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>
26 #include <linux/gpio.h>
27 #include <linux/gpio/consumer.h>
29 #include <linux/regmap.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/module.h>
36 #define CREATE_TRACE_POINTS
37 #include <trace/events/regulator.h>
42 #define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 #define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
53 static DEFINE_MUTEX(regulator_list_mutex
);
54 static LIST_HEAD(regulator_list
);
55 static LIST_HEAD(regulator_map_list
);
56 static LIST_HEAD(regulator_ena_gpio_list
);
57 static LIST_HEAD(regulator_supply_alias_list
);
58 static bool has_full_constraints
;
60 static struct dentry
*debugfs_root
;
63 * struct regulator_map
65 * Used to provide symbolic supply names to devices.
67 struct regulator_map
{
68 struct list_head list
;
69 const char *dev_name
; /* The dev_name() for the consumer */
71 struct regulator_dev
*regulator
;
75 * struct regulator_enable_gpio
77 * Management for shared enable GPIO pin
79 struct regulator_enable_gpio
{
80 struct list_head list
;
81 struct gpio_desc
*gpiod
;
82 u32 enable_count
; /* a number of enabled shared GPIO */
83 u32 request_count
; /* a number of requested shared GPIO */
84 unsigned int ena_gpio_invert
:1;
88 * struct regulator_supply_alias
90 * Used to map lookups for a supply onto an alternative device.
92 struct regulator_supply_alias
{
93 struct list_head list
;
94 struct device
*src_dev
;
95 const char *src_supply
;
96 struct device
*alias_dev
;
97 const char *alias_supply
;
100 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
101 static int _regulator_disable(struct regulator_dev
*rdev
);
102 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
103 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
104 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
105 static int _notifier_call_chain(struct regulator_dev
*rdev
,
106 unsigned long event
, void *data
);
107 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
108 int min_uV
, int max_uV
);
109 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
111 const char *supply_name
);
112 static void _regulator_put(struct regulator
*regulator
);
114 static struct regulator_dev
*dev_to_rdev(struct device
*dev
)
116 return container_of(dev
, struct regulator_dev
, dev
);
119 static const char *rdev_get_name(struct regulator_dev
*rdev
)
121 if (rdev
->constraints
&& rdev
->constraints
->name
)
122 return rdev
->constraints
->name
;
123 else if (rdev
->desc
->name
)
124 return rdev
->desc
->name
;
129 static bool have_full_constraints(void)
131 return has_full_constraints
|| of_have_populated_dt();
135 * of_get_regulator - get a regulator device node based on supply name
136 * @dev: Device pointer for the consumer (of regulator) device
137 * @supply: regulator supply name
139 * Extract the regulator device node corresponding to the supply name.
140 * returns the device node corresponding to the regulator if found, else
143 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
145 struct device_node
*regnode
= NULL
;
146 char prop_name
[32]; /* 32 is max size of property name */
148 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
150 snprintf(prop_name
, 32, "%s-supply", supply
);
151 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
154 dev_dbg(dev
, "Looking up %s property in node %s failed",
155 prop_name
, dev
->of_node
->full_name
);
161 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
163 if (!rdev
->constraints
)
166 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
172 /* Platform voltage constraint check */
173 static int regulator_check_voltage(struct regulator_dev
*rdev
,
174 int *min_uV
, int *max_uV
)
176 BUG_ON(*min_uV
> *max_uV
);
178 if (!rdev
->constraints
) {
179 rdev_err(rdev
, "no constraints\n");
182 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
183 rdev_err(rdev
, "operation not allowed\n");
187 if (*max_uV
> rdev
->constraints
->max_uV
)
188 *max_uV
= rdev
->constraints
->max_uV
;
189 if (*min_uV
< rdev
->constraints
->min_uV
)
190 *min_uV
= rdev
->constraints
->min_uV
;
192 if (*min_uV
> *max_uV
) {
193 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
201 /* Make sure we select a voltage that suits the needs of all
202 * regulator consumers
204 static int regulator_check_consumers(struct regulator_dev
*rdev
,
205 int *min_uV
, int *max_uV
)
207 struct regulator
*regulator
;
209 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
211 * Assume consumers that didn't say anything are OK
212 * with anything in the constraint range.
214 if (!regulator
->min_uV
&& !regulator
->max_uV
)
217 if (*max_uV
> regulator
->max_uV
)
218 *max_uV
= regulator
->max_uV
;
219 if (*min_uV
< regulator
->min_uV
)
220 *min_uV
= regulator
->min_uV
;
223 if (*min_uV
> *max_uV
) {
224 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
232 /* current constraint check */
233 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
234 int *min_uA
, int *max_uA
)
236 BUG_ON(*min_uA
> *max_uA
);
238 if (!rdev
->constraints
) {
239 rdev_err(rdev
, "no constraints\n");
242 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
243 rdev_err(rdev
, "operation not allowed\n");
247 if (*max_uA
> rdev
->constraints
->max_uA
)
248 *max_uA
= rdev
->constraints
->max_uA
;
249 if (*min_uA
< rdev
->constraints
->min_uA
)
250 *min_uA
= rdev
->constraints
->min_uA
;
252 if (*min_uA
> *max_uA
) {
253 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
261 /* operating mode constraint check */
262 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
265 case REGULATOR_MODE_FAST
:
266 case REGULATOR_MODE_NORMAL
:
267 case REGULATOR_MODE_IDLE
:
268 case REGULATOR_MODE_STANDBY
:
271 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
275 if (!rdev
->constraints
) {
276 rdev_err(rdev
, "no constraints\n");
279 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
280 rdev_err(rdev
, "operation not allowed\n");
284 /* The modes are bitmasks, the most power hungry modes having
285 * the lowest values. If the requested mode isn't supported
286 * try higher modes. */
288 if (rdev
->constraints
->valid_modes_mask
& *mode
)
296 /* dynamic regulator mode switching constraint check */
297 static int regulator_check_drms(struct regulator_dev
*rdev
)
299 if (!rdev
->constraints
) {
300 rdev_err(rdev
, "no constraints\n");
303 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
304 rdev_dbg(rdev
, "operation not allowed\n");
310 static ssize_t
regulator_uV_show(struct device
*dev
,
311 struct device_attribute
*attr
, char *buf
)
313 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
316 mutex_lock(&rdev
->mutex
);
317 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
318 mutex_unlock(&rdev
->mutex
);
322 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
324 static ssize_t
regulator_uA_show(struct device
*dev
,
325 struct device_attribute
*attr
, char *buf
)
327 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
329 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
331 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
333 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
336 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
338 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
340 static DEVICE_ATTR_RO(name
);
342 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
345 case REGULATOR_MODE_FAST
:
346 return sprintf(buf
, "fast\n");
347 case REGULATOR_MODE_NORMAL
:
348 return sprintf(buf
, "normal\n");
349 case REGULATOR_MODE_IDLE
:
350 return sprintf(buf
, "idle\n");
351 case REGULATOR_MODE_STANDBY
:
352 return sprintf(buf
, "standby\n");
354 return sprintf(buf
, "unknown\n");
357 static ssize_t
regulator_opmode_show(struct device
*dev
,
358 struct device_attribute
*attr
, char *buf
)
360 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
362 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
364 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
366 static ssize_t
regulator_print_state(char *buf
, int state
)
369 return sprintf(buf
, "enabled\n");
371 return sprintf(buf
, "disabled\n");
373 return sprintf(buf
, "unknown\n");
376 static ssize_t
regulator_state_show(struct device
*dev
,
377 struct device_attribute
*attr
, char *buf
)
379 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
382 mutex_lock(&rdev
->mutex
);
383 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
384 mutex_unlock(&rdev
->mutex
);
388 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
390 static ssize_t
regulator_status_show(struct device
*dev
,
391 struct device_attribute
*attr
, char *buf
)
393 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
397 status
= rdev
->desc
->ops
->get_status(rdev
);
402 case REGULATOR_STATUS_OFF
:
405 case REGULATOR_STATUS_ON
:
408 case REGULATOR_STATUS_ERROR
:
411 case REGULATOR_STATUS_FAST
:
414 case REGULATOR_STATUS_NORMAL
:
417 case REGULATOR_STATUS_IDLE
:
420 case REGULATOR_STATUS_STANDBY
:
423 case REGULATOR_STATUS_BYPASS
:
426 case REGULATOR_STATUS_UNDEFINED
:
433 return sprintf(buf
, "%s\n", label
);
435 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
437 static ssize_t
regulator_min_uA_show(struct device
*dev
,
438 struct device_attribute
*attr
, char *buf
)
440 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
442 if (!rdev
->constraints
)
443 return sprintf(buf
, "constraint not defined\n");
445 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
447 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
449 static ssize_t
regulator_max_uA_show(struct device
*dev
,
450 struct device_attribute
*attr
, char *buf
)
452 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
454 if (!rdev
->constraints
)
455 return sprintf(buf
, "constraint not defined\n");
457 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
459 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
461 static ssize_t
regulator_min_uV_show(struct device
*dev
,
462 struct device_attribute
*attr
, char *buf
)
464 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
466 if (!rdev
->constraints
)
467 return sprintf(buf
, "constraint not defined\n");
469 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
471 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
473 static ssize_t
regulator_max_uV_show(struct device
*dev
,
474 struct device_attribute
*attr
, char *buf
)
476 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
478 if (!rdev
->constraints
)
479 return sprintf(buf
, "constraint not defined\n");
481 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
483 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
485 static ssize_t
regulator_total_uA_show(struct device
*dev
,
486 struct device_attribute
*attr
, char *buf
)
488 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
489 struct regulator
*regulator
;
492 mutex_lock(&rdev
->mutex
);
493 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
494 uA
+= regulator
->uA_load
;
495 mutex_unlock(&rdev
->mutex
);
496 return sprintf(buf
, "%d\n", uA
);
498 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
500 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
503 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
504 return sprintf(buf
, "%d\n", rdev
->use_count
);
506 static DEVICE_ATTR_RO(num_users
);
508 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
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");
521 static DEVICE_ATTR_RO(type
);
523 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
524 struct device_attribute
*attr
, char *buf
)
526 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
528 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
530 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
531 regulator_suspend_mem_uV_show
, NULL
);
533 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
534 struct device_attribute
*attr
, char *buf
)
536 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
538 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
540 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
541 regulator_suspend_disk_uV_show
, NULL
);
543 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
544 struct device_attribute
*attr
, char *buf
)
546 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
548 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
550 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
551 regulator_suspend_standby_uV_show
, NULL
);
553 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
554 struct device_attribute
*attr
, char *buf
)
556 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
558 return regulator_print_opmode(buf
,
559 rdev
->constraints
->state_mem
.mode
);
561 static DEVICE_ATTR(suspend_mem_mode
, 0444,
562 regulator_suspend_mem_mode_show
, NULL
);
564 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
565 struct device_attribute
*attr
, char *buf
)
567 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
569 return regulator_print_opmode(buf
,
570 rdev
->constraints
->state_disk
.mode
);
572 static DEVICE_ATTR(suspend_disk_mode
, 0444,
573 regulator_suspend_disk_mode_show
, NULL
);
575 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
576 struct device_attribute
*attr
, char *buf
)
578 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
580 return regulator_print_opmode(buf
,
581 rdev
->constraints
->state_standby
.mode
);
583 static DEVICE_ATTR(suspend_standby_mode
, 0444,
584 regulator_suspend_standby_mode_show
, NULL
);
586 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
587 struct device_attribute
*attr
, char *buf
)
589 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
591 return regulator_print_state(buf
,
592 rdev
->constraints
->state_mem
.enabled
);
594 static DEVICE_ATTR(suspend_mem_state
, 0444,
595 regulator_suspend_mem_state_show
, NULL
);
597 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
598 struct device_attribute
*attr
, char *buf
)
600 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
602 return regulator_print_state(buf
,
603 rdev
->constraints
->state_disk
.enabled
);
605 static DEVICE_ATTR(suspend_disk_state
, 0444,
606 regulator_suspend_disk_state_show
, NULL
);
608 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
609 struct device_attribute
*attr
, char *buf
)
611 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
613 return regulator_print_state(buf
,
614 rdev
->constraints
->state_standby
.enabled
);
616 static DEVICE_ATTR(suspend_standby_state
, 0444,
617 regulator_suspend_standby_state_show
, NULL
);
619 static ssize_t
regulator_bypass_show(struct device
*dev
,
620 struct device_attribute
*attr
, char *buf
)
622 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
627 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
636 return sprintf(buf
, "%s\n", report
);
638 static DEVICE_ATTR(bypass
, 0444,
639 regulator_bypass_show
, NULL
);
641 /* Calculate the new optimum regulator operating mode based on the new total
642 * consumer load. All locks held by caller */
643 static int drms_uA_update(struct regulator_dev
*rdev
)
645 struct regulator
*sibling
;
646 int current_uA
= 0, output_uV
, input_uV
, err
;
649 lockdep_assert_held_once(&rdev
->mutex
);
652 * first check to see if we can set modes at all, otherwise just
653 * tell the consumer everything is OK.
