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");
806 rdev_info(rdev
, "%s\n", buf
);
808 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
809 !(constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
))
811 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
814 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
815 struct regulation_constraints
*constraints
)
817 struct regulator_ops
*ops
= rdev
->desc
->ops
;
820 /* do we need to apply the constraint voltage */
821 if (rdev
->constraints
->apply_uV
&&
822 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
823 ret
= _regulator_do_set_voltage(rdev
,
824 rdev
->constraints
->min_uV
,
825 rdev
->constraints
->max_uV
);
827 rdev_err(rdev
, "failed to apply %duV constraint\n",
828 rdev
->constraints
->min_uV
);
833 /* constrain machine-level voltage specs to fit
834 * the actual range supported by this regulator.
836 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
837 int count
= rdev
->desc
->n_voltages
;
839 int min_uV
= INT_MAX
;
840 int max_uV
= INT_MIN
;
841 int cmin
= constraints
->min_uV
;
842 int cmax
= constraints
->max_uV
;
844 /* it's safe to autoconfigure fixed-voltage supplies
845 and the constraints are used by list_voltage. */
846 if (count
== 1 && !cmin
) {
849 constraints
->min_uV
= cmin
;
850 constraints
->max_uV
= cmax
;
853 /* voltage constraints are optional */
854 if ((cmin
== 0) && (cmax
== 0))
857 /* else require explicit machine-level constraints */
858 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
859 rdev_err(rdev
, "invalid voltage constraints\n");
863 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
864 for (i
= 0; i
< count
; i
++) {
867 value
= ops
->list_voltage(rdev
, i
);
871 /* maybe adjust [min_uV..max_uV] */
872 if (value
>= cmin
&& value
< min_uV
)
874 if (value
<= cmax
&& value
> max_uV
)
878 /* final: [min_uV..max_uV] valid iff constraints valid */
879 if (max_uV
< min_uV
) {
880 rdev_err(rdev
, "unsupportable voltage constraints\n");
884 /* use regulator's subset of machine constraints */
885 if (constraints
->min_uV
< min_uV
) {
886 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
887 constraints
->min_uV
, min_uV
);
888 constraints
->min_uV
= min_uV
;
890 if (constraints
->max_uV
> max_uV
) {
891 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
892 constraints
->max_uV
, max_uV
);
893 constraints
->max_uV
= max_uV
;
901 * set_machine_constraints - sets regulator constraints
902 * @rdev: regulator source
903 * @constraints: constraints to apply
905 * Allows platform initialisation code to define and constrain
906 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
907 * Constraints *must* be set by platform code in order for some
908 * regulator operations to proceed i.e. set_voltage, set_current_limit,
911 static int set_machine_constraints(struct regulator_dev
*rdev
,
912 const struct regulation_constraints
*constraints
)
915 struct regulator_ops
*ops
= rdev
->desc
->ops
;
918 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
921 rdev
->constraints
= kzalloc(sizeof(*constraints
),
923 if (!rdev
->constraints
)
926 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
930 /* do we need to setup our suspend state */
931 if (rdev
->constraints
->initial_state
) {
932 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
934 rdev_err(rdev
, "failed to set suspend state\n");
939 if (rdev
->constraints
->initial_mode
) {
940 if (!ops
->set_mode
) {
941 rdev_err(rdev
, "no set_mode operation\n");
946 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
948 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
953 /* If the constraints say the regulator should be on at this point
954 * and we have control then make sure it is enabled.
956 if ((rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) &&
958 ret
= ops
->enable(rdev
);
960 rdev_err(rdev
, "failed to enable\n");
965 if (rdev
->constraints
->ramp_delay
&& ops
->set_ramp_delay
) {
966 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
968 rdev_err(rdev
, "failed to set ramp_delay\n");
973 print_constraints(rdev
);
976 kfree(rdev
->constraints
);
977 rdev
->constraints
= NULL
;
982 * set_supply - set regulator supply regulator
983 * @rdev: regulator name
984 * @supply_rdev: supply regulator name
986 * Called by platform initialisation code to set the supply regulator for this
987 * regulator. This ensures that a regulators supply will also be enabled by the
988 * core if it's child is enabled.
990 static int set_supply(struct regulator_dev
*rdev
,
991 struct regulator_dev
*supply_rdev
)
995 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
997 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
998 if (rdev
->supply
== NULL
) {
1007 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1008 * @rdev: regulator source
1009 * @consumer_dev_name: dev_name() string for device supply applies to
1010 * @supply: symbolic name for supply
1012 * Allows platform initialisation code to map physical regulator
1013 * sources to symbolic names for supplies for use by devices. Devices
1014 * should use these symbolic names to request regulators, avoiding the
1015 * need to provide board-specific regulator names as platform data.
1017 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1018 const char *consumer_dev_name
,
1021 struct regulator_map
*node
;
1027 if (consumer_dev_name
!= NULL
)
1032 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1033 if (node
->dev_name
&& consumer_dev_name
) {
1034 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1036 } else if (node
->dev_name
|| consumer_dev_name
) {
1040 if (strcmp(node
->supply
, supply
) != 0)
1043 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1045 dev_name(&node
->regulator
->dev
),
1046 node
->regulator
->desc
->name
,
1048 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1052 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1056 node
->regulator
= rdev
;
1057 node
->supply
= supply
;
1060 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1061 if (node
->dev_name
== NULL
) {
1067 list_add(&node
->list
, ®ulator_map_list
);
1071 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1073 struct regulator_map
*node
, *n
;
1075 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1076 if (rdev
== node
->regulator
) {
1077 list_del(&node
->list
);
1078 kfree(node
->dev_name
);
1084 #define REG_STR_SIZE 64
1086 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1088 const char *supply_name
)
1090 struct regulator
*regulator
;
1091 char buf
[REG_STR_SIZE
];
1094 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1095 if (regulator
== NULL
)
1098 mutex_lock(&rdev
->mutex
);
1099 regulator
->rdev
= rdev
;
1100 list_add(®ulator
->list
, &rdev
->consumer_list
);
1103 regulator
->dev
= dev
;
1105 /* Add a link to the device sysfs entry */
1106 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1107 dev
->kobj
.name
, supply_name
);
1108 if (size
>= REG_STR_SIZE
)
1111 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1112 if (regulator
->supply_name
== NULL
)
1115 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1118 rdev_warn(rdev
, "could not add device link %s err %d\n",
1119 dev
->kobj
.name
, err
);
1123 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1124 if (regulator
->supply_name
== NULL
)
1128 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1130 if (!regulator
->debugfs
) {
1131 rdev_warn(rdev
, "Failed to create debugfs directory\n");
1133 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1134 ®ulator
->uA_load
);
1135 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1136 ®ulator
->min_uV
);
1137 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1138 ®ulator
->max_uV
);
1142 * Check now if the regulator is an always on regulator - if
1143 * it is then we don't need to do nearly so much work for
1144 * enable/disable calls.
1146 if (!_regulator_can_change_status(rdev
) &&
1147 _regulator_is_enabled(rdev
))
1148 regulator
->always_on
= true;
1150 mutex_unlock(&rdev
->mutex
);
1153 list_del(®ulator
->list
);
1155 mutex_unlock(&rdev
->mutex
);
1159 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1161 if (!rdev
->desc
->ops
->enable_time
)
1162 return rdev
->desc
->enable_time
;
1163 return rdev
->desc
->ops
->enable_time(rdev
);
1166 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1170 struct regulator_dev
*r
;
1171 struct device_node
*node
;
1172 struct regulator_map
*map
;
1173 const char *devname
= NULL
;
1175 /* first do a dt based lookup */
1176 if (dev
&& dev
->of_node
) {
1177 node
= of_get_regulator(dev
, supply
);
1179 list_for_each_entry(r
, ®ulator_list
, list
)
1180 if (r
->dev
.parent
&&
1181 node
== r
->dev
.of_node
)
1185 * If we couldn't even get the node then it's
1186 * not just that the device didn't register
1187 * yet, there's no node and we'll never
1194 /* if not found, try doing it non-dt way */
1196 devname
= dev_name(dev
);
1198 list_for_each_entry(r
, ®ulator_list
, list
)
1199 if (strcmp(rdev_get_name(r
), supply
) == 0)
1202 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1203 /* If the mapping has a device set up it must match */
1204 if (map
->dev_name
&&
1205 (!devname
|| strcmp(map
->dev_name
, devname
)))
1208 if (strcmp(map
->supply
, supply
) == 0)
1209 return map
->regulator
;
1216 /* Internal regulator request function */
1217 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1220 struct regulator_dev
*rdev
;
1221 struct regulator
*regulator
= ERR_PTR(-EPROBE_DEFER
);
1222 const char *devname
= NULL
;
1226 pr_err("get() with no identifier\n");
1231 devname
= dev_name(dev
);
1233 mutex_lock(®ulator_list_mutex
);
1235 rdev
= regulator_dev_lookup(dev
, id
, &ret
);
1239 if (board_wants_dummy_regulator
) {
1240 rdev
= dummy_regulator_rdev
;
1244 #ifdef CONFIG_REGULATOR_DUMMY
1246 devname
= "deviceless";
1248 /* If the board didn't flag that it was fully constrained then
1249 * substitute in a dummy regulator so consumers can continue.
