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>
28 #include <linux/regmap.h>
29 #include <linux/regulator/of_regulator.h>
30 #include <linux/regulator/consumer.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/machine.h>
33 #include <linux/module.h>
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/regulator.h>
41 #define rdev_crit(rdev, fmt, ...) \
42 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
43 #define rdev_err(rdev, fmt, ...) \
44 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
45 #define rdev_warn(rdev, fmt, ...) \
46 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
47 #define rdev_info(rdev, fmt, ...) \
48 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
49 #define rdev_dbg(rdev, fmt, ...) \
50 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
52 static DEFINE_MUTEX(regulator_list_mutex
);
53 static LIST_HEAD(regulator_list
);
54 static LIST_HEAD(regulator_map_list
);
55 static LIST_HEAD(regulator_ena_gpio_list
);
56 static LIST_HEAD(regulator_supply_alias_list
);
57 static bool has_full_constraints
;
59 static struct dentry
*debugfs_root
;
62 * struct regulator_map
64 * Used to provide symbolic supply names to devices.
66 struct regulator_map
{
67 struct list_head list
;
68 const char *dev_name
; /* The dev_name() for the consumer */
70 struct regulator_dev
*regulator
;
74 * struct regulator_enable_gpio
76 * Management for shared enable GPIO pin
78 struct regulator_enable_gpio
{
79 struct list_head list
;
81 u32 enable_count
; /* a number of enabled shared GPIO */
82 u32 request_count
; /* a number of requested shared GPIO */
83 unsigned int ena_gpio_invert
:1;
87 * struct regulator_supply_alias
89 * Used to map lookups for a supply onto an alternative device.
91 struct regulator_supply_alias
{
92 struct list_head list
;
93 struct device
*src_dev
;
94 const char *src_supply
;
95 struct device
*alias_dev
;
96 const char *alias_supply
;
99 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
100 static int _regulator_disable(struct regulator_dev
*rdev
);
101 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
102 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
103 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
104 static void _notifier_call_chain(struct regulator_dev
*rdev
,
105 unsigned long event
, void *data
);
106 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
107 int min_uV
, int max_uV
);
108 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
110 const char *supply_name
);
112 static const char *rdev_get_name(struct regulator_dev
*rdev
)
114 if (rdev
->constraints
&& rdev
->constraints
->name
)
115 return rdev
->constraints
->name
;
116 else if (rdev
->desc
->name
)
117 return rdev
->desc
->name
;
122 static bool have_full_constraints(void)
124 return has_full_constraints
|| of_have_populated_dt();
128 * of_get_regulator - get a regulator device node based on supply name
129 * @dev: Device pointer for the consumer (of regulator) device
130 * @supply: regulator supply name
132 * Extract the regulator device node corresponding to the supply name.
133 * returns the device node corresponding to the regulator if found, else
136 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
138 struct device_node
*regnode
= NULL
;
139 char prop_name
[32]; /* 32 is max size of property name */
141 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
143 snprintf(prop_name
, 32, "%s-supply", supply
);
144 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
147 dev_dbg(dev
, "Looking up %s property in node %s failed",
148 prop_name
, dev
->of_node
->full_name
);
154 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
156 if (!rdev
->constraints
)
159 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
165 /* Platform voltage constraint check */
166 static int regulator_check_voltage(struct regulator_dev
*rdev
,
167 int *min_uV
, int *max_uV
)
169 BUG_ON(*min_uV
> *max_uV
);
171 if (!rdev
->constraints
) {
172 rdev_err(rdev
, "no constraints\n");
175 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
176 rdev_err(rdev
, "operation not allowed\n");
180 if (*max_uV
> rdev
->constraints
->max_uV
)
181 *max_uV
= rdev
->constraints
->max_uV
;
182 if (*min_uV
< rdev
->constraints
->min_uV
)
183 *min_uV
= rdev
->constraints
->min_uV
;
185 if (*min_uV
> *max_uV
) {
186 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
194 /* Make sure we select a voltage that suits the needs of all
195 * regulator consumers
197 static int regulator_check_consumers(struct regulator_dev
*rdev
,
198 int *min_uV
, int *max_uV
)
200 struct regulator
*regulator
;
202 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
204 * Assume consumers that didn't say anything are OK
205 * with anything in the constraint range.
207 if (!regulator
->min_uV
&& !regulator
->max_uV
)
210 if (*max_uV
> regulator
->max_uV
)
211 *max_uV
= regulator
->max_uV
;
212 if (*min_uV
< regulator
->min_uV
)
213 *min_uV
= regulator
->min_uV
;
216 if (*min_uV
> *max_uV
) {
217 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
225 /* current constraint check */
226 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
227 int *min_uA
, int *max_uA
)
229 BUG_ON(*min_uA
> *max_uA
);
231 if (!rdev
->constraints
) {
232 rdev_err(rdev
, "no constraints\n");
235 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
236 rdev_err(rdev
, "operation not allowed\n");
240 if (*max_uA
> rdev
->constraints
->max_uA
)
241 *max_uA
= rdev
->constraints
->max_uA
;
242 if (*min_uA
< rdev
->constraints
->min_uA
)
243 *min_uA
= rdev
->constraints
->min_uA
;
245 if (*min_uA
> *max_uA
) {
246 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
254 /* operating mode constraint check */
255 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
258 case REGULATOR_MODE_FAST
:
259 case REGULATOR_MODE_NORMAL
:
260 case REGULATOR_MODE_IDLE
:
261 case REGULATOR_MODE_STANDBY
:
264 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
268 if (!rdev
->constraints
) {
269 rdev_err(rdev
, "no constraints\n");
272 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
273 rdev_err(rdev
, "operation not allowed\n");
277 /* The modes are bitmasks, the most power hungry modes having
278 * the lowest values. If the requested mode isn't supported
279 * try higher modes. */
281 if (rdev
->constraints
->valid_modes_mask
& *mode
)
289 /* dynamic regulator mode switching constraint check */
290 static int regulator_check_drms(struct regulator_dev
*rdev
)
292 if (!rdev
->constraints
) {
293 rdev_err(rdev
, "no constraints\n");
296 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
297 rdev_err(rdev
, "operation not allowed\n");
303 static ssize_t
regulator_uV_show(struct device
*dev
,
304 struct device_attribute
*attr
, char *buf
)
306 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
309 mutex_lock(&rdev
->mutex
);
310 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
311 mutex_unlock(&rdev
->mutex
);
315 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
317 static ssize_t
regulator_uA_show(struct device
*dev
,
318 struct device_attribute
*attr
, char *buf
)
320 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
322 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
324 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
326 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
329 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
331 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
333 static DEVICE_ATTR_RO(name
);
335 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
338 case REGULATOR_MODE_FAST
:
339 return sprintf(buf
, "fast\n");
340 case REGULATOR_MODE_NORMAL
:
341 return sprintf(buf
, "normal\n");
342 case REGULATOR_MODE_IDLE
:
343 return sprintf(buf
, "idle\n");
344 case REGULATOR_MODE_STANDBY
:
345 return sprintf(buf
, "standby\n");
347 return sprintf(buf
, "unknown\n");
350 static ssize_t
regulator_opmode_show(struct device
*dev
,
351 struct device_attribute
*attr
, char *buf
)
353 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
355 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
357 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
359 static ssize_t
regulator_print_state(char *buf
, int state
)
362 return sprintf(buf
, "enabled\n");
364 return sprintf(buf
, "disabled\n");
366 return sprintf(buf
, "unknown\n");
369 static ssize_t
regulator_state_show(struct device
*dev
,
370 struct device_attribute
*attr
, char *buf
)
372 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
375 mutex_lock(&rdev
->mutex
);
376 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
377 mutex_unlock(&rdev
->mutex
);
381 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
383 static ssize_t
regulator_status_show(struct device
*dev
,
384 struct device_attribute
*attr
, char *buf
)
386 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
390 status
= rdev
->desc
->ops
->get_status(rdev
);
395 case REGULATOR_STATUS_OFF
:
398 case REGULATOR_STATUS_ON
:
401 case REGULATOR_STATUS_ERROR
:
404 case REGULATOR_STATUS_FAST
:
407 case REGULATOR_STATUS_NORMAL
:
410 case REGULATOR_STATUS_IDLE
:
413 case REGULATOR_STATUS_STANDBY
:
416 case REGULATOR_STATUS_BYPASS
:
419 case REGULATOR_STATUS_UNDEFINED
:
426 return sprintf(buf
, "%s\n", label
);
428 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
430 static ssize_t
regulator_min_uA_show(struct device
*dev
,
431 struct device_attribute
*attr
, char *buf
)
433 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
435 if (!rdev
->constraints
)
436 return sprintf(buf
, "constraint not defined\n");
438 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
440 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
442 static ssize_t
regulator_max_uA_show(struct device
*dev
,
443 struct device_attribute
*attr
, char *buf
)
445 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
447 if (!rdev
->constraints
)
448 return sprintf(buf
, "constraint not defined\n");
450 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
452 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
454 static ssize_t
regulator_min_uV_show(struct device
*dev
,
455 struct device_attribute
*attr
, char *buf
)
457 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
459 if (!rdev
->constraints
)
460 return sprintf(buf
, "constraint not defined\n");
462 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
464 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
466 static ssize_t
regulator_max_uV_show(struct device
*dev
,
467 struct device_attribute
*attr
, char *buf
)
469 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
471 if (!rdev
->constraints
)
472 return sprintf(buf
, "constraint not defined\n");
474 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
476 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
478 static ssize_t
regulator_total_uA_show(struct device
*dev
,
479 struct device_attribute
*attr
, char *buf
)
481 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
482 struct regulator
*regulator
;
485 mutex_lock(&rdev
->mutex
);
486 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
487 uA
+= regulator
->uA_load
;
488 mutex_unlock(&rdev
->mutex
);
489 return sprintf(buf
, "%d\n", uA
);
491 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
493 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
496 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
497 return sprintf(buf
, "%d\n", rdev
->use_count
);
499 static DEVICE_ATTR_RO(num_users
);
501 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
504 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
506 switch (rdev
->desc
->type
) {
507 case REGULATOR_VOLTAGE
:
508 return sprintf(buf
, "voltage\n");
509 case REGULATOR_CURRENT
:
510 return sprintf(buf
, "current\n");
512 return sprintf(buf
, "unknown\n");
514 static DEVICE_ATTR_RO(type
);
516 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
517 struct device_attribute
*attr
, char *buf
)
519 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
521 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
523 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
524 regulator_suspend_mem_uV_show
, NULL
);
526 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
527 struct device_attribute
*attr
, char *buf
)
529 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
531 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
533 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
534 regulator_suspend_disk_uV_show
, NULL
);
536 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
537 struct device_attribute
*attr
, char *buf
)
539 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
541 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
543 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
544 regulator_suspend_standby_uV_show
, NULL
);
546 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
547 struct device_attribute
*attr
, char *buf
)
549 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
551 return regulator_print_opmode(buf
,
552 rdev
->constraints
->state_mem
.mode
);
554 static DEVICE_ATTR(suspend_mem_mode
, 0444,
555 regulator_suspend_mem_mode_show
, NULL
);
557 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
558 struct device_attribute
*attr
, char *buf
)
560 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
562 return regulator_print_opmode(buf
,
563 rdev
->constraints
->state_disk
.mode
);
565 static DEVICE_ATTR(suspend_disk_mode
, 0444,
566 regulator_suspend_disk_mode_show
, NULL
);
568 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
569 struct device_attribute
*attr
, char *buf
)
571 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
573 return regulator_print_opmode(buf
,
574 rdev
->constraints
->state_standby
.mode
);
576 static DEVICE_ATTR(suspend_standby_mode
, 0444,
577 regulator_suspend_standby_mode_show
, NULL
);
579 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
580 struct device_attribute
*attr
, char *buf
)
582 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
584 return regulator_print_state(buf
,
585 rdev
->constraints
->state_mem
.enabled
);
587 static DEVICE_ATTR(suspend_mem_state
, 0444,
588 regulator_suspend_mem_state_show
, NULL
);
590 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
591 struct device_attribute
*attr
, char *buf
)
593 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
595 return regulator_print_state(buf
,
596 rdev
->constraints
->state_disk
.enabled
);
598 static DEVICE_ATTR(suspend_disk_state
, 0444,
599 regulator_suspend_disk_state_show
, NULL
);
601 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
602 struct device_attribute
*attr
, char *buf
)
604 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
606 return regulator_print_state(buf
,
607 rdev
->constraints
->state_standby
.enabled
);
609 static DEVICE_ATTR(suspend_standby_state
, 0444,
610 regulator_suspend_standby_state_show
, NULL
);
612 static ssize_t
regulator_bypass_show(struct device
*dev
,
613 struct device_attribute
*attr
, char *buf
)
615 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
620 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
629 return sprintf(buf
, "%s\n", report
);
631 static DEVICE_ATTR(bypass
, 0444,
632 regulator_bypass_show
, NULL
);
635 * These are the only attributes are present for all regulators.
