2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
27 #include <linux/gpio/consumer.h>
29 #include <linux/regmap.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/module.h>
36 #define CREATE_TRACE_POINTS
37 #include <trace/events/regulator.h>
42 #define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 #define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
53 static DEFINE_MUTEX(regulator_list_mutex
);
54 static LIST_HEAD(regulator_list
);
55 static LIST_HEAD(regulator_map_list
);
56 static LIST_HEAD(regulator_ena_gpio_list
);
57 static LIST_HEAD(regulator_supply_alias_list
);
58 static bool has_full_constraints
;
60 static struct dentry
*debugfs_root
;
63 * struct regulator_map
65 * Used to provide symbolic supply names to devices.
67 struct regulator_map
{
68 struct list_head list
;
69 const char *dev_name
; /* The dev_name() for the consumer */
71 struct regulator_dev
*regulator
;
75 * struct regulator_enable_gpio
77 * Management for shared enable GPIO pin
79 struct regulator_enable_gpio
{
80 struct list_head list
;
81 struct gpio_desc
*gpiod
;
82 u32 enable_count
; /* a number of enabled shared GPIO */
83 u32 request_count
; /* a number of requested shared GPIO */
84 unsigned int ena_gpio_invert
:1;
88 * struct regulator_supply_alias
90 * Used to map lookups for a supply onto an alternative device.
92 struct regulator_supply_alias
{
93 struct list_head list
;
94 struct device
*src_dev
;
95 const char *src_supply
;
96 struct device
*alias_dev
;
97 const char *alias_supply
;
100 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
101 static int _regulator_disable(struct regulator_dev
*rdev
);
102 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
103 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
104 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
105 static int _notifier_call_chain(struct regulator_dev
*rdev
,
106 unsigned long event
, void *data
);
107 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
108 int min_uV
, int max_uV
);
109 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
111 const char *supply_name
);
113 static const char *rdev_get_name(struct regulator_dev
*rdev
)
115 if (rdev
->constraints
&& rdev
->constraints
->name
)
116 return rdev
->constraints
->name
;
117 else if (rdev
->desc
->name
)
118 return rdev
->desc
->name
;
123 static bool have_full_constraints(void)
125 return has_full_constraints
|| of_have_populated_dt();
129 * of_get_regulator - get a regulator device node based on supply name
130 * @dev: Device pointer for the consumer (of regulator) device
131 * @supply: regulator supply name
133 * Extract the regulator device node corresponding to the supply name.
134 * returns the device node corresponding to the regulator if found, else
137 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
139 struct device_node
*regnode
= NULL
;
140 char prop_name
[32]; /* 32 is max size of property name */
142 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
144 snprintf(prop_name
, 32, "%s-supply", supply
);
145 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
148 dev_dbg(dev
, "Looking up %s property in node %s failed",
149 prop_name
, dev
->of_node
->full_name
);
155 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
157 if (!rdev
->constraints
)
160 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
166 /* Platform voltage constraint check */
167 static int regulator_check_voltage(struct regulator_dev
*rdev
,
168 int *min_uV
, int *max_uV
)
170 BUG_ON(*min_uV
> *max_uV
);
172 if (!rdev
->constraints
) {
173 rdev_err(rdev
, "no constraints\n");
176 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
177 rdev_err(rdev
, "operation not allowed\n");
181 if (*max_uV
> rdev
->constraints
->max_uV
)
182 *max_uV
= rdev
->constraints
->max_uV
;
183 if (*min_uV
< rdev
->constraints
->min_uV
)
184 *min_uV
= rdev
->constraints
->min_uV
;
186 if (*min_uV
> *max_uV
) {
187 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
195 /* Make sure we select a voltage that suits the needs of all
196 * regulator consumers
198 static int regulator_check_consumers(struct regulator_dev
*rdev
,
199 int *min_uV
, int *max_uV
)
201 struct regulator
*regulator
;
203 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
205 * Assume consumers that didn't say anything are OK
206 * with anything in the constraint range.
208 if (!regulator
->min_uV
&& !regulator
->max_uV
)
211 if (*max_uV
> regulator
->max_uV
)
212 *max_uV
= regulator
->max_uV
;
213 if (*min_uV
< regulator
->min_uV
)
214 *min_uV
= regulator
->min_uV
;
217 if (*min_uV
> *max_uV
) {
218 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
226 /* current constraint check */
227 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
228 int *min_uA
, int *max_uA
)
230 BUG_ON(*min_uA
> *max_uA
);
232 if (!rdev
->constraints
) {
233 rdev_err(rdev
, "no constraints\n");
236 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
237 rdev_err(rdev
, "operation not allowed\n");
241 if (*max_uA
> rdev
->constraints
->max_uA
)
242 *max_uA
= rdev
->constraints
->max_uA
;
243 if (*min_uA
< rdev
->constraints
->min_uA
)
244 *min_uA
= rdev
->constraints
->min_uA
;
246 if (*min_uA
> *max_uA
) {
247 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
255 /* operating mode constraint check */
256 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
259 case REGULATOR_MODE_FAST
:
260 case REGULATOR_MODE_NORMAL
:
261 case REGULATOR_MODE_IDLE
:
262 case REGULATOR_MODE_STANDBY
:
265 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
269 if (!rdev
->constraints
) {
270 rdev_err(rdev
, "no constraints\n");
273 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
274 rdev_err(rdev
, "operation not allowed\n");
278 /* The modes are bitmasks, the most power hungry modes having
279 * the lowest values. If the requested mode isn't supported
280 * try higher modes. */
282 if (rdev
->constraints
->valid_modes_mask
& *mode
)
290 /* dynamic regulator mode switching constraint check */
291 static int regulator_check_drms(struct regulator_dev
*rdev
)
293 if (!rdev
->constraints
) {
294 rdev_err(rdev
, "no constraints\n");
297 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
298 rdev_dbg(rdev
, "operation not allowed\n");
304 static ssize_t
regulator_uV_show(struct device
*dev
,
305 struct device_attribute
*attr
, char *buf
)
307 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
310 mutex_lock(&rdev
->mutex
);
311 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
312 mutex_unlock(&rdev
->mutex
);
316 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
318 static ssize_t
regulator_uA_show(struct device
*dev
,
319 struct device_attribute
*attr
, char *buf
)
321 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
323 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
325 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
327 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
330 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
332 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
334 static DEVICE_ATTR_RO(name
);
336 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
339 case REGULATOR_MODE_FAST
:
340 return sprintf(buf
, "fast\n");
341 case REGULATOR_MODE_NORMAL
:
342 return sprintf(buf
, "normal\n");
343 case REGULATOR_MODE_IDLE
:
344 return sprintf(buf
, "idle\n");
345 case REGULATOR_MODE_STANDBY
:
346 return sprintf(buf
, "standby\n");
348 return sprintf(buf
, "unknown\n");
351 static ssize_t
regulator_opmode_show(struct device
*dev
,
352 struct device_attribute
*attr
, char *buf
)
354 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
356 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
358 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
360 static ssize_t
regulator_print_state(char *buf
, int state
)
363 return sprintf(buf
, "enabled\n");
365 return sprintf(buf
, "disabled\n");
367 return sprintf(buf
, "unknown\n");
370 static ssize_t
regulator_state_show(struct device
*dev
,
371 struct device_attribute
*attr
, char *buf
)
373 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
376 mutex_lock(&rdev
->mutex
);
377 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
378 mutex_unlock(&rdev
->mutex
);
382 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
384 static ssize_t
regulator_status_show(struct device
*dev
,
385 struct device_attribute
*attr
, char *buf
)
387 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
391 status
= rdev
->desc
->ops
->get_status(rdev
);
396 case REGULATOR_STATUS_OFF
:
399 case REGULATOR_STATUS_ON
:
402 case REGULATOR_STATUS_ERROR
:
405 case REGULATOR_STATUS_FAST
:
408 case REGULATOR_STATUS_NORMAL
:
411 case REGULATOR_STATUS_IDLE
:
414 case REGULATOR_STATUS_STANDBY
:
417 case REGULATOR_STATUS_BYPASS
:
420 case REGULATOR_STATUS_UNDEFINED
:
427 return sprintf(buf
, "%s\n", label
);
429 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
431 static ssize_t
regulator_min_uA_show(struct device
*dev
,
432 struct device_attribute
*attr
, char *buf
)
434 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
436 if (!rdev
->constraints
)
437 return sprintf(buf
, "constraint not defined\n");
439 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
441 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
443 static ssize_t
regulator_max_uA_show(struct device
*dev
,
444 struct device_attribute
*attr
, char *buf
)
446 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
448 if (!rdev
->constraints
)
449 return sprintf(buf
, "constraint not defined\n");
451 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
453 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
455 static ssize_t
regulator_min_uV_show(struct device
*dev
,
456 struct device_attribute
*attr
, char *buf
)
458 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
460 if (!rdev
->constraints
)
461 return sprintf(buf
, "constraint not defined\n");
463 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
465 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
467 static ssize_t
regulator_max_uV_show(struct device
*dev
,
468 struct device_attribute
*attr
, char *buf
)
470 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
472 if (!rdev
->constraints
)
473 return sprintf(buf
, "constraint not defined\n");
475 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
477 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
479 static ssize_t
regulator_total_uA_show(struct device
*dev
,
480 struct device_attribute
*attr
, char *buf
)
482 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
483 struct regulator
*regulator
;
486 mutex_lock(&rdev
->mutex
);
487 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
488 uA
+= regulator
->uA_load
;
489 mutex_unlock(&rdev
->mutex
);
490 return sprintf(buf
, "%d\n", uA
);
492 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
494 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
497 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
498 return sprintf(buf
, "%d\n", rdev
->use_count
);
500 static DEVICE_ATTR_RO(num_users
);
502 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
505 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
507 switch (rdev
->desc
->type
) {
508 case REGULATOR_VOLTAGE
:
509 return sprintf(buf
, "voltage\n");
510 case REGULATOR_CURRENT
:
511 return sprintf(buf
, "current\n");
513 return sprintf(buf
, "unknown\n");
515 static DEVICE_ATTR_RO(type
);
517 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
518 struct device_attribute
*attr
, char *buf
)
520 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
522 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
524 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
525 regulator_suspend_mem_uV_show
, NULL
);
527 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
528 struct device_attribute
*attr
, char *buf
)
530 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
532 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
534 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
535 regulator_suspend_disk_uV_show
, NULL
);
537 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
538 struct device_attribute
*attr
, char *buf
)
540 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
542 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
544 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
545 regulator_suspend_standby_uV_show
, NULL
);
547 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
548 struct device_attribute
*attr
, char *buf
)
550 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
552 return regulator_print_opmode(buf
,
553 rdev
->constraints
->state_mem
.mode
);
555 static DEVICE_ATTR(suspend_mem_mode
, 0444,
556 regulator_suspend_mem_mode_show
, NULL
);
558 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
559 struct device_attribute
*attr
, char *buf
)
561 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
563 return regulator_print_opmode(buf
,
564 rdev
->constraints
->state_disk
.mode
);
566 static DEVICE_ATTR(suspend_disk_mode
, 0444,
567 regulator_suspend_disk_mode_show
, NULL
);
569 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
570 struct device_attribute
*attr
, char *buf
)
572 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
574 return regulator_print_opmode(buf
,
575 rdev
->constraints
->state_standby
.mode
);
577 static DEVICE_ATTR(suspend_standby_mode
, 0444,
578 regulator_suspend_standby_mode_show
, NULL
);
580 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
581 struct device_attribute
*attr
, char *buf
)
583 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
585 return regulator_print_state(buf
,
586 rdev
->constraints
->state_mem
.enabled
);
588 static DEVICE_ATTR(suspend_mem_state
, 0444,
589 regulator_suspend_mem_state_show
, NULL
);
591 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
592 struct device_attribute
*attr
, char *buf
)
594 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
596 return regulator_print_state(buf
,
597 rdev
->constraints
->state_disk
.enabled
);
599 static DEVICE_ATTR(suspend_disk_state
, 0444,
600 regulator_suspend_disk_state_show
, NULL
);
602 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
603 struct device_attribute
*attr
, char *buf
)
605 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
607 return regulator_print_state(buf
,
608 rdev
->constraints
->state_standby
.enabled
);
610 static DEVICE_ATTR(suspend_standby_state
, 0444,
611 regulator_suspend_standby_state_show
, NULL
);
613 static ssize_t
regulator_bypass_show(struct device
*dev
,
614 struct device_attribute
*attr
, char *buf
)
616 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
621 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
630 return sprintf(buf
, "%s\n", report
);
632 static DEVICE_ATTR(bypass
, 0444,
633 regulator_bypass_show
, NULL
);
635 /* Calculate the new optimum regulator operating mode based on the new total
636 * consumer load. All locks held by caller */
637 static int drms_uA_update(struct regulator_dev
*rdev
)
639 struct regulator
*sibling
;
640 int current_uA
= 0, output_uV
, input_uV
, err
;
643 lockdep_assert_held_once(&rdev
->mutex
);
646 * first check to see if we can set modes at all, otherwise just
647 * tell the consumer everything is OK.
