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
;
61 static struct class regulator_class
;
64 * struct regulator_map
66 * Used to provide symbolic supply names to devices.
68 struct regulator_map
{
69 struct list_head list
;
70 const char *dev_name
; /* The dev_name() for the consumer */
72 struct regulator_dev
*regulator
;
76 * struct regulator_enable_gpio
78 * Management for shared enable GPIO pin
80 struct regulator_enable_gpio
{
81 struct list_head list
;
82 struct gpio_desc
*gpiod
;
83 u32 enable_count
; /* a number of enabled shared GPIO */
84 u32 request_count
; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert
:1;
89 * struct regulator_supply_alias
91 * Used to map lookups for a supply onto an alternative device.
93 struct regulator_supply_alias
{
94 struct list_head list
;
95 struct device
*src_dev
;
96 const char *src_supply
;
97 struct device
*alias_dev
;
98 const char *alias_supply
;
101 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
102 static int _regulator_disable(struct regulator_dev
*rdev
);
103 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
104 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
105 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
106 static int _notifier_call_chain(struct regulator_dev
*rdev
,
107 unsigned long event
, void *data
);
108 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
109 int min_uV
, int max_uV
);
110 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
112 const char *supply_name
);
113 static void _regulator_put(struct regulator
*regulator
);
115 static struct regulator_dev
*dev_to_rdev(struct device
*dev
)
117 return container_of(dev
, struct regulator_dev
, dev
);
120 static const char *rdev_get_name(struct regulator_dev
*rdev
)
122 if (rdev
->constraints
&& rdev
->constraints
->name
)
123 return rdev
->constraints
->name
;
124 else if (rdev
->desc
->name
)
125 return rdev
->desc
->name
;
130 static bool have_full_constraints(void)
132 return has_full_constraints
|| of_have_populated_dt();
135 static inline struct regulator_dev
*rdev_get_supply(struct regulator_dev
*rdev
)
137 if (rdev
&& rdev
->supply
)
138 return rdev
->supply
->rdev
;
144 * regulator_lock_supply - lock a regulator and its supplies
145 * @rdev: regulator source
147 static void regulator_lock_supply(struct regulator_dev
*rdev
)
151 for (i
= 0; rdev
; rdev
= rdev_get_supply(rdev
), i
++)
152 mutex_lock_nested(&rdev
->mutex
, i
);
156 * regulator_unlock_supply - unlock a regulator and its supplies
157 * @rdev: regulator source
159 static void regulator_unlock_supply(struct regulator_dev
*rdev
)
161 struct regulator
*supply
;
164 mutex_unlock(&rdev
->mutex
);
165 supply
= rdev
->supply
;
175 * of_get_regulator - get a regulator device node based on supply name
176 * @dev: Device pointer for the consumer (of regulator) device
177 * @supply: regulator supply name
179 * Extract the regulator device node corresponding to the supply name.
180 * returns the device node corresponding to the regulator if found, else
183 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
185 struct device_node
*regnode
= NULL
;
186 char prop_name
[32]; /* 32 is max size of property name */
188 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
190 snprintf(prop_name
, 32, "%s-supply", supply
);
191 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
194 dev_dbg(dev
, "Looking up %s property in node %s failed",
195 prop_name
, dev
->of_node
->full_name
);
201 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
203 if (!rdev
->constraints
)
206 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
212 /* Platform voltage constraint check */
213 static int regulator_check_voltage(struct regulator_dev
*rdev
,
214 int *min_uV
, int *max_uV
)
216 BUG_ON(*min_uV
> *max_uV
);
218 if (!rdev
->constraints
) {
219 rdev_err(rdev
, "no constraints\n");
222 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
223 rdev_err(rdev
, "voltage operation not allowed\n");
227 if (*max_uV
> rdev
->constraints
->max_uV
)
228 *max_uV
= rdev
->constraints
->max_uV
;
229 if (*min_uV
< rdev
->constraints
->min_uV
)
230 *min_uV
= rdev
->constraints
->min_uV
;
232 if (*min_uV
> *max_uV
) {
233 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
241 /* Make sure we select a voltage that suits the needs of all
242 * regulator consumers
244 static int regulator_check_consumers(struct regulator_dev
*rdev
,
245 int *min_uV
, int *max_uV
)
247 struct regulator
*regulator
;
249 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
251 * Assume consumers that didn't say anything are OK
252 * with anything in the constraint range.
254 if (!regulator
->min_uV
&& !regulator
->max_uV
)
257 if (*max_uV
> regulator
->max_uV
)
258 *max_uV
= regulator
->max_uV
;
259 if (*min_uV
< regulator
->min_uV
)
260 *min_uV
= regulator
->min_uV
;
263 if (*min_uV
> *max_uV
) {
264 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
272 /* current constraint check */
273 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
274 int *min_uA
, int *max_uA
)
276 BUG_ON(*min_uA
> *max_uA
);
278 if (!rdev
->constraints
) {
279 rdev_err(rdev
, "no constraints\n");
282 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
283 rdev_err(rdev
, "current operation not allowed\n");
287 if (*max_uA
> rdev
->constraints
->max_uA
)
288 *max_uA
= rdev
->constraints
->max_uA
;
289 if (*min_uA
< rdev
->constraints
->min_uA
)
290 *min_uA
= rdev
->constraints
->min_uA
;
292 if (*min_uA
> *max_uA
) {
293 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
301 /* operating mode constraint check */
302 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
305 case REGULATOR_MODE_FAST
:
306 case REGULATOR_MODE_NORMAL
:
307 case REGULATOR_MODE_IDLE
:
308 case REGULATOR_MODE_STANDBY
:
311 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
315 if (!rdev
->constraints
) {
316 rdev_err(rdev
, "no constraints\n");
319 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
320 rdev_err(rdev
, "mode operation not allowed\n");
324 /* The modes are bitmasks, the most power hungry modes having
325 * the lowest values. If the requested mode isn't supported
326 * try higher modes. */
328 if (rdev
->constraints
->valid_modes_mask
& *mode
)
336 /* dynamic regulator mode switching constraint check */
337 static int regulator_check_drms(struct regulator_dev
*rdev
)
339 if (!rdev
->constraints
) {
340 rdev_err(rdev
, "no constraints\n");
343 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
344 rdev_dbg(rdev
, "drms operation not allowed\n");
350 static ssize_t
regulator_uV_show(struct device
*dev
,
351 struct device_attribute
*attr
, char *buf
)
353 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
356 mutex_lock(&rdev
->mutex
);
357 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
358 mutex_unlock(&rdev
->mutex
);
362 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
364 static ssize_t
regulator_uA_show(struct device
*dev
,
365 struct device_attribute
*attr
, char *buf
)
367 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
369 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
371 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
373 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
376 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
378 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
380 static DEVICE_ATTR_RO(name
);
382 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
385 case REGULATOR_MODE_FAST
:
386 return sprintf(buf
, "fast\n");
387 case REGULATOR_MODE_NORMAL
:
388 return sprintf(buf
, "normal\n");
389 case REGULATOR_MODE_IDLE
:
390 return sprintf(buf
, "idle\n");
391 case REGULATOR_MODE_STANDBY
:
392 return sprintf(buf
, "standby\n");
394 return sprintf(buf
, "unknown\n");
397 static ssize_t
regulator_opmode_show(struct device
*dev
,
398 struct device_attribute
*attr
, char *buf
)
400 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
402 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
404 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
406 static ssize_t
regulator_print_state(char *buf
, int state
)
409 return sprintf(buf
, "enabled\n");
411 return sprintf(buf
, "disabled\n");
413 return sprintf(buf
, "unknown\n");
416 static ssize_t
regulator_state_show(struct device
*dev
,
417 struct device_attribute
*attr
, char *buf
)
419 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
422 mutex_lock(&rdev
->mutex
);
423 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
424 mutex_unlock(&rdev
->mutex
);
428 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
430 static ssize_t
regulator_status_show(struct device
*dev
,
431 struct device_attribute
*attr
, char *buf
)
433 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
437 status
= rdev
->desc
->ops
->get_status(rdev
);
442 case REGULATOR_STATUS_OFF
:
445 case REGULATOR_STATUS_ON
:
448 case REGULATOR_STATUS_ERROR
:
451 case REGULATOR_STATUS_FAST
:
454 case REGULATOR_STATUS_NORMAL
:
457 case REGULATOR_STATUS_IDLE
:
460 case REGULATOR_STATUS_STANDBY
:
463 case REGULATOR_STATUS_BYPASS
:
466 case REGULATOR_STATUS_UNDEFINED
:
473 return sprintf(buf
, "%s\n", label
);
475 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
477 static ssize_t
regulator_min_uA_show(struct device
*dev
,
478 struct device_attribute
*attr
, char *buf
)
480 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
482 if (!rdev
->constraints
)
483 return sprintf(buf
, "constraint not defined\n");
485 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
487 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
489 static ssize_t
regulator_max_uA_show(struct device
*dev
,
490 struct device_attribute
*attr
, char *buf
)
492 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
494 if (!rdev
->constraints
)
495 return sprintf(buf
, "constraint not defined\n");
497 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
499 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
501 static ssize_t
regulator_min_uV_show(struct device
*dev
,
502 struct device_attribute
*attr
, char *buf
)
504 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
506 if (!rdev
->constraints
)
507 return sprintf(buf
, "constraint not defined\n");
509 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
511 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
513 static ssize_t
regulator_max_uV_show(struct device
*dev
,
514 struct device_attribute
*attr
, char *buf
)
516 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
518 if (!rdev
->constraints
)
519 return sprintf(buf
, "constraint not defined\n");
521 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
523 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
525 static ssize_t
regulator_total_uA_show(struct device
*dev
,
526 struct device_attribute
*attr
, char *buf
)
528 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
529 struct regulator
*regulator
;
532 mutex_lock(&rdev
->mutex
);
533 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
534 uA
+= regulator
->uA_load
;
535 mutex_unlock(&rdev
->mutex
);
536 return sprintf(buf
, "%d\n", uA
);
538 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
540 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
543 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
544 return sprintf(buf
, "%d\n", rdev
->use_count
);
546 static DEVICE_ATTR_RO(num_users
);
548 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
551 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
553 switch (rdev
->desc
->type
) {
554 case REGULATOR_VOLTAGE
:
555 return sprintf(buf
, "voltage\n");
556 case REGULATOR_CURRENT
:
557 return sprintf(buf
, "current\n");
559 return sprintf(buf
, "unknown\n");
561 static DEVICE_ATTR_RO(type
);
563 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
564 struct device_attribute
*attr
, char *buf
)
566 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
568 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
570 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
571 regulator_suspend_mem_uV_show
, NULL
);
573 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
574 struct device_attribute
*attr
, char *buf
)
576 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
578 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
580 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
581 regulator_suspend_disk_uV_show
, NULL
);
583 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
584 struct device_attribute
*attr
, char *buf
)
586 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
588 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
590 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
591 regulator_suspend_standby_uV_show
, NULL
);
593 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
594 struct device_attribute
*attr
, char *buf
)
596 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
598 return regulator_print_opmode(buf
,
599 rdev
->constraints
->state_mem
.mode
);
601 static DEVICE_ATTR(suspend_mem_mode
, 0444,
602 regulator_suspend_mem_mode_show
, NULL
);
604 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
605 struct device_attribute
*attr
, char *buf
)
607 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
609 return regulator_print_opmode(buf
,
610 rdev
->constraints
->state_disk
.mode
);
612 static DEVICE_ATTR(suspend_disk_mode
, 0444,
613 regulator_suspend_disk_mode_show
, NULL
);
615 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
616 struct device_attribute
*attr
, char *buf
)
618 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
620 return regulator_print_opmode(buf
,
621 rdev
->constraints
->state_standby
.mode
);
623 static DEVICE_ATTR(suspend_standby_mode
, 0444,
624 regulator_suspend_standby_mode_show
, NULL
);
626 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
627 struct device_attribute
*attr
, char *buf
)
629 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
631 return regulator_print_state(buf
,
632 rdev
->constraints
->state_mem
.enabled
);
634 static DEVICE_ATTR(suspend_mem_state
, 0444,
635 regulator_suspend_mem_state_show
, NULL
);
637 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
638 struct device_attribute
*attr
, char *buf
)
640 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
642 return regulator_print_state(buf
,
643 rdev
->constraints
->state_disk
.enabled
);
645 static DEVICE_ATTR(suspend_disk_state
, 0444,
646 regulator_suspend_disk_state_show
, NULL
);
648 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
649 struct device_attribute
*attr
, char *buf
)
651 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
653 return regulator_print_state(buf
,
654 rdev
->constraints
->state_standby
.enabled
);
656 static DEVICE_ATTR(suspend_standby_state
, 0444,
657 regulator_suspend_standby_state_show
, NULL
);
659 static ssize_t
regulator_bypass_show(struct device
*dev
,
660 struct device_attribute
*attr
, char *buf
)
662 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
667 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
676 return sprintf(buf
, "%s\n", report
);
678 static DEVICE_ATTR(bypass
, 0444,
679 regulator_bypass_show
, NULL
);
681 /* Calculate the new optimum regulator operating mode based on the new total
682 * consumer load. All locks held by caller */
683 static int drms_uA_update(struct regulator_dev
*rdev
)
685 struct regulator
*sibling
;
686 int current_uA
= 0, output_uV
, input_uV
, err
;
689 lockdep_assert_held_once(&rdev
->mutex
);
692 * first check to see if we can set modes at all, otherwise just
693 * tell the consumer everything is OK.
