2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
27 #include <linux/gpio/consumer.h>
29 #include <linux/regmap.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/module.h>
36 #define CREATE_TRACE_POINTS
37 #include <trace/events/regulator.h>
42 #define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 #define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
53 static DEFINE_MUTEX(regulator_list_mutex
);
54 static LIST_HEAD(regulator_map_list
);
55 static LIST_HEAD(regulator_ena_gpio_list
);
56 static LIST_HEAD(regulator_supply_alias_list
);
57 static bool has_full_constraints
;
59 static struct dentry
*debugfs_root
;
61 static struct class regulator_class
;
64 * struct regulator_map
66 * Used to provide symbolic supply names to devices.
68 struct regulator_map
{
69 struct list_head list
;
70 const char *dev_name
; /* The dev_name() for the consumer */
72 struct regulator_dev
*regulator
;
76 * struct regulator_enable_gpio
78 * Management for shared enable GPIO pin
80 struct regulator_enable_gpio
{
81 struct list_head list
;
82 struct gpio_desc
*gpiod
;
83 u32 enable_count
; /* a number of enabled shared GPIO */
84 u32 request_count
; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert
:1;
89 * struct regulator_supply_alias
91 * Used to map lookups for a supply onto an alternative device.
93 struct regulator_supply_alias
{
94 struct list_head list
;
95 struct device
*src_dev
;
96 const char *src_supply
;
97 struct device
*alias_dev
;
98 const char *alias_supply
;
101 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
102 static int _regulator_disable(struct regulator_dev
*rdev
);
103 static int _regulator_get_voltage(struct regulator_dev
*rdev
);
104 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
105 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
106 static int _notifier_call_chain(struct regulator_dev
*rdev
,
107 unsigned long event
, void *data
);
108 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
109 int min_uV
, int max_uV
);
110 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
112 const char *supply_name
);
113 static void _regulator_put(struct regulator
*regulator
);
115 static struct regulator_dev
*dev_to_rdev(struct device
*dev
)
117 return container_of(dev
, struct regulator_dev
, dev
);
120 static const char *rdev_get_name(struct regulator_dev
*rdev
)
122 if (rdev
->constraints
&& rdev
->constraints
->name
)
123 return rdev
->constraints
->name
;
124 else if (rdev
->desc
->name
)
125 return rdev
->desc
->name
;
130 static bool have_full_constraints(void)
132 return has_full_constraints
|| of_have_populated_dt();
135 static bool regulator_ops_is_valid(struct regulator_dev
*rdev
, int ops
)
137 if (!rdev
->constraints
) {
138 rdev_err(rdev
, "no constraints\n");
142 if (rdev
->constraints
->valid_ops_mask
& ops
)
148 static inline struct regulator_dev
*rdev_get_supply(struct regulator_dev
*rdev
)
150 if (rdev
&& rdev
->supply
)
151 return rdev
->supply
->rdev
;
157 * regulator_lock_supply - lock a regulator and its supplies
158 * @rdev: regulator source
160 static void regulator_lock_supply(struct regulator_dev
*rdev
)
164 for (i
= 0; rdev
; rdev
= rdev_get_supply(rdev
), i
++)
165 mutex_lock_nested(&rdev
->mutex
, i
);
169 * regulator_unlock_supply - unlock a regulator and its supplies
170 * @rdev: regulator source
172 static void regulator_unlock_supply(struct regulator_dev
*rdev
)
174 struct regulator
*supply
;
177 mutex_unlock(&rdev
->mutex
);
178 supply
= rdev
->supply
;
188 * of_get_regulator - get a regulator device node based on supply name
189 * @dev: Device pointer for the consumer (of regulator) device
190 * @supply: regulator supply name
192 * Extract the regulator device node corresponding to the supply name.
193 * returns the device node corresponding to the regulator if found, else
196 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
198 struct device_node
*regnode
= NULL
;
199 char prop_name
[32]; /* 32 is max size of property name */
201 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
203 snprintf(prop_name
, 32, "%s-supply", supply
);
204 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
207 dev_dbg(dev
, "Looking up %s property in node %s failed\n",
208 prop_name
, dev
->of_node
->full_name
);
214 /* Platform voltage constraint check */
215 static int regulator_check_voltage(struct regulator_dev
*rdev
,
216 int *min_uV
, int *max_uV
)
218 BUG_ON(*min_uV
> *max_uV
);
220 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
221 rdev_err(rdev
, "voltage operation not allowed\n");
225 if (*max_uV
> rdev
->constraints
->max_uV
)
226 *max_uV
= rdev
->constraints
->max_uV
;
227 if (*min_uV
< rdev
->constraints
->min_uV
)
228 *min_uV
= rdev
->constraints
->min_uV
;
230 if (*min_uV
> *max_uV
) {
231 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
239 /* Make sure we select a voltage that suits the needs of all
240 * regulator consumers
242 static int regulator_check_consumers(struct regulator_dev
*rdev
,
243 int *min_uV
, int *max_uV
)
245 struct regulator
*regulator
;
247 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
249 * Assume consumers that didn't say anything are OK
250 * with anything in the constraint range.
252 if (!regulator
->min_uV
&& !regulator
->max_uV
)
255 if (*max_uV
> regulator
->max_uV
)
256 *max_uV
= regulator
->max_uV
;
257 if (*min_uV
< regulator
->min_uV
)
258 *min_uV
= regulator
->min_uV
;
261 if (*min_uV
> *max_uV
) {
262 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
270 /* current constraint check */
271 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
272 int *min_uA
, int *max_uA
)
274 BUG_ON(*min_uA
> *max_uA
);
276 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_CURRENT
)) {
277 rdev_err(rdev
, "current operation not allowed\n");
281 if (*max_uA
> rdev
->constraints
->max_uA
)
282 *max_uA
= rdev
->constraints
->max_uA
;
283 if (*min_uA
< rdev
->constraints
->min_uA
)
284 *min_uA
= rdev
->constraints
->min_uA
;
286 if (*min_uA
> *max_uA
) {
287 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
295 /* operating mode constraint check */
296 static int regulator_mode_constrain(struct regulator_dev
*rdev
,
300 case REGULATOR_MODE_FAST
:
301 case REGULATOR_MODE_NORMAL
:
302 case REGULATOR_MODE_IDLE
:
303 case REGULATOR_MODE_STANDBY
:
306 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
310 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_MODE
)) {
311 rdev_err(rdev
, "mode operation not allowed\n");
315 /* The modes are bitmasks, the most power hungry modes having
316 * the lowest values. If the requested mode isn't supported
317 * try higher modes. */
319 if (rdev
->constraints
->valid_modes_mask
& *mode
)
327 static ssize_t
regulator_uV_show(struct device
*dev
,
328 struct device_attribute
*attr
, char *buf
)
330 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
333 mutex_lock(&rdev
->mutex
);
334 ret
= sprintf(buf
, "%d\n", _regulator_get_voltage(rdev
));
335 mutex_unlock(&rdev
->mutex
);
339 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
341 static ssize_t
regulator_uA_show(struct device
*dev
,
342 struct device_attribute
*attr
, char *buf
)
344 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
346 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
348 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
350 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
353 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
355 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
357 static DEVICE_ATTR_RO(name
);
359 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
362 case REGULATOR_MODE_FAST
:
363 return sprintf(buf
, "fast\n");
364 case REGULATOR_MODE_NORMAL
:
365 return sprintf(buf
, "normal\n");
366 case REGULATOR_MODE_IDLE
:
367 return sprintf(buf
, "idle\n");
368 case REGULATOR_MODE_STANDBY
:
369 return sprintf(buf
, "standby\n");
371 return sprintf(buf
, "unknown\n");
374 static ssize_t
regulator_opmode_show(struct device
*dev
,
375 struct device_attribute
*attr
, char *buf
)
377 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
379 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
381 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
383 static ssize_t
regulator_print_state(char *buf
, int state
)
386 return sprintf(buf
, "enabled\n");
388 return sprintf(buf
, "disabled\n");
390 return sprintf(buf
, "unknown\n");
393 static ssize_t
regulator_state_show(struct device
*dev
,
394 struct device_attribute
*attr
, char *buf
)
396 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
399 mutex_lock(&rdev
->mutex
);
400 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
401 mutex_unlock(&rdev
->mutex
);
405 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
407 static ssize_t
regulator_status_show(struct device
*dev
,
408 struct device_attribute
*attr
, char *buf
)
410 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
414 status
= rdev
->desc
->ops
->get_status(rdev
);
419 case REGULATOR_STATUS_OFF
:
422 case REGULATOR_STATUS_ON
:
425 case REGULATOR_STATUS_ERROR
:
428 case REGULATOR_STATUS_FAST
:
431 case REGULATOR_STATUS_NORMAL
:
434 case REGULATOR_STATUS_IDLE
:
437 case REGULATOR_STATUS_STANDBY
:
440 case REGULATOR_STATUS_BYPASS
:
443 case REGULATOR_STATUS_UNDEFINED
:
450 return sprintf(buf
, "%s\n", label
);
452 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
454 static ssize_t
regulator_min_uA_show(struct device
*dev
,
455 struct device_attribute
*attr
, char *buf
)
457 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
459 if (!rdev
->constraints
)
460 return sprintf(buf
, "constraint not defined\n");
462 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
464 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
466 static ssize_t
regulator_max_uA_show(struct device
*dev
,
467 struct device_attribute
*attr
, char *buf
)
469 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
471 if (!rdev
->constraints
)
472 return sprintf(buf
, "constraint not defined\n");
474 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
476 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
478 static ssize_t
regulator_min_uV_show(struct device
*dev
,
479 struct device_attribute
*attr
, char *buf
)
481 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
483 if (!rdev
->constraints
)
484 return sprintf(buf
, "constraint not defined\n");
486 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
488 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
490 static ssize_t
regulator_max_uV_show(struct device
*dev
,
491 struct device_attribute
*attr
, char *buf
)
493 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
495 if (!rdev
->constraints
)
496 return sprintf(buf
, "constraint not defined\n");
498 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
500 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
502 static ssize_t
regulator_total_uA_show(struct device
*dev
,
503 struct device_attribute
*attr
, char *buf
)
505 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
506 struct regulator
*regulator
;
509 mutex_lock(&rdev
->mutex
);
510 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
)
511 uA
+= regulator
->uA_load
;
512 mutex_unlock(&rdev
->mutex
);
513 return sprintf(buf
, "%d\n", uA
);
515 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
517 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
520 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
521 return sprintf(buf
, "%d\n", rdev
->use_count
);
523 static DEVICE_ATTR_RO(num_users
);
525 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
528 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
530 switch (rdev
->desc
->type
) {
531 case REGULATOR_VOLTAGE
:
532 return sprintf(buf
, "voltage\n");
533 case REGULATOR_CURRENT
:
534 return sprintf(buf
, "current\n");
536 return sprintf(buf
, "unknown\n");
538 static DEVICE_ATTR_RO(type
);
540 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
541 struct device_attribute
*attr
, char *buf
)
543 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
545 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
547 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
548 regulator_suspend_mem_uV_show
, NULL
);
550 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
551 struct device_attribute
*attr
, char *buf
)
553 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
555 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
557 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
558 regulator_suspend_disk_uV_show
, NULL
);
560 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
561 struct device_attribute
*attr
, char *buf
)
563 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
565 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
567 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
568 regulator_suspend_standby_uV_show
, NULL
);
570 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
571 struct device_attribute
*attr
, char *buf
)
573 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
575 return regulator_print_opmode(buf
,
576 rdev
->constraints
->state_mem
.mode
);
578 static DEVICE_ATTR(suspend_mem_mode
, 0444,
579 regulator_suspend_mem_mode_show
, NULL
);
581 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
582 struct device_attribute
*attr
, char *buf
)
584 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
586 return regulator_print_opmode(buf
,
587 rdev
->constraints
->state_disk
.mode
);
589 static DEVICE_ATTR(suspend_disk_mode
, 0444,
590 regulator_suspend_disk_mode_show
, NULL
);
592 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
593 struct device_attribute
*attr
, char *buf
)
595 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
597 return regulator_print_opmode(buf
,
598 rdev
->constraints
->state_standby
.mode
);
600 static DEVICE_ATTR(suspend_standby_mode
, 0444,
601 regulator_suspend_standby_mode_show
, NULL
);
603 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
604 struct device_attribute
*attr
, char *buf
)
606 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
608 return regulator_print_state(buf
,
609 rdev
->constraints
->state_mem
.enabled
);
611 static DEVICE_ATTR(suspend_mem_state
, 0444,
612 regulator_suspend_mem_state_show
, NULL
);
614 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
615 struct device_attribute
*attr
, char *buf
)
617 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
619 return regulator_print_state(buf
,
620 rdev
->constraints
->state_disk
.enabled
);
622 static DEVICE_ATTR(suspend_disk_state
, 0444,
623 regulator_suspend_disk_state_show
, NULL
);
625 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
626 struct device_attribute
*attr
, char *buf
)
628 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
630 return regulator_print_state(buf
,
631 rdev
->constraints
->state_standby
.enabled
);
633 static DEVICE_ATTR(suspend_standby_state
, 0444,
634 regulator_suspend_standby_state_show
, NULL
);
636 static ssize_t
regulator_bypass_show(struct device
*dev
,
637 struct device_attribute
*attr
, char *buf
)
639 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
644 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
653 return sprintf(buf
, "%s\n", report
);
655 static DEVICE_ATTR(bypass
, 0444,
656 regulator_bypass_show
, NULL
);
658 /* Calculate the new optimum regulator operating mode based on the new total
659 * consumer load. All locks held by caller */
660 static int drms_uA_update(struct regulator_dev
*rdev
)
662 struct regulator
*sibling
;
663 int current_uA
= 0, output_uV
, input_uV
, err
;
666 lockdep_assert_held_once(&rdev
->mutex
);
669 * first check to see if we can set modes at all, otherwise just
670 * tell the consumer everything is OK.
