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>
40 #define rdev_crit(rdev, fmt, ...) \
41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
42 #define rdev_err(rdev, fmt, ...) \
43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_warn(rdev, fmt, ...) \
45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_info(rdev, fmt, ...) \
47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_dbg(rdev, fmt, ...) \
49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
51 static DEFINE_MUTEX(regulator_list_mutex
);
52 static LIST_HEAD(regulator_list
);
53 static LIST_HEAD(regulator_map_list
);
54 static bool has_full_constraints
;
55 static bool board_wants_dummy_regulator
;
57 static struct dentry
*debugfs_root
;
60 * struct regulator_map
62 * Used to provide symbolic supply names to devices.
64 struct regulator_map
{
65 struct list_head list
;
66 const char *dev_name
; /* The dev_name() for the consumer */
68 struct regulator_dev
*regulator
;
74 * One for each consumer device.
78 struct list_head list
;
79 unsigned int always_on
:1;
80 unsigned int bypass
:1;
85 struct device_attribute dev_attr
;
86 struct regulator_dev
*rdev
;
87 struct dentry
*debugfs
;
90 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
91 static int _regulator_disable(struct regulator_dev
*rdev
);
92 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
93 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
94 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
95 static void _notifier_call_chain(struct regulator_dev
*rdev
,
96 unsigned long event
, void *data
);
97 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
98 int min_uV
, int max_uV
);
99 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
101 const char *supply_name
);
103 static const char *rdev_get_name(struct regulator_dev
*rdev
)
105 if (rdev
->constraints
&& rdev
->constraints
->name
)
106 return rdev
->constraints
->name
;
107 else if (rdev
->desc
->name
)
108 return rdev
->desc
->name
;
114 * of_get_regulator - get a regulator device node based on supply name
115 * @dev: Device pointer for the consumer (of regulator) device
116 * @supply: regulator supply name
118 * Extract the regulator device node corresponding to the supply name.
119 * retruns the device node corresponding to the regulator if found, else
122 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
124 struct device_node
*regnode
= NULL
;
125 char prop_name
[32]; /* 32 is max size of property name */
127 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
129 snprintf(prop_name
, 32, "%s-supply", supply
);
130 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
133 dev_dbg(dev
, "Looking up %s property in node %s failed",
134 prop_name
, dev
->of_node
->full_name
);
140 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
142 if (!rdev
->constraints
)
145 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
151 /* Platform voltage constraint check */
152 static int regulator_check_voltage(struct regulator_dev
*rdev
,
153 int *min_uV
, int *max_uV
)
155 BUG_ON(*min_uV
> *max_uV
);
157 if (!rdev
->constraints
) {
158 rdev_err(rdev
, "no constraints\n");
161 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
162 rdev_err(rdev
, "operation not allowed\n");
166 if (*max_uV
> rdev
->constraints
->max_uV
)
167 *max_uV
= rdev
->constraints
->max_uV
;
168 if (*min_uV
< rdev
->constraints
->min_uV
)
169 *min_uV
= rdev
->constraints
->min_uV
;
171 if (*min_uV
> *max_uV
) {
172 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
180 /* Make sure we select a voltage that suits the needs of all
181 * regulator consumers
183 static int regulator_check_consumers(struct regulator_dev
*rdev
,
184 int *min_uV
, int *max_uV
)
186 struct regulator
*regulator
;
188 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
190 * Assume consumers that didn't say anything are OK
191 * with anything in the constraint range.
193 if (!regulator
->min_uV
&& !regulator
->max_uV
)
196 if (*max_uV
> regulator
->max_uV
)
197 *max_uV
= regulator
->max_uV
;
198 if (*min_uV
< regulator
->min_uV
)
199 *min_uV
= regulator
->min_uV
;
202 if (*min_uV
> *max_uV
) {
203 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
211 /* current constraint check */
212 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
213 int *min_uA
, int *max_uA
)
215 BUG_ON(*min_uA
> *max_uA
);
217 if (!rdev
->constraints
) {
218 rdev_err(rdev
, "no constraints\n");
221 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
222 rdev_err(rdev
, "operation not allowed\n");
226 if (*max_uA
> rdev
->constraints
->max_uA
)
227 *max_uA
= rdev
->constraints
->max_uA
;
228 if (*min_uA
< rdev
->constraints
->min_uA
)
229 *min_uA
= rdev
->constraints
->min_uA
;
231 if (*min_uA
> *max_uA
) {
232 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
240 /* operating mode constraint check */
241 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
244 case REGULATOR_MODE_FAST
:
245 case REGULATOR_MODE_NORMAL
:
246 case REGULATOR_MODE_IDLE
:
247 case REGULATOR_MODE_STANDBY
:
250 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
254 if (!rdev
->constraints
) {
255 rdev_err(rdev
, "no constraints\n");
258 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
259 rdev_err(rdev
, "operation not allowed\n");
263 /* The modes are bitmasks, the most power hungry modes having
264 * the lowest values. If the requested mode isn't supported
265 * try higher modes. */
267 if (rdev
->constraints
->valid_modes_mask
& *mode
)
275 /* dynamic regulator mode switching constraint check */
276 static int regulator_check_drms(struct regulator_dev
*rdev
)
278 if (!rdev
->constraints
) {
279 rdev_err(rdev
, "no constraints\n");
282 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
283 rdev_err(rdev
, "operation not allowed\n");
289 static ssize_t
regulator_uV_show(struct device
*dev
,
290 struct device_attribute
*attr
, char *buf
)
292 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
295 mutex_lock(&rdev
->mutex
);
296 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
297 mutex_unlock(&rdev
->mutex
);
301 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
303 static ssize_t
regulator_uA_show(struct device
*dev
,
304 struct device_attribute
*attr
, char *buf
)
306 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
308 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
310 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
312 static ssize_t
regulator_name_show(struct device
*dev
,
313 struct device_attribute
*attr
, char *buf
)
315 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
317 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
320 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
323 case REGULATOR_MODE_FAST
:
324 return sprintf(buf
, "fast\n");
325 case REGULATOR_MODE_NORMAL
:
326 return sprintf(buf
, "normal\n");
327 case REGULATOR_MODE_IDLE
:
328 return sprintf(buf
, "idle\n");
329 case REGULATOR_MODE_STANDBY
:
330 return sprintf(buf
, "standby\n");
332 return sprintf(buf
, "unknown\n");
335 static ssize_t
regulator_opmode_show(struct device
*dev
,
336 struct device_attribute
*attr
, char *buf
)
338 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
340 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
342 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
344 static ssize_t
regulator_print_state(char *buf
, int state
)
347 return sprintf(buf
, "enabled\n");
349 return sprintf(buf
, "disabled\n");
351 return sprintf(buf
, "unknown\n");
354 static ssize_t
regulator_state_show(struct device
*dev
,
355 struct device_attribute
*attr
, char *buf
)
357 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
360 mutex_lock(&rdev
->mutex
);
361 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
362 mutex_unlock(&rdev
->mutex
);
366 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
368 static ssize_t
regulator_status_show(struct device
*dev
,
369 struct device_attribute
*attr
, char *buf
)
371 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
375 status
= rdev
->desc
->ops
->get_status(rdev
);
380 case REGULATOR_STATUS_OFF
:
383 case REGULATOR_STATUS_ON
:
386 case REGULATOR_STATUS_ERROR
:
389 case REGULATOR_STATUS_FAST
:
392 case REGULATOR_STATUS_NORMAL
:
395 case REGULATOR_STATUS_IDLE
:
398 case REGULATOR_STATUS_STANDBY
:
401 case REGULATOR_STATUS_BYPASS
:
404 case REGULATOR_STATUS_UNDEFINED
:
411 return sprintf(buf
, "%s\n", label
);
413 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
415 static ssize_t
regulator_min_uA_show(struct device
*dev
,
416 struct device_attribute
*attr
, char *buf
)
418 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
420 if (!rdev
->constraints
)
421 return sprintf(buf
, "constraint not defined\n");
423 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
425 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
427 static ssize_t
regulator_max_uA_show(struct device
*dev
,
428 struct device_attribute
*attr
, char *buf
)
430 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
432 if (!rdev
->constraints
)
433 return sprintf(buf
, "constraint not defined\n");
435 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
437 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
439 static ssize_t
regulator_min_uV_show(struct device
*dev
,
440 struct device_attribute
*attr
, char *buf
)
442 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
444 if (!rdev
->constraints
)
445 return sprintf(buf
, "constraint not defined\n");
447 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
449 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
451 static ssize_t
regulator_max_uV_show(struct device
*dev
,
452 struct device_attribute
*attr
, char *buf
)
454 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
456 if (!rdev
->constraints
)
457 return sprintf(buf
, "constraint not defined\n");
459 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
461 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
463 static ssize_t
regulator_total_uA_show(struct device
*dev
,
464 struct device_attribute
*attr
, char *buf
)
466 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
467 struct regulator
*regulator
;
470 mutex_lock(&rdev
->mutex
);
471 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
472 uA
+= regulator
->uA_load
;
473 mutex_unlock(&rdev
->mutex
);
474 return sprintf(buf
, "%d\n", uA
);
476 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
478 static ssize_t
regulator_num_users_show(struct device
*dev
,
479 struct device_attribute
*attr
, char *buf
)
481 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
482 return sprintf(buf
, "%d\n", rdev
->use_count
);
485 static ssize_t
regulator_type_show(struct device
*dev
,
486 struct device_attribute
*attr
, char *buf
)
488 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
490 switch (rdev
->desc
->type
) {
491 case REGULATOR_VOLTAGE
:
492 return sprintf(buf
, "voltage\n");
493 case REGULATOR_CURRENT
:
494 return sprintf(buf
, "current\n");
496 return sprintf(buf
, "unknown\n");
499 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
500 struct device_attribute
*attr
, char *buf
)
502 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
504 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
506 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
507 regulator_suspend_mem_uV_show
, NULL
);
509 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
510 struct device_attribute
*attr
, char *buf
)
512 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
514 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
516 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
517 regulator_suspend_disk_uV_show
, NULL
);
519 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
520 struct device_attribute
*attr
, char *buf
)
522 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
524 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
526 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
527 regulator_suspend_standby_uV_show
, NULL
);
529 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
530 struct device_attribute
*attr
, char *buf
)
532 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
534 return regulator_print_opmode(buf
,
535 rdev
->constraints
->state_mem
.mode
);
537 static DEVICE_ATTR(suspend_mem_mode
, 0444,
538 regulator_suspend_mem_mode_show
, NULL
);
540 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
541 struct device_attribute
*attr
, char *buf
)
543 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
545 return regulator_print_opmode(buf
,
546 rdev
->constraints
->state_disk
.mode
);
548 static DEVICE_ATTR(suspend_disk_mode
, 0444,
549 regulator_suspend_disk_mode_show
, NULL
);
551 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
552 struct device_attribute
*attr
, char *buf
)
554 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
556 return regulator_print_opmode(buf
,
557 rdev
->constraints
->state_standby
.mode
);
559 static DEVICE_ATTR(suspend_standby_mode
, 0444,
560 regulator_suspend_standby_mode_show
, NULL
);
562 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
563 struct device_attribute
*attr
, char *buf
)
565 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
567 return regulator_print_state(buf
,
568 rdev
->constraints
->state_mem
.enabled
);
570 static DEVICE_ATTR(suspend_mem_state
, 0444,
571 regulator_suspend_mem_state_show
, NULL
);
573 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
574 struct device_attribute
*attr
, char *buf
)
576 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
578 return regulator_print_state(buf
,
579 rdev
->constraints
->state_disk
.enabled
);
581 static DEVICE_ATTR(suspend_disk_state
, 0444,
582 regulator_suspend_disk_state_show
, NULL
);
584 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
585 struct device_attribute
*attr
, char *buf
)
587 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
589 return regulator_print_state(buf
,
590 rdev
->constraints
->state_standby
.enabled
);
592 static DEVICE_ATTR(suspend_standby_state
, 0444,
593 regulator_suspend_standby_state_show
, NULL
);
595 static ssize_t
regulator_bypass_show(struct device
*dev
,
596 struct device_attribute
*attr
, char *buf
)
598 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
603 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
612 return sprintf(buf
, "%s\n", report
);
614 static DEVICE_ATTR(bypass
, 0444,
615 regulator_bypass_show
, NULL
);
618 * These are the only attributes are present for all regulators.
