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_map_list
);
55 static LIST_HEAD(regulator_ena_gpio_list
);
56 static LIST_HEAD(regulator_supply_alias_list
);
57 static bool has_full_constraints
;
59 static struct dentry
*debugfs_root
;
62 * struct regulator_map
64 * Used to provide symbolic supply names to devices.
66 struct regulator_map
{
67 struct list_head list
;
68 const char *dev_name
; /* The dev_name() for the consumer */
70 struct regulator_dev
*regulator
;
74 * struct regulator_enable_gpio
76 * Management for shared enable GPIO pin
78 struct regulator_enable_gpio
{
79 struct list_head list
;
80 struct gpio_desc
*gpiod
;
81 u32 enable_count
; /* a number of enabled shared GPIO */
82 u32 request_count
; /* a number of requested shared GPIO */
83 unsigned int ena_gpio_invert
:1;
87 * struct regulator_supply_alias
89 * Used to map lookups for a supply onto an alternative device.
91 struct regulator_supply_alias
{
92 struct list_head list
;
93 struct device
*src_dev
;
94 const char *src_supply
;
95 struct device
*alias_dev
;
96 const char *alias_supply
;
99 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
100 static int _regulator_disable(struct regulator_dev
*rdev
);
101 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
102 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
103 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
104 static int _notifier_call_chain(struct regulator_dev
*rdev
,
105 unsigned long event
, void *data
);
106 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
107 int min_uV
, int max_uV
);
108 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
110 const char *supply_name
);
111 static void _regulator_put(struct regulator
*regulator
);
113 static const char *rdev_get_name(struct regulator_dev
*rdev
)
115 if (rdev
->constraints
&& rdev
->constraints
->name
)
116 return rdev
->constraints
->name
;
117 else if (rdev
->desc
->name
)
118 return rdev
->desc
->name
;
123 static bool have_full_constraints(void)
125 return has_full_constraints
|| of_have_populated_dt();
128 static bool regulator_ops_is_valid(struct regulator_dev
*rdev
, int ops
)
130 if (!rdev
->constraints
) {
131 rdev_err(rdev
, "no constraints\n");
135 if (rdev
->constraints
->valid_ops_mask
& ops
)
141 static inline struct regulator_dev
*rdev_get_supply(struct regulator_dev
*rdev
)
143 if (rdev
&& rdev
->supply
)
144 return rdev
->supply
->rdev
;
150 * regulator_lock_nested - lock a single regulator
151 * @rdev: regulator source
152 * @subclass: mutex subclass used for lockdep
154 * This function can be called many times by one task on
155 * a single regulator and its mutex will be locked only
156 * once. If a task, which is calling this function is other
157 * than the one, which initially locked the mutex, it will
160 static void regulator_lock_nested(struct regulator_dev
*rdev
,
161 unsigned int subclass
)
163 if (!mutex_trylock(&rdev
->mutex
)) {
164 if (rdev
->mutex_owner
== current
) {
168 mutex_lock_nested(&rdev
->mutex
, subclass
);
172 rdev
->mutex_owner
= current
;
175 static inline void regulator_lock(struct regulator_dev
*rdev
)
177 regulator_lock_nested(rdev
, 0);
181 * regulator_unlock - unlock a single regulator
182 * @rdev: regulator_source
184 * This function unlocks the mutex when the
185 * reference counter reaches 0.
187 static void regulator_unlock(struct regulator_dev
*rdev
)
189 if (rdev
->ref_cnt
!= 0) {
192 if (!rdev
->ref_cnt
) {
193 rdev
->mutex_owner
= NULL
;
194 mutex_unlock(&rdev
->mutex
);
200 * regulator_lock_supply - lock a regulator and its supplies
201 * @rdev: regulator source
203 static void regulator_lock_supply(struct regulator_dev
*rdev
)
207 for (i
= 0; rdev
; rdev
= rdev_get_supply(rdev
), i
++)
208 regulator_lock_nested(rdev
, i
);
212 * regulator_unlock_supply - unlock a regulator and its supplies
213 * @rdev: regulator source
215 static void regulator_unlock_supply(struct regulator_dev
*rdev
)
217 struct regulator
*supply
;
220 regulator_unlock(rdev
);
221 supply
= rdev
->supply
;
231 * of_get_regulator - get a regulator device node based on supply name
232 * @dev: Device pointer for the consumer (of regulator) device
233 * @supply: regulator supply name
235 * Extract the regulator device node corresponding to the supply name.
236 * returns the device node corresponding to the regulator if found, else
239 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
241 struct device_node
*regnode
= NULL
;
242 char prop_name
[32]; /* 32 is max size of property name */
244 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
246 snprintf(prop_name
, 32, "%s-supply", supply
);
247 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
250 dev_dbg(dev
, "Looking up %s property in node %pOF failed\n",
251 prop_name
, dev
->of_node
);
257 /* Platform voltage constraint check */
258 static int regulator_check_voltage(struct regulator_dev
*rdev
,
259 int *min_uV
, int *max_uV
)
261 BUG_ON(*min_uV
> *max_uV
);
263 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
264 rdev_err(rdev
, "voltage operation not allowed\n");
268 if (*max_uV
> rdev
->constraints
->max_uV
)
269 *max_uV
= rdev
->constraints
->max_uV
;
270 if (*min_uV
< rdev
->constraints
->min_uV
)
271 *min_uV
= rdev
->constraints
->min_uV
;
273 if (*min_uV
> *max_uV
) {
274 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
282 /* return 0 if the state is valid */
283 static int regulator_check_states(suspend_state_t state
)
285 return (state
> PM_SUSPEND_MAX
|| state
== PM_SUSPEND_TO_IDLE
);
288 /* Make sure we select a voltage that suits the needs of all
289 * regulator consumers
291 static int regulator_check_consumers(struct regulator_dev
*rdev
,
292 int *min_uV
, int *max_uV
,
293 suspend_state_t state
)
295 struct regulator
*regulator
;
296 struct regulator_voltage
*voltage
;
298 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
299 voltage
= ®ulator
->voltage
[state
];
301 * Assume consumers that didn't say anything are OK
302 * with anything in the constraint range.
304 if (!voltage
->min_uV
&& !voltage
->max_uV
)
307 if (*max_uV
> voltage
->max_uV
)
308 *max_uV
= voltage
->max_uV
;
309 if (*min_uV
< voltage
->min_uV
)
310 *min_uV
= voltage
->min_uV
;
313 if (*min_uV
> *max_uV
) {
314 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
322 /* current constraint check */
323 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
324 int *min_uA
, int *max_uA
)
326 BUG_ON(*min_uA
> *max_uA
);
328 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_CURRENT
)) {
329 rdev_err(rdev
, "current operation not allowed\n");
333 if (*max_uA
> rdev
->constraints
->max_uA
)
334 *max_uA
= rdev
->constraints
->max_uA
;
335 if (*min_uA
< rdev
->constraints
->min_uA
)
336 *min_uA
= rdev
->constraints
->min_uA
;
338 if (*min_uA
> *max_uA
) {
339 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
347 /* operating mode constraint check */
348 static int regulator_mode_constrain(struct regulator_dev
*rdev
,
352 case REGULATOR_MODE_FAST
:
353 case REGULATOR_MODE_NORMAL
:
354 case REGULATOR_MODE_IDLE
:
355 case REGULATOR_MODE_STANDBY
:
358 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
362 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_MODE
)) {
363 rdev_err(rdev
, "mode operation not allowed\n");
367 /* The modes are bitmasks, the most power hungry modes having
368 * the lowest values. If the requested mode isn't supported
369 * try higher modes. */
371 if (rdev
->constraints
->valid_modes_mask
& *mode
)
379 static inline struct regulator_state
*
380 regulator_get_suspend_state(struct regulator_dev
*rdev
, suspend_state_t state
)
382 if (rdev
->constraints
== NULL
)
386 case PM_SUSPEND_STANDBY
:
387 return &rdev
->constraints
->state_standby
;
389 return &rdev
->constraints
->state_mem
;
391 return &rdev
->constraints
->state_disk
;
397 static ssize_t
regulator_uV_show(struct device
*dev
,
398 struct device_attribute
*attr
, char *buf
)
400 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
403 regulator_lock(rdev
);
404 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
405 regulator_unlock(rdev
);
409 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
411 static ssize_t
regulator_uA_show(struct device
*dev
,
412 struct device_attribute
*attr
, char *buf
)
414 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
416 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
418 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
420 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
423 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
425 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
427 static DEVICE_ATTR_RO(name
);
429 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
432 case REGULATOR_MODE_FAST
:
433 return sprintf(buf
, "fast\n");
434 case REGULATOR_MODE_NORMAL
:
435 return sprintf(buf
, "normal\n");
436 case REGULATOR_MODE_IDLE
:
437 return sprintf(buf
, "idle\n");
438 case REGULATOR_MODE_STANDBY
:
439 return sprintf(buf
, "standby\n");
441 return sprintf(buf
, "unknown\n");
444 static ssize_t
regulator_opmode_show(struct device
*dev
,
445 struct device_attribute
*attr
, char *buf
)
447 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
449 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
451 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
453 static ssize_t
regulator_print_state(char *buf
, int state
)
456 return sprintf(buf
, "enabled\n");
458 return sprintf(buf
, "disabled\n");
460 return sprintf(buf
, "unknown\n");
463 static ssize_t
regulator_state_show(struct device
*dev
,
464 struct device_attribute
*attr
, char *buf
)
466 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
469 regulator_lock(rdev
);
470 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
471 regulator_unlock(rdev
);
475 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
477 static ssize_t
regulator_status_show(struct device
*dev
,
478 struct device_attribute
*attr
, char *buf
)
480 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
484 status
= rdev
->desc
->ops
->get_status(rdev
);
489 case REGULATOR_STATUS_OFF
:
492 case REGULATOR_STATUS_ON
:
495 case REGULATOR_STATUS_ERROR
:
498 case REGULATOR_STATUS_FAST
:
501 case REGULATOR_STATUS_NORMAL
:
504 case REGULATOR_STATUS_IDLE
:
507 case REGULATOR_STATUS_STANDBY
:
510 case REGULATOR_STATUS_BYPASS
:
513 case REGULATOR_STATUS_UNDEFINED
:
520 return sprintf(buf
, "%s\n", label
);
522 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
524 static ssize_t
regulator_min_uA_show(struct device
*dev
,
525 struct device_attribute
*attr
, char *buf
)
527 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
529 if (!rdev
->constraints
)
530 return sprintf(buf
, "constraint not defined\n");
532 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
534 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
536 static ssize_t
regulator_max_uA_show(struct device
*dev
,
537 struct device_attribute
*attr
, char *buf
)
539 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
541 if (!rdev
->constraints
)
542 return sprintf(buf
, "constraint not defined\n");
544 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
546 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
548 static ssize_t
regulator_min_uV_show(struct device
*dev
,
549 struct device_attribute
*attr
, char *buf
)
551 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
553 if (!rdev
->constraints
)
554 return sprintf(buf
, "constraint not defined\n");
556 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
558 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
560 static ssize_t
regulator_max_uV_show(struct device
*dev
,
561 struct device_attribute
*attr
, char *buf
)
563 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
565 if (!rdev
->constraints
)
566 return sprintf(buf
, "constraint not defined\n");
568 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
570 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
572 static ssize_t
regulator_total_uA_show(struct device
*dev
,
573 struct device_attribute
*attr
, char *buf
)
575 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
576 struct regulator
*regulator
;
579 regulator_lock(rdev
);
580 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
581 uA
+= regulator
->uA_load
;
582 regulator_unlock(rdev
);
583 return sprintf(buf
, "%d\n", uA
);
585 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
587 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
590 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
591 return sprintf(buf
, "%d\n", rdev
->use_count
);
593 static DEVICE_ATTR_RO(num_users
);
595 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
598 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
600 switch (rdev
->desc
->type
) {
601 case REGULATOR_VOLTAGE
:
602 return sprintf(buf
, "voltage\n");
603 case REGULATOR_CURRENT
:
604 return sprintf(buf
, "current\n");
606 return sprintf(buf
, "unknown\n");
608 static DEVICE_ATTR_RO(type
);
610 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
611 struct device_attribute
*attr
, char *buf
)
613 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
615 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
617 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
618 regulator_suspend_mem_uV_show
, NULL
);
620 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
621 struct device_attribute
*attr
, char *buf
)
623 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
625 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
627 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
628 regulator_suspend_disk_uV_show
, NULL
);
630 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
631 struct device_attribute
*attr
, char *buf
)
633 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
635 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
637 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
638 regulator_suspend_standby_uV_show
, NULL
);
640 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
641 struct device_attribute
*attr
, char *buf
)
643 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
645 return regulator_print_opmode(buf
,
646 rdev
->constraints
->state_mem
.mode
);
648 static DEVICE_ATTR(suspend_mem_mode
, 0444,
649 regulator_suspend_mem_mode_show
, NULL
);
651 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
652 struct device_attribute
*attr
, char *buf
)
654 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
656 return regulator_print_opmode(buf
,
657 rdev
->constraints
->state_disk
.mode
);
659 static DEVICE_ATTR(suspend_disk_mode
, 0444,
660 regulator_suspend_disk_mode_show
, NULL
);
662 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
663 struct device_attribute
*attr
, char *buf
)
665 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
667 return regulator_print_opmode(buf
,
668 rdev
->constraints
->state_standby
.mode
);
670 static DEVICE_ATTR(suspend_standby_mode
, 0444,
671 regulator_suspend_standby_mode_show
, NULL
);
673 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
674 struct device_attribute
*attr
, char *buf
)
676 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
678 return regulator_print_state(buf
,
679 rdev
->constraints
->state_mem
.enabled
);
681 static DEVICE_ATTR(suspend_mem_state
, 0444,
682 regulator_suspend_mem_state_show
, NULL
);
684 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
685 struct device_attribute
*attr
, char *buf
)
687 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
689 return regulator_print_state(buf
,
690 rdev
->constraints
->state_disk
.enabled
);
692 static DEVICE_ATTR(suspend_disk_state
, 0444,
693 regulator_suspend_disk_state_show
, NULL
);
695 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
696 struct device_attribute
*attr
, char *buf
)
698 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
700 return regulator_print_state(buf
,
701 rdev
->constraints
->state_standby
.enabled
);
703 static DEVICE_ATTR(suspend_standby_state
, 0444,
704 regulator_suspend_standby_state_show
, NULL
);
706 static ssize_t
regulator_bypass_show(struct device
*dev
,
707 struct device_attribute
*attr
, char *buf
)
709 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
714 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
723 return sprintf(buf
, "%s\n", report
);
725 static DEVICE_ATTR(bypass
, 0444,
726 regulator_bypass_show
, NULL
);
728 /* Calculate the new optimum regulator operating mode based on the new total
729 * consumer load. All locks held by caller */
730 static int drms_uA_update(struct regulator_dev
*rdev
)
732 struct regulator
*sibling
;
733 int current_uA
= 0, output_uV
, input_uV
, err
;
736 lockdep_assert_held_once(&rdev
->mutex
);
739 * first check to see if we can set modes at all, otherwise just
740 * tell the consumer everything is OK.
