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regulator: max8998: Convert to set_voltage_sel and regulator_map_voltage_linear
[linux-block.git] / drivers / regulator / core.c
CommitLineData
414c70cb
LG		 1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
a5766f11 5 * Copyright 2008 SlimLogic Ltd.
414c70cb 6 *
a5766f11 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
414c70cb
LG		 8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
1130e5b3 18#include <linux/debugfs.h>
414c70cb 19#include <linux/device.h>
5a0e3ad6 20#include <linux/slab.h>
f21e0e81 21#include <linux/async.h>
414c70cb
LG		 22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
31aae2be 25#include <linux/delay.h>
69511a45 26#include <linux/of.h>
65b19ce6 27#include <linux/regmap.h>
69511a45 28#include <linux/regulator/of_regulator.h>
414c70cb
LG		 29#include <linux/regulator/consumer.h>
30#include <linux/regulator/driver.h>
31#include <linux/regulator/machine.h>
65602c32 32#include <linux/module.h>
414c70cb 33
02fa3ec0
MB		 34#define CREATE_TRACE_POINTS
35#include <trace/events/regulator.h>
36
34abbd68
MB		 37#include "dummy.h"
38
7d51a0db
MB		 39#define rdev_crit(rdev, fmt, ...) \
40 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
5da84fd9
JP		 41#define rdev_err(rdev, fmt, ...) \
42 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
43#define rdev_warn(rdev, fmt, ...) \
44 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
45#define rdev_info(rdev, fmt, ...) \
46 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
47#define rdev_dbg(rdev, fmt, ...) \
48 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
49
414c70cb
LG		 50static DEFINE_MUTEX(regulator_list_mutex);
51static LIST_HEAD(regulator_list);
52static LIST_HEAD(regulator_map_list);
21cf891a 53static bool has_full_constraints;
688fe99a 54static bool board_wants_dummy_regulator;
414c70cb 55
1130e5b3 56static struct dentry *debugfs_root;
1130e5b3 57
8dc5390d 58/*
414c70cb
LG		 59 * struct regulator_map
60 *
61 * Used to provide symbolic supply names to devices.
62 */
63struct regulator_map {
64 struct list_head list;
40f9244f 65 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 66 const char *supply;
a5766f11 67 struct regulator_dev *regulator;
414c70cb
LG		 68};
69
414c70cb
LG		 70/*
71 * struct regulator
72 *
73 * One for each consumer device.
74 */
75struct regulator {
76 struct device *dev;
77 struct list_head list;
6492bc1b 78 unsigned int always_on:1;
414c70cb
LG		 79 int uA_load;
80 int min_uV;
81 int max_uV;
414c70cb
LG		 82 char *supply_name;
83 struct device_attribute dev_attr;
84 struct regulator_dev *rdev;
5de70519 85 struct dentry *debugfs;
414c70cb
LG		 86};
87
88static int _regulator_is_enabled(struct regulator_dev *rdev);
3801b86a 89static int _regulator_disable(struct regulator_dev *rdev);
414c70cb
LG		 90static int _regulator_get_voltage(struct regulator_dev *rdev);
91static int _regulator_get_current_limit(struct regulator_dev *rdev);
92static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
93static void _notifier_call_chain(struct regulator_dev *rdev,
94 unsigned long event, void *data);
75790251
MB		 95static int _regulator_do_set_voltage(struct regulator_dev *rdev,
96 int min_uV, int max_uV);
3801b86a
MB		 97static struct regulator *create_regulator(struct regulator_dev *rdev,
98 struct device *dev,
99 const char *supply_name);
414c70cb 100
1083c393
MB		 101static const char *rdev_get_name(struct regulator_dev *rdev)
102{
103 if (rdev->constraints && rdev->constraints->name)
104 return rdev->constraints->name;
105 else if (rdev->desc->name)
106 return rdev->desc->name;
107 else
108 return "";
109}
110
414c70cb
LG		 111/* gets the regulator for a given consumer device */
112static struct regulator *get_device_regulator(struct device *dev)
113{
114 struct regulator *regulator = NULL;
115 struct regulator_dev *rdev;
116
117 mutex_lock(&regulator_list_mutex);
118 list_for_each_entry(rdev, &regulator_list, list) {
119 mutex_lock(&rdev->mutex);
120 list_for_each_entry(regulator, &rdev->consumer_list, list) {
121 if (regulator->dev == dev) {
122 mutex_unlock(&rdev->mutex);
123 mutex_unlock(&regulator_list_mutex);
124 return regulator;
125 }
126 }
127 mutex_unlock(&rdev->mutex);
128 }
129 mutex_unlock(&regulator_list_mutex);
130 return NULL;
131}
132
69511a45
RN		 133/**
134 * of_get_regulator - get a regulator device node based on supply name
135 * @dev: Device pointer for the consumer (of regulator) device
136 * @supply: regulator supply name
137 *
138 * Extract the regulator device node corresponding to the supply name.
139 * retruns the device node corresponding to the regulator if found, else
140 * returns NULL.
141 */
142static struct device_node *of_get_regulator(struct device *dev, const char *supply)
143{
144 struct device_node *regnode = NULL;
145 char prop_name[32]; /* 32 is max size of property name */
146
147 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
148
149 snprintf(prop_name, 32, "%s-supply", supply);
150 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
151
152 if (!regnode) {
16fbcc3b 153 dev_dbg(dev, "Looking up %s property in node %s failed",
69511a45
RN		 154 prop_name, dev->of_node->full_name);
155 return NULL;
156 }
157 return regnode;
158}
159
6492bc1b
MB		 160static int _regulator_can_change_status(struct regulator_dev *rdev)
161{
162 if (!rdev->constraints)
163 return 0;
164
165 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
166 return 1;
167 else
168 return 0;
169}
170
414c70cb
LG		 171/* Platform voltage constraint check */
172static int regulator_check_voltage(struct regulator_dev *rdev,
173 int *min_uV, int *max_uV)
174{
175 BUG_ON(*min_uV > *max_uV);
176
177 if (!rdev->constraints) {
5da84fd9 178 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 179 return -ENODEV;
180 }
181 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
5da84fd9 182 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 183 return -EPERM;
184 }
185
186 if (*max_uV > rdev->constraints->max_uV)
187 *max_uV = rdev->constraints->max_uV;
188 if (*min_uV < rdev->constraints->min_uV)
189 *min_uV = rdev->constraints->min_uV;
190
89f425ed
MB		 191 if (*min_uV > *max_uV) {
192 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 193 *min_uV, *max_uV);
414c70cb 194 return -EINVAL;
89f425ed 195 }
414c70cb
LG		 196
197 return 0;
198}
199
05fda3b1
TP		 200/* Make sure we select a voltage that suits the needs of all
201 * regulator consumers
202 */
203static int regulator_check_consumers(struct regulator_dev *rdev,
204 int *min_uV, int *max_uV)
205{
206 struct regulator *regulator;
207
208 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4aa922c0
MB		 209 /*
210 * Assume consumers that didn't say anything are OK
211 * with anything in the constraint range.
212 */
213 if (!regulator->min_uV && !regulator->max_uV)
214 continue;
215
05fda3b1
TP		 216 if (*max_uV > regulator->max_uV)
217 *max_uV = regulator->max_uV;
218 if (*min_uV < regulator->min_uV)
219 *min_uV = regulator->min_uV;
220 }
221
222 if (*min_uV > *max_uV)
223 return -EINVAL;
224
225 return 0;
226}
227
414c70cb
LG		 228/* current constraint check */
229static int regulator_check_current_limit(struct regulator_dev *rdev,
230 int *min_uA, int *max_uA)
231{
232 BUG_ON(*min_uA > *max_uA);
233
234 if (!rdev->constraints) {
5da84fd9 235 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 236 return -ENODEV;
237 }
238 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
5da84fd9 239 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 240 return -EPERM;
241 }
242
243 if (*max_uA > rdev->constraints->max_uA)
244 *max_uA = rdev->constraints->max_uA;
245 if (*min_uA < rdev->constraints->min_uA)
246 *min_uA = rdev->constraints->min_uA;
247
89f425ed
MB		 248 if (*min_uA > *max_uA) {
249 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 250 *min_uA, *max_uA);
414c70cb 251 return -EINVAL;
89f425ed 252 }
414c70cb
LG		 253
254 return 0;
255}
256
257/* operating mode constraint check */
2c608234 258static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 259{
2c608234 260 switch (*mode) {
e573520b
DB		 261 case REGULATOR_MODE_FAST:
262 case REGULATOR_MODE_NORMAL:
263 case REGULATOR_MODE_IDLE:
264 case REGULATOR_MODE_STANDBY:
265 break;
266 default:
89f425ed 267 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 268 return -EINVAL;
269 }
270
414c70cb 271 if (!rdev->constraints) {
5da84fd9 272 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 273 return -ENODEV;
274 }
275 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
5da84fd9 276 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 277 return -EPERM;
278 }
2c608234
MB		 279
280 /* The modes are bitmasks, the most power hungry modes having
281 * the lowest values. If the requested mode isn't supported
282 * try higher modes. */
283 while (*mode) {
284 if (rdev->constraints->valid_modes_mask & *mode)
285 return 0;
286 *mode /= 2;
414c70cb 287 }
2c608234
MB		 288
289 return -EINVAL;
414c70cb
LG		 290}
291
292/* dynamic regulator mode switching constraint check */
293static int regulator_check_drms(struct regulator_dev *rdev)
294{
295 if (!rdev->constraints) {
5da84fd9 296 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 297 return -ENODEV;
298 }
299 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
5da84fd9 300 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 301 return -EPERM;
302 }
303 return 0;
304}
305
306static ssize_t device_requested_uA_show(struct device *dev,
307 struct device_attribute *attr, char *buf)
308{
309 struct regulator *regulator;
310
311 regulator = get_device_regulator(dev);
312 if (regulator == NULL)
313 return 0;
314
315 return sprintf(buf, "%d\n", regulator->uA_load);
316}
317
318static ssize_t regulator_uV_show(struct device *dev,
319 struct device_attribute *attr, char *buf)
320{
a5766f11 321 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 322 ssize_t ret;
323
324 mutex_lock(&rdev->mutex);
325 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
326 mutex_unlock(&rdev->mutex);
327
328 return ret;
329}
7ad68e2f 330static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 331
332static ssize_t regulator_uA_show(struct device *dev,
333 struct device_attribute *attr, char *buf)
334{
a5766f11 335 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 336
337 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
338}
7ad68e2f 339static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 340
bc558a60
MB		 341static ssize_t regulator_name_show(struct device *dev,
342 struct device_attribute *attr, char *buf)
343{
344 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 345
1083c393 346 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60
MB		 347}
348
4fca9545 349static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 350{
414c70cb
LG		 351 switch (mode) {
352 case REGULATOR_MODE_FAST:
353 return sprintf(buf, "fast\n");
354 case REGULATOR_MODE_NORMAL:
355 return sprintf(buf, "normal\n");
356 case REGULATOR_MODE_IDLE:
357 return sprintf(buf, "idle\n");
358 case REGULATOR_MODE_STANDBY:
359 return sprintf(buf, "standby\n");
360 }
361 return sprintf(buf, "unknown\n");
362}
363
4fca9545
DB		 364static ssize_t regulator_opmode_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
414c70cb 366{
a5766f11 367 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 368
4fca9545
DB		 369 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
370}
7ad68e2f 371static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 372
373static ssize_t regulator_print_state(char *buf, int state)
374{
414c70cb
LG		 375 if (state > 0)
376 return sprintf(buf, "enabled\n");
377 else if (state == 0)
378 return sprintf(buf, "disabled\n");
379 else
380 return sprintf(buf, "unknown\n");
381}
382
4fca9545
DB		 383static ssize_t regulator_state_show(struct device *dev,
384 struct device_attribute *attr, char *buf)
385{
386 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 387 ssize_t ret;
388
389 mutex_lock(&rdev->mutex);
390 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
391 mutex_unlock(&rdev->mutex);
4fca9545 392
9332546f 393 return ret;
4fca9545 394}
7ad68e2f 395static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 396
853116a1
DB		 397static ssize_t regulator_status_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
399{
400 struct regulator_dev *rdev = dev_get_drvdata(dev);
401 int status;
402 char *label;
403
404 status = rdev->desc->ops->get_status(rdev);
405 if (status < 0)
406 return status;
407
408 switch (status) {
409 case REGULATOR_STATUS_OFF:
410 label = "off";
411 break;
412 case REGULATOR_STATUS_ON:
413 label = "on";
414 break;
415 case REGULATOR_STATUS_ERROR:
416 label = "error";
417 break;
418 case REGULATOR_STATUS_FAST:
419 label = "fast";
420 break;
421 case REGULATOR_STATUS_NORMAL:
422 label = "normal";
423 break;
424 case REGULATOR_STATUS_IDLE:
425 label = "idle";
426 break;
427 case REGULATOR_STATUS_STANDBY:
428 label = "standby";
429 break;
430 default:
431 return -ERANGE;
432 }
433
434 return sprintf(buf, "%s\n", label);
435}
436static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
437
414c70cb
LG		 438static ssize_t regulator_min_uA_show(struct device *dev,
439 struct device_attribute *attr, char *buf)
440{
a5766f11 441 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 442
443 if (!rdev->constraints)
444 return sprintf(buf, "constraint not defined\n");
445
446 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
447}
7ad68e2f 448static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 449
450static ssize_t regulator_max_uA_show(struct device *dev,
451 struct device_attribute *attr, char *buf)
452{
a5766f11 453 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 454
455 if (!rdev->constraints)
456 return sprintf(buf, "constraint not defined\n");
457
458 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
459}
7ad68e2f 460static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 461
462static ssize_t regulator_min_uV_show(struct device *dev,
463 struct device_attribute *attr, char *buf)
464{
a5766f11 465 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 466
467 if (!rdev->constraints)
468 return sprintf(buf, "constraint not defined\n");
469
470 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
471}
7ad68e2f 472static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 473
474static ssize_t regulator_max_uV_show(struct device *dev,
475 struct device_attribute *attr, char *buf)
476{
a5766f11 477 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 478
479 if (!rdev->constraints)
480 return sprintf(buf, "constraint not defined\n");
481
482 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
483}
7ad68e2f 484static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 485
486static ssize_t regulator_total_uA_show(struct device *dev,
487 struct device_attribute *attr, char *buf)
488{
a5766f11 489 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 490 struct regulator *regulator;
491 int uA = 0;
492
493 mutex_lock(&rdev->mutex);
494 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 495 uA += regulator->uA_load;
414c70cb
LG		 496 mutex_unlock(&rdev->mutex);
497 return sprintf(buf, "%d\n", uA);
498}
7ad68e2f 499static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb
LG		 500
501static ssize_t regulator_num_users_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
503{
a5766f11 504 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 505 return sprintf(buf, "%d\n", rdev->use_count);
506}
507
508static ssize_t regulator_type_show(struct device *dev,
509 struct device_attribute *attr, char *buf)
510{
a5766f11 511 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 512
513 switch (rdev->desc->type) {
514 case REGULATOR_VOLTAGE:
515 return sprintf(buf, "voltage\n");
516 case REGULATOR_CURRENT:
517 return sprintf(buf, "current\n");
518 }
519 return sprintf(buf, "unknown\n");
520}
521
522static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
523 struct device_attribute *attr, char *buf)
524{
a5766f11 525 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 526
414c70cb
LG		 527 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
528}
7ad68e2f
DB		 529static DEVICE_ATTR(suspend_mem_microvolts, 0444,
530 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 531
532static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
533 struct device_attribute *attr, char *buf)
534{
a5766f11 535 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 536
414c70cb
LG		 537 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
538}
7ad68e2f
DB		 539static DEVICE_ATTR(suspend_disk_microvolts, 0444,
540 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 541
542static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
543 struct device_attribute *attr, char *buf)
544{
a5766f11 545 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 546
414c70cb
LG		 547 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
548}
7ad68e2f
DB		 549static DEVICE_ATTR(suspend_standby_microvolts, 0444,
550 regulator_suspend_standby_uV_show, NULL);
414c70cb 551
414c70cb
LG		 552static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
553 struct device_attribute *attr, char *buf)
554{
a5766f11 555 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 556
4fca9545
DB		 557 return regulator_print_opmode(buf,
558 rdev->constraints->state_mem.mode);
414c70cb 559}
7ad68e2f
DB		 560static DEVICE_ATTR(suspend_mem_mode, 0444,
561 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 562
563static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
564 struct device_attribute *attr, char *buf)
565{
a5766f11 566 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 567
4fca9545
DB		 568 return regulator_print_opmode(buf,
569 rdev->constraints->state_disk.mode);
414c70cb 570}
7ad68e2f
DB		 571static DEVICE_ATTR(suspend_disk_mode, 0444,
572 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 573
574static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
575 struct device_attribute *attr, char *buf)
576{
a5766f11 577 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 578
4fca9545
DB		 579 return regulator_print_opmode(buf,
580 rdev->constraints->state_standby.mode);
414c70cb 581}
7ad68e2f
DB		 582static DEVICE_ATTR(suspend_standby_mode, 0444,
583 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 584
585static ssize_t regulator_suspend_mem_state_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
587{
a5766f11 588 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 589
4fca9545
DB		 590 return regulator_print_state(buf,
591 rdev->constraints->state_mem.enabled);
414c70cb 592}
7ad68e2f
DB		 593static DEVICE_ATTR(suspend_mem_state, 0444,
594 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 595
596static ssize_t regulator_suspend_disk_state_show(struct device *dev,
597 struct device_attribute *attr, char *buf)
598{
a5766f11 599 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 600
4fca9545
DB		 601 return regulator_print_state(buf,
602 rdev->constraints->state_disk.enabled);
414c70cb 603}
7ad68e2f
DB		 604static DEVICE_ATTR(suspend_disk_state, 0444,
605 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 606
607static ssize_t regulator_suspend_standby_state_show(struct device *dev,
608 struct device_attribute *attr, char *buf)
609{
a5766f11 610 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 611
4fca9545
DB		 612 return regulator_print_state(buf,
613 rdev->constraints->state_standby.enabled);
414c70cb 614}
7ad68e2f
DB		 615static DEVICE_ATTR(suspend_standby_state, 0444,
616 regulator_suspend_standby_state_show, NULL);
617
bc558a60 618
7ad68e2f
DB		 619/*
620 * These are the only attributes are present for all regulators.
