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
);
1384 /* Locks held by regulator_put() */
1385 static void _regulator_put(struct regulator
*regulator
)
1387 struct regulator_dev
*rdev
;
1389 if (regulator
== NULL
|| IS_ERR(regulator
))
1392 rdev
= regulator
->rdev
;
1394 debugfs_remove_recursive(regulator
->debugfs
);
1396 /* remove any sysfs entries */
1398 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1399 kfree(regulator
->supply_name
);
1400 list_del(®ulator
->list
);
1404 rdev
->exclusive
= 0;
1406 module_put(rdev
->owner
);
1410 * regulator_put - "free" the regulator source
1411 * @regulator: regulator source
1413 * Note: drivers must ensure that all regulator_enable calls made on this
1414 * regulator source are balanced by regulator_disable calls prior to calling
1417 void regulator_put(struct regulator
*regulator
)
1419 mutex_lock(®ulator_list_mutex
);
1420 _regulator_put(regulator
);
1421 mutex_unlock(®ulator_list_mutex
);
1423 EXPORT_SYMBOL_GPL(regulator_put
);
1425 static int devm_regulator_match(struct device
*dev
, void *res
, void *data
)
1427 struct regulator
**r
= res
;
1436 * devm_regulator_put - Resource managed regulator_put()
1437 * @regulator: regulator to free
1439 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1440 * this function will not need to be called and the resource management
1441 * code will ensure that the resource is freed.
1443 void devm_regulator_put(struct regulator
*regulator
)
1447 rc
= devres_release(regulator
->dev
, devm_regulator_release
,
1448 devm_regulator_match
, regulator
);
1452 EXPORT_SYMBOL_GPL(devm_regulator_put
);
1454 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1458 /* Query before enabling in case configuration dependent. */
1459 ret
= _regulator_get_enable_time(rdev
);
1463 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1467 trace_regulator_enable(rdev_get_name(rdev
));
1469 if (rdev
->ena_gpio
) {
1470 gpio_set_value_cansleep(rdev
->ena_gpio
,
1471 !rdev
->ena_gpio_invert
);
1472 rdev
->ena_gpio_state
= 1;
1473 } else if (rdev
->desc
->ops
->enable
) {
1474 ret
= rdev
->desc
->ops
->enable(rdev
);
1481 /* Allow the regulator to ramp; it would be useful to extend
1482 * this for bulk operations so that the regulators can ramp
1484 trace_regulator_enable_delay(rdev_get_name(rdev
));
1486 if (delay
>= 1000) {
1487 mdelay(delay
/ 1000);
1488 udelay(delay
% 1000);
1493 trace_regulator_enable_complete(rdev_get_name(rdev
));
1498 /* locks held by regulator_enable() */
1499 static int _regulator_enable(struct regulator_dev
*rdev
)
1503 /* check voltage and requested load before enabling */
1504 if (rdev
->constraints
&&
1505 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1506 drms_uA_update(rdev
);
1508 if (rdev
->use_count
== 0) {
1509 /* The regulator may on if it's not switchable or left on */
1510 ret
= _regulator_is_enabled(rdev
);
1511 if (ret
== -EINVAL
|| ret
== 0) {
1512 if (!_regulator_can_change_status(rdev
))
1515 ret
= _regulator_do_enable(rdev
);
1519 } else if (ret
< 0) {
1520 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1523 /* Fallthrough on positive return values - already enabled */
1532 * regulator_enable - enable regulator output
1533 * @regulator: regulator source
1535 * Request that the regulator be enabled with the regulator output at
1536 * the predefined voltage or current value. Calls to regulator_enable()
1537 * must be balanced with calls to regulator_disable().
1539 * NOTE: the output value can be set by other drivers, boot loader or may be
1540 * hardwired in the regulator.
1542 int regulator_enable(struct regulator
*regulator
)
1544 struct regulator_dev
*rdev
= regulator
->rdev
;
1547 if (regulator
->always_on
)
1551 ret
= regulator_enable(rdev
->supply
);
1556 mutex_lock(&rdev
->mutex
);
1557 ret
= _regulator_enable(rdev
);
1558 mutex_unlock(&rdev
->mutex
);
1560 if (ret
!= 0 && rdev
->supply
)
1561 regulator_disable(rdev
->supply
);
1565 EXPORT_SYMBOL_GPL(regulator_enable
);
1567 static int _regulator_do_disable(struct regulator_dev
*rdev
)
1571 trace_regulator_disable(rdev_get_name(rdev
));
1573 if (rdev
->ena_gpio
) {
1574 gpio_set_value_cansleep(rdev
->ena_gpio
,
1575 rdev
->ena_gpio_invert
);
1576 rdev
->ena_gpio_state
= 0;
1578 } else if (rdev
->desc
->ops
->disable
) {
1579 ret
= rdev
->desc
->ops
->disable(rdev
);
1584 trace_regulator_disable_complete(rdev_get_name(rdev
));
1586 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1591 /* locks held by regulator_disable() */
1592 static int _regulator_disable(struct regulator_dev
*rdev
)
1596 if (WARN(rdev
->use_count
<= 0,
1597 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1600 /* are we the last user and permitted to disable ? */
1601 if (rdev
->use_count
== 1 &&
1602 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1604 /* we are last user */
1605 if (_regulator_can_change_status(rdev
)) {
1606 ret
= _regulator_do_disable(rdev
);
1608 rdev_err(rdev
, "failed to disable\n");
1613 rdev
->use_count
= 0;
1614 } else if (rdev
->use_count
> 1) {
1616 if (rdev
->constraints
&&
1617 (rdev
->constraints
->valid_ops_mask
&
1618 REGULATOR_CHANGE_DRMS
))
1619 drms_uA_update(rdev
);
1628 * regulator_disable - disable regulator output
1629 * @regulator: regulator source
1631 * Disable the regulator output voltage or current. Calls to
1632 * regulator_enable() must be balanced with calls to
1633 * regulator_disable().
1635 * NOTE: this will only disable the regulator output if no other consumer
1636 * devices have it enabled, the regulator device supports disabling and
1637 * machine constraints permit this operation.
1639 int regulator_disable(struct regulator
*regulator
)
1641 struct regulator_dev
*rdev
= regulator
->rdev
;
1644 if (regulator
->always_on
)
1647 mutex_lock(&rdev
->mutex
);
1648 ret
= _regulator_disable(rdev
);
1649 mutex_unlock(&rdev
->mutex
);
1651 if (ret
== 0 && rdev
->supply
)
1652 regulator_disable(rdev
->supply
);
1656 EXPORT_SYMBOL_GPL(regulator_disable
);
1658 /* locks held by regulator_force_disable() */
1659 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1664 if (rdev
->desc
->ops
->disable
) {
1665 /* ah well, who wants to live forever... */
1666 ret
= rdev
->desc
->ops
->disable(rdev
);
1668 rdev_err(rdev
, "failed to force disable\n");
1671 /* notify other consumers that power has been forced off */
1672 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1673 REGULATOR_EVENT_DISABLE
, NULL
);
1680 * regulator_force_disable - force disable regulator output
1681 * @regulator: regulator source
1683 * Forcibly disable the regulator output voltage or current.
