2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
27 #include <linux/gpio/consumer.h>
29 #include <linux/regmap.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/module.h>
36 #define CREATE_TRACE_POINTS
37 #include <trace/events/regulator.h>
42 #define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 #define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
53 static DEFINE_MUTEX(regulator_list_mutex
);
54 static LIST_HEAD(regulator_list
);
55 static LIST_HEAD(regulator_map_list
);
56 static LIST_HEAD(regulator_ena_gpio_list
);
57 static LIST_HEAD(regulator_supply_alias_list
);
58 static bool has_full_constraints
;
60 static struct dentry
*debugfs_root
;
63 * struct regulator_map
65 * Used to provide symbolic supply names to devices.
67 struct regulator_map
{
68 struct list_head list
;
69 const char *dev_name
; /* The dev_name() for the consumer */
71 struct regulator_dev
*regulator
;
75 * struct regulator_enable_gpio
77 * Management for shared enable GPIO pin
79 struct regulator_enable_gpio
{
80 struct list_head list
;
81 struct gpio_desc
*gpiod
;
82 u32 enable_count
; /* a number of enabled shared GPIO */
83 u32 request_count
; /* a number of requested shared GPIO */
84 unsigned int ena_gpio_invert
:1;
88 * struct regulator_supply_alias
90 * Used to map lookups for a supply onto an alternative device.
92 struct regulator_supply_alias
{
93 struct list_head list
;
94 struct device
*src_dev
;
95 const char *src_supply
;
96 struct device
*alias_dev
;
97 const char *alias_supply
;
100 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
101 static int _regulator_disable(struct regulator_dev
*rdev
);
102 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
103 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
104 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
105 static int _notifier_call_chain(struct regulator_dev
*rdev
,
106 unsigned long event
, void *data
);
107 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
108 int min_uV
, int max_uV
);
109 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
111 const char *supply_name
);
113 static const char *rdev_get_name(struct regulator_dev
*rdev
)
115 if (rdev
->constraints
&& rdev
->constraints
->name
)
116 return rdev
->constraints
->name
;
117 else if (rdev
->desc
->name
)
118 return rdev
->desc
->name
;
123 static bool have_full_constraints(void)
125 return has_full_constraints
|| of_have_populated_dt();
129 * of_get_regulator - get a regulator device node based on supply name
130 * @dev: Device pointer for the consumer (of regulator) device
131 * @supply: regulator supply name
133 * Extract the regulator device node corresponding to the supply name.
134 * returns the device node corresponding to the regulator if found, else
137 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
139 struct device_node
*regnode
= NULL
;
140 char prop_name
[32]; /* 32 is max size of property name */
142 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
144 snprintf(prop_name
, 32, "%s-supply", supply
);
145 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
148 dev_dbg(dev
, "Looking up %s property in node %s failed",
149 prop_name
, dev
->of_node
->full_name
);
155 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
157 if (!rdev
->constraints
)
160 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
166 /* Platform voltage constraint check */
167 static int regulator_check_voltage(struct regulator_dev
*rdev
,
168 int *min_uV
, int *max_uV
)
170 BUG_ON(*min_uV
> *max_uV
);
172 if (!rdev
->constraints
) {
173 rdev_err(rdev
, "no constraints\n");
176 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
177 rdev_err(rdev
, "operation not allowed\n");
181 if (*max_uV
> rdev
->constraints
->max_uV
)
182 *max_uV
= rdev
->constraints
->max_uV
;
183 if (*min_uV
< rdev
->constraints
->min_uV
)
184 *min_uV
= rdev
->constraints
->min_uV
;
186 if (*min_uV
> *max_uV
) {
187 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
195 /* Make sure we select a voltage that suits the needs of all
196 * regulator consumers
198 static int regulator_check_consumers(struct regulator_dev
*rdev
,
199 int *min_uV
, int *max_uV
)
201 struct regulator
*regulator
;
203 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
205 * Assume consumers that didn't say anything are OK
206 * with anything in the constraint range.
208 if (!regulator
->min_uV
&& !regulator
->max_uV
)
211 if (*max_uV
> regulator
->max_uV
)
212 *max_uV
= regulator
->max_uV
;
213 if (*min_uV
< regulator
->min_uV
)
214 *min_uV
= regulator
->min_uV
;
217 if (*min_uV
> *max_uV
) {
218 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
226 /* current constraint check */
227 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
228 int *min_uA
, int *max_uA
)
230 BUG_ON(*min_uA
> *max_uA
);
232 if (!rdev
->constraints
) {
233 rdev_err(rdev
, "no constraints\n");
236 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
237 rdev_err(rdev
, "operation not allowed\n");
241 if (*max_uA
> rdev
->constraints
->max_uA
)
242 *max_uA
= rdev
->constraints
->max_uA
;
243 if (*min_uA
< rdev
->constraints
->min_uA
)
244 *min_uA
= rdev
->constraints
->min_uA
;
246 if (*min_uA
> *max_uA
) {
247 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
255 /* operating mode constraint check */
256 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
259 case REGULATOR_MODE_FAST
:
260 case REGULATOR_MODE_NORMAL
:
261 case REGULATOR_MODE_IDLE
:
262 case REGULATOR_MODE_STANDBY
:
265 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
269 if (!rdev
->constraints
) {
270 rdev_err(rdev
, "no constraints\n");
273 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
274 rdev_err(rdev
, "operation not allowed\n");
278 /* The modes are bitmasks, the most power hungry modes having
279 * the lowest values. If the requested mode isn't supported
280 * try higher modes. */
282 if (rdev
->constraints
->valid_modes_mask
& *mode
)
290 /* dynamic regulator mode switching constraint check */
291 static int regulator_check_drms(struct regulator_dev
*rdev
)
293 if (!rdev
->constraints
) {
294 rdev_err(rdev
, "no constraints\n");
297 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
298 rdev_err(rdev
, "operation not allowed\n");
304 static ssize_t
regulator_uV_show(struct device
*dev
,
305 struct device_attribute
*attr
, char *buf
)
307 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
310 mutex_lock(&rdev
->mutex
);
311 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
312 mutex_unlock(&rdev
->mutex
);
316 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
318 static ssize_t
regulator_uA_show(struct device
*dev
,
319 struct device_attribute
*attr
, char *buf
)
321 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
323 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
325 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
327 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
330 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
332 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
334 static DEVICE_ATTR_RO(name
);
336 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
339 case REGULATOR_MODE_FAST
:
340 return sprintf(buf
, "fast\n");
341 case REGULATOR_MODE_NORMAL
:
342 return sprintf(buf
, "normal\n");
343 case REGULATOR_MODE_IDLE
:
344 return sprintf(buf
, "idle\n");
345 case REGULATOR_MODE_STANDBY
:
346 return sprintf(buf
, "standby\n");
348 return sprintf(buf
, "unknown\n");
351 static ssize_t
regulator_opmode_show(struct device
*dev
,
352 struct device_attribute
*attr
, char *buf
)
354 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
356 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
358 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
360 static ssize_t
regulator_print_state(char *buf
, int state
)
363 return sprintf(buf
, "enabled\n");
365 return sprintf(buf
, "disabled\n");
367 return sprintf(buf
, "unknown\n");
370 static ssize_t
regulator_state_show(struct device
*dev
,
371 struct device_attribute
*attr
, char *buf
)
373 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
376 mutex_lock(&rdev
->mutex
);
377 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
378 mutex_unlock(&rdev
->mutex
);
382 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
384 static ssize_t
regulator_status_show(struct device
*dev
,
385 struct device_attribute
*attr
, char *buf
)
387 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
391 status
= rdev
->desc
->ops
->get_status(rdev
);
396 case REGULATOR_STATUS_OFF
:
399 case REGULATOR_STATUS_ON
:
402 case REGULATOR_STATUS_ERROR
:
405 case REGULATOR_STATUS_FAST
:
408 case REGULATOR_STATUS_NORMAL
:
411 case REGULATOR_STATUS_IDLE
:
414 case REGULATOR_STATUS_STANDBY
:
417 case REGULATOR_STATUS_BYPASS
:
420 case REGULATOR_STATUS_UNDEFINED
:
427 return sprintf(buf
, "%s\n", label
);
429 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
431 static ssize_t
regulator_min_uA_show(struct device
*dev
,
432 struct device_attribute
*attr
, char *buf
)
434 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
436 if (!rdev
->constraints
)
437 return sprintf(buf
, "constraint not defined\n");
439 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
441 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
443 static ssize_t
regulator_max_uA_show(struct device
*dev
,
444 struct device_attribute
*attr
, char *buf
)
446 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
448 if (!rdev
->constraints
)
449 return sprintf(buf
, "constraint not defined\n");
451 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
453 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
455 static ssize_t
regulator_min_uV_show(struct device
*dev
,
456 struct device_attribute
*attr
, char *buf
)
458 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
460 if (!rdev
->constraints
)
461 return sprintf(buf
, "constraint not defined\n");
463 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
465 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
467 static ssize_t
regulator_max_uV_show(struct device
*dev
,
468 struct device_attribute
*attr
, char *buf
)
470 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
472 if (!rdev
->constraints
)
473 return sprintf(buf
, "constraint not defined\n");
475 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
477 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
479 static ssize_t
regulator_total_uA_show(struct device
*dev
,
480 struct device_attribute
*attr
, char *buf
)
482 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
483 struct regulator
*regulator
;
486 mutex_lock(&rdev
->mutex
);
487 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
488 uA
+= regulator
->uA_load
;
489 mutex_unlock(&rdev
->mutex
);
490 return sprintf(buf
, "%d\n", uA
);
492 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
494 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
497 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
498 return sprintf(buf
, "%d\n", rdev
->use_count
);
500 static DEVICE_ATTR_RO(num_users
);
502 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
505 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
507 switch (rdev
->desc
->type
) {
508 case REGULATOR_VOLTAGE
:
509 return sprintf(buf
, "voltage\n");
510 case REGULATOR_CURRENT
:
511 return sprintf(buf
, "current\n");
513 return sprintf(buf
, "unknown\n");
515 static DEVICE_ATTR_RO(type
);
517 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
518 struct device_attribute
*attr
, char *buf
)
520 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
522 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
524 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
525 regulator_suspend_mem_uV_show
, NULL
);
527 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
528 struct device_attribute
*attr
, char *buf
)
530 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
532 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
534 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
535 regulator_suspend_disk_uV_show
, NULL
);
537 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
538 struct device_attribute
*attr
, char *buf
)
540 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
542 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
544 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
545 regulator_suspend_standby_uV_show
, NULL
);
547 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
548 struct device_attribute
*attr
, char *buf
)
550 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
552 return regulator_print_opmode(buf
,
553 rdev
->constraints
->state_mem
.mode
);
555 static DEVICE_ATTR(suspend_mem_mode
, 0444,
556 regulator_suspend_mem_mode_show
, NULL
);
558 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
559 struct device_attribute
*attr
, char *buf
)
561 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
563 return regulator_print_opmode(buf
,
564 rdev
->constraints
->state_disk
.mode
);
566 static DEVICE_ATTR(suspend_disk_mode
, 0444,
567 regulator_suspend_disk_mode_show
, NULL
);
569 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
570 struct device_attribute
*attr
, char *buf
)
572 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
574 return regulator_print_opmode(buf
,
575 rdev
->constraints
->state_standby
.mode
);
577 static DEVICE_ATTR(suspend_standby_mode
, 0444,
578 regulator_suspend_standby_mode_show
, NULL
);
580 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
581 struct device_attribute
*attr
, char *buf
)
583 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
585 return regulator_print_state(buf
,
586 rdev
->constraints
->state_mem
.enabled
);
588 static DEVICE_ATTR(suspend_mem_state
, 0444,
589 regulator_suspend_mem_state_show
, NULL
);
591 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
592 struct device_attribute
*attr
, char *buf
)
594 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
596 return regulator_print_state(buf
,
597 rdev
->constraints
->state_disk
.enabled
);
599 static DEVICE_ATTR(suspend_disk_state
, 0444,
600 regulator_suspend_disk_state_show
, NULL
);
602 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
603 struct device_attribute
*attr
, char *buf
)
605 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
607 return regulator_print_state(buf
,
608 rdev
->constraints
->state_standby
.enabled
);
610 static DEVICE_ATTR(suspend_standby_state
, 0444,
611 regulator_suspend_standby_state_show
, NULL
);
613 static ssize_t
regulator_bypass_show(struct device
*dev
,
614 struct device_attribute
*attr
, char *buf
)
616 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
621 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
630 return sprintf(buf
, "%s\n", report
);
632 static DEVICE_ATTR(bypass
, 0444,
633 regulator_bypass_show
, NULL
);
635 /* Calculate the new optimum regulator operating mode based on the new total
636 * consumer load. All locks held by caller */
637 static int drms_uA_update(struct regulator_dev
*rdev
)
639 struct regulator
*sibling
;
640 int current_uA
= 0, output_uV
, input_uV
, err
;
644 * first check to see if we can set modes at all, otherwise just
645 * tell the consumer everything is OK.
