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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>
Russell King778b28b2014-06-29 17:55:54 +010027#include <linux/gpio/consumer.h>
Rajendra Nayak69511a42011-11-18 16:47:20 +053028#include <linux/of.h>
Mark Brown65b19ce2012-04-15 11:16:05 +010029#include <linux/regmap.h>
Rajendra Nayak69511a42011-11-18 16:47:20 +053030#include <linux/regulator/of_regulator.h>
Liam Girdwood414c70c2008-04-30 15:59:04 +010031#include <linux/regulator/consumer.h>
32#include <linux/regulator/driver.h>
33#include <linux/regulator/machine.h>
Paul Gortmaker65602c32011-07-17 16:28:23 -040034#include <linux/module.h>
Liam Girdwood414c70c2008-04-30 15:59:04 +010035
Mark Brown02fa3ec2010-11-10 14:38:30 +000036#define CREATE_TRACE_POINTS
37#include <trace/events/regulator.h>
38
Mark Brown34abbd62010-02-12 10:18:08 +000039#include "dummy.h"
Mark Brown0cdfcc02013-09-11 13:15:40 +010040#include "internal.h"
Mark Brown34abbd62010-02-12 10:18:08 +000041
Mark Brown7d51a0d2011-06-09 16:06:37 +010042#define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
Joe Perches5da84fd2010-11-30 05:53:48 -080044#define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50#define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
52
Liam Girdwood414c70c2008-04-30 15:59:04 +010053static DEFINE_MUTEX(regulator_list_mutex);
Liam Girdwood414c70c2008-04-30 15:59:04 +010054static LIST_HEAD(regulator_map_list);
Kim, Milof19b00d2013-02-18 06:50:39 +000055static LIST_HEAD(regulator_ena_gpio_list);
Charles Keepaxa06ccd92013-10-15 20:14:20 +010056static LIST_HEAD(regulator_supply_alias_list);
Mark Brown21cf8912010-12-21 23:30:07 +000057static bool has_full_constraints;
Liam Girdwood414c70c2008-04-30 15:59:04 +010058
Mark Brown1130e5b2010-12-21 23:49:31 +000059static struct dentry *debugfs_root;
Mark Brown1130e5b2010-12-21 23:49:31 +000060
Tomeu Vizoso85f3b432015-09-21 16:02:47 +020061static struct class regulator_class;
62
Mark Brown8dc53902008-12-31 12:52:40 +000063/*
Liam Girdwood414c70c2008-04-30 15:59:04 +010064 * struct regulator_map
65 *
66 * Used to provide symbolic supply names to devices.
67 */
68struct regulator_map {
69 struct list_head list;
Mark Brown40f92442009-06-17 17:56:39 +010070 const char *dev_name; /* The dev_name() for the consumer */
Liam Girdwood414c70c2008-04-30 15:59:04 +010071 const char *supply;
Liam Girdwooda5766f12008-10-10 13:22:20 +010072 struct regulator_dev *regulator;
Liam Girdwood414c70c2008-04-30 15:59:04 +010073};
74
Liam Girdwood414c70c2008-04-30 15:59:04 +010075/*
Kim, Milof19b00d2013-02-18 06:50:39 +000076 * struct regulator_enable_gpio
77 *
78 * Management for shared enable GPIO pin
79 */
80struct regulator_enable_gpio {
81 struct list_head list;
Russell King778b28b2014-06-29 17:55:54 +010082 struct gpio_desc *gpiod;
Kim, Milof19b00d2013-02-18 06:50:39 +000083 u32 enable_count; /* a number of enabled shared GPIO */
84 u32 request_count; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert:1;
86};
87
Charles Keepaxa06ccd92013-10-15 20:14:20 +010088/*
89 * struct regulator_supply_alias
90 *
91 * Used to map lookups for a supply onto an alternative device.
92 */
93struct regulator_supply_alias {
94 struct list_head list;
95 struct device *src_dev;
96 const char *src_supply;
97 struct device *alias_dev;
98 const char *alias_supply;
99};
100
Liam Girdwood414c70c2008-04-30 15:59:04 +0100101static int _regulator_is_enabled(struct regulator_dev *rdev);
Mark Brown3801b862011-06-09 16:22:22 +0100102static int _regulator_disable(struct regulator_dev *rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100103static int _regulator_get_voltage(struct regulator_dev *rdev);
104static int _regulator_get_current_limit(struct regulator_dev *rdev);
105static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
Heiko Stübner71795692014-08-28 12:36:04 -0700106static int _notifier_call_chain(struct regulator_dev *rdev,
Liam Girdwood414c70c2008-04-30 15:59:04 +0100107 unsigned long event, void *data);
Mark Brown75790252010-12-12 14:25:50 +0000108static int _regulator_do_set_voltage(struct regulator_dev *rdev,
109 int min_uV, int max_uV);
Mark Brown3801b862011-06-09 16:22:22 +0100110static struct regulator *create_regulator(struct regulator_dev *rdev,
111 struct device *dev,
112 const char *supply_name);
Javier Martinez Canillas36a1f1b2015-07-15 16:10:29 +0200113static void _regulator_put(struct regulator *regulator);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100114
Mark Brown609ca5f2015-08-10 19:43:47 +0100115static struct regulator_dev *dev_to_rdev(struct device *dev)
116{
117 return container_of(dev, struct regulator_dev, dev);
118}
Liam Girdwood414c70c2008-04-30 15:59:04 +0100119
Mark Brown1083c392009-10-22 16:31:32 +0100120static const char *rdev_get_name(struct regulator_dev *rdev)
121{
122 if (rdev->constraints && rdev->constraints->name)
123 return rdev->constraints->name;
124 else if (rdev->desc->name)
125 return rdev->desc->name;
126 else
127 return "";
128}
129
Mark Brown87b28412013-11-27 16:13:10 +0000130static bool have_full_constraints(void)
131{
Mark Brown75bc9642013-11-27 16:22:53 +0000132 return has_full_constraints || of_have_populated_dt();
Mark Brown87b28412013-11-27 16:13:10 +0000133}
134
Thierry Reding70a7fb82015-12-02 16:54:50 +0100135static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev)
136{
137 if (rdev && rdev->supply)
138 return rdev->supply->rdev;
139
140 return NULL;
141}
142
Rajendra Nayak69511a42011-11-18 16:47:20 +0530143/**
Sascha Hauer9f01cd42015-09-30 16:05:42 +0200144 * regulator_lock_supply - lock a regulator and its supplies
145 * @rdev: regulator source
146 */
147static void regulator_lock_supply(struct regulator_dev *rdev)
148{
Arnd Bergmannfa731ac2015-11-20 15:24:39 +0100149 int i;
Sascha Hauer9f01cd42015-09-30 16:05:42 +0200150
Thierry Reding70a7fb82015-12-02 16:54:50 +0100151 for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++)
Arnd Bergmannfa731ac2015-11-20 15:24:39 +0100152 mutex_lock_nested(&rdev->mutex, i);
Sascha Hauer9f01cd42015-09-30 16:05:42 +0200153}
154
155/**
156 * regulator_unlock_supply - unlock a regulator and its supplies
157 * @rdev: regulator source
158 */
159static void regulator_unlock_supply(struct regulator_dev *rdev)
160{
161 struct regulator *supply;
162
163 while (1) {
164 mutex_unlock(&rdev->mutex);
165 supply = rdev->supply;
166
167 if (!rdev->supply)
168 return;
169
170 rdev = supply->rdev;
171 }
172}
173
174/**
Rajendra Nayak69511a42011-11-18 16:47:20 +0530175 * of_get_regulator - get a regulator device node based on supply name
176 * @dev: Device pointer for the consumer (of regulator) device
177 * @supply: regulator supply name
178 *
179 * Extract the regulator device node corresponding to the supply name.
Maxime Ripard167d41d2013-03-23 11:00:41 +0100180 * returns the device node corresponding to the regulator if found, else
Rajendra Nayak69511a42011-11-18 16:47:20 +0530181 * returns NULL.
182 */
183static struct device_node *of_get_regulator(struct device *dev, const char *supply)
184{
185 struct device_node *regnode = NULL;
186 char prop_name[32]; /* 32 is max size of property name */
187
188 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
189
190 snprintf(prop_name, 32, "%s-supply", supply);
191 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
192
193 if (!regnode) {
Rajendra Nayak16fbcc32012-03-16 15:50:21 +0530194 dev_dbg(dev, "Looking up %s property in node %s failed",
Rajendra Nayak69511a42011-11-18 16:47:20 +0530195 prop_name, dev->of_node->full_name);
196 return NULL;
197 }
198 return regnode;
199}
200
Mark Brown6492bc12012-04-19 13:19:07 +0100201static int _regulator_can_change_status(struct regulator_dev *rdev)
202{
203 if (!rdev->constraints)
204 return 0;
205
206 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
207 return 1;
208 else
209 return 0;
210}
211
Liam Girdwood414c70c2008-04-30 15:59:04 +0100212/* Platform voltage constraint check */
213static int regulator_check_voltage(struct regulator_dev *rdev,
214 int *min_uV, int *max_uV)
215{
216 BUG_ON(*min_uV > *max_uV);
217
218 if (!rdev->constraints) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800219 rdev_err(rdev, "no constraints\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100220 return -ENODEV;
221 }
222 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
Stephen Boyd7ebcf262015-09-16 12:10:26 -0700223 rdev_err(rdev, "voltage operation not allowed\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100224 return -EPERM;
225 }
226
227 if (*max_uV > rdev->constraints->max_uV)
228 *max_uV = rdev->constraints->max_uV;
229 if (*min_uV < rdev->constraints->min_uV)
230 *min_uV = rdev->constraints->min_uV;
231
Mark Brown89f425e2011-07-12 11:20:37 +0900232 if (*min_uV > *max_uV) {
233 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
Mark Brown54abd332011-07-21 15:07:37 +0100234 *min_uV, *max_uV);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100235 return -EINVAL;
Mark Brown89f425e2011-07-12 11:20:37 +0900236 }
Liam Girdwood414c70c2008-04-30 15:59:04 +0100237
238 return 0;
239}
240
Thomas Petazzoni05fda3b1a2010-12-03 11:31:07 +0100241/* Make sure we select a voltage that suits the needs of all
242 * regulator consumers
243 */
244static int regulator_check_consumers(struct regulator_dev *rdev,
245 int *min_uV, int *max_uV)
246{
247 struct regulator *regulator;
248
249 list_for_each_entry(regulator, &rdev->consumer_list, list) {
Mark Brown4aa922c2011-05-14 13:42:34 -0700250 /*
251 * Assume consumers that didn't say anything are OK
252 * with anything in the constraint range.
253 */
254 if (!regulator->min_uV && !regulator->max_uV)
255 continue;
256
Thomas Petazzoni05fda3b1a2010-12-03 11:31:07 +0100257 if (*max_uV > regulator->max_uV)
258 *max_uV = regulator->max_uV;
259 if (*min_uV < regulator->min_uV)
260 *min_uV = regulator->min_uV;
261 }
262
Mark Browndd8004a2012-11-28 17:09:27 +0000263 if (*min_uV > *max_uV) {
Russ Dill9c7b4e82013-02-14 04:46:33 -0800264 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
265 *min_uV, *max_uV);
Thomas Petazzoni05fda3b1a2010-12-03 11:31:07 +0100266 return -EINVAL;
Mark Browndd8004a2012-11-28 17:09:27 +0000267 }
Thomas Petazzoni05fda3b1a2010-12-03 11:31:07 +0100268
269 return 0;
270}
271
Liam Girdwood414c70c2008-04-30 15:59:04 +0100272/* current constraint check */
273static int regulator_check_current_limit(struct regulator_dev *rdev,
274 int *min_uA, int *max_uA)
275{
276 BUG_ON(*min_uA > *max_uA);
277
278 if (!rdev->constraints) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800279 rdev_err(rdev, "no constraints\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100280 return -ENODEV;
281 }
282 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
Stephen Boyd7ebcf262015-09-16 12:10:26 -0700283 rdev_err(rdev, "current operation not allowed\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100284 return -EPERM;
285 }
286
287 if (*max_uA > rdev->constraints->max_uA)
288 *max_uA = rdev->constraints->max_uA;
289 if (*min_uA < rdev->constraints->min_uA)
290 *min_uA = rdev->constraints->min_uA;
291
Mark Brown89f425e2011-07-12 11:20:37 +0900292 if (*min_uA > *max_uA) {
293 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
Mark Brown54abd332011-07-21 15:07:37 +0100294 *min_uA, *max_uA);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100295 return -EINVAL;
Mark Brown89f425e2011-07-12 11:20:37 +0900296 }
Liam Girdwood414c70c2008-04-30 15:59:04 +0100297
298 return 0;
299}
300
301/* operating mode constraint check */
Mark Brown2c608232011-03-30 06:29:12 +0900302static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100303{
Mark Brown2c608232011-03-30 06:29:12 +0900304 switch (*mode) {
David Brownelle5735202008-11-16 11:46:56 -0800305 case REGULATOR_MODE_FAST:
306 case REGULATOR_MODE_NORMAL:
307 case REGULATOR_MODE_IDLE:
308 case REGULATOR_MODE_STANDBY:
309 break;
310 default:
Mark Brown89f425e2011-07-12 11:20:37 +0900311 rdev_err(rdev, "invalid mode %x specified\n", *mode);
David Brownelle5735202008-11-16 11:46:56 -0800312 return -EINVAL;
313 }
314
Liam Girdwood414c70c2008-04-30 15:59:04 +0100315 if (!rdev->constraints) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800316 rdev_err(rdev, "no constraints\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100317 return -ENODEV;
318 }
319 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
Stephen Boyd7ebcf262015-09-16 12:10:26 -0700320 rdev_err(rdev, "mode operation not allowed\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100321 return -EPERM;
322 }
Mark Brown2c608232011-03-30 06:29:12 +0900323
324 /* The modes are bitmasks, the most power hungry modes having
325 * the lowest values. If the requested mode isn't supported
326 * try higher modes. */
327 while (*mode) {
328 if (rdev->constraints->valid_modes_mask & *mode)
329 return 0;
330 *mode /= 2;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100331 }
Mark Brown2c608232011-03-30 06:29:12 +0900332
333 return -EINVAL;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100334}
335
336/* dynamic regulator mode switching constraint check */
337static int regulator_check_drms(struct regulator_dev *rdev)
338{
339 if (!rdev->constraints) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800340 rdev_err(rdev, "no constraints\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100341 return -ENODEV;
342 }
343 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
Stephen Boyd7ebcf262015-09-16 12:10:26 -0700344 rdev_dbg(rdev, "drms operation not allowed\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100345 return -EPERM;
346 }
347 return 0;
348}
349
Liam Girdwood414c70c2008-04-30 15:59:04 +0100350static ssize_t regulator_uV_show(struct device *dev,
351 struct device_attribute *attr, char *buf)
352{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100353 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100354 ssize_t ret;
355
356 mutex_lock(&rdev->mutex);
357 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
358 mutex_unlock(&rdev->mutex);
359
360 return ret;
361}
David Brownell7ad68e22008-11-11 17:39:02 -0800362static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100363
364static ssize_t regulator_uA_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
366{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100367 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100368
369 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
370}
David Brownell7ad68e22008-11-11 17:39:02 -0800371static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100372
Greg Kroah-Hartman587cea22013-07-24 15:05:21 -0700373static ssize_t name_show(struct device *dev, struct device_attribute *attr,
374 char *buf)
Mark Brownbc558a62008-10-10 15:33:20 +0100375{
376 struct regulator_dev *rdev = dev_get_drvdata(dev);
Mark Brownbc558a62008-10-10 15:33:20 +0100377
Mark Brown1083c392009-10-22 16:31:32 +0100378 return sprintf(buf, "%s\n", rdev_get_name(rdev));
Mark Brownbc558a62008-10-10 15:33:20 +0100379}
Greg Kroah-Hartman587cea22013-07-24 15:05:21 -0700380static DEVICE_ATTR_RO(name);
Mark Brownbc558a62008-10-10 15:33:20 +0100381
David Brownell4fca9542008-11-11 17:38:53 -0800382static ssize_t regulator_print_opmode(char *buf, int mode)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100383{
Liam Girdwood414c70c2008-04-30 15:59:04 +0100384 switch (mode) {
385 case REGULATOR_MODE_FAST:
386 return sprintf(buf, "fast\n");
387 case REGULATOR_MODE_NORMAL:
388 return sprintf(buf, "normal\n");
389 case REGULATOR_MODE_IDLE:
390 return sprintf(buf, "idle\n");
391 case REGULATOR_MODE_STANDBY:
392 return sprintf(buf, "standby\n");
393 }
394 return sprintf(buf, "unknown\n");
395}
396
David Brownell4fca9542008-11-11 17:38:53 -0800397static ssize_t regulator_opmode_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100399{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100400 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100401
David Brownell4fca9542008-11-11 17:38:53 -0800402 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
403}
David Brownell7ad68e22008-11-11 17:39:02 -0800404static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
David Brownell4fca9542008-11-11 17:38:53 -0800405
406static ssize_t regulator_print_state(char *buf, int state)
407{
Liam Girdwood414c70c2008-04-30 15:59:04 +0100408 if (state > 0)
409 return sprintf(buf, "enabled\n");
410 else if (state == 0)
411 return sprintf(buf, "disabled\n");
412 else
413 return sprintf(buf, "unknown\n");
414}
415
David Brownell4fca9542008-11-11 17:38:53 -0800416static ssize_t regulator_state_show(struct device *dev,
417 struct device_attribute *attr, char *buf)
418{
419 struct regulator_dev *rdev = dev_get_drvdata(dev);
Mark Brown93325462009-08-03 18:49:56 +0100420 ssize_t ret;
David Brownell4fca9542008-11-11 17:38:53 -0800421
Mark Brown93325462009-08-03 18:49:56 +0100422 mutex_lock(&rdev->mutex);
423 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
424 mutex_unlock(&rdev->mutex);
425
426 return ret;
David Brownell4fca9542008-11-11 17:38:53 -0800427}
David Brownell7ad68e22008-11-11 17:39:02 -0800428static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
David Brownell4fca9542008-11-11 17:38:53 -0800429
David Brownell853116a2009-01-14 23:03:17 -0800430static ssize_t regulator_status_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
432{
433 struct regulator_dev *rdev = dev_get_drvdata(dev);
434 int status;
435 char *label;
436
437 status = rdev->desc->ops->get_status(rdev);
438 if (status < 0)
439 return status;
440
441 switch (status) {
442 case REGULATOR_STATUS_OFF:
443 label = "off";
444 break;
445 case REGULATOR_STATUS_ON:
446 label = "on";
447 break;
448 case REGULATOR_STATUS_ERROR:
449 label = "error";
450 break;
451 case REGULATOR_STATUS_FAST:
452 label = "fast";
453 break;
454 case REGULATOR_STATUS_NORMAL:
455 label = "normal";
456 break;
457 case REGULATOR_STATUS_IDLE:
458 label = "idle";
459 break;
460 case REGULATOR_STATUS_STANDBY:
461 label = "standby";
462 break;
Mark Brownf59c8f92012-08-31 10:36:37 -0700463 case REGULATOR_STATUS_BYPASS:
464 label = "bypass";
465 break;
Krystian Garbaciak1beaf762012-07-12 13:53:35 +0100466 case REGULATOR_STATUS_UNDEFINED:
467 label = "undefined";
468 break;
David Brownell853116a2009-01-14 23:03:17 -0800469 default:
470 return -ERANGE;
471 }
472
473 return sprintf(buf, "%s\n", label);
474}
475static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
476
Liam Girdwood414c70c2008-04-30 15:59:04 +0100477static ssize_t regulator_min_uA_show(struct device *dev,
478 struct device_attribute *attr, char *buf)
479{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100480 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100481
482 if (!rdev->constraints)
483 return sprintf(buf, "constraint not defined\n");
484
485 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
486}
David Brownell7ad68e22008-11-11 17:39:02 -0800487static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100488
489static ssize_t regulator_max_uA_show(struct device *dev,
490 struct device_attribute *attr, char *buf)
491{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100492 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100493
494 if (!rdev->constraints)
495 return sprintf(buf, "constraint not defined\n");
496
497 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
498}
David Brownell7ad68e22008-11-11 17:39:02 -0800499static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100500
501static ssize_t regulator_min_uV_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
503{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100504 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100505
506 if (!rdev->constraints)
507 return sprintf(buf, "constraint not defined\n");
508
509 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
510}
David Brownell7ad68e22008-11-11 17:39:02 -0800511static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100512
513static ssize_t regulator_max_uV_show(struct device *dev,
514 struct device_attribute *attr, char *buf)
515{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100516 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100517
518 if (!rdev->constraints)
519 return sprintf(buf, "constraint not defined\n");
520
521 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
522}
David Brownell7ad68e22008-11-11 17:39:02 -0800523static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100524
525static ssize_t regulator_total_uA_show(struct device *dev,
526 struct device_attribute *attr, char *buf)
527{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100528 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100529 struct regulator *regulator;
530 int uA = 0;
531
532 mutex_lock(&rdev->mutex);
533 list_for_each_entry(regulator, &rdev->consumer_list, list)
Stefan Roesefa2984d2009-11-27 15:56:34 +0100534 uA += regulator->uA_load;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100535 mutex_unlock(&rdev->mutex);
536 return sprintf(buf, "%d\n", uA);
537}
David Brownell7ad68e22008-11-11 17:39:02 -0800538static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100539
Greg Kroah-Hartman587cea22013-07-24 15:05:21 -0700540static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
541 char *buf)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100542{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100543 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100544 return sprintf(buf, "%d\n", rdev->use_count);
545}
Greg Kroah-Hartman587cea22013-07-24 15:05:21 -0700546static DEVICE_ATTR_RO(num_users);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100547
Greg Kroah-Hartman587cea22013-07-24 15:05:21 -0700548static ssize_t type_show(struct device *dev, struct device_attribute *attr,
549 char *buf)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100550{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100551 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100552
553 switch (rdev->desc->type) {
554 case REGULATOR_VOLTAGE:
555 return sprintf(buf, "voltage\n");
556 case REGULATOR_CURRENT:
557 return sprintf(buf, "current\n");
558 }
559 return sprintf(buf, "unknown\n");
560}
Greg Kroah-Hartman587cea22013-07-24 15:05:21 -0700561static DEVICE_ATTR_RO(type);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100562
563static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
564 struct device_attribute *attr, char *buf)
565{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100566 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100567
Liam Girdwood414c70c2008-04-30 15:59:04 +0100568 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
569}
David Brownell7ad68e22008-11-11 17:39:02 -0800570static DEVICE_ATTR(suspend_mem_microvolts, 0444,
571 regulator_suspend_mem_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100572
573static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
574 struct device_attribute *attr, char *buf)
575{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100576 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100577
Liam Girdwood414c70c2008-04-30 15:59:04 +0100578 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
579}
David Brownell7ad68e22008-11-11 17:39:02 -0800580static DEVICE_ATTR(suspend_disk_microvolts, 0444,
581 regulator_suspend_disk_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100582
583static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
584 struct device_attribute *attr, char *buf)
585{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100586 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100587
Liam Girdwood414c70c2008-04-30 15:59:04 +0100588 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
589}
David Brownell7ad68e22008-11-11 17:39:02 -0800590static DEVICE_ATTR(suspend_standby_microvolts, 0444,
591 regulator_suspend_standby_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100592
Liam Girdwood414c70c2008-04-30 15:59:04 +0100593static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
594 struct device_attribute *attr, char *buf)
595{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100596 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100597
David Brownell4fca9542008-11-11 17:38:53 -0800598 return regulator_print_opmode(buf,
599 rdev->constraints->state_mem.mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100600}
David Brownell7ad68e22008-11-11 17:39:02 -0800601static DEVICE_ATTR(suspend_mem_mode, 0444,
602 regulator_suspend_mem_mode_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100603
604static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
605 struct device_attribute *attr, char *buf)
606{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100607 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100608
David Brownell4fca9542008-11-11 17:38:53 -0800609 return regulator_print_opmode(buf,
610 rdev->constraints->state_disk.mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100611}
David Brownell7ad68e22008-11-11 17:39:02 -0800612static DEVICE_ATTR(suspend_disk_mode, 0444,
613 regulator_suspend_disk_mode_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100614
615static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
616 struct device_attribute *attr, char *buf)
617{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100618 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100619
David Brownell4fca9542008-11-11 17:38:53 -0800620 return regulator_print_opmode(buf,
621 rdev->constraints->state_standby.mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100622}
David Brownell7ad68e22008-11-11 17:39:02 -0800623static DEVICE_ATTR(suspend_standby_mode, 0444,
624 regulator_suspend_standby_mode_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100625
626static ssize_t regulator_suspend_mem_state_show(struct device *dev,
627 struct device_attribute *attr, char *buf)
628{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100629 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100630
David Brownell4fca9542008-11-11 17:38:53 -0800631 return regulator_print_state(buf,
632 rdev->constraints->state_mem.enabled);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100633}
David Brownell7ad68e22008-11-11 17:39:02 -0800634static DEVICE_ATTR(suspend_mem_state, 0444,
635 regulator_suspend_mem_state_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100636
637static ssize_t regulator_suspend_disk_state_show(struct device *dev,
638 struct device_attribute *attr, char *buf)
639{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100640 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100641
David Brownell4fca9542008-11-11 17:38:53 -0800642 return regulator_print_state(buf,
643 rdev->constraints->state_disk.enabled);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100644}
David Brownell7ad68e22008-11-11 17:39:02 -0800645static DEVICE_ATTR(suspend_disk_state, 0444,
646 regulator_suspend_disk_state_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100647
648static ssize_t regulator_suspend_standby_state_show(struct device *dev,
649 struct device_attribute *attr, char *buf)
650{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100651 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100652
David Brownell4fca9542008-11-11 17:38:53 -0800653 return regulator_print_state(buf,
654 rdev->constraints->state_standby.enabled);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100655}
David Brownell7ad68e22008-11-11 17:39:02 -0800656static DEVICE_ATTR(suspend_standby_state, 0444,
657 regulator_suspend_standby_state_show, NULL);
Mark Brownbc558a62008-10-10 15:33:20 +0100658
Mark Brownf59c8f92012-08-31 10:36:37 -0700659static ssize_t regulator_bypass_show(struct device *dev,
660 struct device_attribute *attr, char *buf)
661{
662 struct regulator_dev *rdev = dev_get_drvdata(dev);
663 const char *report;
664 bool bypass;
665 int ret;
666
667 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
668
669 if (ret != 0)
670 report = "unknown";
671 else if (bypass)
672 report = "enabled";
673 else
674 report = "disabled";
675
676 return sprintf(buf, "%s\n", report);
677}
678static DEVICE_ATTR(bypass, 0444,
679 regulator_bypass_show, NULL);
David Brownell7ad68e22008-11-11 17:39:02 -0800680
Liam Girdwood414c70c2008-04-30 15:59:04 +0100681/* Calculate the new optimum regulator operating mode based on the new total
682 * consumer load. All locks held by caller */
Bjorn Andersson8460ef32015-01-27 18:46:31 -0800683static int drms_uA_update(struct regulator_dev *rdev)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100684{
685 struct regulator *sibling;
686 int current_uA = 0, output_uV, input_uV, err;
687 unsigned int mode;
688
Krzysztof Kozlowski70cfef22015-06-29 09:04:43 +0900689 lockdep_assert_held_once(&rdev->mutex);
690
Bjorn Andersson8460ef32015-01-27 18:46:31 -0800691 /*
692 * first check to see if we can set modes at all, otherwise just
693 * tell the consumer everything is OK.
