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 /* regulator_list_mutex lock 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 mutex_lock(&rdev
->mutex
);
1483 kfree(regulator
->supply_name
);
1484 list_del(®ulator
->list
);
1488 rdev
->exclusive
= 0;
1489 mutex_unlock(&rdev
->mutex
);
1491 module_put(rdev
->owner
);
1495 * regulator_put - "free" the regulator source
1496 * @regulator: regulator source
1498 * Note: drivers must ensure that all regulator_enable calls made on this
1499 * regulator source are balanced by regulator_disable calls prior to calling
1502 void regulator_put(struct regulator
*regulator
)
1504 mutex_lock(®ulator_list_mutex
);
1505 _regulator_put(regulator
);
1506 mutex_unlock(®ulator_list_mutex
);
1508 EXPORT_SYMBOL_GPL(regulator_put
);
1511 * regulator_register_supply_alias - Provide device alias for supply lookup
1513 * @dev: device that will be given as the regulator "consumer"
1514 * @id: Supply name or regulator ID
1515 * @alias_dev: device that should be used to lookup the supply
1516 * @alias_id: Supply name or regulator ID that should be used to lookup the
1519 * All lookups for id on dev will instead be conducted for alias_id on
1522 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1523 struct device
*alias_dev
,
1524 const char *alias_id
)
1526 struct regulator_supply_alias
*map
;
1528 map
= regulator_find_supply_alias(dev
, id
);
1532 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1537 map
->src_supply
= id
;
1538 map
->alias_dev
= alias_dev
;
1539 map
->alias_supply
= alias_id
;
1541 list_add(&map
->list
, ®ulator_supply_alias_list
);
1543 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1544 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1548 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1551 * regulator_unregister_supply_alias - Remove device alias
1553 * @dev: device that will be given as the regulator "consumer"
1554 * @id: Supply name or regulator ID
1556 * Remove a lookup alias if one exists for id on dev.
1558 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1560 struct regulator_supply_alias
*map
;
1562 map
= regulator_find_supply_alias(dev
, id
);
1564 list_del(&map
->list
);
1568 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1571 * regulator_bulk_register_supply_alias - register multiple aliases
1573 * @dev: device that will be given as the regulator "consumer"
1574 * @id: List of supply names or regulator IDs
1575 * @alias_dev: device that should be used to lookup the supply
1576 * @alias_id: List of supply names or regulator IDs that should be used to
1578 * @num_id: Number of aliases to register
1580 * @return 0 on success, an errno on failure.
1582 * This helper function allows drivers to register several supply
1583 * aliases in one operation. If any of the aliases cannot be
1584 * registered any aliases that were registered will be removed
1585 * before returning to the caller.
1587 int regulator_bulk_register_supply_alias(struct device
*dev
,
1588 const char *const *id
,
1589 struct device
*alias_dev
,
1590 const char *const *alias_id
,
1596 for (i
= 0; i
< num_id
; ++i
) {
1597 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1607 "Failed to create supply alias %s,%s -> %s,%s\n",
1608 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1611 regulator_unregister_supply_alias(dev
, id
[i
]);
1615 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1618 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1620 * @dev: device that will be given as the regulator "consumer"
1621 * @id: List of supply names or regulator IDs
1622 * @num_id: Number of aliases to unregister
1624 * This helper function allows drivers to unregister several supply
1625 * aliases in one operation.
1627 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1628 const char *const *id
,
1633 for (i
= 0; i
< num_id
; ++i
)
1634 regulator_unregister_supply_alias(dev
, id
[i
]);
1636 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1639 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1640 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1641 const struct regulator_config
*config
)
1643 struct regulator_enable_gpio
*pin
;
1644 struct gpio_desc
*gpiod
;
1647 gpiod
= gpio_to_desc(config
->ena_gpio
);
1649 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1650 if (pin
->gpiod
== gpiod
) {
1651 rdev_dbg(rdev
, "GPIO %d is already used\n",
1653 goto update_ena_gpio_to_rdev
;
1657 ret
= gpio_request_one(config
->ena_gpio
,
1658 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1659 rdev_get_name(rdev
));
1663 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1665 gpio_free(config
->ena_gpio
);
1670 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1671 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1673 update_ena_gpio_to_rdev
:
1674 pin
->request_count
++;
1675 rdev
->ena_pin
= pin
;
1679 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1681 struct regulator_enable_gpio
*pin
, *n
;
1686 /* Free the GPIO only in case of no use */
1687 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1688 if (pin
->gpiod
== rdev
->ena_pin
->gpiod
) {
1689 if (pin
->request_count
<= 1) {
1690 pin
->request_count
= 0;
1691 gpiod_put(pin
->gpiod
);
1692 list_del(&pin
->list
);
1694 rdev
->ena_pin
= NULL
;
1697 pin
->request_count
--;
1704 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1705 * @rdev: regulator_dev structure
1706 * @enable: enable GPIO at initial use?
1708 * GPIO is enabled in case of initial use. (enable_count is 0)
1709 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1711 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1713 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1719 /* Enable GPIO at initial use */
1720 if (pin
->enable_count
== 0)
1721 gpiod_set_value_cansleep(pin
->gpiod
,
1722 !pin
->ena_gpio_invert
);
1724 pin
->enable_count
++;
1726 if (pin
->enable_count
> 1) {
1727 pin
->enable_count
--;
1731 /* Disable GPIO if not used */
1732 if (pin
->enable_count
<= 1) {
1733 gpiod_set_value_cansleep(pin
->gpiod
,
1734 pin
->ena_gpio_invert
);
1735 pin
->enable_count
= 0;
1743 * _regulator_enable_delay - a delay helper function
1744 * @delay: time to delay in microseconds
1746 * Delay for the requested amount of time as per the guidelines in:
1748 * Documentation/timers/timers-howto.txt
1750 * The assumption here is that regulators will never be enabled in
1751 * atomic context and therefore sleeping functions can be used.
1753 static void _regulator_enable_delay(unsigned int delay
)
1755 unsigned int ms
= delay
/ 1000;
1756 unsigned int us
= delay
% 1000;
1760 * For small enough values, handle super-millisecond
1761 * delays in the usleep_range() call below.
1770 * Give the scheduler some room to coalesce with any other
1771 * wakeup sources. For delays shorter than 10 us, don't even
1772 * bother setting up high-resolution timers and just busy-
1776 usleep_range(us
, us
+ 100);
1781 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1785 /* Query before enabling in case configuration dependent. */
1786 ret
= _regulator_get_enable_time(rdev
);
1790 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1794 trace_regulator_enable(rdev_get_name(rdev
));
1796 if (rdev
->desc
->off_on_delay
) {
1797 /* if needed, keep a distance of off_on_delay from last time
1798 * this regulator was disabled.
1800 unsigned long start_jiffy
= jiffies
;
1801 unsigned long intended
, max_delay
, remaining
;
1803 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
1804 intended
= rdev
->last_off_jiffy
+ max_delay
;
1806 if (time_before(start_jiffy
, intended
)) {
1807 /* calc remaining jiffies to deal with one-time
1809 * in case of multiple timer wrapping, either it can be
1810 * detected by out-of-range remaining, or it cannot be
1811 * detected and we gets a panelty of
1812 * _regulator_enable_delay().
