projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
regulator: wm8994: Convert to set_voltage_sel()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / regulator / core.c
CommitLineData
414c70cb
LG		 1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
a5766f11 5 * Copyright 2008 SlimLogic Ltd.
414c70cb 6 *
a5766f11 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
414c70cb
LG		 8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
1130e5b3 18#include <linux/debugfs.h>
414c70cb 19#include <linux/device.h>
5a0e3ad6 20#include <linux/slab.h>
f21e0e81 21#include <linux/async.h>
414c70cb
LG		 22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
31aae2be 25#include <linux/delay.h>
69511a45
RN		 26#include <linux/of.h>
27#include <linux/regulator/of_regulator.h>
414c70cb
LG		 28#include <linux/regulator/consumer.h>
29#include <linux/regulator/driver.h>
30#include <linux/regulator/machine.h>
65602c32 31#include <linux/module.h>
414c70cb 32
02fa3ec0
MB		 33#define CREATE_TRACE_POINTS
34#include <trace/events/regulator.h>
35
34abbd68
MB		 36#include "dummy.h"
37
7d51a0db
MB		 38#define rdev_crit(rdev, fmt, ...) \
39 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
5da84fd9
JP		 40#define rdev_err(rdev, fmt, ...) \
41 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
42#define rdev_warn(rdev, fmt, ...) \
43 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44#define rdev_info(rdev, fmt, ...) \
45 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_dbg(rdev, fmt, ...) \
47 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48
414c70cb
LG		 49static DEFINE_MUTEX(regulator_list_mutex);
50static LIST_HEAD(regulator_list);
51static LIST_HEAD(regulator_map_list);
21cf891a 52static bool has_full_constraints;
688fe99a 53static bool board_wants_dummy_regulator;
414c70cb 54
1130e5b3 55static struct dentry *debugfs_root;
1130e5b3 56
8dc5390d 57/*
414c70cb
LG		 58 * struct regulator_map
59 *
60 * Used to provide symbolic supply names to devices.
61 */
62struct regulator_map {
63 struct list_head list;
40f9244f 64 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 65 const char *supply;
a5766f11 66 struct regulator_dev *regulator;
414c70cb
LG		 67};
68
414c70cb
LG		 69/*
70 * struct regulator
71 *
72 * One for each consumer device.
73 */
74struct regulator {
75 struct device *dev;
76 struct list_head list;
77 int uA_load;
78 int min_uV;
79 int max_uV;
414c70cb
LG		 80 char *supply_name;
81 struct device_attribute dev_attr;
82 struct regulator_dev *rdev;
5de70519 83 struct dentry *debugfs;
414c70cb
LG		 84};
85
86static int _regulator_is_enabled(struct regulator_dev *rdev);
3801b86a 87static int _regulator_disable(struct regulator_dev *rdev);
414c70cb
LG		 88static int _regulator_get_voltage(struct regulator_dev *rdev);
89static int _regulator_get_current_limit(struct regulator_dev *rdev);
90static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
91static void _notifier_call_chain(struct regulator_dev *rdev,
92 unsigned long event, void *data);
75790251
MB		 93static int _regulator_do_set_voltage(struct regulator_dev *rdev,
94 int min_uV, int max_uV);
3801b86a
MB		 95static struct regulator *create_regulator(struct regulator_dev *rdev,
96 struct device *dev,
97 const char *supply_name);
414c70cb 98
1083c393
MB		 99static const char *rdev_get_name(struct regulator_dev *rdev)
100{
101 if (rdev->constraints && rdev->constraints->name)
102 return rdev->constraints->name;
103 else if (rdev->desc->name)
104 return rdev->desc->name;
105 else
106 return "";
107}
108
414c70cb
LG		 109/* gets the regulator for a given consumer device */
110static struct regulator *get_device_regulator(struct device *dev)
111{
112 struct regulator *regulator = NULL;
113 struct regulator_dev *rdev;
114
115 mutex_lock(&regulator_list_mutex);
116 list_for_each_entry(rdev, &regulator_list, list) {
117 mutex_lock(&rdev->mutex);
118 list_for_each_entry(regulator, &rdev->consumer_list, list) {
119 if (regulator->dev == dev) {
120 mutex_unlock(&rdev->mutex);
121 mutex_unlock(&regulator_list_mutex);
122 return regulator;
123 }
124 }
125 mutex_unlock(&rdev->mutex);
126 }
127 mutex_unlock(&regulator_list_mutex);
128 return NULL;
129}
130
69511a45
RN		 131/**
132 * of_get_regulator - get a regulator device node based on supply name
133 * @dev: Device pointer for the consumer (of regulator) device
134 * @supply: regulator supply name
135 *
136 * Extract the regulator device node corresponding to the supply name.
137 * retruns the device node corresponding to the regulator if found, else
138 * returns NULL.
139 */
140static struct device_node *of_get_regulator(struct device *dev, const char *supply)
141{
142 struct device_node *regnode = NULL;
143 char prop_name[32]; /* 32 is max size of property name */
144
145 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
146
147 snprintf(prop_name, 32, "%s-supply", supply);
148 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
149
150 if (!regnode) {
16fbcc3b 151 dev_dbg(dev, "Looking up %s property in node %s failed",
69511a45
RN		 152 prop_name, dev->of_node->full_name);
153 return NULL;
154 }
155 return regnode;
156}
157
414c70cb
LG		 158/* Platform voltage constraint check */
159static int regulator_check_voltage(struct regulator_dev *rdev,
160 int *min_uV, int *max_uV)
161{
162 BUG_ON(*min_uV > *max_uV);
163
164 if (!rdev->constraints) {
5da84fd9 165 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 166 return -ENODEV;
167 }
168 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
5da84fd9 169 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 170 return -EPERM;
171 }
172
173 if (*max_uV > rdev->constraints->max_uV)
174 *max_uV = rdev->constraints->max_uV;
175 if (*min_uV < rdev->constraints->min_uV)
176 *min_uV = rdev->constraints->min_uV;
177
89f425ed
MB		 178 if (*min_uV > *max_uV) {
179 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 180 *min_uV, *max_uV);
414c70cb 181 return -EINVAL;
89f425ed 182 }
414c70cb
LG		 183
184 return 0;
185}
186
05fda3b1
TP		 187/* Make sure we select a voltage that suits the needs of all
188 * regulator consumers
189 */
190static int regulator_check_consumers(struct regulator_dev *rdev,
191 int *min_uV, int *max_uV)
192{
193 struct regulator *regulator;
194
195 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4aa922c0
MB		 196 /*
197 * Assume consumers that didn't say anything are OK
198 * with anything in the constraint range.
199 */
200 if (!regulator->min_uV && !regulator->max_uV)
201 continue;
202
05fda3b1
TP		 203 if (*max_uV > regulator->max_uV)
204 *max_uV = regulator->max_uV;
205 if (*min_uV < regulator->min_uV)
206 *min_uV = regulator->min_uV;
207 }
208
209 if (*min_uV > *max_uV)
210 return -EINVAL;
211
212 return 0;
213}
214
414c70cb
LG		 215/* current constraint check */
216static int regulator_check_current_limit(struct regulator_dev *rdev,
217 int *min_uA, int *max_uA)
218{
219 BUG_ON(*min_uA > *max_uA);
220
221 if (!rdev->constraints) {
5da84fd9 222 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 223 return -ENODEV;
224 }
225 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
5da84fd9 226 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 227 return -EPERM;
228 }
229
230 if (*max_uA > rdev->constraints->max_uA)
231 *max_uA = rdev->constraints->max_uA;
232 if (*min_uA < rdev->constraints->min_uA)
233 *min_uA = rdev->constraints->min_uA;
234
89f425ed
MB		 235 if (*min_uA > *max_uA) {
236 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 237 *min_uA, *max_uA);
414c70cb 238 return -EINVAL;
89f425ed 239 }
414c70cb
LG		 240
241 return 0;
242}
243
244/* operating mode constraint check */
2c608234 245static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 246{
2c608234 247 switch (*mode) {
e573520b
DB		 248 case REGULATOR_MODE_FAST:
249 case REGULATOR_MODE_NORMAL:
250 case REGULATOR_MODE_IDLE:
251 case REGULATOR_MODE_STANDBY:
252 break;
253 default:
89f425ed 254 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 255 return -EINVAL;
256 }
257
414c70cb 258 if (!rdev->constraints) {
5da84fd9 259 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 260 return -ENODEV;
261 }
262 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
5da84fd9 263 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 264 return -EPERM;
265 }
2c608234
MB		 266
267 /* The modes are bitmasks, the most power hungry modes having
268 * the lowest values. If the requested mode isn't supported
269 * try higher modes. */
270 while (*mode) {
271 if (rdev->constraints->valid_modes_mask & *mode)
272 return 0;
273 *mode /= 2;
414c70cb 274 }
2c608234
MB		 275
276 return -EINVAL;
414c70cb
LG		 277}
278
279/* dynamic regulator mode switching constraint check */
280static int regulator_check_drms(struct regulator_dev *rdev)
281{
282 if (!rdev->constraints) {
5da84fd9 283 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 284 return -ENODEV;
285 }
286 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
5da84fd9 287 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 288 return -EPERM;
289 }
290 return 0;
291}
292
293static ssize_t device_requested_uA_show(struct device *dev,
294 struct device_attribute *attr, char *buf)
295{
296 struct regulator *regulator;
297
298 regulator = get_device_regulator(dev);
299 if (regulator == NULL)
300 return 0;
301
302 return sprintf(buf, "%d\n", regulator->uA_load);
303}
304
305static ssize_t regulator_uV_show(struct device *dev,
306 struct device_attribute *attr, char *buf)
307{
a5766f11 308 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 309 ssize_t ret;
310
311 mutex_lock(&rdev->mutex);
312 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
313 mutex_unlock(&rdev->mutex);
314
315 return ret;
316}
7ad68e2f 317static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 318
319static ssize_t regulator_uA_show(struct device *dev,
320 struct device_attribute *attr, char *buf)
321{
a5766f11 322 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 323
324 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
325}
7ad68e2f 326static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 327
bc558a60
MB		 328static ssize_t regulator_name_show(struct device *dev,
329 struct device_attribute *attr, char *buf)
330{
331 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 332
1083c393 333 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60
MB		 334}
335
4fca9545 336static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 337{
414c70cb
LG		 338 switch (mode) {
339 case REGULATOR_MODE_FAST:
340 return sprintf(buf, "fast\n");
341 case REGULATOR_MODE_NORMAL:
342 return sprintf(buf, "normal\n");
343 case REGULATOR_MODE_IDLE:
344 return sprintf(buf, "idle\n");
345 case REGULATOR_MODE_STANDBY:
346 return sprintf(buf, "standby\n");
347 }
348 return sprintf(buf, "unknown\n");
349}
350
4fca9545
DB		 351static ssize_t regulator_opmode_show(struct device *dev,
352 struct device_attribute *attr, char *buf)
414c70cb 353{
a5766f11 354 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 355
4fca9545
DB		 356 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
357}
7ad68e2f 358static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 359
360static ssize_t regulator_print_state(char *buf, int state)
361{
414c70cb
LG		 362 if (state > 0)
363 return sprintf(buf, "enabled\n");
364 else if (state == 0)
365 return sprintf(buf, "disabled\n");
366 else
367 return sprintf(buf, "unknown\n");
368}
369
4fca9545
DB		 370static ssize_t regulator_state_show(struct device *dev,
371 struct device_attribute *attr, char *buf)
372{
373 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 374 ssize_t ret;
375
376 mutex_lock(&rdev->mutex);
377 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
378 mutex_unlock(&rdev->mutex);
4fca9545 379
9332546f 380 return ret;
4fca9545 381}
7ad68e2f 382static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 383
853116a1
DB		 384static ssize_t regulator_status_show(struct device *dev,
385 struct device_attribute *attr, char *buf)
386{
387 struct regulator_dev *rdev = dev_get_drvdata(dev);
388 int status;
389 char *label;
390
391 status = rdev->desc->ops->get_status(rdev);
392 if (status < 0)
393 return status;
394
395 switch (status) {
396 case REGULATOR_STATUS_OFF:
397 label = "off";
398 break;
399 case REGULATOR_STATUS_ON:
400 label = "on";
401 break;
402 case REGULATOR_STATUS_ERROR:
403 label = "error";
404 break;
405 case REGULATOR_STATUS_FAST:
406 label = "fast";
407 break;
408 case REGULATOR_STATUS_NORMAL:
409 label = "normal";
410 break;
411 case REGULATOR_STATUS_IDLE:
412 label = "idle";
413 break;
414 case REGULATOR_STATUS_STANDBY:
415 label = "standby";
416 break;
417 default:
418 return -ERANGE;
419 }
420
421 return sprintf(buf, "%s\n", label);
422}
423static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
424
414c70cb
LG		 425static ssize_t regulator_min_uA_show(struct device *dev,
426 struct device_attribute *attr, char *buf)
427{
a5766f11 428 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 429
430 if (!rdev->constraints)
431 return sprintf(buf, "constraint not defined\n");
432
433 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
434}
7ad68e2f 435static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 436
437static ssize_t regulator_max_uA_show(struct device *dev,
438 struct device_attribute *attr, char *buf)
439{
a5766f11 440 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 441
442 if (!rdev->constraints)
443 return sprintf(buf, "constraint not defined\n");
444
445 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
446}
7ad68e2f 447static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 448
449static ssize_t regulator_min_uV_show(struct device *dev,
450 struct device_attribute *attr, char *buf)
451{
a5766f11 452 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 453
454 if (!rdev->constraints)
455 return sprintf(buf, "constraint not defined\n");
456
457 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
458}
7ad68e2f 459static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 460
461static ssize_t regulator_max_uV_show(struct device *dev,
462 struct device_attribute *attr, char *buf)
463{
a5766f11 464 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 465
466 if (!rdev->constraints)
467 return sprintf(buf, "constraint not defined\n");
468
469 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
470}
7ad68e2f 471static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 472
473static ssize_t regulator_total_uA_show(struct device *dev,
474 struct device_attribute *attr, char *buf)
475{
