2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
27 #include <linux/gpio/consumer.h>
29 #include <linux/regmap.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/module.h>
36 #define CREATE_TRACE_POINTS
37 #include <trace/events/regulator.h>
42 #define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 #define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
53 static DEFINE_MUTEX(regulator_list_mutex
);
54 static LIST_HEAD(regulator_map_list
);
55 static LIST_HEAD(regulator_ena_gpio_list
);
56 static LIST_HEAD(regulator_supply_alias_list
);
57 static bool has_full_constraints
;
59 static struct dentry
*debugfs_root
;
61 static struct class regulator_class
;
64 * struct regulator_map
66 * Used to provide symbolic supply names to devices.
68 struct regulator_map
{
69 struct list_head list
;
70 const char *dev_name
; /* The dev_name() for the consumer */
72 struct regulator_dev
*regulator
;
76 * struct regulator_enable_gpio
78 * Management for shared enable GPIO pin
80 struct regulator_enable_gpio
{
81 struct list_head list
;
82 struct gpio_desc
*gpiod
;
83 u32 enable_count
; /* a number of enabled shared GPIO */
84 u32 request_count
; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert
:1;
89 * struct regulator_supply_alias
91 * Used to map lookups for a supply onto an alternative device.
93 struct regulator_supply_alias
{
94 struct list_head list
;
95 struct device
*src_dev
;
96 const char *src_supply
;
97 struct device
*alias_dev
;
98 const char *alias_supply
;
101 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
102 static int _regulator_disable(struct regulator_dev
*rdev
);
103 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
104 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
105 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
106 static int _notifier_call_chain(struct regulator_dev
*rdev
,
107 unsigned long event
, void *data
);
108 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
109 int min_uV
, int max_uV
);
110 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
112 const char *supply_name
);
113 static void _regulator_put(struct regulator
*regulator
);
115 static struct regulator_dev
*dev_to_rdev(struct device
*dev
)
117 return container_of(dev
, struct regulator_dev
, dev
);
120 static const char *rdev_get_name(struct regulator_dev
*rdev
)
122 if (rdev
->constraints
&& rdev
->constraints
->name
)
123 return rdev
->constraints
->name
;
124 else if (rdev
->desc
->name
)
125 return rdev
->desc
->name
;
130 static bool have_full_constraints(void)
132 return has_full_constraints
|| of_have_populated_dt();
136 * of_get_regulator - get a regulator device node based on supply name
137 * @dev: Device pointer for the consumer (of regulator) device
138 * @supply: regulator supply name
140 * Extract the regulator device node corresponding to the supply name.
141 * returns the device node corresponding to the regulator if found, else
144 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
146 struct device_node
*regnode
= NULL
;
147 char prop_name
[32]; /* 32 is max size of property name */
149 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
151 snprintf(prop_name
, 32, "%s-supply", supply
);
152 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
155 dev_dbg(dev
, "Looking up %s property in node %s failed",
156 prop_name
, dev
->of_node
->full_name
);
162 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
164 if (!rdev
->constraints
)
167 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
173 /* Platform voltage constraint check */
174 static int regulator_check_voltage(struct regulator_dev
*rdev
,
175 int *min_uV
, int *max_uV
)
177 BUG_ON(*min_uV
> *max_uV
);
179 if (!rdev
->constraints
) {
180 rdev_err(rdev
, "no constraints\n");
183 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
184 rdev_err(rdev
, "voltage operation not allowed\n");
188 if (*max_uV
> rdev
->constraints
->max_uV
)
189 *max_uV
= rdev
->constraints
->max_uV
;
190 if (*min_uV
< rdev
->constraints
->min_uV
)
191 *min_uV
= rdev
->constraints
->min_uV
;
193 if (*min_uV
> *max_uV
) {
194 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
202 /* Make sure we select a voltage that suits the needs of all
203 * regulator consumers
205 static int regulator_check_consumers(struct regulator_dev
*rdev
,
206 int *min_uV
, int *max_uV
)
208 struct regulator
*regulator
;
210 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
212 * Assume consumers that didn't say anything are OK
213 * with anything in the constraint range.
215 if (!regulator
->min_uV
&& !regulator
->max_uV
)
218 if (*max_uV
> regulator
->max_uV
)
219 *max_uV
= regulator
->max_uV
;
220 if (*min_uV
< regulator
->min_uV
)
221 *min_uV
= regulator
->min_uV
;
224 if (*min_uV
> *max_uV
) {
225 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
233 /* current constraint check */
234 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
235 int *min_uA
, int *max_uA
)
237 BUG_ON(*min_uA
> *max_uA
);
239 if (!rdev
->constraints
) {
240 rdev_err(rdev
, "no constraints\n");
243 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
244 rdev_err(rdev
, "current operation not allowed\n");
248 if (*max_uA
> rdev
->constraints
->max_uA
)
249 *max_uA
= rdev
->constraints
->max_uA
;
250 if (*min_uA
< rdev
->constraints
->min_uA
)
251 *min_uA
= rdev
->constraints
->min_uA
;
253 if (*min_uA
> *max_uA
) {
254 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
262 /* operating mode constraint check */
263 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
266 case REGULATOR_MODE_FAST
:
267 case REGULATOR_MODE_NORMAL
:
268 case REGULATOR_MODE_IDLE
:
269 case REGULATOR_MODE_STANDBY
:
272 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
276 if (!rdev
->constraints
) {
277 rdev_err(rdev
, "no constraints\n");
280 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
281 rdev_err(rdev
, "mode operation not allowed\n");
285 /* The modes are bitmasks, the most power hungry modes having
286 * the lowest values. If the requested mode isn't supported
287 * try higher modes. */
289 if (rdev
->constraints
->valid_modes_mask
& *mode
)
297 /* dynamic regulator mode switching constraint check */
298 static int regulator_check_drms(struct regulator_dev
*rdev
)
300 if (!rdev
->constraints
) {
301 rdev_err(rdev
, "no constraints\n");
304 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
305 rdev_dbg(rdev
, "drms operation not allowed\n");
311 static ssize_t
regulator_uV_show(struct device
*dev
,
312 struct device_attribute
*attr
, char *buf
)
314 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
317 mutex_lock(&rdev
->mutex
);
318 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
319 mutex_unlock(&rdev
->mutex
);
323 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
325 static ssize_t
regulator_uA_show(struct device
*dev
,
326 struct device_attribute
*attr
, char *buf
)
328 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
330 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
332 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
334 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
337 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
339 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
341 static DEVICE_ATTR_RO(name
);
343 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
346 case REGULATOR_MODE_FAST
:
347 return sprintf(buf
, "fast\n");
348 case REGULATOR_MODE_NORMAL
:
349 return sprintf(buf
, "normal\n");
350 case REGULATOR_MODE_IDLE
:
351 return sprintf(buf
, "idle\n");
352 case REGULATOR_MODE_STANDBY
:
353 return sprintf(buf
, "standby\n");
355 return sprintf(buf
, "unknown\n");
358 static ssize_t
regulator_opmode_show(struct device
*dev
,
359 struct device_attribute
*attr
, char *buf
)
361 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
363 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
365 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
367 static ssize_t
regulator_print_state(char *buf
, int state
)
370 return sprintf(buf
, "enabled\n");
372 return sprintf(buf
, "disabled\n");
374 return sprintf(buf
, "unknown\n");
377 static ssize_t
regulator_state_show(struct device
*dev
,
378 struct device_attribute
*attr
, char *buf
)
380 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
383 mutex_lock(&rdev
->mutex
);
384 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
385 mutex_unlock(&rdev
->mutex
);
389 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
391 static ssize_t
regulator_status_show(struct device
*dev
,
392 struct device_attribute
*attr
, char *buf
)
394 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
398 status
= rdev
->desc
->ops
->get_status(rdev
);
403 case REGULATOR_STATUS_OFF
:
406 case REGULATOR_STATUS_ON
:
409 case REGULATOR_STATUS_ERROR
:
412 case REGULATOR_STATUS_FAST
:
415 case REGULATOR_STATUS_NORMAL
:
418 case REGULATOR_STATUS_IDLE
:
421 case REGULATOR_STATUS_STANDBY
:
424 case REGULATOR_STATUS_BYPASS
:
427 case REGULATOR_STATUS_UNDEFINED
:
434 return sprintf(buf
, "%s\n", label
);
436 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
438 static ssize_t
regulator_min_uA_show(struct device
*dev
,
439 struct device_attribute
*attr
, char *buf
)
441 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
443 if (!rdev
->constraints
)
444 return sprintf(buf
, "constraint not defined\n");
446 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
448 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
450 static ssize_t
regulator_max_uA_show(struct device
*dev
,
451 struct device_attribute
*attr
, char *buf
)
453 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
455 if (!rdev
->constraints
)
456 return sprintf(buf
, "constraint not defined\n");
458 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
460 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
462 static ssize_t
regulator_min_uV_show(struct device
*dev
,
463 struct device_attribute
*attr
, char *buf
)
465 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
467 if (!rdev
->constraints
)
468 return sprintf(buf
, "constraint not defined\n");
470 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
472 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
474 static ssize_t
regulator_max_uV_show(struct device
*dev
,
475 struct device_attribute
*attr
, char *buf
)
477 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
479 if (!rdev
->constraints
)
480 return sprintf(buf
, "constraint not defined\n");
482 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
484 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
486 static ssize_t
regulator_total_uA_show(struct device
*dev
,
487 struct device_attribute
*attr
, char *buf
)
489 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
490 struct regulator
*regulator
;
493 mutex_lock(&rdev
->mutex
);
494 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
495 uA
+= regulator
->uA_load
;
496 mutex_unlock(&rdev
->mutex
);
497 return sprintf(buf
, "%d\n", uA
);
499 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
501 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
504 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
505 return sprintf(buf
, "%d\n", rdev
->use_count
);
507 static DEVICE_ATTR_RO(num_users
);
509 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
512 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
514 switch (rdev
->desc
->type
) {
515 case REGULATOR_VOLTAGE
:
516 return sprintf(buf
, "voltage\n");
517 case REGULATOR_CURRENT
:
518 return sprintf(buf
, "current\n");
520 return sprintf(buf
, "unknown\n");
522 static DEVICE_ATTR_RO(type
);
524 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
525 struct device_attribute
*attr
, char *buf
)
527 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
529 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
531 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
532 regulator_suspend_mem_uV_show
, NULL
);
534 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
535 struct device_attribute
*attr
, char *buf
)
537 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
539 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
541 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
542 regulator_suspend_disk_uV_show
, NULL
);
544 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
545 struct device_attribute
*attr
, char *buf
)
547 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
549 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
551 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
552 regulator_suspend_standby_uV_show
, NULL
);
554 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
555 struct device_attribute
*attr
, char *buf
)
557 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
559 return regulator_print_opmode(buf
,
560 rdev
->constraints
->state_mem
.mode
);
562 static DEVICE_ATTR(suspend_mem_mode
, 0444,
563 regulator_suspend_mem_mode_show
, NULL
);
565 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
566 struct device_attribute
*attr
, char *buf
)
568 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
570 return regulator_print_opmode(buf
,
571 rdev
->constraints
->state_disk
.mode
);
573 static DEVICE_ATTR(suspend_disk_mode
, 0444,
574 regulator_suspend_disk_mode_show
, NULL
);
576 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
577 struct device_attribute
*attr
, char *buf
)
579 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
581 return regulator_print_opmode(buf
,
582 rdev
->constraints
->state_standby
.mode
);
584 static DEVICE_ATTR(suspend_standby_mode
, 0444,
585 regulator_suspend_standby_mode_show
, NULL
);
587 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
588 struct device_attribute
*attr
, char *buf
)
590 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
592 return regulator_print_state(buf
,
593 rdev
->constraints
->state_mem
.enabled
);
595 static DEVICE_ATTR(suspend_mem_state
, 0444,
596 regulator_suspend_mem_state_show
, NULL
);
598 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
599 struct device_attribute
*attr
, char *buf
)
601 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
603 return regulator_print_state(buf
,
604 rdev
->constraints
->state_disk
.enabled
);
606 static DEVICE_ATTR(suspend_disk_state
, 0444,
607 regulator_suspend_disk_state_show
, NULL
);
609 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
610 struct device_attribute
*attr
, char *buf
)
612 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
614 return regulator_print_state(buf
,
615 rdev
->constraints
->state_standby
.enabled
);
617 static DEVICE_ATTR(suspend_standby_state
, 0444,
618 regulator_suspend_standby_state_show
, NULL
);
620 static ssize_t
regulator_bypass_show(struct device
*dev
,
621 struct device_attribute
*attr
, char *buf
)
623 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
628 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
637 return sprintf(buf
, "%s\n", report
);
639 static DEVICE_ATTR(bypass
, 0444,
640 regulator_bypass_show
, NULL
);
642 /* Calculate the new optimum regulator operating mode based on the new total
643 * consumer load. All locks held by caller */
644 static int drms_uA_update(struct regulator_dev
*rdev
)
646 struct regulator
*sibling
;
647 int current_uA
= 0, output_uV
, input_uV
, err
;
650 lockdep_assert_held_once(&rdev
->mutex
);
653 * first check to see if we can set modes at all, otherwise just
654 * tell the consumer everything is OK.
