "standby";
462 break;
f59c8f9f
MB		 463 case REGULATOR_STATUS_BYPASS:
464 label = "bypass";
465 break;
1beaf762
KG		 466 case REGULATOR_STATUS_UNDEFINED:
467 label = "undefined";
468 break;
853116a1
DB		 469 default:
470 return -ERANGE;
471 }
472
473 return sprintf(buf, "%s\n", label);
474}
475static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
476
414c70cb
LG		 477static ssize_t regulator_min_uA_show(struct device *dev,
478 struct device_attribute *attr, char *buf)
479{
a5766f11 480 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 481
482 if (!rdev->constraints)
483 return sprintf(buf, "constraint not defined\n");
484
485 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
486}
7ad68e2f 487static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 488
489static ssize_t regulator_max_uA_show(struct device *dev,
490 struct device_attribute *attr, char *buf)
491{
a5766f11 492 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 493
494 if (!rdev->constraints)
495 return sprintf(buf, "constraint not defined\n");
496
497 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
498}
7ad68e2f 499static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 500
501static ssize_t regulator_min_uV_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
503{
a5766f11 504 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 505
506 if (!rdev->constraints)
507 return sprintf(buf, "constraint not defined\n");
508
509 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
510}
7ad68e2f 511static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 512
513static ssize_t regulator_max_uV_show(struct device *dev,
514 struct device_attribute *attr, char *buf)
515{
a5766f11 516 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 517
518 if (!rdev->constraints)
519 return sprintf(buf, "constraint not defined\n");
520
521 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
522}
7ad68e2f 523static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 524
525static ssize_t regulator_total_uA_show(struct device *dev,
526 struct device_attribute *attr, char *buf)
527{
a5766f11 528 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 529 struct regulator *regulator;
530 int uA = 0;
531
532 mutex_lock(&rdev->mutex);
533 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 534 uA += regulator->uA_load;
414c70cb
LG		 535 mutex_unlock(&rdev->mutex);
536 return sprintf(buf, "%d\n", uA);
537}
7ad68e2f 538static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb 539
587cea27
GKH		 540static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
541 char *buf)
414c70cb 542{
a5766f11 543 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 544 return sprintf(buf, "%d\n", rdev->use_count);
545}
587cea27 546static DEVICE_ATTR_RO(num_users);
414c70cb 547
587cea27
GKH		 548static ssize_t type_show(struct device *dev, struct device_attribute *attr,
549 char *buf)
414c70cb 550{
a5766f11 551 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 552
553 switch (rdev->desc->type) {
554 case REGULATOR_VOLTAGE:
555 return sprintf(buf, "voltage\n");
556 case REGULATOR_CURRENT:
557 return sprintf(buf, "current\n");
558 }
559 return sprintf(buf, "unknown\n");
560}
587cea27 561static DEVICE_ATTR_RO(type);
414c70cb
LG		 562
563static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
564 struct device_attribute *attr, char *buf)
565{
a5766f11 566 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 567
414c70cb
LG		 568 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
569}
7ad68e2f
DB		 570static DEVICE_ATTR(suspend_mem_microvolts, 0444,
571 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 572
573static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
574 struct device_attribute *attr, char *buf)
575{
a5766f11 576 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 577
414c70cb
LG		 578 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
579}
7ad68e2f
DB		 580static DEVICE_ATTR(suspend_disk_microvolts, 0444,
581 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 582
583static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
584 struct device_attribute *attr, char *buf)
585{
a5766f11 586 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 587
414c70cb
LG		 588 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
589}
7ad68e2f
DB		 590static DEVICE_ATTR(suspend_standby_microvolts, 0444,
591 regulator_suspend_standby_uV_show, NULL);
414c70cb 592
414c70cb
LG		 593static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
594 struct device_attribute *attr, char *buf)
595{
a5766f11 596 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 597
4fca9545
DB		 598 return regulator_print_opmode(buf,
599 rdev->constraints->state_mem.mode);
414c70cb 600}
7ad68e2f
DB		 601static DEVICE_ATTR(suspend_mem_mode, 0444,
602 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 603
604static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
605 struct device_attribute *attr, char *buf)
606{
a5766f11 607 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 608
4fca9545
DB		 609 return regulator_print_opmode(buf,
610 rdev->constraints->state_disk.mode);
414c70cb 611}
7ad68e2f
DB		 612static DEVICE_ATTR(suspend_disk_mode, 0444,
613 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 614
615static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
616 struct device_attribute *attr, char *buf)
617{
a5766f11 618 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 619
4fca9545
DB		 620 return regulator_print_opmode(buf,
621 rdev->constraints->state_standby.mode);
414c70cb 622}
7ad68e2f
DB		 623static DEVICE_ATTR(suspend_standby_mode, 0444,
624 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 625
626static ssize_t regulator_suspend_mem_state_show(struct device *dev,
627 struct device_attribute *attr, char *buf)
628{
a5766f11 629 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 630
4fca9545
DB		 631 return regulator_print_state(buf,
632 rdev->constraints->state_mem.enabled);
414c70cb 633}
7ad68e2f
DB		 634static DEVICE_ATTR(suspend_mem_state, 0444,
635 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 636
637static ssize_t regulator_suspend_disk_state_show(struct device *dev,
638 struct device_attribute *attr, char *buf)
639{
a5766f11 640 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 641
4fca9545
DB		 642 return regulator_print_state(buf,
643 rdev->constraints->state_disk.enabled);
414c70cb 644}
7ad68e2f
DB		 645static DEVICE_ATTR(suspend_disk_state, 0444,
646 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 647
648static ssize_t regulator_suspend_standby_state_show(struct device *dev,
649 struct device_attribute *attr, char *buf)
650{
a5766f11 651 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 652
4fca9545
DB		 653 return regulator_print_state(buf,
654 rdev->constraints->state_standby.enabled);
414c70cb 655}
7ad68e2f
DB		 656static DEVICE_ATTR(suspend_standby_state, 0444,
657 regulator_suspend_standby_state_show, NULL);
658
f59c8f9f
MB		 659static ssize_t regulator_bypass_show(struct device *dev,
660 struct device_attribute *attr, char *buf)
661{
662 struct regulator_dev *rdev = dev_get_drvdata(dev);
663 const char *report;
664 bool bypass;
665 int ret;
666
667 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
668
669 if (ret != 0)
670 report = "unknown";
671 else if (bypass)
672 report = "enabled";
673 else
674 report = "disabled";
675
676 return sprintf(buf, "%s\n", report);
677}
678static DEVICE_ATTR(bypass, 0444,
679 regulator_bypass_show, NULL);
bc558a60 680
414c70cb
LG		 681/* Calculate the new optimum regulator operating mode based on the new total
682 * consumer load. All locks held by caller */
8460ef38 683static int drms_uA_update(struct regulator_dev *rdev)
414c70cb
LG		 684{
685 struct regulator *sibling;
686 int current_uA = 0, output_uV, input_uV, err;
687 unsigned int mode;
688
70cfef26
KK		 689 lockdep_assert_held_once(&rdev->mutex);
690
8460ef38
BA		 691 /*
692 * first check to see if we can set modes at all, otherwise just
693 * tell the consumer everything is OK.
694 */
414c70cb 695 err = regulator_check_drms(rdev);
8460ef38
BA		 696 if (err < 0)
697 return 0;
698
8f4490e0
BA		 699 if (!rdev->desc->ops->get_optimum_mode &&
700 !rdev->desc->ops->set_load)
8460ef38
BA		 701 return 0;
702
8f4490e0
BA		 703 if (!rdev->desc->ops->set_mode &&
704 !rdev->desc->ops->set_load)
8460ef38 705 return -EINVAL;
414c70cb
LG		 706
707 /* get output voltage */
1bf5a1f8 708 output_uV = _regulator_get_voltage(rdev);
8460ef38
BA		 709 if (output_uV <= 0) {
710 rdev_err(rdev, "invalid output voltage found\n");
711 return -EINVAL;
712 }
414c70cb
LG		 713
714 /* get input voltage */
1bf5a1f8
MB		 715 input_uV = 0;
716 if (rdev->supply)
3f24f5ad 717 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 718 if (input_uV <= 0)
414c70cb 719 input_uV = rdev->constraints->input_uV;
8460ef38
BA		 720 if (input_uV <= 0) {
721 rdev_err(rdev, "invalid input voltage found\n");
722 return -EINVAL;
723 }
414c70cb
LG		 724
725 /* calc total requested load */
726 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 727 current_uA += sibling->uA_load;
414c70cb 728
22a10bca
SB		 729 current_uA += rdev->constraints->system_load;
730
8f4490e0
BA		 731 if (rdev->desc->ops->set_load) {
732 /* set the optimum mode for our new total regulator load */
733 err = rdev->desc->ops->set_load(rdev, current_uA);
734 if (err < 0)
735 rdev_err(rdev, "failed to set load %d\n", current_uA);
736 } else {
737 /* now get the optimum mode for our new total regulator load */
738 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
739 output_uV, current_uA);
740
741 /* check the new mode is allowed */
742 err = regulator_mode_constrain(rdev, &mode);
743 if (err < 0) {
744 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
745 current_uA, input_uV, output_uV);
746 return err;
747 }
414c70cb 748
8f4490e0
BA		 749 err = rdev->desc->ops->set_mode(rdev, mode);
750 if (err < 0)
751 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
8460ef38
BA		 752 }
753
8460ef38 754 return err;
414c70cb
LG		 755}
756
757static int suspend_set_state(struct regulator_dev *rdev,
758 struct regulator_state *rstate)
759{
760 int ret = 0;
638f85c5
MB		 761
762 /* If we have no suspend mode configration don't set anything;
8ac0e95d
AL		 763 * only warn if the driver implements set_suspend_voltage or
764 * set_suspend_mode callback.
638f85c5
MB		 765 */
766 if (!rstate->enabled && !rstate->disabled) {
8ac0e95d
AL		 767 if (rdev->desc->ops->set_suspend_voltage ||
768 rdev->desc->ops->set_suspend_mode)
5da84fd9 769 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 770 return 0;
771 }
772
773 if (rstate->enabled && rstate->disabled) {
5da84fd9 774 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 775 return -EINVAL;
776 }
414c70cb 777
8ac0e95d 778 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
414c70cb 779 ret = rdev->desc->ops->set_suspend_enable(rdev);
8ac0e95d 780 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
414c70cb 781 ret = rdev->desc->ops->set_suspend_disable(rdev);
8ac0e95d
AL		 782 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
783 ret = 0;
784
414c70cb 785 if (ret < 0) {
5da84fd9 786 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 787 return ret;
788 }
789
790 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
791 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
792 if (ret < 0) {
5da84fd9 793 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 794 return ret;
795 }
796 }
797
798 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
799 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
800 if (ret < 0) {
5da84fd9 801 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 802 return ret;
803 }
804 }
805 return ret;
806}
807
808/* locks held by caller */
809static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
810{
70cfef26
KK		 811 lockdep_assert_held_once(&rdev->mutex);
812
414c70cb
LG		 813 if (!rdev->constraints)
814 return -EINVAL;
815
816 switch (state) {
817 case PM_SUSPEND_STANDBY:
818 return suspend_set_state(rdev,
819 &rdev->constraints->state_standby);
820 case PM_SUSPEND_MEM:
821 return suspend_set_state(rdev,
822 &rdev->constraints->state_mem);
823 case PM_SUSPEND_MAX:
824 return suspend_set_state(rdev,
825 &rdev->constraints->state_disk);
826 default:
827 return -EINVAL;
828 }
829}
830
831static void print_constraints(struct regulator_dev *rdev)
832{
833 struct regulation_constraints *constraints = rdev->constraints;
a7068e39 834 char buf[160] = "";
5751a99f 835 size_t len = sizeof(buf) - 1;
8f031b48
MB		 836 int count = 0;
837 int ret;
414c70cb 838
8f031b48 839 if (constraints->min_uV && constraints->max_uV) {
414c70cb 840 if (constraints->min_uV == constraints->max_uV)
5751a99f
SW		 841 count += scnprintf(buf + count, len - count, "%d mV ",
842 constraints->min_uV / 1000);
414c70cb 843 else
5751a99f
SW		 844 count += scnprintf(buf + count, len - count,
845 "%d <--> %d mV ",
846 constraints->min_uV / 1000,
847 constraints->max_uV / 1000);
8f031b48
MB		 848 }
849
850 if (!constraints->min_uV ||
851 constraints->min_uV != constraints->max_uV) {
852 ret = _regulator_get_voltage(rdev);
853 if (ret > 0)
5751a99f
SW		 854 count += scnprintf(buf + count, len - count,
855 "at %d mV ", ret / 1000);
8f031b48
MB		 856 }
857
bf5892a8 858 if (constraints->uV_offset)
5751a99f
SW		 859 count += scnprintf(buf + count, len - count, "%dmV offset ",
860 constraints->uV_offset / 1000);
bf5892a8 861
8f031b48 862 if (constraints->min_uA && constraints->max_uA) {
414c70cb 863 if (constraints->min_uA == constraints->max_uA)
5751a99f
SW		 864 count += scnprintf(buf + count, len - count, "%d mA ",
865 constraints->min_uA / 1000);
414c70cb 866 else
5751a99f
SW		 867 count += scnprintf(buf + count, len - count,
868 "%d <--> %d mA ",
869 constraints->min_uA / 1000,
870 constraints->max_uA / 1000);
8f031b48
MB		 871 }
872
873 if (!constraints->min_uA ||
874 constraints->min_uA != constraints->max_uA) {
875 ret = _regulator_get_current_limit(rdev);
876 if (ret > 0)
5751a99f
SW		 877 count += scnprintf(buf + count, len - count,
878 "at %d mA ", ret / 1000);
414c70cb 879 }
8f031b48 880
414c70cb 881 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
5751a99f 882 count += scnprintf(buf + count, len - count, "fast ");
414c70cb 883 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
5751a99f 884 count += scnprintf(buf + count, len - count, "normal ");
414c70cb 885 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
5751a99f 886 count += scnprintf(buf + count, len - count, "idle ");
414c70cb 887 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
5751a99f 888 count += scnprintf(buf + count, len - count, "standby");
414c70cb 889
215b8b05 890 if (!count)
5751a99f 891 scnprintf(buf, len, "no parameters");
215b8b05 892
194dbaef 893 rdev_dbg(rdev, "%s\n", buf);
4a682922
MB		 894
895 if ((constraints->min_uV != constraints->max_uV) &&
896 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
897 rdev_warn(rdev,
898 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 899}
900
e79055d6 901static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 902 struct regulation_constraints *constraints)
a5766f11 903{
272e2315 904 const struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 905 int ret;
906
907 /* do we need to apply the constraint voltage */
908 if (rdev->constraints->apply_uV &&
75790251 909 rdev->constraints->min_uV == rdev->constraints->max_uV) {
064d5cd1
AB		 910 int current_uV = _regulator_get_voltage(rdev);
911 if (current_uV < 0) {
69d58839
NM		 912 rdev_err(rdev,
913 "failed to get the current voltage(%d)\n",
914 current_uV);
064d5cd1
AB		 915 return current_uV;
916 }
917 if (current_uV < rdev->constraints->min_uV ||
918 current_uV > rdev->constraints->max_uV) {
919 ret = _regulator_do_set_voltage(
920 rdev, rdev->constraints->min_uV,
921 rdev->constraints->max_uV);
922 if (ret < 0) {
923 rdev_err(rdev,
69d58839
NM		 924 "failed to apply %duV constraint(%d)\n",
925 rdev->constraints->min_uV, ret);
064d5cd1
AB		 926 return ret;
927 }
75790251 928 }
af5866c9 929 }
e06f5b4f 930
4367cfdc
DB		 931 /* constrain machine-level voltage specs to fit
932 * the actual range supported by this regulator.
