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
;
922 static int _regulator_do_enable(struct regulator_dev
*rdev
);
925 * set_machine_constraints - sets regulator constraints
926 * @rdev: regulator source
927 * @constraints: constraints to apply
929 * Allows platform initialisation code to define and constrain
930 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
931 * Constraints *must* be set by platform code in order for some
932 * regulator operations to proceed i.e. set_voltage, set_current_limit,
935 static int set_machine_constraints(struct regulator_dev
*rdev
,
936 const struct regulation_constraints
*constraints
)
939 struct regulator_ops
*ops
= rdev
->desc
->ops
;
942 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
945 rdev
->constraints
= kzalloc(sizeof(*constraints
),
947 if (!rdev
->constraints
)
950 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
954 /* do we need to setup our suspend state */
955 if (rdev
->constraints
->initial_state
) {
956 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
958 rdev_err(rdev
, "failed to set suspend state\n");
963 if (rdev
->constraints
->initial_mode
) {
964 if (!ops
->set_mode
) {
965 rdev_err(rdev
, "no set_mode operation\n");
970 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
972 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
977 /* If the constraints say the regulator should be on at this point
978 * and we have control then make sure it is enabled.
980 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
981 ret
= _regulator_do_enable(rdev
);
982 if (ret
< 0 && ret
!= -EINVAL
) {
983 rdev_err(rdev
, "failed to enable\n");
988 if (rdev
->constraints
->ramp_delay
&& ops
->set_ramp_delay
) {
989 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
991 rdev_err(rdev
, "failed to set ramp_delay\n");
996 print_constraints(rdev
);
999 kfree(rdev
->constraints
);
1000 rdev
->constraints
= NULL
;
1005 * set_supply - set regulator supply regulator
1006 * @rdev: regulator name
1007 * @supply_rdev: supply regulator name
1009 * Called by platform initialisation code to set the supply regulator for this
1010 * regulator. This ensures that a regulators supply will also be enabled by the
1011 * core if it's child is enabled.
1013 static int set_supply(struct regulator_dev
*rdev
,
1014 struct regulator_dev
*supply_rdev
)
1018 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1020 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1021 if (rdev
->supply
== NULL
) {
1025 supply_rdev
->open_count
++;
1031 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1032 * @rdev: regulator source
1033 * @consumer_dev_name: dev_name() string for device supply applies to
1034 * @supply: symbolic name for supply
1036 * Allows platform initialisation code to map physical regulator
1037 * sources to symbolic names for supplies for use by devices. Devices
1038 * should use these symbolic names to request regulators, avoiding the
1039 * need to provide board-specific regulator names as platform data.
1041 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1042 const char *consumer_dev_name
,
1045 struct regulator_map
*node
;
1051 if (consumer_dev_name
!= NULL
)
1056 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1057 if (node
->dev_name
&& consumer_dev_name
) {
1058 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1060 } else if (node
->dev_name
|| consumer_dev_name
) {
1064 if (strcmp(node
->supply
, supply
) != 0)
1067 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1069 dev_name(&node
->regulator
->dev
),
1070 node
->regulator
->desc
->name
,
1072 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1076 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1080 node
->regulator
= rdev
;
1081 node
->supply
= supply
;
1084 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1085 if (node
->dev_name
== NULL
) {
1091 list_add(&node
->list
, ®ulator_map_list
);
1095 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1097 struct regulator_map
*node
, *n
;
1099 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1100 if (rdev
== node
->regulator
) {
1101 list_del(&node
->list
);
1102 kfree(node
->dev_name
);
1108 #define REG_STR_SIZE 64
1110 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1112 const char *supply_name
)
1114 struct regulator
*regulator
;
1115 char buf
[REG_STR_SIZE
];
1118 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1119 if (regulator
== NULL
)
1122 mutex_lock(&rdev
->mutex
);
1123 regulator
->rdev
= rdev
;
1124 list_add(®ulator
->list
, &rdev
->consumer_list
);
1127 regulator
->dev
= dev
;
1129 /* Add a link to the device sysfs entry */
1130 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1131 dev
->kobj
.name
, supply_name
);
1132 if (size
>= REG_STR_SIZE
)
1135 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1136 if (regulator
->supply_name
== NULL
)
1139 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1142 rdev_warn(rdev
, "could not add device link %s err %d\n",
1143 dev
->kobj
.name
, err
);
1147 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1148 if (regulator
->supply_name
== NULL
)
1152 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1154 if (!regulator
->debugfs
) {
1155 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1157 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1158 ®ulator
->uA_load
);
1159 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1160 ®ulator
->min_uV
);
1161 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1162 ®ulator
->max_uV
);
1166 * Check now if the regulator is an always on regulator - if
1167 * it is then we don't need to do nearly so much work for
1168 * enable/disable calls.
1170 if (!_regulator_can_change_status(rdev
) &&
1171 _regulator_is_enabled(rdev
))
1172 regulator
->always_on
= true;
1174 mutex_unlock(&rdev
->mutex
);
1177 list_del(®ulator
->list
);
1179 mutex_unlock(&rdev
->mutex
);
1183 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1185 if (!rdev
->desc
->ops
->enable_time
)
1186 return rdev
->desc
->enable_time
;
1187 return rdev
->desc
->ops
->enable_time(rdev
);
1190 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1194 struct regulator_dev
*r
;
1195 struct device_node
*node
;
1196 struct regulator_map
*map
;
1197 const char *devname
= NULL
;
1199 /* first do a dt based lookup */
1200 if (dev
&& dev
->of_node
) {
1201 node
= of_get_regulator(dev
, supply
);
1203 list_for_each_entry(r
, ®ulator_list
, list
)
1204 if (r
->dev
.parent
&&
1205 node
== r
->dev
.of_node
)
1209 * If we couldn't even get the node then it's
1210 * not just that the device didn't register
1211 * yet, there's no node and we'll never
1218 /* if not found, try doing it non-dt way */
1220 devname
= dev_name(dev
);
1222 list_for_each_entry(r
, ®ulator_list
, list
)
1223 if (strcmp(rdev_get_name(r
), supply
) == 0)
1226 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1227 /* If the mapping has a device set up it must match */
1228 if (map
->dev_name
&&
1229 (!devname
|| strcmp(map
->dev_name
, devname
)))
1232 if (strcmp(map
->supply
, supply
) == 0)
1233 return map
->regulator
;
1240 /* Internal regulator request function */
1241 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1244 struct regulator_dev
*rdev
;
1245 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1246 const char *devname
= NULL
;
1250 pr_err("get() with no identifier\n");
1255 devname
= dev_name(dev
);
1257 mutex_lock(®ulator_list_mutex
);
1259 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1264 * If we have return value from dev_lookup fail, we do not expect to
1265 * succeed, so, quit with appropriate error value
1268 regulator
= ERR_PTR(ret
);
1272 if (board_wants_dummy_regulator
) {
1273 rdev
= dummy_regulator_rdev
;
1277 #ifdef CONFIG_REGULATOR_DUMMY
1279 devname
= "deviceless";
1281 /* If the board didn't flag that it was fully constrained then
1282 * substitute in a dummy regulator so consumers can continue.
1284 if (!has_full_constraints
) {
1285 pr_warn("%s supply %s not found, using dummy regulator\n",
1287 rdev
= dummy_regulator_rdev
;
1292 mutex_unlock(®ulator_list_mutex
);
1296 if (rdev
->exclusive
) {
1297 regulator
= ERR_PTR(-EPERM
);
1301 if (exclusive
&& rdev
->open_count
) {
1302 regulator
= ERR_PTR(-EBUSY
);
1306 if (!try_module_get(rdev
->owner
))
1309 regulator
= create_regulator(rdev
, dev
, id
);
1310 if (regulator
== NULL
) {
1311 regulator
= ERR_PTR(-ENOMEM
);
1312 module_put(rdev
->owner
);
1318 rdev
->exclusive
= 1;
1320 ret
= _regulator_is_enabled(rdev
);
1322 rdev
->use_count
= 1;
1324 rdev
->use_count
= 0;
1328 mutex_unlock(®ulator_list_mutex
);
1334 * regulator_get - lookup and obtain a reference to a regulator.
1335 * @dev: device for regulator "consumer"
1336 * @id: Supply name or regulator ID.
1338 * Returns a struct regulator corresponding to the regulator producer,
1339 * or IS_ERR() condition containing errno.
1341 * Use of supply names configured via regulator_set_device_supply() is
1342 * strongly encouraged. It is recommended that the supply name used
1343 * should match the name used for the supply and/or the relevant
1344 * device pins in the datasheet.
