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Merge branch 'pm-fixes'
[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);
f19b00da 54static LIST_HEAD(regulator_ena_gpio_list);
21cf891a 55static bool has_full_constraints;
688fe99a 56static bool board_wants_dummy_regulator;
414c70cb 57
1130e5b3 58static struct dentry *debugfs_root;
1130e5b3 59
8dc5390d 60/*
414c70cb
LG		 61 * struct regulator_map
62 *
63 * Used to provide symbolic supply names to devices.
64 */
65struct regulator_map {
66 struct list_head list;
40f9244f 67 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 68 const char *supply;
a5766f11 69 struct regulator_dev *regulator;
414c70cb
LG		 70};
71
f19b00da
KM		 72/*
73 * struct regulator_enable_gpio
74 *
75 * Management for shared enable GPIO pin
76 */
77struct regulator_enable_gpio {
78 struct list_head list;
79 int gpio;
80 u32 enable_count; /* a number of enabled shared GPIO */
81 u32 request_count; /* a number of requested shared GPIO */
82 unsigned int ena_gpio_invert:1;
83};
84
414c70cb
LG		 85/*
86 * struct regulator
87 *
88 * One for each consumer device.
89 */
90struct regulator {
91 struct device *dev;
92 struct list_head list;
6492bc1b 93 unsigned int always_on:1;
f59c8f9f 94 unsigned int bypass:1;
414c70cb
LG		 95 int uA_load;
96 int min_uV;
97 int max_uV;
414c70cb
LG		 98 char *supply_name;
99 struct device_attribute dev_attr;
100 struct regulator_dev *rdev;
5de70519 101 struct dentry *debugfs;
414c70cb
LG		 102};
103
104static int _regulator_is_enabled(struct regulator_dev *rdev);
3801b86a 105static int _regulator_disable(struct regulator_dev *rdev);
414c70cb
LG		 106static int _regulator_get_voltage(struct regulator_dev *rdev);
107static int _regulator_get_current_limit(struct regulator_dev *rdev);
108static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
109static void _notifier_call_chain(struct regulator_dev *rdev,
110 unsigned long event, void *data);
75790251
MB		 111static int _regulator_do_set_voltage(struct regulator_dev *rdev,
112 int min_uV, int max_uV);
3801b86a
MB		 113static struct regulator *create_regulator(struct regulator_dev *rdev,
114 struct device *dev,
115 const char *supply_name);
414c70cb 116
1083c393
MB		 117static const char *rdev_get_name(struct regulator_dev *rdev)
118{
119 if (rdev->constraints && rdev->constraints->name)
120 return rdev->constraints->name;
121 else if (rdev->desc->name)
122 return rdev->desc->name;
123 else
124 return "";
125}
126
69511a45
RN		 127/**
128 * of_get_regulator - get a regulator device node based on supply name
129 * @dev: Device pointer for the consumer (of regulator) device
130 * @supply: regulator supply name
131 *
132 * Extract the regulator device node corresponding to the supply name.
167d41dc 133 * returns the device node corresponding to the regulator if found, else
69511a45
RN		 134 * returns NULL.
135 */
136static struct device_node *of_get_regulator(struct device *dev, const char *supply)
137{
138 struct device_node *regnode = NULL;
139 char prop_name[32]; /* 32 is max size of property name */
140
141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
142
143 snprintf(prop_name, 32, "%s-supply", supply);
144 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
145
146 if (!regnode) {
16fbcc3b 147 dev_dbg(dev, "Looking up %s property in node %s failed",
69511a45
RN		 148 prop_name, dev->of_node->full_name);
149 return NULL;
150 }
151 return regnode;
152}
153
6492bc1b
MB		 154static int _regulator_can_change_status(struct regulator_dev *rdev)
155{
156 if (!rdev->constraints)
157 return 0;
158
159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
160 return 1;
161 else
162 return 0;
163}
164
414c70cb
LG		 165/* Platform voltage constraint check */
166static int regulator_check_voltage(struct regulator_dev *rdev,
167 int *min_uV, int *max_uV)
168{
169 BUG_ON(*min_uV > *max_uV);
170
171 if (!rdev->constraints) {
5da84fd9 172 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 173 return -ENODEV;
174 }
175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
5da84fd9 176 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 177 return -EPERM;
178 }
179
180 if (*max_uV > rdev->constraints->max_uV)
181 *max_uV = rdev->constraints->max_uV;
182 if (*min_uV < rdev->constraints->min_uV)
183 *min_uV = rdev->constraints->min_uV;
184
89f425ed
MB		 185 if (*min_uV > *max_uV) {
186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 187 *min_uV, *max_uV);
414c70cb 188 return -EINVAL;
89f425ed 189 }
414c70cb
LG		 190
191 return 0;
192}
193
05fda3b1
TP		 194/* Make sure we select a voltage that suits the needs of all
195 * regulator consumers
196 */
197static int regulator_check_consumers(struct regulator_dev *rdev,
198 int *min_uV, int *max_uV)
199{
200 struct regulator *regulator;
201
202 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4aa922c0
MB		 203 /*
204 * Assume consumers that didn't say anything are OK
205 * with anything in the constraint range.
206 */
207 if (!regulator->min_uV && !regulator->max_uV)
208 continue;
209
05fda3b1
TP		 210 if (*max_uV > regulator->max_uV)
211 *max_uV = regulator->max_uV;
212 if (*min_uV < regulator->min_uV)
213 *min_uV = regulator->min_uV;
214 }
215
dd8004af 216 if (*min_uV > *max_uV) {
9c7b4e8a
RD		 217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
218 *min_uV, *max_uV);
05fda3b1 219 return -EINVAL;
dd8004af 220 }
05fda3b1
TP		 221
222 return 0;
223}
224
414c70cb
LG		 225/* current constraint check */
226static int regulator_check_current_limit(struct regulator_dev *rdev,
227 int *min_uA, int *max_uA)
228{
229 BUG_ON(*min_uA > *max_uA);
230
231 if (!rdev->constraints) {
5da84fd9 232 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 233 return -ENODEV;
234 }
235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
5da84fd9 236 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 237 return -EPERM;
238 }
239
240 if (*max_uA > rdev->constraints->max_uA)
241 *max_uA = rdev->constraints->max_uA;
242 if (*min_uA < rdev->constraints->min_uA)
243 *min_uA = rdev->constraints->min_uA;
244
89f425ed
MB		 245 if (*min_uA > *max_uA) {
246 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 247 *min_uA, *max_uA);
414c70cb 248 return -EINVAL;
89f425ed 249 }
414c70cb
LG		 250
251 return 0;
252}
253
254/* operating mode constraint check */
2c608234 255static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 256{
2c608234 257 switch (*mode) {
e573520b
DB		 258 case REGULATOR_MODE_FAST:
259 case REGULATOR_MODE_NORMAL:
260 case REGULATOR_MODE_IDLE:
261 case REGULATOR_MODE_STANDBY:
262 break;
263 default:
89f425ed 264 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 265 return -EINVAL;
266 }
267
414c70cb 268 if (!rdev->constraints) {
5da84fd9 269 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 270 return -ENODEV;
271 }
272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
5da84fd9 273 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 274 return -EPERM;
275 }
2c608234
MB		 276
277 /* The modes are bitmasks, the most power hungry modes having
278 * the lowest values. If the requested mode isn't supported
279 * try higher modes. */
280 while (*mode) {
281 if (rdev->constraints->valid_modes_mask & *mode)
282 return 0;
283 *mode /= 2;
414c70cb 284 }
2c608234
MB		 285
286 return -EINVAL;
414c70cb
LG		 287}
288
289/* dynamic regulator mode switching constraint check */
290static int regulator_check_drms(struct regulator_dev *rdev)
291{
292 if (!rdev->constraints) {
5da84fd9 293 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 294 return -ENODEV;
295 }
296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
5da84fd9 297 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 298 return -EPERM;
299 }
300 return 0;
301}
302
414c70cb
LG		 303static ssize_t regulator_uV_show(struct device *dev,
304 struct device_attribute *attr, char *buf)
305{
a5766f11 306 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 307 ssize_t ret;
308
309 mutex_lock(&rdev->mutex);
310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
311 mutex_unlock(&rdev->mutex);
312
313 return ret;
314}
7ad68e2f 315static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 316
317static ssize_t regulator_uA_show(struct device *dev,
318 struct device_attribute *attr, char *buf)
319{
a5766f11 320 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 321
322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
323}
7ad68e2f 324static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 325
bc558a60
MB		 326static ssize_t regulator_name_show(struct device *dev,
327 struct device_attribute *attr, char *buf)
328{
329 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 330
1083c393 331 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60
MB		 332}
333
4fca9545 334static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 335{
414c70cb
LG		 336 switch (mode) {
337 case REGULATOR_MODE_FAST:
338 return sprintf(buf, "fast\n");
339 case REGULATOR_MODE_NORMAL:
340 return sprintf(buf, "normal\n");
341 case REGULATOR_MODE_IDLE:
342 return sprintf(buf, "idle\n");
343 case REGULATOR_MODE_STANDBY:
344 return sprintf(buf, "standby\n");
345 }
346 return sprintf(buf, "unknown\n");
347}
348
4fca9545
DB		 349static ssize_t regulator_opmode_show(struct device *dev,
350 struct device_attribute *attr, char *buf)
414c70cb 351{
a5766f11 352 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 353
4fca9545
DB		 354 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
355}
7ad68e2f 356static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 357
358static ssize_t regulator_print_state(char *buf, int state)
359{
414c70cb
LG		 360 if (state > 0)
361 return sprintf(buf, "enabled\n");
362 else if (state == 0)
363 return sprintf(buf, "disabled\n");
364 else
365 return sprintf(buf, "unknown\n");
366}
367
4fca9545
DB		 368static ssize_t regulator_state_show(struct device *dev,
369 struct device_attribute *attr, char *buf)
370{
371 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 372 ssize_t ret;
373
374 mutex_lock(&rdev->mutex);
375 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
376 mutex_unlock(&rdev->mutex);
4fca9545 377
9332546f 378 return ret;
4fca9545 379}
7ad68e2f 380static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 381
853116a1
DB		 382static ssize_t regulator_status_show(struct device *dev,
383 struct device_attribute *attr, char *buf)
384{
385 struct regulator_dev *rdev = dev_get_drvdata(dev);
386 int status;
387 char *label;
388
389 status = rdev->desc->ops->get_status(rdev);
390 if (status < 0)
391 return status;
392
393 switch (status) {
394 case REGULATOR_STATUS_OFF:
395 label = "off";
396 break;
397 case REGULATOR_STATUS_ON:
398 label = "on";
399 break;
400 case REGULATOR_STATUS_ERROR:
401 label = "error";
402 break;
403 case REGULATOR_STATUS_FAST:
404 label = "fast";
405 break;
406 case REGULATOR_STATUS_NORMAL:
407 label = "normal";
408 break;
409 case REGULATOR_STATUS_IDLE:
410 label = "idle";
411 break;
412 case REGULATOR_STATUS_STANDBY:
413 label = "standby";
414 break;
f59c8f9f
MB		 415 case REGULATOR_STATUS_BYPASS:
416 label = "bypass";
417 break;
1beaf762
KG		 418 case REGULATOR_STATUS_UNDEFINED:
419 label = "undefined";
420 break;
853116a1
DB		 421 default:
422 return -ERANGE;
423 }
424
425 return sprintf(buf, "%s\n", label);
426}
427static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
428
414c70cb
LG		 429static ssize_t regulator_min_uA_show(struct device *dev,
430 struct device_attribute *attr, char *buf)
431{
a5766f11 432 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 433
434 if (!rdev->constraints)
435 return sprintf(buf, "constraint not defined\n");
436
437 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
438}
7ad68e2f 439static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 440
441static ssize_t regulator_max_uA_show(struct device *dev,
442 struct device_attribute *attr, char *buf)
443{
a5766f11 444 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 445
446 if (!rdev->constraints)
447 return sprintf(buf, "constraint not defined\n");
448
449 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
450}
7ad68e2f 451static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 452
453static ssize_t regulator_min_uV_show(struct device *dev,
454 struct device_attribute *attr, char *buf)
455{
a5766f11 456 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 457
458 if (!rdev->constraints)
459 return sprintf(buf, "constraint not defined\n");
460
461 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
462}
7ad68e2f 463static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 464
465static ssize_t regulator_max_uV_show(struct device *dev,
466 struct device_attribute *attr, char *buf)
467{
a5766f11 468 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 469
470 if (!rdev->constraints)
471 return sprintf(buf, "constraint not defined\n");
472
473 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
474}
7ad68e2f 475static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 476
477static ssize_t regulator_total_uA_show(struct device *dev,
478 struct device_attribute *attr, char *buf)
479{
a5766f11 480 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 481 struct regulator *regulator;
482 int uA = 0;
483
484 mutex_lock(&rdev->mutex);
485 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 486 uA += regulator->uA_load;
414c70cb
LG		 487 mutex_unlock(&rdev->mutex);
488 return sprintf(buf, "%d\n", uA);
489}
7ad68e2f 490static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb
LG		 491
492static ssize_t regulator_num_users_show(struct device *dev,
493 struct device_attribute *attr, char *buf)
494{
a5766f11 495 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 496 return sprintf(buf, "%d\n", rdev->use_count);
497}
498
499static ssize_t regulator_type_show(struct device *dev,
500 struct device_attribute *attr, char *buf)
501{
a5766f11 502 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 503
504 switch (rdev->desc->type) {
505 case REGULATOR_VOLTAGE:
506 return sprintf(buf, "voltage\n");
507 case REGULATOR_CURRENT:
508 return sprintf(buf, "current\n");
509 }
510 return sprintf(buf, "unknown\n");
511}
512
513static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
514 struct device_attribute *attr, char *buf)
515{
a5766f11 516 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 517
414c70cb
LG		 518 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
519}
7ad68e2f
DB		 520static DEVICE_ATTR(suspend_mem_microvolts, 0444,
521 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 522
523static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
524 struct device_attribute *attr, char *buf)
525{
a5766f11 526 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 527
414c70cb
LG		 528 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
529}
7ad68e2f
DB		 530static DEVICE_ATTR(suspend_disk_microvolts, 0444,
531 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 532
533static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
534 struct device_attribute *attr, char *buf)
535{
a5766f11 536 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 537
414c70cb
LG		 538 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
539}
7ad68e2f
DB		 540static DEVICE_ATTR(suspend_standby_microvolts, 0444,
541 regulator_suspend_standby_uV_show, NULL);
414c70cb 542
414c70cb
LG		 543static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
544 struct device_attribute *attr, char *buf)
545{
a5766f11 546 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 547
4fca9545
DB		 548 return regulator_print_opmode(buf,
549 rdev->constraints->state_mem.mode);
414c70cb 550}
7ad68e2f
DB		 551static DEVICE_ATTR(suspend_mem_mode, 0444,
552 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 553
554static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
555 struct device_attribute *attr, char *buf)
556{
a5766f11 557 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 558
4fca9545
DB		 559 return regulator_print_opmode(buf,
560 rdev->constraints->state_disk.mode);
414c70cb 561}
7ad68e2f
DB		 562static DEVICE_ATTR(suspend_disk_mode, 0444,
563 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 564
565static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
566 struct device_attribute *attr, char *buf)
567{
a5766f11 568 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 569
4fca9545
DB		 570 return regulator_print_opmode(buf,
571 rdev->constraints->state_standby.mode);
414c70cb 572}
7ad68e2f
DB		 573static DEVICE_ATTR(suspend_standby_mode, 0444,
574 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 575
576static ssize_t regulator_suspend_mem_state_show(struct device *dev,
577 struct device_attribute *attr, char *buf)
578{
a5766f11 579 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 580
4fca9545
DB		 581 return regulator_print_state(buf,
582 rdev->constraints->state_mem.enabled);
414c70cb 583}
7ad68e2f
DB		 584static DEVICE_ATTR(suspend_mem_state, 0444,
585 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 586
587static ssize_t regulator_suspend_disk_state_show(struct device *dev,
588 struct device_attribute *attr, char *buf)
589{
a5766f11 590 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 591
4fca9545
DB		 592 return regulator_print_state(buf,
593 rdev->constraints->state_disk.enabled);
414c70cb 594}
7ad68e2f
DB		 595static DEVICE_ATTR(suspend_disk_state, 0444,
596 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 597
598static ssize_t regulator_suspend_standby_state_show(struct device *dev,
599 struct device_attribute *attr, char *buf)
600{
a5766f11 601 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 602
4fca9545
DB		 603 return regulator_print_state(buf,
604 rdev->constraints->state_standby.enabled);
414c70cb 605}
7ad68e2f
DB		 606static DEVICE_ATTR(suspend_standby_state, 0444,
607 regulator_suspend_standby_state_show, NULL);
608
f59c8f9f
MB		 609static ssize_t regulator_bypass_show(struct device *dev,
610 struct device_attribute *attr, char *buf)
611{
612 struct regulator_dev *rdev = dev_get_drvdata(dev);
613 const char *report;
614 bool bypass;
615 int ret;
616
617 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
618
619 if (ret != 0)
620 report = "unknown";
621 else if (bypass)
622 report = "enabled";
623 else
624 report = "disabled";
625
626 return sprintf(buf, "%s\n", report);
627}
628static DEVICE_ATTR(bypass, 0444,
629 regulator_bypass_show, NULL);
bc558a60 630
7ad68e2f
DB		 631/*
632 * These are the only attributes are present for all regulators.
