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/device.h>
19 #include <linux/err.h>
20 #include <linux/mutex.h>
21 #include <linux/suspend.h>
22 #include <linux/regulator/consumer.h>
23 #include <linux/regulator/driver.h>
24 #include <linux/regulator/machine.h>
26 #define REGULATOR_VERSION "0.5"
28 static DEFINE_MUTEX(regulator_list_mutex
);
29 static LIST_HEAD(regulator_list
);
30 static LIST_HEAD(regulator_map_list
);
33 * struct regulator_dev
35 * Voltage / Current regulator class device. One for each regulator.
37 struct regulator_dev
{
38 struct regulator_desc
*desc
;
41 /* lists we belong to */
42 struct list_head list
; /* list of all regulators */
43 struct list_head slist
; /* list of supplied regulators */
46 struct list_head consumer_list
; /* consumers we supply */
47 struct list_head supply_list
; /* regulators we supply */
49 struct blocking_notifier_head notifier
;
50 struct mutex mutex
; /* consumer lock */
53 struct regulation_constraints
*constraints
;
54 struct regulator_dev
*supply
; /* for tree */
56 void *reg_data
; /* regulator_dev data */
60 * struct regulator_map
62 * Used to provide symbolic supply names to devices.
64 struct regulator_map
{
65 struct list_head list
;
68 struct regulator_dev
*regulator
;
74 * One for each consumer device.
78 struct list_head list
;
82 int enabled
; /* count of client enables */
84 struct device_attribute dev_attr
;
85 struct regulator_dev
*rdev
;
88 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
89 static int _regulator_disable(struct regulator_dev
*rdev
);
90 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
91 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
92 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
93 static void _notifier_call_chain(struct regulator_dev
*rdev
,
94 unsigned long event
, void *data
);
96 /* gets the regulator for a given consumer device */
97 static struct regulator
*get_device_regulator(struct device
*dev
)
99 struct regulator
*regulator
= NULL
;
100 struct regulator_dev
*rdev
;
102 mutex_lock(®ulator_list_mutex
);
103 list_for_each_entry(rdev
, ®ulator_list
, list
) {
104 mutex_lock(&rdev
->mutex
);
105 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
106 if (regulator
->dev
== dev
) {
107 mutex_unlock(&rdev
->mutex
);
108 mutex_unlock(®ulator_list_mutex
);
112 mutex_unlock(&rdev
->mutex
);
114 mutex_unlock(®ulator_list_mutex
);
118 /* Platform voltage constraint check */
119 static int regulator_check_voltage(struct regulator_dev
*rdev
,
120 int *min_uV
, int *max_uV
)
122 BUG_ON(*min_uV
> *max_uV
);
124 if (!rdev
->constraints
) {
125 printk(KERN_ERR
"%s: no constraints for %s\n", __func__
,
129 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
130 printk(KERN_ERR
"%s: operation not allowed for %s\n",
131 __func__
, rdev
->desc
->name
);
135 if (*max_uV
> rdev
->constraints
->max_uV
)
136 *max_uV
= rdev
->constraints
->max_uV
;
137 if (*min_uV
< rdev
->constraints
->min_uV
)
138 *min_uV
= rdev
->constraints
->min_uV
;
140 if (*min_uV
> *max_uV
)
146 /* current constraint check */
147 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
148 int *min_uA
, int *max_uA
)
150 BUG_ON(*min_uA
> *max_uA
);
152 if (!rdev
->constraints
) {
153 printk(KERN_ERR
"%s: no constraints for %s\n", __func__
,
157 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
158 printk(KERN_ERR
"%s: operation not allowed for %s\n",
159 __func__
, rdev
->desc
->name
);
163 if (*max_uA
> rdev
->constraints
->max_uA
)
164 *max_uA
= rdev
->constraints
->max_uA
;
165 if (*min_uA
< rdev
->constraints
->min_uA
)
166 *min_uA
= rdev
->constraints
->min_uA
;
168 if (*min_uA
> *max_uA
)
174 /* operating mode constraint check */
175 static int regulator_check_mode(struct regulator_dev
*rdev
, int mode
)
178 case REGULATOR_MODE_FAST
:
179 case REGULATOR_MODE_NORMAL
:
180 case REGULATOR_MODE_IDLE
:
181 case REGULATOR_MODE_STANDBY
:
187 if (!rdev
->constraints
) {
188 printk(KERN_ERR
"%s: no constraints for %s\n", __func__
,
192 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
193 printk(KERN_ERR
"%s: operation not allowed for %s\n",
194 __func__
, rdev
->desc
->name
);
197 if (!(rdev
->constraints
->valid_modes_mask
& mode
)) {
198 printk(KERN_ERR
"%s: invalid mode %x for %s\n",
199 __func__
, mode
, rdev
->desc
->name
);
205 /* dynamic regulator mode switching constraint check */
206 static int regulator_check_drms(struct regulator_dev
*rdev
)
208 if (!rdev
->constraints
) {
209 printk(KERN_ERR
"%s: no constraints for %s\n", __func__
,
213 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
214 printk(KERN_ERR
"%s: operation not allowed for %s\n",
215 __func__
, rdev
->desc
->name
);
221 static ssize_t
device_requested_uA_show(struct device
*dev
,
222 struct device_attribute
*attr
, char *buf
)
224 struct regulator
*regulator
;
226 regulator
= get_device_regulator(dev
);
227 if (regulator
== NULL
)
230 return sprintf(buf
, "%d\n", regulator
->uA_load
);
233 static ssize_t
regulator_uV_show(struct device
*dev
,
234 struct device_attribute
*attr
, char *buf
)
236 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
239 mutex_lock(&rdev
->mutex
);
240 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
241 mutex_unlock(&rdev
->mutex
);
245 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
247 static ssize_t
regulator_uA_show(struct device
*dev
,
248 struct device_attribute
*attr
, char *buf
)
250 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
252 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
254 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
256 static ssize_t
regulator_name_show(struct device
*dev
,
257 struct device_attribute
*attr
, char *buf
)
259 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
262 if (rdev
->constraints
->name
)
263 name
= rdev
->constraints
->name
;
264 else if (rdev
->desc
->name
)
265 name
= rdev
->desc
->name
;
269 return sprintf(buf
, "%s\n", name
);
272 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
275 case REGULATOR_MODE_FAST
:
276 return sprintf(buf
, "fast\n");
277 case REGULATOR_MODE_NORMAL
:
278 return sprintf(buf
, "normal\n");
279 case REGULATOR_MODE_IDLE
:
280 return sprintf(buf
, "idle\n");
281 case REGULATOR_MODE_STANDBY
:
282 return sprintf(buf
, "standby\n");
284 return sprintf(buf
, "unknown\n");
287 static ssize_t
regulator_opmode_show(struct device
*dev
,
288 struct device_attribute
*attr
, char *buf
