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 #define pr_fmt(fmt) "%s: " fmt, __func__
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <linux/debugfs.h>
21 #include <linux/device.h>
22 #include <linux/slab.h>
23 #include <linux/err.h>
24 #include <linux/mutex.h>
25 #include <linux/suspend.h>
26 #include <linux/delay.h>
27 #include <linux/regulator/consumer.h>
28 #include <linux/regulator/driver.h>
29 #include <linux/regulator/machine.h>
31 #define CREATE_TRACE_POINTS
32 #include <trace/events/regulator.h>
36 #define rdev_err(rdev, fmt, ...) \
37 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
38 #define rdev_warn(rdev, fmt, ...) \
39 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
40 #define rdev_info(rdev, fmt, ...) \
41 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
42 #define rdev_dbg(rdev, fmt, ...) \
43 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
45 static DEFINE_MUTEX(regulator_list_mutex
);
46 static LIST_HEAD(regulator_list
);
47 static LIST_HEAD(regulator_map_list
);
48 static bool has_full_constraints
;
49 static bool board_wants_dummy_regulator
;
51 #ifdef CONFIG_DEBUG_FS
52 static struct dentry
*debugfs_root
;
56 * struct regulator_map
58 * Used to provide symbolic supply names to devices.
60 struct regulator_map
{
61 struct list_head list
;
62 const char *dev_name
; /* The dev_name() for the consumer */
64 struct regulator_dev
*regulator
;
70 * One for each consumer device.
74 struct list_head list
;
79 struct device_attribute dev_attr
;
80 struct regulator_dev
*rdev
;
83 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
84 static int _regulator_disable(struct regulator_dev
*rdev
,
85 struct regulator_dev
**supply_rdev_ptr
);
86 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
87 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
88 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
89 static void _notifier_call_chain(struct regulator_dev
*rdev
,
90 unsigned long event
, void *data
);
91 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
92 int min_uV
, int max_uV
);
94 static const char *rdev_get_name(struct regulator_dev
*rdev
)
96 if (rdev
->constraints
&& rdev
->constraints
->name
)
97 return rdev
->constraints
->name
;
98 else if (rdev
->desc
->name
)
99 return rdev
->desc
->name
;
104 /* gets the regulator for a given consumer device */
105 static struct regulator
*get_device_regulator(struct device
*dev
)
107 struct regulator
*regulator
= NULL
;
108 struct regulator_dev
*rdev
;
110 mutex_lock(®ulator_list_mutex
);
111 list_for_each_entry(rdev
, ®ulator_list
, list
) {
112 mutex_lock(&rdev
->mutex
);
113 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
114 if (regulator
->dev
== dev
) {
115 mutex_unlock(&rdev
->mutex
);
116 mutex_unlock(®ulator_list_mutex
);
120 mutex_unlock(&rdev
->mutex
);
122 mutex_unlock(®ulator_list_mutex
);
126 /* Platform voltage constraint check */
127 static int regulator_check_voltage(struct regulator_dev
*rdev
,
128 int *min_uV
, int *max_uV
)
130 BUG_ON(*min_uV
> *max_uV
);
132 if (!rdev
->constraints
) {
133 rdev_err(rdev
, "no constraints\n");
136 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
137 rdev_err(rdev
, "operation not allowed\n");
141 if (*max_uV
> rdev
->constraints
->max_uV
)
142 *max_uV
= rdev
->constraints
->max_uV
;
143 if (*min_uV
< rdev
->constraints
->min_uV
)
144 *min_uV
= rdev
->constraints
->min_uV
;
146 if (*min_uV
> *max_uV
)
152 /* Make sure we select a voltage that suits the needs of all
153 * regulator consumers
155 static int regulator_check_consumers(struct regulator_dev
*rdev
,
156 int *min_uV
, int *max_uV
)
158 struct regulator
*regulator
;
160 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
161 if (*max_uV
> regulator
->max_uV
)
162 *max_uV
= regulator
->max_uV
;
163 if (*min_uV
< regulator
->min_uV
)
164 *min_uV
= regulator
->min_uV
;
167 if (*min_uV
> *max_uV
)
173 /* current constraint check */
174 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
175 int *min_uA
, int *max_uA
)
177 BUG_ON(*min_uA
> *max_uA
);
179 if (!rdev
->constraints
) {
180 rdev_err(rdev
, "no constraints\n");
183 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
184 rdev_err(rdev
, "operation not allowed\n");
188 if (*max_uA
> rdev
->constraints
->max_uA
)
189 *max_uA
= rdev
->constraints
->max_uA
;
190 if (*min_uA
< rdev
->constraints
->min_uA
)
191 *min_uA
= rdev
->constraints
->min_uA
;
193 if (*min_uA
> *max_uA
)
199 /* operating mode constraint check */
200 static int regulator_mode_constrain(struct regulator_dev
*rdev
, int *mode
)
203 case REGULATOR_MODE_FAST
:
204 case REGULATOR_MODE_NORMAL
:
205 case REGULATOR_MODE_IDLE
:
206 case REGULATOR_MODE_STANDBY
:
212 if (!rdev
->constraints
) {
213 rdev_err(rdev
, "no constraints\n");
216 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
217 rdev_err(rdev
, "operation not allowed\n");
221 /* The modes are bitmasks, the most power hungry modes having
222 * the lowest values. If the requested mode isn't supported
223 * try higher modes. */
225 if (rdev
->constraints
->valid_modes_mask
& *mode
)
233 /* dynamic regulator mode switching constraint check */
234 static int regulator_check_drms(struct regulator_dev
*rdev
)
236 if (!rdev
->constraints
) {
237 rdev_err(rdev
, "no constraints\n");
240 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
241 rdev_err(rdev
, "operation not allowed\n");
247 static ssize_t
device_requested_uA_show(struct device
*dev
,
248 struct device_attribute
*attr
, char *buf
)
250 struct regulator
*regulator
;
252 regulator
= get_device_regulator(dev
);
253 if (regulator
== NULL
)
256 return sprintf(buf
, "%d\n", regulator
->uA_load
);
259 static ssize_t
regulator_uV_show(struct device
*dev
,
260 struct device_attribute
*attr
, char *buf
)
262 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
265 mutex_lock(&rdev
->mutex
);
266 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
267 mutex_unlock(&rdev
->mutex
);
271 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
273 static ssize_t
regulator_uA_show(struct device
*dev
,
274 struct device_attribute
*attr
, char *buf
)
276 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
278 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
280 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
282 static ssize_t
regulator_name_show(struct device
*dev
,
283 struct device_attribute
*attr
, char *buf
)
285 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
287 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
290 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
293 case REGULATOR_MODE_FAST
:
294 return sprintf(buf
, "fast\n");
295 case REGULATOR_MODE_NORMAL
:
296 return sprintf(buf
, "normal\n");
297 case REGULATOR_MODE_IDLE
:
298 return sprintf(buf
, "idle\n");
299 case REGULATOR_MODE_STANDBY
:
300 return sprintf(buf
, "standby\n");
302 return sprintf(buf
, "unknown\n");
305 static ssize_t
regulator_opmode_show(struct device
*dev
,
306 struct device_attribute
*attr
, char *buf
)
308 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
310 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
312 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
314 static ssize_t
regulator_print_state(char *buf
, int state
)
317 return sprintf(buf
, "enabled\n");
319 return sprintf(buf
, "disabled\n");
321 return sprintf(buf
, "unknown\n");
324 static ssize_t
regulator_state_show(struct device
*dev
,
325 struct device_attribute
*attr
, char *buf
)
327 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
330 mutex_lock(&rdev
->mutex
);
331 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
332 mutex_unlock(&rdev
->mutex
);
336 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
338 static ssize_t
regulator_status_show(struct device
*dev
,
339 struct device_attribute
*attr
, char *buf
)
341 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
345 status
= rdev
->desc
->ops
->get_status(rdev
);
350 case REGULATOR_STATUS_OFF
:
353 case REGULATOR_STATUS_ON
:
356 case REGULATOR_STATUS_ERROR
:
359 case REGULATOR_STATUS_FAST
:
362 case REGULATOR_STATUS_NORMAL
:
365 case REGULATOR_STATUS_IDLE
:
368 case REGULATOR_STATUS_STANDBY
:
375 return sprintf(buf
, "%s\n", label
);
377 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
379 static ssize_t
regulator_min_uA_show(struct device
*dev
,
380 struct device_attribute
*attr
, char *buf
)
382 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
384 if (!rdev
->constraints
)
385 return sprintf(buf
, "constraint not defined\n");
387 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
389 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
391 static ssize_t
regulator_max_uA_show(struct device
*dev
,
392 struct device_attribute
*attr
, char *buf
)
394 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
396 if (!rdev
->constraints
)
397 return sprintf(buf
, "constraint not defined\n");
399 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
401 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
403 static ssize_t
regulator_min_uV_show(struct device
*dev
,
404 struct device_attribute
*attr
, char *buf
)
406 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
408 if (!rdev
->constraints
)
409 return sprintf(buf
, "constraint not defined\n");
411 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
413 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
415 static ssize_t
regulator_max_uV_show(struct device
*dev
,
416 struct device_attribute
*attr
, char *buf
)
418 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
420 if (!rdev
->constraints
)
421 return sprintf(buf
, "constraint not defined\n");
423 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
425 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
