2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
28 #include <linux/regmap.h>
29 #include <linux/regulator/of_regulator.h>
30 #include <linux/regulator/consumer.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/machine.h>
33 #include <linux/module.h>
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/regulator.h>
40 #define rdev_crit(rdev, fmt, ...) \
41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
42 #define rdev_err(rdev, fmt, ...) \
43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_warn(rdev, fmt, ...) \
45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_info(rdev, fmt, ...) \
47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_dbg(rdev, fmt, ...) \
49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
51 static DEFINE_MUTEX(regulator_list_mutex
);
52 static LIST_HEAD(regulator_list
);
53 static LIST_HEAD(regulator_map_list
);
54 static bool has_full_constraints
;
55 static bool board_wants_dummy_regulator
;
57 static struct dentry
*debugfs_root
;
60 * struct regulator_map
62 * Used to provide symbolic supply names to devices.
64 struct regulator_map
{
65 struct list_head list
;
66 const char *dev_name
; /* The dev_name() for the consumer */
68 struct regulator_dev
*regulator
;
74 * One for each consumer device.
78 struct list_head list
;
79 unsigned int always_on
:1;
80 unsigned int bypass
:1;
85 struct device_attribute dev_attr
;
86 struct regulator_dev
*rdev
;
87 struct dentry
*debugfs
;
90 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
91 static int _regulator_disable(struct regulator_dev
*rdev
);
92 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
93 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
94 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
95 static void _notifier_call_chain(struct regulator_dev
*rdev
,
96 unsigned long event
, void *data
);
97 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
98 int min_uV
, int max_uV
);
99 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
101 const char *supply_name
);
103 static const char *rdev_get_name(struct regulator_dev
*rdev
)
105 if (rdev
->constraints
&& rdev
->constraints
->name
)
106 return rdev
->constraints
->name
;
107 else if (rdev
->desc
->name
)
108 return rdev
->desc
->name
;
114 * of_get_regulator - get a regulator device node based on supply name
115 * @dev: Device pointer for the consumer (of regulator) device
116 * @supply: regulator supply name
118 * Extract the regulator device node corresponding to the supply name.
119 * retruns the device node corresponding to the regulator if found, else
122 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
124 struct device_node
*regnode
= NULL
;
125 char prop_name
[32]; /* 32 is max size of property name */
127 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
129 snprintf(prop_name
, 32, "%s-supply", supply
);
130 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
133 dev_dbg(dev
, "Looking up %s property in node %s failed",
134 prop_name
, dev
->of_node
->full_name
);
140 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
142 if (!rdev
->constraints
)
145 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
151 /* Platform voltage constraint check */
152 static int regulator_check_voltage(struct regulator_dev
*rdev
,
153 int *min_uV
, int *max_uV
)
155 BUG_ON(*min_uV
> *max_uV
);
157 if (!rdev
->constraints
) {
158 rdev_err(rdev
, "no constraints\n");
161 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
162 rdev_err(rdev
, "operation not allowed\n");
166 if (*max_uV
> rdev
->constraints
->max_uV
)
167 *max_uV
= rdev
->constraints
->max_uV
;
168 if (*min_uV
< rdev
->constraints
->min_uV
)
169 *min_uV
= rdev
->constraints
->min_uV
;
171 if (*min_uV
> *max_uV
) {
172 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
180 /* Make sure we select a voltage that suits the needs of all
181 * regulator consumers
183 static int regulator_check_consumers(struct regulator_dev
*rdev
,
184 int *min_uV
, int *max_uV
)
186 struct regulator
*regulator
;
188 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
190 * Assume consumers that didn't say anything are OK
191 * with anything in the constraint range.
193 if (!regulator
->min_uV
&& !regulator
->max_uV
)
196 if (*max_uV
> regulator
->max_uV
)
197 *max_uV
= regulator
->max_uV
;
198 if (*min_uV
< regulator
->min_uV
)
199 *min_uV
= regulator
->min_uV
;
202 if (*min_uV
> *max_uV
)
208 /* current constraint check */
209 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
210 int *min_uA
, int *max_uA
)
212 BUG_ON(*min_uA
> *max_uA
);
214 if (!rdev
->constraints
) {
215 rdev_err(rdev
, "no constraints\n");
218 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
219 rdev_err(rdev
, "operation not allowed\n");
223 if (*max_uA
> rdev
->constraints
->max_uA
)
224 *max_uA
= rdev
->constraints
->max_uA
;
225 if (*min_uA
< rdev
->constraints
->min_uA
)
226 *min_uA
= rdev
->constraints
->min_uA
;
228 if (*min_uA
> *max_uA
) {
229 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
237 /* operating mode constraint check */
238 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
241 case REGULATOR_MODE_FAST
:
242 case REGULATOR_MODE_NORMAL
:
243 case REGULATOR_MODE_IDLE
:
244 case REGULATOR_MODE_STANDBY
:
247 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
251 if (!rdev
->constraints
) {
252 rdev_err(rdev
, "no constraints\n");
255 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
256 rdev_err(rdev
, "operation not allowed\n");
260 /* The modes are bitmasks, the most power hungry modes having
261 * the lowest values. If the requested mode isn't supported
262 * try higher modes. */
264 if (rdev
->constraints
->valid_modes_mask
& *mode
)
272 /* dynamic regulator mode switching constraint check */
273 static int regulator_check_drms(struct regulator_dev
*rdev
)
275 if (!rdev
->constraints
) {
276 rdev_err(rdev
, "no constraints\n");
279 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
280 rdev_err(rdev
, "operation not allowed\n");
286 static ssize_t
regulator_uV_show(struct device
*dev
,
287 struct device_attribute
*attr
, char *buf
)
289 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
292 mutex_lock(&rdev
->mutex
);
293 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
294 mutex_unlock(&rdev
->mutex
);
298 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
300 static ssize_t
regulator_uA_show(struct device
*dev
,
301 struct device_attribute
*attr
, char *buf
)
303 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
305 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
307 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
309 static ssize_t
regulator_name_show(struct device
*dev
,
310 struct device_attribute
*attr
, char *buf
)
312 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
314 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
317 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
320 case REGULATOR_MODE_FAST
:
321 return sprintf(buf
, "fast\n");
322 case REGULATOR_MODE_NORMAL
:
323 return sprintf(buf
, "normal\n");
324 case REGULATOR_MODE_IDLE
:
325 return sprintf(buf
, "idle\n");
326 case REGULATOR_MODE_STANDBY
:
327 return sprintf(buf
, "standby\n");
329 return sprintf(buf
, "unknown\n");
332 static ssize_t
regulator_opmode_show(struct device
*dev
,
333 struct device_attribute
*attr
, char *buf
)
335 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
337 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
339 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
341 static ssize_t
regulator_print_state(char *buf
, int state
)
344 return sprintf(buf
, "enabled\n");
346 return sprintf(buf
, "disabled\n");
348 return sprintf(buf
, "unknown\n");
351 static ssize_t
regulator_state_show(struct device
*dev
,
352 struct device_attribute
*attr
, char *buf
)
354 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
357 mutex_lock(&rdev
->mutex
);
358 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
359 mutex_unlock(&rdev
->mutex
);
363 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
365 static ssize_t
regulator_status_show(struct device
*dev
,
366 struct device_attribute
*attr
, char *buf
)
368 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
372 status
= rdev
->desc
->ops
->get_status(rdev
);
377 case REGULATOR_STATUS_OFF
:
380 case REGULATOR_STATUS_ON
:
383 case REGULATOR_STATUS_ERROR
:
386 case REGULATOR_STATUS_FAST
:
389 case REGULATOR_STATUS_NORMAL
:
392 case REGULATOR_STATUS_IDLE
:
395 case REGULATOR_STATUS_STANDBY
:
398 case REGULATOR_STATUS_BYPASS
:
401 case REGULATOR_STATUS_UNDEFINED
:
408 return sprintf(buf
, "%s\n", label
);
410 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
412 static ssize_t
regulator_min_uA_show(struct device
*dev
,
413 struct device_attribute
*attr
, char *buf
)
415 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
417 if (!rdev
->constraints
)
418 return sprintf(buf
, "constraint not defined\n");
420 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
422 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
424 static ssize_t
regulator_max_uA_show(struct device
*dev
,
425 struct device_attribute
*attr
, char *buf
)
427 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
429 if (!rdev
->constraints
)
430 return sprintf(buf
, "constraint not defined\n");
432 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
434 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
436 static ssize_t
regulator_min_uV_show(struct device
*dev
,
437 struct device_attribute
*attr
, char *buf
)
439 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
441 if (!rdev
->constraints
)
442 return sprintf(buf
, "constraint not defined\n");
444 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
446 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
448 static ssize_t
regulator_max_uV_show(struct device
*dev
,
449 struct device_attribute
*attr
, char *buf
)
451 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
453 if (!rdev
->constraints
)
454 return sprintf(buf
, "constraint not defined\n");
456 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
458 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
460 static ssize_t
regulator_total_uA_show(struct device
*dev
,
461 struct device_attribute
*attr
, char *buf
)
463 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
464 struct regulator
*regulator
;
467 mutex_lock(&rdev
->mutex
);
468 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
469 uA
+= regulator
->uA_load
;
470 mutex_unlock(&rdev
->mutex
);
471 return sprintf(buf
, "%d\n", uA
);
473 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
475 static ssize_t
regulator_num_users_show(struct device
*dev
,
476 struct device_attribute
*attr
, char *buf
)
478 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
479 return sprintf(buf
, "%d\n", rdev
->use_count
);
482 static ssize_t
regulator_type_show(struct device
*dev
,
483 struct device_attribute
*attr
, char *buf
)
485 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
487 switch (rdev
->desc
->type
) {
488 case REGULATOR_VOLTAGE
:
489 return sprintf(buf
, "voltage\n");
490 case REGULATOR_CURRENT
:
491 return sprintf(buf
, "current\n");
493 return sprintf(buf
, "unknown\n");
496 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
497 struct device_attribute
*attr
, char *buf
)
499 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
501 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
503 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
504 regulator_suspend_mem_uV_show
, NULL
);
506 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
507 struct device_attribute
*attr
, char *buf
)
509 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
511 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
513 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
514 regulator_suspend_disk_uV_show
, NULL
);
516 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
517 struct device_attribute
*attr
, char *buf
)
519 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
521 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
523 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
524 regulator_suspend_standby_uV_show
, NULL
);
526 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
527 struct device_attribute
*attr
, char *buf
)
529 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
531 return regulator_print_opmode(buf
,
532 rdev
->constraints
->state_mem
.mode
);
534 static DEVICE_ATTR(suspend_mem_mode
, 0444,
535 regulator_suspend_mem_mode_show
, NULL
);
537 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
538 struct device_attribute
*attr
, char *buf
)
540 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
542 return regulator_print_opmode(buf
,
543 rdev
->constraints
->state_disk
.mode
);
545 static DEVICE_ATTR(suspend_disk_mode
, 0444,
546 regulator_suspend_disk_mode_show
, NULL
);
548 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
549 struct device_attribute
*attr
, char *buf
)
551 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
553 return regulator_print_opmode(buf
,
554 rdev
->constraints
->state_standby
.mode
);
556 static DEVICE_ATTR(suspend_standby_mode
, 0444,
557 regulator_suspend_standby_mode_show
, NULL
);
559 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
560 struct device_attribute
*attr
, char *buf
)
562 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
564 return regulator_print_state(buf
,
565 rdev
->constraints
->state_mem
.enabled
);
567 static DEVICE_ATTR(suspend_mem_state
, 0444,
568 regulator_suspend_mem_state_show
, NULL
);
570 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
571 struct device_attribute
*attr
, char *buf
)
573 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
575 return regulator_print_state(buf
,
576 rdev
->constraints
->state_disk
.enabled
);
578 static DEVICE_ATTR(suspend_disk_state
, 0444,
579 regulator_suspend_disk_state_show
, NULL
);
581 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
582 struct device_attribute
*attr
, char *buf
)
584 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
586 return regulator_print_state(buf
,
587 rdev
->constraints
->state_standby
.enabled
);
589 static DEVICE_ATTR(suspend_standby_state
, 0444,
590 regulator_suspend_standby_state_show
, NULL
);
592 static ssize_t
regulator_bypass_show(struct device
*dev
,
593 struct device_attribute
*attr
, char *buf
)
595 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
600 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
609 return sprintf(buf
, "%s\n", report
);
611 static DEVICE_ATTR(bypass
, 0444,
612 regulator_bypass_show
, NULL
);
615 * These are the only attributes are present for all regulators.
