2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
27 #include <linux/gpio/consumer.h>
29 #include <linux/regmap.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/module.h>
36 #define CREATE_TRACE_POINTS
37 #include <trace/events/regulator.h>
42 #define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 #define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
53 static DEFINE_MUTEX(regulator_list_mutex
);
54 static LIST_HEAD(regulator_list
);
55 static LIST_HEAD(regulator_map_list
);
56 static LIST_HEAD(regulator_ena_gpio_list
);
57 static LIST_HEAD(regulator_supply_alias_list
);
58 static bool has_full_constraints
;
60 static struct dentry
*debugfs_root
;
63 * struct regulator_map
65 * Used to provide symbolic supply names to devices.
67 struct regulator_map
{
68 struct list_head list
;
69 const char *dev_name
; /* The dev_name() for the consumer */
71 struct regulator_dev
*regulator
;
75 * struct regulator_enable_gpio
77 * Management for shared enable GPIO pin
79 struct regulator_enable_gpio
{
80 struct list_head list
;
81 struct gpio_desc
*gpiod
;
82 u32 enable_count
; /* a number of enabled shared GPIO */
83 u32 request_count
; /* a number of requested shared GPIO */
84 unsigned int ena_gpio_invert
:1;
88 * struct regulator_supply_alias
90 * Used to map lookups for a supply onto an alternative device.
92 struct regulator_supply_alias
{
93 struct list_head list
;
94 struct device
*src_dev
;
95 const char *src_supply
;
96 struct device
*alias_dev
;
97 const char *alias_supply
;
100 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
101 static int _regulator_disable(struct regulator_dev
*rdev
);
102 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
103 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
104 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
105 static int _notifier_call_chain(struct regulator_dev
*rdev
,
106 unsigned long event
, void *data
);
107 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
108 int min_uV
, int max_uV
);
109 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
111 const char *supply_name
);
113 static const char *rdev_get_name(struct regulator_dev
*rdev
)
115 if (rdev
->constraints
&& rdev
->constraints
->name
)
116 return rdev
->constraints
->name
;
117 else if (rdev
->desc
->name
)
118 return rdev
->desc
->name
;
123 static bool have_full_constraints(void)
125 return has_full_constraints
|| of_have_populated_dt();
129 * of_get_regulator - get a regulator device node based on supply name
130 * @dev: Device pointer for the consumer (of regulator) device
131 * @supply: regulator supply name
133 * Extract the regulator device node corresponding to the supply name.
134 * returns the device node corresponding to the regulator if found, else
137 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
139 struct device_node
*regnode
= NULL
;
140 char prop_name
[32]; /* 32 is max size of property name */
142 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
144 snprintf(prop_name
, 32, "%s-supply", supply
);
145 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
148 dev_dbg(dev
, "Looking up %s property in node %s failed",
149 prop_name
, dev
->of_node
->full_name
);
155 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
157 if (!rdev
->constraints
)
160 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
166 /* Platform voltage constraint check */
167 static int regulator_check_voltage(struct regulator_dev
*rdev
,
168 int *min_uV
, int *max_uV
)
170 BUG_ON(*min_uV
> *max_uV
);
172 if (!rdev
->constraints
) {
173 rdev_err(rdev
, "no constraints\n");
176 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
177 rdev_err(rdev
, "operation not allowed\n");
181 if (*max_uV
> rdev
->constraints
->max_uV
)
182 *max_uV
= rdev
->constraints
->max_uV
;
183 if (*min_uV
< rdev
->constraints
->min_uV
)
184 *min_uV
= rdev
->constraints
->min_uV
;
186 if (*min_uV
> *max_uV
) {
187 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
195 /* Make sure we select a voltage that suits the needs of all
196 * regulator consumers
198 static int regulator_check_consumers(struct regulator_dev
*rdev
,
199 int *min_uV
, int *max_uV
)
201 struct regulator
*regulator
;
203 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
205 * Assume consumers that didn't say anything are OK
206 * with anything in the constraint range.
208 if (!regulator
->min_uV
&& !regulator
->max_uV
)
211 if (*max_uV
> regulator
->max_uV
)
212 *max_uV
= regulator
->max_uV
;
213 if (*min_uV
< regulator
->min_uV
)
214 *min_uV
= regulator
->min_uV
;
217 if (*min_uV
> *max_uV
) {
218 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
226 /* current constraint check */
227 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
228 int *min_uA
, int *max_uA
)
230 BUG_ON(*min_uA
> *max_uA
);
232 if (!rdev
->constraints
) {
233 rdev_err(rdev
, "no constraints\n");
236 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
237 rdev_err(rdev
, "operation not allowed\n");
241 if (*max_uA
> rdev
->constraints
->max_uA
)
242 *max_uA
= rdev
->constraints
->max_uA
;
243 if (*min_uA
< rdev
->constraints
->min_uA
)
244 *min_uA
= rdev
->constraints
->min_uA
;
246 if (*min_uA
> *max_uA
) {
247 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
255 /* operating mode constraint check */
256 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
259 case REGULATOR_MODE_FAST
:
260 case REGULATOR_MODE_NORMAL
:
261 case REGULATOR_MODE_IDLE
:
262 case REGULATOR_MODE_STANDBY
:
265 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
269 if (!rdev
->constraints
) {
270 rdev_err(rdev
, "no constraints\n");
273 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
274 rdev_err(rdev
, "operation not allowed\n");
278 /* The modes are bitmasks, the most power hungry modes having
279 * the lowest values. If the requested mode isn't supported
280 * try higher modes. */
282 if (rdev
->constraints
->valid_modes_mask
& *mode
)
290 /* dynamic regulator mode switching constraint check */
291 static int regulator_check_drms(struct regulator_dev
*rdev
)
293 if (!rdev
->constraints
) {
294 rdev_err(rdev
, "no constraints\n");
297 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
298 rdev_err(rdev
, "operation not allowed\n");
304 static ssize_t
regulator_uV_show(struct device
*dev
,
305 struct device_attribute
*attr
, char *buf
)
307 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
310 mutex_lock(&rdev
->mutex
);
311 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
312 mutex_unlock(&rdev
->mutex
);
316 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
318 static ssize_t
regulator_uA_show(struct device
*dev
,
319 struct device_attribute
*attr
, char *buf
)
321 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
323 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
325 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
327 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
330 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
332 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
334 static DEVICE_ATTR_RO(name
);
336 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
339 case REGULATOR_MODE_FAST
:
340 return sprintf(buf
, "fast\n");
341 case REGULATOR_MODE_NORMAL
:
342 return sprintf(buf
, "normal\n");
343 case REGULATOR_MODE_IDLE
:
344 return sprintf(buf
, "idle\n");
345 case REGULATOR_MODE_STANDBY
:
346 return sprintf(buf
, "standby\n");
348 return sprintf(buf
, "unknown\n");
351 static ssize_t
regulator_opmode_show(struct device
*dev
,
352 struct device_attribute
*attr
, char *buf
)
354 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
356 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
358 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
360 static ssize_t
regulator_print_state(char *buf
, int state
)
363 return sprintf(buf
, "enabled\n");
365 return sprintf(buf
, "disabled\n");
367 return sprintf(buf
, "unknown\n");
370 static ssize_t
regulator_state_show(struct device
*dev
,
371 struct device_attribute
*attr
, char *buf
)
373 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
376 mutex_lock(&rdev
->mutex
);
377 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
378 mutex_unlock(&rdev
->mutex
);
382 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
384 static ssize_t
regulator_status_show(struct device
*dev
,
385 struct device_attribute
*attr
, char *buf
)
387 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
391 status
= rdev
->desc
->ops
->get_status(rdev
);
396 case REGULATOR_STATUS_OFF
:
399 case REGULATOR_STATUS_ON
:
402 case REGULATOR_STATUS_ERROR
:
405 case REGULATOR_STATUS_FAST
:
408 case REGULATOR_STATUS_NORMAL
:
411 case REGULATOR_STATUS_IDLE
:
414 case REGULATOR_STATUS_STANDBY
:
417 case REGULATOR_STATUS_BYPASS
:
420 case REGULATOR_STATUS_UNDEFINED
:
427 return sprintf(buf
, "%s\n", label
);
429 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
431 static ssize_t
regulator_min_uA_show(struct device
*dev
,
432 struct device_attribute
*attr
, char *buf
)
434 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
436 if (!rdev
->constraints
)
437 return sprintf(buf
, "constraint not defined\n");
439 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
441 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
443 static ssize_t
regulator_max_uA_show(struct device
*dev
,
444 struct device_attribute
*attr
, char *buf
)
446 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
448 if (!rdev
->constraints
)
449 return sprintf(buf
, "constraint not defined\n");
451 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
453 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
455 static ssize_t
regulator_min_uV_show(struct device
*dev
,
456 struct device_attribute
*attr
, char *buf
)
458 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
460 if (!rdev
->constraints
)
461 return sprintf(buf
, "constraint not defined\n");
463 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
465 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
467 static ssize_t
regulator_max_uV_show(struct device
*dev
,
468 struct device_attribute
*attr
, char *buf
)
470 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
472 if (!rdev
->constraints
)
473 return sprintf(buf
, "constraint not defined\n");
475 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
477 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
479 static ssize_t
regulator_total_uA_show(struct device
*dev
,
480 struct device_attribute
*attr
, char *buf
)
482 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
483 struct regulator
*regulator
;
486 mutex_lock(&rdev
->mutex
);
487 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
488 uA
+= regulator
->uA_load
;
489 mutex_unlock(&rdev
->mutex
);
490 return sprintf(buf
, "%d\n", uA
);
492 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
494 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
497 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
498 return sprintf(buf
, "%d\n", rdev
->use_count
);
500 static DEVICE_ATTR_RO(num_users
);
502 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
505 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
507 switch (rdev
->desc
->type
) {
508 case REGULATOR_VOLTAGE
:
509 return sprintf(buf
, "voltage\n");
510 case REGULATOR_CURRENT
:
511 return sprintf(buf
, "current\n");
513 return sprintf(buf
, "unknown\n");
515 static DEVICE_ATTR_RO(type
);
517 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
518 struct device_attribute
*attr
, char *buf
)
520 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
522 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
524 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
525 regulator_suspend_mem_uV_show
, NULL
);
527 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
528 struct device_attribute
*attr
, char *buf
)
530 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
532 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
534 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
535 regulator_suspend_disk_uV_show
, NULL
);
537 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
538 struct device_attribute
*attr
, char *buf
)
540 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
542 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
544 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
545 regulator_suspend_standby_uV_show
, NULL
);
547 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
548 struct device_attribute
*attr
, char *buf
)
550 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
552 return regulator_print_opmode(buf
,
553 rdev
->constraints
->state_mem
.mode
);
555 static DEVICE_ATTR(suspend_mem_mode
, 0444,
556 regulator_suspend_mem_mode_show
, NULL
);
558 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
559 struct device_attribute
*attr
, char *buf
)
561 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
563 return regulator_print_opmode(buf
,
564 rdev
->constraints
->state_disk
.mode
);
566 static DEVICE_ATTR(suspend_disk_mode
, 0444,
567 regulator_suspend_disk_mode_show
, NULL
);
569 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
570 struct device_attribute
*attr
, char *buf
)
572 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
574 return regulator_print_opmode(buf
,
575 rdev
->constraints
->state_standby
.mode
);
577 static DEVICE_ATTR(suspend_standby_mode
, 0444,
578 regulator_suspend_standby_mode_show
, NULL
);
580 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
581 struct device_attribute
*attr
, char *buf
)
583 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
585 return regulator_print_state(buf
,
586 rdev
->constraints
->state_mem
.enabled
);
588 static DEVICE_ATTR(suspend_mem_state
, 0444,
589 regulator_suspend_mem_state_show
, NULL
);
591 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
592 struct device_attribute
*attr
, char *buf
)
594 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
596 return regulator_print_state(buf
,
597 rdev
->constraints
->state_disk
.enabled
);
599 static DEVICE_ATTR(suspend_disk_state
, 0444,
600 regulator_suspend_disk_state_show
, NULL
);
602 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
603 struct device_attribute
*attr
, char *buf
)
605 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
607 return regulator_print_state(buf
,
608 rdev
->constraints
->state_standby
.enabled
);
610 static DEVICE_ATTR(suspend_standby_state
, 0444,
611 regulator_suspend_standby_state_show
, NULL
);
613 static ssize_t
regulator_bypass_show(struct device
*dev
,
614 struct device_attribute
*attr
, char *buf
)
616 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
621 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
630 return sprintf(buf
, "%s\n", report
);
632 static DEVICE_ATTR(bypass
, 0444,
633 regulator_bypass_show
, NULL
);
635 /* Calculate the new optimum regulator operating mode based on the new total
636 * consumer load. All locks held by caller */
637 static int drms_uA_update(struct regulator_dev
*rdev
)
639 struct regulator
*sibling
;
640 int current_uA
= 0, output_uV
, input_uV
, err
;
644 * first check to see if we can set modes at all, otherwise just
645 * tell the consumer everything is OK.