694 */
Liam Girdwood414c70c2008-04-30 15:59:04 +0100695 err = regulator_check_drms(rdev);
Bjorn Andersson8460ef32015-01-27 18:46:31 -0800696 if (err < 0)
697 return 0;
698
Bjorn Andersson8f4490e2015-02-11 19:39:12 -0800699 if (!rdev->desc->ops->get_optimum_mode &&
700 !rdev->desc->ops->set_load)
Bjorn Andersson8460ef32015-01-27 18:46:31 -0800701 return 0;
702
Bjorn Andersson8f4490e2015-02-11 19:39:12 -0800703 if (!rdev->desc->ops->set_mode &&
704 !rdev->desc->ops->set_load)
Bjorn Andersson8460ef32015-01-27 18:46:31 -0800705 return -EINVAL;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100706
707 /* get output voltage */
Mark Brown1bf5a1f2010-12-10 17:28:06 +0000708 output_uV = _regulator_get_voltage(rdev);
Bjorn Andersson8460ef32015-01-27 18:46:31 -0800709 if (output_uV <= 0) {
710 rdev_err(rdev, "invalid output voltage found\n");
711 return -EINVAL;
712 }
Liam Girdwood414c70c2008-04-30 15:59:04 +0100713
714 /* get input voltage */
Mark Brown1bf5a1f2010-12-10 17:28:06 +0000715 input_uV = 0;
716 if (rdev->supply)
Axel Lin3f24f5a2012-04-13 21:35:05 +0800717 input_uV = regulator_get_voltage(rdev->supply);
Mark Brown1bf5a1f2010-12-10 17:28:06 +0000718 if (input_uV <= 0)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100719 input_uV = rdev->constraints->input_uV;
Bjorn Andersson8460ef32015-01-27 18:46:31 -0800720 if (input_uV <= 0) {
721 rdev_err(rdev, "invalid input voltage found\n");
722 return -EINVAL;
723 }
Liam Girdwood414c70c2008-04-30 15:59:04 +0100724
725 /* calc total requested load */
726 list_for_each_entry(sibling, &rdev->consumer_list, list)
Stefan Roesefa2984d2009-11-27 15:56:34 +0100727 current_uA += sibling->uA_load;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100728
Stephen Boyd22a10bc2015-06-11 17:37:03 -0700729 current_uA += rdev->constraints->system_load;
730
Bjorn Andersson8f4490e2015-02-11 19:39:12 -0800731 if (rdev->desc->ops->set_load) {
732 /* set the optimum mode for our new total regulator load */
733 err = rdev->desc->ops->set_load(rdev, current_uA);
734 if (err < 0)
735 rdev_err(rdev, "failed to set load %d\n", current_uA);
736 } else {
737 /* now get the optimum mode for our new total regulator load */
738 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
739 output_uV, current_uA);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100740
Bjorn Andersson8f4490e2015-02-11 19:39:12 -0800741 /* check the new mode is allowed */
742 err = regulator_mode_constrain(rdev, &mode);
743 if (err < 0) {
744 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
745 current_uA, input_uV, output_uV);
746 return err;
747 }
748
749 err = rdev->desc->ops->set_mode(rdev, mode);
750 if (err < 0)
751 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
Bjorn Andersson8460ef32015-01-27 18:46:31 -0800752 }
753
Bjorn Andersson8460ef32015-01-27 18:46:31 -0800754 return err;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100755}
756
757static int suspend_set_state(struct regulator_dev *rdev,
758 struct regulator_state *rstate)
759{
760 int ret = 0;
Mark Brown638f85c2009-10-22 16:31:33 +0100761
762 /* If we have no suspend mode configration don't set anything;
Axel Lin8ac0e952012-04-14 09:14:34 +0800763 * only warn if the driver implements set_suspend_voltage or
764 * set_suspend_mode callback.
Mark Brown638f85c2009-10-22 16:31:33 +0100765 */
766 if (!rstate->enabled && !rstate->disabled) {
Axel Lin8ac0e952012-04-14 09:14:34 +0800767 if (rdev->desc->ops->set_suspend_voltage ||
768 rdev->desc->ops->set_suspend_mode)
Joe Perches5da84fd2010-11-30 05:53:48 -0800769 rdev_warn(rdev, "No configuration\n");
Mark Brown638f85c2009-10-22 16:31:33 +0100770 return 0;
771 }
772
773 if (rstate->enabled && rstate->disabled) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800774 rdev_err(rdev, "invalid configuration\n");
Mark Brown638f85c2009-10-22 16:31:33 +0100775 return -EINVAL;
776 }
777
Axel Lin8ac0e952012-04-14 09:14:34 +0800778 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100779 ret = rdev->desc->ops->set_suspend_enable(rdev);
Axel Lin8ac0e952012-04-14 09:14:34 +0800780 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100781 ret = rdev->desc->ops->set_suspend_disable(rdev);
Axel Lin8ac0e952012-04-14 09:14:34 +0800782 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
783 ret = 0;
784
Liam Girdwood414c70c2008-04-30 15:59:04 +0100785 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800786 rdev_err(rdev, "failed to enabled/disable\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100787 return ret;
788 }
789
790 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
791 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
792 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800793 rdev_err(rdev, "failed to set voltage\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100794 return ret;
795 }
796 }
797
798 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
799 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
800 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800801 rdev_err(rdev, "failed to set mode\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100802 return ret;
803 }
804 }
805 return ret;
806}
807
808/* locks held by caller */
809static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
810{
Krzysztof Kozlowski70cfef22015-06-29 09:04:43 +0900811 lockdep_assert_held_once(&rdev->mutex);
812
Liam Girdwood414c70c2008-04-30 15:59:04 +0100813 if (!rdev->constraints)
814 return -EINVAL;
815
816 switch (state) {
817 case PM_SUSPEND_STANDBY:
818 return suspend_set_state(rdev,
819 &rdev->constraints->state_standby);
820 case PM_SUSPEND_MEM:
821 return suspend_set_state(rdev,
822 &rdev->constraints->state_mem);
823 case PM_SUSPEND_MAX:
824 return suspend_set_state(rdev,
825 &rdev->constraints->state_disk);
826 default:
827 return -EINVAL;
828 }
829}
830
831static void print_constraints(struct regulator_dev *rdev)
832{
833 struct regulation_constraints *constraints = rdev->constraints;
Stefan Wahrena7068e32015-06-09 20:09:42 +0000834 char buf[160] = "";
Stefan Wahren5751a992015-06-10 06:13:15 +0000835 size_t len = sizeof(buf) - 1;
Mark Brown8f031b42009-10-22 16:31:31 +0100836 int count = 0;
837 int ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100838
Mark Brown8f031b42009-10-22 16:31:31 +0100839 if (constraints->min_uV && constraints->max_uV) {
Liam Girdwood414c70c2008-04-30 15:59:04 +0100840 if (constraints->min_uV == constraints->max_uV)
Stefan Wahren5751a992015-06-10 06:13:15 +0000841 count += scnprintf(buf + count, len - count, "%d mV ",
842 constraints->min_uV / 1000);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100843 else
Stefan Wahren5751a992015-06-10 06:13:15 +0000844 count += scnprintf(buf + count, len - count,
845 "%d <--> %d mV ",
846 constraints->min_uV / 1000,
847 constraints->max_uV / 1000);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100848 }
Mark Brown8f031b42009-10-22 16:31:31 +0100849
850 if (!constraints->min_uV ||
851 constraints->min_uV != constraints->max_uV) {
852 ret = _regulator_get_voltage(rdev);
853 if (ret > 0)
Stefan Wahren5751a992015-06-10 06:13:15 +0000854 count += scnprintf(buf + count, len - count,
855 "at %d mV ", ret / 1000);
Mark Brown8f031b42009-10-22 16:31:31 +0100856 }
857
Mark Brownbf5892a2011-05-08 22:13:37 +0100858 if (constraints->uV_offset)
Stefan Wahren5751a992015-06-10 06:13:15 +0000859 count += scnprintf(buf + count, len - count, "%dmV offset ",
860 constraints->uV_offset / 1000);
Mark Brownbf5892a2011-05-08 22:13:37 +0100861
Mark Brown8f031b42009-10-22 16:31:31 +0100862 if (constraints->min_uA && constraints->max_uA) {
863 if (constraints->min_uA == constraints->max_uA)
Stefan Wahren5751a992015-06-10 06:13:15 +0000864 count += scnprintf(buf + count, len - count, "%d mA ",
865 constraints->min_uA / 1000);
Mark Brown8f031b42009-10-22 16:31:31 +0100866 else
Stefan Wahren5751a992015-06-10 06:13:15 +0000867 count += scnprintf(buf + count, len - count,
868 "%d <--> %d mA ",
869 constraints->min_uA / 1000,
870 constraints->max_uA / 1000);
Mark Brown8f031b42009-10-22 16:31:31 +0100871 }
872
873 if (!constraints->min_uA ||
874 constraints->min_uA != constraints->max_uA) {
875 ret = _regulator_get_current_limit(rdev);
876 if (ret > 0)
Stefan Wahren5751a992015-06-10 06:13:15 +0000877 count += scnprintf(buf + count, len - count,
878 "at %d mA ", ret / 1000);
Mark Brown8f031b42009-10-22 16:31:31 +0100879 }
880
Liam Girdwood414c70c2008-04-30 15:59:04 +0100881 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
Stefan Wahren5751a992015-06-10 06:13:15 +0000882 count += scnprintf(buf + count, len - count, "fast ");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100883 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
Stefan Wahren5751a992015-06-10 06:13:15 +0000884 count += scnprintf(buf + count, len - count, "normal ");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100885 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
Stefan Wahren5751a992015-06-10 06:13:15 +0000886 count += scnprintf(buf + count, len - count, "idle ");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100887 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
Stefan Wahren5751a992015-06-10 06:13:15 +0000888 count += scnprintf(buf + count, len - count, "standby");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100889
Uwe Kleine-König215b8b02012-08-07 21:01:37 +0200890 if (!count)
Stefan Wahren5751a992015-06-10 06:13:15 +0000891 scnprintf(buf, len, "no parameters");
Uwe Kleine-König215b8b02012-08-07 21:01:37 +0200892
Mark Brown194dbae2014-10-31 19:11:59 +0000893 rdev_dbg(rdev, "%s\n", buf);
Mark Brown4a682922012-02-09 13:26:13 +0000894
895 if ((constraints->min_uV != constraints->max_uV) &&
896 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
897 rdev_warn(rdev,
898 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
Liam Girdwood414c70c2008-04-30 15:59:04 +0100899}
900
Mark Browne79055d2009-10-19 15:53:50 +0100901static int machine_constraints_voltage(struct regulator_dev *rdev,
Mark Brown1083c392009-10-22 16:31:32 +0100902 struct regulation_constraints *constraints)
Mark Browne79055d2009-10-19 15:53:50 +0100903{
Guodong Xu272e2312014-08-13 19:33:38 +0800904 const struct regulator_ops *ops = rdev->desc->ops;
Mark Brownaf5866c2009-10-22 16:31:30 +0100905 int ret;
906
907 /* do we need to apply the constraint voltage */
908 if (rdev->constraints->apply_uV &&
Mark Brown75790252010-12-12 14:25:50 +0000909 rdev->constraints->min_uV == rdev->constraints->max_uV) {
Alban Bedel064d5cd2014-05-20 12:12:16 +0200910 int current_uV = _regulator_get_voltage(rdev);
911 if (current_uV < 0) {
Nishanth Menon69d58832014-06-04 14:53:25 -0500912 rdev_err(rdev,
913 "failed to get the current voltage(%d)\n",
914 current_uV);
Alban Bedel064d5cd2014-05-20 12:12:16 +0200915 return current_uV;
916 }
917 if (current_uV < rdev->constraints->min_uV ||
918 current_uV > rdev->constraints->max_uV) {
919 ret = _regulator_do_set_voltage(
920 rdev, rdev->constraints->min_uV,
921 rdev->constraints->max_uV);
922 if (ret < 0) {
923 rdev_err(rdev,
Nishanth Menon69d58832014-06-04 14:53:25 -0500924 "failed to apply %duV constraint(%d)\n",
925 rdev->constraints->min_uV, ret);
Alban Bedel064d5cd2014-05-20 12:12:16 +0200926 return ret;
927 }
Mark Brown75790252010-12-12 14:25:50 +0000928 }
Mark Brownaf5866c2009-10-22 16:31:30 +0100929 }
Mark Browne79055d2009-10-19 15:53:50 +0100930
931 /* constrain machine-level voltage specs to fit
932 * the actual range supported by this regulator.
933 */
934 if (ops->list_voltage && rdev->desc->n_voltages) {
935 int count = rdev->desc->n_voltages;
936 int i;
937 int min_uV = INT_MAX;
938 int max_uV = INT_MIN;
939 int cmin = constraints->min_uV;
940 int cmax = constraints->max_uV;
941
942 /* it's safe to autoconfigure fixed-voltage supplies
943 and the constraints are used by list_voltage. */
944 if (count == 1 && !cmin) {
945 cmin = 1;
946 cmax = INT_MAX;
947 constraints->min_uV = cmin;
948 constraints->max_uV = cmax;
949 }
950
951 /* voltage constraints are optional */
952 if ((cmin == 0) && (cmax == 0))
953 return 0;
954
955 /* else require explicit machine-level constraints */
956 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800957 rdev_err(rdev, "invalid voltage constraints\n");
Mark Browne79055d2009-10-19 15:53:50 +0100958 return -EINVAL;
959 }
960
961 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
962 for (i = 0; i < count; i++) {
963 int value;
964
965 value = ops->list_voltage(rdev, i);
966 if (value <= 0)
967 continue;
968
969 /* maybe adjust [min_uV..max_uV] */
970 if (value >= cmin && value < min_uV)
971 min_uV = value;
972 if (value <= cmax && value > max_uV)
973 max_uV = value;
974 }
975
976 /* final: [min_uV..max_uV] valid iff constraints valid */
977 if (max_uV < min_uV) {
Mark Brownfff15be2012-11-27 18:48:56 +0000978 rdev_err(rdev,
979 "unsupportable voltage constraints %u-%uuV\n",
980 min_uV, max_uV);
Mark Browne79055d2009-10-19 15:53:50 +0100981 return -EINVAL;
982 }
983
984 /* use regulator's subset of machine constraints */
985 if (constraints->min_uV < min_uV) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800986 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
987 constraints->min_uV, min_uV);
Mark Browne79055d2009-10-19 15:53:50 +0100988 constraints->min_uV = min_uV;
989 }
990 if (constraints->max_uV > max_uV) {
Joe Perches5da84fd2010-11-30 05:53:48 -0800991 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
992 constraints->max_uV, max_uV);
Mark Browne79055d2009-10-19 15:53:50 +0100993 constraints->max_uV = max_uV;
994 }
995 }
996
997 return 0;
998}
999
Laxman Dewanganf8c17002013-09-20 13:13:02 +05301000static int machine_constraints_current(struct regulator_dev *rdev,
1001 struct regulation_constraints *constraints)
1002{
Guodong Xu272e2312014-08-13 19:33:38 +08001003 const struct regulator_ops *ops = rdev->desc->ops;
Laxman Dewanganf8c17002013-09-20 13:13:02 +05301004 int ret;
1005
1006 if (!constraints->min_uA && !constraints->max_uA)
1007 return 0;
1008
1009 if (constraints->min_uA > constraints->max_uA) {
1010 rdev_err(rdev, "Invalid current constraints\n");
1011 return -EINVAL;
1012 }
1013
1014 if (!ops->set_current_limit || !ops->get_current_limit) {
1015 rdev_warn(rdev, "Operation of current configuration missing\n");
1016 return 0;
1017 }
1018
1019 /* Set regulator current in constraints range */
1020 ret = ops->set_current_limit(rdev, constraints->min_uA,
1021 constraints->max_uA);
1022 if (ret < 0) {
1023 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1024 return ret;
1025 }
1026
1027 return 0;
1028}
1029
Markus Pargmann30c21972014-02-20 17:36:03 +01001030static int _regulator_do_enable(struct regulator_dev *rdev);
1031
Liam Girdwooda5766f12008-10-10 13:22:20 +01001032/**
1033 * set_machine_constraints - sets regulator constraints
Mark Brown69279fb2008-12-31 12:52:41 +00001034 * @rdev: regulator source
Mark Brownc8e7e462008-12-31 12:52:42 +00001035 * @constraints: constraints to apply
Liam Girdwooda5766f12008-10-10 13:22:20 +01001036 *
1037 * Allows platform initialisation code to define and constrain
1038 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1039 * Constraints *must* be set by platform code in order for some
1040 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1041 * set_mode.
1042 */
1043static int set_machine_constraints(struct regulator_dev *rdev,
Mark Brownf8c12fe2010-11-29 15:55:17 +00001044 const struct regulation_constraints *constraints)
Liam Girdwooda5766f12008-10-10 13:22:20 +01001045{
1046 int ret = 0;
Guodong Xu272e2312014-08-13 19:33:38 +08001047 const struct regulator_ops *ops = rdev->desc->ops;
Mark Browne06f5b42008-09-09 16:21:19 +01001048
Mark Brown9a8f5e02011-11-29 18:11:19 +00001049 if (constraints)
1050 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1051 GFP_KERNEL);
1052 else
1053 rdev->constraints = kzalloc(sizeof(*constraints),
1054 GFP_KERNEL);
Mark Brownf8c12fe2010-11-29 15:55:17 +00001055 if (!rdev->constraints)
1056 return -ENOMEM;
Mark Brownaf5866c2009-10-22 16:31:30 +01001057
Mark Brownf8c12fe2010-11-29 15:55:17 +00001058 ret = machine_constraints_voltage(rdev, rdev->constraints);
Mark Browne79055d2009-10-19 15:53:50 +01001059 if (ret != 0)
1060 goto out;
David Brownell4367cfd2009-02-26 11:48:36 -08001061
Laxman Dewanganf8c17002013-09-20 13:13:02 +05301062 ret = machine_constraints_current(rdev, rdev->constraints);
1063 if (ret != 0)
1064 goto out;
1065
Stephen Boyd36e4f832015-06-11 17:37:06 -07001066 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1067 ret = ops->set_input_current_limit(rdev,
1068 rdev->constraints->ilim_uA);
1069 if (ret < 0) {
1070 rdev_err(rdev, "failed to set input limit\n");
1071 goto out;
1072 }
1073 }
1074
Liam Girdwooda5766f12008-10-10 13:22:20 +01001075 /* do we need to setup our suspend state */
Mark Brown9a8f5e02011-11-29 18:11:19 +00001076 if (rdev->constraints->initial_state) {
Mark Brownf8c12fe2010-11-29 15:55:17 +00001077 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
Mark Browne06f5b42008-09-09 16:21:19 +01001078 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001079 rdev_err(rdev, "failed to set suspend state\n");
Mark Browne06f5b42008-09-09 16:21:19 +01001080 goto out;
1081 }
1082 }
Liam Girdwooda5766f12008-10-10 13:22:20 +01001083
Mark Brown9a8f5e02011-11-29 18:11:19 +00001084 if (rdev->constraints->initial_mode) {
Mark Browna3084662009-02-26 19:24:19 +00001085 if (!ops->set_mode) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001086 rdev_err(rdev, "no set_mode operation\n");
Mark Browna3084662009-02-26 19:24:19 +00001087 ret = -EINVAL;
1088 goto out;
1089 }
1090
Mark Brownf8c12fe2010-11-29 15:55:17 +00001091 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
Mark Browna3084662009-02-26 19:24:19 +00001092 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001093 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
Mark Browna3084662009-02-26 19:24:19 +00001094 goto out;
1095 }
1096 }
1097
Mark Browncacf90f2009-03-02 16:32:46 +00001098 /* If the constraints say the regulator should be on at this point
1099 * and we have control then make sure it is enabled.
1100 */
Markus Pargmann30c21972014-02-20 17:36:03 +01001101 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1102 ret = _regulator_do_enable(rdev);
1103 if (ret < 0 && ret != -EINVAL) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001104 rdev_err(rdev, "failed to enable\n");
Mark Browne5fda262008-09-09 16:21:20 +01001105 goto out;
1106 }
1107 }
1108
Yadwinder Singh Brar1653ccf2013-06-29 18:21:15 +05301109 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1110 && ops->set_ramp_delay) {
Yadwinder Singh Brar6f0b2c62012-06-11 17:41:08 +05301111 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1112 if (ret < 0) {
1113 rdev_err(rdev, "failed to set ramp_delay\n");
1114 goto out;
1115 }
1116 }
1117
Stephen Boyd23c779b2015-06-11 17:37:04 -07001118 if (rdev->constraints->pull_down && ops->set_pull_down) {
1119 ret = ops->set_pull_down(rdev);
1120 if (ret < 0) {
1121 rdev_err(rdev, "failed to set pull down\n");
1122 goto out;
1123 }
1124 }
1125
Stephen Boyd57f66b72015-06-11 17:37:05 -07001126 if (rdev->constraints->soft_start && ops->set_soft_start) {
1127 ret = ops->set_soft_start(rdev);
1128 if (ret < 0) {
1129 rdev_err(rdev, "failed to set soft start\n");
1130 goto out;
1131 }
1132 }
1133
Stephen Boyd3a003ba2015-07-17 14:41:54 -07001134 if (rdev->constraints->over_current_protection
1135 && ops->set_over_current_protection) {
1136 ret = ops->set_over_current_protection(rdev);
1137 if (ret < 0) {
1138 rdev_err(rdev, "failed to set over current protection\n");
1139 goto out;
1140 }
1141 }
1142
Liam Girdwooda5766f12008-10-10 13:22:20 +01001143 print_constraints(rdev);
Axel Lin1a6958e72011-07-15 10:50:43 +08001144 return 0;
Liam Girdwooda5766f12008-10-10 13:22:20 +01001145out:
Axel Lin1a6958e72011-07-15 10:50:43 +08001146 kfree(rdev->constraints);
1147 rdev->constraints = NULL;
Liam Girdwooda5766f12008-10-10 13:22:20 +01001148 return ret;
1149}
1150
1151/**
1152 * set_supply - set regulator supply regulator
Mark Brown69279fb2008-12-31 12:52:41 +00001153 * @rdev: regulator name
1154 * @supply_rdev: supply regulator name
Liam Girdwooda5766f12008-10-10 13:22:20 +01001155 *
1156 * Called by platform initialisation code to set the supply regulator for this
1157 * regulator. This ensures that a regulators supply will also be enabled by the
1158 * core if it's child is enabled.