655 err
= regulator_check_drms(rdev
);
659 if (!rdev
->desc
->ops
->get_optimum_mode
&&
660 !rdev
->desc
->ops
->set_load
)
663 if (!rdev
->desc
->ops
->set_mode
&&
664 !rdev
->desc
->ops
->set_load
)
667 /* get output voltage */
668 output_uV
= _regulator_get_voltage(rdev
);
669 if (output_uV
<= 0) {
670 rdev_err(rdev
, "invalid output voltage found\n");
674 /* get input voltage */
677 input_uV
= regulator_get_voltage(rdev
->supply
);
679 input_uV
= rdev
->constraints
->input_uV
;
681 rdev_err(rdev
, "invalid input voltage found\n");
685 /* calc total requested load */
686 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
687 current_uA
+= sibling
->uA_load
;
689 current_uA
+= rdev
->constraints
->system_load
;
691 if (rdev
->desc
->ops
->set_load
) {
692 /* set the optimum mode for our new total regulator load */
693 err
= rdev
->desc
->ops
->set_load(rdev
, current_uA
);
695 rdev_err(rdev
, "failed to set load %d\n", current_uA
);
697 /* now get the optimum mode for our new total regulator load */
698 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
699 output_uV
, current_uA
);
701 /* check the new mode is allowed */
702 err
= regulator_mode_constrain(rdev
, &mode
);
704 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
705 current_uA
, input_uV
, output_uV
);
709 err
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
711 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
717 static int suspend_set_state(struct regulator_dev
*rdev
,
718 struct regulator_state
*rstate
)
722 /* If we have no suspend mode configration don't set anything;
723 * only warn if the driver implements set_suspend_voltage or
724 * set_suspend_mode callback.
726 if (!rstate
->enabled
&& !rstate
->disabled
) {
727 if (rdev
->desc
->ops
->set_suspend_voltage
||
728 rdev
->desc
->ops
->set_suspend_mode
)
729 rdev_warn(rdev
, "No configuration\n");
733 if (rstate
->enabled
&& rstate
->disabled
) {
734 rdev_err(rdev
, "invalid configuration\n");
738 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
739 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
740 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
741 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
742 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
746 rdev_err(rdev
, "failed to enabled/disable\n");
750 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
751 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
753 rdev_err(rdev
, "failed to set voltage\n");
758 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
759 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
761 rdev_err(rdev
, "failed to set mode\n");
768 /* locks held by caller */
769 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
771 lockdep_assert_held_once(&rdev
->mutex
);
773 if (!rdev
->constraints
)
777 case PM_SUSPEND_STANDBY
:
778 return suspend_set_state(rdev
,
779 &rdev
->constraints
->state_standby
);
781 return suspend_set_state(rdev
,
782 &rdev
->constraints
->state_mem
);
784 return suspend_set_state(rdev
,
785 &rdev
->constraints
->state_disk
);
791 static void print_constraints(struct regulator_dev
*rdev
)
793 struct regulation_constraints
*constraints
= rdev
->constraints
;
795 size_t len
= sizeof(buf
) - 1;
799 if (constraints
->min_uV
&& constraints
->max_uV
) {
800 if (constraints
->min_uV
== constraints
->max_uV
)
801 count
+= scnprintf(buf
+ count
, len
- count
, "%d mV ",
802 constraints
->min_uV
/ 1000);
804 count
+= scnprintf(buf
+ count
, len
- count
,
806 constraints
->min_uV
/ 1000,
807 constraints
->max_uV
/ 1000);
810 if (!constraints
->min_uV
||
811 constraints
->min_uV
!= constraints
->max_uV
) {
812 ret
= _regulator_get_voltage(rdev
);
814 count
+= scnprintf(buf
+ count
, len
- count
,
815 "at %d mV ", ret
/ 1000);
818 if (constraints
->uV_offset
)
819 count
+= scnprintf(buf
+ count
, len
- count
, "%dmV offset ",
820 constraints
->uV_offset
/ 1000);
822 if (constraints
->min_uA
&& constraints
->max_uA
) {
823 if (constraints
->min_uA
== constraints
->max_uA
)
824 count
+= scnprintf(buf
+ count
, len
- count
, "%d mA ",
825 constraints
->min_uA
/ 1000);
827 count
+= scnprintf(buf
+ count
, len
- count
,
829 constraints
->min_uA
/ 1000,
830 constraints
->max_uA
/ 1000);
833 if (!constraints
->min_uA
||
834 constraints
->min_uA
!= constraints
->max_uA
) {
835 ret
= _regulator_get_current_limit(rdev
);
837 count
+= scnprintf(buf
+ count
, len
- count
,
838 "at %d mA ", ret
/ 1000);
841 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
842 count
+= scnprintf(buf
+ count
, len
- count
, "fast ");
843 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
844 count
+= scnprintf(buf
+ count
, len
- count
, "normal ");
845 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
846 count
+= scnprintf(buf
+ count
, len
- count
, "idle ");
847 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
848 count
+= scnprintf(buf
+ count
, len
- count
, "standby");
851 scnprintf(buf
, len
, "no parameters");
853 rdev_dbg(rdev
, "%s\n", buf
);
855 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
856 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
858 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
861 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
862 struct regulation_constraints
*constraints
)
864 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
867 /* do we need to apply the constraint voltage */
868 if (rdev
->constraints
->apply_uV
&&
869 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
870 int current_uV
= _regulator_get_voltage(rdev
);
871 if (current_uV
< 0) {
873 "failed to get the current voltage(%d)\n",
877 if (current_uV
< rdev
->constraints
->min_uV
||
878 current_uV
> rdev
->constraints
->max_uV
) {
879 ret
= _regulator_do_set_voltage(
880 rdev
, rdev
->constraints
->min_uV
,
881 rdev
->constraints
->max_uV
);
884 "failed to apply %duV constraint(%d)\n",
885 rdev
->constraints
->min_uV
, ret
);
891 /* constrain machine-level voltage specs to fit
892 * the actual range supported by this regulator.
894 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
895 int count
= rdev
->desc
->n_voltages
;
897 int min_uV
= INT_MAX
;
898 int max_uV
= INT_MIN
;
899 int cmin
= constraints
->min_uV
;
900 int cmax
= constraints
->max_uV
;
902 /* it's safe to autoconfigure fixed-voltage supplies
903 and the constraints are used by list_voltage. */
904 if (count
== 1 && !cmin
) {
907 constraints
->min_uV
= cmin
;
908 constraints
->max_uV
= cmax
;
911 /* voltage constraints are optional */
912 if ((cmin
== 0) && (cmax
== 0))
915 /* else require explicit machine-level constraints */
916 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
917 rdev_err(rdev
, "invalid voltage constraints\n");
921 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
922 for (i
= 0; i
< count
; i
++) {
925 value
= ops
->list_voltage(rdev
, i
);
929 /* maybe adjust [min_uV..max_uV] */
930 if (value
>= cmin
&& value
< min_uV
)
932 if (value
<= cmax
&& value
> max_uV
)
936 /* final: [min_uV..max_uV] valid iff constraints valid */
937 if (max_uV
< min_uV
) {
939 "unsupportable voltage constraints %u-%uuV\n",
944 /* use regulator's subset of machine constraints */
945 if (constraints
->min_uV
< min_uV
) {
946 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
947 constraints
->min_uV
, min_uV
);
948 constraints
->min_uV
= min_uV
;
950 if (constraints
->max_uV
> max_uV
) {
951 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
952 constraints
->max_uV
, max_uV
);
953 constraints
->max_uV
= max_uV
;
960 static int machine_constraints_current(struct regulator_dev
*rdev
,
961 struct regulation_constraints
*constraints
)
963 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
966 if (!constraints
->min_uA
&& !constraints
->max_uA
)
969 if (constraints
->min_uA
> constraints
->max_uA
) {
970 rdev_err(rdev
, "Invalid current constraints\n");
974 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
975 rdev_warn(rdev
, "Operation of current configuration missing\n");
979 /* Set regulator current in constraints range */
980 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
981 constraints
->max_uA
);
983 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
990 static int _regulator_do_enable(struct regulator_dev
*rdev
);
993 * set_machine_constraints - sets regulator constraints
994 * @rdev: regulator source
995 * @constraints: constraints to apply
997 * Allows platform initialisation code to define and constrain
998 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
999 * Constraints *must* be set by platform code in order for some
1000 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1003 static int set_machine_constraints(struct regulator_dev
*rdev
,
1004 const struct regulation_constraints
*constraints
)
1007 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1010 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
1013 rdev
->constraints
= kzalloc(sizeof(*constraints
),
1015 if (!rdev
->constraints
)
1018 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
1022 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
1026 if (rdev
->constraints
->ilim_uA
&& ops
->set_input_current_limit
) {
1027 ret
= ops
->set_input_current_limit(rdev
,
1028 rdev
->constraints
->ilim_uA
);
1030 rdev_err(rdev
, "failed to set input limit\n");
1035 /* do we need to setup our suspend state */
1036 if (rdev
->constraints
->initial_state
) {
1037 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
1039 rdev_err(rdev
, "failed to set suspend state\n");
1044 if (rdev
->constraints
->initial_mode
) {
1045 if (!ops
->set_mode
) {
1046 rdev_err(rdev
, "no set_mode operation\n");
1051 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1053 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1058 /* If the constraints say the regulator should be on at this point
1059 * and we have control then make sure it is enabled.
1061 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
1062 ret
= _regulator_do_enable(rdev
);
1063 if (ret
< 0 && ret
!= -EINVAL
) {
1064 rdev_err(rdev
, "failed to enable\n");
1069 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1070 && ops
->set_ramp_delay
) {
1071 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1073 rdev_err(rdev
, "failed to set ramp_delay\n");
1078 if (rdev
->constraints
->pull_down
&& ops
->set_pull_down
) {
1079 ret
= ops
->set_pull_down(rdev
);
1081 rdev_err(rdev
, "failed to set pull down\n");
1086 if (rdev
->constraints
->soft_start
&& ops
->set_soft_start
) {
1087 ret
= ops
->set_soft_start(rdev
);
1089 rdev_err(rdev
, "failed to set soft start\n");
1094 if (rdev
->constraints
->over_current_protection
1095 && ops
->set_over_current_protection
) {
1096 ret
= ops
->set_over_current_protection(rdev
);
1098 rdev_err(rdev
, "failed to set over current protection\n");
1103 print_constraints(rdev
);
1106 kfree(rdev
->constraints
);
1107 rdev
->constraints
= NULL
;
1112 * set_supply - set regulator supply regulator
1113 * @rdev: regulator name
1114 * @supply_rdev: supply regulator name
1116 * Called by platform initialisation code to set the supply regulator for this
1117 * regulator. This ensures that a regulators supply will also be enabled by the
1118 * core if it's child is enabled.
1120 static int set_supply(struct regulator_dev
*rdev
,
1121 struct regulator_dev
*supply_rdev
)
1125 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1127 if (!try_module_get(supply_rdev
->owner
))
1130 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1131 if (rdev
->supply
== NULL
) {
1135 supply_rdev
->open_count
++;
1141 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1142 * @rdev: regulator source
1143 * @consumer_dev_name: dev_name() string for device supply applies to
1144 * @supply: symbolic name for supply
1146 * Allows platform initialisation code to map physical regulator
1147 * sources to symbolic names for supplies for use by devices. Devices
1148 * should use these symbolic names to request regulators, avoiding the
1149 * need to provide board-specific regulator names as platform data.