)
290 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
292 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
294 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
296 static ssize_t
regulator_print_state(char *buf
, int state
)
299 return sprintf(buf
, "enabled\n");
301 return sprintf(buf
, "disabled\n");
303 return sprintf(buf
, "unknown\n");
306 static ssize_t
regulator_state_show(struct device
*dev
,
307 struct device_attribute
*attr
, char *buf
)
309 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
311 return regulator_print_state(buf
, _regulator_is_enabled(rdev
));
313 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
315 static ssize_t
regulator_min_uA_show(struct device
*dev
,
316 struct device_attribute
*attr
, char *buf
)
318 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
320 if (!rdev
->constraints
)
321 return sprintf(buf
, "constraint not defined\n");
323 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
325 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
327 static ssize_t
regulator_max_uA_show(struct device
*dev
,
328 struct device_attribute
*attr
, char *buf
)
330 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
332 if (!rdev
->constraints
)
333 return sprintf(buf
, "constraint not defined\n");
335 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
337 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
339 static ssize_t
regulator_min_uV_show(struct device
*dev
,
340 struct device_attribute
*attr
, char *buf
)
342 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
344 if (!rdev
->constraints
)
345 return sprintf(buf
, "constraint not defined\n");
347 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
349 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
351 static ssize_t
regulator_max_uV_show(struct device
*dev
,
352 struct device_attribute
*attr
, char *buf
)
354 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
356 if (!rdev
->constraints
)
357 return sprintf(buf
, "constraint not defined\n");
359 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
361 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
363 static ssize_t
regulator_total_uA_show(struct device
*dev
,
364 struct device_attribute
*attr
, char *buf
)
366 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
367 struct regulator
*regulator
;
370 mutex_lock(&rdev
->mutex
);
371 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
372 uA
+= regulator
->uA_load
;
373 mutex_unlock(&rdev
->mutex
);
374 return sprintf(buf
, "%d\n", uA
);
376 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
378 static ssize_t
regulator_num_users_show(struct device
*dev
,
379 struct device_attribute
*attr
, char *buf
)
381 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
382 return sprintf(buf
, "%d\n", rdev
->use_count
);
385 static ssize_t
regulator_type_show(struct device
*dev
,
386 struct device_attribute
*attr
, char *buf
)
388 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
390 switch (rdev
->desc
->type
) {
391 case REGULATOR_VOLTAGE
:
392 return sprintf(buf
, "voltage\n");
393 case REGULATOR_CURRENT
:
394 return sprintf(buf
, "current\n");
396 return sprintf(buf
, "unknown\n");
399 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
400 struct device_attribute
*attr
, char *buf
)
402 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
404 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
406 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
407 regulator_suspend_mem_uV_show
, NULL
);
409 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
410 struct device_attribute
*attr
, char *buf
)
412 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
414 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
416 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
417 regulator_suspend_disk_uV_show
, NULL
);
419 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
420 struct device_attribute
*attr
, char *buf
)
422 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
424 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
426 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
427 regulator_suspend_standby_uV_show
, NULL
);
429 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
430 struct device_attribute
*attr
, char *buf
)
432 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
434 return regulator_print_opmode(buf
,
435 rdev
->constraints
->state_mem
.mode
);
437 static DEVICE_ATTR(suspend_mem_mode
, 0444,
438 regulator_suspend_mem_mode_show
, NULL
);
440 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
441 struct device_attribute
*attr
, char *buf
)
443 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
445 return regulator_print_opmode(buf
,
446 rdev
->constraints
->state_disk
.mode
);
448 static DEVICE_ATTR(suspend_disk_mode
, 0444,
449 regulator_suspend_disk_mode_show
, NULL
);
451 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
452 struct device_attribute
*attr
, char *buf
)
454 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
456 return regulator_print_opmode(buf
,
457 rdev
->constraints
->state_standby
.mode
);
459 static DEVICE_ATTR(suspend_standby_mode
, 0444,
460 regulator_suspend_standby_mode_show
, NULL
);
462 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
463 struct device_attribute
*attr
, char *buf
)
465 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
467 return regulator_print_state(buf
,
468 rdev
->constraints
->state_mem
.enabled
);
470 static DEVICE_ATTR(suspend_mem_state
, 0444,
471 regulator_suspend_mem_state_show
, NULL
);
473 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
474 struct device_attribute
*attr
, char *buf
)
476 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
478 return regulator_print_state(buf
,
479 rdev
->constraints
->state_disk
.enabled
);
481 static DEVICE_ATTR(suspend_disk_state
, 0444,
482 regulator_suspend_disk_state_show
, NULL
);
484 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
485 struct device_attribute
*attr
, char *buf
)
487 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
489 return regulator_print_state(buf
,
490 rdev
->constraints
->state_standby
.enabled
);
492 static DEVICE_ATTR(suspend_standby_state
, 0444,
493 regulator_suspend_standby_state_show
, NULL
);
497 * These are the only attributes are present for all regulators.
498 * Other attributes are a function of regulator functionality.