672 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_DRMS
))
675 if (!rdev
->desc
->ops
->get_optimum_mode
&&
676 !rdev
->desc
->ops
->set_load
)
679 if (!rdev
->desc
->ops
->set_mode
&&
680 !rdev
->desc
->ops
->set_load
)
683 /* calc total requested load */
684 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
)
685 current_uA
+= sibling
->uA_load
;
687 current_uA
+= rdev
->constraints
->system_load
;
689 if (rdev
->desc
->ops
->set_load
) {
690 /* set the optimum mode for our new total regulator load */
691 err
= rdev
->desc
->ops
->set_load(rdev
, current_uA
);
693 rdev_err(rdev
, "failed to set load %d\n", current_uA
);
695 /* get output voltage */
696 output_uV
= _regulator_get_voltage(rdev
);
697 if (output_uV
<= 0) {
698 rdev_err(rdev
, "invalid output voltage found\n");
702 /* get input voltage */
705 input_uV
= regulator_get_voltage(rdev
->supply
);
707 input_uV
= rdev
->constraints
->input_uV
;
709 rdev_err(rdev
, "invalid input voltage found\n");
713 /* now get the optimum mode for our new total regulator load */
714 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
715 output_uV
, current_uA
);
717 /* check the new mode is allowed */
718 err
= regulator_mode_constrain(rdev
, &mode
);
720 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV\n",
721 current_uA
, input_uV
, output_uV
);
725 err
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
727 rdev_err(rdev
, "failed to set optimum mode %x\n", mode
);
733 static int suspend_set_state(struct regulator_dev
*rdev
,
734 struct regulator_state
*rstate
)
738 /* If we have no suspend mode configration don't set anything;
739 * only warn if the driver implements set_suspend_voltage or
740 * set_suspend_mode callback.
742 if (!rstate
->enabled
&& !rstate
->disabled
) {
743 if (rdev
->desc
->ops
->set_suspend_voltage
||
744 rdev
->desc
->ops
->set_suspend_mode
)
745 rdev_warn(rdev
, "No configuration\n");
749 if (rstate
->enabled
&& rstate
->disabled
) {
750 rdev_err(rdev
, "invalid configuration\n");
754 if (rstate
->enabled
&& rdev
->desc
->ops
->set_suspend_enable
)
755 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
756 else if (rstate
->disabled
&& rdev
->desc
->ops
->set_suspend_disable
)
757 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
758 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
762 rdev_err(rdev
, "failed to enabled/disable\n");
766 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
767 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
769 rdev_err(rdev
, "failed to set voltage\n");
774 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
775 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
777 rdev_err(rdev
, "failed to set mode\n");
784 /* locks held by caller */
785 static int suspend_prepare(struct regulator_dev
*rdev
, suspend_state_t state
)
787 if (!rdev
->constraints
)
791 case PM_SUSPEND_STANDBY
:
792 return suspend_set_state(rdev
,
793 &rdev
->constraints
->state_standby
);
795 return suspend_set_state(rdev
,
796 &rdev
->constraints
->state_mem
);
798 return suspend_set_state(rdev
,
799 &rdev
->constraints
->state_disk
);
805 static void print_constraints(struct regulator_dev
*rdev
)
807 struct regulation_constraints
*constraints
= rdev
->constraints
;
809 size_t len
= sizeof(buf
) - 1;
813 if (constraints
->min_uV
&& constraints
->max_uV
) {
814 if (constraints
->min_uV
== constraints
->max_uV
)
815 count
+= scnprintf(buf
+ count
, len
- count
, "%d mV ",
816 constraints
->min_uV
/ 1000);
818 count
+= scnprintf(buf
+ count
, len
- count
,
820 constraints
->min_uV
/ 1000,
821 constraints
->max_uV
/ 1000);
824 if (!constraints
->min_uV
||
825 constraints
->min_uV
!= constraints
->max_uV
) {
826 ret
= _regulator_get_voltage(rdev
);
828 count
+= scnprintf(buf
+ count
, len
- count
,
829 "at %d mV ", ret
/ 1000);
832 if (constraints
->uV_offset
)
833 count
+= scnprintf(buf
+ count
, len
- count
, "%dmV offset ",
834 constraints
->uV_offset
/ 1000);
836 if (constraints
->min_uA
&& constraints
->max_uA
) {
837 if (constraints
->min_uA
== constraints
->max_uA
)
838 count
+= scnprintf(buf
+ count
, len
- count
, "%d mA ",
839 constraints
->min_uA
/ 1000);
841 count
+= scnprintf(buf
+ count
, len
- count
,
843 constraints
->min_uA
/ 1000,
844 constraints
->max_uA
/ 1000);
847 if (!constraints
->min_uA
||
848 constraints
->min_uA
!= constraints
->max_uA
) {
849 ret
= _regulator_get_current_limit(rdev
);
851 count
+= scnprintf(buf
+ count
, len
- count
,
852 "at %d mA ", ret
/ 1000);
855 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
856 count
+= scnprintf(buf
+ count
, len
- count
, "fast ");
857 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
858 count
+= scnprintf(buf
+ count
, len
- count
, "normal ");
859 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
860 count
+= scnprintf(buf
+ count
, len
- count
, "idle ");
861 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
862 count
+= scnprintf(buf
+ count
, len
- count
, "standby");
865 scnprintf(buf
, len
, "no parameters");
867 rdev_dbg(rdev
, "%s\n", buf
);
869 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
870 !regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
))
872 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
875 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
876 struct regulation_constraints
*constraints
)
878 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
881 /* do we need to apply the constraint voltage */
882 if (rdev
->constraints
->apply_uV
&&
883 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
) {
884 int target_min
, target_max
;
885 int current_uV
= _regulator_get_voltage(rdev
);
886 if (current_uV
< 0) {
888 "failed to get the current voltage(%d)\n",
894 * If we're below the minimum voltage move up to the
895 * minimum voltage, if we're above the maximum voltage
896 * then move down to the maximum.
898 target_min
= current_uV
;
899 target_max
= current_uV
;
901 if (current_uV
< rdev
->constraints
->min_uV
) {
902 target_min
= rdev
->constraints
->min_uV
;
903 target_max
= rdev
->constraints
->min_uV
;
906 if (current_uV
> rdev
->constraints
->max_uV
) {
907 target_min
= rdev
->constraints
->max_uV
;
908 target_max
= rdev
->constraints
->max_uV
;
911 if (target_min
!= current_uV
|| target_max
!= current_uV
) {
912 rdev_info(rdev
, "Bringing %duV into %d-%duV\n",
913 current_uV
, target_min
, target_max
);
914 ret
= _regulator_do_set_voltage(
915 rdev
, target_min
, target_max
);
918 "failed to apply %d-%duV constraint(%d)\n",
919 target_min
, target_max
, ret
);
925 /* constrain machine-level voltage specs to fit
926 * the actual range supported by this regulator.
928 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
929 int count
= rdev
->desc
->n_voltages
;
931 int min_uV
= INT_MAX
;
932 int max_uV
= INT_MIN
;
933 int cmin
= constraints
->min_uV
;
934 int cmax
= constraints
->max_uV
;
936 /* it's safe to autoconfigure fixed-voltage supplies
937 and the constraints are used by list_voltage. */
938 if (count
== 1 && !cmin
) {
941 constraints
->min_uV
= cmin
;
942 constraints
->max_uV
= cmax
;
945 /* voltage constraints are optional */
946 if ((cmin
== 0) && (cmax
== 0))
949 /* else require explicit machine-level constraints */
950 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
951 rdev_err(rdev
, "invalid voltage constraints\n");
955 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
956 for (i
= 0; i
< count
; i
++) {
959 value
= ops
->list_voltage(rdev
, i
);
963 /* maybe adjust [min_uV..max_uV] */
964 if (value
>= cmin
&& value
< min_uV
)
966 if (value
<= cmax
&& value
> max_uV
)
970 /* final: [min_uV..max_uV] valid iff constraints valid */
971 if (max_uV
< min_uV
) {
973 "unsupportable voltage constraints %u-%uuV\n",
978 /* use regulator's subset of machine constraints */
979 if (constraints
->min_uV
< min_uV
) {
980 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
981 constraints
->min_uV
, min_uV
);
982 constraints
->min_uV
= min_uV
;
984 if (constraints
->max_uV
> max_uV
) {
985 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
986 constraints
->max_uV
, max_uV
);
987 constraints
->max_uV
= max_uV
;
994 static int machine_constraints_current(struct regulator_dev
*rdev
,
995 struct regulation_constraints
*constraints
)
997 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1000 if (!constraints
->min_uA
&& !constraints
->max_uA
)
1003 if (constraints
->min_uA
> constraints
->max_uA
) {
1004 rdev_err(rdev
, "Invalid current constraints\n");
1008 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
1009 rdev_warn(rdev
, "Operation of current configuration missing\n");
1013 /* Set regulator current in constraints range */
1014 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
1015 constraints
->max_uA
);
1017 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
1024 static int _regulator_do_enable(struct regulator_dev
*rdev
);
1027 * set_machine_constraints - sets regulator constraints
1028 * @rdev: regulator source
1029 * @constraints: constraints to apply
1031 * Allows platform initialisation code to define and constrain
1032 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1033 * Constraints *must* be set by platform code in order for some
1034 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1037 static int set_machine_constraints(struct regulator_dev
*rdev
,
1038 const struct regulation_constraints
*constraints
)
1041 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1044 rdev
->constraints
= kmemdup(constraints
, sizeof(*constraints
),
1047 rdev
->constraints
= kzalloc(sizeof(*constraints
),
1049 if (!rdev
->constraints
)
1052 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
1056 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
1060 if (rdev
->constraints
->ilim_uA
&& ops
->set_input_current_limit
) {
1061 ret
= ops
->set_input_current_limit(rdev
,
1062 rdev
->constraints
->ilim_uA
);
1064 rdev_err(rdev
, "failed to set input limit\n");
1069 /* do we need to setup our suspend state */
1070 if (rdev
->constraints
->initial_state
) {
1071 ret
= suspend_prepare(rdev
, rdev
->constraints
->initial_state
);
1073 rdev_err(rdev
, "failed to set suspend state\n");
1078 if (rdev
->constraints
->initial_mode
) {
1079 if (!ops
->set_mode
) {
1080 rdev_err(rdev
, "no set_mode operation\n");
1084 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1086 rdev_err(rdev
, "failed to set initial mode: %d\n", ret
);
1091 /* If the constraints say the regulator should be on at this point
1092 * and we have control then make sure it is enabled.
1094 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
1095 ret
= _regulator_do_enable(rdev
);
1096 if (ret
< 0 && ret
!= -EINVAL
) {
1097 rdev_err(rdev
, "failed to enable\n");
1102 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1103 && ops
->set_ramp_delay
) {
1104 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1106 rdev_err(rdev
, "failed to set ramp_delay\n");
1111 if (rdev
->constraints
->pull_down
&& ops
->set_pull_down
) {
1112 ret
= ops
->set_pull_down(rdev
);
1114 rdev_err(rdev
, "failed to set pull down\n");
1119 if (rdev
->constraints
->soft_start
&& ops
->set_soft_start
) {
1120 ret
= ops
->set_soft_start(rdev
);
1122 rdev_err(rdev
, "failed to set soft start\n");
1127 if (rdev
->constraints
->over_current_protection
1128 && ops
->set_over_current_protection
) {
1129 ret
= ops
->set_over_current_protection(rdev
);
1131 rdev_err(rdev
, "failed to set over current protection\n");
1136 if (rdev
->constraints
->active_discharge
&& ops
->set_active_discharge
) {
1137 bool ad_state
= (rdev
->constraints
->active_discharge
==
1138 REGULATOR_ACTIVE_DISCHARGE_ENABLE
) ? true : false;
1140 ret
= ops
->set_active_discharge(rdev
, ad_state
);
1142 rdev_err(rdev
, "failed to set active discharge\n");
1147 print_constraints(rdev
);
1152 * set_supply - set regulator supply regulator
1153 * @rdev: regulator name
1154 * @supply_rdev: supply regulator name
1156 * Called by platform initialisation code to set the supply regulator for this
1157 * regulator. This ensures that a regulators supply will also be enabled by the
1158 * core if it's child is enabled.
1160 static int set_supply(struct regulator_dev
*rdev
,
1161 struct regulator_dev
*supply_rdev
)
1165 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1167 if (!try_module_get(supply_rdev
->owner
))
1170 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1171 if (rdev
->supply
== NULL
) {
1175 supply_rdev
->open_count
++;
1181 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1182 * @rdev: regulator source
1183 * @consumer_dev_name: dev_name() string for device supply applies to
1184 * @supply: symbolic name for supply
1186 * Allows platform initialisation code to map physical regulator
1187 * sources to symbolic names for supplies for use by devices. Devices
1188 * should use these symbolic names to request regulators, avoiding the
1189 * need to provide board-specific regulator names as platform data.
