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 LIST_HEAD(regulator_ena_gpio_list
);
55 static bool has_full_constraints
;
56 static bool board_wants_dummy_regulator
;
58 static struct dentry
*debugfs_root
;
61 * struct regulator_map
63 * Used to provide symbolic supply names to devices.
65 struct regulator_map
{
66 struct list_head list
;
67 const char *dev_name
; /* The dev_name() for the consumer */
69 struct regulator_dev
*regulator
;
73 * struct regulator_enable_gpio
75 * Management for shared enable GPIO pin
77 struct regulator_enable_gpio
{
78 struct list_head list
;
80 u32 enable_count
; /* a number of enabled shared GPIO */
81 u32 request_count
; /* a number of requested shared GPIO */
82 unsigned int ena_gpio_invert
:1;
88 * One for each consumer device.
92 struct list_head list
;
93 unsigned int always_on
:1;
94 unsigned int bypass
:1;
99 struct device_attribute dev_attr
;
100 struct regulator_dev
*rdev
;
101 struct dentry
*debugfs
;
104 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
105 static int _regulator_disable(struct regulator_dev
*rdev
);
106 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
107 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
108 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
109 static void _notifier_call_chain(struct regulator_dev
*rdev
,
110 unsigned long event
, void *data
);
111 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
112 int min_uV
, int max_uV
);
113 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
115 const char *supply_name
);
117 static const char *rdev_get_name(struct regulator_dev
*rdev
)
119 if (rdev
->constraints
&& rdev
->constraints
->name
)
120 return rdev
->constraints
->name
;
121 else if (rdev
->desc
->name
)
122 return rdev
->desc
->name
;
128 * of_get_regulator - get a regulator device node based on supply name
129 * @dev: Device pointer for the consumer (of regulator) device
130 * @supply: regulator supply name
132 * Extract the regulator device node corresponding to the supply name.
133 * returns the device node corresponding to the regulator if found, else
136 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
138 struct device_node
*regnode
= NULL
;
139 char prop_name
[32]; /* 32 is max size of property name */
141 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
143 snprintf(prop_name
, 32, "%s-supply", supply
);
144 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
147 dev_dbg(dev
, "Looking up %s property in node %s failed",
148 prop_name
, dev
->of_node
->full_name
);
154 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
156 if (!rdev
->constraints
)
159 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
165 /* Platform voltage constraint check */
166 static int regulator_check_voltage(struct regulator_dev
*rdev
,
167 int *min_uV
, int *max_uV
)
169 BUG_ON(*min_uV
> *max_uV
);
171 if (!rdev
->constraints
) {
172 rdev_err(rdev
, "no constraints\n");
175 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
176 rdev_err(rdev
, "operation not allowed\n");
180 if (*max_uV
> rdev
->constraints
->max_uV
)
181 *max_uV
= rdev
->constraints
->max_uV
;
182 if (*min_uV
< rdev
->constraints
->min_uV
)
183 *min_uV
= rdev
->constraints
->min_uV
;
185 if (*min_uV
> *max_uV
) {
186 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
194 /* Make sure we select a voltage that suits the needs of all
195 * regulator consumers
197 static int regulator_check_consumers(struct regulator_dev
*rdev
,
198 int *min_uV
, int *max_uV
)
200 struct regulator
*regulator
;
202 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
204 * Assume consumers that didn't say anything are OK
205 * with anything in the constraint range.
207 if (!regulator
->min_uV
&& !regulator
->max_uV
)
210 if (*max_uV
> regulator
->max_uV
)
211 *max_uV
= regulator
->max_uV
;
212 if (*min_uV
< regulator
->min_uV
)
213 *min_uV
= regulator
->min_uV
;
216 if (*min_uV
> *max_uV
) {
217 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
225 /* current constraint check */
226 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
227 int *min_uA
, int *max_uA
)
229 BUG_ON(*min_uA
> *max_uA
);
231 if (!rdev
->constraints
) {
232 rdev_err(rdev
, "no constraints\n");
235 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
236 rdev_err(rdev
, "operation not allowed\n");
240 if (*max_uA
> rdev
->constraints
->max_uA
)
241 *max_uA
= rdev
->constraints
->max_uA
;
242 if (*min_uA
< rdev
->constraints
->min_uA
)
243 *min_uA
= rdev
->constraints
->min_uA
;
245 if (*min_uA
> *max_uA
) {
246 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
254 /* operating mode constraint check */
255 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
258 case REGULATOR_MODE_FAST
:
259 case REGULATOR_MODE_NORMAL
:
260 case REGULATOR_MODE_IDLE
:
261 case REGULATOR_MODE_STANDBY
:
264 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
268 if (!rdev
->constraints
) {
269 rdev_err(rdev
, "no constraints\n");
272 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
273 rdev_err(rdev
, "operation not allowed\n");
277 /* The modes are bitmasks, the most power hungry modes having
278 * the lowest values. If the requested mode isn't supported
279 * try higher modes. */
281 if (rdev
->constraints
->valid_modes_mask
& *mode
)
289 /* dynamic regulator mode switching constraint check */
290 static int regulator_check_drms(struct regulator_dev
*rdev
)
292 if (!rdev
->constraints
) {
293 rdev_err(rdev
, "no constraints\n");
296 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
297 rdev_err(rdev
, "operation not allowed\n");
303 static ssize_t
regulator_uV_show(struct device
*dev
,
304 struct device_attribute
*attr
, char *buf
)
306 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
309 mutex_lock(&rdev
->mutex
);
310 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
311 mutex_unlock(&rdev
->mutex
);
315 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
317 static ssize_t
regulator_uA_show(struct device
*dev
,
318 struct device_attribute
*attr
, char *buf
)
320 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
322 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
324 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
326 static ssize_t
regulator_name_show(struct device
*dev
,
327 struct device_attribute
*attr
, char *buf
)
329 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
331 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
334 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
337 case REGULATOR_MODE_FAST
:
338 return sprintf(buf
, "fast\n");
339 case REGULATOR_MODE_NORMAL
:
340 return sprintf(buf
, "normal\n");
341 case REGULATOR_MODE_IDLE
:
342 return sprintf(buf
, "idle\n");
343 case REGULATOR_MODE_STANDBY
:
344 return sprintf(buf
, "standby\n");
346 return sprintf(buf
, "unknown\n");
349 static ssize_t
regulator_opmode_show(struct device
*dev
,
350 struct device_attribute
*attr
, char *buf
)
352 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
354 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
356 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
358 static ssize_t
regulator_print_state(char *buf
, int state
)
361 return sprintf(buf
, "enabled\n");
363 return sprintf(buf
, "disabled\n");
365 return sprintf(buf
, "unknown\n");
368 static ssize_t
regulator_state_show(struct device
*dev
,
369 struct device_attribute
*attr
, char *buf
)
371 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
374 mutex_lock(&rdev
->mutex
);
375 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
376 mutex_unlock(&rdev
->mutex
);
380 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
382 static ssize_t
regulator_status_show(struct device
*dev
,
383 struct device_attribute
*attr
, char *buf
)
385 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
389 status
= rdev
->desc
->ops
->get_status(rdev
);
394 case REGULATOR_STATUS_OFF
:
397 case REGULATOR_STATUS_ON
:
400 case REGULATOR_STATUS_ERROR
:
403 case REGULATOR_STATUS_FAST
:
406 case REGULATOR_STATUS_NORMAL
:
409 case REGULATOR_STATUS_IDLE
:
412 case REGULATOR_STATUS_STANDBY
:
415 case REGULATOR_STATUS_BYPASS
:
418 case REGULATOR_STATUS_UNDEFINED
:
425 return sprintf(buf
, "%s\n", label
);
427 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
429 static ssize_t
regulator_min_uA_show(struct device
*dev
,
430 struct device_attribute
*attr
, char *buf
)
432 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
434 if (!rdev
->constraints
)
435 return sprintf(buf
, "constraint not defined\n");
437 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
439 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
441 static ssize_t
regulator_max_uA_show(struct device
*dev
,
442 struct device_attribute
*attr
, char *buf
)
444 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
446 if (!rdev
->constraints
)
447 return sprintf(buf
, "constraint not defined\n");
449 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
451 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
453 static ssize_t
regulator_min_uV_show(struct device
*dev
,
454 struct device_attribute
*attr
, char *buf
)
456 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
458 if (!rdev
->constraints
)
459 return sprintf(buf
, "constraint not defined\n");
461 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
463 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
465 static ssize_t
regulator_max_uV_show(struct device
*dev
,
466 struct device_attribute
*attr
, char *buf
)
468 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
470 if (!rdev
->constraints
)
471 return sprintf(buf
, "constraint not defined\n");
473 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
475 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
477 static ssize_t
regulator_total_uA_show(struct device
*dev
,
478 struct device_attribute
*attr
, char *buf
)
480 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
481 struct regulator
*regulator
;
484 mutex_lock(&rdev
->mutex
);
485 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
486 uA
+= regulator
->uA_load
;
487 mutex_unlock(&rdev
->mutex
);
488 return sprintf(buf
, "%d\n", uA
);
490 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
492 static ssize_t
regulator_num_users_show(struct device
*dev
,
493 struct device_attribute
*attr
, char *buf
)
495 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
496 return sprintf(buf
, "%d\n", rdev
->use_count
);
499 static ssize_t
regulator_type_show(struct device
*dev
,
500 struct device_attribute
*attr
, char *buf
)
502 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
504 switch (rdev
->desc
->type
) {
505 case REGULATOR_VOLTAGE
:
506 return sprintf(buf
, "voltage\n");
507 case REGULATOR_CURRENT
:
508 return sprintf(buf
, "current\n");
510 return sprintf(buf
, "unknown\n");
513 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
514 struct device_attribute
*attr
, char *buf
)
516 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
518 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
520 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
521 regulator_suspend_mem_uV_show
, NULL
);
523 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
524 struct device_attribute
*attr
, char *buf
)
526 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
528 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
530 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
531 regulator_suspend_disk_uV_show
, NULL
);
533 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
534 struct device_attribute
*attr
, char *buf
)
536 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
538 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
540 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
541 regulator_suspend_standby_uV_show
, NULL
);
543 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
544 struct device_attribute
*attr
, char *buf
)
546 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
548 return regulator_print_opmode(buf
,
549 rdev
->constraints
->state_mem
.mode
);
551 static DEVICE_ATTR(suspend_mem_mode
, 0444,
552 regulator_suspend_mem_mode_show
, NULL
);
554 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
555 struct device_attribute
*attr
, char *buf
)
557 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
559 return regulator_print_opmode(buf
,
560 rdev
->constraints
->state_disk
.mode
);
562 static DEVICE_ATTR(suspend_disk_mode
, 0444,
563 regulator_suspend_disk_mode_show
, NULL
);
565 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
566 struct device_attribute
*attr
, char *buf
)
568 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
570 return regulator_print_opmode(buf
,
571 rdev
->constraints
->state_standby
.mode
);
573 static DEVICE_ATTR(suspend_standby_mode
, 0444,
574 regulator_suspend_standby_mode_show
, NULL
);
576 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
577 struct device_attribute
*attr
, char *buf
)
579 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
581 return regulator_print_state(buf
,
582 rdev
->constraints
->state_mem
.enabled
);
584 static DEVICE_ATTR(suspend_mem_state
, 0444,
585 regulator_suspend_mem_state_show
, NULL
);
587 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
588 struct device_attribute
*attr
, char *buf
)
590 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
592 return regulator_print_state(buf
,
593 rdev
->constraints
->state_disk
.enabled
);
595 static DEVICE_ATTR(suspend_disk_state
, 0444,
596 regulator_suspend_disk_state_show
, NULL
);
598 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
599 struct device_attribute
*attr
, char *buf
)
601 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
603 return regulator_print_state(buf
,
604 rdev
->constraints
->state_standby
.enabled
);
606 static DEVICE_ATTR(suspend_standby_state
, 0444,
607 regulator_suspend_standby_state_show
, NULL
);
609 static ssize_t
regulator_bypass_show(struct device
*dev
,
610 struct device_attribute
*attr
, char *buf
)
612 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
617 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
626 return sprintf(buf
, "%s\n", report
);
628 static DEVICE_ATTR(bypass
, 0444,
629 regulator_bypass_show
, NULL
);
632 * These are the only attributes are present for all regulators.