1814 remaining
= intended
- start_jiffy
;
1815 if (remaining
<= max_delay
)
1816 _regulator_enable_delay(
1817 jiffies_to_usecs(remaining
));
1821 if (rdev
->ena_pin
) {
1822 ret
= regulator_ena_gpio_ctrl(rdev
, true);
1825 rdev
->ena_gpio_state
= 1;
1826 } else if (rdev
->desc
->ops
->enable
) {
1827 ret
= rdev
->desc
->ops
->enable(rdev
);
1834 /* Allow the regulator to ramp; it would be useful to extend
1835 * this for bulk operations so that the regulators can ramp
1837 trace_regulator_enable_delay(rdev_get_name(rdev
));
1839 _regulator_enable_delay(delay
);
1841 trace_regulator_enable_complete(rdev_get_name(rdev
));
1846 /* locks held by regulator_enable() */
1847 static int _regulator_enable(struct regulator_dev
*rdev
)
1851 /* check voltage and requested load before enabling */
1852 if (rdev
->constraints
&&
1853 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1854 drms_uA_update(rdev
);
1856 if (rdev
->use_count
== 0) {
1857 /* The regulator may on if it's not switchable or left on */
1858 ret
= _regulator_is_enabled(rdev
);
1859 if (ret
== -EINVAL
|| ret
== 0) {
1860 if (!_regulator_can_change_status(rdev
))
1863 ret
= _regulator_do_enable(rdev
);
1867 } else if (ret
< 0) {
1868 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1871 /* Fallthrough on positive return values - already enabled */
1880 * regulator_enable - enable regulator output
1881 * @regulator: regulator source
1883 * Request that the regulator be enabled with the regulator output at
1884 * the predefined voltage or current value. Calls to regulator_enable()
1885 * must be balanced with calls to regulator_disable().
1887 * NOTE: the output value can be set by other drivers, boot loader or may be
1888 * hardwired in the regulator.
1890 int regulator_enable(struct regulator
*regulator
)
1892 struct regulator_dev
*rdev
= regulator
->rdev
;
1895 if (regulator
->always_on
)
1899 ret
= regulator_enable(rdev
->supply
);
1904 mutex_lock(&rdev
->mutex
);
1905 ret
= _regulator_enable(rdev
);
1906 mutex_unlock(&rdev
->mutex
);
1908 if (ret
!= 0 && rdev
->supply
)
1909 regulator_disable(rdev
->supply
);
1913 EXPORT_SYMBOL_GPL(regulator_enable
);
1915 static int _regulator_do_disable(struct regulator_dev
*rdev
)
1919 trace_regulator_disable(rdev_get_name(rdev
));
1921 if (rdev
->ena_pin
) {
1922 ret
= regulator_ena_gpio_ctrl(rdev
, false);
1925 rdev
->ena_gpio_state
= 0;
1927 } else if (rdev
->desc
->ops
->disable
) {
1928 ret
= rdev
->desc
->ops
->disable(rdev
);
1933 /* cares about last_off_jiffy only if off_on_delay is required by
1936 if (rdev
->desc
->off_on_delay
)
1937 rdev
->last_off_jiffy
= jiffies
;
1939 trace_regulator_disable_complete(rdev_get_name(rdev
));
1944 /* locks held by regulator_disable() */
1945 static int _regulator_disable(struct regulator_dev
*rdev
)
1949 if (WARN(rdev
->use_count
<= 0,
1950 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1953 /* are we the last user and permitted to disable ? */
1954 if (rdev
->use_count
== 1 &&
1955 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1957 /* we are last user */
1958 if (_regulator_can_change_status(rdev
)) {
1959 ret
= _notifier_call_chain(rdev
,
1960 REGULATOR_EVENT_PRE_DISABLE
,
1962 if (ret
& NOTIFY_STOP_MASK
)
1965 ret
= _regulator_do_disable(rdev
);
1967 rdev_err(rdev
, "failed to disable\n");
1968 _notifier_call_chain(rdev
,
1969 REGULATOR_EVENT_ABORT_DISABLE
,
1973 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1977 rdev
->use_count
= 0;
1978 } else if (rdev
->use_count
> 1) {
1980 if (rdev
->constraints
&&
1981 (rdev
->constraints
->valid_ops_mask
&
1982 REGULATOR_CHANGE_DRMS
))
1983 drms_uA_update(rdev
);
1992 * regulator_disable - disable regulator output
1993 * @regulator: regulator source
1995 * Disable the regulator output voltage or current. Calls to
1996 * regulator_enable() must be balanced with calls to
1997 * regulator_disable().
1999 * NOTE: this will only disable the regulator output if no other consumer
2000 * devices have it enabled, the regulator device supports disabling and
2001 * machine constraints permit this operation.
2003 int regulator_disable(struct regulator
*regulator
)
2005 struct regulator_dev
*rdev
= regulator
->rdev
;
2008 if (regulator
->always_on
)
2011 mutex_lock(&rdev
->mutex
);
2012 ret
= _regulator_disable(rdev
);
2013 mutex_unlock(&rdev
->mutex
);
2015 if (ret
== 0 && rdev
->supply
)
2016 regulator_disable(rdev
->supply
);
2020 EXPORT_SYMBOL_GPL(regulator_disable
);
2022 /* locks held by regulator_force_disable() */
2023 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2027 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2028 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2029 if (ret
& NOTIFY_STOP_MASK
)
2032 ret
= _regulator_do_disable(rdev
);
2034 rdev_err(rdev
, "failed to force disable\n");
2035 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2036 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2040 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2041 REGULATOR_EVENT_DISABLE
, NULL
);
2047 * regulator_force_disable - force disable regulator output
2048 * @regulator: regulator source
2050 * Forcibly disable the regulator output voltage or current.
2051 * NOTE: this *will* disable the regulator output even if other consumer
2052 * devices have it enabled. This should be used for situations when device
2053 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2055 int regulator_force_disable(struct regulator
*regulator
)
2057 struct regulator_dev
*rdev
= regulator
->rdev
;
2060 mutex_lock(&rdev
->mutex
);
2061 regulator
->uA_load
= 0;
2062 ret
= _regulator_force_disable(regulator
->rdev
);
2063 mutex_unlock(&rdev
->mutex
);
2066 while (rdev
->open_count
--)
2067 regulator_disable(rdev
->supply
);
2071 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2073 static void regulator_disable_work(struct work_struct
*work
)
2075 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2079 mutex_lock(&rdev
->mutex
);
2081 BUG_ON(!rdev
->deferred_disables
);
2083 count
= rdev
->deferred_disables
;
2084 rdev
->deferred_disables
= 0;
2086 for (i
= 0; i
< count
; i
++) {
2087 ret
= _regulator_disable(rdev
);
2089 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2092 mutex_unlock(&rdev
->mutex
);
2095 for (i
= 0; i
< count
; i
++) {
2096 ret
= regulator_disable(rdev
->supply
);
2099 "Supply disable failed: %d\n", ret
);
2106 * regulator_disable_deferred - disable regulator output with delay
2107 * @regulator: regulator source
2108 * @ms: miliseconds until the regulator is disabled
2110 * Execute regulator_disable() on the regulator after a delay. This
2111 * is intended for use with devices that require some time to quiesce.
2113 * NOTE: this will only disable the regulator output if no other consumer
2114 * devices have it enabled, the regulator device supports disabling and
2115 * machine constraints permit this operation.
2117 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2119 struct regulator_dev
*rdev
= regulator
->rdev
;
2122 if (regulator
->always_on
)
2126 return regulator_disable(regulator
);
2128 mutex_lock(&rdev
->mutex
);
2129 rdev
->deferred_disables
++;
2130 mutex_unlock(&rdev
->mutex
);
2132 ret
= queue_delayed_work(system_power_efficient_wq
,
2133 &rdev
->disable_work
,
2134 msecs_to_jiffies(ms
));
2140 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2142 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2144 /* A GPIO control always takes precedence */
2146 return rdev
->ena_gpio_state
;
2148 /* If we don't know then assume that the regulator is always on */
2149 if (!rdev
->desc
->ops
->is_enabled
)
2152 return rdev
->desc
->ops
->is_enabled(rdev
);
2156 * regulator_is_enabled - is the regulator output enabled
2157 * @regulator: regulator source
2159 * Returns positive if the regulator driver backing the source/client
2160 * has requested that the device be enabled, zero if it hasn't, else a
2161 * negative errno code.
