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 if (rdev
->constraints
->ramp_delay
&& ops
->set_ramp_delay
) {
971 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
973 rdev_err(rdev
, "failed to set ramp_delay\n");
978 print_constraints(rdev
);
981 kfree(rdev
->constraints
);
982 rdev
->constraints
= NULL
;
987 * set_supply - set regulator supply regulator
988 * @rdev: regulator name
989 * @supply_rdev: supply regulator name
991 * Called by platform initialisation code to set the supply regulator for this
992 * regulator. This ensures that a regulators supply will also be enabled by the
993 * core if it's child is enabled.
995 static int set_supply(struct regulator_dev
*rdev
,
996 struct regulator_dev
*supply_rdev
)
1000 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1002 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1003 if (rdev
->supply
== NULL
) {
1012 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1013 * @rdev: regulator source
1014 * @consumer_dev_name: dev_name() string for device supply applies to
1015 * @supply: symbolic name for supply
1017 * Allows platform initialisation code to map physical regulator
1018 * sources to symbolic names for supplies for use by devices. Devices
1019 * should use these symbolic names to request regulators, avoiding the
1020 * need to provide board-specific regulator names as platform data.
1022 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1023 const char *consumer_dev_name
,
1026 struct regulator_map
*node
;
1032 if (consumer_dev_name
!= NULL
)
1037 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1038 if (node
->dev_name
&& consumer_dev_name
) {
1039 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1041 } else if (node
->dev_name
|| consumer_dev_name
) {
1045 if (strcmp(node
->supply
, supply
) != 0)
1048 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1050 dev_name(&node
->regulator
->dev
),
1051 node
->regulator
->desc
->name
,
1053 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1057 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1061 node
->regulator
= rdev
;
1062 node
->supply
= supply
;
1065 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1066 if (node
->dev_name
== NULL
) {
1072 list_add(&node
->list
, ®ulator_map_list
);
1076 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1078 struct regulator_map
*node
, *n
;
1080 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1081 if (rdev
== node
->regulator
) {
1082 list_del(&node
->list
);
1083 kfree(node
->dev_name
);
1089 #define REG_STR_SIZE 64
1091 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1093 const char *supply_name
)
1095 struct regulator
*regulator
;
1096 char buf
[REG_STR_SIZE
];
1099 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1100 if (regulator
== NULL
)
1103 mutex_lock(&rdev
->mutex
);
1104 regulator
->rdev
= rdev
;
1105 list_add(®ulator
->list
, &rdev
->consumer_list
);
1108 /* create a 'requested_microamps_name' sysfs entry */
1109 size
= scnprintf(buf
, REG_STR_SIZE
,
1110 "microamps_requested_%s-%s",
1111 dev_name(dev
), supply_name
);
1112 if (size
>= REG_STR_SIZE
)
1115 regulator
->dev
= dev
;
1116 sysfs_attr_init(®ulator
->dev_attr
.attr
);
1117 regulator
->dev_attr
.attr
.name
= kstrdup(buf
, GFP_KERNEL
);
1118 if (regulator
->dev_attr
.attr
.name
== NULL
)
1121 regulator
->dev_attr
.attr
.mode
= 0444;
1122 regulator
->dev_attr
.show
= device_requested_uA_show
;
1123 err
= device_create_file(dev
, ®ulator
->dev_attr
);
1125 rdev_warn(rdev
, "could not add regulator_dev requested microamps sysfs entry\n");
1129 /* also add a link to the device sysfs entry */
1130 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1131 dev
->kobj
.name
, supply_name
);
1132 if (size
>= REG_STR_SIZE
)
1135 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1136 if (regulator
->supply_name
== NULL
)
1139 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1142 rdev_warn(rdev
, "could not add device link %s err %d\n",
1143 dev
->kobj
.name
, err
);
1147 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1148 if (regulator
->supply_name
== NULL
)
1152 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1154 if (!regulator
->debugfs
) {
1155 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1157 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1158 ®ulator
->uA_load
);
1159 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1160 ®ulator
->min_uV
);
1161 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1162 ®ulator
->max_uV
);
1166 * Check now if the regulator is an always on regulator - if
1167 * it is then we don't need to do nearly so much work for
1168 * enable/disable calls.
1170 if (!_regulator_can_change_status(rdev
) &&
1171 _regulator_is_enabled(rdev
))
1172 regulator
->always_on
= true;
1174 mutex_unlock(&rdev
->mutex
);
1177 kfree(regulator
->supply_name
);
1179 device_remove_file(regulator
->dev
, ®ulator
->dev_attr
);
1181 kfree(regulator
->dev_attr
.attr
.name
);
1183 list_del(®ulator
->list
);
1185 mutex_unlock(&rdev
->mutex
);
1189 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1191 if (!rdev
->desc
->ops
->enable_time
)
1193 return rdev
->desc
->ops
->enable_time(rdev
);
1196 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1200 struct regulator_dev
*r
;
1201 struct device_node
*node
;
1202 struct regulator_map
*map
;
1203 const char *devname
= NULL
;
1205 /* first do a dt based lookup */
1206 if (dev
&& dev
->of_node
) {
1207 node
= of_get_regulator(dev
, supply
);
1209 list_for_each_entry(r
, ®ulator_list
, list
)
1210 if (r
->dev
.parent
&&
1211 node
== r
->dev
.of_node
)
1215 * If we couldn't even get the node then it's
1216 * not just that the device didn't register
1217 * yet, there's no node and we'll never
1224 /* if not found, try doing it non-dt way */
1226 devname
= dev_name(dev
);
1228 list_for_each_entry(r
, ®ulator_list
, list
)
1229 if (strcmp(rdev_get_name(r
), supply
) == 0)
1232 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1233 /* If the mapping has a device set up it must match */
1234 if (map
->dev_name
&&
1235 (!devname
|| strcmp(map
->dev_name
, devname
)))
1238 if (strcmp(map
->supply
, supply
) == 0)
1239 return map
->regulator
;
1246 /* Internal regulator request function */
1247 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1250 struct regulator_dev
*rdev
;
1251 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1252 const char *devname
= NULL
;
1256 pr_err("get() with no identifier\n");
1261 devname
= dev_name(dev
);
1263 mutex_lock(®ulator_list_mutex
);
1265 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1269 if (board_wants_dummy_regulator
) {
1270 rdev
= dummy_regulator_rdev
;
1274 #ifdef CONFIG_REGULATOR_DUMMY
1276 devname
= "deviceless";
1278 /* If the board didn't flag that it was fully constrained then
1279 * substitute in a dummy regulator so consumers can continue.
1281 if (!has_full_constraints
) {
1282 pr_warn("%s supply %s not found, using dummy regulator\n",
1284 rdev
= dummy_regulator_rdev
;
1289 mutex_unlock(®ulator_list_mutex
);
1293 if (rdev
->exclusive
) {
1294 regulator
= ERR_PTR(-EPERM
);
1298 if (exclusive
&& rdev
->open_count
) {
1299 regulator
= ERR_PTR(-EBUSY
);
1303 if (!try_module_get(rdev
->owner
))
1306 regulator
= create_regulator(rdev
, dev
, id
);
1307 if (regulator
== NULL
) {
1308 regulator
= ERR_PTR(-ENOMEM
);
1309 module_put(rdev
->owner
);
1315 rdev
->exclusive
= 1;
1317 ret
= _regulator_is_enabled(rdev
);
1319 rdev
->use_count
= 1;
1321 rdev
->use_count
= 0;
1325 mutex_unlock(®ulator_list_mutex
);
1331 * regulator_get - lookup and obtain a reference to a regulator.
1332 * @dev: device for regulator "consumer"
1333 * @id: Supply name or regulator ID.
1335 * Returns a struct regulator corresponding to the regulator producer,
1336 * or IS_ERR() condition containing errno.