647 err
= regulator_check_drms(rdev
);
651 if (!rdev
->desc
->ops
->get_optimum_mode
)
654 if (!rdev
->desc
->ops
->set_mode
)
657 /* get output voltage */
658 output_uV
= _regulator_get_voltage(rdev
);
659 if (output_uV
<= 0) {
660 rdev_err(rdev
, "invalid output voltage found\n");
664 /* get input voltage */
667 input_uV
= regulator_get_voltage(rdev
->supply
);
669 input_uV
= rdev
->constraints
->input_uV
;
671 rdev_err(rdev
, "invalid input voltage found\n");
675 /* calc total requested load */
676 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
677 current_uA
+= sibling
->uA_load
;
679 /* now get the optimum mode for our new total regulator load */
680 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
681 output_uV
, current_uA
);
683 /* check the new mode is allowed */
684 err
= regulator_mode_constrain(rdev
, &mode
);
686 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
687 current_uA
, input_uV
, output_uV
);
691 err
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
693 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
698 static int suspend_set_state(struct regulator_dev
*rdev
,
699 struct regulator_state
*rstate
)
703 /* If we have no suspend mode configration don't set anything;
704 * only warn if the driver implements set_suspend_voltage or
705 * set_suspend_mode callback.
707 if (!rstate
->enabled
&& !rstate
->disabled
) {
708 if (rdev
->desc
->ops
->set_suspend_voltage
||
709 rdev
->desc
->ops
->set_suspend_mode
)
710 rdev_warn(rdev
, "No configuration\n");
714 if (rstate
->enabled
&& rstate
->disabled
) {
715 rdev_err(rdev
, "invalid configuration\n");
719 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
720 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
721 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
722 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
723 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
727 rdev_err(rdev
, "failed to enabled/disable\n");
731 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
732 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
734 rdev_err(rdev
, "failed to set voltage\n");
739 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
740 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
742 rdev_err(rdev
, "failed to set mode\n");
749 /* locks held by caller */
750 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
752 if (!rdev
->constraints
)
756 case PM_SUSPEND_STANDBY
:
757 return suspend_set_state(rdev
,
758 &rdev
->constraints
->state_standby
);
760 return suspend_set_state(rdev
,
761 &rdev
->constraints
->state_mem
);
763 return suspend_set_state(rdev
,
764 &rdev
->constraints
->state_disk
);
770 static void print_constraints(struct regulator_dev
*rdev
)
772 struct regulation_constraints
*constraints
= rdev
->constraints
;
777 if (constraints
->min_uV
&& constraints
->max_uV
) {
778 if (constraints
->min_uV
== constraints
->max_uV
)
779 count
+= sprintf(buf
+ count
, "%d mV ",
780 constraints
->min_uV
/ 1000);
782 count
+= sprintf(buf
+ count
, "%d <--> %d mV ",
783 constraints
->min_uV
/ 1000,
784 constraints
->max_uV
/ 1000);
787 if (!constraints
->min_uV
||
788 constraints
->min_uV
!= constraints
->max_uV
) {
789 ret
= _regulator_get_voltage(rdev
);
791 count
+= sprintf(buf
+ count
, "at %d mV ", ret
/ 1000);
794 if (constraints
->uV_offset
)
795 count
+= sprintf(buf
, "%dmV offset ",
796 constraints
->uV_offset
/ 1000);
798 if (constraints
->min_uA
&& constraints
->max_uA
) {
799 if (constraints
->min_uA
== constraints
->max_uA
)
800 count
+= sprintf(buf
+ count
, "%d mA ",
801 constraints
->min_uA
/ 1000);
803 count
+= sprintf(buf
+ count
, "%d <--> %d mA ",
804 constraints
->min_uA
/ 1000,
805 constraints
->max_uA
/ 1000);
808 if (!constraints
->min_uA
||
809 constraints
->min_uA
!= constraints
->max_uA
) {
810 ret
= _regulator_get_current_limit(rdev
);
812 count
+= sprintf(buf
+ count
, "at %d mA ", ret
/ 1000);
815 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
816 count
+= sprintf(buf
+ count
, "fast ");
817 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
818 count
+= sprintf(buf
+ count
, "normal ");
819 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
820 count
+= sprintf(buf
+ count
, "idle ");
821 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
822 count
+= sprintf(buf
+ count
, "standby");
825 sprintf(buf
, "no parameters");
827 rdev_dbg(rdev
, "%s\n", buf
);
829 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
830 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
832 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
835 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
836 struct regulation_constraints
*constraints
)
838 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
841 /* do we need to apply the constraint voltage */
842 if (rdev
->constraints
->apply_uV
&&
843 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
844 int current_uV
= _regulator_get_voltage(rdev
);
845 if (current_uV
< 0) {
847 "failed to get the current voltage(%d)\n",
851 if (current_uV
< rdev
->constraints
->min_uV
||
852 current_uV
> rdev
->constraints
->max_uV
) {
853 ret
= _regulator_do_set_voltage(
854 rdev
, rdev
->constraints
->min_uV
,
855 rdev
->constraints
->max_uV
);
858 "failed to apply %duV constraint(%d)\n",
859 rdev
->constraints
->min_uV
, ret
);
865 /* constrain machine-level voltage specs to fit
866 * the actual range supported by this regulator.
868 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
869 int count
= rdev
->desc
->n_voltages
;
871 int min_uV
= INT_MAX
;
872 int max_uV
= INT_MIN
;
873 int cmin
= constraints
->min_uV
;
874 int cmax
= constraints
->max_uV
;
876 /* it's safe to autoconfigure fixed-voltage supplies
877 and the constraints are used by list_voltage. */
878 if (count
== 1 && !cmin
) {
881 constraints
->min_uV
= cmin
;
882 constraints
->max_uV
= cmax
;
885 /* voltage constraints are optional */
886 if ((cmin
== 0) && (cmax
== 0))
889 /* else require explicit machine-level constraints */
890 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
891 rdev_err(rdev
, "invalid voltage constraints\n");
895 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
896 for (i
= 0; i
< count
; i
++) {
899 value
= ops
->list_voltage(rdev
, i
);
903 /* maybe adjust [min_uV..max_uV] */
904 if (value
>= cmin
&& value
< min_uV
)
906 if (value
<= cmax
&& value
> max_uV
)
910 /* final: [min_uV..max_uV] valid iff constraints valid */
911 if (max_uV
< min_uV
) {
913 "unsupportable voltage constraints %u-%uuV\n",
918 /* use regulator's subset of machine constraints */
919 if (constraints
->min_uV
< min_uV
) {
920 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
921 constraints
->min_uV
, min_uV
);
922 constraints
->min_uV
= min_uV
;
924 if (constraints
->max_uV
> max_uV
) {
925 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
926 constraints
->max_uV
, max_uV
);
927 constraints
->max_uV
= max_uV
;
934 static int machine_constraints_current(struct regulator_dev
*rdev
,
935 struct regulation_constraints
*constraints
)
937 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
940 if (!constraints
->min_uA
&& !constraints
->max_uA
)
943 if (constraints
->min_uA
> constraints
->max_uA
) {
944 rdev_err(rdev
, "Invalid current constraints\n");
948 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
949 rdev_warn(rdev
, "Operation of current configuration missing\n");
953 /* Set regulator current in constraints range */
954 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
955 constraints
->max_uA
);
957 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
964 static int _regulator_do_enable(struct regulator_dev
*rdev
);
967 * set_machine_constraints - sets regulator constraints
968 * @rdev: regulator source
969 * @constraints: constraints to apply
971 * Allows platform initialisation code to define and constrain
972 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
973 * Constraints *must* be set by platform code in order for some
974 * regulator operations to proceed i.e. set_voltage, set_current_limit,
977 static int set_machine_constraints(struct regulator_dev
*rdev
,
978 const struct regulation_constraints
*constraints
)
981 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
984 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
987 rdev
->constraints
= kzalloc(sizeof(*constraints
),
989 if (!rdev
->constraints
)
992 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
996 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
1000 /* do we need to setup our suspend state */
1001 if (rdev
->constraints
->initial_state
) {
1002 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
1004 rdev_err(rdev
, "failed to set suspend state\n");
1009 if (rdev
->constraints
->initial_mode
) {
1010 if (!ops
->set_mode
) {
1011 rdev_err(rdev
, "no set_mode operation\n");
1016 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1018 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1023 /* If the constraints say the regulator should be on at this point
1024 * and we have control then make sure it is enabled.
1026 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
1027 ret
= _regulator_do_enable(rdev
);
1028 if (ret
< 0 && ret
!= -EINVAL
) {
1029 rdev_err(rdev
, "failed to enable\n");
1034 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1035 && ops
->set_ramp_delay
) {
1036 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1038 rdev_err(rdev
, "failed to set ramp_delay\n");
1043 print_constraints(rdev
);
1046 kfree(rdev
->constraints
);
1047 rdev
->constraints
= NULL
;
1052 * set_supply - set regulator supply regulator
1053 * @rdev: regulator name
1054 * @supply_rdev: supply regulator name
1056 * Called by platform initialisation code to set the supply regulator for this
1057 * regulator. This ensures that a regulators supply will also be enabled by the
1058 * core if it's child is enabled.
1060 static int set_supply(struct regulator_dev
*rdev
,
1061 struct regulator_dev
*supply_rdev
)
1065 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1067 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1068 if (rdev
->supply
== NULL
) {
1072 supply_rdev
->open_count
++;
1078 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1079 * @rdev: regulator source
1080 * @consumer_dev_name: dev_name() string for device supply applies to
1081 * @supply: symbolic name for supply
1083 * Allows platform initialisation code to map physical regulator
1084 * sources to symbolic names for supplies for use by devices. Devices
1085 * should use these symbolic names to request regulators, avoiding the
1086 * need to provide board-specific regulator names as platform data.