695 err
= regulator_check_drms(rdev
);
699 if (!rdev
->desc
->ops
->get_optimum_mode
&&
700 !rdev
->desc
->ops
->set_load
)
703 if (!rdev
->desc
->ops
->set_mode
&&
704 !rdev
->desc
->ops
->set_load
)
707 /* get output voltage */
708 output_uV
= _regulator_get_voltage(rdev
);
709 if (output_uV
<= 0) {
710 rdev_err(rdev
, "invalid output voltage found\n");
714 /* get input voltage */
717 input_uV
= regulator_get_voltage(rdev
->supply
);
719 input_uV
= rdev
->constraints
->input_uV
;
721 rdev_err(rdev
, "invalid input voltage found\n");
725 /* calc total requested load */
726 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
727 current_uA
+= sibling
->uA_load
;
729 current_uA
+= rdev
->constraints
->system_load
;
731 if (rdev
->desc
->ops
->set_load
) {
732 /* set the optimum mode for our new total regulator load */
733 err
= rdev
->desc
->ops
->set_load(rdev
, current_uA
);
735 rdev_err(rdev
, "failed to set load %d\n", current_uA
);
737 /* now get the optimum mode for our new total regulator load */
738 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
739 output_uV
, current_uA
);
741 /* check the new mode is allowed */
742 err
= regulator_mode_constrain(rdev
, &mode
);
744 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
745 current_uA
, input_uV
, output_uV
);
749 err
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
751 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
757 static int suspend_set_state(struct regulator_dev
*rdev
,
758 struct regulator_state
*rstate
)
762 /* If we have no suspend mode configration don't set anything;
763 * only warn if the driver implements set_suspend_voltage or
764 * set_suspend_mode callback.
766 if (!rstate
->enabled
&& !rstate
->disabled
) {
767 if (rdev
->desc
->ops
->set_suspend_voltage
||
768 rdev
->desc
->ops
->set_suspend_mode
)
769 rdev_warn(rdev
, "No configuration\n");
773 if (rstate
->enabled
&& rstate
->disabled
) {
774 rdev_err(rdev
, "invalid configuration\n");
778 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
779 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
780 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
781 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
782 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
786 rdev_err(rdev
, "failed to enabled/disable\n");
790 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
791 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
793 rdev_err(rdev
, "failed to set voltage\n");
798 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
799 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
801 rdev_err(rdev
, "failed to set mode\n");
808 /* locks held by caller */
809 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
811 lockdep_assert_held_once(&rdev
->mutex
);
813 if (!rdev
->constraints
)
817 case PM_SUSPEND_STANDBY
:
818 return suspend_set_state(rdev
,
819 &rdev
->constraints
->state_standby
);
821 return suspend_set_state(rdev
,
822 &rdev
->constraints
->state_mem
);
824 return suspend_set_state(rdev
,
825 &rdev
->constraints
->state_disk
);
831 static void print_constraints(struct regulator_dev
*rdev
)
833 struct regulation_constraints
*constraints
= rdev
->constraints
;
835 size_t len
= sizeof(buf
) - 1;
839 if (constraints
->min_uV
&& constraints
->max_uV
) {
840 if (constraints
->min_uV
== constraints
->max_uV
)
841 count
+= scnprintf(buf
+ count
, len
- count
, "%d mV ",
842 constraints
->min_uV
/ 1000);
844 count
+= scnprintf(buf
+ count
, len
- count
,
846 constraints
->min_uV
/ 1000,
847 constraints
->max_uV
/ 1000);
850 if (!constraints
->min_uV
||
851 constraints
->min_uV
!= constraints
->max_uV
) {
852 ret
= _regulator_get_voltage(rdev
);
854 count
+= scnprintf(buf
+ count
, len
- count
,
855 "at %d mV ", ret
/ 1000);
858 if (constraints
->uV_offset
)
859 count
+= scnprintf(buf
+ count
, len
- count
, "%dmV offset ",
860 constraints
->uV_offset
/ 1000);
862 if (constraints
->min_uA
&& constraints
->max_uA
) {
863 if (constraints
->min_uA
== constraints
->max_uA
)
864 count
+= scnprintf(buf
+ count
, len
- count
, "%d mA ",
865 constraints
->min_uA
/ 1000);
867 count
+= scnprintf(buf
+ count
, len
- count
,
869 constraints
->min_uA
/ 1000,
870 constraints
->max_uA
/ 1000);
873 if (!constraints
->min_uA
||
874 constraints
->min_uA
!= constraints
->max_uA
) {
875 ret
= _regulator_get_current_limit(rdev
);
877 count
+= scnprintf(buf
+ count
, len
- count
,
878 "at %d mA ", ret
/ 1000);
881 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
882 count
+= scnprintf(buf
+ count
, len
- count
, "fast ");
883 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
884 count
+= scnprintf(buf
+ count
, len
- count
, "normal ");
885 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
886 count
+= scnprintf(buf
+ count
, len
- count
, "idle ");
887 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
888 count
+= scnprintf(buf
+ count
, len
- count
, "standby");
891 scnprintf(buf
, len
, "no parameters");
893 rdev_dbg(rdev
, "%s\n", buf
);
895 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
896 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
898 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
901 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
902 struct regulation_constraints
*constraints
)
904 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
907 /* do we need to apply the constraint voltage */
908 if (rdev
->constraints
->apply_uV
&&
909 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
) {
910 int target_min
, target_max
;
911 int current_uV
= _regulator_get_voltage(rdev
);
912 if (current_uV
< 0) {
914 "failed to get the current voltage(%d)\n",
920 * If we're below the minimum voltage move up to the
921 * minimum voltage, if we're above the maximum voltage
922 * then move down to the maximum.
924 target_min
= current_uV
;
925 target_max
= current_uV
;
927 if (current_uV
< rdev
->constraints
->min_uV
) {
928 target_min
= rdev
->constraints
->min_uV
;
929 target_max
= rdev
->constraints
->min_uV
;
932 if (current_uV
> rdev
->constraints
->max_uV
) {
933 target_min
= rdev
->constraints
->max_uV
;
934 target_max
= rdev
->constraints
->max_uV
;
937 if (target_min
!= current_uV
|| target_max
!= current_uV
) {
938 ret
= _regulator_do_set_voltage(
939 rdev
, target_min
, target_max
);
942 "failed to apply %d-%duV constraint(%d)\n",
943 target_min
, target_max
, ret
);
949 /* constrain machine-level voltage specs to fit
950 * the actual range supported by this regulator.
952 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
953 int count
= rdev
->desc
->n_voltages
;
955 int min_uV
= INT_MAX
;
956 int max_uV
= INT_MIN
;
957 int cmin
= constraints
->min_uV
;
958 int cmax
= constraints
->max_uV
;
960 /* it's safe to autoconfigure fixed-voltage supplies
961 and the constraints are used by list_voltage. */
962 if (count
== 1 && !cmin
) {
965 constraints
->min_uV
= cmin
;
966 constraints
->max_uV
= cmax
;
969 /* voltage constraints are optional */
970 if ((cmin
== 0) && (cmax
== 0))
973 /* else require explicit machine-level constraints */
974 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
975 rdev_err(rdev
, "invalid voltage constraints\n");
979 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
980 for (i
= 0; i
< count
; i
++) {
983 value
= ops
->list_voltage(rdev
, i
);
987 /* maybe adjust [min_uV..max_uV] */
988 if (value
>= cmin
&& value
< min_uV
)
990 if (value
<= cmax
&& value
> max_uV
)
994 /* final: [min_uV..max_uV] valid iff constraints valid */
995 if (max_uV
< min_uV
) {
997 "unsupportable voltage constraints %u-%uuV\n",
1002 /* use regulator's subset of machine constraints */
1003 if (constraints
->min_uV
< min_uV
) {
1004 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
1005 constraints
->min_uV
, min_uV
);
1006 constraints
->min_uV
= min_uV
;
1008 if (constraints
->max_uV
> max_uV
) {
1009 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
1010 constraints
->max_uV
, max_uV
);
1011 constraints
->max_uV
= max_uV
;
1018 static int machine_constraints_current(struct regulator_dev
*rdev
,
1019 struct regulation_constraints
*constraints
)
1021 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1024 if (!constraints
->min_uA
&& !constraints
->max_uA
)
1027 if (constraints
->min_uA
> constraints
->max_uA
) {
1028 rdev_err(rdev
, "Invalid current constraints\n");
1032 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
1033 rdev_warn(rdev
, "Operation of current configuration missing\n");
1037 /* Set regulator current in constraints range */
1038 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
1039 constraints
->max_uA
);
1041 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
1048 static int _regulator_do_enable(struct regulator_dev
*rdev
);
1051 * set_machine_constraints - sets regulator constraints
1052 * @rdev: regulator source
1053 * @constraints: constraints to apply
1055 * Allows platform initialisation code to define and constrain
1056 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1057 * Constraints *must* be set by platform code in order for some
1058 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1061 static int set_machine_constraints(struct regulator_dev
*rdev
,
1062 const struct regulation_constraints
*constraints
)
1065 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1068 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
1071 rdev
->constraints
= kzalloc(sizeof(*constraints
),
1073 if (!rdev
->constraints
)
1076 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
1080 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
1084 if (rdev
->constraints
->ilim_uA
&& ops
->set_input_current_limit
) {
1085 ret
= ops
->set_input_current_limit(rdev
,
1086 rdev
->constraints
->ilim_uA
);
1088 rdev_err(rdev
, "failed to set input limit\n");
1093 /* do we need to setup our suspend state */
1094 if (rdev
->constraints
->initial_state
) {
1095 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
1097 rdev_err(rdev
, "failed to set suspend state\n");
1102 if (rdev
->constraints
->initial_mode
) {
1103 if (!ops
->set_mode
) {
1104 rdev_err(rdev
, "no set_mode operation\n");
1108 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1110 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1115 /* If the constraints say the regulator should be on at this point
1116 * and we have control then make sure it is enabled.
1118 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
1119 ret
= _regulator_do_enable(rdev
);
1120 if (ret
< 0 && ret
!= -EINVAL
) {
1121 rdev_err(rdev
, "failed to enable\n");
1126 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1127 && ops
->set_ramp_delay
) {
1128 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1130 rdev_err(rdev
, "failed to set ramp_delay\n");
1135 if (rdev
->constraints
->pull_down
&& ops
->set_pull_down
) {
1136 ret
= ops
->set_pull_down(rdev
);
1138 rdev_err(rdev
, "failed to set pull down\n");
1143 if (rdev
->constraints
->soft_start
&& ops
->set_soft_start
) {
1144 ret
= ops
->set_soft_start(rdev
);
1146 rdev_err(rdev
, "failed to set soft start\n");
1151 if (rdev
->constraints
->over_current_protection
1152 && ops
->set_over_current_protection
) {
1153 ret
= ops
->set_over_current_protection(rdev
);
1155 rdev_err(rdev
, "failed to set over current protection\n");
1160 if (rdev
->constraints
->active_discharge
&& ops
->set_active_discharge
) {
1161 bool ad_state
= (rdev
->constraints
->active_discharge
==
1162 REGULATOR_ACTIVE_DISCHARGE_ENABLE
) ? true : false;
1164 ret
= ops
->set_active_discharge(rdev
, ad_state
);
1166 rdev_err(rdev
, "failed to set active discharge\n");
1171 print_constraints(rdev
);
1176 * set_supply - set regulator supply regulator
1177 * @rdev: regulator name
1178 * @supply_rdev: supply regulator name
1180 * Called by platform initialisation code to set the supply regulator for this
1181 * regulator. This ensures that a regulators supply will also be enabled by the
1182 * core if it's child is enabled.
1184 static int set_supply(struct regulator_dev
*rdev
,
1185 struct regulator_dev
*supply_rdev
)
1189 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1191 if (!try_module_get(supply_rdev
->owner
))
1194 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1195 if (rdev
->supply
== NULL
) {
1199 supply_rdev
->open_count
++;
1205 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1206 * @rdev: regulator source
1207 * @consumer_dev_name: dev_name() string for device supply applies to
1208 * @supply: symbolic name for supply
1210 * Allows platform initialisation code to map physical regulator
1211 * sources to symbolic names for supplies for use by devices. Devices
1212 * should use these symbolic names to request regulators, avoiding the
1213 * need to provide board-specific regulator names as platform data.