1251 if (!has_full_constraints
) {
1252 pr_warn("%s supply %s not found, using dummy regulator\n",
1254 rdev
= dummy_regulator_rdev
;
1259 mutex_unlock(®ulator_list_mutex
);
1263 if (rdev
->exclusive
) {
1264 regulator
= ERR_PTR(-EPERM
);
1268 if (exclusive
&& rdev
->open_count
) {
1269 regulator
= ERR_PTR(-EBUSY
);
1273 if (!try_module_get(rdev
->owner
))
1276 regulator
= create_regulator(rdev
, dev
, id
);
1277 if (regulator
== NULL
) {
1278 regulator
= ERR_PTR(-ENOMEM
);
1279 module_put(rdev
->owner
);
1285 rdev
->exclusive
= 1;
1287 ret
= _regulator_is_enabled(rdev
);
1289 rdev
->use_count
= 1;
1291 rdev
->use_count
= 0;
1295 mutex_unlock(®ulator_list_mutex
);
1301 * regulator_get - lookup and obtain a reference to a regulator.
1302 * @dev: device for regulator "consumer"
1303 * @id: Supply name or regulator ID.
1305 * Returns a struct regulator corresponding to the regulator producer,
1306 * or IS_ERR() condition containing errno.
1308 * Use of supply names configured via regulator_set_device_supply() is
1309 * strongly encouraged. It is recommended that the supply name used
1310 * should match the name used for the supply and/or the relevant
1311 * device pins in the datasheet.
1313 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1315 return _regulator_get(dev
, id
, 0);
1317 EXPORT_SYMBOL_GPL(regulator_get
);
1319 static void devm_regulator_release(struct device
*dev
, void *res
)
1321 regulator_put(*(struct regulator
**)res
);
1325 * devm_regulator_get - Resource managed regulator_get()
1326 * @dev: device for regulator "consumer"
1327 * @id: Supply name or regulator ID.
1329 * Managed regulator_get(). Regulators returned from this function are
1330 * automatically regulator_put() on driver detach. See regulator_get() for more
1333 struct regulator
*devm_regulator_get(struct device
*dev
, const char *id
)
1335 struct regulator
**ptr
, *regulator
;
1337 ptr
= devres_alloc(devm_regulator_release
, sizeof(*ptr
), GFP_KERNEL
);
1339 return ERR_PTR(-ENOMEM
);
1341 regulator
= regulator_get(dev
, id
);
1342 if (!IS_ERR(regulator
)) {
1344 devres_add(dev
, ptr
);
1351 EXPORT_SYMBOL_GPL(devm_regulator_get
);
1354 * regulator_get_exclusive - obtain exclusive access to a regulator.
1355 * @dev: device for regulator "consumer"
1356 * @id: Supply name or regulator ID.
1358 * Returns a struct regulator corresponding to the regulator producer,
1359 * or IS_ERR() condition containing errno. Other consumers will be
1360 * unable to obtain this reference is held and the use count for the
1361 * regulator will be initialised to reflect the current state of the
1364 * This is intended for use by consumers which cannot tolerate shared
1365 * use of the regulator such as those which need to force the
1366 * regulator off for correct operation of the hardware they are
1369 * Use of supply names configured via regulator_set_device_supply() is
1370 * strongly encouraged. It is recommended that the supply name used
1371 * should match the name used for the supply and/or the relevant
1372 * device pins in the datasheet.
1374 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1376 return _regulator_get(dev
, id
, 1);
1378 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1381 * regulator_put - "free" the regulator source
1382 * @regulator: regulator source
1384 * Note: drivers must ensure that all regulator_enable calls made on this
1385 * regulator source are balanced by regulator_disable calls prior to calling
1388 void regulator_put(struct regulator
*regulator
)
1390 struct regulator_dev
*rdev
;
1392 if (regulator
== NULL
|| IS_ERR(regulator
))
1395 mutex_lock(®ulator_list_mutex
);
1396 rdev
= regulator
->rdev
;
1398 debugfs_remove_recursive(regulator
->debugfs
);
1400 /* remove any sysfs entries */
1402 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1403 kfree(regulator
->supply_name
);
1404 list_del(®ulator
->list
);
1408 rdev
->exclusive
= 0;
1410 module_put(rdev
->owner
);
1411 mutex_unlock(®ulator_list_mutex
);
1413 EXPORT_SYMBOL_GPL(regulator_put
);
1415 static int devm_regulator_match(struct device
*dev
, void *res
, void *data
)
1417 struct regulator
**r
= res
;
1426 * devm_regulator_put - Resource managed regulator_put()
1427 * @regulator: regulator to free
1429 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1430 * this function will not need to be called and the resource management
1431 * code will ensure that the resource is freed.
1433 void devm_regulator_put(struct regulator
*regulator
)
1437 rc
= devres_release(regulator
->dev
, devm_regulator_release
,
1438 devm_regulator_match
, regulator
);
1442 EXPORT_SYMBOL_GPL(devm_regulator_put
);
1444 static int _regulator_do_enable(struct regulator_dev
*rdev
)
1448 /* Query before enabling in case configuration dependent. */
1449 ret
= _regulator_get_enable_time(rdev
);
1453 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
1457 trace_regulator_enable(rdev_get_name(rdev
));
1459 if (rdev
->ena_gpio
) {
1460 gpio_set_value_cansleep(rdev
->ena_gpio
,
1461 !rdev
->ena_gpio_invert
);
1462 rdev
->ena_gpio_state
= 1;
1463 } else if (rdev
->desc
->ops
->enable
) {
1464 ret
= rdev
->desc
->ops
->enable(rdev
);
1471 /* Allow the regulator to ramp; it would be useful to extend
1472 * this for bulk operations so that the regulators can ramp
1474 trace_regulator_enable_delay(rdev_get_name(rdev
));
1476 if (delay
>= 1000) {
1477 mdelay(delay
/ 1000);
1478 udelay(delay
% 1000);
1483 trace_regulator_enable_complete(rdev_get_name(rdev
));
1488 /* locks held by regulator_enable() */
1489 static int _regulator_enable(struct regulator_dev
*rdev
)
1493 /* check voltage and requested load before enabling */
1494 if (rdev
->constraints
&&
1495 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1496 drms_uA_update(rdev
);
1498 if (rdev
->use_count
== 0) {
1499 /* The regulator may on if it's not switchable or left on */
1500 ret
= _regulator_is_enabled(rdev
);
1501 if (ret
== -EINVAL
|| ret
== 0) {
1502 if (!_regulator_can_change_status(rdev
))
1505 ret
= _regulator_do_enable(rdev
);
1509 } else if (ret
< 0) {
1510 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1513 /* Fallthrough on positive return values - already enabled */
1522 * regulator_enable - enable regulator output
1523 * @regulator: regulator source
1525 * Request that the regulator be enabled with the regulator output at
1526 * the predefined voltage or current value. Calls to regulator_enable()
1527 * must be balanced with calls to regulator_disable().
1529 * NOTE: the output value can be set by other drivers, boot loader or may be
1530 * hardwired in the regulator.
1532 int regulator_enable(struct regulator
*regulator
)
1534 struct regulator_dev
*rdev
= regulator
->rdev
;
1537 if (regulator
->always_on
)
1541 ret
= regulator_enable(rdev
->supply
);
1546 mutex_lock(&rdev
->mutex
);
1547 ret
= _regulator_enable(rdev
);
1548 mutex_unlock(&rdev
->mutex
);
1550 if (ret
!= 0 && rdev
->supply
)
1551 regulator_disable(rdev
->supply
);
1555 EXPORT_SYMBOL_GPL(regulator_enable
);
1557 static int _regulator_do_disable(struct regulator_dev
*rdev
)
1561 trace_regulator_disable(rdev_get_name(rdev
));
1563 if (rdev
->ena_gpio
) {
1564 gpio_set_value_cansleep(rdev
->ena_gpio
,
1565 rdev
->ena_gpio_invert
);
1566 rdev
->ena_gpio_state
= 0;
1568 } else if (rdev
->desc
->ops
->disable
) {
1569 ret
= rdev
->desc
->ops
->disable(rdev
);
1574 trace_regulator_disable_complete(rdev_get_name(rdev
));
1576 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1581 /* locks held by regulator_disable() */
1582 static int _regulator_disable(struct regulator_dev
*rdev
)
1586 if (WARN(rdev
->use_count
<= 0,
1587 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1590 /* are we the last user and permitted to disable ? */
1591 if (rdev
->use_count
== 1 &&
1592 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1594 /* we are last user */
1595 if (_regulator_can_change_status(rdev
)) {
1596 ret
= _regulator_do_disable(rdev
);
1598 rdev_err(rdev
, "failed to disable\n");
1603 rdev
->use_count
= 0;
1604 } else if (rdev
->use_count
> 1) {
1606 if (rdev
->constraints
&&
1607 (rdev
->constraints
->valid_ops_mask
&
1608 REGULATOR_CHANGE_DRMS
))
1609 drms_uA_update(rdev
);
1618 * regulator_disable - disable regulator output
1619 * @regulator: regulator source
1621 * Disable the regulator output voltage or current. Calls to
1622 * regulator_enable() must be balanced with calls to
1623 * regulator_disable().
