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
;
123 * of_get_regulator - get a regulator device node based on supply name
124 * @dev: Device pointer for the consumer (of regulator) device
125 * @supply: regulator supply name
127 * Extract the regulator device node corresponding to the supply name.
128 * returns the device node corresponding to the regulator if found, else
131 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
133 struct device_node
*regnode
= NULL
;
134 char prop_name
[32]; /* 32 is max size of property name */
136 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
138 snprintf(prop_name
, 32, "%s-supply", supply
);
139 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
142 dev_dbg(dev
, "Looking up %s property in node %s failed",
143 prop_name
, dev
->of_node
->full_name
);
149 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
151 if (!rdev
->constraints
)
154 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
160 /* Platform voltage constraint check */
161 static int regulator_check_voltage(struct regulator_dev
*rdev
,
162 int *min_uV
, int *max_uV
)
164 BUG_ON(*min_uV
> *max_uV
);
166 if (!rdev
->constraints
) {
167 rdev_err(rdev
, "no constraints\n");
170 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
171 rdev_err(rdev
, "operation not allowed\n");
175 if (*max_uV
> rdev
->constraints
->max_uV
)
176 *max_uV
= rdev
->constraints
->max_uV
;
177 if (*min_uV
< rdev
->constraints
->min_uV
)
178 *min_uV
= rdev
->constraints
->min_uV
;
180 if (*min_uV
> *max_uV
) {
181 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
189 /* Make sure we select a voltage that suits the needs of all
190 * regulator consumers
192 static int regulator_check_consumers(struct regulator_dev
*rdev
,
193 int *min_uV
, int *max_uV
)
195 struct regulator
*regulator
;
197 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
199 * Assume consumers that didn't say anything are OK
200 * with anything in the constraint range.
202 if (!regulator
->min_uV
&& !regulator
->max_uV
)
205 if (*max_uV
> regulator
->max_uV
)
206 *max_uV
= regulator
->max_uV
;
207 if (*min_uV
< regulator
->min_uV
)
208 *min_uV
= regulator
->min_uV
;
211 if (*min_uV
> *max_uV
) {
212 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
220 /* current constraint check */
221 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
222 int *min_uA
, int *max_uA
)
224 BUG_ON(*min_uA
> *max_uA
);
226 if (!rdev
->constraints
) {
227 rdev_err(rdev
, "no constraints\n");
230 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
231 rdev_err(rdev
, "operation not allowed\n");
235 if (*max_uA
> rdev
->constraints
->max_uA
)
236 *max_uA
= rdev
->constraints
->max_uA
;
237 if (*min_uA
< rdev
->constraints
->min_uA
)
238 *min_uA
= rdev
->constraints
->min_uA
;
240 if (*min_uA
> *max_uA
) {
241 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
249 /* operating mode constraint check */
250 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
253 case REGULATOR_MODE_FAST
:
254 case REGULATOR_MODE_NORMAL
:
255 case REGULATOR_MODE_IDLE
:
256 case REGULATOR_MODE_STANDBY
:
259 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
263 if (!rdev
->constraints
) {
264 rdev_err(rdev
, "no constraints\n");
267 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
268 rdev_err(rdev
, "operation not allowed\n");
272 /* The modes are bitmasks, the most power hungry modes having
273 * the lowest values. If the requested mode isn't supported
274 * try higher modes. */
276 if (rdev
->constraints
->valid_modes_mask
& *mode
)
284 /* dynamic regulator mode switching constraint check */
285 static int regulator_check_drms(struct regulator_dev
*rdev
)
287 if (!rdev
->constraints
) {
288 rdev_err(rdev
, "no constraints\n");
291 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
292 rdev_err(rdev
, "operation not allowed\n");
298 static ssize_t
regulator_uV_show(struct device
*dev
,
299 struct device_attribute
*attr
, char *buf
)
301 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
304 mutex_lock(&rdev
->mutex
);
305 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
306 mutex_unlock(&rdev
->mutex
);
310 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
312 static ssize_t
regulator_uA_show(struct device
*dev
,
313 struct device_attribute
*attr
, char *buf
)
315 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
317 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
319 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
321 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
324 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
326 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
328 static DEVICE_ATTR_RO(name
);
330 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
333 case REGULATOR_MODE_FAST
:
334 return sprintf(buf
, "fast\n");
335 case REGULATOR_MODE_NORMAL
:
336 return sprintf(buf
, "normal\n");
337 case REGULATOR_MODE_IDLE
:
338 return sprintf(buf
, "idle\n");
339 case REGULATOR_MODE_STANDBY
:
340 return sprintf(buf
, "standby\n");
342 return sprintf(buf
, "unknown\n");
345 static ssize_t
regulator_opmode_show(struct device
*dev
,
346 struct device_attribute
*attr
, char *buf
)
348 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
350 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
352 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
354 static ssize_t
regulator_print_state(char *buf
, int state
)
357 return sprintf(buf
, "enabled\n");
359 return sprintf(buf
, "disabled\n");
361 return sprintf(buf
, "unknown\n");
364 static ssize_t
regulator_state_show(struct device
*dev
,
365 struct device_attribute
*attr
, char *buf
)
367 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
370 mutex_lock(&rdev
->mutex
);
371 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
372 mutex_unlock(&rdev
->mutex
);
376 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
378 static ssize_t
regulator_status_show(struct device
*dev
,
379 struct device_attribute
*attr
, char *buf
)
381 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
385 status
= rdev
->desc
->ops
->get_status(rdev
);
390 case REGULATOR_STATUS_OFF
:
393 case REGULATOR_STATUS_ON
:
396 case REGULATOR_STATUS_ERROR
:
399 case REGULATOR_STATUS_FAST
:
402 case REGULATOR_STATUS_NORMAL
:
405 case REGULATOR_STATUS_IDLE
:
408 case REGULATOR_STATUS_STANDBY
:
411 case REGULATOR_STATUS_BYPASS
:
414 case REGULATOR_STATUS_UNDEFINED
:
421 return sprintf(buf
, "%s\n", label
);
423 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
425 static ssize_t
regulator_min_uA_show(struct device
*dev
,
426 struct device_attribute
*attr
, char *buf
)
428 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
430 if (!rdev
->constraints
)
431 return sprintf(buf
, "constraint not defined\n");
433 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
435 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
437 static ssize_t
regulator_max_uA_show(struct device
*dev
,
438 struct device_attribute
*attr
, char *buf
)
440 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
442 if (!rdev
->constraints
)
443 return sprintf(buf
, "constraint not defined\n");
445 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
447 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
449 static ssize_t
regulator_min_uV_show(struct device
*dev
,
450 struct device_attribute
*attr
, char *buf
)
452 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
454 if (!rdev
->constraints
)
455 return sprintf(buf
, "constraint not defined\n");
457 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
459 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
461 static ssize_t
regulator_max_uV_show(struct device
*dev
,
462 struct device_attribute
*attr
, char *buf
)
464 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
466 if (!rdev
->constraints
)
467 return sprintf(buf
, "constraint not defined\n");
469 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
471 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
473 static ssize_t
regulator_total_uA_show(struct device
*dev
,
474 struct device_attribute
*attr
, char *buf
)
476 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
477 struct regulator
*regulator
;
480 mutex_lock(&rdev
->mutex
);
481 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
482 uA
+= regulator
->uA_load
;
483 mutex_unlock(&rdev
->mutex
);
484 return sprintf(buf
, "%d\n", uA
);
486 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
488 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
491 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
492 return sprintf(buf
, "%d\n", rdev
->use_count
);
494 static DEVICE_ATTR_RO(num_users
);
496 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
499 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
501 switch (rdev
->desc
->type
) {
502 case REGULATOR_VOLTAGE
:
503 return sprintf(buf
, "voltage\n");
504 case REGULATOR_CURRENT
:
505 return sprintf(buf
, "current\n");
507 return sprintf(buf
, "unknown\n");
509 static DEVICE_ATTR_RO(type
);
511 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
512 struct device_attribute
*attr
, char *buf
)
514 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
516 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
518 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
519 regulator_suspend_mem_uV_show
, NULL
);
521 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
522 struct device_attribute
*attr
, char *buf
)
524 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
526 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
528 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
529 regulator_suspend_disk_uV_show
, NULL
);
531 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
532 struct device_attribute
*attr
, char *buf
)
534 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
536 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
538 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
539 regulator_suspend_standby_uV_show
, NULL
);
541 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
542 struct device_attribute
*attr
, char *buf
)
544 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
546 return regulator_print_opmode(buf
,
547 rdev
->constraints
->state_mem
.mode
);
549 static DEVICE_ATTR(suspend_mem_mode
, 0444,
550 regulator_suspend_mem_mode_show
, NULL
);
552 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
553 struct device_attribute
*attr
, char *buf
)
555 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
557 return regulator_print_opmode(buf
,
558 rdev
->constraints
->state_disk
.mode
);
560 static DEVICE_ATTR(suspend_disk_mode
, 0444,
561 regulator_suspend_disk_mode_show
, NULL
);
563 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
564 struct device_attribute
*attr
, char *buf
)
566 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
568 return regulator_print_opmode(buf
,
569 rdev
->constraints
->state_standby
.mode
);
571 static DEVICE_ATTR(suspend_standby_mode
, 0444,
572 regulator_suspend_standby_mode_show
, NULL
);
574 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
575 struct device_attribute
*attr
, char *buf
)
577 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
579 return regulator_print_state(buf
,
580 rdev
->constraints
->state_mem
.enabled
);
582 static DEVICE_ATTR(suspend_mem_state
, 0444,
583 regulator_suspend_mem_state_show
, NULL
);
585 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
586 struct device_attribute
*attr
, char *buf
)
588 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
590 return regulator_print_state(buf
,
591 rdev
->constraints
->state_disk
.enabled
);
593 static DEVICE_ATTR(suspend_disk_state
, 0444,
594 regulator_suspend_disk_state_show
, NULL
);
596 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
597 struct device_attribute
*attr
, char *buf
)
599 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
601 return regulator_print_state(buf
,
602 rdev
->constraints
->state_standby
.enabled
);
604 static DEVICE_ATTR(suspend_standby_state
, 0444,
605 regulator_suspend_standby_state_show
, NULL
);
607 static ssize_t
regulator_bypass_show(struct device
*dev
,
608 struct device_attribute
*attr
, char *buf
)
610 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
615 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
624 return sprintf(buf
, "%s\n", report
);
626 static DEVICE_ATTR(bypass
, 0444,
627 regulator_bypass_show
, NULL
);
630 * These are the only attributes are present for all regulators.