633 * Other attributes are a function of regulator functionality.
634 */
414c70cb 635static struct device_attribute regulator_dev_attrs[] = {
bc558a60 636 __ATTR(name, 0444, regulator_name_show, NULL),
414c70cb
LG		 637 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
638 __ATTR(type, 0444, regulator_type_show, NULL),
414c70cb
LG		 639 __ATTR_NULL,
640};
641
642static void regulator_dev_release(struct device *dev)
643{
a5766f11 644 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 645 kfree(rdev);
646}
647
648static struct class regulator_class = {
649 .name = "regulator",
650 .dev_release = regulator_dev_release,
651 .dev_attrs = regulator_dev_attrs,
652};
653
654/* Calculate the new optimum regulator operating mode based on the new total
655 * consumer load. All locks held by caller */
656static void drms_uA_update(struct regulator_dev *rdev)
657{
658 struct regulator *sibling;
659 int current_uA = 0, output_uV, input_uV, err;
660 unsigned int mode;
661
662 err = regulator_check_drms(rdev);
663 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
476c2d83
MB		 664 (!rdev->desc->ops->get_voltage &&
665 !rdev->desc->ops->get_voltage_sel) ||
666 !rdev->desc->ops->set_mode)
036de8ef 667 return;
414c70cb
LG		 668
669 /* get output voltage */
1bf5a1f8 670 output_uV = _regulator_get_voltage(rdev);
414c70cb
LG		 671 if (output_uV <= 0)
672 return;
673
674 /* get input voltage */
1bf5a1f8
MB		 675 input_uV = 0;
676 if (rdev->supply)
3f24f5ad 677 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 678 if (input_uV <= 0)
414c70cb
LG		 679 input_uV = rdev->constraints->input_uV;
680 if (input_uV <= 0)
681 return;
682
683 /* calc total requested load */
684 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 685 current_uA += sibling->uA_load;
414c70cb
LG		 686
687 /* now get the optimum mode for our new total regulator load */
688 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
689 output_uV, current_uA);
690
691 /* check the new mode is allowed */
2c608234 692 err = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 693 if (err == 0)
694 rdev->desc->ops->set_mode(rdev, mode);
695}
696
697static int suspend_set_state(struct regulator_dev *rdev,
698 struct regulator_state *rstate)
699{
700 int ret = 0;
638f85c5
MB		 701
702 /* If we have no suspend mode configration don't set anything;
8ac0e95d
AL		 703 * only warn if the driver implements set_suspend_voltage or
704 * set_suspend_mode callback.
638f85c5
MB		 705 */
706 if (!rstate->enabled && !rstate->disabled) {
8ac0e95d
AL		 707 if (rdev->desc->ops->set_suspend_voltage ||
708 rdev->desc->ops->set_suspend_mode)
5da84fd9 709 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 710 return 0;
711 }
712
713 if (rstate->enabled && rstate->disabled) {
5da84fd9 714 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 715 return -EINVAL;
716 }
414c70cb 717
8ac0e95d 718 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
414c70cb 719 ret = rdev->desc->ops->set_suspend_enable(rdev);
8ac0e95d 720 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
414c70cb 721 ret = rdev->desc->ops->set_suspend_disable(rdev);
8ac0e95d
AL		 722 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
723 ret = 0;
724
414c70cb 725 if (ret < 0) {
5da84fd9 726 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 727 return ret;
728 }
729
730 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
731 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
732 if (ret < 0) {
5da84fd9 733 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 734 return ret;
735 }
736 }
737
738 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
739 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
740 if (ret < 0) {
5da84fd9 741 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 742 return ret;
743 }
744 }
745 return ret;
746}
747
748/* locks held by caller */
749static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
750{
751 if (!rdev->constraints)
752 return -EINVAL;
753
754 switch (state) {
755 case PM_SUSPEND_STANDBY:
756 return suspend_set_state(rdev,
757 &rdev->constraints->state_standby);
758 case PM_SUSPEND_MEM:
759 return suspend_set_state(rdev,
760 &rdev->constraints->state_mem);
761 case PM_SUSPEND_MAX:
762 return suspend_set_state(rdev,
763 &rdev->constraints->state_disk);
764 default:
765 return -EINVAL;
766 }
767}
768
769static void print_constraints(struct regulator_dev *rdev)
770{
771 struct regulation_constraints *constraints = rdev->constraints;
973e9a27 772 char buf[80] = "";
8f031b48
MB		 773 int count = 0;
774 int ret;
414c70cb 775
8f031b48 776 if (constraints->min_uV && constraints->max_uV) {
414c70cb 777 if (constraints->min_uV == constraints->max_uV)
8f031b48
MB		 778 count += sprintf(buf + count, "%d mV ",
779 constraints->min_uV / 1000);
414c70cb 780 else
8f031b48
MB		 781 count += sprintf(buf + count, "%d <--> %d mV ",
782 constraints->min_uV / 1000,
783 constraints->max_uV / 1000);
784 }
785
786 if (!constraints->min_uV ||
787 constraints->min_uV != constraints->max_uV) {
788 ret = _regulator_get_voltage(rdev);
789 if (ret > 0)
790 count += sprintf(buf + count, "at %d mV ", ret / 1000);
791 }
792
bf5892a8
MB		 793 if (constraints->uV_offset)
794 count += sprintf(buf, "%dmV offset ",
795 constraints->uV_offset / 1000);
796
8f031b48 797 if (constraints->min_uA && constraints->max_uA) {
414c70cb 798 if (constraints->min_uA == constraints->max_uA)
8f031b48
MB		 799 count += sprintf(buf + count, "%d mA ",
800 constraints->min_uA / 1000);
414c70cb 801 else
8f031b48
MB		 802 count += sprintf(buf + count, "%d <--> %d mA ",
803 constraints->min_uA / 1000,
804 constraints->max_uA / 1000);
805 }
806
807 if (!constraints->min_uA ||
808 constraints->min_uA != constraints->max_uA) {
809 ret = _regulator_get_current_limit(rdev);
810 if (ret > 0)
e4a6376b 811 count += sprintf(buf + count, "at %d mA ", ret / 1000);
414c70cb 812 }
8f031b48 813
414c70cb
LG		 814 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
815 count += sprintf(buf + count, "fast ");
816 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
817 count += sprintf(buf + count, "normal ");
818 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
819 count += sprintf(buf + count, "idle ");
820 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
821 count += sprintf(buf + count, "standby");
822
215b8b05
UKK		 823 if (!count)
824 sprintf(buf, "no parameters");
825
13ce29f8 826 rdev_info(rdev, "%s\n", buf);
4a682922
MB		 827
828 if ((constraints->min_uV != constraints->max_uV) &&
829 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
830 rdev_warn(rdev,
831 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 832}
833
e79055d6 834static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 835 struct regulation_constraints *constraints)
a5766f11 836{
e5fda26c 837 struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 838 int ret;
839
840 /* do we need to apply the constraint voltage */
841 if (rdev->constraints->apply_uV &&
75790251
MB		 842 rdev->constraints->min_uV == rdev->constraints->max_uV) {
843 ret = _regulator_do_set_voltage(rdev,
844 rdev->constraints->min_uV,
845 rdev->constraints->max_uV);
846 if (ret < 0) {
847 rdev_err(rdev, "failed to apply %duV constraint\n",
848 rdev->constraints->min_uV);
75790251
MB		 849 return ret;
850 }
af5866c9 851 }
e06f5b4f 852
4367cfdc
DB		 853 /* constrain machine-level voltage specs to fit
854 * the actual range supported by this regulator.
855 */
856 if (ops->list_voltage && rdev->desc->n_voltages) {
857 int count = rdev->desc->n_voltages;
858 int i;
859 int min_uV = INT_MAX;
860 int max_uV = INT_MIN;
861 int cmin = constraints->min_uV;
862 int cmax = constraints->max_uV;
863
3e590918
MB		 864 /* it's safe to autoconfigure fixed-voltage supplies
865 and the constraints are used by list_voltage. */
4367cfdc 866 if (count == 1 && !cmin) {
3e590918 867 cmin = 1;
4367cfdc 868 cmax = INT_MAX;
3e590918
MB		 869 constraints->min_uV = cmin;
870 constraints->max_uV = cmax;
4367cfdc
DB		 871 }
872
3e2b9abd
MB		 873 /* voltage constraints are optional */
874 if ((cmin == 0) && (cmax == 0))
e79055d6 875 return 0;
3e2b9abd 876
4367cfdc 877 /* else require explicit machine-level constraints */
3e2b9abd 878 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 879 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 880 return -EINVAL;
4367cfdc
DB		 881 }
882
883 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
884 for (i = 0; i < count; i++) {
885 int value;
886
887 value = ops->list_voltage(rdev, i);
888 if (value <= 0)
889 continue;
890
891 /* maybe adjust [min_uV..max_uV] */
892 if (value >= cmin && value < min_uV)
893 min_uV = value;
894 if (value <= cmax && value > max_uV)
895 max_uV = value;
896 }
897
898 /* final: [min_uV..max_uV] valid iff constraints valid */
899 if (max_uV < min_uV) {
fff15bef
MB		 900 rdev_err(rdev,
901 "unsupportable voltage constraints %u-%uuV\n",
902 min_uV, max_uV);
e79055d6 903 return -EINVAL;
4367cfdc
DB		 904 }
905
906 /* use regulator's subset of machine constraints */
907 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 908 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
909 constraints->min_uV, min_uV);
4367cfdc
DB		 910 constraints->min_uV = min_uV;
911 }
912 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 913 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
914 constraints->max_uV, max_uV);
4367cfdc
DB		 915 constraints->max_uV = max_uV;
916 }
917 }
918
e79055d6
MB		 919 return 0;
920}
921
922/**
923 * set_machine_constraints - sets regulator constraints
924 * @rdev: regulator source
925 * @constraints: constraints to apply
926 *
927 * Allows platform initialisation code to define and constrain
928 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
929 * Constraints *must* be set by platform code in order for some
930 * regulator operations to proceed i.e. set_voltage, set_current_limit,
931 * set_mode.
932 */
933static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 934 const struct regulation_constraints *constraints)
e79055d6
MB		 935{
936 int ret = 0;
e79055d6
MB		 937 struct regulator_ops *ops = rdev->desc->ops;
938
9a8f5e07
MB		 939 if (constraints)
940 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
941 GFP_KERNEL);
942 else
943 rdev->constraints = kzalloc(sizeof(*constraints),
944 GFP_KERNEL);
f8c12fe3
MB		 945 if (!rdev->constraints)
946 return -ENOMEM;
af5866c9 947
f8c12fe3 948 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6
MB		 949 if (ret != 0)
950 goto out;
951
a5766f11 952 /* do we need to setup our suspend state */
9a8f5e07 953 if (rdev->constraints->initial_state) {
f8c12fe3 954 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 955 if (ret < 0) {
5da84fd9 956 rdev_err(rdev, "failed to set suspend state\n");
e06f5b4f
MB		 957 goto out;
958 }
959 }
a5766f11 960
9a8f5e07 961 if (rdev->constraints->initial_mode) {
a308466c 962 if (!ops->set_mode) {
5da84fd9 963 rdev_err(rdev, "no set_mode operation\n");
a308466c
MB		 964 ret = -EINVAL;
965 goto out;
966 }
967
f8c12fe3 968 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 969 if (ret < 0) {
5da84fd9 970 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
a308466c
MB		 971 goto out;
972 }
973 }
974
cacf90f2
MB		 975 /* If the constraints say the regulator should be on at this point
976 * and we have control then make sure it is enabled.
977 */
f8c12fe3
MB		 978 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
979 ops->enable) {
e5fda26c
MB		 980 ret = ops->enable(rdev);
981 if (ret < 0) {
5da84fd9 982 rdev_err(rdev, "failed to enable\n");
e5fda26c
MB		 983 goto out;
984 }
985 }
986
6f0b2c69
YSB		 987 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) {
988 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
989 if (ret < 0) {
990 rdev_err(rdev, "failed to set ramp_delay\n");
991 goto out;
992 }
993 }
994
a5766f11 995 print_constraints(rdev);
1a6958e7 996 return 0;
a5766f11 997out:
1a6958e7
AL		 998 kfree(rdev->constraints);
999 rdev->constraints = NULL;
a5766f11
LG		 1000 return ret;
1001}
1002
1003/**
1004 * set_supply - set regulator supply regulator
69279fb9
MB		 1005 * @rdev: regulator name
1006 * @supply_rdev: supply regulator name
a5766f11
LG		 1007 *
1008 * Called by platform initialisation code to set the supply regulator for this
1009 * regulator. This ensures that a regulators supply will also be enabled by the
1010 * core if it's child is enabled.
1011 */
1012static int set_supply(struct regulator_dev *rdev,
3801b86a 1013 struct regulator_dev *supply_rdev)
a5766f11
LG		 1014{
1015 int err;
1016
3801b86a
MB		 1017 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1018
1019 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 1020 if (rdev->supply == NULL) {
1021 err = -ENOMEM;
3801b86a 1022 return err;
a5766f11 1023 }
57ad526a 1024 supply_rdev->open_count++;
3801b86a
MB		 1025
1026 return 0;
a5766f11
LG		 1027}
1028
1029/**
06c63f93 1030 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 1031 * @rdev: regulator source
40f9244f 1032 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 1033 * @supply: symbolic name for supply
a5766f11
LG		 1034 *
1035 * Allows platform initialisation code to map physical regulator
1036 * sources to symbolic names for supplies for use by devices. Devices
1037 * should use these symbolic names to request regulators, avoiding the
1038 * need to provide board-specific regulator names as platform data.