1191 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1192 const char *consumer_dev_name
,
1195 struct regulator_map
*node
;
1201 if (consumer_dev_name
!= NULL
)
1206 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1207 if (node
->dev_name
&& consumer_dev_name
) {
1208 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1210 } else if (node
->dev_name
|| consumer_dev_name
) {
1214 if (strcmp(node
->supply
, supply
) != 0)
1217 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1219 dev_name(&node
->regulator
->dev
),
1220 node
->regulator
->desc
->name
,
1222 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1226 node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1230 node
->regulator
= rdev
;
1231 node
->supply
= supply
;
1234 node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1235 if (node
->dev_name
== NULL
) {
1241 list_add(&node
->list
, ®ulator_map_list
);
1245 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1247 struct regulator_map
*node
, *n
;
1249 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1250 if (rdev
== node
->regulator
) {
1251 list_del(&node
->list
);
1252 kfree(node
->dev_name
);
1258 #ifdef CONFIG_DEBUG_FS
1259 static ssize_t
constraint_flags_read_file(struct file
*file
,
1260 char __user
*user_buf
,
1261 size_t count
, loff_t
*ppos
)
1263 const struct regulator
*regulator
= file
->private_data
;
1264 const struct regulation_constraints
*c
= regulator
->rdev
->constraints
;
1271 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
1275 ret
= snprintf(buf
, PAGE_SIZE
,
1279 "ramp_disable: %u\n"
1282 "over_current_protection: %u\n",
1289 c
->over_current_protection
);
1291 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
1299 static const struct file_operations constraint_flags_fops
= {
1300 #ifdef CONFIG_DEBUG_FS
1301 .open
= simple_open
,
1302 .read
= constraint_flags_read_file
,
1303 .llseek
= default_llseek
,
1307 #define REG_STR_SIZE 64
1309 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1311 const char *supply_name
)
1313 struct regulator
*regulator
;
1314 char buf
[REG_STR_SIZE
];
1317 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1318 if (regulator
== NULL
)
1321 mutex_lock(&rdev
->mutex
);
1322 regulator
->rdev
= rdev
;
1323 list_add(®ulator
->list
, &rdev
->consumer_list
);
1326 regulator
->dev
= dev
;
1328 /* Add a link to the device sysfs entry */
1329 size
= scnprintf(buf
, REG_STR_SIZE
, "%s-%s",
1330 dev
->kobj
.name
, supply_name
);
1331 if (size
>= REG_STR_SIZE
)
1334 regulator
->supply_name
= kstrdup(buf
, GFP_KERNEL
);
1335 if (regulator
->supply_name
== NULL
)
1338 err
= sysfs_create_link_nowarn(&rdev
->dev
.kobj
, &dev
->kobj
,
1341 rdev_dbg(rdev
, "could not add device link %s err %d\n",
1342 dev
->kobj
.name
, err
);
1346 regulator
->supply_name
= kstrdup(supply_name
, GFP_KERNEL
);
1347 if (regulator
->supply_name
== NULL
)
1351 regulator
->debugfs
= debugfs_create_dir(regulator
->supply_name
,
1353 if (!regulator
->debugfs
) {
1354 rdev_dbg(rdev
, "Failed to create debugfs directory\n");
1356 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1357 ®ulator
->uA_load
);
1358 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1359 ®ulator
->min_uV
);
1360 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1361 ®ulator
->max_uV
);
1362 debugfs_create_file("constraint_flags", 0444,
1363 regulator
->debugfs
, regulator
,
1364 &constraint_flags_fops
);
1368 * Check now if the regulator is an always on regulator - if
1369 * it is then we don't need to do nearly so much work for
1370 * enable/disable calls.
1372 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
) &&
1373 _regulator_is_enabled(rdev
))
1374 regulator
->always_on
= true;
1376 mutex_unlock(&rdev
->mutex
);
1379 list_del(®ulator
->list
);
1381 mutex_unlock(&rdev
->mutex
);
1385 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1387 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1388 return rdev
->constraints
->enable_time
;
1389 if (!rdev
->desc
->ops
->enable_time
)
1390 return rdev
->desc
->enable_time
;
1391 return rdev
->desc
->ops
->enable_time(rdev
);
1394 static struct regulator_supply_alias
*regulator_find_supply_alias(
1395 struct device
*dev
, const char *supply
)
1397 struct regulator_supply_alias
*map
;
1399 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1400 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1406 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1408 struct regulator_supply_alias
*map
;
1410 map
= regulator_find_supply_alias(*dev
, *supply
);
1412 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1413 *supply
, map
->alias_supply
,
1414 dev_name(map
->alias_dev
));
1415 *dev
= map
->alias_dev
;
1416 *supply
= map
->alias_supply
;
1420 static int of_node_match(struct device
*dev
, const void *data
)
1422 return dev
->of_node
== data
;
1425 static struct regulator_dev
*of_find_regulator_by_node(struct device_node
*np
)
1429 dev
= class_find_device(®ulator_class
, NULL
, np
, of_node_match
);
1431 return dev
? dev_to_rdev(dev
) : NULL
;
1434 static int regulator_match(struct device
*dev
, const void *data
)
1436 struct regulator_dev
*r
= dev_to_rdev(dev
);
1438 return strcmp(rdev_get_name(r
), data
) == 0;
1441 static struct regulator_dev
*regulator_lookup_by_name(const char *name
)
1445 dev
= class_find_device(®ulator_class
, NULL
, name
, regulator_match
);
1447 return dev
? dev_to_rdev(dev
) : NULL
;
1451 * regulator_dev_lookup - lookup a regulator device.
1452 * @dev: device for regulator "consumer".
1453 * @supply: Supply name or regulator ID.
1454 * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if
1455 * lookup could succeed in the future.
1457 * If successful, returns a struct regulator_dev that corresponds to the name
1458 * @supply and with the embedded struct device refcount incremented by one.
1459 * The refcount must be dropped by calling put_device().
1460 * On failure one of the following ERR-PTR-encoded values is returned:
1461 * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
1464 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1467 struct regulator_dev
*r
;
1468 struct device_node
*node
;
1469 struct regulator_map
*map
;
1470 const char *devname
= NULL
;
1472 regulator_supply_alias(&dev
, &supply
);
1474 /* first do a dt based lookup */
1475 if (dev
&& dev
->of_node
) {
1476 node
= of_get_regulator(dev
, supply
);
1478 r
= of_find_regulator_by_node(node
);
1483 * We have a node, but there is no device.
1484 * assume it has not registered yet.
1486 return ERR_PTR(-EPROBE_DEFER
);
1490 /* if not found, try doing it non-dt way */
1492 devname
= dev_name(dev
);
1494 r
= regulator_lookup_by_name(supply
);
1498 mutex_lock(®ulator_list_mutex
);
1499 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1500 /* If the mapping has a device set up it must match */
1501 if (map
->dev_name
&&
1502 (!devname
|| strcmp(map
->dev_name
, devname
)))
1505 if (strcmp(map
->supply
, supply
) == 0 &&
1506 get_device(&map
->regulator
->dev
)) {
1511 mutex_unlock(®ulator_list_mutex
);
1516 return ERR_PTR(-ENODEV
);
1519 static int regulator_resolve_supply(struct regulator_dev
*rdev
)
1521 struct regulator_dev
*r
;
1522 struct device
*dev
= rdev
->dev
.parent
;
1525 /* No supply to resovle? */
1526 if (!rdev
->supply_name
)
1529 /* Supply already resolved? */
1533 r
= regulator_dev_lookup(dev
, rdev
->supply_name
);
1537 if (ret
== -ENODEV
) {
1539 * No supply was specified for this regulator and
1540 * there will never be one.
1545 /* Did the lookup explicitly defer for us? */
1546 if (ret
== -EPROBE_DEFER
)
1549 if (have_full_constraints()) {
1550 r
= dummy_regulator_rdev
;
1551 get_device(&r
->dev
);
1553 dev_err(dev
, "Failed to resolve %s-supply for %s\n",
1554 rdev
->supply_name
, rdev
->desc
->name
);
1555 return -EPROBE_DEFER
;
1560 * If the supply's parent device is not the same as the
1561 * regulator's parent device, then ensure the parent device
1562 * is bound before we resolve the supply, in case the parent
1563 * device get probe deferred and unregisters the supply.
1565 if (r
->dev
.parent
&& r
->dev
.parent
!= rdev
->dev
.parent
) {
1566 if (!device_is_bound(r
->dev
.parent
)) {
1567 put_device(&r
->dev
);
1568 return -EPROBE_DEFER
;
1572 /* Recursively resolve the supply of the supply */
1573 ret
= regulator_resolve_supply(r
);
1575 put_device(&r
->dev
);
1579 ret
= set_supply(rdev
, r
);
1581 put_device(&r
->dev
);
1585 /* Cascade always-on state to supply */
1586 if (_regulator_is_enabled(rdev
)) {
1587 ret
= regulator_enable(rdev
->supply
);
1589 _regulator_put(rdev
->supply
);
1590 rdev
->supply
= NULL
;
1598 /* Internal regulator request function */
1599 struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1600 enum regulator_get_type get_type
)
1602 struct regulator_dev
*rdev
;
1603 struct regulator
*regulator
;
1604 const char *devname
= dev
? dev_name(dev
) : "deviceless";
1607 if (get_type
>= MAX_GET_TYPE
) {
1608 dev_err(dev
, "invalid type %d in %s\n", get_type
, __func__
);
1609 return ERR_PTR(-EINVAL
);
1613 pr_err("get() with no identifier\n");
1614 return ERR_PTR(-EINVAL
);
1617 rdev
= regulator_dev_lookup(dev
, id
);
1619 ret
= PTR_ERR(rdev
);
1622 * If regulator_dev_lookup() fails with error other
1623 * than -ENODEV our job here is done, we simply return it.
1626 return ERR_PTR(ret
);
1628 if (!have_full_constraints()) {
1630 "incomplete constraints, dummy supplies not allowed\n");
1631 return ERR_PTR(-ENODEV
);
1637 * Assume that a regulator is physically present and
1638 * enabled, even if it isn't hooked up, and just
1642 "%s supply %s not found, using dummy regulator\n",
1644 rdev
= dummy_regulator_rdev
;
1645 get_device(&rdev
->dev
);
1650 "dummy supplies not allowed for exclusive requests\n");
1654 return ERR_PTR(-ENODEV
);
1658 if (rdev
->exclusive
) {
1659 regulator
= ERR_PTR(-EPERM
);
1660 put_device(&rdev
->dev
);
1664 if (get_type
== EXCLUSIVE_GET
&& rdev
->open_count
) {
1665 regulator
= ERR_PTR(-EBUSY
);
1666 put_device(&rdev
->dev
);
1670 ret
= regulator_resolve_supply(rdev
);
1672 regulator
= ERR_PTR(ret
);
1673 put_device(&rdev
->dev
);
1677 if (!try_module_get(rdev
->owner
)) {
1678 regulator
= ERR_PTR(-EPROBE_DEFER
);
1679 put_device(&rdev
->dev
);
1683 regulator
= create_regulator(rdev
, dev
, id
);
1684 if (regulator
== NULL
) {
1685 regulator
= ERR_PTR(-ENOMEM
);
1686 put_device(&rdev
->dev
);
1687 module_put(rdev
->owner
);
1692 if (get_type
== EXCLUSIVE_GET
) {
1693 rdev
->exclusive
= 1;
1695 ret
= _regulator_is_enabled(rdev
);
1697 rdev
->use_count
= 1;
1699 rdev
->use_count
= 0;
1706 * regulator_get - lookup and obtain a reference to a regulator.
1707 * @dev: device for regulator "consumer"
1708 * @id: Supply name or regulator ID.
1710 * Returns a struct regulator corresponding to the regulator producer,
1711 * or IS_ERR() condition containing errno.
1713 * Use of supply names configured via regulator_set_device_supply() is
1714 * strongly encouraged. It is recommended that the supply name used
1715 * should match the name used for the supply and/or the relevant
1716 * device pins in the datasheet.
1718 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
1720 return _regulator_get(dev
, id
, NORMAL_GET
);
1722 EXPORT_SYMBOL_GPL(regulator_get
);
1725 * regulator_get_exclusive - obtain exclusive access to a regulator.
1726 * @dev: device for regulator "consumer"
1727 * @id: Supply name or regulator ID.
1729 * Returns a struct regulator corresponding to the regulator producer,
1730 * or IS_ERR() condition containing errno. Other consumers will be
1731 * unable to obtain this regulator while this reference is held and the
1732 * use count for the regulator will be initialised to reflect the current
1733 * state of the regulator.
1735 * This is intended for use by consumers which cannot tolerate shared
1736 * use of the regulator such as those which need to force the
1737 * regulator off for correct operation of the hardware they are
1740 * Use of supply names configured via regulator_set_device_supply() is
1741 * strongly encouraged. It is recommended that the supply name used
1742 * should match the name used for the supply and/or the relevant
1743 * device pins in the datasheet.
1745 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
1747 return _regulator_get(dev
, id
, EXCLUSIVE_GET
);
1749 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
1752 * regulator_get_optional - obtain optional access to a regulator.
1753 * @dev: device for regulator "consumer"
1754 * @id: Supply name or regulator ID.
1756 * Returns a struct regulator corresponding to the regulator producer,
1757 * or IS_ERR() condition containing errno.
1759 * This is intended for use by consumers for devices which can have
1760 * some supplies unconnected in normal use, such as some MMC devices.
1761 * It can allow the regulator core to provide stub supplies for other
1762 * supplies requested using normal regulator_get() calls without
1763 * disrupting the operation of drivers that can handle absent
1766 * Use of supply names configured via regulator_set_device_supply() is
1767 * strongly encouraged. It is recommended that the supply name used
1768 * should match the name used for the supply and/or the relevant
1769 * device pins in the datasheet.
1771 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
1773 return _regulator_get(dev
, id
, OPTIONAL_GET
);
1775 EXPORT_SYMBOL_GPL(regulator_get_optional
);
1777 /* regulator_list_mutex lock held by regulator_put() */
1778 static void _regulator_put(struct regulator
*regulator
)
1780 struct regulator_dev
*rdev
;
1782 if (IS_ERR_OR_NULL(regulator
))
1785 lockdep_assert_held_once(®ulator_list_mutex
);
1787 rdev
= regulator
->rdev
;
1789 debugfs_remove_recursive(regulator
->debugfs
);
1791 /* remove any sysfs entries */
1793 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
1794 mutex_lock(&rdev
->mutex
);
1795 list_del(®ulator
->list
);
1798 rdev
->exclusive
= 0;
1799 put_device(&rdev
->dev
);
1800 mutex_unlock(&rdev
->mutex
);
1802 kfree(regulator
->supply_name
);
1805 module_put(rdev
->owner
);
1809 * regulator_put - "free" the regulator source
1810 * @regulator: regulator source
1812 * Note: drivers must ensure that all regulator_enable calls made on this
1813 * regulator source are balanced by regulator_disable calls prior to calling
1816 void regulator_put(struct regulator
*regulator
)
1818 mutex_lock(®ulator_list_mutex
);
1819 _regulator_put(regulator
);
1820 mutex_unlock(®ulator_list_mutex
);
1822 EXPORT_SYMBOL_GPL(regulator_put
);
1825 * regulator_register_supply_alias - Provide device alias for supply lookup
1827 * @dev: device that will be given as the regulator "consumer"
1828 * @id: Supply name or regulator ID
1829 * @alias_dev: device that should be used to lookup the supply
1830 * @alias_id: Supply name or regulator ID that should be used to lookup the
1833 * All lookups for id on dev will instead be conducted for alias_id on
1836 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
1837 struct device
*alias_dev
,
1838 const char *alias_id
)
1840 struct regulator_supply_alias
*map
;
1842 map
= regulator_find_supply_alias(dev
, id
);
1846 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
1851 map
->src_supply
= id
;
1852 map
->alias_dev
= alias_dev
;
1853 map
->alias_supply
= alias_id
;
1855 list_add(&map
->list
, ®ulator_supply_alias_list
);
1857 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1858 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
1862 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
1865 * regulator_unregister_supply_alias - Remove device alias
1867 * @dev: device that will be given as the regulator "consumer"
1868 * @id: Supply name or regulator ID
1870 * Remove a lookup alias if one exists for id on dev.