647 err
= regulator_check_drms(rdev
);
651 if (!rdev
->desc
->ops
->get_optimum_mode
&&
652 !rdev
->desc
->ops
->set_load
)
655 if (!rdev
->desc
->ops
->set_mode
&&
656 !rdev
->desc
->ops
->set_load
)
659 /* get output voltage */
660 output_uV
= _regulator_get_voltage(rdev
);
661 if (output_uV
<= 0) {
662 rdev_err(rdev
, "invalid output voltage found\n");
666 /* get input voltage */
669 input_uV
= regulator_get_voltage(rdev
->supply
);
671 input_uV
= rdev
->constraints
->input_uV
;
673 rdev_err(rdev
, "invalid input voltage found\n");
677 /* calc total requested load */
678 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
679 current_uA
+= sibling
->uA_load
;
681 current_uA
+= rdev
->constraints
->system_load
;
683 if (rdev
->desc
->ops
->set_load
) {
684 /* set the optimum mode for our new total regulator load */
685 err
= rdev
->desc
->ops
->set_load(rdev
, current_uA
);
687 rdev_err(rdev
, "failed to set load %d\n", current_uA
);
689 /* now get the optimum mode for our new total regulator load */
690 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
691 output_uV
, current_uA
);
693 /* check the new mode is allowed */
694 err
= regulator_mode_constrain(rdev
, &mode
);
696 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
697 current_uA
, input_uV
, output_uV
);
701 err
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
703 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
709 static int suspend_set_state(struct regulator_dev
*rdev
,
710 struct regulator_state
*rstate
)
714 /* If we have no suspend mode configration don't set anything;
715 * only warn if the driver implements set_suspend_voltage or
716 * set_suspend_mode callback.
718 if (!rstate
->enabled
&& !rstate
->disabled
) {
719 if (rdev
->desc
->ops
->set_suspend_voltage
||
720 rdev
->desc
->ops
->set_suspend_mode
)
721 rdev_warn(rdev
, "No configuration\n");
725 if (rstate
->enabled
&& rstate
->disabled
) {
726 rdev_err(rdev
, "invalid configuration\n");
730 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
731 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
732 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
733 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
734 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
738 rdev_err(rdev
, "failed to enabled/disable\n");
742 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
743 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
745 rdev_err(rdev
, "failed to set voltage\n");
750 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
751 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
753 rdev_err(rdev
, "failed to set mode\n");
760 /* locks held by caller */
761 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
763 if (!rdev
->constraints
)
767 case PM_SUSPEND_STANDBY
:
768 return suspend_set_state(rdev
,
769 &rdev
->constraints
->state_standby
);
771 return suspend_set_state(rdev
,
772 &rdev
->constraints
->state_mem
);
774 return suspend_set_state(rdev
,
775 &rdev
->constraints
->state_disk
);
781 static void print_constraints(struct regulator_dev
*rdev
)
783 struct regulation_constraints
*constraints
= rdev
->constraints
;
785 size_t len
= sizeof(buf
) - 1;
789 if (constraints
->min_uV
&& constraints
->max_uV
) {
790 if (constraints
->min_uV
== constraints
->max_uV
)
791 count
+= scnprintf(buf
+ count
, len
- count
, "%d mV ",
792 constraints
->min_uV
/ 1000);
794 count
+= scnprintf(buf
+ count
, len
- count
,
796 constraints
->min_uV
/ 1000,
797 constraints
->max_uV
/ 1000);
800 if (!constraints
->min_uV
||
801 constraints
->min_uV
!= constraints
->max_uV
) {
802 ret
= _regulator_get_voltage(rdev
);
804 count
+= scnprintf(buf
+ count
, len
- count
,
805 "at %d mV ", ret
/ 1000);
808 if (constraints
->uV_offset
)
809 count
+= scnprintf(buf
+ count
, len
- count
, "%dmV offset ",
810 constraints
->uV_offset
/ 1000);
812 if (constraints
->min_uA
&& constraints
->max_uA
) {
813 if (constraints
->min_uA
== constraints
->max_uA
)
814 count
+= scnprintf(buf
+ count
, len
- count
, "%d mA ",
815 constraints
->min_uA
/ 1000);
817 count
+= scnprintf(buf
+ count
, len
- count
,
819 constraints
->min_uA
/ 1000,
820 constraints
->max_uA
/ 1000);
823 if (!constraints
->min_uA
||
824 constraints
->min_uA
!= constraints
->max_uA
) {
825 ret
= _regulator_get_current_limit(rdev
);
827 count
+= scnprintf(buf
+ count
, len
- count
,
828 "at %d mA ", ret
/ 1000);
831 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
832 count
+= scnprintf(buf
+ count
, len
- count
, "fast ");
833 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
834 count
+= scnprintf(buf
+ count
, len
- count
, "normal ");
835 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
836 count
+= scnprintf(buf
+ count
, len
- count
, "idle ");
837 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
838 count
+= scnprintf(buf
+ count
, len
- count
, "standby");
841 scnprintf(buf
, len
, "no parameters");
843 rdev_dbg(rdev
, "%s\n", buf
);
845 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
846 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
848 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
851 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
852 struct regulation_constraints
*constraints
)
854 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
857 /* do we need to apply the constraint voltage */
858 if (rdev
->constraints
->apply_uV
&&
859 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
860 int current_uV
= _regulator_get_voltage(rdev
);
861 if (current_uV
< 0) {
863 "failed to get the current voltage(%d)\n",
867 if (current_uV
< rdev
->constraints
->min_uV
||
868 current_uV
> rdev
->constraints
->max_uV
) {
869 ret
= _regulator_do_set_voltage(
870 rdev
, rdev
->constraints
->min_uV
,
871 rdev
->constraints
->max_uV
);
874 "failed to apply %duV constraint(%d)\n",
875 rdev
->constraints
->min_uV
, ret
);
881 /* constrain machine-level voltage specs to fit
882 * the actual range supported by this regulator.
884 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
885 int count
= rdev
->desc
->n_voltages
;
887 int min_uV
= INT_MAX
;
888 int max_uV
= INT_MIN
;
889 int cmin
= constraints
->min_uV
;
890 int cmax
= constraints
->max_uV
;
892 /* it's safe to autoconfigure fixed-voltage supplies
893 and the constraints are used by list_voltage. */
894 if (count
== 1 && !cmin
) {
897 constraints
->min_uV
= cmin
;
898 constraints
->max_uV
= cmax
;
901 /* voltage constraints are optional */
902 if ((cmin
== 0) && (cmax
== 0))
905 /* else require explicit machine-level constraints */
906 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
907 rdev_err(rdev
, "invalid voltage constraints\n");
911 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
912 for (i
= 0; i
< count
; i
++) {
915 value
= ops
->list_voltage(rdev
, i
);
919 /* maybe adjust [min_uV..max_uV] */
920 if (value
>= cmin
&& value
< min_uV
)
922 if (value
<= cmax
&& value
> max_uV
)
926 /* final: [min_uV..max_uV] valid iff constraints valid */
927 if (max_uV
< min_uV
) {
929 "unsupportable voltage constraints %u-%uuV\n",
934 /* use regulator's subset of machine constraints */
935 if (constraints
->min_uV
< min_uV
) {
936 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
937 constraints
->min_uV
, min_uV
);
938 constraints
->min_uV
= min_uV
;
940 if (constraints
->max_uV
> max_uV
) {
941 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
942 constraints
->max_uV
, max_uV
);
943 constraints
->max_uV
= max_uV
;
950 static int machine_constraints_current(struct regulator_dev
*rdev
,
951 struct regulation_constraints
*constraints
)
953 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
956 if (!constraints
->min_uA
&& !constraints
->max_uA
)
959 if (constraints
->min_uA
> constraints
->max_uA
) {
960 rdev_err(rdev
, "Invalid current constraints\n");
964 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
965 rdev_warn(rdev
, "Operation of current configuration missing\n");
969 /* Set regulator current in constraints range */
970 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
971 constraints
->max_uA
);
973 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
980 static int _regulator_do_enable(struct regulator_dev
*rdev
);
983 * set_machine_constraints - sets regulator constraints
984 * @rdev: regulator source
985 * @constraints: constraints to apply
987 * Allows platform initialisation code to define and constrain
988 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
989 * Constraints *must* be set by platform code in order for some
990 * regulator operations to proceed i.e. set_voltage, set_current_limit,
993 static int set_machine_constraints(struct regulator_dev
*rdev
,
994 const struct regulation_constraints
*constraints
)
997 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1000 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
1003 rdev
->constraints
= kzalloc(sizeof(*constraints
),
1005 if (!rdev
->constraints
)
1008 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
1012 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
1016 if (rdev
->constraints
->ilim_uA
&& ops
->set_input_current_limit
) {
1017 ret
= ops
->set_input_current_limit(rdev
,
1018 rdev
->constraints
->ilim_uA
);
1020 rdev_err(rdev
, "failed to set input limit\n");
1025 /* do we need to setup our suspend state */
1026 if (rdev
->constraints
->initial_state
) {
1027 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
1029 rdev_err(rdev
, "failed to set suspend state\n");
1034 if (rdev
->constraints
->initial_mode
) {
1035 if (!ops
->set_mode
) {
1036 rdev_err(rdev
, "no set_mode operation\n");
1041 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1043 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1048 /* If the constraints say the regulator should be on at this point
1049 * and we have control then make sure it is enabled.
1051 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
1052 ret
= _regulator_do_enable(rdev
);
1053 if (ret
< 0 && ret
!= -EINVAL
) {
1054 rdev_err(rdev
, "failed to enable\n");
1059 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1060 && ops
->set_ramp_delay
) {
1061 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1063 rdev_err(rdev
, "failed to set ramp_delay\n");
1068 if (rdev
->constraints
->pull_down
&& ops
->set_pull_down
) {
1069 ret
= ops
->set_pull_down(rdev
);
1071 rdev_err(rdev
, "failed to set pull down\n");
1076 if (rdev
->constraints
->soft_start
&& ops
->set_soft_start
) {
1077 ret
= ops
->set_soft_start(rdev
);
1079 rdev_err(rdev
, "failed to set soft start\n");
1084 print_constraints(rdev
);
1087 kfree(rdev
->constraints
);
1088 rdev
->constraints
= NULL
;
1093 * set_supply - set regulator supply regulator
1094 * @rdev: regulator name
1095 * @supply_rdev: supply regulator name
1097 * Called by platform initialisation code to set the supply regulator for this
1098 * regulator. This ensures that a regulators supply will also be enabled by the
1099 * core if it's child is enabled.
1101 static int set_supply(struct regulator_dev
*rdev
,
1102 struct regulator_dev
*supply_rdev
)
1106 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1108 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1109 if (rdev
->supply
== NULL
) {
1113 supply_rdev
->open_count
++;
1119 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1120 * @rdev: regulator source
1121 * @consumer_dev_name: dev_name() string for device supply applies to
1122 * @supply: symbolic name for supply
1124 * Allows platform initialisation code to map physical regulator
1125 * sources to symbolic names for supplies for use by devices. Devices
1126 * should use these symbolic names to request regulators, avoiding the
1127 * need to provide board-specific regulator names as platform data.