1151 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1152 const char *consumer_dev_name
,
1155 struct regulator_map
*node
;
1161 if (consumer_dev_name
!= NULL
)
1166 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1167 if (node
->dev_name
&& consumer_dev_name
) {
1168 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1170 } else if (node
->dev_name
|| consumer_dev_name
) {
1174 if (strcmp(node
->supply
, supply
) != 0)
1177 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1179 dev_name(&node
->regulator
->dev
),
1180 node
->regulator
->desc
->name
,
1182 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1186 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1190 node
->regulator
= rdev
;
1191 node
->supply
= supply
;
1194 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1195 if (node
->dev_name
== NULL
) {
1201 list_add(&node
->list
, ®ulator_map_list
);
1205 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1207 struct regulator_map
*node
, *n
;
1209 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1210 if (rdev
== node
->regulator
) {
1211 list_del(&node
->list
);
1212 kfree(node
->dev_name
);
1218 #define REG_STR_SIZE 64
1220 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1222 const char *supply_name
)
1224 struct regulator
*regulator
;
1225 char buf
[REG_STR_SIZE
];
1228 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1229 if (regulator
== NULL
)
1232 mutex_lock(&rdev
->mutex
);
1233 regulator
->rdev
= rdev
;
1234 list_add(®ulator
->list
, &rdev
->consumer_list
);
1237 regulator
->dev
= dev
;
1239 /* Add a link to the device sysfs entry */
1240 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1241 dev
->kobj
.name
, supply_name
);
1242 if (size
>= REG_STR_SIZE
)
1245 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1246 if (regulator
->supply_name
== NULL
)
1249 err
= sysfs_create_link_nowarn(&rdev
->dev
.kobj
, &dev
->kobj
,
1252 rdev_dbg(rdev
, "could not add device link %s err %d\n",
1253 dev
->kobj
.name
, err
);
1257 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1258 if (regulator
->supply_name
== NULL
)
1262 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1264 if (!regulator
->debugfs
) {
1265 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1267 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1268 ®ulator
->uA_load
);
1269 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1270 ®ulator
->min_uV
);
1271 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1272 ®ulator
->max_uV
);
1276 * Check now if the regulator is an always on regulator - if
1277 * it is then we don't need to do nearly so much work for
1278 * enable/disable calls.
1280 if (!_regulator_can_change_status(rdev
) &&
1281 _regulator_is_enabled(rdev
))
1282 regulator
->always_on
= true;
1284 mutex_unlock(&rdev
->mutex
);
1287 list_del(®ulator
->list
);
1289 mutex_unlock(&rdev
->mutex
);
1293 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1295 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1296 return rdev
->constraints
->enable_time
;
1297 if (!rdev
->desc
->ops
->enable_time
)
1298 return rdev
->desc
->enable_time
;
1299 return rdev
->desc
->ops
->enable_time(rdev
);
1302 static struct regulator_supply_alias
*regulator_find_supply_alias(
1303 struct device
*dev
, const char *supply
)
1305 struct regulator_supply_alias
*map
;
1307 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1308 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1314 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1316 struct regulator_supply_alias
*map
;
1318 map
= regulator_find_supply_alias(*dev
, *supply
);
1320 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1321 *supply
, map
->alias_supply
,
1322 dev_name(map
->alias_dev
));
1323 *dev
= map
->alias_dev
;
1324 *supply
= map
->alias_supply
;
1328 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1332 struct regulator_dev
*r
;
1333 struct device_node
*node
;
1334 struct regulator_map
*map
;
1335 const char *devname
= NULL
;
1337 regulator_supply_alias(&dev
, &supply
);
1339 /* first do a dt based lookup */
1340 if (dev
&& dev
->of_node
) {
1341 node
= of_get_regulator(dev
, supply
);
1343 list_for_each_entry(r
, ®ulator_list
, list
)
1344 if (r
->dev
.parent
&&
1345 node
== r
->dev
.of_node
)
1347 *ret
= -EPROBE_DEFER
;
1351 * If we couldn't even get the node then it's
1352 * not just that the device didn't register
1353 * yet, there's no node and we'll never
1360 /* if not found, try doing it non-dt way */
1362 devname
= dev_name(dev
);
1364 list_for_each_entry(r
, ®ulator_list
, list
)
1365 if (strcmp(rdev_get_name(r
), supply
) == 0)
1368 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1369 /* If the mapping has a device set up it must match */
1370 if (map
->dev_name
&&
1371 (!devname
|| strcmp(map
->dev_name
, devname
)))
1374 if (strcmp(map
->supply
, supply
) == 0)
1375 return map
->regulator
;
1382 static int regulator_resolve_supply(struct regulator_dev
*rdev
)
1384 struct regulator_dev
*r
;
1385 struct device
*dev
= rdev
->dev
.parent
;
1388 /* No supply to resovle? */
1389 if (!rdev
->supply_name
)
1392 /* Supply already resolved? */
1396 r
= regulator_dev_lookup(dev
, rdev
->supply_name
, &ret
);
1397 if (ret
== -ENODEV
) {
1399 * No supply was specified for this regulator and
1400 * there will never be one.
1406 if (have_full_constraints()) {
1407 r
= dummy_regulator_rdev
;
1409 dev_err(dev
, "Failed to resolve %s-supply for %s\n",
1410 rdev
->supply_name
, rdev
->desc
->name
);
1411 return -EPROBE_DEFER
;
1415 /* Recursively resolve the supply of the supply */
1416 ret
= regulator_resolve_supply(r
);
1420 ret
= set_supply(rdev
, r
);
1424 /* Cascade always-on state to supply */
1425 if (_regulator_is_enabled(rdev
)) {
1426 ret
= regulator_enable(rdev
->supply
);
1429 _regulator_put(rdev
->supply
);
1437 /* Internal regulator request function */
1438 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1439 bool exclusive
, bool allow_dummy
)
1441 struct regulator_dev
*rdev
;
1442 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1443 const char *devname
= NULL
;
1447 pr_err("get() with no identifier\n");
1448 return ERR_PTR(-EINVAL
);
1452 devname
= dev_name(dev
);
1454 if (have_full_constraints())
1457 ret
= -EPROBE_DEFER
;
1459 mutex_lock(®ulator_list_mutex
);
1461 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1465 regulator
= ERR_PTR(ret
);
1468 * If we have return value from dev_lookup fail, we do not expect to
1469 * succeed, so, quit with appropriate error value
1471 if (ret
&& ret
!= -ENODEV
)
1475 devname
= "deviceless";
1478 * Assume that a regulator is physically present and enabled
1479 * even if it isn't hooked up and just provide a dummy.
1481 if (have_full_constraints() && allow_dummy
) {
1482 pr_warn("%s supply %s not found, using dummy regulator\n",
1485 rdev
= dummy_regulator_rdev
;
1487 /* Don't log an error when called from regulator_get_optional() */
1488 } else if (!have_full_constraints() || exclusive
) {
1489 dev_warn(dev
, "dummy supplies not allowed\n");
1492 mutex_unlock(®ulator_list_mutex
);
1496 if (rdev
->exclusive
) {
1497 regulator
= ERR_PTR(-EPERM
);
1501 if (exclusive
&& rdev
->open_count
) {
1502 regulator
= ERR_PTR(-EBUSY
);
1506 ret
= regulator_resolve_supply(rdev
);
1508 regulator
= ERR_PTR(ret
);
1512 if (!try_module_get(rdev
->owner
))
1515 regulator
= create_regulator(rdev
, dev
, id
);
1516 if (regulator
== NULL
) {
1517 regulator
= ERR_PTR(-ENOMEM
);
1518 module_put(rdev
->owner
);
1524 rdev
->exclusive
= 1;
1526 ret
= _regulator_is_enabled(rdev
);
1528 rdev
->use_count
= 1;
1530 rdev
->use_count
= 0;
1534 mutex_unlock(®ulator_list_mutex
);
1540 * regulator_get - lookup and obtain a reference to a regulator.
1541 * @dev: device for regulator "consumer"
1542 * @id: Supply name or regulator ID.
1544 * Returns a struct regulator corresponding to the regulator producer,
1545 * or IS_ERR() condition containing errno.
1547 * Use of supply names configured via regulator_set_device_supply() is
1548 * strongly encouraged. It is recommended that the supply name used
1549 * should match the name used for the supply and/or the relevant
1550 * device pins in the datasheet.
1552 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1554 return _regulator_get(dev
, id
, false, true);
1556 EXPORT_SYMBOL_GPL(regulator_get
);
1559 * regulator_get_exclusive - obtain exclusive access to a regulator.
1560 * @dev: device for regulator "consumer"
1561 * @id: Supply name or regulator ID.
1563 * Returns a struct regulator corresponding to the regulator producer,
1564 * or IS_ERR() condition containing errno. Other consumers will be
1565 * unable to obtain this regulator while this reference is held and the
1566 * use count for the regulator will be initialised to reflect the current
1567 * state of the regulator.
1569 * This is intended for use by consumers which cannot tolerate shared
1570 * use of the regulator such as those which need to force the
1571 * regulator off for correct operation of the hardware they are
1574 * Use of supply names configured via regulator_set_device_supply() is
1575 * strongly encouraged. It is recommended that the supply name used
1576 * should match the name used for the supply and/or the relevant
1577 * device pins in the datasheet.
1579 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1581 return _regulator_get(dev
, id
, true, false);
1583 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1586 * regulator_get_optional - obtain optional access to a regulator.
1587 * @dev: device for regulator "consumer"
1588 * @id: Supply name or regulator ID.
1590 * Returns a struct regulator corresponding to the regulator producer,
1591 * or IS_ERR() condition containing errno.
1593 * This is intended for use by consumers for devices which can have
1594 * some supplies unconnected in normal use, such as some MMC devices.
1595 * It can allow the regulator core to provide stub supplies for other
1596 * supplies requested using normal regulator_get() calls without
1597 * disrupting the operation of drivers that can handle absent
1600 * Use of supply names configured via regulator_set_device_supply() is
1601 * strongly encouraged. It is recommended that the supply name used
1602 * should match the name used for the supply and/or the relevant
1603 * device pins in the datasheet.
1605 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1607 return _regulator_get(dev
, id
, false, false);
1609 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1611 /* regulator_list_mutex lock held by regulator_put() */
1612 static void _regulator_put(struct regulator
*regulator
)
1614 struct regulator_dev
*rdev
;
1616 if (IS_ERR_OR_NULL(regulator
))
1619 lockdep_assert_held_once(®ulator_list_mutex
);
1621 rdev
= regulator
->rdev
;
1623 debugfs_remove_recursive(regulator
->debugfs
);
1625 /* remove any sysfs entries */
1627 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1628 mutex_lock(&rdev
->mutex
);
1629 list_del(®ulator
->list
);
1632 rdev
->exclusive
= 0;
1633 mutex_unlock(&rdev
->mutex
);
1635 kfree(regulator
->supply_name
);
1638 module_put(rdev
->owner
);
1642 * regulator_put - "free" the regulator source
1643 * @regulator: regulator source
1645 * Note: drivers must ensure that all regulator_enable calls made on this
1646 * regulator source are balanced by regulator_disable calls prior to calling
1649 void regulator_put(struct regulator
*regulator
)
1651 mutex_lock(®ulator_list_mutex
);
1652 _regulator_put(regulator
);
1653 mutex_unlock(®ulator_list_mutex
);
1655 EXPORT_SYMBOL_GPL(regulator_put
);
1658 * regulator_register_supply_alias - Provide device alias for supply lookup
1660 * @dev: device that will be given as the regulator "consumer"
1661 * @id: Supply name or regulator ID
1662 * @alias_dev: device that should be used to lookup the supply
1663 * @alias_id: Supply name or regulator ID that should be used to lookup the
1666 * All lookups for id on dev will instead be conducted for alias_id on
1669 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1670 struct device
*alias_dev
,
1671 const char *alias_id
)
1673 struct regulator_supply_alias
*map
;
1675 map
= regulator_find_supply_alias(dev
, id
);
1679 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1684 map
->src_supply
= id
;
1685 map
->alias_dev
= alias_dev
;
1686 map
->alias_supply
= alias_id
;
1688 list_add(&map
->list
, ®ulator_supply_alias_list
);
1690 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1691 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1695 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1698 * regulator_unregister_supply_alias - Remove device alias
1700 * @dev: device that will be given as the regulator "consumer"
1701 * @id: Supply name or regulator ID
1703 * Remove a lookup alias if one exists for id on dev.