633 * Other attributes are a function of regulator functionality.
635 static struct device_attribute regulator_dev_attrs
[] = {
636 __ATTR(name
, 0444, regulator_name_show
, NULL
),
637 __ATTR(num_users
, 0444, regulator_num_users_show
, NULL
),
638 __ATTR(type
, 0444, regulator_type_show
, NULL
),
642 static void regulator_dev_release(struct device
*dev
)
644 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
648 static struct class regulator_class
= {
650 .dev_release
= regulator_dev_release
,
651 .dev_attrs
= regulator_dev_attrs
,
654 /* Calculate the new optimum regulator operating mode based on the new total
655 * consumer load. All locks held by caller */
656 static void drms_uA_update(struct regulator_dev
*rdev
)
658 struct regulator
*sibling
;
659 int current_uA
= 0, output_uV
, input_uV
, err
;
662 err
= regulator_check_drms(rdev
);
663 if (err
< 0 || !rdev
->desc
->ops
->get_optimum_mode
||
664 (!rdev
->desc
->ops
->get_voltage
&&
665 !rdev
->desc
->ops
->get_voltage_sel
) ||
666 !rdev
->desc
->ops
->set_mode
)
669 /* get output voltage */
670 output_uV
= _regulator_get_voltage(rdev
);
674 /* get input voltage */
677 input_uV
= regulator_get_voltage(rdev
->supply
);
679 input_uV
= rdev
->constraints
->input_uV
;
683 /* calc total requested load */
684 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
685 current_uA
+= sibling
->uA_load
;
687 /* now get the optimum mode for our new total regulator load */
688 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
689 output_uV
, current_uA
);
691 /* check the new mode is allowed */
692 err
= regulator_mode_constrain(rdev
, &mode
);
694 rdev
->desc
->ops
->set_mode(rdev
, mode
);
697 static int suspend_set_state(struct regulator_dev
*rdev
,
698 struct regulator_state
*rstate
)
702 /* If we have no suspend mode configration don't set anything;
703 * only warn if the driver implements set_suspend_voltage or
704 * set_suspend_mode callback.
706 if (!rstate
->enabled
&& !rstate
->disabled
) {
707 if (rdev
->desc
->ops
->set_suspend_voltage
||
708 rdev
->desc
->ops
->set_suspend_mode
)
709 rdev_warn(rdev
, "No configuration\n");
713 if (rstate
->enabled
&& rstate
->disabled
) {
714 rdev_err(rdev
, "invalid configuration\n");
718 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
719 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
720 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
721 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
722 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
726 rdev_err(rdev
, "failed to enabled/disable\n");
730 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
731 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
733 rdev_err(rdev
, "failed to set voltage\n");
738 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
739 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
741 rdev_err(rdev
, "failed to set mode\n");
748 /* locks held by caller */
749 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
751 if (!rdev
->constraints
)
755 case PM_SUSPEND_STANDBY
:
756 return suspend_set_state(rdev
,
757 &rdev
->constraints
->state_standby
);
759 return suspend_set_state(rdev
,
760 &rdev
->constraints
->state_mem
);
762 return suspend_set_state(rdev
,
763 &rdev
->constraints
->state_disk
);
769 static void print_constraints(struct regulator_dev
*rdev
)
771 struct regulation_constraints
*constraints
= rdev
->constraints
;
776 if (constraints
->min_uV
&& constraints
->max_uV
) {
777 if (constraints
->min_uV
== constraints
->max_uV
)
778 count
+= sprintf(buf
+ count
, "%d mV ",
779 constraints
->min_uV
/ 1000);
781 count
+= sprintf(buf
+ count
, "%d <--> %d mV ",
782 constraints
->min_uV
/ 1000,
783 constraints
->max_uV
/ 1000);
786 if (!constraints
->min_uV
||
787 constraints
->min_uV
!= constraints
->max_uV
) {
788 ret
= _regulator_get_voltage(rdev
);
790 count
+= sprintf(buf
+ count
, "at %d mV ", ret
/ 1000);
793 if (constraints
->uV_offset
)
794 count
+= sprintf(buf
, "%dmV offset ",
795 constraints
->uV_offset
/ 1000);
797 if (constraints
->min_uA
&& constraints
->max_uA
) {
798 if (constraints
->min_uA
== constraints
->max_uA
)
799 count
+= sprintf(buf
+ count
, "%d mA ",
800 constraints
->min_uA
/ 1000);
802 count
+= sprintf(buf
+ count
, "%d <--> %d mA ",
803 constraints
->min_uA
/ 1000,
804 constraints
->max_uA
/ 1000);
807 if (!constraints
->min_uA
||
808 constraints
->min_uA
!= constraints
->max_uA
) {
809 ret
= _regulator_get_current_limit(rdev
);
811 count
+= sprintf(buf
+ count
, "at %d mA ", ret
/ 1000);
814 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
815 count
+= sprintf(buf
+ count
, "fast ");
816 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
817 count
+= sprintf(buf
+ count
, "normal ");
818 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
819 count
+= sprintf(buf
+ count
, "idle ");
820 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
821 count
+= sprintf(buf
+ count
, "standby");
824 sprintf(buf
, "no parameters");
826 rdev_info(rdev
, "%s\n", buf
);
828 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
829 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
831 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
834 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
835 struct regulation_constraints
*constraints
)
837 struct regulator_ops
*ops
= rdev
->desc
->ops
;
840 /* do we need to apply the constraint voltage */
841 if (rdev
->constraints
->apply_uV
&&
842 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
843 ret
= _regulator_do_set_voltage(rdev
,
844 rdev
->constraints
->min_uV
,
845 rdev
->constraints
->max_uV
);
847 rdev_err(rdev
, "failed to apply %duV constraint\n",
848 rdev
->constraints
->min_uV
);
853 /* constrain machine-level voltage specs to fit
854 * the actual range supported by this regulator.
856 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
857 int count
= rdev
->desc
->n_voltages
;
859 int min_uV
= INT_MAX
;
860 int max_uV
= INT_MIN
;
861 int cmin
= constraints
->min_uV
;
862 int cmax
= constraints
->max_uV
;
864 /* it's safe to autoconfigure fixed-voltage supplies
865 and the constraints are used by list_voltage. */
866 if (count
== 1 && !cmin
) {
869 constraints
->min_uV
= cmin
;
870 constraints
->max_uV
= cmax
;
873 /* voltage constraints are optional */
874 if ((cmin
== 0) && (cmax
== 0))
877 /* else require explicit machine-level constraints */
878 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
879 rdev_err(rdev
, "invalid voltage constraints\n");
883 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
884 for (i
= 0; i
< count
; i
++) {
887 value
= ops
->list_voltage(rdev
, i
);
891 /* maybe adjust [min_uV..max_uV] */
892 if (value
>= cmin
&& value
< min_uV
)
894 if (value
<= cmax
&& value
> max_uV
)
898 /* final: [min_uV..max_uV] valid iff constraints valid */
899 if (max_uV
< min_uV
) {
901 "unsupportable voltage constraints %u-%uuV\n",
906 /* use regulator's subset of machine constraints */
907 if (constraints
->min_uV
< min_uV
) {
908 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
909 constraints
->min_uV
, min_uV
);
910 constraints
->min_uV
= min_uV
;
912 if (constraints
->max_uV
> max_uV
) {
913 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
914 constraints
->max_uV
, max_uV
);
915 constraints
->max_uV
= max_uV
;
923 * set_machine_constraints - sets regulator constraints
924 * @rdev: regulator source
925 * @constraints: constraints to apply
927 * Allows platform initialisation code to define and constrain
928 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
929 * Constraints *must* be set by platform code in order for some
930 * regulator operations to proceed i.e. set_voltage, set_current_limit,
933 static int set_machine_constraints(struct regulator_dev
*rdev
,
934 const struct regulation_constraints
*constraints
)
937 struct regulator_ops
*ops
= rdev
->desc
->ops
;
940 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
943 rdev
->constraints
= kzalloc(sizeof(*constraints
),
945 if (!rdev
->constraints
)
948 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
952 /* do we need to setup our suspend state */
953 if (rdev
->constraints
->initial_state
) {
954 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
956 rdev_err(rdev
, "failed to set suspend state\n");
961 if (rdev
->constraints
->initial_mode
) {
962 if (!ops
->set_mode
) {
963 rdev_err(rdev
, "no set_mode operation\n");
968 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
970 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
975 /* If the constraints say the regulator should be on at this point
976 * and we have control then make sure it is enabled.
978 if ((rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) &&
980 ret
= ops
->enable(rdev
);
982 rdev_err(rdev
, "failed to enable\n");
987 if (rdev
->constraints
->ramp_delay
&& ops
->set_ramp_delay
) {
988 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
990 rdev_err(rdev
, "failed to set ramp_delay\n");
995 print_constraints(rdev
);
998 kfree(rdev
->constraints
);
999 rdev
->constraints
= NULL
;
1004 * set_supply - set regulator supply regulator
1005 * @rdev: regulator name
1006 * @supply_rdev: supply regulator name
1008 * Called by platform initialisation code to set the supply regulator for this
1009 * regulator. This ensures that a regulators supply will also be enabled by the
1010 * core if it's child is enabled.
1012 static int set_supply(struct regulator_dev
*rdev
,
1013 struct regulator_dev
*supply_rdev
)
1017 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1019 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1020 if (rdev
->supply
== NULL
) {
1024 supply_rdev
->open_count
++;
1030 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1031 * @rdev: regulator source
1032 * @consumer_dev_name: dev_name() string for device supply applies to
1033 * @supply: symbolic name for supply
1035 * Allows platform initialisation code to map physical regulator
1036 * sources to symbolic names for supplies for use by devices. Devices
1037 * should use these symbolic names to request regulators, avoiding the
1038 * need to provide board-specific regulator names as platform data.