1625 * NOTE: this will only disable the regulator output if no other consumer
1626 * devices have it enabled, the regulator device supports disabling and
1627 * machine constraints permit this operation.
1629 int regulator_disable(struct regulator
*regulator
)
1631 struct regulator_dev
*rdev
= regulator
->rdev
;
1634 if (regulator
->always_on
)
1637 mutex_lock(&rdev
->mutex
);
1638 ret
= _regulator_disable(rdev
);
1639 mutex_unlock(&rdev
->mutex
);
1641 if (ret
== 0 && rdev
->supply
)
1642 regulator_disable(rdev
->supply
);
1646 EXPORT_SYMBOL_GPL(regulator_disable
);
1648 /* locks held by regulator_force_disable() */
1649 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1654 if (rdev
->desc
->ops
->disable
) {
1655 /* ah well, who wants to live forever... */
1656 ret
= rdev
->desc
->ops
->disable(rdev
);
1658 rdev_err(rdev
, "failed to force disable\n");
1661 /* notify other consumers that power has been forced off */
1662 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1663 REGULATOR_EVENT_DISABLE
, NULL
);
1670 * regulator_force_disable - force disable regulator output
1671 * @regulator: regulator source
1673 * Forcibly disable the regulator output voltage or current.
1674 * NOTE: this *will* disable the regulator output even if other consumer
1675 * devices have it enabled. This should be used for situations when device
1676 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1678 int regulator_force_disable(struct regulator
*regulator
)
1680 struct regulator_dev
*rdev
= regulator
->rdev
;
1683 mutex_lock(&rdev
->mutex
);
1684 regulator
->uA_load
= 0;
1685 ret
= _regulator_force_disable(regulator
->rdev
);
1686 mutex_unlock(&rdev
->mutex
);
1689 while (rdev
->open_count
--)
1690 regulator_disable(rdev
->supply
);
1694 EXPORT_SYMBOL_GPL(regulator_force_disable
);
1696 static void regulator_disable_work(struct work_struct
*work
)
1698 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
1702 mutex_lock(&rdev
->mutex
);
1704 BUG_ON(!rdev
->deferred_disables
);
1706 count
= rdev
->deferred_disables
;
1707 rdev
->deferred_disables
= 0;
1709 for (i
= 0; i
< count
; i
++) {
1710 ret
= _regulator_disable(rdev
);
1712 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
1715 mutex_unlock(&rdev
->mutex
);
1718 for (i
= 0; i
< count
; i
++) {
1719 ret
= regulator_disable(rdev
->supply
);
1722 "Supply disable failed: %d\n", ret
);
1729 * regulator_disable_deferred - disable regulator output with delay
1730 * @regulator: regulator source
1731 * @ms: miliseconds until the regulator is disabled
1733 * Execute regulator_disable() on the regulator after a delay. This
1734 * is intended for use with devices that require some time to quiesce.
1736 * NOTE: this will only disable the regulator output if no other consumer
1737 * devices have it enabled, the regulator device supports disabling and
1738 * machine constraints permit this operation.
1740 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
1742 struct regulator_dev
*rdev
= regulator
->rdev
;
1745 if (regulator
->always_on
)
1748 mutex_lock(&rdev
->mutex
);
1749 rdev
->deferred_disables
++;
1750 mutex_unlock(&rdev
->mutex
);
1752 ret
= schedule_delayed_work(&rdev
->disable_work
,
1753 msecs_to_jiffies(ms
));
1759 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
1762 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1764 * @rdev: regulator to operate on
1766 * Regulators that use regmap for their register I/O can set the
1767 * enable_reg and enable_mask fields in their descriptor and then use
1768 * this as their is_enabled operation, saving some code.
1770 int regulator_is_enabled_regmap(struct regulator_dev
*rdev
)
1775 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->enable_reg
, &val
);
1779 return (val
& rdev
->desc
->enable_mask
) != 0;
1781 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap
);
1784 * regulator_enable_regmap - standard enable() for regmap users
1786 * @rdev: regulator to operate on
1788 * Regulators that use regmap for their register I/O can set the
1789 * enable_reg and enable_mask fields in their descriptor and then use
1790 * this as their enable() operation, saving some code.
1792 int regulator_enable_regmap(struct regulator_dev
*rdev
)
1794 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1795 rdev
->desc
->enable_mask
,
1796 rdev
->desc
->enable_mask
);
1798 EXPORT_SYMBOL_GPL(regulator_enable_regmap
);
1801 * regulator_disable_regmap - standard disable() for regmap users
1803 * @rdev: regulator to operate on
1805 * Regulators that use regmap for their register I/O can set the
1806 * enable_reg and enable_mask fields in their descriptor and then use
1807 * this as their disable() operation, saving some code.
1809 int regulator_disable_regmap(struct regulator_dev
*rdev
)
1811 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->enable_reg
,
1812 rdev
->desc
->enable_mask
, 0);
1814 EXPORT_SYMBOL_GPL(regulator_disable_regmap
);
1816 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
1818 /* A GPIO control always takes precedence */
1820 return rdev
->ena_gpio_state
;
1822 /* If we don't know then assume that the regulator is always on */
1823 if (!rdev
->desc
->ops
->is_enabled
)
1826 return rdev
->desc
->ops
->is_enabled(rdev
);
1830 * regulator_is_enabled - is the regulator output enabled
1831 * @regulator: regulator source
1833 * Returns positive if the regulator driver backing the source/client
1834 * has requested that the device be enabled, zero if it hasn't, else a
1835 * negative errno code.
1837 * Note that the device backing this regulator handle can have multiple
1838 * users, so it might be enabled even if regulator_enable() was never
1839 * called for this particular source.
1841 int regulator_is_enabled(struct regulator
*regulator
)
1845 if (regulator
->always_on
)
1848 mutex_lock(®ulator
->rdev
->mutex
);
1849 ret
= _regulator_is_enabled(regulator
->rdev
);
1850 mutex_unlock(®ulator
->rdev
->mutex
);
1854 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
1857 * regulator_count_voltages - count regulator_list_voltage() selectors
1858 * @regulator: regulator source
1860 * Returns number of selectors, or negative errno. Selectors are
1861 * numbered starting at zero, and typically correspond to bitfields
1862 * in hardware registers.
1864 int regulator_count_voltages(struct regulator
*regulator
)
1866 struct regulator_dev
*rdev
= regulator
->rdev
;
1868 return rdev
->desc
->n_voltages
? : -EINVAL
;
1870 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
1873 * regulator_list_voltage_linear - List voltages with simple calculation
1875 * @rdev: Regulator device
1876 * @selector: Selector to convert into a voltage
1878 * Regulators with a simple linear mapping between voltages and
1879 * selectors can set min_uV and uV_step in the regulator descriptor
1880 * and then use this function as their list_voltage() operation,
1882 int regulator_list_voltage_linear(struct regulator_dev
*rdev
,
1883 unsigned int selector
)
1885 if (selector
>= rdev
->desc
->n_voltages
)
1888 return rdev
->desc
->min_uV
+ (rdev
->desc
->uV_step
* selector
);
1890 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear
);
1893 * regulator_list_voltage_table - List voltages with table based mapping
1895 * @rdev: Regulator device
1896 * @selector: Selector to convert into a voltage
1898 * Regulators with table based mapping between voltages and
1899 * selectors can set volt_table in the regulator descriptor
1900 * and then use this function as their list_voltage() operation.
