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regulator: Report actual configured voltage to set_voltage()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / regulator / core.c
CommitLineData
414c70cb
LG		 1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
a5766f11 5 * Copyright 2008 SlimLogic Ltd.
414c70cb 6 *
a5766f11 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
414c70cb
LG		 8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/device.h>
5a0e3ad6 19#include <linux/slab.h>
414c70cb
LG		 20#include <linux/err.h>
21#include <linux/mutex.h>
22#include <linux/suspend.h>
31aae2be 23#include <linux/delay.h>
414c70cb
LG		 24#include <linux/regulator/consumer.h>
25#include <linux/regulator/driver.h>
26#include <linux/regulator/machine.h>
27
34abbd68
MB		 28#include "dummy.h"
29
414c70cb
LG		 30#define REGULATOR_VERSION "0.5"
31
32static DEFINE_MUTEX(regulator_list_mutex);
33static LIST_HEAD(regulator_list);
34static LIST_HEAD(regulator_map_list);
ca725561 35static int has_full_constraints;
688fe99a 36static bool board_wants_dummy_regulator;
414c70cb 37
8dc5390d 38/*
414c70cb
LG		 39 * struct regulator_map
40 *
41 * Used to provide symbolic supply names to devices.
42 */
43struct regulator_map {
44 struct list_head list;
40f9244f 45 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 46 const char *supply;
a5766f11 47 struct regulator_dev *regulator;
414c70cb
LG		 48};
49
414c70cb
LG		 50/*
51 * struct regulator
52 *
53 * One for each consumer device.
54 */
55struct regulator {
56 struct device *dev;
57 struct list_head list;
58 int uA_load;
59 int min_uV;
60 int max_uV;
414c70cb
LG		 61 char *supply_name;
62 struct device_attribute dev_attr;
63 struct regulator_dev *rdev;
64};
65
66static int _regulator_is_enabled(struct regulator_dev *rdev);
8cbf811d
JC		 67static int _regulator_disable(struct regulator_dev *rdev,
68 struct regulator_dev **supply_rdev_ptr);
414c70cb
LG		 69static int _regulator_get_voltage(struct regulator_dev *rdev);
70static int _regulator_get_current_limit(struct regulator_dev *rdev);
71static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
72static void _notifier_call_chain(struct regulator_dev *rdev,
73 unsigned long event, void *data);
74
1083c393
MB		 75static const char *rdev_get_name(struct regulator_dev *rdev)
76{
77 if (rdev->constraints && rdev->constraints->name)
78 return rdev->constraints->name;
79 else if (rdev->desc->name)
80 return rdev->desc->name;
81 else
82 return "";
83}
84
414c70cb
LG		 85/* gets the regulator for a given consumer device */
86static struct regulator *get_device_regulator(struct device *dev)
87{
88 struct regulator *regulator = NULL;
89 struct regulator_dev *rdev;
90
91 mutex_lock(&regulator_list_mutex);
92 list_for_each_entry(rdev, &regulator_list, list) {
93 mutex_lock(&rdev->mutex);
94 list_for_each_entry(regulator, &rdev->consumer_list, list) {
95 if (regulator->dev == dev) {
96 mutex_unlock(&rdev->mutex);
97 mutex_unlock(&regulator_list_mutex);
98 return regulator;
99 }
100 }
101 mutex_unlock(&rdev->mutex);
102 }
103 mutex_unlock(&regulator_list_mutex);
104 return NULL;
105}
106
107/* Platform voltage constraint check */
108static int regulator_check_voltage(struct regulator_dev *rdev,
109 int *min_uV, int *max_uV)
110{
111 BUG_ON(*min_uV > *max_uV);
112
113 if (!rdev->constraints) {
114 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
1083c393 115 rdev_get_name(rdev));
414c70cb
LG		 116 return -ENODEV;
117 }
118 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
119 printk(KERN_ERR "%s: operation not allowed for %s\n",
1083c393 120 __func__, rdev_get_name(rdev));
414c70cb
LG		 121 return -EPERM;
122 }
123
124 if (*max_uV > rdev->constraints->max_uV)
125 *max_uV = rdev->constraints->max_uV;
126 if (*min_uV < rdev->constraints->min_uV)
127 *min_uV = rdev->constraints->min_uV;
128
129 if (*min_uV > *max_uV)
130 return -EINVAL;
131
132 return 0;
133}
134
135/* current constraint check */
136static int regulator_check_current_limit(struct regulator_dev *rdev,
137 int *min_uA, int *max_uA)
138{
139 BUG_ON(*min_uA > *max_uA);
140
141 if (!rdev->constraints) {
142 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
1083c393 143 rdev_get_name(rdev));
414c70cb
LG		 144 return -ENODEV;
145 }
146 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
147 printk(KERN_ERR "%s: operation not allowed for %s\n",
1083c393 148 __func__, rdev_get_name(rdev));
414c70cb
LG		 149 return -EPERM;
150 }
151
152 if (*max_uA > rdev->constraints->max_uA)
153 *max_uA = rdev->constraints->max_uA;
154 if (*min_uA < rdev->constraints->min_uA)
155 *min_uA = rdev->constraints->min_uA;
156
157 if (*min_uA > *max_uA)
158 return -EINVAL;
159
160 return 0;
161}
162
163/* operating mode constraint check */
164static int regulator_check_mode(struct regulator_dev *rdev, int mode)
165{
e573520b
DB		 166 switch (mode) {
167 case REGULATOR_MODE_FAST:
168 case REGULATOR_MODE_NORMAL:
169 case REGULATOR_MODE_IDLE:
170 case REGULATOR_MODE_STANDBY:
171 break;
172 default:
173 return -EINVAL;
174 }
175
414c70cb
LG		 176 if (!rdev->constraints) {
177 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
1083c393 178 rdev_get_name(rdev));
414c70cb
LG		 179 return -ENODEV;
180 }
181 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
182 printk(KERN_ERR "%s: operation not allowed for %s\n",
1083c393 183 __func__, rdev_get_name(rdev));
414c70cb
LG		 184 return -EPERM;
185 }
186 if (!(rdev->constraints->valid_modes_mask & mode)) {
187 printk(KERN_ERR "%s: invalid mode %x for %s\n",
1083c393 188 __func__, mode, rdev_get_name(rdev));
414c70cb
LG		 189 return -EINVAL;
190 }
191 return 0;
192}
193
194/* dynamic regulator mode switching constraint check */
195static int regulator_check_drms(struct regulator_dev *rdev)
196{
197 if (!rdev->constraints) {
198 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
1083c393 199 rdev_get_name(rdev));
414c70cb
LG		 200 return -ENODEV;
201 }
202 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
203 printk(KERN_ERR "%s: operation not allowed for %s\n",
1083c393 204 __func__, rdev_get_name(rdev));
414c70cb
LG		 205 return -EPERM;
206 }
207 return 0;
208}
209
210static ssize_t device_requested_uA_show(struct device *dev,
211 struct device_attribute *attr, char *buf)
212{
213 struct regulator *regulator;
214
215 regulator = get_device_regulator(dev);
216 if (regulator == NULL)
217 return 0;
218
219 return sprintf(buf, "%d\n", regulator->uA_load);
220}
221
222static ssize_t regulator_uV_show(struct device *dev,
223 struct device_attribute *attr, char *buf)
224{
a5766f11 225 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 226 ssize_t ret;
227
228 mutex_lock(&rdev->mutex);
229 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
230 mutex_unlock(&rdev->mutex);
231
232 return ret;
233}
7ad68e2f 234static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 235
236static ssize_t regulator_uA_show(struct device *dev,
237 struct device_attribute *attr, char *buf)
238{
a5766f11 239 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 240
241 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
242}
7ad68e2f 243static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 244
bc558a60
MB		 245static ssize_t regulator_name_show(struct device *dev,
246 struct device_attribute *attr, char *buf)
247{
248 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 249
1083c393 250 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60
MB		 251}
252
4fca9545 253static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 254{
414c70cb
LG		 255 switch (mode) {
256 case REGULATOR_MODE_FAST:
257 return sprintf(buf, "fast\n");
258 case REGULATOR_MODE_NORMAL:
259 return sprintf(buf, "normal\n");
260 case REGULATOR_MODE_IDLE:
261 return sprintf(buf, "idle\n");
262 case REGULATOR_MODE_STANDBY:
263 return sprintf(buf, "standby\n");
264 }
265 return sprintf(buf, "unknown\n");
266}
267
4fca9545
DB		 268static ssize_t regulator_opmode_show(struct device *dev,
269 struct device_attribute *attr, char *buf)
414c70cb 270{
a5766f11 271 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 272
4fca9545
DB		 273 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
274}
7ad68e2f 275static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 276
277static ssize_t regulator_print_state(char *buf, int state)
278{
414c70cb
LG		 279 if (state > 0)
280 return sprintf(buf, "enabled\n");
281 else if (state == 0)
282 return sprintf(buf, "disabled\n");
283 else
284 return sprintf(buf, "unknown\n");
285}
286
4fca9545
DB		 287static ssize_t regulator_state_show(struct device *dev,
288 struct device_attribute *attr, char *buf)
289{
290 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 291 ssize_t ret;
292
293 mutex_lock(&rdev->mutex);
294 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
295 mutex_unlock(&rdev->mutex);
4fca9545 296
9332546f 297 return ret;
4fca9545 298}
7ad68e2f 299static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 300
853116a1
DB		 301static ssize_t regulator_status_show(struct device *dev,
302 struct device_attribute *attr, char *buf)
303{
304 struct regulator_dev *rdev = dev_get_drvdata(dev);
305 int status;
306 char *label;
307
308 status = rdev->desc->ops->get_status(rdev);
309 if (status < 0)
310 return status;
311
312 switch (status) {
313 case REGULATOR_STATUS_OFF:
314 label = "off";
315 break;
316 case REGULATOR_STATUS_ON:
317 label = "on";
318 break;
319 case REGULATOR_STATUS_ERROR:
320 label = "error";
321 break;
322 case REGULATOR_STATUS_FAST:
323 label = "fast";
324 break;
325 case REGULATOR_STATUS_NORMAL:
326 label = "normal";
327 break;
328 case REGULATOR_STATUS_IDLE:
329 label = "idle";
330 break;
331 case REGULATOR_STATUS_STANDBY:
332 label = "standby";
333 break;
334 default:
335 return -ERANGE;
336 }
337
338 return sprintf(buf, "%s\n", label);
339}
340static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
341
414c70cb
LG		 342static ssize_t regulator_min_uA_show(struct device *dev,
343 struct device_attribute *attr, char *buf)
344{
a5766f11 345 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 346
347 if (!rdev->constraints)
348 return sprintf(buf, "constraint not defined\n");
349
350 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
351}
7ad68e2f 352static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 353
354static ssize_t regulator_max_uA_show(struct device *dev,
355 struct device_attribute *attr, char *buf)
356{
a5766f11 357 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 358
359 if (!rdev->constraints)
360 return sprintf(buf, "constraint not defined\n");
361
362 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
363}
7ad68e2f 364static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 365
366static ssize_t regulator_min_uV_show(struct device *dev,
367 struct device_attribute *attr, char *buf)
368{
a5766f11 369 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 370
371 if (!rdev->constraints)
372 return sprintf(buf, "constraint not defined\n");
373
374 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
375}
7ad68e2f 376static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 377
378static ssize_t regulator_max_uV_show(struct device *dev,
379 struct device_attribute *attr, char *buf)
380{
a5766f11 381 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 382
383 if (!rdev->constraints)
384 return sprintf(buf, "constraint not defined\n");
385
386 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
387}
7ad68e2f 388static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 389
390static ssize_t regulator_total_uA_show(struct device *dev,
391 struct device_attribute *attr, char *buf)
392{
a5766f11 393 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 394 struct regulator *regulator;
395 int uA = 0;
396
397 mutex_lock(&rdev->mutex);