742 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_DRMS
))
745 if (!rdev
->desc
->ops
->get_optimum_mode
&&
746 !rdev
->desc
->ops
->set_load
)
749 if (!rdev
->desc
->ops
->set_mode
&&
750 !rdev
->desc
->ops
->set_load
)
753 /* calc total requested load */
754 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
755 current_uA
+= sibling
->uA_load
;
757 current_uA
+= rdev
->constraints
->system_load
;
759 if (rdev
->desc
->ops
->set_load
) {
760 /* set the optimum mode for our new total regulator load */
761 err
= rdev
->desc
->ops
->set_load(rdev
, current_uA
);
763 rdev_err(rdev
, "failed to set load %d\n", current_uA
);
765 /* get output voltage */
766 output_uV
= _regulator_get_voltage(rdev
);
767 if (output_uV
<= 0) {
768 rdev_err(rdev
, "invalid output voltage found\n");
772 /* get input voltage */
775 input_uV
= regulator_get_voltage(rdev
->supply
);
777 input_uV
= rdev
->constraints
->input_uV
;
779 rdev_err(rdev
, "invalid input voltage found\n");
783 /* now get the optimum mode for our new total regulator load */
784 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
785 output_uV
, current_uA
);
787 /* check the new mode is allowed */
788 err
= regulator_mode_constrain(rdev
, &mode
);
790 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
791 current_uA
, input_uV
, output_uV
);
795 err
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
797 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
803 static int suspend_set_state(struct regulator_dev
*rdev
,
804 suspend_state_t state
)
807 struct regulator_state
*rstate
;
809 rstate
= regulator_get_suspend_state(rdev
, state
);
813 /* If we have no suspend mode configration don't set anything;
814 * only warn if the driver implements set_suspend_voltage or
815 * set_suspend_mode callback.
817 if (rstate
->enabled
!= ENABLE_IN_SUSPEND
&&
818 rstate
->enabled
!= DISABLE_IN_SUSPEND
) {
819 if (rdev
->desc
->ops
->set_suspend_voltage
||
820 rdev
->desc
->ops
->set_suspend_mode
)
821 rdev_warn(rdev
, "No configuration\n");
825 if (rstate
->enabled
== ENABLE_IN_SUSPEND
&&
826 rdev
->desc
->ops
->set_suspend_enable
)
827 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
828 else if (rstate
->enabled
== DISABLE_IN_SUSPEND
&&
829 rdev
->desc
->ops
->set_suspend_disable
)
830 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
831 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
835 rdev_err(rdev
, "failed to enabled/disable\n");
839 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
840 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
842 rdev_err(rdev
, "failed to set voltage\n");
847 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
848 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
850 rdev_err(rdev
, "failed to set mode\n");
858 static void print_constraints(struct regulator_dev
*rdev
)
860 struct regulation_constraints
*constraints
= rdev
->constraints
;
862 size_t len
= sizeof(buf
) - 1;
866 if (constraints
->min_uV
&& constraints
->max_uV
) {
867 if (constraints
->min_uV
== constraints
->max_uV
)
868 count
+= scnprintf(buf
+ count
, len
- count
, "%d mV ",
869 constraints
->min_uV
/ 1000);
871 count
+= scnprintf(buf
+ count
, len
- count
,
873 constraints
->min_uV
/ 1000,
874 constraints
->max_uV
/ 1000);
877 if (!constraints
->min_uV
||
878 constraints
->min_uV
!= constraints
->max_uV
) {
879 ret
= _regulator_get_voltage(rdev
);
881 count
+= scnprintf(buf
+ count
, len
- count
,
882 "at %d mV ", ret
/ 1000);
885 if (constraints
->uV_offset
)
886 count
+= scnprintf(buf
+ count
, len
- count
, "%dmV offset ",
887 constraints
->uV_offset
/ 1000);
889 if (constraints
->min_uA
&& constraints
->max_uA
) {
890 if (constraints
->min_uA
== constraints
->max_uA
)
891 count
+= scnprintf(buf
+ count
, len
- count
, "%d mA ",
892 constraints
->min_uA
/ 1000);
894 count
+= scnprintf(buf
+ count
, len
- count
,
896 constraints
->min_uA
/ 1000,
897 constraints
->max_uA
/ 1000);
900 if (!constraints
->min_uA
||
901 constraints
->min_uA
!= constraints
->max_uA
) {
902 ret
= _regulator_get_current_limit(rdev
);
904 count
+= scnprintf(buf
+ count
, len
- count
,
905 "at %d mA ", ret
/ 1000);
908 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
909 count
+= scnprintf(buf
+ count
, len
- count
, "fast ");
910 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
911 count
+= scnprintf(buf
+ count
, len
- count
, "normal ");
912 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
913 count
+= scnprintf(buf
+ count
, len
- count
, "idle ");
914 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
915 count
+= scnprintf(buf
+ count
, len
- count
, "standby");
918 scnprintf(buf
, len
, "no parameters");
920 rdev_dbg(rdev
, "%s\n", buf
);
922 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
923 !regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
))
925 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
928 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
929 struct regulation_constraints
*constraints
)
931 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
934 /* do we need to apply the constraint voltage */
935 if (rdev
->constraints
->apply_uV
&&
936 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
) {
937 int target_min
, target_max
;
938 int current_uV
= _regulator_get_voltage(rdev
);
940 if (current_uV
== -ENOTRECOVERABLE
) {
941 /* This regulator can't be read and must be initted */
942 rdev_info(rdev
, "Setting %d-%duV\n",
943 rdev
->constraints
->min_uV
,
944 rdev
->constraints
->max_uV
);
945 _regulator_do_set_voltage(rdev
,
946 rdev
->constraints
->min_uV
,
947 rdev
->constraints
->max_uV
);
948 current_uV
= _regulator_get_voltage(rdev
);
951 if (current_uV
< 0) {
953 "failed to get the current voltage(%d)\n",
959 * If we're below the minimum voltage move up to the
960 * minimum voltage, if we're above the maximum voltage
961 * then move down to the maximum.
963 target_min
= current_uV
;
964 target_max
= current_uV
;
966 if (current_uV
< rdev
->constraints
->min_uV
) {
967 target_min
= rdev
->constraints
->min_uV
;
968 target_max
= rdev
->constraints
->min_uV
;
971 if (current_uV
> rdev
->constraints
->max_uV
) {
972 target_min
= rdev
->constraints
->max_uV
;
973 target_max
= rdev
->constraints
->max_uV
;
976 if (target_min
!= current_uV
|| target_max
!= current_uV
) {
977 rdev_info(rdev
, "Bringing %duV into %d-%duV\n",
978 current_uV
, target_min
, target_max
);
979 ret
= _regulator_do_set_voltage(
980 rdev
, target_min
, target_max
);
983 "failed to apply %d-%duV constraint(%d)\n",
984 target_min
, target_max
, ret
);
990 /* constrain machine-level voltage specs to fit
991 * the actual range supported by this regulator.
993 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
994 int count
= rdev
->desc
->n_voltages
;
996 int min_uV
= INT_MAX
;
997 int max_uV
= INT_MIN
;
998 int cmin
= constraints
->min_uV
;
999 int cmax
= constraints
->max_uV
;
1001 /* it's safe to autoconfigure fixed-voltage supplies
1002 and the constraints are used by list_voltage. */
1003 if (count
== 1 && !cmin
) {
1006 constraints
->min_uV
= cmin
;
1007 constraints
->max_uV
= cmax
;
1010 /* voltage constraints are optional */
1011 if ((cmin
== 0) && (cmax
== 0))
1014 /* else require explicit machine-level constraints */
1015 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
1016 rdev_err(rdev
, "invalid voltage constraints\n");
1020 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
1021 for (i
= 0; i
< count
; i
++) {
1024 value
= ops
->list_voltage(rdev
, i
);
1028 /* maybe adjust [min_uV..max_uV] */
1029 if (value
>= cmin
&& value
< min_uV
)
1031 if (value
<= cmax
&& value
> max_uV
)
1035 /* final: [min_uV..max_uV] valid iff constraints valid */
1036 if (max_uV
< min_uV
) {
1038 "unsupportable voltage constraints %u-%uuV\n",
1043 /* use regulator's subset of machine constraints */
1044 if (constraints
->min_uV
< min_uV
) {
1045 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
1046 constraints
->min_uV
, min_uV
);
1047 constraints
->min_uV
= min_uV
;
1049 if (constraints
->max_uV
> max_uV
) {
1050 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
1051 constraints
->max_uV
, max_uV
);
1052 constraints
->max_uV
= max_uV
;
1059 static int machine_constraints_current(struct regulator_dev
*rdev
,
1060 struct regulation_constraints
*constraints
)
1062 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1065 if (!constraints
->min_uA
&& !constraints
->max_uA
)
1068 if (constraints
->min_uA
> constraints
->max_uA
) {
1069 rdev_err(rdev
, "Invalid current constraints\n");
1073 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
1074 rdev_warn(rdev
, "Operation of current configuration missing\n");
1078 /* Set regulator current in constraints range */
1079 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
1080 constraints
->max_uA
);
1082 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
1089 static int _regulator_do_enable(struct regulator_dev
*rdev
);
1092 * set_machine_constraints - sets regulator constraints
1093 * @rdev: regulator source
1094 * @constraints: constraints to apply
1096 * Allows platform initialisation code to define and constrain
1097 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1098 * Constraints *must* be set by platform code in order for some
1099 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1102 static int set_machine_constraints(struct regulator_dev
*rdev
,
1103 const struct regulation_constraints
*constraints
)
1106 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1109 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
1112 rdev
->constraints
= kzalloc(sizeof(*constraints
),
1114 if (!rdev
->constraints
)
1117 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
1121 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
1125 if (rdev
->constraints
->ilim_uA
&& ops
->set_input_current_limit
) {
1126 ret
= ops
->set_input_current_limit(rdev
,
1127 rdev
->constraints
->ilim_uA
);
1129 rdev_err(rdev
, "failed to set input limit\n");
1134 /* do we need to setup our suspend state */
1135 if (rdev
->constraints
->initial_state
) {
1136 ret
= suspend_set_state(rdev
, rdev
->constraints
->initial_state
);
1138 rdev_err(rdev
, "failed to set suspend state\n");
1143 if (rdev
->constraints
->initial_mode
) {
1144 if (!ops
->set_mode
) {
1145 rdev_err(rdev
, "no set_mode operation\n");
1149 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1151 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1156 /* If the constraints say the regulator should be on at this point
1157 * and we have control then make sure it is enabled.
1159 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
1160 ret
= _regulator_do_enable(rdev
);
1161 if (ret
< 0 && ret
!= -EINVAL
) {
1162 rdev_err(rdev
, "failed to enable\n");
1167 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1168 && ops
->set_ramp_delay
) {
1169 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1171 rdev_err(rdev
, "failed to set ramp_delay\n");
1176 if (rdev
->constraints
->pull_down
&& ops
->set_pull_down
) {
1177 ret
= ops
->set_pull_down(rdev
);
1179 rdev_err(rdev
, "failed to set pull down\n");
1184 if (rdev
->constraints
->soft_start
&& ops
->set_soft_start
) {
1185 ret
= ops
->set_soft_start(rdev
);
1187 rdev_err(rdev
, "failed to set soft start\n");
1192 if (rdev
->constraints
->over_current_protection
1193 && ops
->set_over_current_protection
) {
1194 ret
= ops
->set_over_current_protection(rdev
);
1196 rdev_err(rdev
, "failed to set over current protection\n");
1201 if (rdev
->constraints
->active_discharge
&& ops
->set_active_discharge
) {
1202 bool ad_state
= (rdev
->constraints
->active_discharge
==
1203 REGULATOR_ACTIVE_DISCHARGE_ENABLE
) ? true : false;
1205 ret
= ops
->set_active_discharge(rdev
, ad_state
);
1207 rdev_err(rdev
, "failed to set active discharge\n");
1212 print_constraints(rdev
);
1217 * set_supply - set regulator supply regulator
1218 * @rdev: regulator name
1219 * @supply_rdev: supply regulator name
1221 * Called by platform initialisation code to set the supply regulator for this
1222 * regulator. This ensures that a regulators supply will also be enabled by the
1223 * core if it's child is enabled.
1225 static int set_supply(struct regulator_dev
*rdev
,
1226 struct regulator_dev
*supply_rdev
)
1230 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1232 if (!try_module_get(supply_rdev
->owner
))
1235 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1236 if (rdev
->supply
== NULL
) {
1240 supply_rdev
->open_count
++;
1246 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1247 * @rdev: regulator source
1248 * @consumer_dev_name: dev_name() string for device supply applies to
1249 * @supply: symbolic name for supply
1251 * Allows platform initialisation code to map physical regulator
1252 * sources to symbolic names for supplies for use by devices. Devices
1253 * should use these symbolic names to request regulators, avoiding the
1254 * need to provide board-specific regulator names as platform data.