631 * Other attributes are a function of regulator functionality.
633 static struct attribute
*regulator_dev_attrs
[] = {
635 &dev_attr_num_users
.attr
,
639 ATTRIBUTE_GROUPS(regulator_dev
);
641 static void regulator_dev_release(struct device
*dev
)
643 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
647 static struct class regulator_class
= {
649 .dev_release
= regulator_dev_release
,
650 .dev_groups
= regulator_dev_groups
,
653 /* Calculate the new optimum regulator operating mode based on the new total
654 * consumer load. All locks held by caller */
655 static void drms_uA_update(struct regulator_dev
*rdev
)
657 struct regulator
*sibling
;
658 int current_uA
= 0, output_uV
, input_uV
, err
;
661 err
= regulator_check_drms(rdev
);
662 if (err
< 0 || !rdev
->desc
->ops
->get_optimum_mode
||
663 (!rdev
->desc
->ops
->get_voltage
&&
664 !rdev
->desc
->ops
->get_voltage_sel
) ||
665 !rdev
->desc
->ops
->set_mode
)
668 /* get output voltage */
669 output_uV
= _regulator_get_voltage(rdev
);
673 /* get input voltage */
676 input_uV
= regulator_get_voltage(rdev
->supply
);
678 input_uV
= rdev
->constraints
->input_uV
;
682 /* calc total requested load */
683 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
684 current_uA
+= sibling
->uA_load
;
686 /* now get the optimum mode for our new total regulator load */
687 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
688 output_uV
, current_uA
);
690 /* check the new mode is allowed */
691 err
= regulator_mode_constrain(rdev
, &mode
);
693 rdev
->desc
->ops
->set_mode(rdev
, mode
);
696 static int suspend_set_state(struct regulator_dev
*rdev
,
697 struct regulator_state
*rstate
)
701 /* If we have no suspend mode configration don't set anything;
702 * only warn if the driver implements set_suspend_voltage or
703 * set_suspend_mode callback.
705 if (!rstate
->enabled
&& !rstate
->disabled
) {
706 if (rdev
->desc
->ops
->set_suspend_voltage
||
707 rdev
->desc
->ops
->set_suspend_mode
)
708 rdev_warn(rdev
, "No configuration\n");
712 if (rstate
->enabled
&& rstate
->disabled
) {
713 rdev_err(rdev
, "invalid configuration\n");
717 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
718 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
719 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
720 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
721 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
725 rdev_err(rdev
, "failed to enabled/disable\n");
729 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
730 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
732 rdev_err(rdev
, "failed to set voltage\n");
737 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
738 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
740 rdev_err(rdev
, "failed to set mode\n");
747 /* locks held by caller */
748 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
750 if (!rdev
->constraints
)
754 case PM_SUSPEND_STANDBY
:
755 return suspend_set_state(rdev
,
756 &rdev
->constraints
->state_standby
);
758 return suspend_set_state(rdev
,
759 &rdev
->constraints
->state_mem
);
761 return suspend_set_state(rdev
,
762 &rdev
->constraints
->state_disk
);
768 static void print_constraints(struct regulator_dev
*rdev
)
770 struct regulation_constraints
*constraints
= rdev
->constraints
;
775 if (constraints
->min_uV
&& constraints
->max_uV
) {
776 if (constraints
->min_uV
== constraints
->max_uV
)
777 count
+= sprintf(buf
+ count
, "%d mV ",
778 constraints
->min_uV
/ 1000);
780 count
+= sprintf(buf
+ count
, "%d <--> %d mV ",
781 constraints
->min_uV
/ 1000,
782 constraints
->max_uV
/ 1000);
785 if (!constraints
->min_uV
||
786 constraints
->min_uV
!= constraints
->max_uV
) {
787 ret
= _regulator_get_voltage(rdev
);
789 count
+= sprintf(buf
+ count
, "at %d mV ", ret
/ 1000);
792 if (constraints
->uV_offset
)
793 count
+= sprintf(buf
, "%dmV offset ",
794 constraints
->uV_offset
/ 1000);
796 if (constraints
->min_uA
&& constraints
->max_uA
) {
797 if (constraints
->min_uA
== constraints
->max_uA
)
798 count
+= sprintf(buf
+ count
, "%d mA ",
799 constraints
->min_uA
/ 1000);
801 count
+= sprintf(buf
+ count
, "%d <--> %d mA ",
802 constraints
->min_uA
/ 1000,
803 constraints
->max_uA
/ 1000);
806 if (!constraints
->min_uA
||
807 constraints
->min_uA
!= constraints
->max_uA
) {
808 ret
= _regulator_get_current_limit(rdev
);
810 count
+= sprintf(buf
+ count
, "at %d mA ", ret
/ 1000);
813 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
814 count
+= sprintf(buf
+ count
, "fast ");
815 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
816 count
+= sprintf(buf
+ count
, "normal ");
817 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
818 count
+= sprintf(buf
+ count
, "idle ");
819 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
820 count
+= sprintf(buf
+ count
, "standby");
823 sprintf(buf
, "no parameters");
825 rdev_info(rdev
, "%s\n", buf
);
827 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
828 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
830 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
833 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
834 struct regulation_constraints
*constraints
)
836 struct regulator_ops
*ops
= rdev
->desc
->ops
;
839 /* do we need to apply the constraint voltage */
840 if (rdev
->constraints
->apply_uV
&&
841 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
842 ret
= _regulator_do_set_voltage(rdev
,
843 rdev
->constraints
->min_uV
,
844 rdev
->constraints
->max_uV
);
846 rdev_err(rdev
, "failed to apply %duV constraint\n",
847 rdev
->constraints
->min_uV
);
852 /* constrain machine-level voltage specs to fit
853 * the actual range supported by this regulator.
855 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
856 int count
= rdev
->desc
->n_voltages
;
858 int min_uV
= INT_MAX
;
859 int max_uV
= INT_MIN
;
860 int cmin
= constraints
->min_uV
;
861 int cmax
= constraints
->max_uV
;
863 /* it's safe to autoconfigure fixed-voltage supplies
864 and the constraints are used by list_voltage. */
865 if (count
== 1 && !cmin
) {
868 constraints
->min_uV
= cmin
;
869 constraints
->max_uV
= cmax
;
872 /* voltage constraints are optional */
873 if ((cmin
== 0) && (cmax
== 0))
876 /* else require explicit machine-level constraints */
877 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
878 rdev_err(rdev
, "invalid voltage constraints\n");
882 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
883 for (i
= 0; i
< count
; i
++) {
886 value
= ops
->list_voltage(rdev
, i
);
890 /* maybe adjust [min_uV..max_uV] */
891 if (value
>= cmin
&& value
< min_uV
)
893 if (value
<= cmax
&& value
> max_uV
)
897 /* final: [min_uV..max_uV] valid iff constraints valid */
898 if (max_uV
< min_uV
) {
900 "unsupportable voltage constraints %u-%uuV\n",
905 /* use regulator's subset of machine constraints */
906 if (constraints
->min_uV
< min_uV
) {
907 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
908 constraints
->min_uV
, min_uV
);
909 constraints
->min_uV
= min_uV
;
911 if (constraints
->max_uV
> max_uV
) {
912 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
913 constraints
->max_uV
, max_uV
);
914 constraints
->max_uV
= max_uV
;
921 static int machine_constraints_current(struct regulator_dev
*rdev
,
922 struct regulation_constraints
*constraints
)
924 struct regulator_ops
*ops
= rdev
->desc
->ops
;
927 if (!constraints
->min_uA
&& !constraints
->max_uA
)
930 if (constraints
->min_uA
> constraints
->max_uA
) {
931 rdev_err(rdev
, "Invalid current constraints\n");
935 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
936 rdev_warn(rdev
, "Operation of current configuration missing\n");
940 /* Set regulator current in constraints range */
941 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
942 constraints
->max_uA
);
944 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
952 * set_machine_constraints - sets regulator constraints
953 * @rdev: regulator source
954 * @constraints: constraints to apply
956 * Allows platform initialisation code to define and constrain
957 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
958 * Constraints *must* be set by platform code in order for some
959 * regulator operations to proceed i.e. set_voltage, set_current_limit,
962 static int set_machine_constraints(struct regulator_dev
*rdev
,
963 const struct regulation_constraints
*constraints
)
966 struct regulator_ops
*ops
= rdev
->desc
->ops
;
969 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
972 rdev
->constraints
= kzalloc(sizeof(*constraints
),
974 if (!rdev
->constraints
)
977 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
981 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
985 /* do we need to setup our suspend state */
986 if (rdev
->constraints
->initial_state
) {
987 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
989 rdev_err(rdev
, "failed to set suspend state\n");
994 if (rdev
->constraints
->initial_mode
) {
995 if (!ops
->set_mode
) {
996 rdev_err(rdev
, "no set_mode operation\n");
1001 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1003 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1008 /* If the constraints say the regulator should be on at this point
1009 * and we have control then make sure it is enabled.
1011 if ((rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) &&
1013 ret
= ops
->enable(rdev
);
1015 rdev_err(rdev
, "failed to enable\n");
1020 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1021 && ops
->set_ramp_delay
) {
1022 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1024 rdev_err(rdev
, "failed to set ramp_delay\n");
1029 print_constraints(rdev
);
1032 kfree(rdev
->constraints
);
1033 rdev
->constraints
= NULL
;
1038 * set_supply - set regulator supply regulator
1039 * @rdev: regulator name
1040 * @supply_rdev: supply regulator name
1042 * Called by platform initialisation code to set the supply regulator for this
1043 * regulator. This ensures that a regulators supply will also be enabled by the
1044 * core if it's child is enabled.
1046 static int set_supply(struct regulator_dev
*rdev
,
1047 struct regulator_dev
*supply_rdev
)
1051 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1053 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1054 if (rdev
->supply
== NULL
) {
1058 supply_rdev
->open_count
++;
1064 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1065 * @rdev: regulator source
1066 * @consumer_dev_name: dev_name() string for device supply applies to
1067 * @supply: symbolic name for supply
1069 * Allows platform initialisation code to map physical regulator
1070 * sources to symbolic names for supplies for use by devices. Devices
1071 * should use these symbolic names to request regulators, avoiding the
1072 * need to provide board-specific regulator names as platform data.