427 static ssize_t
regulator_total_uA_show(struct device
*dev
,
428 struct device_attribute
*attr
, char *buf
)
430 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
431 struct regulator
*regulator
;
434 mutex_lock(&rdev
->mutex
);
435 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
436 uA
+= regulator
->uA_load
;
437 mutex_unlock(&rdev
->mutex
);
438 return sprintf(buf
, "%d\n", uA
);
440 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
442 static ssize_t
regulator_num_users_show(struct device
*dev
,
443 struct device_attribute
*attr
, char *buf
)
445 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
446 return sprintf(buf
, "%d\n", rdev
->use_count
);
449 static ssize_t
regulator_type_show(struct device
*dev
,
450 struct device_attribute
*attr
, char *buf
)
452 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
454 switch (rdev
->desc
->type
) {
455 case REGULATOR_VOLTAGE
:
456 return sprintf(buf
, "voltage\n");
457 case REGULATOR_CURRENT
:
458 return sprintf(buf
, "current\n");
460 return sprintf(buf
, "unknown\n");
463 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
464 struct device_attribute
*attr
, char *buf
)
466 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
468 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
470 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
471 regulator_suspend_mem_uV_show
, NULL
);
473 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
474 struct device_attribute
*attr
, char *buf
)
476 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
478 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
480 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
481 regulator_suspend_disk_uV_show
, NULL
);
483 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
484 struct device_attribute
*attr
, char *buf
)
486 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
488 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
490 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
491 regulator_suspend_standby_uV_show
, NULL
);
493 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
494 struct device_attribute
*attr
, char *buf
)
496 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
498 return regulator_print_opmode(buf
,
499 rdev
->constraints
->state_mem
.mode
);
501 static DEVICE_ATTR(suspend_mem_mode
, 0444,
502 regulator_suspend_mem_mode_show
, NULL
);
504 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
505 struct device_attribute
*attr
, char *buf
)
507 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
509 return regulator_print_opmode(buf
,
510 rdev
->constraints
->state_disk
.mode
);
512 static DEVICE_ATTR(suspend_disk_mode
, 0444,
513 regulator_suspend_disk_mode_show
, NULL
);
515 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
516 struct device_attribute
*attr
, char *buf
)
518 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
520 return regulator_print_opmode(buf
,
521 rdev
->constraints
->state_standby
.mode
);
523 static DEVICE_ATTR(suspend_standby_mode
, 0444,
524 regulator_suspend_standby_mode_show
, NULL
);
526 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
527 struct device_attribute
*attr
, char *buf
)
529 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
531 return regulator_print_state(buf
,
532 rdev
->constraints
->state_mem
.enabled
);
534 static DEVICE_ATTR(suspend_mem_state
, 0444,
535 regulator_suspend_mem_state_show
, NULL
);
537 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
538 struct device_attribute
*attr
, char *buf
)
540 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
542 return regulator_print_state(buf
,
543 rdev
->constraints
->state_disk
.enabled
);
545 static DEVICE_ATTR(suspend_disk_state
, 0444,
546 regulator_suspend_disk_state_show
, NULL
);
548 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
549 struct device_attribute
*attr
, char *buf
)
551 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
553 return regulator_print_state(buf
,
554 rdev
->constraints
->state_standby
.enabled
);
556 static DEVICE_ATTR(suspend_standby_state
, 0444,
557 regulator_suspend_standby_state_show
, NULL
);
561 * These are the only attributes are present for all regulators.
562 * Other attributes are a function of regulator functionality.
564 static struct device_attribute regulator_dev_attrs
[] = {
565 __ATTR(name
, 0444, regulator_name_show
, NULL
),
566 __ATTR(num_users
, 0444, regulator_num_users_show
, NULL
),
567 __ATTR(type
, 0444, regulator_type_show
, NULL
),
571 static void regulator_dev_release(struct device
*dev
)
573 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
577 static struct class regulator_class
= {
579 .dev_release
= regulator_dev_release
,
580 .dev_attrs
= regulator_dev_attrs
,
583 /* Calculate the new optimum regulator operating mode based on the new total
584 * consumer load. All locks held by caller */
585 static void drms_uA_update(struct regulator_dev
*rdev
)
587 struct regulator
*sibling
;
588 int current_uA
= 0, output_uV
, input_uV
, err
;
591 err
= regulator_check_drms(rdev
);
592 if (err
< 0 || !rdev
->desc
->ops
->get_optimum_mode
||
593 (!rdev
->desc
->ops
->get_voltage
&&
594 !rdev
->desc
->ops
->get_voltage_sel
) ||
595 !rdev
->desc
->ops
->set_mode
)
598 /* get output voltage */
599 output_uV
= _regulator_get_voltage(rdev
);
603 /* get input voltage */
606 input_uV
= _regulator_get_voltage(rdev
);
608 input_uV
= rdev
->constraints
->input_uV
;
612 /* calc total requested load */
613 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
614 current_uA
+= sibling
->uA_load
;
616 /* now get the optimum mode for our new total regulator load */
617 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
618 output_uV
, current_uA
);
620 /* check the new mode is allowed */
621 err
= regulator_mode_constrain(rdev
, &mode
);
623 rdev
->desc
->ops
->set_mode(rdev
, mode
);
626 static int suspend_set_state(struct regulator_dev
*rdev
,
627 struct regulator_state
*rstate
)
632 can_set_state
= rdev
->desc
->ops
->set_suspend_enable
&&
633 rdev
->desc
->ops
->set_suspend_disable
;
635 /* If we have no suspend mode configration don't set anything;
636 * only warn if the driver actually makes the suspend mode
639 if (!rstate
->enabled
&& !rstate
->disabled
) {
641 rdev_warn(rdev
, "No configuration\n");
645 if (rstate
->enabled
&& rstate
->disabled
) {
646 rdev_err(rdev
, "invalid configuration\n");
650 if (!can_set_state
) {
651 rdev_err(rdev
, "no way to set suspend state\n");
656 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
658 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
660 rdev_err(rdev
, "failed to enabled/disable\n");
664 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
665 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
667 rdev_err(rdev
, "failed to set voltage\n");
672 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
673 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
675 rdev_err(rdev
, "failed to set mode\n");
682 /* locks held by caller */
683 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
685 if (!rdev
->constraints
)
689 case PM_SUSPEND_STANDBY
:
690 return suspend_set_state(rdev
,
691 &rdev
->constraints
->state_standby
);
693 return suspend_set_state(rdev
,
694 &rdev
->constraints
->state_mem
);
696 return suspend_set_state(rdev
,
697 &rdev
->constraints
->state_disk
);
703 static void print_constraints(struct regulator_dev
*rdev
)
705 struct regulation_constraints
*constraints
= rdev
->constraints
;
710 if (constraints
->min_uV
&& constraints
->max_uV
) {
711 if (constraints
->min_uV
== constraints
->max_uV
)
712 count
+= sprintf(buf
+ count
, "%d mV ",
713 constraints
->min_uV
/ 1000);
715 count
+= sprintf(buf
+ count
, "%d <--> %d mV ",
716 constraints
->min_uV
/ 1000,
717 constraints
->max_uV
/ 1000);
720 if (!constraints
->min_uV
||
721 constraints
->min_uV
!= constraints
->max_uV
) {
722 ret
= _regulator_get_voltage(rdev
);
724 count
+= sprintf(buf
+ count
, "at %d mV ", ret
/ 1000);
727 if (constraints
->uV_offset
)
728 count
+= sprintf(buf
, "%dmV offset ",
729 constraints
->uV_offset
/ 1000);
731 if (constraints
->min_uA
&& constraints
->max_uA
) {
732 if (constraints
->min_uA
== constraints
->max_uA
)
733 count
+= sprintf(buf
+ count
, "%d mA ",
734 constraints
->min_uA
/ 1000);
736 count
+= sprintf(buf
+ count
, "%d <--> %d mA ",
737 constraints
->min_uA
/ 1000,
738 constraints
->max_uA
/ 1000);
741 if (!constraints
->min_uA
||
742 constraints
->min_uA
!= constraints
->max_uA
) {
743 ret
= _regulator_get_current_limit(rdev
);
745 count
+= sprintf(buf
+ count
, "at %d mA ", ret
/ 1000);
748 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
749 count
+= sprintf(buf
+ count
, "fast ");
750 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
751 count
+= sprintf(buf
+ count
, "normal ");
752 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
753 count
+= sprintf(buf
+ count
, "idle ");
754 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
755 count
+= sprintf(buf
+ count
, "standby");
757 rdev_info(rdev
, "%s\n", buf
);
760 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
761 struct regulation_constraints
*constraints
)
763 struct regulator_ops
*ops
= rdev
->desc
->ops
;
766 /* do we need to apply the constraint voltage */
767 if (rdev
->constraints
->apply_uV
&&
768 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
) {
769 ret
= _regulator_do_set_voltage(rdev
,
770 rdev
->constraints
->min_uV
,
771 rdev
->constraints
->max_uV
);
773 rdev_err(rdev
, "failed to apply %duV constraint\n",
774 rdev
->constraints
->min_uV
);
775 rdev
->constraints
= NULL
;
780 /* constrain machine-level voltage specs to fit
781 * the actual range supported by this regulator.