1338 * Use of supply names configured via regulator_set_device_supply() is
1339 * strongly encouraged. It is recommended that the supply name used
1340 * should match the name used for the supply and/or the relevant
1341 * device pins in the datasheet.
1343 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1345 return _regulator_get(dev
, id
, 0);
1347 EXPORT_SYMBOL_GPL(regulator_get
);
1349 static void devm_regulator_release(struct device
*dev
, void *res
)
1351 regulator_put(*(struct regulator
**)res
);
1355 * devm_regulator_get - Resource managed regulator_get()
1356 * @dev: device for regulator "consumer"
1357 * @id: Supply name or regulator ID.
1359 * Managed regulator_get(). Regulators returned from this function are
1360 * automatically regulator_put() on driver detach. See regulator_get() for more
1363 struct regulator
*devm_regulator_get(struct device
*dev
, const char *id
)
1365 struct regulator
**ptr
, *regulator
;
1367 ptr
= devres_alloc(devm_regulator_release
, sizeof(*ptr
), GFP_KERNEL
);
1369 return ERR_PTR(-ENOMEM
);
1371 regulator
= regulator_get(dev
, id
);
1372 if (!IS_ERR(regulator
)) {
1374 devres_add(dev
, ptr
);
1381 EXPORT_SYMBOL_GPL(devm_regulator_get
);
1384 * regulator_get_exclusive - obtain exclusive access to a regulator.
1385 * @dev: device for regulator "consumer"
1386 * @id: Supply name or regulator ID.
1388 * Returns a struct regulator corresponding to the regulator producer,
1389 * or IS_ERR() condition containing errno. Other consumers will be
1390 * unable to obtain this reference is held and the use count for the
1391 * regulator will be initialised to reflect the current state of the
1394 * This is intended for use by consumers which cannot tolerate shared
1395 * use of the regulator such as those which need to force the
1396 * regulator off for correct operation of the hardware they are
1399 * Use of supply names configured via regulator_set_device_supply() is
1400 * strongly encouraged. It is recommended that the supply name used
1401 * should match the name used for the supply and/or the relevant
1402 * device pins in the datasheet.
1404 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1406 return _regulator_get(dev
, id
, 1);
1408 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1411 * regulator_put - "free" the regulator source
1412 * @regulator: regulator source
1414 * Note: drivers must ensure that all regulator_enable calls made on this
1415 * regulator source are balanced by regulator_disable calls prior to calling
1418 void regulator_put(struct regulator
*regulator
)
1420 struct regulator_dev
*rdev
;
1422 if (regulator
== NULL
|| IS_ERR(regulator
))
1425 mutex_lock(®ulator_list_mutex
);
1426 rdev
= regulator
->rdev
;
1428 debugfs_remove_recursive(regulator
->debugfs
);
1430 /* remove any sysfs entries */
1431 if (regulator
->dev
) {
1432 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1433 device_remove_file(regulator
->dev
, ®ulator
->dev_attr
);
1434 kfree(regulator
->dev_attr
.attr
.name
);
1436 kfree(regulator
->supply_name
);
1437 list_del(®ulator
->list
);
1441 rdev
->exclusive
= 0;
1443 module_put(rdev
->owner
);
1444 mutex_unlock(®ulator_list_mutex
);
1446 EXPORT_SYMBOL_GPL(regulator_put
);
1448 static int devm_regulator_match(struct device
*dev
, void *res
, void *data
)
1450 struct regulator
**r
= res
;
1459 * devm_regulator_put - Resource managed regulator_put()
1460 * @regulator: regulator to free
1462 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1463 * this function will not need to be called and the resource management
1464 * code will ensure that the resource is freed.
1466 void devm_regulator_put(struct regulator
*regulator
)
1470 rc
= devres_release(regulator
->dev
, devm_regulator_release
,
1471 devm_regulator_match
, regulator
);
1473 regulator_put(regulator
);
1477 EXPORT_SYMBOL_GPL(devm_regulator_put
);
1479 /* locks held by regulator_enable() */
1480 static int _regulator_enable(struct regulator_dev
*rdev
)
1484 /* check voltage and requested load before enabling */
1485 if (rdev
->constraints
&&
1486 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1487 drms_uA_update(rdev
);
1489 if (rdev
->use_count
== 0) {
1490 /* The regulator may on if it's not switchable or left on */
1491 ret
= _regulator_is_enabled(rdev
);
1492 if (ret
== -EINVAL
|| ret
== 0) {
1493 if (!_regulator_can_change_status(rdev
))
1496 if (!rdev
->desc
->ops
->enable
)
1499 /* Query before enabling in case configuration
1501 ret
= _regulator_get_enable_time(rdev
);
1505 rdev_warn(rdev
, "enable_time() failed: %d\n",
1510 trace_regulator_enable(rdev_get_name(rdev
));
1512 /* Allow the regulator to ramp; it would be useful
1513 * to extend this for bulk operations so that the
1514 * regulators can ramp together. */
1515 ret
= rdev
->desc
->ops
->enable(rdev
);
1519 trace_regulator_enable_delay(rdev_get_name(rdev
));
1521 if (delay
>= 1000) {
1522 mdelay(delay
/ 1000);
1523 udelay(delay
% 1000);
1528 trace_regulator_enable_complete(rdev_get_name(rdev
));
1530 } else if (ret
< 0) {
1531 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1534 /* Fallthrough on positive return values - already enabled */
1543 * regulator_enable - enable regulator output
1544 * @regulator: regulator source
1546 * Request that the regulator be enabled with the regulator output at
1547 * the predefined voltage or current value. Calls to regulator_enable()
1548 * must be balanced with calls to regulator_disable().
1550 * NOTE: the output value can be set by other drivers, boot loader or may be
1551 * hardwired in the regulator.
1553 int regulator_enable(struct regulator
*regulator
)
1555 struct regulator_dev
*rdev
= regulator
->rdev
;
1558 if (regulator
->always_on
)
1562 ret
= regulator_enable(rdev
->supply
);
1567 mutex_lock(&rdev
->mutex
);
1568 ret
= _regulator_enable(rdev
);
1569 mutex_unlock(&rdev
->mutex
);
1571 if (ret
!= 0 && rdev
->supply
)
1572 regulator_disable(rdev
->supply
);
1576 EXPORT_SYMBOL_GPL(regulator_enable
);
1578 /* locks held by regulator_disable() */
1579 static int _regulator_disable(struct regulator_dev
*rdev
)
1583 if (WARN(rdev
->use_count
<= 0,
1584 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1587 /* are we the last user and permitted to disable ? */
1588 if (rdev
->use_count
== 1 &&
1589 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1591 /* we are last user */
1592 if (_regulator_can_change_status(rdev
) &&
1593 rdev
->desc
->ops
->disable
) {
1594 trace_regulator_disable(rdev_get_name(rdev
));
1596 ret
= rdev
->desc
->ops
->disable(rdev
);
1598 rdev_err(rdev
, "failed to disable\n");
1602 trace_regulator_disable_complete(rdev_get_name(rdev
));
1604 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1608 rdev
->use_count
= 0;
1609 } else if (rdev
->use_count
> 1) {
1611 if (rdev
->constraints
&&
1612 (rdev
->constraints
->valid_ops_mask
&
1613 REGULATOR_CHANGE_DRMS
))
1614 drms_uA_update(rdev
);
1623 * regulator_disable - disable regulator output
1624 * @regulator: regulator source
1626 * Disable the regulator output voltage or current. Calls to
1627 * regulator_enable() must be balanced with calls to
1628 * regulator_disable().
1630 * NOTE: this will only disable the regulator output if no other consumer
1631 * devices have it enabled, the regulator device supports disabling and
1632 * machine constraints permit this operation.