1088 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1089 const char *consumer_dev_name
,
1092 struct regulator_map
*node
;
1098 if (consumer_dev_name
!= NULL
)
1103 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1104 if (node
->dev_name
&& consumer_dev_name
) {
1105 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1107 } else if (node
->dev_name
|| consumer_dev_name
) {
1111 if (strcmp(node
->supply
, supply
) != 0)
1114 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1116 dev_name(&node
->regulator
->dev
),
1117 node
->regulator
->desc
->name
,
1119 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1123 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1127 node
->regulator
= rdev
;
1128 node
->supply
= supply
;
1131 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1132 if (node
->dev_name
== NULL
) {
1138 list_add(&node
->list
, ®ulator_map_list
);
1142 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1144 struct regulator_map
*node
, *n
;
1146 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1147 if (rdev
== node
->regulator
) {
1148 list_del(&node
->list
);
1149 kfree(node
->dev_name
);
1155 #define REG_STR_SIZE 64
1157 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1159 const char *supply_name
)
1161 struct regulator
*regulator
;
1162 char buf
[REG_STR_SIZE
];
1165 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1166 if (regulator
== NULL
)
1169 mutex_lock(&rdev
->mutex
);
1170 regulator
->rdev
= rdev
;
1171 list_add(®ulator
->list
, &rdev
->consumer_list
);
1174 regulator
->dev
= dev
;
1176 /* Add a link to the device sysfs entry */
1177 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1178 dev
->kobj
.name
, supply_name
);
1179 if (size
>= REG_STR_SIZE
)
1182 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1183 if (regulator
->supply_name
== NULL
)
1186 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1189 rdev_warn(rdev
, "could not add device link %s err %d\n",
1190 dev
->kobj
.name
, err
);
1194 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1195 if (regulator
->supply_name
== NULL
)
1199 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1201 if (!regulator
->debugfs
) {
1202 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1204 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1205 ®ulator
->uA_load
);
1206 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1207 ®ulator
->min_uV
);
1208 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1209 ®ulator
->max_uV
);
1213 * Check now if the regulator is an always on regulator - if
1214 * it is then we don't need to do nearly so much work for
1215 * enable/disable calls.
1217 if (!_regulator_can_change_status(rdev
) &&
1218 _regulator_is_enabled(rdev
))
1219 regulator
->always_on
= true;
1221 mutex_unlock(&rdev
->mutex
);
1224 list_del(®ulator
->list
);
1226 mutex_unlock(&rdev
->mutex
);
1230 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1232 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1233 return rdev
->constraints
->enable_time
;
1234 if (!rdev
->desc
->ops
->enable_time
)
1235 return rdev
->desc
->enable_time
;
1236 return rdev
->desc
->ops
->enable_time(rdev
);
1239 static struct regulator_supply_alias
*regulator_find_supply_alias(
1240 struct device
*dev
, const char *supply
)
1242 struct regulator_supply_alias
*map
;
1244 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1245 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1251 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1253 struct regulator_supply_alias
*map
;
1255 map
= regulator_find_supply_alias(*dev
, *supply
);
1257 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1258 *supply
, map
->alias_supply
,
1259 dev_name(map
->alias_dev
));
1260 *dev
= map
->alias_dev
;
1261 *supply
= map
->alias_supply
;
1265 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1269 struct regulator_dev
*r
;
1270 struct device_node
*node
;
1271 struct regulator_map
*map
;
1272 const char *devname
= NULL
;
1274 regulator_supply_alias(&dev
, &supply
);
1276 /* first do a dt based lookup */
1277 if (dev
&& dev
->of_node
) {
1278 node
= of_get_regulator(dev
, supply
);
1280 list_for_each_entry(r
, ®ulator_list
, list
)
1281 if (r
->dev
.parent
&&
1282 node
== r
->dev
.of_node
)
1284 *ret
= -EPROBE_DEFER
;
1288 * If we couldn't even get the node then it's
1289 * not just that the device didn't register
1290 * yet, there's no node and we'll never
1297 /* if not found, try doing it non-dt way */
1299 devname
= dev_name(dev
);
1301 list_for_each_entry(r
, ®ulator_list
, list
)
1302 if (strcmp(rdev_get_name(r
), supply
) == 0)
1305 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1306 /* If the mapping has a device set up it must match */
1307 if (map
->dev_name
&&
1308 (!devname
|| strcmp(map
->dev_name
, devname
)))
1311 if (strcmp(map
->supply
, supply
) == 0)
1312 return map
->regulator
;
1319 /* Internal regulator request function */
1320 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1321 bool exclusive
, bool allow_dummy
)
1323 struct regulator_dev
*rdev
;
1324 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1325 const char *devname
= NULL
;
1329 pr_err("get() with no identifier\n");
1330 return ERR_PTR(-EINVAL
);
1334 devname
= dev_name(dev
);
1336 if (have_full_constraints())
1339 ret
= -EPROBE_DEFER
;
1341 mutex_lock(®ulator_list_mutex
);
1343 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1347 regulator
= ERR_PTR(ret
);
1350 * If we have return value from dev_lookup fail, we do not expect to
1351 * succeed, so, quit with appropriate error value
1353 if (ret
&& ret
!= -ENODEV
)
1357 devname
= "deviceless";
1360 * Assume that a regulator is physically present and enabled
1361 * even if it isn't hooked up and just provide a dummy.
1363 if (have_full_constraints() && allow_dummy
) {
1364 pr_warn("%s supply %s not found, using dummy regulator\n",
1367 rdev
= dummy_regulator_rdev
;
1369 /* Don't log an error when called from regulator_get_optional() */
1370 } else if (!have_full_constraints() || exclusive
) {
1371 dev_warn(dev
, "dummy supplies not allowed\n");
1374 mutex_unlock(®ulator_list_mutex
);
1378 if (rdev
->exclusive
) {
1379 regulator
= ERR_PTR(-EPERM
);
1383 if (exclusive
&& rdev
->open_count
) {
1384 regulator
= ERR_PTR(-EBUSY
);
1388 if (!try_module_get(rdev
->owner
))
1391 regulator
= create_regulator(rdev
, dev
, id
);
1392 if (regulator
== NULL
) {
1393 regulator
= ERR_PTR(-ENOMEM
);
1394 module_put(rdev
->owner
);
1400 rdev
->exclusive
= 1;
1402 ret
= _regulator_is_enabled(rdev
);
1404 rdev
->use_count
= 1;
1406 rdev
->use_count
= 0;
1410 mutex_unlock(®ulator_list_mutex
);
1416 * regulator_get - lookup and obtain a reference to a regulator.
1417 * @dev: device for regulator "consumer"
1418 * @id: Supply name or regulator ID.
1420 * Returns a struct regulator corresponding to the regulator producer,
1421 * or IS_ERR() condition containing errno.
1423 * Use of supply names configured via regulator_set_device_supply() is
1424 * strongly encouraged. It is recommended that the supply name used
1425 * should match the name used for the supply and/or the relevant
1426 * device pins in the datasheet.
1428 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1430 return _regulator_get(dev
, id
, false, true);
1432 EXPORT_SYMBOL_GPL(regulator_get
);
1435 * regulator_get_exclusive - obtain exclusive access to a regulator.
1436 * @dev: device for regulator "consumer"
1437 * @id: Supply name or regulator ID.
1439 * Returns a struct regulator corresponding to the regulator producer,
1440 * or IS_ERR() condition containing errno. Other consumers will be
1441 * unable to obtain this regulator while this reference is held and the
1442 * use count for the regulator will be initialised to reflect the current
1443 * state of the regulator.
1445 * This is intended for use by consumers which cannot tolerate shared
1446 * use of the regulator such as those which need to force the
1447 * regulator off for correct operation of the hardware they are
1450 * Use of supply names configured via regulator_set_device_supply() is
1451 * strongly encouraged. It is recommended that the supply name used
1452 * should match the name used for the supply and/or the relevant
1453 * device pins in the datasheet.
1455 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1457 return _regulator_get(dev
, id
, true, false);
1459 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1462 * regulator_get_optional - obtain optional access to a regulator.
1463 * @dev: device for regulator "consumer"
1464 * @id: Supply name or regulator ID.
1466 * Returns a struct regulator corresponding to the regulator producer,
1467 * or IS_ERR() condition containing errno.
1469 * This is intended for use by consumers for devices which can have
1470 * some supplies unconnected in normal use, such as some MMC devices.
1471 * It can allow the regulator core to provide stub supplies for other
1472 * supplies requested using normal regulator_get() calls without
1473 * disrupting the operation of drivers that can handle absent
1476 * Use of supply names configured via regulator_set_device_supply() is
1477 * strongly encouraged. It is recommended that the supply name used
1478 * should match the name used for the supply and/or the relevant
1479 * device pins in the datasheet.
1481 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1483 return _regulator_get(dev
, id
, false, false);
1485 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1487 /* regulator_list_mutex lock held by regulator_put() */
1488 static void _regulator_put(struct regulator
*regulator
)
1490 struct regulator_dev
*rdev
;
1492 if (regulator
== NULL
|| IS_ERR(regulator
))
1495 rdev
= regulator
->rdev
;
1497 debugfs_remove_recursive(regulator
->debugfs
);
1499 /* remove any sysfs entries */
1501 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1502 mutex_lock(&rdev
->mutex
);
1503 kfree(regulator
->supply_name
);
1504 list_del(®ulator
->list
);
1508 rdev
->exclusive
= 0;
1509 mutex_unlock(&rdev
->mutex
);
1511 module_put(rdev
->owner
);
1515 * regulator_put - "free" the regulator source
1516 * @regulator: regulator source
1518 * Note: drivers must ensure that all regulator_enable calls made on this
1519 * regulator source are balanced by regulator_disable calls prior to calling
1522 void regulator_put(struct regulator
*regulator
)
1524 mutex_lock(®ulator_list_mutex
);
1525 _regulator_put(regulator
);
1526 mutex_unlock(®ulator_list_mutex
);
1528 EXPORT_SYMBOL_GPL(regulator_put
);
1531 * regulator_register_supply_alias - Provide device alias for supply lookup
1533 * @dev: device that will be given as the regulator "consumer"
1534 * @id: Supply name or regulator ID
1535 * @alias_dev: device that should be used to lookup the supply
1536 * @alias_id: Supply name or regulator ID that should be used to lookup the
1539 * All lookups for id on dev will instead be conducted for alias_id on
1542 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1543 struct device
*alias_dev
,
1544 const char *alias_id
)
1546 struct regulator_supply_alias
*map
;
1548 map
= regulator_find_supply_alias(dev
, id
);
1552 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1557 map
->src_supply
= id
;
1558 map
->alias_dev
= alias_dev
;
1559 map
->alias_supply
= alias_id
;
1561 list_add(&map
->list
, ®ulator_supply_alias_list
);
1563 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1564 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1568 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1571 * regulator_unregister_supply_alias - Remove device alias
1573 * @dev: device that will be given as the regulator "consumer"
1574 * @id: Supply name or regulator ID
1576 * Remove a lookup alias if one exists for id on dev.
1578 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1580 struct regulator_supply_alias
*map
;
1582 map
= regulator_find_supply_alias(dev
, id
);
1584 list_del(&map
->list
);
1588 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1591 * regulator_bulk_register_supply_alias - register multiple aliases
1593 * @dev: device that will be given as the regulator "consumer"
1594 * @id: List of supply names or regulator IDs
1595 * @alias_dev: device that should be used to lookup the supply
1596 * @alias_id: List of supply names or regulator IDs that should be used to
1598 * @num_id: Number of aliases to register
1600 * @return 0 on success, an errno on failure.
