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 void drms_uA_update(struct regulator_dev
*rdev
)
639 struct regulator
*sibling
;
640 int current_uA
= 0, output_uV
, input_uV
, err
;
643 err
= regulator_check_drms(rdev
);
644 if (err
< 0 || !rdev
->desc
->ops
->get_optimum_mode
||
645 (!rdev
->desc
->ops
->get_voltage
&&
646 !rdev
->desc
->ops
->get_voltage_sel
) ||
647 !rdev
->desc
->ops
->set_mode
)
650 /* get output voltage */
651 output_uV
= _regulator_get_voltage(rdev
);
655 /* get input voltage */
658 input_uV
= regulator_get_voltage(rdev
->supply
);
660 input_uV
= rdev
->constraints
->input_uV
;
664 /* calc total requested load */
665 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
666 current_uA
+= sibling
->uA_load
;
668 /* now get the optimum mode for our new total regulator load */
669 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
670 output_uV
, current_uA
);
672 /* check the new mode is allowed */
673 err
= regulator_mode_constrain(rdev
, &mode
);
675 rdev
->desc
->ops
->set_mode(rdev
, mode
);
678 static int suspend_set_state(struct regulator_dev
*rdev
,
679 struct regulator_state
*rstate
)
683 /* If we have no suspend mode configration don't set anything;
684 * only warn if the driver implements set_suspend_voltage or
685 * set_suspend_mode callback.
687 if (!rstate
->enabled
&& !rstate
->disabled
) {
688 if (rdev
->desc
->ops
->set_suspend_voltage
||
689 rdev
->desc
->ops
->set_suspend_mode
)
690 rdev_warn(rdev
, "No configuration\n");
694 if (rstate
->enabled
&& rstate
->disabled
) {
695 rdev_err(rdev
, "invalid configuration\n");
699 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
700 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
701 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
702 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
703 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
707 rdev_err(rdev
, "failed to enabled/disable\n");
711 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
712 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
714 rdev_err(rdev
, "failed to set voltage\n");
719 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
720 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
722 rdev_err(rdev
, "failed to set mode\n");
729 /* locks held by caller */
730 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
732 if (!rdev
->constraints
)
736 case PM_SUSPEND_STANDBY
:
737 return suspend_set_state(rdev
,
738 &rdev
->constraints
->state_standby
);
740 return suspend_set_state(rdev
,
741 &rdev
->constraints
->state_mem
);
743 return suspend_set_state(rdev
,
744 &rdev
->constraints
->state_disk
);
750 static void print_constraints(struct regulator_dev
*rdev
)
752 struct regulation_constraints
*constraints
= rdev
->constraints
;
757 if (constraints
->min_uV
&& constraints
->max_uV
) {
758 if (constraints
->min_uV
== constraints
->max_uV
)
759 count
+= sprintf(buf
+ count
, "%d mV ",
760 constraints
->min_uV
/ 1000);
762 count
+= sprintf(buf
+ count
, "%d <--> %d mV ",
763 constraints
->min_uV
/ 1000,
764 constraints
->max_uV
/ 1000);
767 if (!constraints
->min_uV
||
768 constraints
->min_uV
!= constraints
->max_uV
) {
769 ret
= _regulator_get_voltage(rdev
);
771 count
+= sprintf(buf
+ count
, "at %d mV ", ret
/ 1000);
774 if (constraints
->uV_offset
)
775 count
+= sprintf(buf
, "%dmV offset ",
776 constraints
->uV_offset
/ 1000);
778 if (constraints
->min_uA
&& constraints
->max_uA
) {
779 if (constraints
->min_uA
== constraints
->max_uA
)
780 count
+= sprintf(buf
+ count
, "%d mA ",
781 constraints
->min_uA
/ 1000);
783 count
+= sprintf(buf
+ count
, "%d <--> %d mA ",
784 constraints
->min_uA
/ 1000,
785 constraints
->max_uA
/ 1000);
788 if (!constraints
->min_uA
||
789 constraints
->min_uA
!= constraints
->max_uA
) {
790 ret
= _regulator_get_current_limit(rdev
);
792 count
+= sprintf(buf
+ count
, "at %d mA ", ret
/ 1000);
795 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
796 count
+= sprintf(buf
+ count
, "fast ");
797 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
798 count
+= sprintf(buf
+ count
, "normal ");
799 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
800 count
+= sprintf(buf
+ count
, "idle ");
801 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
802 count
+= sprintf(buf
+ count
, "standby");
805 sprintf(buf
, "no parameters");
807 rdev_dbg(rdev
, "%s\n", buf
);
809 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
810 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
812 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
815 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
816 struct regulation_constraints
*constraints
)
818 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
821 /* do we need to apply the constraint voltage */
822 if (rdev
->constraints
->apply_uV
&&
823 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
824 int current_uV
= _regulator_get_voltage(rdev
);
825 if (current_uV
< 0) {
827 "failed to get the current voltage(%d)\n",
831 if (current_uV
< rdev
->constraints
->min_uV
||
832 current_uV
> rdev
->constraints
->max_uV
) {
833 ret
= _regulator_do_set_voltage(
834 rdev
, rdev
->constraints
->min_uV
,
835 rdev
->constraints
->max_uV
);
838 "failed to apply %duV constraint(%d)\n",
839 rdev
->constraints
->min_uV
, ret
);
845 /* constrain machine-level voltage specs to fit
846 * the actual range supported by this regulator.
848 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
849 int count
= rdev
->desc
->n_voltages
;
851 int min_uV
= INT_MAX
;
852 int max_uV
= INT_MIN
;
853 int cmin
= constraints
->min_uV
;
854 int cmax
= constraints
->max_uV
;
856 /* it's safe to autoconfigure fixed-voltage supplies
857 and the constraints are used by list_voltage. */
858 if (count
== 1 && !cmin
) {
861 constraints
->min_uV
= cmin
;
862 constraints
->max_uV
= cmax
;
865 /* voltage constraints are optional */
866 if ((cmin
== 0) && (cmax
== 0))
869 /* else require explicit machine-level constraints */
870 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
871 rdev_err(rdev
, "invalid voltage constraints\n");
875 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
876 for (i
= 0; i
< count
; i
++) {
879 value
= ops
->list_voltage(rdev
, i
);
883 /* maybe adjust [min_uV..max_uV] */
884 if (value
>= cmin
&& value
< min_uV
)
886 if (value
<= cmax
&& value
> max_uV
)
890 /* final: [min_uV..max_uV] valid iff constraints valid */
891 if (max_uV
< min_uV
) {
893 "unsupportable voltage constraints %u-%uuV\n",
898 /* use regulator's subset of machine constraints */
899 if (constraints
->min_uV
< min_uV
) {
900 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
901 constraints
->min_uV
, min_uV
);
902 constraints
->min_uV
= min_uV
;
904 if (constraints
->max_uV
> max_uV
) {
905 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
906 constraints
->max_uV
, max_uV
);
907 constraints
->max_uV
= max_uV
;
914 static int machine_constraints_current(struct regulator_dev
*rdev
,
915 struct regulation_constraints
*constraints
)
917 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
920 if (!constraints
->min_uA
&& !constraints
->max_uA
)
923 if (constraints
->min_uA
> constraints
->max_uA
) {
924 rdev_err(rdev
, "Invalid current constraints\n");
928 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
929 rdev_warn(rdev
, "Operation of current configuration missing\n");
933 /* Set regulator current in constraints range */
934 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
935 constraints
->max_uA
);
937 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
944 static int _regulator_do_enable(struct regulator_dev
*rdev
);
947 * set_machine_constraints - sets regulator constraints
948 * @rdev: regulator source
949 * @constraints: constraints to apply
951 * Allows platform initialisation code to define and constrain
952 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
953 * Constraints *must* be set by platform code in order for some
954 * regulator operations to proceed i.e. set_voltage, set_current_limit,
957 static int set_machine_constraints(struct regulator_dev
*rdev
,
958 const struct regulation_constraints
*constraints
)
961 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
964 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
967 rdev
->constraints
= kzalloc(sizeof(*constraints
),
969 if (!rdev
->constraints
)
972 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
976 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
980 /* do we need to setup our suspend state */
981 if (rdev
->constraints
->initial_state
) {
982 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
984 rdev_err(rdev
, "failed to set suspend state\n");
989 if (rdev
->constraints
->initial_mode
) {
990 if (!ops
->set_mode
) {
991 rdev_err(rdev
, "no set_mode operation\n");
996 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
998 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1003 /* If the constraints say the regulator should be on at this point
1004 * and we have control then make sure it is enabled.
1006 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
1007 ret
= _regulator_do_enable(rdev
);
1008 if (ret
< 0 && ret
!= -EINVAL
) {
1009 rdev_err(rdev
, "failed to enable\n");
1014 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1015 && ops
->set_ramp_delay
) {
1016 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1018 rdev_err(rdev
, "failed to set ramp_delay\n");
1023 print_constraints(rdev
);
1026 kfree(rdev
->constraints
);
1027 rdev
->constraints
= NULL
;
1032 * set_supply - set regulator supply regulator
1033 * @rdev: regulator name
1034 * @supply_rdev: supply regulator name
1036 * Called by platform initialisation code to set the supply regulator for this
1037 * regulator. This ensures that a regulators supply will also be enabled by the
1038 * core if it's child is enabled.
1040 static int set_supply(struct regulator_dev
*rdev
,
1041 struct regulator_dev
*supply_rdev
)
1045 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1047 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1048 if (rdev
->supply
== NULL
) {
1052 supply_rdev
->open_count
++;
1058 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1059 * @rdev: regulator source
1060 * @consumer_dev_name: dev_name() string for device supply applies to
1061 * @supply: symbolic name for supply
1063 * Allows platform initialisation code to map physical regulator
1064 * sources to symbolic names for supplies for use by devices. Devices
1065 * should use these symbolic names to request regulators, avoiding the
1066 * need to provide board-specific regulator names as platform data.
