blob: 48385318175a83fe17208e099caa46c07a01d2f2 [file] [log] [blame]
Liam Girdwood414c70c2008-04-30 15:59:04 +01001/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
Liam Girdwooda5766f12008-10-10 13:22:20 +01005 * Copyright 2008 SlimLogic Ltd.
Liam Girdwood414c70c2008-04-30 15:59:04 +01006 *
Liam Girdwooda5766f12008-10-10 13:22:20 +01007 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
Liam Girdwood414c70c2008-04-30 15:59:04 +01008 *
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>
Mark Brown1130e5b2010-12-21 23:49:31 +000018#include <linux/debugfs.h>
Liam Girdwood414c70c2008-04-30 15:59:04 +010019#include <linux/device.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Mark Brownf21e0e82011-05-24 08:12:40 +080021#include <linux/async.h>
Liam Girdwood414c70c2008-04-30 15:59:04 +010022#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
Mark Brown31aae2b2009-12-21 12:21:52 +000025#include <linux/delay.h>
Mark Brown65f73502012-06-27 14:14:38 +010026#include <linux/gpio.h>
Rajendra Nayak69511a42011-11-18 16:47:20 +053027#include <linux/of.h>
Mark Brown65b19ce2012-04-15 11:16:05 +010028#include <linux/regmap.h>
Rajendra Nayak69511a42011-11-18 16:47:20 +053029#include <linux/regulator/of_regulator.h>
Liam Girdwood414c70c2008-04-30 15:59:04 +010030#include <linux/regulator/consumer.h>
31#include <linux/regulator/driver.h>
32#include <linux/regulator/machine.h>
Paul Gortmaker65602c32011-07-17 16:28:23 -040033#include <linux/module.h>
Liam Girdwood414c70c2008-04-30 15:59:04 +010034
Mark Brown02fa3ec2010-11-10 14:38:30 +000035#define CREATE_TRACE_POINTS
36#include <trace/events/regulator.h>
37
Mark Brown34abbd62010-02-12 10:18:08 +000038#include "dummy.h"
39
Mark Brown7d51a0d2011-06-09 16:06:37 +010040#define rdev_crit(rdev, fmt, ...) \
41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
Joe Perches5da84fd2010-11-30 05:53:48 -080042#define rdev_err(rdev, fmt, ...) \
43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44#define rdev_warn(rdev, fmt, ...) \
45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_info(rdev, fmt, ...) \
47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_dbg(rdev, fmt, ...) \
49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50
Liam Girdwood414c70c2008-04-30 15:59:04 +010051static DEFINE_MUTEX(regulator_list_mutex);
52static LIST_HEAD(regulator_list);
53static LIST_HEAD(regulator_map_list);
Mark Brown21cf8912010-12-21 23:30:07 +000054static bool has_full_constraints;
Mark Brown688fe992010-10-05 19:18:32 -070055static bool board_wants_dummy_regulator;
Liam Girdwood414c70c2008-04-30 15:59:04 +010056
Mark Brown1130e5b2010-12-21 23:49:31 +000057static struct dentry *debugfs_root;
Mark Brown1130e5b2010-12-21 23:49:31 +000058
Mark Brown8dc53902008-12-31 12:52:40 +000059/*
Liam Girdwood414c70c2008-04-30 15:59:04 +010060 * struct regulator_map
61 *
62 * Used to provide symbolic supply names to devices.
63 */
64struct regulator_map {
65 struct list_head list;
Mark Brown40f92442009-06-17 17:56:39 +010066 const char *dev_name; /* The dev_name() for the consumer */
Liam Girdwood414c70c2008-04-30 15:59:04 +010067 const char *supply;
Liam Girdwooda5766f12008-10-10 13:22:20 +010068 struct regulator_dev *regulator;
Liam Girdwood414c70c2008-04-30 15:59:04 +010069};
70
Liam Girdwood414c70c2008-04-30 15:59:04 +010071/*
72 * struct regulator
73 *
74 * One for each consumer device.
75 */
76struct regulator {
77 struct device *dev;
78 struct list_head list;
Mark Brown6492bc12012-04-19 13:19:07 +010079 unsigned int always_on:1;
Liam Girdwood414c70c2008-04-30 15:59:04 +010080 int uA_load;
81 int min_uV;
82 int max_uV;
Liam Girdwood414c70c2008-04-30 15:59:04 +010083 char *supply_name;
84 struct device_attribute dev_attr;
85 struct regulator_dev *rdev;
Mark Brown5de70512011-06-19 13:33:16 +010086 struct dentry *debugfs;
Liam Girdwood414c70c2008-04-30 15:59:04 +010087};
88
89static int _regulator_is_enabled(struct regulator_dev *rdev);
Mark Brown3801b862011-06-09 16:22:22 +010090static int _regulator_disable(struct regulator_dev *rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +010091static int _regulator_get_voltage(struct regulator_dev *rdev);
92static int _regulator_get_current_limit(struct regulator_dev *rdev);
93static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
94static void _notifier_call_chain(struct regulator_dev *rdev,
95 unsigned long event, void *data);
Mark Brown75790252010-12-12 14:25:50 +000096static int _regulator_do_set_voltage(struct regulator_dev *rdev,
97 int min_uV, int max_uV);
Mark Brown3801b862011-06-09 16:22:22 +010098static struct regulator *create_regulator(struct regulator_dev *rdev,
99 struct device *dev,
100 const char *supply_name);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100101
Mark Brown1083c392009-10-22 16:31:32 +0100102static const char *rdev_get_name(struct regulator_dev *rdev)
103{
104 if (rdev->constraints && rdev->constraints->name)
105 return rdev->constraints->name;
106 else if (rdev->desc->name)
107 return rdev->desc->name;
108 else
109 return "";
110}
111
Rajendra Nayak69511a42011-11-18 16:47:20 +0530112/**
113 * of_get_regulator - get a regulator device node based on supply name
114 * @dev: Device pointer for the consumer (of regulator) device
115 * @supply: regulator supply name
116 *
117 * Extract the regulator device node corresponding to the supply name.
118 * retruns the device node corresponding to the regulator if found, else
119 * returns NULL.
120 */
121static struct device_node *of_get_regulator(struct device *dev, const char *supply)
122{
123 struct device_node *regnode = NULL;
124 char prop_name[32]; /* 32 is max size of property name */
125
126 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
127
128 snprintf(prop_name, 32, "%s-supply", supply);
129 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
130
131 if (!regnode) {
Rajendra Nayak16fbcc32012-03-16 15:50:21 +0530132 dev_dbg(dev, "Looking up %s property in node %s failed",
Rajendra Nayak69511a42011-11-18 16:47:20 +0530133 prop_name, dev->of_node->full_name);
134 return NULL;
135 }
136 return regnode;
137}
138
Mark Brown6492bc12012-04-19 13:19:07 +0100139static int _regulator_can_change_status(struct regulator_dev *rdev)
140{
141 if (!rdev->constraints)
142 return 0;
143
144 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
145 return 1;
146 else
147 return 0;
148}
149
Liam Girdwood414c70c2008-04-30 15:59:04 +0100150/* Platform voltage constraint check */
151static int regulator_check_voltage(struct regulator_dev *rdev,
152 int *min_uV, int *max_uV)
153{
154 BUG_ON(*min_uV > *max_uV);
155
156 if (!rdev->constraints) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800157 rdev_err(rdev, "no constraints\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100158 return -ENODEV;
159 }
160 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800161 rdev_err(rdev, "operation not allowed\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100162 return -EPERM;
163 }
164
165 if (*max_uV > rdev->constraints->max_uV)
166 *max_uV = rdev->constraints->max_uV;
167 if (*min_uV < rdev->constraints->min_uV)
168 *min_uV = rdev->constraints->min_uV;
169
Mark Brown89f425e2011-07-12 11:20:37 +0900170 if (*min_uV > *max_uV) {
171 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
Mark Brown54abd332011-07-21 15:07:37 +0100172 *min_uV, *max_uV);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100173 return -EINVAL;
Mark Brown89f425e2011-07-12 11:20:37 +0900174 }
Liam Girdwood414c70c2008-04-30 15:59:04 +0100175
176 return 0;
177}
178
Thomas Petazzoni05fda3b1a2010-12-03 11:31:07 +0100179/* Make sure we select a voltage that suits the needs of all
180 * regulator consumers
181 */
182static int regulator_check_consumers(struct regulator_dev *rdev,
183 int *min_uV, int *max_uV)
184{
185 struct regulator *regulator;
186
187 list_for_each_entry(regulator, &rdev->consumer_list, list) {
Mark Brown4aa922c2011-05-14 13:42:34 -0700188 /*
189 * Assume consumers that didn't say anything are OK
190 * with anything in the constraint range.
191 */
192 if (!regulator->min_uV && !regulator->max_uV)
193 continue;
194
Thomas Petazzoni05fda3b1a2010-12-03 11:31:07 +0100195 if (*max_uV > regulator->max_uV)
196 *max_uV = regulator->max_uV;
197 if (*min_uV < regulator->min_uV)
198 *min_uV = regulator->min_uV;
199 }
200
201 if (*min_uV > *max_uV)
202 return -EINVAL;
203
204 return 0;
205}
206
Liam Girdwood414c70c2008-04-30 15:59:04 +0100207/* current constraint check */
208static int regulator_check_current_limit(struct regulator_dev *rdev,
209 int *min_uA, int *max_uA)
210{
211 BUG_ON(*min_uA > *max_uA);
212
213 if (!rdev->constraints) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800214 rdev_err(rdev, "no constraints\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100215 return -ENODEV;
216 }
217 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800218 rdev_err(rdev, "operation not allowed\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100219 return -EPERM;
220 }
221
222 if (*max_uA > rdev->constraints->max_uA)
223 *max_uA = rdev->constraints->max_uA;
224 if (*min_uA < rdev->constraints->min_uA)
225 *min_uA = rdev->constraints->min_uA;
226
Mark Brown89f425e2011-07-12 11:20:37 +0900227 if (*min_uA > *max_uA) {
228 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
Mark Brown54abd332011-07-21 15:07:37 +0100229 *min_uA, *max_uA);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100230 return -EINVAL;
Mark Brown89f425e2011-07-12 11:20:37 +0900231 }
Liam Girdwood414c70c2008-04-30 15:59:04 +0100232
233 return 0;
234}
235
236/* operating mode constraint check */
Mark Brown2c608232011-03-30 06:29:12 +0900237static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100238{
Mark Brown2c608232011-03-30 06:29:12 +0900239 switch (*mode) {
David Brownelle5735202008-11-16 11:46:56 -0800240 case REGULATOR_MODE_FAST:
241 case REGULATOR_MODE_NORMAL:
242 case REGULATOR_MODE_IDLE:
243 case REGULATOR_MODE_STANDBY:
244 break;
245 default:
Mark Brown89f425e2011-07-12 11:20:37 +0900246 rdev_err(rdev, "invalid mode %x specified\n", *mode);
David Brownelle5735202008-11-16 11:46:56 -0800247 return -EINVAL;
248 }
249
Liam Girdwood414c70c2008-04-30 15:59:04 +0100250 if (!rdev->constraints) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800251 rdev_err(rdev, "no constraints\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100252 return -ENODEV;
253 }
254 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800255 rdev_err(rdev, "operation not allowed\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100256 return -EPERM;
257 }
Mark Brown2c608232011-03-30 06:29:12 +0900258
259 /* The modes are bitmasks, the most power hungry modes having
260 * the lowest values. If the requested mode isn't supported
261 * try higher modes. */
262 while (*mode) {
263 if (rdev->constraints->valid_modes_mask & *mode)
264 return 0;
265 *mode /= 2;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100266 }
Mark Brown2c608232011-03-30 06:29:12 +0900267
268 return -EINVAL;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100269}
270
271/* dynamic regulator mode switching constraint check */
272static int regulator_check_drms(struct regulator_dev *rdev)
273{
274 if (!rdev->constraints) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800275 rdev_err(rdev, "no constraints\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100276 return -ENODEV;
277 }
278 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800279 rdev_err(rdev, "operation not allowed\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100280 return -EPERM;
281 }
282 return 0;
283}
284
Liam Girdwood414c70c2008-04-30 15:59:04 +0100285static ssize_t regulator_uV_show(struct device *dev,
286 struct device_attribute *attr, char *buf)
287{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100288 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100289 ssize_t ret;
290
291 mutex_lock(&rdev->mutex);
292 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
293 mutex_unlock(&rdev->mutex);
294
295 return ret;
296}
David Brownell7ad68e22008-11-11 17:39:02 -0800297static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100298
299static ssize_t regulator_uA_show(struct device *dev,
300 struct device_attribute *attr, char *buf)
301{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100302 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100303
304 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
305}
David Brownell7ad68e22008-11-11 17:39:02 -0800306static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100307
Mark Brownbc558a62008-10-10 15:33:20 +0100308static ssize_t regulator_name_show(struct device *dev,
309 struct device_attribute *attr, char *buf)
310{
311 struct regulator_dev *rdev = dev_get_drvdata(dev);
Mark Brownbc558a62008-10-10 15:33:20 +0100312
Mark Brown1083c392009-10-22 16:31:32 +0100313 return sprintf(buf, "%s\n", rdev_get_name(rdev));
Mark Brownbc558a62008-10-10 15:33:20 +0100314}
315
David Brownell4fca9542008-11-11 17:38:53 -0800316static ssize_t regulator_print_opmode(char *buf, int mode)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100317{
Liam Girdwood414c70c2008-04-30 15:59:04 +0100318 switch (mode) {
319 case REGULATOR_MODE_FAST:
320 return sprintf(buf, "fast\n");
321 case REGULATOR_MODE_NORMAL:
322 return sprintf(buf, "normal\n");
323 case REGULATOR_MODE_IDLE:
324 return sprintf(buf, "idle\n");
325 case REGULATOR_MODE_STANDBY:
326 return sprintf(buf, "standby\n");
327 }
328 return sprintf(buf, "unknown\n");
329}
330
David Brownell4fca9542008-11-11 17:38:53 -0800331static ssize_t regulator_opmode_show(struct device *dev,
332 struct device_attribute *attr, char *buf)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100333{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100334 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100335
David Brownell4fca9542008-11-11 17:38:53 -0800336 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
337}
David Brownell7ad68e22008-11-11 17:39:02 -0800338static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
David Brownell4fca9542008-11-11 17:38:53 -0800339
340static ssize_t regulator_print_state(char *buf, int state)
341{
Liam Girdwood414c70c2008-04-30 15:59:04 +0100342 if (state > 0)
343 return sprintf(buf, "enabled\n");
344 else if (state == 0)
345 return sprintf(buf, "disabled\n");
346 else
347 return sprintf(buf, "unknown\n");
348}
349
David Brownell4fca9542008-11-11 17:38:53 -0800350static ssize_t regulator_state_show(struct device *dev,
351 struct device_attribute *attr, char *buf)
352{
353 struct regulator_dev *rdev = dev_get_drvdata(dev);
Mark Brown93325462009-08-03 18:49:56 +0100354 ssize_t ret;
David Brownell4fca9542008-11-11 17:38:53 -0800355
Mark Brown93325462009-08-03 18:49:56 +0100356 mutex_lock(&rdev->mutex);
357 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
358 mutex_unlock(&rdev->mutex);
359
360 return ret;
David Brownell4fca9542008-11-11 17:38:53 -0800361}
David Brownell7ad68e22008-11-11 17:39:02 -0800362static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
David Brownell4fca9542008-11-11 17:38:53 -0800363
David Brownell853116a2009-01-14 23:03:17 -0800364static ssize_t regulator_status_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
366{
367 struct regulator_dev *rdev = dev_get_drvdata(dev);
368 int status;
369 char *label;
370
371 status = rdev->desc->ops->get_status(rdev);
372 if (status < 0)
373 return status;
374
375 switch (status) {
376 case REGULATOR_STATUS_OFF:
377 label = "off";
378 break;
379 case REGULATOR_STATUS_ON:
380 label = "on";
381 break;
382 case REGULATOR_STATUS_ERROR:
383 label = "error";
384 break;
385 case REGULATOR_STATUS_FAST:
386 label = "fast";
387 break;
388 case REGULATOR_STATUS_NORMAL:
389 label = "normal";
390 break;
391 case REGULATOR_STATUS_IDLE:
392 label = "idle";
393 break;
394 case REGULATOR_STATUS_STANDBY:
395 label = "standby";
396 break;
Krystian Garbaciak1beaf762012-07-12 13:53:35 +0100397 case REGULATOR_STATUS_UNDEFINED:
398 label = "undefined";
399 break;
David Brownell853116a2009-01-14 23:03:17 -0800400 default:
401 return -ERANGE;
402 }
403
404 return sprintf(buf, "%s\n", label);
405}
406static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
407
Liam Girdwood414c70c2008-04-30 15:59:04 +0100408static ssize_t regulator_min_uA_show(struct device *dev,
409 struct device_attribute *attr, char *buf)
410{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100411 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100412
413 if (!rdev->constraints)
414 return sprintf(buf, "constraint not defined\n");
415
416 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
417}
David Brownell7ad68e22008-11-11 17:39:02 -0800418static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100419
420static ssize_t regulator_max_uA_show(struct device *dev,
421 struct device_attribute *attr, char *buf)
422{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100423 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100424
425 if (!rdev->constraints)
426 return sprintf(buf, "constraint not defined\n");
427
428 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
429}
David Brownell7ad68e22008-11-11 17:39:02 -0800430static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100431
432static ssize_t regulator_min_uV_show(struct device *dev,
433 struct device_attribute *attr, char *buf)
434{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100435 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100436
437 if (!rdev->constraints)
438 return sprintf(buf, "constraint not defined\n");
439
440 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
441}
David Brownell7ad68e22008-11-11 17:39:02 -0800442static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100443
444static ssize_t regulator_max_uV_show(struct device *dev,
445 struct device_attribute *attr, char *buf)
446{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100447 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100448
449 if (!rdev->constraints)
450 return sprintf(buf, "constraint not defined\n");
451
452 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
453}
David Brownell7ad68e22008-11-11 17:39:02 -0800454static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100455
456static ssize_t regulator_total_uA_show(struct device *dev,
457 struct device_attribute *attr, char *buf)
458{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100459 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100460 struct regulator *regulator;
461 int uA = 0;
462
463 mutex_lock(&rdev->mutex);
464 list_for_each_entry(regulator, &rdev->consumer_list, list)
Stefan Roesefa2984d2009-11-27 15:56:34 +0100465 uA += regulator->uA_load;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100466 mutex_unlock(&rdev->mutex);
467 return sprintf(buf, "%d\n", uA);
468}
David Brownell7ad68e22008-11-11 17:39:02 -0800469static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100470
471static ssize_t regulator_num_users_show(struct device *dev,
472 struct device_attribute *attr, char *buf)
473{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100474 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100475 return sprintf(buf, "%d\n", rdev->use_count);
476}
477
478static ssize_t regulator_type_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
480{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100481 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100482
483 switch (rdev->desc->type) {
484 case REGULATOR_VOLTAGE:
485 return sprintf(buf, "voltage\n");
486 case REGULATOR_CURRENT:
487 return sprintf(buf, "current\n");
488 }
489 return sprintf(buf, "unknown\n");
490}
491
492static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
493 struct device_attribute *attr, char *buf)
494{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100495 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100496
Liam Girdwood414c70c2008-04-30 15:59:04 +0100497 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
498}
David Brownell7ad68e22008-11-11 17:39:02 -0800499static DEVICE_ATTR(suspend_mem_microvolts, 0444,
500 regulator_suspend_mem_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100501
502static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
503 struct device_attribute *attr, char *buf)
504{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100505 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100506
Liam Girdwood414c70c2008-04-30 15:59:04 +0100507 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
508}
David Brownell7ad68e22008-11-11 17:39:02 -0800509static DEVICE_ATTR(suspend_disk_microvolts, 0444,
510 regulator_suspend_disk_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100511
512static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
513 struct device_attribute *attr, char *buf)
514{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100515 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100516
Liam Girdwood414c70c2008-04-30 15:59:04 +0100517 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
518}
David Brownell7ad68e22008-11-11 17:39:02 -0800519static DEVICE_ATTR(suspend_standby_microvolts, 0444,
520 regulator_suspend_standby_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100521
Liam Girdwood414c70c2008-04-30 15:59:04 +0100522static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
523 struct device_attribute *attr, char *buf)
524{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100525 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100526
David Brownell4fca9542008-11-11 17:38:53 -0800527 return regulator_print_opmode(buf,
528 rdev->constraints->state_mem.mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100529}
David Brownell7ad68e22008-11-11 17:39:02 -0800530static DEVICE_ATTR(suspend_mem_mode, 0444,
531 regulator_suspend_mem_mode_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100532
533static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
534 struct device_attribute *attr, char *buf)
535{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100536 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100537
David Brownell4fca9542008-11-11 17:38:53 -0800538 return regulator_print_opmode(buf,
539 rdev->constraints->state_disk.mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100540}
David Brownell7ad68e22008-11-11 17:39:02 -0800541static DEVICE_ATTR(suspend_disk_mode, 0444,
542 regulator_suspend_disk_mode_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100543
544static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
545 struct device_attribute *attr, char *buf)
546{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100547 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100548
David Brownell4fca9542008-11-11 17:38:53 -0800549 return regulator_print_opmode(buf,
550 rdev->constraints->state_standby.mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100551}
David Brownell7ad68e22008-11-11 17:39:02 -0800552static DEVICE_ATTR(suspend_standby_mode, 0444,
553 regulator_suspend_standby_mode_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100554
555static ssize_t regulator_suspend_mem_state_show(struct device *dev,
556 struct device_attribute *attr, char *buf)
557{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100558 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100559
David Brownell4fca9542008-11-11 17:38:53 -0800560 return regulator_print_state(buf,
561 rdev->constraints->state_mem.enabled);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100562}
David Brownell7ad68e22008-11-11 17:39:02 -0800563static DEVICE_ATTR(suspend_mem_state, 0444,
564 regulator_suspend_mem_state_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100565
566static ssize_t regulator_suspend_disk_state_show(struct device *dev,
567 struct device_attribute *attr, char *buf)
568{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100569 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100570
David Brownell4fca9542008-11-11 17:38:53 -0800571 return regulator_print_state(buf,
572 rdev->constraints->state_disk.enabled);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100573}
David Brownell7ad68e22008-11-11 17:39:02 -0800574static DEVICE_ATTR(suspend_disk_state, 0444,
575 regulator_suspend_disk_state_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100576
577static ssize_t regulator_suspend_standby_state_show(struct device *dev,
578 struct device_attribute *attr, char *buf)
579{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100580 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100581
David Brownell4fca9542008-11-11 17:38:53 -0800582 return regulator_print_state(buf,
583 rdev->constraints->state_standby.enabled);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100584}
David Brownell7ad68e22008-11-11 17:39:02 -0800585static DEVICE_ATTR(suspend_standby_state, 0444,
586 regulator_suspend_standby_state_show, NULL);
Mark Brownbc558a62008-10-10 15:33:20 +0100587
David Brownell7ad68e22008-11-11 17:39:02 -0800588
589/*
590 * These are the only attributes are present for all regulators.