a5766f11 476 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 477 struct regulator *regulator;
478 int uA = 0;
479
480 mutex_lock(&rdev->mutex);
481 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 482 uA += regulator->uA_load;
414c70cb
LG		 483 mutex_unlock(&rdev->mutex);
484 return sprintf(buf, "%d\n", uA);
485}
7ad68e2f 486static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb
LG		 487
488static ssize_t regulator_num_users_show(struct device *dev,
489 struct device_attribute *attr, char *buf)
490{
a5766f11 491 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 492 return sprintf(buf, "%d\n", rdev->use_count);
493}
494
495static ssize_t regulator_type_show(struct device *dev,
496 struct device_attribute *attr, char *buf)
497{
a5766f11 498 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 499
500 switch (rdev->desc->type) {
501 case REGULATOR_VOLTAGE:
502 return sprintf(buf, "voltage\n");
503 case REGULATOR_CURRENT:
504 return sprintf(buf, "current\n");
505 }
506 return sprintf(buf, "unknown\n");
507}
508
509static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
510 struct device_attribute *attr, char *buf)
511{
a5766f11 512 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 513
414c70cb
LG		 514 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
515}
7ad68e2f
DB		 516static DEVICE_ATTR(suspend_mem_microvolts, 0444,
517 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 518
519static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
520 struct device_attribute *attr, char *buf)
521{
a5766f11 522 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 523
414c70cb
LG		 524 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
525}
7ad68e2f
DB		 526static DEVICE_ATTR(suspend_disk_microvolts, 0444,
527 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 528
529static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
530 struct device_attribute *attr, char *buf)
531{
a5766f11 532 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 533
414c70cb
LG		 534 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
535}
7ad68e2f
DB		 536static DEVICE_ATTR(suspend_standby_microvolts, 0444,
537 regulator_suspend_standby_uV_show, NULL);
414c70cb 538
414c70cb
LG		 539static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
540 struct device_attribute *attr, char *buf)
541{
a5766f11 542 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 543
4fca9545
DB		 544 return regulator_print_opmode(buf,
545 rdev->constraints->state_mem.mode);
414c70cb 546}
7ad68e2f
DB		 547static DEVICE_ATTR(suspend_mem_mode, 0444,
548 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 549
550static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
551 struct device_attribute *attr, char *buf)
552{
a5766f11 553 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 554
4fca9545
DB		 555 return regulator_print_opmode(buf,
556 rdev->constraints->state_disk.mode);
414c70cb 557}
7ad68e2f
DB		 558static DEVICE_ATTR(suspend_disk_mode, 0444,
559 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 560
561static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
562 struct device_attribute *attr, char *buf)
563{
a5766f11 564 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 565
4fca9545
DB		 566 return regulator_print_opmode(buf,
567 rdev->constraints->state_standby.mode);
414c70cb 568}
7ad68e2f
DB		 569static DEVICE_ATTR(suspend_standby_mode, 0444,
570 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 571
572static ssize_t regulator_suspend_mem_state_show(struct device *dev,
573 struct device_attribute *attr, char *buf)
574{
a5766f11 575 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 576
4fca9545
DB		 577 return regulator_print_state(buf,
578 rdev->constraints->state_mem.enabled);
414c70cb 579}
7ad68e2f
DB		 580static DEVICE_ATTR(suspend_mem_state, 0444,
581 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 582
583static ssize_t regulator_suspend_disk_state_show(struct device *dev,
584 struct device_attribute *attr, char *buf)
585{
a5766f11 586 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 587
4fca9545
DB		 588 return regulator_print_state(buf,
589 rdev->constraints->state_disk.enabled);
414c70cb 590}
7ad68e2f
DB		 591static DEVICE_ATTR(suspend_disk_state, 0444,
592 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 593
594static ssize_t regulator_suspend_standby_state_show(struct device *dev,
595 struct device_attribute *attr, char *buf)
596{
a5766f11 597 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 598
4fca9545
DB		 599 return regulator_print_state(buf,
600 rdev->constraints->state_standby.enabled);
414c70cb 601}
7ad68e2f
DB		 602static DEVICE_ATTR(suspend_standby_state, 0444,
603 regulator_suspend_standby_state_show, NULL);
604
bc558a60 605
7ad68e2f
DB		 606/*
607 * These are the only attributes are present for all regulators.
608 * Other attributes are a function of regulator functionality.
609 */
414c70cb 610static struct device_attribute regulator_dev_attrs[] = {
bc558a60 611 __ATTR(name, 0444, regulator_name_show, NULL),
414c70cb
LG		 612 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
613 __ATTR(type, 0444, regulator_type_show, NULL),
414c70cb
LG		 614 __ATTR_NULL,
615};
616
617static void regulator_dev_release(struct device *dev)
618{
a5766f11 619 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 620 kfree(rdev);
621}
622
623static struct class regulator_class = {
624 .name = "regulator",
625 .dev_release = regulator_dev_release,
626 .dev_attrs = regulator_dev_attrs,
627};
628
629/* Calculate the new optimum regulator operating mode based on the new total
630 * consumer load. All locks held by caller */
631static void drms_uA_update(struct regulator_dev *rdev)
632{
633 struct regulator *sibling;
634 int current_uA = 0, output_uV, input_uV, err;
635 unsigned int mode;
636
637 err = regulator_check_drms(rdev);
638 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
476c2d83
MB		 639 (!rdev->desc->ops->get_voltage &&
640 !rdev->desc->ops->get_voltage_sel) ||
641 !rdev->desc->ops->set_mode)
036de8ef 642 return;
414c70cb
LG		 643
644 /* get output voltage */
1bf5a1f8 645 output_uV = _regulator_get_voltage(rdev);
414c70cb
LG		 646 if (output_uV <= 0)
647 return;
648
649 /* get input voltage */
1bf5a1f8
MB		 650 input_uV = 0;
651 if (rdev->supply)
652 input_uV = _regulator_get_voltage(rdev);
653 if (input_uV <= 0)
414c70cb
LG		 654 input_uV = rdev->constraints->input_uV;
655 if (input_uV <= 0)
656 return;
657
658 /* calc total requested load */
659 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 660 current_uA += sibling->uA_load;
414c70cb
LG		 661
662 /* now get the optimum mode for our new total regulator load */
663 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
664 output_uV, current_uA);
665
666 /* check the new mode is allowed */
2c608234 667 err = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 668 if (err == 0)
669 rdev->desc->ops->set_mode(rdev, mode);
670}
671
672static int suspend_set_state(struct regulator_dev *rdev,
673 struct regulator_state *rstate)
674{
675 int ret = 0;
638f85c5
MB		 676 bool can_set_state;
677
678 can_set_state = rdev->desc->ops->set_suspend_enable &&
679 rdev->desc->ops->set_suspend_disable;
680
681 /* If we have no suspend mode configration don't set anything;
682 * only warn if the driver actually makes the suspend mode
683 * configurable.
684 */
685 if (!rstate->enabled && !rstate->disabled) {
686 if (can_set_state)
5da84fd9 687 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 688 return 0;
689 }
690
691 if (rstate->enabled && rstate->disabled) {
5da84fd9 692 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 693 return -EINVAL;
694 }
414c70cb 695
638f85c5 696 if (!can_set_state) {
5da84fd9 697 rdev_err(rdev, "no way to set suspend state\n");
414c70cb 698 return -EINVAL;
a5766f11 699 }
414c70cb
LG		 700
701 if (rstate->enabled)
702 ret = rdev->desc->ops->set_suspend_enable(rdev);
703 else
704 ret = rdev->desc->ops->set_suspend_disable(rdev);
705 if (ret < 0) {
5da84fd9 706 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 707 return ret;
708 }
709
710 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
711 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
712 if (ret < 0) {
5da84fd9 713 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 714 return ret;
715 }
716 }
717
718 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
719 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
720 if (ret < 0) {
5da84fd9 721 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 722 return ret;
723 }
724 }
725 return ret;
726}
727
728/* locks held by caller */
729static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
730{
731 if (!rdev->constraints)
732 return -EINVAL;
733
734 switch (state) {
735 case PM_SUSPEND_STANDBY:
736 return suspend_set_state(rdev,
737 &rdev->constraints->state_standby);
738 case PM_SUSPEND_MEM:
739 return suspend_set_state(rdev,
740 &rdev->constraints->state_mem);
741 case PM_SUSPEND_MAX:
742 return suspend_set_state(rdev,
743 &rdev->constraints->state_disk);
744 default:
745 return -EINVAL;
746 }
747}
748
749static void print_constraints(struct regulator_dev *rdev)
750{
751 struct regulation_constraints *constraints = rdev->constraints;
973e9a27 752 char buf[80] = "";
8f031b48
MB		 753 int count = 0;
754 int ret;
414c70cb 755
8f031b48 756 if (constraints->min_uV && constraints->max_uV) {
414c70cb 757 if (constraints->min_uV == constraints->max_uV)
8f031b48
MB		 758 count += sprintf(buf + count, "%d mV ",
759 constraints->min_uV / 1000);
414c70cb 760 else
8f031b48
MB		 761 count += sprintf(buf + count, "%d <--> %d mV ",
762 constraints->min_uV / 1000,
763 constraints->max_uV / 1000);
764 }
765
766 if (!constraints->min_uV ||
767 constraints->min_uV != constraints->max_uV) {
768 ret = _regulator_get_voltage(rdev);
769 if (ret > 0)
770 count += sprintf(buf + count, "at %d mV ", ret / 1000);
771 }
772
bf5892a8
MB		 773 if (constraints->uV_offset)
774 count += sprintf(buf, "%dmV offset ",
775 constraints->uV_offset / 1000);
776
8f031b48 777 if (constraints->min_uA && constraints->max_uA) {
414c70cb 778 if (constraints->min_uA == constraints->max_uA)
8f031b48
MB		 779 count += sprintf(buf + count, "%d mA ",
780 constraints->min_uA / 1000);
414c70cb 781 else
8f031b48
MB		 782 count += sprintf(buf + count, "%d <--> %d mA ",
783 constraints->min_uA / 1000,
784 constraints->max_uA / 1000);
785 }
786
787 if (!constraints->min_uA ||
788 constraints->min_uA != constraints->max_uA) {
789 ret = _regulator_get_current_limit(rdev);
790 if (ret > 0)
e4a6376b 791 count += sprintf(buf + count, "at %d mA ", ret / 1000);
414c70cb 792 }
8f031b48 793
414c70cb
LG		 794 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
795 count += sprintf(buf + count, "fast ");
796 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
797 count += sprintf(buf + count, "normal ");
798 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
799 count += sprintf(buf + count, "idle ");
800 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
801 count += sprintf(buf + count, "standby");
802
13ce29f8 803 rdev_info(rdev, "%s\n", buf);
4a682922
MB		 804
805 if ((constraints->min_uV != constraints->max_uV) &&
806 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
807 rdev_warn(rdev,
808 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 809}
810
e79055d6 811static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 812 struct regulation_constraints *constraints)
a5766f11 813{
e5fda26c 814 struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 815 int ret;
816
817 /* do we need to apply the constraint voltage */
818 if (rdev->constraints->apply_uV &&
75790251
MB		 819 rdev->constraints->min_uV == rdev->constraints->max_uV) {
820 ret = _regulator_do_set_voltage(rdev,
821 rdev->constraints->min_uV,
822 rdev->constraints->max_uV);
823 if (ret < 0) {
824 rdev_err(rdev, "failed to apply %duV constraint\n",
825 rdev->constraints->min_uV);
75790251
MB		 826 return ret;
827 }
af5866c9 828 }
e06f5b4f 829
4367cfdc
DB		 830 /* constrain machine-level voltage specs to fit
831 * the actual range supported by this regulator.
832 */
833 if (ops->list_voltage && rdev->desc->n_voltages) {
834 int count = rdev->desc->n_voltages;
835 int i;
836 int min_uV = INT_MAX;
837 int max_uV = INT_MIN;
838 int cmin = constraints->min_uV;
839 int cmax = constraints->max_uV;
840
3e590918
MB		 841 /* it's safe to autoconfigure fixed-voltage supplies
842 and the constraints are used by list_voltage. */
4367cfdc 843 if (count == 1 && !cmin) {
3e590918 844 cmin = 1;
4367cfdc 845 cmax = INT_MAX;
3e590918
MB		 846 constraints->min_uV = cmin;
847 constraints->max_uV = cmax;
4367cfdc
DB		 848 }
849
3e2b9abd
MB		 850 /* voltage constraints are optional */
851 if ((cmin == 0) && (cmax == 0))
e79055d6 852 return 0;
3e2b9abd 853
4367cfdc 854 /* else require explicit machine-level constraints */
3e2b9abd 855 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 856 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 857 return -EINVAL;
4367cfdc
DB		 858 }
859
860 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
861 for (i = 0; i < count; i++) {
862 int value;
863
864 value = ops->list_voltage(rdev, i);
865 if (value <= 0)
866 continue;
867
868 /* maybe adjust [min_uV..max_uV] */
869 if (value >= cmin && value < min_uV)
870 min_uV = value;
871 if (value <= cmax && value > max_uV)
872 max_uV = value;
873 }
874
875 /* final: [min_uV..max_uV] valid iff constraints valid */
876 if (max_uV < min_uV) {
5da84fd9 877 rdev_err(rdev, "unsupportable voltage constraints\n");
e79055d6 878 return -EINVAL;
4367cfdc
DB		 879 }
880
881 /* use regulator's subset of machine constraints */
882 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 883 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
884 constraints->min_uV, min_uV);
4367cfdc
DB		 885 constraints->min_uV = min_uV;
886 }
887 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 888 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
889 constraints->max_uV, max_uV);
4367cfdc
DB		 890 constraints->max_uV = max_uV;
891 }
892 }
893
e79055d6
MB		 894 return 0;
895}
896
897/**
898 * set_machine_constraints - sets regulator constraints
899 * @rdev: regulator source
900 * @constraints: constraints to apply
901 *
902 * Allows platform initialisation code to define and constrain
903 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
904 * Constraints *must* be set by platform code in order for some
905 * regulator operations to proceed i.e. set_voltage, set_current_limit,
906 * set_mode.