1256 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1257 const char *consumer_dev_name
,
1260 struct regulator_map
*node
;
1266 if (consumer_dev_name
!= NULL
)
1271 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1272 if (node
->dev_name
&& consumer_dev_name
) {
1273 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1275 } else if (node
->dev_name
|| consumer_dev_name
) {
1279 if (strcmp(node
->supply
, supply
) != 0)
1282 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1284 dev_name(&node
->regulator
->dev
),
1285 node
->regulator
->desc
->name
,
1287 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1291 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1295 node
->regulator
= rdev
;
1296 node
->supply
= supply
;
1299 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1300 if (node
->dev_name
== NULL
) {
1306 list_add(&node
->list
, ®ulator_map_list
);
1310 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1312 struct regulator_map
*node
, *n
;
1314 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1315 if (rdev
== node
->regulator
) {
1316 list_del(&node
->list
);
1317 kfree(node
->dev_name
);
1323 #ifdef CONFIG_DEBUG_FS
1324 static ssize_t
constraint_flags_read_file(struct file
*file
,
1325 char __user
*user_buf
,
1326 size_t count
, loff_t
*ppos
)
1328 const struct regulator
*regulator
= file
->private_data
;
1329 const struct regulation_constraints
*c
= regulator
->rdev
->constraints
;
1336 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
1340 ret
= snprintf(buf
, PAGE_SIZE
,
1344 "ramp_disable: %u\n"
1347 "over_current_protection: %u\n",
1354 c
->over_current_protection
);
1356 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
1364 static const struct file_operations constraint_flags_fops
= {
1365 #ifdef CONFIG_DEBUG_FS
1366 .open
= simple_open
,
1367 .read
= constraint_flags_read_file
,
1368 .llseek
= default_llseek
,
1372 #define REG_STR_SIZE 64
1374 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1376 const char *supply_name
)
1378 struct regulator
*regulator
;
1379 char buf
[REG_STR_SIZE
];
1382 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1383 if (regulator
== NULL
)
1386 regulator_lock(rdev
);
1387 regulator
->rdev
= rdev
;
1388 list_add(®ulator
->list
, &rdev
->consumer_list
);
1391 regulator
->dev
= dev
;
1393 /* Add a link to the device sysfs entry */
1394 size
= snprintf(buf
, REG_STR_SIZE
, "%s-%s",
1395 dev
->kobj
.name
, supply_name
);
1396 if (size
>= REG_STR_SIZE
)
1399 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1400 if (regulator
->supply_name
== NULL
)
1403 err
= sysfs_create_link_nowarn(&rdev
->dev
.kobj
, &dev
->kobj
,
1406 rdev_dbg(rdev
, "could not add device link %s err %d\n",
1407 dev
->kobj
.name
, err
);
1411 regulator
->supply_name
= kstrdup_const(supply_name
, GFP_KERNEL
);
1412 if (regulator
->supply_name
== NULL
)
1416 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1418 if (!regulator
->debugfs
) {
1419 rdev_dbg(rdev
, "Failed to create debugfs directory\n");
1421 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1422 ®ulator
->uA_load
);
1423 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1424 ®ulator
->voltage
[PM_SUSPEND_ON
].min_uV
);
1425 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1426 ®ulator
->voltage
[PM_SUSPEND_ON
].max_uV
);
1427 debugfs_create_file("constraint_flags", 0444,
1428 regulator
->debugfs
, regulator
,
1429 &constraint_flags_fops
);
1433 * Check now if the regulator is an always on regulator - if
1434 * it is then we don't need to do nearly so much work for
1435 * enable/disable calls.
1437 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
) &&
1438 _regulator_is_enabled(rdev
))
1439 regulator
->always_on
= true;
1441 regulator_unlock(rdev
);
1444 list_del(®ulator
->list
);
1446 regulator_unlock(rdev
);
1450 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1452 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1453 return rdev
->constraints
->enable_time
;
1454 if (!rdev
->desc
->ops
->enable_time
)
1455 return rdev
->desc
->enable_time
;
1456 return rdev
->desc
->ops
->enable_time(rdev
);
1459 static struct regulator_supply_alias
*regulator_find_supply_alias(
1460 struct device
*dev
, const char *supply
)
1462 struct regulator_supply_alias
*map
;
1464 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1465 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1471 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1473 struct regulator_supply_alias
*map
;
1475 map
= regulator_find_supply_alias(*dev
, *supply
);
1477 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1478 *supply
, map
->alias_supply
,
1479 dev_name(map
->alias_dev
));
1480 *dev
= map
->alias_dev
;
1481 *supply
= map
->alias_supply
;
1485 static int regulator_match(struct device
*dev
, const void *data
)
1487 struct regulator_dev
*r
= dev_to_rdev(dev
);
1489 return strcmp(rdev_get_name(r
), data
) == 0;
1492 static struct regulator_dev
*regulator_lookup_by_name(const char *name
)
1496 dev
= class_find_device(®ulator_class
, NULL
, name
, regulator_match
);
1498 return dev
? dev_to_rdev(dev
) : NULL
;
1502 * regulator_dev_lookup - lookup a regulator device.
1503 * @dev: device for regulator "consumer".
1504 * @supply: Supply name or regulator ID.
1506 * If successful, returns a struct regulator_dev that corresponds to the name
1507 * @supply and with the embedded struct device refcount incremented by one.
1508 * The refcount must be dropped by calling put_device().
1509 * On failure one of the following ERR-PTR-encoded values is returned:
1510 * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
1513 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1516 struct regulator_dev
*r
= NULL
;
1517 struct device_node
*node
;
1518 struct regulator_map
*map
;
1519 const char *devname
= NULL
;
1521 regulator_supply_alias(&dev
, &supply
);
1523 /* first do a dt based lookup */
1524 if (dev
&& dev
->of_node
) {
1525 node
= of_get_regulator(dev
, supply
);
1527 r
= of_find_regulator_by_node(node
);
1532 * We have a node, but there is no device.
1533 * assume it has not registered yet.
1535 return ERR_PTR(-EPROBE_DEFER
);
1539 /* if not found, try doing it non-dt way */
1541 devname
= dev_name(dev
);
1543 mutex_lock(®ulator_list_mutex
);
1544 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1545 /* If the mapping has a device set up it must match */
1546 if (map
->dev_name
&&
1547 (!devname
|| strcmp(map
->dev_name
, devname
)))
1550 if (strcmp(map
->supply
, supply
) == 0 &&
1551 get_device(&map
->regulator
->dev
)) {
1556 mutex_unlock(®ulator_list_mutex
);
1561 r
= regulator_lookup_by_name(supply
);
1565 return ERR_PTR(-ENODEV
);
1568 static int regulator_resolve_supply(struct regulator_dev
*rdev
)
1570 struct regulator_dev
*r
;
1571 struct device
*dev
= rdev
->dev
.parent
;
1574 /* No supply to resovle? */
1575 if (!rdev
->supply_name
)
1578 /* Supply already resolved? */
1582 r
= regulator_dev_lookup(dev
, rdev
->supply_name
);
1586 /* Did the lookup explicitly defer for us? */
1587 if (ret
== -EPROBE_DEFER
)
1590 if (have_full_constraints()) {
1591 r
= dummy_regulator_rdev
;
1592 get_device(&r
->dev
);
1594 dev_err(dev
, "Failed to resolve %s-supply for %s\n",
1595 rdev
->supply_name
, rdev
->desc
->name
);
1596 return -EPROBE_DEFER
;
1601 * If the supply's parent device is not the same as the
1602 * regulator's parent device, then ensure the parent device
1603 * is bound before we resolve the supply, in case the parent
1604 * device get probe deferred and unregisters the supply.
1606 if (r
->dev
.parent
&& r
->dev
.parent
!= rdev
->dev
.parent
) {
1607 if (!device_is_bound(r
->dev
.parent
)) {
1608 put_device(&r
->dev
);
1609 return -EPROBE_DEFER
;
1613 /* Recursively resolve the supply of the supply */
1614 ret
= regulator_resolve_supply(r
);
1616 put_device(&r
->dev
);
1620 ret
= set_supply(rdev
, r
);
1622 put_device(&r
->dev
);
1626 /* Cascade always-on state to supply */
1627 if (_regulator_is_enabled(rdev
)) {
1628 ret
= regulator_enable(rdev
->supply
);
1630 _regulator_put(rdev
->supply
);
1631 rdev
->supply
= NULL
;
1639 /* Internal regulator request function */
1640 struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1641 enum regulator_get_type get_type
)
1643 struct regulator_dev
*rdev
;
1644 struct regulator
*regulator
;
1645 const char *devname
= dev
? dev_name(dev
) : "deviceless";
1648 if (get_type
>= MAX_GET_TYPE
) {
1649 dev_err(dev
, "invalid type %d in %s\n", get_type
, __func__
);
1650 return ERR_PTR(-EINVAL
);
1654 pr_err("get() with no identifier\n");
1655 return ERR_PTR(-EINVAL
);
1658 rdev
= regulator_dev_lookup(dev
, id
);
1660 ret
= PTR_ERR(rdev
);
1663 * If regulator_dev_lookup() fails with error other
1664 * than -ENODEV our job here is done, we simply return it.
1667 return ERR_PTR(ret
);
1669 if (!have_full_constraints()) {
1671 "incomplete constraints, dummy supplies not allowed\n");
1672 return ERR_PTR(-ENODEV
);
1678 * Assume that a regulator is physically present and
1679 * enabled, even if it isn't hooked up, and just
1683 "%s supply %s not found, using dummy regulator\n",
1685 rdev
= dummy_regulator_rdev
;
1686 get_device(&rdev
->dev
);
1691 "dummy supplies not allowed for exclusive requests\n");
1695 return ERR_PTR(-ENODEV
);
1699 if (rdev
->exclusive
) {
1700 regulator
= ERR_PTR(-EPERM
);
1701 put_device(&rdev
->dev
);
1705 if (get_type
== EXCLUSIVE_GET
&& rdev
->open_count
) {
1706 regulator
= ERR_PTR(-EBUSY
);
1707 put_device(&rdev
->dev
);
1711 ret
= regulator_resolve_supply(rdev
);
1713 regulator
= ERR_PTR(ret
);
1714 put_device(&rdev
->dev
);
1718 if (!try_module_get(rdev
->owner
)) {
1719 regulator
= ERR_PTR(-EPROBE_DEFER
);
1720 put_device(&rdev
->dev
);
1724 regulator
= create_regulator(rdev
, dev
, id
);
1725 if (regulator
== NULL
) {
1726 regulator
= ERR_PTR(-ENOMEM
);
1727 put_device(&rdev
->dev
);
1728 module_put(rdev
->owner
);
1733 if (get_type
== EXCLUSIVE_GET
) {
1734 rdev
->exclusive
= 1;
1736 ret
= _regulator_is_enabled(rdev
);
1738 rdev
->use_count
= 1;
1740 rdev
->use_count
= 0;
1743 device_link_add(dev
, &rdev
->dev
, DL_FLAG_STATELESS
);
1749 * regulator_get - lookup and obtain a reference to a regulator.
1750 * @dev: device for regulator "consumer"
1751 * @id: Supply name or regulator ID.
1753 * Returns a struct regulator corresponding to the regulator producer,
1754 * or IS_ERR() condition containing errno.
1756 * Use of supply names configured via regulator_set_device_supply() is
1757 * strongly encouraged. It is recommended that the supply name used
1758 * should match the name used for the supply and/or the relevant
1759 * device pins in the datasheet.
1761 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1763 return _regulator_get(dev
, id
, NORMAL_GET
);
1765 EXPORT_SYMBOL_GPL(regulator_get
);
1768 * regulator_get_exclusive - obtain exclusive access to a regulator.
1769 * @dev: device for regulator "consumer"
1770 * @id: Supply name or regulator ID.
1772 * Returns a struct regulator corresponding to the regulator producer,
1773 * or IS_ERR() condition containing errno. Other consumers will be
1774 * unable to obtain this regulator while this reference is held and the
1775 * use count for the regulator will be initialised to reflect the current
1776 * state of the regulator.
1778 * This is intended for use by consumers which cannot tolerate shared
1779 * use of the regulator such as those which need to force the
1780 * regulator off for correct operation of the hardware they are
1783 * Use of supply names configured via regulator_set_device_supply() is
1784 * strongly encouraged. It is recommended that the supply name used
1785 * should match the name used for the supply and/or the relevant
1786 * device pins in the datasheet.
1788 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1790 return _regulator_get(dev
, id
, EXCLUSIVE_GET
);
1792 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1795 * regulator_get_optional - obtain optional access to a regulator.
1796 * @dev: device for regulator "consumer"
1797 * @id: Supply name or regulator ID.
1799 * Returns a struct regulator corresponding to the regulator producer,
1800 * or IS_ERR() condition containing errno.
1802 * This is intended for use by consumers for devices which can have
1803 * some supplies unconnected in normal use, such as some MMC devices.
1804 * It can allow the regulator core to provide stub supplies for other
1805 * supplies requested using normal regulator_get() calls without
1806 * disrupting the operation of drivers that can handle absent
1809 * Use of supply names configured via regulator_set_device_supply() is
1810 * strongly encouraged. It is recommended that the supply name used
1811 * should match the name used for the supply and/or the relevant
1812 * device pins in the datasheet.
1814 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1816 return _regulator_get(dev
, id
, OPTIONAL_GET
);
1818 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1820 /* regulator_list_mutex lock held by regulator_put() */
1821 static void _regulator_put(struct regulator
*regulator
)
1823 struct regulator_dev
*rdev
;
1825 if (IS_ERR_OR_NULL(regulator
))
1828 lockdep_assert_held_once(®ulator_list_mutex
);
1830 rdev
= regulator
->rdev
;
1832 debugfs_remove_recursive(regulator
->debugfs
);
1834 if (regulator
->dev
) {
1836 struct regulator
*r
;
1838 list_for_each_entry(r
, &rdev
->consumer_list
, list
)
1839 if (r
->dev
== regulator
->dev
)
1843 device_link_remove(regulator
->dev
, &rdev
->dev
);
1845 /* remove any sysfs entries */
1846 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1849 regulator_lock(rdev
);
1850 list_del(®ulator
->list
);
1853 rdev
->exclusive
= 0;
1854 put_device(&rdev
->dev
);
1855 regulator_unlock(rdev
);
1857 kfree_const(regulator
->supply_name
);
1860 module_put(rdev
->owner
);
1864 * regulator_put - "free" the regulator source
1865 * @regulator: regulator source
1867 * Note: drivers must ensure that all regulator_enable calls made on this
1868 * regulator source are balanced by regulator_disable calls prior to calling
1871 void regulator_put(struct regulator
*regulator
)
1873 mutex_lock(®ulator_list_mutex
);
1874 _regulator_put(regulator
);
1875 mutex_unlock(®ulator_list_mutex
);
1877 EXPORT_SYMBOL_GPL(regulator_put
);
1880 * regulator_register_supply_alias - Provide device alias for supply lookup
1882 * @dev: device that will be given as the regulator "consumer"
1883 * @id: Supply name or regulator ID
1884 * @alias_dev: device that should be used to lookup the supply
1885 * @alias_id: Supply name or regulator ID that should be used to lookup the
1888 * All lookups for id on dev will instead be conducted for alias_id on
1891 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1892 struct device
*alias_dev
,
1893 const char *alias_id
)
1895 struct regulator_supply_alias
*map
;
1897 map
= regulator_find_supply_alias(dev
, id
);
1901 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1906 map
->src_supply
= id
;
1907 map
->alias_dev
= alias_dev
;
1908 map
->alias_supply
= alias_id
;
1910 list_add(&map
->list
, ®ulator_supply_alias_list
);
1912 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1913 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1917 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1920 * regulator_unregister_supply_alias - Remove device alias
1922 * @dev: device that will be given as the regulator "consumer"
1923 * @id: Supply name or regulator ID
1925 * Remove a lookup alias if one exists for id on dev.
1927 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1929 struct regulator_supply_alias
*map
;
1931 map
= regulator_find_supply_alias(dev
, id
);
1933 list_del(&map
->list
);
1937 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1940 * regulator_bulk_register_supply_alias - register multiple aliases
1942 * @dev: device that will be given as the regulator "consumer"
1943 * @id: List of supply names or regulator IDs
1944 * @alias_dev: device that should be used to lookup the supply
1945 * @alias_id: List of supply names or regulator IDs that should be used to
1947 * @num_id: Number of aliases to register
1949 * @return 0 on success, an errno on failure.
