2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
27 #include <linux/gpio/consumer.h>
29 #include <linux/regmap.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/module.h>
36 #define CREATE_TRACE_POINTS
37 #include <trace/events/regulator.h>
42 #define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 #define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
53 static DEFINE_MUTEX(regulator_list_mutex
);
54 static LIST_HEAD(regulator_map_list
);
55 static LIST_HEAD(regulator_ena_gpio_list
);
56 static LIST_HEAD(regulator_supply_alias_list
);
57 static bool has_full_constraints
;
59 static struct dentry
*debugfs_root
;
61 static struct class regulator_class
;
64 * struct regulator_map
66 * Used to provide symbolic supply names to devices.
68 struct regulator_map
{
69 struct list_head list
;
70 const char *dev_name
; /* The dev_name() for the consumer */
72 struct regulator_dev
*regulator
;
76 * struct regulator_enable_gpio
78 * Management for shared enable GPIO pin
80 struct regulator_enable_gpio
{
81 struct list_head list
;
82 struct gpio_desc
*gpiod
;
83 u32 enable_count
; /* a number of enabled shared GPIO */
84 u32 request_count
; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert
:1;
89 * struct regulator_supply_alias
91 * Used to map lookups for a supply onto an alternative device.
93 struct regulator_supply_alias
{
94 struct list_head list
;
95 struct device
*src_dev
;
96 const char *src_supply
;
97 struct device
*alias_dev
;
98 const char *alias_supply
;
101 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
102 static int _regulator_disable(struct regulator_dev
*rdev
);
103 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
104 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
105 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
106 static int _notifier_call_chain(struct regulator_dev
*rdev
,
107 unsigned long event
, void *data
);
108 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
109 int min_uV
, int max_uV
);
110 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
112 const char *supply_name
);
113 static void _regulator_put(struct regulator
*regulator
);
115 static struct regulator_dev
*dev_to_rdev(struct device
*dev
)
117 return container_of(dev
, struct regulator_dev
, dev
);
120 static const char *rdev_get_name(struct regulator_dev
*rdev
)
122 if (rdev
->constraints
&& rdev
->constraints
->name
)
123 return rdev
->constraints
->name
;
124 else if (rdev
->desc
->name
)
125 return rdev
->desc
->name
;
130 static bool have_full_constraints(void)
132 return has_full_constraints
|| of_have_populated_dt();
135 static bool regulator_ops_is_valid(struct regulator_dev
*rdev
, int ops
)
137 if (!rdev
->constraints
) {
138 rdev_err(rdev
, "no constraints\n");
142 if (rdev
->constraints
->valid_ops_mask
& ops
)
148 static inline struct regulator_dev
*rdev_get_supply(struct regulator_dev
*rdev
)
150 if (rdev
&& rdev
->supply
)
151 return rdev
->supply
->rdev
;
157 * regulator_lock_supply - lock a regulator and its supplies
158 * @rdev: regulator source
160 static void regulator_lock_supply(struct regulator_dev
*rdev
)
164 for (i
= 0; rdev
; rdev
= rdev_get_supply(rdev
), i
++)
165 mutex_lock_nested(&rdev
->mutex
, i
);
169 * regulator_unlock_supply - unlock a regulator and its supplies
170 * @rdev: regulator source
172 static void regulator_unlock_supply(struct regulator_dev
*rdev
)
174 struct regulator
*supply
;
177 mutex_unlock(&rdev
->mutex
);
178 supply
= rdev
->supply
;
188 * of_get_regulator - get a regulator device node based on supply name
189 * @dev: Device pointer for the consumer (of regulator) device
190 * @supply: regulator supply name
192 * Extract the regulator device node corresponding to the supply name.
193 * returns the device node corresponding to the regulator if found, else
196 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
198 struct device_node
*regnode
= NULL
;
199 char prop_name
[32]; /* 32 is max size of property name */
201 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
203 snprintf(prop_name
, 32, "%s-supply", supply
);
204 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
207 dev_dbg(dev
, "Looking up %s property in node %s failed",
208 prop_name
, dev
->of_node
->full_name
);
214 /* Platform voltage constraint check */
215 static int regulator_check_voltage(struct regulator_dev
*rdev
,
216 int *min_uV
, int *max_uV
)
218 BUG_ON(*min_uV
> *max_uV
);
220 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
221 rdev_err(rdev
, "voltage operation not allowed\n");
225 if (*max_uV
> rdev
->constraints
->max_uV
)
226 *max_uV
= rdev
->constraints
->max_uV
;
227 if (*min_uV
< rdev
->constraints
->min_uV
)
228 *min_uV
= rdev
->constraints
->min_uV
;
230 if (*min_uV
> *max_uV
) {
231 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
239 /* Make sure we select a voltage that suits the needs of all
240 * regulator consumers
242 static int regulator_check_consumers(struct regulator_dev
*rdev
,
243 int *min_uV
, int *max_uV
)
245 struct regulator
*regulator
;
247 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
249 * Assume consumers that didn't say anything are OK
250 * with anything in the constraint range.
252 if (!regulator
->min_uV
&& !regulator
->max_uV
)
255 if (*max_uV
> regulator
->max_uV
)
256 *max_uV
= regulator
->max_uV
;
257 if (*min_uV
< regulator
->min_uV
)
258 *min_uV
= regulator
->min_uV
;
261 if (*min_uV
> *max_uV
) {
262 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
270 /* current constraint check */
271 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
272 int *min_uA
, int *max_uA
)
274 BUG_ON(*min_uA
> *max_uA
);
276 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_CURRENT
)) {
277 rdev_err(rdev
, "current operation not allowed\n");
281 if (*max_uA
> rdev
->constraints
->max_uA
)
282 *max_uA
= rdev
->constraints
->max_uA
;
283 if (*min_uA
< rdev
->constraints
->min_uA
)
284 *min_uA
= rdev
->constraints
->min_uA
;
286 if (*min_uA
> *max_uA
) {
287 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
295 /* operating mode constraint check */
296 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
299 case REGULATOR_MODE_FAST
:
300 case REGULATOR_MODE_NORMAL
:
301 case REGULATOR_MODE_IDLE
:
302 case REGULATOR_MODE_STANDBY
:
305 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
309 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_MODE
)) {
310 rdev_err(rdev
, "mode operation not allowed\n");
314 /* The modes are bitmasks, the most power hungry modes having
315 * the lowest values. If the requested mode isn't supported
316 * try higher modes. */
318 if (rdev
->constraints
->valid_modes_mask
& *mode
)
326 static ssize_t
regulator_uV_show(struct device
*dev
,
327 struct device_attribute
*attr
, char *buf
)
329 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
332 mutex_lock(&rdev
->mutex
);
333 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
334 mutex_unlock(&rdev
->mutex
);
338 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
340 static ssize_t
regulator_uA_show(struct device
*dev
,
341 struct device_attribute
*attr
, char *buf
)
343 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
345 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
347 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
349 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
352 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
354 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
356 static DEVICE_ATTR_RO(name
);
358 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
361 case REGULATOR_MODE_FAST
:
362 return sprintf(buf
, "fast\n");
363 case REGULATOR_MODE_NORMAL
:
364 return sprintf(buf
, "normal\n");
365 case REGULATOR_MODE_IDLE
:
366 return sprintf(buf
, "idle\n");
367 case REGULATOR_MODE_STANDBY
:
368 return sprintf(buf
, "standby\n");
370 return sprintf(buf
, "unknown\n");
373 static ssize_t
regulator_opmode_show(struct device
*dev
,
374 struct device_attribute
*attr
, char *buf
)
376 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
378 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
380 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
382 static ssize_t
regulator_print_state(char *buf
, int state
)
385 return sprintf(buf
, "enabled\n");
387 return sprintf(buf
, "disabled\n");
389 return sprintf(buf
, "unknown\n");
392 static ssize_t
regulator_state_show(struct device
*dev
,
393 struct device_attribute
*attr
, char *buf
)
395 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
398 mutex_lock(&rdev
->mutex
);
399 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
400 mutex_unlock(&rdev
->mutex
);
404 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
406 static ssize_t
regulator_status_show(struct device
*dev
,
407 struct device_attribute
*attr
, char *buf
)
409 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
413 status
= rdev
->desc
->ops
->get_status(rdev
);
418 case REGULATOR_STATUS_OFF
:
421 case REGULATOR_STATUS_ON
:
424 case REGULATOR_STATUS_ERROR
:
427 case REGULATOR_STATUS_FAST
:
430 case REGULATOR_STATUS_NORMAL
:
433 case REGULATOR_STATUS_IDLE
:
436 case REGULATOR_STATUS_STANDBY
:
439 case REGULATOR_STATUS_BYPASS
:
442 case REGULATOR_STATUS_UNDEFINED
:
449 return sprintf(buf
, "%s\n", label
);
451 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
453 static ssize_t
regulator_min_uA_show(struct device
*dev
,
454 struct device_attribute
*attr
, char *buf
)
456 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
458 if (!rdev
->constraints
)
459 return sprintf(buf
, "constraint not defined\n");
461 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
463 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
465 static ssize_t
regulator_max_uA_show(struct device
*dev
,
466 struct device_attribute
*attr
, char *buf
)
468 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
470 if (!rdev
->constraints
)
471 return sprintf(buf
, "constraint not defined\n");
473 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
475 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
477 static ssize_t
regulator_min_uV_show(struct device
*dev
,
478 struct device_attribute
*attr
, char *buf
)
480 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
482 if (!rdev
->constraints
)
483 return sprintf(buf
, "constraint not defined\n");
485 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
487 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
489 static ssize_t
regulator_max_uV_show(struct device
*dev
,
490 struct device_attribute
*attr
, char *buf
)
492 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
494 if (!rdev
->constraints
)
495 return sprintf(buf
, "constraint not defined\n");
497 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
499 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
501 static ssize_t
regulator_total_uA_show(struct device
*dev
,
502 struct device_attribute
*attr
, char *buf
)
504 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
505 struct regulator
*regulator
;
508 mutex_lock(&rdev
->mutex
);
509 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
510 uA
+= regulator
->uA_load
;
511 mutex_unlock(&rdev
->mutex
);
512 return sprintf(buf
, "%d\n", uA
);
514 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
516 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
519 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
520 return sprintf(buf
, "%d\n", rdev
->use_count
);
522 static DEVICE_ATTR_RO(num_users
);
524 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
527 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
529 switch (rdev
->desc
->type
) {
530 case REGULATOR_VOLTAGE
:
531 return sprintf(buf
, "voltage\n");
532 case REGULATOR_CURRENT
:
533 return sprintf(buf
, "current\n");
535 return sprintf(buf
, "unknown\n");
537 static DEVICE_ATTR_RO(type
);
539 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
540 struct device_attribute
*attr
, char *buf
)
542 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
544 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
546 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
547 regulator_suspend_mem_uV_show
, NULL
);
549 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
550 struct device_attribute
*attr
, char *buf
)
552 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
554 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
556 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
557 regulator_suspend_disk_uV_show
, NULL
);
559 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
560 struct device_attribute
*attr
, char *buf
)
562 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
564 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
566 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
567 regulator_suspend_standby_uV_show
, NULL
);
569 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
570 struct device_attribute
*attr
, char *buf
)
572 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
574 return regulator_print_opmode(buf
,
575 rdev
->constraints
->state_mem
.mode
);
577 static DEVICE_ATTR(suspend_mem_mode
, 0444,
578 regulator_suspend_mem_mode_show
, NULL
);
580 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
581 struct device_attribute
*attr
, char *buf
)
583 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
585 return regulator_print_opmode(buf
,
586 rdev
->constraints
->state_disk
.mode
);
588 static DEVICE_ATTR(suspend_disk_mode
, 0444,
589 regulator_suspend_disk_mode_show
, NULL
);
591 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
592 struct device_attribute
*attr
, char *buf
)
594 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
596 return regulator_print_opmode(buf
,
597 rdev
->constraints
->state_standby
.mode
);
599 static DEVICE_ATTR(suspend_standby_mode
, 0444,
600 regulator_suspend_standby_mode_show
, NULL
);
602 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
603 struct device_attribute
*attr
, char *buf
)
605 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
607 return regulator_print_state(buf
,
608 rdev
->constraints
->state_mem
.enabled
);
610 static DEVICE_ATTR(suspend_mem_state
, 0444,
611 regulator_suspend_mem_state_show
, NULL
);
613 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
614 struct device_attribute
*attr
, char *buf
)
616 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
618 return regulator_print_state(buf
,
619 rdev
->constraints
->state_disk
.enabled
);
621 static DEVICE_ATTR(suspend_disk_state
, 0444,
622 regulator_suspend_disk_state_show
, NULL
);
624 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
625 struct device_attribute
*attr
, char *buf
)
627 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
629 return regulator_print_state(buf
,
630 rdev
->constraints
->state_standby
.enabled
);
632 static DEVICE_ATTR(suspend_standby_state
, 0444,
633 regulator_suspend_standby_state_show
, NULL
);
635 static ssize_t
regulator_bypass_show(struct device
*dev
,
636 struct device_attribute
*attr
, char *buf
)
638 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
643 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
652 return sprintf(buf
, "%s\n", report
);
654 static DEVICE_ATTR(bypass
, 0444,
655 regulator_bypass_show
, NULL
);
657 /* Calculate the new optimum regulator operating mode based on the new total
658 * consumer load. All locks held by caller */
659 static int drms_uA_update(struct regulator_dev
*rdev
)
661 struct regulator
*sibling
;
662 int current_uA
= 0, output_uV
, input_uV
, err
;
665 lockdep_assert_held_once(&rdev
->mutex
);
668 * first check to see if we can set modes at all, otherwise just
669 * tell the consumer everything is OK.