1215 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1216 const char *consumer_dev_name
,
1219 struct regulator_map
*node
;
1225 if (consumer_dev_name
!= NULL
)
1230 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1231 if (node
->dev_name
&& consumer_dev_name
) {
1232 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1234 } else if (node
->dev_name
|| consumer_dev_name
) {
1238 if (strcmp(node
->supply
, supply
) != 0)
1241 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1243 dev_name(&node
->regulator
->dev
),
1244 node
->regulator
->desc
->name
,
1246 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1250 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1254 node
->regulator
= rdev
;
1255 node
->supply
= supply
;
1258 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1259 if (node
->dev_name
== NULL
) {
1265 list_add(&node
->list
, ®ulator_map_list
);
1269 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1271 struct regulator_map
*node
, *n
;
1273 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1274 if (rdev
== node
->regulator
) {
1275 list_del(&node
->list
);
1276 kfree(node
->dev_name
);
1282 #define REG_STR_SIZE 64
1284 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1286 const char *supply_name
)
1288 struct regulator
*regulator
;
1289 char buf
[REG_STR_SIZE
];
1292 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1293 if (regulator
== NULL
)
1296 mutex_lock(&rdev
->mutex
);
1297 regulator
->rdev
= rdev
;
1298 list_add(®ulator
->list
, &rdev
->consumer_list
);
1301 regulator
->dev
= dev
;
1303 /* Add a link to the device sysfs entry */
1304 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1305 dev
->kobj
.name
, supply_name
);
1306 if (size
>= REG_STR_SIZE
)
1309 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1310 if (regulator
->supply_name
== NULL
)
1313 err
= sysfs_create_link_nowarn(&rdev
->dev
.kobj
, &dev
->kobj
,
1316 rdev_dbg(rdev
, "could not add device link %s err %d\n",
1317 dev
->kobj
.name
, err
);
1321 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1322 if (regulator
->supply_name
== NULL
)
1326 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1328 if (!regulator
->debugfs
) {
1329 rdev_dbg(rdev
, "Failed to create debugfs directory\n");
1331 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1332 ®ulator
->uA_load
);
1333 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1334 ®ulator
->min_uV
);
1335 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1336 ®ulator
->max_uV
);
1340 * Check now if the regulator is an always on regulator - if
1341 * it is then we don't need to do nearly so much work for
1342 * enable/disable calls.
1344 if (!_regulator_can_change_status(rdev
) &&
1345 _regulator_is_enabled(rdev
))
1346 regulator
->always_on
= true;
1348 mutex_unlock(&rdev
->mutex
);
1351 list_del(®ulator
->list
);
1353 mutex_unlock(&rdev
->mutex
);
1357 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1359 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1360 return rdev
->constraints
->enable_time
;
1361 if (!rdev
->desc
->ops
->enable_time
)
1362 return rdev
->desc
->enable_time
;
1363 return rdev
->desc
->ops
->enable_time(rdev
);
1366 static struct regulator_supply_alias
*regulator_find_supply_alias(
1367 struct device
*dev
, const char *supply
)
1369 struct regulator_supply_alias
*map
;
1371 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1372 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1378 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1380 struct regulator_supply_alias
*map
;
1382 map
= regulator_find_supply_alias(*dev
, *supply
);
1384 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1385 *supply
, map
->alias_supply
,
1386 dev_name(map
->alias_dev
));
1387 *dev
= map
->alias_dev
;
1388 *supply
= map
->alias_supply
;
1392 static int of_node_match(struct device
*dev
, const void *data
)
1394 return dev
->of_node
== data
;
1397 static struct regulator_dev
*of_find_regulator_by_node(struct device_node
*np
)
1401 dev
= class_find_device(®ulator_class
, NULL
, np
, of_node_match
);
1403 return dev
? dev_to_rdev(dev
) : NULL
;
1406 static int regulator_match(struct device
*dev
, const void *data
)
1408 struct regulator_dev
*r
= dev_to_rdev(dev
);
1410 return strcmp(rdev_get_name(r
), data
) == 0;
1413 static struct regulator_dev
*regulator_lookup_by_name(const char *name
)
1417 dev
= class_find_device(®ulator_class
, NULL
, name
, regulator_match
);
1419 return dev
? dev_to_rdev(dev
) : NULL
;
1423 * regulator_dev_lookup - lookup a regulator device.
1424 * @dev: device for regulator "consumer".
1425 * @supply: Supply name or regulator ID.
1426 * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if
1427 * lookup could succeed in the future.
1429 * If successful, returns a struct regulator_dev that corresponds to the name
1430 * @supply and with the embedded struct device refcount incremented by one,
1431 * or NULL on failure. The refcount must be dropped by calling put_device().
1433 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1437 struct regulator_dev
*r
;
1438 struct device_node
*node
;
1439 struct regulator_map
*map
;
1440 const char *devname
= NULL
;
1442 regulator_supply_alias(&dev
, &supply
);
1444 /* first do a dt based lookup */
1445 if (dev
&& dev
->of_node
) {
1446 node
= of_get_regulator(dev
, supply
);
1448 r
= of_find_regulator_by_node(node
);
1451 *ret
= -EPROBE_DEFER
;
1455 * If we couldn't even get the node then it's
1456 * not just that the device didn't register
1457 * yet, there's no node and we'll never
1464 /* if not found, try doing it non-dt way */
1466 devname
= dev_name(dev
);
1468 r
= regulator_lookup_by_name(supply
);
1472 mutex_lock(®ulator_list_mutex
);
1473 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1474 /* If the mapping has a device set up it must match */
1475 if (map
->dev_name
&&
1476 (!devname
|| strcmp(map
->dev_name
, devname
)))
1479 if (strcmp(map
->supply
, supply
) == 0 &&
1480 get_device(&map
->regulator
->dev
)) {
1481 mutex_unlock(®ulator_list_mutex
);
1482 return map
->regulator
;
1485 mutex_unlock(®ulator_list_mutex
);
1490 static int regulator_resolve_supply(struct regulator_dev
*rdev
)
1492 struct regulator_dev
*r
;
1493 struct device
*dev
= rdev
->dev
.parent
;
1496 /* No supply to resovle? */
1497 if (!rdev
->supply_name
)
1500 /* Supply already resolved? */
1504 r
= regulator_dev_lookup(dev
, rdev
->supply_name
, &ret
);
1506 if (ret
== -ENODEV
) {
1508 * No supply was specified for this regulator and
1509 * there will never be one.
1514 /* Did the lookup explicitly defer for us? */
1515 if (ret
== -EPROBE_DEFER
)
1518 if (have_full_constraints()) {
1519 r
= dummy_regulator_rdev
;
1520 get_device(&r
->dev
);
1522 dev_err(dev
, "Failed to resolve %s-supply for %s\n",
1523 rdev
->supply_name
, rdev
->desc
->name
);
1524 return -EPROBE_DEFER
;
1528 /* Recursively resolve the supply of the supply */
1529 ret
= regulator_resolve_supply(r
);
1531 put_device(&r
->dev
);
1535 ret
= set_supply(rdev
, r
);
1537 put_device(&r
->dev
);
1541 /* Cascade always-on state to supply */
1542 if (_regulator_is_enabled(rdev
) && rdev
->supply
) {
1543 ret
= regulator_enable(rdev
->supply
);
1545 _regulator_put(rdev
->supply
);
1553 /* Internal regulator request function */
1554 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1555 bool exclusive
, bool allow_dummy
)
1557 struct regulator_dev
*rdev
;
1558 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1559 const char *devname
= NULL
;
1563 pr_err("get() with no identifier\n");
1564 return ERR_PTR(-EINVAL
);
1568 devname
= dev_name(dev
);
1570 if (have_full_constraints())
1573 ret
= -EPROBE_DEFER
;
1575 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1579 regulator
= ERR_PTR(ret
);
1582 * If we have return value from dev_lookup fail, we do not expect to
1583 * succeed, so, quit with appropriate error value
1585 if (ret
&& ret
!= -ENODEV
)
1589 devname
= "deviceless";
1592 * Assume that a regulator is physically present and enabled
1593 * even if it isn't hooked up and just provide a dummy.
1595 if (have_full_constraints() && allow_dummy
) {
1596 pr_warn("%s supply %s not found, using dummy regulator\n",
1599 rdev
= dummy_regulator_rdev
;
1600 get_device(&rdev
->dev
);
1602 /* Don't log an error when called from regulator_get_optional() */
1603 } else if (!have_full_constraints() || exclusive
) {
1604 dev_warn(dev
, "dummy supplies not allowed\n");
1610 if (rdev
->exclusive
) {
1611 regulator
= ERR_PTR(-EPERM
);
1612 put_device(&rdev
->dev
);
1616 if (exclusive
&& rdev
->open_count
) {
1617 regulator
= ERR_PTR(-EBUSY
);
1618 put_device(&rdev
->dev
);
1622 ret
= regulator_resolve_supply(rdev
);
1624 regulator
= ERR_PTR(ret
);
1625 put_device(&rdev
->dev
);
1629 if (!try_module_get(rdev
->owner
)) {
1630 put_device(&rdev
->dev
);
1634 regulator
= create_regulator(rdev
, dev
, id
);
1635 if (regulator
== NULL
) {
1636 regulator
= ERR_PTR(-ENOMEM
);
1637 put_device(&rdev
->dev
);
1638 module_put(rdev
->owner
);
1644 rdev
->exclusive
= 1;
1646 ret
= _regulator_is_enabled(rdev
);
1648 rdev
->use_count
= 1;
1650 rdev
->use_count
= 0;
1657 * regulator_get - lookup and obtain a reference to a regulator.
1658 * @dev: device for regulator "consumer"
1659 * @id: Supply name or regulator ID.
1661 * Returns a struct regulator corresponding to the regulator producer,
1662 * or IS_ERR() condition containing errno.
1664 * Use of supply names configured via regulator_set_device_supply() is
1665 * strongly encouraged. It is recommended that the supply name used
1666 * should match the name used for the supply and/or the relevant
1667 * device pins in the datasheet.
1669 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1671 return _regulator_get(dev
, id
, false, true);
1673 EXPORT_SYMBOL_GPL(regulator_get
);
1676 * regulator_get_exclusive - obtain exclusive access to a regulator.
1677 * @dev: device for regulator "consumer"
1678 * @id: Supply name or regulator ID.
1680 * Returns a struct regulator corresponding to the regulator producer,
1681 * or IS_ERR() condition containing errno. Other consumers will be
1682 * unable to obtain this regulator while this reference is held and the
1683 * use count for the regulator will be initialised to reflect the current
1684 * state of the regulator.
1686 * This is intended for use by consumers which cannot tolerate shared
1687 * use of the regulator such as those which need to force the
1688 * regulator off for correct operation of the hardware they are
1691 * Use of supply names configured via regulator_set_device_supply() is
1692 * strongly encouraged. It is recommended that the supply name used
1693 * should match the name used for the supply and/or the relevant
1694 * device pins in the datasheet.
1696 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1698 return _regulator_get(dev
, id
, true, false);
1700 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1703 * regulator_get_optional - obtain optional access to a regulator.
1704 * @dev: device for regulator "consumer"
1705 * @id: Supply name or regulator ID.
1707 * Returns a struct regulator corresponding to the regulator producer,
1708 * or IS_ERR() condition containing errno.
1710 * This is intended for use by consumers for devices which can have
1711 * some supplies unconnected in normal use, such as some MMC devices.
1712 * It can allow the regulator core to provide stub supplies for other
1713 * supplies requested using normal regulator_get() calls without
1714 * disrupting the operation of drivers that can handle absent
1717 * Use of supply names configured via regulator_set_device_supply() is
1718 * strongly encouraged. It is recommended that the supply name used
1719 * should match the name used for the supply and/or the relevant
1720 * device pins in the datasheet.
1722 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1724 return _regulator_get(dev
, id
, false, false);
1726 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1728 /* regulator_list_mutex lock held by regulator_put() */
1729 static void _regulator_put(struct regulator
*regulator
)
1731 struct regulator_dev
*rdev
;
1733 if (IS_ERR_OR_NULL(regulator
))
1736 lockdep_assert_held_once(®ulator_list_mutex
);
1738 rdev
= regulator
->rdev
;
1740 debugfs_remove_recursive(regulator
->debugfs
);
1742 /* remove any sysfs entries */
1744 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1745 mutex_lock(&rdev
->mutex
);
1746 list_del(®ulator
->list
);
1749 rdev
->exclusive
= 0;
1750 put_device(&rdev
->dev
);
1751 mutex_unlock(&rdev
->mutex
);
1753 kfree(regulator
->supply_name
);
1756 module_put(rdev
->owner
);
1760 * regulator_put - "free" the regulator source
1761 * @regulator: regulator source
1763 * Note: drivers must ensure that all regulator_enable calls made on this
1764 * regulator source are balanced by regulator_disable calls prior to calling
1767 void regulator_put(struct regulator
*regulator
)
1769 mutex_lock(®ulator_list_mutex
);
1770 _regulator_put(regulator
);
1771 mutex_unlock(®ulator_list_mutex
);
1773 EXPORT_SYMBOL_GPL(regulator_put
);
1776 * regulator_register_supply_alias - Provide device alias for supply lookup
1778 * @dev: device that will be given as the regulator "consumer"
1779 * @id: Supply name or regulator ID
1780 * @alias_dev: device that should be used to lookup the supply
1781 * @alias_id: Supply name or regulator ID that should be used to lookup the
1784 * All lookups for id on dev will instead be conducted for alias_id on
1787 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1788 struct device
*alias_dev
,
1789 const char *alias_id
)
1791 struct regulator_supply_alias
*map
;
1793 map
= regulator_find_supply_alias(dev
, id
);
1797 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1802 map
->src_supply
= id
;
1803 map
->alias_dev
= alias_dev
;
1804 map
->alias_supply
= alias_id
;
1806 list_add(&map
->list
, ®ulator_supply_alias_list
);
1808 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1809 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1813 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1816 * regulator_unregister_supply_alias - Remove device alias
1818 * @dev: device that will be given as the regulator "consumer"
1819 * @id: Supply name or regulator ID
1821 * Remove a lookup alias if one exists for id on dev.