1705 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1707 struct regulator_supply_alias
*map
;
1709 map
= regulator_find_supply_alias(dev
, id
);
1711 list_del(&map
->list
);
1715 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1718 * regulator_bulk_register_supply_alias - register multiple aliases
1720 * @dev: device that will be given as the regulator "consumer"
1721 * @id: List of supply names or regulator IDs
1722 * @alias_dev: device that should be used to lookup the supply
1723 * @alias_id: List of supply names or regulator IDs that should be used to
1725 * @num_id: Number of aliases to register
1727 * @return 0 on success, an errno on failure.
1729 * This helper function allows drivers to register several supply
1730 * aliases in one operation. If any of the aliases cannot be
1731 * registered any aliases that were registered will be removed
1732 * before returning to the caller.
1734 int regulator_bulk_register_supply_alias(struct device
*dev
,
1735 const char *const *id
,
1736 struct device
*alias_dev
,
1737 const char *const *alias_id
,
1743 for (i
= 0; i
< num_id
; ++i
) {
1744 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1754 "Failed to create supply alias %s,%s -> %s,%s\n",
1755 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1758 regulator_unregister_supply_alias(dev
, id
[i
]);
1762 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1765 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1767 * @dev: device that will be given as the regulator "consumer"
1768 * @id: List of supply names or regulator IDs
1769 * @num_id: Number of aliases to unregister
1771 * This helper function allows drivers to unregister several supply
1772 * aliases in one operation.
1774 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1775 const char *const *id
,
1780 for (i
= 0; i
< num_id
; ++i
)
1781 regulator_unregister_supply_alias(dev
, id
[i
]);
1783 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1786 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1787 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1788 const struct regulator_config
*config
)
1790 struct regulator_enable_gpio
*pin
;
1791 struct gpio_desc
*gpiod
;
1794 gpiod
= gpio_to_desc(config
->ena_gpio
);
1796 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1797 if (pin
->gpiod
== gpiod
) {
1798 rdev_dbg(rdev
, "GPIO %d is already used\n",
1800 goto update_ena_gpio_to_rdev
;
1804 ret
= gpio_request_one(config
->ena_gpio
,
1805 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1806 rdev_get_name(rdev
));
1810 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1812 gpio_free(config
->ena_gpio
);
1817 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1818 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1820 update_ena_gpio_to_rdev
:
1821 pin
->request_count
++;
1822 rdev
->ena_pin
= pin
;
1826 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1828 struct regulator_enable_gpio
*pin
, *n
;
1833 /* Free the GPIO only in case of no use */
1834 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1835 if (pin
->gpiod
== rdev
->ena_pin
->gpiod
) {
1836 if (pin
->request_count
<= 1) {
1837 pin
->request_count
= 0;
1838 gpiod_put(pin
->gpiod
);
1839 list_del(&pin
->list
);
1841 rdev
->ena_pin
= NULL
;
1844 pin
->request_count
--;
1851 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1852 * @rdev: regulator_dev structure
1853 * @enable: enable GPIO at initial use?
1855 * GPIO is enabled in case of initial use. (enable_count is 0)
1856 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1858 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1860 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1866 /* Enable GPIO at initial use */
1867 if (pin
->enable_count
== 0)
1868 gpiod_set_value_cansleep(pin
->gpiod
,
1869 !pin
->ena_gpio_invert
);
1871 pin
->enable_count
++;
1873 if (pin
->enable_count
> 1) {
1874 pin
->enable_count
--;
1878 /* Disable GPIO if not used */
1879 if (pin
->enable_count
<= 1) {
1880 gpiod_set_value_cansleep(pin
->gpiod
,
1881 pin
->ena_gpio_invert
);
1882 pin
->enable_count
= 0;
1890 * _regulator_enable_delay - a delay helper function
1891 * @delay: time to delay in microseconds
1893 * Delay for the requested amount of time as per the guidelines in:
1895 * Documentation/timers/timers-howto.txt
1897 * The assumption here is that regulators will never be enabled in
1898 * atomic context and therefore sleeping functions can be used.
1900 static void _regulator_enable_delay(unsigned int delay
)
1902 unsigned int ms
= delay
/ 1000;
1903 unsigned int us
= delay
% 1000;
1907 * For small enough values, handle super-millisecond
1908 * delays in the usleep_range() call below.
1917 * Give the scheduler some room to coalesce with any other
1918 * wakeup sources. For delays shorter than 10 us, don't even
1919 * bother setting up high-resolution timers and just busy-
1923 usleep_range(us
, us
+ 100);
1928 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1932 /* Query before enabling in case configuration dependent. */
1933 ret
= _regulator_get_enable_time(rdev
);
1937 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1941 trace_regulator_enable(rdev_get_name(rdev
));
1943 if (rdev
->desc
->off_on_delay
) {
1944 /* if needed, keep a distance of off_on_delay from last time
1945 * this regulator was disabled.
1947 unsigned long start_jiffy
= jiffies
;
1948 unsigned long intended
, max_delay
, remaining
;
1950 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
1951 intended
= rdev
->last_off_jiffy
+ max_delay
;
1953 if (time_before(start_jiffy
, intended
)) {
1954 /* calc remaining jiffies to deal with one-time
1956 * in case of multiple timer wrapping, either it can be
1957 * detected by out-of-range remaining, or it cannot be
1958 * detected and we gets a panelty of
1959 * _regulator_enable_delay().
1961 remaining
= intended
- start_jiffy
;
1962 if (remaining
<= max_delay
)
1963 _regulator_enable_delay(
1964 jiffies_to_usecs(remaining
));
1968 if (rdev
->ena_pin
) {
1969 if (!rdev
->ena_gpio_state
) {
1970 ret
= regulator_ena_gpio_ctrl(rdev
, true);
1973 rdev
->ena_gpio_state
= 1;
1975 } else if (rdev
->desc
->ops
->enable
) {
1976 ret
= rdev
->desc
->ops
->enable(rdev
);
1983 /* Allow the regulator to ramp; it would be useful to extend
1984 * this for bulk operations so that the regulators can ramp
1986 trace_regulator_enable_delay(rdev_get_name(rdev
));
1988 _regulator_enable_delay(delay
);
1990 trace_regulator_enable_complete(rdev_get_name(rdev
));
1995 /* locks held by regulator_enable() */
1996 static int _regulator_enable(struct regulator_dev
*rdev
)
2000 lockdep_assert_held_once(&rdev
->mutex
);
2002 /* check voltage and requested load before enabling */
2003 if (rdev
->constraints
&&
2004 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
2005 drms_uA_update(rdev
);
2007 if (rdev
->use_count
== 0) {
2008 /* The regulator may on if it's not switchable or left on */
2009 ret
= _regulator_is_enabled(rdev
);
2010 if (ret
== -EINVAL
|| ret
== 0) {
2011 if (!_regulator_can_change_status(rdev
))
2014 ret
= _regulator_do_enable(rdev
);
2018 } else if (ret
< 0) {
2019 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
2022 /* Fallthrough on positive return values - already enabled */
2031 * regulator_enable - enable regulator output
2032 * @regulator: regulator source
2034 * Request that the regulator be enabled with the regulator output at
2035 * the predefined voltage or current value. Calls to regulator_enable()
2036 * must be balanced with calls to regulator_disable().
2038 * NOTE: the output value can be set by other drivers, boot loader or may be
2039 * hardwired in the regulator.
2041 int regulator_enable(struct regulator
*regulator
)
2043 struct regulator_dev
*rdev
= regulator
->rdev
;
2046 if (regulator
->always_on
)
2050 ret
= regulator_enable(rdev
->supply
);
2055 mutex_lock(&rdev
->mutex
);
2056 ret
= _regulator_enable(rdev
);
2057 mutex_unlock(&rdev
->mutex
);
2059 if (ret
!= 0 && rdev
->supply
)
2060 regulator_disable(rdev
->supply
);
2064 EXPORT_SYMBOL_GPL(regulator_enable
);
2066 static int _regulator_do_disable(struct regulator_dev
*rdev
)
2070 trace_regulator_disable(rdev_get_name(rdev
));
2072 if (rdev
->ena_pin
) {
2073 if (rdev
->ena_gpio_state
) {
2074 ret
= regulator_ena_gpio_ctrl(rdev
, false);
2077 rdev
->ena_gpio_state
= 0;
2080 } else if (rdev
->desc
->ops
->disable
) {
2081 ret
= rdev
->desc
->ops
->disable(rdev
);
2086 /* cares about last_off_jiffy only if off_on_delay is required by
2089 if (rdev
->desc
->off_on_delay
)
2090 rdev
->last_off_jiffy
= jiffies
;
2092 trace_regulator_disable_complete(rdev_get_name(rdev
));
2097 /* locks held by regulator_disable() */
2098 static int _regulator_disable(struct regulator_dev
*rdev
)
2102 lockdep_assert_held_once(&rdev
->mutex
);
2104 if (WARN(rdev
->use_count
<= 0,
2105 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
2108 /* are we the last user and permitted to disable ? */
2109 if (rdev
->use_count
== 1 &&
2110 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
2112 /* we are last user */
2113 if (_regulator_can_change_status(rdev
)) {
2114 ret
= _notifier_call_chain(rdev
,
2115 REGULATOR_EVENT_PRE_DISABLE
,
2117 if (ret
& NOTIFY_STOP_MASK
)
2120 ret
= _regulator_do_disable(rdev
);
2122 rdev_err(rdev
, "failed to disable\n");
2123 _notifier_call_chain(rdev
,
2124 REGULATOR_EVENT_ABORT_DISABLE
,
2128 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
2132 rdev
->use_count
= 0;
2133 } else if (rdev
->use_count
> 1) {
2135 if (rdev
->constraints
&&
2136 (rdev
->constraints
->valid_ops_mask
&
2137 REGULATOR_CHANGE_DRMS
))
2138 drms_uA_update(rdev
);
2147 * regulator_disable - disable regulator output
2148 * @regulator: regulator source
2150 * Disable the regulator output voltage or current. Calls to
2151 * regulator_enable() must be balanced with calls to
2152 * regulator_disable().
2154 * NOTE: this will only disable the regulator output if no other consumer
2155 * devices have it enabled, the regulator device supports disabling and
2156 * machine constraints permit this operation.
2158 int regulator_disable(struct regulator
*regulator
)
2160 struct regulator_dev
*rdev
= regulator
->rdev
;
2163 if (regulator
->always_on
)
2166 mutex_lock(&rdev
->mutex
);
2167 ret
= _regulator_disable(rdev
);
2168 mutex_unlock(&rdev
->mutex
);
2170 if (ret
== 0 && rdev
->supply
)
2171 regulator_disable(rdev
->supply
);
2175 EXPORT_SYMBOL_GPL(regulator_disable
);
2177 /* locks held by regulator_force_disable() */
2178 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2182 lockdep_assert_held_once(&rdev
->mutex
);
2184 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2185 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2186 if (ret
& NOTIFY_STOP_MASK
)
2189 ret
= _regulator_do_disable(rdev
);
2191 rdev_err(rdev
, "failed to force disable\n");
2192 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2193 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2197 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2198 REGULATOR_EVENT_DISABLE
, NULL
);
2204 * regulator_force_disable - force disable regulator output
2205 * @regulator: regulator source
2207 * Forcibly disable the regulator output voltage or current.
2208 * NOTE: this *will* disable the regulator output even if other consumer
2209 * devices have it enabled. This should be used for situations when device
2210 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2212 int regulator_force_disable(struct regulator
*regulator
)
2214 struct regulator_dev
*rdev
= regulator
->rdev
;
2217 mutex_lock(&rdev
->mutex
);
2218 regulator
->uA_load
= 0;
2219 ret
= _regulator_force_disable(regulator
->rdev
);
2220 mutex_unlock(&rdev
->mutex
);
2223 while (rdev
->open_count
--)
2224 regulator_disable(rdev
->supply
);
2228 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2230 static void regulator_disable_work(struct work_struct
*work
)
2232 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2236 mutex_lock(&rdev
->mutex
);
2238 BUG_ON(!rdev
->deferred_disables
);
2240 count
= rdev
->deferred_disables
;
2241 rdev
->deferred_disables
= 0;
2243 for (i
= 0; i
< count
; i
++) {
2244 ret
= _regulator_disable(rdev
);
2246 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2249 mutex_unlock(&rdev
->mutex
);
2252 for (i
= 0; i
< count
; i
++) {
2253 ret
= regulator_disable(rdev
->supply
);
2256 "Supply disable failed: %d\n", ret
);
2263 * regulator_disable_deferred - disable regulator output with delay
2264 * @regulator: regulator source
2265 * @ms: miliseconds until the regulator is disabled
2267 * Execute regulator_disable() on the regulator after a delay. This
2268 * is intended for use with devices that require some time to quiesce.