591 * Other attributes are a function of regulator functionality.
592 */
Liam Girdwood414c70c2008-04-30 15:59:04 +0100593static struct device_attribute regulator_dev_attrs[] = {
Mark Brownbc558a62008-10-10 15:33:20 +0100594 __ATTR(name, 0444, regulator_name_show, NULL),
Liam Girdwood414c70c2008-04-30 15:59:04 +0100595 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
596 __ATTR(type, 0444, regulator_type_show, NULL),
Liam Girdwood414c70c2008-04-30 15:59:04 +0100597 __ATTR_NULL,
598};
599
600static void regulator_dev_release(struct device *dev)
601{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100602 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100603 kfree(rdev);
604}
605
606static struct class regulator_class = {
607 .name = "regulator",
608 .dev_release = regulator_dev_release,
609 .dev_attrs = regulator_dev_attrs,
610};
611
612/* Calculate the new optimum regulator operating mode based on the new total
613 * consumer load. All locks held by caller */
614static void drms_uA_update(struct regulator_dev *rdev)
615{
616 struct regulator *sibling;
617 int current_uA = 0, output_uV, input_uV, err;
618 unsigned int mode;
619
620 err = regulator_check_drms(rdev);
621 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
Mark Brown476c2d82010-12-10 17:28:07 +0000622 (!rdev->desc->ops->get_voltage &&
623 !rdev->desc->ops->get_voltage_sel) ||
624 !rdev->desc->ops->set_mode)
Dan Carpenter036de8e2009-04-08 13:52:39 +0300625 return;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100626
627 /* get output voltage */
Mark Brown1bf5a1f2010-12-10 17:28:06 +0000628 output_uV = _regulator_get_voltage(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100629 if (output_uV <= 0)
630 return;
631
632 /* get input voltage */
Mark Brown1bf5a1f2010-12-10 17:28:06 +0000633 input_uV = 0;
634 if (rdev->supply)
Axel Lin3f24f5a2012-04-13 21:35:05 +0800635 input_uV = regulator_get_voltage(rdev->supply);
Mark Brown1bf5a1f2010-12-10 17:28:06 +0000636 if (input_uV <= 0)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100637 input_uV = rdev->constraints->input_uV;
638 if (input_uV <= 0)
639 return;
640
641 /* calc total requested load */
642 list_for_each_entry(sibling, &rdev->consumer_list, list)
Stefan Roesefa2984d2009-11-27 15:56:34 +0100643 current_uA += sibling->uA_load;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100644
645 /* now get the optimum mode for our new total regulator load */
646 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
647 output_uV, current_uA);
648
649 /* check the new mode is allowed */
Mark Brown2c608232011-03-30 06:29:12 +0900650 err = regulator_mode_constrain(rdev, &mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100651 if (err == 0)
652 rdev->desc->ops->set_mode(rdev, mode);
653}
654
655static int suspend_set_state(struct regulator_dev *rdev,
656 struct regulator_state *rstate)
657{
658 int ret = 0;
Mark Brown638f85c2009-10-22 16:31:33 +0100659
660 /* If we have no suspend mode configration don't set anything;
Axel Lin8ac0e952012-04-14 09:14:34 +0800661 * only warn if the driver implements set_suspend_voltage or
662 * set_suspend_mode callback.
Mark Brown638f85c2009-10-22 16:31:33 +0100663 */
664 if (!rstate->enabled && !rstate->disabled) {
Axel Lin8ac0e952012-04-14 09:14:34 +0800665 if (rdev->desc->ops->set_suspend_voltage ||
666 rdev->desc->ops->set_suspend_mode)
Joe Perches5da84fd2010-11-30 05:53:48 -0800667 rdev_warn(rdev, "No configuration\n");
Mark Brown638f85c2009-10-22 16:31:33 +0100668 return 0;
669 }
670
671 if (rstate->enabled && rstate->disabled) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800672 rdev_err(rdev, "invalid configuration\n");
Mark Brown638f85c2009-10-22 16:31:33 +0100673 return -EINVAL;
674 }
675
Axel Lin8ac0e952012-04-14 09:14:34 +0800676 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100677 ret = rdev->desc->ops->set_suspend_enable(rdev);
Axel Lin8ac0e952012-04-14 09:14:34 +0800678 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100679 ret = rdev->desc->ops->set_suspend_disable(rdev);
Axel Lin8ac0e952012-04-14 09:14:34 +0800680 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
681 ret = 0;
682
Liam Girdwood414c70c2008-04-30 15:59:04 +0100683 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800684 rdev_err(rdev, "failed to enabled/disable\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100685 return ret;
686 }
687
688 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
689 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
690 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800691 rdev_err(rdev, "failed to set voltage\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100692 return ret;
693 }
694 }
695
696 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
697 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
698 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800699 rdev_err(rdev, "failed to set mode\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100700 return ret;
701 }
702 }
703 return ret;
704}
705
706/* locks held by caller */
707static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
708{
709 if (!rdev->constraints)
710 return -EINVAL;
711
712 switch (state) {
713 case PM_SUSPEND_STANDBY:
714 return suspend_set_state(rdev,
715 &rdev->constraints->state_standby);
716 case PM_SUSPEND_MEM:
717 return suspend_set_state(rdev,
718 &rdev->constraints->state_mem);
719 case PM_SUSPEND_MAX:
720 return suspend_set_state(rdev,
721 &rdev->constraints->state_disk);
722 default:
723 return -EINVAL;
724 }
725}
726
727static void print_constraints(struct regulator_dev *rdev)
728{
729 struct regulation_constraints *constraints = rdev->constraints;
Mark Brown973e9a22010-02-11 19:20:48 +0000730 char buf[80] = "";
Mark Brown8f031b42009-10-22 16:31:31 +0100731 int count = 0;
732 int ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100733
Mark Brown8f031b42009-10-22 16:31:31 +0100734 if (constraints->min_uV && constraints->max_uV) {
Liam Girdwood414c70c2008-04-30 15:59:04 +0100735 if (constraints->min_uV == constraints->max_uV)
Mark Brown8f031b42009-10-22 16:31:31 +0100736 count += sprintf(buf + count, "%d mV ",
737 constraints->min_uV / 1000);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100738 else
Mark Brown8f031b42009-10-22 16:31:31 +0100739 count += sprintf(buf + count, "%d <--> %d mV ",
740 constraints->min_uV / 1000,
741 constraints->max_uV / 1000);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100742 }
Mark Brown8f031b42009-10-22 16:31:31 +0100743
744 if (!constraints->min_uV ||
745 constraints->min_uV != constraints->max_uV) {
746 ret = _regulator_get_voltage(rdev);
747 if (ret > 0)
748 count += sprintf(buf + count, "at %d mV ", ret / 1000);
749 }
750
Mark Brownbf5892a2011-05-08 22:13:37 +0100751 if (constraints->uV_offset)
752 count += sprintf(buf, "%dmV offset ",
753 constraints->uV_offset / 1000);
754
Mark Brown8f031b42009-10-22 16:31:31 +0100755 if (constraints->min_uA && constraints->max_uA) {
756 if (constraints->min_uA == constraints->max_uA)
757 count += sprintf(buf + count, "%d mA ",
758 constraints->min_uA / 1000);
759 else
760 count += sprintf(buf + count, "%d <--> %d mA ",
761 constraints->min_uA / 1000,
762 constraints->max_uA / 1000);
763 }
764
765 if (!constraints->min_uA ||
766 constraints->min_uA != constraints->max_uA) {
767 ret = _regulator_get_current_limit(rdev);
768 if (ret > 0)
Cyril Chemparathye4a63762010-09-22 12:30:15 -0400769 count += sprintf(buf + count, "at %d mA ", ret / 1000);
Mark Brown8f031b42009-10-22 16:31:31 +0100770 }
771
Liam Girdwood414c70c2008-04-30 15:59:04 +0100772 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
773 count += sprintf(buf + count, "fast ");
774 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
775 count += sprintf(buf + count, "normal ");
776 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
777 count += sprintf(buf + count, "idle ");
778 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
779 count += sprintf(buf + count, "standby");
780
Mark Brown13ce29f2010-12-17 16:04:12 +0000781 rdev_info(rdev, "%s\n", buf);
Mark Brown4a682922012-02-09 13:26:13 +0000782
783 if ((constraints->min_uV != constraints->max_uV) &&
784 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
785 rdev_warn(rdev,
786 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100787}
788
Mark Browne79055d2009-10-19 15:53:50 +0100789static int machine_constraints_voltage(struct regulator_dev *rdev,
Mark Brown1083c392009-10-22 16:31:32 +0100790 struct regulation_constraints *constraints)
Mark Browne79055d2009-10-19 15:53:50 +0100791{
792 struct regulator_ops *ops = rdev->desc->ops;
Mark Brownaf5866c2009-10-22 16:31:30 +0100793 int ret;
794
795 /* do we need to apply the constraint voltage */
796 if (rdev->constraints->apply_uV &&
Mark Brown75790252010-12-12 14:25:50 +0000797 rdev->constraints->min_uV == rdev->constraints->max_uV) {
798 ret = _regulator_do_set_voltage(rdev,
799 rdev->constraints->min_uV,
800 rdev->constraints->max_uV);
801 if (ret < 0) {
802 rdev_err(rdev, "failed to apply %duV constraint\n",
803 rdev->constraints->min_uV);
Mark Brown75790252010-12-12 14:25:50 +0000804 return ret;
805 }
Mark Brownaf5866c2009-10-22 16:31:30 +0100806 }
Mark Browne79055d2009-10-19 15:53:50 +0100807
808 /* constrain machine-level voltage specs to fit
809 * the actual range supported by this regulator.
810 */
811 if (ops->list_voltage && rdev->desc->n_voltages) {
812 int count = rdev->desc->n_voltages;
813 int i;
814 int min_uV = INT_MAX;
815 int max_uV = INT_MIN;
816 int cmin = constraints->min_uV;
817 int cmax = constraints->max_uV;
818
819 /* it's safe to autoconfigure fixed-voltage supplies
820 and the constraints are used by list_voltage. */
821 if (count == 1 && !cmin) {
822 cmin = 1;
823 cmax = INT_MAX;
824 constraints->min_uV = cmin;
825 constraints->max_uV = cmax;
826 }
827
828 /* voltage constraints are optional */
829 if ((cmin == 0) && (cmax == 0))
830 return 0;
831
832 /* else require explicit machine-level constraints */
833 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800834 rdev_err(rdev, "invalid voltage constraints\n");
Mark Browne79055d2009-10-19 15:53:50 +0100835 return -EINVAL;
836 }
837
838 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
839 for (i = 0; i < count; i++) {
840 int value;
841
842 value = ops->list_voltage(rdev, i);
843 if (value <= 0)
844 continue;
845
846 /* maybe adjust [min_uV..max_uV] */
847 if (value >= cmin && value < min_uV)
848 min_uV = value;
849 if (value <= cmax && value > max_uV)
850 max_uV = value;
851 }
852
853 /* final: [min_uV..max_uV] valid iff constraints valid */
854 if (max_uV < min_uV) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800855 rdev_err(rdev, "unsupportable voltage constraints\n");
Mark Browne79055d2009-10-19 15:53:50 +0100856 return -EINVAL;
857 }
858
859 /* use regulator's subset of machine constraints */
860 if (constraints->min_uV < min_uV) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800861 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
862 constraints->min_uV, min_uV);
Mark Browne79055d2009-10-19 15:53:50 +0100863 constraints->min_uV = min_uV;
864 }
865 if (constraints->max_uV > max_uV) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800866 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
867 constraints->max_uV, max_uV);
Mark Browne79055d2009-10-19 15:53:50 +0100868 constraints->max_uV = max_uV;
869 }
870 }
871
872 return 0;
873}
874
Liam Girdwooda5766f12008-10-10 13:22:20 +0100875/**
876 * set_machine_constraints - sets regulator constraints
Mark Brown69279fb2008-12-31 12:52:41 +0000877 * @rdev: regulator source
Mark Brownc8e7e462008-12-31 12:52:42 +0000878 * @constraints: constraints to apply
Liam Girdwooda5766f12008-10-10 13:22:20 +0100879 *
880 * Allows platform initialisation code to define and constrain
881 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
882 * Constraints *must* be set by platform code in order for some
883 * regulator operations to proceed i.e. set_voltage, set_current_limit,
884 * set_mode.
885 */
886static int set_machine_constraints(struct regulator_dev *rdev,
Mark Brownf8c12fe2010-11-29 15:55:17 +0000887 const struct regulation_constraints *constraints)
Liam Girdwooda5766f12008-10-10 13:22:20 +0100888{
889 int ret = 0;
Mark Browne5fda262008-09-09 16:21:20 +0100890 struct regulator_ops *ops = rdev->desc->ops;
Mark Browne06f5b42008-09-09 16:21:19 +0100891
Mark Brown9a8f5e02011-11-29 18:11:19 +0000892 if (constraints)
893 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
894 GFP_KERNEL);
895 else
896 rdev->constraints = kzalloc(sizeof(*constraints),
897 GFP_KERNEL);
Mark Brownf8c12fe2010-11-29 15:55:17 +0000898 if (!rdev->constraints)
899 return -ENOMEM;
Mark Brownaf5866c2009-10-22 16:31:30 +0100900
Mark Brownf8c12fe2010-11-29 15:55:17 +0000901 ret = machine_constraints_voltage(rdev, rdev->constraints);
Mark Browne79055d2009-10-19 15:53:50 +0100902 if (ret != 0)
903 goto out;
David Brownell4367cfd2009-02-26 11:48:36 -0800904
Liam Girdwooda5766f12008-10-10 13:22:20 +0100905 /* do we need to setup our suspend state */
Mark Brown9a8f5e02011-11-29 18:11:19 +0000906 if (rdev->constraints->initial_state) {
Mark Brownf8c12fe2010-11-29 15:55:17 +0000907 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
Mark Browne06f5b42008-09-09 16:21:19 +0100908 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800909 rdev_err(rdev, "failed to set suspend state\n");
Mark Browne06f5b42008-09-09 16:21:19 +0100910 goto out;
911 }
912 }
Liam Girdwooda5766f12008-10-10 13:22:20 +0100913
Mark Brown9a8f5e02011-11-29 18:11:19 +0000914 if (rdev->constraints->initial_mode) {
Mark Browna3084662009-02-26 19:24:19 +0000915 if (!ops->set_mode) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800916 rdev_err(rdev, "no set_mode operation\n");
Mark Browna3084662009-02-26 19:24:19 +0000917 ret = -EINVAL;
918 goto out;
919 }
920
Mark Brownf8c12fe2010-11-29 15:55:17 +0000921 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
Mark Browna3084662009-02-26 19:24:19 +0000922 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800923 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
Mark Browna3084662009-02-26 19:24:19 +0000924 goto out;
925 }
926 }
927
Mark Browncacf90f2009-03-02 16:32:46 +0000928 /* If the constraints say the regulator should be on at this point
929 * and we have control then make sure it is enabled.
