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regulator: twl: add twl6030 set_mode
[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
1d7372e1 16#define pr_fmt(fmt) "%s: " fmt, __func__
c5e28ed7 17
414c70cb
LG		 18#include <linux/kernel.h>
19#include <linux/init.h>
1130e5b3 20#include <linux/debugfs.h>
414c70cb 21#include <linux/device.h>
5a0e3ad6 22#include <linux/slab.h>
414c70cb
LG		 23#include <linux/err.h>
24#include <linux/mutex.h>
25#include <linux/suspend.h>
31aae2be 26#include <linux/delay.h>
414c70cb
LG		 27#include <linux/regulator/consumer.h>
28#include <linux/regulator/driver.h>
29#include <linux/regulator/machine.h>
30
02fa3ec0
MB		 31#define CREATE_TRACE_POINTS
32#include <trace/events/regulator.h>
33
34abbd68
MB		 34#include "dummy.h"
35
5da84fd9
JP		 36#define rdev_err(rdev, fmt, ...) \
37 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
38#define rdev_warn(rdev, fmt, ...) \
39 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
40#define rdev_info(rdev, fmt, ...) \
41 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
42#define rdev_dbg(rdev, fmt, ...) \
43 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44
414c70cb
LG		 45static DEFINE_MUTEX(regulator_list_mutex);
46static LIST_HEAD(regulator_list);
47static LIST_HEAD(regulator_map_list);
21cf891a 48static bool has_full_constraints;
688fe99a 49static bool board_wants_dummy_regulator;
414c70cb 50
1130e5b3
MB		 51#ifdef CONFIG_DEBUG_FS
52static struct dentry *debugfs_root;
53#endif
54
8dc5390d 55/*
414c70cb
LG		 56 * struct regulator_map
57 *
58 * Used to provide symbolic supply names to devices.
59 */
60struct regulator_map {
61 struct list_head list;
40f9244f 62 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 63 const char *supply;
a5766f11 64 struct regulator_dev *regulator;
414c70cb
LG		 65};
66
414c70cb
LG		 67/*
68 * struct regulator
69 *
70 * One for each consumer device.
71 */
72struct regulator {
73 struct device *dev;
74 struct list_head list;
75 int uA_load;
76 int min_uV;
77 int max_uV;
414c70cb
LG		 78 char *supply_name;
79 struct device_attribute dev_attr;
80 struct regulator_dev *rdev;
81};
82
83static int _regulator_is_enabled(struct regulator_dev *rdev);
8cbf811d
JC		 84static int _regulator_disable(struct regulator_dev *rdev,
85 struct regulator_dev **supply_rdev_ptr);
414c70cb
LG		 86static int _regulator_get_voltage(struct regulator_dev *rdev);
87static int _regulator_get_current_limit(struct regulator_dev *rdev);
88static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
89static void _notifier_call_chain(struct regulator_dev *rdev,
90 unsigned long event, void *data);
75790251
MB		 91static int _regulator_do_set_voltage(struct regulator_dev *rdev,
92 int min_uV, int max_uV);
414c70cb 93
1083c393
MB		 94static const char *rdev_get_name(struct regulator_dev *rdev)
95{
96 if (rdev->constraints && rdev->constraints->name)
97 return rdev->constraints->name;
98 else if (rdev->desc->name)
99 return rdev->desc->name;
100 else
101 return "";
102}
103
414c70cb
LG		 104/* gets the regulator for a given consumer device */
105static struct regulator *get_device_regulator(struct device *dev)
106{
107 struct regulator *regulator = NULL;
108 struct regulator_dev *rdev;
109
110 mutex_lock(&regulator_list_mutex);
111 list_for_each_entry(rdev, &regulator_list, list) {
112 mutex_lock(&rdev->mutex);
113 list_for_each_entry(regulator, &rdev->consumer_list, list) {
114 if (regulator->dev == dev) {
115 mutex_unlock(&rdev->mutex);
116 mutex_unlock(&regulator_list_mutex);
117 return regulator;
118 }
119 }
120 mutex_unlock(&rdev->mutex);
121 }
122 mutex_unlock(&regulator_list_mutex);
123 return NULL;
124}
125
126/* Platform voltage constraint check */
127static int regulator_check_voltage(struct regulator_dev *rdev,
128 int *min_uV, int *max_uV)
129{
130 BUG_ON(*min_uV > *max_uV);
131
132 if (!rdev->constraints) {
5da84fd9 133 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 134 return -ENODEV;
135 }
136 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
5da84fd9 137 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 138 return -EPERM;
139 }
140
141 if (*max_uV > rdev->constraints->max_uV)
142 *max_uV = rdev->constraints->max_uV;
143 if (*min_uV < rdev->constraints->min_uV)
144 *min_uV = rdev->constraints->min_uV;
145
146 if (*min_uV > *max_uV)
147 return -EINVAL;
148
149 return 0;
150}
151
05fda3b1
TP		 152/* Make sure we select a voltage that suits the needs of all
153 * regulator consumers
154 */
155static int regulator_check_consumers(struct regulator_dev *rdev,
156 int *min_uV, int *max_uV)
157{
158 struct regulator *regulator;
159
160 list_for_each_entry(regulator, &rdev->consumer_list, list) {
161 if (*max_uV > regulator->max_uV)
162 *max_uV = regulator->max_uV;
163 if (*min_uV < regulator->min_uV)
164 *min_uV = regulator->min_uV;
165 }
166
167 if (*min_uV > *max_uV)
168 return -EINVAL;
169
170 return 0;
171}
172
414c70cb
LG		 173/* current constraint check */
174static int regulator_check_current_limit(struct regulator_dev *rdev,
175 int *min_uA, int *max_uA)
176{
177 BUG_ON(*min_uA > *max_uA);
178
179 if (!rdev->constraints) {
5da84fd9 180 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 181 return -ENODEV;
182 }
183 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
5da84fd9 184 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 185 return -EPERM;
186 }
187
188 if (*max_uA > rdev->constraints->max_uA)
189 *max_uA = rdev->constraints->max_uA;
190 if (*min_uA < rdev->constraints->min_uA)
191 *min_uA = rdev->constraints->min_uA;
192
193 if (*min_uA > *max_uA)
194 return -EINVAL;
195
196 return 0;
197}
198
199/* operating mode constraint check */
2c608234 200static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 201{
2c608234 202 switch (*mode) {
e573520b
DB		 203 case REGULATOR_MODE_FAST:
204 case REGULATOR_MODE_NORMAL:
205 case REGULATOR_MODE_IDLE:
206 case REGULATOR_MODE_STANDBY:
207 break;
208 default:
209 return -EINVAL;
210 }
211
414c70cb 212 if (!rdev->constraints) {
5da84fd9 213 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 214 return -ENODEV;
215 }
216 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
5da84fd9 217 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 218 return -EPERM;
219 }
2c608234
MB		 220
221 /* The modes are bitmasks, the most power hungry modes having
222 * the lowest values. If the requested mode isn't supported
223 * try higher modes. */
224 while (*mode) {
225 if (rdev->constraints->valid_modes_mask & *mode)
226 return 0;
227 *mode /= 2;
414c70cb 228 }
2c608234
MB		 229
230 return -EINVAL;
414c70cb
LG		 231}
232
233/* dynamic regulator mode switching constraint check */
234static int regulator_check_drms(struct regulator_dev *rdev)
235{
236 if (!rdev->constraints) {
5da84fd9 237 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 238 return -ENODEV;
239 }
240 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
5da84fd9 241 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 242 return -EPERM;
243 }
244 return 0;
245}
246
247static ssize_t device_requested_uA_show(struct device *dev,
248 struct device_attribute *attr, char *buf)
249{
250 struct regulator *regulator;
251
252 regulator = get_device_regulator(dev);
253 if (regulator == NULL)
254 return 0;
255
256 return sprintf(buf, "%d\n", regulator->uA_load);
257}
258
259static ssize_t regulator_uV_show(struct device *dev,
260 struct device_attribute *attr, char *buf)
261{
a5766f11 262 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 263 ssize_t ret;
264
265 mutex_lock(&rdev->mutex);
266 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
267 mutex_unlock(&rdev->mutex);
268
269 return ret;
270}
7ad68e2f 271static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 272
273static ssize_t regulator_uA_show(struct device *dev,
274 struct device_attribute *attr, char *buf)
275{
a5766f11 276 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 277
278 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
279}
7ad68e2f 280static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 281
bc558a60
MB		 282static ssize_t regulator_name_show(struct device *dev,
283 struct device_attribute *attr, char *buf)
284{
285 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 286
1083c393 287 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60
MB		 288}
289
4fca9545 290static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 291{
414c70cb
LG		 292 switch (mode) {
293 case REGULATOR_MODE_FAST:
294 return sprintf(buf, "fast\n");
295 case REGULATOR_MODE_NORMAL:
296 return sprintf(buf, "normal\n");
297 case REGULATOR_MODE_IDLE:
298 return sprintf(buf, "idle\n");
299 case REGULATOR_MODE_STANDBY:
300 return sprintf(buf, "standby\n");
301 }
302 return sprintf(buf, "unknown\n");
303}
304
4fca9545
DB		 305static ssize_t regulator_opmode_show(struct device *dev,
306 struct device_attribute *attr, char *buf)
414c70cb 307{
a5766f11 308 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 309
4fca9545
DB		 310 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
311}
7ad68e2f 312static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 313
314static ssize_t regulator_print_state(char *buf, int state)
315{
414c70cb
LG		 316 if (state > 0)
317 return sprintf(buf, "enabled\n");
318 else if (state == 0)
319 return sprintf(buf, "disabled\n");
320 else
321 return sprintf(buf, "unknown\n");
322}
323
4fca9545
DB		 324static ssize_t regulator_state_show(struct device *dev,
325 struct device_attribute *attr, char *buf)
326{
327 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 328 ssize_t ret;
329
330 mutex_lock(&rdev->mutex);
331 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
332 mutex_unlock(&rdev->mutex);
4fca9545 333
9332546f 334 return ret;
4fca9545 335}
7ad68e2f 336static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 337
853116a1
DB		 338static ssize_t regulator_status_show(struct device *dev,
339 struct device_attribute *attr, char *buf)
340{
341 struct regulator_dev *rdev = dev_get_drvdata(dev);
342 int status;
343 char *label;
344
345 status = rdev->desc->ops->get_status(rdev);
346 if (status < 0)
347 return status;
348
349 switch (status) {
350 case REGULATOR_STATUS_OFF:
351 label = "off";
352 break;
353 case REGULATOR_STATUS_ON:
354 label = "on";
355 break;
356 case REGULATOR_STATUS_ERROR:
357 label = "error";
358 break;
359 case REGULATOR_STATUS_FAST:
360 label = "fast";
361 break;
362 case REGULATOR_STATUS_NORMAL:
363 label = "normal";
364 break;
365 case REGULATOR_STATUS_IDLE:
366 label = "idle";
367 break;
368 case REGULATOR_STATUS_STANDBY:
369 label = "standby";
370 break;
371 default:
372 return -ERANGE;
373 }
374
375 return sprintf(buf, "%s\n", label);
376}
377static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
378
414c70cb
LG		 379static ssize_t regulator_min_uA_show(struct device *dev,
380 struct device_attribute *attr, char *buf)
381{
a5766f11 382 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 383
384 if (!rdev->constraints)
385 return sprintf(buf, "constraint not defined\n");
386
387 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
388}
7ad68e2f 389static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 390
391static ssize_t regulator_max_uA_show(struct device *dev,
392 struct device_attribute *attr, char *buf)
393{
a5766f11 394 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 395
396 if (!rdev->constraints)
397 return sprintf(buf, "constraint not defined\n");
398
399 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
400}
7ad68e2f 401static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 402
403static ssize_t regulator_min_uV_show(struct device *dev,
404 struct device_attribute *attr, char *buf)
405{
a5766f11 406 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 407
408 if (!rdev->constraints)
409 return sprintf(buf, "constraint not defined\n");
410
411 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
412}
7ad68e2f 413static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 414
415static ssize_t regulator_max_uV_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
417{