1602 * This helper function allows drivers to register several supply
1603 * aliases in one operation. If any of the aliases cannot be
1604 * registered any aliases that were registered will be removed
1605 * before returning to the caller.
1607 int regulator_bulk_register_supply_alias(struct device
*dev
,
1608 const char *const *id
,
1609 struct device
*alias_dev
,
1610 const char *const *alias_id
,
1616 for (i
= 0; i
< num_id
; ++i
) {
1617 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1627 "Failed to create supply alias %s,%s -> %s,%s\n",
1628 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1631 regulator_unregister_supply_alias(dev
, id
[i
]);
1635 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1638 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1640 * @dev: device that will be given as the regulator "consumer"
1641 * @id: List of supply names or regulator IDs
1642 * @num_id: Number of aliases to unregister
1644 * This helper function allows drivers to unregister several supply
1645 * aliases in one operation.
1647 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1648 const char *const *id
,
1653 for (i
= 0; i
< num_id
; ++i
)
1654 regulator_unregister_supply_alias(dev
, id
[i
]);
1656 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1659 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1660 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1661 const struct regulator_config
*config
)
1663 struct regulator_enable_gpio
*pin
;
1664 struct gpio_desc
*gpiod
;
1667 gpiod
= gpio_to_desc(config
->ena_gpio
);
1669 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1670 if (pin
->gpiod
== gpiod
) {
1671 rdev_dbg(rdev
, "GPIO %d is already used\n",
1673 goto update_ena_gpio_to_rdev
;
1677 ret
= gpio_request_one(config
->ena_gpio
,
1678 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1679 rdev_get_name(rdev
));
1683 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1685 gpio_free(config
->ena_gpio
);
1690 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1691 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1693 update_ena_gpio_to_rdev
:
1694 pin
->request_count
++;
1695 rdev
->ena_pin
= pin
;
1699 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1701 struct regulator_enable_gpio
*pin
, *n
;
1706 /* Free the GPIO only in case of no use */
1707 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1708 if (pin
->gpiod
== rdev
->ena_pin
->gpiod
) {
1709 if (pin
->request_count
<= 1) {
1710 pin
->request_count
= 0;
1711 gpiod_put(pin
->gpiod
);
1712 list_del(&pin
->list
);
1714 rdev
->ena_pin
= NULL
;
1717 pin
->request_count
--;
1724 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1725 * @rdev: regulator_dev structure
1726 * @enable: enable GPIO at initial use?
1728 * GPIO is enabled in case of initial use. (enable_count is 0)
1729 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1731 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1733 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1739 /* Enable GPIO at initial use */
1740 if (pin
->enable_count
== 0)
1741 gpiod_set_value_cansleep(pin
->gpiod
,
1742 !pin
->ena_gpio_invert
);
1744 pin
->enable_count
++;
1746 if (pin
->enable_count
> 1) {
1747 pin
->enable_count
--;
1751 /* Disable GPIO if not used */
1752 if (pin
->enable_count
<= 1) {
1753 gpiod_set_value_cansleep(pin
->gpiod
,
1754 pin
->ena_gpio_invert
);
1755 pin
->enable_count
= 0;
1763 * _regulator_enable_delay - a delay helper function
1764 * @delay: time to delay in microseconds
1766 * Delay for the requested amount of time as per the guidelines in:
1768 * Documentation/timers/timers-howto.txt
1770 * The assumption here is that regulators will never be enabled in
1771 * atomic context and therefore sleeping functions can be used.
1773 static void _regulator_enable_delay(unsigned int delay
)
1775 unsigned int ms
= delay
/ 1000;
1776 unsigned int us
= delay
% 1000;
1780 * For small enough values, handle super-millisecond
1781 * delays in the usleep_range() call below.
1790 * Give the scheduler some room to coalesce with any other
1791 * wakeup sources. For delays shorter than 10 us, don't even
1792 * bother setting up high-resolution timers and just busy-
1796 usleep_range(us
, us
+ 100);
1801 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1805 /* Query before enabling in case configuration dependent. */
1806 ret
= _regulator_get_enable_time(rdev
);
1810 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1814 trace_regulator_enable(rdev_get_name(rdev
));
1816 if (rdev
->desc
->off_on_delay
) {
1817 /* if needed, keep a distance of off_on_delay from last time
1818 * this regulator was disabled.
1820 unsigned long start_jiffy
= jiffies
;
1821 unsigned long intended
, max_delay
, remaining
;
1823 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
1824 intended
= rdev
->last_off_jiffy
+ max_delay
;
1826 if (time_before(start_jiffy
, intended
)) {
1827 /* calc remaining jiffies to deal with one-time
1829 * in case of multiple timer wrapping, either it can be
1830 * detected by out-of-range remaining, or it cannot be
1831 * detected and we gets a panelty of
1832 * _regulator_enable_delay().
1834 remaining
= intended
- start_jiffy
;
1835 if (remaining
<= max_delay
)
1836 _regulator_enable_delay(
1837 jiffies_to_usecs(remaining
));
1841 if (rdev
->ena_pin
) {
1842 if (!rdev
->ena_gpio_state
) {
1843 ret
= regulator_ena_gpio_ctrl(rdev
, true);
1846 rdev
->ena_gpio_state
= 1;
1848 } else if (rdev
->desc
->ops
->enable
) {
1849 ret
= rdev
->desc
->ops
->enable(rdev
);
1856 /* Allow the regulator to ramp; it would be useful to extend
1857 * this for bulk operations so that the regulators can ramp
1859 trace_regulator_enable_delay(rdev_get_name(rdev
));
1861 _regulator_enable_delay(delay
);
1863 trace_regulator_enable_complete(rdev_get_name(rdev
));
1868 /* locks held by regulator_enable() */
1869 static int _regulator_enable(struct regulator_dev
*rdev
)
1873 /* check voltage and requested load before enabling */
1874 if (rdev
->constraints
&&
1875 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1876 drms_uA_update(rdev
);
1878 if (rdev
->use_count
== 0) {
1879 /* The regulator may on if it's not switchable or left on */
1880 ret
= _regulator_is_enabled(rdev
);
1881 if (ret
== -EINVAL
|| ret
== 0) {
1882 if (!_regulator_can_change_status(rdev
))
1885 ret
= _regulator_do_enable(rdev
);
1889 } else if (ret
< 0) {
1890 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1893 /* Fallthrough on positive return values - already enabled */
1902 * regulator_enable - enable regulator output
1903 * @regulator: regulator source
1905 * Request that the regulator be enabled with the regulator output at
1906 * the predefined voltage or current value. Calls to regulator_enable()
1907 * must be balanced with calls to regulator_disable().
1909 * NOTE: the output value can be set by other drivers, boot loader or may be
1910 * hardwired in the regulator.
1912 int regulator_enable(struct regulator
*regulator
)
1914 struct regulator_dev
*rdev
= regulator
->rdev
;
1917 if (regulator
->always_on
)
1921 ret
= regulator_enable(rdev
->supply
);
1926 mutex_lock(&rdev
->mutex
);
1927 ret
= _regulator_enable(rdev
);
1928 mutex_unlock(&rdev
->mutex
);
1930 if (ret
!= 0 && rdev
->supply
)
1931 regulator_disable(rdev
->supply
);
1935 EXPORT_SYMBOL_GPL(regulator_enable
);
1937 static int _regulator_do_disable(struct regulator_dev
*rdev
)
1941 trace_regulator_disable(rdev_get_name(rdev
));
1943 if (rdev
->ena_pin
) {
1944 if (rdev
->ena_gpio_state
) {
1945 ret
= regulator_ena_gpio_ctrl(rdev
, false);
1948 rdev
->ena_gpio_state
= 0;
1951 } else if (rdev
->desc
->ops
->disable
) {
1952 ret
= rdev
->desc
->ops
->disable(rdev
);
1957 /* cares about last_off_jiffy only if off_on_delay is required by
1960 if (rdev
->desc
->off_on_delay
)
1961 rdev
->last_off_jiffy
= jiffies
;
1963 trace_regulator_disable_complete(rdev_get_name(rdev
));
1968 /* locks held by regulator_disable() */
1969 static int _regulator_disable(struct regulator_dev
*rdev
)
1973 if (WARN(rdev
->use_count
<= 0,
1974 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1977 /* are we the last user and permitted to disable ? */
1978 if (rdev
->use_count
== 1 &&
1979 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1981 /* we are last user */
1982 if (_regulator_can_change_status(rdev
)) {
1983 ret
= _notifier_call_chain(rdev
,
1984 REGULATOR_EVENT_PRE_DISABLE
,
1986 if (ret
& NOTIFY_STOP_MASK
)
1989 ret
= _regulator_do_disable(rdev
);
1991 rdev_err(rdev
, "failed to disable\n");
1992 _notifier_call_chain(rdev
,
1993 REGULATOR_EVENT_ABORT_DISABLE
,
1997 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
2001 rdev
->use_count
= 0;
2002 } else if (rdev
->use_count
> 1) {
2004 if (rdev
->constraints
&&
2005 (rdev
->constraints
->valid_ops_mask
&
2006 REGULATOR_CHANGE_DRMS
))
2007 drms_uA_update(rdev
);
2016 * regulator_disable - disable regulator output
2017 * @regulator: regulator source
2019 * Disable the regulator output voltage or current. Calls to
2020 * regulator_enable() must be balanced with calls to
2021 * regulator_disable().
2023 * NOTE: this will only disable the regulator output if no other consumer
2024 * devices have it enabled, the regulator device supports disabling and
2025 * machine constraints permit this operation.
2027 int regulator_disable(struct regulator
*regulator
)
2029 struct regulator_dev
*rdev
= regulator
->rdev
;
2032 if (regulator
->always_on
)
2035 mutex_lock(&rdev
->mutex
);
2036 ret
= _regulator_disable(rdev
);
2037 mutex_unlock(&rdev
->mutex
);
2039 if (ret
== 0 && rdev
->supply
)
2040 regulator_disable(rdev
->supply
);
2044 EXPORT_SYMBOL_GPL(regulator_disable
);
2046 /* locks held by regulator_force_disable() */
2047 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2051 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2052 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2053 if (ret
& NOTIFY_STOP_MASK
)
2056 ret
= _regulator_do_disable(rdev
);
2058 rdev_err(rdev
, "failed to force disable\n");
2059 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2060 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2064 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2065 REGULATOR_EVENT_DISABLE
, NULL
);
2071 * regulator_force_disable - force disable regulator output
2072 * @regulator: regulator source
2074 * Forcibly disable the regulator output voltage or current.
2075 * NOTE: this *will* disable the regulator output even if other consumer
2076 * devices have it enabled. This should be used for situations when device
2077 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2079 int regulator_force_disable(struct regulator
*regulator
)
2081 struct regulator_dev
*rdev
= regulator
->rdev
;
2084 mutex_lock(&rdev
->mutex
);
2085 regulator
->uA_load
= 0;
2086 ret
= _regulator_force_disable(regulator
->rdev
);
2087 mutex_unlock(&rdev
->mutex
);
2090 while (rdev
->open_count
--)
2091 regulator_disable(rdev
->supply
);
2095 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2097 static void regulator_disable_work(struct work_struct
*work
)
2099 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2103 mutex_lock(&rdev
->mutex
);
2105 BUG_ON(!rdev
->deferred_disables
);
2107 count
= rdev
->deferred_disables
;
2108 rdev
->deferred_disables
= 0;
2110 for (i
= 0; i
< count
; i
++) {
2111 ret
= _regulator_disable(rdev
);
2113 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2116 mutex_unlock(&rdev
->mutex
);
2119 for (i
= 0; i
< count
; i
++) {
2120 ret
= regulator_disable(rdev
->supply
);
2123 "Supply disable failed: %d\n", ret
);
2130 * regulator_disable_deferred - disable regulator output with delay
2131 * @regulator: regulator source
2132 * @ms: miliseconds until the regulator is disabled
2134 * Execute regulator_disable() on the regulator after a delay. This
2135 * is intended for use with devices that require some time to quiesce.