671 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_DRMS
))
674 if (!rdev
->desc
->ops
->get_optimum_mode
&&
675 !rdev
->desc
->ops
->set_load
)
678 if (!rdev
->desc
->ops
->set_mode
&&
679 !rdev
->desc
->ops
->set_load
)
682 /* get output voltage */
683 output_uV
= _regulator_get_voltage(rdev
);
684 if (output_uV
<= 0) {
685 rdev_err(rdev
, "invalid output voltage found\n");
689 /* get input voltage */
692 input_uV
= regulator_get_voltage(rdev
->supply
);
694 input_uV
= rdev
->constraints
->input_uV
;
696 rdev_err(rdev
, "invalid input voltage found\n");
700 /* calc total requested load */
701 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
702 current_uA
+= sibling
->uA_load
;
704 current_uA
+= rdev
->constraints
->system_load
;
706 if (rdev
->desc
->ops
->set_load
) {
707 /* set the optimum mode for our new total regulator load */
708 err
= rdev
->desc
->ops
->set_load(rdev
, current_uA
);
710 rdev_err(rdev
, "failed to set load %d\n", current_uA
);
712 /* now get the optimum mode for our new total regulator load */
713 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
714 output_uV
, current_uA
);
716 /* check the new mode is allowed */
717 err
= regulator_mode_constrain(rdev
, &mode
);
719 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
720 current_uA
, input_uV
, output_uV
);
724 err
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
726 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
732 static int suspend_set_state(struct regulator_dev
*rdev
,
733 struct regulator_state
*rstate
)
737 /* If we have no suspend mode configration don't set anything;
738 * only warn if the driver implements set_suspend_voltage or
739 * set_suspend_mode callback.
741 if (!rstate
->enabled
&& !rstate
->disabled
) {
742 if (rdev
->desc
->ops
->set_suspend_voltage
||
743 rdev
->desc
->ops
->set_suspend_mode
)
744 rdev_warn(rdev
, "No configuration\n");
748 if (rstate
->enabled
&& rstate
->disabled
) {
749 rdev_err(rdev
, "invalid configuration\n");
753 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
754 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
755 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
756 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
757 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
761 rdev_err(rdev
, "failed to enabled/disable\n");
765 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
766 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
768 rdev_err(rdev
, "failed to set voltage\n");
773 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
774 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
776 rdev_err(rdev
, "failed to set mode\n");
783 /* locks held by caller */
784 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
786 lockdep_assert_held_once(&rdev
->mutex
);
788 if (!rdev
->constraints
)
792 case PM_SUSPEND_STANDBY
:
793 return suspend_set_state(rdev
,
794 &rdev
->constraints
->state_standby
);
796 return suspend_set_state(rdev
,
797 &rdev
->constraints
->state_mem
);
799 return suspend_set_state(rdev
,
800 &rdev
->constraints
->state_disk
);
806 static void print_constraints(struct regulator_dev
*rdev
)
808 struct regulation_constraints
*constraints
= rdev
->constraints
;
810 size_t len
= sizeof(buf
) - 1;
814 if (constraints
->min_uV
&& constraints
->max_uV
) {
815 if (constraints
->min_uV
== constraints
->max_uV
)
816 count
+= scnprintf(buf
+ count
, len
- count
, "%d mV ",
817 constraints
->min_uV
/ 1000);
819 count
+= scnprintf(buf
+ count
, len
- count
,
821 constraints
->min_uV
/ 1000,
822 constraints
->max_uV
/ 1000);
825 if (!constraints
->min_uV
||
826 constraints
->min_uV
!= constraints
->max_uV
) {
827 ret
= _regulator_get_voltage(rdev
);
829 count
+= scnprintf(buf
+ count
, len
- count
,
830 "at %d mV ", ret
/ 1000);
833 if (constraints
->uV_offset
)
834 count
+= scnprintf(buf
+ count
, len
- count
, "%dmV offset ",
835 constraints
->uV_offset
/ 1000);
837 if (constraints
->min_uA
&& constraints
->max_uA
) {
838 if (constraints
->min_uA
== constraints
->max_uA
)
839 count
+= scnprintf(buf
+ count
, len
- count
, "%d mA ",
840 constraints
->min_uA
/ 1000);
842 count
+= scnprintf(buf
+ count
, len
- count
,
844 constraints
->min_uA
/ 1000,
845 constraints
->max_uA
/ 1000);
848 if (!constraints
->min_uA
||
849 constraints
->min_uA
!= constraints
->max_uA
) {
850 ret
= _regulator_get_current_limit(rdev
);
852 count
+= scnprintf(buf
+ count
, len
- count
,
853 "at %d mA ", ret
/ 1000);
856 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
857 count
+= scnprintf(buf
+ count
, len
- count
, "fast ");
858 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
859 count
+= scnprintf(buf
+ count
, len
- count
, "normal ");
860 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
861 count
+= scnprintf(buf
+ count
, len
- count
, "idle ");
862 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
863 count
+= scnprintf(buf
+ count
, len
- count
, "standby");
866 scnprintf(buf
, len
, "no parameters");
868 rdev_dbg(rdev
, "%s\n", buf
);
870 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
871 !regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
))
873 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
876 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
877 struct regulation_constraints
*constraints
)
879 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
882 /* do we need to apply the constraint voltage */
883 if (rdev
->constraints
->apply_uV
&&
884 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
) {
885 int target_min
, target_max
;
886 int current_uV
= _regulator_get_voltage(rdev
);
887 if (current_uV
< 0) {
889 "failed to get the current voltage(%d)\n",
895 * If we're below the minimum voltage move up to the
896 * minimum voltage, if we're above the maximum voltage
897 * then move down to the maximum.
899 target_min
= current_uV
;
900 target_max
= current_uV
;
902 if (current_uV
< rdev
->constraints
->min_uV
) {
903 target_min
= rdev
->constraints
->min_uV
;
904 target_max
= rdev
->constraints
->min_uV
;
907 if (current_uV
> rdev
->constraints
->max_uV
) {
908 target_min
= rdev
->constraints
->max_uV
;
909 target_max
= rdev
->constraints
->max_uV
;
912 if (target_min
!= current_uV
|| target_max
!= current_uV
) {
913 rdev_info(rdev
, "Bringing %duV into %d-%duV\n",
914 current_uV
, target_min
, target_max
);
915 ret
= _regulator_do_set_voltage(
916 rdev
, target_min
, target_max
);
919 "failed to apply %d-%duV constraint(%d)\n",
920 target_min
, target_max
, ret
);
926 /* constrain machine-level voltage specs to fit
927 * the actual range supported by this regulator.
929 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
930 int count
= rdev
->desc
->n_voltages
;
932 int min_uV
= INT_MAX
;
933 int max_uV
= INT_MIN
;
934 int cmin
= constraints
->min_uV
;
935 int cmax
= constraints
->max_uV
;
937 /* it's safe to autoconfigure fixed-voltage supplies
938 and the constraints are used by list_voltage. */
939 if (count
== 1 && !cmin
) {
942 constraints
->min_uV
= cmin
;
943 constraints
->max_uV
= cmax
;
946 /* voltage constraints are optional */
947 if ((cmin
== 0) && (cmax
== 0))
950 /* else require explicit machine-level constraints */
951 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
952 rdev_err(rdev
, "invalid voltage constraints\n");
956 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
957 for (i
= 0; i
< count
; i
++) {
960 value
= ops
->list_voltage(rdev
, i
);
964 /* maybe adjust [min_uV..max_uV] */
965 if (value
>= cmin
&& value
< min_uV
)
967 if (value
<= cmax
&& value
> max_uV
)
971 /* final: [min_uV..max_uV] valid iff constraints valid */
972 if (max_uV
< min_uV
) {
974 "unsupportable voltage constraints %u-%uuV\n",
979 /* use regulator's subset of machine constraints */
980 if (constraints
->min_uV
< min_uV
) {
981 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
982 constraints
->min_uV
, min_uV
);
983 constraints
->min_uV
= min_uV
;
985 if (constraints
->max_uV
> max_uV
) {
986 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
987 constraints
->max_uV
, max_uV
);
988 constraints
->max_uV
= max_uV
;
995 static int machine_constraints_current(struct regulator_dev
*rdev
,
996 struct regulation_constraints
*constraints
)
998 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1001 if (!constraints
->min_uA
&& !constraints
->max_uA
)
1004 if (constraints
->min_uA
> constraints
->max_uA
) {
1005 rdev_err(rdev
, "Invalid current constraints\n");
1009 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
1010 rdev_warn(rdev
, "Operation of current configuration missing\n");
1014 /* Set regulator current in constraints range */
1015 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
1016 constraints
->max_uA
);
1018 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
1025 static int _regulator_do_enable(struct regulator_dev
*rdev
);
1028 * set_machine_constraints - sets regulator constraints
1029 * @rdev: regulator source
1030 * @constraints: constraints to apply
1032 * Allows platform initialisation code to define and constrain
1033 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1034 * Constraints *must* be set by platform code in order for some
1035 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1038 static int set_machine_constraints(struct regulator_dev
*rdev
,
1039 const struct regulation_constraints
*constraints
)
1042 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1045 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
1048 rdev
->constraints
= kzalloc(sizeof(*constraints
),
1050 if (!rdev
->constraints
)
1053 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
1057 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
1061 if (rdev
->constraints
->ilim_uA
&& ops
->set_input_current_limit
) {
1062 ret
= ops
->set_input_current_limit(rdev
,
1063 rdev
->constraints
->ilim_uA
);
1065 rdev_err(rdev
, "failed to set input limit\n");
1070 /* do we need to setup our suspend state */
1071 if (rdev
->constraints
->initial_state
) {
1072 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
1074 rdev_err(rdev
, "failed to set suspend state\n");
1079 if (rdev
->constraints
->initial_mode
) {
1080 if (!ops
->set_mode
) {
1081 rdev_err(rdev
, "no set_mode operation\n");
1085 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1087 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1092 /* If the constraints say the regulator should be on at this point
1093 * and we have control then make sure it is enabled.
1095 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
1096 ret
= _regulator_do_enable(rdev
);
1097 if (ret
< 0 && ret
!= -EINVAL
) {
1098 rdev_err(rdev
, "failed to enable\n");
1103 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1104 && ops
->set_ramp_delay
) {
1105 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1107 rdev_err(rdev
, "failed to set ramp_delay\n");
1112 if (rdev
->constraints
->pull_down
&& ops
->set_pull_down
) {
1113 ret
= ops
->set_pull_down(rdev
);
1115 rdev_err(rdev
, "failed to set pull down\n");
1120 if (rdev
->constraints
->soft_start
&& ops
->set_soft_start
) {
1121 ret
= ops
->set_soft_start(rdev
);
1123 rdev_err(rdev
, "failed to set soft start\n");
1128 if (rdev
->constraints
->over_current_protection
1129 && ops
->set_over_current_protection
) {
1130 ret
= ops
->set_over_current_protection(rdev
);
1132 rdev_err(rdev
, "failed to set over current protection\n");
1137 if (rdev
->constraints
->active_discharge
&& ops
->set_active_discharge
) {
1138 bool ad_state
= (rdev
->constraints
->active_discharge
==
1139 REGULATOR_ACTIVE_DISCHARGE_ENABLE
) ? true : false;
1141 ret
= ops
->set_active_discharge(rdev
, ad_state
);
1143 rdev_err(rdev
, "failed to set active discharge\n");
1148 if (rdev
->constraints
->active_discharge
&& ops
->set_active_discharge
) {
1149 bool ad_state
= (rdev
->constraints
->active_discharge
==
1150 REGULATOR_ACTIVE_DISCHARGE_ENABLE
) ? true : false;
1152 ret
= ops
->set_active_discharge(rdev
, ad_state
);
1154 rdev_err(rdev
, "failed to set active discharge\n");
1159 print_constraints(rdev
);
1164 * set_supply - set regulator supply regulator
1165 * @rdev: regulator name
1166 * @supply_rdev: supply regulator name
1168 * Called by platform initialisation code to set the supply regulator for this
1169 * regulator. This ensures that a regulators supply will also be enabled by the
1170 * core if it's child is enabled.
1172 static int set_supply(struct regulator_dev
*rdev
,
1173 struct regulator_dev
*supply_rdev
)
1177 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1179 if (!try_module_get(supply_rdev
->owner
))
1182 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1183 if (rdev
->supply
== NULL
) {
1187 supply_rdev
->open_count
++;
1193 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1194 * @rdev: regulator source
1195 * @consumer_dev_name: dev_name() string for device supply applies to
1196 * @supply: symbolic name for supply
1198 * Allows platform initialisation code to map physical regulator
1199 * sources to symbolic names for supplies for use by devices. Devices
1200 * should use these symbolic names to request regulators, avoiding the
1201 * need to provide board-specific regulator names as platform data.