656 err
= regulator_check_drms(rdev
);
660 if (!rdev
->desc
->ops
->get_optimum_mode
&&
661 !rdev
->desc
->ops
->set_load
)
664 if (!rdev
->desc
->ops
->set_mode
&&
665 !rdev
->desc
->ops
->set_load
)
668 /* get output voltage */
669 output_uV
= _regulator_get_voltage(rdev
);
670 if (output_uV
<= 0) {
671 rdev_err(rdev
, "invalid output voltage found\n");
675 /* get input voltage */
678 input_uV
= regulator_get_voltage(rdev
->supply
);
680 input_uV
= rdev
->constraints
->input_uV
;
682 rdev_err(rdev
, "invalid input voltage found\n");
686 /* calc total requested load */
687 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
688 current_uA
+= sibling
->uA_load
;
690 current_uA
+= rdev
->constraints
->system_load
;
692 if (rdev
->desc
->ops
->set_load
) {
693 /* set the optimum mode for our new total regulator load */
694 err
= rdev
->desc
->ops
->set_load(rdev
, current_uA
);
696 rdev_err(rdev
, "failed to set load %d\n", current_uA
);
698 /* now get the optimum mode for our new total regulator load */
699 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
700 output_uV
, current_uA
);
702 /* check the new mode is allowed */
703 err
= regulator_mode_constrain(rdev
, &mode
);
705 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
706 current_uA
, input_uV
, output_uV
);
710 err
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
712 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
718 static int suspend_set_state(struct regulator_dev
*rdev
,
719 struct regulator_state
*rstate
)
723 /* If we have no suspend mode configration don't set anything;
724 * only warn if the driver implements set_suspend_voltage or
725 * set_suspend_mode callback.
727 if (!rstate
->enabled
&& !rstate
->disabled
) {
728 if (rdev
->desc
->ops
->set_suspend_voltage
||
729 rdev
->desc
->ops
->set_suspend_mode
)
730 rdev_warn(rdev
, "No configuration\n");
734 if (rstate
->enabled
&& rstate
->disabled
) {
735 rdev_err(rdev
, "invalid configuration\n");
739 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
740 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
741 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
742 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
743 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
747 rdev_err(rdev
, "failed to enabled/disable\n");
751 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
752 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
754 rdev_err(rdev
, "failed to set voltage\n");
759 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
760 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
762 rdev_err(rdev
, "failed to set mode\n");
769 /* locks held by caller */
770 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
772 lockdep_assert_held_once(&rdev
->mutex
);
774 if (!rdev
->constraints
)
778 case PM_SUSPEND_STANDBY
:
779 return suspend_set_state(rdev
,
780 &rdev
->constraints
->state_standby
);
782 return suspend_set_state(rdev
,
783 &rdev
->constraints
->state_mem
);
785 return suspend_set_state(rdev
,
786 &rdev
->constraints
->state_disk
);
792 static void print_constraints(struct regulator_dev
*rdev
)
794 struct regulation_constraints
*constraints
= rdev
->constraints
;
796 size_t len
= sizeof(buf
) - 1;
800 if (constraints
->min_uV
&& constraints
->max_uV
) {
801 if (constraints
->min_uV
== constraints
->max_uV
)
802 count
+= scnprintf(buf
+ count
, len
- count
, "%d mV ",
803 constraints
->min_uV
/ 1000);
805 count
+= scnprintf(buf
+ count
, len
- count
,
807 constraints
->min_uV
/ 1000,
808 constraints
->max_uV
/ 1000);
811 if (!constraints
->min_uV
||
812 constraints
->min_uV
!= constraints
->max_uV
) {
813 ret
= _regulator_get_voltage(rdev
);
815 count
+= scnprintf(buf
+ count
, len
- count
,
816 "at %d mV ", ret
/ 1000);
819 if (constraints
->uV_offset
)
820 count
+= scnprintf(buf
+ count
, len
- count
, "%dmV offset ",
821 constraints
->uV_offset
/ 1000);
823 if (constraints
->min_uA
&& constraints
->max_uA
) {
824 if (constraints
->min_uA
== constraints
->max_uA
)
825 count
+= scnprintf(buf
+ count
, len
- count
, "%d mA ",
826 constraints
->min_uA
/ 1000);
828 count
+= scnprintf(buf
+ count
, len
- count
,
830 constraints
->min_uA
/ 1000,
831 constraints
->max_uA
/ 1000);
834 if (!constraints
->min_uA
||
835 constraints
->min_uA
!= constraints
->max_uA
) {
836 ret
= _regulator_get_current_limit(rdev
);
838 count
+= scnprintf(buf
+ count
, len
- count
,
839 "at %d mA ", ret
/ 1000);
842 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
843 count
+= scnprintf(buf
+ count
, len
- count
, "fast ");
844 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
845 count
+= scnprintf(buf
+ count
, len
- count
, "normal ");
846 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
847 count
+= scnprintf(buf
+ count
, len
- count
, "idle ");
848 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
849 count
+= scnprintf(buf
+ count
, len
- count
, "standby");
852 scnprintf(buf
, len
, "no parameters");
854 rdev_dbg(rdev
, "%s\n", buf
);
856 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
857 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
859 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
862 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
863 struct regulation_constraints
*constraints
)
865 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
868 /* do we need to apply the constraint voltage */
869 if (rdev
->constraints
->apply_uV
&&
870 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
871 int current_uV
= _regulator_get_voltage(rdev
);
872 if (current_uV
< 0) {
874 "failed to get the current voltage(%d)\n",
878 if (current_uV
< rdev
->constraints
->min_uV
||
879 current_uV
> rdev
->constraints
->max_uV
) {
880 ret
= _regulator_do_set_voltage(
881 rdev
, rdev
->constraints
->min_uV
,
882 rdev
->constraints
->max_uV
);
885 "failed to apply %duV constraint(%d)\n",
886 rdev
->constraints
->min_uV
, ret
);
892 /* constrain machine-level voltage specs to fit
893 * the actual range supported by this regulator.
895 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
896 int count
= rdev
->desc
->n_voltages
;
898 int min_uV
= INT_MAX
;
899 int max_uV
= INT_MIN
;
900 int cmin
= constraints
->min_uV
;
901 int cmax
= constraints
->max_uV
;
903 /* it's safe to autoconfigure fixed-voltage supplies
904 and the constraints are used by list_voltage. */
905 if (count
== 1 && !cmin
) {
908 constraints
->min_uV
= cmin
;
909 constraints
->max_uV
= cmax
;
912 /* voltage constraints are optional */
913 if ((cmin
== 0) && (cmax
== 0))
916 /* else require explicit machine-level constraints */
917 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
918 rdev_err(rdev
, "invalid voltage constraints\n");
922 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
923 for (i
= 0; i
< count
; i
++) {
926 value
= ops
->list_voltage(rdev
, i
);
930 /* maybe adjust [min_uV..max_uV] */
931 if (value
>= cmin
&& value
< min_uV
)
933 if (value
<= cmax
&& value
> max_uV
)
937 /* final: [min_uV..max_uV] valid iff constraints valid */
938 if (max_uV
< min_uV
) {
940 "unsupportable voltage constraints %u-%uuV\n",
945 /* use regulator's subset of machine constraints */
946 if (constraints
->min_uV
< min_uV
) {
947 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
948 constraints
->min_uV
, min_uV
);
949 constraints
->min_uV
= min_uV
;
951 if (constraints
->max_uV
> max_uV
) {
952 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
953 constraints
->max_uV
, max_uV
);
954 constraints
->max_uV
= max_uV
;
961 static int machine_constraints_current(struct regulator_dev
*rdev
,
962 struct regulation_constraints
*constraints
)
964 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
967 if (!constraints
->min_uA
&& !constraints
->max_uA
)
970 if (constraints
->min_uA
> constraints
->max_uA
) {
971 rdev_err(rdev
, "Invalid current constraints\n");
975 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
976 rdev_warn(rdev
, "Operation of current configuration missing\n");
980 /* Set regulator current in constraints range */
981 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
982 constraints
->max_uA
);
984 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
991 static int _regulator_do_enable(struct regulator_dev
*rdev
);
994 * set_machine_constraints - sets regulator constraints
995 * @rdev: regulator source
996 * @constraints: constraints to apply
998 * Allows platform initialisation code to define and constrain
999 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1000 * Constraints *must* be set by platform code in order for some
1001 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1004 static int set_machine_constraints(struct regulator_dev
*rdev
,
1005 const struct regulation_constraints
*constraints
)
1008 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1011 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
1014 rdev
->constraints
= kzalloc(sizeof(*constraints
),
1016 if (!rdev
->constraints
)
1019 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
1023 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
1027 if (rdev
->constraints
->ilim_uA
&& ops
->set_input_current_limit
) {
1028 ret
= ops
->set_input_current_limit(rdev
,
1029 rdev
->constraints
->ilim_uA
);
1031 rdev_err(rdev
, "failed to set input limit\n");
1036 /* do we need to setup our suspend state */
1037 if (rdev
->constraints
->initial_state
) {
1038 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
1040 rdev_err(rdev
, "failed to set suspend state\n");
1045 if (rdev
->constraints
->initial_mode
) {
1046 if (!ops
->set_mode
) {
1047 rdev_err(rdev
, "no set_mode operation\n");
1052 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1054 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1059 /* If the constraints say the regulator should be on at this point
1060 * and we have control then make sure it is enabled.
1062 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
1063 ret
= _regulator_do_enable(rdev
);
1064 if (ret
< 0 && ret
!= -EINVAL
) {
1065 rdev_err(rdev
, "failed to enable\n");
1070 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1071 && ops
->set_ramp_delay
) {
1072 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1074 rdev_err(rdev
, "failed to set ramp_delay\n");
1079 if (rdev
->constraints
->pull_down
&& ops
->set_pull_down
) {
1080 ret
= ops
->set_pull_down(rdev
);
1082 rdev_err(rdev
, "failed to set pull down\n");
1087 if (rdev
->constraints
->soft_start
&& ops
->set_soft_start
) {
1088 ret
= ops
->set_soft_start(rdev
);
1090 rdev_err(rdev
, "failed to set soft start\n");
1095 if (rdev
->constraints
->over_current_protection
1096 && ops
->set_over_current_protection
) {
1097 ret
= ops
->set_over_current_protection(rdev
);
1099 rdev_err(rdev
, "failed to set over current protection\n");
1104 print_constraints(rdev
);
1107 kfree(rdev
->constraints
);
1108 rdev
->constraints
= NULL
;
1113 * set_supply - set regulator supply regulator
1114 * @rdev: regulator name
1115 * @supply_rdev: supply regulator name
1117 * Called by platform initialisation code to set the supply regulator for this
1118 * regulator. This ensures that a regulators supply will also be enabled by the
1119 * core if it's child is enabled.
1121 static int set_supply(struct regulator_dev
*rdev
,
1122 struct regulator_dev
*supply_rdev
)
1126 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1128 if (!try_module_get(supply_rdev
->owner
))
1131 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1132 if (rdev
->supply
== NULL
) {
1136 supply_rdev
->open_count
++;
1142 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1143 * @rdev: regulator source
1144 * @consumer_dev_name: dev_name() string for device supply applies to
1145 * @supply: symbolic name for supply
1147 * Allows platform initialisation code to map physical regulator
1148 * sources to symbolic names for supplies for use by devices. Devices
1149 * should use these symbolic names to request regulators, avoiding the
1150 * need to provide board-specific regulator names as platform data.