1902 int regulator_list_voltage_table(struct regulator_dev
*rdev
,
1903 unsigned int selector
)
1905 if (!rdev
->desc
->volt_table
) {
1906 BUG_ON(!rdev
->desc
->volt_table
);
1910 if (selector
>= rdev
->desc
->n_voltages
)
1913 return rdev
->desc
->volt_table
[selector
];
1915 EXPORT_SYMBOL_GPL(regulator_list_voltage_table
);
1918 * regulator_list_voltage - enumerate supported voltages
1919 * @regulator: regulator source
1920 * @selector: identify voltage to list
1921 * Context: can sleep
1923 * Returns a voltage that can be passed to @regulator_set_voltage(),
1924 * zero if this selector code can't be used on this system, or a
1927 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
1929 struct regulator_dev
*rdev
= regulator
->rdev
;
1930 struct regulator_ops
*ops
= rdev
->desc
->ops
;
1933 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
1936 mutex_lock(&rdev
->mutex
);
1937 ret
= ops
->list_voltage(rdev
, selector
);
1938 mutex_unlock(&rdev
->mutex
);
1941 if (ret
< rdev
->constraints
->min_uV
)
1943 else if (ret
> rdev
->constraints
->max_uV
)
1949 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
1952 * regulator_is_supported_voltage - check if a voltage range can be supported
1954 * @regulator: Regulator to check.
1955 * @min_uV: Minimum required voltage in uV.
1956 * @max_uV: Maximum required voltage in uV.
1958 * Returns a boolean or a negative error code.
1960 int regulator_is_supported_voltage(struct regulator
*regulator
,
1961 int min_uV
, int max_uV
)
1963 struct regulator_dev
*rdev
= regulator
->rdev
;
1964 int i
, voltages
, ret
;
1966 /* If we can't change voltage check the current voltage */
1967 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
1968 ret
= regulator_get_voltage(regulator
);
1970 return (min_uV
>= ret
&& ret
<= max_uV
);
1975 ret
= regulator_count_voltages(regulator
);
1980 for (i
= 0; i
< voltages
; i
++) {
1981 ret
= regulator_list_voltage(regulator
, i
);
1983 if (ret
>= min_uV
&& ret
<= max_uV
)
1989 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
1992 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
1994 * @rdev: regulator to operate on
1996 * Regulators that use regmap for their register I/O can set the
1997 * vsel_reg and vsel_mask fields in their descriptor and then use this
1998 * as their get_voltage_vsel operation, saving some code.
2000 int regulator_get_voltage_sel_regmap(struct regulator_dev
*rdev
)
2005 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->vsel_reg
, &val
);
2009 val
&= rdev
->desc
->vsel_mask
;
2010 val
>>= ffs(rdev
->desc
->vsel_mask
) - 1;
2014 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap
);
2017 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2019 * @rdev: regulator to operate on
2020 * @sel: Selector to set
2022 * Regulators that use regmap for their register I/O can set the
2023 * vsel_reg and vsel_mask fields in their descriptor and then use this
2024 * as their set_voltage_vsel operation, saving some code.
2026 int regulator_set_voltage_sel_regmap(struct regulator_dev
*rdev
, unsigned sel
)
2028 sel
<<= ffs(rdev
->desc
->vsel_mask
) - 1;
2030 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->vsel_reg
,
2031 rdev
->desc
->vsel_mask
, sel
);
2033 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap
);
2036 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2038 * @rdev: Regulator to operate on
2039 * @min_uV: Lower bound for voltage
2040 * @max_uV: Upper bound for voltage
2042 * Drivers implementing set_voltage_sel() and list_voltage() can use
2043 * this as their map_voltage() operation. It will find a suitable
2044 * voltage by calling list_voltage() until it gets something in bounds
2045 * for the requested voltages.
2047 int regulator_map_voltage_iterate(struct regulator_dev
*rdev
,
2048 int min_uV
, int max_uV
)
2050 int best_val
= INT_MAX
;
2054 /* Find the smallest voltage that falls within the specified
2057 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2058 ret
= rdev
->desc
->ops
->list_voltage(rdev
, i
);
2062 if (ret
< best_val
&& ret
>= min_uV
&& ret
<= max_uV
) {
2068 if (best_val
!= INT_MAX
)
2073 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate
);
2076 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2078 * @rdev: Regulator to operate on
2079 * @min_uV: Lower bound for voltage
2080 * @max_uV: Upper bound for voltage
2082 * Drivers providing min_uV and uV_step in their regulator_desc can
2083 * use this as their map_voltage() operation.
2085 int regulator_map_voltage_linear(struct regulator_dev
*rdev
,
2086 int min_uV
, int max_uV
)
2090 /* Allow uV_step to be 0 for fixed voltage */
2091 if (rdev
->desc
->n_voltages
== 1 && rdev
->desc
->uV_step
== 0) {
2092 if (min_uV
<= rdev
->desc
->min_uV
&& rdev
->desc
->min_uV
<= max_uV
)
2098 if (!rdev
->desc
->uV_step
) {
2099 BUG_ON(!rdev
->desc
->uV_step
);
2103 if (min_uV
< rdev
->desc
->min_uV
)
2104 min_uV
= rdev
->desc
->min_uV
;
2106 ret
= DIV_ROUND_UP(min_uV
- rdev
->desc
->min_uV
, rdev
->desc
->uV_step
);
2110 /* Map back into a voltage to verify we're still in bounds */
2111 voltage
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2112 if (voltage
< min_uV
|| voltage
> max_uV
)
2117 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear
);
2119 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2120 int min_uV
, int max_uV
)
2125 unsigned int selector
;
2126 int old_selector
= -1;
2128 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2130 min_uV
+= rdev
->constraints
->uV_offset
;
2131 max_uV
+= rdev
->constraints
->uV_offset
;
2134 * If we can't obtain the old selector there is not enough
2135 * info to call set_voltage_time_sel().
2137 if (_regulator_is_enabled(rdev
) &&
2138 rdev
->desc
->ops
->set_voltage_time_sel
&&
2139 rdev
->desc
->ops
->get_voltage_sel
) {
2140 old_selector
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2141 if (old_selector
< 0)
2142 return old_selector
;
2145 if (rdev
->desc
->ops
->set_voltage
) {
2146 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
,
2150 if (rdev
->desc
->ops
->list_voltage
)
2151 best_val
= rdev
->desc
->ops
->list_voltage(rdev
,
2154 best_val
= _regulator_get_voltage(rdev
);
2157 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
2158 if (rdev
->desc
->ops
->map_voltage
) {
2159 ret
= rdev
->desc
->ops
->map_voltage(rdev
, min_uV
,
2162 if (rdev
->desc
->ops
->list_voltage
==
2163 regulator_list_voltage_linear
)
2164 ret
= regulator_map_voltage_linear(rdev
,
2167 ret
= regulator_map_voltage_iterate(rdev
,
2172 best_val
= rdev
->desc
->ops
->list_voltage(rdev
, ret
);
2173 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2175 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
,
2185 /* Call set_voltage_time_sel if successfully obtained old_selector */
2186 if (ret
== 0 && _regulator_is_enabled(rdev
) && old_selector
>= 0 &&
2187 rdev
->desc
->ops
->set_voltage_time_sel
) {
2189 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
2190 old_selector
, selector
);
2192 rdev_warn(rdev
, "set_voltage_time_sel() failed: %d\n",
2197 /* Insert any necessary delays */
2198 if (delay
>= 1000) {
2199 mdelay(delay
/ 1000);
2200 udelay(delay
% 1000);
2206 if (ret
== 0 && best_val
>= 0)
2207 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2210 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2216 * regulator_set_voltage - set regulator output voltage
2217 * @regulator: regulator source
2218 * @min_uV: Minimum required voltage in uV
2219 * @max_uV: Maximum acceptable voltage in uV
2221 * Sets a voltage regulator to the desired output voltage. This can be set
2222 * during any regulator state. IOW, regulator can be disabled or enabled.
2224 * If the regulator is enabled then the voltage will change to the new value
2225 * immediately otherwise if the regulator is disabled the regulator will
2226 * output at the new voltage when enabled.
2228 * NOTE: If the regulator is shared between several devices then the lowest
2229 * request voltage that meets the system constraints will be used.
2230 * Regulator system constraints must be set for this regulator before
2231 * calling this function otherwise this call will fail.
2233 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
2235 struct regulator_dev
*rdev
= regulator
->rdev
;
2238 mutex_lock(&rdev
->mutex
);
2240 /* If we're setting the same range as last time the change
2241 * should be a noop (some cpufreq implementations use the same
2242 * voltage for multiple frequencies, for example).