1872 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
1874 struct regulator_supply_alias
*map
;
1876 map
= regulator_find_supply_alias(dev
, id
);
1878 list_del(&map
->list
);
1882 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
1885 * regulator_bulk_register_supply_alias - register multiple aliases
1887 * @dev: device that will be given as the regulator "consumer"
1888 * @id: List of supply names or regulator IDs
1889 * @alias_dev: device that should be used to lookup the supply
1890 * @alias_id: List of supply names or regulator IDs that should be used to
1892 * @num_id: Number of aliases to register
1894 * @return 0 on success, an errno on failure.
1896 * This helper function allows drivers to register several supply
1897 * aliases in one operation. If any of the aliases cannot be
1898 * registered any aliases that were registered will be removed
1899 * before returning to the caller.
1901 int regulator_bulk_register_supply_alias(struct device
*dev
,
1902 const char *const *id
,
1903 struct device
*alias_dev
,
1904 const char *const *alias_id
,
1910 for (i
= 0; i
< num_id
; ++i
) {
1911 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
1921 "Failed to create supply alias %s,%s -> %s,%s\n",
1922 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
1925 regulator_unregister_supply_alias(dev
, id
[i
]);
1929 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
1932 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1934 * @dev: device that will be given as the regulator "consumer"
1935 * @id: List of supply names or regulator IDs
1936 * @num_id: Number of aliases to unregister
1938 * This helper function allows drivers to unregister several supply
1939 * aliases in one operation.
1941 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
1942 const char *const *id
,
1947 for (i
= 0; i
< num_id
; ++i
)
1948 regulator_unregister_supply_alias(dev
, id
[i
]);
1950 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
1953 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1954 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
1955 const struct regulator_config
*config
)
1957 struct regulator_enable_gpio
*pin
;
1958 struct gpio_desc
*gpiod
;
1961 gpiod
= gpio_to_desc(config
->ena_gpio
);
1963 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
1964 if (pin
->gpiod
== gpiod
) {
1965 rdev_dbg(rdev
, "GPIO %d is already used\n",
1967 goto update_ena_gpio_to_rdev
;
1971 ret
= gpio_request_one(config
->ena_gpio
,
1972 GPIOF_DIR_OUT
| config
->ena_gpio_flags
,
1973 rdev_get_name(rdev
));
1977 pin
= kzalloc(sizeof(struct regulator_enable_gpio
), GFP_KERNEL
);
1979 gpio_free(config
->ena_gpio
);
1984 pin
->ena_gpio_invert
= config
->ena_gpio_invert
;
1985 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
1987 update_ena_gpio_to_rdev
:
1988 pin
->request_count
++;
1989 rdev
->ena_pin
= pin
;
1993 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
1995 struct regulator_enable_gpio
*pin
, *n
;
2000 /* Free the GPIO only in case of no use */
2001 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
2002 if (pin
->gpiod
== rdev
->ena_pin
->gpiod
) {
2003 if (pin
->request_count
<= 1) {
2004 pin
->request_count
= 0;
2005 gpiod_put(pin
->gpiod
);
2006 list_del(&pin
->list
);
2008 rdev
->ena_pin
= NULL
;
2011 pin
->request_count
--;
2018 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
2019 * @rdev: regulator_dev structure
2020 * @enable: enable GPIO at initial use?
2022 * GPIO is enabled in case of initial use. (enable_count is 0)
2023 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2025 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
2027 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
2033 /* Enable GPIO at initial use */
2034 if (pin
->enable_count
== 0)
2035 gpiod_set_value_cansleep(pin
->gpiod
,
2036 !pin
->ena_gpio_invert
);
2038 pin
->enable_count
++;
2040 if (pin
->enable_count
> 1) {
2041 pin
->enable_count
--;
2045 /* Disable GPIO if not used */
2046 if (pin
->enable_count
<= 1) {
2047 gpiod_set_value_cansleep(pin
->gpiod
,
2048 pin
->ena_gpio_invert
);
2049 pin
->enable_count
= 0;
2057 * _regulator_enable_delay - a delay helper function
2058 * @delay: time to delay in microseconds
2060 * Delay for the requested amount of time as per the guidelines in:
2062 * Documentation/timers/timers-howto.txt
2064 * The assumption here is that regulators will never be enabled in
2065 * atomic context and therefore sleeping functions can be used.
2067 static void _regulator_enable_delay(unsigned int delay
)
2069 unsigned int ms
= delay
/ 1000;
2070 unsigned int us
= delay
% 1000;
2074 * For small enough values, handle super-millisecond
2075 * delays in the usleep_range() call below.
2084 * Give the scheduler some room to coalesce with any other
2085 * wakeup sources. For delays shorter than 10 us, don't even
2086 * bother setting up high-resolution timers and just busy-
2090 usleep_range(us
, us
+ 100);
2095 static int _regulator_do_enable(struct regulator_dev
*rdev
)
2099 /* Query before enabling in case configuration dependent. */
2100 ret
= _regulator_get_enable_time(rdev
);
2104 rdev_warn(rdev
, "enable_time() failed: %d\n", ret
);
2108 trace_regulator_enable(rdev_get_name(rdev
));
2110 if (rdev
->desc
->off_on_delay
) {
2111 /* if needed, keep a distance of off_on_delay from last time
2112 * this regulator was disabled.
2114 unsigned long start_jiffy
= jiffies
;
2115 unsigned long intended
, max_delay
, remaining
;
2117 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
2118 intended
= rdev
->last_off_jiffy
+ max_delay
;
2120 if (time_before(start_jiffy
, intended
)) {
2121 /* calc remaining jiffies to deal with one-time
2123 * in case of multiple timer wrapping, either it can be
2124 * detected by out-of-range remaining, or it cannot be
2125 * detected and we gets a panelty of
2126 * _regulator_enable_delay().
2128 remaining
= intended
- start_jiffy
;
2129 if (remaining
<= max_delay
)
2130 _regulator_enable_delay(
2131 jiffies_to_usecs(remaining
));
2135 if (rdev
->ena_pin
) {
2136 if (!rdev
->ena_gpio_state
) {
2137 ret
= regulator_ena_gpio_ctrl(rdev
, true);
2140 rdev
->ena_gpio_state
= 1;
2142 } else if (rdev
->desc
->ops
->enable
) {
2143 ret
= rdev
->desc
->ops
->enable(rdev
);
2150 /* Allow the regulator to ramp; it would be useful to extend
2151 * this for bulk operations so that the regulators can ramp
2153 trace_regulator_enable_delay(rdev_get_name(rdev
));
2155 _regulator_enable_delay(delay
);
2157 trace_regulator_enable_complete(rdev_get_name(rdev
));
2162 /* locks held by regulator_enable() */
2163 static int _regulator_enable(struct regulator_dev
*rdev
)
2167 lockdep_assert_held_once(&rdev
->mutex
);
2169 /* check voltage and requested load before enabling */
2170 if (regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_DRMS
))
2171 drms_uA_update(rdev
);
2173 if (rdev
->use_count
== 0) {
2174 /* The regulator may on if it's not switchable or left on */
2175 ret
= _regulator_is_enabled(rdev
);
2176 if (ret
== -EINVAL
|| ret
== 0) {
2177 if (!regulator_ops_is_valid(rdev
,
2178 REGULATOR_CHANGE_STATUS
))
2181 ret
= _regulator_do_enable(rdev
);
2185 } else if (ret
< 0) {
2186 rdev_err(rdev
, "is_enabled() failed: %d\n", ret
);
2189 /* Fallthrough on positive return values - already enabled */
2198 * regulator_enable - enable regulator output
2199 * @regulator: regulator source
2201 * Request that the regulator be enabled with the regulator output at
2202 * the predefined voltage or current value. Calls to regulator_enable()
2203 * must be balanced with calls to regulator_disable().
2205 * NOTE: the output value can be set by other drivers, boot loader or may be
2206 * hardwired in the regulator.
2208 int regulator_enable(struct regulator
*regulator
)
2210 struct regulator_dev
*rdev
= regulator
->rdev
;
2213 if (regulator
->always_on
)
2217 ret
= regulator_enable(rdev
->supply
);
2222 mutex_lock(&rdev
->mutex
);
2223 ret
= _regulator_enable(rdev
);
2224 mutex_unlock(&rdev
->mutex
);
2226 if (ret
!= 0 && rdev
->supply
)
2227 regulator_disable(rdev
->supply
);
2231 EXPORT_SYMBOL_GPL(regulator_enable
);
2233 static int _regulator_do_disable(struct regulator_dev
*rdev
)
2237 trace_regulator_disable(rdev_get_name(rdev
));
2239 if (rdev
->ena_pin
) {
2240 if (rdev
->ena_gpio_state
) {
2241 ret
= regulator_ena_gpio_ctrl(rdev
, false);
2244 rdev
->ena_gpio_state
= 0;
2247 } else if (rdev
->desc
->ops
->disable
) {
2248 ret
= rdev
->desc
->ops
->disable(rdev
);
2253 /* cares about last_off_jiffy only if off_on_delay is required by
2256 if (rdev
->desc
->off_on_delay
)
2257 rdev
->last_off_jiffy
= jiffies
;
2259 trace_regulator_disable_complete(rdev_get_name(rdev
));
2264 /* locks held by regulator_disable() */
2265 static int _regulator_disable(struct regulator_dev
*rdev
)
2269 lockdep_assert_held_once(&rdev
->mutex
);
2271 if (WARN(rdev
->use_count
<= 0,
2272 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
2275 /* are we the last user and permitted to disable ? */
2276 if (rdev
->use_count
== 1 &&
2277 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
2279 /* we are last user */
2280 if (regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
)) {
2281 ret
= _notifier_call_chain(rdev
,
2282 REGULATOR_EVENT_PRE_DISABLE
,
2284 if (ret
& NOTIFY_STOP_MASK
)
2287 ret
= _regulator_do_disable(rdev
);
2289 rdev_err(rdev
, "failed to disable\n");
2290 _notifier_call_chain(rdev
,
2291 REGULATOR_EVENT_ABORT_DISABLE
,
2295 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
2299 rdev
->use_count
= 0;
2300 } else if (rdev
->use_count
> 1) {
2301 if (regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_DRMS
))
2302 drms_uA_update(rdev
);
2311 * regulator_disable - disable regulator output
2312 * @regulator: regulator source
2314 * Disable the regulator output voltage or current. Calls to
2315 * regulator_enable() must be balanced with calls to
2316 * regulator_disable().
2318 * NOTE: this will only disable the regulator output if no other consumer
2319 * devices have it enabled, the regulator device supports disabling and
2320 * machine constraints permit this operation.
2322 int regulator_disable(struct regulator
*regulator
)
2324 struct regulator_dev
*rdev
= regulator
->rdev
;
2327 if (regulator
->always_on
)
2330 mutex_lock(&rdev
->mutex
);
2331 ret
= _regulator_disable(rdev
);
2332 mutex_unlock(&rdev
->mutex
);
2334 if (ret
== 0 && rdev
->supply
)
2335 regulator_disable(rdev
->supply
);
2339 EXPORT_SYMBOL_GPL(regulator_disable
);
2341 /* locks held by regulator_force_disable() */
2342 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2346 lockdep_assert_held_once(&rdev
->mutex
);
2348 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2349 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2350 if (ret
& NOTIFY_STOP_MASK
)
2353 ret
= _regulator_do_disable(rdev
);
2355 rdev_err(rdev
, "failed to force disable\n");
2356 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2357 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2361 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2362 REGULATOR_EVENT_DISABLE
, NULL
);
2368 * regulator_force_disable - force disable regulator output
2369 * @regulator: regulator source
2371 * Forcibly disable the regulator output voltage or current.
2372 * NOTE: this *will* disable the regulator output even if other consumer
2373 * devices have it enabled. This should be used for situations when device
2374 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2376 int regulator_force_disable(struct regulator
*regulator
)
2378 struct regulator_dev
*rdev
= regulator
->rdev
;
2381 mutex_lock(&rdev
->mutex
);
2382 regulator
->uA_load
= 0;
2383 ret
= _regulator_force_disable(regulator
->rdev
);
2384 mutex_unlock(&rdev
->mutex
);
2387 while (rdev
->open_count
--)
2388 regulator_disable(rdev
->supply
);
2392 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2394 static void regulator_disable_work(struct work_struct
*work
)
2396 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2400 mutex_lock(&rdev
->mutex
);
2402 BUG_ON(!rdev
->deferred_disables
);
2404 count
= rdev
->deferred_disables
;
2405 rdev
->deferred_disables
= 0;
2407 for (i
= 0; i
< count
; i
++) {
2408 ret
= _regulator_disable(rdev
);
2410 rdev_err(rdev
, "Deferred disable failed: %d\n", ret
);
2413 mutex_unlock(&rdev
->mutex
);
2416 for (i
= 0; i
< count
; i
++) {
2417 ret
= regulator_disable(rdev
->supply
);
2420 "Supply disable failed: %d\n", ret
);
2427 * regulator_disable_deferred - disable regulator output with delay
2428 * @regulator: regulator source
2429 * @ms: miliseconds until the regulator is disabled
2431 * Execute regulator_disable() on the regulator after a delay. This
2432 * is intended for use with devices that require some time to quiesce.