649 err
= regulator_check_drms(rdev
);
653 if (!rdev
->desc
->ops
->get_optimum_mode
&&
654 !rdev
->desc
->ops
->set_load
)
657 if (!rdev
->desc
->ops
->set_mode
&&
658 !rdev
->desc
->ops
->set_load
)
661 /* get output voltage */
662 output_uV
= _regulator_get_voltage(rdev
);
663 if (output_uV
<= 0) {
664 rdev_err(rdev
, "invalid output voltage found\n");
668 /* get input voltage */
671 input_uV
= regulator_get_voltage(rdev
->supply
);
673 input_uV
= rdev
->constraints
->input_uV
;
675 rdev_err(rdev
, "invalid input voltage found\n");
679 /* calc total requested load */
680 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
681 current_uA
+= sibling
->uA_load
;
683 current_uA
+= rdev
->constraints
->system_load
;
685 if (rdev
->desc
->ops
->set_load
) {
686 /* set the optimum mode for our new total regulator load */
687 err
= rdev
->desc
->ops
->set_load(rdev
, current_uA
);
689 rdev_err(rdev
, "failed to set load %d\n", current_uA
);
691 /* now get the optimum mode for our new total regulator load */
692 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
693 output_uV
, current_uA
);
695 /* check the new mode is allowed */
696 err
= regulator_mode_constrain(rdev
, &mode
);
698 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
699 current_uA
, input_uV
, output_uV
);
703 err
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
705 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
711 static int suspend_set_state(struct regulator_dev
*rdev
,
712 struct regulator_state
*rstate
)
716 /* If we have no suspend mode configration don't set anything;
717 * only warn if the driver implements set_suspend_voltage or
718 * set_suspend_mode callback.
720 if (!rstate
->enabled
&& !rstate
->disabled
) {
721 if (rdev
->desc
->ops
->set_suspend_voltage
||
722 rdev
->desc
->ops
->set_suspend_mode
)
723 rdev_warn(rdev
, "No configuration\n");
727 if (rstate
->enabled
&& rstate
->disabled
) {
728 rdev_err(rdev
, "invalid configuration\n");
732 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
733 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
734 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
735 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
736 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
740 rdev_err(rdev
, "failed to enabled/disable\n");
744 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
745 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
747 rdev_err(rdev
, "failed to set voltage\n");
752 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
753 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
755 rdev_err(rdev
, "failed to set mode\n");
762 /* locks held by caller */
763 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
765 lockdep_assert_held_once(&rdev
->mutex
);
767 if (!rdev
->constraints
)
771 case PM_SUSPEND_STANDBY
:
772 return suspend_set_state(rdev
,
773 &rdev
->constraints
->state_standby
);
775 return suspend_set_state(rdev
,
776 &rdev
->constraints
->state_mem
);
778 return suspend_set_state(rdev
,
779 &rdev
->constraints
->state_disk
);
785 static void print_constraints(struct regulator_dev
*rdev
)
787 struct regulation_constraints
*constraints
= rdev
->constraints
;
789 size_t len
= sizeof(buf
) - 1;
793 if (constraints
->min_uV
&& constraints
->max_uV
) {
794 if (constraints
->min_uV
== constraints
->max_uV
)
795 count
+= scnprintf(buf
+ count
, len
- count
, "%d mV ",
796 constraints
->min_uV
/ 1000);
798 count
+= scnprintf(buf
+ count
, len
- count
,
800 constraints
->min_uV
/ 1000,
801 constraints
->max_uV
/ 1000);
804 if (!constraints
->min_uV
||
805 constraints
->min_uV
!= constraints
->max_uV
) {
806 ret
= _regulator_get_voltage(rdev
);
808 count
+= scnprintf(buf
+ count
, len
- count
,
809 "at %d mV ", ret
/ 1000);
812 if (constraints
->uV_offset
)
813 count
+= scnprintf(buf
+ count
, len
- count
, "%dmV offset ",
814 constraints
->uV_offset
/ 1000);
816 if (constraints
->min_uA
&& constraints
->max_uA
) {
817 if (constraints
->min_uA
== constraints
->max_uA
)
818 count
+= scnprintf(buf
+ count
, len
- count
, "%d mA ",
819 constraints
->min_uA
/ 1000);
821 count
+= scnprintf(buf
+ count
, len
- count
,
823 constraints
->min_uA
/ 1000,
824 constraints
->max_uA
/ 1000);
827 if (!constraints
->min_uA
||
828 constraints
->min_uA
!= constraints
->max_uA
) {
829 ret
= _regulator_get_current_limit(rdev
);
831 count
+= scnprintf(buf
+ count
, len
- count
,
832 "at %d mA ", ret
/ 1000);
835 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
836 count
+= scnprintf(buf
+ count
, len
- count
, "fast ");
837 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
838 count
+= scnprintf(buf
+ count
, len
- count
, "normal ");
839 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
840 count
+= scnprintf(buf
+ count
, len
- count
, "idle ");
841 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
842 count
+= scnprintf(buf
+ count
, len
- count
, "standby");
845 scnprintf(buf
, len
, "no parameters");
847 rdev_dbg(rdev
, "%s\n", buf
);
849 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
850 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
852 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
855 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
856 struct regulation_constraints
*constraints
)
858 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
861 /* do we need to apply the constraint voltage */
862 if (rdev
->constraints
->apply_uV
&&
863 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
864 int current_uV
= _regulator_get_voltage(rdev
);
865 if (current_uV
< 0) {
867 "failed to get the current voltage(%d)\n",
871 if (current_uV
< rdev
->constraints
->min_uV
||
872 current_uV
> rdev
->constraints
->max_uV
) {
873 ret
= _regulator_do_set_voltage(
874 rdev
, rdev
->constraints
->min_uV
,
875 rdev
->constraints
->max_uV
);
878 "failed to apply %duV constraint(%d)\n",
879 rdev
->constraints
->min_uV
, ret
);
885 /* constrain machine-level voltage specs to fit
886 * the actual range supported by this regulator.
888 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
889 int count
= rdev
->desc
->n_voltages
;
891 int min_uV
= INT_MAX
;
892 int max_uV
= INT_MIN
;
893 int cmin
= constraints
->min_uV
;
894 int cmax
= constraints
->max_uV
;
896 /* it's safe to autoconfigure fixed-voltage supplies
897 and the constraints are used by list_voltage. */
898 if (count
== 1 && !cmin
) {
901 constraints
->min_uV
= cmin
;
902 constraints
->max_uV
= cmax
;
905 /* voltage constraints are optional */
906 if ((cmin
== 0) && (cmax
== 0))
909 /* else require explicit machine-level constraints */
910 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
911 rdev_err(rdev
, "invalid voltage constraints\n");
915 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
916 for (i
= 0; i
< count
; i
++) {
919 value
= ops
->list_voltage(rdev
, i
);
923 /* maybe adjust [min_uV..max_uV] */
924 if (value
>= cmin
&& value
< min_uV
)
926 if (value
<= cmax
&& value
> max_uV
)
930 /* final: [min_uV..max_uV] valid iff constraints valid */
931 if (max_uV
< min_uV
) {
933 "unsupportable voltage constraints %u-%uuV\n",
938 /* use regulator's subset of machine constraints */
939 if (constraints
->min_uV
< min_uV
) {
940 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
941 constraints
->min_uV
, min_uV
);
942 constraints
->min_uV
= min_uV
;
944 if (constraints
->max_uV
> max_uV
) {
945 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
946 constraints
->max_uV
, max_uV
);
947 constraints
->max_uV
= max_uV
;
954 static int machine_constraints_current(struct regulator_dev
*rdev
,
955 struct regulation_constraints
*constraints
)
957 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
960 if (!constraints
->min_uA
&& !constraints
->max_uA
)
963 if (constraints
->min_uA
> constraints
->max_uA
) {
964 rdev_err(rdev
, "Invalid current constraints\n");
968 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
969 rdev_warn(rdev
, "Operation of current configuration missing\n");
973 /* Set regulator current in constraints range */
974 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
975 constraints
->max_uA
);
977 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
984 static int _regulator_do_enable(struct regulator_dev
*rdev
);
987 * set_machine_constraints - sets regulator constraints
988 * @rdev: regulator source
989 * @constraints: constraints to apply
991 * Allows platform initialisation code to define and constrain
992 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
993 * Constraints *must* be set by platform code in order for some
994 * regulator operations to proceed i.e. set_voltage, set_current_limit,
997 static int set_machine_constraints(struct regulator_dev
*rdev
,
998 const struct regulation_constraints
*constraints
)
1001 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1004 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
1007 rdev
->constraints
= kzalloc(sizeof(*constraints
),
1009 if (!rdev
->constraints
)
1012 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
1016 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
1020 if (rdev
->constraints
->ilim_uA
&& ops
->set_input_current_limit
) {
1021 ret
= ops
->set_input_current_limit(rdev
,
1022 rdev
->constraints
->ilim_uA
);
1024 rdev_err(rdev
, "failed to set input limit\n");
1029 /* do we need to setup our suspend state */
1030 if (rdev
->constraints
->initial_state
) {
1031 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
1033 rdev_err(rdev
, "failed to set suspend state\n");
1038 if (rdev
->constraints
->initial_mode
) {
1039 if (!ops
->set_mode
) {
1040 rdev_err(rdev
, "no set_mode operation\n");
1045 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1047 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1052 /* If the constraints say the regulator should be on at this point
1053 * and we have control then make sure it is enabled.
1055 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
1056 ret
= _regulator_do_enable(rdev
);
1057 if (ret
< 0 && ret
!= -EINVAL
) {
1058 rdev_err(rdev
, "failed to enable\n");
1063 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1064 && ops
->set_ramp_delay
) {
1065 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1067 rdev_err(rdev
, "failed to set ramp_delay\n");
1072 if (rdev
->constraints
->pull_down
&& ops
->set_pull_down
) {
1073 ret
= ops
->set_pull_down(rdev
);
1075 rdev_err(rdev
, "failed to set pull down\n");
1080 if (rdev
->constraints
->soft_start
&& ops
->set_soft_start
) {
1081 ret
= ops
->set_soft_start(rdev
);
1083 rdev_err(rdev
, "failed to set soft start\n");
1088 print_constraints(rdev
);
1091 kfree(rdev
->constraints
);
1092 rdev
->constraints
= NULL
;
1097 * set_supply - set regulator supply regulator
1098 * @rdev: regulator name
1099 * @supply_rdev: supply regulator name
1101 * Called by platform initialisation code to set the supply regulator for this
1102 * regulator. This ensures that a regulators supply will also be enabled by the
1103 * core if it's child is enabled.
1105 static int set_supply(struct regulator_dev
*rdev
,
1106 struct regulator_dev
*supply_rdev
)
1110 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1112 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1113 if (rdev
->supply
== NULL
) {
1117 supply_rdev
->open_count
++;
1123 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1124 * @rdev: regulator source
1125 * @consumer_dev_name: dev_name() string for device supply applies to
1126 * @supply: symbolic name for supply
1128 * Allows platform initialisation code to map physical regulator
1129 * sources to symbolic names for supplies for use by devices. Devices
1130 * should use these symbolic names to request regulators, avoiding the
1131 * need to provide board-specific regulator names as platform data.
