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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>
18#include <linux/device.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Liam Girdwood414c70c2008-04-30 15:59:04 +010020#include <linux/err.h>
21#include <linux/mutex.h>
22#include <linux/suspend.h>
Mark Brown31aae2b2009-12-21 12:21:52 +000023#include <linux/delay.h>
Liam Girdwood414c70c2008-04-30 15:59:04 +010024#include <linux/regulator/consumer.h>
25#include <linux/regulator/driver.h>
26#include <linux/regulator/machine.h>
27
Mark Brown34abbd62010-02-12 10:18:08 +000028#include "dummy.h"
29
Liam Girdwood414c70c2008-04-30 15:59:04 +010030#define REGULATOR_VERSION "0.5"
31
32static DEFINE_MUTEX(regulator_list_mutex);
33static LIST_HEAD(regulator_list);
34static LIST_HEAD(regulator_map_list);
Mark Brownca725562009-03-16 19:36:34 +000035static int has_full_constraints;
Liam Girdwood414c70c2008-04-30 15:59:04 +010036
Mark Brown8dc53902008-12-31 12:52:40 +000037/*
Liam Girdwood414c70c2008-04-30 15:59:04 +010038 * struct regulator_map
39 *
40 * Used to provide symbolic supply names to devices.
41 */
42struct regulator_map {
43 struct list_head list;
Mark Brown40f92442009-06-17 17:56:39 +010044 const char *dev_name; /* The dev_name() for the consumer */
Liam Girdwood414c70c2008-04-30 15:59:04 +010045 const char *supply;
Liam Girdwooda5766f12008-10-10 13:22:20 +010046 struct regulator_dev *regulator;
Liam Girdwood414c70c2008-04-30 15:59:04 +010047};
48
Liam Girdwood414c70c2008-04-30 15:59:04 +010049/*
50 * struct regulator
51 *
52 * One for each consumer device.
53 */
54struct regulator {
55 struct device *dev;
56 struct list_head list;
57 int uA_load;
58 int min_uV;
59 int max_uV;
Liam Girdwood414c70c2008-04-30 15:59:04 +010060 char *supply_name;
61 struct device_attribute dev_attr;
62 struct regulator_dev *rdev;
63};
64
65static int _regulator_is_enabled(struct regulator_dev *rdev);
66static int _regulator_disable(struct regulator_dev *rdev);
67static int _regulator_get_voltage(struct regulator_dev *rdev);
68static int _regulator_get_current_limit(struct regulator_dev *rdev);
69static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
70static void _notifier_call_chain(struct regulator_dev *rdev,
71 unsigned long event, void *data);
72
Mark Brown1083c392009-10-22 16:31:32 +010073static const char *rdev_get_name(struct regulator_dev *rdev)
74{
75 if (rdev->constraints && rdev->constraints->name)
76 return rdev->constraints->name;
77 else if (rdev->desc->name)
78 return rdev->desc->name;
79 else
80 return "";
81}
82
Liam Girdwood414c70c2008-04-30 15:59:04 +010083/* gets the regulator for a given consumer device */
84static struct regulator *get_device_regulator(struct device *dev)
85{
86 struct regulator *regulator = NULL;
87 struct regulator_dev *rdev;
88
89 mutex_lock(&regulator_list_mutex);
90 list_for_each_entry(rdev, &regulator_list, list) {
91 mutex_lock(&rdev->mutex);
92 list_for_each_entry(regulator, &rdev->consumer_list, list) {
93 if (regulator->dev == dev) {
94 mutex_unlock(&rdev->mutex);
95 mutex_unlock(&regulator_list_mutex);
96 return regulator;
97 }
98 }
99 mutex_unlock(&rdev->mutex);
100 }
101 mutex_unlock(&regulator_list_mutex);
102 return NULL;
103}
104
105/* Platform voltage constraint check */
106static int regulator_check_voltage(struct regulator_dev *rdev,
107 int *min_uV, int *max_uV)
108{
109 BUG_ON(*min_uV > *max_uV);
110
111 if (!rdev->constraints) {
112 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
Mark Brown1083c392009-10-22 16:31:32 +0100113 rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +0100114 return -ENODEV;
115 }
116 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
117 printk(KERN_ERR "%s: operation not allowed for %s\n",
Mark Brown1083c392009-10-22 16:31:32 +0100118 __func__, rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +0100119 return -EPERM;
120 }
121
122 if (*max_uV > rdev->constraints->max_uV)
123 *max_uV = rdev->constraints->max_uV;
124 if (*min_uV < rdev->constraints->min_uV)
125 *min_uV = rdev->constraints->min_uV;
126
127 if (*min_uV > *max_uV)
128 return -EINVAL;
129
130 return 0;
131}
132
133/* current constraint check */
134static int regulator_check_current_limit(struct regulator_dev *rdev,
135 int *min_uA, int *max_uA)
136{
137 BUG_ON(*min_uA > *max_uA);
138
139 if (!rdev->constraints) {
140 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
Mark Brown1083c392009-10-22 16:31:32 +0100141 rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +0100142 return -ENODEV;
143 }
144 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
145 printk(KERN_ERR "%s: operation not allowed for %s\n",
Mark Brown1083c392009-10-22 16:31:32 +0100146 __func__, rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +0100147 return -EPERM;
148 }
149
150 if (*max_uA > rdev->constraints->max_uA)
151 *max_uA = rdev->constraints->max_uA;
152 if (*min_uA < rdev->constraints->min_uA)
153 *min_uA = rdev->constraints->min_uA;
154
155 if (*min_uA > *max_uA)
156 return -EINVAL;
157
158 return 0;
159}
160
161/* operating mode constraint check */
162static int regulator_check_mode(struct regulator_dev *rdev, int mode)
163{
David Brownelle5735202008-11-16 11:46:56 -0800164 switch (mode) {
165 case REGULATOR_MODE_FAST:
166 case REGULATOR_MODE_NORMAL:
167 case REGULATOR_MODE_IDLE:
168 case REGULATOR_MODE_STANDBY:
169 break;
170 default:
171 return -EINVAL;
172 }
173
Liam Girdwood414c70c2008-04-30 15:59:04 +0100174 if (!rdev->constraints) {
175 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
Mark Brown1083c392009-10-22 16:31:32 +0100176 rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +0100177 return -ENODEV;
178 }
179 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
180 printk(KERN_ERR "%s: operation not allowed for %s\n",
Mark Brown1083c392009-10-22 16:31:32 +0100181 __func__, rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +0100182 return -EPERM;
183 }
184 if (!(rdev->constraints->valid_modes_mask & mode)) {
185 printk(KERN_ERR "%s: invalid mode %x for %s\n",
Mark Brown1083c392009-10-22 16:31:32 +0100186 __func__, mode, rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +0100187 return -EINVAL;
188 }
189 return 0;
190}
191
192/* dynamic regulator mode switching constraint check */
193static int regulator_check_drms(struct regulator_dev *rdev)
194{
195 if (!rdev->constraints) {
196 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
Mark Brown1083c392009-10-22 16:31:32 +0100197 rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +0100198 return -ENODEV;
199 }
200 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
201 printk(KERN_ERR "%s: operation not allowed for %s\n",
Mark Brown1083c392009-10-22 16:31:32 +0100202 __func__, rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +0100203 return -EPERM;
204 }
205 return 0;
206}
207
208static ssize_t device_requested_uA_show(struct device *dev,
209 struct device_attribute *attr, char *buf)
210{
211 struct regulator *regulator;
212
213 regulator = get_device_regulator(dev);
214 if (regulator == NULL)
215 return 0;
216
217 return sprintf(buf, "%d\n", regulator->uA_load);
218}
219
220static ssize_t regulator_uV_show(struct device *dev,
221 struct device_attribute *attr, char *buf)
222{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100223 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100224 ssize_t ret;
225
226 mutex_lock(&rdev->mutex);
227 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
228 mutex_unlock(&rdev->mutex);
229
230 return ret;
231}
David Brownell7ad68e22008-11-11 17:39:02 -0800232static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100233
234static ssize_t regulator_uA_show(struct device *dev,
235 struct device_attribute *attr, char *buf)
236{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100237 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100238
239 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
240}
David Brownell7ad68e22008-11-11 17:39:02 -0800241static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100242
Mark Brownbc558a62008-10-10 15:33:20 +0100243static ssize_t regulator_name_show(struct device *dev,
244 struct device_attribute *attr, char *buf)
245{
246 struct regulator_dev *rdev = dev_get_drvdata(dev);
Mark Brownbc558a62008-10-10 15:33:20 +0100247
Mark Brown1083c392009-10-22 16:31:32 +0100248 return sprintf(buf, "%s\n", rdev_get_name(rdev));
Mark Brownbc558a62008-10-10 15:33:20 +0100249}
250
David Brownell4fca9542008-11-11 17:38:53 -0800251static ssize_t regulator_print_opmode(char *buf, int mode)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100252{
Liam Girdwood414c70c2008-04-30 15:59:04 +0100253 switch (mode) {
254 case REGULATOR_MODE_FAST:
255 return sprintf(buf, "fast\n");
256 case REGULATOR_MODE_NORMAL:
257 return sprintf(buf, "normal\n");
258 case REGULATOR_MODE_IDLE:
259 return sprintf(buf, "idle\n");
260 case REGULATOR_MODE_STANDBY:
261 return sprintf(buf, "standby\n");
262 }
263 return sprintf(buf, "unknown\n");
264}
265
David Brownell4fca9542008-11-11 17:38:53 -0800266static ssize_t regulator_opmode_show(struct device *dev,
267 struct device_attribute *attr, char *buf)
Liam Girdwood414c70c2008-04-30 15:59:04 +0100268{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100269 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100270
David Brownell4fca9542008-11-11 17:38:53 -0800271 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
272}
David Brownell7ad68e22008-11-11 17:39:02 -0800273static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
David Brownell4fca9542008-11-11 17:38:53 -0800274
275static ssize_t regulator_print_state(char *buf, int state)
276{
Liam Girdwood414c70c2008-04-30 15:59:04 +0100277 if (state > 0)
278 return sprintf(buf, "enabled\n");
279 else if (state == 0)
280 return sprintf(buf, "disabled\n");
281 else
282 return sprintf(buf, "unknown\n");
283}
284
David Brownell4fca9542008-11-11 17:38:53 -0800285static ssize_t regulator_state_show(struct device *dev,
286 struct device_attribute *attr, char *buf)
287{
288 struct regulator_dev *rdev = dev_get_drvdata(dev);
Mark Brown93325462009-08-03 18:49:56 +0100289 ssize_t ret;
David Brownell4fca9542008-11-11 17:38:53 -0800290
Mark Brown93325462009-08-03 18:49:56 +0100291 mutex_lock(&rdev->mutex);
292 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
293 mutex_unlock(&rdev->mutex);
294
295 return ret;
David Brownell4fca9542008-11-11 17:38:53 -0800296}
David Brownell7ad68e22008-11-11 17:39:02 -0800297static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
David Brownell4fca9542008-11-11 17:38:53 -0800298
David Brownell853116a2009-01-14 23:03:17 -0800299static ssize_t regulator_status_show(struct device *dev,
300 struct device_attribute *attr, char *buf)
301{
302 struct regulator_dev *rdev = dev_get_drvdata(dev);
303 int status;
304 char *label;
305
306 status = rdev->desc->ops->get_status(rdev);
307 if (status < 0)
308 return status;
309
310 switch (status) {
311 case REGULATOR_STATUS_OFF:
312 label = "off";
313 break;
314 case REGULATOR_STATUS_ON:
315 label = "on";
316 break;
317 case REGULATOR_STATUS_ERROR:
318 label = "error";
319 break;
320 case REGULATOR_STATUS_FAST:
321 label = "fast";
322 break;
323 case REGULATOR_STATUS_NORMAL:
324 label = "normal";
325 break;
326 case REGULATOR_STATUS_IDLE:
327 label = "idle";
328 break;
329 case REGULATOR_STATUS_STANDBY:
330 label = "standby";
331 break;
332 default:
333 return -ERANGE;
334 }
335
336 return sprintf(buf, "%s\n", label);
337}
338static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
339
Liam Girdwood414c70c2008-04-30 15:59:04 +0100340static ssize_t regulator_min_uA_show(struct device *dev,
341 struct device_attribute *attr, char *buf)
342{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100343 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100344
345 if (!rdev->constraints)
346 return sprintf(buf, "constraint not defined\n");
347
348 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
349}
David Brownell7ad68e22008-11-11 17:39:02 -0800350static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100351
352static ssize_t regulator_max_uA_show(struct device *dev,
353 struct device_attribute *attr, char *buf)
354{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100355 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100356
357 if (!rdev->constraints)
358 return sprintf(buf, "constraint not defined\n");
359
360 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
361}
David Brownell7ad68e22008-11-11 17:39:02 -0800362static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100363
364static ssize_t regulator_min_uV_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 if (!rdev->constraints)
370 return sprintf(buf, "constraint not defined\n");
371
372 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
373}
David Brownell7ad68e22008-11-11 17:39:02 -0800374static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100375
376static ssize_t regulator_max_uV_show(struct device *dev,
377 struct device_attribute *attr, char *buf)
378{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100379 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100380
381 if (!rdev->constraints)
382 return sprintf(buf, "constraint not defined\n");
383
384 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
385}
David Brownell7ad68e22008-11-11 17:39:02 -0800386static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100387
388static ssize_t regulator_total_uA_show(struct device *dev,
389 struct device_attribute *attr, char *buf)
390{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100391 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100392 struct regulator *regulator;
393 int uA = 0;
394
395 mutex_lock(&rdev->mutex);
396 list_for_each_entry(regulator, &rdev->consumer_list, list)
Stefan Roesefa2984d2009-11-27 15:56:34 +0100397 uA += regulator->uA_load;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100398 mutex_unlock(&rdev->mutex);
399 return sprintf(buf, "%d\n", uA);
400}
David Brownell7ad68e22008-11-11 17:39:02 -0800401static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100402
403static ssize_t regulator_num_users_show(struct device *dev,
404 struct device_attribute *attr, char *buf)