1634 int regulator_disable(struct regulator
*regulator
)
1636 struct regulator_dev
*rdev
= regulator
->rdev
;
1639 if (regulator
->always_on
)
1642 mutex_lock(&rdev
->mutex
);
1643 ret
= _regulator_disable(rdev
);
1644 mutex_unlock(&rdev
->mutex
);
1646 if (ret
== 0 && rdev
->supply
)
1647 regulator_disable(rdev
->supply
);
1651 EXPORT_SYMBOL_GPL(regulator_disable
);
1653 /* locks held by regulator_force_disable() */
1654 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1659 if (rdev
->desc
->ops
->disable
) {
1660 /* ah well, who wants to live forever... */
1661 ret
= rdev
->desc
->ops
->disable(rdev
);
1663 rdev_err(rdev
, "failed to force disable\n");
1666 /* notify other consumers that power has been forced off */
1667 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1668 REGULATOR_EVENT_DISABLE
, NULL
);
1675 * regulator_force_disable - force disable regulator output
1676 * @regulator: regulator source
1678 * Forcibly disable the regulator output voltage or current.
1679 * NOTE: this *will* disable the regulator output even if other consumer
1680 * devices have it enabled. This should be used for situations when device
1681 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1683 int regulator_force_disable(struct regulator
*regulator
)
1685 struct regulator_dev
*rdev
= regulator
->rdev
;
1688 mutex_lock(&rdev
->mutex
);
1689 regulator
->uA_load
= 0;
1690 ret
= _regulator_force_disable(regulator
->rdev
);
1691 mutex_unlock(&rdev
->mutex
);
1694 while (rdev
->open_count
--)
1695 regulator_disable(rdev
->supply
);
1699 EXPORT_SYMBOL_GPL(regulator_force_disable
);
1701 static void regulator_disable_work(struct work_struct
*work
)
1703 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
1707 mutex_lock(&rdev
->mutex
);
1709 BUG_ON(!rdev
->deferred_disables
);
1711 count
= rdev
->deferred_disables
;
1712 rdev
->deferred_disables
= 0;
1714 for (i
= 0; i
< count
; i
++) {
1715 ret
= _regulator_disable(rdev
);
1717 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
1720 mutex_unlock(&rdev
->mutex
);
1723 for (i
= 0; i
< count
; i
++) {
1724 ret
= regulator_disable(rdev
->supply
);
1727 "Supply disable failed: %d\n", ret
);
1734 * regulator_disable_deferred - disable regulator output with delay
1735 * @regulator: regulator source
1736 * @ms: miliseconds until the regulator is disabled
1738 * Execute regulator_disable() on the regulator after a delay. This
1739 * is intended for use with devices that require some time to quiesce.
1741 * NOTE: this will only disable the regulator output if no other consumer
1742 * devices have it enabled, the regulator device supports disabling and
1743 * machine constraints permit this operation.
1745 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
1747 struct regulator_dev
*rdev
= regulator
->rdev
;
1750 if (regulator
->always_on
)
1753 mutex_lock(&rdev
->mutex
);
1754 rdev
->deferred_disables
++;
1755 mutex_unlock(&rdev
->mutex
);
1757 ret
= schedule_delayed_work(&rdev
->disable_work
,
1758 msecs_to_jiffies(ms
));
1764 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
1767 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1769 * @rdev: regulator to operate on
1771 * Regulators that use regmap for their register I/O can set the
1772 * enable_reg and enable_mask fields in their descriptor and then use
1773 * this as their is_enabled operation, saving some code.
1775 int regulator_is_enabled_regmap(struct regulator_dev
*rdev
)
1780 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->enable_reg
, &val
);
1784 return (val
& rdev
->desc
->enable_mask
) != 0;
1786 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap
);
1789 * regulator_enable_regmap - standard enable() for regmap users
1791 * @rdev: regulator to operate on
1793 * Regulators that use regmap for their register I/O can set the
1794 * enable_reg and enable_mask fields in their descriptor and then use
1795 * this as their enable() operation, saving some code.
1797 int regulator_enable_regmap(struct regulator_dev
*rdev
)
1799 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1800 rdev
->desc
->enable_mask
,
1801 rdev
->desc
->enable_mask
);
1803 EXPORT_SYMBOL_GPL(regulator_enable_regmap
);
1806 * regulator_disable_regmap - standard disable() for regmap users
1808 * @rdev: regulator to operate on
1810 * Regulators that use regmap for their register I/O can set the
1811 * enable_reg and enable_mask fields in their descriptor and then use
1812 * this as their disable() operation, saving some code.
1814 int regulator_disable_regmap(struct regulator_dev
*rdev
)
1816 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1817 rdev
->desc
->enable_mask
, 0);
1819 EXPORT_SYMBOL_GPL(regulator_disable_regmap
);
1821 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
1823 /* If we don't know then assume that the regulator is always on */
1824 if (!rdev
->desc
->ops
->is_enabled
)
1827 return rdev
->desc
->ops
->is_enabled(rdev
);
1831 * regulator_is_enabled - is the regulator output enabled
1832 * @regulator: regulator source
1834 * Returns positive if the regulator driver backing the source/client
1835 * has requested that the device be enabled, zero if it hasn't, else a
1836 * negative errno code.
1838 * Note that the device backing this regulator handle can have multiple
1839 * users, so it might be enabled even if regulator_enable() was never
1840 * called for this particular source.
1842 int regulator_is_enabled(struct regulator
*regulator
)
1846 if (regulator
->always_on
)
1849 mutex_lock(®ulator
->rdev
->mutex
);
1850 ret
= _regulator_is_enabled(regulator
->rdev
);
1851 mutex_unlock(®ulator
->rdev
->mutex
);
1855 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
1858 * regulator_count_voltages - count regulator_list_voltage() selectors
1859 * @regulator: regulator source
1861 * Returns number of selectors, or negative errno. Selectors are
1862 * numbered starting at zero, and typically correspond to bitfields
1863 * in hardware registers.
1865 int regulator_count_voltages(struct regulator
*regulator
)
1867 struct regulator_dev
*rdev
= regulator
->rdev
;
1869 return rdev
->desc
->n_voltages
? : -EINVAL
;
1871 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
1874 * regulator_list_voltage_linear - List voltages with simple calculation
1876 * @rdev: Regulator device
1877 * @selector: Selector to convert into a voltage
1879 * Regulators with a simple linear mapping between voltages and
1880 * selectors can set min_uV and uV_step in the regulator descriptor
1881 * and then use this function as their list_voltage() operation,
1883 int regulator_list_voltage_linear(struct regulator_dev
*rdev
,
1884 unsigned int selector
)
1886 if (selector
>= rdev
->desc
->n_voltages
)
1889 return rdev
->desc
->min_uV
+ (rdev
->desc
->uV_step
* selector
);
1891 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear
);
1894 * regulator_list_voltage_table - List voltages with table based mapping
1896 * @rdev: Regulator device
1897 * @selector: Selector to convert into a voltage
1899 * Regulators with table based mapping between voltages and
1900 * selectors can set volt_table in the regulator descriptor
1901 * and then use this function as their list_voltage() operation.
1903 int regulator_list_voltage_table(struct regulator_dev
*rdev
,
1904 unsigned int selector
)
1906 if (!rdev
->desc
->volt_table
) {
1907 BUG_ON(!rdev
->desc
->volt_table
);
1911 if (selector
>= rdev
->desc
->n_voltages
)
1914 return rdev
->desc
->volt_table
[selector
];
1916 EXPORT_SYMBOL_GPL(regulator_list_voltage_table
);
1919 * regulator_list_voltage - enumerate supported voltages
1920 * @regulator: regulator source
1921 * @selector: identify voltage to list
1922 * Context: can sleep
1924 * Returns a voltage that can be passed to @regulator_set_voltage(),
1925 * zero if this selector code can't be used on this system, or a
1928 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
1930 struct regulator_dev
*rdev
= regulator
->rdev
;
1931 struct regulator_ops
*ops
= rdev
->desc
->ops
;
1934 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
1937 mutex_lock(&rdev
->mutex
);
1938 ret
= ops
->list_voltage(rdev
, selector
);
1939 mutex_unlock(&rdev
->mutex
);
1942 if (ret
< rdev
->constraints
->min_uV
)
1944 else if (ret
> rdev
->constraints
->max_uV
)
1950 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
1953 * regulator_is_supported_voltage - check if a voltage range can be supported
1955 * @regulator: Regulator to check.