1203 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1204 const char *consumer_dev_name
,
1207 struct regulator_map
*node
;
1213 if (consumer_dev_name
!= NULL
)
1218 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1219 if (node
->dev_name
&& consumer_dev_name
) {
1220 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1222 } else if (node
->dev_name
|| consumer_dev_name
) {
1226 if (strcmp(node
->supply
, supply
) != 0)
1229 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1231 dev_name(&node
->regulator
->dev
),
1232 node
->regulator
->desc
->name
,
1234 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1238 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1242 node
->regulator
= rdev
;
1243 node
->supply
= supply
;
1246 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1247 if (node
->dev_name
== NULL
) {
1253 list_add(&node
->list
, ®ulator_map_list
);
1257 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1259 struct regulator_map
*node
, *n
;
1261 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1262 if (rdev
== node
->regulator
) {
1263 list_del(&node
->list
);
1264 kfree(node
->dev_name
);
1270 #define REG_STR_SIZE 64
1272 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1274 const char *supply_name
)
1276 struct regulator
*regulator
;
1277 char buf
[REG_STR_SIZE
];
1280 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1281 if (regulator
== NULL
)
1284 mutex_lock(&rdev
->mutex
);
1285 regulator
->rdev
= rdev
;
1286 list_add(®ulator
->list
, &rdev
->consumer_list
);
1289 regulator
->dev
= dev
;
1291 /* Add a link to the device sysfs entry */
1292 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1293 dev
->kobj
.name
, supply_name
);
1294 if (size
>= REG_STR_SIZE
)
1297 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1298 if (regulator
->supply_name
== NULL
)
1301 err
= sysfs_create_link_nowarn(&rdev
->dev
.kobj
, &dev
->kobj
,
1304 rdev_dbg(rdev
, "could not add device link %s err %d\n",
1305 dev
->kobj
.name
, err
);
1309 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1310 if (regulator
->supply_name
== NULL
)
1314 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1316 if (!regulator
->debugfs
) {
1317 rdev_dbg(rdev
, "Failed to create debugfs directory\n");
1319 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1320 ®ulator
->uA_load
);
1321 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1322 ®ulator
->min_uV
);
1323 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1324 ®ulator
->max_uV
);
1328 * Check now if the regulator is an always on regulator - if
1329 * it is then we don't need to do nearly so much work for
1330 * enable/disable calls.
1332 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
) &&
1333 _regulator_is_enabled(rdev
))
1334 regulator
->always_on
= true;
1336 mutex_unlock(&rdev
->mutex
);
1339 list_del(®ulator
->list
);
1341 mutex_unlock(&rdev
->mutex
);
1345 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1347 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1348 return rdev
->constraints
->enable_time
;
1349 if (!rdev
->desc
->ops
->enable_time
)
1350 return rdev
->desc
->enable_time
;
1351 return rdev
->desc
->ops
->enable_time(rdev
);
1354 static struct regulator_supply_alias
*regulator_find_supply_alias(
1355 struct device
*dev
, const char *supply
)
1357 struct regulator_supply_alias
*map
;
1359 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1360 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1366 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1368 struct regulator_supply_alias
*map
;
1370 map
= regulator_find_supply_alias(*dev
, *supply
);
1372 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1373 *supply
, map
->alias_supply
,
1374 dev_name(map
->alias_dev
));
1375 *dev
= map
->alias_dev
;
1376 *supply
= map
->alias_supply
;
1380 static int of_node_match(struct device
*dev
, const void *data
)
1382 return dev
->of_node
== data
;
1385 static struct regulator_dev
*of_find_regulator_by_node(struct device_node
*np
)
1389 dev
= class_find_device(®ulator_class
, NULL
, np
, of_node_match
);
1391 return dev
? dev_to_rdev(dev
) : NULL
;
1394 static int regulator_match(struct device
*dev
, const void *data
)
1396 struct regulator_dev
*r
= dev_to_rdev(dev
);
1398 return strcmp(rdev_get_name(r
), data
) == 0;
1401 static struct regulator_dev
*regulator_lookup_by_name(const char *name
)
1405 dev
= class_find_device(®ulator_class
, NULL
, name
, regulator_match
);
1407 return dev
? dev_to_rdev(dev
) : NULL
;
1411 * regulator_dev_lookup - lookup a regulator device.
1412 * @dev: device for regulator "consumer".
1413 * @supply: Supply name or regulator ID.
1414 * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if
1415 * lookup could succeed in the future.
1417 * If successful, returns a struct regulator_dev that corresponds to the name
1418 * @supply and with the embedded struct device refcount incremented by one,
1419 * or NULL on failure. The refcount must be dropped by calling put_device().
1421 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1425 struct regulator_dev
*r
;
1426 struct device_node
*node
;
1427 struct regulator_map
*map
;
1428 const char *devname
= NULL
;
1430 regulator_supply_alias(&dev
, &supply
);
1432 /* first do a dt based lookup */
1433 if (dev
&& dev
->of_node
) {
1434 node
= of_get_regulator(dev
, supply
);
1436 r
= of_find_regulator_by_node(node
);
1439 *ret
= -EPROBE_DEFER
;
1443 * If we couldn't even get the node then it's
1444 * not just that the device didn't register
1445 * yet, there's no node and we'll never
1452 /* if not found, try doing it non-dt way */
1454 devname
= dev_name(dev
);
1456 r
= regulator_lookup_by_name(supply
);
1460 mutex_lock(®ulator_list_mutex
);
1461 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1462 /* If the mapping has a device set up it must match */
1463 if (map
->dev_name
&&
1464 (!devname
|| strcmp(map
->dev_name
, devname
)))
1467 if (strcmp(map
->supply
, supply
) == 0 &&
1468 get_device(&map
->regulator
->dev
)) {
1469 mutex_unlock(®ulator_list_mutex
);
1470 return map
->regulator
;
1473 mutex_unlock(®ulator_list_mutex
);
1478 static int regulator_resolve_supply(struct regulator_dev
*rdev
)
1480 struct regulator_dev
*r
;
1481 struct device
*dev
= rdev
->dev
.parent
;
1484 /* No supply to resovle? */
1485 if (!rdev
->supply_name
)
1488 /* Supply already resolved? */
1492 r
= regulator_dev_lookup(dev
, rdev
->supply_name
, &ret
);
1494 if (ret
== -ENODEV
) {
1496 * No supply was specified for this regulator and
1497 * there will never be one.
1502 /* Did the lookup explicitly defer for us? */
1503 if (ret
== -EPROBE_DEFER
)
1506 if (have_full_constraints()) {
1507 r
= dummy_regulator_rdev
;
1508 get_device(&r
->dev
);
1510 dev_err(dev
, "Failed to resolve %s-supply for %s\n",
1511 rdev
->supply_name
, rdev
->desc
->name
);
1512 return -EPROBE_DEFER
;
1516 /* Recursively resolve the supply of the supply */
1517 ret
= regulator_resolve_supply(r
);
1519 put_device(&r
->dev
);
1523 ret
= set_supply(rdev
, r
);
1525 put_device(&r
->dev
);
1529 /* Cascade always-on state to supply */
1530 if (_regulator_is_enabled(rdev
) && rdev
->supply
) {
1531 ret
= regulator_enable(rdev
->supply
);
1533 _regulator_put(rdev
->supply
);
1541 /* Internal regulator request function */
1542 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1543 bool exclusive
, bool allow_dummy
)
1545 struct regulator_dev
*rdev
;
1546 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1547 const char *devname
= NULL
;
1551 pr_err("get() with no identifier\n");
1552 return ERR_PTR(-EINVAL
);
1556 devname
= dev_name(dev
);
1558 if (have_full_constraints())
1561 ret
= -EPROBE_DEFER
;
1563 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1567 regulator
= ERR_PTR(ret
);
1570 * If we have return value from dev_lookup fail, we do not expect to
1571 * succeed, so, quit with appropriate error value
1573 if (ret
&& ret
!= -ENODEV
)
1577 devname
= "deviceless";
1580 * Assume that a regulator is physically present and enabled
1581 * even if it isn't hooked up and just provide a dummy.
1583 if (have_full_constraints() && allow_dummy
) {
1584 pr_warn("%s supply %s not found, using dummy regulator\n",
1587 rdev
= dummy_regulator_rdev
;
1588 get_device(&rdev
->dev
);
1590 /* Don't log an error when called from regulator_get_optional() */
1591 } else if (!have_full_constraints() || exclusive
) {
1592 dev_warn(dev
, "dummy supplies not allowed\n");
1598 if (rdev
->exclusive
) {
1599 regulator
= ERR_PTR(-EPERM
);
1600 put_device(&rdev
->dev
);
1604 if (exclusive
&& rdev
->open_count
) {
1605 regulator
= ERR_PTR(-EBUSY
);
1606 put_device(&rdev
->dev
);
1610 ret
= regulator_resolve_supply(rdev
);
1612 regulator
= ERR_PTR(ret
);
1613 put_device(&rdev
->dev
);
1617 if (!try_module_get(rdev
->owner
)) {
1618 put_device(&rdev
->dev
);
1622 regulator
= create_regulator(rdev
, dev
, id
);
1623 if (regulator
== NULL
) {
1624 regulator
= ERR_PTR(-ENOMEM
);
1625 put_device(&rdev
->dev
);
1626 module_put(rdev
->owner
);
1632 rdev
->exclusive
= 1;
1634 ret
= _regulator_is_enabled(rdev
);
1636 rdev
->use_count
= 1;
1638 rdev
->use_count
= 0;
1645 * regulator_get - lookup and obtain a reference to a regulator.
1646 * @dev: device for regulator "consumer"
1647 * @id: Supply name or regulator ID.
1649 * Returns a struct regulator corresponding to the regulator producer,
1650 * or IS_ERR() condition containing errno.
1652 * Use of supply names configured via regulator_set_device_supply() is
1653 * strongly encouraged. It is recommended that the supply name used
1654 * should match the name used for the supply and/or the relevant
1655 * device pins in the datasheet.
1657 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1659 return _regulator_get(dev
, id
, false, true);
1661 EXPORT_SYMBOL_GPL(regulator_get
);
1664 * regulator_get_exclusive - obtain exclusive access to a regulator.
1665 * @dev: device for regulator "consumer"
1666 * @id: Supply name or regulator ID.
1668 * Returns a struct regulator corresponding to the regulator producer,
1669 * or IS_ERR() condition containing errno. Other consumers will be
1670 * unable to obtain this regulator while this reference is held and the
1671 * use count for the regulator will be initialised to reflect the current
1672 * state of the regulator.
1674 * This is intended for use by consumers which cannot tolerate shared
1675 * use of the regulator such as those which need to force the
1676 * regulator off for correct operation of the hardware they are
1679 * Use of supply names configured via regulator_set_device_supply() is
1680 * strongly encouraged. It is recommended that the supply name used
1681 * should match the name used for the supply and/or the relevant
1682 * device pins in the datasheet.
1684 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1686 return _regulator_get(dev
, id
, true, false);
1688 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1691 * regulator_get_optional - obtain optional access to a regulator.
1692 * @dev: device for regulator "consumer"
1693 * @id: Supply name or regulator ID.
1695 * Returns a struct regulator corresponding to the regulator producer,
1696 * or IS_ERR() condition containing errno.
1698 * This is intended for use by consumers for devices which can have
1699 * some supplies unconnected in normal use, such as some MMC devices.
1700 * It can allow the regulator core to provide stub supplies for other
1701 * supplies requested using normal regulator_get() calls without
1702 * disrupting the operation of drivers that can handle absent
1705 * Use of supply names configured via regulator_set_device_supply() is
1706 * strongly encouraged. It is recommended that the supply name used
1707 * should match the name used for the supply and/or the relevant
1708 * device pins in the datasheet.