1129 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1130 const char *consumer_dev_name
,
1133 struct regulator_map
*node
;
1139 if (consumer_dev_name
!= NULL
)
1144 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1145 if (node
->dev_name
&& consumer_dev_name
) {
1146 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1148 } else if (node
->dev_name
|| consumer_dev_name
) {
1152 if (strcmp(node
->supply
, supply
) != 0)
1155 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1157 dev_name(&node
->regulator
->dev
),
1158 node
->regulator
->desc
->name
,
1160 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1164 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1168 node
->regulator
= rdev
;
1169 node
->supply
= supply
;
1172 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1173 if (node
->dev_name
== NULL
) {
1179 list_add(&node
->list
, ®ulator_map_list
);
1183 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1185 struct regulator_map
*node
, *n
;
1187 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1188 if (rdev
== node
->regulator
) {
1189 list_del(&node
->list
);
1190 kfree(node
->dev_name
);
1196 #define REG_STR_SIZE 64
1198 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1200 const char *supply_name
)
1202 struct regulator
*regulator
;
1203 char buf
[REG_STR_SIZE
];
1206 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1207 if (regulator
== NULL
)
1210 mutex_lock(&rdev
->mutex
);
1211 regulator
->rdev
= rdev
;
1212 list_add(®ulator
->list
, &rdev
->consumer_list
);
1215 regulator
->dev
= dev
;
1217 /* Add a link to the device sysfs entry */
1218 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1219 dev
->kobj
.name
, supply_name
);
1220 if (size
>= REG_STR_SIZE
)
1223 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1224 if (regulator
->supply_name
== NULL
)
1227 err
= sysfs_create_link_nowarn(&rdev
->dev
.kobj
, &dev
->kobj
,
1230 rdev_dbg(rdev
, "could not add device link %s err %d\n",
1231 dev
->kobj
.name
, err
);
1235 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1236 if (regulator
->supply_name
== NULL
)
1240 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1242 if (!regulator
->debugfs
) {
1243 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1245 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1246 ®ulator
->uA_load
);
1247 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1248 ®ulator
->min_uV
);
1249 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1250 ®ulator
->max_uV
);
1254 * Check now if the regulator is an always on regulator - if
1255 * it is then we don't need to do nearly so much work for
1256 * enable/disable calls.
1258 if (!_regulator_can_change_status(rdev
) &&
1259 _regulator_is_enabled(rdev
))
1260 regulator
->always_on
= true;
1262 mutex_unlock(&rdev
->mutex
);
1265 list_del(®ulator
->list
);
1267 mutex_unlock(&rdev
->mutex
);
1271 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1273 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1274 return rdev
->constraints
->enable_time
;
1275 if (!rdev
->desc
->ops
->enable_time
)
1276 return rdev
->desc
->enable_time
;
1277 return rdev
->desc
->ops
->enable_time(rdev
);
1280 static struct regulator_supply_alias
*regulator_find_supply_alias(
1281 struct device
*dev
, const char *supply
)
1283 struct regulator_supply_alias
*map
;
1285 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1286 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1292 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1294 struct regulator_supply_alias
*map
;
1296 map
= regulator_find_supply_alias(*dev
, *supply
);
1298 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1299 *supply
, map
->alias_supply
,
1300 dev_name(map
->alias_dev
));
1301 *dev
= map
->alias_dev
;
1302 *supply
= map
->alias_supply
;
1306 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1310 struct regulator_dev
*r
;
1311 struct device_node
*node
;
1312 struct regulator_map
*map
;
1313 const char *devname
= NULL
;
1315 regulator_supply_alias(&dev
, &supply
);
1317 /* first do a dt based lookup */
1318 if (dev
&& dev
->of_node
) {
1319 node
= of_get_regulator(dev
, supply
);
1321 list_for_each_entry(r
, ®ulator_list
, list
)
1322 if (r
->dev
.parent
&&
1323 node
== r
->dev
.of_node
)
1325 *ret
= -EPROBE_DEFER
;
1329 * If we couldn't even get the node then it's
1330 * not just that the device didn't register
1331 * yet, there's no node and we'll never
1338 /* if not found, try doing it non-dt way */
1340 devname
= dev_name(dev
);
1342 list_for_each_entry(r
, ®ulator_list
, list
)
1343 if (strcmp(rdev_get_name(r
), supply
) == 0)
1346 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1347 /* If the mapping has a device set up it must match */
1348 if (map
->dev_name
&&
1349 (!devname
|| strcmp(map
->dev_name
, devname
)))
1352 if (strcmp(map
->supply
, supply
) == 0)
1353 return map
->regulator
;
1360 static int regulator_resolve_supply(struct regulator_dev
*rdev
)
1362 struct regulator_dev
*r
;
1363 struct device
*dev
= rdev
->dev
.parent
;
1366 /* No supply to resovle? */
1367 if (!rdev
->supply_name
)
1370 /* Supply already resolved? */
1374 r
= regulator_dev_lookup(dev
, rdev
->supply_name
, &ret
);
1375 if (ret
== -ENODEV
) {
1377 * No supply was specified for this regulator and
1378 * there will never be one.
1384 dev_err(dev
, "Failed to resolve %s-supply for %s\n",
1385 rdev
->supply_name
, rdev
->desc
->name
);
1386 return -EPROBE_DEFER
;
1389 /* Recursively resolve the supply of the supply */
1390 ret
= regulator_resolve_supply(r
);
1394 ret
= set_supply(rdev
, r
);
1398 /* Cascade always-on state to supply */
1399 if (_regulator_is_enabled(rdev
)) {
1400 ret
= regulator_enable(rdev
->supply
);
1408 /* Internal regulator request function */
1409 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1410 bool exclusive
, bool allow_dummy
)
1412 struct regulator_dev
*rdev
;
1413 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1414 const char *devname
= NULL
;
1418 pr_err("get() with no identifier\n");
1419 return ERR_PTR(-EINVAL
);
1423 devname
= dev_name(dev
);
1425 if (have_full_constraints())
1428 ret
= -EPROBE_DEFER
;
1430 mutex_lock(®ulator_list_mutex
);
1432 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1436 regulator
= ERR_PTR(ret
);
1439 * If we have return value from dev_lookup fail, we do not expect to
1440 * succeed, so, quit with appropriate error value
1442 if (ret
&& ret
!= -ENODEV
)
1446 devname
= "deviceless";
1449 * Assume that a regulator is physically present and enabled
1450 * even if it isn't hooked up and just provide a dummy.
1452 if (have_full_constraints() && allow_dummy
) {
1453 pr_warn("%s supply %s not found, using dummy regulator\n",
1456 rdev
= dummy_regulator_rdev
;
1458 /* Don't log an error when called from regulator_get_optional() */
1459 } else if (!have_full_constraints() || exclusive
) {
1460 dev_warn(dev
, "dummy supplies not allowed\n");
1463 mutex_unlock(®ulator_list_mutex
);
1467 if (rdev
->exclusive
) {
1468 regulator
= ERR_PTR(-EPERM
);
1472 if (exclusive
&& rdev
->open_count
) {
1473 regulator
= ERR_PTR(-EBUSY
);
1477 ret
= regulator_resolve_supply(rdev
);
1479 regulator
= ERR_PTR(ret
);
1483 if (!try_module_get(rdev
->owner
))
1486 regulator
= create_regulator(rdev
, dev
, id
);
1487 if (regulator
== NULL
) {
1488 regulator
= ERR_PTR(-ENOMEM
);
1489 module_put(rdev
->owner
);
1495 rdev
->exclusive
= 1;
1497 ret
= _regulator_is_enabled(rdev
);
1499 rdev
->use_count
= 1;
1501 rdev
->use_count
= 0;
1505 mutex_unlock(®ulator_list_mutex
);
1511 * regulator_get - lookup and obtain a reference to a regulator.
1512 * @dev: device for regulator "consumer"
1513 * @id: Supply name or regulator ID.
1515 * Returns a struct regulator corresponding to the regulator producer,
1516 * or IS_ERR() condition containing errno.
1518 * Use of supply names configured via regulator_set_device_supply() is
1519 * strongly encouraged. It is recommended that the supply name used
1520 * should match the name used for the supply and/or the relevant
1521 * device pins in the datasheet.
1523 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1525 return _regulator_get(dev
, id
, false, true);
1527 EXPORT_SYMBOL_GPL(regulator_get
);
1530 * regulator_get_exclusive - obtain exclusive access to a regulator.
1531 * @dev: device for regulator "consumer"
1532 * @id: Supply name or regulator ID.
1534 * Returns a struct regulator corresponding to the regulator producer,
1535 * or IS_ERR() condition containing errno. Other consumers will be
1536 * unable to obtain this regulator while this reference is held and the
1537 * use count for the regulator will be initialised to reflect the current
1538 * state of the regulator.
1540 * This is intended for use by consumers which cannot tolerate shared
1541 * use of the regulator such as those which need to force the
1542 * regulator off for correct operation of the hardware they are
1545 * Use of supply names configured via regulator_set_device_supply() is
1546 * strongly encouraged. It is recommended that the supply name used
1547 * should match the name used for the supply and/or the relevant
1548 * device pins in the datasheet.
1550 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1552 return _regulator_get(dev
, id
, true, false);
1554 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1557 * regulator_get_optional - obtain optional access to a regulator.
1558 * @dev: device for regulator "consumer"
1559 * @id: Supply name or regulator ID.
1561 * Returns a struct regulator corresponding to the regulator producer,
1562 * or IS_ERR() condition containing errno.
1564 * This is intended for use by consumers for devices which can have
1565 * some supplies unconnected in normal use, such as some MMC devices.
1566 * It can allow the regulator core to provide stub supplies for other
1567 * supplies requested using normal regulator_get() calls without
1568 * disrupting the operation of drivers that can handle absent
1571 * Use of supply names configured via regulator_set_device_supply() is
1572 * strongly encouraged. It is recommended that the supply name used
1573 * should match the name used for the supply and/or the relevant
1574 * device pins in the datasheet.
1576 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1578 return _regulator_get(dev
, id
, false, false);
1580 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1582 /* regulator_list_mutex lock held by regulator_put() */
1583 static void _regulator_put(struct regulator
*regulator
)
1585 struct regulator_dev
*rdev
;
1587 if (regulator
== NULL
|| IS_ERR(regulator
))
1590 rdev
= regulator
->rdev
;
1592 debugfs_remove_recursive(regulator
->debugfs
);
1594 /* remove any sysfs entries */
1596 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1597 mutex_lock(&rdev
->mutex
);
1598 kfree(regulator
->supply_name
);
1599 list_del(®ulator
->list
);
1603 rdev
->exclusive
= 0;
1604 mutex_unlock(&rdev
->mutex
);
1606 module_put(rdev
->owner
);
1610 * regulator_put - "free" the regulator source
1611 * @regulator: regulator source
1613 * Note: drivers must ensure that all regulator_enable calls made on this
1614 * regulator source are balanced by regulator_disable calls prior to calling
1617 void regulator_put(struct regulator
*regulator
)
1619 mutex_lock(®ulator_list_mutex
);
1620 _regulator_put(regulator
);
1621 mutex_unlock(®ulator_list_mutex
);
1623 EXPORT_SYMBOL_GPL(regulator_put
);
1626 * regulator_register_supply_alias - Provide device alias for supply lookup
1628 * @dev: device that will be given as the regulator "consumer"
1629 * @id: Supply name or regulator ID
1630 * @alias_dev: device that should be used to lookup the supply
1631 * @alias_id: Supply name or regulator ID that should be used to lookup the
1634 * All lookups for id on dev will instead be conducted for alias_id on
1637 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1638 struct device
*alias_dev
,
1639 const char *alias_id
)
1641 struct regulator_supply_alias
*map
;
1643 map
= regulator_find_supply_alias(dev
, id
);
1647 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1652 map
->src_supply
= id
;
1653 map
->alias_dev
= alias_dev
;
1654 map
->alias_supply
= alias_id
;
1656 list_add(&map
->list
, ®ulator_supply_alias_list
);
1658 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1659 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1663 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1666 * regulator_unregister_supply_alias - Remove device alias
1668 * @dev: device that will be given as the regulator "consumer"
1669 * @id: Supply name or regulator ID
1671 * Remove a lookup alias if one exists for id on dev.