933 */
934 if (ops->list_voltage && rdev->desc->n_voltages) {
935 int count = rdev->desc->n_voltages;
936 int i;
937 int min_uV = INT_MAX;
938 int max_uV = INT_MIN;
939 int cmin = constraints->min_uV;
940 int cmax = constraints->max_uV;
941
3e590918
MB		 942 /* it's safe to autoconfigure fixed-voltage supplies
943 and the constraints are used by list_voltage. */
4367cfdc 944 if (count == 1 && !cmin) {
3e590918 945 cmin = 1;
4367cfdc 946 cmax = INT_MAX;
3e590918
MB		 947 constraints->min_uV = cmin;
948 constraints->max_uV = cmax;
4367cfdc
DB		 949 }
950
3e2b9abd
MB		 951 /* voltage constraints are optional */
952 if ((cmin == 0) && (cmax == 0))
e79055d6 953 return 0;
3e2b9abd 954
4367cfdc 955 /* else require explicit machine-level constraints */
3e2b9abd 956 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 957 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 958 return -EINVAL;
4367cfdc
DB		 959 }
960
961 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
962 for (i = 0; i < count; i++) {
963 int value;
964
965 value = ops->list_voltage(rdev, i);
966 if (value <= 0)
967 continue;
968
969 /* maybe adjust [min_uV..max_uV] */
970 if (value >= cmin && value < min_uV)
971 min_uV = value;
972 if (value <= cmax && value > max_uV)
973 max_uV = value;
974 }
975
976 /* final: [min_uV..max_uV] valid iff constraints valid */
977 if (max_uV < min_uV) {
fff15bef
MB		 978 rdev_err(rdev,
979 "unsupportable voltage constraints %u-%uuV\n",
980 min_uV, max_uV);
e79055d6 981 return -EINVAL;
4367cfdc
DB		 982 }
983
984 /* use regulator's subset of machine constraints */
985 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 986 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
987 constraints->min_uV, min_uV);
4367cfdc
DB		 988 constraints->min_uV = min_uV;
989 }
990 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 991 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
992 constraints->max_uV, max_uV);
4367cfdc
DB		 993 constraints->max_uV = max_uV;
994 }
995 }
996
e79055d6
MB		 997 return 0;
998}
999
f8c1700d
LD		 1000static int machine_constraints_current(struct regulator_dev *rdev,
1001 struct regulation_constraints *constraints)
1002{
272e2315 1003 const struct regulator_ops *ops = rdev->desc->ops;
f8c1700d
LD		 1004 int ret;
1005
1006 if (!constraints->min_uA && !constraints->max_uA)
1007 return 0;
1008
1009 if (constraints->min_uA > constraints->max_uA) {
1010 rdev_err(rdev, "Invalid current constraints\n");
1011 return -EINVAL;
1012 }
1013
1014 if (!ops->set_current_limit || !ops->get_current_limit) {
1015 rdev_warn(rdev, "Operation of current configuration missing\n");
1016 return 0;
1017 }
1018
1019 /* Set regulator current in constraints range */
1020 ret = ops->set_current_limit(rdev, constraints->min_uA,
1021 constraints->max_uA);
1022 if (ret < 0) {
1023 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1024 return ret;
1025 }
1026
1027 return 0;
1028}
1029
30c21971
MP		 1030static int _regulator_do_enable(struct regulator_dev *rdev);
1031
e79055d6
MB		 1032/**
1033 * set_machine_constraints - sets regulator constraints
1034 * @rdev: regulator source
1035 * @constraints: constraints to apply
1036 *
1037 * Allows platform initialisation code to define and constrain
1038 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1039 * Constraints *must* be set by platform code in order for some
1040 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1041 * set_mode.
1042 */
1043static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 1044 const struct regulation_constraints *constraints)
e79055d6
MB		 1045{
1046 int ret = 0;
272e2315 1047 const struct regulator_ops *ops = rdev->desc->ops;
e79055d6 1048
9a8f5e07
MB		 1049 if (constraints)
1050 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1051 GFP_KERNEL);
1052 else
1053 rdev->constraints = kzalloc(sizeof(*constraints),
1054 GFP_KERNEL);
f8c12fe3
MB		 1055 if (!rdev->constraints)
1056 return -ENOMEM;
af5866c9 1057
f8c12fe3 1058 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6 1059 if (ret != 0)
6333ef46 1060 return ret;
e79055d6 1061
f8c1700d 1062 ret = machine_constraints_current(rdev, rdev->constraints);
e79055d6 1063 if (ret != 0)
6333ef46 1064 return ret;
e79055d6 1065
36e4f839
SB		 1066 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1067 ret = ops->set_input_current_limit(rdev,
1068 rdev->constraints->ilim_uA);
1069 if (ret < 0) {
1070 rdev_err(rdev, "failed to set input limit\n");
6333ef46 1071 return ret;
36e4f839
SB		 1072 }
1073 }
1074
a5766f11 1075 /* do we need to setup our suspend state */
9a8f5e07 1076 if (rdev->constraints->initial_state) {
f8c12fe3 1077 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 1078 if (ret < 0) {
5da84fd9 1079 rdev_err(rdev, "failed to set suspend state\n");
6333ef46 1080 return ret;
e06f5b4f
MB		 1081 }
1082 }
a5766f11 1083
9a8f5e07 1084 if (rdev->constraints->initial_mode) {
a308466c 1085 if (!ops->set_mode) {
5da84fd9 1086 rdev_err(rdev, "no set_mode operation\n");
6333ef46 1087 return -EINVAL;
a308466c
MB		 1088 }
1089
f8c12fe3 1090 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 1091 if (ret < 0) {
5da84fd9 1092 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
6333ef46 1093 return ret;
a308466c
MB		 1094 }
1095 }
1096
cacf90f2
MB		 1097 /* If the constraints say the regulator should be on at this point
1098 * and we have control then make sure it is enabled.
1099 */
30c21971
MP		 1100 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1101 ret = _regulator_do_enable(rdev);
1102 if (ret < 0 && ret != -EINVAL) {
5da84fd9 1103 rdev_err(rdev, "failed to enable\n");
6333ef46 1104 return ret;
e5fda26c
MB		 1105 }
1106 }
1107
1653ccf4
YSB		 1108 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1109 && ops->set_ramp_delay) {
6f0b2c69
YSB		 1110 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1111 if (ret < 0) {
1112 rdev_err(rdev, "failed to set ramp_delay\n");
6333ef46 1113 return ret;
6f0b2c69
YSB		 1114 }
1115 }
1116
23c779b9
SB		 1117 if (rdev->constraints->pull_down && ops->set_pull_down) {
1118 ret = ops->set_pull_down(rdev);
1119 if (ret < 0) {
1120 rdev_err(rdev, "failed to set pull down\n");
6333ef46 1121 return ret;
23c779b9
SB		 1122 }
1123 }
1124
57f66b78
SB		 1125 if (rdev->constraints->soft_start && ops->set_soft_start) {
1126 ret = ops->set_soft_start(rdev);
1127 if (ret < 0) {
1128 rdev_err(rdev, "failed to set soft start\n");
6333ef46 1129 return ret;
57f66b78
SB		 1130 }
1131 }
1132
3a003bae
SB		 1133 if (rdev->constraints->over_current_protection
1134 && ops->set_over_current_protection) {
1135 ret = ops->set_over_current_protection(rdev);
1136 if (ret < 0) {
1137 rdev_err(rdev, "failed to set over current protection\n");
6333ef46 1138 return ret;
3a003bae
SB		 1139 }
1140 }
1141
670666b9
LD		 1142 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1143 bool ad_state = (rdev->constraints->active_discharge ==
1144 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1145
1146 ret = ops->set_active_discharge(rdev, ad_state);
1147 if (ret < 0) {
1148 rdev_err(rdev, "failed to set active discharge\n");
1149 return ret;
1150 }
1151 }
1152
909f7ee0
LD		 1153 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1154 bool ad_state = (rdev->constraints->active_discharge ==
1155 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1156
1157 ret = ops->set_active_discharge(rdev, ad_state);
1158 if (ret < 0) {
1159 rdev_err(rdev, "failed to set active discharge\n");
1160 return ret;
3a003bae
SB		 1161 }
1162 }
1163
a5766f11 1164 print_constraints(rdev);
1a6958e7 1165 return 0;
a5766f11
LG		 1166}
1167
1168/**
1169 * set_supply - set regulator supply regulator
69279fb9
MB		 1170 * @rdev: regulator name
1171 * @supply_rdev: supply regulator name
a5766f11
LG		 1172 *
1173 * Called by platform initialisation code to set the supply regulator for this
1174 * regulator. This ensures that a regulators supply will also be enabled by the
1175 * core if it's child is enabled.
1176 */
1177static int set_supply(struct regulator_dev *rdev,
3801b86a 1178 struct regulator_dev *supply_rdev)
a5766f11
LG		 1179{
1180 int err;
1181
3801b86a
MB		 1182 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1183
e2c09ae7
JMC		 1184 if (!try_module_get(supply_rdev->owner))
1185 return -ENODEV;
1186
3801b86a 1187 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 1188 if (rdev->supply == NULL) {
1189 err = -ENOMEM;
3801b86a 1190 return err;
a5766f11 1191 }
57ad526a 1192 supply_rdev->open_count++;
3801b86a
MB		 1193
1194 return 0;
a5766f11
LG		 1195}
1196
1197/**
06c63f93 1198 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 1199 * @rdev: regulator source
40f9244f 1200 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 1201 * @supply: symbolic name for supply
a5766f11
LG		 1202 *
1203 * Allows platform initialisation code to map physical regulator
1204 * sources to symbolic names for supplies for use by devices. Devices
1205 * should use these symbolic names to request regulators, avoiding the
1206 * need to provide board-specific regulator names as platform data.
1207 */
1208static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 1209 const char *consumer_dev_name,
1210 const char *supply)
a5766f11
LG		 1211{
1212 struct regulator_map *node;
9ed2099e 1213 int has_dev;
a5766f11
LG		 1214
1215 if (supply == NULL)
1216 return -EINVAL;
1217
9ed2099e
MB		 1218 if (consumer_dev_name != NULL)
1219 has_dev = 1;
1220 else
1221 has_dev = 0;
1222
6001e13c 1223 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1224 if (node->dev_name && consumer_dev_name) {
1225 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1226 continue;
1227 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1228 continue;
23b5cc2a
JN		 1229 }
1230
6001e13c
DB		 1231 if (strcmp(node->supply, supply) != 0)
1232 continue;
1233
737f360d
MB		 1234 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1235 consumer_dev_name,
1236 dev_name(&node->regulator->dev),
1237 node->regulator->desc->name,
1238 supply,
1239 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 1240 return -EBUSY;
1241 }
1242
9ed2099e 1243 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 1244 if (node == NULL)
1245 return -ENOMEM;
1246
1247 node->regulator = rdev;
a5766f11
LG		 1248 node->supply = supply;
1249
9ed2099e
MB		 1250 if (has_dev) {
1251 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1252 if (node->dev_name == NULL) {
1253 kfree(node);
1254 return -ENOMEM;
1255 }
40f9244f
MB		 1256 }
1257
a5766f11
LG		 1258 list_add(&node->list, &regulator_map_list);
1259 return 0;
1260}
1261
0f1d747b
MR		 1262static void unset_regulator_supplies(struct regulator_dev *rdev)
1263{
1264 struct regulator_map *node, *n;
1265
1266 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1267 if (rdev == node->regulator) {
1268 list_del(&node->list);
40f9244f 1269 kfree(node->dev_name);
0f1d747b 1270 kfree(node);
0f1d747b
MR		 1271 }
1272 }
1273}
1274
f5726ae3 1275#define REG_STR_SIZE 64
414c70cb
LG		 1276
1277static struct regulator *create_regulator(struct regulator_dev *rdev,
1278 struct device *dev,
1279 const char *supply_name)
1280{
1281 struct regulator *regulator;
1282 char buf[REG_STR_SIZE];
1283 int err, size;
1284
1285 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1286 if (regulator == NULL)
1287 return NULL;
1288
1289 mutex_lock(&rdev->mutex);
1290 regulator->rdev = rdev;
1291 list_add(&regulator->list, &rdev->consumer_list);
1292
1293 if (dev) {
e2c98eaf
SG		 1294 regulator->dev = dev;
1295
222cc7b1 1296 /* Add a link to the device sysfs entry */
414c70cb
LG		 1297 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1298 dev->kobj.name, supply_name);
1299 if (size >= REG_STR_SIZE)
222cc7b1 1300 goto overflow_err;
414c70cb
LG		 1301
1302 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1303 if (regulator->supply_name == NULL)
222cc7b1 1304 goto overflow_err;
414c70cb 1305
ff268b56 1306 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
414c70cb
LG		 1307 buf);
1308 if (err) {
ff268b56 1309 rdev_dbg(rdev, "could not add device link %s err %d\n",
5da84fd9 1310 dev->kobj.name, err);
222cc7b1 1311 /* non-fatal */
414c70cb 1312 }
5de70519
MB		 1313 } else {
1314 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1315 if (regulator->supply_name == NULL)
222cc7b1 1316 goto overflow_err;
5de70519
MB		 1317 }
1318
5de70519
MB		 1319 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1320 rdev->debugfs);
24751434 1321 if (!regulator->debugfs) {
ad3a942b 1322 rdev_dbg(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1323 } else {
1324 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1325 &regulator->uA_load);
1326 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1327 &regulator->min_uV);
1328 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1329 &regulator->max_uV);
414c70cb 1330 }
5de70519 1331
6492bc1b
MB		 1332 /*
1333 * Check now if the regulator is an always on regulator - if
1334 * it is then we don't need to do nearly so much work for
1335 * enable/disable calls.
1336 */
1337 if (!_regulator_can_change_status(rdev) &&
1338 _regulator_is_enabled(rdev))
1339 regulator->always_on = true;
1340
414c70cb
LG		 1341 mutex_unlock(&rdev->mutex);
1342 return regulator;
414c70cb
LG		 1343overflow_err:
1344 list_del(&regulator->list);
1345 kfree(regulator);
1346 mutex_unlock(&rdev->mutex);
1347 return NULL;
1348}
1349
31aae2be
MB		 1350static int _regulator_get_enable_time(struct regulator_dev *rdev)
1351{
00c877c6
LD		 1352 if (rdev->constraints && rdev->constraints->enable_time)
1353 return rdev->constraints->enable_time;
31aae2be 1354 if (!rdev->desc->ops->enable_time)
79511ed3 1355 return rdev->desc->enable_time;
31aae2be
MB		 1356 return rdev->desc->ops->enable_time(rdev);
1357}
1358
a06ccd9c
CK		 1359static struct regulator_supply_alias *regulator_find_supply_alias(
1360 struct device *dev, const char *supply)
1361{
1362 struct regulator_supply_alias *map;
1363
1364 list_for_each_entry(map, &regulator_supply_alias_list, list)
1365 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1366 return map;
1367
1368 return NULL;
1369}
1370
1371static void regulator_supply_alias(struct device **dev, const char **supply)
1372{
1373 struct regulator_supply_alias *map;
1374
1375 map = regulator_find_supply_alias(*dev, *supply);
1376 if (map) {
1377 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1378 *supply, map->alias_supply,
1379 dev_name(map->alias_dev));
1380 *dev = map->alias_dev;
1381 *supply = map->alias_supply;
1382 }
1383}
1384
85f3b431
TV		 1385static int of_node_match(struct device *dev, const void *data)
1386{
1387 return dev->of_node == data;
1388}
1389
1390static struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
1391{
1392 struct device *dev;
1393
1394 dev = class_find_device(&regulator_class, NULL, np, of_node_match);
1395
1396 return dev ? dev_to_rdev(dev) : NULL;
1397}
1398
1399static int regulator_match(struct device *dev, const void *data)
1400{
1401 struct regulator_dev *r = dev_to_rdev(dev);
1402
1403 return strcmp(rdev_get_name(r), data) == 0;
1404}
1405
1406static struct regulator_dev *regulator_lookup_by_name(const char *name)
1407{
1408 struct device *dev;
1409
1410 dev = class_find_device(&regulator_class, NULL, name, regulator_match);
1411
1412 return dev ? dev_to_rdev(dev) : NULL;
1413}
1414
1415/**
1416 * regulator_dev_lookup - lookup a regulator device.
1417 * @dev: device for regulator "consumer".
1418 * @supply: Supply name or regulator ID.
1419 * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if
1420 * lookup could succeed in the future.
1421 *
1422 * If successful, returns a struct regulator_dev that corresponds to the name
1423 * @supply and with the embedded struct device refcount incremented by one,
1424 * or NULL on failure. The refcount must be dropped by calling put_device().
1425 */
69511a45 1426static struct regulator_dev *regulator_dev_lookup(struct device *dev,
6d191a5f
MB		 1427 const char *supply,
1428 int *ret)
69511a45
RN		 1429{
1430 struct regulator_dev *r;
1431 struct device_node *node;
576ca436
MB		 1432 struct regulator_map *map;
1433 const char *devname = NULL;
69511a45 1434
a06ccd9c
CK		 1435 regulator_supply_alias(&dev, &supply);
1436
69511a45
RN		 1437 /* first do a dt based lookup */
1438 if (dev && dev->of_node) {
1439 node = of_get_regulator(dev, supply);
6d191a5f 1440 if (node) {
85f3b431
TV		 1441 r = of_find_regulator_by_node(node);
1442 if (r)
1443 return r;
317b5684
MB		 1444 *ret = -EPROBE_DEFER;
1445 return NULL;
6d191a5f
MB		 1446 } else {
1447 /*
1448 * If we couldn't even get the node then it's
1449 * not just that the device didn't register
1450 * yet, there's no node and we'll never
1451 * succeed.
1452 */
1453 *ret = -ENODEV;
1454 }
69511a45
RN		 1455 }
1456
1457 /* if not found, try doing it non-dt way */
576ca436
MB		 1458 if (dev)
1459 devname = dev_name(dev);
1460
85f3b431
TV		 1461 r = regulator_lookup_by_name(supply);
1462 if (r)
1463 return r;
69511a45 1464
85f3b431 1465 mutex_lock(&regulator_list_mutex);
576ca436
MB		 1466 list_for_each_entry(map, &regulator_map_list, list) {
1467 /* If the mapping has a device set up it must match */
1468 if (map->dev_name &&
1469 (!devname || strcmp(map->dev_name, devname)))
1470 continue;
1471
85f3b431
TV		 1472 if (strcmp(map->supply, supply) == 0 &&
1473 get_device(&map->regulator->dev)) {
1474 mutex_unlock(&regulator_list_mutex);
576ca436 1475 return map->regulator;
85f3b431 1476 }
576ca436 1477 }
85f3b431 1478 mutex_unlock(&regulator_list_mutex);
576ca436 1479
69511a45
RN		 1480 return NULL;
1481}
1482
6261b06d
BA		 1483static int regulator_resolve_supply(struct regulator_dev *rdev)
1484{
1485 struct regulator_dev *r;
1486 struct device *dev = rdev->dev.parent;
1487 int ret;
1488
1489 /* No supply to resovle? */
1490 if (!rdev->supply_name)
1491 return 0;
1492
1493 /* Supply already resolved? */
1494 if (rdev->supply)
1495 return 0;
1496
1497 r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
6261b06d 1498 if (!r) {
23c3f310
CK		 1499 if (ret == -ENODEV) {
1500 /*
1501 * No supply was specified for this regulator and
1502 * there will never be one.