1346 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1348 return _regulator_get(dev
, id
, 0);
1350 EXPORT_SYMBOL_GPL(regulator_get
);
1352 static void devm_regulator_release(struct device
*dev
, void *res
)
1354 regulator_put(*(struct regulator
**)res
);
1358 * devm_regulator_get - Resource managed regulator_get()
1359 * @dev: device for regulator "consumer"
1360 * @id: Supply name or regulator ID.
1362 * Managed regulator_get(). Regulators returned from this function are
1363 * automatically regulator_put() on driver detach. See regulator_get() for more
1366 struct regulator
*devm_regulator_get(struct device
*dev
, const char *id
)
1368 struct regulator
**ptr
, *regulator
;
1370 ptr
= devres_alloc(devm_regulator_release
, sizeof(*ptr
), GFP_KERNEL
);
1372 return ERR_PTR(-ENOMEM
);
1374 regulator
= regulator_get(dev
, id
);
1375 if (!IS_ERR(regulator
)) {
1377 devres_add(dev
, ptr
);
1384 EXPORT_SYMBOL_GPL(devm_regulator_get
);
1387 * regulator_get_exclusive - obtain exclusive access to a regulator.
1388 * @dev: device for regulator "consumer"
1389 * @id: Supply name or regulator ID.
1391 * Returns a struct regulator corresponding to the regulator producer,
1392 * or IS_ERR() condition containing errno. Other consumers will be
1393 * unable to obtain this reference is held and the use count for the
1394 * regulator will be initialised to reflect the current state of the
1397 * This is intended for use by consumers which cannot tolerate shared
1398 * use of the regulator such as those which need to force the
1399 * regulator off for correct operation of the hardware they are
1402 * Use of supply names configured via regulator_set_device_supply() is
1403 * strongly encouraged. It is recommended that the supply name used
1404 * should match the name used for the supply and/or the relevant
1405 * device pins in the datasheet.
1407 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1409 return _regulator_get(dev
, id
, 1);
1411 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1413 /* regulator_list_mutex lock held by regulator_put() */
1414 static void _regulator_put(struct regulator
*regulator
)
1416 struct regulator_dev
*rdev
;
1418 if (regulator
== NULL
|| IS_ERR(regulator
))
1421 rdev
= regulator
->rdev
;
1423 debugfs_remove_recursive(regulator
->debugfs
);
1425 /* remove any sysfs entries */
1427 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1428 mutex_lock(&rdev
->mutex
);
1429 kfree(regulator
->supply_name
);
1430 list_del(®ulator
->list
);
1434 rdev
->exclusive
= 0;
1435 mutex_unlock(&rdev
->mutex
);
1437 module_put(rdev
->owner
);
1441 * regulator_put - "free" the regulator source
1442 * @regulator: regulator source
1444 * Note: drivers must ensure that all regulator_enable calls made on this
1445 * regulator source are balanced by regulator_disable calls prior to calling
1448 void regulator_put(struct regulator
*regulator
)
1450 mutex_lock(®ulator_list_mutex
);
1451 _regulator_put(regulator
);
1452 mutex_unlock(®ulator_list_mutex
);
1454 EXPORT_SYMBOL_GPL(regulator_put
);
1456 static int devm_regulator_match(struct device
*dev
, void *res
, void *data
)
1458 struct regulator
**r
= res
;
1467 * devm_regulator_put - Resource managed regulator_put()
1468 * @regulator: regulator to free
1470 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1471 * this function will not need to be called and the resource management
1472 * code will ensure that the resource is freed.
1474 void devm_regulator_put(struct regulator
*regulator
)
1478 rc
= devres_release(regulator
->dev
, devm_regulator_release
,
1479 devm_regulator_match
, regulator
);
1483 EXPORT_SYMBOL_GPL(devm_regulator_put
);
1485 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1486 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1487 const struct regulator_config
*config
)
1489 struct regulator_enable_gpio
*pin
;
1492 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1493 if (pin
->gpio
== config
->ena_gpio
) {
1494 rdev_dbg(rdev
, "GPIO %d is already used\n",
1496 goto update_ena_gpio_to_rdev
;
1500 ret
= gpio_request_one(config
->ena_gpio
,
1501 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1502 rdev_get_name(rdev
));
1506 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1508 gpio_free(config
->ena_gpio
);
1512 pin
->gpio
= config
->ena_gpio
;
1513 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1514 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1516 update_ena_gpio_to_rdev
:
1517 pin
->request_count
++;
1518 rdev
->ena_pin
= pin
;
1522 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1524 struct regulator_enable_gpio
*pin
, *n
;
1529 /* Free the GPIO only in case of no use */
1530 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
1531 if (pin
->gpio
== rdev
->ena_pin
->gpio
) {
1532 if (pin
->request_count
<= 1) {
1533 pin
->request_count
= 0;
1534 gpio_free(pin
->gpio
);
1535 list_del(&pin
->list
);
1538 pin
->request_count
--;
1545 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1546 * @rdev: regulator_dev structure
1547 * @enable: enable GPIO at initial use?
1549 * GPIO is enabled in case of initial use. (enable_count is 0)
1550 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1552 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
1554 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
1560 /* Enable GPIO at initial use */
1561 if (pin
->enable_count
== 0)
1562 gpio_set_value_cansleep(pin
->gpio
,
1563 !pin
->ena_gpio_invert
);
1565 pin
->enable_count
++;
1567 if (pin
->enable_count
> 1) {
1568 pin
->enable_count
--;
1572 /* Disable GPIO if not used */
1573 if (pin
->enable_count
<= 1) {
1574 gpio_set_value_cansleep(pin
->gpio
,
1575 pin
->ena_gpio_invert
);
1576 pin
->enable_count
= 0;
1583 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1587 /* Query before enabling in case configuration dependent. */
1588 ret
= _regulator_get_enable_time(rdev
);
1592 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1596 trace_regulator_enable(rdev_get_name(rdev
));
1598 if (rdev
->ena_pin
) {
1599 if (!rdev
->ena_gpio_state
) {
1600 ret
= regulator_ena_gpio_ctrl(rdev
, true);
1603 rdev
->ena_gpio_state
= 1;
1605 } else if (rdev
->desc
->ops
->enable
) {
1606 ret
= rdev
->desc
->ops
->enable(rdev
);
1613 /* Allow the regulator to ramp; it would be useful to extend
1614 * this for bulk operations so that the regulators can ramp
1616 trace_regulator_enable_delay(rdev_get_name(rdev
));
1618 if (delay
>= 1000) {
1619 mdelay(delay
/ 1000);
1620 udelay(delay
% 1000);
1625 trace_regulator_enable_complete(rdev_get_name(rdev
));
1630 /* locks held by regulator_enable() */
1631 static int _regulator_enable(struct regulator_dev
*rdev
)
1635 /* check voltage and requested load before enabling */
1636 if (rdev
->constraints
&&
1637 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1638 drms_uA_update(rdev
);
1640 if (rdev
->use_count
== 0) {
1641 /* The regulator may on if it's not switchable or left on */
1642 ret
= _regulator_is_enabled(rdev
);
1643 if (ret
== -EINVAL
|| ret
== 0) {
1644 if (!_regulator_can_change_status(rdev
))
1647 ret
= _regulator_do_enable(rdev
);
1651 } else if (ret
< 0) {
1652 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1655 /* Fallthrough on positive return values - already enabled */
1664 * regulator_enable - enable regulator output
1665 * @regulator: regulator source
1667 * Request that the regulator be enabled with the regulator output at
1668 * the predefined voltage or current value. Calls to regulator_enable()
1669 * must be balanced with calls to regulator_disable().
1671 * NOTE: the output value can be set by other drivers, boot loader or may be
1672 * hardwired in the regulator.