500 static struct device_attribute regulator_dev_attrs
[] = {
501 __ATTR(name
, 0444, regulator_name_show
, NULL
),
502 __ATTR(num_users
, 0444, regulator_num_users_show
, NULL
),
503 __ATTR(type
, 0444, regulator_type_show
, NULL
),
507 static void regulator_dev_release(struct device
*dev
)
509 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
513 static struct class regulator_class
= {
515 .dev_release
= regulator_dev_release
,
516 .dev_attrs
= regulator_dev_attrs
,
519 /* Calculate the new optimum regulator operating mode based on the new total
520 * consumer load. All locks held by caller */
521 static void drms_uA_update(struct regulator_dev
*rdev
)
523 struct regulator
*sibling
;
524 int current_uA
= 0, output_uV
, input_uV
, err
;
527 err
= regulator_check_drms(rdev
);
528 if (err
< 0 || !rdev
->desc
->ops
->get_optimum_mode
||
529 !rdev
->desc
->ops
->get_voltage
|| !rdev
->desc
->ops
->set_mode
);
532 /* get output voltage */
533 output_uV
= rdev
->desc
->ops
->get_voltage(rdev
);
537 /* get input voltage */
538 if (rdev
->supply
&& rdev
->supply
->desc
->ops
->get_voltage
)
539 input_uV
= rdev
->supply
->desc
->ops
->get_voltage(rdev
->supply
);
541 input_uV
= rdev
->constraints
->input_uV
;
545 /* calc total requested load */
546 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
547 current_uA
+= sibling
->uA_load
;
549 /* now get the optimum mode for our new total regulator load */
550 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
551 output_uV
, current_uA
);
553 /* check the new mode is allowed */
554 err
= regulator_check_mode(rdev
, mode
);
556 rdev
->desc
->ops
->set_mode(rdev
, mode
);
559 static int suspend_set_state(struct regulator_dev
*rdev
,
560 struct regulator_state
*rstate
)
564 /* enable & disable are mandatory for suspend control */
565 if (!rdev
->desc
->ops
->set_suspend_enable
||
566 !rdev
->desc
->ops
->set_suspend_disable
) {
567 printk(KERN_ERR
"%s: no way to set suspend state\n",
573 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
575 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
577 printk(KERN_ERR
"%s: failed to enabled/disable\n", __func__
);
581 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
582 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
584 printk(KERN_ERR
"%s: failed to set voltage\n",
590 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
591 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
593 printk(KERN_ERR
"%s: failed to set mode\n", __func__
);
600 /* locks held by caller */
601 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
603 if (!rdev
->constraints
)
607 case PM_SUSPEND_STANDBY
:
608 return suspend_set_state(rdev
,
609 &rdev
->constraints
->state_standby
);
611 return suspend_set_state(rdev
,
612 &rdev
->constraints
->state_mem
);
614 return suspend_set_state(rdev
,
615 &rdev
->constraints
->state_disk
);
621 static void print_constraints(struct regulator_dev
*rdev
)
623 struct regulation_constraints
*constraints
= rdev
->constraints
;
627 if (rdev
->desc
->type
== REGULATOR_VOLTAGE
) {
628 if (constraints
->min_uV
== constraints
->max_uV
)
629 count
= sprintf(buf
, "%d mV ",
630 constraints
->min_uV
/ 1000);
632 count
= sprintf(buf
, "%d <--> %d mV ",
633 constraints
->min_uV
/ 1000,
634 constraints
->max_uV
/ 1000);
636 if (constraints
->min_uA
== constraints
->max_uA
)
637 count
= sprintf(buf
, "%d mA ",
638 constraints
->min_uA
/ 1000);
640 count
= sprintf(buf
, "%d <--> %d mA ",
641 constraints
->min_uA
/ 1000,
642 constraints
->max_uA
/ 1000);
644 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
645 count
+= sprintf(buf
+ count
, "fast ");
646 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
647 count
+= sprintf(buf
+ count
, "normal ");
648 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
649 count
+= sprintf(buf
+ count
, "idle ");
650 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
651 count
+= sprintf(buf
+ count
, "standby");
653 printk(KERN_INFO
"regulator: %s: %s\n", rdev
->desc
->name
, buf
);
657 * set_machine_constraints - sets regulator constraints
658 * @rdev: regulator source
660 * Allows platform initialisation code to define and constrain
661 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
662 * Constraints *must* be set by platform code in order for some
663 * regulator operations to proceed i.e. set_voltage, set_current_limit,
666 static int set_machine_constraints(struct regulator_dev
*rdev
,
667 struct regulation_constraints
*constraints
)
671 struct regulator_ops
*ops
= rdev
->desc
->ops
;
673 if (constraints
->name
)
674 name
= constraints
->name
;
675 else if (rdev
->desc
->name
)
676 name
= rdev
->desc
->name
;
680 rdev
->constraints
= constraints
;
682 /* do we need to apply the constraint voltage */
683 if (rdev
->constraints
->apply_uV
&&
684 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
&&
686 ret
= ops
->set_voltage(rdev
,
687 rdev
->constraints
->min_uV
, rdev
->constraints
->max_uV
);
689 printk(KERN_ERR
"%s: failed to apply %duV constraint to %s\n",
691 rdev
->constraints
->min_uV
, name
);
692 rdev
->constraints
= NULL
;
697 /* are we enabled at boot time by firmware / bootloader */
698 if (rdev
->constraints
->boot_on
)
701 /* do we need to setup our suspend state */
702 if (constraints
->initial_state
) {
703 ret
= suspend_prepare(rdev
, constraints
->initial_state
);
705 printk(KERN_ERR
"%s: failed to set suspend state for %s\n",
707 rdev
->constraints
= NULL
;
712 /* if always_on is set then turn the regulator on if it's not
714 if (constraints
->always_on
&& ops
->enable
&&
715 ((ops
->is_enabled
&& !ops
->is_enabled(rdev
)) ||
716 (!ops
->is_enabled
&& !constraints
->boot_on
))) {
717 ret
= ops
->enable(rdev
);
719 printk(KERN_ERR
"%s: failed to enable %s\n",
721 rdev
->constraints
= NULL
;
726 print_constraints(rdev
);
732 * set_supply - set regulator supply regulator
733 * @rdev: regulator name
734 * @supply_rdev: supply regulator name
736 * Called by platform initialisation code to set the supply regulator for this
737 * regulator. This ensures that a regulators supply will also be enabled by the
738 * core if it's child is enabled.
740 static int set_supply(struct regulator_dev
*rdev
,
741 struct regulator_dev
*supply_rdev
)
745 err
= sysfs_create_link(&rdev
->dev
.kobj
, &supply_rdev
->dev
.kobj
,
749 "%s: could not add device link %s err %d\n",
750 __func__
, supply_rdev
->dev
.kobj
.name
, err
);
753 rdev
->supply
= supply_rdev
;
754 list_add(&rdev
->slist
, &supply_rdev
->supply_list
);
760 * set_consumer_device_supply: Bind a regulator to a symbolic supply
761 * @rdev: regulator source
762 * @consumer_dev: device the supply applies to
763 * @supply: symbolic name for supply
765 * Allows platform initialisation code to map physical regulator
766 * sources to symbolic names for supplies for use by devices. Devices
767 * should use these symbolic names to request regulators, avoiding the
768 * need to provide board-specific regulator names as platform data.