398 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 399 uA += regulator->uA_load;
414c70cb
LG		 400 mutex_unlock(&rdev->mutex);
401 return sprintf(buf, "%d\n", uA);
402}
7ad68e2f 403static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb
LG		 404
405static ssize_t regulator_num_users_show(struct device *dev,
406 struct device_attribute *attr, char *buf)
407{
a5766f11 408 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 409 return sprintf(buf, "%d\n", rdev->use_count);
410}
411
412static ssize_t regulator_type_show(struct device *dev,
413 struct device_attribute *attr, char *buf)
414{
a5766f11 415 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 416
417 switch (rdev->desc->type) {
418 case REGULATOR_VOLTAGE:
419 return sprintf(buf, "voltage\n");
420 case REGULATOR_CURRENT:
421 return sprintf(buf, "current\n");
422 }
423 return sprintf(buf, "unknown\n");
424}
425
426static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
427 struct device_attribute *attr, char *buf)
428{
a5766f11 429 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 430
414c70cb
LG		 431 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
432}
7ad68e2f
DB		 433static DEVICE_ATTR(suspend_mem_microvolts, 0444,
434 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 435
436static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
437 struct device_attribute *attr, char *buf)
438{
a5766f11 439 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 440
414c70cb
LG		 441 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
442}
7ad68e2f
DB		 443static DEVICE_ATTR(suspend_disk_microvolts, 0444,
444 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 445
446static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
447 struct device_attribute *attr, char *buf)
448{
a5766f11 449 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 450
414c70cb
LG		 451 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
452}
7ad68e2f
DB		 453static DEVICE_ATTR(suspend_standby_microvolts, 0444,
454 regulator_suspend_standby_uV_show, NULL);
414c70cb 455
414c70cb
LG		 456static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
457 struct device_attribute *attr, char *buf)
458{
a5766f11 459 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 460
4fca9545
DB		 461 return regulator_print_opmode(buf,
462 rdev->constraints->state_mem.mode);
414c70cb 463}
7ad68e2f
DB		 464static DEVICE_ATTR(suspend_mem_mode, 0444,
465 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 466
467static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
468 struct device_attribute *attr, char *buf)
469{
a5766f11 470 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 471
4fca9545
DB		 472 return regulator_print_opmode(buf,
473 rdev->constraints->state_disk.mode);
414c70cb 474}
7ad68e2f
DB		 475static DEVICE_ATTR(suspend_disk_mode, 0444,
476 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 477
478static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
480{
a5766f11 481 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 482
4fca9545
DB		 483 return regulator_print_opmode(buf,
484 rdev->constraints->state_standby.mode);
414c70cb 485}
7ad68e2f
DB		 486static DEVICE_ATTR(suspend_standby_mode, 0444,
487 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 488
489static ssize_t regulator_suspend_mem_state_show(struct device *dev,
490 struct device_attribute *attr, char *buf)
491{
a5766f11 492 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 493
4fca9545
DB		 494 return regulator_print_state(buf,
495 rdev->constraints->state_mem.enabled);
414c70cb 496}
7ad68e2f
DB		 497static DEVICE_ATTR(suspend_mem_state, 0444,
498 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 499
500static ssize_t regulator_suspend_disk_state_show(struct device *dev,
501 struct device_attribute *attr, char *buf)
502{
a5766f11 503 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 504
4fca9545
DB		 505 return regulator_print_state(buf,
506 rdev->constraints->state_disk.enabled);
414c70cb 507}
7ad68e2f
DB		 508static DEVICE_ATTR(suspend_disk_state, 0444,
509 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 510
511static ssize_t regulator_suspend_standby_state_show(struct device *dev,
512 struct device_attribute *attr, char *buf)
513{
a5766f11 514 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 515
4fca9545
DB		 516 return regulator_print_state(buf,
517 rdev->constraints->state_standby.enabled);
414c70cb 518}
7ad68e2f
DB		 519static DEVICE_ATTR(suspend_standby_state, 0444,
520 regulator_suspend_standby_state_show, NULL);
521
bc558a60 522
7ad68e2f
DB		 523/*
524 * These are the only attributes are present for all regulators.
525 * Other attributes are a function of regulator functionality.
526 */
414c70cb 527static struct device_attribute regulator_dev_attrs[] = {
bc558a60 528 __ATTR(name, 0444, regulator_name_show, NULL),
414c70cb
LG		 529 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
530 __ATTR(type, 0444, regulator_type_show, NULL),
414c70cb
LG		 531 __ATTR_NULL,
532};
533
534static void regulator_dev_release(struct device *dev)
535{
a5766f11 536 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 537 kfree(rdev);
538}
539
540static struct class regulator_class = {
541 .name = "regulator",
542 .dev_release = regulator_dev_release,
543 .dev_attrs = regulator_dev_attrs,
544};
545
546/* Calculate the new optimum regulator operating mode based on the new total
547 * consumer load. All locks held by caller */
548static void drms_uA_update(struct regulator_dev *rdev)
549{
550 struct regulator *sibling;
551 int current_uA = 0, output_uV, input_uV, err;
552 unsigned int mode;
553
554 err = regulator_check_drms(rdev);
555 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
036de8ef
DC		 556 !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode)
557 return;
414c70cb
LG		 558
559 /* get output voltage */
560 output_uV = rdev->desc->ops->get_voltage(rdev);
561 if (output_uV <= 0)
562 return;
563
564 /* get input voltage */
565 if (rdev->supply && rdev->supply->desc->ops->get_voltage)
566 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
567 else
568 input_uV = rdev->constraints->input_uV;
569 if (input_uV <= 0)
570 return;
571
572 /* calc total requested load */
573 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 574 current_uA += sibling->uA_load;
414c70cb
LG		 575
576 /* now get the optimum mode for our new total regulator load */
577 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
578 output_uV, current_uA);
579
580 /* check the new mode is allowed */
581 err = regulator_check_mode(rdev, mode);
582 if (err == 0)
583 rdev->desc->ops->set_mode(rdev, mode);
584}
585
586static int suspend_set_state(struct regulator_dev *rdev,
587 struct regulator_state *rstate)
588{
589 int ret = 0;
638f85c5
MB		 590 bool can_set_state;
591
592 can_set_state = rdev->desc->ops->set_suspend_enable &&
593 rdev->desc->ops->set_suspend_disable;
594
595 /* If we have no suspend mode configration don't set anything;
596 * only warn if the driver actually makes the suspend mode
597 * configurable.
598 */
599 if (!rstate->enabled && !rstate->disabled) {
600 if (can_set_state)
601 printk(KERN_WARNING "%s: No configuration for %s\n",
602 __func__, rdev_get_name(rdev));
603 return 0;
604 }
605
606 if (rstate->enabled && rstate->disabled) {
607 printk(KERN_ERR "%s: invalid configuration for %s\n",
608 __func__, rdev_get_name(rdev));
609 return -EINVAL;
610 }
414c70cb 611
638f85c5 612 if (!can_set_state) {
a5766f11
LG		 613 printk(KERN_ERR "%s: no way to set suspend state\n",
614 __func__);
414c70cb 615 return -EINVAL;
a5766f11 616 }
414c70cb
LG		 617
618 if (rstate->enabled)
619 ret = rdev->desc->ops->set_suspend_enable(rdev);
620 else
621 ret = rdev->desc->ops->set_suspend_disable(rdev);
622 if (ret < 0) {
623 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__);
624 return ret;
625 }
626
627 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
628 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
629 if (ret < 0) {
630 printk(KERN_ERR "%s: failed to set voltage\n",
631 __func__);
632 return ret;
633 }
634 }
635
636 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
637 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
638 if (ret < 0) {
639 printk(KERN_ERR "%s: failed to set mode\n", __func__);
640 return ret;
641 }
642 }
643 return ret;
644}
645
646/* locks held by caller */
647static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
648{
649 if (!rdev->constraints)
650 return -EINVAL;
651
652 switch (state) {
653 case PM_SUSPEND_STANDBY:
654 return suspend_set_state(rdev,
655 &rdev->constraints->state_standby);
656 case PM_SUSPEND_MEM:
657 return suspend_set_state(rdev,
658 &rdev->constraints->state_mem);
659 case PM_SUSPEND_MAX:
660 return suspend_set_state(rdev,
661 &rdev->constraints->state_disk);
662 default:
663 return -EINVAL;
664 }
665}
666
667static void print_constraints(struct regulator_dev *rdev)
668{
669 struct regulation_constraints *constraints = rdev->constraints;
973e9a27 670 char buf[80] = "";
8f031b48
MB		 671 int count = 0;
672 int ret;
414c70cb 673
8f031b48 674 if (constraints->min_uV && constraints->max_uV) {
414c70cb 675 if (constraints->min_uV == constraints->max_uV)
8f031b48
MB		 676 count += sprintf(buf + count, "%d mV ",
677 constraints->min_uV / 1000);
414c70cb 678 else
8f031b48
MB		 679 count += sprintf(buf + count, "%d <--> %d mV ",
680 constraints->min_uV / 1000,
681 constraints->max_uV / 1000);
682 }
683
684 if (!constraints->min_uV ||
685 constraints->min_uV != constraints->max_uV) {
686 ret = _regulator_get_voltage(rdev);
687 if (ret > 0)
688 count += sprintf(buf + count, "at %d mV ", ret / 1000);
689 }
690
691 if (constraints->min_uA && constraints->max_uA) {
414c70cb 692 if (constraints->min_uA == constraints->max_uA)
8f031b48
MB		 693 count += sprintf(buf + count, "%d mA ",
694 constraints->min_uA / 1000);
414c70cb 695 else
8f031b48
MB		 696 count += sprintf(buf + count, "%d <--> %d mA ",
697 constraints->min_uA / 1000,
698 constraints->max_uA / 1000);
699 }
700
701 if (!constraints->min_uA ||
702 constraints->min_uA != constraints->max_uA) {
703 ret = _regulator_get_current_limit(rdev);
704 if (ret > 0)
e4a6376b 705 count += sprintf(buf + count, "at %d mA ", ret / 1000);
414c70cb 706 }
8f031b48 707
414c70cb
LG		 708 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
709 count += sprintf(buf + count, "fast ");
710 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
711 count += sprintf(buf + count, "normal ");
712 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
713 count += sprintf(buf + count, "idle ");
714 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
715 count += sprintf(buf + count, "standby");
716
1083c393 717 printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf);
414c70cb
LG		 718}
719
e79055d6 720static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 721 struct regulation_constraints *constraints)
a5766f11 722{
e5fda26c 723 struct regulator_ops *ops = rdev->desc->ops;
1083c393 724 const char *name = rdev_get_name(rdev);
af5866c9 725 int ret;
3a93f2a9 726 unsigned selector;
af5866c9
MB		 727
728 /* do we need to apply the constraint voltage */
729 if (rdev->constraints->apply_uV &&
730 rdev->constraints->min_uV == rdev->constraints->max_uV &&
731 ops->set_voltage) {
732 ret = ops->set_voltage(rdev,
3a93f2a9
MB		 733 rdev->constraints->min_uV,
734 rdev->constraints->max_uV,
735 &selector);
af5866c9
MB		 736 if (ret < 0) {
737 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n",
738 __func__,
739 rdev->constraints->min_uV, name);
740 rdev->constraints = NULL;
741 return ret;
742 }
743 }
e06f5b4f 744
4367cfdc
DB		 745 /* constrain machine-level voltage specs to fit
746 * the actual range supported by this regulator.