1684 * NOTE: this *will* disable the regulator output even if other consumer
1685 * devices have it enabled. This should be used for situations when device
1686 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1688 int regulator_force_disable(struct regulator
*regulator
)
1690 struct regulator_dev
*rdev
= regulator
->rdev
;
1693 mutex_lock(&rdev
->mutex
);
1694 regulator
->uA_load
= 0;
1695 ret
= _regulator_force_disable(regulator
->rdev
);
1696 mutex_unlock(&rdev
->mutex
);
1699 while (rdev
->open_count
--)
1700 regulator_disable(rdev
->supply
);
1704 EXPORT_SYMBOL_GPL(regulator_force_disable
);
1706 static void regulator_disable_work(struct work_struct
*work
)
1708 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
1712 mutex_lock(&rdev
->mutex
);
1714 BUG_ON(!rdev
->deferred_disables
);
1716 count
= rdev
->deferred_disables
;
1717 rdev
->deferred_disables
= 0;
1719 for (i
= 0; i
< count
; i
++) {
1720 ret
= _regulator_disable(rdev
);
1722 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
1725 mutex_unlock(&rdev
->mutex
);
1728 for (i
= 0; i
< count
; i
++) {
1729 ret
= regulator_disable(rdev
->supply
);
1732 "Supply disable failed: %d\n", ret
);
1739 * regulator_disable_deferred - disable regulator output with delay
1740 * @regulator: regulator source
1741 * @ms: miliseconds until the regulator is disabled
1743 * Execute regulator_disable() on the regulator after a delay. This
1744 * is intended for use with devices that require some time to quiesce.
1746 * NOTE: this will only disable the regulator output if no other consumer
1747 * devices have it enabled, the regulator device supports disabling and
1748 * machine constraints permit this operation.
1750 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
1752 struct regulator_dev
*rdev
= regulator
->rdev
;
1755 if (regulator
->always_on
)
1759 return regulator_disable(regulator
);
1761 mutex_lock(&rdev
->mutex
);
1762 rdev
->deferred_disables
++;
1763 mutex_unlock(&rdev
->mutex
);
1765 ret
= schedule_delayed_work(&rdev
->disable_work
,
1766 msecs_to_jiffies(ms
));
1772 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
1775 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1777 * @rdev: regulator to operate on
1779 * Regulators that use regmap for their register I/O can set the
1780 * enable_reg and enable_mask fields in their descriptor and then use
1781 * this as their is_enabled operation, saving some code.
1783 int regulator_is_enabled_regmap(struct regulator_dev
*rdev
)
1788 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->enable_reg
, &val
);
1792 return (val
& rdev
->desc
->enable_mask
) != 0;
1794 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap
);
1797 * regulator_enable_regmap - standard enable() for regmap users
1799 * @rdev: regulator to operate on
1801 * Regulators that use regmap for their register I/O can set the
1802 * enable_reg and enable_mask fields in their descriptor and then use
1803 * this as their enable() operation, saving some code.
1805 int regulator_enable_regmap(struct regulator_dev
*rdev
)
1807 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1808 rdev
->desc
->enable_mask
,
1809 rdev
->desc
->enable_mask
);
1811 EXPORT_SYMBOL_GPL(regulator_enable_regmap
);
1814 * regulator_disable_regmap - standard disable() for regmap users
1816 * @rdev: regulator to operate on
1818 * Regulators that use regmap for their register I/O can set the
1819 * enable_reg and enable_mask fields in their descriptor and then use
1820 * this as their disable() operation, saving some code.
1822 int regulator_disable_regmap(struct regulator_dev
*rdev
)
1824 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1825 rdev
->desc
->enable_mask
, 0);
1827 EXPORT_SYMBOL_GPL(regulator_disable_regmap
);
1829 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
1831 /* A GPIO control always takes precedence */
1833 return rdev
->ena_gpio_state
;
1835 /* If we don't know then assume that the regulator is always on */
1836 if (!rdev
->desc
->ops
->is_enabled
)
1839 return rdev
->desc
->ops
->is_enabled(rdev
);
1843 * regulator_is_enabled - is the regulator output enabled
1844 * @regulator: regulator source
1846 * Returns positive if the regulator driver backing the source/client
1847 * has requested that the device be enabled, zero if it hasn't, else a
1848 * negative errno code.
1850 * Note that the device backing this regulator handle can have multiple
1851 * users, so it might be enabled even if regulator_enable() was never
1852 * called for this particular source.
1854 int regulator_is_enabled(struct regulator
*regulator
)
1858 if (regulator
->always_on
)
1861 mutex_lock(®ulator
->rdev
->mutex
);
1862 ret
= _regulator_is_enabled(regulator
->rdev
);
1863 mutex_unlock(®ulator
->rdev
->mutex
);
1867 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
1870 * regulator_count_voltages - count regulator_list_voltage() selectors
1871 * @regulator: regulator source
1873 * Returns number of selectors, or negative errno. Selectors are
1874 * numbered starting at zero, and typically correspond to bitfields
1875 * in hardware registers.
1877 int regulator_count_voltages(struct regulator
*regulator
)
1879 struct regulator_dev
*rdev
= regulator
->rdev
;
1881 return rdev
->desc
->n_voltages
? : -EINVAL
;
1883 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
1886 * regulator_list_voltage_linear - List voltages with simple calculation
1888 * @rdev: Regulator device
1889 * @selector: Selector to convert into a voltage
1891 * Regulators with a simple linear mapping between voltages and
1892 * selectors can set min_uV and uV_step in the regulator descriptor
1893 * and then use this function as their list_voltage() operation,
1895 int regulator_list_voltage_linear(struct regulator_dev
*rdev
,
1896 unsigned int selector
)
1898 if (selector
>= rdev
->desc
->n_voltages
)
1901 return rdev
->desc
->min_uV
+ (rdev
->desc
->uV_step
* selector
);
1903 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear
);
1906 * regulator_list_voltage_table - List voltages with table based mapping
1908 * @rdev: Regulator device
1909 * @selector: Selector to convert into a voltage
1911 * Regulators with table based mapping between voltages and
1912 * selectors can set volt_table in the regulator descriptor
1913 * and then use this function as their list_voltage() operation.
1915 int regulator_list_voltage_table(struct regulator_dev
*rdev
,
1916 unsigned int selector
)
1918 if (!rdev
->desc
->volt_table
) {
1919 BUG_ON(!rdev
->desc
->volt_table
);
1923 if (selector
>= rdev
->desc
->n_voltages
)
1926 return rdev
->desc
->volt_table
[selector
];
1928 EXPORT_SYMBOL_GPL(regulator_list_voltage_table
);
1931 * regulator_list_voltage - enumerate supported voltages
1932 * @regulator: regulator source
1933 * @selector: identify voltage to list
1934 * Context: can sleep
1936 * Returns a voltage that can be passed to @regulator_set_voltage(),
1937 * zero if this selector code can't be used on this system, or a
1940 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
1942 struct regulator_dev
*rdev
= regulator
->rdev
;
1943 struct regulator_ops
*ops
= rdev
->desc
->ops
;
1946 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
1949 mutex_lock(&rdev
->mutex
);
1950 ret
= ops
->list_voltage(rdev
, selector
);
1951 mutex_unlock(&rdev
->mutex
);
1954 if (ret
< rdev
->constraints
->min_uV
)
1956 else if (ret
> rdev
->constraints
->max_uV
)
1962 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
1965 * regulator_is_supported_voltage - check if a voltage range can be supported
1967 * @regulator: Regulator to check.