2244 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2248 if (!rdev
->desc
->ops
->set_voltage
&&
2249 !rdev
->desc
->ops
->set_voltage_sel
) {
2254 /* constraints check */
2255 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2258 regulator
->min_uV
= min_uV
;
2259 regulator
->max_uV
= max_uV
;
2261 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2265 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2268 mutex_unlock(&rdev
->mutex
);
2271 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
2274 * regulator_set_voltage_time - get raise/fall time
2275 * @regulator: regulator source
2276 * @old_uV: starting voltage in microvolts
2277 * @new_uV: target voltage in microvolts
2279 * Provided with the starting and ending voltage, this function attempts to
2280 * calculate the time in microseconds required to rise or fall to this new
2283 int regulator_set_voltage_time(struct regulator
*regulator
,
2284 int old_uV
, int new_uV
)
2286 struct regulator_dev
*rdev
= regulator
->rdev
;
2287 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2293 /* Currently requires operations to do this */
2294 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
2295 || !rdev
->desc
->n_voltages
)
2298 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
2299 /* We only look for exact voltage matches here */
2300 voltage
= regulator_list_voltage(regulator
, i
);
2305 if (voltage
== old_uV
)
2307 if (voltage
== new_uV
)
2311 if (old_sel
< 0 || new_sel
< 0)
2314 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
2316 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
2319 *regulator_set_voltage_time_sel - get raise/fall time
2320 * @regulator: regulator source
2321 * @old_selector: selector for starting voltage
2322 * @new_selector: selector for target voltage
2324 * Provided with the starting and target voltage selectors, this function
2325 * returns time in microseconds required to rise or fall to this new voltage
2327 * Drivers providing ramp_delay in regulation_constraints can use this as their
2328 * set_voltage_time_sel() operation.
2330 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
2331 unsigned int old_selector
,
2332 unsigned int new_selector
)
2334 unsigned int ramp_delay
= 0;
2335 int old_volt
, new_volt
;
2337 if (rdev
->constraints
->ramp_delay
)
2338 ramp_delay
= rdev
->constraints
->ramp_delay
;
2339 else if (rdev
->desc
->ramp_delay
)
2340 ramp_delay
= rdev
->desc
->ramp_delay
;
2342 if (ramp_delay
== 0) {
2343 rdev_warn(rdev
, "ramp_delay not set\n");
2348 if (!rdev
->desc
->ops
->list_voltage
)
2351 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
2352 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
2354 return DIV_ROUND_UP(abs(new_volt
- old_volt
), ramp_delay
);
2356 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
2359 * regulator_sync_voltage - re-apply last regulator output voltage
2360 * @regulator: regulator source
2362 * Re-apply the last configured voltage. This is intended to be used
2363 * where some external control source the consumer is cooperating with
2364 * has caused the configured voltage to change.
2366 int regulator_sync_voltage(struct regulator
*regulator
)
2368 struct regulator_dev
*rdev
= regulator
->rdev
;
2369 int ret
, min_uV
, max_uV
;
2371 mutex_lock(&rdev
->mutex
);
2373 if (!rdev
->desc
->ops
->set_voltage
&&
2374 !rdev
->desc
->ops
->set_voltage_sel
) {
2379 /* This is only going to work if we've had a voltage configured. */
2380 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
2385 min_uV
= regulator
->min_uV
;
2386 max_uV
= regulator
->max_uV
;
2388 /* This should be a paranoia check... */
2389 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2393 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2397 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2400 mutex_unlock(&rdev
->mutex
);
2403 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
2405 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
2409 if (rdev
->desc
->ops
->get_voltage_sel
) {
2410 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
2413 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
2414 } else if (rdev
->desc
->ops
->get_voltage
) {
2415 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
2422 return ret
- rdev
->constraints
->uV_offset
;
2426 * regulator_get_voltage - get regulator output voltage
2427 * @regulator: regulator source
2429 * This returns the current regulator voltage in uV.
2431 * NOTE: If the regulator is disabled it will return the voltage value. This
2432 * function should not be used to determine regulator state.
2434 int regulator_get_voltage(struct regulator
*regulator
)
2438 mutex_lock(®ulator
->rdev
->mutex
);
2440 ret
= _regulator_get_voltage(regulator
->rdev
);
2442 mutex_unlock(®ulator
->rdev
->mutex
);
2446 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
2449 * regulator_set_current_limit - set regulator output current limit
2450 * @regulator: regulator source
2451 * @min_uA: Minimuum supported current in uA
2452 * @max_uA: Maximum supported current in uA
2454 * Sets current sink to the desired output current. This can be set during
2455 * any regulator state. IOW, regulator can be disabled or enabled.
2457 * If the regulator is enabled then the current will change to the new value
2458 * immediately otherwise if the regulator is disabled the regulator will
2459 * output at the new current when enabled.
2461 * NOTE: Regulator system constraints must be set for this regulator before
2462 * calling this function otherwise this call will fail.
2464 int regulator_set_current_limit(struct regulator
*regulator
,
2465 int min_uA
, int max_uA
)
2467 struct regulator_dev
*rdev
= regulator
->rdev
;
2470 mutex_lock(&rdev
->mutex
);
2473 if (!rdev
->desc
->ops
->set_current_limit
) {
2478 /* constraints check */
2479 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
2483 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
2485 mutex_unlock(&rdev
->mutex
);
2488 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
2490 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
2494 mutex_lock(&rdev
->mutex
);
2497 if (!rdev
->desc
->ops
->get_current_limit
) {
2502 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
2504 mutex_unlock(&rdev
->mutex
);
2509 * regulator_get_current_limit - get regulator output current
2510 * @regulator: regulator source
2512 * This returns the current supplied by the specified current sink in uA.
2514 * NOTE: If the regulator is disabled it will return the current value. This
2515 * function should not be used to determine regulator state.
2517 int regulator_get_current_limit(struct regulator
*regulator
)
2519 return _regulator_get_current_limit(regulator
->rdev
);
2521 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
2524 * regulator_set_mode - set regulator operating mode
2525 * @regulator: regulator source
2526 * @mode: operating mode - one of the REGULATOR_MODE constants
2528 * Set regulator operating mode to increase regulator efficiency or improve
2529 * regulation performance.
2531 * NOTE: Regulator system constraints must be set for this regulator before
2532 * calling this function otherwise this call will fail.
2534 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2536 struct regulator_dev
*rdev
= regulator
->rdev
;
2538 int regulator_curr_mode
;
2540 mutex_lock(&rdev
->mutex
);
2543 if (!rdev
->desc
->ops
->set_mode
) {
2548 /* return if the same mode is requested */
2549 if (rdev
->desc
->ops
->get_mode
) {
2550 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2551 if (regulator_curr_mode
== mode
) {
2557 /* constraints check */
2558 ret
= regulator_mode_constrain(rdev
, &mode
);
2562 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2564 mutex_unlock(&rdev
->mutex
);
2567 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2569 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2573 mutex_lock(&rdev
->mutex
);
2576 if (!rdev
->desc
->ops
->get_mode
) {
2581 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2583 mutex_unlock(&rdev
->mutex
);
2588 * regulator_get_mode - get regulator operating mode
2589 * @regulator: regulator source
2591 * Get the current regulator operating mode.
2593 unsigned int regulator_get_mode(struct regulator
*regulator
)
2595 return _regulator_get_mode(regulator
->rdev
);
2597 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2600 * regulator_set_optimum_mode - set regulator optimum operating mode
2601 * @regulator: regulator source
2602 * @uA_load: load current
2604 * Notifies the regulator core of a new device load. This is then used by
2605 * DRMS (if enabled by constraints) to set the most efficient regulator
2606 * operating mode for the new regulator loading.
2608 * Consumer devices notify their supply regulator of the maximum power
2609 * they will require (can be taken from device datasheet in the power
2610 * consumption tables) when they change operational status and hence power
2611 * state. Examples of operational state changes that can affect power
2612 * consumption are :-
2614 * o Device is opened / closed.
2615 * o Device I/O is about to begin or has just finished.
2616 * o Device is idling in between work.
2618 * This information is also exported via sysfs to userspace.
2620 * DRMS will sum the total requested load on the regulator and change
2621 * to the most efficient operating mode if platform constraints allow.
2623 * Returns the new regulator mode or error.
2625 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
2627 struct regulator_dev
*rdev
= regulator
->rdev
;
2628 struct regulator
*consumer
;
2629 int ret
, output_uV
, input_uV
= 0, total_uA_load
= 0;
2633 input_uV
= regulator_get_voltage(rdev
->supply
);
2635 mutex_lock(&rdev
->mutex
);
2638 * first check to see if we can set modes at all, otherwise just
2639 * tell the consumer everything is OK.
2641 regulator
->uA_load
= uA_load
;
2642 ret
= regulator_check_drms(rdev
);
2648 if (!rdev
->desc
->ops
->get_optimum_mode
)
2652 * we can actually do this so any errors are indicators of
2653 * potential real failure.