930 */
Mark Brownf8c12fe2010-11-29 15:55:17 +0000931 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
932 ops->enable) {
Mark Browne5fda262008-09-09 16:21:20 +0100933 ret = ops->enable(rdev);
934 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800935 rdev_err(rdev, "failed to enable\n");
Mark Browne5fda262008-09-09 16:21:20 +0100936 goto out;
937 }
938 }
939
Yadwinder Singh Brar6f0b2c62012-06-11 17:41:08 +0530940 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) {
941 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
942 if (ret < 0) {
943 rdev_err(rdev, "failed to set ramp_delay\n");
944 goto out;
945 }
946 }
947
Liam Girdwooda5766f12008-10-10 13:22:20 +0100948 print_constraints(rdev);
Axel Lin1a6958e72011-07-15 10:50:43 +0800949 return 0;
Liam Girdwooda5766f12008-10-10 13:22:20 +0100950out:
Axel Lin1a6958e72011-07-15 10:50:43 +0800951 kfree(rdev->constraints);
952 rdev->constraints = NULL;
Liam Girdwooda5766f12008-10-10 13:22:20 +0100953 return ret;
954}
955
956/**
957 * set_supply - set regulator supply regulator
Mark Brown69279fb2008-12-31 12:52:41 +0000958 * @rdev: regulator name
959 * @supply_rdev: supply regulator name
Liam Girdwooda5766f12008-10-10 13:22:20 +0100960 *
961 * Called by platform initialisation code to set the supply regulator for this
962 * regulator. This ensures that a regulators supply will also be enabled by the
963 * core if it's child is enabled.
964 */
965static int set_supply(struct regulator_dev *rdev,
Mark Brown3801b862011-06-09 16:22:22 +0100966 struct regulator_dev *supply_rdev)
Liam Girdwooda5766f12008-10-10 13:22:20 +0100967{
968 int err;
969
Mark Brown3801b862011-06-09 16:22:22 +0100970 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
971
972 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
Axel Lin32c78de2011-12-29 17:03:20 +0800973 if (rdev->supply == NULL) {
974 err = -ENOMEM;
Mark Brown3801b862011-06-09 16:22:22 +0100975 return err;
Liam Girdwooda5766f12008-10-10 13:22:20 +0100976 }
Mark Brown3801b862011-06-09 16:22:22 +0100977
978 return 0;
Liam Girdwooda5766f12008-10-10 13:22:20 +0100979}
980
981/**
Randy Dunlap06c63f92010-11-18 15:02:26 -0800982 * set_consumer_device_supply - Bind a regulator to a symbolic supply
Mark Brown69279fb2008-12-31 12:52:41 +0000983 * @rdev: regulator source
Mark Brown40f92442009-06-17 17:56:39 +0100984 * @consumer_dev_name: dev_name() string for device supply applies to
Mark Brown69279fb2008-12-31 12:52:41 +0000985 * @supply: symbolic name for supply
Liam Girdwooda5766f12008-10-10 13:22:20 +0100986 *
987 * Allows platform initialisation code to map physical regulator
988 * sources to symbolic names for supplies for use by devices. Devices
989 * should use these symbolic names to request regulators, avoiding the
990 * need to provide board-specific regulator names as platform data.
991 */
992static int set_consumer_device_supply(struct regulator_dev *rdev,
Mark Brown737f3602012-02-02 00:10:51 +0000993 const char *consumer_dev_name,
994 const char *supply)
Liam Girdwooda5766f12008-10-10 13:22:20 +0100995{
996 struct regulator_map *node;
Mark Brown9ed20992009-07-21 16:00:26 +0100997 int has_dev;
Liam Girdwooda5766f12008-10-10 13:22:20 +0100998
999 if (supply == NULL)
1000 return -EINVAL;
1001
Mark Brown9ed20992009-07-21 16:00:26 +01001002 if (consumer_dev_name != NULL)
1003 has_dev = 1;
1004 else
1005 has_dev = 0;
1006
David Brownell6001e132008-12-31 12:54:19 +00001007 list_for_each_entry(node, &regulator_map_list, list) {
Jani Nikula23b5cc22010-04-29 10:55:09 +03001008 if (node->dev_name && consumer_dev_name) {
1009 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1010 continue;
1011 } else if (node->dev_name || consumer_dev_name) {
David Brownell6001e132008-12-31 12:54:19 +00001012 continue;
Jani Nikula23b5cc22010-04-29 10:55:09 +03001013 }
1014
David Brownell6001e132008-12-31 12:54:19 +00001015 if (strcmp(node->supply, supply) != 0)
1016 continue;
1017
Mark Brown737f3602012-02-02 00:10:51 +00001018 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1019 consumer_dev_name,
1020 dev_name(&node->regulator->dev),
1021 node->regulator->desc->name,
1022 supply,
1023 dev_name(&rdev->dev), rdev_get_name(rdev));
David Brownell6001e132008-12-31 12:54:19 +00001024 return -EBUSY;
1025 }
1026
Mark Brown9ed20992009-07-21 16:00:26 +01001027 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
Liam Girdwooda5766f12008-10-10 13:22:20 +01001028 if (node == NULL)
1029 return -ENOMEM;
1030
1031 node->regulator = rdev;
Liam Girdwooda5766f12008-10-10 13:22:20 +01001032 node->supply = supply;
1033
Mark Brown9ed20992009-07-21 16:00:26 +01001034 if (has_dev) {
1035 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1036 if (node->dev_name == NULL) {
1037 kfree(node);
1038 return -ENOMEM;
1039 }
Mark Brown40f92442009-06-17 17:56:39 +01001040 }
1041
Liam Girdwooda5766f12008-10-10 13:22:20 +01001042 list_add(&node->list, &regulator_map_list);
1043 return 0;
1044}
1045
Mike Rapoport0f1d7472009-01-22 16:00:29 +02001046static void unset_regulator_supplies(struct regulator_dev *rdev)
1047{
1048 struct regulator_map *node, *n;
1049
1050 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1051 if (rdev == node->regulator) {
1052 list_del(&node->list);
Mark Brown40f92442009-06-17 17:56:39 +01001053 kfree(node->dev_name);
Mike Rapoport0f1d7472009-01-22 16:00:29 +02001054 kfree(node);
Mike Rapoport0f1d7472009-01-22 16:00:29 +02001055 }
1056 }
1057}
1058
Mark Brownf5726ae2011-06-09 16:22:20 +01001059#define REG_STR_SIZE 64
Liam Girdwood414c70c2008-04-30 15:59:04 +01001060
1061static struct regulator *create_regulator(struct regulator_dev *rdev,
1062 struct device *dev,
1063 const char *supply_name)
1064{
1065 struct regulator *regulator;
1066 char buf[REG_STR_SIZE];
1067 int err, size;
1068
1069 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1070 if (regulator == NULL)
1071 return NULL;
1072
1073 mutex_lock(&rdev->mutex);
1074 regulator->rdev = rdev;
1075 list_add(&regulator->list, &rdev->consumer_list);
1076
1077 if (dev) {
Shawn Guoe2c98ea2012-07-05 14:19:42 +08001078 regulator->dev = dev;
1079
Mark Brown222cc7b2012-06-22 11:39:16 +01001080 /* Add a link to the device sysfs entry */
Liam Girdwood414c70c2008-04-30 15:59:04 +01001081 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1082 dev->kobj.name, supply_name);
1083 if (size >= REG_STR_SIZE)
Mark Brown222cc7b2012-06-22 11:39:16 +01001084 goto overflow_err;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001085
1086 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1087 if (regulator->supply_name == NULL)
Mark Brown222cc7b2012-06-22 11:39:16 +01001088 goto overflow_err;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001089
1090 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1091 buf);
1092 if (err) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001093 rdev_warn(rdev, "could not add device link %s err %d\n",
1094 dev->kobj.name, err);
Mark Brown222cc7b2012-06-22 11:39:16 +01001095 /* non-fatal */
Liam Girdwood414c70c2008-04-30 15:59:04 +01001096 }
Mark Brown5de70512011-06-19 13:33:16 +01001097 } else {
1098 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1099 if (regulator->supply_name == NULL)
Mark Brown222cc7b2012-06-22 11:39:16 +01001100 goto overflow_err;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001101 }
Mark Brown5de70512011-06-19 13:33:16 +01001102
Mark Brown5de70512011-06-19 13:33:16 +01001103 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1104 rdev->debugfs);
Stephen Boyd24751432012-02-20 22:50:42 -08001105 if (!regulator->debugfs) {
Mark Brown5de70512011-06-19 13:33:16 +01001106 rdev_warn(rdev, "Failed to create debugfs directory\n");
Mark Brown5de70512011-06-19 13:33:16 +01001107 } else {
1108 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1109 &regulator->uA_load);
1110 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1111 &regulator->min_uV);
1112 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1113 &regulator->max_uV);
1114 }
Mark Brown5de70512011-06-19 13:33:16 +01001115
Mark Brown6492bc12012-04-19 13:19:07 +01001116 /*
1117 * Check now if the regulator is an always on regulator - if
1118 * it is then we don't need to do nearly so much work for
1119 * enable/disable calls.
1120 */
1121 if (!_regulator_can_change_status(rdev) &&
1122 _regulator_is_enabled(rdev))
1123 regulator->always_on = true;
1124
Liam Girdwood414c70c2008-04-30 15:59:04 +01001125 mutex_unlock(&rdev->mutex);
1126 return regulator;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001127overflow_err:
1128 list_del(&regulator->list);
1129 kfree(regulator);
1130 mutex_unlock(&rdev->mutex);
1131 return NULL;
1132}
1133
Mark Brown31aae2b2009-12-21 12:21:52 +00001134static int _regulator_get_enable_time(struct regulator_dev *rdev)
1135{
1136 if (!rdev->desc->ops->enable_time)
Mark Brown79511ed2012-06-27 14:23:10 +01001137 return rdev->desc->enable_time;
Mark Brown31aae2b2009-12-21 12:21:52 +00001138 return rdev->desc->ops->enable_time(rdev);
1139}
1140
Rajendra Nayak69511a42011-11-18 16:47:20 +05301141static struct regulator_dev *regulator_dev_lookup(struct device *dev,
Mark Brown6d191a52012-03-29 14:19:02 +01001142 const char *supply,
1143 int *ret)
Rajendra Nayak69511a42011-11-18 16:47:20 +05301144{
1145 struct regulator_dev *r;
1146 struct device_node *node;
Mark Brown576ca4362012-03-30 12:24:37 +01001147 struct regulator_map *map;
1148 const char *devname = NULL;
Rajendra Nayak69511a42011-11-18 16:47:20 +05301149
1150 /* first do a dt based lookup */
1151 if (dev && dev->of_node) {
1152 node = of_get_regulator(dev, supply);
Mark Brown6d191a52012-03-29 14:19:02 +01001153 if (node) {
Rajendra Nayak69511a42011-11-18 16:47:20 +05301154 list_for_each_entry(r, &regulator_list, list)
1155 if (r->dev.parent &&
1156 node == r->dev.of_node)
1157 return r;
Mark Brown6d191a52012-03-29 14:19:02 +01001158 } else {
1159 /*
1160 * If we couldn't even get the node then it's
1161 * not just that the device didn't register
1162 * yet, there's no node and we'll never
1163 * succeed.
1164 */
1165 *ret = -ENODEV;
1166 }
Rajendra Nayak69511a42011-11-18 16:47:20 +05301167 }
1168
1169 /* if not found, try doing it non-dt way */
Mark Brown576ca4362012-03-30 12:24:37 +01001170 if (dev)
1171 devname = dev_name(dev);
1172
Rajendra Nayak69511a42011-11-18 16:47:20 +05301173 list_for_each_entry(r, &regulator_list, list)
1174 if (strcmp(rdev_get_name(r), supply) == 0)
1175 return r;
1176
Mark Brown576ca4362012-03-30 12:24:37 +01001177 list_for_each_entry(map, &regulator_map_list, list) {
1178 /* If the mapping has a device set up it must match */
1179 if (map->dev_name &&
1180 (!devname || strcmp(map->dev_name, devname)))
1181 continue;
1182
1183 if (strcmp(map->supply, supply) == 0)
1184 return map->regulator;
1185 }
1186
1187
Rajendra Nayak69511a42011-11-18 16:47:20 +05301188 return NULL;
1189}
1190
Mark Brown5ffbd132009-07-21 16:00:23 +01001191/* Internal regulator request function */
1192static struct regulator *_regulator_get(struct device *dev, const char *id,
1193 int exclusive)
Liam Girdwood414c70c2008-04-30 15:59:04 +01001194{
1195 struct regulator_dev *rdev;
Mark Brown04bf3012012-03-11 13:07:56 +00001196 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
Mark Brown40f92442009-06-17 17:56:39 +01001197 const char *devname = NULL;
Mark Brown5ffbd132009-07-21 16:00:23 +01001198 int ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001199
1200 if (id == NULL) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001201 pr_err("get() with no identifier\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +01001202 return regulator;
1203 }
1204
Mark Brown40f92442009-06-17 17:56:39 +01001205 if (dev)
1206 devname = dev_name(dev);
1207
Liam Girdwood414c70c2008-04-30 15:59:04 +01001208 mutex_lock(&regulator_list_mutex);
1209
Mark Brown6d191a52012-03-29 14:19:02 +01001210 rdev = regulator_dev_lookup(dev, id, &ret);
Rajendra Nayak69511a42011-11-18 16:47:20 +05301211 if (rdev)
1212 goto found;
1213
Mark Brown688fe992010-10-05 19:18:32 -07001214 if (board_wants_dummy_regulator) {
1215 rdev = dummy_regulator_rdev;
1216 goto found;
1217 }
1218
Mark Brown34abbd62010-02-12 10:18:08 +00001219#ifdef CONFIG_REGULATOR_DUMMY
1220 if (!devname)
1221 devname = "deviceless";
1222
1223 /* If the board didn't flag that it was fully constrained then
1224 * substitute in a dummy regulator so consumers can continue.
1225 */
1226 if (!has_full_constraints) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001227 pr_warn("%s supply %s not found, using dummy regulator\n",
1228 devname, id);
Mark Brown34abbd62010-02-12 10:18:08 +00001229 rdev = dummy_regulator_rdev;
1230 goto found;
1231 }
1232#endif
1233
Liam Girdwood414c70c2008-04-30 15:59:04 +01001234 mutex_unlock(&regulator_list_mutex);
1235 return regulator;
1236
1237found:
Mark Brown5ffbd132009-07-21 16:00:23 +01001238 if (rdev->exclusive) {
1239 regulator = ERR_PTR(-EPERM);
1240 goto out;
1241 }
1242
1243 if (exclusive && rdev->open_count) {
1244 regulator = ERR_PTR(-EBUSY);
1245 goto out;
1246 }
1247
Liam Girdwooda5766f12008-10-10 13:22:20 +01001248 if (!try_module_get(rdev->owner))
1249 goto out;
1250
Liam Girdwood414c70c2008-04-30 15:59:04 +01001251 regulator = create_regulator(rdev, dev, id);
1252 if (regulator == NULL) {
1253 regulator = ERR_PTR(-ENOMEM);
1254 module_put(rdev->owner);
Axel Linbcda4322011-12-29 17:02:08 +08001255 goto out;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001256 }
1257
Mark Brown5ffbd132009-07-21 16:00:23 +01001258 rdev->open_count++;
1259 if (exclusive) {
1260 rdev->exclusive = 1;
1261
1262 ret = _regulator_is_enabled(rdev);
1263 if (ret > 0)
1264 rdev->use_count = 1;
1265 else
1266 rdev->use_count = 0;
1267 }
1268
Liam Girdwooda5766f12008-10-10 13:22:20 +01001269out:
Liam Girdwood414c70c2008-04-30 15:59:04 +01001270 mutex_unlock(&regulator_list_mutex);
Mark Brown5ffbd132009-07-21 16:00:23 +01001271
Liam Girdwood414c70c2008-04-30 15:59:04 +01001272 return regulator;
1273}
Mark Brown5ffbd132009-07-21 16:00:23 +01001274
1275/**
1276 * regulator_get - lookup and obtain a reference to a regulator.
1277 * @dev: device for regulator "consumer"
1278 * @id: Supply name or regulator ID.
1279 *
1280 * Returns a struct regulator corresponding to the regulator producer,
1281 * or IS_ERR() condition containing errno.
1282 *
1283 * Use of supply names configured via regulator_set_device_supply() is
1284 * strongly encouraged. It is recommended that the supply name used
1285 * should match the name used for the supply and/or the relevant
1286 * device pins in the datasheet.
1287 */
1288struct regulator *regulator_get(struct device *dev, const char *id)
1289{
1290 return _regulator_get(dev, id, 0);
1291}
Liam Girdwood414c70c2008-04-30 15:59:04 +01001292EXPORT_SYMBOL_GPL(regulator_get);
1293
Stephen Boyd070b9072012-01-16 19:39:58 -08001294static void devm_regulator_release(struct device *dev, void *res)
1295{
1296 regulator_put(*(struct regulator **)res);
1297}
1298
1299/**
1300 * devm_regulator_get - Resource managed regulator_get()
1301 * @dev: device for regulator "consumer"
1302 * @id: Supply name or regulator ID.
1303 *
1304 * Managed regulator_get(). Regulators returned from this function are
1305 * automatically regulator_put() on driver detach. See regulator_get() for more
1306 * information.
1307 */
1308struct regulator *devm_regulator_get(struct device *dev, const char *id)
1309{
1310 struct regulator **ptr, *regulator;
1311
1312 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1313 if (!ptr)
1314 return ERR_PTR(-ENOMEM);
1315
1316 regulator = regulator_get(dev, id);
1317 if (!IS_ERR(regulator)) {
1318 *ptr = regulator;
1319 devres_add(dev, ptr);
1320 } else {
1321 devres_free(ptr);
1322 }
1323
1324 return regulator;
1325}
1326EXPORT_SYMBOL_GPL(devm_regulator_get);
1327
Liam Girdwood414c70c2008-04-30 15:59:04 +01001328/**
Mark Brown5ffbd132009-07-21 16:00:23 +01001329 * regulator_get_exclusive - obtain exclusive access to a regulator.
1330 * @dev: device for regulator "consumer"
1331 * @id: Supply name or regulator ID.
1332 *
1333 * Returns a struct regulator corresponding to the regulator producer,
1334 * or IS_ERR() condition containing errno. Other consumers will be
1335 * unable to obtain this reference is held and the use count for the
1336 * regulator will be initialised to reflect the current state of the
1337 * regulator.
1338 *
1339 * This is intended for use by consumers which cannot tolerate shared
1340 * use of the regulator such as those which need to force the
1341 * regulator off for correct operation of the hardware they are
1342 * controlling.
1343 *
1344 * Use of supply names configured via regulator_set_device_supply() is
1345 * strongly encouraged. It is recommended that the supply name used
1346 * should match the name used for the supply and/or the relevant
1347 * device pins in the datasheet.
