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/delay.h>
23 #include <linux/regulator/consumer.h>
24 #include <linux/regulator/driver.h>
25 #include <linux/regulator/machine.h>
27 #define REGULATOR_VERSION "0.5"
29 static DEFINE_MUTEX(regulator_list_mutex
);
30 static LIST_HEAD(regulator_list
);
31 static LIST_HEAD(regulator_map_list
);
32 static int has_full_constraints
;
35 * struct regulator_map
37 * Used to provide symbolic supply names to devices.
39 struct regulator_map
{
40 struct list_head list
;
41 const char *dev_name
; /* The dev_name() for the consumer */
43 struct regulator_dev
*regulator
;
49 * One for each consumer device.
53 struct list_head list
;
58 struct device_attribute dev_attr
;
59 struct regulator_dev
*rdev
;
62 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
63 static int _regulator_disable(struct regulator_dev
*rdev
);
64 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
65 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
66 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
67 static void _notifier_call_chain(struct regulator_dev
*rdev
,
68 unsigned long event
, void *data
);
70 static const char *rdev_get_name(struct regulator_dev
*rdev
)
72 if (rdev
->constraints
&& rdev
->constraints
->name
)
73 return rdev
->constraints
->name
;
74 else if (rdev
->desc
->name
)
75 return rdev
->desc
->name
;
80 /* gets the regulator for a given consumer device */
81 static struct regulator
*get_device_regulator(struct device
*dev
)
83 struct regulator
*regulator
= NULL
;
84 struct regulator_dev
*rdev
;
86 mutex_lock(®ulator_list_mutex
);
87 list_for_each_entry(rdev
, ®ulator_list
, list
) {
88 mutex_lock(&rdev
->mutex
);
89 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
90 if (regulator
->dev
== dev
) {
91 mutex_unlock(&rdev
->mutex
);
92 mutex_unlock(®ulator_list_mutex
);
96 mutex_unlock(&rdev
->mutex
);
98 mutex_unlock(®ulator_list_mutex
);
102 /* Platform voltage constraint check */
103 static int regulator_check_voltage(struct regulator_dev
*rdev
,
104 int *min_uV
, int *max_uV
)
106 BUG_ON(*min_uV
> *max_uV
);
108 if (!rdev
->constraints
) {
109 printk(KERN_ERR
"%s: no constraints for %s\n", __func__
,
110 rdev_get_name(rdev
));
113 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_VOLTAGE
)) {
114 printk(KERN_ERR
"%s: operation not allowed for %s\n",
115 __func__
, rdev_get_name(rdev
));
119 if (*max_uV
> rdev
->constraints
->max_uV
)
120 *max_uV
= rdev
->constraints
->max_uV
;
121 if (*min_uV
< rdev
->constraints
->min_uV
)
122 *min_uV
= rdev
->constraints
->min_uV
;
124 if (*min_uV
> *max_uV
)
130 /* current constraint check */
131 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
132 int *min_uA
, int *max_uA
)
134 BUG_ON(*min_uA
> *max_uA
);
136 if (!rdev
->constraints
) {
137 printk(KERN_ERR
"%s: no constraints for %s\n", __func__
,
138 rdev_get_name(rdev
));
141 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_CURRENT
)) {
142 printk(KERN_ERR
"%s: operation not allowed for %s\n",
143 __func__
, rdev_get_name(rdev
));
147 if (*max_uA
> rdev
->constraints
->max_uA
)
148 *max_uA
= rdev
->constraints
->max_uA
;
149 if (*min_uA
< rdev
->constraints
->min_uA
)
150 *min_uA
= rdev
->constraints
->min_uA
;
152 if (*min_uA
> *max_uA
)
158 /* operating mode constraint check */
159 static int regulator_check_mode(struct regulator_dev
*rdev
, int mode
)
162 case REGULATOR_MODE_FAST
:
163 case REGULATOR_MODE_NORMAL
:
164 case REGULATOR_MODE_IDLE
:
165 case REGULATOR_MODE_STANDBY
:
171 if (!rdev
->constraints
) {
172 printk(KERN_ERR
"%s: no constraints for %s\n", __func__
,
173 rdev_get_name(rdev
));
176 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_MODE
)) {
177 printk(KERN_ERR
"%s: operation not allowed for %s\n",
178 __func__
, rdev_get_name(rdev
));
181 if (!(rdev
->constraints
->valid_modes_mask
& mode
)) {
182 printk(KERN_ERR
"%s: invalid mode %x for %s\n",
183 __func__
, mode
, rdev_get_name(rdev
));
189 /* dynamic regulator mode switching constraint check */
190 static int regulator_check_drms(struct regulator_dev
*rdev
)
192 if (!rdev
->constraints
) {
193 printk(KERN_ERR
"%s: no constraints for %s\n", __func__
,
194 rdev_get_name(rdev
));
197 if (!(rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
)) {
198 printk(KERN_ERR
"%s: operation not allowed for %s\n",
199 __func__
, rdev_get_name(rdev
));
205 static ssize_t
device_requested_uA_show(struct device
*dev
,
206 struct device_attribute
*attr
, char *buf
)
208 struct regulator
*regulator
;
210 regulator
= get_device_regulator(dev
);
211 if (regulator
== NULL
)
214 return sprintf(buf
, "%d\n", regulator
->uA_load
);
217 static ssize_t
regulator_uV_show(struct device
*dev
,
218 struct device_attribute
*attr
, char *buf
)
220 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
223 mutex_lock(&rdev
->mutex
);
224 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
225 mutex_unlock(&rdev
->mutex
);
229 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
231 static ssize_t
regulator_uA_show(struct device
*dev
,
232 struct device_attribute
*attr
, char *buf
)
234 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
236 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
238 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
240 static ssize_t
regulator_name_show(struct device
*dev
,
241 struct device_attribute
*attr
, char *buf
)
243 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
245 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
248 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
251 case REGULATOR_MODE_FAST
:
252 return sprintf(buf
, "fast\n");
253 case REGULATOR_MODE_NORMAL
:
254 return sprintf(buf
, "normal\n");
255 case REGULATOR_MODE_IDLE
:
256 return sprintf(buf
, "idle\n");
257 case REGULATOR_MODE_STANDBY
:
258 return sprintf(buf
, "standby\n");
260 return sprintf(buf
, "unknown\n");
263 static ssize_t
regulator_opmode_show(struct device
*dev
,
264 struct device_attribute
*attr
, char *buf
)
266 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
268 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
270 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
272 static ssize_t
regulator_print_state(char *buf
, int state
)
275 return sprintf(buf
, "enabled\n");
277 return sprintf(buf
, "disabled\n");
279 return sprintf(buf
, "unknown\n");
282 static ssize_t
regulator_state_show(struct device
*dev
,
283 struct device_attribute
*attr
, char *buf
)
285 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
288 mutex_lock(&rdev
->mutex
);
289 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
290 mutex_unlock(&rdev
->mutex
);
294 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
296 static ssize_t
regulator_status_show(struct device
*dev
,
297 struct device_attribute
*attr
, char *buf
)
299 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
303 status
= rdev
->desc
->ops
->get_status(rdev
);
308 case REGULATOR_STATUS_OFF
:
311 case REGULATOR_STATUS_ON
:
314 case REGULATOR_STATUS_ERROR
:
317 case REGULATOR_STATUS_FAST
:
320 case REGULATOR_STATUS_NORMAL
:
323 case REGULATOR_STATUS_IDLE
:
326 case REGULATOR_STATUS_STANDBY
:
333 return sprintf(buf
, "%s\n", label
);
335 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
337 static ssize_t
regulator_min_uA_show(struct device
*dev
,
338 struct device_attribute
*attr
, char *buf
)
340 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
342 if (!rdev
->constraints
)
343 return sprintf(buf
, "constraint not defined\n");
345 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
347 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
349 static ssize_t
regulator_max_uA_show(struct device
*dev
,
350 struct device_attribute
*attr
, char *buf
)
352 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
354 if (!rdev
->constraints
)
355 return sprintf(buf
, "constraint not defined\n");
357 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
359 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
361 static ssize_t
regulator_min_uV_show(struct device
*dev
,
362 struct device_attribute
*attr
, char *buf
)
364 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
366 if (!rdev
->constraints
)
367 return sprintf(buf
, "constraint not defined\n");
369 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
371 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
373 static ssize_t
regulator_max_uV_show(struct device
*dev
,
374 struct device_attribute
*attr
, char *buf
)
376 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
378 if (!rdev
->constraints
)
379 return sprintf(buf
, "constraint not defined\n");
381 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
383 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
385 static ssize_t
regulator_total_uA_show(struct device
*dev
,
386 struct device_attribute
*attr
, char *buf
)
388 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
389 struct regulator
*regulator
;
392 mutex_lock(&rdev
->mutex
);
393 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
394 uA
+= regulator
->uA_load
;
395 mutex_unlock(&rdev
->mutex
);
396 return sprintf(buf
, "%d\n", uA
);
398 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