619 * Other attributes are a function of regulator functionality.
621 static struct device_attribute regulator_dev_attrs
[] = {
622 __ATTR(name
, 0444, regulator_name_show
, NULL
),
623 __ATTR(num_users
, 0444, regulator_num_users_show
, NULL
),
624 __ATTR(type
, 0444, regulator_type_show
, NULL
),
628 static void regulator_dev_release(struct device
*dev
)
630 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
634 static struct class regulator_class
= {
636 .dev_release
= regulator_dev_release
,
637 .dev_attrs
= regulator_dev_attrs
,
640 /* Calculate the new optimum regulator operating mode based on the new total
641 * consumer load. All locks held by caller */
642 static void drms_uA_update(struct regulator_dev
*rdev
)
644 struct regulator
*sibling
;
645 int current_uA
= 0, output_uV
, input_uV
, err
;
648 err
= regulator_check_drms(rdev
);
649 if (err
< 0 || !rdev
->desc
->ops
->get_optimum_mode
||
650 (!rdev
->desc
->ops
->get_voltage
&&
651 !rdev
->desc
->ops
->get_voltage_sel
) ||
652 !rdev
->desc
->ops
->set_mode
)
655 /* get output voltage */
656 output_uV
= _regulator_get_voltage(rdev
);
660 /* get input voltage */
663 input_uV
= regulator_get_voltage(rdev
->supply
);
665 input_uV
= rdev
->constraints
->input_uV
;
669 /* calc total requested load */
670 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
671 current_uA
+= sibling
->uA_load
;
673 /* now get the optimum mode for our new total regulator load */
674 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
675 output_uV
, current_uA
);
677 /* check the new mode is allowed */
678 err
= regulator_mode_constrain(rdev
, &mode
);
680 rdev
->desc
->ops
->set_mode(rdev
, mode
);
683 static int suspend_set_state(struct regulator_dev
*rdev
,
684 struct regulator_state
*rstate
)
688 /* If we have no suspend mode configration don't set anything;
689 * only warn if the driver implements set_suspend_voltage or
690 * set_suspend_mode callback.
692 if (!rstate
->enabled
&& !rstate
->disabled
) {
693 if (rdev
->desc
->ops
->set_suspend_voltage
||
694 rdev
->desc
->ops
->set_suspend_mode
)
695 rdev_warn(rdev
, "No configuration\n");
699 if (rstate
->enabled
&& rstate
->disabled
) {
700 rdev_err(rdev
, "invalid configuration\n");
704 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
705 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
706 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
707 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
708 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
712 rdev_err(rdev
, "failed to enabled/disable\n");
716 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
717 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
719 rdev_err(rdev
, "failed to set voltage\n");
724 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
725 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
727 rdev_err(rdev
, "failed to set mode\n");
734 /* locks held by caller */
735 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
737 if (!rdev
->constraints
)
741 case PM_SUSPEND_STANDBY
:
742 return suspend_set_state(rdev
,
743 &rdev
->constraints
->state_standby
);
745 return suspend_set_state(rdev
,
746 &rdev
->constraints
->state_mem
);
748 return suspend_set_state(rdev
,
749 &rdev
->constraints
->state_disk
);
755 static void print_constraints(struct regulator_dev
*rdev
)
757 struct regulation_constraints
*constraints
= rdev
->constraints
;
762 if (constraints
->min_uV
&& constraints
->max_uV
) {
763 if (constraints
->min_uV
== constraints
->max_uV
)
764 count
+= sprintf(buf
+ count
, "%d mV ",
765 constraints
->min_uV
/ 1000);
767 count
+= sprintf(buf
+ count
, "%d <--> %d mV ",
768 constraints
->min_uV
/ 1000,
769 constraints
->max_uV
/ 1000);
772 if (!constraints
->min_uV
||
773 constraints
->min_uV
!= constraints
->max_uV
) {
774 ret
= _regulator_get_voltage(rdev
);
776 count
+= sprintf(buf
+ count
, "at %d mV ", ret
/ 1000);
779 if (constraints
->uV_offset
)
780 count
+= sprintf(buf
, "%dmV offset ",
781 constraints
->uV_offset
/ 1000);
783 if (constraints
->min_uA
&& constraints
->max_uA
) {
784 if (constraints
->min_uA
== constraints
->max_uA
)
785 count
+= sprintf(buf
+ count
, "%d mA ",
786 constraints
->min_uA
/ 1000);
788 count
+= sprintf(buf
+ count
, "%d <--> %d mA ",
789 constraints
->min_uA
/ 1000,
790 constraints
->max_uA
/ 1000);
793 if (!constraints
->min_uA
||
794 constraints
->min_uA
!= constraints
->max_uA
) {
795 ret
= _regulator_get_current_limit(rdev
);
797 count
+= sprintf(buf
+ count
, "at %d mA ", ret
/ 1000);
800 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
801 count
+= sprintf(buf
+ count
, "fast ");
802 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
803 count
+= sprintf(buf
+ count
, "normal ");
804 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
805 count
+= sprintf(buf
+ count
, "idle ");
806 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
807 count
+= sprintf(buf
+ count
, "standby");
810 sprintf(buf
, "no parameters");
812 rdev_info(rdev
, "%s\n", buf
);
814 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
815 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
817 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
820 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
821 struct regulation_constraints
*constraints
)
823 struct regulator_ops
*ops
= rdev
->desc
->ops
;
826 /* do we need to apply the constraint voltage */
827 if (rdev
->constraints
->apply_uV
&&
828 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
829 ret
= _regulator_do_set_voltage(rdev
,
830 rdev
->constraints
->min_uV
,
831 rdev
->constraints
->max_uV
);
833 rdev_err(rdev
, "failed to apply %duV constraint\n",
834 rdev
->constraints
->min_uV
);
839 /* constrain machine-level voltage specs to fit
840 * the actual range supported by this regulator.
842 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
843 int count
= rdev
->desc
->n_voltages
;
845 int min_uV
= INT_MAX
;
846 int max_uV
= INT_MIN
;
847 int cmin
= constraints
->min_uV
;
848 int cmax
= constraints
->max_uV
;
850 /* it's safe to autoconfigure fixed-voltage supplies
851 and the constraints are used by list_voltage. */
852 if (count
== 1 && !cmin
) {
855 constraints
->min_uV
= cmin
;
856 constraints
->max_uV
= cmax
;
859 /* voltage constraints are optional */
860 if ((cmin
== 0) && (cmax
== 0))
863 /* else require explicit machine-level constraints */
864 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
865 rdev_err(rdev
, "invalid voltage constraints\n");
869 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
870 for (i
= 0; i
< count
; i
++) {
873 value
= ops
->list_voltage(rdev
, i
);
877 /* maybe adjust [min_uV..max_uV] */
878 if (value
>= cmin
&& value
< min_uV
)
880 if (value
<= cmax
&& value
> max_uV
)
884 /* final: [min_uV..max_uV] valid iff constraints valid */
885 if (max_uV
< min_uV
) {
887 "unsupportable voltage constraints %u-%uuV\n",
892 /* use regulator's subset of machine constraints */
893 if (constraints
->min_uV
< min_uV
) {
894 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
895 constraints
->min_uV
, min_uV
);
896 constraints
->min_uV
= min_uV
;
898 if (constraints
->max_uV
> max_uV
) {
899 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
900 constraints
->max_uV
, max_uV
);
901 constraints
->max_uV
= max_uV
;
909 * set_machine_constraints - sets regulator constraints
910 * @rdev: regulator source
911 * @constraints: constraints to apply
913 * Allows platform initialisation code to define and constrain
914 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
915 * Constraints *must* be set by platform code in order for some
916 * regulator operations to proceed i.e. set_voltage, set_current_limit,
919 static int set_machine_constraints(struct regulator_dev
*rdev
,
920 const struct regulation_constraints
*constraints
)
923 struct regulator_ops
*ops
= rdev
->desc
->ops
;
926 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
929 rdev
->constraints
= kzalloc(sizeof(*constraints
),
931 if (!rdev
->constraints
)
934 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
938 /* do we need to setup our suspend state */
939 if (rdev
->constraints
->initial_state
) {
940 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
942 rdev_err(rdev
, "failed to set suspend state\n");
947 if (rdev
->constraints
->initial_mode
) {
948 if (!ops
->set_mode
) {
949 rdev_err(rdev
, "no set_mode operation\n");
954 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
956 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
961 /* If the constraints say the regulator should be on at this point
962 * and we have control then make sure it is enabled.
964 if ((rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) &&
966 ret
= ops
->enable(rdev
);
968 rdev_err(rdev
, "failed to enable\n");
973 if (rdev
->constraints
->ramp_delay
&& ops
->set_ramp_delay
) {
974 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
976 rdev_err(rdev
, "failed to set ramp_delay\n");
981 print_constraints(rdev
);
984 kfree(rdev
->constraints
);
985 rdev
->constraints
= NULL
;
990 * set_supply - set regulator supply regulator
991 * @rdev: regulator name
992 * @supply_rdev: supply regulator name
994 * Called by platform initialisation code to set the supply regulator for this
995 * regulator. This ensures that a regulators supply will also be enabled by the
996 * core if it's child is enabled.
998 static int set_supply(struct regulator_dev
*rdev
,
999 struct regulator_dev
*supply_rdev
)
1003 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1005 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1006 if (rdev
->supply
== NULL
) {
1010 supply_rdev
->open_count
++;
1016 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1017 * @rdev: regulator source
1018 * @consumer_dev_name: dev_name() string for device supply applies to
1019 * @supply: symbolic name for supply
1021 * Allows platform initialisation code to map physical regulator
1022 * sources to symbolic names for supplies for use by devices. Devices
1023 * should use these symbolic names to request regulators, avoiding the
1024 * need to provide board-specific regulator names as platform data.