1674 int regulator_enable(struct regulator
*regulator
)
1676 struct regulator_dev
*rdev
= regulator
->rdev
;
1679 if (regulator
->always_on
)
1683 ret
= regulator_enable(rdev
->supply
);
1688 mutex_lock(&rdev
->mutex
);
1689 ret
= _regulator_enable(rdev
);
1690 mutex_unlock(&rdev
->mutex
);
1692 if (ret
!= 0 && rdev
->supply
)
1693 regulator_disable(rdev
->supply
);
1697 EXPORT_SYMBOL_GPL(regulator_enable
);
1699 static int _regulator_do_disable(struct regulator_dev
*rdev
)
1703 trace_regulator_disable(rdev_get_name(rdev
));
1705 if (rdev
->ena_pin
) {
1706 if (rdev
->ena_gpio_state
) {
1707 ret
= regulator_ena_gpio_ctrl(rdev
, false);
1710 rdev
->ena_gpio_state
= 0;
1713 } else if (rdev
->desc
->ops
->disable
) {
1714 ret
= rdev
->desc
->ops
->disable(rdev
);
1719 trace_regulator_disable_complete(rdev_get_name(rdev
));
1724 /* locks held by regulator_disable() */
1725 static int _regulator_disable(struct regulator_dev
*rdev
)
1729 if (WARN(rdev
->use_count
<= 0,
1730 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1733 /* are we the last user and permitted to disable ? */
1734 if (rdev
->use_count
== 1 &&
1735 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1737 /* we are last user */
1738 if (_regulator_can_change_status(rdev
)) {
1739 ret
= _regulator_do_disable(rdev
);
1741 rdev_err(rdev
, "failed to disable\n");
1744 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1748 rdev
->use_count
= 0;
1749 } else if (rdev
->use_count
> 1) {
1751 if (rdev
->constraints
&&
1752 (rdev
->constraints
->valid_ops_mask
&
1753 REGULATOR_CHANGE_DRMS
))
1754 drms_uA_update(rdev
);
1763 * regulator_disable - disable regulator output
1764 * @regulator: regulator source
1766 * Disable the regulator output voltage or current. Calls to
1767 * regulator_enable() must be balanced with calls to
1768 * regulator_disable().
1770 * NOTE: this will only disable the regulator output if no other consumer
1771 * devices have it enabled, the regulator device supports disabling and
1772 * machine constraints permit this operation.
1774 int regulator_disable(struct regulator
*regulator
)
1776 struct regulator_dev
*rdev
= regulator
->rdev
;
1779 if (regulator
->always_on
)
1782 mutex_lock(&rdev
->mutex
);
1783 ret
= _regulator_disable(rdev
);
1784 mutex_unlock(&rdev
->mutex
);
1786 if (ret
== 0 && rdev
->supply
)
1787 regulator_disable(rdev
->supply
);
1791 EXPORT_SYMBOL_GPL(regulator_disable
);
1793 /* locks held by regulator_force_disable() */
1794 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1798 ret
= _regulator_do_disable(rdev
);
1800 rdev_err(rdev
, "failed to force disable\n");
1804 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1805 REGULATOR_EVENT_DISABLE
, NULL
);
1811 * regulator_force_disable - force disable regulator output
1812 * @regulator: regulator source
1814 * Forcibly disable the regulator output voltage or current.
1815 * NOTE: this *will* disable the regulator output even if other consumer
1816 * devices have it enabled. This should be used for situations when device
1817 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1819 int regulator_force_disable(struct regulator
*regulator
)
1821 struct regulator_dev
*rdev
= regulator
->rdev
;
1824 mutex_lock(&rdev
->mutex
);
1825 regulator
->uA_load
= 0;
1826 ret
= _regulator_force_disable(regulator
->rdev
);
1827 mutex_unlock(&rdev
->mutex
);
1830 while (rdev
->open_count
--)
1831 regulator_disable(rdev
->supply
);
1835 EXPORT_SYMBOL_GPL(regulator_force_disable
);
1837 static void regulator_disable_work(struct work_struct
*work
)
1839 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
1843 mutex_lock(&rdev
->mutex
);
1845 BUG_ON(!rdev
->deferred_disables
);
1847 count
= rdev
->deferred_disables
;
1848 rdev
->deferred_disables
= 0;
1850 for (i
= 0; i
< count
; i
++) {
1851 ret
= _regulator_disable(rdev
);
1853 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
1856 mutex_unlock(&rdev
->mutex
);
1859 for (i
= 0; i
< count
; i
++) {
1860 ret
= regulator_disable(rdev
->supply
);
1863 "Supply disable failed: %d\n", ret
);
1870 * regulator_disable_deferred - disable regulator output with delay
1871 * @regulator: regulator source
1872 * @ms: miliseconds until the regulator is disabled
1874 * Execute regulator_disable() on the regulator after a delay. This
1875 * is intended for use with devices that require some time to quiesce.
1877 * NOTE: this will only disable the regulator output if no other consumer
1878 * devices have it enabled, the regulator device supports disabling and
1879 * machine constraints permit this operation.
1881 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
1883 struct regulator_dev
*rdev
= regulator
->rdev
;
1886 if (regulator
->always_on
)
1890 return regulator_disable(regulator
);
1892 mutex_lock(&rdev
->mutex
);
1893 rdev
->deferred_disables
++;
1894 mutex_unlock(&rdev
->mutex
);
1896 ret
= schedule_delayed_work(&rdev
->disable_work
,
1897 msecs_to_jiffies(ms
));
1903 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
1906 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1908 * @rdev: regulator to operate on
1910 * Regulators that use regmap for their register I/O can set the
1911 * enable_reg and enable_mask fields in their descriptor and then use
1912 * this as their is_enabled operation, saving some code.
1914 int regulator_is_enabled_regmap(struct regulator_dev
*rdev
)
1919 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->enable_reg
, &val
);
1923 if (rdev
->desc
->enable_is_inverted
)
1924 return (val
& rdev
->desc
->enable_mask
) == 0;
1926 return (val
& rdev
->desc
->enable_mask
) != 0;
1928 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap
);
1931 * regulator_enable_regmap - standard enable() for regmap users
1933 * @rdev: regulator to operate on
1935 * Regulators that use regmap for their register I/O can set the
1936 * enable_reg and enable_mask fields in their descriptor and then use
1937 * this as their enable() operation, saving some code.
1939 int regulator_enable_regmap(struct regulator_dev
*rdev
)
1943 if (rdev
->desc
->enable_is_inverted
)
1946 val
= rdev
->desc
->enable_mask
;
1948 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1949 rdev
->desc
->enable_mask
, val
);
1951 EXPORT_SYMBOL_GPL(regulator_enable_regmap
);
1954 * regulator_disable_regmap - standard disable() for regmap users
1956 * @rdev: regulator to operate on
1958 * Regulators that use regmap for their register I/O can set the
1959 * enable_reg and enable_mask fields in their descriptor and then use
1960 * this as their disable() operation, saving some code.
1962 int regulator_disable_regmap(struct regulator_dev
*rdev
)
1966 if (rdev
->desc
->enable_is_inverted
)
1967 val
= rdev
->desc
->enable_mask
;
1971 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1972 rdev
->desc
->enable_mask
, val
);
1974 EXPORT_SYMBOL_GPL(regulator_disable_regmap
);
1976 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
1978 /* A GPIO control always takes precedence */
1980 return rdev
->ena_gpio_state
;
1982 /* If we don't know then assume that the regulator is always on */
1983 if (!rdev
->desc
->ops
->is_enabled
)
1986 return rdev
->desc
->ops
->is_enabled(rdev
);
1990 * regulator_is_enabled - is the regulator output enabled
1991 * @regulator: regulator source
1993 * Returns positive if the regulator driver backing the source/client
1994 * has requested that the device be enabled, zero if it hasn't, else a
1995 * negative errno code.
1997 * Note that the device backing this regulator handle can have multiple
1998 * users, so it might be enabled even if regulator_enable() was never
1999 * called for this particular source.
2001 int regulator_is_enabled(struct regulator
*regulator
)
2005 if (regulator
->always_on
)
2008 mutex_lock(®ulator
->rdev
->mutex
);
2009 ret
= _regulator_is_enabled(regulator
->rdev
);
2010 mutex_unlock(®ulator
->rdev
->mutex
);
2014 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2017 * regulator_can_change_voltage - check if regulator can change voltage
2018 * @regulator: regulator source
2020 * Returns positive if the regulator driver backing the source/client
2021 * can change its voltage, false otherwise. Usefull for detecting fixed
2022 * or dummy regulators and disabling voltage change logic in the client
2025 int regulator_can_change_voltage(struct regulator
*regulator
)
2027 struct regulator_dev
*rdev
= regulator
->rdev
;
2029 if (rdev
->constraints
&&
2030 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2031 if (rdev
->desc
->n_voltages
- rdev
->desc
->linear_min_sel
> 1)
2034 if (rdev
->desc
->continuous_voltage_range
&&
2035 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
&&
2036 rdev
->constraints
->min_uV
!= rdev
->constraints
->max_uV
)
2042 EXPORT_SYMBOL_GPL(regulator_can_change_voltage
);
2045 * regulator_count_voltages - count regulator_list_voltage() selectors
2046 * @regulator: regulator source
2048 * Returns number of selectors, or negative errno. Selectors are
2049 * numbered starting at zero, and typically correspond to bitfields
2050 * in hardware registers.