636 * Other attributes are a function of regulator functionality.
638 static struct attribute
*regulator_dev_attrs
[] = {
640 &dev_attr_num_users
.attr
,
644 ATTRIBUTE_GROUPS(regulator_dev
);
646 static void regulator_dev_release(struct device
*dev
)
648 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
652 static struct class regulator_class
= {
654 .dev_release
= regulator_dev_release
,
655 .dev_groups
= regulator_dev_groups
,
658 /* Calculate the new optimum regulator operating mode based on the new total
659 * consumer load. All locks held by caller */
660 static void drms_uA_update(struct regulator_dev
*rdev
)
662 struct regulator
*sibling
;
663 int current_uA
= 0, output_uV
, input_uV
, err
;
666 err
= regulator_check_drms(rdev
);
667 if (err
< 0 || !rdev
->desc
->ops
->get_optimum_mode
||
668 (!rdev
->desc
->ops
->get_voltage
&&
669 !rdev
->desc
->ops
->get_voltage_sel
) ||
670 !rdev
->desc
->ops
->set_mode
)
673 /* get output voltage */
674 output_uV
= _regulator_get_voltage(rdev
);
678 /* get input voltage */
681 input_uV
= regulator_get_voltage(rdev
->supply
);
683 input_uV
= rdev
->constraints
->input_uV
;
687 /* calc total requested load */
688 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
689 current_uA
+= sibling
->uA_load
;
691 /* now get the optimum mode for our new total regulator load */
692 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
693 output_uV
, current_uA
);
695 /* check the new mode is allowed */
696 err
= regulator_mode_constrain(rdev
, &mode
);
698 rdev
->desc
->ops
->set_mode(rdev
, mode
);
701 static int suspend_set_state(struct regulator_dev
*rdev
,
702 struct regulator_state
*rstate
)
706 /* If we have no suspend mode configration don't set anything;
707 * only warn if the driver implements set_suspend_voltage or
708 * set_suspend_mode callback.
710 if (!rstate
->enabled
&& !rstate
->disabled
) {
711 if (rdev
->desc
->ops
->set_suspend_voltage
||
712 rdev
->desc
->ops
->set_suspend_mode
)
713 rdev_warn(rdev
, "No configuration\n");
717 if (rstate
->enabled
&& rstate
->disabled
) {
718 rdev_err(rdev
, "invalid configuration\n");
722 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
723 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
724 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
725 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
726 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
730 rdev_err(rdev
, "failed to enabled/disable\n");
734 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
735 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
737 rdev_err(rdev
, "failed to set voltage\n");
742 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
743 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
745 rdev_err(rdev
, "failed to set mode\n");
752 /* locks held by caller */
753 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
755 if (!rdev
->constraints
)
759 case PM_SUSPEND_STANDBY
:
760 return suspend_set_state(rdev
,
761 &rdev
->constraints
->state_standby
);
763 return suspend_set_state(rdev
,
764 &rdev
->constraints
->state_mem
);
766 return suspend_set_state(rdev
,
767 &rdev
->constraints
->state_disk
);
773 static void print_constraints(struct regulator_dev
*rdev
)
775 struct regulation_constraints
*constraints
= rdev
->constraints
;
780 if (constraints
->min_uV
&& constraints
->max_uV
) {
781 if (constraints
->min_uV
== constraints
->max_uV
)
782 count
+= sprintf(buf
+ count
, "%d mV ",
783 constraints
->min_uV
/ 1000);
785 count
+= sprintf(buf
+ count
, "%d <--> %d mV ",
786 constraints
->min_uV
/ 1000,
787 constraints
->max_uV
/ 1000);
790 if (!constraints
->min_uV
||
791 constraints
->min_uV
!= constraints
->max_uV
) {
792 ret
= _regulator_get_voltage(rdev
);
794 count
+= sprintf(buf
+ count
, "at %d mV ", ret
/ 1000);
797 if (constraints
->uV_offset
)
798 count
+= sprintf(buf
, "%dmV offset ",
799 constraints
->uV_offset
/ 1000);
801 if (constraints
->min_uA
&& constraints
->max_uA
) {
802 if (constraints
->min_uA
== constraints
->max_uA
)
803 count
+= sprintf(buf
+ count
, "%d mA ",
804 constraints
->min_uA
/ 1000);
806 count
+= sprintf(buf
+ count
, "%d <--> %d mA ",
807 constraints
->min_uA
/ 1000,
808 constraints
->max_uA
/ 1000);
811 if (!constraints
->min_uA
||
812 constraints
->min_uA
!= constraints
->max_uA
) {
813 ret
= _regulator_get_current_limit(rdev
);
815 count
+= sprintf(buf
+ count
, "at %d mA ", ret
/ 1000);
818 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
819 count
+= sprintf(buf
+ count
, "fast ");
820 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
821 count
+= sprintf(buf
+ count
, "normal ");
822 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
823 count
+= sprintf(buf
+ count
, "idle ");
824 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
825 count
+= sprintf(buf
+ count
, "standby");
828 sprintf(buf
, "no parameters");
830 rdev_info(rdev
, "%s\n", buf
);
832 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
833 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
835 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
838 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
839 struct regulation_constraints
*constraints
)
841 struct regulator_ops
*ops
= rdev
->desc
->ops
;
844 /* do we need to apply the constraint voltage */
845 if (rdev
->constraints
->apply_uV
&&
846 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
847 ret
= _regulator_do_set_voltage(rdev
,
848 rdev
->constraints
->min_uV
,
849 rdev
->constraints
->max_uV
);
851 rdev_err(rdev
, "failed to apply %duV constraint\n",
852 rdev
->constraints
->min_uV
);
857 /* constrain machine-level voltage specs to fit
858 * the actual range supported by this regulator.
860 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
861 int count
= rdev
->desc
->n_voltages
;
863 int min_uV
= INT_MAX
;
864 int max_uV
= INT_MIN
;
865 int cmin
= constraints
->min_uV
;
866 int cmax
= constraints
->max_uV
;
868 /* it's safe to autoconfigure fixed-voltage supplies
869 and the constraints are used by list_voltage. */
870 if (count
== 1 && !cmin
) {
873 constraints
->min_uV
= cmin
;
874 constraints
->max_uV
= cmax
;
877 /* voltage constraints are optional */
878 if ((cmin
== 0) && (cmax
== 0))
881 /* else require explicit machine-level constraints */
882 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
883 rdev_err(rdev
, "invalid voltage constraints\n");
887 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
888 for (i
= 0; i
< count
; i
++) {
891 value
= ops
->list_voltage(rdev
, i
);
895 /* maybe adjust [min_uV..max_uV] */
896 if (value
>= cmin
&& value
< min_uV
)
898 if (value
<= cmax
&& value
> max_uV
)
902 /* final: [min_uV..max_uV] valid iff constraints valid */
903 if (max_uV
< min_uV
) {
905 "unsupportable voltage constraints %u-%uuV\n",
910 /* use regulator's subset of machine constraints */
911 if (constraints
->min_uV
< min_uV
) {
912 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
913 constraints
->min_uV
, min_uV
);
914 constraints
->min_uV
= min_uV
;
916 if (constraints
->max_uV
> max_uV
) {
917 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
918 constraints
->max_uV
, max_uV
);
919 constraints
->max_uV
= max_uV
;
926 static int machine_constraints_current(struct regulator_dev
*rdev
,
927 struct regulation_constraints
*constraints
)
929 struct regulator_ops
*ops
= rdev
->desc
->ops
;
932 if (!constraints
->min_uA
&& !constraints
->max_uA
)
935 if (constraints
->min_uA
> constraints
->max_uA
) {
936 rdev_err(rdev
, "Invalid current constraints\n");
940 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
941 rdev_warn(rdev
, "Operation of current configuration missing\n");
945 /* Set regulator current in constraints range */
946 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
947 constraints
->max_uA
);
949 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
957 * set_machine_constraints - sets regulator constraints
958 * @rdev: regulator source
959 * @constraints: constraints to apply
961 * Allows platform initialisation code to define and constrain
962 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
963 * Constraints *must* be set by platform code in order for some
964 * regulator operations to proceed i.e. set_voltage, set_current_limit,
967 static int set_machine_constraints(struct regulator_dev
*rdev
,
968 const struct regulation_constraints
*constraints
)
971 struct regulator_ops
*ops
= rdev
->desc
->ops
;
974 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
977 rdev
->constraints
= kzalloc(sizeof(*constraints
),
979 if (!rdev
->constraints
)
982 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
986 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
990 /* do we need to setup our suspend state */
991 if (rdev
->constraints
->initial_state
) {
992 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
994 rdev_err(rdev
, "failed to set suspend state\n");
999 if (rdev
->constraints
->initial_mode
) {
1000 if (!ops
->set_mode
) {
1001 rdev_err(rdev
, "no set_mode operation\n");
1006 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1008 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1013 /* If the constraints say the regulator should be on at this point
1014 * and we have control then make sure it is enabled.