2434 * NOTE: this will only disable the regulator output if no other consumer
2435 * devices have it enabled, the regulator device supports disabling and
2436 * machine constraints permit this operation.
2438 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2440 struct regulator_dev
*rdev
= regulator
->rdev
;
2442 if (regulator
->always_on
)
2446 return regulator_disable(regulator
);
2448 mutex_lock(&rdev
->mutex
);
2449 rdev
->deferred_disables
++;
2450 mutex_unlock(&rdev
->mutex
);
2452 queue_delayed_work(system_power_efficient_wq
, &rdev
->disable_work
,
2453 msecs_to_jiffies(ms
));
2456 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2458 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2460 /* A GPIO control always takes precedence */
2462 return rdev
->ena_gpio_state
;
2464 /* If we don't know then assume that the regulator is always on */
2465 if (!rdev
->desc
->ops
->is_enabled
)
2468 return rdev
->desc
->ops
->is_enabled(rdev
);
2471 static int _regulator_list_voltage(struct regulator
*regulator
,
2472 unsigned selector
, int lock
)
2474 struct regulator_dev
*rdev
= regulator
->rdev
;
2475 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2478 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2479 return rdev
->desc
->fixed_uV
;
2481 if (ops
->list_voltage
) {
2482 if (selector
>= rdev
->desc
->n_voltages
)
2485 mutex_lock(&rdev
->mutex
);
2486 ret
= ops
->list_voltage(rdev
, selector
);
2488 mutex_unlock(&rdev
->mutex
);
2489 } else if (rdev
->supply
) {
2490 ret
= _regulator_list_voltage(rdev
->supply
, selector
, lock
);
2496 if (ret
< rdev
->constraints
->min_uV
)
2498 else if (ret
> rdev
->constraints
->max_uV
)
2506 * regulator_is_enabled - is the regulator output enabled
2507 * @regulator: regulator source
2509 * Returns positive if the regulator driver backing the source/client
2510 * has requested that the device be enabled, zero if it hasn't, else a
2511 * negative errno code.
2513 * Note that the device backing this regulator handle can have multiple
2514 * users, so it might be enabled even if regulator_enable() was never
2515 * called for this particular source.
2517 int regulator_is_enabled(struct regulator
*regulator
)
2521 if (regulator
->always_on
)
2524 mutex_lock(®ulator
->rdev
->mutex
);
2525 ret
= _regulator_is_enabled(regulator
->rdev
);
2526 mutex_unlock(®ulator
->rdev
->mutex
);
2530 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
2533 * regulator_count_voltages - count regulator_list_voltage() selectors
2534 * @regulator: regulator source
2536 * Returns number of selectors, or negative errno. Selectors are
2537 * numbered starting at zero, and typically correspond to bitfields
2538 * in hardware registers.
2540 int regulator_count_voltages(struct regulator
*regulator
)
2542 struct regulator_dev
*rdev
= regulator
->rdev
;
2544 if (rdev
->desc
->n_voltages
)
2545 return rdev
->desc
->n_voltages
;
2550 return regulator_count_voltages(rdev
->supply
);
2552 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
2555 * regulator_list_voltage - enumerate supported voltages
2556 * @regulator: regulator source
2557 * @selector: identify voltage to list
2558 * Context: can sleep
2560 * Returns a voltage that can be passed to @regulator_set_voltage(),
2561 * zero if this selector code can't be used on this system, or a
2564 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
2566 return _regulator_list_voltage(regulator
, selector
, 1);
2568 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
2571 * regulator_get_regmap - get the regulator's register map
2572 * @regulator: regulator source
2574 * Returns the register map for the given regulator, or an ERR_PTR value
2575 * if the regulator doesn't use regmap.
2577 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
2579 struct regmap
*map
= regulator
->rdev
->regmap
;
2581 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
2585 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2586 * @regulator: regulator source
2587 * @vsel_reg: voltage selector register, output parameter
2588 * @vsel_mask: mask for voltage selector bitfield, output parameter
2590 * Returns the hardware register offset and bitmask used for setting the
2591 * regulator voltage. This might be useful when configuring voltage-scaling
2592 * hardware or firmware that can make I2C requests behind the kernel's back,
2595 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2596 * and 0 is returned, otherwise a negative errno is returned.
2598 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
2600 unsigned *vsel_mask
)
2602 struct regulator_dev
*rdev
= regulator
->rdev
;
2603 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2605 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2608 *vsel_reg
= rdev
->desc
->vsel_reg
;
2609 *vsel_mask
= rdev
->desc
->vsel_mask
;
2613 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
2616 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2617 * @regulator: regulator source
2618 * @selector: identify voltage to list
2620 * Converts the selector to a hardware-specific voltage selector that can be
2621 * directly written to the regulator registers. The address of the voltage
2622 * register can be determined by calling @regulator_get_hardware_vsel_register.
2624 * On error a negative errno is returned.
2626 int regulator_list_hardware_vsel(struct regulator
*regulator
,
2629 struct regulator_dev
*rdev
= regulator
->rdev
;
2630 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2632 if (selector
>= rdev
->desc
->n_voltages
)
2634 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
2639 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
2642 * regulator_get_linear_step - return the voltage step size between VSEL values
2643 * @regulator: regulator source
2645 * Returns the voltage step size between VSEL values for linear
2646 * regulators, or return 0 if the regulator isn't a linear regulator.
2648 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
2650 struct regulator_dev
*rdev
= regulator
->rdev
;
2652 return rdev
->desc
->uV_step
;
2654 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
2657 * regulator_is_supported_voltage - check if a voltage range can be supported
2659 * @regulator: Regulator to check.
2660 * @min_uV: Minimum required voltage in uV.
2661 * @max_uV: Maximum required voltage in uV.
2663 * Returns a boolean or a negative error code.
2665 int regulator_is_supported_voltage(struct regulator
*regulator
,
2666 int min_uV
, int max_uV
)
2668 struct regulator_dev
*rdev
= regulator
->rdev
;
2669 int i
, voltages
, ret
;
2671 /* If we can't change voltage check the current voltage */
2672 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
2673 ret
= regulator_get_voltage(regulator
);
2675 return min_uV
<= ret
&& ret
<= max_uV
;
2680 /* Any voltage within constrains range is fine? */
2681 if (rdev
->desc
->continuous_voltage_range
)
2682 return min_uV
>= rdev
->constraints
->min_uV
&&
2683 max_uV
<= rdev
->constraints
->max_uV
;
2685 ret
= regulator_count_voltages(regulator
);
2690 for (i
= 0; i
< voltages
; i
++) {
2691 ret
= regulator_list_voltage(regulator
, i
);
2693 if (ret
>= min_uV
&& ret
<= max_uV
)
2699 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
2701 static int regulator_map_voltage(struct regulator_dev
*rdev
, int min_uV
,
2704 const struct regulator_desc
*desc
= rdev
->desc
;
2706 if (desc
->ops
->map_voltage
)
2707 return desc
->ops
->map_voltage(rdev
, min_uV
, max_uV
);
2709 if (desc
->ops
->list_voltage
== regulator_list_voltage_linear
)
2710 return regulator_map_voltage_linear(rdev
, min_uV
, max_uV
);
2712 if (desc
->ops
->list_voltage
== regulator_list_voltage_linear_range
)
2713 return regulator_map_voltage_linear_range(rdev
, min_uV
, max_uV
);
2715 return regulator_map_voltage_iterate(rdev
, min_uV
, max_uV
);
2718 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
2719 int min_uV
, int max_uV
,
2722 struct pre_voltage_change_data data
;
2725 data
.old_uV
= _regulator_get_voltage(rdev
);
2726 data
.min_uV
= min_uV
;
2727 data
.max_uV
= max_uV
;
2728 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2730 if (ret
& NOTIFY_STOP_MASK
)
2733 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
2737 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2738 (void *)data
.old_uV
);
2743 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
2744 int uV
, unsigned selector
)
2746 struct pre_voltage_change_data data
;
2749 data
.old_uV
= _regulator_get_voltage(rdev
);
2752 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
2754 if (ret
& NOTIFY_STOP_MASK
)
2757 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
2761 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
2762 (void *)data
.old_uV
);
2767 static int _regulator_set_voltage_time(struct regulator_dev
*rdev
,
2768 int old_uV
, int new_uV
)
2770 unsigned int ramp_delay
= 0;
2772 if (rdev
->constraints
->ramp_delay
)
2773 ramp_delay
= rdev
->constraints
->ramp_delay
;
2774 else if (rdev
->desc
->ramp_delay
)
2775 ramp_delay
= rdev
->desc
->ramp_delay
;
2777 if (ramp_delay
== 0) {
2778 rdev_dbg(rdev
, "ramp_delay not set\n");
2782 return DIV_ROUND_UP(abs(new_uV
- old_uV
), ramp_delay
);
2785 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
2786 int min_uV
, int max_uV
)
2791 unsigned int selector
;
2792 int old_selector
= -1;
2793 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2794 int old_uV
= _regulator_get_voltage(rdev
);
2796 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
2798 min_uV
+= rdev
->constraints
->uV_offset
;
2799 max_uV
+= rdev
->constraints
->uV_offset
;
2802 * If we can't obtain the old selector there is not enough
2803 * info to call set_voltage_time_sel().
2805 if (_regulator_is_enabled(rdev
) &&
2806 ops
->set_voltage_time_sel
&& ops
->get_voltage_sel
) {
2807 old_selector
= ops
->get_voltage_sel(rdev
);
2808 if (old_selector
< 0)
2809 return old_selector
;
2812 if (ops
->set_voltage
) {
2813 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
2817 if (ops
->list_voltage
)
2818 best_val
= ops
->list_voltage(rdev
,
2821 best_val
= _regulator_get_voltage(rdev
);
2824 } else if (ops
->set_voltage_sel
) {
2825 ret
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
2827 best_val
= ops
->list_voltage(rdev
, ret
);
2828 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
2830 if (old_selector
== selector
)
2833 ret
= _regulator_call_set_voltage_sel(
2834 rdev
, best_val
, selector
);
2846 if (ops
->set_voltage_time_sel
) {
2848 * Call set_voltage_time_sel if successfully obtained
2851 if (old_selector
>= 0 && old_selector
!= selector
)
2852 delay
= ops
->set_voltage_time_sel(rdev
, old_selector
,
2855 if (old_uV
!= best_val
) {
2856 if (ops
->set_voltage_time
)
2857 delay
= ops
->set_voltage_time(rdev
, old_uV
,
2860 delay
= _regulator_set_voltage_time(rdev
,
2867 rdev_warn(rdev
, "failed to get delay: %d\n", delay
);
2871 /* Insert any necessary delays */
2872 if (delay
>= 1000) {
2873 mdelay(delay
/ 1000);
2874 udelay(delay
% 1000);
2879 if (best_val
>= 0) {
2880 unsigned long data
= best_val
;
2882 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
2887 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
2892 static int regulator_set_voltage_unlocked(struct regulator
*regulator
,
2893 int min_uV
, int max_uV
)
2895 struct regulator_dev
*rdev
= regulator
->rdev
;
2897 int old_min_uV
, old_max_uV
;
2899 int best_supply_uV
= 0;
2900 int supply_change_uV
= 0;
2902 /* If we're setting the same range as last time the change
2903 * should be a noop (some cpufreq implementations use the same
2904 * voltage for multiple frequencies, for example).
2906 if (regulator
->min_uV
== min_uV
&& regulator
->max_uV
== max_uV
)
2909 /* If we're trying to set a range that overlaps the current voltage,
2910 * return successfully even though the regulator does not support
2911 * changing the voltage.
2913 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
2914 current_uV
= _regulator_get_voltage(rdev
);
2915 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
2916 regulator
->min_uV
= min_uV
;
2917 regulator
->max_uV
= max_uV
;
2923 if (!rdev
->desc
->ops
->set_voltage
&&
2924 !rdev
->desc
->ops
->set_voltage_sel
) {
2929 /* constraints check */
2930 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
2934 /* restore original values in case of error */
2935 old_min_uV
= regulator
->min_uV
;
2936 old_max_uV
= regulator
->max_uV
;
2937 regulator
->min_uV
= min_uV
;
2938 regulator
->max_uV
= max_uV
;
2940 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
2944 if (rdev
->supply
&& (rdev
->desc
->min_dropout_uV
||
2945 !rdev
->desc
->ops
->get_voltage
)) {
2946 int current_supply_uV
;
2949 selector
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
2955 best_supply_uV
= _regulator_list_voltage(regulator
, selector
, 0);
2956 if (best_supply_uV
< 0) {
2957 ret
= best_supply_uV
;
2961 best_supply_uV
+= rdev
->desc
->min_dropout_uV
;
2963 current_supply_uV
= _regulator_get_voltage(rdev
->supply
->rdev
);
2964 if (current_supply_uV
< 0) {
2965 ret
= current_supply_uV
;
2969 supply_change_uV
= best_supply_uV
- current_supply_uV
;
2972 if (supply_change_uV
> 0) {
2973 ret
= regulator_set_voltage_unlocked(rdev
->supply
,
2974 best_supply_uV
, INT_MAX
);
2976 dev_err(&rdev
->dev
, "Failed to increase supply voltage: %d\n",
2982 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
2986 if (supply_change_uV
< 0) {
2987 ret
= regulator_set_voltage_unlocked(rdev
->supply
,
2988 best_supply_uV
, INT_MAX
);
2990 dev_warn(&rdev
->dev
, "Failed to decrease supply voltage: %d\n",
2992 /* No need to fail here */
2999 regulator
->min_uV
= old_min_uV
;
3000 regulator
->max_uV
= old_max_uV
;
3006 * regulator_set_voltage - set regulator output voltage
3007 * @regulator: regulator source
3008 * @min_uV: Minimum required voltage in uV
3009 * @max_uV: Maximum acceptable voltage in uV
3011 * Sets a voltage regulator to the desired output voltage. This can be set
3012 * during any regulator state. IOW, regulator can be disabled or enabled.