2052 int regulator_count_voltages(struct regulator
*regulator
)
2054 struct regulator_dev
*rdev
= regulator
->rdev
;
2056 return rdev
->desc
->n_voltages
? : -EINVAL
;
2058 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2061 * regulator_list_voltage_linear - List voltages with simple calculation
2063 * @rdev: Regulator device
2064 * @selector: Selector to convert into a voltage
2066 * Regulators with a simple linear mapping between voltages and
2067 * selectors can set min_uV and uV_step in the regulator descriptor
2068 * and then use this function as their list_voltage() operation,
2070 int regulator_list_voltage_linear(struct regulator_dev
*rdev
,
2071 unsigned int selector
)
2073 if (selector
>= rdev
->desc
->n_voltages
)
2075 if (selector
< rdev
->desc
->linear_min_sel
)
2078 selector
-= rdev
->desc
->linear_min_sel
;
2080 return rdev
->desc
->min_uV
+ (rdev
->desc
->uV_step
* selector
);
2082 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear
);
2085 * regulator_list_voltage_table - List voltages with table based mapping
2087 * @rdev: Regulator device
2088 * @selector: Selector to convert into a voltage
2090 * Regulators with table based mapping between voltages and
2091 * selectors can set volt_table in the regulator descriptor
2092 * and then use this function as their list_voltage() operation.
2094 int regulator_list_voltage_table(struct regulator_dev
*rdev
,
2095 unsigned int selector
)
2097 if (!rdev
->desc
->volt_table
) {
2098 BUG_ON(!rdev
->desc
->volt_table
);
2102 if (selector
>= rdev
->desc
->n_voltages
)
2105 return rdev
->desc
->volt_table
[selector
];
2107 EXPORT_SYMBOL_GPL(regulator_list_voltage_table
);
2110 * regulator_list_voltage - enumerate supported voltages
2111 * @regulator: regulator source
2112 * @selector: identify voltage to list
2113 * Context: can sleep
2115 * Returns a voltage that can be passed to @regulator_set_voltage(),
2116 * zero if this selector code can't be used on this system, or a
2119 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2121 struct regulator_dev
*rdev
= regulator
->rdev
;
2122 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2125 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
2128 mutex_lock(&rdev
->mutex
);
2129 ret
= ops
->list_voltage(rdev
, selector
);
2130 mutex_unlock(&rdev
->mutex
);
2133 if (ret
< rdev
->constraints
->min_uV
)
2135 else if (ret
> rdev
->constraints
->max_uV
)
2141 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2144 * regulator_is_supported_voltage - check if a voltage range can be supported
2146 * @regulator: Regulator to check.
2147 * @min_uV: Minimum required voltage in uV.
2148 * @max_uV: Maximum required voltage in uV.
2150 * Returns a boolean or a negative error code.
2152 int regulator_is_supported_voltage(struct regulator
*regulator
,
2153 int min_uV
, int max_uV
)
2155 struct regulator_dev
*rdev
= regulator
->rdev
;
2156 int i
, voltages
, ret
;
2158 /* If we can't change voltage check the current voltage */
2159 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
2160 ret
= regulator_get_voltage(regulator
);
2162 return (min_uV
<= ret
&& ret
<= max_uV
);
2167 /* Any voltage within constrains range is fine? */
2168 if (rdev
->desc
->continuous_voltage_range
)
2169 return min_uV
>= rdev
->constraints
->min_uV
&&
2170 max_uV
<= rdev
->constraints
->max_uV
;
2172 ret
= regulator_count_voltages(regulator
);
2177 for (i
= 0; i
< voltages
; i
++) {
2178 ret
= regulator_list_voltage(regulator
, i
);
2180 if (ret
>= min_uV
&& ret
<= max_uV
)
2186 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2189 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2191 * @rdev: regulator to operate on
2193 * Regulators that use regmap for their register I/O can set the
2194 * vsel_reg and vsel_mask fields in their descriptor and then use this
2195 * as their get_voltage_vsel operation, saving some code.
2197 int regulator_get_voltage_sel_regmap(struct regulator_dev
*rdev
)
2202 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->vsel_reg
, &val
);
2206 val
&= rdev
->desc
->vsel_mask
;
2207 val
>>= ffs(rdev
->desc
->vsel_mask
) - 1;
2211 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap
);
2214 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2216 * @rdev: regulator to operate on
2217 * @sel: Selector to set
2219 * Regulators that use regmap for their register I/O can set the
2220 * vsel_reg and vsel_mask fields in their descriptor and then use this
2221 * as their set_voltage_vsel operation, saving some code.
2223 int regulator_set_voltage_sel_regmap(struct regulator_dev
*rdev
, unsigned sel
)
2227 sel
<<= ffs(rdev
->desc
->vsel_mask
) - 1;
2229 ret
= regmap_update_bits(rdev
->regmap
, rdev
->desc
->vsel_reg
,
2230 rdev
->desc
->vsel_mask
, sel
);
2234 if (rdev
->desc
->apply_bit
)
2235 ret
= regmap_update_bits(rdev
->regmap
, rdev
->desc
->apply_reg
,
2236 rdev
->desc
->apply_bit
,
2237 rdev
->desc
->apply_bit
);
2240 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap
);
2243 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2245 * @rdev: Regulator to operate on
2246 * @min_uV: Lower bound for voltage
2247 * @max_uV: Upper bound for voltage
2249 * Drivers implementing set_voltage_sel() and list_voltage() can use
2250 * this as their map_voltage() operation. It will find a suitable
2251 * voltage by calling list_voltage() until it gets something in bounds
2252 * for the requested voltages.
2254 int regulator_map_voltage_iterate(struct regulator_dev
*rdev
,
2255 int min_uV
, int max_uV
)
2257 int best_val
= INT_MAX
;
2261 /* Find the smallest voltage that falls within the specified
2264 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2265 ret
= rdev
->desc
->ops
->list_voltage(rdev
, i
);
2269 if (ret
< best_val
&& ret
>= min_uV
&& ret
<= max_uV
) {
2275 if (best_val
!= INT_MAX
)
2280 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate
);
2283 * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
2285 * @rdev: Regulator to operate on
2286 * @min_uV: Lower bound for voltage
2287 * @max_uV: Upper bound for voltage
2289 * Drivers that have ascendant voltage list can use this as their
2290 * map_voltage() operation.
2292 int regulator_map_voltage_ascend(struct regulator_dev
*rdev
,
2293 int min_uV
, int max_uV
)
2297 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2298 ret
= rdev
->desc
->ops
->list_voltage(rdev
, i
);
2305 if (ret
>= min_uV
&& ret
<= max_uV
)
2311 EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend
);
2314 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2316 * @rdev: Regulator to operate on
2317 * @min_uV: Lower bound for voltage
2318 * @max_uV: Upper bound for voltage
2320 * Drivers providing min_uV and uV_step in their regulator_desc can
2321 * use this as their map_voltage() operation.
2323 int regulator_map_voltage_linear(struct regulator_dev
*rdev
,
2324 int min_uV
, int max_uV
)
2328 /* Allow uV_step to be 0 for fixed voltage */
2329 if (rdev
->desc
->n_voltages
== 1 && rdev
->desc
->uV_step
== 0) {
2330 if (min_uV
<= rdev
->desc
->min_uV
&& rdev
->desc
->min_uV
<= max_uV
)
2336 if (!rdev
->desc
->uV_step
) {
2337 BUG_ON(!rdev
->desc
->uV_step
);
2341 if (min_uV
< rdev
->desc
->min_uV
)
2342 min_uV
= rdev
->desc
->min_uV
;
2344 ret
= DIV_ROUND_UP(min_uV
- rdev
->desc
->min_uV
, rdev
->desc
->uV_step
);
2348 ret
+= rdev
->desc
->linear_min_sel
;
2350 /* Map back into a voltage to verify we're still in bounds */
2351 voltage
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2352 if (voltage
< min_uV
|| voltage
> max_uV
)
2357 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear
);
2359 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2360 int min_uV
, int max_uV
)
2365 unsigned int selector
;
2366 int old_selector
= -1;
2368 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2370 min_uV
+= rdev
->constraints
->uV_offset
;
2371 max_uV
+= rdev
->constraints
->uV_offset
;
2374 * If we can't obtain the old selector there is not enough
2375 * info to call set_voltage_time_sel().