1710 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1712 return _regulator_get(dev
, id
, false, false);
1714 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1716 /* regulator_list_mutex lock held by regulator_put() */
1717 static void _regulator_put(struct regulator
*regulator
)
1719 struct regulator_dev
*rdev
;
1721 if (IS_ERR_OR_NULL(regulator
))
1724 lockdep_assert_held_once(®ulator_list_mutex
);
1726 rdev
= regulator
->rdev
;
1728 debugfs_remove_recursive(regulator
->debugfs
);
1730 /* remove any sysfs entries */
1732 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1733 mutex_lock(&rdev
->mutex
);
1734 list_del(®ulator
->list
);
1737 rdev
->exclusive
= 0;
1738 put_device(&rdev
->dev
);
1739 mutex_unlock(&rdev
->mutex
);
1741 kfree(regulator
->supply_name
);
1744 module_put(rdev
->owner
);
1748 * regulator_put - "free" the regulator source
1749 * @regulator: regulator source
1751 * Note: drivers must ensure that all regulator_enable calls made on this
1752 * regulator source are balanced by regulator_disable calls prior to calling
1755 void regulator_put(struct regulator
*regulator
)
1757 mutex_lock(®ulator_list_mutex
);
1758 _regulator_put(regulator
);
1759 mutex_unlock(®ulator_list_mutex
);
1761 EXPORT_SYMBOL_GPL(regulator_put
);
1764 * regulator_register_supply_alias - Provide device alias for supply lookup
1766 * @dev: device that will be given as the regulator "consumer"
1767 * @id: Supply name or regulator ID
1768 * @alias_dev: device that should be used to lookup the supply
1769 * @alias_id: Supply name or regulator ID that should be used to lookup the
1772 * All lookups for id on dev will instead be conducted for alias_id on
1775 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1776 struct device
*alias_dev
,
1777 const char *alias_id
)
1779 struct regulator_supply_alias
*map
;
1781 map
= regulator_find_supply_alias(dev
, id
);
1785 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1790 map
->src_supply
= id
;
1791 map
->alias_dev
= alias_dev
;
1792 map
->alias_supply
= alias_id
;
1794 list_add(&map
->list
, ®ulator_supply_alias_list
);
1796 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1797 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1801 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1804 * regulator_unregister_supply_alias - Remove device alias
1806 * @dev: device that will be given as the regulator "consumer"
1807 * @id: Supply name or regulator ID
1809 * Remove a lookup alias if one exists for id on dev.
1811 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1813 struct regulator_supply_alias
*map
;
1815 map
= regulator_find_supply_alias(dev
, id
);
1817 list_del(&map
->list
);
1821 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1824 * regulator_bulk_register_supply_alias - register multiple aliases
1826 * @dev: device that will be given as the regulator "consumer"
1827 * @id: List of supply names or regulator IDs
1828 * @alias_dev: device that should be used to lookup the supply
1829 * @alias_id: List of supply names or regulator IDs that should be used to
1831 * @num_id: Number of aliases to register
1833 * @return 0 on success, an errno on failure.
1835 * This helper function allows drivers to register several supply
1836 * aliases in one operation. If any of the aliases cannot be
1837 * registered any aliases that were registered will be removed
1838 * before returning to the caller.
1840 int regulator_bulk_register_supply_alias(struct device
*dev
,
1841 const char *const *id
,
1842 struct device
*alias_dev
,
1843 const char *const *alias_id
,
1849 for (i
= 0; i
< num_id
; ++i
) {
1850 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1860 "Failed to create supply alias %s,%s -> %s,%s\n",
1861 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1864 regulator_unregister_supply_alias(dev
, id
[i
]);
1868 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1871 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1873 * @dev: device that will be given as the regulator "consumer"
1874 * @id: List of supply names or regulator IDs
1875 * @num_id: Number of aliases to unregister
1877 * This helper function allows drivers to unregister several supply
1878 * aliases in one operation.
1880 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1881 const char *const *id
,
1886 for (i
= 0; i
< num_id
; ++i
)
1887 regulator_unregister_supply_alias(dev
, id
[i
]);
1889 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1892 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1893 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1894 const struct regulator_config
*config
)
1896 struct regulator_enable_gpio
*pin
;
1897 struct gpio_desc
*gpiod
;
1900 gpiod
= gpio_to_desc(config
->ena_gpio
);
1902 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1903 if (pin
->gpiod
== gpiod
) {
1904 rdev_dbg(rdev
, "GPIO %d is already used\n",
1906 goto update_ena_gpio_to_rdev
;
1910 ret
= gpio_request_one(config
->ena_gpio
,
1911 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1912 rdev_get_name(rdev
));
1916 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1918 gpio_free(config
->ena_gpio
);
1923 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1924 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1926 update_ena_gpio_to_rdev
:
1927 pin
->request_count
++;
1928 rdev
->ena_pin
= pin
;
1932 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1934 struct regulator_enable_gpio
*pin
, *n
;
1939 /* Free the GPIO only in case of no use */
1940 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1941 if (pin
->gpiod
== rdev
->ena_pin
->gpiod
) {
1942 if (pin
->request_count
<= 1) {
1943 pin
->request_count
= 0;
1944 gpiod_put(pin
->gpiod
);
1945 list_del(&pin
->list
);
1947 rdev
->ena_pin
= NULL
;
1950 pin
->request_count
--;
1957 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1958 * @rdev: regulator_dev structure
1959 * @enable: enable GPIO at initial use?
1961 * GPIO is enabled in case of initial use. (enable_count is 0)
1962 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1964 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1966 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1972 /* Enable GPIO at initial use */
1973 if (pin
->enable_count
== 0)
1974 gpiod_set_value_cansleep(pin
->gpiod
,
1975 !pin
->ena_gpio_invert
);
1977 pin
->enable_count
++;
1979 if (pin
->enable_count
> 1) {
1980 pin
->enable_count
--;
1984 /* Disable GPIO if not used */
1985 if (pin
->enable_count
<= 1) {
1986 gpiod_set_value_cansleep(pin
->gpiod
,
1987 pin
->ena_gpio_invert
);
1988 pin
->enable_count
= 0;
1996 * _regulator_enable_delay - a delay helper function
1997 * @delay: time to delay in microseconds
1999 * Delay for the requested amount of time as per the guidelines in:
2001 * Documentation/timers/timers-howto.txt
2003 * The assumption here is that regulators will never be enabled in
2004 * atomic context and therefore sleeping functions can be used.
2006 static void _regulator_enable_delay(unsigned int delay
)
2008 unsigned int ms
= delay
/ 1000;
2009 unsigned int us
= delay
% 1000;
2013 * For small enough values, handle super-millisecond
2014 * delays in the usleep_range() call below.
2023 * Give the scheduler some room to coalesce with any other
2024 * wakeup sources. For delays shorter than 10 us, don't even
2025 * bother setting up high-resolution timers and just busy-
2029 usleep_range(us
, us
+ 100);
2034 static int _regulator_do_enable(struct regulator_dev
*rdev
)
2038 /* Query before enabling in case configuration dependent. */
2039 ret
= _regulator_get_enable_time(rdev
);
2043 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
2047 trace_regulator_enable(rdev_get_name(rdev
));
2049 if (rdev
->desc
->off_on_delay
) {
2050 /* if needed, keep a distance of off_on_delay from last time
2051 * this regulator was disabled.
2053 unsigned long start_jiffy
= jiffies
;
2054 unsigned long intended
, max_delay
, remaining
;
2056 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
2057 intended
= rdev
->last_off_jiffy
+ max_delay
;
2059 if (time_before(start_jiffy
, intended
)) {
2060 /* calc remaining jiffies to deal with one-time
2062 * in case of multiple timer wrapping, either it can be
2063 * detected by out-of-range remaining, or it cannot be
2064 * detected and we gets a panelty of
2065 * _regulator_enable_delay().
2067 remaining
= intended
- start_jiffy
;
2068 if (remaining
<= max_delay
)
2069 _regulator_enable_delay(
2070 jiffies_to_usecs(remaining
));
2074 if (rdev
->ena_pin
) {
2075 if (!rdev
->ena_gpio_state
) {
2076 ret
= regulator_ena_gpio_ctrl(rdev
, true);
2079 rdev
->ena_gpio_state
= 1;
2081 } else if (rdev
->desc
->ops
->enable
) {
2082 ret
= rdev
->desc
->ops
->enable(rdev
);
2089 /* Allow the regulator to ramp; it would be useful to extend
2090 * this for bulk operations so that the regulators can ramp
2092 trace_regulator_enable_delay(rdev_get_name(rdev
));
2094 _regulator_enable_delay(delay
);
2096 trace_regulator_enable_complete(rdev_get_name(rdev
));
2101 /* locks held by regulator_enable() */
2102 static int _regulator_enable(struct regulator_dev
*rdev
)
2106 lockdep_assert_held_once(&rdev
->mutex
);
2108 /* check voltage and requested load before enabling */
2109 if (regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_DRMS
))
2110 drms_uA_update(rdev
);
2112 if (rdev
->use_count
== 0) {
2113 /* The regulator may on if it's not switchable or left on */
2114 ret
= _regulator_is_enabled(rdev
);
2115 if (ret
== -EINVAL
|| ret
== 0) {
2116 if (!regulator_ops_is_valid(rdev
,
2117 REGULATOR_CHANGE_STATUS
))
2120 ret
= _regulator_do_enable(rdev
);
2124 } else if (ret
< 0) {
2125 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
2128 /* Fallthrough on positive return values - already enabled */
2137 * regulator_enable - enable regulator output
2138 * @regulator: regulator source
2140 * Request that the regulator be enabled with the regulator output at
2141 * the predefined voltage or current value. Calls to regulator_enable()
2142 * must be balanced with calls to regulator_disable().
2144 * NOTE: the output value can be set by other drivers, boot loader or may be
2145 * hardwired in the regulator.
2147 int regulator_enable(struct regulator
*regulator
)
2149 struct regulator_dev
*rdev
= regulator
->rdev
;
2152 if (regulator
->always_on
)
2156 ret
= regulator_enable(rdev
->supply
);
2161 mutex_lock(&rdev
->mutex
);
2162 ret
= _regulator_enable(rdev
);
2163 mutex_unlock(&rdev
->mutex
);
2165 if (ret
!= 0 && rdev
->supply
)
2166 regulator_disable(rdev
->supply
);
2170 EXPORT_SYMBOL_GPL(regulator_enable
);
2172 static int _regulator_do_disable(struct regulator_dev
*rdev
)
2176 trace_regulator_disable(rdev_get_name(rdev
));
2178 if (rdev
->ena_pin
) {
2179 if (rdev
->ena_gpio_state
) {
2180 ret
= regulator_ena_gpio_ctrl(rdev
, false);
2183 rdev
->ena_gpio_state
= 0;
2186 } else if (rdev
->desc
->ops
->disable
) {
2187 ret
= rdev
->desc
->ops
->disable(rdev
);
2192 /* cares about last_off_jiffy only if off_on_delay is required by
2195 if (rdev
->desc
->off_on_delay
)
2196 rdev
->last_off_jiffy
= jiffies
;
2198 trace_regulator_disable_complete(rdev_get_name(rdev
));
2203 /* locks held by regulator_disable() */
2204 static int _regulator_disable(struct regulator_dev
*rdev
)
2208 lockdep_assert_held_once(&rdev
->mutex
);
2210 if (WARN(rdev
->use_count
<= 0,
2211 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
2214 /* are we the last user and permitted to disable ? */
2215 if (rdev
->use_count
== 1 &&
2216 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
2218 /* we are last user */
2219 if (regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
)) {
2220 ret
= _notifier_call_chain(rdev
,
2221 REGULATOR_EVENT_PRE_DISABLE
,
2223 if (ret
& NOTIFY_STOP_MASK
)
2226 ret
= _regulator_do_disable(rdev
);
2228 rdev_err(rdev
, "failed to disable\n");
2229 _notifier_call_chain(rdev
,
2230 REGULATOR_EVENT_ABORT_DISABLE
,
2234 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
2238 rdev
->use_count
= 0;
2239 } else if (rdev
->use_count
> 1) {
2240 if (regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_DRMS
))
2241 drms_uA_update(rdev
);
2250 * regulator_disable - disable regulator output
2251 * @regulator: regulator source
2253 * Disable the regulator output voltage or current. Calls to
2254 * regulator_enable() must be balanced with calls to
2255 * regulator_disable().
2257 * NOTE: this will only disable the regulator output if no other consumer
2258 * devices have it enabled, the regulator device supports disabling and
2259 * machine constraints permit this operation.
2261 int regulator_disable(struct regulator
*regulator
)
2263 struct regulator_dev
*rdev
= regulator
->rdev
;
2266 if (regulator
->always_on
)
2269 mutex_lock(&rdev
->mutex
);
2270 ret
= _regulator_disable(rdev
);
2271 mutex_unlock(&rdev
->mutex
);
2273 if (ret
== 0 && rdev
->supply
)
2274 regulator_disable(rdev
->supply
);
2278 EXPORT_SYMBOL_GPL(regulator_disable
);
2280 /* locks held by regulator_force_disable() */
2281 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2285 lockdep_assert_held_once(&rdev
->mutex
);
2287 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2288 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2289 if (ret
& NOTIFY_STOP_MASK
)
2292 ret
= _regulator_do_disable(rdev
);
2294 rdev_err(rdev
, "failed to force disable\n");
2295 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2296 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2300 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2301 REGULATOR_EVENT_DISABLE
, NULL
);
2307 * regulator_force_disable - force disable regulator output
2308 * @regulator: regulator source
2310 * Forcibly disable the regulator output voltage or current.
