1 // SPDX-License-Identifier: GPL-2.0-or-later
3 // core.c -- Voltage/Current Regulator framework.
5 // Copyright 2007, 2008 Wolfson Microelectronics PLC.
6 // Copyright 2008 SlimLogic Ltd.
8 // Author: Liam Girdwood <lrg@slimlogic.co.uk>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/debugfs.h>
13 #include <linux/device.h>
14 #include <linux/slab.h>
15 #include <linux/async.h>
16 #include <linux/err.h>
17 #include <linux/mutex.h>
18 #include <linux/suspend.h>
19 #include <linux/delay.h>
20 #include <linux/gpio/consumer.h>
22 #include <linux/regmap.h>
23 #include <linux/regulator/of_regulator.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/regulator/coupler.h>
26 #include <linux/regulator/driver.h>
27 #include <linux/regulator/machine.h>
28 #include <linux/module.h>
30 #define CREATE_TRACE_POINTS
31 #include <trace/events/regulator.h>
36 #define rdev_crit(rdev, fmt, ...) \
37 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
38 #define rdev_err(rdev, fmt, ...) \
39 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
40 #define rdev_warn(rdev, fmt, ...) \
41 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
42 #define rdev_info(rdev, fmt, ...) \
43 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_dbg(rdev, fmt, ...) \
45 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
47 static DEFINE_WW_CLASS(regulator_ww_class
);
48 static DEFINE_MUTEX(regulator_nesting_mutex
);
49 static DEFINE_MUTEX(regulator_list_mutex
);
50 static LIST_HEAD(regulator_map_list
);
51 static LIST_HEAD(regulator_ena_gpio_list
);
52 static LIST_HEAD(regulator_supply_alias_list
);
53 static LIST_HEAD(regulator_coupler_list
);
54 static bool has_full_constraints
;
56 static struct dentry
*debugfs_root
;
59 * struct regulator_map
61 * Used to provide symbolic supply names to devices.
63 struct regulator_map
{
64 struct list_head list
;
65 const char *dev_name
; /* The dev_name() for the consumer */
67 struct regulator_dev
*regulator
;
71 * struct regulator_enable_gpio
73 * Management for shared enable GPIO pin
75 struct regulator_enable_gpio
{
76 struct list_head list
;
77 struct gpio_desc
*gpiod
;
78 u32 enable_count
; /* a number of enabled shared GPIO */
79 u32 request_count
; /* a number of requested shared GPIO */
83 * struct regulator_supply_alias
85 * Used to map lookups for a supply onto an alternative device.
87 struct regulator_supply_alias
{
88 struct list_head list
;
89 struct device
*src_dev
;
90 const char *src_supply
;
91 struct device
*alias_dev
;
92 const char *alias_supply
;
95 static int _regulator_is_enabled(struct regulator_dev
*rdev
);
96 static int _regulator_disable(struct regulator
*regulator
);
97 static int _regulator_get_current_limit(struct regulator_dev
*rdev
);
98 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
);
99 static int _notifier_call_chain(struct regulator_dev
*rdev
,
100 unsigned long event
, void *data
);
101 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
102 int min_uV
, int max_uV
);
103 static int regulator_balance_voltage(struct regulator_dev
*rdev
,
104 suspend_state_t state
);
105 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
107 const char *supply_name
);
108 static void destroy_regulator(struct regulator
*regulator
);
109 static void _regulator_put(struct regulator
*regulator
);
111 const char *rdev_get_name(struct regulator_dev
*rdev
)
113 if (rdev
->constraints
&& rdev
->constraints
->name
)
114 return rdev
->constraints
->name
;
115 else if (rdev
->desc
->name
)
116 return rdev
->desc
->name
;
121 static bool have_full_constraints(void)
123 return has_full_constraints
|| of_have_populated_dt();
126 static bool regulator_ops_is_valid(struct regulator_dev
*rdev
, int ops
)
128 if (!rdev
->constraints
) {
129 rdev_err(rdev
, "no constraints\n");
133 if (rdev
->constraints
->valid_ops_mask
& ops
)
140 * regulator_lock_nested - lock a single regulator
141 * @rdev: regulator source
142 * @ww_ctx: w/w mutex acquire context
144 * This function can be called many times by one task on
145 * a single regulator and its mutex will be locked only
146 * once. If a task, which is calling this function is other
147 * than the one, which initially locked the mutex, it will
150 static inline int regulator_lock_nested(struct regulator_dev
*rdev
,
151 struct ww_acquire_ctx
*ww_ctx
)
156 mutex_lock(®ulator_nesting_mutex
);
158 if (ww_ctx
|| !ww_mutex_trylock(&rdev
->mutex
)) {
159 if (rdev
->mutex_owner
== current
)
165 mutex_unlock(®ulator_nesting_mutex
);
166 ret
= ww_mutex_lock(&rdev
->mutex
, ww_ctx
);
167 mutex_lock(®ulator_nesting_mutex
);
173 if (lock
&& ret
!= -EDEADLK
) {
175 rdev
->mutex_owner
= current
;
178 mutex_unlock(®ulator_nesting_mutex
);
184 * regulator_lock - lock a single regulator
185 * @rdev: regulator source
187 * This function can be called many times by one task on
188 * a single regulator and its mutex will be locked only
189 * once. If a task, which is calling this function is other
190 * than the one, which initially locked the mutex, it will
193 static void regulator_lock(struct regulator_dev
*rdev
)
195 regulator_lock_nested(rdev
, NULL
);
199 * regulator_unlock - unlock a single regulator
200 * @rdev: regulator_source
202 * This function unlocks the mutex when the
203 * reference counter reaches 0.
