projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
regulator: core: Fast path non-deferred disables
[linux-2.6-block.git] / drivers / regulator / core.c
CommitLineData
414c70cb
LG		 1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
a5766f11 5 * Copyright 2008 SlimLogic Ltd.
414c70cb 6 *
a5766f11 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
414c70cb
LG		 8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
1130e5b3 18#include <linux/debugfs.h>
414c70cb 19#include <linux/device.h>
5a0e3ad6 20#include <linux/slab.h>
f21e0e81 21#include <linux/async.h>
414c70cb
LG		 22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
31aae2be 25#include <linux/delay.h>
65f73508 26#include <linux/gpio.h>
69511a45 27#include <linux/of.h>
65b19ce6 28#include <linux/regmap.h>
69511a45 29#include <linux/regulator/of_regulator.h>
414c70cb
LG		 30#include <linux/regulator/consumer.h>
31#include <linux/regulator/driver.h>
32#include <linux/regulator/machine.h>
65602c32 33#include <linux/module.h>
414c70cb 34
02fa3ec0
MB		 35#define CREATE_TRACE_POINTS
36#include <trace/events/regulator.h>
37
34abbd68
MB		 38#include "dummy.h"
39
7d51a0db
MB		 40#define rdev_crit(rdev, fmt, ...) \
41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
5da84fd9
JP		 42#define rdev_err(rdev, fmt, ...) \
43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44#define rdev_warn(rdev, fmt, ...) \
45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_info(rdev, fmt, ...) \
47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_dbg(rdev, fmt, ...) \
49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50
414c70cb
LG		 51static DEFINE_MUTEX(regulator_list_mutex);
52static LIST_HEAD(regulator_list);
53static LIST_HEAD(regulator_map_list);
21cf891a 54static bool has_full_constraints;
688fe99a 55static bool board_wants_dummy_regulator;
414c70cb 56
1130e5b3 57static struct dentry *debugfs_root;
1130e5b3 58
8dc5390d 59/*
414c70cb
LG		 60 * struct regulator_map
61 *
62 * Used to provide symbolic supply names to devices.
63 */
64struct regulator_map {
65 struct list_head list;
40f9244f 66 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 67 const char *supply;
a5766f11 68 struct regulator_dev *regulator;
414c70cb
LG		 69};
70
414c70cb
LG		 71/*
72 * struct regulator
73 *
74 * One for each consumer device.
75 */
76struct regulator {
77 struct device *dev;
78 struct list_head list;
6492bc1b 79 unsigned int always_on:1;
414c70cb
LG		 80 int uA_load;
81 int min_uV;
82 int max_uV;
414c70cb
LG		 83 char *supply_name;
84 struct device_attribute dev_attr;
85 struct regulator_dev *rdev;
5de70519 86 struct dentry *debugfs;
414c70cb
LG		 87};
88
89static int _regulator_is_enabled(struct regulator_dev *rdev);
3801b86a 90static int _regulator_disable(struct regulator_dev *rdev);
414c70cb
LG		 91static int _regulator_get_voltage(struct regulator_dev *rdev);
92static int _regulator_get_current_limit(struct regulator_dev *rdev);
93static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
94static void _notifier_call_chain(struct regulator_dev *rdev,
95 unsigned long event, void *data);
75790251
MB		 96static int _regulator_do_set_voltage(struct regulator_dev *rdev,
97 int min_uV, int max_uV);
3801b86a
MB		 98static struct regulator *create_regulator(struct regulator_dev *rdev,
99 struct device *dev,
100 const char *supply_name);
414c70cb 101
1083c393
MB		 102static const char *rdev_get_name(struct regulator_dev *rdev)
103{
104 if (rdev->constraints && rdev->constraints->name)
105 return rdev->constraints->name;
106 else if (rdev->desc->name)
107 return rdev->desc->name;
108 else
109 return "";
110}
111
69511a45
RN		 112/**
113 * of_get_regulator - get a regulator device node based on supply name
114 * @dev: Device pointer for the consumer (of regulator) device
115 * @supply: regulator supply name
116 *
117 * Extract the regulator device node corresponding to the supply name.
118 * retruns the device node corresponding to the regulator if found, else
119 * returns NULL.
120 */
121static struct device_node *of_get_regulator(struct device *dev, const char *supply)
122{
123 struct device_node *regnode = NULL;
124 char prop_name[32]; /* 32 is max size of property name */
125
126 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
127
128 snprintf(prop_name, 32, "%s-supply", supply);
129 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
130
131 if (!regnode) {
16fbcc3b 132 dev_dbg(dev, "Looking up %s property in node %s failed",
69511a45
RN		 133 prop_name, dev->of_node->full_name);
134 return NULL;
135 }
136 return regnode;
137}
138
6492bc1b
MB		 139static int _regulator_can_change_status(struct regulator_dev *rdev)
140{
141 if (!rdev->constraints)
142 return 0;
143
144 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
145 return 1;
146 else
147 return 0;
148}
149
414c70cb
LG		 150/* Platform voltage constraint check */
151static int regulator_check_voltage(struct regulator_dev *rdev,
152 int *min_uV, int *max_uV)
153{
154 BUG_ON(*min_uV > *max_uV);
155
156 if (!rdev->constraints) {
5da84fd9 157 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 158 return -ENODEV;
159 }
160 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
5da84fd9 161 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 162 return -EPERM;
163 }
164
165 if (*max_uV > rdev->constraints->max_uV)
166 *max_uV = rdev->constraints->max_uV;
167 if (*min_uV < rdev->constraints->min_uV)
168 *min_uV = rdev->constraints->min_uV;
169
89f425ed
MB		 170 if (*min_uV > *max_uV) {
171 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 172 *min_uV, *max_uV);
414c70cb 173 return -EINVAL;
89f425ed 174 }
414c70cb
LG		 175
176 return 0;
177}
178
05fda3b1
TP		 179/* Make sure we select a voltage that suits the needs of all
180 * regulator consumers
181 */
182static int regulator_check_consumers(struct regulator_dev *rdev,
183 int *min_uV, int *max_uV)
184{
185 struct regulator *regulator;
186
187 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4aa922c0
MB		 188 /*
189 * Assume consumers that didn't say anything are OK
190 * with anything in the constraint range.
191 */
192 if (!regulator->min_uV && !regulator->max_uV)
193 continue;
194
05fda3b1
TP		 195 if (*max_uV > regulator->max_uV)
196 *max_uV = regulator->max_uV;
197 if (*min_uV < regulator->min_uV)
198 *min_uV = regulator->min_uV;
199 }
200
201 if (*min_uV > *max_uV)
202 return -EINVAL;
203
204 return 0;
205}
206
414c70cb
LG		 207/* current constraint check */
208static int regulator_check_current_limit(struct regulator_dev *rdev,
209 int *min_uA, int *max_uA)
210{
211 BUG_ON(*min_uA > *max_uA);
212
213 if (!rdev->constraints) {
5da84fd9 214 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 215 return -ENODEV;
216 }
217 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
5da84fd9 218 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 219 return -EPERM;
220 }
221
222 if (*max_uA > rdev->constraints->max_uA)
223 *max_uA = rdev->constraints->max_uA;
224 if (*min_uA < rdev->constraints->min_uA)
225 *min_uA = rdev->constraints->min_uA;
226
89f425ed
MB		 227 if (*min_uA > *max_uA) {
228 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 229 *min_uA, *max_uA);
414c70cb 230 return -EINVAL;
89f425ed 231 }
414c70cb
LG		 232
233 return 0;
234}
235
236/* operating mode constraint check */
2c608234 237static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 238{
2c608234 239 switch (*mode) {
e573520b
DB		 240 case REGULATOR_MODE_FAST:
241 case REGULATOR_MODE_NORMAL:
242 case REGULATOR_MODE_IDLE:
243 case REGULATOR_MODE_STANDBY:
244 break;
245 default:
89f425ed 246 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 247 return -EINVAL;
248 }
249
414c70cb 250 if (!rdev->constraints) {
5da84fd9 251 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 252 return -ENODEV;
253 }
254 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
5da84fd9 255 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 256 return -EPERM;
257 }
2c608234
MB		 258
259 /* The modes are bitmasks, the most power hungry modes having
260 * the lowest values. If the requested mode isn't supported
261 * try higher modes. */
262 while (*mode) {
263 if (rdev->constraints->valid_modes_mask & *mode)
264 return 0;
265 *mode /= 2;
414c70cb 266 }
2c608234
MB		 267
268 return -EINVAL;
414c70cb
LG		 269}
270
271/* dynamic regulator mode switching constraint check */
272static int regulator_check_drms(struct regulator_dev *rdev)
273{
274 if (!rdev->constraints) {
5da84fd9 275 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 276 return -ENODEV;
277 }
278 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
5da84fd9 279 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 280 return -EPERM;
281 }
282 return 0;
283}
284
414c70cb
LG		 285static ssize_t regulator_uV_show(struct device *dev,
286 struct device_attribute *attr, char *buf)
287{
a5766f11 288 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 289 ssize_t ret;
290
291 mutex_lock(&rdev->mutex);
292 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
293 mutex_unlock(&rdev->mutex);
294
295 return ret;
296}
7ad68e2f 297static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 298
299static ssize_t regulator_uA_show(struct device *dev,
300 struct device_attribute *attr, char *buf)
301{
a5766f11 302 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 303
304 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
305}
7ad68e2f 306static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 307
bc558a60
MB		 308static ssize_t regulator_name_show(struct device *dev,
309 struct device_attribute *attr, char *buf)
310{
311 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 312
1083c393 313 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60
MB		 314}
315
4fca9545 316static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 317{
414c70cb
LG		 318 switch (mode) {
319 case REGULATOR_MODE_FAST:
320 return sprintf(buf, "fast\n");
321 case REGULATOR_MODE_NORMAL:
322 return sprintf(buf, "normal\n");
323 case REGULATOR_MODE_IDLE:
324 return sprintf(buf, "idle\n");
325 case REGULATOR_MODE_STANDBY:
326 return sprintf(buf, "standby\n");
327 }
328 return sprintf(buf, "unknown\n");
329}
330
4fca9545
DB		 331static ssize_t regulator_opmode_show(struct device *dev,
332 struct device_attribute *attr, char *buf)
414c70cb 333{
a5766f11 334 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 335
4fca9545
DB		 336 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
337}
7ad68e2f 338static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 339
340static ssize_t regulator_print_state(char *buf, int state)
341{
414c70cb
LG		 342 if (state > 0)
343 return sprintf(buf, "enabled\n");
344 else if (state == 0)
345 return sprintf(buf, "disabled\n");
346 else
347 return sprintf(buf, "unknown\n");
348}
349
4fca9545
DB		 350static ssize_t regulator_state_show(struct device *dev,
351 struct device_attribute *attr, char *buf)
352{
353 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 354 ssize_t ret;
355
356 mutex_lock(&rdev->mutex);
357 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
358 mutex_unlock(&rdev->mutex);
4fca9545 359
9332546f 360 return ret;
4fca9545 361}
7ad68e2f 362static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 363
853116a1
DB		 364static ssize_t regulator_status_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
366{
367 struct regulator_dev *rdev = dev_get_drvdata(dev);
368 int status;
369 char *label;
370
371 status = rdev->desc->ops->get_status(rdev);
372 if (status < 0)
373 return status;
374
375 switch (status) {
376 case REGULATOR_STATUS_OFF:
377 label = "off";
378 break;
379 case REGULATOR_STATUS_ON:
380 label = "on";
381 break;
382 case REGULATOR_STATUS_ERROR:
383 label = "error";
384 break;
385 case REGULATOR_STATUS_FAST:
386 label = "fast";
387 break;
388 case REGULATOR_STATUS_NORMAL:
389 label = "normal";
390 break;
391 case REGULATOR_STATUS_IDLE:
392 label = "idle";
393 break;
394 case REGULATOR_STATUS_STANDBY:
395 label = "standby";
396 break;
1beaf762
KG		 397 case REGULATOR_STATUS_UNDEFINED:
398 label = "undefined";
399 break;
853116a1
DB		 400 default:
401 return -ERANGE;
402 }
403
404 return sprintf(buf, "%s\n", label);
405}
406static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
407
414c70cb
LG		 408static ssize_t regulator_min_uA_show(struct device *dev,
409 struct device_attribute *attr, char *buf)
410{
a5766f11 411 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 412
413 if (!rdev->constraints)
414 return sprintf(buf, "constraint not defined\n");
415
416 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
417}
7ad68e2f 418static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 419
420static ssize_t regulator_max_uA_show(struct device *dev,
421 struct device_attribute *attr, char *buf)
422{
a5766f11 423 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 424
425 if (!rdev->constraints)
426 return sprintf(buf, "constraint not defined\n");
427
428 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
429}
7ad68e2f 430static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 431
432static ssize_t regulator_min_uV_show(struct device *dev,
433 struct device_attribute *attr, char *buf)
434{
a5766f11 435 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 436
437 if (!rdev->constraints)
438 return sprintf(buf, "constraint not defined\n");
439
440 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
441}
7ad68e2f 442static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 443
444static ssize_t regulator_max_uV_show(struct device *dev,
445 struct device_attribute *attr, char *buf)
446{
a5766f11 447 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 448
449 if (!rdev->constraints)
450 return sprintf(buf, "constraint not defined\n");
451
452 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
453}
7ad68e2f 454static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 455
456static ssize_t regulator_total_uA_show(struct device *dev,
457 struct device_attribute *attr, char *buf)
458{
a5766f11 459 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 460 struct regulator *regulator;
461 int uA = 0;
462
463 mutex_lock(&rdev->mutex);
464 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 465 uA += regulator->uA_load;
414c70cb
LG		 466 mutex_unlock(&rdev->mutex);
467 return sprintf(buf, "%d\n", uA);
468}
7ad68e2f 469static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb
LG		 470
471static ssize_t regulator_num_users_show(struct device *dev,
472 struct device_attribute *attr, char *buf)
473{
a5766f11 474 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 475 return sprintf(buf, "%d\n", rdev->use_count);
476}
477
478static ssize_t regulator_type_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
480{
a5766f11 481 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 482
483 switch (rdev->desc->type) {
484 case REGULATOR_VOLTAGE:
485 return sprintf(buf, "voltage\n");
486 case REGULATOR_CURRENT:
487 return sprintf(buf, "current\n");
488 }
489 return sprintf(buf, "unknown\n");
490}
491
492static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
493 struct device_attribute *attr, char *buf)
494{
a5766f11 495 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 496
414c70cb
LG		 497 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
498}
7ad68e2f
DB		 499static DEVICE_ATTR(suspend_mem_microvolts, 0444,
500 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 501
502static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
503 struct device_attribute *attr, char *buf)
504{
a5766f11 505 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 506
414c70cb
LG		 507 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
508}
7ad68e2f
DB		 509static DEVICE_ATTR(suspend_disk_microvolts, 0444,
510 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 511
512static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
513 struct device_attribute *attr, char *buf)
514{
a5766f11 515 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 516
414c70cb
LG		 517 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
518}
7ad68e2f
DB		 519static DEVICE_ATTR(suspend_standby_microvolts, 0444,
520 regulator_suspend_standby_uV_show, NULL);
414c70cb 521
414c70cb
LG		 522static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
523 struct device_attribute *attr, char *buf)
524{
a5766f11 525 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 526
4fca9545
DB		 527 return regulator_print_opmode(buf,
528 rdev->constraints->state_mem.mode);
414c70cb 529}
7ad68e2f
DB		 530static DEVICE_ATTR(suspend_mem_mode, 0444,
531 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 532
533static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
534 struct device_attribute *attr, char *buf)
535{
a5766f11 536 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 537
4fca9545
DB		 538 return regulator_print_opmode(buf,
539 rdev->constraints->state_disk.mode);
414c70cb 540}
7ad68e2f
DB		 541static DEVICE_ATTR(suspend_disk_mode, 0444,
542 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 543
544static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
545 struct device_attribute *attr, char *buf)
546{
a5766f11 547 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 548
4fca9545
DB		 549 return regulator_print_opmode(buf,
550 rdev->constraints->state_standby.mode);
414c70cb 551}
7ad68e2f
DB		 552static DEVICE_ATTR(suspend_standby_mode, 0444,
553 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 554
555static ssize_t regulator_suspend_mem_state_show(struct device *dev,
556 struct device_attribute *attr, char *buf)
557{
a5766f11 558 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 559
4fca9545
DB		 560 return regulator_print_state(buf,
561 rdev->constraints->state_mem.enabled);
414c70cb 562}
7ad68e2f
DB		 563static DEVICE_ATTR(suspend_mem_state, 0444,
564 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 565
566static ssize_t regulator_suspend_disk_state_show(struct device *dev,
567 struct device_attribute *attr, char *buf)
568{
a5766f11 569 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 570
4fca9545
DB		 571 return regulator_print_state(buf,
572 rdev->constraints->state_disk.enabled);
414c70cb 573}
7ad68e2f
DB		 574static DEVICE_ATTR(suspend_disk_state, 0444,
575 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 576
577static ssize_t regulator_suspend_standby_state_show(struct device *dev,
578 struct device_attribute *attr, char *buf)
579{
a5766f11 580 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 581
4fca9545
DB		 582 return regulator_print_state(buf,
583 rdev->constraints->state_standby.enabled);
414c70cb 584}
7ad68e2f
DB		 585static DEVICE_ATTR(suspend_standby_state, 0444,
586 regulator_suspend_standby_state_show, NULL);
587
bc558a60 588
7ad68e2f
DB		 589/*
590 * These are the only attributes are present for all regulators.