2137 * NOTE: this will only disable the regulator output if no other consumer
2138 * devices have it enabled, the regulator device supports disabling and
2139 * machine constraints permit this operation.
2141 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2143 struct regulator_dev
*rdev
= regulator
->rdev
;
2146 if (regulator
->always_on
)
2150 return regulator_disable(regulator
);
2152 mutex_lock(&rdev
->mutex
);
2153 rdev
->deferred_disables
++;
2154 mutex_unlock(&rdev
->mutex
);
2156 ret
= queue_delayed_work(system_power_efficient_wq
,
2157 &rdev
->disable_work
,
2158 msecs_to_jiffies(ms
));
2164 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2166 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2168 /* A GPIO control always takes precedence */
2170 return rdev
->ena_gpio_state
;
2172 /* If we don't know then assume that the regulator is always on */
2173 if (!rdev
->desc
->ops
->is_enabled
)
2176 return rdev
->desc
->ops
->is_enabled(rdev
);
2180 * regulator_is_enabled - is the regulator output enabled
2181 * @regulator: regulator source
2183 * Returns positive if the regulator driver backing the source/client
2184 * has requested that the device be enabled, zero if it hasn't, else a
2185 * negative errno code.
2187 * Note that the device backing this regulator handle can have multiple
2188 * users, so it might be enabled even if regulator_enable() was never
2189 * called for this particular source.
2191 int regulator_is_enabled(struct regulator
*regulator
)
2195 if (regulator
->always_on
)
2198 mutex_lock(®ulator
->rdev
->mutex
);
2199 ret
= _regulator_is_enabled(regulator
->rdev
);
2200 mutex_unlock(®ulator
->rdev
->mutex
);
2204 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2207 * regulator_can_change_voltage - check if regulator can change voltage
2208 * @regulator: regulator source
2210 * Returns positive if the regulator driver backing the source/client
2211 * can change its voltage, false otherwise. Useful for detecting fixed
2212 * or dummy regulators and disabling voltage change logic in the client
2215 int regulator_can_change_voltage(struct regulator
*regulator
)
2217 struct regulator_dev
*rdev
= regulator
->rdev
;
2219 if (rdev
->constraints
&&
2220 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2221 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2224 if (rdev
->desc
->continuous_voltage_range
&&
2225 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2226 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2232 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2235 * regulator_count_voltages - count regulator_list_voltage() selectors
2236 * @regulator: regulator source
2238 * Returns number of selectors, or negative errno. Selectors are
2239 * numbered starting at zero, and typically correspond to bitfields
2240 * in hardware registers.
2242 int regulator_count_voltages(struct regulator
*regulator
)
2244 struct regulator_dev
*rdev
= regulator
->rdev
;
2246 if (rdev
->desc
->n_voltages
)
2247 return rdev
->desc
->n_voltages
;
2252 return regulator_count_voltages(rdev
->supply
);
2254 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2257 * regulator_list_voltage - enumerate supported voltages
2258 * @regulator: regulator source
2259 * @selector: identify voltage to list
2260 * Context: can sleep
2262 * Returns a voltage that can be passed to @regulator_set_voltage(),
2263 * zero if this selector code can't be used on this system, or a
2266 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2268 struct regulator_dev
*rdev
= regulator
->rdev
;
2269 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2272 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2273 return rdev
->desc
->fixed_uV
;
2275 if (ops
->list_voltage
) {
2276 if (selector
>= rdev
->desc
->n_voltages
)
2278 mutex_lock(&rdev
->mutex
);
2279 ret
= ops
->list_voltage(rdev
, selector
);
2280 mutex_unlock(&rdev
->mutex
);
2281 } else if (rdev
->supply
) {
2282 ret
= regulator_list_voltage(rdev
->supply
, selector
);
2288 if (ret
< rdev
->constraints
->min_uV
)
2290 else if (ret
> rdev
->constraints
->max_uV
)
2296 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2299 * regulator_get_regmap - get the regulator's register map
2300 * @regulator: regulator source
2302 * Returns the register map for the given regulator, or an ERR_PTR value
2303 * if the regulator doesn't use regmap.
2305 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
2307 struct regmap
*map
= regulator
->rdev
->regmap
;
2309 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
2313 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2314 * @regulator: regulator source
2315 * @vsel_reg: voltage selector register, output parameter
2316 * @vsel_mask: mask for voltage selector bitfield, output parameter
2318 * Returns the hardware register offset and bitmask used for setting the
2319 * regulator voltage. This might be useful when configuring voltage-scaling
2320 * hardware or firmware that can make I2C requests behind the kernel's back,
2323 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2324 * and 0 is returned, otherwise a negative errno is returned.
2326 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
2328 unsigned *vsel_mask
)
2330 struct regulator_dev
*rdev
= regulator
->rdev
;
2331 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2333 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2336 *vsel_reg
= rdev
->desc
->vsel_reg
;
2337 *vsel_mask
= rdev
->desc
->vsel_mask
;
2341 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
2344 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2345 * @regulator: regulator source
2346 * @selector: identify voltage to list
2348 * Converts the selector to a hardware-specific voltage selector that can be
2349 * directly written to the regulator registers. The address of the voltage
2350 * register can be determined by calling @regulator_get_hardware_vsel_register.
2352 * On error a negative errno is returned.
2354 int regulator_list_hardware_vsel(struct regulator
*regulator
,
2357 struct regulator_dev
*rdev
= regulator
->rdev
;
2358 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2360 if (selector
>= rdev
->desc
->n_voltages
)
2362 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2367 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
2370 * regulator_get_linear_step - return the voltage step size between VSEL values
2371 * @regulator: regulator source
2373 * Returns the voltage step size between VSEL values for linear
2374 * regulators, or return 0 if the regulator isn't a linear regulator.
2376 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2378 struct regulator_dev
*rdev
= regulator
->rdev
;
2380 return rdev
->desc
->uV_step
;
2382 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2385 * regulator_is_supported_voltage - check if a voltage range can be supported
2387 * @regulator: Regulator to check.
2388 * @min_uV: Minimum required voltage in uV.
2389 * @max_uV: Maximum required voltage in uV.
2391 * Returns a boolean or a negative error code.
2393 int regulator_is_supported_voltage(struct regulator
*regulator
,
2394 int min_uV
, int max_uV
)
2396 struct regulator_dev
*rdev
= regulator
->rdev
;
2397 int i
, voltages
, ret
;
2399 /* If we can't change voltage check the current voltage */
2400 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2401 ret
= regulator_get_voltage(regulator
);
2403 return min_uV
<= ret
&& ret
<= max_uV
;
2408 /* Any voltage within constrains range is fine? */
2409 if (rdev
->desc
->continuous_voltage_range
)
2410 return min_uV
>= rdev
->constraints
->min_uV
&&
2411 max_uV
<= rdev
->constraints
->max_uV
;
2413 ret
= regulator_count_voltages(regulator
);
2418 for (i
= 0; i
< voltages
; i
++) {
2419 ret
= regulator_list_voltage(regulator
, i
);
2421 if (ret
>= min_uV
&& ret
<= max_uV
)
2427 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2429 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
2430 int min_uV
, int max_uV
,
2433 struct pre_voltage_change_data data
;
2436 data
.old_uV
= _regulator_get_voltage(rdev
);
2437 data
.min_uV
= min_uV
;
2438 data
.max_uV
= max_uV
;
2439 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2441 if (ret
& NOTIFY_STOP_MASK
)
2444 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
2448 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2449 (void *)data
.old_uV
);
2454 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
2455 int uV
, unsigned selector
)
2457 struct pre_voltage_change_data data
;
2460 data
.old_uV
= _regulator_get_voltage(rdev
);
2463 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2465 if (ret
& NOTIFY_STOP_MASK
)
2468 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
2472 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2473 (void *)data
.old_uV
);
2478 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2479 int min_uV
, int max_uV
)
2484 unsigned int selector
;
2485 int old_selector
= -1;
2487 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2489 min_uV
+= rdev
->constraints
->uV_offset
;
2490 max_uV
+= rdev
->constraints
->uV_offset
;
2493 * If we can't obtain the old selector there is not enough
2494 * info to call set_voltage_time_sel().
2496 if (_regulator_is_enabled(rdev
) &&
2497 rdev
->desc
->ops
->set_voltage_time_sel
&&
2498 rdev
->desc
->ops
->get_voltage_sel
) {
2499 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2500 if (old_selector
< 0)
2501 return old_selector
;
2504 if (rdev
->desc
->ops
->set_voltage
) {
2505 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
2509 if (rdev
->desc
->ops
->list_voltage
)
2510 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2513 best_val
= _regulator_get_voltage(rdev
);
2516 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2517 if (rdev
->desc
->ops
->map_voltage
) {
2518 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2521 if (rdev
->desc
->ops
->list_voltage
==
2522 regulator_list_voltage_linear
)
2523 ret
= regulator_map_voltage_linear(rdev
,
2525 else if (rdev
->desc
->ops
->list_voltage
==
2526 regulator_list_voltage_linear_range
)
2527 ret
= regulator_map_voltage_linear_range(rdev
,
2530 ret
= regulator_map_voltage_iterate(rdev
,
2535 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2536 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2538 if (old_selector
== selector
)
2541 ret
= _regulator_call_set_voltage_sel(
2542 rdev
, best_val
, selector
);
2551 /* Call set_voltage_time_sel if successfully obtained old_selector */
2552 if (ret
== 0 && !rdev
->constraints
->ramp_disable
&& old_selector
>= 0
2553 && old_selector
!= selector
) {
2555 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2556 old_selector
, selector
);
2558 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2563 /* Insert any necessary delays */
2564 if (delay
>= 1000) {
2565 mdelay(delay
/ 1000);
2566 udelay(delay
% 1000);
2572 if (ret
== 0 && best_val
>= 0) {
2573 unsigned long data
= best_val
;
2575 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2579 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2585 * regulator_set_voltage - set regulator output voltage
2586 * @regulator: regulator source
2587 * @min_uV: Minimum required voltage in uV
2588 * @max_uV: Maximum acceptable voltage in uV
2590 * Sets a voltage regulator to the desired output voltage. This can be set
2591 * during any regulator state. IOW, regulator can be disabled or enabled.
2593 * If the regulator is enabled then the voltage will change to the new value
2594 * immediately otherwise if the regulator is disabled the regulator will
2595 * output at the new voltage when enabled.
2597 * NOTE: If the regulator is shared between several devices then the lowest
2598 * request voltage that meets the system constraints will be used.
2599 * Regulator system constraints must be set for this regulator before
2600 * calling this function otherwise this call will fail.
2602 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2604 struct regulator_dev
*rdev
= regulator
->rdev
;
2606 int old_min_uV
, old_max_uV
;
2609 mutex_lock(&rdev
->mutex
);
2611 /* If we're setting the same range as last time the change
2612 * should be a noop (some cpufreq implementations use the same
2613 * voltage for multiple frequencies, for example).