a5766f11 418 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 419
420 if (!rdev->constraints)
421 return sprintf(buf, "constraint not defined\n");
422
423 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
424}
7ad68e2f 425static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 426
427static ssize_t regulator_total_uA_show(struct device *dev,
428 struct device_attribute *attr, char *buf)
429{
a5766f11 430 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 431 struct regulator *regulator;
432 int uA = 0;
433
434 mutex_lock(&rdev->mutex);
435 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 436 uA += regulator->uA_load;
414c70cb
LG		 437 mutex_unlock(&rdev->mutex);
438 return sprintf(buf, "%d\n", uA);
439}
7ad68e2f 440static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb
LG		 441
442static ssize_t regulator_num_users_show(struct device *dev,
443 struct device_attribute *attr, char *buf)
444{
a5766f11 445 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 446 return sprintf(buf, "%d\n", rdev->use_count);
447}
448
449static ssize_t regulator_type_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 switch (rdev->desc->type) {
455 case REGULATOR_VOLTAGE:
456 return sprintf(buf, "voltage\n");
457 case REGULATOR_CURRENT:
458 return sprintf(buf, "current\n");
459 }
460 return sprintf(buf, "unknown\n");
461}
462
463static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
464 struct device_attribute *attr, char *buf)
465{
a5766f11 466 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 467
414c70cb
LG		 468 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
469}
7ad68e2f
DB		 470static DEVICE_ATTR(suspend_mem_microvolts, 0444,
471 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 472
473static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
474 struct device_attribute *attr, char *buf)
475{
a5766f11 476 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 477
414c70cb
LG		 478 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
479}
7ad68e2f
DB		 480static DEVICE_ATTR(suspend_disk_microvolts, 0444,
481 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 482
483static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
484 struct device_attribute *attr, char *buf)
485{
a5766f11 486 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 487
414c70cb
LG		 488 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
489}
7ad68e2f
DB		 490static DEVICE_ATTR(suspend_standby_microvolts, 0444,
491 regulator_suspend_standby_uV_show, NULL);
414c70cb 492
414c70cb
LG		 493static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
494 struct device_attribute *attr, char *buf)
495{
a5766f11 496 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 497
4fca9545
DB		 498 return regulator_print_opmode(buf,
499 rdev->constraints->state_mem.mode);
414c70cb 500}
7ad68e2f
DB		 501static DEVICE_ATTR(suspend_mem_mode, 0444,
502 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 503
504static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
505 struct device_attribute *attr, char *buf)
506{
a5766f11 507 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 508
4fca9545
DB		 509 return regulator_print_opmode(buf,
510 rdev->constraints->state_disk.mode);
414c70cb 511}
7ad68e2f
DB		 512static DEVICE_ATTR(suspend_disk_mode, 0444,
513 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 514
515static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
516 struct device_attribute *attr, char *buf)
517{
a5766f11 518 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 519
4fca9545
DB		 520 return regulator_print_opmode(buf,
521 rdev->constraints->state_standby.mode);
414c70cb 522}
7ad68e2f
DB		 523static DEVICE_ATTR(suspend_standby_mode, 0444,
524 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 525
526static ssize_t regulator_suspend_mem_state_show(struct device *dev,
527 struct device_attribute *attr, char *buf)
528{
a5766f11 529 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 530
4fca9545
DB		 531 return regulator_print_state(buf,
532 rdev->constraints->state_mem.enabled);
414c70cb 533}
7ad68e2f
DB		 534static DEVICE_ATTR(suspend_mem_state, 0444,
535 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 536
537static ssize_t regulator_suspend_disk_state_show(struct device *dev,
538 struct device_attribute *attr, char *buf)
539{
a5766f11 540 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 541
4fca9545
DB		 542 return regulator_print_state(buf,
543 rdev->constraints->state_disk.enabled);
414c70cb 544}
7ad68e2f
DB		 545static DEVICE_ATTR(suspend_disk_state, 0444,
546 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 547
548static ssize_t regulator_suspend_standby_state_show(struct device *dev,
549 struct device_attribute *attr, char *buf)
550{
a5766f11 551 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 552
4fca9545
DB		 553 return regulator_print_state(buf,
554 rdev->constraints->state_standby.enabled);
414c70cb 555}
7ad68e2f
DB		 556static DEVICE_ATTR(suspend_standby_state, 0444,
557 regulator_suspend_standby_state_show, NULL);
558
bc558a60 559
7ad68e2f
DB		 560/*
561 * These are the only attributes are present for all regulators.
562 * Other attributes are a function of regulator functionality.
563 */
414c70cb 564static struct device_attribute regulator_dev_attrs[] = {
bc558a60 565 __ATTR(name, 0444, regulator_name_show, NULL),
414c70cb
LG		 566 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
567 __ATTR(type, 0444, regulator_type_show, NULL),
414c70cb
LG		 568 __ATTR_NULL,
569};
570
571static void regulator_dev_release(struct device *dev)
572{
a5766f11 573 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 574 kfree(rdev);
575}
576
577static struct class regulator_class = {
578 .name = "regulator",
579 .dev_release = regulator_dev_release,
580 .dev_attrs = regulator_dev_attrs,
581};
582
583/* Calculate the new optimum regulator operating mode based on the new total
584 * consumer load. All locks held by caller */
585static void drms_uA_update(struct regulator_dev *rdev)
586{
587 struct regulator *sibling;
588 int current_uA = 0, output_uV, input_uV, err;
589 unsigned int mode;
590
591 err = regulator_check_drms(rdev);
592 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
476c2d83
MB		 593 (!rdev->desc->ops->get_voltage &&
594 !rdev->desc->ops->get_voltage_sel) ||
595 !rdev->desc->ops->set_mode)
036de8ef 596 return;
414c70cb
LG		 597
598 /* get output voltage */
1bf5a1f8 599 output_uV = _regulator_get_voltage(rdev);
414c70cb
LG		 600 if (output_uV <= 0)
601 return;
602
603 /* get input voltage */
1bf5a1f8
MB		 604 input_uV = 0;
605 if (rdev->supply)
606 input_uV = _regulator_get_voltage(rdev);
607 if (input_uV <= 0)
414c70cb
LG		 608 input_uV = rdev->constraints->input_uV;
609 if (input_uV <= 0)
610 return;
611
612 /* calc total requested load */
613 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 614 current_uA += sibling->uA_load;
414c70cb
LG		 615
616 /* now get the optimum mode for our new total regulator load */
617 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
618 output_uV, current_uA);
619
620 /* check the new mode is allowed */
2c608234 621 err = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 622 if (err == 0)
623 rdev->desc->ops->set_mode(rdev, mode);
624}
625
626static int suspend_set_state(struct regulator_dev *rdev,
627 struct regulator_state *rstate)
628{
629 int ret = 0;
638f85c5
MB		 630 bool can_set_state;
631
632 can_set_state = rdev->desc->ops->set_suspend_enable &&
633 rdev->desc->ops->set_suspend_disable;
634
635 /* If we have no suspend mode configration don't set anything;
636 * only warn if the driver actually makes the suspend mode
637 * configurable.
638 */
639 if (!rstate->enabled && !rstate->disabled) {
640 if (can_set_state)
5da84fd9 641 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 642 return 0;
643 }
644
645 if (rstate->enabled && rstate->disabled) {
5da84fd9 646 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 647 return -EINVAL;
648 }
414c70cb 649
638f85c5 650 if (!can_set_state) {
5da84fd9 651 rdev_err(rdev, "no way to set suspend state\n");
414c70cb 652 return -EINVAL;
a5766f11 653 }
414c70cb
LG		 654
655 if (rstate->enabled)
656 ret = rdev->desc->ops->set_suspend_enable(rdev);
657 else
658 ret = rdev->desc->ops->set_suspend_disable(rdev);
659 if (ret < 0) {
5da84fd9 660 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 661 return ret;
662 }
663
664 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
665 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
666 if (ret < 0) {
5da84fd9 667 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 668 return ret;
669 }
670 }
671
672 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
673 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
674 if (ret < 0) {
5da84fd9 675 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 676 return ret;
677 }
678 }
679 return ret;
680}
681
682/* locks held by caller */
683static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
684{
685 if (!rdev->constraints)
686 return -EINVAL;
687
688 switch (state) {
689 case PM_SUSPEND_STANDBY:
690 return suspend_set_state(rdev,
691 &rdev->constraints->state_standby);
692 case PM_SUSPEND_MEM:
693 return suspend_set_state(rdev,
694 &rdev->constraints->state_mem);
695 case PM_SUSPEND_MAX:
696 return suspend_set_state(rdev,
697 &rdev->constraints->state_disk);
698 default:
699 return -EINVAL;
700 }
701}
702
703static void print_constraints(struct regulator_dev *rdev)
704{
705 struct regulation_constraints *constraints = rdev->constraints;
973e9a27 706 char buf[80] = "";
8f031b48
MB		 707 int count = 0;
708 int ret;
414c70cb 709
8f031b48 710 if (constraints->min_uV && constraints->max_uV) {
414c70cb 711 if (constraints->min_uV == constraints->max_uV)
8f031b48
MB		 712 count += sprintf(buf + count, "%d mV ",
713 constraints->min_uV / 1000);
414c70cb 714 else
8f031b48
MB		 715 count += sprintf(buf + count, "%d <--> %d mV ",
716 constraints->min_uV / 1000,
717 constraints->max_uV / 1000);
718 }
719
720 if (!constraints->min_uV ||
721 constraints->min_uV != constraints->max_uV) {
722 ret = _regulator_get_voltage(rdev);
723 if (ret > 0)
724 count += sprintf(buf + count, "at %d mV ", ret / 1000);
725 }
726
727 if (constraints->min_uA && constraints->max_uA) {
414c70cb 728 if (constraints->min_uA == constraints->max_uA)
8f031b48
MB		 729 count += sprintf(buf + count, "%d mA ",
730 constraints->min_uA / 1000);
414c70cb 731 else
8f031b48
MB		 732 count += sprintf(buf + count, "%d <--> %d mA ",
733 constraints->min_uA / 1000,
734 constraints->max_uA / 1000);
735 }
736
737 if (!constraints->min_uA ||
738 constraints->min_uA != constraints->max_uA) {
739 ret = _regulator_get_current_limit(rdev);
740 if (ret > 0)
e4a6376b 741 count += sprintf(buf + count, "at %d mA ", ret / 1000);
414c70cb 742 }
8f031b48 743
414c70cb
LG		 744 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
745 count += sprintf(buf + count, "fast ");
746 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
747 count += sprintf(buf + count, "normal ");
748 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
749 count += sprintf(buf + count, "idle ");
750 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
751 count += sprintf(buf + count, "standby");
752
13ce29f8 753 rdev_info(rdev, "%s\n", buf);
414c70cb
LG		 754}
755
e79055d6 756static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 757 struct regulation_constraints *constraints)
a5766f11 758{
e5fda26c 759 struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 760 int ret;
761
762 /* do we need to apply the constraint voltage */
763 if (rdev->constraints->apply_uV &&
75790251
MB		 764 rdev->constraints->min_uV == rdev->constraints->max_uV) {
765 ret = _regulator_do_set_voltage(rdev,
766 rdev->constraints->min_uV,
767 rdev->constraints->max_uV);
768 if (ret < 0) {
769 rdev_err(rdev, "failed to apply %duV constraint\n",
770 rdev->constraints->min_uV);
771 rdev->constraints = NULL;
772 return ret;
773 }
af5866c9 774 }
e06f5b4f 775
4367cfdc
DB		 776 /* constrain machine-level voltage specs to fit
777 * the actual range supported by this regulator.