621 * Other attributes are a function of regulator functionality.
622 */
414c70cb 623static struct device_attribute regulator_dev_attrs[] = {
bc558a60 624 __ATTR(name, 0444, regulator_name_show, NULL),
414c70cb
LG		 625 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
626 __ATTR(type, 0444, regulator_type_show, NULL),
414c70cb
LG		 627 __ATTR_NULL,
628};
629
630static void regulator_dev_release(struct device *dev)
631{
a5766f11 632 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 633 kfree(rdev);
634}
635
636static struct class regulator_class = {
637 .name = "regulator",
638 .dev_release = regulator_dev_release,
639 .dev_attrs = regulator_dev_attrs,
640};
641
642/* Calculate the new optimum regulator operating mode based on the new total
643 * consumer load. All locks held by caller */
644static void drms_uA_update(struct regulator_dev *rdev)
645{
646 struct regulator *sibling;
647 int current_uA = 0, output_uV, input_uV, err;
648 unsigned int mode;
649
650 err = regulator_check_drms(rdev);
651 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
476c2d83
MB		 652 (!rdev->desc->ops->get_voltage &&
653 !rdev->desc->ops->get_voltage_sel) ||
654 !rdev->desc->ops->set_mode)
036de8ef 655 return;
414c70cb
LG		 656
657 /* get output voltage */
1bf5a1f8 658 output_uV = _regulator_get_voltage(rdev);
414c70cb
LG		 659 if (output_uV <= 0)
660 return;
661
662 /* get input voltage */
1bf5a1f8
MB		 663 input_uV = 0;
664 if (rdev->supply)
3f24f5ad 665 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 666 if (input_uV <= 0)
414c70cb
LG		 667 input_uV = rdev->constraints->input_uV;
668 if (input_uV <= 0)
669 return;
670
671 /* calc total requested load */
672 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 673 current_uA += sibling->uA_load;
414c70cb
LG		 674
675 /* now get the optimum mode for our new total regulator load */
676 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
677 output_uV, current_uA);
678
679 /* check the new mode is allowed */
2c608234 680 err = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 681 if (err == 0)
682 rdev->desc->ops->set_mode(rdev, mode);
683}
684
685static int suspend_set_state(struct regulator_dev *rdev,
686 struct regulator_state *rstate)
687{
688 int ret = 0;
638f85c5
MB		 689
690 /* If we have no suspend mode configration don't set anything;
8ac0e95d
AL		 691 * only warn if the driver implements set_suspend_voltage or
692 * set_suspend_mode callback.
638f85c5
MB		 693 */
694 if (!rstate->enabled && !rstate->disabled) {
8ac0e95d
AL		 695 if (rdev->desc->ops->set_suspend_voltage ||
696 rdev->desc->ops->set_suspend_mode)
5da84fd9 697 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 698 return 0;
699 }
700
701 if (rstate->enabled && rstate->disabled) {
5da84fd9 702 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 703 return -EINVAL;
704 }
414c70cb 705
8ac0e95d 706 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
414c70cb 707 ret = rdev->desc->ops->set_suspend_enable(rdev);
8ac0e95d 708 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
414c70cb 709 ret = rdev->desc->ops->set_suspend_disable(rdev);
8ac0e95d
AL		 710 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
711 ret = 0;
712
414c70cb 713 if (ret < 0) {
5da84fd9 714 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 715 return ret;
716 }
717
718 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
719 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
720 if (ret < 0) {
5da84fd9 721 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 722 return ret;
723 }
724 }
725
726 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
727 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
728 if (ret < 0) {
5da84fd9 729 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 730 return ret;
731 }
732 }
733 return ret;
734}
735
736/* locks held by caller */
737static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
738{
739 if (!rdev->constraints)
740 return -EINVAL;
741
742 switch (state) {
743 case PM_SUSPEND_STANDBY:
744 return suspend_set_state(rdev,
745 &rdev->constraints->state_standby);
746 case PM_SUSPEND_MEM:
747 return suspend_set_state(rdev,
748 &rdev->constraints->state_mem);
749 case PM_SUSPEND_MAX:
750 return suspend_set_state(rdev,
751 &rdev->constraints->state_disk);
752 default:
753 return -EINVAL;
754 }
755}
756
757static void print_constraints(struct regulator_dev *rdev)
758{
759 struct regulation_constraints *constraints = rdev->constraints;
973e9a27 760 char buf[80] = "";
8f031b48
MB		 761 int count = 0;
762 int ret;
414c70cb 763
8f031b48 764 if (constraints->min_uV && constraints->max_uV) {
414c70cb 765 if (constraints->min_uV == constraints->max_uV)
8f031b48
MB		 766 count += sprintf(buf + count, "%d mV ",
767 constraints->min_uV / 1000);
414c70cb 768 else
8f031b48
MB		 769 count += sprintf(buf + count, "%d <--> %d mV ",
770 constraints->min_uV / 1000,
771 constraints->max_uV / 1000);
772 }
773
774 if (!constraints->min_uV ||
775 constraints->min_uV != constraints->max_uV) {
776 ret = _regulator_get_voltage(rdev);
777 if (ret > 0)
778 count += sprintf(buf + count, "at %d mV ", ret / 1000);
779 }
780
bf5892a8
MB		 781 if (constraints->uV_offset)
782 count += sprintf(buf, "%dmV offset ",
783 constraints->uV_offset / 1000);
784
8f031b48 785 if (constraints->min_uA && constraints->max_uA) {
414c70cb 786 if (constraints->min_uA == constraints->max_uA)
8f031b48
MB		 787 count += sprintf(buf + count, "%d mA ",
788 constraints->min_uA / 1000);
414c70cb 789 else
8f031b48
MB		 790 count += sprintf(buf + count, "%d <--> %d mA ",
791 constraints->min_uA / 1000,
792 constraints->max_uA / 1000);
793 }
794
795 if (!constraints->min_uA ||
796 constraints->min_uA != constraints->max_uA) {
797 ret = _regulator_get_current_limit(rdev);
798 if (ret > 0)
e4a6376b 799 count += sprintf(buf + count, "at %d mA ", ret / 1000);
414c70cb 800 }
8f031b48 801
414c70cb
LG		 802 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
803 count += sprintf(buf + count, "fast ");
804 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
805 count += sprintf(buf + count, "normal ");
806 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
807 count += sprintf(buf + count, "idle ");
808 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
809 count += sprintf(buf + count, "standby");
810
13ce29f8 811 rdev_info(rdev, "%s\n", buf);
4a682922
MB		 812
813 if ((constraints->min_uV != constraints->max_uV) &&
814 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
815 rdev_warn(rdev,
816 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 817}
818
e79055d6 819static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 820 struct regulation_constraints *constraints)
a5766f11 821{
e5fda26c 822 struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 823 int ret;
824
825 /* do we need to apply the constraint voltage */
826 if (rdev->constraints->apply_uV &&
75790251
MB		 827 rdev->constraints->min_uV == rdev->constraints->max_uV) {
828 ret = _regulator_do_set_voltage(rdev,
829 rdev->constraints->min_uV,
830 rdev->constraints->max_uV);
831 if (ret < 0) {
832 rdev_err(rdev, "failed to apply %duV constraint\n",
833 rdev->constraints->min_uV);
75790251
MB		 834 return ret;
835 }
af5866c9 836 }
e06f5b4f 837
4367cfdc
DB		 838 /* constrain machine-level voltage specs to fit
839 * the actual range supported by this regulator.
840 */
841 if (ops->list_voltage && rdev->desc->n_voltages) {
842 int count = rdev->desc->n_voltages;
843 int i;
844 int min_uV = INT_MAX;
845 int max_uV = INT_MIN;
846 int cmin = constraints->min_uV;
847 int cmax = constraints->max_uV;
848
3e590918
MB		 849 /* it's safe to autoconfigure fixed-voltage supplies
850 and the constraints are used by list_voltage. */
4367cfdc 851 if (count == 1 && !cmin) {
3e590918 852 cmin = 1;
4367cfdc 853 cmax = INT_MAX;
3e590918
MB		 854 constraints->min_uV = cmin;
855 constraints->max_uV = cmax;
4367cfdc
DB		 856 }
857
3e2b9abd
MB		 858 /* voltage constraints are optional */
859 if ((cmin == 0) && (cmax == 0))
e79055d6 860 return 0;
3e2b9abd 861
4367cfdc 862 /* else require explicit machine-level constraints */
3e2b9abd 863 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 864 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 865 return -EINVAL;
4367cfdc
DB		 866 }
867
868 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
869 for (i = 0; i < count; i++) {
870 int value;
871
872 value = ops->list_voltage(rdev, i);
873 if (value <= 0)
874 continue;
875
876 /* maybe adjust [min_uV..max_uV] */
877 if (value >= cmin && value < min_uV)
878 min_uV = value;
879 if (value <= cmax && value > max_uV)
880 max_uV = value;
881 }
882
883 /* final: [min_uV..max_uV] valid iff constraints valid */
884 if (max_uV < min_uV) {
5da84fd9 885 rdev_err(rdev, "unsupportable voltage constraints\n");
e79055d6 886 return -EINVAL;
4367cfdc
DB		 887 }
888
889 /* use regulator's subset of machine constraints */
890 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 891 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
892 constraints->min_uV, min_uV);
4367cfdc
DB		 893 constraints->min_uV = min_uV;
894 }
895 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 896 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
897 constraints->max_uV, max_uV);
4367cfdc
DB		 898 constraints->max_uV = max_uV;
899 }
900 }
901
e79055d6
MB		 902 return 0;
903}
904
905/**
906 * set_machine_constraints - sets regulator constraints
907 * @rdev: regulator source
908 * @constraints: constraints to apply
909 *
910 * Allows platform initialisation code to define and constrain
911 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
912 * Constraints *must* be set by platform code in order for some
913 * regulator operations to proceed i.e. set_voltage, set_current_limit,
914 * set_mode.
915 */
916static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 917 const struct regulation_constraints *constraints)
e79055d6
MB		 918{
919 int ret = 0;
e79055d6
MB		 920 struct regulator_ops *ops = rdev->desc->ops;
921
9a8f5e07
MB		 922 if (constraints)
923 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
924 GFP_KERNEL);
925 else
926 rdev->constraints = kzalloc(sizeof(*constraints),
927 GFP_KERNEL);
f8c12fe3
MB		 928 if (!rdev->constraints)
929 return -ENOMEM;
af5866c9 930
f8c12fe3 931 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6
MB		 932 if (ret != 0)
933 goto out;
934
a5766f11 935 /* do we need to setup our suspend state */
9a8f5e07 936 if (rdev->constraints->initial_state) {
f8c12fe3 937 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 938 if (ret < 0) {
5da84fd9 939 rdev_err(rdev, "failed to set suspend state\n");
e06f5b4f
MB		 940 goto out;
941 }
942 }
a5766f11 943
9a8f5e07 944 if (rdev->constraints->initial_mode) {
a308466c 945 if (!ops->set_mode) {
5da84fd9 946 rdev_err(rdev, "no set_mode operation\n");
a308466c
MB		 947 ret = -EINVAL;
948 goto out;
949 }
950
f8c12fe3 951 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 952 if (ret < 0) {
5da84fd9 953 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
a308466c
MB		 954 goto out;
955 }
956 }
957
cacf90f2
MB		 958 /* If the constraints say the regulator should be on at this point
959 * and we have control then make sure it is enabled.