1016 if ((rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) &&
1018 ret
= ops
->enable(rdev
);
1020 rdev_err(rdev
, "failed to enable\n");
1025 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1026 && ops
->set_ramp_delay
) {
1027 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1029 rdev_err(rdev
, "failed to set ramp_delay\n");
1034 print_constraints(rdev
);
1037 kfree(rdev
->constraints
);
1038 rdev
->constraints
= NULL
;
1043 * set_supply - set regulator supply regulator
1044 * @rdev: regulator name
1045 * @supply_rdev: supply regulator name
1047 * Called by platform initialisation code to set the supply regulator for this
1048 * regulator. This ensures that a regulators supply will also be enabled by the
1049 * core if it's child is enabled.
1051 static int set_supply(struct regulator_dev
*rdev
,
1052 struct regulator_dev
*supply_rdev
)
1056 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1058 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1059 if (rdev
->supply
== NULL
) {
1063 supply_rdev
->open_count
++;
1069 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1070 * @rdev: regulator source
1071 * @consumer_dev_name: dev_name() string for device supply applies to
1072 * @supply: symbolic name for supply
1074 * Allows platform initialisation code to map physical regulator
1075 * sources to symbolic names for supplies for use by devices. Devices
1076 * should use these symbolic names to request regulators, avoiding the
1077 * need to provide board-specific regulator names as platform data.
1079 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1080 const char *consumer_dev_name
,
1083 struct regulator_map
*node
;
1089 if (consumer_dev_name
!= NULL
)
1094 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1095 if (node
->dev_name
&& consumer_dev_name
) {
1096 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1098 } else if (node
->dev_name
|| consumer_dev_name
) {
1102 if (strcmp(node
->supply
, supply
) != 0)
1105 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1107 dev_name(&node
->regulator
->dev
),
1108 node
->regulator
->desc
->name
,
1110 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1114 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1118 node
->regulator
= rdev
;
1119 node
->supply
= supply
;
1122 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1123 if (node
->dev_name
== NULL
) {
1129 list_add(&node
->list
, ®ulator_map_list
);
1133 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1135 struct regulator_map
*node
, *n
;
1137 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1138 if (rdev
== node
->regulator
) {
1139 list_del(&node
->list
);
1140 kfree(node
->dev_name
);
1146 #define REG_STR_SIZE 64
1148 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1150 const char *supply_name
)
1152 struct regulator
*regulator
;
1153 char buf
[REG_STR_SIZE
];
1156 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1157 if (regulator
== NULL
)
1160 mutex_lock(&rdev
->mutex
);
1161 regulator
->rdev
= rdev
;
1162 list_add(®ulator
->list
, &rdev
->consumer_list
);
1165 regulator
->dev
= dev
;
1167 /* Add a link to the device sysfs entry */
1168 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1169 dev
->kobj
.name
, supply_name
);
1170 if (size
>= REG_STR_SIZE
)
1173 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1174 if (regulator
->supply_name
== NULL
)
1177 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1180 rdev_warn(rdev
, "could not add device link %s err %d\n",
1181 dev
->kobj
.name
, err
);
1185 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1186 if (regulator
->supply_name
== NULL
)
1190 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1192 if (!regulator
->debugfs
) {
1193 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1195 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1196 ®ulator
->uA_load
);
1197 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1198 ®ulator
->min_uV
);
1199 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1200 ®ulator
->max_uV
);
1204 * Check now if the regulator is an always on regulator - if
1205 * it is then we don't need to do nearly so much work for
1206 * enable/disable calls.
1208 if (!_regulator_can_change_status(rdev
) &&
1209 _regulator_is_enabled(rdev
))
1210 regulator
->always_on
= true;
1212 mutex_unlock(&rdev
->mutex
);
1215 list_del(®ulator
->list
);
1217 mutex_unlock(&rdev
->mutex
);
1221 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1223 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1224 return rdev
->constraints
->enable_time
;
1225 if (!rdev
->desc
->ops
->enable_time
)
1226 return rdev
->desc
->enable_time
;
1227 return rdev
->desc
->ops
->enable_time(rdev
);
1230 static struct regulator_supply_alias
*regulator_find_supply_alias(
1231 struct device
*dev
, const char *supply
)
1233 struct regulator_supply_alias
*map
;
1235 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1236 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1242 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1244 struct regulator_supply_alias
*map
;
1246 map
= regulator_find_supply_alias(*dev
, *supply
);
1248 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1249 *supply
, map
->alias_supply
,
1250 dev_name(map
->alias_dev
));
1251 *dev
= map
->alias_dev
;
1252 *supply
= map
->alias_supply
;
1256 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1260 struct regulator_dev
*r
;
1261 struct device_node
*node
;
1262 struct regulator_map
*map
;
1263 const char *devname
= NULL
;
1265 regulator_supply_alias(&dev
, &supply
);
1267 /* first do a dt based lookup */
1268 if (dev
&& dev
->of_node
) {
1269 node
= of_get_regulator(dev
, supply
);
1271 list_for_each_entry(r
, ®ulator_list
, list
)
1272 if (r
->dev
.parent
&&
1273 node
== r
->dev
.of_node
)
1277 * If we couldn't even get the node then it's
1278 * not just that the device didn't register
1279 * yet, there's no node and we'll never
1286 /* if not found, try doing it non-dt way */
1288 devname
= dev_name(dev
);
1290 list_for_each_entry(r
, ®ulator_list
, list
)
1291 if (strcmp(rdev_get_name(r
), supply
) == 0)
1294 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1295 /* If the mapping has a device set up it must match */
1296 if (map
->dev_name
&&
1297 (!devname
|| strcmp(map
->dev_name
, devname
)))
1300 if (strcmp(map
->supply
, supply
) == 0)
1301 return map
->regulator
;
1308 /* Internal regulator request function */
1309 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1310 bool exclusive
, bool allow_dummy
)
1312 struct regulator_dev
*rdev
;
1313 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1314 const char *devname
= NULL
;
1315 int ret
= -EPROBE_DEFER
;
1318 pr_err("get() with no identifier\n");
1319 return ERR_PTR(-EINVAL
);
1323 devname
= dev_name(dev
);
1325 mutex_lock(®ulator_list_mutex
);
1327 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1331 regulator
= ERR_PTR(ret
);
1334 * If we have return value from dev_lookup fail, we do not expect to
1335 * succeed, so, quit with appropriate error value
1337 if (ret
&& ret
!= -ENODEV
) {
1342 devname
= "deviceless";
1345 * Assume that a regulator is physically present and enabled
1346 * even if it isn't hooked up and just provide a dummy.
1348 if (have_full_constraints() && allow_dummy
) {
1349 pr_warn("%s supply %s not found, using dummy regulator\n",
1352 rdev
= dummy_regulator_rdev
;
1355 dev_err(dev
, "dummy supplies not allowed\n");
1358 mutex_unlock(®ulator_list_mutex
);
1362 if (rdev
->exclusive
) {
1363 regulator
= ERR_PTR(-EPERM
);
1367 if (exclusive
&& rdev
->open_count
) {
1368 regulator
= ERR_PTR(-EBUSY
);
1372 if (!try_module_get(rdev
->owner
))
1375 regulator
= create_regulator(rdev
, dev
, id
);
1376 if (regulator
== NULL
) {
1377 regulator
= ERR_PTR(-ENOMEM
);
1378 module_put(rdev
->owner
);
1384 rdev
->exclusive
= 1;
1386 ret
= _regulator_is_enabled(rdev
);
1388 rdev
->use_count
= 1;
1390 rdev
->use_count
= 0;
1394 mutex_unlock(®ulator_list_mutex
);
1400 * regulator_get - lookup and obtain a reference to a regulator.
1401 * @dev: device for regulator "consumer"
1402 * @id: Supply name or regulator ID.
1404 * Returns a struct regulator corresponding to the regulator producer,
1405 * or IS_ERR() condition containing errno.
1407 * Use of supply names configured via regulator_set_device_supply() is
1408 * strongly encouraged. It is recommended that the supply name used
1409 * should match the name used for the supply and/or the relevant
1410 * device pins in the datasheet.
1412 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1414 return _regulator_get(dev
, id
, false, true);
1416 EXPORT_SYMBOL_GPL(regulator_get
);
1419 * regulator_get_exclusive - obtain exclusive access to a regulator.
1420 * @dev: device for regulator "consumer"
1421 * @id: Supply name or regulator ID.
1423 * Returns a struct regulator corresponding to the regulator producer,
1424 * or IS_ERR() condition containing errno. Other consumers will be
1425 * unable to obtain this reference is held and the use count for the
1426 * regulator will be initialised to reflect the current state of the
1429 * This is intended for use by consumers which cannot tolerate shared
1430 * use of the regulator such as those which need to force the
1431 * regulator off for correct operation of the hardware they are
1434 * Use of supply names configured via regulator_set_device_supply() is
1435 * strongly encouraged. It is recommended that the supply name used
1436 * should match the name used for the supply and/or the relevant
1437 * device pins in the datasheet.
1439 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1441 return _regulator_get(dev
, id
, true, false);
1443 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1446 * regulator_get_optional - obtain optional access to a regulator.
1447 * @dev: device for regulator "consumer"
1448 * @id: Supply name or regulator ID.
1450 * Returns a struct regulator corresponding to the regulator producer,
1451 * or IS_ERR() condition containing errno. Other consumers will be
1452 * unable to obtain this reference is held and the use count for the
1453 * regulator will be initialised to reflect the current state of the
1456 * This is intended for use by consumers for devices which can have
1457 * some supplies unconnected in normal use, such as some MMC devices.
1458 * It can allow the regulator core to provide stub supplies for other
1459 * supplies requested using normal regulator_get() calls without
1460 * disrupting the operation of drivers that can handle absent
1463 * Use of supply names configured via regulator_set_device_supply() is
1464 * strongly encouraged. It is recommended that the supply name used
1465 * should match the name used for the supply and/or the relevant
1466 * device pins in the datasheet.