783 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
784 int count
= rdev
->desc
->n_voltages
;
786 int min_uV
= INT_MAX
;
787 int max_uV
= INT_MIN
;
788 int cmin
= constraints
->min_uV
;
789 int cmax
= constraints
->max_uV
;
791 /* it's safe to autoconfigure fixed-voltage supplies
792 and the constraints are used by list_voltage. */
793 if (count
== 1 && !cmin
) {
796 constraints
->min_uV
= cmin
;
797 constraints
->max_uV
= cmax
;
800 /* voltage constraints are optional */
801 if ((cmin
== 0) && (cmax
== 0))
804 /* else require explicit machine-level constraints */
805 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
806 rdev_err(rdev
, "invalid voltage constraints\n");
810 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
811 for (i
= 0; i
< count
; i
++) {
814 value
= ops
->list_voltage(rdev
, i
);
818 /* maybe adjust [min_uV..max_uV] */
819 if (value
>= cmin
&& value
< min_uV
)
821 if (value
<= cmax
&& value
> max_uV
)
825 /* final: [min_uV..max_uV] valid iff constraints valid */
826 if (max_uV
< min_uV
) {
827 rdev_err(rdev
, "unsupportable voltage constraints\n");
831 /* use regulator's subset of machine constraints */
832 if (constraints
->min_uV
< min_uV
) {
833 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
834 constraints
->min_uV
, min_uV
);
835 constraints
->min_uV
= min_uV
;
837 if (constraints
->max_uV
> max_uV
) {
838 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
839 constraints
->max_uV
, max_uV
);
840 constraints
->max_uV
= max_uV
;
848 * set_machine_constraints - sets regulator constraints
849 * @rdev: regulator source
850 * @constraints: constraints to apply
852 * Allows platform initialisation code to define and constrain
853 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
854 * Constraints *must* be set by platform code in order for some
855 * regulator operations to proceed i.e. set_voltage, set_current_limit,
858 static int set_machine_constraints(struct regulator_dev
*rdev
,
859 const struct regulation_constraints
*constraints
)
862 struct regulator_ops
*ops
= rdev
->desc
->ops
;
864 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
866 if (!rdev
->constraints
)
869 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
873 /* do we need to setup our suspend state */
874 if (constraints
->initial_state
) {
875 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
877 rdev_err(rdev
, "failed to set suspend state\n");
878 rdev
->constraints
= NULL
;
883 if (constraints
->initial_mode
) {
884 if (!ops
->set_mode
) {
885 rdev_err(rdev
, "no set_mode operation\n");
890 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
892 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
897 /* If the constraints say the regulator should be on at this point
898 * and we have control then make sure it is enabled.
900 if ((rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) &&
902 ret
= ops
->enable(rdev
);
904 rdev_err(rdev
, "failed to enable\n");
905 rdev
->constraints
= NULL
;
910 print_constraints(rdev
);
916 * set_supply - set regulator supply regulator
917 * @rdev: regulator name
918 * @supply_rdev: supply regulator name
920 * Called by platform initialisation code to set the supply regulator for this
921 * regulator. This ensures that a regulators supply will also be enabled by the
922 * core if it's child is enabled.
924 static int set_supply(struct regulator_dev
*rdev
,
925 struct regulator_dev
*supply_rdev
)
929 err
= sysfs_create_link(&rdev
->dev
.kobj
, &supply_rdev
->dev
.kobj
,
932 rdev_err(rdev
, "could not add device link %s err %d\n",
933 supply_rdev
->dev
.kobj
.name
, err
);
936 rdev
->supply
= supply_rdev
;
937 list_add(&rdev
->slist
, &supply_rdev
->supply_list
);
943 * set_consumer_device_supply - Bind a regulator to a symbolic supply
944 * @rdev: regulator source
945 * @consumer_dev: device the supply applies to
946 * @consumer_dev_name: dev_name() string for device supply applies to
947 * @supply: symbolic name for supply
949 * Allows platform initialisation code to map physical regulator
950 * sources to symbolic names for supplies for use by devices. Devices
951 * should use these symbolic names to request regulators, avoiding the
952 * need to provide board-specific regulator names as platform data.
954 * Only one of consumer_dev and consumer_dev_name may be specified.
956 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
957 struct device
*consumer_dev
, const char *consumer_dev_name
,
960 struct regulator_map
*node
;
963 if (consumer_dev
&& consumer_dev_name
)
966 if (!consumer_dev_name
&& consumer_dev
)
967 consumer_dev_name
= dev_name(consumer_dev
);
972 if (consumer_dev_name
!= NULL
)
977 list_for_each_entry(node
, ®ulator_map_list
, list
) {
978 if (node
->dev_name
&& consumer_dev_name
) {
979 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
981 } else if (node
->dev_name
|| consumer_dev_name
) {
985 if (strcmp(node
->supply
, supply
) != 0)
988 dev_dbg(consumer_dev
, "%s/%s is '%s' supply; fail %s/%s\n",
989 dev_name(&node
->regulator
->dev
),
990 node
->regulator
->desc
->name
,
992 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
996 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1000 node
->regulator
= rdev
;
1001 node
->supply
= supply
;
1004 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1005 if (node
->dev_name
== NULL
) {
1011 list_add(&node
->list
, ®ulator_map_list
);
1015 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1017 struct regulator_map
*node
, *n
;
1019 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1020 if (rdev
== node
->regulator
) {
1021 list_del(&node
->list
);
1022 kfree(node
->dev_name
);
1028 #define REG_STR_SIZE 32
1030 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1032 const char *supply_name
)
1034 struct regulator
*regulator
;
1035 char buf
[REG_STR_SIZE
];
1038 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1039 if (regulator
== NULL
)
1042 mutex_lock(&rdev
->mutex
);
1043 regulator
->rdev
= rdev
;
1044 list_add(®ulator
->list
, &rdev
->consumer_list
);
1047 /* create a 'requested_microamps_name' sysfs entry */
1048 size
= scnprintf(buf
, REG_STR_SIZE
, "microamps_requested_%s",
1050 if (size
>= REG_STR_SIZE
)
1053 regulator
->dev
= dev
;
1054 sysfs_attr_init(®ulator
->dev_attr
.attr
);
1055 regulator
->dev_attr
.attr
.name
= kstrdup(buf
, GFP_KERNEL
);
1056 if (regulator
->dev_attr
.attr
.name
== NULL
)
1059 regulator
->dev_attr
.attr
.mode
= 0444;
1060 regulator
->dev_attr
.show
= device_requested_uA_show
;
1061 err
= device_create_file(dev
, ®ulator
->dev_attr
);
1063 rdev_warn(rdev
, "could not add regulator_dev requested microamps sysfs entry\n");
1067 /* also add a link to the device sysfs entry */
1068 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1069 dev
->kobj
.name
, supply_name
);
1070 if (size
>= REG_STR_SIZE
)
1073 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1074 if (regulator
->supply_name
== NULL
)
1077 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1080 rdev_warn(rdev
, "could not add device link %s err %d\n",
1081 dev
->kobj
.name
, err
);
1085 mutex_unlock(&rdev
->mutex
);
1088 kfree(regulator
->supply_name
);
1090 device_remove_file(regulator
->dev
, ®ulator
->dev_attr
);
1092 kfree(regulator
->dev_attr
.attr
.name
);
1094 list_del(®ulator
->list
);
1096 mutex_unlock(&rdev
->mutex
);
1100 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1102 if (!rdev
->desc
->ops
->enable_time
)
1104 return rdev
->desc
->ops
->enable_time(rdev
);
1107 /* Internal regulator request function */
1108 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1111 struct regulator_dev
*rdev
;
1112 struct regulator_map
*map
;
1113 struct regulator
*regulator
= ERR_PTR(-ENODEV
);
1114 const char *devname
= NULL
;
1118 pr_err("get() with no identifier\n");
1123 devname
= dev_name(dev
);
1125 mutex_lock(®ulator_list_mutex
);
1127 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1128 /* If the mapping has a device set up it must match */
1129 if (map
->dev_name
&&
1130 (!devname
|| strcmp(map
->dev_name
, devname
)))
1133 if (strcmp(map
->supply
, id
) == 0) {
1134 rdev
= map
->regulator
;
1139 if (board_wants_dummy_regulator
) {
1140 rdev
= dummy_regulator_rdev
;
1144 #ifdef CONFIG_REGULATOR_DUMMY
1146 devname
= "deviceless";
1148 /* If the board didn't flag that it was fully constrained then
1149 * substitute in a dummy regulator so consumers can continue.