2270 * NOTE: this will only disable the regulator output if no other consumer
2271 * devices have it enabled, the regulator device supports disabling and
2272 * machine constraints permit this operation.
2274 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2276 struct regulator_dev
*rdev
= regulator
->rdev
;
2279 if (regulator
->always_on
)
2283 return regulator_disable(regulator
);
2285 mutex_lock(&rdev
->mutex
);
2286 rdev
->deferred_disables
++;
2287 mutex_unlock(&rdev
->mutex
);
2289 ret
= queue_delayed_work(system_power_efficient_wq
,
2290 &rdev
->disable_work
,
2291 msecs_to_jiffies(ms
));
2297 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2299 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2301 /* A GPIO control always takes precedence */
2303 return rdev
->ena_gpio_state
;
2305 /* If we don't know then assume that the regulator is always on */
2306 if (!rdev
->desc
->ops
->is_enabled
)
2309 return rdev
->desc
->ops
->is_enabled(rdev
);
2313 * regulator_is_enabled - is the regulator output enabled
2314 * @regulator: regulator source
2316 * Returns positive if the regulator driver backing the source/client
2317 * has requested that the device be enabled, zero if it hasn't, else a
2318 * negative errno code.
2320 * Note that the device backing this regulator handle can have multiple
2321 * users, so it might be enabled even if regulator_enable() was never
2322 * called for this particular source.
2324 int regulator_is_enabled(struct regulator
*regulator
)
2328 if (regulator
->always_on
)
2331 mutex_lock(®ulator
->rdev
->mutex
);
2332 ret
= _regulator_is_enabled(regulator
->rdev
);
2333 mutex_unlock(®ulator
->rdev
->mutex
);
2337 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2340 * regulator_can_change_voltage - check if regulator can change voltage
2341 * @regulator: regulator source
2343 * Returns positive if the regulator driver backing the source/client
2344 * can change its voltage, false otherwise. Useful for detecting fixed
2345 * or dummy regulators and disabling voltage change logic in the client
2348 int regulator_can_change_voltage(struct regulator
*regulator
)
2350 struct regulator_dev
*rdev
= regulator
->rdev
;
2352 if (rdev
->constraints
&&
2353 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2354 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2357 if (rdev
->desc
->continuous_voltage_range
&&
2358 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2359 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2365 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2368 * regulator_count_voltages - count regulator_list_voltage() selectors
2369 * @regulator: regulator source
2371 * Returns number of selectors, or negative errno. Selectors are
2372 * numbered starting at zero, and typically correspond to bitfields
2373 * in hardware registers.
2375 int regulator_count_voltages(struct regulator
*regulator
)
2377 struct regulator_dev
*rdev
= regulator
->rdev
;
2379 if (rdev
->desc
->n_voltages
)
2380 return rdev
->desc
->n_voltages
;
2385 return regulator_count_voltages(rdev
->supply
);
2387 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2390 * regulator_list_voltage - enumerate supported voltages
2391 * @regulator: regulator source
2392 * @selector: identify voltage to list
2393 * Context: can sleep
2395 * Returns a voltage that can be passed to @regulator_set_voltage(),
2396 * zero if this selector code can't be used on this system, or a
2399 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2401 struct regulator_dev
*rdev
= regulator
->rdev
;
2402 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2405 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2406 return rdev
->desc
->fixed_uV
;
2408 if (ops
->list_voltage
) {
2409 if (selector
>= rdev
->desc
->n_voltages
)
2411 mutex_lock(&rdev
->mutex
);
2412 ret
= ops
->list_voltage(rdev
, selector
);
2413 mutex_unlock(&rdev
->mutex
);
2414 } else if (rdev
->supply
) {
2415 ret
= regulator_list_voltage(rdev
->supply
, selector
);
2421 if (ret
< rdev
->constraints
->min_uV
)
2423 else if (ret
> rdev
->constraints
->max_uV
)
2429 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2432 * regulator_get_regmap - get the regulator's register map
2433 * @regulator: regulator source
2435 * Returns the register map for the given regulator, or an ERR_PTR value
2436 * if the regulator doesn't use regmap.
2438 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
2440 struct regmap
*map
= regulator
->rdev
->regmap
;
2442 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
2446 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2447 * @regulator: regulator source
2448 * @vsel_reg: voltage selector register, output parameter
2449 * @vsel_mask: mask for voltage selector bitfield, output parameter
2451 * Returns the hardware register offset and bitmask used for setting the
2452 * regulator voltage. This might be useful when configuring voltage-scaling
2453 * hardware or firmware that can make I2C requests behind the kernel's back,
2456 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2457 * and 0 is returned, otherwise a negative errno is returned.
2459 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
2461 unsigned *vsel_mask
)
2463 struct regulator_dev
*rdev
= regulator
->rdev
;
2464 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2466 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2469 *vsel_reg
= rdev
->desc
->vsel_reg
;
2470 *vsel_mask
= rdev
->desc
->vsel_mask
;
2474 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
2477 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2478 * @regulator: regulator source
2479 * @selector: identify voltage to list
2481 * Converts the selector to a hardware-specific voltage selector that can be
2482 * directly written to the regulator registers. The address of the voltage
2483 * register can be determined by calling @regulator_get_hardware_vsel_register.
2485 * On error a negative errno is returned.
2487 int regulator_list_hardware_vsel(struct regulator
*regulator
,
2490 struct regulator_dev
*rdev
= regulator
->rdev
;
2491 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2493 if (selector
>= rdev
->desc
->n_voltages
)
2495 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2500 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
2503 * regulator_get_linear_step - return the voltage step size between VSEL values
2504 * @regulator: regulator source
2506 * Returns the voltage step size between VSEL values for linear
2507 * regulators, or return 0 if the regulator isn't a linear regulator.
2509 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2511 struct regulator_dev
*rdev
= regulator
->rdev
;
2513 return rdev
->desc
->uV_step
;
2515 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2518 * regulator_is_supported_voltage - check if a voltage range can be supported
2520 * @regulator: Regulator to check.
2521 * @min_uV: Minimum required voltage in uV.
2522 * @max_uV: Maximum required voltage in uV.
2524 * Returns a boolean or a negative error code.
2526 int regulator_is_supported_voltage(struct regulator
*regulator
,
2527 int min_uV
, int max_uV
)
2529 struct regulator_dev
*rdev
= regulator
->rdev
;
2530 int i
, voltages
, ret
;
2532 /* If we can't change voltage check the current voltage */
2533 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2534 ret
= regulator_get_voltage(regulator
);
2536 return min_uV
<= ret
&& ret
<= max_uV
;
2541 /* Any voltage within constrains range is fine? */
2542 if (rdev
->desc
->continuous_voltage_range
)
2543 return min_uV
>= rdev
->constraints
->min_uV
&&
2544 max_uV
<= rdev
->constraints
->max_uV
;
2546 ret
= regulator_count_voltages(regulator
);
2551 for (i
= 0; i
< voltages
; i
++) {
2552 ret
= regulator_list_voltage(regulator
, i
);
2554 if (ret
>= min_uV
&& ret
<= max_uV
)
2560 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2562 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
2563 int min_uV
, int max_uV
,
2566 struct pre_voltage_change_data data
;
2569 data
.old_uV
= _regulator_get_voltage(rdev
);
2570 data
.min_uV
= min_uV
;
2571 data
.max_uV
= max_uV
;
2572 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2574 if (ret
& NOTIFY_STOP_MASK
)
2577 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
2581 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2582 (void *)data
.old_uV
);
2587 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
2588 int uV
, unsigned selector
)
2590 struct pre_voltage_change_data data
;
2593 data
.old_uV
= _regulator_get_voltage(rdev
);
2596 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2598 if (ret
& NOTIFY_STOP_MASK
)
2601 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
2605 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2606 (void *)data
.old_uV
);
2611 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2612 int min_uV
, int max_uV
)
2617 unsigned int selector
;
2618 int old_selector
= -1;
2620 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2622 min_uV
+= rdev
->constraints
->uV_offset
;
2623 max_uV
+= rdev
->constraints
->uV_offset
;
2626 * If we can't obtain the old selector there is not enough
2627 * info to call set_voltage_time_sel().
2629 if (_regulator_is_enabled(rdev
) &&
2630 rdev
->desc
->ops
->set_voltage_time_sel
&&
2631 rdev
->desc
->ops
->get_voltage_sel
) {
2632 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2633 if (old_selector
< 0)
2634 return old_selector
;
2637 if (rdev
->desc
->ops
->set_voltage
) {
2638 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
2642 if (rdev
->desc
->ops
->list_voltage
)
2643 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2646 best_val
= _regulator_get_voltage(rdev
);
2649 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2650 if (rdev
->desc
->ops
->map_voltage
) {
2651 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2654 if (rdev
->desc
->ops
->list_voltage
==
2655 regulator_list_voltage_linear
)
2656 ret
= regulator_map_voltage_linear(rdev
,
2658 else if (rdev
->desc
->ops
->list_voltage
==
2659 regulator_list_voltage_linear_range
)
2660 ret
= regulator_map_voltage_linear_range(rdev
,
2663 ret
= regulator_map_voltage_iterate(rdev
,
2668 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2669 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2671 if (old_selector
== selector
)
2674 ret
= _regulator_call_set_voltage_sel(
2675 rdev
, best_val
, selector
);
2684 /* Call set_voltage_time_sel if successfully obtained old_selector */
2685 if (ret
== 0 && !rdev
->constraints
->ramp_disable
&& old_selector
>= 0
2686 && old_selector
!= selector
) {
2688 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2689 old_selector
, selector
);
2691 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2696 /* Insert any necessary delays */
2697 if (delay
>= 1000) {
2698 mdelay(delay
/ 1000);
2699 udelay(delay
% 1000);
2705 if (ret
== 0 && best_val
>= 0) {
2706 unsigned long data
= best_val
;
2708 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2712 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2718 * regulator_set_voltage - set regulator output voltage
2719 * @regulator: regulator source
2720 * @min_uV: Minimum required voltage in uV
2721 * @max_uV: Maximum acceptable voltage in uV
2723 * Sets a voltage regulator to the desired output voltage. This can be set
2724 * during any regulator state. IOW, regulator can be disabled or enabled.
2726 * If the regulator is enabled then the voltage will change to the new value
2727 * immediately otherwise if the regulator is disabled the regulator will
2728 * output at the new voltage when enabled.
2730 * NOTE: If the regulator is shared between several devices then the lowest
2731 * request voltage that meets the system constraints will be used.
2732 * Regulator system constraints must be set for this regulator before
2733 * calling this function otherwise this call will fail.
2735 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2737 struct regulator_dev
*rdev
= regulator
->rdev
;
2739 int old_min_uV
, old_max_uV
;
2742 mutex_lock(&rdev
->mutex
);
2744 /* If we're setting the same range as last time the change
2745 * should be a noop (some cpufreq implementations use the same
2746 * voltage for multiple frequencies, for example).
2748 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2751 /* If we're trying to set a range that overlaps the current voltage,
2752 * return successfully even though the regulator does not support
2753 * changing the voltage.