1956 * @min_uV: Minimum required voltage in uV.
1957 * @max_uV: Maximum required voltage in uV.
1959 * Returns a boolean or a negative error code.
1961 int regulator_is_supported_voltage(struct regulator
*regulator
,
1962 int min_uV
, int max_uV
)
1964 int i
, voltages
, ret
;
1966 ret
= regulator_count_voltages(regulator
);
1971 for (i
= 0; i
< voltages
; i
++) {
1972 ret
= regulator_list_voltage(regulator
, i
);
1974 if (ret
>= min_uV
&& ret
<= max_uV
)
1980 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
1983 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
1985 * @rdev: regulator to operate on
1987 * Regulators that use regmap for their register I/O can set the
1988 * vsel_reg and vsel_mask fields in their descriptor and then use this
1989 * as their get_voltage_vsel operation, saving some code.
1991 int regulator_get_voltage_sel_regmap(struct regulator_dev
*rdev
)
1996 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->vsel_reg
, &val
);
2000 val
&= rdev
->desc
->vsel_mask
;
2001 val
>>= ffs(rdev
->desc
->vsel_mask
) - 1;
2005 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap
);
2008 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2010 * @rdev: regulator to operate on
2011 * @sel: Selector to set
2013 * Regulators that use regmap for their register I/O can set the
2014 * vsel_reg and vsel_mask fields in their descriptor and then use this
2015 * as their set_voltage_vsel operation, saving some code.
2017 int regulator_set_voltage_sel_regmap(struct regulator_dev
*rdev
, unsigned sel
)
2019 sel
<<= ffs(rdev
->desc
->vsel_mask
) - 1;
2021 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->vsel_reg
,
2022 rdev
->desc
->vsel_mask
, sel
);
2024 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap
);
2027 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2029 * @rdev: Regulator to operate on
2030 * @min_uV: Lower bound for voltage
2031 * @max_uV: Upper bound for voltage
2033 * Drivers implementing set_voltage_sel() and list_voltage() can use
2034 * this as their map_voltage() operation. It will find a suitable
2035 * voltage by calling list_voltage() until it gets something in bounds
2036 * for the requested voltages.
2038 int regulator_map_voltage_iterate(struct regulator_dev
*rdev
,
2039 int min_uV
, int max_uV
)
2041 int best_val
= INT_MAX
;
2045 /* Find the smallest voltage that falls within the specified
2048 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2049 ret
= rdev
->desc
->ops
->list_voltage(rdev
, i
);
2053 if (ret
< best_val
&& ret
>= min_uV
&& ret
<= max_uV
) {
2059 if (best_val
!= INT_MAX
)
2064 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate
);
2067 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2069 * @rdev: Regulator to operate on
2070 * @min_uV: Lower bound for voltage
2071 * @max_uV: Upper bound for voltage
2073 * Drivers providing min_uV and uV_step in their regulator_desc can
2074 * use this as their map_voltage() operation.
2076 int regulator_map_voltage_linear(struct regulator_dev
*rdev
,
2077 int min_uV
, int max_uV
)
2081 /* Allow uV_step to be 0 for fixed voltage */
2082 if (rdev
->desc
->n_voltages
== 1 && rdev
->desc
->uV_step
== 0) {
2083 if (min_uV
<= rdev
->desc
->min_uV
&& rdev
->desc
->min_uV
<= max_uV
)
2089 if (!rdev
->desc
->uV_step
) {
2090 BUG_ON(!rdev
->desc
->uV_step
);
2094 if (min_uV
< rdev
->desc
->min_uV
)
2095 min_uV
= rdev
->desc
->min_uV
;
2097 ret
= DIV_ROUND_UP(min_uV
- rdev
->desc
->min_uV
, rdev
->desc
->uV_step
);
2101 /* Map back into a voltage to verify we're still in bounds */
2102 voltage
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2103 if (voltage
< min_uV
|| voltage
> max_uV
)
2108 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear
);
2110 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2111 int min_uV
, int max_uV
)
2116 unsigned int selector
;
2117 int old_selector
= -1;
2119 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2121 min_uV
+= rdev
->constraints
->uV_offset
;
2122 max_uV
+= rdev
->constraints
->uV_offset
;
2125 * If we can't obtain the old selector there is not enough
2126 * info to call set_voltage_time_sel().
2128 if (_regulator_is_enabled(rdev
) &&
2129 rdev
->desc
->ops
->set_voltage_time_sel
&&
2130 rdev
->desc
->ops
->get_voltage_sel
) {
2131 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2132 if (old_selector
< 0)
2133 return old_selector
;
2136 if (rdev
->desc
->ops
->set_voltage
) {
2137 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
,
2139 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2140 if (rdev
->desc
->ops
->map_voltage
)
2141 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2144 ret
= regulator_map_voltage_iterate(rdev
, min_uV
,
2149 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, ret
);
2155 if (rdev
->desc
->ops
->list_voltage
)
2156 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, selector
);
2160 /* Call set_voltage_time_sel if successfully obtained old_selector */
2161 if (_regulator_is_enabled(rdev
) && ret
== 0 && old_selector
>= 0 &&
2162 rdev
->desc
->ops
->set_voltage_time_sel
) {
2164 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2165 old_selector
, selector
);
2167 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2173 /* Insert any necessary delays */
2174 if (delay
>= 1000) {
2175 mdelay(delay
/ 1000);
2176 udelay(delay
% 1000);
2182 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2185 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2191 * regulator_set_voltage - set regulator output voltage
2192 * @regulator: regulator source
2193 * @min_uV: Minimum required voltage in uV
2194 * @max_uV: Maximum acceptable voltage in uV
2196 * Sets a voltage regulator to the desired output voltage. This can be set
2197 * during any regulator state. IOW, regulator can be disabled or enabled.
2199 * If the regulator is enabled then the voltage will change to the new value
2200 * immediately otherwise if the regulator is disabled the regulator will
2201 * output at the new voltage when enabled.
2203 * NOTE: If the regulator is shared between several devices then the lowest
2204 * request voltage that meets the system constraints will be used.
2205 * Regulator system constraints must be set for this regulator before
2206 * calling this function otherwise this call will fail.
2208 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2210 struct regulator_dev
*rdev
= regulator
->rdev
;
2213 mutex_lock(&rdev
->mutex
);
2215 /* If we're setting the same range as last time the change
2216 * should be a noop (some cpufreq implementations use the same
2217 * voltage for multiple frequencies, for example).
