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regulator: Add system_load constraint
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / regulator / core.c
CommitLineData
414c70cb
LG		 1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
a5766f11 5 * Copyright 2008 SlimLogic Ltd.
414c70cb 6 *
a5766f11 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
414c70cb
LG		 8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
1130e5b3 18#include <linux/debugfs.h>
414c70cb 19#include <linux/device.h>
5a0e3ad6 20#include <linux/slab.h>
f21e0e81 21#include <linux/async.h>
414c70cb
LG		 22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
31aae2be 25#include <linux/delay.h>
65f73508 26#include <linux/gpio.h>
778b28b4 27#include <linux/gpio/consumer.h>
69511a45 28#include <linux/of.h>
65b19ce6 29#include <linux/regmap.h>
69511a45 30#include <linux/regulator/of_regulator.h>
414c70cb
LG		 31#include <linux/regulator/consumer.h>
32#include <linux/regulator/driver.h>
33#include <linux/regulator/machine.h>
65602c32 34#include <linux/module.h>
414c70cb 35
02fa3ec0
MB		 36#define CREATE_TRACE_POINTS
37#include <trace/events/regulator.h>
38
34abbd68 39#include "dummy.h"
0cdfcc0f 40#include "internal.h"
34abbd68 41
7d51a0db
MB		 42#define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
5da84fd9
JP		 44#define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50#define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
52
414c70cb
LG		 53static DEFINE_MUTEX(regulator_list_mutex);
54static LIST_HEAD(regulator_list);
55static LIST_HEAD(regulator_map_list);
f19b00da 56static LIST_HEAD(regulator_ena_gpio_list);
a06ccd9c 57static LIST_HEAD(regulator_supply_alias_list);
21cf891a 58static bool has_full_constraints;
414c70cb 59
1130e5b3 60static struct dentry *debugfs_root;
1130e5b3 61
8dc5390d 62/*
414c70cb
LG		 63 * struct regulator_map
64 *
65 * Used to provide symbolic supply names to devices.
66 */
67struct regulator_map {
68 struct list_head list;
40f9244f 69 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 70 const char *supply;
a5766f11 71 struct regulator_dev *regulator;
414c70cb
LG		 72};
73
f19b00da
KM		 74/*
75 * struct regulator_enable_gpio
76 *
77 * Management for shared enable GPIO pin
78 */
79struct regulator_enable_gpio {
80 struct list_head list;
778b28b4 81 struct gpio_desc *gpiod;
f19b00da
KM		 82 u32 enable_count; /* a number of enabled shared GPIO */
83 u32 request_count; /* a number of requested shared GPIO */
84 unsigned int ena_gpio_invert:1;
85};
86
a06ccd9c
CK		 87/*
88 * struct regulator_supply_alias
89 *
90 * Used to map lookups for a supply onto an alternative device.
91 */
92struct regulator_supply_alias {
93 struct list_head list;
94 struct device *src_dev;
95 const char *src_supply;
96 struct device *alias_dev;
97 const char *alias_supply;
98};
99
414c70cb 100static int _regulator_is_enabled(struct regulator_dev *rdev);
3801b86a 101static int _regulator_disable(struct regulator_dev *rdev);
414c70cb
LG		 102static int _regulator_get_voltage(struct regulator_dev *rdev);
103static int _regulator_get_current_limit(struct regulator_dev *rdev);
104static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
7179569a 105static int _notifier_call_chain(struct regulator_dev *rdev,
414c70cb 106 unsigned long event, void *data);
75790251
MB		 107static int _regulator_do_set_voltage(struct regulator_dev *rdev,
108 int min_uV, int max_uV);
3801b86a
MB		 109static struct regulator *create_regulator(struct regulator_dev *rdev,
110 struct device *dev,
111 const char *supply_name);
414c70cb 112
1083c393
MB		 113static const char *rdev_get_name(struct regulator_dev *rdev)
114{
115 if (rdev->constraints && rdev->constraints->name)
116 return rdev->constraints->name;
117 else if (rdev->desc->name)
118 return rdev->desc->name;
119 else
120 return "";
121}
122
87b28417
MB		 123static bool have_full_constraints(void)
124{
75bc9641 125 return has_full_constraints || of_have_populated_dt();
87b28417
MB		 126}
127
69511a45
RN		 128/**
129 * of_get_regulator - get a regulator device node based on supply name
130 * @dev: Device pointer for the consumer (of regulator) device
131 * @supply: regulator supply name
132 *
133 * Extract the regulator device node corresponding to the supply name.
167d41dc 134 * returns the device node corresponding to the regulator if found, else
69511a45
RN		 135 * returns NULL.
136 */
137static struct device_node *of_get_regulator(struct device *dev, const char *supply)
138{
139 struct device_node *regnode = NULL;
140 char prop_name[32]; /* 32 is max size of property name */
141
142 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
143
144 snprintf(prop_name, 32, "%s-supply", supply);
145 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
146
147 if (!regnode) {
16fbcc3b 148 dev_dbg(dev, "Looking up %s property in node %s failed",
69511a45
RN		 149 prop_name, dev->of_node->full_name);
150 return NULL;
151 }
152 return regnode;
153}
154
6492bc1b
MB		 155static int _regulator_can_change_status(struct regulator_dev *rdev)
156{
157 if (!rdev->constraints)
158 return 0;
159
160 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
161 return 1;
162 else
163 return 0;
164}
165
414c70cb
LG		 166/* Platform voltage constraint check */
167static int regulator_check_voltage(struct regulator_dev *rdev,
168 int *min_uV, int *max_uV)
169{
170 BUG_ON(*min_uV > *max_uV);
171
172 if (!rdev->constraints) {
5da84fd9 173 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 174 return -ENODEV;
175 }
176 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
5da84fd9 177 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 178 return -EPERM;
179 }
180
181 if (*max_uV > rdev->constraints->max_uV)
182 *max_uV = rdev->constraints->max_uV;
183 if (*min_uV < rdev->constraints->min_uV)
184 *min_uV = rdev->constraints->min_uV;
185
89f425ed
MB		 186 if (*min_uV > *max_uV) {
187 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 188 *min_uV, *max_uV);
414c70cb 189 return -EINVAL;
89f425ed 190 }
414c70cb
LG		 191
192 return 0;
193}
194
05fda3b1
TP		 195/* Make sure we select a voltage that suits the needs of all
196 * regulator consumers
197 */
198static int regulator_check_consumers(struct regulator_dev *rdev,
199 int *min_uV, int *max_uV)
200{
201 struct regulator *regulator;
202
203 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4aa922c0
MB		 204 /*
205 * Assume consumers that didn't say anything are OK
206 * with anything in the constraint range.
207 */
208 if (!regulator->min_uV && !regulator->max_uV)
209 continue;
210
05fda3b1
TP		 211 if (*max_uV > regulator->max_uV)
212 *max_uV = regulator->max_uV;
213 if (*min_uV < regulator->min_uV)
214 *min_uV = regulator->min_uV;
215 }
216
dd8004af 217 if (*min_uV > *max_uV) {
9c7b4e8a
RD		 218 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
219 *min_uV, *max_uV);
05fda3b1 220 return -EINVAL;
dd8004af 221 }
05fda3b1
TP		 222
223 return 0;
224}
225
414c70cb
LG		 226/* current constraint check */
227static int regulator_check_current_limit(struct regulator_dev *rdev,
228 int *min_uA, int *max_uA)
229{
230 BUG_ON(*min_uA > *max_uA);
231
232 if (!rdev->constraints) {
5da84fd9 233 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 234 return -ENODEV;
235 }
236 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
5da84fd9 237 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 238 return -EPERM;
239 }
240
241 if (*max_uA > rdev->constraints->max_uA)
242 *max_uA = rdev->constraints->max_uA;
243 if (*min_uA < rdev->constraints->min_uA)
244 *min_uA = rdev->constraints->min_uA;
245
89f425ed
MB		 246 if (*min_uA > *max_uA) {
247 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 248 *min_uA, *max_uA);
414c70cb 249 return -EINVAL;
89f425ed 250 }
414c70cb
LG		 251
252 return 0;
253}
254
255/* operating mode constraint check */
2c608234 256static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 257{
2c608234 258 switch (*mode) {
e573520b
DB		 259 case REGULATOR_MODE_FAST:
260 case REGULATOR_MODE_NORMAL:
261 case REGULATOR_MODE_IDLE:
262 case REGULATOR_MODE_STANDBY:
263 break;
264 default:
89f425ed 265 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 266 return -EINVAL;
267 }
268
414c70cb 269 if (!rdev->constraints) {
5da84fd9 270 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 271 return -ENODEV;
272 }
273 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
5da84fd9 274 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 275 return -EPERM;
276 }
2c608234
MB		 277
278 /* The modes are bitmasks, the most power hungry modes having
279 * the lowest values. If the requested mode isn't supported
280 * try higher modes. */
281 while (*mode) {
282 if (rdev->constraints->valid_modes_mask & *mode)
283 return 0;
284 *mode /= 2;
414c70cb 285 }
2c608234
MB		 286
287 return -EINVAL;
414c70cb
LG		 288}
289
290/* dynamic regulator mode switching constraint check */
291static int regulator_check_drms(struct regulator_dev *rdev)
292{
293 if (!rdev->constraints) {
5da84fd9 294 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 295 return -ENODEV;
296 }
297 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
5da84fd9 298 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 299 return -EPERM;
300 }
301 return 0;
302}
303
414c70cb
LG		 304static ssize_t regulator_uV_show(struct device *dev,
305 struct device_attribute *attr, char *buf)
306{
a5766f11 307 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 308 ssize_t ret;
309
310 mutex_lock(&rdev->mutex);
311 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
312 mutex_unlock(&rdev->mutex);
313
314 return ret;
315}
7ad68e2f 316static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 317
318static ssize_t regulator_uA_show(struct device *dev,
319 struct device_attribute *attr, char *buf)
320{
a5766f11 321 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 322
323 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
324}
7ad68e2f 325static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 326
587cea27
GKH		 327static ssize_t name_show(struct device *dev, struct device_attribute *attr,
328 char *buf)
bc558a60
MB		 329{
330 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 331
1083c393 332 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60 333}
587cea27 334static DEVICE_ATTR_RO(name);
bc558a60 335
4fca9545 336static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 337{
414c70cb
LG		 338 switch (mode) {
339 case REGULATOR_MODE_FAST:
340 return sprintf(buf, "fast\n");
341 case REGULATOR_MODE_NORMAL:
342 return sprintf(buf, "normal\n");
343 case REGULATOR_MODE_IDLE:
344 return sprintf(buf, "idle\n");
345 case REGULATOR_MODE_STANDBY:
346 return sprintf(buf, "standby\n");
347 }
348 return sprintf(buf, "unknown\n");
349}
350
4fca9545
DB		 351static ssize_t regulator_opmode_show(struct device *dev,
352 struct device_attribute *attr, char *buf)
414c70cb 353{
a5766f11 354 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 355
4fca9545
DB		 356 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
357}
7ad68e2f 358static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 359
360static ssize_t regulator_print_state(char *buf, int state)
361{
414c70cb
LG		 362 if (state > 0)
363 return sprintf(buf, "enabled\n");
364 else if (state == 0)
365 return sprintf(buf, "disabled\n");
366 else
367 return sprintf(buf, "unknown\n");
368}
369
4fca9545
DB		 370static ssize_t regulator_state_show(struct device *dev,
371 struct device_attribute *attr, char *buf)
372{
373 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 374 ssize_t ret;
375
376 mutex_lock(&rdev->mutex);
377 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
378 mutex_unlock(&rdev->mutex);
4fca9545 379
9332546f 380 return ret;
4fca9545 381}
7ad68e2f 382static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 383
853116a1
DB		 384static ssize_t regulator_status_show(struct device *dev,
385 struct device_attribute *attr, char *buf)
386{
387 struct regulator_dev *rdev = dev_get_drvdata(dev);
388 int status;
389 char *label;
390
391 status = rdev->desc->ops->get_status(rdev);
392 if (status < 0)
393 return status;
394
395 switch (status) {
396 case REGULATOR_STATUS_OFF:
397 label = "off";
398 break;
399 case REGULATOR_STATUS_ON:
400 label = "on";
401 break;
402 case REGULATOR_STATUS_ERROR:
403 label = "error";
404 break;
405 case REGULATOR_STATUS_FAST:
406 label = "fast";
407 break;
408 case REGULATOR_STATUS_NORMAL:
409 label = "normal";
410 break;
411 case REGULATOR_STATUS_IDLE:
412 label = "idle";
413 break;
414 case REGULATOR_STATUS_STANDBY:
415 label = "standby";
416 break;
f59c8f9f
MB		 417 case REGULATOR_STATUS_BYPASS:
418 label = "bypass";
419 break;
1beaf762
KG		 420 case REGULATOR_STATUS_UNDEFINED:
421 label = "undefined";
422 break;
853116a1
DB		 423 default:
424 return -ERANGE;
425 }
426
427 return sprintf(buf, "%s\n", label);
428}
429static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
430
414c70cb
LG		 431static ssize_t regulator_min_uA_show(struct device *dev,
432 struct device_attribute *attr, char *buf)
433{
a5766f11 434 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 435
436 if (!rdev->constraints)
437 return sprintf(buf, "constraint not defined\n");
438
439 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
440}
7ad68e2f 441static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 442
443static ssize_t regulator_max_uA_show(struct device *dev,
444 struct device_attribute *attr, char *buf)
445{
a5766f11 446 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 447
448 if (!rdev->constraints)
449 return sprintf(buf, "constraint not defined\n");
450
451 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
452}
7ad68e2f 453static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 454
455static ssize_t regulator_min_uV_show(struct device *dev,
456 struct device_attribute *attr, char *buf)
457{
a5766f11 458 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 459
460 if (!rdev->constraints)
461 return sprintf(buf, "constraint not defined\n");
462
463 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
464}
7ad68e2f 465static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 466
467static ssize_t regulator_max_uV_show(struct device *dev,
468 struct device_attribute *attr, char *buf)
469{
a5766f11 470 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 471
472 if (!rdev->constraints)
473 return sprintf(buf, "constraint not defined\n");
474
475 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
476}
7ad68e2f 477static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 478
479static ssize_t regulator_total_uA_show(struct device *dev,
480 struct device_attribute *attr, char *buf)
481{
a5766f11 482 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 483 struct regulator *regulator;
484 int uA = 0;
485
486 mutex_lock(&rdev->mutex);
487 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 488 uA += regulator->uA_load;
414c70cb
LG		 489 mutex_unlock(&rdev->mutex);
490 return sprintf(buf, "%d\n", uA);
491}
7ad68e2f 492static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb 493
587cea27
GKH		 494static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
495 char *buf)
414c70cb 496{
a5766f11 497 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 498 return sprintf(buf, "%d\n", rdev->use_count);
499}
587cea27 500static DEVICE_ATTR_RO(num_users);
414c70cb 501
587cea27
GKH		 502static ssize_t type_show(struct device *dev, struct device_attribute *attr,
503 char *buf)
414c70cb 504{
a5766f11 505 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 506
507 switch (rdev->desc->type) {
508 case REGULATOR_VOLTAGE:
509 return sprintf(buf, "voltage\n");
510 case REGULATOR_CURRENT:
511 return sprintf(buf, "current\n");
512 }
513 return sprintf(buf, "unknown\n");
514}
587cea27 515static DEVICE_ATTR_RO(type);
414c70cb
LG		 516
517static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
518 struct device_attribute *attr, char *buf)
519{
a5766f11 520 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 521
414c70cb
LG		 522 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
523}
7ad68e2f
DB		 524static DEVICE_ATTR(suspend_mem_microvolts, 0444,
525 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 526
527static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
528 struct device_attribute *attr, char *buf)
529{
a5766f11 530 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 531
414c70cb
LG		 532 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
533}
7ad68e2f
DB		 534static DEVICE_ATTR(suspend_disk_microvolts, 0444,
535 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 536
537static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
538 struct device_attribute *attr, char *buf)
539{
a5766f11 540 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 541
414c70cb
LG		 542 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
543}
7ad68e2f
DB		 544static DEVICE_ATTR(suspend_standby_microvolts, 0444,
545 regulator_suspend_standby_uV_show, NULL);
414c70cb 546
414c70cb
LG		 547static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
548 struct device_attribute *attr, char *buf)
549{
a5766f11 550 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 551
4fca9545
DB		 552 return regulator_print_opmode(buf,
553 rdev->constraints->state_mem.mode);
414c70cb 554}
7ad68e2f
DB		 555static DEVICE_ATTR(suspend_mem_mode, 0444,
556 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 557
558static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
559 struct device_attribute *attr, char *buf)
560{
a5766f11 561 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 562
4fca9545
DB		 563 return regulator_print_opmode(buf,
564 rdev->constraints->state_disk.mode);
414c70cb 565}
7ad68e2f
DB		 566static DEVICE_ATTR(suspend_disk_mode, 0444,
567 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 568
569static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
570 struct device_attribute *attr, char *buf)
571{
a5766f11 572 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 573
4fca9545
DB		 574 return regulator_print_opmode(buf,
575 rdev->constraints->state_standby.mode);
414c70cb 576}
7ad68e2f
DB		 577static DEVICE_ATTR(suspend_standby_mode, 0444,
578 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 579
580static ssize_t regulator_suspend_mem_state_show(struct device *dev,
581 struct device_attribute *attr, char *buf)
582{
a5766f11 583 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 584
4fca9545
DB		 585 return regulator_print_state(buf,
586 rdev->constraints->state_mem.enabled);
414c70cb 587}
7ad68e2f
DB		 588static DEVICE_ATTR(suspend_mem_state, 0444,
589 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 590
591static ssize_t regulator_suspend_disk_state_show(struct device *dev,
592 struct device_attribute *attr, char *buf)
593{
a5766f11 594 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 595
4fca9545
DB		 596 return regulator_print_state(buf,
597 rdev->constraints->state_disk.enabled);
414c70cb 598}
7ad68e2f
DB		 599static DEVICE_ATTR(suspend_disk_state, 0444,
600 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 601
602static ssize_t regulator_suspend_standby_state_show(struct device *dev,
603 struct device_attribute *attr, char *buf)
604{
a5766f11 605 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 606
4fca9545
DB		 607 return regulator_print_state(buf,
608 rdev->constraints->state_standby.enabled);
414c70cb 609}
7ad68e2f
DB		 610static DEVICE_ATTR(suspend_standby_state, 0444,
611 regulator_suspend_standby_state_show, NULL);
612
f59c8f9f
MB		 613static ssize_t regulator_bypass_show(struct device *dev,
614 struct device_attribute *attr, char *buf)
615{
616 struct regulator_dev *rdev = dev_get_drvdata(dev);
617 const char *report;
618 bool bypass;
619 int ret;
620
621 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
622
623 if (ret != 0)
624 report = "unknown";
625 else if (bypass)
626 report = "enabled";
627 else
628 report = "disabled";
629
630 return sprintf(buf, "%s\n", report);
631}
632static DEVICE_ATTR(bypass, 0444,
633 regulator_bypass_show, NULL);
bc558a60 634
414c70cb
LG		 635/* Calculate the new optimum regulator operating mode based on the new total
636 * consumer load. All locks held by caller */
8460ef38 637static int drms_uA_update(struct regulator_dev *rdev)
414c70cb
LG		 638{
639 struct regulator *sibling;
640 int current_uA = 0, output_uV, input_uV, err;
641 unsigned int mode;
642
8460ef38
BA		 643 /*
644 * first check to see if we can set modes at all, otherwise just
645 * tell the consumer everything is OK.