400 static ssize_t
regulator_num_users_show(struct device
*dev
,
401 struct device_attribute
*attr
, char *buf
)
403 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
404 return sprintf(buf
, "%d\n", rdev
->use_count
);
407 static ssize_t
regulator_type_show(struct device
*dev
,
408 struct device_attribute
*attr
, char *buf
)
410 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
412 switch (rdev
->desc
->type
) {
413 case REGULATOR_VOLTAGE
:
414 return sprintf(buf
, "voltage\n");
415 case REGULATOR_CURRENT
:
416 return sprintf(buf
, "current\n");
418 return sprintf(buf
, "unknown\n");
421 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
422 struct device_attribute
*attr
, char *buf
)
424 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
426 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
428 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
429 regulator_suspend_mem_uV_show
, NULL
);
431 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
432 struct device_attribute
*attr
, char *buf
)
434 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
436 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
438 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
439 regulator_suspend_disk_uV_show
, NULL
);
441 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
442 struct device_attribute
*attr
, char *buf
)
444 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
446 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
448 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
449 regulator_suspend_standby_uV_show
, NULL
);
451 static ssize_t
regulator_suspend_mem_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_mem
.mode
);
459 static DEVICE_ATTR(suspend_mem_mode
, 0444,
460 regulator_suspend_mem_mode_show
, NULL
);
462 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
463 struct device_attribute
*attr
, char *buf
)
465 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
467 return regulator_print_opmode(buf
,
468 rdev
->constraints
->state_disk
.mode
);
470 static DEVICE_ATTR(suspend_disk_mode
, 0444,
471 regulator_suspend_disk_mode_show
, NULL
);
473 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
474 struct device_attribute
*attr
, char *buf
)
476 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
478 return regulator_print_opmode(buf
,
479 rdev
->constraints
->state_standby
.mode
);
481 static DEVICE_ATTR(suspend_standby_mode
, 0444,
482 regulator_suspend_standby_mode_show
, NULL
);
484 static ssize_t
regulator_suspend_mem_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_mem
.enabled
);
492 static DEVICE_ATTR(suspend_mem_state
, 0444,
493 regulator_suspend_mem_state_show
, NULL
);
495 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
496 struct device_attribute
*attr
, char *buf
)
498 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
500 return regulator_print_state(buf
,
501 rdev
->constraints
->state_disk
.enabled
);
503 static DEVICE_ATTR(suspend_disk_state
, 0444,
504 regulator_suspend_disk_state_show
, NULL
);
506 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
507 struct device_attribute
*attr
, char *buf
)
509 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
511 return regulator_print_state(buf
,
512 rdev
->constraints
->state_standby
.enabled
);
514 static DEVICE_ATTR(suspend_standby_state
, 0444,
515 regulator_suspend_standby_state_show
, NULL
);
519 * These are the only attributes are present for all regulators.
520 * Other attributes are a function of regulator functionality.
522 static struct device_attribute regulator_dev_attrs
[] = {
523 __ATTR(name
, 0444, regulator_name_show
, NULL
),
524 __ATTR(num_users
, 0444, regulator_num_users_show
, NULL
),
525 __ATTR(type
, 0444, regulator_type_show
, NULL
),
529 static void regulator_dev_release(struct device
*dev
)
531 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
535 static struct class regulator_class
= {
537 .dev_release
= regulator_dev_release
,
538 .dev_attrs
= regulator_dev_attrs
,
541 /* Calculate the new optimum regulator operating mode based on the new total
542 * consumer load. All locks held by caller */
543 static void drms_uA_update(struct regulator_dev
*rdev
)
545 struct regulator
*sibling
;
546 int current_uA
= 0, output_uV
, input_uV
, err
;
549 err
= regulator_check_drms(rdev
);
550 if (err
< 0 || !rdev
->desc
->ops
->get_optimum_mode
||
551 !rdev
->desc
->ops
->get_voltage
|| !rdev
->desc
->ops
->set_mode
)
554 /* get output voltage */
555 output_uV
= rdev
->desc
->ops
->get_voltage(rdev
);
559 /* get input voltage */
560 if (rdev
->supply
&& rdev
->supply
->desc
->ops
->get_voltage
)
561 input_uV
= rdev
->supply
->desc
->ops
->get_voltage(rdev
->supply
);
563 input_uV
= rdev
->constraints
->input_uV
;
567 /* calc total requested load */
568 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
569 current_uA
+= sibling
->uA_load
;
571 /* now get the optimum mode for our new total regulator load */
572 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
573 output_uV
, current_uA
);
575 /* check the new mode is allowed */
576 err
= regulator_check_mode(rdev
, mode
);
578 rdev
->desc
->ops
->set_mode(rdev
, mode
);
581 static int suspend_set_state(struct regulator_dev
*rdev
,
582 struct regulator_state
*rstate
)
587 can_set_state
= rdev
->desc
->ops
->set_suspend_enable
&&
588 rdev
->desc
->ops
->set_suspend_disable
;
590 /* If we have no suspend mode configration don't set anything;
591 * only warn if the driver actually makes the suspend mode
594 if (!rstate
->enabled
&& !rstate
->disabled
) {
596 printk(KERN_WARNING
"%s: No configuration for %s\n",
597 __func__
, rdev_get_name(rdev
));
601 if (rstate
->enabled
&& rstate
->disabled
) {
602 printk(KERN_ERR
"%s: invalid configuration for %s\n",
603 __func__
, rdev_get_name(rdev
));
607 if (!can_set_state
) {
608 printk(KERN_ERR
"%s: no way to set suspend state\n",
614 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
616 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
618 printk(KERN_ERR
"%s: failed to enabled/disable\n", __func__
);
622 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
623 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
625 printk(KERN_ERR
"%s: failed to set voltage\n",
631 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
632 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
634 printk(KERN_ERR
"%s: failed to set mode\n", __func__
);
641 /* locks held by caller */
642 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
644 if (!rdev
->constraints
)
648 case PM_SUSPEND_STANDBY
:
649 return suspend_set_state(rdev
,
650 &rdev
->constraints
->state_standby
);
652 return suspend_set_state(rdev
,
653 &rdev
->constraints
->state_mem
);
655 return suspend_set_state(rdev
,
656 &rdev
->constraints
->state_disk
);
662 static void print_constraints(struct regulator_dev
*rdev
)
664 struct regulation_constraints
*constraints
= rdev
->constraints
;
669 if (constraints
->min_uV
&& constraints
->max_uV
) {
670 if (constraints
->min_uV
== constraints
->max_uV
)
671 count
+= sprintf(buf
+ count
, "%d mV ",
672 constraints
->min_uV
/ 1000);
674 count
+= sprintf(buf
+ count
, "%d <--> %d mV ",
675 constraints
->min_uV
/ 1000,
676 constraints
->max_uV
/ 1000);
679 if (!constraints
->min_uV
||
680 constraints
->min_uV
!= constraints
->max_uV
) {
681 ret
= _regulator_get_voltage(rdev
);
683 count
+= sprintf(buf
+ count
, "at %d mV ", ret
/ 1000);
686 if (constraints
->min_uA
&& constraints
->max_uA
) {
687 if (constraints
->min_uA
== constraints
->max_uA
)
688 count
+= sprintf(buf
+ count
, "%d mA ",
689 constraints
->min_uA
/ 1000);
691 count
+= sprintf(buf
+ count
, "%d <--> %d mA ",
692 constraints
->min_uA
/ 1000,
693 constraints
->max_uA
/ 1000);
696 if (!constraints
->min_uA
||
697 constraints
->min_uA
!= constraints
->max_uA
) {
698 ret
= _regulator_get_current_limit(rdev
);
700 count
+= sprintf(buf
+ count
, "at %d uA ", ret
/ 1000);
703 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
704 count
+= sprintf(buf
+ count
, "fast ");
705 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
706 count
+= sprintf(buf
+ count
, "normal ");
707 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
708 count
+= sprintf(buf
+ count
, "idle ");
709 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
710 count
+= sprintf(buf
+ count
, "standby");
712 printk(KERN_INFO
"regulator: %s: %s\n", rdev_get_name(rdev
), buf
);
715 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
716 struct regulation_constraints
*constraints
)
718 struct regulator_ops
*ops
= rdev
->desc
->ops
;
719 const char *name
= rdev_get_name(rdev
);
722 /* do we need to apply the constraint voltage */
723 if (rdev
->constraints
->apply_uV
&&
724 rdev
->constraints
->min_uV
== rdev
->constraints
->max_uV
&&
726 ret
= ops
->set_voltage(rdev
,
727 rdev
->constraints
->min_uV
, rdev
->constraints
->max_uV
);
729 printk(KERN_ERR
"%s: failed to apply %duV constraint to %s\n",
731 rdev
->constraints
->min_uV
, name
);
732 rdev
->constraints
= NULL
;
737 /* constrain machine-level voltage specs to fit
738 * the actual range supported by this regulator.