1068 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1069 const char *consumer_dev_name
,
1072 struct regulator_map
*node
;
1078 if (consumer_dev_name
!= NULL
)
1083 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1084 if (node
->dev_name
&& consumer_dev_name
) {
1085 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1087 } else if (node
->dev_name
|| consumer_dev_name
) {
1091 if (strcmp(node
->supply
, supply
) != 0)
1094 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1096 dev_name(&node
->regulator
->dev
),
1097 node
->regulator
->desc
->name
,
1099 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1103 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1107 node
->regulator
= rdev
;
1108 node
->supply
= supply
;
1111 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1112 if (node
->dev_name
== NULL
) {
1118 list_add(&node
->list
, ®ulator_map_list
);
1122 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1124 struct regulator_map
*node
, *n
;
1126 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1127 if (rdev
== node
->regulator
) {
1128 list_del(&node
->list
);
1129 kfree(node
->dev_name
);
1135 #define REG_STR_SIZE 64
1137 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1139 const char *supply_name
)
1141 struct regulator
*regulator
;
1142 char buf
[REG_STR_SIZE
];
1145 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1146 if (regulator
== NULL
)
1149 mutex_lock(&rdev
->mutex
);
1150 regulator
->rdev
= rdev
;
1151 list_add(®ulator
->list
, &rdev
->consumer_list
);
1154 regulator
->dev
= dev
;
1156 /* Add a link to the device sysfs entry */
1157 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1158 dev
->kobj
.name
, supply_name
);
1159 if (size
>= REG_STR_SIZE
)
1162 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1163 if (regulator
->supply_name
== NULL
)
1166 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1169 rdev_warn(rdev
, "could not add device link %s err %d\n",
1170 dev
->kobj
.name
, err
);
1174 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1175 if (regulator
->supply_name
== NULL
)
1179 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1181 if (!regulator
->debugfs
) {
1182 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1184 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1185 ®ulator
->uA_load
);
1186 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1187 ®ulator
->min_uV
);
1188 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1189 ®ulator
->max_uV
);
1193 * Check now if the regulator is an always on regulator - if
1194 * it is then we don't need to do nearly so much work for
1195 * enable/disable calls.
1197 if (!_regulator_can_change_status(rdev
) &&
1198 _regulator_is_enabled(rdev
))
1199 regulator
->always_on
= true;
1201 mutex_unlock(&rdev
->mutex
);
1204 list_del(®ulator
->list
);
1206 mutex_unlock(&rdev
->mutex
);
1210 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1212 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1213 return rdev
->constraints
->enable_time
;
1214 if (!rdev
->desc
->ops
->enable_time
)
1215 return rdev
->desc
->enable_time
;
1216 return rdev
->desc
->ops
->enable_time(rdev
);
1219 static struct regulator_supply_alias
*regulator_find_supply_alias(
1220 struct device
*dev
, const char *supply
)
1222 struct regulator_supply_alias
*map
;
1224 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1225 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1231 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1233 struct regulator_supply_alias
*map
;
1235 map
= regulator_find_supply_alias(*dev
, *supply
);
1237 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1238 *supply
, map
->alias_supply
,
1239 dev_name(map
->alias_dev
));
1240 *dev
= map
->alias_dev
;
1241 *supply
= map
->alias_supply
;
1245 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1249 struct regulator_dev
*r
;
1250 struct device_node
*node
;
1251 struct regulator_map
*map
;
1252 const char *devname
= NULL
;
1254 regulator_supply_alias(&dev
, &supply
);
1256 /* first do a dt based lookup */
1257 if (dev
&& dev
->of_node
) {
1258 node
= of_get_regulator(dev
, supply
);
1260 list_for_each_entry(r
, ®ulator_list
, list
)
1261 if (r
->dev
.parent
&&
1262 node
== r
->dev
.of_node
)
1264 *ret
= -EPROBE_DEFER
;
1268 * If we couldn't even get the node then it's
1269 * not just that the device didn't register
1270 * yet, there's no node and we'll never
1277 /* if not found, try doing it non-dt way */
1279 devname
= dev_name(dev
);
1281 list_for_each_entry(r
, ®ulator_list
, list
)
1282 if (strcmp(rdev_get_name(r
), supply
) == 0)
1285 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1286 /* If the mapping has a device set up it must match */
1287 if (map
->dev_name
&&
1288 (!devname
|| strcmp(map
->dev_name
, devname
)))
1291 if (strcmp(map
->supply
, supply
) == 0)
1292 return map
->regulator
;
1299 /* Internal regulator request function */
1300 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1301 bool exclusive
, bool allow_dummy
)
1303 struct regulator_dev
*rdev
;
1304 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1305 const char *devname
= NULL
;
1309 pr_err("get() with no identifier\n");
1310 return ERR_PTR(-EINVAL
);
1314 devname
= dev_name(dev
);
1316 if (have_full_constraints())
1319 ret
= -EPROBE_DEFER
;
1321 mutex_lock(®ulator_list_mutex
);
1323 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1327 regulator
= ERR_PTR(ret
);
1330 * If we have return value from dev_lookup fail, we do not expect to
1331 * succeed, so, quit with appropriate error value
1333 if (ret
&& ret
!= -ENODEV
)
1337 devname
= "deviceless";
1340 * Assume that a regulator is physically present and enabled
1341 * even if it isn't hooked up and just provide a dummy.
1343 if (have_full_constraints() && allow_dummy
) {
1344 pr_warn("%s supply %s not found, using dummy regulator\n",
1347 rdev
= dummy_regulator_rdev
;
1349 /* Don't log an error when called from regulator_get_optional() */
1350 } else if (!have_full_constraints() || exclusive
) {
1351 dev_warn(dev
, "dummy supplies not allowed\n");
1354 mutex_unlock(®ulator_list_mutex
);
1358 if (rdev
->exclusive
) {
1359 regulator
= ERR_PTR(-EPERM
);
1363 if (exclusive
&& rdev
->open_count
) {
1364 regulator
= ERR_PTR(-EBUSY
);
1368 if (!try_module_get(rdev
->owner
))
1371 regulator
= create_regulator(rdev
, dev
, id
);
1372 if (regulator
== NULL
) {
1373 regulator
= ERR_PTR(-ENOMEM
);
1374 module_put(rdev
->owner
);
1380 rdev
->exclusive
= 1;
1382 ret
= _regulator_is_enabled(rdev
);
1384 rdev
->use_count
= 1;
1386 rdev
->use_count
= 0;
1390 mutex_unlock(®ulator_list_mutex
);
1396 * regulator_get - lookup and obtain a reference to a regulator.
1397 * @dev: device for regulator "consumer"
1398 * @id: Supply name or regulator ID.
1400 * Returns a struct regulator corresponding to the regulator producer,
1401 * or IS_ERR() condition containing errno.
1403 * Use of supply names configured via regulator_set_device_supply() is
1404 * strongly encouraged. It is recommended that the supply name used
1405 * should match the name used for the supply and/or the relevant
1406 * device pins in the datasheet.
1408 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1410 return _regulator_get(dev
, id
, false, true);
1412 EXPORT_SYMBOL_GPL(regulator_get
);
1415 * regulator_get_exclusive - obtain exclusive access to a regulator.
1416 * @dev: device for regulator "consumer"
1417 * @id: Supply name or regulator ID.
1419 * Returns a struct regulator corresponding to the regulator producer,
1420 * or IS_ERR() condition containing errno. Other consumers will be
1421 * unable to obtain this regulator while this reference is held and the
1422 * use count for the regulator will be initialised to reflect the current
1423 * state of the regulator.
1425 * This is intended for use by consumers which cannot tolerate shared
1426 * use of the regulator such as those which need to force the
1427 * regulator off for correct operation of the hardware they are
1430 * Use of supply names configured via regulator_set_device_supply() is
1431 * strongly encouraged. It is recommended that the supply name used
1432 * should match the name used for the supply and/or the relevant
1433 * device pins in the datasheet.
1435 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1437 return _regulator_get(dev
, id
, true, false);
1439 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1442 * regulator_get_optional - obtain optional access to a regulator.
1443 * @dev: device for regulator "consumer"
1444 * @id: Supply name or regulator ID.
1446 * Returns a struct regulator corresponding to the regulator producer,
1447 * or IS_ERR() condition containing errno.
1449 * This is intended for use by consumers for devices which can have
1450 * some supplies unconnected in normal use, such as some MMC devices.
1451 * It can allow the regulator core to provide stub supplies for other
1452 * supplies requested using normal regulator_get() calls without
1453 * disrupting the operation of drivers that can handle absent
1456 * Use of supply names configured via regulator_set_device_supply() is
1457 * strongly encouraged. It is recommended that the supply name used
1458 * should match the name used for the supply and/or the relevant
1459 * device pins in the datasheet.
1461 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1463 return _regulator_get(dev
, id
, false, false);
1465 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1467 /* Locks held by regulator_put() */
1468 static void _regulator_put(struct regulator
*regulator
)
1470 struct regulator_dev
*rdev
;
1472 if (regulator
== NULL
|| IS_ERR(regulator
))
1475 rdev
= regulator
->rdev
;
1477 debugfs_remove_recursive(regulator
->debugfs
);
1479 /* remove any sysfs entries */
1481 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1482 kfree(regulator
->supply_name
);
1483 list_del(®ulator
->list
);
1487 rdev
->exclusive
= 0;
1489 module_put(rdev
->owner
);
1493 * regulator_put - "free" the regulator source
1494 * @regulator: regulator source
1496 * Note: drivers must ensure that all regulator_enable calls made on this
1497 * regulator source are balanced by regulator_disable calls prior to calling
1500 void regulator_put(struct regulator
*regulator
)
1502 mutex_lock(®ulator_list_mutex
);
1503 _regulator_put(regulator
);
1504 mutex_unlock(®ulator_list_mutex
);
1506 EXPORT_SYMBOL_GPL(regulator_put
);
1509 * regulator_register_supply_alias - Provide device alias for supply lookup
1511 * @dev: device that will be given as the regulator "consumer"
1512 * @id: Supply name or regulator ID
1513 * @alias_dev: device that should be used to lookup the supply
1514 * @alias_id: Supply name or regulator ID that should be used to lookup the
1517 * All lookups for id on dev will instead be conducted for alias_id on
1520 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1521 struct device
*alias_dev
,
1522 const char *alias_id
)
1524 struct regulator_supply_alias
*map
;
1526 map
= regulator_find_supply_alias(dev
, id
);
1530 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1535 map
->src_supply
= id
;
1536 map
->alias_dev
= alias_dev
;
1537 map
->alias_supply
= alias_id
;
1539 list_add(&map
->list
, ®ulator_supply_alias_list
);
1541 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1542 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1546 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1549 * regulator_unregister_supply_alias - Remove device alias
1551 * @dev: device that will be given as the regulator "consumer"
1552 * @id: Supply name or regulator ID
1554 * Remove a lookup alias if one exists for id on dev.