646 */
414c70cb 647 err = regulator_check_drms(rdev);
8460ef38
BA		 648 if (err < 0)
649 return 0;
650
8f4490e0
BA		 651 if (!rdev->desc->ops->get_optimum_mode &&
652 !rdev->desc->ops->set_load)
8460ef38
BA		 653 return 0;
654
8f4490e0
BA		 655 if (!rdev->desc->ops->set_mode &&
656 !rdev->desc->ops->set_load)
8460ef38 657 return -EINVAL;
414c70cb
LG		 658
659 /* get output voltage */
1bf5a1f8 660 output_uV = _regulator_get_voltage(rdev);
8460ef38
BA		 661 if (output_uV <= 0) {
662 rdev_err(rdev, "invalid output voltage found\n");
663 return -EINVAL;
664 }
414c70cb
LG		 665
666 /* get input voltage */
1bf5a1f8
MB		 667 input_uV = 0;
668 if (rdev->supply)
3f24f5ad 669 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 670 if (input_uV <= 0)
414c70cb 671 input_uV = rdev->constraints->input_uV;
8460ef38
BA		 672 if (input_uV <= 0) {
673 rdev_err(rdev, "invalid input voltage found\n");
674 return -EINVAL;
675 }
414c70cb
LG		 676
677 /* calc total requested load */
678 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 679 current_uA += sibling->uA_load;
414c70cb 680
22a10bca
SB		 681 current_uA += rdev->constraints->system_load;
682
8f4490e0
BA		 683 if (rdev->desc->ops->set_load) {
684 /* set the optimum mode for our new total regulator load */
685 err = rdev->desc->ops->set_load(rdev, current_uA);
686 if (err < 0)
687 rdev_err(rdev, "failed to set load %d\n", current_uA);
688 } else {
689 /* now get the optimum mode for our new total regulator load */
690 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
691 output_uV, current_uA);
692
693 /* check the new mode is allowed */
694 err = regulator_mode_constrain(rdev, &mode);
695 if (err < 0) {
696 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
697 current_uA, input_uV, output_uV);
698 return err;
699 }
414c70cb 700
8f4490e0
BA		 701 err = rdev->desc->ops->set_mode(rdev, mode);
702 if (err < 0)
703 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
8460ef38
BA		 704 }
705
8460ef38 706 return err;
414c70cb
LG		 707}
708
709static int suspend_set_state(struct regulator_dev *rdev,
710 struct regulator_state *rstate)
711{
712 int ret = 0;
638f85c5
MB		 713
714 /* If we have no suspend mode configration don't set anything;
8ac0e95d
AL		 715 * only warn if the driver implements set_suspend_voltage or
716 * set_suspend_mode callback.
638f85c5
MB		 717 */
718 if (!rstate->enabled && !rstate->disabled) {
8ac0e95d
AL		 719 if (rdev->desc->ops->set_suspend_voltage ||
720 rdev->desc->ops->set_suspend_mode)
5da84fd9 721 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 722 return 0;
723 }
724
725 if (rstate->enabled && rstate->disabled) {
5da84fd9 726 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 727 return -EINVAL;
728 }
414c70cb 729
8ac0e95d 730 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
414c70cb 731 ret = rdev->desc->ops->set_suspend_enable(rdev);
8ac0e95d 732 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
414c70cb 733 ret = rdev->desc->ops->set_suspend_disable(rdev);
8ac0e95d
AL		 734 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
735 ret = 0;
736
414c70cb 737 if (ret < 0) {
5da84fd9 738 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 739 return ret;
740 }
741
742 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
743 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
744 if (ret < 0) {
5da84fd9 745 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 746 return ret;
747 }
748 }
749
750 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
751 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
752 if (ret < 0) {
5da84fd9 753 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 754 return ret;
755 }
756 }
757 return ret;
758}
759
760/* locks held by caller */
761static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
762{
763 if (!rdev->constraints)
764 return -EINVAL;
765
766 switch (state) {
767 case PM_SUSPEND_STANDBY:
768 return suspend_set_state(rdev,
769 &rdev->constraints->state_standby);
770 case PM_SUSPEND_MEM:
771 return suspend_set_state(rdev,
772 &rdev->constraints->state_mem);
773 case PM_SUSPEND_MAX:
774 return suspend_set_state(rdev,
775 &rdev->constraints->state_disk);
776 default:
777 return -EINVAL;
778 }
779}
780
781static void print_constraints(struct regulator_dev *rdev)
782{
783 struct regulation_constraints *constraints = rdev->constraints;
973e9a27 784 char buf[80] = "";
8f031b48
MB		 785 int count = 0;
786 int ret;
414c70cb 787
8f031b48 788 if (constraints->min_uV && constraints->max_uV) {
414c70cb 789 if (constraints->min_uV == constraints->max_uV)
8f031b48
MB		 790 count += sprintf(buf + count, "%d mV ",
791 constraints->min_uV / 1000);
414c70cb 792 else
8f031b48
MB		 793 count += sprintf(buf + count, "%d <--> %d mV ",
794 constraints->min_uV / 1000,
795 constraints->max_uV / 1000);
796 }
797
798 if (!constraints->min_uV ||
799 constraints->min_uV != constraints->max_uV) {
800 ret = _regulator_get_voltage(rdev);
801 if (ret > 0)
802 count += sprintf(buf + count, "at %d mV ", ret / 1000);
803 }
804
bf5892a8
MB		 805 if (constraints->uV_offset)
806 count += sprintf(buf, "%dmV offset ",
807 constraints->uV_offset / 1000);
808
8f031b48 809 if (constraints->min_uA && constraints->max_uA) {
414c70cb 810 if (constraints->min_uA == constraints->max_uA)
8f031b48
MB		 811 count += sprintf(buf + count, "%d mA ",
812 constraints->min_uA / 1000);
414c70cb 813 else
8f031b48
MB		 814 count += sprintf(buf + count, "%d <--> %d mA ",
815 constraints->min_uA / 1000,
816 constraints->max_uA / 1000);
817 }
818
819 if (!constraints->min_uA ||
820 constraints->min_uA != constraints->max_uA) {
821 ret = _regulator_get_current_limit(rdev);
822 if (ret > 0)
e4a6376b 823 count += sprintf(buf + count, "at %d mA ", ret / 1000);
414c70cb 824 }
8f031b48 825
414c70cb
LG		 826 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
827 count += sprintf(buf + count, "fast ");
828 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
829 count += sprintf(buf + count, "normal ");
830 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
831 count += sprintf(buf + count, "idle ");
832 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
833 count += sprintf(buf + count, "standby");
834
215b8b05
UKK		 835 if (!count)
836 sprintf(buf, "no parameters");
837
194dbaef 838 rdev_dbg(rdev, "%s\n", buf);
4a682922
MB		 839
840 if ((constraints->min_uV != constraints->max_uV) &&
841 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
842 rdev_warn(rdev,
843 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 844}
845
e79055d6 846static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 847 struct regulation_constraints *constraints)
a5766f11 848{
272e2315 849 const struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 850 int ret;
851
852 /* do we need to apply the constraint voltage */
853 if (rdev->constraints->apply_uV &&
75790251 854 rdev->constraints->min_uV == rdev->constraints->max_uV) {
064d5cd1
AB		 855 int current_uV = _regulator_get_voltage(rdev);
856 if (current_uV < 0) {
69d58839
NM		 857 rdev_err(rdev,
858 "failed to get the current voltage(%d)\n",
859 current_uV);
064d5cd1
AB		 860 return current_uV;
861 }
862 if (current_uV < rdev->constraints->min_uV ||
863 current_uV > rdev->constraints->max_uV) {
864 ret = _regulator_do_set_voltage(
865 rdev, rdev->constraints->min_uV,
866 rdev->constraints->max_uV);
867 if (ret < 0) {
868 rdev_err(rdev,
69d58839
NM		 869 "failed to apply %duV constraint(%d)\n",
870 rdev->constraints->min_uV, ret);
064d5cd1
AB		 871 return ret;
872 }
75790251 873 }
af5866c9 874 }
e06f5b4f 875
4367cfdc
DB		 876 /* constrain machine-level voltage specs to fit
877 * the actual range supported by this regulator.
878 */
879 if (ops->list_voltage && rdev->desc->n_voltages) {
880 int count = rdev->desc->n_voltages;
881 int i;
882 int min_uV = INT_MAX;
883 int max_uV = INT_MIN;
884 int cmin = constraints->min_uV;
885 int cmax = constraints->max_uV;
886
3e590918
MB		 887 /* it's safe to autoconfigure fixed-voltage supplies
888 and the constraints are used by list_voltage. */
4367cfdc 889 if (count == 1 && !cmin) {
3e590918 890 cmin = 1;
4367cfdc 891 cmax = INT_MAX;
3e590918
MB		 892 constraints->min_uV = cmin;
893 constraints->max_uV = cmax;
4367cfdc
DB		 894 }
895
3e2b9abd
MB		 896 /* voltage constraints are optional */
897 if ((cmin == 0) && (cmax == 0))
e79055d6 898 return 0;
3e2b9abd 899
4367cfdc 900 /* else require explicit machine-level constraints */
3e2b9abd 901 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 902 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 903 return -EINVAL;
4367cfdc
DB		 904 }
905
906 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
907 for (i = 0; i < count; i++) {
908 int value;
909
910 value = ops->list_voltage(rdev, i);
911 if (value <= 0)
912 continue;
913
914 /* maybe adjust [min_uV..max_uV] */
915 if (value >= cmin && value < min_uV)
916 min_uV = value;
917 if (value <= cmax && value > max_uV)
918 max_uV = value;
919 }
920
921 /* final: [min_uV..max_uV] valid iff constraints valid */
922 if (max_uV < min_uV) {
fff15bef
MB		 923 rdev_err(rdev,
924 "unsupportable voltage constraints %u-%uuV\n",
925 min_uV, max_uV);
e79055d6 926 return -EINVAL;
4367cfdc
DB		 927 }
928
929 /* use regulator's subset of machine constraints */
930 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 931 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
932 constraints->min_uV, min_uV);
4367cfdc
DB		 933 constraints->min_uV = min_uV;
934 }
935 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 936 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
937 constraints->max_uV, max_uV);
4367cfdc
DB		 938 constraints->max_uV = max_uV;
939 }
940 }
941
e79055d6
MB		 942 return 0;
943}
944
f8c1700d
LD		 945static int machine_constraints_current(struct regulator_dev *rdev,
946 struct regulation_constraints *constraints)
947{
272e2315 948 const struct regulator_ops *ops = rdev->desc->ops;
f8c1700d
LD		 949 int ret;
950
951 if (!constraints->min_uA && !constraints->max_uA)
952 return 0;
953
954 if (constraints->min_uA > constraints->max_uA) {
955 rdev_err(rdev, "Invalid current constraints\n");
956 return -EINVAL;
957 }
958
959 if (!ops->set_current_limit || !ops->get_current_limit) {
960 rdev_warn(rdev, "Operation of current configuration missing\n");
961 return 0;
962 }
963
964 /* Set regulator current in constraints range */
965 ret = ops->set_current_limit(rdev, constraints->min_uA,
966 constraints->max_uA);
967 if (ret < 0) {
968 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
969 return ret;
970 }
971
972 return 0;
973}
974
30c21971
MP		 975static int _regulator_do_enable(struct regulator_dev *rdev);
976
e79055d6
MB		 977/**
978 * set_machine_constraints - sets regulator constraints
979 * @rdev: regulator source
980 * @constraints: constraints to apply
981 *
982 * Allows platform initialisation code to define and constrain
983 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
984 * Constraints *must* be set by platform code in order for some
985 * regulator operations to proceed i.e. set_voltage, set_current_limit,
986 * set_mode.
987 */
988static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 989 const struct regulation_constraints *constraints)
e79055d6
MB		 990{
991 int ret = 0;
272e2315 992 const struct regulator_ops *ops = rdev->desc->ops;
e79055d6 993
9a8f5e07
MB		 994 if (constraints)
995 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
996 GFP_KERNEL);
997 else
998 rdev->constraints = kzalloc(sizeof(*constraints),
999 GFP_KERNEL);
f8c12fe3
MB		 1000 if (!rdev->constraints)
1001 return -ENOMEM;
af5866c9 1002
f8c12fe3 1003 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6
MB		 1004 if (ret != 0)
1005 goto out;
1006
f8c1700d 1007 ret = machine_constraints_current(rdev, rdev->constraints);
e79055d6
MB		 1008 if (ret != 0)
1009 goto out;
1010
a5766f11 1011 /* do we need to setup our suspend state */
9a8f5e07 1012 if (rdev->constraints->initial_state) {
f8c12fe3 1013 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 1014 if (ret < 0) {
5da84fd9 1015 rdev_err(rdev, "failed to set suspend state\n");
e06f5b4f
MB		 1016 goto out;
1017 }
1018 }
a5766f11 1019
9a8f5e07 1020 if (rdev->constraints->initial_mode) {
a308466c 1021 if (!ops->set_mode) {
5da84fd9 1022 rdev_err(rdev, "no set_mode operation\n");
a308466c
MB		 1023 ret = -EINVAL;
1024 goto out;
1025 }
1026
f8c12fe3 1027 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 1028 if (ret < 0) {
5da84fd9 1029 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
a308466c
MB		 1030 goto out;
1031 }
1032 }
1033
cacf90f2
MB		 1034 /* If the constraints say the regulator should be on at this point
1035 * and we have control then make sure it is enabled.
1036 */
30c21971
MP		 1037 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1038 ret = _regulator_do_enable(rdev);
1039 if (ret < 0 && ret != -EINVAL) {
5da84fd9 1040 rdev_err(rdev, "failed to enable\n");
e5fda26c
MB		 1041 goto out;
1042 }
1043 }
1044
1653ccf4
YSB		 1045 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1046 && ops->set_ramp_delay) {
6f0b2c69
YSB		 1047 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1048 if (ret < 0) {
1049 rdev_err(rdev, "failed to set ramp_delay\n");
1050 goto out;
1051 }
1052 }
1053
a5766f11 1054 print_constraints(rdev);
1a6958e7 1055 return 0;
a5766f11 1056out:
1a6958e7
AL		 1057 kfree(rdev->constraints);
1058 rdev->constraints = NULL;
a5766f11
LG		 1059 return ret;
1060}
1061
1062/**
1063 * set_supply - set regulator supply regulator
69279fb9
MB		 1064 * @rdev: regulator name
1065 * @supply_rdev: supply regulator name
a5766f11
LG		 1066 *
1067 * Called by platform initialisation code to set the supply regulator for this
1068 * regulator. This ensures that a regulators supply will also be enabled by the
1069 * core if it's child is enabled.
1070 */
1071static int set_supply(struct regulator_dev *rdev,
3801b86a 1072 struct regulator_dev *supply_rdev)
a5766f11
LG		 1073{
1074 int err;
1075
3801b86a
MB		 1076 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1077
1078 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 1079 if (rdev->supply == NULL) {
1080 err = -ENOMEM;
3801b86a 1081 return err;
a5766f11 1082 }
57ad526a 1083 supply_rdev->open_count++;
3801b86a
MB		 1084
1085 return 0;
a5766f11
LG		 1086}
1087
1088/**
06c63f93 1089 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 1090 * @rdev: regulator source
40f9244f 1091 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 1092 * @supply: symbolic name for supply
a5766f11
LG		 1093 *
1094 * Allows platform initialisation code to map physical regulator
1095 * sources to symbolic names for supplies for use by devices. Devices
1096 * should use these symbolic names to request regulators, avoiding the
1097 * need to provide board-specific regulator names as platform data.