1151 if (!has_full_constraints
) {
1152 pr_warn("%s supply %s not found, using dummy regulator\n",
1154 rdev
= dummy_regulator_rdev
;
1159 mutex_unlock(®ulator_list_mutex
);
1163 if (rdev
->exclusive
) {
1164 regulator
= ERR_PTR(-EPERM
);
1168 if (exclusive
&& rdev
->open_count
) {
1169 regulator
= ERR_PTR(-EBUSY
);
1173 if (!try_module_get(rdev
->owner
))
1176 regulator
= create_regulator(rdev
, dev
, id
);
1177 if (regulator
== NULL
) {
1178 regulator
= ERR_PTR(-ENOMEM
);
1179 module_put(rdev
->owner
);
1184 rdev
->exclusive
= 1;
1186 ret
= _regulator_is_enabled(rdev
);
1188 rdev
->use_count
= 1;
1190 rdev
->use_count
= 0;
1194 mutex_unlock(®ulator_list_mutex
);
1200 * regulator_get - lookup and obtain a reference to a regulator.
1201 * @dev: device for regulator "consumer"
1202 * @id: Supply name or regulator ID.
1204 * Returns a struct regulator corresponding to the regulator producer,
1205 * or IS_ERR() condition containing errno.
1207 * Use of supply names configured via regulator_set_device_supply() is
1208 * strongly encouraged. It is recommended that the supply name used
1209 * should match the name used for the supply and/or the relevant
1210 * device pins in the datasheet.
1212 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1214 return _regulator_get(dev
, id
, 0);
1216 EXPORT_SYMBOL_GPL(regulator_get
);
1219 * regulator_get_exclusive - obtain exclusive access to a regulator.
1220 * @dev: device for regulator "consumer"
1221 * @id: Supply name or regulator ID.
1223 * Returns a struct regulator corresponding to the regulator producer,
1224 * or IS_ERR() condition containing errno. Other consumers will be
1225 * unable to obtain this reference is held and the use count for the
1226 * regulator will be initialised to reflect the current state of the
1229 * This is intended for use by consumers which cannot tolerate shared
1230 * use of the regulator such as those which need to force the
1231 * regulator off for correct operation of the hardware they are
1234 * Use of supply names configured via regulator_set_device_supply() is
1235 * strongly encouraged. It is recommended that the supply name used
1236 * should match the name used for the supply and/or the relevant
1237 * device pins in the datasheet.
1239 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1241 return _regulator_get(dev
, id
, 1);
1243 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1246 * regulator_put - "free" the regulator source
1247 * @regulator: regulator source
1249 * Note: drivers must ensure that all regulator_enable calls made on this
1250 * regulator source are balanced by regulator_disable calls prior to calling
1253 void regulator_put(struct regulator
*regulator
)
1255 struct regulator_dev
*rdev
;
1257 if (regulator
== NULL
|| IS_ERR(regulator
))
1260 mutex_lock(®ulator_list_mutex
);
1261 rdev
= regulator
->rdev
;
1263 /* remove any sysfs entries */
1264 if (regulator
->dev
) {
1265 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1266 kfree(regulator
->supply_name
);
1267 device_remove_file(regulator
->dev
, ®ulator
->dev_attr
);
1268 kfree(regulator
->dev_attr
.attr
.name
);
1270 list_del(®ulator
->list
);
1274 rdev
->exclusive
= 0;
1276 module_put(rdev
->owner
);
1277 mutex_unlock(®ulator_list_mutex
);
1279 EXPORT_SYMBOL_GPL(regulator_put
);
1281 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
1283 if (!rdev
->constraints
)
1286 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
1292 /* locks held by regulator_enable() */
1293 static int _regulator_enable(struct regulator_dev
*rdev
)
1297 if (rdev
->use_count
== 0) {
1298 /* do we need to enable the supply regulator first */
1300 mutex_lock(&rdev
->supply
->mutex
);
1301 ret
= _regulator_enable(rdev
->supply
);
1302 mutex_unlock(&rdev
->supply
->mutex
);
1304 rdev_err(rdev
, "failed to enable: %d\n", ret
);
1310 /* check voltage and requested load before enabling */
1311 if (rdev
->constraints
&&
1312 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1313 drms_uA_update(rdev
);
1315 if (rdev
->use_count
== 0) {
1316 /* The regulator may on if it's not switchable or left on */
1317 ret
= _regulator_is_enabled(rdev
);
1318 if (ret
== -EINVAL
|| ret
== 0) {
1319 if (!_regulator_can_change_status(rdev
))
1322 if (!rdev
->desc
->ops
->enable
)
1325 /* Query before enabling in case configuration
1327 ret
= _regulator_get_enable_time(rdev
);
1331 rdev_warn(rdev
, "enable_time() failed: %d\n",
1336 trace_regulator_enable(rdev_get_name(rdev
));
1338 /* Allow the regulator to ramp; it would be useful
1339 * to extend this for bulk operations so that the
1340 * regulators can ramp together. */
1341 ret
= rdev
->desc
->ops
->enable(rdev
);
1345 trace_regulator_enable_delay(rdev_get_name(rdev
));
1347 if (delay
>= 1000) {
1348 mdelay(delay
/ 1000);
1349 udelay(delay
% 1000);
1354 trace_regulator_enable_complete(rdev_get_name(rdev
));
1356 } else if (ret
< 0) {
1357 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
1360 /* Fallthrough on positive return values - already enabled */
1369 * regulator_enable - enable regulator output
1370 * @regulator: regulator source
1372 * Request that the regulator be enabled with the regulator output at
1373 * the predefined voltage or current value. Calls to regulator_enable()
1374 * must be balanced with calls to regulator_disable().
1376 * NOTE: the output value can be set by other drivers, boot loader or may be
1377 * hardwired in the regulator.
1379 int regulator_enable(struct regulator
*regulator
)
1381 struct regulator_dev
*rdev
= regulator
->rdev
;
1384 mutex_lock(&rdev
->mutex
);
1385 ret
= _regulator_enable(rdev
);
1386 mutex_unlock(&rdev
->mutex
);
1389 EXPORT_SYMBOL_GPL(regulator_enable
);
1391 /* locks held by regulator_disable() */
1392 static int _regulator_disable(struct regulator_dev
*rdev
,
1393 struct regulator_dev
**supply_rdev_ptr
)
1396 *supply_rdev_ptr
= NULL
;
1398 if (WARN(rdev
->use_count
<= 0,
1399 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
1402 /* are we the last user and permitted to disable ? */
1403 if (rdev
->use_count
== 1 &&
1404 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1406 /* we are last user */
1407 if (_regulator_can_change_status(rdev
) &&
1408 rdev
->desc
->ops
->disable
) {
1409 trace_regulator_disable(rdev_get_name(rdev
));
1411 ret
= rdev
->desc
->ops
->disable(rdev
);
1413 rdev_err(rdev
, "failed to disable\n");
1417 trace_regulator_disable_complete(rdev_get_name(rdev
));
1419 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1423 /* decrease our supplies ref count and disable if required */
1424 *supply_rdev_ptr
= rdev
->supply
;
1426 rdev
->use_count
= 0;
1427 } else if (rdev
->use_count
> 1) {
1429 if (rdev
->constraints
&&
1430 (rdev
->constraints
->valid_ops_mask
&
1431 REGULATOR_CHANGE_DRMS
))
1432 drms_uA_update(rdev
);
1440 * regulator_disable - disable regulator output
1441 * @regulator: regulator source
1443 * Disable the regulator output voltage or current. Calls to
1444 * regulator_enable() must be balanced with calls to
1445 * regulator_disable().
1447 * NOTE: this will only disable the regulator output if no other consumer
1448 * devices have it enabled, the regulator device supports disabling and
1449 * machine constraints permit this operation.
