2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
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.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
27 #include <linux/regmap.h>
28 #include <linux/regulator/of_regulator.h>
29 #include <linux/regulator/consumer.h>
30 #include <linux/regulator/driver.h>
31 #include <linux/regulator/machine.h>
32 #include <linux/module.h>
34 #define CREATE_TRACE_POINTS
35 #include <trace/events/regulator.h>
39 #define rdev_crit(rdev, fmt, ...) \
40 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
41 #define rdev_err(rdev, fmt, ...) \
42 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
43 #define rdev_warn(rdev, fmt, ...) \
44 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
45 #define rdev_info(rdev, fmt, ...) \
46 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
47 #define rdev_dbg(rdev, fmt, ...) \
48 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 static DEFINE_MUTEX(regulator_list_mutex
);
51 static LIST_HEAD(regulator_list
);
52 static LIST_HEAD(regulator_map_list
);
53 static bool has_full_constraints
;
54 static bool board_wants_dummy_regulator
;
56 static struct dentry
*debugfs_root
;
59 * struct regulator_map
61 * Used to provide symbolic supply names to devices.
63 struct regulator_map
{
64 struct list_head list
;
65 const char *dev_name
; /* The dev_name() for the consumer */
67 struct regulator_dev
*regulator
;
73 * One for each consumer device.
77 struct list_head list
;
78 unsigned int always_on
:1;
83 struct device_attribute dev_attr
;
84 struct regulator_dev
*rdev
;
85 struct dentry
*debugfs
;
88 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
89 static int _regulator_disable(struct regulator_dev
*rdev
);
90 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
91 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
92 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
93 static void _notifier_call_chain(struct regulator_dev
*rdev
,
94 unsigned long event
, void *data
);
95 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
96 int min_uV
, int max_uV
);
97 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
99 const char *supply_name
);
101 static const char *rdev_get_name(struct regulator_dev
*rdev
)
103 if (rdev
->constraints
&& rdev
->constraints
->name
)
104 return rdev
->constraints
->name
;
105 else if (rdev
->desc
->name
)
106 return rdev
->desc
->name
;
111 /* gets the regulator for a given consumer device */
112 static struct regulator
*get_device_regulator(struct device
*dev
)
114 struct regulator
*regulator
= NULL
;
115 struct regulator_dev
*rdev
;
117 mutex_lock(®ulator_list_mutex
);
118 list_for_each_entry(rdev
, ®ulator_list
, list
) {
119 mutex_lock(&rdev
->mutex
);
120 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
121 if (regulator
->dev
== dev
) {
122 mutex_unlock(&rdev
->mutex
);
123 mutex_unlock(®ulator_list_mutex
);
127 mutex_unlock(&rdev
->mutex
);
129 mutex_unlock(®ulator_list_mutex
);
134 * of_get_regulator - get a regulator device node based on supply name
135 * @dev: Device pointer for the consumer (of regulator) device
136 * @supply: regulator supply name
138 * Extract the regulator device node corresponding to the supply name.
139 * retruns the device node corresponding to the regulator if found, else
142 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
144 struct device_node
*regnode
= NULL
;
145 char prop_name
[32]; /* 32 is max size of property name */
147 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
149 snprintf(prop_name
, 32, "%s-supply", supply
);
150 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
153 dev_dbg(dev
, "Looking up %s property in node %s failed",
154 prop_name
, dev
->of_node
->full_name
);
160 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
162 if (!rdev
->constraints
)
165 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
171 /* Platform voltage constraint check */
172 static int regulator_check_voltage(struct regulator_dev
*rdev
,
173 int *min_uV
, int *max_uV
)
175 BUG_ON(*min_uV
> *max_uV
);
177 if (!rdev
->constraints
) {
178 rdev_err(rdev
, "no constraints\n");
181 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
182 rdev_err(rdev
, "operation not allowed\n");
186 if (*max_uV
> rdev
->constraints
->max_uV
)
187 *max_uV
= rdev
->constraints
->max_uV
;
188 if (*min_uV
< rdev
->constraints
->min_uV
)
189 *min_uV
= rdev
->constraints
->min_uV
;
191 if (*min_uV
> *max_uV
) {
192 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
200 /* Make sure we select a voltage that suits the needs of all
201 * regulator consumers
203 static int regulator_check_consumers(struct regulator_dev
*rdev
,
204 int *min_uV
, int *max_uV
)
206 struct regulator
*regulator
;
208 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
210 * Assume consumers that didn't say anything are OK
211 * with anything in the constraint range.
213 if (!regulator
->min_uV
&& !regulator
->max_uV
)
216 if (*max_uV
> regulator
->max_uV
)
217 *max_uV
= regulator
->max_uV
;
218 if (*min_uV
< regulator
->min_uV
)
219 *min_uV
= regulator
->min_uV
;
222 if (*min_uV
> *max_uV
)
228 /* current constraint check */
229 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
230 int *min_uA
, int *max_uA
)
232 BUG_ON(*min_uA
> *max_uA
);
234 if (!rdev
->constraints
) {
235 rdev_err(rdev
, "no constraints\n");
238 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
239 rdev_err(rdev
, "operation not allowed\n");
243 if (*max_uA
> rdev
->constraints
->max_uA
)
244 *max_uA
= rdev
->constraints
->max_uA
;
245 if (*min_uA
< rdev
->constraints
->min_uA
)
246 *min_uA
= rdev
->constraints
->min_uA
;
248 if (*min_uA
> *max_uA
) {
249 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
257 /* operating mode constraint check */
258 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
261 case REGULATOR_MODE_FAST
:
262 case REGULATOR_MODE_NORMAL
:
263 case REGULATOR_MODE_IDLE
:
264 case REGULATOR_MODE_STANDBY
:
267 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
271 if (!rdev
->constraints
) {
272 rdev_err(rdev
, "no constraints\n");
275 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
276 rdev_err(rdev
, "operation not allowed\n");
280 /* The modes are bitmasks, the most power hungry modes having
281 * the lowest values. If the requested mode isn't supported
282 * try higher modes. */
284 if (rdev
->constraints
->valid_modes_mask
& *mode
)
292 /* dynamic regulator mode switching constraint check */
293 static int regulator_check_drms(struct regulator_dev
*rdev
)
295 if (!rdev
->constraints
) {
296 rdev_err(rdev
, "no constraints\n");
299 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
300 rdev_err(rdev
, "operation not allowed\n");
306 static ssize_t
device_requested_uA_show(struct device
*dev
,
307 struct device_attribute
*attr
, char *buf
)
309 struct regulator
*regulator
;
311 regulator
= get_device_regulator(dev
);
312 if (regulator
== NULL
)
315 return sprintf(buf
, "%d\n", regulator
->uA_load
);
318 static ssize_t
regulator_uV_show(struct device
*dev
,
319 struct device_attribute
*attr
, char *buf
)
321 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
324 mutex_lock(&rdev
->mutex
);
325 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
326 mutex_unlock(&rdev
->mutex
);
330 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
332 static ssize_t
regulator_uA_show(struct device
*dev
,
333 struct device_attribute
*attr
, char *buf
)
335 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
337 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
339 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
341 static ssize_t
regulator_name_show(struct device
*dev
,
342 struct device_attribute
*attr
, char *buf
)
344 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
346 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
349 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
352 case REGULATOR_MODE_FAST
:
353 return sprintf(buf
, "fast\n");
354 case REGULATOR_MODE_NORMAL
:
355 return sprintf(buf
, "normal\n");
356 case REGULATOR_MODE_IDLE
:
357 return sprintf(buf
, "idle\n");
358 case REGULATOR_MODE_STANDBY
:
359 return sprintf(buf
, "standby\n");
361 return sprintf(buf
, "unknown\n");
364 static ssize_t
regulator_opmode_show(struct device
*dev
,
365 struct device_attribute
*attr
, char *buf
)
367 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
369 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
371 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
373 static ssize_t
regulator_print_state(char *buf
, int state
)
376 return sprintf(buf
, "enabled\n");
378 return sprintf(buf
, "disabled\n");
380 return sprintf(buf
, "unknown\n");
383 static ssize_t
regulator_state_show(struct device
*dev
,
384 struct device_attribute
*attr
, char *buf
)
386 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
389 mutex_lock(&rdev
->mutex
);
390 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
391 mutex_unlock(&rdev
->mutex
);
395 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
397 static ssize_t
regulator_status_show(struct device
*dev
,
398 struct device_attribute
*attr
, char *buf
)
400 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
404 status
= rdev
->desc
->ops
->get_status(rdev
);
409 case REGULATOR_STATUS_OFF
:
412 case REGULATOR_STATUS_ON
:
415 case REGULATOR_STATUS_ERROR
:
418 case REGULATOR_STATUS_FAST
:
421 case REGULATOR_STATUS_NORMAL
:
424 case REGULATOR_STATUS_IDLE
:
427 case REGULATOR_STATUS_STANDBY
:
434 return sprintf(buf
, "%s\n", label
);
436 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
438 static ssize_t
regulator_min_uA_show(struct device
*dev
,
439 struct device_attribute
*attr
, char *buf
)
441 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
443 if (!rdev
->constraints
)
444 return sprintf(buf
, "constraint not defined\n");
446 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
448 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
450 static ssize_t
regulator_max_uA_show(struct device
*dev
,
451 struct device_attribute
*attr
, char *buf
)
453 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
455 if (!rdev
->constraints
)
456 return sprintf(buf
, "constraint not defined\n");
458 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
460 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
462 static ssize_t
regulator_min_uV_show(struct device
*dev
,
463 struct device_attribute
*attr
, char *buf
)
465 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
467 if (!rdev
->constraints