1503 */
1504 return 0;
1505 }
1506
06423121
MB		 1507 /* Did the lookup explicitly defer for us? */
1508 if (ret == -EPROBE_DEFER)
1509 return ret;
1510
9f7e25ed
MB		 1511 if (have_full_constraints()) {
1512 r = dummy_regulator_rdev;
85f3b431 1513 get_device(&r->dev);
9f7e25ed
MB		 1514 } else {
1515 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1516 rdev->supply_name, rdev->desc->name);
1517 return -EPROBE_DEFER;
1518 }
6261b06d
BA		 1519 }
1520
1521 /* Recursively resolve the supply of the supply */
1522 ret = regulator_resolve_supply(r);
85f3b431
TV		 1523 if (ret < 0) {
1524 put_device(&r->dev);
6261b06d 1525 return ret;
85f3b431 1526 }
6261b06d
BA		 1527
1528 ret = set_supply(rdev, r);
85f3b431
TV		 1529 if (ret < 0) {
1530 put_device(&r->dev);
6261b06d 1531 return ret;
85f3b431 1532 }
6261b06d
BA		 1533
1534 /* Cascade always-on state to supply */
9f8df6ad 1535 if (_regulator_is_enabled(rdev) && rdev->supply) {
6261b06d 1536 ret = regulator_enable(rdev->supply);
36a1f1b6 1537 if (ret < 0) {
9f8df6ad 1538 _regulator_put(rdev->supply);
8e5356a7 1539 rdev->supply = NULL;
6261b06d 1540 return ret;
36a1f1b6 1541 }
6261b06d
BA		 1542 }
1543
1544 return 0;
1545}
1546
5ffbd136
MB		 1547/* Internal regulator request function */
1548static struct regulator *_regulator_get(struct device *dev, const char *id,
4ddfebd3 1549 bool exclusive, bool allow_dummy)
414c70cb
LG		 1550{
1551 struct regulator_dev *rdev;
04bf3011 1552 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
40f9244f 1553 const char *devname = NULL;
317b5684 1554 int ret;
414c70cb
LG		 1555
1556 if (id == NULL) {
5da84fd9 1557 pr_err("get() with no identifier\n");
043c998f 1558 return ERR_PTR(-EINVAL);
414c70cb
LG		 1559 }
1560
40f9244f
MB		 1561 if (dev)
1562 devname = dev_name(dev);
1563
317b5684
MB		 1564 if (have_full_constraints())
1565 ret = -ENODEV;
1566 else
1567 ret = -EPROBE_DEFER;
1568
6d191a5f 1569 rdev = regulator_dev_lookup(dev, id, &ret);
69511a45
RN		 1570 if (rdev)
1571 goto found;
1572
ef60abbb
MB		 1573 regulator = ERR_PTR(ret);
1574
1e4b545c
NM		 1575 /*
1576 * If we have return value from dev_lookup fail, we do not expect to
1577 * succeed, so, quit with appropriate error value
1578 */
0d25d09d 1579 if (ret && ret != -ENODEV)
85f3b431 1580 return regulator;
1e4b545c 1581
34abbd68
MB		 1582 if (!devname)
1583 devname = "deviceless";
1584
4ddfebd3
MB		 1585 /*
1586 * Assume that a regulator is physically present and enabled
1587 * even if it isn't hooked up and just provide a dummy.
34abbd68 1588 */
87b28417 1589 if (have_full_constraints() && allow_dummy) {
5da84fd9
JP		 1590 pr_warn("%s supply %s not found, using dummy regulator\n",
1591 devname, id);
4ddfebd3 1592
34abbd68 1593 rdev = dummy_regulator_rdev;
85f3b431 1594 get_device(&rdev->dev);
34abbd68 1595 goto found;
0781719b
HG		 1596 /* Don't log an error when called from regulator_get_optional() */
1597 } else if (!have_full_constraints() || exclusive) {
acc3d5ce 1598 dev_warn(dev, "dummy supplies not allowed\n");
34abbd68 1599 }
34abbd68 1600
414c70cb
LG		 1601 return regulator;
1602
1603found:
5ffbd136
MB		 1604 if (rdev->exclusive) {
1605 regulator = ERR_PTR(-EPERM);
85f3b431
TV		 1606 put_device(&rdev->dev);
1607 return regulator;
5ffbd136
MB		 1608 }
1609
1610 if (exclusive && rdev->open_count) {
1611 regulator = ERR_PTR(-EBUSY);
85f3b431
TV		 1612 put_device(&rdev->dev);
1613 return regulator;
5ffbd136
MB		 1614 }
1615
6261b06d
BA		 1616 ret = regulator_resolve_supply(rdev);
1617 if (ret < 0) {
1618 regulator = ERR_PTR(ret);
85f3b431
TV		 1619 put_device(&rdev->dev);
1620 return regulator;
6261b06d
BA		 1621 }
1622
85f3b431
TV		 1623 if (!try_module_get(rdev->owner)) {
1624 put_device(&rdev->dev);
1625 return regulator;
1626 }
a5766f11 1627
414c70cb
LG		 1628 regulator = create_regulator(rdev, dev, id);
1629 if (regulator == NULL) {
1630 regulator = ERR_PTR(-ENOMEM);
85f3b431 1631 put_device(&rdev->dev);
414c70cb 1632 module_put(rdev->owner);
85f3b431 1633 return regulator;
414c70cb
LG		 1634 }
1635
5ffbd136
MB		 1636 rdev->open_count++;
1637 if (exclusive) {
1638 rdev->exclusive = 1;
1639
1640 ret = _regulator_is_enabled(rdev);
1641 if (ret > 0)
1642 rdev->use_count = 1;
1643 else
1644 rdev->use_count = 0;
1645 }
1646
414c70cb
LG		 1647 return regulator;
1648}
5ffbd136
MB		 1649
1650/**
1651 * regulator_get - lookup and obtain a reference to a regulator.
1652 * @dev: device for regulator "consumer"
1653 * @id: Supply name or regulator ID.
1654 *
1655 * Returns a struct regulator corresponding to the regulator producer,
1656 * or IS_ERR() condition containing errno.
1657 *
1658 * Use of supply names configured via regulator_set_device_supply() is
1659 * strongly encouraged. It is recommended that the supply name used
1660 * should match the name used for the supply and/or the relevant
1661 * device pins in the datasheet.
1662 */
1663struct regulator *regulator_get(struct device *dev, const char *id)
1664{
4ddfebd3 1665 return _regulator_get(dev, id, false, true);
5ffbd136 1666}
414c70cb
LG		 1667EXPORT_SYMBOL_GPL(regulator_get);
1668
5ffbd136
MB		 1669/**
1670 * regulator_get_exclusive - obtain exclusive access to a regulator.
1671 * @dev: device for regulator "consumer"
1672 * @id: Supply name or regulator ID.
1673 *
1674 * Returns a struct regulator corresponding to the regulator producer,
1675 * or IS_ERR() condition containing errno. Other consumers will be
69c3f723
SB		 1676 * unable to obtain this regulator while this reference is held and the
1677 * use count for the regulator will be initialised to reflect the current
1678 * state of the regulator.
5ffbd136
MB		 1679 *
1680 * This is intended for use by consumers which cannot tolerate shared
1681 * use of the regulator such as those which need to force the
1682 * regulator off for correct operation of the hardware they are
1683 * controlling.
1684 *
1685 * Use of supply names configured via regulator_set_device_supply() is
1686 * strongly encouraged. It is recommended that the supply name used
1687 * should match the name used for the supply and/or the relevant
1688 * device pins in the datasheet.
1689 */
1690struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1691{
4ddfebd3 1692 return _regulator_get(dev, id, true, false);
5ffbd136
MB		 1693}
1694EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1695
de1dd9fd
MB		 1696/**
1697 * regulator_get_optional - obtain optional access to a regulator.
1698 * @dev: device for regulator "consumer"
1699 * @id: Supply name or regulator ID.
1700 *
1701 * Returns a struct regulator corresponding to the regulator producer,
69c3f723 1702 * or IS_ERR() condition containing errno.
de1dd9fd
MB		 1703 *
1704 * This is intended for use by consumers for devices which can have
1705 * some supplies unconnected in normal use, such as some MMC devices.
1706 * It can allow the regulator core to provide stub supplies for other
1707 * supplies requested using normal regulator_get() calls without
1708 * disrupting the operation of drivers that can handle absent
1709 * supplies.
1710 *
1711 * Use of supply names configured via regulator_set_device_supply() is
1712 * strongly encouraged. It is recommended that the supply name used
1713 * should match the name used for the supply and/or the relevant
1714 * device pins in the datasheet.
1715 */
1716struct regulator *regulator_get_optional(struct device *dev, const char *id)
1717{
4ddfebd3 1718 return _regulator_get(dev, id, false, false);
de1dd9fd
MB		 1719}
1720EXPORT_SYMBOL_GPL(regulator_get_optional);
1721
83b0302d 1722/* regulator_list_mutex lock held by regulator_put() */
23ff2f0f 1723static void _regulator_put(struct regulator *regulator)
414c70cb
LG		 1724{
1725 struct regulator_dev *rdev;
1726
93576842 1727 if (IS_ERR_OR_NULL(regulator))
414c70cb
LG		 1728 return;
1729
70cfef26
KK		 1730 lockdep_assert_held_once(&regulator_list_mutex);
1731
414c70cb
LG		 1732 rdev = regulator->rdev;
1733
5de70519 1734 debugfs_remove_recursive(regulator->debugfs);
5de70519 1735
414c70cb 1736 /* remove any sysfs entries */
e2c98eaf 1737 if (regulator->dev)
414c70cb 1738 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
83b0302d 1739 mutex_lock(&rdev->mutex);
414c70cb 1740 list_del(&regulator->list);
414c70cb 1741
5ffbd136
MB		 1742 rdev->open_count--;
1743 rdev->exclusive = 0;
85f3b431 1744 put_device(&rdev->dev);
83b0302d 1745 mutex_unlock(&rdev->mutex);
5ffbd136 1746
1768514e
MB		 1747 kfree(regulator->supply_name);
1748 kfree(regulator);
1749
414c70cb 1750 module_put(rdev->owner);
23ff2f0f
CK		 1751}
1752
1753/**
1754 * regulator_put - "free" the regulator source
1755 * @regulator: regulator source
1756 *
1757 * Note: drivers must ensure that all regulator_enable calls made on this
1758 * regulator source are balanced by regulator_disable calls prior to calling
1759 * this function.
1760 */
1761void regulator_put(struct regulator *regulator)
1762{
1763 mutex_lock(&regulator_list_mutex);
1764 _regulator_put(regulator);
414c70cb
LG		 1765 mutex_unlock(&regulator_list_mutex);
1766}
1767EXPORT_SYMBOL_GPL(regulator_put);
1768
a06ccd9c
CK		 1769/**
1770 * regulator_register_supply_alias - Provide device alias for supply lookup
1771 *
1772 * @dev: device that will be given as the regulator "consumer"
1773 * @id: Supply name or regulator ID
1774 * @alias_dev: device that should be used to lookup the supply
1775 * @alias_id: Supply name or regulator ID that should be used to lookup the
1776 * supply
1777 *
1778 * All lookups for id on dev will instead be conducted for alias_id on
1779 * alias_dev.
1780 */
1781int regulator_register_supply_alias(struct device *dev, const char *id,
1782 struct device *alias_dev,
1783 const char *alias_id)
1784{
1785 struct regulator_supply_alias *map;
1786
1787 map = regulator_find_supply_alias(dev, id);
1788 if (map)
1789 return -EEXIST;
1790
1791 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1792 if (!map)
1793 return -ENOMEM;
1794
1795 map->src_dev = dev;
1796 map->src_supply = id;
1797 map->alias_dev = alias_dev;
1798 map->alias_supply = alias_id;
1799
1800 list_add(&map->list, &regulator_supply_alias_list);
1801
1802 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1803 id, dev_name(dev), alias_id, dev_name(alias_dev));
1804
1805 return 0;
1806}
1807EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1808
1809/**
1810 * regulator_unregister_supply_alias - Remove device alias
1811 *
1812 * @dev: device that will be given as the regulator "consumer"
1813 * @id: Supply name or regulator ID
1814 *
1815 * Remove a lookup alias if one exists for id on dev.
1816 */
1817void regulator_unregister_supply_alias(struct device *dev, const char *id)
1818{
1819 struct regulator_supply_alias *map;
1820
1821 map = regulator_find_supply_alias(dev, id);
1822 if (map) {
1823 list_del(&map->list);
1824 kfree(map);
1825 }
1826}
1827EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1828
1829/**
1830 * regulator_bulk_register_supply_alias - register multiple aliases
1831 *
1832 * @dev: device that will be given as the regulator "consumer"
1833 * @id: List of supply names or regulator IDs
1834 * @alias_dev: device that should be used to lookup the supply
1835 * @alias_id: List of supply names or regulator IDs that should be used to
1836 * lookup the supply
1837 * @num_id: Number of aliases to register
1838 *
1839 * @return 0 on success, an errno on failure.
1840 *
1841 * This helper function allows drivers to register several supply
1842 * aliases in one operation. If any of the aliases cannot be
1843 * registered any aliases that were registered will be removed
1844 * before returning to the caller.
1845 */
9f8c0fe9
LJ		 1846int regulator_bulk_register_supply_alias(struct device *dev,
1847 const char *const *id,
a06ccd9c 1848 struct device *alias_dev,
9f8c0fe9 1849 const char *const *alias_id,
a06ccd9c
CK		 1850 int num_id)
1851{
1852 int i;
1853 int ret;
1854
1855 for (i = 0; i < num_id; ++i) {
1856 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1857 alias_id[i]);
1858 if (ret < 0)
1859 goto err;
1860 }
1861
1862 return 0;
1863
1864err:
1865 dev_err(dev,
1866 "Failed to create supply alias %s,%s -> %s,%s\n",
1867 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1868
1869 while (--i >= 0)
1870 regulator_unregister_supply_alias(dev, id[i]);
1871
1872 return ret;
1873}
1874EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1875
1876/**
1877 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1878 *
1879 * @dev: device that will be given as the regulator "consumer"
1880 * @id: List of supply names or regulator IDs
1881 * @num_id: Number of aliases to unregister
1882 *
1883 * This helper function allows drivers to unregister several supply
1884 * aliases in one operation.
1885 */
1886void regulator_bulk_unregister_supply_alias(struct device *dev,
9f8c0fe9 1887 const char *const *id,
a06ccd9c
CK		 1888 int num_id)
1889{
1890 int i;
1891
1892 for (i = 0; i < num_id; ++i)
1893 regulator_unregister_supply_alias(dev, id[i]);
1894}
1895EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1896
1897
f19b00da
KM		 1898/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1899static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1900 const struct regulator_config *config)
1901{
1902 struct regulator_enable_gpio *pin;
778b28b4 1903 struct gpio_desc *gpiod;
f19b00da
KM		 1904 int ret;
1905
778b28b4
RK		 1906 gpiod = gpio_to_desc(config->ena_gpio);
1907
f19b00da 1908 list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
778b28b4 1909 if (pin->gpiod == gpiod) {
f19b00da
KM		 1910 rdev_dbg(rdev, "GPIO %d is already used\n",
1911 config->ena_gpio);
1912 goto update_ena_gpio_to_rdev;
1913 }
1914 }
1915
1916 ret = gpio_request_one(config->ena_gpio,
1917 GPIOF_DIR_OUT | config->ena_gpio_flags,
1918 rdev_get_name(rdev));
1919 if (ret)
1920 return ret;
1921
1922 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1923 if (pin == NULL) {
1924 gpio_free(config->ena_gpio);
1925 return -ENOMEM;
1926 }
1927
778b28b4 1928 pin->gpiod = gpiod;
f19b00da
KM		 1929 pin->ena_gpio_invert = config->ena_gpio_invert;
1930 list_add(&pin->list, &regulator_ena_gpio_list);
1931
1932update_ena_gpio_to_rdev:
1933 pin->request_count++;
1934 rdev->ena_pin = pin;
1935 return 0;
1936}
1937
1938static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1939{
1940 struct regulator_enable_gpio *pin, *n;
1941
1942 if (!rdev->ena_pin)
1943 return;
1944
1945 /* Free the GPIO only in case of no use */
1946 list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
778b28b4 1947 if (pin->gpiod == rdev->ena_pin->gpiod) {
f19b00da
KM		 1948 if (pin->request_count <= 1) {
1949 pin->request_count = 0;
778b28b4 1950 gpiod_put(pin->gpiod);
f19b00da
KM		 1951 list_del(&pin->list);
1952 kfree(pin);
60a2362f
SWK		 1953 rdev->ena_pin = NULL;
1954 return;
f19b00da
KM		 1955 } else {
1956 pin->request_count--;
1957 }
1958 }
1959 }
1960}
1961
967cfb18 1962/**
31d6eebf
RD		 1963 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1964 * @rdev: regulator_dev structure
1965 * @enable: enable GPIO at initial use?