591 * Other attributes are a function of regulator functionality.
592 */
414c70cb 593static struct device_attribute regulator_dev_attrs[] = {
bc558a60 594 __ATTR(name, 0444, regulator_name_show, NULL),
414c70cb
LG		 595 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
596 __ATTR(type, 0444, regulator_type_show, NULL),
414c70cb
LG		 597 __ATTR_NULL,
598};
599
600static void regulator_dev_release(struct device *dev)
601{
a5766f11 602 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 603 kfree(rdev);
604}
605
606static struct class regulator_class = {
607 .name = "regulator",
608 .dev_release = regulator_dev_release,
609 .dev_attrs = regulator_dev_attrs,
610};
611
612/* Calculate the new optimum regulator operating mode based on the new total
613 * consumer load. All locks held by caller */
614static void drms_uA_update(struct regulator_dev *rdev)
615{
616 struct regulator *sibling;
617 int current_uA = 0, output_uV, input_uV, err;
618 unsigned int mode;
619
620 err = regulator_check_drms(rdev);
621 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
476c2d83
MB		 622 (!rdev->desc->ops->get_voltage &&
623 !rdev->desc->ops->get_voltage_sel) ||
624 !rdev->desc->ops->set_mode)
036de8ef 625 return;
414c70cb
LG		 626
627 /* get output voltage */
1bf5a1f8 628 output_uV = _regulator_get_voltage(rdev);
414c70cb
LG		 629 if (output_uV <= 0)
630 return;
631
632 /* get input voltage */
1bf5a1f8
MB		 633 input_uV = 0;
634 if (rdev->supply)
3f24f5ad 635 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 636 if (input_uV <= 0)
414c70cb
LG		 637 input_uV = rdev->constraints->input_uV;
638 if (input_uV <= 0)
639 return;
640
641 /* calc total requested load */
642 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 643 current_uA += sibling->uA_load;
414c70cb
LG		 644
645 /* now get the optimum mode for our new total regulator load */
646 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
647 output_uV, current_uA);
648
649 /* check the new mode is allowed */
2c608234 650 err = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 651 if (err == 0)
652 rdev->desc->ops->set_mode(rdev, mode);
653}
654
655static int suspend_set_state(struct regulator_dev *rdev,
656 struct regulator_state *rstate)
657{
658 int ret = 0;
638f85c5
MB		 659
660 /* If we have no suspend mode configration don't set anything;
8ac0e95d
AL		 661 * only warn if the driver implements set_suspend_voltage or
662 * set_suspend_mode callback.
638f85c5
MB		 663 */
664 if (!rstate->enabled && !rstate->disabled) {
8ac0e95d
AL		 665 if (rdev->desc->ops->set_suspend_voltage ||
666 rdev->desc->ops->set_suspend_mode)
5da84fd9 667 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 668 return 0;
669 }
670
671 if (rstate->enabled && rstate->disabled) {
5da84fd9 672 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 673 return -EINVAL;
674 }
414c70cb 675
8ac0e95d 676 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
414c70cb 677 ret = rdev->desc->ops->set_suspend_enable(rdev);
8ac0e95d 678 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
414c70cb 679 ret = rdev->desc->ops->set_suspend_disable(rdev);
8ac0e95d
AL		 680 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
681 ret = 0;
682
414c70cb 683 if (ret < 0) {
5da84fd9 684 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 685 return ret;
686 }
687
688 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
689 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
690 if (ret < 0) {
5da84fd9 691 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 692 return ret;
693 }
694 }
695
696 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
697 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
698 if (ret < 0) {
5da84fd9 699 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 700 return ret;
701 }
702 }
703 return ret;
704}
705
706/* locks held by caller */
707static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
708{
709 if (!rdev->constraints)
710 return -EINVAL;
711
712 switch (state) {
713 case PM_SUSPEND_STANDBY:
714 return suspend_set_state(rdev,
715 &rdev->constraints->state_standby);
716 case PM_SUSPEND_MEM:
717 return suspend_set_state(rdev,
718 &rdev->constraints->state_mem);
719 case PM_SUSPEND_MAX:
720 return suspend_set_state(rdev,
721 &rdev->constraints->state_disk);
722 default:
723 return -EINVAL;
724 }
725}
726
727static void print_constraints(struct regulator_dev *rdev)
728{
729 struct regulation_constraints *constraints = rdev->constraints;
973e9a27 730 char buf[80] = "";
8f031b48
MB		 731 int count = 0;
732 int ret;
414c70cb 733
8f031b48 734 if (constraints->min_uV && constraints->max_uV) {
414c70cb 735 if (constraints->min_uV == constraints->max_uV)
8f031b48
MB		 736 count += sprintf(buf + count, "%d mV ",
737 constraints->min_uV / 1000);
414c70cb 738 else
8f031b48
MB		 739 count += sprintf(buf + count, "%d <--> %d mV ",
740 constraints->min_uV / 1000,
741 constraints->max_uV / 1000);
742 }
743
744 if (!constraints->min_uV ||
745 constraints->min_uV != constraints->max_uV) {
746 ret = _regulator_get_voltage(rdev);
747 if (ret > 0)
748 count += sprintf(buf + count, "at %d mV ", ret / 1000);
749 }
750
bf5892a8
MB		 751 if (constraints->uV_offset)
752 count += sprintf(buf, "%dmV offset ",
753 constraints->uV_offset / 1000);
754
8f031b48 755 if (constraints->min_uA && constraints->max_uA) {
414c70cb 756 if (constraints->min_uA == constraints->max_uA)
8f031b48
MB		 757 count += sprintf(buf + count, "%d mA ",
758 constraints->min_uA / 1000);
414c70cb 759 else
8f031b48
MB		 760 count += sprintf(buf + count, "%d <--> %d mA ",
761 constraints->min_uA / 1000,
762 constraints->max_uA / 1000);
763 }
764
765 if (!constraints->min_uA ||
766 constraints->min_uA != constraints->max_uA) {
767 ret = _regulator_get_current_limit(rdev);
768 if (ret > 0)
e4a6376b 769 count += sprintf(buf + count, "at %d mA ", ret / 1000);
414c70cb 770 }
8f031b48 771
414c70cb
LG		 772 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
773 count += sprintf(buf + count, "fast ");
774 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
775 count += sprintf(buf + count, "normal ");
776 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
777 count += sprintf(buf + count, "idle ");
778 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
779 count += sprintf(buf + count, "standby");
780
215b8b05
UKK		 781 if (!count)
782 sprintf(buf, "no parameters");
783
13ce29f8 784 rdev_info(rdev, "%s\n", buf);
4a682922
MB		 785
786 if ((constraints->min_uV != constraints->max_uV) &&
787 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
788 rdev_warn(rdev,
789 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 790}
791
e79055d6 792static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 793 struct regulation_constraints *constraints)
a5766f11 794{
e5fda26c 795 struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 796 int ret;
797
798 /* do we need to apply the constraint voltage */
799 if (rdev->constraints->apply_uV &&
75790251
MB		 800 rdev->constraints->min_uV == rdev->constraints->max_uV) {
801 ret = _regulator_do_set_voltage(rdev,
802 rdev->constraints->min_uV,
803 rdev->constraints->max_uV);
804 if (ret < 0) {
805 rdev_err(rdev, "failed to apply %duV constraint\n",
806 rdev->constraints->min_uV);
75790251
MB		 807 return ret;
808 }
af5866c9 809 }
e06f5b4f 810
4367cfdc
DB		 811 /* constrain machine-level voltage specs to fit
812 * the actual range supported by this regulator.
813 */
814 if (ops->list_voltage && rdev->desc->n_voltages) {
815 int count = rdev->desc->n_voltages;
816 int i;
817 int min_uV = INT_MAX;
818 int max_uV = INT_MIN;
819 int cmin = constraints->min_uV;
820 int cmax = constraints->max_uV;
821
3e590918
MB		 822 /* it's safe to autoconfigure fixed-voltage supplies
823 and the constraints are used by list_voltage. */
4367cfdc 824 if (count == 1 && !cmin) {
3e590918 825 cmin = 1;
4367cfdc 826 cmax = INT_MAX;
3e590918
MB		 827 constraints->min_uV = cmin;
828 constraints->max_uV = cmax;
4367cfdc
DB		 829 }
830
3e2b9abd
MB		 831 /* voltage constraints are optional */
832 if ((cmin == 0) && (cmax == 0))
e79055d6 833 return 0;
3e2b9abd 834
4367cfdc 835 /* else require explicit machine-level constraints */
3e2b9abd 836 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 837 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 838 return -EINVAL;
4367cfdc
DB		 839 }
840
841 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
842 for (i = 0; i < count; i++) {
843 int value;
844
845 value = ops->list_voltage(rdev, i);
846 if (value <= 0)
847 continue;
848
849 /* maybe adjust [min_uV..max_uV] */
850 if (value >= cmin && value < min_uV)
851 min_uV = value;
852 if (value <= cmax && value > max_uV)
853 max_uV = value;
854 }
855
856 /* final: [min_uV..max_uV] valid iff constraints valid */
857 if (max_uV < min_uV) {
5da84fd9 858 rdev_err(rdev, "unsupportable voltage constraints\n");
e79055d6 859 return -EINVAL;
4367cfdc
DB		 860 }
861
862 /* use regulator's subset of machine constraints */
863 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 864 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
865 constraints->min_uV, min_uV);
4367cfdc
DB		 866 constraints->min_uV = min_uV;
867 }
868 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 869 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
870 constraints->max_uV, max_uV);
4367cfdc
DB		 871 constraints->max_uV = max_uV;
872 }
873 }
874
e79055d6
MB		 875 return 0;
876}
877
878/**
879 * set_machine_constraints - sets regulator constraints
880 * @rdev: regulator source
881 * @constraints: constraints to apply
882 *
883 * Allows platform initialisation code to define and constrain
884 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
885 * Constraints *must* be set by platform code in order for some
886 * regulator operations to proceed i.e. set_voltage, set_current_limit,
887 * set_mode.
888 */
889static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 890 const struct regulation_constraints *constraints)
e79055d6
MB		 891{
892 int ret = 0;
e79055d6
MB		 893 struct regulator_ops *ops = rdev->desc->ops;
894
9a8f5e07
MB		 895 if (constraints)
896 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
897 GFP_KERNEL);
898 else
899 rdev->constraints = kzalloc(sizeof(*constraints),
900 GFP_KERNEL);
f8c12fe3
MB		 901 if (!rdev->constraints)
902 return -ENOMEM;
af5866c9 903
f8c12fe3 904 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6
MB		 905 if (ret != 0)
906 goto out;
907
a5766f11 908 /* do we need to setup our suspend state */
9a8f5e07 909 if (rdev->constraints->initial_state) {
f8c12fe3 910 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 911 if (ret < 0) {
5da84fd9 912 rdev_err(rdev, "failed to set suspend state\n");
e06f5b4f
MB		 913 goto out;
914 }
915 }
a5766f11 916
9a8f5e07 917 if (rdev->constraints->initial_mode) {
a308466c 918 if (!ops->set_mode) {
5da84fd9 919 rdev_err(rdev, "no set_mode operation\n");
a308466c
MB		 920 ret = -EINVAL;
921 goto out;
922 }
923
f8c12fe3 924 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 925 if (ret < 0) {
5da84fd9 926 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
a308466c
MB		 927 goto out;
928 }
929 }
930
cacf90f2
MB		 931 /* If the constraints say the regulator should be on at this point
932 * and we have control then make sure it is enabled.
933 */
f8c12fe3
MB		 934 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
935 ops->enable) {
e5fda26c
MB		 936 ret = ops->enable(rdev);
937 if (ret < 0) {
5da84fd9 938 rdev_err(rdev, "failed to enable\n");
e5fda26c
MB		 939 goto out;
940 }
941 }
942
6f0b2c69
YSB		 943 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) {
944 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
945 if (ret < 0) {
946 rdev_err(rdev, "failed to set ramp_delay\n");
947 goto out;
948 }
949 }
950
a5766f11 951 print_constraints(rdev);
1a6958e7 952 return 0;
a5766f11 953out:
1a6958e7
AL		 954 kfree(rdev->constraints);
955 rdev->constraints = NULL;
a5766f11
LG		 956 return ret;
957}
958
959/**
960 * set_supply - set regulator supply regulator
69279fb9
MB		 961 * @rdev: regulator name
962 * @supply_rdev: supply regulator name
a5766f11
LG		 963 *
964 * Called by platform initialisation code to set the supply regulator for this
965 * regulator. This ensures that a regulators supply will also be enabled by the
966 * core if it's child is enabled.