2219 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2223 if (!rdev
->desc
->ops
->set_voltage
&&
2224 !rdev
->desc
->ops
->set_voltage_sel
) {
2229 /* constraints check */
2230 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2233 regulator
->min_uV
= min_uV
;
2234 regulator
->max_uV
= max_uV
;
2236 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2240 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2243 mutex_unlock(&rdev
->mutex
);
2246 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2249 * regulator_set_voltage_time - get raise/fall time
2250 * @regulator: regulator source
2251 * @old_uV: starting voltage in microvolts
2252 * @new_uV: target voltage in microvolts
2254 * Provided with the starting and ending voltage, this function attempts to
2255 * calculate the time in microseconds required to rise or fall to this new
2258 int regulator_set_voltage_time(struct regulator
*regulator
,
2259 int old_uV
, int new_uV
)
2261 struct regulator_dev
*rdev
= regulator
->rdev
;
2262 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2268 /* Currently requires operations to do this */
2269 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2270 || !rdev
->desc
->n_voltages
)
2273 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2274 /* We only look for exact voltage matches here */
2275 voltage
= regulator_list_voltage(regulator
, i
);
2280 if (voltage
== old_uV
)
2282 if (voltage
== new_uV
)
2286 if (old_sel
< 0 || new_sel
< 0)
2289 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2291 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2294 *regulator_set_voltage_time_sel - get raise/fall time
2295 * @regulator: regulator source
2296 * @old_selector: selector for starting voltage
2297 * @new_selector: selector for target voltage
2299 * Provided with the starting and target voltage selectors, this function
2300 * returns time in microseconds required to rise or fall to this new voltage
2302 * Drivers providing ramp_delay in regulation_constraints can use this as their
2303 * set_voltage_time_sel() operation.
2305 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2306 unsigned int old_selector
,
2307 unsigned int new_selector
)
2309 unsigned int ramp_delay
= 0;
2310 int old_volt
, new_volt
;
2312 if (rdev
->constraints
->ramp_delay
)
2313 ramp_delay
= rdev
->constraints
->ramp_delay
;
2314 else if (rdev
->desc
->ramp_delay
)
2315 ramp_delay
= rdev
->desc
->ramp_delay
;
2317 if (ramp_delay
== 0) {
2318 rdev_warn(rdev
, "ramp_delay not set\n");
2323 if (!rdev
->desc
->ops
->list_voltage
)
2326 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2327 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2329 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2331 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2334 * regulator_sync_voltage - re-apply last regulator output voltage
2335 * @regulator: regulator source
2337 * Re-apply the last configured voltage. This is intended to be used
2338 * where some external control source the consumer is cooperating with
2339 * has caused the configured voltage to change.
2341 int regulator_sync_voltage(struct regulator
*regulator
)
2343 struct regulator_dev
*rdev
= regulator
->rdev
;
2344 int ret
, min_uV
, max_uV
;
2346 mutex_lock(&rdev
->mutex
);
2348 if (!rdev
->desc
->ops
->set_voltage
&&
2349 !rdev
->desc
->ops
->set_voltage_sel
) {
2354 /* This is only going to work if we've had a voltage configured. */
2355 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2360 min_uV
= regulator
->min_uV
;
2361 max_uV
= regulator
->max_uV
;
2363 /* This should be a paranoia check... */
2364 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2368 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2372 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2375 mutex_unlock(&rdev
->mutex
);
2378 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2380 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2384 if (rdev
->desc
->ops
->get_voltage_sel
) {
2385 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2388 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2389 } else if (rdev
->desc
->ops
->get_voltage
) {
2390 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2397 return ret
- rdev
->constraints
->uV_offset
;
2401 * regulator_get_voltage - get regulator output voltage
2402 * @regulator: regulator source
2404 * This returns the current regulator voltage in uV.
2406 * NOTE: If the regulator is disabled it will return the voltage value. This
2407 * function should not be used to determine regulator state.
2409 int regulator_get_voltage(struct regulator
*regulator
)
2413 mutex_lock(®ulator
->rdev
->mutex
);
2415 ret
= _regulator_get_voltage(regulator
->rdev
);
2417 mutex_unlock(®ulator
->rdev
->mutex
);
2421 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2424 * regulator_set_current_limit - set regulator output current limit
2425 * @regulator: regulator source
2426 * @min_uA: Minimuum supported current in uA
2427 * @max_uA: Maximum supported current in uA
2429 * Sets current sink to the desired output current. This can be set during
2430 * any regulator state. IOW, regulator can be disabled or enabled.
2432 * If the regulator is enabled then the current will change to the new value
2433 * immediately otherwise if the regulator is disabled the regulator will
2434 * output at the new current when enabled.
2436 * NOTE: Regulator system constraints must be set for this regulator before
2437 * calling this function otherwise this call will fail.
2439 int regulator_set_current_limit(struct regulator
*regulator
,
2440 int min_uA
, int max_uA
)
2442 struct regulator_dev
*rdev
= regulator
->rdev
;
2445 mutex_lock(&rdev
->mutex
);
2448 if (!rdev
->desc
->ops
->set_current_limit
) {
2453 /* constraints check */
2454 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2458 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2460 mutex_unlock(&rdev
->mutex
);
2463 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2465 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2469 mutex_lock(&rdev
->mutex
);
2472 if (!rdev
->desc
->ops
->get_current_limit
) {
2477 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2479 mutex_unlock(&rdev
->mutex
);
2484 * regulator_get_current_limit - get regulator output current
2485 * @regulator: regulator source
2487 * This returns the current supplied by the specified current sink in uA.
2489 * NOTE: If the regulator is disabled it will return the current value. This
2490 * function should not be used to determine regulator state.
2492 int regulator_get_current_limit(struct regulator
*regulator
)
2494 return _regulator_get_current_limit(regulator
->rdev
);
2496 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2499 * regulator_set_mode - set regulator operating mode
2500 * @regulator: regulator source
2501 * @mode: operating mode - one of the REGULATOR_MODE constants
2503 * Set regulator operating mode to increase regulator efficiency or improve
2504 * regulation performance.
2506 * NOTE: Regulator system constraints must be set for this regulator before
2507 * calling this function otherwise this call will fail.
2509 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2511 struct regulator_dev
*rdev
= regulator
->rdev
;
2513 int regulator_curr_mode
;
2515 mutex_lock(&rdev
->mutex
);
2518 if (!rdev
->desc
->ops
->set_mode
) {
2523 /* return if the same mode is requested */
2524 if (rdev
->desc
->ops
->get_mode
) {
2525 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2526 if (regulator_curr_mode
== mode
) {
2532 /* constraints check */
2533 ret
= regulator_mode_constrain(rdev
, &mode
);
2537 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2539 mutex_unlock(&rdev
->mutex
);
2542 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2544 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2548 mutex_lock(&rdev
->mutex
);
2551 if (!rdev
->desc
->ops
->get_mode
) {
2556 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2558 mutex_unlock(&rdev
->mutex
);
2563 * regulator_get_mode - get regulator operating mode
2564 * @regulator: regulator source
2566 * Get the current regulator operating mode.
2568 unsigned int regulator_get_mode(struct regulator
*regulator
)
2570 return _regulator_get_mode(regulator
->rdev
);
2572 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2575 * regulator_set_optimum_mode - set regulator optimum operating mode
2576 * @regulator: regulator source
2577 * @uA_load: load current
2579 * Notifies the regulator core of a new device load. This is then used by
2580 * DRMS (if enabled by constraints) to set the most efficient regulator
2581 * operating mode for the new regulator loading.
2583 * Consumer devices notify their supply regulator of the maximum power
2584 * they will require (can be taken from device datasheet in the power
2585 * consumption tables) when they change operational status and hence power
2586 * state. Examples of operational state changes that can affect power
2587 * consumption are :-
2589 * o Device is opened / closed.
2590 * o Device I/O is about to begin or has just finished.
2591 * o Device is idling in between work.
2593 * This information is also exported via sysfs to userspace.
2595 * DRMS will sum the total requested load on the regulator and change
2596 * to the most efficient operating mode if platform constraints allow.
2598 * Returns the new regulator mode or error.
2600 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
2602 struct regulator_dev
*rdev
= regulator
->rdev
;
2603 struct regulator
*consumer
;
2604 int ret
, output_uV
, input_uV
, total_uA_load
= 0;
2607 mutex_lock(&rdev
->mutex
);
2610 * first check to see if we can set modes at all, otherwise just
2611 * tell the consumer everything is OK.