1966 *
967cfb18
KM		 1967 * GPIO is enabled in case of initial use. (enable_count is 0)
1968 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1969 */
1970static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1971{
1972 struct regulator_enable_gpio *pin = rdev->ena_pin;
1973
1974 if (!pin)
1975 return -EINVAL;
1976
1977 if (enable) {
1978 /* Enable GPIO at initial use */
1979 if (pin->enable_count == 0)
778b28b4
RK		 1980 gpiod_set_value_cansleep(pin->gpiod,
1981 !pin->ena_gpio_invert);
967cfb18
KM		 1982
1983 pin->enable_count++;
1984 } else {
1985 if (pin->enable_count > 1) {
1986 pin->enable_count--;
1987 return 0;
1988 }
1989
1990 /* Disable GPIO if not used */
1991 if (pin->enable_count <= 1) {
778b28b4
RK		 1992 gpiod_set_value_cansleep(pin->gpiod,
1993 pin->ena_gpio_invert);
967cfb18
KM		 1994 pin->enable_count = 0;
1995 }
1996 }
1997
1998 return 0;
1999}
2000
79fd1141
GX		 2001/**
2002 * _regulator_enable_delay - a delay helper function
2003 * @delay: time to delay in microseconds
2004 *
2005 * Delay for the requested amount of time as per the guidelines in:
2006 *
2007 * Documentation/timers/timers-howto.txt
2008 *
2009 * The assumption here is that regulators will never be enabled in
2010 * atomic context and therefore sleeping functions can be used.
2011 */
2012static void _regulator_enable_delay(unsigned int delay)
2013{
2014 unsigned int ms = delay / 1000;
2015 unsigned int us = delay % 1000;
2016
2017 if (ms > 0) {
2018 /*
2019 * For small enough values, handle super-millisecond
2020 * delays in the usleep_range() call below.
2021 */
2022 if (ms < 20)
2023 us += ms * 1000;
2024 else
2025 msleep(ms);
2026 }
2027
2028 /*
2029 * Give the scheduler some room to coalesce with any other
2030 * wakeup sources. For delays shorter than 10 us, don't even
2031 * bother setting up high-resolution timers and just busy-
2032 * loop.
2033 */
2034 if (us >= 10)
2035 usleep_range(us, us + 100);
2036 else
2037 udelay(us);
2038}
2039
5c5659d0
MB		 2040static int _regulator_do_enable(struct regulator_dev *rdev)
2041{
2042 int ret, delay;
2043
2044 /* Query before enabling in case configuration dependent. */
2045 ret = _regulator_get_enable_time(rdev);
2046 if (ret >= 0) {
2047 delay = ret;
2048 } else {
2049 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2050 delay = 0;
2051 }
2052
2053 trace_regulator_enable(rdev_get_name(rdev));
2054
871f5650
GX		 2055 if (rdev->desc->off_on_delay) {
2056 /* if needed, keep a distance of off_on_delay from last time
2057 * this regulator was disabled.
2058 */
2059 unsigned long start_jiffy = jiffies;
2060 unsigned long intended, max_delay, remaining;
2061
2062 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2063 intended = rdev->last_off_jiffy + max_delay;
2064
2065 if (time_before(start_jiffy, intended)) {
2066 /* calc remaining jiffies to deal with one-time
2067 * timer wrapping.
2068 * in case of multiple timer wrapping, either it can be
2069 * detected by out-of-range remaining, or it cannot be
2070 * detected and we gets a panelty of
2071 * _regulator_enable_delay().
2072 */
2073 remaining = intended - start_jiffy;
2074 if (remaining <= max_delay)
2075 _regulator_enable_delay(
2076 jiffies_to_usecs(remaining));
2077 }
2078 }
2079
967cfb18 2080 if (rdev->ena_pin) {
29d62ec5
DA		 2081 if (!rdev->ena_gpio_state) {
2082 ret = regulator_ena_gpio_ctrl(rdev, true);
2083 if (ret < 0)
2084 return ret;
2085 rdev->ena_gpio_state = 1;
2086 }
65f73508 2087 } else if (rdev->desc->ops->enable) {
5c5659d0
MB		 2088 ret = rdev->desc->ops->enable(rdev);
2089 if (ret < 0)
2090 return ret;
2091 } else {
2092 return -EINVAL;
2093 }
2094
2095 /* Allow the regulator to ramp; it would be useful to extend
2096 * this for bulk operations so that the regulators can ramp
2097 * together. */
2098 trace_regulator_enable_delay(rdev_get_name(rdev));
2099
79fd1141 2100 _regulator_enable_delay(delay);
5c5659d0
MB		 2101
2102 trace_regulator_enable_complete(rdev_get_name(rdev));
2103
2104 return 0;
2105}
2106
414c70cb
LG		 2107/* locks held by regulator_enable() */
2108static int _regulator_enable(struct regulator_dev *rdev)
2109{
5c5659d0 2110 int ret;
414c70cb 2111
70cfef26
KK		 2112 lockdep_assert_held_once(&rdev->mutex);
2113
414c70cb 2114 /* check voltage and requested load before enabling */
9a2372fa
MB		 2115 if (rdev->constraints &&
2116 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
2117 drms_uA_update(rdev);
414c70cb 2118
9a2372fa
MB		 2119 if (rdev->use_count == 0) {
2120 /* The regulator may on if it's not switchable or left on */
2121 ret = _regulator_is_enabled(rdev);
2122 if (ret == -EINVAL || ret == 0) {
2123 if (!_regulator_can_change_status(rdev))
2124 return -EPERM;
2125
5c5659d0 2126 ret = _regulator_do_enable(rdev);
31aae2be
MB		 2127 if (ret < 0)
2128 return ret;
2129
a7433cff 2130 } else if (ret < 0) {
5da84fd9 2131 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 2132 return ret;
2133 }
a7433cff 2134 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 2135 }
2136
9a2372fa
MB		 2137 rdev->use_count++;
2138
2139 return 0;
414c70cb
LG		 2140}
2141
2142/**
2143 * regulator_enable - enable regulator output
2144 * @regulator: regulator source
2145 *
cf7bbcdf
MB		 2146 * Request that the regulator be enabled with the regulator output at
2147 * the predefined voltage or current value. Calls to regulator_enable()
2148 * must be balanced with calls to regulator_disable().
2149 *
414c70cb 2150 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 2151 * hardwired in the regulator.
414c70cb
LG		 2152 */
2153int regulator_enable(struct regulator *regulator)
2154{
412aec61
DB		 2155 struct regulator_dev *rdev = regulator->rdev;
2156 int ret = 0;
414c70cb 2157
6492bc1b
MB		 2158 if (regulator->always_on)
2159 return 0;
2160
3801b86a
MB		 2161 if (rdev->supply) {
2162 ret = regulator_enable(rdev->supply);
2163 if (ret != 0)
2164 return ret;
2165 }
2166
412aec61 2167 mutex_lock(&rdev->mutex);
cd94b505 2168 ret = _regulator_enable(rdev);
412aec61 2169 mutex_unlock(&rdev->mutex);
3801b86a 2170
d1685e4e 2171 if (ret != 0 && rdev->supply)
3801b86a
MB		 2172 regulator_disable(rdev->supply);
2173
414c70cb
LG		 2174 return ret;
2175}
2176EXPORT_SYMBOL_GPL(regulator_enable);
2177
5c5659d0
MB		 2178static int _regulator_do_disable(struct regulator_dev *rdev)
2179{
2180 int ret;
2181
2182 trace_regulator_disable(rdev_get_name(rdev));
2183
967cfb18 2184 if (rdev->ena_pin) {
29d62ec5
DA		 2185 if (rdev->ena_gpio_state) {
2186 ret = regulator_ena_gpio_ctrl(rdev, false);
2187 if (ret < 0)
2188 return ret;
2189 rdev->ena_gpio_state = 0;
2190 }
5c5659d0
MB		 2191
2192 } else if (rdev->desc->ops->disable) {
2193 ret = rdev->desc->ops->disable(rdev);
2194 if (ret != 0)
2195 return ret;
2196 }
2197
871f5650
GX		 2198 /* cares about last_off_jiffy only if off_on_delay is required by
2199 * device.
2200 */
2201 if (rdev->desc->off_on_delay)
2202 rdev->last_off_jiffy = jiffies;
2203
5c5659d0
MB		 2204 trace_regulator_disable_complete(rdev_get_name(rdev));
2205
5c5659d0
MB		 2206 return 0;
2207}
2208
414c70cb 2209/* locks held by regulator_disable() */
3801b86a 2210static int _regulator_disable(struct regulator_dev *rdev)
414c70cb
LG		 2211{
2212 int ret = 0;
2213
70cfef26
KK		 2214 lockdep_assert_held_once(&rdev->mutex);
2215
cd94b505 2216 if (WARN(rdev->use_count <= 0,
43e7ee33 2217 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 2218 return -EIO;
2219
414c70cb 2220 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 2221 if (rdev->use_count == 1 &&
2222 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 2223
2224 /* we are last user */
5c5659d0 2225 if (_regulator_can_change_status(rdev)) {
a1c8a551
RF		 2226 ret = _notifier_call_chain(rdev,
2227 REGULATOR_EVENT_PRE_DISABLE,
2228 NULL);
2229 if (ret & NOTIFY_STOP_MASK)
2230 return -EINVAL;
2231
5c5659d0 2232 ret = _regulator_do_disable(rdev);
414c70cb 2233 if (ret < 0) {
5da84fd9 2234 rdev_err(rdev, "failed to disable\n");
a1c8a551
RF		 2235 _notifier_call_chain(rdev,
2236 REGULATOR_EVENT_ABORT_DISABLE,
2237 NULL);
414c70cb
LG		 2238 return ret;
2239 }
66fda75f
MP		 2240 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2241 NULL);
414c70cb
LG		 2242 }
2243
414c70cb
LG		 2244 rdev->use_count = 0;
2245 } else if (rdev->use_count > 1) {
2246
2247 if (rdev->constraints &&
2248 (rdev->constraints->valid_ops_mask &
2249 REGULATOR_CHANGE_DRMS))
2250 drms_uA_update(rdev);
2251
2252 rdev->use_count--;
2253 }
3801b86a 2254
414c70cb
LG		 2255 return ret;
2256}
2257
2258/**
2259 * regulator_disable - disable regulator output
2260 * @regulator: regulator source
2261 *
cf7bbcdf
MB		 2262 * Disable the regulator output voltage or current. Calls to
2263 * regulator_enable() must be balanced with calls to
2264 * regulator_disable().
69279fb9 2265 *
414c70cb 2266 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 2267 * devices have it enabled, the regulator device supports disabling and
2268 * machine constraints permit this operation.
414c70cb
LG		 2269 */
2270int regulator_disable(struct regulator *regulator)
2271{
412aec61
DB		 2272 struct regulator_dev *rdev = regulator->rdev;
2273 int ret = 0;
414c70cb 2274
6492bc1b
MB		 2275 if (regulator->always_on)
2276 return 0;
2277
412aec61 2278 mutex_lock(&rdev->mutex);
3801b86a 2279 ret = _regulator_disable(rdev);
412aec61 2280 mutex_unlock(&rdev->mutex);
8cbf811d 2281
3801b86a
MB		 2282 if (ret == 0 && rdev->supply)
2283 regulator_disable(rdev->supply);
8cbf811d 2284
414c70cb
LG		 2285 return ret;
2286}
2287EXPORT_SYMBOL_GPL(regulator_disable);
2288
2289/* locks held by regulator_force_disable() */
3801b86a 2290static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 2291{
2292 int ret = 0;
2293
70cfef26
KK		 2294 lockdep_assert_held_once(&rdev->mutex);
2295
a1c8a551
RF		 2296 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2297 REGULATOR_EVENT_PRE_DISABLE, NULL);
2298 if (ret & NOTIFY_STOP_MASK)
2299 return -EINVAL;
2300
66fda75f
MP		 2301 ret = _regulator_do_disable(rdev);
2302 if (ret < 0) {
2303 rdev_err(rdev, "failed to force disable\n");
a1c8a551
RF		 2304 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2305 REGULATOR_EVENT_ABORT_DISABLE, NULL);
66fda75f 2306 return ret;
414c70cb
LG		 2307 }
2308
66fda75f
MP		 2309 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2310 REGULATOR_EVENT_DISABLE, NULL);
2311
2312 return 0;
414c70cb
LG		 2313}
2314
2315/**
2316 * regulator_force_disable - force disable regulator output
2317 * @regulator: regulator source
2318 *
2319 * Forcibly disable the regulator output voltage or current.
2320 * NOTE: this *will* disable the regulator output even if other consumer
2321 * devices have it enabled. This should be used for situations when device
2322 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2323 */
2324int regulator_force_disable(struct regulator *regulator)
2325{
82d15839 2326 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 2327 int ret;
2328
82d15839 2329 mutex_lock(&rdev->mutex);
414c70cb 2330 regulator->uA_load = 0;
3801b86a 2331 ret = _regulator_force_disable(regulator->rdev);
82d15839 2332 mutex_unlock(&rdev->mutex);
8cbf811d 2333
3801b86a
MB		 2334 if (rdev->supply)
2335 while (rdev->open_count--)
2336 regulator_disable(rdev->supply);
8cbf811d 2337
414c70cb
LG		 2338 return ret;
2339}
2340EXPORT_SYMBOL_GPL(regulator_force_disable);
2341
da07ecd9
MB		 2342static void regulator_disable_work(struct work_struct *work)
2343{
2344 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2345 disable_work.work);
2346 int count, i, ret;
2347
2348 mutex_lock(&rdev->mutex);
2349
2350 BUG_ON(!rdev->deferred_disables);
2351
2352 count = rdev->deferred_disables;
2353 rdev->deferred_disables = 0;
2354
2355 for (i = 0; i < count; i++) {
2356 ret = _regulator_disable(rdev);
2357 if (ret != 0)
2358 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2359 }
2360
2361 mutex_unlock(&rdev->mutex);
2362
2363 if (rdev->supply) {
2364 for (i = 0; i < count; i++) {
2365 ret = regulator_disable(rdev->supply);
2366 if (ret != 0) {
2367 rdev_err(rdev,
2368 "Supply disable failed: %d\n", ret);
2369 }
2370 }
2371 }
2372}
2373
2374/**
2375 * regulator_disable_deferred - disable regulator output with delay
2376 * @regulator: regulator source
2377 * @ms: miliseconds until the regulator is disabled
2378 *
2379 * Execute regulator_disable() on the regulator after a delay. This
2380 * is intended for use with devices that require some time to quiesce.
2381 *
2382 * NOTE: this will only disable the regulator output if no other consumer
2383 * devices have it enabled, the regulator device supports disabling and
2384 * machine constraints permit this operation.
2385 */
2386int regulator_disable_deferred(struct regulator *regulator, int ms)
2387{
2388 struct regulator_dev *rdev = regulator->rdev;
2389
6492bc1b
MB		 2390 if (regulator->always_on)
2391 return 0;
2392
2b5a24a0
MB		 2393 if (!ms)
2394 return regulator_disable(regulator);
2395
da07ecd9
MB		 2396 mutex_lock(&rdev->mutex);
2397 rdev->deferred_disables++;
2398 mutex_unlock(&rdev->mutex);
2399
70dc6daf
DC		 2400 queue_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2401 msecs_to_jiffies(ms));
2402 return 0;
da07ecd9
MB		 2403}
2404EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2405
414c70cb
LG		 2406static int _regulator_is_enabled(struct regulator_dev *rdev)
2407{
65f73508 2408 /* A GPIO control always takes precedence */
7b74d149 2409 if (rdev->ena_pin)
65f73508
MB		 2410 return rdev->ena_gpio_state;
2411
9a7f6a4c 2412 /* If we don't know then assume that the regulator is always on */
9332546f 2413 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 2414 return 1;
414c70cb 2415
9332546f 2416 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 2417}
2418
3a40cfc3
SH		 2419static int _regulator_list_voltage(struct regulator *regulator,
2420 unsigned selector, int lock)
2421{
2422 struct regulator_dev *rdev = regulator->rdev;
2423 const struct regulator_ops *ops = rdev->desc->ops;
2424 int ret;
2425
2426 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2427 return rdev->desc->fixed_uV;
2428
2429 if (ops->list_voltage) {
2430 if (selector >= rdev->desc->n_voltages)
2431 return -EINVAL;
2432 if (lock)
2433 mutex_lock(&rdev->mutex);
2434 ret = ops->list_voltage(rdev, selector);
2435 if (lock)
2436 mutex_unlock(&rdev->mutex);
2437 } else if (rdev->supply) {
2438 ret = _regulator_list_voltage(rdev->supply, selector, lock);
2439 } else {
2440 return -EINVAL;
2441 }
2442
2443 if (ret > 0) {
2444 if (ret < rdev->constraints->min_uV)
2445 ret = 0;
2446 else if (ret > rdev->constraints->max_uV)
2447 ret = 0;
2448 }
2449
2450 return ret;
2451}
2452
414c70cb
LG		 2453/**
2454 * regulator_is_enabled - is the regulator output enabled
2455 * @regulator: regulator source
2456 *
412aec61
DB		 2457 * Returns positive if the regulator driver backing the source/client
2458 * has requested that the device be enabled, zero if it hasn't, else a
2459 * negative errno code.
2460 *
2461 * Note that the device backing this regulator handle can have multiple
2462 * users, so it might be enabled even if regulator_enable() was never
2463 * called for this particular source.