1133 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1134 const char *consumer_dev_name
,
1137 struct regulator_map
*node
;
1143 if (consumer_dev_name
!= NULL
)
1148 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1149 if (node
->dev_name
&& consumer_dev_name
) {
1150 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1152 } else if (node
->dev_name
|| consumer_dev_name
) {
1156 if (strcmp(node
->supply
, supply
) != 0)
1159 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1161 dev_name(&node
->regulator
->dev
),
1162 node
->regulator
->desc
->name
,
1164 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1168 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1172 node
->regulator
= rdev
;
1173 node
->supply
= supply
;
1176 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1177 if (node
->dev_name
== NULL
) {
1183 list_add(&node
->list
, ®ulator_map_list
);
1187 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1189 struct regulator_map
*node
, *n
;
1191 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1192 if (rdev
== node
->regulator
) {
1193 list_del(&node
->list
);
1194 kfree(node
->dev_name
);
1200 #define REG_STR_SIZE 64
1202 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1204 const char *supply_name
)
1206 struct regulator
*regulator
;
1207 char buf
[REG_STR_SIZE
];
1210 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1211 if (regulator
== NULL
)
1214 mutex_lock(&rdev
->mutex
);
1215 regulator
->rdev
= rdev
;
1216 list_add(®ulator
->list
, &rdev
->consumer_list
);
1219 regulator
->dev
= dev
;
1221 /* Add a link to the device sysfs entry */
1222 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1223 dev
->kobj
.name
, supply_name
);
1224 if (size
>= REG_STR_SIZE
)
1227 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1228 if (regulator
->supply_name
== NULL
)
1231 err
= sysfs_create_link_nowarn(&rdev
->dev
.kobj
, &dev
->kobj
,
1234 rdev_dbg(rdev
, "could not add device link %s err %d\n",
1235 dev
->kobj
.name
, err
);
1239 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1240 if (regulator
->supply_name
== NULL
)
1244 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1246 if (!regulator
->debugfs
) {
1247 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1249 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1250 ®ulator
->uA_load
);
1251 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1252 ®ulator
->min_uV
);
1253 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1254 ®ulator
->max_uV
);
1258 * Check now if the regulator is an always on regulator - if
1259 * it is then we don't need to do nearly so much work for
1260 * enable/disable calls.
1262 if (!_regulator_can_change_status(rdev
) &&
1263 _regulator_is_enabled(rdev
))
1264 regulator
->always_on
= true;
1266 mutex_unlock(&rdev
->mutex
);
1269 list_del(®ulator
->list
);
1271 mutex_unlock(&rdev
->mutex
);
1275 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1277 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1278 return rdev
->constraints
->enable_time
;
1279 if (!rdev
->desc
->ops
->enable_time
)
1280 return rdev
->desc
->enable_time
;
1281 return rdev
->desc
->ops
->enable_time(rdev
);
1284 static struct regulator_supply_alias
*regulator_find_supply_alias(
1285 struct device
*dev
, const char *supply
)
1287 struct regulator_supply_alias
*map
;
1289 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1290 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1296 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1298 struct regulator_supply_alias
*map
;
1300 map
= regulator_find_supply_alias(*dev
, *supply
);
1302 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1303 *supply
, map
->alias_supply
,
1304 dev_name(map
->alias_dev
));
1305 *dev
= map
->alias_dev
;
1306 *supply
= map
->alias_supply
;
1310 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1314 struct regulator_dev
*r
;
1315 struct device_node
*node
;
1316 struct regulator_map
*map
;
1317 const char *devname
= NULL
;
1319 regulator_supply_alias(&dev
, &supply
);
1321 /* first do a dt based lookup */
1322 if (dev
&& dev
->of_node
) {
1323 node
= of_get_regulator(dev
, supply
);
1325 list_for_each_entry(r
, ®ulator_list
, list
)
1326 if (r
->dev
.parent
&&
1327 node
== r
->dev
.of_node
)
1329 *ret
= -EPROBE_DEFER
;
1333 * If we couldn't even get the node then it's
1334 * not just that the device didn't register
1335 * yet, there's no node and we'll never
1342 /* if not found, try doing it non-dt way */
1344 devname
= dev_name(dev
);
1346 list_for_each_entry(r
, ®ulator_list
, list
)
1347 if (strcmp(rdev_get_name(r
), supply
) == 0)
1350 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1351 /* If the mapping has a device set up it must match */
1352 if (map
->dev_name
&&
1353 (!devname
|| strcmp(map
->dev_name
, devname
)))
1356 if (strcmp(map
->supply
, supply
) == 0)
1357 return map
->regulator
;
1364 static int regulator_resolve_supply(struct regulator_dev
*rdev
)
1366 struct regulator_dev
*r
;
1367 struct device
*dev
= rdev
->dev
.parent
;
1370 /* No supply to resovle? */
1371 if (!rdev
->supply_name
)
1374 /* Supply already resolved? */
1378 r
= regulator_dev_lookup(dev
, rdev
->supply_name
, &ret
);
1379 if (ret
== -ENODEV
) {
1381 * No supply was specified for this regulator and
1382 * there will never be one.
1388 dev_err(dev
, "Failed to resolve %s-supply for %s\n",
1389 rdev
->supply_name
, rdev
->desc
->name
);
1390 return -EPROBE_DEFER
;
1393 /* Recursively resolve the supply of the supply */
1394 ret
= regulator_resolve_supply(r
);
1398 ret
= set_supply(rdev
, r
);
1402 /* Cascade always-on state to supply */
1403 if (_regulator_is_enabled(rdev
)) {
1404 ret
= regulator_enable(rdev
->supply
);
1412 /* Internal regulator request function */
1413 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1414 bool exclusive
, bool allow_dummy
)
1416 struct regulator_dev
*rdev
;
1417 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1418 const char *devname
= NULL
;
1422 pr_err("get() with no identifier\n");
1423 return ERR_PTR(-EINVAL
);
1427 devname
= dev_name(dev
);
1429 if (have_full_constraints())
1432 ret
= -EPROBE_DEFER
;
1434 mutex_lock(®ulator_list_mutex
);
1436 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1440 regulator
= ERR_PTR(ret
);
1443 * If we have return value from dev_lookup fail, we do not expect to
1444 * succeed, so, quit with appropriate error value
1446 if (ret
&& ret
!= -ENODEV
)
1450 devname
= "deviceless";
1453 * Assume that a regulator is physically present and enabled
1454 * even if it isn't hooked up and just provide a dummy.
1456 if (have_full_constraints() && allow_dummy
) {
1457 pr_warn("%s supply %s not found, using dummy regulator\n",
1460 rdev
= dummy_regulator_rdev
;
1462 /* Don't log an error when called from regulator_get_optional() */
1463 } else if (!have_full_constraints() || exclusive
) {
1464 dev_warn(dev
, "dummy supplies not allowed\n");
1467 mutex_unlock(®ulator_list_mutex
);
1471 if (rdev
->exclusive
) {
1472 regulator
= ERR_PTR(-EPERM
);
1476 if (exclusive
&& rdev
->open_count
) {
1477 regulator
= ERR_PTR(-EBUSY
);
1481 ret
= regulator_resolve_supply(rdev
);
1483 regulator
= ERR_PTR(ret
);
1487 if (!try_module_get(rdev
->owner
))
1490 regulator
= create_regulator(rdev
, dev
, id
);
1491 if (regulator
== NULL
) {
1492 regulator
= ERR_PTR(-ENOMEM
);
1493 module_put(rdev
->owner
);
1499 rdev
->exclusive
= 1;
1501 ret
= _regulator_is_enabled(rdev
);
1503 rdev
->use_count
= 1;
1505 rdev
->use_count
= 0;
1509 mutex_unlock(®ulator_list_mutex
);
1515 * regulator_get - lookup and obtain a reference to a regulator.
1516 * @dev: device for regulator "consumer"
1517 * @id: Supply name or regulator ID.
1519 * Returns a struct regulator corresponding to the regulator producer,
1520 * or IS_ERR() condition containing errno.
1522 * Use of supply names configured via regulator_set_device_supply() is
1523 * strongly encouraged. It is recommended that the supply name used
1524 * should match the name used for the supply and/or the relevant
1525 * device pins in the datasheet.
1527 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1529 return _regulator_get(dev
, id
, false, true);
1531 EXPORT_SYMBOL_GPL(regulator_get
);
1534 * regulator_get_exclusive - obtain exclusive access to a regulator.
1535 * @dev: device for regulator "consumer"
1536 * @id: Supply name or regulator ID.
1538 * Returns a struct regulator corresponding to the regulator producer,
1539 * or IS_ERR() condition containing errno. Other consumers will be
1540 * unable to obtain this regulator while this reference is held and the
1541 * use count for the regulator will be initialised to reflect the current
1542 * state of the regulator.
1544 * This is intended for use by consumers which cannot tolerate shared
1545 * use of the regulator such as those which need to force the
1546 * regulator off for correct operation of the hardware they are
1549 * Use of supply names configured via regulator_set_device_supply() is
1550 * strongly encouraged. It is recommended that the supply name used
1551 * should match the name used for the supply and/or the relevant
1552 * device pins in the datasheet.
1554 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1556 return _regulator_get(dev
, id
, true, false);
1558 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1561 * regulator_get_optional - obtain optional access to a regulator.
1562 * @dev: device for regulator "consumer"
1563 * @id: Supply name or regulator ID.
1565 * Returns a struct regulator corresponding to the regulator producer,
1566 * or IS_ERR() condition containing errno.
1568 * This is intended for use by consumers for devices which can have
1569 * some supplies unconnected in normal use, such as some MMC devices.
1570 * It can allow the regulator core to provide stub supplies for other
1571 * supplies requested using normal regulator_get() calls without
1572 * disrupting the operation of drivers that can handle absent
1575 * Use of supply names configured via regulator_set_device_supply() is
1576 * strongly encouraged. It is recommended that the supply name used
1577 * should match the name used for the supply and/or the relevant
1578 * device pins in the datasheet.
1580 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1582 return _regulator_get(dev
, id
, false, false);
1584 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1586 /* regulator_list_mutex lock held by regulator_put() */
1587 static void _regulator_put(struct regulator
*regulator
)
1589 struct regulator_dev
*rdev
;
1591 if (IS_ERR_OR_NULL(regulator
))
1594 lockdep_assert_held_once(®ulator_list_mutex
);
1596 rdev
= regulator
->rdev
;
1598 debugfs_remove_recursive(regulator
->debugfs
);
1600 /* remove any sysfs entries */
1602 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1603 mutex_lock(&rdev
->mutex
);
1604 kfree(regulator
->supply_name
);
1605 list_del(®ulator
->list
);
1609 rdev
->exclusive
= 0;
1610 mutex_unlock(&rdev
->mutex
);
1612 module_put(rdev
->owner
);
1616 * regulator_put - "free" the regulator source
1617 * @regulator: regulator source
1619 * Note: drivers must ensure that all regulator_enable calls made on this
1620 * regulator source are balanced by regulator_disable calls prior to calling
1623 void regulator_put(struct regulator
*regulator
)
1625 mutex_lock(®ulator_list_mutex
);
1626 _regulator_put(regulator
);
1627 mutex_unlock(®ulator_list_mutex
);
1629 EXPORT_SYMBOL_GPL(regulator_put
);
1632 * regulator_register_supply_alias - Provide device alias for supply lookup
1634 * @dev: device that will be given as the regulator "consumer"
1635 * @id: Supply name or regulator ID
1636 * @alias_dev: device that should be used to lookup the supply
1637 * @alias_id: Supply name or regulator ID that should be used to lookup the
1640 * All lookups for id on dev will instead be conducted for alias_id on
1643 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1644 struct device
*alias_dev
,
1645 const char *alias_id
)
1647 struct regulator_supply_alias
*map
;
1649 map
= regulator_find_supply_alias(dev
, id
);
1653 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1658 map
->src_supply
= id
;
1659 map
->alias_dev
= alias_dev
;
1660 map
->alias_supply
= alias_id
;
1662 list_add(&map
->list
, ®ulator_supply_alias_list
);
1664 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1665 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1669 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1672 * regulator_unregister_supply_alias - Remove device alias
1674 * @dev: device that will be given as the regulator "consumer"
1675 * @id: Supply name or regulator ID
1677 * Remove a lookup alias if one exists for id on dev.