1968 * @min_uV: Minimum required voltage in uV.
1969 * @max_uV: Maximum required voltage in uV.
1971 * Returns a boolean or a negative error code.
1973 int regulator_is_supported_voltage(struct regulator
*regulator
,
1974 int min_uV
, int max_uV
)
1976 struct regulator_dev
*rdev
= regulator
->rdev
;
1977 int i
, voltages
, ret
;
1979 /* If we can't change voltage check the current voltage */
1980 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
1981 ret
= regulator_get_voltage(regulator
);
1983 return (min_uV
<= ret
&& ret
<= max_uV
);
1988 /* Any voltage within constrains range is fine? */
1989 if (rdev
->desc
->continuous_voltage_range
)
1990 return min_uV
>= rdev
->constraints
->min_uV
&&
1991 max_uV
<= rdev
->constraints
->max_uV
;
1993 ret
= regulator_count_voltages(regulator
);
1998 for (i
= 0; i
< voltages
; i
++) {
1999 ret
= regulator_list_voltage(regulator
, i
);
2001 if (ret
>= min_uV
&& ret
<= max_uV
)
2007 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2010 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2012 * @rdev: regulator to operate on
2014 * Regulators that use regmap for their register I/O can set the
2015 * vsel_reg and vsel_mask fields in their descriptor and then use this
2016 * as their get_voltage_vsel operation, saving some code.
2018 int regulator_get_voltage_sel_regmap(struct regulator_dev
*rdev
)
2023 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->vsel_reg
, &val
);
2027 val
&= rdev
->desc
->vsel_mask
;
2028 val
>>= ffs(rdev
->desc
->vsel_mask
) - 1;
2032 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap
);
2035 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2037 * @rdev: regulator to operate on
2038 * @sel: Selector to set
2040 * Regulators that use regmap for their register I/O can set the
2041 * vsel_reg and vsel_mask fields in their descriptor and then use this
2042 * as their set_voltage_vsel operation, saving some code.
2044 int regulator_set_voltage_sel_regmap(struct regulator_dev
*rdev
, unsigned sel
)
2046 sel
<<= ffs(rdev
->desc
->vsel_mask
) - 1;
2048 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->vsel_reg
,
2049 rdev
->desc
->vsel_mask
, sel
);
2051 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap
);
2054 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2056 * @rdev: Regulator to operate on
2057 * @min_uV: Lower bound for voltage
2058 * @max_uV: Upper bound for voltage
2060 * Drivers implementing set_voltage_sel() and list_voltage() can use
2061 * this as their map_voltage() operation. It will find a suitable
2062 * voltage by calling list_voltage() until it gets something in bounds
2063 * for the requested voltages.
2065 int regulator_map_voltage_iterate(struct regulator_dev
*rdev
,
2066 int min_uV
, int max_uV
)
2068 int best_val
= INT_MAX
;
2072 /* Find the smallest voltage that falls within the specified
2075 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2076 ret
= rdev
->desc
->ops
->list_voltage(rdev
, i
);
2080 if (ret
< best_val
&& ret
>= min_uV
&& ret
<= max_uV
) {
2086 if (best_val
!= INT_MAX
)
2091 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate
);
2094 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2096 * @rdev: Regulator to operate on
2097 * @min_uV: Lower bound for voltage
2098 * @max_uV: Upper bound for voltage
2100 * Drivers providing min_uV and uV_step in their regulator_desc can
2101 * use this as their map_voltage() operation.
2103 int regulator_map_voltage_linear(struct regulator_dev
*rdev
,
2104 int min_uV
, int max_uV
)
2108 /* Allow uV_step to be 0 for fixed voltage */
2109 if (rdev
->desc
->n_voltages
== 1 && rdev
->desc
->uV_step
== 0) {
2110 if (min_uV
<= rdev
->desc
->min_uV
&& rdev
->desc
->min_uV
<= max_uV
)
2116 if (!rdev
->desc
->uV_step
) {
2117 BUG_ON(!rdev
->desc
->uV_step
);
2121 if (min_uV
< rdev
->desc
->min_uV
)
2122 min_uV
= rdev
->desc
->min_uV
;
2124 ret
= DIV_ROUND_UP(min_uV
- rdev
->desc
->min_uV
, rdev
->desc
->uV_step
);
2128 /* Map back into a voltage to verify we're still in bounds */
2129 voltage
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2130 if (voltage
< min_uV
|| voltage
> max_uV
)
2135 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear
);
2137 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2138 int min_uV
, int max_uV
)
2143 unsigned int selector
;
2144 int old_selector
= -1;
2146 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2148 min_uV
+= rdev
->constraints
->uV_offset
;
2149 max_uV
+= rdev
->constraints
->uV_offset
;
2152 * If we can't obtain the old selector there is not enough
2153 * info to call set_voltage_time_sel().
2155 if (_regulator_is_enabled(rdev
) &&
2156 rdev
->desc
->ops
->set_voltage_time_sel
&&
2157 rdev
->desc
->ops
->get_voltage_sel
) {
2158 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2159 if (old_selector
< 0)
2160 return old_selector
;
2163 if (rdev
->desc
->ops
->set_voltage
) {
2164 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
,
2168 if (rdev
->desc
->ops
->list_voltage
)
2169 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2172 best_val
= _regulator_get_voltage(rdev
);
2175 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2176 if (rdev
->desc
->ops
->map_voltage
) {
2177 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2180 if (rdev
->desc
->ops
->list_voltage
==
2181 regulator_list_voltage_linear
)
2182 ret
= regulator_map_voltage_linear(rdev
,
2185 ret
= regulator_map_voltage_iterate(rdev
,
2190 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2191 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2193 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
,
2203 /* Call set_voltage_time_sel if successfully obtained old_selector */
2204 if (ret
== 0 && _regulator_is_enabled(rdev
) && old_selector
>= 0 &&
2205 rdev
->desc
->ops
->set_voltage_time_sel
) {
2207 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2208 old_selector
, selector
);
2210 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2215 /* Insert any necessary delays */
2216 if (delay
>= 1000) {
2217 mdelay(delay
/ 1000);
2218 udelay(delay
% 1000);
2224 if (ret
== 0 && best_val
>= 0) {
2225 unsigned long data
= best_val
;
2227 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2231 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2237 * regulator_set_voltage - set regulator output voltage
2238 * @regulator: regulator source
2239 * @min_uV: Minimum required voltage in uV
2240 * @max_uV: Maximum acceptable voltage in uV
2242 * Sets a voltage regulator to the desired output voltage. This can be set
2243 * during any regulator state. IOW, regulator can be disabled or enabled.
2245 * If the regulator is enabled then the voltage will change to the new value
2246 * immediately otherwise if the regulator is disabled the regulator will
2247 * output at the new voltage when enabled.
2249 * NOTE: If the regulator is shared between several devices then the lowest
2250 * request voltage that meets the system constraints will be used.