1951 * This helper function allows drivers to register several supply
1952 * aliases in one operation. If any of the aliases cannot be
1953 * registered any aliases that were registered will be removed
1954 * before returning to the caller.
1956 int regulator_bulk_register_supply_alias(struct device
*dev
,
1957 const char *const *id
,
1958 struct device
*alias_dev
,
1959 const char *const *alias_id
,
1965 for (i
= 0; i
< num_id
; ++i
) {
1966 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1976 "Failed to create supply alias %s,%s -> %s,%s\n",
1977 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1980 regulator_unregister_supply_alias(dev
, id
[i
]);
1984 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1987 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1989 * @dev: device that will be given as the regulator "consumer"
1990 * @id: List of supply names or regulator IDs
1991 * @num_id: Number of aliases to unregister
1993 * This helper function allows drivers to unregister several supply
1994 * aliases in one operation.
1996 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1997 const char *const *id
,
2002 for (i
= 0; i
< num_id
; ++i
)
2003 regulator_unregister_supply_alias(dev
, id
[i
]);
2005 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
2008 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
2009 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
2010 const struct regulator_config
*config
)
2012 struct regulator_enable_gpio
*pin
;
2013 struct gpio_desc
*gpiod
;
2016 if (config
->ena_gpiod
)
2017 gpiod
= config
->ena_gpiod
;
2019 gpiod
= gpio_to_desc(config
->ena_gpio
);
2021 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
2022 if (pin
->gpiod
== gpiod
) {
2023 rdev_dbg(rdev
, "GPIO %d is already used\n",
2025 goto update_ena_gpio_to_rdev
;
2029 if (!config
->ena_gpiod
) {
2030 ret
= gpio_request_one(config
->ena_gpio
,
2031 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
2032 rdev_get_name(rdev
));
2037 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
2039 if (!config
->ena_gpiod
)
2040 gpio_free(config
->ena_gpio
);
2045 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
2046 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
2048 update_ena_gpio_to_rdev
:
2049 pin
->request_count
++;
2050 rdev
->ena_pin
= pin
;
2054 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
2056 struct regulator_enable_gpio
*pin
, *n
;
2061 /* Free the GPIO only in case of no use */
2062 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
2063 if (pin
->gpiod
== rdev
->ena_pin
->gpiod
) {
2064 if (pin
->request_count
<= 1) {
2065 pin
->request_count
= 0;
2066 gpiod_put(pin
->gpiod
);
2067 list_del(&pin
->list
);
2069 rdev
->ena_pin
= NULL
;
2072 pin
->request_count
--;
2079 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
2080 * @rdev: regulator_dev structure
2081 * @enable: enable GPIO at initial use?
2083 * GPIO is enabled in case of initial use. (enable_count is 0)
2084 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2086 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
2088 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
2094 /* Enable GPIO at initial use */
2095 if (pin
->enable_count
== 0)
2096 gpiod_set_value_cansleep(pin
->gpiod
,
2097 !pin
->ena_gpio_invert
);
2099 pin
->enable_count
++;
2101 if (pin
->enable_count
> 1) {
2102 pin
->enable_count
--;
2106 /* Disable GPIO if not used */
2107 if (pin
->enable_count
<= 1) {
2108 gpiod_set_value_cansleep(pin
->gpiod
,
2109 pin
->ena_gpio_invert
);
2110 pin
->enable_count
= 0;
2118 * _regulator_enable_delay - a delay helper function
2119 * @delay: time to delay in microseconds
2121 * Delay for the requested amount of time as per the guidelines in:
2123 * Documentation/timers/timers-howto.txt
2125 * The assumption here is that regulators will never be enabled in
2126 * atomic context and therefore sleeping functions can be used.
2128 static void _regulator_enable_delay(unsigned int delay
)
2130 unsigned int ms
= delay
/ 1000;
2131 unsigned int us
= delay
% 1000;
2135 * For small enough values, handle super-millisecond
2136 * delays in the usleep_range() call below.
2145 * Give the scheduler some room to coalesce with any other
2146 * wakeup sources. For delays shorter than 10 us, don't even
2147 * bother setting up high-resolution timers and just busy-
2151 usleep_range(us
, us
+ 100);
2156 static int _regulator_do_enable(struct regulator_dev
*rdev
)
2160 /* Query before enabling in case configuration dependent. */
2161 ret
= _regulator_get_enable_time(rdev
);
2165 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
2169 trace_regulator_enable(rdev_get_name(rdev
));
2171 if (rdev
->desc
->off_on_delay
) {
2172 /* if needed, keep a distance of off_on_delay from last time
2173 * this regulator was disabled.
2175 unsigned long start_jiffy
= jiffies
;
2176 unsigned long intended
, max_delay
, remaining
;
2178 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
2179 intended
= rdev
->last_off_jiffy
+ max_delay
;
2181 if (time_before(start_jiffy
, intended
)) {
2182 /* calc remaining jiffies to deal with one-time
2184 * in case of multiple timer wrapping, either it can be
2185 * detected by out-of-range remaining, or it cannot be
2186 * detected and we gets a panelty of
2187 * _regulator_enable_delay().
2189 remaining
= intended
- start_jiffy
;
2190 if (remaining
<= max_delay
)
2191 _regulator_enable_delay(
2192 jiffies_to_usecs(remaining
));
2196 if (rdev
->ena_pin
) {
2197 if (!rdev
->ena_gpio_state
) {
2198 ret
= regulator_ena_gpio_ctrl(rdev
, true);
2201 rdev
->ena_gpio_state
= 1;
2203 } else if (rdev
->desc
->ops
->enable
) {
2204 ret
= rdev
->desc
->ops
->enable(rdev
);
2211 /* Allow the regulator to ramp; it would be useful to extend
2212 * this for bulk operations so that the regulators can ramp
2214 trace_regulator_enable_delay(rdev_get_name(rdev
));
2216 _regulator_enable_delay(delay
);
2218 trace_regulator_enable_complete(rdev_get_name(rdev
));
2223 /* locks held by regulator_enable() */
2224 static int _regulator_enable(struct regulator_dev
*rdev
)
2228 lockdep_assert_held_once(&rdev
->mutex
);
2230 /* check voltage and requested load before enabling */
2231 if (regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_DRMS
))
2232 drms_uA_update(rdev
);
2234 if (rdev
->use_count
== 0) {
2235 /* The regulator may on if it's not switchable or left on */
2236 ret
= _regulator_is_enabled(rdev
);
2237 if (ret
== -EINVAL
|| ret
== 0) {
2238 if (!regulator_ops_is_valid(rdev
,
2239 REGULATOR_CHANGE_STATUS
))
2242 ret
= _regulator_do_enable(rdev
);
2246 _notifier_call_chain(rdev
, REGULATOR_EVENT_ENABLE
,
2248 } else if (ret
< 0) {
2249 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
2252 /* Fallthrough on positive return values - already enabled */
2261 * regulator_enable - enable regulator output
2262 * @regulator: regulator source
2264 * Request that the regulator be enabled with the regulator output at
2265 * the predefined voltage or current value. Calls to regulator_enable()
2266 * must be balanced with calls to regulator_disable().
2268 * NOTE: the output value can be set by other drivers, boot loader or may be
2269 * hardwired in the regulator.
2271 int regulator_enable(struct regulator
*regulator
)
2273 struct regulator_dev
*rdev
= regulator
->rdev
;
2276 if (regulator
->always_on
)
2280 ret
= regulator_enable(rdev
->supply
);
2285 mutex_lock(&rdev
->mutex
);
2286 ret
= _regulator_enable(rdev
);
2287 mutex_unlock(&rdev
->mutex
);
2289 if (ret
!= 0 && rdev
->supply
)
2290 regulator_disable(rdev
->supply
);
2294 EXPORT_SYMBOL_GPL(regulator_enable
);
2296 static int _regulator_do_disable(struct regulator_dev
*rdev
)
2300 trace_regulator_disable(rdev_get_name(rdev
));
2302 if (rdev
->ena_pin
) {
2303 if (rdev
->ena_gpio_state
) {
2304 ret
= regulator_ena_gpio_ctrl(rdev
, false);
2307 rdev
->ena_gpio_state
= 0;
2310 } else if (rdev
->desc
->ops
->disable
) {
2311 ret
= rdev
->desc
->ops
->disable(rdev
);
2316 /* cares about last_off_jiffy only if off_on_delay is required by
2319 if (rdev
->desc
->off_on_delay
)
2320 rdev
->last_off_jiffy
= jiffies
;
2322 trace_regulator_disable_complete(rdev_get_name(rdev
));
2327 /* locks held by regulator_disable() */
2328 static int _regulator_disable(struct regulator_dev
*rdev
)
2332 lockdep_assert_held_once(&rdev
->mutex
);
2334 if (WARN(rdev
->use_count
<= 0,
2335 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
2338 /* are we the last user and permitted to disable ? */
2339 if (rdev
->use_count
== 1 &&
2340 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
2342 /* we are last user */
2343 if (regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
)) {
2344 ret
= _notifier_call_chain(rdev
,
2345 REGULATOR_EVENT_PRE_DISABLE
,
2347 if (ret
& NOTIFY_STOP_MASK
)
2350 ret
= _regulator_do_disable(rdev
);
2352 rdev_err(rdev
, "failed to disable\n");
2353 _notifier_call_chain(rdev
,
2354 REGULATOR_EVENT_ABORT_DISABLE
,
2358 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
2362 rdev
->use_count
= 0;
2363 } else if (rdev
->use_count
> 1) {
2364 if (regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_DRMS
))
2365 drms_uA_update(rdev
);
2374 * regulator_disable - disable regulator output
2375 * @regulator: regulator source
2377 * Disable the regulator output voltage or current. Calls to
2378 * regulator_enable() must be balanced with calls to
2379 * regulator_disable().
2381 * NOTE: this will only disable the regulator output if no other consumer
2382 * devices have it enabled, the regulator device supports disabling and
2383 * machine constraints permit this operation.
2385 int regulator_disable(struct regulator
*regulator
)
2387 struct regulator_dev
*rdev
= regulator
->rdev
;
2390 if (regulator
->always_on
)
2393 mutex_lock(&rdev
->mutex
);
2394 ret
= _regulator_disable(rdev
);
2395 mutex_unlock(&rdev
->mutex
);
2397 if (ret
== 0 && rdev
->supply
)
2398 regulator_disable(rdev
->supply
);
2402 EXPORT_SYMBOL_GPL(regulator_disable
);
2404 /* locks held by regulator_force_disable() */
2405 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2409 lockdep_assert_held_once(&rdev
->mutex
);
2411 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2412 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2413 if (ret
& NOTIFY_STOP_MASK
)
2416 ret
= _regulator_do_disable(rdev
);
2418 rdev_err(rdev
, "failed to force disable\n");
2419 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2420 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2424 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2425 REGULATOR_EVENT_DISABLE
, NULL
);
2431 * regulator_force_disable - force disable regulator output
2432 * @regulator: regulator source
2434 * Forcibly disable the regulator output voltage or current.
2435 * NOTE: this *will* disable the regulator output even if other consumer
2436 * devices have it enabled. This should be used for situations when device
2437 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2439 int regulator_force_disable(struct regulator
*regulator
)
2441 struct regulator_dev
*rdev
= regulator
->rdev
;
2444 mutex_lock(&rdev
->mutex
);
2445 regulator
->uA_load
= 0;
2446 ret
= _regulator_force_disable(regulator
->rdev
);
2447 mutex_unlock(&rdev
->mutex
);
2450 while (rdev
->open_count
--)
2451 regulator_disable(rdev
->supply
);
2455 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2457 static void regulator_disable_work(struct work_struct
*work
)
2459 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2463 regulator_lock(rdev
);
2465 BUG_ON(!rdev
->deferred_disables
);
2467 count
= rdev
->deferred_disables
;
2468 rdev
->deferred_disables
= 0;
2471 * Workqueue functions queue the new work instance while the previous
2472 * work instance is being processed. Cancel the queued work instance
2473 * as the work instance under processing does the job of the queued
2476 cancel_delayed_work(&rdev
->disable_work
);
2478 for (i
= 0; i
< count
; i
++) {
2479 ret
= _regulator_disable(rdev
);
2481 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2484 regulator_unlock(rdev
);
2487 for (i
= 0; i
< count
; i
++) {
2488 ret
= regulator_disable(rdev
->supply
);
2491 "Supply disable failed: %d\n", ret
);
2498 * regulator_disable_deferred - disable regulator output with delay
2499 * @regulator: regulator source
2500 * @ms: miliseconds until the regulator is disabled
2502 * Execute regulator_disable() on the regulator after a delay. This
2503 * is intended for use with devices that require some time to quiesce.
2505 * NOTE: this will only disable the regulator output if no other consumer
2506 * devices have it enabled, the regulator device supports disabling and
2507 * machine constraints permit this operation.
2509 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2511 struct regulator_dev
*rdev
= regulator
->rdev
;
2513 if (regulator
->always_on
)
2517 return regulator_disable(regulator
);
2519 regulator_lock(rdev
);
2520 rdev
->deferred_disables
++;
2521 mod_delayed_work(system_power_efficient_wq
, &rdev
->disable_work
,
2522 msecs_to_jiffies(ms
));
2523 regulator_unlock(rdev
);
2527 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2529 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2531 /* A GPIO control always takes precedence */
2533 return rdev
->ena_gpio_state
;
2535 /* If we don't know then assume that the regulator is always on */
2536 if (!rdev
->desc
->ops
->is_enabled
)
2539 return rdev
->desc
->ops
->is_enabled(rdev
);
2542 static int _regulator_list_voltage(struct regulator_dev
*rdev
,
2543 unsigned selector
, int lock
)
2545 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2548 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2549 return rdev
->desc
->fixed_uV
;
2551 if (ops
->list_voltage
) {
2552 if (selector
>= rdev
->desc
->n_voltages
)
2555 regulator_lock(rdev
);
2556 ret
= ops
->list_voltage(rdev
, selector
);
2558 regulator_unlock(rdev
);
2559 } else if (rdev
->is_switch
&& rdev
->supply
) {
2560 ret
= _regulator_list_voltage(rdev
->supply
->rdev
,
2567 if (ret
< rdev
->constraints
->min_uV
)
2569 else if (ret
> rdev
->constraints
->max_uV
)
2577 * regulator_is_enabled - is the regulator output enabled
2578 * @regulator: regulator source
2580 * Returns positive if the regulator driver backing the source/client
2581 * has requested that the device be enabled, zero if it hasn't, else a
2582 * negative errno code.
2584 * Note that the device backing this regulator handle can have multiple
2585 * users, so it might be enabled even if regulator_enable() was never
2586 * called for this particular source.