770 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
771 struct device
*consumer_dev
, const char *supply
)
773 struct regulator_map
*node
;
778 node
= kmalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
782 node
->regulator
= rdev
;
783 node
->dev
= consumer_dev
;
784 node
->supply
= supply
;
786 list_add(&node
->list
, ®ulator_map_list
);
790 static void unset_consumer_device_supply(struct regulator_dev
*rdev
,
791 struct device
*consumer_dev
)
793 struct regulator_map
*node
, *n
;
795 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
796 if (rdev
== node
->regulator
&&
797 consumer_dev
== node
->dev
) {
798 list_del(&node
->list
);
805 #define REG_STR_SIZE 32
807 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
809 const char *supply_name
)
811 struct regulator
*regulator
;
812 char buf
[REG_STR_SIZE
];
815 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
816 if (regulator
== NULL
)
819 mutex_lock(&rdev
->mutex
);
820 regulator
->rdev
= rdev
;
821 list_add(®ulator
->list
, &rdev
->consumer_list
);
824 /* create a 'requested_microamps_name' sysfs entry */
825 size
= scnprintf(buf
, REG_STR_SIZE
, "microamps_requested_%s",
827 if (size
>= REG_STR_SIZE
)
830 regulator
->dev
= dev
;
831 regulator
->dev_attr
.attr
.name
= kstrdup(buf
, GFP_KERNEL
);
832 if (regulator
->dev_attr
.attr
.name
== NULL
)
835 regulator
->dev_attr
.attr
.owner
= THIS_MODULE
;
836 regulator
->dev_attr
.attr
.mode
= 0444;
837 regulator
->dev_attr
.show
= device_requested_uA_show
;
838 err
= device_create_file(dev
, ®ulator
->dev_attr
);
840 printk(KERN_WARNING
"%s: could not add regulator_dev"
841 " load sysfs\n", __func__
);
845 /* also add a link to the device sysfs entry */
846 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
847 dev
->kobj
.name
, supply_name
);
848 if (size
>= REG_STR_SIZE
)
851 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
852 if (regulator
->supply_name
== NULL
)
855 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
859 "%s: could not add device link %s err %d\n",
860 __func__
, dev
->kobj
.name
, err
);
861 device_remove_file(dev
, ®ulator
->dev_attr
);
865 mutex_unlock(&rdev
->mutex
);
868 kfree(regulator
->supply_name
);
870 device_remove_file(regulator
->dev
, ®ulator
->dev_attr
);
872 kfree(regulator
->dev_attr
.attr
.name
);
874 list_del(®ulator
->list
);
876 mutex_unlock(&rdev
->mutex
);
881 * regulator_get - lookup and obtain a reference to a regulator.
882 * @dev: device for regulator "consumer"
883 * @id: Supply name or regulator ID.
885 * Returns a struct regulator corresponding to the regulator producer,
886 * or IS_ERR() condition containing errno. Use of supply names
887 * configured via regulator_set_device_supply() is strongly
890 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
892 struct regulator_dev
*rdev
;
893 struct regulator_map
*map
;
894 struct regulator
*regulator
= ERR_PTR(-ENODEV
);
897 printk(KERN_ERR
"regulator: get() with no identifier\n");
901 mutex_lock(®ulator_list_mutex
);
903 list_for_each_entry(map
, ®ulator_map_list
, list
) {
904 if (dev
== map
->dev
&&
905 strcmp(map
->supply
, id
) == 0) {
906 rdev
= map
->regulator
;
910 printk(KERN_ERR
"regulator: Unable to get requested regulator: %s\n",
912 mutex_unlock(®ulator_list_mutex
);
916 if (!try_module_get(rdev
->owner
))
919 regulator
= create_regulator(rdev
, dev
, id
);
920 if (regulator
== NULL
) {
921 regulator
= ERR_PTR(-ENOMEM
);
922 module_put(rdev
->owner
);
926 mutex_unlock(®ulator_list_mutex
);
929 EXPORT_SYMBOL_GPL(regulator_get
);
932 * regulator_put - "free" the regulator source
933 * @regulator: regulator source
935 * Note: drivers must ensure that all regulator_enable calls made on this
936 * regulator source are balanced by regulator_disable calls prior to calling
939 void regulator_put(struct regulator
*regulator
)
941 struct regulator_dev
*rdev
;
943 if (regulator
== NULL
|| IS_ERR(regulator
))
946 mutex_lock(®ulator_list_mutex
);
947 rdev
= regulator
->rdev
;
949 if (WARN(regulator
->enabled
, "Releasing supply %s while enabled\n",
950 regulator
->supply_name
))
951 _regulator_disable(rdev
);
953 /* remove any sysfs entries */
954 if (regulator
->dev
) {
955 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
956 kfree(regulator
->supply_name
);
957 device_remove_file(regulator
->dev
, ®ulator
->dev_attr
);
958 kfree(regulator
->dev_attr
.attr
.name
);
960 list_del(®ulator
->list
);
963 module_put(rdev
->owner
);
964 mutex_unlock(®ulator_list_mutex
);
966 EXPORT_SYMBOL_GPL(regulator_put
);
968 /* locks held by regulator_enable() */
969 static int _regulator_enable(struct regulator_dev
*rdev
)
973 if (!rdev
->constraints
) {
974 printk(KERN_ERR
"%s: %s has no constraints\n",
975 __func__
, rdev
->desc
->name
);
979 /* do we need to enable the supply regulator first */
981 ret
= _regulator_enable(rdev
->supply
);
983 printk(KERN_ERR
"%s: failed to enable %s: %d\n",
984 __func__
, rdev
->desc
->name
, ret
);
989 /* check voltage and requested load before enabling */
990 if (rdev
->desc
->ops
->enable
) {
992 if (rdev
->constraints
&&
993 (rdev
->constraints
->valid_ops_mask
&
994 REGULATOR_CHANGE_DRMS
))
995 drms_uA_update(rdev
);
997 ret
= rdev
->desc
->ops
->enable(rdev
);
999 printk(KERN_ERR
"%s: failed to enable %s: %d\n",
1000 __func__
, rdev
->desc
->name
, ret
);
1011 * regulator_enable - enable regulator output
1012 * @regulator: regulator source
1014 * Enable the regulator output at the predefined voltage or current value.
1015 * NOTE: the output value can be set by other drivers, boot loader or may be
1016 * hardwired in the regulator. Calls to regulator_enable() must be balanced
1017 * with calls to regulator_disable().