405{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100406 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100407 return sprintf(buf, "%d\n", rdev->use_count);
408}
409
410static ssize_t regulator_type_show(struct device *dev,
411 struct device_attribute *attr, char *buf)
412{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100413 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100414
415 switch (rdev->desc->type) {
416 case REGULATOR_VOLTAGE:
417 return sprintf(buf, "voltage\n");
418 case REGULATOR_CURRENT:
419 return sprintf(buf, "current\n");
420 }
421 return sprintf(buf, "unknown\n");
422}
423
424static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
425 struct device_attribute *attr, char *buf)
426{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100427 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100428
Liam Girdwood414c70c2008-04-30 15:59:04 +0100429 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
430}
David Brownell7ad68e22008-11-11 17:39:02 -0800431static DEVICE_ATTR(suspend_mem_microvolts, 0444,
432 regulator_suspend_mem_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100433
434static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
435 struct device_attribute *attr, char *buf)
436{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100437 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100438
Liam Girdwood414c70c2008-04-30 15:59:04 +0100439 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
440}
David Brownell7ad68e22008-11-11 17:39:02 -0800441static DEVICE_ATTR(suspend_disk_microvolts, 0444,
442 regulator_suspend_disk_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100443
444static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
445 struct device_attribute *attr, char *buf)
446{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100447 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100448
Liam Girdwood414c70c2008-04-30 15:59:04 +0100449 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
450}
David Brownell7ad68e22008-11-11 17:39:02 -0800451static DEVICE_ATTR(suspend_standby_microvolts, 0444,
452 regulator_suspend_standby_uV_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100453
Liam Girdwood414c70c2008-04-30 15:59:04 +0100454static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
455 struct device_attribute *attr, char *buf)
456{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100457 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100458
David Brownell4fca9542008-11-11 17:38:53 -0800459 return regulator_print_opmode(buf,
460 rdev->constraints->state_mem.mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100461}
David Brownell7ad68e22008-11-11 17:39:02 -0800462static DEVICE_ATTR(suspend_mem_mode, 0444,
463 regulator_suspend_mem_mode_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100464
465static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
466 struct device_attribute *attr, char *buf)
467{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100468 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100469
David Brownell4fca9542008-11-11 17:38:53 -0800470 return regulator_print_opmode(buf,
471 rdev->constraints->state_disk.mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100472}
David Brownell7ad68e22008-11-11 17:39:02 -0800473static DEVICE_ATTR(suspend_disk_mode, 0444,
474 regulator_suspend_disk_mode_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100475
476static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
477 struct device_attribute *attr, char *buf)
478{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100479 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100480
David Brownell4fca9542008-11-11 17:38:53 -0800481 return regulator_print_opmode(buf,
482 rdev->constraints->state_standby.mode);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100483}
David Brownell7ad68e22008-11-11 17:39:02 -0800484static DEVICE_ATTR(suspend_standby_mode, 0444,
485 regulator_suspend_standby_mode_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100486
487static ssize_t regulator_suspend_mem_state_show(struct device *dev,
488 struct device_attribute *attr, char *buf)
489{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100490 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100491
David Brownell4fca9542008-11-11 17:38:53 -0800492 return regulator_print_state(buf,
493 rdev->constraints->state_mem.enabled);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100494}
David Brownell7ad68e22008-11-11 17:39:02 -0800495static DEVICE_ATTR(suspend_mem_state, 0444,
496 regulator_suspend_mem_state_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100497
498static ssize_t regulator_suspend_disk_state_show(struct device *dev,
499 struct device_attribute *attr, char *buf)
500{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100501 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100502
David Brownell4fca9542008-11-11 17:38:53 -0800503 return regulator_print_state(buf,
504 rdev->constraints->state_disk.enabled);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100505}
David Brownell7ad68e22008-11-11 17:39:02 -0800506static DEVICE_ATTR(suspend_disk_state, 0444,
507 regulator_suspend_disk_state_show, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100508
509static ssize_t regulator_suspend_standby_state_show(struct device *dev,
510 struct device_attribute *attr, char *buf)
511{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100512 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100513
David Brownell4fca9542008-11-11 17:38:53 -0800514 return regulator_print_state(buf,
515 rdev->constraints->state_standby.enabled);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100516}
David Brownell7ad68e22008-11-11 17:39:02 -0800517static DEVICE_ATTR(suspend_standby_state, 0444,
518 regulator_suspend_standby_state_show, NULL);
Mark Brownbc558a62008-10-10 15:33:20 +0100519
David Brownell7ad68e22008-11-11 17:39:02 -0800520
521/*
522 * These are the only attributes are present for all regulators.
523 * Other attributes are a function of regulator functionality.
524 */
Liam Girdwood414c70c2008-04-30 15:59:04 +0100525static struct device_attribute regulator_dev_attrs[] = {
Mark Brownbc558a62008-10-10 15:33:20 +0100526 __ATTR(name, 0444, regulator_name_show, NULL),
Liam Girdwood414c70c2008-04-30 15:59:04 +0100527 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
528 __ATTR(type, 0444, regulator_type_show, NULL),
Liam Girdwood414c70c2008-04-30 15:59:04 +0100529 __ATTR_NULL,
530};
531
532static void regulator_dev_release(struct device *dev)
533{
Liam Girdwooda5766f12008-10-10 13:22:20 +0100534 struct regulator_dev *rdev = dev_get_drvdata(dev);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100535 kfree(rdev);
536}
537
538static struct class regulator_class = {
539 .name = "regulator",
540 .dev_release = regulator_dev_release,
541 .dev_attrs = regulator_dev_attrs,
542};
543
544/* Calculate the new optimum regulator operating mode based on the new total
545 * consumer load. All locks held by caller */
546static void drms_uA_update(struct regulator_dev *rdev)
547{
548 struct regulator *sibling;
549 int current_uA = 0, output_uV, input_uV, err;
550 unsigned int mode;
551
552 err = regulator_check_drms(rdev);
553 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
Dan Carpenter036de8e2009-04-08 13:52:39 +0300554 !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode)
555 return;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100556
557 /* get output voltage */
558 output_uV = rdev->desc->ops->get_voltage(rdev);
559 if (output_uV <= 0)
560 return;
561
562 /* get input voltage */
563 if (rdev->supply && rdev->supply->desc->ops->get_voltage)
564 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
565 else
566 input_uV = rdev->constraints->input_uV;
567 if (input_uV <= 0)
568 return;
569
570 /* calc total requested load */
571 list_for_each_entry(sibling, &rdev->consumer_list, list)
Stefan Roesefa2984d2009-11-27 15:56:34 +0100572 current_uA += sibling->uA_load;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100573
574 /* now get the optimum mode for our new total regulator load */
575 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
576 output_uV, current_uA);
577
578 /* check the new mode is allowed */
579 err = regulator_check_mode(rdev, mode);
580 if (err == 0)
581 rdev->desc->ops->set_mode(rdev, mode);
582}
583
584static int suspend_set_state(struct regulator_dev *rdev,
585 struct regulator_state *rstate)
586{
587 int ret = 0;
Mark Brown638f85c2009-10-22 16:31:33 +0100588 bool can_set_state;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100589
Mark Brown638f85c2009-10-22 16:31:33 +0100590 can_set_state = rdev->desc->ops->set_suspend_enable &&
591 rdev->desc->ops->set_suspend_disable;
592
593 /* If we have no suspend mode configration don't set anything;
594 * only warn if the driver actually makes the suspend mode
595 * configurable.
596 */
597 if (!rstate->enabled && !rstate->disabled) {
598 if (can_set_state)
599 printk(KERN_WARNING "%s: No configuration for %s\n",
600 __func__, rdev_get_name(rdev));
601 return 0;
602 }
603
604 if (rstate->enabled && rstate->disabled) {
605 printk(KERN_ERR "%s: invalid configuration for %s\n",
606 __func__, rdev_get_name(rdev));
607 return -EINVAL;
608 }
609
610 if (!can_set_state) {
Liam Girdwooda5766f12008-10-10 13:22:20 +0100611 printk(KERN_ERR "%s: no way to set suspend state\n",
612 __func__);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100613 return -EINVAL;
Liam Girdwooda5766f12008-10-10 13:22:20 +0100614 }
Liam Girdwood414c70c2008-04-30 15:59:04 +0100615
616 if (rstate->enabled)
617 ret = rdev->desc->ops->set_suspend_enable(rdev);
618 else
619 ret = rdev->desc->ops->set_suspend_disable(rdev);
620 if (ret < 0) {
621 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__);
622 return ret;
623 }
624
625 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
626 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
627 if (ret < 0) {
628 printk(KERN_ERR "%s: failed to set voltage\n",
629 __func__);
630 return ret;
631 }
632 }
633
634 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
635 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
636 if (ret < 0) {
637 printk(KERN_ERR "%s: failed to set mode\n", __func__);
638 return ret;
639 }
640 }
641 return ret;
642}
643
644/* locks held by caller */
645static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
646{
647 if (!rdev->constraints)
648 return -EINVAL;
649
650 switch (state) {
651 case PM_SUSPEND_STANDBY:
652 return suspend_set_state(rdev,
653 &rdev->constraints->state_standby);
654 case PM_SUSPEND_MEM:
655 return suspend_set_state(rdev,
656 &rdev->constraints->state_mem);
657 case PM_SUSPEND_MAX:
658 return suspend_set_state(rdev,
659 &rdev->constraints->state_disk);
660 default:
661 return -EINVAL;
662 }
663}
664
665static void print_constraints(struct regulator_dev *rdev)
666{
667 struct regulation_constraints *constraints = rdev->constraints;
Mark Brown973e9a22010-02-11 19:20:48 +0000668 char buf[80] = "";
Mark Brown8f031b42009-10-22 16:31:31 +0100669 int count = 0;
670 int ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +0100671
Mark Brown8f031b42009-10-22 16:31:31 +0100672 if (constraints->min_uV && constraints->max_uV) {
Liam Girdwood414c70c2008-04-30 15:59:04 +0100673 if (constraints->min_uV == constraints->max_uV)
Mark Brown8f031b42009-10-22 16:31:31 +0100674 count += sprintf(buf + count, "%d mV ",
675 constraints->min_uV / 1000);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100676 else
Mark Brown8f031b42009-10-22 16:31:31 +0100677 count += sprintf(buf + count, "%d <--> %d mV ",
678 constraints->min_uV / 1000,
679 constraints->max_uV / 1000);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100680 }
Mark Brown8f031b42009-10-22 16:31:31 +0100681
682 if (!constraints->min_uV ||
683 constraints->min_uV != constraints->max_uV) {
684 ret = _regulator_get_voltage(rdev);
685 if (ret > 0)
686 count += sprintf(buf + count, "at %d mV ", ret / 1000);
687 }
688
689 if (constraints->min_uA && constraints->max_uA) {
690 if (constraints->min_uA == constraints->max_uA)
691 count += sprintf(buf + count, "%d mA ",
692 constraints->min_uA / 1000);
693 else
694 count += sprintf(buf + count, "%d <--> %d mA ",
695 constraints->min_uA / 1000,
696 constraints->max_uA / 1000);
697 }
698
699 if (!constraints->min_uA ||
700 constraints->min_uA != constraints->max_uA) {
701 ret = _regulator_get_current_limit(rdev);
702 if (ret > 0)
703 count += sprintf(buf + count, "at %d uA ", ret / 1000);
704 }
705
Liam Girdwood414c70c2008-04-30 15:59:04 +0100706 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
707 count += sprintf(buf + count, "fast ");
708 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
709 count += sprintf(buf + count, "normal ");
710 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
711 count += sprintf(buf + count, "idle ");
712 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
713 count += sprintf(buf + count, "standby");
714
Mark Brown1083c392009-10-22 16:31:32 +0100715 printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf);
Liam Girdwood414c70c2008-04-30 15:59:04 +0100716}
717
Mark Browne79055d2009-10-19 15:53:50 +0100718static int machine_constraints_voltage(struct regulator_dev *rdev,
Mark Brown1083c392009-10-22 16:31:32 +0100719 struct regulation_constraints *constraints)
Mark Browne79055d2009-10-19 15:53:50 +0100720{
721 struct regulator_ops *ops = rdev->desc->ops;
Mark Brown1083c392009-10-22 16:31:32 +0100722 const char *name = rdev_get_name(rdev);
Mark Brownaf5866c2009-10-22 16:31:30 +0100723 int ret;
724
725 /* do we need to apply the constraint voltage */
726 if (rdev->constraints->apply_uV &&
727 rdev->constraints->min_uV == rdev->constraints->max_uV &&
728 ops->set_voltage) {
729 ret = ops->set_voltage(rdev,
730 rdev->constraints->min_uV, rdev->constraints->max_uV);
731 if (ret < 0) {
732 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n",
733 __func__,
734 rdev->constraints->min_uV, name);
735 rdev->constraints = NULL;
736 return ret;
737 }
738 }
Mark Browne79055d2009-10-19 15:53:50 +0100739
740 /* constrain machine-level voltage specs to fit
741 * the actual range supported by this regulator.