1074 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1075 const char *consumer_dev_name
,
1078 struct regulator_map
*node
;
1084 if (consumer_dev_name
!= NULL
)
1089 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1090 if (node
->dev_name
&& consumer_dev_name
) {
1091 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1093 } else if (node
->dev_name
|| consumer_dev_name
) {
1097 if (strcmp(node
->supply
, supply
) != 0)
1100 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1102 dev_name(&node
->regulator
->dev
),
1103 node
->regulator
->desc
->name
,
1105 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1109 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1113 node
->regulator
= rdev
;
1114 node
->supply
= supply
;
1117 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1118 if (node
->dev_name
== NULL
) {
1124 list_add(&node
->list
, ®ulator_map_list
);
1128 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1130 struct regulator_map
*node
, *n
;
1132 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1133 if (rdev
== node
->regulator
) {
1134 list_del(&node
->list
);
1135 kfree(node
->dev_name
);
1141 #define REG_STR_SIZE 64
1143 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1145 const char *supply_name
)
1147 struct regulator
*regulator
;
1148 char buf
[REG_STR_SIZE
];
1151 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1152 if (regulator
== NULL
)
1155 mutex_lock(&rdev
->mutex
);
1156 regulator
->rdev
= rdev
;
1157 list_add(®ulator
->list
, &rdev
->consumer_list
);
1160 regulator
->dev
= dev
;
1162 /* Add a link to the device sysfs entry */
1163 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1164 dev
->kobj
.name
, supply_name
);
1165 if (size
>= REG_STR_SIZE
)
1168 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1169 if (regulator
->supply_name
== NULL
)
1172 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1175 rdev_warn(rdev
, "could not add device link %s err %d\n",
1176 dev
->kobj
.name
, err
);
1180 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1181 if (regulator
->supply_name
== NULL
)
1185 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1187 if (!regulator
->debugfs
) {
1188 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1190 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1191 ®ulator
->uA_load
);
1192 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1193 ®ulator
->min_uV
);
1194 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1195 ®ulator
->max_uV
);
1199 * Check now if the regulator is an always on regulator - if
1200 * it is then we don't need to do nearly so much work for
1201 * enable/disable calls.
1203 if (!_regulator_can_change_status(rdev
) &&
1204 _regulator_is_enabled(rdev
))
1205 regulator
->always_on
= true;
1207 mutex_unlock(&rdev
->mutex
);
1210 list_del(®ulator
->list
);
1212 mutex_unlock(&rdev
->mutex
);
1216 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1218 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1219 return rdev
->constraints
->enable_time
;
1220 if (!rdev
->desc
->ops
->enable_time
)
1221 return rdev
->desc
->enable_time
;
1222 return rdev
->desc
->ops
->enable_time(rdev
);
1225 static struct regulator_supply_alias
*regulator_find_supply_alias(
1226 struct device
*dev
, const char *supply
)
1228 struct regulator_supply_alias
*map
;
1230 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1231 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1237 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1239 struct regulator_supply_alias
*map
;
1241 map
= regulator_find_supply_alias(*dev
, *supply
);
1243 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1244 *supply
, map
->alias_supply
,
1245 dev_name(map
->alias_dev
));
1246 *dev
= map
->alias_dev
;
1247 *supply
= map
->alias_supply
;
1251 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1255 struct regulator_dev
*r
;
1256 struct device_node
*node
;
1257 struct regulator_map
*map
;
1258 const char *devname
= NULL
;
1260 regulator_supply_alias(&dev
, &supply
);
1262 /* first do a dt based lookup */
1263 if (dev
&& dev
->of_node
) {
1264 node
= of_get_regulator(dev
, supply
);
1266 list_for_each_entry(r
, ®ulator_list
, list
)
1267 if (r
->dev
.parent
&&
1268 node
== r
->dev
.of_node
)
1272 * If we couldn't even get the node then it's
1273 * not just that the device didn't register
1274 * yet, there's no node and we'll never
1281 /* if not found, try doing it non-dt way */
1283 devname
= dev_name(dev
);
1285 list_for_each_entry(r
, ®ulator_list
, list
)
1286 if (strcmp(rdev_get_name(r
), supply
) == 0)
1289 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1290 /* If the mapping has a device set up it must match */
1291 if (map
->dev_name
&&
1292 (!devname
|| strcmp(map
->dev_name
, devname
)))
1295 if (strcmp(map
->supply
, supply
) == 0)
1296 return map
->regulator
;
1303 /* Internal regulator request function */
1304 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1305 bool exclusive
, bool allow_dummy
)
1307 struct regulator_dev
*rdev
;
1308 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1309 const char *devname
= NULL
;
1310 int ret
= -EPROBE_DEFER
;
1313 pr_err("get() with no identifier\n");
1314 return ERR_PTR(-EINVAL
);
1318 devname
= dev_name(dev
);
1320 mutex_lock(®ulator_list_mutex
);
1322 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1326 regulator
= ERR_PTR(ret
);
1329 * If we have return value from dev_lookup fail, we do not expect to
1330 * succeed, so, quit with appropriate error value
1332 if (ret
&& ret
!= -ENODEV
) {
1337 devname
= "deviceless";
1340 * Assume that a regulator is physically present and enabled
1341 * even if it isn't hooked up and just provide a dummy.
1343 if (has_full_constraints
&& allow_dummy
) {
1344 pr_warn("%s supply %s not found, using dummy regulator\n",
1347 rdev
= dummy_regulator_rdev
;
1350 dev_err(dev
, "dummy supplies not allowed\n");
1353 mutex_unlock(®ulator_list_mutex
);
1357 if (rdev
->exclusive
) {
1358 regulator
= ERR_PTR(-EPERM
);
1362 if (exclusive
&& rdev
->open_count
) {
1363 regulator
= ERR_PTR(-EBUSY
);
1367 if (!try_module_get(rdev
->owner
))
1370 regulator
= create_regulator(rdev
, dev
, id
);
1371 if (regulator
== NULL
) {
1372 regulator
= ERR_PTR(-ENOMEM
);
1373 module_put(rdev
->owner
);
1379 rdev
->exclusive
= 1;
1381 ret
= _regulator_is_enabled(rdev
);
1383 rdev
->use_count
= 1;
1385 rdev
->use_count
= 0;
1389 mutex_unlock(®ulator_list_mutex
);
1395 * regulator_get - lookup and obtain a reference to a regulator.
1396 * @dev: device for regulator "consumer"
1397 * @id: Supply name or regulator ID.
1399 * Returns a struct regulator corresponding to the regulator producer,
1400 * or IS_ERR() condition containing errno.
1402 * Use of supply names configured via regulator_set_device_supply() is
1403 * strongly encouraged. It is recommended that the supply name used
1404 * should match the name used for the supply and/or the relevant
1405 * device pins in the datasheet.
1407 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1409 return _regulator_get(dev
, id
, false, true);
1411 EXPORT_SYMBOL_GPL(regulator_get
);
1414 * regulator_get_exclusive - obtain exclusive access to a regulator.
1415 * @dev: device for regulator "consumer"
1416 * @id: Supply name or regulator ID.
1418 * Returns a struct regulator corresponding to the regulator producer,
1419 * or IS_ERR() condition containing errno. Other consumers will be
1420 * unable to obtain this reference is held and the use count for the
1421 * regulator will be initialised to reflect the current state of the
1424 * This is intended for use by consumers which cannot tolerate shared
1425 * use of the regulator such as those which need to force the
1426 * regulator off for correct operation of the hardware they are
1429 * Use of supply names configured via regulator_set_device_supply() is
1430 * strongly encouraged. It is recommended that the supply name used
1431 * should match the name used for the supply and/or the relevant
1432 * device pins in the datasheet.
1434 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1436 return _regulator_get(dev
, id
, true, false);
1438 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1441 * regulator_get_optional - obtain optional access to a regulator.
1442 * @dev: device for regulator "consumer"
1443 * @id: Supply name or regulator ID.
1445 * Returns a struct regulator corresponding to the regulator producer,
1446 * or IS_ERR() condition containing errno. Other consumers will be
1447 * unable to obtain this reference is held and the use count for the
1448 * regulator will be initialised to reflect the current state of the
1451 * This is intended for use by consumers for devices which can have
1452 * some supplies unconnected in normal use, such as some MMC devices.
1453 * It can allow the regulator core to provide stub supplies for other
1454 * supplies requested using normal regulator_get() calls without
1455 * disrupting the operation of drivers that can handle absent
1458 * Use of supply names configured via regulator_set_device_supply() is
1459 * strongly encouraged. It is recommended that the supply name used
1460 * should match the name used for the supply and/or the relevant
1461 * device pins in the datasheet.
1463 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1465 return _regulator_get(dev
, id
, false, false);
1467 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1469 /* Locks held by regulator_put() */
1470 static void _regulator_put(struct regulator
*regulator
)
1472 struct regulator_dev
*rdev
;
1474 if (regulator
== NULL
|| IS_ERR(regulator
))
1477 rdev
= regulator
->rdev
;
1479 debugfs_remove_recursive(regulator
->debugfs
);
1481 /* remove any sysfs entries */
1483 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1484 kfree(regulator
->supply_name
);
1485 list_del(®ulator
->list
);
1489 rdev
->exclusive
= 0;
1491 module_put(rdev
->owner
);
1495 * regulator_put - "free" the regulator source
1496 * @regulator: regulator source
1498 * Note: drivers must ensure that all regulator_enable calls made on this
1499 * regulator source are balanced by regulator_disable calls prior to calling
1502 void regulator_put(struct regulator
*regulator
)
1504 mutex_lock(®ulator_list_mutex
);
1505 _regulator_put(regulator
);
1506 mutex_unlock(®ulator_list_mutex
);
1508 EXPORT_SYMBOL_GPL(regulator_put
);
1511 * regulator_register_supply_alias - Provide device alias for supply lookup
1513 * @dev: device that will be given as the regulator "consumer"
1514 * @id: Supply name or regulator ID
1515 * @alias_dev: device that should be used to lookup the supply
1516 * @alias_id: Supply name or regulator ID that should be used to lookup the
1519 * All lookups for id on dev will instead be conducted for alias_id on
1522 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1523 struct device
*alias_dev
,
1524 const char *alias_id
)
1526 struct regulator_supply_alias
*map
;
1528 map
= regulator_find_supply_alias(dev
, id
);
1532 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1537 map
->src_supply
= id
;
1538 map
->alias_dev
= alias_dev
;
1539 map
->alias_supply
= alias_id
;
1541 list_add(&map
->list
, ®ulator_supply_alias_list
);
1543 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1544 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1548 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1551 * regulator_unregister_supply_alias - Remove device alias
1553 * @dev: device that will be given as the regulator "consumer"
1554 * @id: Supply name or regulator ID
1556 * Remove a lookup alias if one exists for id on dev.