1159 */
1160static int set_supply(struct regulator_dev *rdev,
Mark Brown3801b862011-06-09 16:22:22 +01001161 struct regulator_dev *supply_rdev)
Liam Girdwooda5766f12008-10-10 13:22:20 +01001162{
1163 int err;
1164
Mark Brown3801b862011-06-09 16:22:22 +01001165 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1166
Javier Martinez Canillase2c09ae2015-07-15 16:10:28 +02001167 if (!try_module_get(supply_rdev->owner))
1168 return -ENODEV;
1169
Mark Brown3801b862011-06-09 16:22:22 +01001170 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
Axel Lin32c78de2011-12-29 17:03:20 +08001171 if (rdev->supply == NULL) {
1172 err = -ENOMEM;
Mark Brown3801b862011-06-09 16:22:22 +01001173 return err;
Liam Girdwooda5766f12008-10-10 13:22:20 +01001174 }
Laxman Dewangan57ad526a2012-07-23 20:35:46 +05301175 supply_rdev->open_count++;
Mark Brown3801b862011-06-09 16:22:22 +01001176
1177 return 0;
Liam Girdwooda5766f12008-10-10 13:22:20 +01001178}
1179
1180/**
Randy Dunlap06c63f92010-11-18 15:02:26 -08001181 * set_consumer_device_supply - Bind a regulator to a symbolic supply
Mark Brown69279fb2008-12-31 12:52:41 +00001182 * @rdev: regulator source
Mark Brown40f92442009-06-17 17:56:39 +01001183 * @consumer_dev_name: dev_name() string for device supply applies to
Mark Brown69279fb2008-12-31 12:52:41 +00001184 * @supply: symbolic name for supply
Liam Girdwooda5766f12008-10-10 13:22:20 +01001185 *
1186 * Allows platform initialisation code to map physical regulator
1187 * sources to symbolic names for supplies for use by devices. Devices
1188 * should use these symbolic names to request regulators, avoiding the
1189 * need to provide board-specific regulator names as platform data.
1190 */
1191static int set_consumer_device_supply(struct regulator_dev *rdev,
Mark Brown737f3602012-02-02 00:10:51 +00001192 const char *consumer_dev_name,
1193 const char *supply)
Liam Girdwooda5766f12008-10-10 13:22:20 +01001194{
1195 struct regulator_map *node;
Mark Brown9ed20992009-07-21 16:00:26 +01001196 int has_dev;
Liam Girdwooda5766f12008-10-10 13:22:20 +01001197
1198 if (supply == NULL)
1199 return -EINVAL;
1200
Mark Brown9ed20992009-07-21 16:00:26 +01001201 if (consumer_dev_name != NULL)
1202 has_dev = 1;
1203 else
1204 has_dev = 0;
1205
David Brownell6001e132008-12-31 12:54:19 +00001206 list_for_each_entry(node, &regulator_map_list, list) {
Jani Nikula23b5cc22010-04-29 10:55:09 +03001207 if (node->dev_name && consumer_dev_name) {
1208 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1209 continue;
1210 } else if (node->dev_name || consumer_dev_name) {
David Brownell6001e132008-12-31 12:54:19 +00001211 continue;
Jani Nikula23b5cc22010-04-29 10:55:09 +03001212 }
1213
David Brownell6001e132008-12-31 12:54:19 +00001214 if (strcmp(node->supply, supply) != 0)
1215 continue;
1216
Mark Brown737f3602012-02-02 00:10:51 +00001217 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1218 consumer_dev_name,
1219 dev_name(&node->regulator->dev),
1220 node->regulator->desc->name,
1221 supply,
1222 dev_name(&rdev->dev), rdev_get_name(rdev));
David Brownell6001e132008-12-31 12:54:19 +00001223 return -EBUSY;
1224 }
1225
Mark Brown9ed20992009-07-21 16:00:26 +01001226 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
Liam Girdwooda5766f12008-10-10 13:22:20 +01001227 if (node == NULL)
1228 return -ENOMEM;
1229
1230 node->regulator = rdev;
Liam Girdwooda5766f12008-10-10 13:22:20 +01001231 node->supply = supply;
1232
Mark Brown9ed20992009-07-21 16:00:26 +01001233 if (has_dev) {
1234 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1235 if (node->dev_name == NULL) {
1236 kfree(node);
1237 return -ENOMEM;
1238 }
Mark Brown40f92442009-06-17 17:56:39 +01001239 }
1240
Liam Girdwooda5766f12008-10-10 13:22:20 +01001241 list_add(&node->list, &regulator_map_list);
1242 return 0;
1243}
1244
Mike Rapoport0f1d7472009-01-22 16:00:29 +02001245static void unset_regulator_supplies(struct regulator_dev *rdev)
1246{
1247 struct regulator_map *node, *n;
1248
1249 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1250 if (rdev == node->regulator) {
1251 list_del(&node->list);
Mark Brown40f92442009-06-17 17:56:39 +01001252 kfree(node->dev_name);
Mike Rapoport0f1d7472009-01-22 16:00:29 +02001253 kfree(node);
Mike Rapoport0f1d7472009-01-22 16:00:29 +02001254 }
1255 }
1256}
1257
Mark Brownf5726ae2011-06-09 16:22:20 +01001258#define REG_STR_SIZE 64
Liam Girdwood414c70c2008-04-30 15:59:04 +01001259
1260static struct regulator *create_regulator(struct regulator_dev *rdev,
1261 struct device *dev,
1262 const char *supply_name)
1263{
1264 struct regulator *regulator;
1265 char buf[REG_STR_SIZE];
1266 int err, size;
1267
1268 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1269 if (regulator == NULL)
1270 return NULL;
1271
1272 mutex_lock(&rdev->mutex);
1273 regulator->rdev = rdev;
1274 list_add(&regulator->list, &rdev->consumer_list);
1275
1276 if (dev) {
Shawn Guoe2c98ea2012-07-05 14:19:42 +08001277 regulator->dev = dev;
1278
Mark Brown222cc7b2012-06-22 11:39:16 +01001279 /* Add a link to the device sysfs entry */
Liam Girdwood414c70c2008-04-30 15:59:04 +01001280 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1281 dev->kobj.name, supply_name);
1282 if (size >= REG_STR_SIZE)
Mark Brown222cc7b2012-06-22 11:39:16 +01001283 goto overflow_err;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001284
1285 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1286 if (regulator->supply_name == NULL)
Mark Brown222cc7b2012-06-22 11:39:16 +01001287 goto overflow_err;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001288
Stephen Boydff268b52015-06-01 18:47:54 -07001289 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
Liam Girdwood414c70c2008-04-30 15:59:04 +01001290 buf);
1291 if (err) {
Stephen Boydff268b52015-06-01 18:47:54 -07001292 rdev_dbg(rdev, "could not add device link %s err %d\n",
Joe Perches5da84fd2010-11-30 05:53:48 -08001293 dev->kobj.name, err);
Mark Brown222cc7b2012-06-22 11:39:16 +01001294 /* non-fatal */
Liam Girdwood414c70c2008-04-30 15:59:04 +01001295 }
Mark Brown5de70512011-06-19 13:33:16 +01001296 } else {
1297 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1298 if (regulator->supply_name == NULL)
Mark Brown222cc7b2012-06-22 11:39:16 +01001299 goto overflow_err;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001300 }
Mark Brown5de70512011-06-19 13:33:16 +01001301
Mark Brown5de70512011-06-19 13:33:16 +01001302 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1303 rdev->debugfs);
Stephen Boyd24751432012-02-20 22:50:42 -08001304 if (!regulator->debugfs) {
Stephen Boydad3a9422015-06-01 18:47:55 -07001305 rdev_dbg(rdev, "Failed to create debugfs directory\n");
Mark Brown5de70512011-06-19 13:33:16 +01001306 } else {
1307 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1308 &regulator->uA_load);
1309 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1310 &regulator->min_uV);
1311 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1312 &regulator->max_uV);
1313 }
Mark Brown5de70512011-06-19 13:33:16 +01001314
Mark Brown6492bc12012-04-19 13:19:07 +01001315 /*
1316 * Check now if the regulator is an always on regulator - if
1317 * it is then we don't need to do nearly so much work for
1318 * enable/disable calls.
1319 */
1320 if (!_regulator_can_change_status(rdev) &&
1321 _regulator_is_enabled(rdev))
1322 regulator->always_on = true;
1323
Liam Girdwood414c70c2008-04-30 15:59:04 +01001324 mutex_unlock(&rdev->mutex);
1325 return regulator;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001326overflow_err:
1327 list_del(&regulator->list);
1328 kfree(regulator);
1329 mutex_unlock(&rdev->mutex);
1330 return NULL;
1331}
1332
Mark Brown31aae2b2009-12-21 12:21:52 +00001333static int _regulator_get_enable_time(struct regulator_dev *rdev)
1334{
Laxman Dewangan00c877c2013-09-18 18:18:02 +05301335 if (rdev->constraints && rdev->constraints->enable_time)
1336 return rdev->constraints->enable_time;
Mark Brown31aae2b2009-12-21 12:21:52 +00001337 if (!rdev->desc->ops->enable_time)
Mark Brown79511ed2012-06-27 14:23:10 +01001338 return rdev->desc->enable_time;
Mark Brown31aae2b2009-12-21 12:21:52 +00001339 return rdev->desc->ops->enable_time(rdev);
1340}
1341
Charles Keepaxa06ccd92013-10-15 20:14:20 +01001342static struct regulator_supply_alias *regulator_find_supply_alias(
1343 struct device *dev, const char *supply)
1344{
1345 struct regulator_supply_alias *map;
1346
1347 list_for_each_entry(map, &regulator_supply_alias_list, list)
1348 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1349 return map;
1350
1351 return NULL;
1352}
1353
1354static void regulator_supply_alias(struct device **dev, const char **supply)
1355{
1356 struct regulator_supply_alias *map;
1357
1358 map = regulator_find_supply_alias(*dev, *supply);
1359 if (map) {
1360 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1361 *supply, map->alias_supply,
1362 dev_name(map->alias_dev));
1363 *dev = map->alias_dev;
1364 *supply = map->alias_supply;
1365 }
1366}
1367
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001368static int of_node_match(struct device *dev, const void *data)
1369{
1370 return dev->of_node == data;
1371}
1372
1373static struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
1374{
1375 struct device *dev;
1376
1377 dev = class_find_device(&regulator_class, NULL, np, of_node_match);
1378
1379 return dev ? dev_to_rdev(dev) : NULL;
1380}
1381
1382static int regulator_match(struct device *dev, const void *data)
1383{
1384 struct regulator_dev *r = dev_to_rdev(dev);
1385
1386 return strcmp(rdev_get_name(r), data) == 0;
1387}
1388
1389static struct regulator_dev *regulator_lookup_by_name(const char *name)
1390{
1391 struct device *dev;
1392
1393 dev = class_find_device(&regulator_class, NULL, name, regulator_match);
1394
1395 return dev ? dev_to_rdev(dev) : NULL;
1396}
1397
1398/**
1399 * regulator_dev_lookup - lookup a regulator device.
1400 * @dev: device for regulator "consumer".
1401 * @supply: Supply name or regulator ID.
1402 * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if
1403 * lookup could succeed in the future.
1404 *
1405 * If successful, returns a struct regulator_dev that corresponds to the name
1406 * @supply and with the embedded struct device refcount incremented by one,
1407 * or NULL on failure. The refcount must be dropped by calling put_device().
1408 */
Rajendra Nayak69511a42011-11-18 16:47:20 +05301409static struct regulator_dev *regulator_dev_lookup(struct device *dev,
Mark Brown6d191a52012-03-29 14:19:02 +01001410 const char *supply,
1411 int *ret)
Rajendra Nayak69511a42011-11-18 16:47:20 +05301412{
1413 struct regulator_dev *r;
1414 struct device_node *node;
Mark Brown576ca4362012-03-30 12:24:37 +01001415 struct regulator_map *map;
1416 const char *devname = NULL;
Rajendra Nayak69511a42011-11-18 16:47:20 +05301417
Charles Keepaxa06ccd92013-10-15 20:14:20 +01001418 regulator_supply_alias(&dev, &supply);
1419
Rajendra Nayak69511a42011-11-18 16:47:20 +05301420 /* first do a dt based lookup */
1421 if (dev && dev->of_node) {
1422 node = of_get_regulator(dev, supply);
Mark Brown6d191a52012-03-29 14:19:02 +01001423 if (node) {
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001424 r = of_find_regulator_by_node(node);
1425 if (r)
1426 return r;
Mark Brown317b5682014-01-27 17:34:07 +00001427 *ret = -EPROBE_DEFER;
1428 return NULL;
Mark Brown6d191a52012-03-29 14:19:02 +01001429 } else {
1430 /*
1431 * If we couldn't even get the node then it's
1432 * not just that the device didn't register
1433 * yet, there's no node and we'll never
1434 * succeed.
1435 */
1436 *ret = -ENODEV;
1437 }
Rajendra Nayak69511a42011-11-18 16:47:20 +05301438 }
1439
1440 /* if not found, try doing it non-dt way */
Mark Brown576ca4362012-03-30 12:24:37 +01001441 if (dev)
1442 devname = dev_name(dev);
1443
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001444 r = regulator_lookup_by_name(supply);
1445 if (r)
1446 return r;
Rajendra Nayak69511a42011-11-18 16:47:20 +05301447
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001448 mutex_lock(&regulator_list_mutex);
Mark Brown576ca4362012-03-30 12:24:37 +01001449 list_for_each_entry(map, &regulator_map_list, list) {
1450 /* If the mapping has a device set up it must match */
1451 if (map->dev_name &&
1452 (!devname || strcmp(map->dev_name, devname)))
1453 continue;
1454
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001455 if (strcmp(map->supply, supply) == 0 &&
1456 get_device(&map->regulator->dev)) {
1457 mutex_unlock(&regulator_list_mutex);
Mark Brown576ca4362012-03-30 12:24:37 +01001458 return map->regulator;
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001459 }
Mark Brown576ca4362012-03-30 12:24:37 +01001460 }
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001461 mutex_unlock(&regulator_list_mutex);
Mark Brown576ca4362012-03-30 12:24:37 +01001462
Rajendra Nayak69511a42011-11-18 16:47:20 +05301463 return NULL;
1464}
1465
Bjorn Andersson6261b062015-03-24 18:56:05 -07001466static int regulator_resolve_supply(struct regulator_dev *rdev)
1467{
1468 struct regulator_dev *r;
1469 struct device *dev = rdev->dev.parent;
1470 int ret;
1471
1472 /* No supply to resovle? */
1473 if (!rdev->supply_name)
1474 return 0;
1475
1476 /* Supply already resolved? */
1477 if (rdev->supply)
1478 return 0;
1479
1480 r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
Bjorn Andersson6261b062015-03-24 18:56:05 -07001481 if (!r) {
Charles Keepax23c3f312015-09-17 14:50:20 +01001482 if (ret == -ENODEV) {
1483 /*
1484 * No supply was specified for this regulator and
1485 * there will never be one.
1486 */
1487 return 0;
1488 }
1489
Mark Brown06423122015-10-01 10:59:48 +01001490 /* Did the lookup explicitly defer for us? */
1491 if (ret == -EPROBE_DEFER)
1492 return ret;
1493
Mark Brown9f7e25e2015-07-14 11:17:26 +01001494 if (have_full_constraints()) {
1495 r = dummy_regulator_rdev;
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001496 get_device(&r->dev);
Mark Brown9f7e25e2015-07-14 11:17:26 +01001497 } else {
1498 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1499 rdev->supply_name, rdev->desc->name);
1500 return -EPROBE_DEFER;
1501 }
Bjorn Andersson6261b062015-03-24 18:56:05 -07001502 }
1503
1504 /* Recursively resolve the supply of the supply */
1505 ret = regulator_resolve_supply(r);
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001506 if (ret < 0) {
1507 put_device(&r->dev);
Bjorn Andersson6261b062015-03-24 18:56:05 -07001508 return ret;
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001509 }
Bjorn Andersson6261b062015-03-24 18:56:05 -07001510
1511 ret = set_supply(rdev, r);
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001512 if (ret < 0) {
1513 put_device(&r->dev);
Bjorn Andersson6261b062015-03-24 18:56:05 -07001514 return ret;
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001515 }
Bjorn Andersson6261b062015-03-24 18:56:05 -07001516
1517 /* Cascade always-on state to supply */
Sudip Mukherjee9f8df6a2015-09-02 16:14:06 +05301518 if (_regulator_is_enabled(rdev) && rdev->supply) {
Bjorn Andersson6261b062015-03-24 18:56:05 -07001519 ret = regulator_enable(rdev->supply);
Javier Martinez Canillas36a1f1b2015-07-15 16:10:29 +02001520 if (ret < 0) {
Sudip Mukherjee9f8df6a2015-09-02 16:14:06 +05301521 _regulator_put(rdev->supply);
Bjorn Andersson6261b062015-03-24 18:56:05 -07001522 return ret;
Javier Martinez Canillas36a1f1b2015-07-15 16:10:29 +02001523 }
Bjorn Andersson6261b062015-03-24 18:56:05 -07001524 }
1525
1526 return 0;
1527}
1528
Mark Brown5ffbd132009-07-21 16:00:23 +01001529/* Internal regulator request function */
1530static struct regulator *_regulator_get(struct device *dev, const char *id,
Mark Brown4ddfebd2013-09-13 19:50:37 +01001531 bool exclusive, bool allow_dummy)
Liam Girdwood414c70c2008-04-30 15:59:04 +01001532{
1533 struct regulator_dev *rdev;
Mark Brown04bf3012012-03-11 13:07:56 +00001534 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
Mark Brown40f92442009-06-17 17:56:39 +01001535 const char *devname = NULL;
Mark Brown317b5682014-01-27 17:34:07 +00001536 int ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001537
1538 if (id == NULL) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001539 pr_err("get() with no identifier\n");
Mark Brown043c9982013-09-20 12:32:18 +01001540 return ERR_PTR(-EINVAL);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001541 }
1542
Mark Brown40f92442009-06-17 17:56:39 +01001543 if (dev)
1544 devname = dev_name(dev);
1545
Mark Brown317b5682014-01-27 17:34:07 +00001546 if (have_full_constraints())
1547 ret = -ENODEV;
1548 else
1549 ret = -EPROBE_DEFER;
1550
Mark Brown6d191a52012-03-29 14:19:02 +01001551 rdev = regulator_dev_lookup(dev, id, &ret);
Rajendra Nayak69511a42011-11-18 16:47:20 +05301552 if (rdev)
1553 goto found;
1554
Mark Brownef60abb2013-09-23 16:12:52 +01001555 regulator = ERR_PTR(ret);
1556
Nishanth Menon1e4b5452013-04-16 16:45:16 -05001557 /*
1558 * If we have return value from dev_lookup fail, we do not expect to
1559 * succeed, so, quit with appropriate error value
1560 */
Jingoo Han0d25d092014-01-08 10:02:16 +09001561 if (ret && ret != -ENODEV)
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001562 return regulator;
Nishanth Menon1e4b5452013-04-16 16:45:16 -05001563
Mark Brown34abbd62010-02-12 10:18:08 +00001564 if (!devname)
1565 devname = "deviceless";
1566
Mark Brown4ddfebd2013-09-13 19:50:37 +01001567 /*
1568 * Assume that a regulator is physically present and enabled
1569 * even if it isn't hooked up and just provide a dummy.
Mark Brown34abbd62010-02-12 10:18:08 +00001570 */
Mark Brown87b28412013-11-27 16:13:10 +00001571 if (have_full_constraints() && allow_dummy) {
Joe Perches5da84fd2010-11-30 05:53:48 -08001572 pr_warn("%s supply %s not found, using dummy regulator\n",
1573 devname, id);
Mark Brown4ddfebd2013-09-13 19:50:37 +01001574
Mark Brown34abbd62010-02-12 10:18:08 +00001575 rdev = dummy_regulator_rdev;
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001576 get_device(&rdev->dev);
Mark Brown34abbd62010-02-12 10:18:08 +00001577 goto found;
Hans de Goede07817192013-12-17 16:24:57 +01001578 /* Don't log an error when called from regulator_get_optional() */
1579 } else if (!have_full_constraints() || exclusive) {
Shuah Khanacc3d5c2014-02-20 12:58:15 -07001580 dev_warn(dev, "dummy supplies not allowed\n");
Mark Brown34abbd62010-02-12 10:18:08 +00001581 }
Mark Brown34abbd62010-02-12 10:18:08 +00001582
Liam Girdwood414c70c2008-04-30 15:59:04 +01001583 return regulator;
1584
1585found:
Mark Brown5ffbd132009-07-21 16:00:23 +01001586 if (rdev->exclusive) {
1587 regulator = ERR_PTR(-EPERM);
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001588 put_device(&rdev->dev);
1589 return regulator;
Mark Brown5ffbd132009-07-21 16:00:23 +01001590 }
1591
1592 if (exclusive && rdev->open_count) {
1593 regulator = ERR_PTR(-EBUSY);
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001594 put_device(&rdev->dev);
1595 return regulator;
Mark Brown5ffbd132009-07-21 16:00:23 +01001596 }
1597
Bjorn Andersson6261b062015-03-24 18:56:05 -07001598 ret = regulator_resolve_supply(rdev);
1599 if (ret < 0) {
1600 regulator = ERR_PTR(ret);
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001601 put_device(&rdev->dev);
1602 return regulator;
Bjorn Andersson6261b062015-03-24 18:56:05 -07001603 }
1604
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001605 if (!try_module_get(rdev->owner)) {
1606 put_device(&rdev->dev);
1607 return regulator;
1608 }
Liam Girdwooda5766f12008-10-10 13:22:20 +01001609
Liam Girdwood414c70c2008-04-30 15:59:04 +01001610 regulator = create_regulator(rdev, dev, id);
1611 if (regulator == NULL) {
1612 regulator = ERR_PTR(-ENOMEM);
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001613 put_device(&rdev->dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001614 module_put(rdev->owner);
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001615 return regulator;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001616 }
1617
Mark Brown5ffbd132009-07-21 16:00:23 +01001618 rdev->open_count++;
1619 if (exclusive) {
1620 rdev->exclusive = 1;
1621
1622 ret = _regulator_is_enabled(rdev);
1623 if (ret > 0)
1624 rdev->use_count = 1;
1625 else
1626 rdev->use_count = 0;
1627 }
1628
Liam Girdwood414c70c2008-04-30 15:59:04 +01001629 return regulator;
1630}
Mark Brown5ffbd132009-07-21 16:00:23 +01001631
1632/**
1633 * regulator_get - lookup and obtain a reference to a regulator.
1634 * @dev: device for regulator "consumer"
1635 * @id: Supply name or regulator ID.
1636 *
1637 * Returns a struct regulator corresponding to the regulator producer,
1638 * or IS_ERR() condition containing errno.
1639 *
1640 * Use of supply names configured via regulator_set_device_supply() is
1641 * strongly encouraged. It is recommended that the supply name used
1642 * should match the name used for the supply and/or the relevant
1643 * device pins in the datasheet.