742 */
743 if (ops->list_voltage && rdev->desc->n_voltages) {
744 int count = rdev->desc->n_voltages;
745 int i;
746 int min_uV = INT_MAX;
747 int max_uV = INT_MIN;
748 int cmin = constraints->min_uV;
749 int cmax = constraints->max_uV;
750
751 /* it's safe to autoconfigure fixed-voltage supplies
752 and the constraints are used by list_voltage. */
753 if (count == 1 && !cmin) {
754 cmin = 1;
755 cmax = INT_MAX;
756 constraints->min_uV = cmin;
757 constraints->max_uV = cmax;
758 }
759
760 /* voltage constraints are optional */
761 if ((cmin == 0) && (cmax == 0))
762 return 0;
763
764 /* else require explicit machine-level constraints */
765 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
766 pr_err("%s: %s '%s' voltage constraints\n",
767 __func__, "invalid", name);
768 return -EINVAL;
769 }
770
771 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
772 for (i = 0; i < count; i++) {
773 int value;
774
775 value = ops->list_voltage(rdev, i);
776 if (value <= 0)
777 continue;
778
779 /* maybe adjust [min_uV..max_uV] */
780 if (value >= cmin && value < min_uV)
781 min_uV = value;
782 if (value <= cmax && value > max_uV)
783 max_uV = value;
784 }
785
786 /* final: [min_uV..max_uV] valid iff constraints valid */
787 if (max_uV < min_uV) {
788 pr_err("%s: %s '%s' voltage constraints\n",
789 __func__, "unsupportable", name);
790 return -EINVAL;
791 }
792
793 /* use regulator's subset of machine constraints */
794 if (constraints->min_uV < min_uV) {
795 pr_debug("%s: override '%s' %s, %d -> %d\n",
796 __func__, name, "min_uV",
797 constraints->min_uV, min_uV);
798 constraints->min_uV = min_uV;
799 }
800 if (constraints->max_uV > max_uV) {
801 pr_debug("%s: override '%s' %s, %d -> %d\n",
802 __func__, name, "max_uV",
803 constraints->max_uV, max_uV);
804 constraints->max_uV = max_uV;
805 }
806 }
807
808 return 0;
809}
810
Liam Girdwooda5766f12008-10-10 13:22:20 +0100811/**
812 * set_machine_constraints - sets regulator constraints
Mark Brown69279fb2008-12-31 12:52:41 +0000813 * @rdev: regulator source
Mark Brownc8e7e462008-12-31 12:52:42 +0000814 * @constraints: constraints to apply
Liam Girdwooda5766f12008-10-10 13:22:20 +0100815 *
816 * Allows platform initialisation code to define and constrain
817 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
818 * Constraints *must* be set by platform code in order for some
819 * regulator operations to proceed i.e. set_voltage, set_current_limit,
820 * set_mode.
821 */
822static int set_machine_constraints(struct regulator_dev *rdev,
823 struct regulation_constraints *constraints)
824{
825 int ret = 0;
Mark Browne06f5b42008-09-09 16:21:19 +0100826 const char *name;
Mark Browne5fda262008-09-09 16:21:20 +0100827 struct regulator_ops *ops = rdev->desc->ops;
Mark Browne06f5b42008-09-09 16:21:19 +0100828
Mark Brownaf5866c2009-10-22 16:31:30 +0100829 rdev->constraints = constraints;
830
Mark Brown1083c392009-10-22 16:31:32 +0100831 name = rdev_get_name(rdev);
832
833 ret = machine_constraints_voltage(rdev, constraints);
Mark Browne79055d2009-10-19 15:53:50 +0100834 if (ret != 0)
835 goto out;
David Brownell4367cfd2009-02-26 11:48:36 -0800836
Liam Girdwooda5766f12008-10-10 13:22:20 +0100837 /* do we need to setup our suspend state */
Mark Browne06f5b42008-09-09 16:21:19 +0100838 if (constraints->initial_state) {
Liam Girdwooda5766f12008-10-10 13:22:20 +0100839 ret = suspend_prepare(rdev, constraints->initial_state);
Mark Browne06f5b42008-09-09 16:21:19 +0100840 if (ret < 0) {
841 printk(KERN_ERR "%s: failed to set suspend state for %s\n",
842 __func__, name);
843 rdev->constraints = NULL;
844 goto out;
845 }
846 }
Liam Girdwooda5766f12008-10-10 13:22:20 +0100847
Mark Browna3084662009-02-26 19:24:19 +0000848 if (constraints->initial_mode) {
849 if (!ops->set_mode) {
850 printk(KERN_ERR "%s: no set_mode operation for %s\n",
851 __func__, name);
852 ret = -EINVAL;
853 goto out;
854 }
855
856 ret = ops->set_mode(rdev, constraints->initial_mode);
857 if (ret < 0) {
858 printk(KERN_ERR
859 "%s: failed to set initial mode for %s: %d\n",
860 __func__, name, ret);
861 goto out;
862 }
863 }
864
Mark Browncacf90f2009-03-02 16:32:46 +0000865 /* If the constraints say the regulator should be on at this point
866 * and we have control then make sure it is enabled.
867 */
868 if ((constraints->always_on || constraints->boot_on) && ops->enable) {
Mark Browne5fda262008-09-09 16:21:20 +0100869 ret = ops->enable(rdev);
870 if (ret < 0) {
871 printk(KERN_ERR "%s: failed to enable %s\n",
872 __func__, name);
873 rdev->constraints = NULL;
874 goto out;
875 }
876 }
877
Liam Girdwooda5766f12008-10-10 13:22:20 +0100878 print_constraints(rdev);
879out:
880 return ret;
881}
882
883/**
884 * set_supply - set regulator supply regulator
Mark Brown69279fb2008-12-31 12:52:41 +0000885 * @rdev: regulator name
886 * @supply_rdev: supply regulator name
Liam Girdwooda5766f12008-10-10 13:22:20 +0100887 *
888 * Called by platform initialisation code to set the supply regulator for this
889 * regulator. This ensures that a regulators supply will also be enabled by the
890 * core if it's child is enabled.
891 */
892static int set_supply(struct regulator_dev *rdev,
893 struct regulator_dev *supply_rdev)
894{
895 int err;
896
897 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
898 "supply");
899 if (err) {
900 printk(KERN_ERR
901 "%s: could not add device link %s err %d\n",
902 __func__, supply_rdev->dev.kobj.name, err);
903 goto out;
904 }
905 rdev->supply = supply_rdev;
906 list_add(&rdev->slist, &supply_rdev->supply_list);
907out:
908 return err;
909}
910
911/**
912 * set_consumer_device_supply: Bind a regulator to a symbolic supply
Mark Brown69279fb2008-12-31 12:52:41 +0000913 * @rdev: regulator source
914 * @consumer_dev: device the supply applies to
Mark Brown40f92442009-06-17 17:56:39 +0100915 * @consumer_dev_name: dev_name() string for device supply applies to
Mark Brown69279fb2008-12-31 12:52:41 +0000916 * @supply: symbolic name for supply
Liam Girdwooda5766f12008-10-10 13:22:20 +0100917 *
918 * Allows platform initialisation code to map physical regulator
919 * sources to symbolic names for supplies for use by devices. Devices
920 * should use these symbolic names to request regulators, avoiding the
921 * need to provide board-specific regulator names as platform data.
Mark Brown40f92442009-06-17 17:56:39 +0100922 *
923 * Only one of consumer_dev and consumer_dev_name may be specified.