1468 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1470 return _regulator_get(dev
, id
, false, false);
1472 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1474 /* Locks held by regulator_put() */
1475 static void _regulator_put(struct regulator
*regulator
)
1477 struct regulator_dev
*rdev
;
1479 if (regulator
== NULL
|| IS_ERR(regulator
))
1482 rdev
= regulator
->rdev
;
1484 debugfs_remove_recursive(regulator
->debugfs
);
1486 /* remove any sysfs entries */
1488 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1489 kfree(regulator
->supply_name
);
1490 list_del(®ulator
->list
);
1494 rdev
->exclusive
= 0;
1496 module_put(rdev
->owner
);
1500 * regulator_put - "free" the regulator source
1501 * @regulator: regulator source
1503 * Note: drivers must ensure that all regulator_enable calls made on this
1504 * regulator source are balanced by regulator_disable calls prior to calling
1507 void regulator_put(struct regulator
*regulator
)
1509 mutex_lock(®ulator_list_mutex
);
1510 _regulator_put(regulator
);
1511 mutex_unlock(®ulator_list_mutex
);
1513 EXPORT_SYMBOL_GPL(regulator_put
);
1516 * regulator_register_supply_alias - Provide device alias for supply lookup
1518 * @dev: device that will be given as the regulator "consumer"
1519 * @id: Supply name or regulator ID
1520 * @alias_dev: device that should be used to lookup the supply
1521 * @alias_id: Supply name or regulator ID that should be used to lookup the
1524 * All lookups for id on dev will instead be conducted for alias_id on
1527 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1528 struct device
*alias_dev
,
1529 const char *alias_id
)
1531 struct regulator_supply_alias
*map
;
1533 map
= regulator_find_supply_alias(dev
, id
);
1537 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1542 map
->src_supply
= id
;
1543 map
->alias_dev
= alias_dev
;
1544 map
->alias_supply
= alias_id
;
1546 list_add(&map
->list
, ®ulator_supply_alias_list
);
1548 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1549 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1553 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1556 * regulator_unregister_supply_alias - Remove device alias
1558 * @dev: device that will be given as the regulator "consumer"
1559 * @id: Supply name or regulator ID
1561 * Remove a lookup alias if one exists for id on dev.
1563 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1565 struct regulator_supply_alias
*map
;
1567 map
= regulator_find_supply_alias(dev
, id
);
1569 list_del(&map
->list
);
1573 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1576 * regulator_bulk_register_supply_alias - register multiple aliases
1578 * @dev: device that will be given as the regulator "consumer"
1579 * @id: List of supply names or regulator IDs
1580 * @alias_dev: device that should be used to lookup the supply
1581 * @alias_id: List of supply names or regulator IDs that should be used to
1583 * @num_id: Number of aliases to register
1585 * @return 0 on success, an errno on failure.
1587 * This helper function allows drivers to register several supply
1588 * aliases in one operation. If any of the aliases cannot be
1589 * registered any aliases that were registered will be removed
1590 * before returning to the caller.
1592 int regulator_bulk_register_supply_alias(struct device
*dev
, const char **id
,
1593 struct device
*alias_dev
,
1594 const char **alias_id
,
1600 for (i
= 0; i
< num_id
; ++i
) {
1601 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1611 "Failed to create supply alias %s,%s -> %s,%s\n",
1612 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1615 regulator_unregister_supply_alias(dev
, id
[i
]);
1619 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1622 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1624 * @dev: device that will be given as the regulator "consumer"
1625 * @id: List of supply names or regulator IDs
1626 * @num_id: Number of aliases to unregister
1628 * This helper function allows drivers to unregister several supply
1629 * aliases in one operation.
1631 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1637 for (i
= 0; i
< num_id
; ++i
)
1638 regulator_unregister_supply_alias(dev
, id
[i
]);
1640 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1643 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1644 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1645 const struct regulator_config
*config
)
1647 struct regulator_enable_gpio
*pin
;
1650 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1651 if (pin
->gpio
== config
->ena_gpio
) {
1652 rdev_dbg(rdev
, "GPIO %d is already used\n",
1654 goto update_ena_gpio_to_rdev
;
1658 ret
= gpio_request_one(config
->ena_gpio
,
1659 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1660 rdev_get_name(rdev
));
1664 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1666 gpio_free(config
->ena_gpio
);
1670 pin
->gpio
= config
->ena_gpio
;
1671 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1672 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1674 update_ena_gpio_to_rdev
:
1675 pin
->request_count
++;
1676 rdev
->ena_pin
= pin
;
1680 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1682 struct regulator_enable_gpio
*pin
, *n
;
1687 /* Free the GPIO only in case of no use */
1688 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1689 if (pin
->gpio
== rdev
->ena_pin
->gpio
) {
1690 if (pin
->request_count
<= 1) {
1691 pin
->request_count
= 0;
1692 gpio_free(pin
->gpio
);
1693 list_del(&pin
->list
);
1696 pin
->request_count
--;
1703 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1704 * @rdev: regulator_dev structure
1705 * @enable: enable GPIO at initial use?
1707 * GPIO is enabled in case of initial use. (enable_count is 0)
1708 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1710 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1712 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1718 /* Enable GPIO at initial use */
1719 if (pin
->enable_count
== 0)
1720 gpio_set_value_cansleep(pin
->gpio
,
1721 !pin
->ena_gpio_invert
);
1723 pin
->enable_count
++;
1725 if (pin
->enable_count
> 1) {
1726 pin
->enable_count
--;
1730 /* Disable GPIO if not used */
1731 if (pin
->enable_count
<= 1) {
1732 gpio_set_value_cansleep(pin
->gpio
,
1733 pin
->ena_gpio_invert
);
1734 pin
->enable_count
= 0;
1741 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1745 /* Query before enabling in case configuration dependent. */
1746 ret
= _regulator_get_enable_time(rdev
);
1750 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1754 trace_regulator_enable(rdev_get_name(rdev
));
1756 if (rdev
->ena_pin
) {
1757 ret
= regulator_ena_gpio_ctrl(rdev
, true);
1760 rdev
->ena_gpio_state
= 1;
1761 } else if (rdev
->desc
->ops
->enable
) {
1762 ret
= rdev
->desc
->ops
->enable(rdev
);
1769 /* Allow the regulator to ramp; it would be useful to extend
1770 * this for bulk operations so that the regulators can ramp
1772 trace_regulator_enable_delay(rdev_get_name(rdev
));
1775 * Delay for the requested amount of time as per the guidelines in:
1777 * Documentation/timers/timers-howto.txt
1779 * The assumption here is that regulators will never be enabled in
1780 * atomic context and therefore sleeping functions can be used.
1783 unsigned int ms
= delay
/ 1000;
1784 unsigned int us
= delay
% 1000;
1788 * For small enough values, handle super-millisecond
1789 * delays in the usleep_range() call below.
1798 * Give the scheduler some room to coalesce with any other
1799 * wakeup sources. For delays shorter than 10 us, don't even
1800 * bother setting up high-resolution timers and just busy-
1804 usleep_range(us
, us
+ 100);
1809 trace_regulator_enable_complete(rdev_get_name(rdev
));
1814 /* locks held by regulator_enable() */
1815 static int _regulator_enable(struct regulator_dev
*rdev
)
1819 /* check voltage and requested load before enabling */
1820 if (rdev
->constraints
&&
1821 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1822 drms_uA_update(rdev
);
1824 if (rdev
->use_count
== 0) {
1825 /* The regulator may on if it's not switchable or left on */
1826 ret
= _regulator_is_enabled(rdev
);
1827 if (ret
== -EINVAL
|| ret
== 0) {
1828 if (!_regulator_can_change_status(rdev
))
1831 ret
= _regulator_do_enable(rdev
);
1835 } else if (ret
< 0) {
1836 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1839 /* Fallthrough on positive return values - already enabled */
1848 * regulator_enable - enable regulator output
1849 * @regulator: regulator source
1851 * Request that the regulator be enabled with the regulator output at
1852 * the predefined voltage or current value. Calls to regulator_enable()
1853 * must be balanced with calls to regulator_disable().
1855 * NOTE: the output value can be set by other drivers, boot loader or may be
1856 * hardwired in the regulator.
1858 int regulator_enable(struct regulator
*regulator
)
1860 struct regulator_dev
*rdev
= regulator
->rdev
;
1863 if (regulator
->always_on
)
1867 ret
= regulator_enable(rdev
->supply
);
1872 mutex_lock(&rdev
->mutex
);
1873 ret
= _regulator_enable(rdev
);
1874 mutex_unlock(&rdev
->mutex
);
1876 if (ret
!= 0 && rdev
->supply
)
1877 regulator_disable(rdev
->supply
);
1881 EXPORT_SYMBOL_GPL(regulator_enable
);
1883 static int _regulator_do_disable(struct regulator_dev
*rdev
)
1887 trace_regulator_disable(rdev_get_name(rdev
));
1889 if (rdev
->ena_pin
) {
1890 ret
= regulator_ena_gpio_ctrl(rdev
, false);
1893 rdev
->ena_gpio_state
= 0;
1895 } else if (rdev
->desc
->ops
->disable
) {
1896 ret
= rdev
->desc
->ops
->disable(rdev
);
1901 trace_regulator_disable_complete(rdev_get_name(rdev
));
1903 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1908 /* locks held by regulator_disable() */
1909 static int _regulator_disable(struct regulator_dev
*rdev
)
1913 if (WARN(rdev
->use_count
<= 0,
1914 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1917 /* are we the last user and permitted to disable ? */
1918 if (rdev
->use_count
== 1 &&
1919 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1921 /* we are last user */
1922 if (_regulator_can_change_status(rdev
)) {
1923 ret
= _regulator_do_disable(rdev
);
1925 rdev_err(rdev
, "failed to disable\n");
1930 rdev
->use_count
= 0;
1931 } else if (rdev
->use_count
> 1) {
1933 if (rdev
->constraints
&&
1934 (rdev
->constraints
->valid_ops_mask
&
1935 REGULATOR_CHANGE_DRMS
))
1936 drms_uA_update(rdev
);
1945 * regulator_disable - disable regulator output
1946 * @regulator: regulator source
1948 * Disable the regulator output voltage or current. Calls to
1949 * regulator_enable() must be balanced with calls to
1950 * regulator_disable().
1952 * NOTE: this will only disable the regulator output if no other consumer
1953 * devices have it enabled, the regulator device supports disabling and
1954 * machine constraints permit this operation.
1956 int regulator_disable(struct regulator
*regulator
)
1958 struct regulator_dev
*rdev
= regulator
->rdev
;
1961 if (regulator
->always_on
)
1964 mutex_lock(&rdev
->mutex
);
1965 ret
= _regulator_disable(rdev
);
1966 mutex_unlock(&rdev
->mutex
);
1968 if (ret
== 0 && rdev
->supply
)
1969 regulator_disable(rdev
->supply
);
1973 EXPORT_SYMBOL_GPL(regulator_disable
);
1975 /* locks held by regulator_force_disable() */
1976 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1981 if (rdev
->desc
->ops
->disable
) {
1982 /* ah well, who wants to live forever... */
1983 ret
= rdev
->desc
->ops
->disable(rdev
);
1985 rdev_err(rdev
, "failed to force disable\n");
1988 /* notify other consumers that power has been forced off */
1989 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1990 REGULATOR_EVENT_DISABLE
, NULL
);
1997 * regulator_force_disable - force disable regulator output
1998 * @regulator: regulator source
2000 * Forcibly disable the regulator output voltage or current.