2755 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2756 current_uV
= _regulator_get_voltage(rdev
);
2757 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
2758 regulator
->min_uV
= min_uV
;
2759 regulator
->max_uV
= max_uV
;
2765 if (!rdev
->desc
->ops
->set_voltage
&&
2766 !rdev
->desc
->ops
->set_voltage_sel
) {
2771 /* constraints check */
2772 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2776 /* restore original values in case of error */
2777 old_min_uV
= regulator
->min_uV
;
2778 old_max_uV
= regulator
->max_uV
;
2779 regulator
->min_uV
= min_uV
;
2780 regulator
->max_uV
= max_uV
;
2782 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2786 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2791 mutex_unlock(&rdev
->mutex
);
2794 regulator
->min_uV
= old_min_uV
;
2795 regulator
->max_uV
= old_max_uV
;
2796 mutex_unlock(&rdev
->mutex
);
2799 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2802 * regulator_set_voltage_time - get raise/fall time
2803 * @regulator: regulator source
2804 * @old_uV: starting voltage in microvolts
2805 * @new_uV: target voltage in microvolts
2807 * Provided with the starting and ending voltage, this function attempts to
2808 * calculate the time in microseconds required to rise or fall to this new
2811 int regulator_set_voltage_time(struct regulator
*regulator
,
2812 int old_uV
, int new_uV
)
2814 struct regulator_dev
*rdev
= regulator
->rdev
;
2815 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2821 /* Currently requires operations to do this */
2822 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2823 || !rdev
->desc
->n_voltages
)
2826 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2827 /* We only look for exact voltage matches here */
2828 voltage
= regulator_list_voltage(regulator
, i
);
2833 if (voltage
== old_uV
)
2835 if (voltage
== new_uV
)
2839 if (old_sel
< 0 || new_sel
< 0)
2842 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2844 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2847 * regulator_set_voltage_time_sel - get raise/fall time
2848 * @rdev: regulator source device
2849 * @old_selector: selector for starting voltage
2850 * @new_selector: selector for target voltage
2852 * Provided with the starting and target voltage selectors, this function
2853 * returns time in microseconds required to rise or fall to this new voltage
2855 * Drivers providing ramp_delay in regulation_constraints can use this as their
2856 * set_voltage_time_sel() operation.
2858 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2859 unsigned int old_selector
,
2860 unsigned int new_selector
)
2862 unsigned int ramp_delay
= 0;
2863 int old_volt
, new_volt
;
2865 if (rdev
->constraints
->ramp_delay
)
2866 ramp_delay
= rdev
->constraints
->ramp_delay
;
2867 else if (rdev
->desc
->ramp_delay
)
2868 ramp_delay
= rdev
->desc
->ramp_delay
;
2870 if (ramp_delay
== 0) {
2871 rdev_warn(rdev
, "ramp_delay not set\n");
2876 if (!rdev
->desc
->ops
->list_voltage
)
2879 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2880 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2882 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2884 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2887 * regulator_sync_voltage - re-apply last regulator output voltage
2888 * @regulator: regulator source
2890 * Re-apply the last configured voltage. This is intended to be used
2891 * where some external control source the consumer is cooperating with
2892 * has caused the configured voltage to change.
2894 int regulator_sync_voltage(struct regulator
*regulator
)
2896 struct regulator_dev
*rdev
= regulator
->rdev
;
2897 int ret
, min_uV
, max_uV
;
2899 mutex_lock(&rdev
->mutex
);
2901 if (!rdev
->desc
->ops
->set_voltage
&&
2902 !rdev
->desc
->ops
->set_voltage_sel
) {
2907 /* This is only going to work if we've had a voltage configured. */
2908 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2913 min_uV
= regulator
->min_uV
;
2914 max_uV
= regulator
->max_uV
;
2916 /* This should be a paranoia check... */
2917 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2921 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2925 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2928 mutex_unlock(&rdev
->mutex
);
2931 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2933 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2937 if (rdev
->desc
->ops
->get_voltage_sel
) {
2938 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2941 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2942 } else if (rdev
->desc
->ops
->get_voltage
) {
2943 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2944 } else if (rdev
->desc
->ops
->list_voltage
) {
2945 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2946 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
2947 ret
= rdev
->desc
->fixed_uV
;
2948 } else if (rdev
->supply
) {
2949 ret
= regulator_get_voltage(rdev
->supply
);
2956 return ret
- rdev
->constraints
->uV_offset
;
2960 * regulator_get_voltage - get regulator output voltage
2961 * @regulator: regulator source
2963 * This returns the current regulator voltage in uV.
2965 * NOTE: If the regulator is disabled it will return the voltage value. This
2966 * function should not be used to determine regulator state.
2968 int regulator_get_voltage(struct regulator
*regulator
)
2972 mutex_lock(®ulator
->rdev
->mutex
);
2974 ret
= _regulator_get_voltage(regulator
->rdev
);
2976 mutex_unlock(®ulator
->rdev
->mutex
);
2980 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2983 * regulator_set_current_limit - set regulator output current limit
2984 * @regulator: regulator source
2985 * @min_uA: Minimum supported current in uA
2986 * @max_uA: Maximum supported current in uA
2988 * Sets current sink to the desired output current. This can be set during
2989 * any regulator state. IOW, regulator can be disabled or enabled.
2991 * If the regulator is enabled then the current will change to the new value
2992 * immediately otherwise if the regulator is disabled the regulator will
2993 * output at the new current when enabled.
2995 * NOTE: Regulator system constraints must be set for this regulator before
2996 * calling this function otherwise this call will fail.
2998 int regulator_set_current_limit(struct regulator
*regulator
,
2999 int min_uA
, int max_uA
)
3001 struct regulator_dev
*rdev
= regulator
->rdev
;
3004 mutex_lock(&rdev
->mutex
);
3007 if (!rdev
->desc
->ops
->set_current_limit
) {
3012 /* constraints check */
3013 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
3017 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
3019 mutex_unlock(&rdev
->mutex
);
3022 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
3024 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
3028 mutex_lock(&rdev
->mutex
);
3031 if (!rdev
->desc
->ops
->get_current_limit
) {
3036 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
3038 mutex_unlock(&rdev
->mutex
);
3043 * regulator_get_current_limit - get regulator output current
3044 * @regulator: regulator source
3046 * This returns the current supplied by the specified current sink in uA.
3048 * NOTE: If the regulator is disabled it will return the current value. This
3049 * function should not be used to determine regulator state.
3051 int regulator_get_current_limit(struct regulator
*regulator
)
3053 return _regulator_get_current_limit(regulator
->rdev
);
3055 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
3058 * regulator_set_mode - set regulator operating mode
3059 * @regulator: regulator source
3060 * @mode: operating mode - one of the REGULATOR_MODE constants
3062 * Set regulator operating mode to increase regulator efficiency or improve
3063 * regulation performance.
3065 * NOTE: Regulator system constraints must be set for this regulator before
3066 * calling this function otherwise this call will fail.
3068 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
3070 struct regulator_dev
*rdev
= regulator
->rdev
;
3072 int regulator_curr_mode
;
3074 mutex_lock(&rdev
->mutex
);
3077 if (!rdev
->desc
->ops
->set_mode
) {
3082 /* return if the same mode is requested */
3083 if (rdev
->desc
->ops
->get_mode
) {
3084 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
3085 if (regulator_curr_mode
== mode
) {
3091 /* constraints check */
3092 ret
= regulator_mode_constrain(rdev
, &mode
);
3096 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
3098 mutex_unlock(&rdev
->mutex
);
3101 EXPORT_SYMBOL_GPL(regulator_set_mode
);
3103 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
3107 mutex_lock(&rdev
->mutex
);
3110 if (!rdev
->desc
->ops
->get_mode
) {
3115 ret
= rdev
->desc
->ops
->get_mode(rdev
);
3117 mutex_unlock(&rdev
->mutex
);
3122 * regulator_get_mode - get regulator operating mode
3123 * @regulator: regulator source
3125 * Get the current regulator operating mode.
3127 unsigned int regulator_get_mode(struct regulator
*regulator
)
3129 return _regulator_get_mode(regulator
->rdev
);
3131 EXPORT_SYMBOL_GPL(regulator_get_mode
);
3134 * regulator_set_load - set regulator load
3135 * @regulator: regulator source
3136 * @uA_load: load current
3138 * Notifies the regulator core of a new device load. This is then used by
3139 * DRMS (if enabled by constraints) to set the most efficient regulator
3140 * operating mode for the new regulator loading.
3142 * Consumer devices notify their supply regulator of the maximum power
3143 * they will require (can be taken from device datasheet in the power
3144 * consumption tables) when they change operational status and hence power
3145 * state. Examples of operational state changes that can affect power
3146 * consumption are :-
3148 * o Device is opened / closed.
3149 * o Device I/O is about to begin or has just finished.
3150 * o Device is idling in between work.
3152 * This information is also exported via sysfs to userspace.
3154 * DRMS will sum the total requested load on the regulator and change
3155 * to the most efficient operating mode if platform constraints allow.
3157 * On error a negative errno is returned.
3159 int regulator_set_load(struct regulator
*regulator
, int uA_load
)
3161 struct regulator_dev
*rdev
= regulator
->rdev
;
3164 mutex_lock(&rdev
->mutex
);
3165 regulator
->uA_load
= uA_load
;
3166 ret
= drms_uA_update(rdev
);
3167 mutex_unlock(&rdev
->mutex
);
3171 EXPORT_SYMBOL_GPL(regulator_set_load
);
3174 * regulator_allow_bypass - allow the regulator to go into bypass mode
3176 * @regulator: Regulator to configure
3177 * @enable: enable or disable bypass mode
3179 * Allow the regulator to go into bypass mode if all other consumers
3180 * for the regulator also enable bypass mode and the machine
3181 * constraints allow this. Bypass mode means that the regulator is
3182 * simply passing the input directly to the output with no regulation.
3184 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3186 struct regulator_dev
*rdev
= regulator
->rdev
;
3189 if (!rdev
->desc
->ops
->set_bypass
)
3192 if (rdev
->constraints
&&
3193 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
3196 mutex_lock(&rdev
->mutex
);
3198 if (enable
&& !regulator
->bypass
) {
3199 rdev
->bypass_count
++;
3201 if (rdev
->bypass_count
== rdev
->open_count
) {
3202 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3204 rdev
->bypass_count
--;
3207 } else if (!enable
&& regulator
->bypass
) {
3208 rdev
->bypass_count
--;
3210 if (rdev
->bypass_count
!= rdev
->open_count
) {
3211 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3213 rdev
->bypass_count
++;
3218 regulator
->bypass
= enable
;
3220 mutex_unlock(&rdev
->mutex
);
3224 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3227 * regulator_register_notifier - register regulator event notifier
3228 * @regulator: regulator source
3229 * @nb: notifier block
3231 * Register notifier block to receive regulator events.
3233 int regulator_register_notifier(struct regulator
*regulator
,
3234 struct notifier_block
*nb
)
3236 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3239 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3242 * regulator_unregister_notifier - unregister regulator event notifier
3243 * @regulator: regulator source
3244 * @nb: notifier block
3246 * Unregister regulator event notifier block.
3248 int regulator_unregister_notifier(struct regulator
*regulator
,
3249 struct notifier_block
*nb
)
3251 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3254 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3256 /* notify regulator consumers and downstream regulator consumers.
3257 * Note mutex must be held by caller.
3259 static int _notifier_call_chain(struct regulator_dev
*rdev
,
3260 unsigned long event
, void *data
)
3262 /* call rdev chain first */
3263 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3267 * regulator_bulk_get - get multiple regulator consumers
3269 * @dev: Device to supply
3270 * @num_consumers: Number of consumers to register
3271 * @consumers: Configuration of consumers; clients are stored here.
3273 * @return 0 on success, an errno on failure.
3275 * This helper function allows drivers to get several regulator
3276 * consumers in one operation. If any of the regulators cannot be
3277 * acquired then any regulators that were allocated will be freed
3278 * before returning to the caller.
3280 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3281 struct regulator_bulk_data
*consumers
)
3286 for (i
= 0; i
< num_consumers
; i
++)
3287 consumers
[i
].consumer
= NULL
;
3289 for (i
= 0; i
< num_consumers
; i
++) {
3290 consumers
[i
].consumer
= regulator_get(dev
,
3291 consumers
[i
].supply
);
3292 if (IS_ERR(consumers
[i
].consumer
)) {
3293 ret
= PTR_ERR(consumers
[i
].consumer
);
3294 dev_err(dev
, "Failed to get supply '%s': %d\n",
3295 consumers
[i
].supply
, ret
);
3296 consumers
[i
].consumer
= NULL
;
3305 regulator_put(consumers
[i
].consumer
);
3309 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3311 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3313 struct regulator_bulk_data
*bulk
= data
;
3315 bulk
->ret
= regulator_enable(bulk
->consumer
);
3319 * regulator_bulk_enable - enable multiple regulator consumers
3321 * @num_consumers: Number of consumers
3322 * @consumers: Consumer data; clients are stored here.