1673 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1675 struct regulator_supply_alias
*map
;
1677 map
= regulator_find_supply_alias(dev
, id
);
1679 list_del(&map
->list
);
1683 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1686 * regulator_bulk_register_supply_alias - register multiple aliases
1688 * @dev: device that will be given as the regulator "consumer"
1689 * @id: List of supply names or regulator IDs
1690 * @alias_dev: device that should be used to lookup the supply
1691 * @alias_id: List of supply names or regulator IDs that should be used to
1693 * @num_id: Number of aliases to register
1695 * @return 0 on success, an errno on failure.
1697 * This helper function allows drivers to register several supply
1698 * aliases in one operation. If any of the aliases cannot be
1699 * registered any aliases that were registered will be removed
1700 * before returning to the caller.
1702 int regulator_bulk_register_supply_alias(struct device
*dev
,
1703 const char *const *id
,
1704 struct device
*alias_dev
,
1705 const char *const *alias_id
,
1711 for (i
= 0; i
< num_id
; ++i
) {
1712 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1722 "Failed to create supply alias %s,%s -> %s,%s\n",
1723 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1726 regulator_unregister_supply_alias(dev
, id
[i
]);
1730 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1733 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1735 * @dev: device that will be given as the regulator "consumer"
1736 * @id: List of supply names or regulator IDs
1737 * @num_id: Number of aliases to unregister
1739 * This helper function allows drivers to unregister several supply
1740 * aliases in one operation.
1742 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1743 const char *const *id
,
1748 for (i
= 0; i
< num_id
; ++i
)
1749 regulator_unregister_supply_alias(dev
, id
[i
]);
1751 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1754 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1755 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1756 const struct regulator_config
*config
)
1758 struct regulator_enable_gpio
*pin
;
1759 struct gpio_desc
*gpiod
;
1762 gpiod
= gpio_to_desc(config
->ena_gpio
);
1764 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1765 if (pin
->gpiod
== gpiod
) {
1766 rdev_dbg(rdev
, "GPIO %d is already used\n",
1768 goto update_ena_gpio_to_rdev
;
1772 ret
= gpio_request_one(config
->ena_gpio
,
1773 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1774 rdev_get_name(rdev
));
1778 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1780 gpio_free(config
->ena_gpio
);
1785 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1786 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1788 update_ena_gpio_to_rdev
:
1789 pin
->request_count
++;
1790 rdev
->ena_pin
= pin
;
1794 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1796 struct regulator_enable_gpio
*pin
, *n
;
1801 /* Free the GPIO only in case of no use */
1802 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1803 if (pin
->gpiod
== rdev
->ena_pin
->gpiod
) {
1804 if (pin
->request_count
<= 1) {
1805 pin
->request_count
= 0;
1806 gpiod_put(pin
->gpiod
);
1807 list_del(&pin
->list
);
1809 rdev
->ena_pin
= NULL
;
1812 pin
->request_count
--;
1819 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1820 * @rdev: regulator_dev structure
1821 * @enable: enable GPIO at initial use?
1823 * GPIO is enabled in case of initial use. (enable_count is 0)
1824 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1826 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1828 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1834 /* Enable GPIO at initial use */
1835 if (pin
->enable_count
== 0)
1836 gpiod_set_value_cansleep(pin
->gpiod
,
1837 !pin
->ena_gpio_invert
);
1839 pin
->enable_count
++;
1841 if (pin
->enable_count
> 1) {
1842 pin
->enable_count
--;
1846 /* Disable GPIO if not used */
1847 if (pin
->enable_count
<= 1) {
1848 gpiod_set_value_cansleep(pin
->gpiod
,
1849 pin
->ena_gpio_invert
);
1850 pin
->enable_count
= 0;
1858 * _regulator_enable_delay - a delay helper function
1859 * @delay: time to delay in microseconds
1861 * Delay for the requested amount of time as per the guidelines in:
1863 * Documentation/timers/timers-howto.txt
1865 * The assumption here is that regulators will never be enabled in
1866 * atomic context and therefore sleeping functions can be used.
1868 static void _regulator_enable_delay(unsigned int delay
)
1870 unsigned int ms
= delay
/ 1000;
1871 unsigned int us
= delay
% 1000;
1875 * For small enough values, handle super-millisecond
1876 * delays in the usleep_range() call below.
1885 * Give the scheduler some room to coalesce with any other
1886 * wakeup sources. For delays shorter than 10 us, don't even
1887 * bother setting up high-resolution timers and just busy-
1891 usleep_range(us
, us
+ 100);
1896 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1900 /* Query before enabling in case configuration dependent. */
1901 ret
= _regulator_get_enable_time(rdev
);
1905 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1909 trace_regulator_enable(rdev_get_name(rdev
));
1911 if (rdev
->desc
->off_on_delay
) {
1912 /* if needed, keep a distance of off_on_delay from last time
1913 * this regulator was disabled.
1915 unsigned long start_jiffy
= jiffies
;
1916 unsigned long intended
, max_delay
, remaining
;
1918 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
1919 intended
= rdev
->last_off_jiffy
+ max_delay
;
1921 if (time_before(start_jiffy
, intended
)) {
1922 /* calc remaining jiffies to deal with one-time
1924 * in case of multiple timer wrapping, either it can be
1925 * detected by out-of-range remaining, or it cannot be
1926 * detected and we gets a panelty of
1927 * _regulator_enable_delay().
1929 remaining
= intended
- start_jiffy
;
1930 if (remaining
<= max_delay
)
1931 _regulator_enable_delay(
1932 jiffies_to_usecs(remaining
));
1936 if (rdev
->ena_pin
) {
1937 if (!rdev
->ena_gpio_state
) {
1938 ret
= regulator_ena_gpio_ctrl(rdev
, true);
1941 rdev
->ena_gpio_state
= 1;
1943 } else if (rdev
->desc
->ops
->enable
) {
1944 ret
= rdev
->desc
->ops
->enable(rdev
);
1951 /* Allow the regulator to ramp; it would be useful to extend
1952 * this for bulk operations so that the regulators can ramp
1954 trace_regulator_enable_delay(rdev_get_name(rdev
));
1956 _regulator_enable_delay(delay
);
1958 trace_regulator_enable_complete(rdev_get_name(rdev
));
1963 /* locks held by regulator_enable() */
1964 static int _regulator_enable(struct regulator_dev
*rdev
)
1968 /* check voltage and requested load before enabling */
1969 if (rdev
->constraints
&&
1970 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1971 drms_uA_update(rdev
);
1973 if (rdev
->use_count
== 0) {
1974 /* The regulator may on if it's not switchable or left on */
1975 ret
= _regulator_is_enabled(rdev
);
1976 if (ret
== -EINVAL
|| ret
== 0) {
1977 if (!_regulator_can_change_status(rdev
))
1980 ret
= _regulator_do_enable(rdev
);
1984 } else if (ret
< 0) {
1985 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1988 /* Fallthrough on positive return values - already enabled */
1997 * regulator_enable - enable regulator output
1998 * @regulator: regulator source
2000 * Request that the regulator be enabled with the regulator output at
2001 * the predefined voltage or current value. Calls to regulator_enable()
2002 * must be balanced with calls to regulator_disable().
2004 * NOTE: the output value can be set by other drivers, boot loader or may be
2005 * hardwired in the regulator.
2007 int regulator_enable(struct regulator
*regulator
)
2009 struct regulator_dev
*rdev
= regulator
->rdev
;
2012 if (regulator
->always_on
)
2016 ret
= regulator_enable(rdev
->supply
);
2021 mutex_lock(&rdev
->mutex
);
2022 ret
= _regulator_enable(rdev
);
2023 mutex_unlock(&rdev
->mutex
);
2025 if (ret
!= 0 && rdev
->supply
)
2026 regulator_disable(rdev
->supply
);
2030 EXPORT_SYMBOL_GPL(regulator_enable
);
2032 static int _regulator_do_disable(struct regulator_dev
*rdev
)
2036 trace_regulator_disable(rdev_get_name(rdev
));
2038 if (rdev
->ena_pin
) {
2039 if (rdev
->ena_gpio_state
) {
2040 ret
= regulator_ena_gpio_ctrl(rdev
, false);
2043 rdev
->ena_gpio_state
= 0;
2046 } else if (rdev
->desc
->ops
->disable
) {
2047 ret
= rdev
->desc
->ops
->disable(rdev
);
2052 /* cares about last_off_jiffy only if off_on_delay is required by
2055 if (rdev
->desc
->off_on_delay
)
2056 rdev
->last_off_jiffy
= jiffies
;
2058 trace_regulator_disable_complete(rdev_get_name(rdev
));
2063 /* locks held by regulator_disable() */
2064 static int _regulator_disable(struct regulator_dev
*rdev
)
2068 if (WARN(rdev
->use_count
<= 0,
2069 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
2072 /* are we the last user and permitted to disable ? */
2073 if (rdev
->use_count
== 1 &&
2074 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
2076 /* we are last user */
2077 if (_regulator_can_change_status(rdev
)) {
2078 ret
= _notifier_call_chain(rdev
,
2079 REGULATOR_EVENT_PRE_DISABLE
,
2081 if (ret
& NOTIFY_STOP_MASK
)
2084 ret
= _regulator_do_disable(rdev
);
2086 rdev_err(rdev
, "failed to disable\n");
2087 _notifier_call_chain(rdev
,
2088 REGULATOR_EVENT_ABORT_DISABLE
,
2092 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
2096 rdev
->use_count
= 0;
2097 } else if (rdev
->use_count
> 1) {
2099 if (rdev
->constraints
&&
2100 (rdev
->constraints
->valid_ops_mask
&
2101 REGULATOR_CHANGE_DRMS
))
2102 drms_uA_update(rdev
);
2111 * regulator_disable - disable regulator output
2112 * @regulator: regulator source
2114 * Disable the regulator output voltage or current. Calls to
2115 * regulator_enable() must be balanced with calls to
2116 * regulator_disable().
2118 * NOTE: this will only disable the regulator output if no other consumer
2119 * devices have it enabled, the regulator device supports disabling and
2120 * machine constraints permit this operation.
2122 int regulator_disable(struct regulator
*regulator
)
2124 struct regulator_dev
*rdev
= regulator
->rdev
;
2127 if (regulator
->always_on
)
2130 mutex_lock(&rdev
->mutex
);
2131 ret
= _regulator_disable(rdev
);
2132 mutex_unlock(&rdev
->mutex
);
2134 if (ret
== 0 && rdev
->supply
)
2135 regulator_disable(rdev
->supply
);
2139 EXPORT_SYMBOL_GPL(regulator_disable
);
2141 /* locks held by regulator_force_disable() */
2142 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2146 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2147 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2148 if (ret
& NOTIFY_STOP_MASK
)
2151 ret
= _regulator_do_disable(rdev
);
2153 rdev_err(rdev
, "failed to force disable\n");
2154 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2155 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2159 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2160 REGULATOR_EVENT_DISABLE
, NULL
);
2166 * regulator_force_disable - force disable regulator output
2167 * @regulator: regulator source
2169 * Forcibly disable the regulator output voltage or current.
2170 * NOTE: this *will* disable the regulator output even if other consumer
2171 * devices have it enabled. This should be used for situations when device
2172 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2174 int regulator_force_disable(struct regulator
*regulator
)
2176 struct regulator_dev
*rdev
= regulator
->rdev
;
2179 mutex_lock(&rdev
->mutex
);
2180 regulator
->uA_load
= 0;
2181 ret
= _regulator_force_disable(regulator
->rdev
);
2182 mutex_unlock(&rdev
->mutex
);
2185 while (rdev
->open_count
--)
2186 regulator_disable(rdev
->supply
);
2190 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2192 static void regulator_disable_work(struct work_struct
*work
)
2194 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2198 mutex_lock(&rdev
->mutex
);
2200 BUG_ON(!rdev
->deferred_disables
);
2202 count
= rdev
->deferred_disables
;
2203 rdev
->deferred_disables
= 0;
2205 for (i
= 0; i
< count
; i
++) {
2206 ret
= _regulator_disable(rdev
);
2208 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2211 mutex_unlock(&rdev
->mutex
);
2214 for (i
= 0; i
< count
; i
++) {
2215 ret
= regulator_disable(rdev
->supply
);
2218 "Supply disable failed: %d\n", ret
);
2225 * regulator_disable_deferred - disable regulator output with delay
2226 * @regulator: regulator source
2227 * @ms: miliseconds until the regulator is disabled
2229 * Execute regulator_disable() on the regulator after a delay. This
2230 * is intended for use with devices that require some time to quiesce.