960 */
f8c12fe3
MB		 961 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
962 ops->enable) {
e5fda26c
MB		 963 ret = ops->enable(rdev);
964 if (ret < 0) {
5da84fd9 965 rdev_err(rdev, "failed to enable\n");
e5fda26c
MB		 966 goto out;
967 }
968 }
969
6f0b2c69
YSB		 970 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) {
971 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
972 if (ret < 0) {
973 rdev_err(rdev, "failed to set ramp_delay\n");
974 goto out;
975 }
976 }
977
a5766f11 978 print_constraints(rdev);
1a6958e7 979 return 0;
a5766f11 980out:
1a6958e7
AL		 981 kfree(rdev->constraints);
982 rdev->constraints = NULL;
a5766f11
LG		 983 return ret;
984}
985
986/**
987 * set_supply - set regulator supply regulator
69279fb9
MB		 988 * @rdev: regulator name
989 * @supply_rdev: supply regulator name
a5766f11
LG		 990 *
991 * Called by platform initialisation code to set the supply regulator for this
992 * regulator. This ensures that a regulators supply will also be enabled by the
993 * core if it's child is enabled.
994 */
995static int set_supply(struct regulator_dev *rdev,
3801b86a 996 struct regulator_dev *supply_rdev)
a5766f11
LG		 997{
998 int err;
999
3801b86a
MB		 1000 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1001
1002 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 1003 if (rdev->supply == NULL) {
1004 err = -ENOMEM;
3801b86a 1005 return err;
a5766f11 1006 }
3801b86a
MB		 1007
1008 return 0;
a5766f11
LG		 1009}
1010
1011/**
06c63f93 1012 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 1013 * @rdev: regulator source
40f9244f 1014 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 1015 * @supply: symbolic name for supply
a5766f11
LG		 1016 *
1017 * Allows platform initialisation code to map physical regulator
1018 * sources to symbolic names for supplies for use by devices. Devices
1019 * should use these symbolic names to request regulators, avoiding the
1020 * need to provide board-specific regulator names as platform data.
1021 */
1022static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 1023 const char *consumer_dev_name,
1024 const char *supply)
a5766f11
LG		 1025{
1026 struct regulator_map *node;
9ed2099e 1027 int has_dev;
a5766f11
LG		 1028
1029 if (supply == NULL)
1030 return -EINVAL;
1031
9ed2099e
MB		 1032 if (consumer_dev_name != NULL)
1033 has_dev = 1;
1034 else
1035 has_dev = 0;
1036
6001e13c 1037 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1038 if (node->dev_name && consumer_dev_name) {
1039 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1040 continue;
1041 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1042 continue;
23b5cc2a
JN		 1043 }
1044
6001e13c
DB		 1045 if (strcmp(node->supply, supply) != 0)
1046 continue;
1047
737f360d
MB		 1048 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1049 consumer_dev_name,
1050 dev_name(&node->regulator->dev),
1051 node->regulator->desc->name,
1052 supply,
1053 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 1054 return -EBUSY;
1055 }
1056
9ed2099e 1057 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 1058 if (node == NULL)
1059 return -ENOMEM;
1060
1061 node->regulator = rdev;
a5766f11
LG		 1062 node->supply = supply;
1063
9ed2099e
MB		 1064 if (has_dev) {
1065 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1066 if (node->dev_name == NULL) {
1067 kfree(node);
1068 return -ENOMEM;
1069 }
40f9244f
MB		 1070 }
1071
a5766f11
LG		 1072 list_add(&node->list, &regulator_map_list);
1073 return 0;
1074}
1075
0f1d747b
MR		 1076static void unset_regulator_supplies(struct regulator_dev *rdev)
1077{
1078 struct regulator_map *node, *n;
1079
1080 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1081 if (rdev == node->regulator) {
1082 list_del(&node->list);
40f9244f 1083 kfree(node->dev_name);
0f1d747b 1084 kfree(node);
0f1d747b
MR		 1085 }
1086 }
1087}
1088
f5726ae3 1089#define REG_STR_SIZE 64
414c70cb
LG		 1090
1091static struct regulator *create_regulator(struct regulator_dev *rdev,
1092 struct device *dev,
1093 const char *supply_name)
1094{
1095 struct regulator *regulator;
1096 char buf[REG_STR_SIZE];
1097 int err, size;
1098
1099 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1100 if (regulator == NULL)
1101 return NULL;
1102
1103 mutex_lock(&rdev->mutex);
1104 regulator->rdev = rdev;
1105 list_add(&regulator->list, &rdev->consumer_list);
1106
1107 if (dev) {
1108 /* create a 'requested_microamps_name' sysfs entry */
e0eaedef
MB		 1109 size = scnprintf(buf, REG_STR_SIZE,
1110 "microamps_requested_%s-%s",
1111 dev_name(dev), supply_name);
414c70cb
LG		 1112 if (size >= REG_STR_SIZE)
1113 goto overflow_err;
1114
1115 regulator->dev = dev;
4f26a2ab 1116 sysfs_attr_init(&regulator->dev_attr.attr);
414c70cb
LG		 1117 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1118 if (regulator->dev_attr.attr.name == NULL)
1119 goto attr_name_err;
1120
414c70cb
LG		 1121 regulator->dev_attr.attr.mode = 0444;
1122 regulator->dev_attr.show = device_requested_uA_show;
1123 err = device_create_file(dev, &regulator->dev_attr);
1124 if (err < 0) {
5da84fd9 1125 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
414c70cb
LG		 1126 goto attr_name_err;
1127 }
1128
1129 /* also add a link to the device sysfs entry */
1130 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1131 dev->kobj.name, supply_name);
1132 if (size >= REG_STR_SIZE)
1133 goto attr_err;
1134
1135 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1136 if (regulator->supply_name == NULL)
1137 goto attr_err;
1138
1139 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1140 buf);
1141 if (err) {
5da84fd9
JP		 1142 rdev_warn(rdev, "could not add device link %s err %d\n",
1143 dev->kobj.name, err);
414c70cb
LG		 1144 goto link_name_err;
1145 }
5de70519
MB		 1146 } else {
1147 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1148 if (regulator->supply_name == NULL)
1149 goto attr_err;
1150 }
1151
5de70519
MB		 1152 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1153 rdev->debugfs);
24751434 1154 if (!regulator->debugfs) {
5de70519 1155 rdev_warn(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1156 } else {
1157 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1158 &regulator->uA_load);
1159 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1160 &regulator->min_uV);
1161 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1162 &regulator->max_uV);
414c70cb 1163 }
5de70519 1164
6492bc1b
MB		 1165 /*
1166 * Check now if the regulator is an always on regulator - if
1167 * it is then we don't need to do nearly so much work for
1168 * enable/disable calls.
1169 */
1170 if (!_regulator_can_change_status(rdev) &&
1171 _regulator_is_enabled(rdev))
1172 regulator->always_on = true;
1173
414c70cb
LG		 1174 mutex_unlock(&rdev->mutex);
1175 return regulator;
1176link_name_err:
1177 kfree(regulator->supply_name);
1178attr_err:
1179 device_remove_file(regulator->dev, &regulator->dev_attr);
1180attr_name_err:
1181 kfree(regulator->dev_attr.attr.name);
1182overflow_err:
1183 list_del(&regulator->list);
1184 kfree(regulator);
1185 mutex_unlock(&rdev->mutex);
1186 return NULL;
1187}
1188
31aae2be
MB		 1189static int _regulator_get_enable_time(struct regulator_dev *rdev)
1190{
1191 if (!rdev->desc->ops->enable_time)
1192 return 0;
1193 return rdev->desc->ops->enable_time(rdev);
1194}
1195
69511a45 1196static struct regulator_dev *regulator_dev_lookup(struct device *dev,
6d191a5f
MB		 1197 const char *supply,
1198 int *ret)
69511a45
RN		 1199{
1200 struct regulator_dev *r;
1201 struct device_node *node;
576ca436
MB		 1202 struct regulator_map *map;
1203 const char *devname = NULL;
69511a45
RN		 1204
1205 /* first do a dt based lookup */
1206 if (dev && dev->of_node) {
1207 node = of_get_regulator(dev, supply);
6d191a5f 1208 if (node) {
69511a45
RN		 1209 list_for_each_entry(r, &regulator_list, list)
1210 if (r->dev.parent &&
1211 node == r->dev.of_node)
1212 return r;
6d191a5f
MB		 1213 } else {
1214 /*
1215 * If we couldn't even get the node then it's
1216 * not just that the device didn't register
1217 * yet, there's no node and we'll never
1218 * succeed.
1219 */
1220 *ret = -ENODEV;
1221 }
69511a45
RN		 1222 }
1223
1224 /* if not found, try doing it non-dt way */
576ca436
MB		 1225 if (dev)
1226 devname = dev_name(dev);
1227
69511a45
RN		 1228 list_for_each_entry(r, &regulator_list, list)
1229 if (strcmp(rdev_get_name(r), supply) == 0)
1230 return r;
1231
576ca436
MB		 1232 list_for_each_entry(map, &regulator_map_list, list) {
1233 /* If the mapping has a device set up it must match */
1234 if (map->dev_name &&
1235 (!devname || strcmp(map->dev_name, devname)))
1236 continue;
1237
1238 if (strcmp(map->supply, supply) == 0)
1239 return map->regulator;
1240 }
1241
1242
69511a45
RN		 1243 return NULL;
1244}
1245
5ffbd136
MB		 1246/* Internal regulator request function */
1247static struct regulator *_regulator_get(struct device *dev, const char *id,
1248 int exclusive)
414c70cb
LG		 1249{
1250 struct regulator_dev *rdev;
04bf3011 1251 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
40f9244f 1252 const char *devname = NULL;
5ffbd136 1253 int ret;
414c70cb
LG		 1254
1255 if (id == NULL) {
5da84fd9 1256 pr_err("get() with no identifier\n");
414c70cb
LG		 1257 return regulator;
1258 }
1259
40f9244f
MB		 1260 if (dev)
1261 devname = dev_name(dev);
1262
414c70cb
LG		 1263 mutex_lock(&regulator_list_mutex);
1264
6d191a5f 1265 rdev = regulator_dev_lookup(dev, id, &ret);
69511a45
RN		 1266 if (rdev)
1267 goto found;
1268
688fe99a
MB		 1269 if (board_wants_dummy_regulator) {
1270 rdev = dummy_regulator_rdev;
1271 goto found;
1272 }
1273
34abbd68
MB		 1274#ifdef CONFIG_REGULATOR_DUMMY
1275 if (!devname)
1276 devname = "deviceless";
1277
1278 /* If the board didn't flag that it was fully constrained then
1279 * substitute in a dummy regulator so consumers can continue.
1280 */
1281 if (!has_full_constraints) {
5da84fd9
JP		 1282 pr_warn("%s supply %s not found, using dummy regulator\n",
1283 devname, id);
34abbd68
MB		 1284 rdev = dummy_regulator_rdev;
1285 goto found;
1286 }
1287#endif
1288
414c70cb
LG		 1289 mutex_unlock(&regulator_list_mutex);
1290 return regulator;
1291
1292found:
5ffbd136
MB		 1293 if (rdev->exclusive) {
1294 regulator = ERR_PTR(-EPERM);
1295 goto out;
1296 }
1297
1298 if (exclusive && rdev->open_count) {
1299 regulator = ERR_PTR(-EBUSY);
1300 goto out;
1301 }
1302
a5766f11
LG		 1303 if (!try_module_get(rdev->owner))
1304 goto out;
1305
414c70cb
LG		 1306 regulator = create_regulator(rdev, dev, id);
1307 if (regulator == NULL) {
1308 regulator = ERR_PTR(-ENOMEM);
1309 module_put(rdev->owner);
bcda4321 1310 goto out;
414c70cb
LG		 1311 }
1312
5ffbd136
MB		 1313 rdev->open_count++;
1314 if (exclusive) {
1315 rdev->exclusive = 1;
1316
1317 ret = _regulator_is_enabled(rdev);
1318 if (ret > 0)
1319 rdev->use_count = 1;
1320 else
1321 rdev->use_count = 0;
1322 }
1323
a5766f11 1324out:
414c70cb 1325 mutex_unlock(&regulator_list_mutex);
5ffbd136 1326
414c70cb
LG		 1327 return regulator;
1328}
5ffbd136
MB		 1329
1330/**
1331 * regulator_get - lookup and obtain a reference to a regulator.
1332 * @dev: device for regulator "consumer"
1333 * @id: Supply name or regulator ID.
1334 *
1335 * Returns a struct regulator corresponding to the regulator producer,
1336 * or IS_ERR() condition containing errno.
1337 *
1338 * Use of supply names configured via regulator_set_device_supply() is
1339 * strongly encouraged. It is recommended that the supply name used
1340 * should match the name used for the supply and/or the relevant
1341 * device pins in the datasheet.
1342 */
1343struct regulator *regulator_get(struct device *dev, const char *id)
1344{
1345 return _regulator_get(dev, id, 0);
1346}
414c70cb
LG		 1347EXPORT_SYMBOL_GPL(regulator_get);
1348
070b9079
SB		 1349static void devm_regulator_release(struct device *dev, void *res)
1350{
1351 regulator_put(*(struct regulator **)res);
1352}
1353
1354/**
1355 * devm_regulator_get - Resource managed regulator_get()
1356 * @dev: device for regulator "consumer"
1357 * @id: Supply name or regulator ID.
1358 *
1359 * Managed regulator_get(). Regulators returned from this function are
1360 * automatically regulator_put() on driver detach. See regulator_get() for more
1361 * information.
1362 */
1363struct regulator *devm_regulator_get(struct device *dev, const char *id)
1364{
1365 struct regulator **ptr, *regulator;
1366
1367 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1368 if (!ptr)
1369 return ERR_PTR(-ENOMEM);
1370
1371 regulator = regulator_get(dev, id);
1372 if (!IS_ERR(regulator)) {
1373 *ptr = regulator;
1374 devres_add(dev, ptr);
1375 } else {
1376 devres_free(ptr);
1377 }
1378
1379 return regulator;
1380}
1381EXPORT_SYMBOL_GPL(devm_regulator_get);
1382
5ffbd136
MB		 1383/**
1384 * regulator_get_exclusive - obtain exclusive access to a regulator.
1385 * @dev: device for regulator "consumer"
1386 * @id: Supply name or regulator ID.
1387 *
1388 * Returns a struct regulator corresponding to the regulator producer,
1389 * or IS_ERR() condition containing errno. Other consumers will be
1390 * unable to obtain this reference is held and the use count for the
1391 * regulator will be initialised to reflect the current state of the
1392 * regulator.
1393 *
1394 * This is intended for use by consumers which cannot tolerate shared
1395 * use of the regulator such as those which need to force the
1396 * regulator off for correct operation of the hardware they are
1397 * controlling.
1398 *
1399 * Use of supply names configured via regulator_set_device_supply() is
1400 * strongly encouraged. It is recommended that the supply name used
1401 * should match the name used for the supply and/or the relevant
1402 * device pins in the datasheet.