2613 regulator
->uA_load
= uA_load
;
2614 ret
= regulator_check_drms(rdev
);
2620 if (!rdev
->desc
->ops
->get_optimum_mode
)
2624 * we can actually do this so any errors are indicators of
2625 * potential real failure.
2629 if (!rdev
->desc
->ops
->set_mode
)
2632 /* get output voltage */
2633 output_uV
= _regulator_get_voltage(rdev
);
2634 if (output_uV
<= 0) {
2635 rdev_err(rdev
, "invalid output voltage found\n");
2639 /* get input voltage */
2642 input_uV
= regulator_get_voltage(rdev
->supply
);
2644 input_uV
= rdev
->constraints
->input_uV
;
2645 if (input_uV
<= 0) {
2646 rdev_err(rdev
, "invalid input voltage found\n");
2650 /* calc total requested load for this regulator */
2651 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
2652 total_uA_load
+= consumer
->uA_load
;
2654 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
2655 input_uV
, output_uV
,
2657 ret
= regulator_mode_constrain(rdev
, &mode
);
2659 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2660 total_uA_load
, input_uV
, output_uV
);
2664 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2666 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
2671 mutex_unlock(&rdev
->mutex
);
2674 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
2677 * regulator_register_notifier - register regulator event notifier
2678 * @regulator: regulator source
2679 * @nb: notifier block
2681 * Register notifier block to receive regulator events.
2683 int regulator_register_notifier(struct regulator
*regulator
,
2684 struct notifier_block
*nb
)
2686 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
2689 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
2692 * regulator_unregister_notifier - unregister regulator event notifier
2693 * @regulator: regulator source
2694 * @nb: notifier block
2696 * Unregister regulator event notifier block.
2698 int regulator_unregister_notifier(struct regulator
*regulator
,
2699 struct notifier_block
*nb
)
2701 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
2704 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
2706 /* notify regulator consumers and downstream regulator consumers.
2707 * Note mutex must be held by caller.
2709 static void _notifier_call_chain(struct regulator_dev
*rdev
,
2710 unsigned long event
, void *data
)
2712 /* call rdev chain first */
2713 blocking_notifier_call_chain(&rdev
->notifier
, event
, NULL
);
2717 * regulator_bulk_get - get multiple regulator consumers
2719 * @dev: Device to supply
2720 * @num_consumers: Number of consumers to register
2721 * @consumers: Configuration of consumers; clients are stored here.
2723 * @return 0 on success, an errno on failure.
2725 * This helper function allows drivers to get several regulator
2726 * consumers in one operation. If any of the regulators cannot be
2727 * acquired then any regulators that were allocated will be freed
2728 * before returning to the caller.
2730 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
2731 struct regulator_bulk_data
*consumers
)
2736 for (i
= 0; i
< num_consumers
; i
++)
2737 consumers
[i
].consumer
= NULL
;
2739 for (i
= 0; i
< num_consumers
; i
++) {
2740 consumers
[i
].consumer
= regulator_get(dev
,
2741 consumers
[i
].supply
);
2742 if (IS_ERR(consumers
[i
].consumer
)) {
2743 ret
= PTR_ERR(consumers
[i
].consumer
);
2744 dev_err(dev
, "Failed to get supply '%s': %d\n",
2745 consumers
[i
].supply
, ret
);
2746 consumers
[i
].consumer
= NULL
;
2755 regulator_put(consumers
[i
].consumer
);
2759 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
2762 * devm_regulator_bulk_get - managed get multiple regulator consumers
2764 * @dev: Device to supply
2765 * @num_consumers: Number of consumers to register
2766 * @consumers: Configuration of consumers; clients are stored here.
2768 * @return 0 on success, an errno on failure.
2770 * This helper function allows drivers to get several regulator
2771 * consumers in one operation with management, the regulators will
2772 * automatically be freed when the device is unbound. If any of the
2773 * regulators cannot be acquired then any regulators that were
2774 * allocated will be freed before returning to the caller.
2776 int devm_regulator_bulk_get(struct device
*dev
, int num_consumers
,
2777 struct regulator_bulk_data
*consumers
)
2782 for (i
= 0; i
< num_consumers
; i
++)
2783 consumers
[i
].consumer
= NULL
;
2785 for (i
= 0; i
< num_consumers
; i
++) {
2786 consumers
[i
].consumer
= devm_regulator_get(dev
,
2787 consumers
[i
].supply
);
2788 if (IS_ERR(consumers
[i
].consumer
)) {
2789 ret
= PTR_ERR(consumers
[i
].consumer
);
2790 dev_err(dev
, "Failed to get supply '%s': %d\n",
2791 consumers
[i
].supply
, ret
);
2792 consumers
[i
].consumer
= NULL
;
2800 for (i
= 0; i
< num_consumers
&& consumers
[i
].consumer
; i
++)
2801 devm_regulator_put(consumers
[i
].consumer
);
2805 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get
);
2807 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
2809 struct regulator_bulk_data
*bulk
= data
;
2811 bulk
->ret
= regulator_enable(bulk
->consumer
);
2815 * regulator_bulk_enable - enable multiple regulator consumers
2817 * @num_consumers: Number of consumers
2818 * @consumers: Consumer data; clients are stored here.
2819 * @return 0 on success, an errno on failure
2821 * This convenience API allows consumers to enable multiple regulator
2822 * clients in a single API call. If any consumers cannot be enabled
2823 * then any others that were enabled will be disabled again prior to
2826 int regulator_bulk_enable(int num_consumers
,
2827 struct regulator_bulk_data
*consumers
)
2829 LIST_HEAD(async_domain
);
2833 for (i
= 0; i
< num_consumers
; i
++) {
2834 if (consumers
[i
].consumer
->always_on
)
2835 consumers
[i
].ret
= 0;
2837 async_schedule_domain(regulator_bulk_enable_async
,
2838 &consumers
[i
], &async_domain
);
2841 async_synchronize_full_domain(&async_domain
);
2843 /* If any consumer failed we need to unwind any that succeeded */
2844 for (i
= 0; i
< num_consumers
; i
++) {
2845 if (consumers
[i
].ret
!= 0) {
2846 ret
= consumers
[i
].ret
;
2854 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
, ret
);
2856 regulator_disable(consumers
[i
].consumer
);
2860 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
2863 * regulator_bulk_disable - disable multiple regulator consumers
2865 * @num_consumers: Number of consumers
2866 * @consumers: Consumer data; clients are stored here.
2867 * @return 0 on success, an errno on failure
2869 * This convenience API allows consumers to disable multiple regulator
2870 * clients in a single API call. If any consumers cannot be disabled
2871 * then any others that were disabled will be enabled again prior to
2874 int regulator_bulk_disable(int num_consumers
,
2875 struct regulator_bulk_data
*consumers
)
2880 for (i
= num_consumers
- 1; i
>= 0; --i
) {
2881 ret
= regulator_disable(consumers
[i
].consumer
);
2889 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
2890 for (++i
; i
< num_consumers
; ++i
) {
2891 r
= regulator_enable(consumers
[i
].consumer
);
2893 pr_err("Failed to reename %s: %d\n",
2894 consumers
[i
].supply
, r
);
2899 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
2902 * regulator_bulk_force_disable - force disable multiple regulator consumers
2904 * @num_consumers: Number of consumers
2905 * @consumers: Consumer data; clients are stored here.
2906 * @return 0 on success, an errno on failure
2908 * This convenience API allows consumers to forcibly disable multiple regulator
2909 * clients in a single API call.
2910 * NOTE: This should be used for situations when device damage will
2911 * likely occur if the regulators are not disabled (e.g. over temp).
2912 * Although regulator_force_disable function call for some consumers can
2913 * return error numbers, the function is called for all consumers.