740 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
741 int count
= rdev
->desc
->n_voltages
;
743 int min_uV
= INT_MAX
;
744 int max_uV
= INT_MIN
;
745 int cmin
= constraints
->min_uV
;
746 int cmax
= constraints
->max_uV
;
748 /* it's safe to autoconfigure fixed-voltage supplies
749 and the constraints are used by list_voltage. */
750 if (count
== 1 && !cmin
) {
753 constraints
->min_uV
= cmin
;
754 constraints
->max_uV
= cmax
;
757 /* voltage constraints are optional */
758 if ((cmin
== 0) && (cmax
== 0))
761 /* else require explicit machine-level constraints */
762 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
763 pr_err("%s: %s '%s' voltage constraints\n",
764 __func__
, "invalid", name
);
768 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
769 for (i
= 0; i
< count
; i
++) {
772 value
= ops
->list_voltage(rdev
, i
);
776 /* maybe adjust [min_uV..max_uV] */
777 if (value
>= cmin
&& value
< min_uV
)
779 if (value
<= cmax
&& value
> max_uV
)
783 /* final: [min_uV..max_uV] valid iff constraints valid */
784 if (max_uV
< min_uV
) {
785 pr_err("%s: %s '%s' voltage constraints\n",
786 __func__
, "unsupportable", name
);
790 /* use regulator's subset of machine constraints */
791 if (constraints
->min_uV
< min_uV
) {
792 pr_debug("%s: override '%s' %s, %d -> %d\n",
793 __func__
, name
, "min_uV",
794 constraints
->min_uV
, min_uV
);
795 constraints
->min_uV
= min_uV
;
797 if (constraints
->max_uV
> max_uV
) {
798 pr_debug("%s: override '%s' %s, %d -> %d\n",
799 __func__
, name
, "max_uV",
800 constraints
->max_uV
, max_uV
);
801 constraints
->max_uV
= max_uV
;
809 * set_machine_constraints - sets regulator constraints
810 * @rdev: regulator source
811 * @constraints: constraints to apply
813 * Allows platform initialisation code to define and constrain
814 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
815 * Constraints *must* be set by platform code in order for some
816 * regulator operations to proceed i.e. set_voltage, set_current_limit,
819 static int set_machine_constraints(struct regulator_dev
*rdev
,
820 struct regulation_constraints
*constraints
)
824 struct regulator_ops
*ops
= rdev
->desc
->ops
;
826 rdev
->constraints
= constraints
;
828 name
= rdev_get_name(rdev
);
830 ret
= machine_constraints_voltage(rdev
, constraints
);
834 /* do we need to setup our suspend state */
835 if (constraints
->initial_state
) {
836 ret
= suspend_prepare(rdev
, constraints
->initial_state
);
838 printk(KERN_ERR
"%s: failed to set suspend state for %s\n",
840 rdev
->constraints
= NULL
;
845 if (constraints
->initial_mode
) {
846 if (!ops
->set_mode
) {
847 printk(KERN_ERR
"%s: no set_mode operation for %s\n",
853 ret
= ops
->set_mode(rdev
, constraints
->initial_mode
);
856 "%s: failed to set initial mode for %s: %d\n",
857 __func__
, name
, ret
);
862 /* If the constraints say the regulator should be on at this point
863 * and we have control then make sure it is enabled.
865 if ((constraints
->always_on
|| constraints
->boot_on
) && ops
->enable
) {
866 ret
= ops
->enable(rdev
);
868 printk(KERN_ERR
"%s: failed to enable %s\n",
870 rdev
->constraints
= NULL
;
875 print_constraints(rdev
);
881 * set_supply - set regulator supply regulator
882 * @rdev: regulator name
883 * @supply_rdev: supply regulator name
885 * Called by platform initialisation code to set the supply regulator for this
886 * regulator. This ensures that a regulators supply will also be enabled by the
887 * core if it's child is enabled.
889 static int set_supply(struct regulator_dev
*rdev
,
890 struct regulator_dev
*supply_rdev
)
894 err
= sysfs_create_link(&rdev
->dev
.kobj
, &supply_rdev
->dev
.kobj
,
898 "%s: could not add device link %s err %d\n",
899 __func__
, supply_rdev
->dev
.kobj
.name
, err
);
902 rdev
->supply
= supply_rdev
;
903 list_add(&rdev
->slist
, &supply_rdev
->supply_list
);
909 * set_consumer_device_supply: Bind a regulator to a symbolic supply
910 * @rdev: regulator source
911 * @consumer_dev: device the supply applies to
912 * @consumer_dev_name: dev_name() string for device supply applies to
913 * @supply: symbolic name for supply
915 * Allows platform initialisation code to map physical regulator
916 * sources to symbolic names for supplies for use by devices. Devices
917 * should use these symbolic names to request regulators, avoiding the
918 * need to provide board-specific regulator names as platform data.
920 * Only one of consumer_dev and consumer_dev_name may be specified.