Liam Girdwooda5766f12008-10-10 13:22:20 +0100924 */
925static int set_consumer_device_supply(struct regulator_dev *rdev,
Mark Brown40f92442009-06-17 17:56:39 +0100926 struct device *consumer_dev, const char *consumer_dev_name,
927 const char *supply)
Liam Girdwooda5766f12008-10-10 13:22:20 +0100928{
929 struct regulator_map *node;
Mark Brown9ed20992009-07-21 16:00:26 +0100930 int has_dev;
Liam Girdwooda5766f12008-10-10 13:22:20 +0100931
Mark Brown40f92442009-06-17 17:56:39 +0100932 if (consumer_dev && consumer_dev_name)
933 return -EINVAL;
934
935 if (!consumer_dev_name && consumer_dev)
936 consumer_dev_name = dev_name(consumer_dev);
937
Liam Girdwooda5766f12008-10-10 13:22:20 +0100938 if (supply == NULL)
939 return -EINVAL;
940
Mark Brown9ed20992009-07-21 16:00:26 +0100941 if (consumer_dev_name != NULL)
942 has_dev = 1;
943 else
944 has_dev = 0;
945
David Brownell6001e132008-12-31 12:54:19 +0000946 list_for_each_entry(node, &regulator_map_list, list) {
Jani Nikula23b5cc22010-04-29 10:55:09 +0300947 if (node->dev_name && consumer_dev_name) {
948 if (strcmp(node->dev_name, consumer_dev_name) != 0)
949 continue;
950 } else if (node->dev_name || consumer_dev_name) {
David Brownell6001e132008-12-31 12:54:19 +0000951 continue;
Jani Nikula23b5cc22010-04-29 10:55:09 +0300952 }
953
David Brownell6001e132008-12-31 12:54:19 +0000954 if (strcmp(node->supply, supply) != 0)
955 continue;
956
957 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
958 dev_name(&node->regulator->dev),
959 node->regulator->desc->name,
960 supply,
Mark Brown1083c392009-10-22 16:31:32 +0100961 dev_name(&rdev->dev), rdev_get_name(rdev));
David Brownell6001e132008-12-31 12:54:19 +0000962 return -EBUSY;
963 }
964
Mark Brown9ed20992009-07-21 16:00:26 +0100965 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
Liam Girdwooda5766f12008-10-10 13:22:20 +0100966 if (node == NULL)
967 return -ENOMEM;
968
969 node->regulator = rdev;
Liam Girdwooda5766f12008-10-10 13:22:20 +0100970 node->supply = supply;
971
Mark Brown9ed20992009-07-21 16:00:26 +0100972 if (has_dev) {
973 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
974 if (node->dev_name == NULL) {
975 kfree(node);
976 return -ENOMEM;
977 }
Mark Brown40f92442009-06-17 17:56:39 +0100978 }
979
Liam Girdwooda5766f12008-10-10 13:22:20 +0100980 list_add(&node->list, &regulator_map_list);
981 return 0;
982}
983
Mike Rapoport0f1d7472009-01-22 16:00:29 +0200984static void unset_regulator_supplies(struct regulator_dev *rdev)
985{
986 struct regulator_map *node, *n;
987
988 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
989 if (rdev == node->regulator) {
990 list_del(&node->list);
Mark Brown40f92442009-06-17 17:56:39 +0100991 kfree(node->dev_name);
Mike Rapoport0f1d7472009-01-22 16:00:29 +0200992 kfree(node);
Mike Rapoport0f1d7472009-01-22 16:00:29 +0200993 }
994 }
995}
996
Liam Girdwood414c70c2008-04-30 15:59:04 +0100997#define REG_STR_SIZE 32
998
999static struct regulator *create_regulator(struct regulator_dev *rdev,
1000 struct device *dev,
1001 const char *supply_name)
1002{
1003 struct regulator *regulator;
1004 char buf[REG_STR_SIZE];
1005 int err, size;
1006
1007 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1008 if (regulator == NULL)
1009 return NULL;
1010
1011 mutex_lock(&rdev->mutex);
1012 regulator->rdev = rdev;
1013 list_add(&regulator->list, &rdev->consumer_list);
1014
1015 if (dev) {
1016 /* create a 'requested_microamps_name' sysfs entry */
1017 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
1018 supply_name);
1019 if (size >= REG_STR_SIZE)
1020 goto overflow_err;
1021
1022 regulator->dev = dev;
Ameya Palande4f26a2a2010-03-12 20:09:01 +02001023 sysfs_attr_init(&regulator->dev_attr.attr);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001024 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1025 if (regulator->dev_attr.attr.name == NULL)
1026 goto attr_name_err;
1027
Liam Girdwood414c70c2008-04-30 15:59:04 +01001028 regulator->dev_attr.attr.mode = 0444;
1029 regulator->dev_attr.show = device_requested_uA_show;
1030 err = device_create_file(dev, &regulator->dev_attr);
1031 if (err < 0) {
1032 printk(KERN_WARNING "%s: could not add regulator_dev"
1033 " load sysfs\n", __func__);
1034 goto attr_name_err;
1035 }
1036
1037 /* also add a link to the device sysfs entry */
1038 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1039 dev->kobj.name, supply_name);
1040 if (size >= REG_STR_SIZE)
1041 goto attr_err;
1042
1043 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1044 if (regulator->supply_name == NULL)
1045 goto attr_err;
1046
1047 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1048 buf);
1049 if (err) {
1050 printk(KERN_WARNING
1051 "%s: could not add device link %s err %d\n",
1052 __func__, dev->kobj.name, err);
1053 device_remove_file(dev, &regulator->dev_attr);
1054 goto link_name_err;
1055 }
1056 }
1057 mutex_unlock(&rdev->mutex);
1058 return regulator;
1059link_name_err:
1060 kfree(regulator->supply_name);
1061attr_err:
1062 device_remove_file(regulator->dev, &regulator->dev_attr);
1063attr_name_err:
1064 kfree(regulator->dev_attr.attr.name);
1065overflow_err:
1066 list_del(&regulator->list);
1067 kfree(regulator);
1068 mutex_unlock(&rdev->mutex);
1069 return NULL;
1070}
1071
Mark Brown31aae2b2009-12-21 12:21:52 +00001072static int _regulator_get_enable_time(struct regulator_dev *rdev)
1073{
1074 if (!rdev->desc->ops->enable_time)
1075 return 0;
1076 return rdev->desc->ops->enable_time(rdev);
1077}
1078
Mark Brown5ffbd132009-07-21 16:00:23 +01001079/* Internal regulator request function */
1080static struct regulator *_regulator_get(struct device *dev, const char *id,
1081 int exclusive)
Liam Girdwood414c70c2008-04-30 15:59:04 +01001082{
1083 struct regulator_dev *rdev;
1084 struct regulator_map *map;
1085 struct regulator *regulator = ERR_PTR(-ENODEV);
Mark Brown40f92442009-06-17 17:56:39 +01001086 const char *devname = NULL;
Mark Brown5ffbd132009-07-21 16:00:23 +01001087 int ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001088
1089 if (id == NULL) {
1090 printk(KERN_ERR "regulator: get() with no identifier\n");
1091 return regulator;
1092 }
1093
Mark Brown40f92442009-06-17 17:56:39 +01001094 if (dev)
1095 devname = dev_name(dev);
1096
Liam Girdwood414c70c2008-04-30 15:59:04 +01001097 mutex_lock(&regulator_list_mutex);
1098
1099 list_for_each_entry(map, &regulator_map_list, list) {
Mark Brown40f92442009-06-17 17:56:39 +01001100 /* If the mapping has a device set up it must match */
1101 if (map->dev_name &&
1102 (!devname || strcmp(map->dev_name, devname)))
1103 continue;
1104
1105 if (strcmp(map->supply, id) == 0) {
Liam Girdwooda5766f12008-10-10 13:22:20 +01001106 rdev = map->regulator;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001107 goto found;
Liam Girdwooda5766f12008-10-10 13:22:20 +01001108 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01001109 }
Mark Brown34abbd62010-02-12 10:18:08 +00001110
1111#ifdef CONFIG_REGULATOR_DUMMY
1112 if (!devname)
1113 devname = "deviceless";
1114
1115 /* If the board didn't flag that it was fully constrained then
1116 * substitute in a dummy regulator so consumers can continue.
1117 */
1118 if (!has_full_constraints) {
1119 pr_warning("%s supply %s not found, using dummy regulator\n",
1120 devname, id);
1121 rdev = dummy_regulator_rdev;
1122 goto found;
1123 }
1124#endif
1125
Liam Girdwood414c70c2008-04-30 15:59:04 +01001126 mutex_unlock(&regulator_list_mutex);
1127 return regulator;
1128
1129found:
Mark Brown5ffbd132009-07-21 16:00:23 +01001130 if (rdev->exclusive) {
1131 regulator = ERR_PTR(-EPERM);
1132 goto out;
1133 }
1134
1135 if (exclusive && rdev->open_count) {
1136 regulator = ERR_PTR(-EBUSY);
1137 goto out;
1138 }
1139
Liam Girdwooda5766f12008-10-10 13:22:20 +01001140 if (!try_module_get(rdev->owner))
1141 goto out;
1142
Liam Girdwood414c70c2008-04-30 15:59:04 +01001143 regulator = create_regulator(rdev, dev, id);
1144 if (regulator == NULL) {
1145 regulator = ERR_PTR(-ENOMEM);
1146 module_put(rdev->owner);
1147 }
1148
Mark Brown5ffbd132009-07-21 16:00:23 +01001149 rdev->open_count++;
1150 if (exclusive) {
1151 rdev->exclusive = 1;
1152
1153 ret = _regulator_is_enabled(rdev);
1154 if (ret > 0)
1155 rdev->use_count = 1;
1156 else
1157 rdev->use_count = 0;
1158 }
1159
Liam Girdwooda5766f12008-10-10 13:22:20 +01001160out:
Liam Girdwood414c70c2008-04-30 15:59:04 +01001161 mutex_unlock(&regulator_list_mutex);
Mark Brown5ffbd132009-07-21 16:00:23 +01001162
Liam Girdwood414c70c2008-04-30 15:59:04 +01001163 return regulator;
1164}
Mark Brown5ffbd132009-07-21 16:00:23 +01001165
1166/**
1167 * regulator_get - lookup and obtain a reference to a regulator.
1168 * @dev: device for regulator "consumer"
1169 * @id: Supply name or regulator ID.
1170 *
1171 * Returns a struct regulator corresponding to the regulator producer,
1172 * or IS_ERR() condition containing errno.
1173 *
1174 * Use of supply names configured via regulator_set_device_supply() is
1175 * strongly encouraged. It is recommended that the supply name used
1176 * should match the name used for the supply and/or the relevant
1177 * device pins in the datasheet.
1178 */
1179struct regulator *regulator_get(struct device *dev, const char *id)
1180{
1181 return _regulator_get(dev, id, 0);
1182}
Liam Girdwood414c70c2008-04-30 15:59:04 +01001183EXPORT_SYMBOL_GPL(regulator_get);
1184
1185/**
Mark Brown5ffbd132009-07-21 16:00:23 +01001186 * regulator_get_exclusive - obtain exclusive access to a regulator.
1187 * @dev: device for regulator "consumer"
1188 * @id: Supply name or regulator ID.
1189 *
1190 * Returns a struct regulator corresponding to the regulator producer,
1191 * or IS_ERR() condition containing errno. Other consumers will be
1192 * unable to obtain this reference is held and the use count for the
1193 * regulator will be initialised to reflect the current state of the
1194 * regulator.
1195 *
1196 * This is intended for use by consumers which cannot tolerate shared
1197 * use of the regulator such as those which need to force the
1198 * regulator off for correct operation of the hardware they are
1199 * controlling.
1200 *
1201 * Use of supply names configured via regulator_set_device_supply() is
1202 * strongly encouraged. It is recommended that the supply name used
1203 * should match the name used for the supply and/or the relevant
1204 * device pins in the datasheet.
1205 */
1206struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1207{
1208 return _regulator_get(dev, id, 1);
1209}
1210EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1211
1212/**
Liam Girdwood414c70c2008-04-30 15:59:04 +01001213 * regulator_put - "free" the regulator source
1214 * @regulator: regulator source
1215 *
1216 * Note: drivers must ensure that all regulator_enable calls made on this
1217 * regulator source are balanced by regulator_disable calls prior to calling
1218 * this function.
1219 */
1220void regulator_put(struct regulator *regulator)
1221{
1222 struct regulator_dev *rdev;
1223
1224 if (regulator == NULL || IS_ERR(regulator))
1225 return;
1226
Liam Girdwood414c70c2008-04-30 15:59:04 +01001227 mutex_lock(&regulator_list_mutex);
1228 rdev = regulator->rdev;
1229
1230 /* remove any sysfs entries */
1231 if (regulator->dev) {
1232 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1233 kfree(regulator->supply_name);
1234 device_remove_file(regulator->dev, &regulator->dev_attr);
1235 kfree(regulator->dev_attr.attr.name);
1236 }
1237 list_del(&regulator->list);
1238 kfree(regulator);
1239
Mark Brown5ffbd132009-07-21 16:00:23 +01001240 rdev->open_count--;
1241 rdev->exclusive = 0;
1242
Liam Girdwood414c70c2008-04-30 15:59:04 +01001243 module_put(rdev->owner);
1244 mutex_unlock(&regulator_list_mutex);
1245}
1246EXPORT_SYMBOL_GPL(regulator_put);
1247
Mark Brown9a2372f2009-08-03 18:49:57 +01001248static int _regulator_can_change_status(struct regulator_dev *rdev)
1249{
1250 if (!rdev->constraints)
1251 return 0;
1252
1253 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
1254 return 1;
1255 else
1256 return 0;
1257}
1258
Liam Girdwood414c70c2008-04-30 15:59:04 +01001259/* locks held by regulator_enable() */
1260static int _regulator_enable(struct regulator_dev *rdev)
1261{
Mark Brown31aae2b2009-12-21 12:21:52 +00001262 int ret, delay;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001263
1264 /* do we need to enable the supply regulator first */
1265 if (rdev->supply) {
1266 ret = _regulator_enable(rdev->supply);
1267 if (ret < 0) {
1268 printk(KERN_ERR "%s: failed to enable %s: %d\n",
Mark Brown1083c392009-10-22 16:31:32 +01001269 __func__, rdev_get_name(rdev), ret);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001270 return ret;
1271 }
1272 }
1273
1274 /* check voltage and requested load before enabling */
Mark Brown9a2372f2009-08-03 18:49:57 +01001275 if (rdev->constraints &&
1276 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1277 drms_uA_update(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001278
Mark Brown9a2372f2009-08-03 18:49:57 +01001279 if (rdev->use_count == 0) {
1280 /* The regulator may on if it's not switchable or left on */
1281 ret = _regulator_is_enabled(rdev);
1282 if (ret == -EINVAL || ret == 0) {
1283 if (!_regulator_can_change_status(rdev))
1284 return -EPERM;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001285
Mark Brown31aae2b2009-12-21 12:21:52 +00001286 if (!rdev->desc->ops->enable)
Mark Brown9a2372f2009-08-03 18:49:57 +01001287 return -EINVAL;
Mark Brown31aae2b2009-12-21 12:21:52 +00001288
1289 /* Query before enabling in case configuration
1290 * dependant. */
1291 ret = _regulator_get_enable_time(rdev);
1292 if (ret >= 0) {
1293 delay = ret;
1294 } else {
1295 printk(KERN_WARNING
1296 "%s: enable_time() failed for %s: %d\n",
1297 __func__, rdev_get_name(rdev),
1298 ret);
1299 delay = 0;
Mark Brown9a2372f2009-08-03 18:49:57 +01001300 }
Mark Brown31aae2b2009-12-21 12:21:52 +00001301
1302 /* Allow the regulator to ramp; it would be useful
1303 * to extend this for bulk operations so that the
1304 * regulators can ramp together. */
1305 ret = rdev->desc->ops->enable(rdev);
1306 if (ret < 0)
1307 return ret;
1308
1309 if (delay >= 1000)
1310 mdelay(delay / 1000);
1311 else if (delay)
1312 udelay(delay);
1313
Linus Walleija7433cf2009-08-26 12:54:04 +02001314 } else if (ret < 0) {
Mark Brown9a2372f2009-08-03 18:49:57 +01001315 printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n",
Mark Brown1083c392009-10-22 16:31:32 +01001316 __func__, rdev_get_name(rdev), ret);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001317 return ret;
1318 }
Linus Walleija7433cf2009-08-26 12:54:04 +02001319 /* Fallthrough on positive return values - already enabled */
Liam Girdwood414c70c2008-04-30 15:59:04 +01001320 }
1321
Mark Brown9a2372f2009-08-03 18:49:57 +01001322 rdev->use_count++;
1323
1324 return 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001325}
1326
1327/**
1328 * regulator_enable - enable regulator output
1329 * @regulator: regulator source
1330 *
Mark Browncf7bbcd2008-12-31 12:52:43 +00001331 * Request that the regulator be enabled with the regulator output at
1332 * the predefined voltage or current value. Calls to regulator_enable()
1333 * must be balanced with calls to regulator_disable().