)
468 return sprintf(buf
, "constraint not defined\n");
470 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
472 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
474 static ssize_t
regulator_max_uV_show(struct device
*dev
,
475 struct device_attribute
*attr
, char *buf
)
477 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
479 if (!rdev
->constraints
)
480 return sprintf(buf
, "constraint not defined\n");
482 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
484 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
486 static ssize_t
regulator_total_uA_show(struct device
*dev
,
487 struct device_attribute
*attr
, char *buf
)
489 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
490 struct regulator
*regulator
;
493 mutex_lock(&rdev
->mutex
);
494 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
495 uA
+= regulator
->uA_load
;
496 mutex_unlock(&rdev
->mutex
);
497 return sprintf(buf
, "%d\n", uA
);
499 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
501 static ssize_t
regulator_num_users_show(struct device
*dev
,
502 struct device_attribute
*attr
, char *buf
)
504 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
505 return sprintf(buf
, "%d\n", rdev
->use_count
);
508 static ssize_t
regulator_type_show(struct device
*dev
,
509 struct device_attribute
*attr
, char *buf
)
511 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
513 switch (rdev
->desc
->type
) {
514 case REGULATOR_VOLTAGE
:
515 return sprintf(buf
, "voltage\n");
516 case REGULATOR_CURRENT
:
517 return sprintf(buf
, "current\n");
519 return sprintf(buf
, "unknown\n");
522 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
523 struct device_attribute
*attr
, char *buf
)
525 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
527 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
529 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
530 regulator_suspend_mem_uV_show
, NULL
);
532 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
533 struct device_attribute
*attr
, char *buf
)
535 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
537 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
539 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
540 regulator_suspend_disk_uV_show
, NULL
);
542 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
543 struct device_attribute
*attr
, char *buf
)
545 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
547 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
549 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
550 regulator_suspend_standby_uV_show
, NULL
);
552 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
553 struct device_attribute
*attr
, char *buf
)
555 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
557 return regulator_print_opmode(buf
,
558 rdev
->constraints
->state_mem
.mode
);
560 static DEVICE_ATTR(suspend_mem_mode
, 0444,
561 regulator_suspend_mem_mode_show
, NULL
);
563 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
564 struct device_attribute
*attr
, char *buf
)
566 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
568 return regulator_print_opmode(buf
,
569 rdev
->constraints
->state_disk
.mode
);
571 static DEVICE_ATTR(suspend_disk_mode
, 0444,
572 regulator_suspend_disk_mode_show
, NULL
);
574 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
575 struct device_attribute
*attr
, char *buf
)
577 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
579 return regulator_print_opmode(buf
,
580 rdev
->constraints
->state_standby
.mode
);
582 static DEVICE_ATTR(suspend_standby_mode
, 0444,
583 regulator_suspend_standby_mode_show
, NULL
);
585 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
586 struct device_attribute
*attr
, char *buf
)
588 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
590 return regulator_print_state(buf
,
591 rdev
->constraints
->state_mem
.enabled
);
593 static DEVICE_ATTR(suspend_mem_state
, 0444,
594 regulator_suspend_mem_state_show
, NULL
);
596 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
597 struct device_attribute
*attr
, char *buf
)
599 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
601 return regulator_print_state(buf
,
602 rdev
->constraints
->state_disk
.enabled
);
604 static DEVICE_ATTR(suspend_disk_state
, 0444,
605 regulator_suspend_disk_state_show
, NULL
);
607 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
608 struct device_attribute
*attr
, char *buf
)
610 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
612 return regulator_print_state(buf
,
613 rdev
->constraints
->state_standby
.enabled
);
615 static DEVICE_ATTR(suspend_standby_state
, 0444,
616 regulator_suspend_standby_state_show
, NULL
);
620 * These are the only attributes are present for all regulators.
621 * Other attributes are a function of regulator functionality.
623 static struct device_attribute regulator_dev_attrs
[] = {
624 __ATTR(name
, 0444, regulator_name_show
, NULL
),
625 __ATTR(num_users
, 0444, regulator_num_users_show
, NULL
),
626 __ATTR(type
, 0444, regulator_type_show
, NULL
),
630 static void regulator_dev_release(struct device
*dev
)
632 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
636 static struct class regulator_class
= {
638 .dev_release
= regulator_dev_release
,
639 .dev_attrs
= regulator_dev_attrs
,
642 /* Calculate the new optimum regulator operating mode based on the new total
643 * consumer load. All locks held by caller */
644 static void drms_uA_update(struct regulator_dev
*rdev
)
646 struct regulator
*sibling
;
647 int current_uA
= 0, output_uV
, input_uV
, err
;
650 err
= regulator_check_drms(rdev
);
651 if (err
< 0 || !rdev
->desc
->ops
->get_optimum_mode
||
652 (!rdev
->desc
->ops
->get_voltage
&&
653 !rdev
->desc
->ops
->get_voltage_sel
) ||
654 !rdev
->desc
->ops
->set_mode
)
657 /* get output voltage */
658 output_uV
= _regulator_get_voltage(rdev
);
662 /* get input voltage */
665 input_uV
= regulator_get_voltage(rdev
->supply
);
667 input_uV
= rdev
->constraints
->input_uV
;
671 /* calc total requested load */
672 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
673 current_uA
+= sibling
->uA_load
;
675 /* now get the optimum mode for our new total regulator load */
676 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
677 output_uV
, current_uA
);
679 /* check the new mode is allowed */
680 err
= regulator_mode_constrain(rdev
, &mode
);
682 rdev
->desc
->ops
->set_mode(rdev
, mode
);
685 static int suspend_set_state(struct regulator_dev
*rdev
,
686 struct regulator_state
*rstate
)
690 /* If we have no suspend mode configration don't set anything;
691 * only warn if the driver implements set_suspend_voltage or
692 * set_suspend_mode callback.
694 if (!rstate
->enabled
&& !rstate
->disabled
) {
695 if (rdev
->desc
->ops
->set_suspend_voltage
||
696 rdev
->desc
->ops
->set_suspend_mode
)
697 rdev_warn(rdev
, "No configuration\n");
701 if (rstate
->enabled
&& rstate
->disabled
) {
702 rdev_err(rdev
, "invalid configuration\n");
706 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
707 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
708 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
709 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
710 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
714 rdev_err(rdev
, "failed to enabled/disable\n");
718 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
719 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
721 rdev_err(rdev
, "failed to set voltage\n");
726 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
727 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
729 rdev_err(rdev
, "failed to set mode\n");
736 /* locks held by caller */
737 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
739 if (!rdev
->constraints
)
743 case PM_SUSPEND_STANDBY
:
744 return suspend_set_state(rdev
,
745 &rdev
->constraints
->state_standby
);
747 return suspend_set_state(rdev
,
748 &rdev
->constraints
->state_mem
);
750 return suspend_set_state(rdev
,
751 &rdev
->constraints
->state_disk
);
757 static void print_constraints(struct regulator_dev
*rdev
)
759 struct regulation_constraints
*constraints
= rdev
->constraints
;
764 if (constraints
->min_uV
&& constraints
->max_uV
) {
765 if (constraints
->min_uV
== constraints
->max_uV
)
766 count
+= sprintf(buf
+ count
, "%d mV ",
767 constraints
->min_uV
/ 1000);
769 count
+= sprintf(buf
+ count
, "%d <--> %d mV ",
770 constraints
->min_uV
/ 1000,
771 constraints
->max_uV
/ 1000);
774 if (!constraints
->min_uV
||
775 constraints
->min_uV
!= constraints
->max_uV
) {
776 ret
= _regulator_get_voltage(rdev
);
778 count
+= sprintf(buf
+ count
, "at %d mV ", ret
/ 1000);
781 if (constraints
->uV_offset
)
782 count
+= sprintf(buf
, "%dmV offset ",
783 constraints
->uV_offset
/ 1000);
785 if (constraints
->min_uA
&& constraints
->max_uA
) {
786 if (constraints
->min_uA
== constraints
->max_uA
)
787 count
+= sprintf(buf
+ count
, "%d mA ",
788 constraints
->min_uA
/ 1000);
790 count
+= sprintf(buf
+ count
, "%d <--> %d mA ",
791 constraints
->min_uA
/ 1000,
792 constraints
->max_uA
/ 1000);
795 if (!constraints
->min_uA
||
796 constraints
->min_uA
!= constraints
->max_uA
) {
797 ret
= _regulator_get_current_limit(rdev
);
799 count
+= sprintf(buf
+ count
, "at %d mA ", ret
/ 1000);
802 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
803 count
+= sprintf(buf
+ count
, "fast ");
804 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
805 count
+= sprintf(buf
+ count
, "normal ");
806 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
807 count
+= sprintf(buf
+ count
, "idle ");
808 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
809 count
+= sprintf(buf
+ count
, "standby");
811 rdev_info(rdev
, "%s\n", buf
);
813 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
814 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
816 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
819 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
820 struct regulation_constraints
*constraints
)
822 struct regulator_ops
*ops
= rdev
->desc
->ops
;
825 /* do we need to apply the constraint voltage */
826 if (rdev
->constraints
->apply_uV
&&
827 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
828 ret
= _regulator_do_set_voltage(rdev
,
829 rdev
->constraints
->min_uV
,
830 rdev
->constraints
->max_uV
);
832 rdev_err(rdev
, "failed to apply %duV constraint\n",
833 rdev
->constraints
->min_uV
);
838 /* constrain machine-level voltage specs to fit
839 * the actual range supported by this regulator.