922 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
923 struct device
*consumer_dev
, const char *consumer_dev_name
,
926 struct regulator_map
*node
;
929 if (consumer_dev
&& consumer_dev_name
)
932 if (!consumer_dev_name
&& consumer_dev
)
933 consumer_dev_name
= dev_name(consumer_dev
);
938 if (consumer_dev_name
!= NULL
)
943 list_for_each_entry(node
, ®ulator_map_list
, list
) {
944 if (consumer_dev_name
!= node
->dev_name
)
946 if (strcmp(node
->supply
, supply
) != 0)
949 dev_dbg(consumer_dev
, "%s/%s is '%s' supply; fail %s/%s\n",
950 dev_name(&node
->regulator
->dev
),
951 node
->regulator
->desc
->name
,
953 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
957 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
961 node
->regulator
= rdev
;
962 node
->supply
= supply
;
965 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
966 if (node
->dev_name
== NULL
) {
972 list_add(&node
->list
, ®ulator_map_list
);
976 static void unset_consumer_device_supply(struct regulator_dev
*rdev
,
977 const char *consumer_dev_name
, struct device
*consumer_dev
)
979 struct regulator_map
*node
, *n
;
981 if (consumer_dev
&& !consumer_dev_name
)
982 consumer_dev_name
= dev_name(consumer_dev
);
984 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
985 if (rdev
!= node
->regulator
)
988 if (consumer_dev_name
&& node
->dev_name
&&
989 strcmp(consumer_dev_name
, node
->dev_name
))
992 list_del(&node
->list
);
993 kfree(node
->dev_name
);
999 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1001 struct regulator_map
*node
, *n
;
1003 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1004 if (rdev
== node
->regulator
) {
1005 list_del(&node
->list
);
1006 kfree(node
->dev_name
);
1013 #define REG_STR_SIZE 32
1015 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1017 const char *supply_name
)
1019 struct regulator
*regulator
;
1020 char buf
[REG_STR_SIZE
];
1023 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1024 if (regulator
== NULL
)
1027 mutex_lock(&rdev
->mutex
);
1028 regulator
->rdev
= rdev
;
1029 list_add(®ulator
->list
, &rdev
->consumer_list
);
1032 /* create a 'requested_microamps_name' sysfs entry */
1033 size
= scnprintf(buf
, REG_STR_SIZE
, "microamps_requested_%s",
1035 if (size
>= REG_STR_SIZE
)
1038 regulator
->dev
= dev
;
1039 regulator
->dev_attr
.attr
.name
= kstrdup(buf
, GFP_KERNEL
);
1040 if (regulator
->dev_attr
.attr
.name
== NULL
)
1043 regulator
->dev_attr
.attr
.owner
= THIS_MODULE
;
1044 regulator
->dev_attr
.attr
.mode
= 0444;
1045 regulator
->dev_attr
.show
= device_requested_uA_show
;
1046 err
= device_create_file(dev
, ®ulator
->dev_attr
);
1048 printk(KERN_WARNING
"%s: could not add regulator_dev"
1049 " load sysfs\n", __func__
);
1053 /* also add a link to the device sysfs entry */
1054 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1055 dev
->kobj
.name
, supply_name
);
1056 if (size
>= REG_STR_SIZE
)
1059 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1060 if (regulator
->supply_name
== NULL
)
1063 err
= sysfs_create_link(&rdev
->dev
.kobj
, &dev
->kobj
,
1067 "%s: could not add device link %s err %d\n",
1068 __func__
, dev
->kobj
.name
, err
);
1069 device_remove_file(dev
, ®ulator
->dev_attr
);
1073 mutex_unlock(&rdev
->mutex
);
1076 kfree(regulator
->supply_name
);
1078 device_remove_file(regulator
->dev
, ®ulator
->dev_attr
);
1080 kfree(regulator
->dev_attr
.attr
.name
);
1082 list_del(®ulator
->list
);
1084 mutex_unlock(&rdev
->mutex
);
1088 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1090 if (!rdev
->desc
->ops
->enable_time
)
1092 return rdev
->desc
->ops
->enable_time(rdev
);
1095 /* Internal regulator request function */
1096 static struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1099 struct regulator_dev
*rdev
;
1100 struct regulator_map
*map
;
1101 struct regulator
*regulator
= ERR_PTR(-ENODEV
);
1102 const char *devname
= NULL
;
1106 printk(KERN_ERR
"regulator: get() with no identifier\n");
1111 devname
= dev_name(dev
);
1113 mutex_lock(®ulator_list_mutex
);
1115 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1116 /* If the mapping has a device set up it must match */
1117 if (map
->dev_name
&&
1118 (!devname
|| strcmp(map
->dev_name
, devname
)))
1121 if (strcmp(map
->supply
, id
) == 0) {
1122 rdev
= map
->regulator
;
1126 mutex_unlock(®ulator_list_mutex
);
1130 if (rdev
->exclusive
) {
1131 regulator
= ERR_PTR(-EPERM
);
1135 if (exclusive
&& rdev
->open_count
) {
1136 regulator
= ERR_PTR(-EBUSY
);
1140 if (!try_module_get(rdev
->owner
))
1143 regulator
= create_regulator(rdev
, dev
, id
);
1144 if (regulator
== NULL
) {
1145 regulator
= ERR_PTR(-ENOMEM
);
1146 module_put(rdev
->owner
);
1151 rdev
->exclusive
= 1;
1153 ret
= _regulator_is_enabled(rdev
);
1155 rdev
->use_count
= 1;
1157 rdev
->use_count
= 0;
1161 mutex_unlock(®ulator_list_mutex
);
1167 * regulator_get - lookup and obtain a reference to a regulator.
1168 * @dev: device for regulator "consumer"
1169 * @id: Supply name or regulator ID.
1171 * Returns a struct regulator corresponding to the regulator producer,
1172 * or IS_ERR() condition containing errno.
1174 * Use of supply names configured via regulator_set_device_supply() is
1175 * strongly encouraged. It is recommended that the supply name used
1176 * should match the name used for the supply and/or the relevant
1177 * device pins in the datasheet.
1179 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1181 return _regulator_get(dev
, id
, 0);
1183 EXPORT_SYMBOL_GPL(regulator_get
);
1186 * regulator_get_exclusive - obtain exclusive access to a regulator.
1187 * @dev: device for regulator "consumer"
1188 * @id: Supply name or regulator ID.
1190 * Returns a struct regulator corresponding to the regulator producer,
1191 * or IS_ERR() condition containing errno. Other consumers will be
1192 * unable to obtain this reference is held and the use count for the
1193 * regulator will be initialised to reflect the current state of the
1196 * This is intended for use by consumers which cannot tolerate shared
1197 * use of the regulator such as those which need to force the
1198 * regulator off for correct operation of the hardware they are
1201 * Use of supply names configured via regulator_set_device_supply() is
1202 * strongly encouraged. It is recommended that the supply name used
1203 * should match the name used for the supply and/or the relevant
1204 * device pins in the datasheet.
1206 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1208 return _regulator_get(dev
, id
, 1);
1210 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1213 * regulator_put - "free" the regulator source
1214 * @regulator: regulator source
1216 * Note: drivers must ensure that all regulator_enable calls made on this
1217 * regulator source are balanced by regulator_disable calls prior to calling
1220 void regulator_put(struct regulator
*regulator
)
1222 struct regulator_dev
*rdev
;
1224 if (regulator
== NULL
|| IS_ERR(regulator
))
1227 mutex_lock(®ulator_list_mutex
);
1228 rdev
= regulator
->rdev
;
1230 /* remove any sysfs entries */
1231 if (regulator
->dev
) {
1232 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1233 kfree(regulator
->supply_name
);
1234 device_remove_file(regulator
->dev
, ®ulator
->dev_attr
);
1235 kfree(regulator
->dev_attr
.attr
.name
);
1237 list_del(®ulator
->list
);
1241 rdev
->exclusive
= 0;
1243 module_put(rdev
->owner
);
1244 mutex_unlock(®ulator_list_mutex
);
1246 EXPORT_SYMBOL_GPL(regulator_put
);
1248 static int _regulator_can_change_status(struct regulator_dev
*rdev
)
1250 if (!rdev
->constraints
)
1253 if (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_STATUS
)
1259 /* locks held by regulator_enable() */
1260 static int _regulator_enable(struct regulator_dev
*rdev
)
1264 /* do we need to enable the supply regulator first */
1266 ret
= _regulator_enable(rdev
->supply
);
1268 printk(KERN_ERR
"%s: failed to enable %s: %d\n",
1269 __func__
, rdev_get_name(rdev
), ret
);
1274 /* check voltage and requested load before enabling */
1275 if (rdev
->constraints
&&
1276 (rdev
->constraints
->valid_ops_mask
& REGULATOR_CHANGE_DRMS
))
1277 drms_uA_update(rdev
);
1279 if (rdev
->use_count
== 0) {
1280 /* The regulator may on if it's not switchable or left on */
1281 ret
= _regulator_is_enabled(rdev
);
1282 if (ret
== -EINVAL
|| ret
== 0) {
1283 if (!_regulator_can_change_status(rdev
))
1286 if (!rdev
->desc
->ops
->enable
)
1289 /* Query before enabling in case configuration
1291 ret
= _regulator_get_enable_time(rdev
);
1296 "%s: enable_time() failed for %s: %d\n",
1297 __func__
, rdev_get_name(rdev
),
1302 /* Allow the regulator to ramp; it would be useful
1303 * to extend this for bulk operations so that the
1304 * regulators can ramp together. */
1305 ret
= rdev
->desc
->ops
->enable(rdev
);
1310 mdelay(delay
/ 1000);
1314 } else if (ret
< 0) {
1315 printk(KERN_ERR
"%s: is_enabled() failed for %s: %d\n",
1316 __func__
, rdev_get_name(rdev
), ret
);
1319 /* Fallthrough on positive return values - already enabled */
1328 * regulator_enable - enable regulator output
1329 * @regulator: regulator source
1331 * Request that the regulator be enabled with the regulator output at
1332 * the predefined voltage or current value. Calls to regulator_enable()
1333 * must be balanced with calls to regulator_disable().