2377 if (_regulator_is_enabled(rdev
) &&
2378 rdev
->desc
->ops
->set_voltage_time_sel
&&
2379 rdev
->desc
->ops
->get_voltage_sel
) {
2380 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2381 if (old_selector
< 0)
2382 return old_selector
;
2385 if (rdev
->desc
->ops
->set_voltage
) {
2386 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
,
2390 if (rdev
->desc
->ops
->list_voltage
)
2391 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2394 best_val
= _regulator_get_voltage(rdev
);
2397 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2398 if (rdev
->desc
->ops
->map_voltage
) {
2399 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2402 if (rdev
->desc
->ops
->list_voltage
==
2403 regulator_list_voltage_linear
)
2404 ret
= regulator_map_voltage_linear(rdev
,
2407 ret
= regulator_map_voltage_iterate(rdev
,
2412 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2413 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2415 if (old_selector
== selector
)
2418 ret
= rdev
->desc
->ops
->set_voltage_sel(
2428 /* Call set_voltage_time_sel if successfully obtained old_selector */
2429 if (ret
== 0 && _regulator_is_enabled(rdev
) && old_selector
>= 0 &&
2430 old_selector
!= selector
&& rdev
->desc
->ops
->set_voltage_time_sel
) {
2432 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2433 old_selector
, selector
);
2435 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2440 /* Insert any necessary delays */
2441 if (delay
>= 1000) {
2442 mdelay(delay
/ 1000);
2443 udelay(delay
% 1000);
2449 if (ret
== 0 && best_val
>= 0) {
2450 unsigned long data
= best_val
;
2452 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2456 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2462 * regulator_set_voltage - set regulator output voltage
2463 * @regulator: regulator source
2464 * @min_uV: Minimum required voltage in uV
2465 * @max_uV: Maximum acceptable voltage in uV
2467 * Sets a voltage regulator to the desired output voltage. This can be set
2468 * during any regulator state. IOW, regulator can be disabled or enabled.
2470 * If the regulator is enabled then the voltage will change to the new value
2471 * immediately otherwise if the regulator is disabled the regulator will
2472 * output at the new voltage when enabled.
2474 * NOTE: If the regulator is shared between several devices then the lowest
2475 * request voltage that meets the system constraints will be used.
2476 * Regulator system constraints must be set for this regulator before
2477 * calling this function otherwise this call will fail.
2479 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2481 struct regulator_dev
*rdev
= regulator
->rdev
;
2483 int old_min_uV
, old_max_uV
;
2485 mutex_lock(&rdev
->mutex
);
2487 /* If we're setting the same range as last time the change
2488 * should be a noop (some cpufreq implementations use the same
2489 * voltage for multiple frequencies, for example).
2491 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2495 if (!rdev
->desc
->ops
->set_voltage
&&
2496 !rdev
->desc
->ops
->set_voltage_sel
) {
2501 /* constraints check */
2502 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2506 /* restore original values in case of error */
2507 old_min_uV
= regulator
->min_uV
;
2508 old_max_uV
= regulator
->max_uV
;
2509 regulator
->min_uV
= min_uV
;
2510 regulator
->max_uV
= max_uV
;
2512 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2516 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2521 mutex_unlock(&rdev
->mutex
);
2524 regulator
->min_uV
= old_min_uV
;
2525 regulator
->max_uV
= old_max_uV
;
2526 mutex_unlock(&rdev
->mutex
);
2529 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2532 * regulator_set_voltage_time - get raise/fall time
2533 * @regulator: regulator source
2534 * @old_uV: starting voltage in microvolts
2535 * @new_uV: target voltage in microvolts
2537 * Provided with the starting and ending voltage, this function attempts to
2538 * calculate the time in microseconds required to rise or fall to this new
2541 int regulator_set_voltage_time(struct regulator
*regulator
,
2542 int old_uV
, int new_uV
)
2544 struct regulator_dev
*rdev
= regulator
->rdev
;
2545 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2551 /* Currently requires operations to do this */
2552 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2553 || !rdev
->desc
->n_voltages
)
2556 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2557 /* We only look for exact voltage matches here */
2558 voltage
= regulator_list_voltage(regulator
, i
);
2563 if (voltage
== old_uV
)
2565 if (voltage
== new_uV
)
2569 if (old_sel
< 0 || new_sel
< 0)
2572 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2574 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2577 * regulator_set_voltage_time_sel - get raise/fall time
2578 * @rdev: regulator source device
2579 * @old_selector: selector for starting voltage
2580 * @new_selector: selector for target voltage
2582 * Provided with the starting and target voltage selectors, this function
2583 * returns time in microseconds required to rise or fall to this new voltage
2585 * Drivers providing ramp_delay in regulation_constraints can use this as their
2586 * set_voltage_time_sel() operation.
2588 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2589 unsigned int old_selector
,
2590 unsigned int new_selector
)
2592 unsigned int ramp_delay
= 0;
2593 int old_volt
, new_volt
;
2595 if (rdev
->constraints
->ramp_delay
)
2596 ramp_delay
= rdev
->constraints
->ramp_delay
;
2597 else if (rdev
->desc
->ramp_delay
)
2598 ramp_delay
= rdev
->desc
->ramp_delay
;
2600 if (ramp_delay
== 0) {
2601 rdev_warn(rdev
, "ramp_delay not set\n");
2606 if (!rdev
->desc
->ops
->list_voltage
)
2609 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2610 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2612 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2614 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2617 * regulator_sync_voltage - re-apply last regulator output voltage
2618 * @regulator: regulator source
2620 * Re-apply the last configured voltage. This is intended to be used
2621 * where some external control source the consumer is cooperating with
2622 * has caused the configured voltage to change.
2624 int regulator_sync_voltage(struct regulator
*regulator
)
2626 struct regulator_dev
*rdev
= regulator
->rdev
;
2627 int ret
, min_uV
, max_uV
;
2629 mutex_lock(&rdev
->mutex
);
2631 if (!rdev
->desc
->ops
->set_voltage
&&
2632 !rdev
->desc
->ops
->set_voltage_sel
) {
2637 /* This is only going to work if we've had a voltage configured. */
2638 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2643 min_uV
= regulator
->min_uV
;
2644 max_uV
= regulator
->max_uV
;
2646 /* This should be a paranoia check... */
2647 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2651 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2655 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2658 mutex_unlock(&rdev
->mutex
);
2661 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2663 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2667 if (rdev
->desc
->ops
->get_voltage_sel
) {
2668 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2671 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2672 } else if (rdev
->desc
->ops
->get_voltage
) {
2673 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2674 } else if (rdev
->desc
->ops
->list_voltage
) {
2675 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2682 return ret
- rdev
->constraints
->uV_offset
;
2686 * regulator_get_voltage - get regulator output voltage
2687 * @regulator: regulator source
2689 * This returns the current regulator voltage in uV.
2691 * NOTE: If the regulator is disabled it will return the voltage value. This
2692 * function should not be used to determine regulator state.
2694 int regulator_get_voltage(struct regulator
*regulator
)
2698 mutex_lock(®ulator
->rdev
->mutex
);
2700 ret
= _regulator_get_voltage(regulator
->rdev
);
2702 mutex_unlock(®ulator
->rdev
->mutex
);
2706 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2709 * regulator_set_current_limit - set regulator output current limit
2710 * @regulator: regulator source
2711 * @min_uA: Minimum supported current in uA
2712 * @max_uA: Maximum supported current in uA
2714 * Sets current sink to the desired output current. This can be set during
2715 * any regulator state. IOW, regulator can be disabled or enabled.
2717 * If the regulator is enabled then the current will change to the new value
2718 * immediately otherwise if the regulator is disabled the regulator will
2719 * output at the new current when enabled.
2721 * NOTE: Regulator system constraints must be set for this regulator before
2722 * calling this function otherwise this call will fail.
2724 int regulator_set_current_limit(struct regulator
*regulator
,
2725 int min_uA
, int max_uA
)
2727 struct regulator_dev
*rdev
= regulator
->rdev
;
2730 mutex_lock(&rdev
->mutex
);
2733 if (!rdev
->desc
->ops
->set_current_limit
) {
2738 /* constraints check */
2739 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2743 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2745 mutex_unlock(&rdev
->mutex
);
2748 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2750 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2754 mutex_lock(&rdev
->mutex
);
2757 if (!rdev
->desc
->ops
->get_current_limit
) {
2762 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2764 mutex_unlock(&rdev
->mutex
);
2769 * regulator_get_current_limit - get regulator output current
2770 * @regulator: regulator source
2772 * This returns the current supplied by the specified current sink in uA.