2232 * NOTE: this will only disable the regulator output if no other consumer
2233 * devices have it enabled, the regulator device supports disabling and
2234 * machine constraints permit this operation.
2236 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2238 struct regulator_dev
*rdev
= regulator
->rdev
;
2241 if (regulator
->always_on
)
2245 return regulator_disable(regulator
);
2247 mutex_lock(&rdev
->mutex
);
2248 rdev
->deferred_disables
++;
2249 mutex_unlock(&rdev
->mutex
);
2251 ret
= queue_delayed_work(system_power_efficient_wq
,
2252 &rdev
->disable_work
,
2253 msecs_to_jiffies(ms
));
2259 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2261 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2263 /* A GPIO control always takes precedence */
2265 return rdev
->ena_gpio_state
;
2267 /* If we don't know then assume that the regulator is always on */
2268 if (!rdev
->desc
->ops
->is_enabled
)
2271 return rdev
->desc
->ops
->is_enabled(rdev
);
2275 * regulator_is_enabled - is the regulator output enabled
2276 * @regulator: regulator source
2278 * Returns positive if the regulator driver backing the source/client
2279 * has requested that the device be enabled, zero if it hasn't, else a
2280 * negative errno code.
2282 * Note that the device backing this regulator handle can have multiple
2283 * users, so it might be enabled even if regulator_enable() was never
2284 * called for this particular source.
2286 int regulator_is_enabled(struct regulator
*regulator
)
2290 if (regulator
->always_on
)
2293 mutex_lock(®ulator
->rdev
->mutex
);
2294 ret
= _regulator_is_enabled(regulator
->rdev
);
2295 mutex_unlock(®ulator
->rdev
->mutex
);
2299 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2302 * regulator_can_change_voltage - check if regulator can change voltage
2303 * @regulator: regulator source
2305 * Returns positive if the regulator driver backing the source/client
2306 * can change its voltage, false otherwise. Useful for detecting fixed
2307 * or dummy regulators and disabling voltage change logic in the client
2310 int regulator_can_change_voltage(struct regulator
*regulator
)
2312 struct regulator_dev
*rdev
= regulator
->rdev
;
2314 if (rdev
->constraints
&&
2315 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2316 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2319 if (rdev
->desc
->continuous_voltage_range
&&
2320 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2321 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2327 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2330 * regulator_count_voltages - count regulator_list_voltage() selectors
2331 * @regulator: regulator source
2333 * Returns number of selectors, or negative errno. Selectors are
2334 * numbered starting at zero, and typically correspond to bitfields
2335 * in hardware registers.
2337 int regulator_count_voltages(struct regulator
*regulator
)
2339 struct regulator_dev
*rdev
= regulator
->rdev
;
2341 if (rdev
->desc
->n_voltages
)
2342 return rdev
->desc
->n_voltages
;
2347 return regulator_count_voltages(rdev
->supply
);
2349 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2352 * regulator_list_voltage - enumerate supported voltages
2353 * @regulator: regulator source
2354 * @selector: identify voltage to list
2355 * Context: can sleep
2357 * Returns a voltage that can be passed to @regulator_set_voltage(),
2358 * zero if this selector code can't be used on this system, or a
2361 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2363 struct regulator_dev
*rdev
= regulator
->rdev
;
2364 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2367 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2368 return rdev
->desc
->fixed_uV
;
2370 if (ops
->list_voltage
) {
2371 if (selector
>= rdev
->desc
->n_voltages
)
2373 mutex_lock(&rdev
->mutex
);
2374 ret
= ops
->list_voltage(rdev
, selector
);
2375 mutex_unlock(&rdev
->mutex
);
2376 } else if (rdev
->supply
) {
2377 ret
= regulator_list_voltage(rdev
->supply
, selector
);
2383 if (ret
< rdev
->constraints
->min_uV
)
2385 else if (ret
> rdev
->constraints
->max_uV
)
2391 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2394 * regulator_get_regmap - get the regulator's register map
2395 * @regulator: regulator source
2397 * Returns the register map for the given regulator, or an ERR_PTR value
2398 * if the regulator doesn't use regmap.
2400 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
2402 struct regmap
*map
= regulator
->rdev
->regmap
;
2404 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
2408 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2409 * @regulator: regulator source
2410 * @vsel_reg: voltage selector register, output parameter
2411 * @vsel_mask: mask for voltage selector bitfield, output parameter
2413 * Returns the hardware register offset and bitmask used for setting the
2414 * regulator voltage. This might be useful when configuring voltage-scaling
2415 * hardware or firmware that can make I2C requests behind the kernel's back,
2418 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2419 * and 0 is returned, otherwise a negative errno is returned.
2421 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
2423 unsigned *vsel_mask
)
2425 struct regulator_dev
*rdev
= regulator
->rdev
;
2426 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2428 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2431 *vsel_reg
= rdev
->desc
->vsel_reg
;
2432 *vsel_mask
= rdev
->desc
->vsel_mask
;
2436 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
2439 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2440 * @regulator: regulator source
2441 * @selector: identify voltage to list
2443 * Converts the selector to a hardware-specific voltage selector that can be
2444 * directly written to the regulator registers. The address of the voltage
2445 * register can be determined by calling @regulator_get_hardware_vsel_register.
2447 * On error a negative errno is returned.
2449 int regulator_list_hardware_vsel(struct regulator
*regulator
,
2452 struct regulator_dev
*rdev
= regulator
->rdev
;
2453 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2455 if (selector
>= rdev
->desc
->n_voltages
)
2457 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2462 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
2465 * regulator_get_linear_step - return the voltage step size between VSEL values
2466 * @regulator: regulator source
2468 * Returns the voltage step size between VSEL values for linear
2469 * regulators, or return 0 if the regulator isn't a linear regulator.
2471 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2473 struct regulator_dev
*rdev
= regulator
->rdev
;
2475 return rdev
->desc
->uV_step
;
2477 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2480 * regulator_is_supported_voltage - check if a voltage range can be supported
2482 * @regulator: Regulator to check.
2483 * @min_uV: Minimum required voltage in uV.
2484 * @max_uV: Maximum required voltage in uV.
2486 * Returns a boolean or a negative error code.
2488 int regulator_is_supported_voltage(struct regulator
*regulator
,
2489 int min_uV
, int max_uV
)
2491 struct regulator_dev
*rdev
= regulator
->rdev
;
2492 int i
, voltages
, ret
;
2494 /* If we can't change voltage check the current voltage */
2495 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2496 ret
= regulator_get_voltage(regulator
);
2498 return min_uV
<= ret
&& ret
<= max_uV
;
2503 /* Any voltage within constrains range is fine? */
2504 if (rdev
->desc
->continuous_voltage_range
)
2505 return min_uV
>= rdev
->constraints
->min_uV
&&
2506 max_uV
<= rdev
->constraints
->max_uV
;
2508 ret
= regulator_count_voltages(regulator
);
2513 for (i
= 0; i
< voltages
; i
++) {
2514 ret
= regulator_list_voltage(regulator
, i
);
2516 if (ret
>= min_uV
&& ret
<= max_uV
)
2522 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2524 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
2525 int min_uV
, int max_uV
,
2528 struct pre_voltage_change_data data
;
2531 data
.old_uV
= _regulator_get_voltage(rdev
);
2532 data
.min_uV
= min_uV
;
2533 data
.max_uV
= max_uV
;
2534 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2536 if (ret
& NOTIFY_STOP_MASK
)
2539 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
2543 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2544 (void *)data
.old_uV
);
2549 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
2550 int uV
, unsigned selector
)
2552 struct pre_voltage_change_data data
;
2555 data
.old_uV
= _regulator_get_voltage(rdev
);
2558 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2560 if (ret
& NOTIFY_STOP_MASK
)
2563 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
2567 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2568 (void *)data
.old_uV
);
2573 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2574 int min_uV
, int max_uV
)
2579 unsigned int selector
;
2580 int old_selector
= -1;
2582 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2584 min_uV
+= rdev
->constraints
->uV_offset
;
2585 max_uV
+= rdev
->constraints
->uV_offset
;
2588 * If we can't obtain the old selector there is not enough
2589 * info to call set_voltage_time_sel().
2591 if (_regulator_is_enabled(rdev
) &&
2592 rdev
->desc
->ops
->set_voltage_time_sel
&&
2593 rdev
->desc
->ops
->get_voltage_sel
) {
2594 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2595 if (old_selector
< 0)
2596 return old_selector
;
2599 if (rdev
->desc
->ops
->set_voltage
) {
2600 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
2604 if (rdev
->desc
->ops
->list_voltage
)
2605 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2608 best_val
= _regulator_get_voltage(rdev
);
2611 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2612 if (rdev
->desc
->ops
->map_voltage
) {
2613 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2616 if (rdev
->desc
->ops
->list_voltage
==
2617 regulator_list_voltage_linear
)
2618 ret
= regulator_map_voltage_linear(rdev
,
2620 else if (rdev
->desc
->ops
->list_voltage
==
2621 regulator_list_voltage_linear_range
)
2622 ret
= regulator_map_voltage_linear_range(rdev
,
2625 ret
= regulator_map_voltage_iterate(rdev
,
2630 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2631 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2633 if (old_selector
== selector
)
2636 ret
= _regulator_call_set_voltage_sel(
2637 rdev
, best_val
, selector
);
2646 /* Call set_voltage_time_sel if successfully obtained old_selector */
2647 if (ret
== 0 && !rdev
->constraints
->ramp_disable
&& old_selector
>= 0
2648 && old_selector
!= selector
) {
2650 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2651 old_selector
, selector
);
2653 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2658 /* Insert any necessary delays */
2659 if (delay
>= 1000) {
2660 mdelay(delay
/ 1000);
2661 udelay(delay
% 1000);
2667 if (ret
== 0 && best_val
>= 0) {
2668 unsigned long data
= best_val
;
2670 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2674 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2680 * regulator_set_voltage - set regulator output voltage
2681 * @regulator: regulator source
2682 * @min_uV: Minimum required voltage in uV
2683 * @max_uV: Maximum acceptable voltage in uV
2685 * Sets a voltage regulator to the desired output voltage. This can be set
2686 * during any regulator state. IOW, regulator can be disabled or enabled.
2688 * If the regulator is enabled then the voltage will change to the new value
2689 * immediately otherwise if the regulator is disabled the regulator will
2690 * output at the new voltage when enabled.
2692 * NOTE: If the regulator is shared between several devices then the lowest
2693 * request voltage that meets the system constraints will be used.
2694 * Regulator system constraints must be set for this regulator before
2695 * calling this function otherwise this call will fail.
2697 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2699 struct regulator_dev
*rdev
= regulator
->rdev
;
2701 int old_min_uV
, old_max_uV
;
2704 mutex_lock(&rdev
->mutex
);
2706 /* If we're setting the same range as last time the change
2707 * should be a noop (some cpufreq implementations use the same
2708 * voltage for multiple frequencies, for example).
2710 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2713 /* If we're trying to set a range that overlaps the current voltage,
2714 * return succesfully even though the regulator does not support
2715 * changing the voltage.