1348 */
1349struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1350{
1351 return _regulator_get(dev, id, 1);
1352}
1353EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1354
1355/**
Liam Girdwood414c70c2008-04-30 15:59:04 +01001356 * regulator_put - "free" the regulator source
1357 * @regulator: regulator source
1358 *
1359 * Note: drivers must ensure that all regulator_enable calls made on this
1360 * regulator source are balanced by regulator_disable calls prior to calling
1361 * this function.
1362 */
1363void regulator_put(struct regulator *regulator)
1364{
1365 struct regulator_dev *rdev;
1366
1367 if (regulator == NULL || IS_ERR(regulator))
1368 return;
1369
Liam Girdwood414c70c2008-04-30 15:59:04 +01001370 mutex_lock(&regulator_list_mutex);
1371 rdev = regulator->rdev;
1372
Mark Brown5de70512011-06-19 13:33:16 +01001373 debugfs_remove_recursive(regulator->debugfs);
Mark Brown5de70512011-06-19 13:33:16 +01001374
Liam Girdwood414c70c2008-04-30 15:59:04 +01001375 /* remove any sysfs entries */
Shawn Guoe2c98ea2012-07-05 14:19:42 +08001376 if (regulator->dev)
Liam Girdwood414c70c2008-04-30 15:59:04 +01001377 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
Mark Brown5de70512011-06-19 13:33:16 +01001378 kfree(regulator->supply_name);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001379 list_del(&regulator->list);
1380 kfree(regulator);
1381
Mark Brown5ffbd132009-07-21 16:00:23 +01001382 rdev->open_count--;
1383 rdev->exclusive = 0;
1384
Liam Girdwood414c70c2008-04-30 15:59:04 +01001385 module_put(rdev->owner);
1386 mutex_unlock(&regulator_list_mutex);
1387}
1388EXPORT_SYMBOL_GPL(regulator_put);
1389
Mark Brownd5ad34f2012-01-20 20:09:18 +00001390static int devm_regulator_match(struct device *dev, void *res, void *data)
1391{
1392 struct regulator **r = res;
1393 if (!r || !*r) {
1394 WARN_ON(!r || !*r);
1395 return 0;
1396 }
1397 return *r == data;
1398}
1399
1400/**
1401 * devm_regulator_put - Resource managed regulator_put()
1402 * @regulator: regulator to free
1403 *
1404 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1405 * this function will not need to be called and the resource management
1406 * code will ensure that the resource is freed.
1407 */
1408void devm_regulator_put(struct regulator *regulator)
1409{
1410 int rc;
1411
Mark Brown361ff502012-05-07 14:14:30 +01001412 rc = devres_release(regulator->dev, devm_regulator_release,
Mark Brownd5ad34f2012-01-20 20:09:18 +00001413 devm_regulator_match, regulator);
Mark Brown230a5a1c2012-06-15 18:25:08 +01001414 if (rc != 0)
Mark Brown968c2c12012-05-07 11:34:52 +01001415 WARN_ON(rc);
Mark Brownd5ad34f2012-01-20 20:09:18 +00001416}
1417EXPORT_SYMBOL_GPL(devm_regulator_put);
1418
Mark Brown5c5659d2012-06-27 13:21:26 +01001419static int _regulator_do_enable(struct regulator_dev *rdev)
1420{
1421 int ret, delay;
1422
1423 /* Query before enabling in case configuration dependent. */
1424 ret = _regulator_get_enable_time(rdev);
1425 if (ret >= 0) {
1426 delay = ret;
1427 } else {
1428 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1429 delay = 0;
1430 }
1431
1432 trace_regulator_enable(rdev_get_name(rdev));
1433
Mark Brown65f73502012-06-27 14:14:38 +01001434 if (rdev->ena_gpio) {
1435 gpio_set_value_cansleep(rdev->ena_gpio,
1436 !rdev->ena_gpio_invert);
1437 rdev->ena_gpio_state = 1;
1438 } else if (rdev->desc->ops->enable) {
Mark Brown5c5659d2012-06-27 13:21:26 +01001439 ret = rdev->desc->ops->enable(rdev);
1440 if (ret < 0)
1441 return ret;
1442 } else {
1443 return -EINVAL;
1444 }
1445
1446 /* Allow the regulator to ramp; it would be useful to extend
1447 * this for bulk operations so that the regulators can ramp
1448 * together. */
1449 trace_regulator_enable_delay(rdev_get_name(rdev));
1450
1451 if (delay >= 1000) {
1452 mdelay(delay / 1000);
1453 udelay(delay % 1000);
1454 } else if (delay) {
1455 udelay(delay);
1456 }
1457
1458 trace_regulator_enable_complete(rdev_get_name(rdev));
1459
1460 return 0;
1461}
1462
Liam Girdwood414c70c2008-04-30 15:59:04 +01001463/* locks held by regulator_enable() */
1464static int _regulator_enable(struct regulator_dev *rdev)
1465{
Mark Brown5c5659d2012-06-27 13:21:26 +01001466 int ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001467
Liam Girdwood414c70c2008-04-30 15:59:04 +01001468 /* check voltage and requested load before enabling */
Mark Brown9a2372f2009-08-03 18:49:57 +01001469 if (rdev->constraints &&
1470 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1471 drms_uA_update(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001472
Mark Brown9a2372f2009-08-03 18:49:57 +01001473 if (rdev->use_count == 0) {
1474 /* The regulator may on if it's not switchable or left on */
1475 ret = _regulator_is_enabled(rdev);
1476 if (ret == -EINVAL || ret == 0) {
1477 if (!_regulator_can_change_status(rdev))
1478 return -EPERM;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001479
Mark Brown5c5659d2012-06-27 13:21:26 +01001480 ret = _regulator_do_enable(rdev);
Mark Brown31aae2b2009-12-21 12:21:52 +00001481 if (ret < 0)
1482 return ret;
1483
Linus Walleija7433cf2009-08-26 12:54:04 +02001484 } else if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001485 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001486 return ret;
1487 }
Linus Walleija7433cf2009-08-26 12:54:04 +02001488 /* Fallthrough on positive return values - already enabled */
Liam Girdwood414c70c2008-04-30 15:59:04 +01001489 }
1490
Mark Brown9a2372f2009-08-03 18:49:57 +01001491 rdev->use_count++;
1492
1493 return 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001494}
1495
1496/**
1497 * regulator_enable - enable regulator output
1498 * @regulator: regulator source
1499 *
Mark Browncf7bbcd2008-12-31 12:52:43 +00001500 * Request that the regulator be enabled with the regulator output at
1501 * the predefined voltage or current value. Calls to regulator_enable()
1502 * must be balanced with calls to regulator_disable().
1503 *
Liam Girdwood414c70c2008-04-30 15:59:04 +01001504 * NOTE: the output value can be set by other drivers, boot loader or may be
Mark Browncf7bbcd2008-12-31 12:52:43 +00001505 * hardwired in the regulator.
Liam Girdwood414c70c2008-04-30 15:59:04 +01001506 */
1507int regulator_enable(struct regulator *regulator)
1508{
David Brownell412aec62008-11-16 11:44:46 -08001509 struct regulator_dev *rdev = regulator->rdev;
1510 int ret = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001511
Mark Brown6492bc12012-04-19 13:19:07 +01001512 if (regulator->always_on)
1513 return 0;
1514
Mark Brown3801b862011-06-09 16:22:22 +01001515 if (rdev->supply) {
1516 ret = regulator_enable(rdev->supply);
1517 if (ret != 0)
1518 return ret;
1519 }
1520
David Brownell412aec62008-11-16 11:44:46 -08001521 mutex_lock(&rdev->mutex);
David Brownellcd94b502009-03-11 16:43:34 -08001522 ret = _regulator_enable(rdev);
David Brownell412aec62008-11-16 11:44:46 -08001523 mutex_unlock(&rdev->mutex);
Mark Brown3801b862011-06-09 16:22:22 +01001524
Heiko Stübnerd1685e42011-10-14 18:00:29 +02001525 if (ret != 0 && rdev->supply)
Mark Brown3801b862011-06-09 16:22:22 +01001526 regulator_disable(rdev->supply);
1527
Liam Girdwood414c70c2008-04-30 15:59:04 +01001528 return ret;
1529}
1530EXPORT_SYMBOL_GPL(regulator_enable);
1531
Mark Brown5c5659d2012-06-27 13:21:26 +01001532static int _regulator_do_disable(struct regulator_dev *rdev)
1533{
1534 int ret;
1535
1536 trace_regulator_disable(rdev_get_name(rdev));
1537
1538 if (rdev->ena_gpio) {
1539 gpio_set_value_cansleep(rdev->ena_gpio,
1540 rdev->ena_gpio_invert);
1541 rdev->ena_gpio_state = 0;
1542
1543 } else if (rdev->desc->ops->disable) {
1544 ret = rdev->desc->ops->disable(rdev);
1545 if (ret != 0)
1546 return ret;
1547 }
1548
1549 trace_regulator_disable_complete(rdev_get_name(rdev));
1550
1551 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1552 NULL);
1553 return 0;
1554}
1555
Liam Girdwood414c70c2008-04-30 15:59:04 +01001556/* locks held by regulator_disable() */
Mark Brown3801b862011-06-09 16:22:22 +01001557static int _regulator_disable(struct regulator_dev *rdev)
Liam Girdwood414c70c2008-04-30 15:59:04 +01001558{
1559 int ret = 0;
1560
David Brownellcd94b502009-03-11 16:43:34 -08001561 if (WARN(rdev->use_count <= 0,
Joe Perches43e7ee32010-12-06 14:05:19 -08001562 "unbalanced disables for %s\n", rdev_get_name(rdev)))
David Brownellcd94b502009-03-11 16:43:34 -08001563 return -EIO;
1564
Liam Girdwood414c70c2008-04-30 15:59:04 +01001565 /* are we the last user and permitted to disable ? */
Mark Brown60ef66f2009-10-13 13:06:50 +01001566 if (rdev->use_count == 1 &&
1567 (rdev->constraints && !rdev->constraints->always_on)) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01001568
1569 /* we are last user */
Mark Brown5c5659d2012-06-27 13:21:26 +01001570 if (_regulator_can_change_status(rdev)) {
1571 ret = _regulator_do_disable(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001572 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001573 rdev_err(rdev, "failed to disable\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +01001574 return ret;
1575 }
1576 }
1577
Liam Girdwood414c70c2008-04-30 15:59:04 +01001578 rdev->use_count = 0;
1579 } else if (rdev->use_count > 1) {
1580
1581 if (rdev->constraints &&
1582 (rdev->constraints->valid_ops_mask &
1583 REGULATOR_CHANGE_DRMS))
1584 drms_uA_update(rdev);
1585
1586 rdev->use_count--;
1587 }
Mark Brown3801b862011-06-09 16:22:22 +01001588
Liam Girdwood414c70c2008-04-30 15:59:04 +01001589 return ret;
1590}
1591
1592/**
1593 * regulator_disable - disable regulator output
1594 * @regulator: regulator source
1595 *
Mark Browncf7bbcd2008-12-31 12:52:43 +00001596 * Disable the regulator output voltage or current. Calls to
1597 * regulator_enable() must be balanced with calls to
1598 * regulator_disable().
Mark Brown69279fb2008-12-31 12:52:41 +00001599 *
Liam Girdwood414c70c2008-04-30 15:59:04 +01001600 * NOTE: this will only disable the regulator output if no other consumer
Mark Browncf7bbcd2008-12-31 12:52:43 +00001601 * devices have it enabled, the regulator device supports disabling and
1602 * machine constraints permit this operation.
Liam Girdwood414c70c2008-04-30 15:59:04 +01001603 */
1604int regulator_disable(struct regulator *regulator)
1605{
David Brownell412aec62008-11-16 11:44:46 -08001606 struct regulator_dev *rdev = regulator->rdev;
1607 int ret = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001608
Mark Brown6492bc12012-04-19 13:19:07 +01001609 if (regulator->always_on)
1610 return 0;
1611
David Brownell412aec62008-11-16 11:44:46 -08001612 mutex_lock(&rdev->mutex);
Mark Brown3801b862011-06-09 16:22:22 +01001613 ret = _regulator_disable(rdev);
David Brownell412aec62008-11-16 11:44:46 -08001614 mutex_unlock(&rdev->mutex);
Jeffrey Carlyle8cbf8112010-10-08 14:49:19 -05001615
Mark Brown3801b862011-06-09 16:22:22 +01001616 if (ret == 0 && rdev->supply)
1617 regulator_disable(rdev->supply);
Jeffrey Carlyle8cbf8112010-10-08 14:49:19 -05001618
Liam Girdwood414c70c2008-04-30 15:59:04 +01001619 return ret;
1620}
1621EXPORT_SYMBOL_GPL(regulator_disable);
1622
1623/* locks held by regulator_force_disable() */
Mark Brown3801b862011-06-09 16:22:22 +01001624static int _regulator_force_disable(struct regulator_dev *rdev)
Liam Girdwood414c70c2008-04-30 15:59:04 +01001625{
1626 int ret = 0;
1627
1628 /* force disable */
1629 if (rdev->desc->ops->disable) {
1630 /* ah well, who wants to live forever... */
1631 ret = rdev->desc->ops->disable(rdev);
1632 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001633 rdev_err(rdev, "failed to force disable\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +01001634 return ret;
1635 }
1636 /* notify other consumers that power has been forced off */
Mark Brown84b68262009-12-01 21:12:27 +00001637 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1638 REGULATOR_EVENT_DISABLE, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001639 }
1640
Liam Girdwood414c70c2008-04-30 15:59:04 +01001641 return ret;
1642}
1643
1644/**
1645 * regulator_force_disable - force disable regulator output
1646 * @regulator: regulator source
1647 *
1648 * Forcibly disable the regulator output voltage or current.
1649 * NOTE: this *will* disable the regulator output even if other consumer
1650 * devices have it enabled. This should be used for situations when device
1651 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1652 */
1653int regulator_force_disable(struct regulator *regulator)
1654{
Mark Brown82d15832011-05-09 11:41:02 +02001655 struct regulator_dev *rdev = regulator->rdev;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001656 int ret;
1657
Mark Brown82d15832011-05-09 11:41:02 +02001658 mutex_lock(&rdev->mutex);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001659 regulator->uA_load = 0;
Mark Brown3801b862011-06-09 16:22:22 +01001660 ret = _regulator_force_disable(regulator->rdev);
Mark Brown82d15832011-05-09 11:41:02 +02001661 mutex_unlock(&rdev->mutex);
Jeffrey Carlyle8cbf8112010-10-08 14:49:19 -05001662
Mark Brown3801b862011-06-09 16:22:22 +01001663 if (rdev->supply)
1664 while (rdev->open_count--)
1665 regulator_disable(rdev->supply);
Jeffrey Carlyle8cbf8112010-10-08 14:49:19 -05001666
Liam Girdwood414c70c2008-04-30 15:59:04 +01001667 return ret;
1668}
1669EXPORT_SYMBOL_GPL(regulator_force_disable);
1670
Mark Brownda07ecd2011-09-11 09:53:50 +01001671static void regulator_disable_work(struct work_struct *work)
1672{
1673 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1674 disable_work.work);
1675 int count, i, ret;
1676
1677 mutex_lock(&rdev->mutex);
1678
1679 BUG_ON(!rdev->deferred_disables);
1680
1681 count = rdev->deferred_disables;
1682 rdev->deferred_disables = 0;
1683
1684 for (i = 0; i < count; i++) {
1685 ret = _regulator_disable(rdev);
1686 if (ret != 0)
1687 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1688 }
1689
1690 mutex_unlock(&rdev->mutex);
1691
1692 if (rdev->supply) {
1693 for (i = 0; i < count; i++) {
1694 ret = regulator_disable(rdev->supply);
1695 if (ret != 0) {
1696 rdev_err(rdev,
1697 "Supply disable failed: %d\n", ret);
1698 }
1699 }
1700 }
1701}
1702
1703/**
1704 * regulator_disable_deferred - disable regulator output with delay
1705 * @regulator: regulator source
1706 * @ms: miliseconds until the regulator is disabled
1707 *
1708 * Execute regulator_disable() on the regulator after a delay. This
1709 * is intended for use with devices that require some time to quiesce.
1710 *
1711 * NOTE: this will only disable the regulator output if no other consumer
1712 * devices have it enabled, the regulator device supports disabling and
1713 * machine constraints permit this operation.
1714 */
1715int regulator_disable_deferred(struct regulator *regulator, int ms)
1716{
1717 struct regulator_dev *rdev = regulator->rdev;
Mark Brownaa598022011-10-03 22:42:43 +01001718 int ret;
Mark Brownda07ecd2011-09-11 09:53:50 +01001719
Mark Brown6492bc12012-04-19 13:19:07 +01001720 if (regulator->always_on)
1721 return 0;
1722
Mark Brownda07ecd2011-09-11 09:53:50 +01001723 mutex_lock(&rdev->mutex);
1724 rdev->deferred_disables++;
1725 mutex_unlock(&rdev->mutex);
1726
Mark Brownaa598022011-10-03 22:42:43 +01001727 ret = schedule_delayed_work(&rdev->disable_work,
1728 msecs_to_jiffies(ms));
1729 if (ret < 0)
1730 return ret;
1731 else
1732 return 0;
Mark Brownda07ecd2011-09-11 09:53:50 +01001733}
1734EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1735
Mark Browncd6dffb2012-04-15 12:37:47 +01001736/**
1737 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1738 *
1739 * @rdev: regulator to operate on
1740 *
1741 * Regulators that use regmap for their register I/O can set the
1742 * enable_reg and enable_mask fields in their descriptor and then use
1743 * this as their is_enabled operation, saving some code.
1744 */
1745int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1746{
1747 unsigned int val;
1748 int ret;
1749
1750 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1751 if (ret != 0)
1752 return ret;
1753
1754 return (val & rdev->desc->enable_mask) != 0;
1755}
1756EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1757
1758/**
1759 * regulator_enable_regmap - standard enable() for regmap users
1760 *
1761 * @rdev: regulator to operate on
1762 *
1763 * Regulators that use regmap for their register I/O can set the
1764 * enable_reg and enable_mask fields in their descriptor and then use
1765 * this as their enable() operation, saving some code.
1766 */
1767int regulator_enable_regmap(struct regulator_dev *rdev)
1768{
1769 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1770 rdev->desc->enable_mask,
1771 rdev->desc->enable_mask);
1772}
1773EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1774
1775/**
1776 * regulator_disable_regmap - standard disable() for regmap users
1777 *
1778 * @rdev: regulator to operate on
1779 *
1780 * Regulators that use regmap for their register I/O can set the
1781 * enable_reg and enable_mask fields in their descriptor and then use
1782 * this as their disable() operation, saving some code.