1558 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1560 struct regulator_supply_alias
*map
;
1562 map
= regulator_find_supply_alias(dev
, id
);
1564 list_del(&map
->list
);
1568 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1571 * regulator_bulk_register_supply_alias - register multiple aliases
1573 * @dev: device that will be given as the regulator "consumer"
1574 * @id: List of supply names or regulator IDs
1575 * @alias_dev: device that should be used to lookup the supply
1576 * @alias_id: List of supply names or regulator IDs that should be used to
1578 * @num_id: Number of aliases to register
1580 * @return 0 on success, an errno on failure.
1582 * This helper function allows drivers to register several supply
1583 * aliases in one operation. If any of the aliases cannot be
1584 * registered any aliases that were registered will be removed
1585 * before returning to the caller.
1587 int regulator_bulk_register_supply_alias(struct device
*dev
, const char **id
,
1588 struct device
*alias_dev
,
1589 const char **alias_id
,
1595 for (i
= 0; i
< num_id
; ++i
) {
1596 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1606 "Failed to create supply alias %s,%s -> %s,%s\n",
1607 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1610 regulator_unregister_supply_alias(dev
, id
[i
]);
1614 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1617 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1619 * @dev: device that will be given as the regulator "consumer"
1620 * @id: List of supply names or regulator IDs
1621 * @num_id: Number of aliases to unregister
1623 * This helper function allows drivers to unregister several supply
1624 * aliases in one operation.
1626 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1632 for (i
= 0; i
< num_id
; ++i
)
1633 regulator_unregister_supply_alias(dev
, id
[i
]);
1635 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1638 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1639 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1640 const struct regulator_config
*config
)
1642 struct regulator_enable_gpio
*pin
;
1645 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1646 if (pin
->gpio
== config
->ena_gpio
) {
1647 rdev_dbg(rdev
, "GPIO %d is already used\n",
1649 goto update_ena_gpio_to_rdev
;
1653 ret
= gpio_request_one(config
->ena_gpio
,
1654 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1655 rdev_get_name(rdev
));
1659 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1661 gpio_free(config
->ena_gpio
);
1665 pin
->gpio
= config
->ena_gpio
;
1666 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1667 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1669 update_ena_gpio_to_rdev
:
1670 pin
->request_count
++;
1671 rdev
->ena_pin
= pin
;
1675 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1677 struct regulator_enable_gpio
*pin
, *n
;
1682 /* Free the GPIO only in case of no use */
1683 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1684 if (pin
->gpio
== rdev
->ena_pin
->gpio
) {
1685 if (pin
->request_count
<= 1) {
1686 pin
->request_count
= 0;
1687 gpio_free(pin
->gpio
);
1688 list_del(&pin
->list
);
1691 pin
->request_count
--;
1698 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1699 * @rdev: regulator_dev structure
1700 * @enable: enable GPIO at initial use?
1702 * GPIO is enabled in case of initial use. (enable_count is 0)
1703 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1705 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1707 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1713 /* Enable GPIO at initial use */
1714 if (pin
->enable_count
== 0)
1715 gpio_set_value_cansleep(pin
->gpio
,
1716 !pin
->ena_gpio_invert
);
1718 pin
->enable_count
++;
1720 if (pin
->enable_count
> 1) {
1721 pin
->enable_count
--;
1725 /* Disable GPIO if not used */
1726 if (pin
->enable_count
<= 1) {
1727 gpio_set_value_cansleep(pin
->gpio
,
1728 pin
->ena_gpio_invert
);
1729 pin
->enable_count
= 0;
1736 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1740 /* Query before enabling in case configuration dependent. */
1741 ret
= _regulator_get_enable_time(rdev
);
1745 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1749 trace_regulator_enable(rdev_get_name(rdev
));
1751 if (rdev
->ena_pin
) {
1752 ret
= regulator_ena_gpio_ctrl(rdev
, true);
1755 rdev
->ena_gpio_state
= 1;
1756 } else if (rdev
->desc
->ops
->enable
) {
1757 ret
= rdev
->desc
->ops
->enable(rdev
);
1764 /* Allow the regulator to ramp; it would be useful to extend
1765 * this for bulk operations so that the regulators can ramp
1767 trace_regulator_enable_delay(rdev_get_name(rdev
));
1770 * Delay for the requested amount of time as per the guidelines in:
1772 * Documentation/timers/timers-howto.txt
1774 * The assumption here is that regulators will never be enabled in
1775 * atomic context and therefore sleeping functions can be used.
1778 unsigned int ms
= delay
/ 1000;
1779 unsigned int us
= delay
% 1000;
1783 * For small enough values, handle super-millisecond
1784 * delays in the usleep_range() call below.
1793 * Give the scheduler some room to coalesce with any other
1794 * wakeup sources. For delays shorter than 10 us, don't even
1795 * bother setting up high-resolution timers and just busy-
1799 usleep_range(us
, us
+ 100);
1804 trace_regulator_enable_complete(rdev_get_name(rdev
));
1809 /* locks held by regulator_enable() */
1810 static int _regulator_enable(struct regulator_dev
*rdev
)
1814 /* check voltage and requested load before enabling */
1815 if (rdev
->constraints
&&
1816 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1817 drms_uA_update(rdev
);
1819 if (rdev
->use_count
== 0) {
1820 /* The regulator may on if it's not switchable or left on */
1821 ret
= _regulator_is_enabled(rdev
);
1822 if (ret
== -EINVAL
|| ret
== 0) {
1823 if (!_regulator_can_change_status(rdev
))
1826 ret
= _regulator_do_enable(rdev
);
1830 } else if (ret
< 0) {
1831 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1834 /* Fallthrough on positive return values - already enabled */
1843 * regulator_enable - enable regulator output
1844 * @regulator: regulator source
1846 * Request that the regulator be enabled with the regulator output at
1847 * the predefined voltage or current value. Calls to regulator_enable()
1848 * must be balanced with calls to regulator_disable().
1850 * NOTE: the output value can be set by other drivers, boot loader or may be
1851 * hardwired in the regulator.
1853 int regulator_enable(struct regulator
*regulator
)
1855 struct regulator_dev
*rdev
= regulator
->rdev
;
1858 if (regulator
->always_on
)
1862 ret
= regulator_enable(rdev
->supply
);
1867 mutex_lock(&rdev
->mutex
);
1868 ret
= _regulator_enable(rdev
);
1869 mutex_unlock(&rdev
->mutex
);
1871 if (ret
!= 0 && rdev
->supply
)
1872 regulator_disable(rdev
->supply
);
1876 EXPORT_SYMBOL_GPL(regulator_enable
);
1878 static int _regulator_do_disable(struct regulator_dev
*rdev
)
1882 trace_regulator_disable(rdev_get_name(rdev
));
1884 if (rdev
->ena_pin
) {
1885 ret
= regulator_ena_gpio_ctrl(rdev
, false);
1888 rdev
->ena_gpio_state
= 0;
1890 } else if (rdev
->desc
->ops
->disable
) {
1891 ret
= rdev
->desc
->ops
->disable(rdev
);
1896 trace_regulator_disable_complete(rdev_get_name(rdev
));
1898 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1903 /* locks held by regulator_disable() */
1904 static int _regulator_disable(struct regulator_dev
*rdev
)
1908 if (WARN(rdev
->use_count
<= 0,
1909 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1912 /* are we the last user and permitted to disable ? */
1913 if (rdev
->use_count
== 1 &&
1914 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1916 /* we are last user */
1917 if (_regulator_can_change_status(rdev
)) {
1918 ret
= _regulator_do_disable(rdev
);
1920 rdev_err(rdev
, "failed to disable\n");
1925 rdev
->use_count
= 0;
1926 } else if (rdev
->use_count
> 1) {
1928 if (rdev
->constraints
&&
1929 (rdev
->constraints
->valid_ops_mask
&
1930 REGULATOR_CHANGE_DRMS
))
1931 drms_uA_update(rdev
);
1940 * regulator_disable - disable regulator output
1941 * @regulator: regulator source
1943 * Disable the regulator output voltage or current. Calls to
1944 * regulator_enable() must be balanced with calls to
1945 * regulator_disable().
1947 * NOTE: this will only disable the regulator output if no other consumer
1948 * devices have it enabled, the regulator device supports disabling and
1949 * machine constraints permit this operation.
1951 int regulator_disable(struct regulator
*regulator
)
1953 struct regulator_dev
*rdev
= regulator
->rdev
;
1956 if (regulator
->always_on
)
1959 mutex_lock(&rdev
->mutex
);
1960 ret
= _regulator_disable(rdev
);
1961 mutex_unlock(&rdev
->mutex
);
1963 if (ret
== 0 && rdev
->supply
)
1964 regulator_disable(rdev
->supply
);
1968 EXPORT_SYMBOL_GPL(regulator_disable
);
1970 /* locks held by regulator_force_disable() */
1971 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1976 if (rdev
->desc
->ops
->disable
) {
1977 /* ah well, who wants to live forever... */
1978 ret
= rdev
->desc
->ops
->disable(rdev
);
1980 rdev_err(rdev
, "failed to force disable\n");
1983 /* notify other consumers that power has been forced off */
1984 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1985 REGULATOR_EVENT_DISABLE
, NULL
);
1992 * regulator_force_disable - force disable regulator output
1993 * @regulator: regulator source
1995 * Forcibly disable the regulator output voltage or current.
1996 * NOTE: this *will* disable the regulator output even if other consumer
1997 * devices have it enabled. This should be used for situations when device
1998 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2000 int regulator_force_disable(struct regulator
*regulator
)
2002 struct regulator_dev
*rdev
= regulator
->rdev
;
2005 mutex_lock(&rdev
->mutex
);
2006 regulator
->uA_load
= 0;
2007 ret
= _regulator_force_disable(regulator
->rdev
);
2008 mutex_unlock(&rdev
->mutex
);
2011 while (rdev
->open_count
--)
2012 regulator_disable(rdev
->supply
);
2016 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2018 static void regulator_disable_work(struct work_struct
*work
)
2020 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2024 mutex_lock(&rdev
->mutex
);
2026 BUG_ON(!rdev
->deferred_disables
);
2028 count
= rdev
->deferred_disables
;
2029 rdev
->deferred_disables
= 0;
2031 for (i
= 0; i
< count
; i
++) {
2032 ret
= _regulator_disable(rdev
);
2034 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2037 mutex_unlock(&rdev
->mutex
);
2040 for (i
= 0; i
< count
; i
++) {
2041 ret
= regulator_disable(rdev
->supply
);
2044 "Supply disable failed: %d\n", ret
);
2051 * regulator_disable_deferred - disable regulator output with delay
2052 * @regulator: regulator source
2053 * @ms: miliseconds until the regulator is disabled
2055 * Execute regulator_disable() on the regulator after a delay. This
2056 * is intended for use with devices that require some time to quiesce.