1679 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1681 struct regulator_supply_alias
*map
;
1683 map
= regulator_find_supply_alias(dev
, id
);
1685 list_del(&map
->list
);
1689 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1692 * regulator_bulk_register_supply_alias - register multiple aliases
1694 * @dev: device that will be given as the regulator "consumer"
1695 * @id: List of supply names or regulator IDs
1696 * @alias_dev: device that should be used to lookup the supply
1697 * @alias_id: List of supply names or regulator IDs that should be used to
1699 * @num_id: Number of aliases to register
1701 * @return 0 on success, an errno on failure.
1703 * This helper function allows drivers to register several supply
1704 * aliases in one operation. If any of the aliases cannot be
1705 * registered any aliases that were registered will be removed
1706 * before returning to the caller.
1708 int regulator_bulk_register_supply_alias(struct device
*dev
,
1709 const char *const *id
,
1710 struct device
*alias_dev
,
1711 const char *const *alias_id
,
1717 for (i
= 0; i
< num_id
; ++i
) {
1718 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1728 "Failed to create supply alias %s,%s -> %s,%s\n",
1729 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1732 regulator_unregister_supply_alias(dev
, id
[i
]);
1736 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1739 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1741 * @dev: device that will be given as the regulator "consumer"
1742 * @id: List of supply names or regulator IDs
1743 * @num_id: Number of aliases to unregister
1745 * This helper function allows drivers to unregister several supply
1746 * aliases in one operation.
1748 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1749 const char *const *id
,
1754 for (i
= 0; i
< num_id
; ++i
)
1755 regulator_unregister_supply_alias(dev
, id
[i
]);
1757 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1760 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1761 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1762 const struct regulator_config
*config
)
1764 struct regulator_enable_gpio
*pin
;
1765 struct gpio_desc
*gpiod
;
1768 gpiod
= gpio_to_desc(config
->ena_gpio
);
1770 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1771 if (pin
->gpiod
== gpiod
) {
1772 rdev_dbg(rdev
, "GPIO %d is already used\n",
1774 goto update_ena_gpio_to_rdev
;
1778 ret
= gpio_request_one(config
->ena_gpio
,
1779 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1780 rdev_get_name(rdev
));
1784 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1786 gpio_free(config
->ena_gpio
);
1791 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1792 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1794 update_ena_gpio_to_rdev
:
1795 pin
->request_count
++;
1796 rdev
->ena_pin
= pin
;
1800 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1802 struct regulator_enable_gpio
*pin
, *n
;
1807 /* Free the GPIO only in case of no use */
1808 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1809 if (pin
->gpiod
== rdev
->ena_pin
->gpiod
) {
1810 if (pin
->request_count
<= 1) {
1811 pin
->request_count
= 0;
1812 gpiod_put(pin
->gpiod
);
1813 list_del(&pin
->list
);
1815 rdev
->ena_pin
= NULL
;
1818 pin
->request_count
--;
1825 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1826 * @rdev: regulator_dev structure
1827 * @enable: enable GPIO at initial use?
1829 * GPIO is enabled in case of initial use. (enable_count is 0)
1830 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1832 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1834 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1840 /* Enable GPIO at initial use */
1841 if (pin
->enable_count
== 0)
1842 gpiod_set_value_cansleep(pin
->gpiod
,
1843 !pin
->ena_gpio_invert
);
1845 pin
->enable_count
++;
1847 if (pin
->enable_count
> 1) {
1848 pin
->enable_count
--;
1852 /* Disable GPIO if not used */
1853 if (pin
->enable_count
<= 1) {
1854 gpiod_set_value_cansleep(pin
->gpiod
,
1855 pin
->ena_gpio_invert
);
1856 pin
->enable_count
= 0;
1864 * _regulator_enable_delay - a delay helper function
1865 * @delay: time to delay in microseconds
1867 * Delay for the requested amount of time as per the guidelines in:
1869 * Documentation/timers/timers-howto.txt
1871 * The assumption here is that regulators will never be enabled in
1872 * atomic context and therefore sleeping functions can be used.
1874 static void _regulator_enable_delay(unsigned int delay
)
1876 unsigned int ms
= delay
/ 1000;
1877 unsigned int us
= delay
% 1000;
1881 * For small enough values, handle super-millisecond
1882 * delays in the usleep_range() call below.
1891 * Give the scheduler some room to coalesce with any other
1892 * wakeup sources. For delays shorter than 10 us, don't even
1893 * bother setting up high-resolution timers and just busy-
1897 usleep_range(us
, us
+ 100);
1902 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1906 /* Query before enabling in case configuration dependent. */
1907 ret
= _regulator_get_enable_time(rdev
);
1911 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1915 trace_regulator_enable(rdev_get_name(rdev
));
1917 if (rdev
->desc
->off_on_delay
) {
1918 /* if needed, keep a distance of off_on_delay from last time
1919 * this regulator was disabled.
1921 unsigned long start_jiffy
= jiffies
;
1922 unsigned long intended
, max_delay
, remaining
;
1924 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
1925 intended
= rdev
->last_off_jiffy
+ max_delay
;
1927 if (time_before(start_jiffy
, intended
)) {
1928 /* calc remaining jiffies to deal with one-time
1930 * in case of multiple timer wrapping, either it can be
1931 * detected by out-of-range remaining, or it cannot be
1932 * detected and we gets a panelty of
1933 * _regulator_enable_delay().
1935 remaining
= intended
- start_jiffy
;
1936 if (remaining
<= max_delay
)
1937 _regulator_enable_delay(
1938 jiffies_to_usecs(remaining
));
1942 if (rdev
->ena_pin
) {
1943 if (!rdev
->ena_gpio_state
) {
1944 ret
= regulator_ena_gpio_ctrl(rdev
, true);
1947 rdev
->ena_gpio_state
= 1;
1949 } else if (rdev
->desc
->ops
->enable
) {
1950 ret
= rdev
->desc
->ops
->enable(rdev
);
1957 /* Allow the regulator to ramp; it would be useful to extend
1958 * this for bulk operations so that the regulators can ramp
1960 trace_regulator_enable_delay(rdev_get_name(rdev
));
1962 _regulator_enable_delay(delay
);
1964 trace_regulator_enable_complete(rdev_get_name(rdev
));
1969 /* locks held by regulator_enable() */
1970 static int _regulator_enable(struct regulator_dev
*rdev
)
1974 lockdep_assert_held_once(&rdev
->mutex
);
1976 /* check voltage and requested load before enabling */
1977 if (rdev
->constraints
&&
1978 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1979 drms_uA_update(rdev
);
1981 if (rdev
->use_count
== 0) {
1982 /* The regulator may on if it's not switchable or left on */
1983 ret
= _regulator_is_enabled(rdev
);
1984 if (ret
== -EINVAL
|| ret
== 0) {
1985 if (!_regulator_can_change_status(rdev
))
1988 ret
= _regulator_do_enable(rdev
);
1992 } else if (ret
< 0) {
1993 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1996 /* Fallthrough on positive return values - already enabled */
2005 * regulator_enable - enable regulator output
2006 * @regulator: regulator source
2008 * Request that the regulator be enabled with the regulator output at
2009 * the predefined voltage or current value. Calls to regulator_enable()
2010 * must be balanced with calls to regulator_disable().
2012 * NOTE: the output value can be set by other drivers, boot loader or may be
2013 * hardwired in the regulator.
2015 int regulator_enable(struct regulator
*regulator
)
2017 struct regulator_dev
*rdev
= regulator
->rdev
;
2020 if (regulator
->always_on
)
2024 ret
= regulator_enable(rdev
->supply
);
2029 mutex_lock(&rdev
->mutex
);
2030 ret
= _regulator_enable(rdev
);
2031 mutex_unlock(&rdev
->mutex
);
2033 if (ret
!= 0 && rdev
->supply
)
2034 regulator_disable(rdev
->supply
);
2038 EXPORT_SYMBOL_GPL(regulator_enable
);
2040 static int _regulator_do_disable(struct regulator_dev
*rdev
)
2044 trace_regulator_disable(rdev_get_name(rdev
));
2046 if (rdev
->ena_pin
) {
2047 if (rdev
->ena_gpio_state
) {
2048 ret
= regulator_ena_gpio_ctrl(rdev
, false);
2051 rdev
->ena_gpio_state
= 0;
2054 } else if (rdev
->desc
->ops
->disable
) {
2055 ret
= rdev
->desc
->ops
->disable(rdev
);
2060 /* cares about last_off_jiffy only if off_on_delay is required by
2063 if (rdev
->desc
->off_on_delay
)
2064 rdev
->last_off_jiffy
= jiffies
;
2066 trace_regulator_disable_complete(rdev_get_name(rdev
));
2071 /* locks held by regulator_disable() */
2072 static int _regulator_disable(struct regulator_dev
*rdev
)
2076 lockdep_assert_held_once(&rdev
->mutex
);
2078 if (WARN(rdev
->use_count
<= 0,
2079 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
2082 /* are we the last user and permitted to disable ? */
2083 if (rdev
->use_count
== 1 &&
2084 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
2086 /* we are last user */
2087 if (_regulator_can_change_status(rdev
)) {
2088 ret
= _notifier_call_chain(rdev
,
2089 REGULATOR_EVENT_PRE_DISABLE
,
2091 if (ret
& NOTIFY_STOP_MASK
)
2094 ret
= _regulator_do_disable(rdev
);
2096 rdev_err(rdev
, "failed to disable\n");
2097 _notifier_call_chain(rdev
,
2098 REGULATOR_EVENT_ABORT_DISABLE
,
2102 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
2106 rdev
->use_count
= 0;
2107 } else if (rdev
->use_count
> 1) {
2109 if (rdev
->constraints
&&
2110 (rdev
->constraints
->valid_ops_mask
&
2111 REGULATOR_CHANGE_DRMS
))
2112 drms_uA_update(rdev
);
2121 * regulator_disable - disable regulator output
2122 * @regulator: regulator source
2124 * Disable the regulator output voltage or current. Calls to
2125 * regulator_enable() must be balanced with calls to
2126 * regulator_disable().
2128 * NOTE: this will only disable the regulator output if no other consumer
2129 * devices have it enabled, the regulator device supports disabling and
2130 * machine constraints permit this operation.
2132 int regulator_disable(struct regulator
*regulator
)
2134 struct regulator_dev
*rdev
= regulator
->rdev
;
2137 if (regulator
->always_on
)
2140 mutex_lock(&rdev
->mutex
);
2141 ret
= _regulator_disable(rdev
);
2142 mutex_unlock(&rdev
->mutex
);
2144 if (ret
== 0 && rdev
->supply
)
2145 regulator_disable(rdev
->supply
);
2149 EXPORT_SYMBOL_GPL(regulator_disable
);
2151 /* locks held by regulator_force_disable() */
2152 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2156 lockdep_assert_held_once(&rdev
->mutex
);
2158 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2159 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2160 if (ret
& NOTIFY_STOP_MASK
)
2163 ret
= _regulator_do_disable(rdev
);
2165 rdev_err(rdev
, "failed to force disable\n");
2166 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2167 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2171 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2172 REGULATOR_EVENT_DISABLE
, NULL
);
2178 * regulator_force_disable - force disable regulator output
2179 * @regulator: regulator source
2181 * Forcibly disable the regulator output voltage or current.
2182 * NOTE: this *will* disable the regulator output even if other consumer
2183 * devices have it enabled. This should be used for situations when device
2184 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2186 int regulator_force_disable(struct regulator
*regulator
)
2188 struct regulator_dev
*rdev
= regulator
->rdev
;
2191 mutex_lock(&rdev
->mutex
);
2192 regulator
->uA_load
= 0;
2193 ret
= _regulator_force_disable(regulator
->rdev
);
2194 mutex_unlock(&rdev
->mutex
);
2197 while (rdev
->open_count
--)
2198 regulator_disable(rdev
->supply
);
2202 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2204 static void regulator_disable_work(struct work_struct
*work
)
2206 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2210 mutex_lock(&rdev
->mutex
);
2212 BUG_ON(!rdev
->deferred_disables
);
2214 count
= rdev
->deferred_disables
;
2215 rdev
->deferred_disables
= 0;
2217 for (i
= 0; i
< count
; i
++) {
2218 ret
= _regulator_disable(rdev
);
2220 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2223 mutex_unlock(&rdev
->mutex
);
2226 for (i
= 0; i
< count
; i
++) {
2227 ret
= regulator_disable(rdev
->supply
);
2230 "Supply disable failed: %d\n", ret
);
2237 * regulator_disable_deferred - disable regulator output with delay
2238 * @regulator: regulator source
2239 * @ms: miliseconds until the regulator is disabled
2241 * Execute regulator_disable() on the regulator after a delay. This
2242 * is intended for use with devices that require some time to quiesce.