967 */
968static int set_supply(struct regulator_dev *rdev,
3801b86a 969 struct regulator_dev *supply_rdev)
a5766f11
LG		 970{
971 int err;
972
3801b86a
MB		 973 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
974
975 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 976 if (rdev->supply == NULL) {
977 err = -ENOMEM;
3801b86a 978 return err;
a5766f11 979 }
57ad526a 980 supply_rdev->open_count++;
3801b86a
MB		 981
982 return 0;
a5766f11
LG		 983}
984
985/**
06c63f93 986 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 987 * @rdev: regulator source
40f9244f 988 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 989 * @supply: symbolic name for supply
a5766f11
LG		 990 *
991 * Allows platform initialisation code to map physical regulator
992 * sources to symbolic names for supplies for use by devices. Devices
993 * should use these symbolic names to request regulators, avoiding the
994 * need to provide board-specific regulator names as platform data.
995 */
996static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 997 const char *consumer_dev_name,
998 const char *supply)
a5766f11
LG		 999{
1000 struct regulator_map *node;
9ed2099e 1001 int has_dev;
a5766f11
LG		 1002
1003 if (supply == NULL)
1004 return -EINVAL;
1005
9ed2099e
MB		 1006 if (consumer_dev_name != NULL)
1007 has_dev = 1;
1008 else
1009 has_dev = 0;
1010
6001e13c 1011 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1012 if (node->dev_name && consumer_dev_name) {
1013 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1014 continue;
1015 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1016 continue;
23b5cc2a
JN		 1017 }
1018
6001e13c
DB		 1019 if (strcmp(node->supply, supply) != 0)
1020 continue;
1021
737f360d
MB		 1022 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1023 consumer_dev_name,
1024 dev_name(&node->regulator->dev),
1025 node->regulator->desc->name,
1026 supply,
1027 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 1028 return -EBUSY;
1029 }
1030
9ed2099e 1031 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 1032 if (node == NULL)
1033 return -ENOMEM;
1034
1035 node->regulator = rdev;
a5766f11
LG		 1036 node->supply = supply;
1037
9ed2099e
MB		 1038 if (has_dev) {
1039 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1040 if (node->dev_name == NULL) {
1041 kfree(node);
1042 return -ENOMEM;
1043 }
40f9244f
MB		 1044 }
1045
a5766f11
LG		 1046 list_add(&node->list, &regulator_map_list);
1047 return 0;
1048}
1049
0f1d747b
MR		 1050static void unset_regulator_supplies(struct regulator_dev *rdev)
1051{
1052 struct regulator_map *node, *n;
1053
1054 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1055 if (rdev == node->regulator) {
1056 list_del(&node->list);
40f9244f 1057 kfree(node->dev_name);
0f1d747b 1058 kfree(node);
0f1d747b
MR		 1059 }
1060 }
1061}
1062
f5726ae3 1063#define REG_STR_SIZE 64
414c70cb
LG		 1064
1065static struct regulator *create_regulator(struct regulator_dev *rdev,
1066 struct device *dev,
1067 const char *supply_name)
1068{
1069 struct regulator *regulator;
1070 char buf[REG_STR_SIZE];
1071 int err, size;
1072
1073 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1074 if (regulator == NULL)
1075 return NULL;
1076
1077 mutex_lock(&rdev->mutex);
1078 regulator->rdev = rdev;
1079 list_add(&regulator->list, &rdev->consumer_list);
1080
1081 if (dev) {
e2c98eaf
SG		 1082 regulator->dev = dev;
1083
222cc7b1 1084 /* Add a link to the device sysfs entry */
414c70cb
LG		 1085 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1086 dev->kobj.name, supply_name);
1087 if (size >= REG_STR_SIZE)
222cc7b1 1088 goto overflow_err;
414c70cb
LG		 1089
1090 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1091 if (regulator->supply_name == NULL)
222cc7b1 1092 goto overflow_err;
414c70cb
LG		 1093
1094 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1095 buf);
1096 if (err) {
5da84fd9
JP		 1097 rdev_warn(rdev, "could not add device link %s err %d\n",
1098 dev->kobj.name, err);
222cc7b1 1099 /* non-fatal */
414c70cb 1100 }
5de70519
MB		 1101 } else {
1102 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1103 if (regulator->supply_name == NULL)
222cc7b1 1104 goto overflow_err;
5de70519
MB		 1105 }
1106
5de70519
MB		 1107 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1108 rdev->debugfs);
24751434 1109 if (!regulator->debugfs) {
5de70519 1110 rdev_warn(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1111 } else {
1112 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1113 &regulator->uA_load);
1114 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1115 &regulator->min_uV);
1116 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1117 &regulator->max_uV);
414c70cb 1118 }
5de70519 1119
6492bc1b
MB		 1120 /*
1121 * Check now if the regulator is an always on regulator - if
1122 * it is then we don't need to do nearly so much work for
1123 * enable/disable calls.
1124 */
1125 if (!_regulator_can_change_status(rdev) &&
1126 _regulator_is_enabled(rdev))
1127 regulator->always_on = true;
1128
414c70cb
LG		 1129 mutex_unlock(&rdev->mutex);
1130 return regulator;
414c70cb
LG		 1131overflow_err:
1132 list_del(&regulator->list);
1133 kfree(regulator);
1134 mutex_unlock(&rdev->mutex);
1135 return NULL;
1136}
1137
31aae2be
MB		 1138static int _regulator_get_enable_time(struct regulator_dev *rdev)
1139{
1140 if (!rdev->desc->ops->enable_time)
79511ed3 1141 return rdev->desc->enable_time;
31aae2be
MB		 1142 return rdev->desc->ops->enable_time(rdev);
1143}
1144
69511a45 1145static struct regulator_dev *regulator_dev_lookup(struct device *dev,
6d191a5f
MB		 1146 const char *supply,
1147 int *ret)
69511a45
RN		 1148{
1149 struct regulator_dev *r;
1150 struct device_node *node;
576ca436
MB		 1151 struct regulator_map *map;
1152 const char *devname = NULL;
69511a45
RN		 1153
1154 /* first do a dt based lookup */
1155 if (dev && dev->of_node) {
1156 node = of_get_regulator(dev, supply);
6d191a5f 1157 if (node) {
69511a45
RN		 1158 list_for_each_entry(r, &regulator_list, list)
1159 if (r->dev.parent &&
1160 node == r->dev.of_node)
1161 return r;
6d191a5f
MB		 1162 } else {
1163 /*
1164 * If we couldn't even get the node then it's
1165 * not just that the device didn't register
1166 * yet, there's no node and we'll never
1167 * succeed.
1168 */
1169 *ret = -ENODEV;
1170 }
69511a45
RN		 1171 }
1172
1173 /* if not found, try doing it non-dt way */
576ca436
MB		 1174 if (dev)
1175 devname = dev_name(dev);
1176
69511a45
RN		 1177 list_for_each_entry(r, &regulator_list, list)
1178 if (strcmp(rdev_get_name(r), supply) == 0)
1179 return r;
1180
576ca436
MB		 1181 list_for_each_entry(map, &regulator_map_list, list) {
1182 /* If the mapping has a device set up it must match */
1183 if (map->dev_name &&
1184 (!devname || strcmp(map->dev_name, devname)))
1185 continue;
1186
1187 if (strcmp(map->supply, supply) == 0)
1188 return map->regulator;
1189 }
1190
1191
69511a45
RN		 1192 return NULL;
1193}
1194
5ffbd136
MB		 1195/* Internal regulator request function */
1196static struct regulator *_regulator_get(struct device *dev, const char *id,
1197 int exclusive)
414c70cb
LG		 1198{
1199 struct regulator_dev *rdev;
04bf3011 1200 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
40f9244f 1201 const char *devname = NULL;
5ffbd136 1202 int ret;
414c70cb
LG		 1203
1204 if (id == NULL) {
5da84fd9 1205 pr_err("get() with no identifier\n");
414c70cb
LG		 1206 return regulator;
1207 }
1208
40f9244f
MB		 1209 if (dev)
1210 devname = dev_name(dev);
1211
414c70cb
LG		 1212 mutex_lock(&regulator_list_mutex);
1213
6d191a5f 1214 rdev = regulator_dev_lookup(dev, id, &ret);
69511a45
RN		 1215 if (rdev)
1216 goto found;
1217
688fe99a
MB		 1218 if (board_wants_dummy_regulator) {
1219 rdev = dummy_regulator_rdev;
1220 goto found;
1221 }
1222
34abbd68
MB		 1223#ifdef CONFIG_REGULATOR_DUMMY
1224 if (!devname)
1225 devname = "deviceless";
1226
1227 /* If the board didn't flag that it was fully constrained then
1228 * substitute in a dummy regulator so consumers can continue.
1229 */
1230 if (!has_full_constraints) {
5da84fd9
JP		 1231 pr_warn("%s supply %s not found, using dummy regulator\n",
1232 devname, id);
34abbd68
MB		 1233 rdev = dummy_regulator_rdev;
1234 goto found;
1235 }
1236#endif
1237
414c70cb
LG		 1238 mutex_unlock(&regulator_list_mutex);
1239 return regulator;
1240
1241found:
5ffbd136
MB		 1242 if (rdev->exclusive) {
1243 regulator = ERR_PTR(-EPERM);
1244 goto out;
1245 }
1246
1247 if (exclusive && rdev->open_count) {
1248 regulator = ERR_PTR(-EBUSY);
1249 goto out;
1250 }
1251
a5766f11
LG		 1252 if (!try_module_get(rdev->owner))
1253 goto out;
1254
414c70cb
LG		 1255 regulator = create_regulator(rdev, dev, id);
1256 if (regulator == NULL) {
1257 regulator = ERR_PTR(-ENOMEM);
1258 module_put(rdev->owner);
bcda4321 1259 goto out;
414c70cb
LG		 1260 }
1261
5ffbd136
MB		 1262 rdev->open_count++;
1263 if (exclusive) {
1264 rdev->exclusive = 1;
1265
1266 ret = _regulator_is_enabled(rdev);
1267 if (ret > 0)
1268 rdev->use_count = 1;
1269 else
1270 rdev->use_count = 0;
1271 }
1272
a5766f11 1273out:
414c70cb 1274 mutex_unlock(&regulator_list_mutex);
5ffbd136 1275
414c70cb
LG		 1276 return regulator;
1277}
5ffbd136
MB		 1278
1279/**
1280 * regulator_get - lookup and obtain a reference to a regulator.
1281 * @dev: device for regulator "consumer"
1282 * @id: Supply name or regulator ID.
1283 *
1284 * Returns a struct regulator corresponding to the regulator producer,
1285 * or IS_ERR() condition containing errno.
1286 *
1287 * Use of supply names configured via regulator_set_device_supply() is
1288 * strongly encouraged. It is recommended that the supply name used
1289 * should match the name used for the supply and/or the relevant
1290 * device pins in the datasheet.
1291 */
1292struct regulator *regulator_get(struct device *dev, const char *id)
1293{
1294 return _regulator_get(dev, id, 0);
1295}
414c70cb
LG		 1296EXPORT_SYMBOL_GPL(regulator_get);
1297
070b9079
SB		 1298static void devm_regulator_release(struct device *dev, void *res)
1299{
1300 regulator_put(*(struct regulator **)res);
1301}
1302
1303/**
1304 * devm_regulator_get - Resource managed regulator_get()
1305 * @dev: device for regulator "consumer"
1306 * @id: Supply name or regulator ID.
1307 *
1308 * Managed regulator_get(). Regulators returned from this function are
1309 * automatically regulator_put() on driver detach. See regulator_get() for more
1310 * information.
1311 */
1312struct regulator *devm_regulator_get(struct device *dev, const char *id)
1313{
1314 struct regulator **ptr, *regulator;
1315
1316 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1317 if (!ptr)
1318 return ERR_PTR(-ENOMEM);
1319
1320 regulator = regulator_get(dev, id);
1321 if (!IS_ERR(regulator)) {
1322 *ptr = regulator;
1323 devres_add(dev, ptr);
1324 } else {
1325 devres_free(ptr);
1326 }
1327
1328 return regulator;
1329}
1330EXPORT_SYMBOL_GPL(devm_regulator_get);
1331
5ffbd136
MB		 1332/**
1333 * regulator_get_exclusive - obtain exclusive access to a regulator.
1334 * @dev: device for regulator "consumer"
1335 * @id: Supply name or regulator ID.
1336 *
1337 * Returns a struct regulator corresponding to the regulator producer,
1338 * or IS_ERR() condition containing errno. Other consumers will be
1339 * unable to obtain this reference is held and the use count for the
1340 * regulator will be initialised to reflect the current state of the
1341 * regulator.
1342 *
1343 * This is intended for use by consumers which cannot tolerate shared
1344 * use of the regulator such as those which need to force the
1345 * regulator off for correct operation of the hardware they are
1346 * controlling.
1347 *
1348 * Use of supply names configured via regulator_set_device_supply() is
1349 * strongly encouraged. It is recommended that the supply name used
1350 * should match the name used for the supply and/or the relevant
1351 * device pins in the datasheet.
1352 */
1353struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1354{
1355 return _regulator_get(dev, id, 1);
1356}
1357EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1358
414c70cb
LG		 1359/**
1360 * regulator_put - "free" the regulator source
1361 * @regulator: regulator source
1362 *
1363 * Note: drivers must ensure that all regulator_enable calls made on this
1364 * regulator source are balanced by regulator_disable calls prior to calling
1365 * this function.
1366 */
1367void regulator_put(struct regulator *regulator)
1368{
1369 struct regulator_dev *rdev;
1370
1371 if (regulator == NULL || IS_ERR(regulator))
1372 return;
1373
414c70cb
LG		 1374 mutex_lock(&regulator_list_mutex);
1375 rdev = regulator->rdev;
1376
5de70519 1377 debugfs_remove_recursive(regulator->debugfs);
5de70519 1378
414c70cb 1379 /* remove any sysfs entries */
e2c98eaf 1380 if (regulator->dev)
414c70cb 1381 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
5de70519 1382 kfree(regulator->supply_name);
414c70cb
LG		 1383 list_del(&regulator->list);
1384 kfree(regulator);
1385
5ffbd136
MB		 1386 rdev->open_count--;
1387 rdev->exclusive = 0;
1388
414c70cb
LG		 1389 module_put(rdev->owner);
1390 mutex_unlock(&regulator_list_mutex);
1391}
1392EXPORT_SYMBOL_GPL(regulator_put);
1393
d5ad34f7
MB		 1394static int devm_regulator_match(struct device *dev, void *res, void *data)
1395{
1396 struct regulator **r = res;
1397 if (!r || !*r) {
1398 WARN_ON(!r || !*r);
1399 return 0;
1400 }
1401 return *r == data;
1402}
1403
1404/**
1405 * devm_regulator_put - Resource managed regulator_put()
1406 * @regulator: regulator to free
1407 *
1408 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1409 * this function will not need to be called and the resource management
1410 * code will ensure that the resource is freed.