2588 int regulator_is_enabled(struct regulator
*regulator
)
2592 if (regulator
->always_on
)
2595 mutex_lock(®ulator
->rdev
->mutex
);
2596 ret
= _regulator_is_enabled(regulator
->rdev
);
2597 mutex_unlock(®ulator
->rdev
->mutex
);
2601 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2604 * regulator_count_voltages - count regulator_list_voltage() selectors
2605 * @regulator: regulator source
2607 * Returns number of selectors, or negative errno. Selectors are
2608 * numbered starting at zero, and typically correspond to bitfields
2609 * in hardware registers.
2611 int regulator_count_voltages(struct regulator
*regulator
)
2613 struct regulator_dev
*rdev
= regulator
->rdev
;
2615 if (rdev
->desc
->n_voltages
)
2616 return rdev
->desc
->n_voltages
;
2618 if (!rdev
->is_switch
|| !rdev
->supply
)
2621 return regulator_count_voltages(rdev
->supply
);
2623 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2626 * regulator_list_voltage - enumerate supported voltages
2627 * @regulator: regulator source
2628 * @selector: identify voltage to list
2629 * Context: can sleep
2631 * Returns a voltage that can be passed to @regulator_set_voltage(),
2632 * zero if this selector code can't be used on this system, or a
2635 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2637 return _regulator_list_voltage(regulator
->rdev
, selector
, 1);
2639 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2642 * regulator_get_regmap - get the regulator's register map
2643 * @regulator: regulator source
2645 * Returns the register map for the given regulator, or an ERR_PTR value
2646 * if the regulator doesn't use regmap.
2648 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
2650 struct regmap
*map
= regulator
->rdev
->regmap
;
2652 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
2656 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2657 * @regulator: regulator source
2658 * @vsel_reg: voltage selector register, output parameter
2659 * @vsel_mask: mask for voltage selector bitfield, output parameter
2661 * Returns the hardware register offset and bitmask used for setting the
2662 * regulator voltage. This might be useful when configuring voltage-scaling
2663 * hardware or firmware that can make I2C requests behind the kernel's back,
2666 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2667 * and 0 is returned, otherwise a negative errno is returned.
2669 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
2671 unsigned *vsel_mask
)
2673 struct regulator_dev
*rdev
= regulator
->rdev
;
2674 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2676 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2679 *vsel_reg
= rdev
->desc
->vsel_reg
;
2680 *vsel_mask
= rdev
->desc
->vsel_mask
;
2684 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
2687 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2688 * @regulator: regulator source
2689 * @selector: identify voltage to list
2691 * Converts the selector to a hardware-specific voltage selector that can be
2692 * directly written to the regulator registers. The address of the voltage
2693 * register can be determined by calling @regulator_get_hardware_vsel_register.
2695 * On error a negative errno is returned.
2697 int regulator_list_hardware_vsel(struct regulator
*regulator
,
2700 struct regulator_dev
*rdev
= regulator
->rdev
;
2701 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2703 if (selector
>= rdev
->desc
->n_voltages
)
2705 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2710 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
2713 * regulator_get_linear_step - return the voltage step size between VSEL values
2714 * @regulator: regulator source
2716 * Returns the voltage step size between VSEL values for linear
2717 * regulators, or return 0 if the regulator isn't a linear regulator.
2719 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2721 struct regulator_dev
*rdev
= regulator
->rdev
;
2723 return rdev
->desc
->uV_step
;
2725 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2728 * regulator_is_supported_voltage - check if a voltage range can be supported
2730 * @regulator: Regulator to check.
2731 * @min_uV: Minimum required voltage in uV.
2732 * @max_uV: Maximum required voltage in uV.
2734 * Returns a boolean or a negative error code.
2736 int regulator_is_supported_voltage(struct regulator
*regulator
,
2737 int min_uV
, int max_uV
)
2739 struct regulator_dev
*rdev
= regulator
->rdev
;
2740 int i
, voltages
, ret
;
2742 /* If we can't change voltage check the current voltage */
2743 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
2744 ret
= regulator_get_voltage(regulator
);
2746 return min_uV
<= ret
&& ret
<= max_uV
;
2751 /* Any voltage within constrains range is fine? */
2752 if (rdev
->desc
->continuous_voltage_range
)
2753 return min_uV
>= rdev
->constraints
->min_uV
&&
2754 max_uV
<= rdev
->constraints
->max_uV
;
2756 ret
= regulator_count_voltages(regulator
);
2761 for (i
= 0; i
< voltages
; i
++) {
2762 ret
= regulator_list_voltage(regulator
, i
);
2764 if (ret
>= min_uV
&& ret
<= max_uV
)
2770 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2772 static int regulator_map_voltage(struct regulator_dev
*rdev
, int min_uV
,
2775 const struct regulator_desc
*desc
= rdev
->desc
;
2777 if (desc
->ops
->map_voltage
)
2778 return desc
->ops
->map_voltage(rdev
, min_uV
, max_uV
);
2780 if (desc
->ops
->list_voltage
== regulator_list_voltage_linear
)
2781 return regulator_map_voltage_linear(rdev
, min_uV
, max_uV
);
2783 if (desc
->ops
->list_voltage
== regulator_list_voltage_linear_range
)
2784 return regulator_map_voltage_linear_range(rdev
, min_uV
, max_uV
);
2786 return regulator_map_voltage_iterate(rdev
, min_uV
, max_uV
);
2789 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
2790 int min_uV
, int max_uV
,
2793 struct pre_voltage_change_data data
;
2796 data
.old_uV
= _regulator_get_voltage(rdev
);
2797 data
.min_uV
= min_uV
;
2798 data
.max_uV
= max_uV
;
2799 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2801 if (ret
& NOTIFY_STOP_MASK
)
2804 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
2808 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2809 (void *)data
.old_uV
);
2814 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
2815 int uV
, unsigned selector
)
2817 struct pre_voltage_change_data data
;
2820 data
.old_uV
= _regulator_get_voltage(rdev
);
2823 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2825 if (ret
& NOTIFY_STOP_MASK
)
2828 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
2832 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2833 (void *)data
.old_uV
);
2838 static int _regulator_set_voltage_time(struct regulator_dev
*rdev
,
2839 int old_uV
, int new_uV
)
2841 unsigned int ramp_delay
= 0;
2843 if (rdev
->constraints
->ramp_delay
)
2844 ramp_delay
= rdev
->constraints
->ramp_delay
;
2845 else if (rdev
->desc
->ramp_delay
)
2846 ramp_delay
= rdev
->desc
->ramp_delay
;
2847 else if (rdev
->constraints
->settling_time
)
2848 return rdev
->constraints
->settling_time
;
2849 else if (rdev
->constraints
->settling_time_up
&&
2851 return rdev
->constraints
->settling_time_up
;
2852 else if (rdev
->constraints
->settling_time_down
&&
2854 return rdev
->constraints
->settling_time_down
;
2856 if (ramp_delay
== 0) {
2857 rdev_dbg(rdev
, "ramp_delay not set\n");
2861 return DIV_ROUND_UP(abs(new_uV
- old_uV
), ramp_delay
);
2864 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2865 int min_uV
, int max_uV
)
2870 unsigned int selector
;
2871 int old_selector
= -1;
2872 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2873 int old_uV
= _regulator_get_voltage(rdev
);
2875 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2877 min_uV
+= rdev
->constraints
->uV_offset
;
2878 max_uV
+= rdev
->constraints
->uV_offset
;
2881 * If we can't obtain the old selector there is not enough
2882 * info to call set_voltage_time_sel().
2884 if (_regulator_is_enabled(rdev
) &&
2885 ops
->set_voltage_time_sel
&& ops
->get_voltage_sel
) {
2886 old_selector
= ops
->get_voltage_sel(rdev
);
2887 if (old_selector
< 0)
2888 return old_selector
;
2891 if (ops
->set_voltage
) {
2892 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
2896 if (ops
->list_voltage
)
2897 best_val
= ops
->list_voltage(rdev
,
2900 best_val
= _regulator_get_voltage(rdev
);
2903 } else if (ops
->set_voltage_sel
) {
2904 ret
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
2906 best_val
= ops
->list_voltage(rdev
, ret
);
2907 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2909 if (old_selector
== selector
)
2912 ret
= _regulator_call_set_voltage_sel(
2913 rdev
, best_val
, selector
);
2925 if (ops
->set_voltage_time_sel
) {
2927 * Call set_voltage_time_sel if successfully obtained
2930 if (old_selector
>= 0 && old_selector
!= selector
)
2931 delay
= ops
->set_voltage_time_sel(rdev
, old_selector
,
2934 if (old_uV
!= best_val
) {
2935 if (ops
->set_voltage_time
)
2936 delay
= ops
->set_voltage_time(rdev
, old_uV
,
2939 delay
= _regulator_set_voltage_time(rdev
,
2946 rdev_warn(rdev
, "failed to get delay: %d\n", delay
);
2950 /* Insert any necessary delays */
2951 if (delay
>= 1000) {
2952 mdelay(delay
/ 1000);
2953 udelay(delay
% 1000);
2958 if (best_val
>= 0) {
2959 unsigned long data
= best_val
;
2961 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2966 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2971 static int _regulator_do_set_suspend_voltage(struct regulator_dev
*rdev
,
2972 int min_uV
, int max_uV
, suspend_state_t state
)
2974 struct regulator_state
*rstate
;
2977 rstate
= regulator_get_suspend_state(rdev
, state
);
2981 if (min_uV
< rstate
->min_uV
)
2982 min_uV
= rstate
->min_uV
;
2983 if (max_uV
> rstate
->max_uV
)
2984 max_uV
= rstate
->max_uV
;
2986 sel
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
2990 uV
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2991 if (uV
>= min_uV
&& uV
<= max_uV
)
2997 static int regulator_set_voltage_unlocked(struct regulator
*regulator
,
2998 int min_uV
, int max_uV
,
2999 suspend_state_t state
)
3001 struct regulator_dev
*rdev
= regulator
->rdev
;
3002 struct regulator_voltage
*voltage
= ®ulator
->voltage
[state
];
3004 int old_min_uV
, old_max_uV
;
3006 int best_supply_uV
= 0;
3007 int supply_change_uV
= 0;
3009 /* If we're setting the same range as last time the change
3010 * should be a noop (some cpufreq implementations use the same
3011 * voltage for multiple frequencies, for example).
3013 if (voltage
->min_uV
== min_uV
&& voltage
->max_uV
== max_uV
)
3016 /* If we're trying to set a range that overlaps the current voltage,
3017 * return successfully even though the regulator does not support
3018 * changing the voltage.
3020 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
3021 current_uV
= _regulator_get_voltage(rdev
);
3022 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
3023 voltage
->min_uV
= min_uV
;
3024 voltage
->max_uV
= max_uV
;
3030 if (!rdev
->desc
->ops
->set_voltage
&&
3031 !rdev
->desc
->ops
->set_voltage_sel
) {
3036 /* constraints check */
3037 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
3041 /* restore original values in case of error */
3042 old_min_uV
= voltage
->min_uV
;
3043 old_max_uV
= voltage
->max_uV
;
3044 voltage
->min_uV
= min_uV
;
3045 voltage
->max_uV
= max_uV
;
3047 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
, state
);
3052 regulator_ops_is_valid(rdev
->supply
->rdev
,
3053 REGULATOR_CHANGE_VOLTAGE
) &&
3054 (rdev
->desc
->min_dropout_uV
|| !(rdev
->desc
->ops
->get_voltage
||
3055 rdev
->desc
->ops
->get_voltage_sel
))) {
3056 int current_supply_uV
;
3059 selector
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
3065 best_supply_uV
= _regulator_list_voltage(rdev
, selector
, 0);
3066 if (best_supply_uV
< 0) {
3067 ret
= best_supply_uV
;
3071 best_supply_uV
+= rdev
->desc
->min_dropout_uV
;
3073 current_supply_uV
= _regulator_get_voltage(rdev
->supply
->rdev
);
3074 if (current_supply_uV
< 0) {
3075 ret
= current_supply_uV
;
3079 supply_change_uV
= best_supply_uV
- current_supply_uV
;
3082 if (supply_change_uV
> 0) {
3083 ret
= regulator_set_voltage_unlocked(rdev
->supply
,
3084 best_supply_uV
, INT_MAX
, state
);
3086 dev_err(&rdev
->dev
, "Failed to increase supply voltage: %d\n",
3092 if (state
== PM_SUSPEND_ON
)
3093 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
3095 ret
= _regulator_do_set_suspend_voltage(rdev
, min_uV
,
3100 if (supply_change_uV
< 0) {
3101 ret
= regulator_set_voltage_unlocked(rdev
->supply
,
3102 best_supply_uV
, INT_MAX
, state
);
3104 dev_warn(&rdev
->dev
, "Failed to decrease supply voltage: %d\n",
3106 /* No need to fail here */
3113 voltage
->min_uV
= old_min_uV
;
3114 voltage
->max_uV
= old_max_uV
;
3120 * regulator_set_voltage - set regulator output voltage
3121 * @regulator: regulator source
3122 * @min_uV: Minimum required voltage in uV
3123 * @max_uV: Maximum acceptable voltage in uV
3125 * Sets a voltage regulator to the desired output voltage. This can be set
3126 * during any regulator state. IOW, regulator can be disabled or enabled.
3128 * If the regulator is enabled then the voltage will change to the new value
3129 * immediately otherwise if the regulator is disabled the regulator will
3130 * output at the new voltage when enabled.
3132 * NOTE: If the regulator is shared between several devices then the lowest
3133 * request voltage that meets the system constraints will be used.
3134 * Regulator system constraints must be set for this regulator before
3135 * calling this function otherwise this call will fail.
3137 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
3141 regulator_lock_supply(regulator
->rdev
);
3143 ret
= regulator_set_voltage_unlocked(regulator
, min_uV
, max_uV
,
3146 regulator_unlock_supply(regulator
->rdev
);
3150 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
3152 static inline int regulator_suspend_toggle(struct regulator_dev
*rdev
,
3153 suspend_state_t state
, bool en
)
3155 struct regulator_state
*rstate
;
3157 rstate
= regulator_get_suspend_state(rdev
, state
);
3161 if (!rstate
->changeable
)
3164 rstate
->enabled
= (en
) ? ENABLE_IN_SUSPEND
: DISABLE_IN_SUSPEND
;
3169 int regulator_suspend_enable(struct regulator_dev
*rdev
,
3170 suspend_state_t state
)
3172 return regulator_suspend_toggle(rdev
, state
, true);
3174 EXPORT_SYMBOL_GPL(regulator_suspend_enable
);
3176 int regulator_suspend_disable(struct regulator_dev
*rdev
,
3177 suspend_state_t state
)
3179 struct regulator
*regulator
;
3180 struct regulator_voltage
*voltage
;
3183 * if any consumer wants this regulator device keeping on in
3184 * suspend states, don't set it as disabled.