1026 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1027 const char *consumer_dev_name
,
1030 struct regulator_map
*node
;
1036 if (consumer_dev_name
!= NULL
)
1041 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1042 if (node
->dev_name
&& consumer_dev_name
) {
1043 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1045 } else if (node
->dev_name
|| consumer_dev_name
) {
1049 if (strcmp(node
->supply
, supply
) != 0)
1052 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1054 dev_name(&node
->regulator
->dev
),
1055 node
->regulator
->desc
->name
,
1057 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1061 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1065 node
->regulator
= rdev
;
1066 node
->supply
= supply
;
1069 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1070 if (node
->dev_name
== NULL
) {
1076 list_add(&node
->list
, ®ulator_map_list
);
1080 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1082 struct regulator_map
*node
, *n
;
1084 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1085 if (rdev
== node
->regulator
) {
1086 list_del(&node
->list
);
1087 kfree(node
->dev_name
);
1093 #define REG_STR_SIZE 64
1095 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1097 const char *supply_name
)
1099 struct regulator
*regulator
;
1100 char buf
[REG_STR_SIZE
];
1103 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1104 if (regulator
== NULL
)
1107 mutex_lock(&rdev
->mutex
);
1108 regulator
->rdev
= rdev
;
1109 list_add(®ulator
->list
, &rdev
->consumer_list
);
1112 regulator
->dev
= dev
;
1114 /* Add a link to the device sysfs entry */
1115 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1116 dev
->kobj
.name
, supply_name
);
1117 if (size
>= REG_STR_SIZE
)
1120 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1121 if (regulator
->supply_name
== NULL
)
1124 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1127 rdev_warn(rdev
, "could not add device link %s err %d\n",
1128 dev
->kobj
.name
, err
);
1132 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1133 if (regulator
->supply_name
== NULL
)
1137 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1139 if (!regulator
->debugfs
) {
1140 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1142 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1143 ®ulator
->uA_load
);
1144 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1145 ®ulator
->min_uV
);
1146 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1147 ®ulator
->max_uV
);
1151 * Check now if the regulator is an always on regulator - if
1152 * it is then we don't need to do nearly so much work for
1153 * enable/disable calls.
1155 if (!_regulator_can_change_status(rdev
) &&
1156 _regulator_is_enabled(rdev
))
1157 regulator
->always_on
= true;
1159 mutex_unlock(&rdev
->mutex
);
1162 list_del(®ulator
->list
);
1164 mutex_unlock(&rdev
->mutex
);
1168 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1170 if (!rdev
->desc
->ops
->enable_time
)
1171 return rdev
->desc
->enable_time
;
1172 return rdev
->desc
->ops
->enable_time(rdev
);
1175 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1179 struct regulator_dev
*r
;
1180 struct device_node
*node
;
1181 struct regulator_map
*map
;
1182 const char *devname
= NULL
;
1184 /* first do a dt based lookup */
1185 if (dev
&& dev
->of_node
) {
1186 node
= of_get_regulator(dev
, supply
);
1188 list_for_each_entry(r
, ®ulator_list
, list
)
1189 if (r
->dev
.parent
&&
1190 node
== r
->dev
.of_node
)
1194 * If we couldn't even get the node then it's
1195 * not just that the device didn't register
1196 * yet, there's no node and we'll never
1203 /* if not found, try doing it non-dt way */
1205 devname
= dev_name(dev
);
1207 list_for_each_entry(r
, ®ulator_list
, list
)
1208 if (strcmp(rdev_get_name(r
), supply
) == 0)
1211 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1212 /* If the mapping has a device set up it must match */
1213 if (map
->dev_name
&&
1214 (!devname
|| strcmp(map
->dev_name
, devname
)))
1217 if (strcmp(map
->supply
, supply
) == 0)
1218 return map
->regulator
;
1225 /* Internal regulator request function */
1226 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1229 struct regulator_dev
*rdev
;
1230 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1231 const char *devname
= NULL
;
1235 pr_err("get() with no identifier\n");
1240 devname
= dev_name(dev
);
1242 mutex_lock(®ulator_list_mutex
);
1244 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1248 if (board_wants_dummy_regulator
) {
1249 rdev
= dummy_regulator_rdev
;
1253 #ifdef CONFIG_REGULATOR_DUMMY
1255 devname
= "deviceless";
1257 /* If the board didn't flag that it was fully constrained then
1258 * substitute in a dummy regulator so consumers can continue.
1260 if (!has_full_constraints
) {
1261 pr_warn("%s supply %s not found, using dummy regulator\n",
1263 rdev
= dummy_regulator_rdev
;
1268 mutex_unlock(®ulator_list_mutex
);
1272 if (rdev
->exclusive
) {
1273 regulator
= ERR_PTR(-EPERM
);
1277 if (exclusive
&& rdev
->open_count
) {
1278 regulator
= ERR_PTR(-EBUSY
);
1282 if (!try_module_get(rdev
->owner
))
1285 regulator
= create_regulator(rdev
, dev
, id
);
1286 if (regulator
== NULL
) {
1287 regulator
= ERR_PTR(-ENOMEM
);
1288 module_put(rdev
->owner
);
1294 rdev
->exclusive
= 1;
1296 ret
= _regulator_is_enabled(rdev
);
1298 rdev
->use_count
= 1;
1300 rdev
->use_count
= 0;
1304 mutex_unlock(®ulator_list_mutex
);
1310 * regulator_get - lookup and obtain a reference to a regulator.
1311 * @dev: device for regulator "consumer"
1312 * @id: Supply name or regulator ID.
1314 * Returns a struct regulator corresponding to the regulator producer,
1315 * or IS_ERR() condition containing errno.
1317 * Use of supply names configured via regulator_set_device_supply() is
1318 * strongly encouraged. It is recommended that the supply name used
1319 * should match the name used for the supply and/or the relevant
1320 * device pins in the datasheet.
1322 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1324 return _regulator_get(dev
, id
, 0);
1326 EXPORT_SYMBOL_GPL(regulator_get
);
1328 static void devm_regulator_release(struct device
*dev
, void *res
)
1330 regulator_put(*(struct regulator
**)res
);
1334 * devm_regulator_get - Resource managed regulator_get()
1335 * @dev: device for regulator "consumer"
1336 * @id: Supply name or regulator ID.
1338 * Managed regulator_get(). Regulators returned from this function are
1339 * automatically regulator_put() on driver detach. See regulator_get() for more
1342 struct regulator
*devm_regulator_get(struct device
*dev
, const char *id
)
1344 struct regulator
**ptr
, *regulator
;
1346 ptr
= devres_alloc(devm_regulator_release
, sizeof(*ptr
), GFP_KERNEL
);
1348 return ERR_PTR(-ENOMEM
);
1350 regulator
= regulator_get(dev
, id
);
1351 if (!IS_ERR(regulator
)) {
1353 devres_add(dev
, ptr
);
1360 EXPORT_SYMBOL_GPL(devm_regulator_get
);
1363 * regulator_get_exclusive - obtain exclusive access to a regulator.
1364 * @dev: device for regulator "consumer"
1365 * @id: Supply name or regulator ID.
1367 * Returns a struct regulator corresponding to the regulator producer,
1368 * or IS_ERR() condition containing errno. Other consumers will be
1369 * unable to obtain this reference is held and the use count for the
1370 * regulator will be initialised to reflect the current state of the
1373 * This is intended for use by consumers which cannot tolerate shared
1374 * use of the regulator such as those which need to force the
1375 * regulator off for correct operation of the hardware they are
1378 * Use of supply names configured via regulator_set_device_supply() is
1379 * strongly encouraged. It is recommended that the supply name used
1380 * should match the name used for the supply and/or the relevant
1381 * device pins in the datasheet.
1383 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1385 return _regulator_get(dev
, id
, 1);
1387 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1389 /* Locks held by regulator_put() */
1390 static void _regulator_put(struct regulator
*regulator
)
1392 struct regulator_dev
*rdev
;
1394 if (regulator
== NULL
|| IS_ERR(regulator
))
1397 rdev
= regulator
->rdev
;
1399 debugfs_remove_recursive(regulator
->debugfs
);
1401 /* remove any sysfs entries */
1403 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1404 kfree(regulator
->supply_name
);
1405 list_del(®ulator
->list
);
1409 rdev
->exclusive
= 0;
1411 module_put(rdev
->owner
);
1415 * regulator_put - "free" the regulator source
1416 * @regulator: regulator source
1418 * Note: drivers must ensure that all regulator_enable calls made on this
1419 * regulator source are balanced by regulator_disable calls prior to calling
1422 void regulator_put(struct regulator
*regulator
)
1424 mutex_lock(®ulator_list_mutex
);
1425 _regulator_put(regulator
);
1426 mutex_unlock(®ulator_list_mutex
);
1428 EXPORT_SYMBOL_GPL(regulator_put
);
1430 static int devm_regulator_match(struct device
*dev
, void *res
, void *data
)
1432 struct regulator
**r
= res
;
1441 * devm_regulator_put - Resource managed regulator_put()
1442 * @regulator: regulator to free
1444 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1445 * this function will not need to be called and the resource management
1446 * code will ensure that the resource is freed.
1448 void devm_regulator_put(struct regulator
*regulator
)
1452 rc
= devres_release(regulator
->dev
, devm_regulator_release
,
1453 devm_regulator_match
, regulator
);
1457 EXPORT_SYMBOL_GPL(devm_regulator_put
);
1459 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1463 /* Query before enabling in case configuration dependent. */
1464 ret
= _regulator_get_enable_time(rdev
);
1468 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1472 trace_regulator_enable(rdev_get_name(rdev
));
1474 if (rdev
->ena_gpio
) {
1475 gpio_set_value_cansleep(rdev
->ena_gpio
,
1476 !rdev
->ena_gpio_invert
);
1477 rdev
->ena_gpio_state
= 1;
1478 } else if (rdev
->desc
->ops
->enable
) {
1479 ret
= rdev
->desc
->ops
->enable(rdev
);
1486 /* Allow the regulator to ramp; it would be useful to extend
1487 * this for bulk operations so that the regulators can ramp
1489 trace_regulator_enable_delay(rdev_get_name(rdev
));
1491 if (delay
>= 1000) {
1492 mdelay(delay
/ 1000);
1493 udelay(delay
% 1000);
1498 trace_regulator_enable_complete(rdev_get_name(rdev
));
1503 /* locks held by regulator_enable() */
1504 static int _regulator_enable(struct regulator_dev
*rdev
)
1508 /* check voltage and requested load before enabling */
1509 if (rdev
->constraints
&&
1510 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1511 drms_uA_update(rdev
);
1513 if (rdev
->use_count
== 0) {
1514 /* The regulator may on if it's not switchable or left on */
1515 ret
= _regulator_is_enabled(rdev
);
1516 if (ret
== -EINVAL
|| ret
== 0) {
1517 if (!_regulator_can_change_status(rdev
))
1520 ret
= _regulator_do_enable(rdev
);
1524 } else if (ret
< 0) {
1525 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1528 /* Fallthrough on positive return values - already enabled */
1537 * regulator_enable - enable regulator output
1538 * @regulator: regulator source
1540 * Request that the regulator be enabled with the regulator output at
1541 * the predefined voltage or current value. Calls to regulator_enable()
1542 * must be balanced with calls to regulator_disable().