3323 * @return 0 on success, an errno on failure
3325 * This convenience API allows consumers to enable multiple regulator
3326 * clients in a single API call. If any consumers cannot be enabled
3327 * then any others that were enabled will be disabled again prior to
3330 int regulator_bulk_enable(int num_consumers
,
3331 struct regulator_bulk_data
*consumers
)
3333 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3337 for (i
= 0; i
< num_consumers
; i
++) {
3338 if (consumers
[i
].consumer
->always_on
)
3339 consumers
[i
].ret
= 0;
3341 async_schedule_domain(regulator_bulk_enable_async
,
3342 &consumers
[i
], &async_domain
);
3345 async_synchronize_full_domain(&async_domain
);
3347 /* If any consumer failed we need to unwind any that succeeded */
3348 for (i
= 0; i
< num_consumers
; i
++) {
3349 if (consumers
[i
].ret
!= 0) {
3350 ret
= consumers
[i
].ret
;
3358 for (i
= 0; i
< num_consumers
; i
++) {
3359 if (consumers
[i
].ret
< 0)
3360 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3363 regulator_disable(consumers
[i
].consumer
);
3368 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3371 * regulator_bulk_disable - disable multiple regulator consumers
3373 * @num_consumers: Number of consumers
3374 * @consumers: Consumer data; clients are stored here.
3375 * @return 0 on success, an errno on failure
3377 * This convenience API allows consumers to disable multiple regulator
3378 * clients in a single API call. If any consumers cannot be disabled
3379 * then any others that were disabled will be enabled again prior to
3382 int regulator_bulk_disable(int num_consumers
,
3383 struct regulator_bulk_data
*consumers
)
3388 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3389 ret
= regulator_disable(consumers
[i
].consumer
);
3397 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3398 for (++i
; i
< num_consumers
; ++i
) {
3399 r
= regulator_enable(consumers
[i
].consumer
);
3401 pr_err("Failed to reename %s: %d\n",
3402 consumers
[i
].supply
, r
);
3407 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3410 * regulator_bulk_force_disable - force disable multiple regulator consumers
3412 * @num_consumers: Number of consumers
3413 * @consumers: Consumer data; clients are stored here.
3414 * @return 0 on success, an errno on failure
3416 * This convenience API allows consumers to forcibly disable multiple regulator
3417 * clients in a single API call.
3418 * NOTE: This should be used for situations when device damage will
3419 * likely occur if the regulators are not disabled (e.g. over temp).
3420 * Although regulator_force_disable function call for some consumers can
3421 * return error numbers, the function is called for all consumers.
3423 int regulator_bulk_force_disable(int num_consumers
,
3424 struct regulator_bulk_data
*consumers
)
3429 for (i
= 0; i
< num_consumers
; i
++)
3431 regulator_force_disable(consumers
[i
].consumer
);
3433 for (i
= 0; i
< num_consumers
; i
++) {
3434 if (consumers
[i
].ret
!= 0) {
3435 ret
= consumers
[i
].ret
;
3444 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3447 * regulator_bulk_free - free multiple regulator consumers
3449 * @num_consumers: Number of consumers
3450 * @consumers: Consumer data; clients are stored here.
3452 * This convenience API allows consumers to free multiple regulator
3453 * clients in a single API call.
3455 void regulator_bulk_free(int num_consumers
,
3456 struct regulator_bulk_data
*consumers
)
3460 for (i
= 0; i
< num_consumers
; i
++) {
3461 regulator_put(consumers
[i
].consumer
);
3462 consumers
[i
].consumer
= NULL
;
3465 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3468 * regulator_notifier_call_chain - call regulator event notifier
3469 * @rdev: regulator source
3470 * @event: notifier block
3471 * @data: callback-specific data.
3473 * Called by regulator drivers to notify clients a regulator event has
3474 * occurred. We also notify regulator clients downstream.
3475 * Note lock must be held by caller.
3477 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3478 unsigned long event
, void *data
)
3480 lockdep_assert_held_once(&rdev
->mutex
);
3482 _notifier_call_chain(rdev
, event
, data
);
3486 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3489 * regulator_mode_to_status - convert a regulator mode into a status
3491 * @mode: Mode to convert
3493 * Convert a regulator mode into a status.
3495 int regulator_mode_to_status(unsigned int mode
)
3498 case REGULATOR_MODE_FAST
:
3499 return REGULATOR_STATUS_FAST
;
3500 case REGULATOR_MODE_NORMAL
:
3501 return REGULATOR_STATUS_NORMAL
;
3502 case REGULATOR_MODE_IDLE
:
3503 return REGULATOR_STATUS_IDLE
;
3504 case REGULATOR_MODE_STANDBY
:
3505 return REGULATOR_STATUS_STANDBY
;
3507 return REGULATOR_STATUS_UNDEFINED
;
3510 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3512 static struct attribute
*regulator_dev_attrs
[] = {
3513 &dev_attr_name
.attr
,
3514 &dev_attr_num_users
.attr
,
3515 &dev_attr_type
.attr
,
3516 &dev_attr_microvolts
.attr
,
3517 &dev_attr_microamps
.attr
,
3518 &dev_attr_opmode
.attr
,
3519 &dev_attr_state
.attr
,
3520 &dev_attr_status
.attr
,
3521 &dev_attr_bypass
.attr
,
3522 &dev_attr_requested_microamps
.attr
,
3523 &dev_attr_min_microvolts
.attr
,
3524 &dev_attr_max_microvolts
.attr
,
3525 &dev_attr_min_microamps
.attr
,
3526 &dev_attr_max_microamps
.attr
,
3527 &dev_attr_suspend_standby_state
.attr
,
3528 &dev_attr_suspend_mem_state
.attr
,
3529 &dev_attr_suspend_disk_state
.attr
,
3530 &dev_attr_suspend_standby_microvolts
.attr
,
3531 &dev_attr_suspend_mem_microvolts
.attr
,
3532 &dev_attr_suspend_disk_microvolts
.attr
,
3533 &dev_attr_suspend_standby_mode
.attr
,
3534 &dev_attr_suspend_mem_mode
.attr
,
3535 &dev_attr_suspend_disk_mode
.attr
,
3540 * To avoid cluttering sysfs (and memory) with useless state, only
3541 * create attributes that can be meaningfully displayed.
3543 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
3544 struct attribute
*attr
, int idx
)
3546 struct device
*dev
= kobj_to_dev(kobj
);
3547 struct regulator_dev
*rdev
= container_of(dev
, struct regulator_dev
, dev
);
3548 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3549 umode_t mode
= attr
->mode
;
3551 /* these three are always present */
3552 if (attr
== &dev_attr_name
.attr
||
3553 attr
== &dev_attr_num_users
.attr
||
3554 attr
== &dev_attr_type
.attr
)
3557 /* some attributes need specific methods to be displayed */
3558 if (attr
== &dev_attr_microvolts
.attr
) {
3559 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3560 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3561 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3562 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
3567 if (attr
== &dev_attr_microamps
.attr
)
3568 return ops
->get_current_limit
? mode
: 0;
3570 if (attr
== &dev_attr_opmode
.attr
)
3571 return ops
->get_mode
? mode
: 0;
3573 if (attr
== &dev_attr_state
.attr
)
3574 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
3576 if (attr
== &dev_attr_status
.attr
)
3577 return ops
->get_status
? mode
: 0;
3579 if (attr
== &dev_attr_bypass
.attr
)
3580 return ops
->get_bypass
? mode
: 0;
3582 /* some attributes are type-specific */
3583 if (attr
== &dev_attr_requested_microamps
.attr
)
3584 return rdev
->desc
->type
== REGULATOR_CURRENT
? mode
: 0;
3586 /* constraints need specific supporting methods */
3587 if (attr
== &dev_attr_min_microvolts
.attr
||
3588 attr
== &dev_attr_max_microvolts
.attr
)
3589 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
3591 if (attr
== &dev_attr_min_microamps
.attr
||
3592 attr
== &dev_attr_max_microamps
.attr
)
3593 return ops
->set_current_limit
? mode
: 0;
3595 if (attr
== &dev_attr_suspend_standby_state
.attr
||
3596 attr
== &dev_attr_suspend_mem_state
.attr
||
3597 attr
== &dev_attr_suspend_disk_state
.attr
)
3600 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
3601 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
3602 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
3603 return ops
->set_suspend_voltage
? mode
: 0;
3605 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
3606 attr
== &dev_attr_suspend_mem_mode
.attr
||
3607 attr
== &dev_attr_suspend_disk_mode
.attr
)
3608 return ops
->set_suspend_mode
? mode
: 0;
3613 static const struct attribute_group regulator_dev_group
= {
3614 .attrs
= regulator_dev_attrs
,
3615 .is_visible
= regulator_attr_is_visible
,
3618 static const struct attribute_group
*regulator_dev_groups
[] = {
3619 ®ulator_dev_group
,
3623 static void regulator_dev_release(struct device
*dev
)
3625 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
3627 kfree(rdev
->constraints
);
3628 of_node_put(rdev
->dev
.of_node
);
3632 static struct class regulator_class
= {
3633 .name
= "regulator",
3634 .dev_release
= regulator_dev_release
,
3635 .dev_groups
= regulator_dev_groups
,
3638 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3640 struct device
*parent
= rdev
->dev
.parent
;
3641 const char *rname
= rdev_get_name(rdev
);
3642 char name
[NAME_MAX
];
3644 /* Avoid duplicate debugfs directory names */
3645 if (parent
&& rname
== rdev
->desc
->name
) {
3646 snprintf(name
, sizeof(name
), "%s-%s", dev_name(parent
),
3651 rdev
->debugfs
= debugfs_create_dir(rname
, debugfs_root
);
3652 if (!rdev
->debugfs
) {
3653 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3657 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3659 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3661 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3662 &rdev
->bypass_count
);
3666 * regulator_register - register regulator
3667 * @regulator_desc: regulator to register
3668 * @cfg: runtime configuration for regulator
3670 * Called by regulator drivers to register a regulator.
3671 * Returns a valid pointer to struct regulator_dev on success
3672 * or an ERR_PTR() on error.
3674 struct regulator_dev
*
3675 regulator_register(const struct regulator_desc
*regulator_desc
,
3676 const struct regulator_config
*cfg
)
3678 const struct regulation_constraints
*constraints
= NULL
;
3679 const struct regulator_init_data
*init_data
;
3680 struct regulator_config
*config
= NULL
;
3681 static atomic_t regulator_no
= ATOMIC_INIT(-1);
3682 struct regulator_dev
*rdev
;
3686 if (regulator_desc
== NULL
|| cfg
== NULL
)
3687 return ERR_PTR(-EINVAL
);
3692 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3693 return ERR_PTR(-EINVAL
);
3695 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3696 regulator_desc
->type
!= REGULATOR_CURRENT
)
3697 return ERR_PTR(-EINVAL
);
3699 /* Only one of each should be implemented */
3700 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3701 regulator_desc
->ops
->get_voltage_sel
);
3702 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3703 regulator_desc
->ops
->set_voltage_sel
);
3705 /* If we're using selectors we must implement list_voltage. */
3706 if (regulator_desc
->ops
->get_voltage_sel
&&
3707 !regulator_desc
->ops
->list_voltage
) {
3708 return ERR_PTR(-EINVAL
);
3710 if (regulator_desc
->ops
->set_voltage_sel
&&
3711 !regulator_desc
->ops
->list_voltage
) {
3712 return ERR_PTR(-EINVAL
);
3715 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3717 return ERR_PTR(-ENOMEM
);
3720 * Duplicate the config so the driver could override it after
3721 * parsing init data.