1040 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1041 const char *consumer_dev_name
,
1044 struct regulator_map
*node
;
1050 if (consumer_dev_name
!= NULL
)
1055 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1056 if (node
->dev_name
&& consumer_dev_name
) {
1057 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1059 } else if (node
->dev_name
|| consumer_dev_name
) {
1063 if (strcmp(node
->supply
, supply
) != 0)
1066 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1068 dev_name(&node
->regulator
->dev
),
1069 node
->regulator
->desc
->name
,
1071 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1075 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1079 node
->regulator
= rdev
;
1080 node
->supply
= supply
;
1083 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1084 if (node
->dev_name
== NULL
) {
1090 list_add(&node
->list
, ®ulator_map_list
);
1094 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1096 struct regulator_map
*node
, *n
;
1098 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1099 if (rdev
== node
->regulator
) {
1100 list_del(&node
->list
);
1101 kfree(node
->dev_name
);
1107 #define REG_STR_SIZE 64
1109 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1111 const char *supply_name
)
1113 struct regulator
*regulator
;
1114 char buf
[REG_STR_SIZE
];
1117 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1118 if (regulator
== NULL
)
1121 mutex_lock(&rdev
->mutex
);
1122 regulator
->rdev
= rdev
;
1123 list_add(®ulator
->list
, &rdev
->consumer_list
);
1126 regulator
->dev
= dev
;
1128 /* Add a link to the device sysfs entry */
1129 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1130 dev
->kobj
.name
, supply_name
);
1131 if (size
>= REG_STR_SIZE
)
1134 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1135 if (regulator
->supply_name
== NULL
)
1138 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1141 rdev_warn(rdev
, "could not add device link %s err %d\n",
1142 dev
->kobj
.name
, err
);
1146 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1147 if (regulator
->supply_name
== NULL
)
1151 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1153 if (!regulator
->debugfs
) {
1154 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1156 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1157 ®ulator
->uA_load
);
1158 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1159 ®ulator
->min_uV
);
1160 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1161 ®ulator
->max_uV
);
1165 * Check now if the regulator is an always on regulator - if
1166 * it is then we don't need to do nearly so much work for
1167 * enable/disable calls.
1169 if (!_regulator_can_change_status(rdev
) &&
1170 _regulator_is_enabled(rdev
))
1171 regulator
->always_on
= true;
1173 mutex_unlock(&rdev
->mutex
);
1176 list_del(®ulator
->list
);
1178 mutex_unlock(&rdev
->mutex
);
1182 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1184 if (!rdev
->desc
->ops
->enable_time
)
1185 return rdev
->desc
->enable_time
;
1186 return rdev
->desc
->ops
->enable_time(rdev
);
1189 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1193 struct regulator_dev
*r
;
1194 struct device_node
*node
;
1195 struct regulator_map
*map
;
1196 const char *devname
= NULL
;
1198 /* first do a dt based lookup */
1199 if (dev
&& dev
->of_node
) {
1200 node
= of_get_regulator(dev
, supply
);
1202 list_for_each_entry(r
, ®ulator_list
, list
)
1203 if (r
->dev
.parent
&&
1204 node
== r
->dev
.of_node
)
1208 * If we couldn't even get the node then it's
1209 * not just that the device didn't register
1210 * yet, there's no node and we'll never
1217 /* if not found, try doing it non-dt way */
1219 devname
= dev_name(dev
);
1221 list_for_each_entry(r
, ®ulator_list
, list
)
1222 if (strcmp(rdev_get_name(r
), supply
) == 0)
1225 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1226 /* If the mapping has a device set up it must match */
1227 if (map
->dev_name
&&
1228 (!devname
|| strcmp(map
->dev_name
, devname
)))
1231 if (strcmp(map
->supply
, supply
) == 0)
1232 return map
->regulator
;
1239 /* Internal regulator request function */
1240 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1243 struct regulator_dev
*rdev
;
1244 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1245 const char *devname
= NULL
;
1249 pr_err("get() with no identifier\n");
1254 devname
= dev_name(dev
);
1256 mutex_lock(®ulator_list_mutex
);
1258 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1263 * If we have return value from dev_lookup fail, we do not expect to
1264 * succeed, so, quit with appropriate error value
1267 regulator
= ERR_PTR(ret
);
1271 if (board_wants_dummy_regulator
) {
1272 rdev
= dummy_regulator_rdev
;
1276 #ifdef CONFIG_REGULATOR_DUMMY
1278 devname
= "deviceless";
1280 /* If the board didn't flag that it was fully constrained then
1281 * substitute in a dummy regulator so consumers can continue.
1283 if (!has_full_constraints
) {
1284 pr_warn("%s supply %s not found, using dummy regulator\n",
1286 rdev
= dummy_regulator_rdev
;
1291 mutex_unlock(®ulator_list_mutex
);
1295 if (rdev
->exclusive
) {
1296 regulator
= ERR_PTR(-EPERM
);
1300 if (exclusive
&& rdev
->open_count
) {
1301 regulator
= ERR_PTR(-EBUSY
);
1305 if (!try_module_get(rdev
->owner
))
1308 regulator
= create_regulator(rdev
, dev
, id
);
1309 if (regulator
== NULL
) {
1310 regulator
= ERR_PTR(-ENOMEM
);
1311 module_put(rdev
->owner
);
1317 rdev
->exclusive
= 1;
1319 ret
= _regulator_is_enabled(rdev
);
1321 rdev
->use_count
= 1;
1323 rdev
->use_count
= 0;
1327 mutex_unlock(®ulator_list_mutex
);
1333 * regulator_get - lookup and obtain a reference to a regulator.
1334 * @dev: device for regulator "consumer"
1335 * @id: Supply name or regulator ID.
1337 * Returns a struct regulator corresponding to the regulator producer,
1338 * or IS_ERR() condition containing errno.
1340 * Use of supply names configured via regulator_set_device_supply() is
1341 * strongly encouraged. It is recommended that the supply name used
1342 * should match the name used for the supply and/or the relevant
1343 * device pins in the datasheet.
1345 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1347 return _regulator_get(dev
, id
, 0);
1349 EXPORT_SYMBOL_GPL(regulator_get
);
1351 static void devm_regulator_release(struct device
*dev
, void *res
)
1353 regulator_put(*(struct regulator
**)res
);
1357 * devm_regulator_get - Resource managed regulator_get()
1358 * @dev: device for regulator "consumer"
1359 * @id: Supply name or regulator ID.
1361 * Managed regulator_get(). Regulators returned from this function are
1362 * automatically regulator_put() on driver detach. See regulator_get() for more
1365 struct regulator
*devm_regulator_get(struct device
*dev
, const char *id
)
1367 struct regulator
**ptr
, *regulator
;
1369 ptr
= devres_alloc(devm_regulator_release
, sizeof(*ptr
), GFP_KERNEL
);
1371 return ERR_PTR(-ENOMEM
);
1373 regulator
= regulator_get(dev
, id
);
1374 if (!IS_ERR(regulator
)) {
1376 devres_add(dev
, ptr
);
1383 EXPORT_SYMBOL_GPL(devm_regulator_get
);
1386 * regulator_get_exclusive - obtain exclusive access to a regulator.
1387 * @dev: device for regulator "consumer"
1388 * @id: Supply name or regulator ID.
1390 * Returns a struct regulator corresponding to the regulator producer,
1391 * or IS_ERR() condition containing errno. Other consumers will be
1392 * unable to obtain this reference is held and the use count for the
1393 * regulator will be initialised to reflect the current state of the
1396 * This is intended for use by consumers which cannot tolerate shared
1397 * use of the regulator such as those which need to force the
1398 * regulator off for correct operation of the hardware they are
1401 * Use of supply names configured via regulator_set_device_supply() is
1402 * strongly encouraged. It is recommended that the supply name used
1403 * should match the name used for the supply and/or the relevant
1404 * device pins in the datasheet.
1406 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1408 return _regulator_get(dev
, id
, 1);
1410 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1412 /* Locks held by regulator_put() */
1413 static void _regulator_put(struct regulator
*regulator
)
1415 struct regulator_dev
*rdev
;
1417 if (regulator
== NULL
|| IS_ERR(regulator
))
1420 rdev
= regulator
->rdev
;
1422 debugfs_remove_recursive(regulator
->debugfs
);
1424 /* remove any sysfs entries */
1426 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1427 kfree(regulator
->supply_name
);
1428 list_del(®ulator
->list
);
1432 rdev
->exclusive
= 0;
1434 module_put(rdev
->owner
);
1438 * regulator_put - "free" the regulator source
1439 * @regulator: regulator source
1441 * Note: drivers must ensure that all regulator_enable calls made on this
1442 * regulator source are balanced by regulator_disable calls prior to calling
1445 void regulator_put(struct regulator
*regulator
)
1447 mutex_lock(®ulator_list_mutex
);
1448 _regulator_put(regulator
);
1449 mutex_unlock(®ulator_list_mutex
);
1451 EXPORT_SYMBOL_GPL(regulator_put
);
1453 static int devm_regulator_match(struct device
*dev
, void *res
, void *data
)
1455 struct regulator
**r
= res
;
1464 * devm_regulator_put - Resource managed regulator_put()
1465 * @regulator: regulator to free
1467 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1468 * this function will not need to be called and the resource management
1469 * code will ensure that the resource is freed.
1471 void devm_regulator_put(struct regulator
*regulator
)
1475 rc
= devres_release(regulator
->dev
, devm_regulator_release
,
1476 devm_regulator_match
, regulator
);
1480 EXPORT_SYMBOL_GPL(devm_regulator_put
);
1482 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1483 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1484 const struct regulator_config
*config
)
1486 struct regulator_enable_gpio
*pin
;
1489 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1490 if (pin
->gpio
== config
->ena_gpio
) {
1491 rdev_dbg(rdev
, "GPIO %d is already used\n",
1493 goto update_ena_gpio_to_rdev
;
1497 ret
= gpio_request_one(config
->ena_gpio
,
1498 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1499 rdev_get_name(rdev
));
1503 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1505 gpio_free(config
->ena_gpio
);
1509 pin
->gpio
= config
->ena_gpio
;
1510 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1511 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1513 update_ena_gpio_to_rdev
:
1514 pin
->request_count
++;
1515 rdev
->ena_pin
= pin
;
1519 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1521 struct regulator_enable_gpio
*pin
, *n
;
1526 /* Free the GPIO only in case of no use */
1527 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1528 if (pin
->gpio
== rdev
->ena_pin
->gpio
) {
1529 if (pin
->request_count
<= 1) {
1530 pin
->request_count
= 0;
1531 gpio_free(pin
->gpio
);
1532 list_del(&pin
->list
);
1535 pin
->request_count
--;
1542 * Balance enable_count of each GPIO and actual GPIO pin control.
1543 * GPIO is enabled in case of initial use. (enable_count is 0)
1544 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1546 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1548 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1554 /* Enable GPIO at initial use */
1555 if (pin
->enable_count
== 0)
1556 gpio_set_value_cansleep(pin
->gpio
,
1557 !pin
->ena_gpio_invert
);
1559 pin
->enable_count
++;
1561 if (pin
->enable_count
> 1) {
1562 pin
->enable_count
--;
1566 /* Disable GPIO if not used */
1567 if (pin
->enable_count
<= 1) {
1568 gpio_set_value_cansleep(pin
->gpio
,
1569 pin
->ena_gpio_invert
);
1570 pin
->enable_count
= 0;
1577 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1581 /* Query before enabling in case configuration dependent. */
1582 ret
= _regulator_get_enable_time(rdev
);
1586 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1590 trace_regulator_enable(rdev_get_name(rdev
));
1592 if (rdev
->ena_pin
) {
1593 ret
= regulator_ena_gpio_ctrl(rdev
, true);
1596 rdev
->ena_gpio_state
= 1;
1597 } else if (rdev
->desc
->ops
->enable
) {
1598 ret
= rdev
->desc
->ops
->enable(rdev
);
1605 /* Allow the regulator to ramp; it would be useful to extend
1606 * this for bulk operations so that the regulators can ramp
1608 trace_regulator_enable_delay(rdev_get_name(rdev
));
1610 if (delay
>= 1000) {
1611 mdelay(delay
/ 1000);
1612 udelay(delay
% 1000);
1617 trace_regulator_enable_complete(rdev_get_name(rdev
));
1622 /* locks held by regulator_enable() */
1623 static int _regulator_enable(struct regulator_dev
*rdev
)
1627 /* check voltage and requested load before enabling */
1628 if (rdev
->constraints
&&
1629 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1630 drms_uA_update(rdev
);
1632 if (rdev
->use_count
== 0) {
1633 /* The regulator may on if it's not switchable or left on */
1634 ret
= _regulator_is_enabled(rdev
);
1635 if (ret
== -EINVAL
|| ret
== 0) {
1636 if (!_regulator_can_change_status(rdev
))
1639 ret
= _regulator_do_enable(rdev
);
1643 } else if (ret
< 0) {
1644 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1647 /* Fallthrough on positive return values - already enabled */
1656 * regulator_enable - enable regulator output
1657 * @regulator: regulator source
1659 * Request that the regulator be enabled with the regulator output at
1660 * the predefined voltage or current value. Calls to regulator_enable()
1661 * must be balanced with calls to regulator_disable().