2001 * NOTE: this *will* disable the regulator output even if other consumer
2002 * devices have it enabled. This should be used for situations when device
2003 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2005 int regulator_force_disable(struct regulator
*regulator
)
2007 struct regulator_dev
*rdev
= regulator
->rdev
;
2010 mutex_lock(&rdev
->mutex
);
2011 regulator
->uA_load
= 0;
2012 ret
= _regulator_force_disable(regulator
->rdev
);
2013 mutex_unlock(&rdev
->mutex
);
2016 while (rdev
->open_count
--)
2017 regulator_disable(rdev
->supply
);
2021 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2023 static void regulator_disable_work(struct work_struct
*work
)
2025 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2029 mutex_lock(&rdev
->mutex
);
2031 BUG_ON(!rdev
->deferred_disables
);
2033 count
= rdev
->deferred_disables
;
2034 rdev
->deferred_disables
= 0;
2036 for (i
= 0; i
< count
; i
++) {
2037 ret
= _regulator_disable(rdev
);
2039 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2042 mutex_unlock(&rdev
->mutex
);
2045 for (i
= 0; i
< count
; i
++) {
2046 ret
= regulator_disable(rdev
->supply
);
2049 "Supply disable failed: %d\n", ret
);
2056 * regulator_disable_deferred - disable regulator output with delay
2057 * @regulator: regulator source
2058 * @ms: miliseconds until the regulator is disabled
2060 * Execute regulator_disable() on the regulator after a delay. This
2061 * is intended for use with devices that require some time to quiesce.
2063 * NOTE: this will only disable the regulator output if no other consumer
2064 * devices have it enabled, the regulator device supports disabling and
2065 * machine constraints permit this operation.
2067 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2069 struct regulator_dev
*rdev
= regulator
->rdev
;
2072 if (regulator
->always_on
)
2076 return regulator_disable(regulator
);
2078 mutex_lock(&rdev
->mutex
);
2079 rdev
->deferred_disables
++;
2080 mutex_unlock(&rdev
->mutex
);
2082 ret
= queue_delayed_work(system_power_efficient_wq
,
2083 &rdev
->disable_work
,
2084 msecs_to_jiffies(ms
));
2090 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2092 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2094 /* A GPIO control always takes precedence */
2096 return rdev
->ena_gpio_state
;
2098 /* If we don't know then assume that the regulator is always on */
2099 if (!rdev
->desc
->ops
->is_enabled
)
2102 return rdev
->desc
->ops
->is_enabled(rdev
);
2106 * regulator_is_enabled - is the regulator output enabled
2107 * @regulator: regulator source
2109 * Returns positive if the regulator driver backing the source/client
2110 * has requested that the device be enabled, zero if it hasn't, else a
2111 * negative errno code.
2113 * Note that the device backing this regulator handle can have multiple
2114 * users, so it might be enabled even if regulator_enable() was never
2115 * called for this particular source.
2117 int regulator_is_enabled(struct regulator
*regulator
)
2121 if (regulator
->always_on
)
2124 mutex_lock(®ulator
->rdev
->mutex
);
2125 ret
= _regulator_is_enabled(regulator
->rdev
);
2126 mutex_unlock(®ulator
->rdev
->mutex
);
2130 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2133 * regulator_can_change_voltage - check if regulator can change voltage
2134 * @regulator: regulator source
2136 * Returns positive if the regulator driver backing the source/client
2137 * can change its voltage, false otherwise. Useful for detecting fixed
2138 * or dummy regulators and disabling voltage change logic in the client
2141 int regulator_can_change_voltage(struct regulator
*regulator
)
2143 struct regulator_dev
*rdev
= regulator
->rdev
;
2145 if (rdev
->constraints
&&
2146 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2147 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2150 if (rdev
->desc
->continuous_voltage_range
&&
2151 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2152 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2158 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2161 * regulator_count_voltages - count regulator_list_voltage() selectors
2162 * @regulator: regulator source
2164 * Returns number of selectors, or negative errno. Selectors are
2165 * numbered starting at zero, and typically correspond to bitfields
2166 * in hardware registers.
2168 int regulator_count_voltages(struct regulator
*regulator
)
2170 struct regulator_dev
*rdev
= regulator
->rdev
;
2172 return rdev
->desc
->n_voltages
? : -EINVAL
;
2174 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2177 * regulator_list_voltage - enumerate supported voltages
2178 * @regulator: regulator source
2179 * @selector: identify voltage to list
2180 * Context: can sleep
2182 * Returns a voltage that can be passed to @regulator_set_voltage(),
2183 * zero if this selector code can't be used on this system, or a
2186 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2188 struct regulator_dev
*rdev
= regulator
->rdev
;
2189 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2192 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2193 return rdev
->desc
->fixed_uV
;
2195 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
2198 mutex_lock(&rdev
->mutex
);
2199 ret
= ops
->list_voltage(rdev
, selector
);
2200 mutex_unlock(&rdev
->mutex
);
2203 if (ret
< rdev
->constraints
->min_uV
)
2205 else if (ret
> rdev
->constraints
->max_uV
)
2211 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2214 * regulator_get_linear_step - return the voltage step size between VSEL values
2215 * @regulator: regulator source
2217 * Returns the voltage step size between VSEL values for linear
2218 * regulators, or return 0 if the regulator isn't a linear regulator.
2220 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2222 struct regulator_dev
*rdev
= regulator
->rdev
;
2224 return rdev
->desc
->uV_step
;
2226 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2229 * regulator_is_supported_voltage - check if a voltage range can be supported
2231 * @regulator: Regulator to check.
2232 * @min_uV: Minimum required voltage in uV.
2233 * @max_uV: Maximum required voltage in uV.
2235 * Returns a boolean or a negative error code.
2237 int regulator_is_supported_voltage(struct regulator
*regulator
,
2238 int min_uV
, int max_uV
)
2240 struct regulator_dev
*rdev
= regulator
->rdev
;
2241 int i
, voltages
, ret
;
2243 /* If we can't change voltage check the current voltage */
2244 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2245 ret
= regulator_get_voltage(regulator
);
2247 return (min_uV
<= ret
&& ret
<= max_uV
);
2252 /* Any voltage within constrains range is fine? */
2253 if (rdev
->desc
->continuous_voltage_range
)
2254 return min_uV
>= rdev
->constraints
->min_uV
&&
2255 max_uV
<= rdev
->constraints
->max_uV
;
2257 ret
= regulator_count_voltages(regulator
);
2262 for (i
= 0; i
< voltages
; i
++) {
2263 ret
= regulator_list_voltage(regulator
, i
);
2265 if (ret
>= min_uV
&& ret
<= max_uV
)
2271 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2273 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2274 int min_uV
, int max_uV
)
2279 unsigned int selector
;
2280 int old_selector
= -1;
2282 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2284 min_uV
+= rdev
->constraints
->uV_offset
;
2285 max_uV
+= rdev
->constraints
->uV_offset
;
2288 * If we can't obtain the old selector there is not enough
2289 * info to call set_voltage_time_sel().
2291 if (_regulator_is_enabled(rdev
) &&
2292 rdev
->desc
->ops
->set_voltage_time_sel
&&
2293 rdev
->desc
->ops
->get_voltage_sel
) {
2294 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2295 if (old_selector
< 0)
2296 return old_selector
;
2299 if (rdev
->desc
->ops
->set_voltage
) {
2300 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
,
2304 if (rdev
->desc
->ops
->list_voltage
)
2305 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2308 best_val
= _regulator_get_voltage(rdev
);
2311 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2312 if (rdev
->desc
->ops
->map_voltage
) {
2313 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2316 if (rdev
->desc
->ops
->list_voltage
==
2317 regulator_list_voltage_linear
)
2318 ret
= regulator_map_voltage_linear(rdev
,
2321 ret
= regulator_map_voltage_iterate(rdev
,
2326 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2327 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2329 if (old_selector
== selector
)
2332 ret
= rdev
->desc
->ops
->set_voltage_sel(
2342 /* Call set_voltage_time_sel if successfully obtained old_selector */
2343 if (ret
== 0 && !rdev
->constraints
->ramp_disable
&& old_selector
>= 0
2344 && old_selector
!= selector
) {
2346 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2347 old_selector
, selector
);
2349 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2354 /* Insert any necessary delays */
2355 if (delay
>= 1000) {
2356 mdelay(delay
/ 1000);
2357 udelay(delay
% 1000);
2363 if (ret
== 0 && best_val
>= 0) {
2364 unsigned long data
= best_val
;
2366 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2370 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2376 * regulator_set_voltage - set regulator output voltage
2377 * @regulator: regulator source
2378 * @min_uV: Minimum required voltage in uV
2379 * @max_uV: Maximum acceptable voltage in uV
2381 * Sets a voltage regulator to the desired output voltage. This can be set
2382 * during any regulator state. IOW, regulator can be disabled or enabled.
2384 * If the regulator is enabled then the voltage will change to the new value
2385 * immediately otherwise if the regulator is disabled the regulator will
2386 * output at the new voltage when enabled.
2388 * NOTE: If the regulator is shared between several devices then the lowest
2389 * request voltage that meets the system constraints will be used.
2390 * Regulator system constraints must be set for this regulator before
2391 * calling this function otherwise this call will fail.
2393 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2395 struct regulator_dev
*rdev
= regulator
->rdev
;
2397 int old_min_uV
, old_max_uV
;
2399 mutex_lock(&rdev
->mutex
);
2401 /* If we're setting the same range as last time the change
2402 * should be a noop (some cpufreq implementations use the same
2403 * voltage for multiple frequencies, for example).