2251 * Regulator system constraints must be set for this regulator before
2252 * calling this function otherwise this call will fail.
2254 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2256 struct regulator_dev
*rdev
= regulator
->rdev
;
2259 mutex_lock(&rdev
->mutex
);
2261 /* If we're setting the same range as last time the change
2262 * should be a noop (some cpufreq implementations use the same
2263 * voltage for multiple frequencies, for example).
2265 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2269 if (!rdev
->desc
->ops
->set_voltage
&&
2270 !rdev
->desc
->ops
->set_voltage_sel
) {
2275 /* constraints check */
2276 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2279 regulator
->min_uV
= min_uV
;
2280 regulator
->max_uV
= max_uV
;
2282 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2286 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2289 mutex_unlock(&rdev
->mutex
);
2292 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2295 * regulator_set_voltage_time - get raise/fall time
2296 * @regulator: regulator source
2297 * @old_uV: starting voltage in microvolts
2298 * @new_uV: target voltage in microvolts
2300 * Provided with the starting and ending voltage, this function attempts to
2301 * calculate the time in microseconds required to rise or fall to this new
2304 int regulator_set_voltage_time(struct regulator
*regulator
,
2305 int old_uV
, int new_uV
)
2307 struct regulator_dev
*rdev
= regulator
->rdev
;
2308 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2314 /* Currently requires operations to do this */
2315 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2316 || !rdev
->desc
->n_voltages
)
2319 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2320 /* We only look for exact voltage matches here */
2321 voltage
= regulator_list_voltage(regulator
, i
);
2326 if (voltage
== old_uV
)
2328 if (voltage
== new_uV
)
2332 if (old_sel
< 0 || new_sel
< 0)
2335 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2337 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2340 * regulator_set_voltage_time_sel - get raise/fall time
2341 * @rdev: regulator source device
2342 * @old_selector: selector for starting voltage
2343 * @new_selector: selector for target voltage
2345 * Provided with the starting and target voltage selectors, this function
2346 * returns time in microseconds required to rise or fall to this new voltage
2348 * Drivers providing ramp_delay in regulation_constraints can use this as their
2349 * set_voltage_time_sel() operation.
2351 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2352 unsigned int old_selector
,
2353 unsigned int new_selector
)
2355 unsigned int ramp_delay
= 0;
2356 int old_volt
, new_volt
;
2358 if (rdev
->constraints
->ramp_delay
)
2359 ramp_delay
= rdev
->constraints
->ramp_delay
;
2360 else if (rdev
->desc
->ramp_delay
)
2361 ramp_delay
= rdev
->desc
->ramp_delay
;
2363 if (ramp_delay
== 0) {
2364 rdev_warn(rdev
, "ramp_delay not set\n");
2369 if (!rdev
->desc
->ops
->list_voltage
)
2372 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2373 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2375 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2377 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2380 * regulator_sync_voltage - re-apply last regulator output voltage
2381 * @regulator: regulator source
2383 * Re-apply the last configured voltage. This is intended to be used
2384 * where some external control source the consumer is cooperating with
2385 * has caused the configured voltage to change.
2387 int regulator_sync_voltage(struct regulator
*regulator
)
2389 struct regulator_dev
*rdev
= regulator
->rdev
;
2390 int ret
, min_uV
, max_uV
;
2392 mutex_lock(&rdev
->mutex
);
2394 if (!rdev
->desc
->ops
->set_voltage
&&
2395 !rdev
->desc
->ops
->set_voltage_sel
) {
2400 /* This is only going to work if we've had a voltage configured. */
2401 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2406 min_uV
= regulator
->min_uV
;
2407 max_uV
= regulator
->max_uV
;
2409 /* This should be a paranoia check... */
2410 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2414 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2418 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2421 mutex_unlock(&rdev
->mutex
);
2424 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2426 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2430 if (rdev
->desc
->ops
->get_voltage_sel
) {
2431 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2434 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2435 } else if (rdev
->desc
->ops
->get_voltage
) {
2436 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2437 } else if (rdev
->desc
->ops
->list_voltage
) {
2438 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
2445 return ret
- rdev
->constraints
->uV_offset
;
2449 * regulator_get_voltage - get regulator output voltage
2450 * @regulator: regulator source
2452 * This returns the current regulator voltage in uV.
2454 * NOTE: If the regulator is disabled it will return the voltage value. This
2455 * function should not be used to determine regulator state.
2457 int regulator_get_voltage(struct regulator
*regulator
)
2461 mutex_lock(®ulator
->rdev
->mutex
);
2463 ret
= _regulator_get_voltage(regulator
->rdev
);
2465 mutex_unlock(®ulator
->rdev
->mutex
);
2469 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2472 * regulator_set_current_limit - set regulator output current limit
2473 * @regulator: regulator source
2474 * @min_uA: Minimuum supported current in uA
2475 * @max_uA: Maximum supported current in uA
2477 * Sets current sink to the desired output current. This can be set during
2478 * any regulator state. IOW, regulator can be disabled or enabled.
2480 * If the regulator is enabled then the current will change to the new value
2481 * immediately otherwise if the regulator is disabled the regulator will
2482 * output at the new current when enabled.
2484 * NOTE: Regulator system constraints must be set for this regulator before
2485 * calling this function otherwise this call will fail.
2487 int regulator_set_current_limit(struct regulator
*regulator
,
2488 int min_uA
, int max_uA
)
2490 struct regulator_dev
*rdev
= regulator
->rdev
;
2493 mutex_lock(&rdev
->mutex
);
2496 if (!rdev
->desc
->ops
->set_current_limit
) {
2501 /* constraints check */
2502 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2506 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2508 mutex_unlock(&rdev
->mutex
);
2511 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2513 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2517 mutex_lock(&rdev
->mutex
);
2520 if (!rdev
->desc
->ops
->get_current_limit
) {
2525 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2527 mutex_unlock(&rdev
->mutex
);
2532 * regulator_get_current_limit - get regulator output current
2533 * @regulator: regulator source
2535 * This returns the current supplied by the specified current sink in uA.
2537 * NOTE: If the regulator is disabled it will return the current value. This
2538 * function should not be used to determine regulator state.
2540 int regulator_get_current_limit(struct regulator
*regulator
)
2542 return _regulator_get_current_limit(regulator
->rdev
);
2544 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2547 * regulator_set_mode - set regulator operating mode
2548 * @regulator: regulator source
2549 * @mode: operating mode - one of the REGULATOR_MODE constants
2551 * Set regulator operating mode to increase regulator efficiency or improve
2552 * regulation performance.
2554 * NOTE: Regulator system constraints must be set for this regulator before
2555 * calling this function otherwise this call will fail.
2557 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2559 struct regulator_dev
*rdev
= regulator
->rdev
;
2561 int regulator_curr_mode
;
2563 mutex_lock(&rdev
->mutex
);
2566 if (!rdev
->desc
->ops
->set_mode
) {
2571 /* return if the same mode is requested */
2572 if (rdev
->desc
->ops
->get_mode
) {
2573 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2574 if (regulator_curr_mode
== mode
) {
2580 /* constraints check */
2581 ret
= regulator_mode_constrain(rdev
, &mode
);
2585 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2587 mutex_unlock(&rdev
->mutex
);
2590 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2592 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2596 mutex_lock(&rdev
->mutex
);
2599 if (!rdev
->desc
->ops
->get_mode
) {
2604 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2606 mutex_unlock(&rdev
->mutex
);
2611 * regulator_get_mode - get regulator operating mode
2612 * @regulator: regulator source
2614 * Get the current regulator operating mode.