1451 int regulator_disable(struct regulator
*regulator
)
1453 struct regulator_dev
*rdev
= regulator
->rdev
;
1454 struct regulator_dev
*supply_rdev
= NULL
;
1457 mutex_lock(&rdev
->mutex
);
1458 ret
= _regulator_disable(rdev
, &supply_rdev
);
1459 mutex_unlock(&rdev
->mutex
);
1461 /* decrease our supplies ref count and disable if required */
1462 while (supply_rdev
!= NULL
) {
1465 mutex_lock(&rdev
->mutex
);
1466 _regulator_disable(rdev
, &supply_rdev
);
1467 mutex_unlock(&rdev
->mutex
);
1472 EXPORT_SYMBOL_GPL(regulator_disable
);
1474 /* locks held by regulator_force_disable() */
1475 static int _regulator_force_disable(struct regulator_dev
*rdev
,
1476 struct regulator_dev
**supply_rdev_ptr
)
1481 if (rdev
->desc
->ops
->disable
) {
1482 /* ah well, who wants to live forever... */
1483 ret
= rdev
->desc
->ops
->disable(rdev
);
1485 rdev_err(rdev
, "failed to force disable\n");
1488 /* notify other consumers that power has been forced off */
1489 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1490 REGULATOR_EVENT_DISABLE
, NULL
);
1493 /* decrease our supplies ref count and disable if required */
1494 *supply_rdev_ptr
= rdev
->supply
;
1496 rdev
->use_count
= 0;
1501 * regulator_force_disable - force disable regulator output
1502 * @regulator: regulator source
1504 * Forcibly disable the regulator output voltage or current.
1505 * NOTE: this *will* disable the regulator output even if other consumer
1506 * devices have it enabled. This should be used for situations when device
1507 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1509 int regulator_force_disable(struct regulator
*regulator
)
1511 struct regulator_dev
*rdev
= regulator
->rdev
;
1512 struct regulator_dev
*supply_rdev
= NULL
;
1515 mutex_lock(&rdev
->mutex
);
1516 regulator
->uA_load
= 0;
1517 ret
= _regulator_force_disable(rdev
, &supply_rdev
);
1518 mutex_unlock(&rdev
->mutex
);
1521 regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev
)));
1525 EXPORT_SYMBOL_GPL(regulator_force_disable
);
1527 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
1529 /* If we don't know then assume that the regulator is always on */
1530 if (!rdev
->desc
->ops
->is_enabled
)
1533 return rdev
->desc
->ops
->is_enabled(rdev
);
1537 * regulator_is_enabled - is the regulator output enabled
1538 * @regulator: regulator source
1540 * Returns positive if the regulator driver backing the source/client
1541 * has requested that the device be enabled, zero if it hasn't, else a
1542 * negative errno code.
1544 * Note that the device backing this regulator handle can have multiple
1545 * users, so it might be enabled even if regulator_enable() was never
1546 * called for this particular source.
1548 int regulator_is_enabled(struct regulator
*regulator
)
1552 mutex_lock(®ulator
->rdev
->mutex
);
1553 ret
= _regulator_is_enabled(regulator
->rdev
);
1554 mutex_unlock(®ulator
->rdev
->mutex
);
1558 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
1561 * regulator_count_voltages - count regulator_list_voltage() selectors
1562 * @regulator: regulator source
1564 * Returns number of selectors, or negative errno. Selectors are
1565 * numbered starting at zero, and typically correspond to bitfields
1566 * in hardware registers.
1568 int regulator_count_voltages(struct regulator
*regulator
)
1570 struct regulator_dev
*rdev
= regulator
->rdev
;
1572 return rdev
->desc
->n_voltages
? : -EINVAL
;
1574 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
1577 * regulator_list_voltage - enumerate supported voltages
1578 * @regulator: regulator source
1579 * @selector: identify voltage to list
1580 * Context: can sleep
1582 * Returns a voltage that can be passed to @regulator_set_voltage(),
1583 * zero if this selector code can't be used on this system, or a
1586 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
1588 struct regulator_dev
*rdev
= regulator
->rdev
;
1589 struct regulator_ops
*ops
= rdev
->desc
->ops
;
1592 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
1595 mutex_lock(&rdev
->mutex
);
1596 ret
= ops
->list_voltage(rdev
, selector
);
1597 mutex_unlock(&rdev
->mutex
);
1600 if (ret
< rdev
->constraints
->min_uV
)
1602 else if (ret
> rdev
->constraints
->max_uV
)
1608 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
1611 * regulator_is_supported_voltage - check if a voltage range can be supported
1613 * @regulator: Regulator to check.
1614 * @min_uV: Minimum required voltage in uV.
1615 * @max_uV: Maximum required voltage in uV.
1617 * Returns a boolean or a negative error code.
1619 int regulator_is_supported_voltage(struct regulator
*regulator
,
1620 int min_uV
, int max_uV
)
1622 int i
, voltages
, ret
;
1624 ret
= regulator_count_voltages(regulator
);
1629 for (i
= 0; i
< voltages
; i
++) {
1630 ret
= regulator_list_voltage(regulator
, i
);
1632 if (ret
>= min_uV
&& ret
<= max_uV
)
1639 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
1640 int min_uV
, int max_uV
)
1644 unsigned int selector
;
1646 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
1648 min_uV
+= rdev
->constraints
->uV_offset
;
1649 max_uV
+= rdev
->constraints
->uV_offset
;
1651 if (rdev
->desc
->ops
->set_voltage
) {
1652 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
,
1655 if (rdev
->desc
->ops
->list_voltage
)
1656 selector
= rdev
->desc
->ops
->list_voltage(rdev
,
1660 } else if (rdev
->desc
->ops
->set_voltage_sel
) {
1661 int best_val
= INT_MAX
;
1666 /* Find the smallest voltage that falls within the specified
1669 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
1670 ret
= rdev
->desc
->ops
->list_voltage(rdev
, i
);
1674 if (ret
< best_val
&& ret
>= min_uV
&& ret
<= max_uV
) {
1681 * If we can't obtain the old selector there is not enough
1682 * info to call set_voltage_time_sel().
1684 if (rdev
->desc
->ops
->set_voltage_time_sel
&&
1685 rdev
->desc
->ops
->get_voltage_sel
) {
1686 unsigned int old_selector
= 0;
1688 ret
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
1692 delay
= rdev
->desc
->ops
->set_voltage_time_sel(rdev
,
1693 old_selector
, selector
);
1696 if (best_val
!= INT_MAX
) {
1697 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
1698 selector
= best_val
;
1706 /* Insert any necessary delays */
1707 if (delay
>= 1000) {
1708 mdelay(delay
/ 1000);
1709 udelay(delay
% 1000);
1715 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
1718 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), selector
);
1724 * regulator_set_voltage - set regulator output voltage
1725 * @regulator: regulator source
1726 * @min_uV: Minimum required voltage in uV
1727 * @max_uV: Maximum acceptable voltage in uV
1729 * Sets a voltage regulator to the desired output voltage. This can be set
1730 * during any regulator state. IOW, regulator can be disabled or enabled.
1732 * If the regulator is enabled then the voltage will change to the new value
1733 * immediately otherwise if the regulator is disabled the regulator will
1734 * output at the new voltage when enabled.
1736 * NOTE: If the regulator is shared between several devices then the lowest
1737 * request voltage that meets the system constraints will be used.
1738 * Regulator system constraints must be set for this regulator before
1739 * calling this function otherwise this call will fail.
1741 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
1743 struct regulator_dev
*rdev
= regulator
->rdev
;
1746 mutex_lock(&rdev
->mutex
);
1748 /* If we're setting the same range as last time the change
1749 * should be a noop (some cpufreq implementations use the same
1750 * voltage for multiple frequencies, for example).
1752 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
1756 if (!rdev
->desc
->ops
->set_voltage
&&
1757 !rdev
->desc
->ops
->set_voltage_sel
) {
1762 /* constraints check */
1763 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
1766 regulator
->min_uV
= min_uV
;
1767 regulator
->max_uV
= max_uV
;
1769 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
1773 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
1776 mutex_unlock(&rdev
->mutex
);
1779 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
1782 * regulator_set_voltage_time - get raise/fall time
1783 * @regulator: regulator source
1784 * @old_uV: starting voltage in microvolts
1785 * @new_uV: target voltage in microvolts
1787 * Provided with the starting and ending voltage, this function attempts to
1788 * calculate the time in microseconds required to rise or fall to this new
1791 int regulator_set_voltage_time(struct regulator
*regulator
,
1792 int old_uV
, int new_uV
)
1794 struct regulator_dev
*rdev
= regulator
->rdev
;
1795 struct regulator_ops
*ops
= rdev
->desc
->ops
;
1801 /* Currently requires operations to do this */
1802 if (!ops
->list_voltage
|| !ops
->set_voltage_time_sel
1803 || !rdev
->desc
->n_voltages
)
1806 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
1807 /* We only look for exact voltage matches here */
1808 voltage
= regulator_list_voltage(regulator
, i
);
1813 if (voltage
== old_uV
)
1815 if (voltage
== new_uV
)
1819 if (old_sel
< 0 || new_sel
< 0)
1822 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
1824 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
1827 * regulator_sync_voltage - re-apply last regulator output voltage
1828 * @regulator: regulator source
1830 * Re-apply the last configured voltage. This is intended to be used
1831 * where some external control source the consumer is cooperating with
1832 * has caused the configured voltage to change.