3186 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
3187 voltage
= ®ulator
->voltage
[state
];
3188 if (voltage
->min_uV
|| voltage
->max_uV
)
3192 return regulator_suspend_toggle(rdev
, state
, false);
3194 EXPORT_SYMBOL_GPL(regulator_suspend_disable
);
3196 static int _regulator_set_suspend_voltage(struct regulator
*regulator
,
3197 int min_uV
, int max_uV
,
3198 suspend_state_t state
)
3200 struct regulator_dev
*rdev
= regulator
->rdev
;
3201 struct regulator_state
*rstate
;
3203 rstate
= regulator_get_suspend_state(rdev
, state
);
3207 if (rstate
->min_uV
== rstate
->max_uV
) {
3208 rdev_err(rdev
, "The suspend voltage can't be changed!\n");
3212 return regulator_set_voltage_unlocked(regulator
, min_uV
, max_uV
, state
);
3215 int regulator_set_suspend_voltage(struct regulator
*regulator
, int min_uV
,
3216 int max_uV
, suspend_state_t state
)
3220 /* PM_SUSPEND_ON is handled by regulator_set_voltage() */
3221 if (regulator_check_states(state
) || state
== PM_SUSPEND_ON
)
3224 regulator_lock_supply(regulator
->rdev
);
3226 ret
= _regulator_set_suspend_voltage(regulator
, min_uV
,
3229 regulator_unlock_supply(regulator
->rdev
);
3233 EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage
);
3236 * regulator_set_voltage_time - get raise/fall time
3237 * @regulator: regulator source
3238 * @old_uV: starting voltage in microvolts
3239 * @new_uV: target voltage in microvolts
3241 * Provided with the starting and ending voltage, this function attempts to
3242 * calculate the time in microseconds required to rise or fall to this new
3245 int regulator_set_voltage_time(struct regulator
*regulator
,
3246 int old_uV
, int new_uV
)
3248 struct regulator_dev
*rdev
= regulator
->rdev
;
3249 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3255 if (ops
->set_voltage_time
)
3256 return ops
->set_voltage_time(rdev
, old_uV
, new_uV
);
3257 else if (!ops
->set_voltage_time_sel
)
3258 return _regulator_set_voltage_time(rdev
, old_uV
, new_uV
);
3260 /* Currently requires operations to do this */
3261 if (!ops
->list_voltage
|| !rdev
->desc
->n_voltages
)
3264 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
3265 /* We only look for exact voltage matches here */
3266 voltage
= regulator_list_voltage(regulator
, i
);
3271 if (voltage
== old_uV
)
3273 if (voltage
== new_uV
)
3277 if (old_sel
< 0 || new_sel
< 0)
3280 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
3282 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
3285 * regulator_set_voltage_time_sel - get raise/fall time
3286 * @rdev: regulator source device
3287 * @old_selector: selector for starting voltage
3288 * @new_selector: selector for target voltage
3290 * Provided with the starting and target voltage selectors, this function
3291 * returns time in microseconds required to rise or fall to this new voltage
3293 * Drivers providing ramp_delay in regulation_constraints can use this as their
3294 * set_voltage_time_sel() operation.
3296 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
3297 unsigned int old_selector
,
3298 unsigned int new_selector
)
3300 int old_volt
, new_volt
;
3303 if (!rdev
->desc
->ops
->list_voltage
)
3306 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
3307 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
3309 if (rdev
->desc
->ops
->set_voltage_time
)
3310 return rdev
->desc
->ops
->set_voltage_time(rdev
, old_volt
,
3313 return _regulator_set_voltage_time(rdev
, old_volt
, new_volt
);
3315 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
3318 * regulator_sync_voltage - re-apply last regulator output voltage
3319 * @regulator: regulator source
3321 * Re-apply the last configured voltage. This is intended to be used
3322 * where some external control source the consumer is cooperating with
3323 * has caused the configured voltage to change.
3325 int regulator_sync_voltage(struct regulator
*regulator
)
3327 struct regulator_dev
*rdev
= regulator
->rdev
;
3328 struct regulator_voltage
*voltage
= ®ulator
->voltage
[PM_SUSPEND_ON
];
3329 int ret
, min_uV
, max_uV
;
3331 regulator_lock(rdev
);
3333 if (!rdev
->desc
->ops
->set_voltage
&&
3334 !rdev
->desc
->ops
->set_voltage_sel
) {
3339 /* This is only going to work if we've had a voltage configured. */
3340 if (!voltage
->min_uV
&& !voltage
->max_uV
) {
3345 min_uV
= voltage
->min_uV
;
3346 max_uV
= voltage
->max_uV
;
3348 /* This should be a paranoia check... */
3349 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
3353 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
, 0);
3357 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
3360 regulator_unlock(rdev
);
3363 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
3365 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
3370 if (rdev
->desc
->ops
->get_bypass
) {
3371 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypassed
);
3375 /* if bypassed the regulator must have a supply */
3376 if (!rdev
->supply
) {
3378 "bypassed regulator has no supply!\n");
3379 return -EPROBE_DEFER
;
3382 return _regulator_get_voltage(rdev
->supply
->rdev
);
3386 if (rdev
->desc
->ops
->get_voltage_sel
) {
3387 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
3390 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
3391 } else if (rdev
->desc
->ops
->get_voltage
) {
3392 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
3393 } else if (rdev
->desc
->ops
->list_voltage
) {
3394 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
3395 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
3396 ret
= rdev
->desc
->fixed_uV
;
3397 } else if (rdev
->supply
) {
3398 ret
= _regulator_get_voltage(rdev
->supply
->rdev
);
3405 return ret
- rdev
->constraints
->uV_offset
;
3409 * regulator_get_voltage - get regulator output voltage
3410 * @regulator: regulator source
3412 * This returns the current regulator voltage in uV.
3414 * NOTE: If the regulator is disabled it will return the voltage value. This
3415 * function should not be used to determine regulator state.
3417 int regulator_get_voltage(struct regulator
*regulator
)
3421 regulator_lock_supply(regulator
->rdev
);
3423 ret
= _regulator_get_voltage(regulator
->rdev
);
3425 regulator_unlock_supply(regulator
->rdev
);
3429 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
3432 * regulator_set_current_limit - set regulator output current limit
3433 * @regulator: regulator source
3434 * @min_uA: Minimum supported current in uA
3435 * @max_uA: Maximum supported current in uA
3437 * Sets current sink to the desired output current. This can be set during
3438 * any regulator state. IOW, regulator can be disabled or enabled.
3440 * If the regulator is enabled then the current will change to the new value
3441 * immediately otherwise if the regulator is disabled the regulator will
3442 * output at the new current when enabled.
3444 * NOTE: Regulator system constraints must be set for this regulator before
3445 * calling this function otherwise this call will fail.
3447 int regulator_set_current_limit(struct regulator
*regulator
,
3448 int min_uA
, int max_uA
)
3450 struct regulator_dev
*rdev
= regulator
->rdev
;
3453 regulator_lock(rdev
);
3456 if (!rdev
->desc
->ops
->set_current_limit
) {
3461 /* constraints check */
3462 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
3466 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
3468 regulator_unlock(rdev
);
3471 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
3473 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
3477 regulator_lock(rdev
);
3480 if (!rdev
->desc
->ops
->get_current_limit
) {
3485 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
3487 regulator_unlock(rdev
);
3492 * regulator_get_current_limit - get regulator output current
3493 * @regulator: regulator source
3495 * This returns the current supplied by the specified current sink in uA.
3497 * NOTE: If the regulator is disabled it will return the current value. This
3498 * function should not be used to determine regulator state.
3500 int regulator_get_current_limit(struct regulator
*regulator
)
3502 return _regulator_get_current_limit(regulator
->rdev
);
3504 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
3507 * regulator_set_mode - set regulator operating mode
3508 * @regulator: regulator source
3509 * @mode: operating mode - one of the REGULATOR_MODE constants
3511 * Set regulator operating mode to increase regulator efficiency or improve
3512 * regulation performance.
3514 * NOTE: Regulator system constraints must be set for this regulator before
3515 * calling this function otherwise this call will fail.
3517 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
3519 struct regulator_dev
*rdev
= regulator
->rdev
;
3521 int regulator_curr_mode
;
3523 regulator_lock(rdev
);
3526 if (!rdev
->desc
->ops
->set_mode
) {
3531 /* return if the same mode is requested */
3532 if (rdev
->desc
->ops
->get_mode
) {
3533 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
3534 if (regulator_curr_mode
== mode
) {
3540 /* constraints check */
3541 ret
= regulator_mode_constrain(rdev
, &mode
);
3545 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
3547 regulator_unlock(rdev
);
3550 EXPORT_SYMBOL_GPL(regulator_set_mode
);
3552 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
3556 regulator_lock(rdev
);
3559 if (!rdev
->desc
->ops
->get_mode
) {
3564 ret
= rdev
->desc
->ops
->get_mode(rdev
);
3566 regulator_unlock(rdev
);
3571 * regulator_get_mode - get regulator operating mode
3572 * @regulator: regulator source
3574 * Get the current regulator operating mode.
3576 unsigned int regulator_get_mode(struct regulator
*regulator
)
3578 return _regulator_get_mode(regulator
->rdev
);
3580 EXPORT_SYMBOL_GPL(regulator_get_mode
);
3582 static int _regulator_get_error_flags(struct regulator_dev
*rdev
,
3583 unsigned int *flags
)
3587 regulator_lock(rdev
);
3590 if (!rdev
->desc
->ops
->get_error_flags
) {
3595 ret
= rdev
->desc
->ops
->get_error_flags(rdev
, flags
);
3597 regulator_unlock(rdev
);
3602 * regulator_get_error_flags - get regulator error information
3603 * @regulator: regulator source
3604 * @flags: pointer to store error flags
3606 * Get the current regulator error information.
3608 int regulator_get_error_flags(struct regulator
*regulator
,
3609 unsigned int *flags
)
3611 return _regulator_get_error_flags(regulator
->rdev
, flags
);
3613 EXPORT_SYMBOL_GPL(regulator_get_error_flags
);
3616 * regulator_set_load - set regulator load
3617 * @regulator: regulator source
3618 * @uA_load: load current
3620 * Notifies the regulator core of a new device load. This is then used by
3621 * DRMS (if enabled by constraints) to set the most efficient regulator
3622 * operating mode for the new regulator loading.
3624 * Consumer devices notify their supply regulator of the maximum power
3625 * they will require (can be taken from device datasheet in the power
3626 * consumption tables) when they change operational status and hence power
3627 * state. Examples of operational state changes that can affect power
3628 * consumption are :-
3630 * o Device is opened / closed.
3631 * o Device I/O is about to begin or has just finished.
3632 * o Device is idling in between work.
3634 * This information is also exported via sysfs to userspace.
3636 * DRMS will sum the total requested load on the regulator and change
3637 * to the most efficient operating mode if platform constraints allow.
3639 * On error a negative errno is returned.
3641 int regulator_set_load(struct regulator
*regulator
, int uA_load
)
3643 struct regulator_dev
*rdev
= regulator
->rdev
;
3646 regulator_lock(rdev
);
3647 regulator
->uA_load
= uA_load
;
3648 ret
= drms_uA_update(rdev
);
3649 regulator_unlock(rdev
);
3653 EXPORT_SYMBOL_GPL(regulator_set_load
);
3656 * regulator_allow_bypass - allow the regulator to go into bypass mode
3658 * @regulator: Regulator to configure
3659 * @enable: enable or disable bypass mode
3661 * Allow the regulator to go into bypass mode if all other consumers
3662 * for the regulator also enable bypass mode and the machine
3663 * constraints allow this. Bypass mode means that the regulator is
3664 * simply passing the input directly to the output with no regulation.
3666 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3668 struct regulator_dev
*rdev
= regulator
->rdev
;
3671 if (!rdev
->desc
->ops
->set_bypass
)
3674 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_BYPASS
))
3677 regulator_lock(rdev
);
3679 if (enable
&& !regulator
->bypass
) {
3680 rdev
->bypass_count
++;
3682 if (rdev
->bypass_count
== rdev
->open_count
) {
3683 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3685 rdev
->bypass_count
--;
3688 } else if (!enable
&& regulator
->bypass
) {
3689 rdev
->bypass_count
--;
3691 if (rdev
->bypass_count
!= rdev
->open_count
) {
3692 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3694 rdev
->bypass_count
++;
3699 regulator
->bypass
= enable
;
3701 regulator_unlock(rdev
);
3705 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3708 * regulator_register_notifier - register regulator event notifier
3709 * @regulator: regulator source
3710 * @nb: notifier block
3712 * Register notifier block to receive regulator events.
3714 int regulator_register_notifier(struct regulator
*regulator
,
3715 struct notifier_block
*nb
)
3717 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3720 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3723 * regulator_unregister_notifier - unregister regulator event notifier
3724 * @regulator: regulator source
3725 * @nb: notifier block
3727 * Unregister regulator event notifier block.
3729 int regulator_unregister_notifier(struct regulator
*regulator
,
3730 struct notifier_block
*nb
)
3732 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3735 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3737 /* notify regulator consumers and downstream regulator consumers.
3738 * Note mutex must be held by caller.
3740 static int _notifier_call_chain(struct regulator_dev
*rdev
,
3741 unsigned long event
, void *data
)
3743 /* call rdev chain first */
3744 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3748 * regulator_bulk_get - get multiple regulator consumers
3750 * @dev: Device to supply
3751 * @num_consumers: Number of consumers to register
3752 * @consumers: Configuration of consumers; clients are stored here.
3754 * @return 0 on success, an errno on failure.
3756 * This helper function allows drivers to get several regulator
3757 * consumers in one operation. If any of the regulators cannot be
3758 * acquired then any regulators that were allocated will be freed
3759 * before returning to the caller.
3761 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3762 struct regulator_bulk_data
*consumers
)
3767 for (i
= 0; i
< num_consumers
; i
++)
3768 consumers
[i
].consumer
= NULL
;
3770 for (i
= 0; i
< num_consumers
; i
++) {
3771 consumers
[i
].consumer
= regulator_get(dev
,
3772 consumers
[i
].supply
);
3773 if (IS_ERR(consumers
[i
].consumer
)) {
3774 ret
= PTR_ERR(consumers
[i
].consumer
);
3775 dev_err(dev
, "Failed to get supply '%s': %d\n",
3776 consumers
[i
].supply
, ret
);
3777 consumers
[i
].consumer
= NULL
;
3786 regulator_put(consumers
[i
].consumer
);
3790 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3792 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3794 struct regulator_bulk_data
*bulk
= data
;
3796 bulk
->ret
= regulator_enable(bulk
->consumer
);
3800 * regulator_bulk_enable - enable multiple regulator consumers
3802 * @num_consumers: Number of consumers
3803 * @consumers: Consumer data; clients are stored here.