1556 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1558 struct regulator_supply_alias
*map
;
1560 map
= regulator_find_supply_alias(dev
, id
);
1562 list_del(&map
->list
);
1566 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1569 * regulator_bulk_register_supply_alias - register multiple aliases
1571 * @dev: device that will be given as the regulator "consumer"
1572 * @id: List of supply names or regulator IDs
1573 * @alias_dev: device that should be used to lookup the supply
1574 * @alias_id: List of supply names or regulator IDs that should be used to
1576 * @num_id: Number of aliases to register
1578 * @return 0 on success, an errno on failure.
1580 * This helper function allows drivers to register several supply
1581 * aliases in one operation. If any of the aliases cannot be
1582 * registered any aliases that were registered will be removed
1583 * before returning to the caller.
1585 int regulator_bulk_register_supply_alias(struct device
*dev
,
1586 const char *const *id
,
1587 struct device
*alias_dev
,
1588 const char *const *alias_id
,
1594 for (i
= 0; i
< num_id
; ++i
) {
1595 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1605 "Failed to create supply alias %s,%s -> %s,%s\n",
1606 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1609 regulator_unregister_supply_alias(dev
, id
[i
]);
1613 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1616 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1618 * @dev: device that will be given as the regulator "consumer"
1619 * @id: List of supply names or regulator IDs
1620 * @num_id: Number of aliases to unregister
1622 * This helper function allows drivers to unregister several supply
1623 * aliases in one operation.
1625 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1626 const char *const *id
,
1631 for (i
= 0; i
< num_id
; ++i
)
1632 regulator_unregister_supply_alias(dev
, id
[i
]);
1634 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1637 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1638 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1639 const struct regulator_config
*config
)
1641 struct regulator_enable_gpio
*pin
;
1642 struct gpio_desc
*gpiod
;
1645 gpiod
= gpio_to_desc(config
->ena_gpio
);
1647 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1648 if (pin
->gpiod
== gpiod
) {
1649 rdev_dbg(rdev
, "GPIO %d is already used\n",
1651 goto update_ena_gpio_to_rdev
;
1655 ret
= gpio_request_one(config
->ena_gpio
,
1656 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1657 rdev_get_name(rdev
));
1661 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1663 gpio_free(config
->ena_gpio
);
1668 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1669 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1671 update_ena_gpio_to_rdev
:
1672 pin
->request_count
++;
1673 rdev
->ena_pin
= pin
;
1677 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1679 struct regulator_enable_gpio
*pin
, *n
;
1684 /* Free the GPIO only in case of no use */
1685 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1686 if (pin
->gpiod
== rdev
->ena_pin
->gpiod
) {
1687 if (pin
->request_count
<= 1) {
1688 pin
->request_count
= 0;
1689 gpiod_put(pin
->gpiod
);
1690 list_del(&pin
->list
);
1692 rdev
->ena_pin
= NULL
;
1695 pin
->request_count
--;
1702 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1703 * @rdev: regulator_dev structure
1704 * @enable: enable GPIO at initial use?
1706 * GPIO is enabled in case of initial use. (enable_count is 0)
1707 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1709 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1711 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1717 /* Enable GPIO at initial use */
1718 if (pin
->enable_count
== 0)
1719 gpiod_set_value_cansleep(pin
->gpiod
,
1720 !pin
->ena_gpio_invert
);
1722 pin
->enable_count
++;
1724 if (pin
->enable_count
> 1) {
1725 pin
->enable_count
--;
1729 /* Disable GPIO if not used */
1730 if (pin
->enable_count
<= 1) {
1731 gpiod_set_value_cansleep(pin
->gpiod
,
1732 pin
->ena_gpio_invert
);
1733 pin
->enable_count
= 0;
1741 * _regulator_enable_delay - a delay helper function
1742 * @delay: time to delay in microseconds
1744 * Delay for the requested amount of time as per the guidelines in:
1746 * Documentation/timers/timers-howto.txt
1748 * The assumption here is that regulators will never be enabled in
1749 * atomic context and therefore sleeping functions can be used.
1751 static void _regulator_enable_delay(unsigned int delay
)
1753 unsigned int ms
= delay
/ 1000;
1754 unsigned int us
= delay
% 1000;
1758 * For small enough values, handle super-millisecond
1759 * delays in the usleep_range() call below.
1768 * Give the scheduler some room to coalesce with any other
1769 * wakeup sources. For delays shorter than 10 us, don't even
1770 * bother setting up high-resolution timers and just busy-
1774 usleep_range(us
, us
+ 100);
1779 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1783 /* Query before enabling in case configuration dependent. */
1784 ret
= _regulator_get_enable_time(rdev
);
1788 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1792 trace_regulator_enable(rdev_get_name(rdev
));
1794 if (rdev
->desc
->off_on_delay
) {
1795 /* if needed, keep a distance of off_on_delay from last time
1796 * this regulator was disabled.
1798 unsigned long start_jiffy
= jiffies
;
1799 unsigned long intended
, max_delay
, remaining
;
1801 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
1802 intended
= rdev
->last_off_jiffy
+ max_delay
;
1804 if (time_before(start_jiffy
, intended
)) {
1805 /* calc remaining jiffies to deal with one-time
1807 * in case of multiple timer wrapping, either it can be
1808 * detected by out-of-range remaining, or it cannot be
1809 * detected and we gets a panelty of
1810 * _regulator_enable_delay().
1812 remaining
= intended
- start_jiffy
;
1813 if (remaining
<= max_delay
)
1814 _regulator_enable_delay(
1815 jiffies_to_usecs(remaining
));
1819 if (rdev
->ena_pin
) {
1820 ret
= regulator_ena_gpio_ctrl(rdev
, true);
1823 rdev
->ena_gpio_state
= 1;
1824 } else if (rdev
->desc
->ops
->enable
) {
1825 ret
= rdev
->desc
->ops
->enable(rdev
);
1832 /* Allow the regulator to ramp; it would be useful to extend
1833 * this for bulk operations so that the regulators can ramp
1835 trace_regulator_enable_delay(rdev_get_name(rdev
));
1837 _regulator_enable_delay(delay
);
1839 trace_regulator_enable_complete(rdev_get_name(rdev
));
1844 /* locks held by regulator_enable() */
1845 static int _regulator_enable(struct regulator_dev
*rdev
)
1849 /* check voltage and requested load before enabling */
1850 if (rdev
->constraints
&&
1851 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1852 drms_uA_update(rdev
);
1854 if (rdev
->use_count
== 0) {
1855 /* The regulator may on if it's not switchable or left on */
1856 ret
= _regulator_is_enabled(rdev
);
1857 if (ret
== -EINVAL
|| ret
== 0) {
1858 if (!_regulator_can_change_status(rdev
))
1861 ret
= _regulator_do_enable(rdev
);
1865 } else if (ret
< 0) {
1866 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1869 /* Fallthrough on positive return values - already enabled */
1878 * regulator_enable - enable regulator output
1879 * @regulator: regulator source
1881 * Request that the regulator be enabled with the regulator output at
1882 * the predefined voltage or current value. Calls to regulator_enable()
1883 * must be balanced with calls to regulator_disable().
1885 * NOTE: the output value can be set by other drivers, boot loader or may be
1886 * hardwired in the regulator.
1888 int regulator_enable(struct regulator
*regulator
)
1890 struct regulator_dev
*rdev
= regulator
->rdev
;
1893 if (regulator
->always_on
)
1897 ret
= regulator_enable(rdev
->supply
);
1902 mutex_lock(&rdev
->mutex
);
1903 ret
= _regulator_enable(rdev
);
1904 mutex_unlock(&rdev
->mutex
);
1906 if (ret
!= 0 && rdev
->supply
)
1907 regulator_disable(rdev
->supply
);
1911 EXPORT_SYMBOL_GPL(regulator_enable
);
1913 static int _regulator_do_disable(struct regulator_dev
*rdev
)
1917 trace_regulator_disable(rdev_get_name(rdev
));
1919 if (rdev
->ena_pin
) {
1920 ret
= regulator_ena_gpio_ctrl(rdev
, false);
1923 rdev
->ena_gpio_state
= 0;
1925 } else if (rdev
->desc
->ops
->disable
) {
1926 ret
= rdev
->desc
->ops
->disable(rdev
);
1931 /* cares about last_off_jiffy only if off_on_delay is required by
1934 if (rdev
->desc
->off_on_delay
)
1935 rdev
->last_off_jiffy
= jiffies
;
1937 trace_regulator_disable_complete(rdev_get_name(rdev
));
1942 /* locks held by regulator_disable() */
1943 static int _regulator_disable(struct regulator_dev
*rdev
)
1947 if (WARN(rdev
->use_count
<= 0,
1948 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1951 /* are we the last user and permitted to disable ? */
1952 if (rdev
->use_count
== 1 &&
1953 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1955 /* we are last user */
1956 if (_regulator_can_change_status(rdev
)) {
1957 ret
= _notifier_call_chain(rdev
,
1958 REGULATOR_EVENT_PRE_DISABLE
,
1960 if (ret
& NOTIFY_STOP_MASK
)
1963 ret
= _regulator_do_disable(rdev
);
1965 rdev_err(rdev
, "failed to disable\n");
1966 _notifier_call_chain(rdev
,
1967 REGULATOR_EVENT_ABORT_DISABLE
,
1971 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1975 rdev
->use_count
= 0;
1976 } else if (rdev
->use_count
> 1) {
1978 if (rdev
->constraints
&&
1979 (rdev
->constraints
->valid_ops_mask
&
1980 REGULATOR_CHANGE_DRMS
))
1981 drms_uA_update(rdev
);
1990 * regulator_disable - disable regulator output
1991 * @regulator: regulator source
1993 * Disable the regulator output voltage or current. Calls to
1994 * regulator_enable() must be balanced with calls to
1995 * regulator_disable().