1544 * NOTE: the output value can be set by other drivers, boot loader or may be
1545 * hardwired in the regulator.
1547 int regulator_enable(struct regulator
*regulator
)
1549 struct regulator_dev
*rdev
= regulator
->rdev
;
1552 if (regulator
->always_on
)
1556 ret
= regulator_enable(rdev
->supply
);
1561 mutex_lock(&rdev
->mutex
);
1562 ret
= _regulator_enable(rdev
);
1563 mutex_unlock(&rdev
->mutex
);
1565 if (ret
!= 0 && rdev
->supply
)
1566 regulator_disable(rdev
->supply
);
1570 EXPORT_SYMBOL_GPL(regulator_enable
);
1572 static int _regulator_do_disable(struct regulator_dev
*rdev
)
1576 trace_regulator_disable(rdev_get_name(rdev
));
1578 if (rdev
->ena_gpio
) {
1579 gpio_set_value_cansleep(rdev
->ena_gpio
,
1580 rdev
->ena_gpio_invert
);
1581 rdev
->ena_gpio_state
= 0;
1583 } else if (rdev
->desc
->ops
->disable
) {
1584 ret
= rdev
->desc
->ops
->disable(rdev
);
1589 trace_regulator_disable_complete(rdev_get_name(rdev
));
1591 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1596 /* locks held by regulator_disable() */
1597 static int _regulator_disable(struct regulator_dev
*rdev
)
1601 if (WARN(rdev
->use_count
<= 0,
1602 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1605 /* are we the last user and permitted to disable ? */
1606 if (rdev
->use_count
== 1 &&
1607 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1609 /* we are last user */
1610 if (_regulator_can_change_status(rdev
)) {
1611 ret
= _regulator_do_disable(rdev
);
1613 rdev_err(rdev
, "failed to disable\n");
1618 rdev
->use_count
= 0;
1619 } else if (rdev
->use_count
> 1) {
1621 if (rdev
->constraints
&&
1622 (rdev
->constraints
->valid_ops_mask
&
1623 REGULATOR_CHANGE_DRMS
))
1624 drms_uA_update(rdev
);
1633 * regulator_disable - disable regulator output
1634 * @regulator: regulator source
1636 * Disable the regulator output voltage or current. Calls to
1637 * regulator_enable() must be balanced with calls to
1638 * regulator_disable().
1640 * NOTE: this will only disable the regulator output if no other consumer
1641 * devices have it enabled, the regulator device supports disabling and
1642 * machine constraints permit this operation.
1644 int regulator_disable(struct regulator
*regulator
)
1646 struct regulator_dev
*rdev
= regulator
->rdev
;
1649 if (regulator
->always_on
)
1652 mutex_lock(&rdev
->mutex
);
1653 ret
= _regulator_disable(rdev
);
1654 mutex_unlock(&rdev
->mutex
);
1656 if (ret
== 0 && rdev
->supply
)
1657 regulator_disable(rdev
->supply
);
1661 EXPORT_SYMBOL_GPL(regulator_disable
);
1663 /* locks held by regulator_force_disable() */
1664 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1669 if (rdev
->desc
->ops
->disable
) {
1670 /* ah well, who wants to live forever... */
1671 ret
= rdev
->desc
->ops
->disable(rdev
);
1673 rdev_err(rdev
, "failed to force disable\n");
1676 /* notify other consumers that power has been forced off */
1677 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1678 REGULATOR_EVENT_DISABLE
, NULL
);
1685 * regulator_force_disable - force disable regulator output
1686 * @regulator: regulator source
1688 * Forcibly disable the regulator output voltage or current.
1689 * NOTE: this *will* disable the regulator output even if other consumer
1690 * devices have it enabled. This should be used for situations when device
1691 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1693 int regulator_force_disable(struct regulator
*regulator
)
1695 struct regulator_dev
*rdev
= regulator
->rdev
;
1698 mutex_lock(&rdev
->mutex
);
1699 regulator
->uA_load
= 0;
1700 ret
= _regulator_force_disable(regulator
->rdev
);
1701 mutex_unlock(&rdev
->mutex
);
1704 while (rdev
->open_count
--)
1705 regulator_disable(rdev
->supply
);
1709 EXPORT_SYMBOL_GPL(regulator_force_disable
);
1711 static void regulator_disable_work(struct work_struct
*work
)
1713 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
1717 mutex_lock(&rdev
->mutex
);
1719 BUG_ON(!rdev
->deferred_disables
);
1721 count
= rdev
->deferred_disables
;
1722 rdev
->deferred_disables
= 0;
1724 for (i
= 0; i
< count
; i
++) {
1725 ret
= _regulator_disable(rdev
);
1727 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
1730 mutex_unlock(&rdev
->mutex
);
1733 for (i
= 0; i
< count
; i
++) {
1734 ret
= regulator_disable(rdev
->supply
);
1737 "Supply disable failed: %d\n", ret
);
1744 * regulator_disable_deferred - disable regulator output with delay
1745 * @regulator: regulator source
1746 * @ms: miliseconds until the regulator is disabled
1748 * Execute regulator_disable() on the regulator after a delay. This
1749 * is intended for use with devices that require some time to quiesce.
1751 * NOTE: this will only disable the regulator output if no other consumer
1752 * devices have it enabled, the regulator device supports disabling and
1753 * machine constraints permit this operation.
1755 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
1757 struct regulator_dev
*rdev
= regulator
->rdev
;
1760 if (regulator
->always_on
)
1764 return regulator_disable(regulator
);
1766 mutex_lock(&rdev
->mutex
);
1767 rdev
->deferred_disables
++;
1768 mutex_unlock(&rdev
->mutex
);
1770 ret
= schedule_delayed_work(&rdev
->disable_work
,
1771 msecs_to_jiffies(ms
));
1777 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
1780 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1782 * @rdev: regulator to operate on
1784 * Regulators that use regmap for their register I/O can set the
1785 * enable_reg and enable_mask fields in their descriptor and then use
1786 * this as their is_enabled operation, saving some code.
1788 int regulator_is_enabled_regmap(struct regulator_dev
*rdev
)
1793 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->enable_reg
, &val
);
1797 return (val
& rdev
->desc
->enable_mask
) != 0;
1799 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap
);
1802 * regulator_enable_regmap - standard enable() for regmap users
1804 * @rdev: regulator to operate on
1806 * Regulators that use regmap for their register I/O can set the
1807 * enable_reg and enable_mask fields in their descriptor and then use
1808 * this as their enable() operation, saving some code.
1810 int regulator_enable_regmap(struct regulator_dev
*rdev
)
1812 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1813 rdev
->desc
->enable_mask
,
1814 rdev
->desc
->enable_mask
);
1816 EXPORT_SYMBOL_GPL(regulator_enable_regmap
);
1819 * regulator_disable_regmap - standard disable() for regmap users
1821 * @rdev: regulator to operate on
1823 * Regulators that use regmap for their register I/O can set the
1824 * enable_reg and enable_mask fields in their descriptor and then use
1825 * this as their disable() operation, saving some code.
1827 int regulator_disable_regmap(struct regulator_dev
*rdev
)
1829 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1830 rdev
->desc
->enable_mask
, 0);
1832 EXPORT_SYMBOL_GPL(regulator_disable_regmap
);
1834 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
1836 /* A GPIO control always takes precedence */
1838 return rdev
->ena_gpio_state
;
1840 /* If we don't know then assume that the regulator is always on */
1841 if (!rdev
->desc
->ops
->is_enabled
)
1844 return rdev
->desc
->ops
->is_enabled(rdev
);
1848 * regulator_is_enabled - is the regulator output enabled
1849 * @regulator: regulator source
1851 * Returns positive if the regulator driver backing the source/client
1852 * has requested that the device be enabled, zero if it hasn't, else a
1853 * negative errno code.
1855 * Note that the device backing this regulator handle can have multiple
1856 * users, so it might be enabled even if regulator_enable() was never
1857 * called for this particular source.
1859 int regulator_is_enabled(struct regulator
*regulator
)
1863 if (regulator
->always_on
)
1866 mutex_lock(®ulator
->rdev
->mutex
);
1867 ret
= _regulator_is_enabled(regulator
->rdev
);
1868 mutex_unlock(®ulator
->rdev
->mutex
);
1872 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
1875 * regulator_can_change_voltage - check if regulator can change voltage
1876 * @regulator: regulator source
1878 * Returns positive if the regulator driver backing the source/client
1879 * can change its voltage, false otherwise. Usefull for detecting fixed
1880 * or dummy regulators and disabling voltage change logic in the client
1883 int regulator_can_change_voltage(struct regulator
*regulator
)
1885 struct regulator_dev
*rdev
= regulator
->rdev
;
1887 if (rdev
->constraints
&&
1888 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
1889 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
1892 if (rdev
->desc
->continuous_voltage_range
&&
1893 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
1894 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
1900 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
1903 * regulator_count_voltages - count regulator_list_voltage() selectors
1904 * @regulator: regulator source
1906 * Returns number of selectors, or negative errno. Selectors are
1907 * numbered starting at zero, and typically correspond to bitfields
1908 * in hardware registers.
1910 int regulator_count_voltages(struct regulator
*regulator
)
1912 struct regulator_dev
*rdev
= regulator
->rdev
;
1914 return rdev
->desc
->n_voltages
? : -EINVAL
;
1916 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
1919 * regulator_list_voltage_linear - List voltages with simple calculation
1921 * @rdev: Regulator device
1922 * @selector: Selector to convert into a voltage
1924 * Regulators with a simple linear mapping between voltages and
1925 * selectors can set min_uV and uV_step in the regulator descriptor
1926 * and then use this function as their list_voltage() operation,
1928 int regulator_list_voltage_linear(struct regulator_dev
*rdev
,
1929 unsigned int selector
)
1931 if (selector
>= rdev
->desc
->n_voltages
)
1933 if (selector
< rdev
->desc
->linear_min_sel
)
1936 selector
-= rdev
->desc
->linear_min_sel
;
1938 return rdev
->desc
->min_uV
+ (rdev
->desc
->uV_step
* selector
);
1940 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear
);
1943 * regulator_list_voltage_table - List voltages with table based mapping
1945 * @rdev: Regulator device
1946 * @selector: Selector to convert into a voltage
1948 * Regulators with table based mapping between voltages and
1949 * selectors can set volt_table in the regulator descriptor
1950 * and then use this function as their list_voltage() operation.