1823 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1825 struct regulator_supply_alias
*map
;
1827 map
= regulator_find_supply_alias(dev
, id
);
1829 list_del(&map
->list
);
1833 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1836 * regulator_bulk_register_supply_alias - register multiple aliases
1838 * @dev: device that will be given as the regulator "consumer"
1839 * @id: List of supply names or regulator IDs
1840 * @alias_dev: device that should be used to lookup the supply
1841 * @alias_id: List of supply names or regulator IDs that should be used to
1843 * @num_id: Number of aliases to register
1845 * @return 0 on success, an errno on failure.
1847 * This helper function allows drivers to register several supply
1848 * aliases in one operation. If any of the aliases cannot be
1849 * registered any aliases that were registered will be removed
1850 * before returning to the caller.
1852 int regulator_bulk_register_supply_alias(struct device
*dev
,
1853 const char *const *id
,
1854 struct device
*alias_dev
,
1855 const char *const *alias_id
,
1861 for (i
= 0; i
< num_id
; ++i
) {
1862 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1872 "Failed to create supply alias %s,%s -> %s,%s\n",
1873 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1876 regulator_unregister_supply_alias(dev
, id
[i
]);
1880 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1883 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1885 * @dev: device that will be given as the regulator "consumer"
1886 * @id: List of supply names or regulator IDs
1887 * @num_id: Number of aliases to unregister
1889 * This helper function allows drivers to unregister several supply
1890 * aliases in one operation.
1892 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1893 const char *const *id
,
1898 for (i
= 0; i
< num_id
; ++i
)
1899 regulator_unregister_supply_alias(dev
, id
[i
]);
1901 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1904 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1905 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1906 const struct regulator_config
*config
)
1908 struct regulator_enable_gpio
*pin
;
1909 struct gpio_desc
*gpiod
;
1912 gpiod
= gpio_to_desc(config
->ena_gpio
);
1914 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1915 if (pin
->gpiod
== gpiod
) {
1916 rdev_dbg(rdev
, "GPIO %d is already used\n",
1918 goto update_ena_gpio_to_rdev
;
1922 ret
= gpio_request_one(config
->ena_gpio
,
1923 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1924 rdev_get_name(rdev
));
1928 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1930 gpio_free(config
->ena_gpio
);
1935 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1936 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1938 update_ena_gpio_to_rdev
:
1939 pin
->request_count
++;
1940 rdev
->ena_pin
= pin
;
1944 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1946 struct regulator_enable_gpio
*pin
, *n
;
1951 /* Free the GPIO only in case of no use */
1952 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1953 if (pin
->gpiod
== rdev
->ena_pin
->gpiod
) {
1954 if (pin
->request_count
<= 1) {
1955 pin
->request_count
= 0;
1956 gpiod_put(pin
->gpiod
);
1957 list_del(&pin
->list
);
1959 rdev
->ena_pin
= NULL
;
1962 pin
->request_count
--;
1969 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1970 * @rdev: regulator_dev structure
1971 * @enable: enable GPIO at initial use?
1973 * GPIO is enabled in case of initial use. (enable_count is 0)
1974 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1976 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1978 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1984 /* Enable GPIO at initial use */
1985 if (pin
->enable_count
== 0)
1986 gpiod_set_value_cansleep(pin
->gpiod
,
1987 !pin
->ena_gpio_invert
);
1989 pin
->enable_count
++;
1991 if (pin
->enable_count
> 1) {
1992 pin
->enable_count
--;
1996 /* Disable GPIO if not used */
1997 if (pin
->enable_count
<= 1) {
1998 gpiod_set_value_cansleep(pin
->gpiod
,
1999 pin
->ena_gpio_invert
);
2000 pin
->enable_count
= 0;
2008 * _regulator_enable_delay - a delay helper function
2009 * @delay: time to delay in microseconds
2011 * Delay for the requested amount of time as per the guidelines in:
2013 * Documentation/timers/timers-howto.txt
2015 * The assumption here is that regulators will never be enabled in
2016 * atomic context and therefore sleeping functions can be used.
2018 static void _regulator_enable_delay(unsigned int delay
)
2020 unsigned int ms
= delay
/ 1000;
2021 unsigned int us
= delay
% 1000;
2025 * For small enough values, handle super-millisecond
2026 * delays in the usleep_range() call below.
2035 * Give the scheduler some room to coalesce with any other
2036 * wakeup sources. For delays shorter than 10 us, don't even
2037 * bother setting up high-resolution timers and just busy-
2041 usleep_range(us
, us
+ 100);
2046 static int _regulator_do_enable(struct regulator_dev
*rdev
)
2050 /* Query before enabling in case configuration dependent. */
2051 ret
= _regulator_get_enable_time(rdev
);
2055 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
2059 trace_regulator_enable(rdev_get_name(rdev
));
2061 if (rdev
->desc
->off_on_delay
) {
2062 /* if needed, keep a distance of off_on_delay from last time
2063 * this regulator was disabled.
2065 unsigned long start_jiffy
= jiffies
;
2066 unsigned long intended
, max_delay
, remaining
;
2068 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
2069 intended
= rdev
->last_off_jiffy
+ max_delay
;
2071 if (time_before(start_jiffy
, intended
)) {
2072 /* calc remaining jiffies to deal with one-time
2074 * in case of multiple timer wrapping, either it can be
2075 * detected by out-of-range remaining, or it cannot be
2076 * detected and we gets a panelty of
2077 * _regulator_enable_delay().
2079 remaining
= intended
- start_jiffy
;
2080 if (remaining
<= max_delay
)
2081 _regulator_enable_delay(
2082 jiffies_to_usecs(remaining
));
2086 if (rdev
->ena_pin
) {
2087 if (!rdev
->ena_gpio_state
) {
2088 ret
= regulator_ena_gpio_ctrl(rdev
, true);
2091 rdev
->ena_gpio_state
= 1;
2093 } else if (rdev
->desc
->ops
->enable
) {
2094 ret
= rdev
->desc
->ops
->enable(rdev
);
2101 /* Allow the regulator to ramp; it would be useful to extend
2102 * this for bulk operations so that the regulators can ramp
2104 trace_regulator_enable_delay(rdev_get_name(rdev
));
2106 _regulator_enable_delay(delay
);
2108 trace_regulator_enable_complete(rdev_get_name(rdev
));
2113 /* locks held by regulator_enable() */
2114 static int _regulator_enable(struct regulator_dev
*rdev
)
2118 lockdep_assert_held_once(&rdev
->mutex
);
2120 /* check voltage and requested load before enabling */
2121 if (rdev
->constraints
&&
2122 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
2123 drms_uA_update(rdev
);
2125 if (rdev
->use_count
== 0) {
2126 /* The regulator may on if it's not switchable or left on */
2127 ret
= _regulator_is_enabled(rdev
);
2128 if (ret
== -EINVAL
|| ret
== 0) {
2129 if (!_regulator_can_change_status(rdev
))
2132 ret
= _regulator_do_enable(rdev
);
2136 } else if (ret
< 0) {
2137 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
2140 /* Fallthrough on positive return values - already enabled */
2149 * regulator_enable - enable regulator output
2150 * @regulator: regulator source
2152 * Request that the regulator be enabled with the regulator output at
2153 * the predefined voltage or current value. Calls to regulator_enable()
2154 * must be balanced with calls to regulator_disable().
2156 * NOTE: the output value can be set by other drivers, boot loader or may be
2157 * hardwired in the regulator.
2159 int regulator_enable(struct regulator
*regulator
)
2161 struct regulator_dev
*rdev
= regulator
->rdev
;
2164 if (regulator
->always_on
)
2168 ret
= regulator_enable(rdev
->supply
);
2173 mutex_lock(&rdev
->mutex
);
2174 ret
= _regulator_enable(rdev
);
2175 mutex_unlock(&rdev
->mutex
);
2177 if (ret
!= 0 && rdev
->supply
)
2178 regulator_disable(rdev
->supply
);
2182 EXPORT_SYMBOL_GPL(regulator_enable
);
2184 static int _regulator_do_disable(struct regulator_dev
*rdev
)
2188 trace_regulator_disable(rdev_get_name(rdev
));
2190 if (rdev
->ena_pin
) {
2191 if (rdev
->ena_gpio_state
) {
2192 ret
= regulator_ena_gpio_ctrl(rdev
, false);
2195 rdev
->ena_gpio_state
= 0;
2198 } else if (rdev
->desc
->ops
->disable
) {
2199 ret
= rdev
->desc
->ops
->disable(rdev
);
2204 /* cares about last_off_jiffy only if off_on_delay is required by
2207 if (rdev
->desc
->off_on_delay
)
2208 rdev
->last_off_jiffy
= jiffies
;
2210 trace_regulator_disable_complete(rdev_get_name(rdev
));
2215 /* locks held by regulator_disable() */
2216 static int _regulator_disable(struct regulator_dev
*rdev
)
2220 lockdep_assert_held_once(&rdev
->mutex
);
2222 if (WARN(rdev
->use_count
<= 0,
2223 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
2226 /* are we the last user and permitted to disable ? */
2227 if (rdev
->use_count
== 1 &&
2228 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
2230 /* we are last user */
2231 if (_regulator_can_change_status(rdev
)) {
2232 ret
= _notifier_call_chain(rdev
,
2233 REGULATOR_EVENT_PRE_DISABLE
,
2235 if (ret
& NOTIFY_STOP_MASK
)
2238 ret
= _regulator_do_disable(rdev
);
2240 rdev_err(rdev
, "failed to disable\n");
2241 _notifier_call_chain(rdev
,
2242 REGULATOR_EVENT_ABORT_DISABLE
,
2246 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
2250 rdev
->use_count
= 0;
2251 } else if (rdev
->use_count
> 1) {
2253 if (rdev
->constraints
&&
2254 (rdev
->constraints
->valid_ops_mask
&
2255 REGULATOR_CHANGE_DRMS
))
2256 drms_uA_update(rdev
);
2265 * regulator_disable - disable regulator output
2266 * @regulator: regulator source
2268 * Disable the regulator output voltage or current. Calls to
2269 * regulator_enable() must be balanced with calls to
2270 * regulator_disable().
2272 * NOTE: this will only disable the regulator output if no other consumer
2273 * devices have it enabled, the regulator device supports disabling and
2274 * machine constraints permit this operation.
2276 int regulator_disable(struct regulator
*regulator
)
2278 struct regulator_dev
*rdev
= regulator
->rdev
;
2281 if (regulator
->always_on
)
2284 mutex_lock(&rdev
->mutex
);
2285 ret
= _regulator_disable(rdev
);
2286 mutex_unlock(&rdev
->mutex
);
2288 if (ret
== 0 && rdev
->supply
)
2289 regulator_disable(rdev
->supply
);
2293 EXPORT_SYMBOL_GPL(regulator_disable
);
2295 /* locks held by regulator_force_disable() */
2296 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2300 lockdep_assert_held_once(&rdev
->mutex
);
2302 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2303 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2304 if (ret
& NOTIFY_STOP_MASK
)
2307 ret
= _regulator_do_disable(rdev
);
2309 rdev_err(rdev
, "failed to force disable\n");
2310 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2311 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2315 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2316 REGULATOR_EVENT_DISABLE
, NULL
);
2322 * regulator_force_disable - force disable regulator output
2323 * @regulator: regulator source
2325 * Forcibly disable the regulator output voltage or current.
2326 * NOTE: this *will* disable the regulator output even if other consumer
2327 * devices have it enabled. This should be used for situations when device
2328 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2330 int regulator_force_disable(struct regulator
*regulator
)
2332 struct regulator_dev
*rdev
= regulator
->rdev
;
2335 mutex_lock(&rdev
->mutex
);
2336 regulator
->uA_load
= 0;
2337 ret
= _regulator_force_disable(regulator
->rdev
);
2338 mutex_unlock(&rdev
->mutex
);
2341 while (rdev
->open_count
--)
2342 regulator_disable(rdev
->supply
);
2346 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2348 static void regulator_disable_work(struct work_struct
*work
)
2350 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2354 mutex_lock(&rdev
->mutex
);
2356 BUG_ON(!rdev
->deferred_disables
);
2358 count
= rdev
->deferred_disables
;
2359 rdev
->deferred_disables
= 0;
2361 for (i
= 0; i
< count
; i
++) {
2362 ret
= _regulator_disable(rdev
);
2364 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2367 mutex_unlock(&rdev
->mutex
);
2370 for (i
= 0; i
< count
; i
++) {
2371 ret
= regulator_disable(rdev
->supply
);
2374 "Supply disable failed: %d\n", ret
);
2381 * regulator_disable_deferred - disable regulator output with delay
2382 * @regulator: regulator source
2383 * @ms: miliseconds until the regulator is disabled
2385 * Execute regulator_disable() on the regulator after a delay. This
2386 * is intended for use with devices that require some time to quiesce.