747 */
748 if (ops->list_voltage && rdev->desc->n_voltages) {
749 int count = rdev->desc->n_voltages;
750 int i;
751 int min_uV = INT_MAX;
752 int max_uV = INT_MIN;
753 int cmin = constraints->min_uV;
754 int cmax = constraints->max_uV;
755
3e590918
MB		 756 /* it's safe to autoconfigure fixed-voltage supplies
757 and the constraints are used by list_voltage. */
4367cfdc 758 if (count == 1 && !cmin) {
3e590918 759 cmin = 1;
4367cfdc 760 cmax = INT_MAX;
3e590918
MB		 761 constraints->min_uV = cmin;
762 constraints->max_uV = cmax;
4367cfdc
DB		 763 }
764
3e2b9abd
MB		 765 /* voltage constraints are optional */
766 if ((cmin == 0) && (cmax == 0))
e79055d6 767 return 0;
3e2b9abd 768
4367cfdc 769 /* else require explicit machine-level constraints */
3e2b9abd 770 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
4367cfdc
DB		 771 pr_err("%s: %s '%s' voltage constraints\n",
772 __func__, "invalid", name);
e79055d6 773 return -EINVAL;
4367cfdc
DB		 774 }
775
776 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
777 for (i = 0; i < count; i++) {
778 int value;
779
780 value = ops->list_voltage(rdev, i);
781 if (value <= 0)
782 continue;
783
784 /* maybe adjust [min_uV..max_uV] */
785 if (value >= cmin && value < min_uV)
786 min_uV = value;
787 if (value <= cmax && value > max_uV)
788 max_uV = value;
789 }
790
791 /* final: [min_uV..max_uV] valid iff constraints valid */
792 if (max_uV < min_uV) {
793 pr_err("%s: %s '%s' voltage constraints\n",
794 __func__, "unsupportable", name);
e79055d6 795 return -EINVAL;
4367cfdc
DB		 796 }
797
798 /* use regulator's subset of machine constraints */
799 if (constraints->min_uV < min_uV) {
800 pr_debug("%s: override '%s' %s, %d -> %d\n",
801 __func__, name, "min_uV",
802 constraints->min_uV, min_uV);
803 constraints->min_uV = min_uV;
804 }
805 if (constraints->max_uV > max_uV) {
806 pr_debug("%s: override '%s' %s, %d -> %d\n",
807 __func__, name, "max_uV",
808 constraints->max_uV, max_uV);
809 constraints->max_uV = max_uV;
810 }
811 }
812
e79055d6
MB		 813 return 0;
814}
815
816/**
817 * set_machine_constraints - sets regulator constraints
818 * @rdev: regulator source
819 * @constraints: constraints to apply
820 *
821 * Allows platform initialisation code to define and constrain
822 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
823 * Constraints *must* be set by platform code in order for some
824 * regulator operations to proceed i.e. set_voltage, set_current_limit,
825 * set_mode.
826 */
827static int set_machine_constraints(struct regulator_dev *rdev,
828 struct regulation_constraints *constraints)
829{
830 int ret = 0;
831 const char *name;
832 struct regulator_ops *ops = rdev->desc->ops;
833
af5866c9
MB		 834 rdev->constraints = constraints;
835
1083c393
MB		 836 name = rdev_get_name(rdev);
837
838 ret = machine_constraints_voltage(rdev, constraints);
e79055d6
MB		 839 if (ret != 0)
840 goto out;
841
a5766f11 842 /* do we need to setup our suspend state */
e06f5b4f 843 if (constraints->initial_state) {
a5766f11 844 ret = suspend_prepare(rdev, constraints->initial_state);
e06f5b4f
MB		 845 if (ret < 0) {
846 printk(KERN_ERR "%s: failed to set suspend state for %s\n",
847 __func__, name);
848 rdev->constraints = NULL;
849 goto out;
850 }
851 }
a5766f11 852
a308466c
MB		 853 if (constraints->initial_mode) {
854 if (!ops->set_mode) {
855 printk(KERN_ERR "%s: no set_mode operation for %s\n",
856 __func__, name);
857 ret = -EINVAL;
858 goto out;
859 }
860
861 ret = ops->set_mode(rdev, constraints->initial_mode);
862 if (ret < 0) {
863 printk(KERN_ERR
864 "%s: failed to set initial mode for %s: %d\n",
865 __func__, name, ret);
866 goto out;
867 }
868 }
869
cacf90f2
MB		 870 /* If the constraints say the regulator should be on at this point
871 * and we have control then make sure it is enabled.
872 */
873 if ((constraints->always_on || constraints->boot_on) && ops->enable) {
e5fda26c
MB		 874 ret = ops->enable(rdev);
875 if (ret < 0) {
876 printk(KERN_ERR "%s: failed to enable %s\n",
877 __func__, name);
878 rdev->constraints = NULL;
879 goto out;
880 }
881 }
882
a5766f11
LG		 883 print_constraints(rdev);
884out:
885 return ret;
886}
887
888/**
889 * set_supply - set regulator supply regulator
69279fb9
MB		 890 * @rdev: regulator name
891 * @supply_rdev: supply regulator name
a5766f11
LG		 892 *
893 * Called by platform initialisation code to set the supply regulator for this
894 * regulator. This ensures that a regulators supply will also be enabled by the
895 * core if it's child is enabled.
896 */
897static int set_supply(struct regulator_dev *rdev,
898 struct regulator_dev *supply_rdev)
899{
900 int err;
901
902 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
903 "supply");
904 if (err) {
905 printk(KERN_ERR
906 "%s: could not add device link %s err %d\n",
907 __func__, supply_rdev->dev.kobj.name, err);
908 goto out;
909 }
910 rdev->supply = supply_rdev;
911 list_add(&rdev->slist, &supply_rdev->supply_list);
912out:
913 return err;
914}
915
916/**
06c63f93 917 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9
MB		 918 * @rdev: regulator source
919 * @consumer_dev: device the supply applies to
40f9244f 920 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 921 * @supply: symbolic name for supply
a5766f11
LG		 922 *
923 * Allows platform initialisation code to map physical regulator
924 * sources to symbolic names for supplies for use by devices. Devices
925 * should use these symbolic names to request regulators, avoiding the
926 * need to provide board-specific regulator names as platform data.
40f9244f
MB		 927 *
928 * Only one of consumer_dev and consumer_dev_name may be specified.
a5766f11
LG		 929 */
930static int set_consumer_device_supply(struct regulator_dev *rdev,
40f9244f
MB		 931 struct device *consumer_dev, const char *consumer_dev_name,
932 const char *supply)
a5766f11
LG		 933{
934 struct regulator_map *node;
9ed2099e 935 int has_dev;
a5766f11 936
40f9244f
MB		 937 if (consumer_dev && consumer_dev_name)
938 return -EINVAL;
939
940 if (!consumer_dev_name && consumer_dev)
941 consumer_dev_name = dev_name(consumer_dev);
942
a5766f11
LG		 943 if (supply == NULL)
944 return -EINVAL;
945
9ed2099e
MB		 946 if (consumer_dev_name != NULL)
947 has_dev = 1;
948 else
949 has_dev = 0;
950
6001e13c 951 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 952 if (node->dev_name && consumer_dev_name) {
953 if (strcmp(node->dev_name, consumer_dev_name) != 0)
954 continue;
955 } else if (node->dev_name || consumer_dev_name) {
6001e13c 956 continue;
23b5cc2a
JN		 957 }
958
6001e13c
DB		 959 if (strcmp(node->supply, supply) != 0)
960 continue;
961
962 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
963 dev_name(&node->regulator->dev),
964 node->regulator->desc->name,
965 supply,
1083c393 966 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 967 return -EBUSY;
968 }
969
9ed2099e 970 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 971 if (node == NULL)
972 return -ENOMEM;
973
974 node->regulator = rdev;
a5766f11
LG		 975 node->supply = supply;
976
9ed2099e
MB		 977 if (has_dev) {
978 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
979 if (node->dev_name == NULL) {
980 kfree(node);
981 return -ENOMEM;
982 }
40f9244f
MB		 983 }
984
a5766f11
LG		 985 list_add(&node->list, &regulator_map_list);
986 return 0;
987}
988
0f1d747b
MR		 989static void unset_regulator_supplies(struct regulator_dev *rdev)
990{
991 struct regulator_map *node, *n;
992
993 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
994 if (rdev == node->regulator) {
995 list_del(&node->list);
40f9244f 996 kfree(node->dev_name);
0f1d747b 997 kfree(node);
0f1d747b
MR		 998 }
999 }
1000}
1001
414c70cb
LG		 1002#define REG_STR_SIZE 32
1003
1004static struct regulator *create_regulator(struct regulator_dev *rdev,
1005 struct device *dev,
1006 const char *supply_name)
1007{
1008 struct regulator *regulator;
1009 char buf[REG_STR_SIZE];
1010 int err, size;
1011
1012 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1013 if (regulator == NULL)
1014 return NULL;
1015
1016 mutex_lock(&rdev->mutex);
1017 regulator->rdev = rdev;
1018 list_add(&regulator->list, &rdev->consumer_list);
1019
1020 if (dev) {
1021 /* create a 'requested_microamps_name' sysfs entry */
1022 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
1023 supply_name);
1024 if (size >= REG_STR_SIZE)
1025 goto overflow_err;
1026
1027 regulator->dev = dev;
4f26a2ab 1028 sysfs_attr_init(&regulator->dev_attr.attr);
414c70cb
LG		 1029 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1030 if (regulator->dev_attr.attr.name == NULL)
1031 goto attr_name_err;
1032
414c70cb
LG		 1033 regulator->dev_attr.attr.mode = 0444;
1034 regulator->dev_attr.show = device_requested_uA_show;
1035 err = device_create_file(dev, &regulator->dev_attr);
1036 if (err < 0) {
1037 printk(KERN_WARNING "%s: could not add regulator_dev"
1038 " load sysfs\n", __func__);
1039 goto attr_name_err;
1040 }
1041
1042 /* also add a link to the device sysfs entry */
1043 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1044 dev->kobj.name, supply_name);
1045 if (size >= REG_STR_SIZE)
1046 goto attr_err;
1047
1048 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1049 if (regulator->supply_name == NULL)
1050 goto attr_err;
1051
1052 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1053 buf);
1054 if (err) {
1055 printk(KERN_WARNING
1056 "%s: could not add device link %s err %d\n",
1057 __func__, dev->kobj.name, err);
414c70cb
LG		 1058 goto link_name_err;
1059 }
1060 }
1061 mutex_unlock(&rdev->mutex);
1062 return regulator;
1063link_name_err:
1064 kfree(regulator->supply_name);
1065attr_err:
1066 device_remove_file(regulator->dev, &regulator->dev_attr);
1067attr_name_err:
1068 kfree(regulator->dev_attr.attr.name);
1069overflow_err:
1070 list_del(&regulator->list);
1071 kfree(regulator);
1072 mutex_unlock(&rdev->mutex);
1073 return NULL;
1074}
1075
31aae2be
MB		 1076static int _regulator_get_enable_time(struct regulator_dev *rdev)
1077{
1078 if (!rdev->desc->ops->enable_time)
1079 return 0;
1080 return rdev->desc->ops->enable_time(rdev);
1081}
1082
5ffbd136
MB		 1083/* Internal regulator request function */
1084static struct regulator *_regulator_get(struct device *dev, const char *id,
1085 int exclusive)
414c70cb
LG		 1086{
1087 struct regulator_dev *rdev;
1088 struct regulator_map *map;
1089 struct regulator *regulator = ERR_PTR(-ENODEV);
40f9244f 1090 const char *devname = NULL;
5ffbd136 1091 int ret;
414c70cb
LG		 1092
1093 if (id == NULL) {
1094 printk(KERN_ERR "regulator: get() with no identifier\n");
1095 return regulator;
1096 }
1097
40f9244f
MB		 1098 if (dev)
1099 devname = dev_name(dev);
1100
414c70cb
LG		 1101 mutex_lock(&regulator_list_mutex);
1102
1103 list_for_each_entry(map, &regulator_map_list, list) {
40f9244f
MB		 1104 /* If the mapping has a device set up it must match */
1105 if (map->dev_name &&
1106 (!devname || strcmp(map->dev_name, devname)))
1107 continue;
1108
1109 if (strcmp(map->supply, id) == 0) {
a5766f11 1110 rdev = map->regulator;
414c70cb 1111 goto found;
a5766f11 1112 }
414c70cb 1113 }
34abbd68 1114
688fe99a
MB		 1115 if (board_wants_dummy_regulator) {
1116 rdev = dummy_regulator_rdev;
1117 goto found;
1118 }
1119
34abbd68
MB		 1120#ifdef CONFIG_REGULATOR_DUMMY
1121 if (!devname)
1122 devname = "deviceless";
1123
1124 /* If the board didn't flag that it was fully constrained then
1125 * substitute in a dummy regulator so consumers can continue.