2163 * Note that the device backing this regulator handle can have multiple
2164 * users, so it might be enabled even if regulator_enable() was never
2165 * called for this particular source.
2167 int regulator_is_enabled(struct regulator
*regulator
)
2171 if (regulator
->always_on
)
2174 mutex_lock(®ulator
->rdev
->mutex
);
2175 ret
= _regulator_is_enabled(regulator
->rdev
);
2176 mutex_unlock(®ulator
->rdev
->mutex
);
2180 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2183 * regulator_can_change_voltage - check if regulator can change voltage
2184 * @regulator: regulator source
2186 * Returns positive if the regulator driver backing the source/client
2187 * can change its voltage, false otherwise. Useful for detecting fixed
2188 * or dummy regulators and disabling voltage change logic in the client
2191 int regulator_can_change_voltage(struct regulator
*regulator
)
2193 struct regulator_dev
*rdev
= regulator
->rdev
;
2195 if (rdev
->constraints
&&
2196 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2197 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2200 if (rdev
->desc
->continuous_voltage_range
&&
2201 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2202 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2208 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2211 * regulator_count_voltages - count regulator_list_voltage() selectors
2212 * @regulator: regulator source
2214 * Returns number of selectors, or negative errno. Selectors are
2215 * numbered starting at zero, and typically correspond to bitfields
2216 * in hardware registers.
2218 int regulator_count_voltages(struct regulator
*regulator
)
2220 struct regulator_dev
*rdev
= regulator
->rdev
;
2222 if (rdev
->desc
->n_voltages
)
2223 return rdev
->desc
->n_voltages
;
2228 return regulator_count_voltages(rdev
->supply
);
2230 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2233 * regulator_list_voltage - enumerate supported voltages
2234 * @regulator: regulator source
2235 * @selector: identify voltage to list
2236 * Context: can sleep
2238 * Returns a voltage that can be passed to @regulator_set_voltage(),
2239 * zero if this selector code can't be used on this system, or a
2242 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2244 struct regulator_dev
*rdev
= regulator
->rdev
;
2245 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2248 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2249 return rdev
->desc
->fixed_uV
;
2251 if (ops
->list_voltage
) {
2252 if (selector
>= rdev
->desc
->n_voltages
)
2254 mutex_lock(&rdev
->mutex
);
2255 ret
= ops
->list_voltage(rdev
, selector
);
2256 mutex_unlock(&rdev
->mutex
);
2257 } else if (rdev
->supply
) {
2258 ret
= regulator_list_voltage(rdev
->supply
, selector
);
2264 if (ret
< rdev
->constraints
->min_uV
)
2266 else if (ret
> rdev
->constraints
->max_uV
)
2272 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2275 * regulator_get_regmap - get the regulator's register map
2276 * @regulator: regulator source
2278 * Returns the register map for the given regulator, or an ERR_PTR value
2279 * if the regulator doesn't use regmap.
2281 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
2283 struct regmap
*map
= regulator
->rdev
->regmap
;
2285 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
2289 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2290 * @regulator: regulator source
2291 * @vsel_reg: voltage selector register, output parameter
2292 * @vsel_mask: mask for voltage selector bitfield, output parameter
2294 * Returns the hardware register offset and bitmask used for setting the
2295 * regulator voltage. This might be useful when configuring voltage-scaling
2296 * hardware or firmware that can make I2C requests behind the kernel's back,
2299 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2300 * and 0 is returned, otherwise a negative errno is returned.
2302 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
2304 unsigned *vsel_mask
)
2306 struct regulator_dev
*rdev
= regulator
->rdev
;
2307 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2309 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2312 *vsel_reg
= rdev
->desc
->vsel_reg
;
2313 *vsel_mask
= rdev
->desc
->vsel_mask
;
2317 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
2320 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2321 * @regulator: regulator source
2322 * @selector: identify voltage to list
2324 * Converts the selector to a hardware-specific voltage selector that can be
2325 * directly written to the regulator registers. The address of the voltage
2326 * register can be determined by calling @regulator_get_hardware_vsel_register.
2328 * On error a negative errno is returned.
2330 int regulator_list_hardware_vsel(struct regulator
*regulator
,
2333 struct regulator_dev
*rdev
= regulator
->rdev
;
2334 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2336 if (selector
>= rdev
->desc
->n_voltages
)
2338 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2343 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
2346 * regulator_get_linear_step - return the voltage step size between VSEL values
2347 * @regulator: regulator source
2349 * Returns the voltage step size between VSEL values for linear
2350 * regulators, or return 0 if the regulator isn't a linear regulator.
2352 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2354 struct regulator_dev
*rdev
= regulator
->rdev
;
2356 return rdev
->desc
->uV_step
;
2358 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2361 * regulator_is_supported_voltage - check if a voltage range can be supported
2363 * @regulator: Regulator to check.
2364 * @min_uV: Minimum required voltage in uV.
2365 * @max_uV: Maximum required voltage in uV.
2367 * Returns a boolean or a negative error code.
2369 int regulator_is_supported_voltage(struct regulator
*regulator
,
2370 int min_uV
, int max_uV
)
2372 struct regulator_dev
*rdev
= regulator
->rdev
;
2373 int i
, voltages
, ret
;
2375 /* If we can't change voltage check the current voltage */
2376 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2377 ret
= regulator_get_voltage(regulator
);
2379 return min_uV
<= ret
&& ret
<= max_uV
;
2384 /* Any voltage within constrains range is fine? */
2385 if (rdev
->desc
->continuous_voltage_range
)
2386 return min_uV
>= rdev
->constraints
->min_uV
&&
2387 max_uV
<= rdev
->constraints
->max_uV
;
2389 ret
= regulator_count_voltages(regulator
);
2394 for (i
= 0; i
< voltages
; i
++) {
2395 ret
= regulator_list_voltage(regulator
, i
);
2397 if (ret
>= min_uV
&& ret
<= max_uV
)
2403 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2405 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
2406 int min_uV
, int max_uV
,
2409 struct pre_voltage_change_data data
;
2412 data
.old_uV
= _regulator_get_voltage(rdev
);
2413 data
.min_uV
= min_uV
;
2414 data
.max_uV
= max_uV
;
2415 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2417 if (ret
& NOTIFY_STOP_MASK
)
2420 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
2424 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2425 (void *)data
.old_uV
);
2430 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
2431 int uV
, unsigned selector
)
2433 struct pre_voltage_change_data data
;
2436 data
.old_uV
= _regulator_get_voltage(rdev
);
2439 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2441 if (ret
& NOTIFY_STOP_MASK
)
2444 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
2448 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2449 (void *)data
.old_uV
);
2454 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2455 int min_uV
, int max_uV
)
2460 unsigned int selector
;
2461 int old_selector
= -1;
2463 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2465 min_uV
+= rdev
->constraints
->uV_offset
;
2466 max_uV
+= rdev
->constraints
->uV_offset
;
2469 * If we can't obtain the old selector there is not enough
2470 * info to call set_voltage_time_sel().