3723 config
= kmemdup(cfg
, sizeof(*cfg
), GFP_KERNEL
);
3724 if (config
== NULL
) {
3726 return ERR_PTR(-ENOMEM
);
3729 init_data
= regulator_of_get_init_data(dev
, regulator_desc
, config
,
3730 &rdev
->dev
.of_node
);
3732 init_data
= config
->init_data
;
3733 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
3736 mutex_lock(®ulator_list_mutex
);
3738 mutex_init(&rdev
->mutex
);
3739 rdev
->reg_data
= config
->driver_data
;
3740 rdev
->owner
= regulator_desc
->owner
;
3741 rdev
->desc
= regulator_desc
;
3743 rdev
->regmap
= config
->regmap
;
3744 else if (dev_get_regmap(dev
, NULL
))
3745 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3746 else if (dev
->parent
)
3747 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3748 INIT_LIST_HEAD(&rdev
->consumer_list
);
3749 INIT_LIST_HEAD(&rdev
->list
);
3750 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3751 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3753 /* preform any regulator specific init */
3754 if (init_data
&& init_data
->regulator_init
) {
3755 ret
= init_data
->regulator_init(rdev
->reg_data
);
3760 /* register with sysfs */
3761 rdev
->dev
.class = ®ulator_class
;
3762 rdev
->dev
.parent
= dev
;
3763 dev_set_name(&rdev
->dev
, "regulator.%lu",
3764 (unsigned long) atomic_inc_return(®ulator_no
));
3765 ret
= device_register(&rdev
->dev
);
3767 put_device(&rdev
->dev
);
3771 dev_set_drvdata(&rdev
->dev
, rdev
);
3773 if ((config
->ena_gpio
|| config
->ena_gpio_initialized
) &&
3774 gpio_is_valid(config
->ena_gpio
)) {
3775 ret
= regulator_ena_gpio_request(rdev
, config
);
3777 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3778 config
->ena_gpio
, ret
);
3783 /* set regulator constraints */
3785 constraints
= &init_data
->constraints
;
3787 ret
= set_machine_constraints(rdev
, constraints
);
3791 if (init_data
&& init_data
->supply_regulator
)
3792 rdev
->supply_name
= init_data
->supply_regulator
;
3793 else if (regulator_desc
->supply_name
)
3794 rdev
->supply_name
= regulator_desc
->supply_name
;
3796 /* add consumers devices */
3798 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3799 ret
= set_consumer_device_supply(rdev
,
3800 init_data
->consumer_supplies
[i
].dev_name
,
3801 init_data
->consumer_supplies
[i
].supply
);
3803 dev_err(dev
, "Failed to set supply %s\n",
3804 init_data
->consumer_supplies
[i
].supply
);
3805 goto unset_supplies
;
3810 list_add(&rdev
->list
, ®ulator_list
);
3812 rdev_init_debugfs(rdev
);
3814 mutex_unlock(®ulator_list_mutex
);
3819 unset_regulator_supplies(rdev
);
3822 regulator_ena_gpio_free(rdev
);
3823 kfree(rdev
->constraints
);
3825 device_unregister(&rdev
->dev
);
3826 /* device core frees rdev */
3827 rdev
= ERR_PTR(ret
);
3832 rdev
= ERR_PTR(ret
);
3835 EXPORT_SYMBOL_GPL(regulator_register
);
3838 * regulator_unregister - unregister regulator
3839 * @rdev: regulator to unregister
3841 * Called by regulator drivers to unregister a regulator.
3843 void regulator_unregister(struct regulator_dev
*rdev
)
3849 while (rdev
->use_count
--)
3850 regulator_disable(rdev
->supply
);
3851 regulator_put(rdev
->supply
);
3853 mutex_lock(®ulator_list_mutex
);
3854 debugfs_remove_recursive(rdev
->debugfs
);
3855 flush_work(&rdev
->disable_work
.work
);
3856 WARN_ON(rdev
->open_count
);
3857 unset_regulator_supplies(rdev
);
3858 list_del(&rdev
->list
);
3859 mutex_unlock(®ulator_list_mutex
);
3860 regulator_ena_gpio_free(rdev
);
3861 device_unregister(&rdev
->dev
);
3863 EXPORT_SYMBOL_GPL(regulator_unregister
);
3866 * regulator_suspend_prepare - prepare regulators for system wide suspend
3867 * @state: system suspend state
3869 * Configure each regulator with it's suspend operating parameters for state.
3870 * This will usually be called by machine suspend code prior to supending.
3872 int regulator_suspend_prepare(suspend_state_t state
)
3874 struct regulator_dev
*rdev
;
3877 /* ON is handled by regulator active state */
3878 if (state
== PM_SUSPEND_ON
)
3881 mutex_lock(®ulator_list_mutex
);
3882 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3884 mutex_lock(&rdev
->mutex
);
3885 ret
= suspend_prepare(rdev
, state
);
3886 mutex_unlock(&rdev
->mutex
);
3889 rdev_err(rdev
, "failed to prepare\n");
3894 mutex_unlock(®ulator_list_mutex
);
3897 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3900 * regulator_suspend_finish - resume regulators from system wide suspend
3902 * Turn on regulators that might be turned off by regulator_suspend_prepare
3903 * and that should be turned on according to the regulators properties.
3905 int regulator_suspend_finish(void)
3907 struct regulator_dev
*rdev
;
3910 mutex_lock(®ulator_list_mutex
);
3911 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3912 mutex_lock(&rdev
->mutex
);
3913 if (rdev
->use_count
> 0 || rdev
->constraints
->always_on
) {
3914 if (!_regulator_is_enabled(rdev
)) {
3915 error
= _regulator_do_enable(rdev
);
3920 if (!have_full_constraints())
3922 if (!_regulator_is_enabled(rdev
))
3925 error
= _regulator_do_disable(rdev
);
3930 mutex_unlock(&rdev
->mutex
);
3932 mutex_unlock(®ulator_list_mutex
);
3935 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3938 * regulator_has_full_constraints - the system has fully specified constraints
3940 * Calling this function will cause the regulator API to disable all
3941 * regulators which have a zero use count and don't have an always_on
3942 * constraint in a late_initcall.
3944 * The intention is that this will become the default behaviour in a
3945 * future kernel release so users are encouraged to use this facility
3948 void regulator_has_full_constraints(void)
3950 has_full_constraints
= 1;
3952 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3955 * rdev_get_drvdata - get rdev regulator driver data
3958 * Get rdev regulator driver private data. This call can be used in the
3959 * regulator driver context.
3961 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3963 return rdev
->reg_data
;
3965 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3968 * regulator_get_drvdata - get regulator driver data
3969 * @regulator: regulator
3971 * Get regulator driver private data. This call can be used in the consumer
3972 * driver context when non API regulator specific functions need to be called.
3974 void *regulator_get_drvdata(struct regulator
*regulator
)
3976 return regulator
->rdev
->reg_data
;
3978 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3981 * regulator_set_drvdata - set regulator driver data
3982 * @regulator: regulator
3985 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3987 regulator
->rdev
->reg_data
= data
;
3989 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3992 * regulator_get_id - get regulator ID
3995 int rdev_get_id(struct regulator_dev
*rdev
)
3997 return rdev
->desc
->id
;
3999 EXPORT_SYMBOL_GPL(rdev_get_id
);
4001 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
4005 EXPORT_SYMBOL_GPL(rdev_get_dev
);
4007 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
4009 return reg_init_data
->driver_data
;
4011 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
4013 #ifdef CONFIG_DEBUG_FS
4014 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
4015 size_t count
, loff_t
*ppos
)
4017 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
4018 ssize_t len
, ret
= 0;
4019 struct regulator_map
*map
;
4024 list_for_each_entry(map
, ®ulator_map_list
, list
) {
4025 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
4027 rdev_get_name(map
->regulator
), map
->dev_name
,
4031 if (ret
> PAGE_SIZE
) {
4037 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
4045 static const struct file_operations supply_map_fops
= {
4046 #ifdef CONFIG_DEBUG_FS
4047 .read
= supply_map_read_file
,
4048 .llseek
= default_llseek
,
4052 #ifdef CONFIG_DEBUG_FS
4053 static void regulator_summary_show_subtree(struct seq_file
*s
,
4054 struct regulator_dev
*rdev
,
4057 struct list_head
*list
= s
->private;
4058 struct regulator_dev
*child
;
4059 struct regulation_constraints
*c
;
4060 struct regulator
*consumer
;
4065 seq_printf(s
, "%*s%-*s %3d %4d %6d ",
4067 30 - level
* 3, rdev_get_name(rdev
),
4068 rdev
->use_count
, rdev
->open_count
, rdev
->bypass_count
);
4070 seq_printf(s
, "%5dmV ", _regulator_get_voltage(rdev
) / 1000);
4071 seq_printf(s
, "%5dmA ", _regulator_get_current_limit(rdev
) / 1000);
4073 c
= rdev
->constraints
;
4075 switch (rdev
->desc
->type
) {
4076 case REGULATOR_VOLTAGE
:
4077 seq_printf(s
, "%5dmV %5dmV ",
4078 c
->min_uV
/ 1000, c
->max_uV
/ 1000);
4080 case REGULATOR_CURRENT
:
4081 seq_printf(s
, "%5dmA %5dmA ",
4082 c
->min_uA
/ 1000, c
->max_uA
/ 1000);
4089 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
) {
4090 if (consumer
->dev
->class == ®ulator_class
)
4093 seq_printf(s
, "%*s%-*s ",
4094 (level
+ 1) * 3 + 1, "",
4095 30 - (level
+ 1) * 3, dev_name(consumer
->dev
));
4097 switch (rdev
->desc
->type
) {
4098 case REGULATOR_VOLTAGE
:
4099 seq_printf(s
, "%37dmV %5dmV",
4100 consumer
->min_uV
/ 1000,
4101 consumer
->max_uV
/ 1000);
4103 case REGULATOR_CURRENT
:
4110 list_for_each_entry(child
, list
, list
) {
4111 /* handle only non-root regulators supplied by current rdev */
4112 if (!child
->supply
|| child
->supply
->rdev
!= rdev
)
4115 regulator_summary_show_subtree(s
, child
, level
+ 1);
4119 static int regulator_summary_show(struct seq_file
*s
, void *data
)
4121 struct list_head
*list
= s
->private;
4122 struct regulator_dev
*rdev
;
4124 seq_puts(s
, " regulator use open bypass voltage current min max\n");
4125 seq_puts(s
, "-------------------------------------------------------------------------------\n");
4127 mutex_lock(®ulator_list_mutex
);
4129 list_for_each_entry(rdev
, list
, list
) {
4133 regulator_summary_show_subtree(s
, rdev
, 0);
4136 mutex_unlock(®ulator_list_mutex
);
4141 static int regulator_summary_open(struct inode
*inode
, struct file
*file
)
4143 return single_open(file
, regulator_summary_show
, inode
->i_private
);
4147 static const struct file_operations regulator_summary_fops
= {
4148 #ifdef CONFIG_DEBUG_FS
4149 .open
= regulator_summary_open
,
4151 .llseek
= seq_lseek
,
4152 .release
= single_release
,
4156 static int __init
regulator_init(void)
4160 ret
= class_register(®ulator_class
);
4162 debugfs_root
= debugfs_create_dir("regulator", NULL
);
4164 pr_warn("regulator: Failed to create debugfs directory\n");
4166 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
4169 debugfs_create_file("regulator_summary", 0444, debugfs_root
,
4170 ®ulator_list
, ®ulator_summary_fops
);
4172 regulator_dummy_init();
4177 /* init early to allow our consumers to complete system booting */
4178 core_initcall(regulator_init
);
4180 static int __init
regulator_late_cleanup(struct device
*dev
, void *data
)
4182 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4183 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
4184 struct regulation_constraints
*c
= rdev
->constraints
;
4187 if (c
&& c
->always_on
)
4190 if (c
&& !(c
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
))
4193 mutex_lock(&rdev
->mutex
);
4195 if (rdev
->use_count
)
4198 /* If we can't read the status assume it's on. */
4199 if (ops
->is_enabled
)
4200 enabled
= ops
->is_enabled(rdev
);
4207 if (have_full_constraints()) {
4208 /* We log since this may kill the system if it goes
4210 rdev_info(rdev
, "disabling\n");
4211 ret
= _regulator_do_disable(rdev
);
4213 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4215 /* The intention is that in future we will
4216 * assume that full constraints are provided
4217 * so warn even if we aren't going to do
4220 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4224 mutex_unlock(&rdev
->mutex
);
4229 static int __init
regulator_init_complete(void)
4232 * Since DT doesn't provide an idiomatic mechanism for
4233 * enabling full constraints and since it's much more natural
4234 * with DT to provide them just assume that a DT enabled
4235 * system has full constraints.
4237 if (of_have_populated_dt())
4238 has_full_constraints
= true;
4240 /* If we have a full configuration then disable any regulators
4241 * we have permission to change the status for and which are
4242 * not in use or always_on. This is effectively the default
4243 * for DT and ACPI as they have full constraints.
4245 class_for_each_device(®ulator_class
, NULL
, NULL
,
4246 regulator_late_cleanup
);
4250 late_initcall_sync(regulator_init_complete
);