1126 */
1127 if (!has_full_constraints) {
1128 pr_warning("%s supply %s not found, using dummy regulator\n",
1129 devname, id);
1130 rdev = dummy_regulator_rdev;
1131 goto found;
1132 }
1133#endif
1134
414c70cb
LG		 1135 mutex_unlock(&regulator_list_mutex);
1136 return regulator;
1137
1138found:
5ffbd136
MB		 1139 if (rdev->exclusive) {
1140 regulator = ERR_PTR(-EPERM);
1141 goto out;
1142 }
1143
1144 if (exclusive && rdev->open_count) {
1145 regulator = ERR_PTR(-EBUSY);
1146 goto out;
1147 }
1148
a5766f11
LG		 1149 if (!try_module_get(rdev->owner))
1150 goto out;
1151
414c70cb
LG		 1152 regulator = create_regulator(rdev, dev, id);
1153 if (regulator == NULL) {
1154 regulator = ERR_PTR(-ENOMEM);
1155 module_put(rdev->owner);
1156 }
1157
5ffbd136
MB		 1158 rdev->open_count++;
1159 if (exclusive) {
1160 rdev->exclusive = 1;
1161
1162 ret = _regulator_is_enabled(rdev);
1163 if (ret > 0)
1164 rdev->use_count = 1;
1165 else
1166 rdev->use_count = 0;
1167 }
1168
a5766f11 1169out:
414c70cb 1170 mutex_unlock(&regulator_list_mutex);
5ffbd136 1171
414c70cb
LG		 1172 return regulator;
1173}
5ffbd136
MB		 1174
1175/**
1176 * regulator_get - lookup and obtain a reference to a regulator.
1177 * @dev: device for regulator "consumer"
1178 * @id: Supply name or regulator ID.
1179 *
1180 * Returns a struct regulator corresponding to the regulator producer,
1181 * or IS_ERR() condition containing errno.
1182 *
1183 * Use of supply names configured via regulator_set_device_supply() is
1184 * strongly encouraged. It is recommended that the supply name used
1185 * should match the name used for the supply and/or the relevant
1186 * device pins in the datasheet.
1187 */
1188struct regulator *regulator_get(struct device *dev, const char *id)
1189{
1190 return _regulator_get(dev, id, 0);
1191}
414c70cb
LG		 1192EXPORT_SYMBOL_GPL(regulator_get);
1193
5ffbd136
MB		 1194/**
1195 * regulator_get_exclusive - obtain exclusive access to a regulator.
1196 * @dev: device for regulator "consumer"
1197 * @id: Supply name or regulator ID.
1198 *
1199 * Returns a struct regulator corresponding to the regulator producer,
1200 * or IS_ERR() condition containing errno. Other consumers will be
1201 * unable to obtain this reference is held and the use count for the
1202 * regulator will be initialised to reflect the current state of the
1203 * regulator.
1204 *
1205 * This is intended for use by consumers which cannot tolerate shared
1206 * use of the regulator such as those which need to force the
1207 * regulator off for correct operation of the hardware they are
1208 * controlling.
1209 *
1210 * Use of supply names configured via regulator_set_device_supply() is
1211 * strongly encouraged. It is recommended that the supply name used
1212 * should match the name used for the supply and/or the relevant
1213 * device pins in the datasheet.
1214 */
1215struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1216{
1217 return _regulator_get(dev, id, 1);
1218}
1219EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1220
414c70cb
LG		 1221/**
1222 * regulator_put - "free" the regulator source
1223 * @regulator: regulator source
1224 *
1225 * Note: drivers must ensure that all regulator_enable calls made on this
1226 * regulator source are balanced by regulator_disable calls prior to calling
1227 * this function.
1228 */
1229void regulator_put(struct regulator *regulator)
1230{
1231 struct regulator_dev *rdev;
1232
1233 if (regulator == NULL || IS_ERR(regulator))
1234 return;
1235
414c70cb
LG		 1236 mutex_lock(&regulator_list_mutex);
1237 rdev = regulator->rdev;
1238
1239 /* remove any sysfs entries */
1240 if (regulator->dev) {
1241 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1242 kfree(regulator->supply_name);
1243 device_remove_file(regulator->dev, &regulator->dev_attr);
1244 kfree(regulator->dev_attr.attr.name);
1245 }
1246 list_del(&regulator->list);
1247 kfree(regulator);
1248
5ffbd136
MB		 1249 rdev->open_count--;
1250 rdev->exclusive = 0;
1251
414c70cb
LG		 1252 module_put(rdev->owner);
1253 mutex_unlock(&regulator_list_mutex);
1254}
1255EXPORT_SYMBOL_GPL(regulator_put);
1256
9a2372fa
MB		 1257static int _regulator_can_change_status(struct regulator_dev *rdev)
1258{
1259 if (!rdev->constraints)
1260 return 0;
1261
1262 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
1263 return 1;
1264 else
1265 return 0;
1266}
1267
414c70cb
LG		 1268/* locks held by regulator_enable() */
1269static int _regulator_enable(struct regulator_dev *rdev)
1270{
31aae2be 1271 int ret, delay;
414c70cb 1272
63cee946
MW		 1273 /* do we need to enable the supply regulator first */
1274 if (rdev->supply) {
1275 mutex_lock(&rdev->supply->mutex);
1276 ret = _regulator_enable(rdev->supply);
1277 mutex_unlock(&rdev->supply->mutex);
1278 if (ret < 0) {
1279 printk(KERN_ERR "%s: failed to enable %s: %d\n",
1280 __func__, rdev_get_name(rdev), ret);
1281 return ret;
414c70cb
LG		 1282 }
1283 }
1284
1285 /* check voltage and requested load before enabling */
9a2372fa
MB		 1286 if (rdev->constraints &&
1287 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1288 drms_uA_update(rdev);
414c70cb 1289
9a2372fa
MB		 1290 if (rdev->use_count == 0) {
1291 /* The regulator may on if it's not switchable or left on */
1292 ret = _regulator_is_enabled(rdev);
1293 if (ret == -EINVAL || ret == 0) {
1294 if (!_regulator_can_change_status(rdev))
1295 return -EPERM;
1296
31aae2be 1297 if (!rdev->desc->ops->enable)
9a2372fa 1298 return -EINVAL;
31aae2be
MB		 1299
1300 /* Query before enabling in case configuration
1301 * dependant. */
1302 ret = _regulator_get_enable_time(rdev);
1303 if (ret >= 0) {
1304 delay = ret;
1305 } else {
1306 printk(KERN_WARNING
1307 "%s: enable_time() failed for %s: %d\n",
1308 __func__, rdev_get_name(rdev),
1309 ret);
1310 delay = 0;
9a2372fa 1311 }
31aae2be
MB		 1312
1313 /* Allow the regulator to ramp; it would be useful
1314 * to extend this for bulk operations so that the
1315 * regulators can ramp together. */
1316 ret = rdev->desc->ops->enable(rdev);
1317 if (ret < 0)
1318 return ret;
1319
e36c1df8 1320 if (delay >= 1000) {
31aae2be 1321 mdelay(delay / 1000);
e36c1df8
AL		 1322 udelay(delay % 1000);
1323 } else if (delay) {
31aae2be 1324 udelay(delay);
e36c1df8 1325 }
31aae2be 1326
a7433cff 1327 } else if (ret < 0) {
9a2372fa 1328 printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n",
1083c393 1329 __func__, rdev_get_name(rdev), ret);
414c70cb
LG		 1330 return ret;
1331 }
a7433cff 1332 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 1333 }
1334
9a2372fa
MB		 1335 rdev->use_count++;
1336
1337 return 0;
414c70cb
LG		 1338}
1339
1340/**
1341 * regulator_enable - enable regulator output
1342 * @regulator: regulator source
1343 *
cf7bbcdf
MB		 1344 * Request that the regulator be enabled with the regulator output at
1345 * the predefined voltage or current value. Calls to regulator_enable()
1346 * must be balanced with calls to regulator_disable().
1347 *
414c70cb 1348 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 1349 * hardwired in the regulator.