2311 * NOTE: this *will* disable the regulator output even if other consumer
2312 * devices have it enabled. This should be used for situations when device
2313 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2315 int regulator_force_disable(struct regulator
*regulator
)
2317 struct regulator_dev
*rdev
= regulator
->rdev
;
2320 mutex_lock(&rdev
->mutex
);
2321 regulator
->uA_load
= 0;
2322 ret
= _regulator_force_disable(regulator
->rdev
);
2323 mutex_unlock(&rdev
->mutex
);
2326 while (rdev
->open_count
--)
2327 regulator_disable(rdev
->supply
);
2331 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2333 static void regulator_disable_work(struct work_struct
*work
)
2335 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2339 mutex_lock(&rdev
->mutex
);
2341 BUG_ON(!rdev
->deferred_disables
);
2343 count
= rdev
->deferred_disables
;
2344 rdev
->deferred_disables
= 0;
2346 for (i
= 0; i
< count
; i
++) {
2347 ret
= _regulator_disable(rdev
);
2349 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2352 mutex_unlock(&rdev
->mutex
);
2355 for (i
= 0; i
< count
; i
++) {
2356 ret
= regulator_disable(rdev
->supply
);
2359 "Supply disable failed: %d\n", ret
);
2366 * regulator_disable_deferred - disable regulator output with delay
2367 * @regulator: regulator source
2368 * @ms: miliseconds until the regulator is disabled
2370 * Execute regulator_disable() on the regulator after a delay. This
2371 * is intended for use with devices that require some time to quiesce.
2373 * NOTE: this will only disable the regulator output if no other consumer
2374 * devices have it enabled, the regulator device supports disabling and
2375 * machine constraints permit this operation.
2377 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2379 struct regulator_dev
*rdev
= regulator
->rdev
;
2381 if (regulator
->always_on
)
2385 return regulator_disable(regulator
);
2387 mutex_lock(&rdev
->mutex
);
2388 rdev
->deferred_disables
++;
2389 mutex_unlock(&rdev
->mutex
);
2391 queue_delayed_work(system_power_efficient_wq
, &rdev
->disable_work
,
2392 msecs_to_jiffies(ms
));
2395 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2397 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2399 /* A GPIO control always takes precedence */
2401 return rdev
->ena_gpio_state
;
2403 /* If we don't know then assume that the regulator is always on */
2404 if (!rdev
->desc
->ops
->is_enabled
)
2407 return rdev
->desc
->ops
->is_enabled(rdev
);
2410 static int _regulator_list_voltage(struct regulator
*regulator
,
2411 unsigned selector
, int lock
)
2413 struct regulator_dev
*rdev
= regulator
->rdev
;
2414 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2417 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2418 return rdev
->desc
->fixed_uV
;
2420 if (ops
->list_voltage
) {
2421 if (selector
>= rdev
->desc
->n_voltages
)
2424 mutex_lock(&rdev
->mutex
);
2425 ret
= ops
->list_voltage(rdev
, selector
);
2427 mutex_unlock(&rdev
->mutex
);
2428 } else if (rdev
->supply
) {
2429 ret
= _regulator_list_voltage(rdev
->supply
, selector
, lock
);
2435 if (ret
< rdev
->constraints
->min_uV
)
2437 else if (ret
> rdev
->constraints
->max_uV
)
2445 * regulator_is_enabled - is the regulator output enabled
2446 * @regulator: regulator source
2448 * Returns positive if the regulator driver backing the source/client
2449 * has requested that the device be enabled, zero if it hasn't, else a
2450 * negative errno code.
2452 * Note that the device backing this regulator handle can have multiple
2453 * users, so it might be enabled even if regulator_enable() was never
2454 * called for this particular source.
2456 int regulator_is_enabled(struct regulator
*regulator
)
2460 if (regulator
->always_on
)
2463 mutex_lock(®ulator
->rdev
->mutex
);
2464 ret
= _regulator_is_enabled(regulator
->rdev
);
2465 mutex_unlock(®ulator
->rdev
->mutex
);
2469 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2472 * regulator_can_change_voltage - check if regulator can change voltage
2473 * @regulator: regulator source
2475 * Returns positive if the regulator driver backing the source/client
2476 * can change its voltage, false otherwise. Useful for detecting fixed
2477 * or dummy regulators and disabling voltage change logic in the client
2480 int regulator_can_change_voltage(struct regulator
*regulator
)
2482 struct regulator_dev
*rdev
= regulator
->rdev
;
2484 if (regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
2485 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2488 if (rdev
->desc
->continuous_voltage_range
&&
2489 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2490 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2496 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2499 * regulator_count_voltages - count regulator_list_voltage() selectors
2500 * @regulator: regulator source
2502 * Returns number of selectors, or negative errno. Selectors are
2503 * numbered starting at zero, and typically correspond to bitfields
2504 * in hardware registers.
2506 int regulator_count_voltages(struct regulator
*regulator
)
2508 struct regulator_dev
*rdev
= regulator
->rdev
;
2510 if (rdev
->desc
->n_voltages
)
2511 return rdev
->desc
->n_voltages
;
2516 return regulator_count_voltages(rdev
->supply
);
2518 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2521 * regulator_list_voltage - enumerate supported voltages
2522 * @regulator: regulator source
2523 * @selector: identify voltage to list
2524 * Context: can sleep
2526 * Returns a voltage that can be passed to @regulator_set_voltage(),
2527 * zero if this selector code can't be used on this system, or a
2530 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2532 return _regulator_list_voltage(regulator
, selector
, 1);
2534 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2537 * regulator_get_regmap - get the regulator's register map
2538 * @regulator: regulator source
2540 * Returns the register map for the given regulator, or an ERR_PTR value
2541 * if the regulator doesn't use regmap.
2543 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
2545 struct regmap
*map
= regulator
->rdev
->regmap
;
2547 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
2551 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2552 * @regulator: regulator source
2553 * @vsel_reg: voltage selector register, output parameter
2554 * @vsel_mask: mask for voltage selector bitfield, output parameter
2556 * Returns the hardware register offset and bitmask used for setting the
2557 * regulator voltage. This might be useful when configuring voltage-scaling
2558 * hardware or firmware that can make I2C requests behind the kernel's back,
2561 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2562 * and 0 is returned, otherwise a negative errno is returned.
2564 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
2566 unsigned *vsel_mask
)
2568 struct regulator_dev
*rdev
= regulator
->rdev
;
2569 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2571 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2574 *vsel_reg
= rdev
->desc
->vsel_reg
;
2575 *vsel_mask
= rdev
->desc
->vsel_mask
;
2579 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
2582 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2583 * @regulator: regulator source
2584 * @selector: identify voltage to list
2586 * Converts the selector to a hardware-specific voltage selector that can be
2587 * directly written to the regulator registers. The address of the voltage
2588 * register can be determined by calling @regulator_get_hardware_vsel_register.
2590 * On error a negative errno is returned.
2592 int regulator_list_hardware_vsel(struct regulator
*regulator
,
2595 struct regulator_dev
*rdev
= regulator
->rdev
;
2596 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2598 if (selector
>= rdev
->desc
->n_voltages
)
2600 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2605 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
2608 * regulator_get_linear_step - return the voltage step size between VSEL values
2609 * @regulator: regulator source
2611 * Returns the voltage step size between VSEL values for linear
2612 * regulators, or return 0 if the regulator isn't a linear regulator.
2614 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2616 struct regulator_dev
*rdev
= regulator
->rdev
;
2618 return rdev
->desc
->uV_step
;
2620 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2623 * regulator_is_supported_voltage - check if a voltage range can be supported
2625 * @regulator: Regulator to check.
2626 * @min_uV: Minimum required voltage in uV.
2627 * @max_uV: Maximum required voltage in uV.
2629 * Returns a boolean or a negative error code.
2631 int regulator_is_supported_voltage(struct regulator
*regulator
,
2632 int min_uV
, int max_uV
)
2634 struct regulator_dev
*rdev
= regulator
->rdev
;
2635 int i
, voltages
, ret
;
2637 /* If we can't change voltage check the current voltage */
2638 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
2639 ret
= regulator_get_voltage(regulator
);
2641 return min_uV
<= ret
&& ret
<= max_uV
;
2646 /* Any voltage within constrains range is fine? */
2647 if (rdev
->desc
->continuous_voltage_range
)
2648 return min_uV
>= rdev
->constraints
->min_uV
&&
2649 max_uV
<= rdev
->constraints
->max_uV
;
2651 ret
= regulator_count_voltages(regulator
);
2656 for (i
= 0; i
< voltages
; i
++) {
2657 ret
= regulator_list_voltage(regulator
, i
);
2659 if (ret
>= min_uV
&& ret
<= max_uV
)
2665 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2667 static int regulator_map_voltage(struct regulator_dev
*rdev
, int min_uV
,
2670 const struct regulator_desc
*desc
= rdev
->desc
;
2672 if (desc
->ops
->map_voltage
)
2673 return desc
->ops
->map_voltage(rdev
, min_uV
, max_uV
);
2675 if (desc
->ops
->list_voltage
== regulator_list_voltage_linear
)
2676 return regulator_map_voltage_linear(rdev
, min_uV
, max_uV
);
2678 if (desc
->ops
->list_voltage
== regulator_list_voltage_linear_range
)
2679 return regulator_map_voltage_linear_range(rdev
, min_uV
, max_uV
);
2681 return regulator_map_voltage_iterate(rdev
, min_uV
, max_uV
);
2684 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
2685 int min_uV
, int max_uV
,
2688 struct pre_voltage_change_data data
;
2691 data
.old_uV
= _regulator_get_voltage(rdev
);
2692 data
.min_uV
= min_uV
;
2693 data
.max_uV
= max_uV
;
2694 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2696 if (ret
& NOTIFY_STOP_MASK
)
2699 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
2703 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2704 (void *)data
.old_uV
);
2709 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
2710 int uV
, unsigned selector
)
2712 struct pre_voltage_change_data data
;
2715 data
.old_uV
= _regulator_get_voltage(rdev
);
2718 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2720 if (ret
& NOTIFY_STOP_MASK
)
2723 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
2727 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2728 (void *)data
.old_uV
);
2733 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2734 int min_uV
, int max_uV
)
2739 unsigned int selector
;
2740 int old_selector
= -1;
2742 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2744 min_uV
+= rdev
->constraints
->uV_offset
;
2745 max_uV
+= rdev
->constraints
->uV_offset
;
2748 * If we can't obtain the old selector there is not enough
2749 * info to call set_voltage_time_sel().
2751 if (_regulator_is_enabled(rdev
) &&
2752 rdev
->desc
->ops
->set_voltage_time_sel
&&
2753 rdev
->desc
->ops
->get_voltage_sel
) {
2754 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2755 if (old_selector
< 0)
2756 return old_selector
;
2759 if (rdev
->desc
->ops
->set_voltage
) {
2760 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
2764 if (rdev
->desc
->ops
->list_voltage
)
2765 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2768 best_val
= _regulator_get_voltage(rdev
);
2771 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2772 ret
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
2774 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2775 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2777 if (old_selector
== selector
)
2780 ret
= _regulator_call_set_voltage_sel(
2781 rdev
, best_val
, selector
);
2790 /* Call set_voltage_time_sel if successfully obtained old_selector */
2791 if (ret
== 0 && !rdev
->constraints
->ramp_disable
&& old_selector
>= 0
2792 && old_selector
!= selector
) {
2794 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2795 old_selector
, selector
);
2797 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2802 /* Insert any necessary delays */
2803 if (delay
>= 1000) {
2804 mdelay(delay
/ 1000);
2805 udelay(delay
% 1000);
2811 if (ret
== 0 && best_val
>= 0) {
2812 unsigned long data
= best_val
;
2814 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2818 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2823 static int regulator_set_voltage_unlocked(struct regulator
*regulator
,
2824 int min_uV
, int max_uV
)
2826 struct regulator_dev
*rdev
= regulator
->rdev
;
2828 int old_min_uV
, old_max_uV
;
2830 int best_supply_uV
= 0;
2831 int supply_change_uV
= 0;
2833 /* If we're setting the same range as last time the change
2834 * should be a noop (some cpufreq implementations use the same
2835 * voltage for multiple frequencies, for example).
2837 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2840 /* If we're trying to set a range that overlaps the current voltage,
2841 * return successfully even though the regulator does not support
2842 * changing the voltage.
2844 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
2845 current_uV
= _regulator_get_voltage(rdev
);
2846 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
2847 regulator
->min_uV
= min_uV
;
2848 regulator
->max_uV
= max_uV
;
2854 if (!rdev
->desc
->ops
->set_voltage
&&
2855 !rdev
->desc
->ops
->set_voltage_sel
) {
2860 /* constraints check */
2861 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2865 /* restore original values in case of error */
2866 old_min_uV
= regulator
->min_uV
;
2867 old_max_uV
= regulator
->max_uV
;
2868 regulator
->min_uV
= min_uV
;
2869 regulator
->max_uV
= max_uV
;
2871 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2875 if (rdev
->supply
&& (rdev
->desc
->min_dropout_uV
||
2876 !rdev
->desc
->ops
->get_voltage
)) {
2877 int current_supply_uV
;
2880 selector
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
2886 best_supply_uV
= _regulator_list_voltage(regulator
, selector
, 0);
2887 if (best_supply_uV
< 0) {
2888 ret
= best_supply_uV
;
2892 best_supply_uV
+= rdev
->desc
->min_dropout_uV
;
2894 current_supply_uV
= _regulator_get_voltage(rdev
->supply
->rdev
);
2895 if (current_supply_uV
< 0) {
2896 ret
= current_supply_uV
;
2900 supply_change_uV
= best_supply_uV
- current_supply_uV
;
2903 if (supply_change_uV
> 0) {
2904 ret
= regulator_set_voltage_unlocked(rdev
->supply
,
2905 best_supply_uV
, INT_MAX
);
2907 dev_err(&rdev
->dev
, "Failed to increase supply voltage: %d\n",
2913 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2917 if (supply_change_uV
< 0) {
2918 ret
= regulator_set_voltage_unlocked(rdev
->supply
,
2919 best_supply_uV
, INT_MAX
);
2921 dev_warn(&rdev
->dev
, "Failed to decrease supply voltage: %d\n",
2923 /* No need to fail here */
2930 regulator
->min_uV
= old_min_uV
;
2931 regulator
->max_uV
= old_max_uV
;
2937 * regulator_set_voltage - set regulator output voltage
2938 * @regulator: regulator source
2939 * @min_uV: Minimum required voltage in uV
2940 * @max_uV: Maximum acceptable voltage in uV
2942 * Sets a voltage regulator to the desired output voltage. This can be set
2943 * during any regulator state. IOW, regulator can be disabled or enabled.