1411 */
1412void devm_regulator_put(struct regulator *regulator)
1413{
1414 int rc;
1415
361ff501 1416 rc = devres_release(regulator->dev, devm_regulator_release,
d5ad34f7 1417 devm_regulator_match, regulator);
230a5a1c 1418 if (rc != 0)
968c2c17 1419 WARN_ON(rc);
d5ad34f7
MB		 1420}
1421EXPORT_SYMBOL_GPL(devm_regulator_put);
1422
5c5659d0
MB		 1423static int _regulator_do_enable(struct regulator_dev *rdev)
1424{
1425 int ret, delay;
1426
1427 /* Query before enabling in case configuration dependent. */
1428 ret = _regulator_get_enable_time(rdev);
1429 if (ret >= 0) {
1430 delay = ret;
1431 } else {
1432 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1433 delay = 0;
1434 }
1435
1436 trace_regulator_enable(rdev_get_name(rdev));
1437
65f73508
MB		 1438 if (rdev->ena_gpio) {
1439 gpio_set_value_cansleep(rdev->ena_gpio,
1440 !rdev->ena_gpio_invert);
1441 rdev->ena_gpio_state = 1;
1442 } else if (rdev->desc->ops->enable) {
5c5659d0
MB		 1443 ret = rdev->desc->ops->enable(rdev);
1444 if (ret < 0)
1445 return ret;
1446 } else {
1447 return -EINVAL;
1448 }
1449
1450 /* Allow the regulator to ramp; it would be useful to extend
1451 * this for bulk operations so that the regulators can ramp
1452 * together. */
1453 trace_regulator_enable_delay(rdev_get_name(rdev));
1454
1455 if (delay >= 1000) {
1456 mdelay(delay / 1000);
1457 udelay(delay % 1000);
1458 } else if (delay) {
1459 udelay(delay);
1460 }
1461
1462 trace_regulator_enable_complete(rdev_get_name(rdev));
1463
1464 return 0;
1465}
1466
414c70cb
LG		 1467/* locks held by regulator_enable() */
1468static int _regulator_enable(struct regulator_dev *rdev)
1469{
5c5659d0 1470 int ret;
414c70cb 1471
414c70cb 1472 /* check voltage and requested load before enabling */
9a2372fa
MB		 1473 if (rdev->constraints &&
1474 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1475 drms_uA_update(rdev);
414c70cb 1476
9a2372fa
MB		 1477 if (rdev->use_count == 0) {
1478 /* The regulator may on if it's not switchable or left on */
1479 ret = _regulator_is_enabled(rdev);
1480 if (ret == -EINVAL || ret == 0) {
1481 if (!_regulator_can_change_status(rdev))
1482 return -EPERM;
1483
5c5659d0 1484 ret = _regulator_do_enable(rdev);
31aae2be
MB		 1485 if (ret < 0)
1486 return ret;
1487
a7433cff 1488 } else if (ret < 0) {
5da84fd9 1489 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 1490 return ret;
1491 }
a7433cff 1492 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 1493 }
1494
9a2372fa
MB		 1495 rdev->use_count++;
1496
1497 return 0;
414c70cb
LG		 1498}
1499
1500/**
1501 * regulator_enable - enable regulator output
1502 * @regulator: regulator source
1503 *
cf7bbcdf
MB		 1504 * Request that the regulator be enabled with the regulator output at
1505 * the predefined voltage or current value. Calls to regulator_enable()
1506 * must be balanced with calls to regulator_disable().
1507 *
414c70cb 1508 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 1509 * hardwired in the regulator.
414c70cb
LG		 1510 */
1511int regulator_enable(struct regulator *regulator)
1512{
412aec61
DB		 1513 struct regulator_dev *rdev = regulator->rdev;
1514 int ret = 0;
414c70cb 1515
6492bc1b
MB		 1516 if (regulator->always_on)
1517 return 0;
1518
3801b86a
MB		 1519 if (rdev->supply) {
1520 ret = regulator_enable(rdev->supply);
1521 if (ret != 0)
1522 return ret;
1523 }
1524
412aec61 1525 mutex_lock(&rdev->mutex);
cd94b505 1526 ret = _regulator_enable(rdev);
412aec61 1527 mutex_unlock(&rdev->mutex);
3801b86a 1528
d1685e4e 1529 if (ret != 0 && rdev->supply)
3801b86a
MB		 1530 regulator_disable(rdev->supply);
1531
414c70cb
LG		 1532 return ret;
1533}
1534EXPORT_SYMBOL_GPL(regulator_enable);
1535
5c5659d0
MB		 1536static int _regulator_do_disable(struct regulator_dev *rdev)
1537{
1538 int ret;
1539
1540 trace_regulator_disable(rdev_get_name(rdev));
1541
1542 if (rdev->ena_gpio) {
1543 gpio_set_value_cansleep(rdev->ena_gpio,
1544 rdev->ena_gpio_invert);
1545 rdev->ena_gpio_state = 0;
1546
1547 } else if (rdev->desc->ops->disable) {
1548 ret = rdev->desc->ops->disable(rdev);
1549 if (ret != 0)
1550 return ret;
1551 }
1552
1553 trace_regulator_disable_complete(rdev_get_name(rdev));
1554
1555 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1556 NULL);
1557 return 0;
1558}
1559
414c70cb 1560/* locks held by regulator_disable() */
3801b86a 1561static int _regulator_disable(struct regulator_dev *rdev)
414c70cb
LG		 1562{
1563 int ret = 0;
1564
cd94b505 1565 if (WARN(rdev->use_count <= 0,
43e7ee33 1566 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 1567 return -EIO;
1568
414c70cb 1569 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 1570 if (rdev->use_count == 1 &&
1571 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 1572
1573 /* we are last user */
5c5659d0
MB		 1574 if (_regulator_can_change_status(rdev)) {
1575 ret = _regulator_do_disable(rdev);
414c70cb 1576 if (ret < 0) {
5da84fd9 1577 rdev_err(rdev, "failed to disable\n");
414c70cb
LG		 1578 return ret;
1579 }
1580 }
1581
414c70cb
LG		 1582 rdev->use_count = 0;
1583 } else if (rdev->use_count > 1) {
1584
1585 if (rdev->constraints &&
1586 (rdev->constraints->valid_ops_mask &
1587 REGULATOR_CHANGE_DRMS))
1588 drms_uA_update(rdev);
1589
1590 rdev->use_count--;
1591 }
3801b86a 1592
414c70cb
LG		 1593 return ret;
1594}
1595
1596/**
1597 * regulator_disable - disable regulator output
1598 * @regulator: regulator source
1599 *
cf7bbcdf
MB		 1600 * Disable the regulator output voltage or current. Calls to
1601 * regulator_enable() must be balanced with calls to
1602 * regulator_disable().
69279fb9 1603 *
414c70cb 1604 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 1605 * devices have it enabled, the regulator device supports disabling and
1606 * machine constraints permit this operation.
414c70cb
LG		 1607 */
1608int regulator_disable(struct regulator *regulator)
1609{
412aec61
DB		 1610 struct regulator_dev *rdev = regulator->rdev;
1611 int ret = 0;
414c70cb 1612
6492bc1b
MB		 1613 if (regulator->always_on)
1614 return 0;
1615
412aec61 1616 mutex_lock(&rdev->mutex);
3801b86a 1617 ret = _regulator_disable(rdev);
412aec61 1618 mutex_unlock(&rdev->mutex);
8cbf811d 1619
3801b86a
MB		 1620 if (ret == 0 && rdev->supply)
1621 regulator_disable(rdev->supply);
8cbf811d 1622
414c70cb
LG		 1623 return ret;
1624}
1625EXPORT_SYMBOL_GPL(regulator_disable);
1626
1627/* locks held by regulator_force_disable() */
3801b86a 1628static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 1629{
1630 int ret = 0;
1631
1632 /* force disable */
1633 if (rdev->desc->ops->disable) {
1634 /* ah well, who wants to live forever... */
1635 ret = rdev->desc->ops->disable(rdev);
1636 if (ret < 0) {
5da84fd9 1637 rdev_err(rdev, "failed to force disable\n");
414c70cb
LG		 1638 return ret;
1639 }
1640 /* notify other consumers that power has been forced off */
84b68263
MB		 1641 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1642 REGULATOR_EVENT_DISABLE, NULL);
414c70cb
LG		 1643 }
1644
414c70cb
LG		 1645 return ret;
1646}
1647
1648/**
1649 * regulator_force_disable - force disable regulator output
1650 * @regulator: regulator source
1651 *
1652 * Forcibly disable the regulator output voltage or current.
1653 * NOTE: this *will* disable the regulator output even if other consumer
1654 * devices have it enabled. This should be used for situations when device
1655 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1656 */
1657int regulator_force_disable(struct regulator *regulator)
1658{
82d15839 1659 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 1660 int ret;
1661
82d15839 1662 mutex_lock(&rdev->mutex);
414c70cb 1663 regulator->uA_load = 0;
3801b86a 1664 ret = _regulator_force_disable(regulator->rdev);
82d15839 1665 mutex_unlock(&rdev->mutex);
8cbf811d 1666
3801b86a
MB		 1667 if (rdev->supply)
1668 while (rdev->open_count--)
1669 regulator_disable(rdev->supply);
8cbf811d 1670
414c70cb
LG		 1671 return ret;
1672}
1673EXPORT_SYMBOL_GPL(regulator_force_disable);
1674
da07ecd9
MB		 1675static void regulator_disable_work(struct work_struct *work)
1676{
1677 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1678 disable_work.work);
1679 int count, i, ret;
1680
1681 mutex_lock(&rdev->mutex);
1682
1683 BUG_ON(!rdev->deferred_disables);
1684
1685 count = rdev->deferred_disables;
1686 rdev->deferred_disables = 0;
1687
1688 for (i = 0; i < count; i++) {
1689 ret = _regulator_disable(rdev);
1690 if (ret != 0)
1691 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1692 }
1693
1694 mutex_unlock(&rdev->mutex);
1695
1696 if (rdev->supply) {
1697 for (i = 0; i < count; i++) {
1698 ret = regulator_disable(rdev->supply);
1699 if (ret != 0) {
1700 rdev_err(rdev,
1701 "Supply disable failed: %d\n", ret);
1702 }
1703 }
1704 }
1705}
1706
1707/**
1708 * regulator_disable_deferred - disable regulator output with delay
1709 * @regulator: regulator source
1710 * @ms: miliseconds until the regulator is disabled
1711 *
1712 * Execute regulator_disable() on the regulator after a delay. This
1713 * is intended for use with devices that require some time to quiesce.
1714 *
1715 * NOTE: this will only disable the regulator output if no other consumer
1716 * devices have it enabled, the regulator device supports disabling and
1717 * machine constraints permit this operation.
1718 */
1719int regulator_disable_deferred(struct regulator *regulator, int ms)
1720{
1721 struct regulator_dev *rdev = regulator->rdev;
aa59802d 1722 int ret;
da07ecd9 1723
6492bc1b
MB		 1724 if (regulator->always_on)
1725 return 0;
1726
2b5a24a0
MB		 1727 if (!ms)
1728 return regulator_disable(regulator);
1729
da07ecd9
MB		 1730 mutex_lock(&rdev->mutex);
1731 rdev->deferred_disables++;
1732 mutex_unlock(&rdev->mutex);
1733
aa59802d
MB		 1734 ret = schedule_delayed_work(&rdev->disable_work,
1735 msecs_to_jiffies(ms));
1736 if (ret < 0)
1737 return ret;
1738 else
1739 return 0;
da07ecd9
MB		 1740}
1741EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1742
cd6dffb4
MB		 1743/**
1744 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1745 *
1746 * @rdev: regulator to operate on
1747 *
1748 * Regulators that use regmap for their register I/O can set the
1749 * enable_reg and enable_mask fields in their descriptor and then use
1750 * this as their is_enabled operation, saving some code.
1751 */
1752int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1753{
1754 unsigned int val;
1755 int ret;
1756
1757 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1758 if (ret != 0)
1759 return ret;
1760
1761 return (val & rdev->desc->enable_mask) != 0;
1762}
1763EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1764
1765/**
1766 * regulator_enable_regmap - standard enable() for regmap users
1767 *
1768 * @rdev: regulator to operate on
1769 *
1770 * Regulators that use regmap for their register I/O can set the
1771 * enable_reg and enable_mask fields in their descriptor and then use
1772 * this as their enable() operation, saving some code.
1773 */
1774int regulator_enable_regmap(struct regulator_dev *rdev)
1775{
1776 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1777 rdev->desc->enable_mask,
1778 rdev->desc->enable_mask);
1779}
1780EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1781
1782/**
1783 * regulator_disable_regmap - standard disable() for regmap users
1784 *
1785 * @rdev: regulator to operate on
1786 *
1787 * Regulators that use regmap for their register I/O can set the
1788 * enable_reg and enable_mask fields in their descriptor and then use
1789 * this as their disable() operation, saving some code.
1790 */
1791int regulator_disable_regmap(struct regulator_dev *rdev)
1792{
1793 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1794 rdev->desc->enable_mask, 0);
1795}
1796EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1797
414c70cb
LG		 1798static int _regulator_is_enabled(struct regulator_dev *rdev)
1799{
65f73508
MB		 1800 /* A GPIO control always takes precedence */
1801 if (rdev->ena_gpio)
1802 return rdev->ena_gpio_state;
1803
9a7f6a4c 1804 /* If we don't know then assume that the regulator is always on */
9332546f 1805 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 1806 return 1;
414c70cb 1807
9332546f 1808 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 1809}
1810
1811/**
1812 * regulator_is_enabled - is the regulator output enabled
1813 * @regulator: regulator source
1814 *
412aec61
DB		 1815 * Returns positive if the regulator driver backing the source/client
1816 * has requested that the device be enabled, zero if it hasn't, else a
1817 * negative errno code.
1818 *
1819 * Note that the device backing this regulator handle can have multiple
1820 * users, so it might be enabled even if regulator_enable() was never
1821 * called for this particular source.
414c70cb
LG		 1822 */
1823int regulator_is_enabled(struct regulator *regulator)
1824{
9332546f
MB		 1825 int ret;
1826
6492bc1b
MB		 1827 if (regulator->always_on)
1828 return 1;
1829
9332546f
MB		 1830 mutex_lock(&regulator->rdev->mutex);
1831 ret = _regulator_is_enabled(regulator->rdev);
1832 mutex_unlock(&regulator->rdev->mutex);
1833
1834 return ret;
414c70cb
LG		 1835}
1836EXPORT_SYMBOL_GPL(regulator_is_enabled);
1837
4367cfdc
DB		 1838/**
1839 * regulator_count_voltages - count regulator_list_voltage() selectors
1840 * @regulator: regulator source
1841 *
1842 * Returns number of selectors, or negative errno. Selectors are
1843 * numbered starting at zero, and typically correspond to bitfields
1844 * in hardware registers.