2615 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2618 /* If we're trying to set a range that overlaps the current voltage,
2619 * return succesfully even though the regulator does not support
2620 * changing the voltage.
2622 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2623 current_uV
= _regulator_get_voltage(rdev
);
2624 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
2625 regulator
->min_uV
= min_uV
;
2626 regulator
->max_uV
= max_uV
;
2632 if (!rdev
->desc
->ops
->set_voltage
&&
2633 !rdev
->desc
->ops
->set_voltage_sel
) {
2638 /* constraints check */
2639 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2643 /* restore original values in case of error */
2644 old_min_uV
= regulator
->min_uV
;
2645 old_max_uV
= regulator
->max_uV
;
2646 regulator
->min_uV
= min_uV
;
2647 regulator
->max_uV
= max_uV
;
2649 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2653 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2658 mutex_unlock(&rdev
->mutex
);
2661 regulator
->min_uV
= old_min_uV
;
2662 regulator
->max_uV
= old_max_uV
;
2663 mutex_unlock(&rdev
->mutex
);
2666 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2669 * regulator_set_voltage_time - get raise/fall time
2670 * @regulator: regulator source
2671 * @old_uV: starting voltage in microvolts
2672 * @new_uV: target voltage in microvolts
2674 * Provided with the starting and ending voltage, this function attempts to
2675 * calculate the time in microseconds required to rise or fall to this new
2678 int regulator_set_voltage_time(struct regulator
*regulator
,
2679 int old_uV
, int new_uV
)
2681 struct regulator_dev
*rdev
= regulator
->rdev
;
2682 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2688 /* Currently requires operations to do this */
2689 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2690 || !rdev
->desc
->n_voltages
)
2693 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2694 /* We only look for exact voltage matches here */
2695 voltage
= regulator_list_voltage(regulator
, i
);
2700 if (voltage
== old_uV
)
2702 if (voltage
== new_uV
)
2706 if (old_sel
< 0 || new_sel
< 0)
2709 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2711 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2714 * regulator_set_voltage_time_sel - get raise/fall time
2715 * @rdev: regulator source device
2716 * @old_selector: selector for starting voltage
2717 * @new_selector: selector for target voltage
2719 * Provided with the starting and target voltage selectors, this function
2720 * returns time in microseconds required to rise or fall to this new voltage
2722 * Drivers providing ramp_delay in regulation_constraints can use this as their
2723 * set_voltage_time_sel() operation.
2725 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2726 unsigned int old_selector
,
2727 unsigned int new_selector
)
2729 unsigned int ramp_delay
= 0;
2730 int old_volt
, new_volt
;
2732 if (rdev
->constraints
->ramp_delay
)
2733 ramp_delay
= rdev
->constraints
->ramp_delay
;
2734 else if (rdev
->desc
->ramp_delay
)
2735 ramp_delay
= rdev
->desc
->ramp_delay
;
2737 if (ramp_delay
== 0) {
2738 rdev_warn(rdev
, "ramp_delay not set\n");
2743 if (!rdev
->desc
->ops
->list_voltage
)
2746 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2747 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2749 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2751 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2754 * regulator_sync_voltage - re-apply last regulator output voltage
2755 * @regulator: regulator source
2757 * Re-apply the last configured voltage. This is intended to be used
2758 * where some external control source the consumer is cooperating with
2759 * has caused the configured voltage to change.
2761 int regulator_sync_voltage(struct regulator
*regulator
)
2763 struct regulator_dev
*rdev
= regulator
->rdev
;
2764 int ret
, min_uV
, max_uV
;
2766 mutex_lock(&rdev
->mutex
);
2768 if (!rdev
->desc
->ops
->set_voltage
&&
2769 !rdev
->desc
->ops
->set_voltage_sel
) {
2774 /* This is only going to work if we've had a voltage configured. */
2775 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2780 min_uV
= regulator
->min_uV
;
2781 max_uV
= regulator
->max_uV
;
2783 /* This should be a paranoia check... */
2784 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2788 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2792 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2795 mutex_unlock(&rdev
->mutex
);
2798 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2800 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2804 if (rdev
->desc
->ops
->get_voltage_sel
) {
2805 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2808 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2809 } else if (rdev
->desc
->ops
->get_voltage
) {
2810 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2811 } else if (rdev
->desc
->ops
->list_voltage
) {
2812 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2813 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
2814 ret
= rdev
->desc
->fixed_uV
;
2815 } else if (rdev
->supply
) {
2816 ret
= regulator_get_voltage(rdev
->supply
);
2823 return ret
- rdev
->constraints
->uV_offset
;
2827 * regulator_get_voltage - get regulator output voltage
2828 * @regulator: regulator source
2830 * This returns the current regulator voltage in uV.
2832 * NOTE: If the regulator is disabled it will return the voltage value. This
2833 * function should not be used to determine regulator state.
2835 int regulator_get_voltage(struct regulator
*regulator
)
2839 mutex_lock(®ulator
->rdev
->mutex
);
2841 ret
= _regulator_get_voltage(regulator
->rdev
);
2843 mutex_unlock(®ulator
->rdev
->mutex
);
2847 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2850 * regulator_set_current_limit - set regulator output current limit
2851 * @regulator: regulator source
2852 * @min_uA: Minimum supported current in uA
2853 * @max_uA: Maximum supported current in uA
2855 * Sets current sink to the desired output current. This can be set during
2856 * any regulator state. IOW, regulator can be disabled or enabled.
2858 * If the regulator is enabled then the current will change to the new value
2859 * immediately otherwise if the regulator is disabled the regulator will
2860 * output at the new current when enabled.
2862 * NOTE: Regulator system constraints must be set for this regulator before
2863 * calling this function otherwise this call will fail.
2865 int regulator_set_current_limit(struct regulator
*regulator
,
2866 int min_uA
, int max_uA
)
2868 struct regulator_dev
*rdev
= regulator
->rdev
;
2871 mutex_lock(&rdev
->mutex
);
2874 if (!rdev
->desc
->ops
->set_current_limit
) {
2879 /* constraints check */
2880 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2884 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2886 mutex_unlock(&rdev
->mutex
);
2889 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2891 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2895 mutex_lock(&rdev
->mutex
);
2898 if (!rdev
->desc
->ops
->get_current_limit
) {
2903 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2905 mutex_unlock(&rdev
->mutex
);
2910 * regulator_get_current_limit - get regulator output current
2911 * @regulator: regulator source
2913 * This returns the current supplied by the specified current sink in uA.
2915 * NOTE: If the regulator is disabled it will return the current value. This
2916 * function should not be used to determine regulator state.
2918 int regulator_get_current_limit(struct regulator
*regulator
)
2920 return _regulator_get_current_limit(regulator
->rdev
);
2922 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2925 * regulator_set_mode - set regulator operating mode
2926 * @regulator: regulator source
2927 * @mode: operating mode - one of the REGULATOR_MODE constants
2929 * Set regulator operating mode to increase regulator efficiency or improve
2930 * regulation performance.
2932 * NOTE: Regulator system constraints must be set for this regulator before
2933 * calling this function otherwise this call will fail.
2935 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2937 struct regulator_dev
*rdev
= regulator
->rdev
;
2939 int regulator_curr_mode
;
2941 mutex_lock(&rdev
->mutex
);
2944 if (!rdev
->desc
->ops
->set_mode
) {
2949 /* return if the same mode is requested */
2950 if (rdev
->desc
->ops
->get_mode
) {
2951 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2952 if (regulator_curr_mode
== mode
) {
2958 /* constraints check */
2959 ret
= regulator_mode_constrain(rdev
, &mode
);
2963 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2965 mutex_unlock(&rdev
->mutex
);
2968 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2970 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2974 mutex_lock(&rdev
->mutex
);
2977 if (!rdev
->desc
->ops
->get_mode
) {
2982 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2984 mutex_unlock(&rdev
->mutex
);
2989 * regulator_get_mode - get regulator operating mode
2990 * @regulator: regulator source
2992 * Get the current regulator operating mode.
2994 unsigned int regulator_get_mode(struct regulator
*regulator
)
2996 return _regulator_get_mode(regulator
->rdev
);
2998 EXPORT_SYMBOL_GPL(regulator_get_mode
);
3001 * regulator_set_optimum_mode - set regulator optimum operating mode
3002 * @regulator: regulator source
3003 * @uA_load: load current
3005 * Notifies the regulator core of a new device load. This is then used by
3006 * DRMS (if enabled by constraints) to set the most efficient regulator
3007 * operating mode for the new regulator loading.
3009 * Consumer devices notify their supply regulator of the maximum power
3010 * they will require (can be taken from device datasheet in the power
3011 * consumption tables) when they change operational status and hence power
3012 * state. Examples of operational state changes that can affect power
3013 * consumption are :-
3015 * o Device is opened / closed.
3016 * o Device I/O is about to begin or has just finished.
3017 * o Device is idling in between work.
3019 * This information is also exported via sysfs to userspace.
3021 * DRMS will sum the total requested load on the regulator and change
3022 * to the most efficient operating mode if platform constraints allow.
3024 * Returns the new regulator mode or error.
3026 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
3028 struct regulator_dev
*rdev
= regulator
->rdev
;
3031 mutex_lock(&rdev
->mutex
);
3032 regulator
->uA_load
= uA_load
;
3033 ret
= drms_uA_update(rdev
);
3034 mutex_unlock(&rdev
->mutex
);
3038 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
3041 * regulator_allow_bypass - allow the regulator to go into bypass mode
3043 * @regulator: Regulator to configure
3044 * @enable: enable or disable bypass mode
3046 * Allow the regulator to go into bypass mode if all other consumers
3047 * for the regulator also enable bypass mode and the machine
3048 * constraints allow this. Bypass mode means that the regulator is
3049 * simply passing the input directly to the output with no regulation.
3051 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3053 struct regulator_dev
*rdev
= regulator
->rdev
;
3056 if (!rdev
->desc
->ops
->set_bypass
)
3059 if (rdev
->constraints
&&
3060 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
3063 mutex_lock(&rdev
->mutex
);
3065 if (enable
&& !regulator
->bypass
) {
3066 rdev
->bypass_count
++;
3068 if (rdev
->bypass_count
== rdev
->open_count
) {
3069 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3071 rdev
->bypass_count
--;
3074 } else if (!enable
&& regulator
->bypass
) {
3075 rdev
->bypass_count
--;
3077 if (rdev
->bypass_count
!= rdev
->open_count
) {
3078 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3080 rdev
->bypass_count
++;
3085 regulator
->bypass
= enable
;
3087 mutex_unlock(&rdev
->mutex
);
3091 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3094 * regulator_register_notifier - register regulator event notifier
3095 * @regulator: regulator source
3096 * @nb: notifier block
3098 * Register notifier block to receive regulator events.
3100 int regulator_register_notifier(struct regulator
*regulator
,
3101 struct notifier_block
*nb
)
3103 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3106 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3109 * regulator_unregister_notifier - unregister regulator event notifier
3110 * @regulator: regulator source
3111 * @nb: notifier block
3113 * Unregister regulator event notifier block.
3115 int regulator_unregister_notifier(struct regulator
*regulator
,
3116 struct notifier_block
*nb
)
3118 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3121 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3123 /* notify regulator consumers and downstream regulator consumers.
3124 * Note mutex must be held by caller.
3126 static int _notifier_call_chain(struct regulator_dev
*rdev
,
3127 unsigned long event
, void *data
)
3129 /* call rdev chain first */
3130 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3134 * regulator_bulk_get - get multiple regulator consumers
3136 * @dev: Device to supply
3137 * @num_consumers: Number of consumers to register
3138 * @consumers: Configuration of consumers; clients are stored here.