2945 * If the regulator is enabled then the voltage will change to the new value
2946 * immediately otherwise if the regulator is disabled the regulator will
2947 * output at the new voltage when enabled.
2949 * NOTE: If the regulator is shared between several devices then the lowest
2950 * request voltage that meets the system constraints will be used.
2951 * Regulator system constraints must be set for this regulator before
2952 * calling this function otherwise this call will fail.
2954 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2958 regulator_lock_supply(regulator
->rdev
);
2960 ret
= regulator_set_voltage_unlocked(regulator
, min_uV
, max_uV
);
2962 regulator_unlock_supply(regulator
->rdev
);
2966 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2969 * regulator_set_voltage_time - get raise/fall time
2970 * @regulator: regulator source
2971 * @old_uV: starting voltage in microvolts
2972 * @new_uV: target voltage in microvolts
2974 * Provided with the starting and ending voltage, this function attempts to
2975 * calculate the time in microseconds required to rise or fall to this new
2978 int regulator_set_voltage_time(struct regulator
*regulator
,
2979 int old_uV
, int new_uV
)
2981 struct regulator_dev
*rdev
= regulator
->rdev
;
2982 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2988 /* Currently requires operations to do this */
2989 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2990 || !rdev
->desc
->n_voltages
)
2993 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2994 /* We only look for exact voltage matches here */
2995 voltage
= regulator_list_voltage(regulator
, i
);
3000 if (voltage
== old_uV
)
3002 if (voltage
== new_uV
)
3006 if (old_sel
< 0 || new_sel
< 0)
3009 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
3011 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
3014 * regulator_set_voltage_time_sel - get raise/fall time
3015 * @rdev: regulator source device
3016 * @old_selector: selector for starting voltage
3017 * @new_selector: selector for target voltage
3019 * Provided with the starting and target voltage selectors, this function
3020 * returns time in microseconds required to rise or fall to this new voltage
3022 * Drivers providing ramp_delay in regulation_constraints can use this as their
3023 * set_voltage_time_sel() operation.
3025 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
3026 unsigned int old_selector
,
3027 unsigned int new_selector
)
3029 unsigned int ramp_delay
= 0;
3030 int old_volt
, new_volt
;
3032 if (rdev
->constraints
->ramp_delay
)
3033 ramp_delay
= rdev
->constraints
->ramp_delay
;
3034 else if (rdev
->desc
->ramp_delay
)
3035 ramp_delay
= rdev
->desc
->ramp_delay
;
3037 if (ramp_delay
== 0) {
3038 rdev_warn(rdev
, "ramp_delay not set\n");
3043 if (!rdev
->desc
->ops
->list_voltage
)
3046 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
3047 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
3049 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
3051 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
3054 * regulator_sync_voltage - re-apply last regulator output voltage
3055 * @regulator: regulator source
3057 * Re-apply the last configured voltage. This is intended to be used
3058 * where some external control source the consumer is cooperating with
3059 * has caused the configured voltage to change.
3061 int regulator_sync_voltage(struct regulator
*regulator
)
3063 struct regulator_dev
*rdev
= regulator
->rdev
;
3064 int ret
, min_uV
, max_uV
;
3066 mutex_lock(&rdev
->mutex
);
3068 if (!rdev
->desc
->ops
->set_voltage
&&
3069 !rdev
->desc
->ops
->set_voltage_sel
) {
3074 /* This is only going to work if we've had a voltage configured. */
3075 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
3080 min_uV
= regulator
->min_uV
;
3081 max_uV
= regulator
->max_uV
;
3083 /* This should be a paranoia check... */
3084 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
3088 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
3092 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
3095 mutex_unlock(&rdev
->mutex
);
3098 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
3100 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
3104 if (rdev
->desc
->ops
->get_voltage_sel
) {
3105 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
3108 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
3109 } else if (rdev
->desc
->ops
->get_voltage
) {
3110 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
3111 } else if (rdev
->desc
->ops
->list_voltage
) {
3112 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
3113 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
3114 ret
= rdev
->desc
->fixed_uV
;
3115 } else if (rdev
->supply
) {
3116 ret
= _regulator_get_voltage(rdev
->supply
->rdev
);
3123 return ret
- rdev
->constraints
->uV_offset
;
3127 * regulator_get_voltage - get regulator output voltage
3128 * @regulator: regulator source
3130 * This returns the current regulator voltage in uV.
3132 * NOTE: If the regulator is disabled it will return the voltage value. This
3133 * function should not be used to determine regulator state.
3135 int regulator_get_voltage(struct regulator
*regulator
)
3139 regulator_lock_supply(regulator
->rdev
);
3141 ret
= _regulator_get_voltage(regulator
->rdev
);
3143 regulator_unlock_supply(regulator
->rdev
);
3147 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
3150 * regulator_set_current_limit - set regulator output current limit
3151 * @regulator: regulator source
3152 * @min_uA: Minimum supported current in uA
3153 * @max_uA: Maximum supported current in uA
3155 * Sets current sink to the desired output current. This can be set during
3156 * any regulator state. IOW, regulator can be disabled or enabled.
3158 * If the regulator is enabled then the current will change to the new value
3159 * immediately otherwise if the regulator is disabled the regulator will
3160 * output at the new current when enabled.
3162 * NOTE: Regulator system constraints must be set for this regulator before
3163 * calling this function otherwise this call will fail.
3165 int regulator_set_current_limit(struct regulator
*regulator
,
3166 int min_uA
, int max_uA
)
3168 struct regulator_dev
*rdev
= regulator
->rdev
;
3171 mutex_lock(&rdev
->mutex
);
3174 if (!rdev
->desc
->ops
->set_current_limit
) {
3179 /* constraints check */
3180 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
3184 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
3186 mutex_unlock(&rdev
->mutex
);
3189 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
3191 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
3195 mutex_lock(&rdev
->mutex
);
3198 if (!rdev
->desc
->ops
->get_current_limit
) {
3203 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
3205 mutex_unlock(&rdev
->mutex
);
3210 * regulator_get_current_limit - get regulator output current
3211 * @regulator: regulator source
3213 * This returns the current supplied by the specified current sink in uA.
3215 * NOTE: If the regulator is disabled it will return the current value. This
3216 * function should not be used to determine regulator state.
3218 int regulator_get_current_limit(struct regulator
*regulator
)
3220 return _regulator_get_current_limit(regulator
->rdev
);
3222 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
3225 * regulator_set_mode - set regulator operating mode
3226 * @regulator: regulator source
3227 * @mode: operating mode - one of the REGULATOR_MODE constants
3229 * Set regulator operating mode to increase regulator efficiency or improve
3230 * regulation performance.
3232 * NOTE: Regulator system constraints must be set for this regulator before
3233 * calling this function otherwise this call will fail.
3235 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
3237 struct regulator_dev
*rdev
= regulator
->rdev
;
3239 int regulator_curr_mode
;
3241 mutex_lock(&rdev
->mutex
);
3244 if (!rdev
->desc
->ops
->set_mode
) {
3249 /* return if the same mode is requested */
3250 if (rdev
->desc
->ops
->get_mode
) {
3251 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
3252 if (regulator_curr_mode
== mode
) {
3258 /* constraints check */
3259 ret
= regulator_mode_constrain(rdev
, &mode
);
3263 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
3265 mutex_unlock(&rdev
->mutex
);
3268 EXPORT_SYMBOL_GPL(regulator_set_mode
);
3270 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
3274 mutex_lock(&rdev
->mutex
);
3277 if (!rdev
->desc
->ops
->get_mode
) {
3282 ret
= rdev
->desc
->ops
->get_mode(rdev
);
3284 mutex_unlock(&rdev
->mutex
);
3289 * regulator_get_mode - get regulator operating mode
3290 * @regulator: regulator source
3292 * Get the current regulator operating mode.
3294 unsigned int regulator_get_mode(struct regulator
*regulator
)
3296 return _regulator_get_mode(regulator
->rdev
);
3298 EXPORT_SYMBOL_GPL(regulator_get_mode
);
3301 * regulator_set_load - set regulator load
3302 * @regulator: regulator source
3303 * @uA_load: load current
3305 * Notifies the regulator core of a new device load. This is then used by
3306 * DRMS (if enabled by constraints) to set the most efficient regulator
3307 * operating mode for the new regulator loading.
3309 * Consumer devices notify their supply regulator of the maximum power
3310 * they will require (can be taken from device datasheet in the power
3311 * consumption tables) when they change operational status and hence power
3312 * state. Examples of operational state changes that can affect power
3313 * consumption are :-
3315 * o Device is opened / closed.
3316 * o Device I/O is about to begin or has just finished.
3317 * o Device is idling in between work.
3319 * This information is also exported via sysfs to userspace.
3321 * DRMS will sum the total requested load on the regulator and change
3322 * to the most efficient operating mode if platform constraints allow.
3324 * On error a negative errno is returned.
3326 int regulator_set_load(struct regulator
*regulator
, int uA_load
)
3328 struct regulator_dev
*rdev
= regulator
->rdev
;
3331 mutex_lock(&rdev
->mutex
);
3332 regulator
->uA_load
= uA_load
;
3333 ret
= drms_uA_update(rdev
);
3334 mutex_unlock(&rdev
->mutex
);
3338 EXPORT_SYMBOL_GPL(regulator_set_load
);
3341 * regulator_allow_bypass - allow the regulator to go into bypass mode
3343 * @regulator: Regulator to configure
3344 * @enable: enable or disable bypass mode
3346 * Allow the regulator to go into bypass mode if all other consumers
3347 * for the regulator also enable bypass mode and the machine
3348 * constraints allow this. Bypass mode means that the regulator is
3349 * simply passing the input directly to the output with no regulation.
3351 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3353 struct regulator_dev
*rdev
= regulator
->rdev
;
3356 if (!rdev
->desc
->ops
->set_bypass
)
3359 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_BYPASS
))
3362 mutex_lock(&rdev
->mutex
);
3364 if (enable
&& !regulator
->bypass
) {
3365 rdev
->bypass_count
++;
3367 if (rdev
->bypass_count
== rdev
->open_count
) {
3368 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3370 rdev
->bypass_count
--;
3373 } else if (!enable
&& regulator
->bypass
) {
3374 rdev
->bypass_count
--;
3376 if (rdev
->bypass_count
!= rdev
->open_count
) {
3377 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3379 rdev
->bypass_count
++;
3384 regulator
->bypass
= enable
;
3386 mutex_unlock(&rdev
->mutex
);
3390 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3393 * regulator_register_notifier - register regulator event notifier
3394 * @regulator: regulator source
3395 * @nb: notifier block
3397 * Register notifier block to receive regulator events.
3399 int regulator_register_notifier(struct regulator
*regulator
,
3400 struct notifier_block
*nb
)
3402 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3405 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3408 * regulator_unregister_notifier - unregister regulator event notifier
3409 * @regulator: regulator source
3410 * @nb: notifier block
3412 * Unregister regulator event notifier block.
3414 int regulator_unregister_notifier(struct regulator
*regulator
,
3415 struct notifier_block
*nb
)
3417 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3420 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3422 /* notify regulator consumers and downstream regulator consumers.
3423 * Note mutex must be held by caller.
3425 static int _notifier_call_chain(struct regulator_dev
*rdev
,
3426 unsigned long event
, void *data
)
3428 /* call rdev chain first */
3429 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3433 * regulator_bulk_get - get multiple regulator consumers
3435 * @dev: Device to supply
3436 * @num_consumers: Number of consumers to register
3437 * @consumers: Configuration of consumers; clients are stored here.
3439 * @return 0 on success, an errno on failure.
3441 * This helper function allows drivers to get several regulator
3442 * consumers in one operation. If any of the regulators cannot be
3443 * acquired then any regulators that were allocated will be freed
3444 * before returning to the caller.