1845 */
1846int regulator_count_voltages(struct regulator *regulator)
1847{
1848 struct regulator_dev *rdev = regulator->rdev;
1849
1850 return rdev->desc->n_voltages ? : -EINVAL;
1851}
1852EXPORT_SYMBOL_GPL(regulator_count_voltages);
1853
bca7bbff
MB		 1854/**
1855 * regulator_list_voltage_linear - List voltages with simple calculation
1856 *
1857 * @rdev: Regulator device
1858 * @selector: Selector to convert into a voltage
1859 *
1860 * Regulators with a simple linear mapping between voltages and
1861 * selectors can set min_uV and uV_step in the regulator descriptor
1862 * and then use this function as their list_voltage() operation,
1863 */
1864int regulator_list_voltage_linear(struct regulator_dev *rdev,
1865 unsigned int selector)
1866{
1867 if (selector >= rdev->desc->n_voltages)
1868 return -EINVAL;
1869
1870 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
1871}
1872EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
1873
cffc9592
AL		 1874/**
1875 * regulator_list_voltage_table - List voltages with table based mapping
1876 *
1877 * @rdev: Regulator device
1878 * @selector: Selector to convert into a voltage
1879 *
1880 * Regulators with table based mapping between voltages and
1881 * selectors can set volt_table in the regulator descriptor
1882 * and then use this function as their list_voltage() operation.
1883 */
1884int regulator_list_voltage_table(struct regulator_dev *rdev,
1885 unsigned int selector)
1886{
1887 if (!rdev->desc->volt_table) {
1888 BUG_ON(!rdev->desc->volt_table);
1889 return -EINVAL;
1890 }
1891
1892 if (selector >= rdev->desc->n_voltages)
1893 return -EINVAL;
1894
1895 return rdev->desc->volt_table[selector];
1896}
1897EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
1898
4367cfdc
DB		 1899/**
1900 * regulator_list_voltage - enumerate supported voltages
1901 * @regulator: regulator source
1902 * @selector: identify voltage to list
1903 * Context: can sleep
1904 *
1905 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 1906 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 1907 * negative errno.
1908 */
1909int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1910{
1911 struct regulator_dev *rdev = regulator->rdev;
1912 struct regulator_ops *ops = rdev->desc->ops;
1913 int ret;
1914
1915 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1916 return -EINVAL;
1917
1918 mutex_lock(&rdev->mutex);
1919 ret = ops->list_voltage(rdev, selector);
1920 mutex_unlock(&rdev->mutex);
1921
1922 if (ret > 0) {
1923 if (ret < rdev->constraints->min_uV)
1924 ret = 0;
1925 else if (ret > rdev->constraints->max_uV)
1926 ret = 0;
1927 }
1928
1929 return ret;
1930}
1931EXPORT_SYMBOL_GPL(regulator_list_voltage);
1932
a7a1ad90
MB		 1933/**
1934 * regulator_is_supported_voltage - check if a voltage range can be supported
1935 *
1936 * @regulator: Regulator to check.
1937 * @min_uV: Minimum required voltage in uV.
1938 * @max_uV: Maximum required voltage in uV.
1939 *
1940 * Returns a boolean or a negative error code.
1941 */
1942int regulator_is_supported_voltage(struct regulator *regulator,
1943 int min_uV, int max_uV)
1944{
c5f3939b 1945 struct regulator_dev *rdev = regulator->rdev;
a7a1ad90
MB		 1946 int i, voltages, ret;
1947
c5f3939b
MB		 1948 /* If we can't change voltage check the current voltage */
1949 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
1950 ret = regulator_get_voltage(regulator);
1951 if (ret >= 0)
1952 return (min_uV >= ret && ret <= max_uV);
1953 else
1954 return ret;
1955 }
1956
a7a1ad90
MB		 1957 ret = regulator_count_voltages(regulator);
1958 if (ret < 0)
1959 return ret;
1960 voltages = ret;
1961
1962 for (i = 0; i < voltages; i++) {
1963 ret = regulator_list_voltage(regulator, i);
1964
1965 if (ret >= min_uV && ret <= max_uV)
1966 return 1;
1967 }
1968
1969 return 0;
1970}
a398eaa2 1971EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 1972
4ab5b3d9
MB		 1973/**
1974 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
1975 *
1976 * @rdev: regulator to operate on
1977 *
1978 * Regulators that use regmap for their register I/O can set the
1979 * vsel_reg and vsel_mask fields in their descriptor and then use this
1980 * as their get_voltage_vsel operation, saving some code.
1981 */
1982int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
1983{
1984 unsigned int val;
1985 int ret;
1986
1987 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
1988 if (ret != 0)
1989 return ret;
1990
1991 val &= rdev->desc->vsel_mask;
1992 val >>= ffs(rdev->desc->vsel_mask) - 1;
1993
1994 return val;
1995}
1996EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
1997
1998/**
1999 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2000 *
2001 * @rdev: regulator to operate on
2002 * @sel: Selector to set
2003 *
2004 * Regulators that use regmap for their register I/O can set the
2005 * vsel_reg and vsel_mask fields in their descriptor and then use this
2006 * as their set_voltage_vsel operation, saving some code.
2007 */
2008int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
2009{
2010 sel <<= ffs(rdev->desc->vsel_mask) - 1;
2011
2012 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
2013 rdev->desc->vsel_mask, sel);
2014}
2015EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
2016
e843fc46
MB		 2017/**
2018 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2019 *
2020 * @rdev: Regulator to operate on
2021 * @min_uV: Lower bound for voltage
2022 * @max_uV: Upper bound for voltage
2023 *
2024 * Drivers implementing set_voltage_sel() and list_voltage() can use
2025 * this as their map_voltage() operation. It will find a suitable
2026 * voltage by calling list_voltage() until it gets something in bounds
2027 * for the requested voltages.
2028 */
2029int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2030 int min_uV, int max_uV)
2031{
2032 int best_val = INT_MAX;
2033 int selector = 0;
2034 int i, ret;
2035
2036 /* Find the smallest voltage that falls within the specified
2037 * range.
2038 */
2039 for (i = 0; i < rdev->desc->n_voltages; i++) {
2040 ret = rdev->desc->ops->list_voltage(rdev, i);
2041 if (ret < 0)
2042 continue;
2043
2044 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2045 best_val = ret;
2046 selector = i;
2047 }
2048 }
2049
2050 if (best_val != INT_MAX)
2051 return selector;
2052 else
2053 return -EINVAL;
2054}
2055EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2056
bca7bbff
MB		 2057/**
2058 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2059 *
2060 * @rdev: Regulator to operate on
2061 * @min_uV: Lower bound for voltage
2062 * @max_uV: Upper bound for voltage
2063 *
2064 * Drivers providing min_uV and uV_step in their regulator_desc can
2065 * use this as their map_voltage() operation.
2066 */
2067int regulator_map_voltage_linear(struct regulator_dev *rdev,
2068 int min_uV, int max_uV)
2069{
2070 int ret, voltage;
2071
5a6881e8
AL		 2072 /* Allow uV_step to be 0 for fixed voltage */
2073 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
2074 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
2075 return 0;
2076 else
2077 return -EINVAL;
2078 }
2079
bca7bbff
MB		 2080 if (!rdev->desc->uV_step) {
2081 BUG_ON(!rdev->desc->uV_step);
2082 return -EINVAL;
2083 }
2084
0bdc81e4
AL		 2085 if (min_uV < rdev->desc->min_uV)
2086 min_uV = rdev->desc->min_uV;
2087
ccfcb1c3 2088 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
bca7bbff
MB		 2089 if (ret < 0)
2090 return ret;
2091
2092 /* Map back into a voltage to verify we're still in bounds */
2093 voltage = rdev->desc->ops->list_voltage(rdev, ret);
2094 if (voltage < min_uV || voltage > max_uV)
2095 return -EINVAL;
2096
2097 return ret;
2098}
2099EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2100
75790251
MB		 2101static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2102 int min_uV, int max_uV)
2103{
2104 int ret;
77af1b26 2105 int delay = 0;
e113d792 2106 int best_val = 0;
75790251 2107 unsigned int selector;
eba41a5e 2108 int old_selector = -1;
75790251
MB		 2109
2110 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2111
bf5892a8
MB		 2112 min_uV += rdev->constraints->uV_offset;
2113 max_uV += rdev->constraints->uV_offset;
2114
eba41a5e
AL		 2115 /*
2116 * If we can't obtain the old selector there is not enough
2117 * info to call set_voltage_time_sel().
2118 */
8b7485ef
AL		 2119 if (_regulator_is_enabled(rdev) &&
2120 rdev->desc->ops->set_voltage_time_sel &&
eba41a5e
AL		 2121 rdev->desc->ops->get_voltage_sel) {
2122 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2123 if (old_selector < 0)
2124 return old_selector;
2125 }
2126
75790251
MB		 2127 if (rdev->desc->ops->set_voltage) {
2128 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2129 &selector);
e113d792
MB		 2130
2131 if (ret >= 0) {
2132 if (rdev->desc->ops->list_voltage)
2133 best_val = rdev->desc->ops->list_voltage(rdev,
2134 selector);
2135 else
2136 best_val = _regulator_get_voltage(rdev);
2137 }
2138
e8eef82b 2139 } else if (rdev->desc->ops->set_voltage_sel) {
9152c36a 2140 if (rdev->desc->ops->map_voltage) {
e843fc46
MB		 2141 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2142 max_uV);
9152c36a
AL		 2143 } else {
2144 if (rdev->desc->ops->list_voltage ==
2145 regulator_list_voltage_linear)
2146 ret = regulator_map_voltage_linear(rdev,
2147 min_uV, max_uV);
2148 else
2149 ret = regulator_map_voltage_iterate(rdev,
2150 min_uV, max_uV);
2151 }
e8eef82b 2152
e843fc46 2153 if (ret >= 0) {
e113d792
MB		 2154 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2155 if (min_uV <= best_val && max_uV >= best_val) {
2156 selector = ret;
2157 ret = rdev->desc->ops->set_voltage_sel(rdev,
2158 ret);
2159 } else {
2160 ret = -EINVAL;
2161 }
e8eef82b 2162 }
75790251
MB		 2163 } else {
2164 ret = -EINVAL;
2165 }
e8eef82b 2166
eba41a5e 2167 /* Call set_voltage_time_sel if successfully obtained old_selector */
5aff3a8b 2168 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
eba41a5e 2169 rdev->desc->ops->set_voltage_time_sel) {
77af1b26 2170
eba41a5e
AL		 2171 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2172 old_selector, selector);
2173 if (delay < 0) {
2174 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2175 delay);
2176 delay = 0;
e8eef82b 2177 }
75790251 2178
8b96de31
PR		 2179 /* Insert any necessary delays */
2180 if (delay >= 1000) {
2181 mdelay(delay / 1000);
2182 udelay(delay % 1000);
2183 } else if (delay) {
2184 udelay(delay);
2185 }
77af1b26
LW		 2186 }
2187
2f6c797f
AL		 2188 if (ret == 0 && best_val >= 0) {
2189 unsigned long data = best_val;
2190
ded06a52 2191 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2f6c797f
AL		 2192 (void *)data);
2193 }
ded06a52 2194
eba41a5e 2195 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
75790251
MB		 2196
2197 return ret;
2198}
2199
414c70cb
LG		 2200/**
2201 * regulator_set_voltage - set regulator output voltage
2202 * @regulator: regulator source
2203 * @min_uV: Minimum required voltage in uV
2204 * @max_uV: Maximum acceptable voltage in uV
2205 *
2206 * Sets a voltage regulator to the desired output voltage. This can be set
2207 * during any regulator state. IOW, regulator can be disabled or enabled.
2208 *
2209 * If the regulator is enabled then the voltage will change to the new value
2210 * immediately otherwise if the regulator is disabled the regulator will
2211 * output at the new voltage when enabled.
2212 *
2213 * NOTE: If the regulator is shared between several devices then the lowest
2214 * request voltage that meets the system constraints will be used.
69279fb9 2215 * Regulator system constraints must be set for this regulator before
414c70cb
LG		 2216 * calling this function otherwise this call will fail.
2217 */
2218int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2219{
2220 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 2221 int ret = 0;
414c70cb
LG		 2222
2223 mutex_lock(&rdev->mutex);
2224
95a3c23a
MB		 2225 /* If we're setting the same range as last time the change
2226 * should be a noop (some cpufreq implementations use the same
2227 * voltage for multiple frequencies, for example).
2228 */
2229 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2230 goto out;
2231
414c70cb 2232 /* sanity check */
e8eef82b
MB		 2233 if (!rdev->desc->ops->set_voltage &&
2234 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 2235 ret = -EINVAL;
2236 goto out;
2237 }
2238
2239 /* constraints check */
2240 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2241 if (ret < 0)
2242 goto out;
2243 regulator->min_uV = min_uV;
2244 regulator->max_uV = max_uV;
3a93f2a9 2245
05fda3b1
TP		 2246 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2247 if (ret < 0)
2248 goto out;
2249
75790251 2250 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
02fa3ec0 2251
414c70cb
LG		 2252out:
2253 mutex_unlock(&rdev->mutex);
2254 return ret;
2255}
2256EXPORT_SYMBOL_GPL(regulator_set_voltage);
2257
88cd222b
LW		 2258/**
2259 * regulator_set_voltage_time - get raise/fall time
2260 * @regulator: regulator source
2261 * @old_uV: starting voltage in microvolts
2262 * @new_uV: target voltage in microvolts
2263 *
2264 * Provided with the starting and ending voltage, this function attempts to
2265 * calculate the time in microseconds required to rise or fall to this new
2266 * voltage.
2267 */
2268int regulator_set_voltage_time(struct regulator *regulator,
2269 int old_uV, int new_uV)
2270{
2271 struct regulator_dev *rdev = regulator->rdev;
2272 struct regulator_ops *ops = rdev->desc->ops;
2273 int old_sel = -1;
2274 int new_sel = -1;
2275 int voltage;
2276 int i;
2277
2278 /* Currently requires operations to do this */
2279 if (!ops->list_voltage || !ops->set_voltage_time_sel
2280 || !rdev->desc->n_voltages)
2281 return -EINVAL;
2282
2283 for (i = 0; i < rdev->desc->n_voltages; i++) {
2284 /* We only look for exact voltage matches here */
2285 voltage = regulator_list_voltage(regulator, i);
2286 if (voltage < 0)
2287 return -EINVAL;
2288 if (voltage == 0)
2289 continue;
2290 if (voltage == old_uV)
2291 old_sel = i;
2292 if (voltage == new_uV)
2293 new_sel = i;
2294 }
2295
2296 if (old_sel < 0 || new_sel < 0)
2297 return -EINVAL;
2298
2299 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2300}
2301EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2302
98a175b6 2303/**
296c6566
RD		 2304 * regulator_set_voltage_time_sel - get raise/fall time
2305 * @rdev: regulator source device
98a175b6
YSB		 2306 * @old_selector: selector for starting voltage
2307 * @new_selector: selector for target voltage
2308 *
2309 * Provided with the starting and target voltage selectors, this function
2310 * returns time in microseconds required to rise or fall to this new voltage
2311 *
f11d08c3 2312 * Drivers providing ramp_delay in regulation_constraints can use this as their
398715ab 2313 * set_voltage_time_sel() operation.