2058 * NOTE: this will only disable the regulator output if no other consumer
2059 * devices have it enabled, the regulator device supports disabling and
2060 * machine constraints permit this operation.
2062 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2064 struct regulator_dev
*rdev
= regulator
->rdev
;
2067 if (regulator
->always_on
)
2071 return regulator_disable(regulator
);
2073 mutex_lock(&rdev
->mutex
);
2074 rdev
->deferred_disables
++;
2075 mutex_unlock(&rdev
->mutex
);
2077 ret
= queue_delayed_work(system_power_efficient_wq
,
2078 &rdev
->disable_work
,
2079 msecs_to_jiffies(ms
));
2085 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2087 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2089 /* A GPIO control always takes precedence */
2091 return rdev
->ena_gpio_state
;
2093 /* If we don't know then assume that the regulator is always on */
2094 if (!rdev
->desc
->ops
->is_enabled
)
2097 return rdev
->desc
->ops
->is_enabled(rdev
);
2101 * regulator_is_enabled - is the regulator output enabled
2102 * @regulator: regulator source
2104 * Returns positive if the regulator driver backing the source/client
2105 * has requested that the device be enabled, zero if it hasn't, else a
2106 * negative errno code.
2108 * Note that the device backing this regulator handle can have multiple
2109 * users, so it might be enabled even if regulator_enable() was never
2110 * called for this particular source.
2112 int regulator_is_enabled(struct regulator
*regulator
)
2116 if (regulator
->always_on
)
2119 mutex_lock(®ulator
->rdev
->mutex
);
2120 ret
= _regulator_is_enabled(regulator
->rdev
);
2121 mutex_unlock(®ulator
->rdev
->mutex
);
2125 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2128 * regulator_can_change_voltage - check if regulator can change voltage
2129 * @regulator: regulator source
2131 * Returns positive if the regulator driver backing the source/client
2132 * can change its voltage, false otherwise. Usefull for detecting fixed
2133 * or dummy regulators and disabling voltage change logic in the client
2136 int regulator_can_change_voltage(struct regulator
*regulator
)
2138 struct regulator_dev
*rdev
= regulator
->rdev
;
2140 if (rdev
->constraints
&&
2141 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2142 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2145 if (rdev
->desc
->continuous_voltage_range
&&
2146 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2147 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2153 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2156 * regulator_count_voltages - count regulator_list_voltage() selectors
2157 * @regulator: regulator source
2159 * Returns number of selectors, or negative errno. Selectors are
2160 * numbered starting at zero, and typically correspond to bitfields
2161 * in hardware registers.
2163 int regulator_count_voltages(struct regulator
*regulator
)
2165 struct regulator_dev
*rdev
= regulator
->rdev
;
2167 return rdev
->desc
->n_voltages
? : -EINVAL
;
2169 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2172 * regulator_list_voltage - enumerate supported voltages
2173 * @regulator: regulator source
2174 * @selector: identify voltage to list
2175 * Context: can sleep
2177 * Returns a voltage that can be passed to @regulator_set_voltage(),
2178 * zero if this selector code can't be used on this system, or a
2181 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2183 struct regulator_dev
*rdev
= regulator
->rdev
;
2184 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2187 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2188 return rdev
->desc
->fixed_uV
;
2190 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
2193 mutex_lock(&rdev
->mutex
);
2194 ret
= ops
->list_voltage(rdev
, selector
);
2195 mutex_unlock(&rdev
->mutex
);
2198 if (ret
< rdev
->constraints
->min_uV
)
2200 else if (ret
> rdev
->constraints
->max_uV
)
2206 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2209 * regulator_get_linear_step - return the voltage step size between VSEL values
2210 * @regulator: regulator source
2212 * Returns the voltage step size between VSEL values for linear
2213 * regulators, or return 0 if the regulator isn't a linear regulator.
2215 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2217 struct regulator_dev
*rdev
= regulator
->rdev
;
2219 return rdev
->desc
->uV_step
;
2221 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2224 * regulator_is_supported_voltage - check if a voltage range can be supported
2226 * @regulator: Regulator to check.
2227 * @min_uV: Minimum required voltage in uV.
2228 * @max_uV: Maximum required voltage in uV.
2230 * Returns a boolean or a negative error code.
2232 int regulator_is_supported_voltage(struct regulator
*regulator
,
2233 int min_uV
, int max_uV
)
2235 struct regulator_dev
*rdev
= regulator
->rdev
;
2236 int i
, voltages
, ret
;
2238 /* If we can't change voltage check the current voltage */
2239 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2240 ret
= regulator_get_voltage(regulator
);
2242 return (min_uV
<= ret
&& ret
<= max_uV
);
2247 /* Any voltage within constrains range is fine? */
2248 if (rdev
->desc
->continuous_voltage_range
)
2249 return min_uV
>= rdev
->constraints
->min_uV
&&
2250 max_uV
<= rdev
->constraints
->max_uV
;
2252 ret
= regulator_count_voltages(regulator
);
2257 for (i
= 0; i
< voltages
; i
++) {
2258 ret
= regulator_list_voltage(regulator
, i
);
2260 if (ret
>= min_uV
&& ret
<= max_uV
)
2266 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2268 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2269 int min_uV
, int max_uV
)
2274 unsigned int selector
;
2275 int old_selector
= -1;
2277 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2279 min_uV
+= rdev
->constraints
->uV_offset
;
2280 max_uV
+= rdev
->constraints
->uV_offset
;
2283 * If we can't obtain the old selector there is not enough
2284 * info to call set_voltage_time_sel().
2286 if (_regulator_is_enabled(rdev
) &&
2287 rdev
->desc
->ops
->set_voltage_time_sel
&&
2288 rdev
->desc
->ops
->get_voltage_sel
) {
2289 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2290 if (old_selector
< 0)
2291 return old_selector
;
2294 if (rdev
->desc
->ops
->set_voltage
) {
2295 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
,
2299 if (rdev
->desc
->ops
->list_voltage
)
2300 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2303 best_val
= _regulator_get_voltage(rdev
);
2306 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2307 if (rdev
->desc
->ops
->map_voltage
) {
2308 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2311 if (rdev
->desc
->ops
->list_voltage
==
2312 regulator_list_voltage_linear
)
2313 ret
= regulator_map_voltage_linear(rdev
,
2316 ret
= regulator_map_voltage_iterate(rdev
,
2321 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2322 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2324 if (old_selector
== selector
)
2327 ret
= rdev
->desc
->ops
->set_voltage_sel(
2337 /* Call set_voltage_time_sel if successfully obtained old_selector */
2338 if (ret
== 0 && !rdev
->constraints
->ramp_disable
&& old_selector
>= 0
2339 && old_selector
!= selector
) {
2341 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2342 old_selector
, selector
);
2344 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2349 /* Insert any necessary delays */
2350 if (delay
>= 1000) {
2351 mdelay(delay
/ 1000);
2352 udelay(delay
% 1000);
2358 if (ret
== 0 && best_val
>= 0) {
2359 unsigned long data
= best_val
;
2361 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2365 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2371 * regulator_set_voltage - set regulator output voltage
2372 * @regulator: regulator source
2373 * @min_uV: Minimum required voltage in uV
2374 * @max_uV: Maximum acceptable voltage in uV
2376 * Sets a voltage regulator to the desired output voltage. This can be set
2377 * during any regulator state. IOW, regulator can be disabled or enabled.
2379 * If the regulator is enabled then the voltage will change to the new value
2380 * immediately otherwise if the regulator is disabled the regulator will
2381 * output at the new voltage when enabled.
2383 * NOTE: If the regulator is shared between several devices then the lowest
2384 * request voltage that meets the system constraints will be used.
2385 * Regulator system constraints must be set for this regulator before
2386 * calling this function otherwise this call will fail.
2388 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2390 struct regulator_dev
*rdev
= regulator
->rdev
;
2392 int old_min_uV
, old_max_uV
;
2394 mutex_lock(&rdev
->mutex
);
2396 /* If we're setting the same range as last time the change
2397 * should be a noop (some cpufreq implementations use the same
2398 * voltage for multiple frequencies, for example).
2400 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2404 if (!rdev
->desc
->ops
->set_voltage
&&
2405 !rdev
->desc
->ops
->set_voltage_sel
) {
2410 /* constraints check */
2411 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2415 /* restore original values in case of error */
2416 old_min_uV
= regulator
->min_uV
;
2417 old_max_uV
= regulator
->max_uV
;
2418 regulator
->min_uV
= min_uV
;
2419 regulator
->max_uV
= max_uV
;
2421 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2425 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2430 mutex_unlock(&rdev
->mutex
);
2433 regulator
->min_uV
= old_min_uV
;
2434 regulator
->max_uV
= old_max_uV
;
2435 mutex_unlock(&rdev
->mutex
);
2438 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2441 * regulator_set_voltage_time - get raise/fall time
2442 * @regulator: regulator source
2443 * @old_uV: starting voltage in microvolts
2444 * @new_uV: target voltage in microvolts
2446 * Provided with the starting and ending voltage, this function attempts to
2447 * calculate the time in microseconds required to rise or fall to this new
2450 int regulator_set_voltage_time(struct regulator
*regulator
,
2451 int old_uV
, int new_uV
)
2453 struct regulator_dev
*rdev
= regulator
->rdev
;
2454 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2460 /* Currently requires operations to do this */
2461 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2462 || !rdev
->desc
->n_voltages
)
2465 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2466 /* We only look for exact voltage matches here */
2467 voltage
= regulator_list_voltage(regulator
, i
);
2472 if (voltage
== old_uV
)
2474 if (voltage
== new_uV
)
2478 if (old_sel
< 0 || new_sel
< 0)
2481 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2483 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2486 * regulator_set_voltage_time_sel - get raise/fall time
2487 * @rdev: regulator source device
2488 * @old_selector: selector for starting voltage
2489 * @new_selector: selector for target voltage
2491 * Provided with the starting and target voltage selectors, this function
2492 * returns time in microseconds required to rise or fall to this new voltage
2494 * Drivers providing ramp_delay in regulation_constraints can use this as their
2495 * set_voltage_time_sel() operation.