2388 * NOTE: this will only disable the regulator output if no other consumer
2389 * devices have it enabled, the regulator device supports disabling and
2390 * machine constraints permit this operation.
2392 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2394 struct regulator_dev
*rdev
= regulator
->rdev
;
2396 if (regulator
->always_on
)
2400 return regulator_disable(regulator
);
2402 mutex_lock(&rdev
->mutex
);
2403 rdev
->deferred_disables
++;
2404 mutex_unlock(&rdev
->mutex
);
2406 queue_delayed_work(system_power_efficient_wq
, &rdev
->disable_work
,
2407 msecs_to_jiffies(ms
));
2410 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2412 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2414 /* A GPIO control always takes precedence */
2416 return rdev
->ena_gpio_state
;
2418 /* If we don't know then assume that the regulator is always on */
2419 if (!rdev
->desc
->ops
->is_enabled
)
2422 return rdev
->desc
->ops
->is_enabled(rdev
);
2425 static int _regulator_list_voltage(struct regulator
*regulator
,
2426 unsigned selector
, int lock
)
2428 struct regulator_dev
*rdev
= regulator
->rdev
;
2429 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2432 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2433 return rdev
->desc
->fixed_uV
;
2435 if (ops
->list_voltage
) {
2436 if (selector
>= rdev
->desc
->n_voltages
)
2439 mutex_lock(&rdev
->mutex
);
2440 ret
= ops
->list_voltage(rdev
, selector
);
2442 mutex_unlock(&rdev
->mutex
);
2443 } else if (rdev
->supply
) {
2444 ret
= _regulator_list_voltage(rdev
->supply
, selector
, lock
);
2450 if (ret
< rdev
->constraints
->min_uV
)
2452 else if (ret
> rdev
->constraints
->max_uV
)
2460 * regulator_is_enabled - is the regulator output enabled
2461 * @regulator: regulator source
2463 * Returns positive if the regulator driver backing the source/client
2464 * has requested that the device be enabled, zero if it hasn't, else a
2465 * negative errno code.
2467 * Note that the device backing this regulator handle can have multiple
2468 * users, so it might be enabled even if regulator_enable() was never
2469 * called for this particular source.
2471 int regulator_is_enabled(struct regulator
*regulator
)
2475 if (regulator
->always_on
)
2478 mutex_lock(®ulator
->rdev
->mutex
);
2479 ret
= _regulator_is_enabled(regulator
->rdev
);
2480 mutex_unlock(®ulator
->rdev
->mutex
);
2484 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2487 * regulator_can_change_voltage - check if regulator can change voltage
2488 * @regulator: regulator source
2490 * Returns positive if the regulator driver backing the source/client
2491 * can change its voltage, false otherwise. Useful for detecting fixed
2492 * or dummy regulators and disabling voltage change logic in the client
2495 int regulator_can_change_voltage(struct regulator
*regulator
)
2497 struct regulator_dev
*rdev
= regulator
->rdev
;
2499 if (rdev
->constraints
&&
2500 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2501 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2504 if (rdev
->desc
->continuous_voltage_range
&&
2505 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2506 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2512 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2515 * regulator_count_voltages - count regulator_list_voltage() selectors
2516 * @regulator: regulator source
2518 * Returns number of selectors, or negative errno. Selectors are
2519 * numbered starting at zero, and typically correspond to bitfields
2520 * in hardware registers.
2522 int regulator_count_voltages(struct regulator
*regulator
)
2524 struct regulator_dev
*rdev
= regulator
->rdev
;
2526 if (rdev
->desc
->n_voltages
)
2527 return rdev
->desc
->n_voltages
;
2532 return regulator_count_voltages(rdev
->supply
);
2534 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2537 * regulator_list_voltage - enumerate supported voltages
2538 * @regulator: regulator source
2539 * @selector: identify voltage to list
2540 * Context: can sleep
2542 * Returns a voltage that can be passed to @regulator_set_voltage(),
2543 * zero if this selector code can't be used on this system, or a
2546 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2548 return _regulator_list_voltage(regulator
, selector
, 1);
2550 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2553 * regulator_get_regmap - get the regulator's register map
2554 * @regulator: regulator source
2556 * Returns the register map for the given regulator, or an ERR_PTR value
2557 * if the regulator doesn't use regmap.
2559 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
2561 struct regmap
*map
= regulator
->rdev
->regmap
;
2563 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
2567 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2568 * @regulator: regulator source
2569 * @vsel_reg: voltage selector register, output parameter
2570 * @vsel_mask: mask for voltage selector bitfield, output parameter
2572 * Returns the hardware register offset and bitmask used for setting the
2573 * regulator voltage. This might be useful when configuring voltage-scaling
2574 * hardware or firmware that can make I2C requests behind the kernel's back,
2577 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2578 * and 0 is returned, otherwise a negative errno is returned.
2580 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
2582 unsigned *vsel_mask
)
2584 struct regulator_dev
*rdev
= regulator
->rdev
;
2585 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2587 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2590 *vsel_reg
= rdev
->desc
->vsel_reg
;
2591 *vsel_mask
= rdev
->desc
->vsel_mask
;
2595 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
2598 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2599 * @regulator: regulator source
2600 * @selector: identify voltage to list
2602 * Converts the selector to a hardware-specific voltage selector that can be
2603 * directly written to the regulator registers. The address of the voltage
2604 * register can be determined by calling @regulator_get_hardware_vsel_register.
2606 * On error a negative errno is returned.
2608 int regulator_list_hardware_vsel(struct regulator
*regulator
,
2611 struct regulator_dev
*rdev
= regulator
->rdev
;
2612 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2614 if (selector
>= rdev
->desc
->n_voltages
)
2616 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2621 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
2624 * regulator_get_linear_step - return the voltage step size between VSEL values
2625 * @regulator: regulator source
2627 * Returns the voltage step size between VSEL values for linear
2628 * regulators, or return 0 if the regulator isn't a linear regulator.
2630 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2632 struct regulator_dev
*rdev
= regulator
->rdev
;
2634 return rdev
->desc
->uV_step
;
2636 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2639 * regulator_is_supported_voltage - check if a voltage range can be supported
2641 * @regulator: Regulator to check.
2642 * @min_uV: Minimum required voltage in uV.
2643 * @max_uV: Maximum required voltage in uV.
2645 * Returns a boolean or a negative error code.
2647 int regulator_is_supported_voltage(struct regulator
*regulator
,
2648 int min_uV
, int max_uV
)
2650 struct regulator_dev
*rdev
= regulator
->rdev
;
2651 int i
, voltages
, ret
;
2653 /* If we can't change voltage check the current voltage */
2654 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2655 ret
= regulator_get_voltage(regulator
);
2657 return min_uV
<= ret
&& ret
<= max_uV
;
2662 /* Any voltage within constrains range is fine? */
2663 if (rdev
->desc
->continuous_voltage_range
)
2664 return min_uV
>= rdev
->constraints
->min_uV
&&
2665 max_uV
<= rdev
->constraints
->max_uV
;
2667 ret
= regulator_count_voltages(regulator
);
2672 for (i
= 0; i
< voltages
; i
++) {
2673 ret
= regulator_list_voltage(regulator
, i
);
2675 if (ret
>= min_uV
&& ret
<= max_uV
)
2681 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2683 static int regulator_map_voltage(struct regulator_dev
*rdev
, int min_uV
,
2686 const struct regulator_desc
*desc
= rdev
->desc
;
2688 if (desc
->ops
->map_voltage
)
2689 return desc
->ops
->map_voltage(rdev
, min_uV
, max_uV
);
2691 if (desc
->ops
->list_voltage
== regulator_list_voltage_linear
)
2692 return regulator_map_voltage_linear(rdev
, min_uV
, max_uV
);
2694 if (desc
->ops
->list_voltage
== regulator_list_voltage_linear_range
)
2695 return regulator_map_voltage_linear_range(rdev
, min_uV
, max_uV
);
2697 return regulator_map_voltage_iterate(rdev
, min_uV
, max_uV
);
2700 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
2701 int min_uV
, int max_uV
,
2704 struct pre_voltage_change_data data
;
2707 data
.old_uV
= _regulator_get_voltage(rdev
);
2708 data
.min_uV
= min_uV
;
2709 data
.max_uV
= max_uV
;
2710 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2712 if (ret
& NOTIFY_STOP_MASK
)
2715 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
2719 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2720 (void *)data
.old_uV
);
2725 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
2726 int uV
, unsigned selector
)
2728 struct pre_voltage_change_data data
;
2731 data
.old_uV
= _regulator_get_voltage(rdev
);
2734 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2736 if (ret
& NOTIFY_STOP_MASK
)
2739 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
2743 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2744 (void *)data
.old_uV
);
2749 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2750 int min_uV
, int max_uV
)
2755 unsigned int selector
;
2756 int old_selector
= -1;
2758 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2760 min_uV
+= rdev
->constraints
->uV_offset
;
2761 max_uV
+= rdev
->constraints
->uV_offset
;
2764 * If we can't obtain the old selector there is not enough
2765 * info to call set_voltage_time_sel().
2767 if (_regulator_is_enabled(rdev
) &&
2768 rdev
->desc
->ops
->set_voltage_time_sel
&&
2769 rdev
->desc
->ops
->get_voltage_sel
) {
2770 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2771 if (old_selector
< 0)
2772 return old_selector
;
2775 if (rdev
->desc
->ops
->set_voltage
) {
2776 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
2780 if (rdev
->desc
->ops
->list_voltage
)
2781 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2784 best_val
= _regulator_get_voltage(rdev
);
2787 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2788 ret
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
2790 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2791 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2793 if (old_selector
== selector
)
2796 ret
= _regulator_call_set_voltage_sel(
2797 rdev
, best_val
, selector
);
2806 /* Call set_voltage_time_sel if successfully obtained old_selector */
2807 if (ret
== 0 && !rdev
->constraints
->ramp_disable
&& old_selector
>= 0
2808 && old_selector
!= selector
) {
2810 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2811 old_selector
, selector
);
2813 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2818 /* Insert any necessary delays */
2819 if (delay
>= 1000) {
2820 mdelay(delay
/ 1000);
2821 udelay(delay
% 1000);
2827 if (ret
== 0 && best_val
>= 0) {
2828 unsigned long data
= best_val
;
2830 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2834 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2839 static int regulator_set_voltage_unlocked(struct regulator
*regulator
,
2840 int min_uV
, int max_uV
)
2842 struct regulator_dev
*rdev
= regulator
->rdev
;
2844 int old_min_uV
, old_max_uV
;
2846 int best_supply_uV
= 0;
2847 int supply_change_uV
= 0;
2849 /* If we're setting the same range as last time the change
2850 * should be a noop (some cpufreq implementations use the same
2851 * voltage for multiple frequencies, for example).
2853 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2856 /* If we're trying to set a range that overlaps the current voltage,
2857 * return successfully even though the regulator does not support
2858 * changing the voltage.
2860 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2861 current_uV
= _regulator_get_voltage(rdev
);
2862 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
2863 regulator
->min_uV
= min_uV
;
2864 regulator
->max_uV
= max_uV
;
2870 if (!rdev
->desc
->ops
->set_voltage
&&
2871 !rdev
->desc
->ops
->set_voltage_sel
) {
2876 /* constraints check */
2877 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2881 /* restore original values in case of error */
2882 old_min_uV
= regulator
->min_uV
;
2883 old_max_uV
= regulator
->max_uV
;
2884 regulator
->min_uV
= min_uV
;
2885 regulator
->max_uV
= max_uV
;
2887 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2891 if (rdev
->supply
&& (rdev
->desc
->min_dropout_uV
||
2892 !rdev
->desc
->ops
->get_voltage
)) {
2893 int current_supply_uV
;
2896 selector
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
2902 best_supply_uV
= _regulator_list_voltage(regulator
, selector
, 0);
2903 if (best_supply_uV
< 0) {
2904 ret
= best_supply_uV
;
2908 best_supply_uV
+= rdev
->desc
->min_dropout_uV
;
2910 current_supply_uV
= _regulator_get_voltage(rdev
->supply
->rdev
);
2911 if (current_supply_uV
< 0) {
2912 ret
= current_supply_uV
;
2916 supply_change_uV
= best_supply_uV
- current_supply_uV
;
2919 if (supply_change_uV
> 0) {
2920 ret
= regulator_set_voltage_unlocked(rdev
->supply
,
2921 best_supply_uV
, INT_MAX
);
2923 dev_err(&rdev
->dev
, "Failed to increase supply voltage: %d\n",
2929 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2933 if (supply_change_uV
< 0) {
2934 ret
= regulator_set_voltage_unlocked(rdev
->supply
,
2935 best_supply_uV
, INT_MAX
);
2937 dev_warn(&rdev
->dev
, "Failed to decrease supply voltage: %d\n",
2939 /* No need to fail here */
2946 regulator
->min_uV
= old_min_uV
;
2947 regulator
->max_uV
= old_max_uV
;
2953 * regulator_set_voltage - set regulator output voltage
2954 * @regulator: regulator source
2955 * @min_uV: Minimum required voltage in uV
2956 * @max_uV: Maximum acceptable voltage in uV
2958 * Sets a voltage regulator to the desired output voltage. This can be set
2959 * during any regulator state. IOW, regulator can be disabled or enabled.