414c70cb
LG		 2464 */
2465int regulator_is_enabled(struct regulator *regulator)
2466{
9332546f
MB		 2467 int ret;
2468
6492bc1b
MB		 2469 if (regulator->always_on)
2470 return 1;
2471
9332546f
MB		 2472 mutex_lock(&regulator->rdev->mutex);
2473 ret = _regulator_is_enabled(regulator->rdev);
2474 mutex_unlock(&regulator->rdev->mutex);
2475
2476 return ret;
414c70cb
LG		 2477}
2478EXPORT_SYMBOL_GPL(regulator_is_enabled);
2479
d1e7de30
MS		 2480/**
2481 * regulator_can_change_voltage - check if regulator can change voltage
2482 * @regulator: regulator source
2483 *
2484 * Returns positive if the regulator driver backing the source/client
e227867f 2485 * can change its voltage, false otherwise. Useful for detecting fixed
d1e7de30
MS		 2486 * or dummy regulators and disabling voltage change logic in the client
2487 * driver.
2488 */
2489int regulator_can_change_voltage(struct regulator *regulator)
2490{
2491 struct regulator_dev *rdev = regulator->rdev;
2492
2493 if (rdev->constraints &&
19280e40
AL		 2494 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2495 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2496 return 1;
2497
2498 if (rdev->desc->continuous_voltage_range &&
2499 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2500 rdev->constraints->min_uV != rdev->constraints->max_uV)
2501 return 1;
2502 }
d1e7de30
MS		 2503
2504 return 0;
2505}
2506EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2507
4367cfdc
DB		 2508/**
2509 * regulator_count_voltages - count regulator_list_voltage() selectors
2510 * @regulator: regulator source
2511 *
2512 * Returns number of selectors, or negative errno. Selectors are
2513 * numbered starting at zero, and typically correspond to bitfields
2514 * in hardware registers.
2515 */
2516int regulator_count_voltages(struct regulator *regulator)
2517{
2518 struct regulator_dev *rdev = regulator->rdev;
2519
26988efe
JMC		 2520 if (rdev->desc->n_voltages)
2521 return rdev->desc->n_voltages;
2522
2523 if (!rdev->supply)
2524 return -EINVAL;
2525
2526 return regulator_count_voltages(rdev->supply);
4367cfdc
DB		 2527}
2528EXPORT_SYMBOL_GPL(regulator_count_voltages);
2529
2530/**
2531 * regulator_list_voltage - enumerate supported voltages
2532 * @regulator: regulator source
2533 * @selector: identify voltage to list
2534 * Context: can sleep
2535 *
2536 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 2537 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 2538 * negative errno.
2539 */
2540int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2541{
3a40cfc3 2542 return _regulator_list_voltage(regulator, selector, 1);
4367cfdc
DB		 2543}
2544EXPORT_SYMBOL_GPL(regulator_list_voltage);
2545
04eca28c
TT		 2546/**
2547 * regulator_get_regmap - get the regulator's register map
2548 * @regulator: regulator source
2549 *
2550 * Returns the register map for the given regulator, or an ERR_PTR value
2551 * if the regulator doesn't use regmap.
2552 */
2553struct regmap *regulator_get_regmap(struct regulator *regulator)
2554{
2555 struct regmap *map = regulator->rdev->regmap;
2556
2557 return map ? map : ERR_PTR(-EOPNOTSUPP);
2558}
2559
2560/**
2561 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2562 * @regulator: regulator source
2563 * @vsel_reg: voltage selector register, output parameter
2564 * @vsel_mask: mask for voltage selector bitfield, output parameter
2565 *
2566 * Returns the hardware register offset and bitmask used for setting the
2567 * regulator voltage. This might be useful when configuring voltage-scaling
2568 * hardware or firmware that can make I2C requests behind the kernel's back,
2569 * for example.
2570 *
2571 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2572 * and 0 is returned, otherwise a negative errno is returned.
2573 */
2574int regulator_get_hardware_vsel_register(struct regulator *regulator,
2575 unsigned *vsel_reg,
2576 unsigned *vsel_mask)
2577{
39f5460d
GX		 2578 struct regulator_dev *rdev = regulator->rdev;
2579 const struct regulator_ops *ops = rdev->desc->ops;
04eca28c
TT		 2580
2581 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2582 return -EOPNOTSUPP;
2583
2584 *vsel_reg = rdev->desc->vsel_reg;
2585 *vsel_mask = rdev->desc->vsel_mask;
2586
2587 return 0;
2588}
2589EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2590
2591/**
2592 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2593 * @regulator: regulator source
2594 * @selector: identify voltage to list
2595 *
2596 * Converts the selector to a hardware-specific voltage selector that can be
2597 * directly written to the regulator registers. The address of the voltage
2598 * register can be determined by calling @regulator_get_hardware_vsel_register.
2599 *
2600 * On error a negative errno is returned.
2601 */
2602int regulator_list_hardware_vsel(struct regulator *regulator,
2603 unsigned selector)
2604{
39f5460d
GX		 2605 struct regulator_dev *rdev = regulator->rdev;
2606 const struct regulator_ops *ops = rdev->desc->ops;
04eca28c
TT		 2607
2608 if (selector >= rdev->desc->n_voltages)
2609 return -EINVAL;
2610 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2611 return -EOPNOTSUPP;
2612
2613 return selector;
2614}
2615EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2616
2a668a8b
PW		 2617/**
2618 * regulator_get_linear_step - return the voltage step size between VSEL values
2619 * @regulator: regulator source
2620 *
2621 * Returns the voltage step size between VSEL values for linear
2622 * regulators, or return 0 if the regulator isn't a linear regulator.
2623 */
2624unsigned int regulator_get_linear_step(struct regulator *regulator)
2625{
2626 struct regulator_dev *rdev = regulator->rdev;
2627
2628 return rdev->desc->uV_step;
2629}
2630EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2631
a7a1ad90
MB		 2632/**
2633 * regulator_is_supported_voltage - check if a voltage range can be supported
2634 *
2635 * @regulator: Regulator to check.
2636 * @min_uV: Minimum required voltage in uV.
2637 * @max_uV: Maximum required voltage in uV.
2638 *
2639 * Returns a boolean or a negative error code.
2640 */
2641int regulator_is_supported_voltage(struct regulator *regulator,
2642 int min_uV, int max_uV)
2643{
c5f3939b 2644 struct regulator_dev *rdev = regulator->rdev;
a7a1ad90
MB		 2645 int i, voltages, ret;
2646
c5f3939b
MB		 2647 /* If we can't change voltage check the current voltage */
2648 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2649 ret = regulator_get_voltage(regulator);
2650 if (ret >= 0)
0d25d09d 2651 return min_uV <= ret && ret <= max_uV;
c5f3939b
MB		 2652 else
2653 return ret;
2654 }
2655
bd7a2b60
PM		 2656 /* Any voltage within constrains range is fine? */
2657 if (rdev->desc->continuous_voltage_range)
2658 return min_uV >= rdev->constraints->min_uV &&
2659 max_uV <= rdev->constraints->max_uV;
2660
a7a1ad90
MB		 2661 ret = regulator_count_voltages(regulator);
2662 if (ret < 0)
2663 return ret;
2664 voltages = ret;
2665
2666 for (i = 0; i < voltages; i++) {
2667 ret = regulator_list_voltage(regulator, i);
2668
2669 if (ret >= min_uV && ret <= max_uV)
2670 return 1;
2671 }
2672
2673 return 0;
2674}
a398eaa2 2675EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 2676
a204f41e
SH		 2677static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2678 int max_uV)
2679{
2680 const struct regulator_desc *desc = rdev->desc;
2681
2682 if (desc->ops->map_voltage)
2683 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2684
2685 if (desc->ops->list_voltage == regulator_list_voltage_linear)
2686 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2687
2688 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2689 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2690
2691 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2692}
2693
7179569a
HS		 2694static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2695 int min_uV, int max_uV,
2696 unsigned *selector)
2697{
2698 struct pre_voltage_change_data data;
2699 int ret;
2700
2701 data.old_uV = _regulator_get_voltage(rdev);
2702 data.min_uV = min_uV;
2703 data.max_uV = max_uV;
2704 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2705 &data);
2706 if (ret & NOTIFY_STOP_MASK)
2707 return -EINVAL;
2708
2709 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2710 if (ret >= 0)
2711 return ret;
2712
2713 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2714 (void *)data.old_uV);
2715
2716 return ret;
2717}
2718
2719static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2720 int uV, unsigned selector)
2721{
2722 struct pre_voltage_change_data data;
2723 int ret;
2724
2725 data.old_uV = _regulator_get_voltage(rdev);
2726 data.min_uV = uV;
2727 data.max_uV = uV;
2728 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2729 &data);
2730 if (ret & NOTIFY_STOP_MASK)
2731 return -EINVAL;
2732
2733 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2734 if (ret >= 0)
2735 return ret;
2736
2737 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2738 (void *)data.old_uV);
2739
2740 return ret;
2741}
2742
75790251
MB		 2743static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2744 int min_uV, int max_uV)
2745{
2746 int ret;
77af1b26 2747 int delay = 0;
e113d792 2748 int best_val = 0;
75790251 2749 unsigned int selector;
eba41a5e 2750 int old_selector = -1;
75790251
MB		 2751
2752 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2753
bf5892a8
MB		 2754 min_uV += rdev->constraints->uV_offset;
2755 max_uV += rdev->constraints->uV_offset;
2756
eba41a5e
AL		 2757 /*
2758 * If we can't obtain the old selector there is not enough
2759 * info to call set_voltage_time_sel().
2760 */
8b7485ef
AL		 2761 if (_regulator_is_enabled(rdev) &&
2762 rdev->desc->ops->set_voltage_time_sel &&
eba41a5e
AL		 2763 rdev->desc->ops->get_voltage_sel) {
2764 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2765 if (old_selector < 0)
2766 return old_selector;
2767 }
2768
75790251 2769 if (rdev->desc->ops->set_voltage) {
7179569a
HS		 2770 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2771 &selector);
e113d792
MB		 2772
2773 if (ret >= 0) {
2774 if (rdev->desc->ops->list_voltage)
2775 best_val = rdev->desc->ops->list_voltage(rdev,
2776 selector);
2777 else
2778 best_val = _regulator_get_voltage(rdev);
2779 }
2780
e8eef82b 2781 } else if (rdev->desc->ops->set_voltage_sel) {
a204f41e 2782 ret = regulator_map_voltage(rdev, min_uV, max_uV);
e843fc46 2783 if (ret >= 0) {
e113d792
MB		 2784 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2785 if (min_uV <= best_val && max_uV >= best_val) {
2786 selector = ret;
c66a566a
AL		 2787 if (old_selector == selector)
2788 ret = 0;
2789 else
7179569a
HS		 2790 ret = _regulator_call_set_voltage_sel(
2791 rdev, best_val, selector);
e113d792
MB		 2792 } else {
2793 ret = -EINVAL;
2794 }
e8eef82b 2795 }
75790251
MB		 2796 } else {
2797 ret = -EINVAL;
2798 }
e8eef82b 2799
eba41a5e 2800 /* Call set_voltage_time_sel if successfully obtained old_selector */
5b175952
YSB		 2801 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2802 && old_selector != selector) {
77af1b26 2803
eba41a5e
AL		 2804 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2805 old_selector, selector);
2806 if (delay < 0) {
2807 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2808 delay);
2809 delay = 0;
e8eef82b 2810 }
75790251 2811
8b96de31
PR		 2812 /* Insert any necessary delays */
2813 if (delay >= 1000) {
2814 mdelay(delay / 1000);
2815 udelay(delay % 1000);
2816 } else if (delay) {
2817 udelay(delay);
2818 }
77af1b26
LW		 2819 }
2820
2f6c797f
AL		 2821 if (ret == 0 && best_val >= 0) {
2822 unsigned long data = best_val;
2823
ded06a52 2824 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2f6c797f
AL		 2825 (void *)data);
2826 }
ded06a52 2827
eba41a5e 2828 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
75790251
MB		 2829
2830 return ret;
2831}
2832
a9f226bc
SH		 2833static int regulator_set_voltage_unlocked(struct regulator *regulator,
2834 int min_uV, int max_uV)
414c70cb
LG		 2835{
2836 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 2837 int ret = 0;
92d7a558 2838 int old_min_uV, old_max_uV;
c00dc359 2839 int current_uV;
fc42112c
SH		 2840 int best_supply_uV = 0;
2841 int supply_change_uV = 0;
414c70cb 2842
95a3c23a
MB		 2843 /* If we're setting the same range as last time the change
2844 * should be a noop (some cpufreq implementations use the same
2845 * voltage for multiple frequencies, for example).
2846 */
2847 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2848 goto out;
2849
c00dc359 2850 /* If we're trying to set a range that overlaps the current voltage,
d3fb9800 2851 * return successfully even though the regulator does not support
c00dc359
BA		 2852 * changing the voltage.
2853 */
2854 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2855 current_uV = _regulator_get_voltage(rdev);
2856 if (min_uV <= current_uV && current_uV <= max_uV) {
2857 regulator->min_uV = min_uV;
2858 regulator->max_uV = max_uV;
2859 goto out;
2860 }
2861 }
2862
414c70cb 2863 /* sanity check */
e8eef82b
MB		 2864 if (!rdev->desc->ops->set_voltage &&
2865 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 2866 ret = -EINVAL;
2867 goto out;
2868 }
2869
2870 /* constraints check */
2871 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2872 if (ret < 0)
2873 goto out;
0d25d09d 2874
92d7a558
PP		 2875 /* restore original values in case of error */
2876 old_min_uV = regulator->min_uV;
2877 old_max_uV = regulator->max_uV;
414c70cb
LG		 2878 regulator->min_uV = min_uV;
2879 regulator->max_uV = max_uV;
3a93f2a9 2880
05fda3b1
TP		 2881 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2882 if (ret < 0)
92d7a558 2883 goto out2;
05fda3b1 2884
fc42112c
SH		 2885 if (rdev->supply && (rdev->desc->min_dropout_uV ||
2886 !rdev->desc->ops->get_voltage)) {
2887 int current_supply_uV;
2888 int selector;
2889
2890 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2891 if (selector < 0) {
2892 ret = selector;
2893 goto out2;
2894 }
2895
2896 best_supply_uV = _regulator_list_voltage(regulator, selector, 0);
2897 if (best_supply_uV < 0) {
2898 ret = best_supply_uV;
2899 goto out2;
2900 }
2901
2902 best_supply_uV += rdev->desc->min_dropout_uV;
2903
2904 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2905 if (current_supply_uV < 0) {
2906 ret = current_supply_uV;
2907 goto out2;
2908 }
2909
2910 supply_change_uV = best_supply_uV - current_supply_uV;
2911 }
2912
2913 if (supply_change_uV > 0) {
2914 ret = regulator_set_voltage_unlocked(rdev->supply,
2915 best_supply_uV, INT_MAX);
2916 if (ret) {
2917 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
2918 ret);
2919 goto out2;
2920 }
2921 }
2922
75790251 2923 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
92d7a558
PP		 2924 if (ret < 0)
2925 goto out2;
0d25d09d 2926
fc42112c
SH		 2927 if (supply_change_uV < 0) {
2928 ret = regulator_set_voltage_unlocked(rdev->supply,
2929 best_supply_uV, INT_MAX);
2930 if (ret)
2931 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
2932 ret);
2933 /* No need to fail here */
2934 ret = 0;
2935 }
2936
414c70cb 2937out:
414c70cb 2938 return ret;
92d7a558
PP		 2939out2:
2940 regulator->min_uV = old_min_uV;
2941 regulator->max_uV = old_max_uV;
a9f226bc
SH		 2942
2943 return ret;
2944}
2945
2946/**
2947 * regulator_set_voltage - set regulator output voltage
2948 * @regulator: regulator source
2949 * @min_uV: Minimum required voltage in uV
2950 * @max_uV: Maximum acceptable voltage in uV
2951 *
2952 * Sets a voltage regulator to the desired output voltage. This can be set
2953 * during any regulator state. IOW, regulator can be disabled or enabled.
2954 *
2955 * If the regulator is enabled then the voltage will change to the new value
2956 * immediately otherwise if the regulator is disabled the regulator will
2957 * output at the new voltage when enabled.
2958 *
2959 * NOTE: If the regulator is shared between several devices then the lowest
2960 * request voltage that meets the system constraints will be used.
2961 * Regulator system constraints must be set for this regulator before
2962 * calling this function otherwise this call will fail.
2963 */
2964int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2965{
2966 int ret = 0;
2967
fc42112c 2968 regulator_lock_supply(regulator->rdev);
a9f226bc
SH		 2969
2970 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
2971
fc42112c 2972 regulator_unlock_supply(regulator->rdev);
a9f226bc 2973
414c70cb
LG		 2974 return ret;
2975}
2976EXPORT_SYMBOL_GPL(regulator_set_voltage);
2977
88cd222b
LW		 2978/**
2979 * regulator_set_voltage_time - get raise/fall time
2980 * @regulator: regulator source
2981 * @old_uV: starting voltage in microvolts
2982 * @new_uV: target voltage in microvolts
2983 *
2984 * Provided with the starting and ending voltage, this function attempts to
2985 * calculate the time in microseconds required to rise or fall to this new
2986 * voltage.