3014 * If the regulator is enabled then the voltage will change to the new value
3015 * immediately otherwise if the regulator is disabled the regulator will
3016 * output at the new voltage when enabled.
3018 * NOTE: If the regulator is shared between several devices then the lowest
3019 * request voltage that meets the system constraints will be used.
3020 * Regulator system constraints must be set for this regulator before
3021 * calling this function otherwise this call will fail.
3023 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
3027 regulator_lock_supply(regulator
->rdev
);
3029 ret
= regulator_set_voltage_unlocked(regulator
, min_uV
, max_uV
);
3031 regulator_unlock_supply(regulator
->rdev
);
3035 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
3038 * regulator_set_voltage_time - get raise/fall time
3039 * @regulator: regulator source
3040 * @old_uV: starting voltage in microvolts
3041 * @new_uV: target voltage in microvolts
3043 * Provided with the starting and ending voltage, this function attempts to
3044 * calculate the time in microseconds required to rise or fall to this new
3047 int regulator_set_voltage_time(struct regulator
*regulator
,
3048 int old_uV
, int new_uV
)
3050 struct regulator_dev
*rdev
= regulator
->rdev
;
3051 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3057 if (ops
->set_voltage_time
)
3058 return ops
->set_voltage_time(rdev
, old_uV
, new_uV
);
3059 else if (!ops
->set_voltage_time_sel
)
3060 return _regulator_set_voltage_time(rdev
, old_uV
, new_uV
);
3062 /* Currently requires operations to do this */
3063 if (!ops
->list_voltage
|| !rdev
->desc
->n_voltages
)
3066 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
3067 /* We only look for exact voltage matches here */
3068 voltage
= regulator_list_voltage(regulator
, i
);
3073 if (voltage
== old_uV
)
3075 if (voltage
== new_uV
)
3079 if (old_sel
< 0 || new_sel
< 0)
3082 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
3084 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
3087 * regulator_set_voltage_time_sel - get raise/fall time
3088 * @rdev: regulator source device
3089 * @old_selector: selector for starting voltage
3090 * @new_selector: selector for target voltage
3092 * Provided with the starting and target voltage selectors, this function
3093 * returns time in microseconds required to rise or fall to this new voltage
3095 * Drivers providing ramp_delay in regulation_constraints can use this as their
3096 * set_voltage_time_sel() operation.
3098 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
3099 unsigned int old_selector
,
3100 unsigned int new_selector
)
3102 int old_volt
, new_volt
;
3105 if (!rdev
->desc
->ops
->list_voltage
)
3108 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
3109 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
3111 if (rdev
->desc
->ops
->set_voltage_time
)
3112 return rdev
->desc
->ops
->set_voltage_time(rdev
, old_volt
,
3115 return _regulator_set_voltage_time(rdev
, old_volt
, new_volt
);
3117 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
3120 * regulator_sync_voltage - re-apply last regulator output voltage
3121 * @regulator: regulator source
3123 * Re-apply the last configured voltage. This is intended to be used
3124 * where some external control source the consumer is cooperating with
3125 * has caused the configured voltage to change.
3127 int regulator_sync_voltage(struct regulator
*regulator
)
3129 struct regulator_dev
*rdev
= regulator
->rdev
;
3130 int ret
, min_uV
, max_uV
;
3132 mutex_lock(&rdev
->mutex
);
3134 if (!rdev
->desc
->ops
->set_voltage
&&
3135 !rdev
->desc
->ops
->set_voltage_sel
) {
3140 /* This is only going to work if we've had a voltage configured. */
3141 if (!regulator
->min_uV
&& !regulator
->max_uV
) {
3146 min_uV
= regulator
->min_uV
;
3147 max_uV
= regulator
->max_uV
;
3149 /* This should be a paranoia check... */
3150 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
3154 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
);
3158 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
3161 mutex_unlock(&rdev
->mutex
);
3164 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
3166 static int _regulator_get_voltage(struct regulator_dev
*rdev
)
3171 if (rdev
->desc
->ops
->get_bypass
) {
3172 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypassed
);
3176 /* if bypassed the regulator must have a supply */
3177 if (!rdev
->supply
) {
3179 "bypassed regulator has no supply!\n");
3180 return -EPROBE_DEFER
;
3183 return _regulator_get_voltage(rdev
->supply
->rdev
);
3187 if (rdev
->desc
->ops
->get_voltage_sel
) {
3188 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
3191 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
3192 } else if (rdev
->desc
->ops
->get_voltage
) {
3193 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
3194 } else if (rdev
->desc
->ops
->list_voltage
) {
3195 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
3196 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
3197 ret
= rdev
->desc
->fixed_uV
;
3198 } else if (rdev
->supply
) {
3199 ret
= _regulator_get_voltage(rdev
->supply
->rdev
);
3206 return ret
- rdev
->constraints
->uV_offset
;
3210 * regulator_get_voltage - get regulator output voltage
3211 * @regulator: regulator source
3213 * This returns the current regulator voltage in uV.
3215 * NOTE: If the regulator is disabled it will return the voltage value. This
3216 * function should not be used to determine regulator state.
3218 int regulator_get_voltage(struct regulator
*regulator
)
3222 regulator_lock_supply(regulator
->rdev
);
3224 ret
= _regulator_get_voltage(regulator
->rdev
);
3226 regulator_unlock_supply(regulator
->rdev
);
3230 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
3233 * regulator_set_current_limit - set regulator output current limit
3234 * @regulator: regulator source
3235 * @min_uA: Minimum supported current in uA
3236 * @max_uA: Maximum supported current in uA
3238 * Sets current sink to the desired output current. This can be set during
3239 * any regulator state. IOW, regulator can be disabled or enabled.
3241 * If the regulator is enabled then the current will change to the new value
3242 * immediately otherwise if the regulator is disabled the regulator will
3243 * output at the new current when enabled.
3245 * NOTE: Regulator system constraints must be set for this regulator before
3246 * calling this function otherwise this call will fail.
3248 int regulator_set_current_limit(struct regulator
*regulator
,
3249 int min_uA
, int max_uA
)
3251 struct regulator_dev
*rdev
= regulator
->rdev
;
3254 mutex_lock(&rdev
->mutex
);
3257 if (!rdev
->desc
->ops
->set_current_limit
) {
3262 /* constraints check */
3263 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
3267 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
3269 mutex_unlock(&rdev
->mutex
);
3272 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
3274 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
3278 mutex_lock(&rdev
->mutex
);
3281 if (!rdev
->desc
->ops
->get_current_limit
) {
3286 ret
= rdev
->desc
->ops
->get_current_limit(rdev
);
3288 mutex_unlock(&rdev
->mutex
);
3293 * regulator_get_current_limit - get regulator output current
3294 * @regulator: regulator source
3296 * This returns the current supplied by the specified current sink in uA.
3298 * NOTE: If the regulator is disabled it will return the current value. This
3299 * function should not be used to determine regulator state.
3301 int regulator_get_current_limit(struct regulator
*regulator
)
3303 return _regulator_get_current_limit(regulator
->rdev
);
3305 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
3308 * regulator_set_mode - set regulator operating mode
3309 * @regulator: regulator source
3310 * @mode: operating mode - one of the REGULATOR_MODE constants
3312 * Set regulator operating mode to increase regulator efficiency or improve
3313 * regulation performance.
3315 * NOTE: Regulator system constraints must be set for this regulator before
3316 * calling this function otherwise this call will fail.
3318 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
3320 struct regulator_dev
*rdev
= regulator
->rdev
;
3322 int regulator_curr_mode
;
3324 mutex_lock(&rdev
->mutex
);
3327 if (!rdev
->desc
->ops
->set_mode
) {
3332 /* return if the same mode is requested */
3333 if (rdev
->desc
->ops
->get_mode
) {
3334 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
3335 if (regulator_curr_mode
== mode
) {
3341 /* constraints check */
3342 ret
= regulator_mode_constrain(rdev
, &mode
);
3346 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
3348 mutex_unlock(&rdev
->mutex
);
3351 EXPORT_SYMBOL_GPL(regulator_set_mode
);
3353 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
3357 mutex_lock(&rdev
->mutex
);
3360 if (!rdev
->desc
->ops
->get_mode
) {
3365 ret
= rdev
->desc
->ops
->get_mode(rdev
);
3367 mutex_unlock(&rdev
->mutex
);
3372 * regulator_get_mode - get regulator operating mode
3373 * @regulator: regulator source
3375 * Get the current regulator operating mode.
3377 unsigned int regulator_get_mode(struct regulator
*regulator
)
3379 return _regulator_get_mode(regulator
->rdev
);
3381 EXPORT_SYMBOL_GPL(regulator_get_mode
);
3383 static int _regulator_get_error_flags(struct regulator_dev
*rdev
,
3384 unsigned int *flags
)
3388 mutex_lock(&rdev
->mutex
);
3391 if (!rdev
->desc
->ops
->get_error_flags
) {
3396 ret
= rdev
->desc
->ops
->get_error_flags(rdev
, flags
);
3398 mutex_unlock(&rdev
->mutex
);
3403 * regulator_get_error_flags - get regulator error information
3404 * @regulator: regulator source
3405 * @flags: pointer to store error flags
3407 * Get the current regulator error information.
3409 int regulator_get_error_flags(struct regulator
*regulator
,
3410 unsigned int *flags
)
3412 return _regulator_get_error_flags(regulator
->rdev
, flags
);
3414 EXPORT_SYMBOL_GPL(regulator_get_error_flags
);
3417 * regulator_set_load - set regulator load
3418 * @regulator: regulator source
3419 * @uA_load: load current
3421 * Notifies the regulator core of a new device load. This is then used by
3422 * DRMS (if enabled by constraints) to set the most efficient regulator
3423 * operating mode for the new regulator loading.
3425 * Consumer devices notify their supply regulator of the maximum power
3426 * they will require (can be taken from device datasheet in the power
3427 * consumption tables) when they change operational status and hence power
3428 * state. Examples of operational state changes that can affect power
3429 * consumption are :-
3431 * o Device is opened / closed.
3432 * o Device I/O is about to begin or has just finished.
3433 * o Device is idling in between work.
3435 * This information is also exported via sysfs to userspace.
3437 * DRMS will sum the total requested load on the regulator and change
3438 * to the most efficient operating mode if platform constraints allow.
3440 * On error a negative errno is returned.
3442 int regulator_set_load(struct regulator
*regulator
, int uA_load
)
3444 struct regulator_dev
*rdev
= regulator
->rdev
;
3447 mutex_lock(&rdev
->mutex
);
3448 regulator
->uA_load
= uA_load
;
3449 ret
= drms_uA_update(rdev
);
3450 mutex_unlock(&rdev
->mutex
);
3454 EXPORT_SYMBOL_GPL(regulator_set_load
);
3457 * regulator_allow_bypass - allow the regulator to go into bypass mode
3459 * @regulator: Regulator to configure
3460 * @enable: enable or disable bypass mode
3462 * Allow the regulator to go into bypass mode if all other consumers
3463 * for the regulator also enable bypass mode and the machine
3464 * constraints allow this. Bypass mode means that the regulator is
3465 * simply passing the input directly to the output with no regulation.
3467 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
3469 struct regulator_dev
*rdev
= regulator
->rdev
;
3472 if (!rdev
->desc
->ops
->set_bypass
)
3475 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_BYPASS
))
3478 mutex_lock(&rdev
->mutex
);
3480 if (enable
&& !regulator
->bypass
) {
3481 rdev
->bypass_count
++;
3483 if (rdev
->bypass_count
== rdev
->open_count
) {
3484 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3486 rdev
->bypass_count
--;
3489 } else if (!enable
&& regulator
->bypass
) {
3490 rdev
->bypass_count
--;
3492 if (rdev
->bypass_count
!= rdev
->open_count
) {
3493 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
3495 rdev
->bypass_count
++;
3500 regulator
->bypass
= enable
;
3502 mutex_unlock(&rdev
->mutex
);
3506 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
3509 * regulator_register_notifier - register regulator event notifier
3510 * @regulator: regulator source
3511 * @nb: notifier block
3513 * Register notifier block to receive regulator events.
3515 int regulator_register_notifier(struct regulator
*regulator
,
3516 struct notifier_block
*nb
)
3518 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
3521 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
3524 * regulator_unregister_notifier - unregister regulator event notifier
3525 * @regulator: regulator source
3526 * @nb: notifier block
3528 * Unregister regulator event notifier block.
3530 int regulator_unregister_notifier(struct regulator
*regulator
,
3531 struct notifier_block
*nb
)
3533 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
3536 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
3538 /* notify regulator consumers and downstream regulator consumers.
3539 * Note mutex must be held by caller.
3541 static int _notifier_call_chain(struct regulator_dev
*rdev
,
3542 unsigned long event
, void *data
)
3544 /* call rdev chain first */
3545 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
3549 * regulator_bulk_get - get multiple regulator consumers
3551 * @dev: Device to supply
3552 * @num_consumers: Number of consumers to register
3553 * @consumers: Configuration of consumers; clients are stored here.
3555 * @return 0 on success, an errno on failure.
3557 * This helper function allows drivers to get several regulator
3558 * consumers in one operation. If any of the regulators cannot be
3559 * acquired then any regulators that were allocated will be freed
3560 * before returning to the caller.
3562 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
3563 struct regulator_bulk_data
*consumers
)
3568 for (i
= 0; i
< num_consumers
; i
++)
3569 consumers
[i
].consumer
= NULL
;
3571 for (i
= 0; i
< num_consumers
; i
++) {
3572 consumers
[i
].consumer
= regulator_get(dev
,
3573 consumers
[i
].supply
);
3574 if (IS_ERR(consumers
[i
].consumer
)) {
3575 ret
= PTR_ERR(consumers
[i
].consumer
);
3576 dev_err(dev
, "Failed to get supply '%s': %d\n",
3577 consumers
[i
].supply
, ret
);
3578 consumers
[i
].consumer
= NULL
;
3587 regulator_put(consumers
[i
].consumer
);
3591 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
3593 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
3595 struct regulator_bulk_data
*bulk
= data
;
3597 bulk
->ret
= regulator_enable(bulk
->consumer
);
3601 * regulator_bulk_enable - enable multiple regulator consumers
3603 * @num_consumers: Number of consumers
3604 * @consumers: Consumer data; clients are stored here.