1783 */
1784int regulator_disable_regmap(struct regulator_dev *rdev)
1785{
1786 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1787 rdev->desc->enable_mask, 0);
1788}
1789EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1790
Liam Girdwood414c70c2008-04-30 15:59:04 +01001791static int _regulator_is_enabled(struct regulator_dev *rdev)
1792{
Mark Brown65f73502012-06-27 14:14:38 +01001793 /* A GPIO control always takes precedence */
1794 if (rdev->ena_gpio)
1795 return rdev->ena_gpio_state;
1796
Mark Brown9a7f6a42010-02-11 17:22:45 +00001797 /* If we don't know then assume that the regulator is always on */
Mark Brown93325462009-08-03 18:49:56 +01001798 if (!rdev->desc->ops->is_enabled)
Mark Brown9a7f6a42010-02-11 17:22:45 +00001799 return 1;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001800
Mark Brown93325462009-08-03 18:49:56 +01001801 return rdev->desc->ops->is_enabled(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001802}
1803
1804/**
1805 * regulator_is_enabled - is the regulator output enabled
1806 * @regulator: regulator source
1807 *
David Brownell412aec62008-11-16 11:44:46 -08001808 * Returns positive if the regulator driver backing the source/client
1809 * has requested that the device be enabled, zero if it hasn't, else a
1810 * negative errno code.
1811 *
1812 * Note that the device backing this regulator handle can have multiple
1813 * users, so it might be enabled even if regulator_enable() was never
1814 * called for this particular source.
Liam Girdwood414c70c2008-04-30 15:59:04 +01001815 */
1816int regulator_is_enabled(struct regulator *regulator)
1817{
Mark Brown93325462009-08-03 18:49:56 +01001818 int ret;
1819
Mark Brown6492bc12012-04-19 13:19:07 +01001820 if (regulator->always_on)
1821 return 1;
1822
Mark Brown93325462009-08-03 18:49:56 +01001823 mutex_lock(&regulator->rdev->mutex);
1824 ret = _regulator_is_enabled(regulator->rdev);
1825 mutex_unlock(&regulator->rdev->mutex);
1826
1827 return ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001828}
1829EXPORT_SYMBOL_GPL(regulator_is_enabled);
1830
1831/**
David Brownell4367cfd2009-02-26 11:48:36 -08001832 * regulator_count_voltages - count regulator_list_voltage() selectors
1833 * @regulator: regulator source
1834 *
1835 * Returns number of selectors, or negative errno. Selectors are
1836 * numbered starting at zero, and typically correspond to bitfields
1837 * in hardware registers.
1838 */
1839int regulator_count_voltages(struct regulator *regulator)
1840{
1841 struct regulator_dev *rdev = regulator->rdev;
1842
1843 return rdev->desc->n_voltages ? : -EINVAL;
1844}
1845EXPORT_SYMBOL_GPL(regulator_count_voltages);
1846
1847/**
Mark Brownbca7bbf2012-05-09 21:38:33 +01001848 * regulator_list_voltage_linear - List voltages with simple calculation
1849 *
1850 * @rdev: Regulator device
1851 * @selector: Selector to convert into a voltage
1852 *
1853 * Regulators with a simple linear mapping between voltages and
1854 * selectors can set min_uV and uV_step in the regulator descriptor
1855 * and then use this function as their list_voltage() operation,
1856 */
1857int regulator_list_voltage_linear(struct regulator_dev *rdev,
1858 unsigned int selector)
1859{
1860 if (selector >= rdev->desc->n_voltages)
1861 return -EINVAL;
1862
1863 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
1864}
1865EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
1866
1867/**
Axel Lincffc9592012-05-20 10:30:21 +08001868 * regulator_list_voltage_table - List voltages with table based mapping
1869 *
1870 * @rdev: Regulator device
1871 * @selector: Selector to convert into a voltage
1872 *
1873 * Regulators with table based mapping between voltages and
1874 * selectors can set volt_table in the regulator descriptor
1875 * and then use this function as their list_voltage() operation.
1876 */
1877int regulator_list_voltage_table(struct regulator_dev *rdev,
1878 unsigned int selector)
1879{
1880 if (!rdev->desc->volt_table) {
1881 BUG_ON(!rdev->desc->volt_table);
1882 return -EINVAL;
1883 }
1884
1885 if (selector >= rdev->desc->n_voltages)
1886 return -EINVAL;
1887
1888 return rdev->desc->volt_table[selector];
1889}
1890EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
1891
1892/**
David Brownell4367cfd2009-02-26 11:48:36 -08001893 * regulator_list_voltage - enumerate supported voltages
1894 * @regulator: regulator source
1895 * @selector: identify voltage to list
1896 * Context: can sleep
1897 *
1898 * Returns a voltage that can be passed to @regulator_set_voltage(),
Thomas Weber88393162010-03-16 11:47:56 +01001899 * zero if this selector code can't be used on this system, or a
David Brownell4367cfd2009-02-26 11:48:36 -08001900 * negative errno.
1901 */
1902int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1903{
1904 struct regulator_dev *rdev = regulator->rdev;
1905 struct regulator_ops *ops = rdev->desc->ops;
1906 int ret;
1907
1908 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1909 return -EINVAL;
1910
1911 mutex_lock(&rdev->mutex);
1912 ret = ops->list_voltage(rdev, selector);
1913 mutex_unlock(&rdev->mutex);
1914
1915 if (ret > 0) {
1916 if (ret < rdev->constraints->min_uV)
1917 ret = 0;
1918 else if (ret > rdev->constraints->max_uV)
1919 ret = 0;
1920 }
1921
1922 return ret;
1923}
1924EXPORT_SYMBOL_GPL(regulator_list_voltage);
1925
1926/**
Mark Browna7a1ad92009-07-21 16:00:24 +01001927 * regulator_is_supported_voltage - check if a voltage range can be supported
1928 *
1929 * @regulator: Regulator to check.
1930 * @min_uV: Minimum required voltage in uV.
1931 * @max_uV: Maximum required voltage in uV.
1932 *
1933 * Returns a boolean or a negative error code.
1934 */
1935int regulator_is_supported_voltage(struct regulator *regulator,
1936 int min_uV, int max_uV)
1937{
Mark Brownc5f39392012-07-02 15:00:18 +01001938 struct regulator_dev *rdev = regulator->rdev;
Mark Browna7a1ad92009-07-21 16:00:24 +01001939 int i, voltages, ret;
1940
Mark Brownc5f39392012-07-02 15:00:18 +01001941 /* If we can't change voltage check the current voltage */
1942 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
1943 ret = regulator_get_voltage(regulator);
1944 if (ret >= 0)
1945 return (min_uV >= ret && ret <= max_uV);
1946 else
1947 return ret;
1948 }
1949
Mark Browna7a1ad92009-07-21 16:00:24 +01001950 ret = regulator_count_voltages(regulator);
1951 if (ret < 0)
1952 return ret;
1953 voltages = ret;
1954
1955 for (i = 0; i < voltages; i++) {
1956 ret = regulator_list_voltage(regulator, i);
1957
1958 if (ret >= min_uV && ret <= max_uV)
1959 return 1;
1960 }
1961
1962 return 0;
1963}
Mark Browna398eaa2011-12-28 12:48:45 +00001964EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
Mark Browna7a1ad92009-07-21 16:00:24 +01001965
Mark Brown4ab5b3d2012-04-15 11:23:30 +01001966/**
1967 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
1968 *
1969 * @rdev: regulator to operate on
1970 *
1971 * Regulators that use regmap for their register I/O can set the
1972 * vsel_reg and vsel_mask fields in their descriptor and then use this
1973 * as their get_voltage_vsel operation, saving some code.
1974 */
1975int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
1976{
1977 unsigned int val;
1978 int ret;
1979
1980 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
1981 if (ret != 0)
1982 return ret;
1983
1984 val &= rdev->desc->vsel_mask;
1985 val >>= ffs(rdev->desc->vsel_mask) - 1;
1986
1987 return val;
1988}
1989EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
1990
1991/**
1992 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
1993 *
1994 * @rdev: regulator to operate on
1995 * @sel: Selector to set
1996 *
1997 * Regulators that use regmap for their register I/O can set the
1998 * vsel_reg and vsel_mask fields in their descriptor and then use this
1999 * as their set_voltage_vsel operation, saving some code.
2000 */
2001int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
2002{
2003 sel <<= ffs(rdev->desc->vsel_mask) - 1;
2004
2005 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
2006 rdev->desc->vsel_mask, sel);
2007}
2008EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
2009
Mark Browne843fc42012-05-09 21:16:06 +01002010/**
2011 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2012 *
2013 * @rdev: Regulator to operate on
2014 * @min_uV: Lower bound for voltage
2015 * @max_uV: Upper bound for voltage
2016 *
2017 * Drivers implementing set_voltage_sel() and list_voltage() can use
2018 * this as their map_voltage() operation. It will find a suitable
2019 * voltage by calling list_voltage() until it gets something in bounds
2020 * for the requested voltages.
2021 */
2022int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2023 int min_uV, int max_uV)
2024{
2025 int best_val = INT_MAX;
2026 int selector = 0;
2027 int i, ret;
2028
2029 /* Find the smallest voltage that falls within the specified
2030 * range.
2031 */
2032 for (i = 0; i < rdev->desc->n_voltages; i++) {
2033 ret = rdev->desc->ops->list_voltage(rdev, i);
2034 if (ret < 0)
2035 continue;
2036
2037 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2038 best_val = ret;
2039 selector = i;
2040 }
2041 }
2042
2043 if (best_val != INT_MAX)
2044 return selector;
2045 else
2046 return -EINVAL;
2047}
2048EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2049
Mark Brownbca7bbf2012-05-09 21:38:33 +01002050/**
2051 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2052 *
2053 * @rdev: Regulator to operate on
2054 * @min_uV: Lower bound for voltage
2055 * @max_uV: Upper bound for voltage
2056 *
2057 * Drivers providing min_uV and uV_step in their regulator_desc can
2058 * use this as their map_voltage() operation.
2059 */
2060int regulator_map_voltage_linear(struct regulator_dev *rdev,
2061 int min_uV, int max_uV)
2062{
2063 int ret, voltage;
2064
Axel Lin5a6881e2012-06-07 10:05:14 +08002065 /* Allow uV_step to be 0 for fixed voltage */
2066 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
2067 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
2068 return 0;
2069 else
2070 return -EINVAL;
2071 }
2072
Mark Brownbca7bbf2012-05-09 21:38:33 +01002073 if (!rdev->desc->uV_step) {
2074 BUG_ON(!rdev->desc->uV_step);
2075 return -EINVAL;
2076 }
2077
Axel Lin0bdc81e2012-06-07 09:52:12 +08002078 if (min_uV < rdev->desc->min_uV)
2079 min_uV = rdev->desc->min_uV;
2080
Axel Linccfcb1c2012-05-14 10:33:37 +08002081 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
Mark Brownbca7bbf2012-05-09 21:38:33 +01002082 if (ret < 0)
2083 return ret;
2084
2085 /* Map back into a voltage to verify we're still in bounds */
2086 voltage = rdev->desc->ops->list_voltage(rdev, ret);
2087 if (voltage < min_uV || voltage > max_uV)
2088 return -EINVAL;
2089
2090 return ret;
2091}
2092EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2093
Mark Brown75790252010-12-12 14:25:50 +00002094static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2095 int min_uV, int max_uV)
2096{
2097 int ret;
Linus Walleij77af1b2642011-03-17 13:24:36 +01002098 int delay = 0;
Mark Browne113d792012-06-26 10:57:51 +01002099 int best_val = 0;
Mark Brown75790252010-12-12 14:25:50 +00002100 unsigned int selector;
Axel Lineba41a52012-04-04 10:32:10 +08002101 int old_selector = -1;
Mark Brown75790252010-12-12 14:25:50 +00002102
2103 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2104
Mark Brownbf5892a2011-05-08 22:13:37 +01002105 min_uV += rdev->constraints->uV_offset;
2106 max_uV += rdev->constraints->uV_offset;
2107
Axel Lineba41a52012-04-04 10:32:10 +08002108 /*
2109 * If we can't obtain the old selector there is not enough
2110 * info to call set_voltage_time_sel().
2111 */
Axel Lin8b7485e2012-05-21 09:37:52 +08002112 if (_regulator_is_enabled(rdev) &&
2113 rdev->desc->ops->set_voltage_time_sel &&
Axel Lineba41a52012-04-04 10:32:10 +08002114 rdev->desc->ops->get_voltage_sel) {
2115 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2116 if (old_selector < 0)
2117 return old_selector;
2118 }
2119
Mark Brown75790252010-12-12 14:25:50 +00002120 if (rdev->desc->ops->set_voltage) {
2121 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2122 &selector);
Mark Browne113d792012-06-26 10:57:51 +01002123
2124 if (ret >= 0) {
2125 if (rdev->desc->ops->list_voltage)
2126 best_val = rdev->desc->ops->list_voltage(rdev,
2127 selector);
2128 else
2129 best_val = _regulator_get_voltage(rdev);
2130 }
2131
Mark Browne8eef822010-12-12 14:36:17 +00002132 } else if (rdev->desc->ops->set_voltage_sel) {
Axel Lin9152c362012-06-04 09:41:38 +08002133 if (rdev->desc->ops->map_voltage) {
Mark Browne843fc42012-05-09 21:16:06 +01002134 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2135 max_uV);
Axel Lin9152c362012-06-04 09:41:38 +08002136 } else {
2137 if (rdev->desc->ops->list_voltage ==
2138 regulator_list_voltage_linear)
2139 ret = regulator_map_voltage_linear(rdev,
2140 min_uV, max_uV);
2141 else
2142 ret = regulator_map_voltage_iterate(rdev,
2143 min_uV, max_uV);
2144 }
Mark Browne8eef822010-12-12 14:36:17 +00002145
Mark Browne843fc42012-05-09 21:16:06 +01002146 if (ret >= 0) {
Mark Browne113d792012-06-26 10:57:51 +01002147 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2148 if (min_uV <= best_val && max_uV >= best_val) {
2149 selector = ret;
2150 ret = rdev->desc->ops->set_voltage_sel(rdev,
2151 ret);
2152 } else {
2153 ret = -EINVAL;
2154 }
Mark Browne8eef822010-12-12 14:36:17 +00002155 }
Mark Brown75790252010-12-12 14:25:50 +00002156 } else {
2157 ret = -EINVAL;
2158 }
2159
Axel Lineba41a52012-04-04 10:32:10 +08002160 /* Call set_voltage_time_sel if successfully obtained old_selector */
Mark Brown5aff3a82012-06-26 11:16:58 +01002161 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
Axel Lineba41a52012-04-04 10:32:10 +08002162 rdev->desc->ops->set_voltage_time_sel) {
2163
2164 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2165 old_selector, selector);
2166 if (delay < 0) {
2167 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2168 delay);
2169 delay = 0;
2170 }
Axel Lineba41a52012-04-04 10:32:10 +08002171
Philip Rakity8b96de32012-06-14 15:07:56 -07002172 /* Insert any necessary delays */
2173 if (delay >= 1000) {
2174 mdelay(delay / 1000);
2175 udelay(delay % 1000);
2176 } else if (delay) {
2177 udelay(delay);
2178 }
Linus Walleij77af1b2642011-03-17 13:24:36 +01002179 }
2180
Philip Rakity2f7baf82012-06-15 11:27:36 -07002181 if (ret == 0 && best_val >= 0)
Mark Brownded06a52010-12-16 13:59:10 +00002182 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
Philip Rakity2f7baf82012-06-15 11:27:36 -07002183 (void *)best_val);
Mark Brownded06a52010-12-16 13:59:10 +00002184
Axel Lineba41a52012-04-04 10:32:10 +08002185 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
Mark Brown75790252010-12-12 14:25:50 +00002186
2187 return ret;
2188}
2189
Mark Browna7a1ad92009-07-21 16:00:24 +01002190/**
Liam Girdwood414c70c2008-04-30 15:59:04 +01002191 * regulator_set_voltage - set regulator output voltage
2192 * @regulator: regulator source
2193 * @min_uV: Minimum required voltage in uV
2194 * @max_uV: Maximum acceptable voltage in uV
2195 *
2196 * Sets a voltage regulator to the desired output voltage. This can be set
2197 * during any regulator state. IOW, regulator can be disabled or enabled.
2198 *
2199 * If the regulator is enabled then the voltage will change to the new value
2200 * immediately otherwise if the regulator is disabled the regulator will
2201 * output at the new voltage when enabled.
2202 *
2203 * NOTE: If the regulator is shared between several devices then the lowest
2204 * request voltage that meets the system constraints will be used.
Mark Brown69279fb2008-12-31 12:52:41 +00002205 * Regulator system constraints must be set for this regulator before
Liam Girdwood414c70c2008-04-30 15:59:04 +01002206 * calling this function otherwise this call will fail.
2207 */
2208int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2209{
2210 struct regulator_dev *rdev = regulator->rdev;
Mark Brown95a3c232010-12-16 15:49:37 +00002211 int ret = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002212
2213 mutex_lock(&rdev->mutex);
2214
Mark Brown95a3c232010-12-16 15:49:37 +00002215 /* If we're setting the same range as last time the change
2216 * should be a noop (some cpufreq implementations use the same
2217 * voltage for multiple frequencies, for example).
2218 */
2219 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2220 goto out;
2221
Liam Girdwood414c70c2008-04-30 15:59:04 +01002222 /* sanity check */
Mark Browne8eef822010-12-12 14:36:17 +00002223 if (!rdev->desc->ops->set_voltage &&
2224 !rdev->desc->ops->set_voltage_sel) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01002225 ret = -EINVAL;
2226 goto out;
2227 }
2228
2229 /* constraints check */
2230 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2231 if (ret < 0)
2232 goto out;
2233 regulator->min_uV = min_uV;
2234 regulator->max_uV = max_uV;
Mark Brown3a93f2a2010-11-10 14:38:29 +00002235
Thomas Petazzoni05fda3b1a2010-12-03 11:31:07 +01002236 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2237 if (ret < 0)
2238 goto out;
2239
Mark Brown75790252010-12-12 14:25:50 +00002240 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
Mark Brown02fa3ec2010-11-10 14:38:30 +00002241
Liam Girdwood414c70c2008-04-30 15:59:04 +01002242out:
2243 mutex_unlock(&rdev->mutex);
2244 return ret;
2245}
2246EXPORT_SYMBOL_GPL(regulator_set_voltage);
2247
Mark Brown606a2562010-12-16 15:49:36 +00002248/**
Linus Walleij88cd222b2011-03-17 13:24:52 +01002249 * regulator_set_voltage_time - get raise/fall time
2250 * @regulator: regulator source
2251 * @old_uV: starting voltage in microvolts
2252 * @new_uV: target voltage in microvolts
2253 *
2254 * Provided with the starting and ending voltage, this function attempts to
2255 * calculate the time in microseconds required to rise or fall to this new
2256 * voltage.