2472 if (_regulator_is_enabled(rdev
) &&
2473 rdev
->desc
->ops
->set_voltage_time_sel
&&
2474 rdev
->desc
->ops
->get_voltage_sel
) {
2475 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2476 if (old_selector
< 0)
2477 return old_selector
;
2480 if (rdev
->desc
->ops
->set_voltage
) {
2481 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
2485 if (rdev
->desc
->ops
->list_voltage
)
2486 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2489 best_val
= _regulator_get_voltage(rdev
);
2492 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2493 if (rdev
->desc
->ops
->map_voltage
) {
2494 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2497 if (rdev
->desc
->ops
->list_voltage
==
2498 regulator_list_voltage_linear
)
2499 ret
= regulator_map_voltage_linear(rdev
,
2501 else if (rdev
->desc
->ops
->list_voltage
==
2502 regulator_list_voltage_linear_range
)
2503 ret
= regulator_map_voltage_linear_range(rdev
,
2506 ret
= regulator_map_voltage_iterate(rdev
,
2511 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2512 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2514 if (old_selector
== selector
)
2517 ret
= _regulator_call_set_voltage_sel(
2518 rdev
, best_val
, selector
);
2527 /* Call set_voltage_time_sel if successfully obtained old_selector */
2528 if (ret
== 0 && !rdev
->constraints
->ramp_disable
&& old_selector
>= 0
2529 && old_selector
!= selector
) {
2531 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2532 old_selector
, selector
);
2534 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2539 /* Insert any necessary delays */
2540 if (delay
>= 1000) {
2541 mdelay(delay
/ 1000);
2542 udelay(delay
% 1000);
2548 if (ret
== 0 && best_val
>= 0) {
2549 unsigned long data
= best_val
;
2551 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2555 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2561 * regulator_set_voltage - set regulator output voltage
2562 * @regulator: regulator source
2563 * @min_uV: Minimum required voltage in uV
2564 * @max_uV: Maximum acceptable voltage in uV
2566 * Sets a voltage regulator to the desired output voltage. This can be set
2567 * during any regulator state. IOW, regulator can be disabled or enabled.
2569 * If the regulator is enabled then the voltage will change to the new value
2570 * immediately otherwise if the regulator is disabled the regulator will
2571 * output at the new voltage when enabled.
2573 * NOTE: If the regulator is shared between several devices then the lowest
2574 * request voltage that meets the system constraints will be used.
2575 * Regulator system constraints must be set for this regulator before
2576 * calling this function otherwise this call will fail.
2578 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2580 struct regulator_dev
*rdev
= regulator
->rdev
;
2582 int old_min_uV
, old_max_uV
;
2585 mutex_lock(&rdev
->mutex
);
2587 /* If we're setting the same range as last time the change
2588 * should be a noop (some cpufreq implementations use the same
2589 * voltage for multiple frequencies, for example).
2591 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2594 /* If we're trying to set a range that overlaps the current voltage,
2595 * return succesfully even though the regulator does not support
2596 * changing the voltage.
2598 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2599 current_uV
= _regulator_get_voltage(rdev
);
2600 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
2601 regulator
->min_uV
= min_uV
;
2602 regulator
->max_uV
= max_uV
;
2608 if (!rdev
->desc
->ops
->set_voltage
&&
2609 !rdev
->desc
->ops
->set_voltage_sel
) {
2614 /* constraints check */
2615 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2619 /* restore original values in case of error */
2620 old_min_uV
= regulator
->min_uV
;
2621 old_max_uV
= regulator
->max_uV
;
2622 regulator
->min_uV
= min_uV
;
2623 regulator
->max_uV
= max_uV
;
2625 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2629 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2634 mutex_unlock(&rdev
->mutex
);
2637 regulator
->min_uV
= old_min_uV
;
2638 regulator
->max_uV
= old_max_uV
;
2639 mutex_unlock(&rdev
->mutex
);
2642 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2645 * regulator_set_voltage_time - get raise/fall time
2646 * @regulator: regulator source
2647 * @old_uV: starting voltage in microvolts
2648 * @new_uV: target voltage in microvolts
2650 * Provided with the starting and ending voltage, this function attempts to
2651 * calculate the time in microseconds required to rise or fall to this new
2654 int regulator_set_voltage_time(struct regulator
*regulator
,
2655 int old_uV
, int new_uV
)
2657 struct regulator_dev
*rdev
= regulator
->rdev
;
2658 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2664 /* Currently requires operations to do this */
2665 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2666 || !rdev
->desc
->n_voltages
)
2669 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2670 /* We only look for exact voltage matches here */
2671 voltage
= regulator_list_voltage(regulator
, i
);
2676 if (voltage
== old_uV
)
2678 if (voltage
== new_uV
)
2682 if (old_sel
< 0 || new_sel
< 0)
2685 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2687 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2690 * regulator_set_voltage_time_sel - get raise/fall time
2691 * @rdev: regulator source device
2692 * @old_selector: selector for starting voltage
2693 * @new_selector: selector for target voltage
2695 * Provided with the starting and target voltage selectors, this function
2696 * returns time in microseconds required to rise or fall to this new voltage
2698 * Drivers providing ramp_delay in regulation_constraints can use this as their
2699 * set_voltage_time_sel() operation.
2701 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2702 unsigned int old_selector
,
2703 unsigned int new_selector
)
2705 unsigned int ramp_delay
= 0;
2706 int old_volt
, new_volt
;
2708 if (rdev
->constraints
->ramp_delay
)
2709 ramp_delay
= rdev
->constraints
->ramp_delay
;
2710 else if (rdev
->desc
->ramp_delay
)
2711 ramp_delay
= rdev
->desc
->ramp_delay
;
2713 if (ramp_delay
== 0) {
2714 rdev_warn(rdev
, "ramp_delay not set\n");
2719 if (!rdev
->desc
->ops
->list_voltage
)
2722 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2723 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2725 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2727 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2730 * regulator_sync_voltage - re-apply last regulator output voltage
2731 * @regulator: regulator source
2733 * Re-apply the last configured voltage. This is intended to be used
2734 * where some external control source the consumer is cooperating with
2735 * has caused the configured voltage to change.
2737 int regulator_sync_voltage(struct regulator
*regulator
)
2739 struct regulator_dev
*rdev
= regulator
->rdev
;
2740 int ret
, min_uV
, max_uV
;
2742 mutex_lock(&rdev
->mutex
);
2744 if (!rdev
->desc
->ops
->set_voltage
&&
2745 !rdev
->desc
->ops
->set_voltage_sel
) {
2750 /* This is only going to work if we've had a voltage configured. */
2751 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2756 min_uV
= regulator
->min_uV
;
2757 max_uV
= regulator
->max_uV
;
2759 /* This should be a paranoia check... */
2760 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2764 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2768 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2771 mutex_unlock(&rdev
->mutex
);
2774 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2776 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2780 if (rdev
->desc
->ops
->get_voltage_sel
) {
2781 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2784 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2785 } else if (rdev
->desc
->ops
->get_voltage
) {
2786 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2787 } else if (rdev
->desc
->ops
->list_voltage
) {
2788 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2789 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
2790 ret
= rdev
->desc
->fixed_uV
;
2791 } else if (rdev
->supply
) {
2792 ret
= regulator_get_voltage(rdev
->supply
);
2799 return ret
- rdev
->constraints
->uV_offset
;
2803 * regulator_get_voltage - get regulator output voltage
2804 * @regulator: regulator source
2806 * This returns the current regulator voltage in uV.
2808 * NOTE: If the regulator is disabled it will return the voltage value. This
2809 * function should not be used to determine regulator state.
2811 int regulator_get_voltage(struct regulator
*regulator
)
2815 mutex_lock(®ulator
->rdev
->mutex
);
2817 ret
= _regulator_get_voltage(regulator
->rdev
);
2819 mutex_unlock(®ulator
->rdev
->mutex
);
2823 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2826 * regulator_set_current_limit - set regulator output current limit
2827 * @regulator: regulator source
2828 * @min_uA: Minimum supported current in uA
2829 * @max_uA: Maximum supported current in uA
2831 * Sets current sink to the desired output current. This can be set during
2832 * any regulator state. IOW, regulator can be disabled or enabled.
2834 * If the regulator is enabled then the current will change to the new value
2835 * immediately otherwise if the regulator is disabled the regulator will
2836 * output at the new current when enabled.