1334 *
Liam Girdwood414c70c2008-04-30 15:59:04 +01001335 * NOTE: the output value can be set by other drivers, boot loader or may be
Mark Browncf7bbcd2008-12-31 12:52:43 +00001336 * hardwired in the regulator.
Liam Girdwood414c70c2008-04-30 15:59:04 +01001337 */
1338int regulator_enable(struct regulator *regulator)
1339{
David Brownell412aec62008-11-16 11:44:46 -08001340 struct regulator_dev *rdev = regulator->rdev;
1341 int ret = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001342
David Brownell412aec62008-11-16 11:44:46 -08001343 mutex_lock(&rdev->mutex);
David Brownellcd94b502009-03-11 16:43:34 -08001344 ret = _regulator_enable(rdev);
David Brownell412aec62008-11-16 11:44:46 -08001345 mutex_unlock(&rdev->mutex);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001346 return ret;
1347}
1348EXPORT_SYMBOL_GPL(regulator_enable);
1349
1350/* locks held by regulator_disable() */
1351static int _regulator_disable(struct regulator_dev *rdev)
1352{
1353 int ret = 0;
1354
David Brownellcd94b502009-03-11 16:43:34 -08001355 if (WARN(rdev->use_count <= 0,
1356 "unbalanced disables for %s\n",
Mark Brown1083c392009-10-22 16:31:32 +01001357 rdev_get_name(rdev)))
David Brownellcd94b502009-03-11 16:43:34 -08001358 return -EIO;
1359
Liam Girdwood414c70c2008-04-30 15:59:04 +01001360 /* are we the last user and permitted to disable ? */
Mark Brown60ef66f2009-10-13 13:06:50 +01001361 if (rdev->use_count == 1 &&
1362 (rdev->constraints && !rdev->constraints->always_on)) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01001363
1364 /* we are last user */
Mark Brown9a2372f2009-08-03 18:49:57 +01001365 if (_regulator_can_change_status(rdev) &&
1366 rdev->desc->ops->disable) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01001367 ret = rdev->desc->ops->disable(rdev);
1368 if (ret < 0) {
1369 printk(KERN_ERR "%s: failed to disable %s\n",
Mark Brown1083c392009-10-22 16:31:32 +01001370 __func__, rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +01001371 return ret;
1372 }
Mark Brown84b68262009-12-01 21:12:27 +00001373
1374 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1375 NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001376 }
1377
1378 /* decrease our supplies ref count and disable if required */
1379 if (rdev->supply)
1380 _regulator_disable(rdev->supply);
1381
1382 rdev->use_count = 0;
1383 } else if (rdev->use_count > 1) {
1384
1385 if (rdev->constraints &&
1386 (rdev->constraints->valid_ops_mask &
1387 REGULATOR_CHANGE_DRMS))
1388 drms_uA_update(rdev);
1389
1390 rdev->use_count--;
1391 }
1392 return ret;
1393}
1394
1395/**
1396 * regulator_disable - disable regulator output
1397 * @regulator: regulator source
1398 *
Mark Browncf7bbcd2008-12-31 12:52:43 +00001399 * Disable the regulator output voltage or current. Calls to
1400 * regulator_enable() must be balanced with calls to
1401 * regulator_disable().
Mark Brown69279fb2008-12-31 12:52:41 +00001402 *
Liam Girdwood414c70c2008-04-30 15:59:04 +01001403 * NOTE: this will only disable the regulator output if no other consumer
Mark Browncf7bbcd2008-12-31 12:52:43 +00001404 * devices have it enabled, the regulator device supports disabling and
1405 * machine constraints permit this operation.
Liam Girdwood414c70c2008-04-30 15:59:04 +01001406 */
1407int regulator_disable(struct regulator *regulator)
1408{
David Brownell412aec62008-11-16 11:44:46 -08001409 struct regulator_dev *rdev = regulator->rdev;
1410 int ret = 0;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001411
David Brownell412aec62008-11-16 11:44:46 -08001412 mutex_lock(&rdev->mutex);
David Brownellcd94b502009-03-11 16:43:34 -08001413 ret = _regulator_disable(rdev);
David Brownell412aec62008-11-16 11:44:46 -08001414 mutex_unlock(&rdev->mutex);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001415 return ret;
1416}
1417EXPORT_SYMBOL_GPL(regulator_disable);
1418
1419/* locks held by regulator_force_disable() */
1420static int _regulator_force_disable(struct regulator_dev *rdev)
1421{
1422 int ret = 0;
1423
1424 /* force disable */
1425 if (rdev->desc->ops->disable) {
1426 /* ah well, who wants to live forever... */
1427 ret = rdev->desc->ops->disable(rdev);
1428 if (ret < 0) {
1429 printk(KERN_ERR "%s: failed to force disable %s\n",
Mark Brown1083c392009-10-22 16:31:32 +01001430 __func__, rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +01001431 return ret;
1432 }
1433 /* notify other consumers that power has been forced off */
Mark Brown84b68262009-12-01 21:12:27 +00001434 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1435 REGULATOR_EVENT_DISABLE, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001436 }
1437
1438 /* decrease our supplies ref count and disable if required */
1439 if (rdev->supply)
1440 _regulator_disable(rdev->supply);
1441
1442 rdev->use_count = 0;
1443 return ret;
1444}
1445
1446/**
1447 * regulator_force_disable - force disable regulator output
1448 * @regulator: regulator source
1449 *
1450 * Forcibly disable the regulator output voltage or current.
1451 * NOTE: this *will* disable the regulator output even if other consumer
1452 * devices have it enabled. This should be used for situations when device
1453 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1454 */
1455int regulator_force_disable(struct regulator *regulator)
1456{
1457 int ret;
1458
1459 mutex_lock(&regulator->rdev->mutex);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001460 regulator->uA_load = 0;
1461 ret = _regulator_force_disable(regulator->rdev);
1462 mutex_unlock(&regulator->rdev->mutex);
1463 return ret;
1464}
1465EXPORT_SYMBOL_GPL(regulator_force_disable);
1466
1467static int _regulator_is_enabled(struct regulator_dev *rdev)
1468{
Mark Brown9a7f6a42010-02-11 17:22:45 +00001469 /* If we don't know then assume that the regulator is always on */
Mark Brown93325462009-08-03 18:49:56 +01001470 if (!rdev->desc->ops->is_enabled)
Mark Brown9a7f6a42010-02-11 17:22:45 +00001471 return 1;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001472
Mark Brown93325462009-08-03 18:49:56 +01001473 return rdev->desc->ops->is_enabled(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001474}
1475
1476/**
1477 * regulator_is_enabled - is the regulator output enabled
1478 * @regulator: regulator source
1479 *
David Brownell412aec62008-11-16 11:44:46 -08001480 * Returns positive if the regulator driver backing the source/client
1481 * has requested that the device be enabled, zero if it hasn't, else a
1482 * negative errno code.
1483 *
1484 * Note that the device backing this regulator handle can have multiple
1485 * users, so it might be enabled even if regulator_enable() was never
1486 * called for this particular source.
Liam Girdwood414c70c2008-04-30 15:59:04 +01001487 */
1488int regulator_is_enabled(struct regulator *regulator)
1489{
Mark Brown93325462009-08-03 18:49:56 +01001490 int ret;
1491
1492 mutex_lock(&regulator->rdev->mutex);
1493 ret = _regulator_is_enabled(regulator->rdev);
1494 mutex_unlock(&regulator->rdev->mutex);
1495
1496 return ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001497}
1498EXPORT_SYMBOL_GPL(regulator_is_enabled);
1499
1500/**
David Brownell4367cfd2009-02-26 11:48:36 -08001501 * regulator_count_voltages - count regulator_list_voltage() selectors
1502 * @regulator: regulator source
1503 *
1504 * Returns number of selectors, or negative errno. Selectors are
1505 * numbered starting at zero, and typically correspond to bitfields
1506 * in hardware registers.
1507 */
1508int regulator_count_voltages(struct regulator *regulator)
1509{
1510 struct regulator_dev *rdev = regulator->rdev;
1511
1512 return rdev->desc->n_voltages ? : -EINVAL;
1513}
1514EXPORT_SYMBOL_GPL(regulator_count_voltages);
1515
1516/**
1517 * regulator_list_voltage - enumerate supported voltages
1518 * @regulator: regulator source
1519 * @selector: identify voltage to list
1520 * Context: can sleep
1521 *
1522 * Returns a voltage that can be passed to @regulator_set_voltage(),
Thomas Weber88393162010-03-16 11:47:56 +01001523 * zero if this selector code can't be used on this system, or a
David Brownell4367cfd2009-02-26 11:48:36 -08001524 * negative errno.
1525 */
1526int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1527{
1528 struct regulator_dev *rdev = regulator->rdev;
1529 struct regulator_ops *ops = rdev->desc->ops;
1530 int ret;
1531
1532 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1533 return -EINVAL;
1534
1535 mutex_lock(&rdev->mutex);
1536 ret = ops->list_voltage(rdev, selector);
1537 mutex_unlock(&rdev->mutex);
1538
1539 if (ret > 0) {
1540 if (ret < rdev->constraints->min_uV)
1541 ret = 0;
1542 else if (ret > rdev->constraints->max_uV)
1543 ret = 0;
1544 }
1545
1546 return ret;
1547}
1548EXPORT_SYMBOL_GPL(regulator_list_voltage);
1549
1550/**
Mark Browna7a1ad92009-07-21 16:00:24 +01001551 * regulator_is_supported_voltage - check if a voltage range can be supported
1552 *
1553 * @regulator: Regulator to check.
1554 * @min_uV: Minimum required voltage in uV.
1555 * @max_uV: Maximum required voltage in uV.
1556 *
1557 * Returns a boolean or a negative error code.
1558 */
1559int regulator_is_supported_voltage(struct regulator *regulator,
1560 int min_uV, int max_uV)
1561{
1562 int i, voltages, ret;
1563
1564 ret = regulator_count_voltages(regulator);
1565 if (ret < 0)
1566 return ret;
1567 voltages = ret;
1568
1569 for (i = 0; i < voltages; i++) {
1570 ret = regulator_list_voltage(regulator, i);
1571
1572 if (ret >= min_uV && ret <= max_uV)
1573 return 1;
1574 }
1575
1576 return 0;
1577}
1578
1579/**
Liam Girdwood414c70c2008-04-30 15:59:04 +01001580 * regulator_set_voltage - set regulator output voltage
1581 * @regulator: regulator source
1582 * @min_uV: Minimum required voltage in uV
1583 * @max_uV: Maximum acceptable voltage in uV
1584 *
1585 * Sets a voltage regulator to the desired output voltage. This can be set
1586 * during any regulator state. IOW, regulator can be disabled or enabled.
1587 *
1588 * If the regulator is enabled then the voltage will change to the new value
1589 * immediately otherwise if the regulator is disabled the regulator will
1590 * output at the new voltage when enabled.
1591 *
1592 * NOTE: If the regulator is shared between several devices then the lowest
1593 * request voltage that meets the system constraints will be used.
Mark Brown69279fb2008-12-31 12:52:41 +00001594 * Regulator system constraints must be set for this regulator before
Liam Girdwood414c70c2008-04-30 15:59:04 +01001595 * calling this function otherwise this call will fail.