1039 */
1040static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 1041 const char *consumer_dev_name,
1042 const char *supply)
a5766f11
LG		 1043{
1044 struct regulator_map *node;
9ed2099e 1045 int has_dev;
a5766f11
LG		 1046
1047 if (supply == NULL)
1048 return -EINVAL;
1049
9ed2099e
MB		 1050 if (consumer_dev_name != NULL)
1051 has_dev = 1;
1052 else
1053 has_dev = 0;
1054
6001e13c 1055 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1056 if (node->dev_name && consumer_dev_name) {
1057 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1058 continue;
1059 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1060 continue;
23b5cc2a
JN		 1061 }
1062
6001e13c
DB		 1063 if (strcmp(node->supply, supply) != 0)
1064 continue;
1065
737f360d
MB		 1066 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1067 consumer_dev_name,
1068 dev_name(&node->regulator->dev),
1069 node->regulator->desc->name,
1070 supply,
1071 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 1072 return -EBUSY;
1073 }
1074
9ed2099e 1075 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 1076 if (node == NULL)
1077 return -ENOMEM;
1078
1079 node->regulator = rdev;
a5766f11
LG		 1080 node->supply = supply;
1081
9ed2099e
MB		 1082 if (has_dev) {
1083 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1084 if (node->dev_name == NULL) {
1085 kfree(node);
1086 return -ENOMEM;
1087 }
40f9244f
MB		 1088 }
1089
a5766f11
LG		 1090 list_add(&node->list, &regulator_map_list);
1091 return 0;
1092}
1093
0f1d747b
MR		 1094static void unset_regulator_supplies(struct regulator_dev *rdev)
1095{
1096 struct regulator_map *node, *n;
1097
1098 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1099 if (rdev == node->regulator) {
1100 list_del(&node->list);
40f9244f 1101 kfree(node->dev_name);
0f1d747b 1102 kfree(node);
0f1d747b
MR		 1103 }
1104 }
1105}
1106
f5726ae3 1107#define REG_STR_SIZE 64
414c70cb
LG		 1108
1109static struct regulator *create_regulator(struct regulator_dev *rdev,
1110 struct device *dev,
1111 const char *supply_name)
1112{
1113 struct regulator *regulator;
1114 char buf[REG_STR_SIZE];
1115 int err, size;
1116
1117 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1118 if (regulator == NULL)
1119 return NULL;
1120
1121 mutex_lock(&rdev->mutex);
1122 regulator->rdev = rdev;
1123 list_add(&regulator->list, &rdev->consumer_list);
1124
1125 if (dev) {
e2c98eaf
SG		 1126 regulator->dev = dev;
1127
222cc7b1 1128 /* Add a link to the device sysfs entry */
414c70cb
LG		 1129 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1130 dev->kobj.name, supply_name);
1131 if (size >= REG_STR_SIZE)
222cc7b1 1132 goto overflow_err;
414c70cb
LG		 1133
1134 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1135 if (regulator->supply_name == NULL)
222cc7b1 1136 goto overflow_err;
414c70cb
LG		 1137
1138 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1139 buf);
1140 if (err) {
5da84fd9
JP		 1141 rdev_warn(rdev, "could not add device link %s err %d\n",
1142 dev->kobj.name, err);
222cc7b1 1143 /* non-fatal */
414c70cb 1144 }
5de70519
MB		 1145 } else {
1146 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1147 if (regulator->supply_name == NULL)
222cc7b1 1148 goto overflow_err;
5de70519
MB		 1149 }
1150
5de70519
MB		 1151 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1152 rdev->debugfs);
24751434 1153 if (!regulator->debugfs) {
5de70519 1154 rdev_warn(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1155 } else {
1156 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1157 &regulator->uA_load);
1158 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1159 &regulator->min_uV);
1160 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1161 &regulator->max_uV);
414c70cb 1162 }
5de70519 1163
6492bc1b
MB		 1164 /*
1165 * Check now if the regulator is an always on regulator - if
1166 * it is then we don't need to do nearly so much work for
1167 * enable/disable calls.
1168 */
1169 if (!_regulator_can_change_status(rdev) &&
1170 _regulator_is_enabled(rdev))
1171 regulator->always_on = true;
1172
414c70cb
LG		 1173 mutex_unlock(&rdev->mutex);
1174 return regulator;
414c70cb
LG		 1175overflow_err:
1176 list_del(&regulator->list);
1177 kfree(regulator);
1178 mutex_unlock(&rdev->mutex);
1179 return NULL;
1180}
1181
31aae2be
MB		 1182static int _regulator_get_enable_time(struct regulator_dev *rdev)
1183{
1184 if (!rdev->desc->ops->enable_time)
79511ed3 1185 return rdev->desc->enable_time;
31aae2be
MB		 1186 return rdev->desc->ops->enable_time(rdev);
1187}
1188
69511a45 1189static struct regulator_dev *regulator_dev_lookup(struct device *dev,
6d191a5f
MB		 1190 const char *supply,
1191 int *ret)
69511a45
RN		 1192{
1193 struct regulator_dev *r;
1194 struct device_node *node;
576ca436
MB		 1195 struct regulator_map *map;
1196 const char *devname = NULL;
69511a45
RN		 1197
1198 /* first do a dt based lookup */
1199 if (dev && dev->of_node) {
1200 node = of_get_regulator(dev, supply);
6d191a5f 1201 if (node) {
69511a45
RN		 1202 list_for_each_entry(r, &regulator_list, list)
1203 if (r->dev.parent &&
1204 node == r->dev.of_node)
1205 return r;
6d191a5f
MB		 1206 } else {
1207 /*
1208 * If we couldn't even get the node then it's
1209 * not just that the device didn't register
1210 * yet, there's no node and we'll never
1211 * succeed.
1212 */
1213 *ret = -ENODEV;
1214 }
69511a45
RN		 1215 }
1216
1217 /* if not found, try doing it non-dt way */
576ca436
MB		 1218 if (dev)
1219 devname = dev_name(dev);
1220
69511a45
RN		 1221 list_for_each_entry(r, &regulator_list, list)
1222 if (strcmp(rdev_get_name(r), supply) == 0)
1223 return r;
1224
576ca436
MB		 1225 list_for_each_entry(map, &regulator_map_list, list) {
1226 /* If the mapping has a device set up it must match */
1227 if (map->dev_name &&
1228 (!devname || strcmp(map->dev_name, devname)))
1229 continue;
1230
1231 if (strcmp(map->supply, supply) == 0)
1232 return map->regulator;
1233 }
1234
1235
69511a45
RN		 1236 return NULL;
1237}
1238
5ffbd136
MB		 1239/* Internal regulator request function */
1240static struct regulator *_regulator_get(struct device *dev, const char *id,
1241 int exclusive)
414c70cb
LG		 1242{
1243 struct regulator_dev *rdev;
04bf3011 1244 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
40f9244f 1245 const char *devname = NULL;
1e4b545c 1246 int ret = 0;
414c70cb
LG		 1247
1248 if (id == NULL) {
5da84fd9 1249 pr_err("get() with no identifier\n");
414c70cb
LG		 1250 return regulator;
1251 }
1252
40f9244f
MB		 1253 if (dev)
1254 devname = dev_name(dev);
1255
414c70cb
LG		 1256 mutex_lock(&regulator_list_mutex);
1257
6d191a5f 1258 rdev = regulator_dev_lookup(dev, id, &ret);
69511a45
RN		 1259 if (rdev)
1260 goto found;
1261
1e4b545c
NM		 1262 /*
1263 * If we have return value from dev_lookup fail, we do not expect to
1264 * succeed, so, quit with appropriate error value
1265 */
1266 if (ret) {
1267 regulator = ERR_PTR(ret);
1268 goto out;
1269 }
1270
688fe99a
MB		 1271 if (board_wants_dummy_regulator) {
1272 rdev = dummy_regulator_rdev;
1273 goto found;
1274 }
1275
34abbd68
MB		 1276#ifdef CONFIG_REGULATOR_DUMMY
1277 if (!devname)
1278 devname = "deviceless";
1279
1280 /* If the board didn't flag that it was fully constrained then
1281 * substitute in a dummy regulator so consumers can continue.
1282 */
1283 if (!has_full_constraints) {
5da84fd9
JP		 1284 pr_warn("%s supply %s not found, using dummy regulator\n",
1285 devname, id);
34abbd68
MB		 1286 rdev = dummy_regulator_rdev;
1287 goto found;
1288 }
1289#endif
1290
414c70cb
LG		 1291 mutex_unlock(&regulator_list_mutex);
1292 return regulator;
1293
1294found:
5ffbd136
MB		 1295 if (rdev->exclusive) {
1296 regulator = ERR_PTR(-EPERM);
1297 goto out;
1298 }
1299
1300 if (exclusive && rdev->open_count) {
1301 regulator = ERR_PTR(-EBUSY);
1302 goto out;
1303 }
1304
a5766f11
LG		 1305 if (!try_module_get(rdev->owner))
1306 goto out;
1307
414c70cb
LG		 1308 regulator = create_regulator(rdev, dev, id);
1309 if (regulator == NULL) {
1310 regulator = ERR_PTR(-ENOMEM);
1311 module_put(rdev->owner);
bcda4321 1312 goto out;
414c70cb
LG		 1313 }
1314
5ffbd136
MB		 1315 rdev->open_count++;
1316 if (exclusive) {
1317 rdev->exclusive = 1;
1318
1319 ret = _regulator_is_enabled(rdev);
1320 if (ret > 0)
1321 rdev->use_count = 1;
1322 else
1323 rdev->use_count = 0;
1324 }
1325
a5766f11 1326out:
414c70cb 1327 mutex_unlock(&regulator_list_mutex);
5ffbd136 1328
414c70cb
LG		 1329 return regulator;
1330}
5ffbd136
MB		 1331
1332/**
1333 * regulator_get - lookup and obtain a reference 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.
1339 *
1340 * Use of supply names configured via regulator_set_device_supply() is
1341 * strongly encouraged. It is recommended that the supply name used
1342 * should match the name used for the supply and/or the relevant
1343 * device pins in the datasheet.
1344 */
1345struct regulator *regulator_get(struct device *dev, const char *id)
1346{
1347 return _regulator_get(dev, id, 0);
1348}
414c70cb
LG		 1349EXPORT_SYMBOL_GPL(regulator_get);
1350
070b9079
SB		 1351static void devm_regulator_release(struct device *dev, void *res)
1352{
1353 regulator_put(*(struct regulator **)res);
1354}
1355
1356/**
1357 * devm_regulator_get - Resource managed regulator_get()
1358 * @dev: device for regulator "consumer"
1359 * @id: Supply name or regulator ID.
1360 *
1361 * Managed regulator_get(). Regulators returned from this function are
1362 * automatically regulator_put() on driver detach. See regulator_get() for more
1363 * information.
1364 */
1365struct regulator *devm_regulator_get(struct device *dev, const char *id)
1366{
1367 struct regulator **ptr, *regulator;
1368
1369 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1370 if (!ptr)
1371 return ERR_PTR(-ENOMEM);
1372
1373 regulator = regulator_get(dev, id);
1374 if (!IS_ERR(regulator)) {
1375 *ptr = regulator;
1376 devres_add(dev, ptr);
1377 } else {
1378 devres_free(ptr);
1379 }
1380
1381 return regulator;
1382}
1383EXPORT_SYMBOL_GPL(devm_regulator_get);
1384
5ffbd136
MB		 1385/**
1386 * regulator_get_exclusive - obtain exclusive access to a regulator.
1387 * @dev: device for regulator "consumer"
1388 * @id: Supply name or regulator ID.
1389 *
1390 * Returns a struct regulator corresponding to the regulator producer,
1391 * or IS_ERR() condition containing errno. Other consumers will be
1392 * unable to obtain this reference is held and the use count for the
1393 * regulator will be initialised to reflect the current state of the
1394 * regulator.
1395 *
1396 * This is intended for use by consumers which cannot tolerate shared
1397 * use of the regulator such as those which need to force the
1398 * regulator off for correct operation of the hardware they are
1399 * controlling.
1400 *
1401 * Use of supply names configured via regulator_set_device_supply() is
1402 * strongly encouraged. It is recommended that the supply name used
1403 * should match the name used for the supply and/or the relevant
1404 * device pins in the datasheet.
1405 */
1406struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1407{
1408 return _regulator_get(dev, id, 1);
1409}
1410EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1411
23ff2f0f
CK		 1412/* Locks held by regulator_put() */
1413static void _regulator_put(struct regulator *regulator)
414c70cb
LG		 1414{
1415 struct regulator_dev *rdev;
1416
1417 if (regulator == NULL || IS_ERR(regulator))
1418 return;
1419
414c70cb
LG		 1420 rdev = regulator->rdev;
1421
5de70519 1422 debugfs_remove_recursive(regulator->debugfs);
5de70519 1423
414c70cb 1424 /* remove any sysfs entries */
e2c98eaf 1425 if (regulator->dev)
414c70cb 1426 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
5de70519 1427 kfree(regulator->supply_name);
414c70cb
LG		 1428 list_del(&regulator->list);
1429 kfree(regulator);
1430
5ffbd136
MB		 1431 rdev->open_count--;
1432 rdev->exclusive = 0;
1433
414c70cb 1434 module_put(rdev->owner);
23ff2f0f
CK		 1435}
1436
1437/**
1438 * regulator_put - "free" the regulator source
1439 * @regulator: regulator source
1440 *
1441 * Note: drivers must ensure that all regulator_enable calls made on this
1442 * regulator source are balanced by regulator_disable calls prior to calling
1443 * this function.
1444 */
1445void regulator_put(struct regulator *regulator)
1446{
1447 mutex_lock(&regulator_list_mutex);
1448 _regulator_put(regulator);
414c70cb
LG		 1449 mutex_unlock(&regulator_list_mutex);
1450}
1451EXPORT_SYMBOL_GPL(regulator_put);
1452
d5ad34f7
MB		 1453static int devm_regulator_match(struct device *dev, void *res, void *data)
1454{
1455 struct regulator **r = res;
1456 if (!r || !*r) {
1457 WARN_ON(!r || !*r);
1458 return 0;
1459 }
1460 return *r == data;
1461}
1462
1463/**
1464 * devm_regulator_put - Resource managed regulator_put()
1465 * @regulator: regulator to free
1466 *
1467 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1468 * this function will not need to be called and the resource management
1469 * code will ensure that the resource is freed.
1470 */
1471void devm_regulator_put(struct regulator *regulator)
1472{
1473 int rc;
1474
361ff501 1475 rc = devres_release(regulator->dev, devm_regulator_release,
d5ad34f7 1476 devm_regulator_match, regulator);
230a5a1c 1477 if (rc != 0)
968c2c17 1478 WARN_ON(rc);
d5ad34f7
MB		 1479}
1480EXPORT_SYMBOL_GPL(devm_regulator_put);
1481
f19b00da
KM		 1482/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1483static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1484 const struct regulator_config *config)
1485{
1486 struct regulator_enable_gpio *pin;
1487 int ret;
1488
1489 list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
1490 if (pin->gpio == config->ena_gpio) {
1491 rdev_dbg(rdev, "GPIO %d is already used\n",
1492 config->ena_gpio);
1493 goto update_ena_gpio_to_rdev;
1494 }
1495 }
1496
1497 ret = gpio_request_one(config->ena_gpio,
1498 GPIOF_DIR_OUT | config->ena_gpio_flags,
1499 rdev_get_name(rdev));
1500 if (ret)
1501 return ret;
1502
1503 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1504 if (pin == NULL) {
1505 gpio_free(config->ena_gpio);
1506 return -ENOMEM;
1507 }
1508
1509 pin->gpio = config->ena_gpio;
1510 pin->ena_gpio_invert = config->ena_gpio_invert;
1511 list_add(&pin->list, &regulator_ena_gpio_list);
1512
1513update_ena_gpio_to_rdev:
1514 pin->request_count++;
1515 rdev->ena_pin = pin;
1516 return 0;
1517}
1518
1519static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1520{
1521 struct regulator_enable_gpio *pin, *n;
1522
1523 if (!rdev->ena_pin)
1524 return;
1525
1526 /* Free the GPIO only in case of no use */
1527 list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
1528 if (pin->gpio == rdev->ena_pin->gpio) {
1529 if (pin->request_count <= 1) {
1530 pin->request_count = 0;
1531 gpio_free(pin->gpio);
1532 list_del(&pin->list);
1533 kfree(pin);
1534 } else {
1535 pin->request_count--;
1536 }
1537 }
1538 }
1539}
1540
967cfb18
KM		 1541/**
1542 * Balance enable_count of each GPIO and actual GPIO pin control.