2838 * NOTE: Regulator system constraints must be set for this regulator before
2839 * calling this function otherwise this call will fail.
2841 int regulator_set_current_limit(struct regulator
*regulator
,
2842 int min_uA
, int max_uA
)
2844 struct regulator_dev
*rdev
= regulator
->rdev
;
2847 mutex_lock(&rdev
->mutex
);
2850 if (!rdev
->desc
->ops
->set_current_limit
) {
2855 /* constraints check */
2856 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2860 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2862 mutex_unlock(&rdev
->mutex
);
2865 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2867 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2871 mutex_lock(&rdev
->mutex
);
2874 if (!rdev
->desc
->ops
->get_current_limit
) {
2879 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2881 mutex_unlock(&rdev
->mutex
);
2886 * regulator_get_current_limit - get regulator output current
2887 * @regulator: regulator source
2889 * This returns the current supplied by the specified current sink in uA.
2891 * NOTE: If the regulator is disabled it will return the current value. This
2892 * function should not be used to determine regulator state.
2894 int regulator_get_current_limit(struct regulator
*regulator
)
2896 return _regulator_get_current_limit(regulator
->rdev
);
2898 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2901 * regulator_set_mode - set regulator operating mode
2902 * @regulator: regulator source
2903 * @mode: operating mode - one of the REGULATOR_MODE constants
2905 * Set regulator operating mode to increase regulator efficiency or improve
2906 * regulation performance.
2908 * NOTE: Regulator system constraints must be set for this regulator before
2909 * calling this function otherwise this call will fail.
2911 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2913 struct regulator_dev
*rdev
= regulator
->rdev
;
2915 int regulator_curr_mode
;
2917 mutex_lock(&rdev
->mutex
);
2920 if (!rdev
->desc
->ops
->set_mode
) {
2925 /* return if the same mode is requested */
2926 if (rdev
->desc
->ops
->get_mode
) {
2927 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2928 if (regulator_curr_mode
== mode
) {
2934 /* constraints check */
2935 ret
= regulator_mode_constrain(rdev
, &mode
);
2939 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2941 mutex_unlock(&rdev
->mutex
);
2944 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2946 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2950 mutex_lock(&rdev
->mutex
);
2953 if (!rdev
->desc
->ops
->get_mode
) {
2958 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2960 mutex_unlock(&rdev
->mutex
);
2965 * regulator_get_mode - get regulator operating mode
2966 * @regulator: regulator source
2968 * Get the current regulator operating mode.
2970 unsigned int regulator_get_mode(struct regulator
*regulator
)
2972 return _regulator_get_mode(regulator
->rdev
);
2974 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2977 * regulator_set_optimum_mode - set regulator optimum operating mode
2978 * @regulator: regulator source
2979 * @uA_load: load current
2981 * Notifies the regulator core of a new device load. This is then used by
2982 * DRMS (if enabled by constraints) to set the most efficient regulator
2983 * operating mode for the new regulator loading.
2985 * Consumer devices notify their supply regulator of the maximum power
2986 * they will require (can be taken from device datasheet in the power
2987 * consumption tables) when they change operational status and hence power
2988 * state. Examples of operational state changes that can affect power
2989 * consumption are :-
2991 * o Device is opened / closed.
2992 * o Device I/O is about to begin or has just finished.
2993 * o Device is idling in between work.
2995 * This information is also exported via sysfs to userspace.
2997 * DRMS will sum the total requested load on the regulator and change
2998 * to the most efficient operating mode if platform constraints allow.
3000 * Returns the new regulator mode or error.
3002 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
3004 struct regulator_dev
*rdev
= regulator
->rdev
;
3005 struct regulator
*consumer
;
3006 int ret
, output_uV
, input_uV
= 0, total_uA_load
= 0;
3010 input_uV
= regulator_get_voltage(rdev
->supply
);
3012 mutex_lock(&rdev
->mutex
);
3015 * first check to see if we can set modes at all, otherwise just
3016 * tell the consumer everything is OK.
3018 regulator
->uA_load
= uA_load
;
3019 ret
= regulator_check_drms(rdev
);
3025 if (!rdev
->desc
->ops
->get_optimum_mode
)
3029 * we can actually do this so any errors are indicators of
3030 * potential real failure.
3034 if (!rdev
->desc
->ops
->set_mode
)
3037 /* get output voltage */
3038 output_uV
= _regulator_get_voltage(rdev
);
3039 if (output_uV
<= 0) {
3040 rdev_err(rdev
, "invalid output voltage found\n");
3044 /* No supply? Use constraint voltage */
3046 input_uV
= rdev
->constraints
->input_uV
;
3047 if (input_uV
<= 0) {
3048 rdev_err(rdev
, "invalid input voltage found\n");
3052 /* calc total requested load for this regulator */
3053 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
3054 total_uA_load
+= consumer
->uA_load
;
3056 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
3057 input_uV
, output_uV
,
3059 ret
= regulator_mode_constrain(rdev
, &mode
);
3061 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
3062 total_uA_load
, input_uV
, output_uV
);
3066 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
3068 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
3073 mutex_unlock(&rdev
->mutex
);
3076 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
3079 * regulator_allow_bypass - allow the regulator to go into bypass mode
3081 * @regulator: Regulator to configure
3082 * @enable: enable or disable bypass mode
3084 * Allow the regulator to go into bypass mode if all other consumers
3085 * for the regulator also enable bypass mode and the machine
3086 * constraints allow this. Bypass mode means that the regulator is
3087 * simply passing the input directly to the output with no regulation.
3089 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3091 struct regulator_dev
*rdev
= regulator
->rdev
;
3094 if (!rdev
->desc
->ops
->set_bypass
)
3097 if (rdev
->constraints
&&
3098 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
3101 mutex_lock(&rdev
->mutex
);
3103 if (enable
&& !regulator
->bypass
) {
3104 rdev
->bypass_count
++;
3106 if (rdev
->bypass_count
== rdev
->open_count
) {
3107 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3109 rdev
->bypass_count
--;
3112 } else if (!enable
&& regulator
->bypass
) {
3113 rdev
->bypass_count
--;
3115 if (rdev
->bypass_count
!= rdev
->open_count
) {
3116 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3118 rdev
->bypass_count
++;
3123 regulator
->bypass
= enable
;
3125 mutex_unlock(&rdev
->mutex
);
3129 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3132 * regulator_register_notifier - register regulator event notifier
3133 * @regulator: regulator source
3134 * @nb: notifier block
3136 * Register notifier block to receive regulator events.
3138 int regulator_register_notifier(struct regulator
*regulator
,
3139 struct notifier_block
*nb
)
3141 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3144 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3147 * regulator_unregister_notifier - unregister regulator event notifier
3148 * @regulator: regulator source
3149 * @nb: notifier block
3151 * Unregister regulator event notifier block.
3153 int regulator_unregister_notifier(struct regulator
*regulator
,
3154 struct notifier_block
*nb
)
3156 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3159 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3161 /* notify regulator consumers and downstream regulator consumers.
3162 * Note mutex must be held by caller.
3164 static int _notifier_call_chain(struct regulator_dev
*rdev
,
3165 unsigned long event
, void *data
)
3167 /* call rdev chain first */
3168 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3172 * regulator_bulk_get - get multiple regulator consumers
3174 * @dev: Device to supply
3175 * @num_consumers: Number of consumers to register
3176 * @consumers: Configuration of consumers; clients are stored here.
3178 * @return 0 on success, an errno on failure.
3180 * This helper function allows drivers to get several regulator
3181 * consumers in one operation. If any of the regulators cannot be
3182 * acquired then any regulators that were allocated will be freed
3183 * before returning to the caller.