1644 */
1645struct regulator *regulator_get(struct device *dev, const char *id)
1646{
Mark Brown4ddfebd2013-09-13 19:50:37 +01001647 return _regulator_get(dev, id, false, true);
Mark Brown5ffbd132009-07-21 16:00:23 +01001648}
Liam Girdwood414c70c2008-04-30 15:59:04 +01001649EXPORT_SYMBOL_GPL(regulator_get);
1650
Stephen Boyd070b9072012-01-16 19:39:58 -08001651/**
Mark Brown5ffbd132009-07-21 16:00:23 +01001652 * regulator_get_exclusive - obtain exclusive access to a regulator.
1653 * @dev: device for regulator "consumer"
1654 * @id: Supply name or regulator ID.
1655 *
1656 * Returns a struct regulator corresponding to the regulator producer,
1657 * or IS_ERR() condition containing errno. Other consumers will be
Stephen Boyd69c3f722014-05-28 12:41:28 -07001658 * unable to obtain this regulator while this reference is held and the
1659 * use count for the regulator will be initialised to reflect the current
1660 * state of the regulator.
Mark Brown5ffbd132009-07-21 16:00:23 +01001661 *
1662 * This is intended for use by consumers which cannot tolerate shared
1663 * use of the regulator such as those which need to force the
1664 * regulator off for correct operation of the hardware they are
1665 * controlling.
1666 *
1667 * Use of supply names configured via regulator_set_device_supply() is
1668 * strongly encouraged. It is recommended that the supply name used
1669 * should match the name used for the supply and/or the relevant
1670 * device pins in the datasheet.
1671 */
1672struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1673{
Mark Brown4ddfebd2013-09-13 19:50:37 +01001674 return _regulator_get(dev, id, true, false);
Mark Brown5ffbd132009-07-21 16:00:23 +01001675}
1676EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1677
Mark Brownde1dd9f2013-07-29 21:42:42 +01001678/**
1679 * regulator_get_optional - obtain optional access to a regulator.
1680 * @dev: device for regulator "consumer"
1681 * @id: Supply name or regulator ID.
1682 *
1683 * Returns a struct regulator corresponding to the regulator producer,
Stephen Boyd69c3f722014-05-28 12:41:28 -07001684 * or IS_ERR() condition containing errno.
Mark Brownde1dd9f2013-07-29 21:42:42 +01001685 *
1686 * This is intended for use by consumers for devices which can have
1687 * some supplies unconnected in normal use, such as some MMC devices.
1688 * It can allow the regulator core to provide stub supplies for other
1689 * supplies requested using normal regulator_get() calls without
1690 * disrupting the operation of drivers that can handle absent
1691 * supplies.
1692 *
1693 * Use of supply names configured via regulator_set_device_supply() is
1694 * strongly encouraged. It is recommended that the supply name used
1695 * should match the name used for the supply and/or the relevant
1696 * device pins in the datasheet.
1697 */
1698struct regulator *regulator_get_optional(struct device *dev, const char *id)
1699{
Mark Brown4ddfebd2013-09-13 19:50:37 +01001700 return _regulator_get(dev, id, false, false);
Mark Brownde1dd9f2013-07-29 21:42:42 +01001701}
1702EXPORT_SYMBOL_GPL(regulator_get_optional);
1703
Ashay Jaiswal83b03022015-01-08 18:54:25 +05301704/* regulator_list_mutex lock held by regulator_put() */
Charles Keepax23ff2f02012-11-14 09:39:31 +00001705static void _regulator_put(struct regulator *regulator)
Liam Girdwood414c70c2008-04-30 15:59:04 +01001706{
1707 struct regulator_dev *rdev;
1708
Viresh Kumar93576842015-08-17 12:30:58 +05301709 if (IS_ERR_OR_NULL(regulator))
Liam Girdwood414c70c2008-04-30 15:59:04 +01001710 return;
1711
Krzysztof Kozlowski70cfef22015-06-29 09:04:43 +09001712 lockdep_assert_held_once(&regulator_list_mutex);
1713
Liam Girdwood414c70c2008-04-30 15:59:04 +01001714 rdev = regulator->rdev;
1715
Mark Brown5de70512011-06-19 13:33:16 +01001716 debugfs_remove_recursive(regulator->debugfs);
Mark Brown5de70512011-06-19 13:33:16 +01001717
Liam Girdwood414c70c2008-04-30 15:59:04 +01001718 /* remove any sysfs entries */
Shawn Guoe2c98ea2012-07-05 14:19:42 +08001719 if (regulator->dev)
Liam Girdwood414c70c2008-04-30 15:59:04 +01001720 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
Ashay Jaiswal83b03022015-01-08 18:54:25 +05301721 mutex_lock(&rdev->mutex);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001722 list_del(&regulator->list);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001723
Mark Brown5ffbd132009-07-21 16:00:23 +01001724 rdev->open_count--;
1725 rdev->exclusive = 0;
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02001726 put_device(&rdev->dev);
Ashay Jaiswal83b03022015-01-08 18:54:25 +05301727 mutex_unlock(&rdev->mutex);
Mark Brown5ffbd132009-07-21 16:00:23 +01001728
Mark Brown17685142015-08-07 21:19:26 +01001729 kfree(regulator->supply_name);
1730 kfree(regulator);
1731
Liam Girdwood414c70c2008-04-30 15:59:04 +01001732 module_put(rdev->owner);
Charles Keepax23ff2f02012-11-14 09:39:31 +00001733}
1734
1735/**
1736 * regulator_put - "free" the regulator source
1737 * @regulator: regulator source
1738 *
1739 * Note: drivers must ensure that all regulator_enable calls made on this
1740 * regulator source are balanced by regulator_disable calls prior to calling
1741 * this function.
1742 */
1743void regulator_put(struct regulator *regulator)
1744{
1745 mutex_lock(&regulator_list_mutex);
1746 _regulator_put(regulator);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001747 mutex_unlock(&regulator_list_mutex);
1748}
1749EXPORT_SYMBOL_GPL(regulator_put);
1750
Charles Keepaxa06ccd92013-10-15 20:14:20 +01001751/**
1752 * regulator_register_supply_alias - Provide device alias for supply lookup
1753 *
1754 * @dev: device that will be given as the regulator "consumer"
1755 * @id: Supply name or regulator ID
1756 * @alias_dev: device that should be used to lookup the supply
1757 * @alias_id: Supply name or regulator ID that should be used to lookup the
1758 * supply
1759 *
1760 * All lookups for id on dev will instead be conducted for alias_id on
1761 * alias_dev.
1762 */
1763int regulator_register_supply_alias(struct device *dev, const char *id,
1764 struct device *alias_dev,
1765 const char *alias_id)
1766{
1767 struct regulator_supply_alias *map;
1768
1769 map = regulator_find_supply_alias(dev, id);
1770 if (map)
1771 return -EEXIST;
1772
1773 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1774 if (!map)
1775 return -ENOMEM;
1776
1777 map->src_dev = dev;
1778 map->src_supply = id;
1779 map->alias_dev = alias_dev;
1780 map->alias_supply = alias_id;
1781
1782 list_add(&map->list, &regulator_supply_alias_list);
1783
1784 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1785 id, dev_name(dev), alias_id, dev_name(alias_dev));
1786
1787 return 0;
1788}
1789EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1790
1791/**
1792 * regulator_unregister_supply_alias - Remove device alias
1793 *
1794 * @dev: device that will be given as the regulator "consumer"
1795 * @id: Supply name or regulator ID
1796 *
1797 * Remove a lookup alias if one exists for id on dev.
1798 */
1799void regulator_unregister_supply_alias(struct device *dev, const char *id)
1800{
1801 struct regulator_supply_alias *map;
1802
1803 map = regulator_find_supply_alias(dev, id);
1804 if (map) {
1805 list_del(&map->list);
1806 kfree(map);
1807 }
1808}
1809EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1810
1811/**
1812 * regulator_bulk_register_supply_alias - register multiple aliases
1813 *
1814 * @dev: device that will be given as the regulator "consumer"
1815 * @id: List of supply names or regulator IDs
1816 * @alias_dev: device that should be used to lookup the supply
1817 * @alias_id: List of supply names or regulator IDs that should be used to
1818 * lookup the supply
1819 * @num_id: Number of aliases to register
1820 *
1821 * @return 0 on success, an errno on failure.
1822 *
1823 * This helper function allows drivers to register several supply
1824 * aliases in one operation. If any of the aliases cannot be
1825 * registered any aliases that were registered will be removed
1826 * before returning to the caller.
1827 */
Lee Jones9f8c0fe2014-05-23 16:44:10 +01001828int regulator_bulk_register_supply_alias(struct device *dev,
1829 const char *const *id,
Charles Keepaxa06ccd92013-10-15 20:14:20 +01001830 struct device *alias_dev,
Lee Jones9f8c0fe2014-05-23 16:44:10 +01001831 const char *const *alias_id,
Charles Keepaxa06ccd92013-10-15 20:14:20 +01001832 int num_id)
1833{
1834 int i;
1835 int ret;
1836
1837 for (i = 0; i < num_id; ++i) {
1838 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1839 alias_id[i]);
1840 if (ret < 0)
1841 goto err;
1842 }
1843
1844 return 0;
1845
1846err:
1847 dev_err(dev,
1848 "Failed to create supply alias %s,%s -> %s,%s\n",
1849 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1850
1851 while (--i >= 0)
1852 regulator_unregister_supply_alias(dev, id[i]);
1853
1854 return ret;
1855}
1856EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1857
1858/**
1859 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1860 *
1861 * @dev: device that will be given as the regulator "consumer"
1862 * @id: List of supply names or regulator IDs
1863 * @num_id: Number of aliases to unregister
1864 *
1865 * This helper function allows drivers to unregister several supply
1866 * aliases in one operation.
1867 */
1868void regulator_bulk_unregister_supply_alias(struct device *dev,
Lee Jones9f8c0fe2014-05-23 16:44:10 +01001869 const char *const *id,
Charles Keepaxa06ccd92013-10-15 20:14:20 +01001870 int num_id)
1871{
1872 int i;
1873
1874 for (i = 0; i < num_id; ++i)
1875 regulator_unregister_supply_alias(dev, id[i]);
1876}
1877EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1878
1879
Kim, Milof19b00d2013-02-18 06:50:39 +00001880/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1881static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1882 const struct regulator_config *config)
1883{
1884 struct regulator_enable_gpio *pin;
Russell King778b28b2014-06-29 17:55:54 +01001885 struct gpio_desc *gpiod;
Kim, Milof19b00d2013-02-18 06:50:39 +00001886 int ret;
1887
Russell King778b28b2014-06-29 17:55:54 +01001888 gpiod = gpio_to_desc(config->ena_gpio);
1889
Kim, Milof19b00d2013-02-18 06:50:39 +00001890 list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
Russell King778b28b2014-06-29 17:55:54 +01001891 if (pin->gpiod == gpiod) {
Kim, Milof19b00d2013-02-18 06:50:39 +00001892 rdev_dbg(rdev, "GPIO %d is already used\n",
1893 config->ena_gpio);
1894 goto update_ena_gpio_to_rdev;
1895 }
1896 }
1897
1898 ret = gpio_request_one(config->ena_gpio,
1899 GPIOF_DIR_OUT | config->ena_gpio_flags,
1900 rdev_get_name(rdev));
1901 if (ret)
1902 return ret;
1903
1904 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1905 if (pin == NULL) {
1906 gpio_free(config->ena_gpio);
1907 return -ENOMEM;
1908 }
1909
Russell King778b28b2014-06-29 17:55:54 +01001910 pin->gpiod = gpiod;
Kim, Milof19b00d2013-02-18 06:50:39 +00001911 pin->ena_gpio_invert = config->ena_gpio_invert;
1912 list_add(&pin->list, &regulator_ena_gpio_list);
1913
1914update_ena_gpio_to_rdev:
1915 pin->request_count++;
1916 rdev->ena_pin = pin;
1917 return 0;
1918}
1919
1920static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1921{
1922 struct regulator_enable_gpio *pin, *n;
1923
1924 if (!rdev->ena_pin)
1925 return;
1926
1927 /* Free the GPIO only in case of no use */
1928 list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
Russell King778b28b2014-06-29 17:55:54 +01001929 if (pin->gpiod == rdev->ena_pin->gpiod) {
Kim, Milof19b00d2013-02-18 06:50:39 +00001930 if (pin->request_count <= 1) {
1931 pin->request_count = 0;
Russell King778b28b2014-06-29 17:55:54 +01001932 gpiod_put(pin->gpiod);
Kim, Milof19b00d2013-02-18 06:50:39 +00001933 list_del(&pin->list);
1934 kfree(pin);
Seung-Woo Kim60a23622014-12-04 19:17:17 +09001935 rdev->ena_pin = NULL;
1936 return;
Kim, Milof19b00d2013-02-18 06:50:39 +00001937 } else {
1938 pin->request_count--;
1939 }
1940 }
1941 }
1942}
1943
Kim, Milo967cfb12013-02-18 06:50:48 +00001944/**
Robert P. J. Day31d6eeb2013-05-02 10:19:11 -04001945 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1946 * @rdev: regulator_dev structure
1947 * @enable: enable GPIO at initial use?
1948 *
Kim, Milo967cfb12013-02-18 06:50:48 +00001949 * GPIO is enabled in case of initial use. (enable_count is 0)
1950 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1951 */
1952static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1953{
1954 struct regulator_enable_gpio *pin = rdev->ena_pin;
1955
1956 if (!pin)
1957 return -EINVAL;
1958
1959 if (enable) {
1960 /* Enable GPIO at initial use */
1961 if (pin->enable_count == 0)
Russell King778b28b2014-06-29 17:55:54 +01001962 gpiod_set_value_cansleep(pin->gpiod,
1963 !pin->ena_gpio_invert);
Kim, Milo967cfb12013-02-18 06:50:48 +00001964
1965 pin->enable_count++;
1966 } else {
1967 if (pin->enable_count > 1) {
1968 pin->enable_count--;
1969 return 0;
1970 }
1971
1972 /* Disable GPIO if not used */
1973 if (pin->enable_count <= 1) {
Russell King778b28b2014-06-29 17:55:54 +01001974 gpiod_set_value_cansleep(pin->gpiod,
1975 pin->ena_gpio_invert);
Kim, Milo967cfb12013-02-18 06:50:48 +00001976 pin->enable_count = 0;
1977 }
1978 }
1979
1980 return 0;
1981}
1982
Guodong Xu79fd1142014-08-13 19:33:39 +08001983/**
1984 * _regulator_enable_delay - a delay helper function
1985 * @delay: time to delay in microseconds
1986 *
1987 * Delay for the requested amount of time as per the guidelines in:
1988 *
1989 * Documentation/timers/timers-howto.txt
1990 *
1991 * The assumption here is that regulators will never be enabled in
1992 * atomic context and therefore sleeping functions can be used.
1993 */
1994static void _regulator_enable_delay(unsigned int delay)
1995{
1996 unsigned int ms = delay / 1000;
1997 unsigned int us = delay % 1000;
1998
1999 if (ms > 0) {
2000 /*
2001 * For small enough values, handle super-millisecond
2002 * delays in the usleep_range() call below.
2003 */
2004 if (ms < 20)
2005 us += ms * 1000;
2006 else
2007 msleep(ms);
2008 }
2009
2010 /*
2011 * Give the scheduler some room to coalesce with any other
2012 * wakeup sources. For delays shorter than 10 us, don't even
2013 * bother setting up high-resolution timers and just busy-
2014 * loop.
2015 */
2016 if (us >= 10)
2017 usleep_range(us, us + 100);
2018 else
2019 udelay(us);
2020}
2021
Mark Brown5c5659d2012-06-27 13:21:26 +01002022static int _regulator_do_enable(struct regulator_dev *rdev)
2023{
2024 int ret, delay;
2025
2026 /* Query before enabling in case configuration dependent. */
2027 ret = _regulator_get_enable_time(rdev);
2028 if (ret >= 0) {
2029 delay = ret;
2030 } else {
2031 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2032 delay = 0;
2033 }
2034
2035 trace_regulator_enable(rdev_get_name(rdev));
2036
Guodong Xu871f5652014-08-13 19:33:40 +08002037 if (rdev->desc->off_on_delay) {
2038 /* if needed, keep a distance of off_on_delay from last time
2039 * this regulator was disabled.
2040 */
2041 unsigned long start_jiffy = jiffies;
2042 unsigned long intended, max_delay, remaining;
2043
2044 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2045 intended = rdev->last_off_jiffy + max_delay;
2046
2047 if (time_before(start_jiffy, intended)) {
2048 /* calc remaining jiffies to deal with one-time
2049 * timer wrapping.
2050 * in case of multiple timer wrapping, either it can be
2051 * detected by out-of-range remaining, or it cannot be
2052 * detected and we gets a panelty of
2053 * _regulator_enable_delay().
2054 */
2055 remaining = intended - start_jiffy;
2056 if (remaining <= max_delay)
2057 _regulator_enable_delay(
2058 jiffies_to_usecs(remaining));
2059 }
2060 }
2061
Kim, Milo967cfb12013-02-18 06:50:48 +00002062 if (rdev->ena_pin) {
Doug Anderson29d62ec2015-03-03 15:20:47 -08002063 if (!rdev->ena_gpio_state) {
2064 ret = regulator_ena_gpio_ctrl(rdev, true);
2065 if (ret < 0)
2066 return ret;
2067 rdev->ena_gpio_state = 1;
2068 }
Mark Brown65f73502012-06-27 14:14:38 +01002069 } else if (rdev->desc->ops->enable) {
Mark Brown5c5659d2012-06-27 13:21:26 +01002070 ret = rdev->desc->ops->enable(rdev);
2071 if (ret < 0)
2072 return ret;
2073 } else {
2074 return -EINVAL;
2075 }
2076
2077 /* Allow the regulator to ramp; it would be useful to extend
2078 * this for bulk operations so that the regulators can ramp
2079 * together. */
2080 trace_regulator_enable_delay(rdev_get_name(rdev));
2081
Guodong Xu79fd1142014-08-13 19:33:39 +08002082 _regulator_enable_delay(delay);
Mark Brown5c5659d2012-06-27 13:21:26 +01002083
2084 trace_regulator_enable_complete(rdev_get_name(rdev));
2085
2086 return 0;
2087}
2088
Liam Girdwood414c70c2008-04-30 15:59:04 +01002089/* locks held by regulator_enable() */
2090static int _regulator_enable(struct regulator_dev *rdev)
2091{
Mark Brown5c5659d2012-06-27 13:21:26 +01002092 int ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002093
Krzysztof Kozlowski70cfef22015-06-29 09:04:43 +09002094 lockdep_assert_held_once(&rdev->mutex);
2095
Liam Girdwood414c70c2008-04-30 15:59:04 +01002096 /* check voltage and requested load before enabling */
Mark Brown9a2372f2009-08-03 18:49:57 +01002097 if (rdev->constraints &&
2098 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
2099 drms_uA_update(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002100
Mark Brown9a2372f2009-08-03 18:49:57 +01002101 if (rdev->use_count == 0) {
2102 /* The regulator may on if it's not switchable or left on */
2103 ret = _regulator_is_enabled(rdev);
2104 if (ret == -EINVAL || ret == 0) {
2105 if (!_regulator_can_change_status(rdev))
2106 return -EPERM;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002107
Mark Brown5c5659d2012-06-27 13:21:26 +01002108 ret = _regulator_do_enable(rdev);
Mark Brown31aae2b2009-12-21 12:21:52 +00002109 if (ret < 0)
2110 return ret;
2111
Linus Walleija7433cf2009-08-26 12:54:04 +02002112 } else if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08002113 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002114 return ret;
2115 }
Linus Walleija7433cf2009-08-26 12:54:04 +02002116 /* Fallthrough on positive return values - already enabled */
Liam Girdwood414c70c2008-04-30 15:59:04 +01002117 }
2118
Mark Brown9a2372f2009-08-03 18:49:57 +01002119 rdev->use_count++;
2120
2121 return 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002122}
2123
2124/**
2125 * regulator_enable - enable regulator output
2126 * @regulator: regulator source
2127 *
Mark Browncf7bbcd2008-12-31 12:52:43 +00002128 * Request that the regulator be enabled with the regulator output at
2129 * the predefined voltage or current value. Calls to regulator_enable()
2130 * must be balanced with calls to regulator_disable().
2131 *
Liam Girdwood414c70c2008-04-30 15:59:04 +01002132 * NOTE: the output value can be set by other drivers, boot loader or may be
Mark Browncf7bbcd2008-12-31 12:52:43 +00002133 * hardwired in the regulator.
Liam Girdwood414c70c2008-04-30 15:59:04 +01002134 */
2135int regulator_enable(struct regulator *regulator)
2136{
David Brownell412aec62008-11-16 11:44:46 -08002137 struct regulator_dev *rdev = regulator->rdev;
2138 int ret = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002139
Mark Brown6492bc12012-04-19 13:19:07 +01002140 if (regulator->always_on)
2141 return 0;
2142
Mark Brown3801b862011-06-09 16:22:22 +01002143 if (rdev->supply) {
2144 ret = regulator_enable(rdev->supply);
2145 if (ret != 0)
2146 return ret;
2147 }
2148
David Brownell412aec62008-11-16 11:44:46 -08002149 mutex_lock(&rdev->mutex);
David Brownellcd94b502009-03-11 16:43:34 -08002150 ret = _regulator_enable(rdev);
David Brownell412aec62008-11-16 11:44:46 -08002151 mutex_unlock(&rdev->mutex);
Mark Brown3801b862011-06-09 16:22:22 +01002152
Heiko Stübnerd1685e42011-10-14 18:00:29 +02002153 if (ret != 0 && rdev->supply)
Mark Brown3801b862011-06-09 16:22:22 +01002154 regulator_disable(rdev->supply);
2155
Liam Girdwood414c70c2008-04-30 15:59:04 +01002156 return ret;
2157}
2158EXPORT_SYMBOL_GPL(regulator_enable);
2159
Mark Brown5c5659d2012-06-27 13:21:26 +01002160static int _regulator_do_disable(struct regulator_dev *rdev)
2161{
2162 int ret;
2163
2164 trace_regulator_disable(rdev_get_name(rdev));
2165
Kim, Milo967cfb12013-02-18 06:50:48 +00002166 if (rdev->ena_pin) {
Doug Anderson29d62ec2015-03-03 15:20:47 -08002167 if (rdev->ena_gpio_state) {
2168 ret = regulator_ena_gpio_ctrl(rdev, false);
2169 if (ret < 0)
2170 return ret;
2171 rdev->ena_gpio_state = 0;
2172 }
Mark Brown5c5659d2012-06-27 13:21:26 +01002173
2174 } else if (rdev->desc->ops->disable) {
2175 ret = rdev->desc->ops->disable(rdev);
2176 if (ret != 0)
2177 return ret;
2178 }
2179
Guodong Xu871f5652014-08-13 19:33:40 +08002180 /* cares about last_off_jiffy only if off_on_delay is required by
2181 * device.