1335 * NOTE: the output value can be set by other drivers, boot loader or may be
1336 * hardwired in the regulator.
1338 int regulator_enable(struct regulator
*regulator
)
1340 struct regulator_dev
*rdev
= regulator
->rdev
;
1343 mutex_lock(&rdev
->mutex
);
1344 ret
= _regulator_enable(rdev
);
1345 mutex_unlock(&rdev
->mutex
);
1348 EXPORT_SYMBOL_GPL(regulator_enable
);
1350 /* locks held by regulator_disable() */
1351 static int _regulator_disable(struct regulator_dev
*rdev
)
1355 if (WARN(rdev
->use_count
<= 0,
1356 "unbalanced disables for %s\n",
1357 rdev_get_name(rdev
)))
1360 /* are we the last user and permitted to disable ? */
1361 if (rdev
->use_count
== 1 &&
1362 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
1364 /* we are last user */
1365 if (_regulator_can_change_status(rdev
) &&
1366 rdev
->desc
->ops
->disable
) {
1367 ret
= rdev
->desc
->ops
->disable(rdev
);
1369 printk(KERN_ERR
"%s: failed to disable %s\n",
1370 __func__
, rdev_get_name(rdev
));
1374 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
1378 /* decrease our supplies ref count and disable if required */
1380 _regulator_disable(rdev
->supply
);
1382 rdev
->use_count
= 0;
1383 } else if (rdev
->use_count
> 1) {
1385 if (rdev
->constraints
&&
1386 (rdev
->constraints
->valid_ops_mask
&
1387 REGULATOR_CHANGE_DRMS
))
1388 drms_uA_update(rdev
);
1396 * regulator_disable - disable regulator output
1397 * @regulator: regulator source
1399 * Disable the regulator output voltage or current. Calls to
1400 * regulator_enable() must be balanced with calls to
1401 * regulator_disable().
1403 * NOTE: this will only disable the regulator output if no other consumer
1404 * devices have it enabled, the regulator device supports disabling and
1405 * machine constraints permit this operation.
1407 int regulator_disable(struct regulator
*regulator
)
1409 struct regulator_dev
*rdev
= regulator
->rdev
;
1412 mutex_lock(&rdev
->mutex
);
1413 ret
= _regulator_disable(rdev
);
1414 mutex_unlock(&rdev
->mutex
);
1417 EXPORT_SYMBOL_GPL(regulator_disable
);
1419 /* locks held by regulator_force_disable() */
1420 static int _regulator_force_disable(struct regulator_dev
*rdev
)
1425 if (rdev
->desc
->ops
->disable
) {
1426 /* ah well, who wants to live forever... */
1427 ret
= rdev
->desc
->ops
->disable(rdev
);
1429 printk(KERN_ERR
"%s: failed to force disable %s\n",
1430 __func__
, rdev_get_name(rdev
));
1433 /* notify other consumers that power has been forced off */
1434 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
1435 REGULATOR_EVENT_DISABLE
, NULL
);
1438 /* decrease our supplies ref count and disable if required */
1440 _regulator_disable(rdev
->supply
);
1442 rdev
->use_count
= 0;
1447 * regulator_force_disable - force disable regulator output
1448 * @regulator: regulator source
1450 * Forcibly disable the regulator output voltage or current.
1451 * NOTE: this *will* disable the regulator output even if other consumer
1452 * devices have it enabled. This should be used for situations when device
1453 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1455 int regulator_force_disable(struct regulator
*regulator
)
1459 mutex_lock(®ulator
->rdev
->mutex
);
1460 regulator
->uA_load
= 0;
1461 ret
= _regulator_force_disable(regulator
->rdev
);
1462 mutex_unlock(®ulator
->rdev
->mutex
);
1465 EXPORT_SYMBOL_GPL(regulator_force_disable
);
1467 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
1470 if (!rdev
->desc
->ops
->is_enabled
)
1473 return rdev
->desc
->ops
->is_enabled(rdev
);
1477 * regulator_is_enabled - is the regulator output enabled
1478 * @regulator: regulator source
1480 * Returns positive if the regulator driver backing the source/client
1481 * has requested that the device be enabled, zero if it hasn't, else a
1482 * negative errno code.
1484 * Note that the device backing this regulator handle can have multiple
1485 * users, so it might be enabled even if regulator_enable() was never
1486 * called for this particular source.
1488 int regulator_is_enabled(struct regulator
*regulator
)
1492 mutex_lock(®ulator
->rdev
->mutex
);
1493 ret
= _regulator_is_enabled(regulator
->rdev
);
1494 mutex_unlock(®ulator
->rdev
->mutex
);
1498 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
1501 * regulator_count_voltages - count regulator_list_voltage() selectors
1502 * @regulator: regulator source
1504 * Returns number of selectors, or negative errno. Selectors are
1505 * numbered starting at zero, and typically correspond to bitfields
1506 * in hardware registers.
1508 int regulator_count_voltages(struct regulator
*regulator
)
1510 struct regulator_dev
*rdev
= regulator
->rdev
;
1512 return rdev
->desc
->n_voltages
? : -EINVAL
;
1514 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
1517 * regulator_list_voltage - enumerate supported voltages
1518 * @regulator: regulator source
1519 * @selector: identify voltage to list
1520 * Context: can sleep
1522 * Returns a voltage that can be passed to @regulator_set_voltage(),
1523 * zero if this selector code can't be used on this sytem, or a
1526 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
1528 struct regulator_dev
*rdev
= regulator
->rdev
;
1529 struct regulator_ops
*ops
= rdev
->desc
->ops
;
1532 if (!ops
->list_voltage
|| selector
>= rdev
->desc
->n_voltages
)
1535 mutex_lock(&rdev
->mutex
);
1536 ret
= ops
->list_voltage(rdev
, selector
);
1537 mutex_unlock(&rdev
->mutex
);
1540 if (ret
< rdev
->constraints
->min_uV
)
1542 else if (ret
> rdev
->constraints
->max_uV
)
1548 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
1551 * regulator_is_supported_voltage - check if a voltage range can be supported
1553 * @regulator: Regulator to check.
1554 * @min_uV: Minimum required voltage in uV.
1555 * @max_uV: Maximum required voltage in uV.
1557 * Returns a boolean or a negative error code.
1559 int regulator_is_supported_voltage(struct regulator
*regulator
,
1560 int min_uV
, int max_uV
)
1562 int i
, voltages
, ret
;
1564 ret
= regulator_count_voltages(regulator
);
1569 for (i
= 0; i
< voltages
; i
++) {
1570 ret
= regulator_list_voltage(regulator
, i
);
1572 if (ret
>= min_uV
&& ret
<= max_uV
)
1580 * regulator_set_voltage - set regulator output voltage
1581 * @regulator: regulator source
1582 * @min_uV: Minimum required voltage in uV
1583 * @max_uV: Maximum acceptable voltage in uV
1585 * Sets a voltage regulator to the desired output voltage. This can be set
1586 * during any regulator state. IOW, regulator can be disabled or enabled.
1588 * If the regulator is enabled then the voltage will change to the new value
1589 * immediately otherwise if the regulator is disabled the regulator will
1590 * output at the new voltage when enabled.
1592 * NOTE: If the regulator is shared between several devices then the lowest
1593 * request voltage that meets the system constraints will be used.
1594 * Regulator system constraints must be set for this regulator before
1595 * calling this function otherwise this call will fail.