1019 int regulator_enable(struct regulator
*regulator
)
1021 struct regulator_dev
*rdev
= regulator
->rdev
;
1024 mutex_lock(&rdev
->mutex
);
1025 if (regulator
->enabled
== 0)
1026 ret
= _regulator_enable(rdev
);
1027 else if (regulator
->enabled
< 0)
1030 regulator
->enabled
++;
1031 mutex_unlock(&rdev
->mutex
);
1034 EXPORT_SYMBOL_GPL(regulator_enable
);
1036 /* locks held by regulator_disable() */
1037 static int _regulator_disable(struct regulator_dev
*rdev
)
1041 /* are we the last user and permitted to disable ? */
1042 if (rdev
->use_count
== 1 && !rdev
->constraints
->always_on
) {
1044 /* we are last user */
1045 if (rdev
->desc
->ops
->disable
) {
1046 ret
= rdev
->desc
->ops
->disable(rdev
);
1048 printk(KERN_ERR
"%s: failed to disable %s\n",
1049 __func__
, rdev
->desc
->name
);
1054 /* decrease our supplies ref count and disable if required */
1056 _regulator_disable(rdev
->supply
);
1058 rdev
->use_count
= 0;
1059 } else if (rdev
->use_count
> 1) {
1061 if (rdev
->constraints
&&
1062 (rdev
->constraints
->valid_ops_mask
&
1063 REGULATOR_CHANGE_DRMS
))
1064 drms_uA_update(rdev
);
1072 * regulator_disable - disable regulator output
1073 * @regulator: regulator source
1075 * Disable the regulator output voltage or current.
1077 * NOTE: this will only disable the regulator output if no other consumer
1078 * devices have it enabled. Calls to regulator_enable() must be balanced with
1079 * calls to regulator_disable().
1081 int regulator_disable(struct regulator
*regulator
)
1083 struct regulator_dev
*rdev
= regulator
->rdev
;
1086 mutex_lock(&rdev
->mutex
);
1087 if (regulator
->enabled
== 1) {
1088 ret
= _regulator_disable(rdev
);
1090 regulator
->uA_load
= 0;
1091 } else if (WARN(regulator
->enabled
<= 0,
1092 "unbalanced disables for supply %s\n",
1093 regulator
->supply_name
))
1096 regulator
->enabled
--;
1097 mutex_unlock(&rdev
->mutex
);
1100 EXPORT_SYMBOL_GPL(regulator_disable
);
1102 /* locks held by regulator_force_disable() */
1103 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1108 if (rdev
->desc
->ops
->disable
) {
1109 /* ah well, who wants to live forever... */
1110 ret
= rdev
->desc
->ops
->disable(rdev
);
1112 printk(KERN_ERR
"%s: failed to force disable %s\n",
1113 __func__
, rdev
->desc
->name
);
1116 /* notify other consumers that power has been forced off */
1117 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
,
1121 /* decrease our supplies ref count and disable if required */
1123 _regulator_disable(rdev
->supply
);
1125 rdev
->use_count
= 0;
1130 * regulator_force_disable - force disable regulator output
1131 * @regulator: regulator source
1133 * Forcibly disable the regulator output voltage or current.
1134 * NOTE: this *will* disable the regulator output even if other consumer
1135 * devices have it enabled. This should be used for situations when device
1136 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1138 int regulator_force_disable(struct regulator
*regulator
)
1142 mutex_lock(®ulator
->rdev
->mutex
);
1143 regulator
->enabled
= 0;
1144 regulator
->uA_load
= 0;
1145 ret
= _regulator_force_disable(regulator
->rdev
);
1146 mutex_unlock(®ulator
->rdev
->mutex
);
1149 EXPORT_SYMBOL_GPL(regulator_force_disable
);
1151 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
1155 mutex_lock(&rdev
->mutex
);
1158 if (!rdev
->desc
->ops
->is_enabled
) {
1163 ret
= rdev
->desc
->ops
->is_enabled(rdev
);
1165 mutex_unlock(&rdev
->mutex
);
1170 * regulator_is_enabled - is the regulator output enabled
1171 * @regulator: regulator source
1173 * Returns positive if the regulator driver backing the source/client
1174 * has requested that the device be enabled, zero if it hasn't, else a
1175 * negative errno code.
1177 * Note that the device backing this regulator handle can have multiple
1178 * users, so it might be enabled even if regulator_enable() was never
1179 * called for this particular source.
1181 int regulator_is_enabled(struct regulator
*regulator
)
1183 return _regulator_is_enabled(regulator
->rdev
);
1185 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
1188 * regulator_set_voltage - set regulator output voltage
1189 * @regulator: regulator source
1190 * @min_uV: Minimum required voltage in uV
1191 * @max_uV: Maximum acceptable voltage in uV
1193 * Sets a voltage regulator to the desired output voltage. This can be set
1194 * during any regulator state. IOW, regulator can be disabled or enabled.
1196 * If the regulator is enabled then the voltage will change to the new value
1197 * immediately otherwise if the regulator is disabled the regulator will
1198 * output at the new voltage when enabled.
1200 * NOTE: If the regulator is shared between several devices then the lowest
1201 * request voltage that meets the system constraints will be used.
1202 * Regulator system constraints must be set for this regulator before
1203 * calling this function otherwise this call will fail.
1205 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
1207 struct regulator_dev
*rdev
= regulator
->rdev
;
1210 mutex_lock(&rdev
->mutex
);
1213 if (!rdev
->desc
->ops
->set_voltage
) {
1218 /* constraints check */
1219 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
1222 regulator
->min_uV
= min_uV
;
1223 regulator
->max_uV
= max_uV
;
1224 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
);
1227 mutex_unlock(&rdev
->mutex
);
1230 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
1232 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
1235 if (rdev
->desc
->ops
->get_voltage
)
1236 return rdev
->desc
->ops
->get_voltage(rdev
);
1242 * regulator_get_voltage - get regulator output voltage
1243 * @regulator: regulator source
1245 * This returns the current regulator voltage in uV.
1247 * NOTE: If the regulator is disabled it will return the voltage value. This
1248 * function should not be used to determine regulator state.
1250 int regulator_get_voltage(struct regulator
*regulator
)
1254 mutex_lock(®ulator
->rdev
->mutex
);
1256 ret
= _regulator_get_voltage(regulator
->rdev
);
1258 mutex_unlock(®ulator
->rdev
->mutex
);
1262 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
1265 * regulator_set_current_limit - set regulator output current limit
1266 * @regulator: regulator source
1267 * @min_uA: Minimuum supported current in uA
1268 * @max_uA: Maximum supported current in uA
1270 * Sets current sink to the desired output current. This can be set during
1271 * any regulator state. IOW, regulator can be disabled or enabled.