98a175b6
YSB		 2314 */
2315int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2316 unsigned int old_selector,
2317 unsigned int new_selector)
2318{
398715ab 2319 unsigned int ramp_delay = 0;
f11d08c3 2320 int old_volt, new_volt;
398715ab
AL		 2321
2322 if (rdev->constraints->ramp_delay)
2323 ramp_delay = rdev->constraints->ramp_delay;
2324 else if (rdev->desc->ramp_delay)
2325 ramp_delay = rdev->desc->ramp_delay;
2326
2327 if (ramp_delay == 0) {
6f0b2c69 2328 rdev_warn(rdev, "ramp_delay not set\n");
398715ab 2329 return 0;
6f0b2c69 2330 }
398715ab 2331
f11d08c3
AL		 2332 /* sanity check */
2333 if (!rdev->desc->ops->list_voltage)
2334 return -EINVAL;
398715ab 2335
f11d08c3
AL		 2336 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2337 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2338
2339 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
98a175b6 2340}
b19dbf71 2341EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
98a175b6 2342
606a2562
MB		 2343/**
2344 * regulator_sync_voltage - re-apply last regulator output voltage
2345 * @regulator: regulator source
2346 *
2347 * Re-apply the last configured voltage. This is intended to be used
2348 * where some external control source the consumer is cooperating with
2349 * has caused the configured voltage to change.
2350 */
2351int regulator_sync_voltage(struct regulator *regulator)
2352{
2353 struct regulator_dev *rdev = regulator->rdev;
2354 int ret, min_uV, max_uV;
2355
2356 mutex_lock(&rdev->mutex);
2357
2358 if (!rdev->desc->ops->set_voltage &&
2359 !rdev->desc->ops->set_voltage_sel) {
2360 ret = -EINVAL;
2361 goto out;
2362 }
2363
2364 /* This is only going to work if we've had a voltage configured. */
2365 if (!regulator->min_uV && !regulator->max_uV) {
2366 ret = -EINVAL;
2367 goto out;
2368 }
2369
2370 min_uV = regulator->min_uV;
2371 max_uV = regulator->max_uV;
2372
2373 /* This should be a paranoia check... */
2374 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2375 if (ret < 0)
2376 goto out;
2377
2378 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2379 if (ret < 0)
2380 goto out;
2381
2382 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2383
2384out:
2385 mutex_unlock(&rdev->mutex);
2386 return ret;
2387}
2388EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2389
414c70cb
LG		 2390static int _regulator_get_voltage(struct regulator_dev *rdev)
2391{
bf5892a8 2392 int sel, ret;
476c2d83
MB		 2393
2394 if (rdev->desc->ops->get_voltage_sel) {
2395 sel = rdev->desc->ops->get_voltage_sel(rdev);
2396 if (sel < 0)
2397 return sel;
bf5892a8 2398 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 2399 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 2400 ret = rdev->desc->ops->get_voltage(rdev);
f7df20ec
MB		 2401 } else if (rdev->desc->ops->list_voltage) {
2402 ret = rdev->desc->ops->list_voltage(rdev, 0);
cb220d16 2403 } else {
414c70cb 2404 return -EINVAL;
cb220d16 2405 }
bf5892a8 2406
cb220d16
AL		 2407 if (ret < 0)
2408 return ret;
bf5892a8 2409 return ret - rdev->constraints->uV_offset;
414c70cb
LG		 2410}
2411
2412/**
2413 * regulator_get_voltage - get regulator output voltage
2414 * @regulator: regulator source
2415 *
2416 * This returns the current regulator voltage in uV.
2417 *
2418 * NOTE: If the regulator is disabled it will return the voltage value. This
2419 * function should not be used to determine regulator state.
2420 */
2421int regulator_get_voltage(struct regulator *regulator)
2422{
2423 int ret;
2424
2425 mutex_lock(&regulator->rdev->mutex);
2426
2427 ret = _regulator_get_voltage(regulator->rdev);
2428
2429 mutex_unlock(&regulator->rdev->mutex);
2430
2431 return ret;
2432}
2433EXPORT_SYMBOL_GPL(regulator_get_voltage);
2434
2435/**
2436 * regulator_set_current_limit - set regulator output current limit
2437 * @regulator: regulator source
2438 * @min_uA: Minimuum supported current in uA
2439 * @max_uA: Maximum supported current in uA
2440 *
2441 * Sets current sink to the desired output current. This can be set during
2442 * any regulator state. IOW, regulator can be disabled or enabled.
2443 *
2444 * If the regulator is enabled then the current will change to the new value
2445 * immediately otherwise if the regulator is disabled the regulator will
2446 * output at the new current when enabled.
2447 *
2448 * NOTE: Regulator system constraints must be set for this regulator before
2449 * calling this function otherwise this call will fail.
2450 */
2451int regulator_set_current_limit(struct regulator *regulator,
2452 int min_uA, int max_uA)
2453{
2454 struct regulator_dev *rdev = regulator->rdev;
2455 int ret;
2456
2457 mutex_lock(&rdev->mutex);
2458
2459 /* sanity check */
2460 if (!rdev->desc->ops->set_current_limit) {
2461 ret = -EINVAL;
2462 goto out;
2463 }
2464
2465 /* constraints check */
2466 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2467 if (ret < 0)
2468 goto out;
2469
2470 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2471out:
2472 mutex_unlock(&rdev->mutex);
2473 return ret;
2474}
2475EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2476
2477static int _regulator_get_current_limit(struct regulator_dev *rdev)
2478{
2479 int ret;
2480
2481 mutex_lock(&rdev->mutex);
2482
2483 /* sanity check */
2484 if (!rdev->desc->ops->get_current_limit) {
2485 ret = -EINVAL;
2486 goto out;
2487 }
2488
2489 ret = rdev->desc->ops->get_current_limit(rdev);
2490out:
2491 mutex_unlock(&rdev->mutex);
2492 return ret;
2493}
2494
2495/**
2496 * regulator_get_current_limit - get regulator output current
2497 * @regulator: regulator source
2498 *
2499 * This returns the current supplied by the specified current sink in uA.
2500 *
2501 * NOTE: If the regulator is disabled it will return the current value. This
2502 * function should not be used to determine regulator state.
2503 */
2504int regulator_get_current_limit(struct regulator *regulator)
2505{
2506 return _regulator_get_current_limit(regulator->rdev);
2507}
2508EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2509
2510/**
2511 * regulator_set_mode - set regulator operating mode
2512 * @regulator: regulator source
2513 * @mode: operating mode - one of the REGULATOR_MODE constants
2514 *
2515 * Set regulator operating mode to increase regulator efficiency or improve
2516 * regulation performance.
2517 *
2518 * NOTE: Regulator system constraints must be set for this regulator before
2519 * calling this function otherwise this call will fail.
2520 */
2521int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2522{
2523 struct regulator_dev *rdev = regulator->rdev;
2524 int ret;
500b4ac9 2525 int regulator_curr_mode;
414c70cb
LG		 2526
2527 mutex_lock(&rdev->mutex);
2528
2529 /* sanity check */
2530 if (!rdev->desc->ops->set_mode) {
2531 ret = -EINVAL;
2532 goto out;
2533 }
2534
500b4ac9
SI		 2535 /* return if the same mode is requested */
2536 if (rdev->desc->ops->get_mode) {
2537 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2538 if (regulator_curr_mode == mode) {
2539 ret = 0;
2540 goto out;
2541 }
2542 }
2543
414c70cb 2544 /* constraints check */
22c51b47 2545 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 2546 if (ret < 0)
2547 goto out;
2548
2549 ret = rdev->desc->ops->set_mode(rdev, mode);
2550out:
2551 mutex_unlock(&rdev->mutex);
2552 return ret;
2553}
2554EXPORT_SYMBOL_GPL(regulator_set_mode);
2555
2556static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2557{
2558 int ret;
2559
2560 mutex_lock(&rdev->mutex);
2561
2562 /* sanity check */
2563 if (!rdev->desc->ops->get_mode) {
2564 ret = -EINVAL;
2565 goto out;
2566 }
2567
2568 ret = rdev->desc->ops->get_mode(rdev);
2569out:
2570 mutex_unlock(&rdev->mutex);
2571 return ret;
2572}
2573
2574/**
2575 * regulator_get_mode - get regulator operating mode
2576 * @regulator: regulator source
2577 *
2578 * Get the current regulator operating mode.
2579 */
2580unsigned int regulator_get_mode(struct regulator *regulator)
2581{
2582 return _regulator_get_mode(regulator->rdev);
2583}
2584EXPORT_SYMBOL_GPL(regulator_get_mode);
2585
2586/**
2587 * regulator_set_optimum_mode - set regulator optimum operating mode
2588 * @regulator: regulator source
2589 * @uA_load: load current
2590 *
2591 * Notifies the regulator core of a new device load. This is then used by
2592 * DRMS (if enabled by constraints) to set the most efficient regulator
2593 * operating mode for the new regulator loading.
2594 *
2595 * Consumer devices notify their supply regulator of the maximum power
2596 * they will require (can be taken from device datasheet in the power
2597 * consumption tables) when they change operational status and hence power
2598 * state. Examples of operational state changes that can affect power
2599 * consumption are :-
2600 *
2601 * o Device is opened / closed.
2602 * o Device I/O is about to begin or has just finished.
2603 * o Device is idling in between work.
2604 *
2605 * This information is also exported via sysfs to userspace.
2606 *
2607 * DRMS will sum the total requested load on the regulator and change
2608 * to the most efficient operating mode if platform constraints allow.
2609 *
2610 * Returns the new regulator mode or error.
2611 */
2612int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2613{
2614 struct regulator_dev *rdev = regulator->rdev;
2615 struct regulator *consumer;
d92d95b6 2616 int ret, output_uV, input_uV = 0, total_uA_load = 0;
414c70cb
LG		 2617 unsigned int mode;
2618
d92d95b6
SB		 2619 if (rdev->supply)
2620 input_uV = regulator_get_voltage(rdev->supply);
2621
414c70cb
LG		 2622 mutex_lock(&rdev->mutex);
2623
a4b41483
MB		 2624 /*
2625 * first check to see if we can set modes at all, otherwise just
2626 * tell the consumer everything is OK.
2627 */
414c70cb
LG		 2628 regulator->uA_load = uA_load;
2629 ret = regulator_check_drms(rdev);
a4b41483
MB		 2630 if (ret < 0) {
2631 ret = 0;
414c70cb 2632 goto out;
a4b41483 2633 }
414c70cb 2634
414c70cb
LG		 2635 if (!rdev->desc->ops->get_optimum_mode)
2636 goto out;
2637
a4b41483
MB		 2638 /*
2639 * we can actually do this so any errors are indicators of
2640 * potential real failure.
2641 */
2642 ret = -EINVAL;
2643
854ccbae
AL		 2644 if (!rdev->desc->ops->set_mode)
2645 goto out;
2646
414c70cb 2647 /* get output voltage */
1bf5a1f8 2648 output_uV = _regulator_get_voltage(rdev);
414c70cb 2649 if (output_uV <= 0) {
5da84fd9 2650 rdev_err(rdev, "invalid output voltage found\n");
414c70cb
LG		 2651 goto out;
2652 }
2653
d92d95b6 2654 /* No supply? Use constraint voltage */
1bf5a1f8 2655 if (input_uV <= 0)
414c70cb
LG		 2656 input_uV = rdev->constraints->input_uV;
2657 if (input_uV <= 0) {
5da84fd9 2658 rdev_err(rdev, "invalid input voltage found\n");
414c70cb
LG		 2659 goto out;
2660 }
2661
2662 /* calc total requested load for this regulator */
2663 list_for_each_entry(consumer, &rdev->consumer_list, list)
fa2984d4 2664 total_uA_load += consumer->uA_load;
414c70cb
LG		 2665
2666 mode = rdev->desc->ops->get_optimum_mode(rdev,
2667 input_uV, output_uV,
2668 total_uA_load);
2c608234 2669 ret = regulator_mode_constrain(rdev, &mode);
e573520b 2670 if (ret < 0) {
5da84fd9
JP		 2671 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2672 total_uA_load, input_uV, output_uV);
414c70cb
LG		 2673 goto out;
2674 }
2675
2676 ret = rdev->desc->ops->set_mode(rdev, mode);
e573520b 2677 if (ret < 0) {
5da84fd9 2678 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
414c70cb
LG		 2679 goto out;
2680 }
2681 ret = mode;
2682out:
2683 mutex_unlock(&rdev->mutex);
2684 return ret;
2685}
2686EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2687
2688/**
2689 * regulator_register_notifier - register regulator event notifier
2690 * @regulator: regulator source
69279fb9 2691 * @nb: notifier block
414c70cb
LG		 2692 *
2693 * Register notifier block to receive regulator events.
2694 */
2695int regulator_register_notifier(struct regulator *regulator,
2696 struct notifier_block *nb)
2697{
2698 return blocking_notifier_chain_register(&regulator->rdev->notifier,
2699 nb);
2700}
2701EXPORT_SYMBOL_GPL(regulator_register_notifier);
2702
2703/**
2704 * regulator_unregister_notifier - unregister regulator event notifier
2705 * @regulator: regulator source
69279fb9 2706 * @nb: notifier block
414c70cb
LG		 2707 *
2708 * Unregister regulator event notifier block.
2709 */
2710int regulator_unregister_notifier(struct regulator *regulator,
2711 struct notifier_block *nb)
2712{
2713 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2714 nb);
2715}
2716EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2717
b136fb44
JC		 2718/* notify regulator consumers and downstream regulator consumers.
2719 * Note mutex must be held by caller.
2720 */
414c70cb
LG		 2721static void _notifier_call_chain(struct regulator_dev *rdev,
2722 unsigned long event, void *data)
2723{
414c70cb 2724 /* call rdev chain first */
d8493d21 2725 blocking_notifier_call_chain(&rdev->notifier, event, data);
414c70cb
LG		 2726}
2727
2728/**
2729 * regulator_bulk_get - get multiple regulator consumers
2730 *
2731 * @dev: Device to supply
2732 * @num_consumers: Number of consumers to register
2733 * @consumers: Configuration of consumers; clients are stored here.
2734 *
2735 * @return 0 on success, an errno on failure.
2736 *
2737 * This helper function allows drivers to get several regulator
2738 * consumers in one operation. If any of the regulators cannot be
2739 * acquired then any regulators that were allocated will be freed
2740 * before returning to the caller.
2741 */
2742int regulator_bulk_get(struct device *dev, int num_consumers,
2743 struct regulator_bulk_data *consumers)
2744{
2745 int i;
2746 int ret;
2747
2748 for (i = 0; i < num_consumers; i++)
2749 consumers[i].consumer = NULL;
2750
2751 for (i = 0; i < num_consumers; i++) {
2752 consumers[i].consumer = regulator_get(dev,
2753 consumers[i].supply);
2754 if (IS_ERR(consumers[i].consumer)) {
414c70cb 2755 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 2756 dev_err(dev, "Failed to get supply '%s': %d\n",
2757 consumers[i].supply, ret);
414c70cb
LG		 2758 consumers[i].consumer = NULL;
2759 goto err;
2760 }
2761 }
2762
2763 return 0;
2764
2765err:
b29c7690 2766 while (--i >= 0)
414c70cb
LG		 2767 regulator_put(consumers[i].consumer);
2768
2769 return ret;
2770}
2771EXPORT_SYMBOL_GPL(regulator_bulk_get);
2772
e6e74030
MB		 2773/**
2774 * devm_regulator_bulk_get - managed get multiple regulator consumers
2775 *
2776 * @dev: Device to supply
2777 * @num_consumers: Number of consumers to register
2778 * @consumers: Configuration of consumers; clients are stored here.