2182 */
2183 if (rdev->desc->off_on_delay)
2184 rdev->last_off_jiffy = jiffies;
2185
Mark Brown5c5659d2012-06-27 13:21:26 +01002186 trace_regulator_disable_complete(rdev_get_name(rdev));
2187
Mark Brown5c5659d2012-06-27 13:21:26 +01002188 return 0;
2189}
2190
Liam Girdwood414c70c2008-04-30 15:59:04 +01002191/* locks held by regulator_disable() */
Mark Brown3801b862011-06-09 16:22:22 +01002192static int _regulator_disable(struct regulator_dev *rdev)
Liam Girdwood414c70c2008-04-30 15:59:04 +01002193{
2194 int ret = 0;
2195
Krzysztof Kozlowski70cfef22015-06-29 09:04:43 +09002196 lockdep_assert_held_once(&rdev->mutex);
2197
David Brownellcd94b502009-03-11 16:43:34 -08002198 if (WARN(rdev->use_count <= 0,
Joe Perches43e7ee32010-12-06 14:05:19 -08002199 "unbalanced disables for %s\n", rdev_get_name(rdev)))
David Brownellcd94b502009-03-11 16:43:34 -08002200 return -EIO;
2201
Liam Girdwood414c70c2008-04-30 15:59:04 +01002202 /* are we the last user and permitted to disable ? */
Mark Brown60ef66f2009-10-13 13:06:50 +01002203 if (rdev->use_count == 1 &&
2204 (rdev->constraints && !rdev->constraints->always_on)) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01002205
2206 /* we are last user */
Mark Brown5c5659d2012-06-27 13:21:26 +01002207 if (_regulator_can_change_status(rdev)) {
Richard Fitzgeralda1c8a552014-11-24 14:10:52 +00002208 ret = _notifier_call_chain(rdev,
2209 REGULATOR_EVENT_PRE_DISABLE,
2210 NULL);
2211 if (ret & NOTIFY_STOP_MASK)
2212 return -EINVAL;
2213
Mark Brown5c5659d2012-06-27 13:21:26 +01002214 ret = _regulator_do_disable(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002215 if (ret < 0) {
Joe Perches5da84fd2010-11-30 05:53:48 -08002216 rdev_err(rdev, "failed to disable\n");
Richard Fitzgeralda1c8a552014-11-24 14:10:52 +00002217 _notifier_call_chain(rdev,
2218 REGULATOR_EVENT_ABORT_DISABLE,
2219 NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002220 return ret;
2221 }
Markus Pargmann66fda752014-02-20 17:36:04 +01002222 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2223 NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002224 }
2225
Liam Girdwood414c70c2008-04-30 15:59:04 +01002226 rdev->use_count = 0;
2227 } else if (rdev->use_count > 1) {
2228
2229 if (rdev->constraints &&
2230 (rdev->constraints->valid_ops_mask &
2231 REGULATOR_CHANGE_DRMS))
2232 drms_uA_update(rdev);
2233
2234 rdev->use_count--;
2235 }
Mark Brown3801b862011-06-09 16:22:22 +01002236
Liam Girdwood414c70c2008-04-30 15:59:04 +01002237 return ret;
2238}
2239
2240/**
2241 * regulator_disable - disable regulator output
2242 * @regulator: regulator source
2243 *
Mark Browncf7bbcd2008-12-31 12:52:43 +00002244 * Disable the regulator output voltage or current. Calls to
2245 * regulator_enable() must be balanced with calls to
2246 * regulator_disable().
Mark Brown69279fb2008-12-31 12:52:41 +00002247 *
Liam Girdwood414c70c2008-04-30 15:59:04 +01002248 * NOTE: this will only disable the regulator output if no other consumer
Mark Browncf7bbcd2008-12-31 12:52:43 +00002249 * devices have it enabled, the regulator device supports disabling and
2250 * machine constraints permit this operation.
Liam Girdwood414c70c2008-04-30 15:59:04 +01002251 */
2252int regulator_disable(struct regulator *regulator)
2253{
David Brownell412aec62008-11-16 11:44:46 -08002254 struct regulator_dev *rdev = regulator->rdev;
2255 int ret = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002256
Mark Brown6492bc12012-04-19 13:19:07 +01002257 if (regulator->always_on)
2258 return 0;
2259
David Brownell412aec62008-11-16 11:44:46 -08002260 mutex_lock(&rdev->mutex);
Mark Brown3801b862011-06-09 16:22:22 +01002261 ret = _regulator_disable(rdev);
David Brownell412aec62008-11-16 11:44:46 -08002262 mutex_unlock(&rdev->mutex);
Jeffrey Carlyle8cbf8112010-10-08 14:49:19 -05002263
Mark Brown3801b862011-06-09 16:22:22 +01002264 if (ret == 0 && rdev->supply)
2265 regulator_disable(rdev->supply);
Jeffrey Carlyle8cbf8112010-10-08 14:49:19 -05002266
Liam Girdwood414c70c2008-04-30 15:59:04 +01002267 return ret;
2268}
2269EXPORT_SYMBOL_GPL(regulator_disable);
2270
2271/* locks held by regulator_force_disable() */
Mark Brown3801b862011-06-09 16:22:22 +01002272static int _regulator_force_disable(struct regulator_dev *rdev)
Liam Girdwood414c70c2008-04-30 15:59:04 +01002273{
2274 int ret = 0;
2275
Krzysztof Kozlowski70cfef22015-06-29 09:04:43 +09002276 lockdep_assert_held_once(&rdev->mutex);
2277
Richard Fitzgeralda1c8a552014-11-24 14:10:52 +00002278 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2279 REGULATOR_EVENT_PRE_DISABLE, NULL);
2280 if (ret & NOTIFY_STOP_MASK)
2281 return -EINVAL;
2282
Markus Pargmann66fda752014-02-20 17:36:04 +01002283 ret = _regulator_do_disable(rdev);
2284 if (ret < 0) {
2285 rdev_err(rdev, "failed to force disable\n");
Richard Fitzgeralda1c8a552014-11-24 14:10:52 +00002286 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2287 REGULATOR_EVENT_ABORT_DISABLE, NULL);
Markus Pargmann66fda752014-02-20 17:36:04 +01002288 return ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002289 }
2290
Markus Pargmann66fda752014-02-20 17:36:04 +01002291 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2292 REGULATOR_EVENT_DISABLE, NULL);
2293
2294 return 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002295}
2296
2297/**
2298 * regulator_force_disable - force disable regulator output
2299 * @regulator: regulator source
2300 *
2301 * Forcibly disable the regulator output voltage or current.
2302 * NOTE: this *will* disable the regulator output even if other consumer
2303 * devices have it enabled. This should be used for situations when device
2304 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2305 */
2306int regulator_force_disable(struct regulator *regulator)
2307{
Mark Brown82d15832011-05-09 11:41:02 +02002308 struct regulator_dev *rdev = regulator->rdev;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002309 int ret;
2310
Mark Brown82d15832011-05-09 11:41:02 +02002311 mutex_lock(&rdev->mutex);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002312 regulator->uA_load = 0;
Mark Brown3801b862011-06-09 16:22:22 +01002313 ret = _regulator_force_disable(regulator->rdev);
Mark Brown82d15832011-05-09 11:41:02 +02002314 mutex_unlock(&rdev->mutex);
Jeffrey Carlyle8cbf8112010-10-08 14:49:19 -05002315
Mark Brown3801b862011-06-09 16:22:22 +01002316 if (rdev->supply)
2317 while (rdev->open_count--)
2318 regulator_disable(rdev->supply);
Jeffrey Carlyle8cbf8112010-10-08 14:49:19 -05002319
Liam Girdwood414c70c2008-04-30 15:59:04 +01002320 return ret;
2321}
2322EXPORT_SYMBOL_GPL(regulator_force_disable);
2323
Mark Brownda07ecd2011-09-11 09:53:50 +01002324static void regulator_disable_work(struct work_struct *work)
2325{
2326 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2327 disable_work.work);
2328 int count, i, ret;
2329
2330 mutex_lock(&rdev->mutex);
2331
2332 BUG_ON(!rdev->deferred_disables);
2333
2334 count = rdev->deferred_disables;
2335 rdev->deferred_disables = 0;
2336
2337 for (i = 0; i < count; i++) {
2338 ret = _regulator_disable(rdev);
2339 if (ret != 0)
2340 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2341 }
2342
2343 mutex_unlock(&rdev->mutex);
2344
2345 if (rdev->supply) {
2346 for (i = 0; i < count; i++) {
2347 ret = regulator_disable(rdev->supply);
2348 if (ret != 0) {
2349 rdev_err(rdev,
2350 "Supply disable failed: %d\n", ret);
2351 }
2352 }
2353 }
2354}
2355
2356/**
2357 * regulator_disable_deferred - disable regulator output with delay
2358 * @regulator: regulator source
2359 * @ms: miliseconds until the regulator is disabled
2360 *
2361 * Execute regulator_disable() on the regulator after a delay. This
2362 * is intended for use with devices that require some time to quiesce.
2363 *
2364 * NOTE: this will only disable the regulator output if no other consumer
2365 * devices have it enabled, the regulator device supports disabling and
2366 * machine constraints permit this operation.
2367 */
2368int regulator_disable_deferred(struct regulator *regulator, int ms)
2369{
2370 struct regulator_dev *rdev = regulator->rdev;
2371
Mark Brown6492bc12012-04-19 13:19:07 +01002372 if (regulator->always_on)
2373 return 0;
2374
Mark Brown2b5a24a2012-09-07 11:00:53 +08002375 if (!ms)
2376 return regulator_disable(regulator);
2377
Mark Brownda07ecd2011-09-11 09:53:50 +01002378 mutex_lock(&rdev->mutex);
2379 rdev->deferred_disables++;
2380 mutex_unlock(&rdev->mutex);
2381
Dan Carpenter70dc6da2016-01-07 13:03:08 +03002382 queue_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2383 msecs_to_jiffies(ms));
2384 return 0;
Mark Brownda07ecd2011-09-11 09:53:50 +01002385}
2386EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2387
Liam Girdwood414c70c2008-04-30 15:59:04 +01002388static int _regulator_is_enabled(struct regulator_dev *rdev)
2389{
Mark Brown65f73502012-06-27 14:14:38 +01002390 /* A GPIO control always takes precedence */
Kim, Milo7b74d142013-02-18 06:50:55 +00002391 if (rdev->ena_pin)
Mark Brown65f73502012-06-27 14:14:38 +01002392 return rdev->ena_gpio_state;
2393
Mark Brown9a7f6a42010-02-11 17:22:45 +00002394 /* If we don't know then assume that the regulator is always on */
Mark Brown93325462009-08-03 18:49:56 +01002395 if (!rdev->desc->ops->is_enabled)
Mark Brown9a7f6a42010-02-11 17:22:45 +00002396 return 1;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002397
Mark Brown93325462009-08-03 18:49:56 +01002398 return rdev->desc->ops->is_enabled(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002399}
2400
Sascha Hauer3a40cfc2015-09-30 16:05:43 +02002401static int _regulator_list_voltage(struct regulator *regulator,
2402 unsigned selector, int lock)
2403{
2404 struct regulator_dev *rdev = regulator->rdev;
2405 const struct regulator_ops *ops = rdev->desc->ops;
2406 int ret;
2407
2408 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2409 return rdev->desc->fixed_uV;
2410
2411 if (ops->list_voltage) {
2412 if (selector >= rdev->desc->n_voltages)
2413 return -EINVAL;
2414 if (lock)
2415 mutex_lock(&rdev->mutex);
2416 ret = ops->list_voltage(rdev, selector);
2417 if (lock)
2418 mutex_unlock(&rdev->mutex);
2419 } else if (rdev->supply) {
2420 ret = _regulator_list_voltage(rdev->supply, selector, lock);
2421 } else {
2422 return -EINVAL;
2423 }
2424
2425 if (ret > 0) {
2426 if (ret < rdev->constraints->min_uV)
2427 ret = 0;
2428 else if (ret > rdev->constraints->max_uV)
2429 ret = 0;
2430 }
2431
2432 return ret;
2433}
2434
Liam Girdwood414c70c2008-04-30 15:59:04 +01002435/**
2436 * regulator_is_enabled - is the regulator output enabled
2437 * @regulator: regulator source
2438 *
David Brownell412aec62008-11-16 11:44:46 -08002439 * Returns positive if the regulator driver backing the source/client
2440 * has requested that the device be enabled, zero if it hasn't, else a
2441 * negative errno code.
2442 *
2443 * Note that the device backing this regulator handle can have multiple
2444 * users, so it might be enabled even if regulator_enable() was never
2445 * called for this particular source.
Liam Girdwood414c70c2008-04-30 15:59:04 +01002446 */
2447int regulator_is_enabled(struct regulator *regulator)
2448{
Mark Brown93325462009-08-03 18:49:56 +01002449 int ret;
2450
Mark Brown6492bc12012-04-19 13:19:07 +01002451 if (regulator->always_on)
2452 return 1;
2453
Mark Brown93325462009-08-03 18:49:56 +01002454 mutex_lock(&regulator->rdev->mutex);
2455 ret = _regulator_is_enabled(regulator->rdev);
2456 mutex_unlock(&regulator->rdev->mutex);
2457
2458 return ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002459}
2460EXPORT_SYMBOL_GPL(regulator_is_enabled);
2461
2462/**
Marek Szyprowskid1e7de32012-12-04 15:01:01 +01002463 * regulator_can_change_voltage - check if regulator can change voltage
2464 * @regulator: regulator source
2465 *
2466 * Returns positive if the regulator driver backing the source/client
Masanari Iidae2278672014-02-18 22:54:36 +09002467 * can change its voltage, false otherwise. Useful for detecting fixed
Marek Szyprowskid1e7de32012-12-04 15:01:01 +01002468 * or dummy regulators and disabling voltage change logic in the client
2469 * driver.
2470 */
2471int regulator_can_change_voltage(struct regulator *regulator)
2472{
2473 struct regulator_dev *rdev = regulator->rdev;
2474
2475 if (rdev->constraints &&
Axel Lin19280e42012-12-12 09:22:46 +08002476 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2477 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2478 return 1;
2479
2480 if (rdev->desc->continuous_voltage_range &&
2481 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2482 rdev->constraints->min_uV != rdev->constraints->max_uV)
2483 return 1;
2484 }
Marek Szyprowskid1e7de32012-12-04 15:01:01 +01002485
2486 return 0;
2487}
2488EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2489
2490/**
David Brownell4367cfd2009-02-26 11:48:36 -08002491 * regulator_count_voltages - count regulator_list_voltage() selectors
2492 * @regulator: regulator source
2493 *
2494 * Returns number of selectors, or negative errno. Selectors are
2495 * numbered starting at zero, and typically correspond to bitfields
2496 * in hardware registers.
2497 */
2498int regulator_count_voltages(struct regulator *regulator)
2499{
2500 struct regulator_dev *rdev = regulator->rdev;
2501
Javier Martinez Canillas26988ef2014-07-29 18:28:56 +02002502 if (rdev->desc->n_voltages)
2503 return rdev->desc->n_voltages;
2504
2505 if (!rdev->supply)
2506 return -EINVAL;
2507
2508 return regulator_count_voltages(rdev->supply);
David Brownell4367cfd2009-02-26 11:48:36 -08002509}
2510EXPORT_SYMBOL_GPL(regulator_count_voltages);
2511
2512/**
2513 * regulator_list_voltage - enumerate supported voltages
2514 * @regulator: regulator source
2515 * @selector: identify voltage to list
2516 * Context: can sleep
2517 *
2518 * Returns a voltage that can be passed to @regulator_set_voltage(),
Thomas Weber88393162010-03-16 11:47:56 +01002519 * zero if this selector code can't be used on this system, or a
David Brownell4367cfd2009-02-26 11:48:36 -08002520 * negative errno.
2521 */
2522int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2523{
Sascha Hauer3a40cfc2015-09-30 16:05:43 +02002524 return _regulator_list_voltage(regulator, selector, 1);
David Brownell4367cfd2009-02-26 11:48:36 -08002525}
2526EXPORT_SYMBOL_GPL(regulator_list_voltage);
2527
2528/**
Tuomas Tynkkynen04eca282014-07-21 18:38:48 +03002529 * regulator_get_regmap - get the regulator's register map
2530 * @regulator: regulator source
2531 *
2532 * Returns the register map for the given regulator, or an ERR_PTR value
2533 * if the regulator doesn't use regmap.
2534 */
2535struct regmap *regulator_get_regmap(struct regulator *regulator)
2536{
2537 struct regmap *map = regulator->rdev->regmap;
2538
2539 return map ? map : ERR_PTR(-EOPNOTSUPP);
2540}
2541
2542/**
2543 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2544 * @regulator: regulator source
2545 * @vsel_reg: voltage selector register, output parameter
2546 * @vsel_mask: mask for voltage selector bitfield, output parameter
2547 *
2548 * Returns the hardware register offset and bitmask used for setting the
2549 * regulator voltage. This might be useful when configuring voltage-scaling
2550 * hardware or firmware that can make I2C requests behind the kernel's back,
2551 * for example.
2552 *
2553 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2554 * and 0 is returned, otherwise a negative errno is returned.
2555 */
2556int regulator_get_hardware_vsel_register(struct regulator *regulator,
2557 unsigned *vsel_reg,
2558 unsigned *vsel_mask)
2559{
Guodong Xu39f54602014-08-19 18:07:41 +08002560 struct regulator_dev *rdev = regulator->rdev;
2561 const struct regulator_ops *ops = rdev->desc->ops;
Tuomas Tynkkynen04eca282014-07-21 18:38:48 +03002562
2563 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2564 return -EOPNOTSUPP;
2565
2566 *vsel_reg = rdev->desc->vsel_reg;
2567 *vsel_mask = rdev->desc->vsel_mask;
2568
2569 return 0;
2570}
2571EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2572
2573/**
2574 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2575 * @regulator: regulator source
2576 * @selector: identify voltage to list
2577 *
2578 * Converts the selector to a hardware-specific voltage selector that can be
2579 * directly written to the regulator registers. The address of the voltage
2580 * register can be determined by calling @regulator_get_hardware_vsel_register.
2581 *
2582 * On error a negative errno is returned.
2583 */
2584int regulator_list_hardware_vsel(struct regulator *regulator,
2585 unsigned selector)
2586{
Guodong Xu39f54602014-08-19 18:07:41 +08002587 struct regulator_dev *rdev = regulator->rdev;
2588 const struct regulator_ops *ops = rdev->desc->ops;
Tuomas Tynkkynen04eca282014-07-21 18:38:48 +03002589
2590 if (selector >= rdev->desc->n_voltages)
2591 return -EINVAL;
2592 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2593 return -EOPNOTSUPP;
2594
2595 return selector;
2596}
2597EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2598
2599/**
Paul Walmsley2a668a82013-06-07 08:06:56 +00002600 * regulator_get_linear_step - return the voltage step size between VSEL values
2601 * @regulator: regulator source
2602 *
2603 * Returns the voltage step size between VSEL values for linear
2604 * regulators, or return 0 if the regulator isn't a linear regulator.
2605 */
2606unsigned int regulator_get_linear_step(struct regulator *regulator)
2607{
2608 struct regulator_dev *rdev = regulator->rdev;
2609
2610 return rdev->desc->uV_step;
2611}
2612EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2613
2614/**
Mark Browna7a1ad92009-07-21 16:00:24 +01002615 * regulator_is_supported_voltage - check if a voltage range can be supported
2616 *
2617 * @regulator: Regulator to check.
2618 * @min_uV: Minimum required voltage in uV.
2619 * @max_uV: Maximum required voltage in uV.
2620 *
2621 * Returns a boolean or a negative error code.
2622 */
2623int regulator_is_supported_voltage(struct regulator *regulator,
2624 int min_uV, int max_uV)
2625{
Mark Brownc5f39392012-07-02 15:00:18 +01002626 struct regulator_dev *rdev = regulator->rdev;
Mark Browna7a1ad92009-07-21 16:00:24 +01002627 int i, voltages, ret;
2628
Mark Brownc5f39392012-07-02 15:00:18 +01002629 /* If we can't change voltage check the current voltage */
2630 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2631 ret = regulator_get_voltage(regulator);
2632 if (ret >= 0)
Jingoo Han0d25d092014-01-08 10:02:16 +09002633 return min_uV <= ret && ret <= max_uV;
Mark Brownc5f39392012-07-02 15:00:18 +01002634 else
2635 return ret;
2636 }
2637
Pawel Mollbd7a2b62012-09-24 18:56:53 +01002638 /* Any voltage within constrains range is fine? */
2639 if (rdev->desc->continuous_voltage_range)
2640 return min_uV >= rdev->constraints->min_uV &&
2641 max_uV <= rdev->constraints->max_uV;
2642
Mark Browna7a1ad92009-07-21 16:00:24 +01002643 ret = regulator_count_voltages(regulator);
2644 if (ret < 0)
2645 return ret;
2646 voltages = ret;
2647
2648 for (i = 0; i < voltages; i++) {
2649 ret = regulator_list_voltage(regulator, i);
2650
2651 if (ret >= min_uV && ret <= max_uV)
2652 return 1;
2653 }
2654
2655 return 0;
2656}
Mark Browna398eaa2011-12-28 12:48:45 +00002657EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
Mark Browna7a1ad92009-07-21 16:00:24 +01002658
Sascha Hauera204f412015-10-20 14:37:27 +02002659static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2660 int max_uV)
2661{
2662 const struct regulator_desc *desc = rdev->desc;
2663
2664 if (desc->ops->map_voltage)
2665 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2666
2667 if (desc->ops->list_voltage == regulator_list_voltage_linear)
2668 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2669
2670 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2671 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2672
2673 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2674}
2675
Heiko Stübner71795692014-08-28 12:36:04 -07002676static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2677 int min_uV, int max_uV,
2678 unsigned *selector)
2679{
2680 struct pre_voltage_change_data data;
2681 int ret;
2682
2683 data.old_uV = _regulator_get_voltage(rdev);
2684 data.min_uV = min_uV;
2685 data.max_uV = max_uV;
2686 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2687 &data);
2688 if (ret & NOTIFY_STOP_MASK)
2689 return -EINVAL;
2690
2691 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2692 if (ret >= 0)
2693 return ret;
2694
2695 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2696 (void *)data.old_uV);
2697
2698 return ret;
2699}
2700
2701static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2702 int uV, unsigned selector)
2703{
2704 struct pre_voltage_change_data data;
2705 int ret;
2706
2707 data.old_uV = _regulator_get_voltage(rdev);
2708 data.min_uV = uV;
2709 data.max_uV = uV;
2710 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2711 &data);
2712 if (ret & NOTIFY_STOP_MASK)
2713 return -EINVAL;
2714
2715 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2716 if (ret >= 0)
2717 return ret;
2718
2719 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2720 (void *)data.old_uV);
2721
2722 return ret;
2723}
2724
Mark Brown75790252010-12-12 14:25:50 +00002725static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2726 int min_uV, int max_uV)
2727{
2728 int ret;
Linus Walleij77af1b2642011-03-17 13:24:36 +01002729 int delay = 0;
Mark Browne113d792012-06-26 10:57:51 +01002730 int best_val = 0;
Mark Brown75790252010-12-12 14:25:50 +00002731 unsigned int selector;
Axel Lineba41a52012-04-04 10:32:10 +08002732 int old_selector = -1;
Mark Brown75790252010-12-12 14:25:50 +00002733
2734 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2735
Mark Brownbf5892a2011-05-08 22:13:37 +01002736 min_uV += rdev->constraints->uV_offset;
2737 max_uV += rdev->constraints->uV_offset;
2738
Axel Lineba41a52012-04-04 10:32:10 +08002739 /*
2740 * If we can't obtain the old selector there is not enough
2741 * info to call set_voltage_time_sel().