2774 * NOTE: If the regulator is disabled it will return the current value. This
2775 * function should not be used to determine regulator state.
2777 int regulator_get_current_limit(struct regulator
*regulator
)
2779 return _regulator_get_current_limit(regulator
->rdev
);
2781 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2784 * regulator_set_mode - set regulator operating mode
2785 * @regulator: regulator source
2786 * @mode: operating mode - one of the REGULATOR_MODE constants
2788 * Set regulator operating mode to increase regulator efficiency or improve
2789 * regulation performance.
2791 * NOTE: Regulator system constraints must be set for this regulator before
2792 * calling this function otherwise this call will fail.
2794 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2796 struct regulator_dev
*rdev
= regulator
->rdev
;
2798 int regulator_curr_mode
;
2800 mutex_lock(&rdev
->mutex
);
2803 if (!rdev
->desc
->ops
->set_mode
) {
2808 /* return if the same mode is requested */
2809 if (rdev
->desc
->ops
->get_mode
) {
2810 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2811 if (regulator_curr_mode
== mode
) {
2817 /* constraints check */
2818 ret
= regulator_mode_constrain(rdev
, &mode
);
2822 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2824 mutex_unlock(&rdev
->mutex
);
2827 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2829 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2833 mutex_lock(&rdev
->mutex
);
2836 if (!rdev
->desc
->ops
->get_mode
) {
2841 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2843 mutex_unlock(&rdev
->mutex
);
2848 * regulator_get_mode - get regulator operating mode
2849 * @regulator: regulator source
2851 * Get the current regulator operating mode.
2853 unsigned int regulator_get_mode(struct regulator
*regulator
)
2855 return _regulator_get_mode(regulator
->rdev
);
2857 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2860 * regulator_set_optimum_mode - set regulator optimum operating mode
2861 * @regulator: regulator source
2862 * @uA_load: load current
2864 * Notifies the regulator core of a new device load. This is then used by
2865 * DRMS (if enabled by constraints) to set the most efficient regulator
2866 * operating mode for the new regulator loading.
2868 * Consumer devices notify their supply regulator of the maximum power
2869 * they will require (can be taken from device datasheet in the power
2870 * consumption tables) when they change operational status and hence power
2871 * state. Examples of operational state changes that can affect power
2872 * consumption are :-
2874 * o Device is opened / closed.
2875 * o Device I/O is about to begin or has just finished.
2876 * o Device is idling in between work.
2878 * This information is also exported via sysfs to userspace.
2880 * DRMS will sum the total requested load on the regulator and change
2881 * to the most efficient operating mode if platform constraints allow.
2883 * Returns the new regulator mode or error.
2885 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
2887 struct regulator_dev
*rdev
= regulator
->rdev
;
2888 struct regulator
*consumer
;
2889 int ret
, output_uV
, input_uV
= 0, total_uA_load
= 0;
2893 input_uV
= regulator_get_voltage(rdev
->supply
);
2895 mutex_lock(&rdev
->mutex
);
2898 * first check to see if we can set modes at all, otherwise just
2899 * tell the consumer everything is OK.
2901 regulator
->uA_load
= uA_load
;
2902 ret
= regulator_check_drms(rdev
);
2908 if (!rdev
->desc
->ops
->get_optimum_mode
)
2912 * we can actually do this so any errors are indicators of
2913 * potential real failure.
2917 if (!rdev
->desc
->ops
->set_mode
)
2920 /* get output voltage */
2921 output_uV
= _regulator_get_voltage(rdev
);
2922 if (output_uV
<= 0) {
2923 rdev_err(rdev
, "invalid output voltage found\n");
2927 /* No supply? Use constraint voltage */
2929 input_uV
= rdev
->constraints
->input_uV
;
2930 if (input_uV
<= 0) {
2931 rdev_err(rdev
, "invalid input voltage found\n");
2935 /* calc total requested load for this regulator */
2936 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
2937 total_uA_load
+= consumer
->uA_load
;
2939 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
2940 input_uV
, output_uV
,
2942 ret
= regulator_mode_constrain(rdev
, &mode
);
2944 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2945 total_uA_load
, input_uV
, output_uV
);
2949 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2951 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
2956 mutex_unlock(&rdev
->mutex
);
2959 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
2962 * regulator_set_bypass_regmap - Default set_bypass() using regmap
2964 * @rdev: device to operate on.
2965 * @enable: state to set.
2967 int regulator_set_bypass_regmap(struct regulator_dev
*rdev
, bool enable
)
2972 val
= rdev
->desc
->bypass_mask
;
2976 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->bypass_reg
,
2977 rdev
->desc
->bypass_mask
, val
);
2979 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap
);
2982 * regulator_get_bypass_regmap - Default get_bypass() using regmap
2984 * @rdev: device to operate on.
2985 * @enable: current state.
2987 int regulator_get_bypass_regmap(struct regulator_dev
*rdev
, bool *enable
)
2992 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->bypass_reg
, &val
);
2996 *enable
= val
& rdev
->desc
->bypass_mask
;
3000 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap
);
3003 * regulator_allow_bypass - allow the regulator to go into bypass mode
3005 * @regulator: Regulator to configure
3006 * @enable: enable or disable bypass mode
3008 * Allow the regulator to go into bypass mode if all other consumers
3009 * for the regulator also enable bypass mode and the machine
3010 * constraints allow this. Bypass mode means that the regulator is
3011 * simply passing the input directly to the output with no regulation.
3013 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3015 struct regulator_dev
*rdev
= regulator
->rdev
;
3018 if (!rdev
->desc
->ops
->set_bypass
)
3021 if (rdev
->constraints
&&
3022 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
3025 mutex_lock(&rdev
->mutex
);
3027 if (enable
&& !regulator
->bypass
) {
3028 rdev
->bypass_count
++;
3030 if (rdev
->bypass_count
== rdev
->open_count
) {
3031 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3033 rdev
->bypass_count
--;
3036 } else if (!enable
&& regulator
->bypass
) {
3037 rdev
->bypass_count
--;
3039 if (rdev
->bypass_count
!= rdev
->open_count
) {
3040 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3042 rdev
->bypass_count
++;
3047 regulator
->bypass
= enable
;
3049 mutex_unlock(&rdev
->mutex
);
3053 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3056 * regulator_register_notifier - register regulator event notifier
3057 * @regulator: regulator source
3058 * @nb: notifier block
3060 * Register notifier block to receive regulator events.
3062 int regulator_register_notifier(struct regulator
*regulator
,
3063 struct notifier_block
*nb
)
3065 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3068 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3071 * regulator_unregister_notifier - unregister regulator event notifier
3072 * @regulator: regulator source
3073 * @nb: notifier block
3075 * Unregister regulator event notifier block.
3077 int regulator_unregister_notifier(struct regulator
*regulator
,
3078 struct notifier_block
*nb
)
3080 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3083 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3085 /* notify regulator consumers and downstream regulator consumers.
3086 * Note mutex must be held by caller.
3088 static void _notifier_call_chain(struct regulator_dev
*rdev
,
3089 unsigned long event
, void *data
)
3091 /* call rdev chain first */
3092 blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3096 * regulator_bulk_get - get multiple regulator consumers
3098 * @dev: Device to supply
3099 * @num_consumers: Number of consumers to register
3100 * @consumers: Configuration of consumers; clients are stored here.
3102 * @return 0 on success, an errno on failure.
3104 * This helper function allows drivers to get several regulator
3105 * consumers in one operation. If any of the regulators cannot be
3106 * acquired then any regulators that were allocated will be freed
3107 * before returning to the caller.
3109 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3110 struct regulator_bulk_data
*consumers
)
3115 for (i
= 0; i
< num_consumers
; i
++)
3116 consumers
[i
].consumer
= NULL
;
3118 for (i
= 0; i
< num_consumers
; i
++) {
3119 consumers
[i
].consumer
= regulator_get(dev
,
3120 consumers
[i
].supply
);
3121 if (IS_ERR(consumers
[i
].consumer
)) {
3122 ret
= PTR_ERR(consumers
[i
].consumer
);
3123 dev_err(dev
, "Failed to get supply '%s': %d\n",
3124 consumers
[i
].supply
, ret
);
3125 consumers
[i
].consumer
= NULL
;
3134 regulator_put(consumers
[i
].consumer
);
3138 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3141 * devm_regulator_bulk_get - managed get multiple regulator consumers
3143 * @dev: Device to supply
3144 * @num_consumers: Number of consumers to register
3145 * @consumers: Configuration of consumers; clients are stored here.