841 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
842 int count
= rdev
->desc
->n_voltages
;
844 int min_uV
= INT_MAX
;
845 int max_uV
= INT_MIN
;
846 int cmin
= constraints
->min_uV
;
847 int cmax
= constraints
->max_uV
;
849 /* it's safe to autoconfigure fixed-voltage supplies
850 and the constraints are used by list_voltage. */
851 if (count
== 1 && !cmin
) {
854 constraints
->min_uV
= cmin
;
855 constraints
->max_uV
= cmax
;
858 /* voltage constraints are optional */
859 if ((cmin
== 0) && (cmax
== 0))
862 /* else require explicit machine-level constraints */
863 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
864 rdev_err(rdev
, "invalid voltage constraints\n");
868 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
869 for (i
= 0; i
< count
; i
++) {
872 value
= ops
->list_voltage(rdev
, i
);
876 /* maybe adjust [min_uV..max_uV] */
877 if (value
>= cmin
&& value
< min_uV
)
879 if (value
<= cmax
&& value
> max_uV
)
883 /* final: [min_uV..max_uV] valid iff constraints valid */
884 if (max_uV
< min_uV
) {
885 rdev_err(rdev
, "unsupportable voltage constraints\n");
889 /* use regulator's subset of machine constraints */
890 if (constraints
->min_uV
< min_uV
) {
891 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
892 constraints
->min_uV
, min_uV
);
893 constraints
->min_uV
= min_uV
;
895 if (constraints
->max_uV
> max_uV
) {
896 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
897 constraints
->max_uV
, max_uV
);
898 constraints
->max_uV
= max_uV
;
906 * set_machine_constraints - sets regulator constraints
907 * @rdev: regulator source
908 * @constraints: constraints to apply
910 * Allows platform initialisation code to define and constrain
911 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
912 * Constraints *must* be set by platform code in order for some
913 * regulator operations to proceed i.e. set_voltage, set_current_limit,
916 static int set_machine_constraints(struct regulator_dev
*rdev
,
917 const struct regulation_constraints
*constraints
)
920 struct regulator_ops
*ops
= rdev
->desc
->ops
;
923 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
926 rdev
->constraints
= kzalloc(sizeof(*constraints
),
928 if (!rdev
->constraints
)
931 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
935 /* do we need to setup our suspend state */
936 if (rdev
->constraints
->initial_state
) {
937 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
939 rdev_err(rdev
, "failed to set suspend state\n");
944 if (rdev
->constraints
->initial_mode
) {
945 if (!ops
->set_mode
) {
946 rdev_err(rdev
, "no set_mode operation\n");
951 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
953 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
958 /* If the constraints say the regulator should be on at this point
959 * and we have control then make sure it is enabled.
961 if ((rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) &&
963 ret
= ops
->enable(rdev
);
965 rdev_err(rdev
, "failed to enable\n");
970 print_constraints(rdev
);
973 kfree(rdev
->constraints
);
974 rdev
->constraints
= NULL
;
979 * set_supply - set regulator supply regulator
980 * @rdev: regulator name
981 * @supply_rdev: supply regulator name
983 * Called by platform initialisation code to set the supply regulator for this
984 * regulator. This ensures that a regulators supply will also be enabled by the
985 * core if it's child is enabled.
987 static int set_supply(struct regulator_dev
*rdev
,
988 struct regulator_dev
*supply_rdev
)
992 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
994 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
995 if (rdev
->supply
== NULL
) {
1004 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1005 * @rdev: regulator source
1006 * @consumer_dev_name: dev_name() string for device supply applies to
1007 * @supply: symbolic name for supply
1009 * Allows platform initialisation code to map physical regulator
1010 * sources to symbolic names for supplies for use by devices. Devices
1011 * should use these symbolic names to request regulators, avoiding the
1012 * need to provide board-specific regulator names as platform data.
1014 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1015 const char *consumer_dev_name
,
1018 struct regulator_map
*node
;
1024 if (consumer_dev_name
!= NULL
)
1029 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1030 if (node
->dev_name
&& consumer_dev_name
) {
1031 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1033 } else if (node
->dev_name
|| consumer_dev_name
) {
1037 if (strcmp(node
->supply
, supply
) != 0)
1040 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1042 dev_name(&node
->regulator
->dev
),
1043 node
->regulator
->desc
->name
,
1045 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1049 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1053 node
->regulator
= rdev
;
1054 node
->supply
= supply
;
1057 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1058 if (node
->dev_name
== NULL
) {
1064 list_add(&node
->list
, ®ulator_map_list
);
1068 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1070 struct regulator_map
*node
, *n
;
1072 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1073 if (rdev
== node
->regulator
) {
1074 list_del(&node
->list
);
1075 kfree(node
->dev_name
);
1081 #define REG_STR_SIZE 64
1083 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1085 const char *supply_name
)
1087 struct regulator
*regulator
;
1088 char buf
[REG_STR_SIZE
];
1091 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1092 if (regulator
== NULL
)
1095 mutex_lock(&rdev
->mutex
);
1096 regulator
->rdev
= rdev
;
1097 list_add(®ulator
->list
, &rdev
->consumer_list
);
1100 /* create a 'requested_microamps_name' sysfs entry */
1101 size
= scnprintf(buf
, REG_STR_SIZE
,
1102 "microamps_requested_%s-%s",
1103 dev_name(dev
), supply_name
);
1104 if (size
>= REG_STR_SIZE
)
1107 regulator
->dev
= dev
;
1108 sysfs_attr_init(®ulator
->dev_attr
.attr
);
1109 regulator
->dev_attr
.attr
.name
= kstrdup(buf
, GFP_KERNEL
);
1110 if (regulator
->dev_attr
.attr
.name
== NULL
)
1113 regulator
->dev_attr
.attr
.mode
= 0444;
1114 regulator
->dev_attr
.show
= device_requested_uA_show
;
1115 err
= device_create_file(dev
, ®ulator
->dev_attr
);
1117 rdev_warn(rdev
, "could not add regulator_dev requested microamps sysfs entry\n");
1121 /* also add a link to the device sysfs entry */
1122 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1123 dev
->kobj
.name
, supply_name
);
1124 if (size
>= REG_STR_SIZE
)
1127 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1128 if (regulator
->supply_name
== NULL
)
1131 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1134 rdev_warn(rdev
, "could not add device link %s err %d\n",
1135 dev
->kobj
.name
, err
);
1139 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1140 if (regulator
->supply_name
== NULL
)
1144 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1146 if (!regulator
->debugfs
) {
1147 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1149 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1150 ®ulator
->uA_load
);
1151 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1152 ®ulator
->min_uV
);
1153 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1154 ®ulator
->max_uV
);
1158 * Check now if the regulator is an always on regulator - if
1159 * it is then we don't need to do nearly so much work for
1160 * enable/disable calls.
1162 if (!_regulator_can_change_status(rdev
) &&
1163 _regulator_is_enabled(rdev
))
1164 regulator
->always_on
= true;
1166 mutex_unlock(&rdev
->mutex
);
1169 kfree(regulator
->supply_name
);
1171 device_remove_file(regulator
->dev
, ®ulator
->dev_attr
);
1173 kfree(regulator
->dev_attr
.attr
.name
);
1175 list_del(®ulator
->list
);
1177 mutex_unlock(&rdev
->mutex
);
1181 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1183 if (!rdev
->desc
->ops
->enable_time
)
1185 return rdev
->desc
->ops
->enable_time(rdev
);
1188 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1192 struct regulator_dev
*r
;
1193 struct device_node
*node
;
1194 struct regulator_map
*map
;
1195 const char *devname
= NULL
;
1197 /* first do a dt based lookup */
1198 if (dev
&& dev
->of_node
) {
1199 node
= of_get_regulator(dev
, supply
);
1201 list_for_each_entry(r
, ®ulator_list
, list
)
1202 if (r
->dev
.parent
&&
1203 node
== r
->dev
.of_node
)
1207 * If we couldn't even get the node then it's
1208 * not just that the device didn't register
1209 * yet, there's no node and we'll never
1216 /* if not found, try doing it non-dt way */
1218 devname
= dev_name(dev
);
1220 list_for_each_entry(r
, ®ulator_list
, list
)
1221 if (strcmp(rdev_get_name(r
), supply
) == 0)
1224 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1225 /* If the mapping has a device set up it must match */
1226 if (map
->dev_name
&&
1227 (!devname
|| strcmp(map
->dev_name
, devname
)))
1230 if (strcmp(map
->supply
, supply
) == 0)
1231 return map
->regulator
;
1238 /* Internal regulator request function */
1239 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1242 struct regulator_dev
*rdev
;
1243 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1244 const char *devname
= NULL
;
1248 pr_err("get() with no identifier\n");
1253 devname
= dev_name(dev
);
1255 mutex_lock(®ulator_list_mutex
);
1257 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1261 if (board_wants_dummy_regulator
) {
1262 rdev
= dummy_regulator_rdev
;
1266 #ifdef CONFIG_REGULATOR_DUMMY
1268 devname
= "deviceless";
1270 /* If the board didn't flag that it was fully constrained then
1271 * substitute in a dummy regulator so consumers can continue.
1273 if (!has_full_constraints
) {
1274 pr_warn("%s supply %s not found, using dummy regulator\n",
1276 rdev
= dummy_regulator_rdev
;
1281 mutex_unlock(®ulator_list_mutex
);
1285 if (rdev
->exclusive
) {
1286 regulator
= ERR_PTR(-EPERM
);
1290 if (exclusive
&& rdev
->open_count
) {
1291 regulator
= ERR_PTR(-EBUSY
);
1295 if (!try_module_get(rdev
->owner
))
1298 regulator
= create_regulator(rdev
, dev
, id
);
1299 if (regulator
== NULL
) {
1300 regulator
= ERR_PTR(-ENOMEM
);
1301 module_put(rdev
->owner
);
1307 rdev
->exclusive
= 1;
1309 ret
= _regulator_is_enabled(rdev
);
1311 rdev
->use_count
= 1;
1313 rdev
->use_count
= 0;
1317 mutex_unlock(®ulator_list_mutex
);
1323 * regulator_get - lookup and obtain a reference to a regulator.
1324 * @dev: device for regulator "consumer"
1325 * @id: Supply name or regulator ID.
1327 * Returns a struct regulator corresponding to the regulator producer,
1328 * or IS_ERR() condition containing errno.
1330 * Use of supply names configured via regulator_set_device_supply() is
1331 * strongly encouraged. It is recommended that the supply name used
1332 * should match the name used for the supply and/or the relevant
1333 * device pins in the datasheet.
1335 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1337 return _regulator_get(dev
, id
, 0);
1339 EXPORT_SYMBOL_GPL(regulator_get
);
1341 static void devm_regulator_release(struct device
*dev
, void *res
)
1343 regulator_put(*(struct regulator
**)res
);
1347 * devm_regulator_get - Resource managed regulator_get()
1348 * @dev: device for regulator "consumer"
1349 * @id: Supply name or regulator ID.
1351 * Managed regulator_get(). Regulators returned from this function are
1352 * automatically regulator_put() on driver detach. See regulator_get() for more
1355 struct regulator
*devm_regulator_get(struct device
*dev
, const char *id
)
1357 struct regulator
**ptr
, *regulator
;
1359 ptr
= devres_alloc(devm_regulator_release
, sizeof(*ptr
), GFP_KERNEL
);
1361 return ERR_PTR(-ENOMEM
);
1363 regulator
= regulator_get(dev
, id
);
1364 if (!IS_ERR(regulator
)) {
1366 devres_add(dev
, ptr
);
1373 EXPORT_SYMBOL_GPL(devm_regulator_get
);
1376 * regulator_get_exclusive - obtain exclusive access to a regulator.