1098 */
1099static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 1100 const char *consumer_dev_name,
1101 const char *supply)
a5766f11
LG		 1102{
1103 struct regulator_map *node;
9ed2099e 1104 int has_dev;
a5766f11
LG		 1105
1106 if (supply == NULL)
1107 return -EINVAL;
1108
9ed2099e
MB		 1109 if (consumer_dev_name != NULL)
1110 has_dev = 1;
1111 else
1112 has_dev = 0;
1113
6001e13c 1114 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1115 if (node->dev_name && consumer_dev_name) {
1116 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1117 continue;
1118 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1119 continue;
23b5cc2a
JN		 1120 }
1121
6001e13c
DB		 1122 if (strcmp(node->supply, supply) != 0)
1123 continue;
1124
737f360d
MB		 1125 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1126 consumer_dev_name,
1127 dev_name(&node->regulator->dev),
1128 node->regulator->desc->name,
1129 supply,
1130 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 1131 return -EBUSY;
1132 }
1133
9ed2099e 1134 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 1135 if (node == NULL)
1136 return -ENOMEM;
1137
1138 node->regulator = rdev;
a5766f11
LG		 1139 node->supply = supply;
1140
9ed2099e
MB		 1141 if (has_dev) {
1142 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1143 if (node->dev_name == NULL) {
1144 kfree(node);
1145 return -ENOMEM;
1146 }
40f9244f
MB		 1147 }
1148
a5766f11
LG		 1149 list_add(&node->list, &regulator_map_list);
1150 return 0;
1151}
1152
0f1d747b
MR		 1153static void unset_regulator_supplies(struct regulator_dev *rdev)
1154{
1155 struct regulator_map *node, *n;
1156
1157 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1158 if (rdev == node->regulator) {
1159 list_del(&node->list);
40f9244f 1160 kfree(node->dev_name);
0f1d747b 1161 kfree(node);
0f1d747b
MR		 1162 }
1163 }
1164}
1165
f5726ae3 1166#define REG_STR_SIZE 64
414c70cb
LG		 1167
1168static struct regulator *create_regulator(struct regulator_dev *rdev,
1169 struct device *dev,
1170 const char *supply_name)
1171{
1172 struct regulator *regulator;
1173 char buf[REG_STR_SIZE];
1174 int err, size;
1175
1176 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1177 if (regulator == NULL)
1178 return NULL;
1179
1180 mutex_lock(&rdev->mutex);
1181 regulator->rdev = rdev;
1182 list_add(&regulator->list, &rdev->consumer_list);
1183
1184 if (dev) {
e2c98eaf
SG		 1185 regulator->dev = dev;
1186
222cc7b1 1187 /* Add a link to the device sysfs entry */
414c70cb
LG		 1188 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1189 dev->kobj.name, supply_name);
1190 if (size >= REG_STR_SIZE)
222cc7b1 1191 goto overflow_err;
414c70cb
LG		 1192
1193 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1194 if (regulator->supply_name == NULL)
222cc7b1 1195 goto overflow_err;
414c70cb
LG		 1196
1197 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1198 buf);
1199 if (err) {
5da84fd9
JP		 1200 rdev_warn(rdev, "could not add device link %s err %d\n",
1201 dev->kobj.name, err);
222cc7b1 1202 /* non-fatal */
414c70cb 1203 }
5de70519
MB		 1204 } else {
1205 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1206 if (regulator->supply_name == NULL)
222cc7b1 1207 goto overflow_err;
5de70519
MB		 1208 }
1209
5de70519
MB		 1210 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1211 rdev->debugfs);
24751434 1212 if (!regulator->debugfs) {
5de70519 1213 rdev_warn(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1214 } else {
1215 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1216 &regulator->uA_load);
1217 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1218 &regulator->min_uV);
1219 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1220 &regulator->max_uV);
414c70cb 1221 }
5de70519 1222
6492bc1b
MB		 1223 /*
1224 * Check now if the regulator is an always on regulator - if
1225 * it is then we don't need to do nearly so much work for
1226 * enable/disable calls.
1227 */
1228 if (!_regulator_can_change_status(rdev) &&
1229 _regulator_is_enabled(rdev))
1230 regulator->always_on = true;
1231
414c70cb
LG		 1232 mutex_unlock(&rdev->mutex);
1233 return regulator;
414c70cb
LG		 1234overflow_err:
1235 list_del(&regulator->list);
1236 kfree(regulator);
1237 mutex_unlock(&rdev->mutex);
1238 return NULL;
1239}
1240
31aae2be
MB		 1241static int _regulator_get_enable_time(struct regulator_dev *rdev)
1242{
00c877c6
LD		 1243 if (rdev->constraints && rdev->constraints->enable_time)
1244 return rdev->constraints->enable_time;
31aae2be 1245 if (!rdev->desc->ops->enable_time)
79511ed3 1246 return rdev->desc->enable_time;
31aae2be
MB		 1247 return rdev->desc->ops->enable_time(rdev);
1248}
1249
a06ccd9c
CK		 1250static struct regulator_supply_alias *regulator_find_supply_alias(
1251 struct device *dev, const char *supply)
1252{
1253 struct regulator_supply_alias *map;
1254
1255 list_for_each_entry(map, &regulator_supply_alias_list, list)
1256 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1257 return map;
1258
1259 return NULL;
1260}
1261
1262static void regulator_supply_alias(struct device **dev, const char **supply)
1263{
1264 struct regulator_supply_alias *map;
1265
1266 map = regulator_find_supply_alias(*dev, *supply);
1267 if (map) {
1268 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1269 *supply, map->alias_supply,
1270 dev_name(map->alias_dev));
1271 *dev = map->alias_dev;
1272 *supply = map->alias_supply;
1273 }
1274}
1275
69511a45 1276static struct regulator_dev *regulator_dev_lookup(struct device *dev,
6d191a5f
MB		 1277 const char *supply,
1278 int *ret)
69511a45
RN		 1279{
1280 struct regulator_dev *r;
1281 struct device_node *node;
576ca436
MB		 1282 struct regulator_map *map;
1283 const char *devname = NULL;
69511a45 1284
a06ccd9c
CK		 1285 regulator_supply_alias(&dev, &supply);
1286
69511a45
RN		 1287 /* first do a dt based lookup */
1288 if (dev && dev->of_node) {
1289 node = of_get_regulator(dev, supply);
6d191a5f 1290 if (node) {
69511a45
RN		 1291 list_for_each_entry(r, &regulator_list, list)
1292 if (r->dev.parent &&
1293 node == r->dev.of_node)
1294 return r;
317b5684
MB		 1295 *ret = -EPROBE_DEFER;
1296 return NULL;
6d191a5f
MB		 1297 } else {
1298 /*
1299 * If we couldn't even get the node then it's
1300 * not just that the device didn't register
1301 * yet, there's no node and we'll never
1302 * succeed.
1303 */
1304 *ret = -ENODEV;
1305 }
69511a45
RN		 1306 }
1307
1308 /* if not found, try doing it non-dt way */
576ca436
MB		 1309 if (dev)
1310 devname = dev_name(dev);
1311
69511a45
RN		 1312 list_for_each_entry(r, &regulator_list, list)
1313 if (strcmp(rdev_get_name(r), supply) == 0)
1314 return r;
1315
576ca436
MB		 1316 list_for_each_entry(map, &regulator_map_list, list) {
1317 /* If the mapping has a device set up it must match */
1318 if (map->dev_name &&
1319 (!devname || strcmp(map->dev_name, devname)))
1320 continue;
1321
1322 if (strcmp(map->supply, supply) == 0)
1323 return map->regulator;
1324 }
1325
1326
69511a45
RN		 1327 return NULL;
1328}
1329
6261b06d
BA		 1330static int regulator_resolve_supply(struct regulator_dev *rdev)
1331{
1332 struct regulator_dev *r;
1333 struct device *dev = rdev->dev.parent;
1334 int ret;
1335
1336 /* No supply to resovle? */
1337 if (!rdev->supply_name)
1338 return 0;
1339
1340 /* Supply already resolved? */
1341 if (rdev->supply)
1342 return 0;
1343
1344 r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
1345 if (ret == -ENODEV) {
1346 /*
1347 * No supply was specified for this regulator and
1348 * there will never be one.
1349 */
1350 return 0;
1351 }
1352
1353 if (!r) {
1354 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1355 rdev->supply_name, rdev->desc->name);
1356 return -EPROBE_DEFER;
1357 }
1358
1359 /* Recursively resolve the supply of the supply */
1360 ret = regulator_resolve_supply(r);
1361 if (ret < 0)
1362 return ret;
1363
1364 ret = set_supply(rdev, r);
1365 if (ret < 0)
1366 return ret;
1367
1368 /* Cascade always-on state to supply */
1369 if (_regulator_is_enabled(rdev)) {
1370 ret = regulator_enable(rdev->supply);
1371 if (ret < 0)
1372 return ret;
1373 }
1374
1375 return 0;
1376}
1377
5ffbd136
MB		 1378/* Internal regulator request function */
1379static struct regulator *_regulator_get(struct device *dev, const char *id,
4ddfebd3 1380 bool exclusive, bool allow_dummy)
414c70cb
LG		 1381{
1382 struct regulator_dev *rdev;
04bf3011 1383 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
40f9244f 1384 const char *devname = NULL;
317b5684 1385 int ret;
414c70cb
LG		 1386
1387 if (id == NULL) {
5da84fd9 1388 pr_err("get() with no identifier\n");
043c998f 1389 return ERR_PTR(-EINVAL);
414c70cb
LG		 1390 }
1391
40f9244f
MB		 1392 if (dev)
1393 devname = dev_name(dev);
1394
317b5684
MB		 1395 if (have_full_constraints())
1396 ret = -ENODEV;
1397 else
1398 ret = -EPROBE_DEFER;
1399
414c70cb
LG		 1400 mutex_lock(&regulator_list_mutex);
1401
6d191a5f 1402 rdev = regulator_dev_lookup(dev, id, &ret);
69511a45
RN		 1403 if (rdev)
1404 goto found;
1405
ef60abbb
MB		 1406 regulator = ERR_PTR(ret);
1407
1e4b545c
NM		 1408 /*
1409 * If we have return value from dev_lookup fail, we do not expect to
1410 * succeed, so, quit with appropriate error value
1411 */
0d25d09d 1412 if (ret && ret != -ENODEV)
1e4b545c 1413 goto out;
1e4b545c 1414
34abbd68
MB		 1415 if (!devname)
1416 devname = "deviceless";
1417
4ddfebd3
MB		 1418 /*
1419 * Assume that a regulator is physically present and enabled
1420 * even if it isn't hooked up and just provide a dummy.
34abbd68 1421 */
87b28417 1422 if (have_full_constraints() && allow_dummy) {
5da84fd9
JP		 1423 pr_warn("%s supply %s not found, using dummy regulator\n",
1424 devname, id);
4ddfebd3 1425
34abbd68
MB		 1426 rdev = dummy_regulator_rdev;
1427 goto found;
0781719b
HG		 1428 /* Don't log an error when called from regulator_get_optional() */
1429 } else if (!have_full_constraints() || exclusive) {
acc3d5ce 1430 dev_warn(dev, "dummy supplies not allowed\n");
34abbd68 1431 }
34abbd68 1432
414c70cb
LG		 1433 mutex_unlock(&regulator_list_mutex);
1434 return regulator;
1435
1436found:
5ffbd136
MB		 1437 if (rdev->exclusive) {
1438 regulator = ERR_PTR(-EPERM);
1439 goto out;
1440 }
1441
1442 if (exclusive && rdev->open_count) {
1443 regulator = ERR_PTR(-EBUSY);
1444 goto out;
1445 }
1446
6261b06d
BA		 1447 ret = regulator_resolve_supply(rdev);
1448 if (ret < 0) {
1449 regulator = ERR_PTR(ret);
1450 goto out;
1451 }
1452
a5766f11
LG		 1453 if (!try_module_get(rdev->owner))
1454 goto out;
1455
414c70cb
LG		 1456 regulator = create_regulator(rdev, dev, id);
1457 if (regulator == NULL) {
1458 regulator = ERR_PTR(-ENOMEM);
1459 module_put(rdev->owner);
bcda4321 1460 goto out;
414c70cb
LG		 1461 }
1462
5ffbd136
MB		 1463 rdev->open_count++;
1464 if (exclusive) {
1465 rdev->exclusive = 1;
1466
1467 ret = _regulator_is_enabled(rdev);
1468 if (ret > 0)
1469 rdev->use_count = 1;
1470 else
1471 rdev->use_count = 0;
1472 }
1473
a5766f11 1474out:
414c70cb 1475 mutex_unlock(&regulator_list_mutex);
5ffbd136 1476
414c70cb
LG		 1477 return regulator;
1478}
5ffbd136
MB		 1479
1480/**
1481 * regulator_get - lookup and obtain a reference to a regulator.
1482 * @dev: device for regulator "consumer"
1483 * @id: Supply name or regulator ID.
1484 *
1485 * Returns a struct regulator corresponding to the regulator producer,
1486 * or IS_ERR() condition containing errno.
1487 *
1488 * Use of supply names configured via regulator_set_device_supply() is
1489 * strongly encouraged. It is recommended that the supply name used
1490 * should match the name used for the supply and/or the relevant
1491 * device pins in the datasheet.
1492 */
1493struct regulator *regulator_get(struct device *dev, const char *id)
1494{
4ddfebd3 1495 return _regulator_get(dev, id, false, true);
5ffbd136 1496}
414c70cb
LG		 1497EXPORT_SYMBOL_GPL(regulator_get);
1498
5ffbd136
MB		 1499/**
1500 * regulator_get_exclusive - obtain exclusive access to a regulator.
1501 * @dev: device for regulator "consumer"
1502 * @id: Supply name or regulator ID.
1503 *
1504 * Returns a struct regulator corresponding to the regulator producer,
1505 * or IS_ERR() condition containing errno. Other consumers will be
69c3f723
SB		 1506 * unable to obtain this regulator while this reference is held and the
1507 * use count for the regulator will be initialised to reflect the current
1508 * state of the regulator.
5ffbd136
MB		 1509 *
1510 * This is intended for use by consumers which cannot tolerate shared
1511 * use of the regulator such as those which need to force the
1512 * regulator off for correct operation of the hardware they are
1513 * controlling.
1514 *
1515 * Use of supply names configured via regulator_set_device_supply() is
1516 * strongly encouraged. It is recommended that the supply name used
1517 * should match the name used for the supply and/or the relevant
1518 * device pins in the datasheet.
1519 */
1520struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1521{
4ddfebd3 1522 return _regulator_get(dev, id, true, false);
5ffbd136
MB		 1523}
1524EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1525
de1dd9fd
MB		 1526/**
1527 * regulator_get_optional - obtain optional access to a regulator.
1528 * @dev: device for regulator "consumer"
1529 * @id: Supply name or regulator ID.
1530 *
1531 * Returns a struct regulator corresponding to the regulator producer,
69c3f723 1532 * or IS_ERR() condition containing errno.
de1dd9fd
MB		 1533 *
1534 * This is intended for use by consumers for devices which can have
1535 * some supplies unconnected in normal use, such as some MMC devices.
1536 * It can allow the regulator core to provide stub supplies for other
1537 * supplies requested using normal regulator_get() calls without
1538 * disrupting the operation of drivers that can handle absent
1539 * supplies.
1540 *
1541 * Use of supply names configured via regulator_set_device_supply() is
1542 * strongly encouraged. It is recommended that the supply name used
1543 * should match the name used for the supply and/or the relevant
1544 * device pins in the datasheet.
1545 */
1546struct regulator *regulator_get_optional(struct device *dev, const char *id)
1547{
4ddfebd3 1548 return _regulator_get(dev, id, false, false);
de1dd9fd
MB		 1549}
1550EXPORT_SYMBOL_GPL(regulator_get_optional);
1551
83b0302d 1552/* regulator_list_mutex lock held by regulator_put() */
23ff2f0f 1553static void _regulator_put(struct regulator *regulator)
414c70cb
LG		 1554{
1555 struct regulator_dev *rdev;
1556
1557 if (regulator == NULL || IS_ERR(regulator))
1558 return;
1559
414c70cb
LG		 1560 rdev = regulator->rdev;
1561
5de70519 1562 debugfs_remove_recursive(regulator->debugfs);
5de70519 1563
414c70cb 1564 /* remove any sysfs entries */
e2c98eaf 1565 if (regulator->dev)
414c70cb 1566 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
83b0302d 1567 mutex_lock(&rdev->mutex);
5de70519 1568 kfree(regulator->supply_name);
414c70cb
LG		 1569 list_del(&regulator->list);
1570 kfree(regulator);
1571
5ffbd136
MB		 1572 rdev->open_count--;
1573 rdev->exclusive = 0;
83b0302d 1574 mutex_unlock(&rdev->mutex);
5ffbd136 1575
414c70cb 1576 module_put(rdev->owner);
23ff2f0f
CK		 1577}
1578
1579/**
1580 * regulator_put - "free" the regulator source
1581 * @regulator: regulator source
1582 *
1583 * Note: drivers must ensure that all regulator_enable calls made on this
1584 * regulator source are balanced by regulator_disable calls prior to calling
1585 * this function.
1586 */
1587void regulator_put(struct regulator *regulator)
1588{
1589 mutex_lock(&regulator_list_mutex);
1590 _regulator_put(regulator);
414c70cb
LG		 1591 mutex_unlock(&regulator_list_mutex);
1592}
1593EXPORT_SYMBOL_GPL(regulator_put);
1594
a06ccd9c
CK		 1595/**
1596 * regulator_register_supply_alias - Provide device alias for supply lookup
1597 *
1598 * @dev: device that will be given as the regulator "consumer"
1599 * @id: Supply name or regulator ID
1600 * @alias_dev: device that should be used to lookup the supply
1601 * @alias_id: Supply name or regulator ID that should be used to lookup the
1602 * supply
1603 *
1604 * All lookups for id on dev will instead be conducted for alias_id on
1605 * alias_dev.