1543 * GPIO is enabled in case of initial use. (enable_count is 0)
1544 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1545 */
1546static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1547{
1548 struct regulator_enable_gpio *pin = rdev->ena_pin;
1549
1550 if (!pin)
1551 return -EINVAL;
1552
1553 if (enable) {
1554 /* Enable GPIO at initial use */
1555 if (pin->enable_count == 0)
1556 gpio_set_value_cansleep(pin->gpio,
1557 !pin->ena_gpio_invert);
1558
1559 pin->enable_count++;
1560 } else {
1561 if (pin->enable_count > 1) {
1562 pin->enable_count--;
1563 return 0;
1564 }
1565
1566 /* Disable GPIO if not used */
1567 if (pin->enable_count <= 1) {
1568 gpio_set_value_cansleep(pin->gpio,
1569 pin->ena_gpio_invert);
1570 pin->enable_count = 0;
1571 }
1572 }
1573
1574 return 0;
1575}
1576
5c5659d0
MB		 1577static int _regulator_do_enable(struct regulator_dev *rdev)
1578{
1579 int ret, delay;
1580
1581 /* Query before enabling in case configuration dependent. */
1582 ret = _regulator_get_enable_time(rdev);
1583 if (ret >= 0) {
1584 delay = ret;
1585 } else {
1586 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1587 delay = 0;
1588 }
1589
1590 trace_regulator_enable(rdev_get_name(rdev));
1591
967cfb18
KM		 1592 if (rdev->ena_pin) {
1593 ret = regulator_ena_gpio_ctrl(rdev, true);
1594 if (ret < 0)
1595 return ret;
65f73508
MB		 1596 rdev->ena_gpio_state = 1;
1597 } else if (rdev->desc->ops->enable) {
5c5659d0
MB		 1598 ret = rdev->desc->ops->enable(rdev);
1599 if (ret < 0)
1600 return ret;
1601 } else {
1602 return -EINVAL;
1603 }
1604
1605 /* Allow the regulator to ramp; it would be useful to extend
1606 * this for bulk operations so that the regulators can ramp
1607 * together. */
1608 trace_regulator_enable_delay(rdev_get_name(rdev));
1609
1610 if (delay >= 1000) {
1611 mdelay(delay / 1000);
1612 udelay(delay % 1000);
1613 } else if (delay) {
1614 udelay(delay);
1615 }
1616
1617 trace_regulator_enable_complete(rdev_get_name(rdev));
1618
1619 return 0;
1620}
1621
414c70cb
LG		 1622/* locks held by regulator_enable() */
1623static int _regulator_enable(struct regulator_dev *rdev)
1624{
5c5659d0 1625 int ret;
414c70cb 1626
414c70cb 1627 /* check voltage and requested load before enabling */
9a2372fa
MB		 1628 if (rdev->constraints &&
1629 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1630 drms_uA_update(rdev);
414c70cb 1631
9a2372fa
MB		 1632 if (rdev->use_count == 0) {
1633 /* The regulator may on if it's not switchable or left on */
1634 ret = _regulator_is_enabled(rdev);
1635 if (ret == -EINVAL || ret == 0) {
1636 if (!_regulator_can_change_status(rdev))
1637 return -EPERM;
1638
5c5659d0 1639 ret = _regulator_do_enable(rdev);
31aae2be
MB		 1640 if (ret < 0)
1641 return ret;
1642
a7433cff 1643 } else if (ret < 0) {
5da84fd9 1644 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 1645 return ret;
1646 }
a7433cff 1647 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 1648 }
1649
9a2372fa
MB		 1650 rdev->use_count++;
1651
1652 return 0;
414c70cb
LG		 1653}
1654
1655/**
1656 * regulator_enable - enable regulator output
1657 * @regulator: regulator source
1658 *
cf7bbcdf
MB		 1659 * Request that the regulator be enabled with the regulator output at
1660 * the predefined voltage or current value. Calls to regulator_enable()
1661 * must be balanced with calls to regulator_disable().
1662 *
414c70cb 1663 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 1664 * hardwired in the regulator.
414c70cb
LG		 1665 */
1666int regulator_enable(struct regulator *regulator)
1667{
412aec61
DB		 1668 struct regulator_dev *rdev = regulator->rdev;
1669 int ret = 0;
414c70cb 1670
6492bc1b
MB		 1671 if (regulator->always_on)
1672 return 0;
1673
3801b86a
MB		 1674 if (rdev->supply) {
1675 ret = regulator_enable(rdev->supply);
1676 if (ret != 0)
1677 return ret;
1678 }
1679
412aec61 1680 mutex_lock(&rdev->mutex);
cd94b505 1681 ret = _regulator_enable(rdev);
412aec61 1682 mutex_unlock(&rdev->mutex);
3801b86a 1683
d1685e4e 1684 if (ret != 0 && rdev->supply)
3801b86a
MB		 1685 regulator_disable(rdev->supply);
1686
414c70cb
LG		 1687 return ret;
1688}
1689EXPORT_SYMBOL_GPL(regulator_enable);
1690
5c5659d0
MB		 1691static int _regulator_do_disable(struct regulator_dev *rdev)
1692{
1693 int ret;
1694
1695 trace_regulator_disable(rdev_get_name(rdev));
1696
967cfb18
KM		 1697 if (rdev->ena_pin) {
1698 ret = regulator_ena_gpio_ctrl(rdev, false);
1699 if (ret < 0)
1700 return ret;
5c5659d0
MB		 1701 rdev->ena_gpio_state = 0;
1702
1703 } else if (rdev->desc->ops->disable) {
1704 ret = rdev->desc->ops->disable(rdev);
1705 if (ret != 0)
1706 return ret;
1707 }
1708
1709 trace_regulator_disable_complete(rdev_get_name(rdev));
1710
1711 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1712 NULL);
1713 return 0;
1714}
1715
414c70cb 1716/* locks held by regulator_disable() */
3801b86a 1717static int _regulator_disable(struct regulator_dev *rdev)
414c70cb
LG		 1718{
1719 int ret = 0;
1720
cd94b505 1721 if (WARN(rdev->use_count <= 0,
43e7ee33 1722 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 1723 return -EIO;
1724
414c70cb 1725 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 1726 if (rdev->use_count == 1 &&
1727 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 1728
1729 /* we are last user */
5c5659d0
MB		 1730 if (_regulator_can_change_status(rdev)) {
1731 ret = _regulator_do_disable(rdev);
414c70cb 1732 if (ret < 0) {
5da84fd9 1733 rdev_err(rdev, "failed to disable\n");
414c70cb
LG		 1734 return ret;
1735 }
1736 }
1737
414c70cb
LG		 1738 rdev->use_count = 0;
1739 } else if (rdev->use_count > 1) {
1740
1741 if (rdev->constraints &&
1742 (rdev->constraints->valid_ops_mask &
1743 REGULATOR_CHANGE_DRMS))
1744 drms_uA_update(rdev);
1745
1746 rdev->use_count--;
1747 }
3801b86a 1748
414c70cb
LG		 1749 return ret;
1750}
1751
1752/**
1753 * regulator_disable - disable regulator output
1754 * @regulator: regulator source
1755 *
cf7bbcdf
MB		 1756 * Disable the regulator output voltage or current. Calls to
1757 * regulator_enable() must be balanced with calls to
1758 * regulator_disable().
69279fb9 1759 *
414c70cb 1760 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 1761 * devices have it enabled, the regulator device supports disabling and
1762 * machine constraints permit this operation.
414c70cb
LG		 1763 */
1764int regulator_disable(struct regulator *regulator)
1765{
412aec61
DB		 1766 struct regulator_dev *rdev = regulator->rdev;
1767 int ret = 0;
414c70cb 1768
6492bc1b
MB		 1769 if (regulator->always_on)
1770 return 0;
1771
412aec61 1772 mutex_lock(&rdev->mutex);
3801b86a 1773 ret = _regulator_disable(rdev);
412aec61 1774 mutex_unlock(&rdev->mutex);
8cbf811d 1775
3801b86a
MB		 1776 if (ret == 0 && rdev->supply)
1777 regulator_disable(rdev->supply);
8cbf811d 1778
414c70cb
LG		 1779 return ret;
1780}
1781EXPORT_SYMBOL_GPL(regulator_disable);
1782
1783/* locks held by regulator_force_disable() */
3801b86a 1784static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 1785{
1786 int ret = 0;
1787
1788 /* force disable */
1789 if (rdev->desc->ops->disable) {
1790 /* ah well, who wants to live forever... */
1791 ret = rdev->desc->ops->disable(rdev);
1792 if (ret < 0) {
5da84fd9 1793 rdev_err(rdev, "failed to force disable\n");
414c70cb
LG		 1794 return ret;
1795 }
1796 /* notify other consumers that power has been forced off */
84b68263
MB		 1797 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1798 REGULATOR_EVENT_DISABLE, NULL);
414c70cb
LG		 1799 }
1800
414c70cb
LG		 1801 return ret;
1802}
1803
1804/**
1805 * regulator_force_disable - force disable regulator output
1806 * @regulator: regulator source
1807 *
1808 * Forcibly disable the regulator output voltage or current.
1809 * NOTE: this *will* disable the regulator output even if other consumer
1810 * devices have it enabled. This should be used for situations when device
1811 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1812 */
1813int regulator_force_disable(struct regulator *regulator)
1814{
82d15839 1815 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 1816 int ret;
1817
82d15839 1818 mutex_lock(&rdev->mutex);
414c70cb 1819 regulator->uA_load = 0;
3801b86a 1820 ret = _regulator_force_disable(regulator->rdev);
82d15839 1821 mutex_unlock(&rdev->mutex);
8cbf811d 1822
3801b86a
MB		 1823 if (rdev->supply)
1824 while (rdev->open_count--)
1825 regulator_disable(rdev->supply);
8cbf811d 1826
414c70cb
LG		 1827 return ret;
1828}
1829EXPORT_SYMBOL_GPL(regulator_force_disable);
1830
da07ecd9
MB		 1831static void regulator_disable_work(struct work_struct *work)
1832{
1833 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1834 disable_work.work);
1835 int count, i, ret;
1836
1837 mutex_lock(&rdev->mutex);
1838
1839 BUG_ON(!rdev->deferred_disables);
1840
1841 count = rdev->deferred_disables;
1842 rdev->deferred_disables = 0;
1843
1844 for (i = 0; i < count; i++) {
1845 ret = _regulator_disable(rdev);
1846 if (ret != 0)
1847 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1848 }
1849
1850 mutex_unlock(&rdev->mutex);
1851
1852 if (rdev->supply) {
1853 for (i = 0; i < count; i++) {
1854 ret = regulator_disable(rdev->supply);
1855 if (ret != 0) {
1856 rdev_err(rdev,
1857 "Supply disable failed: %d\n", ret);
1858 }
1859 }
1860 }
1861}
1862
1863/**
1864 * regulator_disable_deferred - disable regulator output with delay
1865 * @regulator: regulator source
1866 * @ms: miliseconds until the regulator is disabled
1867 *
1868 * Execute regulator_disable() on the regulator after a delay. This
1869 * is intended for use with devices that require some time to quiesce.
1870 *
1871 * NOTE: this will only disable the regulator output if no other consumer
1872 * devices have it enabled, the regulator device supports disabling and
1873 * machine constraints permit this operation.
1874 */
1875int regulator_disable_deferred(struct regulator *regulator, int ms)
1876{
1877 struct regulator_dev *rdev = regulator->rdev;
aa59802d 1878 int ret;
da07ecd9 1879
6492bc1b
MB		 1880 if (regulator->always_on)
1881 return 0;
1882
2b5a24a0
MB		 1883 if (!ms)
1884 return regulator_disable(regulator);
1885
da07ecd9
MB		 1886 mutex_lock(&rdev->mutex);
1887 rdev->deferred_disables++;
1888 mutex_unlock(&rdev->mutex);
1889
aa59802d
MB		 1890 ret = schedule_delayed_work(&rdev->disable_work,
1891 msecs_to_jiffies(ms));
1892 if (ret < 0)
1893 return ret;
1894 else
1895 return 0;
da07ecd9
MB		 1896}
1897EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1898
cd6dffb4
MB		 1899/**
1900 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1901 *
1902 * @rdev: regulator to operate on
1903 *
1904 * Regulators that use regmap for their register I/O can set the
1905 * enable_reg and enable_mask fields in their descriptor and then use
1906 * this as their is_enabled operation, saving some code.
1907 */
1908int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1909{
1910 unsigned int val;
1911 int ret;
1912
1913 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1914 if (ret != 0)
1915 return ret;
1916
51dcdafc
AL		 1917 if (rdev->desc->enable_is_inverted)
1918 return (val & rdev->desc->enable_mask) == 0;
1919 else
1920 return (val & rdev->desc->enable_mask) != 0;
cd6dffb4
MB		 1921}
1922EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1923
1924/**
1925 * regulator_enable_regmap - standard enable() for regmap users
1926 *
1927 * @rdev: regulator to operate on
1928 *
1929 * Regulators that use regmap for their register I/O can set the
1930 * enable_reg and enable_mask fields in their descriptor and then use
1931 * this as their enable() operation, saving some code.
1932 */
1933int regulator_enable_regmap(struct regulator_dev *rdev)
1934{
51dcdafc
AL		 1935 unsigned int val;
1936
1937 if (rdev->desc->enable_is_inverted)
1938 val = 0;
1939 else
1940 val = rdev->desc->enable_mask;
1941
cd6dffb4 1942 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
51dcdafc 1943 rdev->desc->enable_mask, val);
cd6dffb4
MB		 1944}
1945EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1946
1947/**
1948 * regulator_disable_regmap - standard disable() for regmap users
1949 *
1950 * @rdev: regulator to operate on
1951 *
1952 * Regulators that use regmap for their register I/O can set the
1953 * enable_reg and enable_mask fields in their descriptor and then use
1954 * this as their disable() operation, saving some code.
1955 */
1956int regulator_disable_regmap(struct regulator_dev *rdev)
1957{
51dcdafc
AL		 1958 unsigned int val;
1959
1960 if (rdev->desc->enable_is_inverted)
1961 val = rdev->desc->enable_mask;
1962 else
1963 val = 0;
1964
cd6dffb4 1965 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
51dcdafc 1966 rdev->desc->enable_mask, val);
cd6dffb4
MB		 1967}
1968EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1969
414c70cb
LG		 1970static int _regulator_is_enabled(struct regulator_dev *rdev)
1971{
65f73508 1972 /* A GPIO control always takes precedence */
7b74d149 1973 if (rdev->ena_pin)
65f73508
MB		 1974 return rdev->ena_gpio_state;
1975
9a7f6a4c 1976 /* If we don't know then assume that the regulator is always on */
9332546f 1977 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 1978 return 1;
414c70cb 1979
9332546f 1980 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 1981}
1982
1983/**
1984 * regulator_is_enabled - is the regulator output enabled
1985 * @regulator: regulator source
1986 *
412aec61
DB		 1987 * Returns positive if the regulator driver backing the source/client
1988 * has requested that the device be enabled, zero if it hasn't, else a
1989 * negative errno code.
1990 *
1991 * Note that the device backing this regulator handle can have multiple
1992 * users, so it might be enabled even if regulator_enable() was never
1993 * called for this particular source.
414c70cb
LG		 1994 */
1995int regulator_is_enabled(struct regulator *regulator)
1996{
9332546f
MB		 1997 int ret;
1998
6492bc1b
MB		 1999 if (regulator->always_on)
2000 return 1;
2001
9332546f
MB		 2002 mutex_lock(&regulator->rdev->mutex);
2003 ret = _regulator_is_enabled(regulator->rdev);
2004 mutex_unlock(&regulator->rdev->mutex);
2005
2006 return ret;
414c70cb
LG		 2007}
2008EXPORT_SYMBOL_GPL(regulator_is_enabled);
2009
d1e7de30
MS		 2010/**
2011 * regulator_can_change_voltage - check if regulator can change voltage
2012 * @regulator: regulator source
2013 *
2014 * Returns positive if the regulator driver backing the source/client
2015 * can change its voltage, false otherwise. Usefull for detecting fixed
2016 * or dummy regulators and disabling voltage change logic in the client
2017 * driver.
2018 */
2019int regulator_can_change_voltage(struct regulator *regulator)
2020{
2021 struct regulator_dev *rdev = regulator->rdev;
2022
2023 if (rdev->constraints &&
19280e40
AL		 2024 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2025 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2026 return 1;
2027
2028 if (rdev->desc->continuous_voltage_range &&
2029 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2030 rdev->constraints->min_uV != rdev->constraints->max_uV)
2031 return 1;
2032 }
d1e7de30
MS		 2033
2034 return 0;
2035}
2036EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2037
4367cfdc
DB		 2038/**
2039 * regulator_count_voltages - count regulator_list_voltage() selectors
2040 * @regulator: regulator source
2041 *
2042 * Returns number of selectors, or negative errno. Selectors are
2043 * numbered starting at zero, and typically correspond to bitfields
2044 * in hardware registers.
2045 */
2046int regulator_count_voltages(struct regulator *regulator)
2047{
2048 struct regulator_dev *rdev = regulator->rdev;
2049
2050 return rdev->desc->n_voltages ? : -EINVAL;
2051}
2052EXPORT_SYMBOL_GPL(regulator_count_voltages);
2053
bca7bbff
MB		 2054/**
2055 * regulator_list_voltage_linear - List voltages with simple calculation
2056 *
2057 * @rdev: Regulator device
2058 * @selector: Selector to convert into a voltage
2059 *
2060 * Regulators with a simple linear mapping between voltages and
2061 * selectors can set min_uV and uV_step in the regulator descriptor
2062 * and then use this function as their list_voltage() operation,
2063 */
2064int regulator_list_voltage_linear(struct regulator_dev *rdev,
2065 unsigned int selector)
2066{
2067 if (selector >= rdev->desc->n_voltages)
2068 return -EINVAL;
33234e79
AL		 2069 if (selector < rdev->desc->linear_min_sel)
2070 return 0;
2071
2072 selector -= rdev->desc->linear_min_sel;
bca7bbff
MB		 2073
2074 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
2075}
2076EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
2077
cffc9592
AL		 2078/**
2079 * regulator_list_voltage_table - List voltages with table based mapping
2080 *
2081 * @rdev: Regulator device
2082 * @selector: Selector to convert into a voltage
2083 *
2084 * Regulators with table based mapping between voltages and
2085 * selectors can set volt_table in the regulator descriptor
2086 * and then use this function as their list_voltage() operation.