2742 */
Axel Lin8b7485e2012-05-21 09:37:52 +08002743 if (_regulator_is_enabled(rdev) &&
2744 rdev->desc->ops->set_voltage_time_sel &&
Axel Lineba41a52012-04-04 10:32:10 +08002745 rdev->desc->ops->get_voltage_sel) {
2746 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2747 if (old_selector < 0)
2748 return old_selector;
2749 }
2750
Mark Brown75790252010-12-12 14:25:50 +00002751 if (rdev->desc->ops->set_voltage) {
Heiko Stübner71795692014-08-28 12:36:04 -07002752 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2753 &selector);
Mark Browne113d792012-06-26 10:57:51 +01002754
2755 if (ret >= 0) {
2756 if (rdev->desc->ops->list_voltage)
2757 best_val = rdev->desc->ops->list_voltage(rdev,
2758 selector);
2759 else
2760 best_val = _regulator_get_voltage(rdev);
2761 }
2762
Mark Browne8eef822010-12-12 14:36:17 +00002763 } else if (rdev->desc->ops->set_voltage_sel) {
Sascha Hauera204f412015-10-20 14:37:27 +02002764 ret = regulator_map_voltage(rdev, min_uV, max_uV);
Mark Browne843fc42012-05-09 21:16:06 +01002765 if (ret >= 0) {
Mark Browne113d792012-06-26 10:57:51 +01002766 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2767 if (min_uV <= best_val && max_uV >= best_val) {
2768 selector = ret;
Axel Linc66a5662013-02-06 11:09:48 +08002769 if (old_selector == selector)
2770 ret = 0;
2771 else
Heiko Stübner71795692014-08-28 12:36:04 -07002772 ret = _regulator_call_set_voltage_sel(
2773 rdev, best_val, selector);
Mark Browne113d792012-06-26 10:57:51 +01002774 } else {
2775 ret = -EINVAL;
2776 }
Mark Browne8eef822010-12-12 14:36:17 +00002777 }
Mark Brown75790252010-12-12 14:25:50 +00002778 } else {
2779 ret = -EINVAL;
2780 }
2781
Axel Lineba41a52012-04-04 10:32:10 +08002782 /* Call set_voltage_time_sel if successfully obtained old_selector */
Yadwinder Singh Brar5b175952013-06-29 18:21:19 +05302783 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2784 && old_selector != selector) {
Axel Lineba41a52012-04-04 10:32:10 +08002785
2786 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2787 old_selector, selector);
2788 if (delay < 0) {
2789 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2790 delay);
2791 delay = 0;
2792 }
Axel Lineba41a52012-04-04 10:32:10 +08002793
Philip Rakity8b96de32012-06-14 15:07:56 -07002794 /* Insert any necessary delays */
2795 if (delay >= 1000) {
2796 mdelay(delay / 1000);
2797 udelay(delay % 1000);
2798 } else if (delay) {
2799 udelay(delay);
2800 }
Linus Walleij77af1b2642011-03-17 13:24:36 +01002801 }
2802
Axel Lin2f6c7972012-08-06 23:44:19 +08002803 if (ret == 0 && best_val >= 0) {
2804 unsigned long data = best_val;
2805
Mark Brownded06a52010-12-16 13:59:10 +00002806 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
Axel Lin2f6c7972012-08-06 23:44:19 +08002807 (void *)data);
2808 }
Mark Brownded06a52010-12-16 13:59:10 +00002809
Axel Lineba41a52012-04-04 10:32:10 +08002810 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
Mark Brown75790252010-12-12 14:25:50 +00002811
2812 return ret;
2813}
2814
Sascha Hauera9f226b2015-10-13 12:45:25 +02002815static int regulator_set_voltage_unlocked(struct regulator *regulator,
2816 int min_uV, int max_uV)
Liam Girdwood414c70c2008-04-30 15:59:04 +01002817{
2818 struct regulator_dev *rdev = regulator->rdev;
Mark Brown95a3c232010-12-16 15:49:37 +00002819 int ret = 0;
Paolo Pisati92d7a552012-12-13 10:13:00 +01002820 int old_min_uV, old_max_uV;
Bjorn Anderssonc00dc352014-02-05 12:30:26 -08002821 int current_uV;
Sascha Hauerfc421122015-10-20 14:37:28 +02002822 int best_supply_uV = 0;
2823 int supply_change_uV = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002824
Mark Brown95a3c232010-12-16 15:49:37 +00002825 /* If we're setting the same range as last time the change
2826 * should be a noop (some cpufreq implementations use the same
2827 * voltage for multiple frequencies, for example).
2828 */
2829 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2830 goto out;
2831
Bjorn Anderssonc00dc352014-02-05 12:30:26 -08002832 /* If we're trying to set a range that overlaps the current voltage,
Viresh Kumard3fb9802015-08-13 18:09:49 +05302833 * return successfully even though the regulator does not support
Bjorn Anderssonc00dc352014-02-05 12:30:26 -08002834 * changing the voltage.
2835 */
2836 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2837 current_uV = _regulator_get_voltage(rdev);
2838 if (min_uV <= current_uV && current_uV <= max_uV) {
2839 regulator->min_uV = min_uV;
2840 regulator->max_uV = max_uV;
2841 goto out;
2842 }
2843 }
2844
Liam Girdwood414c70c2008-04-30 15:59:04 +01002845 /* sanity check */
Mark Browne8eef822010-12-12 14:36:17 +00002846 if (!rdev->desc->ops->set_voltage &&
2847 !rdev->desc->ops->set_voltage_sel) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01002848 ret = -EINVAL;
2849 goto out;
2850 }
2851
2852 /* constraints check */
2853 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2854 if (ret < 0)
2855 goto out;
Jingoo Han0d25d092014-01-08 10:02:16 +09002856
Paolo Pisati92d7a552012-12-13 10:13:00 +01002857 /* restore original values in case of error */
2858 old_min_uV = regulator->min_uV;
2859 old_max_uV = regulator->max_uV;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002860 regulator->min_uV = min_uV;
2861 regulator->max_uV = max_uV;
Mark Brown3a93f2a2010-11-10 14:38:29 +00002862
Thomas Petazzoni05fda3b1a2010-12-03 11:31:07 +01002863 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2864 if (ret < 0)
Paolo Pisati92d7a552012-12-13 10:13:00 +01002865 goto out2;
Thomas Petazzoni05fda3b1a2010-12-03 11:31:07 +01002866
Sascha Hauerfc421122015-10-20 14:37:28 +02002867 if (rdev->supply && (rdev->desc->min_dropout_uV ||
2868 !rdev->desc->ops->get_voltage)) {
2869 int current_supply_uV;
2870 int selector;
2871
2872 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2873 if (selector < 0) {
2874 ret = selector;
2875 goto out2;
2876 }
2877
2878 best_supply_uV = _regulator_list_voltage(regulator, selector, 0);
2879 if (best_supply_uV < 0) {
2880 ret = best_supply_uV;
2881 goto out2;
2882 }
2883
2884 best_supply_uV += rdev->desc->min_dropout_uV;
2885
2886 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2887 if (current_supply_uV < 0) {
2888 ret = current_supply_uV;
2889 goto out2;
2890 }
2891
2892 supply_change_uV = best_supply_uV - current_supply_uV;
2893 }
2894
2895 if (supply_change_uV > 0) {
2896 ret = regulator_set_voltage_unlocked(rdev->supply,
2897 best_supply_uV, INT_MAX);
2898 if (ret) {
2899 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
2900 ret);
2901 goto out2;
2902 }
2903 }
2904
Mark Brown75790252010-12-12 14:25:50 +00002905 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
Paolo Pisati92d7a552012-12-13 10:13:00 +01002906 if (ret < 0)
2907 goto out2;
Jingoo Han0d25d092014-01-08 10:02:16 +09002908
Sascha Hauerfc421122015-10-20 14:37:28 +02002909 if (supply_change_uV < 0) {
2910 ret = regulator_set_voltage_unlocked(rdev->supply,
2911 best_supply_uV, INT_MAX);
2912 if (ret)
2913 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
2914 ret);
2915 /* No need to fail here */
2916 ret = 0;
2917 }
2918
Liam Girdwood414c70c2008-04-30 15:59:04 +01002919out:
Liam Girdwood414c70c2008-04-30 15:59:04 +01002920 return ret;
Paolo Pisati92d7a552012-12-13 10:13:00 +01002921out2:
2922 regulator->min_uV = old_min_uV;
2923 regulator->max_uV = old_max_uV;
Sascha Hauera9f226b2015-10-13 12:45:25 +02002924
2925 return ret;
2926}
2927
2928/**
2929 * regulator_set_voltage - set regulator output voltage
2930 * @regulator: regulator source
2931 * @min_uV: Minimum required voltage in uV
2932 * @max_uV: Maximum acceptable voltage in uV
2933 *
2934 * Sets a voltage regulator to the desired output voltage. This can be set
2935 * during any regulator state. IOW, regulator can be disabled or enabled.
2936 *
2937 * If the regulator is enabled then the voltage will change to the new value
2938 * immediately otherwise if the regulator is disabled the regulator will
2939 * output at the new voltage when enabled.
2940 *
2941 * NOTE: If the regulator is shared between several devices then the lowest
2942 * request voltage that meets the system constraints will be used.
2943 * Regulator system constraints must be set for this regulator before
2944 * calling this function otherwise this call will fail.
2945 */
2946int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2947{
2948 int ret = 0;
2949
Sascha Hauerfc421122015-10-20 14:37:28 +02002950 regulator_lock_supply(regulator->rdev);
Sascha Hauera9f226b2015-10-13 12:45:25 +02002951
2952 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
2953
Sascha Hauerfc421122015-10-20 14:37:28 +02002954 regulator_unlock_supply(regulator->rdev);
Sascha Hauera9f226b2015-10-13 12:45:25 +02002955
Paolo Pisati92d7a552012-12-13 10:13:00 +01002956 return ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002957}
2958EXPORT_SYMBOL_GPL(regulator_set_voltage);
2959
Mark Brown606a2562010-12-16 15:49:36 +00002960/**
Linus Walleij88cd222b2011-03-17 13:24:52 +01002961 * regulator_set_voltage_time - get raise/fall time
2962 * @regulator: regulator source
2963 * @old_uV: starting voltage in microvolts
2964 * @new_uV: target voltage in microvolts
2965 *
2966 * Provided with the starting and ending voltage, this function attempts to
2967 * calculate the time in microseconds required to rise or fall to this new
2968 * voltage.
2969 */
2970int regulator_set_voltage_time(struct regulator *regulator,
2971 int old_uV, int new_uV)
2972{
Guodong Xu272e2312014-08-13 19:33:38 +08002973 struct regulator_dev *rdev = regulator->rdev;
2974 const struct regulator_ops *ops = rdev->desc->ops;
Linus Walleij88cd222b2011-03-17 13:24:52 +01002975 int old_sel = -1;
2976 int new_sel = -1;
2977 int voltage;
2978 int i;
2979
2980 /* Currently requires operations to do this */
2981 if (!ops->list_voltage || !ops->set_voltage_time_sel
2982 || !rdev->desc->n_voltages)
2983 return -EINVAL;
2984
2985 for (i = 0; i < rdev->desc->n_voltages; i++) {
2986 /* We only look for exact voltage matches here */
2987 voltage = regulator_list_voltage(regulator, i);
2988 if (voltage < 0)
2989 return -EINVAL;
2990 if (voltage == 0)
2991 continue;
2992 if (voltage == old_uV)
2993 old_sel = i;
2994 if (voltage == new_uV)
2995 new_sel = i;
2996 }
2997
2998 if (old_sel < 0 || new_sel < 0)
2999 return -EINVAL;
3000
3001 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3002}
3003EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3004
3005/**
Randy Dunlap296c6562012-08-18 17:44:14 -07003006 * regulator_set_voltage_time_sel - get raise/fall time
3007 * @rdev: regulator source device
Yadwinder Singh Brar98a175b2012-06-09 16:40:38 +05303008 * @old_selector: selector for starting voltage
3009 * @new_selector: selector for target voltage
3010 *
3011 * Provided with the starting and target voltage selectors, this function
3012 * returns time in microseconds required to rise or fall to this new voltage
3013 *
Axel Linf11d08c2012-06-19 09:38:45 +08003014 * Drivers providing ramp_delay in regulation_constraints can use this as their
Axel Lin398715a2012-06-18 10:11:28 +08003015 * set_voltage_time_sel() operation.
Yadwinder Singh Brar98a175b2012-06-09 16:40:38 +05303016 */
3017int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3018 unsigned int old_selector,
3019 unsigned int new_selector)
3020{
Axel Lin398715a2012-06-18 10:11:28 +08003021 unsigned int ramp_delay = 0;
Axel Linf11d08c2012-06-19 09:38:45 +08003022 int old_volt, new_volt;
Axel Lin398715a2012-06-18 10:11:28 +08003023
3024 if (rdev->constraints->ramp_delay)
3025 ramp_delay = rdev->constraints->ramp_delay;
3026 else if (rdev->desc->ramp_delay)
3027 ramp_delay = rdev->desc->ramp_delay;
3028
3029 if (ramp_delay == 0) {
Yadwinder Singh Brar6f0b2c62012-06-11 17:41:08 +05303030 rdev_warn(rdev, "ramp_delay not set\n");
Axel Lin398715a2012-06-18 10:11:28 +08003031 return 0;
Yadwinder Singh Brar6f0b2c62012-06-11 17:41:08 +05303032 }
Axel Lin398715a2012-06-18 10:11:28 +08003033
Axel Linf11d08c2012-06-19 09:38:45 +08003034 /* sanity check */
3035 if (!rdev->desc->ops->list_voltage)
3036 return -EINVAL;
Axel Lin398715a2012-06-18 10:11:28 +08003037
Axel Linf11d08c2012-06-19 09:38:45 +08003038 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3039 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3040
3041 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
Yadwinder Singh Brar98a175b2012-06-09 16:40:38 +05303042}
Mark Brownb19dbf72012-06-23 11:34:20 +01003043EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
Yadwinder Singh Brar98a175b2012-06-09 16:40:38 +05303044
3045/**
Mark Brown606a2562010-12-16 15:49:36 +00003046 * regulator_sync_voltage - re-apply last regulator output voltage
3047 * @regulator: regulator source
3048 *
3049 * Re-apply the last configured voltage. This is intended to be used
3050 * where some external control source the consumer is cooperating with
3051 * has caused the configured voltage to change.
3052 */
3053int regulator_sync_voltage(struct regulator *regulator)
3054{
3055 struct regulator_dev *rdev = regulator->rdev;
3056 int ret, min_uV, max_uV;
3057
3058 mutex_lock(&rdev->mutex);
3059
3060 if (!rdev->desc->ops->set_voltage &&
3061 !rdev->desc->ops->set_voltage_sel) {
3062 ret = -EINVAL;
3063 goto out;
3064 }
3065
3066 /* This is only going to work if we've had a voltage configured. */
3067 if (!regulator->min_uV && !regulator->max_uV) {
3068 ret = -EINVAL;
3069 goto out;
3070 }
3071
3072 min_uV = regulator->min_uV;
3073 max_uV = regulator->max_uV;
3074
3075 /* This should be a paranoia check... */
3076 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3077 if (ret < 0)
3078 goto out;
3079
3080 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
3081 if (ret < 0)
3082 goto out;
3083
3084 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3085
3086out:
3087 mutex_unlock(&rdev->mutex);
3088 return ret;
3089}
3090EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3091
Liam Girdwood414c70c2008-04-30 15:59:04 +01003092static int _regulator_get_voltage(struct regulator_dev *rdev)
3093{
Mark Brownbf5892a2011-05-08 22:13:37 +01003094 int sel, ret;
Mark Brown476c2d82010-12-10 17:28:07 +00003095
3096 if (rdev->desc->ops->get_voltage_sel) {
3097 sel = rdev->desc->ops->get_voltage_sel(rdev);
3098 if (sel < 0)
3099 return sel;
Mark Brownbf5892a2011-05-08 22:13:37 +01003100 ret = rdev->desc->ops->list_voltage(rdev, sel);
Axel Lincb220d12011-05-23 20:08:10 +08003101 } else if (rdev->desc->ops->get_voltage) {
Mark Brownbf5892a2011-05-08 22:13:37 +01003102 ret = rdev->desc->ops->get_voltage(rdev);
Mark Brownf7df20e2012-08-09 16:42:19 +01003103 } else if (rdev->desc->ops->list_voltage) {
3104 ret = rdev->desc->ops->list_voltage(rdev, 0);
Laxman Dewangan5a523602013-09-10 15:45:05 +05303105 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3106 ret = rdev->desc->fixed_uV;
Javier Martinez Canillase3039962014-07-29 18:28:55 +02003107 } else if (rdev->supply) {
Mark Brownd9b96d32015-11-03 05:58:14 +00003108 ret = _regulator_get_voltage(rdev->supply->rdev);
Axel Lincb220d12011-05-23 20:08:10 +08003109 } else {
Liam Girdwood414c70c2008-04-30 15:59:04 +01003110 return -EINVAL;
Axel Lincb220d12011-05-23 20:08:10 +08003111 }
Mark Brownbf5892a2011-05-08 22:13:37 +01003112
Axel Lincb220d12011-05-23 20:08:10 +08003113 if (ret < 0)
3114 return ret;
Mark Brownbf5892a2011-05-08 22:13:37 +01003115 return ret - rdev->constraints->uV_offset;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003116}
3117
3118/**
3119 * regulator_get_voltage - get regulator output voltage
3120 * @regulator: regulator source
3121 *
3122 * This returns the current regulator voltage in uV.
3123 *
3124 * NOTE: If the regulator is disabled it will return the voltage value. This
3125 * function should not be used to determine regulator state.
3126 */
3127int regulator_get_voltage(struct regulator *regulator)
3128{
3129 int ret;
3130
Mark Brownd9b96d32015-11-03 05:58:14 +00003131 regulator_lock_supply(regulator->rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003132
3133 ret = _regulator_get_voltage(regulator->rdev);
3134
Mark Brownd9b96d32015-11-03 05:58:14 +00003135 regulator_unlock_supply(regulator->rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003136
3137 return ret;
3138}
3139EXPORT_SYMBOL_GPL(regulator_get_voltage);
3140
3141/**
3142 * regulator_set_current_limit - set regulator output current limit
3143 * @regulator: regulator source
Charles Keepaxce0d10f2013-05-21 15:04:07 +01003144 * @min_uA: Minimum supported current in uA
Liam Girdwood414c70c2008-04-30 15:59:04 +01003145 * @max_uA: Maximum supported current in uA
3146 *
3147 * Sets current sink to the desired output current. This can be set during
3148 * any regulator state. IOW, regulator can be disabled or enabled.
3149 *
3150 * If the regulator is enabled then the current will change to the new value
3151 * immediately otherwise if the regulator is disabled the regulator will
3152 * output at the new current when enabled.
3153 *
3154 * NOTE: Regulator system constraints must be set for this regulator before
3155 * calling this function otherwise this call will fail.
3156 */
3157int regulator_set_current_limit(struct regulator *regulator,
3158 int min_uA, int max_uA)
3159{
3160 struct regulator_dev *rdev = regulator->rdev;
3161 int ret;
3162
3163 mutex_lock(&rdev->mutex);
3164
3165 /* sanity check */
3166 if (!rdev->desc->ops->set_current_limit) {
3167 ret = -EINVAL;
3168 goto out;
3169 }
3170
3171 /* constraints check */
3172 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3173 if (ret < 0)
3174 goto out;
3175
3176 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3177out:
3178 mutex_unlock(&rdev->mutex);
3179 return ret;
3180}
3181EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3182
3183static int _regulator_get_current_limit(struct regulator_dev *rdev)
3184{
3185 int ret;
3186
3187 mutex_lock(&rdev->mutex);
3188
3189 /* sanity check */
3190 if (!rdev->desc->ops->get_current_limit) {
3191 ret = -EINVAL;
3192 goto out;
3193 }
3194
3195 ret = rdev->desc->ops->get_current_limit(rdev);
3196out:
3197 mutex_unlock(&rdev->mutex);
3198 return ret;
3199}
3200
3201/**
3202 * regulator_get_current_limit - get regulator output current
3203 * @regulator: regulator source
3204 *
3205 * This returns the current supplied by the specified current sink in uA.
3206 *
3207 * NOTE: If the regulator is disabled it will return the current value. This
3208 * function should not be used to determine regulator state.
3209 */
3210int regulator_get_current_limit(struct regulator *regulator)
3211{
3212 return _regulator_get_current_limit(regulator->rdev);
3213}
3214EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3215
3216/**
3217 * regulator_set_mode - set regulator operating mode
3218 * @regulator: regulator source
3219 * @mode: operating mode - one of the REGULATOR_MODE constants
3220 *
3221 * Set regulator operating mode to increase regulator efficiency or improve
3222 * regulation performance.
3223 *
3224 * NOTE: Regulator system constraints must be set for this regulator before
3225 * calling this function otherwise this call will fail.
3226 */
3227int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3228{
3229 struct regulator_dev *rdev = regulator->rdev;
3230 int ret;
Sundar R Iyer500b4ac2010-05-17 21:24:48 +05303231 int regulator_curr_mode;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003232
3233 mutex_lock(&rdev->mutex);
3234
3235 /* sanity check */
3236 if (!rdev->desc->ops->set_mode) {
3237 ret = -EINVAL;
3238 goto out;
3239 }
3240
Sundar R Iyer500b4ac2010-05-17 21:24:48 +05303241 /* return if the same mode is requested */
3242 if (rdev->desc->ops->get_mode) {
3243 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3244 if (regulator_curr_mode == mode) {
3245 ret = 0;
3246 goto out;
3247 }
3248 }
3249
Liam Girdwood414c70c2008-04-30 15:59:04 +01003250 /* constraints check */
Axel Lin22c51b42011-04-01 18:25:25 +08003251 ret = regulator_mode_constrain(rdev, &mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003252 if (ret < 0)
3253 goto out;
3254
3255 ret = rdev->desc->ops->set_mode(rdev, mode);
3256out:
3257 mutex_unlock(&rdev->mutex);
3258 return ret;
3259}
3260EXPORT_SYMBOL_GPL(regulator_set_mode);
3261
3262static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3263{
3264 int ret;
3265
3266 mutex_lock(&rdev->mutex);
3267
3268 /* sanity check */
3269 if (!rdev->desc->ops->get_mode) {
3270 ret = -EINVAL;
3271 goto out;
3272 }
3273
3274 ret = rdev->desc->ops->get_mode(rdev);
3275out:
3276 mutex_unlock(&rdev->mutex);
3277 return ret;
3278}
3279
3280/**
3281 * regulator_get_mode - get regulator operating mode
3282 * @regulator: regulator source
3283 *
3284 * Get the current regulator operating mode.
3285 */
3286unsigned int regulator_get_mode(struct regulator *regulator)
3287{
3288 return _regulator_get_mode(regulator->rdev);
3289}
3290EXPORT_SYMBOL_GPL(regulator_get_mode);
3291
3292/**
Bjorn Anderssone39ce482015-02-11 19:35:27 -08003293 * regulator_set_load - set regulator load
Liam Girdwood414c70c2008-04-30 15:59:04 +01003294 * @regulator: regulator source
3295 * @uA_load: load current
3296 *
3297 * Notifies the regulator core of a new device load. This is then used by
3298 * DRMS (if enabled by constraints) to set the most efficient regulator
3299 * operating mode for the new regulator loading.
3300 *
3301 * Consumer devices notify their supply regulator of the maximum power
3302 * they will require (can be taken from device datasheet in the power
3303 * consumption tables) when they change operational status and hence power
3304 * state. Examples of operational state changes that can affect power
3305 * consumption are :-
3306 *
3307 * o Device is opened / closed.
3308 * o Device I/O is about to begin or has just finished.
3309 * o Device is idling in between work.
3310 *
3311 * This information is also exported via sysfs to userspace.
3312 *
3313 * DRMS will sum the total requested load on the regulator and change
3314 * to the most efficient operating mode if platform constraints allow.
3315 *
Bjorn Anderssone39ce482015-02-11 19:35:27 -08003316 * On error a negative errno is returned.
Liam Girdwood414c70c2008-04-30 15:59:04 +01003317 */
Bjorn Anderssone39ce482015-02-11 19:35:27 -08003318int regulator_set_load(struct regulator *regulator, int uA_load)
Liam Girdwood414c70c2008-04-30 15:59:04 +01003319{
3320 struct regulator_dev *rdev = regulator->rdev;
Bjorn Andersson8460ef32015-01-27 18:46:31 -08003321 int ret;
Stephen Boydd92d95b62012-07-02 19:21:06 -07003322
Liam Girdwood414c70c2008-04-30 15:59:04 +01003323 mutex_lock(&rdev->mutex);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003324 regulator->uA_load = uA_load;
Bjorn Andersson8460ef32015-01-27 18:46:31 -08003325 ret = drms_uA_update(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003326 mutex_unlock(&rdev->mutex);
Bjorn Andersson8460ef32015-01-27 18:46:31 -08003327
Liam Girdwood414c70c2008-04-30 15:59:04 +01003328 return ret;
3329}
Bjorn Anderssone39ce482015-02-11 19:35:27 -08003330EXPORT_SYMBOL_GPL(regulator_set_load);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003331
3332/**
Mark Brownf59c8f92012-08-31 10:36:37 -07003333 * regulator_allow_bypass - allow the regulator to go into bypass mode
3334 *
3335 * @regulator: Regulator to configure
Nishanth Menon9345dfb2013-02-28 18:44:54 -06003336 * @enable: enable or disable bypass mode
Mark Brownf59c8f92012-08-31 10:36:37 -07003337 *
3338 * Allow the regulator to go into bypass mode if all other consumers
3339 * for the regulator also enable bypass mode and the machine
3340 * constraints allow this. Bypass mode means that the regulator is
3341 * simply passing the input directly to the output with no regulation.