2779 *
2780 * @return 0 on success, an errno on failure.
2781 *
2782 * This helper function allows drivers to get several regulator
2783 * consumers in one operation with management, the regulators will
2784 * automatically be freed when the device is unbound. If any of the
2785 * regulators cannot be acquired then any regulators that were
2786 * allocated will be freed before returning to the caller.
2787 */
2788int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2789 struct regulator_bulk_data *consumers)
2790{
2791 int i;
2792 int ret;
2793
2794 for (i = 0; i < num_consumers; i++)
2795 consumers[i].consumer = NULL;
2796
2797 for (i = 0; i < num_consumers; i++) {
2798 consumers[i].consumer = devm_regulator_get(dev,
2799 consumers[i].supply);
2800 if (IS_ERR(consumers[i].consumer)) {
2801 ret = PTR_ERR(consumers[i].consumer);
2802 dev_err(dev, "Failed to get supply '%s': %d\n",
2803 consumers[i].supply, ret);
2804 consumers[i].consumer = NULL;
2805 goto err;
2806 }
2807 }
2808
2809 return 0;
2810
2811err:
2812 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2813 devm_regulator_put(consumers[i].consumer);
2814
2815 return ret;
2816}
2817EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2818
f21e0e81
MB		 2819static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2820{
2821 struct regulator_bulk_data *bulk = data;
2822
2823 bulk->ret = regulator_enable(bulk->consumer);
2824}
2825
414c70cb
LG		 2826/**
2827 * regulator_bulk_enable - enable multiple regulator consumers
2828 *
2829 * @num_consumers: Number of consumers
2830 * @consumers: Consumer data; clients are stored here.
2831 * @return 0 on success, an errno on failure
2832 *
2833 * This convenience API allows consumers to enable multiple regulator
2834 * clients in a single API call. If any consumers cannot be enabled
2835 * then any others that were enabled will be disabled again prior to
2836 * return.
2837 */
2838int regulator_bulk_enable(int num_consumers,
2839 struct regulator_bulk_data *consumers)
2840{
2955b47d 2841 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
414c70cb 2842 int i;
f21e0e81 2843 int ret = 0;
414c70cb 2844
6492bc1b
MB		 2845 for (i = 0; i < num_consumers; i++) {
2846 if (consumers[i].consumer->always_on)
2847 consumers[i].ret = 0;
2848 else
2849 async_schedule_domain(regulator_bulk_enable_async,
2850 &consumers[i], &async_domain);
2851 }
f21e0e81
MB		 2852
2853 async_synchronize_full_domain(&async_domain);
2854
2855 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 2856 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 2857 if (consumers[i].ret != 0) {
2858 ret = consumers[i].ret;
414c70cb 2859 goto err;
f21e0e81 2860 }
414c70cb
LG		 2861 }
2862
2863 return 0;
2864
2865err:
b29c7690
AL		 2866 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2867 while (--i >= 0)
2868 regulator_disable(consumers[i].consumer);
414c70cb
LG		 2869
2870 return ret;
2871}
2872EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2873
2874/**
2875 * regulator_bulk_disable - disable multiple regulator consumers
2876 *
2877 * @num_consumers: Number of consumers
2878 * @consumers: Consumer data; clients are stored here.
2879 * @return 0 on success, an errno on failure
2880 *
2881 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 2882 * clients in a single API call. If any consumers cannot be disabled
2883 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 2884 * return.
2885 */
2886int regulator_bulk_disable(int num_consumers,
2887 struct regulator_bulk_data *consumers)
2888{
2889 int i;
01e86f49 2890 int ret, r;
414c70cb 2891
49e22632 2892 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 2893 ret = regulator_disable(consumers[i].consumer);
2894 if (ret != 0)
2895 goto err;
2896 }
2897
2898 return 0;
2899
2900err:
5da84fd9 2901 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
01e86f49
MB		 2902 for (++i; i < num_consumers; ++i) {
2903 r = regulator_enable(consumers[i].consumer);
2904 if (r != 0)
2905 pr_err("Failed to reename %s: %d\n",
2906 consumers[i].supply, r);
2907 }
414c70cb
LG		 2908
2909 return ret;
2910}
2911EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2912
e1de2f42
DK		 2913/**
2914 * regulator_bulk_force_disable - force disable multiple regulator consumers
2915 *
2916 * @num_consumers: Number of consumers
2917 * @consumers: Consumer data; clients are stored here.
2918 * @return 0 on success, an errno on failure
2919 *
2920 * This convenience API allows consumers to forcibly disable multiple regulator
2921 * clients in a single API call.
2922 * NOTE: This should be used for situations when device damage will
2923 * likely occur if the regulators are not disabled (e.g. over temp).
2924 * Although regulator_force_disable function call for some consumers can
2925 * return error numbers, the function is called for all consumers.
2926 */
2927int regulator_bulk_force_disable(int num_consumers,
2928 struct regulator_bulk_data *consumers)
2929{
2930 int i;
2931 int ret;
2932
2933 for (i = 0; i < num_consumers; i++)
2934 consumers[i].ret =
2935 regulator_force_disable(consumers[i].consumer);
2936
2937 for (i = 0; i < num_consumers; i++) {
2938 if (consumers[i].ret != 0) {
2939 ret = consumers[i].ret;
2940 goto out;
2941 }
2942 }
2943
2944 return 0;
2945out:
2946 return ret;
2947}
2948EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
2949
414c70cb
LG		 2950/**
2951 * regulator_bulk_free - free multiple regulator consumers
2952 *
2953 * @num_consumers: Number of consumers
2954 * @consumers: Consumer data; clients are stored here.
2955 *
2956 * This convenience API allows consumers to free multiple regulator
2957 * clients in a single API call.
2958 */
2959void regulator_bulk_free(int num_consumers,
2960 struct regulator_bulk_data *consumers)
2961{
2962 int i;
2963
2964 for (i = 0; i < num_consumers; i++) {
2965 regulator_put(consumers[i].consumer);
2966 consumers[i].consumer = NULL;
2967 }
2968}
2969EXPORT_SYMBOL_GPL(regulator_bulk_free);
2970
2971/**
2972 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 2973 * @rdev: regulator source
414c70cb 2974 * @event: notifier block
69279fb9 2975 * @data: callback-specific data.
414c70cb
LG		 2976 *
2977 * Called by regulator drivers to notify clients a regulator event has
2978 * occurred. We also notify regulator clients downstream.
b136fb44 2979 * Note lock must be held by caller.
414c70cb
LG		 2980 */
2981int regulator_notifier_call_chain(struct regulator_dev *rdev,
2982 unsigned long event, void *data)
2983{
2984 _notifier_call_chain(rdev, event, data);
2985 return NOTIFY_DONE;
2986
2987}
2988EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2989
be721979
MB		 2990/**
2991 * regulator_mode_to_status - convert a regulator mode into a status
2992 *
2993 * @mode: Mode to convert
2994 *
2995 * Convert a regulator mode into a status.
2996 */
2997int regulator_mode_to_status(unsigned int mode)
2998{
2999 switch (mode) {
3000 case REGULATOR_MODE_FAST:
3001 return REGULATOR_STATUS_FAST;
3002 case REGULATOR_MODE_NORMAL:
3003 return REGULATOR_STATUS_NORMAL;
3004 case REGULATOR_MODE_IDLE:
3005 return REGULATOR_STATUS_IDLE;
03ffcf3d 3006 case REGULATOR_MODE_STANDBY:
be721979
MB		 3007 return REGULATOR_STATUS_STANDBY;
3008 default:
1beaf762 3009 return REGULATOR_STATUS_UNDEFINED;
be721979
MB		 3010 }
3011}
3012EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3013
7ad68e2f
DB		 3014/*
3015 * To avoid cluttering sysfs (and memory) with useless state, only
3016 * create attributes that can be meaningfully displayed.
3017 */
3018static int add_regulator_attributes(struct regulator_dev *rdev)
3019{
3020 struct device *dev = &rdev->dev;
3021 struct regulator_ops *ops = rdev->desc->ops;
3022 int status = 0;
3023
3024 /* some attributes need specific methods to be displayed */
4c78899b 3025 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
f2889e65
MB		 3026 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3027 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) {
7ad68e2f
DB		 3028 status = device_create_file(dev, &dev_attr_microvolts);
3029 if (status < 0)
3030 return status;
3031 }
3032 if (ops->get_current_limit) {
3033 status = device_create_file(dev, &dev_attr_microamps);
3034 if (status < 0)
3035 return status;
3036 }
3037 if (ops->get_mode) {
3038 status = device_create_file(dev, &dev_attr_opmode);
3039 if (status < 0)
3040 return status;
3041 }
3042 if (ops->is_enabled) {
3043 status = device_create_file(dev, &dev_attr_state);
3044 if (status < 0)
3045 return status;
3046 }
853116a1
DB		 3047 if (ops->get_status) {
3048 status = device_create_file(dev, &dev_attr_status);
3049 if (status < 0)
3050 return status;
3051 }
7ad68e2f
DB		 3052
3053 /* some attributes are type-specific */
3054 if (rdev->desc->type == REGULATOR_CURRENT) {
3055 status = device_create_file(dev, &dev_attr_requested_microamps);
3056 if (status < 0)
3057 return status;
3058 }
3059
3060 /* all the other attributes exist to support constraints;
3061 * don't show them if there are no constraints, or if the
3062 * relevant supporting methods are missing.
3063 */
3064 if (!rdev->constraints)
3065 return status;
3066
3067 /* constraints need specific supporting methods */
e8eef82b 3068 if (ops->set_voltage || ops->set_voltage_sel) {
7ad68e2f
DB		 3069 status = device_create_file(dev, &dev_attr_min_microvolts);
3070 if (status < 0)
3071 return status;
3072 status = device_create_file(dev, &dev_attr_max_microvolts);
3073 if (status < 0)
3074 return status;
3075 }
3076 if (ops->set_current_limit) {
3077 status = device_create_file(dev, &dev_attr_min_microamps);
3078 if (status < 0)
3079 return status;
3080 status = device_create_file(dev, &dev_attr_max_microamps);
3081 if (status < 0)
3082 return status;
3083 }
3084
7ad68e2f
DB		 3085 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3086 if (status < 0)
3087 return status;
3088 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3089 if (status < 0)
3090 return status;
3091 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3092 if (status < 0)
3093 return status;
3094
3095 if (ops->set_suspend_voltage) {
3096 status = device_create_file(dev,
3097 &dev_attr_suspend_standby_microvolts);
3098 if (status < 0)
3099 return status;
3100 status = device_create_file(dev,
3101 &dev_attr_suspend_mem_microvolts);
3102 if (status < 0)
3103 return status;
3104 status = device_create_file(dev,
3105 &dev_attr_suspend_disk_microvolts);
3106 if (status < 0)
3107 return status;
3108 }
3109
3110 if (ops->set_suspend_mode) {
3111 status = device_create_file(dev,
3112 &dev_attr_suspend_standby_mode);
3113 if (status < 0)
3114 return status;
3115 status = device_create_file(dev,
3116 &dev_attr_suspend_mem_mode);
3117 if (status < 0)
3118 return status;
3119 status = device_create_file(dev,
3120 &dev_attr_suspend_disk_mode);
3121 if (status < 0)
3122 return status;
3123 }
3124
3125 return status;
3126}
3127
1130e5b3
MB		 3128static void rdev_init_debugfs(struct regulator_dev *rdev)
3129{
1130e5b3 3130 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
24751434 3131 if (!rdev->debugfs) {
1130e5b3 3132 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 3133 return;
3134 }
3135
3136 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3137 &rdev->use_count);
3138 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3139 &rdev->open_count);
1130e5b3
MB		 3140}
3141
414c70cb
LG		 3142/**
3143 * regulator_register - register regulator
69279fb9 3144 * @regulator_desc: regulator to register
c172708d 3145 * @config: runtime configuration for regulator
414c70cb
LG		 3146 *
3147 * Called by regulator drivers to register a regulator.
3148 * Returns 0 on success.