1834 int regulator_sync_voltage(struct regulator
*regulator
)
1836 struct regulator_dev
*rdev
= regulator
->rdev
;
1837 int ret
, min_uV
, max_uV
;
1839 mutex_lock(&rdev
->mutex
);
1841 if (!rdev
->desc
->ops
->set_voltage
&&
1842 !rdev
->desc
->ops
->set_voltage_sel
) {
1847 /* This is only going to work if we've had a voltage configured. */
1848 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
1853 min_uV
= regulator
->min_uV
;
1854 max_uV
= regulator
->max_uV
;
1856 /* This should be a paranoia check... */
1857 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
1861 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
1865 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
1868 mutex_unlock(&rdev
->mutex
);
1871 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
1873 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
1877 if (rdev
->desc
->ops
->get_voltage_sel
) {
1878 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
1881 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
1883 if (rdev
->desc
->ops
->get_voltage
)
1884 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
1888 return ret
- rdev
->constraints
->uV_offset
;
1892 * regulator_get_voltage - get regulator output voltage
1893 * @regulator: regulator source
1895 * This returns the current regulator voltage in uV.
1897 * NOTE: If the regulator is disabled it will return the voltage value. This
1898 * function should not be used to determine regulator state.
1900 int regulator_get_voltage(struct regulator
*regulator
)
1904 mutex_lock(®ulator
->rdev
->mutex
);
1906 ret
= _regulator_get_voltage(regulator
->rdev
);
1908 mutex_unlock(®ulator
->rdev
->mutex
);
1912 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
1915 * regulator_set_current_limit - set regulator output current limit
1916 * @regulator: regulator source
1917 * @min_uA: Minimuum supported current in uA
1918 * @max_uA: Maximum supported current in uA
1920 * Sets current sink to the desired output current. This can be set during
1921 * any regulator state. IOW, regulator can be disabled or enabled.
1923 * If the regulator is enabled then the current will change to the new value
1924 * immediately otherwise if the regulator is disabled the regulator will
1925 * output at the new current when enabled.
1927 * NOTE: Regulator system constraints must be set for this regulator before
1928 * calling this function otherwise this call will fail.
1930 int regulator_set_current_limit(struct regulator
*regulator
,
1931 int min_uA
, int max_uA
)
1933 struct regulator_dev
*rdev
= regulator
->rdev
;
1936 mutex_lock(&rdev
->mutex
);
1939 if (!rdev
->desc
->ops
->set_current_limit
) {
1944 /* constraints check */
1945 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
1949 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
1951 mutex_unlock(&rdev
->mutex
);
1954 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
1956 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
1960 mutex_lock(&rdev
->mutex
);
1963 if (!rdev
->desc
->ops
->get_current_limit
) {
1968 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
1970 mutex_unlock(&rdev
->mutex
);
1975 * regulator_get_current_limit - get regulator output current
1976 * @regulator: regulator source
1978 * This returns the current supplied by the specified current sink in uA.
1980 * NOTE: If the regulator is disabled it will return the current value. This
1981 * function should not be used to determine regulator state.
1983 int regulator_get_current_limit(struct regulator
*regulator
)
1985 return _regulator_get_current_limit(regulator
->rdev
);
1987 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
1990 * regulator_set_mode - set regulator operating mode
1991 * @regulator: regulator source
1992 * @mode: operating mode - one of the REGULATOR_MODE constants
1994 * Set regulator operating mode to increase regulator efficiency or improve
1995 * regulation performance.
1997 * NOTE: Regulator system constraints must be set for this regulator before
1998 * calling this function otherwise this call will fail.
2000 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
2002 struct regulator_dev
*rdev
= regulator
->rdev
;
2004 int regulator_curr_mode
;
2006 mutex_lock(&rdev
->mutex
);
2009 if (!rdev
->desc
->ops
->set_mode
) {
2014 /* return if the same mode is requested */
2015 if (rdev
->desc
->ops
->get_mode
) {
2016 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
2017 if (regulator_curr_mode
== mode
) {
2023 /* constraints check */
2024 ret
= regulator_mode_constrain(rdev
, &mode
);
2028 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2030 mutex_unlock(&rdev
->mutex
);
2033 EXPORT_SYMBOL_GPL(regulator_set_mode
);
2035 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
2039 mutex_lock(&rdev
->mutex
);
2042 if (!rdev
->desc
->ops
->get_mode
) {
2047 ret
= rdev
->desc
->ops
->get_mode(rdev
);
2049 mutex_unlock(&rdev
->mutex
);
2054 * regulator_get_mode - get regulator operating mode
2055 * @regulator: regulator source
2057 * Get the current regulator operating mode.
2059 unsigned int regulator_get_mode(struct regulator
*regulator
)
2061 return _regulator_get_mode(regulator
->rdev
);
2063 EXPORT_SYMBOL_GPL(regulator_get_mode
);
2066 * regulator_set_optimum_mode - set regulator optimum operating mode
2067 * @regulator: regulator source
2068 * @uA_load: load current
2070 * Notifies the regulator core of a new device load. This is then used by
2071 * DRMS (if enabled by constraints) to set the most efficient regulator
2072 * operating mode for the new regulator loading.
2074 * Consumer devices notify their supply regulator of the maximum power
2075 * they will require (can be taken from device datasheet in the power
2076 * consumption tables) when they change operational status and hence power
2077 * state. Examples of operational state changes that can affect power
2078 * consumption are :-
2080 * o Device is opened / closed.
2081 * o Device I/O is about to begin or has just finished.
2082 * o Device is idling in between work.
2084 * This information is also exported via sysfs to userspace.
2086 * DRMS will sum the total requested load on the regulator and change
2087 * to the most efficient operating mode if platform constraints allow.
2089 * Returns the new regulator mode or error.
2091 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
2093 struct regulator_dev
*rdev
= regulator
->rdev
;
2094 struct regulator
*consumer
;
2095 int ret
, output_uV
, input_uV
, total_uA_load
= 0;
2098 mutex_lock(&rdev
->mutex
);
2100 regulator
->uA_load
= uA_load
;
2101 ret
= regulator_check_drms(rdev
);
2107 if (!rdev
->desc
->ops
->get_optimum_mode
)
2110 /* get output voltage */
2111 output_uV
= _regulator_get_voltage(rdev
);
2112 if (output_uV
<= 0) {
2113 rdev_err(rdev
, "invalid output voltage found\n");
2117 /* get input voltage */
2120 input_uV
= _regulator_get_voltage(rdev
->supply
);
2122 input_uV
= rdev
->constraints
->input_uV
;
2123 if (input_uV
<= 0) {
2124 rdev_err(rdev
, "invalid input voltage found\n");
2128 /* calc total requested load for this regulator */
2129 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
2130 total_uA_load
+= consumer
->uA_load
;
2132 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
2133 input_uV
, output_uV
,
2135 ret
= regulator_mode_constrain(rdev
, &mode
);
2137 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2138 total_uA_load
, input_uV
, output_uV
);
2142 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
2144 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
2149 mutex_unlock(&rdev
->mutex
);
2152 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
2155 * regulator_register_notifier - register regulator event notifier
2156 * @regulator: regulator source
2157 * @nb: notifier block
2159 * Register notifier block to receive regulator events.
2161 int regulator_register_notifier(struct regulator
*regulator
,
2162 struct notifier_block
*nb
)
2164 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
2167 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
2170 * regulator_unregister_notifier - unregister regulator event notifier
2171 * @regulator: regulator source
2172 * @nb: notifier block
2174 * Unregister regulator event notifier block.
2176 int regulator_unregister_notifier(struct regulator
*regulator
,
2177 struct notifier_block
*nb
)
2179 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
2182 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
2184 /* notify regulator consumers and downstream regulator consumers.
2185 * Note mutex must be held by caller.
2187 static void _notifier_call_chain(struct regulator_dev
*rdev
,
2188 unsigned long event
, void *data
)
2190 struct regulator_dev
*_rdev
;
2192 /* call rdev chain first */
2193 blocking_notifier_call_chain(&rdev
->notifier
, event
, NULL
);
2195 /* now notify regulator we supply */
2196 list_for_each_entry(_rdev
, &rdev
->supply_list
, slist
) {
2197 mutex_lock(&_rdev
->mutex
);
2198 _notifier_call_chain(_rdev
, event
, data
);
2199 mutex_unlock(&_rdev
->mutex
);
2204 * regulator_bulk_get - get multiple regulator consumers
2206 * @dev: Device to supply
2207 * @num_consumers: Number of consumers to register
2208 * @consumers: Configuration of consumers; clients are stored here.
2210 * @return 0 on success, an errno on failure.
2212 * This helper function allows drivers to get several regulator
2213 * consumers in one operation. If any of the regulators cannot be
2214 * acquired then any regulators that were allocated will be freed
2215 * before returning to the caller.