1273 * If the regulator is enabled then the current will change to the new value
1274 * immediately otherwise if the regulator is disabled the regulator will
1275 * output at the new current when enabled.
1277 * NOTE: Regulator system constraints must be set for this regulator before
1278 * calling this function otherwise this call will fail.
1280 int regulator_set_current_limit(struct regulator
*regulator
,
1281 int min_uA
, int max_uA
)
1283 struct regulator_dev
*rdev
= regulator
->rdev
;
1286 mutex_lock(&rdev
->mutex
);
1289 if (!rdev
->desc
->ops
->set_current_limit
) {
1294 /* constraints check */
1295 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
1299 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
1301 mutex_unlock(&rdev
->mutex
);
1304 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
1306 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
1310 mutex_lock(&rdev
->mutex
);
1313 if (!rdev
->desc
->ops
->get_current_limit
) {
1318 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
1320 mutex_unlock(&rdev
->mutex
);
1325 * regulator_get_current_limit - get regulator output current
1326 * @regulator: regulator source
1328 * This returns the current supplied by the specified current sink in uA.
1330 * NOTE: If the regulator is disabled it will return the current value. This
1331 * function should not be used to determine regulator state.
1333 int regulator_get_current_limit(struct regulator
*regulator
)
1335 return _regulator_get_current_limit(regulator
->rdev
);
1337 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
1340 * regulator_set_mode - set regulator operating mode
1341 * @regulator: regulator source
1342 * @mode: operating mode - one of the REGULATOR_MODE constants
1344 * Set regulator operating mode to increase regulator efficiency or improve
1345 * regulation performance.
1347 * NOTE: Regulator system constraints must be set for this regulator before
1348 * calling this function otherwise this call will fail.
1350 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
1352 struct regulator_dev
*rdev
= regulator
->rdev
;
1355 mutex_lock(&rdev
->mutex
);
1358 if (!rdev
->desc
->ops
->set_mode
) {
1363 /* constraints check */
1364 ret
= regulator_check_mode(rdev
, mode
);
1368 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
1370 mutex_unlock(&rdev
->mutex
);
1373 EXPORT_SYMBOL_GPL(regulator_set_mode
);
1375 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
1379 mutex_lock(&rdev
->mutex
);
1382 if (!rdev
->desc
->ops
->get_mode
) {
1387 ret
= rdev
->desc
->ops
->get_mode(rdev
);
1389 mutex_unlock(&rdev
->mutex
);
1394 * regulator_get_mode - get regulator operating mode
1395 * @regulator: regulator source
1397 * Get the current regulator operating mode.
1399 unsigned int regulator_get_mode(struct regulator
*regulator
)
1401 return _regulator_get_mode(regulator
->rdev
);
1403 EXPORT_SYMBOL_GPL(regulator_get_mode
);
1406 * regulator_set_optimum_mode - set regulator optimum operating mode
1407 * @regulator: regulator source
1408 * @uA_load: load current
1410 * Notifies the regulator core of a new device load. This is then used by
1411 * DRMS (if enabled by constraints) to set the most efficient regulator
1412 * operating mode for the new regulator loading.
1414 * Consumer devices notify their supply regulator of the maximum power
1415 * they will require (can be taken from device datasheet in the power
1416 * consumption tables) when they change operational status and hence power
1417 * state. Examples of operational state changes that can affect power
1418 * consumption are :-
1420 * o Device is opened / closed.
1421 * o Device I/O is about to begin or has just finished.
1422 * o Device is idling in between work.
1424 * This information is also exported via sysfs to userspace.
1426 * DRMS will sum the total requested load on the regulator and change
1427 * to the most efficient operating mode if platform constraints allow.
1429 * Returns the new regulator mode or error.
1431 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
1433 struct regulator_dev
*rdev
= regulator
->rdev
;
1434 struct regulator
*consumer
;
1435 int ret
, output_uV
, input_uV
, total_uA_load
= 0;
1438 mutex_lock(&rdev
->mutex
);
1440 regulator
->uA_load
= uA_load
;
1441 ret
= regulator_check_drms(rdev
);
1447 if (!rdev
->desc
->ops
->get_optimum_mode
)
1450 /* get output voltage */
1451 output_uV
= rdev
->desc
->ops
->get_voltage(rdev
);
1452 if (output_uV
<= 0) {
1453 printk(KERN_ERR
"%s: invalid output voltage found for %s\n",
1454 __func__
, rdev
->desc
->name
);
1458 /* get input voltage */
1459 if (rdev
->supply
&& rdev
->supply
->desc
->ops
->get_voltage
)
1460 input_uV
= rdev
->supply
->desc
->ops
->get_voltage(rdev
->supply
);
1462 input_uV
= rdev
->constraints
->input_uV
;
1463 if (input_uV
<= 0) {
1464 printk(KERN_ERR
"%s: invalid input voltage found for %s\n",
1465 __func__
, rdev
->desc
->name
);
1469 /* calc total requested load for this regulator */
1470 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
1471 total_uA_load
+= consumer
->uA_load
;
1473 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
1474 input_uV
, output_uV
,
1476 ret
= regulator_check_mode(rdev
, mode
);
1478 printk(KERN_ERR
"%s: failed to get optimum mode for %s @"
1479 " %d uA %d -> %d uV\n", __func__
, rdev
->desc
->name
,
1480 total_uA_load
, input_uV
, output_uV
);
1484 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
1486 printk(KERN_ERR
"%s: failed to set optimum mode %x for %s\n",
1487 __func__
, mode
, rdev
->desc
->name
);
1492 mutex_unlock(&rdev
->mutex
);
1495 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
1498 * regulator_register_notifier - register regulator event notifier
1499 * @regulator: regulator source
1500 * @nb: notifier block
1502 * Register notifier block to receive regulator events.
1504 int regulator_register_notifier(struct regulator
*regulator
,
1505 struct notifier_block
*nb
)
1507 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
1510 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
1513 * regulator_unregister_notifier - unregister regulator event notifier
1514 * @regulator: regulator source
1515 * @nb: notifier block
1517 * Unregister regulator event notifier block.