778 */
779 if (ops->list_voltage && rdev->desc->n_voltages) {
780 int count = rdev->desc->n_voltages;
781 int i;
782 int min_uV = INT_MAX;
783 int max_uV = INT_MIN;
784 int cmin = constraints->min_uV;
785 int cmax = constraints->max_uV;
786
3e590918
MB		 787 /* it's safe to autoconfigure fixed-voltage supplies
788 and the constraints are used by list_voltage. */
4367cfdc 789 if (count == 1 && !cmin) {
3e590918 790 cmin = 1;
4367cfdc 791 cmax = INT_MAX;
3e590918
MB		 792 constraints->min_uV = cmin;
793 constraints->max_uV = cmax;
4367cfdc
DB		 794 }
795
3e2b9abd
MB		 796 /* voltage constraints are optional */
797 if ((cmin == 0) && (cmax == 0))
e79055d6 798 return 0;
3e2b9abd 799
4367cfdc 800 /* else require explicit machine-level constraints */
3e2b9abd 801 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 802 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 803 return -EINVAL;
4367cfdc
DB		 804 }
805
806 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
807 for (i = 0; i < count; i++) {
808 int value;
809
810 value = ops->list_voltage(rdev, i);
811 if (value <= 0)
812 continue;
813
814 /* maybe adjust [min_uV..max_uV] */
815 if (value >= cmin && value < min_uV)
816 min_uV = value;
817 if (value <= cmax && value > max_uV)
818 max_uV = value;
819 }
820
821 /* final: [min_uV..max_uV] valid iff constraints valid */
822 if (max_uV < min_uV) {
5da84fd9 823 rdev_err(rdev, "unsupportable voltage constraints\n");
e79055d6 824 return -EINVAL;
4367cfdc
DB		 825 }
826
827 /* use regulator's subset of machine constraints */
828 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 829 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
830 constraints->min_uV, min_uV);
4367cfdc
DB		 831 constraints->min_uV = min_uV;
832 }
833 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 834 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
835 constraints->max_uV, max_uV);
4367cfdc
DB		 836 constraints->max_uV = max_uV;
837 }
838 }
839
e79055d6
MB		 840 return 0;
841}
842
843/**
844 * set_machine_constraints - sets regulator constraints
845 * @rdev: regulator source
846 * @constraints: constraints to apply
847 *
848 * Allows platform initialisation code to define and constrain
849 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
850 * Constraints *must* be set by platform code in order for some
851 * regulator operations to proceed i.e. set_voltage, set_current_limit,
852 * set_mode.
853 */
854static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 855 const struct regulation_constraints *constraints)
e79055d6
MB		 856{
857 int ret = 0;
e79055d6
MB		 858 struct regulator_ops *ops = rdev->desc->ops;
859
f8c12fe3
MB		 860 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
861 GFP_KERNEL);
862 if (!rdev->constraints)
863 return -ENOMEM;
af5866c9 864
f8c12fe3 865 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6
MB		 866 if (ret != 0)
867 goto out;
868
a5766f11 869 /* do we need to setup our suspend state */
e06f5b4f 870 if (constraints->initial_state) {
f8c12fe3 871 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 872 if (ret < 0) {
5da84fd9 873 rdev_err(rdev, "failed to set suspend state\n");
e06f5b4f
MB		 874 rdev->constraints = NULL;
875 goto out;
876 }
877 }
a5766f11 878
a308466c
MB		 879 if (constraints->initial_mode) {
880 if (!ops->set_mode) {
5da84fd9 881 rdev_err(rdev, "no set_mode operation\n");
a308466c
MB		 882 ret = -EINVAL;
883 goto out;
884 }
885
f8c12fe3 886 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 887 if (ret < 0) {
5da84fd9 888 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
a308466c
MB		 889 goto out;
890 }
891 }
892
cacf90f2
MB		 893 /* If the constraints say the regulator should be on at this point
894 * and we have control then make sure it is enabled.
895 */
f8c12fe3
MB		 896 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
897 ops->enable) {
e5fda26c
MB		 898 ret = ops->enable(rdev);
899 if (ret < 0) {
5da84fd9 900 rdev_err(rdev, "failed to enable\n");
e5fda26c
MB		 901 rdev->constraints = NULL;
902 goto out;
903 }
904 }
905
a5766f11
LG		 906 print_constraints(rdev);
907out:
908 return ret;
909}
910
911/**
912 * set_supply - set regulator supply regulator
69279fb9
MB		 913 * @rdev: regulator name
914 * @supply_rdev: supply regulator name
a5766f11
LG		 915 *
916 * Called by platform initialisation code to set the supply regulator for this
917 * regulator. This ensures that a regulators supply will also be enabled by the
918 * core if it's child is enabled.
919 */
920static int set_supply(struct regulator_dev *rdev,
921 struct regulator_dev *supply_rdev)
922{
923 int err;
924
925 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
926 "supply");
927 if (err) {
5da84fd9
JP		 928 rdev_err(rdev, "could not add device link %s err %d\n",
929 supply_rdev->dev.kobj.name, err);
a5766f11
LG		 930 goto out;
931 }
932 rdev->supply = supply_rdev;
933 list_add(&rdev->slist, &supply_rdev->supply_list);
934out:
935 return err;
936}
937
938/**
06c63f93 939 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9
MB		 940 * @rdev: regulator source
941 * @consumer_dev: device the supply applies to
40f9244f 942 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 943 * @supply: symbolic name for supply
a5766f11
LG		 944 *
945 * Allows platform initialisation code to map physical regulator
946 * sources to symbolic names for supplies for use by devices. Devices
947 * should use these symbolic names to request regulators, avoiding the
948 * need to provide board-specific regulator names as platform data.
40f9244f
MB		 949 *
950 * Only one of consumer_dev and consumer_dev_name may be specified.
a5766f11
LG		 951 */
952static int set_consumer_device_supply(struct regulator_dev *rdev,
40f9244f
MB		 953 struct device *consumer_dev, const char *consumer_dev_name,
954 const char *supply)
a5766f11
LG		 955{
956 struct regulator_map *node;
9ed2099e 957 int has_dev;
a5766f11 958
40f9244f
MB		 959 if (consumer_dev && consumer_dev_name)
960 return -EINVAL;
961
962 if (!consumer_dev_name && consumer_dev)
963 consumer_dev_name = dev_name(consumer_dev);
964
a5766f11
LG		 965 if (supply == NULL)
966 return -EINVAL;
967
9ed2099e
MB		 968 if (consumer_dev_name != NULL)
969 has_dev = 1;
970 else
971 has_dev = 0;
972
6001e13c 973 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 974 if (node->dev_name && consumer_dev_name) {
975 if (strcmp(node->dev_name, consumer_dev_name) != 0)
976 continue;
977 } else if (node->dev_name || consumer_dev_name) {
6001e13c 978 continue;
23b5cc2a
JN		 979 }
980
6001e13c
DB		 981 if (strcmp(node->supply, supply) != 0)
982 continue;
983
984 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
5da84fd9
JP		 985 dev_name(&node->regulator->dev),
986 node->regulator->desc->name,
987 supply,
988 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 989 return -EBUSY;
990 }
991
9ed2099e 992 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 993 if (node == NULL)
994 return -ENOMEM;
995
996 node->regulator = rdev;
a5766f11
LG		 997 node->supply = supply;
998
9ed2099e
MB		 999 if (has_dev) {
1000 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1001 if (node->dev_name == NULL) {
1002 kfree(node);
1003 return -ENOMEM;
1004 }
40f9244f
MB		 1005 }
1006
a5766f11
LG		 1007 list_add(&node->list, &regulator_map_list);
1008 return 0;
1009}
1010
0f1d747b
MR		 1011static void unset_regulator_supplies(struct regulator_dev *rdev)
1012{
1013 struct regulator_map *node, *n;
1014
1015 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1016 if (rdev == node->regulator) {
1017 list_del(&node->list);
40f9244f 1018 kfree(node->dev_name);
0f1d747b 1019 kfree(node);
0f1d747b
MR		 1020 }
1021 }
1022}
1023
414c70cb
LG		 1024#define REG_STR_SIZE 32
1025
1026static struct regulator *create_regulator(struct regulator_dev *rdev,
1027 struct device *dev,
1028 const char *supply_name)
1029{
1030 struct regulator *regulator;
1031 char buf[REG_STR_SIZE];
1032 int err, size;
1033
1034 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1035 if (regulator == NULL)
1036 return NULL;
1037
1038 mutex_lock(&rdev->mutex);
1039 regulator->rdev = rdev;
1040 list_add(&regulator->list, &rdev->consumer_list);
1041
1042 if (dev) {
1043 /* create a 'requested_microamps_name' sysfs entry */
1044 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
1045 supply_name);
1046 if (size >= REG_STR_SIZE)
1047 goto overflow_err;
1048
1049 regulator->dev = dev;
4f26a2ab 1050 sysfs_attr_init(&regulator->dev_attr.attr);
414c70cb
LG		 1051 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1052 if (regulator->dev_attr.attr.name == NULL)
1053 goto attr_name_err;
1054
414c70cb
LG		 1055 regulator->dev_attr.attr.mode = 0444;
1056 regulator->dev_attr.show = device_requested_uA_show;
1057 err = device_create_file(dev, &regulator->dev_attr);
1058 if (err < 0) {
5da84fd9 1059 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
414c70cb
LG		 1060 goto attr_name_err;
1061 }
1062
1063 /* also add a link to the device sysfs entry */
1064 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1065 dev->kobj.name, supply_name);
1066 if (size >= REG_STR_SIZE)
1067 goto attr_err;
1068
1069 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1070 if (regulator->supply_name == NULL)
1071 goto attr_err;
1072
1073 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1074 buf);
1075 if (err) {
5da84fd9
JP		 1076 rdev_warn(rdev, "could not add device link %s err %d\n",
1077 dev->kobj.name, err);
414c70cb
LG		 1078 goto link_name_err;
1079 }
1080 }
1081 mutex_unlock(&rdev->mutex);
1082 return regulator;
1083link_name_err:
1084 kfree(regulator->supply_name);
1085attr_err:
1086 device_remove_file(regulator->dev, &regulator->dev_attr);
1087attr_name_err:
1088 kfree(regulator->dev_attr.attr.name);
1089overflow_err:
1090 list_del(&regulator->list);
1091 kfree(regulator);
1092 mutex_unlock(&rdev->mutex);
1093 return NULL;
1094}
1095
31aae2be
MB		 1096static int _regulator_get_enable_time(struct regulator_dev *rdev)
1097{
1098 if (!rdev->desc->ops->enable_time)
1099 return 0;
1100 return rdev->desc->ops->enable_time(rdev);
1101}
1102
5ffbd136
MB		 1103/* Internal regulator request function */
1104static struct regulator *_regulator_get(struct device *dev, const char *id,
1105 int exclusive)
414c70cb
LG		 1106{
1107 struct regulator_dev *rdev;
1108 struct regulator_map *map;
1109 struct regulator *regulator = ERR_PTR(-ENODEV);
40f9244f 1110 const char *devname = NULL;
5ffbd136 1111 int ret;
414c70cb
LG		 1112
1113 if (id == NULL) {
5da84fd9 1114 pr_err("get() with no identifier\n");
414c70cb
LG		 1115 return regulator;
1116 }
1117
40f9244f
MB		 1118 if (dev)
1119 devname = dev_name(dev);
1120
414c70cb
LG		 1121 mutex_lock(&regulator_list_mutex);
1122
1123 list_for_each_entry(map, &regulator_map_list, list) {
40f9244f
MB		 1124 /* If the mapping has a device set up it must match */
1125 if (map->dev_name &&
1126 (!devname || strcmp(map->dev_name, devname)))
1127 continue;
1128
1129 if (strcmp(map->supply, id) == 0) {
a5766f11 1130 rdev = map->regulator;
414c70cb 1131 goto found;
a5766f11 1132 }
414c70cb 1133 }
34abbd68 1134
688fe99a
MB		 1135 if (board_wants_dummy_regulator) {
1136 rdev = dummy_regulator_rdev;
1137 goto found;
1138 }
1139
34abbd68
MB		 1140#ifdef CONFIG_REGULATOR_DUMMY
1141 if (!devname)
1142 devname = "deviceless";
1143
1144 /* If the board didn't flag that it was fully constrained then
1145 * substitute in a dummy regulator so consumers can continue.
1146 */
1147 if (!has_full_constraints) {
5da84fd9
JP		 1148 pr_warn("%s supply %s not found, using dummy regulator\n",
1149 devname, id);
34abbd68
MB		 1150 rdev = dummy_regulator_rdev;
1151 goto found;
1152 }
1153#endif
1154
414c70cb
LG		 1155 mutex_unlock(&regulator_list_mutex);
1156 return regulator;
1157
1158found:
5ffbd136
MB		 1159 if (rdev->exclusive) {
1160 regulator = ERR_PTR(-EPERM);
1161 goto out;
1162 }
1163
1164 if (exclusive && rdev->open_count) {
1165 regulator = ERR_PTR(-EBUSY);
1166 goto out;
1167 }
1168
a5766f11
LG		 1169 if (!try_module_get(rdev->owner))
1170 goto out;
1171
414c70cb
LG		 1172 regulator = create_regulator(rdev, dev, id);
1173 if (regulator == NULL) {
1174 regulator = ERR_PTR(-ENOMEM);
1175 module_put(rdev->owner);
1176 }
1177
5ffbd136
MB		 1178 rdev->open_count++;
1179 if (exclusive) {
1180 rdev->exclusive = 1;
1181
1182 ret = _regulator_is_enabled(rdev);
1183 if (ret > 0)
1184 rdev->use_count = 1;
1185 else
1186 rdev->use_count = 0;
1187 }
1188
a5766f11 1189out:
414c70cb 1190 mutex_unlock(&regulator_list_mutex);
5ffbd136 1191
414c70cb
LG		 1192 return regulator;
1193}
5ffbd136
MB		 1194
1195/**
1196 * regulator_get - lookup and obtain a reference to a regulator.