2657 if (!rdev
->desc
->ops
->set_mode
)
2660 /* get output voltage */
2661 output_uV
= _regulator_get_voltage(rdev
);
2662 if (output_uV
<= 0) {
2663 rdev_err(rdev
, "invalid output voltage found\n");
2667 /* No supply? Use constraint voltage */
2669 input_uV
= rdev
->constraints
->input_uV
;
2670 if (input_uV
<= 0) {
2671 rdev_err(rdev
, "invalid input voltage found\n");
2675 /* calc total requested load for this regulator */
2676 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
2677 total_uA_load
+= consumer
->uA_load
;
2679 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
2680 input_uV
, output_uV
,
2682 ret
= regulator_mode_constrain(rdev
, &mode
);
2684 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2685 total_uA_load
, input_uV
, output_uV
);
2689 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2691 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
2696 mutex_unlock(&rdev
->mutex
);
2699 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
2702 * regulator_set_bypass_regmap - Default set_bypass() using regmap
2704 * @rdev: device to operate on.
2705 * @enable: state to set.
2707 int regulator_set_bypass_regmap(struct regulator_dev
*rdev
, bool enable
)
2712 val
= rdev
->desc
->bypass_mask
;
2716 return regmap_update_bits(rdev
->regmap
, rdev
->desc
->bypass_reg
,
2717 rdev
->desc
->bypass_mask
, val
);
2719 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap
);
2722 * regulator_get_bypass_regmap - Default get_bypass() using regmap
2724 * @rdev: device to operate on.
2725 * @enable: current state.
2727 int regulator_get_bypass_regmap(struct regulator_dev
*rdev
, bool *enable
)
2732 ret
= regmap_read(rdev
->regmap
, rdev
->desc
->bypass_reg
, &val
);
2736 *enable
= val
& rdev
->desc
->bypass_mask
;
2740 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap
);
2743 * regulator_allow_bypass - allow the regulator to go into bypass mode
2745 * @regulator: Regulator to configure
2746 * @allow: enable or disable bypass mode
2748 * Allow the regulator to go into bypass mode if all other consumers
2749 * for the regulator also enable bypass mode and the machine
2750 * constraints allow this. Bypass mode means that the regulator is
2751 * simply passing the input directly to the output with no regulation.
2753 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
2755 struct regulator_dev
*rdev
= regulator
->rdev
;
2758 if (!rdev
->desc
->ops
->set_bypass
)
2761 if (rdev
->constraints
&&
2762 !(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_BYPASS
))
2765 mutex_lock(&rdev
->mutex
);
2767 if (enable
&& !regulator
->bypass
) {
2768 rdev
->bypass_count
++;
2770 if (rdev
->bypass_count
== rdev
->open_count
) {
2771 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2773 rdev
->bypass_count
--;
2776 } else if (!enable
&& regulator
->bypass
) {
2777 rdev
->bypass_count
--;
2779 if (rdev
->bypass_count
!= rdev
->open_count
) {
2780 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
2782 rdev
->bypass_count
++;
2787 regulator
->bypass
= enable
;
2789 mutex_unlock(&rdev
->mutex
);
2793 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
2796 * regulator_register_notifier - register regulator event notifier
2797 * @regulator: regulator source
2798 * @nb: notifier block
2800 * Register notifier block to receive regulator events.
2802 int regulator_register_notifier(struct regulator
*regulator
,
2803 struct notifier_block
*nb
)
2805 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
2808 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
2811 * regulator_unregister_notifier - unregister regulator event notifier
2812 * @regulator: regulator source
2813 * @nb: notifier block
2815 * Unregister regulator event notifier block.
2817 int regulator_unregister_notifier(struct regulator
*regulator
,
2818 struct notifier_block
*nb
)
2820 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
2823 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
2825 /* notify regulator consumers and downstream regulator consumers.
2826 * Note mutex must be held by caller.
2828 static void _notifier_call_chain(struct regulator_dev
*rdev
,
2829 unsigned long event
, void *data
)
2831 /* call rdev chain first */
2832 blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
2836 * regulator_bulk_get - get multiple regulator consumers
2838 * @dev: Device to supply
2839 * @num_consumers: Number of consumers to register
2840 * @consumers: Configuration of consumers; clients are stored here.
2842 * @return 0 on success, an errno on failure.
2844 * This helper function allows drivers to get several regulator
2845 * consumers in one operation. If any of the regulators cannot be
2846 * acquired then any regulators that were allocated will be freed
2847 * before returning to the caller.
2849 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
2850 struct regulator_bulk_data
*consumers
)
2855 for (i
= 0; i
< num_consumers
; i
++)
2856 consumers
[i
].consumer
= NULL
;
2858 for (i
= 0; i
< num_consumers
; i
++) {
2859 consumers
[i
].consumer
= regulator_get(dev
,
2860 consumers
[i
].supply
);
2861 if (IS_ERR(consumers
[i
].consumer
)) {
2862 ret
= PTR_ERR(consumers
[i
].consumer
);
2863 dev_err(dev
, "Failed to get supply '%s': %d\n",
2864 consumers
[i
].supply
, ret
);
2865 consumers
[i
].consumer
= NULL
;
2874 regulator_put(consumers
[i
].consumer
);
2878 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
2881 * devm_regulator_bulk_get - managed get multiple regulator consumers
2883 * @dev: Device to supply
2884 * @num_consumers: Number of consumers to register
2885 * @consumers: Configuration of consumers; clients are stored here.
2887 * @return 0 on success, an errno on failure.
2889 * This helper function allows drivers to get several regulator
2890 * consumers in one operation with management, the regulators will
2891 * automatically be freed when the device is unbound. If any of the
2892 * regulators cannot be acquired then any regulators that were
2893 * allocated will be freed before returning to the caller.
2895 int devm_regulator_bulk_get(struct device
*dev
, int num_consumers
,
2896 struct regulator_bulk_data
*consumers
)
2901 for (i
= 0; i
< num_consumers
; i
++)
2902 consumers
[i
].consumer
= NULL
;
2904 for (i
= 0; i
< num_consumers
; i
++) {
2905 consumers
[i
].consumer
= devm_regulator_get(dev
,
2906 consumers
[i
].supply
);
2907 if (IS_ERR(consumers
[i
].consumer
)) {
2908 ret
= PTR_ERR(consumers
[i
].consumer
);
2909 dev_err(dev
, "Failed to get supply '%s': %d\n",
2910 consumers
[i
].supply
, ret
);
2911 consumers
[i
].consumer
= NULL
;
2919 for (i
= 0; i
< num_consumers
&& consumers
[i
].consumer
; i
++)
2920 devm_regulator_put(consumers
[i
].consumer
);
2924 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get
);
2926 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
2928 struct regulator_bulk_data
*bulk
= data
;
2930 bulk
->ret
= regulator_enable(bulk
->consumer
);
2934 * regulator_bulk_enable - enable multiple regulator consumers
2936 * @num_consumers: Number of consumers
2937 * @consumers: Consumer data; clients are stored here.
2938 * @return 0 on success, an errno on failure
2940 * This convenience API allows consumers to enable multiple regulator
2941 * clients in a single API call. If any consumers cannot be enabled
2942 * then any others that were enabled will be disabled again prior to
2945 int regulator_bulk_enable(int num_consumers
,
2946 struct regulator_bulk_data
*consumers
)
2948 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
2952 for (i
= 0; i
< num_consumers
; i
++) {
2953 if (consumers
[i
].consumer
->always_on
)
2954 consumers
[i
].ret
= 0;
2956 async_schedule_domain(regulator_bulk_enable_async
,
2957 &consumers
[i
], &async_domain
);
2960 async_synchronize_full_domain(&async_domain
);
2962 /* If any consumer failed we need to unwind any that succeeded */
2963 for (i
= 0; i
< num_consumers
; i
++) {
2964 if (consumers
[i
].ret
!= 0) {
2965 ret
= consumers
[i
].ret
;
2973 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
, ret
);
2975 regulator_disable(consumers
[i
].consumer
);
2979 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
2982 * regulator_bulk_disable - disable multiple regulator consumers
2984 * @num_consumers: Number of consumers
2985 * @consumers: Consumer data; clients are stored here.
2986 * @return 0 on success, an errno on failure
2988 * This convenience API allows consumers to disable multiple regulator
2989 * clients in a single API call. If any consumers cannot be disabled
2990 * then any others that were disabled will be enabled again prior to
2993 int regulator_bulk_disable(int num_consumers
,
2994 struct regulator_bulk_data
*consumers
)
2999 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3000 ret
= regulator_disable(consumers
[i
].consumer
);
3008 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3009 for (++i
; i
< num_consumers
; ++i
) {
3010 r
= regulator_enable(consumers
[i
].consumer
);
3012 pr_err("Failed to reename %s: %d\n",
3013 consumers
[i
].supply
, r
);
3018 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3021 * regulator_bulk_force_disable - force disable multiple regulator consumers
3023 * @num_consumers: Number of consumers
3024 * @consumers: Consumer data; clients are stored here.
3025 * @return 0 on success, an errno on failure
3027 * This convenience API allows consumers to forcibly disable multiple regulator
3028 * clients in a single API call.
3029 * NOTE: This should be used for situations when device damage will
3030 * likely occur if the regulators are not disabled (e.g. over temp).