1519 int regulator_unregister_notifier(struct regulator
*regulator
,
1520 struct notifier_block
*nb
)
1522 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
1525 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
1527 /* notify regulator consumers and downstream regulator consumers */
1528 static void _notifier_call_chain(struct regulator_dev
*rdev
,
1529 unsigned long event
, void *data
)
1531 struct regulator_dev
*_rdev
;
1533 /* call rdev chain first */
1534 mutex_lock(&rdev
->mutex
);
1535 blocking_notifier_call_chain(&rdev
->notifier
, event
, NULL
);
1536 mutex_unlock(&rdev
->mutex
);
1538 /* now notify regulator we supply */
1539 list_for_each_entry(_rdev
, &rdev
->supply_list
, slist
)
1540 _notifier_call_chain(_rdev
, event
, data
);
1544 * regulator_bulk_get - get multiple regulator consumers
1546 * @dev: Device to supply
1547 * @num_consumers: Number of consumers to register
1548 * @consumers: Configuration of consumers; clients are stored here.
1550 * @return 0 on success, an errno on failure.
1552 * This helper function allows drivers to get several regulator
1553 * consumers in one operation. If any of the regulators cannot be
1554 * acquired then any regulators that were allocated will be freed
1555 * before returning to the caller.
1557 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
1558 struct regulator_bulk_data
*consumers
)
1563 for (i
= 0; i
< num_consumers
; i
++)
1564 consumers
[i
].consumer
= NULL
;
1566 for (i
= 0; i
< num_consumers
; i
++) {
1567 consumers
[i
].consumer
= regulator_get(dev
,
1568 consumers
[i
].supply
);
1569 if (IS_ERR(consumers
[i
].consumer
)) {
1570 dev_err(dev
, "Failed to get supply '%s'\n",
1571 consumers
[i
].supply
);
1572 ret
= PTR_ERR(consumers
[i
].consumer
);
1573 consumers
[i
].consumer
= NULL
;
1581 for (i
= 0; i
< num_consumers
&& consumers
[i
].consumer
; i
++)
1582 regulator_put(consumers
[i
].consumer
);
1586 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
1589 * regulator_bulk_enable - enable multiple regulator consumers
1591 * @num_consumers: Number of consumers
1592 * @consumers: Consumer data; clients are stored here.
1593 * @return 0 on success, an errno on failure
1595 * This convenience API allows consumers to enable multiple regulator
1596 * clients in a single API call. If any consumers cannot be enabled
1597 * then any others that were enabled will be disabled again prior to
1600 int regulator_bulk_enable(int num_consumers
,
1601 struct regulator_bulk_data
*consumers
)
1606 for (i
= 0; i
< num_consumers
; i
++) {
1607 ret
= regulator_enable(consumers
[i
].consumer
);
1615 printk(KERN_ERR
"Failed to enable %s\n", consumers
[i
].supply
);
1616 for (i
= 0; i
< num_consumers
; i
++)
1617 regulator_disable(consumers
[i
].consumer
);
1621 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
1624 * regulator_bulk_disable - disable multiple regulator consumers
1626 * @num_consumers: Number of consumers
1627 * @consumers: Consumer data; clients are stored here.
1628 * @return 0 on success, an errno on failure
1630 * This convenience API allows consumers to disable multiple regulator
1631 * clients in a single API call. If any consumers cannot be enabled
1632 * then any others that were disabled will be disabled again prior to
1635 int regulator_bulk_disable(int num_consumers
,
1636 struct regulator_bulk_data
*consumers
)
1641 for (i
= 0; i
< num_consumers
; i
++) {
1642 ret
= regulator_disable(consumers
[i
].consumer
);
1650 printk(KERN_ERR
"Failed to disable %s\n", consumers
[i
].supply
);
1651 for (i
= 0; i
< num_consumers
; i
++)
1652 regulator_enable(consumers
[i
].consumer
);
1656 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
1659 * regulator_bulk_free - free multiple regulator consumers
1661 * @num_consumers: Number of consumers
1662 * @consumers: Consumer data; clients are stored here.
1664 * This convenience API allows consumers to free multiple regulator
1665 * clients in a single API call.
1667 void regulator_bulk_free(int num_consumers
,
1668 struct regulator_bulk_data
*consumers
)
1672 for (i
= 0; i
< num_consumers
; i
++) {
1673 regulator_put(consumers
[i
].consumer
);
1674 consumers
[i
].consumer
= NULL
;
1677 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
1680 * regulator_notifier_call_chain - call regulator event notifier
1681 * @rdev: regulator source
1682 * @event: notifier block
1683 * @data: callback-specific data.
1685 * Called by regulator drivers to notify clients a regulator event has
1686 * occurred. We also notify regulator clients downstream.
1688 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
1689 unsigned long event
, void *data
)
1691 _notifier_call_chain(rdev
, event
, data
);
1695 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
1698 * To avoid cluttering sysfs (and memory) with useless state, only
1699 * create attributes that can be meaningfully displayed.
1701 static int add_regulator_attributes(struct regulator_dev
*rdev
)
1703 struct device
*dev
= &rdev
->dev
;
1704 struct regulator_ops
*ops
= rdev
->desc
->ops
;
1707 /* some attributes need specific methods to be displayed */
1708 if (ops
->get_voltage
) {
1709 status
= device_create_file(dev
, &dev_attr_microvolts
);
1713 if (ops
->get_current_limit
) {
1714 status
= device_create_file(dev
, &dev_attr_microamps
);
1718 if (ops
->get_mode
) {
1719 status
= device_create_file(dev
, &dev_attr_opmode
);
1723 if (ops
->is_enabled
) {
1724 status
= device_create_file(dev
, &dev_attr_state
);
1729 /* some attributes are type-specific */
1730 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
1731 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
1736 /* all the other attributes exist to support constraints;
1737 * don't show them if there are no constraints, or if the
1738 * relevant supporting methods are missing.
1740 if (!rdev
->constraints
)
1743 /* constraints need specific supporting methods */
1744 if (ops
->set_voltage
) {
1745 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
1748 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
1752 if (ops
->set_current_limit
) {
1753 status
= device_create_file(dev
, &dev_attr_min_microamps
);
1756 status
= device_create_file(dev
, &dev_attr_max_microamps
);
1761 /* suspend mode constraints need multiple supporting methods */
1762 if (!(ops
->set_suspend_enable
&& ops
->set_suspend_disable
))
1765 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
1768 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
1771 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
1775 if (ops
->set_suspend_voltage
) {
1776 status
= device_create_file(dev
,
1777 &dev_attr_suspend_standby_microvolts
);
1780 status
= device_create_file(dev
,
1781 &dev_attr_suspend_mem_microvolts
);
1784 status
= device_create_file(dev
,
1785 &dev_attr_suspend_disk_microvolts
);
1790 if (ops
->set_suspend_mode
) {
1791 status
= device_create_file(dev
,
1792 &dev_attr_suspend_standby_mode
);
1795 status
= device_create_file(dev
,
1796 &dev_attr_suspend_mem_mode
);
1799 status
= device_create_file(dev
,
1800 &dev_attr_suspend_disk_mode
);
1809 * regulator_register - register regulator
1810 * @regulator_desc: regulator to register
1811 * @dev: struct device for the regulator
1812 * @driver_data: private regulator data
1814 * Called by regulator drivers to register a regulator.