3342 */
3343int regulator_allow_bypass(struct regulator *regulator, bool enable)
3344{
3345 struct regulator_dev *rdev = regulator->rdev;
3346 int ret = 0;
3347
3348 if (!rdev->desc->ops->set_bypass)
3349 return 0;
3350
3351 if (rdev->constraints &&
3352 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3353 return 0;
3354
3355 mutex_lock(&rdev->mutex);
3356
3357 if (enable && !regulator->bypass) {
3358 rdev->bypass_count++;
3359
3360 if (rdev->bypass_count == rdev->open_count) {
3361 ret = rdev->desc->ops->set_bypass(rdev, enable);
3362 if (ret != 0)
3363 rdev->bypass_count--;
3364 }
3365
3366 } else if (!enable && regulator->bypass) {
3367 rdev->bypass_count--;
3368
3369 if (rdev->bypass_count != rdev->open_count) {
3370 ret = rdev->desc->ops->set_bypass(rdev, enable);
3371 if (ret != 0)
3372 rdev->bypass_count++;
3373 }
3374 }
3375
3376 if (ret == 0)
3377 regulator->bypass = enable;
3378
3379 mutex_unlock(&rdev->mutex);
3380
3381 return ret;
3382}
3383EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3384
3385/**
Liam Girdwood414c70c2008-04-30 15:59:04 +01003386 * regulator_register_notifier - register regulator event notifier
3387 * @regulator: regulator source
Mark Brown69279fb2008-12-31 12:52:41 +00003388 * @nb: notifier block
Liam Girdwood414c70c2008-04-30 15:59:04 +01003389 *
3390 * Register notifier block to receive regulator events.
3391 */
3392int regulator_register_notifier(struct regulator *regulator,
3393 struct notifier_block *nb)
3394{
3395 return blocking_notifier_chain_register(&regulator->rdev->notifier,
3396 nb);
3397}
3398EXPORT_SYMBOL_GPL(regulator_register_notifier);
3399
3400/**
3401 * regulator_unregister_notifier - unregister regulator event notifier
3402 * @regulator: regulator source
Mark Brown69279fb2008-12-31 12:52:41 +00003403 * @nb: notifier block
Liam Girdwood414c70c2008-04-30 15:59:04 +01003404 *
3405 * Unregister regulator event notifier block.
3406 */
3407int regulator_unregister_notifier(struct regulator *regulator,
3408 struct notifier_block *nb)
3409{
3410 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
3411 nb);
3412}
3413EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3414
Jonathan Cameronb136fb42009-01-19 18:20:58 +00003415/* notify regulator consumers and downstream regulator consumers.
3416 * Note mutex must be held by caller.
3417 */
Heiko Stübner71795692014-08-28 12:36:04 -07003418static int _notifier_call_chain(struct regulator_dev *rdev,
Liam Girdwood414c70c2008-04-30 15:59:04 +01003419 unsigned long event, void *data)
3420{
Liam Girdwood414c70c2008-04-30 15:59:04 +01003421 /* call rdev chain first */
Heiko Stübner71795692014-08-28 12:36:04 -07003422 return blocking_notifier_call_chain(&rdev->notifier, event, data);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003423}
3424
3425/**
3426 * regulator_bulk_get - get multiple regulator consumers
3427 *
3428 * @dev: Device to supply
3429 * @num_consumers: Number of consumers to register
3430 * @consumers: Configuration of consumers; clients are stored here.
3431 *
3432 * @return 0 on success, an errno on failure.
3433 *
3434 * This helper function allows drivers to get several regulator
3435 * consumers in one operation. If any of the regulators cannot be
3436 * acquired then any regulators that were allocated will be freed
3437 * before returning to the caller.
3438 */
3439int regulator_bulk_get(struct device *dev, int num_consumers,
3440 struct regulator_bulk_data *consumers)
3441{
3442 int i;
3443 int ret;
3444
3445 for (i = 0; i < num_consumers; i++)
3446 consumers[i].consumer = NULL;
3447
3448 for (i = 0; i < num_consumers; i++) {
Bjorn Andersson3ff3f512015-11-09 22:20:37 -08003449 consumers[i].consumer = _regulator_get(dev,
3450 consumers[i].supply,
3451 false,
3452 !consumers[i].optional);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003453 if (IS_ERR(consumers[i].consumer)) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01003454 ret = PTR_ERR(consumers[i].consumer);
Mark Brown5b307622009-10-13 13:06:49 +01003455 dev_err(dev, "Failed to get supply '%s': %d\n",
3456 consumers[i].supply, ret);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003457 consumers[i].consumer = NULL;
3458 goto err;
3459 }
3460 }
3461
3462 return 0;
3463
3464err:
Axel Linb29c7692012-02-20 10:32:16 +08003465 while (--i >= 0)
Liam Girdwood414c70c2008-04-30 15:59:04 +01003466 regulator_put(consumers[i].consumer);
3467
3468 return ret;
3469}
3470EXPORT_SYMBOL_GPL(regulator_bulk_get);
3471
Mark Brownf21e0e82011-05-24 08:12:40 +08003472static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3473{
3474 struct regulator_bulk_data *bulk = data;
3475
3476 bulk->ret = regulator_enable(bulk->consumer);
3477}
3478
Liam Girdwood414c70c2008-04-30 15:59:04 +01003479/**
3480 * regulator_bulk_enable - enable multiple regulator consumers
3481 *
3482 * @num_consumers: Number of consumers
3483 * @consumers: Consumer data; clients are stored here.
3484 * @return 0 on success, an errno on failure
3485 *
3486 * This convenience API allows consumers to enable multiple regulator
3487 * clients in a single API call. If any consumers cannot be enabled
3488 * then any others that were enabled will be disabled again prior to
3489 * return.
3490 */
3491int regulator_bulk_enable(int num_consumers,
3492 struct regulator_bulk_data *consumers)
3493{
Dan Williams2955b472012-07-09 19:33:25 -07003494 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003495 int i;
Mark Brownf21e0e82011-05-24 08:12:40 +08003496 int ret = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003497
Mark Brown6492bc12012-04-19 13:19:07 +01003498 for (i = 0; i < num_consumers; i++) {
3499 if (consumers[i].consumer->always_on)
3500 consumers[i].ret = 0;
3501 else
3502 async_schedule_domain(regulator_bulk_enable_async,
3503 &consumers[i], &async_domain);
3504 }
Mark Brownf21e0e82011-05-24 08:12:40 +08003505
3506 async_synchronize_full_domain(&async_domain);
3507
3508 /* If any consumer failed we need to unwind any that succeeded */
Liam Girdwood414c70c2008-04-30 15:59:04 +01003509 for (i = 0; i < num_consumers; i++) {
Mark Brownf21e0e82011-05-24 08:12:40 +08003510 if (consumers[i].ret != 0) {
3511 ret = consumers[i].ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003512 goto err;
Mark Brownf21e0e82011-05-24 08:12:40 +08003513 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01003514 }
3515
3516 return 0;
3517
3518err:
Andrzej Hajdafbe31052013-03-01 12:24:05 +01003519 for (i = 0; i < num_consumers; i++) {
3520 if (consumers[i].ret < 0)
3521 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3522 consumers[i].ret);
3523 else
3524 regulator_disable(consumers[i].consumer);
3525 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01003526
3527 return ret;
3528}
3529EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3530
3531/**
3532 * regulator_bulk_disable - disable multiple regulator consumers
3533 *
3534 * @num_consumers: Number of consumers
3535 * @consumers: Consumer data; clients are stored here.
3536 * @return 0 on success, an errno on failure
3537 *
3538 * This convenience API allows consumers to disable multiple regulator
Sylwester Nawrocki49e22632012-01-25 12:35:38 +01003539 * clients in a single API call. If any consumers cannot be disabled
3540 * then any others that were disabled will be enabled again prior to
Liam Girdwood414c70c2008-04-30 15:59:04 +01003541 * return.
3542 */
3543int regulator_bulk_disable(int num_consumers,
3544 struct regulator_bulk_data *consumers)
3545{
3546 int i;
Mark Brown01e86f42012-03-28 21:36:38 +01003547 int ret, r;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003548
Sylwester Nawrocki49e22632012-01-25 12:35:38 +01003549 for (i = num_consumers - 1; i >= 0; --i) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01003550 ret = regulator_disable(consumers[i].consumer);
3551 if (ret != 0)
3552 goto err;
3553 }
3554
3555 return 0;
3556
3557err:
Joe Perches5da84fd2010-11-30 05:53:48 -08003558 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
Mark Brown01e86f42012-03-28 21:36:38 +01003559 for (++i; i < num_consumers; ++i) {
3560 r = regulator_enable(consumers[i].consumer);
3561 if (r != 0)
3562 pr_err("Failed to reename %s: %d\n",
3563 consumers[i].supply, r);
3564 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01003565
3566 return ret;
3567}
3568EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3569
3570/**
Donggeun Kime1de2f42012-01-03 16:22:03 +09003571 * regulator_bulk_force_disable - force disable multiple regulator consumers
3572 *
3573 * @num_consumers: Number of consumers
3574 * @consumers: Consumer data; clients are stored here.
3575 * @return 0 on success, an errno on failure
3576 *
3577 * This convenience API allows consumers to forcibly disable multiple regulator
3578 * clients in a single API call.
3579 * NOTE: This should be used for situations when device damage will
3580 * likely occur if the regulators are not disabled (e.g. over temp).
3581 * Although regulator_force_disable function call for some consumers can
3582 * return error numbers, the function is called for all consumers.
3583 */
3584int regulator_bulk_force_disable(int num_consumers,
3585 struct regulator_bulk_data *consumers)
3586{
3587 int i;
3588 int ret;
3589
3590 for (i = 0; i < num_consumers; i++)
3591 consumers[i].ret =
3592 regulator_force_disable(consumers[i].consumer);
3593
3594 for (i = 0; i < num_consumers; i++) {
3595 if (consumers[i].ret != 0) {
3596 ret = consumers[i].ret;
3597 goto out;
3598 }
3599 }
3600
3601 return 0;
3602out:
3603 return ret;
3604}
3605EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3606
3607/**
Liam Girdwood414c70c2008-04-30 15:59:04 +01003608 * regulator_bulk_free - free multiple regulator consumers
3609 *
3610 * @num_consumers: Number of consumers
3611 * @consumers: Consumer data; clients are stored here.
3612 *
3613 * This convenience API allows consumers to free multiple regulator
3614 * clients in a single API call.
3615 */
3616void regulator_bulk_free(int num_consumers,
3617 struct regulator_bulk_data *consumers)
3618{
3619 int i;
3620
3621 for (i = 0; i < num_consumers; i++) {
3622 regulator_put(consumers[i].consumer);
3623 consumers[i].consumer = NULL;
3624 }
3625}
3626EXPORT_SYMBOL_GPL(regulator_bulk_free);
3627
3628/**
3629 * regulator_notifier_call_chain - call regulator event notifier
Mark Brown69279fb2008-12-31 12:52:41 +00003630 * @rdev: regulator source
Liam Girdwood414c70c2008-04-30 15:59:04 +01003631 * @event: notifier block
Mark Brown69279fb2008-12-31 12:52:41 +00003632 * @data: callback-specific data.
Liam Girdwood414c70c2008-04-30 15:59:04 +01003633 *
3634 * Called by regulator drivers to notify clients a regulator event has
3635 * occurred. We also notify regulator clients downstream.
Jonathan Cameronb136fb42009-01-19 18:20:58 +00003636 * Note lock must be held by caller.
Liam Girdwood414c70c2008-04-30 15:59:04 +01003637 */
3638int regulator_notifier_call_chain(struct regulator_dev *rdev,
3639 unsigned long event, void *data)
3640{
Krzysztof Kozlowski70cfef22015-06-29 09:04:43 +09003641 lockdep_assert_held_once(&rdev->mutex);
3642
Liam Girdwood414c70c2008-04-30 15:59:04 +01003643 _notifier_call_chain(rdev, event, data);
3644 return NOTIFY_DONE;
3645
3646}
3647EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3648
Mark Brownbe721972009-08-04 20:09:52 +02003649/**
3650 * regulator_mode_to_status - convert a regulator mode into a status
3651 *
3652 * @mode: Mode to convert
3653 *
3654 * Convert a regulator mode into a status.
3655 */
3656int regulator_mode_to_status(unsigned int mode)
3657{
3658 switch (mode) {
3659 case REGULATOR_MODE_FAST:
3660 return REGULATOR_STATUS_FAST;
3661 case REGULATOR_MODE_NORMAL:
3662 return REGULATOR_STATUS_NORMAL;
3663 case REGULATOR_MODE_IDLE:
3664 return REGULATOR_STATUS_IDLE;
Krystian Garbaciak03ffcf32012-07-12 11:50:38 +01003665 case REGULATOR_MODE_STANDBY:
Mark Brownbe721972009-08-04 20:09:52 +02003666 return REGULATOR_STATUS_STANDBY;
3667 default:
Krystian Garbaciak1beaf762012-07-12 13:53:35 +01003668 return REGULATOR_STATUS_UNDEFINED;
Mark Brownbe721972009-08-04 20:09:52 +02003669 }
3670}
3671EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3672
Takashi Iwai39f802d2015-01-30 20:29:31 +01003673static struct attribute *regulator_dev_attrs[] = {
3674 &dev_attr_name.attr,
3675 &dev_attr_num_users.attr,
3676 &dev_attr_type.attr,
3677 &dev_attr_microvolts.attr,
3678 &dev_attr_microamps.attr,
3679 &dev_attr_opmode.attr,
3680 &dev_attr_state.attr,
3681 &dev_attr_status.attr,
3682 &dev_attr_bypass.attr,
3683 &dev_attr_requested_microamps.attr,
3684 &dev_attr_min_microvolts.attr,
3685 &dev_attr_max_microvolts.attr,
3686 &dev_attr_min_microamps.attr,
3687 &dev_attr_max_microamps.attr,
3688 &dev_attr_suspend_standby_state.attr,
3689 &dev_attr_suspend_mem_state.attr,
3690 &dev_attr_suspend_disk_state.attr,
3691 &dev_attr_suspend_standby_microvolts.attr,
3692 &dev_attr_suspend_mem_microvolts.attr,
3693 &dev_attr_suspend_disk_microvolts.attr,
3694 &dev_attr_suspend_standby_mode.attr,
3695 &dev_attr_suspend_mem_mode.attr,
3696 &dev_attr_suspend_disk_mode.attr,
3697 NULL
3698};
3699
David Brownell7ad68e22008-11-11 17:39:02 -08003700/*
3701 * To avoid cluttering sysfs (and memory) with useless state, only
3702 * create attributes that can be meaningfully displayed.
3703 */
Takashi Iwai39f802d2015-01-30 20:29:31 +01003704static umode_t regulator_attr_is_visible(struct kobject *kobj,
3705 struct attribute *attr, int idx)
David Brownell7ad68e22008-11-11 17:39:02 -08003706{
Takashi Iwai39f802d2015-01-30 20:29:31 +01003707 struct device *dev = kobj_to_dev(kobj);
Geliang Tang83080a12016-01-05 22:07:55 +08003708 struct regulator_dev *rdev = dev_to_rdev(dev);
Guodong Xu272e2312014-08-13 19:33:38 +08003709 const struct regulator_ops *ops = rdev->desc->ops;
Takashi Iwai39f802d2015-01-30 20:29:31 +01003710 umode_t mode = attr->mode;
3711
3712 /* these three are always present */
3713 if (attr == &dev_attr_name.attr ||
3714 attr == &dev_attr_num_users.attr ||
3715 attr == &dev_attr_type.attr)
3716 return mode;
David Brownell7ad68e22008-11-11 17:39:02 -08003717
3718 /* some attributes need specific methods to be displayed */
Takashi Iwai39f802d2015-01-30 20:29:31 +01003719 if (attr == &dev_attr_microvolts.attr) {
3720 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3721 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3722 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3723 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3724 return mode;
3725 return 0;
Mark Brownf59c8f92012-08-31 10:36:37 -07003726 }
David Brownell7ad68e22008-11-11 17:39:02 -08003727
Takashi Iwai39f802d2015-01-30 20:29:31 +01003728 if (attr == &dev_attr_microamps.attr)
3729 return ops->get_current_limit ? mode : 0;
3730
3731 if (attr == &dev_attr_opmode.attr)
3732 return ops->get_mode ? mode : 0;
3733
3734 if (attr == &dev_attr_state.attr)
3735 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3736
3737 if (attr == &dev_attr_status.attr)
3738 return ops->get_status ? mode : 0;
3739
3740 if (attr == &dev_attr_bypass.attr)
3741 return ops->get_bypass ? mode : 0;
3742
David Brownell7ad68e22008-11-11 17:39:02 -08003743 /* some attributes are type-specific */
Takashi Iwai39f802d2015-01-30 20:29:31 +01003744 if (attr == &dev_attr_requested_microamps.attr)
3745 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
David Brownell7ad68e22008-11-11 17:39:02 -08003746
David Brownell7ad68e22008-11-11 17:39:02 -08003747 /* constraints need specific supporting methods */
Takashi Iwai39f802d2015-01-30 20:29:31 +01003748 if (attr == &dev_attr_min_microvolts.attr ||
3749 attr == &dev_attr_max_microvolts.attr)
3750 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
David Brownell7ad68e22008-11-11 17:39:02 -08003751
Takashi Iwai39f802d2015-01-30 20:29:31 +01003752 if (attr == &dev_attr_min_microamps.attr ||
3753 attr == &dev_attr_max_microamps.attr)
3754 return ops->set_current_limit ? mode : 0;
David Brownell7ad68e22008-11-11 17:39:02 -08003755
Takashi Iwai39f802d2015-01-30 20:29:31 +01003756 if (attr == &dev_attr_suspend_standby_state.attr ||
3757 attr == &dev_attr_suspend_mem_state.attr ||
3758 attr == &dev_attr_suspend_disk_state.attr)
3759 return mode;
David Brownell7ad68e22008-11-11 17:39:02 -08003760
Takashi Iwai39f802d2015-01-30 20:29:31 +01003761 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3762 attr == &dev_attr_suspend_mem_microvolts.attr ||
3763 attr == &dev_attr_suspend_disk_microvolts.attr)
3764 return ops->set_suspend_voltage ? mode : 0;
David Brownell7ad68e22008-11-11 17:39:02 -08003765
Takashi Iwai39f802d2015-01-30 20:29:31 +01003766 if (attr == &dev_attr_suspend_standby_mode.attr ||
3767 attr == &dev_attr_suspend_mem_mode.attr ||
3768 attr == &dev_attr_suspend_disk_mode.attr)
3769 return ops->set_suspend_mode ? mode : 0;
3770
3771 return mode;
David Brownell7ad68e22008-11-11 17:39:02 -08003772}
3773
Takashi Iwai39f802d2015-01-30 20:29:31 +01003774static const struct attribute_group regulator_dev_group = {
3775 .attrs = regulator_dev_attrs,
3776 .is_visible = regulator_attr_is_visible,
3777};
3778
3779static const struct attribute_group *regulator_dev_groups[] = {
3780 &regulator_dev_group,
3781 NULL
3782};
3783
3784static void regulator_dev_release(struct device *dev)
3785{
3786 struct regulator_dev *rdev = dev_get_drvdata(dev);
Mark Brown29f5f482015-08-07 20:01:32 +01003787
3788 kfree(rdev->constraints);
3789 of_node_put(rdev->dev.of_node);
Takashi Iwai39f802d2015-01-30 20:29:31 +01003790 kfree(rdev);
3791}
3792
3793static struct class regulator_class = {
3794 .name = "regulator",
3795 .dev_release = regulator_dev_release,
3796 .dev_groups = regulator_dev_groups,
3797};
3798
Mark Brown1130e5b2010-12-21 23:49:31 +00003799static void rdev_init_debugfs(struct regulator_dev *rdev)
3800{
Guenter Roecka9eaa812014-10-17 08:17:03 -07003801 struct device *parent = rdev->dev.parent;
3802 const char *rname = rdev_get_name(rdev);
3803 char name[NAME_MAX];
3804
3805 /* Avoid duplicate debugfs directory names */
3806 if (parent && rname == rdev->desc->name) {
3807 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3808 rname);
3809 rname = name;
3810 }
3811
3812 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
Stephen Boyd24751432012-02-20 22:50:42 -08003813 if (!rdev->debugfs) {
Mark Brown1130e5b2010-12-21 23:49:31 +00003814 rdev_warn(rdev, "Failed to create debugfs directory\n");
Mark Brown1130e5b2010-12-21 23:49:31 +00003815 return;
3816 }
3817
3818 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3819 &rdev->use_count);
3820 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3821 &rdev->open_count);
Mark Brownf59c8f92012-08-31 10:36:37 -07003822 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3823 &rdev->bypass_count);
Mark Brown1130e5b2010-12-21 23:49:31 +00003824}
3825
Liam Girdwood414c70c2008-04-30 15:59:04 +01003826/**
3827 * regulator_register - register regulator
Mark Brown69279fb2008-12-31 12:52:41 +00003828 * @regulator_desc: regulator to register
Krzysztof Kozlowskif47531b2015-01-12 09:01:39 +01003829 * @cfg: runtime configuration for regulator
Liam Girdwood414c70c2008-04-30 15:59:04 +01003830 *
3831 * Called by regulator drivers to register a regulator.
Axel Lin03846182013-01-03 21:01:47 +08003832 * Returns a valid pointer to struct regulator_dev on success
3833 * or an ERR_PTR() on error.
Liam Girdwood414c70c2008-04-30 15:59:04 +01003834 */
Mark Brown65f26842012-04-03 20:46:53 +01003835struct regulator_dev *
3836regulator_register(const struct regulator_desc *regulator_desc,
Krzysztof Kozlowski1b3de222015-01-05 12:48:41 +01003837 const struct regulator_config *cfg)
Liam Girdwood414c70c2008-04-30 15:59:04 +01003838{
Mark Brown9a8f5e02011-11-29 18:11:19 +00003839 const struct regulation_constraints *constraints = NULL;
Mark Brownc1727082012-04-04 00:50:22 +01003840 const struct regulator_init_data *init_data;
Krzysztof Kozlowski1b3de222015-01-05 12:48:41 +01003841 struct regulator_config *config = NULL;
Aniroop Mathur72dca062014-12-28 22:08:38 +05303842 static atomic_t regulator_no = ATOMIC_INIT(-1);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003843 struct regulator_dev *rdev;
Mark Brown32c8fad2012-04-11 10:19:12 +01003844 struct device *dev;
Liam Girdwooda5766f12008-10-10 13:22:20 +01003845 int ret, i;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003846
Krzysztof Kozlowski1b3de222015-01-05 12:48:41 +01003847 if (regulator_desc == NULL || cfg == NULL)
Liam Girdwood414c70c2008-04-30 15:59:04 +01003848 return ERR_PTR(-EINVAL);
3849
Krzysztof Kozlowski1b3de222015-01-05 12:48:41 +01003850 dev = cfg->dev;
Mark Browndcf70112012-05-08 18:09:12 +01003851 WARN_ON(!dev);
Mark Brown32c8fad2012-04-11 10:19:12 +01003852
Liam Girdwood414c70c2008-04-30 15:59:04 +01003853 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3854 return ERR_PTR(-EINVAL);
3855
Diego Lizierocd78dfc2009-04-14 03:04:47 +02003856 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3857 regulator_desc->type != REGULATOR_CURRENT)
Liam Girdwood414c70c2008-04-30 15:59:04 +01003858 return ERR_PTR(-EINVAL);
3859
Mark Brown476c2d82010-12-10 17:28:07 +00003860 /* Only one of each should be implemented */
3861 WARN_ON(regulator_desc->ops->get_voltage &&
3862 regulator_desc->ops->get_voltage_sel);
Mark Browne8eef822010-12-12 14:36:17 +00003863 WARN_ON(regulator_desc->ops->set_voltage &&
3864 regulator_desc->ops->set_voltage_sel);
Mark Brown476c2d82010-12-10 17:28:07 +00003865
3866 /* If we're using selectors we must implement list_voltage. */
3867 if (regulator_desc->ops->get_voltage_sel &&
3868 !regulator_desc->ops->list_voltage) {
3869 return ERR_PTR(-EINVAL);
3870 }
Mark Browne8eef822010-12-12 14:36:17 +00003871 if (regulator_desc->ops->set_voltage_sel &&
3872 !regulator_desc->ops->list_voltage) {
3873 return ERR_PTR(-EINVAL);
3874 }
Mark Brown476c2d82010-12-10 17:28:07 +00003875
Liam Girdwood414c70c2008-04-30 15:59:04 +01003876 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3877 if (rdev == NULL)
3878 return ERR_PTR(-ENOMEM);
3879
Krzysztof Kozlowski1b3de222015-01-05 12:48:41 +01003880 /*
3881 * Duplicate the config so the driver could override it after
3882 * parsing init data.