1606 */
1607int regulator_register_supply_alias(struct device *dev, const char *id,
1608 struct device *alias_dev,
1609 const char *alias_id)
1610{
1611 struct regulator_supply_alias *map;
1612
1613 map = regulator_find_supply_alias(dev, id);
1614 if (map)
1615 return -EEXIST;
1616
1617 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1618 if (!map)
1619 return -ENOMEM;
1620
1621 map->src_dev = dev;
1622 map->src_supply = id;
1623 map->alias_dev = alias_dev;
1624 map->alias_supply = alias_id;
1625
1626 list_add(&map->list, &regulator_supply_alias_list);
1627
1628 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1629 id, dev_name(dev), alias_id, dev_name(alias_dev));
1630
1631 return 0;
1632}
1633EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1634
1635/**
1636 * regulator_unregister_supply_alias - Remove device alias
1637 *
1638 * @dev: device that will be given as the regulator "consumer"
1639 * @id: Supply name or regulator ID
1640 *
1641 * Remove a lookup alias if one exists for id on dev.
1642 */
1643void regulator_unregister_supply_alias(struct device *dev, const char *id)
1644{
1645 struct regulator_supply_alias *map;
1646
1647 map = regulator_find_supply_alias(dev, id);
1648 if (map) {
1649 list_del(&map->list);
1650 kfree(map);
1651 }
1652}
1653EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1654
1655/**
1656 * regulator_bulk_register_supply_alias - register multiple aliases
1657 *
1658 * @dev: device that will be given as the regulator "consumer"
1659 * @id: List of supply names or regulator IDs
1660 * @alias_dev: device that should be used to lookup the supply
1661 * @alias_id: List of supply names or regulator IDs that should be used to
1662 * lookup the supply
1663 * @num_id: Number of aliases to register
1664 *
1665 * @return 0 on success, an errno on failure.
1666 *
1667 * This helper function allows drivers to register several supply
1668 * aliases in one operation. If any of the aliases cannot be
1669 * registered any aliases that were registered will be removed
1670 * before returning to the caller.
1671 */
9f8c0fe9
LJ		 1672int regulator_bulk_register_supply_alias(struct device *dev,
1673 const char *const *id,
a06ccd9c 1674 struct device *alias_dev,
9f8c0fe9 1675 const char *const *alias_id,
a06ccd9c
CK		 1676 int num_id)
1677{
1678 int i;
1679 int ret;
1680
1681 for (i = 0; i < num_id; ++i) {
1682 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1683 alias_id[i]);
1684 if (ret < 0)
1685 goto err;
1686 }
1687
1688 return 0;
1689
1690err:
1691 dev_err(dev,
1692 "Failed to create supply alias %s,%s -> %s,%s\n",
1693 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1694
1695 while (--i >= 0)
1696 regulator_unregister_supply_alias(dev, id[i]);
1697
1698 return ret;
1699}
1700EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1701
1702/**
1703 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1704 *
1705 * @dev: device that will be given as the regulator "consumer"
1706 * @id: List of supply names or regulator IDs
1707 * @num_id: Number of aliases to unregister
1708 *
1709 * This helper function allows drivers to unregister several supply
1710 * aliases in one operation.
1711 */
1712void regulator_bulk_unregister_supply_alias(struct device *dev,
9f8c0fe9 1713 const char *const *id,
a06ccd9c
CK		 1714 int num_id)
1715{
1716 int i;
1717
1718 for (i = 0; i < num_id; ++i)
1719 regulator_unregister_supply_alias(dev, id[i]);
1720}
1721EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1722
1723
f19b00da
KM		 1724/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1725static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1726 const struct regulator_config *config)
1727{
1728 struct regulator_enable_gpio *pin;
778b28b4 1729 struct gpio_desc *gpiod;
f19b00da
KM		 1730 int ret;
1731
778b28b4
RK		 1732 gpiod = gpio_to_desc(config->ena_gpio);
1733
f19b00da 1734 list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
778b28b4 1735 if (pin->gpiod == gpiod) {
f19b00da
KM		 1736 rdev_dbg(rdev, "GPIO %d is already used\n",
1737 config->ena_gpio);
1738 goto update_ena_gpio_to_rdev;
1739 }
1740 }
1741
1742 ret = gpio_request_one(config->ena_gpio,
1743 GPIOF_DIR_OUT | config->ena_gpio_flags,
1744 rdev_get_name(rdev));
1745 if (ret)
1746 return ret;
1747
1748 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1749 if (pin == NULL) {
1750 gpio_free(config->ena_gpio);
1751 return -ENOMEM;
1752 }
1753
778b28b4 1754 pin->gpiod = gpiod;
f19b00da
KM		 1755 pin->ena_gpio_invert = config->ena_gpio_invert;
1756 list_add(&pin->list, &regulator_ena_gpio_list);
1757
1758update_ena_gpio_to_rdev:
1759 pin->request_count++;
1760 rdev->ena_pin = pin;
1761 return 0;
1762}
1763
1764static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1765{
1766 struct regulator_enable_gpio *pin, *n;
1767
1768 if (!rdev->ena_pin)
1769 return;
1770
1771 /* Free the GPIO only in case of no use */
1772 list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
778b28b4 1773 if (pin->gpiod == rdev->ena_pin->gpiod) {
f19b00da
KM		 1774 if (pin->request_count <= 1) {
1775 pin->request_count = 0;
778b28b4 1776 gpiod_put(pin->gpiod);
f19b00da
KM		 1777 list_del(&pin->list);
1778 kfree(pin);
60a2362f
SWK		 1779 rdev->ena_pin = NULL;
1780 return;
f19b00da
KM		 1781 } else {
1782 pin->request_count--;
1783 }
1784 }
1785 }
1786}
1787
967cfb18 1788/**
31d6eebf
RD		 1789 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1790 * @rdev: regulator_dev structure
1791 * @enable: enable GPIO at initial use?
1792 *
967cfb18
KM		 1793 * GPIO is enabled in case of initial use. (enable_count is 0)
1794 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1795 */
1796static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1797{
1798 struct regulator_enable_gpio *pin = rdev->ena_pin;
1799
1800 if (!pin)
1801 return -EINVAL;
1802
1803 if (enable) {
1804 /* Enable GPIO at initial use */
1805 if (pin->enable_count == 0)
778b28b4
RK		 1806 gpiod_set_value_cansleep(pin->gpiod,
1807 !pin->ena_gpio_invert);
967cfb18
KM		 1808
1809 pin->enable_count++;
1810 } else {
1811 if (pin->enable_count > 1) {
1812 pin->enable_count--;
1813 return 0;
1814 }
1815
1816 /* Disable GPIO if not used */
1817 if (pin->enable_count <= 1) {
778b28b4
RK		 1818 gpiod_set_value_cansleep(pin->gpiod,
1819 pin->ena_gpio_invert);
967cfb18
KM		 1820 pin->enable_count = 0;
1821 }
1822 }
1823
1824 return 0;
1825}
1826
79fd1141
GX		 1827/**
1828 * _regulator_enable_delay - a delay helper function
1829 * @delay: time to delay in microseconds
1830 *
1831 * Delay for the requested amount of time as per the guidelines in:
1832 *
1833 * Documentation/timers/timers-howto.txt
1834 *
1835 * The assumption here is that regulators will never be enabled in
1836 * atomic context and therefore sleeping functions can be used.
1837 */
1838static void _regulator_enable_delay(unsigned int delay)
1839{
1840 unsigned int ms = delay / 1000;
1841 unsigned int us = delay % 1000;
1842
1843 if (ms > 0) {
1844 /*
1845 * For small enough values, handle super-millisecond
1846 * delays in the usleep_range() call below.
1847 */
1848 if (ms < 20)
1849 us += ms * 1000;
1850 else
1851 msleep(ms);
1852 }
1853
1854 /*
1855 * Give the scheduler some room to coalesce with any other
1856 * wakeup sources. For delays shorter than 10 us, don't even
1857 * bother setting up high-resolution timers and just busy-
1858 * loop.
1859 */
1860 if (us >= 10)
1861 usleep_range(us, us + 100);
1862 else
1863 udelay(us);
1864}
1865
5c5659d0
MB		 1866static int _regulator_do_enable(struct regulator_dev *rdev)
1867{
1868 int ret, delay;
1869
1870 /* Query before enabling in case configuration dependent. */
1871 ret = _regulator_get_enable_time(rdev);
1872 if (ret >= 0) {
1873 delay = ret;
1874 } else {
1875 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1876 delay = 0;
1877 }
1878
1879 trace_regulator_enable(rdev_get_name(rdev));
1880
871f5650
GX		 1881 if (rdev->desc->off_on_delay) {
1882 /* if needed, keep a distance of off_on_delay from last time
1883 * this regulator was disabled.
1884 */
1885 unsigned long start_jiffy = jiffies;
1886 unsigned long intended, max_delay, remaining;
1887
1888 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
1889 intended = rdev->last_off_jiffy + max_delay;
1890
1891 if (time_before(start_jiffy, intended)) {
1892 /* calc remaining jiffies to deal with one-time
1893 * timer wrapping.
1894 * in case of multiple timer wrapping, either it can be
1895 * detected by out-of-range remaining, or it cannot be
1896 * detected and we gets a panelty of
1897 * _regulator_enable_delay().
1898 */
1899 remaining = intended - start_jiffy;
1900 if (remaining <= max_delay)
1901 _regulator_enable_delay(
1902 jiffies_to_usecs(remaining));
1903 }
1904 }
1905
967cfb18 1906 if (rdev->ena_pin) {
29d62ec5
DA		 1907 if (!rdev->ena_gpio_state) {
1908 ret = regulator_ena_gpio_ctrl(rdev, true);
1909 if (ret < 0)
1910 return ret;
1911 rdev->ena_gpio_state = 1;
1912 }
65f73508 1913 } else if (rdev->desc->ops->enable) {
5c5659d0
MB		 1914 ret = rdev->desc->ops->enable(rdev);
1915 if (ret < 0)
1916 return ret;
1917 } else {
1918 return -EINVAL;
1919 }
1920
1921 /* Allow the regulator to ramp; it would be useful to extend
1922 * this for bulk operations so that the regulators can ramp
1923 * together. */
1924 trace_regulator_enable_delay(rdev_get_name(rdev));
1925
79fd1141 1926 _regulator_enable_delay(delay);
5c5659d0
MB		 1927
1928 trace_regulator_enable_complete(rdev_get_name(rdev));
1929
1930 return 0;
1931}
1932
414c70cb
LG		 1933/* locks held by regulator_enable() */
1934static int _regulator_enable(struct regulator_dev *rdev)
1935{
5c5659d0 1936 int ret;
414c70cb 1937
414c70cb 1938 /* check voltage and requested load before enabling */
9a2372fa
MB		 1939 if (rdev->constraints &&
1940 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1941 drms_uA_update(rdev);
414c70cb 1942
9a2372fa
MB		 1943 if (rdev->use_count == 0) {
1944 /* The regulator may on if it's not switchable or left on */
1945 ret = _regulator_is_enabled(rdev);
1946 if (ret == -EINVAL || ret == 0) {
1947 if (!_regulator_can_change_status(rdev))
1948 return -EPERM;
1949
5c5659d0 1950 ret = _regulator_do_enable(rdev);
31aae2be
MB		 1951 if (ret < 0)
1952 return ret;
1953
a7433cff 1954 } else if (ret < 0) {
5da84fd9 1955 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 1956 return ret;
1957 }
a7433cff 1958 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 1959 }
1960
9a2372fa
MB		 1961 rdev->use_count++;
1962
1963 return 0;
414c70cb
LG		 1964}
1965
1966/**
1967 * regulator_enable - enable regulator output
1968 * @regulator: regulator source
1969 *
cf7bbcdf
MB		 1970 * Request that the regulator be enabled with the regulator output at
1971 * the predefined voltage or current value. Calls to regulator_enable()
1972 * must be balanced with calls to regulator_disable().
1973 *
414c70cb 1974 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 1975 * hardwired in the regulator.
414c70cb
LG		 1976 */
1977int regulator_enable(struct regulator *regulator)
1978{
412aec61
DB		 1979 struct regulator_dev *rdev = regulator->rdev;
1980 int ret = 0;
414c70cb 1981
6492bc1b
MB		 1982 if (regulator->always_on)
1983 return 0;
1984
3801b86a
MB		 1985 if (rdev->supply) {
1986 ret = regulator_enable(rdev->supply);
1987 if (ret != 0)
1988 return ret;
1989 }
1990
412aec61 1991 mutex_lock(&rdev->mutex);
cd94b505 1992 ret = _regulator_enable(rdev);
412aec61 1993 mutex_unlock(&rdev->mutex);
3801b86a 1994
d1685e4e 1995 if (ret != 0 && rdev->supply)
3801b86a
MB		 1996 regulator_disable(rdev->supply);
1997
414c70cb
LG		 1998 return ret;
1999}
2000EXPORT_SYMBOL_GPL(regulator_enable);
2001
5c5659d0
MB		 2002static int _regulator_do_disable(struct regulator_dev *rdev)
2003{
2004 int ret;
2005
2006 trace_regulator_disable(rdev_get_name(rdev));
2007
967cfb18 2008 if (rdev->ena_pin) {
29d62ec5
DA		 2009 if (rdev->ena_gpio_state) {
2010 ret = regulator_ena_gpio_ctrl(rdev, false);
2011 if (ret < 0)
2012 return ret;
2013 rdev->ena_gpio_state = 0;
2014 }
5c5659d0
MB		 2015
2016 } else if (rdev->desc->ops->disable) {
2017 ret = rdev->desc->ops->disable(rdev);
2018 if (ret != 0)
2019 return ret;
2020 }
2021
871f5650
GX		 2022 /* cares about last_off_jiffy only if off_on_delay is required by
2023 * device.
2024 */
2025 if (rdev->desc->off_on_delay)
2026 rdev->last_off_jiffy = jiffies;
2027
5c5659d0
MB		 2028 trace_regulator_disable_complete(rdev_get_name(rdev));
2029
5c5659d0
MB		 2030 return 0;
2031}
2032
414c70cb 2033/* locks held by regulator_disable() */
3801b86a 2034static int _regulator_disable(struct regulator_dev *rdev)
414c70cb
LG		 2035{
2036 int ret = 0;
2037
cd94b505 2038 if (WARN(rdev->use_count <= 0,
43e7ee33 2039 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 2040 return -EIO;
2041
414c70cb 2042 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 2043 if (rdev->use_count == 1 &&
2044 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 2045
2046 /* we are last user */
5c5659d0 2047 if (_regulator_can_change_status(rdev)) {
a1c8a551
RF		 2048 ret = _notifier_call_chain(rdev,
2049 REGULATOR_EVENT_PRE_DISABLE,
2050 NULL);
2051 if (ret & NOTIFY_STOP_MASK)
2052 return -EINVAL;
2053
5c5659d0 2054 ret = _regulator_do_disable(rdev);
414c70cb 2055 if (ret < 0) {
5da84fd9 2056 rdev_err(rdev, "failed to disable\n");
a1c8a551
RF		 2057 _notifier_call_chain(rdev,
2058 REGULATOR_EVENT_ABORT_DISABLE,
2059 NULL);
414c70cb
LG		 2060 return ret;
2061 }
66fda75f
MP		 2062 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2063 NULL);
414c70cb
LG		 2064 }
2065
414c70cb
LG		 2066 rdev->use_count = 0;
2067 } else if (rdev->use_count > 1) {
2068
2069 if (rdev->constraints &&
2070 (rdev->constraints->valid_ops_mask &
2071 REGULATOR_CHANGE_DRMS))
2072 drms_uA_update(rdev);
2073
2074 rdev->use_count--;
2075 }
3801b86a 2076
414c70cb
LG		 2077 return ret;
2078}
2079
2080/**
2081 * regulator_disable - disable regulator output
2082 * @regulator: regulator source
2083 *
cf7bbcdf
MB		 2084 * Disable the regulator output voltage or current. Calls to
2085 * regulator_enable() must be balanced with calls to
2086 * regulator_disable().
69279fb9 2087 *
414c70cb 2088 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 2089 * devices have it enabled, the regulator device supports disabling and
2090 * machine constraints permit this operation.
414c70cb
LG		 2091 */
2092int regulator_disable(struct regulator *regulator)
2093{
412aec61
DB		 2094 struct regulator_dev *rdev = regulator->rdev;
2095 int ret = 0;
414c70cb 2096
6492bc1b
MB		 2097 if (regulator->always_on)
2098 return 0;
2099
412aec61 2100 mutex_lock(&rdev->mutex);
3801b86a 2101 ret = _regulator_disable(rdev);
412aec61 2102 mutex_unlock(&rdev->mutex);
8cbf811d 2103
3801b86a
MB		 2104 if (ret == 0 && rdev->supply)
2105 regulator_disable(rdev->supply);
8cbf811d 2106
414c70cb
LG		 2107 return ret;
2108}
2109EXPORT_SYMBOL_GPL(regulator_disable);
2110
2111/* locks held by regulator_force_disable() */
3801b86a 2112static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 2113{
2114 int ret = 0;
2115
a1c8a551
RF		 2116 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2117 REGULATOR_EVENT_PRE_DISABLE, NULL);
2118 if (ret & NOTIFY_STOP_MASK)
2119 return -EINVAL;
2120
66fda75f
MP		 2121 ret = _regulator_do_disable(rdev);
2122 if (ret < 0) {
2123 rdev_err(rdev, "failed to force disable\n");
a1c8a551
RF		 2124 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2125 REGULATOR_EVENT_ABORT_DISABLE, NULL);
66fda75f 2126 return ret;
414c70cb
LG		 2127 }
2128
66fda75f
MP		 2129 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2130 REGULATOR_EVENT_DISABLE, NULL);
2131
2132 return 0;
414c70cb
LG		 2133}
2134
2135/**
2136 * regulator_force_disable - force disable regulator output
2137 * @regulator: regulator source
2138 *
2139 * Forcibly disable the regulator output voltage or current.