3185 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3186 struct regulator_bulk_data
*consumers
)
3191 for (i
= 0; i
< num_consumers
; i
++)
3192 consumers
[i
].consumer
= NULL
;
3194 for (i
= 0; i
< num_consumers
; i
++) {
3195 consumers
[i
].consumer
= regulator_get(dev
,
3196 consumers
[i
].supply
);
3197 if (IS_ERR(consumers
[i
].consumer
)) {
3198 ret
= PTR_ERR(consumers
[i
].consumer
);
3199 dev_err(dev
, "Failed to get supply '%s': %d\n",
3200 consumers
[i
].supply
, ret
);
3201 consumers
[i
].consumer
= NULL
;
3210 regulator_put(consumers
[i
].consumer
);
3214 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3216 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3218 struct regulator_bulk_data
*bulk
= data
;
3220 bulk
->ret
= regulator_enable(bulk
->consumer
);
3224 * regulator_bulk_enable - enable multiple regulator consumers
3226 * @num_consumers: Number of consumers
3227 * @consumers: Consumer data; clients are stored here.
3228 * @return 0 on success, an errno on failure
3230 * This convenience API allows consumers to enable multiple regulator
3231 * clients in a single API call. If any consumers cannot be enabled
3232 * then any others that were enabled will be disabled again prior to
3235 int regulator_bulk_enable(int num_consumers
,
3236 struct regulator_bulk_data
*consumers
)
3238 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3242 for (i
= 0; i
< num_consumers
; i
++) {
3243 if (consumers
[i
].consumer
->always_on
)
3244 consumers
[i
].ret
= 0;
3246 async_schedule_domain(regulator_bulk_enable_async
,
3247 &consumers
[i
], &async_domain
);
3250 async_synchronize_full_domain(&async_domain
);
3252 /* If any consumer failed we need to unwind any that succeeded */
3253 for (i
= 0; i
< num_consumers
; i
++) {
3254 if (consumers
[i
].ret
!= 0) {
3255 ret
= consumers
[i
].ret
;
3263 for (i
= 0; i
< num_consumers
; i
++) {
3264 if (consumers
[i
].ret
< 0)
3265 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3268 regulator_disable(consumers
[i
].consumer
);
3273 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3276 * regulator_bulk_disable - disable multiple regulator consumers
3278 * @num_consumers: Number of consumers
3279 * @consumers: Consumer data; clients are stored here.
3280 * @return 0 on success, an errno on failure
3282 * This convenience API allows consumers to disable multiple regulator
3283 * clients in a single API call. If any consumers cannot be disabled
3284 * then any others that were disabled will be enabled again prior to
3287 int regulator_bulk_disable(int num_consumers
,
3288 struct regulator_bulk_data
*consumers
)
3293 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3294 ret
= regulator_disable(consumers
[i
].consumer
);
3302 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3303 for (++i
; i
< num_consumers
; ++i
) {
3304 r
= regulator_enable(consumers
[i
].consumer
);
3306 pr_err("Failed to reename %s: %d\n",
3307 consumers
[i
].supply
, r
);
3312 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3315 * regulator_bulk_force_disable - force disable multiple regulator consumers
3317 * @num_consumers: Number of consumers
3318 * @consumers: Consumer data; clients are stored here.
3319 * @return 0 on success, an errno on failure
3321 * This convenience API allows consumers to forcibly disable multiple regulator
3322 * clients in a single API call.
3323 * NOTE: This should be used for situations when device damage will
3324 * likely occur if the regulators are not disabled (e.g. over temp).
3325 * Although regulator_force_disable function call for some consumers can
3326 * return error numbers, the function is called for all consumers.
3328 int regulator_bulk_force_disable(int num_consumers
,
3329 struct regulator_bulk_data
*consumers
)
3334 for (i
= 0; i
< num_consumers
; i
++)
3336 regulator_force_disable(consumers
[i
].consumer
);
3338 for (i
= 0; i
< num_consumers
; i
++) {
3339 if (consumers
[i
].ret
!= 0) {
3340 ret
= consumers
[i
].ret
;
3349 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3352 * regulator_bulk_free - free multiple regulator consumers
3354 * @num_consumers: Number of consumers
3355 * @consumers: Consumer data; clients are stored here.
3357 * This convenience API allows consumers to free multiple regulator
3358 * clients in a single API call.
3360 void regulator_bulk_free(int num_consumers
,
3361 struct regulator_bulk_data
*consumers
)
3365 for (i
= 0; i
< num_consumers
; i
++) {
3366 regulator_put(consumers
[i
].consumer
);
3367 consumers
[i
].consumer
= NULL
;
3370 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3373 * regulator_notifier_call_chain - call regulator event notifier
3374 * @rdev: regulator source
3375 * @event: notifier block
3376 * @data: callback-specific data.
3378 * Called by regulator drivers to notify clients a regulator event has
3379 * occurred. We also notify regulator clients downstream.
3380 * Note lock must be held by caller.
3382 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3383 unsigned long event
, void *data
)
3385 _notifier_call_chain(rdev
, event
, data
);
3389 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3392 * regulator_mode_to_status - convert a regulator mode into a status
3394 * @mode: Mode to convert
3396 * Convert a regulator mode into a status.
3398 int regulator_mode_to_status(unsigned int mode
)
3401 case REGULATOR_MODE_FAST
:
3402 return REGULATOR_STATUS_FAST
;
3403 case REGULATOR_MODE_NORMAL
:
3404 return REGULATOR_STATUS_NORMAL
;
3405 case REGULATOR_MODE_IDLE
:
3406 return REGULATOR_STATUS_IDLE
;
3407 case REGULATOR_MODE_STANDBY
:
3408 return REGULATOR_STATUS_STANDBY
;
3410 return REGULATOR_STATUS_UNDEFINED
;
3413 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3415 static struct attribute
*regulator_dev_attrs
[] = {
3416 &dev_attr_name
.attr
,
3417 &dev_attr_num_users
.attr
,
3418 &dev_attr_type
.attr
,
3419 &dev_attr_microvolts
.attr
,
3420 &dev_attr_microamps
.attr
,
3421 &dev_attr_opmode
.attr
,
3422 &dev_attr_state
.attr
,
3423 &dev_attr_status
.attr
,
3424 &dev_attr_bypass
.attr
,
3425 &dev_attr_requested_microamps
.attr
,
3426 &dev_attr_min_microvolts
.attr
,
3427 &dev_attr_max_microvolts
.attr
,
3428 &dev_attr_min_microamps
.attr
,
3429 &dev_attr_max_microamps
.attr
,
3430 &dev_attr_suspend_standby_state
.attr
,
3431 &dev_attr_suspend_mem_state
.attr
,
3432 &dev_attr_suspend_disk_state
.attr
,
3433 &dev_attr_suspend_standby_microvolts
.attr
,
3434 &dev_attr_suspend_mem_microvolts
.attr
,
3435 &dev_attr_suspend_disk_microvolts
.attr
,
3436 &dev_attr_suspend_standby_mode
.attr
,
3437 &dev_attr_suspend_mem_mode
.attr
,
3438 &dev_attr_suspend_disk_mode
.attr
,
3443 * To avoid cluttering sysfs (and memory) with useless state, only
3444 * create attributes that can be meaningfully displayed.