2257 */
2258int regulator_set_voltage_time(struct regulator *regulator,
2259 int old_uV, int new_uV)
2260{
2261 struct regulator_dev *rdev = regulator->rdev;
2262 struct regulator_ops *ops = rdev->desc->ops;
2263 int old_sel = -1;
2264 int new_sel = -1;
2265 int voltage;
2266 int i;
2267
2268 /* Currently requires operations to do this */
2269 if (!ops->list_voltage || !ops->set_voltage_time_sel
2270 || !rdev->desc->n_voltages)
2271 return -EINVAL;
2272
2273 for (i = 0; i < rdev->desc->n_voltages; i++) {
2274 /* We only look for exact voltage matches here */
2275 voltage = regulator_list_voltage(regulator, i);
2276 if (voltage < 0)
2277 return -EINVAL;
2278 if (voltage == 0)
2279 continue;
2280 if (voltage == old_uV)
2281 old_sel = i;
2282 if (voltage == new_uV)
2283 new_sel = i;
2284 }
2285
2286 if (old_sel < 0 || new_sel < 0)
2287 return -EINVAL;
2288
2289 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2290}
2291EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2292
2293/**
Yadwinder Singh Brar98a175b2012-06-09 16:40:38 +05302294 *regulator_set_voltage_time_sel - get raise/fall time
2295 * @regulator: regulator source
2296 * @old_selector: selector for starting voltage
2297 * @new_selector: selector for target voltage
2298 *
2299 * Provided with the starting and target voltage selectors, this function
2300 * returns time in microseconds required to rise or fall to this new voltage
2301 *
Axel Linf11d08c2012-06-19 09:38:45 +08002302 * Drivers providing ramp_delay in regulation_constraints can use this as their
Axel Lin398715a2012-06-18 10:11:28 +08002303 * set_voltage_time_sel() operation.
Yadwinder Singh Brar98a175b2012-06-09 16:40:38 +05302304 */
2305int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2306 unsigned int old_selector,
2307 unsigned int new_selector)
2308{
Axel Lin398715a2012-06-18 10:11:28 +08002309 unsigned int ramp_delay = 0;
Axel Linf11d08c2012-06-19 09:38:45 +08002310 int old_volt, new_volt;
Axel Lin398715a2012-06-18 10:11:28 +08002311
2312 if (rdev->constraints->ramp_delay)
2313 ramp_delay = rdev->constraints->ramp_delay;
2314 else if (rdev->desc->ramp_delay)
2315 ramp_delay = rdev->desc->ramp_delay;
2316
2317 if (ramp_delay == 0) {
Yadwinder Singh Brar6f0b2c62012-06-11 17:41:08 +05302318 rdev_warn(rdev, "ramp_delay not set\n");
Axel Lin398715a2012-06-18 10:11:28 +08002319 return 0;
Yadwinder Singh Brar6f0b2c62012-06-11 17:41:08 +05302320 }
Axel Lin398715a2012-06-18 10:11:28 +08002321
Axel Linf11d08c2012-06-19 09:38:45 +08002322 /* sanity check */
2323 if (!rdev->desc->ops->list_voltage)
2324 return -EINVAL;
Axel Lin398715a2012-06-18 10:11:28 +08002325
Axel Linf11d08c2012-06-19 09:38:45 +08002326 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2327 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2328
2329 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
Yadwinder Singh Brar98a175b2012-06-09 16:40:38 +05302330}
Mark Brownb19dbf72012-06-23 11:34:20 +01002331EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
Yadwinder Singh Brar98a175b2012-06-09 16:40:38 +05302332
2333/**
Mark Brown606a2562010-12-16 15:49:36 +00002334 * regulator_sync_voltage - re-apply last regulator output voltage
2335 * @regulator: regulator source
2336 *
2337 * Re-apply the last configured voltage. This is intended to be used
2338 * where some external control source the consumer is cooperating with
2339 * has caused the configured voltage to change.
2340 */
2341int regulator_sync_voltage(struct regulator *regulator)
2342{
2343 struct regulator_dev *rdev = regulator->rdev;
2344 int ret, min_uV, max_uV;
2345
2346 mutex_lock(&rdev->mutex);
2347
2348 if (!rdev->desc->ops->set_voltage &&
2349 !rdev->desc->ops->set_voltage_sel) {
2350 ret = -EINVAL;
2351 goto out;
2352 }
2353
2354 /* This is only going to work if we've had a voltage configured. */
2355 if (!regulator->min_uV && !regulator->max_uV) {
2356 ret = -EINVAL;
2357 goto out;
2358 }
2359
2360 min_uV = regulator->min_uV;
2361 max_uV = regulator->max_uV;
2362
2363 /* This should be a paranoia check... */
2364 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2365 if (ret < 0)
2366 goto out;
2367
2368 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2369 if (ret < 0)
2370 goto out;
2371
2372 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2373
2374out:
2375 mutex_unlock(&rdev->mutex);
2376 return ret;
2377}
2378EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2379
Liam Girdwood414c70c2008-04-30 15:59:04 +01002380static int _regulator_get_voltage(struct regulator_dev *rdev)
2381{
Mark Brownbf5892a2011-05-08 22:13:37 +01002382 int sel, ret;
Mark Brown476c2d82010-12-10 17:28:07 +00002383
2384 if (rdev->desc->ops->get_voltage_sel) {
2385 sel = rdev->desc->ops->get_voltage_sel(rdev);
2386 if (sel < 0)
2387 return sel;
Mark Brownbf5892a2011-05-08 22:13:37 +01002388 ret = rdev->desc->ops->list_voltage(rdev, sel);
Axel Lincb220d12011-05-23 20:08:10 +08002389 } else if (rdev->desc->ops->get_voltage) {
Mark Brownbf5892a2011-05-08 22:13:37 +01002390 ret = rdev->desc->ops->get_voltage(rdev);
Axel Lincb220d12011-05-23 20:08:10 +08002391 } else {
Liam Girdwood414c70c2008-04-30 15:59:04 +01002392 return -EINVAL;
Axel Lincb220d12011-05-23 20:08:10 +08002393 }
Mark Brownbf5892a2011-05-08 22:13:37 +01002394
Axel Lincb220d12011-05-23 20:08:10 +08002395 if (ret < 0)
2396 return ret;
Mark Brownbf5892a2011-05-08 22:13:37 +01002397 return ret - rdev->constraints->uV_offset;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002398}
2399
2400/**
2401 * regulator_get_voltage - get regulator output voltage
2402 * @regulator: regulator source
2403 *
2404 * This returns the current regulator voltage in uV.
2405 *
2406 * NOTE: If the regulator is disabled it will return the voltage value. This
2407 * function should not be used to determine regulator state.
2408 */
2409int regulator_get_voltage(struct regulator *regulator)
2410{
2411 int ret;
2412
2413 mutex_lock(&regulator->rdev->mutex);
2414
2415 ret = _regulator_get_voltage(regulator->rdev);
2416
2417 mutex_unlock(&regulator->rdev->mutex);
2418
2419 return ret;
2420}
2421EXPORT_SYMBOL_GPL(regulator_get_voltage);
2422
2423/**
2424 * regulator_set_current_limit - set regulator output current limit
2425 * @regulator: regulator source
2426 * @min_uA: Minimuum supported current in uA
2427 * @max_uA: Maximum supported current in uA
2428 *
2429 * Sets current sink to the desired output current. This can be set during
2430 * any regulator state. IOW, regulator can be disabled or enabled.
2431 *
2432 * If the regulator is enabled then the current will change to the new value
2433 * immediately otherwise if the regulator is disabled the regulator will
2434 * output at the new current when enabled.
2435 *
2436 * NOTE: Regulator system constraints must be set for this regulator before
2437 * calling this function otherwise this call will fail.
2438 */
2439int regulator_set_current_limit(struct regulator *regulator,
2440 int min_uA, int max_uA)
2441{
2442 struct regulator_dev *rdev = regulator->rdev;
2443 int ret;
2444
2445 mutex_lock(&rdev->mutex);
2446
2447 /* sanity check */
2448 if (!rdev->desc->ops->set_current_limit) {
2449 ret = -EINVAL;
2450 goto out;
2451 }
2452
2453 /* constraints check */
2454 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2455 if (ret < 0)
2456 goto out;
2457
2458 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2459out:
2460 mutex_unlock(&rdev->mutex);
2461 return ret;
2462}
2463EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2464
2465static int _regulator_get_current_limit(struct regulator_dev *rdev)
2466{
2467 int ret;
2468
2469 mutex_lock(&rdev->mutex);
2470
2471 /* sanity check */
2472 if (!rdev->desc->ops->get_current_limit) {
2473 ret = -EINVAL;
2474 goto out;
2475 }
2476
2477 ret = rdev->desc->ops->get_current_limit(rdev);
2478out:
2479 mutex_unlock(&rdev->mutex);
2480 return ret;
2481}
2482
2483/**
2484 * regulator_get_current_limit - get regulator output current
2485 * @regulator: regulator source
2486 *
2487 * This returns the current supplied by the specified current sink in uA.
2488 *
2489 * NOTE: If the regulator is disabled it will return the current value. This
2490 * function should not be used to determine regulator state.
2491 */
2492int regulator_get_current_limit(struct regulator *regulator)
2493{
2494 return _regulator_get_current_limit(regulator->rdev);
2495}
2496EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2497
2498/**
2499 * regulator_set_mode - set regulator operating mode
2500 * @regulator: regulator source
2501 * @mode: operating mode - one of the REGULATOR_MODE constants
2502 *
2503 * Set regulator operating mode to increase regulator efficiency or improve
2504 * regulation performance.
2505 *
2506 * NOTE: Regulator system constraints must be set for this regulator before
2507 * calling this function otherwise this call will fail.
2508 */
2509int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2510{
2511 struct regulator_dev *rdev = regulator->rdev;
2512 int ret;
Sundar R Iyer500b4ac2010-05-17 21:24:48 +05302513 int regulator_curr_mode;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002514
2515 mutex_lock(&rdev->mutex);
2516
2517 /* sanity check */
2518 if (!rdev->desc->ops->set_mode) {
2519 ret = -EINVAL;
2520 goto out;
2521 }
2522
Sundar R Iyer500b4ac2010-05-17 21:24:48 +05302523 /* return if the same mode is requested */
2524 if (rdev->desc->ops->get_mode) {
2525 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2526 if (regulator_curr_mode == mode) {
2527 ret = 0;
2528 goto out;
2529 }
2530 }
2531
Liam Girdwood414c70c2008-04-30 15:59:04 +01002532 /* constraints check */
Axel Lin22c51b42011-04-01 18:25:25 +08002533 ret = regulator_mode_constrain(rdev, &mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002534 if (ret < 0)
2535 goto out;
2536
2537 ret = rdev->desc->ops->set_mode(rdev, mode);
2538out:
2539 mutex_unlock(&rdev->mutex);
2540 return ret;
2541}
2542EXPORT_SYMBOL_GPL(regulator_set_mode);
2543
2544static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2545{
2546 int ret;
2547
2548 mutex_lock(&rdev->mutex);
2549
2550 /* sanity check */
2551 if (!rdev->desc->ops->get_mode) {
2552 ret = -EINVAL;
2553 goto out;
2554 }
2555
2556 ret = rdev->desc->ops->get_mode(rdev);
2557out:
2558 mutex_unlock(&rdev->mutex);
2559 return ret;
2560}
2561
2562/**
2563 * regulator_get_mode - get regulator operating mode
2564 * @regulator: regulator source
2565 *
2566 * Get the current regulator operating mode.
2567 */
2568unsigned int regulator_get_mode(struct regulator *regulator)
2569{
2570 return _regulator_get_mode(regulator->rdev);
2571}
2572EXPORT_SYMBOL_GPL(regulator_get_mode);
2573
2574/**
2575 * regulator_set_optimum_mode - set regulator optimum operating mode
2576 * @regulator: regulator source
2577 * @uA_load: load current
2578 *
2579 * Notifies the regulator core of a new device load. This is then used by
2580 * DRMS (if enabled by constraints) to set the most efficient regulator
2581 * operating mode for the new regulator loading.
2582 *
2583 * Consumer devices notify their supply regulator of the maximum power
2584 * they will require (can be taken from device datasheet in the power
2585 * consumption tables) when they change operational status and hence power
2586 * state. Examples of operational state changes that can affect power
2587 * consumption are :-
2588 *
2589 * o Device is opened / closed.
2590 * o Device I/O is about to begin or has just finished.
2591 * o Device is idling in between work.
2592 *
2593 * This information is also exported via sysfs to userspace.
2594 *
2595 * DRMS will sum the total requested load on the regulator and change
2596 * to the most efficient operating mode if platform constraints allow.
2597 *
2598 * Returns the new regulator mode or error.
2599 */
2600int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2601{
2602 struct regulator_dev *rdev = regulator->rdev;
2603 struct regulator *consumer;
Stephen Boydd92d95b62012-07-02 19:21:06 -07002604 int ret, output_uV, input_uV = 0, total_uA_load = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002605 unsigned int mode;
2606
Stephen Boydd92d95b62012-07-02 19:21:06 -07002607 if (rdev->supply)
2608 input_uV = regulator_get_voltage(rdev->supply);
2609
Liam Girdwood414c70c2008-04-30 15:59:04 +01002610 mutex_lock(&rdev->mutex);
2611
Mark Browna4b41482011-05-14 11:19:45 -07002612 /*
2613 * first check to see if we can set modes at all, otherwise just
2614 * tell the consumer everything is OK.
2615 */
Liam Girdwood414c70c2008-04-30 15:59:04 +01002616 regulator->uA_load = uA_load;
2617 ret = regulator_check_drms(rdev);
Mark Browna4b41482011-05-14 11:19:45 -07002618 if (ret < 0) {
2619 ret = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002620 goto out;
Mark Browna4b41482011-05-14 11:19:45 -07002621 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01002622
Liam Girdwood414c70c2008-04-30 15:59:04 +01002623 if (!rdev->desc->ops->get_optimum_mode)
2624 goto out;
2625
Mark Browna4b41482011-05-14 11:19:45 -07002626 /*
2627 * we can actually do this so any errors are indicators of
2628 * potential real failure.
2629 */
2630 ret = -EINVAL;
2631
Axel Lin854ccba2012-04-16 18:44:23 +08002632 if (!rdev->desc->ops->set_mode)
2633 goto out;
2634
Liam Girdwood414c70c2008-04-30 15:59:04 +01002635 /* get output voltage */
Mark Brown1bf5a1f2010-12-10 17:28:06 +00002636 output_uV = _regulator_get_voltage(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002637 if (output_uV <= 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08002638 rdev_err(rdev, "invalid output voltage found\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +01002639 goto out;
2640 }
2641
Stephen Boydd92d95b62012-07-02 19:21:06 -07002642 /* No supply? Use constraint voltage */
Mark Brown1bf5a1f2010-12-10 17:28:06 +00002643 if (input_uV <= 0)
Liam Girdwood414c70c2008-04-30 15:59:04 +01002644 input_uV = rdev->constraints->input_uV;
2645 if (input_uV <= 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08002646 rdev_err(rdev, "invalid input voltage found\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +01002647 goto out;
2648 }
2649
2650 /* calc total requested load for this regulator */
2651 list_for_each_entry(consumer, &rdev->consumer_list, list)
Stefan Roesefa2984d2009-11-27 15:56:34 +01002652 total_uA_load += consumer->uA_load;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002653
2654 mode = rdev->desc->ops->get_optimum_mode(rdev,
2655 input_uV, output_uV,
2656 total_uA_load);
Mark Brown2c608232011-03-30 06:29:12 +09002657 ret = regulator_mode_constrain(rdev, &mode);
David Brownelle5735202008-11-16 11:46:56 -08002658 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08002659 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2660 total_uA_load, input_uV, output_uV);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002661 goto out;
2662 }
2663
2664 ret = rdev->desc->ops->set_mode(rdev, mode);
David Brownelle5735202008-11-16 11:46:56 -08002665 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08002666 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002667 goto out;
2668 }
2669 ret = mode;
2670out:
2671 mutex_unlock(&rdev->mutex);
2672 return ret;
2673}
2674EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2675
2676/**
2677 * regulator_register_notifier - register regulator event notifier
2678 * @regulator: regulator source
Mark Brown69279fb2008-12-31 12:52:41 +00002679 * @nb: notifier block
Liam Girdwood414c70c2008-04-30 15:59:04 +01002680 *
2681 * Register notifier block to receive regulator events.
2682 */
2683int regulator_register_notifier(struct regulator *regulator,
2684 struct notifier_block *nb)
2685{
2686 return blocking_notifier_chain_register(&regulator->rdev->notifier,
2687 nb);
2688}
2689EXPORT_SYMBOL_GPL(regulator_register_notifier);
2690
2691/**
2692 * regulator_unregister_notifier - unregister regulator event notifier
2693 * @regulator: regulator source
Mark Brown69279fb2008-12-31 12:52:41 +00002694 * @nb: notifier block
Liam Girdwood414c70c2008-04-30 15:59:04 +01002695 *
2696 * Unregister regulator event notifier block.
2697 */
2698int regulator_unregister_notifier(struct regulator *regulator,
2699 struct notifier_block *nb)
2700{
2701 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2702 nb);
2703}
2704EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2705
Jonathan Cameronb136fb42009-01-19 18:20:58 +00002706/* notify regulator consumers and downstream regulator consumers.
2707 * Note mutex must be held by caller.
2708 */
Liam Girdwood414c70c2008-04-30 15:59:04 +01002709static void _notifier_call_chain(struct regulator_dev *rdev,
2710 unsigned long event, void *data)
2711{
Liam Girdwood414c70c2008-04-30 15:59:04 +01002712 /* call rdev chain first */
Mark Brownd8493d22012-06-15 19:09:09 +01002713 blocking_notifier_call_chain(&rdev->notifier, event, data);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002714}
2715
2716/**
2717 * regulator_bulk_get - get multiple regulator consumers
2718 *
2719 * @dev: Device to supply
2720 * @num_consumers: Number of consumers to register
2721 * @consumers: Configuration of consumers; clients are stored here.
2722 *
2723 * @return 0 on success, an errno on failure.
2724 *
2725 * This helper function allows drivers to get several regulator
2726 * consumers in one operation. If any of the regulators cannot be
2727 * acquired then any regulators that were allocated will be freed
2728 * before returning to the caller.
2729 */
2730int regulator_bulk_get(struct device *dev, int num_consumers,
2731 struct regulator_bulk_data *consumers)
2732{
2733 int i;
2734 int ret;
2735
2736 for (i = 0; i < num_consumers; i++)
2737 consumers[i].consumer = NULL;
2738
2739 for (i = 0; i < num_consumers; i++) {
2740 consumers[i].consumer = regulator_get(dev,
2741 consumers[i].supply);
2742 if (IS_ERR(consumers[i].consumer)) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01002743 ret = PTR_ERR(consumers[i].consumer);
Mark Brown5b307622009-10-13 13:06:49 +01002744 dev_err(dev, "Failed to get supply '%s': %d\n",
2745 consumers[i].supply, ret);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002746 consumers[i].consumer = NULL;
2747 goto err;
2748 }
2749 }
2750
2751 return 0;
2752
2753err:
Axel Linb29c7692012-02-20 10:32:16 +08002754 while (--i >= 0)
Liam Girdwood414c70c2008-04-30 15:59:04 +01002755 regulator_put(consumers[i].consumer);
2756
2757 return ret;
2758}
2759EXPORT_SYMBOL_GPL(regulator_bulk_get);
2760
Mark Browne6e74032012-01-20 20:10:08 +00002761/**
2762 * devm_regulator_bulk_get - managed get multiple regulator consumers
2763 *
2764 * @dev: Device to supply
2765 * @num_consumers: Number of consumers to register
2766 * @consumers: Configuration of consumers; clients are stored here.