2140 * NOTE: this *will* disable the regulator output even if other consumer
2141 * devices have it enabled. This should be used for situations when device
2142 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2143 */
2144int regulator_force_disable(struct regulator *regulator)
2145{
82d15839 2146 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 2147 int ret;
2148
82d15839 2149 mutex_lock(&rdev->mutex);
414c70cb 2150 regulator->uA_load = 0;
3801b86a 2151 ret = _regulator_force_disable(regulator->rdev);
82d15839 2152 mutex_unlock(&rdev->mutex);
8cbf811d 2153
3801b86a
MB		 2154 if (rdev->supply)
2155 while (rdev->open_count--)
2156 regulator_disable(rdev->supply);
8cbf811d 2157
414c70cb
LG		 2158 return ret;
2159}
2160EXPORT_SYMBOL_GPL(regulator_force_disable);
2161
da07ecd9
MB		 2162static void regulator_disable_work(struct work_struct *work)
2163{
2164 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2165 disable_work.work);
2166 int count, i, ret;
2167
2168 mutex_lock(&rdev->mutex);
2169
2170 BUG_ON(!rdev->deferred_disables);
2171
2172 count = rdev->deferred_disables;
2173 rdev->deferred_disables = 0;
2174
2175 for (i = 0; i < count; i++) {
2176 ret = _regulator_disable(rdev);
2177 if (ret != 0)
2178 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2179 }
2180
2181 mutex_unlock(&rdev->mutex);
2182
2183 if (rdev->supply) {
2184 for (i = 0; i < count; i++) {
2185 ret = regulator_disable(rdev->supply);
2186 if (ret != 0) {
2187 rdev_err(rdev,
2188 "Supply disable failed: %d\n", ret);
2189 }
2190 }
2191 }
2192}
2193
2194/**
2195 * regulator_disable_deferred - disable regulator output with delay
2196 * @regulator: regulator source
2197 * @ms: miliseconds until the regulator is disabled
2198 *
2199 * Execute regulator_disable() on the regulator after a delay. This
2200 * is intended for use with devices that require some time to quiesce.
2201 *
2202 * NOTE: this will only disable the regulator output if no other consumer
2203 * devices have it enabled, the regulator device supports disabling and
2204 * machine constraints permit this operation.
2205 */
2206int regulator_disable_deferred(struct regulator *regulator, int ms)
2207{
2208 struct regulator_dev *rdev = regulator->rdev;
aa59802d 2209 int ret;
da07ecd9 2210
6492bc1b
MB		 2211 if (regulator->always_on)
2212 return 0;
2213
2b5a24a0
MB		 2214 if (!ms)
2215 return regulator_disable(regulator);
2216
da07ecd9
MB		 2217 mutex_lock(&rdev->mutex);
2218 rdev->deferred_disables++;
2219 mutex_unlock(&rdev->mutex);
2220
070260f0
MB		 2221 ret = queue_delayed_work(system_power_efficient_wq,
2222 &rdev->disable_work,
2223 msecs_to_jiffies(ms));
aa59802d
MB		 2224 if (ret < 0)
2225 return ret;
2226 else
2227 return 0;
da07ecd9
MB		 2228}
2229EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2230
414c70cb
LG		 2231static int _regulator_is_enabled(struct regulator_dev *rdev)
2232{
65f73508 2233 /* A GPIO control always takes precedence */
7b74d149 2234 if (rdev->ena_pin)
65f73508
MB		 2235 return rdev->ena_gpio_state;
2236
9a7f6a4c 2237 /* If we don't know then assume that the regulator is always on */
9332546f 2238 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 2239 return 1;
414c70cb 2240
9332546f 2241 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 2242}
2243
2244/**
2245 * regulator_is_enabled - is the regulator output enabled
2246 * @regulator: regulator source
2247 *
412aec61
DB		 2248 * Returns positive if the regulator driver backing the source/client
2249 * has requested that the device be enabled, zero if it hasn't, else a
2250 * negative errno code.
2251 *
2252 * Note that the device backing this regulator handle can have multiple
2253 * users, so it might be enabled even if regulator_enable() was never
2254 * called for this particular source.
414c70cb
LG		 2255 */
2256int regulator_is_enabled(struct regulator *regulator)
2257{
9332546f
MB		 2258 int ret;
2259
6492bc1b
MB		 2260 if (regulator->always_on)
2261 return 1;
2262
9332546f
MB		 2263 mutex_lock(&regulator->rdev->mutex);
2264 ret = _regulator_is_enabled(regulator->rdev);
2265 mutex_unlock(&regulator->rdev->mutex);
2266
2267 return ret;
414c70cb
LG		 2268}
2269EXPORT_SYMBOL_GPL(regulator_is_enabled);
2270
d1e7de30
MS		 2271/**
2272 * regulator_can_change_voltage - check if regulator can change voltage
2273 * @regulator: regulator source
2274 *
2275 * Returns positive if the regulator driver backing the source/client
e227867f 2276 * can change its voltage, false otherwise. Useful for detecting fixed
d1e7de30
MS		 2277 * or dummy regulators and disabling voltage change logic in the client
2278 * driver.
2279 */
2280int regulator_can_change_voltage(struct regulator *regulator)
2281{
2282 struct regulator_dev *rdev = regulator->rdev;
2283
2284 if (rdev->constraints &&
19280e40
AL		 2285 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2286 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2287 return 1;
2288
2289 if (rdev->desc->continuous_voltage_range &&
2290 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2291 rdev->constraints->min_uV != rdev->constraints->max_uV)
2292 return 1;
2293 }
d1e7de30
MS		 2294
2295 return 0;
2296}
2297EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2298
4367cfdc
DB		 2299/**
2300 * regulator_count_voltages - count regulator_list_voltage() selectors
2301 * @regulator: regulator source
2302 *
2303 * Returns number of selectors, or negative errno. Selectors are
2304 * numbered starting at zero, and typically correspond to bitfields
2305 * in hardware registers.
2306 */
2307int regulator_count_voltages(struct regulator *regulator)
2308{
2309 struct regulator_dev *rdev = regulator->rdev;
2310
26988efe
JMC		 2311 if (rdev->desc->n_voltages)
2312 return rdev->desc->n_voltages;
2313
2314 if (!rdev->supply)
2315 return -EINVAL;
2316
2317 return regulator_count_voltages(rdev->supply);
4367cfdc
DB		 2318}
2319EXPORT_SYMBOL_GPL(regulator_count_voltages);
2320
2321/**
2322 * regulator_list_voltage - enumerate supported voltages
2323 * @regulator: regulator source
2324 * @selector: identify voltage to list
2325 * Context: can sleep
2326 *
2327 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 2328 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 2329 * negative errno.
2330 */
2331int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2332{
272e2315
GX		 2333 struct regulator_dev *rdev = regulator->rdev;
2334 const struct regulator_ops *ops = rdev->desc->ops;
2335 int ret;
4367cfdc 2336
f446043f
GL		 2337 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2338 return rdev->desc->fixed_uV;
2339
26988efe
JMC		 2340 if (ops->list_voltage) {
2341 if (selector >= rdev->desc->n_voltages)
2342 return -EINVAL;
2343 mutex_lock(&rdev->mutex);
2344 ret = ops->list_voltage(rdev, selector);
2345 mutex_unlock(&rdev->mutex);
2346 } else if (rdev->supply) {
2347 ret = regulator_list_voltage(rdev->supply, selector);
2348 } else {
4367cfdc 2349 return -EINVAL;
26988efe 2350 }
4367cfdc
DB		 2351
2352 if (ret > 0) {
2353 if (ret < rdev->constraints->min_uV)
2354 ret = 0;
2355 else if (ret > rdev->constraints->max_uV)
2356 ret = 0;
2357 }
2358
2359 return ret;
2360}
2361EXPORT_SYMBOL_GPL(regulator_list_voltage);
2362
04eca28c
TT		 2363/**
2364 * regulator_get_regmap - get the regulator's register map
2365 * @regulator: regulator source
2366 *
2367 * Returns the register map for the given regulator, or an ERR_PTR value
2368 * if the regulator doesn't use regmap.
2369 */
2370struct regmap *regulator_get_regmap(struct regulator *regulator)
2371{
2372 struct regmap *map = regulator->rdev->regmap;
2373
2374 return map ? map : ERR_PTR(-EOPNOTSUPP);
2375}
2376
2377/**
2378 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2379 * @regulator: regulator source
2380 * @vsel_reg: voltage selector register, output parameter
2381 * @vsel_mask: mask for voltage selector bitfield, output parameter
2382 *
2383 * Returns the hardware register offset and bitmask used for setting the
2384 * regulator voltage. This might be useful when configuring voltage-scaling
2385 * hardware or firmware that can make I2C requests behind the kernel's back,
2386 * for example.
2387 *
2388 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2389 * and 0 is returned, otherwise a negative errno is returned.
2390 */
2391int regulator_get_hardware_vsel_register(struct regulator *regulator,
2392 unsigned *vsel_reg,
2393 unsigned *vsel_mask)
2394{
39f5460d
GX		 2395 struct regulator_dev *rdev = regulator->rdev;
2396 const struct regulator_ops *ops = rdev->desc->ops;
04eca28c
TT		 2397
2398 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2399 return -EOPNOTSUPP;
2400
2401 *vsel_reg = rdev->desc->vsel_reg;
2402 *vsel_mask = rdev->desc->vsel_mask;
2403
2404 return 0;
2405}
2406EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2407
2408/**
2409 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2410 * @regulator: regulator source
2411 * @selector: identify voltage to list
2412 *
2413 * Converts the selector to a hardware-specific voltage selector that can be
2414 * directly written to the regulator registers. The address of the voltage
2415 * register can be determined by calling @regulator_get_hardware_vsel_register.
2416 *
2417 * On error a negative errno is returned.
2418 */
2419int regulator_list_hardware_vsel(struct regulator *regulator,
2420 unsigned selector)
2421{
39f5460d
GX		 2422 struct regulator_dev *rdev = regulator->rdev;
2423 const struct regulator_ops *ops = rdev->desc->ops;
04eca28c
TT		 2424
2425 if (selector >= rdev->desc->n_voltages)
2426 return -EINVAL;
2427 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2428 return -EOPNOTSUPP;
2429
2430 return selector;
2431}
2432EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2433
2a668a8b
PW		 2434/**
2435 * regulator_get_linear_step - return the voltage step size between VSEL values
2436 * @regulator: regulator source
2437 *
2438 * Returns the voltage step size between VSEL values for linear
2439 * regulators, or return 0 if the regulator isn't a linear regulator.
2440 */
2441unsigned int regulator_get_linear_step(struct regulator *regulator)
2442{
2443 struct regulator_dev *rdev = regulator->rdev;
2444
2445 return rdev->desc->uV_step;
2446}
2447EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2448
a7a1ad90
MB		 2449/**
2450 * regulator_is_supported_voltage - check if a voltage range can be supported
2451 *
2452 * @regulator: Regulator to check.
2453 * @min_uV: Minimum required voltage in uV.
2454 * @max_uV: Maximum required voltage in uV.
2455 *
2456 * Returns a boolean or a negative error code.
2457 */
2458int regulator_is_supported_voltage(struct regulator *regulator,
2459 int min_uV, int max_uV)
2460{
c5f3939b 2461 struct regulator_dev *rdev = regulator->rdev;
a7a1ad90
MB		 2462 int i, voltages, ret;
2463
c5f3939b
MB		 2464 /* If we can't change voltage check the current voltage */
2465 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2466 ret = regulator_get_voltage(regulator);
2467 if (ret >= 0)
0d25d09d 2468 return min_uV <= ret && ret <= max_uV;
c5f3939b
MB		 2469 else
2470 return ret;
2471 }
2472
bd7a2b60
PM		 2473 /* Any voltage within constrains range is fine? */
2474 if (rdev->desc->continuous_voltage_range)
2475 return min_uV >= rdev->constraints->min_uV &&
2476 max_uV <= rdev->constraints->max_uV;
2477
a7a1ad90
MB		 2478 ret = regulator_count_voltages(regulator);
2479 if (ret < 0)
2480 return ret;
2481 voltages = ret;
2482
2483 for (i = 0; i < voltages; i++) {
2484 ret = regulator_list_voltage(regulator, i);
2485
2486 if (ret >= min_uV && ret <= max_uV)
2487 return 1;
2488 }
2489
2490 return 0;
2491}
a398eaa2 2492EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 2493
7179569a
HS		 2494static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2495 int min_uV, int max_uV,
2496 unsigned *selector)
2497{
2498 struct pre_voltage_change_data data;
2499 int ret;
2500
2501 data.old_uV = _regulator_get_voltage(rdev);
2502 data.min_uV = min_uV;
2503 data.max_uV = max_uV;
2504 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2505 &data);
2506 if (ret & NOTIFY_STOP_MASK)
2507 return -EINVAL;
2508
2509 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2510 if (ret >= 0)
2511 return ret;
2512
2513 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2514 (void *)data.old_uV);
2515
2516 return ret;
2517}
2518
2519static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2520 int uV, unsigned selector)
2521{
2522 struct pre_voltage_change_data data;
2523 int ret;
2524
2525 data.old_uV = _regulator_get_voltage(rdev);
2526 data.min_uV = uV;
2527 data.max_uV = uV;
2528 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2529 &data);
2530 if (ret & NOTIFY_STOP_MASK)
2531 return -EINVAL;
2532
2533 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2534 if (ret >= 0)
2535 return ret;
2536
2537 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2538 (void *)data.old_uV);
2539
2540 return ret;
2541}
2542
75790251
MB		 2543static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2544 int min_uV, int max_uV)
2545{
2546 int ret;
77af1b26 2547 int delay = 0;
e113d792 2548 int best_val = 0;
75790251 2549 unsigned int selector;
eba41a5e 2550 int old_selector = -1;
75790251
MB		 2551
2552 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2553
bf5892a8
MB		 2554 min_uV += rdev->constraints->uV_offset;
2555 max_uV += rdev->constraints->uV_offset;
2556
eba41a5e
AL		 2557 /*
2558 * If we can't obtain the old selector there is not enough
2559 * info to call set_voltage_time_sel().
2560 */
8b7485ef
AL		 2561 if (_regulator_is_enabled(rdev) &&
2562 rdev->desc->ops->set_voltage_time_sel &&
eba41a5e
AL		 2563 rdev->desc->ops->get_voltage_sel) {
2564 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2565 if (old_selector < 0)
2566 return old_selector;
2567 }
2568
75790251 2569 if (rdev->desc->ops->set_voltage) {
7179569a
HS		 2570 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2571 &selector);
e113d792
MB		 2572
2573 if (ret >= 0) {
2574 if (rdev->desc->ops->list_voltage)
2575 best_val = rdev->desc->ops->list_voltage(rdev,
2576 selector);
2577 else
2578 best_val = _regulator_get_voltage(rdev);
2579 }
2580
e8eef82b 2581 } else if (rdev->desc->ops->set_voltage_sel) {
9152c36a 2582 if (rdev->desc->ops->map_voltage) {
e843fc46
MB		 2583 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2584 max_uV);
9152c36a
AL		 2585 } else {
2586 if (rdev->desc->ops->list_voltage ==
2587 regulator_list_voltage_linear)
2588 ret = regulator_map_voltage_linear(rdev,
2589 min_uV, max_uV);
36698627
AL		 2590 else if (rdev->desc->ops->list_voltage ==
2591 regulator_list_voltage_linear_range)
2592 ret = regulator_map_voltage_linear_range(rdev,
2593 min_uV, max_uV);
9152c36a
AL		 2594 else
2595 ret = regulator_map_voltage_iterate(rdev,
2596 min_uV, max_uV);
2597 }
e8eef82b 2598
e843fc46 2599 if (ret >= 0) {
e113d792
MB		 2600 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2601 if (min_uV <= best_val && max_uV >= best_val) {
2602 selector = ret;
c66a566a
AL		 2603 if (old_selector == selector)
2604 ret = 0;
2605 else
7179569a
HS		 2606 ret = _regulator_call_set_voltage_sel(
2607 rdev, best_val, selector);
e113d792
MB		 2608 } else {
2609 ret = -EINVAL;
2610 }
e8eef82b 2611 }
75790251
MB		 2612 } else {
2613 ret = -EINVAL;
2614 }
e8eef82b 2615
eba41a5e 2616 /* Call set_voltage_time_sel if successfully obtained old_selector */
5b175952
YSB		 2617 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2618 && old_selector != selector) {
77af1b26 2619
eba41a5e
AL		 2620 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2621 old_selector, selector);
2622 if (delay < 0) {
2623 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2624 delay);
2625 delay = 0;
e8eef82b 2626 }
75790251 2627
8b96de31
PR		 2628 /* Insert any necessary delays */
2629 if (delay >= 1000) {
2630 mdelay(delay / 1000);
2631 udelay(delay % 1000);
2632 } else if (delay) {
2633 udelay(delay);
2634 }
77af1b26
LW		 2635 }
2636
2f6c797f
AL		 2637 if (ret == 0 && best_val >= 0) {
2638 unsigned long data = best_val;
2639
ded06a52 2640 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2f6c797f
AL		 2641 (void *)data);
2642 }
ded06a52 2643
eba41a5e 2644 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
75790251
MB		 2645
2646 return ret;
2647}
2648
414c70cb
LG		 2649/**
2650 * regulator_set_voltage - set regulator output voltage
2651 * @regulator: regulator source
2652 * @min_uV: Minimum required voltage in uV
2653 * @max_uV: Maximum acceptable voltage in uV
2654 *
2655 * Sets a voltage regulator to the desired output voltage. This can be set
2656 * during any regulator state. IOW, regulator can be disabled or enabled.
2657 *
2658 * If the regulator is enabled then the voltage will change to the new value
2659 * immediately otherwise if the regulator is disabled the regulator will
2660 * output at the new voltage when enabled.
2661 *
2662 * NOTE: If the regulator is shared between several devices then the lowest
2663 * request voltage that meets the system constraints will be used.