2915 int regulator_bulk_force_disable(int num_consumers
,
2916 struct regulator_bulk_data
*consumers
)
2921 for (i
= 0; i
< num_consumers
; i
++)
2923 regulator_force_disable(consumers
[i
].consumer
);
2925 for (i
= 0; i
< num_consumers
; i
++) {
2926 if (consumers
[i
].ret
!= 0) {
2927 ret
= consumers
[i
].ret
;
2936 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
2939 * regulator_bulk_free - free multiple regulator consumers
2941 * @num_consumers: Number of consumers
2942 * @consumers: Consumer data; clients are stored here.
2944 * This convenience API allows consumers to free multiple regulator
2945 * clients in a single API call.
2947 void regulator_bulk_free(int num_consumers
,
2948 struct regulator_bulk_data
*consumers
)
2952 for (i
= 0; i
< num_consumers
; i
++) {
2953 regulator_put(consumers
[i
].consumer
);
2954 consumers
[i
].consumer
= NULL
;
2957 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
2960 * regulator_notifier_call_chain - call regulator event notifier
2961 * @rdev: regulator source
2962 * @event: notifier block
2963 * @data: callback-specific data.
2965 * Called by regulator drivers to notify clients a regulator event has
2966 * occurred. We also notify regulator clients downstream.
2967 * Note lock must be held by caller.
2969 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
2970 unsigned long event
, void *data
)
2972 _notifier_call_chain(rdev
, event
, data
);
2976 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
2979 * regulator_mode_to_status - convert a regulator mode into a status
2981 * @mode: Mode to convert
2983 * Convert a regulator mode into a status.
2985 int regulator_mode_to_status(unsigned int mode
)
2988 case REGULATOR_MODE_FAST
:
2989 return REGULATOR_STATUS_FAST
;
2990 case REGULATOR_MODE_NORMAL
:
2991 return REGULATOR_STATUS_NORMAL
;
2992 case REGULATOR_MODE_IDLE
:
2993 return REGULATOR_STATUS_IDLE
;
2994 case REGULATOR_STATUS_STANDBY
:
2995 return REGULATOR_STATUS_STANDBY
;
3000 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3003 * To avoid cluttering sysfs (and memory) with useless state, only
3004 * create attributes that can be meaningfully displayed.
3006 static int add_regulator_attributes(struct regulator_dev
*rdev
)
3008 struct device
*dev
= &rdev
->dev
;
3009 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3012 /* some attributes need specific methods to be displayed */
3013 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3014 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0)) {
3015 status
= device_create_file(dev
, &dev_attr_microvolts
);
3019 if (ops
->get_current_limit
) {
3020 status
= device_create_file(dev
, &dev_attr_microamps
);
3024 if (ops
->get_mode
) {
3025 status
= device_create_file(dev
, &dev_attr_opmode
);
3029 if (ops
->is_enabled
) {
3030 status
= device_create_file(dev
, &dev_attr_state
);
3034 if (ops
->get_status
) {
3035 status
= device_create_file(dev
, &dev_attr_status
);
3040 /* some attributes are type-specific */
3041 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
3042 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
3047 /* all the other attributes exist to support constraints;
3048 * don't show them if there are no constraints, or if the
3049 * relevant supporting methods are missing.
3051 if (!rdev
->constraints
)
3054 /* constraints need specific supporting methods */
3055 if (ops
->set_voltage
|| ops
->set_voltage_sel
) {
3056 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
3059 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
3063 if (ops
->set_current_limit
) {
3064 status
= device_create_file(dev
, &dev_attr_min_microamps
);
3067 status
= device_create_file(dev
, &dev_attr_max_microamps
);
3072 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
3075 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
3078 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
3082 if (ops
->set_suspend_voltage
) {
3083 status
= device_create_file(dev
,
3084 &dev_attr_suspend_standby_microvolts
);
3087 status
= device_create_file(dev
,
3088 &dev_attr_suspend_mem_microvolts
);
3091 status
= device_create_file(dev
,
3092 &dev_attr_suspend_disk_microvolts
);
3097 if (ops
->set_suspend_mode
) {
3098 status
= device_create_file(dev
,
3099 &dev_attr_suspend_standby_mode
);
3102 status
= device_create_file(dev
,
3103 &dev_attr_suspend_mem_mode
);
3106 status
= device_create_file(dev
,
3107 &dev_attr_suspend_disk_mode
);
3115 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3117 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3118 if (!rdev
->debugfs
) {
3119 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3123 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3125 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3130 * regulator_register - register regulator
3131 * @regulator_desc: regulator to register
3132 * @config: runtime configuration for regulator
3134 * Called by regulator drivers to register a regulator.
3135 * Returns 0 on success.
3137 struct regulator_dev
*
3138 regulator_register(const struct regulator_desc
*regulator_desc
,
3139 const struct regulator_config
*config
)
3141 const struct regulation_constraints
*constraints
= NULL
;
3142 const struct regulator_init_data
*init_data
;
3143 static atomic_t regulator_no
= ATOMIC_INIT(0);
3144 struct regulator_dev
*rdev
;
3147 const char *supply
= NULL
;
3149 if (regulator_desc
== NULL
|| config
== NULL
)
3150 return ERR_PTR(-EINVAL
);
3155 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3156 return ERR_PTR(-EINVAL
);
3158 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3159 regulator_desc
->type
!= REGULATOR_CURRENT
)
3160 return ERR_PTR(-EINVAL
);
3162 /* Only one of each should be implemented */
3163 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3164 regulator_desc
->ops
->get_voltage_sel
);
3165 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3166 regulator_desc
->ops
->set_voltage_sel
);
3168 /* If we're using selectors we must implement list_voltage. */
3169 if (regulator_desc
->ops
->get_voltage_sel
&&
3170 !regulator_desc
->ops
->list_voltage
) {
3171 return ERR_PTR(-EINVAL
);
3173 if (regulator_desc
->ops
->set_voltage_sel
&&
3174 !regulator_desc
->ops
->list_voltage
) {
3175 return ERR_PTR(-EINVAL
);
3178 init_data
= config
->init_data
;
3180 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3182 return ERR_PTR(-ENOMEM
);
3184 mutex_lock(®ulator_list_mutex
);
3186 mutex_init(&rdev
->mutex
);
3187 rdev
->reg_data
= config
->driver_data
;
3188 rdev
->owner
= regulator_desc
->owner
;
3189 rdev
->desc
= regulator_desc
;
3191 rdev
->regmap
= config
->regmap
;
3193 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3194 INIT_LIST_HEAD(&rdev
->consumer_list
);
3195 INIT_LIST_HEAD(&rdev
->list
);
3196 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3197 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3199 /* preform any regulator specific init */
3200 if (init_data
&& init_data
->regulator_init
) {
3201 ret
= init_data
->regulator_init(rdev
->reg_data
);
3206 /* register with sysfs */
3207 rdev
->dev
.class = ®ulator_class
;
3208 rdev
->dev
.of_node
= config
->of_node
;
3209 rdev
->dev
.parent
= dev
;
3210 dev_set_name(&rdev
->dev
, "regulator.%d",
3211 atomic_inc_return(®ulator_no
) - 1);
3212 ret
= device_register(&rdev
->dev
);
3214 put_device(&rdev
->dev
);
3218 dev_set_drvdata(&rdev
->dev
, rdev
);
3220 /* set regulator constraints */
3222 constraints
= &init_data
->constraints
;
3224 ret
= set_machine_constraints(rdev
, constraints
);
3228 /* add attributes supported by this regulator */
3229 ret
= add_regulator_attributes(rdev
);
3233 if (init_data
&& init_data
->supply_regulator
)
3234 supply
= init_data
->supply_regulator
;
3235 else if (regulator_desc
->supply_name
)
3236 supply
= regulator_desc
->supply_name
;
3239 struct regulator_dev
*r
;
3241 r
= regulator_dev_lookup(dev
, supply
, &ret
);
3244 dev_err(dev
, "Failed to find supply %s\n", supply
);
3245 ret
= -EPROBE_DEFER
;
3249 ret
= set_supply(rdev
, r
);
3253 /* Enable supply if rail is enabled */
3254 if (_regulator_is_enabled(rdev
)) {
3255 ret
= regulator_enable(rdev
->supply
);
3261 /* add consumers devices */
3263 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3264 ret
= set_consumer_device_supply(rdev
,
3265 init_data
->consumer_supplies
[i
].dev_name
,
3266 init_data
->consumer_supplies
[i
].supply
);
3268 dev_err(dev
, "Failed to set supply %s\n",
3269 init_data
->consumer_supplies
[i
].supply
);
3270 goto unset_supplies
;
3275 list_add(&rdev
->list
, ®ulator_list
);
3277 rdev_init_debugfs(rdev
);
3279 mutex_unlock(®ulator_list_mutex
);
3283 unset_regulator_supplies(rdev
);
3287 regulator_put(rdev
->supply
);
3288 kfree(rdev
->constraints
);
3289 device_unregister(&rdev
->dev
);
3290 /* device core frees rdev */
3291 rdev
= ERR_PTR(ret
);
3296 rdev
= ERR_PTR(ret
);
3299 EXPORT_SYMBOL_GPL(regulator_register
);
3302 * regulator_unregister - unregister regulator
3303 * @rdev: regulator to unregister
3305 * Called by regulator drivers to unregister a regulator.