1597 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
1599 struct regulator_dev
*rdev
= regulator
->rdev
;
1602 mutex_lock(&rdev
->mutex
);
1605 if (!rdev
->desc
->ops
->set_voltage
) {
1610 /* constraints check */
1611 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
1614 regulator
->min_uV
= min_uV
;
1615 regulator
->max_uV
= max_uV
;
1616 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
);
1619 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
, NULL
);
1620 mutex_unlock(&rdev
->mutex
);
1623 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
1625 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
1628 if (rdev
->desc
->ops
->get_voltage
)
1629 return rdev
->desc
->ops
->get_voltage(rdev
);
1635 * regulator_get_voltage - get regulator output voltage
1636 * @regulator: regulator source
1638 * This returns the current regulator voltage in uV.
1640 * NOTE: If the regulator is disabled it will return the voltage value. This
1641 * function should not be used to determine regulator state.
1643 int regulator_get_voltage(struct regulator
*regulator
)
1647 mutex_lock(®ulator
->rdev
->mutex
);
1649 ret
= _regulator_get_voltage(regulator
->rdev
);
1651 mutex_unlock(®ulator
->rdev
->mutex
);
1655 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
1658 * regulator_set_current_limit - set regulator output current limit
1659 * @regulator: regulator source
1660 * @min_uA: Minimuum supported current in uA
1661 * @max_uA: Maximum supported current in uA
1663 * Sets current sink to the desired output current. This can be set during
1664 * any regulator state. IOW, regulator can be disabled or enabled.
1666 * If the regulator is enabled then the current will change to the new value
1667 * immediately otherwise if the regulator is disabled the regulator will
1668 * output at the new current when enabled.
1670 * NOTE: Regulator system constraints must be set for this regulator before
1671 * calling this function otherwise this call will fail.
1673 int regulator_set_current_limit(struct regulator
*regulator
,
1674 int min_uA
, int max_uA
)
1676 struct regulator_dev
*rdev
= regulator
->rdev
;
1679 mutex_lock(&rdev
->mutex
);
1682 if (!rdev
->desc
->ops
->set_current_limit
) {
1687 /* constraints check */
1688 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
1692 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
1694 mutex_unlock(&rdev
->mutex
);
1697 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
1699 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
1703 mutex_lock(&rdev
->mutex
);
1706 if (!rdev
->desc
->ops
->get_current_limit
) {
1711 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
1713 mutex_unlock(&rdev
->mutex
);
1718 * regulator_get_current_limit - get regulator output current
1719 * @regulator: regulator source
1721 * This returns the current supplied by the specified current sink in uA.
1723 * NOTE: If the regulator is disabled it will return the current value. This
1724 * function should not be used to determine regulator state.
1726 int regulator_get_current_limit(struct regulator
*regulator
)
1728 return _regulator_get_current_limit(regulator
->rdev
);
1730 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
1733 * regulator_set_mode - set regulator operating mode
1734 * @regulator: regulator source
1735 * @mode: operating mode - one of the REGULATOR_MODE constants
1737 * Set regulator operating mode to increase regulator efficiency or improve
1738 * regulation performance.
1740 * NOTE: Regulator system constraints must be set for this regulator before
1741 * calling this function otherwise this call will fail.
1743 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
1745 struct regulator_dev
*rdev
= regulator
->rdev
;
1748 mutex_lock(&rdev
->mutex
);
1751 if (!rdev
->desc
->ops
->set_mode
) {
1756 /* constraints check */
1757 ret
= regulator_check_mode(rdev
, mode
);
1761 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
1763 mutex_unlock(&rdev
->mutex
);
1766 EXPORT_SYMBOL_GPL(regulator_set_mode
);
1768 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
1772 mutex_lock(&rdev
->mutex
);
1775 if (!rdev
->desc
->ops
->get_mode
) {
1780 ret
= rdev
->desc
->ops
->get_mode(rdev
);
1782 mutex_unlock(&rdev
->mutex
);
1787 * regulator_get_mode - get regulator operating mode
1788 * @regulator: regulator source
1790 * Get the current regulator operating mode.
1792 unsigned int regulator_get_mode(struct regulator
*regulator
)
1794 return _regulator_get_mode(regulator
->rdev
);
1796 EXPORT_SYMBOL_GPL(regulator_get_mode
);
1799 * regulator_set_optimum_mode - set regulator optimum operating mode
1800 * @regulator: regulator source
1801 * @uA_load: load current
1803 * Notifies the regulator core of a new device load. This is then used by
1804 * DRMS (if enabled by constraints) to set the most efficient regulator
1805 * operating mode for the new regulator loading.
1807 * Consumer devices notify their supply regulator of the maximum power
1808 * they will require (can be taken from device datasheet in the power
1809 * consumption tables) when they change operational status and hence power
1810 * state. Examples of operational state changes that can affect power
1811 * consumption are :-
1813 * o Device is opened / closed.
1814 * o Device I/O is about to begin or has just finished.
1815 * o Device is idling in between work.
1817 * This information is also exported via sysfs to userspace.
1819 * DRMS will sum the total requested load on the regulator and change
1820 * to the most efficient operating mode if platform constraints allow.
1822 * Returns the new regulator mode or error.
1824 int regulator_set_optimum_mode(struct regulator
*regulator
, int uA_load
)
1826 struct regulator_dev
*rdev
= regulator
->rdev
;
1827 struct regulator
*consumer
;
1828 int ret
, output_uV
, input_uV
, total_uA_load
= 0;
1831 mutex_lock(&rdev
->mutex
);
1833 regulator
->uA_load
= uA_load
;
1834 ret
= regulator_check_drms(rdev
);
1840 if (!rdev
->desc
->ops
->get_optimum_mode
)
1843 /* get output voltage */
1844 output_uV
= rdev
->desc
->ops
->get_voltage(rdev
);
1845 if (output_uV
<= 0) {
1846 printk(KERN_ERR
"%s: invalid output voltage found for %s\n",
1847 __func__
, rdev_get_name(rdev
));
1851 /* get input voltage */
1852 if (rdev
->supply
&& rdev
->supply
->desc
->ops
->get_voltage
)
1853 input_uV
= rdev
->supply
->desc
->ops
->get_voltage(rdev
->supply
);
1855 input_uV
= rdev
->constraints
->input_uV
;
1856 if (input_uV
<= 0) {
1857 printk(KERN_ERR
"%s: invalid input voltage found for %s\n",
1858 __func__
, rdev_get_name(rdev
));
1862 /* calc total requested load for this regulator */
1863 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
)
1864 total_uA_load
+= consumer
->uA_load
;
1866 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
,
1867 input_uV
, output_uV
,
1869 ret
= regulator_check_mode(rdev
, mode
);
1871 printk(KERN_ERR
"%s: failed to get optimum mode for %s @"
1872 " %d uA %d -> %d uV\n", __func__
, rdev_get_name(rdev
),
1873 total_uA_load
, input_uV
, output_uV
);
1877 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
1879 printk(KERN_ERR
"%s: failed to set optimum mode %x for %s\n",
1880 __func__
, mode
, rdev_get_name(rdev
));
1885 mutex_unlock(&rdev
->mutex
);
1888 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode
);
1891 * regulator_register_notifier - register regulator event notifier
1892 * @regulator: regulator source
1893 * @nb: notifier block
1895 * Register notifier block to receive regulator events.
1897 int regulator_register_notifier(struct regulator
*regulator
,
1898 struct notifier_block
*nb
)
1900 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
1903 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
1906 * regulator_unregister_notifier - unregister regulator event notifier
1907 * @regulator: regulator source
1908 * @nb: notifier block
1910 * Unregister regulator event notifier block.
1912 int regulator_unregister_notifier(struct regulator
*regulator
,
1913 struct notifier_block
*nb
)
1915 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
1918 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
1920 /* notify regulator consumers and downstream regulator consumers.
1921 * Note mutex must be held by caller.
1923 static void _notifier_call_chain(struct regulator_dev
*rdev
,
1924 unsigned long event
, void *data
)
1926 struct regulator_dev
*_rdev
;
1928 /* call rdev chain first */
1929 blocking_notifier_call_chain(&rdev
->notifier
, event
, NULL
);
1931 /* now notify regulator we supply */
1932 list_for_each_entry(_rdev
, &rdev
->supply_list
, slist
) {
1933 mutex_lock(&_rdev
->mutex
);
1934 _notifier_call_chain(_rdev
, event
, data
);
1935 mutex_unlock(&_rdev
->mutex
);
1940 * regulator_bulk_get - get multiple regulator consumers
1942 * @dev: Device to supply
1943 * @num_consumers: Number of consumers to register
1944 * @consumers: Configuration of consumers; clients are stored here.