69279fb9 2664 * Regulator system constraints must be set for this regulator before
414c70cb
LG		 2665 * calling this function otherwise this call will fail.
2666 */
2667int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2668{
2669 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 2670 int ret = 0;
92d7a558 2671 int old_min_uV, old_max_uV;
c00dc359 2672 int current_uV;
414c70cb
LG		 2673
2674 mutex_lock(&rdev->mutex);
2675
95a3c23a
MB		 2676 /* If we're setting the same range as last time the change
2677 * should be a noop (some cpufreq implementations use the same
2678 * voltage for multiple frequencies, for example).
2679 */
2680 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2681 goto out;
2682
c00dc359
BA		 2683 /* If we're trying to set a range that overlaps the current voltage,
2684 * return succesfully even though the regulator does not support
2685 * changing the voltage.
2686 */
2687 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2688 current_uV = _regulator_get_voltage(rdev);
2689 if (min_uV <= current_uV && current_uV <= max_uV) {
2690 regulator->min_uV = min_uV;
2691 regulator->max_uV = max_uV;
2692 goto out;
2693 }
2694 }
2695
414c70cb 2696 /* sanity check */
e8eef82b
MB		 2697 if (!rdev->desc->ops->set_voltage &&
2698 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 2699 ret = -EINVAL;
2700 goto out;
2701 }
2702
2703 /* constraints check */
2704 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2705 if (ret < 0)
2706 goto out;
0d25d09d 2707
92d7a558
PP		 2708 /* restore original values in case of error */
2709 old_min_uV = regulator->min_uV;
2710 old_max_uV = regulator->max_uV;
414c70cb
LG		 2711 regulator->min_uV = min_uV;
2712 regulator->max_uV = max_uV;
3a93f2a9 2713
05fda3b1
TP		 2714 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2715 if (ret < 0)
92d7a558 2716 goto out2;
05fda3b1 2717
75790251 2718 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
92d7a558
PP		 2719 if (ret < 0)
2720 goto out2;
0d25d09d 2721
414c70cb
LG		 2722out:
2723 mutex_unlock(&rdev->mutex);
2724 return ret;
92d7a558
PP		 2725out2:
2726 regulator->min_uV = old_min_uV;
2727 regulator->max_uV = old_max_uV;
2728 mutex_unlock(&rdev->mutex);
414c70cb
LG		 2729 return ret;
2730}
2731EXPORT_SYMBOL_GPL(regulator_set_voltage);
2732
88cd222b
LW		 2733/**
2734 * regulator_set_voltage_time - get raise/fall time
2735 * @regulator: regulator source
2736 * @old_uV: starting voltage in microvolts
2737 * @new_uV: target voltage in microvolts
2738 *
2739 * Provided with the starting and ending voltage, this function attempts to
2740 * calculate the time in microseconds required to rise or fall to this new
2741 * voltage.
2742 */
2743int regulator_set_voltage_time(struct regulator *regulator,
2744 int old_uV, int new_uV)
2745{
272e2315
GX		 2746 struct regulator_dev *rdev = regulator->rdev;
2747 const struct regulator_ops *ops = rdev->desc->ops;
88cd222b
LW		 2748 int old_sel = -1;
2749 int new_sel = -1;
2750 int voltage;
2751 int i;
2752
2753 /* Currently requires operations to do this */
2754 if (!ops->list_voltage || !ops->set_voltage_time_sel
2755 || !rdev->desc->n_voltages)
2756 return -EINVAL;
2757
2758 for (i = 0; i < rdev->desc->n_voltages; i++) {
2759 /* We only look for exact voltage matches here */
2760 voltage = regulator_list_voltage(regulator, i);
2761 if (voltage < 0)
2762 return -EINVAL;
2763 if (voltage == 0)
2764 continue;
2765 if (voltage == old_uV)
2766 old_sel = i;
2767 if (voltage == new_uV)
2768 new_sel = i;
2769 }
2770
2771 if (old_sel < 0 || new_sel < 0)
2772 return -EINVAL;
2773
2774 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2775}
2776EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2777
98a175b6 2778/**
296c6566
RD		 2779 * regulator_set_voltage_time_sel - get raise/fall time
2780 * @rdev: regulator source device
98a175b6
YSB		 2781 * @old_selector: selector for starting voltage
2782 * @new_selector: selector for target voltage
2783 *
2784 * Provided with the starting and target voltage selectors, this function
2785 * returns time in microseconds required to rise or fall to this new voltage
2786 *
f11d08c3 2787 * Drivers providing ramp_delay in regulation_constraints can use this as their
398715ab 2788 * set_voltage_time_sel() operation.
98a175b6
YSB		 2789 */
2790int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2791 unsigned int old_selector,
2792 unsigned int new_selector)
2793{
398715ab 2794 unsigned int ramp_delay = 0;
f11d08c3 2795 int old_volt, new_volt;
398715ab
AL		 2796
2797 if (rdev->constraints->ramp_delay)
2798 ramp_delay = rdev->constraints->ramp_delay;
2799 else if (rdev->desc->ramp_delay)
2800 ramp_delay = rdev->desc->ramp_delay;
2801
2802 if (ramp_delay == 0) {
6f0b2c69 2803 rdev_warn(rdev, "ramp_delay not set\n");
398715ab 2804 return 0;
6f0b2c69 2805 }
398715ab 2806
f11d08c3
AL		 2807 /* sanity check */
2808 if (!rdev->desc->ops->list_voltage)
2809 return -EINVAL;
398715ab 2810
f11d08c3
AL		 2811 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2812 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2813
2814 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
98a175b6 2815}
b19dbf71 2816EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
98a175b6 2817
606a2562
MB		 2818/**
2819 * regulator_sync_voltage - re-apply last regulator output voltage
2820 * @regulator: regulator source
2821 *
2822 * Re-apply the last configured voltage. This is intended to be used
2823 * where some external control source the consumer is cooperating with
2824 * has caused the configured voltage to change.
2825 */
2826int regulator_sync_voltage(struct regulator *regulator)
2827{
2828 struct regulator_dev *rdev = regulator->rdev;
2829 int ret, min_uV, max_uV;
2830
2831 mutex_lock(&rdev->mutex);
2832
2833 if (!rdev->desc->ops->set_voltage &&
2834 !rdev->desc->ops->set_voltage_sel) {
2835 ret = -EINVAL;
2836 goto out;
2837 }
2838
2839 /* This is only going to work if we've had a voltage configured. */
2840 if (!regulator->min_uV && !regulator->max_uV) {
2841 ret = -EINVAL;
2842 goto out;
2843 }
2844
2845 min_uV = regulator->min_uV;
2846 max_uV = regulator->max_uV;
2847
2848 /* This should be a paranoia check... */
2849 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2850 if (ret < 0)
2851 goto out;
2852
2853 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2854 if (ret < 0)
2855 goto out;
2856
2857 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2858
2859out:
2860 mutex_unlock(&rdev->mutex);
2861 return ret;
2862}
2863EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2864
414c70cb
LG		 2865static int _regulator_get_voltage(struct regulator_dev *rdev)
2866{
bf5892a8 2867 int sel, ret;
476c2d83
MB		 2868
2869 if (rdev->desc->ops->get_voltage_sel) {
2870 sel = rdev->desc->ops->get_voltage_sel(rdev);
2871 if (sel < 0)
2872 return sel;
bf5892a8 2873 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 2874 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 2875 ret = rdev->desc->ops->get_voltage(rdev);
f7df20ec
MB		 2876 } else if (rdev->desc->ops->list_voltage) {
2877 ret = rdev->desc->ops->list_voltage(rdev, 0);
5a523605
LD		 2878 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
2879 ret = rdev->desc->fixed_uV;
e303996e
JMC		 2880 } else if (rdev->supply) {
2881 ret = regulator_get_voltage(rdev->supply);
cb220d16 2882 } else {
414c70cb 2883 return -EINVAL;
cb220d16 2884 }
bf5892a8 2885
cb220d16
AL		 2886 if (ret < 0)
2887 return ret;
bf5892a8 2888 return ret - rdev->constraints->uV_offset;
414c70cb
LG		 2889}
2890
2891/**
2892 * regulator_get_voltage - get regulator output voltage
2893 * @regulator: regulator source
2894 *
2895 * This returns the current regulator voltage in uV.
2896 *
2897 * NOTE: If the regulator is disabled it will return the voltage value. This
2898 * function should not be used to determine regulator state.
2899 */
2900int regulator_get_voltage(struct regulator *regulator)
2901{
2902 int ret;
2903
2904 mutex_lock(&regulator->rdev->mutex);
2905
2906 ret = _regulator_get_voltage(regulator->rdev);
2907
2908 mutex_unlock(&regulator->rdev->mutex);
2909
2910 return ret;
2911}
2912EXPORT_SYMBOL_GPL(regulator_get_voltage);
2913
2914/**
2915 * regulator_set_current_limit - set regulator output current limit
2916 * @regulator: regulator source
ce0d10f8 2917 * @min_uA: Minimum supported current in uA
414c70cb
LG		 2918 * @max_uA: Maximum supported current in uA
2919 *
2920 * Sets current sink to the desired output current. This can be set during
2921 * any regulator state. IOW, regulator can be disabled or enabled.
2922 *
2923 * If the regulator is enabled then the current will change to the new value
2924 * immediately otherwise if the regulator is disabled the regulator will
2925 * output at the new current when enabled.
2926 *
2927 * NOTE: Regulator system constraints must be set for this regulator before
2928 * calling this function otherwise this call will fail.
2929 */
2930int regulator_set_current_limit(struct regulator *regulator,
2931 int min_uA, int max_uA)
2932{
2933 struct regulator_dev *rdev = regulator->rdev;
2934 int ret;
2935
2936 mutex_lock(&rdev->mutex);
2937
2938 /* sanity check */
2939 if (!rdev->desc->ops->set_current_limit) {
2940 ret = -EINVAL;
2941 goto out;
2942 }
2943
2944 /* constraints check */
2945 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2946 if (ret < 0)
2947 goto out;
2948
2949 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2950out:
2951 mutex_unlock(&rdev->mutex);
2952 return ret;
2953}
2954EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2955
2956static int _regulator_get_current_limit(struct regulator_dev *rdev)
2957{
2958 int ret;
2959
2960 mutex_lock(&rdev->mutex);
2961
2962 /* sanity check */
2963 if (!rdev->desc->ops->get_current_limit) {
2964 ret = -EINVAL;
2965 goto out;
2966 }
2967
2968 ret = rdev->desc->ops->get_current_limit(rdev);
2969out:
2970 mutex_unlock(&rdev->mutex);
2971 return ret;
2972}
2973
2974/**
2975 * regulator_get_current_limit - get regulator output current
2976 * @regulator: regulator source
2977 *
2978 * This returns the current supplied by the specified current sink in uA.
2979 *
2980 * NOTE: If the regulator is disabled it will return the current value. This
2981 * function should not be used to determine regulator state.
2982 */
2983int regulator_get_current_limit(struct regulator *regulator)
2984{
2985 return _regulator_get_current_limit(regulator->rdev);
2986}
2987EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2988
2989/**
2990 * regulator_set_mode - set regulator operating mode
2991 * @regulator: regulator source
2992 * @mode: operating mode - one of the REGULATOR_MODE constants
2993 *
2994 * Set regulator operating mode to increase regulator efficiency or improve
2995 * regulation performance.
2996 *
2997 * NOTE: Regulator system constraints must be set for this regulator before
2998 * calling this function otherwise this call will fail.
2999 */
3000int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3001{
3002 struct regulator_dev *rdev = regulator->rdev;
3003 int ret;
500b4ac9 3004 int regulator_curr_mode;
414c70cb
LG		 3005
3006 mutex_lock(&rdev->mutex);
3007
3008 /* sanity check */
3009 if (!rdev->desc->ops->set_mode) {
3010 ret = -EINVAL;
3011 goto out;
3012 }
3013
500b4ac9
SI		 3014 /* return if the same mode is requested */
3015 if (rdev->desc->ops->get_mode) {
3016 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3017 if (regulator_curr_mode == mode) {
3018 ret = 0;
3019 goto out;
3020 }
3021 }
3022
414c70cb 3023 /* constraints check */
22c51b47 3024 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 3025 if (ret < 0)
3026 goto out;
3027
3028 ret = rdev->desc->ops->set_mode(rdev, mode);
3029out:
3030 mutex_unlock(&rdev->mutex);
3031 return ret;
3032}
3033EXPORT_SYMBOL_GPL(regulator_set_mode);
3034
3035static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3036{
3037 int ret;
3038
3039 mutex_lock(&rdev->mutex);
3040
3041 /* sanity check */
3042 if (!rdev->desc->ops->get_mode) {
3043 ret = -EINVAL;
3044 goto out;
3045 }
3046
3047 ret = rdev->desc->ops->get_mode(rdev);
3048out:
3049 mutex_unlock(&rdev->mutex);
3050 return ret;
3051}
3052
3053/**
3054 * regulator_get_mode - get regulator operating mode
3055 * @regulator: regulator source
3056 *
3057 * Get the current regulator operating mode.
3058 */
3059unsigned int regulator_get_mode(struct regulator *regulator)
3060{
3061 return _regulator_get_mode(regulator->rdev);
3062}
3063EXPORT_SYMBOL_GPL(regulator_get_mode);
3064
3065/**
e39ce48f 3066 * regulator_set_load - set regulator load
414c70cb
LG		 3067 * @regulator: regulator source
3068 * @uA_load: load current
3069 *
3070 * Notifies the regulator core of a new device load. This is then used by
3071 * DRMS (if enabled by constraints) to set the most efficient regulator
3072 * operating mode for the new regulator loading.
3073 *
3074 * Consumer devices notify their supply regulator of the maximum power
3075 * they will require (can be taken from device datasheet in the power
3076 * consumption tables) when they change operational status and hence power
3077 * state. Examples of operational state changes that can affect power
3078 * consumption are :-
3079 *
3080 * o Device is opened / closed.
3081 * o Device I/O is about to begin or has just finished.
3082 * o Device is idling in between work.
3083 *
3084 * This information is also exported via sysfs to userspace.
3085 *
3086 * DRMS will sum the total requested load on the regulator and change
3087 * to the most efficient operating mode if platform constraints allow.
3088 *
e39ce48f 3089 * On error a negative errno is returned.
414c70cb 3090 */
e39ce48f 3091int regulator_set_load(struct regulator *regulator, int uA_load)
414c70cb
LG		 3092{
3093 struct regulator_dev *rdev = regulator->rdev;
8460ef38 3094 int ret;
d92d95b6 3095
414c70cb 3096 mutex_lock(&rdev->mutex);
414c70cb 3097 regulator->uA_load = uA_load;
8460ef38 3098 ret = drms_uA_update(rdev);
414c70cb 3099 mutex_unlock(&rdev->mutex);
8460ef38 3100
414c70cb
LG		 3101 return ret;
3102}
e39ce48f 3103EXPORT_SYMBOL_GPL(regulator_set_load);
414c70cb 3104
f59c8f9f
MB		 3105/**
3106 * regulator_allow_bypass - allow the regulator to go into bypass mode
3107 *
3108 * @regulator: Regulator to configure
9345dfb8 3109 * @enable: enable or disable bypass mode
f59c8f9f
MB		 3110 *
3111 * Allow the regulator to go into bypass mode if all other consumers
3112 * for the regulator also enable bypass mode and the machine
3113 * constraints allow this. Bypass mode means that the regulator is
3114 * simply passing the input directly to the output with no regulation.
3115 */
3116int regulator_allow_bypass(struct regulator *regulator, bool enable)
3117{
3118 struct regulator_dev *rdev = regulator->rdev;
3119 int ret = 0;
3120
3121 if (!rdev->desc->ops->set_bypass)
3122 return 0;
3123
3124 if (rdev->constraints &&
3125 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3126 return 0;
3127
3128 mutex_lock(&rdev->mutex);
3129
3130 if (enable && !regulator->bypass) {
3131 rdev->bypass_count++;
3132
3133 if (rdev->bypass_count == rdev->open_count) {
3134 ret = rdev->desc->ops->set_bypass(rdev, enable);
3135 if (ret != 0)
3136 rdev->bypass_count--;
3137 }
3138
3139 } else if (!enable && regulator->bypass) {
3140 rdev->bypass_count--;
3141
3142 if (rdev->bypass_count != rdev->open_count) {
3143 ret = rdev->desc->ops->set_bypass(rdev, enable);
3144 if (ret != 0)
3145 rdev->bypass_count++;
3146 }
3147 }
3148
3149 if (ret == 0)
3150 regulator->bypass = enable;
3151
3152 mutex_unlock(&rdev->mutex);
3153
3154 return ret;
3155}
3156EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3157
414c70cb
LG		 3158/**
3159 * regulator_register_notifier - register regulator event notifier
3160 * @regulator: regulator source
69279fb9 3161 * @nb: notifier block
414c70cb
LG		 3162 *
3163 * Register notifier block to receive regulator events.
3164 */
3165int regulator_register_notifier(struct regulator *regulator,
3166 struct notifier_block *nb)
3167{
3168 return blocking_notifier_chain_register(&regulator->rdev->notifier,
3169 nb);
3170}
3171EXPORT_SYMBOL_GPL(regulator_register_notifier);
3172
3173/**
3174 * regulator_unregister_notifier - unregister regulator event notifier
3175 * @regulator: regulator source
69279fb9 3176 * @nb: notifier block
414c70cb
LG		 3177 *
3178 * Unregister regulator event notifier block.
3179 */
3180int regulator_unregister_notifier(struct regulator *regulator,
3181 struct notifier_block *nb)
3182{
3183 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
3184 nb);
3185}
3186EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3187
b136fb44
JC		 3188/* notify regulator consumers and downstream regulator consumers.
3189 * Note mutex must be held by caller.