616 * Other attributes are a function of regulator functionality.
618 static struct device_attribute regulator_dev_attrs
[] = {
619 __ATTR(name
, 0444, regulator_name_show
, NULL
),
620 __ATTR(num_users
, 0444, regulator_num_users_show
, NULL
),
621 __ATTR(type
, 0444, regulator_type_show
, NULL
),
625 static void regulator_dev_release(struct device
*dev
)
627 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
631 static struct class regulator_class
= {
633 .dev_release
= regulator_dev_release
,
634 .dev_attrs
= regulator_dev_attrs
,
637 /* Calculate the new optimum regulator operating mode based on the new total
638 * consumer load. All locks held by caller */
639 static void drms_uA_update(struct regulator_dev
*rdev
)
641 struct regulator
*sibling
;
642 int current_uA
= 0, output_uV
, input_uV
, err
;
645 err
= regulator_check_drms(rdev
);
646 if (err
< 0 || !rdev
->desc
->ops
->get_optimum_mode
||
647 (!rdev
->desc
->ops
->get_voltage
&&
648 !rdev
->desc
->ops
->get_voltage_sel
) ||
649 !rdev
->desc
->ops
->set_mode
)
652 /* get output voltage */
653 output_uV
= _regulator_get_voltage(rdev
);
657 /* get input voltage */
660 input_uV
= regulator_get_voltage(rdev
->supply
);
662 input_uV
= rdev
->constraints
->input_uV
;
666 /* calc total requested load */
667 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
668 current_uA
+= sibling
->uA_load
;
670 /* now get the optimum mode for our new total regulator load */
671 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
672 output_uV
, current_uA
);
674 /* check the new mode is allowed */
675 err
= regulator_mode_constrain(rdev
, &mode
);
677 rdev
->desc
->ops
->set_mode(rdev
, mode
);
680 static int suspend_set_state(struct regulator_dev
*rdev
,
681 struct regulator_state
*rstate
)
685 /* If we have no suspend mode configration don't set anything;
686 * only warn if the driver implements set_suspend_voltage or
687 * set_suspend_mode callback.
689 if (!rstate
->enabled
&& !rstate
->disabled
) {
690 if (rdev
->desc
->ops
->set_suspend_voltage
||
691 rdev
->desc
->ops
->set_suspend_mode
)
692 rdev_warn(rdev
, "No configuration\n");
696 if (rstate
->enabled
&& rstate
->disabled
) {
697 rdev_err(rdev
, "invalid configuration\n");
701 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
702 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
703 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
704 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
705 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
709 rdev_err(rdev
, "failed to enabled/disable\n");
713 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
714 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
716 rdev_err(rdev
, "failed to set voltage\n");
721 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
722 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
724 rdev_err(rdev
, "failed to set mode\n");
731 /* locks held by caller */
732 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
734 if (!rdev
->constraints
)
738 case PM_SUSPEND_STANDBY
:
739 return suspend_set_state(rdev
,
740 &rdev
->constraints
->state_standby
);
742 return suspend_set_state(rdev
,
743 &rdev
->constraints
->state_mem
);
745 return suspend_set_state(rdev
,
746 &rdev
->constraints
->state_disk
);
752 static void print_constraints(struct regulator_dev
*rdev
)
754 struct regulation_constraints
*constraints
= rdev
->constraints
;
759 if (constraints
->min_uV
&& constraints
->max_uV
) {
760 if (constraints
->min_uV
== constraints
->max_uV
)
761 count
+= sprintf(buf
+ count
, "%d mV ",
762 constraints
->min_uV
/ 1000);
764 count
+= sprintf(buf
+ count
, "%d <--> %d mV ",
765 constraints
->min_uV
/ 1000,
766 constraints
->max_uV
/ 1000);
769 if (!constraints
->min_uV
||
770 constraints
->min_uV
!= constraints
->max_uV
) {
771 ret
= _regulator_get_voltage(rdev
);
773 count
+= sprintf(buf
+ count
, "at %d mV ", ret
/ 1000);
776 if (constraints
->uV_offset
)
777 count
+= sprintf(buf
, "%dmV offset ",
778 constraints
->uV_offset
/ 1000);
780 if (constraints
->min_uA
&& constraints
->max_uA
) {
781 if (constraints
->min_uA
== constraints
->max_uA
)
782 count
+= sprintf(buf
+ count
, "%d mA ",
783 constraints
->min_uA
/ 1000);
785 count
+= sprintf(buf
+ count
, "%d <--> %d mA ",
786 constraints
->min_uA
/ 1000,
787 constraints
->max_uA
/ 1000);
790 if (!constraints
->min_uA
||
791 constraints
->min_uA
!= constraints
->max_uA
) {
792 ret
= _regulator_get_current_limit(rdev
);
794 count
+= sprintf(buf
+ count
, "at %d mA ", ret
/ 1000);
797 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
798 count
+= sprintf(buf
+ count
, "fast ");
799 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
800 count
+= sprintf(buf
+ count
, "normal ");
801 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
802 count
+= sprintf(buf
+ count
, "idle ");
803 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
804 count
+= sprintf(buf
+ count
, "standby");
807 sprintf(buf
, "no parameters");
809 rdev_info(rdev
, "%s\n", buf
);
811 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
812 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
814 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
817 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
818 struct regulation_constraints
*constraints
)
820 struct regulator_ops
*ops
= rdev
->desc
->ops
;
823 /* do we need to apply the constraint voltage */
824 if (rdev
->constraints
->apply_uV
&&
825 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
826 ret
= _regulator_do_set_voltage(rdev
,
827 rdev
->constraints
->min_uV
,
828 rdev
->constraints
->max_uV
);
830 rdev_err(rdev
, "failed to apply %duV constraint\n",
831 rdev
->constraints
->min_uV
);
836 /* constrain machine-level voltage specs to fit
837 * the actual range supported by this regulator.
839 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
840 int count
= rdev
->desc
->n_voltages
;
842 int min_uV
= INT_MAX
;
843 int max_uV
= INT_MIN
;
844 int cmin
= constraints
->min_uV
;
845 int cmax
= constraints
->max_uV
;
847 /* it's safe to autoconfigure fixed-voltage supplies
848 and the constraints are used by list_voltage. */
849 if (count
== 1 && !cmin
) {
852 constraints
->min_uV
= cmin
;
853 constraints
->max_uV
= cmax
;
856 /* voltage constraints are optional */
857 if ((cmin
== 0) && (cmax
== 0))
860 /* else require explicit machine-level constraints */
861 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
862 rdev_err(rdev
, "invalid voltage constraints\n");
866 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
867 for (i
= 0; i
< count
; i
++) {
870 value
= ops
->list_voltage(rdev
, i
);
874 /* maybe adjust [min_uV..max_uV] */
875 if (value
>= cmin
&& value
< min_uV
)
877 if (value
<= cmax
&& value
> max_uV
)
881 /* final: [min_uV..max_uV] valid iff constraints valid */
882 if (max_uV
< min_uV
) {
883 rdev_err(rdev
, "unsupportable voltage constraints\n");
887 /* use regulator's subset of machine constraints */
888 if (constraints
->min_uV
< min_uV
) {
889 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
890 constraints
->min_uV
, min_uV
);
891 constraints
->min_uV
= min_uV
;
893 if (constraints
->max_uV
> max_uV
) {
894 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
895 constraints
->max_uV
, max_uV
);
896 constraints
->max_uV
= max_uV
;
904 * set_machine_constraints - sets regulator constraints
905 * @rdev: regulator source
906 * @constraints: constraints to apply
908 * Allows platform initialisation code to define and constrain
909 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
910 * Constraints *must* be set by platform code in order for some
911 * regulator operations to proceed i.e. set_voltage, set_current_limit,
914 static int set_machine_constraints(struct regulator_dev
*rdev
,
915 const struct regulation_constraints
*constraints
)
918 struct regulator_ops
*ops
= rdev
->desc
->ops
;
921 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
924 rdev
->constraints
= kzalloc(sizeof(*constraints
),
926 if (!rdev
->constraints
)
929 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
933 /* do we need to setup our suspend state */
934 if (rdev
->constraints
->initial_state
) {
935 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
937 rdev_err(rdev
, "failed to set suspend state\n");
942 if (rdev
->constraints
->initial_mode
) {
943 if (!ops
->set_mode
) {
944 rdev_err(rdev
, "no set_mode operation\n");
949 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
951 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
956 /* If the constraints say the regulator should be on at this point
957 * and we have control then make sure it is enabled.
959 if ((rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) &&
961 ret
= ops
->enable(rdev
);
963 rdev_err(rdev
, "failed to enable\n");
968 if (rdev
->constraints
->ramp_delay
&& ops
->set_ramp_delay
) {
969 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
971 rdev_err(rdev
, "failed to set ramp_delay\n");
976 print_constraints(rdev
);
979 kfree(rdev
->constraints
);
980 rdev
->constraints
= NULL
;
985 * set_supply - set regulator supply regulator
986 * @rdev: regulator name
987 * @supply_rdev: supply regulator name
989 * Called by platform initialisation code to set the supply regulator for this
990 * regulator. This ensures that a regulators supply will also be enabled by the
991 * core if it's child is enabled.