2244 * NOTE: this will only disable the regulator output if no other consumer
2245 * devices have it enabled, the regulator device supports disabling and
2246 * machine constraints permit this operation.
2248 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2250 struct regulator_dev
*rdev
= regulator
->rdev
;
2253 if (regulator
->always_on
)
2257 return regulator_disable(regulator
);
2259 mutex_lock(&rdev
->mutex
);
2260 rdev
->deferred_disables
++;
2261 mutex_unlock(&rdev
->mutex
);
2263 ret
= queue_delayed_work(system_power_efficient_wq
,
2264 &rdev
->disable_work
,
2265 msecs_to_jiffies(ms
));
2271 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2273 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2275 /* A GPIO control always takes precedence */
2277 return rdev
->ena_gpio_state
;
2279 /* If we don't know then assume that the regulator is always on */
2280 if (!rdev
->desc
->ops
->is_enabled
)
2283 return rdev
->desc
->ops
->is_enabled(rdev
);
2287 * regulator_is_enabled - is the regulator output enabled
2288 * @regulator: regulator source
2290 * Returns positive if the regulator driver backing the source/client
2291 * has requested that the device be enabled, zero if it hasn't, else a
2292 * negative errno code.
2294 * Note that the device backing this regulator handle can have multiple
2295 * users, so it might be enabled even if regulator_enable() was never
2296 * called for this particular source.
2298 int regulator_is_enabled(struct regulator
*regulator
)
2302 if (regulator
->always_on
)
2305 mutex_lock(®ulator
->rdev
->mutex
);
2306 ret
= _regulator_is_enabled(regulator
->rdev
);
2307 mutex_unlock(®ulator
->rdev
->mutex
);
2311 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2314 * regulator_can_change_voltage - check if regulator can change voltage
2315 * @regulator: regulator source
2317 * Returns positive if the regulator driver backing the source/client
2318 * can change its voltage, false otherwise. Useful for detecting fixed
2319 * or dummy regulators and disabling voltage change logic in the client
2322 int regulator_can_change_voltage(struct regulator
*regulator
)
2324 struct regulator_dev
*rdev
= regulator
->rdev
;
2326 if (rdev
->constraints
&&
2327 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2328 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2331 if (rdev
->desc
->continuous_voltage_range
&&
2332 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2333 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2339 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2342 * regulator_count_voltages - count regulator_list_voltage() selectors
2343 * @regulator: regulator source
2345 * Returns number of selectors, or negative errno. Selectors are
2346 * numbered starting at zero, and typically correspond to bitfields
2347 * in hardware registers.
2349 int regulator_count_voltages(struct regulator
*regulator
)
2351 struct regulator_dev
*rdev
= regulator
->rdev
;
2353 if (rdev
->desc
->n_voltages
)
2354 return rdev
->desc
->n_voltages
;
2359 return regulator_count_voltages(rdev
->supply
);
2361 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2364 * regulator_list_voltage - enumerate supported voltages
2365 * @regulator: regulator source
2366 * @selector: identify voltage to list
2367 * Context: can sleep
2369 * Returns a voltage that can be passed to @regulator_set_voltage(),
2370 * zero if this selector code can't be used on this system, or a
2373 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2375 struct regulator_dev
*rdev
= regulator
->rdev
;
2376 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2379 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2380 return rdev
->desc
->fixed_uV
;
2382 if (ops
->list_voltage
) {
2383 if (selector
>= rdev
->desc
->n_voltages
)
2385 mutex_lock(&rdev
->mutex
);
2386 ret
= ops
->list_voltage(rdev
, selector
);
2387 mutex_unlock(&rdev
->mutex
);
2388 } else if (rdev
->supply
) {
2389 ret
= regulator_list_voltage(rdev
->supply
, selector
);
2395 if (ret
< rdev
->constraints
->min_uV
)
2397 else if (ret
> rdev
->constraints
->max_uV
)
2403 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2406 * regulator_get_regmap - get the regulator's register map
2407 * @regulator: regulator source
2409 * Returns the register map for the given regulator, or an ERR_PTR value
2410 * if the regulator doesn't use regmap.
2412 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
2414 struct regmap
*map
= regulator
->rdev
->regmap
;
2416 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
2420 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2421 * @regulator: regulator source
2422 * @vsel_reg: voltage selector register, output parameter
2423 * @vsel_mask: mask for voltage selector bitfield, output parameter
2425 * Returns the hardware register offset and bitmask used for setting the
2426 * regulator voltage. This might be useful when configuring voltage-scaling
2427 * hardware or firmware that can make I2C requests behind the kernel's back,
2430 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2431 * and 0 is returned, otherwise a negative errno is returned.
2433 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
2435 unsigned *vsel_mask
)
2437 struct regulator_dev
*rdev
= regulator
->rdev
;
2438 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2440 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2443 *vsel_reg
= rdev
->desc
->vsel_reg
;
2444 *vsel_mask
= rdev
->desc
->vsel_mask
;
2448 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
2451 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2452 * @regulator: regulator source
2453 * @selector: identify voltage to list
2455 * Converts the selector to a hardware-specific voltage selector that can be
2456 * directly written to the regulator registers. The address of the voltage
2457 * register can be determined by calling @regulator_get_hardware_vsel_register.
2459 * On error a negative errno is returned.
2461 int regulator_list_hardware_vsel(struct regulator
*regulator
,
2464 struct regulator_dev
*rdev
= regulator
->rdev
;
2465 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2467 if (selector
>= rdev
->desc
->n_voltages
)
2469 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2474 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
2477 * regulator_get_linear_step - return the voltage step size between VSEL values
2478 * @regulator: regulator source
2480 * Returns the voltage step size between VSEL values for linear
2481 * regulators, or return 0 if the regulator isn't a linear regulator.
2483 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2485 struct regulator_dev
*rdev
= regulator
->rdev
;
2487 return rdev
->desc
->uV_step
;
2489 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2492 * regulator_is_supported_voltage - check if a voltage range can be supported
2494 * @regulator: Regulator to check.
2495 * @min_uV: Minimum required voltage in uV.
2496 * @max_uV: Maximum required voltage in uV.
2498 * Returns a boolean or a negative error code.
2500 int regulator_is_supported_voltage(struct regulator
*regulator
,
2501 int min_uV
, int max_uV
)
2503 struct regulator_dev
*rdev
= regulator
->rdev
;
2504 int i
, voltages
, ret
;
2506 /* If we can't change voltage check the current voltage */
2507 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2508 ret
= regulator_get_voltage(regulator
);
2510 return min_uV
<= ret
&& ret
<= max_uV
;
2515 /* Any voltage within constrains range is fine? */
2516 if (rdev
->desc
->continuous_voltage_range
)
2517 return min_uV
>= rdev
->constraints
->min_uV
&&
2518 max_uV
<= rdev
->constraints
->max_uV
;
2520 ret
= regulator_count_voltages(regulator
);
2525 for (i
= 0; i
< voltages
; i
++) {
2526 ret
= regulator_list_voltage(regulator
, i
);
2528 if (ret
>= min_uV
&& ret
<= max_uV
)
2534 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2536 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
2537 int min_uV
, int max_uV
,
2540 struct pre_voltage_change_data data
;
2543 data
.old_uV
= _regulator_get_voltage(rdev
);
2544 data
.min_uV
= min_uV
;
2545 data
.max_uV
= max_uV
;
2546 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2548 if (ret
& NOTIFY_STOP_MASK
)
2551 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
2555 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2556 (void *)data
.old_uV
);
2561 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
2562 int uV
, unsigned selector
)
2564 struct pre_voltage_change_data data
;
2567 data
.old_uV
= _regulator_get_voltage(rdev
);
2570 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2572 if (ret
& NOTIFY_STOP_MASK
)
2575 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
2579 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2580 (void *)data
.old_uV
);
2585 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2586 int min_uV
, int max_uV
)
2591 unsigned int selector
;
2592 int old_selector
= -1;
2594 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2596 min_uV
+= rdev
->constraints
->uV_offset
;
2597 max_uV
+= rdev
->constraints
->uV_offset
;
2600 * If we can't obtain the old selector there is not enough
2601 * info to call set_voltage_time_sel().
2603 if (_regulator_is_enabled(rdev
) &&
2604 rdev
->desc
->ops
->set_voltage_time_sel
&&
2605 rdev
->desc
->ops
->get_voltage_sel
) {
2606 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2607 if (old_selector
< 0)
2608 return old_selector
;
2611 if (rdev
->desc
->ops
->set_voltage
) {
2612 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
2616 if (rdev
->desc
->ops
->list_voltage
)
2617 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2620 best_val
= _regulator_get_voltage(rdev
);
2623 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2624 if (rdev
->desc
->ops
->map_voltage
) {
2625 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2628 if (rdev
->desc
->ops
->list_voltage
==
2629 regulator_list_voltage_linear
)
2630 ret
= regulator_map_voltage_linear(rdev
,
2632 else if (rdev
->desc
->ops
->list_voltage
==
2633 regulator_list_voltage_linear_range
)
2634 ret
= regulator_map_voltage_linear_range(rdev
,
2637 ret
= regulator_map_voltage_iterate(rdev
,
2642 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2643 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2645 if (old_selector
== selector
)
2648 ret
= _regulator_call_set_voltage_sel(
2649 rdev
, best_val
, selector
);
2658 /* Call set_voltage_time_sel if successfully obtained old_selector */
2659 if (ret
== 0 && !rdev
->constraints
->ramp_disable
&& old_selector
>= 0
2660 && old_selector
!= selector
) {
2662 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2663 old_selector
, selector
);
2665 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2670 /* Insert any necessary delays */
2671 if (delay
>= 1000) {
2672 mdelay(delay
/ 1000);
2673 udelay(delay
% 1000);
2679 if (ret
== 0 && best_val
>= 0) {
2680 unsigned long data
= best_val
;
2682 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2686 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2692 * regulator_set_voltage - set regulator output voltage
2693 * @regulator: regulator source
2694 * @min_uV: Minimum required voltage in uV
2695 * @max_uV: Maximum acceptable voltage in uV
2697 * Sets a voltage regulator to the desired output voltage. This can be set
2698 * during any regulator state. IOW, regulator can be disabled or enabled.
2700 * If the regulator is enabled then the voltage will change to the new value
2701 * immediately otherwise if the regulator is disabled the regulator will
2702 * output at the new voltage when enabled.
2704 * NOTE: If the regulator is shared between several devices then the lowest
2705 * request voltage that meets the system constraints will be used.
2706 * Regulator system constraints must be set for this regulator before
2707 * calling this function otherwise this call will fail.
2709 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2711 struct regulator_dev
*rdev
= regulator
->rdev
;
2713 int old_min_uV
, old_max_uV
;
2716 mutex_lock(&rdev
->mutex
);
2718 /* If we're setting the same range as last time the change
2719 * should be a noop (some cpufreq implementations use the same
2720 * voltage for multiple frequencies, for example).
2722 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2725 /* If we're trying to set a range that overlaps the current voltage,
2726 * return successfully even though the regulator does not support
2727 * changing the voltage.