3446 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
3447 struct attribute
*attr
, int idx
)
3449 struct device
*dev
= kobj_to_dev(kobj
);
3450 struct regulator_dev
*rdev
= container_of(dev
, struct regulator_dev
, dev
);
3451 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3452 umode_t mode
= attr
->mode
;
3454 /* these three are always present */
3455 if (attr
== &dev_attr_name
.attr
||
3456 attr
== &dev_attr_num_users
.attr
||
3457 attr
== &dev_attr_type
.attr
)
3460 /* some attributes need specific methods to be displayed */
3461 if (attr
== &dev_attr_microvolts
.attr
) {
3462 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3463 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3464 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3465 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
3470 if (attr
== &dev_attr_microamps
.attr
)
3471 return ops
->get_current_limit
? mode
: 0;
3473 if (attr
== &dev_attr_opmode
.attr
)
3474 return ops
->get_mode
? mode
: 0;
3476 if (attr
== &dev_attr_state
.attr
)
3477 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
3479 if (attr
== &dev_attr_status
.attr
)
3480 return ops
->get_status
? mode
: 0;
3482 if (attr
== &dev_attr_bypass
.attr
)
3483 return ops
->get_bypass
? mode
: 0;
3485 /* some attributes are type-specific */
3486 if (attr
== &dev_attr_requested_microamps
.attr
)
3487 return rdev
->desc
->type
== REGULATOR_CURRENT
? mode
: 0;
3489 /* all the other attributes exist to support constraints;
3490 * don't show them if there are no constraints, or if the
3491 * relevant supporting methods are missing.
3493 if (!rdev
->constraints
)
3496 /* constraints need specific supporting methods */
3497 if (attr
== &dev_attr_min_microvolts
.attr
||
3498 attr
== &dev_attr_max_microvolts
.attr
)
3499 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
3501 if (attr
== &dev_attr_min_microamps
.attr
||
3502 attr
== &dev_attr_max_microamps
.attr
)
3503 return ops
->set_current_limit
? mode
: 0;
3505 if (attr
== &dev_attr_suspend_standby_state
.attr
||
3506 attr
== &dev_attr_suspend_mem_state
.attr
||
3507 attr
== &dev_attr_suspend_disk_state
.attr
)
3510 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
3511 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
3512 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
3513 return ops
->set_suspend_voltage
? mode
: 0;
3515 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
3516 attr
== &dev_attr_suspend_mem_mode
.attr
||
3517 attr
== &dev_attr_suspend_disk_mode
.attr
)
3518 return ops
->set_suspend_mode
? mode
: 0;
3523 static const struct attribute_group regulator_dev_group
= {
3524 .attrs
= regulator_dev_attrs
,
3525 .is_visible
= regulator_attr_is_visible
,
3528 static const struct attribute_group
*regulator_dev_groups
[] = {
3529 ®ulator_dev_group
,
3533 static void regulator_dev_release(struct device
*dev
)
3535 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
3539 static struct class regulator_class
= {
3540 .name
= "regulator",
3541 .dev_release
= regulator_dev_release
,
3542 .dev_groups
= regulator_dev_groups
,
3545 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3547 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3548 if (!rdev
->debugfs
) {
3549 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3553 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3555 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3557 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3558 &rdev
->bypass_count
);
3562 * regulator_register - register regulator
3563 * @regulator_desc: regulator to register
3564 * @cfg: runtime configuration for regulator
3566 * Called by regulator drivers to register a regulator.
3567 * Returns a valid pointer to struct regulator_dev on success
3568 * or an ERR_PTR() on error.
3570 struct regulator_dev
*
3571 regulator_register(const struct regulator_desc
*regulator_desc
,
3572 const struct regulator_config
*cfg
)
3574 const struct regulation_constraints
*constraints
= NULL
;
3575 const struct regulator_init_data
*init_data
;
3576 struct regulator_config
*config
= NULL
;
3577 static atomic_t regulator_no
= ATOMIC_INIT(-1);
3578 struct regulator_dev
*rdev
;
3581 const char *supply
= NULL
;
3583 if (regulator_desc
== NULL
|| cfg
== NULL
)
3584 return ERR_PTR(-EINVAL
);
3589 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3590 return ERR_PTR(-EINVAL
);
3592 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3593 regulator_desc
->type
!= REGULATOR_CURRENT
)
3594 return ERR_PTR(-EINVAL
);
3596 /* Only one of each should be implemented */
3597 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3598 regulator_desc
->ops
->get_voltage_sel
);
3599 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3600 regulator_desc
->ops
->set_voltage_sel
);
3602 /* If we're using selectors we must implement list_voltage. */
3603 if (regulator_desc
->ops
->get_voltage_sel
&&
3604 !regulator_desc
->ops
->list_voltage
) {
3605 return ERR_PTR(-EINVAL
);
3607 if (regulator_desc
->ops
->set_voltage_sel
&&
3608 !regulator_desc
->ops
->list_voltage
) {
3609 return ERR_PTR(-EINVAL
);
3612 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3614 return ERR_PTR(-ENOMEM
);
3617 * Duplicate the config so the driver could override it after
3618 * parsing init data.
3620 config
= kmemdup(cfg
, sizeof(*cfg
), GFP_KERNEL
);
3621 if (config
== NULL
) {
3623 return ERR_PTR(-ENOMEM
);
3626 init_data
= regulator_of_get_init_data(dev
, regulator_desc
, config
,
3627 &rdev
->dev
.of_node
);
3629 init_data
= config
->init_data
;
3630 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
3633 mutex_lock(®ulator_list_mutex
);
3635 mutex_init(&rdev
->mutex
);
3636 rdev
->reg_data
= config
->driver_data
;
3637 rdev
->owner
= regulator_desc
->owner
;
3638 rdev
->desc
= regulator_desc
;
3640 rdev
->regmap
= config
->regmap
;
3641 else if (dev_get_regmap(dev
, NULL
))
3642 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3643 else if (dev
->parent
)
3644 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3645 INIT_LIST_HEAD(&rdev
->consumer_list
);
3646 INIT_LIST_HEAD(&rdev
->list
);
3647 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3648 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3650 /* preform any regulator specific init */
3651 if (init_data
&& init_data
->regulator_init
) {
3652 ret
= init_data
->regulator_init(rdev
->reg_data
);
3657 /* register with sysfs */
3658 rdev
->dev
.class = ®ulator_class
;
3659 rdev
->dev
.parent
= dev
;
3660 dev_set_name(&rdev
->dev
, "regulator.%lu",
3661 (unsigned long) atomic_inc_return(®ulator_no
));
3662 ret
= device_register(&rdev
->dev
);
3664 put_device(&rdev
->dev
);
3668 dev_set_drvdata(&rdev
->dev
, rdev
);
3670 if ((config
->ena_gpio
|| config
->ena_gpio_initialized
) &&
3671 gpio_is_valid(config
->ena_gpio
)) {
3672 ret
= regulator_ena_gpio_request(rdev
, config
);
3674 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3675 config
->ena_gpio
, ret
);
3679 if (config
->ena_gpio_flags
& GPIOF_OUT_INIT_HIGH
)
3680 rdev
->ena_gpio_state
= 1;
3682 if (config
->ena_gpio_invert
)
3683 rdev
->ena_gpio_state
= !rdev
->ena_gpio_state
;
3686 /* set regulator constraints */
3688 constraints
= &init_data
->constraints
;
3690 ret
= set_machine_constraints(rdev
, constraints
);
3694 if (init_data
&& init_data
->supply_regulator
)
3695 supply
= init_data
->supply_regulator
;
3696 else if (regulator_desc
->supply_name
)
3697 supply
= regulator_desc
->supply_name
;
3700 struct regulator_dev
*r
;
3702 r
= regulator_dev_lookup(dev
, supply
, &ret
);
3704 if (ret
== -ENODEV
) {
3706 * No supply was specified for this regulator and
3707 * there will never be one.