1403 */
1404struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1405{
1406 return _regulator_get(dev, id, 1);
1407}
1408EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1409
414c70cb
LG		 1410/**
1411 * regulator_put - "free" the regulator source
1412 * @regulator: regulator source
1413 *
1414 * Note: drivers must ensure that all regulator_enable calls made on this
1415 * regulator source are balanced by regulator_disable calls prior to calling
1416 * this function.
1417 */
1418void regulator_put(struct regulator *regulator)
1419{
1420 struct regulator_dev *rdev;
1421
1422 if (regulator == NULL || IS_ERR(regulator))
1423 return;
1424
414c70cb
LG		 1425 mutex_lock(&regulator_list_mutex);
1426 rdev = regulator->rdev;
1427
5de70519 1428 debugfs_remove_recursive(regulator->debugfs);
5de70519 1429
414c70cb
LG		 1430 /* remove any sysfs entries */
1431 if (regulator->dev) {
1432 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
414c70cb
LG		 1433 device_remove_file(regulator->dev, &regulator->dev_attr);
1434 kfree(regulator->dev_attr.attr.name);
1435 }
5de70519 1436 kfree(regulator->supply_name);
414c70cb
LG		 1437 list_del(&regulator->list);
1438 kfree(regulator);
1439
5ffbd136
MB		 1440 rdev->open_count--;
1441 rdev->exclusive = 0;
1442
414c70cb
LG		 1443 module_put(rdev->owner);
1444 mutex_unlock(&regulator_list_mutex);
1445}
1446EXPORT_SYMBOL_GPL(regulator_put);
1447
d5ad34f7
MB		 1448static int devm_regulator_match(struct device *dev, void *res, void *data)
1449{
1450 struct regulator **r = res;
1451 if (!r || !*r) {
1452 WARN_ON(!r || !*r);
1453 return 0;
1454 }
1455 return *r == data;
1456}
1457
1458/**
1459 * devm_regulator_put - Resource managed regulator_put()
1460 * @regulator: regulator to free
1461 *
1462 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1463 * this function will not need to be called and the resource management
1464 * code will ensure that the resource is freed.
1465 */
1466void devm_regulator_put(struct regulator *regulator)
1467{
1468 int rc;
1469
361ff501 1470 rc = devres_release(regulator->dev, devm_regulator_release,
d5ad34f7 1471 devm_regulator_match, regulator);
968c2c17
MB		 1472 if (rc == 0)
1473 regulator_put(regulator);
1474 else
1475 WARN_ON(rc);
d5ad34f7
MB		 1476}
1477EXPORT_SYMBOL_GPL(devm_regulator_put);
1478
414c70cb
LG		 1479/* locks held by regulator_enable() */
1480static int _regulator_enable(struct regulator_dev *rdev)
1481{
31aae2be 1482 int ret, delay;
414c70cb 1483
414c70cb 1484 /* check voltage and requested load before enabling */
9a2372fa
MB		 1485 if (rdev->constraints &&
1486 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1487 drms_uA_update(rdev);
414c70cb 1488
9a2372fa
MB		 1489 if (rdev->use_count == 0) {
1490 /* The regulator may on if it's not switchable or left on */
1491 ret = _regulator_is_enabled(rdev);
1492 if (ret == -EINVAL || ret == 0) {
1493 if (!_regulator_can_change_status(rdev))
1494 return -EPERM;
1495
31aae2be 1496 if (!rdev->desc->ops->enable)
9a2372fa 1497 return -EINVAL;
31aae2be
MB		 1498
1499 /* Query before enabling in case configuration
25985edc 1500 * dependent. */
31aae2be
MB		 1501 ret = _regulator_get_enable_time(rdev);
1502 if (ret >= 0) {
1503 delay = ret;
1504 } else {
5da84fd9 1505 rdev_warn(rdev, "enable_time() failed: %d\n",
1d7372e1 1506 ret);
31aae2be 1507 delay = 0;
9a2372fa 1508 }
31aae2be 1509
02fa3ec0
MB		 1510 trace_regulator_enable(rdev_get_name(rdev));
1511
31aae2be
MB		 1512 /* Allow the regulator to ramp; it would be useful
1513 * to extend this for bulk operations so that the
1514 * regulators can ramp together. */
1515 ret = rdev->desc->ops->enable(rdev);
1516 if (ret < 0)
1517 return ret;
1518
02fa3ec0
MB		 1519 trace_regulator_enable_delay(rdev_get_name(rdev));
1520
e36c1df8 1521 if (delay >= 1000) {
31aae2be 1522 mdelay(delay / 1000);
e36c1df8
AL		 1523 udelay(delay % 1000);
1524 } else if (delay) {
31aae2be 1525 udelay(delay);
e36c1df8 1526 }
31aae2be 1527
02fa3ec0
MB		 1528 trace_regulator_enable_complete(rdev_get_name(rdev));
1529
a7433cff 1530 } else if (ret < 0) {
5da84fd9 1531 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 1532 return ret;
1533 }
a7433cff 1534 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 1535 }
1536
9a2372fa
MB		 1537 rdev->use_count++;
1538
1539 return 0;
414c70cb
LG		 1540}
1541
1542/**
1543 * regulator_enable - enable regulator output
1544 * @regulator: regulator source
1545 *
cf7bbcdf
MB		 1546 * Request that the regulator be enabled with the regulator output at
1547 * the predefined voltage or current value. Calls to regulator_enable()
1548 * must be balanced with calls to regulator_disable().
1549 *
414c70cb 1550 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 1551 * hardwired in the regulator.
414c70cb
LG		 1552 */
1553int regulator_enable(struct regulator *regulator)
1554{
412aec61
DB		 1555 struct regulator_dev *rdev = regulator->rdev;
1556 int ret = 0;
414c70cb 1557
6492bc1b
MB		 1558 if (regulator->always_on)
1559 return 0;
1560
3801b86a
MB		 1561 if (rdev->supply) {
1562 ret = regulator_enable(rdev->supply);
1563 if (ret != 0)
1564 return ret;
1565 }
1566
412aec61 1567 mutex_lock(&rdev->mutex);
cd94b505 1568 ret = _regulator_enable(rdev);
412aec61 1569 mutex_unlock(&rdev->mutex);
3801b86a 1570
d1685e4e 1571 if (ret != 0 && rdev->supply)
3801b86a
MB		 1572 regulator_disable(rdev->supply);
1573
414c70cb
LG		 1574 return ret;
1575}
1576EXPORT_SYMBOL_GPL(regulator_enable);
1577
1578/* locks held by regulator_disable() */
3801b86a 1579static int _regulator_disable(struct regulator_dev *rdev)
414c70cb
LG		 1580{
1581 int ret = 0;
1582
cd94b505 1583 if (WARN(rdev->use_count <= 0,
43e7ee33 1584 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 1585 return -EIO;
1586
414c70cb 1587 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 1588 if (rdev->use_count == 1 &&
1589 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 1590
1591 /* we are last user */
9a2372fa
MB		 1592 if (_regulator_can_change_status(rdev) &&
1593 rdev->desc->ops->disable) {
02fa3ec0
MB		 1594 trace_regulator_disable(rdev_get_name(rdev));
1595
414c70cb
LG		 1596 ret = rdev->desc->ops->disable(rdev);
1597 if (ret < 0) {
5da84fd9 1598 rdev_err(rdev, "failed to disable\n");
414c70cb
LG		 1599 return ret;
1600 }
84b68263 1601
02fa3ec0
MB		 1602 trace_regulator_disable_complete(rdev_get_name(rdev));
1603
84b68263
MB		 1604 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1605 NULL);
414c70cb
LG		 1606 }
1607
414c70cb
LG		 1608 rdev->use_count = 0;
1609 } else if (rdev->use_count > 1) {
1610
1611 if (rdev->constraints &&
1612 (rdev->constraints->valid_ops_mask &
1613 REGULATOR_CHANGE_DRMS))
1614 drms_uA_update(rdev);
1615
1616 rdev->use_count--;
1617 }
3801b86a 1618
414c70cb
LG		 1619 return ret;
1620}
1621
1622/**
1623 * regulator_disable - disable regulator output
1624 * @regulator: regulator source
1625 *
cf7bbcdf
MB		 1626 * Disable the regulator output voltage or current. Calls to
1627 * regulator_enable() must be balanced with calls to
1628 * regulator_disable().
69279fb9 1629 *
414c70cb 1630 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 1631 * devices have it enabled, the regulator device supports disabling and
1632 * machine constraints permit this operation.
414c70cb
LG		 1633 */
1634int regulator_disable(struct regulator *regulator)
1635{
412aec61
DB		 1636 struct regulator_dev *rdev = regulator->rdev;
1637 int ret = 0;
414c70cb 1638
6492bc1b
MB		 1639 if (regulator->always_on)
1640 return 0;
1641
412aec61 1642 mutex_lock(&rdev->mutex);
3801b86a 1643 ret = _regulator_disable(rdev);
412aec61 1644 mutex_unlock(&rdev->mutex);
8cbf811d 1645
3801b86a
MB		 1646 if (ret == 0 && rdev->supply)
1647 regulator_disable(rdev->supply);
8cbf811d 1648
414c70cb
LG		 1649 return ret;
1650}
1651EXPORT_SYMBOL_GPL(regulator_disable);
1652
1653/* locks held by regulator_force_disable() */
3801b86a 1654static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 1655{
1656 int ret = 0;
1657
1658 /* force disable */
1659 if (rdev->desc->ops->disable) {
1660 /* ah well, who wants to live forever... */
1661 ret = rdev->desc->ops->disable(rdev);
1662 if (ret < 0) {
5da84fd9 1663 rdev_err(rdev, "failed to force disable\n");
414c70cb
LG		 1664 return ret;
1665 }
1666 /* notify other consumers that power has been forced off */
84b68263
MB		 1667 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1668 REGULATOR_EVENT_DISABLE, NULL);
414c70cb
LG		 1669 }
1670
414c70cb
LG		 1671 return ret;
1672}
1673
1674/**
1675 * regulator_force_disable - force disable regulator output
1676 * @regulator: regulator source
1677 *
1678 * Forcibly disable the regulator output voltage or current.
1679 * NOTE: this *will* disable the regulator output even if other consumer
1680 * devices have it enabled. This should be used for situations when device
1681 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1682 */
1683int regulator_force_disable(struct regulator *regulator)
1684{
82d15839 1685 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 1686 int ret;
1687
82d15839 1688 mutex_lock(&rdev->mutex);
414c70cb 1689 regulator->uA_load = 0;
3801b86a 1690 ret = _regulator_force_disable(regulator->rdev);
82d15839 1691 mutex_unlock(&rdev->mutex);
8cbf811d 1692
3801b86a
MB		 1693 if (rdev->supply)
1694 while (rdev->open_count--)
1695 regulator_disable(rdev->supply);
8cbf811d 1696
414c70cb
LG		 1697 return ret;
1698}
1699EXPORT_SYMBOL_GPL(regulator_force_disable);
1700
da07ecd9
MB		 1701static void regulator_disable_work(struct work_struct *work)
1702{
1703 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1704 disable_work.work);
1705 int count, i, ret;
1706
1707 mutex_lock(&rdev->mutex);
1708
1709 BUG_ON(!rdev->deferred_disables);
1710
1711 count = rdev->deferred_disables;
1712 rdev->deferred_disables = 0;
1713
1714 for (i = 0; i < count; i++) {
1715 ret = _regulator_disable(rdev);
1716 if (ret != 0)
1717 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1718 }
1719
1720 mutex_unlock(&rdev->mutex);
1721
1722 if (rdev->supply) {
1723 for (i = 0; i < count; i++) {
1724 ret = regulator_disable(rdev->supply);
1725 if (ret != 0) {
1726 rdev_err(rdev,
1727 "Supply disable failed: %d\n", ret);
1728 }
1729 }
1730 }
1731}
1732
1733/**
1734 * regulator_disable_deferred - disable regulator output with delay
1735 * @regulator: regulator source
1736 * @ms: miliseconds until the regulator is disabled
1737 *
1738 * Execute regulator_disable() on the regulator after a delay. This
1739 * is intended for use with devices that require some time to quiesce.
1740 *
1741 * NOTE: this will only disable the regulator output if no other consumer
1742 * devices have it enabled, the regulator device supports disabling and
1743 * machine constraints permit this operation.
1744 */
1745int regulator_disable_deferred(struct regulator *regulator, int ms)
1746{
1747 struct regulator_dev *rdev = regulator->rdev;
aa59802d 1748 int ret;
da07ecd9 1749
6492bc1b
MB		 1750 if (regulator->always_on)
1751 return 0;
1752
da07ecd9
MB		 1753 mutex_lock(&rdev->mutex);
1754 rdev->deferred_disables++;
1755 mutex_unlock(&rdev->mutex);
1756
aa59802d
MB		 1757 ret = schedule_delayed_work(&rdev->disable_work,
1758 msecs_to_jiffies(ms));
1759 if (ret < 0)
1760 return ret;
1761 else
1762 return 0;
da07ecd9
MB		 1763}
1764EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1765
cd6dffb4
MB		 1766/**
1767 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1768 *
1769 * @rdev: regulator to operate on
1770 *
1771 * Regulators that use regmap for their register I/O can set the
1772 * enable_reg and enable_mask fields in their descriptor and then use
1773 * this as their is_enabled operation, saving some code.
1774 */
1775int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1776{
1777 unsigned int val;
1778 int ret;
1779
1780 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1781 if (ret != 0)
1782 return ret;
1783
1784 return (val & rdev->desc->enable_mask) != 0;
1785}
1786EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1787
1788/**
1789 * regulator_enable_regmap - standard enable() for regmap users
1790 *
1791 * @rdev: regulator to operate on
1792 *
1793 * Regulators that use regmap for their register I/O can set the
1794 * enable_reg and enable_mask fields in their descriptor and then use
1795 * this as their enable() operation, saving some code.
1796 */
1797int regulator_enable_regmap(struct regulator_dev *rdev)
1798{
1799 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1800 rdev->desc->enable_mask,
1801 rdev->desc->enable_mask);
1802}
1803EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1804
1805/**
1806 * regulator_disable_regmap - standard disable() for regmap users
1807 *
1808 * @rdev: regulator to operate on
1809 *
1810 * Regulators that use regmap for their register I/O can set the
1811 * enable_reg and enable_mask fields in their descriptor and then use
1812 * this as their disable() operation, saving some code.
1813 */
1814int regulator_disable_regmap(struct regulator_dev *rdev)
1815{
1816 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1817 rdev->desc->enable_mask, 0);
1818}
1819EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1820
414c70cb
LG		 1821static int _regulator_is_enabled(struct regulator_dev *rdev)
1822{
9a7f6a4c 1823 /* If we don't know then assume that the regulator is always on */
9332546f 1824 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 1825 return 1;
414c70cb 1826
9332546f 1827 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 1828}
1829
1830/**
1831 * regulator_is_enabled - is the regulator output enabled
1832 * @regulator: regulator source
1833 *
412aec61
DB		 1834 * Returns positive if the regulator driver backing the source/client
1835 * has requested that the device be enabled, zero if it hasn't, else a
1836 * negative errno code.