1197 * @dev: device for regulator "consumer"
1198 * @id: Supply name or regulator ID.
1199 *
1200 * Returns a struct regulator corresponding to the regulator producer,
1201 * or IS_ERR() condition containing errno.
1202 *
1203 * Use of supply names configured via regulator_set_device_supply() is
1204 * strongly encouraged. It is recommended that the supply name used
1205 * should match the name used for the supply and/or the relevant
1206 * device pins in the datasheet.
1207 */
1208struct regulator *regulator_get(struct device *dev, const char *id)
1209{
1210 return _regulator_get(dev, id, 0);
1211}
414c70cb
LG		 1212EXPORT_SYMBOL_GPL(regulator_get);
1213
5ffbd136
MB		 1214/**
1215 * regulator_get_exclusive - obtain exclusive access to a regulator.
1216 * @dev: device for regulator "consumer"
1217 * @id: Supply name or regulator ID.
1218 *
1219 * Returns a struct regulator corresponding to the regulator producer,
1220 * or IS_ERR() condition containing errno. Other consumers will be
1221 * unable to obtain this reference is held and the use count for the
1222 * regulator will be initialised to reflect the current state of the
1223 * regulator.
1224 *
1225 * This is intended for use by consumers which cannot tolerate shared
1226 * use of the regulator such as those which need to force the
1227 * regulator off for correct operation of the hardware they are
1228 * controlling.
1229 *
1230 * Use of supply names configured via regulator_set_device_supply() is
1231 * strongly encouraged. It is recommended that the supply name used
1232 * should match the name used for the supply and/or the relevant
1233 * device pins in the datasheet.
1234 */
1235struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1236{
1237 return _regulator_get(dev, id, 1);
1238}
1239EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1240
414c70cb
LG		 1241/**
1242 * regulator_put - "free" the regulator source
1243 * @regulator: regulator source
1244 *
1245 * Note: drivers must ensure that all regulator_enable calls made on this
1246 * regulator source are balanced by regulator_disable calls prior to calling
1247 * this function.
1248 */
1249void regulator_put(struct regulator *regulator)
1250{
1251 struct regulator_dev *rdev;
1252
1253 if (regulator == NULL || IS_ERR(regulator))
1254 return;
1255
414c70cb
LG		 1256 mutex_lock(&regulator_list_mutex);
1257 rdev = regulator->rdev;
1258
1259 /* remove any sysfs entries */
1260 if (regulator->dev) {
1261 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1262 kfree(regulator->supply_name);
1263 device_remove_file(regulator->dev, &regulator->dev_attr);
1264 kfree(regulator->dev_attr.attr.name);
1265 }
1266 list_del(&regulator->list);
1267 kfree(regulator);
1268
5ffbd136
MB		 1269 rdev->open_count--;
1270 rdev->exclusive = 0;
1271
414c70cb
LG		 1272 module_put(rdev->owner);
1273 mutex_unlock(&regulator_list_mutex);
1274}
1275EXPORT_SYMBOL_GPL(regulator_put);
1276
9a2372fa
MB		 1277static int _regulator_can_change_status(struct regulator_dev *rdev)
1278{
1279 if (!rdev->constraints)
1280 return 0;
1281
1282 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
1283 return 1;
1284 else
1285 return 0;
1286}
1287
414c70cb
LG		 1288/* locks held by regulator_enable() */
1289static int _regulator_enable(struct regulator_dev *rdev)
1290{
31aae2be 1291 int ret, delay;
414c70cb 1292
acaf6ffe
BJ		 1293 if (rdev->use_count == 0) {
1294 /* do we need to enable the supply regulator first */
1295 if (rdev->supply) {
1296 mutex_lock(&rdev->supply->mutex);
1297 ret = _regulator_enable(rdev->supply);
1298 mutex_unlock(&rdev->supply->mutex);
1299 if (ret < 0) {
5da84fd9 1300 rdev_err(rdev, "failed to enable: %d\n", ret);
acaf6ffe
BJ		 1301 return ret;
1302 }
414c70cb
LG		 1303 }
1304 }
1305
1306 /* check voltage and requested load before enabling */
9a2372fa
MB		 1307 if (rdev->constraints &&
1308 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1309 drms_uA_update(rdev);
414c70cb 1310
9a2372fa
MB		 1311 if (rdev->use_count == 0) {
1312 /* The regulator may on if it's not switchable or left on */
1313 ret = _regulator_is_enabled(rdev);
1314 if (ret == -EINVAL || ret == 0) {
1315 if (!_regulator_can_change_status(rdev))
1316 return -EPERM;
1317
31aae2be 1318 if (!rdev->desc->ops->enable)
9a2372fa 1319 return -EINVAL;
31aae2be
MB		 1320
1321 /* Query before enabling in case configuration
25985edc 1322 * dependent. */
31aae2be
MB		 1323 ret = _regulator_get_enable_time(rdev);
1324 if (ret >= 0) {
1325 delay = ret;
1326 } else {
5da84fd9 1327 rdev_warn(rdev, "enable_time() failed: %d\n",
1d7372e1 1328 ret);
31aae2be 1329 delay = 0;
9a2372fa 1330 }
31aae2be 1331
02fa3ec0
MB		 1332 trace_regulator_enable(rdev_get_name(rdev));
1333
31aae2be
MB		 1334 /* Allow the regulator to ramp; it would be useful
1335 * to extend this for bulk operations so that the
1336 * regulators can ramp together. */
1337 ret = rdev->desc->ops->enable(rdev);
1338 if (ret < 0)
1339 return ret;
1340
02fa3ec0
MB		 1341 trace_regulator_enable_delay(rdev_get_name(rdev));
1342
e36c1df8 1343 if (delay >= 1000) {
31aae2be 1344 mdelay(delay / 1000);
e36c1df8
AL		 1345 udelay(delay % 1000);
1346 } else if (delay) {
31aae2be 1347 udelay(delay);
e36c1df8 1348 }
31aae2be 1349
02fa3ec0
MB		 1350 trace_regulator_enable_complete(rdev_get_name(rdev));
1351
a7433cff 1352 } else if (ret < 0) {
5da84fd9 1353 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 1354 return ret;
1355 }
a7433cff 1356 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 1357 }
1358
9a2372fa
MB		 1359 rdev->use_count++;
1360
1361 return 0;
414c70cb
LG		 1362}
1363
1364/**
1365 * regulator_enable - enable regulator output
1366 * @regulator: regulator source
1367 *
cf7bbcdf
MB		 1368 * Request that the regulator be enabled with the regulator output at
1369 * the predefined voltage or current value. Calls to regulator_enable()
1370 * must be balanced with calls to regulator_disable().
1371 *
414c70cb 1372 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 1373 * hardwired in the regulator.
414c70cb
LG		 1374 */
1375int regulator_enable(struct regulator *regulator)
1376{
412aec61
DB		 1377 struct regulator_dev *rdev = regulator->rdev;
1378 int ret = 0;
414c70cb 1379
412aec61 1380 mutex_lock(&rdev->mutex);
cd94b505 1381 ret = _regulator_enable(rdev);
412aec61 1382 mutex_unlock(&rdev->mutex);
414c70cb
LG		 1383 return ret;
1384}
1385EXPORT_SYMBOL_GPL(regulator_enable);
1386
1387/* locks held by regulator_disable() */
8cbf811d
JC		 1388static int _regulator_disable(struct regulator_dev *rdev,
1389 struct regulator_dev **supply_rdev_ptr)
414c70cb
LG		 1390{
1391 int ret = 0;
b12a1e29 1392 *supply_rdev_ptr = NULL;
414c70cb 1393
cd94b505 1394 if (WARN(rdev->use_count <= 0,
43e7ee33 1395 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 1396 return -EIO;
1397
414c70cb 1398 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 1399 if (rdev->use_count == 1 &&
1400 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 1401
1402 /* we are last user */
9a2372fa
MB		 1403 if (_regulator_can_change_status(rdev) &&
1404 rdev->desc->ops->disable) {
02fa3ec0
MB		 1405 trace_regulator_disable(rdev_get_name(rdev));
1406
414c70cb
LG		 1407 ret = rdev->desc->ops->disable(rdev);
1408 if (ret < 0) {
5da84fd9 1409 rdev_err(rdev, "failed to disable\n");
414c70cb
LG		 1410 return ret;
1411 }
84b68263 1412
02fa3ec0
MB		 1413 trace_regulator_disable_complete(rdev_get_name(rdev));
1414
84b68263
MB		 1415 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1416 NULL);
414c70cb
LG		 1417 }
1418
1419 /* decrease our supplies ref count and disable if required */
8cbf811d 1420 *supply_rdev_ptr = rdev->supply;
414c70cb
LG		 1421
1422 rdev->use_count = 0;
1423 } else if (rdev->use_count > 1) {
1424
1425 if (rdev->constraints &&
1426 (rdev->constraints->valid_ops_mask &
1427 REGULATOR_CHANGE_DRMS))
1428 drms_uA_update(rdev);
1429
1430 rdev->use_count--;
1431 }
1432 return ret;
1433}
1434
1435/**
1436 * regulator_disable - disable regulator output
1437 * @regulator: regulator source
1438 *
cf7bbcdf
MB		 1439 * Disable the regulator output voltage or current. Calls to
1440 * regulator_enable() must be balanced with calls to
1441 * regulator_disable().
69279fb9 1442 *
414c70cb 1443 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 1444 * devices have it enabled, the regulator device supports disabling and
1445 * machine constraints permit this operation.
414c70cb
LG		 1446 */
1447int regulator_disable(struct regulator *regulator)
1448{
412aec61 1449 struct regulator_dev *rdev = regulator->rdev;
8cbf811d 1450 struct regulator_dev *supply_rdev = NULL;
412aec61 1451 int ret = 0;
414c70cb 1452
412aec61 1453 mutex_lock(&rdev->mutex);
8cbf811d 1454 ret = _regulator_disable(rdev, &supply_rdev);
412aec61 1455 mutex_unlock(&rdev->mutex);
8cbf811d
JC		 1456
1457 /* decrease our supplies ref count and disable if required */
1458 while (supply_rdev != NULL) {
1459 rdev = supply_rdev;
1460
1461 mutex_lock(&rdev->mutex);
1462 _regulator_disable(rdev, &supply_rdev);
1463 mutex_unlock(&rdev->mutex);
1464 }
1465
414c70cb
LG		 1466 return ret;
1467}
1468EXPORT_SYMBOL_GPL(regulator_disable);
1469
1470/* locks held by regulator_force_disable() */
8cbf811d
JC		 1471static int _regulator_force_disable(struct regulator_dev *rdev,
1472 struct regulator_dev **supply_rdev_ptr)
414c70cb
LG		 1473{
1474 int ret = 0;
1475
1476 /* force disable */
1477 if (rdev->desc->ops->disable) {
1478 /* ah well, who wants to live forever... */
1479 ret = rdev->desc->ops->disable(rdev);
1480 if (ret < 0) {
5da84fd9 1481 rdev_err(rdev, "failed to force disable\n");
414c70cb
LG		 1482 return ret;
1483 }
1484 /* notify other consumers that power has been forced off */
84b68263
MB		 1485 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1486 REGULATOR_EVENT_DISABLE, NULL);
414c70cb
LG		 1487 }
1488
1489 /* decrease our supplies ref count and disable if required */
8cbf811d 1490 *supply_rdev_ptr = rdev->supply;
414c70cb
LG		 1491
1492 rdev->use_count = 0;
1493 return ret;
1494}
1495
1496/**
1497 * regulator_force_disable - force disable regulator output
1498 * @regulator: regulator source
1499 *
1500 * Forcibly disable the regulator output voltage or current.