1377 * @dev: device for regulator "consumer"
1378 * @id: Supply name or regulator ID.
1380 * Returns a struct regulator corresponding to the regulator producer,
1381 * or IS_ERR() condition containing errno. Other consumers will be
1382 * unable to obtain this reference is held and the use count for the
1383 * regulator will be initialised to reflect the current state of the
1386 * This is intended for use by consumers which cannot tolerate shared
1387 * use of the regulator such as those which need to force the
1388 * regulator off for correct operation of the hardware they are
1391 * Use of supply names configured via regulator_set_device_supply() is
1392 * strongly encouraged. It is recommended that the supply name used
1393 * should match the name used for the supply and/or the relevant
1394 * device pins in the datasheet.
1396 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1398 return _regulator_get(dev
, id
, 1);
1400 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1403 * regulator_put - "free" the regulator source
1404 * @regulator: regulator source
1406 * Note: drivers must ensure that all regulator_enable calls made on this
1407 * regulator source are balanced by regulator_disable calls prior to calling
1410 void regulator_put(struct regulator
*regulator
)
1412 struct regulator_dev
*rdev
;
1414 if (regulator
== NULL
|| IS_ERR(regulator
))
1417 mutex_lock(®ulator_list_mutex
);
1418 rdev
= regulator
->rdev
;
1420 debugfs_remove_recursive(regulator
->debugfs
);
1422 /* remove any sysfs entries */
1423 if (regulator
->dev
) {
1424 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1425 device_remove_file(regulator
->dev
, ®ulator
->dev_attr
);
1426 kfree(regulator
->dev_attr
.attr
.name
);
1428 kfree(regulator
->supply_name
);
1429 list_del(®ulator
->list
);
1433 rdev
->exclusive
= 0;
1435 module_put(rdev
->owner
);
1436 mutex_unlock(®ulator_list_mutex
);
1438 EXPORT_SYMBOL_GPL(regulator_put
);
1440 static int devm_regulator_match(struct device
*dev
, void *res
, void *data
)
1442 struct regulator
**r
= res
;
1451 * devm_regulator_put - Resource managed regulator_put()
1452 * @regulator: regulator to free
1454 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1455 * this function will not need to be called and the resource management
1456 * code will ensure that the resource is freed.
1458 void devm_regulator_put(struct regulator
*regulator
)
1462 rc
= devres_destroy(regulator
->dev
, devm_regulator_release
,
1463 devm_regulator_match
, regulator
);
1465 regulator_put(regulator
);
1469 EXPORT_SYMBOL_GPL(devm_regulator_put
);
1471 /* locks held by regulator_enable() */
1472 static int _regulator_enable(struct regulator_dev
*rdev
)
1476 /* check voltage and requested load before enabling */
1477 if (rdev
->constraints
&&
1478 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1479 drms_uA_update(rdev
);
1481 if (rdev
->use_count
== 0) {
1482 /* The regulator may on if it's not switchable or left on */
1483 ret
= _regulator_is_enabled(rdev
);
1484 if (ret
== -EINVAL
|| ret
== 0) {
1485 if (!_regulator_can_change_status(rdev
))
1488 if (!rdev
->desc
->ops
->enable
)
1491 /* Query before enabling in case configuration
1493 ret
= _regulator_get_enable_time(rdev
);
1497 rdev_warn(rdev
, "enable_time() failed: %d\n",
1502 trace_regulator_enable(rdev_get_name(rdev
));
1504 /* Allow the regulator to ramp; it would be useful
1505 * to extend this for bulk operations so that the
1506 * regulators can ramp together. */
1507 ret
= rdev
->desc
->ops
->enable(rdev
);
1511 trace_regulator_enable_delay(rdev_get_name(rdev
));
1513 if (delay
>= 1000) {
1514 mdelay(delay
/ 1000);
1515 udelay(delay
% 1000);
1520 trace_regulator_enable_complete(rdev_get_name(rdev
));
1522 } else if (ret
< 0) {
1523 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1526 /* Fallthrough on positive return values - already enabled */
1535 * regulator_enable - enable regulator output
1536 * @regulator: regulator source
1538 * Request that the regulator be enabled with the regulator output at
1539 * the predefined voltage or current value. Calls to regulator_enable()
1540 * must be balanced with calls to regulator_disable().
1542 * NOTE: the output value can be set by other drivers, boot loader or may be
1543 * hardwired in the regulator.
1545 int regulator_enable(struct regulator
*regulator
)
1547 struct regulator_dev
*rdev
= regulator
->rdev
;
1550 if (regulator
->always_on
)
1554 ret
= regulator_enable(rdev
->supply
);
1559 mutex_lock(&rdev
->mutex
);
1560 ret
= _regulator_enable(rdev
);
1561 mutex_unlock(&rdev
->mutex
);
1563 if (ret
!= 0 && rdev
->supply
)
1564 regulator_disable(rdev
->supply
);
1568 EXPORT_SYMBOL_GPL(regulator_enable
);
1570 /* locks held by regulator_disable() */
1571 static int _regulator_disable(struct regulator_dev
*rdev
)
1575 if (WARN(rdev
->use_count
<= 0,
1576 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1579 /* are we the last user and permitted to disable ? */
1580 if (rdev
->use_count
== 1 &&
1581 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1583 /* we are last user */
1584 if (_regulator_can_change_status(rdev
) &&
1585 rdev
->desc
->ops
->disable
) {
1586 trace_regulator_disable(rdev_get_name(rdev
));
1588 ret
= rdev
->desc
->ops
->disable(rdev
);
1590 rdev_err(rdev
, "failed to disable\n");
1594 trace_regulator_disable_complete(rdev_get_name(rdev
));
1596 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1600 rdev
->use_count
= 0;
1601 } else if (rdev
->use_count
> 1) {
1603 if (rdev
->constraints
&&
1604 (rdev
->constraints
->valid_ops_mask
&
1605 REGULATOR_CHANGE_DRMS
))
1606 drms_uA_update(rdev
);
1615 * regulator_disable - disable regulator output
1616 * @regulator: regulator source
1618 * Disable the regulator output voltage or current. Calls to
1619 * regulator_enable() must be balanced with calls to
1620 * regulator_disable().
1622 * NOTE: this will only disable the regulator output if no other consumer
1623 * devices have it enabled, the regulator device supports disabling and
1624 * machine constraints permit this operation.
1626 int regulator_disable(struct regulator
*regulator
)
1628 struct regulator_dev
*rdev
= regulator
->rdev
;
1631 if (regulator
->always_on
)
1634 mutex_lock(&rdev
->mutex
);
1635 ret
= _regulator_disable(rdev
);
1636 mutex_unlock(&rdev
->mutex
);
1638 if (ret
== 0 && rdev
->supply
)
1639 regulator_disable(rdev
->supply
);
1643 EXPORT_SYMBOL_GPL(regulator_disable
);
1645 /* locks held by regulator_force_disable() */
1646 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1651 if (rdev
->desc
->ops
->disable
) {
1652 /* ah well, who wants to live forever... */
1653 ret
= rdev
->desc
->ops
->disable(rdev
);
1655 rdev_err(rdev
, "failed to force disable\n");
1658 /* notify other consumers that power has been forced off */
1659 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1660 REGULATOR_EVENT_DISABLE
, NULL
);
1667 * regulator_force_disable - force disable regulator output
1668 * @regulator: regulator source
1670 * Forcibly disable the regulator output voltage or current.
1671 * NOTE: this *will* disable the regulator output even if other consumer
1672 * devices have it enabled. This should be used for situations when device
1673 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1675 int regulator_force_disable(struct regulator
*regulator
)
1677 struct regulator_dev
*rdev
= regulator
->rdev
;
1680 mutex_lock(&rdev
->mutex
);
1681 regulator
->uA_load
= 0;
1682 ret
= _regulator_force_disable(regulator
->rdev
);
1683 mutex_unlock(&rdev
->mutex
);
1686 while (rdev
->open_count
--)
1687 regulator_disable(rdev
->supply
);
1691 EXPORT_SYMBOL_GPL(regulator_force_disable
);
1693 static void regulator_disable_work(struct work_struct
*work
)
1695 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
1699 mutex_lock(&rdev
->mutex
);
1701 BUG_ON(!rdev
->deferred_disables
);
1703 count
= rdev
->deferred_disables
;
1704 rdev
->deferred_disables
= 0;
1706 for (i
= 0; i
< count
; i
++) {
1707 ret
= _regulator_disable(rdev
);
1709 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
1712 mutex_unlock(&rdev
->mutex
);
1715 for (i
= 0; i
< count
; i
++) {
1716 ret
= regulator_disable(rdev
->supply
);
1719 "Supply disable failed: %d\n", ret
);
1726 * regulator_disable_deferred - disable regulator output with delay
1727 * @regulator: regulator source
1728 * @ms: miliseconds until the regulator is disabled
1730 * Execute regulator_disable() on the regulator after a delay. This
1731 * is intended for use with devices that require some time to quiesce.
1733 * NOTE: this will only disable the regulator output if no other consumer
1734 * devices have it enabled, the regulator device supports disabling and
1735 * machine constraints permit this operation.
1737 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
1739 struct regulator_dev
*rdev
= regulator
->rdev
;
1742 if (regulator
->always_on
)
1745 mutex_lock(&rdev
->mutex
);
1746 rdev
->deferred_disables
++;
1747 mutex_unlock(&rdev
->mutex
);
1749 ret
= schedule_delayed_work(&rdev
->disable_work
,
1750 msecs_to_jiffies(ms
));
1756 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
1759 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1761 * @rdev: regulator to operate on
1763 * Regulators that use regmap for their register I/O can set the
1764 * enable_reg and enable_mask fields in their descriptor and then use
1765 * this as their is_enabled operation, saving some code.