993 static int set_supply(struct regulator_dev
*rdev
,
994 struct regulator_dev
*supply_rdev
)
998 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1000 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1001 if (rdev
->supply
== NULL
) {
1005 supply_rdev
->open_count
++;
1011 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1012 * @rdev: regulator source
1013 * @consumer_dev_name: dev_name() string for device supply applies to
1014 * @supply: symbolic name for supply
1016 * Allows platform initialisation code to map physical regulator
1017 * sources to symbolic names for supplies for use by devices. Devices
1018 * should use these symbolic names to request regulators, avoiding the
1019 * need to provide board-specific regulator names as platform data.
1021 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1022 const char *consumer_dev_name
,
1025 struct regulator_map
*node
;
1031 if (consumer_dev_name
!= NULL
)
1036 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1037 if (node
->dev_name
&& consumer_dev_name
) {
1038 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1040 } else if (node
->dev_name
|| consumer_dev_name
) {
1044 if (strcmp(node
->supply
, supply
) != 0)
1047 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1049 dev_name(&node
->regulator
->dev
),
1050 node
->regulator
->desc
->name
,
1052 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1056 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1060 node
->regulator
= rdev
;
1061 node
->supply
= supply
;
1064 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1065 if (node
->dev_name
== NULL
) {
1071 list_add(&node
->list
, ®ulator_map_list
);
1075 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1077 struct regulator_map
*node
, *n
;
1079 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1080 if (rdev
== node
->regulator
) {
1081 list_del(&node
->list
);
1082 kfree(node
->dev_name
);
1088 #define REG_STR_SIZE 64
1090 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1092 const char *supply_name
)
1094 struct regulator
*regulator
;
1095 char buf
[REG_STR_SIZE
];
1098 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1099 if (regulator
== NULL
)
1102 mutex_lock(&rdev
->mutex
);
1103 regulator
->rdev
= rdev
;
1104 list_add(®ulator
->list
, &rdev
->consumer_list
);
1107 regulator
->dev
= dev
;
1109 /* Add a link to the device sysfs entry */
1110 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1111 dev
->kobj
.name
, supply_name
);
1112 if (size
>= REG_STR_SIZE
)
1115 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1116 if (regulator
->supply_name
== NULL
)
1119 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1122 rdev_warn(rdev
, "could not add device link %s err %d\n",
1123 dev
->kobj
.name
, err
);
1127 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1128 if (regulator
->supply_name
== NULL
)
1132 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1134 if (!regulator
->debugfs
) {
1135 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1137 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1138 ®ulator
->uA_load
);
1139 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1140 ®ulator
->min_uV
);
1141 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1142 ®ulator
->max_uV
);
1146 * Check now if the regulator is an always on regulator - if
1147 * it is then we don't need to do nearly so much work for
1148 * enable/disable calls.
1150 if (!_regulator_can_change_status(rdev
) &&
1151 _regulator_is_enabled(rdev
))
1152 regulator
->always_on
= true;
1154 mutex_unlock(&rdev
->mutex
);
1157 list_del(®ulator
->list
);
1159 mutex_unlock(&rdev
->mutex
);
1163 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1165 if (!rdev
->desc
->ops
->enable_time
)
1166 return rdev
->desc
->enable_time
;
1167 return rdev
->desc
->ops
->enable_time(rdev
);
1170 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1174 struct regulator_dev
*r
;
1175 struct device_node
*node
;
1176 struct regulator_map
*map
;
1177 const char *devname
= NULL
;
1179 /* first do a dt based lookup */
1180 if (dev
&& dev
->of_node
) {
1181 node
= of_get_regulator(dev
, supply
);
1183 list_for_each_entry(r
, ®ulator_list
, list
)
1184 if (r
->dev
.parent
&&
1185 node
== r
->dev
.of_node
)
1189 * If we couldn't even get the node then it's
1190 * not just that the device didn't register
1191 * yet, there's no node and we'll never
1198 /* if not found, try doing it non-dt way */
1200 devname
= dev_name(dev
);
1202 list_for_each_entry(r
, ®ulator_list
, list
)
1203 if (strcmp(rdev_get_name(r
), supply
) == 0)
1206 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1207 /* If the mapping has a device set up it must match */
1208 if (map
->dev_name
&&
1209 (!devname
|| strcmp(map
->dev_name
, devname
)))
1212 if (strcmp(map
->supply
, supply
) == 0)
1213 return map
->regulator
;
1220 /* Internal regulator request function */
1221 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1224 struct regulator_dev
*rdev
;
1225 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1226 const char *devname
= NULL
;
1230 pr_err("get() with no identifier\n");
1235 devname
= dev_name(dev
);
1237 mutex_lock(®ulator_list_mutex
);
1239 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1243 if (board_wants_dummy_regulator
) {
1244 rdev
= dummy_regulator_rdev
;
1248 #ifdef CONFIG_REGULATOR_DUMMY
1250 devname
= "deviceless";
1252 /* If the board didn't flag that it was fully constrained then
1253 * substitute in a dummy regulator so consumers can continue.
1255 if (!has_full_constraints
) {
1256 pr_warn("%s supply %s not found, using dummy regulator\n",
1258 rdev
= dummy_regulator_rdev
;
1263 mutex_unlock(®ulator_list_mutex
);
1267 if (rdev
->exclusive
) {
1268 regulator
= ERR_PTR(-EPERM
);
1272 if (exclusive
&& rdev
->open_count
) {
1273 regulator
= ERR_PTR(-EBUSY
);
1277 if (!try_module_get(rdev
->owner
))
1280 regulator
= create_regulator(rdev
, dev
, id
);
1281 if (regulator
== NULL
) {
1282 regulator
= ERR_PTR(-ENOMEM
);
1283 module_put(rdev
->owner
);
1289 rdev
->exclusive
= 1;
1291 ret
= _regulator_is_enabled(rdev
);
1293 rdev
->use_count
= 1;
1295 rdev
->use_count
= 0;
1299 mutex_unlock(®ulator_list_mutex
);
1305 * regulator_get - lookup and obtain a reference to a regulator.
1306 * @dev: device for regulator "consumer"
1307 * @id: Supply name or regulator ID.
1309 * Returns a struct regulator corresponding to the regulator producer,
1310 * or IS_ERR() condition containing errno.
1312 * Use of supply names configured via regulator_set_device_supply() is
1313 * strongly encouraged. It is recommended that the supply name used
1314 * should match the name used for the supply and/or the relevant
1315 * device pins in the datasheet.
1317 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1319 return _regulator_get(dev
, id
, 0);
1321 EXPORT_SYMBOL_GPL(regulator_get
);
1323 static void devm_regulator_release(struct device
*dev
, void *res
)
1325 regulator_put(*(struct regulator
**)res
);
1329 * devm_regulator_get - Resource managed regulator_get()
1330 * @dev: device for regulator "consumer"
1331 * @id: Supply name or regulator ID.
1333 * Managed regulator_get(). Regulators returned from this function are
1334 * automatically regulator_put() on driver detach. See regulator_get() for more
1337 struct regulator
*devm_regulator_get(struct device
*dev
, const char *id
)
1339 struct regulator
**ptr
, *regulator
;
1341 ptr
= devres_alloc(devm_regulator_release
, sizeof(*ptr
), GFP_KERNEL
);
1343 return ERR_PTR(-ENOMEM
);
1345 regulator
= regulator_get(dev
, id
);
1346 if (!IS_ERR(regulator
)) {
1348 devres_add(dev
, ptr
);
1355 EXPORT_SYMBOL_GPL(devm_regulator_get
);
1358 * regulator_get_exclusive - obtain exclusive access to a regulator.
1359 * @dev: device for regulator "consumer"
1360 * @id: Supply name or regulator ID.
1362 * Returns a struct regulator corresponding to the regulator producer,
1363 * or IS_ERR() condition containing errno. Other consumers will be
1364 * unable to obtain this reference is held and the use count for the
1365 * regulator will be initialised to reflect the current state of the
1368 * This is intended for use by consumers which cannot tolerate shared
1369 * use of the regulator such as those which need to force the
1370 * regulator off for correct operation of the hardware they are
1373 * Use of supply names configured via regulator_set_device_supply() is
1374 * strongly encouraged. It is recommended that the supply name used
1375 * should match the name used for the supply and/or the relevant
1376 * device pins in the datasheet.
1378 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1380 return _regulator_get(dev
, id
, 1);
1382 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1385 * regulator_put - "free" the regulator source
1386 * @regulator: regulator source
1388 * Note: drivers must ensure that all regulator_enable calls made on this
1389 * regulator source are balanced by regulator_disable calls prior to calling
1392 void regulator_put(struct regulator
*regulator
)
1394 struct regulator_dev
*rdev
;
1396 if (regulator
== NULL
|| IS_ERR(regulator
))
1399 mutex_lock(®ulator_list_mutex
);
1400 rdev
= regulator
->rdev
;
1402 debugfs_remove_recursive(regulator
->debugfs
);
1404 /* remove any sysfs entries */
1406 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1407 kfree(regulator
->supply_name
);
1408 list_del(®ulator
->list
);
1412 rdev
->exclusive
= 0;
1414 module_put(rdev
->owner
);
1415 mutex_unlock(®ulator_list_mutex
);
1417 EXPORT_SYMBOL_GPL(regulator_put
);
1419 static int devm_regulator_match(struct device
*dev
, void *res
, void *data
)
1421 struct regulator
**r
= res
;
1430 * devm_regulator_put - Resource managed regulator_put()
1431 * @regulator: regulator to free
1433 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1434 * this function will not need to be called and the resource management
1435 * code will ensure that the resource is freed.
1437 void devm_regulator_put(struct regulator
*regulator
)
1441 rc
= devres_release(regulator
->dev
, devm_regulator_release
,
1442 devm_regulator_match
, regulator
);
1446 EXPORT_SYMBOL_GPL(devm_regulator_put
);
1448 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1452 /* Query before enabling in case configuration dependent. */
1453 ret
= _regulator_get_enable_time(rdev
);
1457 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1461 trace_regulator_enable(rdev_get_name(rdev
));
1463 if (rdev
->ena_gpio
) {
1464 gpio_set_value_cansleep(rdev
->ena_gpio
,
1465 !rdev
->ena_gpio_invert
);
1466 rdev
->ena_gpio_state
= 1;
1467 } else if (rdev
->desc
->ops
->enable
) {
1468 ret
= rdev
->desc
->ops
->enable(rdev
);
1475 /* Allow the regulator to ramp; it would be useful to extend
1476 * this for bulk operations so that the regulators can ramp
1478 trace_regulator_enable_delay(rdev_get_name(rdev
));
1480 if (delay
>= 1000) {
1481 mdelay(delay
/ 1000);
1482 udelay(delay
% 1000);
1487 trace_regulator_enable_complete(rdev_get_name(rdev
));
1492 /* locks held by regulator_enable() */
1493 static int _regulator_enable(struct regulator_dev
*rdev
)
1497 /* check voltage and requested load before enabling */
1498 if (rdev
->constraints
&&
1499 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1500 drms_uA_update(rdev
);
1502 if (rdev
->use_count
== 0) {
1503 /* The regulator may on if it's not switchable or left on */
1504 ret
= _regulator_is_enabled(rdev
);
1505 if (ret
== -EINVAL
|| ret
== 0) {
1506 if (!_regulator_can_change_status(rdev
))
1509 ret
= _regulator_do_enable(rdev
);
1513 } else if (ret
< 0) {
1514 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1517 /* Fallthrough on positive return values - already enabled */
1526 * regulator_enable - enable regulator output
1527 * @regulator: regulator source
1529 * Request that the regulator be enabled with the regulator output at
1530 * the predefined voltage or current value. Calls to regulator_enable()
1531 * must be balanced with calls to regulator_disable().