1501 * NOTE: this *will* disable the regulator output even if other consumer
1502 * devices have it enabled. This should be used for situations when device
1503 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1504 */
1505int regulator_force_disable(struct regulator *regulator)
1506{
8cbf811d 1507 struct regulator_dev *supply_rdev = NULL;
414c70cb
LG		 1508 int ret;
1509
1510 mutex_lock(&regulator->rdev->mutex);
414c70cb 1511 regulator->uA_load = 0;
8cbf811d 1512 ret = _regulator_force_disable(regulator->rdev, &supply_rdev);
414c70cb 1513 mutex_unlock(&regulator->rdev->mutex);
8cbf811d
JC		 1514
1515 if (supply_rdev)
1516 regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev)));
1517
414c70cb
LG		 1518 return ret;
1519}
1520EXPORT_SYMBOL_GPL(regulator_force_disable);
1521
1522static int _regulator_is_enabled(struct regulator_dev *rdev)
1523{
9a7f6a4c 1524 /* If we don't know then assume that the regulator is always on */
9332546f 1525 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 1526 return 1;
414c70cb 1527
9332546f 1528 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 1529}
1530
1531/**
1532 * regulator_is_enabled - is the regulator output enabled
1533 * @regulator: regulator source
1534 *
412aec61
DB		 1535 * Returns positive if the regulator driver backing the source/client
1536 * has requested that the device be enabled, zero if it hasn't, else a
1537 * negative errno code.
1538 *
1539 * Note that the device backing this regulator handle can have multiple
1540 * users, so it might be enabled even if regulator_enable() was never
1541 * called for this particular source.
414c70cb
LG		 1542 */
1543int regulator_is_enabled(struct regulator *regulator)
1544{
9332546f
MB		 1545 int ret;
1546
1547 mutex_lock(&regulator->rdev->mutex);
1548 ret = _regulator_is_enabled(regulator->rdev);
1549 mutex_unlock(&regulator->rdev->mutex);
1550
1551 return ret;
414c70cb
LG		 1552}
1553EXPORT_SYMBOL_GPL(regulator_is_enabled);
1554
4367cfdc
DB		 1555/**
1556 * regulator_count_voltages - count regulator_list_voltage() selectors
1557 * @regulator: regulator source
1558 *
1559 * Returns number of selectors, or negative errno. Selectors are
1560 * numbered starting at zero, and typically correspond to bitfields
1561 * in hardware registers.
1562 */
1563int regulator_count_voltages(struct regulator *regulator)
1564{
1565 struct regulator_dev *rdev = regulator->rdev;
1566
1567 return rdev->desc->n_voltages ? : -EINVAL;
1568}
1569EXPORT_SYMBOL_GPL(regulator_count_voltages);
1570
1571/**
1572 * regulator_list_voltage - enumerate supported voltages
1573 * @regulator: regulator source
1574 * @selector: identify voltage to list
1575 * Context: can sleep
1576 *
1577 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 1578 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 1579 * negative errno.
1580 */
1581int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1582{
1583 struct regulator_dev *rdev = regulator->rdev;
1584 struct regulator_ops *ops = rdev->desc->ops;
1585 int ret;
1586
1587 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1588 return -EINVAL;
1589
1590 mutex_lock(&rdev->mutex);
1591 ret = ops->list_voltage(rdev, selector);
1592 mutex_unlock(&rdev->mutex);
1593
1594 if (ret > 0) {
1595 if (ret < rdev->constraints->min_uV)
1596 ret = 0;
1597 else if (ret > rdev->constraints->max_uV)
1598 ret = 0;
1599 }
1600
1601 return ret;
1602}
1603EXPORT_SYMBOL_GPL(regulator_list_voltage);
1604
a7a1ad90
MB		 1605/**
1606 * regulator_is_supported_voltage - check if a voltage range can be supported
1607 *
1608 * @regulator: Regulator to check.
1609 * @min_uV: Minimum required voltage in uV.
1610 * @max_uV: Maximum required voltage in uV.
1611 *
1612 * Returns a boolean or a negative error code.
1613 */
1614int regulator_is_supported_voltage(struct regulator *regulator,
1615 int min_uV, int max_uV)
1616{
1617 int i, voltages, ret;
1618
1619 ret = regulator_count_voltages(regulator);
1620 if (ret < 0)
1621 return ret;
1622 voltages = ret;
1623
1624 for (i = 0; i < voltages; i++) {
1625 ret = regulator_list_voltage(regulator, i);
1626
1627 if (ret >= min_uV && ret <= max_uV)
1628 return 1;
1629 }
1630
1631 return 0;
1632}
1633
75790251
MB		 1634static int _regulator_do_set_voltage(struct regulator_dev *rdev,
1635 int min_uV, int max_uV)
1636{
1637 int ret;
77af1b26 1638 int delay = 0;
75790251
MB		 1639 unsigned int selector;
1640
1641 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
1642
1643 if (rdev->desc->ops->set_voltage) {
1644 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
1645 &selector);
1646
1647 if (rdev->desc->ops->list_voltage)
1648 selector = rdev->desc->ops->list_voltage(rdev,
1649 selector);
1650 else
1651 selector = -1;
e8eef82b
MB		 1652 } else if (rdev->desc->ops->set_voltage_sel) {
1653 int best_val = INT_MAX;
1654 int i;
1655
1656 selector = 0;
1657
1658 /* Find the smallest voltage that falls within the specified
1659 * range.
1660 */
1661 for (i = 0; i < rdev->desc->n_voltages; i++) {
1662 ret = rdev->desc->ops->list_voltage(rdev, i);
1663 if (ret < 0)
1664 continue;
1665
1666 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
1667 best_val = ret;
1668 selector = i;
1669 }
1670 }
1671
77af1b26
LW		 1672 /*
1673 * If we can't obtain the old selector there is not enough
1674 * info to call set_voltage_time_sel().
1675 */
1676 if (rdev->desc->ops->set_voltage_time_sel &&
1677 rdev->desc->ops->get_voltage_sel) {
1678 unsigned int old_selector = 0;
1679
1680 ret = rdev->desc->ops->get_voltage_sel(rdev);
1681 if (ret < 0)
1682 return ret;
1683 old_selector = ret;
1684 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
1685 old_selector, selector);
1686 }
1687
e8eef82b
MB		 1688 if (best_val != INT_MAX) {
1689 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
1690 selector = best_val;
1691 } else {
1692 ret = -EINVAL;
1693 }
75790251
MB		 1694 } else {
1695 ret = -EINVAL;
1696 }
1697
77af1b26
LW		 1698 /* Insert any necessary delays */
1699 if (delay >= 1000) {
1700 mdelay(delay / 1000);
1701 udelay(delay % 1000);
1702 } else if (delay) {
1703 udelay(delay);
1704 }
1705
ded06a52
MB		 1706 if (ret == 0)
1707 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
1708 NULL);
1709
75790251
MB		 1710 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector);
1711
1712 return ret;
1713}
1714
414c70cb
LG		 1715/**
1716 * regulator_set_voltage - set regulator output voltage
1717 * @regulator: regulator source
1718 * @min_uV: Minimum required voltage in uV
1719 * @max_uV: Maximum acceptable voltage in uV
1720 *
1721 * Sets a voltage regulator to the desired output voltage. This can be set
1722 * during any regulator state. IOW, regulator can be disabled or enabled.
1723 *
1724 * If the regulator is enabled then the voltage will change to the new value
1725 * immediately otherwise if the regulator is disabled the regulator will
1726 * output at the new voltage when enabled.
1727 *
1728 * NOTE: If the regulator is shared between several devices then the lowest
1729 * request voltage that meets the system constraints will be used.
69279fb9 1730 * Regulator system constraints must be set for this regulator before
414c70cb
LG		 1731 * calling this function otherwise this call will fail.
1732 */
1733int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1734{
1735 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 1736 int ret = 0;
414c70cb
LG		 1737
1738 mutex_lock(&rdev->mutex);
1739
95a3c23a
MB		 1740 /* If we're setting the same range as last time the change
1741 * should be a noop (some cpufreq implementations use the same
1742 * voltage for multiple frequencies, for example).
1743 */
1744 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
1745 goto out;
1746
414c70cb 1747 /* sanity check */
e8eef82b
MB		 1748 if (!rdev->desc->ops->set_voltage &&
1749 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 1750 ret = -EINVAL;
1751 goto out;
1752 }
1753
1754 /* constraints check */
1755 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1756 if (ret < 0)
1757 goto out;
1758 regulator->min_uV = min_uV;
1759 regulator->max_uV = max_uV;
3a93f2a9 1760
05fda3b1
TP		 1761 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
1762 if (ret < 0)
1763 goto out;
1764
75790251 1765 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
02fa3ec0 1766
414c70cb
LG		 1767out:
1768 mutex_unlock(&rdev->mutex);
1769 return ret;
1770}
1771EXPORT_SYMBOL_GPL(regulator_set_voltage);
1772
88cd222b
LW		 1773/**
1774 * regulator_set_voltage_time - get raise/fall time
1775 * @regulator: regulator source
1776 * @old_uV: starting voltage in microvolts
1777 * @new_uV: target voltage in microvolts
1778 *
1779 * Provided with the starting and ending voltage, this function attempts to
1780 * calculate the time in microseconds required to rise or fall to this new
1781 * voltage.
1782 */
1783int regulator_set_voltage_time(struct regulator *regulator,
1784 int old_uV, int new_uV)
1785{
1786 struct regulator_dev *rdev = regulator->rdev;
1787 struct regulator_ops *ops = rdev->desc->ops;
1788 int old_sel = -1;
1789 int new_sel = -1;
1790 int voltage;
1791 int i;
1792
1793 /* Currently requires operations to do this */
1794 if (!ops->list_voltage || !ops->set_voltage_time_sel
1795 || !rdev->desc->n_voltages)
1796 return -EINVAL;
1797
1798 for (i = 0; i < rdev->desc->n_voltages; i++) {
1799 /* We only look for exact voltage matches here */
1800 voltage = regulator_list_voltage(regulator, i);
1801 if (voltage < 0)
1802 return -EINVAL;
1803 if (voltage == 0)
1804 continue;
1805 if (voltage == old_uV)
1806 old_sel = i;
1807 if (voltage == new_uV)
1808 new_sel = i;
1809 }
1810
1811 if (old_sel < 0 || new_sel < 0)
1812 return -EINVAL;
1813
1814 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
1815}
1816EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
1817
606a2562
MB		 1818/**
1819 * regulator_sync_voltage - re-apply last regulator output voltage
1820 * @regulator: regulator source
1821 *
1822 * Re-apply the last configured voltage. This is intended to be used
1823 * where some external control source the consumer is cooperating with
1824 * has caused the configured voltage to change.
1825 */
1826int regulator_sync_voltage(struct regulator *regulator)
1827{
1828 struct regulator_dev *rdev = regulator->rdev;
1829 int ret, min_uV, max_uV;
1830
1831 mutex_lock(&rdev->mutex);
1832
1833 if (!rdev->desc->ops->set_voltage &&
1834 !rdev->desc->ops->set_voltage_sel) {
1835 ret = -EINVAL;
1836 goto out;
1837 }
1838
1839 /* This is only going to work if we've had a voltage configured. */
1840 if (!regulator->min_uV && !regulator->max_uV) {
1841 ret = -EINVAL;
1842 goto out;
1843 }
1844
1845 min_uV = regulator->min_uV;
1846 max_uV = regulator->max_uV;
1847
1848 /* This should be a paranoia check... */
1849 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1850 if (ret < 0)
1851 goto out;
1852
1853 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
1854 if (ret < 0)
1855 goto out;
1856
1857 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
1858
1859out:
1860 mutex_unlock(&rdev->mutex);
1861 return ret;
1862}
1863EXPORT_SYMBOL_GPL(regulator_sync_voltage);
1864
414c70cb
LG		 1865static int _regulator_get_voltage(struct regulator_dev *rdev)
1866{
476c2d83
MB		 1867 int sel;
1868
1869 if (rdev->desc->ops->get_voltage_sel) {
1870 sel = rdev->desc->ops->get_voltage_sel(rdev);
1871 if (sel < 0)
1872 return sel;
1873 return rdev->desc->ops->list_voltage(rdev, sel);
1874 }
414c70cb
LG		 1875 if (rdev->desc->ops->get_voltage)
1876 return rdev->desc->ops->get_voltage(rdev);
1877 else
1878 return -EINVAL;
1879}
1880
1881/**
1882 * regulator_get_voltage - get regulator output voltage
1883 * @regulator: regulator source
1884 *
1885 * This returns the current regulator voltage in uV.