3883 */
3884 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
3885 if (config == NULL) {
3886 kfree(rdev);
3887 return ERR_PTR(-ENOMEM);
3888 }
3889
Krzysztof Kozlowskibfa21a02015-01-05 12:48:42 +01003890 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
Mark Browna0c7b162014-09-09 23:13:57 +01003891 &rdev->dev.of_node);
3892 if (!init_data) {
3893 init_data = config->init_data;
3894 rdev->dev.of_node = of_node_get(config->of_node);
3895 }
3896
Liam Girdwood414c70c2008-04-30 15:59:04 +01003897 mutex_lock(&regulator_list_mutex);
3898
3899 mutex_init(&rdev->mutex);
Mark Brownc1727082012-04-04 00:50:22 +01003900 rdev->reg_data = config->driver_data;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003901 rdev->owner = regulator_desc->owner;
3902 rdev->desc = regulator_desc;
Mark Brown3a4b0a02012-05-08 18:10:45 +01003903 if (config->regmap)
3904 rdev->regmap = config->regmap;
AnilKumar Ch52b84da2012-09-07 20:45:05 +05303905 else if (dev_get_regmap(dev, NULL))
Mark Brown3a4b0a02012-05-08 18:10:45 +01003906 rdev->regmap = dev_get_regmap(dev, NULL);
AnilKumar Ch52b84da2012-09-07 20:45:05 +05303907 else if (dev->parent)
3908 rdev->regmap = dev_get_regmap(dev->parent, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003909 INIT_LIST_HEAD(&rdev->consumer_list);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003910 INIT_LIST_HEAD(&rdev->list);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003911 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
Mark Brownda07ecd2011-09-11 09:53:50 +01003912 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003913
Liam Girdwooda5766f12008-10-10 13:22:20 +01003914 /* preform any regulator specific init */
Mark Brown9a8f5e02011-11-29 18:11:19 +00003915 if (init_data && init_data->regulator_init) {
Liam Girdwooda5766f12008-10-10 13:22:20 +01003916 ret = init_data->regulator_init(rdev->reg_data);
David Brownell4fca9542008-11-11 17:38:53 -08003917 if (ret < 0)
3918 goto clean;
Liam Girdwooda5766f12008-10-10 13:22:20 +01003919 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01003920
Liam Girdwooda5766f12008-10-10 13:22:20 +01003921 /* register with sysfs */
3922 rdev->dev.class = &regulator_class;
3923 rdev->dev.parent = dev;
Aniroop Mathur72dca062014-12-28 22:08:38 +05303924 dev_set_name(&rdev->dev, "regulator.%lu",
Aniroop Mathur39138812014-12-29 22:36:48 +05303925 (unsigned long) atomic_inc_return(&regulator_no));
Liam Girdwooda5766f12008-10-10 13:22:20 +01003926 ret = device_register(&rdev->dev);
Vasiliy Kulikovad7725c2010-09-19 16:55:01 +04003927 if (ret != 0) {
3928 put_device(&rdev->dev);
David Brownell4fca9542008-11-11 17:38:53 -08003929 goto clean;
Vasiliy Kulikovad7725c2010-09-19 16:55:01 +04003930 }
Liam Girdwooda5766f12008-10-10 13:22:20 +01003931
3932 dev_set_drvdata(&rdev->dev, rdev);
3933
Markus Pargmann76f439d2014-10-08 15:47:05 +02003934 if ((config->ena_gpio || config->ena_gpio_initialized) &&
3935 gpio_is_valid(config->ena_gpio)) {
Kim, Milof19b00d2013-02-18 06:50:39 +00003936 ret = regulator_ena_gpio_request(rdev, config);
Mark Brown65f73502012-06-27 14:14:38 +01003937 if (ret != 0) {
3938 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3939 config->ena_gpio, ret);
Andrew Lunnb2da55d2012-10-28 16:01:11 +01003940 goto wash;
Mark Brown65f73502012-06-27 14:14:38 +01003941 }
Mark Brown65f73502012-06-27 14:14:38 +01003942 }
3943
Mike Rapoport74f544c2008-11-25 14:53:53 +02003944 /* set regulator constraints */
Mark Brown9a8f5e02011-11-29 18:11:19 +00003945 if (init_data)
3946 constraints = &init_data->constraints;
3947
3948 ret = set_machine_constraints(rdev, constraints);
Mike Rapoport74f544c2008-11-25 14:53:53 +02003949 if (ret < 0)
3950 goto scrub;
3951
Mark Brown9a8f5e02011-11-29 18:11:19 +00003952 if (init_data && init_data->supply_regulator)
Bjorn Andersson6261b062015-03-24 18:56:05 -07003953 rdev->supply_name = init_data->supply_regulator;
Rajendra Nayak69511a42011-11-18 16:47:20 +05303954 else if (regulator_desc->supply_name)
Bjorn Andersson6261b062015-03-24 18:56:05 -07003955 rdev->supply_name = regulator_desc->supply_name;
Rajendra Nayak69511a42011-11-18 16:47:20 +05303956
Liam Girdwooda5766f12008-10-10 13:22:20 +01003957 /* add consumers devices */
Mark Brown9a8f5e02011-11-29 18:11:19 +00003958 if (init_data) {
3959 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3960 ret = set_consumer_device_supply(rdev,
Mark Brown9a8f5e02011-11-29 18:11:19 +00003961 init_data->consumer_supplies[i].dev_name,
Mark Brown23c2f042011-02-24 17:39:09 +00003962 init_data->consumer_supplies[i].supply);
Mark Brown9a8f5e02011-11-29 18:11:19 +00003963 if (ret < 0) {
3964 dev_err(dev, "Failed to set supply %s\n",
3965 init_data->consumer_supplies[i].supply);
3966 goto unset_supplies;
3967 }
Mark Brown23c2f042011-02-24 17:39:09 +00003968 }
Liam Girdwooda5766f12008-10-10 13:22:20 +01003969 }
3970
Mark Brown1130e5b2010-12-21 23:49:31 +00003971 rdev_init_debugfs(rdev);
Liam Girdwooda5766f12008-10-10 13:22:20 +01003972out:
Liam Girdwood414c70c2008-04-30 15:59:04 +01003973 mutex_unlock(&regulator_list_mutex);
Krzysztof Kozlowski1b3de222015-01-05 12:48:41 +01003974 kfree(config);
Liam Girdwood414c70c2008-04-30 15:59:04 +01003975 return rdev;
David Brownell4fca9542008-11-11 17:38:53 -08003976
Jani Nikulad4033b52010-04-29 10:55:11 +03003977unset_supplies:
3978 unset_regulator_supplies(rdev);
3979
David Brownell4fca9542008-11-11 17:38:53 -08003980scrub:
Kim, Milof19b00d2013-02-18 06:50:39 +00003981 regulator_ena_gpio_free(rdev);
Axel Lin1a6958e72011-07-15 10:50:43 +08003982 kfree(rdev->constraints);
Andrew Lunnb2da55d2012-10-28 16:01:11 +01003983wash:
David Brownell4fca9542008-11-11 17:38:53 -08003984 device_unregister(&rdev->dev);
Paul Walmsley53032da2009-04-25 05:28:36 -06003985 /* device core frees rdev */
3986 rdev = ERR_PTR(ret);
3987 goto out;
3988
David Brownell4fca9542008-11-11 17:38:53 -08003989clean:
3990 kfree(rdev);
3991 rdev = ERR_PTR(ret);
3992 goto out;
Liam Girdwood414c70c2008-04-30 15:59:04 +01003993}
3994EXPORT_SYMBOL_GPL(regulator_register);
3995
3996/**
3997 * regulator_unregister - unregister regulator
Mark Brown69279fb2008-12-31 12:52:41 +00003998 * @rdev: regulator to unregister
Liam Girdwood414c70c2008-04-30 15:59:04 +01003999 *
4000 * Called by regulator drivers to unregister a regulator.
4001 */
4002void regulator_unregister(struct regulator_dev *rdev)
4003{
4004 if (rdev == NULL)
4005 return;
4006
Mark Brown891636e2013-07-08 09:14:45 +01004007 if (rdev->supply) {
4008 while (rdev->use_count--)
4009 regulator_disable(rdev->supply);
Mark Browne032b372012-03-28 21:17:55 +01004010 regulator_put(rdev->supply);
Mark Brown891636e2013-07-08 09:14:45 +01004011 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01004012 mutex_lock(&regulator_list_mutex);
Mark Brown1130e5b2010-12-21 23:49:31 +00004013 debugfs_remove_recursive(rdev->debugfs);
Tejun Heo43829732012-08-20 14:51:24 -07004014 flush_work(&rdev->disable_work.work);
Mark Brown6bf87d12009-07-21 16:00:25 +01004015 WARN_ON(rdev->open_count);
Mike Rapoport0f1d7472009-01-22 16:00:29 +02004016 unset_regulator_supplies(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01004017 list_del(&rdev->list);
Mark Brown7cd71c32015-08-07 13:00:35 +01004018 mutex_unlock(&regulator_list_mutex);
Kim, Milof19b00d2013-02-18 06:50:39 +00004019 regulator_ena_gpio_free(rdev);
Lothar Waßmann58fb5cf2011-11-28 15:38:37 +01004020 device_unregister(&rdev->dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01004021}
4022EXPORT_SYMBOL_GPL(regulator_unregister);
4023
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02004024static int _regulator_suspend_prepare(struct device *dev, void *data)
4025{
4026 struct regulator_dev *rdev = dev_to_rdev(dev);
4027 const suspend_state_t *state = data;
4028 int ret;
4029
4030 mutex_lock(&rdev->mutex);
4031 ret = suspend_prepare(rdev, *state);
4032 mutex_unlock(&rdev->mutex);
4033
4034 return ret;
4035}
4036
Liam Girdwood414c70c2008-04-30 15:59:04 +01004037/**
Mark Browncf7bbcd2008-12-31 12:52:43 +00004038 * regulator_suspend_prepare - prepare regulators for system wide suspend
Liam Girdwood414c70c2008-04-30 15:59:04 +01004039 * @state: system suspend state
4040 *
4041 * Configure each regulator with it's suspend operating parameters for state.
4042 * This will usually be called by machine suspend code prior to supending.
4043 */
4044int regulator_suspend_prepare(suspend_state_t state)
4045{
Liam Girdwood414c70c2008-04-30 15:59:04 +01004046 /* ON is handled by regulator active state */
4047 if (state == PM_SUSPEND_ON)
4048 return -EINVAL;
4049
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02004050 return class_for_each_device(&regulator_class, NULL, &state,
4051 _regulator_suspend_prepare);
Liam Girdwood414c70c2008-04-30 15:59:04 +01004052}
4053EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
4054
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02004055static int _regulator_suspend_finish(struct device *dev, void *data)
4056{
4057 struct regulator_dev *rdev = dev_to_rdev(dev);
4058 int ret;
4059
4060 mutex_lock(&rdev->mutex);
4061 if (rdev->use_count > 0 || rdev->constraints->always_on) {
4062 if (!_regulator_is_enabled(rdev)) {
4063 ret = _regulator_do_enable(rdev);
4064 if (ret)
4065 dev_err(dev,
4066 "Failed to resume regulator %d\n",
4067 ret);
4068 }
4069 } else {
4070 if (!have_full_constraints())
4071 goto unlock;
4072 if (!_regulator_is_enabled(rdev))
4073 goto unlock;
4074
4075 ret = _regulator_do_disable(rdev);
4076 if (ret)
4077 dev_err(dev, "Failed to suspend regulator %d\n", ret);
4078 }
4079unlock:
4080 mutex_unlock(&rdev->mutex);
4081
4082 /* Keep processing regulators in spite of any errors */
4083 return 0;
4084}
4085
Liam Girdwood414c70c2008-04-30 15:59:04 +01004086/**
MyungJoo Ham7a32b582011-03-11 10:13:59 +09004087 * regulator_suspend_finish - resume regulators from system wide suspend
4088 *
4089 * Turn on regulators that might be turned off by regulator_suspend_prepare
4090 * and that should be turned on according to the regulators properties.
4091 */
4092int regulator_suspend_finish(void)
4093{
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02004094 return class_for_each_device(&regulator_class, NULL, NULL,
4095 _regulator_suspend_finish);
MyungJoo Ham7a32b582011-03-11 10:13:59 +09004096}
4097EXPORT_SYMBOL_GPL(regulator_suspend_finish);
4098
4099/**
Mark Brownca725562009-03-16 19:36:34 +00004100 * regulator_has_full_constraints - the system has fully specified constraints
4101 *
4102 * Calling this function will cause the regulator API to disable all
4103 * regulators which have a zero use count and don't have an always_on
4104 * constraint in a late_initcall.
4105 *
4106 * The intention is that this will become the default behaviour in a
4107 * future kernel release so users are encouraged to use this facility
4108 * now.
4109 */
4110void regulator_has_full_constraints(void)
4111{
4112 has_full_constraints = 1;
4113}
4114EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4115
4116/**
Liam Girdwood414c70c2008-04-30 15:59:04 +01004117 * rdev_get_drvdata - get rdev regulator driver data
Mark Brown69279fb2008-12-31 12:52:41 +00004118 * @rdev: regulator
Liam Girdwood414c70c2008-04-30 15:59:04 +01004119 *
4120 * Get rdev regulator driver private data. This call can be used in the
4121 * regulator driver context.
4122 */
4123void *rdev_get_drvdata(struct regulator_dev *rdev)
4124{
4125 return rdev->reg_data;
4126}
4127EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4128
4129/**
4130 * regulator_get_drvdata - get regulator driver data
4131 * @regulator: regulator
4132 *
4133 * Get regulator driver private data. This call can be used in the consumer
4134 * driver context when non API regulator specific functions need to be called.
4135 */
4136void *regulator_get_drvdata(struct regulator *regulator)
4137{
4138 return regulator->rdev->reg_data;
4139}
4140EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4141
4142/**
4143 * regulator_set_drvdata - set regulator driver data
4144 * @regulator: regulator
4145 * @data: data
4146 */
4147void regulator_set_drvdata(struct regulator *regulator, void *data)
4148{
4149 regulator->rdev->reg_data = data;
4150}
4151EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4152
4153/**
4154 * regulator_get_id - get regulator ID
Mark Brown69279fb2008-12-31 12:52:41 +00004155 * @rdev: regulator
Liam Girdwood414c70c2008-04-30 15:59:04 +01004156 */
4157int rdev_get_id(struct regulator_dev *rdev)
4158{
4159 return rdev->desc->id;
4160}
4161EXPORT_SYMBOL_GPL(rdev_get_id);
4162
Liam Girdwooda5766f12008-10-10 13:22:20 +01004163struct device *rdev_get_dev(struct regulator_dev *rdev)
4164{
4165 return &rdev->dev;
4166}
4167EXPORT_SYMBOL_GPL(rdev_get_dev);
4168
4169void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4170{
4171 return reg_init_data->driver_data;
4172}
4173EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4174
Mark Brownba55a972011-08-23 17:39:10 +01004175#ifdef CONFIG_DEBUG_FS
4176static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
4177 size_t count, loff_t *ppos)
4178{
4179 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
4180 ssize_t len, ret = 0;
4181 struct regulator_map *map;
4182
4183 if (!buf)
4184 return -ENOMEM;
4185
4186 list_for_each_entry(map, &regulator_map_list, list) {
4187 len = snprintf(buf + ret, PAGE_SIZE - ret,
4188 "%s -> %s.%s\n",
4189 rdev_get_name(map->regulator), map->dev_name,
4190 map->supply);
4191 if (len >= 0)
4192 ret += len;
4193 if (ret > PAGE_SIZE) {
4194 ret = PAGE_SIZE;
4195 break;
4196 }
4197 }
4198
4199 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
4200
4201 kfree(buf);
4202
4203 return ret;
4204}
Stephen Boyd24751432012-02-20 22:50:42 -08004205#endif
Mark Brownba55a972011-08-23 17:39:10 +01004206
4207static const struct file_operations supply_map_fops = {
Stephen Boyd24751432012-02-20 22:50:42 -08004208#ifdef CONFIG_DEBUG_FS
Mark Brownba55a972011-08-23 17:39:10 +01004209 .read = supply_map_read_file,
4210 .llseek = default_llseek,
Mark Brownba55a972011-08-23 17:39:10 +01004211#endif
Stephen Boyd24751432012-02-20 22:50:42 -08004212};
Mark Brownba55a972011-08-23 17:39:10 +01004213
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004214#ifdef CONFIG_DEBUG_FS
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02004215struct summary_data {
4216 struct seq_file *s;
4217 struct regulator_dev *parent;
4218 int level;
4219};
4220
4221static void regulator_summary_show_subtree(struct seq_file *s,
4222 struct regulator_dev *rdev,
4223 int level);
4224
4225static int regulator_summary_show_children(struct device *dev, void *data)
4226{
4227 struct regulator_dev *rdev = dev_to_rdev(dev);
4228 struct summary_data *summary_data = data;
4229
4230 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
4231 regulator_summary_show_subtree(summary_data->s, rdev,
4232 summary_data->level + 1);
4233
4234 return 0;
4235}
4236
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004237static void regulator_summary_show_subtree(struct seq_file *s,
4238 struct regulator_dev *rdev,
4239 int level)
4240{
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004241 struct regulation_constraints *c;
4242 struct regulator *consumer;
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02004243 struct summary_data summary_data;
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004244
4245 if (!rdev)
4246 return;
4247
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004248 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4249 level * 3 + 1, "",
4250 30 - level * 3, rdev_get_name(rdev),
4251 rdev->use_count, rdev->open_count, rdev->bypass_count);
4252
Heiko Stübner23296092015-04-10 13:48:41 +02004253 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4254 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004255
4256 c = rdev->constraints;
4257 if (c) {
4258 switch (rdev->desc->type) {
4259 case REGULATOR_VOLTAGE:
4260 seq_printf(s, "%5dmV %5dmV ",
4261 c->min_uV / 1000, c->max_uV / 1000);
4262 break;
4263 case REGULATOR_CURRENT:
4264 seq_printf(s, "%5dmA %5dmA ",
4265 c->min_uA / 1000, c->max_uA / 1000);
4266 break;
4267 }
4268 }
4269
4270 seq_puts(s, "\n");
4271
4272 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4273 if (consumer->dev->class == &regulator_class)
4274 continue;
4275
4276 seq_printf(s, "%*s%-*s ",
4277 (level + 1) * 3 + 1, "",
4278 30 - (level + 1) * 3, dev_name(consumer->dev));
4279
4280 switch (rdev->desc->type) {
4281 case REGULATOR_VOLTAGE:
Heiko Stübner23296092015-04-10 13:48:41 +02004282 seq_printf(s, "%37dmV %5dmV",
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004283 consumer->min_uV / 1000,
4284 consumer->max_uV / 1000);
4285 break;
4286 case REGULATOR_CURRENT:
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004287 break;
4288 }
4289
4290 seq_puts(s, "\n");
4291 }
4292
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02004293 summary_data.s = s;
4294 summary_data.level = level;
4295 summary_data.parent = rdev;
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004296
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02004297 class_for_each_device(&regulator_class, NULL, &summary_data,
4298 regulator_summary_show_children);
4299}
4300
4301static int regulator_summary_show_roots(struct device *dev, void *data)
4302{
4303 struct regulator_dev *rdev = dev_to_rdev(dev);
4304 struct seq_file *s = data;
4305
4306 if (!rdev->supply)
4307 regulator_summary_show_subtree(s, rdev, 0);
4308
4309 return 0;
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004310}
4311
4312static int regulator_summary_show(struct seq_file *s, void *data)
4313{
Heiko Stübner23296092015-04-10 13:48:41 +02004314 seq_puts(s, " regulator use open bypass voltage current min max\n");
4315 seq_puts(s, "-------------------------------------------------------------------------------\n");
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004316
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02004317 class_for_each_device(&regulator_class, NULL, s,
4318 regulator_summary_show_roots);
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004319
4320 return 0;
4321}
4322
4323static int regulator_summary_open(struct inode *inode, struct file *file)
4324{
4325 return single_open(file, regulator_summary_show, inode->i_private);
4326}
4327#endif
4328
4329static const struct file_operations regulator_summary_fops = {
4330#ifdef CONFIG_DEBUG_FS
4331 .open = regulator_summary_open,
4332 .read = seq_read,
4333 .llseek = seq_lseek,
4334 .release = single_release,
4335#endif
4336};
4337
Liam Girdwood414c70c2008-04-30 15:59:04 +01004338static int __init regulator_init(void)
4339{
Mark Brown34abbd62010-02-12 10:18:08 +00004340 int ret;
4341
Mark Brown34abbd62010-02-12 10:18:08 +00004342 ret = class_register(&regulator_class);
4343
Mark Brown1130e5b2010-12-21 23:49:31 +00004344 debugfs_root = debugfs_create_dir("regulator", NULL);
Stephen Boyd24751432012-02-20 22:50:42 -08004345 if (!debugfs_root)
Mark Brown1130e5b2010-12-21 23:49:31 +00004346 pr_warn("regulator: Failed to create debugfs directory\n");
Mark Brownba55a972011-08-23 17:39:10 +01004347
Mark Brownf4d562c2012-02-20 21:01:04 +00004348 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4349 &supply_map_fops);
Mark Brown1130e5b2010-12-21 23:49:31 +00004350
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004351 debugfs_create_file("regulator_summary", 0444, debugfs_root,
Tomeu Vizoso85f3b432015-09-21 16:02:47 +02004352 NULL, &regulator_summary_fops);
Heiko Stübner7c225ec2015-04-07 16:16:39 +02004353
Mark Brown34abbd62010-02-12 10:18:08 +00004354 regulator_dummy_init();
4355
4356 return ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01004357}
4358
4359/* init early to allow our consumers to complete system booting */
4360core_initcall(regulator_init);
Mark Brownca725562009-03-16 19:36:34 +00004361
Mark Brown609ca5f2015-08-10 19:43:47 +01004362static int __init regulator_late_cleanup(struct device *dev, void *data)
Mark Brownca725562009-03-16 19:36:34 +00004363{
Mark Brown609ca5f2015-08-10 19:43:47 +01004364 struct regulator_dev *rdev = dev_to_rdev(dev);
4365 const struct regulator_ops *ops = rdev->desc->ops;
4366 struct regulation_constraints *c = rdev->constraints;
Mark Brownca725562009-03-16 19:36:34 +00004367 int enabled, ret;
Mark Brownca725562009-03-16 19:36:34 +00004368
Mark Brown609ca5f2015-08-10 19:43:47 +01004369 if (c && c->always_on)
4370 return 0;
4371
4372 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
4373 return 0;
4374
4375 mutex_lock(&rdev->mutex);
4376
4377 if (rdev->use_count)
4378 goto unlock;
4379
4380 /* If we can't read the status assume it's on. */
4381 if (ops->is_enabled)
4382 enabled = ops->is_enabled(rdev);
4383 else
4384 enabled = 1;
4385
4386 if (!enabled)
4387 goto unlock;
4388
4389 if (have_full_constraints()) {
4390 /* We log since this may kill the system if it goes
4391 * wrong. */
4392 rdev_info(rdev, "disabling\n");
4393 ret = _regulator_do_disable(rdev);
4394 if (ret != 0)
4395 rdev_err(rdev, "couldn't disable: %d\n", ret);
4396 } else {
4397 /* The intention is that in future we will
4398 * assume that full constraints are provided
4399 * so warn even if we aren't going to do
4400 * anything here.
4401 */
4402 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4403 }
4404
4405unlock:
4406 mutex_unlock(&rdev->mutex);
4407
4408 return 0;
4409}
4410
4411static int __init regulator_init_complete(void)
4412{
Mark Brown86f5fcf2012-07-06 18:19:13 +01004413 /*
4414 * Since DT doesn't provide an idiomatic mechanism for
4415 * enabling full constraints and since it's much more natural
4416 * with DT to provide them just assume that a DT enabled
4417 * system has full constraints.
4418 */
4419 if (of_have_populated_dt())
4420 has_full_constraints = true;
4421
Mark Brownca725562009-03-16 19:36:34 +00004422 /* If we have a full configuration then disable any regulators
Mark Browne9535832014-06-01 19:15:16 +01004423 * we have permission to change the status for and which are
4424 * not in use or always_on. This is effectively the default
4425 * for DT and ACPI as they have full constraints.
Mark Brownca725562009-03-16 19:36:34 +00004426 */
Mark Brown609ca5f2015-08-10 19:43:47 +01004427 class_for_each_device(&regulator_class, NULL, NULL,
4428 regulator_late_cleanup);
Mark Brownca725562009-03-16 19:36:34 +00004429
4430 return 0;
4431}
Saravana Kannanfd482a32014-04-23 18:10:50 -05004432late_initcall_sync(regulator_init_complete);