2987 */
2988int regulator_set_voltage_time(struct regulator *regulator,
2989 int old_uV, int new_uV)
2990{
272e2315
GX		 2991 struct regulator_dev *rdev = regulator->rdev;
2992 const struct regulator_ops *ops = rdev->desc->ops;
88cd222b
LW		 2993 int old_sel = -1;
2994 int new_sel = -1;
2995 int voltage;
2996 int i;
2997
2998 /* Currently requires operations to do this */
2999 if (!ops->list_voltage || !ops->set_voltage_time_sel
3000 || !rdev->desc->n_voltages)
3001 return -EINVAL;
3002
3003 for (i = 0; i < rdev->desc->n_voltages; i++) {
3004 /* We only look for exact voltage matches here */
3005 voltage = regulator_list_voltage(regulator, i);
3006 if (voltage < 0)
3007 return -EINVAL;
3008 if (voltage == 0)
3009 continue;
3010 if (voltage == old_uV)
3011 old_sel = i;
3012 if (voltage == new_uV)
3013 new_sel = i;
3014 }
3015
3016 if (old_sel < 0 || new_sel < 0)
3017 return -EINVAL;
3018
3019 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3020}
3021EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3022
98a175b6 3023/**
296c6566
RD		 3024 * regulator_set_voltage_time_sel - get raise/fall time
3025 * @rdev: regulator source device
98a175b6
YSB		 3026 * @old_selector: selector for starting voltage
3027 * @new_selector: selector for target voltage
3028 *
3029 * Provided with the starting and target voltage selectors, this function
3030 * returns time in microseconds required to rise or fall to this new voltage
3031 *
f11d08c3 3032 * Drivers providing ramp_delay in regulation_constraints can use this as their
398715ab 3033 * set_voltage_time_sel() operation.
98a175b6
YSB		 3034 */
3035int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3036 unsigned int old_selector,
3037 unsigned int new_selector)
3038{
398715ab 3039 unsigned int ramp_delay = 0;
f11d08c3 3040 int old_volt, new_volt;
398715ab
AL		 3041
3042 if (rdev->constraints->ramp_delay)
3043 ramp_delay = rdev->constraints->ramp_delay;
3044 else if (rdev->desc->ramp_delay)
3045 ramp_delay = rdev->desc->ramp_delay;
3046
3047 if (ramp_delay == 0) {
6f0b2c69 3048 rdev_warn(rdev, "ramp_delay not set\n");
398715ab 3049 return 0;
6f0b2c69 3050 }
398715ab 3051
f11d08c3
AL		 3052 /* sanity check */
3053 if (!rdev->desc->ops->list_voltage)
3054 return -EINVAL;
398715ab 3055
f11d08c3
AL		 3056 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3057 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3058
3059 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
98a175b6 3060}
b19dbf71 3061EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
98a175b6 3062
606a2562
MB		 3063/**
3064 * regulator_sync_voltage - re-apply last regulator output voltage
3065 * @regulator: regulator source
3066 *
3067 * Re-apply the last configured voltage. This is intended to be used
3068 * where some external control source the consumer is cooperating with
3069 * has caused the configured voltage to change.
3070 */
3071int regulator_sync_voltage(struct regulator *regulator)
3072{
3073 struct regulator_dev *rdev = regulator->rdev;
3074 int ret, min_uV, max_uV;
3075
3076 mutex_lock(&rdev->mutex);
3077
3078 if (!rdev->desc->ops->set_voltage &&
3079 !rdev->desc->ops->set_voltage_sel) {
3080 ret = -EINVAL;
3081 goto out;
3082 }
3083
3084 /* This is only going to work if we've had a voltage configured. */
3085 if (!regulator->min_uV && !regulator->max_uV) {
3086 ret = -EINVAL;
3087 goto out;
3088 }
3089
3090 min_uV = regulator->min_uV;
3091 max_uV = regulator->max_uV;
3092
3093 /* This should be a paranoia check... */
3094 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3095 if (ret < 0)
3096 goto out;
3097
3098 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
3099 if (ret < 0)
3100 goto out;
3101
3102 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3103
3104out:
3105 mutex_unlock(&rdev->mutex);
3106 return ret;
3107}
3108EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3109
414c70cb
LG		 3110static int _regulator_get_voltage(struct regulator_dev *rdev)
3111{
bf5892a8 3112 int sel, ret;
fef95019
MB		 3113 bool bypassed;
3114
3115 if (rdev->desc->ops->get_bypass) {
3116 ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
3117 if (ret < 0)
3118 return ret;
3119 if (bypassed) {
3120 /* if bypassed the regulator must have a supply */
3121 if (!rdev->supply)
3122 return -EINVAL;
3123
3124 return _regulator_get_voltage(rdev->supply->rdev);
3125 }
3126 }
476c2d83
MB		 3127
3128 if (rdev->desc->ops->get_voltage_sel) {
3129 sel = rdev->desc->ops->get_voltage_sel(rdev);
3130 if (sel < 0)
3131 return sel;
bf5892a8 3132 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 3133 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 3134 ret = rdev->desc->ops->get_voltage(rdev);
f7df20ec
MB		 3135 } else if (rdev->desc->ops->list_voltage) {
3136 ret = rdev->desc->ops->list_voltage(rdev, 0);
5a523605
LD		 3137 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3138 ret = rdev->desc->fixed_uV;
e303996e 3139 } else if (rdev->supply) {
d9b96d35 3140 ret = _regulator_get_voltage(rdev->supply->rdev);
cb220d16 3141 } else {
414c70cb 3142 return -EINVAL;
cb220d16 3143 }
bf5892a8 3144
cb220d16
AL		 3145 if (ret < 0)
3146 return ret;
bf5892a8 3147 return ret - rdev->constraints->uV_offset;
414c70cb
LG		 3148}
3149
3150/**
3151 * regulator_get_voltage - get regulator output voltage
3152 * @regulator: regulator source
3153 *
3154 * This returns the current regulator voltage in uV.
3155 *
3156 * NOTE: If the regulator is disabled it will return the voltage value. This
3157 * function should not be used to determine regulator state.
3158 */
3159int regulator_get_voltage(struct regulator *regulator)
3160{
3161 int ret;
3162
d9b96d35 3163 regulator_lock_supply(regulator->rdev);
414c70cb
LG		 3164
3165 ret = _regulator_get_voltage(regulator->rdev);
3166
d9b96d35 3167 regulator_unlock_supply(regulator->rdev);
414c70cb
LG		 3168
3169 return ret;
3170}
3171EXPORT_SYMBOL_GPL(regulator_get_voltage);
3172
3173/**
3174 * regulator_set_current_limit - set regulator output current limit
3175 * @regulator: regulator source
ce0d10f8 3176 * @min_uA: Minimum supported current in uA
414c70cb
LG		 3177 * @max_uA: Maximum supported current in uA
3178 *
3179 * Sets current sink to the desired output current. This can be set during
3180 * any regulator state. IOW, regulator can be disabled or enabled.
3181 *
3182 * If the regulator is enabled then the current will change to the new value
3183 * immediately otherwise if the regulator is disabled the regulator will
3184 * output at the new current when enabled.
3185 *
3186 * NOTE: Regulator system constraints must be set for this regulator before
3187 * calling this function otherwise this call will fail.
3188 */
3189int regulator_set_current_limit(struct regulator *regulator,
3190 int min_uA, int max_uA)
3191{
3192 struct regulator_dev *rdev = regulator->rdev;
3193 int ret;
3194
3195 mutex_lock(&rdev->mutex);
3196
3197 /* sanity check */
3198 if (!rdev->desc->ops->set_current_limit) {
3199 ret = -EINVAL;
3200 goto out;
3201 }
3202
3203 /* constraints check */
3204 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3205 if (ret < 0)
3206 goto out;
3207
3208 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3209out:
3210 mutex_unlock(&rdev->mutex);
3211 return ret;
3212}
3213EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3214
3215static int _regulator_get_current_limit(struct regulator_dev *rdev)
3216{
3217 int ret;
3218
3219 mutex_lock(&rdev->mutex);
3220
3221 /* sanity check */
3222 if (!rdev->desc->ops->get_current_limit) {
3223 ret = -EINVAL;
3224 goto out;
3225 }
3226
3227 ret = rdev->desc->ops->get_current_limit(rdev);
3228out:
3229 mutex_unlock(&rdev->mutex);
3230 return ret;
3231}
3232
3233/**
3234 * regulator_get_current_limit - get regulator output current
3235 * @regulator: regulator source
3236 *
3237 * This returns the current supplied by the specified current sink in uA.
3238 *
3239 * NOTE: If the regulator is disabled it will return the current value. This
3240 * function should not be used to determine regulator state.
3241 */
3242int regulator_get_current_limit(struct regulator *regulator)
3243{
3244 return _regulator_get_current_limit(regulator->rdev);
3245}
3246EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3247
3248/**
3249 * regulator_set_mode - set regulator operating mode
3250 * @regulator: regulator source
3251 * @mode: operating mode - one of the REGULATOR_MODE constants
3252 *
3253 * Set regulator operating mode to increase regulator efficiency or improve
3254 * regulation performance.
3255 *
3256 * NOTE: Regulator system constraints must be set for this regulator before
3257 * calling this function otherwise this call will fail.
3258 */
3259int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3260{
3261 struct regulator_dev *rdev = regulator->rdev;
3262 int ret;
500b4ac9 3263 int regulator_curr_mode;
414c70cb
LG		 3264
3265 mutex_lock(&rdev->mutex);
3266
3267 /* sanity check */
3268 if (!rdev->desc->ops->set_mode) {
3269 ret = -EINVAL;
3270 goto out;
3271 }
3272
500b4ac9
SI		 3273 /* return if the same mode is requested */
3274 if (rdev->desc->ops->get_mode) {
3275 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3276 if (regulator_curr_mode == mode) {
3277 ret = 0;
3278 goto out;
3279 }
3280 }
3281
414c70cb 3282 /* constraints check */
22c51b47 3283 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 3284 if (ret < 0)
3285 goto out;
3286
3287 ret = rdev->desc->ops->set_mode(rdev, mode);
3288out:
3289 mutex_unlock(&rdev->mutex);
3290 return ret;
3291}
3292EXPORT_SYMBOL_GPL(regulator_set_mode);
3293
3294static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3295{
3296 int ret;
3297
3298 mutex_lock(&rdev->mutex);
3299
3300 /* sanity check */
3301 if (!rdev->desc->ops->get_mode) {
3302 ret = -EINVAL;
3303 goto out;
3304 }
3305
3306 ret = rdev->desc->ops->get_mode(rdev);
3307out:
3308 mutex_unlock(&rdev->mutex);
3309 return ret;
3310}
3311
3312/**
3313 * regulator_get_mode - get regulator operating mode
3314 * @regulator: regulator source
3315 *
3316 * Get the current regulator operating mode.
3317 */
3318unsigned int regulator_get_mode(struct regulator *regulator)
3319{
3320 return _regulator_get_mode(regulator->rdev);
3321}
3322EXPORT_SYMBOL_GPL(regulator_get_mode);
3323
3324/**
e39ce48f 3325 * regulator_set_load - set regulator load
414c70cb
LG		 3326 * @regulator: regulator source
3327 * @uA_load: load current
3328 *
3329 * Notifies the regulator core of a new device load. This is then used by
3330 * DRMS (if enabled by constraints) to set the most efficient regulator
3331 * operating mode for the new regulator loading.
3332 *
3333 * Consumer devices notify their supply regulator of the maximum power
3334 * they will require (can be taken from device datasheet in the power
3335 * consumption tables) when they change operational status and hence power
3336 * state. Examples of operational state changes that can affect power
3337 * consumption are :-
3338 *
3339 * o Device is opened / closed.
3340 * o Device I/O is about to begin or has just finished.
3341 * o Device is idling in between work.
3342 *
3343 * This information is also exported via sysfs to userspace.
3344 *
3345 * DRMS will sum the total requested load on the regulator and change
3346 * to the most efficient operating mode if platform constraints allow.
3347 *
e39ce48f 3348 * On error a negative errno is returned.
414c70cb 3349 */
e39ce48f 3350int regulator_set_load(struct regulator *regulator, int uA_load)
414c70cb
LG		 3351{
3352 struct regulator_dev *rdev = regulator->rdev;
8460ef38 3353 int ret;
d92d95b6 3354
414c70cb 3355 mutex_lock(&rdev->mutex);
414c70cb 3356 regulator->uA_load = uA_load;
8460ef38 3357 ret = drms_uA_update(rdev);
414c70cb 3358 mutex_unlock(&rdev->mutex);
8460ef38 3359
414c70cb
LG		 3360 return ret;
3361}
e39ce48f 3362EXPORT_SYMBOL_GPL(regulator_set_load);
414c70cb 3363
f59c8f9f
MB		 3364/**
3365 * regulator_allow_bypass - allow the regulator to go into bypass mode
3366 *
3367 * @regulator: Regulator to configure
9345dfb8 3368 * @enable: enable or disable bypass mode
f59c8f9f
MB		 3369 *
3370 * Allow the regulator to go into bypass mode if all other consumers
3371 * for the regulator also enable bypass mode and the machine
3372 * constraints allow this. Bypass mode means that the regulator is
3373 * simply passing the input directly to the output with no regulation.
3374 */
3375int regulator_allow_bypass(struct regulator *regulator, bool enable)
3376{
3377 struct regulator_dev *rdev = regulator->rdev;
3378 int ret = 0;
3379
3380 if (!rdev->desc->ops->set_bypass)
3381 return 0;
3382
3383 if (rdev->constraints &&
3384 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3385 return 0;
3386
3387 mutex_lock(&rdev->mutex);
3388
3389 if (enable && !regulator->bypass) {
3390 rdev->bypass_count++;
3391
3392 if (rdev->bypass_count == rdev->open_count) {
3393 ret = rdev->desc->ops->set_bypass(rdev, enable);
3394 if (ret != 0)
3395 rdev->bypass_count--;
3396 }
3397
3398 } else if (!enable && regulator->bypass) {
3399 rdev->bypass_count--;
3400
3401 if (rdev->bypass_count != rdev->open_count) {
3402 ret = rdev->desc->ops->set_bypass(rdev, enable);
3403 if (ret != 0)
3404 rdev->bypass_count++;
3405 }
3406 }
3407
3408 if (ret == 0)
3409 regulator->bypass = enable;
3410
3411 mutex_unlock(&rdev->mutex);
3412
3413 return ret;
3414}
3415EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3416
414c70cb
LG		 3417/**
3418 * regulator_register_notifier - register regulator event notifier
3419 * @regulator: regulator source
69279fb9 3420 * @nb: notifier block
414c70cb
LG		 3421 *
3422 * Register notifier block to receive regulator events.
3423 */
3424int regulator_register_notifier(struct regulator *regulator,
3425 struct notifier_block *nb)
3426{
3427 return blocking_notifier_chain_register(&regulator->rdev->notifier,
3428 nb);
3429}
3430EXPORT_SYMBOL_GPL(regulator_register_notifier);
3431
3432/**
3433 * regulator_unregister_notifier - unregister regulator event notifier
3434 * @regulator: regulator source
69279fb9 3435 * @nb: notifier block
414c70cb
LG		 3436 *
3437 * Unregister regulator event notifier block.
3438 */
3439int regulator_unregister_notifier(struct regulator *regulator,
3440 struct notifier_block *nb)
3441{
3442 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
3443 nb);
3444}
3445EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3446
b136fb44
JC		 3447/* notify regulator consumers and downstream regulator consumers.
3448 * Note mutex must be held by caller.
3449 */
7179569a 3450static int _notifier_call_chain(struct regulator_dev *rdev,
414c70cb
LG		 3451 unsigned long event, void *data)
3452{
414c70cb 3453 /* call rdev chain first */
7179569a 3454 return blocking_notifier_call_chain(&rdev->notifier, event, data);
414c70cb
LG		 3455}
3456
3457/**
3458 * regulator_bulk_get - get multiple regulator consumers
3459 *
3460 * @dev: Device to supply
3461 * @num_consumers: Number of consumers to register
3462 * @consumers: Configuration of consumers; clients are stored here.
3463 *
3464 * @return 0 on success, an errno on failure.
3465 *
3466 * This helper function allows drivers to get several regulator
3467 * consumers in one operation. If any of the regulators cannot be
3468 * acquired then any regulators that were allocated will be freed
3469 * before returning to the caller.
3470 */
3471int regulator_bulk_get(struct device *dev, int num_consumers,
3472 struct regulator_bulk_data *consumers)
3473{
3474 int i;
3475 int ret;
3476
3477 for (i = 0; i < num_consumers; i++)
3478 consumers[i].consumer = NULL;
3479
3480 for (i = 0; i < num_consumers; i++) {
3ff3f518
BA		 3481 consumers[i].consumer = _regulator_get(dev,
3482 consumers[i].supply,
3483 false,
3484 !consumers[i].optional);
414c70cb 3485 if (IS_ERR(consumers[i].consumer)) {
414c70cb 3486 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 3487 dev_err(dev, "Failed to get supply '%s': %d\n",
3488 consumers[i].supply, ret);
414c70cb
LG		 3489 consumers[i].consumer = NULL;
3490 goto err;
3491 }
3492 }
3493
3494 return 0;
3495
3496err:
b29c7690 3497 while (--i >= 0)
414c70cb
LG		 3498 regulator_put(consumers[i].consumer);
3499
3500 return ret;
3501}
3502EXPORT_SYMBOL_GPL(regulator_bulk_get);
3503
f21e0e81
MB		 3504static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3505{
3506 struct regulator_bulk_data *bulk = data;
3507
3508 bulk->ret = regulator_enable(bulk->consumer);
3509}
3510
414c70cb
LG		 3511/**
3512 * regulator_bulk_enable - enable multiple regulator consumers
3513 *
3514 * @num_consumers: Number of consumers
3515 * @consumers: Consumer data; clients are stored here.