1997 * NOTE: this will only disable the regulator output if no other consumer
1998 * devices have it enabled, the regulator device supports disabling and
1999 * machine constraints permit this operation.
2001 int regulator_disable(struct regulator
*regulator
)
2003 struct regulator_dev
*rdev
= regulator
->rdev
;
2006 if (regulator
->always_on
)
2009 mutex_lock(&rdev
->mutex
);
2010 ret
= _regulator_disable(rdev
);
2011 mutex_unlock(&rdev
->mutex
);
2013 if (ret
== 0 && rdev
->supply
)
2014 regulator_disable(rdev
->supply
);
2018 EXPORT_SYMBOL_GPL(regulator_disable
);
2020 /* locks held by regulator_force_disable() */
2021 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2025 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2026 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2027 if (ret
& NOTIFY_STOP_MASK
)
2030 ret
= _regulator_do_disable(rdev
);
2032 rdev_err(rdev
, "failed to force disable\n");
2033 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2034 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2038 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2039 REGULATOR_EVENT_DISABLE
, NULL
);
2045 * regulator_force_disable - force disable regulator output
2046 * @regulator: regulator source
2048 * Forcibly disable the regulator output voltage or current.
2049 * NOTE: this *will* disable the regulator output even if other consumer
2050 * devices have it enabled. This should be used for situations when device
2051 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2053 int regulator_force_disable(struct regulator
*regulator
)
2055 struct regulator_dev
*rdev
= regulator
->rdev
;
2058 mutex_lock(&rdev
->mutex
);
2059 regulator
->uA_load
= 0;
2060 ret
= _regulator_force_disable(regulator
->rdev
);
2061 mutex_unlock(&rdev
->mutex
);
2064 while (rdev
->open_count
--)
2065 regulator_disable(rdev
->supply
);
2069 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2071 static void regulator_disable_work(struct work_struct
*work
)
2073 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2077 mutex_lock(&rdev
->mutex
);
2079 BUG_ON(!rdev
->deferred_disables
);
2081 count
= rdev
->deferred_disables
;
2082 rdev
->deferred_disables
= 0;
2084 for (i
= 0; i
< count
; i
++) {
2085 ret
= _regulator_disable(rdev
);
2087 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2090 mutex_unlock(&rdev
->mutex
);
2093 for (i
= 0; i
< count
; i
++) {
2094 ret
= regulator_disable(rdev
->supply
);
2097 "Supply disable failed: %d\n", ret
);
2104 * regulator_disable_deferred - disable regulator output with delay
2105 * @regulator: regulator source
2106 * @ms: miliseconds until the regulator is disabled
2108 * Execute regulator_disable() on the regulator after a delay. This
2109 * is intended for use with devices that require some time to quiesce.
2111 * NOTE: this will only disable the regulator output if no other consumer
2112 * devices have it enabled, the regulator device supports disabling and
2113 * machine constraints permit this operation.
2115 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2117 struct regulator_dev
*rdev
= regulator
->rdev
;
2120 if (regulator
->always_on
)
2124 return regulator_disable(regulator
);
2126 mutex_lock(&rdev
->mutex
);
2127 rdev
->deferred_disables
++;
2128 mutex_unlock(&rdev
->mutex
);
2130 ret
= queue_delayed_work(system_power_efficient_wq
,
2131 &rdev
->disable_work
,
2132 msecs_to_jiffies(ms
));
2138 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2140 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2142 /* A GPIO control always takes precedence */
2144 return rdev
->ena_gpio_state
;
2146 /* If we don't know then assume that the regulator is always on */
2147 if (!rdev
->desc
->ops
->is_enabled
)
2150 return rdev
->desc
->ops
->is_enabled(rdev
);
2154 * regulator_is_enabled - is the regulator output enabled
2155 * @regulator: regulator source
2157 * Returns positive if the regulator driver backing the source/client
2158 * has requested that the device be enabled, zero if it hasn't, else a
2159 * negative errno code.
2161 * Note that the device backing this regulator handle can have multiple
2162 * users, so it might be enabled even if regulator_enable() was never
2163 * called for this particular source.
2165 int regulator_is_enabled(struct regulator
*regulator
)
2169 if (regulator
->always_on
)
2172 mutex_lock(®ulator
->rdev
->mutex
);
2173 ret
= _regulator_is_enabled(regulator
->rdev
);
2174 mutex_unlock(®ulator
->rdev
->mutex
);
2178 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2181 * regulator_can_change_voltage - check if regulator can change voltage
2182 * @regulator: regulator source
2184 * Returns positive if the regulator driver backing the source/client
2185 * can change its voltage, false otherwise. Useful for detecting fixed
2186 * or dummy regulators and disabling voltage change logic in the client
2189 int regulator_can_change_voltage(struct regulator
*regulator
)
2191 struct regulator_dev
*rdev
= regulator
->rdev
;
2193 if (rdev
->constraints
&&
2194 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2195 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2198 if (rdev
->desc
->continuous_voltage_range
&&
2199 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2200 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2206 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2209 * regulator_count_voltages - count regulator_list_voltage() selectors
2210 * @regulator: regulator source
2212 * Returns number of selectors, or negative errno. Selectors are
2213 * numbered starting at zero, and typically correspond to bitfields
2214 * in hardware registers.
2216 int regulator_count_voltages(struct regulator
*regulator
)
2218 struct regulator_dev
*rdev
= regulator
->rdev
;
2220 if (rdev
->desc
->n_voltages
)
2221 return rdev
->desc
->n_voltages
;
2226 return regulator_count_voltages(rdev
->supply
);
2228 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2231 * regulator_list_voltage - enumerate supported voltages
2232 * @regulator: regulator source
2233 * @selector: identify voltage to list
2234 * Context: can sleep
2236 * Returns a voltage that can be passed to @regulator_set_voltage(),
2237 * zero if this selector code can't be used on this system, or a
2240 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2242 struct regulator_dev
*rdev
= regulator
->rdev
;
2243 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2246 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2247 return rdev
->desc
->fixed_uV
;
2249 if (ops
->list_voltage
) {
2250 if (selector
>= rdev
->desc
->n_voltages
)
2252 mutex_lock(&rdev
->mutex
);
2253 ret
= ops
->list_voltage(rdev
, selector
);
2254 mutex_unlock(&rdev
->mutex
);
2255 } else if (rdev
->supply
) {
2256 ret
= regulator_list_voltage(rdev
->supply
, selector
);
2262 if (ret
< rdev
->constraints
->min_uV
)
2264 else if (ret
> rdev
->constraints
->max_uV
)
2270 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2273 * regulator_get_regmap - get the regulator's register map
2274 * @regulator: regulator source
2276 * Returns the register map for the given regulator, or an ERR_PTR value
2277 * if the regulator doesn't use regmap.
2279 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
2281 struct regmap
*map
= regulator
->rdev
->regmap
;
2283 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
2287 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2288 * @regulator: regulator source
2289 * @vsel_reg: voltage selector register, output parameter
2290 * @vsel_mask: mask for voltage selector bitfield, output parameter
2292 * Returns the hardware register offset and bitmask used for setting the
2293 * regulator voltage. This might be useful when configuring voltage-scaling
2294 * hardware or firmware that can make I2C requests behind the kernel's back,
2297 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2298 * and 0 is returned, otherwise a negative errno is returned.
2300 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
2302 unsigned *vsel_mask
)
2304 struct regulator_dev
*rdev
= regulator
->rdev
;
2305 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2307 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2310 *vsel_reg
= rdev
->desc
->vsel_reg
;
2311 *vsel_mask
= rdev
->desc
->vsel_mask
;
2315 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
2318 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2319 * @regulator: regulator source
2320 * @selector: identify voltage to list
2322 * Converts the selector to a hardware-specific voltage selector that can be
2323 * directly written to the regulator registers. The address of the voltage
2324 * register can be determined by calling @regulator_get_hardware_vsel_register.
2326 * On error a negative errno is returned.
2328 int regulator_list_hardware_vsel(struct regulator
*regulator
,
2331 struct regulator_dev
*rdev
= regulator
->rdev
;
2332 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2334 if (selector
>= rdev
->desc
->n_voltages
)
2336 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2341 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
2344 * regulator_get_linear_step - return the voltage step size between VSEL values
2345 * @regulator: regulator source
2347 * Returns the voltage step size between VSEL values for linear
2348 * regulators, or return 0 if the regulator isn't a linear regulator.
2350 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2352 struct regulator_dev
*rdev
= regulator
->rdev
;
2354 return rdev
->desc
->uV_step
;
2356 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2359 * regulator_is_supported_voltage - check if a voltage range can be supported
2361 * @regulator: Regulator to check.
2362 * @min_uV: Minimum required voltage in uV.
2363 * @max_uV: Maximum required voltage in uV.
2365 * Returns a boolean or a negative error code.