1533 * NOTE: the output value can be set by other drivers, boot loader or may be
1534 * hardwired in the regulator.
1536 int regulator_enable(struct regulator
*regulator
)
1538 struct regulator_dev
*rdev
= regulator
->rdev
;
1541 if (regulator
->always_on
)
1545 ret
= regulator_enable(rdev
->supply
);
1550 mutex_lock(&rdev
->mutex
);
1551 ret
= _regulator_enable(rdev
);
1552 mutex_unlock(&rdev
->mutex
);
1554 if (ret
!= 0 && rdev
->supply
)
1555 regulator_disable(rdev
->supply
);
1559 EXPORT_SYMBOL_GPL(regulator_enable
);
1561 static int _regulator_do_disable(struct regulator_dev
*rdev
)
1565 trace_regulator_disable(rdev_get_name(rdev
));
1567 if (rdev
->ena_gpio
) {
1568 gpio_set_value_cansleep(rdev
->ena_gpio
,
1569 rdev
->ena_gpio_invert
);
1570 rdev
->ena_gpio_state
= 0;
1572 } else if (rdev
->desc
->ops
->disable
) {
1573 ret
= rdev
->desc
->ops
->disable(rdev
);
1578 trace_regulator_disable_complete(rdev_get_name(rdev
));
1580 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1585 /* locks held by regulator_disable() */
1586 static int _regulator_disable(struct regulator_dev
*rdev
)
1590 if (WARN(rdev
->use_count
<= 0,
1591 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1594 /* are we the last user and permitted to disable ? */
1595 if (rdev
->use_count
== 1 &&
1596 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1598 /* we are last user */
1599 if (_regulator_can_change_status(rdev
)) {
1600 ret
= _regulator_do_disable(rdev
);
1602 rdev_err(rdev
, "failed to disable\n");
1607 rdev
->use_count
= 0;
1608 } else if (rdev
->use_count
> 1) {
1610 if (rdev
->constraints
&&
1611 (rdev
->constraints
->valid_ops_mask
&
1612 REGULATOR_CHANGE_DRMS
))
1613 drms_uA_update(rdev
);
1622 * regulator_disable - disable regulator output
1623 * @regulator: regulator source
1625 * Disable the regulator output voltage or current. Calls to
1626 * regulator_enable() must be balanced with calls to
1627 * regulator_disable().
1629 * NOTE: this will only disable the regulator output if no other consumer
1630 * devices have it enabled, the regulator device supports disabling and
1631 * machine constraints permit this operation.
1633 int regulator_disable(struct regulator
*regulator
)
1635 struct regulator_dev
*rdev
= regulator
->rdev
;
1638 if (regulator
->always_on
)
1641 mutex_lock(&rdev
->mutex
);
1642 ret
= _regulator_disable(rdev
);
1643 mutex_unlock(&rdev
->mutex
);
1645 if (ret
== 0 && rdev
->supply
)
1646 regulator_disable(rdev
->supply
);
1650 EXPORT_SYMBOL_GPL(regulator_disable
);
1652 /* locks held by regulator_force_disable() */
1653 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1658 if (rdev
->desc
->ops
->disable
) {
1659 /* ah well, who wants to live forever... */
1660 ret
= rdev
->desc
->ops
->disable(rdev
);
1662 rdev_err(rdev
, "failed to force disable\n");
1665 /* notify other consumers that power has been forced off */
1666 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1667 REGULATOR_EVENT_DISABLE
, NULL
);
1674 * regulator_force_disable - force disable regulator output
1675 * @regulator: regulator source
1677 * Forcibly disable the regulator output voltage or current.
1678 * NOTE: this *will* disable the regulator output even if other consumer
1679 * devices have it enabled. This should be used for situations when device
1680 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1682 int regulator_force_disable(struct regulator
*regulator
)
1684 struct regulator_dev
*rdev
= regulator
->rdev
;
1687 mutex_lock(&rdev
->mutex
);
1688 regulator
->uA_load
= 0;
1689 ret
= _regulator_force_disable(regulator
->rdev
);
1690 mutex_unlock(&rdev
->mutex
);
1693 while (rdev
->open_count
--)
1694 regulator_disable(rdev
->supply
);
1698 EXPORT_SYMBOL_GPL(regulator_force_disable
);
1700 static void regulator_disable_work(struct work_struct
*work
)
1702 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
1706 mutex_lock(&rdev
->mutex
);
1708 BUG_ON(!rdev
->deferred_disables
);
1710 count
= rdev
->deferred_disables
;
1711 rdev
->deferred_disables
= 0;
1713 for (i
= 0; i
< count
; i
++) {
1714 ret
= _regulator_disable(rdev
);
1716 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
1719 mutex_unlock(&rdev
->mutex
);
1722 for (i
= 0; i
< count
; i
++) {
1723 ret
= regulator_disable(rdev
->supply
);
1726 "Supply disable failed: %d\n", ret
);
1733 * regulator_disable_deferred - disable regulator output with delay
1734 * @regulator: regulator source
1735 * @ms: miliseconds until the regulator is disabled
1737 * Execute regulator_disable() on the regulator after a delay. This
1738 * is intended for use with devices that require some time to quiesce.
1740 * NOTE: this will only disable the regulator output if no other consumer
1741 * devices have it enabled, the regulator device supports disabling and
1742 * machine constraints permit this operation.
1744 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
1746 struct regulator_dev
*rdev
= regulator
->rdev
;
1749 if (regulator
->always_on
)
1753 return regulator_disable(regulator
);
1755 mutex_lock(&rdev
->mutex
);
1756 rdev
->deferred_disables
++;
1757 mutex_unlock(&rdev
->mutex
);
1759 ret
= schedule_delayed_work(&rdev
->disable_work
,
1760 msecs_to_jiffies(ms
));
1766 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
1769 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1771 * @rdev: regulator to operate on
1773 * Regulators that use regmap for their register I/O can set the
1774 * enable_reg and enable_mask fields in their descriptor and then use
1775 * this as their is_enabled operation, saving some code.
1777 int regulator_is_enabled_regmap(struct regulator_dev
*rdev
)
1782 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->enable_reg
, &val
);
1786 return (val
& rdev
->desc
->enable_mask
) != 0;
1788 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap
);
1791 * regulator_enable_regmap - standard enable() for regmap users
1793 * @rdev: regulator to operate on
1795 * Regulators that use regmap for their register I/O can set the
1796 * enable_reg and enable_mask fields in their descriptor and then use
1797 * this as their enable() operation, saving some code.
1799 int regulator_enable_regmap(struct regulator_dev
*rdev
)
1801 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1802 rdev
->desc
->enable_mask
,
1803 rdev
->desc
->enable_mask
);
1805 EXPORT_SYMBOL_GPL(regulator_enable_regmap
);
1808 * regulator_disable_regmap - standard disable() for regmap users
1810 * @rdev: regulator to operate on
1812 * Regulators that use regmap for their register I/O can set the
1813 * enable_reg and enable_mask fields in their descriptor and then use
1814 * this as their disable() operation, saving some code.
1816 int regulator_disable_regmap(struct regulator_dev
*rdev
)
1818 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1819 rdev
->desc
->enable_mask
, 0);
1821 EXPORT_SYMBOL_GPL(regulator_disable_regmap
);
1823 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
1825 /* A GPIO control always takes precedence */
1827 return rdev
->ena_gpio_state
;
1829 /* If we don't know then assume that the regulator is always on */
1830 if (!rdev
->desc
->ops
->is_enabled
)
1833 return rdev
->desc
->ops
->is_enabled(rdev
);
1837 * regulator_is_enabled - is the regulator output enabled
1838 * @regulator: regulator source
1840 * Returns positive if the regulator driver backing the source/client
1841 * has requested that the device be enabled, zero if it hasn't, else a
1842 * negative errno code.
1844 * Note that the device backing this regulator handle can have multiple
1845 * users, so it might be enabled even if regulator_enable() was never
1846 * called for this particular source.
1848 int regulator_is_enabled(struct regulator
*regulator
)
1852 if (regulator
->always_on
)
1855 mutex_lock(®ulator
->rdev
->mutex
);
1856 ret
= _regulator_is_enabled(regulator
->rdev
);
1857 mutex_unlock(®ulator
->rdev
->mutex
);
1861 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
1864 * regulator_count_voltages - count regulator_list_voltage() selectors
1865 * @regulator: regulator source
1867 * Returns number of selectors, or negative errno. Selectors are
1868 * numbered starting at zero, and typically correspond to bitfields
1869 * in hardware registers.
1871 int regulator_count_voltages(struct regulator
*regulator
)
1873 struct regulator_dev
*rdev
= regulator
->rdev
;
1875 return rdev
->desc
->n_voltages
? : -EINVAL
;
1877 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
1880 * regulator_list_voltage_linear - List voltages with simple calculation
1882 * @rdev: Regulator device
1883 * @selector: Selector to convert into a voltage
1885 * Regulators with a simple linear mapping between voltages and
1886 * selectors can set min_uV and uV_step in the regulator descriptor
1887 * and then use this function as their list_voltage() operation,
1889 int regulator_list_voltage_linear(struct regulator_dev
*rdev
,
1890 unsigned int selector
)
1892 if (selector
>= rdev
->desc
->n_voltages
)
1895 return rdev
->desc
->min_uV
+ (rdev
->desc
->uV_step
* selector
);
1897 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear
);
1900 * regulator_list_voltage_table - List voltages with table based mapping
1902 * @rdev: Regulator device
1903 * @selector: Selector to convert into a voltage
1905 * Regulators with table based mapping between voltages and
1906 * selectors can set volt_table in the regulator descriptor
1907 * and then use this function as their list_voltage() operation.