3605 * @return 0 on success, an errno on failure
3607 * This convenience API allows consumers to enable multiple regulator
3608 * clients in a single API call. If any consumers cannot be enabled
3609 * then any others that were enabled will be disabled again prior to
3612 int regulator_bulk_enable(int num_consumers
,
3613 struct regulator_bulk_data
*consumers
)
3615 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
3619 for (i
= 0; i
< num_consumers
; i
++) {
3620 if (consumers
[i
].consumer
->always_on
)
3621 consumers
[i
].ret
= 0;
3623 async_schedule_domain(regulator_bulk_enable_async
,
3624 &consumers
[i
], &async_domain
);
3627 async_synchronize_full_domain(&async_domain
);
3629 /* If any consumer failed we need to unwind any that succeeded */
3630 for (i
= 0; i
< num_consumers
; i
++) {
3631 if (consumers
[i
].ret
!= 0) {
3632 ret
= consumers
[i
].ret
;
3640 for (i
= 0; i
< num_consumers
; i
++) {
3641 if (consumers
[i
].ret
< 0)
3642 pr_err("Failed to enable %s: %d\n", consumers
[i
].supply
,
3645 regulator_disable(consumers
[i
].consumer
);
3650 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
3653 * regulator_bulk_disable - disable multiple regulator consumers
3655 * @num_consumers: Number of consumers
3656 * @consumers: Consumer data; clients are stored here.
3657 * @return 0 on success, an errno on failure
3659 * This convenience API allows consumers to disable multiple regulator
3660 * clients in a single API call. If any consumers cannot be disabled
3661 * then any others that were disabled will be enabled again prior to
3664 int regulator_bulk_disable(int num_consumers
,
3665 struct regulator_bulk_data
*consumers
)
3670 for (i
= num_consumers
- 1; i
>= 0; --i
) {
3671 ret
= regulator_disable(consumers
[i
].consumer
);
3679 pr_err("Failed to disable %s: %d\n", consumers
[i
].supply
, ret
);
3680 for (++i
; i
< num_consumers
; ++i
) {
3681 r
= regulator_enable(consumers
[i
].consumer
);
3683 pr_err("Failed to re-enable %s: %d\n",
3684 consumers
[i
].supply
, r
);
3689 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
3692 * regulator_bulk_force_disable - force disable multiple regulator consumers
3694 * @num_consumers: Number of consumers
3695 * @consumers: Consumer data; clients are stored here.
3696 * @return 0 on success, an errno on failure
3698 * This convenience API allows consumers to forcibly disable multiple regulator
3699 * clients in a single API call.
3700 * NOTE: This should be used for situations when device damage will
3701 * likely occur if the regulators are not disabled (e.g. over temp).
3702 * Although regulator_force_disable function call for some consumers can
3703 * return error numbers, the function is called for all consumers.
3705 int regulator_bulk_force_disable(int num_consumers
,
3706 struct regulator_bulk_data
*consumers
)
3711 for (i
= 0; i
< num_consumers
; i
++) {
3713 regulator_force_disable(consumers
[i
].consumer
);
3715 /* Store first error for reporting */
3716 if (consumers
[i
].ret
&& !ret
)
3717 ret
= consumers
[i
].ret
;
3722 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
3725 * regulator_bulk_free - free multiple regulator consumers
3727 * @num_consumers: Number of consumers
3728 * @consumers: Consumer data; clients are stored here.
3730 * This convenience API allows consumers to free multiple regulator
3731 * clients in a single API call.
3733 void regulator_bulk_free(int num_consumers
,
3734 struct regulator_bulk_data
*consumers
)
3738 for (i
= 0; i
< num_consumers
; i
++) {
3739 regulator_put(consumers
[i
].consumer
);
3740 consumers
[i
].consumer
= NULL
;
3743 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
3746 * regulator_notifier_call_chain - call regulator event notifier
3747 * @rdev: regulator source
3748 * @event: notifier block
3749 * @data: callback-specific data.
3751 * Called by regulator drivers to notify clients a regulator event has
3752 * occurred. We also notify regulator clients downstream.
3753 * Note lock must be held by caller.
3755 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
3756 unsigned long event
, void *data
)
3758 lockdep_assert_held_once(&rdev
->mutex
);
3760 _notifier_call_chain(rdev
, event
, data
);
3764 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
3767 * regulator_mode_to_status - convert a regulator mode into a status
3769 * @mode: Mode to convert
3771 * Convert a regulator mode into a status.
3773 int regulator_mode_to_status(unsigned int mode
)
3776 case REGULATOR_MODE_FAST
:
3777 return REGULATOR_STATUS_FAST
;
3778 case REGULATOR_MODE_NORMAL
:
3779 return REGULATOR_STATUS_NORMAL
;
3780 case REGULATOR_MODE_IDLE
:
3781 return REGULATOR_STATUS_IDLE
;
3782 case REGULATOR_MODE_STANDBY
:
3783 return REGULATOR_STATUS_STANDBY
;
3785 return REGULATOR_STATUS_UNDEFINED
;
3788 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
3790 static struct attribute
*regulator_dev_attrs
[] = {
3791 &dev_attr_name
.attr
,
3792 &dev_attr_num_users
.attr
,
3793 &dev_attr_type
.attr
,
3794 &dev_attr_microvolts
.attr
,
3795 &dev_attr_microamps
.attr
,
3796 &dev_attr_opmode
.attr
,
3797 &dev_attr_state
.attr
,
3798 &dev_attr_status
.attr
,
3799 &dev_attr_bypass
.attr
,
3800 &dev_attr_requested_microamps
.attr
,
3801 &dev_attr_min_microvolts
.attr
,
3802 &dev_attr_max_microvolts
.attr
,
3803 &dev_attr_min_microamps
.attr
,
3804 &dev_attr_max_microamps
.attr
,
3805 &dev_attr_suspend_standby_state
.attr
,
3806 &dev_attr_suspend_mem_state
.attr
,
3807 &dev_attr_suspend_disk_state
.attr
,
3808 &dev_attr_suspend_standby_microvolts
.attr
,
3809 &dev_attr_suspend_mem_microvolts
.attr
,
3810 &dev_attr_suspend_disk_microvolts
.attr
,
3811 &dev_attr_suspend_standby_mode
.attr
,
3812 &dev_attr_suspend_mem_mode
.attr
,
3813 &dev_attr_suspend_disk_mode
.attr
,
3818 * To avoid cluttering sysfs (and memory) with useless state, only
3819 * create attributes that can be meaningfully displayed.
3821 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
3822 struct attribute
*attr
, int idx
)
3824 struct device
*dev
= kobj_to_dev(kobj
);
3825 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
3826 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3827 umode_t mode
= attr
->mode
;
3829 /* these three are always present */
3830 if (attr
== &dev_attr_name
.attr
||
3831 attr
== &dev_attr_num_users
.attr
||
3832 attr
== &dev_attr_type
.attr
)
3835 /* some attributes need specific methods to be displayed */
3836 if (attr
== &dev_attr_microvolts
.attr
) {
3837 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
3838 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
3839 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
3840 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
3845 if (attr
== &dev_attr_microamps
.attr
)
3846 return ops
->get_current_limit
? mode
: 0;
3848 if (attr
== &dev_attr_opmode
.attr
)
3849 return ops
->get_mode
? mode
: 0;
3851 if (attr
== &dev_attr_state
.attr
)
3852 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
3854 if (attr
== &dev_attr_status
.attr
)
3855 return ops
->get_status
? mode
: 0;
3857 if (attr
== &dev_attr_bypass
.attr
)
3858 return ops
->get_bypass
? mode
: 0;
3860 /* some attributes are type-specific */
3861 if (attr
== &dev_attr_requested_microamps
.attr
)
3862 return rdev
->desc
->type
== REGULATOR_CURRENT
? mode
: 0;
3864 /* constraints need specific supporting methods */
3865 if (attr
== &dev_attr_min_microvolts
.attr
||
3866 attr
== &dev_attr_max_microvolts
.attr
)
3867 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
3869 if (attr
== &dev_attr_min_microamps
.attr
||
3870 attr
== &dev_attr_max_microamps
.attr
)
3871 return ops
->set_current_limit
? mode
: 0;
3873 if (attr
== &dev_attr_suspend_standby_state
.attr
||
3874 attr
== &dev_attr_suspend_mem_state
.attr
||
3875 attr
== &dev_attr_suspend_disk_state
.attr
)
3878 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
3879 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
3880 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
3881 return ops
->set_suspend_voltage
? mode
: 0;
3883 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
3884 attr
== &dev_attr_suspend_mem_mode
.attr
||
3885 attr
== &dev_attr_suspend_disk_mode
.attr
)
3886 return ops
->set_suspend_mode
? mode
: 0;
3891 static const struct attribute_group regulator_dev_group
= {
3892 .attrs
= regulator_dev_attrs
,
3893 .is_visible
= regulator_attr_is_visible
,
3896 static const struct attribute_group
*regulator_dev_groups
[] = {
3897 ®ulator_dev_group
,
3901 static void regulator_dev_release(struct device
*dev
)
3903 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
3905 kfree(rdev
->constraints
);
3906 of_node_put(rdev
->dev
.of_node
);
3910 static struct class regulator_class
= {
3911 .name
= "regulator",
3912 .dev_release
= regulator_dev_release
,
3913 .dev_groups
= regulator_dev_groups
,
3916 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
3918 struct device
*parent
= rdev
->dev
.parent
;
3919 const char *rname
= rdev_get_name(rdev
);
3920 char name
[NAME_MAX
];
3922 /* Avoid duplicate debugfs directory names */
3923 if (parent
&& rname
== rdev
->desc
->name
) {
3924 snprintf(name
, sizeof(name
), "%s-%s", dev_name(parent
),
3929 rdev
->debugfs
= debugfs_create_dir(rname
, debugfs_root
);
3930 if (!rdev
->debugfs
) {
3931 rdev_warn(rdev
, "Failed to create debugfs directory\n");
3935 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
3937 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
3939 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
3940 &rdev
->bypass_count
);
3943 static int regulator_register_resolve_supply(struct device
*dev
, void *data
)
3945 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
3947 if (regulator_resolve_supply(rdev
))
3948 rdev_dbg(rdev
, "unable to resolve supply\n");
3954 * regulator_register - register regulator
3955 * @regulator_desc: regulator to register
3956 * @cfg: runtime configuration for regulator
3958 * Called by regulator drivers to register a regulator.
3959 * Returns a valid pointer to struct regulator_dev on success
3960 * or an ERR_PTR() on error.
3962 struct regulator_dev
*
3963 regulator_register(const struct regulator_desc
*regulator_desc
,
3964 const struct regulator_config
*cfg
)
3966 const struct regulation_constraints
*constraints
= NULL
;
3967 const struct regulator_init_data
*init_data
;
3968 struct regulator_config
*config
= NULL
;
3969 static atomic_t regulator_no
= ATOMIC_INIT(-1);
3970 struct regulator_dev
*rdev
;
3974 if (regulator_desc
== NULL
|| cfg
== NULL
)
3975 return ERR_PTR(-EINVAL
);
3980 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
)
3981 return ERR_PTR(-EINVAL
);
3983 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
3984 regulator_desc
->type
!= REGULATOR_CURRENT
)
3985 return ERR_PTR(-EINVAL
);
3987 /* Only one of each should be implemented */
3988 WARN_ON(regulator_desc
->ops
->get_voltage
&&
3989 regulator_desc
->ops
->get_voltage_sel
);
3990 WARN_ON(regulator_desc
->ops
->set_voltage
&&
3991 regulator_desc
->ops
->set_voltage_sel
);
3993 /* If we're using selectors we must implement list_voltage. */
3994 if (regulator_desc
->ops
->get_voltage_sel
&&
3995 !regulator_desc
->ops
->list_voltage
) {
3996 return ERR_PTR(-EINVAL
);
3998 if (regulator_desc
->ops
->set_voltage_sel
&&
3999 !regulator_desc
->ops
->list_voltage
) {
4000 return ERR_PTR(-EINVAL
);
4003 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
4005 return ERR_PTR(-ENOMEM
);
4008 * Duplicate the config so the driver could override it after
4009 * parsing init data.
4011 config
= kmemdup(cfg
, sizeof(*cfg
), GFP_KERNEL
);
4012 if (config
== NULL
) {
4014 return ERR_PTR(-ENOMEM
);
4017 init_data
= regulator_of_get_init_data(dev
, regulator_desc
, config
,
4018 &rdev
->dev
.of_node
);
4020 init_data
= config
->init_data
;
4021 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
4024 mutex_init(&rdev
->mutex
);
4025 rdev
->reg_data
= config
->driver_data
;
4026 rdev
->owner
= regulator_desc
->owner
;
4027 rdev
->desc
= regulator_desc
;
4029 rdev
->regmap
= config
->regmap
;
4030 else if (dev_get_regmap(dev
, NULL
))
4031 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
4032 else if (dev
->parent
)
4033 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
4034 INIT_LIST_HEAD(&rdev
->consumer_list
);
4035 INIT_LIST_HEAD(&rdev
->list
);
4036 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
4037 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
4039 /* preform any regulator specific init */
4040 if (init_data
&& init_data
->regulator_init
) {
4041 ret
= init_data
->regulator_init(rdev
->reg_data
);
4046 if ((config
->ena_gpio
|| config
->ena_gpio_initialized
) &&
4047 gpio_is_valid(config
->ena_gpio
)) {
4048 mutex_lock(®ulator_list_mutex
);
4049 ret
= regulator_ena_gpio_request(rdev
, config
);
4050 mutex_unlock(®ulator_list_mutex
);
4052 rdev_err(rdev
, "Failed to request enable GPIO%d: %d\n",
4053 config
->ena_gpio
, ret
);
4058 /* register with sysfs */
4059 rdev
->dev
.class = ®ulator_class
;
4060 rdev
->dev
.parent
= dev
;
4061 dev_set_name(&rdev
->dev
, "regulator.%lu",
4062 (unsigned long) atomic_inc_return(®ulator_no
));
4064 /* set regulator constraints */
4066 constraints
= &init_data
->constraints
;
4068 if (init_data
&& init_data
->supply_regulator
)
4069 rdev
->supply_name
= init_data
->supply_regulator
;
4070 else if (regulator_desc
->supply_name
)
4071 rdev
->supply_name
= regulator_desc
->supply_name
;
4074 * Attempt to resolve the regulator supply, if specified,
4075 * but don't return an error if we fail because we will try
4076 * to resolve it again later as more regulators are added.