2367 int regulator_is_supported_voltage(struct regulator
*regulator
,
2368 int min_uV
, int max_uV
)
2370 struct regulator_dev
*rdev
= regulator
->rdev
;
2371 int i
, voltages
, ret
;
2373 /* If we can't change voltage check the current voltage */
2374 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2375 ret
= regulator_get_voltage(regulator
);
2377 return min_uV
<= ret
&& ret
<= max_uV
;
2382 /* Any voltage within constrains range is fine? */
2383 if (rdev
->desc
->continuous_voltage_range
)
2384 return min_uV
>= rdev
->constraints
->min_uV
&&
2385 max_uV
<= rdev
->constraints
->max_uV
;
2387 ret
= regulator_count_voltages(regulator
);
2392 for (i
= 0; i
< voltages
; i
++) {
2393 ret
= regulator_list_voltage(regulator
, i
);
2395 if (ret
>= min_uV
&& ret
<= max_uV
)
2401 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2403 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
2404 int min_uV
, int max_uV
,
2407 struct pre_voltage_change_data data
;
2410 data
.old_uV
= _regulator_get_voltage(rdev
);
2411 data
.min_uV
= min_uV
;
2412 data
.max_uV
= max_uV
;
2413 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2415 if (ret
& NOTIFY_STOP_MASK
)
2418 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
2422 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2423 (void *)data
.old_uV
);
2428 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
2429 int uV
, unsigned selector
)
2431 struct pre_voltage_change_data data
;
2434 data
.old_uV
= _regulator_get_voltage(rdev
);
2437 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2439 if (ret
& NOTIFY_STOP_MASK
)
2442 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
2446 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2447 (void *)data
.old_uV
);
2452 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2453 int min_uV
, int max_uV
)
2458 unsigned int selector
;
2459 int old_selector
= -1;
2461 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2463 min_uV
+= rdev
->constraints
->uV_offset
;
2464 max_uV
+= rdev
->constraints
->uV_offset
;
2467 * If we can't obtain the old selector there is not enough
2468 * info to call set_voltage_time_sel().
2470 if (_regulator_is_enabled(rdev
) &&
2471 rdev
->desc
->ops
->set_voltage_time_sel
&&
2472 rdev
->desc
->ops
->get_voltage_sel
) {
2473 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2474 if (old_selector
< 0)
2475 return old_selector
;
2478 if (rdev
->desc
->ops
->set_voltage
) {
2479 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
2483 if (rdev
->desc
->ops
->list_voltage
)
2484 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2487 best_val
= _regulator_get_voltage(rdev
);
2490 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2491 if (rdev
->desc
->ops
->map_voltage
) {
2492 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2495 if (rdev
->desc
->ops
->list_voltage
==
2496 regulator_list_voltage_linear
)
2497 ret
= regulator_map_voltage_linear(rdev
,
2499 else if (rdev
->desc
->ops
->list_voltage
==
2500 regulator_list_voltage_linear_range
)
2501 ret
= regulator_map_voltage_linear_range(rdev
,
2504 ret
= regulator_map_voltage_iterate(rdev
,
2509 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2510 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2512 if (old_selector
== selector
)
2515 ret
= _regulator_call_set_voltage_sel(
2516 rdev
, best_val
, selector
);
2525 /* Call set_voltage_time_sel if successfully obtained old_selector */
2526 if (ret
== 0 && !rdev
->constraints
->ramp_disable
&& old_selector
>= 0
2527 && old_selector
!= selector
) {
2529 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2530 old_selector
, selector
);
2532 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2537 /* Insert any necessary delays */
2538 if (delay
>= 1000) {
2539 mdelay(delay
/ 1000);
2540 udelay(delay
% 1000);
2546 if (ret
== 0 && best_val
>= 0) {
2547 unsigned long data
= best_val
;
2549 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2553 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2559 * regulator_set_voltage - set regulator output voltage
2560 * @regulator: regulator source
2561 * @min_uV: Minimum required voltage in uV
2562 * @max_uV: Maximum acceptable voltage in uV
2564 * Sets a voltage regulator to the desired output voltage. This can be set
2565 * during any regulator state. IOW, regulator can be disabled or enabled.
2567 * If the regulator is enabled then the voltage will change to the new value
2568 * immediately otherwise if the regulator is disabled the regulator will
2569 * output at the new voltage when enabled.
2571 * NOTE: If the regulator is shared between several devices then the lowest
2572 * request voltage that meets the system constraints will be used.
2573 * Regulator system constraints must be set for this regulator before
2574 * calling this function otherwise this call will fail.
2576 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2578 struct regulator_dev
*rdev
= regulator
->rdev
;
2580 int old_min_uV
, old_max_uV
;
2583 mutex_lock(&rdev
->mutex
);
2585 /* If we're setting the same range as last time the change
2586 * should be a noop (some cpufreq implementations use the same
2587 * voltage for multiple frequencies, for example).
2589 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2592 /* If we're trying to set a range that overlaps the current voltage,
2593 * return succesfully even though the regulator does not support
2594 * changing the voltage.
2596 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2597 current_uV
= _regulator_get_voltage(rdev
);
2598 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
2599 regulator
->min_uV
= min_uV
;
2600 regulator
->max_uV
= max_uV
;
2606 if (!rdev
->desc
->ops
->set_voltage
&&
2607 !rdev
->desc
->ops
->set_voltage_sel
) {
2612 /* constraints check */
2613 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2617 /* restore original values in case of error */
2618 old_min_uV
= regulator
->min_uV
;
2619 old_max_uV
= regulator
->max_uV
;
2620 regulator
->min_uV
= min_uV
;
2621 regulator
->max_uV
= max_uV
;
2623 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2627 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2632 mutex_unlock(&rdev
->mutex
);
2635 regulator
->min_uV
= old_min_uV
;
2636 regulator
->max_uV
= old_max_uV
;
2637 mutex_unlock(&rdev
->mutex
);
2640 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2643 * regulator_set_voltage_time - get raise/fall time
2644 * @regulator: regulator source
2645 * @old_uV: starting voltage in microvolts
2646 * @new_uV: target voltage in microvolts
2648 * Provided with the starting and ending voltage, this function attempts to
2649 * calculate the time in microseconds required to rise or fall to this new
2652 int regulator_set_voltage_time(struct regulator
*regulator
,
2653 int old_uV
, int new_uV
)
2655 struct regulator_dev
*rdev
= regulator
->rdev
;
2656 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2662 /* Currently requires operations to do this */
2663 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2664 || !rdev
->desc
->n_voltages
)
2667 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2668 /* We only look for exact voltage matches here */
2669 voltage
= regulator_list_voltage(regulator
, i
);
2674 if (voltage
== old_uV
)
2676 if (voltage
== new_uV
)
2680 if (old_sel
< 0 || new_sel
< 0)
2683 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2685 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2688 * regulator_set_voltage_time_sel - get raise/fall time
2689 * @rdev: regulator source device
2690 * @old_selector: selector for starting voltage
2691 * @new_selector: selector for target voltage
2693 * Provided with the starting and target voltage selectors, this function
2694 * returns time in microseconds required to rise or fall to this new voltage
2696 * Drivers providing ramp_delay in regulation_constraints can use this as their
2697 * set_voltage_time_sel() operation.
2699 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2700 unsigned int old_selector
,
2701 unsigned int new_selector
)
2703 unsigned int ramp_delay
= 0;
2704 int old_volt
, new_volt
;
2706 if (rdev
->constraints
->ramp_delay
)
2707 ramp_delay
= rdev
->constraints
->ramp_delay
;
2708 else if (rdev
->desc
->ramp_delay
)
2709 ramp_delay
= rdev
->desc
->ramp_delay
;
2711 if (ramp_delay
== 0) {
2712 rdev_warn(rdev
, "ramp_delay not set\n");
2717 if (!rdev
->desc
->ops
->list_voltage
)
2720 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2721 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2723 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2725 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2728 * regulator_sync_voltage - re-apply last regulator output voltage
2729 * @regulator: regulator source
2731 * Re-apply the last configured voltage. This is intended to be used
2732 * where some external control source the consumer is cooperating with
2733 * has caused the configured voltage to change.
2735 int regulator_sync_voltage(struct regulator
*regulator
)
2737 struct regulator_dev
*rdev
= regulator
->rdev
;
2738 int ret
, min_uV
, max_uV
;
2740 mutex_lock(&rdev
->mutex
);
2742 if (!rdev
->desc
->ops
->set_voltage
&&
2743 !rdev
->desc
->ops
->set_voltage_sel
) {
2748 /* This is only going to work if we've had a voltage configured. */
2749 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2754 min_uV
= regulator
->min_uV
;
2755 max_uV
= regulator
->max_uV
;
2757 /* This should be a paranoia check... */
2758 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2762 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2766 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2769 mutex_unlock(&rdev
->mutex
);
2772 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2774 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2778 if (rdev
->desc
->ops
->get_voltage_sel
) {
2779 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2782 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2783 } else if (rdev
->desc
->ops
->get_voltage
) {
2784 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2785 } else if (rdev
->desc
->ops
->list_voltage
) {
2786 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2787 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
2788 ret
= rdev
->desc
->fixed_uV
;
2789 } else if (rdev
->supply
) {
2790 ret
= regulator_get_voltage(rdev
->supply
);
2797 return ret
- rdev
->constraints
->uV_offset
;
2801 * regulator_get_voltage - get regulator output voltage
2802 * @regulator: regulator source
2804 * This returns the current regulator voltage in uV.
2806 * NOTE: If the regulator is disabled it will return the voltage value. This
2807 * function should not be used to determine regulator state.
2809 int regulator_get_voltage(struct regulator
*regulator
)
2813 mutex_lock(®ulator
->rdev
->mutex
);
2815 ret
= _regulator_get_voltage(regulator
->rdev
);
2817 mutex_unlock(®ulator
->rdev
->mutex
);
2821 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2824 * regulator_set_current_limit - set regulator output current limit
2825 * @regulator: regulator source
2826 * @min_uA: Minimum supported current in uA
2827 * @max_uA: Maximum supported current in uA
2829 * Sets current sink to the desired output current. This can be set during
2830 * any regulator state. IOW, regulator can be disabled or enabled.
2832 * If the regulator is enabled then the current will change to the new value
2833 * immediately otherwise if the regulator is disabled the regulator will
2834 * output at the new current when enabled.
2836 * NOTE: Regulator system constraints must be set for this regulator before
2837 * calling this function otherwise this call will fail.