1837 *
1838 * Note that the device backing this regulator handle can have multiple
1839 * users, so it might be enabled even if regulator_enable() was never
1840 * called for this particular source.
414c70cb
LG		 1841 */
1842int regulator_is_enabled(struct regulator *regulator)
1843{
9332546f
MB		 1844 int ret;
1845
6492bc1b
MB		 1846 if (regulator->always_on)
1847 return 1;
1848
9332546f
MB		 1849 mutex_lock(&regulator->rdev->mutex);
1850 ret = _regulator_is_enabled(regulator->rdev);
1851 mutex_unlock(&regulator->rdev->mutex);
1852
1853 return ret;
414c70cb
LG		 1854}
1855EXPORT_SYMBOL_GPL(regulator_is_enabled);
1856
4367cfdc
DB		 1857/**
1858 * regulator_count_voltages - count regulator_list_voltage() selectors
1859 * @regulator: regulator source
1860 *
1861 * Returns number of selectors, or negative errno. Selectors are
1862 * numbered starting at zero, and typically correspond to bitfields
1863 * in hardware registers.
1864 */
1865int regulator_count_voltages(struct regulator *regulator)
1866{
1867 struct regulator_dev *rdev = regulator->rdev;
1868
1869 return rdev->desc->n_voltages ? : -EINVAL;
1870}
1871EXPORT_SYMBOL_GPL(regulator_count_voltages);
1872
bca7bbff
MB		 1873/**
1874 * regulator_list_voltage_linear - List voltages with simple calculation
1875 *
1876 * @rdev: Regulator device
1877 * @selector: Selector to convert into a voltage
1878 *
1879 * Regulators with a simple linear mapping between voltages and
1880 * selectors can set min_uV and uV_step in the regulator descriptor
1881 * and then use this function as their list_voltage() operation,
1882 */
1883int regulator_list_voltage_linear(struct regulator_dev *rdev,
1884 unsigned int selector)
1885{
1886 if (selector >= rdev->desc->n_voltages)
1887 return -EINVAL;
1888
1889 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
1890}
1891EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
1892
cffc9592
AL		 1893/**
1894 * regulator_list_voltage_table - List voltages with table based mapping
1895 *
1896 * @rdev: Regulator device
1897 * @selector: Selector to convert into a voltage
1898 *
1899 * Regulators with table based mapping between voltages and
1900 * selectors can set volt_table in the regulator descriptor
1901 * and then use this function as their list_voltage() operation.
1902 */
1903int regulator_list_voltage_table(struct regulator_dev *rdev,
1904 unsigned int selector)
1905{
1906 if (!rdev->desc->volt_table) {
1907 BUG_ON(!rdev->desc->volt_table);
1908 return -EINVAL;
1909 }
1910
1911 if (selector >= rdev->desc->n_voltages)
1912 return -EINVAL;
1913
1914 return rdev->desc->volt_table[selector];
1915}
1916EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
1917
4367cfdc
DB		 1918/**
1919 * regulator_list_voltage - enumerate supported voltages
1920 * @regulator: regulator source
1921 * @selector: identify voltage to list
1922 * Context: can sleep
1923 *
1924 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 1925 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 1926 * negative errno.
1927 */
1928int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1929{
1930 struct regulator_dev *rdev = regulator->rdev;
1931 struct regulator_ops *ops = rdev->desc->ops;
1932 int ret;
1933
1934 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1935 return -EINVAL;
1936
1937 mutex_lock(&rdev->mutex);
1938 ret = ops->list_voltage(rdev, selector);
1939 mutex_unlock(&rdev->mutex);
1940
1941 if (ret > 0) {
1942 if (ret < rdev->constraints->min_uV)
1943 ret = 0;
1944 else if (ret > rdev->constraints->max_uV)
1945 ret = 0;
1946 }
1947
1948 return ret;
1949}
1950EXPORT_SYMBOL_GPL(regulator_list_voltage);
1951
a7a1ad90
MB		 1952/**
1953 * regulator_is_supported_voltage - check if a voltage range can be supported
1954 *
1955 * @regulator: Regulator to check.
1956 * @min_uV: Minimum required voltage in uV.
1957 * @max_uV: Maximum required voltage in uV.
1958 *
1959 * Returns a boolean or a negative error code.
1960 */
1961int regulator_is_supported_voltage(struct regulator *regulator,
1962 int min_uV, int max_uV)
1963{
1964 int i, voltages, ret;
1965
1966 ret = regulator_count_voltages(regulator);
1967 if (ret < 0)
1968 return ret;
1969 voltages = ret;
1970
1971 for (i = 0; i < voltages; i++) {
1972 ret = regulator_list_voltage(regulator, i);
1973
1974 if (ret >= min_uV && ret <= max_uV)
1975 return 1;
1976 }
1977
1978 return 0;
1979}
a398eaa2 1980EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 1981
4ab5b3d9
MB		 1982/**
1983 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
1984 *
1985 * @rdev: regulator to operate on
1986 *
1987 * Regulators that use regmap for their register I/O can set the
1988 * vsel_reg and vsel_mask fields in their descriptor and then use this
1989 * as their get_voltage_vsel operation, saving some code.
1990 */
1991int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
1992{
1993 unsigned int val;
1994 int ret;
1995
1996 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
1997 if (ret != 0)
1998 return ret;
1999
2000 val &= rdev->desc->vsel_mask;
2001 val >>= ffs(rdev->desc->vsel_mask) - 1;
2002
2003 return val;
2004}
2005EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
2006
2007/**
2008 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2009 *
2010 * @rdev: regulator to operate on
2011 * @sel: Selector to set
2012 *
2013 * Regulators that use regmap for their register I/O can set the
2014 * vsel_reg and vsel_mask fields in their descriptor and then use this
2015 * as their set_voltage_vsel operation, saving some code.
2016 */
2017int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
2018{
2019 sel <<= ffs(rdev->desc->vsel_mask) - 1;
2020
2021 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
2022 rdev->desc->vsel_mask, sel);
2023}
2024EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
2025
e843fc46
MB		 2026/**
2027 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2028 *
2029 * @rdev: Regulator to operate on
2030 * @min_uV: Lower bound for voltage
2031 * @max_uV: Upper bound for voltage
2032 *
2033 * Drivers implementing set_voltage_sel() and list_voltage() can use
2034 * this as their map_voltage() operation. It will find a suitable
2035 * voltage by calling list_voltage() until it gets something in bounds
2036 * for the requested voltages.
2037 */
2038int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2039 int min_uV, int max_uV)
2040{
2041 int best_val = INT_MAX;
2042 int selector = 0;
2043 int i, ret;
2044
2045 /* Find the smallest voltage that falls within the specified
2046 * range.
2047 */
2048 for (i = 0; i < rdev->desc->n_voltages; i++) {
2049 ret = rdev->desc->ops->list_voltage(rdev, i);
2050 if (ret < 0)
2051 continue;
2052
2053 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2054 best_val = ret;
2055 selector = i;
2056 }
2057 }
2058
2059 if (best_val != INT_MAX)
2060 return selector;
2061 else
2062 return -EINVAL;
2063}
2064EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2065
bca7bbff
MB		 2066/**
2067 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2068 *
2069 * @rdev: Regulator to operate on
2070 * @min_uV: Lower bound for voltage
2071 * @max_uV: Upper bound for voltage
2072 *
2073 * Drivers providing min_uV and uV_step in their regulator_desc can
2074 * use this as their map_voltage() operation.
2075 */
2076int regulator_map_voltage_linear(struct regulator_dev *rdev,
2077 int min_uV, int max_uV)
2078{
2079 int ret, voltage;
2080
5a6881e8
AL		 2081 /* Allow uV_step to be 0 for fixed voltage */
2082 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
2083 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
2084 return 0;
2085 else
2086 return -EINVAL;
2087 }
2088
bca7bbff
MB		 2089 if (!rdev->desc->uV_step) {
2090 BUG_ON(!rdev->desc->uV_step);
2091 return -EINVAL;
2092 }
2093
ccfcb1c3 2094 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
bca7bbff
MB		 2095 if (ret < 0)
2096 return ret;
2097
2098 /* Map back into a voltage to verify we're still in bounds */
2099 voltage = rdev->desc->ops->list_voltage(rdev, ret);
2100 if (voltage < min_uV || voltage > max_uV)
2101 return -EINVAL;
2102
2103 return ret;
2104}
2105EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2106
75790251
MB		 2107static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2108 int min_uV, int max_uV)
2109{
2110 int ret;
77af1b26 2111 int delay = 0;
e843fc46 2112 int best_val;
75790251 2113 unsigned int selector;
eba41a5e 2114 int old_selector = -1;
75790251
MB		 2115
2116 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2117
bf5892a8
MB		 2118 min_uV += rdev->constraints->uV_offset;
2119 max_uV += rdev->constraints->uV_offset;
2120
eba41a5e
AL		 2121 /*
2122 * If we can't obtain the old selector there is not enough
2123 * info to call set_voltage_time_sel().
2124 */
8b7485ef
AL		 2125 if (_regulator_is_enabled(rdev) &&
2126 rdev->desc->ops->set_voltage_time_sel &&
eba41a5e
AL		 2127 rdev->desc->ops->get_voltage_sel) {
2128 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2129 if (old_selector < 0)
2130 return old_selector;
2131 }
2132
75790251
MB		 2133 if (rdev->desc->ops->set_voltage) {
2134 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2135 &selector);
e8eef82b 2136 } else if (rdev->desc->ops->set_voltage_sel) {
e843fc46
MB		 2137 if (rdev->desc->ops->map_voltage)
2138 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2139 max_uV);
2140 else
2141 ret = regulator_map_voltage_iterate(rdev, min_uV,
2142 max_uV);
e8eef82b 2143
e843fc46
MB		 2144 if (ret >= 0) {
2145 selector = ret;
2146 ret = rdev->desc->ops->set_voltage_sel(rdev, ret);
e8eef82b 2147 }
75790251
MB		 2148 } else {
2149 ret = -EINVAL;
2150 }
e8eef82b 2151
e843fc46
MB		 2152 if (rdev->desc->ops->list_voltage)
2153 best_val = rdev->desc->ops->list_voltage(rdev, selector);
2154 else
2155 best_val = -1;
77af1b26 2156
eba41a5e 2157 /* Call set_voltage_time_sel if successfully obtained old_selector */
8b7485ef 2158 if (_regulator_is_enabled(rdev) && ret == 0 && old_selector >= 0 &&
eba41a5e 2159 rdev->desc->ops->set_voltage_time_sel) {
77af1b26 2160
eba41a5e
AL		 2161 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2162 old_selector, selector);
2163 if (delay < 0) {
2164 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2165 delay);
2166 delay = 0;
e8eef82b 2167 }
75790251
MB		 2168 }
2169
77af1b26
LW		 2170 /* Insert any necessary delays */
2171 if (delay >= 1000) {
2172 mdelay(delay / 1000);
2173 udelay(delay % 1000);
2174 } else if (delay) {
2175 udelay(delay);
2176 }
2177
ded06a52
MB		 2178 if (ret == 0)
2179 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2180 NULL);
2181
eba41a5e 2182 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
75790251
MB		 2183
2184 return ret;
2185}
2186
414c70cb
LG		 2187/**
2188 * regulator_set_voltage - set regulator output voltage
2189 * @regulator: regulator source
2190 * @min_uV: Minimum required voltage in uV
2191 * @max_uV: Maximum acceptable voltage in uV
2192 *
2193 * Sets a voltage regulator to the desired output voltage. This can be set
2194 * during any regulator state. IOW, regulator can be disabled or enabled.
2195 *
2196 * If the regulator is enabled then the voltage will change to the new value
2197 * immediately otherwise if the regulator is disabled the regulator will
2198 * output at the new voltage when enabled.
2199 *
2200 * NOTE: If the regulator is shared between several devices then the lowest
2201 * request voltage that meets the system constraints will be used.
69279fb9 2202 * Regulator system constraints must be set for this regulator before
414c70cb
LG		 2203 * calling this function otherwise this call will fail.
2204 */
2205int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2206{
2207 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 2208 int ret = 0;
414c70cb
LG		 2209
2210 mutex_lock(&rdev->mutex);
2211
95a3c23a
MB		 2212 /* If we're setting the same range as last time the change
2213 * should be a noop (some cpufreq implementations use the same
2214 * voltage for multiple frequencies, for example).
2215 */
2216 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2217 goto out;
2218
414c70cb 2219 /* sanity check */
e8eef82b
MB		 2220 if (!rdev->desc->ops->set_voltage &&
2221 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 2222 ret = -EINVAL;
2223 goto out;
2224 }
2225
2226 /* constraints check */
2227 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2228 if (ret < 0)
2229 goto out;
2230 regulator->min_uV = min_uV;
2231 regulator->max_uV = max_uV;
3a93f2a9 2232
05fda3b1
TP		 2233 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2234 if (ret < 0)
2235 goto out;
2236
75790251 2237 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
02fa3ec0 2238
414c70cb
LG		 2239out:
2240 mutex_unlock(&rdev->mutex);
2241 return ret;
2242}
2243EXPORT_SYMBOL_GPL(regulator_set_voltage);
2244
88cd222b
LW		 2245/**
2246 * regulator_set_voltage_time - get raise/fall time
2247 * @regulator: regulator source
2248 * @old_uV: starting voltage in microvolts
2249 * @new_uV: target voltage in microvolts
2250 *
2251 * Provided with the starting and ending voltage, this function attempts to
2252 * calculate the time in microseconds required to rise or fall to this new
2253 * voltage.
2254 */
2255int regulator_set_voltage_time(struct regulator *regulator,
2256 int old_uV, int new_uV)
2257{
2258 struct regulator_dev *rdev = regulator->rdev;
2259 struct regulator_ops *ops = rdev->desc->ops;
2260 int old_sel = -1;
2261 int new_sel = -1;
2262 int voltage;
2263 int i;
2264
2265 /* Currently requires operations to do this */
2266 if (!ops->list_voltage || !ops->set_voltage_time_sel
2267 || !rdev->desc->n_voltages)
2268 return -EINVAL;
2269
2270 for (i = 0; i < rdev->desc->n_voltages; i++) {
2271 /* We only look for exact voltage matches here */
2272 voltage = regulator_list_voltage(regulator, i);
2273 if (voltage < 0)
2274 return -EINVAL;
2275 if (voltage == 0)
2276 continue;
2277 if (voltage == old_uV)
2278 old_sel = i;
2279 if (voltage == new_uV)
2280 new_sel = i;
2281 }
2282
2283 if (old_sel < 0 || new_sel < 0)
2284 return -EINVAL;
2285
2286 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2287}
2288EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2289
98a175b6
YSB		 2290/**
2291 *regulator_set_voltage_time_sel - get raise/fall time
2292 * @regulator: regulator source
2293 * @old_selector: selector for starting voltage
2294 * @new_selector: selector for target voltage
2295 *
2296 * Provided with the starting and target voltage selectors, this function
2297 * returns time in microseconds required to rise or fall to this new voltage
2298 *
398715ab
AL		 2299 * Drivers providing uV_step or volt_table in their regulator_desc and
2300 * ramp_delay in regulation_constraints can use this as their
2301 * set_voltage_time_sel() operation.