907 */
908static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 909 const struct regulation_constraints *constraints)
e79055d6
MB		 910{
911 int ret = 0;
e79055d6
MB		 912 struct regulator_ops *ops = rdev->desc->ops;
913
9a8f5e07
MB		 914 if (constraints)
915 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
916 GFP_KERNEL);
917 else
918 rdev->constraints = kzalloc(sizeof(*constraints),
919 GFP_KERNEL);
f8c12fe3
MB		 920 if (!rdev->constraints)
921 return -ENOMEM;
af5866c9 922
f8c12fe3 923 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6
MB		 924 if (ret != 0)
925 goto out;
926
a5766f11 927 /* do we need to setup our suspend state */
9a8f5e07 928 if (rdev->constraints->initial_state) {
f8c12fe3 929 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 930 if (ret < 0) {
5da84fd9 931 rdev_err(rdev, "failed to set suspend state\n");
e06f5b4f
MB		 932 goto out;
933 }
934 }
a5766f11 935
9a8f5e07 936 if (rdev->constraints->initial_mode) {
a308466c 937 if (!ops->set_mode) {
5da84fd9 938 rdev_err(rdev, "no set_mode operation\n");
a308466c
MB		 939 ret = -EINVAL;
940 goto out;
941 }
942
f8c12fe3 943 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 944 if (ret < 0) {
5da84fd9 945 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
a308466c
MB		 946 goto out;
947 }
948 }
949
cacf90f2
MB		 950 /* If the constraints say the regulator should be on at this point
951 * and we have control then make sure it is enabled.
952 */
f8c12fe3
MB		 953 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
954 ops->enable) {
e5fda26c
MB		 955 ret = ops->enable(rdev);
956 if (ret < 0) {
5da84fd9 957 rdev_err(rdev, "failed to enable\n");
e5fda26c
MB		 958 goto out;
959 }
960 }
961
a5766f11 962 print_constraints(rdev);
1a6958e7 963 return 0;
a5766f11 964out:
1a6958e7
AL		 965 kfree(rdev->constraints);
966 rdev->constraints = NULL;
a5766f11
LG		 967 return ret;
968}
969
970/**
971 * set_supply - set regulator supply regulator
69279fb9
MB		 972 * @rdev: regulator name
973 * @supply_rdev: supply regulator name
a5766f11
LG		 974 *
975 * Called by platform initialisation code to set the supply regulator for this
976 * regulator. This ensures that a regulators supply will also be enabled by the
977 * core if it's child is enabled.
978 */
979static int set_supply(struct regulator_dev *rdev,
3801b86a 980 struct regulator_dev *supply_rdev)
a5766f11
LG		 981{
982 int err;
983
3801b86a
MB		 984 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
985
986 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 987 if (rdev->supply == NULL) {
988 err = -ENOMEM;
3801b86a 989 return err;
a5766f11 990 }
3801b86a
MB		 991
992 return 0;
a5766f11
LG		 993}
994
995/**
06c63f93 996 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 997 * @rdev: regulator source
40f9244f 998 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 999 * @supply: symbolic name for supply
a5766f11
LG		 1000 *
1001 * Allows platform initialisation code to map physical regulator
1002 * sources to symbolic names for supplies for use by devices. Devices
1003 * should use these symbolic names to request regulators, avoiding the
1004 * need to provide board-specific regulator names as platform data.
1005 */
1006static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 1007 const char *consumer_dev_name,
1008 const char *supply)
a5766f11
LG		 1009{
1010 struct regulator_map *node;
9ed2099e 1011 int has_dev;
a5766f11
LG		 1012
1013 if (supply == NULL)
1014 return -EINVAL;
1015
9ed2099e
MB		 1016 if (consumer_dev_name != NULL)
1017 has_dev = 1;
1018 else
1019 has_dev = 0;
1020
6001e13c 1021 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1022 if (node->dev_name && consumer_dev_name) {
1023 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1024 continue;
1025 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1026 continue;
23b5cc2a
JN		 1027 }
1028
6001e13c
DB		 1029 if (strcmp(node->supply, supply) != 0)
1030 continue;
1031
737f360d
MB		 1032 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1033 consumer_dev_name,
1034 dev_name(&node->regulator->dev),
1035 node->regulator->desc->name,
1036 supply,
1037 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 1038 return -EBUSY;
1039 }
1040
9ed2099e 1041 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 1042 if (node == NULL)
1043 return -ENOMEM;
1044
1045 node->regulator = rdev;
a5766f11
LG		 1046 node->supply = supply;
1047
9ed2099e
MB		 1048 if (has_dev) {
1049 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1050 if (node->dev_name == NULL) {
1051 kfree(node);
1052 return -ENOMEM;
1053 }
40f9244f
MB		 1054 }
1055
a5766f11
LG		 1056 list_add(&node->list, &regulator_map_list);
1057 return 0;
1058}
1059
0f1d747b
MR		 1060static void unset_regulator_supplies(struct regulator_dev *rdev)
1061{
1062 struct regulator_map *node, *n;
1063
1064 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1065 if (rdev == node->regulator) {
1066 list_del(&node->list);
40f9244f 1067 kfree(node->dev_name);
0f1d747b 1068 kfree(node);
0f1d747b
MR		 1069 }
1070 }
1071}
1072
f5726ae3 1073#define REG_STR_SIZE 64
414c70cb
LG		 1074
1075static struct regulator *create_regulator(struct regulator_dev *rdev,
1076 struct device *dev,
1077 const char *supply_name)
1078{
1079 struct regulator *regulator;
1080 char buf[REG_STR_SIZE];
1081 int err, size;
1082
1083 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1084 if (regulator == NULL)
1085 return NULL;
1086
1087 mutex_lock(&rdev->mutex);
1088 regulator->rdev = rdev;
1089 list_add(&regulator->list, &rdev->consumer_list);
1090
1091 if (dev) {
1092 /* create a 'requested_microamps_name' sysfs entry */
e0eaedef
MB		 1093 size = scnprintf(buf, REG_STR_SIZE,
1094 "microamps_requested_%s-%s",
1095 dev_name(dev), supply_name);
414c70cb
LG		 1096 if (size >= REG_STR_SIZE)
1097 goto overflow_err;
1098
1099 regulator->dev = dev;
4f26a2ab 1100 sysfs_attr_init(&regulator->dev_attr.attr);
414c70cb
LG		 1101 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1102 if (regulator->dev_attr.attr.name == NULL)
1103 goto attr_name_err;
1104
414c70cb
LG		 1105 regulator->dev_attr.attr.mode = 0444;
1106 regulator->dev_attr.show = device_requested_uA_show;
1107 err = device_create_file(dev, &regulator->dev_attr);
1108 if (err < 0) {
5da84fd9 1109 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
414c70cb
LG		 1110 goto attr_name_err;
1111 }
1112
1113 /* also add a link to the device sysfs entry */
1114 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1115 dev->kobj.name, supply_name);
1116 if (size >= REG_STR_SIZE)
1117 goto attr_err;
1118
1119 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1120 if (regulator->supply_name == NULL)
1121 goto attr_err;
1122
1123 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1124 buf);
1125 if (err) {
5da84fd9
JP		 1126 rdev_warn(rdev, "could not add device link %s err %d\n",
1127 dev->kobj.name, err);
414c70cb
LG		 1128 goto link_name_err;
1129 }
5de70519
MB		 1130 } else {
1131 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1132 if (regulator->supply_name == NULL)
1133 goto attr_err;
1134 }
1135
5de70519
MB		 1136 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1137 rdev->debugfs);
24751434 1138 if (!regulator->debugfs) {
5de70519 1139 rdev_warn(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1140 } else {
1141 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1142 &regulator->uA_load);
1143 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1144 &regulator->min_uV);
1145 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1146 &regulator->max_uV);
414c70cb 1147 }
5de70519 1148
414c70cb
LG		 1149 mutex_unlock(&rdev->mutex);
1150 return regulator;
1151link_name_err:
1152 kfree(regulator->supply_name);
1153attr_err:
1154 device_remove_file(regulator->dev, &regulator->dev_attr);
1155attr_name_err:
1156 kfree(regulator->dev_attr.attr.name);
1157overflow_err:
1158 list_del(&regulator->list);
1159 kfree(regulator);
1160 mutex_unlock(&rdev->mutex);
1161 return NULL;
1162}
1163
31aae2be
MB		 1164static int _regulator_get_enable_time(struct regulator_dev *rdev)
1165{
1166 if (!rdev->desc->ops->enable_time)
1167 return 0;
1168 return rdev->desc->ops->enable_time(rdev);
1169}
1170
69511a45
RN		 1171static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1172 const char *supply)
1173{
1174 struct regulator_dev *r;
1175 struct device_node *node;
1176
1177 /* first do a dt based lookup */
1178 if (dev && dev->of_node) {
1179 node = of_get_regulator(dev, supply);
1180 if (node)
1181 list_for_each_entry(r, &regulator_list, list)
1182 if (r->dev.parent &&
1183 node == r->dev.of_node)
1184 return r;
1185 }
1186
1187 /* if not found, try doing it non-dt way */
1188 list_for_each_entry(r, &regulator_list, list)
1189 if (strcmp(rdev_get_name(r), supply) == 0)
1190 return r;
1191
1192 return NULL;
1193}
1194
5ffbd136
MB		 1195/* Internal regulator request function */
1196static struct regulator *_regulator_get(struct device *dev, const char *id,
1197 int exclusive)
414c70cb
LG		 1198{
1199 struct regulator_dev *rdev;
1200 struct regulator_map *map;
04bf3011 1201 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
40f9244f 1202 const char *devname = NULL;
5ffbd136 1203 int ret;
414c70cb
LG		 1204
1205 if (id == NULL) {
5da84fd9 1206 pr_err("get() with no identifier\n");
414c70cb
LG		 1207 return regulator;
1208 }
1209
40f9244f
MB		 1210 if (dev)
1211 devname = dev_name(dev);
1212
414c70cb
LG		 1213 mutex_lock(&regulator_list_mutex);
1214
69511a45
RN		 1215 rdev = regulator_dev_lookup(dev, id);
1216 if (rdev)
1217 goto found;
1218
414c70cb 1219 list_for_each_entry(map, &regulator_map_list, list) {
40f9244f
MB		 1220 /* If the mapping has a device set up it must match */
1221 if (map->dev_name &&
1222 (!devname || strcmp(map->dev_name, devname)))
1223 continue;
1224
1225 if (strcmp(map->supply, id) == 0) {
a5766f11 1226 rdev = map->regulator;
414c70cb 1227 goto found;
a5766f11 1228 }
414c70cb 1229 }
34abbd68 1230
688fe99a
MB		 1231 if (board_wants_dummy_regulator) {
1232 rdev = dummy_regulator_rdev;
1233 goto found;
1234 }
1235
34abbd68
MB		 1236#ifdef CONFIG_REGULATOR_DUMMY
1237 if (!devname)
1238 devname = "deviceless";
1239
1240 /* If the board didn't flag that it was fully constrained then
1241 * substitute in a dummy regulator so consumers can continue.
1242 */
1243 if (!has_full_constraints) {
5da84fd9
JP		 1244 pr_warn("%s supply %s not found, using dummy regulator\n",
1245 devname, id);
34abbd68
MB		 1246 rdev = dummy_regulator_rdev;
1247 goto found;
1248 }
1249#endif
1250
414c70cb
LG		 1251 mutex_unlock(&regulator_list_mutex);
1252 return regulator;
1253
1254found:
5ffbd136
MB		 1255 if (rdev->exclusive) {
1256 regulator = ERR_PTR(-EPERM);
1257 goto out;
1258 }
1259
1260 if (exclusive && rdev->open_count) {
1261 regulator = ERR_PTR(-EBUSY);
1262 goto out;
1263 }
1264
a5766f11
LG		 1265 if (!try_module_get(rdev->owner))
1266 goto out;
1267
414c70cb
LG		 1268 regulator = create_regulator(rdev, dev, id);
1269 if (regulator == NULL) {
1270 regulator = ERR_PTR(-ENOMEM);
1271 module_put(rdev->owner);
bcda4321 1272 goto out;
414c70cb
LG		 1273 }
1274
5ffbd136
MB		 1275 rdev->open_count++;
1276 if (exclusive) {
1277 rdev->exclusive = 1;
1278
1279 ret = _regulator_is_enabled(rdev);
1280 if (ret > 0)
1281 rdev->use_count = 1;
1282 else
1283 rdev->use_count = 0;
1284 }
1285
a5766f11 1286out:
414c70cb 1287 mutex_unlock(&regulator_list_mutex);
5ffbd136 1288
414c70cb
LG		 1289 return regulator;
1290}
5ffbd136
MB		 1291
1292/**
1293 * regulator_get - lookup and obtain a reference to a regulator.