3149 */
65f26846
MB		 3150struct regulator_dev *
3151regulator_register(const struct regulator_desc *regulator_desc,
c172708d 3152 const struct regulator_config *config)
414c70cb 3153{
9a8f5e07 3154 const struct regulation_constraints *constraints = NULL;
c172708d 3155 const struct regulator_init_data *init_data;
414c70cb
LG		 3156 static atomic_t regulator_no = ATOMIC_INIT(0);
3157 struct regulator_dev *rdev;
32c8fad4 3158 struct device *dev;
a5766f11 3159 int ret, i;
69511a45 3160 const char *supply = NULL;
414c70cb 3161
c172708d 3162 if (regulator_desc == NULL || config == NULL)
414c70cb
LG		 3163 return ERR_PTR(-EINVAL);
3164
32c8fad4 3165 dev = config->dev;
dcf70112 3166 WARN_ON(!dev);
32c8fad4 3167
414c70cb
LG		 3168 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3169 return ERR_PTR(-EINVAL);
3170
cd78dfc6
DL		 3171 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3172 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 3173 return ERR_PTR(-EINVAL);
3174
476c2d83
MB		 3175 /* Only one of each should be implemented */
3176 WARN_ON(regulator_desc->ops->get_voltage &&
3177 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 3178 WARN_ON(regulator_desc->ops->set_voltage &&
3179 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 3180
3181 /* If we're using selectors we must implement list_voltage. */
3182 if (regulator_desc->ops->get_voltage_sel &&
3183 !regulator_desc->ops->list_voltage) {
3184 return ERR_PTR(-EINVAL);
3185 }
e8eef82b
MB		 3186 if (regulator_desc->ops->set_voltage_sel &&
3187 !regulator_desc->ops->list_voltage) {
3188 return ERR_PTR(-EINVAL);
3189 }
476c2d83 3190
c172708d
MB		 3191 init_data = config->init_data;
3192
414c70cb
LG		 3193 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3194 if (rdev == NULL)
3195 return ERR_PTR(-ENOMEM);
3196
3197 mutex_lock(&regulator_list_mutex);
3198
3199 mutex_init(&rdev->mutex);
c172708d 3200 rdev->reg_data = config->driver_data;
414c70cb
LG		 3201 rdev->owner = regulator_desc->owner;
3202 rdev->desc = regulator_desc;
3a4b0a07
MB		 3203 if (config->regmap)
3204 rdev->regmap = config->regmap;
3205 else
3206 rdev->regmap = dev_get_regmap(dev, NULL);
414c70cb 3207 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 3208 INIT_LIST_HEAD(&rdev->list);
414c70cb 3209 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 3210 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 3211
a5766f11 3212 /* preform any regulator specific init */
9a8f5e07 3213 if (init_data && init_data->regulator_init) {
a5766f11 3214 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 3215 if (ret < 0)
3216 goto clean;
a5766f11
LG		 3217 }
3218
a5766f11 3219 /* register with sysfs */
414c70cb 3220 rdev->dev.class = &regulator_class;
c172708d 3221 rdev->dev.of_node = config->of_node;
a5766f11 3222 rdev->dev.parent = dev;
812460a9
KS		 3223 dev_set_name(&rdev->dev, "regulator.%d",
3224 atomic_inc_return(&regulator_no) - 1);
a5766f11 3225 ret = device_register(&rdev->dev);
ad7725cb
VK		 3226 if (ret != 0) {
3227 put_device(&rdev->dev);
4fca9545 3228 goto clean;
ad7725cb 3229 }
a5766f11
LG		 3230
3231 dev_set_drvdata(&rdev->dev, rdev);
3232
65f73508
MB		 3233 if (config->ena_gpio) {
3234 ret = gpio_request_one(config->ena_gpio,
3235 GPIOF_DIR_OUT | config->ena_gpio_flags,
3236 rdev_get_name(rdev));
3237 if (ret != 0) {
3238 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3239 config->ena_gpio, ret);
3240 goto clean;
3241 }
3242
3243 rdev->ena_gpio = config->ena_gpio;
3244 rdev->ena_gpio_invert = config->ena_gpio_invert;
3245
3246 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3247 rdev->ena_gpio_state = 1;
3248
3249 if (rdev->ena_gpio_invert)
3250 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3251 }
3252
74f544c1 3253 /* set regulator constraints */
9a8f5e07
MB		 3254 if (init_data)
3255 constraints = &init_data->constraints;
3256
3257 ret = set_machine_constraints(rdev, constraints);
74f544c1
MR		 3258 if (ret < 0)
3259 goto scrub;
3260
7ad68e2f
DB		 3261 /* add attributes supported by this regulator */
3262 ret = add_regulator_attributes(rdev);
3263 if (ret < 0)
3264 goto scrub;
3265
9a8f5e07 3266 if (init_data && init_data->supply_regulator)
69511a45
RN		 3267 supply = init_data->supply_regulator;
3268 else if (regulator_desc->supply_name)
3269 supply = regulator_desc->supply_name;
3270
3271 if (supply) {
0178f3e2 3272 struct regulator_dev *r;
0178f3e2 3273
6d191a5f 3274 r = regulator_dev_lookup(dev, supply, &ret);
0178f3e2 3275
69511a45
RN		 3276 if (!r) {
3277 dev_err(dev, "Failed to find supply %s\n", supply);
04bf3011 3278 ret = -EPROBE_DEFER;
0178f3e2
MB		 3279 goto scrub;
3280 }
3281
3282 ret = set_supply(rdev, r);
3283 if (ret < 0)
3284 goto scrub;
b2296bd4
LD		 3285
3286 /* Enable supply if rail is enabled */
b1a86831 3287 if (_regulator_is_enabled(rdev)) {
b2296bd4
LD		 3288 ret = regulator_enable(rdev->supply);
3289 if (ret < 0)
3290 goto scrub;
3291 }
0178f3e2
MB		 3292 }
3293
a5766f11 3294 /* add consumers devices */
9a8f5e07
MB		 3295 if (init_data) {
3296 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3297 ret = set_consumer_device_supply(rdev,
9a8f5e07 3298 init_data->consumer_supplies[i].dev_name,
23c2f041 3299 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 3300 if (ret < 0) {
3301 dev_err(dev, "Failed to set supply %s\n",
3302 init_data->consumer_supplies[i].supply);
3303 goto unset_supplies;
3304 }
23c2f041 3305 }
414c70cb 3306 }
a5766f11
LG		 3307
3308 list_add(&rdev->list, &regulator_list);
1130e5b3
MB		 3309
3310 rdev_init_debugfs(rdev);
a5766f11 3311out:
414c70cb
LG		 3312 mutex_unlock(&regulator_list_mutex);
3313 return rdev;
4fca9545 3314
d4033b54
JN		 3315unset_supplies:
3316 unset_regulator_supplies(rdev);
3317
4fca9545 3318scrub:
e81dba85
MB		 3319 if (rdev->supply)
3320 regulator_put(rdev->supply);
65f73508
MB		 3321 if (rdev->ena_gpio)
3322 gpio_free(rdev->ena_gpio);
1a6958e7 3323 kfree(rdev->constraints);
4fca9545 3324 device_unregister(&rdev->dev);
53032daf
PW		 3325 /* device core frees rdev */
3326 rdev = ERR_PTR(ret);
3327 goto out;
3328
4fca9545
DB		 3329clean:
3330 kfree(rdev);
3331 rdev = ERR_PTR(ret);
3332 goto out;
414c70cb
LG		 3333}
3334EXPORT_SYMBOL_GPL(regulator_register);
3335
3336/**
3337 * regulator_unregister - unregister regulator
69279fb9 3338 * @rdev: regulator to unregister
414c70cb
LG		 3339 *
3340 * Called by regulator drivers to unregister a regulator.
3341 */
3342void regulator_unregister(struct regulator_dev *rdev)
3343{
3344 if (rdev == NULL)
3345 return;
3346
e032b376
MB		 3347 if (rdev->supply)
3348 regulator_put(rdev->supply);
414c70cb 3349 mutex_lock(&regulator_list_mutex);
1130e5b3 3350 debugfs_remove_recursive(rdev->debugfs);
da07ecd9 3351 flush_work_sync(&rdev->disable_work.work);
6bf87d17 3352 WARN_ON(rdev->open_count);
0f1d747b 3353 unset_regulator_supplies(rdev);
414c70cb 3354 list_del(&rdev->list);
f8c12fe3 3355 kfree(rdev->constraints);
65f73508
MB		 3356 if (rdev->ena_gpio)
3357 gpio_free(rdev->ena_gpio);
58fb5cf5 3358 device_unregister(&rdev->dev);
414c70cb
LG		 3359 mutex_unlock(&regulator_list_mutex);
3360}
3361EXPORT_SYMBOL_GPL(regulator_unregister);
3362
414c70cb 3363/**
cf7bbcdf 3364 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 3365 * @state: system suspend state
3366 *
3367 * Configure each regulator with it's suspend operating parameters for state.
3368 * This will usually be called by machine suspend code prior to supending.
3369 */
3370int regulator_suspend_prepare(suspend_state_t state)
3371{
3372 struct regulator_dev *rdev;
3373 int ret = 0;
3374
3375 /* ON is handled by regulator active state */
3376 if (state == PM_SUSPEND_ON)
3377 return -EINVAL;
3378
3379 mutex_lock(&regulator_list_mutex);
3380 list_for_each_entry(rdev, &regulator_list, list) {
3381
3382 mutex_lock(&rdev->mutex);
3383 ret = suspend_prepare(rdev, state);
3384 mutex_unlock(&rdev->mutex);
3385
3386 if (ret < 0) {
5da84fd9 3387 rdev_err(rdev, "failed to prepare\n");
414c70cb
LG		 3388 goto out;
3389 }
3390 }
3391out:
3392 mutex_unlock(&regulator_list_mutex);
3393 return ret;
3394}
3395EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3396
7a32b589
MH		 3397/**
3398 * regulator_suspend_finish - resume regulators from system wide suspend
3399 *
3400 * Turn on regulators that might be turned off by regulator_suspend_prepare
3401 * and that should be turned on according to the regulators properties.
3402 */
3403int regulator_suspend_finish(void)
3404{
3405 struct regulator_dev *rdev;
3406 int ret = 0, error;
3407
3408 mutex_lock(&regulator_list_mutex);
3409 list_for_each_entry(rdev, &regulator_list, list) {
3410 struct regulator_ops *ops = rdev->desc->ops;
3411
3412 mutex_lock(&rdev->mutex);
3413 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3414 ops->enable) {
3415 error = ops->enable(rdev);
3416 if (error)
3417 ret = error;
3418 } else {
3419 if (!has_full_constraints)
3420 goto unlock;
3421 if (!ops->disable)
3422 goto unlock;
b1a86831 3423 if (!_regulator_is_enabled(rdev))
7a32b589
MH		 3424 goto unlock;
3425
3426 error = ops->disable(rdev);
3427 if (error)
3428 ret = error;
3429 }
3430unlock:
3431 mutex_unlock(&rdev->mutex);
3432 }
3433 mutex_unlock(&regulator_list_mutex);
3434 return ret;
3435}
3436EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3437
ca725561
MB		 3438/**
3439 * regulator_has_full_constraints - the system has fully specified constraints
3440 *
3441 * Calling this function will cause the regulator API to disable all
3442 * regulators which have a zero use count and don't have an always_on
3443 * constraint in a late_initcall.
3444 *
3445 * The intention is that this will become the default behaviour in a
3446 * future kernel release so users are encouraged to use this facility
3447 * now.
3448 */
3449void regulator_has_full_constraints(void)
3450{
3451 has_full_constraints = 1;
3452}
3453EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3454
688fe99a
MB		 3455/**
3456 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3457 *
3458 * Calling this function will cause the regulator API to provide a
3459 * dummy regulator to consumers if no physical regulator is found,
3460 * allowing most consumers to proceed as though a regulator were
3461 * configured. This allows systems such as those with software
3462 * controllable regulators for the CPU core only to be brought up more
3463 * readily.
3464 */
3465void regulator_use_dummy_regulator(void)
3466{
3467 board_wants_dummy_regulator = true;
3468}
3469EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3470
414c70cb
LG		 3471/**
3472 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 3473 * @rdev: regulator
414c70cb
LG		 3474 *
3475 * Get rdev regulator driver private data. This call can be used in the
3476 * regulator driver context.
3477 */
3478void *rdev_get_drvdata(struct regulator_dev *rdev)
3479{
3480 return rdev->reg_data;
3481}
3482EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3483
3484/**
3485 * regulator_get_drvdata - get regulator driver data
3486 * @regulator: regulator
3487 *
3488 * Get regulator driver private data. This call can be used in the consumer
3489 * driver context when non API regulator specific functions need to be called.
3490 */
3491void *regulator_get_drvdata(struct regulator *regulator)
3492{
3493 return regulator->rdev->reg_data;
3494}
3495EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3496
3497/**
3498 * regulator_set_drvdata - set regulator driver data
3499 * @regulator: regulator
3500 * @data: data
3501 */
3502void regulator_set_drvdata(struct regulator *regulator, void *data)
3503{
3504 regulator->rdev->reg_data = data;
3505}
3506EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3507
3508/**
3509 * regulator_get_id - get regulator ID
69279fb9 3510 * @rdev: regulator
414c70cb
LG		 3511 */
3512int rdev_get_id(struct regulator_dev *rdev)
3513{
3514 return rdev->desc->id;
3515}
3516EXPORT_SYMBOL_GPL(rdev_get_id);
3517
a5766f11
LG		 3518struct device *rdev_get_dev(struct regulator_dev *rdev)
3519{
3520 return &rdev->dev;
3521}
3522EXPORT_SYMBOL_GPL(rdev_get_dev);
3523
3524void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3525{
3526 return reg_init_data->driver_data;
3527}
3528EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3529
ba55a974
MB		 3530#ifdef CONFIG_DEBUG_FS
3531static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3532 size_t count, loff_t *ppos)
3533{
3534 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3535 ssize_t len, ret = 0;
3536 struct regulator_map *map;
3537
3538 if (!buf)
3539 return -ENOMEM;
3540
3541 list_for_each_entry(map, &regulator_map_list, list) {
3542 len = snprintf(buf + ret, PAGE_SIZE - ret,
3543 "%s -> %s.%s\n",
3544 rdev_get_name(map->regulator), map->dev_name,
3545 map->supply);
3546 if (len >= 0)
3547 ret += len;
3548 if (ret > PAGE_SIZE) {
3549 ret = PAGE_SIZE;
3550 break;
3551 }
3552 }
3553
3554 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3555
3556 kfree(buf);
3557
3558 return ret;
3559}
24751434 3560#endif
ba55a974
MB		 3561
3562static const struct file_operations supply_map_fops = {
24751434 3563#ifdef CONFIG_DEBUG_FS
ba55a974
MB		 3564 .read = supply_map_read_file,
3565 .llseek = default_llseek,
ba55a974 3566#endif
24751434 3567};
ba55a974 3568
414c70cb
LG		 3569static int __init regulator_init(void)
3570{
34abbd68
MB		 3571 int ret;
3572
34abbd68
MB		 3573 ret = class_register(&regulator_class);
3574
1130e5b3 3575 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 3576 if (!debugfs_root)
1130e5b3 3577 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 3578
f4d562c6
MB		 3579 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3580 &supply_map_fops);
1130e5b3 3581
34abbd68
MB		 3582 regulator_dummy_init();
3583
3584 return ret;
414c70cb
LG		 3585}
3586
3587/* init early to allow our consumers to complete system booting */
3588core_initcall(regulator_init);
ca725561
MB		 3589
3590static int __init regulator_init_complete(void)
3591{
3592 struct regulator_dev *rdev;
3593 struct regulator_ops *ops;
3594 struct regulation_constraints *c;
3595 int enabled, ret;
ca725561 3596
86f5fcfc
MB		 3597 /*
3598 * Since DT doesn't provide an idiomatic mechanism for
3599 * enabling full constraints and since it's much more natural
3600 * with DT to provide them just assume that a DT enabled
3601 * system has full constraints.
3602 */
3603 if (of_have_populated_dt())
3604 has_full_constraints = true;
3605
ca725561
MB		 3606 mutex_lock(&regulator_list_mutex);
3607
3608 /* If we have a full configuration then disable any regulators
3609 * which are not in use or always_on. This will become the
3610 * default behaviour in the future.
3611 */
3612 list_for_each_entry(rdev, &regulator_list, list) {
3613 ops = rdev->desc->ops;
3614 c = rdev->constraints;
3615
f25e0b4f 3616 if (!ops->disable || (c && c->always_on))
ca725561
MB		 3617 continue;
3618
3619 mutex_lock(&rdev->mutex);
3620
3621 if (rdev->use_count)
3622 goto unlock;
3623
3624 /* If we can't read the status assume it's on. */
3625 if (ops->is_enabled)
3626 enabled = ops->is_enabled(rdev);
3627 else
3628 enabled = 1;
3629
3630 if (!enabled)
3631 goto unlock;
3632
3633 if (has_full_constraints) {
3634 /* We log since this may kill the system if it
3635 * goes wrong. */
5da84fd9 3636 rdev_info(rdev, "disabling\n");
ca725561
MB		 3637 ret = ops->disable(rdev);
3638 if (ret != 0) {
5da84fd9 3639 rdev_err(rdev, "couldn't disable: %d\n", ret);
ca725561
MB		 3640 }
3641 } else {
3642 /* The intention is that in future we will
3643 * assume that full constraints are provided
3644 * so warn even if we aren't going to do
3645 * anything here.
3646 */
5da84fd9 3647 rdev_warn(rdev, "incomplete constraints, leaving on\n");
ca725561
MB		 3648 }
3649
3650unlock:
3651 mutex_unlock(&rdev->mutex);
3652 }
3653
3654 mutex_unlock(&regulator_list_mutex);
3655
3656 return 0;
3657}
3658late_initcall(regulator_init_complete);
Linux 6.x block layer and io_uring tree(s)