1767 int regulator_is_enabled_regmap(struct regulator_dev
*rdev
)
1772 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->enable_reg
, &val
);
1776 return (val
& rdev
->desc
->enable_mask
) != 0;
1778 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap
);
1781 * regulator_enable_regmap - standard enable() for regmap users
1783 * @rdev: regulator to operate on
1785 * Regulators that use regmap for their register I/O can set the
1786 * enable_reg and enable_mask fields in their descriptor and then use
1787 * this as their enable() operation, saving some code.
1789 int regulator_enable_regmap(struct regulator_dev
*rdev
)
1791 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1792 rdev
->desc
->enable_mask
,
1793 rdev
->desc
->enable_mask
);
1795 EXPORT_SYMBOL_GPL(regulator_enable_regmap
);
1798 * regulator_disable_regmap - standard disable() for regmap users
1800 * @rdev: regulator to operate on
1802 * Regulators that use regmap for their register I/O can set the
1803 * enable_reg and enable_mask fields in their descriptor and then use
1804 * this as their disable() operation, saving some code.
1806 int regulator_disable_regmap(struct regulator_dev
*rdev
)
1808 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1809 rdev
->desc
->enable_mask
, 0);
1811 EXPORT_SYMBOL_GPL(regulator_disable_regmap
);
1813 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
1815 /* If we don't know then assume that the regulator is always on */
1816 if (!rdev
->desc
->ops
->is_enabled
)
1819 return rdev
->desc
->ops
->is_enabled(rdev
);
1823 * regulator_is_enabled - is the regulator output enabled
1824 * @regulator: regulator source
1826 * Returns positive if the regulator driver backing the source/client
1827 * has requested that the device be enabled, zero if it hasn't, else a
1828 * negative errno code.
1830 * Note that the device backing this regulator handle can have multiple
1831 * users, so it might be enabled even if regulator_enable() was never
1832 * called for this particular source.
1834 int regulator_is_enabled(struct regulator
*regulator
)
1838 if (regulator
->always_on
)
1841 mutex_lock(®ulator
->rdev
->mutex
);
1842 ret
= _regulator_is_enabled(regulator
->rdev
);
1843 mutex_unlock(®ulator
->rdev
->mutex
);
1847 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
1850 * regulator_count_voltages - count regulator_list_voltage() selectors
1851 * @regulator: regulator source
1853 * Returns number of selectors, or negative errno. Selectors are
1854 * numbered starting at zero, and typically correspond to bitfields
1855 * in hardware registers.
1857 int regulator_count_voltages(struct regulator
*regulator
)
1859 struct regulator_dev
*rdev
= regulator
->rdev
;
1861 return rdev
->desc
->n_voltages
? : -EINVAL
;
1863 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
1866 * regulator_list_voltage_linear - List voltages with simple calculation
1868 * @rdev: Regulator device
1869 * @selector: Selector to convert into a voltage
1871 * Regulators with a simple linear mapping between voltages and
1872 * selectors can set min_uV and uV_step in the regulator descriptor
1873 * and then use this function as their list_voltage() operation,
1875 int regulator_list_voltage_linear(struct regulator_dev
*rdev
,
1876 unsigned int selector
)
1878 if (selector
>= rdev
->desc
->n_voltages
)
1881 return rdev
->desc
->min_uV
+ (rdev
->desc
->uV_step
* selector
);
1883 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear
);
1886 * regulator_list_voltage - enumerate supported voltages
1887 * @regulator: regulator source
1888 * @selector: identify voltage to list
1889 * Context: can sleep
1891 * Returns a voltage that can be passed to @regulator_set_voltage(),
1892 * zero if this selector code can't be used on this system, or a
1895 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
1897 struct regulator_dev
*rdev
= regulator
->rdev
;
1898 struct regulator_ops
*ops
= rdev
->desc
->ops
;
1901 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
1904 mutex_lock(&rdev
->mutex
);
1905 ret
= ops
->list_voltage(rdev
, selector
);
1906 mutex_unlock(&rdev
->mutex
);
1909 if (ret
< rdev
->constraints
->min_uV
)
1911 else if (ret
> rdev
->constraints
->max_uV
)
1917 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
1920 * regulator_is_supported_voltage - check if a voltage range can be supported
1922 * @regulator: Regulator to check.
1923 * @min_uV: Minimum required voltage in uV.
1924 * @max_uV: Maximum required voltage in uV.
1926 * Returns a boolean or a negative error code.
1928 int regulator_is_supported_voltage(struct regulator
*regulator
,
1929 int min_uV
, int max_uV
)
1931 int i
, voltages
, ret
;
1933 ret
= regulator_count_voltages(regulator
);
1938 for (i
= 0; i
< voltages
; i
++) {
1939 ret
= regulator_list_voltage(regulator
, i
);
1941 if (ret
>= min_uV
&& ret
<= max_uV
)
1947 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
1950 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
1952 * @rdev: regulator to operate on
1954 * Regulators that use regmap for their register I/O can set the
1955 * vsel_reg and vsel_mask fields in their descriptor and then use this
1956 * as their get_voltage_vsel operation, saving some code.
1958 int regulator_get_voltage_sel_regmap(struct regulator_dev
*rdev
)
1963 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->vsel_reg
, &val
);
1967 val
&= rdev
->desc
->vsel_mask
;
1968 val
>>= ffs(rdev
->desc
->vsel_mask
) - 1;
1972 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap
);
1975 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
1977 * @rdev: regulator to operate on
1978 * @sel: Selector to set
1980 * Regulators that use regmap for their register I/O can set the
1981 * vsel_reg and vsel_mask fields in their descriptor and then use this
1982 * as their set_voltage_vsel operation, saving some code.
1984 int regulator_set_voltage_sel_regmap(struct regulator_dev
*rdev
, unsigned sel
)
1986 sel
<<= ffs(rdev
->desc
->vsel_mask
) - 1;
1988 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->vsel_reg
,
1989 rdev
->desc
->vsel_mask
, sel
);
1991 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap
);
1994 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
1996 * @rdev: Regulator to operate on
1997 * @min_uV: Lower bound for voltage
1998 * @max_uV: Upper bound for voltage
2000 * Drivers implementing set_voltage_sel() and list_voltage() can use
2001 * this as their map_voltage() operation. It will find a suitable
2002 * voltage by calling list_voltage() until it gets something in bounds
2003 * for the requested voltages.
2005 int regulator_map_voltage_iterate(struct regulator_dev
*rdev
,
2006 int min_uV
, int max_uV
)
2008 int best_val
= INT_MAX
;
2012 /* Find the smallest voltage that falls within the specified
2015 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2016 ret
= rdev
->desc
->ops
->list_voltage(rdev
, i
);
2020 if (ret
< best_val
&& ret
>= min_uV
&& ret
<= max_uV
) {
2026 if (best_val
!= INT_MAX
)
2031 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate
);
2034 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2036 * @rdev: Regulator to operate on
2037 * @min_uV: Lower bound for voltage
2038 * @max_uV: Upper bound for voltage
2040 * Drivers providing min_uV and uV_step in their regulator_desc can
2041 * use this as their map_voltage() operation.
2043 int regulator_map_voltage_linear(struct regulator_dev
*rdev
,
2044 int min_uV
, int max_uV
)
2048 if (!rdev
->desc
->uV_step
) {
2049 BUG_ON(!rdev
->desc
->uV_step
);
2053 if (min_uV
< rdev
->desc
->min_uV
)
2054 min_uV
= rdev
->desc
->min_uV
;
2056 ret
= DIV_ROUND_UP(min_uV
- rdev
->desc
->min_uV
, rdev
->desc
->uV_step
);
2060 /* Map back into a voltage to verify we're still in bounds */
2061 voltage
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2062 if (voltage
< min_uV
|| voltage
> max_uV
)
2067 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear
);
2069 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2070 int min_uV
, int max_uV
)
2075 unsigned int selector
;
2076 int old_selector
= -1;
2078 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2080 min_uV
+= rdev
->constraints
->uV_offset
;
2081 max_uV
+= rdev
->constraints
->uV_offset
;
2084 * If we can't obtain the old selector there is not enough
2085 * info to call set_voltage_time_sel().
2087 if (rdev
->desc
->ops
->set_voltage_time_sel
&&
2088 rdev
->desc
->ops
->get_voltage_sel
) {
2089 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2090 if (old_selector
< 0)
2091 return old_selector
;
2094 if (rdev
->desc
->ops
->set_voltage
) {
2095 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
,
2097 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2098 if (rdev
->desc
->ops
->map_voltage
)
2099 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2102 ret
= regulator_map_voltage_iterate(rdev
, min_uV
,
2107 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, ret
);
2113 if (rdev
->desc
->ops
->list_voltage
)
2114 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, selector
);
2118 /* Call set_voltage_time_sel if successfully obtained old_selector */
2119 if (ret
== 0 && old_selector
>= 0 &&
2120 rdev
->desc
->ops
->set_voltage_time_sel
) {
2122 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2123 old_selector
, selector
);
2125 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2131 /* Insert any necessary delays */
2132 if (delay
>= 1000) {
2133 mdelay(delay
/ 1000);
2134 udelay(delay
% 1000);
2140 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2143 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2149 * regulator_set_voltage - set regulator output voltage
2150 * @regulator: regulator source
2151 * @min_uV: Minimum required voltage in uV
2152 * @max_uV: Maximum acceptable voltage in uV
2154 * Sets a voltage regulator to the desired output voltage. This can be set
2155 * during any regulator state. IOW, regulator can be disabled or enabled.
2157 * If the regulator is enabled then the voltage will change to the new value
2158 * immediately otherwise if the regulator is disabled the regulator will
2159 * output at the new voltage when enabled.
2161 * NOTE: If the regulator is shared between several devices then the lowest
2162 * request voltage that meets the system constraints will be used.
2163 * Regulator system constraints must be set for this regulator before
2164 * calling this function otherwise this call will fail.
2166 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2168 struct regulator_dev
*rdev
= regulator
->rdev
;
2171 mutex_lock(&rdev
->mutex
);
2173 /* If we're setting the same range as last time the change
2174 * should be a noop (some cpufreq implementations use the same
2175 * voltage for multiple frequencies, for example).