3147 * @return 0 on success, an errno on failure.
3149 * This helper function allows drivers to get several regulator
3150 * consumers in one operation with management, the regulators will
3151 * automatically be freed when the device is unbound. If any of the
3152 * regulators cannot be acquired then any regulators that were
3153 * allocated will be freed before returning to the caller.
3155 int devm_regulator_bulk_get(struct device
*dev
, int num_consumers
,
3156 struct regulator_bulk_data
*consumers
)
3161 for (i
= 0; i
< num_consumers
; i
++)
3162 consumers
[i
].consumer
= NULL
;
3164 for (i
= 0; i
< num_consumers
; i
++) {
3165 consumers
[i
].consumer
= devm_regulator_get(dev
,
3166 consumers
[i
].supply
);
3167 if (IS_ERR(consumers
[i
].consumer
)) {
3168 ret
= PTR_ERR(consumers
[i
].consumer
);
3169 dev_err(dev
, "Failed to get supply '%s': %d\n",
3170 consumers
[i
].supply
, ret
);
3171 consumers
[i
].consumer
= NULL
;
3179 for (i
= 0; i
< num_consumers
&& consumers
[i
].consumer
; i
++)
3180 devm_regulator_put(consumers
[i
].consumer
);
3184 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get
);
3186 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3188 struct regulator_bulk_data
*bulk
= data
;
3190 bulk
->ret
= regulator_enable(bulk
->consumer
);
3194 * regulator_bulk_enable - enable multiple regulator consumers
3196 * @num_consumers: Number of consumers
3197 * @consumers: Consumer data; clients are stored here.
3198 * @return 0 on success, an errno on failure
3200 * This convenience API allows consumers to enable multiple regulator
3201 * clients in a single API call. If any consumers cannot be enabled
3202 * then any others that were enabled will be disabled again prior to
3205 int regulator_bulk_enable(int num_consumers
,
3206 struct regulator_bulk_data
*consumers
)
3208 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3212 for (i
= 0; i
< num_consumers
; i
++) {
3213 if (consumers
[i
].consumer
->always_on
)
3214 consumers
[i
].ret
= 0;
3216 async_schedule_domain(regulator_bulk_enable_async
,
3217 &consumers
[i
], &async_domain
);
3220 async_synchronize_full_domain(&async_domain
);
3222 /* If any consumer failed we need to unwind any that succeeded */
3223 for (i
= 0; i
< num_consumers
; i
++) {
3224 if (consumers
[i
].ret
!= 0) {
3225 ret
= consumers
[i
].ret
;
3233 for (i
= 0; i
< num_consumers
; i
++) {
3234 if (consumers
[i
].ret
< 0)
3235 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3238 regulator_disable(consumers
[i
].consumer
);
3243 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3246 * regulator_bulk_disable - disable multiple regulator consumers
3248 * @num_consumers: Number of consumers
3249 * @consumers: Consumer data; clients are stored here.
3250 * @return 0 on success, an errno on failure
3252 * This convenience API allows consumers to disable multiple regulator
3253 * clients in a single API call. If any consumers cannot be disabled
3254 * then any others that were disabled will be enabled again prior to
3257 int regulator_bulk_disable(int num_consumers
,
3258 struct regulator_bulk_data
*consumers
)
3263 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3264 ret
= regulator_disable(consumers
[i
].consumer
);
3272 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3273 for (++i
; i
< num_consumers
; ++i
) {
3274 r
= regulator_enable(consumers
[i
].consumer
);
3276 pr_err("Failed to reename %s: %d\n",
3277 consumers
[i
].supply
, r
);
3282 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3285 * regulator_bulk_force_disable - force disable multiple regulator consumers
3287 * @num_consumers: Number of consumers
3288 * @consumers: Consumer data; clients are stored here.
3289 * @return 0 on success, an errno on failure
3291 * This convenience API allows consumers to forcibly disable multiple regulator
3292 * clients in a single API call.
3293 * NOTE: This should be used for situations when device damage will
3294 * likely occur if the regulators are not disabled (e.g. over temp).
3295 * Although regulator_force_disable function call for some consumers can
3296 * return error numbers, the function is called for all consumers.
3298 int regulator_bulk_force_disable(int num_consumers
,
3299 struct regulator_bulk_data
*consumers
)
3304 for (i
= 0; i
< num_consumers
; i
++)
3306 regulator_force_disable(consumers
[i
].consumer
);
3308 for (i
= 0; i
< num_consumers
; i
++) {
3309 if (consumers
[i
].ret
!= 0) {
3310 ret
= consumers
[i
].ret
;
3319 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3322 * regulator_bulk_free - free multiple regulator consumers
3324 * @num_consumers: Number of consumers
3325 * @consumers: Consumer data; clients are stored here.
3327 * This convenience API allows consumers to free multiple regulator
3328 * clients in a single API call.
3330 void regulator_bulk_free(int num_consumers
,
3331 struct regulator_bulk_data
*consumers
)
3335 for (i
= 0; i
< num_consumers
; i
++) {
3336 regulator_put(consumers
[i
].consumer
);
3337 consumers
[i
].consumer
= NULL
;
3340 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3343 * regulator_notifier_call_chain - call regulator event notifier
3344 * @rdev: regulator source
3345 * @event: notifier block
3346 * @data: callback-specific data.
3348 * Called by regulator drivers to notify clients a regulator event has
3349 * occurred. We also notify regulator clients downstream.
3350 * Note lock must be held by caller.
3352 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3353 unsigned long event
, void *data
)
3355 _notifier_call_chain(rdev
, event
, data
);
3359 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3362 * regulator_mode_to_status - convert a regulator mode into a status
3364 * @mode: Mode to convert
3366 * Convert a regulator mode into a status.
3368 int regulator_mode_to_status(unsigned int mode
)
3371 case REGULATOR_MODE_FAST
:
3372 return REGULATOR_STATUS_FAST
;
3373 case REGULATOR_MODE_NORMAL
:
3374 return REGULATOR_STATUS_NORMAL
;
3375 case REGULATOR_MODE_IDLE
:
3376 return REGULATOR_STATUS_IDLE
;
3377 case REGULATOR_MODE_STANDBY
:
3378 return REGULATOR_STATUS_STANDBY
;
3380 return REGULATOR_STATUS_UNDEFINED
;
3383 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3386 * To avoid cluttering sysfs (and memory) with useless state, only
3387 * create attributes that can be meaningfully displayed.
3389 static int add_regulator_attributes(struct regulator_dev
*rdev
)
3391 struct device
*dev
= &rdev
->dev
;
3392 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3395 /* some attributes need specific methods to be displayed */
3396 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3397 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3398 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0)) {
3399 status
= device_create_file(dev
, &dev_attr_microvolts
);
3403 if (ops
->get_current_limit
) {
3404 status
= device_create_file(dev
, &dev_attr_microamps
);
3408 if (ops
->get_mode
) {
3409 status
= device_create_file(dev
, &dev_attr_opmode
);
3413 if (rdev
->ena_pin
|| ops
->is_enabled
) {
3414 status
= device_create_file(dev
, &dev_attr_state
);
3418 if (ops
->get_status
) {
3419 status
= device_create_file(dev
, &dev_attr_status
);
3423 if (ops
->get_bypass
) {
3424 status
= device_create_file(dev
, &dev_attr_bypass
);
3429 /* some attributes are type-specific */
3430 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
3431 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
3436 /* all the other attributes exist to support constraints;
3437 * don't show them if there are no constraints, or if the
3438 * relevant supporting methods are missing.
3440 if (!rdev
->constraints
)
3443 /* constraints need specific supporting methods */
3444 if (ops
->set_voltage
|| ops
->set_voltage_sel
) {
3445 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
3448 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
3452 if (ops
->set_current_limit
) {
3453 status
= device_create_file(dev
, &dev_attr_min_microamps
);
3456 status
= device_create_file(dev
, &dev_attr_max_microamps
);
3461 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
3464 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
3467 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
3471 if (ops
->set_suspend_voltage
) {
3472 status
= device_create_file(dev
,
3473 &dev_attr_suspend_standby_microvolts
);
3476 status
= device_create_file(dev
,
3477 &dev_attr_suspend_mem_microvolts
);
3480 status
= device_create_file(dev
,
3481 &dev_attr_suspend_disk_microvolts
);
3486 if (ops
->set_suspend_mode
) {
3487 status
= device_create_file(dev
,
3488 &dev_attr_suspend_standby_mode
);
3491 status
= device_create_file(dev
,
3492 &dev_attr_suspend_mem_mode
);
3495 status
= device_create_file(dev
,
3496 &dev_attr_suspend_disk_mode
);
3504 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3506 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3507 if (!rdev
->debugfs
) {
3508 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3512 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3514 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3516 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3517 &rdev
->bypass_count
);
3521 * regulator_register - register regulator
3522 * @regulator_desc: regulator to register
3523 * @config: runtime configuration for regulator
3525 * Called by regulator drivers to register a regulator.