414c70cb
LG		 1350 */
1351int regulator_enable(struct regulator *regulator)
1352{
412aec61
DB		 1353 struct regulator_dev *rdev = regulator->rdev;
1354 int ret = 0;
414c70cb 1355
412aec61 1356 mutex_lock(&rdev->mutex);
cd94b505 1357 ret = _regulator_enable(rdev);
412aec61 1358 mutex_unlock(&rdev->mutex);
414c70cb
LG		 1359 return ret;
1360}
1361EXPORT_SYMBOL_GPL(regulator_enable);
1362
1363/* locks held by regulator_disable() */
8cbf811d
JC		 1364static int _regulator_disable(struct regulator_dev *rdev,
1365 struct regulator_dev **supply_rdev_ptr)
414c70cb
LG		 1366{
1367 int ret = 0;
b12a1e29 1368 *supply_rdev_ptr = NULL;
414c70cb 1369
cd94b505
DB		 1370 if (WARN(rdev->use_count <= 0,
1371 "unbalanced disables for %s\n",
1083c393 1372 rdev_get_name(rdev)))
cd94b505
DB		 1373 return -EIO;
1374
414c70cb 1375 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 1376 if (rdev->use_count == 1 &&
1377 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 1378
1379 /* we are last user */
9a2372fa
MB		 1380 if (_regulator_can_change_status(rdev) &&
1381 rdev->desc->ops->disable) {
414c70cb
LG		 1382 ret = rdev->desc->ops->disable(rdev);
1383 if (ret < 0) {
1384 printk(KERN_ERR "%s: failed to disable %s\n",
1083c393 1385 __func__, rdev_get_name(rdev));
414c70cb
LG		 1386 return ret;
1387 }
84b68263
MB		 1388
1389 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1390 NULL);
414c70cb
LG		 1391 }
1392
1393 /* decrease our supplies ref count and disable if required */
8cbf811d 1394 *supply_rdev_ptr = rdev->supply;
414c70cb
LG		 1395
1396 rdev->use_count = 0;
1397 } else if (rdev->use_count > 1) {
1398
1399 if (rdev->constraints &&
1400 (rdev->constraints->valid_ops_mask &
1401 REGULATOR_CHANGE_DRMS))
1402 drms_uA_update(rdev);
1403
1404 rdev->use_count--;
1405 }
1406 return ret;
1407}
1408
1409/**
1410 * regulator_disable - disable regulator output
1411 * @regulator: regulator source
1412 *
cf7bbcdf
MB		 1413 * Disable the regulator output voltage or current. Calls to
1414 * regulator_enable() must be balanced with calls to
1415 * regulator_disable().
69279fb9 1416 *
414c70cb 1417 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 1418 * devices have it enabled, the regulator device supports disabling and
1419 * machine constraints permit this operation.
414c70cb
LG		 1420 */
1421int regulator_disable(struct regulator *regulator)
1422{
412aec61 1423 struct regulator_dev *rdev = regulator->rdev;
8cbf811d 1424 struct regulator_dev *supply_rdev = NULL;
412aec61 1425 int ret = 0;
414c70cb 1426
412aec61 1427 mutex_lock(&rdev->mutex);
8cbf811d 1428 ret = _regulator_disable(rdev, &supply_rdev);
412aec61 1429 mutex_unlock(&rdev->mutex);
8cbf811d
JC		 1430
1431 /* decrease our supplies ref count and disable if required */
1432 while (supply_rdev != NULL) {
1433 rdev = supply_rdev;
1434
1435 mutex_lock(&rdev->mutex);
1436 _regulator_disable(rdev, &supply_rdev);
1437 mutex_unlock(&rdev->mutex);
1438 }
1439
414c70cb
LG		 1440 return ret;
1441}
1442EXPORT_SYMBOL_GPL(regulator_disable);
1443
1444/* locks held by regulator_force_disable() */
8cbf811d
JC		 1445static int _regulator_force_disable(struct regulator_dev *rdev,
1446 struct regulator_dev **supply_rdev_ptr)
414c70cb
LG		 1447{
1448 int ret = 0;
1449
1450 /* force disable */
1451 if (rdev->desc->ops->disable) {
1452 /* ah well, who wants to live forever... */
1453 ret = rdev->desc->ops->disable(rdev);
1454 if (ret < 0) {
1455 printk(KERN_ERR "%s: failed to force disable %s\n",
1083c393 1456 __func__, rdev_get_name(rdev));
414c70cb
LG		 1457 return ret;
1458 }
1459 /* notify other consumers that power has been forced off */
84b68263
MB		 1460 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1461 REGULATOR_EVENT_DISABLE, NULL);
414c70cb
LG		 1462 }
1463
1464 /* decrease our supplies ref count and disable if required */
8cbf811d 1465 *supply_rdev_ptr = rdev->supply;
414c70cb
LG		 1466
1467 rdev->use_count = 0;
1468 return ret;
1469}
1470
1471/**
1472 * regulator_force_disable - force disable regulator output
1473 * @regulator: regulator source
1474 *
1475 * Forcibly disable the regulator output voltage or current.
1476 * NOTE: this *will* disable the regulator output even if other consumer
1477 * devices have it enabled. This should be used for situations when device
1478 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1479 */
1480int regulator_force_disable(struct regulator *regulator)
1481{
8cbf811d 1482 struct regulator_dev *supply_rdev = NULL;
414c70cb
LG		 1483 int ret;
1484
1485 mutex_lock(&regulator->rdev->mutex);
414c70cb 1486 regulator->uA_load = 0;
8cbf811d 1487 ret = _regulator_force_disable(regulator->rdev, &supply_rdev);
414c70cb 1488 mutex_unlock(&regulator->rdev->mutex);
8cbf811d
JC		 1489
1490 if (supply_rdev)
1491 regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev)));
1492
414c70cb
LG		 1493 return ret;
1494}
1495EXPORT_SYMBOL_GPL(regulator_force_disable);
1496
1497static int _regulator_is_enabled(struct regulator_dev *rdev)
1498{
9a7f6a4c 1499 /* If we don't know then assume that the regulator is always on */
9332546f 1500 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 1501 return 1;
414c70cb 1502
9332546f 1503 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 1504}
1505
1506/**
1507 * regulator_is_enabled - is the regulator output enabled
1508 * @regulator: regulator source
1509 *
412aec61
DB		 1510 * Returns positive if the regulator driver backing the source/client
1511 * has requested that the device be enabled, zero if it hasn't, else a
1512 * negative errno code.
1513 *
1514 * Note that the device backing this regulator handle can have multiple
1515 * users, so it might be enabled even if regulator_enable() was never
1516 * called for this particular source.
414c70cb
LG		 1517 */
1518int regulator_is_enabled(struct regulator *regulator)
1519{
9332546f
MB		 1520 int ret;
1521
1522 mutex_lock(&regulator->rdev->mutex);
1523 ret = _regulator_is_enabled(regulator->rdev);
1524 mutex_unlock(&regulator->rdev->mutex);
1525
1526 return ret;
414c70cb
LG		 1527}
1528EXPORT_SYMBOL_GPL(regulator_is_enabled);
1529
4367cfdc
DB		 1530/**
1531 * regulator_count_voltages - count regulator_list_voltage() selectors
1532 * @regulator: regulator source
1533 *
1534 * Returns number of selectors, or negative errno. Selectors are
1535 * numbered starting at zero, and typically correspond to bitfields
1536 * in hardware registers.
1537 */
1538int regulator_count_voltages(struct regulator *regulator)
1539{
1540 struct regulator_dev *rdev = regulator->rdev;
1541
1542 return rdev->desc->n_voltages ? : -EINVAL;
1543}
1544EXPORT_SYMBOL_GPL(regulator_count_voltages);
1545
1546/**
1547 * regulator_list_voltage - enumerate supported voltages
1548 * @regulator: regulator source
1549 * @selector: identify voltage to list
1550 * Context: can sleep
1551 *
1552 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 1553 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 1554 * negative errno.
1555 */
1556int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1557{
1558 struct regulator_dev *rdev = regulator->rdev;
1559 struct regulator_ops *ops = rdev->desc->ops;
1560 int ret;
1561
1562 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1563 return -EINVAL;
1564
1565 mutex_lock(&rdev->mutex);
1566 ret = ops->list_voltage(rdev, selector);
1567 mutex_unlock(&rdev->mutex);
1568
1569 if (ret > 0) {
1570 if (ret < rdev->constraints->min_uV)
1571 ret = 0;
1572 else if (ret > rdev->constraints->max_uV)
1573 ret = 0;
1574 }
1575
1576 return ret;
1577}
1578EXPORT_SYMBOL_GPL(regulator_list_voltage);
1579
a7a1ad90
MB		 1580/**
1581 * regulator_is_supported_voltage - check if a voltage range can be supported
1582 *
1583 * @regulator: Regulator to check.
1584 * @min_uV: Minimum required voltage in uV.
1585 * @max_uV: Maximum required voltage in uV.
1586 *
1587 * Returns a boolean or a negative error code.
1588 */
1589int regulator_is_supported_voltage(struct regulator *regulator,
1590 int min_uV, int max_uV)
1591{
1592 int i, voltages, ret;
1593
1594 ret = regulator_count_voltages(regulator);
1595 if (ret < 0)
1596 return ret;
1597 voltages = ret;
1598
1599 for (i = 0; i < voltages; i++) {
1600 ret = regulator_list_voltage(regulator, i);
1601
1602 if (ret >= min_uV && ret <= max_uV)
1603 return 1;
1604 }
1605
1606 return 0;
1607}
1608
414c70cb
LG		 1609/**
1610 * regulator_set_voltage - set regulator output voltage
1611 * @regulator: regulator source
1612 * @min_uV: Minimum required voltage in uV
1613 * @max_uV: Maximum acceptable voltage in uV
1614 *
1615 * Sets a voltage regulator to the desired output voltage. This can be set
1616 * during any regulator state. IOW, regulator can be disabled or enabled.
1617 *
1618 * If the regulator is enabled then the voltage will change to the new value
1619 * immediately otherwise if the regulator is disabled the regulator will
1620 * output at the new voltage when enabled.
1621 *
1622 * NOTE: If the regulator is shared between several devices then the lowest
1623 * request voltage that meets the system constraints will be used.
69279fb9 1624 * Regulator system constraints must be set for this regulator before
414c70cb
LG		 1625 * calling this function otherwise this call will fail.
1626 */
1627int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1628{
1629 struct regulator_dev *rdev = regulator->rdev;
1630 int ret;
3a93f2a9 1631 unsigned selector;
414c70cb
LG		 1632
1633 mutex_lock(&rdev->mutex);
1634
1635 /* sanity check */
1636 if (!rdev->desc->ops->set_voltage) {
1637 ret = -EINVAL;
1638 goto out;
1639 }
1640
1641 /* constraints check */
1642 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1643 if (ret < 0)
1644 goto out;
1645 regulator->min_uV = min_uV;
1646 regulator->max_uV = max_uV;
3a93f2a9
MB		 1647
1648 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, &selector);
1649
1650 if (rdev->desc->ops->list_voltage)
1651 selector = rdev->desc->ops->list_voltage(rdev, selector);
1652 else
1653 selector = -1;
414c70cb
LG		 1654
1655out:
b136fb44 1656 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL);
414c70cb
LG		 1657 mutex_unlock(&rdev->mutex);
1658 return ret;
1659}
1660EXPORT_SYMBOL_GPL(regulator_set_voltage);
1661
1662static int _regulator_get_voltage(struct regulator_dev *rdev)
1663{
1664 /* sanity check */
1665 if (rdev->desc->ops->get_voltage)
1666 return rdev->desc->ops->get_voltage(rdev);
1667 else
1668 return -EINVAL;
1669}
1670
1671/**
1672 * regulator_get_voltage - get regulator output voltage
1673 * @regulator: regulator source
1674 *
1675 * This returns the current regulator voltage in uV.