1294 * @dev: device for regulator "consumer"
1295 * @id: Supply name or regulator ID.
1296 *
1297 * Returns a struct regulator corresponding to the regulator producer,
1298 * or IS_ERR() condition containing errno.
1299 *
1300 * Use of supply names configured via regulator_set_device_supply() is
1301 * strongly encouraged. It is recommended that the supply name used
1302 * should match the name used for the supply and/or the relevant
1303 * device pins in the datasheet.
1304 */
1305struct regulator *regulator_get(struct device *dev, const char *id)
1306{
1307 return _regulator_get(dev, id, 0);
1308}
414c70cb
LG		 1309EXPORT_SYMBOL_GPL(regulator_get);
1310
070b9079
SB		 1311static void devm_regulator_release(struct device *dev, void *res)
1312{
1313 regulator_put(*(struct regulator **)res);
1314}
1315
1316/**
1317 * devm_regulator_get - Resource managed regulator_get()
1318 * @dev: device for regulator "consumer"
1319 * @id: Supply name or regulator ID.
1320 *
1321 * Managed regulator_get(). Regulators returned from this function are
1322 * automatically regulator_put() on driver detach. See regulator_get() for more
1323 * information.
1324 */
1325struct regulator *devm_regulator_get(struct device *dev, const char *id)
1326{
1327 struct regulator **ptr, *regulator;
1328
1329 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1330 if (!ptr)
1331 return ERR_PTR(-ENOMEM);
1332
1333 regulator = regulator_get(dev, id);
1334 if (!IS_ERR(regulator)) {
1335 *ptr = regulator;
1336 devres_add(dev, ptr);
1337 } else {
1338 devres_free(ptr);
1339 }
1340
1341 return regulator;
1342}
1343EXPORT_SYMBOL_GPL(devm_regulator_get);
1344
5ffbd136
MB		 1345/**
1346 * regulator_get_exclusive - obtain exclusive access to a regulator.
1347 * @dev: device for regulator "consumer"
1348 * @id: Supply name or regulator ID.
1349 *
1350 * Returns a struct regulator corresponding to the regulator producer,
1351 * or IS_ERR() condition containing errno. Other consumers will be
1352 * unable to obtain this reference is held and the use count for the
1353 * regulator will be initialised to reflect the current state of the
1354 * regulator.
1355 *
1356 * This is intended for use by consumers which cannot tolerate shared
1357 * use of the regulator such as those which need to force the
1358 * regulator off for correct operation of the hardware they are
1359 * controlling.
1360 *
1361 * Use of supply names configured via regulator_set_device_supply() is
1362 * strongly encouraged. It is recommended that the supply name used
1363 * should match the name used for the supply and/or the relevant
1364 * device pins in the datasheet.
1365 */
1366struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1367{
1368 return _regulator_get(dev, id, 1);
1369}
1370EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1371
414c70cb
LG		 1372/**
1373 * regulator_put - "free" the regulator source
1374 * @regulator: regulator source
1375 *
1376 * Note: drivers must ensure that all regulator_enable calls made on this
1377 * regulator source are balanced by regulator_disable calls prior to calling
1378 * this function.
1379 */
1380void regulator_put(struct regulator *regulator)
1381{
1382 struct regulator_dev *rdev;
1383
1384 if (regulator == NULL || IS_ERR(regulator))
1385 return;
1386
414c70cb
LG		 1387 mutex_lock(&regulator_list_mutex);
1388 rdev = regulator->rdev;
1389
5de70519 1390 debugfs_remove_recursive(regulator->debugfs);
5de70519 1391
414c70cb
LG		 1392 /* remove any sysfs entries */
1393 if (regulator->dev) {
1394 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
414c70cb
LG		 1395 device_remove_file(regulator->dev, &regulator->dev_attr);
1396 kfree(regulator->dev_attr.attr.name);
1397 }
5de70519 1398 kfree(regulator->supply_name);
414c70cb
LG		 1399 list_del(&regulator->list);
1400 kfree(regulator);
1401
5ffbd136
MB		 1402 rdev->open_count--;
1403 rdev->exclusive = 0;
1404
414c70cb
LG		 1405 module_put(rdev->owner);
1406 mutex_unlock(&regulator_list_mutex);
1407}
1408EXPORT_SYMBOL_GPL(regulator_put);
1409
d5ad34f7
MB		 1410static int devm_regulator_match(struct device *dev, void *res, void *data)
1411{
1412 struct regulator **r = res;
1413 if (!r || !*r) {
1414 WARN_ON(!r || !*r);
1415 return 0;
1416 }
1417 return *r == data;
1418}
1419
1420/**
1421 * devm_regulator_put - Resource managed regulator_put()
1422 * @regulator: regulator to free
1423 *
1424 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1425 * this function will not need to be called and the resource management
1426 * code will ensure that the resource is freed.
1427 */
1428void devm_regulator_put(struct regulator *regulator)
1429{
1430 int rc;
1431
1432 rc = devres_destroy(regulator->dev, devm_regulator_release,
1433 devm_regulator_match, regulator);
1434 WARN_ON(rc);
1435}
1436EXPORT_SYMBOL_GPL(devm_regulator_put);
1437
9a2372fa
MB		 1438static int _regulator_can_change_status(struct regulator_dev *rdev)
1439{
1440 if (!rdev->constraints)
1441 return 0;
1442
1443 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
1444 return 1;
1445 else
1446 return 0;
1447}
1448
414c70cb
LG		 1449/* locks held by regulator_enable() */
1450static int _regulator_enable(struct regulator_dev *rdev)
1451{
31aae2be 1452 int ret, delay;
414c70cb 1453
414c70cb 1454 /* check voltage and requested load before enabling */
9a2372fa
MB		 1455 if (rdev->constraints &&
1456 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1457 drms_uA_update(rdev);
414c70cb 1458
9a2372fa
MB		 1459 if (rdev->use_count == 0) {
1460 /* The regulator may on if it's not switchable or left on */
1461 ret = _regulator_is_enabled(rdev);
1462 if (ret == -EINVAL || ret == 0) {
1463 if (!_regulator_can_change_status(rdev))
1464 return -EPERM;
1465
31aae2be 1466 if (!rdev->desc->ops->enable)
9a2372fa 1467 return -EINVAL;
31aae2be
MB		 1468
1469 /* Query before enabling in case configuration
25985edc 1470 * dependent. */
31aae2be
MB		 1471 ret = _regulator_get_enable_time(rdev);
1472 if (ret >= 0) {
1473 delay = ret;
1474 } else {
5da84fd9 1475 rdev_warn(rdev, "enable_time() failed: %d\n",
1d7372e1 1476 ret);
31aae2be 1477 delay = 0;
9a2372fa 1478 }
31aae2be 1479
02fa3ec0
MB		 1480 trace_regulator_enable(rdev_get_name(rdev));
1481
31aae2be
MB		 1482 /* Allow the regulator to ramp; it would be useful
1483 * to extend this for bulk operations so that the
1484 * regulators can ramp together. */
1485 ret = rdev->desc->ops->enable(rdev);
1486 if (ret < 0)
1487 return ret;
1488
02fa3ec0
MB		 1489 trace_regulator_enable_delay(rdev_get_name(rdev));
1490
e36c1df8 1491 if (delay >= 1000) {
31aae2be 1492 mdelay(delay / 1000);
e36c1df8
AL		 1493 udelay(delay % 1000);
1494 } else if (delay) {
31aae2be 1495 udelay(delay);
e36c1df8 1496 }
31aae2be 1497
02fa3ec0
MB		 1498 trace_regulator_enable_complete(rdev_get_name(rdev));
1499
a7433cff 1500 } else if (ret < 0) {
5da84fd9 1501 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 1502 return ret;
1503 }
a7433cff 1504 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 1505 }
1506
9a2372fa
MB		 1507 rdev->use_count++;
1508
1509 return 0;
414c70cb
LG		 1510}
1511
1512/**
1513 * regulator_enable - enable regulator output
1514 * @regulator: regulator source
1515 *
cf7bbcdf
MB		 1516 * Request that the regulator be enabled with the regulator output at
1517 * the predefined voltage or current value. Calls to regulator_enable()
1518 * must be balanced with calls to regulator_disable().
1519 *
414c70cb 1520 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 1521 * hardwired in the regulator.
414c70cb
LG		 1522 */
1523int regulator_enable(struct regulator *regulator)
1524{
412aec61
DB		 1525 struct regulator_dev *rdev = regulator->rdev;
1526 int ret = 0;
414c70cb 1527
3801b86a
MB		 1528 if (rdev->supply) {
1529 ret = regulator_enable(rdev->supply);
1530 if (ret != 0)
1531 return ret;
1532 }
1533
412aec61 1534 mutex_lock(&rdev->mutex);
cd94b505 1535 ret = _regulator_enable(rdev);
412aec61 1536 mutex_unlock(&rdev->mutex);
3801b86a 1537
d1685e4e 1538 if (ret != 0 && rdev->supply)
3801b86a
MB		 1539 regulator_disable(rdev->supply);
1540
414c70cb
LG		 1541 return ret;
1542}
1543EXPORT_SYMBOL_GPL(regulator_enable);
1544
1545/* locks held by regulator_disable() */
3801b86a 1546static int _regulator_disable(struct regulator_dev *rdev)
414c70cb
LG		 1547{
1548 int ret = 0;
1549
cd94b505 1550 if (WARN(rdev->use_count <= 0,
43e7ee33 1551 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 1552 return -EIO;
1553
414c70cb 1554 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 1555 if (rdev->use_count == 1 &&
1556 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 1557
1558 /* we are last user */
9a2372fa
MB		 1559 if (_regulator_can_change_status(rdev) &&
1560 rdev->desc->ops->disable) {
02fa3ec0
MB		 1561 trace_regulator_disable(rdev_get_name(rdev));
1562
414c70cb
LG		 1563 ret = rdev->desc->ops->disable(rdev);
1564 if (ret < 0) {
5da84fd9 1565 rdev_err(rdev, "failed to disable\n");
414c70cb
LG		 1566 return ret;
1567 }
84b68263 1568
02fa3ec0
MB		 1569 trace_regulator_disable_complete(rdev_get_name(rdev));
1570
84b68263
MB		 1571 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1572 NULL);
414c70cb
LG		 1573 }
1574
414c70cb
LG		 1575 rdev->use_count = 0;
1576 } else if (rdev->use_count > 1) {
1577
1578 if (rdev->constraints &&
1579 (rdev->constraints->valid_ops_mask &
1580 REGULATOR_CHANGE_DRMS))
1581 drms_uA_update(rdev);
1582
1583 rdev->use_count--;
1584 }
3801b86a 1585
414c70cb
LG		 1586 return ret;
1587}
1588
1589/**
1590 * regulator_disable - disable regulator output
1591 * @regulator: regulator source
1592 *
cf7bbcdf
MB		 1593 * Disable the regulator output voltage or current. Calls to
1594 * regulator_enable() must be balanced with calls to
1595 * regulator_disable().
69279fb9 1596 *
414c70cb 1597 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 1598 * devices have it enabled, the regulator device supports disabling and
1599 * machine constraints permit this operation.
414c70cb
LG		 1600 */
1601int regulator_disable(struct regulator *regulator)
1602{
412aec61
DB		 1603 struct regulator_dev *rdev = regulator->rdev;
1604 int ret = 0;
414c70cb 1605
412aec61 1606 mutex_lock(&rdev->mutex);
3801b86a 1607 ret = _regulator_disable(rdev);
412aec61 1608 mutex_unlock(&rdev->mutex);
8cbf811d 1609
3801b86a
MB		 1610 if (ret == 0 && rdev->supply)
1611 regulator_disable(rdev->supply);
8cbf811d 1612
414c70cb
LG		 1613 return ret;
1614}
1615EXPORT_SYMBOL_GPL(regulator_disable);
1616
1617/* locks held by regulator_force_disable() */
3801b86a 1618static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 1619{
1620 int ret = 0;
1621
1622 /* force disable */
1623 if (rdev->desc->ops->disable) {
1624 /* ah well, who wants to live forever... */
1625 ret = rdev->desc->ops->disable(rdev);
1626 if (ret < 0) {
5da84fd9 1627 rdev_err(rdev, "failed to force disable\n");
414c70cb
LG		 1628 return ret;
1629 }
1630 /* notify other consumers that power has been forced off */
84b68263
MB		 1631 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1632 REGULATOR_EVENT_DISABLE, NULL);
414c70cb
LG		 1633 }
1634
414c70cb
LG		 1635 return ret;
1636}
1637
1638/**
1639 * regulator_force_disable - force disable regulator output
1640 * @regulator: regulator source
1641 *
1642 * Forcibly disable the regulator output voltage or current.