1152 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1153 const char *consumer_dev_name
,
1156 struct regulator_map
*node
;
1162 if (consumer_dev_name
!= NULL
)
1167 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1168 if (node
->dev_name
&& consumer_dev_name
) {
1169 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1171 } else if (node
->dev_name
|| consumer_dev_name
) {
1175 if (strcmp(node
->supply
, supply
) != 0)
1178 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1180 dev_name(&node
->regulator
->dev
),
1181 node
->regulator
->desc
->name
,
1183 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1187 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1191 node
->regulator
= rdev
;
1192 node
->supply
= supply
;
1195 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1196 if (node
->dev_name
== NULL
) {
1202 list_add(&node
->list
, ®ulator_map_list
);
1206 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1208 struct regulator_map
*node
, *n
;
1210 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1211 if (rdev
== node
->regulator
) {
1212 list_del(&node
->list
);
1213 kfree(node
->dev_name
);
1219 #define REG_STR_SIZE 64
1221 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1223 const char *supply_name
)
1225 struct regulator
*regulator
;
1226 char buf
[REG_STR_SIZE
];
1229 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1230 if (regulator
== NULL
)
1233 mutex_lock(&rdev
->mutex
);
1234 regulator
->rdev
= rdev
;
1235 list_add(®ulator
->list
, &rdev
->consumer_list
);
1238 regulator
->dev
= dev
;
1240 /* Add a link to the device sysfs entry */
1241 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1242 dev
->kobj
.name
, supply_name
);
1243 if (size
>= REG_STR_SIZE
)
1246 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1247 if (regulator
->supply_name
== NULL
)
1250 err
= sysfs_create_link_nowarn(&rdev
->dev
.kobj
, &dev
->kobj
,
1253 rdev_dbg(rdev
, "could not add device link %s err %d\n",
1254 dev
->kobj
.name
, err
);
1258 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1259 if (regulator
->supply_name
== NULL
)
1263 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1265 if (!regulator
->debugfs
) {
1266 rdev_dbg(rdev
, "Failed to create debugfs directory\n");
1268 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1269 ®ulator
->uA_load
);
1270 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1271 ®ulator
->min_uV
);
1272 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1273 ®ulator
->max_uV
);
1277 * Check now if the regulator is an always on regulator - if
1278 * it is then we don't need to do nearly so much work for
1279 * enable/disable calls.
1281 if (!_regulator_can_change_status(rdev
) &&
1282 _regulator_is_enabled(rdev
))
1283 regulator
->always_on
= true;
1285 mutex_unlock(&rdev
->mutex
);
1288 list_del(®ulator
->list
);
1290 mutex_unlock(&rdev
->mutex
);
1294 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1296 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1297 return rdev
->constraints
->enable_time
;
1298 if (!rdev
->desc
->ops
->enable_time
)
1299 return rdev
->desc
->enable_time
;
1300 return rdev
->desc
->ops
->enable_time(rdev
);
1303 static struct regulator_supply_alias
*regulator_find_supply_alias(
1304 struct device
*dev
, const char *supply
)
1306 struct regulator_supply_alias
*map
;
1308 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1309 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1315 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1317 struct regulator_supply_alias
*map
;
1319 map
= regulator_find_supply_alias(*dev
, *supply
);
1321 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1322 *supply
, map
->alias_supply
,
1323 dev_name(map
->alias_dev
));
1324 *dev
= map
->alias_dev
;
1325 *supply
= map
->alias_supply
;
1329 static int of_node_match(struct device
*dev
, const void *data
)
1331 return dev
->of_node
== data
;
1334 static struct regulator_dev
*of_find_regulator_by_node(struct device_node
*np
)
1338 dev
= class_find_device(®ulator_class
, NULL
, np
, of_node_match
);
1340 return dev
? dev_to_rdev(dev
) : NULL
;
1343 static int regulator_match(struct device
*dev
, const void *data
)
1345 struct regulator_dev
*r
= dev_to_rdev(dev
);
1347 return strcmp(rdev_get_name(r
), data
) == 0;
1350 static struct regulator_dev
*regulator_lookup_by_name(const char *name
)
1354 dev
= class_find_device(®ulator_class
, NULL
, name
, regulator_match
);
1356 return dev
? dev_to_rdev(dev
) : NULL
;
1360 * regulator_dev_lookup - lookup a regulator device.
1361 * @dev: device for regulator "consumer".
1362 * @supply: Supply name or regulator ID.
1363 * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if
1364 * lookup could succeed in the future.
1366 * If successful, returns a struct regulator_dev that corresponds to the name
1367 * @supply and with the embedded struct device refcount incremented by one,
1368 * or NULL on failure. The refcount must be dropped by calling put_device().
1370 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1374 struct regulator_dev
*r
;
1375 struct device_node
*node
;
1376 struct regulator_map
*map
;
1377 const char *devname
= NULL
;
1379 regulator_supply_alias(&dev
, &supply
);
1381 /* first do a dt based lookup */
1382 if (dev
&& dev
->of_node
) {
1383 node
= of_get_regulator(dev
, supply
);
1385 r
= of_find_regulator_by_node(node
);
1388 *ret
= -EPROBE_DEFER
;
1392 * If we couldn't even get the node then it's
1393 * not just that the device didn't register
1394 * yet, there's no node and we'll never
1401 /* if not found, try doing it non-dt way */
1403 devname
= dev_name(dev
);
1405 r
= regulator_lookup_by_name(supply
);
1409 mutex_lock(®ulator_list_mutex
);
1410 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1411 /* If the mapping has a device set up it must match */
1412 if (map
->dev_name
&&
1413 (!devname
|| strcmp(map
->dev_name
, devname
)))
1416 if (strcmp(map
->supply
, supply
) == 0 &&
1417 get_device(&map
->regulator
->dev
)) {
1418 mutex_unlock(®ulator_list_mutex
);
1419 return map
->regulator
;
1422 mutex_unlock(®ulator_list_mutex
);
1427 static int regulator_resolve_supply(struct regulator_dev
*rdev
)
1429 struct regulator_dev
*r
;
1430 struct device
*dev
= rdev
->dev
.parent
;
1433 /* No supply to resovle? */
1434 if (!rdev
->supply_name
)
1437 /* Supply already resolved? */
1441 r
= regulator_dev_lookup(dev
, rdev
->supply_name
, &ret
);
1443 if (ret
== -ENODEV
) {
1445 * No supply was specified for this regulator and
1446 * there will never be one.
1451 /* Did the lookup explicitly defer for us? */
1452 if (ret
== -EPROBE_DEFER
)
1455 if (have_full_constraints()) {
1456 r
= dummy_regulator_rdev
;
1457 get_device(&r
->dev
);
1459 dev_err(dev
, "Failed to resolve %s-supply for %s\n",
1460 rdev
->supply_name
, rdev
->desc
->name
);
1461 return -EPROBE_DEFER
;
1465 /* Recursively resolve the supply of the supply */
1466 ret
= regulator_resolve_supply(r
);
1468 put_device(&r
->dev
);
1472 ret
= set_supply(rdev
, r
);
1474 put_device(&r
->dev
);
1478 /* Cascade always-on state to supply */
1479 if (_regulator_is_enabled(rdev
) && rdev
->supply
) {
1480 ret
= regulator_enable(rdev
->supply
);
1482 _regulator_put(rdev
->supply
);
1490 /* Internal regulator request function */
1491 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1492 bool exclusive
, bool allow_dummy
)
1494 struct regulator_dev
*rdev
;
1495 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1496 const char *devname
= NULL
;
1500 pr_err("get() with no identifier\n");
1501 return ERR_PTR(-EINVAL
);
1505 devname
= dev_name(dev
);
1507 if (have_full_constraints())
1510 ret
= -EPROBE_DEFER
;
1512 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1516 regulator
= ERR_PTR(ret
);
1519 * If we have return value from dev_lookup fail, we do not expect to
1520 * succeed, so, quit with appropriate error value
1522 if (ret
&& ret
!= -ENODEV
)
1526 devname
= "deviceless";
1529 * Assume that a regulator is physically present and enabled
1530 * even if it isn't hooked up and just provide a dummy.
1532 if (have_full_constraints() && allow_dummy
) {
1533 pr_warn("%s supply %s not found, using dummy regulator\n",
1536 rdev
= dummy_regulator_rdev
;
1537 get_device(&rdev
->dev
);
1539 /* Don't log an error when called from regulator_get_optional() */
1540 } else if (!have_full_constraints() || exclusive
) {
1541 dev_warn(dev
, "dummy supplies not allowed\n");
1547 if (rdev
->exclusive
) {
1548 regulator
= ERR_PTR(-EPERM
);
1549 put_device(&rdev
->dev
);
1553 if (exclusive
&& rdev
->open_count
) {
1554 regulator
= ERR_PTR(-EBUSY
);
1555 put_device(&rdev
->dev
);
1559 ret
= regulator_resolve_supply(rdev
);
1561 regulator
= ERR_PTR(ret
);
1562 put_device(&rdev
->dev
);
1566 if (!try_module_get(rdev
->owner
)) {
1567 put_device(&rdev
->dev
);
1571 regulator
= create_regulator(rdev
, dev
, id
);
1572 if (regulator
== NULL
) {
1573 regulator
= ERR_PTR(-ENOMEM
);
1574 put_device(&rdev
->dev
);
1575 module_put(rdev
->owner
);
1581 rdev
->exclusive
= 1;
1583 ret
= _regulator_is_enabled(rdev
);
1585 rdev
->use_count
= 1;
1587 rdev
->use_count
= 0;
1594 * regulator_get - lookup and obtain a reference to a regulator.
1595 * @dev: device for regulator "consumer"
1596 * @id: Supply name or regulator ID.
1598 * Returns a struct regulator corresponding to the regulator producer,
1599 * or IS_ERR() condition containing errno.
1601 * Use of supply names configured via regulator_set_device_supply() is
1602 * strongly encouraged. It is recommended that the supply name used
1603 * should match the name used for the supply and/or the relevant
1604 * device pins in the datasheet.
1606 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1608 return _regulator_get(dev
, id
, false, true);
1610 EXPORT_SYMBOL_GPL(regulator_get
);
1613 * regulator_get_exclusive - obtain exclusive access to a regulator.
1614 * @dev: device for regulator "consumer"
1615 * @id: Supply name or regulator ID.
1617 * Returns a struct regulator corresponding to the regulator producer,
1618 * or IS_ERR() condition containing errno. Other consumers will be
1619 * unable to obtain this regulator while this reference is held and the
1620 * use count for the regulator will be initialised to reflect the current
1621 * state of the regulator.
1623 * This is intended for use by consumers which cannot tolerate shared
1624 * use of the regulator such as those which need to force the
1625 * regulator off for correct operation of the hardware they are
1628 * Use of supply names configured via regulator_set_device_supply() is
1629 * strongly encouraged. It is recommended that the supply name used
1630 * should match the name used for the supply and/or the relevant
1631 * device pins in the datasheet.
1633 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1635 return _regulator_get(dev
, id
, true, false);
1637 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1640 * regulator_get_optional - obtain optional access to a regulator.
1641 * @dev: device for regulator "consumer"
1642 * @id: Supply name or regulator ID.
1644 * Returns a struct regulator corresponding to the regulator producer,
1645 * or IS_ERR() condition containing errno.
1647 * This is intended for use by consumers for devices which can have
1648 * some supplies unconnected in normal use, such as some MMC devices.
1649 * It can allow the regulator core to provide stub supplies for other
1650 * supplies requested using normal regulator_get() calls without
1651 * disrupting the operation of drivers that can handle absent
1654 * Use of supply names configured via regulator_set_device_supply() is
1655 * strongly encouraged. It is recommended that the supply name used
1656 * should match the name used for the supply and/or the relevant
1657 * device pins in the datasheet.
1659 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1661 return _regulator_get(dev
, id
, false, false);
1663 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1665 /* regulator_list_mutex lock held by regulator_put() */
1666 static void _regulator_put(struct regulator
*regulator
)
1668 struct regulator_dev
*rdev
;
1670 if (IS_ERR_OR_NULL(regulator
))
1673 lockdep_assert_held_once(®ulator_list_mutex
);
1675 rdev
= regulator
->rdev
;
1677 debugfs_remove_recursive(regulator
->debugfs
);
1679 /* remove any sysfs entries */
1681 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1682 mutex_lock(&rdev
->mutex
);
1683 list_del(®ulator
->list
);
1686 rdev
->exclusive
= 0;
1687 put_device(&rdev
->dev
);
1688 mutex_unlock(&rdev
->mutex
);
1690 kfree(regulator
->supply_name
);
1693 module_put(rdev
->owner
);
1697 * regulator_put - "free" the regulator source
1698 * @regulator: regulator source
1700 * Note: drivers must ensure that all regulator_enable calls made on this
1701 * regulator source are balanced by regulator_disable calls prior to calling
1704 void regulator_put(struct regulator
*regulator
)
1706 mutex_lock(®ulator_list_mutex
);
1707 _regulator_put(regulator
);
1708 mutex_unlock(®ulator_list_mutex
);
1710 EXPORT_SYMBOL_GPL(regulator_put
);
1713 * regulator_register_supply_alias - Provide device alias for supply lookup
1715 * @dev: device that will be given as the regulator "consumer"
1716 * @id: Supply name or regulator ID
1717 * @alias_dev: device that should be used to lookup the supply
1718 * @alias_id: Supply name or regulator ID that should be used to lookup the
1721 * All lookups for id on dev will instead be conducted for alias_id on
1724 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1725 struct device
*alias_dev
,
1726 const char *alias_id
)
1728 struct regulator_supply_alias
*map
;
1730 map
= regulator_find_supply_alias(dev
, id
);
1734 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1739 map
->src_supply
= id
;
1740 map
->alias_dev
= alias_dev
;
1741 map
->alias_supply
= alias_id
;
1743 list_add(&map
->list
, ®ulator_supply_alias_list
);
1745 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1746 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1750 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1753 * regulator_unregister_supply_alias - Remove device alias
1755 * @dev: device that will be given as the regulator "consumer"
1756 * @id: Supply name or regulator ID
1758 * Remove a lookup alias if one exists for id on dev.