1952 int regulator_list_voltage_table(struct regulator_dev
*rdev
,
1953 unsigned int selector
)
1955 if (!rdev
->desc
->volt_table
) {
1956 BUG_ON(!rdev
->desc
->volt_table
);
1960 if (selector
>= rdev
->desc
->n_voltages
)
1963 return rdev
->desc
->volt_table
[selector
];
1965 EXPORT_SYMBOL_GPL(regulator_list_voltage_table
);
1968 * regulator_list_voltage - enumerate supported voltages
1969 * @regulator: regulator source
1970 * @selector: identify voltage to list
1971 * Context: can sleep
1973 * Returns a voltage that can be passed to @regulator_set_voltage(),
1974 * zero if this selector code can't be used on this system, or a
1977 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
1979 struct regulator_dev
*rdev
= regulator
->rdev
;
1980 struct regulator_ops
*ops
= rdev
->desc
->ops
;
1983 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
1986 mutex_lock(&rdev
->mutex
);
1987 ret
= ops
->list_voltage(rdev
, selector
);
1988 mutex_unlock(&rdev
->mutex
);
1991 if (ret
< rdev
->constraints
->min_uV
)
1993 else if (ret
> rdev
->constraints
->max_uV
)
1999 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2002 * regulator_is_supported_voltage - check if a voltage range can be supported
2004 * @regulator: Regulator to check.
2005 * @min_uV: Minimum required voltage in uV.
2006 * @max_uV: Maximum required voltage in uV.
2008 * Returns a boolean or a negative error code.
2010 int regulator_is_supported_voltage(struct regulator
*regulator
,
2011 int min_uV
, int max_uV
)
2013 struct regulator_dev
*rdev
= regulator
->rdev
;
2014 int i
, voltages
, ret
;
2016 /* If we can't change voltage check the current voltage */
2017 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2018 ret
= regulator_get_voltage(regulator
);
2020 return (min_uV
<= ret
&& ret
<= max_uV
);
2025 /* Any voltage within constrains range is fine? */
2026 if (rdev
->desc
->continuous_voltage_range
)
2027 return min_uV
>= rdev
->constraints
->min_uV
&&
2028 max_uV
<= rdev
->constraints
->max_uV
;
2030 ret
= regulator_count_voltages(regulator
);
2035 for (i
= 0; i
< voltages
; i
++) {
2036 ret
= regulator_list_voltage(regulator
, i
);
2038 if (ret
>= min_uV
&& ret
<= max_uV
)
2044 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2047 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2049 * @rdev: regulator to operate on
2051 * Regulators that use regmap for their register I/O can set the
2052 * vsel_reg and vsel_mask fields in their descriptor and then use this
2053 * as their get_voltage_vsel operation, saving some code.
2055 int regulator_get_voltage_sel_regmap(struct regulator_dev
*rdev
)
2060 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->vsel_reg
, &val
);
2064 val
&= rdev
->desc
->vsel_mask
;
2065 val
>>= ffs(rdev
->desc
->vsel_mask
) - 1;
2069 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap
);
2072 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2074 * @rdev: regulator to operate on
2075 * @sel: Selector to set
2077 * Regulators that use regmap for their register I/O can set the
2078 * vsel_reg and vsel_mask fields in their descriptor and then use this
2079 * as their set_voltage_vsel operation, saving some code.
2081 int regulator_set_voltage_sel_regmap(struct regulator_dev
*rdev
, unsigned sel
)
2085 sel
<<= ffs(rdev
->desc
->vsel_mask
) - 1;
2087 ret
= regmap_update_bits(rdev
->regmap
, rdev
->desc
->vsel_reg
,
2088 rdev
->desc
->vsel_mask
, sel
);
2092 if (rdev
->desc
->apply_bit
)
2093 ret
= regmap_update_bits(rdev
->regmap
, rdev
->desc
->apply_reg
,
2094 rdev
->desc
->apply_bit
,
2095 rdev
->desc
->apply_bit
);
2098 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap
);
2101 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2103 * @rdev: Regulator to operate on
2104 * @min_uV: Lower bound for voltage
2105 * @max_uV: Upper bound for voltage
2107 * Drivers implementing set_voltage_sel() and list_voltage() can use
2108 * this as their map_voltage() operation. It will find a suitable
2109 * voltage by calling list_voltage() until it gets something in bounds
2110 * for the requested voltages.
2112 int regulator_map_voltage_iterate(struct regulator_dev
*rdev
,
2113 int min_uV
, int max_uV
)
2115 int best_val
= INT_MAX
;
2119 /* Find the smallest voltage that falls within the specified
2122 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2123 ret
= rdev
->desc
->ops
->list_voltage(rdev
, i
);
2127 if (ret
< best_val
&& ret
>= min_uV
&& ret
<= max_uV
) {
2133 if (best_val
!= INT_MAX
)
2138 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate
);
2141 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2143 * @rdev: Regulator to operate on
2144 * @min_uV: Lower bound for voltage
2145 * @max_uV: Upper bound for voltage
2147 * Drivers providing min_uV and uV_step in their regulator_desc can
2148 * use this as their map_voltage() operation.
2150 int regulator_map_voltage_linear(struct regulator_dev
*rdev
,
2151 int min_uV
, int max_uV
)
2155 /* Allow uV_step to be 0 for fixed voltage */
2156 if (rdev
->desc
->n_voltages
== 1 && rdev
->desc
->uV_step
== 0) {
2157 if (min_uV
<= rdev
->desc
->min_uV
&& rdev
->desc
->min_uV
<= max_uV
)
2163 if (!rdev
->desc
->uV_step
) {
2164 BUG_ON(!rdev
->desc
->uV_step
);
2168 if (min_uV
< rdev
->desc
->min_uV
)
2169 min_uV
= rdev
->desc
->min_uV
;
2171 ret
= DIV_ROUND_UP(min_uV
- rdev
->desc
->min_uV
, rdev
->desc
->uV_step
);
2175 ret
+= rdev
->desc
->linear_min_sel
;
2177 /* Map back into a voltage to verify we're still in bounds */
2178 voltage
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2179 if (voltage
< min_uV
|| voltage
> max_uV
)
2184 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear
);
2186 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2187 int min_uV
, int max_uV
)
2192 unsigned int selector
;
2193 int old_selector
= -1;
2195 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2197 min_uV
+= rdev
->constraints
->uV_offset
;
2198 max_uV
+= rdev
->constraints
->uV_offset
;
2201 * If we can't obtain the old selector there is not enough
2202 * info to call set_voltage_time_sel().
2204 if (_regulator_is_enabled(rdev
) &&
2205 rdev
->desc
->ops
->set_voltage_time_sel
&&
2206 rdev
->desc
->ops
->get_voltage_sel
) {
2207 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2208 if (old_selector
< 0)
2209 return old_selector
;
2212 if (rdev
->desc
->ops
->set_voltage
) {
2213 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
,
2217 if (rdev
->desc
->ops
->list_voltage
)
2218 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2221 best_val
= _regulator_get_voltage(rdev
);
2224 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2225 if (rdev
->desc
->ops
->map_voltage
) {
2226 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2229 if (rdev
->desc
->ops
->list_voltage
==
2230 regulator_list_voltage_linear
)
2231 ret
= regulator_map_voltage_linear(rdev
,
2234 ret
= regulator_map_voltage_iterate(rdev
,
2239 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2240 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2242 if (old_selector
== selector
)
2245 ret
= rdev
->desc
->ops
->set_voltage_sel(
2255 /* Call set_voltage_time_sel if successfully obtained old_selector */
2256 if (ret
== 0 && _regulator_is_enabled(rdev
) && old_selector
>= 0 &&
2257 old_selector
!= selector
&& rdev
->desc
->ops
->set_voltage_time_sel
) {
2259 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2260 old_selector
, selector
);
2262 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2267 /* Insert any necessary delays */
2268 if (delay
>= 1000) {
2269 mdelay(delay
/ 1000);
2270 udelay(delay
% 1000);
2276 if (ret
== 0 && best_val
>= 0) {
2277 unsigned long data
= best_val
;
2279 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2283 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2289 * regulator_set_voltage - set regulator output voltage
2290 * @regulator: regulator source
2291 * @min_uV: Minimum required voltage in uV
2292 * @max_uV: Maximum acceptable voltage in uV
2294 * Sets a voltage regulator to the desired output voltage. This can be set
2295 * during any regulator state. IOW, regulator can be disabled or enabled.
2297 * If the regulator is enabled then the voltage will change to the new value
2298 * immediately otherwise if the regulator is disabled the regulator will
2299 * output at the new voltage when enabled.
2301 * NOTE: If the regulator is shared between several devices then the lowest
2302 * request voltage that meets the system constraints will be used.
2303 * Regulator system constraints must be set for this regulator before
2304 * calling this function otherwise this call will fail.
2306 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2308 struct regulator_dev
*rdev
= regulator
->rdev
;
2310 int old_min_uV
, old_max_uV
;
2312 mutex_lock(&rdev
->mutex
);
2314 /* If we're setting the same range as last time the change
2315 * should be a noop (some cpufreq implementations use the same
2316 * voltage for multiple frequencies, for example).
2318 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2322 if (!rdev
->desc
->ops
->set_voltage
&&
2323 !rdev
->desc
->ops
->set_voltage_sel
) {
2328 /* constraints check */
2329 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2333 /* restore original values in case of error */
2334 old_min_uV
= regulator
->min_uV
;
2335 old_max_uV
= regulator
->max_uV
;
2336 regulator
->min_uV
= min_uV
;
2337 regulator
->max_uV
= max_uV
;
2339 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2343 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2348 mutex_unlock(&rdev
->mutex
);
2351 regulator
->min_uV
= old_min_uV
;
2352 regulator
->max_uV
= old_max_uV
;
2353 mutex_unlock(&rdev
->mutex
);
2356 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2359 * regulator_set_voltage_time - get raise/fall time
2360 * @regulator: regulator source
2361 * @old_uV: starting voltage in microvolts
2362 * @new_uV: target voltage in microvolts
2364 * Provided with the starting and ending voltage, this function attempts to
2365 * calculate the time in microseconds required to rise or fall to this new
2368 int regulator_set_voltage_time(struct regulator
*regulator
,
2369 int old_uV
, int new_uV
)
2371 struct regulator_dev
*rdev
= regulator
->rdev
;
2372 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2378 /* Currently requires operations to do this */
2379 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2380 || !rdev
->desc
->n_voltages
)
2383 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2384 /* We only look for exact voltage matches here */
2385 voltage
= regulator_list_voltage(regulator
, i
);
2390 if (voltage
== old_uV
)
2392 if (voltage
== new_uV
)
2396 if (old_sel
< 0 || new_sel
< 0)
2399 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2401 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2404 * regulator_set_voltage_time_sel - get raise/fall time
2405 * @rdev: regulator source device
2406 * @old_selector: selector for starting voltage
2407 * @new_selector: selector for target voltage
2409 * Provided with the starting and target voltage selectors, this function
2410 * returns time in microseconds required to rise or fall to this new voltage
2412 * Drivers providing ramp_delay in regulation_constraints can use this as their
2413 * set_voltage_time_sel() operation.