3712 dev_err(dev
, "Failed to find supply %s\n", supply
);
3713 ret
= -EPROBE_DEFER
;
3717 ret
= set_supply(rdev
, r
);
3721 /* Enable supply if rail is enabled */
3722 if (_regulator_is_enabled(rdev
)) {
3723 ret
= regulator_enable(rdev
->supply
);
3730 /* add consumers devices */
3732 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3733 ret
= set_consumer_device_supply(rdev
,
3734 init_data
->consumer_supplies
[i
].dev_name
,
3735 init_data
->consumer_supplies
[i
].supply
);
3737 dev_err(dev
, "Failed to set supply %s\n",
3738 init_data
->consumer_supplies
[i
].supply
);
3739 goto unset_supplies
;
3744 list_add(&rdev
->list
, ®ulator_list
);
3746 rdev_init_debugfs(rdev
);
3748 mutex_unlock(®ulator_list_mutex
);
3753 unset_regulator_supplies(rdev
);
3757 _regulator_put(rdev
->supply
);
3758 regulator_ena_gpio_free(rdev
);
3759 kfree(rdev
->constraints
);
3761 device_unregister(&rdev
->dev
);
3762 /* device core frees rdev */
3763 rdev
= ERR_PTR(ret
);
3768 rdev
= ERR_PTR(ret
);
3771 EXPORT_SYMBOL_GPL(regulator_register
);
3774 * regulator_unregister - unregister regulator
3775 * @rdev: regulator to unregister
3777 * Called by regulator drivers to unregister a regulator.
3779 void regulator_unregister(struct regulator_dev
*rdev
)
3785 while (rdev
->use_count
--)
3786 regulator_disable(rdev
->supply
);
3787 regulator_put(rdev
->supply
);
3789 mutex_lock(®ulator_list_mutex
);
3790 debugfs_remove_recursive(rdev
->debugfs
);
3791 flush_work(&rdev
->disable_work
.work
);
3792 WARN_ON(rdev
->open_count
);
3793 unset_regulator_supplies(rdev
);
3794 list_del(&rdev
->list
);
3795 kfree(rdev
->constraints
);
3796 regulator_ena_gpio_free(rdev
);
3797 of_node_put(rdev
->dev
.of_node
);
3798 device_unregister(&rdev
->dev
);
3799 mutex_unlock(®ulator_list_mutex
);
3801 EXPORT_SYMBOL_GPL(regulator_unregister
);
3804 * regulator_suspend_prepare - prepare regulators for system wide suspend
3805 * @state: system suspend state
3807 * Configure each regulator with it's suspend operating parameters for state.
3808 * This will usually be called by machine suspend code prior to supending.
3810 int regulator_suspend_prepare(suspend_state_t state
)
3812 struct regulator_dev
*rdev
;
3815 /* ON is handled by regulator active state */
3816 if (state
== PM_SUSPEND_ON
)
3819 mutex_lock(®ulator_list_mutex
);
3820 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3822 mutex_lock(&rdev
->mutex
);
3823 ret
= suspend_prepare(rdev
, state
);
3824 mutex_unlock(&rdev
->mutex
);
3827 rdev_err(rdev
, "failed to prepare\n");
3832 mutex_unlock(®ulator_list_mutex
);
3835 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3838 * regulator_suspend_finish - resume regulators from system wide suspend
3840 * Turn on regulators that might be turned off by regulator_suspend_prepare
3841 * and that should be turned on according to the regulators properties.
3843 int regulator_suspend_finish(void)
3845 struct regulator_dev
*rdev
;
3848 mutex_lock(®ulator_list_mutex
);
3849 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3850 mutex_lock(&rdev
->mutex
);
3851 if (rdev
->use_count
> 0 || rdev
->constraints
->always_on
) {
3852 error
= _regulator_do_enable(rdev
);
3856 if (!have_full_constraints())
3858 if (!_regulator_is_enabled(rdev
))
3861 error
= _regulator_do_disable(rdev
);
3866 mutex_unlock(&rdev
->mutex
);
3868 mutex_unlock(®ulator_list_mutex
);
3871 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3874 * regulator_has_full_constraints - the system has fully specified constraints
3876 * Calling this function will cause the regulator API to disable all
3877 * regulators which have a zero use count and don't have an always_on
3878 * constraint in a late_initcall.
3880 * The intention is that this will become the default behaviour in a
3881 * future kernel release so users are encouraged to use this facility
3884 void regulator_has_full_constraints(void)
3886 has_full_constraints
= 1;
3888 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3891 * rdev_get_drvdata - get rdev regulator driver data
3894 * Get rdev regulator driver private data. This call can be used in the
3895 * regulator driver context.
3897 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3899 return rdev
->reg_data
;
3901 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3904 * regulator_get_drvdata - get regulator driver data
3905 * @regulator: regulator
3907 * Get regulator driver private data. This call can be used in the consumer
3908 * driver context when non API regulator specific functions need to be called.
3910 void *regulator_get_drvdata(struct regulator
*regulator
)
3912 return regulator
->rdev
->reg_data
;
3914 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3917 * regulator_set_drvdata - set regulator driver data
3918 * @regulator: regulator
3921 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3923 regulator
->rdev
->reg_data
= data
;
3925 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3928 * regulator_get_id - get regulator ID
3931 int rdev_get_id(struct regulator_dev
*rdev
)
3933 return rdev
->desc
->id
;
3935 EXPORT_SYMBOL_GPL(rdev_get_id
);
3937 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3941 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3943 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3945 return reg_init_data
->driver_data
;
3947 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3949 #ifdef CONFIG_DEBUG_FS
3950 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3951 size_t count
, loff_t
*ppos
)
3953 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3954 ssize_t len
, ret
= 0;
3955 struct regulator_map
*map
;
3960 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3961 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3963 rdev_get_name(map
->regulator
), map
->dev_name
,
3967 if (ret
> PAGE_SIZE
) {
3973 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3981 static const struct file_operations supply_map_fops
= {
3982 #ifdef CONFIG_DEBUG_FS
3983 .read
= supply_map_read_file
,
3984 .llseek
= default_llseek
,
3988 static int __init
regulator_init(void)
3992 ret
= class_register(®ulator_class
);
3994 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3996 pr_warn("regulator: Failed to create debugfs directory\n");
3998 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
4001 regulator_dummy_init();
4006 /* init early to allow our consumers to complete system booting */
4007 core_initcall(regulator_init
);
4009 static int __init
regulator_init_complete(void)
4011 struct regulator_dev
*rdev
;
4012 const struct regulator_ops
*ops
;
4013 struct regulation_constraints
*c
;
4017 * Since DT doesn't provide an idiomatic mechanism for
4018 * enabling full constraints and since it's much more natural
4019 * with DT to provide them just assume that a DT enabled
4020 * system has full constraints.
4022 if (of_have_populated_dt())
4023 has_full_constraints
= true;
4025 mutex_lock(®ulator_list_mutex
);
4027 /* If we have a full configuration then disable any regulators
4028 * we have permission to change the status for and which are
4029 * not in use or always_on. This is effectively the default
4030 * for DT and ACPI as they have full constraints.
4032 list_for_each_entry(rdev
, ®ulator_list
, list
) {
4033 ops
= rdev
->desc
->ops
;
4034 c
= rdev
->constraints
;
4036 if (c
&& c
->always_on
)
4039 if (c
&& !(c
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
))
4042 mutex_lock(&rdev
->mutex
);
4044 if (rdev
->use_count
)
4047 /* If we can't read the status assume it's on. */
4048 if (ops
->is_enabled
)
4049 enabled
= ops
->is_enabled(rdev
);
4056 if (have_full_constraints()) {
4057 /* We log since this may kill the system if it
4059 rdev_info(rdev
, "disabling\n");
4060 ret
= _regulator_do_disable(rdev
);
4062 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4064 /* The intention is that in future we will
4065 * assume that full constraints are provided
4066 * so warn even if we aren't going to do
4069 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4073 mutex_unlock(&rdev
->mutex
);
4076 mutex_unlock(®ulator_list_mutex
);
4080 late_initcall_sync(regulator_init_complete
);