2717 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2718 current_uV
= _regulator_get_voltage(rdev
);
2719 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
2720 regulator
->min_uV
= min_uV
;
2721 regulator
->max_uV
= max_uV
;
2727 if (!rdev
->desc
->ops
->set_voltage
&&
2728 !rdev
->desc
->ops
->set_voltage_sel
) {
2733 /* constraints check */
2734 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2738 /* restore original values in case of error */
2739 old_min_uV
= regulator
->min_uV
;
2740 old_max_uV
= regulator
->max_uV
;
2741 regulator
->min_uV
= min_uV
;
2742 regulator
->max_uV
= max_uV
;
2744 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2748 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2753 mutex_unlock(&rdev
->mutex
);
2756 regulator
->min_uV
= old_min_uV
;
2757 regulator
->max_uV
= old_max_uV
;
2758 mutex_unlock(&rdev
->mutex
);
2761 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2764 * regulator_set_voltage_time - get raise/fall time
2765 * @regulator: regulator source
2766 * @old_uV: starting voltage in microvolts
2767 * @new_uV: target voltage in microvolts
2769 * Provided with the starting and ending voltage, this function attempts to
2770 * calculate the time in microseconds required to rise or fall to this new
2773 int regulator_set_voltage_time(struct regulator
*regulator
,
2774 int old_uV
, int new_uV
)
2776 struct regulator_dev
*rdev
= regulator
->rdev
;
2777 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2783 /* Currently requires operations to do this */
2784 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2785 || !rdev
->desc
->n_voltages
)
2788 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2789 /* We only look for exact voltage matches here */
2790 voltage
= regulator_list_voltage(regulator
, i
);
2795 if (voltage
== old_uV
)
2797 if (voltage
== new_uV
)
2801 if (old_sel
< 0 || new_sel
< 0)
2804 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2806 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2809 * regulator_set_voltage_time_sel - get raise/fall time
2810 * @rdev: regulator source device
2811 * @old_selector: selector for starting voltage
2812 * @new_selector: selector for target voltage
2814 * Provided with the starting and target voltage selectors, this function
2815 * returns time in microseconds required to rise or fall to this new voltage
2817 * Drivers providing ramp_delay in regulation_constraints can use this as their
2818 * set_voltage_time_sel() operation.
2820 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2821 unsigned int old_selector
,
2822 unsigned int new_selector
)
2824 unsigned int ramp_delay
= 0;
2825 int old_volt
, new_volt
;
2827 if (rdev
->constraints
->ramp_delay
)
2828 ramp_delay
= rdev
->constraints
->ramp_delay
;
2829 else if (rdev
->desc
->ramp_delay
)
2830 ramp_delay
= rdev
->desc
->ramp_delay
;
2832 if (ramp_delay
== 0) {
2833 rdev_warn(rdev
, "ramp_delay not set\n");
2838 if (!rdev
->desc
->ops
->list_voltage
)
2841 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2842 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2844 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2846 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2849 * regulator_sync_voltage - re-apply last regulator output voltage
2850 * @regulator: regulator source
2852 * Re-apply the last configured voltage. This is intended to be used
2853 * where some external control source the consumer is cooperating with
2854 * has caused the configured voltage to change.
2856 int regulator_sync_voltage(struct regulator
*regulator
)
2858 struct regulator_dev
*rdev
= regulator
->rdev
;
2859 int ret
, min_uV
, max_uV
;
2861 mutex_lock(&rdev
->mutex
);
2863 if (!rdev
->desc
->ops
->set_voltage
&&
2864 !rdev
->desc
->ops
->set_voltage_sel
) {
2869 /* This is only going to work if we've had a voltage configured. */
2870 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2875 min_uV
= regulator
->min_uV
;
2876 max_uV
= regulator
->max_uV
;
2878 /* This should be a paranoia check... */
2879 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2883 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2887 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2890 mutex_unlock(&rdev
->mutex
);
2893 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2895 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2899 if (rdev
->desc
->ops
->get_voltage_sel
) {
2900 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2903 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2904 } else if (rdev
->desc
->ops
->get_voltage
) {
2905 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2906 } else if (rdev
->desc
->ops
->list_voltage
) {
2907 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2908 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
2909 ret
= rdev
->desc
->fixed_uV
;
2910 } else if (rdev
->supply
) {
2911 ret
= regulator_get_voltage(rdev
->supply
);
2918 return ret
- rdev
->constraints
->uV_offset
;
2922 * regulator_get_voltage - get regulator output voltage
2923 * @regulator: regulator source
2925 * This returns the current regulator voltage in uV.
2927 * NOTE: If the regulator is disabled it will return the voltage value. This
2928 * function should not be used to determine regulator state.
2930 int regulator_get_voltage(struct regulator
*regulator
)
2934 mutex_lock(®ulator
->rdev
->mutex
);
2936 ret
= _regulator_get_voltage(regulator
->rdev
);
2938 mutex_unlock(®ulator
->rdev
->mutex
);
2942 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2945 * regulator_set_current_limit - set regulator output current limit
2946 * @regulator: regulator source
2947 * @min_uA: Minimum supported current in uA
2948 * @max_uA: Maximum supported current in uA
2950 * Sets current sink to the desired output current. This can be set during
2951 * any regulator state. IOW, regulator can be disabled or enabled.
2953 * If the regulator is enabled then the current will change to the new value
2954 * immediately otherwise if the regulator is disabled the regulator will
2955 * output at the new current when enabled.
2957 * NOTE: Regulator system constraints must be set for this regulator before
2958 * calling this function otherwise this call will fail.
2960 int regulator_set_current_limit(struct regulator
*regulator
,
2961 int min_uA
, int max_uA
)
2963 struct regulator_dev
*rdev
= regulator
->rdev
;
2966 mutex_lock(&rdev
->mutex
);
2969 if (!rdev
->desc
->ops
->set_current_limit
) {
2974 /* constraints check */
2975 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2979 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2981 mutex_unlock(&rdev
->mutex
);
2984 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2986 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2990 mutex_lock(&rdev
->mutex
);
2993 if (!rdev
->desc
->ops
->get_current_limit
) {
2998 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
3000 mutex_unlock(&rdev
->mutex
);
3005 * regulator_get_current_limit - get regulator output current
3006 * @regulator: regulator source
3008 * This returns the current supplied by the specified current sink in uA.
3010 * NOTE: If the regulator is disabled it will return the current value. This
3011 * function should not be used to determine regulator state.
3013 int regulator_get_current_limit(struct regulator
*regulator
)
3015 return _regulator_get_current_limit(regulator
->rdev
);
3017 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
3020 * regulator_set_mode - set regulator operating mode
3021 * @regulator: regulator source
3022 * @mode: operating mode - one of the REGULATOR_MODE constants
3024 * Set regulator operating mode to increase regulator efficiency or improve
3025 * regulation performance.
3027 * NOTE: Regulator system constraints must be set for this regulator before
3028 * calling this function otherwise this call will fail.
3030 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
3032 struct regulator_dev
*rdev
= regulator
->rdev
;
3034 int regulator_curr_mode
;
3036 mutex_lock(&rdev
->mutex
);
3039 if (!rdev
->desc
->ops
->set_mode
) {
3044 /* return if the same mode is requested */
3045 if (rdev
->desc
->ops
->get_mode
) {
3046 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
3047 if (regulator_curr_mode
== mode
) {
3053 /* constraints check */
3054 ret
= regulator_mode_constrain(rdev
, &mode
);
3058 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
3060 mutex_unlock(&rdev
->mutex
);
3063 EXPORT_SYMBOL_GPL(regulator_set_mode
);
3065 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
3069 mutex_lock(&rdev
->mutex
);
3072 if (!rdev
->desc
->ops
->get_mode
) {
3077 ret
= rdev
->desc
->ops
->get_mode(rdev
);
3079 mutex_unlock(&rdev
->mutex
);
3084 * regulator_get_mode - get regulator operating mode
3085 * @regulator: regulator source
3087 * Get the current regulator operating mode.
3089 unsigned int regulator_get_mode(struct regulator
*regulator
)
3091 return _regulator_get_mode(regulator
->rdev
);
3093 EXPORT_SYMBOL_GPL(regulator_get_mode
);
3096 * regulator_set_load - set regulator load
3097 * @regulator: regulator source
3098 * @uA_load: load current
3100 * Notifies the regulator core of a new device load. This is then used by
3101 * DRMS (if enabled by constraints) to set the most efficient regulator
3102 * operating mode for the new regulator loading.
3104 * Consumer devices notify their supply regulator of the maximum power
3105 * they will require (can be taken from device datasheet in the power
3106 * consumption tables) when they change operational status and hence power
3107 * state. Examples of operational state changes that can affect power
3108 * consumption are :-
3110 * o Device is opened / closed.
3111 * o Device I/O is about to begin or has just finished.
3112 * o Device is idling in between work.
3114 * This information is also exported via sysfs to userspace.
3116 * DRMS will sum the total requested load on the regulator and change
3117 * to the most efficient operating mode if platform constraints allow.
3119 * On error a negative errno is returned.
3121 int regulator_set_load(struct regulator
*regulator
, int uA_load
)
3123 struct regulator_dev
*rdev
= regulator
->rdev
;
3126 mutex_lock(&rdev
->mutex
);
3127 regulator
->uA_load
= uA_load
;
3128 ret
= drms_uA_update(rdev
);
3129 mutex_unlock(&rdev
->mutex
);
3133 EXPORT_SYMBOL_GPL(regulator_set_load
);
3136 * regulator_allow_bypass - allow the regulator to go into bypass mode
3138 * @regulator: Regulator to configure
3139 * @enable: enable or disable bypass mode
3141 * Allow the regulator to go into bypass mode if all other consumers
3142 * for the regulator also enable bypass mode and the machine
3143 * constraints allow this. Bypass mode means that the regulator is
3144 * simply passing the input directly to the output with no regulation.
3146 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3148 struct regulator_dev
*rdev
= regulator
->rdev
;
3151 if (!rdev
->desc
->ops
->set_bypass
)
3154 if (rdev
->constraints
&&
3155 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
3158 mutex_lock(&rdev
->mutex
);
3160 if (enable
&& !regulator
->bypass
) {
3161 rdev
->bypass_count
++;
3163 if (rdev
->bypass_count
== rdev
->open_count
) {
3164 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3166 rdev
->bypass_count
--;
3169 } else if (!enable
&& regulator
->bypass
) {
3170 rdev
->bypass_count
--;
3172 if (rdev
->bypass_count
!= rdev
->open_count
) {
3173 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3175 rdev
->bypass_count
++;
3180 regulator
->bypass
= enable
;
3182 mutex_unlock(&rdev
->mutex
);
3186 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3189 * regulator_register_notifier - register regulator event notifier
3190 * @regulator: regulator source
3191 * @nb: notifier block
3193 * Register notifier block to receive regulator events.
3195 int regulator_register_notifier(struct regulator
*regulator
,
3196 struct notifier_block
*nb
)
3198 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3201 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3204 * regulator_unregister_notifier - unregister regulator event notifier
3205 * @regulator: regulator source
3206 * @nb: notifier block
3208 * Unregister regulator event notifier block.
3210 int regulator_unregister_notifier(struct regulator
*regulator
,
3211 struct notifier_block
*nb
)
3213 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3216 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3218 /* notify regulator consumers and downstream regulator consumers.
3219 * Note mutex must be held by caller.
3221 static int _notifier_call_chain(struct regulator_dev
*rdev
,
3222 unsigned long event
, void *data
)
3224 /* call rdev chain first */
3225 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3229 * regulator_bulk_get - get multiple regulator consumers
3231 * @dev: Device to supply
3232 * @num_consumers: Number of consumers to register
3233 * @consumers: Configuration of consumers; clients are stored here.
3235 * @return 0 on success, an errno on failure.
3237 * This helper function allows drivers to get several regulator
3238 * consumers in one operation. If any of the regulators cannot be
3239 * acquired then any regulators that were allocated will be freed
3240 * before returning to the caller.
3242 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3243 struct regulator_bulk_data
*consumers
)
3248 for (i
= 0; i
< num_consumers
; i
++)
3249 consumers
[i
].consumer
= NULL
;
3251 for (i
= 0; i
< num_consumers
; i
++) {
3252 consumers
[i
].consumer
= regulator_get(dev
,
3253 consumers
[i
].supply
);
3254 if (IS_ERR(consumers
[i
].consumer
)) {
3255 ret
= PTR_ERR(consumers
[i
].consumer
);
3256 dev_err(dev
, "Failed to get supply '%s': %d\n",
3257 consumers
[i
].supply
, ret
);
3258 consumers
[i
].consumer
= NULL
;
3267 regulator_put(consumers
[i
].consumer
);
3271 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3273 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3275 struct regulator_bulk_data
*bulk
= data
;
3277 bulk
->ret
= regulator_enable(bulk
->consumer
);
3281 * regulator_bulk_enable - enable multiple regulator consumers
3283 * @num_consumers: Number of consumers
3284 * @consumers: Consumer data; clients are stored here.