205 static void regulator_unlock(struct regulator_dev
*rdev
)
207 mutex_lock(®ulator_nesting_mutex
);
209 if (--rdev
->ref_cnt
== 0) {
210 rdev
->mutex_owner
= NULL
;
211 ww_mutex_unlock(&rdev
->mutex
);
214 WARN_ON_ONCE(rdev
->ref_cnt
< 0);
216 mutex_unlock(®ulator_nesting_mutex
);
219 static bool regulator_supply_is_couple(struct regulator_dev
*rdev
)
221 struct regulator_dev
*c_rdev
;
224 for (i
= 1; i
< rdev
->coupling_desc
.n_coupled
; i
++) {
225 c_rdev
= rdev
->coupling_desc
.coupled_rdevs
[i
];
227 if (rdev
->supply
->rdev
== c_rdev
)
234 static void regulator_unlock_recursive(struct regulator_dev
*rdev
,
235 unsigned int n_coupled
)
237 struct regulator_dev
*c_rdev
, *supply_rdev
;
238 int i
, supply_n_coupled
;
240 for (i
= n_coupled
; i
> 0; i
--) {
241 c_rdev
= rdev
->coupling_desc
.coupled_rdevs
[i
- 1];
246 if (c_rdev
->supply
&& !regulator_supply_is_couple(c_rdev
)) {
247 supply_rdev
= c_rdev
->supply
->rdev
;
248 supply_n_coupled
= supply_rdev
->coupling_desc
.n_coupled
;
250 regulator_unlock_recursive(supply_rdev
,
254 regulator_unlock(c_rdev
);
258 static int regulator_lock_recursive(struct regulator_dev
*rdev
,
259 struct regulator_dev
**new_contended_rdev
,
260 struct regulator_dev
**old_contended_rdev
,
261 struct ww_acquire_ctx
*ww_ctx
)
263 struct regulator_dev
*c_rdev
;
266 for (i
= 0; i
< rdev
->coupling_desc
.n_coupled
; i
++) {
267 c_rdev
= rdev
->coupling_desc
.coupled_rdevs
[i
];
272 if (c_rdev
!= *old_contended_rdev
) {
273 err
= regulator_lock_nested(c_rdev
, ww_ctx
);
275 if (err
== -EDEADLK
) {
276 *new_contended_rdev
= c_rdev
;
280 /* shouldn't happen */
281 WARN_ON_ONCE(err
!= -EALREADY
);
284 *old_contended_rdev
= NULL
;
287 if (c_rdev
->supply
&& !regulator_supply_is_couple(c_rdev
)) {
288 err
= regulator_lock_recursive(c_rdev
->supply
->rdev
,
293 regulator_unlock(c_rdev
);
302 regulator_unlock_recursive(rdev
, i
);
308 * regulator_unlock_dependent - unlock regulator's suppliers and coupled
310 * @rdev: regulator source
311 * @ww_ctx: w/w mutex acquire context
313 * Unlock all regulators related with rdev by coupling or supplying.
315 static void regulator_unlock_dependent(struct regulator_dev
*rdev
,
316 struct ww_acquire_ctx
*ww_ctx
)
318 regulator_unlock_recursive(rdev
, rdev
->coupling_desc
.n_coupled
);
319 ww_acquire_fini(ww_ctx
);
323 * regulator_lock_dependent - lock regulator's suppliers and coupled regulators
324 * @rdev: regulator source
325 * @ww_ctx: w/w mutex acquire context
327 * This function as a wrapper on regulator_lock_recursive(), which locks
328 * all regulators related with rdev by coupling or supplying.