1643 * NOTE: this *will* disable the regulator output even if other consumer
1644 * devices have it enabled. This should be used for situations when device
1645 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1646 */
1647int regulator_force_disable(struct regulator *regulator)
1648{
82d15839 1649 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 1650 int ret;
1651
82d15839 1652 mutex_lock(&rdev->mutex);
414c70cb 1653 regulator->uA_load = 0;
3801b86a 1654 ret = _regulator_force_disable(regulator->rdev);
82d15839 1655 mutex_unlock(&rdev->mutex);
8cbf811d 1656
3801b86a
MB		 1657 if (rdev->supply)
1658 while (rdev->open_count--)
1659 regulator_disable(rdev->supply);
8cbf811d 1660
414c70cb
LG		 1661 return ret;
1662}
1663EXPORT_SYMBOL_GPL(regulator_force_disable);
1664
da07ecd9
MB		 1665static void regulator_disable_work(struct work_struct *work)
1666{
1667 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1668 disable_work.work);
1669 int count, i, ret;
1670
1671 mutex_lock(&rdev->mutex);
1672
1673 BUG_ON(!rdev->deferred_disables);
1674
1675 count = rdev->deferred_disables;
1676 rdev->deferred_disables = 0;
1677
1678 for (i = 0; i < count; i++) {
1679 ret = _regulator_disable(rdev);
1680 if (ret != 0)
1681 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1682 }
1683
1684 mutex_unlock(&rdev->mutex);
1685
1686 if (rdev->supply) {
1687 for (i = 0; i < count; i++) {
1688 ret = regulator_disable(rdev->supply);
1689 if (ret != 0) {
1690 rdev_err(rdev,
1691 "Supply disable failed: %d\n", ret);
1692 }
1693 }
1694 }
1695}
1696
1697/**
1698 * regulator_disable_deferred - disable regulator output with delay
1699 * @regulator: regulator source
1700 * @ms: miliseconds until the regulator is disabled
1701 *
1702 * Execute regulator_disable() on the regulator after a delay. This
1703 * is intended for use with devices that require some time to quiesce.
1704 *
1705 * NOTE: this will only disable the regulator output if no other consumer
1706 * devices have it enabled, the regulator device supports disabling and
1707 * machine constraints permit this operation.
1708 */
1709int regulator_disable_deferred(struct regulator *regulator, int ms)
1710{
1711 struct regulator_dev *rdev = regulator->rdev;
aa59802d 1712 int ret;
da07ecd9
MB		 1713
1714 mutex_lock(&rdev->mutex);
1715 rdev->deferred_disables++;
1716 mutex_unlock(&rdev->mutex);
1717
aa59802d
MB		 1718 ret = schedule_delayed_work(&rdev->disable_work,
1719 msecs_to_jiffies(ms));
1720 if (ret < 0)
1721 return ret;
1722 else
1723 return 0;
da07ecd9
MB		 1724}
1725EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1726
414c70cb
LG		 1727static int _regulator_is_enabled(struct regulator_dev *rdev)
1728{
9a7f6a4c 1729 /* If we don't know then assume that the regulator is always on */
9332546f 1730 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 1731 return 1;
414c70cb 1732
9332546f 1733 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 1734}
1735
1736/**
1737 * regulator_is_enabled - is the regulator output enabled
1738 * @regulator: regulator source
1739 *
412aec61
DB		 1740 * Returns positive if the regulator driver backing the source/client
1741 * has requested that the device be enabled, zero if it hasn't, else a
1742 * negative errno code.
1743 *
1744 * Note that the device backing this regulator handle can have multiple
1745 * users, so it might be enabled even if regulator_enable() was never
1746 * called for this particular source.
414c70cb
LG		 1747 */
1748int regulator_is_enabled(struct regulator *regulator)
1749{
9332546f
MB		 1750 int ret;
1751
1752 mutex_lock(&regulator->rdev->mutex);
1753 ret = _regulator_is_enabled(regulator->rdev);
1754 mutex_unlock(&regulator->rdev->mutex);
1755
1756 return ret;
414c70cb
LG		 1757}
1758EXPORT_SYMBOL_GPL(regulator_is_enabled);
1759
4367cfdc
DB		 1760/**
1761 * regulator_count_voltages - count regulator_list_voltage() selectors
1762 * @regulator: regulator source
1763 *
1764 * Returns number of selectors, or negative errno. Selectors are
1765 * numbered starting at zero, and typically correspond to bitfields
1766 * in hardware registers.
1767 */
1768int regulator_count_voltages(struct regulator *regulator)
1769{
1770 struct regulator_dev *rdev = regulator->rdev;
1771
1772 return rdev->desc->n_voltages ? : -EINVAL;
1773}
1774EXPORT_SYMBOL_GPL(regulator_count_voltages);
1775
1776/**
1777 * regulator_list_voltage - enumerate supported voltages
1778 * @regulator: regulator source
1779 * @selector: identify voltage to list
1780 * Context: can sleep
1781 *
1782 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 1783 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 1784 * negative errno.
1785 */
1786int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1787{
1788 struct regulator_dev *rdev = regulator->rdev;
1789 struct regulator_ops *ops = rdev->desc->ops;
1790 int ret;
1791
1792 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1793 return -EINVAL;
1794
1795 mutex_lock(&rdev->mutex);
1796 ret = ops->list_voltage(rdev, selector);
1797 mutex_unlock(&rdev->mutex);
1798
1799 if (ret > 0) {
1800 if (ret < rdev->constraints->min_uV)
1801 ret = 0;
1802 else if (ret > rdev->constraints->max_uV)
1803 ret = 0;
1804 }
1805
1806 return ret;
1807}
1808EXPORT_SYMBOL_GPL(regulator_list_voltage);
1809
a7a1ad90
MB		 1810/**
1811 * regulator_is_supported_voltage - check if a voltage range can be supported
1812 *
1813 * @regulator: Regulator to check.
1814 * @min_uV: Minimum required voltage in uV.
1815 * @max_uV: Maximum required voltage in uV.
1816 *
1817 * Returns a boolean or a negative error code.
1818 */
1819int regulator_is_supported_voltage(struct regulator *regulator,
1820 int min_uV, int max_uV)
1821{
1822 int i, voltages, ret;
1823
1824 ret = regulator_count_voltages(regulator);
1825 if (ret < 0)
1826 return ret;
1827 voltages = ret;
1828
1829 for (i = 0; i < voltages; i++) {
1830 ret = regulator_list_voltage(regulator, i);
1831
1832 if (ret >= min_uV && ret <= max_uV)
1833 return 1;
1834 }
1835
1836 return 0;
1837}
a398eaa2 1838EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 1839
75790251
MB		 1840static int _regulator_do_set_voltage(struct regulator_dev *rdev,
1841 int min_uV, int max_uV)
1842{
1843 int ret;
77af1b26 1844 int delay = 0;
75790251
MB		 1845 unsigned int selector;
1846
1847 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
1848
bf5892a8
MB		 1849 min_uV += rdev->constraints->uV_offset;
1850 max_uV += rdev->constraints->uV_offset;
1851
75790251
MB		 1852 if (rdev->desc->ops->set_voltage) {
1853 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
1854 &selector);
1855
1856 if (rdev->desc->ops->list_voltage)
1857 selector = rdev->desc->ops->list_voltage(rdev,
1858 selector);
1859 else
1860 selector = -1;
e8eef82b
MB		 1861 } else if (rdev->desc->ops->set_voltage_sel) {
1862 int best_val = INT_MAX;
1863 int i;
1864
1865 selector = 0;
1866
1867 /* Find the smallest voltage that falls within the specified
1868 * range.
1869 */
1870 for (i = 0; i < rdev->desc->n_voltages; i++) {
1871 ret = rdev->desc->ops->list_voltage(rdev, i);
1872 if (ret < 0)
1873 continue;
1874
1875 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
1876 best_val = ret;
1877 selector = i;
1878 }
1879 }
1880
77af1b26
LW		 1881 /*
1882 * If we can't obtain the old selector there is not enough
1883 * info to call set_voltage_time_sel().
1884 */
1885 if (rdev->desc->ops->set_voltage_time_sel &&
1886 rdev->desc->ops->get_voltage_sel) {
1887 unsigned int old_selector = 0;
1888
1889 ret = rdev->desc->ops->get_voltage_sel(rdev);
1890 if (ret < 0)
1891 return ret;
1892 old_selector = ret;
07351233 1893 ret = rdev->desc->ops->set_voltage_time_sel(rdev,
77af1b26 1894 old_selector, selector);
07351233
AL		 1895 if (ret < 0)
1896 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", ret);
1897 else
1898 delay = ret;
77af1b26
LW		 1899 }
1900
e8eef82b
MB		 1901 if (best_val != INT_MAX) {
1902 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
1903 selector = best_val;
1904 } else {
1905 ret = -EINVAL;
1906 }
75790251
MB		 1907 } else {
1908 ret = -EINVAL;
1909 }
1910
77af1b26
LW		 1911 /* Insert any necessary delays */
1912 if (delay >= 1000) {
1913 mdelay(delay / 1000);
1914 udelay(delay % 1000);
1915 } else if (delay) {
1916 udelay(delay);
1917 }
1918
ded06a52
MB		 1919 if (ret == 0)
1920 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
1921 NULL);
1922
75790251
MB		 1923 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector);
1924
1925 return ret;
1926}
1927
414c70cb
LG		 1928/**
1929 * regulator_set_voltage - set regulator output voltage
1930 * @regulator: regulator source
1931 * @min_uV: Minimum required voltage in uV
1932 * @max_uV: Maximum acceptable voltage in uV
1933 *
1934 * Sets a voltage regulator to the desired output voltage. This can be set
1935 * during any regulator state. IOW, regulator can be disabled or enabled.
1936 *
1937 * If the regulator is enabled then the voltage will change to the new value
1938 * immediately otherwise if the regulator is disabled the regulator will
1939 * output at the new voltage when enabled.
1940 *
1941 * NOTE: If the regulator is shared between several devices then the lowest
1942 * request voltage that meets the system constraints will be used.
69279fb9 1943 * Regulator system constraints must be set for this regulator before
414c70cb
LG		 1944 * calling this function otherwise this call will fail.
1945 */
1946int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1947{
1948 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 1949 int ret = 0;
414c70cb
LG		 1950
1951 mutex_lock(&rdev->mutex);
1952
95a3c23a
MB		 1953 /* If we're setting the same range as last time the change
1954 * should be a noop (some cpufreq implementations use the same
1955 * voltage for multiple frequencies, for example).
1956 */
1957 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
1958 goto out;
1959
414c70cb 1960 /* sanity check */
e8eef82b
MB		 1961 if (!rdev->desc->ops->set_voltage &&
1962 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 1963 ret = -EINVAL;
1964 goto out;
1965 }
1966
1967 /* constraints check */
1968 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1969 if (ret < 0)
1970 goto out;
1971 regulator->min_uV = min_uV;
1972 regulator->max_uV = max_uV;
3a93f2a9 1973
05fda3b1
TP		 1974 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
1975 if (ret < 0)
1976 goto out;
1977
75790251 1978 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
02fa3ec0 1979
414c70cb
LG		 1980out:
1981 mutex_unlock(&rdev->mutex);
1982 return ret;
1983}
1984EXPORT_SYMBOL_GPL(regulator_set_voltage);
1985
88cd222b
LW		 1986/**
1987 * regulator_set_voltage_time - get raise/fall time
1988 * @regulator: regulator source
1989 * @old_uV: starting voltage in microvolts
1990 * @new_uV: target voltage in microvolts
1991 *
1992 * Provided with the starting and ending voltage, this function attempts to
1993 * calculate the time in microseconds required to rise or fall to this new
1994 * voltage.
1995 */
1996int regulator_set_voltage_time(struct regulator *regulator,
1997 int old_uV, int new_uV)
1998{
1999 struct regulator_dev *rdev = regulator->rdev;
2000 struct regulator_ops *ops = rdev->desc->ops;
2001 int old_sel = -1;
2002 int new_sel = -1;
2003 int voltage;
2004 int i;
2005
2006 /* Currently requires operations to do this */
2007 if (!ops->list_voltage || !ops->set_voltage_time_sel
2008 || !rdev->desc->n_voltages)
2009 return -EINVAL;
2010
2011 for (i = 0; i < rdev->desc->n_voltages; i++) {
2012 /* We only look for exact voltage matches here */
2013 voltage = regulator_list_voltage(regulator, i);
2014 if (voltage < 0)
2015 return -EINVAL;
2016 if (voltage == 0)
2017 continue;
2018 if (voltage == old_uV)
2019 old_sel = i;
2020 if (voltage == new_uV)
2021 new_sel = i;
2022 }
2023
2024 if (old_sel < 0 || new_sel < 0)
2025 return -EINVAL;
2026
2027 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2028}
2029EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2030
606a2562
MB		 2031/**
2032 * regulator_sync_voltage - re-apply last regulator output voltage
2033 * @regulator: regulator source
2034 *
2035 * Re-apply the last configured voltage. This is intended to be used
2036 * where some external control source the consumer is cooperating with
2037 * has caused the configured voltage to change.
2038 */
2039int regulator_sync_voltage(struct regulator *regulator)
2040{
2041 struct regulator_dev *rdev = regulator->rdev;
2042 int ret, min_uV, max_uV;
2043
2044 mutex_lock(&rdev->mutex);
2045
2046 if (!rdev->desc->ops->set_voltage &&
2047 !rdev->desc->ops->set_voltage_sel) {
2048 ret = -EINVAL;
2049 goto out;
2050 }
2051
2052 /* This is only going to work if we've had a voltage configured. */
2053 if (!regulator->min_uV && !regulator->max_uV) {
2054 ret = -EINVAL;
2055 goto out;
2056 }
2057
2058 min_uV = regulator->min_uV;
2059 max_uV = regulator->max_uV;
2060
2061 /* This should be a paranoia check... */
2062 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2063 if (ret < 0)
2064 goto out;
2065
2066 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2067 if (ret < 0)
2068 goto out;
2069
2070 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2071
2072out:
2073 mutex_unlock(&rdev->mutex);
2074 return ret;
2075}
2076EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2077
414c70cb
LG		 2078static int _regulator_get_voltage(struct regulator_dev *rdev)
2079{
bf5892a8 2080 int sel, ret;
476c2d83
MB		 2081
2082 if (rdev->desc->ops->get_voltage_sel) {
2083 sel = rdev->desc->ops->get_voltage_sel(rdev);
2084 if (sel < 0)
2085 return sel;
bf5892a8 2086 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 2087 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 2088 ret = rdev->desc->ops->get_voltage(rdev);
cb220d16 2089 } else {
414c70cb 2090 return -EINVAL;
cb220d16 2091 }
bf5892a8 2092
cb220d16
AL		 2093 if (ret < 0)
2094 return ret;
bf5892a8 2095 return ret - rdev->constraints->uV_offset;
414c70cb
LG		 2096}
2097
2098/**
2099 * regulator_get_voltage - get regulator output voltage
2100 * @regulator: regulator source
2101 *
2102 * This returns the current regulator voltage in uV.