1760 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1762 struct regulator_supply_alias
*map
;
1764 map
= regulator_find_supply_alias(dev
, id
);
1766 list_del(&map
->list
);
1770 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1773 * regulator_bulk_register_supply_alias - register multiple aliases
1775 * @dev: device that will be given as the regulator "consumer"
1776 * @id: List of supply names or regulator IDs
1777 * @alias_dev: device that should be used to lookup the supply
1778 * @alias_id: List of supply names or regulator IDs that should be used to
1780 * @num_id: Number of aliases to register
1782 * @return 0 on success, an errno on failure.
1784 * This helper function allows drivers to register several supply
1785 * aliases in one operation. If any of the aliases cannot be
1786 * registered any aliases that were registered will be removed
1787 * before returning to the caller.
1789 int regulator_bulk_register_supply_alias(struct device
*dev
,
1790 const char *const *id
,
1791 struct device
*alias_dev
,
1792 const char *const *alias_id
,
1798 for (i
= 0; i
< num_id
; ++i
) {
1799 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1809 "Failed to create supply alias %s,%s -> %s,%s\n",
1810 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1813 regulator_unregister_supply_alias(dev
, id
[i
]);
1817 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1820 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1822 * @dev: device that will be given as the regulator "consumer"
1823 * @id: List of supply names or regulator IDs
1824 * @num_id: Number of aliases to unregister
1826 * This helper function allows drivers to unregister several supply
1827 * aliases in one operation.
1829 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1830 const char *const *id
,
1835 for (i
= 0; i
< num_id
; ++i
)
1836 regulator_unregister_supply_alias(dev
, id
[i
]);
1838 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1841 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1842 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1843 const struct regulator_config
*config
)
1845 struct regulator_enable_gpio
*pin
;
1846 struct gpio_desc
*gpiod
;
1849 gpiod
= gpio_to_desc(config
->ena_gpio
);
1851 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1852 if (pin
->gpiod
== gpiod
) {
1853 rdev_dbg(rdev
, "GPIO %d is already used\n",
1855 goto update_ena_gpio_to_rdev
;
1859 ret
= gpio_request_one(config
->ena_gpio
,
1860 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1861 rdev_get_name(rdev
));
1865 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1867 gpio_free(config
->ena_gpio
);
1872 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1873 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1875 update_ena_gpio_to_rdev
:
1876 pin
->request_count
++;
1877 rdev
->ena_pin
= pin
;
1881 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1883 struct regulator_enable_gpio
*pin
, *n
;
1888 /* Free the GPIO only in case of no use */
1889 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1890 if (pin
->gpiod
== rdev
->ena_pin
->gpiod
) {
1891 if (pin
->request_count
<= 1) {
1892 pin
->request_count
= 0;
1893 gpiod_put(pin
->gpiod
);
1894 list_del(&pin
->list
);
1896 rdev
->ena_pin
= NULL
;
1899 pin
->request_count
--;
1906 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1907 * @rdev: regulator_dev structure
1908 * @enable: enable GPIO at initial use?
1910 * GPIO is enabled in case of initial use. (enable_count is 0)
1911 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1913 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1915 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1921 /* Enable GPIO at initial use */
1922 if (pin
->enable_count
== 0)
1923 gpiod_set_value_cansleep(pin
->gpiod
,
1924 !pin
->ena_gpio_invert
);
1926 pin
->enable_count
++;
1928 if (pin
->enable_count
> 1) {
1929 pin
->enable_count
--;
1933 /* Disable GPIO if not used */
1934 if (pin
->enable_count
<= 1) {
1935 gpiod_set_value_cansleep(pin
->gpiod
,
1936 pin
->ena_gpio_invert
);
1937 pin
->enable_count
= 0;
1945 * _regulator_enable_delay - a delay helper function
1946 * @delay: time to delay in microseconds
1948 * Delay for the requested amount of time as per the guidelines in:
1950 * Documentation/timers/timers-howto.txt
1952 * The assumption here is that regulators will never be enabled in
1953 * atomic context and therefore sleeping functions can be used.
1955 static void _regulator_enable_delay(unsigned int delay
)
1957 unsigned int ms
= delay
/ 1000;
1958 unsigned int us
= delay
% 1000;
1962 * For small enough values, handle super-millisecond
1963 * delays in the usleep_range() call below.
1972 * Give the scheduler some room to coalesce with any other
1973 * wakeup sources. For delays shorter than 10 us, don't even
1974 * bother setting up high-resolution timers and just busy-
1978 usleep_range(us
, us
+ 100);
1983 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1987 /* Query before enabling in case configuration dependent. */
1988 ret
= _regulator_get_enable_time(rdev
);
1992 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1996 trace_regulator_enable(rdev_get_name(rdev
));
1998 if (rdev
->desc
->off_on_delay
) {
1999 /* if needed, keep a distance of off_on_delay from last time
2000 * this regulator was disabled.
2002 unsigned long start_jiffy
= jiffies
;
2003 unsigned long intended
, max_delay
, remaining
;
2005 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
2006 intended
= rdev
->last_off_jiffy
+ max_delay
;
2008 if (time_before(start_jiffy
, intended
)) {
2009 /* calc remaining jiffies to deal with one-time
2011 * in case of multiple timer wrapping, either it can be
2012 * detected by out-of-range remaining, or it cannot be
2013 * detected and we gets a panelty of
2014 * _regulator_enable_delay().
2016 remaining
= intended
- start_jiffy
;
2017 if (remaining
<= max_delay
)
2018 _regulator_enable_delay(
2019 jiffies_to_usecs(remaining
));
2023 if (rdev
->ena_pin
) {
2024 if (!rdev
->ena_gpio_state
) {
2025 ret
= regulator_ena_gpio_ctrl(rdev
, true);
2028 rdev
->ena_gpio_state
= 1;
2030 } else if (rdev
->desc
->ops
->enable
) {
2031 ret
= rdev
->desc
->ops
->enable(rdev
);
2038 /* Allow the regulator to ramp; it would be useful to extend
2039 * this for bulk operations so that the regulators can ramp
2041 trace_regulator_enable_delay(rdev_get_name(rdev
));
2043 _regulator_enable_delay(delay
);
2045 trace_regulator_enable_complete(rdev_get_name(rdev
));
2050 /* locks held by regulator_enable() */
2051 static int _regulator_enable(struct regulator_dev
*rdev
)
2055 lockdep_assert_held_once(&rdev
->mutex
);
2057 /* check voltage and requested load before enabling */
2058 if (rdev
->constraints
&&
2059 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
2060 drms_uA_update(rdev
);
2062 if (rdev
->use_count
== 0) {
2063 /* The regulator may on if it's not switchable or left on */
2064 ret
= _regulator_is_enabled(rdev
);
2065 if (ret
== -EINVAL
|| ret
== 0) {
2066 if (!_regulator_can_change_status(rdev
))
2069 ret
= _regulator_do_enable(rdev
);
2073 } else if (ret
< 0) {
2074 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
2077 /* Fallthrough on positive return values - already enabled */
2086 * regulator_enable - enable regulator output
2087 * @regulator: regulator source
2089 * Request that the regulator be enabled with the regulator output at
2090 * the predefined voltage or current value. Calls to regulator_enable()
2091 * must be balanced with calls to regulator_disable().
2093 * NOTE: the output value can be set by other drivers, boot loader or may be
2094 * hardwired in the regulator.
2096 int regulator_enable(struct regulator
*regulator
)
2098 struct regulator_dev
*rdev
= regulator
->rdev
;
2101 if (regulator
->always_on
)
2105 ret
= regulator_enable(rdev
->supply
);
2110 mutex_lock(&rdev
->mutex
);
2111 ret
= _regulator_enable(rdev
);
2112 mutex_unlock(&rdev
->mutex
);
2114 if (ret
!= 0 && rdev
->supply
)
2115 regulator_disable(rdev
->supply
);
2119 EXPORT_SYMBOL_GPL(regulator_enable
);
2121 static int _regulator_do_disable(struct regulator_dev
*rdev
)
2125 trace_regulator_disable(rdev_get_name(rdev
));
2127 if (rdev
->ena_pin
) {
2128 if (rdev
->ena_gpio_state
) {
2129 ret
= regulator_ena_gpio_ctrl(rdev
, false);
2132 rdev
->ena_gpio_state
= 0;
2135 } else if (rdev
->desc
->ops
->disable
) {
2136 ret
= rdev
->desc
->ops
->disable(rdev
);
2141 /* cares about last_off_jiffy only if off_on_delay is required by
2144 if (rdev
->desc
->off_on_delay
)
2145 rdev
->last_off_jiffy
= jiffies
;
2147 trace_regulator_disable_complete(rdev_get_name(rdev
));
2152 /* locks held by regulator_disable() */
2153 static int _regulator_disable(struct regulator_dev
*rdev
)
2157 lockdep_assert_held_once(&rdev
->mutex
);
2159 if (WARN(rdev
->use_count
<= 0,
2160 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
2163 /* are we the last user and permitted to disable ? */
2164 if (rdev
->use_count
== 1 &&
2165 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
2167 /* we are last user */
2168 if (_regulator_can_change_status(rdev
)) {
2169 ret
= _notifier_call_chain(rdev
,
2170 REGULATOR_EVENT_PRE_DISABLE
,
2172 if (ret
& NOTIFY_STOP_MASK
)
2175 ret
= _regulator_do_disable(rdev
);
2177 rdev_err(rdev
, "failed to disable\n");
2178 _notifier_call_chain(rdev
,
2179 REGULATOR_EVENT_ABORT_DISABLE
,
2183 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
2187 rdev
->use_count
= 0;
2188 } else if (rdev
->use_count
> 1) {
2190 if (rdev
->constraints
&&
2191 (rdev
->constraints
->valid_ops_mask
&
2192 REGULATOR_CHANGE_DRMS
))
2193 drms_uA_update(rdev
);
2202 * regulator_disable - disable regulator output
2203 * @regulator: regulator source
2205 * Disable the regulator output voltage or current. Calls to
2206 * regulator_enable() must be balanced with calls to
2207 * regulator_disable().
2209 * NOTE: this will only disable the regulator output if no other consumer
2210 * devices have it enabled, the regulator device supports disabling and
2211 * machine constraints permit this operation.
2213 int regulator_disable(struct regulator
*regulator
)
2215 struct regulator_dev
*rdev
= regulator
->rdev
;
2218 if (regulator
->always_on
)
2221 mutex_lock(&rdev
->mutex
);
2222 ret
= _regulator_disable(rdev
);
2223 mutex_unlock(&rdev
->mutex
);
2225 if (ret
== 0 && rdev
->supply
)
2226 regulator_disable(rdev
->supply
);
2230 EXPORT_SYMBOL_GPL(regulator_disable
);
2232 /* locks held by regulator_force_disable() */
2233 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2237 lockdep_assert_held_once(&rdev
->mutex
);
2239 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2240 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2241 if (ret
& NOTIFY_STOP_MASK
)
2244 ret
= _regulator_do_disable(rdev
);
2246 rdev_err(rdev
, "failed to force disable\n");
2247 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2248 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2252 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2253 REGULATOR_EVENT_DISABLE
, NULL
);
2259 * regulator_force_disable - force disable regulator output
2260 * @regulator: regulator source
2262 * Forcibly disable the regulator output voltage or current.