2177 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2181 if (!rdev
->desc
->ops
->set_voltage
&&
2182 !rdev
->desc
->ops
->set_voltage_sel
) {
2187 /* constraints check */
2188 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2191 regulator
->min_uV
= min_uV
;
2192 regulator
->max_uV
= max_uV
;
2194 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2198 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2201 mutex_unlock(&rdev
->mutex
);
2204 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2207 * regulator_set_voltage_time - get raise/fall time
2208 * @regulator: regulator source
2209 * @old_uV: starting voltage in microvolts
2210 * @new_uV: target voltage in microvolts
2212 * Provided with the starting and ending voltage, this function attempts to
2213 * calculate the time in microseconds required to rise or fall to this new
2216 int regulator_set_voltage_time(struct regulator
*regulator
,
2217 int old_uV
, int new_uV
)
2219 struct regulator_dev
*rdev
= regulator
->rdev
;
2220 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2226 /* Currently requires operations to do this */
2227 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2228 || !rdev
->desc
->n_voltages
)
2231 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2232 /* We only look for exact voltage matches here */
2233 voltage
= regulator_list_voltage(regulator
, i
);
2238 if (voltage
== old_uV
)
2240 if (voltage
== new_uV
)
2244 if (old_sel
< 0 || new_sel
< 0)
2247 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2249 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2252 * regulator_sync_voltage - re-apply last regulator output voltage
2253 * @regulator: regulator source
2255 * Re-apply the last configured voltage. This is intended to be used
2256 * where some external control source the consumer is cooperating with
2257 * has caused the configured voltage to change.
2259 int regulator_sync_voltage(struct regulator
*regulator
)
2261 struct regulator_dev
*rdev
= regulator
->rdev
;
2262 int ret
, min_uV
, max_uV
;
2264 mutex_lock(&rdev
->mutex
);
2266 if (!rdev
->desc
->ops
->set_voltage
&&
2267 !rdev
->desc
->ops
->set_voltage_sel
) {
2272 /* This is only going to work if we've had a voltage configured. */
2273 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2278 min_uV
= regulator
->min_uV
;
2279 max_uV
= regulator
->max_uV
;
2281 /* This should be a paranoia check... */
2282 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2286 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2290 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2293 mutex_unlock(&rdev
->mutex
);
2296 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2298 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2302 if (rdev
->desc
->ops
->get_voltage_sel
) {
2303 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2306 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2307 } else if (rdev
->desc
->ops
->get_voltage
) {
2308 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2315 return ret
- rdev
->constraints
->uV_offset
;
2319 * regulator_get_voltage - get regulator output voltage
2320 * @regulator: regulator source
2322 * This returns the current regulator voltage in uV.
2324 * NOTE: If the regulator is disabled it will return the voltage value. This
2325 * function should not be used to determine regulator state.
2327 int regulator_get_voltage(struct regulator
*regulator
)
2331 mutex_lock(®ulator
->rdev
->mutex
);
2333 ret
= _regulator_get_voltage(regulator
->rdev
);
2335 mutex_unlock(®ulator
->rdev
->mutex
);
2339 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2342 * regulator_set_current_limit - set regulator output current limit
2343 * @regulator: regulator source
2344 * @min_uA: Minimuum supported current in uA
2345 * @max_uA: Maximum supported current in uA
2347 * Sets current sink to the desired output current. This can be set during
2348 * any regulator state. IOW, regulator can be disabled or enabled.
2350 * If the regulator is enabled then the current will change to the new value
2351 * immediately otherwise if the regulator is disabled the regulator will
2352 * output at the new current when enabled.
2354 * NOTE: Regulator system constraints must be set for this regulator before
2355 * calling this function otherwise this call will fail.
2357 int regulator_set_current_limit(struct regulator
*regulator
,
2358 int min_uA
, int max_uA
)
2360 struct regulator_dev
*rdev
= regulator
->rdev
;
2363 mutex_lock(&rdev
->mutex
);
2366 if (!rdev
->desc
->ops
->set_current_limit
) {
2371 /* constraints check */
2372 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2376 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2378 mutex_unlock(&rdev
->mutex
);
2381 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2383 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2387 mutex_lock(&rdev
->mutex
);
2390 if (!rdev
->desc
->ops
->get_current_limit
) {
2395 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2397 mutex_unlock(&rdev
->mutex
);
2402 * regulator_get_current_limit - get regulator output current
2403 * @regulator: regulator source
2405 * This returns the current supplied by the specified current sink in uA.
2407 * NOTE: If the regulator is disabled it will return the current value. This
2408 * function should not be used to determine regulator state.
2410 int regulator_get_current_limit(struct regulator
*regulator
)
2412 return _regulator_get_current_limit(regulator
->rdev
);
2414 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2417 * regulator_set_mode - set regulator operating mode
2418 * @regulator: regulator source
2419 * @mode: operating mode - one of the REGULATOR_MODE constants
2421 * Set regulator operating mode to increase regulator efficiency or improve
2422 * regulation performance.
2424 * NOTE: Regulator system constraints must be set for this regulator before
2425 * calling this function otherwise this call will fail.
2427 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2429 struct regulator_dev
*rdev
= regulator
->rdev
;
2431 int regulator_curr_mode
;
2433 mutex_lock(&rdev
->mutex
);
2436 if (!rdev
->desc
->ops
->set_mode
) {
2441 /* return if the same mode is requested */
2442 if (rdev
->desc
->ops
->get_mode
) {
2443 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2444 if (regulator_curr_mode
== mode
) {
2450 /* constraints check */
2451 ret
= regulator_mode_constrain(rdev
, &mode
);
2455 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2457 mutex_unlock(&rdev
->mutex
);
2460 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2462 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2466 mutex_lock(&rdev
->mutex
);
2469 if (!rdev
->desc
->ops
->get_mode
) {
2474 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2476 mutex_unlock(&rdev
->mutex
);
2481 * regulator_get_mode - get regulator operating mode
2482 * @regulator: regulator source
2484 * Get the current regulator operating mode.
2486 unsigned int regulator_get_mode(struct regulator
*regulator
)
2488 return _regulator_get_mode(regulator
->rdev
);
2490 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2493 * regulator_set_optimum_mode - set regulator optimum operating mode
2494 * @regulator: regulator source
2495 * @uA_load: load current
2497 * Notifies the regulator core of a new device load. This is then used by
2498 * DRMS (if enabled by constraints) to set the most efficient regulator
2499 * operating mode for the new regulator loading.
2501 * Consumer devices notify their supply regulator of the maximum power
2502 * they will require (can be taken from device datasheet in the power
2503 * consumption tables) when they change operational status and hence power
2504 * state. Examples of operational state changes that can affect power
2505 * consumption are :-
2507 * o Device is opened / closed.
2508 * o Device I/O is about to begin or has just finished.
2509 * o Device is idling in between work.
2511 * This information is also exported via sysfs to userspace.
2513 * DRMS will sum the total requested load on the regulator and change
2514 * to the most efficient operating mode if platform constraints allow.
2516 * Returns the new regulator mode or error.
2518 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
2520 struct regulator_dev
*rdev
= regulator
->rdev
;
2521 struct regulator
*consumer
;
2522 int ret
, output_uV
, input_uV
, total_uA_load
= 0;
2525 mutex_lock(&rdev
->mutex
);
2528 * first check to see if we can set modes at all, otherwise just
2529 * tell the consumer everything is OK.
2531 regulator
->uA_load
= uA_load
;
2532 ret
= regulator_check_drms(rdev
);
2538 if (!rdev
->desc
->ops
->get_optimum_mode
)
2542 * we can actually do this so any errors are indicators of
2543 * potential real failure.
2547 if (!rdev
->desc
->ops
->set_mode
)
2550 /* get output voltage */
2551 output_uV
= _regulator_get_voltage(rdev
);
2552 if (output_uV
<= 0) {
2553 rdev_err(rdev
, "invalid output voltage found\n");
2557 /* get input voltage */
2560 input_uV
= regulator_get_voltage(rdev
->supply
);
2562 input_uV
= rdev
->constraints
->input_uV
;
2563 if (input_uV
<= 0) {
2564 rdev_err(rdev
, "invalid input voltage found\n");
2568 /* calc total requested load for this regulator */
2569 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
2570 total_uA_load
+= consumer
->uA_load
;
2572 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
2573 input_uV
, output_uV
,
2575 ret
= regulator_mode_constrain(rdev
, &mode
);
2577 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2578 total_uA_load
, input_uV
, output_uV
);
2582 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2584 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
2589 mutex_unlock(&rdev
->mutex
);
2592 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
2595 * regulator_register_notifier - register regulator event notifier
2596 * @regulator: regulator source
2597 * @nb: notifier block
2599 * Register notifier block to receive regulator events.
2601 int regulator_register_notifier(struct regulator
*regulator
,
2602 struct notifier_block
*nb
)
2604 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
2607 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
2610 * regulator_unregister_notifier - unregister regulator event notifier
2611 * @regulator: regulator source
2612 * @nb: notifier block
2614 * Unregister regulator event notifier block.
2616 int regulator_unregister_notifier(struct regulator
*regulator
,
2617 struct notifier_block
*nb
)
2619 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
2622 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
2624 /* notify regulator consumers and downstream regulator consumers.
2625 * Note mutex must be held by caller.
2627 static void _notifier_call_chain(struct regulator_dev
*rdev
,
2628 unsigned long event
, void *data
)
2630 /* call rdev chain first */
2631 blocking_notifier_call_chain(&rdev
->notifier
, event
, NULL
);
2635 * regulator_bulk_get - get multiple regulator consumers
2637 * @dev: Device to supply
2638 * @num_consumers: Number of consumers to register
2639 * @consumers: Configuration of consumers; clients are stored here.
2641 * @return 0 on success, an errno on failure.
2643 * This helper function allows drivers to get several regulator
2644 * consumers in one operation. If any of the regulators cannot be
2645 * acquired then any regulators that were allocated will be freed
2646 * before returning to the caller.