3190 */
7179569a 3191static int _notifier_call_chain(struct regulator_dev *rdev,
414c70cb
LG		 3192 unsigned long event, void *data)
3193{
414c70cb 3194 /* call rdev chain first */
7179569a 3195 return blocking_notifier_call_chain(&rdev->notifier, event, data);
414c70cb
LG		 3196}
3197
3198/**
3199 * regulator_bulk_get - get multiple regulator consumers
3200 *
3201 * @dev: Device to supply
3202 * @num_consumers: Number of consumers to register
3203 * @consumers: Configuration of consumers; clients are stored here.
3204 *
3205 * @return 0 on success, an errno on failure.
3206 *
3207 * This helper function allows drivers to get several regulator
3208 * consumers in one operation. If any of the regulators cannot be
3209 * acquired then any regulators that were allocated will be freed
3210 * before returning to the caller.
3211 */
3212int regulator_bulk_get(struct device *dev, int num_consumers,
3213 struct regulator_bulk_data *consumers)
3214{
3215 int i;
3216 int ret;
3217
3218 for (i = 0; i < num_consumers; i++)
3219 consumers[i].consumer = NULL;
3220
3221 for (i = 0; i < num_consumers; i++) {
3222 consumers[i].consumer = regulator_get(dev,
3223 consumers[i].supply);
3224 if (IS_ERR(consumers[i].consumer)) {
414c70cb 3225 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 3226 dev_err(dev, "Failed to get supply '%s': %d\n",
3227 consumers[i].supply, ret);
414c70cb
LG		 3228 consumers[i].consumer = NULL;
3229 goto err;
3230 }
3231 }
3232
3233 return 0;
3234
3235err:
b29c7690 3236 while (--i >= 0)
414c70cb
LG		 3237 regulator_put(consumers[i].consumer);
3238
3239 return ret;
3240}
3241EXPORT_SYMBOL_GPL(regulator_bulk_get);
3242
f21e0e81
MB		 3243static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3244{
3245 struct regulator_bulk_data *bulk = data;
3246
3247 bulk->ret = regulator_enable(bulk->consumer);
3248}
3249
414c70cb
LG		 3250/**
3251 * regulator_bulk_enable - enable multiple regulator consumers
3252 *
3253 * @num_consumers: Number of consumers
3254 * @consumers: Consumer data; clients are stored here.
3255 * @return 0 on success, an errno on failure
3256 *
3257 * This convenience API allows consumers to enable multiple regulator
3258 * clients in a single API call. If any consumers cannot be enabled
3259 * then any others that were enabled will be disabled again prior to
3260 * return.
3261 */
3262int regulator_bulk_enable(int num_consumers,
3263 struct regulator_bulk_data *consumers)
3264{
2955b47d 3265 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
414c70cb 3266 int i;
f21e0e81 3267 int ret = 0;
414c70cb 3268
6492bc1b
MB		 3269 for (i = 0; i < num_consumers; i++) {
3270 if (consumers[i].consumer->always_on)
3271 consumers[i].ret = 0;
3272 else
3273 async_schedule_domain(regulator_bulk_enable_async,
3274 &consumers[i], &async_domain);
3275 }
f21e0e81
MB		 3276
3277 async_synchronize_full_domain(&async_domain);
3278
3279 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 3280 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 3281 if (consumers[i].ret != 0) {
3282 ret = consumers[i].ret;
414c70cb 3283 goto err;
f21e0e81 3284 }
414c70cb
LG		 3285 }
3286
3287 return 0;
3288
3289err:
fbe31057
AH		 3290 for (i = 0; i < num_consumers; i++) {
3291 if (consumers[i].ret < 0)
3292 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3293 consumers[i].ret);
3294 else
3295 regulator_disable(consumers[i].consumer);
3296 }
414c70cb
LG		 3297
3298 return ret;
3299}
3300EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3301
3302/**
3303 * regulator_bulk_disable - disable multiple regulator consumers
3304 *
3305 * @num_consumers: Number of consumers
3306 * @consumers: Consumer data; clients are stored here.
3307 * @return 0 on success, an errno on failure
3308 *
3309 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 3310 * clients in a single API call. If any consumers cannot be disabled
3311 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 3312 * return.
3313 */
3314int regulator_bulk_disable(int num_consumers,
3315 struct regulator_bulk_data *consumers)
3316{
3317 int i;
01e86f49 3318 int ret, r;
414c70cb 3319
49e22632 3320 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 3321 ret = regulator_disable(consumers[i].consumer);
3322 if (ret != 0)
3323 goto err;
3324 }
3325
3326 return 0;
3327
3328err:
5da84fd9 3329 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
01e86f49
MB		 3330 for (++i; i < num_consumers; ++i) {
3331 r = regulator_enable(consumers[i].consumer);
3332 if (r != 0)
3333 pr_err("Failed to reename %s: %d\n",
3334 consumers[i].supply, r);
3335 }
414c70cb
LG		 3336
3337 return ret;
3338}
3339EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3340
e1de2f42
DK		 3341/**
3342 * regulator_bulk_force_disable - force disable multiple regulator consumers
3343 *
3344 * @num_consumers: Number of consumers
3345 * @consumers: Consumer data; clients are stored here.
3346 * @return 0 on success, an errno on failure
3347 *
3348 * This convenience API allows consumers to forcibly disable multiple regulator
3349 * clients in a single API call.
3350 * NOTE: This should be used for situations when device damage will
3351 * likely occur if the regulators are not disabled (e.g. over temp).
3352 * Although regulator_force_disable function call for some consumers can
3353 * return error numbers, the function is called for all consumers.
3354 */
3355int regulator_bulk_force_disable(int num_consumers,
3356 struct regulator_bulk_data *consumers)
3357{
3358 int i;
3359 int ret;
3360
3361 for (i = 0; i < num_consumers; i++)
3362 consumers[i].ret =
3363 regulator_force_disable(consumers[i].consumer);
3364
3365 for (i = 0; i < num_consumers; i++) {
3366 if (consumers[i].ret != 0) {
3367 ret = consumers[i].ret;
3368 goto out;
3369 }
3370 }
3371
3372 return 0;
3373out:
3374 return ret;
3375}
3376EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3377
414c70cb
LG		 3378/**
3379 * regulator_bulk_free - free multiple regulator consumers
3380 *
3381 * @num_consumers: Number of consumers
3382 * @consumers: Consumer data; clients are stored here.
3383 *
3384 * This convenience API allows consumers to free multiple regulator
3385 * clients in a single API call.
3386 */
3387void regulator_bulk_free(int num_consumers,
3388 struct regulator_bulk_data *consumers)
3389{
3390 int i;
3391
3392 for (i = 0; i < num_consumers; i++) {
3393 regulator_put(consumers[i].consumer);
3394 consumers[i].consumer = NULL;
3395 }
3396}
3397EXPORT_SYMBOL_GPL(regulator_bulk_free);
3398
3399/**
3400 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 3401 * @rdev: regulator source
414c70cb 3402 * @event: notifier block
69279fb9 3403 * @data: callback-specific data.
414c70cb
LG		 3404 *
3405 * Called by regulator drivers to notify clients a regulator event has
3406 * occurred. We also notify regulator clients downstream.
b136fb44 3407 * Note lock must be held by caller.
414c70cb
LG		 3408 */
3409int regulator_notifier_call_chain(struct regulator_dev *rdev,
3410 unsigned long event, void *data)
3411{
3412 _notifier_call_chain(rdev, event, data);
3413 return NOTIFY_DONE;
3414
3415}
3416EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3417
be721979
MB		 3418/**
3419 * regulator_mode_to_status - convert a regulator mode into a status
3420 *
3421 * @mode: Mode to convert
3422 *
3423 * Convert a regulator mode into a status.
3424 */
3425int regulator_mode_to_status(unsigned int mode)
3426{
3427 switch (mode) {
3428 case REGULATOR_MODE_FAST:
3429 return REGULATOR_STATUS_FAST;
3430 case REGULATOR_MODE_NORMAL:
3431 return REGULATOR_STATUS_NORMAL;
3432 case REGULATOR_MODE_IDLE:
3433 return REGULATOR_STATUS_IDLE;
03ffcf3d 3434 case REGULATOR_MODE_STANDBY:
be721979
MB		 3435 return REGULATOR_STATUS_STANDBY;
3436 default:
1beaf762 3437 return REGULATOR_STATUS_UNDEFINED;
be721979
MB		 3438 }
3439}
3440EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3441
39f802d6
TI		 3442static struct attribute *regulator_dev_attrs[] = {
3443 &dev_attr_name.attr,
3444 &dev_attr_num_users.attr,
3445 &dev_attr_type.attr,
3446 &dev_attr_microvolts.attr,
3447 &dev_attr_microamps.attr,
3448 &dev_attr_opmode.attr,
3449 &dev_attr_state.attr,
3450 &dev_attr_status.attr,
3451 &dev_attr_bypass.attr,
3452 &dev_attr_requested_microamps.attr,
3453 &dev_attr_min_microvolts.attr,
3454 &dev_attr_max_microvolts.attr,
3455 &dev_attr_min_microamps.attr,
3456 &dev_attr_max_microamps.attr,
3457 &dev_attr_suspend_standby_state.attr,
3458 &dev_attr_suspend_mem_state.attr,
3459 &dev_attr_suspend_disk_state.attr,
3460 &dev_attr_suspend_standby_microvolts.attr,
3461 &dev_attr_suspend_mem_microvolts.attr,
3462 &dev_attr_suspend_disk_microvolts.attr,
3463 &dev_attr_suspend_standby_mode.attr,
3464 &dev_attr_suspend_mem_mode.attr,
3465 &dev_attr_suspend_disk_mode.attr,
3466 NULL
3467};
3468
7ad68e2f
DB		 3469/*
3470 * To avoid cluttering sysfs (and memory) with useless state, only
3471 * create attributes that can be meaningfully displayed.
3472 */
39f802d6
TI		 3473static umode_t regulator_attr_is_visible(struct kobject *kobj,
3474 struct attribute *attr, int idx)
7ad68e2f 3475{
39f802d6
TI		 3476 struct device *dev = kobj_to_dev(kobj);
3477 struct regulator_dev *rdev = container_of(dev, struct regulator_dev, dev);
272e2315 3478 const struct regulator_ops *ops = rdev->desc->ops;
39f802d6
TI		 3479 umode_t mode = attr->mode;
3480
3481 /* these three are always present */
3482 if (attr == &dev_attr_name.attr ||
3483 attr == &dev_attr_num_users.attr ||
3484 attr == &dev_attr_type.attr)
3485 return mode;
7ad68e2f
DB		 3486
3487 /* some attributes need specific methods to be displayed */
39f802d6
TI		 3488 if (attr == &dev_attr_microvolts.attr) {
3489 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3490 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3491 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3492 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3493 return mode;
3494 return 0;
f59c8f9f 3495 }
7ad68e2f 3496
39f802d6
TI		 3497 if (attr == &dev_attr_microamps.attr)
3498 return ops->get_current_limit ? mode : 0;
3499
3500 if (attr == &dev_attr_opmode.attr)
3501 return ops->get_mode ? mode : 0;
3502
3503 if (attr == &dev_attr_state.attr)
3504 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3505
3506 if (attr == &dev_attr_status.attr)
3507 return ops->get_status ? mode : 0;
3508
3509 if (attr == &dev_attr_bypass.attr)
3510 return ops->get_bypass ? mode : 0;
3511
7ad68e2f 3512 /* some attributes are type-specific */
39f802d6
TI		 3513 if (attr == &dev_attr_requested_microamps.attr)
3514 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
7ad68e2f 3515
7ad68e2f 3516 /* constraints need specific supporting methods */
39f802d6
TI		 3517 if (attr == &dev_attr_min_microvolts.attr ||
3518 attr == &dev_attr_max_microvolts.attr)
3519 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3520
3521 if (attr == &dev_attr_min_microamps.attr ||
3522 attr == &dev_attr_max_microamps.attr)
3523 return ops->set_current_limit ? mode : 0;
3524
3525 if (attr == &dev_attr_suspend_standby_state.attr ||
3526 attr == &dev_attr_suspend_mem_state.attr ||
3527 attr == &dev_attr_suspend_disk_state.attr)
3528 return mode;
3529
3530 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3531 attr == &dev_attr_suspend_mem_microvolts.attr ||
3532 attr == &dev_attr_suspend_disk_microvolts.attr)
3533 return ops->set_suspend_voltage ? mode : 0;
3534
3535 if (attr == &dev_attr_suspend_standby_mode.attr ||
3536 attr == &dev_attr_suspend_mem_mode.attr ||
3537 attr == &dev_attr_suspend_disk_mode.attr)
3538 return ops->set_suspend_mode ? mode : 0;
3539
3540 return mode;
3541}
3542
3543static const struct attribute_group regulator_dev_group = {
3544 .attrs = regulator_dev_attrs,
3545 .is_visible = regulator_attr_is_visible,
3546};
3547
3548static const struct attribute_group *regulator_dev_groups[] = {
3549 &regulator_dev_group,
3550 NULL
3551};
7ad68e2f 3552
39f802d6
TI		 3553static void regulator_dev_release(struct device *dev)
3554{
3555 struct regulator_dev *rdev = dev_get_drvdata(dev);
3556 kfree(rdev);
7ad68e2f
DB		 3557}
3558
39f802d6
TI		 3559static struct class regulator_class = {
3560 .name = "regulator",
3561 .dev_release = regulator_dev_release,
3562 .dev_groups = regulator_dev_groups,
3563};
3564
1130e5b3
MB		 3565static void rdev_init_debugfs(struct regulator_dev *rdev)
3566{
a9eaa813
GR		 3567 struct device *parent = rdev->dev.parent;
3568 const char *rname = rdev_get_name(rdev);
3569 char name[NAME_MAX];
3570
3571 /* Avoid duplicate debugfs directory names */
3572 if (parent && rname == rdev->desc->name) {
3573 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3574 rname);
3575 rname = name;
3576 }
3577
3578 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
24751434 3579 if (!rdev->debugfs) {
1130e5b3 3580 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 3581 return;
3582 }
3583
3584 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3585 &rdev->use_count);
3586 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3587 &rdev->open_count);
f59c8f9f
MB		 3588 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3589 &rdev->bypass_count);
1130e5b3
MB		 3590}
3591
414c70cb
LG		 3592/**
3593 * regulator_register - register regulator
69279fb9 3594 * @regulator_desc: regulator to register
f47531b1 3595 * @cfg: runtime configuration for regulator
414c70cb
LG		 3596 *
3597 * Called by regulator drivers to register a regulator.
0384618a
AL		 3598 * Returns a valid pointer to struct regulator_dev on success
3599 * or an ERR_PTR() on error.
414c70cb 3600 */
65f26846
MB		 3601struct regulator_dev *
3602regulator_register(const struct regulator_desc *regulator_desc,
1b3de223 3603 const struct regulator_config *cfg)
414c70cb 3604{
9a8f5e07 3605 const struct regulation_constraints *constraints = NULL;
c172708d 3606 const struct regulator_init_data *init_data;
1b3de223 3607 struct regulator_config *config = NULL;
72dca06f 3608 static atomic_t regulator_no = ATOMIC_INIT(-1);
414c70cb 3609 struct regulator_dev *rdev;
32c8fad4 3610 struct device *dev;
a5766f11 3611 int ret, i;
414c70cb 3612
1b3de223 3613 if (regulator_desc == NULL || cfg == NULL)
414c70cb
LG		 3614 return ERR_PTR(-EINVAL);
3615
1b3de223 3616 dev = cfg->dev;
dcf70112 3617 WARN_ON(!dev);
32c8fad4 3618
414c70cb
LG		 3619 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3620 return ERR_PTR(-EINVAL);
3621
cd78dfc6
DL		 3622 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3623 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 3624 return ERR_PTR(-EINVAL);
3625
476c2d83
MB		 3626 /* Only one of each should be implemented */
3627 WARN_ON(regulator_desc->ops->get_voltage &&
3628 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 3629 WARN_ON(regulator_desc->ops->set_voltage &&
3630 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 3631
3632 /* If we're using selectors we must implement list_voltage. */
3633 if (regulator_desc->ops->get_voltage_sel &&
3634 !regulator_desc->ops->list_voltage) {
3635 return ERR_PTR(-EINVAL);
3636 }
e8eef82b
MB		 3637 if (regulator_desc->ops->set_voltage_sel &&
3638 !regulator_desc->ops->list_voltage) {
3639 return ERR_PTR(-EINVAL);
3640 }
476c2d83 3641
414c70cb
LG		 3642 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3643 if (rdev == NULL)
3644 return ERR_PTR(-ENOMEM);
3645
1b3de223
KK		 3646 /*
3647 * Duplicate the config so the driver could override it after
3648 * parsing init data.