1946 * @return 0 on success, an errno on failure.
1948 * This helper function allows drivers to get several regulator
1949 * consumers in one operation. If any of the regulators cannot be
1950 * acquired then any regulators that were allocated will be freed
1951 * before returning to the caller.
1953 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
1954 struct regulator_bulk_data
*consumers
)
1959 for (i
= 0; i
< num_consumers
; i
++)
1960 consumers
[i
].consumer
= NULL
;
1962 for (i
= 0; i
< num_consumers
; i
++) {
1963 consumers
[i
].consumer
= regulator_get(dev
,
1964 consumers
[i
].supply
);
1965 if (IS_ERR(consumers
[i
].consumer
)) {
1966 ret
= PTR_ERR(consumers
[i
].consumer
);
1967 dev_err(dev
, "Failed to get supply '%s': %d\n",
1968 consumers
[i
].supply
, ret
);
1969 consumers
[i
].consumer
= NULL
;
1977 for (i
= 0; i
< num_consumers
&& consumers
[i
].consumer
; i
++)
1978 regulator_put(consumers
[i
].consumer
);
1982 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
1985 * regulator_bulk_enable - enable multiple regulator consumers
1987 * @num_consumers: Number of consumers
1988 * @consumers: Consumer data; clients are stored here.
1989 * @return 0 on success, an errno on failure
1991 * This convenience API allows consumers to enable multiple regulator
1992 * clients in a single API call. If any consumers cannot be enabled
1993 * then any others that were enabled will be disabled again prior to
1996 int regulator_bulk_enable(int num_consumers
,
1997 struct regulator_bulk_data
*consumers
)
2002 for (i
= 0; i
< num_consumers
; i
++) {
2003 ret
= regulator_enable(consumers
[i
].consumer
);
2011 printk(KERN_ERR
"Failed to enable %s: %d\n", consumers
[i
].supply
, ret
);
2012 for (--i
; i
>= 0; --i
)
2013 regulator_disable(consumers
[i
].consumer
);
2017 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
2020 * regulator_bulk_disable - disable multiple regulator consumers
2022 * @num_consumers: Number of consumers
2023 * @consumers: Consumer data; clients are stored here.
2024 * @return 0 on success, an errno on failure
2026 * This convenience API allows consumers to disable multiple regulator
2027 * clients in a single API call. If any consumers cannot be enabled
2028 * then any others that were disabled will be disabled again prior to
2031 int regulator_bulk_disable(int num_consumers
,
2032 struct regulator_bulk_data
*consumers
)
2037 for (i
= 0; i
< num_consumers
; i
++) {
2038 ret
= regulator_disable(consumers
[i
].consumer
);
2046 printk(KERN_ERR
"Failed to disable %s: %d\n", consumers
[i
].supply
,
2048 for (--i
; i
>= 0; --i
)
2049 regulator_enable(consumers
[i
].consumer
);
2053 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
2056 * regulator_bulk_free - free multiple regulator consumers
2058 * @num_consumers: Number of consumers
2059 * @consumers: Consumer data; clients are stored here.
2061 * This convenience API allows consumers to free multiple regulator
2062 * clients in a single API call.
2064 void regulator_bulk_free(int num_consumers
,
2065 struct regulator_bulk_data
*consumers
)
2069 for (i
= 0; i
< num_consumers
; i
++) {
2070 regulator_put(consumers
[i
].consumer
);
2071 consumers
[i
].consumer
= NULL
;
2074 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
2077 * regulator_notifier_call_chain - call regulator event notifier
2078 * @rdev: regulator source
2079 * @event: notifier block
2080 * @data: callback-specific data.
2082 * Called by regulator drivers to notify clients a regulator event has
2083 * occurred. We also notify regulator clients downstream.
2084 * Note lock must be held by caller.
2086 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
2087 unsigned long event
, void *data
)
2089 _notifier_call_chain(rdev
, event
, data
);
2093 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
2096 * regulator_mode_to_status - convert a regulator mode into a status
2098 * @mode: Mode to convert
2100 * Convert a regulator mode into a status.
2102 int regulator_mode_to_status(unsigned int mode
)
2105 case REGULATOR_MODE_FAST
:
2106 return REGULATOR_STATUS_FAST
;
2107 case REGULATOR_MODE_NORMAL
:
2108 return REGULATOR_STATUS_NORMAL
;
2109 case REGULATOR_MODE_IDLE
:
2110 return REGULATOR_STATUS_IDLE
;
2111 case REGULATOR_STATUS_STANDBY
:
2112 return REGULATOR_STATUS_STANDBY
;
2117 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
2120 * To avoid cluttering sysfs (and memory) with useless state, only
2121 * create attributes that can be meaningfully displayed.
2123 static int add_regulator_attributes(struct regulator_dev
*rdev
)
2125 struct device
*dev
= &rdev
->dev
;
2126 struct regulator_ops
*ops
= rdev
->desc
->ops
;
2129 /* some attributes need specific methods to be displayed */
2130 if (ops
->get_voltage
) {
2131 status
= device_create_file(dev
, &dev_attr_microvolts
);
2135 if (ops
->get_current_limit
) {
2136 status
= device_create_file(dev
, &dev_attr_microamps
);
2140 if (ops
->get_mode
) {
2141 status
= device_create_file(dev
, &dev_attr_opmode
);
2145 if (ops
->is_enabled
) {
2146 status
= device_create_file(dev
, &dev_attr_state
);
2150 if (ops
->get_status
) {
2151 status
= device_create_file(dev
, &dev_attr_status
);
2156 /* some attributes are type-specific */
2157 if (rdev
->desc
->type
== REGULATOR_CURRENT
) {
2158 status
= device_create_file(dev
, &dev_attr_requested_microamps
);
2163 /* all the other attributes exist to support constraints;
2164 * don't show them if there are no constraints, or if the
2165 * relevant supporting methods are missing.
2167 if (!rdev
->constraints
)
2170 /* constraints need specific supporting methods */
2171 if (ops
->set_voltage
) {
2172 status
= device_create_file(dev
, &dev_attr_min_microvolts
);
2175 status
= device_create_file(dev
, &dev_attr_max_microvolts
);
2179 if (ops
->set_current_limit
) {
2180 status
= device_create_file(dev
, &dev_attr_min_microamps
);
2183 status
= device_create_file(dev
, &dev_attr_max_microamps
);
2188 /* suspend mode constraints need multiple supporting methods */
2189 if (!(ops
->set_suspend_enable
&& ops
->set_suspend_disable
))
2192 status
= device_create_file(dev
, &dev_attr_suspend_standby_state
);
2195 status
= device_create_file(dev
, &dev_attr_suspend_mem_state
);
2198 status
= device_create_file(dev
, &dev_attr_suspend_disk_state
);
2202 if (ops
->set_suspend_voltage
) {
2203 status
= device_create_file(dev
,
2204 &dev_attr_suspend_standby_microvolts
);
2207 status
= device_create_file(dev
,
2208 &dev_attr_suspend_mem_microvolts
);
2211 status
= device_create_file(dev
,
2212 &dev_attr_suspend_disk_microvolts
);
2217 if (ops
->set_suspend_mode
) {
2218 status
= device_create_file(dev
,
2219 &dev_attr_suspend_standby_mode
);
2222 status
= device_create_file(dev
,
2223 &dev_attr_suspend_mem_mode
);
2226 status
= device_create_file(dev
,
2227 &dev_attr_suspend_disk_mode
);
2236 * regulator_register - register regulator
2237 * @regulator_desc: regulator to register
2238 * @dev: struct device for the regulator
2239 * @init_data: platform provided init data, passed through by driver
2240 * @driver_data: private regulator data
2242 * Called by regulator drivers to register a regulator.
2243 * Returns 0 on success.