2767 *
2768 * @return 0 on success, an errno on failure.
2769 *
2770 * This helper function allows drivers to get several regulator
2771 * consumers in one operation with management, the regulators will
2772 * automatically be freed when the device is unbound. If any of the
2773 * regulators cannot be acquired then any regulators that were
2774 * allocated will be freed before returning to the caller.
2775 */
2776int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2777 struct regulator_bulk_data *consumers)
2778{
2779 int i;
2780 int ret;
2781
2782 for (i = 0; i < num_consumers; i++)
2783 consumers[i].consumer = NULL;
2784
2785 for (i = 0; i < num_consumers; i++) {
2786 consumers[i].consumer = devm_regulator_get(dev,
2787 consumers[i].supply);
2788 if (IS_ERR(consumers[i].consumer)) {
2789 ret = PTR_ERR(consumers[i].consumer);
2790 dev_err(dev, "Failed to get supply '%s': %d\n",
2791 consumers[i].supply, ret);
2792 consumers[i].consumer = NULL;
2793 goto err;
2794 }
2795 }
2796
2797 return 0;
2798
2799err:
2800 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2801 devm_regulator_put(consumers[i].consumer);
2802
2803 return ret;
2804}
2805EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2806
Mark Brownf21e0e82011-05-24 08:12:40 +08002807static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2808{
2809 struct regulator_bulk_data *bulk = data;
2810
2811 bulk->ret = regulator_enable(bulk->consumer);
2812}
2813
Liam Girdwood414c70c2008-04-30 15:59:04 +01002814/**
2815 * regulator_bulk_enable - enable multiple regulator consumers
2816 *
2817 * @num_consumers: Number of consumers
2818 * @consumers: Consumer data; clients are stored here.
2819 * @return 0 on success, an errno on failure
2820 *
2821 * This convenience API allows consumers to enable multiple regulator
2822 * clients in a single API call. If any consumers cannot be enabled
2823 * then any others that were enabled will be disabled again prior to
2824 * return.
2825 */
2826int regulator_bulk_enable(int num_consumers,
2827 struct regulator_bulk_data *consumers)
2828{
Dan Williams2955b472012-07-09 19:33:25 -07002829 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002830 int i;
Mark Brownf21e0e82011-05-24 08:12:40 +08002831 int ret = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002832
Mark Brown6492bc12012-04-19 13:19:07 +01002833 for (i = 0; i < num_consumers; i++) {
2834 if (consumers[i].consumer->always_on)
2835 consumers[i].ret = 0;
2836 else
2837 async_schedule_domain(regulator_bulk_enable_async,
2838 &consumers[i], &async_domain);
2839 }
Mark Brownf21e0e82011-05-24 08:12:40 +08002840
2841 async_synchronize_full_domain(&async_domain);
2842
2843 /* If any consumer failed we need to unwind any that succeeded */
Liam Girdwood414c70c2008-04-30 15:59:04 +01002844 for (i = 0; i < num_consumers; i++) {
Mark Brownf21e0e82011-05-24 08:12:40 +08002845 if (consumers[i].ret != 0) {
2846 ret = consumers[i].ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002847 goto err;
Mark Brownf21e0e82011-05-24 08:12:40 +08002848 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01002849 }
2850
2851 return 0;
2852
2853err:
Axel Linb29c7692012-02-20 10:32:16 +08002854 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2855 while (--i >= 0)
2856 regulator_disable(consumers[i].consumer);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002857
2858 return ret;
2859}
2860EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2861
2862/**
2863 * regulator_bulk_disable - disable multiple regulator consumers
2864 *
2865 * @num_consumers: Number of consumers
2866 * @consumers: Consumer data; clients are stored here.
2867 * @return 0 on success, an errno on failure
2868 *
2869 * This convenience API allows consumers to disable multiple regulator
Sylwester Nawrocki49e22632012-01-25 12:35:38 +01002870 * clients in a single API call. If any consumers cannot be disabled
2871 * then any others that were disabled will be enabled again prior to
Liam Girdwood414c70c2008-04-30 15:59:04 +01002872 * return.
2873 */
2874int regulator_bulk_disable(int num_consumers,
2875 struct regulator_bulk_data *consumers)
2876{
2877 int i;
Mark Brown01e86f42012-03-28 21:36:38 +01002878 int ret, r;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002879
Sylwester Nawrocki49e22632012-01-25 12:35:38 +01002880 for (i = num_consumers - 1; i >= 0; --i) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01002881 ret = regulator_disable(consumers[i].consumer);
2882 if (ret != 0)
2883 goto err;
2884 }
2885
2886 return 0;
2887
2888err:
Joe Perches5da84fd2010-11-30 05:53:48 -08002889 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
Mark Brown01e86f42012-03-28 21:36:38 +01002890 for (++i; i < num_consumers; ++i) {
2891 r = regulator_enable(consumers[i].consumer);
2892 if (r != 0)
2893 pr_err("Failed to reename %s: %d\n",
2894 consumers[i].supply, r);
2895 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01002896
2897 return ret;
2898}
2899EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2900
2901/**
Donggeun Kime1de2f42012-01-03 16:22:03 +09002902 * regulator_bulk_force_disable - force disable multiple regulator consumers
2903 *
2904 * @num_consumers: Number of consumers
2905 * @consumers: Consumer data; clients are stored here.
2906 * @return 0 on success, an errno on failure
2907 *
2908 * This convenience API allows consumers to forcibly disable multiple regulator
2909 * clients in a single API call.
2910 * NOTE: This should be used for situations when device damage will
2911 * likely occur if the regulators are not disabled (e.g. over temp).
2912 * Although regulator_force_disable function call for some consumers can
2913 * return error numbers, the function is called for all consumers.
2914 */
2915int regulator_bulk_force_disable(int num_consumers,
2916 struct regulator_bulk_data *consumers)
2917{
2918 int i;
2919 int ret;
2920
2921 for (i = 0; i < num_consumers; i++)
2922 consumers[i].ret =
2923 regulator_force_disable(consumers[i].consumer);
2924
2925 for (i = 0; i < num_consumers; i++) {
2926 if (consumers[i].ret != 0) {
2927 ret = consumers[i].ret;
2928 goto out;
2929 }
2930 }
2931
2932 return 0;
2933out:
2934 return ret;
2935}
2936EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
2937
2938/**
Liam Girdwood414c70c2008-04-30 15:59:04 +01002939 * regulator_bulk_free - free multiple regulator consumers
2940 *
2941 * @num_consumers: Number of consumers
2942 * @consumers: Consumer data; clients are stored here.
2943 *
2944 * This convenience API allows consumers to free multiple regulator
2945 * clients in a single API call.
2946 */
2947void regulator_bulk_free(int num_consumers,
2948 struct regulator_bulk_data *consumers)
2949{
2950 int i;
2951
2952 for (i = 0; i < num_consumers; i++) {
2953 regulator_put(consumers[i].consumer);
2954 consumers[i].consumer = NULL;
2955 }
2956}
2957EXPORT_SYMBOL_GPL(regulator_bulk_free);
2958
2959/**
2960 * regulator_notifier_call_chain - call regulator event notifier
Mark Brown69279fb2008-12-31 12:52:41 +00002961 * @rdev: regulator source
Liam Girdwood414c70c2008-04-30 15:59:04 +01002962 * @event: notifier block
Mark Brown69279fb2008-12-31 12:52:41 +00002963 * @data: callback-specific data.
Liam Girdwood414c70c2008-04-30 15:59:04 +01002964 *
2965 * Called by regulator drivers to notify clients a regulator event has
2966 * occurred. We also notify regulator clients downstream.
Jonathan Cameronb136fb42009-01-19 18:20:58 +00002967 * Note lock must be held by caller.
Liam Girdwood414c70c2008-04-30 15:59:04 +01002968 */
2969int regulator_notifier_call_chain(struct regulator_dev *rdev,
2970 unsigned long event, void *data)
2971{
2972 _notifier_call_chain(rdev, event, data);
2973 return NOTIFY_DONE;
2974
2975}
2976EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2977
Mark Brownbe721972009-08-04 20:09:52 +02002978/**
2979 * regulator_mode_to_status - convert a regulator mode into a status
2980 *
2981 * @mode: Mode to convert
2982 *
2983 * Convert a regulator mode into a status.
2984 */
2985int regulator_mode_to_status(unsigned int mode)
2986{
2987 switch (mode) {
2988 case REGULATOR_MODE_FAST:
2989 return REGULATOR_STATUS_FAST;
2990 case REGULATOR_MODE_NORMAL:
2991 return REGULATOR_STATUS_NORMAL;
2992 case REGULATOR_MODE_IDLE:
2993 return REGULATOR_STATUS_IDLE;
Krystian Garbaciak03ffcf32012-07-12 11:50:38 +01002994 case REGULATOR_MODE_STANDBY:
Mark Brownbe721972009-08-04 20:09:52 +02002995 return REGULATOR_STATUS_STANDBY;
2996 default:
Krystian Garbaciak1beaf762012-07-12 13:53:35 +01002997 return REGULATOR_STATUS_UNDEFINED;
Mark Brownbe721972009-08-04 20:09:52 +02002998 }
2999}
3000EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3001
David Brownell7ad68e22008-11-11 17:39:02 -08003002/*
3003 * To avoid cluttering sysfs (and memory) with useless state, only
3004 * create attributes that can be meaningfully displayed.
3005 */
3006static int add_regulator_attributes(struct regulator_dev *rdev)
3007{
3008 struct device *dev = &rdev->dev;
3009 struct regulator_ops *ops = rdev->desc->ops;
3010 int status = 0;
3011
3012 /* some attributes need specific methods to be displayed */
Mark Brown4c788992011-11-02 11:39:09 +00003013 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3014 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
David Brownell7ad68e22008-11-11 17:39:02 -08003015 status = device_create_file(dev, &dev_attr_microvolts);
3016 if (status < 0)
3017 return status;
3018 }
3019 if (ops->get_current_limit) {
3020 status = device_create_file(dev, &dev_attr_microamps);
3021 if (status < 0)
3022 return status;
3023 }
3024 if (ops->get_mode) {
3025 status = device_create_file(dev, &dev_attr_opmode);
3026 if (status < 0)
3027 return status;
3028 }
3029 if (ops->is_enabled) {
3030 status = device_create_file(dev, &dev_attr_state);
3031 if (status < 0)
3032 return status;
3033 }
David Brownell853116a2009-01-14 23:03:17 -08003034 if (ops->get_status) {
3035 status = device_create_file(dev, &dev_attr_status);
3036 if (status < 0)
3037 return status;
3038 }
David Brownell7ad68e22008-11-11 17:39:02 -08003039
3040 /* some attributes are type-specific */
3041 if (rdev->desc->type == REGULATOR_CURRENT) {
3042 status = device_create_file(dev, &dev_attr_requested_microamps);
3043 if (status < 0)
3044 return status;
3045 }
3046
3047 /* all the other attributes exist to support constraints;
3048 * don't show them if there are no constraints, or if the
3049 * relevant supporting methods are missing.
3050 */
3051 if (!rdev->constraints)
3052 return status;
3053
3054 /* constraints need specific supporting methods */
Mark Browne8eef822010-12-12 14:36:17 +00003055 if (ops->set_voltage || ops->set_voltage_sel) {
David Brownell7ad68e22008-11-11 17:39:02 -08003056 status = device_create_file(dev, &dev_attr_min_microvolts);
3057 if (status < 0)
3058 return status;
3059 status = device_create_file(dev, &dev_attr_max_microvolts);
3060 if (status < 0)
3061 return status;
3062 }
3063 if (ops->set_current_limit) {
3064 status = device_create_file(dev, &dev_attr_min_microamps);
3065 if (status < 0)
3066 return status;
3067 status = device_create_file(dev, &dev_attr_max_microamps);
3068 if (status < 0)
3069 return status;
3070 }
3071
David Brownell7ad68e22008-11-11 17:39:02 -08003072 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3073 if (status < 0)
3074 return status;
3075 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3076 if (status < 0)
3077 return status;
3078 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3079 if (status < 0)
3080 return status;
3081
3082 if (ops->set_suspend_voltage) {
3083 status = device_create_file(dev,
3084 &dev_attr_suspend_standby_microvolts);
3085 if (status < 0)
3086 return status;
3087 status = device_create_file(dev,
3088 &dev_attr_suspend_mem_microvolts);
3089 if (status < 0)
3090 return status;
3091 status = device_create_file(dev,
3092 &dev_attr_suspend_disk_microvolts);
3093 if (status < 0)
3094 return status;
3095 }
3096
3097 if (ops->set_suspend_mode) {
3098 status = device_create_file(dev,
3099 &dev_attr_suspend_standby_mode);
3100 if (status < 0)
3101 return status;
3102 status = device_create_file(dev,
3103 &dev_attr_suspend_mem_mode);
3104 if (status < 0)
3105 return status;
3106 status = device_create_file(dev,
3107 &dev_attr_suspend_disk_mode);
3108 if (status < 0)
3109 return status;
3110 }
3111
3112 return status;
3113}
3114
Mark Brown1130e5b2010-12-21 23:49:31 +00003115static void rdev_init_debugfs(struct regulator_dev *rdev)
3116{
Mark Brown1130e5b2010-12-21 23:49:31 +00003117 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
Stephen Boyd24751432012-02-20 22:50:42 -08003118 if (!rdev->debugfs) {
Mark Brown1130e5b2010-12-21 23:49:31 +00003119 rdev_warn(rdev, "Failed to create debugfs directory\n");
Mark Brown1130e5b2010-12-21 23:49:31 +00003120 return;
3121 }
3122
3123 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3124 &rdev->use_count);
3125 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3126 &rdev->open_count);
Mark Brown1130e5b2010-12-21 23:49:31 +00003127}
3128
Liam Girdwood414c70c2008-04-30 15:59:04 +01003129/**
3130 * regulator_register - register regulator
Mark Brown69279fb2008-12-31 12:52:41 +00003131 * @regulator_desc: regulator to register
Mark Brownc1727082012-04-04 00:50:22 +01003132 * @config: runtime configuration for regulator
Liam Girdwood414c70c2008-04-30 15:59:04 +01003133 *
3134 * Called by regulator drivers to register a regulator.
3135 * Returns 0 on success.