2839 int regulator_set_current_limit(struct regulator
*regulator
,
2840 int min_uA
, int max_uA
)
2842 struct regulator_dev
*rdev
= regulator
->rdev
;
2845 mutex_lock(&rdev
->mutex
);
2848 if (!rdev
->desc
->ops
->set_current_limit
) {
2853 /* constraints check */
2854 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2858 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2860 mutex_unlock(&rdev
->mutex
);
2863 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2865 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2869 mutex_lock(&rdev
->mutex
);
2872 if (!rdev
->desc
->ops
->get_current_limit
) {
2877 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2879 mutex_unlock(&rdev
->mutex
);
2884 * regulator_get_current_limit - get regulator output current
2885 * @regulator: regulator source
2887 * This returns the current supplied by the specified current sink in uA.
2889 * NOTE: If the regulator is disabled it will return the current value. This
2890 * function should not be used to determine regulator state.
2892 int regulator_get_current_limit(struct regulator
*regulator
)
2894 return _regulator_get_current_limit(regulator
->rdev
);
2896 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2899 * regulator_set_mode - set regulator operating mode
2900 * @regulator: regulator source
2901 * @mode: operating mode - one of the REGULATOR_MODE constants
2903 * Set regulator operating mode to increase regulator efficiency or improve
2904 * regulation performance.
2906 * NOTE: Regulator system constraints must be set for this regulator before
2907 * calling this function otherwise this call will fail.
2909 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2911 struct regulator_dev
*rdev
= regulator
->rdev
;
2913 int regulator_curr_mode
;
2915 mutex_lock(&rdev
->mutex
);
2918 if (!rdev
->desc
->ops
->set_mode
) {
2923 /* return if the same mode is requested */
2924 if (rdev
->desc
->ops
->get_mode
) {
2925 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2926 if (regulator_curr_mode
== mode
) {
2932 /* constraints check */
2933 ret
= regulator_mode_constrain(rdev
, &mode
);
2937 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2939 mutex_unlock(&rdev
->mutex
);
2942 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2944 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2948 mutex_lock(&rdev
->mutex
);
2951 if (!rdev
->desc
->ops
->get_mode
) {
2956 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2958 mutex_unlock(&rdev
->mutex
);
2963 * regulator_get_mode - get regulator operating mode
2964 * @regulator: regulator source
2966 * Get the current regulator operating mode.
2968 unsigned int regulator_get_mode(struct regulator
*regulator
)
2970 return _regulator_get_mode(regulator
->rdev
);
2972 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2975 * regulator_set_optimum_mode - set regulator optimum operating mode
2976 * @regulator: regulator source
2977 * @uA_load: load current
2979 * Notifies the regulator core of a new device load. This is then used by
2980 * DRMS (if enabled by constraints) to set the most efficient regulator
2981 * operating mode for the new regulator loading.
2983 * Consumer devices notify their supply regulator of the maximum power
2984 * they will require (can be taken from device datasheet in the power
2985 * consumption tables) when they change operational status and hence power
2986 * state. Examples of operational state changes that can affect power
2987 * consumption are :-
2989 * o Device is opened / closed.
2990 * o Device I/O is about to begin or has just finished.
2991 * o Device is idling in between work.
2993 * This information is also exported via sysfs to userspace.
2995 * DRMS will sum the total requested load on the regulator and change
2996 * to the most efficient operating mode if platform constraints allow.
2998 * Returns the new regulator mode or error.
3000 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
3002 struct regulator_dev
*rdev
= regulator
->rdev
;
3003 struct regulator
*consumer
;
3004 int ret
, output_uV
, input_uV
= 0, total_uA_load
= 0;
3008 input_uV
= regulator_get_voltage(rdev
->supply
);
3010 mutex_lock(&rdev
->mutex
);
3013 * first check to see if we can set modes at all, otherwise just
3014 * tell the consumer everything is OK.
3016 regulator
->uA_load
= uA_load
;
3017 ret
= regulator_check_drms(rdev
);
3023 if (!rdev
->desc
->ops
->get_optimum_mode
)
3027 * we can actually do this so any errors are indicators of
3028 * potential real failure.
3032 if (!rdev
->desc
->ops
->set_mode
)
3035 /* get output voltage */
3036 output_uV
= _regulator_get_voltage(rdev
);
3037 if (output_uV
<= 0) {
3038 rdev_err(rdev
, "invalid output voltage found\n");
3042 /* No supply? Use constraint voltage */
3044 input_uV
= rdev
->constraints
->input_uV
;
3045 if (input_uV
<= 0) {
3046 rdev_err(rdev
, "invalid input voltage found\n");
3050 /* calc total requested load for this regulator */
3051 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
3052 total_uA_load
+= consumer
->uA_load
;
3054 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
3055 input_uV
, output_uV
,
3057 ret
= regulator_mode_constrain(rdev
, &mode
);
3059 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
3060 total_uA_load
, input_uV
, output_uV
);
3064 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
3066 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
3071 mutex_unlock(&rdev
->mutex
);
3074 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
3077 * regulator_allow_bypass - allow the regulator to go into bypass mode
3079 * @regulator: Regulator to configure
3080 * @enable: enable or disable bypass mode
3082 * Allow the regulator to go into bypass mode if all other consumers
3083 * for the regulator also enable bypass mode and the machine
3084 * constraints allow this. Bypass mode means that the regulator is
3085 * simply passing the input directly to the output with no regulation.
3087 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3089 struct regulator_dev
*rdev
= regulator
->rdev
;
3092 if (!rdev
->desc
->ops
->set_bypass
)
3095 if (rdev
->constraints
&&
3096 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
3099 mutex_lock(&rdev
->mutex
);
3101 if (enable
&& !regulator
->bypass
) {
3102 rdev
->bypass_count
++;
3104 if (rdev
->bypass_count
== rdev
->open_count
) {
3105 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3107 rdev
->bypass_count
--;
3110 } else if (!enable
&& regulator
->bypass
) {
3111 rdev
->bypass_count
--;
3113 if (rdev
->bypass_count
!= rdev
->open_count
) {
3114 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3116 rdev
->bypass_count
++;
3121 regulator
->bypass
= enable
;
3123 mutex_unlock(&rdev
->mutex
);
3127 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3130 * regulator_register_notifier - register regulator event notifier
3131 * @regulator: regulator source
3132 * @nb: notifier block
3134 * Register notifier block to receive regulator events.
3136 int regulator_register_notifier(struct regulator
*regulator
,
3137 struct notifier_block
*nb
)
3139 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3142 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3145 * regulator_unregister_notifier - unregister regulator event notifier
3146 * @regulator: regulator source
3147 * @nb: notifier block
3149 * Unregister regulator event notifier block.
3151 int regulator_unregister_notifier(struct regulator
*regulator
,
3152 struct notifier_block
*nb
)
3154 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3157 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3159 /* notify regulator consumers and downstream regulator consumers.
3160 * Note mutex must be held by caller.
3162 static int _notifier_call_chain(struct regulator_dev
*rdev
,
3163 unsigned long event
, void *data
)
3165 /* call rdev chain first */
3166 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3170 * regulator_bulk_get - get multiple regulator consumers
3172 * @dev: Device to supply
3173 * @num_consumers: Number of consumers to register
3174 * @consumers: Configuration of consumers; clients are stored here.
3176 * @return 0 on success, an errno on failure.
3178 * This helper function allows drivers to get several regulator
3179 * consumers in one operation. If any of the regulators cannot be
3180 * acquired then any regulators that were allocated will be freed
3181 * before returning to the caller.
3183 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3184 struct regulator_bulk_data
*consumers
)
3189 for (i
= 0; i
< num_consumers
; i
++)
3190 consumers
[i
].consumer
= NULL
;
3192 for (i
= 0; i
< num_consumers
; i
++) {
3193 consumers
[i
].consumer
= regulator_get(dev
,
3194 consumers
[i
].supply
);
3195 if (IS_ERR(consumers
[i
].consumer
)) {
3196 ret
= PTR_ERR(consumers
[i
].consumer
);
3197 dev_err(dev
, "Failed to get supply '%s': %d\n",
3198 consumers
[i
].supply
, ret
);
3199 consumers
[i
].consumer
= NULL
;
3208 regulator_put(consumers
[i
].consumer
);
3212 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3214 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3216 struct regulator_bulk_data
*bulk
= data
;
3218 bulk
->ret
= regulator_enable(bulk
->consumer
);
3222 * regulator_bulk_enable - enable multiple regulator consumers
3224 * @num_consumers: Number of consumers
3225 * @consumers: Consumer data; clients are stored here.
3226 * @return 0 on success, an errno on failure
3228 * This convenience API allows consumers to enable multiple regulator
3229 * clients in a single API call. If any consumers cannot be enabled
3230 * then any others that were enabled will be disabled again prior to
3233 int regulator_bulk_enable(int num_consumers
,
3234 struct regulator_bulk_data
*consumers
)
3236 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3240 for (i
= 0; i
< num_consumers
; i
++) {
3241 if (consumers
[i
].consumer
->always_on
)
3242 consumers
[i
].ret
= 0;
3244 async_schedule_domain(regulator_bulk_enable_async
,
3245 &consumers
[i
], &async_domain
);
3248 async_synchronize_full_domain(&async_domain
);
3250 /* If any consumer failed we need to unwind any that succeeded */
3251 for (i
= 0; i
< num_consumers
; i
++) {
3252 if (consumers
[i
].ret
!= 0) {
3253 ret
= consumers
[i
].ret
;
3261 for (i
= 0; i
< num_consumers
; i
++) {
3262 if (consumers
[i
].ret
< 0)
3263 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3266 regulator_disable(consumers
[i
].consumer
);
3271 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3274 * regulator_bulk_disable - disable multiple regulator consumers
3276 * @num_consumers: Number of consumers
3277 * @consumers: Consumer data; clients are stored here.