2616 unsigned int regulator_get_mode(struct regulator
*regulator
)
2618 return _regulator_get_mode(regulator
->rdev
);
2620 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2623 * regulator_set_optimum_mode - set regulator optimum operating mode
2624 * @regulator: regulator source
2625 * @uA_load: load current
2627 * Notifies the regulator core of a new device load. This is then used by
2628 * DRMS (if enabled by constraints) to set the most efficient regulator
2629 * operating mode for the new regulator loading.
2631 * Consumer devices notify their supply regulator of the maximum power
2632 * they will require (can be taken from device datasheet in the power
2633 * consumption tables) when they change operational status and hence power
2634 * state. Examples of operational state changes that can affect power
2635 * consumption are :-
2637 * o Device is opened / closed.
2638 * o Device I/O is about to begin or has just finished.
2639 * o Device is idling in between work.
2641 * This information is also exported via sysfs to userspace.
2643 * DRMS will sum the total requested load on the regulator and change
2644 * to the most efficient operating mode if platform constraints allow.
2646 * Returns the new regulator mode or error.
2648 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
2650 struct regulator_dev
*rdev
= regulator
->rdev
;
2651 struct regulator
*consumer
;
2652 int ret
, output_uV
, input_uV
= 0, total_uA_load
= 0;
2656 input_uV
= regulator_get_voltage(rdev
->supply
);
2658 mutex_lock(&rdev
->mutex
);
2661 * first check to see if we can set modes at all, otherwise just
2662 * tell the consumer everything is OK.
2664 regulator
->uA_load
= uA_load
;
2665 ret
= regulator_check_drms(rdev
);
2671 if (!rdev
->desc
->ops
->get_optimum_mode
)
2675 * we can actually do this so any errors are indicators of
2676 * potential real failure.
2680 if (!rdev
->desc
->ops
->set_mode
)
2683 /* get output voltage */
2684 output_uV
= _regulator_get_voltage(rdev
);
2685 if (output_uV
<= 0) {
2686 rdev_err(rdev
, "invalid output voltage found\n");
2690 /* No supply? Use constraint voltage */
2692 input_uV
= rdev
->constraints
->input_uV
;
2693 if (input_uV
<= 0) {
2694 rdev_err(rdev
, "invalid input voltage found\n");
2698 /* calc total requested load for this regulator */
2699 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
2700 total_uA_load
+= consumer
->uA_load
;
2702 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
2703 input_uV
, output_uV
,
2705 ret
= regulator_mode_constrain(rdev
, &mode
);
2707 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2708 total_uA_load
, input_uV
, output_uV
);
2712 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2714 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
2719 mutex_unlock(&rdev
->mutex
);
2722 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
2725 * regulator_set_bypass_regmap - Default set_bypass() using regmap
2727 * @rdev: device to operate on.
2728 * @enable: state to set.
2730 int regulator_set_bypass_regmap(struct regulator_dev
*rdev
, bool enable
)
2735 val
= rdev
->desc
->bypass_mask
;
2739 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->bypass_reg
,
2740 rdev
->desc
->bypass_mask
, val
);
2742 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap
);
2745 * regulator_get_bypass_regmap - Default get_bypass() using regmap
2747 * @rdev: device to operate on.
2748 * @enable: current state.
2750 int regulator_get_bypass_regmap(struct regulator_dev
*rdev
, bool *enable
)
2755 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->bypass_reg
, &val
);
2759 *enable
= val
& rdev
->desc
->bypass_mask
;
2763 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap
);
2766 * regulator_allow_bypass - allow the regulator to go into bypass mode
2768 * @regulator: Regulator to configure
2769 * @allow: enable or disable bypass mode
2771 * Allow the regulator to go into bypass mode if all other consumers
2772 * for the regulator also enable bypass mode and the machine
2773 * constraints allow this. Bypass mode means that the regulator is
2774 * simply passing the input directly to the output with no regulation.
2776 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
2778 struct regulator_dev
*rdev
= regulator
->rdev
;
2781 if (!rdev
->desc
->ops
->set_bypass
)
2784 if (rdev
->constraints
&&
2785 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
2788 mutex_lock(&rdev
->mutex
);
2790 if (enable
&& !regulator
->bypass
) {
2791 rdev
->bypass_count
++;
2793 if (rdev
->bypass_count
== rdev
->open_count
) {
2794 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2796 rdev
->bypass_count
--;
2799 } else if (!enable
&& regulator
->bypass
) {
2800 rdev
->bypass_count
--;
2802 if (rdev
->bypass_count
!= rdev
->open_count
) {
2803 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2805 rdev
->bypass_count
++;
2810 regulator
->bypass
= enable
;
2812 mutex_unlock(&rdev
->mutex
);
2816 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
2819 * regulator_register_notifier - register regulator event notifier
2820 * @regulator: regulator source
2821 * @nb: notifier block
2823 * Register notifier block to receive regulator events.
2825 int regulator_register_notifier(struct regulator
*regulator
,
2826 struct notifier_block
*nb
)
2828 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
2831 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
2834 * regulator_unregister_notifier - unregister regulator event notifier
2835 * @regulator: regulator source
2836 * @nb: notifier block
2838 * Unregister regulator event notifier block.
2840 int regulator_unregister_notifier(struct regulator
*regulator
,
2841 struct notifier_block
*nb
)
2843 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
2846 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
2848 /* notify regulator consumers and downstream regulator consumers.
2849 * Note mutex must be held by caller.
2851 static void _notifier_call_chain(struct regulator_dev
*rdev
,
2852 unsigned long event
, void *data
)
2854 /* call rdev chain first */
2855 blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
2859 * regulator_bulk_get - get multiple regulator consumers
2861 * @dev: Device to supply
2862 * @num_consumers: Number of consumers to register
2863 * @consumers: Configuration of consumers; clients are stored here.
2865 * @return 0 on success, an errno on failure.
2867 * This helper function allows drivers to get several regulator
2868 * consumers in one operation. If any of the regulators cannot be
2869 * acquired then any regulators that were allocated will be freed
2870 * before returning to the caller.
2872 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
2873 struct regulator_bulk_data
*consumers
)
2878 for (i
= 0; i
< num_consumers
; i
++)
2879 consumers
[i
].consumer
= NULL
;
2881 for (i
= 0; i
< num_consumers
; i
++) {
2882 consumers
[i
].consumer
= regulator_get(dev
,
2883 consumers
[i
].supply
);
2884 if (IS_ERR(consumers
[i
].consumer
)) {
2885 ret
= PTR_ERR(consumers
[i
].consumer
);
2886 dev_err(dev
, "Failed to get supply '%s': %d\n",
2887 consumers
[i
].supply
, ret
);
2888 consumers
[i
].consumer
= NULL
;
2897 regulator_put(consumers
[i
].consumer
);
2901 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
2904 * devm_regulator_bulk_get - managed get multiple regulator consumers
2906 * @dev: Device to supply
2907 * @num_consumers: Number of consumers to register
2908 * @consumers: Configuration of consumers; clients are stored here.