1676 *
1677 * NOTE: If the regulator is disabled it will return the voltage value. This
1678 * function should not be used to determine regulator state.
1679 */
1680int regulator_get_voltage(struct regulator *regulator)
1681{
1682 int ret;
1683
1684 mutex_lock(&regulator->rdev->mutex);
1685
1686 ret = _regulator_get_voltage(regulator->rdev);
1687
1688 mutex_unlock(&regulator->rdev->mutex);
1689
1690 return ret;
1691}
1692EXPORT_SYMBOL_GPL(regulator_get_voltage);
1693
1694/**
1695 * regulator_set_current_limit - set regulator output current limit
1696 * @regulator: regulator source
1697 * @min_uA: Minimuum supported current in uA
1698 * @max_uA: Maximum supported current in uA
1699 *
1700 * Sets current sink to the desired output current. This can be set during
1701 * any regulator state. IOW, regulator can be disabled or enabled.
1702 *
1703 * If the regulator is enabled then the current will change to the new value
1704 * immediately otherwise if the regulator is disabled the regulator will
1705 * output at the new current when enabled.
1706 *
1707 * NOTE: Regulator system constraints must be set for this regulator before
1708 * calling this function otherwise this call will fail.
1709 */
1710int regulator_set_current_limit(struct regulator *regulator,
1711 int min_uA, int max_uA)
1712{
1713 struct regulator_dev *rdev = regulator->rdev;
1714 int ret;
1715
1716 mutex_lock(&rdev->mutex);
1717
1718 /* sanity check */
1719 if (!rdev->desc->ops->set_current_limit) {
1720 ret = -EINVAL;
1721 goto out;
1722 }
1723
1724 /* constraints check */
1725 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1726 if (ret < 0)
1727 goto out;
1728
1729 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1730out:
1731 mutex_unlock(&rdev->mutex);
1732 return ret;
1733}
1734EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1735
1736static int _regulator_get_current_limit(struct regulator_dev *rdev)
1737{
1738 int ret;
1739
1740 mutex_lock(&rdev->mutex);
1741
1742 /* sanity check */
1743 if (!rdev->desc->ops->get_current_limit) {
1744 ret = -EINVAL;
1745 goto out;
1746 }
1747
1748 ret = rdev->desc->ops->get_current_limit(rdev);
1749out:
1750 mutex_unlock(&rdev->mutex);
1751 return ret;
1752}
1753
1754/**
1755 * regulator_get_current_limit - get regulator output current
1756 * @regulator: regulator source
1757 *
1758 * This returns the current supplied by the specified current sink in uA.
1759 *
1760 * NOTE: If the regulator is disabled it will return the current value. This
1761 * function should not be used to determine regulator state.
1762 */
1763int regulator_get_current_limit(struct regulator *regulator)
1764{
1765 return _regulator_get_current_limit(regulator->rdev);
1766}
1767EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1768
1769/**
1770 * regulator_set_mode - set regulator operating mode
1771 * @regulator: regulator source
1772 * @mode: operating mode - one of the REGULATOR_MODE constants
1773 *
1774 * Set regulator operating mode to increase regulator efficiency or improve
1775 * regulation performance.
1776 *
1777 * NOTE: Regulator system constraints must be set for this regulator before
1778 * calling this function otherwise this call will fail.
1779 */
1780int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1781{
1782 struct regulator_dev *rdev = regulator->rdev;
1783 int ret;
500b4ac9 1784 int regulator_curr_mode;
414c70cb
LG		 1785
1786 mutex_lock(&rdev->mutex);
1787
1788 /* sanity check */
1789 if (!rdev->desc->ops->set_mode) {
1790 ret = -EINVAL;
1791 goto out;
1792 }
1793
500b4ac9
SI		 1794 /* return if the same mode is requested */
1795 if (rdev->desc->ops->get_mode) {
1796 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
1797 if (regulator_curr_mode == mode) {
1798 ret = 0;
1799 goto out;
1800 }
1801 }
1802
414c70cb
LG		 1803 /* constraints check */
1804 ret = regulator_check_mode(rdev, mode);
1805 if (ret < 0)
1806 goto out;
1807
1808 ret = rdev->desc->ops->set_mode(rdev, mode);
1809out:
1810 mutex_unlock(&rdev->mutex);
1811 return ret;
1812}
1813EXPORT_SYMBOL_GPL(regulator_set_mode);
1814
1815static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
1816{
1817 int ret;
1818
1819 mutex_lock(&rdev->mutex);
1820
1821 /* sanity check */
1822 if (!rdev->desc->ops->get_mode) {
1823 ret = -EINVAL;
1824 goto out;
1825 }
1826
1827 ret = rdev->desc->ops->get_mode(rdev);
1828out:
1829 mutex_unlock(&rdev->mutex);
1830 return ret;
1831}
1832
1833/**
1834 * regulator_get_mode - get regulator operating mode
1835 * @regulator: regulator source
1836 *
1837 * Get the current regulator operating mode.
1838 */
1839unsigned int regulator_get_mode(struct regulator *regulator)
1840{
1841 return _regulator_get_mode(regulator->rdev);
1842}
1843EXPORT_SYMBOL_GPL(regulator_get_mode);
1844
1845/**
1846 * regulator_set_optimum_mode - set regulator optimum operating mode
1847 * @regulator: regulator source
1848 * @uA_load: load current
1849 *
1850 * Notifies the regulator core of a new device load. This is then used by
1851 * DRMS (if enabled by constraints) to set the most efficient regulator
1852 * operating mode for the new regulator loading.
1853 *
1854 * Consumer devices notify their supply regulator of the maximum power
1855 * they will require (can be taken from device datasheet in the power
1856 * consumption tables) when they change operational status and hence power
1857 * state. Examples of operational state changes that can affect power
1858 * consumption are :-
1859 *
1860 * o Device is opened / closed.
1861 * o Device I/O is about to begin or has just finished.
1862 * o Device is idling in between work.
1863 *
1864 * This information is also exported via sysfs to userspace.
1865 *
1866 * DRMS will sum the total requested load on the regulator and change
1867 * to the most efficient operating mode if platform constraints allow.
1868 *
1869 * Returns the new regulator mode or error.
1870 */
1871int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
1872{
1873 struct regulator_dev *rdev = regulator->rdev;
1874 struct regulator *consumer;
1875 int ret, output_uV, input_uV, total_uA_load = 0;
1876 unsigned int mode;
1877
1878 mutex_lock(&rdev->mutex);
1879
1880 regulator->uA_load = uA_load;
1881 ret = regulator_check_drms(rdev);
1882 if (ret < 0)
1883 goto out;
1884 ret = -EINVAL;
1885
1886 /* sanity check */
1887 if (!rdev->desc->ops->get_optimum_mode)
1888 goto out;
1889
1890 /* get output voltage */
1891 output_uV = rdev->desc->ops->get_voltage(rdev);
1892 if (output_uV <= 0) {
1893 printk(KERN_ERR "%s: invalid output voltage found for %s\n",
1083c393 1894 __func__, rdev_get_name(rdev));
414c70cb
LG		 1895 goto out;
1896 }
1897
1898 /* get input voltage */
1899 if (rdev->supply && rdev->supply->desc->ops->get_voltage)
1900 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
1901 else
1902 input_uV = rdev->constraints->input_uV;
1903 if (input_uV <= 0) {
1904 printk(KERN_ERR "%s: invalid input voltage found for %s\n",
1083c393 1905 __func__, rdev_get_name(rdev));
414c70cb
LG		 1906 goto out;
1907 }
1908
1909 /* calc total requested load for this regulator */
1910 list_for_each_entry(consumer, &rdev->consumer_list, list)
fa2984d4 1911 total_uA_load += consumer->uA_load;
414c70cb
LG		 1912
1913 mode = rdev->desc->ops->get_optimum_mode(rdev,
1914 input_uV, output_uV,
1915 total_uA_load);
e573520b
DB		 1916 ret = regulator_check_mode(rdev, mode);
1917 if (ret < 0) {
414c70cb 1918 printk(KERN_ERR "%s: failed to get optimum mode for %s @"
1083c393 1919 " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev),
414c70cb
LG		 1920 total_uA_load, input_uV, output_uV);
1921 goto out;
1922 }
1923
1924 ret = rdev->desc->ops->set_mode(rdev, mode);
e573520b 1925 if (ret < 0) {
414c70cb 1926 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n",
1083c393 1927 __func__, mode, rdev_get_name(rdev));
414c70cb
LG		 1928 goto out;
1929 }
1930 ret = mode;
1931out:
1932 mutex_unlock(&rdev->mutex);
1933 return ret;
1934}
1935EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
1936
1937/**
1938 * regulator_register_notifier - register regulator event notifier
1939 * @regulator: regulator source
69279fb9 1940 * @nb: notifier block
414c70cb
LG		 1941 *
1942 * Register notifier block to receive regulator events.
1943 */
1944int regulator_register_notifier(struct regulator *regulator,
1945 struct notifier_block *nb)
1946{
1947 return blocking_notifier_chain_register(&regulator->rdev->notifier,
1948 nb);
1949}
1950EXPORT_SYMBOL_GPL(regulator_register_notifier);
1951
1952/**
1953 * regulator_unregister_notifier - unregister regulator event notifier
1954 * @regulator: regulator source
69279fb9 1955 * @nb: notifier block
414c70cb
LG		 1956 *
1957 * Unregister regulator event notifier block.
1958 */
1959int regulator_unregister_notifier(struct regulator *regulator,
1960 struct notifier_block *nb)
1961{
1962 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
1963 nb);
1964}
1965EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
1966
b136fb44
JC		 1967/* notify regulator consumers and downstream regulator consumers.
1968 * Note mutex must be held by caller.
1969 */
414c70cb
LG		 1970static void _notifier_call_chain(struct regulator_dev *rdev,
1971 unsigned long event, void *data)
1972{
1973 struct regulator_dev *_rdev;
1974
1975 /* call rdev chain first */
414c70cb 1976 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
414c70cb
LG		 1977
1978 /* now notify regulator we supply */
b136fb44 1979 list_for_each_entry(_rdev, &rdev->supply_list, slist) {
fa2984d4
SR		 1980 mutex_lock(&_rdev->mutex);
1981 _notifier_call_chain(_rdev, event, data);
1982 mutex_unlock(&_rdev->mutex);
b136fb44 1983 }
414c70cb
LG		 1984}
1985
1986/**
1987 * regulator_bulk_get - get multiple regulator consumers
1988 *
1989 * @dev: Device to supply
1990 * @num_consumers: Number of consumers to register
1991 * @consumers: Configuration of consumers; clients are stored here.
1992 *
1993 * @return 0 on success, an errno on failure.
1994 *
1995 * This helper function allows drivers to get several regulator
1996 * consumers in one operation. If any of the regulators cannot be
1997 * acquired then any regulators that were allocated will be freed
1998 * before returning to the caller.