1909 int regulator_list_voltage_table(struct regulator_dev
*rdev
,
1910 unsigned int selector
)
1912 if (!rdev
->desc
->volt_table
) {
1913 BUG_ON(!rdev
->desc
->volt_table
);
1917 if (selector
>= rdev
->desc
->n_voltages
)
1920 return rdev
->desc
->volt_table
[selector
];
1922 EXPORT_SYMBOL_GPL(regulator_list_voltage_table
);
1925 * regulator_list_voltage - enumerate supported voltages
1926 * @regulator: regulator source
1927 * @selector: identify voltage to list
1928 * Context: can sleep
1930 * Returns a voltage that can be passed to @regulator_set_voltage(),
1931 * zero if this selector code can't be used on this system, or a
1934 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
1936 struct regulator_dev
*rdev
= regulator
->rdev
;
1937 struct regulator_ops
*ops
= rdev
->desc
->ops
;
1940 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
1943 mutex_lock(&rdev
->mutex
);
1944 ret
= ops
->list_voltage(rdev
, selector
);
1945 mutex_unlock(&rdev
->mutex
);
1948 if (ret
< rdev
->constraints
->min_uV
)
1950 else if (ret
> rdev
->constraints
->max_uV
)
1956 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
1959 * regulator_is_supported_voltage - check if a voltage range can be supported
1961 * @regulator: Regulator to check.
1962 * @min_uV: Minimum required voltage in uV.
1963 * @max_uV: Maximum required voltage in uV.
1965 * Returns a boolean or a negative error code.
1967 int regulator_is_supported_voltage(struct regulator
*regulator
,
1968 int min_uV
, int max_uV
)
1970 struct regulator_dev
*rdev
= regulator
->rdev
;
1971 int i
, voltages
, ret
;
1973 /* If we can't change voltage check the current voltage */
1974 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
1975 ret
= regulator_get_voltage(regulator
);
1977 return (min_uV
>= ret
&& ret
<= max_uV
);
1982 ret
= regulator_count_voltages(regulator
);
1987 for (i
= 0; i
< voltages
; i
++) {
1988 ret
= regulator_list_voltage(regulator
, i
);
1990 if (ret
>= min_uV
&& ret
<= max_uV
)
1996 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
1999 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2001 * @rdev: regulator to operate on
2003 * Regulators that use regmap for their register I/O can set the
2004 * vsel_reg and vsel_mask fields in their descriptor and then use this
2005 * as their get_voltage_vsel operation, saving some code.
2007 int regulator_get_voltage_sel_regmap(struct regulator_dev
*rdev
)
2012 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->vsel_reg
, &val
);
2016 val
&= rdev
->desc
->vsel_mask
;
2017 val
>>= ffs(rdev
->desc
->vsel_mask
) - 1;
2021 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap
);
2024 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2026 * @rdev: regulator to operate on
2027 * @sel: Selector to set
2029 * Regulators that use regmap for their register I/O can set the
2030 * vsel_reg and vsel_mask fields in their descriptor and then use this
2031 * as their set_voltage_vsel operation, saving some code.
2033 int regulator_set_voltage_sel_regmap(struct regulator_dev
*rdev
, unsigned sel
)
2035 sel
<<= ffs(rdev
->desc
->vsel_mask
) - 1;
2037 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->vsel_reg
,
2038 rdev
->desc
->vsel_mask
, sel
);
2040 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap
);
2043 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2045 * @rdev: Regulator to operate on
2046 * @min_uV: Lower bound for voltage
2047 * @max_uV: Upper bound for voltage
2049 * Drivers implementing set_voltage_sel() and list_voltage() can use
2050 * this as their map_voltage() operation. It will find a suitable
2051 * voltage by calling list_voltage() until it gets something in bounds
2052 * for the requested voltages.
2054 int regulator_map_voltage_iterate(struct regulator_dev
*rdev
,
2055 int min_uV
, int max_uV
)
2057 int best_val
= INT_MAX
;
2061 /* Find the smallest voltage that falls within the specified
2064 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2065 ret
= rdev
->desc
->ops
->list_voltage(rdev
, i
);
2069 if (ret
< best_val
&& ret
>= min_uV
&& ret
<= max_uV
) {
2075 if (best_val
!= INT_MAX
)
2080 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate
);
2083 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2085 * @rdev: Regulator to operate on
2086 * @min_uV: Lower bound for voltage
2087 * @max_uV: Upper bound for voltage
2089 * Drivers providing min_uV and uV_step in their regulator_desc can
2090 * use this as their map_voltage() operation.
2092 int regulator_map_voltage_linear(struct regulator_dev
*rdev
,
2093 int min_uV
, int max_uV
)
2097 /* Allow uV_step to be 0 for fixed voltage */
2098 if (rdev
->desc
->n_voltages
== 1 && rdev
->desc
->uV_step
== 0) {
2099 if (min_uV
<= rdev
->desc
->min_uV
&& rdev
->desc
->min_uV
<= max_uV
)
2105 if (!rdev
->desc
->uV_step
) {
2106 BUG_ON(!rdev
->desc
->uV_step
);
2110 if (min_uV
< rdev
->desc
->min_uV
)
2111 min_uV
= rdev
->desc
->min_uV
;
2113 ret
= DIV_ROUND_UP(min_uV
- rdev
->desc
->min_uV
, rdev
->desc
->uV_step
);
2117 /* Map back into a voltage to verify we're still in bounds */
2118 voltage
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2119 if (voltage
< min_uV
|| voltage
> max_uV
)
2124 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear
);
2126 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2127 int min_uV
, int max_uV
)
2132 unsigned int selector
;
2133 int old_selector
= -1;
2135 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2137 min_uV
+= rdev
->constraints
->uV_offset
;
2138 max_uV
+= rdev
->constraints
->uV_offset
;
2141 * If we can't obtain the old selector there is not enough
2142 * info to call set_voltage_time_sel().
2144 if (_regulator_is_enabled(rdev
) &&
2145 rdev
->desc
->ops
->set_voltage_time_sel
&&
2146 rdev
->desc
->ops
->get_voltage_sel
) {
2147 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2148 if (old_selector
< 0)
2149 return old_selector
;
2152 if (rdev
->desc
->ops
->set_voltage
) {
2153 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
,
2157 if (rdev
->desc
->ops
->list_voltage
)
2158 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2161 best_val
= _regulator_get_voltage(rdev
);
2164 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2165 if (rdev
->desc
->ops
->map_voltage
) {
2166 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2169 if (rdev
->desc
->ops
->list_voltage
==
2170 regulator_list_voltage_linear
)
2171 ret
= regulator_map_voltage_linear(rdev
,
2174 ret
= regulator_map_voltage_iterate(rdev
,
2179 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2180 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2182 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
,
2192 /* Call set_voltage_time_sel if successfully obtained old_selector */
2193 if (ret
== 0 && _regulator_is_enabled(rdev
) && old_selector
>= 0 &&
2194 rdev
->desc
->ops
->set_voltage_time_sel
) {
2196 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2197 old_selector
, selector
);
2199 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2204 /* Insert any necessary delays */
2205 if (delay
>= 1000) {
2206 mdelay(delay
/ 1000);
2207 udelay(delay
% 1000);
2213 if (ret
== 0 && best_val
>= 0) {
2214 unsigned long data
= best_val
;
2216 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2220 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2226 * regulator_set_voltage - set regulator output voltage
2227 * @regulator: regulator source
2228 * @min_uV: Minimum required voltage in uV
2229 * @max_uV: Maximum acceptable voltage in uV
2231 * Sets a voltage regulator to the desired output voltage. This can be set
2232 * during any regulator state. IOW, regulator can be disabled or enabled.
2234 * If the regulator is enabled then the voltage will change to the new value
2235 * immediately otherwise if the regulator is disabled the regulator will
2236 * output at the new voltage when enabled.
2238 * NOTE: If the regulator is shared between several devices then the lowest
2239 * request voltage that meets the system constraints will be used.
2240 * Regulator system constraints must be set for this regulator before
2241 * calling this function otherwise this call will fail.
2243 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2245 struct regulator_dev
*rdev
= regulator
->rdev
;
2248 mutex_lock(&rdev
->mutex
);
2250 /* If we're setting the same range as last time the change
2251 * should be a noop (some cpufreq implementations use the same
2252 * voltage for multiple frequencies, for example).
2254 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2258 if (!rdev
->desc
->ops
->set_voltage
&&
2259 !rdev
->desc
->ops
->set_voltage_sel
) {
2264 /* constraints check */
2265 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2268 regulator
->min_uV
= min_uV
;
2269 regulator
->max_uV
= max_uV
;
2271 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2275 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2278 mutex_unlock(&rdev
->mutex
);
2281 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2284 * regulator_set_voltage_time - get raise/fall time
2285 * @regulator: regulator source
2286 * @old_uV: starting voltage in microvolts
2287 * @new_uV: target voltage in microvolts
2289 * Provided with the starting and ending voltage, this function attempts to
2290 * calculate the time in microseconds required to rise or fall to this new
2293 int regulator_set_voltage_time(struct regulator
*regulator
,
2294 int old_uV
, int new_uV
)
2296 struct regulator_dev
*rdev
= regulator
->rdev
;
2297 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2303 /* Currently requires operations to do this */
2304 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2305 || !rdev
->desc
->n_voltages
)
2308 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2309 /* We only look for exact voltage matches here */
2310 voltage
= regulator_list_voltage(regulator
, i
);
2315 if (voltage
== old_uV
)
2317 if (voltage
== new_uV
)
2321 if (old_sel
< 0 || new_sel
< 0)
2324 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2326 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2329 * regulator_set_voltage_time_sel - get raise/fall time
2330 * @rdev: regulator source device
2331 * @old_selector: selector for starting voltage
2332 * @new_selector: selector for target voltage
2334 * Provided with the starting and target voltage selectors, this function
2335 * returns time in microseconds required to rise or fall to this new voltage
2337 * Drivers providing ramp_delay in regulation_constraints can use this as their
2338 * set_voltage_time_sel() operation.
2340 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2341 unsigned int old_selector
,
2342 unsigned int new_selector
)
2344 unsigned int ramp_delay
= 0;
2345 int old_volt
, new_volt
;
2347 if (rdev
->constraints
->ramp_delay
)
2348 ramp_delay
= rdev
->constraints
->ramp_delay
;
2349 else if (rdev
->desc
->ramp_delay
)
2350 ramp_delay
= rdev
->desc
->ramp_delay
;
2352 if (ramp_delay
== 0) {
2353 rdev_warn(rdev
, "ramp_delay not set\n");
2358 if (!rdev
->desc
->ops
->list_voltage
)
2361 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2362 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2364 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2366 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2369 * regulator_sync_voltage - re-apply last regulator output voltage
2370 * @regulator: regulator source
2372 * Re-apply the last configured voltage. This is intended to be used
2373 * where some external control source the consumer is cooperating with
2374 * has caused the configured voltage to change.