330 static void regulator_lock_dependent(struct regulator_dev
*rdev
,
331 struct ww_acquire_ctx
*ww_ctx
)
333 struct regulator_dev
*new_contended_rdev
= NULL
;
334 struct regulator_dev
*old_contended_rdev
= NULL
;
337 mutex_lock(®ulator_list_mutex
);
339 ww_acquire_init(ww_ctx
, ®ulator_ww_class
);
342 if (new_contended_rdev
) {
343 ww_mutex_lock_slow(&new_contended_rdev
->mutex
, ww_ctx
);
344 old_contended_rdev
= new_contended_rdev
;
345 old_contended_rdev
->ref_cnt
++;
348 err
= regulator_lock_recursive(rdev
,
353 if (old_contended_rdev
)
354 regulator_unlock(old_contended_rdev
);
356 } while (err
== -EDEADLK
);
358 ww_acquire_done(ww_ctx
);
360 mutex_unlock(®ulator_list_mutex
);
364 * of_get_child_regulator - get a child regulator device node
365 * based on supply name
366 * @parent: Parent device node
367 * @prop_name: Combination regulator supply name and "-supply"
369 * Traverse all child nodes.
370 * Extract the child regulator device node corresponding to the supply name.
371 * returns the device node corresponding to the regulator if found, else
374 static struct device_node
*of_get_child_regulator(struct device_node
*parent
,
375 const char *prop_name
)
377 struct device_node
*regnode
= NULL
;
378 struct device_node
*child
= NULL
;
380 for_each_child_of_node(parent
, child
) {
381 regnode
= of_parse_phandle(child
, prop_name
, 0);
384 regnode
= of_get_child_regulator(child
, prop_name
);
399 * of_get_regulator - get a regulator device node based on supply name
400 * @dev: Device pointer for the consumer (of regulator) device
401 * @supply: regulator supply name
403 * Extract the regulator device node corresponding to the supply name.
404 * returns the device node corresponding to the regulator if found, else
407 static struct device_node
*of_get_regulator(struct device
*dev
, const char *supply
)
409 struct device_node
*regnode
= NULL
;
410 char prop_name
[64]; /* 64 is max size of property name */
412 dev_dbg(dev
, "Looking up %s-supply from device tree\n", supply
);
414 snprintf(prop_name
, 64, "%s-supply", supply
);
415 regnode
= of_parse_phandle(dev
->of_node
, prop_name
, 0);
418 regnode
= of_get_child_regulator(dev
->of_node
, prop_name
);
422 dev_dbg(dev
, "Looking up %s property in node %pOF failed\n",
423 prop_name
, dev
->of_node
);
429 /* Platform voltage constraint check */
430 int regulator_check_voltage(struct regulator_dev
*rdev
,
431 int *min_uV
, int *max_uV
)
433 BUG_ON(*min_uV
> *max_uV
);
435 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
436 rdev_err(rdev
, "voltage operation not allowed\n");
440 if (*max_uV
> rdev
->constraints
->max_uV
)
441 *max_uV
= rdev
->constraints
->max_uV
;
442 if (*min_uV
< rdev
->constraints
->min_uV
)
443 *min_uV
= rdev
->constraints
->min_uV
;
445 if (*min_uV
> *max_uV
) {
446 rdev_err(rdev
, "unsupportable voltage range: %d-%duV\n",
454 /* return 0 if the state is valid */
455 static int regulator_check_states(suspend_state_t state
)
457 return (state
> PM_SUSPEND_MAX
|| state
== PM_SUSPEND_TO_IDLE
);
460 /* Make sure we select a voltage that suits the needs of all
461 * regulator consumers
463 int regulator_check_consumers(struct regulator_dev
*rdev
,
464 int *min_uV
, int *max_uV
,
465 suspend_state_t state
)
467 struct regulator
*regulator
;
468 struct regulator_voltage
*voltage
;
470 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
471 voltage
= ®ulator
->voltage
[state
];
473 * Assume consumers that didn't say anything are OK
474 * with anything in the constraint range.