2497 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2498 unsigned int old_selector
,
2499 unsigned int new_selector
)
2501 unsigned int ramp_delay
= 0;
2502 int old_volt
, new_volt
;
2504 if (rdev
->constraints
->ramp_delay
)
2505 ramp_delay
= rdev
->constraints
->ramp_delay
;
2506 else if (rdev
->desc
->ramp_delay
)
2507 ramp_delay
= rdev
->desc
->ramp_delay
;
2509 if (ramp_delay
== 0) {
2510 rdev_warn(rdev
, "ramp_delay not set\n");
2515 if (!rdev
->desc
->ops
->list_voltage
)
2518 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2519 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2521 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2523 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2526 * regulator_sync_voltage - re-apply last regulator output voltage
2527 * @regulator: regulator source
2529 * Re-apply the last configured voltage. This is intended to be used
2530 * where some external control source the consumer is cooperating with
2531 * has caused the configured voltage to change.
2533 int regulator_sync_voltage(struct regulator
*regulator
)
2535 struct regulator_dev
*rdev
= regulator
->rdev
;
2536 int ret
, min_uV
, max_uV
;
2538 mutex_lock(&rdev
->mutex
);
2540 if (!rdev
->desc
->ops
->set_voltage
&&
2541 !rdev
->desc
->ops
->set_voltage_sel
) {
2546 /* This is only going to work if we've had a voltage configured. */
2547 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2552 min_uV
= regulator
->min_uV
;
2553 max_uV
= regulator
->max_uV
;
2555 /* This should be a paranoia check... */
2556 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2560 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2564 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2567 mutex_unlock(&rdev
->mutex
);
2570 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2572 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2576 if (rdev
->desc
->ops
->get_voltage_sel
) {
2577 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2580 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2581 } else if (rdev
->desc
->ops
->get_voltage
) {
2582 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2583 } else if (rdev
->desc
->ops
->list_voltage
) {
2584 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2585 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
2586 ret
= rdev
->desc
->fixed_uV
;
2593 return ret
- rdev
->constraints
->uV_offset
;
2597 * regulator_get_voltage - get regulator output voltage
2598 * @regulator: regulator source
2600 * This returns the current regulator voltage in uV.
2602 * NOTE: If the regulator is disabled it will return the voltage value. This
2603 * function should not be used to determine regulator state.
2605 int regulator_get_voltage(struct regulator
*regulator
)
2609 mutex_lock(®ulator
->rdev
->mutex
);
2611 ret
= _regulator_get_voltage(regulator
->rdev
);
2613 mutex_unlock(®ulator
->rdev
->mutex
);
2617 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2620 * regulator_set_current_limit - set regulator output current limit
2621 * @regulator: regulator source
2622 * @min_uA: Minimum supported current in uA
2623 * @max_uA: Maximum supported current in uA
2625 * Sets current sink to the desired output current. This can be set during
2626 * any regulator state. IOW, regulator can be disabled or enabled.
2628 * If the regulator is enabled then the current will change to the new value
2629 * immediately otherwise if the regulator is disabled the regulator will
2630 * output at the new current when enabled.
2632 * NOTE: Regulator system constraints must be set for this regulator before
2633 * calling this function otherwise this call will fail.
2635 int regulator_set_current_limit(struct regulator
*regulator
,
2636 int min_uA
, int max_uA
)
2638 struct regulator_dev
*rdev
= regulator
->rdev
;
2641 mutex_lock(&rdev
->mutex
);
2644 if (!rdev
->desc
->ops
->set_current_limit
) {
2649 /* constraints check */
2650 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2654 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2656 mutex_unlock(&rdev
->mutex
);
2659 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2661 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2665 mutex_lock(&rdev
->mutex
);
2668 if (!rdev
->desc
->ops
->get_current_limit
) {
2673 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2675 mutex_unlock(&rdev
->mutex
);
2680 * regulator_get_current_limit - get regulator output current
2681 * @regulator: regulator source
2683 * This returns the current supplied by the specified current sink in uA.
2685 * NOTE: If the regulator is disabled it will return the current value. This
2686 * function should not be used to determine regulator state.
2688 int regulator_get_current_limit(struct regulator
*regulator
)
2690 return _regulator_get_current_limit(regulator
->rdev
);
2692 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2695 * regulator_set_mode - set regulator operating mode
2696 * @regulator: regulator source
2697 * @mode: operating mode - one of the REGULATOR_MODE constants
2699 * Set regulator operating mode to increase regulator efficiency or improve
2700 * regulation performance.
2702 * NOTE: Regulator system constraints must be set for this regulator before
2703 * calling this function otherwise this call will fail.
2705 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2707 struct regulator_dev
*rdev
= regulator
->rdev
;
2709 int regulator_curr_mode
;
2711 mutex_lock(&rdev
->mutex
);
2714 if (!rdev
->desc
->ops
->set_mode
) {
2719 /* return if the same mode is requested */
2720 if (rdev
->desc
->ops
->get_mode
) {
2721 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2722 if (regulator_curr_mode
== mode
) {
2728 /* constraints check */
2729 ret
= regulator_mode_constrain(rdev
, &mode
);
2733 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2735 mutex_unlock(&rdev
->mutex
);
2738 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2740 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2744 mutex_lock(&rdev
->mutex
);
2747 if (!rdev
->desc
->ops
->get_mode
) {
2752 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2754 mutex_unlock(&rdev
->mutex
);
2759 * regulator_get_mode - get regulator operating mode
2760 * @regulator: regulator source
2762 * Get the current regulator operating mode.
2764 unsigned int regulator_get_mode(struct regulator
*regulator
)
2766 return _regulator_get_mode(regulator
->rdev
);
2768 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2771 * regulator_set_optimum_mode - set regulator optimum operating mode
2772 * @regulator: regulator source
2773 * @uA_load: load current
2775 * Notifies the regulator core of a new device load. This is then used by
2776 * DRMS (if enabled by constraints) to set the most efficient regulator
2777 * operating mode for the new regulator loading.
2779 * Consumer devices notify their supply regulator of the maximum power
2780 * they will require (can be taken from device datasheet in the power
2781 * consumption tables) when they change operational status and hence power
2782 * state. Examples of operational state changes that can affect power
2783 * consumption are :-
2785 * o Device is opened / closed.
2786 * o Device I/O is about to begin or has just finished.
2787 * o Device is idling in between work.
2789 * This information is also exported via sysfs to userspace.
2791 * DRMS will sum the total requested load on the regulator and change
2792 * to the most efficient operating mode if platform constraints allow.
2794 * Returns the new regulator mode or error.
2796 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
2798 struct regulator_dev
*rdev
= regulator
->rdev
;
2799 struct regulator
*consumer
;
2800 int ret
, output_uV
, input_uV
= 0, total_uA_load
= 0;
2804 input_uV
= regulator_get_voltage(rdev
->supply
);
2806 mutex_lock(&rdev
->mutex
);
2809 * first check to see if we can set modes at all, otherwise just
2810 * tell the consumer everything is OK.
2812 regulator
->uA_load
= uA_load
;
2813 ret
= regulator_check_drms(rdev
);
2819 if (!rdev
->desc
->ops
->get_optimum_mode
)
2823 * we can actually do this so any errors are indicators of
2824 * potential real failure.
2828 if (!rdev
->desc
->ops
->set_mode
)
2831 /* get output voltage */
2832 output_uV
= _regulator_get_voltage(rdev
);
2833 if (output_uV
<= 0) {
2834 rdev_err(rdev
, "invalid output voltage found\n");
2838 /* No supply? Use constraint voltage */
2840 input_uV
= rdev
->constraints
->input_uV
;
2841 if (input_uV
<= 0) {
2842 rdev_err(rdev
, "invalid input voltage found\n");
2846 /* calc total requested load for this regulator */
2847 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
2848 total_uA_load
+= consumer
->uA_load
;
2850 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
2851 input_uV
, output_uV
,
2853 ret
= regulator_mode_constrain(rdev
, &mode
);
2855 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2856 total_uA_load
, input_uV
, output_uV
);
2860 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2862 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
2867 mutex_unlock(&rdev
->mutex
);
2870 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
2873 * regulator_allow_bypass - allow the regulator to go into bypass mode
2875 * @regulator: Regulator to configure
2876 * @enable: enable or disable bypass mode
2878 * Allow the regulator to go into bypass mode if all other consumers
2879 * for the regulator also enable bypass mode and the machine
2880 * constraints allow this. Bypass mode means that the regulator is
2881 * simply passing the input directly to the output with no regulation.
2883 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
2885 struct regulator_dev
*rdev
= regulator
->rdev
;
2888 if (!rdev
->desc
->ops
->set_bypass
)
2891 if (rdev
->constraints
&&
2892 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
2895 mutex_lock(&rdev
->mutex
);
2897 if (enable
&& !regulator
->bypass
) {
2898 rdev
->bypass_count
++;
2900 if (rdev
->bypass_count
== rdev
->open_count
) {
2901 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2903 rdev
->bypass_count
--;
2906 } else if (!enable
&& regulator
->bypass
) {
2907 rdev
->bypass_count
--;
2909 if (rdev
->bypass_count
!= rdev
->open_count
) {
2910 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2912 rdev
->bypass_count
++;
2917 regulator
->bypass
= enable
;
2919 mutex_unlock(&rdev
->mutex
);
2923 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
2926 * regulator_register_notifier - register regulator event notifier
2927 * @regulator: regulator source
2928 * @nb: notifier block
2930 * Register notifier block to receive regulator events.
2932 int regulator_register_notifier(struct regulator
*regulator
,
2933 struct notifier_block
*nb
)
2935 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
2938 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
2941 * regulator_unregister_notifier - unregister regulator event notifier
2942 * @regulator: regulator source
2943 * @nb: notifier block
2945 * Unregister regulator event notifier block.
2947 int regulator_unregister_notifier(struct regulator
*regulator
,
2948 struct notifier_block
*nb
)
2950 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
2953 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
2955 /* notify regulator consumers and downstream regulator consumers.
2956 * Note mutex must be held by caller.