98a175b6
YSB		 2302 */
2303int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2304 unsigned int old_selector,
2305 unsigned int new_selector)
2306{
398715ab
AL		 2307 unsigned int ramp_delay = 0;
2308
2309 if (rdev->constraints->ramp_delay)
2310 ramp_delay = rdev->constraints->ramp_delay;
2311 else if (rdev->desc->ramp_delay)
2312 ramp_delay = rdev->desc->ramp_delay;
2313
2314 if (ramp_delay == 0) {
6f0b2c69 2315 rdev_warn(rdev, "ramp_delay not set\n");
398715ab 2316 return 0;
6f0b2c69 2317 }
398715ab
AL		 2318
2319 if (rdev->desc->uV_step) {
2320 return DIV_ROUND_UP(rdev->desc->uV_step *
2321 abs(new_selector - old_selector),
ea38d13f 2322 ramp_delay);
398715ab
AL		 2323 } else if (rdev->desc->volt_table) {
2324 return DIV_ROUND_UP(abs(rdev->desc->volt_table[new_selector] -
2325 rdev->desc->volt_table[old_selector]),
ea38d13f 2326 ramp_delay);
398715ab
AL		 2327 } else {
2328 rdev_warn(rdev, "Unsupported voltage mapping settings\n");
2329 }
2330
98a175b6
YSB		 2331 return 0;
2332}
b19dbf71 2333EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
98a175b6 2334
606a2562
MB		 2335/**
2336 * regulator_sync_voltage - re-apply last regulator output voltage
2337 * @regulator: regulator source
2338 *
2339 * Re-apply the last configured voltage. This is intended to be used
2340 * where some external control source the consumer is cooperating with
2341 * has caused the configured voltage to change.
2342 */
2343int regulator_sync_voltage(struct regulator *regulator)
2344{
2345 struct regulator_dev *rdev = regulator->rdev;
2346 int ret, min_uV, max_uV;
2347
2348 mutex_lock(&rdev->mutex);
2349
2350 if (!rdev->desc->ops->set_voltage &&
2351 !rdev->desc->ops->set_voltage_sel) {
2352 ret = -EINVAL;
2353 goto out;
2354 }
2355
2356 /* This is only going to work if we've had a voltage configured. */
2357 if (!regulator->min_uV && !regulator->max_uV) {
2358 ret = -EINVAL;
2359 goto out;
2360 }
2361
2362 min_uV = regulator->min_uV;
2363 max_uV = regulator->max_uV;
2364
2365 /* This should be a paranoia check... */
2366 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2367 if (ret < 0)
2368 goto out;
2369
2370 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2371 if (ret < 0)
2372 goto out;
2373
2374 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2375
2376out:
2377 mutex_unlock(&rdev->mutex);
2378 return ret;
2379}
2380EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2381
414c70cb
LG		 2382static int _regulator_get_voltage(struct regulator_dev *rdev)
2383{
bf5892a8 2384 int sel, ret;
476c2d83
MB		 2385
2386 if (rdev->desc->ops->get_voltage_sel) {
2387 sel = rdev->desc->ops->get_voltage_sel(rdev);
2388 if (sel < 0)
2389 return sel;
bf5892a8 2390 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 2391 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 2392 ret = rdev->desc->ops->get_voltage(rdev);
cb220d16 2393 } else {
414c70cb 2394 return -EINVAL;
cb220d16 2395 }
bf5892a8 2396
cb220d16
AL		 2397 if (ret < 0)
2398 return ret;
bf5892a8 2399 return ret - rdev->constraints->uV_offset;
414c70cb
LG		 2400}
2401
2402/**
2403 * regulator_get_voltage - get regulator output voltage
2404 * @regulator: regulator source
2405 *
2406 * This returns the current regulator voltage in uV.
2407 *
2408 * NOTE: If the regulator is disabled it will return the voltage value. This
2409 * function should not be used to determine regulator state.
2410 */
2411int regulator_get_voltage(struct regulator *regulator)
2412{
2413 int ret;
2414
2415 mutex_lock(&regulator->rdev->mutex);
2416
2417 ret = _regulator_get_voltage(regulator->rdev);
2418
2419 mutex_unlock(&regulator->rdev->mutex);
2420
2421 return ret;
2422}
2423EXPORT_SYMBOL_GPL(regulator_get_voltage);
2424
2425/**
2426 * regulator_set_current_limit - set regulator output current limit
2427 * @regulator: regulator source
2428 * @min_uA: Minimuum supported current in uA
2429 * @max_uA: Maximum supported current in uA
2430 *
2431 * Sets current sink to the desired output current. This can be set during
2432 * any regulator state. IOW, regulator can be disabled or enabled.
2433 *
2434 * If the regulator is enabled then the current will change to the new value
2435 * immediately otherwise if the regulator is disabled the regulator will
2436 * output at the new current when enabled.
2437 *
2438 * NOTE: Regulator system constraints must be set for this regulator before
2439 * calling this function otherwise this call will fail.
2440 */
2441int regulator_set_current_limit(struct regulator *regulator,
2442 int min_uA, int max_uA)
2443{
2444 struct regulator_dev *rdev = regulator->rdev;
2445 int ret;
2446
2447 mutex_lock(&rdev->mutex);
2448
2449 /* sanity check */
2450 if (!rdev->desc->ops->set_current_limit) {
2451 ret = -EINVAL;
2452 goto out;
2453 }
2454
2455 /* constraints check */
2456 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2457 if (ret < 0)
2458 goto out;
2459
2460 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2461out:
2462 mutex_unlock(&rdev->mutex);
2463 return ret;
2464}
2465EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2466
2467static int _regulator_get_current_limit(struct regulator_dev *rdev)
2468{
2469 int ret;
2470
2471 mutex_lock(&rdev->mutex);
2472
2473 /* sanity check */
2474 if (!rdev->desc->ops->get_current_limit) {
2475 ret = -EINVAL;
2476 goto out;
2477 }
2478
2479 ret = rdev->desc->ops->get_current_limit(rdev);
2480out:
2481 mutex_unlock(&rdev->mutex);
2482 return ret;
2483}
2484
2485/**
2486 * regulator_get_current_limit - get regulator output current
2487 * @regulator: regulator source
2488 *
2489 * This returns the current supplied by the specified current sink in uA.
2490 *
2491 * NOTE: If the regulator is disabled it will return the current value. This
2492 * function should not be used to determine regulator state.
2493 */
2494int regulator_get_current_limit(struct regulator *regulator)
2495{
2496 return _regulator_get_current_limit(regulator->rdev);
2497}
2498EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2499
2500/**
2501 * regulator_set_mode - set regulator operating mode
2502 * @regulator: regulator source
2503 * @mode: operating mode - one of the REGULATOR_MODE constants
2504 *
2505 * Set regulator operating mode to increase regulator efficiency or improve
2506 * regulation performance.
2507 *
2508 * NOTE: Regulator system constraints must be set for this regulator before
2509 * calling this function otherwise this call will fail.
2510 */
2511int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2512{
2513 struct regulator_dev *rdev = regulator->rdev;
2514 int ret;
500b4ac9 2515 int regulator_curr_mode;
414c70cb
LG		 2516
2517 mutex_lock(&rdev->mutex);
2518
2519 /* sanity check */
2520 if (!rdev->desc->ops->set_mode) {
2521 ret = -EINVAL;
2522 goto out;
2523 }
2524
500b4ac9
SI		 2525 /* return if the same mode is requested */
2526 if (rdev->desc->ops->get_mode) {
2527 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2528 if (regulator_curr_mode == mode) {
2529 ret = 0;
2530 goto out;
2531 }
2532 }
2533
414c70cb 2534 /* constraints check */
22c51b47 2535 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 2536 if (ret < 0)
2537 goto out;
2538
2539 ret = rdev->desc->ops->set_mode(rdev, mode);
2540out:
2541 mutex_unlock(&rdev->mutex);
2542 return ret;
2543}
2544EXPORT_SYMBOL_GPL(regulator_set_mode);
2545
2546static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2547{
2548 int ret;
2549
2550 mutex_lock(&rdev->mutex);
2551
2552 /* sanity check */
2553 if (!rdev->desc->ops->get_mode) {
2554 ret = -EINVAL;
2555 goto out;
2556 }
2557
2558 ret = rdev->desc->ops->get_mode(rdev);
2559out:
2560 mutex_unlock(&rdev->mutex);
2561 return ret;
2562}
2563
2564/**
2565 * regulator_get_mode - get regulator operating mode
2566 * @regulator: regulator source
2567 *
2568 * Get the current regulator operating mode.
2569 */
2570unsigned int regulator_get_mode(struct regulator *regulator)
2571{
2572 return _regulator_get_mode(regulator->rdev);
2573}
2574EXPORT_SYMBOL_GPL(regulator_get_mode);
2575
2576/**
2577 * regulator_set_optimum_mode - set regulator optimum operating mode
2578 * @regulator: regulator source
2579 * @uA_load: load current
2580 *
2581 * Notifies the regulator core of a new device load. This is then used by
2582 * DRMS (if enabled by constraints) to set the most efficient regulator
2583 * operating mode for the new regulator loading.
2584 *
2585 * Consumer devices notify their supply regulator of the maximum power
2586 * they will require (can be taken from device datasheet in the power
2587 * consumption tables) when they change operational status and hence power
2588 * state. Examples of operational state changes that can affect power
2589 * consumption are :-
2590 *
2591 * o Device is opened / closed.
2592 * o Device I/O is about to begin or has just finished.
2593 * o Device is idling in between work.
2594 *
2595 * This information is also exported via sysfs to userspace.
2596 *
2597 * DRMS will sum the total requested load on the regulator and change
2598 * to the most efficient operating mode if platform constraints allow.
2599 *
2600 * Returns the new regulator mode or error.
2601 */
2602int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2603{
2604 struct regulator_dev *rdev = regulator->rdev;
2605 struct regulator *consumer;
2606 int ret, output_uV, input_uV, total_uA_load = 0;
2607 unsigned int mode;
2608
2609 mutex_lock(&rdev->mutex);
2610
a4b41483
MB		 2611 /*
2612 * first check to see if we can set modes at all, otherwise just
2613 * tell the consumer everything is OK.
2614 */
414c70cb
LG		 2615 regulator->uA_load = uA_load;
2616 ret = regulator_check_drms(rdev);
a4b41483
MB		 2617 if (ret < 0) {
2618 ret = 0;
414c70cb 2619 goto out;
a4b41483 2620 }
414c70cb 2621
414c70cb
LG		 2622 if (!rdev->desc->ops->get_optimum_mode)
2623 goto out;
2624
a4b41483
MB		 2625 /*
2626 * we can actually do this so any errors are indicators of
2627 * potential real failure.
2628 */
2629 ret = -EINVAL;
2630
854ccbae
AL		 2631 if (!rdev->desc->ops->set_mode)
2632 goto out;
2633
414c70cb 2634 /* get output voltage */
1bf5a1f8 2635 output_uV = _regulator_get_voltage(rdev);
414c70cb 2636 if (output_uV <= 0) {
5da84fd9 2637 rdev_err(rdev, "invalid output voltage found\n");
414c70cb
LG		 2638 goto out;
2639 }
2640
2641 /* get input voltage */
1bf5a1f8
MB		 2642 input_uV = 0;
2643 if (rdev->supply)
3801b86a 2644 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 2645 if (input_uV <= 0)
414c70cb
LG		 2646 input_uV = rdev->constraints->input_uV;
2647 if (input_uV <= 0) {
5da84fd9 2648 rdev_err(rdev, "invalid input voltage found\n");
414c70cb
LG		 2649 goto out;
2650 }
2651
2652 /* calc total requested load for this regulator */
2653 list_for_each_entry(consumer, &rdev->consumer_list, list)
fa2984d4 2654 total_uA_load += consumer->uA_load;
414c70cb
LG		 2655
2656 mode = rdev->desc->ops->get_optimum_mode(rdev,
2657 input_uV, output_uV,
2658 total_uA_load);
2c608234 2659 ret = regulator_mode_constrain(rdev, &mode);
e573520b 2660 if (ret < 0) {
5da84fd9
JP		 2661 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2662 total_uA_load, input_uV, output_uV);
414c70cb
LG		 2663 goto out;
2664 }
2665
2666 ret = rdev->desc->ops->set_mode(rdev, mode);
e573520b 2667 if (ret < 0) {
5da84fd9 2668 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
414c70cb
LG		 2669 goto out;
2670 }
2671 ret = mode;
2672out:
2673 mutex_unlock(&rdev->mutex);
2674 return ret;
2675}
2676EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2677
2678/**
2679 * regulator_register_notifier - register regulator event notifier
2680 * @regulator: regulator source
69279fb9 2681 * @nb: notifier block
414c70cb
LG		 2682 *
2683 * Register notifier block to receive regulator events.
2684 */
2685int regulator_register_notifier(struct regulator *regulator,
2686 struct notifier_block *nb)
2687{
2688 return blocking_notifier_chain_register(&regulator->rdev->notifier,
2689 nb);
2690}
2691EXPORT_SYMBOL_GPL(regulator_register_notifier);
2692
2693/**
2694 * regulator_unregister_notifier - unregister regulator event notifier
2695 * @regulator: regulator source
69279fb9 2696 * @nb: notifier block
414c70cb
LG		 2697 *
2698 * Unregister regulator event notifier block.
2699 */
2700int regulator_unregister_notifier(struct regulator *regulator,
2701 struct notifier_block *nb)
2702{
2703 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2704 nb);
2705}
2706EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2707
b136fb44
JC		 2708/* notify regulator consumers and downstream regulator consumers.
2709 * Note mutex must be held by caller.
2710 */
414c70cb
LG		 2711static void _notifier_call_chain(struct regulator_dev *rdev,
2712 unsigned long event, void *data)
2713{
414c70cb 2714 /* call rdev chain first */
414c70cb 2715 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
414c70cb
LG		 2716}
2717
2718/**
2719 * regulator_bulk_get - get multiple regulator consumers
2720 *
2721 * @dev: Device to supply
2722 * @num_consumers: Number of consumers to register
2723 * @consumers: Configuration of consumers; clients are stored here.
2724 *
2725 * @return 0 on success, an errno on failure.
2726 *
2727 * This helper function allows drivers to get several regulator
2728 * consumers in one operation. If any of the regulators cannot be
2729 * acquired then any regulators that were allocated will be freed
2730 * before returning to the caller.