1886 *
1887 * NOTE: If the regulator is disabled it will return the voltage value. This
1888 * function should not be used to determine regulator state.
1889 */
1890int regulator_get_voltage(struct regulator *regulator)
1891{
1892 int ret;
1893
1894 mutex_lock(&regulator->rdev->mutex);
1895
1896 ret = _regulator_get_voltage(regulator->rdev);
1897
1898 mutex_unlock(&regulator->rdev->mutex);
1899
1900 return ret;
1901}
1902EXPORT_SYMBOL_GPL(regulator_get_voltage);
1903
1904/**
1905 * regulator_set_current_limit - set regulator output current limit
1906 * @regulator: regulator source
1907 * @min_uA: Minimuum supported current in uA
1908 * @max_uA: Maximum supported current in uA
1909 *
1910 * Sets current sink to the desired output current. This can be set during
1911 * any regulator state. IOW, regulator can be disabled or enabled.
1912 *
1913 * If the regulator is enabled then the current will change to the new value
1914 * immediately otherwise if the regulator is disabled the regulator will
1915 * output at the new current when enabled.
1916 *
1917 * NOTE: Regulator system constraints must be set for this regulator before
1918 * calling this function otherwise this call will fail.
1919 */
1920int regulator_set_current_limit(struct regulator *regulator,
1921 int min_uA, int max_uA)
1922{
1923 struct regulator_dev *rdev = regulator->rdev;
1924 int ret;
1925
1926 mutex_lock(&rdev->mutex);
1927
1928 /* sanity check */
1929 if (!rdev->desc->ops->set_current_limit) {
1930 ret = -EINVAL;
1931 goto out;
1932 }
1933
1934 /* constraints check */
1935 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1936 if (ret < 0)
1937 goto out;
1938
1939 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1940out:
1941 mutex_unlock(&rdev->mutex);
1942 return ret;
1943}
1944EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1945
1946static int _regulator_get_current_limit(struct regulator_dev *rdev)
1947{
1948 int ret;
1949
1950 mutex_lock(&rdev->mutex);
1951
1952 /* sanity check */
1953 if (!rdev->desc->ops->get_current_limit) {
1954 ret = -EINVAL;
1955 goto out;
1956 }
1957
1958 ret = rdev->desc->ops->get_current_limit(rdev);
1959out:
1960 mutex_unlock(&rdev->mutex);
1961 return ret;
1962}
1963
1964/**
1965 * regulator_get_current_limit - get regulator output current
1966 * @regulator: regulator source
1967 *
1968 * This returns the current supplied by the specified current sink in uA.
1969 *
1970 * NOTE: If the regulator is disabled it will return the current value. This
1971 * function should not be used to determine regulator state.
1972 */
1973int regulator_get_current_limit(struct regulator *regulator)
1974{
1975 return _regulator_get_current_limit(regulator->rdev);
1976}
1977EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1978
1979/**
1980 * regulator_set_mode - set regulator operating mode
1981 * @regulator: regulator source
1982 * @mode: operating mode - one of the REGULATOR_MODE constants
1983 *
1984 * Set regulator operating mode to increase regulator efficiency or improve
1985 * regulation performance.
1986 *
1987 * NOTE: Regulator system constraints must be set for this regulator before
1988 * calling this function otherwise this call will fail.
1989 */
1990int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1991{
1992 struct regulator_dev *rdev = regulator->rdev;
1993 int ret;
500b4ac9 1994 int regulator_curr_mode;
414c70cb
LG		 1995
1996 mutex_lock(&rdev->mutex);
1997
1998 /* sanity check */
1999 if (!rdev->desc->ops->set_mode) {
2000 ret = -EINVAL;
2001 goto out;
2002 }
2003
500b4ac9
SI		 2004 /* return if the same mode is requested */
2005 if (rdev->desc->ops->get_mode) {
2006 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2007 if (regulator_curr_mode == mode) {
2008 ret = 0;
2009 goto out;
2010 }
2011 }
2012
414c70cb 2013 /* constraints check */
2c608234 2014 ret = regulator_mode_constrain(rdev, mode);
414c70cb
LG		 2015 if (ret < 0)
2016 goto out;
2017
2018 ret = rdev->desc->ops->set_mode(rdev, mode);
2019out:
2020 mutex_unlock(&rdev->mutex);
2021 return ret;
2022}
2023EXPORT_SYMBOL_GPL(regulator_set_mode);
2024
2025static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2026{
2027 int ret;
2028
2029 mutex_lock(&rdev->mutex);
2030
2031 /* sanity check */
2032 if (!rdev->desc->ops->get_mode) {
2033 ret = -EINVAL;
2034 goto out;
2035 }
2036
2037 ret = rdev->desc->ops->get_mode(rdev);
2038out:
2039 mutex_unlock(&rdev->mutex);
2040 return ret;
2041}
2042
2043/**
2044 * regulator_get_mode - get regulator operating mode
2045 * @regulator: regulator source
2046 *
2047 * Get the current regulator operating mode.
2048 */
2049unsigned int regulator_get_mode(struct regulator *regulator)
2050{
2051 return _regulator_get_mode(regulator->rdev);
2052}
2053EXPORT_SYMBOL_GPL(regulator_get_mode);
2054
2055/**
2056 * regulator_set_optimum_mode - set regulator optimum operating mode
2057 * @regulator: regulator source
2058 * @uA_load: load current
2059 *
2060 * Notifies the regulator core of a new device load. This is then used by
2061 * DRMS (if enabled by constraints) to set the most efficient regulator
2062 * operating mode for the new regulator loading.
2063 *
2064 * Consumer devices notify their supply regulator of the maximum power
2065 * they will require (can be taken from device datasheet in the power
2066 * consumption tables) when they change operational status and hence power
2067 * state. Examples of operational state changes that can affect power
2068 * consumption are :-
2069 *
2070 * o Device is opened / closed.
2071 * o Device I/O is about to begin or has just finished.
2072 * o Device is idling in between work.
2073 *
2074 * This information is also exported via sysfs to userspace.
2075 *
2076 * DRMS will sum the total requested load on the regulator and change
2077 * to the most efficient operating mode if platform constraints allow.
2078 *
2079 * Returns the new regulator mode or error.
2080 */
2081int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2082{
2083 struct regulator_dev *rdev = regulator->rdev;
2084 struct regulator *consumer;
2085 int ret, output_uV, input_uV, total_uA_load = 0;
2086 unsigned int mode;
2087
2088 mutex_lock(&rdev->mutex);
2089
2090 regulator->uA_load = uA_load;
2091 ret = regulator_check_drms(rdev);
2092 if (ret < 0)
2093 goto out;
2094 ret = -EINVAL;
2095
2096 /* sanity check */
2097 if (!rdev->desc->ops->get_optimum_mode)
2098 goto out;
2099
2100 /* get output voltage */
1bf5a1f8 2101 output_uV = _regulator_get_voltage(rdev);
414c70cb 2102 if (output_uV <= 0) {
5da84fd9 2103 rdev_err(rdev, "invalid output voltage found\n");
414c70cb
LG		 2104 goto out;
2105 }
2106
2107 /* get input voltage */
1bf5a1f8
MB		 2108 input_uV = 0;
2109 if (rdev->supply)
2110 input_uV = _regulator_get_voltage(rdev->supply);
2111 if (input_uV <= 0)
414c70cb
LG		 2112 input_uV = rdev->constraints->input_uV;
2113 if (input_uV <= 0) {
5da84fd9 2114 rdev_err(rdev, "invalid input voltage found\n");
414c70cb
LG		 2115 goto out;
2116 }
2117
2118 /* calc total requested load for this regulator */
2119 list_for_each_entry(consumer, &rdev->consumer_list, list)
fa2984d4 2120 total_uA_load += consumer->uA_load;
414c70cb
LG		 2121
2122 mode = rdev->desc->ops->get_optimum_mode(rdev,
2123 input_uV, output_uV,
2124 total_uA_load);
2c608234 2125 ret = regulator_mode_constrain(rdev, &mode);
e573520b 2126 if (ret < 0) {
5da84fd9
JP		 2127 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2128 total_uA_load, input_uV, output_uV);
414c70cb
LG		 2129 goto out;
2130 }
2131
2132 ret = rdev->desc->ops->set_mode(rdev, mode);
e573520b 2133 if (ret < 0) {
5da84fd9 2134 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
414c70cb
LG		 2135 goto out;
2136 }
2137 ret = mode;
2138out:
2139 mutex_unlock(&rdev->mutex);
2140 return ret;
2141}
2142EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2143
2144/**
2145 * regulator_register_notifier - register regulator event notifier
2146 * @regulator: regulator source
69279fb9 2147 * @nb: notifier block
414c70cb
LG		 2148 *
2149 * Register notifier block to receive regulator events.
2150 */
2151int regulator_register_notifier(struct regulator *regulator,
2152 struct notifier_block *nb)
2153{
2154 return blocking_notifier_chain_register(&regulator->rdev->notifier,
2155 nb);
2156}
2157EXPORT_SYMBOL_GPL(regulator_register_notifier);
2158
2159/**
2160 * regulator_unregister_notifier - unregister regulator event notifier
2161 * @regulator: regulator source
69279fb9 2162 * @nb: notifier block
414c70cb
LG		 2163 *
2164 * Unregister regulator event notifier block.
2165 */
2166int regulator_unregister_notifier(struct regulator *regulator,
2167 struct notifier_block *nb)
2168{
2169 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2170 nb);
2171}
2172EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2173
b136fb44
JC		 2174/* notify regulator consumers and downstream regulator consumers.
2175 * Note mutex must be held by caller.
2176 */
414c70cb
LG		 2177static void _notifier_call_chain(struct regulator_dev *rdev,
2178 unsigned long event, void *data)
2179{
2180 struct regulator_dev *_rdev;
2181
2182 /* call rdev chain first */
414c70cb 2183 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
414c70cb
LG		 2184
2185 /* now notify regulator we supply */
b136fb44 2186 list_for_each_entry(_rdev, &rdev->supply_list, slist) {
fa2984d4
SR		 2187 mutex_lock(&_rdev->mutex);
2188 _notifier_call_chain(_rdev, event, data);
2189 mutex_unlock(&_rdev->mutex);
b136fb44 2190 }
414c70cb
LG		 2191}
2192
2193/**
2194 * regulator_bulk_get - get multiple regulator consumers
2195 *
2196 * @dev: Device to supply
2197 * @num_consumers: Number of consumers to register
2198 * @consumers: Configuration of consumers; clients are stored here.
2199 *
2200 * @return 0 on success, an errno on failure.
2201 *
2202 * This helper function allows drivers to get several regulator
2203 * consumers in one operation. If any of the regulators cannot be
2204 * acquired then any regulators that were allocated will be freed
2205 * before returning to the caller.
2206 */
2207int regulator_bulk_get(struct device *dev, int num_consumers,
2208 struct regulator_bulk_data *consumers)
2209{
2210 int i;
2211 int ret;
2212
2213 for (i = 0; i < num_consumers; i++)
2214 consumers[i].consumer = NULL;
2215
2216 for (i = 0; i < num_consumers; i++) {
2217 consumers[i].consumer = regulator_get(dev,
2218 consumers[i].supply);
2219 if (IS_ERR(consumers[i].consumer)) {
414c70cb 2220 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 2221 dev_err(dev, "Failed to get supply '%s': %d\n",
2222 consumers[i].supply, ret);
414c70cb
LG		 2223 consumers[i].consumer = NULL;
2224 goto err;
2225 }
2226 }
2227
2228 return 0;
2229
2230err:
2231 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2232 regulator_put(consumers[i].consumer);
2233
2234 return ret;
2235}
2236EXPORT_SYMBOL_GPL(regulator_bulk_get);
2237
2238/**
2239 * regulator_bulk_enable - enable multiple regulator consumers
2240 *
2241 * @num_consumers: Number of consumers
2242 * @consumers: Consumer data; clients are stored here.
2243 * @return 0 on success, an errno on failure
2244 *
2245 * This convenience API allows consumers to enable multiple regulator
2246 * clients in a single API call. If any consumers cannot be enabled
2247 * then any others that were enabled will be disabled again prior to
2248 * return.