2958 static void _notifier_call_chain(struct regulator_dev
*rdev
,
2959 unsigned long event
, void *data
)
2961 /* call rdev chain first */
2962 blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
2966 * regulator_bulk_get - get multiple regulator consumers
2968 * @dev: Device to supply
2969 * @num_consumers: Number of consumers to register
2970 * @consumers: Configuration of consumers; clients are stored here.
2972 * @return 0 on success, an errno on failure.
2974 * This helper function allows drivers to get several regulator
2975 * consumers in one operation. If any of the regulators cannot be
2976 * acquired then any regulators that were allocated will be freed
2977 * before returning to the caller.
2979 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
2980 struct regulator_bulk_data
*consumers
)
2985 for (i
= 0; i
< num_consumers
; i
++)
2986 consumers
[i
].consumer
= NULL
;
2988 for (i
= 0; i
< num_consumers
; i
++) {
2989 consumers
[i
].consumer
= regulator_get(dev
,
2990 consumers
[i
].supply
);
2991 if (IS_ERR(consumers
[i
].consumer
)) {
2992 ret
= PTR_ERR(consumers
[i
].consumer
);
2993 dev_err(dev
, "Failed to get supply '%s': %d\n",
2994 consumers
[i
].supply
, ret
);
2995 consumers
[i
].consumer
= NULL
;
3004 regulator_put(consumers
[i
].consumer
);
3008 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3010 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3012 struct regulator_bulk_data
*bulk
= data
;
3014 bulk
->ret
= regulator_enable(bulk
->consumer
);
3018 * regulator_bulk_enable - enable multiple regulator consumers
3020 * @num_consumers: Number of consumers
3021 * @consumers: Consumer data; clients are stored here.
3022 * @return 0 on success, an errno on failure
3024 * This convenience API allows consumers to enable multiple regulator
3025 * clients in a single API call. If any consumers cannot be enabled
3026 * then any others that were enabled will be disabled again prior to
3029 int regulator_bulk_enable(int num_consumers
,
3030 struct regulator_bulk_data
*consumers
)
3032 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3036 for (i
= 0; i
< num_consumers
; i
++) {
3037 if (consumers
[i
].consumer
->always_on
)
3038 consumers
[i
].ret
= 0;
3040 async_schedule_domain(regulator_bulk_enable_async
,
3041 &consumers
[i
], &async_domain
);
3044 async_synchronize_full_domain(&async_domain
);
3046 /* If any consumer failed we need to unwind any that succeeded */
3047 for (i
= 0; i
< num_consumers
; i
++) {
3048 if (consumers
[i
].ret
!= 0) {
3049 ret
= consumers
[i
].ret
;
3057 for (i
= 0; i
< num_consumers
; i
++) {
3058 if (consumers
[i
].ret
< 0)
3059 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3062 regulator_disable(consumers
[i
].consumer
);
3067 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3070 * regulator_bulk_disable - disable multiple regulator consumers
3072 * @num_consumers: Number of consumers
3073 * @consumers: Consumer data; clients are stored here.
3074 * @return 0 on success, an errno on failure
3076 * This convenience API allows consumers to disable multiple regulator
3077 * clients in a single API call. If any consumers cannot be disabled
3078 * then any others that were disabled will be enabled again prior to
3081 int regulator_bulk_disable(int num_consumers
,
3082 struct regulator_bulk_data
*consumers
)
3087 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3088 ret
= regulator_disable(consumers
[i
].consumer
);
3096 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3097 for (++i
; i
< num_consumers
; ++i
) {
3098 r
= regulator_enable(consumers
[i
].consumer
);
3100 pr_err("Failed to reename %s: %d\n",
3101 consumers
[i
].supply
, r
);
3106 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3109 * regulator_bulk_force_disable - force disable multiple regulator consumers
3111 * @num_consumers: Number of consumers
3112 * @consumers: Consumer data; clients are stored here.
3113 * @return 0 on success, an errno on failure
3115 * This convenience API allows consumers to forcibly disable multiple regulator
3116 * clients in a single API call.
3117 * NOTE: This should be used for situations when device damage will
3118 * likely occur if the regulators are not disabled (e.g. over temp).
3119 * Although regulator_force_disable function call for some consumers can
3120 * return error numbers, the function is called for all consumers.
3122 int regulator_bulk_force_disable(int num_consumers
,
3123 struct regulator_bulk_data
*consumers
)
3128 for (i
= 0; i
< num_consumers
; i
++)
3130 regulator_force_disable(consumers
[i
].consumer
);
3132 for (i
= 0; i
< num_consumers
; i
++) {
3133 if (consumers
[i
].ret
!= 0) {
3134 ret
= consumers
[i
].ret
;
3143 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3146 * regulator_bulk_free - free multiple regulator consumers
3148 * @num_consumers: Number of consumers
3149 * @consumers: Consumer data; clients are stored here.
3151 * This convenience API allows consumers to free multiple regulator
3152 * clients in a single API call.
3154 void regulator_bulk_free(int num_consumers
,
3155 struct regulator_bulk_data
*consumers
)
3159 for (i
= 0; i
< num_consumers
; i
++) {
3160 regulator_put(consumers
[i
].consumer
);
3161 consumers
[i
].consumer
= NULL
;
3164 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3167 * regulator_notifier_call_chain - call regulator event notifier
3168 * @rdev: regulator source
3169 * @event: notifier block
3170 * @data: callback-specific data.
3172 * Called by regulator drivers to notify clients a regulator event has
3173 * occurred. We also notify regulator clients downstream.
3174 * Note lock must be held by caller.
3176 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3177 unsigned long event
, void *data
)
3179 _notifier_call_chain(rdev
, event
, data
);
3183 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3186 * regulator_mode_to_status - convert a regulator mode into a status
3188 * @mode: Mode to convert
3190 * Convert a regulator mode into a status.
3192 int regulator_mode_to_status(unsigned int mode
)
3195 case REGULATOR_MODE_FAST
:
3196 return REGULATOR_STATUS_FAST
;
3197 case REGULATOR_MODE_NORMAL
:
3198 return REGULATOR_STATUS_NORMAL
;
3199 case REGULATOR_MODE_IDLE
:
3200 return REGULATOR_STATUS_IDLE
;
3201 case REGULATOR_MODE_STANDBY
:
3202 return REGULATOR_STATUS_STANDBY
;
3204 return REGULATOR_STATUS_UNDEFINED
;
3207 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3210 * To avoid cluttering sysfs (and memory) with useless state, only
3211 * create attributes that can be meaningfully displayed.
3213 static int add_regulator_attributes(struct regulator_dev
*rdev
)
3215 struct device
*dev
= &rdev
->dev
;
3216 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3219 /* some attributes need specific methods to be displayed */
3220 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3221 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3222 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3223 (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1))) {
3224 status
= device_create_file(dev
, &dev_attr_microvolts
);
3228 if (ops
->get_current_limit
) {
3229 status
= device_create_file(dev
, &dev_attr_microamps
);
3233 if (ops
->get_mode
) {
3234 status
= device_create_file(dev
, &dev_attr_opmode
);
3238 if (rdev
->ena_pin
|| ops
->is_enabled
) {
3239 status
= device_create_file(dev
, &dev_attr_state
);
3243 if (ops
->get_status
) {
3244 status
= device_create_file(dev
, &dev_attr_status
);
3248 if (ops
->get_bypass
) {
3249 status
= device_create_file(dev
, &dev_attr_bypass
);
3254 /* some attributes are type-specific */
3255 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
3256 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
3261 /* all the other attributes exist to support constraints;
3262 * don't show them if there are no constraints, or if the
3263 * relevant supporting methods are missing.
3265 if (!rdev
->constraints
)
3268 /* constraints need specific supporting methods */
3269 if (ops
->set_voltage
|| ops
->set_voltage_sel
) {
3270 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
3273 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
3277 if (ops
->set_current_limit
) {
3278 status
= device_create_file(dev
, &dev_attr_min_microamps
);
3281 status
= device_create_file(dev
, &dev_attr_max_microamps
);
3286 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
3289 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
3292 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
3296 if (ops
->set_suspend_voltage
) {
3297 status
= device_create_file(dev
,
3298 &dev_attr_suspend_standby_microvolts
);
3301 status
= device_create_file(dev
,
3302 &dev_attr_suspend_mem_microvolts
);
3305 status
= device_create_file(dev
,
3306 &dev_attr_suspend_disk_microvolts
);
3311 if (ops
->set_suspend_mode
) {
3312 status
= device_create_file(dev
,
3313 &dev_attr_suspend_standby_mode
);
3316 status
= device_create_file(dev
,
3317 &dev_attr_suspend_mem_mode
);
3320 status
= device_create_file(dev
,
3321 &dev_attr_suspend_disk_mode
);
3329 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3331 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3332 if (!rdev
->debugfs
) {
3333 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3337 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3339 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3341 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3342 &rdev
->bypass_count
);
3346 * regulator_register - register regulator
3347 * @regulator_desc: regulator to register
3348 * @config: runtime configuration for regulator
3350 * Called by regulator drivers to register a regulator.
3351 * Returns a valid pointer to struct regulator_dev on success
3352 * or an ERR_PTR() on error.