3804 * @return 0 on success, an errno on failure
3806 * This convenience API allows consumers to enable multiple regulator
3807 * clients in a single API call. If any consumers cannot be enabled
3808 * then any others that were enabled will be disabled again prior to
3811 int regulator_bulk_enable(int num_consumers
,
3812 struct regulator_bulk_data
*consumers
)
3814 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3818 for (i
= 0; i
< num_consumers
; i
++) {
3819 if (consumers
[i
].consumer
->always_on
)
3820 consumers
[i
].ret
= 0;
3822 async_schedule_domain(regulator_bulk_enable_async
,
3823 &consumers
[i
], &async_domain
);
3826 async_synchronize_full_domain(&async_domain
);
3828 /* If any consumer failed we need to unwind any that succeeded */
3829 for (i
= 0; i
< num_consumers
; i
++) {
3830 if (consumers
[i
].ret
!= 0) {
3831 ret
= consumers
[i
].ret
;
3839 for (i
= 0; i
< num_consumers
; i
++) {
3840 if (consumers
[i
].ret
< 0)
3841 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3844 regulator_disable(consumers
[i
].consumer
);
3849 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3852 * regulator_bulk_disable - disable multiple regulator consumers
3854 * @num_consumers: Number of consumers
3855 * @consumers: Consumer data; clients are stored here.
3856 * @return 0 on success, an errno on failure
3858 * This convenience API allows consumers to disable multiple regulator
3859 * clients in a single API call. If any consumers cannot be disabled
3860 * then any others that were disabled will be enabled again prior to
3863 int regulator_bulk_disable(int num_consumers
,
3864 struct regulator_bulk_data
*consumers
)
3869 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3870 ret
= regulator_disable(consumers
[i
].consumer
);
3878 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3879 for (++i
; i
< num_consumers
; ++i
) {
3880 r
= regulator_enable(consumers
[i
].consumer
);
3882 pr_err("Failed to re-enable %s: %d\n",
3883 consumers
[i
].supply
, r
);
3888 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3891 * regulator_bulk_force_disable - force disable multiple regulator consumers
3893 * @num_consumers: Number of consumers
3894 * @consumers: Consumer data; clients are stored here.
3895 * @return 0 on success, an errno on failure
3897 * This convenience API allows consumers to forcibly disable multiple regulator
3898 * clients in a single API call.
3899 * NOTE: This should be used for situations when device damage will
3900 * likely occur if the regulators are not disabled (e.g. over temp).
3901 * Although regulator_force_disable function call for some consumers can
3902 * return error numbers, the function is called for all consumers.
3904 int regulator_bulk_force_disable(int num_consumers
,
3905 struct regulator_bulk_data
*consumers
)
3910 for (i
= 0; i
< num_consumers
; i
++) {
3912 regulator_force_disable(consumers
[i
].consumer
);
3914 /* Store first error for reporting */
3915 if (consumers
[i
].ret
&& !ret
)
3916 ret
= consumers
[i
].ret
;
3921 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3924 * regulator_bulk_free - free multiple regulator consumers
3926 * @num_consumers: Number of consumers
3927 * @consumers: Consumer data; clients are stored here.
3929 * This convenience API allows consumers to free multiple regulator
3930 * clients in a single API call.
3932 void regulator_bulk_free(int num_consumers
,
3933 struct regulator_bulk_data
*consumers
)
3937 for (i
= 0; i
< num_consumers
; i
++) {
3938 regulator_put(consumers
[i
].consumer
);
3939 consumers
[i
].consumer
= NULL
;
3942 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3945 * regulator_notifier_call_chain - call regulator event notifier
3946 * @rdev: regulator source
3947 * @event: notifier block
3948 * @data: callback-specific data.
3950 * Called by regulator drivers to notify clients a regulator event has
3951 * occurred. We also notify regulator clients downstream.
3952 * Note lock must be held by caller.
3954 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3955 unsigned long event
, void *data
)
3957 lockdep_assert_held_once(&rdev
->mutex
);
3959 _notifier_call_chain(rdev
, event
, data
);
3963 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3966 * regulator_mode_to_status - convert a regulator mode into a status
3968 * @mode: Mode to convert
3970 * Convert a regulator mode into a status.
3972 int regulator_mode_to_status(unsigned int mode
)
3975 case REGULATOR_MODE_FAST
:
3976 return REGULATOR_STATUS_FAST
;
3977 case REGULATOR_MODE_NORMAL
:
3978 return REGULATOR_STATUS_NORMAL
;
3979 case REGULATOR_MODE_IDLE
:
3980 return REGULATOR_STATUS_IDLE
;
3981 case REGULATOR_MODE_STANDBY
:
3982 return REGULATOR_STATUS_STANDBY
;
3984 return REGULATOR_STATUS_UNDEFINED
;
3987 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3989 static struct attribute
*regulator_dev_attrs
[] = {
3990 &dev_attr_name
.attr
,
3991 &dev_attr_num_users
.attr
,
3992 &dev_attr_type
.attr
,
3993 &dev_attr_microvolts
.attr
,
3994 &dev_attr_microamps
.attr
,
3995 &dev_attr_opmode
.attr
,
3996 &dev_attr_state
.attr
,
3997 &dev_attr_status
.attr
,
3998 &dev_attr_bypass
.attr
,
3999 &dev_attr_requested_microamps
.attr
,
4000 &dev_attr_min_microvolts
.attr
,
4001 &dev_attr_max_microvolts
.attr
,
4002 &dev_attr_min_microamps
.attr
,
4003 &dev_attr_max_microamps
.attr
,
4004 &dev_attr_suspend_standby_state
.attr
,
4005 &dev_attr_suspend_mem_state
.attr
,
4006 &dev_attr_suspend_disk_state
.attr
,
4007 &dev_attr_suspend_standby_microvolts
.attr
,
4008 &dev_attr_suspend_mem_microvolts
.attr
,
4009 &dev_attr_suspend_disk_microvolts
.attr
,
4010 &dev_attr_suspend_standby_mode
.attr
,
4011 &dev_attr_suspend_mem_mode
.attr
,
4012 &dev_attr_suspend_disk_mode
.attr
,
4017 * To avoid cluttering sysfs (and memory) with useless state, only
4018 * create attributes that can be meaningfully displayed.
4020 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
4021 struct attribute
*attr
, int idx
)
4023 struct device
*dev
= kobj_to_dev(kobj
);
4024 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4025 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
4026 umode_t mode
= attr
->mode
;
4028 /* these three are always present */
4029 if (attr
== &dev_attr_name
.attr
||
4030 attr
== &dev_attr_num_users
.attr
||
4031 attr
== &dev_attr_type
.attr
)
4034 /* some attributes need specific methods to be displayed */
4035 if (attr
== &dev_attr_microvolts
.attr
) {
4036 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
4037 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
4038 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
4039 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
4044 if (attr
== &dev_attr_microamps
.attr
)
4045 return ops
->get_current_limit
? mode
: 0;
4047 if (attr
== &dev_attr_opmode
.attr
)
4048 return ops
->get_mode
? mode
: 0;
4050 if (attr
== &dev_attr_state
.attr
)
4051 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
4053 if (attr
== &dev_attr_status
.attr
)
4054 return ops
->get_status
? mode
: 0;
4056 if (attr
== &dev_attr_bypass
.attr
)
4057 return ops
->get_bypass
? mode
: 0;
4059 /* some attributes are type-specific */
4060 if (attr
== &dev_attr_requested_microamps
.attr
)
4061 return rdev
->desc
->type
== REGULATOR_CURRENT
? mode
: 0;
4063 /* constraints need specific supporting methods */
4064 if (attr
== &dev_attr_min_microvolts
.attr
||
4065 attr
== &dev_attr_max_microvolts
.attr
)
4066 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
4068 if (attr
== &dev_attr_min_microamps
.attr
||
4069 attr
== &dev_attr_max_microamps
.attr
)
4070 return ops
->set_current_limit
? mode
: 0;
4072 if (attr
== &dev_attr_suspend_standby_state
.attr
||
4073 attr
== &dev_attr_suspend_mem_state
.attr
||
4074 attr
== &dev_attr_suspend_disk_state
.attr
)
4077 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
4078 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
4079 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
4080 return ops
->set_suspend_voltage
? mode
: 0;
4082 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
4083 attr
== &dev_attr_suspend_mem_mode
.attr
||
4084 attr
== &dev_attr_suspend_disk_mode
.attr
)
4085 return ops
->set_suspend_mode
? mode
: 0;
4090 static const struct attribute_group regulator_dev_group
= {
4091 .attrs
= regulator_dev_attrs
,
4092 .is_visible
= regulator_attr_is_visible
,
4095 static const struct attribute_group
*regulator_dev_groups
[] = {
4096 ®ulator_dev_group
,
4100 static void regulator_dev_release(struct device
*dev
)
4102 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
4104 kfree(rdev
->constraints
);
4105 of_node_put(rdev
->dev
.of_node
);
4109 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
4111 struct device
*parent
= rdev
->dev
.parent
;
4112 const char *rname
= rdev_get_name(rdev
);
4113 char name
[NAME_MAX
];
4115 /* Avoid duplicate debugfs directory names */
4116 if (parent
&& rname
== rdev
->desc
->name
) {
4117 snprintf(name
, sizeof(name
), "%s-%s", dev_name(parent
),
4122 rdev
->debugfs
= debugfs_create_dir(rname
, debugfs_root
);
4123 if (!rdev
->debugfs
) {
4124 rdev_warn(rdev
, "Failed to create debugfs directory\n");
4128 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
4130 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
4132 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
4133 &rdev
->bypass_count
);
4136 static int regulator_register_resolve_supply(struct device
*dev
, void *data
)
4138 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4140 if (regulator_resolve_supply(rdev
))
4141 rdev_dbg(rdev
, "unable to resolve supply\n");
4146 static int regulator_fill_coupling_array(struct regulator_dev
*rdev
)
4148 struct coupling_desc
*c_desc
= &rdev
->coupling_desc
;
4149 int n_coupled
= c_desc
->n_coupled
;
4150 struct regulator_dev
*c_rdev
;
4153 for (i
= 1; i
< n_coupled
; i
++) {
4154 /* already resolved */
4155 if (c_desc
->coupled_rdevs
[i
])
4158 c_rdev
= of_parse_coupled_regulator(rdev
, i
- 1);
4161 c_desc
->coupled_rdevs
[i
] = c_rdev
;
4162 c_desc
->n_resolved
++;
4166 if (rdev
->coupling_desc
.n_resolved
< n_coupled
)
4172 static int regulator_register_fill_coupling_array(struct device
*dev
,
4175 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4177 if (!IS_ENABLED(CONFIG_OF
))
4180 if (regulator_fill_coupling_array(rdev
))
4181 rdev_dbg(rdev
, "unable to resolve coupling\n");
4186 static int regulator_resolve_coupling(struct regulator_dev
*rdev
)
4190 if (!IS_ENABLED(CONFIG_OF
))
4193 n_phandles
= of_get_n_coupled(rdev
);
4195 if (n_phandles
+ 1 > MAX_COUPLED
) {
4196 rdev_err(rdev
, "too many regulators coupled\n");
4201 * Every regulator should always have coupling descriptor filled with
4202 * at least pointer to itself.
4204 rdev
->coupling_desc
.coupled_rdevs
[0] = rdev
;
4205 rdev
->coupling_desc
.n_coupled
= n_phandles
+ 1;
4206 rdev
->coupling_desc
.n_resolved
++;
4208 /* regulator isn't coupled */
4209 if (n_phandles
== 0)
4212 /* regulator, which can't change its voltage, can't be coupled */
4213 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
4214 rdev_err(rdev
, "voltage operation not allowed\n");
4218 if (rdev
->constraints
->max_spread
<= 0) {
4219 rdev_err(rdev
, "wrong max_spread value\n");
4223 if (!of_check_coupling_data(rdev
))
4227 * After everything has been checked, try to fill rdevs array
4228 * with pointers to regulators parsed from device tree. If some
4229 * regulators are not registered yet, retry in late init call
4231 regulator_fill_coupling_array(rdev
);
4237 * regulator_register - register regulator
4238 * @regulator_desc: regulator to register
4239 * @cfg: runtime configuration for regulator
4241 * Called by regulator drivers to register a regulator.
4242 * Returns a valid pointer to struct regulator_dev on success
4243 * or an ERR_PTR() on error.
4245 struct regulator_dev
*
4246 regulator_register(const struct regulator_desc
*regulator_desc
,
4247 const struct regulator_config
*cfg
)
4249 const struct regulation_constraints
*constraints
= NULL
;
4250 const struct regulator_init_data
*init_data
;
4251 struct regulator_config
*config
= NULL
;
4252 static atomic_t regulator_no
= ATOMIC_INIT(-1);
4253 struct regulator_dev
*rdev
;
4257 if (regulator_desc
== NULL
|| cfg
== NULL
)
4258 return ERR_PTR(-EINVAL
);
4263 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
4264 return ERR_PTR(-EINVAL
);
4266 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
4267 regulator_desc
->type
!= REGULATOR_CURRENT
)
4268 return ERR_PTR(-EINVAL
);
4270 /* Only one of each should be implemented */
4271 WARN_ON(regulator_desc
->ops
->get_voltage
&&
4272 regulator_desc
->ops
->get_voltage_sel
);
4273 WARN_ON(regulator_desc
->ops
->set_voltage
&&
4274 regulator_desc
->ops
->set_voltage_sel
);
4276 /* If we're using selectors we must implement list_voltage. */
4277 if (regulator_desc
->ops
->get_voltage_sel
&&
4278 !regulator_desc
->ops
->list_voltage
) {
4279 return ERR_PTR(-EINVAL
);
4281 if (regulator_desc
->ops
->set_voltage_sel
&&
4282 !regulator_desc
->ops
->list_voltage
) {
4283 return ERR_PTR(-EINVAL
);
4286 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
4288 return ERR_PTR(-ENOMEM
);
4291 * Duplicate the config so the driver could override it after
4292 * parsing init data.