2103 *
2104 * NOTE: If the regulator is disabled it will return the voltage value. This
2105 * function should not be used to determine regulator state.
2106 */
2107int regulator_get_voltage(struct regulator *regulator)
2108{
2109 int ret;
2110
2111 mutex_lock(&regulator->rdev->mutex);
2112
2113 ret = _regulator_get_voltage(regulator->rdev);
2114
2115 mutex_unlock(&regulator->rdev->mutex);
2116
2117 return ret;
2118}
2119EXPORT_SYMBOL_GPL(regulator_get_voltage);
2120
2121/**
2122 * regulator_set_current_limit - set regulator output current limit
2123 * @regulator: regulator source
2124 * @min_uA: Minimuum supported current in uA
2125 * @max_uA: Maximum supported current in uA
2126 *
2127 * Sets current sink to the desired output current. This can be set during
2128 * any regulator state. IOW, regulator can be disabled or enabled.
2129 *
2130 * If the regulator is enabled then the current will change to the new value
2131 * immediately otherwise if the regulator is disabled the regulator will
2132 * output at the new current when enabled.
2133 *
2134 * NOTE: Regulator system constraints must be set for this regulator before
2135 * calling this function otherwise this call will fail.
2136 */
2137int regulator_set_current_limit(struct regulator *regulator,
2138 int min_uA, int max_uA)
2139{
2140 struct regulator_dev *rdev = regulator->rdev;
2141 int ret;
2142
2143 mutex_lock(&rdev->mutex);
2144
2145 /* sanity check */
2146 if (!rdev->desc->ops->set_current_limit) {
2147 ret = -EINVAL;
2148 goto out;
2149 }
2150
2151 /* constraints check */
2152 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2153 if (ret < 0)
2154 goto out;
2155
2156 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2157out:
2158 mutex_unlock(&rdev->mutex);
2159 return ret;
2160}
2161EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2162
2163static int _regulator_get_current_limit(struct regulator_dev *rdev)
2164{
2165 int ret;
2166
2167 mutex_lock(&rdev->mutex);
2168
2169 /* sanity check */
2170 if (!rdev->desc->ops->get_current_limit) {
2171 ret = -EINVAL;
2172 goto out;
2173 }
2174
2175 ret = rdev->desc->ops->get_current_limit(rdev);
2176out:
2177 mutex_unlock(&rdev->mutex);
2178 return ret;
2179}
2180
2181/**
2182 * regulator_get_current_limit - get regulator output current
2183 * @regulator: regulator source
2184 *
2185 * This returns the current supplied by the specified current sink in uA.
2186 *
2187 * NOTE: If the regulator is disabled it will return the current value. This
2188 * function should not be used to determine regulator state.
2189 */
2190int regulator_get_current_limit(struct regulator *regulator)
2191{
2192 return _regulator_get_current_limit(regulator->rdev);
2193}
2194EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2195
2196/**
2197 * regulator_set_mode - set regulator operating mode
2198 * @regulator: regulator source
2199 * @mode: operating mode - one of the REGULATOR_MODE constants
2200 *
2201 * Set regulator operating mode to increase regulator efficiency or improve
2202 * regulation performance.
2203 *
2204 * NOTE: Regulator system constraints must be set for this regulator before
2205 * calling this function otherwise this call will fail.
2206 */
2207int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2208{
2209 struct regulator_dev *rdev = regulator->rdev;
2210 int ret;
500b4ac9 2211 int regulator_curr_mode;
414c70cb
LG		 2212
2213 mutex_lock(&rdev->mutex);
2214
2215 /* sanity check */
2216 if (!rdev->desc->ops->set_mode) {
2217 ret = -EINVAL;
2218 goto out;
2219 }
2220
500b4ac9
SI		 2221 /* return if the same mode is requested */
2222 if (rdev->desc->ops->get_mode) {
2223 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2224 if (regulator_curr_mode == mode) {
2225 ret = 0;
2226 goto out;
2227 }
2228 }
2229
414c70cb 2230 /* constraints check */
22c51b47 2231 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 2232 if (ret < 0)
2233 goto out;
2234
2235 ret = rdev->desc->ops->set_mode(rdev, mode);
2236out:
2237 mutex_unlock(&rdev->mutex);
2238 return ret;
2239}
2240EXPORT_SYMBOL_GPL(regulator_set_mode);
2241
2242static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2243{
2244 int ret;
2245
2246 mutex_lock(&rdev->mutex);
2247
2248 /* sanity check */
2249 if (!rdev->desc->ops->get_mode) {
2250 ret = -EINVAL;
2251 goto out;
2252 }
2253
2254 ret = rdev->desc->ops->get_mode(rdev);
2255out:
2256 mutex_unlock(&rdev->mutex);
2257 return ret;
2258}
2259
2260/**
2261 * regulator_get_mode - get regulator operating mode
2262 * @regulator: regulator source
2263 *
2264 * Get the current regulator operating mode.
2265 */
2266unsigned int regulator_get_mode(struct regulator *regulator)
2267{
2268 return _regulator_get_mode(regulator->rdev);
2269}
2270EXPORT_SYMBOL_GPL(regulator_get_mode);
2271
2272/**
2273 * regulator_set_optimum_mode - set regulator optimum operating mode
2274 * @regulator: regulator source
2275 * @uA_load: load current
2276 *
2277 * Notifies the regulator core of a new device load. This is then used by
2278 * DRMS (if enabled by constraints) to set the most efficient regulator
2279 * operating mode for the new regulator loading.
2280 *
2281 * Consumer devices notify their supply regulator of the maximum power
2282 * they will require (can be taken from device datasheet in the power
2283 * consumption tables) when they change operational status and hence power
2284 * state. Examples of operational state changes that can affect power
2285 * consumption are :-
2286 *
2287 * o Device is opened / closed.
2288 * o Device I/O is about to begin or has just finished.
2289 * o Device is idling in between work.
2290 *
2291 * This information is also exported via sysfs to userspace.
2292 *
2293 * DRMS will sum the total requested load on the regulator and change
2294 * to the most efficient operating mode if platform constraints allow.
2295 *
2296 * Returns the new regulator mode or error.
2297 */
2298int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2299{
2300 struct regulator_dev *rdev = regulator->rdev;
2301 struct regulator *consumer;
2302 int ret, output_uV, input_uV, total_uA_load = 0;
2303 unsigned int mode;
2304
2305 mutex_lock(&rdev->mutex);
2306
a4b41483
MB		 2307 /*
2308 * first check to see if we can set modes at all, otherwise just
2309 * tell the consumer everything is OK.
2310 */
414c70cb
LG		 2311 regulator->uA_load = uA_load;
2312 ret = regulator_check_drms(rdev);
a4b41483
MB		 2313 if (ret < 0) {
2314 ret = 0;
414c70cb 2315 goto out;
a4b41483 2316 }
414c70cb 2317
414c70cb
LG		 2318 if (!rdev->desc->ops->get_optimum_mode)
2319 goto out;
2320
a4b41483
MB		 2321 /*
2322 * we can actually do this so any errors are indicators of
2323 * potential real failure.
2324 */
2325 ret = -EINVAL;
2326
414c70cb 2327 /* get output voltage */
1bf5a1f8 2328 output_uV = _regulator_get_voltage(rdev);
414c70cb 2329 if (output_uV <= 0) {
5da84fd9 2330 rdev_err(rdev, "invalid output voltage found\n");
414c70cb
LG		 2331 goto out;
2332 }
2333
2334 /* get input voltage */
1bf5a1f8
MB		 2335 input_uV = 0;
2336 if (rdev->supply)
3801b86a 2337 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 2338 if (input_uV <= 0)
414c70cb
LG		 2339 input_uV = rdev->constraints->input_uV;
2340 if (input_uV <= 0) {
5da84fd9 2341 rdev_err(rdev, "invalid input voltage found\n");
414c70cb
LG		 2342 goto out;
2343 }
2344
2345 /* calc total requested load for this regulator */
2346 list_for_each_entry(consumer, &rdev->consumer_list, list)
fa2984d4 2347 total_uA_load += consumer->uA_load;
414c70cb
LG		 2348
2349 mode = rdev->desc->ops->get_optimum_mode(rdev,
2350 input_uV, output_uV,
2351 total_uA_load);
2c608234 2352 ret = regulator_mode_constrain(rdev, &mode);
e573520b 2353 if (ret < 0) {
5da84fd9
JP		 2354 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2355 total_uA_load, input_uV, output_uV);
414c70cb
LG		 2356 goto out;
2357 }
2358
2359 ret = rdev->desc->ops->set_mode(rdev, mode);
e573520b 2360 if (ret < 0) {
5da84fd9 2361 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
414c70cb
LG		 2362 goto out;
2363 }
2364 ret = mode;
2365out:
2366 mutex_unlock(&rdev->mutex);
2367 return ret;
2368}
2369EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2370
2371/**
2372 * regulator_register_notifier - register regulator event notifier
2373 * @regulator: regulator source
69279fb9 2374 * @nb: notifier block
414c70cb
LG		 2375 *
2376 * Register notifier block to receive regulator events.
2377 */
2378int regulator_register_notifier(struct regulator *regulator,
2379 struct notifier_block *nb)
2380{
2381 return blocking_notifier_chain_register(&regulator->rdev->notifier,
2382 nb);
2383}
2384EXPORT_SYMBOL_GPL(regulator_register_notifier);
2385
2386/**
2387 * regulator_unregister_notifier - unregister regulator event notifier
2388 * @regulator: regulator source
69279fb9 2389 * @nb: notifier block
414c70cb
LG		 2390 *
2391 * Unregister regulator event notifier block.
2392 */
2393int regulator_unregister_notifier(struct regulator *regulator,
2394 struct notifier_block *nb)
2395{
2396 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2397 nb);
2398}
2399EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2400
b136fb44
JC		 2401/* notify regulator consumers and downstream regulator consumers.
2402 * Note mutex must be held by caller.
2403 */
414c70cb
LG		 2404static void _notifier_call_chain(struct regulator_dev *rdev,
2405 unsigned long event, void *data)
2406{
414c70cb 2407 /* call rdev chain first */
414c70cb 2408 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
414c70cb
LG		 2409}
2410
2411/**
2412 * regulator_bulk_get - get multiple regulator consumers
2413 *
2414 * @dev: Device to supply
2415 * @num_consumers: Number of consumers to register
2416 * @consumers: Configuration of consumers; clients are stored here.
2417 *
2418 * @return 0 on success, an errno on failure.
2419 *
2420 * This helper function allows drivers to get several regulator
2421 * consumers in one operation. If any of the regulators cannot be
2422 * acquired then any regulators that were allocated will be freed
2423 * before returning to the caller.
2424 */
2425int regulator_bulk_get(struct device *dev, int num_consumers,
2426 struct regulator_bulk_data *consumers)
2427{
2428 int i;
2429 int ret;
2430
2431 for (i = 0; i < num_consumers; i++)
2432 consumers[i].consumer = NULL;
2433
2434 for (i = 0; i < num_consumers; i++) {
2435 consumers[i].consumer = regulator_get(dev,
2436 consumers[i].supply);
2437 if (IS_ERR(consumers[i].consumer)) {
414c70cb 2438 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 2439 dev_err(dev, "Failed to get supply '%s': %d\n",
2440 consumers[i].supply, ret);
414c70cb
LG		 2441 consumers[i].consumer = NULL;
2442 goto err;
2443 }
2444 }
2445
2446 return 0;
2447
2448err:
b29c7690 2449 while (--i >= 0)
414c70cb
LG		 2450 regulator_put(consumers[i].consumer);
2451
2452 return ret;
2453}
2454EXPORT_SYMBOL_GPL(regulator_bulk_get);
2455
e6e74030
MB		 2456/**
2457 * devm_regulator_bulk_get - managed get multiple regulator consumers
2458 *
2459 * @dev: Device to supply
2460 * @num_consumers: Number of consumers to register
2461 * @consumers: Configuration of consumers; clients are stored here.
2462 *
2463 * @return 0 on success, an errno on failure.
2464 *
2465 * This helper function allows drivers to get several regulator
2466 * consumers in one operation with management, the regulators will
2467 * automatically be freed when the device is unbound. If any of the
2468 * regulators cannot be acquired then any regulators that were
2469 * allocated will be freed before returning to the caller.
2470 */
2471int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2472 struct regulator_bulk_data *consumers)
2473{
2474 int i;
2475 int ret;
2476
2477 for (i = 0; i < num_consumers; i++)
2478 consumers[i].consumer = NULL;
2479
2480 for (i = 0; i < num_consumers; i++) {
2481 consumers[i].consumer = devm_regulator_get(dev,
2482 consumers[i].supply);
2483 if (IS_ERR(consumers[i].consumer)) {
2484 ret = PTR_ERR(consumers[i].consumer);
2485 dev_err(dev, "Failed to get supply '%s': %d\n",
2486 consumers[i].supply, ret);
2487 consumers[i].consumer = NULL;
2488 goto err;
2489 }
2490 }
2491
2492 return 0;
2493
2494err:
2495 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2496 devm_regulator_put(consumers[i].consumer);
2497
2498 return ret;
2499}
2500EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2501
f21e0e81
MB		 2502static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2503{
2504 struct regulator_bulk_data *bulk = data;
2505
2506 bulk->ret = regulator_enable(bulk->consumer);
2507}
2508
414c70cb
LG		 2509/**
2510 * regulator_bulk_enable - enable multiple regulator consumers
2511 *
2512 * @num_consumers: Number of consumers
2513 * @consumers: Consumer data; clients are stored here.