1596 */
1597int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1598{
1599 struct regulator_dev *rdev = regulator->rdev;
1600 int ret;
1601
1602 mutex_lock(&rdev->mutex);
1603
1604 /* sanity check */
1605 if (!rdev->desc->ops->set_voltage) {
1606 ret = -EINVAL;
1607 goto out;
1608 }
1609
1610 /* constraints check */
1611 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1612 if (ret < 0)
1613 goto out;
1614 regulator->min_uV = min_uV;
1615 regulator->max_uV = max_uV;
1616 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
1617
1618out:
Jonathan Cameronb136fb42009-01-19 18:20:58 +00001619 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001620 mutex_unlock(&rdev->mutex);
1621 return ret;
1622}
1623EXPORT_SYMBOL_GPL(regulator_set_voltage);
1624
1625static int _regulator_get_voltage(struct regulator_dev *rdev)
1626{
1627 /* sanity check */
1628 if (rdev->desc->ops->get_voltage)
1629 return rdev->desc->ops->get_voltage(rdev);
1630 else
1631 return -EINVAL;
1632}
1633
1634/**
1635 * regulator_get_voltage - get regulator output voltage
1636 * @regulator: regulator source
1637 *
1638 * This returns the current regulator voltage in uV.
1639 *
1640 * NOTE: If the regulator is disabled it will return the voltage value. This
1641 * function should not be used to determine regulator state.
1642 */
1643int regulator_get_voltage(struct regulator *regulator)
1644{
1645 int ret;
1646
1647 mutex_lock(&regulator->rdev->mutex);
1648
1649 ret = _regulator_get_voltage(regulator->rdev);
1650
1651 mutex_unlock(&regulator->rdev->mutex);
1652
1653 return ret;
1654}
1655EXPORT_SYMBOL_GPL(regulator_get_voltage);
1656
1657/**
1658 * regulator_set_current_limit - set regulator output current limit
1659 * @regulator: regulator source
1660 * @min_uA: Minimuum supported current in uA
1661 * @max_uA: Maximum supported current in uA
1662 *
1663 * Sets current sink to the desired output current. This can be set during
1664 * any regulator state. IOW, regulator can be disabled or enabled.
1665 *
1666 * If the regulator is enabled then the current will change to the new value
1667 * immediately otherwise if the regulator is disabled the regulator will
1668 * output at the new current when enabled.
1669 *
1670 * NOTE: Regulator system constraints must be set for this regulator before
1671 * calling this function otherwise this call will fail.
1672 */
1673int regulator_set_current_limit(struct regulator *regulator,
1674 int min_uA, int max_uA)
1675{
1676 struct regulator_dev *rdev = regulator->rdev;
1677 int ret;
1678
1679 mutex_lock(&rdev->mutex);
1680
1681 /* sanity check */
1682 if (!rdev->desc->ops->set_current_limit) {
1683 ret = -EINVAL;
1684 goto out;
1685 }
1686
1687 /* constraints check */
1688 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1689 if (ret < 0)
1690 goto out;
1691
1692 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1693out:
1694 mutex_unlock(&rdev->mutex);
1695 return ret;
1696}
1697EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1698
1699static int _regulator_get_current_limit(struct regulator_dev *rdev)
1700{
1701 int ret;
1702
1703 mutex_lock(&rdev->mutex);
1704
1705 /* sanity check */
1706 if (!rdev->desc->ops->get_current_limit) {
1707 ret = -EINVAL;
1708 goto out;
1709 }
1710
1711 ret = rdev->desc->ops->get_current_limit(rdev);
1712out:
1713 mutex_unlock(&rdev->mutex);
1714 return ret;
1715}
1716
1717/**
1718 * regulator_get_current_limit - get regulator output current
1719 * @regulator: regulator source
1720 *
1721 * This returns the current supplied by the specified current sink in uA.
1722 *
1723 * NOTE: If the regulator is disabled it will return the current value. This
1724 * function should not be used to determine regulator state.
1725 */
1726int regulator_get_current_limit(struct regulator *regulator)
1727{
1728 return _regulator_get_current_limit(regulator->rdev);
1729}
1730EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1731
1732/**
1733 * regulator_set_mode - set regulator operating mode
1734 * @regulator: regulator source
1735 * @mode: operating mode - one of the REGULATOR_MODE constants
1736 *
1737 * Set regulator operating mode to increase regulator efficiency or improve
1738 * regulation performance.
1739 *
1740 * NOTE: Regulator system constraints must be set for this regulator before
1741 * calling this function otherwise this call will fail.
1742 */
1743int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1744{
1745 struct regulator_dev *rdev = regulator->rdev;
1746 int ret;
Sundar R Iyer500b4ac2010-05-17 21:24:48 +05301747 int regulator_curr_mode;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001748
1749 mutex_lock(&rdev->mutex);
1750
1751 /* sanity check */
1752 if (!rdev->desc->ops->set_mode) {
1753 ret = -EINVAL;
1754 goto out;
1755 }
1756
Sundar R Iyer500b4ac2010-05-17 21:24:48 +05301757 /* return if the same mode is requested */
1758 if (rdev->desc->ops->get_mode) {
1759 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
1760 if (regulator_curr_mode == mode) {
1761 ret = 0;
1762 goto out;
1763 }
1764 }
1765
Liam Girdwood414c70c2008-04-30 15:59:04 +01001766 /* constraints check */
1767 ret = regulator_check_mode(rdev, mode);
1768 if (ret < 0)
1769 goto out;
1770
1771 ret = rdev->desc->ops->set_mode(rdev, mode);
1772out:
1773 mutex_unlock(&rdev->mutex);
1774 return ret;
1775}
1776EXPORT_SYMBOL_GPL(regulator_set_mode);
1777
1778static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
1779{
1780 int ret;
1781
1782 mutex_lock(&rdev->mutex);
1783
1784 /* sanity check */
1785 if (!rdev->desc->ops->get_mode) {
1786 ret = -EINVAL;
1787 goto out;
1788 }
1789
1790 ret = rdev->desc->ops->get_mode(rdev);
1791out:
1792 mutex_unlock(&rdev->mutex);
1793 return ret;
1794}
1795
1796/**
1797 * regulator_get_mode - get regulator operating mode
1798 * @regulator: regulator source
1799 *
1800 * Get the current regulator operating mode.
1801 */
1802unsigned int regulator_get_mode(struct regulator *regulator)
1803{
1804 return _regulator_get_mode(regulator->rdev);
1805}
1806EXPORT_SYMBOL_GPL(regulator_get_mode);
1807
1808/**
1809 * regulator_set_optimum_mode - set regulator optimum operating mode
1810 * @regulator: regulator source
1811 * @uA_load: load current
1812 *
1813 * Notifies the regulator core of a new device load. This is then used by
1814 * DRMS (if enabled by constraints) to set the most efficient regulator
1815 * operating mode for the new regulator loading.
1816 *
1817 * Consumer devices notify their supply regulator of the maximum power
1818 * they will require (can be taken from device datasheet in the power
1819 * consumption tables) when they change operational status and hence power
1820 * state. Examples of operational state changes that can affect power
1821 * consumption are :-
1822 *
1823 * o Device is opened / closed.
1824 * o Device I/O is about to begin or has just finished.
1825 * o Device is idling in between work.
1826 *
1827 * This information is also exported via sysfs to userspace.
1828 *
1829 * DRMS will sum the total requested load on the regulator and change
1830 * to the most efficient operating mode if platform constraints allow.
1831 *
1832 * Returns the new regulator mode or error.
1833 */
1834int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
1835{
1836 struct regulator_dev *rdev = regulator->rdev;
1837 struct regulator *consumer;
1838 int ret, output_uV, input_uV, total_uA_load = 0;
1839 unsigned int mode;
1840
1841 mutex_lock(&rdev->mutex);
1842
1843 regulator->uA_load = uA_load;
1844 ret = regulator_check_drms(rdev);
1845 if (ret < 0)
1846 goto out;
1847 ret = -EINVAL;
1848
1849 /* sanity check */
1850 if (!rdev->desc->ops->get_optimum_mode)
1851 goto out;
1852
1853 /* get output voltage */
1854 output_uV = rdev->desc->ops->get_voltage(rdev);
1855 if (output_uV <= 0) {
1856 printk(KERN_ERR "%s: invalid output voltage found for %s\n",
Mark Brown1083c392009-10-22 16:31:32 +01001857 __func__, rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +01001858 goto out;
1859 }
1860
1861 /* get input voltage */
1862 if (rdev->supply && rdev->supply->desc->ops->get_voltage)
1863 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
1864 else
1865 input_uV = rdev->constraints->input_uV;
1866 if (input_uV <= 0) {
1867 printk(KERN_ERR "%s: invalid input voltage found for %s\n",
Mark Brown1083c392009-10-22 16:31:32 +01001868 __func__, rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +01001869 goto out;
1870 }
1871
1872 /* calc total requested load for this regulator */
1873 list_for_each_entry(consumer, &rdev->consumer_list, list)
Stefan Roesefa2984d2009-11-27 15:56:34 +01001874 total_uA_load += consumer->uA_load;
Liam Girdwood414c70c2008-04-30 15:59:04 +01001875
1876 mode = rdev->desc->ops->get_optimum_mode(rdev,
1877 input_uV, output_uV,
1878 total_uA_load);
David Brownelle5735202008-11-16 11:46:56 -08001879 ret = regulator_check_mode(rdev, mode);
1880 if (ret < 0) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01001881 printk(KERN_ERR "%s: failed to get optimum mode for %s @"
Mark Brown1083c392009-10-22 16:31:32 +01001882 " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev),
Liam Girdwood414c70c2008-04-30 15:59:04 +01001883 total_uA_load, input_uV, output_uV);
1884 goto out;
1885 }
1886
1887 ret = rdev->desc->ops->set_mode(rdev, mode);
David Brownelle5735202008-11-16 11:46:56 -08001888 if (ret < 0) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01001889 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n",
Mark Brown1083c392009-10-22 16:31:32 +01001890 __func__, mode, rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +01001891 goto out;
1892 }
1893 ret = mode;
1894out:
1895 mutex_unlock(&rdev->mutex);
1896 return ret;
1897}
1898EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
1899
1900/**
1901 * regulator_register_notifier - register regulator event notifier
1902 * @regulator: regulator source
Mark Brown69279fb2008-12-31 12:52:41 +00001903 * @nb: notifier block
Liam Girdwood414c70c2008-04-30 15:59:04 +01001904 *
1905 * Register notifier block to receive regulator events.
1906 */
1907int regulator_register_notifier(struct regulator *regulator,
1908 struct notifier_block *nb)
1909{
1910 return blocking_notifier_chain_register(&regulator->rdev->notifier,
1911 nb);
1912}
1913EXPORT_SYMBOL_GPL(regulator_register_notifier);
1914
1915/**
1916 * regulator_unregister_notifier - unregister regulator event notifier
1917 * @regulator: regulator source
Mark Brown69279fb2008-12-31 12:52:41 +00001918 * @nb: notifier block
Liam Girdwood414c70c2008-04-30 15:59:04 +01001919 *
1920 * Unregister regulator event notifier block.
1921 */
1922int regulator_unregister_notifier(struct regulator *regulator,
1923 struct notifier_block *nb)
1924{
1925 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
1926 nb);
1927}
1928EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
1929
Jonathan Cameronb136fb42009-01-19 18:20:58 +00001930/* notify regulator consumers and downstream regulator consumers.
1931 * Note mutex must be held by caller.
1932 */
Liam Girdwood414c70c2008-04-30 15:59:04 +01001933static void _notifier_call_chain(struct regulator_dev *rdev,
1934 unsigned long event, void *data)
1935{
1936 struct regulator_dev *_rdev;
1937
1938 /* call rdev chain first */
Liam Girdwood414c70c2008-04-30 15:59:04 +01001939 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001940
1941 /* now notify regulator we supply */
Jonathan Cameronb136fb42009-01-19 18:20:58 +00001942 list_for_each_entry(_rdev, &rdev->supply_list, slist) {
Stefan Roesefa2984d2009-11-27 15:56:34 +01001943 mutex_lock(&_rdev->mutex);
1944 _notifier_call_chain(_rdev, event, data);
1945 mutex_unlock(&_rdev->mutex);
Jonathan Cameronb136fb42009-01-19 18:20:58 +00001946 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01001947}
1948
1949/**
1950 * regulator_bulk_get - get multiple regulator consumers
1951 *
1952 * @dev: Device to supply
1953 * @num_consumers: Number of consumers to register
1954 * @consumers: Configuration of consumers; clients are stored here.
1955 *
1956 * @return 0 on success, an errno on failure.
1957 *
1958 * This helper function allows drivers to get several regulator
1959 * consumers in one operation. If any of the regulators cannot be
1960 * acquired then any regulators that were allocated will be freed
1961 * before returning to the caller.