2731 */
2732int regulator_bulk_get(struct device *dev, int num_consumers,
2733 struct regulator_bulk_data *consumers)
2734{
2735 int i;
2736 int ret;
2737
2738 for (i = 0; i < num_consumers; i++)
2739 consumers[i].consumer = NULL;
2740
2741 for (i = 0; i < num_consumers; i++) {
2742 consumers[i].consumer = regulator_get(dev,
2743 consumers[i].supply);
2744 if (IS_ERR(consumers[i].consumer)) {
414c70cb 2745 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 2746 dev_err(dev, "Failed to get supply '%s': %d\n",
2747 consumers[i].supply, ret);
414c70cb
LG		 2748 consumers[i].consumer = NULL;
2749 goto err;
2750 }
2751 }
2752
2753 return 0;
2754
2755err:
b29c7690 2756 while (--i >= 0)
414c70cb
LG		 2757 regulator_put(consumers[i].consumer);
2758
2759 return ret;
2760}
2761EXPORT_SYMBOL_GPL(regulator_bulk_get);
2762
e6e74030
MB		 2763/**
2764 * devm_regulator_bulk_get - managed get multiple regulator consumers
2765 *
2766 * @dev: Device to supply
2767 * @num_consumers: Number of consumers to register
2768 * @consumers: Configuration of consumers; clients are stored here.
2769 *
2770 * @return 0 on success, an errno on failure.
2771 *
2772 * This helper function allows drivers to get several regulator
2773 * consumers in one operation with management, the regulators will
2774 * automatically be freed when the device is unbound. If any of the
2775 * regulators cannot be acquired then any regulators that were
2776 * allocated will be freed before returning to the caller.
2777 */
2778int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2779 struct regulator_bulk_data *consumers)
2780{
2781 int i;
2782 int ret;
2783
2784 for (i = 0; i < num_consumers; i++)
2785 consumers[i].consumer = NULL;
2786
2787 for (i = 0; i < num_consumers; i++) {
2788 consumers[i].consumer = devm_regulator_get(dev,
2789 consumers[i].supply);
2790 if (IS_ERR(consumers[i].consumer)) {
2791 ret = PTR_ERR(consumers[i].consumer);
2792 dev_err(dev, "Failed to get supply '%s': %d\n",
2793 consumers[i].supply, ret);
2794 consumers[i].consumer = NULL;
2795 goto err;
2796 }
2797 }
2798
2799 return 0;
2800
2801err:
2802 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2803 devm_regulator_put(consumers[i].consumer);
2804
2805 return ret;
2806}
2807EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2808
f21e0e81
MB		 2809static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2810{
2811 struct regulator_bulk_data *bulk = data;
2812
2813 bulk->ret = regulator_enable(bulk->consumer);
2814}
2815
414c70cb
LG		 2816/**
2817 * regulator_bulk_enable - enable multiple regulator consumers
2818 *
2819 * @num_consumers: Number of consumers
2820 * @consumers: Consumer data; clients are stored here.
2821 * @return 0 on success, an errno on failure
2822 *
2823 * This convenience API allows consumers to enable multiple regulator
2824 * clients in a single API call. If any consumers cannot be enabled
2825 * then any others that were enabled will be disabled again prior to
2826 * return.
2827 */
2828int regulator_bulk_enable(int num_consumers,
2829 struct regulator_bulk_data *consumers)
2830{
f21e0e81 2831 LIST_HEAD(async_domain);
414c70cb 2832 int i;
f21e0e81 2833 int ret = 0;
414c70cb 2834
6492bc1b
MB		 2835 for (i = 0; i < num_consumers; i++) {
2836 if (consumers[i].consumer->always_on)
2837 consumers[i].ret = 0;
2838 else
2839 async_schedule_domain(regulator_bulk_enable_async,
2840 &consumers[i], &async_domain);
2841 }
f21e0e81
MB		 2842
2843 async_synchronize_full_domain(&async_domain);
2844
2845 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 2846 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 2847 if (consumers[i].ret != 0) {
2848 ret = consumers[i].ret;
414c70cb 2849 goto err;
f21e0e81 2850 }
414c70cb
LG		 2851 }
2852
2853 return 0;
2854
2855err:
b29c7690
AL		 2856 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2857 while (--i >= 0)
2858 regulator_disable(consumers[i].consumer);
414c70cb
LG		 2859
2860 return ret;
2861}
2862EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2863
2864/**
2865 * regulator_bulk_disable - disable multiple regulator consumers
2866 *
2867 * @num_consumers: Number of consumers
2868 * @consumers: Consumer data; clients are stored here.
2869 * @return 0 on success, an errno on failure
2870 *
2871 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 2872 * clients in a single API call. If any consumers cannot be disabled
2873 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 2874 * return.
2875 */
2876int regulator_bulk_disable(int num_consumers,
2877 struct regulator_bulk_data *consumers)
2878{
2879 int i;
01e86f49 2880 int ret, r;
414c70cb 2881
49e22632 2882 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 2883 ret = regulator_disable(consumers[i].consumer);
2884 if (ret != 0)
2885 goto err;
2886 }
2887
2888 return 0;
2889
2890err:
5da84fd9 2891 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
01e86f49
MB		 2892 for (++i; i < num_consumers; ++i) {
2893 r = regulator_enable(consumers[i].consumer);
2894 if (r != 0)
2895 pr_err("Failed to reename %s: %d\n",
2896 consumers[i].supply, r);
2897 }
414c70cb
LG		 2898
2899 return ret;
2900}
2901EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2902
e1de2f42
DK		 2903/**
2904 * regulator_bulk_force_disable - force disable multiple regulator consumers
2905 *
2906 * @num_consumers: Number of consumers
2907 * @consumers: Consumer data; clients are stored here.
2908 * @return 0 on success, an errno on failure
2909 *
2910 * This convenience API allows consumers to forcibly disable multiple regulator
2911 * clients in a single API call.
2912 * NOTE: This should be used for situations when device damage will
2913 * likely occur if the regulators are not disabled (e.g. over temp).
2914 * Although regulator_force_disable function call for some consumers can
2915 * return error numbers, the function is called for all consumers.
2916 */
2917int regulator_bulk_force_disable(int num_consumers,
2918 struct regulator_bulk_data *consumers)
2919{
2920 int i;
2921 int ret;
2922
2923 for (i = 0; i < num_consumers; i++)
2924 consumers[i].ret =
2925 regulator_force_disable(consumers[i].consumer);
2926
2927 for (i = 0; i < num_consumers; i++) {
2928 if (consumers[i].ret != 0) {
2929 ret = consumers[i].ret;
2930 goto out;
2931 }
2932 }
2933
2934 return 0;
2935out:
2936 return ret;
2937}
2938EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
2939
414c70cb
LG		 2940/**
2941 * regulator_bulk_free - free multiple regulator consumers
2942 *
2943 * @num_consumers: Number of consumers
2944 * @consumers: Consumer data; clients are stored here.
2945 *
2946 * This convenience API allows consumers to free multiple regulator
2947 * clients in a single API call.
2948 */
2949void regulator_bulk_free(int num_consumers,
2950 struct regulator_bulk_data *consumers)
2951{
2952 int i;
2953
2954 for (i = 0; i < num_consumers; i++) {
2955 regulator_put(consumers[i].consumer);
2956 consumers[i].consumer = NULL;
2957 }
2958}
2959EXPORT_SYMBOL_GPL(regulator_bulk_free);
2960
2961/**
2962 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 2963 * @rdev: regulator source
414c70cb 2964 * @event: notifier block
69279fb9 2965 * @data: callback-specific data.
414c70cb
LG		 2966 *
2967 * Called by regulator drivers to notify clients a regulator event has
2968 * occurred. We also notify regulator clients downstream.
b136fb44 2969 * Note lock must be held by caller.
414c70cb
LG		 2970 */
2971int regulator_notifier_call_chain(struct regulator_dev *rdev,
2972 unsigned long event, void *data)
2973{
2974 _notifier_call_chain(rdev, event, data);
2975 return NOTIFY_DONE;
2976
2977}
2978EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2979
be721979
MB		 2980/**
2981 * regulator_mode_to_status - convert a regulator mode into a status
2982 *
2983 * @mode: Mode to convert
2984 *
2985 * Convert a regulator mode into a status.
2986 */
2987int regulator_mode_to_status(unsigned int mode)
2988{
2989 switch (mode) {
2990 case REGULATOR_MODE_FAST:
2991 return REGULATOR_STATUS_FAST;
2992 case REGULATOR_MODE_NORMAL:
2993 return REGULATOR_STATUS_NORMAL;
2994 case REGULATOR_MODE_IDLE:
2995 return REGULATOR_STATUS_IDLE;
2996 case REGULATOR_STATUS_STANDBY:
2997 return REGULATOR_STATUS_STANDBY;
2998 default:
2999 return 0;
3000 }
3001}
3002EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3003
7ad68e2f
DB		 3004/*
3005 * To avoid cluttering sysfs (and memory) with useless state, only
3006 * create attributes that can be meaningfully displayed.
3007 */
3008static int add_regulator_attributes(struct regulator_dev *rdev)
3009{
3010 struct device *dev = &rdev->dev;
3011 struct regulator_ops *ops = rdev->desc->ops;
3012 int status = 0;
3013
3014 /* some attributes need specific methods to be displayed */
4c78899b
MB		 3015 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3016 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
7ad68e2f
DB		 3017 status = device_create_file(dev, &dev_attr_microvolts);
3018 if (status < 0)
3019 return status;
3020 }
3021 if (ops->get_current_limit) {
3022 status = device_create_file(dev, &dev_attr_microamps);
3023 if (status < 0)
3024 return status;
3025 }
3026 if (ops->get_mode) {
3027 status = device_create_file(dev, &dev_attr_opmode);
3028 if (status < 0)
3029 return status;
3030 }
3031 if (ops->is_enabled) {
3032 status = device_create_file(dev, &dev_attr_state);
3033 if (status < 0)
3034 return status;
3035 }
853116a1
DB		 3036 if (ops->get_status) {
3037 status = device_create_file(dev, &dev_attr_status);
3038 if (status < 0)
3039 return status;
3040 }
7ad68e2f
DB		 3041
3042 /* some attributes are type-specific */
3043 if (rdev->desc->type == REGULATOR_CURRENT) {
3044 status = device_create_file(dev, &dev_attr_requested_microamps);
3045 if (status < 0)
3046 return status;
3047 }
3048
3049 /* all the other attributes exist to support constraints;
3050 * don't show them if there are no constraints, or if the
3051 * relevant supporting methods are missing.
3052 */
3053 if (!rdev->constraints)
3054 return status;
3055
3056 /* constraints need specific supporting methods */
e8eef82b 3057 if (ops->set_voltage || ops->set_voltage_sel) {
7ad68e2f
DB		 3058 status = device_create_file(dev, &dev_attr_min_microvolts);
3059 if (status < 0)
3060 return status;
3061 status = device_create_file(dev, &dev_attr_max_microvolts);
3062 if (status < 0)
3063 return status;
3064 }
3065 if (ops->set_current_limit) {
3066 status = device_create_file(dev, &dev_attr_min_microamps);
3067 if (status < 0)
3068 return status;
3069 status = device_create_file(dev, &dev_attr_max_microamps);
3070 if (status < 0)
3071 return status;
3072 }
3073
7ad68e2f
DB		 3074 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3075 if (status < 0)
3076 return status;
3077 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3078 if (status < 0)
3079 return status;
3080 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3081 if (status < 0)
3082 return status;
3083
3084 if (ops->set_suspend_voltage) {
3085 status = device_create_file(dev,
3086 &dev_attr_suspend_standby_microvolts);
3087 if (status < 0)
3088 return status;
3089 status = device_create_file(dev,
3090 &dev_attr_suspend_mem_microvolts);
3091 if (status < 0)
3092 return status;
3093 status = device_create_file(dev,
3094 &dev_attr_suspend_disk_microvolts);
3095 if (status < 0)
3096 return status;
3097 }
3098
3099 if (ops->set_suspend_mode) {
3100 status = device_create_file(dev,
3101 &dev_attr_suspend_standby_mode);
3102 if (status < 0)
3103 return status;
3104 status = device_create_file(dev,
3105 &dev_attr_suspend_mem_mode);
3106 if (status < 0)
3107 return status;
3108 status = device_create_file(dev,
3109 &dev_attr_suspend_disk_mode);
3110 if (status < 0)
3111 return status;
3112 }
3113
3114 return status;
3115}
3116
1130e5b3
MB		 3117static void rdev_init_debugfs(struct regulator_dev *rdev)
3118{
1130e5b3 3119 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
24751434 3120 if (!rdev->debugfs) {
1130e5b3 3121 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 3122 return;
3123 }
3124
3125 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3126 &rdev->use_count);
3127 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3128 &rdev->open_count);
1130e5b3
MB		 3129}
3130
414c70cb
LG		 3131/**
3132 * regulator_register - register regulator
69279fb9 3133 * @regulator_desc: regulator to register
c172708d 3134 * @config: runtime configuration for regulator
414c70cb
LG		 3135 *
3136 * Called by regulator drivers to register a regulator.
3137 * Returns 0 on success.