3278 * @return 0 on success, an errno on failure
3280 * This convenience API allows consumers to disable multiple regulator
3281 * clients in a single API call. If any consumers cannot be disabled
3282 * then any others that were disabled will be enabled again prior to
3285 int regulator_bulk_disable(int num_consumers
,
3286 struct regulator_bulk_data
*consumers
)
3291 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3292 ret
= regulator_disable(consumers
[i
].consumer
);
3300 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3301 for (++i
; i
< num_consumers
; ++i
) {
3302 r
= regulator_enable(consumers
[i
].consumer
);
3304 pr_err("Failed to reename %s: %d\n",
3305 consumers
[i
].supply
, r
);
3310 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3313 * regulator_bulk_force_disable - force disable multiple regulator consumers
3315 * @num_consumers: Number of consumers
3316 * @consumers: Consumer data; clients are stored here.
3317 * @return 0 on success, an errno on failure
3319 * This convenience API allows consumers to forcibly disable multiple regulator
3320 * clients in a single API call.
3321 * NOTE: This should be used for situations when device damage will
3322 * likely occur if the regulators are not disabled (e.g. over temp).
3323 * Although regulator_force_disable function call for some consumers can
3324 * return error numbers, the function is called for all consumers.
3326 int regulator_bulk_force_disable(int num_consumers
,
3327 struct regulator_bulk_data
*consumers
)
3332 for (i
= 0; i
< num_consumers
; i
++)
3334 regulator_force_disable(consumers
[i
].consumer
);
3336 for (i
= 0; i
< num_consumers
; i
++) {
3337 if (consumers
[i
].ret
!= 0) {
3338 ret
= consumers
[i
].ret
;
3347 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3350 * regulator_bulk_free - free multiple regulator consumers
3352 * @num_consumers: Number of consumers
3353 * @consumers: Consumer data; clients are stored here.
3355 * This convenience API allows consumers to free multiple regulator
3356 * clients in a single API call.
3358 void regulator_bulk_free(int num_consumers
,
3359 struct regulator_bulk_data
*consumers
)
3363 for (i
= 0; i
< num_consumers
; i
++) {
3364 regulator_put(consumers
[i
].consumer
);
3365 consumers
[i
].consumer
= NULL
;
3368 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3371 * regulator_notifier_call_chain - call regulator event notifier
3372 * @rdev: regulator source
3373 * @event: notifier block
3374 * @data: callback-specific data.
3376 * Called by regulator drivers to notify clients a regulator event has
3377 * occurred. We also notify regulator clients downstream.
3378 * Note lock must be held by caller.
3380 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3381 unsigned long event
, void *data
)
3383 _notifier_call_chain(rdev
, event
, data
);
3387 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3390 * regulator_mode_to_status - convert a regulator mode into a status
3392 * @mode: Mode to convert
3394 * Convert a regulator mode into a status.
3396 int regulator_mode_to_status(unsigned int mode
)
3399 case REGULATOR_MODE_FAST
:
3400 return REGULATOR_STATUS_FAST
;
3401 case REGULATOR_MODE_NORMAL
:
3402 return REGULATOR_STATUS_NORMAL
;
3403 case REGULATOR_MODE_IDLE
:
3404 return REGULATOR_STATUS_IDLE
;
3405 case REGULATOR_MODE_STANDBY
:
3406 return REGULATOR_STATUS_STANDBY
;
3408 return REGULATOR_STATUS_UNDEFINED
;
3411 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3413 static struct attribute
*regulator_dev_attrs
[] = {
3414 &dev_attr_name
.attr
,
3415 &dev_attr_num_users
.attr
,
3416 &dev_attr_type
.attr
,
3417 &dev_attr_microvolts
.attr
,
3418 &dev_attr_microamps
.attr
,
3419 &dev_attr_opmode
.attr
,
3420 &dev_attr_state
.attr
,
3421 &dev_attr_status
.attr
,
3422 &dev_attr_bypass
.attr
,
3423 &dev_attr_requested_microamps
.attr
,
3424 &dev_attr_min_microvolts
.attr
,
3425 &dev_attr_max_microvolts
.attr
,
3426 &dev_attr_min_microamps
.attr
,
3427 &dev_attr_max_microamps
.attr
,
3428 &dev_attr_suspend_standby_state
.attr
,
3429 &dev_attr_suspend_mem_state
.attr
,
3430 &dev_attr_suspend_disk_state
.attr
,
3431 &dev_attr_suspend_standby_microvolts
.attr
,
3432 &dev_attr_suspend_mem_microvolts
.attr
,
3433 &dev_attr_suspend_disk_microvolts
.attr
,
3434 &dev_attr_suspend_standby_mode
.attr
,
3435 &dev_attr_suspend_mem_mode
.attr
,
3436 &dev_attr_suspend_disk_mode
.attr
,
3441 * To avoid cluttering sysfs (and memory) with useless state, only
3442 * create attributes that can be meaningfully displayed.
3444 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
3445 struct attribute
*attr
, int idx
)
3447 struct device
*dev
= kobj_to_dev(kobj
);
3448 struct regulator_dev
*rdev
= container_of(dev
, struct regulator_dev
, dev
);
3449 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3450 umode_t mode
= attr
->mode
;
3452 /* these three are always present */
3453 if (attr
== &dev_attr_name
.attr
||
3454 attr
== &dev_attr_num_users
.attr
||
3455 attr
== &dev_attr_type
.attr
)
3458 /* some attributes need specific methods to be displayed */
3459 if (attr
== &dev_attr_microvolts
.attr
) {
3460 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3461 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3462 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3463 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
3468 if (attr
== &dev_attr_microamps
.attr
)
3469 return ops
->get_current_limit
? mode
: 0;
3471 if (attr
== &dev_attr_opmode
.attr
)
3472 return ops
->get_mode
? mode
: 0;
3474 if (attr
== &dev_attr_state
.attr
)
3475 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
3477 if (attr
== &dev_attr_status
.attr
)
3478 return ops
->get_status
? mode
: 0;
3480 if (attr
== &dev_attr_bypass
.attr
)
3481 return ops
->get_bypass
? mode
: 0;
3483 /* some attributes are type-specific */
3484 if (attr
== &dev_attr_requested_microamps
.attr
)
3485 return rdev
->desc
->type
== REGULATOR_CURRENT
? mode
: 0;
3487 /* all the other attributes exist to support constraints;
3488 * don't show them if there are no constraints, or if the
3489 * relevant supporting methods are missing.
3491 if (!rdev
->constraints
)
3494 /* constraints need specific supporting methods */
3495 if (attr
== &dev_attr_min_microvolts
.attr
||
3496 attr
== &dev_attr_max_microvolts
.attr
)
3497 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
3499 if (attr
== &dev_attr_min_microamps
.attr
||
3500 attr
== &dev_attr_max_microamps
.attr
)
3501 return ops
->set_current_limit
? mode
: 0;
3503 if (attr
== &dev_attr_suspend_standby_state
.attr
||
3504 attr
== &dev_attr_suspend_mem_state
.attr
||
3505 attr
== &dev_attr_suspend_disk_state
.attr
)
3508 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
3509 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
3510 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
3511 return ops
->set_suspend_voltage
? mode
: 0;
3513 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
3514 attr
== &dev_attr_suspend_mem_mode
.attr
||
3515 attr
== &dev_attr_suspend_disk_mode
.attr
)
3516 return ops
->set_suspend_mode
? mode
: 0;
3521 static const struct attribute_group regulator_dev_group
= {
3522 .attrs
= regulator_dev_attrs
,
3523 .is_visible
= regulator_attr_is_visible
,
3526 static const struct attribute_group
*regulator_dev_groups
[] = {
3527 ®ulator_dev_group
,
3531 static void regulator_dev_release(struct device
*dev
)
3533 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
3537 static struct class regulator_class
= {
3538 .name
= "regulator",
3539 .dev_release
= regulator_dev_release
,
3540 .dev_groups
= regulator_dev_groups
,
3543 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3545 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3546 if (!rdev
->debugfs
) {
3547 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3551 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3553 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3555 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3556 &rdev
->bypass_count
);
3560 * regulator_register - register regulator
3561 * @regulator_desc: regulator to register
3562 * @config: runtime configuration for regulator
3564 * Called by regulator drivers to register a regulator.
3565 * Returns a valid pointer to struct regulator_dev on success
3566 * or an ERR_PTR() on error.
3568 struct regulator_dev
*
3569 regulator_register(const struct regulator_desc
*regulator_desc
,
3570 const struct regulator_config
*config
)
3572 const struct regulation_constraints
*constraints
= NULL
;
3573 const struct regulator_init_data
*init_data
;
3574 static atomic_t regulator_no
= ATOMIC_INIT(-1);
3575 struct regulator_dev
*rdev
;
3578 const char *supply
= NULL
;
3580 if (regulator_desc
== NULL
|| config
== NULL
)
3581 return ERR_PTR(-EINVAL
);
3586 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3587 return ERR_PTR(-EINVAL
);
3589 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3590 regulator_desc
->type
!= REGULATOR_CURRENT
)
3591 return ERR_PTR(-EINVAL
);
3593 /* Only one of each should be implemented */
3594 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3595 regulator_desc
->ops
->get_voltage_sel
);
3596 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3597 regulator_desc
->ops
->set_voltage_sel
);
3599 /* If we're using selectors we must implement list_voltage. */
3600 if (regulator_desc
->ops
->get_voltage_sel
&&
3601 !regulator_desc
->ops
->list_voltage
) {
3602 return ERR_PTR(-EINVAL
);
3604 if (regulator_desc
->ops
->set_voltage_sel
&&
3605 !regulator_desc
->ops
->list_voltage
) {
3606 return ERR_PTR(-EINVAL
);
3609 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3611 return ERR_PTR(-ENOMEM
);
3613 init_data
= regulator_of_get_init_data(dev
, regulator_desc
,
3614 &rdev
->dev
.of_node
);
3616 init_data
= config
->init_data
;
3617 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
3620 mutex_lock(®ulator_list_mutex
);
3622 mutex_init(&rdev
->mutex
);
3623 rdev
->reg_data
= config
->driver_data
;
3624 rdev
->owner
= regulator_desc
->owner
;
3625 rdev
->desc
= regulator_desc
;
3627 rdev
->regmap
= config
->regmap
;
3628 else if (dev_get_regmap(dev
, NULL
))
3629 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3630 else if (dev
->parent
)
3631 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3632 INIT_LIST_HEAD(&rdev
->consumer_list
);
3633 INIT_LIST_HEAD(&rdev
->list
);
3634 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3635 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3637 /* preform any regulator specific init */
3638 if (init_data
&& init_data
->regulator_init
) {
3639 ret
= init_data
->regulator_init(rdev
->reg_data
);
3644 /* register with sysfs */
3645 rdev
->dev
.class = ®ulator_class
;
3646 rdev
->dev
.parent
= dev
;
3647 dev_set_name(&rdev
->dev
, "regulator.%lu",
3648 (unsigned long) atomic_inc_return(®ulator_no
));
3649 ret
= device_register(&rdev
->dev
);
3651 put_device(&rdev
->dev
);
3655 dev_set_drvdata(&rdev
->dev
, rdev
);
3657 if ((config
->ena_gpio
|| config
->ena_gpio_initialized
) &&
3658 gpio_is_valid(config
->ena_gpio
)) {
3659 ret
= regulator_ena_gpio_request(rdev
, config
);
3661 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3662 config
->ena_gpio
, ret
);
3666 if (config
->ena_gpio_flags
& GPIOF_OUT_INIT_HIGH
)
3667 rdev
->ena_gpio_state
= 1;
3669 if (config
->ena_gpio_invert
)
3670 rdev
->ena_gpio_state
= !rdev
->ena_gpio_state
;
3673 /* set regulator constraints */
3675 constraints
= &init_data
->constraints
;
3677 ret
= set_machine_constraints(rdev
, constraints
);
3681 if (init_data
&& init_data
->supply_regulator
)
3682 supply
= init_data
->supply_regulator
;
3683 else if (regulator_desc
->supply_name
)
3684 supply
= regulator_desc
->supply_name
;
3687 struct regulator_dev
*r
;
3689 r
= regulator_dev_lookup(dev
, supply
, &ret
);
3691 if (ret
== -ENODEV
) {
3693 * No supply was specified for this regulator and
3694 * there will never be one.