2263 * NOTE: this *will* disable the regulator output even if other consumer
2264 * devices have it enabled. This should be used for situations when device
2265 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2267 int regulator_force_disable(struct regulator
*regulator
)
2269 struct regulator_dev
*rdev
= regulator
->rdev
;
2272 mutex_lock(&rdev
->mutex
);
2273 regulator
->uA_load
= 0;
2274 ret
= _regulator_force_disable(regulator
->rdev
);
2275 mutex_unlock(&rdev
->mutex
);
2278 while (rdev
->open_count
--)
2279 regulator_disable(rdev
->supply
);
2283 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2285 static void regulator_disable_work(struct work_struct
*work
)
2287 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2291 mutex_lock(&rdev
->mutex
);
2293 BUG_ON(!rdev
->deferred_disables
);
2295 count
= rdev
->deferred_disables
;
2296 rdev
->deferred_disables
= 0;
2298 for (i
= 0; i
< count
; i
++) {
2299 ret
= _regulator_disable(rdev
);
2301 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2304 mutex_unlock(&rdev
->mutex
);
2307 for (i
= 0; i
< count
; i
++) {
2308 ret
= regulator_disable(rdev
->supply
);
2311 "Supply disable failed: %d\n", ret
);
2318 * regulator_disable_deferred - disable regulator output with delay
2319 * @regulator: regulator source
2320 * @ms: miliseconds until the regulator is disabled
2322 * Execute regulator_disable() on the regulator after a delay. This
2323 * is intended for use with devices that require some time to quiesce.
2325 * NOTE: this will only disable the regulator output if no other consumer
2326 * devices have it enabled, the regulator device supports disabling and
2327 * machine constraints permit this operation.
2329 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2331 struct regulator_dev
*rdev
= regulator
->rdev
;
2334 if (regulator
->always_on
)
2338 return regulator_disable(regulator
);
2340 mutex_lock(&rdev
->mutex
);
2341 rdev
->deferred_disables
++;
2342 mutex_unlock(&rdev
->mutex
);
2344 ret
= queue_delayed_work(system_power_efficient_wq
,
2345 &rdev
->disable_work
,
2346 msecs_to_jiffies(ms
));
2352 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2354 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2356 /* A GPIO control always takes precedence */
2358 return rdev
->ena_gpio_state
;
2360 /* If we don't know then assume that the regulator is always on */
2361 if (!rdev
->desc
->ops
->is_enabled
)
2364 return rdev
->desc
->ops
->is_enabled(rdev
);
2368 * regulator_is_enabled - is the regulator output enabled
2369 * @regulator: regulator source
2371 * Returns positive if the regulator driver backing the source/client
2372 * has requested that the device be enabled, zero if it hasn't, else a
2373 * negative errno code.
2375 * Note that the device backing this regulator handle can have multiple
2376 * users, so it might be enabled even if regulator_enable() was never
2377 * called for this particular source.
2379 int regulator_is_enabled(struct regulator
*regulator
)
2383 if (regulator
->always_on
)
2386 mutex_lock(®ulator
->rdev
->mutex
);
2387 ret
= _regulator_is_enabled(regulator
->rdev
);
2388 mutex_unlock(®ulator
->rdev
->mutex
);
2392 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2395 * regulator_can_change_voltage - check if regulator can change voltage
2396 * @regulator: regulator source
2398 * Returns positive if the regulator driver backing the source/client
2399 * can change its voltage, false otherwise. Useful for detecting fixed
2400 * or dummy regulators and disabling voltage change logic in the client
2403 int regulator_can_change_voltage(struct regulator
*regulator
)
2405 struct regulator_dev
*rdev
= regulator
->rdev
;
2407 if (rdev
->constraints
&&
2408 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2409 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2412 if (rdev
->desc
->continuous_voltage_range
&&
2413 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2414 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2420 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2423 * regulator_count_voltages - count regulator_list_voltage() selectors
2424 * @regulator: regulator source
2426 * Returns number of selectors, or negative errno. Selectors are
2427 * numbered starting at zero, and typically correspond to bitfields
2428 * in hardware registers.
2430 int regulator_count_voltages(struct regulator
*regulator
)
2432 struct regulator_dev
*rdev
= regulator
->rdev
;
2434 if (rdev
->desc
->n_voltages
)
2435 return rdev
->desc
->n_voltages
;
2440 return regulator_count_voltages(rdev
->supply
);
2442 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2445 * regulator_list_voltage - enumerate supported voltages
2446 * @regulator: regulator source
2447 * @selector: identify voltage to list
2448 * Context: can sleep
2450 * Returns a voltage that can be passed to @regulator_set_voltage(),
2451 * zero if this selector code can't be used on this system, or a
2454 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2456 struct regulator_dev
*rdev
= regulator
->rdev
;
2457 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2460 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2461 return rdev
->desc
->fixed_uV
;
2463 if (ops
->list_voltage
) {
2464 if (selector
>= rdev
->desc
->n_voltages
)
2466 mutex_lock(&rdev
->mutex
);
2467 ret
= ops
->list_voltage(rdev
, selector
);
2468 mutex_unlock(&rdev
->mutex
);
2469 } else if (rdev
->supply
) {
2470 ret
= regulator_list_voltage(rdev
->supply
, selector
);
2476 if (ret
< rdev
->constraints
->min_uV
)
2478 else if (ret
> rdev
->constraints
->max_uV
)
2484 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2487 * regulator_get_regmap - get the regulator's register map
2488 * @regulator: regulator source
2490 * Returns the register map for the given regulator, or an ERR_PTR value
2491 * if the regulator doesn't use regmap.
2493 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
2495 struct regmap
*map
= regulator
->rdev
->regmap
;
2497 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
2501 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2502 * @regulator: regulator source
2503 * @vsel_reg: voltage selector register, output parameter
2504 * @vsel_mask: mask for voltage selector bitfield, output parameter
2506 * Returns the hardware register offset and bitmask used for setting the
2507 * regulator voltage. This might be useful when configuring voltage-scaling
2508 * hardware or firmware that can make I2C requests behind the kernel's back,
2511 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2512 * and 0 is returned, otherwise a negative errno is returned.
2514 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
2516 unsigned *vsel_mask
)
2518 struct regulator_dev
*rdev
= regulator
->rdev
;
2519 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2521 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2524 *vsel_reg
= rdev
->desc
->vsel_reg
;
2525 *vsel_mask
= rdev
->desc
->vsel_mask
;
2529 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
2532 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2533 * @regulator: regulator source
2534 * @selector: identify voltage to list
2536 * Converts the selector to a hardware-specific voltage selector that can be
2537 * directly written to the regulator registers. The address of the voltage
2538 * register can be determined by calling @regulator_get_hardware_vsel_register.
2540 * On error a negative errno is returned.
2542 int regulator_list_hardware_vsel(struct regulator
*regulator
,
2545 struct regulator_dev
*rdev
= regulator
->rdev
;
2546 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2548 if (selector
>= rdev
->desc
->n_voltages
)
2550 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2555 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
2558 * regulator_get_linear_step - return the voltage step size between VSEL values
2559 * @regulator: regulator source
2561 * Returns the voltage step size between VSEL values for linear
2562 * regulators, or return 0 if the regulator isn't a linear regulator.
2564 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2566 struct regulator_dev
*rdev
= regulator
->rdev
;
2568 return rdev
->desc
->uV_step
;
2570 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2573 * regulator_is_supported_voltage - check if a voltage range can be supported
2575 * @regulator: Regulator to check.
2576 * @min_uV: Minimum required voltage in uV.
2577 * @max_uV: Maximum required voltage in uV.
2579 * Returns a boolean or a negative error code.
2581 int regulator_is_supported_voltage(struct regulator
*regulator
,
2582 int min_uV
, int max_uV
)
2584 struct regulator_dev
*rdev
= regulator
->rdev
;
2585 int i
, voltages
, ret
;
2587 /* If we can't change voltage check the current voltage */
2588 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2589 ret
= regulator_get_voltage(regulator
);
2591 return min_uV
<= ret
&& ret
<= max_uV
;
2596 /* Any voltage within constrains range is fine? */
2597 if (rdev
->desc
->continuous_voltage_range
)
2598 return min_uV
>= rdev
->constraints
->min_uV
&&
2599 max_uV
<= rdev
->constraints
->max_uV
;
2601 ret
= regulator_count_voltages(regulator
);
2606 for (i
= 0; i
< voltages
; i
++) {
2607 ret
= regulator_list_voltage(regulator
, i
);
2609 if (ret
>= min_uV
&& ret
<= max_uV
)
2615 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2617 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
2618 int min_uV
, int max_uV
,
2621 struct pre_voltage_change_data data
;
2624 data
.old_uV
= _regulator_get_voltage(rdev
);
2625 data
.min_uV
= min_uV
;
2626 data
.max_uV
= max_uV
;
2627 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2629 if (ret
& NOTIFY_STOP_MASK
)
2632 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
2636 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2637 (void *)data
.old_uV
);
2642 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
2643 int uV
, unsigned selector
)
2645 struct pre_voltage_change_data data
;
2648 data
.old_uV
= _regulator_get_voltage(rdev
);
2651 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2653 if (ret
& NOTIFY_STOP_MASK
)
2656 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
2660 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2661 (void *)data
.old_uV
);
2666 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2667 int min_uV
, int max_uV
)
2672 unsigned int selector
;
2673 int old_selector
= -1;
2675 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2677 min_uV
+= rdev
->constraints
->uV_offset
;
2678 max_uV
+= rdev
->constraints
->uV_offset
;
2681 * If we can't obtain the old selector there is not enough
2682 * info to call set_voltage_time_sel().
2684 if (_regulator_is_enabled(rdev
) &&
2685 rdev
->desc
->ops
->set_voltage_time_sel
&&
2686 rdev
->desc
->ops
->get_voltage_sel
) {
2687 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2688 if (old_selector
< 0)
2689 return old_selector
;
2692 if (rdev
->desc
->ops
->set_voltage
) {
2693 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
2697 if (rdev
->desc
->ops
->list_voltage
)
2698 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2701 best_val
= _regulator_get_voltage(rdev
);
2704 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2705 if (rdev
->desc
->ops
->map_voltage
) {
2706 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2709 if (rdev
->desc
->ops
->list_voltage
==
2710 regulator_list_voltage_linear
)
2711 ret
= regulator_map_voltage_linear(rdev
,
2713 else if (rdev
->desc
->ops
->list_voltage
==
2714 regulator_list_voltage_linear_range
)
2715 ret
= regulator_map_voltage_linear_range(rdev
,
2718 ret
= regulator_map_voltage_iterate(rdev
,
2723 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2724 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2726 if (old_selector
== selector
)
2729 ret
= _regulator_call_set_voltage_sel(
2730 rdev
, best_val
, selector
);
2739 /* Call set_voltage_time_sel if successfully obtained old_selector */
2740 if (ret
== 0 && !rdev
->constraints
->ramp_disable
&& old_selector
>= 0
2741 && old_selector
!= selector
) {
2743 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2744 old_selector
, selector
);
2746 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2751 /* Insert any necessary delays */
2752 if (delay
>= 1000) {
2753 mdelay(delay
/ 1000);
2754 udelay(delay
% 1000);
2760 if (ret
== 0 && best_val
>= 0) {
2761 unsigned long data
= best_val
;
2763 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2767 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2773 * regulator_set_voltage - set regulator output voltage
2774 * @regulator: regulator source
2775 * @min_uV: Minimum required voltage in uV
2776 * @max_uV: Maximum acceptable voltage in uV
2778 * Sets a voltage regulator to the desired output voltage. This can be set
2779 * during any regulator state. IOW, regulator can be disabled or enabled.
2781 * If the regulator is enabled then the voltage will change to the new value
2782 * immediately otherwise if the regulator is disabled the regulator will
2783 * output at the new voltage when enabled.
2785 * NOTE: If the regulator is shared between several devices then the lowest
2786 * request voltage that meets the system constraints will be used.
2787 * Regulator system constraints must be set for this regulator before
2788 * calling this function otherwise this call will fail.
2790 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2792 struct regulator_dev
*rdev
= regulator
->rdev
;
2794 int old_min_uV
, old_max_uV
;
2797 mutex_lock(&rdev
->mutex
);
2799 /* If we're setting the same range as last time the change
2800 * should be a noop (some cpufreq implementations use the same
2801 * voltage for multiple frequencies, for example).
2803 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2806 /* If we're trying to set a range that overlaps the current voltage,
2807 * return successfully even though the regulator does not support
2808 * changing the voltage.