3516 * @return 0 on success, an errno on failure
3517 *
3518 * This convenience API allows consumers to enable multiple regulator
3519 * clients in a single API call. If any consumers cannot be enabled
3520 * then any others that were enabled will be disabled again prior to
3521 * return.
3522 */
3523int regulator_bulk_enable(int num_consumers,
3524 struct regulator_bulk_data *consumers)
3525{
2955b47d 3526 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
414c70cb 3527 int i;
f21e0e81 3528 int ret = 0;
414c70cb 3529
6492bc1b
MB		 3530 for (i = 0; i < num_consumers; i++) {
3531 if (consumers[i].consumer->always_on)
3532 consumers[i].ret = 0;
3533 else
3534 async_schedule_domain(regulator_bulk_enable_async,
3535 &consumers[i], &async_domain);
3536 }
f21e0e81
MB		 3537
3538 async_synchronize_full_domain(&async_domain);
3539
3540 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 3541 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 3542 if (consumers[i].ret != 0) {
3543 ret = consumers[i].ret;
414c70cb 3544 goto err;
f21e0e81 3545 }
414c70cb
LG		 3546 }
3547
3548 return 0;
3549
3550err:
fbe31057
AH		 3551 for (i = 0; i < num_consumers; i++) {
3552 if (consumers[i].ret < 0)
3553 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3554 consumers[i].ret);
3555 else
3556 regulator_disable(consumers[i].consumer);
3557 }
414c70cb
LG		 3558
3559 return ret;
3560}
3561EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3562
3563/**
3564 * regulator_bulk_disable - disable multiple regulator consumers
3565 *
3566 * @num_consumers: Number of consumers
3567 * @consumers: Consumer data; clients are stored here.
3568 * @return 0 on success, an errno on failure
3569 *
3570 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 3571 * clients in a single API call. If any consumers cannot be disabled
3572 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 3573 * return.
3574 */
3575int regulator_bulk_disable(int num_consumers,
3576 struct regulator_bulk_data *consumers)
3577{
3578 int i;
01e86f49 3579 int ret, r;
414c70cb 3580
49e22632 3581 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 3582 ret = regulator_disable(consumers[i].consumer);
3583 if (ret != 0)
3584 goto err;
3585 }
3586
3587 return 0;
3588
3589err:
5da84fd9 3590 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
01e86f49
MB		 3591 for (++i; i < num_consumers; ++i) {
3592 r = regulator_enable(consumers[i].consumer);
3593 if (r != 0)
3594 pr_err("Failed to reename %s: %d\n",
3595 consumers[i].supply, r);
3596 }
414c70cb
LG		 3597
3598 return ret;
3599}
3600EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3601
e1de2f42
DK		 3602/**
3603 * regulator_bulk_force_disable - force disable multiple regulator consumers
3604 *
3605 * @num_consumers: Number of consumers
3606 * @consumers: Consumer data; clients are stored here.
3607 * @return 0 on success, an errno on failure
3608 *
3609 * This convenience API allows consumers to forcibly disable multiple regulator
3610 * clients in a single API call.
3611 * NOTE: This should be used for situations when device damage will
3612 * likely occur if the regulators are not disabled (e.g. over temp).
3613 * Although regulator_force_disable function call for some consumers can
3614 * return error numbers, the function is called for all consumers.
3615 */
3616int regulator_bulk_force_disable(int num_consumers,
3617 struct regulator_bulk_data *consumers)
3618{
3619 int i;
3620 int ret;
3621
3622 for (i = 0; i < num_consumers; i++)
3623 consumers[i].ret =
3624 regulator_force_disable(consumers[i].consumer);
3625
3626 for (i = 0; i < num_consumers; i++) {
3627 if (consumers[i].ret != 0) {
3628 ret = consumers[i].ret;
3629 goto out;
3630 }
3631 }
3632
3633 return 0;
3634out:
3635 return ret;
3636}
3637EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3638
414c70cb
LG		 3639/**
3640 * regulator_bulk_free - free multiple regulator consumers
3641 *
3642 * @num_consumers: Number of consumers
3643 * @consumers: Consumer data; clients are stored here.
3644 *
3645 * This convenience API allows consumers to free multiple regulator
3646 * clients in a single API call.
3647 */
3648void regulator_bulk_free(int num_consumers,
3649 struct regulator_bulk_data *consumers)
3650{
3651 int i;
3652
3653 for (i = 0; i < num_consumers; i++) {
3654 regulator_put(consumers[i].consumer);
3655 consumers[i].consumer = NULL;
3656 }
3657}
3658EXPORT_SYMBOL_GPL(regulator_bulk_free);
3659
3660/**
3661 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 3662 * @rdev: regulator source
414c70cb 3663 * @event: notifier block
69279fb9 3664 * @data: callback-specific data.
414c70cb
LG		 3665 *
3666 * Called by regulator drivers to notify clients a regulator event has
3667 * occurred. We also notify regulator clients downstream.
b136fb44 3668 * Note lock must be held by caller.
414c70cb
LG		 3669 */
3670int regulator_notifier_call_chain(struct regulator_dev *rdev,
3671 unsigned long event, void *data)
3672{
70cfef26
KK		 3673 lockdep_assert_held_once(&rdev->mutex);
3674
414c70cb
LG		 3675 _notifier_call_chain(rdev, event, data);
3676 return NOTIFY_DONE;
3677
3678}
3679EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3680
be721979
MB		 3681/**
3682 * regulator_mode_to_status - convert a regulator mode into a status
3683 *
3684 * @mode: Mode to convert
3685 *
3686 * Convert a regulator mode into a status.
3687 */
3688int regulator_mode_to_status(unsigned int mode)
3689{
3690 switch (mode) {
3691 case REGULATOR_MODE_FAST:
3692 return REGULATOR_STATUS_FAST;
3693 case REGULATOR_MODE_NORMAL:
3694 return REGULATOR_STATUS_NORMAL;
3695 case REGULATOR_MODE_IDLE:
3696 return REGULATOR_STATUS_IDLE;
03ffcf3d 3697 case REGULATOR_MODE_STANDBY:
be721979
MB		 3698 return REGULATOR_STATUS_STANDBY;
3699 default:
1beaf762 3700 return REGULATOR_STATUS_UNDEFINED;
be721979
MB		 3701 }
3702}
3703EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3704
39f802d6
TI		 3705static struct attribute *regulator_dev_attrs[] = {
3706 &dev_attr_name.attr,
3707 &dev_attr_num_users.attr,
3708 &dev_attr_type.attr,
3709 &dev_attr_microvolts.attr,
3710 &dev_attr_microamps.attr,
3711 &dev_attr_opmode.attr,
3712 &dev_attr_state.attr,
3713 &dev_attr_status.attr,
3714 &dev_attr_bypass.attr,
3715 &dev_attr_requested_microamps.attr,
3716 &dev_attr_min_microvolts.attr,
3717 &dev_attr_max_microvolts.attr,
3718 &dev_attr_min_microamps.attr,
3719 &dev_attr_max_microamps.attr,
3720 &dev_attr_suspend_standby_state.attr,
3721 &dev_attr_suspend_mem_state.attr,
3722 &dev_attr_suspend_disk_state.attr,
3723 &dev_attr_suspend_standby_microvolts.attr,
3724 &dev_attr_suspend_mem_microvolts.attr,
3725 &dev_attr_suspend_disk_microvolts.attr,
3726 &dev_attr_suspend_standby_mode.attr,
3727 &dev_attr_suspend_mem_mode.attr,
3728 &dev_attr_suspend_disk_mode.attr,
3729 NULL
3730};
3731
7ad68e2f
DB		 3732/*
3733 * To avoid cluttering sysfs (and memory) with useless state, only
3734 * create attributes that can be meaningfully displayed.
3735 */
39f802d6
TI		 3736static umode_t regulator_attr_is_visible(struct kobject *kobj,
3737 struct attribute *attr, int idx)
7ad68e2f 3738{
39f802d6 3739 struct device *dev = kobj_to_dev(kobj);
83080a14 3740 struct regulator_dev *rdev = dev_to_rdev(dev);
272e2315 3741 const struct regulator_ops *ops = rdev->desc->ops;
39f802d6
TI		 3742 umode_t mode = attr->mode;
3743
3744 /* these three are always present */
3745 if (attr == &dev_attr_name.attr ||
3746 attr == &dev_attr_num_users.attr ||
3747 attr == &dev_attr_type.attr)
3748 return mode;
7ad68e2f
DB		 3749
3750 /* some attributes need specific methods to be displayed */
39f802d6
TI		 3751 if (attr == &dev_attr_microvolts.attr) {
3752 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3753 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3754 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3755 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3756 return mode;
3757 return 0;
f59c8f9f 3758 }
7ad68e2f 3759
39f802d6
TI		 3760 if (attr == &dev_attr_microamps.attr)
3761 return ops->get_current_limit ? mode : 0;
3762
3763 if (attr == &dev_attr_opmode.attr)
3764 return ops->get_mode ? mode : 0;
3765
3766 if (attr == &dev_attr_state.attr)
3767 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3768
3769 if (attr == &dev_attr_status.attr)
3770 return ops->get_status ? mode : 0;
3771
3772 if (attr == &dev_attr_bypass.attr)
3773 return ops->get_bypass ? mode : 0;
3774
7ad68e2f 3775 /* some attributes are type-specific */
39f802d6
TI		 3776 if (attr == &dev_attr_requested_microamps.attr)
3777 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
7ad68e2f 3778
7ad68e2f 3779 /* constraints need specific supporting methods */
39f802d6
TI		 3780 if (attr == &dev_attr_min_microvolts.attr ||
3781 attr == &dev_attr_max_microvolts.attr)
3782 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3783
3784 if (attr == &dev_attr_min_microamps.attr ||
3785 attr == &dev_attr_max_microamps.attr)
3786 return ops->set_current_limit ? mode : 0;
3787
3788 if (attr == &dev_attr_suspend_standby_state.attr ||
3789 attr == &dev_attr_suspend_mem_state.attr ||
3790 attr == &dev_attr_suspend_disk_state.attr)
3791 return mode;
3792
3793 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3794 attr == &dev_attr_suspend_mem_microvolts.attr ||
3795 attr == &dev_attr_suspend_disk_microvolts.attr)
3796 return ops->set_suspend_voltage ? mode : 0;
3797
3798 if (attr == &dev_attr_suspend_standby_mode.attr ||
3799 attr == &dev_attr_suspend_mem_mode.attr ||
3800 attr == &dev_attr_suspend_disk_mode.attr)
3801 return ops->set_suspend_mode ? mode : 0;
3802
3803 return mode;
3804}
3805
3806static const struct attribute_group regulator_dev_group = {
3807 .attrs = regulator_dev_attrs,
3808 .is_visible = regulator_attr_is_visible,
3809};
3810
3811static const struct attribute_group *regulator_dev_groups[] = {
3812 &regulator_dev_group,
3813 NULL
3814};
7ad68e2f 3815
39f802d6
TI		 3816static void regulator_dev_release(struct device *dev)
3817{
3818 struct regulator_dev *rdev = dev_get_drvdata(dev);
29f5f486
MB		 3819
3820 kfree(rdev->constraints);
3821 of_node_put(rdev->dev.of_node);
39f802d6 3822 kfree(rdev);
7ad68e2f
DB		 3823}
3824
39f802d6
TI		 3825static struct class regulator_class = {
3826 .name = "regulator",
3827 .dev_release = regulator_dev_release,
3828 .dev_groups = regulator_dev_groups,
3829};
3830
1130e5b3
MB		 3831static void rdev_init_debugfs(struct regulator_dev *rdev)
3832{
a9eaa813
GR		 3833 struct device *parent = rdev->dev.parent;
3834 const char *rname = rdev_get_name(rdev);
3835 char name[NAME_MAX];
3836
3837 /* Avoid duplicate debugfs directory names */
3838 if (parent && rname == rdev->desc->name) {
3839 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3840 rname);
3841 rname = name;
3842 }
3843
3844 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
24751434 3845 if (!rdev->debugfs) {
1130e5b3 3846 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 3847 return;
3848 }
3849
3850 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3851 &rdev->use_count);
3852 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3853 &rdev->open_count);
f59c8f9f
MB		 3854 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3855 &rdev->bypass_count);
1130e5b3
MB		 3856}
3857
5e3ca2b3
JMC		 3858static int regulator_register_resolve_supply(struct device *dev, void *data)
3859{
7ddede6a
JH		 3860 struct regulator_dev *rdev = dev_to_rdev(dev);
3861
3862 if (regulator_resolve_supply(rdev))
3863 rdev_dbg(rdev, "unable to resolve supply\n");
3864
3865 return 0;
5e3ca2b3
JMC		 3866}
3867
414c70cb
LG		 3868/**
3869 * regulator_register - register regulator
69279fb9 3870 * @regulator_desc: regulator to register
f47531b1 3871 * @cfg: runtime configuration for regulator
414c70cb
LG		 3872 *
3873 * Called by regulator drivers to register a regulator.
0384618a
AL		 3874 * Returns a valid pointer to struct regulator_dev on success
3875 * or an ERR_PTR() on error.
414c70cb 3876 */
65f26846
MB		 3877struct regulator_dev *
3878regulator_register(const struct regulator_desc *regulator_desc,
1b3de223 3879 const struct regulator_config *cfg)
414c70cb 3880{
9a8f5e07 3881 const struct regulation_constraints *constraints = NULL;
c172708d 3882 const struct regulator_init_data *init_data;
1b3de223 3883 struct regulator_config *config = NULL;
72dca06f 3884 static atomic_t regulator_no = ATOMIC_INIT(-1);
414c70cb 3885 struct regulator_dev *rdev;
32c8fad4 3886 struct device *dev;
a5766f11 3887 int ret, i;
414c70cb 3888
1b3de223 3889 if (regulator_desc == NULL || cfg == NULL)
414c70cb
LG		 3890 return ERR_PTR(-EINVAL);
3891
1b3de223 3892 dev = cfg->dev;
dcf70112 3893 WARN_ON(!dev);
32c8fad4 3894
414c70cb
LG		 3895 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3896 return ERR_PTR(-EINVAL);
3897
cd78dfc6
DL		 3898 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3899 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 3900 return ERR_PTR(-EINVAL);
3901
476c2d83
MB		 3902 /* Only one of each should be implemented */
3903 WARN_ON(regulator_desc->ops->get_voltage &&
3904 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 3905 WARN_ON(regulator_desc->ops->set_voltage &&
3906 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 3907
3908 /* If we're using selectors we must implement list_voltage. */
3909 if (regulator_desc->ops->get_voltage_sel &&
3910 !regulator_desc->ops->list_voltage) {
3911 return ERR_PTR(-EINVAL);
3912 }
e8eef82b
MB		 3913 if (regulator_desc->ops->set_voltage_sel &&
3914 !regulator_desc->ops->list_voltage) {
3915 return ERR_PTR(-EINVAL);
3916 }
476c2d83 3917
414c70cb
LG		 3918 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3919 if (rdev == NULL)
3920 return ERR_PTR(-ENOMEM);
3921
1b3de223
KK		 3922 /*
3923 * Duplicate the config so the driver could override it after
3924 * parsing init data.