2729 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2730 current_uV
= _regulator_get_voltage(rdev
);
2731 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
2732 regulator
->min_uV
= min_uV
;
2733 regulator
->max_uV
= max_uV
;
2739 if (!rdev
->desc
->ops
->set_voltage
&&
2740 !rdev
->desc
->ops
->set_voltage_sel
) {
2745 /* constraints check */
2746 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2750 /* restore original values in case of error */
2751 old_min_uV
= regulator
->min_uV
;
2752 old_max_uV
= regulator
->max_uV
;
2753 regulator
->min_uV
= min_uV
;
2754 regulator
->max_uV
= max_uV
;
2756 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2760 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2765 mutex_unlock(&rdev
->mutex
);
2768 regulator
->min_uV
= old_min_uV
;
2769 regulator
->max_uV
= old_max_uV
;
2770 mutex_unlock(&rdev
->mutex
);
2773 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2776 * regulator_set_voltage_time - get raise/fall time
2777 * @regulator: regulator source
2778 * @old_uV: starting voltage in microvolts
2779 * @new_uV: target voltage in microvolts
2781 * Provided with the starting and ending voltage, this function attempts to
2782 * calculate the time in microseconds required to rise or fall to this new
2785 int regulator_set_voltage_time(struct regulator
*regulator
,
2786 int old_uV
, int new_uV
)
2788 struct regulator_dev
*rdev
= regulator
->rdev
;
2789 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2795 /* Currently requires operations to do this */
2796 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2797 || !rdev
->desc
->n_voltages
)
2800 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2801 /* We only look for exact voltage matches here */
2802 voltage
= regulator_list_voltage(regulator
, i
);
2807 if (voltage
== old_uV
)
2809 if (voltage
== new_uV
)
2813 if (old_sel
< 0 || new_sel
< 0)
2816 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2818 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2821 * regulator_set_voltage_time_sel - get raise/fall time
2822 * @rdev: regulator source device
2823 * @old_selector: selector for starting voltage
2824 * @new_selector: selector for target voltage
2826 * Provided with the starting and target voltage selectors, this function
2827 * returns time in microseconds required to rise or fall to this new voltage
2829 * Drivers providing ramp_delay in regulation_constraints can use this as their
2830 * set_voltage_time_sel() operation.
2832 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2833 unsigned int old_selector
,
2834 unsigned int new_selector
)
2836 unsigned int ramp_delay
= 0;
2837 int old_volt
, new_volt
;
2839 if (rdev
->constraints
->ramp_delay
)
2840 ramp_delay
= rdev
->constraints
->ramp_delay
;
2841 else if (rdev
->desc
->ramp_delay
)
2842 ramp_delay
= rdev
->desc
->ramp_delay
;
2844 if (ramp_delay
== 0) {
2845 rdev_warn(rdev
, "ramp_delay not set\n");
2850 if (!rdev
->desc
->ops
->list_voltage
)
2853 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2854 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2856 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2858 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2861 * regulator_sync_voltage - re-apply last regulator output voltage
2862 * @regulator: regulator source
2864 * Re-apply the last configured voltage. This is intended to be used
2865 * where some external control source the consumer is cooperating with
2866 * has caused the configured voltage to change.
2868 int regulator_sync_voltage(struct regulator
*regulator
)
2870 struct regulator_dev
*rdev
= regulator
->rdev
;
2871 int ret
, min_uV
, max_uV
;
2873 mutex_lock(&rdev
->mutex
);
2875 if (!rdev
->desc
->ops
->set_voltage
&&
2876 !rdev
->desc
->ops
->set_voltage_sel
) {
2881 /* This is only going to work if we've had a voltage configured. */
2882 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2887 min_uV
= regulator
->min_uV
;
2888 max_uV
= regulator
->max_uV
;
2890 /* This should be a paranoia check... */
2891 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2895 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2899 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2902 mutex_unlock(&rdev
->mutex
);
2905 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2907 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2911 if (rdev
->desc
->ops
->get_voltage_sel
) {
2912 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2915 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2916 } else if (rdev
->desc
->ops
->get_voltage
) {
2917 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2918 } else if (rdev
->desc
->ops
->list_voltage
) {
2919 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2920 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
2921 ret
= rdev
->desc
->fixed_uV
;
2922 } else if (rdev
->supply
) {
2923 ret
= regulator_get_voltage(rdev
->supply
);
2930 return ret
- rdev
->constraints
->uV_offset
;
2934 * regulator_get_voltage - get regulator output voltage
2935 * @regulator: regulator source
2937 * This returns the current regulator voltage in uV.
2939 * NOTE: If the regulator is disabled it will return the voltage value. This
2940 * function should not be used to determine regulator state.
2942 int regulator_get_voltage(struct regulator
*regulator
)
2946 mutex_lock(®ulator
->rdev
->mutex
);
2948 ret
= _regulator_get_voltage(regulator
->rdev
);
2950 mutex_unlock(®ulator
->rdev
->mutex
);
2954 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2957 * regulator_set_current_limit - set regulator output current limit
2958 * @regulator: regulator source
2959 * @min_uA: Minimum supported current in uA
2960 * @max_uA: Maximum supported current in uA
2962 * Sets current sink to the desired output current. This can be set during
2963 * any regulator state. IOW, regulator can be disabled or enabled.
2965 * If the regulator is enabled then the current will change to the new value
2966 * immediately otherwise if the regulator is disabled the regulator will
2967 * output at the new current when enabled.
2969 * NOTE: Regulator system constraints must be set for this regulator before
2970 * calling this function otherwise this call will fail.
2972 int regulator_set_current_limit(struct regulator
*regulator
,
2973 int min_uA
, int max_uA
)
2975 struct regulator_dev
*rdev
= regulator
->rdev
;
2978 mutex_lock(&rdev
->mutex
);
2981 if (!rdev
->desc
->ops
->set_current_limit
) {
2986 /* constraints check */
2987 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2991 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2993 mutex_unlock(&rdev
->mutex
);
2996 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2998 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
3002 mutex_lock(&rdev
->mutex
);
3005 if (!rdev
->desc
->ops
->get_current_limit
) {
3010 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
3012 mutex_unlock(&rdev
->mutex
);
3017 * regulator_get_current_limit - get regulator output current
3018 * @regulator: regulator source
3020 * This returns the current supplied by the specified current sink in uA.
3022 * NOTE: If the regulator is disabled it will return the current value. This
3023 * function should not be used to determine regulator state.
3025 int regulator_get_current_limit(struct regulator
*regulator
)
3027 return _regulator_get_current_limit(regulator
->rdev
);
3029 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
3032 * regulator_set_mode - set regulator operating mode
3033 * @regulator: regulator source
3034 * @mode: operating mode - one of the REGULATOR_MODE constants
3036 * Set regulator operating mode to increase regulator efficiency or improve
3037 * regulation performance.
3039 * NOTE: Regulator system constraints must be set for this regulator before
3040 * calling this function otherwise this call will fail.
3042 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
3044 struct regulator_dev
*rdev
= regulator
->rdev
;
3046 int regulator_curr_mode
;
3048 mutex_lock(&rdev
->mutex
);
3051 if (!rdev
->desc
->ops
->set_mode
) {
3056 /* return if the same mode is requested */
3057 if (rdev
->desc
->ops
->get_mode
) {
3058 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
3059 if (regulator_curr_mode
== mode
) {
3065 /* constraints check */
3066 ret
= regulator_mode_constrain(rdev
, &mode
);
3070 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
3072 mutex_unlock(&rdev
->mutex
);
3075 EXPORT_SYMBOL_GPL(regulator_set_mode
);
3077 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
3081 mutex_lock(&rdev
->mutex
);
3084 if (!rdev
->desc
->ops
->get_mode
) {
3089 ret
= rdev
->desc
->ops
->get_mode(rdev
);
3091 mutex_unlock(&rdev
->mutex
);
3096 * regulator_get_mode - get regulator operating mode
3097 * @regulator: regulator source
3099 * Get the current regulator operating mode.
3101 unsigned int regulator_get_mode(struct regulator
*regulator
)
3103 return _regulator_get_mode(regulator
->rdev
);
3105 EXPORT_SYMBOL_GPL(regulator_get_mode
);
3108 * regulator_set_load - set regulator load
3109 * @regulator: regulator source
3110 * @uA_load: load current
3112 * Notifies the regulator core of a new device load. This is then used by
3113 * DRMS (if enabled by constraints) to set the most efficient regulator
3114 * operating mode for the new regulator loading.
3116 * Consumer devices notify their supply regulator of the maximum power
3117 * they will require (can be taken from device datasheet in the power
3118 * consumption tables) when they change operational status and hence power
3119 * state. Examples of operational state changes that can affect power
3120 * consumption are :-
3122 * o Device is opened / closed.
3123 * o Device I/O is about to begin or has just finished.
3124 * o Device is idling in between work.
3126 * This information is also exported via sysfs to userspace.
3128 * DRMS will sum the total requested load on the regulator and change
3129 * to the most efficient operating mode if platform constraints allow.
3131 * On error a negative errno is returned.
3133 int regulator_set_load(struct regulator
*regulator
, int uA_load
)
3135 struct regulator_dev
*rdev
= regulator
->rdev
;
3138 mutex_lock(&rdev
->mutex
);
3139 regulator
->uA_load
= uA_load
;
3140 ret
= drms_uA_update(rdev
);
3141 mutex_unlock(&rdev
->mutex
);
3145 EXPORT_SYMBOL_GPL(regulator_set_load
);
3148 * regulator_allow_bypass - allow the regulator to go into bypass mode
3150 * @regulator: Regulator to configure
3151 * @enable: enable or disable bypass mode
3153 * Allow the regulator to go into bypass mode if all other consumers
3154 * for the regulator also enable bypass mode and the machine
3155 * constraints allow this. Bypass mode means that the regulator is
3156 * simply passing the input directly to the output with no regulation.
3158 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3160 struct regulator_dev
*rdev
= regulator
->rdev
;
3163 if (!rdev
->desc
->ops
->set_bypass
)
3166 if (rdev
->constraints
&&
3167 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
3170 mutex_lock(&rdev
->mutex
);
3172 if (enable
&& !regulator
->bypass
) {
3173 rdev
->bypass_count
++;
3175 if (rdev
->bypass_count
== rdev
->open_count
) {
3176 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3178 rdev
->bypass_count
--;
3181 } else if (!enable
&& regulator
->bypass
) {
3182 rdev
->bypass_count
--;
3184 if (rdev
->bypass_count
!= rdev
->open_count
) {
3185 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3187 rdev
->bypass_count
++;
3192 regulator
->bypass
= enable
;
3194 mutex_unlock(&rdev
->mutex
);
3198 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3201 * regulator_register_notifier - register regulator event notifier
3202 * @regulator: regulator source
3203 * @nb: notifier block
3205 * Register notifier block to receive regulator events.
3207 int regulator_register_notifier(struct regulator
*regulator
,
3208 struct notifier_block
*nb
)
3210 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3213 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3216 * regulator_unregister_notifier - unregister regulator event notifier
3217 * @regulator: regulator source
3218 * @nb: notifier block
3220 * Unregister regulator event notifier block.
3222 int regulator_unregister_notifier(struct regulator
*regulator
,
3223 struct notifier_block
*nb
)
3225 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3228 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3230 /* notify regulator consumers and downstream regulator consumers.
3231 * Note mutex must be held by caller.
3233 static int _notifier_call_chain(struct regulator_dev
*rdev
,
3234 unsigned long event
, void *data
)
3236 /* call rdev chain first */
3237 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3241 * regulator_bulk_get - get multiple regulator consumers
3243 * @dev: Device to supply
3244 * @num_consumers: Number of consumers to register
3245 * @consumers: Configuration of consumers; clients are stored here.
3247 * @return 0 on success, an errno on failure.
3249 * This helper function allows drivers to get several regulator
3250 * consumers in one operation. If any of the regulators cannot be
3251 * acquired then any regulators that were allocated will be freed
3252 * before returning to the caller.
3254 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3255 struct regulator_bulk_data
*consumers
)
3260 for (i
= 0; i
< num_consumers
; i
++)
3261 consumers
[i
].consumer
= NULL
;
3263 for (i
= 0; i
< num_consumers
; i
++) {
3264 consumers
[i
].consumer
= regulator_get(dev
,
3265 consumers
[i
].supply
);
3266 if (IS_ERR(consumers
[i
].consumer
)) {
3267 ret
= PTR_ERR(consumers
[i
].consumer
);
3268 dev_err(dev
, "Failed to get supply '%s': %d\n",
3269 consumers
[i
].supply
, ret
);
3270 consumers
[i
].consumer
= NULL
;
3279 regulator_put(consumers
[i
].consumer
);
3283 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3285 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3287 struct regulator_bulk_data
*bulk
= data
;
3289 bulk
->ret
= regulator_enable(bulk
->consumer
);
3293 * regulator_bulk_enable - enable multiple regulator consumers
3295 * @num_consumers: Number of consumers
3296 * @consumers: Consumer data; clients are stored here.