2810 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2811 current_uV
= _regulator_get_voltage(rdev
);
2812 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
2813 regulator
->min_uV
= min_uV
;
2814 regulator
->max_uV
= max_uV
;
2820 if (!rdev
->desc
->ops
->set_voltage
&&
2821 !rdev
->desc
->ops
->set_voltage_sel
) {
2826 /* constraints check */
2827 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2831 /* restore original values in case of error */
2832 old_min_uV
= regulator
->min_uV
;
2833 old_max_uV
= regulator
->max_uV
;
2834 regulator
->min_uV
= min_uV
;
2835 regulator
->max_uV
= max_uV
;
2837 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2841 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2846 mutex_unlock(&rdev
->mutex
);
2849 regulator
->min_uV
= old_min_uV
;
2850 regulator
->max_uV
= old_max_uV
;
2851 mutex_unlock(&rdev
->mutex
);
2854 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2857 * regulator_set_voltage_time - get raise/fall time
2858 * @regulator: regulator source
2859 * @old_uV: starting voltage in microvolts
2860 * @new_uV: target voltage in microvolts
2862 * Provided with the starting and ending voltage, this function attempts to
2863 * calculate the time in microseconds required to rise or fall to this new
2866 int regulator_set_voltage_time(struct regulator
*regulator
,
2867 int old_uV
, int new_uV
)
2869 struct regulator_dev
*rdev
= regulator
->rdev
;
2870 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2876 /* Currently requires operations to do this */
2877 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2878 || !rdev
->desc
->n_voltages
)
2881 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2882 /* We only look for exact voltage matches here */
2883 voltage
= regulator_list_voltage(regulator
, i
);
2888 if (voltage
== old_uV
)
2890 if (voltage
== new_uV
)
2894 if (old_sel
< 0 || new_sel
< 0)
2897 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2899 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2902 * regulator_set_voltage_time_sel - get raise/fall time
2903 * @rdev: regulator source device
2904 * @old_selector: selector for starting voltage
2905 * @new_selector: selector for target voltage
2907 * Provided with the starting and target voltage selectors, this function
2908 * returns time in microseconds required to rise or fall to this new voltage
2910 * Drivers providing ramp_delay in regulation_constraints can use this as their
2911 * set_voltage_time_sel() operation.
2913 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2914 unsigned int old_selector
,
2915 unsigned int new_selector
)
2917 unsigned int ramp_delay
= 0;
2918 int old_volt
, new_volt
;
2920 if (rdev
->constraints
->ramp_delay
)
2921 ramp_delay
= rdev
->constraints
->ramp_delay
;
2922 else if (rdev
->desc
->ramp_delay
)
2923 ramp_delay
= rdev
->desc
->ramp_delay
;
2925 if (ramp_delay
== 0) {
2926 rdev_warn(rdev
, "ramp_delay not set\n");
2931 if (!rdev
->desc
->ops
->list_voltage
)
2934 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2935 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2937 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2939 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2942 * regulator_sync_voltage - re-apply last regulator output voltage
2943 * @regulator: regulator source
2945 * Re-apply the last configured voltage. This is intended to be used
2946 * where some external control source the consumer is cooperating with
2947 * has caused the configured voltage to change.
2949 int regulator_sync_voltage(struct regulator
*regulator
)
2951 struct regulator_dev
*rdev
= regulator
->rdev
;
2952 int ret
, min_uV
, max_uV
;
2954 mutex_lock(&rdev
->mutex
);
2956 if (!rdev
->desc
->ops
->set_voltage
&&
2957 !rdev
->desc
->ops
->set_voltage_sel
) {
2962 /* This is only going to work if we've had a voltage configured. */
2963 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2968 min_uV
= regulator
->min_uV
;
2969 max_uV
= regulator
->max_uV
;
2971 /* This should be a paranoia check... */
2972 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2976 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2980 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2983 mutex_unlock(&rdev
->mutex
);
2986 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2988 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2992 if (rdev
->desc
->ops
->get_voltage_sel
) {
2993 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2996 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2997 } else if (rdev
->desc
->ops
->get_voltage
) {
2998 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2999 } else if (rdev
->desc
->ops
->list_voltage
) {
3000 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
3001 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
3002 ret
= rdev
->desc
->fixed_uV
;
3003 } else if (rdev
->supply
) {
3004 ret
= regulator_get_voltage(rdev
->supply
);
3011 return ret
- rdev
->constraints
->uV_offset
;
3015 * regulator_get_voltage - get regulator output voltage
3016 * @regulator: regulator source
3018 * This returns the current regulator voltage in uV.
3020 * NOTE: If the regulator is disabled it will return the voltage value. This
3021 * function should not be used to determine regulator state.
3023 int regulator_get_voltage(struct regulator
*regulator
)
3027 mutex_lock(®ulator
->rdev
->mutex
);
3029 ret
= _regulator_get_voltage(regulator
->rdev
);
3031 mutex_unlock(®ulator
->rdev
->mutex
);
3035 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
3038 * regulator_set_current_limit - set regulator output current limit
3039 * @regulator: regulator source
3040 * @min_uA: Minimum supported current in uA
3041 * @max_uA: Maximum supported current in uA
3043 * Sets current sink to the desired output current. This can be set during
3044 * any regulator state. IOW, regulator can be disabled or enabled.
3046 * If the regulator is enabled then the current will change to the new value
3047 * immediately otherwise if the regulator is disabled the regulator will
3048 * output at the new current when enabled.
3050 * NOTE: Regulator system constraints must be set for this regulator before
3051 * calling this function otherwise this call will fail.
3053 int regulator_set_current_limit(struct regulator
*regulator
,
3054 int min_uA
, int max_uA
)
3056 struct regulator_dev
*rdev
= regulator
->rdev
;
3059 mutex_lock(&rdev
->mutex
);
3062 if (!rdev
->desc
->ops
->set_current_limit
) {
3067 /* constraints check */
3068 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
3072 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
3074 mutex_unlock(&rdev
->mutex
);
3077 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
3079 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
3083 mutex_lock(&rdev
->mutex
);
3086 if (!rdev
->desc
->ops
->get_current_limit
) {
3091 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
3093 mutex_unlock(&rdev
->mutex
);
3098 * regulator_get_current_limit - get regulator output current
3099 * @regulator: regulator source
3101 * This returns the current supplied by the specified current sink in uA.
3103 * NOTE: If the regulator is disabled it will return the current value. This
3104 * function should not be used to determine regulator state.
3106 int regulator_get_current_limit(struct regulator
*regulator
)
3108 return _regulator_get_current_limit(regulator
->rdev
);
3110 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
3113 * regulator_set_mode - set regulator operating mode
3114 * @regulator: regulator source
3115 * @mode: operating mode - one of the REGULATOR_MODE constants
3117 * Set regulator operating mode to increase regulator efficiency or improve
3118 * regulation performance.
3120 * NOTE: Regulator system constraints must be set for this regulator before
3121 * calling this function otherwise this call will fail.
3123 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
3125 struct regulator_dev
*rdev
= regulator
->rdev
;
3127 int regulator_curr_mode
;
3129 mutex_lock(&rdev
->mutex
);
3132 if (!rdev
->desc
->ops
->set_mode
) {
3137 /* return if the same mode is requested */
3138 if (rdev
->desc
->ops
->get_mode
) {
3139 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
3140 if (regulator_curr_mode
== mode
) {
3146 /* constraints check */
3147 ret
= regulator_mode_constrain(rdev
, &mode
);
3151 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
3153 mutex_unlock(&rdev
->mutex
);
3156 EXPORT_SYMBOL_GPL(regulator_set_mode
);
3158 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
3162 mutex_lock(&rdev
->mutex
);
3165 if (!rdev
->desc
->ops
->get_mode
) {
3170 ret
= rdev
->desc
->ops
->get_mode(rdev
);
3172 mutex_unlock(&rdev
->mutex
);
3177 * regulator_get_mode - get regulator operating mode
3178 * @regulator: regulator source
3180 * Get the current regulator operating mode.
3182 unsigned int regulator_get_mode(struct regulator
*regulator
)
3184 return _regulator_get_mode(regulator
->rdev
);
3186 EXPORT_SYMBOL_GPL(regulator_get_mode
);
3189 * regulator_set_load - set regulator load
3190 * @regulator: regulator source
3191 * @uA_load: load current
3193 * Notifies the regulator core of a new device load. This is then used by
3194 * DRMS (if enabled by constraints) to set the most efficient regulator
3195 * operating mode for the new regulator loading.
3197 * Consumer devices notify their supply regulator of the maximum power
3198 * they will require (can be taken from device datasheet in the power
3199 * consumption tables) when they change operational status and hence power
3200 * state. Examples of operational state changes that can affect power
3201 * consumption are :-
3203 * o Device is opened / closed.
3204 * o Device I/O is about to begin or has just finished.
3205 * o Device is idling in between work.
3207 * This information is also exported via sysfs to userspace.
3209 * DRMS will sum the total requested load on the regulator and change
3210 * to the most efficient operating mode if platform constraints allow.
3212 * On error a negative errno is returned.
3214 int regulator_set_load(struct regulator
*regulator
, int uA_load
)
3216 struct regulator_dev
*rdev
= regulator
->rdev
;
3219 mutex_lock(&rdev
->mutex
);
3220 regulator
->uA_load
= uA_load
;
3221 ret
= drms_uA_update(rdev
);
3222 mutex_unlock(&rdev
->mutex
);
3226 EXPORT_SYMBOL_GPL(regulator_set_load
);
3229 * regulator_allow_bypass - allow the regulator to go into bypass mode
3231 * @regulator: Regulator to configure
3232 * @enable: enable or disable bypass mode
3234 * Allow the regulator to go into bypass mode if all other consumers
3235 * for the regulator also enable bypass mode and the machine
3236 * constraints allow this. Bypass mode means that the regulator is
3237 * simply passing the input directly to the output with no regulation.
3239 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3241 struct regulator_dev
*rdev
= regulator
->rdev
;
3244 if (!rdev
->desc
->ops
->set_bypass
)
3247 if (rdev
->constraints
&&
3248 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
3251 mutex_lock(&rdev
->mutex
);
3253 if (enable
&& !regulator
->bypass
) {
3254 rdev
->bypass_count
++;
3256 if (rdev
->bypass_count
== rdev
->open_count
) {
3257 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3259 rdev
->bypass_count
--;
3262 } else if (!enable
&& regulator
->bypass
) {
3263 rdev
->bypass_count
--;
3265 if (rdev
->bypass_count
!= rdev
->open_count
) {
3266 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3268 rdev
->bypass_count
++;
3273 regulator
->bypass
= enable
;
3275 mutex_unlock(&rdev
->mutex
);
3279 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3282 * regulator_register_notifier - register regulator event notifier
3283 * @regulator: regulator source
3284 * @nb: notifier block
3286 * Register notifier block to receive regulator events.
3288 int regulator_register_notifier(struct regulator
*regulator
,
3289 struct notifier_block
*nb
)
3291 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3294 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3297 * regulator_unregister_notifier - unregister regulator event notifier
3298 * @regulator: regulator source
3299 * @nb: notifier block
3301 * Unregister regulator event notifier block.
3303 int regulator_unregister_notifier(struct regulator
*regulator
,
3304 struct notifier_block
*nb
)
3306 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3309 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3311 /* notify regulator consumers and downstream regulator consumers.
3312 * Note mutex must be held by caller.
3314 static int _notifier_call_chain(struct regulator_dev
*rdev
,
3315 unsigned long event
, void *data
)
3317 /* call rdev chain first */
3318 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3322 * regulator_bulk_get - get multiple regulator consumers
3324 * @dev: Device to supply
3325 * @num_consumers: Number of consumers to register
3326 * @consumers: Configuration of consumers; clients are stored here.
3328 * @return 0 on success, an errno on failure.
3330 * This helper function allows drivers to get several regulator
3331 * consumers in one operation. If any of the regulators cannot be
3332 * acquired then any regulators that were allocated will be freed
3333 * before returning to the caller.
3335 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3336 struct regulator_bulk_data
*consumers
)
3341 for (i
= 0; i
< num_consumers
; i
++)
3342 consumers
[i
].consumer
= NULL
;
3344 for (i
= 0; i
< num_consumers
; i
++) {
3345 consumers
[i
].consumer
= regulator_get(dev
,
3346 consumers
[i
].supply
);
3347 if (IS_ERR(consumers
[i
].consumer
)) {
3348 ret
= PTR_ERR(consumers
[i
].consumer
);
3349 dev_err(dev
, "Failed to get supply '%s': %d\n",
3350 consumers
[i
].supply
, ret
);
3351 consumers
[i
].consumer
= NULL
;
3360 regulator_put(consumers
[i
].consumer
);
3364 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3366 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3368 struct regulator_bulk_data
*bulk
= data
;
3370 bulk
->ret
= regulator_enable(bulk
->consumer
);
3374 * regulator_bulk_enable - enable multiple regulator consumers
3376 * @num_consumers: Number of consumers
3377 * @consumers: Consumer data; clients are stored here.