2376 int regulator_sync_voltage(struct regulator
*regulator
)
2378 struct regulator_dev
*rdev
= regulator
->rdev
;
2379 int ret
, min_uV
, max_uV
;
2381 mutex_lock(&rdev
->mutex
);
2383 if (!rdev
->desc
->ops
->set_voltage
&&
2384 !rdev
->desc
->ops
->set_voltage_sel
) {
2389 /* This is only going to work if we've had a voltage configured. */
2390 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2395 min_uV
= regulator
->min_uV
;
2396 max_uV
= regulator
->max_uV
;
2398 /* This should be a paranoia check... */
2399 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2403 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2407 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2410 mutex_unlock(&rdev
->mutex
);
2413 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2415 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2419 if (rdev
->desc
->ops
->get_voltage_sel
) {
2420 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2423 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2424 } else if (rdev
->desc
->ops
->get_voltage
) {
2425 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2426 } else if (rdev
->desc
->ops
->list_voltage
) {
2427 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2434 return ret
- rdev
->constraints
->uV_offset
;
2438 * regulator_get_voltage - get regulator output voltage
2439 * @regulator: regulator source
2441 * This returns the current regulator voltage in uV.
2443 * NOTE: If the regulator is disabled it will return the voltage value. This
2444 * function should not be used to determine regulator state.
2446 int regulator_get_voltage(struct regulator
*regulator
)
2450 mutex_lock(®ulator
->rdev
->mutex
);
2452 ret
= _regulator_get_voltage(regulator
->rdev
);
2454 mutex_unlock(®ulator
->rdev
->mutex
);
2458 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2461 * regulator_set_current_limit - set regulator output current limit
2462 * @regulator: regulator source
2463 * @min_uA: Minimuum supported current in uA
2464 * @max_uA: Maximum supported current in uA
2466 * Sets current sink to the desired output current. This can be set during
2467 * any regulator state. IOW, regulator can be disabled or enabled.
2469 * If the regulator is enabled then the current will change to the new value
2470 * immediately otherwise if the regulator is disabled the regulator will
2471 * output at the new current when enabled.
2473 * NOTE: Regulator system constraints must be set for this regulator before
2474 * calling this function otherwise this call will fail.
2476 int regulator_set_current_limit(struct regulator
*regulator
,
2477 int min_uA
, int max_uA
)
2479 struct regulator_dev
*rdev
= regulator
->rdev
;
2482 mutex_lock(&rdev
->mutex
);
2485 if (!rdev
->desc
->ops
->set_current_limit
) {
2490 /* constraints check */
2491 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2495 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2497 mutex_unlock(&rdev
->mutex
);
2500 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2502 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2506 mutex_lock(&rdev
->mutex
);
2509 if (!rdev
->desc
->ops
->get_current_limit
) {
2514 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2516 mutex_unlock(&rdev
->mutex
);
2521 * regulator_get_current_limit - get regulator output current
2522 * @regulator: regulator source
2524 * This returns the current supplied by the specified current sink in uA.
2526 * NOTE: If the regulator is disabled it will return the current value. This
2527 * function should not be used to determine regulator state.
2529 int regulator_get_current_limit(struct regulator
*regulator
)
2531 return _regulator_get_current_limit(regulator
->rdev
);
2533 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2536 * regulator_set_mode - set regulator operating mode
2537 * @regulator: regulator source
2538 * @mode: operating mode - one of the REGULATOR_MODE constants
2540 * Set regulator operating mode to increase regulator efficiency or improve
2541 * regulation performance.
2543 * NOTE: Regulator system constraints must be set for this regulator before
2544 * calling this function otherwise this call will fail.
2546 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2548 struct regulator_dev
*rdev
= regulator
->rdev
;
2550 int regulator_curr_mode
;
2552 mutex_lock(&rdev
->mutex
);
2555 if (!rdev
->desc
->ops
->set_mode
) {
2560 /* return if the same mode is requested */
2561 if (rdev
->desc
->ops
->get_mode
) {
2562 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2563 if (regulator_curr_mode
== mode
) {
2569 /* constraints check */
2570 ret
= regulator_mode_constrain(rdev
, &mode
);
2574 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2576 mutex_unlock(&rdev
->mutex
);
2579 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2581 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2585 mutex_lock(&rdev
->mutex
);
2588 if (!rdev
->desc
->ops
->get_mode
) {
2593 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2595 mutex_unlock(&rdev
->mutex
);
2600 * regulator_get_mode - get regulator operating mode
2601 * @regulator: regulator source
2603 * Get the current regulator operating mode.
2605 unsigned int regulator_get_mode(struct regulator
*regulator
)
2607 return _regulator_get_mode(regulator
->rdev
);
2609 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2612 * regulator_set_optimum_mode - set regulator optimum operating mode
2613 * @regulator: regulator source
2614 * @uA_load: load current
2616 * Notifies the regulator core of a new device load. This is then used by
2617 * DRMS (if enabled by constraints) to set the most efficient regulator
2618 * operating mode for the new regulator loading.
2620 * Consumer devices notify their supply regulator of the maximum power
2621 * they will require (can be taken from device datasheet in the power
2622 * consumption tables) when they change operational status and hence power
2623 * state. Examples of operational state changes that can affect power
2624 * consumption are :-
2626 * o Device is opened / closed.
2627 * o Device I/O is about to begin or has just finished.
2628 * o Device is idling in between work.
2630 * This information is also exported via sysfs to userspace.
2632 * DRMS will sum the total requested load on the regulator and change
2633 * to the most efficient operating mode if platform constraints allow.
2635 * Returns the new regulator mode or error.
2637 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
2639 struct regulator_dev
*rdev
= regulator
->rdev
;
2640 struct regulator
*consumer
;
2641 int ret
, output_uV
, input_uV
= 0, total_uA_load
= 0;
2645 input_uV
= regulator_get_voltage(rdev
->supply
);
2647 mutex_lock(&rdev
->mutex
);
2650 * first check to see if we can set modes at all, otherwise just
2651 * tell the consumer everything is OK.
2653 regulator
->uA_load
= uA_load
;
2654 ret
= regulator_check_drms(rdev
);
2660 if (!rdev
->desc
->ops
->get_optimum_mode
)
2664 * we can actually do this so any errors are indicators of
2665 * potential real failure.
2669 if (!rdev
->desc
->ops
->set_mode
)
2672 /* get output voltage */
2673 output_uV
= _regulator_get_voltage(rdev
);
2674 if (output_uV
<= 0) {
2675 rdev_err(rdev
, "invalid output voltage found\n");
2679 /* No supply? Use constraint voltage */
2681 input_uV
= rdev
->constraints
->input_uV
;
2682 if (input_uV
<= 0) {
2683 rdev_err(rdev
, "invalid input voltage found\n");
2687 /* calc total requested load for this regulator */
2688 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
2689 total_uA_load
+= consumer
->uA_load
;
2691 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
2692 input_uV
, output_uV
,
2694 ret
= regulator_mode_constrain(rdev
, &mode
);
2696 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2697 total_uA_load
, input_uV
, output_uV
);
2701 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2703 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
2708 mutex_unlock(&rdev
->mutex
);
2711 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
2714 * regulator_set_bypass_regmap - Default set_bypass() using regmap
2716 * @rdev: device to operate on.
2717 * @enable: state to set.
2719 int regulator_set_bypass_regmap(struct regulator_dev
*rdev
, bool enable
)
2724 val
= rdev
->desc
->bypass_mask
;
2728 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->bypass_reg
,
2729 rdev
->desc
->bypass_mask
, val
);
2731 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap
);
2734 * regulator_get_bypass_regmap - Default get_bypass() using regmap
2736 * @rdev: device to operate on.
2737 * @enable: current state.
2739 int regulator_get_bypass_regmap(struct regulator_dev
*rdev
, bool *enable
)
2744 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->bypass_reg
, &val
);
2748 *enable
= val
& rdev
->desc
->bypass_mask
;
2752 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap
);
2755 * regulator_allow_bypass - allow the regulator to go into bypass mode
2757 * @regulator: Regulator to configure
2758 * @allow: enable or disable bypass mode
2760 * Allow the regulator to go into bypass mode if all other consumers
2761 * for the regulator also enable bypass mode and the machine
2762 * constraints allow this. Bypass mode means that the regulator is
2763 * simply passing the input directly to the output with no regulation.
2765 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
2767 struct regulator_dev
*rdev
= regulator
->rdev
;
2770 if (!rdev
->desc
->ops
->set_bypass
)
2773 if (rdev
->constraints
&&
2774 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
2777 mutex_lock(&rdev
->mutex
);
2779 if (enable
&& !regulator
->bypass
) {
2780 rdev
->bypass_count
++;
2782 if (rdev
->bypass_count
== rdev
->open_count
) {
2783 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2785 rdev
->bypass_count
--;
2788 } else if (!enable
&& regulator
->bypass
) {
2789 rdev
->bypass_count
--;
2791 if (rdev
->bypass_count
!= rdev
->open_count
) {
2792 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2794 rdev
->bypass_count
++;
2799 regulator
->bypass
= enable
;
2801 mutex_unlock(&rdev
->mutex
);
2805 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
2808 * regulator_register_notifier - register regulator event notifier
2809 * @regulator: regulator source
2810 * @nb: notifier block
2812 * Register notifier block to receive regulator events.
2814 int regulator_register_notifier(struct regulator
*regulator
,
2815 struct notifier_block
*nb
)
2817 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
2820 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
2823 * regulator_unregister_notifier - unregister regulator event notifier
2824 * @regulator: regulator source
2825 * @nb: notifier block
2827 * Unregister regulator event notifier block.
2829 int regulator_unregister_notifier(struct regulator
*regulator
,
2830 struct notifier_block
*nb
)
2832 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
2835 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
2837 /* notify regulator consumers and downstream regulator consumers.
2838 * Note mutex must be held by caller.
2840 static void _notifier_call_chain(struct regulator_dev
*rdev
,
2841 unsigned long event
, void *data
)
2843 /* call rdev chain first */
2844 blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
2848 * regulator_bulk_get - get multiple regulator consumers
2850 * @dev: Device to supply
2851 * @num_consumers: Number of consumers to register
2852 * @consumers: Configuration of consumers; clients are stored here.
2854 * @return 0 on success, an errno on failure.
2856 * This helper function allows drivers to get several regulator
2857 * consumers in one operation. If any of the regulators cannot be
2858 * acquired then any regulators that were allocated will be freed
2859 * before returning to the caller.