2910 * @return 0 on success, an errno on failure.
2912 * This helper function allows drivers to get several regulator
2913 * consumers in one operation with management, the regulators will
2914 * automatically be freed when the device is unbound. If any of the
2915 * regulators cannot be acquired then any regulators that were
2916 * allocated will be freed before returning to the caller.
2918 int devm_regulator_bulk_get(struct device
*dev
, int num_consumers
,
2919 struct regulator_bulk_data
*consumers
)
2924 for (i
= 0; i
< num_consumers
; i
++)
2925 consumers
[i
].consumer
= NULL
;
2927 for (i
= 0; i
< num_consumers
; i
++) {
2928 consumers
[i
].consumer
= devm_regulator_get(dev
,
2929 consumers
[i
].supply
);
2930 if (IS_ERR(consumers
[i
].consumer
)) {
2931 ret
= PTR_ERR(consumers
[i
].consumer
);
2932 dev_err(dev
, "Failed to get supply '%s': %d\n",
2933 consumers
[i
].supply
, ret
);
2934 consumers
[i
].consumer
= NULL
;
2942 for (i
= 0; i
< num_consumers
&& consumers
[i
].consumer
; i
++)
2943 devm_regulator_put(consumers
[i
].consumer
);
2947 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get
);
2949 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
2951 struct regulator_bulk_data
*bulk
= data
;
2953 bulk
->ret
= regulator_enable(bulk
->consumer
);
2957 * regulator_bulk_enable - enable multiple regulator consumers
2959 * @num_consumers: Number of consumers
2960 * @consumers: Consumer data; clients are stored here.
2961 * @return 0 on success, an errno on failure
2963 * This convenience API allows consumers to enable multiple regulator
2964 * clients in a single API call. If any consumers cannot be enabled
2965 * then any others that were enabled will be disabled again prior to
2968 int regulator_bulk_enable(int num_consumers
,
2969 struct regulator_bulk_data
*consumers
)
2971 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
2975 for (i
= 0; i
< num_consumers
; i
++) {
2976 if (consumers
[i
].consumer
->always_on
)
2977 consumers
[i
].ret
= 0;
2979 async_schedule_domain(regulator_bulk_enable_async
,
2980 &consumers
[i
], &async_domain
);
2983 async_synchronize_full_domain(&async_domain
);
2985 /* If any consumer failed we need to unwind any that succeeded */
2986 for (i
= 0; i
< num_consumers
; i
++) {
2987 if (consumers
[i
].ret
!= 0) {
2988 ret
= consumers
[i
].ret
;
2996 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
, ret
);
2998 regulator_disable(consumers
[i
].consumer
);
3002 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3005 * regulator_bulk_disable - disable multiple regulator consumers
3007 * @num_consumers: Number of consumers
3008 * @consumers: Consumer data; clients are stored here.
3009 * @return 0 on success, an errno on failure
3011 * This convenience API allows consumers to disable multiple regulator
3012 * clients in a single API call. If any consumers cannot be disabled
3013 * then any others that were disabled will be enabled again prior to
3016 int regulator_bulk_disable(int num_consumers
,
3017 struct regulator_bulk_data
*consumers
)
3022 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3023 ret
= regulator_disable(consumers
[i
].consumer
);
3031 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3032 for (++i
; i
< num_consumers
; ++i
) {
3033 r
= regulator_enable(consumers
[i
].consumer
);
3035 pr_err("Failed to reename %s: %d\n",
3036 consumers
[i
].supply
, r
);
3041 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3044 * regulator_bulk_force_disable - force disable multiple regulator consumers
3046 * @num_consumers: Number of consumers
3047 * @consumers: Consumer data; clients are stored here.
3048 * @return 0 on success, an errno on failure
3050 * This convenience API allows consumers to forcibly disable multiple regulator
3051 * clients in a single API call.
3052 * NOTE: This should be used for situations when device damage will
3053 * likely occur if the regulators are not disabled (e.g. over temp).
3054 * Although regulator_force_disable function call for some consumers can
3055 * return error numbers, the function is called for all consumers.
3057 int regulator_bulk_force_disable(int num_consumers
,
3058 struct regulator_bulk_data
*consumers
)
3063 for (i
= 0; i
< num_consumers
; i
++)
3065 regulator_force_disable(consumers
[i
].consumer
);
3067 for (i
= 0; i
< num_consumers
; i
++) {
3068 if (consumers
[i
].ret
!= 0) {
3069 ret
= consumers
[i
].ret
;
3078 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3081 * regulator_bulk_free - free multiple regulator consumers
3083 * @num_consumers: Number of consumers
3084 * @consumers: Consumer data; clients are stored here.
3086 * This convenience API allows consumers to free multiple regulator
3087 * clients in a single API call.
3089 void regulator_bulk_free(int num_consumers
,
3090 struct regulator_bulk_data
*consumers
)
3094 for (i
= 0; i
< num_consumers
; i
++) {
3095 regulator_put(consumers
[i
].consumer
);
3096 consumers
[i
].consumer
= NULL
;
3099 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3102 * regulator_notifier_call_chain - call regulator event notifier
3103 * @rdev: regulator source
3104 * @event: notifier block
3105 * @data: callback-specific data.
3107 * Called by regulator drivers to notify clients a regulator event has
3108 * occurred. We also notify regulator clients downstream.
3109 * Note lock must be held by caller.
3111 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3112 unsigned long event
, void *data
)
3114 _notifier_call_chain(rdev
, event
, data
);
3118 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3121 * regulator_mode_to_status - convert a regulator mode into a status
3123 * @mode: Mode to convert
3125 * Convert a regulator mode into a status.
3127 int regulator_mode_to_status(unsigned int mode
)
3130 case REGULATOR_MODE_FAST
:
3131 return REGULATOR_STATUS_FAST
;
3132 case REGULATOR_MODE_NORMAL
:
3133 return REGULATOR_STATUS_NORMAL
;
3134 case REGULATOR_MODE_IDLE
:
3135 return REGULATOR_STATUS_IDLE
;
3136 case REGULATOR_MODE_STANDBY
:
3137 return REGULATOR_STATUS_STANDBY
;
3139 return REGULATOR_STATUS_UNDEFINED
;
3142 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3145 * To avoid cluttering sysfs (and memory) with useless state, only
3146 * create attributes that can be meaningfully displayed.
3148 static int add_regulator_attributes(struct regulator_dev
*rdev
)
3150 struct device
*dev
= &rdev
->dev
;
3151 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3154 /* some attributes need specific methods to be displayed */
3155 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3156 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3157 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0)) {
3158 status
= device_create_file(dev
, &dev_attr_microvolts
);
3162 if (ops
->get_current_limit
) {
3163 status
= device_create_file(dev
, &dev_attr_microamps
);
3167 if (ops
->get_mode
) {
3168 status
= device_create_file(dev
, &dev_attr_opmode
);
3172 if (ops
->is_enabled
) {
3173 status
= device_create_file(dev
, &dev_attr_state
);
3177 if (ops
->get_status
) {
3178 status
= device_create_file(dev
, &dev_attr_status
);
3182 if (ops
->get_bypass
) {
3183 status
= device_create_file(dev
, &dev_attr_bypass
);
3188 /* some attributes are type-specific */
3189 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
3190 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
3195 /* all the other attributes exist to support constraints;
3196 * don't show them if there are no constraints, or if the
3197 * relevant supporting methods are missing.