1663 * NOTE: the output value can be set by other drivers, boot loader or may be
1664 * hardwired in the regulator.
1666 int regulator_enable(struct regulator
*regulator
)
1668 struct regulator_dev
*rdev
= regulator
->rdev
;
1671 if (regulator
->always_on
)
1675 ret
= regulator_enable(rdev
->supply
);
1680 mutex_lock(&rdev
->mutex
);
1681 ret
= _regulator_enable(rdev
);
1682 mutex_unlock(&rdev
->mutex
);
1684 if (ret
!= 0 && rdev
->supply
)
1685 regulator_disable(rdev
->supply
);
1689 EXPORT_SYMBOL_GPL(regulator_enable
);
1691 static int _regulator_do_disable(struct regulator_dev
*rdev
)
1695 trace_regulator_disable(rdev_get_name(rdev
));
1697 if (rdev
->ena_pin
) {
1698 ret
= regulator_ena_gpio_ctrl(rdev
, false);
1701 rdev
->ena_gpio_state
= 0;
1703 } else if (rdev
->desc
->ops
->disable
) {
1704 ret
= rdev
->desc
->ops
->disable(rdev
);
1709 trace_regulator_disable_complete(rdev_get_name(rdev
));
1711 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1716 /* locks held by regulator_disable() */
1717 static int _regulator_disable(struct regulator_dev
*rdev
)
1721 if (WARN(rdev
->use_count
<= 0,
1722 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1725 /* are we the last user and permitted to disable ? */
1726 if (rdev
->use_count
== 1 &&
1727 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1729 /* we are last user */
1730 if (_regulator_can_change_status(rdev
)) {
1731 ret
= _regulator_do_disable(rdev
);
1733 rdev_err(rdev
, "failed to disable\n");
1738 rdev
->use_count
= 0;
1739 } else if (rdev
->use_count
> 1) {
1741 if (rdev
->constraints
&&
1742 (rdev
->constraints
->valid_ops_mask
&
1743 REGULATOR_CHANGE_DRMS
))
1744 drms_uA_update(rdev
);
1753 * regulator_disable - disable regulator output
1754 * @regulator: regulator source
1756 * Disable the regulator output voltage or current. Calls to
1757 * regulator_enable() must be balanced with calls to
1758 * regulator_disable().
1760 * NOTE: this will only disable the regulator output if no other consumer
1761 * devices have it enabled, the regulator device supports disabling and
1762 * machine constraints permit this operation.
1764 int regulator_disable(struct regulator
*regulator
)
1766 struct regulator_dev
*rdev
= regulator
->rdev
;
1769 if (regulator
->always_on
)
1772 mutex_lock(&rdev
->mutex
);
1773 ret
= _regulator_disable(rdev
);
1774 mutex_unlock(&rdev
->mutex
);
1776 if (ret
== 0 && rdev
->supply
)
1777 regulator_disable(rdev
->supply
);
1781 EXPORT_SYMBOL_GPL(regulator_disable
);
1783 /* locks held by regulator_force_disable() */
1784 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1789 if (rdev
->desc
->ops
->disable
) {
1790 /* ah well, who wants to live forever... */
1791 ret
= rdev
->desc
->ops
->disable(rdev
);
1793 rdev_err(rdev
, "failed to force disable\n");
1796 /* notify other consumers that power has been forced off */
1797 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1798 REGULATOR_EVENT_DISABLE
, NULL
);
1805 * regulator_force_disable - force disable regulator output
1806 * @regulator: regulator source
1808 * Forcibly disable the regulator output voltage or current.
1809 * NOTE: this *will* disable the regulator output even if other consumer
1810 * devices have it enabled. This should be used for situations when device
1811 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1813 int regulator_force_disable(struct regulator
*regulator
)
1815 struct regulator_dev
*rdev
= regulator
->rdev
;
1818 mutex_lock(&rdev
->mutex
);
1819 regulator
->uA_load
= 0;
1820 ret
= _regulator_force_disable(regulator
->rdev
);
1821 mutex_unlock(&rdev
->mutex
);
1824 while (rdev
->open_count
--)
1825 regulator_disable(rdev
->supply
);
1829 EXPORT_SYMBOL_GPL(regulator_force_disable
);
1831 static void regulator_disable_work(struct work_struct
*work
)
1833 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
1837 mutex_lock(&rdev
->mutex
);
1839 BUG_ON(!rdev
->deferred_disables
);
1841 count
= rdev
->deferred_disables
;
1842 rdev
->deferred_disables
= 0;
1844 for (i
= 0; i
< count
; i
++) {
1845 ret
= _regulator_disable(rdev
);
1847 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
1850 mutex_unlock(&rdev
->mutex
);
1853 for (i
= 0; i
< count
; i
++) {
1854 ret
= regulator_disable(rdev
->supply
);
1857 "Supply disable failed: %d\n", ret
);
1864 * regulator_disable_deferred - disable regulator output with delay
1865 * @regulator: regulator source
1866 * @ms: miliseconds until the regulator is disabled
1868 * Execute regulator_disable() on the regulator after a delay. This
1869 * is intended for use with devices that require some time to quiesce.
1871 * NOTE: this will only disable the regulator output if no other consumer
1872 * devices have it enabled, the regulator device supports disabling and
1873 * machine constraints permit this operation.
1875 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
1877 struct regulator_dev
*rdev
= regulator
->rdev
;
1880 if (regulator
->always_on
)
1884 return regulator_disable(regulator
);
1886 mutex_lock(&rdev
->mutex
);
1887 rdev
->deferred_disables
++;
1888 mutex_unlock(&rdev
->mutex
);
1890 ret
= schedule_delayed_work(&rdev
->disable_work
,
1891 msecs_to_jiffies(ms
));
1897 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
1900 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1902 * @rdev: regulator to operate on
1904 * Regulators that use regmap for their register I/O can set the
1905 * enable_reg and enable_mask fields in their descriptor and then use
1906 * this as their is_enabled operation, saving some code.
1908 int regulator_is_enabled_regmap(struct regulator_dev
*rdev
)
1913 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->enable_reg
, &val
);
1917 if (rdev
->desc
->enable_is_inverted
)
1918 return (val
& rdev
->desc
->enable_mask
) == 0;
1920 return (val
& rdev
->desc
->enable_mask
) != 0;
1922 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap
);
1925 * regulator_enable_regmap - standard enable() for regmap users
1927 * @rdev: regulator to operate on
1929 * Regulators that use regmap for their register I/O can set the
1930 * enable_reg and enable_mask fields in their descriptor and then use
1931 * this as their enable() operation, saving some code.
1933 int regulator_enable_regmap(struct regulator_dev
*rdev
)
1937 if (rdev
->desc
->enable_is_inverted
)
1940 val
= rdev
->desc
->enable_mask
;
1942 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1943 rdev
->desc
->enable_mask
, val
);
1945 EXPORT_SYMBOL_GPL(regulator_enable_regmap
);
1948 * regulator_disable_regmap - standard disable() for regmap users
1950 * @rdev: regulator to operate on
1952 * Regulators that use regmap for their register I/O can set the
1953 * enable_reg and enable_mask fields in their descriptor and then use
1954 * this as their disable() operation, saving some code.
1956 int regulator_disable_regmap(struct regulator_dev
*rdev
)
1960 if (rdev
->desc
->enable_is_inverted
)
1961 val
= rdev
->desc
->enable_mask
;
1965 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1966 rdev
->desc
->enable_mask
, val
);
1968 EXPORT_SYMBOL_GPL(regulator_disable_regmap
);
1970 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
1972 /* A GPIO control always takes precedence */
1974 return rdev
->ena_gpio_state
;
1976 /* If we don't know then assume that the regulator is always on */
1977 if (!rdev
->desc
->ops
->is_enabled
)
1980 return rdev
->desc
->ops
->is_enabled(rdev
);
1984 * regulator_is_enabled - is the regulator output enabled
1985 * @regulator: regulator source
1987 * Returns positive if the regulator driver backing the source/client
1988 * has requested that the device be enabled, zero if it hasn't, else a
1989 * negative errno code.
1991 * Note that the device backing this regulator handle can have multiple
1992 * users, so it might be enabled even if regulator_enable() was never
1993 * called for this particular source.
1995 int regulator_is_enabled(struct regulator
*regulator
)
1999 if (regulator
->always_on
)
2002 mutex_lock(®ulator
->rdev
->mutex
);
2003 ret
= _regulator_is_enabled(regulator
->rdev
);
2004 mutex_unlock(®ulator
->rdev
->mutex
);
2008 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2011 * regulator_can_change_voltage - check if regulator can change voltage
2012 * @regulator: regulator source
2014 * Returns positive if the regulator driver backing the source/client
2015 * can change its voltage, false otherwise. Usefull for detecting fixed
2016 * or dummy regulators and disabling voltage change logic in the client
2019 int regulator_can_change_voltage(struct regulator
*regulator
)
2021 struct regulator_dev
*rdev
= regulator
->rdev
;
2023 if (rdev
->constraints
&&
2024 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2025 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2028 if (rdev
->desc
->continuous_voltage_range
&&
2029 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2030 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2036 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2039 * regulator_count_voltages - count regulator_list_voltage() selectors
2040 * @regulator: regulator source
2042 * Returns number of selectors, or negative errno. Selectors are
2043 * numbered starting at zero, and typically correspond to bitfields
2044 * in hardware registers.
2046 int regulator_count_voltages(struct regulator
*regulator
)
2048 struct regulator_dev
*rdev
= regulator
->rdev
;
2050 return rdev
->desc
->n_voltages
? : -EINVAL
;
2052 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2055 * regulator_list_voltage_linear - List voltages with simple calculation
2057 * @rdev: Regulator device
2058 * @selector: Selector to convert into a voltage
2060 * Regulators with a simple linear mapping between voltages and
2061 * selectors can set min_uV and uV_step in the regulator descriptor
2062 * and then use this function as their list_voltage() operation,
2064 int regulator_list_voltage_linear(struct regulator_dev
*rdev
,
2065 unsigned int selector
)
2067 if (selector
>= rdev
->desc
->n_voltages
)
2069 if (selector
< rdev
->desc
->linear_min_sel
)
2072 selector
-= rdev
->desc
->linear_min_sel
;
2074 return rdev
->desc
->min_uV
+ (rdev
->desc
->uV_step
* selector
);
2076 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear
);
2079 * regulator_list_voltage_table - List voltages with table based mapping
2081 * @rdev: Regulator device
2082 * @selector: Selector to convert into a voltage
2084 * Regulators with table based mapping between voltages and
2085 * selectors can set volt_table in the regulator descriptor
2086 * and then use this function as their list_voltage() operation.