2087 */
2088int regulator_list_voltage_table(struct regulator_dev *rdev,
2089 unsigned int selector)
2090{
2091 if (!rdev->desc->volt_table) {
2092 BUG_ON(!rdev->desc->volt_table);
2093 return -EINVAL;
2094 }
2095
2096 if (selector >= rdev->desc->n_voltages)
2097 return -EINVAL;
2098
2099 return rdev->desc->volt_table[selector];
2100}
2101EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
2102
4367cfdc
DB		 2103/**
2104 * regulator_list_voltage - enumerate supported voltages
2105 * @regulator: regulator source
2106 * @selector: identify voltage to list
2107 * Context: can sleep
2108 *
2109 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 2110 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 2111 * negative errno.
2112 */
2113int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2114{
2115 struct regulator_dev *rdev = regulator->rdev;
2116 struct regulator_ops *ops = rdev->desc->ops;
2117 int ret;
2118
2119 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
2120 return -EINVAL;
2121
2122 mutex_lock(&rdev->mutex);
2123 ret = ops->list_voltage(rdev, selector);
2124 mutex_unlock(&rdev->mutex);
2125
2126 if (ret > 0) {
2127 if (ret < rdev->constraints->min_uV)
2128 ret = 0;
2129 else if (ret > rdev->constraints->max_uV)
2130 ret = 0;
2131 }
2132
2133 return ret;
2134}
2135EXPORT_SYMBOL_GPL(regulator_list_voltage);
2136
a7a1ad90
MB		 2137/**
2138 * regulator_is_supported_voltage - check if a voltage range can be supported
2139 *
2140 * @regulator: Regulator to check.
2141 * @min_uV: Minimum required voltage in uV.
2142 * @max_uV: Maximum required voltage in uV.
2143 *
2144 * Returns a boolean or a negative error code.
2145 */
2146int regulator_is_supported_voltage(struct regulator *regulator,
2147 int min_uV, int max_uV)
2148{
c5f3939b 2149 struct regulator_dev *rdev = regulator->rdev;
a7a1ad90
MB		 2150 int i, voltages, ret;
2151
c5f3939b
MB		 2152 /* If we can't change voltage check the current voltage */
2153 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2154 ret = regulator_get_voltage(regulator);
2155 if (ret >= 0)
f0f98b19 2156 return (min_uV <= ret && ret <= max_uV);
c5f3939b
MB		 2157 else
2158 return ret;
2159 }
2160
bd7a2b60
PM		 2161 /* Any voltage within constrains range is fine? */
2162 if (rdev->desc->continuous_voltage_range)
2163 return min_uV >= rdev->constraints->min_uV &&
2164 max_uV <= rdev->constraints->max_uV;
2165
a7a1ad90
MB		 2166 ret = regulator_count_voltages(regulator);
2167 if (ret < 0)
2168 return ret;
2169 voltages = ret;
2170
2171 for (i = 0; i < voltages; i++) {
2172 ret = regulator_list_voltage(regulator, i);
2173
2174 if (ret >= min_uV && ret <= max_uV)
2175 return 1;
2176 }
2177
2178 return 0;
2179}
a398eaa2 2180EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 2181
4ab5b3d9
MB		 2182/**
2183 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2184 *
2185 * @rdev: regulator to operate on
2186 *
2187 * Regulators that use regmap for their register I/O can set the
2188 * vsel_reg and vsel_mask fields in their descriptor and then use this
2189 * as their get_voltage_vsel operation, saving some code.
2190 */
2191int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
2192{
2193 unsigned int val;
2194 int ret;
2195
2196 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
2197 if (ret != 0)
2198 return ret;
2199
2200 val &= rdev->desc->vsel_mask;
2201 val >>= ffs(rdev->desc->vsel_mask) - 1;
2202
2203 return val;
2204}
2205EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
2206
2207/**
2208 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2209 *
2210 * @rdev: regulator to operate on
2211 * @sel: Selector to set
2212 *
2213 * Regulators that use regmap for their register I/O can set the
2214 * vsel_reg and vsel_mask fields in their descriptor and then use this
2215 * as their set_voltage_vsel operation, saving some code.
2216 */
2217int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
2218{
c8520b4c
AL		 2219 int ret;
2220
4ab5b3d9
MB		 2221 sel <<= ffs(rdev->desc->vsel_mask) - 1;
2222
c8520b4c 2223 ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
4ab5b3d9 2224 rdev->desc->vsel_mask, sel);
c8520b4c
AL		 2225 if (ret)
2226 return ret;
2227
2228 if (rdev->desc->apply_bit)
2229 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
2230 rdev->desc->apply_bit,
2231 rdev->desc->apply_bit);
2232 return ret;
4ab5b3d9
MB		 2233}
2234EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
2235
e843fc46
MB		 2236/**
2237 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2238 *
2239 * @rdev: Regulator to operate on
2240 * @min_uV: Lower bound for voltage
2241 * @max_uV: Upper bound for voltage
2242 *
2243 * Drivers implementing set_voltage_sel() and list_voltage() can use
2244 * this as their map_voltage() operation. It will find a suitable
2245 * voltage by calling list_voltage() until it gets something in bounds
2246 * for the requested voltages.
2247 */
2248int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2249 int min_uV, int max_uV)
2250{
2251 int best_val = INT_MAX;
2252 int selector = 0;
2253 int i, ret;
2254
2255 /* Find the smallest voltage that falls within the specified
2256 * range.
2257 */
2258 for (i = 0; i < rdev->desc->n_voltages; i++) {
2259 ret = rdev->desc->ops->list_voltage(rdev, i);
2260 if (ret < 0)
2261 continue;
2262
2263 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2264 best_val = ret;
2265 selector = i;
2266 }
2267 }
2268
2269 if (best_val != INT_MAX)
2270 return selector;
2271 else
2272 return -EINVAL;
2273}
2274EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2275
fcf371ee
AL		 2276/**
2277 * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
2278 *
2279 * @rdev: Regulator to operate on
2280 * @min_uV: Lower bound for voltage
2281 * @max_uV: Upper bound for voltage
2282 *
2283 * Drivers that have ascendant voltage list can use this as their
2284 * map_voltage() operation.
2285 */
2286int regulator_map_voltage_ascend(struct regulator_dev *rdev,
2287 int min_uV, int max_uV)
2288{
2289 int i, ret;
2290
2291 for (i = 0; i < rdev->desc->n_voltages; i++) {
2292 ret = rdev->desc->ops->list_voltage(rdev, i);
2293 if (ret < 0)
2294 continue;
2295
2296 if (ret > max_uV)
2297 break;
2298
2299 if (ret >= min_uV && ret <= max_uV)
2300 return i;
2301 }
2302
2303 return -EINVAL;
2304}
2305EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend);
2306
bca7bbff
MB		 2307/**
2308 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2309 *
2310 * @rdev: Regulator to operate on
2311 * @min_uV: Lower bound for voltage
2312 * @max_uV: Upper bound for voltage
2313 *
2314 * Drivers providing min_uV and uV_step in their regulator_desc can
2315 * use this as their map_voltage() operation.
2316 */
2317int regulator_map_voltage_linear(struct regulator_dev *rdev,
2318 int min_uV, int max_uV)
2319{
2320 int ret, voltage;
2321
5a6881e8
AL		 2322 /* Allow uV_step to be 0 for fixed voltage */
2323 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
2324 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
2325 return 0;
2326 else
2327 return -EINVAL;
2328 }
2329
bca7bbff
MB		 2330 if (!rdev->desc->uV_step) {
2331 BUG_ON(!rdev->desc->uV_step);
2332 return -EINVAL;
2333 }
2334
0bdc81e4
AL		 2335 if (min_uV < rdev->desc->min_uV)
2336 min_uV = rdev->desc->min_uV;
2337
ccfcb1c3 2338 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
bca7bbff
MB		 2339 if (ret < 0)
2340 return ret;
2341
33234e79
AL		 2342 ret += rdev->desc->linear_min_sel;
2343
bca7bbff
MB		 2344 /* Map back into a voltage to verify we're still in bounds */
2345 voltage = rdev->desc->ops->list_voltage(rdev, ret);
2346 if (voltage < min_uV || voltage > max_uV)
2347 return -EINVAL;
2348
2349 return ret;
2350}
2351EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2352
75790251
MB		 2353static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2354 int min_uV, int max_uV)
2355{
2356 int ret;
77af1b26 2357 int delay = 0;
e113d792 2358 int best_val = 0;
75790251 2359 unsigned int selector;
eba41a5e 2360 int old_selector = -1;
75790251
MB		 2361
2362 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2363
bf5892a8
MB		 2364 min_uV += rdev->constraints->uV_offset;
2365 max_uV += rdev->constraints->uV_offset;
2366
eba41a5e
AL		 2367 /*
2368 * If we can't obtain the old selector there is not enough
2369 * info to call set_voltage_time_sel().
2370 */
8b7485ef
AL		 2371 if (_regulator_is_enabled(rdev) &&
2372 rdev->desc->ops->set_voltage_time_sel &&
eba41a5e
AL		 2373 rdev->desc->ops->get_voltage_sel) {
2374 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2375 if (old_selector < 0)
2376 return old_selector;
2377 }
2378
75790251
MB		 2379 if (rdev->desc->ops->set_voltage) {
2380 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2381 &selector);
e113d792
MB		 2382
2383 if (ret >= 0) {
2384 if (rdev->desc->ops->list_voltage)
2385 best_val = rdev->desc->ops->list_voltage(rdev,
2386 selector);
2387 else
2388 best_val = _regulator_get_voltage(rdev);
2389 }
2390
e8eef82b 2391 } else if (rdev->desc->ops->set_voltage_sel) {
9152c36a 2392 if (rdev->desc->ops->map_voltage) {
e843fc46
MB		 2393 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2394 max_uV);
9152c36a
AL		 2395 } else {
2396 if (rdev->desc->ops->list_voltage ==
2397 regulator_list_voltage_linear)
2398 ret = regulator_map_voltage_linear(rdev,
2399 min_uV, max_uV);
2400 else
2401 ret = regulator_map_voltage_iterate(rdev,
2402 min_uV, max_uV);
2403 }
e8eef82b 2404
e843fc46 2405 if (ret >= 0) {
e113d792
MB		 2406 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2407 if (min_uV <= best_val && max_uV >= best_val) {
2408 selector = ret;
c66a566a
AL		 2409 if (old_selector == selector)
2410 ret = 0;
2411 else
2412 ret = rdev->desc->ops->set_voltage_sel(
2413 rdev, ret);
e113d792
MB		 2414 } else {
2415 ret = -EINVAL;
2416 }
e8eef82b 2417 }
75790251
MB		 2418 } else {
2419 ret = -EINVAL;
2420 }
e8eef82b 2421
eba41a5e 2422 /* Call set_voltage_time_sel if successfully obtained old_selector */
5aff3a8b 2423 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
c66a566a 2424 old_selector != selector && rdev->desc->ops->set_voltage_time_sel) {
77af1b26 2425
eba41a5e
AL		 2426 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2427 old_selector, selector);
2428 if (delay < 0) {
2429 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2430 delay);
2431 delay = 0;
e8eef82b 2432 }
75790251 2433
8b96de31
PR		 2434 /* Insert any necessary delays */
2435 if (delay >= 1000) {
2436 mdelay(delay / 1000);
2437 udelay(delay % 1000);
2438 } else if (delay) {
2439 udelay(delay);
2440 }
77af1b26
LW		 2441 }
2442
2f6c797f
AL		 2443 if (ret == 0 && best_val >= 0) {
2444 unsigned long data = best_val;
2445
ded06a52 2446 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2f6c797f
AL		 2447 (void *)data);
2448 }
ded06a52 2449
eba41a5e 2450 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
75790251
MB		 2451
2452 return ret;
2453}
2454
414c70cb
LG		 2455/**
2456 * regulator_set_voltage - set regulator output voltage
2457 * @regulator: regulator source
2458 * @min_uV: Minimum required voltage in uV
2459 * @max_uV: Maximum acceptable voltage in uV
2460 *
2461 * Sets a voltage regulator to the desired output voltage. This can be set
2462 * during any regulator state. IOW, regulator can be disabled or enabled.
2463 *
2464 * If the regulator is enabled then the voltage will change to the new value
2465 * immediately otherwise if the regulator is disabled the regulator will
2466 * output at the new voltage when enabled.
2467 *
2468 * NOTE: If the regulator is shared between several devices then the lowest
2469 * request voltage that meets the system constraints will be used.
69279fb9 2470 * Regulator system constraints must be set for this regulator before
414c70cb
LG		 2471 * calling this function otherwise this call will fail.
2472 */
2473int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2474{
2475 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 2476 int ret = 0;
92d7a558 2477 int old_min_uV, old_max_uV;
414c70cb
LG		 2478
2479 mutex_lock(&rdev->mutex);
2480
95a3c23a
MB		 2481 /* If we're setting the same range as last time the change
2482 * should be a noop (some cpufreq implementations use the same
2483 * voltage for multiple frequencies, for example).
2484 */
2485 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2486 goto out;
2487
414c70cb 2488 /* sanity check */
e8eef82b
MB		 2489 if (!rdev->desc->ops->set_voltage &&
2490 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 2491 ret = -EINVAL;
2492 goto out;
2493 }
2494
2495 /* constraints check */
2496 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2497 if (ret < 0)
2498 goto out;
92d7a558
PP		 2499
2500 /* restore original values in case of error */
2501 old_min_uV = regulator->min_uV;
2502 old_max_uV = regulator->max_uV;
414c70cb
LG		 2503 regulator->min_uV = min_uV;
2504 regulator->max_uV = max_uV;
3a93f2a9 2505
05fda3b1
TP		 2506 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2507 if (ret < 0)
92d7a558 2508 goto out2;
05fda3b1 2509
75790251 2510 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
92d7a558
PP		 2511 if (ret < 0)
2512 goto out2;
2513
414c70cb
LG		 2514out:
2515 mutex_unlock(&rdev->mutex);
2516 return ret;
92d7a558
PP		 2517out2:
2518 regulator->min_uV = old_min_uV;
2519 regulator->max_uV = old_max_uV;
2520 mutex_unlock(&rdev->mutex);
414c70cb
LG		 2521 return ret;
2522}
2523EXPORT_SYMBOL_GPL(regulator_set_voltage);
2524
88cd222b
LW		 2525/**
2526 * regulator_set_voltage_time - get raise/fall time
2527 * @regulator: regulator source
2528 * @old_uV: starting voltage in microvolts
2529 * @new_uV: target voltage in microvolts
2530 *
2531 * Provided with the starting and ending voltage, this function attempts to
2532 * calculate the time in microseconds required to rise or fall to this new
2533 * voltage.
2534 */
2535int regulator_set_voltage_time(struct regulator *regulator,
2536 int old_uV, int new_uV)
2537{
2538 struct regulator_dev *rdev = regulator->rdev;
2539 struct regulator_ops *ops = rdev->desc->ops;
2540 int old_sel = -1;
2541 int new_sel = -1;
2542 int voltage;
2543 int i;
2544
2545 /* Currently requires operations to do this */
2546 if (!ops->list_voltage || !ops->set_voltage_time_sel
2547 || !rdev->desc->n_voltages)
2548 return -EINVAL;
2549
2550 for (i = 0; i < rdev->desc->n_voltages; i++) {
2551 /* We only look for exact voltage matches here */
2552 voltage = regulator_list_voltage(regulator, i);
2553 if (voltage < 0)
2554 return -EINVAL;
2555 if (voltage == 0)
2556 continue;
2557 if (voltage == old_uV)
2558 old_sel = i;
2559 if (voltage == new_uV)
2560 new_sel = i;
2561 }
2562
2563 if (old_sel < 0 || new_sel < 0)
2564 return -EINVAL;
2565
2566 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2567}
2568EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2569
98a175b6 2570/**
296c6566
RD		 2571 * regulator_set_voltage_time_sel - get raise/fall time
2572 * @rdev: regulator source device
98a175b6
YSB		 2573 * @old_selector: selector for starting voltage
2574 * @new_selector: selector for target voltage
2575 *
2576 * Provided with the starting and target voltage selectors, this function
2577 * returns time in microseconds required to rise or fall to this new voltage
2578 *
f11d08c3 2579 * Drivers providing ramp_delay in regulation_constraints can use this as their
398715ab 2580 * set_voltage_time_sel() operation.