3031 * Although regulator_force_disable function call for some consumers can
3032 * return error numbers, the function is called for all consumers.
3034 int regulator_bulk_force_disable(int num_consumers
,
3035 struct regulator_bulk_data
*consumers
)
3040 for (i
= 0; i
< num_consumers
; i
++)
3042 regulator_force_disable(consumers
[i
].consumer
);
3044 for (i
= 0; i
< num_consumers
; i
++) {
3045 if (consumers
[i
].ret
!= 0) {
3046 ret
= consumers
[i
].ret
;
3055 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3058 * regulator_bulk_free - free multiple regulator consumers
3060 * @num_consumers: Number of consumers
3061 * @consumers: Consumer data; clients are stored here.
3063 * This convenience API allows consumers to free multiple regulator
3064 * clients in a single API call.
3066 void regulator_bulk_free(int num_consumers
,
3067 struct regulator_bulk_data
*consumers
)
3071 for (i
= 0; i
< num_consumers
; i
++) {
3072 regulator_put(consumers
[i
].consumer
);
3073 consumers
[i
].consumer
= NULL
;
3076 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3079 * regulator_notifier_call_chain - call regulator event notifier
3080 * @rdev: regulator source
3081 * @event: notifier block
3082 * @data: callback-specific data.
3084 * Called by regulator drivers to notify clients a regulator event has
3085 * occurred. We also notify regulator clients downstream.
3086 * Note lock must be held by caller.
3088 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3089 unsigned long event
, void *data
)
3091 _notifier_call_chain(rdev
, event
, data
);
3095 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3098 * regulator_mode_to_status - convert a regulator mode into a status
3100 * @mode: Mode to convert
3102 * Convert a regulator mode into a status.
3104 int regulator_mode_to_status(unsigned int mode
)
3107 case REGULATOR_MODE_FAST
:
3108 return REGULATOR_STATUS_FAST
;
3109 case REGULATOR_MODE_NORMAL
:
3110 return REGULATOR_STATUS_NORMAL
;
3111 case REGULATOR_MODE_IDLE
:
3112 return REGULATOR_STATUS_IDLE
;
3113 case REGULATOR_MODE_STANDBY
:
3114 return REGULATOR_STATUS_STANDBY
;
3116 return REGULATOR_STATUS_UNDEFINED
;
3119 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3122 * To avoid cluttering sysfs (and memory) with useless state, only
3123 * create attributes that can be meaningfully displayed.
3125 static int add_regulator_attributes(struct regulator_dev
*rdev
)
3127 struct device
*dev
= &rdev
->dev
;
3128 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3131 /* some attributes need specific methods to be displayed */
3132 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3133 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0)) {
3134 status
= device_create_file(dev
, &dev_attr_microvolts
);
3138 if (ops
->get_current_limit
) {
3139 status
= device_create_file(dev
, &dev_attr_microamps
);
3143 if (ops
->get_mode
) {
3144 status
= device_create_file(dev
, &dev_attr_opmode
);
3148 if (ops
->is_enabled
) {
3149 status
= device_create_file(dev
, &dev_attr_state
);
3153 if (ops
->get_status
) {
3154 status
= device_create_file(dev
, &dev_attr_status
);
3158 if (ops
->get_bypass
) {
3159 status
= device_create_file(dev
, &dev_attr_bypass
);
3164 /* some attributes are type-specific */
3165 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
3166 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
3171 /* all the other attributes exist to support constraints;
3172 * don't show them if there are no constraints, or if the
3173 * relevant supporting methods are missing.
3175 if (!rdev
->constraints
)
3178 /* constraints need specific supporting methods */
3179 if (ops
->set_voltage
|| ops
->set_voltage_sel
) {
3180 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
3183 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
3187 if (ops
->set_current_limit
) {
3188 status
= device_create_file(dev
, &dev_attr_min_microamps
);
3191 status
= device_create_file(dev
, &dev_attr_max_microamps
);
3196 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
3199 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
3202 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
3206 if (ops
->set_suspend_voltage
) {
3207 status
= device_create_file(dev
,
3208 &dev_attr_suspend_standby_microvolts
);
3211 status
= device_create_file(dev
,
3212 &dev_attr_suspend_mem_microvolts
);
3215 status
= device_create_file(dev
,
3216 &dev_attr_suspend_disk_microvolts
);
3221 if (ops
->set_suspend_mode
) {
3222 status
= device_create_file(dev
,
3223 &dev_attr_suspend_standby_mode
);
3226 status
= device_create_file(dev
,
3227 &dev_attr_suspend_mem_mode
);
3230 status
= device_create_file(dev
,
3231 &dev_attr_suspend_disk_mode
);
3239 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3241 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
3242 if (!rdev
->debugfs
) {
3243 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3247 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3249 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3251 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3252 &rdev
->bypass_count
);
3256 * regulator_register - register regulator
3257 * @regulator_desc: regulator to register
3258 * @config: runtime configuration for regulator
3260 * Called by regulator drivers to register a regulator.
3261 * Returns 0 on success.
3263 struct regulator_dev
*
3264 regulator_register(const struct regulator_desc
*regulator_desc
,
3265 const struct regulator_config
*config
)
3267 const struct regulation_constraints
*constraints
= NULL
;
3268 const struct regulator_init_data
*init_data
;
3269 static atomic_t regulator_no
= ATOMIC_INIT(0);
3270 struct regulator_dev
*rdev
;
3273 const char *supply
= NULL
;
3275 if (regulator_desc
== NULL
|| config
== NULL
)
3276 return ERR_PTR(-EINVAL
);
3281 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3282 return ERR_PTR(-EINVAL
);
3284 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3285 regulator_desc
->type
!= REGULATOR_CURRENT
)
3286 return ERR_PTR(-EINVAL
);
3288 /* Only one of each should be implemented */
3289 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3290 regulator_desc
->ops
->get_voltage_sel
);
3291 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3292 regulator_desc
->ops
->set_voltage_sel
);
3294 /* If we're using selectors we must implement list_voltage. */
3295 if (regulator_desc
->ops
->get_voltage_sel
&&
3296 !regulator_desc
->ops
->list_voltage
) {
3297 return ERR_PTR(-EINVAL
);
3299 if (regulator_desc
->ops
->set_voltage_sel
&&
3300 !regulator_desc
->ops
->list_voltage
) {
3301 return ERR_PTR(-EINVAL
);
3304 init_data
= config
->init_data
;
3306 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
3308 return ERR_PTR(-ENOMEM
);
3310 mutex_lock(®ulator_list_mutex
);
3312 mutex_init(&rdev
->mutex
);
3313 rdev
->reg_data
= config
->driver_data
;
3314 rdev
->owner
= regulator_desc
->owner
;
3315 rdev
->desc
= regulator_desc
;
3317 rdev
->regmap
= config
->regmap
;
3319 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
3320 INIT_LIST_HEAD(&rdev
->consumer_list
);
3321 INIT_LIST_HEAD(&rdev
->list
);
3322 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
3323 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
3325 /* preform any regulator specific init */
3326 if (init_data
&& init_data
->regulator_init
) {
3327 ret
= init_data
->regulator_init(rdev
->reg_data
);
3332 /* register with sysfs */
3333 rdev
->dev
.class = ®ulator_class
;
3334 rdev
->dev
.of_node
= config
->of_node
;
3335 rdev
->dev
.parent
= dev
;
3336 dev_set_name(&rdev
->dev
, "regulator.%d",
3337 atomic_inc_return(®ulator_no
) - 1);
3338 ret
= device_register(&rdev
->dev
);
3340 put_device(&rdev
->dev
);
3344 dev_set_drvdata(&rdev
->dev
, rdev
);
3346 if (config
->ena_gpio
&& gpio_is_valid(config
->ena_gpio
)) {
3347 ret
= gpio_request_one(config
->ena_gpio
,
3348 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
3349 rdev_get_name(rdev
));
3351 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
3352 config
->ena_gpio
, ret
);
3356 rdev
->ena_gpio
= config
->ena_gpio
;
3357 rdev
->ena_gpio_invert
= config
->ena_gpio_invert
;
3359 if (config
->ena_gpio_flags
& GPIOF_OUT_INIT_HIGH
)
3360 rdev
->ena_gpio_state
= 1;
3362 if (rdev
->ena_gpio_invert
)
3363 rdev
->ena_gpio_state
= !rdev
->ena_gpio_state
;
3366 /* set regulator constraints */
3368 constraints
= &init_data
->constraints
;
3370 ret
= set_machine_constraints(rdev
, constraints
);
3374 /* add attributes supported by this regulator */
3375 ret
= add_regulator_attributes(rdev
);
3379 if (init_data
&& init_data
->supply_regulator
)
3380 supply
= init_data
->supply_regulator
;
3381 else if (regulator_desc
->supply_name
)
3382 supply
= regulator_desc
->supply_name
;
3385 struct regulator_dev
*r
;
3387 r
= regulator_dev_lookup(dev
, supply
, &ret
);
3390 dev_err(dev
, "Failed to find supply %s\n", supply
);
3391 ret
= -EPROBE_DEFER
;
3395 ret
= set_supply(rdev
, r
);
3399 /* Enable supply if rail is enabled */
3400 if (_regulator_is_enabled(rdev
)) {
3401 ret
= regulator_enable(rdev
->supply
);
3407 /* add consumers devices */
3409 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
3410 ret
= set_consumer_device_supply(rdev
,
3411 init_data
->consumer_supplies
[i
].dev_name
,
3412 init_data
->consumer_supplies
[i
].supply
);
3414 dev_err(dev
, "Failed to set supply %s\n",
3415 init_data
->consumer_supplies
[i
].supply
);
3416 goto unset_supplies
;
3421 list_add(&rdev
->list
, ®ulator_list
);
3423 rdev_init_debugfs(rdev
);
3425 mutex_unlock(®ulator_list_mutex
);
3429 unset_regulator_supplies(rdev
);
3433 regulator_put(rdev
->supply
);
3435 gpio_free(rdev
->ena_gpio
);
3436 kfree(rdev
->constraints
);
3437 device_unregister(&rdev
->dev
);
3438 /* device core frees rdev */
3439 rdev
= ERR_PTR(ret
);
3444 rdev
= ERR_PTR(ret
);
3447 EXPORT_SYMBOL_GPL(regulator_register
);
3450 * regulator_unregister - unregister regulator
3451 * @rdev: regulator to unregister
3453 * Called by regulator drivers to unregister a regulator.