2088 int regulator_list_voltage_table(struct regulator_dev
*rdev
,
2089 unsigned int selector
)
2091 if (!rdev
->desc
->volt_table
) {
2092 BUG_ON(!rdev
->desc
->volt_table
);
2096 if (selector
>= rdev
->desc
->n_voltages
)
2099 return rdev
->desc
->volt_table
[selector
];
2101 EXPORT_SYMBOL_GPL(regulator_list_voltage_table
);
2104 * regulator_list_voltage - enumerate supported voltages
2105 * @regulator: regulator source
2106 * @selector: identify voltage to list
2107 * Context: can sleep
2109 * Returns a voltage that can be passed to @regulator_set_voltage(),
2110 * zero if this selector code can't be used on this system, or a
2113 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2115 struct regulator_dev
*rdev
= regulator
->rdev
;
2116 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2119 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
2122 mutex_lock(&rdev
->mutex
);
2123 ret
= ops
->list_voltage(rdev
, selector
);
2124 mutex_unlock(&rdev
->mutex
);
2127 if (ret
< rdev
->constraints
->min_uV
)
2129 else if (ret
> rdev
->constraints
->max_uV
)
2135 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2138 * regulator_is_supported_voltage - check if a voltage range can be supported
2140 * @regulator: Regulator to check.
2141 * @min_uV: Minimum required voltage in uV.
2142 * @max_uV: Maximum required voltage in uV.
2144 * Returns a boolean or a negative error code.
2146 int regulator_is_supported_voltage(struct regulator
*regulator
,
2147 int min_uV
, int max_uV
)
2149 struct regulator_dev
*rdev
= regulator
->rdev
;
2150 int i
, voltages
, ret
;
2152 /* If we can't change voltage check the current voltage */
2153 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2154 ret
= regulator_get_voltage(regulator
);
2156 return (min_uV
<= ret
&& ret
<= max_uV
);
2161 /* Any voltage within constrains range is fine? */
2162 if (rdev
->desc
->continuous_voltage_range
)
2163 return min_uV
>= rdev
->constraints
->min_uV
&&
2164 max_uV
<= rdev
->constraints
->max_uV
;
2166 ret
= regulator_count_voltages(regulator
);
2171 for (i
= 0; i
< voltages
; i
++) {
2172 ret
= regulator_list_voltage(regulator
, i
);
2174 if (ret
>= min_uV
&& ret
<= max_uV
)
2180 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2183 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2185 * @rdev: regulator to operate on
2187 * Regulators that use regmap for their register I/O can set the
2188 * vsel_reg and vsel_mask fields in their descriptor and then use this
2189 * as their get_voltage_vsel operation, saving some code.
2191 int regulator_get_voltage_sel_regmap(struct regulator_dev
*rdev
)
2196 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->vsel_reg
, &val
);
2200 val
&= rdev
->desc
->vsel_mask
;
2201 val
>>= ffs(rdev
->desc
->vsel_mask
) - 1;
2205 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap
);
2208 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2210 * @rdev: regulator to operate on
2211 * @sel: Selector to set
2213 * Regulators that use regmap for their register I/O can set the
2214 * vsel_reg and vsel_mask fields in their descriptor and then use this
2215 * as their set_voltage_vsel operation, saving some code.
2217 int regulator_set_voltage_sel_regmap(struct regulator_dev
*rdev
, unsigned sel
)
2221 sel
<<= ffs(rdev
->desc
->vsel_mask
) - 1;
2223 ret
= regmap_update_bits(rdev
->regmap
, rdev
->desc
->vsel_reg
,
2224 rdev
->desc
->vsel_mask
, sel
);
2228 if (rdev
->desc
->apply_bit
)
2229 ret
= regmap_update_bits(rdev
->regmap
, rdev
->desc
->apply_reg
,
2230 rdev
->desc
->apply_bit
,
2231 rdev
->desc
->apply_bit
);
2234 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap
);
2237 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2239 * @rdev: Regulator to operate on
2240 * @min_uV: Lower bound for voltage
2241 * @max_uV: Upper bound for voltage
2243 * Drivers implementing set_voltage_sel() and list_voltage() can use
2244 * this as their map_voltage() operation. It will find a suitable
2245 * voltage by calling list_voltage() until it gets something in bounds
2246 * for the requested voltages.
2248 int regulator_map_voltage_iterate(struct regulator_dev
*rdev
,
2249 int min_uV
, int max_uV
)
2251 int best_val
= INT_MAX
;
2255 /* Find the smallest voltage that falls within the specified
2258 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2259 ret
= rdev
->desc
->ops
->list_voltage(rdev
, i
);
2263 if (ret
< best_val
&& ret
>= min_uV
&& ret
<= max_uV
) {
2269 if (best_val
!= INT_MAX
)
2274 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate
);
2277 * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
2279 * @rdev: Regulator to operate on
2280 * @min_uV: Lower bound for voltage
2281 * @max_uV: Upper bound for voltage
2283 * Drivers that have ascendant voltage list can use this as their
2284 * map_voltage() operation.
2286 int regulator_map_voltage_ascend(struct regulator_dev
*rdev
,
2287 int min_uV
, int max_uV
)
2291 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2292 ret
= rdev
->desc
->ops
->list_voltage(rdev
, i
);
2299 if (ret
>= min_uV
&& ret
<= max_uV
)
2305 EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend
);
2308 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2310 * @rdev: Regulator to operate on
2311 * @min_uV: Lower bound for voltage
2312 * @max_uV: Upper bound for voltage
2314 * Drivers providing min_uV and uV_step in their regulator_desc can
2315 * use this as their map_voltage() operation.
2317 int regulator_map_voltage_linear(struct regulator_dev
*rdev
,
2318 int min_uV
, int max_uV
)
2322 /* Allow uV_step to be 0 for fixed voltage */
2323 if (rdev
->desc
->n_voltages
== 1 && rdev
->desc
->uV_step
== 0) {
2324 if (min_uV
<= rdev
->desc
->min_uV
&& rdev
->desc
->min_uV
<= max_uV
)
2330 if (!rdev
->desc
->uV_step
) {
2331 BUG_ON(!rdev
->desc
->uV_step
);
2335 if (min_uV
< rdev
->desc
->min_uV
)
2336 min_uV
= rdev
->desc
->min_uV
;
2338 ret
= DIV_ROUND_UP(min_uV
- rdev
->desc
->min_uV
, rdev
->desc
->uV_step
);
2342 ret
+= rdev
->desc
->linear_min_sel
;
2344 /* Map back into a voltage to verify we're still in bounds */
2345 voltage
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2346 if (voltage
< min_uV
|| voltage
> max_uV
)
2351 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear
);
2353 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2354 int min_uV
, int max_uV
)
2359 unsigned int selector
;
2360 int old_selector
= -1;
2362 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2364 min_uV
+= rdev
->constraints
->uV_offset
;
2365 max_uV
+= rdev
->constraints
->uV_offset
;
2368 * If we can't obtain the old selector there is not enough
2369 * info to call set_voltage_time_sel().
2371 if (_regulator_is_enabled(rdev
) &&
2372 rdev
->desc
->ops
->set_voltage_time_sel
&&
2373 rdev
->desc
->ops
->get_voltage_sel
) {
2374 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2375 if (old_selector
< 0)
2376 return old_selector
;
2379 if (rdev
->desc
->ops
->set_voltage
) {
2380 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
,
2384 if (rdev
->desc
->ops
->list_voltage
)
2385 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2388 best_val
= _regulator_get_voltage(rdev
);
2391 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2392 if (rdev
->desc
->ops
->map_voltage
) {
2393 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2396 if (rdev
->desc
->ops
->list_voltage
==
2397 regulator_list_voltage_linear
)
2398 ret
= regulator_map_voltage_linear(rdev
,
2401 ret
= regulator_map_voltage_iterate(rdev
,
2406 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2407 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2409 if (old_selector
== selector
)
2412 ret
= rdev
->desc
->ops
->set_voltage_sel(
2422 /* Call set_voltage_time_sel if successfully obtained old_selector */
2423 if (ret
== 0 && _regulator_is_enabled(rdev
) && old_selector
>= 0 &&
2424 old_selector
!= selector
&& rdev
->desc
->ops
->set_voltage_time_sel
) {
2426 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2427 old_selector
, selector
);
2429 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2434 /* Insert any necessary delays */
2435 if (delay
>= 1000) {
2436 mdelay(delay
/ 1000);
2437 udelay(delay
% 1000);
2443 if (ret
== 0 && best_val
>= 0) {
2444 unsigned long data
= best_val
;
2446 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2450 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2456 * regulator_set_voltage - set regulator output voltage
2457 * @regulator: regulator source
2458 * @min_uV: Minimum required voltage in uV
2459 * @max_uV: Maximum acceptable voltage in uV
2461 * Sets a voltage regulator to the desired output voltage. This can be set
2462 * during any regulator state. IOW, regulator can be disabled or enabled.
2464 * If the regulator is enabled then the voltage will change to the new value
2465 * immediately otherwise if the regulator is disabled the regulator will
2466 * output at the new voltage when enabled.
2468 * NOTE: If the regulator is shared between several devices then the lowest
2469 * request voltage that meets the system constraints will be used.
2470 * Regulator system constraints must be set for this regulator before
2471 * calling this function otherwise this call will fail.
2473 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2475 struct regulator_dev
*rdev
= regulator
->rdev
;
2477 int old_min_uV
, old_max_uV
;
2479 mutex_lock(&rdev
->mutex
);
2481 /* If we're setting the same range as last time the change
2482 * should be a noop (some cpufreq implementations use the same
2483 * voltage for multiple frequencies, for example).
2485 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2489 if (!rdev
->desc
->ops
->set_voltage
&&
2490 !rdev
->desc
->ops
->set_voltage_sel
) {
2495 /* constraints check */
2496 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2500 /* restore original values in case of error */
2501 old_min_uV
= regulator
->min_uV
;
2502 old_max_uV
= regulator
->max_uV
;
2503 regulator
->min_uV
= min_uV
;
2504 regulator
->max_uV
= max_uV
;
2506 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2510 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2515 mutex_unlock(&rdev
->mutex
);
2518 regulator
->min_uV
= old_min_uV
;
2519 regulator
->max_uV
= old_max_uV
;
2520 mutex_unlock(&rdev
->mutex
);
2523 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2526 * regulator_set_voltage_time - get raise/fall time
2527 * @regulator: regulator source
2528 * @old_uV: starting voltage in microvolts
2529 * @new_uV: target voltage in microvolts
2531 * Provided with the starting and ending voltage, this function attempts to
2532 * calculate the time in microseconds required to rise or fall to this new
2535 int regulator_set_voltage_time(struct regulator
*regulator
,
2536 int old_uV
, int new_uV
)
2538 struct regulator_dev
*rdev
= regulator
->rdev
;
2539 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2545 /* Currently requires operations to do this */
2546 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2547 || !rdev
->desc
->n_voltages
)
2550 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2551 /* We only look for exact voltage matches here */
2552 voltage
= regulator_list_voltage(regulator
, i
);
2557 if (voltage
== old_uV
)
2559 if (voltage
== new_uV
)
2563 if (old_sel
< 0 || new_sel
< 0)
2566 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2568 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2571 * regulator_set_voltage_time_sel - get raise/fall time
2572 * @rdev: regulator source device
2573 * @old_selector: selector for starting voltage
2574 * @new_selector: selector for target voltage
2576 * Provided with the starting and target voltage selectors, this function
2577 * returns time in microseconds required to rise or fall to this new voltage
2579 * Drivers providing ramp_delay in regulation_constraints can use this as their
2580 * set_voltage_time_sel() operation.