3526 * Returns a valid pointer to struct regulator_dev on success
3527 * or an ERR_PTR() on error.
3529 struct regulator_dev
*
3530 regulator_register(const struct regulator_desc
*regulator_desc
,
3531 const struct regulator_config
*config
)
3533 const struct regulation_constraints
*constraints
= NULL
;
3534 const struct regulator_init_data
*init_data
;
3535 static atomic_t regulator_no
= ATOMIC_INIT(0);
3536 struct regulator_dev
*rdev
;
3539 const char *supply
= NULL
;
3541 if (regulator_desc
== NULL
|| config
== NULL
)
3542 return ERR_PTR(-EINVAL
);
3547 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3548 return ERR_PTR(-EINVAL
);
3550 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3551 regulator_desc
->type
!= REGULATOR_CURRENT
)
3552 return ERR_PTR(-EINVAL
);
3554 /* Only one of each should be implemented */
3555 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3556 regulator_desc
->ops
->get_voltage_sel
);
3557 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3558 regulator_desc
->ops
->set_voltage_sel
);
3560 /* If we're using selectors we must implement list_voltage. */
3561 if (regulator_desc
->ops
->get_voltage_sel
&&
3562 !regulator_desc
->ops
->list_voltage
) {
3563 return ERR_PTR(-EINVAL
);
3565 if (regulator_desc
->ops
->set_voltage_sel
&&
3566 !regulator_desc
->ops
->list_voltage
) {
3567 return ERR_PTR(-EINVAL
);
3570 init_data
= config
->init_data
;
3572 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3574 return ERR_PTR(-ENOMEM
);
3576 mutex_lock(®ulator_list_mutex
);
3578 mutex_init(&rdev
->mutex
);
3579 rdev
->reg_data
= config
->driver_data
;
3580 rdev
->owner
= regulator_desc
->owner
;
3581 rdev
->desc
= regulator_desc
;
3583 rdev
->regmap
= config
->regmap
;
3584 else if (dev_get_regmap(dev
, NULL
))
3585 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3586 else if (dev
->parent
)
3587 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3588 INIT_LIST_HEAD(&rdev
->consumer_list
);
3589 INIT_LIST_HEAD(&rdev
->list
);
3590 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3591 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3593 /* preform any regulator specific init */
3594 if (init_data
&& init_data
->regulator_init
) {
3595 ret
= init_data
->regulator_init(rdev
->reg_data
);
3600 /* register with sysfs */
3601 rdev
->dev
.class = ®ulator_class
;
3602 rdev
->dev
.of_node
= config
->of_node
;
3603 rdev
->dev
.parent
= dev
;
3604 dev_set_name(&rdev
->dev
, "regulator.%d",
3605 atomic_inc_return(®ulator_no
) - 1);
3606 ret
= device_register(&rdev
->dev
);
3608 put_device(&rdev
->dev
);
3612 dev_set_drvdata(&rdev
->dev
, rdev
);
3614 if (config
->ena_gpio
&& gpio_is_valid(config
->ena_gpio
)) {
3615 ret
= regulator_ena_gpio_request(rdev
, config
);
3617 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3618 config
->ena_gpio
, ret
);
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 mutex_lock(&rdev
->mutex
);
3788 if (rdev
->use_count
> 0 || rdev
->constraints
->always_on
) {
3789 if (!_regulator_is_enabled(rdev
)) {
3790 error
= _regulator_do_enable(rdev
);
3795 if (!has_full_constraints
)
3797 if (!_regulator_is_enabled(rdev
))
3800 error
= _regulator_do_disable(rdev
);
3805 mutex_unlock(&rdev
->mutex
);
3807 mutex_unlock(®ulator_list_mutex
);
3810 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3813 * regulator_has_full_constraints - the system has fully specified constraints
3815 * Calling this function will cause the regulator API to disable all
3816 * regulators which have a zero use count and don't have an always_on
3817 * constraint in a late_initcall.
3819 * The intention is that this will become the default behaviour in a
3820 * future kernel release so users are encouraged to use this facility
3823 void regulator_has_full_constraints(void)
3825 has_full_constraints
= 1;
3827 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3830 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3832 * Calling this function will cause the regulator API to provide a
3833 * dummy regulator to consumers if no physical regulator is found,
3834 * allowing most consumers to proceed as though a regulator were
3835 * configured. This allows systems such as those with software
3836 * controllable regulators for the CPU core only to be brought up more
3839 void regulator_use_dummy_regulator(void)
3841 board_wants_dummy_regulator
= true;
3843 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator
);
3846 * rdev_get_drvdata - get rdev regulator driver data
3849 * Get rdev regulator driver private data. This call can be used in the
3850 * regulator driver context.
3852 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3854 return rdev
->reg_data
;
3856 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3859 * regulator_get_drvdata - get regulator driver data
3860 * @regulator: regulator
3862 * Get regulator driver private data. This call can be used in the consumer
3863 * driver context when non API regulator specific functions need to be called.
3865 void *regulator_get_drvdata(struct regulator
*regulator
)
3867 return regulator
->rdev
->reg_data
;
3869 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3872 * regulator_set_drvdata - set regulator driver data
3873 * @regulator: regulator
3876 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3878 regulator
->rdev
->reg_data
= data
;
3880 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3883 * regulator_get_id - get regulator ID
3886 int rdev_get_id(struct regulator_dev
*rdev
)
3888 return rdev
->desc
->id
;
3890 EXPORT_SYMBOL_GPL(rdev_get_id
);
3892 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3896 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3898 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3900 return reg_init_data
->driver_data
;
3902 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3904 #ifdef CONFIG_DEBUG_FS
3905 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3906 size_t count
, loff_t
*ppos
)
3908 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3909 ssize_t len
, ret
= 0;
3910 struct regulator_map
*map
;
3915 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3916 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3918 rdev_get_name(map
->regulator
), map
->dev_name
,
3922 if (ret
> PAGE_SIZE
) {
3928 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3936 static const struct file_operations supply_map_fops
= {
3937 #ifdef CONFIG_DEBUG_FS
3938 .read
= supply_map_read_file
,
3939 .llseek
= default_llseek
,
3943 static int __init
regulator_init(void)
3947 ret
= class_register(®ulator_class
);
3949 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3951 pr_warn("regulator: Failed to create debugfs directory\n");
3953 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3956 regulator_dummy_init();
3961 /* init early to allow our consumers to complete system booting */
3962 core_initcall(regulator_init
);
3964 static int __init
regulator_init_complete(void)
3966 struct regulator_dev
*rdev
;
3967 struct regulator_ops
*ops
;
3968 struct regulation_constraints
*c
;
3972 * Since DT doesn't provide an idiomatic mechanism for
3973 * enabling full constraints and since it's much more natural
3974 * with DT to provide them just assume that a DT enabled
3975 * system has full constraints.
3977 if (of_have_populated_dt())
3978 has_full_constraints
= true;
3980 mutex_lock(®ulator_list_mutex
);
3982 /* If we have a full configuration then disable any regulators
3983 * which are not in use or always_on. This will become the
3984 * default behaviour in the future.
3986 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3987 ops
= rdev
->desc
->ops
;
3988 c
= rdev
->constraints
;
3990 if (c
&& c
->always_on
)
3993 mutex_lock(&rdev
->mutex
);
3995 if (rdev
->use_count
)
3998 /* If we can't read the status assume it's on. */
3999 if (ops
->is_enabled
)
4000 enabled
= ops
->is_enabled(rdev
);
4007 if (has_full_constraints
) {
4008 /* We log since this may kill the system if it
4010 rdev_info(rdev
, "disabling\n");
4011 ret
= _regulator_do_disable(rdev
);
4013 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4016 /* The intention is that in future we will
4017 * assume that full constraints are provided
4018 * so warn even if we aren't going to do
4021 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4025 mutex_unlock(&rdev
->mutex
);
4028 mutex_unlock(®ulator_list_mutex
);
4032 late_initcall(regulator_init_complete
);