4294 config
= kmemdup(cfg
, sizeof(*cfg
), GFP_KERNEL
);
4295 if (config
== NULL
) {
4297 return ERR_PTR(-ENOMEM
);
4300 init_data
= regulator_of_get_init_data(dev
, regulator_desc
, config
,
4301 &rdev
->dev
.of_node
);
4303 init_data
= config
->init_data
;
4304 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
4307 mutex_init(&rdev
->mutex
);
4308 rdev
->reg_data
= config
->driver_data
;
4309 rdev
->owner
= regulator_desc
->owner
;
4310 rdev
->desc
= regulator_desc
;
4312 rdev
->regmap
= config
->regmap
;
4313 else if (dev_get_regmap(dev
, NULL
))
4314 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
4315 else if (dev
->parent
)
4316 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
4317 INIT_LIST_HEAD(&rdev
->consumer_list
);
4318 INIT_LIST_HEAD(&rdev
->list
);
4319 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
4320 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
4322 /* preform any regulator specific init */
4323 if (init_data
&& init_data
->regulator_init
) {
4324 ret
= init_data
->regulator_init(rdev
->reg_data
);
4329 if (config
->ena_gpiod
||
4330 ((config
->ena_gpio
|| config
->ena_gpio_initialized
) &&
4331 gpio_is_valid(config
->ena_gpio
))) {
4332 mutex_lock(®ulator_list_mutex
);
4333 ret
= regulator_ena_gpio_request(rdev
, config
);
4334 mutex_unlock(®ulator_list_mutex
);
4336 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
4337 config
->ena_gpio
, ret
);
4342 /* register with sysfs */
4343 rdev
->dev
.class = ®ulator_class
;
4344 rdev
->dev
.parent
= dev
;
4345 dev_set_name(&rdev
->dev
, "regulator.%lu",
4346 (unsigned long) atomic_inc_return(®ulator_no
));
4348 /* set regulator constraints */
4350 constraints
= &init_data
->constraints
;
4352 if (init_data
&& init_data
->supply_regulator
)
4353 rdev
->supply_name
= init_data
->supply_regulator
;
4354 else if (regulator_desc
->supply_name
)
4355 rdev
->supply_name
= regulator_desc
->supply_name
;
4358 * Attempt to resolve the regulator supply, if specified,
4359 * but don't return an error if we fail because we will try
4360 * to resolve it again later as more regulators are added.
4362 if (regulator_resolve_supply(rdev
))
4363 rdev_dbg(rdev
, "unable to resolve supply\n");
4365 ret
= set_machine_constraints(rdev
, constraints
);
4369 mutex_lock(®ulator_list_mutex
);
4370 ret
= regulator_resolve_coupling(rdev
);
4371 mutex_unlock(®ulator_list_mutex
);
4376 /* add consumers devices */
4378 mutex_lock(®ulator_list_mutex
);
4379 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
4380 ret
= set_consumer_device_supply(rdev
,
4381 init_data
->consumer_supplies
[i
].dev_name
,
4382 init_data
->consumer_supplies
[i
].supply
);
4384 mutex_unlock(®ulator_list_mutex
);
4385 dev_err(dev
, "Failed to set supply %s\n",
4386 init_data
->consumer_supplies
[i
].supply
);
4387 goto unset_supplies
;
4390 mutex_unlock(®ulator_list_mutex
);
4393 if (!rdev
->desc
->ops
->get_voltage
&&
4394 !rdev
->desc
->ops
->list_voltage
&&
4395 !rdev
->desc
->fixed_uV
)
4396 rdev
->is_switch
= true;
4398 dev_set_drvdata(&rdev
->dev
, rdev
);
4399 ret
= device_register(&rdev
->dev
);
4401 put_device(&rdev
->dev
);
4402 goto unset_supplies
;
4405 rdev_init_debugfs(rdev
);
4407 /* try to resolve regulators supply since a new one was registered */
4408 class_for_each_device(®ulator_class
, NULL
, NULL
,
4409 regulator_register_resolve_supply
);
4414 mutex_lock(®ulator_list_mutex
);
4415 unset_regulator_supplies(rdev
);
4416 mutex_unlock(®ulator_list_mutex
);
4418 kfree(rdev
->constraints
);
4419 mutex_lock(®ulator_list_mutex
);
4420 regulator_ena_gpio_free(rdev
);
4421 mutex_unlock(®ulator_list_mutex
);
4425 return ERR_PTR(ret
);
4427 EXPORT_SYMBOL_GPL(regulator_register
);
4430 * regulator_unregister - unregister regulator
4431 * @rdev: regulator to unregister
4433 * Called by regulator drivers to unregister a regulator.
4435 void regulator_unregister(struct regulator_dev
*rdev
)
4441 while (rdev
->use_count
--)
4442 regulator_disable(rdev
->supply
);
4443 regulator_put(rdev
->supply
);
4445 mutex_lock(®ulator_list_mutex
);
4446 debugfs_remove_recursive(rdev
->debugfs
);
4447 flush_work(&rdev
->disable_work
.work
);
4448 WARN_ON(rdev
->open_count
);
4449 unset_regulator_supplies(rdev
);
4450 list_del(&rdev
->list
);
4451 regulator_ena_gpio_free(rdev
);
4452 mutex_unlock(®ulator_list_mutex
);
4453 device_unregister(&rdev
->dev
);
4455 EXPORT_SYMBOL_GPL(regulator_unregister
);
4457 #ifdef CONFIG_SUSPEND
4458 static int _regulator_suspend(struct device
*dev
, void *data
)
4460 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4461 suspend_state_t
*state
= data
;
4464 regulator_lock(rdev
);
4465 ret
= suspend_set_state(rdev
, *state
);
4466 regulator_unlock(rdev
);
4472 * regulator_suspend - prepare regulators for system wide suspend
4473 * @state: system suspend state
4475 * Configure each regulator with it's suspend operating parameters for state.
4477 static int regulator_suspend(struct device
*dev
)
4479 suspend_state_t state
= pm_suspend_target_state
;
4481 return class_for_each_device(®ulator_class
, NULL
, &state
,
4482 _regulator_suspend
);
4485 static int _regulator_resume(struct device
*dev
, void *data
)
4488 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4489 suspend_state_t
*state
= data
;
4490 struct regulator_state
*rstate
;
4492 rstate
= regulator_get_suspend_state(rdev
, *state
);
4496 regulator_lock(rdev
);
4498 if (rdev
->desc
->ops
->resume
&&
4499 (rstate
->enabled
== ENABLE_IN_SUSPEND
||
4500 rstate
->enabled
== DISABLE_IN_SUSPEND
))
4501 ret
= rdev
->desc
->ops
->resume(rdev
);
4503 regulator_unlock(rdev
);
4508 static int regulator_resume(struct device
*dev
)
4510 suspend_state_t state
= pm_suspend_target_state
;
4512 return class_for_each_device(®ulator_class
, NULL
, &state
,
4516 #else /* !CONFIG_SUSPEND */
4518 #define regulator_suspend NULL
4519 #define regulator_resume NULL
4521 #endif /* !CONFIG_SUSPEND */
4524 static const struct dev_pm_ops __maybe_unused regulator_pm_ops
= {
4525 .suspend
= regulator_suspend
,
4526 .resume
= regulator_resume
,
4530 struct class regulator_class
= {
4531 .name
= "regulator",
4532 .dev_release
= regulator_dev_release
,
4533 .dev_groups
= regulator_dev_groups
,
4535 .pm
= ®ulator_pm_ops
,
4539 * regulator_has_full_constraints - the system has fully specified constraints
4541 * Calling this function will cause the regulator API to disable all
4542 * regulators which have a zero use count and don't have an always_on
4543 * constraint in a late_initcall.
4545 * The intention is that this will become the default behaviour in a
4546 * future kernel release so users are encouraged to use this facility
4549 void regulator_has_full_constraints(void)
4551 has_full_constraints
= 1;
4553 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
4556 * rdev_get_drvdata - get rdev regulator driver data
4559 * Get rdev regulator driver private data. This call can be used in the
4560 * regulator driver context.
4562 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
4564 return rdev
->reg_data
;
4566 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
4569 * regulator_get_drvdata - get regulator driver data
4570 * @regulator: regulator
4572 * Get regulator driver private data. This call can be used in the consumer
4573 * driver context when non API regulator specific functions need to be called.
4575 void *regulator_get_drvdata(struct regulator
*regulator
)
4577 return regulator
->rdev
->reg_data
;
4579 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
4582 * regulator_set_drvdata - set regulator driver data
4583 * @regulator: regulator
4586 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
4588 regulator
->rdev
->reg_data
= data
;
4590 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
4593 * regulator_get_id - get regulator ID
4596 int rdev_get_id(struct regulator_dev
*rdev
)
4598 return rdev
->desc
->id
;
4600 EXPORT_SYMBOL_GPL(rdev_get_id
);
4602 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
4606 EXPORT_SYMBOL_GPL(rdev_get_dev
);
4608 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
4610 return reg_init_data
->driver_data
;
4612 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
4614 #ifdef CONFIG_DEBUG_FS
4615 static int supply_map_show(struct seq_file
*sf
, void *data
)
4617 struct regulator_map
*map
;
4619 list_for_each_entry(map
, ®ulator_map_list
, list
) {
4620 seq_printf(sf
, "%s -> %s.%s\n",
4621 rdev_get_name(map
->regulator
), map
->dev_name
,
4628 static int supply_map_open(struct inode
*inode
, struct file
*file
)
4630 return single_open(file
, supply_map_show
, inode
->i_private
);
4634 static const struct file_operations supply_map_fops
= {
4635 #ifdef CONFIG_DEBUG_FS
4636 .open
= supply_map_open
,
4638 .llseek
= seq_lseek
,
4639 .release
= single_release
,
4643 #ifdef CONFIG_DEBUG_FS
4644 struct summary_data
{
4646 struct regulator_dev
*parent
;
4650 static void regulator_summary_show_subtree(struct seq_file
*s
,
4651 struct regulator_dev
*rdev
,
4654 static int regulator_summary_show_children(struct device
*dev
, void *data
)
4656 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4657 struct summary_data
*summary_data
= data
;
4659 if (rdev
->supply
&& rdev
->supply
->rdev
== summary_data
->parent
)
4660 regulator_summary_show_subtree(summary_data
->s
, rdev
,
4661 summary_data
->level
+ 1);
4666 static void regulator_summary_show_subtree(struct seq_file
*s
,
4667 struct regulator_dev
*rdev
,
4670 struct regulation_constraints
*c
;
4671 struct regulator
*consumer
;
4672 struct summary_data summary_data
;
4677 seq_printf(s
, "%*s%-*s %3d %4d %6d ",
4679 30 - level
* 3, rdev_get_name(rdev
),
4680 rdev
->use_count
, rdev
->open_count
, rdev
->bypass_count
);
4682 seq_printf(s
, "%5dmV ", _regulator_get_voltage(rdev
) / 1000);
4683 seq_printf(s
, "%5dmA ", _regulator_get_current_limit(rdev
) / 1000);
4685 c
= rdev
->constraints
;
4687 switch (rdev
->desc
->type
) {
4688 case REGULATOR_VOLTAGE
:
4689 seq_printf(s
, "%5dmV %5dmV ",
4690 c
->min_uV
/ 1000, c
->max_uV
/ 1000);
4692 case REGULATOR_CURRENT
:
4693 seq_printf(s
, "%5dmA %5dmA ",
4694 c
->min_uA
/ 1000, c
->max_uA
/ 1000);
4701 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
) {
4702 if (consumer
->dev
&& consumer
->dev
->class == ®ulator_class
)
4705 seq_printf(s
, "%*s%-*s ",
4706 (level
+ 1) * 3 + 1, "",
4707 30 - (level
+ 1) * 3,
4708 consumer
->dev
? dev_name(consumer
->dev
) : "deviceless");
4710 switch (rdev
->desc
->type
) {
4711 case REGULATOR_VOLTAGE
:
4712 seq_printf(s
, "%37dmV %5dmV",
4713 consumer
->voltage
[PM_SUSPEND_ON
].min_uV
/ 1000,
4714 consumer
->voltage
[PM_SUSPEND_ON
].max_uV
/ 1000);
4716 case REGULATOR_CURRENT
:
4724 summary_data
.level
= level
;
4725 summary_data
.parent
= rdev
;
4727 class_for_each_device(®ulator_class
, NULL
, &summary_data
,
4728 regulator_summary_show_children
);
4731 static int regulator_summary_show_roots(struct device
*dev
, void *data
)
4733 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4734 struct seq_file
*s
= data
;
4737 regulator_summary_show_subtree(s
, rdev
, 0);
4742 static int regulator_summary_show(struct seq_file
*s
, void *data
)
4744 seq_puts(s
, " regulator use open bypass voltage current min max\n");
4745 seq_puts(s
, "-------------------------------------------------------------------------------\n");
4747 class_for_each_device(®ulator_class
, NULL
, s
,
4748 regulator_summary_show_roots
);
4753 static int regulator_summary_open(struct inode
*inode
, struct file
*file
)
4755 return single_open(file
, regulator_summary_show
, inode
->i_private
);
4759 static const struct file_operations regulator_summary_fops
= {
4760 #ifdef CONFIG_DEBUG_FS
4761 .open
= regulator_summary_open
,
4763 .llseek
= seq_lseek
,
4764 .release
= single_release
,
4768 static int __init
regulator_init(void)
4772 ret
= class_register(®ulator_class
);
4774 debugfs_root
= debugfs_create_dir("regulator", NULL
);
4776 pr_warn("regulator: Failed to create debugfs directory\n");
4778 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
4781 debugfs_create_file("regulator_summary", 0444, debugfs_root
,
4782 NULL
, ®ulator_summary_fops
);
4784 regulator_dummy_init();
4789 /* init early to allow our consumers to complete system booting */
4790 core_initcall(regulator_init
);
4792 static int __init
regulator_late_cleanup(struct device
*dev
, void *data
)
4794 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4795 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
4796 struct regulation_constraints
*c
= rdev
->constraints
;
4799 if (c
&& c
->always_on
)
4802 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
))
4805 regulator_lock(rdev
);
4807 if (rdev
->use_count
)
4810 /* If we can't read the status assume it's on. */
4811 if (ops
->is_enabled
)
4812 enabled
= ops
->is_enabled(rdev
);
4819 if (have_full_constraints()) {
4820 /* We log since this may kill the system if it goes
4822 rdev_info(rdev
, "disabling\n");
4823 ret
= _regulator_do_disable(rdev
);
4825 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4827 /* The intention is that in future we will
4828 * assume that full constraints are provided
4829 * so warn even if we aren't going to do
4832 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4836 regulator_unlock(rdev
);
4841 static int __init
regulator_init_complete(void)
4844 * Since DT doesn't provide an idiomatic mechanism for
4845 * enabling full constraints and since it's much more natural
4846 * with DT to provide them just assume that a DT enabled
4847 * system has full constraints.
4849 if (of_have_populated_dt())
4850 has_full_constraints
= true;
4853 * Regulators may had failed to resolve their input supplies
4854 * when were registered, either because the input supply was
4855 * not registered yet or because its parent device was not
4856 * bound yet. So attempt to resolve the input supplies for
4857 * pending regulators before trying to disable unused ones.
4859 class_for_each_device(®ulator_class
, NULL
, NULL
,
4860 regulator_register_resolve_supply
);
4862 /* If we have a full configuration then disable any regulators
4863 * we have permission to change the status for and which are
4864 * not in use or always_on. This is effectively the default
4865 * for DT and ACPI as they have full constraints.
4867 class_for_each_device(®ulator_class
, NULL
, NULL
,
4868 regulator_late_cleanup
);
4870 class_for_each_device(®ulator_class
, NULL
, NULL
,
4871 regulator_register_fill_coupling_array
);
4875 late_initcall_sync(regulator_init_complete
);