2514 * @return 0 on success, an errno on failure
2515 *
2516 * This convenience API allows consumers to enable multiple regulator
2517 * clients in a single API call. If any consumers cannot be enabled
2518 * then any others that were enabled will be disabled again prior to
2519 * return.
2520 */
2521int regulator_bulk_enable(int num_consumers,
2522 struct regulator_bulk_data *consumers)
2523{
f21e0e81 2524 LIST_HEAD(async_domain);
414c70cb 2525 int i;
f21e0e81 2526 int ret = 0;
414c70cb 2527
f21e0e81
MB		 2528 for (i = 0; i < num_consumers; i++)
2529 async_schedule_domain(regulator_bulk_enable_async,
2530 &consumers[i], &async_domain);
2531
2532 async_synchronize_full_domain(&async_domain);
2533
2534 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 2535 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 2536 if (consumers[i].ret != 0) {
2537 ret = consumers[i].ret;
414c70cb 2538 goto err;
f21e0e81 2539 }
414c70cb
LG		 2540 }
2541
2542 return 0;
2543
2544err:
b29c7690
AL		 2545 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2546 while (--i >= 0)
2547 regulator_disable(consumers[i].consumer);
414c70cb
LG		 2548
2549 return ret;
2550}
2551EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2552
2553/**
2554 * regulator_bulk_disable - disable multiple regulator consumers
2555 *
2556 * @num_consumers: Number of consumers
2557 * @consumers: Consumer data; clients are stored here.
2558 * @return 0 on success, an errno on failure
2559 *
2560 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 2561 * clients in a single API call. If any consumers cannot be disabled
2562 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 2563 * return.
2564 */
2565int regulator_bulk_disable(int num_consumers,
2566 struct regulator_bulk_data *consumers)
2567{
2568 int i;
2569 int ret;
2570
49e22632 2571 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 2572 ret = regulator_disable(consumers[i].consumer);
2573 if (ret != 0)
2574 goto err;
2575 }
2576
2577 return 0;
2578
2579err:
5da84fd9 2580 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
49e22632 2581 for (++i; i < num_consumers; ++i)
414c70cb
LG		 2582 regulator_enable(consumers[i].consumer);
2583
2584 return ret;
2585}
2586EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2587
e1de2f42
DK		 2588/**
2589 * regulator_bulk_force_disable - force disable multiple regulator consumers
2590 *
2591 * @num_consumers: Number of consumers
2592 * @consumers: Consumer data; clients are stored here.
2593 * @return 0 on success, an errno on failure
2594 *
2595 * This convenience API allows consumers to forcibly disable multiple regulator
2596 * clients in a single API call.
2597 * NOTE: This should be used for situations when device damage will
2598 * likely occur if the regulators are not disabled (e.g. over temp).
2599 * Although regulator_force_disable function call for some consumers can
2600 * return error numbers, the function is called for all consumers.
2601 */
2602int regulator_bulk_force_disable(int num_consumers,
2603 struct regulator_bulk_data *consumers)
2604{
2605 int i;
2606 int ret;
2607
2608 for (i = 0; i < num_consumers; i++)
2609 consumers[i].ret =
2610 regulator_force_disable(consumers[i].consumer);
2611
2612 for (i = 0; i < num_consumers; i++) {
2613 if (consumers[i].ret != 0) {
2614 ret = consumers[i].ret;
2615 goto out;
2616 }
2617 }
2618
2619 return 0;
2620out:
2621 return ret;
2622}
2623EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
2624
414c70cb
LG		 2625/**
2626 * regulator_bulk_free - free multiple regulator consumers
2627 *
2628 * @num_consumers: Number of consumers
2629 * @consumers: Consumer data; clients are stored here.
2630 *
2631 * This convenience API allows consumers to free multiple regulator
2632 * clients in a single API call.
2633 */
2634void regulator_bulk_free(int num_consumers,
2635 struct regulator_bulk_data *consumers)
2636{
2637 int i;
2638
2639 for (i = 0; i < num_consumers; i++) {
2640 regulator_put(consumers[i].consumer);
2641 consumers[i].consumer = NULL;
2642 }
2643}
2644EXPORT_SYMBOL_GPL(regulator_bulk_free);
2645
2646/**
2647 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 2648 * @rdev: regulator source
414c70cb 2649 * @event: notifier block
69279fb9 2650 * @data: callback-specific data.
414c70cb
LG		 2651 *
2652 * Called by regulator drivers to notify clients a regulator event has
2653 * occurred. We also notify regulator clients downstream.
b136fb44 2654 * Note lock must be held by caller.
414c70cb
LG		 2655 */
2656int regulator_notifier_call_chain(struct regulator_dev *rdev,
2657 unsigned long event, void *data)
2658{
2659 _notifier_call_chain(rdev, event, data);
2660 return NOTIFY_DONE;
2661
2662}
2663EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2664
be721979
MB		 2665/**
2666 * regulator_mode_to_status - convert a regulator mode into a status
2667 *
2668 * @mode: Mode to convert
2669 *
2670 * Convert a regulator mode into a status.
2671 */
2672int regulator_mode_to_status(unsigned int mode)
2673{
2674 switch (mode) {
2675 case REGULATOR_MODE_FAST:
2676 return REGULATOR_STATUS_FAST;
2677 case REGULATOR_MODE_NORMAL:
2678 return REGULATOR_STATUS_NORMAL;
2679 case REGULATOR_MODE_IDLE:
2680 return REGULATOR_STATUS_IDLE;
2681 case REGULATOR_STATUS_STANDBY:
2682 return REGULATOR_STATUS_STANDBY;
2683 default:
2684 return 0;
2685 }
2686}
2687EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2688
7ad68e2f
DB		 2689/*
2690 * To avoid cluttering sysfs (and memory) with useless state, only
2691 * create attributes that can be meaningfully displayed.
2692 */
2693static int add_regulator_attributes(struct regulator_dev *rdev)
2694{
2695 struct device *dev = &rdev->dev;
2696 struct regulator_ops *ops = rdev->desc->ops;
2697 int status = 0;
2698
2699 /* some attributes need specific methods to be displayed */
4c78899b
MB		 2700 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
2701 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
7ad68e2f
DB		 2702 status = device_create_file(dev, &dev_attr_microvolts);
2703 if (status < 0)
2704 return status;
2705 }
2706 if (ops->get_current_limit) {
2707 status = device_create_file(dev, &dev_attr_microamps);
2708 if (status < 0)
2709 return status;
2710 }
2711 if (ops->get_mode) {
2712 status = device_create_file(dev, &dev_attr_opmode);
2713 if (status < 0)
2714 return status;
2715 }
2716 if (ops->is_enabled) {
2717 status = device_create_file(dev, &dev_attr_state);
2718 if (status < 0)
2719 return status;
2720 }
853116a1
DB		 2721 if (ops->get_status) {
2722 status = device_create_file(dev, &dev_attr_status);
2723 if (status < 0)
2724 return status;
2725 }
7ad68e2f
DB		 2726
2727 /* some attributes are type-specific */
2728 if (rdev->desc->type == REGULATOR_CURRENT) {
2729 status = device_create_file(dev, &dev_attr_requested_microamps);
2730 if (status < 0)
2731 return status;
2732 }
2733
2734 /* all the other attributes exist to support constraints;
2735 * don't show them if there are no constraints, or if the
2736 * relevant supporting methods are missing.
2737 */
2738 if (!rdev->constraints)
2739 return status;
2740
2741 /* constraints need specific supporting methods */
e8eef82b 2742 if (ops->set_voltage || ops->set_voltage_sel) {
7ad68e2f
DB		 2743 status = device_create_file(dev, &dev_attr_min_microvolts);
2744 if (status < 0)
2745 return status;
2746 status = device_create_file(dev, &dev_attr_max_microvolts);
2747 if (status < 0)
2748 return status;
2749 }
2750 if (ops->set_current_limit) {
2751 status = device_create_file(dev, &dev_attr_min_microamps);
2752 if (status < 0)
2753 return status;
2754 status = device_create_file(dev, &dev_attr_max_microamps);
2755 if (status < 0)
2756 return status;
2757 }
2758
2759 /* suspend mode constraints need multiple supporting methods */
2760 if (!(ops->set_suspend_enable && ops->set_suspend_disable))
2761 return status;
2762
2763 status = device_create_file(dev, &dev_attr_suspend_standby_state);
2764 if (status < 0)
2765 return status;
2766 status = device_create_file(dev, &dev_attr_suspend_mem_state);
2767 if (status < 0)
2768 return status;
2769 status = device_create_file(dev, &dev_attr_suspend_disk_state);
2770 if (status < 0)
2771 return status;
2772
2773 if (ops->set_suspend_voltage) {
2774 status = device_create_file(dev,
2775 &dev_attr_suspend_standby_microvolts);
2776 if (status < 0)
2777 return status;
2778 status = device_create_file(dev,
2779 &dev_attr_suspend_mem_microvolts);
2780 if (status < 0)
2781 return status;
2782 status = device_create_file(dev,
2783 &dev_attr_suspend_disk_microvolts);
2784 if (status < 0)
2785 return status;
2786 }
2787
2788 if (ops->set_suspend_mode) {
2789 status = device_create_file(dev,
2790 &dev_attr_suspend_standby_mode);
2791 if (status < 0)
2792 return status;
2793 status = device_create_file(dev,
2794 &dev_attr_suspend_mem_mode);
2795 if (status < 0)
2796 return status;
2797 status = device_create_file(dev,
2798 &dev_attr_suspend_disk_mode);
2799 if (status < 0)
2800 return status;
2801 }
2802
2803 return status;
2804}
2805
1130e5b3
MB		 2806static void rdev_init_debugfs(struct regulator_dev *rdev)
2807{
1130e5b3 2808 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
24751434 2809 if (!rdev->debugfs) {
1130e5b3 2810 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 2811 return;
2812 }
2813
2814 debugfs_create_u32("use_count", 0444, rdev->debugfs,
2815 &rdev->use_count);
2816 debugfs_create_u32("open_count", 0444, rdev->debugfs,
2817 &rdev->open_count);
1130e5b3
MB		 2818}
2819
414c70cb
LG		 2820/**
2821 * regulator_register - register regulator
69279fb9 2822 * @regulator_desc: regulator to register
c172708d 2823 * @config: runtime configuration for regulator
414c70cb
LG		 2824 *
2825 * Called by regulator drivers to register a regulator.
2826 * Returns 0 on success.