3297 * @return 0 on success, an errno on failure
3299 * This convenience API allows consumers to enable multiple regulator
3300 * clients in a single API call. If any consumers cannot be enabled
3301 * then any others that were enabled will be disabled again prior to
3304 int regulator_bulk_enable(int num_consumers
,
3305 struct regulator_bulk_data
*consumers
)
3307 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3311 for (i
= 0; i
< num_consumers
; i
++) {
3312 if (consumers
[i
].consumer
->always_on
)
3313 consumers
[i
].ret
= 0;
3315 async_schedule_domain(regulator_bulk_enable_async
,
3316 &consumers
[i
], &async_domain
);
3319 async_synchronize_full_domain(&async_domain
);
3321 /* If any consumer failed we need to unwind any that succeeded */
3322 for (i
= 0; i
< num_consumers
; i
++) {
3323 if (consumers
[i
].ret
!= 0) {
3324 ret
= consumers
[i
].ret
;
3332 for (i
= 0; i
< num_consumers
; i
++) {
3333 if (consumers
[i
].ret
< 0)
3334 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3337 regulator_disable(consumers
[i
].consumer
);
3342 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3345 * regulator_bulk_disable - disable multiple regulator consumers
3347 * @num_consumers: Number of consumers
3348 * @consumers: Consumer data; clients are stored here.
3349 * @return 0 on success, an errno on failure
3351 * This convenience API allows consumers to disable multiple regulator
3352 * clients in a single API call. If any consumers cannot be disabled
3353 * then any others that were disabled will be enabled again prior to
3356 int regulator_bulk_disable(int num_consumers
,
3357 struct regulator_bulk_data
*consumers
)
3362 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3363 ret
= regulator_disable(consumers
[i
].consumer
);
3371 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3372 for (++i
; i
< num_consumers
; ++i
) {
3373 r
= regulator_enable(consumers
[i
].consumer
);
3375 pr_err("Failed to reename %s: %d\n",
3376 consumers
[i
].supply
, r
);
3381 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3384 * regulator_bulk_force_disable - force disable multiple regulator consumers
3386 * @num_consumers: Number of consumers
3387 * @consumers: Consumer data; clients are stored here.
3388 * @return 0 on success, an errno on failure
3390 * This convenience API allows consumers to forcibly disable multiple regulator
3391 * clients in a single API call.
3392 * NOTE: This should be used for situations when device damage will
3393 * likely occur if the regulators are not disabled (e.g. over temp).
3394 * Although regulator_force_disable function call for some consumers can
3395 * return error numbers, the function is called for all consumers.
3397 int regulator_bulk_force_disable(int num_consumers
,
3398 struct regulator_bulk_data
*consumers
)
3403 for (i
= 0; i
< num_consumers
; i
++)
3405 regulator_force_disable(consumers
[i
].consumer
);
3407 for (i
= 0; i
< num_consumers
; i
++) {
3408 if (consumers
[i
].ret
!= 0) {
3409 ret
= consumers
[i
].ret
;
3418 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3421 * regulator_bulk_free - free multiple regulator consumers
3423 * @num_consumers: Number of consumers
3424 * @consumers: Consumer data; clients are stored here.
3426 * This convenience API allows consumers to free multiple regulator
3427 * clients in a single API call.
3429 void regulator_bulk_free(int num_consumers
,
3430 struct regulator_bulk_data
*consumers
)
3434 for (i
= 0; i
< num_consumers
; i
++) {
3435 regulator_put(consumers
[i
].consumer
);
3436 consumers
[i
].consumer
= NULL
;
3439 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3442 * regulator_notifier_call_chain - call regulator event notifier
3443 * @rdev: regulator source
3444 * @event: notifier block
3445 * @data: callback-specific data.
3447 * Called by regulator drivers to notify clients a regulator event has
3448 * occurred. We also notify regulator clients downstream.
3449 * Note lock must be held by caller.
3451 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3452 unsigned long event
, void *data
)
3454 lockdep_assert_held_once(&rdev
->mutex
);
3456 _notifier_call_chain(rdev
, event
, data
);
3460 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3463 * regulator_mode_to_status - convert a regulator mode into a status
3465 * @mode: Mode to convert
3467 * Convert a regulator mode into a status.
3469 int regulator_mode_to_status(unsigned int mode
)
3472 case REGULATOR_MODE_FAST
:
3473 return REGULATOR_STATUS_FAST
;
3474 case REGULATOR_MODE_NORMAL
:
3475 return REGULATOR_STATUS_NORMAL
;
3476 case REGULATOR_MODE_IDLE
:
3477 return REGULATOR_STATUS_IDLE
;
3478 case REGULATOR_MODE_STANDBY
:
3479 return REGULATOR_STATUS_STANDBY
;
3481 return REGULATOR_STATUS_UNDEFINED
;
3484 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3486 static struct attribute
*regulator_dev_attrs
[] = {
3487 &dev_attr_name
.attr
,
3488 &dev_attr_num_users
.attr
,
3489 &dev_attr_type
.attr
,
3490 &dev_attr_microvolts
.attr
,
3491 &dev_attr_microamps
.attr
,
3492 &dev_attr_opmode
.attr
,
3493 &dev_attr_state
.attr
,
3494 &dev_attr_status
.attr
,
3495 &dev_attr_bypass
.attr
,
3496 &dev_attr_requested_microamps
.attr
,
3497 &dev_attr_min_microvolts
.attr
,
3498 &dev_attr_max_microvolts
.attr
,
3499 &dev_attr_min_microamps
.attr
,
3500 &dev_attr_max_microamps
.attr
,
3501 &dev_attr_suspend_standby_state
.attr
,
3502 &dev_attr_suspend_mem_state
.attr
,
3503 &dev_attr_suspend_disk_state
.attr
,
3504 &dev_attr_suspend_standby_microvolts
.attr
,
3505 &dev_attr_suspend_mem_microvolts
.attr
,
3506 &dev_attr_suspend_disk_microvolts
.attr
,
3507 &dev_attr_suspend_standby_mode
.attr
,
3508 &dev_attr_suspend_mem_mode
.attr
,
3509 &dev_attr_suspend_disk_mode
.attr
,
3514 * To avoid cluttering sysfs (and memory) with useless state, only
3515 * create attributes that can be meaningfully displayed.
3517 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
3518 struct attribute
*attr
, int idx
)
3520 struct device
*dev
= kobj_to_dev(kobj
);
3521 struct regulator_dev
*rdev
= container_of(dev
, struct regulator_dev
, dev
);
3522 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3523 umode_t mode
= attr
->mode
;
3525 /* these three are always present */
3526 if (attr
== &dev_attr_name
.attr
||
3527 attr
== &dev_attr_num_users
.attr
||
3528 attr
== &dev_attr_type
.attr
)
3531 /* some attributes need specific methods to be displayed */
3532 if (attr
== &dev_attr_microvolts
.attr
) {
3533 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3534 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3535 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3536 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
3541 if (attr
== &dev_attr_microamps
.attr
)
3542 return ops
->get_current_limit
? mode
: 0;
3544 if (attr
== &dev_attr_opmode
.attr
)
3545 return ops
->get_mode
? mode
: 0;
3547 if (attr
== &dev_attr_state
.attr
)
3548 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
3550 if (attr
== &dev_attr_status
.attr
)
3551 return ops
->get_status
? mode
: 0;
3553 if (attr
== &dev_attr_bypass
.attr
)
3554 return ops
->get_bypass
? mode
: 0;
3556 /* some attributes are type-specific */
3557 if (attr
== &dev_attr_requested_microamps
.attr
)
3558 return rdev
->desc
->type
== REGULATOR_CURRENT
? mode
: 0;
3560 /* constraints need specific supporting methods */
3561 if (attr
== &dev_attr_min_microvolts
.attr
||
3562 attr
== &dev_attr_max_microvolts
.attr
)
3563 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
3565 if (attr
== &dev_attr_min_microamps
.attr
||
3566 attr
== &dev_attr_max_microamps
.attr
)
3567 return ops
->set_current_limit
? mode
: 0;
3569 if (attr
== &dev_attr_suspend_standby_state
.attr
||
3570 attr
== &dev_attr_suspend_mem_state
.attr
||
3571 attr
== &dev_attr_suspend_disk_state
.attr
)
3574 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
3575 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
3576 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
3577 return ops
->set_suspend_voltage
? mode
: 0;
3579 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
3580 attr
== &dev_attr_suspend_mem_mode
.attr
||
3581 attr
== &dev_attr_suspend_disk_mode
.attr
)
3582 return ops
->set_suspend_mode
? mode
: 0;
3587 static const struct attribute_group regulator_dev_group
= {
3588 .attrs
= regulator_dev_attrs
,
3589 .is_visible
= regulator_attr_is_visible
,
3592 static const struct attribute_group
*regulator_dev_groups
[] = {
3593 ®ulator_dev_group
,
3597 static void regulator_dev_release(struct device
*dev
)
3599 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
3603 static struct class regulator_class
= {
3604 .name
= "regulator",
3605 .dev_release
= regulator_dev_release
,
3606 .dev_groups
= regulator_dev_groups
,
3609 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3611 struct device
*parent
= rdev
->dev
.parent
;
3612 const char *rname
= rdev_get_name(rdev
);
3613 char name
[NAME_MAX
];
3615 /* Avoid duplicate debugfs directory names */
3616 if (parent
&& rname
== rdev
->desc
->name
) {
3617 snprintf(name
, sizeof(name
), "%s-%s", dev_name(parent
),
3622 rdev
->debugfs
= debugfs_create_dir(rname
, debugfs_root
);
3623 if (!rdev
->debugfs
) {
3624 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3628 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3630 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3632 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3633 &rdev
->bypass_count
);
3637 * regulator_register - register regulator
3638 * @regulator_desc: regulator to register
3639 * @cfg: runtime configuration for regulator
3641 * Called by regulator drivers to register a regulator.
3642 * Returns a valid pointer to struct regulator_dev on success
3643 * or an ERR_PTR() on error.
3645 struct regulator_dev
*
3646 regulator_register(const struct regulator_desc
*regulator_desc
,
3647 const struct regulator_config
*cfg
)
3649 const struct regulation_constraints
*constraints
= NULL
;
3650 const struct regulator_init_data
*init_data
;
3651 struct regulator_config
*config
= NULL
;
3652 static atomic_t regulator_no
= ATOMIC_INIT(-1);
3653 struct regulator_dev
*rdev
;
3657 if (regulator_desc
== NULL
|| cfg
== NULL
)
3658 return ERR_PTR(-EINVAL
);
3663 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3664 return ERR_PTR(-EINVAL
);
3666 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3667 regulator_desc
->type
!= REGULATOR_CURRENT
)
3668 return ERR_PTR(-EINVAL
);
3670 /* Only one of each should be implemented */
3671 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3672 regulator_desc
->ops
->get_voltage_sel
);
3673 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3674 regulator_desc
->ops
->set_voltage_sel
);
3676 /* If we're using selectors we must implement list_voltage. */
3677 if (regulator_desc
->ops
->get_voltage_sel
&&
3678 !regulator_desc
->ops
->list_voltage
) {
3679 return ERR_PTR(-EINVAL
);
3681 if (regulator_desc
->ops
->set_voltage_sel
&&
3682 !regulator_desc
->ops
->list_voltage
) {
3683 return ERR_PTR(-EINVAL
);
3686 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3688 return ERR_PTR(-ENOMEM
);
3691 * Duplicate the config so the driver could override it after
3692 * parsing init data.