1999 */
2000int regulator_bulk_get(struct device *dev, int num_consumers,
2001 struct regulator_bulk_data *consumers)
2002{
2003 int i;
2004 int ret;
2005
2006 for (i = 0; i < num_consumers; i++)
2007 consumers[i].consumer = NULL;
2008
2009 for (i = 0; i < num_consumers; i++) {
2010 consumers[i].consumer = regulator_get(dev,
2011 consumers[i].supply);
2012 if (IS_ERR(consumers[i].consumer)) {
414c70cb 2013 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 2014 dev_err(dev, "Failed to get supply '%s': %d\n",
2015 consumers[i].supply, ret);
414c70cb
LG		 2016 consumers[i].consumer = NULL;
2017 goto err;
2018 }
2019 }
2020
2021 return 0;
2022
2023err:
2024 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2025 regulator_put(consumers[i].consumer);
2026
2027 return ret;
2028}
2029EXPORT_SYMBOL_GPL(regulator_bulk_get);
2030
2031/**
2032 * regulator_bulk_enable - enable multiple regulator consumers
2033 *
2034 * @num_consumers: Number of consumers
2035 * @consumers: Consumer data; clients are stored here.
2036 * @return 0 on success, an errno on failure
2037 *
2038 * This convenience API allows consumers to enable multiple regulator
2039 * clients in a single API call. If any consumers cannot be enabled
2040 * then any others that were enabled will be disabled again prior to
2041 * return.
2042 */
2043int regulator_bulk_enable(int num_consumers,
2044 struct regulator_bulk_data *consumers)
2045{
2046 int i;
2047 int ret;
2048
2049 for (i = 0; i < num_consumers; i++) {
2050 ret = regulator_enable(consumers[i].consumer);
2051 if (ret != 0)
2052 goto err;
2053 }
2054
2055 return 0;
2056
2057err:
5b307627 2058 printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret);
eb143ac1 2059 for (--i; i >= 0; --i)
414c70cb
LG		 2060 regulator_disable(consumers[i].consumer);
2061
2062 return ret;
2063}
2064EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2065
2066/**
2067 * regulator_bulk_disable - disable multiple regulator consumers
2068 *
2069 * @num_consumers: Number of consumers
2070 * @consumers: Consumer data; clients are stored here.
2071 * @return 0 on success, an errno on failure
2072 *
2073 * This convenience API allows consumers to disable multiple regulator
2074 * clients in a single API call. If any consumers cannot be enabled
2075 * then any others that were disabled will be disabled again prior to
2076 * return.
2077 */
2078int regulator_bulk_disable(int num_consumers,
2079 struct regulator_bulk_data *consumers)
2080{
2081 int i;
2082 int ret;
2083
2084 for (i = 0; i < num_consumers; i++) {
2085 ret = regulator_disable(consumers[i].consumer);
2086 if (ret != 0)
2087 goto err;
2088 }
2089
2090 return 0;
2091
2092err:
5b307627
MB		 2093 printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply,
2094 ret);
eb143ac1 2095 for (--i; i >= 0; --i)
414c70cb
LG		 2096 regulator_enable(consumers[i].consumer);
2097
2098 return ret;
2099}
2100EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2101
2102/**
2103 * regulator_bulk_free - free multiple regulator consumers
2104 *
2105 * @num_consumers: Number of consumers
2106 * @consumers: Consumer data; clients are stored here.
2107 *
2108 * This convenience API allows consumers to free multiple regulator
2109 * clients in a single API call.
2110 */
2111void regulator_bulk_free(int num_consumers,
2112 struct regulator_bulk_data *consumers)
2113{
2114 int i;
2115
2116 for (i = 0; i < num_consumers; i++) {
2117 regulator_put(consumers[i].consumer);
2118 consumers[i].consumer = NULL;
2119 }
2120}
2121EXPORT_SYMBOL_GPL(regulator_bulk_free);
2122
2123/**
2124 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 2125 * @rdev: regulator source
414c70cb 2126 * @event: notifier block
69279fb9 2127 * @data: callback-specific data.
414c70cb
LG		 2128 *
2129 * Called by regulator drivers to notify clients a regulator event has
2130 * occurred. We also notify regulator clients downstream.
b136fb44 2131 * Note lock must be held by caller.
414c70cb
LG		 2132 */
2133int regulator_notifier_call_chain(struct regulator_dev *rdev,
2134 unsigned long event, void *data)
2135{
2136 _notifier_call_chain(rdev, event, data);
2137 return NOTIFY_DONE;
2138
2139}
2140EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2141
be721979
MB		 2142/**
2143 * regulator_mode_to_status - convert a regulator mode into a status
2144 *
2145 * @mode: Mode to convert
2146 *
2147 * Convert a regulator mode into a status.
2148 */
2149int regulator_mode_to_status(unsigned int mode)
2150{
2151 switch (mode) {
2152 case REGULATOR_MODE_FAST:
2153 return REGULATOR_STATUS_FAST;
2154 case REGULATOR_MODE_NORMAL:
2155 return REGULATOR_STATUS_NORMAL;
2156 case REGULATOR_MODE_IDLE:
2157 return REGULATOR_STATUS_IDLE;
2158 case REGULATOR_STATUS_STANDBY:
2159 return REGULATOR_STATUS_STANDBY;
2160 default:
2161 return 0;
2162 }
2163}
2164EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2165
7ad68e2f
DB		 2166/*
2167 * To avoid cluttering sysfs (and memory) with useless state, only
2168 * create attributes that can be meaningfully displayed.
2169 */
2170static int add_regulator_attributes(struct regulator_dev *rdev)
2171{
2172 struct device *dev = &rdev->dev;
2173 struct regulator_ops *ops = rdev->desc->ops;
2174 int status = 0;
2175
2176 /* some attributes need specific methods to be displayed */
2177 if (ops->get_voltage) {
2178 status = device_create_file(dev, &dev_attr_microvolts);
2179 if (status < 0)
2180 return status;
2181 }
2182 if (ops->get_current_limit) {
2183 status = device_create_file(dev, &dev_attr_microamps);
2184 if (status < 0)
2185 return status;
2186 }
2187 if (ops->get_mode) {
2188 status = device_create_file(dev, &dev_attr_opmode);
2189 if (status < 0)
2190 return status;
2191 }
2192 if (ops->is_enabled) {
2193 status = device_create_file(dev, &dev_attr_state);
2194 if (status < 0)
2195 return status;
2196 }
853116a1
DB		 2197 if (ops->get_status) {
2198 status = device_create_file(dev, &dev_attr_status);
2199 if (status < 0)
2200 return status;
2201 }
7ad68e2f
DB		 2202
2203 /* some attributes are type-specific */
2204 if (rdev->desc->type == REGULATOR_CURRENT) {
2205 status = device_create_file(dev, &dev_attr_requested_microamps);
2206 if (status < 0)
2207 return status;
2208 }
2209
2210 /* all the other attributes exist to support constraints;
2211 * don't show them if there are no constraints, or if the
2212 * relevant supporting methods are missing.
2213 */
2214 if (!rdev->constraints)
2215 return status;
2216
2217 /* constraints need specific supporting methods */
2218 if (ops->set_voltage) {
2219 status = device_create_file(dev, &dev_attr_min_microvolts);
2220 if (status < 0)
2221 return status;
2222 status = device_create_file(dev, &dev_attr_max_microvolts);
2223 if (status < 0)
2224 return status;
2225 }
2226 if (ops->set_current_limit) {
2227 status = device_create_file(dev, &dev_attr_min_microamps);
2228 if (status < 0)
2229 return status;
2230 status = device_create_file(dev, &dev_attr_max_microamps);
2231 if (status < 0)
2232 return status;
2233 }
2234
2235 /* suspend mode constraints need multiple supporting methods */
2236 if (!(ops->set_suspend_enable && ops->set_suspend_disable))
2237 return status;
2238
2239 status = device_create_file(dev, &dev_attr_suspend_standby_state);
2240 if (status < 0)
2241 return status;
2242 status = device_create_file(dev, &dev_attr_suspend_mem_state);
2243 if (status < 0)
2244 return status;
2245 status = device_create_file(dev, &dev_attr_suspend_disk_state);
2246 if (status < 0)
2247 return status;
2248
2249 if (ops->set_suspend_voltage) {
2250 status = device_create_file(dev,
2251 &dev_attr_suspend_standby_microvolts);
2252 if (status < 0)
2253 return status;
2254 status = device_create_file(dev,
2255 &dev_attr_suspend_mem_microvolts);
2256 if (status < 0)
2257 return status;
2258 status = device_create_file(dev,
2259 &dev_attr_suspend_disk_microvolts);
2260 if (status < 0)
2261 return status;
2262 }
2263
2264 if (ops->set_suspend_mode) {
2265 status = device_create_file(dev,
2266 &dev_attr_suspend_standby_mode);
2267 if (status < 0)
2268 return status;
2269 status = device_create_file(dev,
2270 &dev_attr_suspend_mem_mode);
2271 if (status < 0)
2272 return status;
2273 status = device_create_file(dev,
2274 &dev_attr_suspend_disk_mode);
2275 if (status < 0)
2276 return status;
2277 }
2278
2279 return status;
2280}
2281
414c70cb
LG		 2282/**
2283 * regulator_register - register regulator
69279fb9
MB		 2284 * @regulator_desc: regulator to register
2285 * @dev: struct device for the regulator
0527100f 2286 * @init_data: platform provided init data, passed through by driver
69279fb9 2287 * @driver_data: private regulator data
414c70cb
LG		 2288 *
2289 * Called by regulator drivers to register a regulator.
2290 * Returns 0 on success.