2827 */
65f26846
MB		 2828struct regulator_dev *
2829regulator_register(const struct regulator_desc *regulator_desc,
c172708d 2830 const struct regulator_config *config)
414c70cb 2831{
9a8f5e07 2832 const struct regulation_constraints *constraints = NULL;
c172708d 2833 const struct regulator_init_data *init_data;
414c70cb
LG		 2834 static atomic_t regulator_no = ATOMIC_INIT(0);
2835 struct regulator_dev *rdev;
32c8fad4 2836 struct device *dev;
a5766f11 2837 int ret, i;
69511a45 2838 const char *supply = NULL;
414c70cb 2839
c172708d 2840 if (regulator_desc == NULL || config == NULL)
414c70cb
LG		 2841 return ERR_PTR(-EINVAL);
2842
32c8fad4
MB		 2843 dev = config->dev;
2844
414c70cb
LG		 2845 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2846 return ERR_PTR(-EINVAL);
2847
cd78dfc6
DL		 2848 if (regulator_desc->type != REGULATOR_VOLTAGE &&
2849 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 2850 return ERR_PTR(-EINVAL);
2851
476c2d83
MB		 2852 /* Only one of each should be implemented */
2853 WARN_ON(regulator_desc->ops->get_voltage &&
2854 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 2855 WARN_ON(regulator_desc->ops->set_voltage &&
2856 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 2857
2858 /* If we're using selectors we must implement list_voltage. */
2859 if (regulator_desc->ops->get_voltage_sel &&
2860 !regulator_desc->ops->list_voltage) {
2861 return ERR_PTR(-EINVAL);
2862 }
e8eef82b
MB		 2863 if (regulator_desc->ops->set_voltage_sel &&
2864 !regulator_desc->ops->list_voltage) {
2865 return ERR_PTR(-EINVAL);
2866 }
476c2d83 2867
c172708d
MB		 2868 init_data = config->init_data;
2869
414c70cb
LG		 2870 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2871 if (rdev == NULL)
2872 return ERR_PTR(-ENOMEM);
2873
2874 mutex_lock(&regulator_list_mutex);
2875
2876 mutex_init(&rdev->mutex);
c172708d 2877 rdev->reg_data = config->driver_data;
414c70cb
LG		 2878 rdev->owner = regulator_desc->owner;
2879 rdev->desc = regulator_desc;
2880 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 2881 INIT_LIST_HEAD(&rdev->list);
414c70cb 2882 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 2883 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 2884
a5766f11 2885 /* preform any regulator specific init */
9a8f5e07 2886 if (init_data && init_data->regulator_init) {
a5766f11 2887 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 2888 if (ret < 0)
2889 goto clean;
a5766f11
LG		 2890 }
2891
a5766f11 2892 /* register with sysfs */
414c70cb 2893 rdev->dev.class = &regulator_class;
c172708d 2894 rdev->dev.of_node = config->of_node;
a5766f11 2895 rdev->dev.parent = dev;
812460a9
KS		 2896 dev_set_name(&rdev->dev, "regulator.%d",
2897 atomic_inc_return(&regulator_no) - 1);
a5766f11 2898 ret = device_register(&rdev->dev);
ad7725cb
VK		 2899 if (ret != 0) {
2900 put_device(&rdev->dev);
4fca9545 2901 goto clean;
ad7725cb 2902 }
a5766f11
LG		 2903
2904 dev_set_drvdata(&rdev->dev, rdev);
2905
74f544c1 2906 /* set regulator constraints */
9a8f5e07
MB		 2907 if (init_data)
2908 constraints = &init_data->constraints;
2909
2910 ret = set_machine_constraints(rdev, constraints);
74f544c1
MR		 2911 if (ret < 0)
2912 goto scrub;
2913
7ad68e2f
DB		 2914 /* add attributes supported by this regulator */
2915 ret = add_regulator_attributes(rdev);
2916 if (ret < 0)
2917 goto scrub;
2918
9a8f5e07 2919 if (init_data && init_data->supply_regulator)
69511a45
RN		 2920 supply = init_data->supply_regulator;
2921 else if (regulator_desc->supply_name)
2922 supply = regulator_desc->supply_name;
2923
2924 if (supply) {
0178f3e2 2925 struct regulator_dev *r;
0178f3e2 2926
69511a45 2927 r = regulator_dev_lookup(dev, supply);
0178f3e2 2928
69511a45
RN		 2929 if (!r) {
2930 dev_err(dev, "Failed to find supply %s\n", supply);
04bf3011 2931 ret = -EPROBE_DEFER;
0178f3e2
MB		 2932 goto scrub;
2933 }
2934
2935 ret = set_supply(rdev, r);
2936 if (ret < 0)
2937 goto scrub;
b2296bd4
LD		 2938
2939 /* Enable supply if rail is enabled */
2940 if (rdev->desc->ops->is_enabled &&
2941 rdev->desc->ops->is_enabled(rdev)) {
2942 ret = regulator_enable(rdev->supply);
2943 if (ret < 0)
2944 goto scrub;
2945 }
0178f3e2
MB		 2946 }
2947
a5766f11 2948 /* add consumers devices */
9a8f5e07
MB		 2949 if (init_data) {
2950 for (i = 0; i < init_data->num_consumer_supplies; i++) {
2951 ret = set_consumer_device_supply(rdev,
9a8f5e07 2952 init_data->consumer_supplies[i].dev_name,
23c2f041 2953 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 2954 if (ret < 0) {
2955 dev_err(dev, "Failed to set supply %s\n",
2956 init_data->consumer_supplies[i].supply);
2957 goto unset_supplies;
2958 }
23c2f041 2959 }
414c70cb 2960 }
a5766f11
LG		 2961
2962 list_add(&rdev->list, &regulator_list);
1130e5b3
MB		 2963
2964 rdev_init_debugfs(rdev);
a5766f11 2965out:
414c70cb
LG		 2966 mutex_unlock(&regulator_list_mutex);
2967 return rdev;
4fca9545 2968
d4033b54
JN		 2969unset_supplies:
2970 unset_regulator_supplies(rdev);
2971
4fca9545 2972scrub:
1a6958e7 2973 kfree(rdev->constraints);
4fca9545 2974 device_unregister(&rdev->dev);
53032daf
PW		 2975 /* device core frees rdev */
2976 rdev = ERR_PTR(ret);
2977 goto out;
2978
4fca9545
DB		 2979clean:
2980 kfree(rdev);
2981 rdev = ERR_PTR(ret);
2982 goto out;
414c70cb
LG		 2983}
2984EXPORT_SYMBOL_GPL(regulator_register);
2985
2986/**
2987 * regulator_unregister - unregister regulator
69279fb9 2988 * @rdev: regulator to unregister
414c70cb
LG		 2989 *
2990 * Called by regulator drivers to unregister a regulator.
2991 */
2992void regulator_unregister(struct regulator_dev *rdev)
2993{
2994 if (rdev == NULL)
2995 return;
2996
e032b376
MB		 2997 if (rdev->supply)
2998 regulator_put(rdev->supply);
414c70cb 2999 mutex_lock(&regulator_list_mutex);
1130e5b3 3000 debugfs_remove_recursive(rdev->debugfs);
da07ecd9 3001 flush_work_sync(&rdev->disable_work.work);
6bf87d17 3002 WARN_ON(rdev->open_count);
0f1d747b 3003 unset_regulator_supplies(rdev);
414c70cb 3004 list_del(&rdev->list);
f8c12fe3 3005 kfree(rdev->constraints);
58fb5cf5 3006 device_unregister(&rdev->dev);
414c70cb
LG		 3007 mutex_unlock(&regulator_list_mutex);
3008}
3009EXPORT_SYMBOL_GPL(regulator_unregister);
3010
414c70cb 3011/**
cf7bbcdf 3012 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 3013 * @state: system suspend state
3014 *
3015 * Configure each regulator with it's suspend operating parameters for state.
3016 * This will usually be called by machine suspend code prior to supending.
3017 */
3018int regulator_suspend_prepare(suspend_state_t state)
3019{
3020 struct regulator_dev *rdev;
3021 int ret = 0;
3022
3023 /* ON is handled by regulator active state */
3024 if (state == PM_SUSPEND_ON)
3025 return -EINVAL;
3026
3027 mutex_lock(&regulator_list_mutex);
3028 list_for_each_entry(rdev, &regulator_list, list) {
3029
3030 mutex_lock(&rdev->mutex);
3031 ret = suspend_prepare(rdev, state);
3032 mutex_unlock(&rdev->mutex);
3033
3034 if (ret < 0) {
5da84fd9 3035 rdev_err(rdev, "failed to prepare\n");
414c70cb
LG		 3036 goto out;
3037 }
3038 }
3039out:
3040 mutex_unlock(&regulator_list_mutex);
3041 return ret;
3042}
3043EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3044
7a32b589
MH		 3045/**
3046 * regulator_suspend_finish - resume regulators from system wide suspend
3047 *
3048 * Turn on regulators that might be turned off by regulator_suspend_prepare
3049 * and that should be turned on according to the regulators properties.
3050 */
3051int regulator_suspend_finish(void)
3052{
3053 struct regulator_dev *rdev;
3054 int ret = 0, error;
3055
3056 mutex_lock(&regulator_list_mutex);
3057 list_for_each_entry(rdev, &regulator_list, list) {
3058 struct regulator_ops *ops = rdev->desc->ops;
3059
3060 mutex_lock(&rdev->mutex);
3061 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3062 ops->enable) {
3063 error = ops->enable(rdev);
3064 if (error)
3065 ret = error;
3066 } else {
3067 if (!has_full_constraints)
3068 goto unlock;
3069 if (!ops->disable)
3070 goto unlock;
3071 if (ops->is_enabled && !ops->is_enabled(rdev))
3072 goto unlock;
3073
3074 error = ops->disable(rdev);
3075 if (error)
3076 ret = error;
3077 }
3078unlock:
3079 mutex_unlock(&rdev->mutex);
3080 }
3081 mutex_unlock(&regulator_list_mutex);
3082 return ret;
3083}
3084EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3085
ca725561
MB		 3086/**
3087 * regulator_has_full_constraints - the system has fully specified constraints
3088 *
3089 * Calling this function will cause the regulator API to disable all
3090 * regulators which have a zero use count and don't have an always_on
3091 * constraint in a late_initcall.
3092 *
3093 * The intention is that this will become the default behaviour in a
3094 * future kernel release so users are encouraged to use this facility
3095 * now.
3096 */
3097void regulator_has_full_constraints(void)
3098{
3099 has_full_constraints = 1;
3100}
3101EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3102
688fe99a
MB		 3103/**
3104 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3105 *
3106 * Calling this function will cause the regulator API to provide a
3107 * dummy regulator to consumers if no physical regulator is found,
3108 * allowing most consumers to proceed as though a regulator were
3109 * configured. This allows systems such as those with software
3110 * controllable regulators for the CPU core only to be brought up more
3111 * readily.
3112 */
3113void regulator_use_dummy_regulator(void)
3114{
3115 board_wants_dummy_regulator = true;
3116}
3117EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3118
414c70cb
LG		 3119/**
3120 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 3121 * @rdev: regulator
414c70cb
LG		 3122 *
3123 * Get rdev regulator driver private data. This call can be used in the
3124 * regulator driver context.
3125 */
3126void *rdev_get_drvdata(struct regulator_dev *rdev)
3127{
3128 return rdev->reg_data;
3129}
3130EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3131
3132/**
3133 * regulator_get_drvdata - get regulator driver data
3134 * @regulator: regulator
3135 *
3136 * Get regulator driver private data. This call can be used in the consumer
3137 * driver context when non API regulator specific functions need to be called.
3138 */
3139void *regulator_get_drvdata(struct regulator *regulator)
3140{
3141 return regulator->rdev->reg_data;
3142}
3143EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3144
3145/**
3146 * regulator_set_drvdata - set regulator driver data
3147 * @regulator: regulator
3148 * @data: data
3149 */
3150void regulator_set_drvdata(struct regulator *regulator, void *data)
3151{
3152 regulator->rdev->reg_data = data;
3153}
3154EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3155
3156/**
3157 * regulator_get_id - get regulator ID
69279fb9 3158 * @rdev: regulator
414c70cb
LG		 3159 */
3160int rdev_get_id(struct regulator_dev *rdev)
3161{
3162 return rdev->desc->id;
3163}
3164EXPORT_SYMBOL_GPL(rdev_get_id);
3165
a5766f11
LG		 3166struct device *rdev_get_dev(struct regulator_dev *rdev)
3167{
3168 return &rdev->dev;
3169}
3170EXPORT_SYMBOL_GPL(rdev_get_dev);
3171
3172void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3173{
3174 return reg_init_data->driver_data;
3175}
3176EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3177
ba55a974
MB		 3178#ifdef CONFIG_DEBUG_FS
3179static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3180 size_t count, loff_t *ppos)
3181{
3182 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3183 ssize_t len, ret = 0;
3184 struct regulator_map *map;
3185
3186 if (!buf)
3187 return -ENOMEM;
3188
3189 list_for_each_entry(map, &regulator_map_list, list) {
3190 len = snprintf(buf + ret, PAGE_SIZE - ret,
3191 "%s -> %s.%s\n",
3192 rdev_get_name(map->regulator), map->dev_name,
3193 map->supply);
3194 if (len >= 0)
3195 ret += len;
3196 if (ret > PAGE_SIZE) {
3197 ret = PAGE_SIZE;
3198 break;
3199 }
3200 }
3201
3202 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3203
3204 kfree(buf);
3205
3206 return ret;
3207}
24751434 3208#endif
ba55a974
MB		 3209
3210static const struct file_operations supply_map_fops = {
24751434 3211#ifdef CONFIG_DEBUG_FS
ba55a974
MB		 3212 .read = supply_map_read_file,
3213 .llseek = default_llseek,
ba55a974 3214#endif
24751434 3215};
ba55a974 3216
414c70cb
LG		 3217static int __init regulator_init(void)
3218{
34abbd68
MB		 3219 int ret;
3220
34abbd68
MB		 3221 ret = class_register(&regulator_class);
3222
1130e5b3 3223 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 3224 if (!debugfs_root)
1130e5b3 3225 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 3226
f4d562c6
MB		 3227 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3228 &supply_map_fops);
1130e5b3 3229
34abbd68
MB		 3230 regulator_dummy_init();
3231
3232 return ret;
414c70cb
LG		 3233}
3234
3235/* init early to allow our consumers to complete system booting */
3236core_initcall(regulator_init);
ca725561
MB		 3237
3238static int __init regulator_init_complete(void)
3239{
3240 struct regulator_dev *rdev;
3241 struct regulator_ops *ops;
3242 struct regulation_constraints *c;
3243 int enabled, ret;
ca725561
MB		 3244
3245 mutex_lock(&regulator_list_mutex);
3246
3247 /* If we have a full configuration then disable any regulators
3248 * which are not in use or always_on. This will become the
3249 * default behaviour in the future.
3250 */
3251 list_for_each_entry(rdev, &regulator_list, list) {
3252 ops = rdev->desc->ops;
3253 c = rdev->constraints;
3254
f25e0b4f 3255 if (!ops->disable || (c && c->always_on))
ca725561
MB		 3256 continue;
3257
3258 mutex_lock(&rdev->mutex);
3259
3260 if (rdev->use_count)
3261 goto unlock;
3262
3263 /* If we can't read the status assume it's on. */
3264 if (ops->is_enabled)
3265 enabled = ops->is_enabled(rdev);
3266 else
3267 enabled = 1;
3268
3269 if (!enabled)
3270 goto unlock;
3271
3272 if (has_full_constraints) {
3273 /* We log since this may kill the system if it
3274 * goes wrong. */
5da84fd9 3275 rdev_info(rdev, "disabling\n");
ca725561
MB		 3276 ret = ops->disable(rdev);
3277 if (ret != 0) {
5da84fd9 3278 rdev_err(rdev, "couldn't disable: %d\n", ret);
ca725561
MB		 3279 }
3280 } else {
3281 /* The intention is that in future we will
3282 * assume that full constraints are provided
3283 * so warn even if we aren't going to do
3284 * anything here.
3285 */
5da84fd9 3286 rdev_warn(rdev, "incomplete constraints, leaving on\n");
ca725561
MB		 3287 }
3288
3289unlock:
3290 mutex_unlock(&rdev->mutex);
3291 }
3292
3293 mutex_unlock(&regulator_list_mutex);
3294
3295 return 0;
3296}
3297late_initcall(regulator_init_complete);
kernel source for telekom puls (alcatel/mediatek)