1962 */
1963int regulator_bulk_get(struct device *dev, int num_consumers,
1964 struct regulator_bulk_data *consumers)
1965{
1966 int i;
1967 int ret;
1968
1969 for (i = 0; i < num_consumers; i++)
1970 consumers[i].consumer = NULL;
1971
1972 for (i = 0; i < num_consumers; i++) {
1973 consumers[i].consumer = regulator_get(dev,
1974 consumers[i].supply);
1975 if (IS_ERR(consumers[i].consumer)) {
Liam Girdwood414c70c2008-04-30 15:59:04 +01001976 ret = PTR_ERR(consumers[i].consumer);
Mark Brown5b307622009-10-13 13:06:49 +01001977 dev_err(dev, "Failed to get supply '%s': %d\n",
1978 consumers[i].supply, ret);
Liam Girdwood414c70c2008-04-30 15:59:04 +01001979 consumers[i].consumer = NULL;
1980 goto err;
1981 }
1982 }
1983
1984 return 0;
1985
1986err:
1987 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
1988 regulator_put(consumers[i].consumer);
1989
1990 return ret;
1991}
1992EXPORT_SYMBOL_GPL(regulator_bulk_get);
1993
1994/**
1995 * regulator_bulk_enable - enable multiple regulator consumers
1996 *
1997 * @num_consumers: Number of consumers
1998 * @consumers: Consumer data; clients are stored here.
1999 * @return 0 on success, an errno on failure
2000 *
2001 * This convenience API allows consumers to enable multiple regulator
2002 * clients in a single API call. If any consumers cannot be enabled
2003 * then any others that were enabled will be disabled again prior to
2004 * return.
2005 */
2006int regulator_bulk_enable(int num_consumers,
2007 struct regulator_bulk_data *consumers)
2008{
2009 int i;
2010 int ret;
2011
2012 for (i = 0; i < num_consumers; i++) {
2013 ret = regulator_enable(consumers[i].consumer);
2014 if (ret != 0)
2015 goto err;
2016 }
2017
2018 return 0;
2019
2020err:
Mark Brown5b307622009-10-13 13:06:49 +01002021 printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret);
Lars-Peter Clauseneb143ac2009-12-15 14:30:01 +01002022 for (--i; i >= 0; --i)
Liam Girdwood414c70c2008-04-30 15:59:04 +01002023 regulator_disable(consumers[i].consumer);
2024
2025 return ret;
2026}
2027EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2028
2029/**
2030 * regulator_bulk_disable - disable multiple regulator consumers
2031 *
2032 * @num_consumers: Number of consumers
2033 * @consumers: Consumer data; clients are stored here.
2034 * @return 0 on success, an errno on failure
2035 *
2036 * This convenience API allows consumers to disable multiple regulator
2037 * clients in a single API call. If any consumers cannot be enabled
2038 * then any others that were disabled will be disabled again prior to
2039 * return.
2040 */
2041int regulator_bulk_disable(int num_consumers,
2042 struct regulator_bulk_data *consumers)
2043{
2044 int i;
2045 int ret;
2046
2047 for (i = 0; i < num_consumers; i++) {
2048 ret = regulator_disable(consumers[i].consumer);
2049 if (ret != 0)
2050 goto err;
2051 }
2052
2053 return 0;
2054
2055err:
Mark Brown5b307622009-10-13 13:06:49 +01002056 printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply,
2057 ret);
Lars-Peter Clauseneb143ac2009-12-15 14:30:01 +01002058 for (--i; i >= 0; --i)
Liam Girdwood414c70c2008-04-30 15:59:04 +01002059 regulator_enable(consumers[i].consumer);
2060
2061 return ret;
2062}
2063EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2064
2065/**
2066 * regulator_bulk_free - free multiple regulator consumers
2067 *
2068 * @num_consumers: Number of consumers
2069 * @consumers: Consumer data; clients are stored here.
2070 *
2071 * This convenience API allows consumers to free multiple regulator
2072 * clients in a single API call.
2073 */
2074void regulator_bulk_free(int num_consumers,
2075 struct regulator_bulk_data *consumers)
2076{
2077 int i;
2078
2079 for (i = 0; i < num_consumers; i++) {
2080 regulator_put(consumers[i].consumer);
2081 consumers[i].consumer = NULL;
2082 }
2083}
2084EXPORT_SYMBOL_GPL(regulator_bulk_free);
2085
2086/**
2087 * regulator_notifier_call_chain - call regulator event notifier
Mark Brown69279fb2008-12-31 12:52:41 +00002088 * @rdev: regulator source
Liam Girdwood414c70c2008-04-30 15:59:04 +01002089 * @event: notifier block
Mark Brown69279fb2008-12-31 12:52:41 +00002090 * @data: callback-specific data.
Liam Girdwood414c70c2008-04-30 15:59:04 +01002091 *
2092 * Called by regulator drivers to notify clients a regulator event has
2093 * occurred. We also notify regulator clients downstream.
Jonathan Cameronb136fb42009-01-19 18:20:58 +00002094 * Note lock must be held by caller.
Liam Girdwood414c70c2008-04-30 15:59:04 +01002095 */
2096int regulator_notifier_call_chain(struct regulator_dev *rdev,
2097 unsigned long event, void *data)
2098{
2099 _notifier_call_chain(rdev, event, data);
2100 return NOTIFY_DONE;
2101
2102}
2103EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2104
Mark Brownbe721972009-08-04 20:09:52 +02002105/**
2106 * regulator_mode_to_status - convert a regulator mode into a status
2107 *
2108 * @mode: Mode to convert
2109 *
2110 * Convert a regulator mode into a status.
2111 */
2112int regulator_mode_to_status(unsigned int mode)
2113{
2114 switch (mode) {
2115 case REGULATOR_MODE_FAST:
2116 return REGULATOR_STATUS_FAST;
2117 case REGULATOR_MODE_NORMAL:
2118 return REGULATOR_STATUS_NORMAL;
2119 case REGULATOR_MODE_IDLE:
2120 return REGULATOR_STATUS_IDLE;
2121 case REGULATOR_STATUS_STANDBY:
2122 return REGULATOR_STATUS_STANDBY;
2123 default:
2124 return 0;
2125 }
2126}
2127EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2128
David Brownell7ad68e22008-11-11 17:39:02 -08002129/*
2130 * To avoid cluttering sysfs (and memory) with useless state, only
2131 * create attributes that can be meaningfully displayed.
2132 */
2133static int add_regulator_attributes(struct regulator_dev *rdev)
2134{
2135 struct device *dev = &rdev->dev;
2136 struct regulator_ops *ops = rdev->desc->ops;
2137 int status = 0;
2138
2139 /* some attributes need specific methods to be displayed */
2140 if (ops->get_voltage) {
2141 status = device_create_file(dev, &dev_attr_microvolts);
2142 if (status < 0)
2143 return status;
2144 }
2145 if (ops->get_current_limit) {
2146 status = device_create_file(dev, &dev_attr_microamps);
2147 if (status < 0)
2148 return status;
2149 }
2150 if (ops->get_mode) {
2151 status = device_create_file(dev, &dev_attr_opmode);
2152 if (status < 0)
2153 return status;
2154 }
2155 if (ops->is_enabled) {
2156 status = device_create_file(dev, &dev_attr_state);
2157 if (status < 0)
2158 return status;
2159 }
David Brownell853116a2009-01-14 23:03:17 -08002160 if (ops->get_status) {
2161 status = device_create_file(dev, &dev_attr_status);
2162 if (status < 0)
2163 return status;
2164 }
David Brownell7ad68e22008-11-11 17:39:02 -08002165
2166 /* some attributes are type-specific */
2167 if (rdev->desc->type == REGULATOR_CURRENT) {
2168 status = device_create_file(dev, &dev_attr_requested_microamps);
2169 if (status < 0)
2170 return status;
2171 }
2172
2173 /* all the other attributes exist to support constraints;
2174 * don't show them if there are no constraints, or if the
2175 * relevant supporting methods are missing.
2176 */
2177 if (!rdev->constraints)
2178 return status;
2179
2180 /* constraints need specific supporting methods */
2181 if (ops->set_voltage) {
2182 status = device_create_file(dev, &dev_attr_min_microvolts);
2183 if (status < 0)
2184 return status;
2185 status = device_create_file(dev, &dev_attr_max_microvolts);
2186 if (status < 0)
2187 return status;
2188 }
2189 if (ops->set_current_limit) {
2190 status = device_create_file(dev, &dev_attr_min_microamps);
2191 if (status < 0)
2192 return status;
2193 status = device_create_file(dev, &dev_attr_max_microamps);
2194 if (status < 0)
2195 return status;
2196 }
2197
2198 /* suspend mode constraints need multiple supporting methods */
2199 if (!(ops->set_suspend_enable && ops->set_suspend_disable))
2200 return status;
2201
2202 status = device_create_file(dev, &dev_attr_suspend_standby_state);
2203 if (status < 0)
2204 return status;
2205 status = device_create_file(dev, &dev_attr_suspend_mem_state);
2206 if (status < 0)
2207 return status;
2208 status = device_create_file(dev, &dev_attr_suspend_disk_state);
2209 if (status < 0)
2210 return status;
2211
2212 if (ops->set_suspend_voltage) {
2213 status = device_create_file(dev,
2214 &dev_attr_suspend_standby_microvolts);
2215 if (status < 0)
2216 return status;
2217 status = device_create_file(dev,
2218 &dev_attr_suspend_mem_microvolts);
2219 if (status < 0)
2220 return status;
2221 status = device_create_file(dev,
2222 &dev_attr_suspend_disk_microvolts);
2223 if (status < 0)
2224 return status;
2225 }
2226
2227 if (ops->set_suspend_mode) {
2228 status = device_create_file(dev,
2229 &dev_attr_suspend_standby_mode);
2230 if (status < 0)
2231 return status;
2232 status = device_create_file(dev,
2233 &dev_attr_suspend_mem_mode);
2234 if (status < 0)
2235 return status;
2236 status = device_create_file(dev,
2237 &dev_attr_suspend_disk_mode);
2238 if (status < 0)
2239 return status;
2240 }
2241
2242 return status;
2243}
2244
Liam Girdwood414c70c2008-04-30 15:59:04 +01002245/**
2246 * regulator_register - register regulator
Mark Brown69279fb2008-12-31 12:52:41 +00002247 * @regulator_desc: regulator to register
2248 * @dev: struct device for the regulator
Mark Brown05271002009-01-19 13:37:02 +00002249 * @init_data: platform provided init data, passed through by driver
Mark Brown69279fb2008-12-31 12:52:41 +00002250 * @driver_data: private regulator data
Liam Girdwood414c70c2008-04-30 15:59:04 +01002251 *
2252 * Called by regulator drivers to register a regulator.
2253 * Returns 0 on success.