3446 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3447 struct regulator_bulk_data
*consumers
)
3452 for (i
= 0; i
< num_consumers
; i
++)
3453 consumers
[i
].consumer
= NULL
;
3455 for (i
= 0; i
< num_consumers
; i
++) {
3456 consumers
[i
].consumer
= _regulator_get(dev
,
3457 consumers
[i
].supply
,
3459 !consumers
[i
].optional
);
3460 if (IS_ERR(consumers
[i
].consumer
)) {
3461 ret
= PTR_ERR(consumers
[i
].consumer
);
3462 dev_err(dev
, "Failed to get supply '%s': %d\n",
3463 consumers
[i
].supply
, ret
);
3464 consumers
[i
].consumer
= NULL
;
3473 regulator_put(consumers
[i
].consumer
);
3477 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3479 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3481 struct regulator_bulk_data
*bulk
= data
;
3483 bulk
->ret
= regulator_enable(bulk
->consumer
);
3487 * regulator_bulk_enable - enable multiple regulator consumers
3489 * @num_consumers: Number of consumers
3490 * @consumers: Consumer data; clients are stored here.
3491 * @return 0 on success, an errno on failure
3493 * This convenience API allows consumers to enable multiple regulator
3494 * clients in a single API call. If any consumers cannot be enabled
3495 * then any others that were enabled will be disabled again prior to
3498 int regulator_bulk_enable(int num_consumers
,
3499 struct regulator_bulk_data
*consumers
)
3501 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3505 for (i
= 0; i
< num_consumers
; i
++) {
3506 if (consumers
[i
].consumer
->always_on
)
3507 consumers
[i
].ret
= 0;
3509 async_schedule_domain(regulator_bulk_enable_async
,
3510 &consumers
[i
], &async_domain
);
3513 async_synchronize_full_domain(&async_domain
);
3515 /* If any consumer failed we need to unwind any that succeeded */
3516 for (i
= 0; i
< num_consumers
; i
++) {
3517 if (consumers
[i
].ret
!= 0) {
3518 ret
= consumers
[i
].ret
;
3526 for (i
= 0; i
< num_consumers
; i
++) {
3527 if (consumers
[i
].ret
< 0)
3528 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3531 regulator_disable(consumers
[i
].consumer
);
3536 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3539 * regulator_bulk_disable - disable multiple regulator consumers
3541 * @num_consumers: Number of consumers
3542 * @consumers: Consumer data; clients are stored here.
3543 * @return 0 on success, an errno on failure
3545 * This convenience API allows consumers to disable multiple regulator
3546 * clients in a single API call. If any consumers cannot be disabled
3547 * then any others that were disabled will be enabled again prior to
3550 int regulator_bulk_disable(int num_consumers
,
3551 struct regulator_bulk_data
*consumers
)
3556 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3557 ret
= regulator_disable(consumers
[i
].consumer
);
3565 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3566 for (++i
; i
< num_consumers
; ++i
) {
3567 r
= regulator_enable(consumers
[i
].consumer
);
3569 pr_err("Failed to reename %s: %d\n",
3570 consumers
[i
].supply
, r
);
3575 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3578 * regulator_bulk_force_disable - force disable multiple regulator consumers
3580 * @num_consumers: Number of consumers
3581 * @consumers: Consumer data; clients are stored here.
3582 * @return 0 on success, an errno on failure
3584 * This convenience API allows consumers to forcibly disable multiple regulator
3585 * clients in a single API call.
3586 * NOTE: This should be used for situations when device damage will
3587 * likely occur if the regulators are not disabled (e.g. over temp).
3588 * Although regulator_force_disable function call for some consumers can
3589 * return error numbers, the function is called for all consumers.
3591 int regulator_bulk_force_disable(int num_consumers
,
3592 struct regulator_bulk_data
*consumers
)
3597 for (i
= 0; i
< num_consumers
; i
++)
3599 regulator_force_disable(consumers
[i
].consumer
);
3601 for (i
= 0; i
< num_consumers
; i
++) {
3602 if (consumers
[i
].ret
!= 0) {
3603 ret
= consumers
[i
].ret
;
3612 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3615 * regulator_bulk_free - free multiple regulator consumers
3617 * @num_consumers: Number of consumers
3618 * @consumers: Consumer data; clients are stored here.
3620 * This convenience API allows consumers to free multiple regulator
3621 * clients in a single API call.
3623 void regulator_bulk_free(int num_consumers
,
3624 struct regulator_bulk_data
*consumers
)
3628 for (i
= 0; i
< num_consumers
; i
++) {
3629 regulator_put(consumers
[i
].consumer
);
3630 consumers
[i
].consumer
= NULL
;
3633 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3636 * regulator_notifier_call_chain - call regulator event notifier
3637 * @rdev: regulator source
3638 * @event: notifier block
3639 * @data: callback-specific data.
3641 * Called by regulator drivers to notify clients a regulator event has
3642 * occurred. We also notify regulator clients downstream.
3643 * Note lock must be held by caller.
3645 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3646 unsigned long event
, void *data
)
3648 lockdep_assert_held_once(&rdev
->mutex
);
3650 _notifier_call_chain(rdev
, event
, data
);
3654 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3657 * regulator_mode_to_status - convert a regulator mode into a status
3659 * @mode: Mode to convert
3661 * Convert a regulator mode into a status.
3663 int regulator_mode_to_status(unsigned int mode
)
3666 case REGULATOR_MODE_FAST
:
3667 return REGULATOR_STATUS_FAST
;
3668 case REGULATOR_MODE_NORMAL
:
3669 return REGULATOR_STATUS_NORMAL
;
3670 case REGULATOR_MODE_IDLE
:
3671 return REGULATOR_STATUS_IDLE
;
3672 case REGULATOR_MODE_STANDBY
:
3673 return REGULATOR_STATUS_STANDBY
;
3675 return REGULATOR_STATUS_UNDEFINED
;
3678 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3680 static struct attribute
*regulator_dev_attrs
[] = {
3681 &dev_attr_name
.attr
,
3682 &dev_attr_num_users
.attr
,
3683 &dev_attr_type
.attr
,
3684 &dev_attr_microvolts
.attr
,
3685 &dev_attr_microamps
.attr
,
3686 &dev_attr_opmode
.attr
,
3687 &dev_attr_state
.attr
,
3688 &dev_attr_status
.attr
,
3689 &dev_attr_bypass
.attr
,
3690 &dev_attr_requested_microamps
.attr
,
3691 &dev_attr_min_microvolts
.attr
,
3692 &dev_attr_max_microvolts
.attr
,
3693 &dev_attr_min_microamps
.attr
,
3694 &dev_attr_max_microamps
.attr
,
3695 &dev_attr_suspend_standby_state
.attr
,
3696 &dev_attr_suspend_mem_state
.attr
,
3697 &dev_attr_suspend_disk_state
.attr
,
3698 &dev_attr_suspend_standby_microvolts
.attr
,
3699 &dev_attr_suspend_mem_microvolts
.attr
,
3700 &dev_attr_suspend_disk_microvolts
.attr
,
3701 &dev_attr_suspend_standby_mode
.attr
,
3702 &dev_attr_suspend_mem_mode
.attr
,
3703 &dev_attr_suspend_disk_mode
.attr
,
3708 * To avoid cluttering sysfs (and memory) with useless state, only
3709 * create attributes that can be meaningfully displayed.
3711 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
3712 struct attribute
*attr
, int idx
)
3714 struct device
*dev
= kobj_to_dev(kobj
);
3715 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
3716 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3717 umode_t mode
= attr
->mode
;
3719 /* these three are always present */
3720 if (attr
== &dev_attr_name
.attr
||
3721 attr
== &dev_attr_num_users
.attr
||
3722 attr
== &dev_attr_type
.attr
)
3725 /* some attributes need specific methods to be displayed */
3726 if (attr
== &dev_attr_microvolts
.attr
) {
3727 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3728 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3729 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3730 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
3735 if (attr
== &dev_attr_microamps
.attr
)
3736 return ops
->get_current_limit
? mode
: 0;
3738 if (attr
== &dev_attr_opmode
.attr
)
3739 return ops
->get_mode
? mode
: 0;
3741 if (attr
== &dev_attr_state
.attr
)
3742 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
3744 if (attr
== &dev_attr_status
.attr
)
3745 return ops
->get_status
? mode
: 0;
3747 if (attr
== &dev_attr_bypass
.attr
)
3748 return ops
->get_bypass
? mode
: 0;
3750 /* some attributes are type-specific */
3751 if (attr
== &dev_attr_requested_microamps
.attr
)
3752 return rdev
->desc
->type
== REGULATOR_CURRENT
? mode
: 0;
3754 /* constraints need specific supporting methods */
3755 if (attr
== &dev_attr_min_microvolts
.attr
||
3756 attr
== &dev_attr_max_microvolts
.attr
)
3757 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
3759 if (attr
== &dev_attr_min_microamps
.attr
||
3760 attr
== &dev_attr_max_microamps
.attr
)
3761 return ops
->set_current_limit
? mode
: 0;
3763 if (attr
== &dev_attr_suspend_standby_state
.attr
||
3764 attr
== &dev_attr_suspend_mem_state
.attr
||
3765 attr
== &dev_attr_suspend_disk_state
.attr
)
3768 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
3769 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
3770 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
3771 return ops
->set_suspend_voltage
? mode
: 0;
3773 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
3774 attr
== &dev_attr_suspend_mem_mode
.attr
||
3775 attr
== &dev_attr_suspend_disk_mode
.attr
)
3776 return ops
->set_suspend_mode
? mode
: 0;
3781 static const struct attribute_group regulator_dev_group
= {
3782 .attrs
= regulator_dev_attrs
,
3783 .is_visible
= regulator_attr_is_visible
,
3786 static const struct attribute_group
*regulator_dev_groups
[] = {
3787 ®ulator_dev_group
,
3791 static void regulator_dev_release(struct device
*dev
)
3793 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
3795 kfree(rdev
->constraints
);
3796 of_node_put(rdev
->dev
.of_node
);
3800 static struct class regulator_class
= {
3801 .name
= "regulator",
3802 .dev_release
= regulator_dev_release
,
3803 .dev_groups
= regulator_dev_groups
,
3806 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3808 struct device
*parent
= rdev
->dev
.parent
;
3809 const char *rname
= rdev_get_name(rdev
);
3810 char name
[NAME_MAX
];
3812 /* Avoid duplicate debugfs directory names */
3813 if (parent
&& rname
== rdev
->desc
->name
) {
3814 snprintf(name
, sizeof(name
), "%s-%s", dev_name(parent
),
3819 rdev
->debugfs
= debugfs_create_dir(rname
, debugfs_root
);
3820 if (!rdev
->debugfs
) {
3821 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3825 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3827 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3829 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3830 &rdev
->bypass_count
);
3834 * regulator_register - register regulator
3835 * @regulator_desc: regulator to register
3836 * @cfg: runtime configuration for regulator
3838 * Called by regulator drivers to register a regulator.
3839 * Returns a valid pointer to struct regulator_dev on success
3840 * or an ERR_PTR() on error.
3842 struct regulator_dev
*
3843 regulator_register(const struct regulator_desc
*regulator_desc
,
3844 const struct regulator_config
*cfg
)
3846 const struct regulation_constraints
*constraints
= NULL
;
3847 const struct regulator_init_data
*init_data
;
3848 struct regulator_config
*config
= NULL
;
3849 static atomic_t regulator_no
= ATOMIC_INIT(-1);
3850 struct regulator_dev
*rdev
;
3854 if (regulator_desc
== NULL
|| cfg
== NULL
)
3855 return ERR_PTR(-EINVAL
);
3860 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3861 return ERR_PTR(-EINVAL
);
3863 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3864 regulator_desc
->type
!= REGULATOR_CURRENT
)
3865 return ERR_PTR(-EINVAL
);
3867 /* Only one of each should be implemented */
3868 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3869 regulator_desc
->ops
->get_voltage_sel
);
3870 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3871 regulator_desc
->ops
->set_voltage_sel
);
3873 /* If we're using selectors we must implement list_voltage. */
3874 if (regulator_desc
->ops
->get_voltage_sel
&&
3875 !regulator_desc
->ops
->list_voltage
) {
3876 return ERR_PTR(-EINVAL
);
3878 if (regulator_desc
->ops
->set_voltage_sel
&&
3879 !regulator_desc
->ops
->list_voltage
) {
3880 return ERR_PTR(-EINVAL
);
3883 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3885 return ERR_PTR(-ENOMEM
);
3888 * Duplicate the config so the driver could override it after
3889 * parsing init data.