2961 * If the regulator is enabled then the voltage will change to the new value
2962 * immediately otherwise if the regulator is disabled the regulator will
2963 * output at the new voltage when enabled.
2965 * NOTE: If the regulator is shared between several devices then the lowest
2966 * request voltage that meets the system constraints will be used.
2967 * Regulator system constraints must be set for this regulator before
2968 * calling this function otherwise this call will fail.
2970 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2974 regulator_lock_supply(regulator
->rdev
);
2976 ret
= regulator_set_voltage_unlocked(regulator
, min_uV
, max_uV
);
2978 regulator_unlock_supply(regulator
->rdev
);
2982 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2985 * regulator_set_voltage_time - get raise/fall time
2986 * @regulator: regulator source
2987 * @old_uV: starting voltage in microvolts
2988 * @new_uV: target voltage in microvolts
2990 * Provided with the starting and ending voltage, this function attempts to
2991 * calculate the time in microseconds required to rise or fall to this new
2994 int regulator_set_voltage_time(struct regulator
*regulator
,
2995 int old_uV
, int new_uV
)
2997 struct regulator_dev
*rdev
= regulator
->rdev
;
2998 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3004 /* Currently requires operations to do this */
3005 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
3006 || !rdev
->desc
->n_voltages
)
3009 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
3010 /* We only look for exact voltage matches here */
3011 voltage
= regulator_list_voltage(regulator
, i
);
3016 if (voltage
== old_uV
)
3018 if (voltage
== new_uV
)
3022 if (old_sel
< 0 || new_sel
< 0)
3025 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
3027 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
3030 * regulator_set_voltage_time_sel - get raise/fall time
3031 * @rdev: regulator source device
3032 * @old_selector: selector for starting voltage
3033 * @new_selector: selector for target voltage
3035 * Provided with the starting and target voltage selectors, this function
3036 * returns time in microseconds required to rise or fall to this new voltage
3038 * Drivers providing ramp_delay in regulation_constraints can use this as their
3039 * set_voltage_time_sel() operation.
3041 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
3042 unsigned int old_selector
,
3043 unsigned int new_selector
)
3045 unsigned int ramp_delay
= 0;
3046 int old_volt
, new_volt
;
3048 if (rdev
->constraints
->ramp_delay
)
3049 ramp_delay
= rdev
->constraints
->ramp_delay
;
3050 else if (rdev
->desc
->ramp_delay
)
3051 ramp_delay
= rdev
->desc
->ramp_delay
;
3053 if (ramp_delay
== 0) {
3054 rdev_warn(rdev
, "ramp_delay not set\n");
3059 if (!rdev
->desc
->ops
->list_voltage
)
3062 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
3063 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
3065 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
3067 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
3070 * regulator_sync_voltage - re-apply last regulator output voltage
3071 * @regulator: regulator source
3073 * Re-apply the last configured voltage. This is intended to be used
3074 * where some external control source the consumer is cooperating with
3075 * has caused the configured voltage to change.
3077 int regulator_sync_voltage(struct regulator
*regulator
)
3079 struct regulator_dev
*rdev
= regulator
->rdev
;
3080 int ret
, min_uV
, max_uV
;
3082 mutex_lock(&rdev
->mutex
);
3084 if (!rdev
->desc
->ops
->set_voltage
&&
3085 !rdev
->desc
->ops
->set_voltage_sel
) {
3090 /* This is only going to work if we've had a voltage configured. */
3091 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
3096 min_uV
= regulator
->min_uV
;
3097 max_uV
= regulator
->max_uV
;
3099 /* This should be a paranoia check... */
3100 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
3104 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
3108 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
3111 mutex_unlock(&rdev
->mutex
);
3114 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
3116 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
3121 if (rdev
->desc
->ops
->get_bypass
) {
3122 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypassed
);
3126 /* if bypassed the regulator must have a supply */
3130 return _regulator_get_voltage(rdev
->supply
->rdev
);
3134 if (rdev
->desc
->ops
->get_voltage_sel
) {
3135 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
3138 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
3139 } else if (rdev
->desc
->ops
->get_voltage
) {
3140 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
3141 } else if (rdev
->desc
->ops
->list_voltage
) {
3142 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
3143 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
3144 ret
= rdev
->desc
->fixed_uV
;
3145 } else if (rdev
->supply
) {
3146 ret
= _regulator_get_voltage(rdev
->supply
->rdev
);
3153 return ret
- rdev
->constraints
->uV_offset
;
3157 * regulator_get_voltage - get regulator output voltage
3158 * @regulator: regulator source
3160 * This returns the current regulator voltage in uV.
3162 * NOTE: If the regulator is disabled it will return the voltage value. This
3163 * function should not be used to determine regulator state.
3165 int regulator_get_voltage(struct regulator
*regulator
)
3169 regulator_lock_supply(regulator
->rdev
);
3171 ret
= _regulator_get_voltage(regulator
->rdev
);
3173 regulator_unlock_supply(regulator
->rdev
);
3177 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
3180 * regulator_set_current_limit - set regulator output current limit
3181 * @regulator: regulator source
3182 * @min_uA: Minimum supported current in uA
3183 * @max_uA: Maximum supported current in uA
3185 * Sets current sink to the desired output current. This can be set during
3186 * any regulator state. IOW, regulator can be disabled or enabled.
3188 * If the regulator is enabled then the current will change to the new value
3189 * immediately otherwise if the regulator is disabled the regulator will
3190 * output at the new current when enabled.
3192 * NOTE: Regulator system constraints must be set for this regulator before
3193 * calling this function otherwise this call will fail.
3195 int regulator_set_current_limit(struct regulator
*regulator
,
3196 int min_uA
, int max_uA
)
3198 struct regulator_dev
*rdev
= regulator
->rdev
;
3201 mutex_lock(&rdev
->mutex
);
3204 if (!rdev
->desc
->ops
->set_current_limit
) {
3209 /* constraints check */
3210 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
3214 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
3216 mutex_unlock(&rdev
->mutex
);
3219 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
3221 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
3225 mutex_lock(&rdev
->mutex
);
3228 if (!rdev
->desc
->ops
->get_current_limit
) {
3233 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
3235 mutex_unlock(&rdev
->mutex
);
3240 * regulator_get_current_limit - get regulator output current
3241 * @regulator: regulator source
3243 * This returns the current supplied by the specified current sink in uA.
3245 * NOTE: If the regulator is disabled it will return the current value. This
3246 * function should not be used to determine regulator state.
3248 int regulator_get_current_limit(struct regulator
*regulator
)
3250 return _regulator_get_current_limit(regulator
->rdev
);
3252 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
3255 * regulator_set_mode - set regulator operating mode
3256 * @regulator: regulator source
3257 * @mode: operating mode - one of the REGULATOR_MODE constants
3259 * Set regulator operating mode to increase regulator efficiency or improve
3260 * regulation performance.
3262 * NOTE: Regulator system constraints must be set for this regulator before
3263 * calling this function otherwise this call will fail.
3265 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
3267 struct regulator_dev
*rdev
= regulator
->rdev
;
3269 int regulator_curr_mode
;
3271 mutex_lock(&rdev
->mutex
);
3274 if (!rdev
->desc
->ops
->set_mode
) {
3279 /* return if the same mode is requested */
3280 if (rdev
->desc
->ops
->get_mode
) {
3281 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
3282 if (regulator_curr_mode
== mode
) {
3288 /* constraints check */
3289 ret
= regulator_mode_constrain(rdev
, &mode
);
3293 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
3295 mutex_unlock(&rdev
->mutex
);
3298 EXPORT_SYMBOL_GPL(regulator_set_mode
);
3300 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
3304 mutex_lock(&rdev
->mutex
);
3307 if (!rdev
->desc
->ops
->get_mode
) {
3312 ret
= rdev
->desc
->ops
->get_mode(rdev
);
3314 mutex_unlock(&rdev
->mutex
);
3319 * regulator_get_mode - get regulator operating mode
3320 * @regulator: regulator source
3322 * Get the current regulator operating mode.
3324 unsigned int regulator_get_mode(struct regulator
*regulator
)
3326 return _regulator_get_mode(regulator
->rdev
);
3328 EXPORT_SYMBOL_GPL(regulator_get_mode
);
3331 * regulator_set_load - set regulator load
3332 * @regulator: regulator source
3333 * @uA_load: load current
3335 * Notifies the regulator core of a new device load. This is then used by
3336 * DRMS (if enabled by constraints) to set the most efficient regulator
3337 * operating mode for the new regulator loading.
3339 * Consumer devices notify their supply regulator of the maximum power
3340 * they will require (can be taken from device datasheet in the power
3341 * consumption tables) when they change operational status and hence power
3342 * state. Examples of operational state changes that can affect power
3343 * consumption are :-
3345 * o Device is opened / closed.
3346 * o Device I/O is about to begin or has just finished.
3347 * o Device is idling in between work.
3349 * This information is also exported via sysfs to userspace.
3351 * DRMS will sum the total requested load on the regulator and change
3352 * to the most efficient operating mode if platform constraints allow.
3354 * On error a negative errno is returned.
3356 int regulator_set_load(struct regulator
*regulator
, int uA_load
)
3358 struct regulator_dev
*rdev
= regulator
->rdev
;
3361 mutex_lock(&rdev
->mutex
);
3362 regulator
->uA_load
= uA_load
;
3363 ret
= drms_uA_update(rdev
);
3364 mutex_unlock(&rdev
->mutex
);
3368 EXPORT_SYMBOL_GPL(regulator_set_load
);
3371 * regulator_allow_bypass - allow the regulator to go into bypass mode
3373 * @regulator: Regulator to configure
3374 * @enable: enable or disable bypass mode
3376 * Allow the regulator to go into bypass mode if all other consumers
3377 * for the regulator also enable bypass mode and the machine
3378 * constraints allow this. Bypass mode means that the regulator is
3379 * simply passing the input directly to the output with no regulation.
3381 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3383 struct regulator_dev
*rdev
= regulator
->rdev
;
3386 if (!rdev
->desc
->ops
->set_bypass
)
3389 if (rdev
->constraints
&&
3390 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
3393 mutex_lock(&rdev
->mutex
);
3395 if (enable
&& !regulator
->bypass
) {
3396 rdev
->bypass_count
++;
3398 if (rdev
->bypass_count
== rdev
->open_count
) {
3399 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3401 rdev
->bypass_count
--;
3404 } else if (!enable
&& regulator
->bypass
) {
3405 rdev
->bypass_count
--;
3407 if (rdev
->bypass_count
!= rdev
->open_count
) {
3408 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3410 rdev
->bypass_count
++;
3415 regulator
->bypass
= enable
;
3417 mutex_unlock(&rdev
->mutex
);
3421 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3424 * regulator_register_notifier - register regulator event notifier
3425 * @regulator: regulator source
3426 * @nb: notifier block
3428 * Register notifier block to receive regulator events.
3430 int regulator_register_notifier(struct regulator
*regulator
,
3431 struct notifier_block
*nb
)
3433 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3436 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3439 * regulator_unregister_notifier - unregister regulator event notifier
3440 * @regulator: regulator source
3441 * @nb: notifier block
3443 * Unregister regulator event notifier block.
3445 int regulator_unregister_notifier(struct regulator
*regulator
,
3446 struct notifier_block
*nb
)
3448 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3451 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3453 /* notify regulator consumers and downstream regulator consumers.
3454 * Note mutex must be held by caller.
3456 static int _notifier_call_chain(struct regulator_dev
*rdev
,
3457 unsigned long event
, void *data
)
3459 /* call rdev chain first */
3460 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3464 * regulator_bulk_get - get multiple regulator consumers
3466 * @dev: Device to supply
3467 * @num_consumers: Number of consumers to register
3468 * @consumers: Configuration of consumers; clients are stored here.
3470 * @return 0 on success, an errno on failure.
3472 * This helper function allows drivers to get several regulator
3473 * consumers in one operation. If any of the regulators cannot be
3474 * acquired then any regulators that were allocated will be freed
3475 * before returning to the caller.