2582 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2583 unsigned int old_selector
,
2584 unsigned int new_selector
)
2586 unsigned int ramp_delay
= 0;
2587 int old_volt
, new_volt
;
2589 if (rdev
->constraints
->ramp_delay
)
2590 ramp_delay
= rdev
->constraints
->ramp_delay
;
2591 else if (rdev
->desc
->ramp_delay
)
2592 ramp_delay
= rdev
->desc
->ramp_delay
;
2594 if (ramp_delay
== 0) {
2595 rdev_warn(rdev
, "ramp_delay not set\n");
2600 if (!rdev
->desc
->ops
->list_voltage
)
2603 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2604 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2606 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2608 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2611 * regulator_sync_voltage - re-apply last regulator output voltage
2612 * @regulator: regulator source
2614 * Re-apply the last configured voltage. This is intended to be used
2615 * where some external control source the consumer is cooperating with
2616 * has caused the configured voltage to change.
2618 int regulator_sync_voltage(struct regulator
*regulator
)
2620 struct regulator_dev
*rdev
= regulator
->rdev
;
2621 int ret
, min_uV
, max_uV
;
2623 mutex_lock(&rdev
->mutex
);
2625 if (!rdev
->desc
->ops
->set_voltage
&&
2626 !rdev
->desc
->ops
->set_voltage_sel
) {
2631 /* This is only going to work if we've had a voltage configured. */
2632 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2637 min_uV
= regulator
->min_uV
;
2638 max_uV
= regulator
->max_uV
;
2640 /* This should be a paranoia check... */
2641 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2645 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2649 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2652 mutex_unlock(&rdev
->mutex
);
2655 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2657 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2661 if (rdev
->desc
->ops
->get_voltage_sel
) {
2662 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2665 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2666 } else if (rdev
->desc
->ops
->get_voltage
) {
2667 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2668 } else if (rdev
->desc
->ops
->list_voltage
) {
2669 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2676 return ret
- rdev
->constraints
->uV_offset
;
2680 * regulator_get_voltage - get regulator output voltage
2681 * @regulator: regulator source
2683 * This returns the current regulator voltage in uV.
2685 * NOTE: If the regulator is disabled it will return the voltage value. This
2686 * function should not be used to determine regulator state.
2688 int regulator_get_voltage(struct regulator
*regulator
)
2692 mutex_lock(®ulator
->rdev
->mutex
);
2694 ret
= _regulator_get_voltage(regulator
->rdev
);
2696 mutex_unlock(®ulator
->rdev
->mutex
);
2700 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2703 * regulator_set_current_limit - set regulator output current limit
2704 * @regulator: regulator source
2705 * @min_uA: Minimuum supported current in uA
2706 * @max_uA: Maximum supported current in uA
2708 * Sets current sink to the desired output current. This can be set during
2709 * any regulator state. IOW, regulator can be disabled or enabled.
2711 * If the regulator is enabled then the current will change to the new value
2712 * immediately otherwise if the regulator is disabled the regulator will
2713 * output at the new current when enabled.
2715 * NOTE: Regulator system constraints must be set for this regulator before
2716 * calling this function otherwise this call will fail.
2718 int regulator_set_current_limit(struct regulator
*regulator
,
2719 int min_uA
, int max_uA
)
2721 struct regulator_dev
*rdev
= regulator
->rdev
;
2724 mutex_lock(&rdev
->mutex
);
2727 if (!rdev
->desc
->ops
->set_current_limit
) {
2732 /* constraints check */
2733 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2737 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2739 mutex_unlock(&rdev
->mutex
);
2742 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2744 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2748 mutex_lock(&rdev
->mutex
);
2751 if (!rdev
->desc
->ops
->get_current_limit
) {
2756 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2758 mutex_unlock(&rdev
->mutex
);
2763 * regulator_get_current_limit - get regulator output current
2764 * @regulator: regulator source
2766 * This returns the current supplied by the specified current sink in uA.
2768 * NOTE: If the regulator is disabled it will return the current value. This
2769 * function should not be used to determine regulator state.
2771 int regulator_get_current_limit(struct regulator
*regulator
)
2773 return _regulator_get_current_limit(regulator
->rdev
);
2775 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2778 * regulator_set_mode - set regulator operating mode
2779 * @regulator: regulator source
2780 * @mode: operating mode - one of the REGULATOR_MODE constants
2782 * Set regulator operating mode to increase regulator efficiency or improve
2783 * regulation performance.
2785 * NOTE: Regulator system constraints must be set for this regulator before
2786 * calling this function otherwise this call will fail.
2788 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2790 struct regulator_dev
*rdev
= regulator
->rdev
;
2792 int regulator_curr_mode
;
2794 mutex_lock(&rdev
->mutex
);
2797 if (!rdev
->desc
->ops
->set_mode
) {
2802 /* return if the same mode is requested */
2803 if (rdev
->desc
->ops
->get_mode
) {
2804 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2805 if (regulator_curr_mode
== mode
) {
2811 /* constraints check */
2812 ret
= regulator_mode_constrain(rdev
, &mode
);
2816 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2818 mutex_unlock(&rdev
->mutex
);
2821 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2823 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2827 mutex_lock(&rdev
->mutex
);
2830 if (!rdev
->desc
->ops
->get_mode
) {
2835 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2837 mutex_unlock(&rdev
->mutex
);
2842 * regulator_get_mode - get regulator operating mode
2843 * @regulator: regulator source
2845 * Get the current regulator operating mode.
2847 unsigned int regulator_get_mode(struct regulator
*regulator
)
2849 return _regulator_get_mode(regulator
->rdev
);
2851 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2854 * regulator_set_optimum_mode - set regulator optimum operating mode
2855 * @regulator: regulator source
2856 * @uA_load: load current
2858 * Notifies the regulator core of a new device load. This is then used by
2859 * DRMS (if enabled by constraints) to set the most efficient regulator
2860 * operating mode for the new regulator loading.
2862 * Consumer devices notify their supply regulator of the maximum power
2863 * they will require (can be taken from device datasheet in the power
2864 * consumption tables) when they change operational status and hence power
2865 * state. Examples of operational state changes that can affect power
2866 * consumption are :-
2868 * o Device is opened / closed.
2869 * o Device I/O is about to begin or has just finished.
2870 * o Device is idling in between work.
2872 * This information is also exported via sysfs to userspace.
2874 * DRMS will sum the total requested load on the regulator and change
2875 * to the most efficient operating mode if platform constraints allow.
2877 * Returns the new regulator mode or error.
2879 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
2881 struct regulator_dev
*rdev
= regulator
->rdev
;
2882 struct regulator
*consumer
;
2883 int ret
, output_uV
, input_uV
= 0, total_uA_load
= 0;
2887 input_uV
= regulator_get_voltage(rdev
->supply
);
2889 mutex_lock(&rdev
->mutex
);
2892 * first check to see if we can set modes at all, otherwise just
2893 * tell the consumer everything is OK.
2895 regulator
->uA_load
= uA_load
;
2896 ret
= regulator_check_drms(rdev
);
2902 if (!rdev
->desc
->ops
->get_optimum_mode
)
2906 * we can actually do this so any errors are indicators of
2907 * potential real failure.
2911 if (!rdev
->desc
->ops
->set_mode
)
2914 /* get output voltage */
2915 output_uV
= _regulator_get_voltage(rdev
);
2916 if (output_uV
<= 0) {
2917 rdev_err(rdev
, "invalid output voltage found\n");
2921 /* No supply? Use constraint voltage */
2923 input_uV
= rdev
->constraints
->input_uV
;
2924 if (input_uV
<= 0) {
2925 rdev_err(rdev
, "invalid input voltage found\n");
2929 /* calc total requested load for this regulator */
2930 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
2931 total_uA_load
+= consumer
->uA_load
;
2933 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
2934 input_uV
, output_uV
,
2936 ret
= regulator_mode_constrain(rdev
, &mode
);
2938 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2939 total_uA_load
, input_uV
, output_uV
);
2943 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2945 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
2950 mutex_unlock(&rdev
->mutex
);
2953 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
2956 * regulator_set_bypass_regmap - Default set_bypass() using regmap
2958 * @rdev: device to operate on.
2959 * @enable: state to set.
2961 int regulator_set_bypass_regmap(struct regulator_dev
*rdev
, bool enable
)
2966 val
= rdev
->desc
->bypass_mask
;
2970 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->bypass_reg
,
2971 rdev
->desc
->bypass_mask
, val
);
2973 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap
);
2976 * regulator_get_bypass_regmap - Default get_bypass() using regmap
2978 * @rdev: device to operate on.
2979 * @enable: current state.
2981 int regulator_get_bypass_regmap(struct regulator_dev
*rdev
, bool *enable
)
2986 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->bypass_reg
, &val
);
2990 *enable
= val
& rdev
->desc
->bypass_mask
;
2994 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap
);
2997 * regulator_allow_bypass - allow the regulator to go into bypass mode
2999 * @regulator: Regulator to configure
3000 * @enable: enable or disable bypass mode
3002 * Allow the regulator to go into bypass mode if all other consumers
3003 * for the regulator also enable bypass mode and the machine
3004 * constraints allow this. Bypass mode means that the regulator is
3005 * simply passing the input directly to the output with no regulation.
3007 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3009 struct regulator_dev
*rdev
= regulator
->rdev
;
3012 if (!rdev
->desc
->ops
->set_bypass
)
3015 if (rdev
->constraints
&&
3016 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
3019 mutex_lock(&rdev
->mutex
);
3021 if (enable
&& !regulator
->bypass
) {
3022 rdev
->bypass_count
++;
3024 if (rdev
->bypass_count
== rdev
->open_count
) {
3025 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3027 rdev
->bypass_count
--;
3030 } else if (!enable
&& regulator
->bypass
) {
3031 rdev
->bypass_count
--;
3033 if (rdev
->bypass_count
!= rdev
->open_count
) {
3034 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3036 rdev
->bypass_count
++;
3041 regulator
->bypass
= enable
;
3043 mutex_unlock(&rdev
->mutex
);
3047 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3050 * regulator_register_notifier - register regulator event notifier
3051 * @regulator: regulator source
3052 * @nb: notifier block
3054 * Register notifier block to receive regulator events.
3056 int regulator_register_notifier(struct regulator
*regulator
,
3057 struct notifier_block
*nb
)
3059 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3062 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3065 * regulator_unregister_notifier - unregister regulator event notifier
3066 * @regulator: regulator source
3067 * @nb: notifier block
3069 * Unregister regulator event notifier block.
3071 int regulator_unregister_notifier(struct regulator
*regulator
,
3072 struct notifier_block
*nb
)
3074 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3077 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3079 /* notify regulator consumers and downstream regulator consumers.