3891 config
= kmemdup(cfg
, sizeof(*cfg
), GFP_KERNEL
);
3892 if (config
== NULL
) {
3894 return ERR_PTR(-ENOMEM
);
3897 init_data
= regulator_of_get_init_data(dev
, regulator_desc
, config
,
3898 &rdev
->dev
.of_node
);
3900 init_data
= config
->init_data
;
3901 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
3904 mutex_lock(®ulator_list_mutex
);
3906 mutex_init(&rdev
->mutex
);
3907 rdev
->reg_data
= config
->driver_data
;
3908 rdev
->owner
= regulator_desc
->owner
;
3909 rdev
->desc
= regulator_desc
;
3911 rdev
->regmap
= config
->regmap
;
3912 else if (dev_get_regmap(dev
, NULL
))
3913 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3914 else if (dev
->parent
)
3915 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3916 INIT_LIST_HEAD(&rdev
->consumer_list
);
3917 INIT_LIST_HEAD(&rdev
->list
);
3918 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3919 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3921 /* preform any regulator specific init */
3922 if (init_data
&& init_data
->regulator_init
) {
3923 ret
= init_data
->regulator_init(rdev
->reg_data
);
3928 if ((config
->ena_gpio
|| config
->ena_gpio_initialized
) &&
3929 gpio_is_valid(config
->ena_gpio
)) {
3930 ret
= regulator_ena_gpio_request(rdev
, config
);
3932 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3933 config
->ena_gpio
, ret
);
3938 /* register with sysfs */
3939 rdev
->dev
.class = ®ulator_class
;
3940 rdev
->dev
.parent
= dev
;
3941 dev_set_name(&rdev
->dev
, "regulator.%lu",
3942 (unsigned long) atomic_inc_return(®ulator_no
));
3943 ret
= device_register(&rdev
->dev
);
3945 put_device(&rdev
->dev
);
3949 dev_set_drvdata(&rdev
->dev
, rdev
);
3951 /* set regulator constraints */
3953 constraints
= &init_data
->constraints
;
3955 ret
= set_machine_constraints(rdev
, constraints
);
3959 if (init_data
&& init_data
->supply_regulator
)
3960 rdev
->supply_name
= init_data
->supply_regulator
;
3961 else if (regulator_desc
->supply_name
)
3962 rdev
->supply_name
= regulator_desc
->supply_name
;
3964 /* add consumers devices */
3966 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3967 ret
= set_consumer_device_supply(rdev
,
3968 init_data
->consumer_supplies
[i
].dev_name
,
3969 init_data
->consumer_supplies
[i
].supply
);
3971 dev_err(dev
, "Failed to set supply %s\n",
3972 init_data
->consumer_supplies
[i
].supply
);
3973 goto unset_supplies
;
3978 rdev_init_debugfs(rdev
);
3980 mutex_unlock(®ulator_list_mutex
);
3985 unset_regulator_supplies(rdev
);
3988 regulator_ena_gpio_free(rdev
);
3989 device_unregister(&rdev
->dev
);
3990 /* device core frees rdev */
3991 rdev
= ERR_PTR(ret
);
3995 regulator_ena_gpio_free(rdev
);
3998 rdev
= ERR_PTR(ret
);
4001 EXPORT_SYMBOL_GPL(regulator_register
);
4004 * regulator_unregister - unregister regulator
4005 * @rdev: regulator to unregister
4007 * Called by regulator drivers to unregister a regulator.
4009 void regulator_unregister(struct regulator_dev
*rdev
)
4015 while (rdev
->use_count
--)
4016 regulator_disable(rdev
->supply
);
4017 regulator_put(rdev
->supply
);
4019 mutex_lock(®ulator_list_mutex
);
4020 debugfs_remove_recursive(rdev
->debugfs
);
4021 flush_work(&rdev
->disable_work
.work
);
4022 WARN_ON(rdev
->open_count
);
4023 unset_regulator_supplies(rdev
);
4024 list_del(&rdev
->list
);
4025 mutex_unlock(®ulator_list_mutex
);
4026 regulator_ena_gpio_free(rdev
);
4027 device_unregister(&rdev
->dev
);
4029 EXPORT_SYMBOL_GPL(regulator_unregister
);
4031 static int _regulator_suspend_prepare(struct device
*dev
, void *data
)
4033 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4034 const suspend_state_t
*state
= data
;
4037 mutex_lock(&rdev
->mutex
);
4038 ret
= suspend_prepare(rdev
, *state
);
4039 mutex_unlock(&rdev
->mutex
);
4045 * regulator_suspend_prepare - prepare regulators for system wide suspend
4046 * @state: system suspend state
4048 * Configure each regulator with it's suspend operating parameters for state.
4049 * This will usually be called by machine suspend code prior to supending.
4051 int regulator_suspend_prepare(suspend_state_t state
)
4053 /* ON is handled by regulator active state */
4054 if (state
== PM_SUSPEND_ON
)
4057 return class_for_each_device(®ulator_class
, NULL
, &state
,
4058 _regulator_suspend_prepare
);
4060 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
4062 static int _regulator_suspend_finish(struct device
*dev
, void *data
)
4064 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4067 mutex_lock(&rdev
->mutex
);
4068 if (rdev
->use_count
> 0 || rdev
->constraints
->always_on
) {
4069 if (!_regulator_is_enabled(rdev
)) {
4070 ret
= _regulator_do_enable(rdev
);
4073 "Failed to resume regulator %d\n",
4077 if (!have_full_constraints())
4079 if (!_regulator_is_enabled(rdev
))
4082 ret
= _regulator_do_disable(rdev
);
4084 dev_err(dev
, "Failed to suspend regulator %d\n", ret
);
4087 mutex_unlock(&rdev
->mutex
);
4089 /* Keep processing regulators in spite of any errors */
4094 * regulator_suspend_finish - resume regulators from system wide suspend
4096 * Turn on regulators that might be turned off by regulator_suspend_prepare
4097 * and that should be turned on according to the regulators properties.
4099 int regulator_suspend_finish(void)
4101 return class_for_each_device(®ulator_class
, NULL
, NULL
,
4102 _regulator_suspend_finish
);
4104 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
4107 * regulator_has_full_constraints - the system has fully specified constraints
4109 * Calling this function will cause the regulator API to disable all
4110 * regulators which have a zero use count and don't have an always_on
4111 * constraint in a late_initcall.
4113 * The intention is that this will become the default behaviour in a
4114 * future kernel release so users are encouraged to use this facility
4117 void regulator_has_full_constraints(void)
4119 has_full_constraints
= 1;
4121 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
4124 * rdev_get_drvdata - get rdev regulator driver data
4127 * Get rdev regulator driver private data. This call can be used in the
4128 * regulator driver context.
4130 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
4132 return rdev
->reg_data
;
4134 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
4137 * regulator_get_drvdata - get regulator driver data
4138 * @regulator: regulator
4140 * Get regulator driver private data. This call can be used in the consumer
4141 * driver context when non API regulator specific functions need to be called.
4143 void *regulator_get_drvdata(struct regulator
*regulator
)
4145 return regulator
->rdev
->reg_data
;
4147 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
4150 * regulator_set_drvdata - set regulator driver data
4151 * @regulator: regulator
4154 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
4156 regulator
->rdev
->reg_data
= data
;
4158 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
4161 * regulator_get_id - get regulator ID
4164 int rdev_get_id(struct regulator_dev
*rdev
)
4166 return rdev
->desc
->id
;
4168 EXPORT_SYMBOL_GPL(rdev_get_id
);
4170 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
4174 EXPORT_SYMBOL_GPL(rdev_get_dev
);
4176 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
4178 return reg_init_data
->driver_data
;
4180 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
4182 #ifdef CONFIG_DEBUG_FS
4183 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
4184 size_t count
, loff_t
*ppos
)
4186 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
4187 ssize_t len
, ret
= 0;
4188 struct regulator_map
*map
;
4193 list_for_each_entry(map
, ®ulator_map_list
, list
) {
4194 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
4196 rdev_get_name(map
->regulator
), map
->dev_name
,
4200 if (ret
> PAGE_SIZE
) {
4206 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
4214 static const struct file_operations supply_map_fops
= {
4215 #ifdef CONFIG_DEBUG_FS
4216 .read
= supply_map_read_file
,
4217 .llseek
= default_llseek
,
4221 #ifdef CONFIG_DEBUG_FS
4222 struct summary_data
{
4224 struct regulator_dev
*parent
;
4228 static void regulator_summary_show_subtree(struct seq_file
*s
,
4229 struct regulator_dev
*rdev
,
4232 static int regulator_summary_show_children(struct device
*dev
, void *data
)
4234 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4235 struct summary_data
*summary_data
= data
;
4237 if (rdev
->supply
&& rdev
->supply
->rdev
== summary_data
->parent
)
4238 regulator_summary_show_subtree(summary_data
->s
, rdev
,
4239 summary_data
->level
+ 1);
4244 static void regulator_summary_show_subtree(struct seq_file
*s
,
4245 struct regulator_dev
*rdev
,
4248 struct regulation_constraints
*c
;
4249 struct regulator
*consumer
;
4250 struct summary_data summary_data
;
4255 seq_printf(s
, "%*s%-*s %3d %4d %6d ",
4257 30 - level
* 3, rdev_get_name(rdev
),
4258 rdev
->use_count
, rdev
->open_count
, rdev
->bypass_count
);
4260 seq_printf(s
, "%5dmV ", _regulator_get_voltage(rdev
) / 1000);
4261 seq_printf(s
, "%5dmA ", _regulator_get_current_limit(rdev
) / 1000);
4263 c
= rdev
->constraints
;
4265 switch (rdev
->desc
->type
) {
4266 case REGULATOR_VOLTAGE
:
4267 seq_printf(s
, "%5dmV %5dmV ",
4268 c
->min_uV
/ 1000, c
->max_uV
/ 1000);
4270 case REGULATOR_CURRENT
:
4271 seq_printf(s
, "%5dmA %5dmA ",
4272 c
->min_uA
/ 1000, c
->max_uA
/ 1000);
4279 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
) {
4280 if (consumer
->dev
->class == ®ulator_class
)
4283 seq_printf(s
, "%*s%-*s ",
4284 (level
+ 1) * 3 + 1, "",
4285 30 - (level
+ 1) * 3, dev_name(consumer
->dev
));
4287 switch (rdev
->desc
->type
) {
4288 case REGULATOR_VOLTAGE
:
4289 seq_printf(s
, "%37dmV %5dmV",
4290 consumer
->min_uV
/ 1000,
4291 consumer
->max_uV
/ 1000);
4293 case REGULATOR_CURRENT
:
4301 summary_data
.level
= level
;
4302 summary_data
.parent
= rdev
;
4304 class_for_each_device(®ulator_class
, NULL
, &summary_data
,
4305 regulator_summary_show_children
);
4308 static int regulator_summary_show_roots(struct device
*dev
, void *data
)
4310 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4311 struct seq_file
*s
= data
;
4314 regulator_summary_show_subtree(s
, rdev
, 0);
4319 static int regulator_summary_show(struct seq_file
*s
, void *data
)
4321 seq_puts(s
, " regulator use open bypass voltage current min max\n");
4322 seq_puts(s
, "-------------------------------------------------------------------------------\n");
4324 class_for_each_device(®ulator_class
, NULL
, s
,
4325 regulator_summary_show_roots
);
4330 static int regulator_summary_open(struct inode
*inode
, struct file
*file
)
4332 return single_open(file
, regulator_summary_show
, inode
->i_private
);
4336 static const struct file_operations regulator_summary_fops
= {
4337 #ifdef CONFIG_DEBUG_FS
4338 .open
= regulator_summary_open
,
4340 .llseek
= seq_lseek
,
4341 .release
= single_release
,
4345 static int __init
regulator_init(void)
4349 ret
= class_register(®ulator_class
);
4351 debugfs_root
= debugfs_create_dir("regulator", NULL
);
4353 pr_warn("regulator: Failed to create debugfs directory\n");
4355 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
4358 debugfs_create_file("regulator_summary", 0444, debugfs_root
,
4359 NULL
, ®ulator_summary_fops
);
4361 regulator_dummy_init();
4366 /* init early to allow our consumers to complete system booting */
4367 core_initcall(regulator_init
);
4369 static int __init
regulator_late_cleanup(struct device
*dev
, void *data
)
4371 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4372 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
4373 struct regulation_constraints
*c
= rdev
->constraints
;
4376 if (c
&& c
->always_on
)
4379 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
))
4382 mutex_lock(&rdev
->mutex
);
4384 if (rdev
->use_count
)
4387 /* If we can't read the status assume it's on. */
4388 if (ops
->is_enabled
)
4389 enabled
= ops
->is_enabled(rdev
);
4396 if (have_full_constraints()) {
4397 /* We log since this may kill the system if it goes
4399 rdev_info(rdev
, "disabling\n");
4400 ret
= _regulator_do_disable(rdev
);
4402 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4404 /* The intention is that in future we will
4405 * assume that full constraints are provided
4406 * so warn even if we aren't going to do
4409 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4413 mutex_unlock(&rdev
->mutex
);
4418 static int __init
regulator_init_complete(void)
4421 * Since DT doesn't provide an idiomatic mechanism for
4422 * enabling full constraints and since it's much more natural
4423 * with DT to provide them just assume that a DT enabled
4424 * system has full constraints.
4426 if (of_have_populated_dt())
4427 has_full_constraints
= true;
4429 /* If we have a full configuration then disable any regulators
4430 * we have permission to change the status for and which are
4431 * not in use or always_on. This is effectively the default
4432 * for DT and ACPI as they have full constraints.
4434 class_for_each_device(®ulator_class
, NULL
, NULL
,
4435 regulator_late_cleanup
);
4439 late_initcall_sync(regulator_init_complete
);