98a175b6
YSB		 2581 */
2582int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2583 unsigned int old_selector,
2584 unsigned int new_selector)
2585{
398715ab 2586 unsigned int ramp_delay = 0;
f11d08c3 2587 int old_volt, new_volt;
398715ab
AL		 2588
2589 if (rdev->constraints->ramp_delay)
2590 ramp_delay = rdev->constraints->ramp_delay;
2591 else if (rdev->desc->ramp_delay)
2592 ramp_delay = rdev->desc->ramp_delay;
2593
2594 if (ramp_delay == 0) {
6f0b2c69 2595 rdev_warn(rdev, "ramp_delay not set\n");
398715ab 2596 return 0;
6f0b2c69 2597 }
398715ab 2598
f11d08c3
AL		 2599 /* sanity check */
2600 if (!rdev->desc->ops->list_voltage)
2601 return -EINVAL;
398715ab 2602
f11d08c3
AL		 2603 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2604 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2605
2606 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
98a175b6 2607}
b19dbf71 2608EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
98a175b6 2609
606a2562
MB		 2610/**
2611 * regulator_sync_voltage - re-apply last regulator output voltage
2612 * @regulator: regulator source
2613 *
2614 * Re-apply the last configured voltage. This is intended to be used
2615 * where some external control source the consumer is cooperating with
2616 * has caused the configured voltage to change.
2617 */
2618int regulator_sync_voltage(struct regulator *regulator)
2619{
2620 struct regulator_dev *rdev = regulator->rdev;
2621 int ret, min_uV, max_uV;
2622
2623 mutex_lock(&rdev->mutex);
2624
2625 if (!rdev->desc->ops->set_voltage &&
2626 !rdev->desc->ops->set_voltage_sel) {
2627 ret = -EINVAL;
2628 goto out;
2629 }
2630
2631 /* This is only going to work if we've had a voltage configured. */
2632 if (!regulator->min_uV && !regulator->max_uV) {
2633 ret = -EINVAL;
2634 goto out;
2635 }
2636
2637 min_uV = regulator->min_uV;
2638 max_uV = regulator->max_uV;
2639
2640 /* This should be a paranoia check... */
2641 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2642 if (ret < 0)
2643 goto out;
2644
2645 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2646 if (ret < 0)
2647 goto out;
2648
2649 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2650
2651out:
2652 mutex_unlock(&rdev->mutex);
2653 return ret;
2654}
2655EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2656
414c70cb
LG		 2657static int _regulator_get_voltage(struct regulator_dev *rdev)
2658{
bf5892a8 2659 int sel, ret;
476c2d83
MB		 2660
2661 if (rdev->desc->ops->get_voltage_sel) {
2662 sel = rdev->desc->ops->get_voltage_sel(rdev);
2663 if (sel < 0)
2664 return sel;
bf5892a8 2665 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 2666 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 2667 ret = rdev->desc->ops->get_voltage(rdev);
f7df20ec
MB		 2668 } else if (rdev->desc->ops->list_voltage) {
2669 ret = rdev->desc->ops->list_voltage(rdev, 0);
cb220d16 2670 } else {
414c70cb 2671 return -EINVAL;
cb220d16 2672 }
bf5892a8 2673
cb220d16
AL		 2674 if (ret < 0)
2675 return ret;
bf5892a8 2676 return ret - rdev->constraints->uV_offset;
414c70cb
LG		 2677}
2678
2679/**
2680 * regulator_get_voltage - get regulator output voltage
2681 * @regulator: regulator source
2682 *
2683 * This returns the current regulator voltage in uV.
2684 *
2685 * NOTE: If the regulator is disabled it will return the voltage value. This
2686 * function should not be used to determine regulator state.
2687 */
2688int regulator_get_voltage(struct regulator *regulator)
2689{
2690 int ret;
2691
2692 mutex_lock(&regulator->rdev->mutex);
2693
2694 ret = _regulator_get_voltage(regulator->rdev);
2695
2696 mutex_unlock(&regulator->rdev->mutex);
2697
2698 return ret;
2699}
2700EXPORT_SYMBOL_GPL(regulator_get_voltage);
2701
2702/**
2703 * regulator_set_current_limit - set regulator output current limit
2704 * @regulator: regulator source
2705 * @min_uA: Minimuum supported current in uA
2706 * @max_uA: Maximum supported current in uA
2707 *
2708 * Sets current sink to the desired output current. This can be set during
2709 * any regulator state. IOW, regulator can be disabled or enabled.
2710 *
2711 * If the regulator is enabled then the current will change to the new value
2712 * immediately otherwise if the regulator is disabled the regulator will
2713 * output at the new current when enabled.
2714 *
2715 * NOTE: Regulator system constraints must be set for this regulator before
2716 * calling this function otherwise this call will fail.
2717 */
2718int regulator_set_current_limit(struct regulator *regulator,
2719 int min_uA, int max_uA)
2720{
2721 struct regulator_dev *rdev = regulator->rdev;
2722 int ret;
2723
2724 mutex_lock(&rdev->mutex);
2725
2726 /* sanity check */
2727 if (!rdev->desc->ops->set_current_limit) {
2728 ret = -EINVAL;
2729 goto out;
2730 }
2731
2732 /* constraints check */
2733 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2734 if (ret < 0)
2735 goto out;
2736
2737 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2738out:
2739 mutex_unlock(&rdev->mutex);
2740 return ret;
2741}
2742EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2743
2744static int _regulator_get_current_limit(struct regulator_dev *rdev)
2745{
2746 int ret;
2747
2748 mutex_lock(&rdev->mutex);
2749
2750 /* sanity check */
2751 if (!rdev->desc->ops->get_current_limit) {
2752 ret = -EINVAL;
2753 goto out;
2754 }
2755
2756 ret = rdev->desc->ops->get_current_limit(rdev);
2757out:
2758 mutex_unlock(&rdev->mutex);
2759 return ret;
2760}
2761
2762/**
2763 * regulator_get_current_limit - get regulator output current
2764 * @regulator: regulator source
2765 *
2766 * This returns the current supplied by the specified current sink in uA.
2767 *
2768 * NOTE: If the regulator is disabled it will return the current value. This
2769 * function should not be used to determine regulator state.
2770 */
2771int regulator_get_current_limit(struct regulator *regulator)
2772{
2773 return _regulator_get_current_limit(regulator->rdev);
2774}
2775EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2776
2777/**
2778 * regulator_set_mode - set regulator operating mode
2779 * @regulator: regulator source
2780 * @mode: operating mode - one of the REGULATOR_MODE constants
2781 *
2782 * Set regulator operating mode to increase regulator efficiency or improve
2783 * regulation performance.
2784 *
2785 * NOTE: Regulator system constraints must be set for this regulator before
2786 * calling this function otherwise this call will fail.
2787 */
2788int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2789{
2790 struct regulator_dev *rdev = regulator->rdev;
2791 int ret;
500b4ac9 2792 int regulator_curr_mode;
414c70cb
LG		 2793
2794 mutex_lock(&rdev->mutex);
2795
2796 /* sanity check */
2797 if (!rdev->desc->ops->set_mode) {
2798 ret = -EINVAL;
2799 goto out;
2800 }
2801
500b4ac9
SI		 2802 /* return if the same mode is requested */
2803 if (rdev->desc->ops->get_mode) {
2804 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2805 if (regulator_curr_mode == mode) {
2806 ret = 0;
2807 goto out;
2808 }
2809 }
2810
414c70cb 2811 /* constraints check */
22c51b47 2812 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 2813 if (ret < 0)
2814 goto out;
2815
2816 ret = rdev->desc->ops->set_mode(rdev, mode);
2817out:
2818 mutex_unlock(&rdev->mutex);
2819 return ret;
2820}
2821EXPORT_SYMBOL_GPL(regulator_set_mode);
2822
2823static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2824{
2825 int ret;
2826
2827 mutex_lock(&rdev->mutex);
2828
2829 /* sanity check */
2830 if (!rdev->desc->ops->get_mode) {
2831 ret = -EINVAL;
2832 goto out;
2833 }
2834
2835 ret = rdev->desc->ops->get_mode(rdev);
2836out:
2837 mutex_unlock(&rdev->mutex);
2838 return ret;
2839}
2840
2841/**
2842 * regulator_get_mode - get regulator operating mode
2843 * @regulator: regulator source
2844 *
2845 * Get the current regulator operating mode.
2846 */
2847unsigned int regulator_get_mode(struct regulator *regulator)
2848{
2849 return _regulator_get_mode(regulator->rdev);
2850}
2851EXPORT_SYMBOL_GPL(regulator_get_mode);
2852
2853/**
2854 * regulator_set_optimum_mode - set regulator optimum operating mode
2855 * @regulator: regulator source
2856 * @uA_load: load current
2857 *
2858 * Notifies the regulator core of a new device load. This is then used by
2859 * DRMS (if enabled by constraints) to set the most efficient regulator
2860 * operating mode for the new regulator loading.
2861 *
2862 * Consumer devices notify their supply regulator of the maximum power
2863 * they will require (can be taken from device datasheet in the power
2864 * consumption tables) when they change operational status and hence power
2865 * state. Examples of operational state changes that can affect power
2866 * consumption are :-
2867 *
2868 * o Device is opened / closed.
2869 * o Device I/O is about to begin or has just finished.
2870 * o Device is idling in between work.
2871 *
2872 * This information is also exported via sysfs to userspace.
2873 *
2874 * DRMS will sum the total requested load on the regulator and change
2875 * to the most efficient operating mode if platform constraints allow.
2876 *
2877 * Returns the new regulator mode or error.
2878 */
2879int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2880{
2881 struct regulator_dev *rdev = regulator->rdev;
2882 struct regulator *consumer;
d92d95b6 2883 int ret, output_uV, input_uV = 0, total_uA_load = 0;
414c70cb
LG		 2884 unsigned int mode;
2885
d92d95b6
SB		 2886 if (rdev->supply)
2887 input_uV = regulator_get_voltage(rdev->supply);
2888
414c70cb
LG		 2889 mutex_lock(&rdev->mutex);
2890
a4b41483
MB		 2891 /*
2892 * first check to see if we can set modes at all, otherwise just
2893 * tell the consumer everything is OK.
2894 */
414c70cb
LG		 2895 regulator->uA_load = uA_load;
2896 ret = regulator_check_drms(rdev);
a4b41483
MB		 2897 if (ret < 0) {
2898 ret = 0;
414c70cb 2899 goto out;
a4b41483 2900 }
414c70cb 2901
414c70cb
LG		 2902 if (!rdev->desc->ops->get_optimum_mode)
2903 goto out;
2904
a4b41483
MB		 2905 /*
2906 * we can actually do this so any errors are indicators of
2907 * potential real failure.
2908 */
2909 ret = -EINVAL;
2910
854ccbae
AL		 2911 if (!rdev->desc->ops->set_mode)
2912 goto out;
2913
414c70cb 2914 /* get output voltage */
1bf5a1f8 2915 output_uV = _regulator_get_voltage(rdev);
414c70cb 2916 if (output_uV <= 0) {
5da84fd9 2917 rdev_err(rdev, "invalid output voltage found\n");
414c70cb
LG		 2918 goto out;
2919 }
2920
d92d95b6 2921 /* No supply? Use constraint voltage */
1bf5a1f8 2922 if (input_uV <= 0)
414c70cb
LG		 2923 input_uV = rdev->constraints->input_uV;
2924 if (input_uV <= 0) {
5da84fd9 2925 rdev_err(rdev, "invalid input voltage found\n");
414c70cb
LG		 2926 goto out;
2927 }
2928
2929 /* calc total requested load for this regulator */
2930 list_for_each_entry(consumer, &rdev->consumer_list, list)
fa2984d4 2931 total_uA_load += consumer->uA_load;
414c70cb
LG		 2932
2933 mode = rdev->desc->ops->get_optimum_mode(rdev,
2934 input_uV, output_uV,
2935 total_uA_load);
2c608234 2936 ret = regulator_mode_constrain(rdev, &mode);
e573520b 2937 if (ret < 0) {
5da84fd9
JP		 2938 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2939 total_uA_load, input_uV, output_uV);
414c70cb
LG		 2940 goto out;
2941 }
2942
2943 ret = rdev->desc->ops->set_mode(rdev, mode);
e573520b 2944 if (ret < 0) {
5da84fd9 2945 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
414c70cb
LG		 2946 goto out;
2947 }
2948 ret = mode;
2949out:
2950 mutex_unlock(&rdev->mutex);
2951 return ret;
2952}
2953EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2954
df367931
MB		 2955/**
2956 * regulator_set_bypass_regmap - Default set_bypass() using regmap
2957 *
2958 * @rdev: device to operate on.
2959 * @enable: state to set.
2960 */
2961int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
2962{
2963 unsigned int val;
2964
2965 if (enable)
2966 val = rdev->desc->bypass_mask;
2967 else
2968 val = 0;
2969
2970 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
2971 rdev->desc->bypass_mask, val);
2972}
2973EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
2974
2975/**
2976 * regulator_get_bypass_regmap - Default get_bypass() using regmap
2977 *
2978 * @rdev: device to operate on.
2979 * @enable: current state.
2980 */
2981int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
2982{
2983 unsigned int val;
2984 int ret;
2985
2986 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
2987 if (ret != 0)
2988 return ret;
2989
2990 *enable = val & rdev->desc->bypass_mask;
2991
2992 return 0;
2993}
2994EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
2995
f59c8f9f
MB		 2996/**
2997 * regulator_allow_bypass - allow the regulator to go into bypass mode
2998 *
2999 * @regulator: Regulator to configure
9345dfb8 3000 * @enable: enable or disable bypass mode
f59c8f9f
MB		 3001 *
3002 * Allow the regulator to go into bypass mode if all other consumers
3003 * for the regulator also enable bypass mode and the machine
3004 * constraints allow this. Bypass mode means that the regulator is
3005 * simply passing the input directly to the output with no regulation.
3006 */
3007int regulator_allow_bypass(struct regulator *regulator, bool enable)
3008{
3009 struct regulator_dev *rdev = regulator->rdev;
3010 int ret = 0;
3011
3012 if (!rdev->desc->ops->set_bypass)
3013 return 0;
3014
3015 if (rdev->constraints &&
3016 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3017 return 0;
3018
3019 mutex_lock(&rdev->mutex);
3020
3021 if (enable && !regulator->bypass) {
3022 rdev->bypass_count++;
3023
3024 if (rdev->bypass_count == rdev->open_count) {
3025 ret = rdev->desc->ops->set_bypass(rdev, enable);
3026 if (ret != 0)
3027 rdev->bypass_count--;
3028 }
3029
3030 } else if (!enable && regulator->bypass) {
3031 rdev->bypass_count--;
3032
3033 if (rdev->bypass_count != rdev->open_count) {
3034 ret = rdev->desc->ops->set_bypass(rdev, enable);
3035 if (ret != 0)
3036 rdev->bypass_count++;
3037 }
3038 }
3039
3040 if (ret == 0)
3041 regulator->bypass = enable;
3042
3043 mutex_unlock(&rdev->mutex);
3044
3045 return ret;
3046}
3047EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3048
414c70cb
LG		 3049/**
3050 * regulator_register_notifier - register regulator event notifier
3051 * @regulator: regulator source
69279fb9 3052 * @nb: notifier block
414c70cb
LG		 3053 *
3054 * Register notifier block to receive regulator events.
3055 */
3056int regulator_register_notifier(struct regulator *regulator,
3057 struct notifier_block *nb)
3058{
3059 return blocking_notifier_chain_register(&regulator->rdev->notifier,
3060 nb);
3061}
3062EXPORT_SYMBOL_GPL(regulator_register_notifier);
3063
3064/**
3065 * regulator_unregister_notifier - unregister regulator event notifier
3066 * @regulator: regulator source
69279fb9 3067 * @nb: notifier block
414c70cb
LG		 3068 *
3069 * Unregister regulator event notifier block.
3070 */
3071int regulator_unregister_notifier(struct regulator *regulator,
3072 struct notifier_block *nb)
3073{
3074 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
3075 nb);
3076}
3077EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3078
b136fb44
JC		 3079/* notify regulator consumers and downstream regulator consumers.
3080 * Note mutex must be held by caller.