2245 struct regulator_dev
*regulator_register(struct regulator_desc
*regulator_desc
,
2246 struct device
*dev
, struct regulator_init_data
*init_data
,
2249 static atomic_t regulator_no
= ATOMIC_INIT(0);
2250 struct regulator_dev
*rdev
;
2253 if (regulator_desc
== NULL
)
2254 return ERR_PTR(-EINVAL
);
2256 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
2257 return ERR_PTR(-EINVAL
);
2259 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
2260 regulator_desc
->type
!= REGULATOR_CURRENT
)
2261 return ERR_PTR(-EINVAL
);
2264 return ERR_PTR(-EINVAL
);
2266 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
2268 return ERR_PTR(-ENOMEM
);
2270 mutex_lock(®ulator_list_mutex
);
2272 mutex_init(&rdev
->mutex
);
2273 rdev
->reg_data
= driver_data
;
2274 rdev
->owner
= regulator_desc
->owner
;
2275 rdev
->desc
= regulator_desc
;
2276 INIT_LIST_HEAD(&rdev
->consumer_list
);
2277 INIT_LIST_HEAD(&rdev
->supply_list
);
2278 INIT_LIST_HEAD(&rdev
->list
);
2279 INIT_LIST_HEAD(&rdev
->slist
);
2280 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
2282 /* preform any regulator specific init */
2283 if (init_data
->regulator_init
) {
2284 ret
= init_data
->regulator_init(rdev
->reg_data
);
2289 /* register with sysfs */
2290 rdev
->dev
.class = ®ulator_class
;
2291 rdev
->dev
.parent
= dev
;
2292 dev_set_name(&rdev
->dev
, "regulator.%d",
2293 atomic_inc_return(®ulator_no
) - 1);
2294 ret
= device_register(&rdev
->dev
);
2298 dev_set_drvdata(&rdev
->dev
, rdev
);
2300 /* set regulator constraints */
2301 ret
= set_machine_constraints(rdev
, &init_data
->constraints
);
2305 /* add attributes supported by this regulator */
2306 ret
= add_regulator_attributes(rdev
);
2310 /* set supply regulator if it exists */
2311 if (init_data
->supply_regulator_dev
) {
2312 ret
= set_supply(rdev
,
2313 dev_get_drvdata(init_data
->supply_regulator_dev
));
2318 /* add consumers devices */
2319 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
2320 ret
= set_consumer_device_supply(rdev
,
2321 init_data
->consumer_supplies
[i
].dev
,
2322 init_data
->consumer_supplies
[i
].dev_name
,
2323 init_data
->consumer_supplies
[i
].supply
);
2325 for (--i
; i
>= 0; i
--)
2326 unset_consumer_device_supply(rdev
,
2327 init_data
->consumer_supplies
[i
].dev_name
,
2328 init_data
->consumer_supplies
[i
].dev
);
2333 list_add(&rdev
->list
, ®ulator_list
);
2335 mutex_unlock(®ulator_list_mutex
);
2339 device_unregister(&rdev
->dev
);
2340 /* device core frees rdev */
2341 rdev
= ERR_PTR(ret
);
2346 rdev
= ERR_PTR(ret
);
2349 EXPORT_SYMBOL_GPL(regulator_register
);
2352 * regulator_unregister - unregister regulator
2353 * @rdev: regulator to unregister
2355 * Called by regulator drivers to unregister a regulator.
2357 void regulator_unregister(struct regulator_dev
*rdev
)
2362 mutex_lock(®ulator_list_mutex
);
2363 WARN_ON(rdev
->open_count
);
2364 unset_regulator_supplies(rdev
);
2365 list_del(&rdev
->list
);
2367 sysfs_remove_link(&rdev
->dev
.kobj
, "supply");
2368 device_unregister(&rdev
->dev
);
2369 mutex_unlock(®ulator_list_mutex
);
2371 EXPORT_SYMBOL_GPL(regulator_unregister
);
2374 * regulator_suspend_prepare - prepare regulators for system wide suspend
2375 * @state: system suspend state
2377 * Configure each regulator with it's suspend operating parameters for state.
2378 * This will usually be called by machine suspend code prior to supending.
2380 int regulator_suspend_prepare(suspend_state_t state
)
2382 struct regulator_dev
*rdev
;
2385 /* ON is handled by regulator active state */
2386 if (state
== PM_SUSPEND_ON
)
2389 mutex_lock(®ulator_list_mutex
);
2390 list_for_each_entry(rdev
, ®ulator_list
, list
) {
2392 mutex_lock(&rdev
->mutex
);
2393 ret
= suspend_prepare(rdev
, state
);
2394 mutex_unlock(&rdev
->mutex
);
2397 printk(KERN_ERR
"%s: failed to prepare %s\n",
2398 __func__
, rdev_get_name(rdev
));
2403 mutex_unlock(®ulator_list_mutex
);
2406 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
2409 * regulator_has_full_constraints - the system has fully specified constraints
2411 * Calling this function will cause the regulator API to disable all
2412 * regulators which have a zero use count and don't have an always_on
2413 * constraint in a late_initcall.
2415 * The intention is that this will become the default behaviour in a
2416 * future kernel release so users are encouraged to use this facility
2419 void regulator_has_full_constraints(void)
2421 has_full_constraints
= 1;
2423 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
2426 * rdev_get_drvdata - get rdev regulator driver data
2429 * Get rdev regulator driver private data. This call can be used in the
2430 * regulator driver context.
2432 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
2434 return rdev
->reg_data
;
2436 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
2439 * regulator_get_drvdata - get regulator driver data
2440 * @regulator: regulator
2442 * Get regulator driver private data. This call can be used in the consumer
2443 * driver context when non API regulator specific functions need to be called.
2445 void *regulator_get_drvdata(struct regulator
*regulator
)
2447 return regulator
->rdev
->reg_data
;
2449 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
2452 * regulator_set_drvdata - set regulator driver data
2453 * @regulator: regulator
2456 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
2458 regulator
->rdev
->reg_data
= data
;
2460 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
2463 * regulator_get_id - get regulator ID
2466 int rdev_get_id(struct regulator_dev
*rdev
)
2468 return rdev
->desc
->id
;
2470 EXPORT_SYMBOL_GPL(rdev_get_id
);
2472 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
2476 EXPORT_SYMBOL_GPL(rdev_get_dev
);
2478 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
2480 return reg_init_data
->driver_data
;
2482 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
2484 static int __init
regulator_init(void)
2486 printk(KERN_INFO
"regulator: core version %s\n", REGULATOR_VERSION
);
2487 return class_register(®ulator_class
);
2490 /* init early to allow our consumers to complete system booting */
2491 core_initcall(regulator_init
);
2493 static int __init
regulator_init_complete(void)
2495 struct regulator_dev
*rdev
;
2496 struct regulator_ops
*ops
;
2497 struct regulation_constraints
*c
;
2501 mutex_lock(®ulator_list_mutex
);
2503 /* If we have a full configuration then disable any regulators
2504 * which are not in use or always_on. This will become the
2505 * default behaviour in the future.
2507 list_for_each_entry(rdev
, ®ulator_list
, list
) {
2508 ops
= rdev
->desc
->ops
;
2509 c
= rdev
->constraints
;
2511 name
= rdev_get_name(rdev
);
2513 if (!ops
->disable
|| (c
&& c
->always_on
))
2516 mutex_lock(&rdev
->mutex
);
2518 if (rdev
->use_count
)
2521 /* If we can't read the status assume it's on. */
2522 if (ops
->is_enabled
)
2523 enabled
= ops
->is_enabled(rdev
);
2530 if (has_full_constraints
) {
2531 /* We log since this may kill the system if it
2533 printk(KERN_INFO
"%s: disabling %s\n",
2535 ret
= ops
->disable(rdev
);
2538 "%s: couldn't disable %s: %d\n",
2539 __func__
, name
, ret
);
2542 /* The intention is that in future we will
2543 * assume that full constraints are provided
2544 * so warn even if we aren't going to do
2548 "%s: incomplete constraints, leaving %s on\n",
2553 mutex_unlock(&rdev
->mutex
);
2556 mutex_unlock(®ulator_list_mutex
);
2560 late_initcall(regulator_init_complete
);