2861 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
2862 struct regulator_bulk_data
*consumers
)
2867 for (i
= 0; i
< num_consumers
; i
++)
2868 consumers
[i
].consumer
= NULL
;
2870 for (i
= 0; i
< num_consumers
; i
++) {
2871 consumers
[i
].consumer
= regulator_get(dev
,
2872 consumers
[i
].supply
);
2873 if (IS_ERR(consumers
[i
].consumer
)) {
2874 ret
= PTR_ERR(consumers
[i
].consumer
);
2875 dev_err(dev
, "Failed to get supply '%s': %d\n",
2876 consumers
[i
].supply
, ret
);
2877 consumers
[i
].consumer
= NULL
;
2886 regulator_put(consumers
[i
].consumer
);
2890 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
2893 * devm_regulator_bulk_get - managed get multiple regulator consumers
2895 * @dev: Device to supply
2896 * @num_consumers: Number of consumers to register
2897 * @consumers: Configuration of consumers; clients are stored here.
2899 * @return 0 on success, an errno on failure.
2901 * This helper function allows drivers to get several regulator
2902 * consumers in one operation with management, the regulators will
2903 * automatically be freed when the device is unbound. If any of the
2904 * regulators cannot be acquired then any regulators that were
2905 * allocated will be freed before returning to the caller.
2907 int devm_regulator_bulk_get(struct device
*dev
, int num_consumers
,
2908 struct regulator_bulk_data
*consumers
)
2913 for (i
= 0; i
< num_consumers
; i
++)
2914 consumers
[i
].consumer
= NULL
;
2916 for (i
= 0; i
< num_consumers
; i
++) {
2917 consumers
[i
].consumer
= devm_regulator_get(dev
,
2918 consumers
[i
].supply
);
2919 if (IS_ERR(consumers
[i
].consumer
)) {
2920 ret
= PTR_ERR(consumers
[i
].consumer
);
2921 dev_err(dev
, "Failed to get supply '%s': %d\n",
2922 consumers
[i
].supply
, ret
);
2923 consumers
[i
].consumer
= NULL
;
2931 for (i
= 0; i
< num_consumers
&& consumers
[i
].consumer
; i
++)
2932 devm_regulator_put(consumers
[i
].consumer
);
2936 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get
);
2938 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
2940 struct regulator_bulk_data
*bulk
= data
;
2942 bulk
->ret
= regulator_enable(bulk
->consumer
);
2946 * regulator_bulk_enable - enable multiple regulator consumers
2948 * @num_consumers: Number of consumers
2949 * @consumers: Consumer data; clients are stored here.
2950 * @return 0 on success, an errno on failure
2952 * This convenience API allows consumers to enable multiple regulator
2953 * clients in a single API call. If any consumers cannot be enabled
2954 * then any others that were enabled will be disabled again prior to
2957 int regulator_bulk_enable(int num_consumers
,
2958 struct regulator_bulk_data
*consumers
)
2960 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
2964 for (i
= 0; i
< num_consumers
; i
++) {
2965 if (consumers
[i
].consumer
->always_on
)
2966 consumers
[i
].ret
= 0;
2968 async_schedule_domain(regulator_bulk_enable_async
,
2969 &consumers
[i
], &async_domain
);
2972 async_synchronize_full_domain(&async_domain
);
2974 /* If any consumer failed we need to unwind any that succeeded */
2975 for (i
= 0; i
< num_consumers
; i
++) {
2976 if (consumers
[i
].ret
!= 0) {
2977 ret
= consumers
[i
].ret
;
2985 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
, ret
);
2987 regulator_disable(consumers
[i
].consumer
);
2991 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
2994 * regulator_bulk_disable - disable multiple regulator consumers
2996 * @num_consumers: Number of consumers
2997 * @consumers: Consumer data; clients are stored here.
2998 * @return 0 on success, an errno on failure
3000 * This convenience API allows consumers to disable multiple regulator
3001 * clients in a single API call. If any consumers cannot be disabled
3002 * then any others that were disabled will be enabled again prior to
3005 int regulator_bulk_disable(int num_consumers
,
3006 struct regulator_bulk_data
*consumers
)
3011 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3012 ret
= regulator_disable(consumers
[i
].consumer
);
3020 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3021 for (++i
; i
< num_consumers
; ++i
) {
3022 r
= regulator_enable(consumers
[i
].consumer
);
3024 pr_err("Failed to reename %s: %d\n",
3025 consumers
[i
].supply
, r
);
3030 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3033 * regulator_bulk_force_disable - force disable multiple regulator consumers
3035 * @num_consumers: Number of consumers
3036 * @consumers: Consumer data; clients are stored here.
3037 * @return 0 on success, an errno on failure
3039 * This convenience API allows consumers to forcibly disable multiple regulator
3040 * clients in a single API call.
3041 * NOTE: This should be used for situations when device damage will
3042 * likely occur if the regulators are not disabled (e.g. over temp).
3043 * Although regulator_force_disable function call for some consumers can
3044 * return error numbers, the function is called for all consumers.
3046 int regulator_bulk_force_disable(int num_consumers
,
3047 struct regulator_bulk_data
*consumers
)
3052 for (i
= 0; i
< num_consumers
; i
++)
3054 regulator_force_disable(consumers
[i
].consumer
);
3056 for (i
= 0; i
< num_consumers
; i
++) {
3057 if (consumers
[i
].ret
!= 0) {
3058 ret
= consumers
[i
].ret
;
3067 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3070 * regulator_bulk_free - free multiple regulator consumers
3072 * @num_consumers: Number of consumers
3073 * @consumers: Consumer data; clients are stored here.
3075 * This convenience API allows consumers to free multiple regulator
3076 * clients in a single API call.
3078 void regulator_bulk_free(int num_consumers
,
3079 struct regulator_bulk_data
*consumers
)
3083 for (i
= 0; i
< num_consumers
; i
++) {
3084 regulator_put(consumers
[i
].consumer
);
3085 consumers
[i
].consumer
= NULL
;
3088 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3091 * regulator_notifier_call_chain - call regulator event notifier
3092 * @rdev: regulator source
3093 * @event: notifier block
3094 * @data: callback-specific data.
3096 * Called by regulator drivers to notify clients a regulator event has
3097 * occurred. We also notify regulator clients downstream.
3098 * Note lock must be held by caller.
3100 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3101 unsigned long event
, void *data
)
3103 _notifier_call_chain(rdev
, event
, data
);
3107 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3110 * regulator_mode_to_status - convert a regulator mode into a status
3112 * @mode: Mode to convert
3114 * Convert a regulator mode into a status.
3116 int regulator_mode_to_status(unsigned int mode
)
3119 case REGULATOR_MODE_FAST
:
3120 return REGULATOR_STATUS_FAST
;
3121 case REGULATOR_MODE_NORMAL
:
3122 return REGULATOR_STATUS_NORMAL
;
3123 case REGULATOR_MODE_IDLE
:
3124 return REGULATOR_STATUS_IDLE
;
3125 case REGULATOR_MODE_STANDBY
:
3126 return REGULATOR_STATUS_STANDBY
;
3128 return REGULATOR_STATUS_UNDEFINED
;
3131 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3134 * To avoid cluttering sysfs (and memory) with useless state, only
3135 * create attributes that can be meaningfully displayed.
3137 static int add_regulator_attributes(struct regulator_dev
*rdev
)
3139 struct device
*dev
= &rdev
->dev
;
3140 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3143 /* some attributes need specific methods to be displayed */
3144 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3145 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3146 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0)) {
3147 status
= device_create_file(dev
, &dev_attr_microvolts
);
3151 if (ops
->get_current_limit
) {
3152 status
= device_create_file(dev
, &dev_attr_microamps
);
3156 if (ops
->get_mode
) {
3157 status
= device_create_file(dev
, &dev_attr_opmode
);
3161 if (ops
->is_enabled
) {
3162 status
= device_create_file(dev
, &dev_attr_state
);
3166 if (ops
->get_status
) {
3167 status
= device_create_file(dev
, &dev_attr_status
);
3171 if (ops
->get_bypass
) {
3172 status
= device_create_file(dev
, &dev_attr_bypass
);
3177 /* some attributes are type-specific */
3178 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
3179 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
3184 /* all the other attributes exist to support constraints;
3185 * don't show them if there are no constraints, or if the
3186 * relevant supporting methods are missing.
3188 if (!rdev
->constraints
)
3191 /* constraints need specific supporting methods */
3192 if (ops
->set_voltage
|| ops
->set_voltage_sel
) {
3193 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
3196 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
3200 if (ops
->set_current_limit
) {
3201 status
= device_create_file(dev
, &dev_attr_min_microamps
);
3204 status
= device_create_file(dev
, &dev_attr_max_microamps
);
3209 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
3212 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
3215 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
3219 if (ops
->set_suspend_voltage
) {
3220 status
= device_create_file(dev
,
3221 &dev_attr_suspend_standby_microvolts
);
3224 status
= device_create_file(dev
,
3225 &dev_attr_suspend_mem_microvolts
);
3228 status
= device_create_file(dev
,
3229 &dev_attr_suspend_disk_microvolts
);
3234 if (ops
->set_suspend_mode
) {
3235 status
= device_create_file(dev
,
3236 &dev_attr_suspend_standby_mode
);
3239 status
= device_create_file(dev
,
3240 &dev_attr_suspend_mem_mode
);
3243 status
= device_create_file(dev
,
3244 &dev_attr_suspend_disk_mode
);
3252 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3254 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3255 if (!rdev
->debugfs
) {
3256 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3260 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3262 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3264 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3265 &rdev
->bypass_count
);
3269 * regulator_register - register regulator
3270 * @regulator_desc: regulator to register
3271 * @config: runtime configuration for regulator
3273 * Called by regulator drivers to register a regulator.
3274 * Returns 0 on success.