3080 * Note mutex must be held by caller.
3082 static void _notifier_call_chain(struct regulator_dev
*rdev
,
3083 unsigned long event
, void *data
)
3085 /* call rdev chain first */
3086 blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3090 * regulator_bulk_get - get multiple regulator consumers
3092 * @dev: Device to supply
3093 * @num_consumers: Number of consumers to register
3094 * @consumers: Configuration of consumers; clients are stored here.
3096 * @return 0 on success, an errno on failure.
3098 * This helper function allows drivers to get several regulator
3099 * consumers in one operation. If any of the regulators cannot be
3100 * acquired then any regulators that were allocated will be freed
3101 * before returning to the caller.
3103 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3104 struct regulator_bulk_data
*consumers
)
3109 for (i
= 0; i
< num_consumers
; i
++)
3110 consumers
[i
].consumer
= NULL
;
3112 for (i
= 0; i
< num_consumers
; i
++) {
3113 consumers
[i
].consumer
= regulator_get(dev
,
3114 consumers
[i
].supply
);
3115 if (IS_ERR(consumers
[i
].consumer
)) {
3116 ret
= PTR_ERR(consumers
[i
].consumer
);
3117 dev_err(dev
, "Failed to get supply '%s': %d\n",
3118 consumers
[i
].supply
, ret
);
3119 consumers
[i
].consumer
= NULL
;
3128 regulator_put(consumers
[i
].consumer
);
3132 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3135 * devm_regulator_bulk_get - managed get multiple regulator consumers
3137 * @dev: Device to supply
3138 * @num_consumers: Number of consumers to register
3139 * @consumers: Configuration of consumers; clients are stored here.
3141 * @return 0 on success, an errno on failure.
3143 * This helper function allows drivers to get several regulator
3144 * consumers in one operation with management, the regulators will
3145 * automatically be freed when the device is unbound. If any of the
3146 * regulators cannot be acquired then any regulators that were
3147 * allocated will be freed before returning to the caller.
3149 int devm_regulator_bulk_get(struct device
*dev
, int num_consumers
,
3150 struct regulator_bulk_data
*consumers
)
3155 for (i
= 0; i
< num_consumers
; i
++)
3156 consumers
[i
].consumer
= NULL
;
3158 for (i
= 0; i
< num_consumers
; i
++) {
3159 consumers
[i
].consumer
= devm_regulator_get(dev
,
3160 consumers
[i
].supply
);
3161 if (IS_ERR(consumers
[i
].consumer
)) {
3162 ret
= PTR_ERR(consumers
[i
].consumer
);
3163 dev_err(dev
, "Failed to get supply '%s': %d\n",
3164 consumers
[i
].supply
, ret
);
3165 consumers
[i
].consumer
= NULL
;
3173 for (i
= 0; i
< num_consumers
&& consumers
[i
].consumer
; i
++)
3174 devm_regulator_put(consumers
[i
].consumer
);
3178 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get
);
3180 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3182 struct regulator_bulk_data
*bulk
= data
;
3184 bulk
->ret
= regulator_enable(bulk
->consumer
);
3188 * regulator_bulk_enable - enable multiple regulator consumers
3190 * @num_consumers: Number of consumers
3191 * @consumers: Consumer data; clients are stored here.
3192 * @return 0 on success, an errno on failure
3194 * This convenience API allows consumers to enable multiple regulator
3195 * clients in a single API call. If any consumers cannot be enabled
3196 * then any others that were enabled will be disabled again prior to
3199 int regulator_bulk_enable(int num_consumers
,
3200 struct regulator_bulk_data
*consumers
)
3202 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3206 for (i
= 0; i
< num_consumers
; i
++) {
3207 if (consumers
[i
].consumer
->always_on
)
3208 consumers
[i
].ret
= 0;
3210 async_schedule_domain(regulator_bulk_enable_async
,
3211 &consumers
[i
], &async_domain
);
3214 async_synchronize_full_domain(&async_domain
);
3216 /* If any consumer failed we need to unwind any that succeeded */
3217 for (i
= 0; i
< num_consumers
; i
++) {
3218 if (consumers
[i
].ret
!= 0) {
3219 ret
= consumers
[i
].ret
;
3227 for (i
= 0; i
< num_consumers
; i
++) {
3228 if (consumers
[i
].ret
< 0)
3229 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3232 regulator_disable(consumers
[i
].consumer
);
3237 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3240 * regulator_bulk_disable - disable multiple regulator consumers
3242 * @num_consumers: Number of consumers
3243 * @consumers: Consumer data; clients are stored here.
3244 * @return 0 on success, an errno on failure
3246 * This convenience API allows consumers to disable multiple regulator
3247 * clients in a single API call. If any consumers cannot be disabled
3248 * then any others that were disabled will be enabled again prior to
3251 int regulator_bulk_disable(int num_consumers
,
3252 struct regulator_bulk_data
*consumers
)
3257 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3258 ret
= regulator_disable(consumers
[i
].consumer
);
3266 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3267 for (++i
; i
< num_consumers
; ++i
) {
3268 r
= regulator_enable(consumers
[i
].consumer
);
3270 pr_err("Failed to reename %s: %d\n",
3271 consumers
[i
].supply
, r
);
3276 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3279 * regulator_bulk_force_disable - force disable multiple regulator consumers
3281 * @num_consumers: Number of consumers
3282 * @consumers: Consumer data; clients are stored here.
3283 * @return 0 on success, an errno on failure
3285 * This convenience API allows consumers to forcibly disable multiple regulator
3286 * clients in a single API call.
3287 * NOTE: This should be used for situations when device damage will
3288 * likely occur if the regulators are not disabled (e.g. over temp).
3289 * Although regulator_force_disable function call for some consumers can
3290 * return error numbers, the function is called for all consumers.
3292 int regulator_bulk_force_disable(int num_consumers
,
3293 struct regulator_bulk_data
*consumers
)
3298 for (i
= 0; i
< num_consumers
; i
++)
3300 regulator_force_disable(consumers
[i
].consumer
);
3302 for (i
= 0; i
< num_consumers
; i
++) {
3303 if (consumers
[i
].ret
!= 0) {
3304 ret
= consumers
[i
].ret
;
3313 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3316 * regulator_bulk_free - free multiple regulator consumers
3318 * @num_consumers: Number of consumers
3319 * @consumers: Consumer data; clients are stored here.
3321 * This convenience API allows consumers to free multiple regulator
3322 * clients in a single API call.
3324 void regulator_bulk_free(int num_consumers
,
3325 struct regulator_bulk_data
*consumers
)
3329 for (i
= 0; i
< num_consumers
; i
++) {
3330 regulator_put(consumers
[i
].consumer
);
3331 consumers
[i
].consumer
= NULL
;
3334 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3337 * regulator_notifier_call_chain - call regulator event notifier
3338 * @rdev: regulator source
3339 * @event: notifier block
3340 * @data: callback-specific data.
3342 * Called by regulator drivers to notify clients a regulator event has
3343 * occurred. We also notify regulator clients downstream.
3344 * Note lock must be held by caller.
3346 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3347 unsigned long event
, void *data
)
3349 _notifier_call_chain(rdev
, event
, data
);
3353 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3356 * regulator_mode_to_status - convert a regulator mode into a status
3358 * @mode: Mode to convert
3360 * Convert a regulator mode into a status.
3362 int regulator_mode_to_status(unsigned int mode
)
3365 case REGULATOR_MODE_FAST
:
3366 return REGULATOR_STATUS_FAST
;
3367 case REGULATOR_MODE_NORMAL
:
3368 return REGULATOR_STATUS_NORMAL
;
3369 case REGULATOR_MODE_IDLE
:
3370 return REGULATOR_STATUS_IDLE
;
3371 case REGULATOR_MODE_STANDBY
:
3372 return REGULATOR_STATUS_STANDBY
;
3374 return REGULATOR_STATUS_UNDEFINED
;
3377 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3380 * To avoid cluttering sysfs (and memory) with useless state, only
3381 * create attributes that can be meaningfully displayed.
3383 static int add_regulator_attributes(struct regulator_dev
*rdev
)
3385 struct device
*dev
= &rdev
->dev
;
3386 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3389 /* some attributes need specific methods to be displayed */
3390 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3391 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3392 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0)) {
3393 status
= device_create_file(dev
, &dev_attr_microvolts
);
3397 if (ops
->get_current_limit
) {
3398 status
= device_create_file(dev
, &dev_attr_microamps
);
3402 if (ops
->get_mode
) {
3403 status
= device_create_file(dev
, &dev_attr_opmode
);
3407 if (rdev
->ena_pin
|| ops
->is_enabled
) {
3408 status
= device_create_file(dev
, &dev_attr_state
);
3412 if (ops
->get_status
) {
3413 status
= device_create_file(dev
, &dev_attr_status
);
3417 if (ops
->get_bypass
) {
3418 status
= device_create_file(dev
, &dev_attr_bypass
);
3423 /* some attributes are type-specific */
3424 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
3425 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
3430 /* all the other attributes exist to support constraints;
3431 * don't show them if there are no constraints, or if the
3432 * relevant supporting methods are missing.
3434 if (!rdev
->constraints
)
3437 /* constraints need specific supporting methods */
3438 if (ops
->set_voltage
|| ops
->set_voltage_sel
) {
3439 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
3442 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
3446 if (ops
->set_current_limit
) {
3447 status
= device_create_file(dev
, &dev_attr_min_microamps
);
3450 status
= device_create_file(dev
, &dev_attr_max_microamps
);
3455 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
3458 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
3461 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
3465 if (ops
->set_suspend_voltage
) {
3466 status
= device_create_file(dev
,
3467 &dev_attr_suspend_standby_microvolts
);
3470 status
= device_create_file(dev
,
3471 &dev_attr_suspend_mem_microvolts
);
3474 status
= device_create_file(dev
,
3475 &dev_attr_suspend_disk_microvolts
);
3480 if (ops
->set_suspend_mode
) {
3481 status
= device_create_file(dev
,
3482 &dev_attr_suspend_standby_mode
);
3485 status
= device_create_file(dev
,
3486 &dev_attr_suspend_mem_mode
);
3489 status
= device_create_file(dev
,
3490 &dev_attr_suspend_disk_mode
);
3498 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3500 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3501 if (!rdev
->debugfs
) {
3502 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3506 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3508 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3510 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3511 &rdev
->bypass_count
);
3515 * regulator_register - register regulator
3516 * @regulator_desc: regulator to register
3517 * @config: runtime configuration for regulator
3519 * Called by regulator drivers to register a regulator.
3520 * Returns a valid pointer to struct regulator_dev on success
3521 * or an ERR_PTR() on error.