3354 struct regulator_dev
*
3355 regulator_register(const struct regulator_desc
*regulator_desc
,
3356 const struct regulator_config
*config
)
3358 const struct regulation_constraints
*constraints
= NULL
;
3359 const struct regulator_init_data
*init_data
;
3360 static atomic_t regulator_no
= ATOMIC_INIT(0);
3361 struct regulator_dev
*rdev
;
3364 const char *supply
= NULL
;
3366 if (regulator_desc
== NULL
|| config
== NULL
)
3367 return ERR_PTR(-EINVAL
);
3372 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3373 return ERR_PTR(-EINVAL
);
3375 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3376 regulator_desc
->type
!= REGULATOR_CURRENT
)
3377 return ERR_PTR(-EINVAL
);
3379 /* Only one of each should be implemented */
3380 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3381 regulator_desc
->ops
->get_voltage_sel
);
3382 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3383 regulator_desc
->ops
->set_voltage_sel
);
3385 /* If we're using selectors we must implement list_voltage. */
3386 if (regulator_desc
->ops
->get_voltage_sel
&&
3387 !regulator_desc
->ops
->list_voltage
) {
3388 return ERR_PTR(-EINVAL
);
3390 if (regulator_desc
->ops
->set_voltage_sel
&&
3391 !regulator_desc
->ops
->list_voltage
) {
3392 return ERR_PTR(-EINVAL
);
3395 init_data
= config
->init_data
;
3397 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3399 return ERR_PTR(-ENOMEM
);
3401 mutex_lock(®ulator_list_mutex
);
3403 mutex_init(&rdev
->mutex
);
3404 rdev
->reg_data
= config
->driver_data
;
3405 rdev
->owner
= regulator_desc
->owner
;
3406 rdev
->desc
= regulator_desc
;
3408 rdev
->regmap
= config
->regmap
;
3409 else if (dev_get_regmap(dev
, NULL
))
3410 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3411 else if (dev
->parent
)
3412 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3413 INIT_LIST_HEAD(&rdev
->consumer_list
);
3414 INIT_LIST_HEAD(&rdev
->list
);
3415 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3416 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3418 /* preform any regulator specific init */
3419 if (init_data
&& init_data
->regulator_init
) {
3420 ret
= init_data
->regulator_init(rdev
->reg_data
);
3425 /* register with sysfs */
3426 rdev
->dev
.class = ®ulator_class
;
3427 rdev
->dev
.of_node
= config
->of_node
;
3428 rdev
->dev
.parent
= dev
;
3429 dev_set_name(&rdev
->dev
, "regulator.%d",
3430 atomic_inc_return(®ulator_no
) - 1);
3431 ret
= device_register(&rdev
->dev
);
3433 put_device(&rdev
->dev
);
3437 dev_set_drvdata(&rdev
->dev
, rdev
);
3439 if (config
->ena_gpio
&& gpio_is_valid(config
->ena_gpio
)) {
3440 ret
= regulator_ena_gpio_request(rdev
, config
);
3442 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3443 config
->ena_gpio
, ret
);
3447 if (config
->ena_gpio_flags
& GPIOF_OUT_INIT_HIGH
)
3448 rdev
->ena_gpio_state
= 1;
3450 if (config
->ena_gpio_invert
)
3451 rdev
->ena_gpio_state
= !rdev
->ena_gpio_state
;
3454 /* set regulator constraints */
3456 constraints
= &init_data
->constraints
;
3458 ret
= set_machine_constraints(rdev
, constraints
);
3462 /* add attributes supported by this regulator */
3463 ret
= add_regulator_attributes(rdev
);
3467 if (init_data
&& init_data
->supply_regulator
)
3468 supply
= init_data
->supply_regulator
;
3469 else if (regulator_desc
->supply_name
)
3470 supply
= regulator_desc
->supply_name
;
3473 struct regulator_dev
*r
;
3475 r
= regulator_dev_lookup(dev
, supply
, &ret
);
3477 if (ret
== -ENODEV
) {
3479 * No supply was specified for this regulator and
3480 * there will never be one.
3485 dev_err(dev
, "Failed to find supply %s\n", supply
);
3486 ret
= -EPROBE_DEFER
;
3490 ret
= set_supply(rdev
, r
);
3494 /* Enable supply if rail is enabled */
3495 if (_regulator_is_enabled(rdev
)) {
3496 ret
= regulator_enable(rdev
->supply
);
3503 /* add consumers devices */
3505 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3506 ret
= set_consumer_device_supply(rdev
,
3507 init_data
->consumer_supplies
[i
].dev_name
,
3508 init_data
->consumer_supplies
[i
].supply
);
3510 dev_err(dev
, "Failed to set supply %s\n",
3511 init_data
->consumer_supplies
[i
].supply
);
3512 goto unset_supplies
;
3517 list_add(&rdev
->list
, ®ulator_list
);
3519 rdev_init_debugfs(rdev
);
3521 mutex_unlock(®ulator_list_mutex
);
3525 unset_regulator_supplies(rdev
);
3529 _regulator_put(rdev
->supply
);
3530 regulator_ena_gpio_free(rdev
);
3531 kfree(rdev
->constraints
);
3533 device_unregister(&rdev
->dev
);
3534 /* device core frees rdev */
3535 rdev
= ERR_PTR(ret
);
3540 rdev
= ERR_PTR(ret
);
3543 EXPORT_SYMBOL_GPL(regulator_register
);
3546 * regulator_unregister - unregister regulator
3547 * @rdev: regulator to unregister
3549 * Called by regulator drivers to unregister a regulator.
3551 void regulator_unregister(struct regulator_dev
*rdev
)
3557 while (rdev
->use_count
--)
3558 regulator_disable(rdev
->supply
);
3559 regulator_put(rdev
->supply
);
3561 mutex_lock(®ulator_list_mutex
);
3562 debugfs_remove_recursive(rdev
->debugfs
);
3563 flush_work(&rdev
->disable_work
.work
);
3564 WARN_ON(rdev
->open_count
);
3565 unset_regulator_supplies(rdev
);
3566 list_del(&rdev
->list
);
3567 kfree(rdev
->constraints
);
3568 regulator_ena_gpio_free(rdev
);
3569 device_unregister(&rdev
->dev
);
3570 mutex_unlock(®ulator_list_mutex
);
3572 EXPORT_SYMBOL_GPL(regulator_unregister
);
3575 * regulator_suspend_prepare - prepare regulators for system wide suspend
3576 * @state: system suspend state
3578 * Configure each regulator with it's suspend operating parameters for state.
3579 * This will usually be called by machine suspend code prior to supending.
3581 int regulator_suspend_prepare(suspend_state_t state
)
3583 struct regulator_dev
*rdev
;
3586 /* ON is handled by regulator active state */
3587 if (state
== PM_SUSPEND_ON
)
3590 mutex_lock(®ulator_list_mutex
);
3591 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3593 mutex_lock(&rdev
->mutex
);
3594 ret
= suspend_prepare(rdev
, state
);
3595 mutex_unlock(&rdev
->mutex
);
3598 rdev_err(rdev
, "failed to prepare\n");
3603 mutex_unlock(®ulator_list_mutex
);
3606 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3609 * regulator_suspend_finish - resume regulators from system wide suspend
3611 * Turn on regulators that might be turned off by regulator_suspend_prepare
3612 * and that should be turned on according to the regulators properties.
3614 int regulator_suspend_finish(void)
3616 struct regulator_dev
*rdev
;
3619 mutex_lock(®ulator_list_mutex
);
3620 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3621 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3623 mutex_lock(&rdev
->mutex
);
3624 if ((rdev
->use_count
> 0 || rdev
->constraints
->always_on
) &&
3626 error
= ops
->enable(rdev
);
3630 if (!has_full_constraints
)
3634 if (!_regulator_is_enabled(rdev
))
3637 error
= ops
->disable(rdev
);
3642 mutex_unlock(&rdev
->mutex
);
3644 mutex_unlock(®ulator_list_mutex
);
3647 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3650 * regulator_has_full_constraints - the system has fully specified constraints
3652 * Calling this function will cause the regulator API to disable all
3653 * regulators which have a zero use count and don't have an always_on
3654 * constraint in a late_initcall.
3656 * The intention is that this will become the default behaviour in a
3657 * future kernel release so users are encouraged to use this facility
3660 void regulator_has_full_constraints(void)
3662 has_full_constraints
= 1;
3664 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3667 * rdev_get_drvdata - get rdev regulator driver data
3670 * Get rdev regulator driver private data. This call can be used in the
3671 * regulator driver context.
3673 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3675 return rdev
->reg_data
;
3677 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3680 * regulator_get_drvdata - get regulator driver data
3681 * @regulator: regulator
3683 * Get regulator driver private data. This call can be used in the consumer
3684 * driver context when non API regulator specific functions need to be called.
3686 void *regulator_get_drvdata(struct regulator
*regulator
)
3688 return regulator
->rdev
->reg_data
;
3690 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3693 * regulator_set_drvdata - set regulator driver data
3694 * @regulator: regulator
3697 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3699 regulator
->rdev
->reg_data
= data
;
3701 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3704 * regulator_get_id - get regulator ID
3707 int rdev_get_id(struct regulator_dev
*rdev
)
3709 return rdev
->desc
->id
;
3711 EXPORT_SYMBOL_GPL(rdev_get_id
);
3713 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3717 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3719 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3721 return reg_init_data
->driver_data
;
3723 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3725 #ifdef CONFIG_DEBUG_FS
3726 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3727 size_t count
, loff_t
*ppos
)
3729 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3730 ssize_t len
, ret
= 0;
3731 struct regulator_map
*map
;
3736 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3737 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3739 rdev_get_name(map
->regulator
), map
->dev_name
,
3743 if (ret
> PAGE_SIZE
) {
3749 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3757 static const struct file_operations supply_map_fops
= {
3758 #ifdef CONFIG_DEBUG_FS
3759 .read
= supply_map_read_file
,
3760 .llseek
= default_llseek
,
3764 static int __init
regulator_init(void)
3768 ret
= class_register(®ulator_class
);
3770 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3772 pr_warn("regulator: Failed to create debugfs directory\n");
3774 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3777 regulator_dummy_init();
3782 /* init early to allow our consumers to complete system booting */
3783 core_initcall(regulator_init
);
3785 static int __init
regulator_init_complete(void)
3787 struct regulator_dev
*rdev
;
3788 struct regulator_ops
*ops
;
3789 struct regulation_constraints
*c
;
3793 * Since DT doesn't provide an idiomatic mechanism for
3794 * enabling full constraints and since it's much more natural
3795 * with DT to provide them just assume that a DT enabled
3796 * system has full constraints.
3798 if (of_have_populated_dt())
3799 has_full_constraints
= true;
3801 mutex_lock(®ulator_list_mutex
);
3803 /* If we have a full configuration then disable any regulators
3804 * which are not in use or always_on. This will become the
3805 * default behaviour in the future.
3807 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3808 ops
= rdev
->desc
->ops
;
3809 c
= rdev
->constraints
;
3811 if (!ops
->disable
|| (c
&& c
->always_on
))
3814 mutex_lock(&rdev
->mutex
);
3816 if (rdev
->use_count
)
3819 /* If we can't read the status assume it's on. */
3820 if (ops
->is_enabled
)
3821 enabled
= ops
->is_enabled(rdev
);
3828 if (has_full_constraints
) {
3829 /* We log since this may kill the system if it
3831 rdev_info(rdev
, "disabling\n");
3832 ret
= ops
->disable(rdev
);
3834 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
3837 /* The intention is that in future we will
3838 * assume that full constraints are provided
3839 * so warn even if we aren't going to do
3842 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
3846 mutex_unlock(&rdev
->mutex
);
3849 mutex_unlock(®ulator_list_mutex
);
3853 late_initcall(regulator_init_complete
);