4078 if (regulator_resolve_supply(rdev
))
4079 rdev_dbg(rdev
, "unable to resolve supply\n");
4081 ret
= set_machine_constraints(rdev
, constraints
);
4085 /* add consumers devices */
4087 mutex_lock(®ulator_list_mutex
);
4088 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
4089 ret
= set_consumer_device_supply(rdev
,
4090 init_data
->consumer_supplies
[i
].dev_name
,
4091 init_data
->consumer_supplies
[i
].supply
);
4093 mutex_unlock(®ulator_list_mutex
);
4094 dev_err(dev
, "Failed to set supply %s\n",
4095 init_data
->consumer_supplies
[i
].supply
);
4096 goto unset_supplies
;
4099 mutex_unlock(®ulator_list_mutex
);
4102 ret
= device_register(&rdev
->dev
);
4104 put_device(&rdev
->dev
);
4105 goto unset_supplies
;
4108 dev_set_drvdata(&rdev
->dev
, rdev
);
4109 rdev_init_debugfs(rdev
);
4111 /* try to resolve regulators supply since a new one was registered */
4112 class_for_each_device(®ulator_class
, NULL
, NULL
,
4113 regulator_register_resolve_supply
);
4118 mutex_lock(®ulator_list_mutex
);
4119 unset_regulator_supplies(rdev
);
4120 mutex_unlock(®ulator_list_mutex
);
4122 kfree(rdev
->constraints
);
4123 mutex_lock(®ulator_list_mutex
);
4124 regulator_ena_gpio_free(rdev
);
4125 mutex_unlock(®ulator_list_mutex
);
4129 return ERR_PTR(ret
);
4131 EXPORT_SYMBOL_GPL(regulator_register
);
4134 * regulator_unregister - unregister regulator
4135 * @rdev: regulator to unregister
4137 * Called by regulator drivers to unregister a regulator.
4139 void regulator_unregister(struct regulator_dev
*rdev
)
4145 while (rdev
->use_count
--)
4146 regulator_disable(rdev
->supply
);
4147 regulator_put(rdev
->supply
);
4149 mutex_lock(®ulator_list_mutex
);
4150 debugfs_remove_recursive(rdev
->debugfs
);
4151 flush_work(&rdev
->disable_work
.work
);
4152 WARN_ON(rdev
->open_count
);
4153 unset_regulator_supplies(rdev
);
4154 list_del(&rdev
->list
);
4155 regulator_ena_gpio_free(rdev
);
4156 mutex_unlock(®ulator_list_mutex
);
4157 device_unregister(&rdev
->dev
);
4159 EXPORT_SYMBOL_GPL(regulator_unregister
);
4161 static int _regulator_suspend_prepare(struct device
*dev
, void *data
)
4163 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4164 const suspend_state_t
*state
= data
;
4167 mutex_lock(&rdev
->mutex
);
4168 ret
= suspend_prepare(rdev
, *state
);
4169 mutex_unlock(&rdev
->mutex
);
4175 * regulator_suspend_prepare - prepare regulators for system wide suspend
4176 * @state: system suspend state
4178 * Configure each regulator with it's suspend operating parameters for state.
4179 * This will usually be called by machine suspend code prior to supending.
4181 int regulator_suspend_prepare(suspend_state_t state
)
4183 /* ON is handled by regulator active state */
4184 if (state
== PM_SUSPEND_ON
)
4187 return class_for_each_device(®ulator_class
, NULL
, &state
,
4188 _regulator_suspend_prepare
);
4190 EXPORT_SYMBOL_GPL(regulator_suspend_prepare
);
4192 static int _regulator_suspend_finish(struct device
*dev
, void *data
)
4194 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4197 mutex_lock(&rdev
->mutex
);
4198 if (rdev
->use_count
> 0 || rdev
->constraints
->always_on
) {
4199 if (!_regulator_is_enabled(rdev
)) {
4200 ret
= _regulator_do_enable(rdev
);
4203 "Failed to resume regulator %d\n",
4207 if (!have_full_constraints())
4209 if (!_regulator_is_enabled(rdev
))
4212 ret
= _regulator_do_disable(rdev
);
4214 dev_err(dev
, "Failed to suspend regulator %d\n", ret
);
4217 mutex_unlock(&rdev
->mutex
);
4219 /* Keep processing regulators in spite of any errors */
4224 * regulator_suspend_finish - resume regulators from system wide suspend
4226 * Turn on regulators that might be turned off by regulator_suspend_prepare
4227 * and that should be turned on according to the regulators properties.
4229 int regulator_suspend_finish(void)
4231 return class_for_each_device(®ulator_class
, NULL
, NULL
,
4232 _regulator_suspend_finish
);
4234 EXPORT_SYMBOL_GPL(regulator_suspend_finish
);
4237 * regulator_has_full_constraints - the system has fully specified constraints
4239 * Calling this function will cause the regulator API to disable all
4240 * regulators which have a zero use count and don't have an always_on
4241 * constraint in a late_initcall.
4243 * The intention is that this will become the default behaviour in a
4244 * future kernel release so users are encouraged to use this facility
4247 void regulator_has_full_constraints(void)
4249 has_full_constraints
= 1;
4251 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
4254 * rdev_get_drvdata - get rdev regulator driver data
4257 * Get rdev regulator driver private data. This call can be used in the
4258 * regulator driver context.
4260 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
4262 return rdev
->reg_data
;
4264 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
4267 * regulator_get_drvdata - get regulator driver data
4268 * @regulator: regulator
4270 * Get regulator driver private data. This call can be used in the consumer
4271 * driver context when non API regulator specific functions need to be called.
4273 void *regulator_get_drvdata(struct regulator
*regulator
)
4275 return regulator
->rdev
->reg_data
;
4277 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
4280 * regulator_set_drvdata - set regulator driver data
4281 * @regulator: regulator
4284 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
4286 regulator
->rdev
->reg_data
= data
;
4288 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
4291 * regulator_get_id - get regulator ID
4294 int rdev_get_id(struct regulator_dev
*rdev
)
4296 return rdev
->desc
->id
;
4298 EXPORT_SYMBOL_GPL(rdev_get_id
);
4300 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
4304 EXPORT_SYMBOL_GPL(rdev_get_dev
);
4306 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
4308 return reg_init_data
->driver_data
;
4310 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
4312 #ifdef CONFIG_DEBUG_FS
4313 static ssize_t
supply_map_read_file(struct file
*file
, char __user
*user_buf
,
4314 size_t count
, loff_t
*ppos
)
4316 char *buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
4317 ssize_t len
, ret
= 0;
4318 struct regulator_map
*map
;
4323 list_for_each_entry(map
, ®ulator_map_list
, list
) {
4324 len
= snprintf(buf
+ ret
, PAGE_SIZE
- ret
,
4326 rdev_get_name(map
->regulator
), map
->dev_name
,
4330 if (ret
> PAGE_SIZE
) {
4336 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
4344 static const struct file_operations supply_map_fops
= {
4345 #ifdef CONFIG_DEBUG_FS
4346 .read
= supply_map_read_file
,
4347 .llseek
= default_llseek
,
4351 #ifdef CONFIG_DEBUG_FS
4352 struct summary_data
{
4354 struct regulator_dev
*parent
;
4358 static void regulator_summary_show_subtree(struct seq_file
*s
,
4359 struct regulator_dev
*rdev
,
4362 static int regulator_summary_show_children(struct device
*dev
, void *data
)
4364 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4365 struct summary_data
*summary_data
= data
;
4367 if (rdev
->supply
&& rdev
->supply
->rdev
== summary_data
->parent
)
4368 regulator_summary_show_subtree(summary_data
->s
, rdev
,
4369 summary_data
->level
+ 1);
4374 static void regulator_summary_show_subtree(struct seq_file
*s
,
4375 struct regulator_dev
*rdev
,
4378 struct regulation_constraints
*c
;
4379 struct regulator
*consumer
;
4380 struct summary_data summary_data
;
4385 seq_printf(s
, "%*s%-*s %3d %4d %6d ",
4387 30 - level
* 3, rdev_get_name(rdev
),
4388 rdev
->use_count
, rdev
->open_count
, rdev
->bypass_count
);
4390 seq_printf(s
, "%5dmV ", _regulator_get_voltage(rdev
) / 1000);
4391 seq_printf(s
, "%5dmA ", _regulator_get_current_limit(rdev
) / 1000);
4393 c
= rdev
->constraints
;
4395 switch (rdev
->desc
->type
) {
4396 case REGULATOR_VOLTAGE
:
4397 seq_printf(s
, "%5dmV %5dmV ",
4398 c
->min_uV
/ 1000, c
->max_uV
/ 1000);
4400 case REGULATOR_CURRENT
:
4401 seq_printf(s
, "%5dmA %5dmA ",
4402 c
->min_uA
/ 1000, c
->max_uA
/ 1000);
4409 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
) {
4410 if (consumer
->dev
&& consumer
->dev
->class == ®ulator_class
)
4413 seq_printf(s
, "%*s%-*s ",
4414 (level
+ 1) * 3 + 1, "",
4415 30 - (level
+ 1) * 3,
4416 consumer
->dev
? dev_name(consumer
->dev
) : "deviceless");
4418 switch (rdev
->desc
->type
) {
4419 case REGULATOR_VOLTAGE
:
4420 seq_printf(s
, "%37dmV %5dmV",
4421 consumer
->min_uV
/ 1000,
4422 consumer
->max_uV
/ 1000);
4424 case REGULATOR_CURRENT
:
4432 summary_data
.level
= level
;
4433 summary_data
.parent
= rdev
;
4435 class_for_each_device(®ulator_class
, NULL
, &summary_data
,
4436 regulator_summary_show_children
);
4439 static int regulator_summary_show_roots(struct device
*dev
, void *data
)
4441 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4442 struct seq_file
*s
= data
;
4445 regulator_summary_show_subtree(s
, rdev
, 0);
4450 static int regulator_summary_show(struct seq_file
*s
, void *data
)
4452 seq_puts(s
, " regulator use open bypass voltage current min max\n");
4453 seq_puts(s
, "-------------------------------------------------------------------------------\n");
4455 class_for_each_device(®ulator_class
, NULL
, s
,
4456 regulator_summary_show_roots
);
4461 static int regulator_summary_open(struct inode
*inode
, struct file
*file
)
4463 return single_open(file
, regulator_summary_show
, inode
->i_private
);
4467 static const struct file_operations regulator_summary_fops
= {
4468 #ifdef CONFIG_DEBUG_FS
4469 .open
= regulator_summary_open
,
4471 .llseek
= seq_lseek
,
4472 .release
= single_release
,
4476 static int __init
regulator_init(void)
4480 ret
= class_register(®ulator_class
);
4482 debugfs_root
= debugfs_create_dir("regulator", NULL
);
4484 pr_warn("regulator: Failed to create debugfs directory\n");
4486 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
4489 debugfs_create_file("regulator_summary", 0444, debugfs_root
,
4490 NULL
, ®ulator_summary_fops
);
4492 regulator_dummy_init();
4497 /* init early to allow our consumers to complete system booting */
4498 core_initcall(regulator_init
);
4500 static int __init
regulator_late_cleanup(struct device
*dev
, void *data
)
4502 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4503 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
4504 struct regulation_constraints
*c
= rdev
->constraints
;
4507 if (c
&& c
->always_on
)
4510 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
))
4513 mutex_lock(&rdev
->mutex
);
4515 if (rdev
->use_count
)
4518 /* If we can't read the status assume it's on. */
4519 if (ops
->is_enabled
)
4520 enabled
= ops
->is_enabled(rdev
);
4527 if (have_full_constraints()) {
4528 /* We log since this may kill the system if it goes
4530 rdev_info(rdev
, "disabling\n");
4531 ret
= _regulator_do_disable(rdev
);
4533 rdev_err(rdev
, "couldn't disable: %d\n", ret
);
4535 /* The intention is that in future we will
4536 * assume that full constraints are provided
4537 * so warn even if we aren't going to do
4540 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
4544 mutex_unlock(&rdev
->mutex
);
4549 static int __init
regulator_init_complete(void)
4552 * Since DT doesn't provide an idiomatic mechanism for
4553 * enabling full constraints and since it's much more natural
4554 * with DT to provide them just assume that a DT enabled
4555 * system has full constraints.
4557 if (of_have_populated_dt())
4558 has_full_constraints
= true;
4561 * Regulators may had failed to resolve their input supplies
4562 * when were registered, either because the input supply was
4563 * not registered yet or because its parent device was not
4564 * bound yet. So attempt to resolve the input supplies for
4565 * pending regulators before trying to disable unused ones.
4567 class_for_each_device(®ulator_class
, NULL
, NULL
,
4568 regulator_register_resolve_supply
);
4570 /* If we have a full configuration then disable any regulators
4571 * we have permission to change the status for and which are
4572 * not in use or always_on. This is effectively the default
4573 * for DT and ACPI as they have full constraints.
4575 class_for_each_device(®ulator_class
, NULL
, NULL
,
4576 regulator_late_cleanup
);
4580 late_initcall_sync(regulator_init_complete
);