3276 struct regulator_dev
*
3277 regulator_register(const struct regulator_desc
*regulator_desc
,
3278 const struct regulator_config
*config
)
3280 const struct regulation_constraints
*constraints
= NULL
;
3281 const struct regulator_init_data
*init_data
;
3282 static atomic_t regulator_no
= ATOMIC_INIT(0);
3283 struct regulator_dev
*rdev
;
3286 const char *supply
= NULL
;
3288 if (regulator_desc
== NULL
|| config
== NULL
)
3289 return ERR_PTR(-EINVAL
);
3294 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3295 return ERR_PTR(-EINVAL
);
3297 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3298 regulator_desc
->type
!= REGULATOR_CURRENT
)
3299 return ERR_PTR(-EINVAL
);
3301 /* Only one of each should be implemented */
3302 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3303 regulator_desc
->ops
->get_voltage_sel
);
3304 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3305 regulator_desc
->ops
->set_voltage_sel
);
3307 /* If we're using selectors we must implement list_voltage. */
3308 if (regulator_desc
->ops
->get_voltage_sel
&&
3309 !regulator_desc
->ops
->list_voltage
) {
3310 return ERR_PTR(-EINVAL
);
3312 if (regulator_desc
->ops
->set_voltage_sel
&&
3313 !regulator_desc
->ops
->list_voltage
) {
3314 return ERR_PTR(-EINVAL
);
3317 init_data
= config
->init_data
;
3319 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3321 return ERR_PTR(-ENOMEM
);
3323 mutex_lock(®ulator_list_mutex
);
3325 mutex_init(&rdev
->mutex
);
3326 rdev
->reg_data
= config
->driver_data
;
3327 rdev
->owner
= regulator_desc
->owner
;
3328 rdev
->desc
= regulator_desc
;
3330 rdev
->regmap
= config
->regmap
;
3331 else if (dev_get_regmap(dev
, NULL
))
3332 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3333 else if (dev
->parent
)
3334 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3335 INIT_LIST_HEAD(&rdev
->consumer_list
);
3336 INIT_LIST_HEAD(&rdev
->list
);
3337 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3338 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3340 /* preform any regulator specific init */
3341 if (init_data
&& init_data
->regulator_init
) {
3342 ret
= init_data
->regulator_init(rdev
->reg_data
);
3347 /* register with sysfs */
3348 rdev
->dev
.class = ®ulator_class
;
3349 rdev
->dev
.of_node
= config
->of_node
;
3350 rdev
->dev
.parent
= dev
;
3351 dev_set_name(&rdev
->dev
, "regulator.%d",
3352 atomic_inc_return(®ulator_no
) - 1);
3353 ret
= device_register(&rdev
->dev
);
3355 put_device(&rdev
->dev
);
3359 dev_set_drvdata(&rdev
->dev
, rdev
);
3361 if (config
->ena_gpio
&& gpio_is_valid(config
->ena_gpio
)) {
3362 ret
= gpio_request_one(config
->ena_gpio
,
3363 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
3364 rdev_get_name(rdev
));
3366 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3367 config
->ena_gpio
, ret
);
3371 rdev
->ena_gpio
= config
->ena_gpio
;
3372 rdev
->ena_gpio_invert
= config
->ena_gpio_invert
;
3374 if (config
->ena_gpio_flags
& GPIOF_OUT_INIT_HIGH
)
3375 rdev
->ena_gpio_state
= 1;
3377 if (rdev
->ena_gpio_invert
)
3378 rdev
->ena_gpio_state
= !rdev
->ena_gpio_state
;
3381 /* set regulator constraints */
3383 constraints
= &init_data
->constraints
;
3385 ret
= set_machine_constraints(rdev
, constraints
);
3389 /* add attributes supported by this regulator */
3390 ret
= add_regulator_attributes(rdev
);
3394 if (init_data
&& init_data
->supply_regulator
)
3395 supply
= init_data
->supply_regulator
;
3396 else if (regulator_desc
->supply_name
)
3397 supply
= regulator_desc
->supply_name
;
3400 struct regulator_dev
*r
;
3402 r
= regulator_dev_lookup(dev
, supply
, &ret
);
3405 dev_err(dev
, "Failed to find supply %s\n", supply
);
3406 ret
= -EPROBE_DEFER
;
3410 ret
= set_supply(rdev
, r
);
3414 /* Enable supply if rail is enabled */
3415 if (_regulator_is_enabled(rdev
)) {
3416 ret
= regulator_enable(rdev
->supply
);
3422 /* add consumers devices */
3424 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3425 ret
= set_consumer_device_supply(rdev
,
3426 init_data
->consumer_supplies
[i
].dev_name
,
3427 init_data
->consumer_supplies
[i
].supply
);
3429 dev_err(dev
, "Failed to set supply %s\n",
3430 init_data
->consumer_supplies
[i
].supply
);
3431 goto unset_supplies
;
3436 list_add(&rdev
->list
, ®ulator_list
);
3438 rdev_init_debugfs(rdev
);
3440 mutex_unlock(®ulator_list_mutex
);
3444 unset_regulator_supplies(rdev
);
3448 regulator_put(rdev
->supply
);
3450 gpio_free(rdev
->ena_gpio
);
3451 kfree(rdev
->constraints
);
3452 device_unregister(&rdev
->dev
);
3453 /* device core frees rdev */
3454 rdev
= ERR_PTR(ret
);
3459 rdev
= ERR_PTR(ret
);
3462 EXPORT_SYMBOL_GPL(regulator_register
);
3465 * regulator_unregister - unregister regulator
3466 * @rdev: regulator to unregister
3468 * Called by regulator drivers to unregister a regulator.
3470 void regulator_unregister(struct regulator_dev
*rdev
)
3476 regulator_put(rdev
->supply
);
3477 mutex_lock(®ulator_list_mutex
);
3478 debugfs_remove_recursive(rdev
->debugfs
);
3479 flush_work_sync(&rdev
->disable_work
.work
);
3480 WARN_ON(rdev
->open_count
);
3481 unset_regulator_supplies(rdev
);
3482 list_del(&rdev
->list
);
3483 kfree(rdev
->constraints
);
3485 gpio_free(rdev
->ena_gpio
);
3486 device_unregister(&rdev
->dev
);
3487 mutex_unlock(®ulator_list_mutex
);
3489 EXPORT_SYMBOL_GPL(regulator_unregister
);
3492 * regulator_suspend_prepare - prepare regulators for system wide suspend
3493 * @state: system suspend state
3495 * Configure each regulator with it's suspend operating parameters for state.
3496 * This will usually be called by machine suspend code prior to supending.
3498 int regulator_suspend_prepare(suspend_state_t state
)
3500 struct regulator_dev
*rdev
;
3503 /* ON is handled by regulator active state */
3504 if (state
== PM_SUSPEND_ON
)
3507 mutex_lock(®ulator_list_mutex
);
3508 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3510 mutex_lock(&rdev
->mutex
);
3511 ret
= suspend_prepare(rdev
, state
);
3512 mutex_unlock(&rdev
->mutex
);
3515 rdev_err(rdev
, "failed to prepare\n");
3520 mutex_unlock(®ulator_list_mutex
);
3523 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3526 * regulator_suspend_finish - resume regulators from system wide suspend
3528 * Turn on regulators that might be turned off by regulator_suspend_prepare
3529 * and that should be turned on according to the regulators properties.
3531 int regulator_suspend_finish(void)
3533 struct regulator_dev
*rdev
;
3536 mutex_lock(®ulator_list_mutex
);
3537 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3538 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3540 mutex_lock(&rdev
->mutex
);
3541 if ((rdev
->use_count
> 0 || rdev
->constraints
->always_on
) &&
3543 error
= ops
->enable(rdev
);
3547 if (!has_full_constraints
)
3551 if (!_regulator_is_enabled(rdev
))
3554 error
= ops
->disable(rdev
);
3559 mutex_unlock(&rdev
->mutex
);
3561 mutex_unlock(®ulator_list_mutex
);
3564 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3567 * regulator_has_full_constraints - the system has fully specified constraints
3569 * Calling this function will cause the regulator API to disable all
3570 * regulators which have a zero use count and don't have an always_on
3571 * constraint in a late_initcall.
3573 * The intention is that this will become the default behaviour in a
3574 * future kernel release so users are encouraged to use this facility
3577 void regulator_has_full_constraints(void)
3579 has_full_constraints
= 1;
3581 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3584 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3586 * Calling this function will cause the regulator API to provide a
3587 * dummy regulator to consumers if no physical regulator is found,
3588 * allowing most consumers to proceed as though a regulator were
3589 * configured. This allows systems such as those with software
3590 * controllable regulators for the CPU core only to be brought up more
3593 void regulator_use_dummy_regulator(void)
3595 board_wants_dummy_regulator
= true;
3597 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator
);
3600 * rdev_get_drvdata - get rdev regulator driver data
3603 * Get rdev regulator driver private data. This call can be used in the
3604 * regulator driver context.
3606 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3608 return rdev
->reg_data
;
3610 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3613 * regulator_get_drvdata - get regulator driver data
3614 * @regulator: regulator
3616 * Get regulator driver private data. This call can be used in the consumer
3617 * driver context when non API regulator specific functions need to be called.
3619 void *regulator_get_drvdata(struct regulator
*regulator
)
3621 return regulator
->rdev
->reg_data
;
3623 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3626 * regulator_set_drvdata - set regulator driver data
3627 * @regulator: regulator
3630 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3632 regulator
->rdev
->reg_data
= data
;
3634 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3637 * regulator_get_id - get regulator ID
3640 int rdev_get_id(struct regulator_dev
*rdev
)
3642 return rdev
->desc
->id
;
3644 EXPORT_SYMBOL_GPL(rdev_get_id
);
3646 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3650 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3652 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3654 return reg_init_data
->driver_data
;
3656 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3658 #ifdef CONFIG_DEBUG_FS
3659 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3660 size_t count
, loff_t
*ppos
)
3662 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3663 ssize_t len
, ret
= 0;
3664 struct regulator_map
*map
;
3669 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3670 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3672 rdev_get_name(map
->regulator
), map
->dev_name
,
3676 if (ret
> PAGE_SIZE
) {
3682 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3690 static const struct file_operations supply_map_fops
= {
3691 #ifdef CONFIG_DEBUG_FS
3692 .read
= supply_map_read_file
,
3693 .llseek
= default_llseek
,
3697 static int __init
regulator_init(void)
3701 ret
= class_register(®ulator_class
);
3703 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3705 pr_warn("regulator: Failed to create debugfs directory\n");
3707 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3710 regulator_dummy_init();
3715 /* init early to allow our consumers to complete system booting */
3716 core_initcall(regulator_init
);
3718 static int __init
regulator_init_complete(void)
3720 struct regulator_dev
*rdev
;
3721 struct regulator_ops
*ops
;
3722 struct regulation_constraints
*c
;
3726 * Since DT doesn't provide an idiomatic mechanism for
3727 * enabling full constraints and since it's much more natural
3728 * with DT to provide them just assume that a DT enabled
3729 * system has full constraints.
3731 if (of_have_populated_dt())
3732 has_full_constraints
= true;
3734 mutex_lock(®ulator_list_mutex
);
3736 /* If we have a full configuration then disable any regulators
3737 * which are not in use or always_on. This will become the
3738 * default behaviour in the future.
3740 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3741 ops
= rdev
->desc
->ops
;
3742 c
= rdev
->constraints
;
3744 if (!ops
->disable
|| (c
&& c
->always_on
))
3747 mutex_lock(&rdev
->mutex
);
3749 if (rdev
->use_count
)
3752 /* If we can't read the status assume it's on. */
3753 if (ops
->is_enabled
)
3754 enabled
= ops
->is_enabled(rdev
);
3761 if (has_full_constraints
) {
3762 /* We log since this may kill the system if it
3764 rdev_info(rdev
, "disabling\n");
3765 ret
= ops
->disable(rdev
);
3767 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
3770 /* The intention is that in future we will
3771 * assume that full constraints are provided
3772 * so warn even if we aren't going to do
3775 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
3779 mutex_unlock(&rdev
->mutex
);
3782 mutex_unlock(®ulator_list_mutex
);
3786 late_initcall(regulator_init_complete
);