3925 */
3926 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
3927 if (config == NULL) {
3928 kfree(rdev);
3929 return ERR_PTR(-ENOMEM);
3930 }
3931
bfa21a0d 3932 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
a0c7b164
MB		 3933 &rdev->dev.of_node);
3934 if (!init_data) {
3935 init_data = config->init_data;
3936 rdev->dev.of_node = of_node_get(config->of_node);
3937 }
3938
414c70cb
LG		 3939 mutex_lock(&regulator_list_mutex);
3940
3941 mutex_init(&rdev->mutex);
c172708d 3942 rdev->reg_data = config->driver_data;
414c70cb
LG		 3943 rdev->owner = regulator_desc->owner;
3944 rdev->desc = regulator_desc;
3a4b0a07
MB		 3945 if (config->regmap)
3946 rdev->regmap = config->regmap;
52b84dac 3947 else if (dev_get_regmap(dev, NULL))
3a4b0a07 3948 rdev->regmap = dev_get_regmap(dev, NULL);
52b84dac
AC		 3949 else if (dev->parent)
3950 rdev->regmap = dev_get_regmap(dev->parent, NULL);
414c70cb 3951 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 3952 INIT_LIST_HEAD(&rdev->list);
414c70cb 3953 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 3954 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 3955
a5766f11 3956 /* preform any regulator specific init */
9a8f5e07 3957 if (init_data && init_data->regulator_init) {
a5766f11 3958 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 3959 if (ret < 0)
3960 goto clean;
a5766f11
LG		 3961 }
3962
daad134d
KA		 3963 if ((config->ena_gpio || config->ena_gpio_initialized) &&
3964 gpio_is_valid(config->ena_gpio)) {
3965 ret = regulator_ena_gpio_request(rdev, config);
3966 if (ret != 0) {
3967 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3968 config->ena_gpio, ret);
32165230 3969 goto clean;
daad134d
KA		 3970 }
3971 }
3972
a5766f11 3973 /* register with sysfs */
414c70cb 3974 rdev->dev.class = &regulator_class;
a5766f11 3975 rdev->dev.parent = dev;
72dca06f 3976 dev_set_name(&rdev->dev, "regulator.%lu",
39138818 3977 (unsigned long) atomic_inc_return(&regulator_no));
a5766f11 3978
74f544c1 3979 /* set regulator constraints */
9a8f5e07
MB		 3980 if (init_data)
3981 constraints = &init_data->constraints;
3982
3983 ret = set_machine_constraints(rdev, constraints);
74f544c1 3984 if (ret < 0)
469b640e
BB		 3985 goto wash;
3986
9a8f5e07 3987 if (init_data && init_data->supply_regulator)
6261b06d 3988 rdev->supply_name = init_data->supply_regulator;
69511a45 3989 else if (regulator_desc->supply_name)
6261b06d 3990 rdev->supply_name = regulator_desc->supply_name;
0178f3e2 3991
a5766f11 3992 /* add consumers devices */
9a8f5e07
MB		 3993 if (init_data) {
3994 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3995 ret = set_consumer_device_supply(rdev,
9a8f5e07 3996 init_data->consumer_supplies[i].dev_name,
23c2f041 3997 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 3998 if (ret < 0) {
3999 dev_err(dev, "Failed to set supply %s\n",
4000 init_data->consumer_supplies[i].supply);
4001 goto unset_supplies;
4002 }
23c2f041 4003 }
414c70cb 4004 }
a5766f11 4005
a2151374 4006 mutex_unlock(&regulator_list_mutex);
5e3ca2b3 4007
c438b9d0
JH		 4008 ret = device_register(&rdev->dev);
4009 if (ret != 0) {
4010 put_device(&rdev->dev);
4011 goto unset_supplies;
4012 }
4013
4014 dev_set_drvdata(&rdev->dev, rdev);
4015 rdev_init_debugfs(rdev);
4016
5e3ca2b3
JMC		 4017 /* try to resolve regulators supply since a new one was registered */
4018 class_for_each_device(&regulator_class, NULL, NULL,
4019 regulator_register_resolve_supply);
1b3de223 4020 kfree(config);
414c70cb 4021 return rdev;
4fca9545 4022
d4033b54
JN		 4023unset_supplies:
4024 unset_regulator_supplies(rdev);
32165230 4025wash:
469b640e 4026 kfree(rdev->constraints);
32165230 4027 regulator_ena_gpio_free(rdev);
4fca9545
DB		 4028clean:
4029 kfree(rdev);
a2151374
JH		 4030 mutex_unlock(&regulator_list_mutex);
4031 kfree(config);
4032 return ERR_PTR(ret);
414c70cb
LG		 4033}
4034EXPORT_SYMBOL_GPL(regulator_register);
4035
4036/**
4037 * regulator_unregister - unregister regulator
69279fb9 4038 * @rdev: regulator to unregister
414c70cb
LG		 4039 *
4040 * Called by regulator drivers to unregister a regulator.
4041 */
4042void regulator_unregister(struct regulator_dev *rdev)
4043{
4044 if (rdev == NULL)
4045 return;
4046
891636ea
MB		 4047 if (rdev->supply) {
4048 while (rdev->use_count--)
4049 regulator_disable(rdev->supply);
e032b376 4050 regulator_put(rdev->supply);
891636ea 4051 }
414c70cb 4052 mutex_lock(&regulator_list_mutex);
1130e5b3 4053 debugfs_remove_recursive(rdev->debugfs);
43829731 4054 flush_work(&rdev->disable_work.work);
6bf87d17 4055 WARN_ON(rdev->open_count);
0f1d747b 4056 unset_regulator_supplies(rdev);
414c70cb 4057 list_del(&rdev->list);
7cd71c3b 4058 mutex_unlock(&regulator_list_mutex);
f19b00da 4059 regulator_ena_gpio_free(rdev);
58fb5cf5 4060 device_unregister(&rdev->dev);
414c70cb
LG		 4061}
4062EXPORT_SYMBOL_GPL(regulator_unregister);
4063
85f3b431
TV		 4064static int _regulator_suspend_prepare(struct device *dev, void *data)
4065{
4066 struct regulator_dev *rdev = dev_to_rdev(dev);
4067 const suspend_state_t *state = data;
4068 int ret;
4069
4070 mutex_lock(&rdev->mutex);
4071 ret = suspend_prepare(rdev, *state);
4072 mutex_unlock(&rdev->mutex);
4073
4074 return ret;
4075}
4076
414c70cb 4077/**
cf7bbcdf 4078 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 4079 * @state: system suspend state
4080 *
4081 * Configure each regulator with it's suspend operating parameters for state.
4082 * This will usually be called by machine suspend code prior to supending.
4083 */
4084int regulator_suspend_prepare(suspend_state_t state)
4085{
414c70cb
LG		 4086 /* ON is handled by regulator active state */
4087 if (state == PM_SUSPEND_ON)
4088 return -EINVAL;
4089
85f3b431
TV		 4090 return class_for_each_device(&regulator_class, NULL, &state,
4091 _regulator_suspend_prepare);
4092}
4093EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
414c70cb 4094
85f3b431
TV		 4095static int _regulator_suspend_finish(struct device *dev, void *data)
4096{
4097 struct regulator_dev *rdev = dev_to_rdev(dev);
4098 int ret;
414c70cb 4099
85f3b431
TV		 4100 mutex_lock(&rdev->mutex);
4101 if (rdev->use_count > 0 || rdev->constraints->always_on) {
4102 if (!_regulator_is_enabled(rdev)) {
4103 ret = _regulator_do_enable(rdev);
4104 if (ret)
4105 dev_err(dev,
4106 "Failed to resume regulator %d\n",
4107 ret);
414c70cb 4108 }
85f3b431
TV		 4109 } else {
4110 if (!have_full_constraints())
4111 goto unlock;
4112 if (!_regulator_is_enabled(rdev))
4113 goto unlock;
4114
4115 ret = _regulator_do_disable(rdev);
4116 if (ret)
4117 dev_err(dev, "Failed to suspend regulator %d\n", ret);
414c70cb 4118 }
85f3b431
TV		 4119unlock:
4120 mutex_unlock(&rdev->mutex);
4121
4122 /* Keep processing regulators in spite of any errors */
4123 return 0;
414c70cb 4124}
414c70cb 4125
7a32b589
MH		 4126/**
4127 * regulator_suspend_finish - resume regulators from system wide suspend
4128 *
4129 * Turn on regulators that might be turned off by regulator_suspend_prepare
4130 * and that should be turned on according to the regulators properties.
4131 */
4132int regulator_suspend_finish(void)
4133{
85f3b431
TV		 4134 return class_for_each_device(&regulator_class, NULL, NULL,
4135 _regulator_suspend_finish);
7a32b589
MH		 4136}
4137EXPORT_SYMBOL_GPL(regulator_suspend_finish);
4138
ca725561
MB		 4139/**
4140 * regulator_has_full_constraints - the system has fully specified constraints
4141 *
4142 * Calling this function will cause the regulator API to disable all
4143 * regulators which have a zero use count and don't have an always_on
4144 * constraint in a late_initcall.
4145 *
4146 * The intention is that this will become the default behaviour in a
4147 * future kernel release so users are encouraged to use this facility
4148 * now.
4149 */
4150void regulator_has_full_constraints(void)
4151{
4152 has_full_constraints = 1;
4153}
4154EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4155
414c70cb
LG		 4156/**
4157 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 4158 * @rdev: regulator
414c70cb
LG		 4159 *
4160 * Get rdev regulator driver private data. This call can be used in the
4161 * regulator driver context.
4162 */
4163void *rdev_get_drvdata(struct regulator_dev *rdev)
4164{
4165 return rdev->reg_data;
4166}
4167EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4168
4169/**
4170 * regulator_get_drvdata - get regulator driver data
4171 * @regulator: regulator
4172 *
4173 * Get regulator driver private data. This call can be used in the consumer
4174 * driver context when non API regulator specific functions need to be called.
4175 */
4176void *regulator_get_drvdata(struct regulator *regulator)
4177{
4178 return regulator->rdev->reg_data;
4179}
4180EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4181
4182/**
4183 * regulator_set_drvdata - set regulator driver data
4184 * @regulator: regulator
4185 * @data: data
4186 */
4187void regulator_set_drvdata(struct regulator *regulator, void *data)
4188{
4189 regulator->rdev->reg_data = data;
4190}
4191EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4192
4193/**
4194 * regulator_get_id - get regulator ID
69279fb9 4195 * @rdev: regulator
414c70cb
LG		 4196 */
4197int rdev_get_id(struct regulator_dev *rdev)
4198{
4199 return rdev->desc->id;
4200}
4201EXPORT_SYMBOL_GPL(rdev_get_id);
4202
a5766f11
LG		 4203struct device *rdev_get_dev(struct regulator_dev *rdev)
4204{
4205 return &rdev->dev;
4206}
4207EXPORT_SYMBOL_GPL(rdev_get_dev);
4208
4209void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4210{
4211 return reg_init_data->driver_data;
4212}
4213EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4214
ba55a974
MB		 4215#ifdef CONFIG_DEBUG_FS
4216static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
4217 size_t count, loff_t *ppos)
4218{
4219 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
4220 ssize_t len, ret = 0;
4221 struct regulator_map *map;
4222
4223 if (!buf)
4224 return -ENOMEM;
4225
4226 list_for_each_entry(map, &regulator_map_list, list) {
4227 len = snprintf(buf + ret, PAGE_SIZE - ret,
4228 "%s -> %s.%s\n",
4229 rdev_get_name(map->regulator), map->dev_name,
4230 map->supply);
4231 if (len >= 0)
4232 ret += len;
4233 if (ret > PAGE_SIZE) {
4234 ret = PAGE_SIZE;
4235 break;
4236 }
4237 }
4238
4239 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
4240
4241 kfree(buf);
4242
4243 return ret;
4244}
24751434 4245#endif
ba55a974
MB		 4246
4247static const struct file_operations supply_map_fops = {
24751434 4248#ifdef CONFIG_DEBUG_FS
ba55a974
MB		 4249 .read = supply_map_read_file,
4250 .llseek = default_llseek,
ba55a974 4251#endif
24751434 4252};
ba55a974 4253
7c225ec9 4254#ifdef CONFIG_DEBUG_FS
85f3b431
TV		 4255struct summary_data {
4256 struct seq_file *s;
4257 struct regulator_dev *parent;
4258 int level;
4259};
4260
4261static void regulator_summary_show_subtree(struct seq_file *s,
4262 struct regulator_dev *rdev,
4263 int level);
4264
4265static int regulator_summary_show_children(struct device *dev, void *data)
4266{
4267 struct regulator_dev *rdev = dev_to_rdev(dev);
4268 struct summary_data *summary_data = data;
4269
4270 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
4271 regulator_summary_show_subtree(summary_data->s, rdev,
4272 summary_data->level + 1);
4273
4274 return 0;
4275}
4276
7c225ec9
HS		 4277static void regulator_summary_show_subtree(struct seq_file *s,
4278 struct regulator_dev *rdev,
4279 int level)
4280{
7c225ec9
HS		 4281 struct regulation_constraints *c;
4282 struct regulator *consumer;
85f3b431 4283 struct summary_data summary_data;
7c225ec9
HS		 4284
4285 if (!rdev)
4286 return;
4287
7c225ec9
HS		 4288 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4289 level * 3 + 1, "",
4290 30 - level * 3, rdev_get_name(rdev),
4291 rdev->use_count, rdev->open_count, rdev->bypass_count);
4292
23296099
HS		 4293 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4294 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
7c225ec9
HS		 4295
4296 c = rdev->constraints;
4297 if (c) {
4298 switch (rdev->desc->type) {
4299 case REGULATOR_VOLTAGE:
4300 seq_printf(s, "%5dmV %5dmV ",
4301 c->min_uV / 1000, c->max_uV / 1000);
4302 break;
4303 case REGULATOR_CURRENT:
4304 seq_printf(s, "%5dmA %5dmA ",
4305 c->min_uA / 1000, c->max_uA / 1000);
4306 break;
4307 }
4308 }
4309
4310 seq_puts(s, "\n");
4311
4312 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4313 if (consumer->dev->class == &regulator_class)
4314 continue;
4315
4316 seq_printf(s, "%*s%-*s ",
4317 (level + 1) * 3 + 1, "",
4318 30 - (level + 1) * 3, dev_name(consumer->dev));
4319
4320 switch (rdev->desc->type) {
4321 case REGULATOR_VOLTAGE:
23296099 4322 seq_printf(s, "%37dmV %5dmV",
7c225ec9
HS		 4323 consumer->min_uV / 1000,
4324 consumer->max_uV / 1000);
4325 break;
4326 case REGULATOR_CURRENT:
7c225ec9
HS		 4327 break;
4328 }
4329
4330 seq_puts(s, "\n");
4331 }
4332
85f3b431
TV		 4333 summary_data.s = s;
4334 summary_data.level = level;
4335 summary_data.parent = rdev;
7c225ec9 4336
85f3b431
TV		 4337 class_for_each_device(&regulator_class, NULL, &summary_data,
4338 regulator_summary_show_children);
7c225ec9
HS		 4339}
4340
85f3b431 4341static int regulator_summary_show_roots(struct device *dev, void *data)
7c225ec9 4342{
85f3b431
TV		 4343 struct regulator_dev *rdev = dev_to_rdev(dev);
4344 struct seq_file *s = data;
7c225ec9 4345
85f3b431
TV		 4346 if (!rdev->supply)
4347 regulator_summary_show_subtree(s, rdev, 0);
7c225ec9 4348
85f3b431
TV		 4349 return 0;
4350}
7c225ec9 4351
85f3b431
TV		 4352static int regulator_summary_show(struct seq_file *s, void *data)
4353{
4354 seq_puts(s, " regulator use open bypass voltage current min max\n");
4355 seq_puts(s, "-------------------------------------------------------------------------------\n");
7c225ec9 4356
85f3b431
TV		 4357 class_for_each_device(&regulator_class, NULL, s,
4358 regulator_summary_show_roots);
7c225ec9
HS		 4359
4360 return 0;
4361}
4362
4363static int regulator_summary_open(struct inode *inode, struct file *file)
4364{
4365 return single_open(file, regulator_summary_show, inode->i_private);
4366}
4367#endif
4368
4369static const struct file_operations regulator_summary_fops = {
4370#ifdef CONFIG_DEBUG_FS
4371 .open = regulator_summary_open,
4372 .read = seq_read,
4373 .llseek = seq_lseek,
4374 .release = single_release,
4375#endif
4376};
4377
414c70cb
LG		 4378static int __init regulator_init(void)
4379{
34abbd68
MB		 4380 int ret;
4381
34abbd68
MB		 4382 ret = class_register(&regulator_class);
4383
1130e5b3 4384 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 4385 if (!debugfs_root)
1130e5b3 4386 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 4387
f4d562c6
MB		 4388 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4389 &supply_map_fops);
1130e5b3 4390
7c225ec9 4391 debugfs_create_file("regulator_summary", 0444, debugfs_root,
85f3b431 4392 NULL, &regulator_summary_fops);
7c225ec9 4393
34abbd68
MB		 4394 regulator_dummy_init();
4395
4396 return ret;
414c70cb
LG		 4397}
4398
4399/* init early to allow our consumers to complete system booting */
4400core_initcall(regulator_init);
ca725561 4401
609ca5f3 4402static int __init regulator_late_cleanup(struct device *dev, void *data)
ca725561 4403{
609ca5f3
MB		 4404 struct regulator_dev *rdev = dev_to_rdev(dev);
4405 const struct regulator_ops *ops = rdev->desc->ops;
4406 struct regulation_constraints *c = rdev->constraints;
ca725561 4407 int enabled, ret;
ca725561 4408
609ca5f3
MB		 4409 if (c && c->always_on)
4410 return 0;
4411
4412 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
4413 return 0;
4414
4415 mutex_lock(&rdev->mutex);
4416
4417 if (rdev->use_count)
4418 goto unlock;
4419
4420 /* If we can't read the status assume it's on. */
4421 if (ops->is_enabled)
4422 enabled = ops->is_enabled(rdev);
4423 else
4424 enabled = 1;
4425
4426 if (!enabled)
4427 goto unlock;
4428
4429 if (have_full_constraints()) {
4430 /* We log since this may kill the system if it goes
4431 * wrong. */
4432 rdev_info(rdev, "disabling\n");
4433 ret = _regulator_do_disable(rdev);
4434 if (ret != 0)
4435 rdev_err(rdev, "couldn't disable: %d\n", ret);
4436 } else {
4437 /* The intention is that in future we will
4438 * assume that full constraints are provided
4439 * so warn even if we aren't going to do
4440 * anything here.
4441 */
4442 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4443 }
4444
4445unlock:
4446 mutex_unlock(&rdev->mutex);
4447
4448 return 0;
4449}
4450
4451static int __init regulator_init_complete(void)
4452{
86f5fcfc
MB		 4453 /*
4454 * Since DT doesn't provide an idiomatic mechanism for
4455 * enabling full constraints and since it's much more natural
4456 * with DT to provide them just assume that a DT enabled
4457 * system has full constraints.
4458 */
4459 if (of_have_populated_dt())
4460 has_full_constraints = true;
4461
ca725561 4462 /* If we have a full configuration then disable any regulators
e9535834
MB		 4463 * we have permission to change the status for and which are
4464 * not in use or always_on. This is effectively the default
4465 * for DT and ACPI as they have full constraints.
ca725561 4466 */
609ca5f3
MB		 4467 class_for_each_device(&regulator_class, NULL, NULL,
4468 regulator_late_cleanup);
ca725561
MB		 4469
4470 return 0;
4471}
fd482a3e 4472late_initcall_sync(regulator_init_complete);
Linux 6.x block layer and io_uring tree(s)