2217 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
2218 struct regulator_bulk_data
*consumers
)
2223 for (i
= 0; i
< num_consumers
; i
++)
2224 consumers
[i
].consumer
= NULL
;
2226 for (i
= 0; i
< num_consumers
; i
++) {
2227 consumers
[i
].consumer
= regulator_get(dev
,
2228 consumers
[i
].supply
);
2229 if (IS_ERR(consumers
[i
].consumer
)) {
2230 ret
= PTR_ERR(consumers
[i
].consumer
);
2231 dev_err(dev
, "Failed to get supply '%s': %d\n",
2232 consumers
[i
].supply
, ret
);
2233 consumers
[i
].consumer
= NULL
;
2241 for (i
= 0; i
< num_consumers
&& consumers
[i
].consumer
; i
++)
2242 regulator_put(consumers
[i
].consumer
);
2246 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
2249 * regulator_bulk_enable - enable multiple regulator consumers
2251 * @num_consumers: Number of consumers
2252 * @consumers: Consumer data; clients are stored here.
2253 * @return 0 on success, an errno on failure
2255 * This convenience API allows consumers to enable multiple regulator
2256 * clients in a single API call. If any consumers cannot be enabled
2257 * then any others that were enabled will be disabled again prior to
2260 int regulator_bulk_enable(int num_consumers
,
2261 struct regulator_bulk_data
*consumers
)
2266 for (i
= 0; i
< num_consumers
; i
++) {
2267 ret
= regulator_enable(consumers
[i
].consumer
);
2275 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
, ret
);
2276 for (--i
; i
>= 0; --i
)
2277 regulator_disable(consumers
[i
].consumer
);
2281 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
2284 * regulator_bulk_disable - disable multiple regulator consumers
2286 * @num_consumers: Number of consumers
2287 * @consumers: Consumer data; clients are stored here.
2288 * @return 0 on success, an errno on failure
2290 * This convenience API allows consumers to disable multiple regulator
2291 * clients in a single API call. If any consumers cannot be enabled
2292 * then any others that were disabled will be disabled again prior to
2295 int regulator_bulk_disable(int num_consumers
,
2296 struct regulator_bulk_data
*consumers
)
2301 for (i
= 0; i
< num_consumers
; i
++) {
2302 ret
= regulator_disable(consumers
[i
].consumer
);
2310 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
2311 for (--i
; i
>= 0; --i
)
2312 regulator_enable(consumers
[i
].consumer
);
2316 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
2319 * regulator_bulk_free - free multiple regulator consumers
2321 * @num_consumers: Number of consumers
2322 * @consumers: Consumer data; clients are stored here.
2324 * This convenience API allows consumers to free multiple regulator
2325 * clients in a single API call.
2327 void regulator_bulk_free(int num_consumers
,
2328 struct regulator_bulk_data
*consumers
)
2332 for (i
= 0; i
< num_consumers
; i
++) {
2333 regulator_put(consumers
[i
].consumer
);
2334 consumers
[i
].consumer
= NULL
;
2337 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
2340 * regulator_notifier_call_chain - call regulator event notifier
2341 * @rdev: regulator source
2342 * @event: notifier block
2343 * @data: callback-specific data.
2345 * Called by regulator drivers to notify clients a regulator event has
2346 * occurred. We also notify regulator clients downstream.
2347 * Note lock must be held by caller.
2349 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
2350 unsigned long event
, void *data
)
2352 _notifier_call_chain(rdev
, event
, data
);
2356 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
2359 * regulator_mode_to_status - convert a regulator mode into a status
2361 * @mode: Mode to convert
2363 * Convert a regulator mode into a status.
2365 int regulator_mode_to_status(unsigned int mode
)
2368 case REGULATOR_MODE_FAST
:
2369 return REGULATOR_STATUS_FAST
;
2370 case REGULATOR_MODE_NORMAL
:
2371 return REGULATOR_STATUS_NORMAL
;
2372 case REGULATOR_MODE_IDLE
:
2373 return REGULATOR_STATUS_IDLE
;
2374 case REGULATOR_STATUS_STANDBY
:
2375 return REGULATOR_STATUS_STANDBY
;
2380 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
2383 * To avoid cluttering sysfs (and memory) with useless state, only
2384 * create attributes that can be meaningfully displayed.
2386 static int add_regulator_attributes(struct regulator_dev
*rdev
)
2388 struct device
*dev
= &rdev
->dev
;
2389 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2392 /* some attributes need specific methods to be displayed */
2393 if (ops
->get_voltage
|| ops
->get_voltage_sel
) {
2394 status
= device_create_file(dev
, &dev_attr_microvolts
);
2398 if (ops
->get_current_limit
) {
2399 status
= device_create_file(dev
, &dev_attr_microamps
);
2403 if (ops
->get_mode
) {
2404 status
= device_create_file(dev
, &dev_attr_opmode
);
2408 if (ops
->is_enabled
) {
2409 status
= device_create_file(dev
, &dev_attr_state
);
2413 if (ops
->get_status
) {
2414 status
= device_create_file(dev
, &dev_attr_status
);
2419 /* some attributes are type-specific */
2420 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
2421 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
2426 /* all the other attributes exist to support constraints;
2427 * don't show them if there are no constraints, or if the
2428 * relevant supporting methods are missing.
2430 if (!rdev
->constraints
)
2433 /* constraints need specific supporting methods */
2434 if (ops
->set_voltage
|| ops
->set_voltage_sel
) {
2435 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
2438 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
2442 if (ops
->set_current_limit
) {
2443 status
= device_create_file(dev
, &dev_attr_min_microamps
);
2446 status
= device_create_file(dev
, &dev_attr_max_microamps
);
2451 /* suspend mode constraints need multiple supporting methods */
2452 if (!(ops
->set_suspend_enable
&& ops
->set_suspend_disable
))
2455 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
2458 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
2461 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
2465 if (ops
->set_suspend_voltage
) {
2466 status
= device_create_file(dev
,
2467 &dev_attr_suspend_standby_microvolts
);
2470 status
= device_create_file(dev
,
2471 &dev_attr_suspend_mem_microvolts
);
2474 status
= device_create_file(dev
,
2475 &dev_attr_suspend_disk_microvolts
);
2480 if (ops
->set_suspend_mode
) {
2481 status
= device_create_file(dev
,
2482 &dev_attr_suspend_standby_mode
);
2485 status
= device_create_file(dev
,
2486 &dev_attr_suspend_mem_mode
);
2489 status
= device_create_file(dev
,
2490 &dev_attr_suspend_disk_mode
);
2498 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
2500 #ifdef CONFIG_DEBUG_FS
2501 rdev
->debugfs
= debugfs_create_dir(rdev_get_name(rdev
), debugfs_root
);
2502 if (IS_ERR(rdev
->debugfs
) || !rdev
->debugfs
) {
2503 rdev_warn(rdev
, "Failed to create debugfs directory\n");
2504 rdev
->debugfs
= NULL
;
2508 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
2510 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
2516 * regulator_register - register regulator
2517 * @regulator_desc: regulator to register
2518 * @dev: struct device for the regulator
2519 * @init_data: platform provided init data, passed through by driver
2520 * @driver_data: private regulator data
2522 * Called by regulator drivers to register a regulator.
2523 * Returns 0 on success.