2291 */
2292struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
0527100f
MB		 2293 struct device *dev, struct regulator_init_data *init_data,
2294 void *driver_data)
414c70cb
LG		 2295{
2296 static atomic_t regulator_no = ATOMIC_INIT(0);
2297 struct regulator_dev *rdev;
a5766f11 2298 int ret, i;
414c70cb
LG		 2299
2300 if (regulator_desc == NULL)
2301 return ERR_PTR(-EINVAL);
2302
2303 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2304 return ERR_PTR(-EINVAL);
2305
cd78dfc6
DL		 2306 if (regulator_desc->type != REGULATOR_VOLTAGE &&
2307 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 2308 return ERR_PTR(-EINVAL);
2309
46fabe1e
MB		 2310 if (!init_data)
2311 return ERR_PTR(-EINVAL);
2312
414c70cb
LG		 2313 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2314 if (rdev == NULL)
2315 return ERR_PTR(-ENOMEM);
2316
2317 mutex_lock(&regulator_list_mutex);
2318
2319 mutex_init(&rdev->mutex);
a5766f11 2320 rdev->reg_data = driver_data;
414c70cb
LG		 2321 rdev->owner = regulator_desc->owner;
2322 rdev->desc = regulator_desc;
2323 INIT_LIST_HEAD(&rdev->consumer_list);
2324 INIT_LIST_HEAD(&rdev->supply_list);
2325 INIT_LIST_HEAD(&rdev->list);
2326 INIT_LIST_HEAD(&rdev->slist);
2327 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2328
a5766f11
LG		 2329 /* preform any regulator specific init */
2330 if (init_data->regulator_init) {
2331 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 2332 if (ret < 0)
2333 goto clean;
a5766f11
LG		 2334 }
2335
a5766f11 2336 /* register with sysfs */
414c70cb 2337 rdev->dev.class = &regulator_class;
a5766f11 2338 rdev->dev.parent = dev;
812460a9
KS		 2339 dev_set_name(&rdev->dev, "regulator.%d",
2340 atomic_inc_return(&regulator_no) - 1);
a5766f11 2341 ret = device_register(&rdev->dev);
ad7725cb
VK		 2342 if (ret != 0) {
2343 put_device(&rdev->dev);
4fca9545 2344 goto clean;
ad7725cb 2345 }
a5766f11
LG		 2346
2347 dev_set_drvdata(&rdev->dev, rdev);
2348
74f544c1
MR		 2349 /* set regulator constraints */
2350 ret = set_machine_constraints(rdev, &init_data->constraints);
2351 if (ret < 0)
2352 goto scrub;
2353
7ad68e2f
DB		 2354 /* add attributes supported by this regulator */
2355 ret = add_regulator_attributes(rdev);
2356 if (ret < 0)
2357 goto scrub;
2358
a5766f11 2359 /* set supply regulator if it exists */
0178f3e2
MB		 2360 if (init_data->supply_regulator && init_data->supply_regulator_dev) {
2361 dev_err(dev,
2362 "Supply regulator specified by both name and dev\n");
7727da22 2363 ret = -EINVAL;
0178f3e2
MB		 2364 goto scrub;
2365 }
2366
2367 if (init_data->supply_regulator) {
2368 struct regulator_dev *r;
2369 int found = 0;
2370
2371 list_for_each_entry(r, &regulator_list, list) {
2372 if (strcmp(rdev_get_name(r),
2373 init_data->supply_regulator) == 0) {
2374 found = 1;
2375 break;
2376 }
2377 }
2378
2379 if (!found) {
2380 dev_err(dev, "Failed to find supply %s\n",
2381 init_data->supply_regulator);
7727da22 2382 ret = -ENODEV;
0178f3e2
MB		 2383 goto scrub;
2384 }
2385
2386 ret = set_supply(rdev, r);
2387 if (ret < 0)
2388 goto scrub;
2389 }
2390
a5766f11 2391 if (init_data->supply_regulator_dev) {
0178f3e2 2392 dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n");
a5766f11
LG		 2393 ret = set_supply(rdev,
2394 dev_get_drvdata(init_data->supply_regulator_dev));
4fca9545
DB		 2395 if (ret < 0)
2396 goto scrub;
a5766f11
LG		 2397 }
2398
2399 /* add consumers devices */
2400 for (i = 0; i < init_data->num_consumer_supplies; i++) {
2401 ret = set_consumer_device_supply(rdev,
2402 init_data->consumer_supplies[i].dev,
40f9244f 2403 init_data->consumer_supplies[i].dev_name,
a5766f11 2404 init_data->consumer_supplies[i].supply);
d4033b54
JN		 2405 if (ret < 0)
2406 goto unset_supplies;
414c70cb 2407 }
a5766f11
LG		 2408
2409 list_add(&rdev->list, &regulator_list);
2410out:
414c70cb
LG		 2411 mutex_unlock(&regulator_list_mutex);
2412 return rdev;
4fca9545 2413
d4033b54
JN		 2414unset_supplies:
2415 unset_regulator_supplies(rdev);
2416
4fca9545
DB		 2417scrub:
2418 device_unregister(&rdev->dev);
53032daf
PW		 2419 /* device core frees rdev */
2420 rdev = ERR_PTR(ret);
2421 goto out;
2422
4fca9545
DB		 2423clean:
2424 kfree(rdev);
2425 rdev = ERR_PTR(ret);
2426 goto out;
414c70cb
LG		 2427}
2428EXPORT_SYMBOL_GPL(regulator_register);
2429
2430/**
2431 * regulator_unregister - unregister regulator
69279fb9 2432 * @rdev: regulator to unregister
414c70cb
LG		 2433 *
2434 * Called by regulator drivers to unregister a regulator.
2435 */
2436void regulator_unregister(struct regulator_dev *rdev)
2437{
2438 if (rdev == NULL)
2439 return;
2440
2441 mutex_lock(&regulator_list_mutex);
6bf87d17 2442 WARN_ON(rdev->open_count);
0f1d747b 2443 unset_regulator_supplies(rdev);
414c70cb
LG		 2444 list_del(&rdev->list);
2445 if (rdev->supply)
2446 sysfs_remove_link(&rdev->dev.kobj, "supply");
2447 device_unregister(&rdev->dev);
2448 mutex_unlock(&regulator_list_mutex);
2449}
2450EXPORT_SYMBOL_GPL(regulator_unregister);
2451
414c70cb 2452/**
cf7bbcdf 2453 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 2454 * @state: system suspend state
2455 *
2456 * Configure each regulator with it's suspend operating parameters for state.
2457 * This will usually be called by machine suspend code prior to supending.
2458 */
2459int regulator_suspend_prepare(suspend_state_t state)
2460{
2461 struct regulator_dev *rdev;
2462 int ret = 0;
2463
2464 /* ON is handled by regulator active state */
2465 if (state == PM_SUSPEND_ON)
2466 return -EINVAL;
2467
2468 mutex_lock(&regulator_list_mutex);
2469 list_for_each_entry(rdev, &regulator_list, list) {
2470
2471 mutex_lock(&rdev->mutex);
2472 ret = suspend_prepare(rdev, state);
2473 mutex_unlock(&rdev->mutex);
2474
2475 if (ret < 0) {
2476 printk(KERN_ERR "%s: failed to prepare %s\n",
1083c393 2477 __func__, rdev_get_name(rdev));
414c70cb
LG		 2478 goto out;
2479 }
2480 }
2481out:
2482 mutex_unlock(&regulator_list_mutex);
2483 return ret;
2484}
2485EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2486
ca725561
MB		 2487/**
2488 * regulator_has_full_constraints - the system has fully specified constraints
2489 *
2490 * Calling this function will cause the regulator API to disable all
2491 * regulators which have a zero use count and don't have an always_on
2492 * constraint in a late_initcall.
2493 *
2494 * The intention is that this will become the default behaviour in a
2495 * future kernel release so users are encouraged to use this facility
2496 * now.
2497 */
2498void regulator_has_full_constraints(void)
2499{
2500 has_full_constraints = 1;
2501}
2502EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
2503
688fe99a
MB		 2504/**
2505 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
2506 *
2507 * Calling this function will cause the regulator API to provide a
2508 * dummy regulator to consumers if no physical regulator is found,
2509 * allowing most consumers to proceed as though a regulator were
2510 * configured. This allows systems such as those with software
2511 * controllable regulators for the CPU core only to be brought up more
2512 * readily.
2513 */
2514void regulator_use_dummy_regulator(void)
2515{
2516 board_wants_dummy_regulator = true;
2517}
2518EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
2519
414c70cb
LG		 2520/**
2521 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 2522 * @rdev: regulator
414c70cb
LG		 2523 *
2524 * Get rdev regulator driver private data. This call can be used in the
2525 * regulator driver context.
2526 */
2527void *rdev_get_drvdata(struct regulator_dev *rdev)
2528{
2529 return rdev->reg_data;
2530}
2531EXPORT_SYMBOL_GPL(rdev_get_drvdata);
2532
2533/**
2534 * regulator_get_drvdata - get regulator driver data
2535 * @regulator: regulator
2536 *
2537 * Get regulator driver private data. This call can be used in the consumer
2538 * driver context when non API regulator specific functions need to be called.
2539 */
2540void *regulator_get_drvdata(struct regulator *regulator)
2541{
2542 return regulator->rdev->reg_data;
2543}
2544EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2545
2546/**
2547 * regulator_set_drvdata - set regulator driver data
2548 * @regulator: regulator
2549 * @data: data
2550 */
2551void regulator_set_drvdata(struct regulator *regulator, void *data)
2552{
2553 regulator->rdev->reg_data = data;
2554}
2555EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2556
2557/**
2558 * regulator_get_id - get regulator ID
69279fb9 2559 * @rdev: regulator
414c70cb
LG		 2560 */
2561int rdev_get_id(struct regulator_dev *rdev)
2562{
2563 return rdev->desc->id;
2564}
2565EXPORT_SYMBOL_GPL(rdev_get_id);
2566
a5766f11
LG		 2567struct device *rdev_get_dev(struct regulator_dev *rdev)
2568{
2569 return &rdev->dev;
2570}
2571EXPORT_SYMBOL_GPL(rdev_get_dev);
2572
2573void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2574{
2575 return reg_init_data->driver_data;
2576}
2577EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2578
414c70cb
LG		 2579static int __init regulator_init(void)
2580{
34abbd68
MB		 2581 int ret;
2582
414c70cb 2583 printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION);
34abbd68
MB		 2584
2585 ret = class_register(&regulator_class);
2586
2587 regulator_dummy_init();
2588
2589 return ret;
414c70cb
LG		 2590}
2591
2592/* init early to allow our consumers to complete system booting */
2593core_initcall(regulator_init);
ca725561
MB		 2594
2595static int __init regulator_init_complete(void)
2596{
2597 struct regulator_dev *rdev;
2598 struct regulator_ops *ops;
2599 struct regulation_constraints *c;
2600 int enabled, ret;
2601 const char *name;
2602
2603 mutex_lock(&regulator_list_mutex);
2604
2605 /* If we have a full configuration then disable any regulators
2606 * which are not in use or always_on. This will become the
2607 * default behaviour in the future.
2608 */
2609 list_for_each_entry(rdev, &regulator_list, list) {
2610 ops = rdev->desc->ops;
2611 c = rdev->constraints;
2612
1083c393 2613 name = rdev_get_name(rdev);
ca725561 2614
f25e0b4f 2615 if (!ops->disable || (c && c->always_on))
ca725561
MB		 2616 continue;
2617
2618 mutex_lock(&rdev->mutex);
2619
2620 if (rdev->use_count)
2621 goto unlock;
2622
2623 /* If we can't read the status assume it's on. */
2624 if (ops->is_enabled)
2625 enabled = ops->is_enabled(rdev);
2626 else
2627 enabled = 1;
2628
2629 if (!enabled)
2630 goto unlock;
2631
2632 if (has_full_constraints) {
2633 /* We log since this may kill the system if it
2634 * goes wrong. */
2635 printk(KERN_INFO "%s: disabling %s\n",
2636 __func__, name);
2637 ret = ops->disable(rdev);
2638 if (ret != 0) {
2639 printk(KERN_ERR
2640 "%s: couldn't disable %s: %d\n",
2641 __func__, name, ret);
2642 }
2643 } else {
2644 /* The intention is that in future we will
2645 * assume that full constraints are provided
2646 * so warn even if we aren't going to do
2647 * anything here.
2648 */
2649 printk(KERN_WARNING
2650 "%s: incomplete constraints, leaving %s on\n",
2651 __func__, name);
2652 }
2653
2654unlock:
2655 mutex_unlock(&rdev->mutex);
2656 }
2657
2658 mutex_unlock(&regulator_list_mutex);
2659
2660 return 0;
2661}
2662late_initcall(regulator_init_complete);
kernel source for telekom puls (alcatel/mediatek)