3477 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3478 struct regulator_bulk_data
*consumers
)
3483 for (i
= 0; i
< num_consumers
; i
++)
3484 consumers
[i
].consumer
= NULL
;
3486 for (i
= 0; i
< num_consumers
; i
++) {
3487 consumers
[i
].consumer
= _regulator_get(dev
,
3488 consumers
[i
].supply
,
3490 !consumers
[i
].optional
);
3491 if (IS_ERR(consumers
[i
].consumer
)) {
3492 ret
= PTR_ERR(consumers
[i
].consumer
);
3493 dev_err(dev
, "Failed to get supply '%s': %d\n",
3494 consumers
[i
].supply
, ret
);
3495 consumers
[i
].consumer
= NULL
;
3504 regulator_put(consumers
[i
].consumer
);
3508 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3510 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3512 struct regulator_bulk_data
*bulk
= data
;
3514 bulk
->ret
= regulator_enable(bulk
->consumer
);
3518 * regulator_bulk_enable - enable multiple regulator consumers
3520 * @num_consumers: Number of consumers
3521 * @consumers: Consumer data; clients are stored here.
3522 * @return 0 on success, an errno on failure
3524 * This convenience API allows consumers to enable multiple regulator
3525 * clients in a single API call. If any consumers cannot be enabled
3526 * then any others that were enabled will be disabled again prior to
3529 int regulator_bulk_enable(int num_consumers
,
3530 struct regulator_bulk_data
*consumers
)
3532 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3536 for (i
= 0; i
< num_consumers
; i
++) {
3537 if (consumers
[i
].consumer
->always_on
)
3538 consumers
[i
].ret
= 0;
3540 async_schedule_domain(regulator_bulk_enable_async
,
3541 &consumers
[i
], &async_domain
);
3544 async_synchronize_full_domain(&async_domain
);
3546 /* If any consumer failed we need to unwind any that succeeded */
3547 for (i
= 0; i
< num_consumers
; i
++) {
3548 if (consumers
[i
].ret
!= 0) {
3549 ret
= consumers
[i
].ret
;
3557 for (i
= 0; i
< num_consumers
; i
++) {
3558 if (consumers
[i
].ret
< 0)
3559 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3562 regulator_disable(consumers
[i
].consumer
);
3567 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3570 * regulator_bulk_disable - disable multiple regulator consumers
3572 * @num_consumers: Number of consumers
3573 * @consumers: Consumer data; clients are stored here.
3574 * @return 0 on success, an errno on failure
3576 * This convenience API allows consumers to disable multiple regulator
3577 * clients in a single API call. If any consumers cannot be disabled
3578 * then any others that were disabled will be enabled again prior to
3581 int regulator_bulk_disable(int num_consumers
,
3582 struct regulator_bulk_data
*consumers
)
3587 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3588 ret
= regulator_disable(consumers
[i
].consumer
);
3596 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3597 for (++i
; i
< num_consumers
; ++i
) {
3598 r
= regulator_enable(consumers
[i
].consumer
);
3600 pr_err("Failed to reename %s: %d\n",
3601 consumers
[i
].supply
, r
);
3606 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3609 * regulator_bulk_force_disable - force disable multiple regulator consumers
3611 * @num_consumers: Number of consumers
3612 * @consumers: Consumer data; clients are stored here.
3613 * @return 0 on success, an errno on failure
3615 * This convenience API allows consumers to forcibly disable multiple regulator
3616 * clients in a single API call.
3617 * NOTE: This should be used for situations when device damage will
3618 * likely occur if the regulators are not disabled (e.g. over temp).
3619 * Although regulator_force_disable function call for some consumers can
3620 * return error numbers, the function is called for all consumers.
3622 int regulator_bulk_force_disable(int num_consumers
,
3623 struct regulator_bulk_data
*consumers
)
3628 for (i
= 0; i
< num_consumers
; i
++)
3630 regulator_force_disable(consumers
[i
].consumer
);
3632 for (i
= 0; i
< num_consumers
; i
++) {
3633 if (consumers
[i
].ret
!= 0) {
3634 ret
= consumers
[i
].ret
;
3643 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3646 * regulator_bulk_free - free multiple regulator consumers
3648 * @num_consumers: Number of consumers
3649 * @consumers: Consumer data; clients are stored here.
3651 * This convenience API allows consumers to free multiple regulator
3652 * clients in a single API call.
3654 void regulator_bulk_free(int num_consumers
,
3655 struct regulator_bulk_data
*consumers
)
3659 for (i
= 0; i
< num_consumers
; i
++) {
3660 regulator_put(consumers
[i
].consumer
);
3661 consumers
[i
].consumer
= NULL
;
3664 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3667 * regulator_notifier_call_chain - call regulator event notifier
3668 * @rdev: regulator source
3669 * @event: notifier block
3670 * @data: callback-specific data.
3672 * Called by regulator drivers to notify clients a regulator event has
3673 * occurred. We also notify regulator clients downstream.
3674 * Note lock must be held by caller.
3676 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3677 unsigned long event
, void *data
)
3679 lockdep_assert_held_once(&rdev
->mutex
);
3681 _notifier_call_chain(rdev
, event
, data
);
3685 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3688 * regulator_mode_to_status - convert a regulator mode into a status
3690 * @mode: Mode to convert
3692 * Convert a regulator mode into a status.
3694 int regulator_mode_to_status(unsigned int mode
)
3697 case REGULATOR_MODE_FAST
:
3698 return REGULATOR_STATUS_FAST
;
3699 case REGULATOR_MODE_NORMAL
:
3700 return REGULATOR_STATUS_NORMAL
;
3701 case REGULATOR_MODE_IDLE
:
3702 return REGULATOR_STATUS_IDLE
;
3703 case REGULATOR_MODE_STANDBY
:
3704 return REGULATOR_STATUS_STANDBY
;
3706 return REGULATOR_STATUS_UNDEFINED
;
3709 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3711 static struct attribute
*regulator_dev_attrs
[] = {
3712 &dev_attr_name
.attr
,
3713 &dev_attr_num_users
.attr
,
3714 &dev_attr_type
.attr
,
3715 &dev_attr_microvolts
.attr
,
3716 &dev_attr_microamps
.attr
,
3717 &dev_attr_opmode
.attr
,
3718 &dev_attr_state
.attr
,
3719 &dev_attr_status
.attr
,
3720 &dev_attr_bypass
.attr
,
3721 &dev_attr_requested_microamps
.attr
,
3722 &dev_attr_min_microvolts
.attr
,
3723 &dev_attr_max_microvolts
.attr
,
3724 &dev_attr_min_microamps
.attr
,
3725 &dev_attr_max_microamps
.attr
,
3726 &dev_attr_suspend_standby_state
.attr
,
3727 &dev_attr_suspend_mem_state
.attr
,
3728 &dev_attr_suspend_disk_state
.attr
,
3729 &dev_attr_suspend_standby_microvolts
.attr
,
3730 &dev_attr_suspend_mem_microvolts
.attr
,
3731 &dev_attr_suspend_disk_microvolts
.attr
,
3732 &dev_attr_suspend_standby_mode
.attr
,
3733 &dev_attr_suspend_mem_mode
.attr
,
3734 &dev_attr_suspend_disk_mode
.attr
,
3739 * To avoid cluttering sysfs (and memory) with useless state, only
3740 * create attributes that can be meaningfully displayed.
3742 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
3743 struct attribute
*attr
, int idx
)
3745 struct device
*dev
= kobj_to_dev(kobj
);
3746 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
3747 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3748 umode_t mode
= attr
->mode
;
3750 /* these three are always present */
3751 if (attr
== &dev_attr_name
.attr
||
3752 attr
== &dev_attr_num_users
.attr
||
3753 attr
== &dev_attr_type
.attr
)
3756 /* some attributes need specific methods to be displayed */
3757 if (attr
== &dev_attr_microvolts
.attr
) {
3758 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3759 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3760 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3761 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
3766 if (attr
== &dev_attr_microamps
.attr
)
3767 return ops
->get_current_limit
? mode
: 0;
3769 if (attr
== &dev_attr_opmode
.attr
)
3770 return ops
->get_mode
? mode
: 0;
3772 if (attr
== &dev_attr_state
.attr
)
3773 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
3775 if (attr
== &dev_attr_status
.attr
)
3776 return ops
->get_status
? mode
: 0;
3778 if (attr
== &dev_attr_bypass
.attr
)
3779 return ops
->get_bypass
? mode
: 0;
3781 /* some attributes are type-specific */
3782 if (attr
== &dev_attr_requested_microamps
.attr
)
3783 return rdev
->desc
->type
== REGULATOR_CURRENT
? mode
: 0;
3785 /* constraints need specific supporting methods */
3786 if (attr
== &dev_attr_min_microvolts
.attr
||
3787 attr
== &dev_attr_max_microvolts
.attr
)
3788 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
3790 if (attr
== &dev_attr_min_microamps
.attr
||
3791 attr
== &dev_attr_max_microamps
.attr
)
3792 return ops
->set_current_limit
? mode
: 0;
3794 if (attr
== &dev_attr_suspend_standby_state
.attr
||
3795 attr
== &dev_attr_suspend_mem_state
.attr
||
3796 attr
== &dev_attr_suspend_disk_state
.attr
)
3799 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
3800 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
3801 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
3802 return ops
->set_suspend_voltage
? mode
: 0;
3804 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
3805 attr
== &dev_attr_suspend_mem_mode
.attr
||
3806 attr
== &dev_attr_suspend_disk_mode
.attr
)
3807 return ops
->set_suspend_mode
? mode
: 0;
3812 static const struct attribute_group regulator_dev_group
= {
3813 .attrs
= regulator_dev_attrs
,
3814 .is_visible
= regulator_attr_is_visible
,
3817 static const struct attribute_group
*regulator_dev_groups
[] = {
3818 ®ulator_dev_group
,
3822 static void regulator_dev_release(struct device
*dev
)
3824 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
3826 kfree(rdev
->constraints
);
3827 of_node_put(rdev
->dev
.of_node
);
3831 static struct class regulator_class
= {
3832 .name
= "regulator",
3833 .dev_release
= regulator_dev_release
,
3834 .dev_groups
= regulator_dev_groups
,
3837 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3839 struct device
*parent
= rdev
->dev
.parent
;
3840 const char *rname
= rdev_get_name(rdev
);
3841 char name
[NAME_MAX
];
3843 /* Avoid duplicate debugfs directory names */
3844 if (parent
&& rname
== rdev
->desc
->name
) {
3845 snprintf(name
, sizeof(name
), "%s-%s", dev_name(parent
),
3850 rdev
->debugfs
= debugfs_create_dir(rname
, debugfs_root
);
3851 if (!rdev
->debugfs
) {
3852 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3856 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3858 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3860 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3861 &rdev
->bypass_count
);
3864 static int regulator_register_resolve_supply(struct device
*dev
, void *data
)
3866 return regulator_resolve_supply(dev_to_rdev(dev
));
3870 * regulator_register - register regulator
3871 * @regulator_desc: regulator to register
3872 * @cfg: runtime configuration for regulator
3874 * Called by regulator drivers to register a regulator.
3875 * Returns a valid pointer to struct regulator_dev on success
3876 * or an ERR_PTR() on error.
3878 struct regulator_dev
*
3879 regulator_register(const struct regulator_desc
*regulator_desc
,
3880 const struct regulator_config
*cfg
)
3882 const struct regulation_constraints
*constraints
= NULL
;
3883 const struct regulator_init_data
*init_data
;
3884 struct regulator_config
*config
= NULL
;
3885 static atomic_t regulator_no
= ATOMIC_INIT(-1);
3886 struct regulator_dev
*rdev
;
3890 if (regulator_desc
== NULL
|| cfg
== NULL
)
3891 return ERR_PTR(-EINVAL
);
3896 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3897 return ERR_PTR(-EINVAL
);
3899 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3900 regulator_desc
->type
!= REGULATOR_CURRENT
)
3901 return ERR_PTR(-EINVAL
);
3903 /* Only one of each should be implemented */
3904 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3905 regulator_desc
->ops
->get_voltage_sel
);
3906 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3907 regulator_desc
->ops
->set_voltage_sel
);
3909 /* If we're using selectors we must implement list_voltage. */
3910 if (regulator_desc
->ops
->get_voltage_sel
&&
3911 !regulator_desc
->ops
->list_voltage
) {
3912 return ERR_PTR(-EINVAL
);
3914 if (regulator_desc
->ops
->set_voltage_sel
&&
3915 !regulator_desc
->ops
->list_voltage
) {
3916 return ERR_PTR(-EINVAL
);
3919 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3921 return ERR_PTR(-ENOMEM
);
3924 * Duplicate the config so the driver could override it after
3925 * parsing init data.