2254 */
2255struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
Mark Brown05271002009-01-19 13:37:02 +00002256 struct device *dev, struct regulator_init_data *init_data,
2257 void *driver_data)
Liam Girdwood414c70c2008-04-30 15:59:04 +01002258{
2259 static atomic_t regulator_no = ATOMIC_INIT(0);
2260 struct regulator_dev *rdev;
Liam Girdwooda5766f12008-10-10 13:22:20 +01002261 int ret, i;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002262
2263 if (regulator_desc == NULL)
2264 return ERR_PTR(-EINVAL);
2265
2266 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2267 return ERR_PTR(-EINVAL);
2268
Diego Lizierocd78dfc2009-04-14 03:04:47 +02002269 if (regulator_desc->type != REGULATOR_VOLTAGE &&
2270 regulator_desc->type != REGULATOR_CURRENT)
Liam Girdwood414c70c2008-04-30 15:59:04 +01002271 return ERR_PTR(-EINVAL);
2272
Mark Brown46fabe1e2008-09-09 16:21:18 +01002273 if (!init_data)
2274 return ERR_PTR(-EINVAL);
2275
Liam Girdwood414c70c2008-04-30 15:59:04 +01002276 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2277 if (rdev == NULL)
2278 return ERR_PTR(-ENOMEM);
2279
2280 mutex_lock(&regulator_list_mutex);
2281
2282 mutex_init(&rdev->mutex);
Liam Girdwooda5766f12008-10-10 13:22:20 +01002283 rdev->reg_data = driver_data;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002284 rdev->owner = regulator_desc->owner;
2285 rdev->desc = regulator_desc;
2286 INIT_LIST_HEAD(&rdev->consumer_list);
2287 INIT_LIST_HEAD(&rdev->supply_list);
2288 INIT_LIST_HEAD(&rdev->list);
2289 INIT_LIST_HEAD(&rdev->slist);
2290 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2291
Liam Girdwooda5766f12008-10-10 13:22:20 +01002292 /* preform any regulator specific init */
2293 if (init_data->regulator_init) {
2294 ret = init_data->regulator_init(rdev->reg_data);
David Brownell4fca9542008-11-11 17:38:53 -08002295 if (ret < 0)
2296 goto clean;
Liam Girdwooda5766f12008-10-10 13:22:20 +01002297 }
Liam Girdwood414c70c2008-04-30 15:59:04 +01002298
Liam Girdwooda5766f12008-10-10 13:22:20 +01002299 /* register with sysfs */
2300 rdev->dev.class = &regulator_class;
2301 rdev->dev.parent = dev;
Kay Sievers812460a2008-11-02 03:55:10 +01002302 dev_set_name(&rdev->dev, "regulator.%d",
2303 atomic_inc_return(&regulator_no) - 1);
Liam Girdwooda5766f12008-10-10 13:22:20 +01002304 ret = device_register(&rdev->dev);
David Brownell4fca9542008-11-11 17:38:53 -08002305 if (ret != 0)
2306 goto clean;
Liam Girdwooda5766f12008-10-10 13:22:20 +01002307
2308 dev_set_drvdata(&rdev->dev, rdev);
2309
Mike Rapoport74f544c2008-11-25 14:53:53 +02002310 /* set regulator constraints */
2311 ret = set_machine_constraints(rdev, &init_data->constraints);
2312 if (ret < 0)
2313 goto scrub;
2314
David Brownell7ad68e22008-11-11 17:39:02 -08002315 /* add attributes supported by this regulator */
2316 ret = add_regulator_attributes(rdev);
2317 if (ret < 0)
2318 goto scrub;
2319
Liam Girdwooda5766f12008-10-10 13:22:20 +01002320 /* set supply regulator if it exists */
Mark Brown0178f3e2010-04-26 15:18:14 +01002321 if (init_data->supply_regulator && init_data->supply_regulator_dev) {
2322 dev_err(dev,
2323 "Supply regulator specified by both name and dev\n");
2324 goto scrub;
2325 }
2326
2327 if (init_data->supply_regulator) {
2328 struct regulator_dev *r;
2329 int found = 0;
2330
2331 list_for_each_entry(r, &regulator_list, list) {
2332 if (strcmp(rdev_get_name(r),
2333 init_data->supply_regulator) == 0) {
2334 found = 1;
2335 break;
2336 }
2337 }
2338
2339 if (!found) {
2340 dev_err(dev, "Failed to find supply %s\n",
2341 init_data->supply_regulator);
2342 goto scrub;
2343 }
2344
2345 ret = set_supply(rdev, r);
2346 if (ret < 0)
2347 goto scrub;
2348 }
2349
Liam Girdwooda5766f12008-10-10 13:22:20 +01002350 if (init_data->supply_regulator_dev) {
Mark Brown0178f3e2010-04-26 15:18:14 +01002351 dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n");
Liam Girdwooda5766f12008-10-10 13:22:20 +01002352 ret = set_supply(rdev,
2353 dev_get_drvdata(init_data->supply_regulator_dev));
David Brownell4fca9542008-11-11 17:38:53 -08002354 if (ret < 0)
2355 goto scrub;
Liam Girdwooda5766f12008-10-10 13:22:20 +01002356 }
2357
2358 /* add consumers devices */
2359 for (i = 0; i < init_data->num_consumer_supplies; i++) {
2360 ret = set_consumer_device_supply(rdev,
2361 init_data->consumer_supplies[i].dev,
Mark Brown40f92442009-06-17 17:56:39 +01002362 init_data->consumer_supplies[i].dev_name,
Liam Girdwooda5766f12008-10-10 13:22:20 +01002363 init_data->consumer_supplies[i].supply);
Jani Nikulad4033b52010-04-29 10:55:11 +03002364 if (ret < 0)
2365 goto unset_supplies;
Liam Girdwooda5766f12008-10-10 13:22:20 +01002366 }
2367
2368 list_add(&rdev->list, &regulator_list);
2369out:
Liam Girdwood414c70c2008-04-30 15:59:04 +01002370 mutex_unlock(&regulator_list_mutex);
2371 return rdev;
David Brownell4fca9542008-11-11 17:38:53 -08002372
Jani Nikulad4033b52010-04-29 10:55:11 +03002373unset_supplies:
2374 unset_regulator_supplies(rdev);
2375
David Brownell4fca9542008-11-11 17:38:53 -08002376scrub:
2377 device_unregister(&rdev->dev);
Paul Walmsley53032da2009-04-25 05:28:36 -06002378 /* device core frees rdev */
2379 rdev = ERR_PTR(ret);
2380 goto out;
2381
David Brownell4fca9542008-11-11 17:38:53 -08002382clean:
2383 kfree(rdev);
2384 rdev = ERR_PTR(ret);
2385 goto out;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002386}
2387EXPORT_SYMBOL_GPL(regulator_register);
2388
2389/**
2390 * regulator_unregister - unregister regulator
Mark Brown69279fb2008-12-31 12:52:41 +00002391 * @rdev: regulator to unregister
Liam Girdwood414c70c2008-04-30 15:59:04 +01002392 *
2393 * Called by regulator drivers to unregister a regulator.
2394 */
2395void regulator_unregister(struct regulator_dev *rdev)
2396{
2397 if (rdev == NULL)
2398 return;
2399
2400 mutex_lock(&regulator_list_mutex);
Mark Brown6bf87d12009-07-21 16:00:25 +01002401 WARN_ON(rdev->open_count);
Mike Rapoport0f1d7472009-01-22 16:00:29 +02002402 unset_regulator_supplies(rdev);
Liam Girdwood414c70c2008-04-30 15:59:04 +01002403 list_del(&rdev->list);
2404 if (rdev->supply)
2405 sysfs_remove_link(&rdev->dev.kobj, "supply");
2406 device_unregister(&rdev->dev);
2407 mutex_unlock(&regulator_list_mutex);
2408}
2409EXPORT_SYMBOL_GPL(regulator_unregister);
2410
2411/**
Mark Browncf7bbcd2008-12-31 12:52:43 +00002412 * regulator_suspend_prepare - prepare regulators for system wide suspend
Liam Girdwood414c70c2008-04-30 15:59:04 +01002413 * @state: system suspend state
2414 *
2415 * Configure each regulator with it's suspend operating parameters for state.
2416 * This will usually be called by machine suspend code prior to supending.
2417 */
2418int regulator_suspend_prepare(suspend_state_t state)
2419{
2420 struct regulator_dev *rdev;
2421 int ret = 0;
2422
2423 /* ON is handled by regulator active state */
2424 if (state == PM_SUSPEND_ON)
2425 return -EINVAL;
2426
2427 mutex_lock(&regulator_list_mutex);
2428 list_for_each_entry(rdev, &regulator_list, list) {
2429
2430 mutex_lock(&rdev->mutex);
2431 ret = suspend_prepare(rdev, state);
2432 mutex_unlock(&rdev->mutex);
2433
2434 if (ret < 0) {
2435 printk(KERN_ERR "%s: failed to prepare %s\n",
Mark Brown1083c392009-10-22 16:31:32 +01002436 __func__, rdev_get_name(rdev));
Liam Girdwood414c70c2008-04-30 15:59:04 +01002437 goto out;
2438 }
2439 }
2440out:
2441 mutex_unlock(&regulator_list_mutex);
2442 return ret;
2443}
2444EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2445
2446/**
Mark Brownca725562009-03-16 19:36:34 +00002447 * regulator_has_full_constraints - the system has fully specified constraints
2448 *
2449 * Calling this function will cause the regulator API to disable all
2450 * regulators which have a zero use count and don't have an always_on
2451 * constraint in a late_initcall.
2452 *
2453 * The intention is that this will become the default behaviour in a
2454 * future kernel release so users are encouraged to use this facility
2455 * now.
2456 */
2457void regulator_has_full_constraints(void)
2458{
2459 has_full_constraints = 1;
2460}
2461EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
2462
2463/**
Liam Girdwood414c70c2008-04-30 15:59:04 +01002464 * rdev_get_drvdata - get rdev regulator driver data
Mark Brown69279fb2008-12-31 12:52:41 +00002465 * @rdev: regulator
Liam Girdwood414c70c2008-04-30 15:59:04 +01002466 *
2467 * Get rdev regulator driver private data. This call can be used in the
2468 * regulator driver context.
2469 */
2470void *rdev_get_drvdata(struct regulator_dev *rdev)
2471{
2472 return rdev->reg_data;
2473}
2474EXPORT_SYMBOL_GPL(rdev_get_drvdata);
2475
2476/**
2477 * regulator_get_drvdata - get regulator driver data
2478 * @regulator: regulator
2479 *
2480 * Get regulator driver private data. This call can be used in the consumer
2481 * driver context when non API regulator specific functions need to be called.
2482 */
2483void *regulator_get_drvdata(struct regulator *regulator)
2484{
2485 return regulator->rdev->reg_data;
2486}
2487EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2488
2489/**
2490 * regulator_set_drvdata - set regulator driver data
2491 * @regulator: regulator
2492 * @data: data
2493 */
2494void regulator_set_drvdata(struct regulator *regulator, void *data)
2495{
2496 regulator->rdev->reg_data = data;
2497}
2498EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2499
2500/**
2501 * regulator_get_id - get regulator ID
Mark Brown69279fb2008-12-31 12:52:41 +00002502 * @rdev: regulator
Liam Girdwood414c70c2008-04-30 15:59:04 +01002503 */
2504int rdev_get_id(struct regulator_dev *rdev)
2505{
2506 return rdev->desc->id;
2507}
2508EXPORT_SYMBOL_GPL(rdev_get_id);
2509
Liam Girdwooda5766f12008-10-10 13:22:20 +01002510struct device *rdev_get_dev(struct regulator_dev *rdev)
2511{
2512 return &rdev->dev;
2513}
2514EXPORT_SYMBOL_GPL(rdev_get_dev);
2515
2516void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2517{
2518 return reg_init_data->driver_data;
2519}
2520EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2521
Liam Girdwood414c70c2008-04-30 15:59:04 +01002522static int __init regulator_init(void)
2523{
Mark Brown34abbd62010-02-12 10:18:08 +00002524 int ret;
2525
Liam Girdwood414c70c2008-04-30 15:59:04 +01002526 printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION);
Mark Brown34abbd62010-02-12 10:18:08 +00002527
2528 ret = class_register(&regulator_class);
2529
2530 regulator_dummy_init();
2531
2532 return ret;
Liam Girdwood414c70c2008-04-30 15:59:04 +01002533}
2534
2535/* init early to allow our consumers to complete system booting */
2536core_initcall(regulator_init);
Mark Brownca725562009-03-16 19:36:34 +00002537
2538static int __init regulator_init_complete(void)
2539{
2540 struct regulator_dev *rdev;
2541 struct regulator_ops *ops;
2542 struct regulation_constraints *c;
2543 int enabled, ret;
2544 const char *name;
2545
2546 mutex_lock(&regulator_list_mutex);
2547
2548 /* If we have a full configuration then disable any regulators
2549 * which are not in use or always_on. This will become the
2550 * default behaviour in the future.
2551 */
2552 list_for_each_entry(rdev, &regulator_list, list) {
2553 ops = rdev->desc->ops;
2554 c = rdev->constraints;
2555
Mark Brown1083c392009-10-22 16:31:32 +01002556 name = rdev_get_name(rdev);
Mark Brownca725562009-03-16 19:36:34 +00002557
Mark Brownf25e0b42009-08-03 18:49:55 +01002558 if (!ops->disable || (c && c->always_on))
Mark Brownca725562009-03-16 19:36:34 +00002559 continue;
2560
2561 mutex_lock(&rdev->mutex);
2562
2563 if (rdev->use_count)
2564 goto unlock;
2565
2566 /* If we can't read the status assume it's on. */
2567 if (ops->is_enabled)
2568 enabled = ops->is_enabled(rdev);
2569 else
2570 enabled = 1;
2571
2572 if (!enabled)
2573 goto unlock;
2574
2575 if (has_full_constraints) {
2576 /* We log since this may kill the system if it
2577 * goes wrong. */
2578 printk(KERN_INFO "%s: disabling %s\n",
2579 __func__, name);
2580 ret = ops->disable(rdev);
2581 if (ret != 0) {
2582 printk(KERN_ERR
2583 "%s: couldn't disable %s: %d\n",
2584 __func__, name, ret);
2585 }
2586 } else {
2587 /* The intention is that in future we will
2588 * assume that full constraints are provided
2589 * so warn even if we aren't going to do
2590 * anything here.
2591 */
2592 printk(KERN_WARNING
2593 "%s: incomplete constraints, leaving %s on\n",
2594 __func__, name);
2595 }
2596
2597unlock:
2598 mutex_unlock(&rdev->mutex);
2599 }
2600
2601 mutex_unlock(&regulator_list_mutex);
2602
2603 return 0;
2604}
2605late_initcall(regulator_init_complete);