3694 config
= kmemdup(cfg
, sizeof(*cfg
), GFP_KERNEL
);
3695 if (config
== NULL
) {
3697 return ERR_PTR(-ENOMEM
);
3700 init_data
= regulator_of_get_init_data(dev
, regulator_desc
, config
,
3701 &rdev
->dev
.of_node
);
3703 init_data
= config
->init_data
;
3704 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
3707 mutex_lock(®ulator_list_mutex
);
3709 mutex_init(&rdev
->mutex
);
3710 rdev
->reg_data
= config
->driver_data
;
3711 rdev
->owner
= regulator_desc
->owner
;
3712 rdev
->desc
= regulator_desc
;
3714 rdev
->regmap
= config
->regmap
;
3715 else if (dev_get_regmap(dev
, NULL
))
3716 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3717 else if (dev
->parent
)
3718 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3719 INIT_LIST_HEAD(&rdev
->consumer_list
);
3720 INIT_LIST_HEAD(&rdev
->list
);
3721 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3722 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3724 /* preform any regulator specific init */
3725 if (init_data
&& init_data
->regulator_init
) {
3726 ret
= init_data
->regulator_init(rdev
->reg_data
);
3731 /* register with sysfs */
3732 rdev
->dev
.class = ®ulator_class
;
3733 rdev
->dev
.parent
= dev
;
3734 dev_set_name(&rdev
->dev
, "regulator.%lu",
3735 (unsigned long) atomic_inc_return(®ulator_no
));
3736 ret
= device_register(&rdev
->dev
);
3738 put_device(&rdev
->dev
);
3742 dev_set_drvdata(&rdev
->dev
, rdev
);
3744 if ((config
->ena_gpio
|| config
->ena_gpio_initialized
) &&
3745 gpio_is_valid(config
->ena_gpio
)) {
3746 ret
= regulator_ena_gpio_request(rdev
, config
);
3748 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3749 config
->ena_gpio
, ret
);
3754 /* set regulator constraints */
3756 constraints
= &init_data
->constraints
;
3758 ret
= set_machine_constraints(rdev
, constraints
);
3762 if (init_data
&& init_data
->supply_regulator
)
3763 rdev
->supply_name
= init_data
->supply_regulator
;
3764 else if (regulator_desc
->supply_name
)
3765 rdev
->supply_name
= regulator_desc
->supply_name
;
3767 /* add consumers devices */
3769 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3770 ret
= set_consumer_device_supply(rdev
,
3771 init_data
->consumer_supplies
[i
].dev_name
,
3772 init_data
->consumer_supplies
[i
].supply
);
3774 dev_err(dev
, "Failed to set supply %s\n",
3775 init_data
->consumer_supplies
[i
].supply
);
3776 goto unset_supplies
;
3781 list_add(&rdev
->list
, ®ulator_list
);
3783 rdev_init_debugfs(rdev
);
3785 mutex_unlock(®ulator_list_mutex
);
3790 unset_regulator_supplies(rdev
);
3793 regulator_ena_gpio_free(rdev
);
3794 kfree(rdev
->constraints
);
3796 device_unregister(&rdev
->dev
);
3797 /* device core frees rdev */
3798 rdev
= ERR_PTR(ret
);
3803 rdev
= ERR_PTR(ret
);
3806 EXPORT_SYMBOL_GPL(regulator_register
);
3809 * regulator_unregister - unregister regulator
3810 * @rdev: regulator to unregister
3812 * Called by regulator drivers to unregister a regulator.
3814 void regulator_unregister(struct regulator_dev
*rdev
)
3820 while (rdev
->use_count
--)
3821 regulator_disable(rdev
->supply
);
3822 regulator_put(rdev
->supply
);
3824 mutex_lock(®ulator_list_mutex
);
3825 debugfs_remove_recursive(rdev
->debugfs
);
3826 flush_work(&rdev
->disable_work
.work
);
3827 WARN_ON(rdev
->open_count
);
3828 unset_regulator_supplies(rdev
);
3829 list_del(&rdev
->list
);
3830 mutex_unlock(®ulator_list_mutex
);
3831 kfree(rdev
->constraints
);
3832 regulator_ena_gpio_free(rdev
);
3833 of_node_put(rdev
->dev
.of_node
);
3834 device_unregister(&rdev
->dev
);
3836 EXPORT_SYMBOL_GPL(regulator_unregister
);
3839 * regulator_suspend_prepare - prepare regulators for system wide suspend
3840 * @state: system suspend state
3842 * Configure each regulator with it's suspend operating parameters for state.
3843 * This will usually be called by machine suspend code prior to supending.
3845 int regulator_suspend_prepare(suspend_state_t state
)
3847 struct regulator_dev
*rdev
;
3850 /* ON is handled by regulator active state */
3851 if (state
== PM_SUSPEND_ON
)
3854 mutex_lock(®ulator_list_mutex
);
3855 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3857 mutex_lock(&rdev
->mutex
);
3858 ret
= suspend_prepare(rdev
, state
);
3859 mutex_unlock(&rdev
->mutex
);
3862 rdev_err(rdev
, "failed to prepare\n");
3867 mutex_unlock(®ulator_list_mutex
);
3870 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3873 * regulator_suspend_finish - resume regulators from system wide suspend
3875 * Turn on regulators that might be turned off by regulator_suspend_prepare
3876 * and that should be turned on according to the regulators properties.
3878 int regulator_suspend_finish(void)
3880 struct regulator_dev
*rdev
;
3883 mutex_lock(®ulator_list_mutex
);
3884 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3885 mutex_lock(&rdev
->mutex
);
3886 if (rdev
->use_count
> 0 || rdev
->constraints
->always_on
) {
3887 if (!_regulator_is_enabled(rdev
)) {
3888 error
= _regulator_do_enable(rdev
);
3893 if (!have_full_constraints())
3895 if (!_regulator_is_enabled(rdev
))
3898 error
= _regulator_do_disable(rdev
);
3903 mutex_unlock(&rdev
->mutex
);
3905 mutex_unlock(®ulator_list_mutex
);
3908 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3911 * regulator_has_full_constraints - the system has fully specified constraints
3913 * Calling this function will cause the regulator API to disable all
3914 * regulators which have a zero use count and don't have an always_on
3915 * constraint in a late_initcall.
3917 * The intention is that this will become the default behaviour in a
3918 * future kernel release so users are encouraged to use this facility
3921 void regulator_has_full_constraints(void)
3923 has_full_constraints
= 1;
3925 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3928 * rdev_get_drvdata - get rdev regulator driver data
3931 * Get rdev regulator driver private data. This call can be used in the
3932 * regulator driver context.
3934 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3936 return rdev
->reg_data
;
3938 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3941 * regulator_get_drvdata - get regulator driver data
3942 * @regulator: regulator
3944 * Get regulator driver private data. This call can be used in the consumer
3945 * driver context when non API regulator specific functions need to be called.
3947 void *regulator_get_drvdata(struct regulator
*regulator
)
3949 return regulator
->rdev
->reg_data
;
3951 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3954 * regulator_set_drvdata - set regulator driver data
3955 * @regulator: regulator
3958 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3960 regulator
->rdev
->reg_data
= data
;
3962 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3965 * regulator_get_id - get regulator ID
3968 int rdev_get_id(struct regulator_dev
*rdev
)
3970 return rdev
->desc
->id
;
3972 EXPORT_SYMBOL_GPL(rdev_get_id
);
3974 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3978 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3980 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3982 return reg_init_data
->driver_data
;
3984 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3986 #ifdef CONFIG_DEBUG_FS
3987 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3988 size_t count
, loff_t
*ppos
)
3990 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3991 ssize_t len
, ret
= 0;
3992 struct regulator_map
*map
;
3997 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3998 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
4000 rdev_get_name(map
->regulator
), map
->dev_name
,
4004 if (ret
> PAGE_SIZE
) {
4010 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
4018 static const struct file_operations supply_map_fops
= {
4019 #ifdef CONFIG_DEBUG_FS
4020 .read
= supply_map_read_file
,
4021 .llseek
= default_llseek
,
4025 #ifdef CONFIG_DEBUG_FS
4026 static void regulator_summary_show_subtree(struct seq_file
*s
,
4027 struct regulator_dev
*rdev
,
4030 struct list_head
*list
= s
->private;
4031 struct regulator_dev
*child
;
4032 struct regulation_constraints
*c
;
4033 struct regulator
*consumer
;
4038 seq_printf(s
, "%*s%-*s %3d %4d %6d ",
4040 30 - level
* 3, rdev_get_name(rdev
),
4041 rdev
->use_count
, rdev
->open_count
, rdev
->bypass_count
);
4043 seq_printf(s
, "%5dmV ", _regulator_get_voltage(rdev
) / 1000);
4044 seq_printf(s
, "%5dmA ", _regulator_get_current_limit(rdev
) / 1000);
4046 c
= rdev
->constraints
;
4048 switch (rdev
->desc
->type
) {
4049 case REGULATOR_VOLTAGE
:
4050 seq_printf(s
, "%5dmV %5dmV ",
4051 c
->min_uV
/ 1000, c
->max_uV
/ 1000);
4053 case REGULATOR_CURRENT
:
4054 seq_printf(s
, "%5dmA %5dmA ",
4055 c
->min_uA
/ 1000, c
->max_uA
/ 1000);
4062 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
) {
4063 if (consumer
->dev
->class == ®ulator_class
)
4066 seq_printf(s
, "%*s%-*s ",
4067 (level
+ 1) * 3 + 1, "",
4068 30 - (level
+ 1) * 3, dev_name(consumer
->dev
));
4070 switch (rdev
->desc
->type
) {
4071 case REGULATOR_VOLTAGE
:
4072 seq_printf(s
, "%37dmV %5dmV",
4073 consumer
->min_uV
/ 1000,
4074 consumer
->max_uV
/ 1000);
4076 case REGULATOR_CURRENT
:
4083 list_for_each_entry(child
, list
, list
) {
4084 /* handle only non-root regulators supplied by current rdev */
4085 if (!child
->supply
|| child
->supply
->rdev
!= rdev
)
4088 regulator_summary_show_subtree(s
, child
, level
+ 1);
4092 static int regulator_summary_show(struct seq_file
*s
, void *data
)
4094 struct list_head
*list
= s
->private;
4095 struct regulator_dev
*rdev
;
4097 seq_puts(s
, " regulator use open bypass voltage current min max\n");
4098 seq_puts(s
, "-------------------------------------------------------------------------------\n");
4100 mutex_lock(®ulator_list_mutex
);
4102 list_for_each_entry(rdev
, list
, list
) {
4106 regulator_summary_show_subtree(s
, rdev
, 0);
4109 mutex_unlock(®ulator_list_mutex
);
4114 static int regulator_summary_open(struct inode
*inode
, struct file
*file
)
4116 return single_open(file
, regulator_summary_show
, inode
->i_private
);
4120 static const struct file_operations regulator_summary_fops
= {
4121 #ifdef CONFIG_DEBUG_FS
4122 .open
= regulator_summary_open
,
4124 .llseek
= seq_lseek
,
4125 .release
= single_release
,
4129 static int __init
regulator_init(void)
4133 ret
= class_register(®ulator_class
);
4135 debugfs_root
= debugfs_create_dir("regulator", NULL
);
4137 pr_warn("regulator: Failed to create debugfs directory\n");
4139 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
4142 debugfs_create_file("regulator_summary", 0444, debugfs_root
,
4143 ®ulator_list
, ®ulator_summary_fops
);
4145 regulator_dummy_init();
4150 /* init early to allow our consumers to complete system booting */
4151 core_initcall(regulator_init
);
4153 static int __init
regulator_init_complete(void)
4155 struct regulator_dev
*rdev
;
4156 const struct regulator_ops
*ops
;
4157 struct regulation_constraints
*c
;
4161 * Since DT doesn't provide an idiomatic mechanism for
4162 * enabling full constraints and since it's much more natural
4163 * with DT to provide them just assume that a DT enabled
4164 * system has full constraints.
4166 if (of_have_populated_dt())
4167 has_full_constraints
= true;
4169 mutex_lock(®ulator_list_mutex
);
4171 /* If we have a full configuration then disable any regulators
4172 * we have permission to change the status for and which are
4173 * not in use or always_on. This is effectively the default
4174 * for DT and ACPI as they have full constraints.
4176 list_for_each_entry(rdev
, ®ulator_list
, list
) {
4177 ops
= rdev
->desc
->ops
;
4178 c
= rdev
->constraints
;
4180 if (c
&& c
->always_on
)
4183 if (c
&& !(c
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
))
4186 mutex_lock(&rdev
->mutex
);
4188 if (rdev
->use_count
)
4191 /* If we can't read the status assume it's on. */
4192 if (ops
->is_enabled
)
4193 enabled
= ops
->is_enabled(rdev
);
4200 if (have_full_constraints()) {
4201 /* We log since this may kill the system if it
4203 rdev_info(rdev
, "disabling\n");
4204 ret
= _regulator_do_disable(rdev
);
4206 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4208 /* The intention is that in future we will
4209 * assume that full constraints are provided
4210 * so warn even if we aren't going to do
4213 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4217 mutex_unlock(&rdev
->mutex
);
4220 mutex_unlock(®ulator_list_mutex
);
4224 late_initcall_sync(regulator_init_complete
);