3927 config
= kmemdup(cfg
, sizeof(*cfg
), GFP_KERNEL
);
3928 if (config
== NULL
) {
3930 return ERR_PTR(-ENOMEM
);
3933 init_data
= regulator_of_get_init_data(dev
, regulator_desc
, config
,
3934 &rdev
->dev
.of_node
);
3936 init_data
= config
->init_data
;
3937 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
3940 mutex_lock(®ulator_list_mutex
);
3942 mutex_init(&rdev
->mutex
);
3943 rdev
->reg_data
= config
->driver_data
;
3944 rdev
->owner
= regulator_desc
->owner
;
3945 rdev
->desc
= regulator_desc
;
3947 rdev
->regmap
= config
->regmap
;
3948 else if (dev_get_regmap(dev
, NULL
))
3949 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3950 else if (dev
->parent
)
3951 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3952 INIT_LIST_HEAD(&rdev
->consumer_list
);
3953 INIT_LIST_HEAD(&rdev
->list
);
3954 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3955 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3957 /* preform any regulator specific init */
3958 if (init_data
&& init_data
->regulator_init
) {
3959 ret
= init_data
->regulator_init(rdev
->reg_data
);
3964 if ((config
->ena_gpio
|| config
->ena_gpio_initialized
) &&
3965 gpio_is_valid(config
->ena_gpio
)) {
3966 ret
= regulator_ena_gpio_request(rdev
, config
);
3968 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3969 config
->ena_gpio
, ret
);
3974 /* register with sysfs */
3975 rdev
->dev
.class = ®ulator_class
;
3976 rdev
->dev
.parent
= dev
;
3977 dev_set_name(&rdev
->dev
, "regulator.%lu",
3978 (unsigned long) atomic_inc_return(®ulator_no
));
3979 ret
= device_register(&rdev
->dev
);
3981 put_device(&rdev
->dev
);
3985 dev_set_drvdata(&rdev
->dev
, rdev
);
3987 /* set regulator constraints */
3989 constraints
= &init_data
->constraints
;
3991 ret
= set_machine_constraints(rdev
, constraints
);
3995 if (init_data
&& init_data
->supply_regulator
)
3996 rdev
->supply_name
= init_data
->supply_regulator
;
3997 else if (regulator_desc
->supply_name
)
3998 rdev
->supply_name
= regulator_desc
->supply_name
;
4000 /* add consumers devices */
4002 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
4003 ret
= set_consumer_device_supply(rdev
,
4004 init_data
->consumer_supplies
[i
].dev_name
,
4005 init_data
->consumer_supplies
[i
].supply
);
4007 dev_err(dev
, "Failed to set supply %s\n",
4008 init_data
->consumer_supplies
[i
].supply
);
4009 goto unset_supplies
;
4014 rdev_init_debugfs(rdev
);
4015 mutex_unlock(®ulator_list_mutex
);
4017 /* try to resolve regulators supply since a new one was registered */
4018 class_for_each_device(®ulator_class
, NULL
, NULL
,
4019 regulator_register_resolve_supply
);
4024 unset_regulator_supplies(rdev
);
4027 regulator_ena_gpio_free(rdev
);
4028 device_unregister(&rdev
->dev
);
4029 /* device core frees rdev */
4033 regulator_ena_gpio_free(rdev
);
4037 mutex_unlock(®ulator_list_mutex
);
4039 return ERR_PTR(ret
);
4041 EXPORT_SYMBOL_GPL(regulator_register
);
4044 * regulator_unregister - unregister regulator
4045 * @rdev: regulator to unregister
4047 * Called by regulator drivers to unregister a regulator.
4049 void regulator_unregister(struct regulator_dev
*rdev
)
4055 while (rdev
->use_count
--)
4056 regulator_disable(rdev
->supply
);
4057 regulator_put(rdev
->supply
);
4059 mutex_lock(®ulator_list_mutex
);
4060 debugfs_remove_recursive(rdev
->debugfs
);
4061 flush_work(&rdev
->disable_work
.work
);
4062 WARN_ON(rdev
->open_count
);
4063 unset_regulator_supplies(rdev
);
4064 list_del(&rdev
->list
);
4065 regulator_ena_gpio_free(rdev
);
4066 mutex_unlock(®ulator_list_mutex
);
4067 device_unregister(&rdev
->dev
);
4069 EXPORT_SYMBOL_GPL(regulator_unregister
);
4071 static int _regulator_suspend_prepare(struct device
*dev
, void *data
)
4073 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4074 const suspend_state_t
*state
= data
;
4077 mutex_lock(&rdev
->mutex
);
4078 ret
= suspend_prepare(rdev
, *state
);
4079 mutex_unlock(&rdev
->mutex
);
4085 * regulator_suspend_prepare - prepare regulators for system wide suspend
4086 * @state: system suspend state
4088 * Configure each regulator with it's suspend operating parameters for state.
4089 * This will usually be called by machine suspend code prior to supending.
4091 int regulator_suspend_prepare(suspend_state_t state
)
4093 /* ON is handled by regulator active state */
4094 if (state
== PM_SUSPEND_ON
)
4097 return class_for_each_device(®ulator_class
, NULL
, &state
,
4098 _regulator_suspend_prepare
);
4100 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
4102 static int _regulator_suspend_finish(struct device
*dev
, void *data
)
4104 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4107 mutex_lock(&rdev
->mutex
);
4108 if (rdev
->use_count
> 0 || rdev
->constraints
->always_on
) {
4109 if (!_regulator_is_enabled(rdev
)) {
4110 ret
= _regulator_do_enable(rdev
);
4113 "Failed to resume regulator %d\n",
4117 if (!have_full_constraints())
4119 if (!_regulator_is_enabled(rdev
))
4122 ret
= _regulator_do_disable(rdev
);
4124 dev_err(dev
, "Failed to suspend regulator %d\n", ret
);
4127 mutex_unlock(&rdev
->mutex
);
4129 /* Keep processing regulators in spite of any errors */
4134 * regulator_suspend_finish - resume regulators from system wide suspend
4136 * Turn on regulators that might be turned off by regulator_suspend_prepare
4137 * and that should be turned on according to the regulators properties.
4139 int regulator_suspend_finish(void)
4141 return class_for_each_device(®ulator_class
, NULL
, NULL
,
4142 _regulator_suspend_finish
);
4144 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
4147 * regulator_has_full_constraints - the system has fully specified constraints
4149 * Calling this function will cause the regulator API to disable all
4150 * regulators which have a zero use count and don't have an always_on
4151 * constraint in a late_initcall.
4153 * The intention is that this will become the default behaviour in a
4154 * future kernel release so users are encouraged to use this facility
4157 void regulator_has_full_constraints(void)
4159 has_full_constraints
= 1;
4161 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
4164 * rdev_get_drvdata - get rdev regulator driver data
4167 * Get rdev regulator driver private data. This call can be used in the
4168 * regulator driver context.
4170 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
4172 return rdev
->reg_data
;
4174 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
4177 * regulator_get_drvdata - get regulator driver data
4178 * @regulator: regulator
4180 * Get regulator driver private data. This call can be used in the consumer
4181 * driver context when non API regulator specific functions need to be called.
4183 void *regulator_get_drvdata(struct regulator
*regulator
)
4185 return regulator
->rdev
->reg_data
;
4187 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
4190 * regulator_set_drvdata - set regulator driver data
4191 * @regulator: regulator
4194 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
4196 regulator
->rdev
->reg_data
= data
;
4198 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
4201 * regulator_get_id - get regulator ID
4204 int rdev_get_id(struct regulator_dev
*rdev
)
4206 return rdev
->desc
->id
;
4208 EXPORT_SYMBOL_GPL(rdev_get_id
);
4210 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
4214 EXPORT_SYMBOL_GPL(rdev_get_dev
);
4216 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
4218 return reg_init_data
->driver_data
;
4220 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
4222 #ifdef CONFIG_DEBUG_FS
4223 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
4224 size_t count
, loff_t
*ppos
)
4226 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
4227 ssize_t len
, ret
= 0;
4228 struct regulator_map
*map
;
4233 list_for_each_entry(map
, ®ulator_map_list
, list
) {
4234 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
4236 rdev_get_name(map
->regulator
), map
->dev_name
,
4240 if (ret
> PAGE_SIZE
) {
4246 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
4254 static const struct file_operations supply_map_fops
= {
4255 #ifdef CONFIG_DEBUG_FS
4256 .read
= supply_map_read_file
,
4257 .llseek
= default_llseek
,
4261 #ifdef CONFIG_DEBUG_FS
4262 struct summary_data
{
4264 struct regulator_dev
*parent
;
4268 static void regulator_summary_show_subtree(struct seq_file
*s
,
4269 struct regulator_dev
*rdev
,
4272 static int regulator_summary_show_children(struct device
*dev
, void *data
)
4274 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4275 struct summary_data
*summary_data
= data
;
4277 if (rdev
->supply
&& rdev
->supply
->rdev
== summary_data
->parent
)
4278 regulator_summary_show_subtree(summary_data
->s
, rdev
,
4279 summary_data
->level
+ 1);
4284 static void regulator_summary_show_subtree(struct seq_file
*s
,
4285 struct regulator_dev
*rdev
,
4288 struct regulation_constraints
*c
;
4289 struct regulator
*consumer
;
4290 struct summary_data summary_data
;
4295 seq_printf(s
, "%*s%-*s %3d %4d %6d ",
4297 30 - level
* 3, rdev_get_name(rdev
),
4298 rdev
->use_count
, rdev
->open_count
, rdev
->bypass_count
);
4300 seq_printf(s
, "%5dmV ", _regulator_get_voltage(rdev
) / 1000);
4301 seq_printf(s
, "%5dmA ", _regulator_get_current_limit(rdev
) / 1000);
4303 c
= rdev
->constraints
;
4305 switch (rdev
->desc
->type
) {
4306 case REGULATOR_VOLTAGE
:
4307 seq_printf(s
, "%5dmV %5dmV ",
4308 c
->min_uV
/ 1000, c
->max_uV
/ 1000);
4310 case REGULATOR_CURRENT
:
4311 seq_printf(s
, "%5dmA %5dmA ",
4312 c
->min_uA
/ 1000, c
->max_uA
/ 1000);
4319 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
) {
4320 if (consumer
->dev
->class == ®ulator_class
)
4323 seq_printf(s
, "%*s%-*s ",
4324 (level
+ 1) * 3 + 1, "",
4325 30 - (level
+ 1) * 3, dev_name(consumer
->dev
));
4327 switch (rdev
->desc
->type
) {
4328 case REGULATOR_VOLTAGE
:
4329 seq_printf(s
, "%37dmV %5dmV",
4330 consumer
->min_uV
/ 1000,
4331 consumer
->max_uV
/ 1000);
4333 case REGULATOR_CURRENT
:
4341 summary_data
.level
= level
;
4342 summary_data
.parent
= rdev
;
4344 class_for_each_device(®ulator_class
, NULL
, &summary_data
,
4345 regulator_summary_show_children
);
4348 static int regulator_summary_show_roots(struct device
*dev
, void *data
)
4350 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4351 struct seq_file
*s
= data
;
4354 regulator_summary_show_subtree(s
, rdev
, 0);
4359 static int regulator_summary_show(struct seq_file
*s
, void *data
)
4361 seq_puts(s
, " regulator use open bypass voltage current min max\n");
4362 seq_puts(s
, "-------------------------------------------------------------------------------\n");
4364 class_for_each_device(®ulator_class
, NULL
, s
,
4365 regulator_summary_show_roots
);
4370 static int regulator_summary_open(struct inode
*inode
, struct file
*file
)
4372 return single_open(file
, regulator_summary_show
, inode
->i_private
);
4376 static const struct file_operations regulator_summary_fops
= {
4377 #ifdef CONFIG_DEBUG_FS
4378 .open
= regulator_summary_open
,
4380 .llseek
= seq_lseek
,
4381 .release
= single_release
,
4385 static int __init
regulator_init(void)
4389 ret
= class_register(®ulator_class
);
4391 debugfs_root
= debugfs_create_dir("regulator", NULL
);
4393 pr_warn("regulator: Failed to create debugfs directory\n");
4395 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
4398 debugfs_create_file("regulator_summary", 0444, debugfs_root
,
4399 NULL
, ®ulator_summary_fops
);
4401 regulator_dummy_init();
4406 /* init early to allow our consumers to complete system booting */
4407 core_initcall(regulator_init
);
4409 static int __init
regulator_late_cleanup(struct device
*dev
, void *data
)
4411 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4412 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
4413 struct regulation_constraints
*c
= rdev
->constraints
;
4416 if (c
&& c
->always_on
)
4419 if (c
&& !(c
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
))
4422 mutex_lock(&rdev
->mutex
);
4424 if (rdev
->use_count
)
4427 /* If we can't read the status assume it's on. */
4428 if (ops
->is_enabled
)
4429 enabled
= ops
->is_enabled(rdev
);
4436 if (have_full_constraints()) {
4437 /* We log since this may kill the system if it goes
4439 rdev_info(rdev
, "disabling\n");
4440 ret
= _regulator_do_disable(rdev
);
4442 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4444 /* The intention is that in future we will
4445 * assume that full constraints are provided
4446 * so warn even if we aren't going to do
4449 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4453 mutex_unlock(&rdev
->mutex
);
4458 static int __init
regulator_init_complete(void)
4461 * Since DT doesn't provide an idiomatic mechanism for
4462 * enabling full constraints and since it's much more natural
4463 * with DT to provide them just assume that a DT enabled
4464 * system has full constraints.
4466 if (of_have_populated_dt())
4467 has_full_constraints
= true;
4469 /* If we have a full configuration then disable any regulators
4470 * we have permission to change the status for and which are
4471 * not in use or always_on. This is effectively the default
4472 * for DT and ACPI as they have full constraints.
4474 class_for_each_device(®ulator_class
, NULL
, NULL
,
4475 regulator_late_cleanup
);
4479 late_initcall_sync(regulator_init_complete
);