3081 */
414c70cb
LG		 3082static void _notifier_call_chain(struct regulator_dev *rdev,
3083 unsigned long event, void *data)
3084{
414c70cb 3085 /* call rdev chain first */
d8493d21 3086 blocking_notifier_call_chain(&rdev->notifier, event, data);
414c70cb
LG		 3087}
3088
3089/**
3090 * regulator_bulk_get - get multiple regulator consumers
3091 *
3092 * @dev: Device to supply
3093 * @num_consumers: Number of consumers to register
3094 * @consumers: Configuration of consumers; clients are stored here.
3095 *
3096 * @return 0 on success, an errno on failure.
3097 *
3098 * This helper function allows drivers to get several regulator
3099 * consumers in one operation. If any of the regulators cannot be
3100 * acquired then any regulators that were allocated will be freed
3101 * before returning to the caller.
3102 */
3103int regulator_bulk_get(struct device *dev, int num_consumers,
3104 struct regulator_bulk_data *consumers)
3105{
3106 int i;
3107 int ret;
3108
3109 for (i = 0; i < num_consumers; i++)
3110 consumers[i].consumer = NULL;
3111
3112 for (i = 0; i < num_consumers; i++) {
3113 consumers[i].consumer = regulator_get(dev,
3114 consumers[i].supply);
3115 if (IS_ERR(consumers[i].consumer)) {
414c70cb 3116 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 3117 dev_err(dev, "Failed to get supply '%s': %d\n",
3118 consumers[i].supply, ret);
414c70cb
LG		 3119 consumers[i].consumer = NULL;
3120 goto err;
3121 }
3122 }
3123
3124 return 0;
3125
3126err:
b29c7690 3127 while (--i >= 0)
414c70cb
LG		 3128 regulator_put(consumers[i].consumer);
3129
3130 return ret;
3131}
3132EXPORT_SYMBOL_GPL(regulator_bulk_get);
3133
e6e74030
MB		 3134/**
3135 * devm_regulator_bulk_get - managed get multiple regulator consumers
3136 *
3137 * @dev: Device to supply
3138 * @num_consumers: Number of consumers to register
3139 * @consumers: Configuration of consumers; clients are stored here.
3140 *
3141 * @return 0 on success, an errno on failure.
3142 *
3143 * This helper function allows drivers to get several regulator
3144 * consumers in one operation with management, the regulators will
3145 * automatically be freed when the device is unbound. If any of the
3146 * regulators cannot be acquired then any regulators that were
3147 * allocated will be freed before returning to the caller.
3148 */
3149int devm_regulator_bulk_get(struct device *dev, int num_consumers,
3150 struct regulator_bulk_data *consumers)
3151{
3152 int i;
3153 int ret;
3154
3155 for (i = 0; i < num_consumers; i++)
3156 consumers[i].consumer = NULL;
3157
3158 for (i = 0; i < num_consumers; i++) {
3159 consumers[i].consumer = devm_regulator_get(dev,
3160 consumers[i].supply);
3161 if (IS_ERR(consumers[i].consumer)) {
3162 ret = PTR_ERR(consumers[i].consumer);
3163 dev_err(dev, "Failed to get supply '%s': %d\n",
3164 consumers[i].supply, ret);
3165 consumers[i].consumer = NULL;
3166 goto err;
3167 }
3168 }
3169
3170 return 0;
3171
3172err:
3173 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
3174 devm_regulator_put(consumers[i].consumer);
3175
3176 return ret;
3177}
3178EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
3179
f21e0e81
MB		 3180static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3181{
3182 struct regulator_bulk_data *bulk = data;
3183
3184 bulk->ret = regulator_enable(bulk->consumer);
3185}
3186
414c70cb
LG		 3187/**
3188 * regulator_bulk_enable - enable multiple regulator consumers
3189 *
3190 * @num_consumers: Number of consumers
3191 * @consumers: Consumer data; clients are stored here.
3192 * @return 0 on success, an errno on failure
3193 *
3194 * This convenience API allows consumers to enable multiple regulator
3195 * clients in a single API call. If any consumers cannot be enabled
3196 * then any others that were enabled will be disabled again prior to
3197 * return.
3198 */
3199int regulator_bulk_enable(int num_consumers,
3200 struct regulator_bulk_data *consumers)
3201{
2955b47d 3202 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
414c70cb 3203 int i;
f21e0e81 3204 int ret = 0;
414c70cb 3205
6492bc1b
MB		 3206 for (i = 0; i < num_consumers; i++) {
3207 if (consumers[i].consumer->always_on)
3208 consumers[i].ret = 0;
3209 else
3210 async_schedule_domain(regulator_bulk_enable_async,
3211 &consumers[i], &async_domain);
3212 }
f21e0e81
MB		 3213
3214 async_synchronize_full_domain(&async_domain);
3215
3216 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 3217 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 3218 if (consumers[i].ret != 0) {
3219 ret = consumers[i].ret;
414c70cb 3220 goto err;
f21e0e81 3221 }
414c70cb
LG		 3222 }
3223
3224 return 0;
3225
3226err:
fbe31057
AH		 3227 for (i = 0; i < num_consumers; i++) {
3228 if (consumers[i].ret < 0)
3229 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3230 consumers[i].ret);
3231 else
3232 regulator_disable(consumers[i].consumer);
3233 }
414c70cb
LG		 3234
3235 return ret;
3236}
3237EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3238
3239/**
3240 * regulator_bulk_disable - disable multiple regulator consumers
3241 *
3242 * @num_consumers: Number of consumers
3243 * @consumers: Consumer data; clients are stored here.
3244 * @return 0 on success, an errno on failure
3245 *
3246 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 3247 * clients in a single API call. If any consumers cannot be disabled
3248 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 3249 * return.
3250 */
3251int regulator_bulk_disable(int num_consumers,
3252 struct regulator_bulk_data *consumers)
3253{
3254 int i;
01e86f49 3255 int ret, r;
414c70cb 3256
49e22632 3257 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 3258 ret = regulator_disable(consumers[i].consumer);
3259 if (ret != 0)
3260 goto err;
3261 }
3262
3263 return 0;
3264
3265err:
5da84fd9 3266 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
01e86f49
MB		 3267 for (++i; i < num_consumers; ++i) {
3268 r = regulator_enable(consumers[i].consumer);
3269 if (r != 0)
3270 pr_err("Failed to reename %s: %d\n",
3271 consumers[i].supply, r);
3272 }
414c70cb
LG		 3273
3274 return ret;
3275}
3276EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3277
e1de2f42
DK		 3278/**
3279 * regulator_bulk_force_disable - force disable multiple regulator consumers
3280 *
3281 * @num_consumers: Number of consumers
3282 * @consumers: Consumer data; clients are stored here.
3283 * @return 0 on success, an errno on failure
3284 *
3285 * This convenience API allows consumers to forcibly disable multiple regulator
3286 * clients in a single API call.
3287 * NOTE: This should be used for situations when device damage will
3288 * likely occur if the regulators are not disabled (e.g. over temp).
3289 * Although regulator_force_disable function call for some consumers can
3290 * return error numbers, the function is called for all consumers.
3291 */
3292int regulator_bulk_force_disable(int num_consumers,
3293 struct regulator_bulk_data *consumers)
3294{
3295 int i;
3296 int ret;
3297
3298 for (i = 0; i < num_consumers; i++)
3299 consumers[i].ret =
3300 regulator_force_disable(consumers[i].consumer);
3301
3302 for (i = 0; i < num_consumers; i++) {
3303 if (consumers[i].ret != 0) {
3304 ret = consumers[i].ret;
3305 goto out;
3306 }
3307 }
3308
3309 return 0;
3310out:
3311 return ret;
3312}
3313EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3314
414c70cb
LG		 3315/**
3316 * regulator_bulk_free - free multiple regulator consumers
3317 *
3318 * @num_consumers: Number of consumers
3319 * @consumers: Consumer data; clients are stored here.
3320 *
3321 * This convenience API allows consumers to free multiple regulator
3322 * clients in a single API call.
3323 */
3324void regulator_bulk_free(int num_consumers,
3325 struct regulator_bulk_data *consumers)
3326{
3327 int i;
3328
3329 for (i = 0; i < num_consumers; i++) {
3330 regulator_put(consumers[i].consumer);
3331 consumers[i].consumer = NULL;
3332 }
3333}
3334EXPORT_SYMBOL_GPL(regulator_bulk_free);
3335
3336/**
3337 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 3338 * @rdev: regulator source
414c70cb 3339 * @event: notifier block
69279fb9 3340 * @data: callback-specific data.
414c70cb
LG		 3341 *
3342 * Called by regulator drivers to notify clients a regulator event has
3343 * occurred. We also notify regulator clients downstream.
b136fb44 3344 * Note lock must be held by caller.
414c70cb
LG		 3345 */
3346int regulator_notifier_call_chain(struct regulator_dev *rdev,
3347 unsigned long event, void *data)
3348{
3349 _notifier_call_chain(rdev, event, data);
3350 return NOTIFY_DONE;
3351
3352}
3353EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3354
be721979
MB		 3355/**
3356 * regulator_mode_to_status - convert a regulator mode into a status
3357 *
3358 * @mode: Mode to convert
3359 *
3360 * Convert a regulator mode into a status.
3361 */
3362int regulator_mode_to_status(unsigned int mode)
3363{
3364 switch (mode) {
3365 case REGULATOR_MODE_FAST:
3366 return REGULATOR_STATUS_FAST;
3367 case REGULATOR_MODE_NORMAL:
3368 return REGULATOR_STATUS_NORMAL;
3369 case REGULATOR_MODE_IDLE:
3370 return REGULATOR_STATUS_IDLE;
03ffcf3d 3371 case REGULATOR_MODE_STANDBY:
be721979
MB		 3372 return REGULATOR_STATUS_STANDBY;
3373 default:
1beaf762 3374 return REGULATOR_STATUS_UNDEFINED;
be721979
MB		 3375 }
3376}
3377EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3378
7ad68e2f
DB		 3379/*
3380 * To avoid cluttering sysfs (and memory) with useless state, only
3381 * create attributes that can be meaningfully displayed.
3382 */
3383static int add_regulator_attributes(struct regulator_dev *rdev)
3384{
3385 struct device *dev = &rdev->dev;
3386 struct regulator_ops *ops = rdev->desc->ops;
3387 int status = 0;
3388
3389 /* some attributes need specific methods to be displayed */
4c78899b 3390 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
f2889e65
MB		 3391 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3392 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) {
7ad68e2f
DB		 3393 status = device_create_file(dev, &dev_attr_microvolts);
3394 if (status < 0)
3395 return status;
3396 }
3397 if (ops->get_current_limit) {
3398 status = device_create_file(dev, &dev_attr_microamps);
3399 if (status < 0)
3400 return status;
3401 }
3402 if (ops->get_mode) {
3403 status = device_create_file(dev, &dev_attr_opmode);
3404 if (status < 0)
3405 return status;
3406 }
7b74d149 3407 if (rdev->ena_pin || ops->is_enabled) {
7ad68e2f
DB		 3408 status = device_create_file(dev, &dev_attr_state);
3409 if (status < 0)
3410 return status;
3411 }
853116a1
DB		 3412 if (ops->get_status) {
3413 status = device_create_file(dev, &dev_attr_status);
3414 if (status < 0)
3415 return status;
3416 }
f59c8f9f
MB		 3417 if (ops->get_bypass) {
3418 status = device_create_file(dev, &dev_attr_bypass);
3419 if (status < 0)
3420 return status;
3421 }
7ad68e2f
DB		 3422
3423 /* some attributes are type-specific */
3424 if (rdev->desc->type == REGULATOR_CURRENT) {
3425 status = device_create_file(dev, &dev_attr_requested_microamps);
3426 if (status < 0)
3427 return status;
3428 }
3429
3430 /* all the other attributes exist to support constraints;
3431 * don't show them if there are no constraints, or if the
3432 * relevant supporting methods are missing.
3433 */
3434 if (!rdev->constraints)
3435 return status;
3436
3437 /* constraints need specific supporting methods */
e8eef82b 3438 if (ops->set_voltage || ops->set_voltage_sel) {
7ad68e2f
DB		 3439 status = device_create_file(dev, &dev_attr_min_microvolts);
3440 if (status < 0)
3441 return status;
3442 status = device_create_file(dev, &dev_attr_max_microvolts);
3443 if (status < 0)
3444 return status;
3445 }
3446 if (ops->set_current_limit) {
3447 status = device_create_file(dev, &dev_attr_min_microamps);
3448 if (status < 0)
3449 return status;
3450 status = device_create_file(dev, &dev_attr_max_microamps);
3451 if (status < 0)
3452 return status;
3453 }
3454
7ad68e2f
DB		 3455 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3456 if (status < 0)
3457 return status;
3458 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3459 if (status < 0)
3460 return status;
3461 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3462 if (status < 0)
3463 return status;
3464
3465 if (ops->set_suspend_voltage) {
3466 status = device_create_file(dev,
3467 &dev_attr_suspend_standby_microvolts);
3468 if (status < 0)
3469 return status;
3470 status = device_create_file(dev,
3471 &dev_attr_suspend_mem_microvolts);
3472 if (status < 0)
3473 return status;
3474 status = device_create_file(dev,
3475 &dev_attr_suspend_disk_microvolts);
3476 if (status < 0)
3477 return status;
3478 }
3479
3480 if (ops->set_suspend_mode) {
3481 status = device_create_file(dev,
3482 &dev_attr_suspend_standby_mode);
3483 if (status < 0)
3484 return status;
3485 status = device_create_file(dev,
3486 &dev_attr_suspend_mem_mode);
3487 if (status < 0)
3488 return status;
3489 status = device_create_file(dev,
3490 &dev_attr_suspend_disk_mode);
3491 if (status < 0)
3492 return status;
3493 }
3494
3495 return status;
3496}
3497
1130e5b3
MB		 3498static void rdev_init_debugfs(struct regulator_dev *rdev)
3499{
1130e5b3 3500 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
24751434 3501 if (!rdev->debugfs) {
1130e5b3 3502 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 3503 return;
3504 }
3505
3506 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3507 &rdev->use_count);
3508 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3509 &rdev->open_count);
f59c8f9f
MB		 3510 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3511 &rdev->bypass_count);
1130e5b3
MB		 3512}
3513
414c70cb
LG		 3514/**
3515 * regulator_register - register regulator
69279fb9 3516 * @regulator_desc: regulator to register
c172708d 3517 * @config: runtime configuration for regulator
414c70cb
LG		 3518 *
3519 * Called by regulator drivers to register a regulator.
0384618a
AL		 3520 * Returns a valid pointer to struct regulator_dev on success
3521 * or an ERR_PTR() on error.