3199 if (!rdev
->constraints
)
3202 /* constraints need specific supporting methods */
3203 if (ops
->set_voltage
|| ops
->set_voltage_sel
) {
3204 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
3207 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
3211 if (ops
->set_current_limit
) {
3212 status
= device_create_file(dev
, &dev_attr_min_microamps
);
3215 status
= device_create_file(dev
, &dev_attr_max_microamps
);
3220 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
3223 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
3226 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
3230 if (ops
->set_suspend_voltage
) {
3231 status
= device_create_file(dev
,
3232 &dev_attr_suspend_standby_microvolts
);
3235 status
= device_create_file(dev
,
3236 &dev_attr_suspend_mem_microvolts
);
3239 status
= device_create_file(dev
,
3240 &dev_attr_suspend_disk_microvolts
);
3245 if (ops
->set_suspend_mode
) {
3246 status
= device_create_file(dev
,
3247 &dev_attr_suspend_standby_mode
);
3250 status
= device_create_file(dev
,
3251 &dev_attr_suspend_mem_mode
);
3254 status
= device_create_file(dev
,
3255 &dev_attr_suspend_disk_mode
);
3263 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3265 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3266 if (!rdev
->debugfs
) {
3267 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3271 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3273 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3275 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3276 &rdev
->bypass_count
);
3280 * regulator_register - register regulator
3281 * @regulator_desc: regulator to register
3282 * @config: runtime configuration for regulator
3284 * Called by regulator drivers to register a regulator.
3285 * Returns 0 on success.
3287 struct regulator_dev
*
3288 regulator_register(const struct regulator_desc
*regulator_desc
,
3289 const struct regulator_config
*config
)
3291 const struct regulation_constraints
*constraints
= NULL
;
3292 const struct regulator_init_data
*init_data
;
3293 static atomic_t regulator_no
= ATOMIC_INIT(0);
3294 struct regulator_dev
*rdev
;
3297 const char *supply
= NULL
;
3299 if (regulator_desc
== NULL
|| config
== NULL
)
3300 return ERR_PTR(-EINVAL
);
3305 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3306 return ERR_PTR(-EINVAL
);
3308 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3309 regulator_desc
->type
!= REGULATOR_CURRENT
)
3310 return ERR_PTR(-EINVAL
);
3312 /* Only one of each should be implemented */
3313 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3314 regulator_desc
->ops
->get_voltage_sel
);
3315 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3316 regulator_desc
->ops
->set_voltage_sel
);
3318 /* If we're using selectors we must implement list_voltage. */
3319 if (regulator_desc
->ops
->get_voltage_sel
&&
3320 !regulator_desc
->ops
->list_voltage
) {
3321 return ERR_PTR(-EINVAL
);
3323 if (regulator_desc
->ops
->set_voltage_sel
&&
3324 !regulator_desc
->ops
->list_voltage
) {
3325 return ERR_PTR(-EINVAL
);
3328 init_data
= config
->init_data
;
3330 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3332 return ERR_PTR(-ENOMEM
);
3334 mutex_lock(®ulator_list_mutex
);
3336 mutex_init(&rdev
->mutex
);
3337 rdev
->reg_data
= config
->driver_data
;
3338 rdev
->owner
= regulator_desc
->owner
;
3339 rdev
->desc
= regulator_desc
;
3341 rdev
->regmap
= config
->regmap
;
3342 else if (dev_get_regmap(dev
, NULL
))
3343 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3344 else if (dev
->parent
)
3345 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
3346 INIT_LIST_HEAD(&rdev
->consumer_list
);
3347 INIT_LIST_HEAD(&rdev
->list
);
3348 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3349 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3351 /* preform any regulator specific init */
3352 if (init_data
&& init_data
->regulator_init
) {
3353 ret
= init_data
->regulator_init(rdev
->reg_data
);
3358 /* register with sysfs */
3359 rdev
->dev
.class = ®ulator_class
;
3360 rdev
->dev
.of_node
= config
->of_node
;
3361 rdev
->dev
.parent
= dev
;
3362 dev_set_name(&rdev
->dev
, "regulator.%d",
3363 atomic_inc_return(®ulator_no
) - 1);
3364 ret
= device_register(&rdev
->dev
);
3366 put_device(&rdev
->dev
);
3370 dev_set_drvdata(&rdev
->dev
, rdev
);
3372 if (config
->ena_gpio
&& gpio_is_valid(config
->ena_gpio
)) {
3373 ret
= gpio_request_one(config
->ena_gpio
,
3374 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
3375 rdev_get_name(rdev
));
3377 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3378 config
->ena_gpio
, ret
);
3382 rdev
->ena_gpio
= config
->ena_gpio
;
3383 rdev
->ena_gpio_invert
= config
->ena_gpio_invert
;
3385 if (config
->ena_gpio_flags
& GPIOF_OUT_INIT_HIGH
)
3386 rdev
->ena_gpio_state
= 1;
3388 if (rdev
->ena_gpio_invert
)
3389 rdev
->ena_gpio_state
= !rdev
->ena_gpio_state
;
3392 /* set regulator constraints */
3394 constraints
= &init_data
->constraints
;
3396 ret
= set_machine_constraints(rdev
, constraints
);
3400 /* add attributes supported by this regulator */
3401 ret
= add_regulator_attributes(rdev
);
3405 if (init_data
&& init_data
->supply_regulator
)
3406 supply
= init_data
->supply_regulator
;
3407 else if (regulator_desc
->supply_name
)
3408 supply
= regulator_desc
->supply_name
;
3411 struct regulator_dev
*r
;
3413 r
= regulator_dev_lookup(dev
, supply
, &ret
);
3416 dev_err(dev
, "Failed to find supply %s\n", supply
);
3417 ret
= -EPROBE_DEFER
;
3421 ret
= set_supply(rdev
, r
);
3425 /* Enable supply if rail is enabled */
3426 if (_regulator_is_enabled(rdev
)) {
3427 ret
= regulator_enable(rdev
->supply
);
3433 /* add consumers devices */
3435 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3436 ret
= set_consumer_device_supply(rdev
,
3437 init_data
->consumer_supplies
[i
].dev_name
,
3438 init_data
->consumer_supplies
[i
].supply
);
3440 dev_err(dev
, "Failed to set supply %s\n",
3441 init_data
->consumer_supplies
[i
].supply
);
3442 goto unset_supplies
;
3447 list_add(&rdev
->list
, ®ulator_list
);
3449 rdev_init_debugfs(rdev
);
3451 mutex_unlock(®ulator_list_mutex
);
3455 unset_regulator_supplies(rdev
);
3459 _regulator_put(rdev
->supply
);
3461 gpio_free(rdev
->ena_gpio
);
3462 kfree(rdev
->constraints
);
3464 device_unregister(&rdev
->dev
);
3465 /* device core frees rdev */
3466 rdev
= ERR_PTR(ret
);
3471 rdev
= ERR_PTR(ret
);
3474 EXPORT_SYMBOL_GPL(regulator_register
);
3477 * regulator_unregister - unregister regulator
3478 * @rdev: regulator to unregister
3480 * Called by regulator drivers to unregister a regulator.