3699 dev_err(dev
, "Failed to find supply %s\n", supply
);
3700 ret
= -EPROBE_DEFER
;
3704 ret
= set_supply(rdev
, r
);
3708 /* Enable supply if rail is enabled */
3709 if (_regulator_is_enabled(rdev
)) {
3710 ret
= regulator_enable(rdev
->supply
);
3717 /* add consumers devices */
3719 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3720 ret
= set_consumer_device_supply(rdev
,
3721 init_data
->consumer_supplies
[i
].dev_name
,
3722 init_data
->consumer_supplies
[i
].supply
);
3724 dev_err(dev
, "Failed to set supply %s\n",
3725 init_data
->consumer_supplies
[i
].supply
);
3726 goto unset_supplies
;
3731 list_add(&rdev
->list
, ®ulator_list
);
3733 rdev_init_debugfs(rdev
);
3735 mutex_unlock(®ulator_list_mutex
);
3739 unset_regulator_supplies(rdev
);
3743 _regulator_put(rdev
->supply
);
3744 regulator_ena_gpio_free(rdev
);
3745 kfree(rdev
->constraints
);
3747 device_unregister(&rdev
->dev
);
3748 /* device core frees rdev */
3749 rdev
= ERR_PTR(ret
);
3754 rdev
= ERR_PTR(ret
);
3757 EXPORT_SYMBOL_GPL(regulator_register
);
3760 * regulator_unregister - unregister regulator
3761 * @rdev: regulator to unregister
3763 * Called by regulator drivers to unregister a regulator.
3765 void regulator_unregister(struct regulator_dev
*rdev
)
3771 while (rdev
->use_count
--)
3772 regulator_disable(rdev
->supply
);
3773 regulator_put(rdev
->supply
);
3775 mutex_lock(®ulator_list_mutex
);
3776 debugfs_remove_recursive(rdev
->debugfs
);
3777 flush_work(&rdev
->disable_work
.work
);
3778 WARN_ON(rdev
->open_count
);
3779 unset_regulator_supplies(rdev
);
3780 list_del(&rdev
->list
);
3781 kfree(rdev
->constraints
);
3782 regulator_ena_gpio_free(rdev
);
3783 of_node_put(rdev
->dev
.of_node
);
3784 device_unregister(&rdev
->dev
);
3785 mutex_unlock(®ulator_list_mutex
);
3787 EXPORT_SYMBOL_GPL(regulator_unregister
);
3790 * regulator_suspend_prepare - prepare regulators for system wide suspend
3791 * @state: system suspend state
3793 * Configure each regulator with it's suspend operating parameters for state.
3794 * This will usually be called by machine suspend code prior to supending.
3796 int regulator_suspend_prepare(suspend_state_t state
)
3798 struct regulator_dev
*rdev
;
3801 /* ON is handled by regulator active state */
3802 if (state
== PM_SUSPEND_ON
)
3805 mutex_lock(®ulator_list_mutex
);
3806 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3808 mutex_lock(&rdev
->mutex
);
3809 ret
= suspend_prepare(rdev
, state
);
3810 mutex_unlock(&rdev
->mutex
);
3813 rdev_err(rdev
, "failed to prepare\n");
3818 mutex_unlock(®ulator_list_mutex
);
3821 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3824 * regulator_suspend_finish - resume regulators from system wide suspend
3826 * Turn on regulators that might be turned off by regulator_suspend_prepare
3827 * and that should be turned on according to the regulators properties.
3829 int regulator_suspend_finish(void)
3831 struct regulator_dev
*rdev
;
3834 mutex_lock(®ulator_list_mutex
);
3835 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3836 mutex_lock(&rdev
->mutex
);
3837 if (rdev
->use_count
> 0 || rdev
->constraints
->always_on
) {
3838 error
= _regulator_do_enable(rdev
);
3842 if (!have_full_constraints())
3844 if (!_regulator_is_enabled(rdev
))
3847 error
= _regulator_do_disable(rdev
);
3852 mutex_unlock(&rdev
->mutex
);
3854 mutex_unlock(®ulator_list_mutex
);
3857 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3860 * regulator_has_full_constraints - the system has fully specified constraints
3862 * Calling this function will cause the regulator API to disable all
3863 * regulators which have a zero use count and don't have an always_on
3864 * constraint in a late_initcall.
3866 * The intention is that this will become the default behaviour in a
3867 * future kernel release so users are encouraged to use this facility
3870 void regulator_has_full_constraints(void)
3872 has_full_constraints
= 1;
3874 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3877 * rdev_get_drvdata - get rdev regulator driver data
3880 * Get rdev regulator driver private data. This call can be used in the
3881 * regulator driver context.
3883 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3885 return rdev
->reg_data
;
3887 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3890 * regulator_get_drvdata - get regulator driver data
3891 * @regulator: regulator
3893 * Get regulator driver private data. This call can be used in the consumer
3894 * driver context when non API regulator specific functions need to be called.
3896 void *regulator_get_drvdata(struct regulator
*regulator
)
3898 return regulator
->rdev
->reg_data
;
3900 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3903 * regulator_set_drvdata - set regulator driver data
3904 * @regulator: regulator
3907 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3909 regulator
->rdev
->reg_data
= data
;
3911 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3914 * regulator_get_id - get regulator ID
3917 int rdev_get_id(struct regulator_dev
*rdev
)
3919 return rdev
->desc
->id
;
3921 EXPORT_SYMBOL_GPL(rdev_get_id
);
3923 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3927 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3929 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3931 return reg_init_data
->driver_data
;
3933 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3935 #ifdef CONFIG_DEBUG_FS
3936 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3937 size_t count
, loff_t
*ppos
)
3939 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3940 ssize_t len
, ret
= 0;
3941 struct regulator_map
*map
;
3946 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3947 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3949 rdev_get_name(map
->regulator
), map
->dev_name
,
3953 if (ret
> PAGE_SIZE
) {
3959 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3967 static const struct file_operations supply_map_fops
= {
3968 #ifdef CONFIG_DEBUG_FS
3969 .read
= supply_map_read_file
,
3970 .llseek
= default_llseek
,
3974 static int __init
regulator_init(void)
3978 ret
= class_register(®ulator_class
);
3980 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3982 pr_warn("regulator: Failed to create debugfs directory\n");
3984 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3987 regulator_dummy_init();
3992 /* init early to allow our consumers to complete system booting */
3993 core_initcall(regulator_init
);
3995 static int __init
regulator_init_complete(void)
3997 struct regulator_dev
*rdev
;
3998 const struct regulator_ops
*ops
;
3999 struct regulation_constraints
*c
;
4003 * Since DT doesn't provide an idiomatic mechanism for
4004 * enabling full constraints and since it's much more natural
4005 * with DT to provide them just assume that a DT enabled
4006 * system has full constraints.
4008 if (of_have_populated_dt())
4009 has_full_constraints
= true;
4011 mutex_lock(®ulator_list_mutex
);
4013 /* If we have a full configuration then disable any regulators
4014 * we have permission to change the status for and which are
4015 * not in use or always_on. This is effectively the default
4016 * for DT and ACPI as they have full constraints.
4018 list_for_each_entry(rdev
, ®ulator_list
, list
) {
4019 ops
= rdev
->desc
->ops
;
4020 c
= rdev
->constraints
;
4022 if (c
&& c
->always_on
)
4025 if (c
&& !(c
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
))
4028 mutex_lock(&rdev
->mutex
);
4030 if (rdev
->use_count
)
4033 /* If we can't read the status assume it's on. */
4034 if (ops
->is_enabled
)
4035 enabled
= ops
->is_enabled(rdev
);
4042 if (have_full_constraints()) {
4043 /* We log since this may kill the system if it
4045 rdev_info(rdev
, "disabling\n");
4046 ret
= _regulator_do_disable(rdev
);
4048 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4050 /* The intention is that in future we will
4051 * assume that full constraints are provided
4052 * so warn even if we aren't going to do
4055 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4059 mutex_unlock(&rdev
->mutex
);
4062 mutex_unlock(®ulator_list_mutex
);
4066 late_initcall_sync(regulator_init_complete
);