2405 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2409 if (!rdev
->desc
->ops
->set_voltage
&&
2410 !rdev
->desc
->ops
->set_voltage_sel
) {
2415 /* constraints check */
2416 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2420 /* restore original values in case of error */
2421 old_min_uV
= regulator
->min_uV
;
2422 old_max_uV
= regulator
->max_uV
;
2423 regulator
->min_uV
= min_uV
;
2424 regulator
->max_uV
= max_uV
;
2426 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2430 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2435 mutex_unlock(&rdev
->mutex
);
2438 regulator
->min_uV
= old_min_uV
;
2439 regulator
->max_uV
= old_max_uV
;
2440 mutex_unlock(&rdev
->mutex
);
2443 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2446 * regulator_set_voltage_time - get raise/fall time
2447 * @regulator: regulator source
2448 * @old_uV: starting voltage in microvolts
2449 * @new_uV: target voltage in microvolts
2451 * Provided with the starting and ending voltage, this function attempts to
2452 * calculate the time in microseconds required to rise or fall to this new
2455 int regulator_set_voltage_time(struct regulator
*regulator
,
2456 int old_uV
, int new_uV
)
2458 struct regulator_dev
*rdev
= regulator
->rdev
;
2459 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2465 /* Currently requires operations to do this */
2466 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2467 || !rdev
->desc
->n_voltages
)
2470 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2471 /* We only look for exact voltage matches here */
2472 voltage
= regulator_list_voltage(regulator
, i
);
2477 if (voltage
== old_uV
)
2479 if (voltage
== new_uV
)
2483 if (old_sel
< 0 || new_sel
< 0)
2486 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2488 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2491 * regulator_set_voltage_time_sel - get raise/fall time
2492 * @rdev: regulator source device
2493 * @old_selector: selector for starting voltage
2494 * @new_selector: selector for target voltage
2496 * Provided with the starting and target voltage selectors, this function
2497 * returns time in microseconds required to rise or fall to this new voltage
2499 * Drivers providing ramp_delay in regulation_constraints can use this as their
2500 * set_voltage_time_sel() operation.
2502 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2503 unsigned int old_selector
,
2504 unsigned int new_selector
)
2506 unsigned int ramp_delay
= 0;
2507 int old_volt
, new_volt
;
2509 if (rdev
->constraints
->ramp_delay
)
2510 ramp_delay
= rdev
->constraints
->ramp_delay
;
2511 else if (rdev
->desc
->ramp_delay
)
2512 ramp_delay
= rdev
->desc
->ramp_delay
;
2514 if (ramp_delay
== 0) {
2515 rdev_warn(rdev
, "ramp_delay not set\n");
2520 if (!rdev
->desc
->ops
->list_voltage
)
2523 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2524 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2526 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2528 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2531 * regulator_sync_voltage - re-apply last regulator output voltage
2532 * @regulator: regulator source
2534 * Re-apply the last configured voltage. This is intended to be used
2535 * where some external control source the consumer is cooperating with
2536 * has caused the configured voltage to change.
2538 int regulator_sync_voltage(struct regulator
*regulator
)
2540 struct regulator_dev
*rdev
= regulator
->rdev
;
2541 int ret
, min_uV
, max_uV
;
2543 mutex_lock(&rdev
->mutex
);
2545 if (!rdev
->desc
->ops
->set_voltage
&&
2546 !rdev
->desc
->ops
->set_voltage_sel
) {
2551 /* This is only going to work if we've had a voltage configured. */
2552 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2557 min_uV
= regulator
->min_uV
;
2558 max_uV
= regulator
->max_uV
;
2560 /* This should be a paranoia check... */
2561 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2565 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2569 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2572 mutex_unlock(&rdev
->mutex
);
2575 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2577 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2581 if (rdev
->desc
->ops
->get_voltage_sel
) {
2582 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2585 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2586 } else if (rdev
->desc
->ops
->get_voltage
) {
2587 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2588 } else if (rdev
->desc
->ops
->list_voltage
) {
2589 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2590 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
2591 ret
= rdev
->desc
->fixed_uV
;
2598 return ret
- rdev
->constraints
->uV_offset
;
2602 * regulator_get_voltage - get regulator output voltage
2603 * @regulator: regulator source
2605 * This returns the current regulator voltage in uV.
2607 * NOTE: If the regulator is disabled it will return the voltage value. This
2608 * function should not be used to determine regulator state.
2610 int regulator_get_voltage(struct regulator
*regulator
)
2614 mutex_lock(®ulator
->rdev
->mutex
);
2616 ret
= _regulator_get_voltage(regulator
->rdev
);
2618 mutex_unlock(®ulator
->rdev
->mutex
);
2622 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2625 * regulator_set_current_limit - set regulator output current limit
2626 * @regulator: regulator source
2627 * @min_uA: Minimum supported current in uA
2628 * @max_uA: Maximum supported current in uA
2630 * Sets current sink to the desired output current. This can be set during
2631 * any regulator state. IOW, regulator can be disabled or enabled.
2633 * If the regulator is enabled then the current will change to the new value
2634 * immediately otherwise if the regulator is disabled the regulator will
2635 * output at the new current when enabled.
2637 * NOTE: Regulator system constraints must be set for this regulator before
2638 * calling this function otherwise this call will fail.
2640 int regulator_set_current_limit(struct regulator
*regulator
,
2641 int min_uA
, int max_uA
)
2643 struct regulator_dev
*rdev
= regulator
->rdev
;
2646 mutex_lock(&rdev
->mutex
);
2649 if (!rdev
->desc
->ops
->set_current_limit
) {
2654 /* constraints check */
2655 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2659 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2661 mutex_unlock(&rdev
->mutex
);
2664 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2666 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2670 mutex_lock(&rdev
->mutex
);
2673 if (!rdev
->desc
->ops
->get_current_limit
) {
2678 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2680 mutex_unlock(&rdev
->mutex
);
2685 * regulator_get_current_limit - get regulator output current
2686 * @regulator: regulator source
2688 * This returns the current supplied by the specified current sink in uA.
2690 * NOTE: If the regulator is disabled it will return the current value. This
2691 * function should not be used to determine regulator state.
2693 int regulator_get_current_limit(struct regulator
*regulator
)
2695 return _regulator_get_current_limit(regulator
->rdev
);
2697 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2700 * regulator_set_mode - set regulator operating mode
2701 * @regulator: regulator source
2702 * @mode: operating mode - one of the REGULATOR_MODE constants
2704 * Set regulator operating mode to increase regulator efficiency or improve
2705 * regulation performance.
2707 * NOTE: Regulator system constraints must be set for this regulator before
2708 * calling this function otherwise this call will fail.
2710 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2712 struct regulator_dev
*rdev
= regulator
->rdev
;
2714 int regulator_curr_mode
;
2716 mutex_lock(&rdev
->mutex
);
2719 if (!rdev
->desc
->ops
->set_mode
) {
2724 /* return if the same mode is requested */
2725 if (rdev
->desc
->ops
->get_mode
) {
2726 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2727 if (regulator_curr_mode
== mode
) {
2733 /* constraints check */
2734 ret
= regulator_mode_constrain(rdev
, &mode
);
2738 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2740 mutex_unlock(&rdev
->mutex
);
2743 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2745 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2749 mutex_lock(&rdev
->mutex
);
2752 if (!rdev
->desc
->ops
->get_mode
) {
2757 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2759 mutex_unlock(&rdev
->mutex
);
2764 * regulator_get_mode - get regulator operating mode
2765 * @regulator: regulator source
2767 * Get the current regulator operating mode.
2769 unsigned int regulator_get_mode(struct regulator
*regulator
)
2771 return _regulator_get_mode(regulator
->rdev
);
2773 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2776 * regulator_set_optimum_mode - set regulator optimum operating mode
2777 * @regulator: regulator source
2778 * @uA_load: load current
2780 * Notifies the regulator core of a new device load. This is then used by
2781 * DRMS (if enabled by constraints) to set the most efficient regulator
2782 * operating mode for the new regulator loading.
2784 * Consumer devices notify their supply regulator of the maximum power
2785 * they will require (can be taken from device datasheet in the power
2786 * consumption tables) when they change operational status and hence power
2787 * state. Examples of operational state changes that can affect power
2788 * consumption are :-
2790 * o Device is opened / closed.
2791 * o Device I/O is about to begin or has just finished.
2792 * o Device is idling in between work.
2794 * This information is also exported via sysfs to userspace.
2796 * DRMS will sum the total requested load on the regulator and change
2797 * to the most efficient operating mode if platform constraints allow.
2799 * Returns the new regulator mode or error.
2801 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
2803 struct regulator_dev
*rdev
= regulator
->rdev
;
2804 struct regulator
*consumer
;
2805 int ret
, output_uV
, input_uV
= 0, total_uA_load
= 0;
2809 input_uV
= regulator_get_voltage(rdev
->supply
);
2811 mutex_lock(&rdev
->mutex
);
2814 * first check to see if we can set modes at all, otherwise just
2815 * tell the consumer everything is OK.
2817 regulator
->uA_load
= uA_load
;
2818 ret
= regulator_check_drms(rdev
);
2824 if (!rdev
->desc
->ops
->get_optimum_mode
)
2828 * we can actually do this so any errors are indicators of
2829 * potential real failure.
2833 if (!rdev
->desc
->ops
->set_mode
)
2836 /* get output voltage */
2837 output_uV
= _regulator_get_voltage(rdev
);
2838 if (output_uV
<= 0) {
2839 rdev_err(rdev
, "invalid output voltage found\n");
2843 /* No supply? Use constraint voltage */
2845 input_uV
= rdev
->constraints
->input_uV
;
2846 if (input_uV
<= 0) {
2847 rdev_err(rdev
, "invalid input voltage found\n");
2851 /* calc total requested load for this regulator */
2852 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
2853 total_uA_load
+= consumer
->uA_load
;
2855 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
2856 input_uV
, output_uV
,
2858 ret
= regulator_mode_constrain(rdev
, &mode
);
2860 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2861 total_uA_load
, input_uV
, output_uV
);
2865 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2867 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
2872 mutex_unlock(&rdev
->mutex
);
2875 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
2878 * regulator_allow_bypass - allow the regulator to go into bypass mode
2880 * @regulator: Regulator to configure
2881 * @enable: enable or disable bypass mode
2883 * Allow the regulator to go into bypass mode if all other consumers
2884 * for the regulator also enable bypass mode and the machine
2885 * constraints allow this. Bypass mode means that the regulator is
2886 * simply passing the input directly to the output with no regulation.
2888 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
2890 struct regulator_dev
*rdev
= regulator
->rdev
;
2893 if (!rdev
->desc
->ops
->set_bypass
)
2896 if (rdev
->constraints
&&
2897 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
2900 mutex_lock(&rdev
->mutex
);
2902 if (enable
&& !regulator
->bypass
) {
2903 rdev
->bypass_count
++;
2905 if (rdev
->bypass_count
== rdev
->open_count
) {
2906 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2908 rdev
->bypass_count
--;
2911 } else if (!enable
&& regulator
->bypass
) {
2912 rdev
->bypass_count
--;
2914 if (rdev
->bypass_count
!= rdev
->open_count
) {
2915 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2917 rdev
->bypass_count
++;
2922 regulator
->bypass
= enable
;
2924 mutex_unlock(&rdev
->mutex
);
2928 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
2931 * regulator_register_notifier - register regulator event notifier
2932 * @regulator: regulator source
2933 * @nb: notifier block
2935 * Register notifier block to receive regulator events.