3482 void regulator_unregister(struct regulator_dev
*rdev
)
3488 regulator_put(rdev
->supply
);
3489 mutex_lock(®ulator_list_mutex
);
3490 debugfs_remove_recursive(rdev
->debugfs
);
3491 flush_work(&rdev
->disable_work
.work
);
3492 WARN_ON(rdev
->open_count
);
3493 unset_regulator_supplies(rdev
);
3494 list_del(&rdev
->list
);
3495 kfree(rdev
->constraints
);
3497 gpio_free(rdev
->ena_gpio
);
3498 device_unregister(&rdev
->dev
);
3499 mutex_unlock(®ulator_list_mutex
);
3501 EXPORT_SYMBOL_GPL(regulator_unregister
);
3504 * regulator_suspend_prepare - prepare regulators for system wide suspend
3505 * @state: system suspend state
3507 * Configure each regulator with it's suspend operating parameters for state.
3508 * This will usually be called by machine suspend code prior to supending.
3510 int regulator_suspend_prepare(suspend_state_t state
)
3512 struct regulator_dev
*rdev
;
3515 /* ON is handled by regulator active state */
3516 if (state
== PM_SUSPEND_ON
)
3519 mutex_lock(®ulator_list_mutex
);
3520 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3522 mutex_lock(&rdev
->mutex
);
3523 ret
= suspend_prepare(rdev
, state
);
3524 mutex_unlock(&rdev
->mutex
);
3527 rdev_err(rdev
, "failed to prepare\n");
3532 mutex_unlock(®ulator_list_mutex
);
3535 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3538 * regulator_suspend_finish - resume regulators from system wide suspend
3540 * Turn on regulators that might be turned off by regulator_suspend_prepare
3541 * and that should be turned on according to the regulators properties.
3543 int regulator_suspend_finish(void)
3545 struct regulator_dev
*rdev
;
3548 mutex_lock(®ulator_list_mutex
);
3549 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3550 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3552 mutex_lock(&rdev
->mutex
);
3553 if ((rdev
->use_count
> 0 || rdev
->constraints
->always_on
) &&
3555 error
= ops
->enable(rdev
);
3559 if (!has_full_constraints
)
3563 if (!_regulator_is_enabled(rdev
))
3566 error
= ops
->disable(rdev
);
3571 mutex_unlock(&rdev
->mutex
);
3573 mutex_unlock(®ulator_list_mutex
);
3576 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3579 * regulator_has_full_constraints - the system has fully specified constraints
3581 * Calling this function will cause the regulator API to disable all
3582 * regulators which have a zero use count and don't have an always_on
3583 * constraint in a late_initcall.
3585 * The intention is that this will become the default behaviour in a
3586 * future kernel release so users are encouraged to use this facility
3589 void regulator_has_full_constraints(void)
3591 has_full_constraints
= 1;
3593 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3596 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3598 * Calling this function will cause the regulator API to provide a
3599 * dummy regulator to consumers if no physical regulator is found,
3600 * allowing most consumers to proceed as though a regulator were
3601 * configured. This allows systems such as those with software
3602 * controllable regulators for the CPU core only to be brought up more
3605 void regulator_use_dummy_regulator(void)
3607 board_wants_dummy_regulator
= true;
3609 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator
);
3612 * rdev_get_drvdata - get rdev regulator driver data
3615 * Get rdev regulator driver private data. This call can be used in the
3616 * regulator driver context.
3618 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3620 return rdev
->reg_data
;
3622 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3625 * regulator_get_drvdata - get regulator driver data
3626 * @regulator: regulator
3628 * Get regulator driver private data. This call can be used in the consumer
3629 * driver context when non API regulator specific functions need to be called.
3631 void *regulator_get_drvdata(struct regulator
*regulator
)
3633 return regulator
->rdev
->reg_data
;
3635 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3638 * regulator_set_drvdata - set regulator driver data
3639 * @regulator: regulator
3642 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3644 regulator
->rdev
->reg_data
= data
;
3646 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3649 * regulator_get_id - get regulator ID
3652 int rdev_get_id(struct regulator_dev
*rdev
)
3654 return rdev
->desc
->id
;
3656 EXPORT_SYMBOL_GPL(rdev_get_id
);
3658 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3662 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3664 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3666 return reg_init_data
->driver_data
;
3668 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3670 #ifdef CONFIG_DEBUG_FS
3671 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3672 size_t count
, loff_t
*ppos
)
3674 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3675 ssize_t len
, ret
= 0;
3676 struct regulator_map
*map
;
3681 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3682 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3684 rdev_get_name(map
->regulator
), map
->dev_name
,
3688 if (ret
> PAGE_SIZE
) {
3694 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3702 static const struct file_operations supply_map_fops
= {
3703 #ifdef CONFIG_DEBUG_FS
3704 .read
= supply_map_read_file
,
3705 .llseek
= default_llseek
,
3709 static int __init
regulator_init(void)
3713 ret
= class_register(®ulator_class
);
3715 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3717 pr_warn("regulator: Failed to create debugfs directory\n");
3719 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3722 regulator_dummy_init();
3727 /* init early to allow our consumers to complete system booting */
3728 core_initcall(regulator_init
);
3730 static int __init
regulator_init_complete(void)
3732 struct regulator_dev
*rdev
;
3733 struct regulator_ops
*ops
;
3734 struct regulation_constraints
*c
;
3738 * Since DT doesn't provide an idiomatic mechanism for
3739 * enabling full constraints and since it's much more natural
3740 * with DT to provide them just assume that a DT enabled
3741 * system has full constraints.
3743 if (of_have_populated_dt())
3744 has_full_constraints
= true;
3746 mutex_lock(®ulator_list_mutex
);
3748 /* If we have a full configuration then disable any regulators
3749 * which are not in use or always_on. This will become the
3750 * default behaviour in the future.
3752 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3753 ops
= rdev
->desc
->ops
;
3754 c
= rdev
->constraints
;
3756 if (!ops
->disable
|| (c
&& c
->always_on
))
3759 mutex_lock(&rdev
->mutex
);
3761 if (rdev
->use_count
)
3764 /* If we can't read the status assume it's on. */
3765 if (ops
->is_enabled
)
3766 enabled
= ops
->is_enabled(rdev
);
3773 if (has_full_constraints
) {
3774 /* We log since this may kill the system if it
3776 rdev_info(rdev
, "disabling\n");
3777 ret
= ops
->disable(rdev
);
3779 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
3782 /* The intention is that in future we will
3783 * assume that full constraints are provided
3784 * so warn even if we aren't going to do
3787 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
3791 mutex_unlock(&rdev
->mutex
);
3794 mutex_unlock(®ulator_list_mutex
);
3798 late_initcall(regulator_init_complete
);