2249 */
2250int regulator_bulk_enable(int num_consumers,
2251 struct regulator_bulk_data *consumers)
2252{
2253 int i;
2254 int ret;
2255
2256 for (i = 0; i < num_consumers; i++) {
2257 ret = regulator_enable(consumers[i].consumer);
2258 if (ret != 0)
2259 goto err;
2260 }
2261
2262 return 0;
2263
2264err:
5da84fd9 2265 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
eb143ac1 2266 for (--i; i >= 0; --i)
414c70cb
LG		 2267 regulator_disable(consumers[i].consumer);
2268
2269 return ret;
2270}
2271EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2272
2273/**
2274 * regulator_bulk_disable - disable multiple regulator consumers
2275 *
2276 * @num_consumers: Number of consumers
2277 * @consumers: Consumer data; clients are stored here.
2278 * @return 0 on success, an errno on failure
2279 *
2280 * This convenience API allows consumers to disable multiple regulator
2281 * clients in a single API call. If any consumers cannot be enabled
2282 * then any others that were disabled will be disabled again prior to
2283 * return.
2284 */
2285int regulator_bulk_disable(int num_consumers,
2286 struct regulator_bulk_data *consumers)
2287{
2288 int i;
2289 int ret;
2290
2291 for (i = 0; i < num_consumers; i++) {
2292 ret = regulator_disable(consumers[i].consumer);
2293 if (ret != 0)
2294 goto err;
2295 }
2296
2297 return 0;
2298
2299err:
5da84fd9 2300 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
eb143ac1 2301 for (--i; i >= 0; --i)
414c70cb
LG		 2302 regulator_enable(consumers[i].consumer);
2303
2304 return ret;
2305}
2306EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2307
2308/**
2309 * regulator_bulk_free - free multiple regulator consumers
2310 *
2311 * @num_consumers: Number of consumers
2312 * @consumers: Consumer data; clients are stored here.
2313 *
2314 * This convenience API allows consumers to free multiple regulator
2315 * clients in a single API call.
2316 */
2317void regulator_bulk_free(int num_consumers,
2318 struct regulator_bulk_data *consumers)
2319{
2320 int i;
2321
2322 for (i = 0; i < num_consumers; i++) {
2323 regulator_put(consumers[i].consumer);
2324 consumers[i].consumer = NULL;
2325 }
2326}
2327EXPORT_SYMBOL_GPL(regulator_bulk_free);
2328
2329/**
2330 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 2331 * @rdev: regulator source
414c70cb 2332 * @event: notifier block
69279fb9 2333 * @data: callback-specific data.
414c70cb
LG		 2334 *
2335 * Called by regulator drivers to notify clients a regulator event has
2336 * occurred. We also notify regulator clients downstream.
b136fb44 2337 * Note lock must be held by caller.
414c70cb
LG		 2338 */
2339int regulator_notifier_call_chain(struct regulator_dev *rdev,
2340 unsigned long event, void *data)
2341{
2342 _notifier_call_chain(rdev, event, data);
2343 return NOTIFY_DONE;
2344
2345}
2346EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2347
be721979
MB		 2348/**
2349 * regulator_mode_to_status - convert a regulator mode into a status
2350 *
2351 * @mode: Mode to convert
2352 *
2353 * Convert a regulator mode into a status.
2354 */
2355int regulator_mode_to_status(unsigned int mode)
2356{
2357 switch (mode) {
2358 case REGULATOR_MODE_FAST:
2359 return REGULATOR_STATUS_FAST;
2360 case REGULATOR_MODE_NORMAL:
2361 return REGULATOR_STATUS_NORMAL;
2362 case REGULATOR_MODE_IDLE:
2363 return REGULATOR_STATUS_IDLE;
2364 case REGULATOR_STATUS_STANDBY:
2365 return REGULATOR_STATUS_STANDBY;
2366 default:
2367 return 0;
2368 }
2369}
2370EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2371
7ad68e2f
DB		 2372/*
2373 * To avoid cluttering sysfs (and memory) with useless state, only
2374 * create attributes that can be meaningfully displayed.
2375 */
2376static int add_regulator_attributes(struct regulator_dev *rdev)
2377{
2378 struct device *dev = &rdev->dev;
2379 struct regulator_ops *ops = rdev->desc->ops;
2380 int status = 0;
2381
2382 /* some attributes need specific methods to be displayed */
476c2d83 2383 if (ops->get_voltage || ops->get_voltage_sel) {
7ad68e2f
DB		 2384 status = device_create_file(dev, &dev_attr_microvolts);
2385 if (status < 0)
2386 return status;
2387 }
2388 if (ops->get_current_limit) {
2389 status = device_create_file(dev, &dev_attr_microamps);
2390 if (status < 0)
2391 return status;
2392 }
2393 if (ops->get_mode) {
2394 status = device_create_file(dev, &dev_attr_opmode);
2395 if (status < 0)
2396 return status;
2397 }
2398 if (ops->is_enabled) {
2399 status = device_create_file(dev, &dev_attr_state);
2400 if (status < 0)
2401 return status;
2402 }
853116a1
DB		 2403 if (ops->get_status) {
2404 status = device_create_file(dev, &dev_attr_status);
2405 if (status < 0)
2406 return status;
2407 }
7ad68e2f
DB		 2408
2409 /* some attributes are type-specific */
2410 if (rdev->desc->type == REGULATOR_CURRENT) {
2411 status = device_create_file(dev, &dev_attr_requested_microamps);
2412 if (status < 0)
2413 return status;
2414 }
2415
2416 /* all the other attributes exist to support constraints;
2417 * don't show them if there are no constraints, or if the
2418 * relevant supporting methods are missing.
2419 */
2420 if (!rdev->constraints)
2421 return status;
2422
2423 /* constraints need specific supporting methods */
e8eef82b 2424 if (ops->set_voltage || ops->set_voltage_sel) {
7ad68e2f
DB		 2425 status = device_create_file(dev, &dev_attr_min_microvolts);
2426 if (status < 0)
2427 return status;
2428 status = device_create_file(dev, &dev_attr_max_microvolts);
2429 if (status < 0)
2430 return status;
2431 }
2432 if (ops->set_current_limit) {
2433 status = device_create_file(dev, &dev_attr_min_microamps);
2434 if (status < 0)
2435 return status;
2436 status = device_create_file(dev, &dev_attr_max_microamps);
2437 if (status < 0)
2438 return status;
2439 }
2440
2441 /* suspend mode constraints need multiple supporting methods */
2442 if (!(ops->set_suspend_enable && ops->set_suspend_disable))
2443 return status;
2444
2445 status = device_create_file(dev, &dev_attr_suspend_standby_state);
2446 if (status < 0)
2447 return status;
2448 status = device_create_file(dev, &dev_attr_suspend_mem_state);
2449 if (status < 0)
2450 return status;
2451 status = device_create_file(dev, &dev_attr_suspend_disk_state);
2452 if (status < 0)
2453 return status;
2454
2455 if (ops->set_suspend_voltage) {
2456 status = device_create_file(dev,
2457 &dev_attr_suspend_standby_microvolts);
2458 if (status < 0)
2459 return status;
2460 status = device_create_file(dev,
2461 &dev_attr_suspend_mem_microvolts);
2462 if (status < 0)
2463 return status;
2464 status = device_create_file(dev,
2465 &dev_attr_suspend_disk_microvolts);
2466 if (status < 0)
2467 return status;
2468 }
2469
2470 if (ops->set_suspend_mode) {
2471 status = device_create_file(dev,
2472 &dev_attr_suspend_standby_mode);
2473 if (status < 0)
2474 return status;
2475 status = device_create_file(dev,
2476 &dev_attr_suspend_mem_mode);
2477 if (status < 0)
2478 return status;
2479 status = device_create_file(dev,
2480 &dev_attr_suspend_disk_mode);
2481 if (status < 0)
2482 return status;
2483 }
2484
2485 return status;
2486}
2487
1130e5b3
MB		 2488static void rdev_init_debugfs(struct regulator_dev *rdev)
2489{
2490#ifdef CONFIG_DEBUG_FS
2491 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
2492 if (IS_ERR(rdev->debugfs) || !rdev->debugfs) {
2493 rdev_warn(rdev, "Failed to create debugfs directory\n");
2494 rdev->debugfs = NULL;
2495 return;
2496 }
2497
2498 debugfs_create_u32("use_count", 0444, rdev->debugfs,
2499 &rdev->use_count);
2500 debugfs_create_u32("open_count", 0444, rdev->debugfs,
2501 &rdev->open_count);
2502#endif
2503}
2504
414c70cb
LG		 2505/**
2506 * regulator_register - register regulator
69279fb9
MB		 2507 * @regulator_desc: regulator to register
2508 * @dev: struct device for the regulator
0527100f 2509 * @init_data: platform provided init data, passed through by driver
69279fb9 2510 * @driver_data: private regulator data
414c70cb
LG		 2511 *
2512 * Called by regulator drivers to register a regulator.
2513 * Returns 0 on success.