3140 * @return 0 on success, an errno on failure.
3142 * This helper function allows drivers to get several regulator
3143 * consumers in one operation. If any of the regulators cannot be
3144 * acquired then any regulators that were allocated will be freed
3145 * before returning to the caller.
3147 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3148 struct regulator_bulk_data
*consumers
)
3153 for (i
= 0; i
< num_consumers
; i
++)
3154 consumers
[i
].consumer
= NULL
;
3156 for (i
= 0; i
< num_consumers
; i
++) {
3157 consumers
[i
].consumer
= regulator_get(dev
,
3158 consumers
[i
].supply
);
3159 if (IS_ERR(consumers
[i
].consumer
)) {
3160 ret
= PTR_ERR(consumers
[i
].consumer
);
3161 dev_err(dev
, "Failed to get supply '%s': %d\n",
3162 consumers
[i
].supply
, ret
);
3163 consumers
[i
].consumer
= NULL
;
3172 regulator_put(consumers
[i
].consumer
);
3176 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3178 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3180 struct regulator_bulk_data
*bulk
= data
;
3182 bulk
->ret
= regulator_enable(bulk
->consumer
);
3186 * regulator_bulk_enable - enable multiple regulator consumers
3188 * @num_consumers: Number of consumers
3189 * @consumers: Consumer data; clients are stored here.
3190 * @return 0 on success, an errno on failure
3192 * This convenience API allows consumers to enable multiple regulator
3193 * clients in a single API call. If any consumers cannot be enabled
3194 * then any others that were enabled will be disabled again prior to
3197 int regulator_bulk_enable(int num_consumers
,
3198 struct regulator_bulk_data
*consumers
)
3200 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3204 for (i
= 0; i
< num_consumers
; i
++) {
3205 if (consumers
[i
].consumer
->always_on
)
3206 consumers
[i
].ret
= 0;
3208 async_schedule_domain(regulator_bulk_enable_async
,
3209 &consumers
[i
], &async_domain
);
3212 async_synchronize_full_domain(&async_domain
);
3214 /* If any consumer failed we need to unwind any that succeeded */
3215 for (i
= 0; i
< num_consumers
; i
++) {
3216 if (consumers
[i
].ret
!= 0) {
3217 ret
= consumers
[i
].ret
;
3225 for (i
= 0; i
< num_consumers
; i
++) {
3226 if (consumers
[i
].ret
< 0)
3227 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3230 regulator_disable(consumers
[i
].consumer
);
3235 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3238 * regulator_bulk_disable - disable multiple regulator consumers
3240 * @num_consumers: Number of consumers
3241 * @consumers: Consumer data; clients are stored here.
3242 * @return 0 on success, an errno on failure
3244 * This convenience API allows consumers to disable multiple regulator
3245 * clients in a single API call. If any consumers cannot be disabled
3246 * then any others that were disabled will be enabled again prior to
3249 int regulator_bulk_disable(int num_consumers
,
3250 struct regulator_bulk_data
*consumers
)
3255 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3256 ret
= regulator_disable(consumers
[i
].consumer
);
3264 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3265 for (++i
; i
< num_consumers
; ++i
) {
3266 r
= regulator_enable(consumers
[i
].consumer
);
3268 pr_err("Failed to reename %s: %d\n",
3269 consumers
[i
].supply
, r
);
3274 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3277 * regulator_bulk_force_disable - force disable multiple regulator consumers
3279 * @num_consumers: Number of consumers
3280 * @consumers: Consumer data; clients are stored here.
3281 * @return 0 on success, an errno on failure
3283 * This convenience API allows consumers to forcibly disable multiple regulator
3284 * clients in a single API call.
3285 * NOTE: This should be used for situations when device damage will
3286 * likely occur if the regulators are not disabled (e.g. over temp).
3287 * Although regulator_force_disable function call for some consumers can
3288 * return error numbers, the function is called for all consumers.
3290 int regulator_bulk_force_disable(int num_consumers
,
3291 struct regulator_bulk_data
*consumers
)
3296 for (i
= 0; i
< num_consumers
; i
++)
3298 regulator_force_disable(consumers
[i
].consumer
);
3300 for (i
= 0; i
< num_consumers
; i
++) {
3301 if (consumers
[i
].ret
!= 0) {
3302 ret
= consumers
[i
].ret
;
3311 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3314 * regulator_bulk_free - free multiple regulator consumers
3316 * @num_consumers: Number of consumers
3317 * @consumers: Consumer data; clients are stored here.
3319 * This convenience API allows consumers to free multiple regulator
3320 * clients in a single API call.
3322 void regulator_bulk_free(int num_consumers
,
3323 struct regulator_bulk_data
*consumers
)
3327 for (i
= 0; i
< num_consumers
; i
++) {
3328 regulator_put(consumers
[i
].consumer
);
3329 consumers
[i
].consumer
= NULL
;
3332 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3335 * regulator_notifier_call_chain - call regulator event notifier
3336 * @rdev: regulator source
3337 * @event: notifier block
3338 * @data: callback-specific data.
3340 * Called by regulator drivers to notify clients a regulator event has
3341 * occurred. We also notify regulator clients downstream.
3342 * Note lock must be held by caller.
3344 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3345 unsigned long event
, void *data
)
3347 _notifier_call_chain(rdev
, event
, data
);
3351 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3354 * regulator_mode_to_status - convert a regulator mode into a status
3356 * @mode: Mode to convert
3358 * Convert a regulator mode into a status.
3360 int regulator_mode_to_status(unsigned int mode
)
3363 case REGULATOR_MODE_FAST
:
3364 return REGULATOR_STATUS_FAST
;
3365 case REGULATOR_MODE_NORMAL
:
3366 return REGULATOR_STATUS_NORMAL
;
3367 case REGULATOR_MODE_IDLE
:
3368 return REGULATOR_STATUS_IDLE
;
3369 case REGULATOR_MODE_STANDBY
:
3370 return REGULATOR_STATUS_STANDBY
;
3372 return REGULATOR_STATUS_UNDEFINED
;
3375 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3377 static struct attribute
*regulator_dev_attrs
[] = {
3378 &dev_attr_name
.attr
,
3379 &dev_attr_num_users
.attr
,
3380 &dev_attr_type
.attr
,
3381 &dev_attr_microvolts
.attr
,
3382 &dev_attr_microamps
.attr
,
3383 &dev_attr_opmode
.attr
,
3384 &dev_attr_state
.attr
,
3385 &dev_attr_status
.attr
,
3386 &dev_attr_bypass
.attr
,
3387 &dev_attr_requested_microamps
.attr
,
3388 &dev_attr_min_microvolts
.attr
,
3389 &dev_attr_max_microvolts
.attr
,
3390 &dev_attr_min_microamps
.attr
,
3391 &dev_attr_max_microamps
.attr
,
3392 &dev_attr_suspend_standby_state
.attr
,
3393 &dev_attr_suspend_mem_state
.attr
,
3394 &dev_attr_suspend_disk_state
.attr
,
3395 &dev_attr_suspend_standby_microvolts
.attr
,
3396 &dev_attr_suspend_mem_microvolts
.attr
,
3397 &dev_attr_suspend_disk_microvolts
.attr
,
3398 &dev_attr_suspend_standby_mode
.attr
,
3399 &dev_attr_suspend_mem_mode
.attr
,
3400 &dev_attr_suspend_disk_mode
.attr
,
3405 * To avoid cluttering sysfs (and memory) with useless state, only
3406 * create attributes that can be meaningfully displayed.
3408 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
3409 struct attribute
*attr
, int idx
)
3411 struct device
*dev
= kobj_to_dev(kobj
);
3412 struct regulator_dev
*rdev
= container_of(dev
, struct regulator_dev
, dev
);
3413 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3414 umode_t mode
= attr
->mode
;
3416 /* these three are always present */
3417 if (attr
== &dev_attr_name
.attr
||
3418 attr
== &dev_attr_num_users
.attr
||
3419 attr
== &dev_attr_type
.attr
)
3422 /* some attributes need specific methods to be displayed */
3423 if (attr
== &dev_attr_microvolts
.attr
) {
3424 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3425 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3426 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3427 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
3432 if (attr
== &dev_attr_microamps
.attr
)
3433 return ops
->get_current_limit
? mode
: 0;
3435 if (attr
== &dev_attr_opmode
.attr
)
3436 return ops
->get_mode
? mode
: 0;
3438 if (attr
== &dev_attr_state
.attr
)
3439 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
3441 if (attr
== &dev_attr_status
.attr
)
3442 return ops
->get_status
? mode
: 0;
3444 if (attr
== &dev_attr_bypass
.attr
)
3445 return ops
->get_bypass
? mode
: 0;
3447 /* some attributes are type-specific */
3448 if (attr
== &dev_attr_requested_microamps
.attr
)
3449 return rdev
->desc
->type
== REGULATOR_CURRENT
? mode
: 0;
3451 /* constraints need specific supporting methods */
3452 if (attr
== &dev_attr_min_microvolts
.attr
||
3453 attr
== &dev_attr_max_microvolts
.attr
)
3454 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
3456 if (attr
== &dev_attr_min_microamps
.attr
||
3457 attr
== &dev_attr_max_microamps
.attr
)
3458 return ops
->set_current_limit
? mode
: 0;
3460 if (attr
== &dev_attr_suspend_standby_state
.attr
||
3461 attr
== &dev_attr_suspend_mem_state
.attr
||
3462 attr
== &dev_attr_suspend_disk_state
.attr
)
3465 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
3466 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
3467 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
3468 return ops
->set_suspend_voltage
? mode
: 0;
3470 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
3471 attr
== &dev_attr_suspend_mem_mode
.attr
||
3472 attr
== &dev_attr_suspend_disk_mode
.attr
)
3473 return ops
->set_suspend_mode
? mode
: 0;
3478 static const struct attribute_group regulator_dev_group
= {
3479 .attrs
= regulator_dev_attrs
,
3480 .is_visible
= regulator_attr_is_visible
,
3483 static const struct attribute_group
*regulator_dev_groups
[] = {
3484 ®ulator_dev_group
,
3488 static void regulator_dev_release(struct device
*dev
)
3490 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
3494 static struct class regulator_class
= {
3495 .name
= "regulator",
3496 .dev_release
= regulator_dev_release
,
3497 .dev_groups
= regulator_dev_groups
,
3500 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3502 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3503 if (!rdev
->debugfs
) {
3504 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3508 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3510 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3512 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3513 &rdev
->bypass_count
);
3517 * regulator_register - register regulator
3518 * @regulator_desc: regulator to register
3519 * @cfg: runtime configuration for regulator
3521 * Called by regulator drivers to register a regulator.
3522 * Returns a valid pointer to struct regulator_dev on success
3523 * or an ERR_PTR() on error.