3378 * @return 0 on success, an errno on failure
3380 * This convenience API allows consumers to enable multiple regulator
3381 * clients in a single API call. If any consumers cannot be enabled
3382 * then any others that were enabled will be disabled again prior to
3385 int regulator_bulk_enable(int num_consumers
,
3386 struct regulator_bulk_data
*consumers
)
3388 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3392 for (i
= 0; i
< num_consumers
; i
++) {
3393 if (consumers
[i
].consumer
->always_on
)
3394 consumers
[i
].ret
= 0;
3396 async_schedule_domain(regulator_bulk_enable_async
,
3397 &consumers
[i
], &async_domain
);
3400 async_synchronize_full_domain(&async_domain
);
3402 /* If any consumer failed we need to unwind any that succeeded */
3403 for (i
= 0; i
< num_consumers
; i
++) {
3404 if (consumers
[i
].ret
!= 0) {
3405 ret
= consumers
[i
].ret
;
3413 for (i
= 0; i
< num_consumers
; i
++) {
3414 if (consumers
[i
].ret
< 0)
3415 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3418 regulator_disable(consumers
[i
].consumer
);
3423 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3426 * regulator_bulk_disable - disable multiple regulator consumers
3428 * @num_consumers: Number of consumers
3429 * @consumers: Consumer data; clients are stored here.
3430 * @return 0 on success, an errno on failure
3432 * This convenience API allows consumers to disable multiple regulator
3433 * clients in a single API call. If any consumers cannot be disabled
3434 * then any others that were disabled will be enabled again prior to
3437 int regulator_bulk_disable(int num_consumers
,
3438 struct regulator_bulk_data
*consumers
)
3443 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3444 ret
= regulator_disable(consumers
[i
].consumer
);
3452 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3453 for (++i
; i
< num_consumers
; ++i
) {
3454 r
= regulator_enable(consumers
[i
].consumer
);
3456 pr_err("Failed to reename %s: %d\n",
3457 consumers
[i
].supply
, r
);
3462 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3465 * regulator_bulk_force_disable - force disable multiple regulator consumers
3467 * @num_consumers: Number of consumers
3468 * @consumers: Consumer data; clients are stored here.
3469 * @return 0 on success, an errno on failure
3471 * This convenience API allows consumers to forcibly disable multiple regulator
3472 * clients in a single API call.
3473 * NOTE: This should be used for situations when device damage will
3474 * likely occur if the regulators are not disabled (e.g. over temp).
3475 * Although regulator_force_disable function call for some consumers can
3476 * return error numbers, the function is called for all consumers.
3478 int regulator_bulk_force_disable(int num_consumers
,
3479 struct regulator_bulk_data
*consumers
)
3484 for (i
= 0; i
< num_consumers
; i
++)
3486 regulator_force_disable(consumers
[i
].consumer
);
3488 for (i
= 0; i
< num_consumers
; i
++) {
3489 if (consumers
[i
].ret
!= 0) {
3490 ret
= consumers
[i
].ret
;
3499 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3502 * regulator_bulk_free - free multiple regulator consumers
3504 * @num_consumers: Number of consumers
3505 * @consumers: Consumer data; clients are stored here.
3507 * This convenience API allows consumers to free multiple regulator
3508 * clients in a single API call.
3510 void regulator_bulk_free(int num_consumers
,
3511 struct regulator_bulk_data
*consumers
)
3515 for (i
= 0; i
< num_consumers
; i
++) {
3516 regulator_put(consumers
[i
].consumer
);
3517 consumers
[i
].consumer
= NULL
;
3520 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3523 * regulator_notifier_call_chain - call regulator event notifier
3524 * @rdev: regulator source
3525 * @event: notifier block
3526 * @data: callback-specific data.
3528 * Called by regulator drivers to notify clients a regulator event has
3529 * occurred. We also notify regulator clients downstream.
3530 * Note lock must be held by caller.
3532 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3533 unsigned long event
, void *data
)
3535 lockdep_assert_held_once(&rdev
->mutex
);
3537 _notifier_call_chain(rdev
, event
, data
);
3541 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3544 * regulator_mode_to_status - convert a regulator mode into a status
3546 * @mode: Mode to convert
3548 * Convert a regulator mode into a status.
3550 int regulator_mode_to_status(unsigned int mode
)
3553 case REGULATOR_MODE_FAST
:
3554 return REGULATOR_STATUS_FAST
;
3555 case REGULATOR_MODE_NORMAL
:
3556 return REGULATOR_STATUS_NORMAL
;
3557 case REGULATOR_MODE_IDLE
:
3558 return REGULATOR_STATUS_IDLE
;
3559 case REGULATOR_MODE_STANDBY
:
3560 return REGULATOR_STATUS_STANDBY
;
3562 return REGULATOR_STATUS_UNDEFINED
;
3565 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3567 static struct attribute
*regulator_dev_attrs
[] = {
3568 &dev_attr_name
.attr
,
3569 &dev_attr_num_users
.attr
,
3570 &dev_attr_type
.attr
,
3571 &dev_attr_microvolts
.attr
,
3572 &dev_attr_microamps
.attr
,
3573 &dev_attr_opmode
.attr
,
3574 &dev_attr_state
.attr
,
3575 &dev_attr_status
.attr
,
3576 &dev_attr_bypass
.attr
,
3577 &dev_attr_requested_microamps
.attr
,
3578 &dev_attr_min_microvolts
.attr
,
3579 &dev_attr_max_microvolts
.attr
,
3580 &dev_attr_min_microamps
.attr
,
3581 &dev_attr_max_microamps
.attr
,
3582 &dev_attr_suspend_standby_state
.attr
,
3583 &dev_attr_suspend_mem_state
.attr
,
3584 &dev_attr_suspend_disk_state
.attr
,
3585 &dev_attr_suspend_standby_microvolts
.attr
,
3586 &dev_attr_suspend_mem_microvolts
.attr
,
3587 &dev_attr_suspend_disk_microvolts
.attr
,
3588 &dev_attr_suspend_standby_mode
.attr
,
3589 &dev_attr_suspend_mem_mode
.attr
,
3590 &dev_attr_suspend_disk_mode
.attr
,
3595 * To avoid cluttering sysfs (and memory) with useless state, only
3596 * create attributes that can be meaningfully displayed.
3598 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
3599 struct attribute
*attr
, int idx
)
3601 struct device
*dev
= kobj_to_dev(kobj
);
3602 struct regulator_dev
*rdev
= container_of(dev
, struct regulator_dev
, dev
);
3603 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3604 umode_t mode
= attr
->mode
;
3606 /* these three are always present */
3607 if (attr
== &dev_attr_name
.attr
||
3608 attr
== &dev_attr_num_users
.attr
||
3609 attr
== &dev_attr_type
.attr
)
3612 /* some attributes need specific methods to be displayed */
3613 if (attr
== &dev_attr_microvolts
.attr
) {
3614 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3615 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3616 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3617 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
3622 if (attr
== &dev_attr_microamps
.attr
)
3623 return ops
->get_current_limit
? mode
: 0;
3625 if (attr
== &dev_attr_opmode
.attr
)
3626 return ops
->get_mode
? mode
: 0;
3628 if (attr
== &dev_attr_state
.attr
)
3629 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
3631 if (attr
== &dev_attr_status
.attr
)
3632 return ops
->get_status
? mode
: 0;
3634 if (attr
== &dev_attr_bypass
.attr
)
3635 return ops
->get_bypass
? mode
: 0;
3637 /* some attributes are type-specific */
3638 if (attr
== &dev_attr_requested_microamps
.attr
)
3639 return rdev
->desc
->type
== REGULATOR_CURRENT
? mode
: 0;
3641 /* constraints need specific supporting methods */
3642 if (attr
== &dev_attr_min_microvolts
.attr
||
3643 attr
== &dev_attr_max_microvolts
.attr
)
3644 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
3646 if (attr
== &dev_attr_min_microamps
.attr
||
3647 attr
== &dev_attr_max_microamps
.attr
)
3648 return ops
->set_current_limit
? mode
: 0;
3650 if (attr
== &dev_attr_suspend_standby_state
.attr
||
3651 attr
== &dev_attr_suspend_mem_state
.attr
||
3652 attr
== &dev_attr_suspend_disk_state
.attr
)
3655 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
3656 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
3657 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
3658 return ops
->set_suspend_voltage
? mode
: 0;
3660 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
3661 attr
== &dev_attr_suspend_mem_mode
.attr
||
3662 attr
== &dev_attr_suspend_disk_mode
.attr
)
3663 return ops
->set_suspend_mode
? mode
: 0;
3668 static const struct attribute_group regulator_dev_group
= {
3669 .attrs
= regulator_dev_attrs
,
3670 .is_visible
= regulator_attr_is_visible
,
3673 static const struct attribute_group
*regulator_dev_groups
[] = {
3674 ®ulator_dev_group
,
3678 static void regulator_dev_release(struct device
*dev
)
3680 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
3682 kfree(rdev
->constraints
);
3683 of_node_put(rdev
->dev
.of_node
);
3687 static struct class regulator_class
= {
3688 .name
= "regulator",
3689 .dev_release
= regulator_dev_release
,
3690 .dev_groups
= regulator_dev_groups
,
3693 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3695 struct device
*parent
= rdev
->dev
.parent
;
3696 const char *rname
= rdev_get_name(rdev
);
3697 char name
[NAME_MAX
];
3699 /* Avoid duplicate debugfs directory names */
3700 if (parent
&& rname
== rdev
->desc
->name
) {
3701 snprintf(name
, sizeof(name
), "%s-%s", dev_name(parent
),
3706 rdev
->debugfs
= debugfs_create_dir(rname
, debugfs_root
);
3707 if (!rdev
->debugfs
) {
3708 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3712 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3714 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3716 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3717 &rdev
->bypass_count
);
3721 * regulator_register - register regulator
3722 * @regulator_desc: regulator to register
3723 * @cfg: runtime configuration for regulator
3725 * Called by regulator drivers to register a regulator.
3726 * Returns a valid pointer to struct regulator_dev on success
3727 * or an ERR_PTR() on error.
3729 struct regulator_dev
*
3730 regulator_register(const struct regulator_desc
*regulator_desc
,
3731 const struct regulator_config
*cfg
)
3733 const struct regulation_constraints
*constraints
= NULL
;
3734 const struct regulator_init_data
*init_data
;
3735 struct regulator_config
*config
= NULL
;
3736 static atomic_t regulator_no
= ATOMIC_INIT(-1);
3737 struct regulator_dev
*rdev
;
3741 if (regulator_desc
== NULL
|| cfg
== NULL
)
3742 return ERR_PTR(-EINVAL
);
3747 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3748 return ERR_PTR(-EINVAL
);
3750 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3751 regulator_desc
->type
!= REGULATOR_CURRENT
)
3752 return ERR_PTR(-EINVAL
);
3754 /* Only one of each should be implemented */
3755 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3756 regulator_desc
->ops
->get_voltage_sel
);
3757 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3758 regulator_desc
->ops
->set_voltage_sel
);
3760 /* If we're using selectors we must implement list_voltage. */
3761 if (regulator_desc
->ops
->get_voltage_sel
&&
3762 !regulator_desc
->ops
->list_voltage
) {
3763 return ERR_PTR(-EINVAL
);
3765 if (regulator_desc
->ops
->set_voltage_sel
&&
3766 !regulator_desc
->ops
->list_voltage
) {
3767 return ERR_PTR(-EINVAL
);
3770 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3772 return ERR_PTR(-ENOMEM
);
3775 * Duplicate the config so the driver could override it after
3776 * parsing init data.