3649 */
3650 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
3651 if (config == NULL) {
3652 kfree(rdev);
3653 return ERR_PTR(-ENOMEM);
3654 }
3655
bfa21a0d 3656 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
a0c7b164
MB		 3657 &rdev->dev.of_node);
3658 if (!init_data) {
3659 init_data = config->init_data;
3660 rdev->dev.of_node = of_node_get(config->of_node);
3661 }
3662
414c70cb
LG		 3663 mutex_lock(&regulator_list_mutex);
3664
3665 mutex_init(&rdev->mutex);
c172708d 3666 rdev->reg_data = config->driver_data;
414c70cb
LG		 3667 rdev->owner = regulator_desc->owner;
3668 rdev->desc = regulator_desc;
3a4b0a07
MB		 3669 if (config->regmap)
3670 rdev->regmap = config->regmap;
52b84dac 3671 else if (dev_get_regmap(dev, NULL))
3a4b0a07 3672 rdev->regmap = dev_get_regmap(dev, NULL);
52b84dac
AC		 3673 else if (dev->parent)
3674 rdev->regmap = dev_get_regmap(dev->parent, NULL);
414c70cb 3675 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 3676 INIT_LIST_HEAD(&rdev->list);
414c70cb 3677 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 3678 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 3679
a5766f11 3680 /* preform any regulator specific init */
9a8f5e07 3681 if (init_data && init_data->regulator_init) {
a5766f11 3682 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 3683 if (ret < 0)
3684 goto clean;
a5766f11
LG		 3685 }
3686
a5766f11 3687 /* register with sysfs */
414c70cb 3688 rdev->dev.class = &regulator_class;
a5766f11 3689 rdev->dev.parent = dev;
72dca06f 3690 dev_set_name(&rdev->dev, "regulator.%lu",
39138818 3691 (unsigned long) atomic_inc_return(&regulator_no));
a5766f11 3692 ret = device_register(&rdev->dev);
ad7725cb
VK		 3693 if (ret != 0) {
3694 put_device(&rdev->dev);
4fca9545 3695 goto clean;
ad7725cb 3696 }
a5766f11
LG		 3697
3698 dev_set_drvdata(&rdev->dev, rdev);
3699
76f439df
MP		 3700 if ((config->ena_gpio || config->ena_gpio_initialized) &&
3701 gpio_is_valid(config->ena_gpio)) {
f19b00da 3702 ret = regulator_ena_gpio_request(rdev, config);
65f73508
MB		 3703 if (ret != 0) {
3704 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3705 config->ena_gpio, ret);
b2da55d9 3706 goto wash;
65f73508 3707 }
65f73508
MB		 3708 }
3709
74f544c1 3710 /* set regulator constraints */
9a8f5e07
MB		 3711 if (init_data)
3712 constraints = &init_data->constraints;
3713
3714 ret = set_machine_constraints(rdev, constraints);
74f544c1
MR		 3715 if (ret < 0)
3716 goto scrub;
3717
9a8f5e07 3718 if (init_data && init_data->supply_regulator)
6261b06d 3719 rdev->supply_name = init_data->supply_regulator;
69511a45 3720 else if (regulator_desc->supply_name)
6261b06d 3721 rdev->supply_name = regulator_desc->supply_name;
0178f3e2 3722
a5766f11 3723 /* add consumers devices */
9a8f5e07
MB		 3724 if (init_data) {
3725 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3726 ret = set_consumer_device_supply(rdev,
9a8f5e07 3727 init_data->consumer_supplies[i].dev_name,
23c2f041 3728 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 3729 if (ret < 0) {
3730 dev_err(dev, "Failed to set supply %s\n",
3731 init_data->consumer_supplies[i].supply);
3732 goto unset_supplies;
3733 }
23c2f041 3734 }
414c70cb 3735 }
a5766f11
LG		 3736
3737 list_add(&rdev->list, &regulator_list);
1130e5b3
MB		 3738
3739 rdev_init_debugfs(rdev);
a5766f11 3740out:
414c70cb 3741 mutex_unlock(&regulator_list_mutex);
1b3de223 3742 kfree(config);
414c70cb 3743 return rdev;
4fca9545 3744
d4033b54
JN		 3745unset_supplies:
3746 unset_regulator_supplies(rdev);
3747
4fca9545 3748scrub:
f19b00da 3749 regulator_ena_gpio_free(rdev);
1a6958e7 3750 kfree(rdev->constraints);
b2da55d9 3751wash:
4fca9545 3752 device_unregister(&rdev->dev);
53032daf
PW		 3753 /* device core frees rdev */
3754 rdev = ERR_PTR(ret);
3755 goto out;
3756
4fca9545
DB		 3757clean:
3758 kfree(rdev);
3759 rdev = ERR_PTR(ret);
3760 goto out;
414c70cb
LG		 3761}
3762EXPORT_SYMBOL_GPL(regulator_register);
3763
3764/**
3765 * regulator_unregister - unregister regulator
69279fb9 3766 * @rdev: regulator to unregister
414c70cb
LG		 3767 *
3768 * Called by regulator drivers to unregister a regulator.
3769 */
3770void regulator_unregister(struct regulator_dev *rdev)
3771{
3772 if (rdev == NULL)
3773 return;
3774
891636ea
MB		 3775 if (rdev->supply) {
3776 while (rdev->use_count--)
3777 regulator_disable(rdev->supply);
e032b376 3778 regulator_put(rdev->supply);
891636ea 3779 }
414c70cb 3780 mutex_lock(&regulator_list_mutex);
1130e5b3 3781 debugfs_remove_recursive(rdev->debugfs);
43829731 3782 flush_work(&rdev->disable_work.work);
6bf87d17 3783 WARN_ON(rdev->open_count);
0f1d747b 3784 unset_regulator_supplies(rdev);
414c70cb 3785 list_del(&rdev->list);
f8c12fe3 3786 kfree(rdev->constraints);
f19b00da 3787 regulator_ena_gpio_free(rdev);
63c7c9e1 3788 of_node_put(rdev->dev.of_node);
58fb5cf5 3789 device_unregister(&rdev->dev);
414c70cb
LG		 3790 mutex_unlock(&regulator_list_mutex);
3791}
3792EXPORT_SYMBOL_GPL(regulator_unregister);
3793
414c70cb 3794/**
cf7bbcdf 3795 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 3796 * @state: system suspend state
3797 *
3798 * Configure each regulator with it's suspend operating parameters for state.
3799 * This will usually be called by machine suspend code prior to supending.
3800 */
3801int regulator_suspend_prepare(suspend_state_t state)
3802{
3803 struct regulator_dev *rdev;
3804 int ret = 0;
3805
3806 /* ON is handled by regulator active state */
3807 if (state == PM_SUSPEND_ON)
3808 return -EINVAL;
3809
3810 mutex_lock(&regulator_list_mutex);
3811 list_for_each_entry(rdev, &regulator_list, list) {
3812
3813 mutex_lock(&rdev->mutex);
3814 ret = suspend_prepare(rdev, state);
3815 mutex_unlock(&rdev->mutex);
3816
3817 if (ret < 0) {
5da84fd9 3818 rdev_err(rdev, "failed to prepare\n");
414c70cb
LG		 3819 goto out;
3820 }
3821 }
3822out:
3823 mutex_unlock(&regulator_list_mutex);
3824 return ret;
3825}
3826EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3827
7a32b589
MH		 3828/**
3829 * regulator_suspend_finish - resume regulators from system wide suspend
3830 *
3831 * Turn on regulators that might be turned off by regulator_suspend_prepare
3832 * and that should be turned on according to the regulators properties.
3833 */
3834int regulator_suspend_finish(void)
3835{
3836 struct regulator_dev *rdev;
3837 int ret = 0, error;
3838
3839 mutex_lock(&regulator_list_mutex);
3840 list_for_each_entry(rdev, &regulator_list, list) {
7a32b589 3841 mutex_lock(&rdev->mutex);
30c21971 3842 if (rdev->use_count > 0 || rdev->constraints->always_on) {
0548bf4f
JMC		 3843 if (!_regulator_is_enabled(rdev)) {
3844 error = _regulator_do_enable(rdev);
3845 if (error)
3846 ret = error;
3847 }
7a32b589 3848 } else {
87b28417 3849 if (!have_full_constraints())
7a32b589 3850 goto unlock;
b1a86831 3851 if (!_regulator_is_enabled(rdev))
7a32b589
MH		 3852 goto unlock;
3853
66fda75f 3854 error = _regulator_do_disable(rdev);
7a32b589
MH		 3855 if (error)
3856 ret = error;
3857 }
3858unlock:
3859 mutex_unlock(&rdev->mutex);
3860 }
3861 mutex_unlock(&regulator_list_mutex);
3862 return ret;
3863}
3864EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3865
ca725561
MB		 3866/**
3867 * regulator_has_full_constraints - the system has fully specified constraints
3868 *
3869 * Calling this function will cause the regulator API to disable all
3870 * regulators which have a zero use count and don't have an always_on
3871 * constraint in a late_initcall.
3872 *
3873 * The intention is that this will become the default behaviour in a
3874 * future kernel release so users are encouraged to use this facility
3875 * now.
3876 */
3877void regulator_has_full_constraints(void)
3878{
3879 has_full_constraints = 1;
3880}
3881EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3882
414c70cb
LG		 3883/**
3884 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 3885 * @rdev: regulator
414c70cb
LG		 3886 *
3887 * Get rdev regulator driver private data. This call can be used in the
3888 * regulator driver context.
3889 */
3890void *rdev_get_drvdata(struct regulator_dev *rdev)
3891{
3892 return rdev->reg_data;
3893}
3894EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3895
3896/**
3897 * regulator_get_drvdata - get regulator driver data
3898 * @regulator: regulator
3899 *
3900 * Get regulator driver private data. This call can be used in the consumer
3901 * driver context when non API regulator specific functions need to be called.
3902 */
3903void *regulator_get_drvdata(struct regulator *regulator)
3904{
3905 return regulator->rdev->reg_data;
3906}
3907EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3908
3909/**
3910 * regulator_set_drvdata - set regulator driver data
3911 * @regulator: regulator
3912 * @data: data
3913 */
3914void regulator_set_drvdata(struct regulator *regulator, void *data)
3915{
3916 regulator->rdev->reg_data = data;
3917}
3918EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3919
3920/**
3921 * regulator_get_id - get regulator ID
69279fb9 3922 * @rdev: regulator
414c70cb
LG		 3923 */
3924int rdev_get_id(struct regulator_dev *rdev)
3925{
3926 return rdev->desc->id;
3927}
3928EXPORT_SYMBOL_GPL(rdev_get_id);
3929
a5766f11
LG		 3930struct device *rdev_get_dev(struct regulator_dev *rdev)
3931{
3932 return &rdev->dev;
3933}
3934EXPORT_SYMBOL_GPL(rdev_get_dev);
3935
3936void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3937{
3938 return reg_init_data->driver_data;
3939}
3940EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3941
ba55a974
MB		 3942#ifdef CONFIG_DEBUG_FS
3943static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3944 size_t count, loff_t *ppos)
3945{
3946 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3947 ssize_t len, ret = 0;
3948 struct regulator_map *map;
3949
3950 if (!buf)
3951 return -ENOMEM;
3952
3953 list_for_each_entry(map, &regulator_map_list, list) {
3954 len = snprintf(buf + ret, PAGE_SIZE - ret,
3955 "%s -> %s.%s\n",
3956 rdev_get_name(map->regulator), map->dev_name,
3957 map->supply);
3958 if (len >= 0)
3959 ret += len;
3960 if (ret > PAGE_SIZE) {
3961 ret = PAGE_SIZE;
3962 break;
3963 }
3964 }
3965
3966 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3967
3968 kfree(buf);
3969
3970 return ret;
3971}
24751434 3972#endif
ba55a974
MB		 3973
3974static const struct file_operations supply_map_fops = {
24751434 3975#ifdef CONFIG_DEBUG_FS
ba55a974
MB		 3976 .read = supply_map_read_file,
3977 .llseek = default_llseek,
ba55a974 3978#endif
24751434 3979};
ba55a974 3980
7c225ec9
HS		 3981#ifdef CONFIG_DEBUG_FS
3982static void regulator_summary_show_subtree(struct seq_file *s,
3983 struct regulator_dev *rdev,
3984 int level)
3985{
3986 struct list_head *list = s->private;
3987 struct regulator_dev *child;
3988 struct regulation_constraints *c;
3989 struct regulator *consumer;
3990
3991 if (!rdev)
3992 return;
3993
7c225ec9
HS		 3994 seq_printf(s, "%*s%-*s %3d %4d %6d ",
3995 level * 3 + 1, "",
3996 30 - level * 3, rdev_get_name(rdev),
3997 rdev->use_count, rdev->open_count, rdev->bypass_count);
3998
23296099
HS		 3999 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4000 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
7c225ec9
HS		 4001
4002 c = rdev->constraints;
4003 if (c) {
4004 switch (rdev->desc->type) {
4005 case REGULATOR_VOLTAGE:
4006 seq_printf(s, "%5dmV %5dmV ",
4007 c->min_uV / 1000, c->max_uV / 1000);
4008 break;
4009 case REGULATOR_CURRENT:
4010 seq_printf(s, "%5dmA %5dmA ",
4011 c->min_uA / 1000, c->max_uA / 1000);
4012 break;
4013 }
4014 }
4015
4016 seq_puts(s, "\n");
4017
4018 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4019 if (consumer->dev->class == &regulator_class)
4020 continue;
4021
4022 seq_printf(s, "%*s%-*s ",
4023 (level + 1) * 3 + 1, "",
4024 30 - (level + 1) * 3, dev_name(consumer->dev));
4025
4026 switch (rdev->desc->type) {
4027 case REGULATOR_VOLTAGE:
23296099 4028 seq_printf(s, "%37dmV %5dmV",
7c225ec9
HS		 4029 consumer->min_uV / 1000,
4030 consumer->max_uV / 1000);
4031 break;
4032 case REGULATOR_CURRENT:
7c225ec9
HS		 4033 break;
4034 }
4035
4036 seq_puts(s, "\n");
4037 }
4038
7c225ec9
HS		 4039 list_for_each_entry(child, list, list) {
4040 /* handle only non-root regulators supplied by current rdev */
4041 if (!child->supply || child->supply->rdev != rdev)
4042 continue;
4043
4044 regulator_summary_show_subtree(s, child, level + 1);
4045 }
4046}
4047
4048static int regulator_summary_show(struct seq_file *s, void *data)
4049{
4050 struct list_head *list = s->private;
4051 struct regulator_dev *rdev;
4052
23296099
HS		 4053 seq_puts(s, " regulator use open bypass voltage current min max\n");
4054 seq_puts(s, "-------------------------------------------------------------------------------\n");
7c225ec9
HS		 4055
4056 mutex_lock(&regulator_list_mutex);
4057
4058 list_for_each_entry(rdev, list, list) {
4059 if (rdev->supply)
4060 continue;
4061
4062 regulator_summary_show_subtree(s, rdev, 0);
4063 }
4064
4065 mutex_unlock(&regulator_list_mutex);
4066
4067 return 0;
4068}
4069
4070static int regulator_summary_open(struct inode *inode, struct file *file)
4071{
4072 return single_open(file, regulator_summary_show, inode->i_private);
4073}
4074#endif
4075
4076static const struct file_operations regulator_summary_fops = {
4077#ifdef CONFIG_DEBUG_FS
4078 .open = regulator_summary_open,
4079 .read = seq_read,
4080 .llseek = seq_lseek,
4081 .release = single_release,
4082#endif
4083};
4084
414c70cb
LG		 4085static int __init regulator_init(void)
4086{
34abbd68
MB		 4087 int ret;
4088
34abbd68
MB		 4089 ret = class_register(&regulator_class);
4090
1130e5b3 4091 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 4092 if (!debugfs_root)
1130e5b3 4093 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 4094
f4d562c6
MB		 4095 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4096 &supply_map_fops);
1130e5b3 4097
7c225ec9
HS		 4098 debugfs_create_file("regulator_summary", 0444, debugfs_root,
4099 &regulator_list, &regulator_summary_fops);
4100
34abbd68
MB		 4101 regulator_dummy_init();
4102
4103 return ret;
414c70cb
LG		 4104}
4105
4106/* init early to allow our consumers to complete system booting */
4107core_initcall(regulator_init);
ca725561
MB		 4108
4109static int __init regulator_init_complete(void)
4110{
4111 struct regulator_dev *rdev;
272e2315 4112 const struct regulator_ops *ops;
ca725561
MB		 4113 struct regulation_constraints *c;
4114 int enabled, ret;
ca725561 4115
86f5fcfc
MB		 4116 /*
4117 * Since DT doesn't provide an idiomatic mechanism for
4118 * enabling full constraints and since it's much more natural
4119 * with DT to provide them just assume that a DT enabled
4120 * system has full constraints.
4121 */
4122 if (of_have_populated_dt())
4123 has_full_constraints = true;
4124
ca725561
MB		 4125 mutex_lock(&regulator_list_mutex);
4126
4127 /* If we have a full configuration then disable any regulators
e9535834
MB		 4128 * we have permission to change the status for and which are
4129 * not in use or always_on. This is effectively the default
4130 * for DT and ACPI as they have full constraints.
ca725561
MB		 4131 */
4132 list_for_each_entry(rdev, &regulator_list, list) {
4133 ops = rdev->desc->ops;
4134 c = rdev->constraints;
4135
66fda75f 4136 if (c && c->always_on)
ca725561
MB		 4137 continue;
4138
e9535834
MB		 4139 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
4140 continue;
4141
ca725561
MB		 4142 mutex_lock(&rdev->mutex);
4143
4144 if (rdev->use_count)
4145 goto unlock;
4146
4147 /* If we can't read the status assume it's on. */
4148 if (ops->is_enabled)
4149 enabled = ops->is_enabled(rdev);
4150 else
4151 enabled = 1;
4152
4153 if (!enabled)
4154 goto unlock;
4155
87b28417 4156 if (have_full_constraints()) {
ca725561
MB		 4157 /* We log since this may kill the system if it
4158 * goes wrong. */
5da84fd9 4159 rdev_info(rdev, "disabling\n");
66fda75f 4160 ret = _regulator_do_disable(rdev);
0d25d09d 4161 if (ret != 0)
5da84fd9 4162 rdev_err(rdev, "couldn't disable: %d\n", ret);
ca725561
MB		 4163 } else {
4164 /* The intention is that in future we will
4165 * assume that full constraints are provided
4166 * so warn even if we aren't going to do
4167 * anything here.
4168 */
5da84fd9 4169 rdev_warn(rdev, "incomplete constraints, leaving on\n");
ca725561
MB		 4170 }
4171
4172unlock:
4173 mutex_unlock(&rdev->mutex);
4174 }
4175
4176 mutex_unlock(&regulator_list_mutex);
4177
4178 return 0;
4179}
fd482a3e 4180late_initcall_sync(regulator_init_complete);