3525 struct regulator_dev
*
3526 regulator_register(const struct regulator_desc
*regulator_desc
,
3527 const struct regulator_config
*cfg
)
3529 const struct regulation_constraints
*constraints
= NULL
;
3530 const struct regulator_init_data
*init_data
;
3531 struct regulator_config
*config
= NULL
;
3532 static atomic_t regulator_no
= ATOMIC_INIT(-1);
3533 struct regulator_dev
*rdev
;
3536 const char *supply
= NULL
;
3538 if (regulator_desc
== NULL
|| cfg
== NULL
)
3539 return ERR_PTR(-EINVAL
);
3544 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3545 return ERR_PTR(-EINVAL
);
3547 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3548 regulator_desc
->type
!= REGULATOR_CURRENT
)
3549 return ERR_PTR(-EINVAL
);
3551 /* Only one of each should be implemented */
3552 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3553 regulator_desc
->ops
->get_voltage_sel
);
3554 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3555 regulator_desc
->ops
->set_voltage_sel
);
3557 /* If we're using selectors we must implement list_voltage. */
3558 if (regulator_desc
->ops
->get_voltage_sel
&&
3559 !regulator_desc
->ops
->list_voltage
) {
3560 return ERR_PTR(-EINVAL
);
3562 if (regulator_desc
->ops
->set_voltage_sel
&&
3563 !regulator_desc
->ops
->list_voltage
) {
3564 return ERR_PTR(-EINVAL
);
3567 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3569 return ERR_PTR(-ENOMEM
);
3572 * Duplicate the config so the driver could override it after
3573 * parsing init data.
3575 config
= kmemdup(cfg
, sizeof(*cfg
), GFP_KERNEL
);
3576 if (config
== NULL
) {
3578 return ERR_PTR(-ENOMEM
);
3581 init_data
= regulator_of_get_init_data(dev
, regulator_desc
, config
,
3582 &rdev
->dev
.of_node
);
3584 init_data
= config
->init_data
;
3585 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
3588 mutex_lock(®ulator_list_mutex
);
3590 mutex_init(&rdev
->mutex
);
3591 rdev
->reg_data
= config
->driver_data
;
3592 rdev
->owner
= regulator_desc
->owner
;
3593 rdev
->desc
= regulator_desc
;
3595 rdev
->regmap
= config
->regmap
;
3596 else if (dev_get_regmap(dev
, NULL
))
3597 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3598 else if (dev
->parent
)
3599 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3600 INIT_LIST_HEAD(&rdev
->consumer_list
);
3601 INIT_LIST_HEAD(&rdev
->list
);
3602 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3603 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3605 /* preform any regulator specific init */
3606 if (init_data
&& init_data
->regulator_init
) {
3607 ret
= init_data
->regulator_init(rdev
->reg_data
);
3612 /* register with sysfs */
3613 rdev
->dev
.class = ®ulator_class
;
3614 rdev
->dev
.parent
= dev
;
3615 dev_set_name(&rdev
->dev
, "regulator.%lu",
3616 (unsigned long) atomic_inc_return(®ulator_no
));
3617 ret
= device_register(&rdev
->dev
);
3619 put_device(&rdev
->dev
);
3623 dev_set_drvdata(&rdev
->dev
, rdev
);
3625 if ((config
->ena_gpio
|| config
->ena_gpio_initialized
) &&
3626 gpio_is_valid(config
->ena_gpio
)) {
3627 ret
= regulator_ena_gpio_request(rdev
, config
);
3629 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3630 config
->ena_gpio
, ret
);
3635 /* set regulator constraints */
3637 constraints
= &init_data
->constraints
;
3639 ret
= set_machine_constraints(rdev
, constraints
);
3643 if (init_data
&& init_data
->supply_regulator
)
3644 supply
= init_data
->supply_regulator
;
3645 else if (regulator_desc
->supply_name
)
3646 supply
= regulator_desc
->supply_name
;
3649 struct regulator_dev
*r
;
3651 r
= regulator_dev_lookup(dev
, supply
, &ret
);
3653 if (ret
== -ENODEV
) {
3655 * No supply was specified for this regulator and
3656 * there will never be one.
3661 dev_err(dev
, "Failed to find supply %s\n", supply
);
3662 ret
= -EPROBE_DEFER
;
3666 ret
= set_supply(rdev
, r
);
3670 /* Enable supply if rail is enabled */
3671 if (_regulator_is_enabled(rdev
)) {
3672 ret
= regulator_enable(rdev
->supply
);
3679 /* add consumers devices */
3681 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3682 ret
= set_consumer_device_supply(rdev
,
3683 init_data
->consumer_supplies
[i
].dev_name
,
3684 init_data
->consumer_supplies
[i
].supply
);
3686 dev_err(dev
, "Failed to set supply %s\n",
3687 init_data
->consumer_supplies
[i
].supply
);
3688 goto unset_supplies
;
3693 list_add(&rdev
->list
, ®ulator_list
);
3695 rdev_init_debugfs(rdev
);
3697 mutex_unlock(®ulator_list_mutex
);
3702 unset_regulator_supplies(rdev
);
3706 _regulator_put(rdev
->supply
);
3707 regulator_ena_gpio_free(rdev
);
3708 kfree(rdev
->constraints
);
3710 device_unregister(&rdev
->dev
);
3711 /* device core frees rdev */
3712 rdev
= ERR_PTR(ret
);
3717 rdev
= ERR_PTR(ret
);
3720 EXPORT_SYMBOL_GPL(regulator_register
);
3723 * regulator_unregister - unregister regulator
3724 * @rdev: regulator to unregister
3726 * Called by regulator drivers to unregister a regulator.
3728 void regulator_unregister(struct regulator_dev
*rdev
)
3734 while (rdev
->use_count
--)
3735 regulator_disable(rdev
->supply
);
3736 regulator_put(rdev
->supply
);
3738 mutex_lock(®ulator_list_mutex
);
3739 debugfs_remove_recursive(rdev
->debugfs
);
3740 flush_work(&rdev
->disable_work
.work
);
3741 WARN_ON(rdev
->open_count
);
3742 unset_regulator_supplies(rdev
);
3743 list_del(&rdev
->list
);
3744 kfree(rdev
->constraints
);
3745 regulator_ena_gpio_free(rdev
);
3746 of_node_put(rdev
->dev
.of_node
);
3747 device_unregister(&rdev
->dev
);
3748 mutex_unlock(®ulator_list_mutex
);
3750 EXPORT_SYMBOL_GPL(regulator_unregister
);
3753 * regulator_suspend_prepare - prepare regulators for system wide suspend
3754 * @state: system suspend state
3756 * Configure each regulator with it's suspend operating parameters for state.
3757 * This will usually be called by machine suspend code prior to supending.
3759 int regulator_suspend_prepare(suspend_state_t state
)
3761 struct regulator_dev
*rdev
;
3764 /* ON is handled by regulator active state */
3765 if (state
== PM_SUSPEND_ON
)
3768 mutex_lock(®ulator_list_mutex
);
3769 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3771 mutex_lock(&rdev
->mutex
);
3772 ret
= suspend_prepare(rdev
, state
);
3773 mutex_unlock(&rdev
->mutex
);
3776 rdev_err(rdev
, "failed to prepare\n");
3781 mutex_unlock(®ulator_list_mutex
);
3784 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3787 * regulator_suspend_finish - resume regulators from system wide suspend
3789 * Turn on regulators that might be turned off by regulator_suspend_prepare
3790 * and that should be turned on according to the regulators properties.
3792 int regulator_suspend_finish(void)
3794 struct regulator_dev
*rdev
;
3797 mutex_lock(®ulator_list_mutex
);
3798 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3799 mutex_lock(&rdev
->mutex
);
3800 if (rdev
->use_count
> 0 || rdev
->constraints
->always_on
) {
3801 if (!_regulator_is_enabled(rdev
)) {
3802 error
= _regulator_do_enable(rdev
);
3807 if (!have_full_constraints())
3809 if (!_regulator_is_enabled(rdev
))
3812 error
= _regulator_do_disable(rdev
);
3817 mutex_unlock(&rdev
->mutex
);
3819 mutex_unlock(®ulator_list_mutex
);
3822 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3825 * regulator_has_full_constraints - the system has fully specified constraints
3827 * Calling this function will cause the regulator API to disable all
3828 * regulators which have a zero use count and don't have an always_on
3829 * constraint in a late_initcall.
3831 * The intention is that this will become the default behaviour in a
3832 * future kernel release so users are encouraged to use this facility
3835 void regulator_has_full_constraints(void)
3837 has_full_constraints
= 1;
3839 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3842 * rdev_get_drvdata - get rdev regulator driver data
3845 * Get rdev regulator driver private data. This call can be used in the
3846 * regulator driver context.
3848 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3850 return rdev
->reg_data
;
3852 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3855 * regulator_get_drvdata - get regulator driver data
3856 * @regulator: regulator
3858 * Get regulator driver private data. This call can be used in the consumer
3859 * driver context when non API regulator specific functions need to be called.
3861 void *regulator_get_drvdata(struct regulator
*regulator
)
3863 return regulator
->rdev
->reg_data
;
3865 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3868 * regulator_set_drvdata - set regulator driver data
3869 * @regulator: regulator
3872 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3874 regulator
->rdev
->reg_data
= data
;
3876 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3879 * regulator_get_id - get regulator ID
3882 int rdev_get_id(struct regulator_dev
*rdev
)
3884 return rdev
->desc
->id
;
3886 EXPORT_SYMBOL_GPL(rdev_get_id
);
3888 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3892 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3894 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3896 return reg_init_data
->driver_data
;
3898 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3900 #ifdef CONFIG_DEBUG_FS
3901 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3902 size_t count
, loff_t
*ppos
)
3904 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3905 ssize_t len
, ret
= 0;
3906 struct regulator_map
*map
;
3911 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3912 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3914 rdev_get_name(map
->regulator
), map
->dev_name
,
3918 if (ret
> PAGE_SIZE
) {
3924 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3932 static const struct file_operations supply_map_fops
= {
3933 #ifdef CONFIG_DEBUG_FS
3934 .read
= supply_map_read_file
,
3935 .llseek
= default_llseek
,
3939 static int __init
regulator_init(void)
3943 ret
= class_register(®ulator_class
);
3945 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3947 pr_warn("regulator: Failed to create debugfs directory\n");
3949 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3952 regulator_dummy_init();
3957 /* init early to allow our consumers to complete system booting */
3958 core_initcall(regulator_init
);
3960 static int __init
regulator_init_complete(void)
3962 struct regulator_dev
*rdev
;
3963 const struct regulator_ops
*ops
;
3964 struct regulation_constraints
*c
;
3968 * Since DT doesn't provide an idiomatic mechanism for
3969 * enabling full constraints and since it's much more natural
3970 * with DT to provide them just assume that a DT enabled
3971 * system has full constraints.
3973 if (of_have_populated_dt())
3974 has_full_constraints
= true;
3976 mutex_lock(®ulator_list_mutex
);
3978 /* If we have a full configuration then disable any regulators
3979 * we have permission to change the status for and which are
3980 * not in use or always_on. This is effectively the default
3981 * for DT and ACPI as they have full constraints.
3983 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3984 ops
= rdev
->desc
->ops
;
3985 c
= rdev
->constraints
;
3987 if (c
&& c
->always_on
)
3990 if (c
&& !(c
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
))
3993 mutex_lock(&rdev
->mutex
);
3995 if (rdev
->use_count
)
3998 /* If we can't read the status assume it's on. */
3999 if (ops
->is_enabled
)
4000 enabled
= ops
->is_enabled(rdev
);
4007 if (have_full_constraints()) {
4008 /* We log since this may kill the system if it
4010 rdev_info(rdev
, "disabling\n");
4011 ret
= _regulator_do_disable(rdev
);
4013 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4015 /* The intention is that in future we will
4016 * assume that full constraints are provided
4017 * so warn even if we aren't going to do
4020 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4024 mutex_unlock(&rdev
->mutex
);
4027 mutex_unlock(®ulator_list_mutex
);
4031 late_initcall_sync(regulator_init_complete
);