3778 config
= kmemdup(cfg
, sizeof(*cfg
), GFP_KERNEL
);
3779 if (config
== NULL
) {
3781 return ERR_PTR(-ENOMEM
);
3784 init_data
= regulator_of_get_init_data(dev
, regulator_desc
, config
,
3785 &rdev
->dev
.of_node
);
3787 init_data
= config
->init_data
;
3788 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
3791 mutex_lock(®ulator_list_mutex
);
3793 mutex_init(&rdev
->mutex
);
3794 rdev
->reg_data
= config
->driver_data
;
3795 rdev
->owner
= regulator_desc
->owner
;
3796 rdev
->desc
= regulator_desc
;
3798 rdev
->regmap
= config
->regmap
;
3799 else if (dev_get_regmap(dev
, NULL
))
3800 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3801 else if (dev
->parent
)
3802 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3803 INIT_LIST_HEAD(&rdev
->consumer_list
);
3804 INIT_LIST_HEAD(&rdev
->list
);
3805 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3806 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3808 /* preform any regulator specific init */
3809 if (init_data
&& init_data
->regulator_init
) {
3810 ret
= init_data
->regulator_init(rdev
->reg_data
);
3815 /* register with sysfs */
3816 rdev
->dev
.class = ®ulator_class
;
3817 rdev
->dev
.parent
= dev
;
3818 dev_set_name(&rdev
->dev
, "regulator.%lu",
3819 (unsigned long) atomic_inc_return(®ulator_no
));
3820 ret
= device_register(&rdev
->dev
);
3822 put_device(&rdev
->dev
);
3826 dev_set_drvdata(&rdev
->dev
, rdev
);
3828 if ((config
->ena_gpio
|| config
->ena_gpio_initialized
) &&
3829 gpio_is_valid(config
->ena_gpio
)) {
3830 ret
= regulator_ena_gpio_request(rdev
, config
);
3832 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3833 config
->ena_gpio
, ret
);
3838 /* set regulator constraints */
3840 constraints
= &init_data
->constraints
;
3842 ret
= set_machine_constraints(rdev
, constraints
);
3846 if (init_data
&& init_data
->supply_regulator
)
3847 rdev
->supply_name
= init_data
->supply_regulator
;
3848 else if (regulator_desc
->supply_name
)
3849 rdev
->supply_name
= regulator_desc
->supply_name
;
3851 /* add consumers devices */
3853 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3854 ret
= set_consumer_device_supply(rdev
,
3855 init_data
->consumer_supplies
[i
].dev_name
,
3856 init_data
->consumer_supplies
[i
].supply
);
3858 dev_err(dev
, "Failed to set supply %s\n",
3859 init_data
->consumer_supplies
[i
].supply
);
3860 goto unset_supplies
;
3865 rdev_init_debugfs(rdev
);
3867 mutex_unlock(®ulator_list_mutex
);
3872 unset_regulator_supplies(rdev
);
3875 regulator_ena_gpio_free(rdev
);
3876 kfree(rdev
->constraints
);
3878 device_unregister(&rdev
->dev
);
3879 /* device core frees rdev */
3880 rdev
= ERR_PTR(ret
);
3885 rdev
= ERR_PTR(ret
);
3888 EXPORT_SYMBOL_GPL(regulator_register
);
3891 * regulator_unregister - unregister regulator
3892 * @rdev: regulator to unregister
3894 * Called by regulator drivers to unregister a regulator.
3896 void regulator_unregister(struct regulator_dev
*rdev
)
3902 while (rdev
->use_count
--)
3903 regulator_disable(rdev
->supply
);
3904 regulator_put(rdev
->supply
);
3906 mutex_lock(®ulator_list_mutex
);
3907 debugfs_remove_recursive(rdev
->debugfs
);
3908 flush_work(&rdev
->disable_work
.work
);
3909 WARN_ON(rdev
->open_count
);
3910 unset_regulator_supplies(rdev
);
3911 list_del(&rdev
->list
);
3912 mutex_unlock(®ulator_list_mutex
);
3913 regulator_ena_gpio_free(rdev
);
3914 device_unregister(&rdev
->dev
);
3916 EXPORT_SYMBOL_GPL(regulator_unregister
);
3918 static int _regulator_suspend_prepare(struct device
*dev
, void *data
)
3920 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
3921 const suspend_state_t
*state
= data
;
3924 mutex_lock(&rdev
->mutex
);
3925 ret
= suspend_prepare(rdev
, *state
);
3926 mutex_unlock(&rdev
->mutex
);
3932 * regulator_suspend_prepare - prepare regulators for system wide suspend
3933 * @state: system suspend state
3935 * Configure each regulator with it's suspend operating parameters for state.
3936 * This will usually be called by machine suspend code prior to supending.
3938 int regulator_suspend_prepare(suspend_state_t state
)
3940 /* ON is handled by regulator active state */
3941 if (state
== PM_SUSPEND_ON
)
3944 return class_for_each_device(®ulator_class
, NULL
, &state
,
3945 _regulator_suspend_prepare
);
3947 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3949 static int _regulator_suspend_finish(struct device
*dev
, void *data
)
3951 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
3954 mutex_lock(&rdev
->mutex
);
3955 if (rdev
->use_count
> 0 || rdev
->constraints
->always_on
) {
3956 if (!_regulator_is_enabled(rdev
)) {
3957 ret
= _regulator_do_enable(rdev
);
3960 "Failed to resume regulator %d\n",
3964 if (!have_full_constraints())
3966 if (!_regulator_is_enabled(rdev
))
3969 ret
= _regulator_do_disable(rdev
);
3971 dev_err(dev
, "Failed to suspend regulator %d\n", ret
);
3974 mutex_unlock(&rdev
->mutex
);
3976 /* Keep processing regulators in spite of any errors */
3981 * regulator_suspend_finish - resume regulators from system wide suspend
3983 * Turn on regulators that might be turned off by regulator_suspend_prepare
3984 * and that should be turned on according to the regulators properties.
3986 int regulator_suspend_finish(void)
3988 return class_for_each_device(®ulator_class
, NULL
, NULL
,
3989 _regulator_suspend_finish
);
3991 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3994 * regulator_has_full_constraints - the system has fully specified constraints
3996 * Calling this function will cause the regulator API to disable all
3997 * regulators which have a zero use count and don't have an always_on
3998 * constraint in a late_initcall.
4000 * The intention is that this will become the default behaviour in a
4001 * future kernel release so users are encouraged to use this facility
4004 void regulator_has_full_constraints(void)
4006 has_full_constraints
= 1;
4008 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
4011 * rdev_get_drvdata - get rdev regulator driver data
4014 * Get rdev regulator driver private data. This call can be used in the
4015 * regulator driver context.
4017 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
4019 return rdev
->reg_data
;
4021 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
4024 * regulator_get_drvdata - get regulator driver data
4025 * @regulator: regulator
4027 * Get regulator driver private data. This call can be used in the consumer
4028 * driver context when non API regulator specific functions need to be called.
4030 void *regulator_get_drvdata(struct regulator
*regulator
)
4032 return regulator
->rdev
->reg_data
;
4034 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
4037 * regulator_set_drvdata - set regulator driver data
4038 * @regulator: regulator
4041 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
4043 regulator
->rdev
->reg_data
= data
;
4045 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
4048 * regulator_get_id - get regulator ID
4051 int rdev_get_id(struct regulator_dev
*rdev
)
4053 return rdev
->desc
->id
;
4055 EXPORT_SYMBOL_GPL(rdev_get_id
);
4057 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
4061 EXPORT_SYMBOL_GPL(rdev_get_dev
);
4063 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
4065 return reg_init_data
->driver_data
;
4067 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
4069 #ifdef CONFIG_DEBUG_FS
4070 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
4071 size_t count
, loff_t
*ppos
)
4073 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
4074 ssize_t len
, ret
= 0;
4075 struct regulator_map
*map
;
4080 list_for_each_entry(map
, ®ulator_map_list
, list
) {
4081 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
4083 rdev_get_name(map
->regulator
), map
->dev_name
,
4087 if (ret
> PAGE_SIZE
) {
4093 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
4101 static const struct file_operations supply_map_fops
= {
4102 #ifdef CONFIG_DEBUG_FS
4103 .read
= supply_map_read_file
,
4104 .llseek
= default_llseek
,
4108 #ifdef CONFIG_DEBUG_FS
4109 struct summary_data
{
4111 struct regulator_dev
*parent
;
4115 static void regulator_summary_show_subtree(struct seq_file
*s
,
4116 struct regulator_dev
*rdev
,
4119 static int regulator_summary_show_children(struct device
*dev
, void *data
)
4121 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4122 struct summary_data
*summary_data
= data
;
4124 if (rdev
->supply
&& rdev
->supply
->rdev
== summary_data
->parent
)
4125 regulator_summary_show_subtree(summary_data
->s
, rdev
,
4126 summary_data
->level
+ 1);
4131 static void regulator_summary_show_subtree(struct seq_file
*s
,
4132 struct regulator_dev
*rdev
,
4135 struct regulation_constraints
*c
;
4136 struct regulator
*consumer
;
4137 struct summary_data summary_data
;
4142 seq_printf(s
, "%*s%-*s %3d %4d %6d ",
4144 30 - level
* 3, rdev_get_name(rdev
),
4145 rdev
->use_count
, rdev
->open_count
, rdev
->bypass_count
);
4147 seq_printf(s
, "%5dmV ", _regulator_get_voltage(rdev
) / 1000);
4148 seq_printf(s
, "%5dmA ", _regulator_get_current_limit(rdev
) / 1000);
4150 c
= rdev
->constraints
;
4152 switch (rdev
->desc
->type
) {
4153 case REGULATOR_VOLTAGE
:
4154 seq_printf(s
, "%5dmV %5dmV ",
4155 c
->min_uV
/ 1000, c
->max_uV
/ 1000);
4157 case REGULATOR_CURRENT
:
4158 seq_printf(s
, "%5dmA %5dmA ",
4159 c
->min_uA
/ 1000, c
->max_uA
/ 1000);
4166 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
) {
4167 if (consumer
->dev
->class == ®ulator_class
)
4170 seq_printf(s
, "%*s%-*s ",
4171 (level
+ 1) * 3 + 1, "",
4172 30 - (level
+ 1) * 3, dev_name(consumer
->dev
));
4174 switch (rdev
->desc
->type
) {
4175 case REGULATOR_VOLTAGE
:
4176 seq_printf(s
, "%37dmV %5dmV",
4177 consumer
->min_uV
/ 1000,
4178 consumer
->max_uV
/ 1000);
4180 case REGULATOR_CURRENT
:
4188 summary_data
.level
= level
;
4189 summary_data
.parent
= rdev
;
4191 class_for_each_device(®ulator_class
, NULL
, &summary_data
,
4192 regulator_summary_show_children
);
4195 static int regulator_summary_show_roots(struct device
*dev
, void *data
)
4197 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4198 struct seq_file
*s
= data
;
4201 regulator_summary_show_subtree(s
, rdev
, 0);
4206 static int regulator_summary_show(struct seq_file
*s
, void *data
)
4208 seq_puts(s
, " regulator use open bypass voltage current min max\n");
4209 seq_puts(s
, "-------------------------------------------------------------------------------\n");
4211 class_for_each_device(®ulator_class
, NULL
, s
,
4212 regulator_summary_show_roots
);
4217 static int regulator_summary_open(struct inode
*inode
, struct file
*file
)
4219 return single_open(file
, regulator_summary_show
, inode
->i_private
);
4223 static const struct file_operations regulator_summary_fops
= {
4224 #ifdef CONFIG_DEBUG_FS
4225 .open
= regulator_summary_open
,
4227 .llseek
= seq_lseek
,
4228 .release
= single_release
,
4232 static int __init
regulator_init(void)
4236 ret
= class_register(®ulator_class
);
4238 debugfs_root
= debugfs_create_dir("regulator", NULL
);
4240 pr_warn("regulator: Failed to create debugfs directory\n");
4242 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
4245 debugfs_create_file("regulator_summary", 0444, debugfs_root
,
4246 NULL
, ®ulator_summary_fops
);
4248 regulator_dummy_init();
4253 /* init early to allow our consumers to complete system booting */
4254 core_initcall(regulator_init
);
4256 static int __init
regulator_late_cleanup(struct device
*dev
, void *data
)
4258 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4259 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
4260 struct regulation_constraints
*c
= rdev
->constraints
;
4263 if (c
&& c
->always_on
)
4266 if (c
&& !(c
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
))
4269 mutex_lock(&rdev
->mutex
);
4271 if (rdev
->use_count
)
4274 /* If we can't read the status assume it's on. */
4275 if (ops
->is_enabled
)
4276 enabled
= ops
->is_enabled(rdev
);
4283 if (have_full_constraints()) {
4284 /* We log since this may kill the system if it goes
4286 rdev_info(rdev
, "disabling\n");
4287 ret
= _regulator_do_disable(rdev
);
4289 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4291 /* The intention is that in future we will
4292 * assume that full constraints are provided
4293 * so warn even if we aren't going to do
4296 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4300 mutex_unlock(&rdev
->mutex
);
4305 static int __init
regulator_init_complete(void)
4308 * Since DT doesn't provide an idiomatic mechanism for
4309 * enabling full constraints and since it's much more natural
4310 * with DT to provide them just assume that a DT enabled
4311 * system has full constraints.
4313 if (of_have_populated_dt())
4314 has_full_constraints
= true;
4316 /* If we have a full configuration then disable any regulators
4317 * we have permission to change the status for and which are
4318 * not in use or always_on. This is effectively the default
4319 * for DT and ACPI as they have full constraints.
4321 class_for_each_device(®ulator_class
, NULL
, NULL
,
4322 regulator_late_cleanup
);
4326 late_initcall_sync(regulator_init_complete
);