2648 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
2649 struct regulator_bulk_data
*consumers
)
2654 for (i
= 0; i
< num_consumers
; i
++)
2655 consumers
[i
].consumer
= NULL
;
2657 for (i
= 0; i
< num_consumers
; i
++) {
2658 consumers
[i
].consumer
= regulator_get(dev
,
2659 consumers
[i
].supply
);
2660 if (IS_ERR(consumers
[i
].consumer
)) {
2661 ret
= PTR_ERR(consumers
[i
].consumer
);
2662 dev_err(dev
, "Failed to get supply '%s': %d\n",
2663 consumers
[i
].supply
, ret
);
2664 consumers
[i
].consumer
= NULL
;
2673 regulator_put(consumers
[i
].consumer
);
2677 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
2680 * devm_regulator_bulk_get - managed get multiple regulator consumers
2682 * @dev: Device to supply
2683 * @num_consumers: Number of consumers to register
2684 * @consumers: Configuration of consumers; clients are stored here.
2686 * @return 0 on success, an errno on failure.
2688 * This helper function allows drivers to get several regulator
2689 * consumers in one operation with management, the regulators will
2690 * automatically be freed when the device is unbound. If any of the
2691 * regulators cannot be acquired then any regulators that were
2692 * allocated will be freed before returning to the caller.
2694 int devm_regulator_bulk_get(struct device
*dev
, int num_consumers
,
2695 struct regulator_bulk_data
*consumers
)
2700 for (i
= 0; i
< num_consumers
; i
++)
2701 consumers
[i
].consumer
= NULL
;
2703 for (i
= 0; i
< num_consumers
; i
++) {
2704 consumers
[i
].consumer
= devm_regulator_get(dev
,
2705 consumers
[i
].supply
);
2706 if (IS_ERR(consumers
[i
].consumer
)) {
2707 ret
= PTR_ERR(consumers
[i
].consumer
);
2708 dev_err(dev
, "Failed to get supply '%s': %d\n",
2709 consumers
[i
].supply
, ret
);
2710 consumers
[i
].consumer
= NULL
;
2718 for (i
= 0; i
< num_consumers
&& consumers
[i
].consumer
; i
++)
2719 devm_regulator_put(consumers
[i
].consumer
);
2723 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get
);
2725 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
2727 struct regulator_bulk_data
*bulk
= data
;
2729 bulk
->ret
= regulator_enable(bulk
->consumer
);
2733 * regulator_bulk_enable - enable multiple regulator consumers
2735 * @num_consumers: Number of consumers
2736 * @consumers: Consumer data; clients are stored here.
2737 * @return 0 on success, an errno on failure
2739 * This convenience API allows consumers to enable multiple regulator
2740 * clients in a single API call. If any consumers cannot be enabled
2741 * then any others that were enabled will be disabled again prior to
2744 int regulator_bulk_enable(int num_consumers
,
2745 struct regulator_bulk_data
*consumers
)
2747 LIST_HEAD(async_domain
);
2751 for (i
= 0; i
< num_consumers
; i
++) {
2752 if (consumers
[i
].consumer
->always_on
)
2753 consumers
[i
].ret
= 0;
2755 async_schedule_domain(regulator_bulk_enable_async
,
2756 &consumers
[i
], &async_domain
);
2759 async_synchronize_full_domain(&async_domain
);
2761 /* If any consumer failed we need to unwind any that succeeded */
2762 for (i
= 0; i
< num_consumers
; i
++) {
2763 if (consumers
[i
].ret
!= 0) {
2764 ret
= consumers
[i
].ret
;
2772 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
, ret
);
2774 regulator_disable(consumers
[i
].consumer
);
2778 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
2781 * regulator_bulk_disable - disable multiple regulator consumers
2783 * @num_consumers: Number of consumers
2784 * @consumers: Consumer data; clients are stored here.
2785 * @return 0 on success, an errno on failure
2787 * This convenience API allows consumers to disable multiple regulator
2788 * clients in a single API call. If any consumers cannot be disabled
2789 * then any others that were disabled will be enabled again prior to
2792 int regulator_bulk_disable(int num_consumers
,
2793 struct regulator_bulk_data
*consumers
)
2798 for (i
= num_consumers
- 1; i
>= 0; --i
) {
2799 ret
= regulator_disable(consumers
[i
].consumer
);
2807 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
2808 for (++i
; i
< num_consumers
; ++i
) {
2809 r
= regulator_enable(consumers
[i
].consumer
);
2811 pr_err("Failed to reename %s: %d\n",
2812 consumers
[i
].supply
, r
);
2817 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
2820 * regulator_bulk_force_disable - force disable multiple regulator consumers
2822 * @num_consumers: Number of consumers
2823 * @consumers: Consumer data; clients are stored here.
2824 * @return 0 on success, an errno on failure
2826 * This convenience API allows consumers to forcibly disable multiple regulator
2827 * clients in a single API call.
2828 * NOTE: This should be used for situations when device damage will
2829 * likely occur if the regulators are not disabled (e.g. over temp).
2830 * Although regulator_force_disable function call for some consumers can
2831 * return error numbers, the function is called for all consumers.
2833 int regulator_bulk_force_disable(int num_consumers
,
2834 struct regulator_bulk_data
*consumers
)
2839 for (i
= 0; i
< num_consumers
; i
++)
2841 regulator_force_disable(consumers
[i
].consumer
);
2843 for (i
= 0; i
< num_consumers
; i
++) {
2844 if (consumers
[i
].ret
!= 0) {
2845 ret
= consumers
[i
].ret
;
2854 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
2857 * regulator_bulk_free - free multiple regulator consumers
2859 * @num_consumers: Number of consumers
2860 * @consumers: Consumer data; clients are stored here.
2862 * This convenience API allows consumers to free multiple regulator
2863 * clients in a single API call.
2865 void regulator_bulk_free(int num_consumers
,
2866 struct regulator_bulk_data
*consumers
)
2870 for (i
= 0; i
< num_consumers
; i
++) {
2871 regulator_put(consumers
[i
].consumer
);
2872 consumers
[i
].consumer
= NULL
;
2875 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
2878 * regulator_notifier_call_chain - call regulator event notifier
2879 * @rdev: regulator source
2880 * @event: notifier block
2881 * @data: callback-specific data.
2883 * Called by regulator drivers to notify clients a regulator event has
2884 * occurred. We also notify regulator clients downstream.
2885 * Note lock must be held by caller.
2887 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
2888 unsigned long event
, void *data
)
2890 _notifier_call_chain(rdev
, event
, data
);
2894 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
2897 * regulator_mode_to_status - convert a regulator mode into a status
2899 * @mode: Mode to convert
2901 * Convert a regulator mode into a status.
2903 int regulator_mode_to_status(unsigned int mode
)
2906 case REGULATOR_MODE_FAST
:
2907 return REGULATOR_STATUS_FAST
;
2908 case REGULATOR_MODE_NORMAL
:
2909 return REGULATOR_STATUS_NORMAL
;
2910 case REGULATOR_MODE_IDLE
:
2911 return REGULATOR_STATUS_IDLE
;
2912 case REGULATOR_STATUS_STANDBY
:
2913 return REGULATOR_STATUS_STANDBY
;
2918 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
2921 * To avoid cluttering sysfs (and memory) with useless state, only
2922 * create attributes that can be meaningfully displayed.
2924 static int add_regulator_attributes(struct regulator_dev
*rdev
)
2926 struct device
*dev
= &rdev
->dev
;
2927 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2930 /* some attributes need specific methods to be displayed */
2931 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
2932 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0)) {
2933 status
= device_create_file(dev
, &dev_attr_microvolts
);
2937 if (ops
->get_current_limit
) {
2938 status
= device_create_file(dev
, &dev_attr_microamps
);
2942 if (ops
->get_mode
) {
2943 status
= device_create_file(dev
, &dev_attr_opmode
);
2947 if (ops
->is_enabled
) {
2948 status
= device_create_file(dev
, &dev_attr_state
);
2952 if (ops
->get_status
) {
2953 status
= device_create_file(dev
, &dev_attr_status
);
2958 /* some attributes are type-specific */
2959 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
2960 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
2965 /* all the other attributes exist to support constraints;
2966 * don't show them if there are no constraints, or if the
2967 * relevant supporting methods are missing.
2969 if (!rdev
->constraints
)
2972 /* constraints need specific supporting methods */
2973 if (ops
->set_voltage
|| ops
->set_voltage_sel
) {
2974 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
2977 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
2981 if (ops
->set_current_limit
) {
2982 status
= device_create_file(dev
, &dev_attr_min_microamps
);
2985 status
= device_create_file(dev
, &dev_attr_max_microamps
);
2990 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
2993 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
2996 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
3000 if (ops
->set_suspend_voltage
) {
3001 status
= device_create_file(dev
,
3002 &dev_attr_suspend_standby_microvolts
);
3005 status
= device_create_file(dev
,
3006 &dev_attr_suspend_mem_microvolts
);
3009 status
= device_create_file(dev
,
3010 &dev_attr_suspend_disk_microvolts
);
3015 if (ops
->set_suspend_mode
) {
3016 status
= device_create_file(dev
,
3017 &dev_attr_suspend_standby_mode
);
3020 status
= device_create_file(dev
,
3021 &dev_attr_suspend_mem_mode
);
3024 status
= device_create_file(dev
,
3025 &dev_attr_suspend_disk_mode
);
3033 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3035 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3036 if (!rdev
->debugfs
) {
3037 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3041 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3043 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3048 * regulator_register - register regulator
3049 * @regulator_desc: regulator to register
3050 * @config: runtime configuration for regulator
3052 * Called by regulator drivers to register a regulator.
3053 * Returns 0 on success.