414c70cb 3522 */
65f26846
MB		 3523struct regulator_dev *
3524regulator_register(const struct regulator_desc *regulator_desc,
c172708d 3525 const struct regulator_config *config)
414c70cb 3526{
9a8f5e07 3527 const struct regulation_constraints *constraints = NULL;
c172708d 3528 const struct regulator_init_data *init_data;
414c70cb
LG		 3529 static atomic_t regulator_no = ATOMIC_INIT(0);
3530 struct regulator_dev *rdev;
32c8fad4 3531 struct device *dev;
a5766f11 3532 int ret, i;
69511a45 3533 const char *supply = NULL;
414c70cb 3534
c172708d 3535 if (regulator_desc == NULL || config == NULL)
414c70cb
LG		 3536 return ERR_PTR(-EINVAL);
3537
32c8fad4 3538 dev = config->dev;
dcf70112 3539 WARN_ON(!dev);
32c8fad4 3540
414c70cb
LG		 3541 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3542 return ERR_PTR(-EINVAL);
3543
cd78dfc6
DL		 3544 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3545 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 3546 return ERR_PTR(-EINVAL);
3547
476c2d83
MB		 3548 /* Only one of each should be implemented */
3549 WARN_ON(regulator_desc->ops->get_voltage &&
3550 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 3551 WARN_ON(regulator_desc->ops->set_voltage &&
3552 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 3553
3554 /* If we're using selectors we must implement list_voltage. */
3555 if (regulator_desc->ops->get_voltage_sel &&
3556 !regulator_desc->ops->list_voltage) {
3557 return ERR_PTR(-EINVAL);
3558 }
e8eef82b
MB		 3559 if (regulator_desc->ops->set_voltage_sel &&
3560 !regulator_desc->ops->list_voltage) {
3561 return ERR_PTR(-EINVAL);
3562 }
476c2d83 3563
c172708d
MB		 3564 init_data = config->init_data;
3565
414c70cb
LG		 3566 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3567 if (rdev == NULL)
3568 return ERR_PTR(-ENOMEM);
3569
3570 mutex_lock(&regulator_list_mutex);
3571
3572 mutex_init(&rdev->mutex);
c172708d 3573 rdev->reg_data = config->driver_data;
414c70cb
LG		 3574 rdev->owner = regulator_desc->owner;
3575 rdev->desc = regulator_desc;
3a4b0a07
MB		 3576 if (config->regmap)
3577 rdev->regmap = config->regmap;
52b84dac 3578 else if (dev_get_regmap(dev, NULL))
3a4b0a07 3579 rdev->regmap = dev_get_regmap(dev, NULL);
52b84dac
AC		 3580 else if (dev->parent)
3581 rdev->regmap = dev_get_regmap(dev->parent, NULL);
414c70cb 3582 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 3583 INIT_LIST_HEAD(&rdev->list);
414c70cb 3584 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 3585 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 3586
a5766f11 3587 /* preform any regulator specific init */
9a8f5e07 3588 if (init_data && init_data->regulator_init) {
a5766f11 3589 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 3590 if (ret < 0)
3591 goto clean;
a5766f11
LG		 3592 }
3593
a5766f11 3594 /* register with sysfs */
414c70cb 3595 rdev->dev.class = &regulator_class;
c172708d 3596 rdev->dev.of_node = config->of_node;
a5766f11 3597 rdev->dev.parent = dev;
812460a9
KS		 3598 dev_set_name(&rdev->dev, "regulator.%d",
3599 atomic_inc_return(&regulator_no) - 1);
a5766f11 3600 ret = device_register(&rdev->dev);
ad7725cb
VK		 3601 if (ret != 0) {
3602 put_device(&rdev->dev);
4fca9545 3603 goto clean;
ad7725cb 3604 }
a5766f11
LG		 3605
3606 dev_set_drvdata(&rdev->dev, rdev);
3607
b2a1ef47 3608 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
f19b00da 3609 ret = regulator_ena_gpio_request(rdev, config);
65f73508
MB		 3610 if (ret != 0) {
3611 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3612 config->ena_gpio, ret);
b2da55d9 3613 goto wash;
65f73508
MB		 3614 }
3615
65f73508
MB		 3616 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3617 rdev->ena_gpio_state = 1;
3618
7b74d149 3619 if (config->ena_gpio_invert)
65f73508
MB		 3620 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3621 }
3622
74f544c1 3623 /* set regulator constraints */
9a8f5e07
MB		 3624 if (init_data)
3625 constraints = &init_data->constraints;
3626
3627 ret = set_machine_constraints(rdev, constraints);
74f544c1
MR		 3628 if (ret < 0)
3629 goto scrub;
3630
7ad68e2f
DB		 3631 /* add attributes supported by this regulator */
3632 ret = add_regulator_attributes(rdev);
3633 if (ret < 0)
3634 goto scrub;
3635
9a8f5e07 3636 if (init_data && init_data->supply_regulator)
69511a45
RN		 3637 supply = init_data->supply_regulator;
3638 else if (regulator_desc->supply_name)
3639 supply = regulator_desc->supply_name;
3640
3641 if (supply) {
0178f3e2 3642 struct regulator_dev *r;
0178f3e2 3643
6d191a5f 3644 r = regulator_dev_lookup(dev, supply, &ret);
0178f3e2 3645
0f7b87f0
AB		 3646 if (ret == -ENODEV) {
3647 /*
3648 * No supply was specified for this regulator and
3649 * there will never be one.
3650 */
3651 ret = 0;
3652 goto add_dev;
3653 } else if (!r) {
69511a45 3654 dev_err(dev, "Failed to find supply %s\n", supply);
04bf3011 3655 ret = -EPROBE_DEFER;
0178f3e2
MB		 3656 goto scrub;
3657 }
3658
3659 ret = set_supply(rdev, r);
3660 if (ret < 0)
3661 goto scrub;
b2296bd4
LD		 3662
3663 /* Enable supply if rail is enabled */
b1a86831 3664 if (_regulator_is_enabled(rdev)) {
b2296bd4
LD		 3665 ret = regulator_enable(rdev->supply);
3666 if (ret < 0)
3667 goto scrub;
3668 }
0178f3e2
MB		 3669 }
3670
0f7b87f0 3671add_dev:
a5766f11 3672 /* add consumers devices */
9a8f5e07
MB		 3673 if (init_data) {
3674 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3675 ret = set_consumer_device_supply(rdev,
9a8f5e07 3676 init_data->consumer_supplies[i].dev_name,
23c2f041 3677 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 3678 if (ret < 0) {
3679 dev_err(dev, "Failed to set supply %s\n",
3680 init_data->consumer_supplies[i].supply);
3681 goto unset_supplies;
3682 }
23c2f041 3683 }
414c70cb 3684 }
a5766f11
LG		 3685
3686 list_add(&rdev->list, &regulator_list);
1130e5b3
MB		 3687
3688 rdev_init_debugfs(rdev);
a5766f11 3689out:
414c70cb
LG		 3690 mutex_unlock(&regulator_list_mutex);
3691 return rdev;
4fca9545 3692
d4033b54
JN		 3693unset_supplies:
3694 unset_regulator_supplies(rdev);
3695
4fca9545 3696scrub:
e81dba85 3697 if (rdev->supply)
23ff2f0f 3698 _regulator_put(rdev->supply);
f19b00da 3699 regulator_ena_gpio_free(rdev);
1a6958e7 3700 kfree(rdev->constraints);
b2da55d9 3701wash:
4fca9545 3702 device_unregister(&rdev->dev);
53032daf
PW		 3703 /* device core frees rdev */
3704 rdev = ERR_PTR(ret);
3705 goto out;
3706
4fca9545
DB		 3707clean:
3708 kfree(rdev);
3709 rdev = ERR_PTR(ret);
3710 goto out;
414c70cb
LG		 3711}
3712EXPORT_SYMBOL_GPL(regulator_register);
3713
3714/**
3715 * regulator_unregister - unregister regulator
69279fb9 3716 * @rdev: regulator to unregister
414c70cb
LG		 3717 *
3718 * Called by regulator drivers to unregister a regulator.
3719 */
3720void regulator_unregister(struct regulator_dev *rdev)
3721{
3722 if (rdev == NULL)
3723 return;
3724
e032b376
MB		 3725 if (rdev->supply)
3726 regulator_put(rdev->supply);
414c70cb 3727 mutex_lock(&regulator_list_mutex);
1130e5b3 3728 debugfs_remove_recursive(rdev->debugfs);
43829731 3729 flush_work(&rdev->disable_work.work);
6bf87d17 3730 WARN_ON(rdev->open_count);
0f1d747b 3731 unset_regulator_supplies(rdev);
414c70cb 3732 list_del(&rdev->list);
f8c12fe3 3733 kfree(rdev->constraints);
f19b00da 3734 regulator_ena_gpio_free(rdev);
58fb5cf5 3735 device_unregister(&rdev->dev);
414c70cb
LG		 3736 mutex_unlock(&regulator_list_mutex);
3737}
3738EXPORT_SYMBOL_GPL(regulator_unregister);
3739
414c70cb 3740/**
cf7bbcdf 3741 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 3742 * @state: system suspend state
3743 *
3744 * Configure each regulator with it's suspend operating parameters for state.
3745 * This will usually be called by machine suspend code prior to supending.
3746 */
3747int regulator_suspend_prepare(suspend_state_t state)
3748{
3749 struct regulator_dev *rdev;
3750 int ret = 0;
3751
3752 /* ON is handled by regulator active state */
3753 if (state == PM_SUSPEND_ON)
3754 return -EINVAL;
3755
3756 mutex_lock(&regulator_list_mutex);
3757 list_for_each_entry(rdev, &regulator_list, list) {
3758
3759 mutex_lock(&rdev->mutex);
3760 ret = suspend_prepare(rdev, state);
3761 mutex_unlock(&rdev->mutex);
3762
3763 if (ret < 0) {
5da84fd9 3764 rdev_err(rdev, "failed to prepare\n");
414c70cb
LG		 3765 goto out;
3766 }
3767 }
3768out:
3769 mutex_unlock(&regulator_list_mutex);
3770 return ret;
3771}
3772EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3773
7a32b589
MH		 3774/**
3775 * regulator_suspend_finish - resume regulators from system wide suspend
3776 *
3777 * Turn on regulators that might be turned off by regulator_suspend_prepare
3778 * and that should be turned on according to the regulators properties.
3779 */
3780int regulator_suspend_finish(void)
3781{
3782 struct regulator_dev *rdev;
3783 int ret = 0, error;
3784
3785 mutex_lock(&regulator_list_mutex);
3786 list_for_each_entry(rdev, &regulator_list, list) {
3787 struct regulator_ops *ops = rdev->desc->ops;
3788
3789 mutex_lock(&rdev->mutex);
3790 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3791 ops->enable) {
3792 error = ops->enable(rdev);
3793 if (error)
3794 ret = error;
3795 } else {
3796 if (!has_full_constraints)
3797 goto unlock;
3798 if (!ops->disable)
3799 goto unlock;
b1a86831 3800 if (!_regulator_is_enabled(rdev))
7a32b589
MH		 3801 goto unlock;
3802
3803 error = ops->disable(rdev);
3804 if (error)
3805 ret = error;
3806 }
3807unlock:
3808 mutex_unlock(&rdev->mutex);
3809 }
3810 mutex_unlock(&regulator_list_mutex);
3811 return ret;
3812}
3813EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3814
ca725561
MB		 3815/**
3816 * regulator_has_full_constraints - the system has fully specified constraints
3817 *
3818 * Calling this function will cause the regulator API to disable all
3819 * regulators which have a zero use count and don't have an always_on
3820 * constraint in a late_initcall.
3821 *
3822 * The intention is that this will become the default behaviour in a
3823 * future kernel release so users are encouraged to use this facility
3824 * now.
3825 */
3826void regulator_has_full_constraints(void)
3827{
3828 has_full_constraints = 1;
3829}
3830EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3831
688fe99a
MB		 3832/**
3833 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3834 *
3835 * Calling this function will cause the regulator API to provide a
3836 * dummy regulator to consumers if no physical regulator is found,
3837 * allowing most consumers to proceed as though a regulator were
3838 * configured. This allows systems such as those with software
3839 * controllable regulators for the CPU core only to be brought up more
3840 * readily.
3841 */
3842void regulator_use_dummy_regulator(void)
3843{
3844 board_wants_dummy_regulator = true;
3845}
3846EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3847
414c70cb
LG		 3848/**
3849 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 3850 * @rdev: regulator
414c70cb
LG		 3851 *
3852 * Get rdev regulator driver private data. This call can be used in the
3853 * regulator driver context.
3854 */
3855void *rdev_get_drvdata(struct regulator_dev *rdev)
3856{
3857 return rdev->reg_data;
3858}
3859EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3860
3861/**
3862 * regulator_get_drvdata - get regulator driver data
3863 * @regulator: regulator
3864 *
3865 * Get regulator driver private data. This call can be used in the consumer
3866 * driver context when non API regulator specific functions need to be called.
3867 */
3868void *regulator_get_drvdata(struct regulator *regulator)
3869{
3870 return regulator->rdev->reg_data;
3871}
3872EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3873
3874/**
3875 * regulator_set_drvdata - set regulator driver data
3876 * @regulator: regulator
3877 * @data: data
3878 */
3879void regulator_set_drvdata(struct regulator *regulator, void *data)
3880{
3881 regulator->rdev->reg_data = data;
3882}
3883EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3884
3885/**
3886 * regulator_get_id - get regulator ID
69279fb9 3887 * @rdev: regulator
414c70cb
LG		 3888 */
3889int rdev_get_id(struct regulator_dev *rdev)
3890{
3891 return rdev->desc->id;
3892}
3893EXPORT_SYMBOL_GPL(rdev_get_id);
3894
a5766f11
LG		 3895struct device *rdev_get_dev(struct regulator_dev *rdev)
3896{
3897 return &rdev->dev;
3898}
3899EXPORT_SYMBOL_GPL(rdev_get_dev);
3900
3901void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3902{
3903 return reg_init_data->driver_data;
3904}
3905EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3906
ba55a974
MB		 3907#ifdef CONFIG_DEBUG_FS
3908static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3909 size_t count, loff_t *ppos)
3910{
3911 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3912 ssize_t len, ret = 0;
3913 struct regulator_map *map;
3914
3915 if (!buf)
3916 return -ENOMEM;
3917
3918 list_for_each_entry(map, &regulator_map_list, list) {
3919 len = snprintf(buf + ret, PAGE_SIZE - ret,
3920 "%s -> %s.%s\n",
3921 rdev_get_name(map->regulator), map->dev_name,
3922 map->supply);
3923 if (len >= 0)
3924 ret += len;
3925 if (ret > PAGE_SIZE) {
3926 ret = PAGE_SIZE;
3927 break;
3928 }
3929 }
3930
3931 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3932
3933 kfree(buf);
3934
3935 return ret;
3936}
24751434 3937#endif
ba55a974
MB		 3938
3939static const struct file_operations supply_map_fops = {
24751434 3940#ifdef CONFIG_DEBUG_FS
ba55a974
MB		 3941 .read = supply_map_read_file,
3942 .llseek = default_llseek,
ba55a974 3943#endif
24751434 3944};
ba55a974 3945
414c70cb
LG		 3946static int __init regulator_init(void)
3947{
34abbd68
MB		 3948 int ret;
3949
34abbd68
MB		 3950 ret = class_register(&regulator_class);
3951
1130e5b3 3952 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 3953 if (!debugfs_root)
1130e5b3 3954 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 3955
f4d562c6
MB		 3956 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3957 &supply_map_fops);
1130e5b3 3958
34abbd68
MB		 3959 regulator_dummy_init();
3960
3961 return ret;
414c70cb
LG		 3962}
3963
3964/* init early to allow our consumers to complete system booting */
3965core_initcall(regulator_init);
ca725561
MB		 3966
3967static int __init regulator_init_complete(void)
3968{
3969 struct regulator_dev *rdev;
3970 struct regulator_ops *ops;
3971 struct regulation_constraints *c;
3972 int enabled, ret;
ca725561 3973
86f5fcfc
MB		 3974 /*
3975 * Since DT doesn't provide an idiomatic mechanism for
3976 * enabling full constraints and since it's much more natural
3977 * with DT to provide them just assume that a DT enabled
3978 * system has full constraints.
3979 */
3980 if (of_have_populated_dt())
3981 has_full_constraints = true;
3982
ca725561
MB		 3983 mutex_lock(&regulator_list_mutex);
3984
3985 /* If we have a full configuration then disable any regulators
3986 * which are not in use or always_on. This will become the
3987 * default behaviour in the future.
3988 */
3989 list_for_each_entry(rdev, &regulator_list, list) {
3990 ops = rdev->desc->ops;
3991 c = rdev->constraints;
3992
f25e0b4f 3993 if (!ops->disable || (c && c->always_on))
ca725561
MB		 3994 continue;
3995
3996 mutex_lock(&rdev->mutex);
3997
3998 if (rdev->use_count)
3999 goto unlock;
4000
4001 /* If we can't read the status assume it's on. */
4002 if (ops->is_enabled)
4003 enabled = ops->is_enabled(rdev);
4004 else
4005 enabled = 1;
4006
4007 if (!enabled)
4008 goto unlock;
4009
4010 if (has_full_constraints) {
4011 /* We log since this may kill the system if it
4012 * goes wrong. */
5da84fd9 4013 rdev_info(rdev, "disabling\n");
ca725561
MB		 4014 ret = ops->disable(rdev);
4015 if (ret != 0) {
5da84fd9 4016 rdev_err(rdev, "couldn't disable: %d\n", ret);
ca725561
MB		 4017 }
4018 } else {
4019 /* The intention is that in future we will
4020 * assume that full constraints are provided
4021 * so warn even if we aren't going to do
4022 * anything here.
4023 */
5da84fd9 4024 rdev_warn(rdev, "incomplete constraints, leaving on\n");
ca725561
MB		 4025 }
4026
4027unlock:
4028 mutex_unlock(&rdev->mutex);
4029 }
4030
4031 mutex_unlock(&regulator_list_mutex);
4032
4033 return 0;
4034}
4035late_initcall(regulator_init_complete);
Linux 6.x block layer and io_uring tree(s)