2415 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2416 unsigned int old_selector
,
2417 unsigned int new_selector
)
2419 unsigned int ramp_delay
= 0;
2420 int old_volt
, new_volt
;
2422 if (rdev
->constraints
->ramp_delay
)
2423 ramp_delay
= rdev
->constraints
->ramp_delay
;
2424 else if (rdev
->desc
->ramp_delay
)
2425 ramp_delay
= rdev
->desc
->ramp_delay
;
2427 if (ramp_delay
== 0) {
2428 rdev_warn(rdev
, "ramp_delay not set\n");
2433 if (!rdev
->desc
->ops
->list_voltage
)
2436 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2437 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2439 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2441 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2444 * regulator_sync_voltage - re-apply last regulator output voltage
2445 * @regulator: regulator source
2447 * Re-apply the last configured voltage. This is intended to be used
2448 * where some external control source the consumer is cooperating with
2449 * has caused the configured voltage to change.
2451 int regulator_sync_voltage(struct regulator
*regulator
)
2453 struct regulator_dev
*rdev
= regulator
->rdev
;
2454 int ret
, min_uV
, max_uV
;
2456 mutex_lock(&rdev
->mutex
);
2458 if (!rdev
->desc
->ops
->set_voltage
&&
2459 !rdev
->desc
->ops
->set_voltage_sel
) {
2464 /* This is only going to work if we've had a voltage configured. */
2465 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2470 min_uV
= regulator
->min_uV
;
2471 max_uV
= regulator
->max_uV
;
2473 /* This should be a paranoia check... */
2474 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2478 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2482 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2485 mutex_unlock(&rdev
->mutex
);
2488 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2490 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2494 if (rdev
->desc
->ops
->get_voltage_sel
) {
2495 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2498 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2499 } else if (rdev
->desc
->ops
->get_voltage
) {
2500 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2501 } else if (rdev
->desc
->ops
->list_voltage
) {
2502 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2509 return ret
- rdev
->constraints
->uV_offset
;
2513 * regulator_get_voltage - get regulator output voltage
2514 * @regulator: regulator source
2516 * This returns the current regulator voltage in uV.
2518 * NOTE: If the regulator is disabled it will return the voltage value. This
2519 * function should not be used to determine regulator state.
2521 int regulator_get_voltage(struct regulator
*regulator
)
2525 mutex_lock(®ulator
->rdev
->mutex
);
2527 ret
= _regulator_get_voltage(regulator
->rdev
);
2529 mutex_unlock(®ulator
->rdev
->mutex
);
2533 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2536 * regulator_set_current_limit - set regulator output current limit
2537 * @regulator: regulator source
2538 * @min_uA: Minimuum supported current in uA
2539 * @max_uA: Maximum supported current in uA
2541 * Sets current sink to the desired output current. This can be set during
2542 * any regulator state. IOW, regulator can be disabled or enabled.
2544 * If the regulator is enabled then the current will change to the new value
2545 * immediately otherwise if the regulator is disabled the regulator will
2546 * output at the new current when enabled.
2548 * NOTE: Regulator system constraints must be set for this regulator before
2549 * calling this function otherwise this call will fail.
2551 int regulator_set_current_limit(struct regulator
*regulator
,
2552 int min_uA
, int max_uA
)
2554 struct regulator_dev
*rdev
= regulator
->rdev
;
2557 mutex_lock(&rdev
->mutex
);
2560 if (!rdev
->desc
->ops
->set_current_limit
) {
2565 /* constraints check */
2566 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2570 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2572 mutex_unlock(&rdev
->mutex
);
2575 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2577 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2581 mutex_lock(&rdev
->mutex
);
2584 if (!rdev
->desc
->ops
->get_current_limit
) {
2589 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2591 mutex_unlock(&rdev
->mutex
);
2596 * regulator_get_current_limit - get regulator output current
2597 * @regulator: regulator source
2599 * This returns the current supplied by the specified current sink in uA.
2601 * NOTE: If the regulator is disabled it will return the current value. This
2602 * function should not be used to determine regulator state.
2604 int regulator_get_current_limit(struct regulator
*regulator
)
2606 return _regulator_get_current_limit(regulator
->rdev
);
2608 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2611 * regulator_set_mode - set regulator operating mode
2612 * @regulator: regulator source
2613 * @mode: operating mode - one of the REGULATOR_MODE constants
2615 * Set regulator operating mode to increase regulator efficiency or improve
2616 * regulation performance.
2618 * NOTE: Regulator system constraints must be set for this regulator before
2619 * calling this function otherwise this call will fail.
2621 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2623 struct regulator_dev
*rdev
= regulator
->rdev
;
2625 int regulator_curr_mode
;
2627 mutex_lock(&rdev
->mutex
);
2630 if (!rdev
->desc
->ops
->set_mode
) {
2635 /* return if the same mode is requested */
2636 if (rdev
->desc
->ops
->get_mode
) {
2637 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2638 if (regulator_curr_mode
== mode
) {
2644 /* constraints check */
2645 ret
= regulator_mode_constrain(rdev
, &mode
);
2649 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2651 mutex_unlock(&rdev
->mutex
);
2654 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2656 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2660 mutex_lock(&rdev
->mutex
);
2663 if (!rdev
->desc
->ops
->get_mode
) {
2668 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2670 mutex_unlock(&rdev
->mutex
);
2675 * regulator_get_mode - get regulator operating mode
2676 * @regulator: regulator source
2678 * Get the current regulator operating mode.
2680 unsigned int regulator_get_mode(struct regulator
*regulator
)
2682 return _regulator_get_mode(regulator
->rdev
);
2684 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2687 * regulator_set_optimum_mode - set regulator optimum operating mode
2688 * @regulator: regulator source
2689 * @uA_load: load current
2691 * Notifies the regulator core of a new device load. This is then used by
2692 * DRMS (if enabled by constraints) to set the most efficient regulator
2693 * operating mode for the new regulator loading.
2695 * Consumer devices notify their supply regulator of the maximum power
2696 * they will require (can be taken from device datasheet in the power
2697 * consumption tables) when they change operational status and hence power
2698 * state. Examples of operational state changes that can affect power
2699 * consumption are :-
2701 * o Device is opened / closed.
2702 * o Device I/O is about to begin or has just finished.
2703 * o Device is idling in between work.
2705 * This information is also exported via sysfs to userspace.
2707 * DRMS will sum the total requested load on the regulator and change
2708 * to the most efficient operating mode if platform constraints allow.
2710 * Returns the new regulator mode or error.
2712 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
2714 struct regulator_dev
*rdev
= regulator
->rdev
;
2715 struct regulator
*consumer
;
2716 int ret
, output_uV
, input_uV
= 0, total_uA_load
= 0;
2720 input_uV
= regulator_get_voltage(rdev
->supply
);
2722 mutex_lock(&rdev
->mutex
);
2725 * first check to see if we can set modes at all, otherwise just
2726 * tell the consumer everything is OK.
2728 regulator
->uA_load
= uA_load
;
2729 ret
= regulator_check_drms(rdev
);
2735 if (!rdev
->desc
->ops
->get_optimum_mode
)
2739 * we can actually do this so any errors are indicators of
2740 * potential real failure.
2744 if (!rdev
->desc
->ops
->set_mode
)
2747 /* get output voltage */
2748 output_uV
= _regulator_get_voltage(rdev
);
2749 if (output_uV
<= 0) {
2750 rdev_err(rdev
, "invalid output voltage found\n");
2754 /* No supply? Use constraint voltage */
2756 input_uV
= rdev
->constraints
->input_uV
;
2757 if (input_uV
<= 0) {
2758 rdev_err(rdev
, "invalid input voltage found\n");
2762 /* calc total requested load for this regulator */
2763 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
2764 total_uA_load
+= consumer
->uA_load
;
2766 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
2767 input_uV
, output_uV
,
2769 ret
= regulator_mode_constrain(rdev
, &mode
);
2771 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2772 total_uA_load
, input_uV
, output_uV
);
2776 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2778 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
2783 mutex_unlock(&rdev
->mutex
);
2786 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
2789 * regulator_set_bypass_regmap - Default set_bypass() using regmap
2791 * @rdev: device to operate on.
2792 * @enable: state to set.
2794 int regulator_set_bypass_regmap(struct regulator_dev
*rdev
, bool enable
)
2799 val
= rdev
->desc
->bypass_mask
;
2803 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->bypass_reg
,
2804 rdev
->desc
->bypass_mask
, val
);
2806 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap
);
2809 * regulator_get_bypass_regmap - Default get_bypass() using regmap
2811 * @rdev: device to operate on.
2812 * @enable: current state.
2814 int regulator_get_bypass_regmap(struct regulator_dev
*rdev
, bool *enable
)
2819 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->bypass_reg
, &val
);
2823 *enable
= val
& rdev
->desc
->bypass_mask
;
2827 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap
);
2830 * regulator_allow_bypass - allow the regulator to go into bypass mode
2832 * @regulator: Regulator to configure
2833 * @enable: enable or disable bypass mode
2835 * Allow the regulator to go into bypass mode if all other consumers
2836 * for the regulator also enable bypass mode and the machine
2837 * constraints allow this. Bypass mode means that the regulator is
2838 * simply passing the input directly to the output with no regulation.
2840 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
2842 struct regulator_dev
*rdev
= regulator
->rdev
;
2845 if (!rdev
->desc
->ops
->set_bypass
)
2848 if (rdev
->constraints
&&
2849 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
2852 mutex_lock(&rdev
->mutex
);
2854 if (enable
&& !regulator
->bypass
) {
2855 rdev
->bypass_count
++;
2857 if (rdev
->bypass_count
== rdev
->open_count
) {
2858 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2860 rdev
->bypass_count
--;
2863 } else if (!enable
&& regulator
->bypass
) {
2864 rdev
->bypass_count
--;
2866 if (rdev
->bypass_count
!= rdev
->open_count
) {
2867 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2869 rdev
->bypass_count
++;
2874 regulator
->bypass
= enable
;
2876 mutex_unlock(&rdev
->mutex
);
2880 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
2883 * regulator_register_notifier - register regulator event notifier
2884 * @regulator: regulator source
2885 * @nb: notifier block
2887 * Register notifier block to receive regulator events.
2889 int regulator_register_notifier(struct regulator
*regulator
,
2890 struct notifier_block
*nb
)
2892 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
2895 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
2898 * regulator_unregister_notifier - unregister regulator event notifier
2899 * @regulator: regulator source
2900 * @nb: notifier block
2902 * Unregister regulator event notifier block.
2904 int regulator_unregister_notifier(struct regulator
*regulator
,
2905 struct notifier_block
*nb
)
2907 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
2910 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
2912 /* notify regulator consumers and downstream regulator consumers.
2913 * Note mutex must be held by caller.