2937 int regulator_register_notifier(struct regulator
*regulator
,
2938 struct notifier_block
*nb
)
2940 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
2943 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
2946 * regulator_unregister_notifier - unregister regulator event notifier
2947 * @regulator: regulator source
2948 * @nb: notifier block
2950 * Unregister regulator event notifier block.
2952 int regulator_unregister_notifier(struct regulator
*regulator
,
2953 struct notifier_block
*nb
)
2955 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
2958 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
2960 /* notify regulator consumers and downstream regulator consumers.
2961 * Note mutex must be held by caller.
2963 static void _notifier_call_chain(struct regulator_dev
*rdev
,
2964 unsigned long event
, void *data
)
2966 /* call rdev chain first */
2967 blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
2971 * regulator_bulk_get - get multiple regulator consumers
2973 * @dev: Device to supply
2974 * @num_consumers: Number of consumers to register
2975 * @consumers: Configuration of consumers; clients are stored here.
2977 * @return 0 on success, an errno on failure.
2979 * This helper function allows drivers to get several regulator
2980 * consumers in one operation. If any of the regulators cannot be
2981 * acquired then any regulators that were allocated will be freed
2982 * before returning to the caller.
2984 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
2985 struct regulator_bulk_data
*consumers
)
2990 for (i
= 0; i
< num_consumers
; i
++)
2991 consumers
[i
].consumer
= NULL
;
2993 for (i
= 0; i
< num_consumers
; i
++) {
2994 consumers
[i
].consumer
= regulator_get(dev
,
2995 consumers
[i
].supply
);
2996 if (IS_ERR(consumers
[i
].consumer
)) {
2997 ret
= PTR_ERR(consumers
[i
].consumer
);
2998 dev_err(dev
, "Failed to get supply '%s': %d\n",
2999 consumers
[i
].supply
, ret
);
3000 consumers
[i
].consumer
= NULL
;
3009 regulator_put(consumers
[i
].consumer
);
3013 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3015 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3017 struct regulator_bulk_data
*bulk
= data
;
3019 bulk
->ret
= regulator_enable(bulk
->consumer
);
3023 * regulator_bulk_enable - enable multiple regulator consumers
3025 * @num_consumers: Number of consumers
3026 * @consumers: Consumer data; clients are stored here.
3027 * @return 0 on success, an errno on failure
3029 * This convenience API allows consumers to enable multiple regulator
3030 * clients in a single API call. If any consumers cannot be enabled
3031 * then any others that were enabled will be disabled again prior to
3034 int regulator_bulk_enable(int num_consumers
,
3035 struct regulator_bulk_data
*consumers
)
3037 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3041 for (i
= 0; i
< num_consumers
; i
++) {
3042 if (consumers
[i
].consumer
->always_on
)
3043 consumers
[i
].ret
= 0;
3045 async_schedule_domain(regulator_bulk_enable_async
,
3046 &consumers
[i
], &async_domain
);
3049 async_synchronize_full_domain(&async_domain
);
3051 /* If any consumer failed we need to unwind any that succeeded */
3052 for (i
= 0; i
< num_consumers
; i
++) {
3053 if (consumers
[i
].ret
!= 0) {
3054 ret
= consumers
[i
].ret
;
3062 for (i
= 0; i
< num_consumers
; i
++) {
3063 if (consumers
[i
].ret
< 0)
3064 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3067 regulator_disable(consumers
[i
].consumer
);
3072 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3075 * regulator_bulk_disable - disable multiple regulator consumers
3077 * @num_consumers: Number of consumers
3078 * @consumers: Consumer data; clients are stored here.
3079 * @return 0 on success, an errno on failure
3081 * This convenience API allows consumers to disable multiple regulator
3082 * clients in a single API call. If any consumers cannot be disabled
3083 * then any others that were disabled will be enabled again prior to
3086 int regulator_bulk_disable(int num_consumers
,
3087 struct regulator_bulk_data
*consumers
)
3092 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3093 ret
= regulator_disable(consumers
[i
].consumer
);
3101 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3102 for (++i
; i
< num_consumers
; ++i
) {
3103 r
= regulator_enable(consumers
[i
].consumer
);
3105 pr_err("Failed to reename %s: %d\n",
3106 consumers
[i
].supply
, r
);
3111 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3114 * regulator_bulk_force_disable - force disable multiple regulator consumers
3116 * @num_consumers: Number of consumers
3117 * @consumers: Consumer data; clients are stored here.
3118 * @return 0 on success, an errno on failure
3120 * This convenience API allows consumers to forcibly disable multiple regulator
3121 * clients in a single API call.
3122 * NOTE: This should be used for situations when device damage will
3123 * likely occur if the regulators are not disabled (e.g. over temp).
3124 * Although regulator_force_disable function call for some consumers can
3125 * return error numbers, the function is called for all consumers.
3127 int regulator_bulk_force_disable(int num_consumers
,
3128 struct regulator_bulk_data
*consumers
)
3133 for (i
= 0; i
< num_consumers
; i
++)
3135 regulator_force_disable(consumers
[i
].consumer
);
3137 for (i
= 0; i
< num_consumers
; i
++) {
3138 if (consumers
[i
].ret
!= 0) {
3139 ret
= consumers
[i
].ret
;
3148 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3151 * regulator_bulk_free - free multiple regulator consumers
3153 * @num_consumers: Number of consumers
3154 * @consumers: Consumer data; clients are stored here.
3156 * This convenience API allows consumers to free multiple regulator
3157 * clients in a single API call.
3159 void regulator_bulk_free(int num_consumers
,
3160 struct regulator_bulk_data
*consumers
)
3164 for (i
= 0; i
< num_consumers
; i
++) {
3165 regulator_put(consumers
[i
].consumer
);
3166 consumers
[i
].consumer
= NULL
;
3169 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3172 * regulator_notifier_call_chain - call regulator event notifier
3173 * @rdev: regulator source
3174 * @event: notifier block
3175 * @data: callback-specific data.
3177 * Called by regulator drivers to notify clients a regulator event has
3178 * occurred. We also notify regulator clients downstream.
3179 * Note lock must be held by caller.
3181 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3182 unsigned long event
, void *data
)
3184 _notifier_call_chain(rdev
, event
, data
);
3188 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3191 * regulator_mode_to_status - convert a regulator mode into a status
3193 * @mode: Mode to convert
3195 * Convert a regulator mode into a status.
3197 int regulator_mode_to_status(unsigned int mode
)
3200 case REGULATOR_MODE_FAST
:
3201 return REGULATOR_STATUS_FAST
;
3202 case REGULATOR_MODE_NORMAL
:
3203 return REGULATOR_STATUS_NORMAL
;
3204 case REGULATOR_MODE_IDLE
:
3205 return REGULATOR_STATUS_IDLE
;
3206 case REGULATOR_MODE_STANDBY
:
3207 return REGULATOR_STATUS_STANDBY
;
3209 return REGULATOR_STATUS_UNDEFINED
;
3212 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3215 * To avoid cluttering sysfs (and memory) with useless state, only
3216 * create attributes that can be meaningfully displayed.
3218 static int add_regulator_attributes(struct regulator_dev
*rdev
)
3220 struct device
*dev
= &rdev
->dev
;
3221 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3224 /* some attributes need specific methods to be displayed */
3225 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3226 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3227 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3228 (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1))) {
3229 status
= device_create_file(dev
, &dev_attr_microvolts
);
3233 if (ops
->get_current_limit
) {
3234 status
= device_create_file(dev
, &dev_attr_microamps
);
3238 if (ops
->get_mode
) {
3239 status
= device_create_file(dev
, &dev_attr_opmode
);
3243 if (rdev
->ena_pin
|| ops
->is_enabled
) {
3244 status
= device_create_file(dev
, &dev_attr_state
);
3248 if (ops
->get_status
) {
3249 status
= device_create_file(dev
, &dev_attr_status
);
3253 if (ops
->get_bypass
) {
3254 status
= device_create_file(dev
, &dev_attr_bypass
);
3259 /* some attributes are type-specific */
3260 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
3261 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
3266 /* all the other attributes exist to support constraints;
3267 * don't show them if there are no constraints, or if the
3268 * relevant supporting methods are missing.
3270 if (!rdev
->constraints
)
3273 /* constraints need specific supporting methods */
3274 if (ops
->set_voltage
|| ops
->set_voltage_sel
) {
3275 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
3278 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
3282 if (ops
->set_current_limit
) {
3283 status
= device_create_file(dev
, &dev_attr_min_microamps
);
3286 status
= device_create_file(dev
, &dev_attr_max_microamps
);
3291 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
3294 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
3297 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
3301 if (ops
->set_suspend_voltage
) {
3302 status
= device_create_file(dev
,
3303 &dev_attr_suspend_standby_microvolts
);
3306 status
= device_create_file(dev
,
3307 &dev_attr_suspend_mem_microvolts
);
3310 status
= device_create_file(dev
,
3311 &dev_attr_suspend_disk_microvolts
);
3316 if (ops
->set_suspend_mode
) {
3317 status
= device_create_file(dev
,
3318 &dev_attr_suspend_standby_mode
);
3321 status
= device_create_file(dev
,
3322 &dev_attr_suspend_mem_mode
);
3325 status
= device_create_file(dev
,
3326 &dev_attr_suspend_disk_mode
);
3334 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3336 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3337 if (!rdev
->debugfs
) {
3338 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3342 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3344 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3346 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3347 &rdev
->bypass_count
);
3351 * regulator_register - register regulator
3352 * @regulator_desc: regulator to register
3353 * @config: runtime configuration for regulator
3355 * Called by regulator drivers to register a regulator.
3356 * Returns a valid pointer to struct regulator_dev on success
3357 * or an ERR_PTR() on error.