3138 */
65f26846
MB		 3139struct regulator_dev *
3140regulator_register(const struct regulator_desc *regulator_desc,
c172708d 3141 const struct regulator_config *config)
414c70cb 3142{
9a8f5e07 3143 const struct regulation_constraints *constraints = NULL;
c172708d 3144 const struct regulator_init_data *init_data;
414c70cb
LG		 3145 static atomic_t regulator_no = ATOMIC_INIT(0);
3146 struct regulator_dev *rdev;
32c8fad4 3147 struct device *dev;
a5766f11 3148 int ret, i;
69511a45 3149 const char *supply = NULL;
414c70cb 3150
c172708d 3151 if (regulator_desc == NULL || config == NULL)
414c70cb
LG		 3152 return ERR_PTR(-EINVAL);
3153
32c8fad4 3154 dev = config->dev;
dcf70112 3155 WARN_ON(!dev);
32c8fad4 3156
414c70cb
LG		 3157 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3158 return ERR_PTR(-EINVAL);
3159
cd78dfc6
DL		 3160 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3161 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 3162 return ERR_PTR(-EINVAL);
3163
476c2d83
MB		 3164 /* Only one of each should be implemented */
3165 WARN_ON(regulator_desc->ops->get_voltage &&
3166 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 3167 WARN_ON(regulator_desc->ops->set_voltage &&
3168 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 3169
3170 /* If we're using selectors we must implement list_voltage. */
3171 if (regulator_desc->ops->get_voltage_sel &&
3172 !regulator_desc->ops->list_voltage) {
3173 return ERR_PTR(-EINVAL);
3174 }
e8eef82b
MB		 3175 if (regulator_desc->ops->set_voltage_sel &&
3176 !regulator_desc->ops->list_voltage) {
3177 return ERR_PTR(-EINVAL);
3178 }
476c2d83 3179
c172708d
MB		 3180 init_data = config->init_data;
3181
414c70cb
LG		 3182 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3183 if (rdev == NULL)
3184 return ERR_PTR(-ENOMEM);
3185
3186 mutex_lock(&regulator_list_mutex);
3187
3188 mutex_init(&rdev->mutex);
c172708d 3189 rdev->reg_data = config->driver_data;
414c70cb
LG		 3190 rdev->owner = regulator_desc->owner;
3191 rdev->desc = regulator_desc;
3a4b0a07
MB		 3192 if (config->regmap)
3193 rdev->regmap = config->regmap;
3194 else
3195 rdev->regmap = dev_get_regmap(dev, NULL);
414c70cb 3196 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 3197 INIT_LIST_HEAD(&rdev->list);
414c70cb 3198 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 3199 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 3200
a5766f11 3201 /* preform any regulator specific init */
9a8f5e07 3202 if (init_data && init_data->regulator_init) {
a5766f11 3203 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 3204 if (ret < 0)
3205 goto clean;
a5766f11
LG		 3206 }
3207
a5766f11 3208 /* register with sysfs */
414c70cb 3209 rdev->dev.class = &regulator_class;
c172708d 3210 rdev->dev.of_node = config->of_node;
a5766f11 3211 rdev->dev.parent = dev;
812460a9
KS		 3212 dev_set_name(&rdev->dev, "regulator.%d",
3213 atomic_inc_return(&regulator_no) - 1);
a5766f11 3214 ret = device_register(&rdev->dev);
ad7725cb
VK		 3215 if (ret != 0) {
3216 put_device(&rdev->dev);
4fca9545 3217 goto clean;
ad7725cb 3218 }
a5766f11
LG		 3219
3220 dev_set_drvdata(&rdev->dev, rdev);
3221
74f544c1 3222 /* set regulator constraints */
9a8f5e07
MB		 3223 if (init_data)
3224 constraints = &init_data->constraints;
3225
3226 ret = set_machine_constraints(rdev, constraints);
74f544c1
MR		 3227 if (ret < 0)
3228 goto scrub;
3229
7ad68e2f
DB		 3230 /* add attributes supported by this regulator */
3231 ret = add_regulator_attributes(rdev);
3232 if (ret < 0)
3233 goto scrub;
3234
9a8f5e07 3235 if (init_data && init_data->supply_regulator)
69511a45
RN		 3236 supply = init_data->supply_regulator;
3237 else if (regulator_desc->supply_name)
3238 supply = regulator_desc->supply_name;
3239
3240 if (supply) {
0178f3e2 3241 struct regulator_dev *r;
0178f3e2 3242
6d191a5f 3243 r = regulator_dev_lookup(dev, supply, &ret);
0178f3e2 3244
69511a45
RN		 3245 if (!r) {
3246 dev_err(dev, "Failed to find supply %s\n", supply);
04bf3011 3247 ret = -EPROBE_DEFER;
0178f3e2
MB		 3248 goto scrub;
3249 }
3250
3251 ret = set_supply(rdev, r);
3252 if (ret < 0)
3253 goto scrub;
b2296bd4
LD		 3254
3255 /* Enable supply if rail is enabled */
b1a86831 3256 if (_regulator_is_enabled(rdev)) {
b2296bd4
LD		 3257 ret = regulator_enable(rdev->supply);
3258 if (ret < 0)
3259 goto scrub;
3260 }
0178f3e2
MB		 3261 }
3262
a5766f11 3263 /* add consumers devices */
9a8f5e07
MB		 3264 if (init_data) {
3265 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3266 ret = set_consumer_device_supply(rdev,
9a8f5e07 3267 init_data->consumer_supplies[i].dev_name,
23c2f041 3268 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 3269 if (ret < 0) {
3270 dev_err(dev, "Failed to set supply %s\n",
3271 init_data->consumer_supplies[i].supply);
3272 goto unset_supplies;
3273 }
23c2f041 3274 }
414c70cb 3275 }
a5766f11
LG		 3276
3277 list_add(&rdev->list, &regulator_list);
1130e5b3
MB		 3278
3279 rdev_init_debugfs(rdev);
a5766f11 3280out:
414c70cb
LG		 3281 mutex_unlock(&regulator_list_mutex);
3282 return rdev;
4fca9545 3283
d4033b54
JN		 3284unset_supplies:
3285 unset_regulator_supplies(rdev);
3286
4fca9545 3287scrub:
e81dba85
MB		 3288 if (rdev->supply)
3289 regulator_put(rdev->supply);
1a6958e7 3290 kfree(rdev->constraints);
4fca9545 3291 device_unregister(&rdev->dev);
53032daf
PW		 3292 /* device core frees rdev */
3293 rdev = ERR_PTR(ret);
3294 goto out;
3295
4fca9545
DB		 3296clean:
3297 kfree(rdev);
3298 rdev = ERR_PTR(ret);
3299 goto out;
414c70cb
LG		 3300}
3301EXPORT_SYMBOL_GPL(regulator_register);
3302
3303/**
3304 * regulator_unregister - unregister regulator
69279fb9 3305 * @rdev: regulator to unregister
414c70cb
LG		 3306 *
3307 * Called by regulator drivers to unregister a regulator.
3308 */
3309void regulator_unregister(struct regulator_dev *rdev)
3310{
3311 if (rdev == NULL)
3312 return;
3313
e032b376
MB		 3314 if (rdev->supply)
3315 regulator_put(rdev->supply);
414c70cb 3316 mutex_lock(&regulator_list_mutex);
1130e5b3 3317 debugfs_remove_recursive(rdev->debugfs);
da07ecd9 3318 flush_work_sync(&rdev->disable_work.work);
6bf87d17 3319 WARN_ON(rdev->open_count);
0f1d747b 3320 unset_regulator_supplies(rdev);
414c70cb 3321 list_del(&rdev->list);
f8c12fe3 3322 kfree(rdev->constraints);
58fb5cf5 3323 device_unregister(&rdev->dev);
414c70cb
LG		 3324 mutex_unlock(&regulator_list_mutex);
3325}
3326EXPORT_SYMBOL_GPL(regulator_unregister);
3327
414c70cb 3328/**
cf7bbcdf 3329 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 3330 * @state: system suspend state
3331 *
3332 * Configure each regulator with it's suspend operating parameters for state.
3333 * This will usually be called by machine suspend code prior to supending.
3334 */
3335int regulator_suspend_prepare(suspend_state_t state)
3336{
3337 struct regulator_dev *rdev;
3338 int ret = 0;
3339
3340 /* ON is handled by regulator active state */
3341 if (state == PM_SUSPEND_ON)
3342 return -EINVAL;
3343
3344 mutex_lock(&regulator_list_mutex);
3345 list_for_each_entry(rdev, &regulator_list, list) {
3346
3347 mutex_lock(&rdev->mutex);
3348 ret = suspend_prepare(rdev, state);
3349 mutex_unlock(&rdev->mutex);
3350
3351 if (ret < 0) {
5da84fd9 3352 rdev_err(rdev, "failed to prepare\n");
414c70cb
LG		 3353 goto out;
3354 }
3355 }
3356out:
3357 mutex_unlock(&regulator_list_mutex);
3358 return ret;
3359}
3360EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3361
7a32b589
MH		 3362/**
3363 * regulator_suspend_finish - resume regulators from system wide suspend
3364 *
3365 * Turn on regulators that might be turned off by regulator_suspend_prepare
3366 * and that should be turned on according to the regulators properties.
3367 */
3368int regulator_suspend_finish(void)
3369{
3370 struct regulator_dev *rdev;
3371 int ret = 0, error;
3372
3373 mutex_lock(&regulator_list_mutex);
3374 list_for_each_entry(rdev, &regulator_list, list) {
3375 struct regulator_ops *ops = rdev->desc->ops;
3376
3377 mutex_lock(&rdev->mutex);
3378 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3379 ops->enable) {
3380 error = ops->enable(rdev);
3381 if (error)
3382 ret = error;
3383 } else {
3384 if (!has_full_constraints)
3385 goto unlock;
3386 if (!ops->disable)
3387 goto unlock;
b1a86831 3388 if (!_regulator_is_enabled(rdev))
7a32b589
MH		 3389 goto unlock;
3390
3391 error = ops->disable(rdev);
3392 if (error)
3393 ret = error;
3394 }
3395unlock:
3396 mutex_unlock(&rdev->mutex);
3397 }
3398 mutex_unlock(&regulator_list_mutex);
3399 return ret;
3400}
3401EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3402
ca725561
MB		 3403/**
3404 * regulator_has_full_constraints - the system has fully specified constraints
3405 *
3406 * Calling this function will cause the regulator API to disable all
3407 * regulators which have a zero use count and don't have an always_on
3408 * constraint in a late_initcall.
3409 *
3410 * The intention is that this will become the default behaviour in a
3411 * future kernel release so users are encouraged to use this facility
3412 * now.
3413 */
3414void regulator_has_full_constraints(void)
3415{
3416 has_full_constraints = 1;
3417}
3418EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3419
688fe99a
MB		 3420/**
3421 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3422 *
3423 * Calling this function will cause the regulator API to provide a
3424 * dummy regulator to consumers if no physical regulator is found,
3425 * allowing most consumers to proceed as though a regulator were
3426 * configured. This allows systems such as those with software
3427 * controllable regulators for the CPU core only to be brought up more
3428 * readily.
3429 */
3430void regulator_use_dummy_regulator(void)
3431{
3432 board_wants_dummy_regulator = true;
3433}
3434EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3435
414c70cb
LG		 3436/**
3437 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 3438 * @rdev: regulator
414c70cb
LG		 3439 *
3440 * Get rdev regulator driver private data. This call can be used in the
3441 * regulator driver context.
3442 */
3443void *rdev_get_drvdata(struct regulator_dev *rdev)
3444{
3445 return rdev->reg_data;
3446}
3447EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3448
3449/**
3450 * regulator_get_drvdata - get regulator driver data
3451 * @regulator: regulator
3452 *
3453 * Get regulator driver private data. This call can be used in the consumer
3454 * driver context when non API regulator specific functions need to be called.
3455 */
3456void *regulator_get_drvdata(struct regulator *regulator)
3457{
3458 return regulator->rdev->reg_data;
3459}
3460EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3461
3462/**
3463 * regulator_set_drvdata - set regulator driver data
3464 * @regulator: regulator
3465 * @data: data
3466 */
3467void regulator_set_drvdata(struct regulator *regulator, void *data)
3468{
3469 regulator->rdev->reg_data = data;
3470}
3471EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3472
3473/**
3474 * regulator_get_id - get regulator ID
69279fb9 3475 * @rdev: regulator
414c70cb
LG		 3476 */
3477int rdev_get_id(struct regulator_dev *rdev)
3478{
3479 return rdev->desc->id;
3480}
3481EXPORT_SYMBOL_GPL(rdev_get_id);
3482
a5766f11
LG		 3483struct device *rdev_get_dev(struct regulator_dev *rdev)
3484{
3485 return &rdev->dev;
3486}
3487EXPORT_SYMBOL_GPL(rdev_get_dev);
3488
3489void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3490{
3491 return reg_init_data->driver_data;
3492}
3493EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3494
ba55a974
MB		 3495#ifdef CONFIG_DEBUG_FS
3496static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3497 size_t count, loff_t *ppos)
3498{
3499 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3500 ssize_t len, ret = 0;
3501 struct regulator_map *map;
3502
3503 if (!buf)
3504 return -ENOMEM;
3505
3506 list_for_each_entry(map, &regulator_map_list, list) {
3507 len = snprintf(buf + ret, PAGE_SIZE - ret,
3508 "%s -> %s.%s\n",
3509 rdev_get_name(map->regulator), map->dev_name,
3510 map->supply);
3511 if (len >= 0)
3512 ret += len;
3513 if (ret > PAGE_SIZE) {
3514 ret = PAGE_SIZE;
3515 break;
3516 }
3517 }
3518
3519 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3520
3521 kfree(buf);
3522
3523 return ret;
3524}
24751434 3525#endif
ba55a974
MB		 3526
3527static const struct file_operations supply_map_fops = {
24751434 3528#ifdef CONFIG_DEBUG_FS
ba55a974
MB		 3529 .read = supply_map_read_file,
3530 .llseek = default_llseek,
ba55a974 3531#endif
24751434 3532};
ba55a974 3533
414c70cb
LG		 3534static int __init regulator_init(void)
3535{
34abbd68
MB		 3536 int ret;
3537
34abbd68
MB		 3538 ret = class_register(&regulator_class);
3539
1130e5b3 3540 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 3541 if (!debugfs_root)
1130e5b3 3542 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 3543
f4d562c6
MB		 3544 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3545 &supply_map_fops);
1130e5b3 3546
34abbd68
MB		 3547 regulator_dummy_init();
3548
3549 return ret;
414c70cb
LG		 3550}
3551
3552/* init early to allow our consumers to complete system booting */
3553core_initcall(regulator_init);
ca725561
MB		 3554
3555static int __init regulator_init_complete(void)
3556{
3557 struct regulator_dev *rdev;
3558 struct regulator_ops *ops;
3559 struct regulation_constraints *c;
3560 int enabled, ret;
ca725561
MB		 3561
3562 mutex_lock(&regulator_list_mutex);
3563
3564 /* If we have a full configuration then disable any regulators
3565 * which are not in use or always_on. This will become the
3566 * default behaviour in the future.
3567 */
3568 list_for_each_entry(rdev, &regulator_list, list) {
3569 ops = rdev->desc->ops;
3570 c = rdev->constraints;
3571
f25e0b4f 3572 if (!ops->disable || (c && c->always_on))
ca725561
MB		 3573 continue;
3574
3575 mutex_lock(&rdev->mutex);
3576
3577 if (rdev->use_count)
3578 goto unlock;
3579
3580 /* If we can't read the status assume it's on. */
3581 if (ops->is_enabled)
3582 enabled = ops->is_enabled(rdev);
3583 else
3584 enabled = 1;
3585
3586 if (!enabled)
3587 goto unlock;
3588
3589 if (has_full_constraints) {
3590 /* We log since this may kill the system if it
3591 * goes wrong. */
5da84fd9 3592 rdev_info(rdev, "disabling\n");
ca725561
MB		 3593 ret = ops->disable(rdev);
3594 if (ret != 0) {
5da84fd9 3595 rdev_err(rdev, "couldn't disable: %d\n", ret);
ca725561
MB		 3596 }
3597 } else {
3598 /* The intention is that in future we will
3599 * assume that full constraints are provided
3600 * so warn even if we aren't going to do
3601 * anything here.
3602 */
5da84fd9 3603 rdev_warn(rdev, "incomplete constraints, leaving on\n");
ca725561
MB		 3604 }
3605
3606unlock:
3607 mutex_unlock(&rdev->mutex);
3608 }
3609
3610 mutex_unlock(&regulator_list_mutex);
3611
3612 return 0;
3613}
3614late_initcall(regulator_init_complete);
Linux 6.x block layer and io_uring tree(s)