2514 */
2515struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
f8c12fe3 2516 struct device *dev, const struct regulator_init_data *init_data,
0527100f 2517 void *driver_data)
414c70cb
LG		 2518{
2519 static atomic_t regulator_no = ATOMIC_INIT(0);
2520 struct regulator_dev *rdev;
a5766f11 2521 int ret, i;
414c70cb
LG		 2522
2523 if (regulator_desc == NULL)
2524 return ERR_PTR(-EINVAL);
2525
2526 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2527 return ERR_PTR(-EINVAL);
2528
cd78dfc6
DL		 2529 if (regulator_desc->type != REGULATOR_VOLTAGE &&
2530 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 2531 return ERR_PTR(-EINVAL);
2532
46fabe1e
MB		 2533 if (!init_data)
2534 return ERR_PTR(-EINVAL);
2535
476c2d83
MB		 2536 /* Only one of each should be implemented */
2537 WARN_ON(regulator_desc->ops->get_voltage &&
2538 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 2539 WARN_ON(regulator_desc->ops->set_voltage &&
2540 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 2541
2542 /* If we're using selectors we must implement list_voltage. */
2543 if (regulator_desc->ops->get_voltage_sel &&
2544 !regulator_desc->ops->list_voltage) {
2545 return ERR_PTR(-EINVAL);
2546 }
e8eef82b
MB		 2547 if (regulator_desc->ops->set_voltage_sel &&
2548 !regulator_desc->ops->list_voltage) {
2549 return ERR_PTR(-EINVAL);
2550 }
476c2d83 2551
414c70cb
LG		 2552 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2553 if (rdev == NULL)
2554 return ERR_PTR(-ENOMEM);
2555
2556 mutex_lock(&regulator_list_mutex);
2557
2558 mutex_init(&rdev->mutex);
a5766f11 2559 rdev->reg_data = driver_data;
414c70cb
LG		 2560 rdev->owner = regulator_desc->owner;
2561 rdev->desc = regulator_desc;
2562 INIT_LIST_HEAD(&rdev->consumer_list);
2563 INIT_LIST_HEAD(&rdev->supply_list);
2564 INIT_LIST_HEAD(&rdev->list);
2565 INIT_LIST_HEAD(&rdev->slist);
2566 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2567
a5766f11
LG		 2568 /* preform any regulator specific init */
2569 if (init_data->regulator_init) {
2570 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 2571 if (ret < 0)
2572 goto clean;
a5766f11
LG		 2573 }
2574
a5766f11 2575 /* register with sysfs */
414c70cb 2576 rdev->dev.class = &regulator_class;
a5766f11 2577 rdev->dev.parent = dev;
812460a9
KS		 2578 dev_set_name(&rdev->dev, "regulator.%d",
2579 atomic_inc_return(&regulator_no) - 1);
a5766f11 2580 ret = device_register(&rdev->dev);
ad7725cb
VK		 2581 if (ret != 0) {
2582 put_device(&rdev->dev);
4fca9545 2583 goto clean;
ad7725cb 2584 }
a5766f11
LG		 2585
2586 dev_set_drvdata(&rdev->dev, rdev);
2587
74f544c1
MR		 2588 /* set regulator constraints */
2589 ret = set_machine_constraints(rdev, &init_data->constraints);
2590 if (ret < 0)
2591 goto scrub;
2592
7ad68e2f
DB		 2593 /* add attributes supported by this regulator */
2594 ret = add_regulator_attributes(rdev);
2595 if (ret < 0)
2596 goto scrub;
2597
a5766f11 2598 /* set supply regulator if it exists */
0178f3e2
MB		 2599 if (init_data->supply_regulator && init_data->supply_regulator_dev) {
2600 dev_err(dev,
2601 "Supply regulator specified by both name and dev\n");
7727da22 2602 ret = -EINVAL;
0178f3e2
MB		 2603 goto scrub;
2604 }
2605
2606 if (init_data->supply_regulator) {
2607 struct regulator_dev *r;
2608 int found = 0;
2609
2610 list_for_each_entry(r, &regulator_list, list) {
2611 if (strcmp(rdev_get_name(r),
2612 init_data->supply_regulator) == 0) {
2613 found = 1;
2614 break;
2615 }
2616 }
2617
2618 if (!found) {
2619 dev_err(dev, "Failed to find supply %s\n",
2620 init_data->supply_regulator);
7727da22 2621 ret = -ENODEV;
0178f3e2
MB		 2622 goto scrub;
2623 }
2624
2625 ret = set_supply(rdev, r);
2626 if (ret < 0)
2627 goto scrub;
2628 }
2629
a5766f11 2630 if (init_data->supply_regulator_dev) {
0178f3e2 2631 dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n");
a5766f11
LG		 2632 ret = set_supply(rdev,
2633 dev_get_drvdata(init_data->supply_regulator_dev));
4fca9545
DB		 2634 if (ret < 0)
2635 goto scrub;
a5766f11
LG		 2636 }
2637
2638 /* add consumers devices */
2639 for (i = 0; i < init_data->num_consumer_supplies; i++) {
2640 ret = set_consumer_device_supply(rdev,
2641 init_data->consumer_supplies[i].dev,
40f9244f 2642 init_data->consumer_supplies[i].dev_name,
a5766f11 2643 init_data->consumer_supplies[i].supply);
23c2f041
MB		 2644 if (ret < 0) {
2645 dev_err(dev, "Failed to set supply %s\n",
2646 init_data->consumer_supplies[i].supply);
d4033b54 2647 goto unset_supplies;
23c2f041 2648 }
414c70cb 2649 }
a5766f11
LG		 2650
2651 list_add(&rdev->list, &regulator_list);
1130e5b3
MB		 2652
2653 rdev_init_debugfs(rdev);
a5766f11 2654out:
414c70cb
LG		 2655 mutex_unlock(&regulator_list_mutex);
2656 return rdev;
4fca9545 2657
d4033b54
JN		 2658unset_supplies:
2659 unset_regulator_supplies(rdev);
2660
4fca9545
DB		 2661scrub:
2662 device_unregister(&rdev->dev);
53032daf
PW		 2663 /* device core frees rdev */
2664 rdev = ERR_PTR(ret);
2665 goto out;
2666
4fca9545
DB		 2667clean:
2668 kfree(rdev);
2669 rdev = ERR_PTR(ret);
2670 goto out;
414c70cb
LG		 2671}
2672EXPORT_SYMBOL_GPL(regulator_register);
2673
2674/**
2675 * regulator_unregister - unregister regulator
69279fb9 2676 * @rdev: regulator to unregister
414c70cb
LG		 2677 *
2678 * Called by regulator drivers to unregister a regulator.
2679 */
2680void regulator_unregister(struct regulator_dev *rdev)
2681{
2682 if (rdev == NULL)
2683 return;
2684
2685 mutex_lock(&regulator_list_mutex);
1130e5b3
MB		 2686#ifdef CONFIG_DEBUG_FS
2687 debugfs_remove_recursive(rdev->debugfs);
2688#endif
6bf87d17 2689 WARN_ON(rdev->open_count);
0f1d747b 2690 unset_regulator_supplies(rdev);
414c70cb
LG		 2691 list_del(&rdev->list);
2692 if (rdev->supply)
2693 sysfs_remove_link(&rdev->dev.kobj, "supply");
2694 device_unregister(&rdev->dev);
f8c12fe3 2695 kfree(rdev->constraints);
414c70cb
LG		 2696 mutex_unlock(&regulator_list_mutex);
2697}
2698EXPORT_SYMBOL_GPL(regulator_unregister);
2699
414c70cb 2700/**
cf7bbcdf 2701 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 2702 * @state: system suspend state
2703 *
2704 * Configure each regulator with it's suspend operating parameters for state.
2705 * This will usually be called by machine suspend code prior to supending.
2706 */
2707int regulator_suspend_prepare(suspend_state_t state)
2708{
2709 struct regulator_dev *rdev;
2710 int ret = 0;
2711
2712 /* ON is handled by regulator active state */
2713 if (state == PM_SUSPEND_ON)
2714 return -EINVAL;
2715
2716 mutex_lock(&regulator_list_mutex);
2717 list_for_each_entry(rdev, &regulator_list, list) {
2718
2719 mutex_lock(&rdev->mutex);
2720 ret = suspend_prepare(rdev, state);
2721 mutex_unlock(&rdev->mutex);
2722
2723 if (ret < 0) {
5da84fd9 2724 rdev_err(rdev, "failed to prepare\n");
414c70cb
LG		 2725 goto out;
2726 }
2727 }
2728out:
2729 mutex_unlock(&regulator_list_mutex);
2730 return ret;
2731}
2732EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2733
7a32b589
MH		 2734/**
2735 * regulator_suspend_finish - resume regulators from system wide suspend
2736 *
2737 * Turn on regulators that might be turned off by regulator_suspend_prepare
2738 * and that should be turned on according to the regulators properties.
2739 */
2740int regulator_suspend_finish(void)
2741{
2742 struct regulator_dev *rdev;
2743 int ret = 0, error;
2744
2745 mutex_lock(&regulator_list_mutex);
2746 list_for_each_entry(rdev, &regulator_list, list) {
2747 struct regulator_ops *ops = rdev->desc->ops;
2748
2749 mutex_lock(&rdev->mutex);
2750 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
2751 ops->enable) {
2752 error = ops->enable(rdev);
2753 if (error)
2754 ret = error;
2755 } else {
2756 if (!has_full_constraints)
2757 goto unlock;
2758 if (!ops->disable)
2759 goto unlock;
2760 if (ops->is_enabled && !ops->is_enabled(rdev))
2761 goto unlock;
2762
2763 error = ops->disable(rdev);
2764 if (error)
2765 ret = error;
2766 }
2767unlock:
2768 mutex_unlock(&rdev->mutex);
2769 }
2770 mutex_unlock(&regulator_list_mutex);
2771 return ret;
2772}
2773EXPORT_SYMBOL_GPL(regulator_suspend_finish);
2774
ca725561
MB		 2775/**
2776 * regulator_has_full_constraints - the system has fully specified constraints
2777 *
2778 * Calling this function will cause the regulator API to disable all
2779 * regulators which have a zero use count and don't have an always_on
2780 * constraint in a late_initcall.
2781 *
2782 * The intention is that this will become the default behaviour in a
2783 * future kernel release so users are encouraged to use this facility
2784 * now.
2785 */
2786void regulator_has_full_constraints(void)
2787{
2788 has_full_constraints = 1;
2789}
2790EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
2791
688fe99a
MB		 2792/**
2793 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
2794 *
2795 * Calling this function will cause the regulator API to provide a
2796 * dummy regulator to consumers if no physical regulator is found,
2797 * allowing most consumers to proceed as though a regulator were
2798 * configured. This allows systems such as those with software
2799 * controllable regulators for the CPU core only to be brought up more
2800 * readily.
2801 */
2802void regulator_use_dummy_regulator(void)
2803{
2804 board_wants_dummy_regulator = true;
2805}
2806EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
2807
414c70cb
LG		 2808/**
2809 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 2810 * @rdev: regulator
414c70cb
LG		 2811 *
2812 * Get rdev regulator driver private data. This call can be used in the
2813 * regulator driver context.
2814 */
2815void *rdev_get_drvdata(struct regulator_dev *rdev)
2816{
2817 return rdev->reg_data;
2818}
2819EXPORT_SYMBOL_GPL(rdev_get_drvdata);
2820
2821/**
2822 * regulator_get_drvdata - get regulator driver data
2823 * @regulator: regulator
2824 *
2825 * Get regulator driver private data. This call can be used in the consumer
2826 * driver context when non API regulator specific functions need to be called.
2827 */
2828void *regulator_get_drvdata(struct regulator *regulator)
2829{
2830 return regulator->rdev->reg_data;
2831}
2832EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2833
2834/**
2835 * regulator_set_drvdata - set regulator driver data
2836 * @regulator: regulator
2837 * @data: data
2838 */
2839void regulator_set_drvdata(struct regulator *regulator, void *data)
2840{
2841 regulator->rdev->reg_data = data;
2842}
2843EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2844
2845/**
2846 * regulator_get_id - get regulator ID
69279fb9 2847 * @rdev: regulator
414c70cb
LG		 2848 */
2849int rdev_get_id(struct regulator_dev *rdev)
2850{
2851 return rdev->desc->id;
2852}
2853EXPORT_SYMBOL_GPL(rdev_get_id);
2854
a5766f11
LG		 2855struct device *rdev_get_dev(struct regulator_dev *rdev)
2856{
2857 return &rdev->dev;
2858}
2859EXPORT_SYMBOL_GPL(rdev_get_dev);
2860
2861void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2862{
2863 return reg_init_data->driver_data;
2864}
2865EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2866
414c70cb
LG		 2867static int __init regulator_init(void)
2868{
34abbd68
MB		 2869 int ret;
2870
34abbd68
MB		 2871 ret = class_register(&regulator_class);
2872
1130e5b3
MB		 2873#ifdef CONFIG_DEBUG_FS
2874 debugfs_root = debugfs_create_dir("regulator", NULL);
2875 if (IS_ERR(debugfs_root) || !debugfs_root) {
2876 pr_warn("regulator: Failed to create debugfs directory\n");
2877 debugfs_root = NULL;
2878 }
2879#endif
2880
34abbd68
MB		 2881 regulator_dummy_init();
2882
2883 return ret;
414c70cb
LG		 2884}
2885
2886/* init early to allow our consumers to complete system booting */
2887core_initcall(regulator_init);
ca725561
MB		 2888
2889static int __init regulator_init_complete(void)
2890{
2891 struct regulator_dev *rdev;
2892 struct regulator_ops *ops;
2893 struct regulation_constraints *c;
2894 int enabled, ret;
ca725561
MB		 2895
2896 mutex_lock(&regulator_list_mutex);
2897
2898 /* If we have a full configuration then disable any regulators
2899 * which are not in use or always_on. This will become the
2900 * default behaviour in the future.
2901 */
2902 list_for_each_entry(rdev, &regulator_list, list) {
2903 ops = rdev->desc->ops;
2904 c = rdev->constraints;
2905
f25e0b4f 2906 if (!ops->disable || (c && c->always_on))
ca725561
MB		 2907 continue;
2908
2909 mutex_lock(&rdev->mutex);
2910
2911 if (rdev->use_count)
2912 goto unlock;
2913
2914 /* If we can't read the status assume it's on. */
2915 if (ops->is_enabled)
2916 enabled = ops->is_enabled(rdev);
2917 else
2918 enabled = 1;
2919
2920 if (!enabled)
2921 goto unlock;
2922
2923 if (has_full_constraints) {
2924 /* We log since this may kill the system if it
2925 * goes wrong. */
5da84fd9 2926 rdev_info(rdev, "disabling\n");
ca725561
MB		 2927 ret = ops->disable(rdev);
2928 if (ret != 0) {
5da84fd9 2929 rdev_err(rdev, "couldn't disable: %d\n", ret);
ca725561
MB		 2930 }
2931 } else {
2932 /* The intention is that in future we will
2933 * assume that full constraints are provided
2934 * so warn even if we aren't going to do
2935 * anything here.
2936 */
5da84fd9 2937 rdev_warn(rdev, "incomplete constraints, leaving on\n");
ca725561
MB		 2938 }
2939
2940unlock:
2941 mutex_unlock(&rdev->mutex);
2942 }
2943
2944 mutex_unlock(&regulator_list_mutex);
2945
2946 return 0;
2947}
2948late_initcall(regulator_init_complete);
kernel source for telekom puls (alcatel/mediatek)