3055 struct regulator_dev
*
3056 regulator_register(const struct regulator_desc
*regulator_desc
,
3057 const struct regulator_config
*config
)
3059 const struct regulation_constraints
*constraints
= NULL
;
3060 const struct regulator_init_data
*init_data
;
3061 static atomic_t regulator_no
= ATOMIC_INIT(0);
3062 struct regulator_dev
*rdev
;
3065 const char *supply
= NULL
;
3067 if (regulator_desc
== NULL
|| config
== NULL
)
3068 return ERR_PTR(-EINVAL
);
3073 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3074 return ERR_PTR(-EINVAL
);
3076 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3077 regulator_desc
->type
!= REGULATOR_CURRENT
)
3078 return ERR_PTR(-EINVAL
);
3080 /* Only one of each should be implemented */
3081 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3082 regulator_desc
->ops
->get_voltage_sel
);
3083 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3084 regulator_desc
->ops
->set_voltage_sel
);
3086 /* If we're using selectors we must implement list_voltage. */
3087 if (regulator_desc
->ops
->get_voltage_sel
&&
3088 !regulator_desc
->ops
->list_voltage
) {
3089 return ERR_PTR(-EINVAL
);
3091 if (regulator_desc
->ops
->set_voltage_sel
&&
3092 !regulator_desc
->ops
->list_voltage
) {
3093 return ERR_PTR(-EINVAL
);
3096 init_data
= config
->init_data
;
3098 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3100 return ERR_PTR(-ENOMEM
);
3102 mutex_lock(®ulator_list_mutex
);
3104 mutex_init(&rdev
->mutex
);
3105 rdev
->reg_data
= config
->driver_data
;
3106 rdev
->owner
= regulator_desc
->owner
;
3107 rdev
->desc
= regulator_desc
;
3108 rdev
->regmap
= config
->regmap
;
3109 INIT_LIST_HEAD(&rdev
->consumer_list
);
3110 INIT_LIST_HEAD(&rdev
->list
);
3111 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3112 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3114 /* preform any regulator specific init */
3115 if (init_data
&& init_data
->regulator_init
) {
3116 ret
= init_data
->regulator_init(rdev
->reg_data
);
3121 /* register with sysfs */
3122 rdev
->dev
.class = ®ulator_class
;
3123 rdev
->dev
.of_node
= config
->of_node
;
3124 rdev
->dev
.parent
= dev
;
3125 dev_set_name(&rdev
->dev
, "regulator.%d",
3126 atomic_inc_return(®ulator_no
) - 1);
3127 ret
= device_register(&rdev
->dev
);
3129 put_device(&rdev
->dev
);
3133 dev_set_drvdata(&rdev
->dev
, rdev
);
3135 /* set regulator constraints */
3137 constraints
= &init_data
->constraints
;
3139 ret
= set_machine_constraints(rdev
, constraints
);
3143 /* add attributes supported by this regulator */
3144 ret
= add_regulator_attributes(rdev
);
3148 if (init_data
&& init_data
->supply_regulator
)
3149 supply
= init_data
->supply_regulator
;
3150 else if (regulator_desc
->supply_name
)
3151 supply
= regulator_desc
->supply_name
;
3154 struct regulator_dev
*r
;
3156 r
= regulator_dev_lookup(dev
, supply
, &ret
);
3159 dev_err(dev
, "Failed to find supply %s\n", supply
);
3160 ret
= -EPROBE_DEFER
;
3164 ret
= set_supply(rdev
, r
);
3168 /* Enable supply if rail is enabled */
3169 if (_regulator_is_enabled(rdev
)) {
3170 ret
= regulator_enable(rdev
->supply
);
3176 /* add consumers devices */
3178 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3179 ret
= set_consumer_device_supply(rdev
,
3180 init_data
->consumer_supplies
[i
].dev_name
,
3181 init_data
->consumer_supplies
[i
].supply
);
3183 dev_err(dev
, "Failed to set supply %s\n",
3184 init_data
->consumer_supplies
[i
].supply
);
3185 goto unset_supplies
;
3190 list_add(&rdev
->list
, ®ulator_list
);
3192 rdev_init_debugfs(rdev
);
3194 mutex_unlock(®ulator_list_mutex
);
3198 unset_regulator_supplies(rdev
);
3202 regulator_put(rdev
->supply
);
3203 kfree(rdev
->constraints
);
3204 device_unregister(&rdev
->dev
);
3205 /* device core frees rdev */
3206 rdev
= ERR_PTR(ret
);
3211 rdev
= ERR_PTR(ret
);
3214 EXPORT_SYMBOL_GPL(regulator_register
);
3217 * regulator_unregister - unregister regulator
3218 * @rdev: regulator to unregister
3220 * Called by regulator drivers to unregister a regulator.
3222 void regulator_unregister(struct regulator_dev
*rdev
)
3228 regulator_put(rdev
->supply
);
3229 mutex_lock(®ulator_list_mutex
);
3230 debugfs_remove_recursive(rdev
->debugfs
);
3231 flush_work_sync(&rdev
->disable_work
.work
);
3232 WARN_ON(rdev
->open_count
);
3233 unset_regulator_supplies(rdev
);
3234 list_del(&rdev
->list
);
3235 kfree(rdev
->constraints
);
3236 device_unregister(&rdev
->dev
);
3237 mutex_unlock(®ulator_list_mutex
);
3239 EXPORT_SYMBOL_GPL(regulator_unregister
);
3242 * regulator_suspend_prepare - prepare regulators for system wide suspend
3243 * @state: system suspend state
3245 * Configure each regulator with it's suspend operating parameters for state.
3246 * This will usually be called by machine suspend code prior to supending.
3248 int regulator_suspend_prepare(suspend_state_t state
)
3250 struct regulator_dev
*rdev
;
3253 /* ON is handled by regulator active state */
3254 if (state
== PM_SUSPEND_ON
)
3257 mutex_lock(®ulator_list_mutex
);
3258 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3260 mutex_lock(&rdev
->mutex
);
3261 ret
= suspend_prepare(rdev
, state
);
3262 mutex_unlock(&rdev
->mutex
);
3265 rdev_err(rdev
, "failed to prepare\n");
3270 mutex_unlock(®ulator_list_mutex
);
3273 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3276 * regulator_suspend_finish - resume regulators from system wide suspend
3278 * Turn on regulators that might be turned off by regulator_suspend_prepare
3279 * and that should be turned on according to the regulators properties.
3281 int regulator_suspend_finish(void)
3283 struct regulator_dev
*rdev
;
3286 mutex_lock(®ulator_list_mutex
);
3287 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3288 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3290 mutex_lock(&rdev
->mutex
);
3291 if ((rdev
->use_count
> 0 || rdev
->constraints
->always_on
) &&
3293 error
= ops
->enable(rdev
);
3297 if (!has_full_constraints
)
3301 if (!_regulator_is_enabled(rdev
))
3304 error
= ops
->disable(rdev
);
3309 mutex_unlock(&rdev
->mutex
);
3311 mutex_unlock(®ulator_list_mutex
);
3314 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3317 * regulator_has_full_constraints - the system has fully specified constraints
3319 * Calling this function will cause the regulator API to disable all
3320 * regulators which have a zero use count and don't have an always_on
3321 * constraint in a late_initcall.
3323 * The intention is that this will become the default behaviour in a
3324 * future kernel release so users are encouraged to use this facility
3327 void regulator_has_full_constraints(void)
3329 has_full_constraints
= 1;
3331 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3334 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3336 * Calling this function will cause the regulator API to provide a
3337 * dummy regulator to consumers if no physical regulator is found,
3338 * allowing most consumers to proceed as though a regulator were
3339 * configured. This allows systems such as those with software
3340 * controllable regulators for the CPU core only to be brought up more
3343 void regulator_use_dummy_regulator(void)
3345 board_wants_dummy_regulator
= true;
3347 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator
);
3350 * rdev_get_drvdata - get rdev regulator driver data
3353 * Get rdev regulator driver private data. This call can be used in the
3354 * regulator driver context.
3356 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3358 return rdev
->reg_data
;
3360 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3363 * regulator_get_drvdata - get regulator driver data
3364 * @regulator: regulator
3366 * Get regulator driver private data. This call can be used in the consumer
3367 * driver context when non API regulator specific functions need to be called.
3369 void *regulator_get_drvdata(struct regulator
*regulator
)
3371 return regulator
->rdev
->reg_data
;
3373 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3376 * regulator_set_drvdata - set regulator driver data
3377 * @regulator: regulator
3380 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3382 regulator
->rdev
->reg_data
= data
;
3384 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3387 * regulator_get_id - get regulator ID
3390 int rdev_get_id(struct regulator_dev
*rdev
)
3392 return rdev
->desc
->id
;
3394 EXPORT_SYMBOL_GPL(rdev_get_id
);
3396 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3400 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3402 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3404 return reg_init_data
->driver_data
;
3406 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3408 #ifdef CONFIG_DEBUG_FS
3409 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3410 size_t count
, loff_t
*ppos
)
3412 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3413 ssize_t len
, ret
= 0;
3414 struct regulator_map
*map
;
3419 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3420 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3422 rdev_get_name(map
->regulator
), map
->dev_name
,
3426 if (ret
> PAGE_SIZE
) {
3432 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3440 static const struct file_operations supply_map_fops
= {
3441 #ifdef CONFIG_DEBUG_FS
3442 .read
= supply_map_read_file
,
3443 .llseek
= default_llseek
,
3447 static int __init
regulator_init(void)
3451 ret
= class_register(®ulator_class
);
3453 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3455 pr_warn("regulator: Failed to create debugfs directory\n");
3457 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3460 regulator_dummy_init();
3465 /* init early to allow our consumers to complete system booting */
3466 core_initcall(regulator_init
);
3468 static int __init
regulator_init_complete(void)
3470 struct regulator_dev
*rdev
;
3471 struct regulator_ops
*ops
;
3472 struct regulation_constraints
*c
;
3475 mutex_lock(®ulator_list_mutex
);
3477 /* If we have a full configuration then disable any regulators
3478 * which are not in use or always_on. This will become the
3479 * default behaviour in the future.
3481 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3482 ops
= rdev
->desc
->ops
;
3483 c
= rdev
->constraints
;
3485 if (!ops
->disable
|| (c
&& c
->always_on
))
3488 mutex_lock(&rdev
->mutex
);
3490 if (rdev
->use_count
)
3493 /* If we can't read the status assume it's on. */
3494 if (ops
->is_enabled
)
3495 enabled
= ops
->is_enabled(rdev
);
3502 if (has_full_constraints
) {
3503 /* We log since this may kill the system if it
3505 rdev_info(rdev
, "disabling\n");
3506 ret
= ops
->disable(rdev
);
3508 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
3511 /* The intention is that in future we will
3512 * assume that full constraints are provided
3513 * so warn even if we aren't going to do
3516 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
3520 mutex_unlock(&rdev
->mutex
);
3523 mutex_unlock(®ulator_list_mutex
);
3527 late_initcall(regulator_init_complete
);