3455 void regulator_unregister(struct regulator_dev
*rdev
)
3461 regulator_put(rdev
->supply
);
3462 mutex_lock(®ulator_list_mutex
);
3463 debugfs_remove_recursive(rdev
->debugfs
);
3464 flush_work_sync(&rdev
->disable_work
.work
);
3465 WARN_ON(rdev
->open_count
);
3466 unset_regulator_supplies(rdev
);
3467 list_del(&rdev
->list
);
3468 kfree(rdev
->constraints
);
3470 gpio_free(rdev
->ena_gpio
);
3471 device_unregister(&rdev
->dev
);
3472 mutex_unlock(®ulator_list_mutex
);
3474 EXPORT_SYMBOL_GPL(regulator_unregister
);
3477 * regulator_suspend_prepare - prepare regulators for system wide suspend
3478 * @state: system suspend state
3480 * Configure each regulator with it's suspend operating parameters for state.
3481 * This will usually be called by machine suspend code prior to supending.
3483 int regulator_suspend_prepare(suspend_state_t state
)
3485 struct regulator_dev
*rdev
;
3488 /* ON is handled by regulator active state */
3489 if (state
== PM_SUSPEND_ON
)
3492 mutex_lock(®ulator_list_mutex
);
3493 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3495 mutex_lock(&rdev
->mutex
);
3496 ret
= suspend_prepare(rdev
, state
);
3497 mutex_unlock(&rdev
->mutex
);
3500 rdev_err(rdev
, "failed to prepare\n");
3505 mutex_unlock(®ulator_list_mutex
);
3508 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
3511 * regulator_suspend_finish - resume regulators from system wide suspend
3513 * Turn on regulators that might be turned off by regulator_suspend_prepare
3514 * and that should be turned on according to the regulators properties.
3516 int regulator_suspend_finish(void)
3518 struct regulator_dev
*rdev
;
3521 mutex_lock(®ulator_list_mutex
);
3522 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3523 struct regulator_ops
*ops
= rdev
->desc
->ops
;
3525 mutex_lock(&rdev
->mutex
);
3526 if ((rdev
->use_count
> 0 || rdev
->constraints
->always_on
) &&
3528 error
= ops
->enable(rdev
);
3532 if (!has_full_constraints
)
3536 if (!_regulator_is_enabled(rdev
))
3539 error
= ops
->disable(rdev
);
3544 mutex_unlock(&rdev
->mutex
);
3546 mutex_unlock(®ulator_list_mutex
);
3549 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
3552 * regulator_has_full_constraints - the system has fully specified constraints
3554 * Calling this function will cause the regulator API to disable all
3555 * regulators which have a zero use count and don't have an always_on
3556 * constraint in a late_initcall.
3558 * The intention is that this will become the default behaviour in a
3559 * future kernel release so users are encouraged to use this facility
3562 void regulator_has_full_constraints(void)
3564 has_full_constraints
= 1;
3566 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
3569 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3571 * Calling this function will cause the regulator API to provide a
3572 * dummy regulator to consumers if no physical regulator is found,
3573 * allowing most consumers to proceed as though a regulator were
3574 * configured. This allows systems such as those with software
3575 * controllable regulators for the CPU core only to be brought up more
3578 void regulator_use_dummy_regulator(void)
3580 board_wants_dummy_regulator
= true;
3582 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator
);
3585 * rdev_get_drvdata - get rdev regulator driver data
3588 * Get rdev regulator driver private data. This call can be used in the
3589 * regulator driver context.
3591 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
3593 return rdev
->reg_data
;
3595 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
3598 * regulator_get_drvdata - get regulator driver data
3599 * @regulator: regulator
3601 * Get regulator driver private data. This call can be used in the consumer
3602 * driver context when non API regulator specific functions need to be called.
3604 void *regulator_get_drvdata(struct regulator
*regulator
)
3606 return regulator
->rdev
->reg_data
;
3608 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
3611 * regulator_set_drvdata - set regulator driver data
3612 * @regulator: regulator
3615 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
3617 regulator
->rdev
->reg_data
= data
;
3619 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
3622 * regulator_get_id - get regulator ID
3625 int rdev_get_id(struct regulator_dev
*rdev
)
3627 return rdev
->desc
->id
;
3629 EXPORT_SYMBOL_GPL(rdev_get_id
);
3631 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
3635 EXPORT_SYMBOL_GPL(rdev_get_dev
);
3637 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
3639 return reg_init_data
->driver_data
;
3641 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
3643 #ifdef CONFIG_DEBUG_FS
3644 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
3645 size_t count
, loff_t
*ppos
)
3647 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3648 ssize_t len
, ret
= 0;
3649 struct regulator_map
*map
;
3654 list_for_each_entry(map
, ®ulator_map_list
, list
) {
3655 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
3657 rdev_get_name(map
->regulator
), map
->dev_name
,
3661 if (ret
> PAGE_SIZE
) {
3667 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
3675 static const struct file_operations supply_map_fops
= {
3676 #ifdef CONFIG_DEBUG_FS
3677 .read
= supply_map_read_file
,
3678 .llseek
= default_llseek
,
3682 static int __init
regulator_init(void)
3686 ret
= class_register(®ulator_class
);
3688 debugfs_root
= debugfs_create_dir("regulator", NULL
);
3690 pr_warn("regulator: Failed to create debugfs directory\n");
3692 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
3695 regulator_dummy_init();
3700 /* init early to allow our consumers to complete system booting */
3701 core_initcall(regulator_init
);
3703 static int __init
regulator_init_complete(void)
3705 struct regulator_dev
*rdev
;
3706 struct regulator_ops
*ops
;
3707 struct regulation_constraints
*c
;
3711 * Since DT doesn't provide an idiomatic mechanism for
3712 * enabling full constraints and since it's much more natural
3713 * with DT to provide them just assume that a DT enabled
3714 * system has full constraints.
3716 if (of_have_populated_dt())
3717 has_full_constraints
= true;
3719 mutex_lock(®ulator_list_mutex
);
3721 /* If we have a full configuration then disable any regulators
3722 * which are not in use or always_on. This will become the
3723 * default behaviour in the future.
3725 list_for_each_entry(rdev
, ®ulator_list
, list
) {
3726 ops
= rdev
->desc
->ops
;
3727 c
= rdev
->constraints
;
3729 if (!ops
->disable
|| (c
&& c
->always_on
))
3732 mutex_lock(&rdev
->mutex
);
3734 if (rdev
->use_count
)
3737 /* If we can't read the status assume it's on. */
3738 if (ops
->is_enabled
)
3739 enabled
= ops
->is_enabled(rdev
);
3746 if (has_full_constraints
) {
3747 /* We log since this may kill the system if it
3749 rdev_info(rdev
, "disabling\n");
3750 ret
= ops
->disable(rdev
);
3752 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
3755 /* The intention is that in future we will
3756 * assume that full constraints are provided
3757 * so warn even if we aren't going to do
3760 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
3764 mutex_unlock(&rdev
->mutex
);
3767 mutex_unlock(®ulator_list_mutex
);
3771 late_initcall(regulator_init_complete
);