2915 static void _notifier_call_chain(struct regulator_dev
*rdev
,
2916 unsigned long event
, void *data
)
2918 /* call rdev chain first */
2919 blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
2923 * regulator_bulk_get - get multiple regulator consumers
2925 * @dev: Device to supply
2926 * @num_consumers: Number of consumers to register
2927 * @consumers: Configuration of consumers; clients are stored here.
2929 * @return 0 on success, an errno on failure.
2931 * This helper function allows drivers to get several regulator
2932 * consumers in one operation. If any of the regulators cannot be
2933 * acquired then any regulators that were allocated will be freed
2934 * before returning to the caller.
2936 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
2937 struct regulator_bulk_data
*consumers
)
2942 for (i
= 0; i
< num_consumers
; i
++)
2943 consumers
[i
].consumer
= NULL
;
2945 for (i
= 0; i
< num_consumers
; i
++) {
2946 consumers
[i
].consumer
= regulator_get(dev
,
2947 consumers
[i
].supply
);
2948 if (IS_ERR(consumers
[i
].consumer
)) {
2949 ret
= PTR_ERR(consumers
[i
].consumer
);
2950 dev_err(dev
, "Failed to get supply '%s': %d\n",
2951 consumers
[i
].supply
, ret
);
2952 consumers
[i
].consumer
= NULL
;
2961 regulator_put(consumers
[i
].consumer
);
2965 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
2968 * devm_regulator_bulk_get - managed get multiple regulator consumers
2970 * @dev: Device to supply
2971 * @num_consumers: Number of consumers to register
2972 * @consumers: Configuration of consumers; clients are stored here.
2974 * @return 0 on success, an errno on failure.
2976 * This helper function allows drivers to get several regulator
2977 * consumers in one operation with management, the regulators will
2978 * automatically be freed when the device is unbound. If any of the
2979 * regulators cannot be acquired then any regulators that were
2980 * allocated will be freed before returning to the caller.
2982 int devm_regulator_bulk_get(struct device
*dev
, int num_consumers
,
2983 struct regulator_bulk_data
*consumers
)
2988 for (i
= 0; i
< num_consumers
; i
++)
2989 consumers
[i
].consumer
= NULL
;
2991 for (i
= 0; i
< num_consumers
; i
++) {
2992 consumers
[i
].consumer
= devm_regulator_get(dev
,
2993 consumers
[i
].supply
);
2994 if (IS_ERR(consumers
[i
].consumer
)) {
2995 ret
= PTR_ERR(consumers
[i
].consumer
);
2996 dev_err(dev
, "Failed to get supply '%s': %d\n",
2997 consumers
[i
].supply
, ret
);
2998 consumers
[i
].consumer
= NULL
;
3006 for (i
= 0; i
< num_consumers
&& consumers
[i
].consumer
; i
++)
3007 devm_regulator_put(consumers
[i
].consumer
);
3011 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get
);
3013 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3015 struct regulator_bulk_data
*bulk
= data
;
3017 bulk
->ret
= regulator_enable(bulk
->consumer
);
3021 * regulator_bulk_enable - enable multiple regulator consumers
3023 * @num_consumers: Number of consumers
3024 * @consumers: Consumer data; clients are stored here.
3025 * @return 0 on success, an errno on failure
3027 * This convenience API allows consumers to enable multiple regulator
3028 * clients in a single API call. If any consumers cannot be enabled
3029 * then any others that were enabled will be disabled again prior to
3032 int regulator_bulk_enable(int num_consumers
,
3033 struct regulator_bulk_data
*consumers
)
3035 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3039 for (i
= 0; i
< num_consumers
; i
++) {
3040 if (consumers
[i
].consumer
->always_on
)
3041 consumers
[i
].ret
= 0;
3043 async_schedule_domain(regulator_bulk_enable_async
,
3044 &consumers
[i
], &async_domain
);
3047 async_synchronize_full_domain(&async_domain
);
3049 /* If any consumer failed we need to unwind any that succeeded */
3050 for (i
= 0; i
< num_consumers
; i
++) {
3051 if (consumers
[i
].ret
!= 0) {
3052 ret
= consumers
[i
].ret
;
3060 for (i
= 0; i
< num_consumers
; i
++) {
3061 if (consumers
[i
].ret
< 0)
3062 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3065 regulator_disable(consumers
[i
].consumer
);
3070 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3073 * regulator_bulk_disable - disable multiple regulator consumers
3075 * @num_consumers: Number of consumers
3076 * @consumers: Consumer data; clients are stored here.
3077 * @return 0 on success, an errno on failure
3079 * This convenience API allows consumers to disable multiple regulator
3080 * clients in a single API call. If any consumers cannot be disabled
3081 * then any others that were disabled will be enabled again prior to
3084 int regulator_bulk_disable(int num_consumers
,
3085 struct regulator_bulk_data
*consumers
)
3090 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3091 ret
= regulator_disable(consumers
[i
].consumer
);
3099 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3100 for (++i
; i
< num_consumers
; ++i
) {
3101 r
= regulator_enable(consumers
[i
].consumer
);
3103 pr_err("Failed to reename %s: %d\n",
3104 consumers
[i
].supply
, r
);
3109 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3112 * regulator_bulk_force_disable - force disable multiple regulator consumers
3114 * @num_consumers: Number of consumers
3115 * @consumers: Consumer data; clients are stored here.
3116 * @return 0 on success, an errno on failure
3118 * This convenience API allows consumers to forcibly disable multiple regulator
3119 * clients in a single API call.
3120 * NOTE: This should be used for situations when device damage will
3121 * likely occur if the regulators are not disabled (e.g. over temp).
3122 * Although regulator_force_disable function call for some consumers can
3123 * return error numbers, the function is called for all consumers.
3125 int regulator_bulk_force_disable(int num_consumers
,
3126 struct regulator_bulk_data
*consumers
)
3131 for (i
= 0; i
< num_consumers
; i
++)
3133 regulator_force_disable(consumers
[i
].consumer
);
3135 for (i
= 0; i
< num_consumers
; i
++) {
3136 if (consumers
[i
].ret
!= 0) {
3137 ret
= consumers
[i
].ret
;
3146 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3149 * regulator_bulk_free - free multiple regulator consumers
3151 * @num_consumers: Number of consumers
3152 * @consumers: Consumer data; clients are stored here.
3154 * This convenience API allows consumers to free multiple regulator
3155 * clients in a single API call.
3157 void regulator_bulk_free(int num_consumers
,
3158 struct regulator_bulk_data
*consumers
)
3162 for (i
= 0; i
< num_consumers
; i
++) {
3163 regulator_put(consumers
[i
].consumer
);
3164 consumers
[i
].consumer
= NULL
;
3167 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3170 * regulator_notifier_call_chain - call regulator event notifier
3171 * @rdev: regulator source
3172 * @event: notifier block
3173 * @data: callback-specific data.
3175 * Called by regulator drivers to notify clients a regulator event has
3176 * occurred. We also notify regulator clients downstream.
3177 * Note lock must be held by caller.
3179 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3180 unsigned long event
, void *data
)
3182 _notifier_call_chain(rdev
, event
, data
);
3186 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3189 * regulator_mode_to_status - convert a regulator mode into a status
3191 * @mode: Mode to convert
3193 * Convert a regulator mode into a status.
3195 int regulator_mode_to_status(unsigned int mode
)
3198 case REGULATOR_MODE_FAST
:
3199 return REGULATOR_STATUS_FAST
;
3200 case REGULATOR_MODE_NORMAL
:
3201 return REGULATOR_STATUS_NORMAL
;
3202 case REGULATOR_MODE_IDLE
:
3203 return REGULATOR_STATUS_IDLE
;
3204 case REGULATOR_MODE_STANDBY
:
3205 return REGULATOR_STATUS_STANDBY
;
3207 return REGULATOR_STATUS_UNDEFINED
;
3210 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3213 * To avoid cluttering sysfs (and memory) with useless state, only
3214 * create attributes that can be meaningfully displayed.
3216 static int add_regulator_attributes(struct regulator_dev
*rdev
)
3218 struct device
*dev
= &rdev
->dev
;
3219 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3222 /* some attributes need specific methods to be displayed */
3223 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3224 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3225 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0)) {
3226 status
= device_create_file(dev
, &dev_attr_microvolts
);
3230 if (ops
->get_current_limit
) {
3231 status
= device_create_file(dev
, &dev_attr_microamps
);
3235 if (ops
->get_mode
) {
3236 status
= device_create_file(dev
, &dev_attr_opmode
);
3240 if (rdev
->ena_gpio
|| ops
->is_enabled
) {
3241 status
= device_create_file(dev
, &dev_attr_state
);
3245 if (ops
->get_status
) {
3246 status
= device_create_file(dev
, &dev_attr_status
);
3250 if (ops
->get_bypass
) {
3251 status
= device_create_file(dev
, &dev_attr_bypass
);
3256 /* some attributes are type-specific */
3257 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
3258 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
3263 /* all the other attributes exist to support constraints;
3264 * don't show them if there are no constraints, or if the
3265 * relevant supporting methods are missing.
3267 if (!rdev
->constraints
)
3270 /* constraints need specific supporting methods */
3271 if (ops
->set_voltage
|| ops
->set_voltage_sel
) {
3272 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
3275 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
3279 if (ops
->set_current_limit
) {
3280 status
= device_create_file(dev
, &dev_attr_min_microamps
);
3283 status
= device_create_file(dev
, &dev_attr_max_microamps
);
3288 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
3291 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
3294 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
3298 if (ops
->set_suspend_voltage
) {
3299 status
= device_create_file(dev
,
3300 &dev_attr_suspend_standby_microvolts
);
3303 status
= device_create_file(dev
,
3304 &dev_attr_suspend_mem_microvolts
);
3307 status
= device_create_file(dev
,
3308 &dev_attr_suspend_disk_microvolts
);
3313 if (ops
->set_suspend_mode
) {
3314 status
= device_create_file(dev
,
3315 &dev_attr_suspend_standby_mode
);
3318 status
= device_create_file(dev
,
3319 &dev_attr_suspend_mem_mode
);
3322 status
= device_create_file(dev
,
3323 &dev_attr_suspend_disk_mode
);
3331 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3333 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3334 if (!rdev
->debugfs
) {
3335 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3339 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3341 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3343 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3344 &rdev
->bypass_count
);
3348 * regulator_register - register regulator
3349 * @regulator_desc: regulator to register
3350 * @config: runtime configuration for regulator
3352 * Called by regulator drivers to register a regulator.
3353 * Returns a valid pointer to struct regulator_dev on success
3354 * or an ERR_PTR() on error.