2525 struct regulator_dev
*regulator_register(struct regulator_desc
*regulator_desc
,
2526 struct device
*dev
, const struct regulator_init_data
*init_data
,
2529 static atomic_t regulator_no
= ATOMIC_INIT(0);
2530 struct regulator_dev
*rdev
;
2533 if (regulator_desc
== NULL
)
2534 return ERR_PTR(-EINVAL
);
2536 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
2537 return ERR_PTR(-EINVAL
);
2539 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
2540 regulator_desc
->type
!= REGULATOR_CURRENT
)
2541 return ERR_PTR(-EINVAL
);
2544 return ERR_PTR(-EINVAL
);
2546 /* Only one of each should be implemented */
2547 WARN_ON(regulator_desc
->ops
->get_voltage
&&
2548 regulator_desc
->ops
->get_voltage_sel
);
2549 WARN_ON(regulator_desc
->ops
->set_voltage
&&
2550 regulator_desc
->ops
->set_voltage_sel
);
2552 /* If we're using selectors we must implement list_voltage. */
2553 if (regulator_desc
->ops
->get_voltage_sel
&&
2554 !regulator_desc
->ops
->list_voltage
) {
2555 return ERR_PTR(-EINVAL
);
2557 if (regulator_desc
->ops
->set_voltage_sel
&&
2558 !regulator_desc
->ops
->list_voltage
) {
2559 return ERR_PTR(-EINVAL
);
2562 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
2564 return ERR_PTR(-ENOMEM
);
2566 mutex_lock(®ulator_list_mutex
);
2568 mutex_init(&rdev
->mutex
);
2569 rdev
->reg_data
= driver_data
;
2570 rdev
->owner
= regulator_desc
->owner
;
2571 rdev
->desc
= regulator_desc
;
2572 INIT_LIST_HEAD(&rdev
->consumer_list
);
2573 INIT_LIST_HEAD(&rdev
->supply_list
);
2574 INIT_LIST_HEAD(&rdev
->list
);
2575 INIT_LIST_HEAD(&rdev
->slist
);
2576 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
2578 /* preform any regulator specific init */
2579 if (init_data
->regulator_init
) {
2580 ret
= init_data
->regulator_init(rdev
->reg_data
);
2585 /* register with sysfs */
2586 rdev
->dev
.class = ®ulator_class
;
2587 rdev
->dev
.parent
= dev
;
2588 dev_set_name(&rdev
->dev
, "regulator.%d",
2589 atomic_inc_return(®ulator_no
) - 1);
2590 ret
= device_register(&rdev
->dev
);
2592 put_device(&rdev
->dev
);
2596 dev_set_drvdata(&rdev
->dev
, rdev
);
2598 /* set regulator constraints */
2599 ret
= set_machine_constraints(rdev
, &init_data
->constraints
);
2603 /* add attributes supported by this regulator */
2604 ret
= add_regulator_attributes(rdev
);
2608 if (init_data
->supply_regulator
) {
2609 struct regulator_dev
*r
;
2612 list_for_each_entry(r
, ®ulator_list
, list
) {
2613 if (strcmp(rdev_get_name(r
),
2614 init_data
->supply_regulator
) == 0) {
2621 dev_err(dev
, "Failed to find supply %s\n",
2622 init_data
->supply_regulator
);
2627 ret
= set_supply(rdev
, r
);
2632 /* add consumers devices */
2633 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
2634 ret
= set_consumer_device_supply(rdev
,
2635 init_data
->consumer_supplies
[i
].dev
,
2636 init_data
->consumer_supplies
[i
].dev_name
,
2637 init_data
->consumer_supplies
[i
].supply
);
2639 dev_err(dev
, "Failed to set supply %s\n",
2640 init_data
->consumer_supplies
[i
].supply
);
2641 goto unset_supplies
;
2645 list_add(&rdev
->list
, ®ulator_list
);
2647 rdev_init_debugfs(rdev
);
2649 mutex_unlock(®ulator_list_mutex
);
2653 unset_regulator_supplies(rdev
);
2656 device_unregister(&rdev
->dev
);
2657 /* device core frees rdev */
2658 rdev
= ERR_PTR(ret
);
2663 rdev
= ERR_PTR(ret
);
2666 EXPORT_SYMBOL_GPL(regulator_register
);
2669 * regulator_unregister - unregister regulator
2670 * @rdev: regulator to unregister
2672 * Called by regulator drivers to unregister a regulator.
2674 void regulator_unregister(struct regulator_dev
*rdev
)
2679 mutex_lock(®ulator_list_mutex
);
2680 #ifdef CONFIG_DEBUG_FS
2681 debugfs_remove_recursive(rdev
->debugfs
);
2683 WARN_ON(rdev
->open_count
);
2684 unset_regulator_supplies(rdev
);
2685 list_del(&rdev
->list
);
2687 sysfs_remove_link(&rdev
->dev
.kobj
, "supply");
2688 device_unregister(&rdev
->dev
);
2689 kfree(rdev
->constraints
);
2690 mutex_unlock(®ulator_list_mutex
);
2692 EXPORT_SYMBOL_GPL(regulator_unregister
);
2695 * regulator_suspend_prepare - prepare regulators for system wide suspend
2696 * @state: system suspend state
2698 * Configure each regulator with it's suspend operating parameters for state.
2699 * This will usually be called by machine suspend code prior to supending.
2701 int regulator_suspend_prepare(suspend_state_t state
)
2703 struct regulator_dev
*rdev
;
2706 /* ON is handled by regulator active state */
2707 if (state
== PM_SUSPEND_ON
)
2710 mutex_lock(®ulator_list_mutex
);
2711 list_for_each_entry(rdev
, ®ulator_list
, list
) {
2713 mutex_lock(&rdev
->mutex
);
2714 ret
= suspend_prepare(rdev
, state
);
2715 mutex_unlock(&rdev
->mutex
);
2718 rdev_err(rdev
, "failed to prepare\n");
2723 mutex_unlock(®ulator_list_mutex
);
2726 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
2729 * regulator_suspend_finish - resume regulators from system wide suspend
2731 * Turn on regulators that might be turned off by regulator_suspend_prepare
2732 * and that should be turned on according to the regulators properties.
2734 int regulator_suspend_finish(void)
2736 struct regulator_dev
*rdev
;
2739 mutex_lock(®ulator_list_mutex
);
2740 list_for_each_entry(rdev
, ®ulator_list
, list
) {
2741 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2743 mutex_lock(&rdev
->mutex
);
2744 if ((rdev
->use_count
> 0 || rdev
->constraints
->always_on
) &&
2746 error
= ops
->enable(rdev
);
2750 if (!has_full_constraints
)
2754 if (ops
->is_enabled
&& !ops
->is_enabled(rdev
))
2757 error
= ops
->disable(rdev
);
2762 mutex_unlock(&rdev
->mutex
);
2764 mutex_unlock(®ulator_list_mutex
);
2767 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
2770 * regulator_has_full_constraints - the system has fully specified constraints
2772 * Calling this function will cause the regulator API to disable all
2773 * regulators which have a zero use count and don't have an always_on
2774 * constraint in a late_initcall.
2776 * The intention is that this will become the default behaviour in a
2777 * future kernel release so users are encouraged to use this facility
2780 void regulator_has_full_constraints(void)
2782 has_full_constraints
= 1;
2784 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
2787 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
2789 * Calling this function will cause the regulator API to provide a
2790 * dummy regulator to consumers if no physical regulator is found,
2791 * allowing most consumers to proceed as though a regulator were
2792 * configured. This allows systems such as those with software
2793 * controllable regulators for the CPU core only to be brought up more
2796 void regulator_use_dummy_regulator(void)
2798 board_wants_dummy_regulator
= true;
2800 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator
);
2803 * rdev_get_drvdata - get rdev regulator driver data
2806 * Get rdev regulator driver private data. This call can be used in the
2807 * regulator driver context.
2809 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
2811 return rdev
->reg_data
;
2813 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
2816 * regulator_get_drvdata - get regulator driver data
2817 * @regulator: regulator
2819 * Get regulator driver private data. This call can be used in the consumer
2820 * driver context when non API regulator specific functions need to be called.
2822 void *regulator_get_drvdata(struct regulator
*regulator
)
2824 return regulator
->rdev
->reg_data
;
2826 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
2829 * regulator_set_drvdata - set regulator driver data
2830 * @regulator: regulator
2833 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
2835 regulator
->rdev
->reg_data
= data
;
2837 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
2840 * regulator_get_id - get regulator ID
2843 int rdev_get_id(struct regulator_dev
*rdev
)
2845 return rdev
->desc
->id
;
2847 EXPORT_SYMBOL_GPL(rdev_get_id
);
2849 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
2853 EXPORT_SYMBOL_GPL(rdev_get_dev
);
2855 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
2857 return reg_init_data
->driver_data
;
2859 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
2861 static int __init
regulator_init(void)
2865 ret
= class_register(®ulator_class
);
2867 #ifdef CONFIG_DEBUG_FS
2868 debugfs_root
= debugfs_create_dir("regulator", NULL
);
2869 if (IS_ERR(debugfs_root
) || !debugfs_root
) {
2870 pr_warn("regulator: Failed to create debugfs directory\n");
2871 debugfs_root
= NULL
;
2875 regulator_dummy_init();
2880 /* init early to allow our consumers to complete system booting */
2881 core_initcall(regulator_init
);
2883 static int __init
regulator_init_complete(void)
2885 struct regulator_dev
*rdev
;
2886 struct regulator_ops
*ops
;
2887 struct regulation_constraints
*c
;
2890 mutex_lock(®ulator_list_mutex
);
2892 /* If we have a full configuration then disable any regulators
2893 * which are not in use or always_on. This will become the
2894 * default behaviour in the future.
2896 list_for_each_entry(rdev
, ®ulator_list
, list
) {
2897 ops
= rdev
->desc
->ops
;
2898 c
= rdev
->constraints
;
2900 if (!ops
->disable
|| (c
&& c
->always_on
))
2903 mutex_lock(&rdev
->mutex
);
2905 if (rdev
->use_count
)
2908 /* If we can't read the status assume it's on. */
2909 if (ops
->is_enabled
)
2910 enabled
= ops
->is_enabled(rdev
);
2917 if (has_full_constraints
) {
2918 /* We log since this may kill the system if it
2920 rdev_info(rdev
, "disabling\n");
2921 ret
= ops
->disable(rdev
);
2923 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
2926 /* The intention is that in future we will
2927 * assume that full constraints are provided
2928 * so warn even if we aren't going to do
2931 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
2935 mutex_unlock(&rdev
->mutex
);
2938 mutex_unlock(®ulator_list_mutex
);
2942 late_initcall(regulator_init_complete
);