3285 * @return 0 on success, an errno on failure
3287 * This convenience API allows consumers to enable multiple regulator
3288 * clients in a single API call. If any consumers cannot be enabled
3289 * then any others that were enabled will be disabled again prior to
3292 int regulator_bulk_enable(int num_consumers
,
3293 struct regulator_bulk_data
*consumers
)
3295 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3299 for (i
= 0; i
< num_consumers
; i
++) {
3300 if (consumers
[i
].consumer
->always_on
)
3301 consumers
[i
].ret
= 0;
3303 async_schedule_domain(regulator_bulk_enable_async
,
3304 &consumers
[i
], &async_domain
);
3307 async_synchronize_full_domain(&async_domain
);
3309 /* If any consumer failed we need to unwind any that succeeded */
3310 for (i
= 0; i
< num_consumers
; i
++) {
3311 if (consumers
[i
].ret
!= 0) {
3312 ret
= consumers
[i
].ret
;
3320 for (i
= 0; i
< num_consumers
; i
++) {
3321 if (consumers
[i
].ret
< 0)
3322 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3325 regulator_disable(consumers
[i
].consumer
);
3330 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3333 * regulator_bulk_disable - disable multiple regulator consumers
3335 * @num_consumers: Number of consumers
3336 * @consumers: Consumer data; clients are stored here.
3337 * @return 0 on success, an errno on failure
3339 * This convenience API allows consumers to disable multiple regulator
3340 * clients in a single API call. If any consumers cannot be disabled
3341 * then any others that were disabled will be enabled again prior to
3344 int regulator_bulk_disable(int num_consumers
,
3345 struct regulator_bulk_data
*consumers
)
3350 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3351 ret
= regulator_disable(consumers
[i
].consumer
);
3359 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3360 for (++i
; i
< num_consumers
; ++i
) {
3361 r
= regulator_enable(consumers
[i
].consumer
);
3363 pr_err("Failed to reename %s: %d\n",
3364 consumers
[i
].supply
, r
);
3369 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3372 * regulator_bulk_force_disable - force disable multiple regulator consumers
3374 * @num_consumers: Number of consumers
3375 * @consumers: Consumer data; clients are stored here.
3376 * @return 0 on success, an errno on failure
3378 * This convenience API allows consumers to forcibly disable multiple regulator
3379 * clients in a single API call.
3380 * NOTE: This should be used for situations when device damage will
3381 * likely occur if the regulators are not disabled (e.g. over temp).
3382 * Although regulator_force_disable function call for some consumers can
3383 * return error numbers, the function is called for all consumers.
3385 int regulator_bulk_force_disable(int num_consumers
,
3386 struct regulator_bulk_data
*consumers
)
3391 for (i
= 0; i
< num_consumers
; i
++)
3393 regulator_force_disable(consumers
[i
].consumer
);
3395 for (i
= 0; i
< num_consumers
; i
++) {
3396 if (consumers
[i
].ret
!= 0) {
3397 ret
= consumers
[i
].ret
;
3406 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3409 * regulator_bulk_free - free multiple regulator consumers
3411 * @num_consumers: Number of consumers
3412 * @consumers: Consumer data; clients are stored here.
3414 * This convenience API allows consumers to free multiple regulator
3415 * clients in a single API call.
3417 void regulator_bulk_free(int num_consumers
,
3418 struct regulator_bulk_data
*consumers
)
3422 for (i
= 0; i
< num_consumers
; i
++) {
3423 regulator_put(consumers
[i
].consumer
);
3424 consumers
[i
].consumer
= NULL
;
3427 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3430 * regulator_notifier_call_chain - call regulator event notifier
3431 * @rdev: regulator source
3432 * @event: notifier block
3433 * @data: callback-specific data.
3435 * Called by regulator drivers to notify clients a regulator event has
3436 * occurred. We also notify regulator clients downstream.
3437 * Note lock must be held by caller.
3439 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3440 unsigned long event
, void *data
)
3442 _notifier_call_chain(rdev
, event
, data
);
3446 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3449 * regulator_mode_to_status - convert a regulator mode into a status
3451 * @mode: Mode to convert
3453 * Convert a regulator mode into a status.
3455 int regulator_mode_to_status(unsigned int mode
)
3458 case REGULATOR_MODE_FAST
:
3459 return REGULATOR_STATUS_FAST
;
3460 case REGULATOR_MODE_NORMAL
:
3461 return REGULATOR_STATUS_NORMAL
;
3462 case REGULATOR_MODE_IDLE
:
3463 return REGULATOR_STATUS_IDLE
;
3464 case REGULATOR_MODE_STANDBY
:
3465 return REGULATOR_STATUS_STANDBY
;
3467 return REGULATOR_STATUS_UNDEFINED
;
3470 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3472 static struct attribute
*regulator_dev_attrs
[] = {
3473 &dev_attr_name
.attr
,
3474 &dev_attr_num_users
.attr
,
3475 &dev_attr_type
.attr
,
3476 &dev_attr_microvolts
.attr
,
3477 &dev_attr_microamps
.attr
,
3478 &dev_attr_opmode
.attr
,
3479 &dev_attr_state
.attr
,
3480 &dev_attr_status
.attr
,
3481 &dev_attr_bypass
.attr
,
3482 &dev_attr_requested_microamps
.attr
,
3483 &dev_attr_min_microvolts
.attr
,
3484 &dev_attr_max_microvolts
.attr
,
3485 &dev_attr_min_microamps
.attr
,
3486 &dev_attr_max_microamps
.attr
,
3487 &dev_attr_suspend_standby_state
.attr
,
3488 &dev_attr_suspend_mem_state
.attr
,
3489 &dev_attr_suspend_disk_state
.attr
,
3490 &dev_attr_suspend_standby_microvolts
.attr
,
3491 &dev_attr_suspend_mem_microvolts
.attr
,
3492 &dev_attr_suspend_disk_microvolts
.attr
,
3493 &dev_attr_suspend_standby_mode
.attr
,
3494 &dev_attr_suspend_mem_mode
.attr
,
3495 &dev_attr_suspend_disk_mode
.attr
,
3500 * To avoid cluttering sysfs (and memory) with useless state, only
3501 * create attributes that can be meaningfully displayed.
3503 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
3504 struct attribute
*attr
, int idx
)
3506 struct device
*dev
= kobj_to_dev(kobj
);
3507 struct regulator_dev
*rdev
= container_of(dev
, struct regulator_dev
, dev
);
3508 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3509 umode_t mode
= attr
->mode
;
3511 /* these three are always present */
3512 if (attr
== &dev_attr_name
.attr
||
3513 attr
== &dev_attr_num_users
.attr
||
3514 attr
== &dev_attr_type
.attr
)
3517 /* some attributes need specific methods to be displayed */
3518 if (attr
== &dev_attr_microvolts
.attr
) {
3519 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3520 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3521 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3522 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
3527 if (attr
== &dev_attr_microamps
.attr
)
3528 return ops
->get_current_limit
? mode
: 0;
3530 if (attr
== &dev_attr_opmode
.attr
)
3531 return ops
->get_mode
? mode
: 0;
3533 if (attr
== &dev_attr_state
.attr
)
3534 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
3536 if (attr
== &dev_attr_status
.attr
)
3537 return ops
->get_status
? mode
: 0;
3539 if (attr
== &dev_attr_bypass
.attr
)
3540 return ops
->get_bypass
? mode
: 0;
3542 /* some attributes are type-specific */
3543 if (attr
== &dev_attr_requested_microamps
.attr
)
3544 return rdev
->desc
->type
== REGULATOR_CURRENT
? mode
: 0;
3546 /* constraints need specific supporting methods */
3547 if (attr
== &dev_attr_min_microvolts
.attr
||
3548 attr
== &dev_attr_max_microvolts
.attr
)
3549 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
3551 if (attr
== &dev_attr_min_microamps
.attr
||
3552 attr
== &dev_attr_max_microamps
.attr
)
3553 return ops
->set_current_limit
? mode
: 0;
3555 if (attr
== &dev_attr_suspend_standby_state
.attr
||
3556 attr
== &dev_attr_suspend_mem_state
.attr
||
3557 attr
== &dev_attr_suspend_disk_state
.attr
)
3560 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
3561 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
3562 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
3563 return ops
->set_suspend_voltage
? mode
: 0;
3565 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
3566 attr
== &dev_attr_suspend_mem_mode
.attr
||
3567 attr
== &dev_attr_suspend_disk_mode
.attr
)
3568 return ops
->set_suspend_mode
? mode
: 0;
3573 static const struct attribute_group regulator_dev_group
= {
3574 .attrs
= regulator_dev_attrs
,
3575 .is_visible
= regulator_attr_is_visible
,
3578 static const struct attribute_group
*regulator_dev_groups
[] = {
3579 ®ulator_dev_group
,
3583 static void regulator_dev_release(struct device
*dev
)
3585 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
3589 static struct class regulator_class
= {
3590 .name
= "regulator",
3591 .dev_release
= regulator_dev_release
,
3592 .dev_groups
= regulator_dev_groups
,
3595 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3597 struct device
*parent
= rdev
->dev
.parent
;
3598 const char *rname
= rdev_get_name(rdev
);
3599 char name
[NAME_MAX
];
3601 /* Avoid duplicate debugfs directory names */
3602 if (parent
&& rname
== rdev
->desc
->name
) {
3603 snprintf(name
, sizeof(name
), "%s-%s", dev_name(parent
),
3608 rdev
->debugfs
= debugfs_create_dir(rname
, debugfs_root
);
3609 if (!rdev
->debugfs
) {
3610 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3614 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3616 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3618 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3619 &rdev
->bypass_count
);
3623 * regulator_register - register regulator
3624 * @regulator_desc: regulator to register
3625 * @cfg: runtime configuration for regulator
3627 * Called by regulator drivers to register a regulator.
3628 * Returns a valid pointer to struct regulator_dev on success
3629 * or an ERR_PTR() on error.
3631 struct regulator_dev
*
3632 regulator_register(const struct regulator_desc
*regulator_desc
,
3633 const struct regulator_config
*cfg
)
3635 const struct regulation_constraints
*constraints
= NULL
;
3636 const struct regulator_init_data
*init_data
;
3637 struct regulator_config
*config
= NULL
;
3638 static atomic_t regulator_no
= ATOMIC_INIT(-1);
3639 struct regulator_dev
*rdev
;
3643 if (regulator_desc
== NULL
|| cfg
== NULL
)
3644 return ERR_PTR(-EINVAL
);
3649 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3650 return ERR_PTR(-EINVAL
);
3652 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3653 regulator_desc
->type
!= REGULATOR_CURRENT
)
3654 return ERR_PTR(-EINVAL
);
3656 /* Only one of each should be implemented */
3657 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3658 regulator_desc
->ops
->get_voltage_sel
);
3659 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3660 regulator_desc
->ops
->set_voltage_sel
);
3662 /* If we're using selectors we must implement list_voltage. */
3663 if (regulator_desc
->ops
->get_voltage_sel
&&
3664 !regulator_desc
->ops
->list_voltage
) {
3665 return ERR_PTR(-EINVAL
);
3667 if (regulator_desc
->ops
->set_voltage_sel
&&
3668 !regulator_desc
->ops
->list_voltage
) {
3669 return ERR_PTR(-EINVAL
);
3672 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3674 return ERR_PTR(-ENOMEM
);
3677 * Duplicate the config so the driver could override it after
3678 * parsing init data.