3356 struct regulator_dev
*
3357 regulator_register(const struct regulator_desc
*regulator_desc
,
3358 const struct regulator_config
*config
)
3360 const struct regulation_constraints
*constraints
= NULL
;
3361 const struct regulator_init_data
*init_data
;
3362 static atomic_t regulator_no
= ATOMIC_INIT(0);
3363 struct regulator_dev
*rdev
;
3366 const char *supply
= NULL
;
3368 if (regulator_desc
== NULL
|| config
== NULL
)
3369 return ERR_PTR(-EINVAL
);
3374 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3375 return ERR_PTR(-EINVAL
);
3377 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3378 regulator_desc
->type
!= REGULATOR_CURRENT
)
3379 return ERR_PTR(-EINVAL
);
3381 /* Only one of each should be implemented */
3382 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3383 regulator_desc
->ops
->get_voltage_sel
);
3384 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3385 regulator_desc
->ops
->set_voltage_sel
);
3387 /* If we're using selectors we must implement list_voltage. */
3388 if (regulator_desc
->ops
->get_voltage_sel
&&
3389 !regulator_desc
->ops
->list_voltage
) {
3390 return ERR_PTR(-EINVAL
);
3392 if (regulator_desc
->ops
->set_voltage_sel
&&
3393 !regulator_desc
->ops
->list_voltage
) {
3394 return ERR_PTR(-EINVAL
);
3397 init_data
= config
->init_data
;
3399 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3401 return ERR_PTR(-ENOMEM
);
3403 mutex_lock(®ulator_list_mutex
);
3405 mutex_init(&rdev
->mutex
);
3406 rdev
->reg_data
= config
->driver_data
;
3407 rdev
->owner
= regulator_desc
->owner
;
3408 rdev
->desc
= regulator_desc
;
3410 rdev
->regmap
= config
->regmap
;
3411 else if (dev_get_regmap(dev
, NULL
))
3412 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3413 else if (dev
->parent
)
3414 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3415 INIT_LIST_HEAD(&rdev
->consumer_list
);
3416 INIT_LIST_HEAD(&rdev
->list
);
3417 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3418 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3420 /* preform any regulator specific init */
3421 if (init_data
&& init_data
->regulator_init
) {
3422 ret
= init_data
->regulator_init(rdev
->reg_data
);
3427 /* register with sysfs */
3428 rdev
->dev
.class = ®ulator_class
;
3429 rdev
->dev
.of_node
= config
->of_node
;
3430 rdev
->dev
.parent
= dev
;
3431 dev_set_name(&rdev
->dev
, "regulator.%d",
3432 atomic_inc_return(®ulator_no
) - 1);
3433 ret
= device_register(&rdev
->dev
);
3435 put_device(&rdev
->dev
);
3439 dev_set_drvdata(&rdev
->dev
, rdev
);
3441 if (config
->ena_gpio
&& gpio_is_valid(config
->ena_gpio
)) {
3442 ret
= gpio_request_one(config
->ena_gpio
,
3443 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
3444 rdev_get_name(rdev
));
3446 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3447 config
->ena_gpio
, ret
);
3451 rdev
->ena_gpio
= config
->ena_gpio
;
3452 rdev
->ena_gpio_invert
= config
->ena_gpio_invert
;
3454 if (config
->ena_gpio_flags
& GPIOF_OUT_INIT_HIGH
)
3455 rdev
->ena_gpio_state
= 1;
3457 if (rdev
->ena_gpio_invert
)
3458 rdev
->ena_gpio_state
= !rdev
->ena_gpio_state
;
3461 /* set regulator constraints */
3463 constraints
= &init_data
->constraints
;
3465 ret
= set_machine_constraints(rdev
, constraints
);
3469 /* add attributes supported by this regulator */
3470 ret
= add_regulator_attributes(rdev
);
3474 if (init_data
&& init_data
->supply_regulator
)
3475 supply
= init_data
->supply_regulator
;
3476 else if (regulator_desc
->supply_name
)
3477 supply
= regulator_desc
->supply_name
;
3480 struct regulator_dev
*r
;
3482 r
= regulator_dev_lookup(dev
, supply
, &ret
);
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
);
3502 /* add consumers devices */
3504 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3505 ret
= set_consumer_device_supply(rdev
,
3506 init_data
->consumer_supplies
[i
].dev_name
,
3507 init_data
->consumer_supplies
[i
].supply
);
3509 dev_err(dev
, "Failed to set supply %s\n",
3510 init_data
->consumer_supplies
[i
].supply
);
3511 goto unset_supplies
;
3516 list_add(&rdev
->list
, ®ulator_list
);
3518 rdev_init_debugfs(rdev
);
3520 mutex_unlock(®ulator_list_mutex
);
3524 unset_regulator_supplies(rdev
);
3528 _regulator_put(rdev
->supply
);
3530 gpio_free(rdev
->ena_gpio
);
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 regulator_put(rdev
->supply
);
3558 mutex_lock(®ulator_list_mutex
);
3559 debugfs_remove_recursive(rdev
->debugfs
);
3560 flush_work(&rdev
->disable_work
.work
);
3561 WARN_ON(rdev
->open_count
);
3562 unset_regulator_supplies(rdev
);
3563 list_del(&rdev
->list
);
3564 kfree(rdev
->constraints
);
3566 gpio_free(rdev
->ena_gpio
);
3567 device_unregister(&rdev
->dev
);
3568 mutex_unlock(®ulator_list_mutex
);
3570 EXPORT_SYMBOL_GPL(regulator_unregister
);
3573 * regulator_suspend_prepare - prepare regulators for system wide suspend
3574 * @state: system suspend state
3576 * Configure each regulator with it's suspend operating parameters for state.
3577 * This will usually be called by machine suspend code prior to supending.
3579 int regulator_suspend_prepare(suspend_state_t state
)
3581 struct regulator_dev
*rdev
;
3584 /* ON is handled by regulator active state */
3585 if (state
== PM_SUSPEND_ON
)
3588 mutex_lock(®ulator_list_mutex
);
3589 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3591 mutex_lock(&rdev
->mutex
);
3592 ret
= suspend_prepare(rdev
, state
);
3593 mutex_unlock(&rdev
->mutex
);
3596 rdev_err(rdev
, "failed to prepare\n");
3601 mutex_unlock(®ulator_list_mutex
);
3604 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3607 * regulator_suspend_finish - resume regulators from system wide suspend
3609 * Turn on regulators that might be turned off by regulator_suspend_prepare
3610 * and that should be turned on according to the regulators properties.
3612 int regulator_suspend_finish(void)
3614 struct regulator_dev
*rdev
;
3617 mutex_lock(®ulator_list_mutex
);
3618 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3619 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3621 mutex_lock(&rdev
->mutex
);
3622 if ((rdev
->use_count
> 0 || rdev
->constraints
->always_on
) &&
3624 error
= ops
->enable(rdev
);
3628 if (!has_full_constraints
)
3632 if (!_regulator_is_enabled(rdev
))
3635 error
= ops
->disable(rdev
);
3640 mutex_unlock(&rdev
->mutex
);
3642 mutex_unlock(®ulator_list_mutex
);
3645 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3648 * regulator_has_full_constraints - the system has fully specified constraints
3650 * Calling this function will cause the regulator API to disable all
3651 * regulators which have a zero use count and don't have an always_on
3652 * constraint in a late_initcall.
3654 * The intention is that this will become the default behaviour in a
3655 * future kernel release so users are encouraged to use this facility
3658 void regulator_has_full_constraints(void)
3660 has_full_constraints
= 1;
3662 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3665 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3667 * Calling this function will cause the regulator API to provide a
3668 * dummy regulator to consumers if no physical regulator is found,
3669 * allowing most consumers to proceed as though a regulator were
3670 * configured. This allows systems such as those with software
3671 * controllable regulators for the CPU core only to be brought up more
3674 void regulator_use_dummy_regulator(void)
3676 board_wants_dummy_regulator
= true;
3678 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator
);
3681 * rdev_get_drvdata - get rdev regulator driver data
3684 * Get rdev regulator driver private data. This call can be used in the
3685 * regulator driver context.
3687 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3689 return rdev
->reg_data
;
3691 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3694 * regulator_get_drvdata - get regulator driver data
3695 * @regulator: regulator
3697 * Get regulator driver private data. This call can be used in the consumer
3698 * driver context when non API regulator specific functions need to be called.
3700 void *regulator_get_drvdata(struct regulator
*regulator
)
3702 return regulator
->rdev
->reg_data
;
3704 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3707 * regulator_set_drvdata - set regulator driver data
3708 * @regulator: regulator
3711 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3713 regulator
->rdev
->reg_data
= data
;
3715 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3718 * regulator_get_id - get regulator ID
3721 int rdev_get_id(struct regulator_dev
*rdev
)
3723 return rdev
->desc
->id
;
3725 EXPORT_SYMBOL_GPL(rdev_get_id
);
3727 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3731 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3733 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3735 return reg_init_data
->driver_data
;
3737 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3739 #ifdef CONFIG_DEBUG_FS
3740 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3741 size_t count
, loff_t
*ppos
)
3743 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3744 ssize_t len
, ret
= 0;
3745 struct regulator_map
*map
;
3750 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3751 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3753 rdev_get_name(map
->regulator
), map
->dev_name
,
3757 if (ret
> PAGE_SIZE
) {
3763 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3771 static const struct file_operations supply_map_fops
= {
3772 #ifdef CONFIG_DEBUG_FS
3773 .read
= supply_map_read_file
,
3774 .llseek
= default_llseek
,
3778 static int __init
regulator_init(void)
3782 ret
= class_register(®ulator_class
);
3784 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3786 pr_warn("regulator: Failed to create debugfs directory\n");
3788 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3791 regulator_dummy_init();
3796 /* init early to allow our consumers to complete system booting */
3797 core_initcall(regulator_init
);
3799 static int __init
regulator_init_complete(void)
3801 struct regulator_dev
*rdev
;
3802 struct regulator_ops
*ops
;
3803 struct regulation_constraints
*c
;
3807 * Since DT doesn't provide an idiomatic mechanism for
3808 * enabling full constraints and since it's much more natural
3809 * with DT to provide them just assume that a DT enabled
3810 * system has full constraints.
3812 if (of_have_populated_dt())
3813 has_full_constraints
= true;
3815 mutex_lock(®ulator_list_mutex
);
3817 /* If we have a full configuration then disable any regulators
3818 * which are not in use or always_on. This will become the
3819 * default behaviour in the future.
3821 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3822 ops
= rdev
->desc
->ops
;
3823 c
= rdev
->constraints
;
3825 if (!ops
->disable
|| (c
&& c
->always_on
))
3828 mutex_lock(&rdev
->mutex
);
3830 if (rdev
->use_count
)
3833 /* If we can't read the status assume it's on. */
3834 if (ops
->is_enabled
)
3835 enabled
= ops
->is_enabled(rdev
);
3842 if (has_full_constraints
) {
3843 /* We log since this may kill the system if it
3845 rdev_info(rdev
, "disabling\n");
3846 ret
= ops
->disable(rdev
);
3848 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
3851 /* The intention is that in future we will
3852 * assume that full constraints are provided
3853 * so warn even if we aren't going to do
3856 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
3860 mutex_unlock(&rdev
->mutex
);
3863 mutex_unlock(®ulator_list_mutex
);
3867 late_initcall(regulator_init_complete
);