3359 struct regulator_dev
*
3360 regulator_register(const struct regulator_desc
*regulator_desc
,
3361 const struct regulator_config
*config
)
3363 const struct regulation_constraints
*constraints
= NULL
;
3364 const struct regulator_init_data
*init_data
;
3365 static atomic_t regulator_no
= ATOMIC_INIT(0);
3366 struct regulator_dev
*rdev
;
3369 const char *supply
= NULL
;
3371 if (regulator_desc
== NULL
|| config
== NULL
)
3372 return ERR_PTR(-EINVAL
);
3377 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3378 return ERR_PTR(-EINVAL
);
3380 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3381 regulator_desc
->type
!= REGULATOR_CURRENT
)
3382 return ERR_PTR(-EINVAL
);
3384 /* Only one of each should be implemented */
3385 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3386 regulator_desc
->ops
->get_voltage_sel
);
3387 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3388 regulator_desc
->ops
->set_voltage_sel
);
3390 /* If we're using selectors we must implement list_voltage. */
3391 if (regulator_desc
->ops
->get_voltage_sel
&&
3392 !regulator_desc
->ops
->list_voltage
) {
3393 return ERR_PTR(-EINVAL
);
3395 if (regulator_desc
->ops
->set_voltage_sel
&&
3396 !regulator_desc
->ops
->list_voltage
) {
3397 return ERR_PTR(-EINVAL
);
3400 init_data
= config
->init_data
;
3402 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3404 return ERR_PTR(-ENOMEM
);
3406 mutex_lock(®ulator_list_mutex
);
3408 mutex_init(&rdev
->mutex
);
3409 rdev
->reg_data
= config
->driver_data
;
3410 rdev
->owner
= regulator_desc
->owner
;
3411 rdev
->desc
= regulator_desc
;
3413 rdev
->regmap
= config
->regmap
;
3414 else if (dev_get_regmap(dev
, NULL
))
3415 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3416 else if (dev
->parent
)
3417 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3418 INIT_LIST_HEAD(&rdev
->consumer_list
);
3419 INIT_LIST_HEAD(&rdev
->list
);
3420 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3421 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3423 /* preform any regulator specific init */
3424 if (init_data
&& init_data
->regulator_init
) {
3425 ret
= init_data
->regulator_init(rdev
->reg_data
);
3430 /* register with sysfs */
3431 rdev
->dev
.class = ®ulator_class
;
3432 rdev
->dev
.of_node
= config
->of_node
;
3433 rdev
->dev
.parent
= dev
;
3434 dev_set_name(&rdev
->dev
, "regulator.%d",
3435 atomic_inc_return(®ulator_no
) - 1);
3436 ret
= device_register(&rdev
->dev
);
3438 put_device(&rdev
->dev
);
3442 dev_set_drvdata(&rdev
->dev
, rdev
);
3444 if (config
->ena_gpio
&& gpio_is_valid(config
->ena_gpio
)) {
3445 ret
= regulator_ena_gpio_request(rdev
, config
);
3447 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3448 config
->ena_gpio
, ret
);
3452 if (config
->ena_gpio_flags
& GPIOF_OUT_INIT_HIGH
)
3453 rdev
->ena_gpio_state
= 1;
3455 if (config
->ena_gpio_invert
)
3456 rdev
->ena_gpio_state
= !rdev
->ena_gpio_state
;
3459 /* set regulator constraints */
3461 constraints
= &init_data
->constraints
;
3463 ret
= set_machine_constraints(rdev
, constraints
);
3467 /* add attributes supported by this regulator */
3468 ret
= add_regulator_attributes(rdev
);
3472 if (init_data
&& init_data
->supply_regulator
)
3473 supply
= init_data
->supply_regulator
;
3474 else if (regulator_desc
->supply_name
)
3475 supply
= regulator_desc
->supply_name
;
3478 struct regulator_dev
*r
;
3480 r
= regulator_dev_lookup(dev
, supply
, &ret
);
3482 if (ret
== -ENODEV
) {
3484 * No supply was specified for this regulator and
3485 * there will never be one.
3490 dev_err(dev
, "Failed to find supply %s\n", supply
);
3491 ret
= -EPROBE_DEFER
;
3495 ret
= set_supply(rdev
, r
);
3499 /* Enable supply if rail is enabled */
3500 if (_regulator_is_enabled(rdev
)) {
3501 ret
= regulator_enable(rdev
->supply
);
3508 /* add consumers devices */
3510 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3511 ret
= set_consumer_device_supply(rdev
,
3512 init_data
->consumer_supplies
[i
].dev_name
,
3513 init_data
->consumer_supplies
[i
].supply
);
3515 dev_err(dev
, "Failed to set supply %s\n",
3516 init_data
->consumer_supplies
[i
].supply
);
3517 goto unset_supplies
;
3522 list_add(&rdev
->list
, ®ulator_list
);
3524 rdev_init_debugfs(rdev
);
3526 mutex_unlock(®ulator_list_mutex
);
3530 unset_regulator_supplies(rdev
);
3534 _regulator_put(rdev
->supply
);
3535 regulator_ena_gpio_free(rdev
);
3536 kfree(rdev
->constraints
);
3538 device_unregister(&rdev
->dev
);
3539 /* device core frees rdev */
3540 rdev
= ERR_PTR(ret
);
3545 rdev
= ERR_PTR(ret
);
3548 EXPORT_SYMBOL_GPL(regulator_register
);
3551 * regulator_unregister - unregister regulator
3552 * @rdev: regulator to unregister
3554 * Called by regulator drivers to unregister a regulator.
3556 void regulator_unregister(struct regulator_dev
*rdev
)
3562 while (rdev
->use_count
--)
3563 regulator_disable(rdev
->supply
);
3564 regulator_put(rdev
->supply
);
3566 mutex_lock(®ulator_list_mutex
);
3567 debugfs_remove_recursive(rdev
->debugfs
);
3568 flush_work(&rdev
->disable_work
.work
);
3569 WARN_ON(rdev
->open_count
);
3570 unset_regulator_supplies(rdev
);
3571 list_del(&rdev
->list
);
3572 kfree(rdev
->constraints
);
3573 regulator_ena_gpio_free(rdev
);
3574 device_unregister(&rdev
->dev
);
3575 mutex_unlock(®ulator_list_mutex
);
3577 EXPORT_SYMBOL_GPL(regulator_unregister
);
3580 * regulator_suspend_prepare - prepare regulators for system wide suspend
3581 * @state: system suspend state
3583 * Configure each regulator with it's suspend operating parameters for state.
3584 * This will usually be called by machine suspend code prior to supending.
3586 int regulator_suspend_prepare(suspend_state_t state
)
3588 struct regulator_dev
*rdev
;
3591 /* ON is handled by regulator active state */
3592 if (state
== PM_SUSPEND_ON
)
3595 mutex_lock(®ulator_list_mutex
);
3596 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3598 mutex_lock(&rdev
->mutex
);
3599 ret
= suspend_prepare(rdev
, state
);
3600 mutex_unlock(&rdev
->mutex
);
3603 rdev_err(rdev
, "failed to prepare\n");
3608 mutex_unlock(®ulator_list_mutex
);
3611 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3614 * regulator_suspend_finish - resume regulators from system wide suspend
3616 * Turn on regulators that might be turned off by regulator_suspend_prepare
3617 * and that should be turned on according to the regulators properties.
3619 int regulator_suspend_finish(void)
3621 struct regulator_dev
*rdev
;
3624 mutex_lock(®ulator_list_mutex
);
3625 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3626 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3628 mutex_lock(&rdev
->mutex
);
3629 if ((rdev
->use_count
> 0 || rdev
->constraints
->always_on
) &&
3631 error
= ops
->enable(rdev
);
3635 if (!have_full_constraints())
3639 if (!_regulator_is_enabled(rdev
))
3642 error
= ops
->disable(rdev
);
3647 mutex_unlock(&rdev
->mutex
);
3649 mutex_unlock(®ulator_list_mutex
);
3652 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3655 * regulator_has_full_constraints - the system has fully specified constraints
3657 * Calling this function will cause the regulator API to disable all
3658 * regulators which have a zero use count and don't have an always_on
3659 * constraint in a late_initcall.
3661 * The intention is that this will become the default behaviour in a
3662 * future kernel release so users are encouraged to use this facility
3665 void regulator_has_full_constraints(void)
3667 has_full_constraints
= 1;
3669 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3672 * rdev_get_drvdata - get rdev regulator driver data
3675 * Get rdev regulator driver private data. This call can be used in the
3676 * regulator driver context.
3678 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3680 return rdev
->reg_data
;
3682 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3685 * regulator_get_drvdata - get regulator driver data
3686 * @regulator: regulator
3688 * Get regulator driver private data. This call can be used in the consumer
3689 * driver context when non API regulator specific functions need to be called.
3691 void *regulator_get_drvdata(struct regulator
*regulator
)
3693 return regulator
->rdev
->reg_data
;
3695 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3698 * regulator_set_drvdata - set regulator driver data
3699 * @regulator: regulator
3702 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3704 regulator
->rdev
->reg_data
= data
;
3706 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3709 * regulator_get_id - get regulator ID
3712 int rdev_get_id(struct regulator_dev
*rdev
)
3714 return rdev
->desc
->id
;
3716 EXPORT_SYMBOL_GPL(rdev_get_id
);
3718 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3722 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3724 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3726 return reg_init_data
->driver_data
;
3728 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3730 #ifdef CONFIG_DEBUG_FS
3731 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3732 size_t count
, loff_t
*ppos
)
3734 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3735 ssize_t len
, ret
= 0;
3736 struct regulator_map
*map
;
3741 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3742 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3744 rdev_get_name(map
->regulator
), map
->dev_name
,
3748 if (ret
> PAGE_SIZE
) {
3754 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3762 static const struct file_operations supply_map_fops
= {
3763 #ifdef CONFIG_DEBUG_FS
3764 .read
= supply_map_read_file
,
3765 .llseek
= default_llseek
,
3769 static int __init
regulator_init(void)
3773 ret
= class_register(®ulator_class
);
3775 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3777 pr_warn("regulator: Failed to create debugfs directory\n");
3779 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3782 regulator_dummy_init();
3787 /* init early to allow our consumers to complete system booting */
3788 core_initcall(regulator_init
);
3790 static int __init
regulator_init_complete(void)
3792 struct regulator_dev
*rdev
;
3793 struct regulator_ops
*ops
;
3794 struct regulation_constraints
*c
;
3798 * Since DT doesn't provide an idiomatic mechanism for
3799 * enabling full constraints and since it's much more natural
3800 * with DT to provide them just assume that a DT enabled
3801 * system has full constraints.
3803 if (of_have_populated_dt())
3804 has_full_constraints
= true;
3806 mutex_lock(®ulator_list_mutex
);
3808 /* If we have a full configuration then disable any regulators
3809 * which are not in use or always_on. This will become the
3810 * default behaviour in the future.
3812 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3813 ops
= rdev
->desc
->ops
;
3814 c
= rdev
->constraints
;
3816 if (!ops
->disable
|| (c
&& c
->always_on
))
3819 mutex_lock(&rdev
->mutex
);
3821 if (rdev
->use_count
)
3824 /* If we can't read the status assume it's on. */
3825 if (ops
->is_enabled
)
3826 enabled
= ops
->is_enabled(rdev
);
3833 if (have_full_constraints()) {
3834 /* We log since this may kill the system if it
3836 rdev_info(rdev
, "disabling\n");
3837 ret
= ops
->disable(rdev
);
3839 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
3842 /* The intention is that in future we will
3843 * assume that full constraints are provided
3844 * so warn even if we aren't going to do
3847 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
3851 mutex_unlock(&rdev
->mutex
);
3854 mutex_unlock(®ulator_list_mutex
);
3858 late_initcall(regulator_init_complete
);