3680 config
= kmemdup(cfg
, sizeof(*cfg
), GFP_KERNEL
);
3681 if (config
== NULL
) {
3683 return ERR_PTR(-ENOMEM
);
3686 init_data
= regulator_of_get_init_data(dev
, regulator_desc
, config
,
3687 &rdev
->dev
.of_node
);
3689 init_data
= config
->init_data
;
3690 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
3693 mutex_lock(®ulator_list_mutex
);
3695 mutex_init(&rdev
->mutex
);
3696 rdev
->reg_data
= config
->driver_data
;
3697 rdev
->owner
= regulator_desc
->owner
;
3698 rdev
->desc
= regulator_desc
;
3700 rdev
->regmap
= config
->regmap
;
3701 else if (dev_get_regmap(dev
, NULL
))
3702 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3703 else if (dev
->parent
)
3704 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3705 INIT_LIST_HEAD(&rdev
->consumer_list
);
3706 INIT_LIST_HEAD(&rdev
->list
);
3707 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3708 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3710 /* preform any regulator specific init */
3711 if (init_data
&& init_data
->regulator_init
) {
3712 ret
= init_data
->regulator_init(rdev
->reg_data
);
3717 /* register with sysfs */
3718 rdev
->dev
.class = ®ulator_class
;
3719 rdev
->dev
.parent
= dev
;
3720 dev_set_name(&rdev
->dev
, "regulator.%lu",
3721 (unsigned long) atomic_inc_return(®ulator_no
));
3722 ret
= device_register(&rdev
->dev
);
3724 put_device(&rdev
->dev
);
3728 dev_set_drvdata(&rdev
->dev
, rdev
);
3730 if ((config
->ena_gpio
|| config
->ena_gpio_initialized
) &&
3731 gpio_is_valid(config
->ena_gpio
)) {
3732 ret
= regulator_ena_gpio_request(rdev
, config
);
3734 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3735 config
->ena_gpio
, ret
);
3740 /* set regulator constraints */
3742 constraints
= &init_data
->constraints
;
3744 ret
= set_machine_constraints(rdev
, constraints
);
3748 if (init_data
&& init_data
->supply_regulator
)
3749 rdev
->supply_name
= init_data
->supply_regulator
;
3750 else if (regulator_desc
->supply_name
)
3751 rdev
->supply_name
= regulator_desc
->supply_name
;
3753 /* add consumers devices */
3755 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3756 ret
= set_consumer_device_supply(rdev
,
3757 init_data
->consumer_supplies
[i
].dev_name
,
3758 init_data
->consumer_supplies
[i
].supply
);
3760 dev_err(dev
, "Failed to set supply %s\n",
3761 init_data
->consumer_supplies
[i
].supply
);
3762 goto unset_supplies
;
3767 list_add(&rdev
->list
, ®ulator_list
);
3769 rdev_init_debugfs(rdev
);
3771 mutex_unlock(®ulator_list_mutex
);
3776 unset_regulator_supplies(rdev
);
3779 regulator_ena_gpio_free(rdev
);
3780 kfree(rdev
->constraints
);
3782 device_unregister(&rdev
->dev
);
3783 /* device core frees rdev */
3784 rdev
= ERR_PTR(ret
);
3789 rdev
= ERR_PTR(ret
);
3792 EXPORT_SYMBOL_GPL(regulator_register
);
3795 * regulator_unregister - unregister regulator
3796 * @rdev: regulator to unregister
3798 * Called by regulator drivers to unregister a regulator.
3800 void regulator_unregister(struct regulator_dev
*rdev
)
3806 while (rdev
->use_count
--)
3807 regulator_disable(rdev
->supply
);
3808 regulator_put(rdev
->supply
);
3810 mutex_lock(®ulator_list_mutex
);
3811 debugfs_remove_recursive(rdev
->debugfs
);
3812 flush_work(&rdev
->disable_work
.work
);
3813 WARN_ON(rdev
->open_count
);
3814 unset_regulator_supplies(rdev
);
3815 list_del(&rdev
->list
);
3816 kfree(rdev
->constraints
);
3817 regulator_ena_gpio_free(rdev
);
3818 of_node_put(rdev
->dev
.of_node
);
3819 device_unregister(&rdev
->dev
);
3820 mutex_unlock(®ulator_list_mutex
);
3822 EXPORT_SYMBOL_GPL(regulator_unregister
);
3825 * regulator_suspend_prepare - prepare regulators for system wide suspend
3826 * @state: system suspend state
3828 * Configure each regulator with it's suspend operating parameters for state.
3829 * This will usually be called by machine suspend code prior to supending.
3831 int regulator_suspend_prepare(suspend_state_t state
)
3833 struct regulator_dev
*rdev
;
3836 /* ON is handled by regulator active state */
3837 if (state
== PM_SUSPEND_ON
)
3840 mutex_lock(®ulator_list_mutex
);
3841 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3843 mutex_lock(&rdev
->mutex
);
3844 ret
= suspend_prepare(rdev
, state
);
3845 mutex_unlock(&rdev
->mutex
);
3848 rdev_err(rdev
, "failed to prepare\n");
3853 mutex_unlock(®ulator_list_mutex
);
3856 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3859 * regulator_suspend_finish - resume regulators from system wide suspend
3861 * Turn on regulators that might be turned off by regulator_suspend_prepare
3862 * and that should be turned on according to the regulators properties.
3864 int regulator_suspend_finish(void)
3866 struct regulator_dev
*rdev
;
3869 mutex_lock(®ulator_list_mutex
);
3870 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3871 mutex_lock(&rdev
->mutex
);
3872 if (rdev
->use_count
> 0 || rdev
->constraints
->always_on
) {
3873 if (!_regulator_is_enabled(rdev
)) {
3874 error
= _regulator_do_enable(rdev
);
3879 if (!have_full_constraints())
3881 if (!_regulator_is_enabled(rdev
))
3884 error
= _regulator_do_disable(rdev
);
3889 mutex_unlock(&rdev
->mutex
);
3891 mutex_unlock(®ulator_list_mutex
);
3894 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3897 * regulator_has_full_constraints - the system has fully specified constraints
3899 * Calling this function will cause the regulator API to disable all
3900 * regulators which have a zero use count and don't have an always_on
3901 * constraint in a late_initcall.
3903 * The intention is that this will become the default behaviour in a
3904 * future kernel release so users are encouraged to use this facility
3907 void regulator_has_full_constraints(void)
3909 has_full_constraints
= 1;
3911 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3914 * rdev_get_drvdata - get rdev regulator driver data
3917 * Get rdev regulator driver private data. This call can be used in the
3918 * regulator driver context.
3920 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3922 return rdev
->reg_data
;
3924 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3927 * regulator_get_drvdata - get regulator driver data
3928 * @regulator: regulator
3930 * Get regulator driver private data. This call can be used in the consumer
3931 * driver context when non API regulator specific functions need to be called.
3933 void *regulator_get_drvdata(struct regulator
*regulator
)
3935 return regulator
->rdev
->reg_data
;
3937 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3940 * regulator_set_drvdata - set regulator driver data
3941 * @regulator: regulator
3944 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3946 regulator
->rdev
->reg_data
= data
;
3948 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3951 * regulator_get_id - get regulator ID
3954 int rdev_get_id(struct regulator_dev
*rdev
)
3956 return rdev
->desc
->id
;
3958 EXPORT_SYMBOL_GPL(rdev_get_id
);
3960 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3964 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3966 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3968 return reg_init_data
->driver_data
;
3970 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3972 #ifdef CONFIG_DEBUG_FS
3973 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3974 size_t count
, loff_t
*ppos
)
3976 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3977 ssize_t len
, ret
= 0;
3978 struct regulator_map
*map
;
3983 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3984 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3986 rdev_get_name(map
->regulator
), map
->dev_name
,
3990 if (ret
> PAGE_SIZE
) {
3996 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
4004 static const struct file_operations supply_map_fops
= {
4005 #ifdef CONFIG_DEBUG_FS
4006 .read
= supply_map_read_file
,
4007 .llseek
= default_llseek
,
4011 #ifdef CONFIG_DEBUG_FS
4012 static void regulator_summary_show_subtree(struct seq_file
*s
,
4013 struct regulator_dev
*rdev
,
4016 struct list_head
*list
= s
->private;
4017 struct regulator_dev
*child
;
4018 struct regulation_constraints
*c
;
4019 struct regulator
*consumer
;
4024 seq_printf(s
, "%*s%-*s %3d %4d %6d ",
4026 30 - level
* 3, rdev_get_name(rdev
),
4027 rdev
->use_count
, rdev
->open_count
, rdev
->bypass_count
);
4029 seq_printf(s
, "%5dmV ", _regulator_get_voltage(rdev
) / 1000);
4030 seq_printf(s
, "%5dmA ", _regulator_get_current_limit(rdev
) / 1000);
4032 c
= rdev
->constraints
;
4034 switch (rdev
->desc
->type
) {
4035 case REGULATOR_VOLTAGE
:
4036 seq_printf(s
, "%5dmV %5dmV ",
4037 c
->min_uV
/ 1000, c
->max_uV
/ 1000);
4039 case REGULATOR_CURRENT
:
4040 seq_printf(s
, "%5dmA %5dmA ",
4041 c
->min_uA
/ 1000, c
->max_uA
/ 1000);
4048 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
) {
4049 if (consumer
->dev
->class == ®ulator_class
)
4052 seq_printf(s
, "%*s%-*s ",
4053 (level
+ 1) * 3 + 1, "",
4054 30 - (level
+ 1) * 3, dev_name(consumer
->dev
));
4056 switch (rdev
->desc
->type
) {
4057 case REGULATOR_VOLTAGE
:
4058 seq_printf(s
, "%37dmV %5dmV",
4059 consumer
->min_uV
/ 1000,
4060 consumer
->max_uV
/ 1000);
4062 case REGULATOR_CURRENT
:
4069 list_for_each_entry(child
, list
, list
) {
4070 /* handle only non-root regulators supplied by current rdev */
4071 if (!child
->supply
|| child
->supply
->rdev
!= rdev
)
4074 regulator_summary_show_subtree(s
, child
, level
+ 1);
4078 static int regulator_summary_show(struct seq_file
*s
, void *data
)
4080 struct list_head
*list
= s
->private;
4081 struct regulator_dev
*rdev
;
4083 seq_puts(s
, " regulator use open bypass voltage current min max\n");
4084 seq_puts(s
, "-------------------------------------------------------------------------------\n");
4086 mutex_lock(®ulator_list_mutex
);
4088 list_for_each_entry(rdev
, list
, list
) {
4092 regulator_summary_show_subtree(s
, rdev
, 0);
4095 mutex_unlock(®ulator_list_mutex
);
4100 static int regulator_summary_open(struct inode
*inode
, struct file
*file
)
4102 return single_open(file
, regulator_summary_show
, inode
->i_private
);
4106 static const struct file_operations regulator_summary_fops
= {
4107 #ifdef CONFIG_DEBUG_FS
4108 .open
= regulator_summary_open
,
4110 .llseek
= seq_lseek
,
4111 .release
= single_release
,
4115 static int __init
regulator_init(void)
4119 ret
= class_register(®ulator_class
);
4121 debugfs_root
= debugfs_create_dir("regulator", NULL
);
4123 pr_warn("regulator: Failed to create debugfs directory\n");
4125 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
4128 debugfs_create_file("regulator_summary", 0444, debugfs_root
,
4129 ®ulator_list
, ®ulator_summary_fops
);
4131 regulator_dummy_init();
4136 /* init early to allow our consumers to complete system booting */
4137 core_initcall(regulator_init
);
4139 static int __init
regulator_init_complete(void)
4141 struct regulator_dev
*rdev
;
4142 const struct regulator_ops
*ops
;
4143 struct regulation_constraints
*c
;
4147 * Since DT doesn't provide an idiomatic mechanism for
4148 * enabling full constraints and since it's much more natural
4149 * with DT to provide them just assume that a DT enabled
4150 * system has full constraints.
4152 if (of_have_populated_dt())
4153 has_full_constraints
= true;
4155 mutex_lock(®ulator_list_mutex
);
4157 /* If we have a full configuration then disable any regulators
4158 * we have permission to change the status for and which are
4159 * not in use or always_on. This is effectively the default
4160 * for DT and ACPI as they have full constraints.
4162 list_for_each_entry(rdev
, ®ulator_list
, list
) {
4163 ops
= rdev
->desc
->ops
;
4164 c
= rdev
->constraints
;
4166 if (c
&& c
->always_on
)
4169 if (c
&& !(c
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
))
4172 mutex_lock(&rdev
->mutex
);
4174 if (rdev
->use_count
)
4177 /* If we can't read the status assume it's on. */
4178 if (ops
->is_enabled
)
4179 enabled
= ops
->is_enabled(rdev
);
4186 if (have_full_constraints()) {
4187 /* We log since this may kill the system if it
4189 rdev_info(rdev
, "disabling\n");
4190 ret
= _regulator_do_disable(rdev
);
4192 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4194 /* The intention is that in future we will
4195 * assume that full constraints are provided
4196 * so warn even if we aren't going to do
4199 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4203 mutex_unlock(&rdev
->mutex
);
4206 mutex_unlock(®ulator_list_mutex
);
4210 late_initcall_sync(regulator_init_complete
);