1815 * Returns 0 on success.
1817 struct regulator_dev
*regulator_register(struct regulator_desc
*regulator_desc
,
1818 struct device
*dev
, void *driver_data
)
1820 static atomic_t regulator_no
= ATOMIC_INIT(0);
1821 struct regulator_dev
*rdev
;
1822 struct regulator_init_data
*init_data
= dev
->platform_data
;
1825 if (regulator_desc
== NULL
)
1826 return ERR_PTR(-EINVAL
);
1828 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
1829 return ERR_PTR(-EINVAL
);
1831 if (!regulator_desc
->type
== REGULATOR_VOLTAGE
&&
1832 !regulator_desc
->type
== REGULATOR_CURRENT
)
1833 return ERR_PTR(-EINVAL
);
1836 return ERR_PTR(-EINVAL
);
1838 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
1840 return ERR_PTR(-ENOMEM
);
1842 mutex_lock(®ulator_list_mutex
);
1844 mutex_init(&rdev
->mutex
);
1845 rdev
->reg_data
= driver_data
;
1846 rdev
->owner
= regulator_desc
->owner
;
1847 rdev
->desc
= regulator_desc
;
1848 INIT_LIST_HEAD(&rdev
->consumer_list
);
1849 INIT_LIST_HEAD(&rdev
->supply_list
);
1850 INIT_LIST_HEAD(&rdev
->list
);
1851 INIT_LIST_HEAD(&rdev
->slist
);
1852 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
1854 /* preform any regulator specific init */
1855 if (init_data
->regulator_init
) {
1856 ret
= init_data
->regulator_init(rdev
->reg_data
);
1861 /* register with sysfs */
1862 rdev
->dev
.class = ®ulator_class
;
1863 rdev
->dev
.parent
= dev
;
1864 dev_set_name(&rdev
->dev
, "regulator.%d",
1865 atomic_inc_return(®ulator_no
) - 1);
1866 ret
= device_register(&rdev
->dev
);
1870 dev_set_drvdata(&rdev
->dev
, rdev
);
1872 /* set regulator constraints */
1873 ret
= set_machine_constraints(rdev
, &init_data
->constraints
);
1877 /* add attributes supported by this regulator */
1878 ret
= add_regulator_attributes(rdev
);
1882 /* set supply regulator if it exists */
1883 if (init_data
->supply_regulator_dev
) {
1884 ret
= set_supply(rdev
,
1885 dev_get_drvdata(init_data
->supply_regulator_dev
));
1890 /* add consumers devices */
1891 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
1892 ret
= set_consumer_device_supply(rdev
,
1893 init_data
->consumer_supplies
[i
].dev
,
1894 init_data
->consumer_supplies
[i
].supply
);
1896 for (--i
; i
>= 0; i
--)
1897 unset_consumer_device_supply(rdev
,
1898 init_data
->consumer_supplies
[i
].dev
);
1903 list_add(&rdev
->list
, ®ulator_list
);
1905 mutex_unlock(®ulator_list_mutex
);
1909 device_unregister(&rdev
->dev
);
1912 rdev
= ERR_PTR(ret
);
1915 EXPORT_SYMBOL_GPL(regulator_register
);
1918 * regulator_unregister - unregister regulator
1919 * @rdev: regulator to unregister
1921 * Called by regulator drivers to unregister a regulator.
1923 void regulator_unregister(struct regulator_dev
*rdev
)
1928 mutex_lock(®ulator_list_mutex
);
1929 list_del(&rdev
->list
);
1931 sysfs_remove_link(&rdev
->dev
.kobj
, "supply");
1932 device_unregister(&rdev
->dev
);
1933 mutex_unlock(®ulator_list_mutex
);
1935 EXPORT_SYMBOL_GPL(regulator_unregister
);
1938 * regulator_suspend_prepare: prepare regulators for system wide suspend
1939 * @state: system suspend state
1941 * Configure each regulator with it's suspend operating parameters for state.
1942 * This will usually be called by machine suspend code prior to supending.
1944 int regulator_suspend_prepare(suspend_state_t state
)
1946 struct regulator_dev
*rdev
;
1949 /* ON is handled by regulator active state */
1950 if (state
== PM_SUSPEND_ON
)
1953 mutex_lock(®ulator_list_mutex
);
1954 list_for_each_entry(rdev
, ®ulator_list
, list
) {
1956 mutex_lock(&rdev
->mutex
);
1957 ret
= suspend_prepare(rdev
, state
);
1958 mutex_unlock(&rdev
->mutex
);
1961 printk(KERN_ERR
"%s: failed to prepare %s\n",
1962 __func__
, rdev
->desc
->name
);
1967 mutex_unlock(®ulator_list_mutex
);
1970 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
1973 * rdev_get_drvdata - get rdev regulator driver data
1976 * Get rdev regulator driver private data. This call can be used in the
1977 * regulator driver context.
1979 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
1981 return rdev
->reg_data
;
1983 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
1986 * regulator_get_drvdata - get regulator driver data
1987 * @regulator: regulator
1989 * Get regulator driver private data. This call can be used in the consumer
1990 * driver context when non API regulator specific functions need to be called.
1992 void *regulator_get_drvdata(struct regulator
*regulator
)
1994 return regulator
->rdev
->reg_data
;
1996 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
1999 * regulator_set_drvdata - set regulator driver data
2000 * @regulator: regulator
2003 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
2005 regulator
->rdev
->reg_data
= data
;
2007 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
2010 * regulator_get_id - get regulator ID
2013 int rdev_get_id(struct regulator_dev
*rdev
)
2015 return rdev
->desc
->id
;
2017 EXPORT_SYMBOL_GPL(rdev_get_id
);
2019 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
2023 EXPORT_SYMBOL_GPL(rdev_get_dev
);
2025 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
2027 return reg_init_data
->driver_data
;
2029 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
2031 static int __init
regulator_init(void)
2033 printk(KERN_INFO
"regulator: core version %s\n", REGULATOR_VERSION
);
2034 return class_register(®ulator_class
);
2037 /* init early to allow our consumers to complete system booting */
2038 core_initcall(regulator_init
);