3136 */
Mark Brown65f26842012-04-03 20:46:53 +01003137struct regulator_dev *
3138regulator_register(const struct regulator_desc *regulator_desc,
Mark Brownc1727082012-04-04 00:50:22 +01003139 const struct regulator_config *config)
Liam Girdwood414c70c2008-04-30 15:59:04 +01003140{
Mark Brown9a8f5e02011-11-29 18:11:19 +00003141 const struct regulation_constraints *constraints = NULL;
Mark Brownc1727082012-04-04 00:50:22 +01003142 const struct regulator_init_data *init_data;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003143 static atomic_t regulator_no = ATOMIC_INIT(0);
3144 struct regulator_dev *rdev;
Mark Brown32c8fad2012-04-11 10:19:12 +01003145 struct device *dev;
Liam Girdwooda5766f12008-10-10 13:22:20 +01003146 int ret, i;
Rajendra Nayak69511a42011-11-18 16:47:20 +05303147 const char *supply = NULL;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003148
Mark Brownc1727082012-04-04 00:50:22 +01003149 if (regulator_desc == NULL || config == NULL)
Liam Girdwood414c70c2008-04-30 15:59:04 +01003150 return ERR_PTR(-EINVAL);
3151
Mark Brown32c8fad2012-04-11 10:19:12 +01003152 dev = config->dev;
Mark Browndcf70112012-05-08 18:09:12 +01003153 WARN_ON(!dev);
Mark Brown32c8fad2012-04-11 10:19:12 +01003154
Liam Girdwood414c70c2008-04-30 15:59:04 +01003155 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3156 return ERR_PTR(-EINVAL);
3157
Diego Lizierocd78dfc2009-04-14 03:04:47 +02003158 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3159 regulator_desc->type != REGULATOR_CURRENT)
Liam Girdwood414c70c2008-04-30 15:59:04 +01003160 return ERR_PTR(-EINVAL);
3161
Mark Brown476c2d82010-12-10 17:28:07 +00003162 /* Only one of each should be implemented */
3163 WARN_ON(regulator_desc->ops->get_voltage &&
3164 regulator_desc->ops->get_voltage_sel);
Mark Browne8eef822010-12-12 14:36:17 +00003165 WARN_ON(regulator_desc->ops->set_voltage &&
3166 regulator_desc->ops->set_voltage_sel);
Mark Brown476c2d82010-12-10 17:28:07 +00003167
3168 /* If we're using selectors we must implement list_voltage. */
3169 if (regulator_desc->ops->get_voltage_sel &&
3170 !regulator_desc->ops->list_voltage) {
3171 return ERR_PTR(-EINVAL);
3172 }
Mark Browne8eef822010-12-12 14:36:17 +00003173 if (regulator_desc->ops->set_voltage_sel &&
3174 !regulator_desc->ops->list_voltage) {
3175 return ERR_PTR(-EINVAL);
3176 }
Mark Brown476c2d82010-12-10 17:28:07 +00003177
Mark Brownc1727082012-04-04 00:50:22 +01003178 init_data = config->init_data;
3179
Liam Girdwood414c70c2008-04-30 15:59:04 +01003180 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3181 if (rdev == NULL)
3182 return ERR_PTR(-ENOMEM);
3183
3184 mutex_lock(&regulator_list_mutex);
3185
3186 mutex_init(&rdev->mutex);
Mark Brownc1727082012-04-04 00:50:22 +01003187 rdev->reg_data = config->driver_data;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003188 rdev->owner = regulator_desc->owner;
3189 rdev->desc = regulator_desc;
Mark Brown3a4b0a02012-05-08 18:10:45 +01003190 if (config->regmap)
3191 rdev->regmap = config->regmap;
3192 else
3193 rdev->regmap = dev_get_regmap(dev, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003194 INIT_LIST_HEAD(&rdev->consumer_list);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003195 INIT_LIST_HEAD(&rdev->list);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003196 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
Mark Brownda07ecd2011-09-11 09:53:50 +01003197 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003198
Liam Girdwooda5766f12008-10-10 13:22:20 +01003199 /* preform any regulator specific init */
Mark Brown9a8f5e02011-11-29 18:11:19 +00003200 if (init_data && init_data->regulator_init) {
Liam Girdwooda5766f12008-10-10 13:22:20 +01003201 ret = init_data->regulator_init(rdev->reg_data);
David Brownell4fca9542008-11-11 17:38:53 -08003202 if (ret < 0)
3203 goto clean;
Liam Girdwooda5766f12008-10-10 13:22:20 +01003204 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01003205
Liam Girdwooda5766f12008-10-10 13:22:20 +01003206 /* register with sysfs */
3207 rdev->dev.class = &regulator_class;
Mark Brownc1727082012-04-04 00:50:22 +01003208 rdev->dev.of_node = config->of_node;
Liam Girdwooda5766f12008-10-10 13:22:20 +01003209 rdev->dev.parent = dev;
Kay Sievers812460a2008-11-02 03:55:10 +01003210 dev_set_name(&rdev->dev, "regulator.%d",
3211 atomic_inc_return(&regulator_no) - 1);
Liam Girdwooda5766f12008-10-10 13:22:20 +01003212 ret = device_register(&rdev->dev);
Vasiliy Kulikovad7725c2010-09-19 16:55:01 +04003213 if (ret != 0) {
3214 put_device(&rdev->dev);
David Brownell4fca9542008-11-11 17:38:53 -08003215 goto clean;
Vasiliy Kulikovad7725c2010-09-19 16:55:01 +04003216 }
Liam Girdwooda5766f12008-10-10 13:22:20 +01003217
3218 dev_set_drvdata(&rdev->dev, rdev);
3219
Marek Szyprowskib2a1ef42012-08-09 16:33:00 +02003220 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
Mark Brown65f73502012-06-27 14:14:38 +01003221 ret = gpio_request_one(config->ena_gpio,
3222 GPIOF_DIR_OUT | config->ena_gpio_flags,
3223 rdev_get_name(rdev));
3224 if (ret != 0) {
3225 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3226 config->ena_gpio, ret);
3227 goto clean;
3228 }
3229
3230 rdev->ena_gpio = config->ena_gpio;
3231 rdev->ena_gpio_invert = config->ena_gpio_invert;
3232
3233 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3234 rdev->ena_gpio_state = 1;
3235
3236 if (rdev->ena_gpio_invert)
3237 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3238 }
3239
Mike Rapoport74f544c2008-11-25 14:53:53 +02003240 /* set regulator constraints */
Mark Brown9a8f5e02011-11-29 18:11:19 +00003241 if (init_data)
3242 constraints = &init_data->constraints;
3243
3244 ret = set_machine_constraints(rdev, constraints);
Mike Rapoport74f544c2008-11-25 14:53:53 +02003245 if (ret < 0)
3246 goto scrub;
3247
David Brownell7ad68e22008-11-11 17:39:02 -08003248 /* add attributes supported by this regulator */
3249 ret = add_regulator_attributes(rdev);
3250 if (ret < 0)
3251 goto scrub;
3252
Mark Brown9a8f5e02011-11-29 18:11:19 +00003253 if (init_data && init_data->supply_regulator)
Rajendra Nayak69511a42011-11-18 16:47:20 +05303254 supply = init_data->supply_regulator;
3255 else if (regulator_desc->supply_name)
3256 supply = regulator_desc->supply_name;
3257
3258 if (supply) {
Mark Brown0178f3e2010-04-26 15:18:14 +01003259 struct regulator_dev *r;
Mark Brown0178f3e2010-04-26 15:18:14 +01003260
Mark Brown6d191a52012-03-29 14:19:02 +01003261 r = regulator_dev_lookup(dev, supply, &ret);
Mark Brown0178f3e2010-04-26 15:18:14 +01003262
Rajendra Nayak69511a42011-11-18 16:47:20 +05303263 if (!r) {
3264 dev_err(dev, "Failed to find supply %s\n", supply);
Mark Brown04bf3012012-03-11 13:07:56 +00003265 ret = -EPROBE_DEFER;
Mark Brown0178f3e2010-04-26 15:18:14 +01003266 goto scrub;
3267 }
3268
3269 ret = set_supply(rdev, r);
3270 if (ret < 0)
3271 goto scrub;
Laxman Dewanganb2296bd2012-01-02 13:08:45 +05303272
3273 /* Enable supply if rail is enabled */
Mark Brownb1a86832012-05-14 00:40:14 +01003274 if (_regulator_is_enabled(rdev)) {
Laxman Dewanganb2296bd2012-01-02 13:08:45 +05303275 ret = regulator_enable(rdev->supply);
3276 if (ret < 0)
3277 goto scrub;
3278 }
Mark Brown0178f3e2010-04-26 15:18:14 +01003279 }
3280
Liam Girdwooda5766f12008-10-10 13:22:20 +01003281 /* add consumers devices */
Mark Brown9a8f5e02011-11-29 18:11:19 +00003282 if (init_data) {
3283 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3284 ret = set_consumer_device_supply(rdev,
Mark Brown9a8f5e02011-11-29 18:11:19 +00003285 init_data->consumer_supplies[i].dev_name,
Mark Brown23c2f042011-02-24 17:39:09 +00003286 init_data->consumer_supplies[i].supply);
Mark Brown9a8f5e02011-11-29 18:11:19 +00003287 if (ret < 0) {
3288 dev_err(dev, "Failed to set supply %s\n",
3289 init_data->consumer_supplies[i].supply);
3290 goto unset_supplies;
3291 }
Mark Brown23c2f042011-02-24 17:39:09 +00003292 }
Liam Girdwooda5766f12008-10-10 13:22:20 +01003293 }
3294
3295 list_add(&rdev->list, &regulator_list);
Mark Brown1130e5b2010-12-21 23:49:31 +00003296
3297 rdev_init_debugfs(rdev);
Liam Girdwooda5766f12008-10-10 13:22:20 +01003298out:
Liam Girdwood414c70c2008-04-30 15:59:04 +01003299 mutex_unlock(&regulator_list_mutex);
3300 return rdev;
David Brownell4fca9542008-11-11 17:38:53 -08003301
Jani Nikulad4033b52010-04-29 10:55:11 +03003302unset_supplies:
3303 unset_regulator_supplies(rdev);
3304
David Brownell4fca9542008-11-11 17:38:53 -08003305scrub:
Mark Browne81dba852012-05-13 18:35:56 +01003306 if (rdev->supply)
3307 regulator_put(rdev->supply);
Mark Brown65f73502012-06-27 14:14:38 +01003308 if (rdev->ena_gpio)
3309 gpio_free(rdev->ena_gpio);
Axel Lin1a6958e72011-07-15 10:50:43 +08003310 kfree(rdev->constraints);
David Brownell4fca9542008-11-11 17:38:53 -08003311 device_unregister(&rdev->dev);
Paul Walmsley53032da2009-04-25 05:28:36 -06003312 /* device core frees rdev */
3313 rdev = ERR_PTR(ret);
3314 goto out;
3315
David Brownell4fca9542008-11-11 17:38:53 -08003316clean:
3317 kfree(rdev);
3318 rdev = ERR_PTR(ret);
3319 goto out;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003320}
3321EXPORT_SYMBOL_GPL(regulator_register);
3322
3323/**
3324 * regulator_unregister - unregister regulator
Mark Brown69279fb2008-12-31 12:52:41 +00003325 * @rdev: regulator to unregister
Liam Girdwood414c70c2008-04-30 15:59:04 +01003326 *
3327 * Called by regulator drivers to unregister a regulator.
3328 */
3329void regulator_unregister(struct regulator_dev *rdev)
3330{
3331 if (rdev == NULL)
3332 return;
3333
Mark Browne032b372012-03-28 21:17:55 +01003334 if (rdev->supply)
3335 regulator_put(rdev->supply);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003336 mutex_lock(&regulator_list_mutex);
Mark Brown1130e5b2010-12-21 23:49:31 +00003337 debugfs_remove_recursive(rdev->debugfs);
Mark Brownda07ecd2011-09-11 09:53:50 +01003338 flush_work_sync(&rdev->disable_work.work);
Mark Brown6bf87d12009-07-21 16:00:25 +01003339 WARN_ON(rdev->open_count);
Mike Rapoport0f1d7472009-01-22 16:00:29 +02003340 unset_regulator_supplies(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003341 list_del(&rdev->list);
Mark Brownf8c12fe2010-11-29 15:55:17 +00003342 kfree(rdev->constraints);
Mark Brown65f73502012-06-27 14:14:38 +01003343 if (rdev->ena_gpio)
3344 gpio_free(rdev->ena_gpio);
Lothar Waßmann58fb5cf2011-11-28 15:38:37 +01003345 device_unregister(&rdev->dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003346 mutex_unlock(&regulator_list_mutex);
3347}
3348EXPORT_SYMBOL_GPL(regulator_unregister);
3349
3350/**
Mark Browncf7bbcd2008-12-31 12:52:43 +00003351 * regulator_suspend_prepare - prepare regulators for system wide suspend
Liam Girdwood414c70c2008-04-30 15:59:04 +01003352 * @state: system suspend state
3353 *
3354 * Configure each regulator with it's suspend operating parameters for state.
3355 * This will usually be called by machine suspend code prior to supending.
3356 */
3357int regulator_suspend_prepare(suspend_state_t state)
3358{
3359 struct regulator_dev *rdev;
3360 int ret = 0;
3361
3362 /* ON is handled by regulator active state */
3363 if (state == PM_SUSPEND_ON)
3364 return -EINVAL;
3365
3366 mutex_lock(&regulator_list_mutex);
3367 list_for_each_entry(rdev, &regulator_list, list) {
3368
3369 mutex_lock(&rdev->mutex);
3370 ret = suspend_prepare(rdev, state);
3371 mutex_unlock(&rdev->mutex);
3372
3373 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08003374 rdev_err(rdev, "failed to prepare\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +01003375 goto out;
3376 }
3377 }
3378out:
3379 mutex_unlock(&regulator_list_mutex);
3380 return ret;
3381}
3382EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3383
3384/**
MyungJoo Ham7a32b582011-03-11 10:13:59 +09003385 * regulator_suspend_finish - resume regulators from system wide suspend
3386 *
3387 * Turn on regulators that might be turned off by regulator_suspend_prepare
3388 * and that should be turned on according to the regulators properties.
3389 */
3390int regulator_suspend_finish(void)
3391{
3392 struct regulator_dev *rdev;
3393 int ret = 0, error;
3394
3395 mutex_lock(&regulator_list_mutex);
3396 list_for_each_entry(rdev, &regulator_list, list) {
3397 struct regulator_ops *ops = rdev->desc->ops;
3398
3399 mutex_lock(&rdev->mutex);
3400 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3401 ops->enable) {
3402 error = ops->enable(rdev);
3403 if (error)
3404 ret = error;
3405 } else {
3406 if (!has_full_constraints)
3407 goto unlock;
3408 if (!ops->disable)
3409 goto unlock;
Mark Brownb1a86832012-05-14 00:40:14 +01003410 if (!_regulator_is_enabled(rdev))
MyungJoo Ham7a32b582011-03-11 10:13:59 +09003411 goto unlock;
3412
3413 error = ops->disable(rdev);
3414 if (error)
3415 ret = error;
3416 }
3417unlock:
3418 mutex_unlock(&rdev->mutex);
3419 }
3420 mutex_unlock(&regulator_list_mutex);
3421 return ret;
3422}
3423EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3424
3425/**
Mark Brownca725562009-03-16 19:36:34 +00003426 * regulator_has_full_constraints - the system has fully specified constraints
3427 *
3428 * Calling this function will cause the regulator API to disable all
3429 * regulators which have a zero use count and don't have an always_on
3430 * constraint in a late_initcall.
3431 *
3432 * The intention is that this will become the default behaviour in a
3433 * future kernel release so users are encouraged to use this facility
3434 * now.
3435 */
3436void regulator_has_full_constraints(void)
3437{
3438 has_full_constraints = 1;
3439}
3440EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3441
3442/**
Mark Brown688fe992010-10-05 19:18:32 -07003443 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3444 *
3445 * Calling this function will cause the regulator API to provide a
3446 * dummy regulator to consumers if no physical regulator is found,
3447 * allowing most consumers to proceed as though a regulator were
3448 * configured. This allows systems such as those with software
3449 * controllable regulators for the CPU core only to be brought up more
3450 * readily.
3451 */
3452void regulator_use_dummy_regulator(void)
3453{
3454 board_wants_dummy_regulator = true;
3455}
3456EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3457
3458/**
Liam Girdwood414c70c2008-04-30 15:59:04 +01003459 * rdev_get_drvdata - get rdev regulator driver data
Mark Brown69279fb2008-12-31 12:52:41 +00003460 * @rdev: regulator
Liam Girdwood414c70c2008-04-30 15:59:04 +01003461 *
3462 * Get rdev regulator driver private data. This call can be used in the
3463 * regulator driver context.
3464 */
3465void *rdev_get_drvdata(struct regulator_dev *rdev)
3466{
3467 return rdev->reg_data;
3468}
3469EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3470
3471/**
3472 * regulator_get_drvdata - get regulator driver data
3473 * @regulator: regulator
3474 *
3475 * Get regulator driver private data. This call can be used in the consumer
3476 * driver context when non API regulator specific functions need to be called.
3477 */
3478void *regulator_get_drvdata(struct regulator *regulator)
3479{
3480 return regulator->rdev->reg_data;
3481}
3482EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3483
3484/**
3485 * regulator_set_drvdata - set regulator driver data
3486 * @regulator: regulator
3487 * @data: data
3488 */
3489void regulator_set_drvdata(struct regulator *regulator, void *data)
3490{
3491 regulator->rdev->reg_data = data;
3492}
3493EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3494
3495/**
3496 * regulator_get_id - get regulator ID
Mark Brown69279fb2008-12-31 12:52:41 +00003497 * @rdev: regulator
Liam Girdwood414c70c2008-04-30 15:59:04 +01003498 */
3499int rdev_get_id(struct regulator_dev *rdev)
3500{
3501 return rdev->desc->id;
3502}
3503EXPORT_SYMBOL_GPL(rdev_get_id);
3504
Liam Girdwooda5766f12008-10-10 13:22:20 +01003505struct device *rdev_get_dev(struct regulator_dev *rdev)
3506{
3507 return &rdev->dev;
3508}
3509EXPORT_SYMBOL_GPL(rdev_get_dev);
3510
3511void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3512{
3513 return reg_init_data->driver_data;
3514}
3515EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3516
Mark Brownba55a972011-08-23 17:39:10 +01003517#ifdef CONFIG_DEBUG_FS
3518static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3519 size_t count, loff_t *ppos)
3520{
3521 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3522 ssize_t len, ret = 0;
3523 struct regulator_map *map;
3524
3525 if (!buf)
3526 return -ENOMEM;
3527
3528 list_for_each_entry(map, &regulator_map_list, list) {
3529 len = snprintf(buf + ret, PAGE_SIZE - ret,
3530 "%s -> %s.%s\n",
3531 rdev_get_name(map->regulator), map->dev_name,
3532 map->supply);
3533 if (len >= 0)
3534 ret += len;
3535 if (ret > PAGE_SIZE) {
3536 ret = PAGE_SIZE;
3537 break;
3538 }
3539 }
3540
3541 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3542
3543 kfree(buf);
3544
3545 return ret;
3546}
Stephen Boyd24751432012-02-20 22:50:42 -08003547#endif
Mark Brownba55a972011-08-23 17:39:10 +01003548
3549static const struct file_operations supply_map_fops = {
Stephen Boyd24751432012-02-20 22:50:42 -08003550#ifdef CONFIG_DEBUG_FS
Mark Brownba55a972011-08-23 17:39:10 +01003551 .read = supply_map_read_file,
3552 .llseek = default_llseek,
Mark Brownba55a972011-08-23 17:39:10 +01003553#endif
Stephen Boyd24751432012-02-20 22:50:42 -08003554};
Mark Brownba55a972011-08-23 17:39:10 +01003555
Liam Girdwood414c70c2008-04-30 15:59:04 +01003556static int __init regulator_init(void)
3557{
Mark Brown34abbd62010-02-12 10:18:08 +00003558 int ret;
3559
Mark Brown34abbd62010-02-12 10:18:08 +00003560 ret = class_register(&regulator_class);
3561
Mark Brown1130e5b2010-12-21 23:49:31 +00003562 debugfs_root = debugfs_create_dir("regulator", NULL);
Stephen Boyd24751432012-02-20 22:50:42 -08003563 if (!debugfs_root)
Mark Brown1130e5b2010-12-21 23:49:31 +00003564 pr_warn("regulator: Failed to create debugfs directory\n");
Mark Brownba55a972011-08-23 17:39:10 +01003565
Mark Brownf4d562c2012-02-20 21:01:04 +00003566 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3567 &supply_map_fops);
Mark Brown1130e5b2010-12-21 23:49:31 +00003568
Mark Brown34abbd62010-02-12 10:18:08 +00003569 regulator_dummy_init();
3570
3571 return ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003572}
3573
3574/* init early to allow our consumers to complete system booting */
3575core_initcall(regulator_init);
Mark Brownca725562009-03-16 19:36:34 +00003576
3577static int __init regulator_init_complete(void)
3578{
3579 struct regulator_dev *rdev;
3580 struct regulator_ops *ops;
3581 struct regulation_constraints *c;
3582 int enabled, ret;
Mark Brownca725562009-03-16 19:36:34 +00003583
Mark Brown86f5fcf2012-07-06 18:19:13 +01003584 /*
3585 * Since DT doesn't provide an idiomatic mechanism for
3586 * enabling full constraints and since it's much more natural
3587 * with DT to provide them just assume that a DT enabled
3588 * system has full constraints.
3589 */
3590 if (of_have_populated_dt())
3591 has_full_constraints = true;
3592
Mark Brownca725562009-03-16 19:36:34 +00003593 mutex_lock(&regulator_list_mutex);
3594
3595 /* If we have a full configuration then disable any regulators
3596 * which are not in use or always_on. This will become the
3597 * default behaviour in the future.
3598 */
3599 list_for_each_entry(rdev, &regulator_list, list) {
3600 ops = rdev->desc->ops;
3601 c = rdev->constraints;
3602
Mark Brownf25e0b42009-08-03 18:49:55 +01003603 if (!ops->disable || (c && c->always_on))
Mark Brownca725562009-03-16 19:36:34 +00003604 continue;
3605
3606 mutex_lock(&rdev->mutex);
3607
3608 if (rdev->use_count)
3609 goto unlock;
3610
3611 /* If we can't read the status assume it's on. */
3612 if (ops->is_enabled)
3613 enabled = ops->is_enabled(rdev);
3614 else
3615 enabled = 1;
3616
3617 if (!enabled)
3618 goto unlock;
3619
3620 if (has_full_constraints) {
3621 /* We log since this may kill the system if it
3622 * goes wrong. */
Joe Perches5da84fd2010-11-30 05:53:48 -08003623 rdev_info(rdev, "disabling\n");
Mark Brownca725562009-03-16 19:36:34 +00003624 ret = ops->disable(rdev);
3625 if (ret != 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08003626 rdev_err(rdev, "couldn't disable: %d\n", ret);
Mark Brownca725562009-03-16 19:36:34 +00003627 }
3628 } else {
3629 /* The intention is that in future we will
3630 * assume that full constraints are provided
3631 * so warn even if we aren't going to do
3632 * anything here.
3633 */
Joe Perches5da84fd2010-11-30 05:53:48 -08003634 rdev_warn(rdev, "incomplete constraints, leaving on\n");
Mark Brownca725562009-03-16 19:36:34 +00003635 }
3636
3637unlock:
3638 mutex_unlock(&rdev->mutex);
3639 }
3640
3641 mutex_unlock(&regulator_list_mutex);
3642
3643 return 0;
3644}
3645late_initcall(regulator_init_complete);