3307 void regulator_unregister(struct regulator_dev
*rdev
)
3313 regulator_put(rdev
->supply
);
3314 mutex_lock(®ulator_list_mutex
);
3315 debugfs_remove_recursive(rdev
->debugfs
);
3316 flush_work_sync(&rdev
->disable_work
.work
);
3317 WARN_ON(rdev
->open_count
);
3318 unset_regulator_supplies(rdev
);
3319 list_del(&rdev
->list
);
3320 kfree(rdev
->constraints
);
3321 device_unregister(&rdev
->dev
);
3322 mutex_unlock(®ulator_list_mutex
);
3324 EXPORT_SYMBOL_GPL(regulator_unregister
);
3327 * regulator_suspend_prepare - prepare regulators for system wide suspend
3328 * @state: system suspend state
3330 * Configure each regulator with it's suspend operating parameters for state.
3331 * This will usually be called by machine suspend code prior to supending.
3333 int regulator_suspend_prepare(suspend_state_t state
)
3335 struct regulator_dev
*rdev
;
3338 /* ON is handled by regulator active state */
3339 if (state
== PM_SUSPEND_ON
)
3342 mutex_lock(®ulator_list_mutex
);
3343 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3345 mutex_lock(&rdev
->mutex
);
3346 ret
= suspend_prepare(rdev
, state
);
3347 mutex_unlock(&rdev
->mutex
);
3350 rdev_err(rdev
, "failed to prepare\n");
3355 mutex_unlock(®ulator_list_mutex
);
3358 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3361 * regulator_suspend_finish - resume regulators from system wide suspend
3363 * Turn on regulators that might be turned off by regulator_suspend_prepare
3364 * and that should be turned on according to the regulators properties.
3366 int regulator_suspend_finish(void)
3368 struct regulator_dev
*rdev
;
3371 mutex_lock(®ulator_list_mutex
);
3372 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3373 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3375 mutex_lock(&rdev
->mutex
);
3376 if ((rdev
->use_count
> 0 || rdev
->constraints
->always_on
) &&
3378 error
= ops
->enable(rdev
);
3382 if (!has_full_constraints
)
3386 if (!_regulator_is_enabled(rdev
))
3389 error
= ops
->disable(rdev
);
3394 mutex_unlock(&rdev
->mutex
);
3396 mutex_unlock(®ulator_list_mutex
);
3399 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3402 * regulator_has_full_constraints - the system has fully specified constraints
3404 * Calling this function will cause the regulator API to disable all
3405 * regulators which have a zero use count and don't have an always_on
3406 * constraint in a late_initcall.
3408 * The intention is that this will become the default behaviour in a
3409 * future kernel release so users are encouraged to use this facility
3412 void regulator_has_full_constraints(void)
3414 has_full_constraints
= 1;
3416 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3419 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3421 * Calling this function will cause the regulator API to provide a
3422 * dummy regulator to consumers if no physical regulator is found,
3423 * allowing most consumers to proceed as though a regulator were
3424 * configured. This allows systems such as those with software
3425 * controllable regulators for the CPU core only to be brought up more
3428 void regulator_use_dummy_regulator(void)
3430 board_wants_dummy_regulator
= true;
3432 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator
);
3435 * rdev_get_drvdata - get rdev regulator driver data
3438 * Get rdev regulator driver private data. This call can be used in the
3439 * regulator driver context.
3441 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3443 return rdev
->reg_data
;
3445 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3448 * regulator_get_drvdata - get regulator driver data
3449 * @regulator: regulator
3451 * Get regulator driver private data. This call can be used in the consumer
3452 * driver context when non API regulator specific functions need to be called.
3454 void *regulator_get_drvdata(struct regulator
*regulator
)
3456 return regulator
->rdev
->reg_data
;
3458 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3461 * regulator_set_drvdata - set regulator driver data
3462 * @regulator: regulator
3465 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3467 regulator
->rdev
->reg_data
= data
;
3469 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3472 * regulator_get_id - get regulator ID
3475 int rdev_get_id(struct regulator_dev
*rdev
)
3477 return rdev
->desc
->id
;
3479 EXPORT_SYMBOL_GPL(rdev_get_id
);
3481 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3485 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3487 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3489 return reg_init_data
->driver_data
;
3491 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3493 #ifdef CONFIG_DEBUG_FS
3494 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3495 size_t count
, loff_t
*ppos
)
3497 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3498 ssize_t len
, ret
= 0;
3499 struct regulator_map
*map
;
3504 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3505 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3507 rdev_get_name(map
->regulator
), map
->dev_name
,
3511 if (ret
> PAGE_SIZE
) {
3517 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3525 static const struct file_operations supply_map_fops
= {
3526 #ifdef CONFIG_DEBUG_FS
3527 .read
= supply_map_read_file
,
3528 .llseek
= default_llseek
,
3532 static int __init
regulator_init(void)
3536 ret
= class_register(®ulator_class
);
3538 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3540 pr_warn("regulator: Failed to create debugfs directory\n");
3542 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3545 regulator_dummy_init();
3550 /* init early to allow our consumers to complete system booting */
3551 core_initcall(regulator_init
);
3553 static int __init
regulator_init_complete(void)
3555 struct regulator_dev
*rdev
;
3556 struct regulator_ops
*ops
;
3557 struct regulation_constraints
*c
;
3560 mutex_lock(®ulator_list_mutex
);
3562 /* If we have a full configuration then disable any regulators
3563 * which are not in use or always_on. This will become the
3564 * default behaviour in the future.
3566 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3567 ops
= rdev
->desc
->ops
;
3568 c
= rdev
->constraints
;
3570 if (!ops
->disable
|| (c
&& c
->always_on
))
3573 mutex_lock(&rdev
->mutex
);
3575 if (rdev
->use_count
)
3578 /* If we can't read the status assume it's on. */
3579 if (ops
->is_enabled
)
3580 enabled
= ops
->is_enabled(rdev
);
3587 if (has_full_constraints
) {
3588 /* We log since this may kill the system if it
3590 rdev_info(rdev
, "disabling\n");
3591 ret
= ops
->disable(rdev
);
3593 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
3596 /* The intention is that in future we will
3597 * assume that full constraints are provided
3598 * so warn even if we aren't going to do
3601 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
3605 mutex_unlock(&rdev
->mutex
);
3608 mutex_unlock(®ulator_list_mutex
);
3612 late_initcall(regulator_init_complete
);