3523 struct regulator_dev
*
3524 regulator_register(const struct regulator_desc
*regulator_desc
,
3525 const struct regulator_config
*config
)
3527 const struct regulation_constraints
*constraints
= NULL
;
3528 const struct regulator_init_data
*init_data
;
3529 static atomic_t regulator_no
= ATOMIC_INIT(0);
3530 struct regulator_dev
*rdev
;
3533 const char *supply
= NULL
;
3535 if (regulator_desc
== NULL
|| config
== NULL
)
3536 return ERR_PTR(-EINVAL
);
3541 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3542 return ERR_PTR(-EINVAL
);
3544 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3545 regulator_desc
->type
!= REGULATOR_CURRENT
)
3546 return ERR_PTR(-EINVAL
);
3548 /* Only one of each should be implemented */
3549 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3550 regulator_desc
->ops
->get_voltage_sel
);
3551 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3552 regulator_desc
->ops
->set_voltage_sel
);
3554 /* If we're using selectors we must implement list_voltage. */
3555 if (regulator_desc
->ops
->get_voltage_sel
&&
3556 !regulator_desc
->ops
->list_voltage
) {
3557 return ERR_PTR(-EINVAL
);
3559 if (regulator_desc
->ops
->set_voltage_sel
&&
3560 !regulator_desc
->ops
->list_voltage
) {
3561 return ERR_PTR(-EINVAL
);
3564 init_data
= config
->init_data
;
3566 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3568 return ERR_PTR(-ENOMEM
);
3570 mutex_lock(®ulator_list_mutex
);
3572 mutex_init(&rdev
->mutex
);
3573 rdev
->reg_data
= config
->driver_data
;
3574 rdev
->owner
= regulator_desc
->owner
;
3575 rdev
->desc
= regulator_desc
;
3577 rdev
->regmap
= config
->regmap
;
3578 else if (dev_get_regmap(dev
, NULL
))
3579 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3580 else if (dev
->parent
)
3581 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3582 INIT_LIST_HEAD(&rdev
->consumer_list
);
3583 INIT_LIST_HEAD(&rdev
->list
);
3584 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3585 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3587 /* preform any regulator specific init */
3588 if (init_data
&& init_data
->regulator_init
) {
3589 ret
= init_data
->regulator_init(rdev
->reg_data
);
3594 /* register with sysfs */
3595 rdev
->dev
.class = ®ulator_class
;
3596 rdev
->dev
.of_node
= config
->of_node
;
3597 rdev
->dev
.parent
= dev
;
3598 dev_set_name(&rdev
->dev
, "regulator.%d",
3599 atomic_inc_return(®ulator_no
) - 1);
3600 ret
= device_register(&rdev
->dev
);
3602 put_device(&rdev
->dev
);
3606 dev_set_drvdata(&rdev
->dev
, rdev
);
3608 if (config
->ena_gpio
&& gpio_is_valid(config
->ena_gpio
)) {
3609 ret
= regulator_ena_gpio_request(rdev
, config
);
3611 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3612 config
->ena_gpio
, ret
);
3616 if (config
->ena_gpio_flags
& GPIOF_OUT_INIT_HIGH
)
3617 rdev
->ena_gpio_state
= 1;
3619 if (config
->ena_gpio_invert
)
3620 rdev
->ena_gpio_state
= !rdev
->ena_gpio_state
;
3623 /* set regulator constraints */
3625 constraints
= &init_data
->constraints
;
3627 ret
= set_machine_constraints(rdev
, constraints
);
3631 /* add attributes supported by this regulator */
3632 ret
= add_regulator_attributes(rdev
);
3636 if (init_data
&& init_data
->supply_regulator
)
3637 supply
= init_data
->supply_regulator
;
3638 else if (regulator_desc
->supply_name
)
3639 supply
= regulator_desc
->supply_name
;
3642 struct regulator_dev
*r
;
3644 r
= regulator_dev_lookup(dev
, supply
, &ret
);
3646 if (ret
== -ENODEV
) {
3648 * No supply was specified for this regulator and
3649 * there will never be one.
3654 dev_err(dev
, "Failed to find supply %s\n", supply
);
3655 ret
= -EPROBE_DEFER
;
3659 ret
= set_supply(rdev
, r
);
3663 /* Enable supply if rail is enabled */
3664 if (_regulator_is_enabled(rdev
)) {
3665 ret
= regulator_enable(rdev
->supply
);
3672 /* add consumers devices */
3674 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3675 ret
= set_consumer_device_supply(rdev
,
3676 init_data
->consumer_supplies
[i
].dev_name
,
3677 init_data
->consumer_supplies
[i
].supply
);
3679 dev_err(dev
, "Failed to set supply %s\n",
3680 init_data
->consumer_supplies
[i
].supply
);
3681 goto unset_supplies
;
3686 list_add(&rdev
->list
, ®ulator_list
);
3688 rdev_init_debugfs(rdev
);
3690 mutex_unlock(®ulator_list_mutex
);
3694 unset_regulator_supplies(rdev
);
3698 _regulator_put(rdev
->supply
);
3699 regulator_ena_gpio_free(rdev
);
3700 kfree(rdev
->constraints
);
3702 device_unregister(&rdev
->dev
);
3703 /* device core frees rdev */
3704 rdev
= ERR_PTR(ret
);
3709 rdev
= ERR_PTR(ret
);
3712 EXPORT_SYMBOL_GPL(regulator_register
);
3715 * regulator_unregister - unregister regulator
3716 * @rdev: regulator to unregister
3718 * Called by regulator drivers to unregister a regulator.
3720 void regulator_unregister(struct regulator_dev
*rdev
)
3726 regulator_put(rdev
->supply
);
3727 mutex_lock(®ulator_list_mutex
);
3728 debugfs_remove_recursive(rdev
->debugfs
);
3729 flush_work(&rdev
->disable_work
.work
);
3730 WARN_ON(rdev
->open_count
);
3731 unset_regulator_supplies(rdev
);
3732 list_del(&rdev
->list
);
3733 kfree(rdev
->constraints
);
3734 regulator_ena_gpio_free(rdev
);
3735 device_unregister(&rdev
->dev
);
3736 mutex_unlock(®ulator_list_mutex
);
3738 EXPORT_SYMBOL_GPL(regulator_unregister
);
3741 * regulator_suspend_prepare - prepare regulators for system wide suspend
3742 * @state: system suspend state
3744 * Configure each regulator with it's suspend operating parameters for state.
3745 * This will usually be called by machine suspend code prior to supending.
3747 int regulator_suspend_prepare(suspend_state_t state
)
3749 struct regulator_dev
*rdev
;
3752 /* ON is handled by regulator active state */
3753 if (state
== PM_SUSPEND_ON
)
3756 mutex_lock(®ulator_list_mutex
);
3757 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3759 mutex_lock(&rdev
->mutex
);
3760 ret
= suspend_prepare(rdev
, state
);
3761 mutex_unlock(&rdev
->mutex
);
3764 rdev_err(rdev
, "failed to prepare\n");
3769 mutex_unlock(®ulator_list_mutex
);
3772 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3775 * regulator_suspend_finish - resume regulators from system wide suspend
3777 * Turn on regulators that might be turned off by regulator_suspend_prepare
3778 * and that should be turned on according to the regulators properties.
3780 int regulator_suspend_finish(void)
3782 struct regulator_dev
*rdev
;
3785 mutex_lock(®ulator_list_mutex
);
3786 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3787 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3789 mutex_lock(&rdev
->mutex
);
3790 if ((rdev
->use_count
> 0 || rdev
->constraints
->always_on
) &&
3792 error
= ops
->enable(rdev
);
3796 if (!has_full_constraints
)
3800 if (!_regulator_is_enabled(rdev
))
3803 error
= ops
->disable(rdev
);
3808 mutex_unlock(&rdev
->mutex
);
3810 mutex_unlock(®ulator_list_mutex
);
3813 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3816 * regulator_has_full_constraints - the system has fully specified constraints
3818 * Calling this function will cause the regulator API to disable all
3819 * regulators which have a zero use count and don't have an always_on
3820 * constraint in a late_initcall.
3822 * The intention is that this will become the default behaviour in a
3823 * future kernel release so users are encouraged to use this facility
3826 void regulator_has_full_constraints(void)
3828 has_full_constraints
= 1;
3830 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3833 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3835 * Calling this function will cause the regulator API to provide a
3836 * dummy regulator to consumers if no physical regulator is found,
3837 * allowing most consumers to proceed as though a regulator were
3838 * configured. This allows systems such as those with software
3839 * controllable regulators for the CPU core only to be brought up more
3842 void regulator_use_dummy_regulator(void)
3844 board_wants_dummy_regulator
= true;
3846 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator
);
3849 * rdev_get_drvdata - get rdev regulator driver data
3852 * Get rdev regulator driver private data. This call can be used in the
3853 * regulator driver context.
3855 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3857 return rdev
->reg_data
;
3859 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3862 * regulator_get_drvdata - get regulator driver data
3863 * @regulator: regulator
3865 * Get regulator driver private data. This call can be used in the consumer
3866 * driver context when non API regulator specific functions need to be called.
3868 void *regulator_get_drvdata(struct regulator
*regulator
)
3870 return regulator
->rdev
->reg_data
;
3872 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3875 * regulator_set_drvdata - set regulator driver data
3876 * @regulator: regulator
3879 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3881 regulator
->rdev
->reg_data
= data
;
3883 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3886 * regulator_get_id - get regulator ID
3889 int rdev_get_id(struct regulator_dev
*rdev
)
3891 return rdev
->desc
->id
;
3893 EXPORT_SYMBOL_GPL(rdev_get_id
);
3895 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3899 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3901 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3903 return reg_init_data
->driver_data
;
3905 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3907 #ifdef CONFIG_DEBUG_FS
3908 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3909 size_t count
, loff_t
*ppos
)
3911 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3912 ssize_t len
, ret
= 0;
3913 struct regulator_map
*map
;
3918 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3919 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3921 rdev_get_name(map
->regulator
), map
->dev_name
,
3925 if (ret
> PAGE_SIZE
) {
3931 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3939 static const struct file_operations supply_map_fops
= {
3940 #ifdef CONFIG_DEBUG_FS
3941 .read
= supply_map_read_file
,
3942 .llseek
= default_llseek
,
3946 static int __init
regulator_init(void)
3950 ret
= class_register(®ulator_class
);
3952 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3954 pr_warn("regulator: Failed to create debugfs directory\n");
3956 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3959 regulator_dummy_init();
3964 /* init early to allow our consumers to complete system booting */
3965 core_initcall(regulator_init
);
3967 static int __init
regulator_init_complete(void)
3969 struct regulator_dev
*rdev
;
3970 struct regulator_ops
*ops
;
3971 struct regulation_constraints
*c
;
3975 * Since DT doesn't provide an idiomatic mechanism for
3976 * enabling full constraints and since it's much more natural
3977 * with DT to provide them just assume that a DT enabled
3978 * system has full constraints.
3980 if (of_have_populated_dt())
3981 has_full_constraints
= true;
3983 mutex_lock(®ulator_list_mutex
);
3985 /* If we have a full configuration then disable any regulators
3986 * which are not in use or always_on. This will become the
3987 * default behaviour in the future.
3989 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3990 ops
= rdev
->desc
->ops
;
3991 c
= rdev
->constraints
;
3993 if (!ops
->disable
|| (c
&& c
->always_on
))
3996 mutex_lock(&rdev
->mutex
);
3998 if (rdev
->use_count
)
4001 /* If we can't read the status assume it's on. */
4002 if (ops
->is_enabled
)
4003 enabled
= ops
->is_enabled(rdev
);
4010 if (has_full_constraints
) {
4011 /* We log since this may kill the system if it
4013 rdev_info(rdev
, "disabling\n");
4014 ret
= ops
->disable(rdev
);
4016 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4019 /* The intention is that in future we will
4020 * assume that full constraints are provided
4021 * so warn even if we aren't going to do
4024 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4028 mutex_unlock(&rdev
->mutex
);
4031 mutex_unlock(®ulator_list_mutex
);
4035 late_initcall(regulator_init_complete
);