476 if (!voltage
->min_uV
&& !voltage
->max_uV
)
479 if (*max_uV
> voltage
->max_uV
)
480 *max_uV
= voltage
->max_uV
;
481 if (*min_uV
< voltage
->min_uV
)
482 *min_uV
= voltage
->min_uV
;
485 if (*min_uV
> *max_uV
) {
486 rdev_err(rdev
, "Restricting voltage, %u-%uuV\n",
494 /* current constraint check */
495 static int regulator_check_current_limit(struct regulator_dev
*rdev
,
496 int *min_uA
, int *max_uA
)
498 BUG_ON(*min_uA
> *max_uA
);
500 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_CURRENT
)) {
501 rdev_err(rdev
, "current operation not allowed\n");
505 if (*max_uA
> rdev
->constraints
->max_uA
)
506 *max_uA
= rdev
->constraints
->max_uA
;
507 if (*min_uA
< rdev
->constraints
->min_uA
)
508 *min_uA
= rdev
->constraints
->min_uA
;
510 if (*min_uA
> *max_uA
) {
511 rdev_err(rdev
, "unsupportable current range: %d-%duA\n",
519 /* operating mode constraint check */
520 static int regulator_mode_constrain(struct regulator_dev
*rdev
,
524 case REGULATOR_MODE_FAST
:
525 case REGULATOR_MODE_NORMAL
:
526 case REGULATOR_MODE_IDLE
:
527 case REGULATOR_MODE_STANDBY
:
530 rdev_err(rdev
, "invalid mode %x specified\n", *mode
);
534 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_MODE
)) {
535 rdev_err(rdev
, "mode operation not allowed\n");
539 /* The modes are bitmasks, the most power hungry modes having
540 * the lowest values. If the requested mode isn't supported
541 * try higher modes. */
543 if (rdev
->constraints
->valid_modes_mask
& *mode
)
551 static inline struct regulator_state
*
552 regulator_get_suspend_state(struct regulator_dev
*rdev
, suspend_state_t state
)
554 if (rdev
->constraints
== NULL
)
558 case PM_SUSPEND_STANDBY
:
559 return &rdev
->constraints
->state_standby
;
561 return &rdev
->constraints
->state_mem
;
563 return &rdev
->constraints
->state_disk
;
569 static const struct regulator_state
*
570 regulator_get_suspend_state_check(struct regulator_dev
*rdev
, suspend_state_t state
)
572 const struct regulator_state
*rstate
;
574 rstate
= regulator_get_suspend_state(rdev
, state
);
578 /* If we have no suspend mode configuration don't set anything;
579 * only warn if the driver implements set_suspend_voltage or
580 * set_suspend_mode callback.
582 if (rstate
->enabled
!= ENABLE_IN_SUSPEND
&&
583 rstate
->enabled
!= DISABLE_IN_SUSPEND
) {
584 if (rdev
->desc
->ops
->set_suspend_voltage
||
585 rdev
->desc
->ops
->set_suspend_mode
)
586 rdev_warn(rdev
, "No configuration\n");
593 static ssize_t
regulator_uV_show(struct device
*dev
,
594 struct device_attribute
*attr
, char *buf
)
596 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
599 regulator_lock(rdev
);
600 uV
= regulator_get_voltage_rdev(rdev
);
601 regulator_unlock(rdev
);
605 return sprintf(buf
, "%d\n", uV
);
607 static DEVICE_ATTR(microvolts
, 0444, regulator_uV_show
, NULL
);
609 static ssize_t
regulator_uA_show(struct device
*dev
,
610 struct device_attribute
*attr
, char *buf
)
612 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
614 return sprintf(buf
, "%d\n", _regulator_get_current_limit(rdev
));
616 static DEVICE_ATTR(microamps
, 0444, regulator_uA_show
, NULL
);
618 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
621 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
623 return sprintf(buf
, "%s\n", rdev_get_name(rdev
));
625 static DEVICE_ATTR_RO(name
);
627 static const char *regulator_opmode_to_str(int mode
)
630 case REGULATOR_MODE_FAST
:
632 case REGULATOR_MODE_NORMAL
:
634 case REGULATOR_MODE_IDLE
:
636 case REGULATOR_MODE_STANDBY
:
642 static ssize_t
regulator_print_opmode(char *buf
, int mode
)
644 return sprintf(buf
, "%s\n", regulator_opmode_to_str(mode
));
647 static ssize_t
regulator_opmode_show(struct device
*dev
,
648 struct device_attribute
*attr
, char *buf
)
650 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
652 return regulator_print_opmode(buf
, _regulator_get_mode(rdev
));
654 static DEVICE_ATTR(opmode
, 0444, regulator_opmode_show
, NULL
);
656 static ssize_t
regulator_print_state(char *buf
, int state
)
659 return sprintf(buf
, "enabled\n");
661 return sprintf(buf
, "disabled\n");
663 return sprintf(buf
, "unknown\n");
666 static ssize_t
regulator_state_show(struct device
*dev
,
667 struct device_attribute
*attr
, char *buf
)
669 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
672 regulator_lock(rdev
);
673 ret
= regulator_print_state(buf
, _regulator_is_enabled(rdev
));
674 regulator_unlock(rdev
);
678 static DEVICE_ATTR(state
, 0444, regulator_state_show
, NULL
);
680 static ssize_t
regulator_status_show(struct device
*dev
,
681 struct device_attribute
*attr
, char *buf
)
683 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
687 status
= rdev
->desc
->ops
->get_status(rdev
);
692 case REGULATOR_STATUS_OFF
:
695 case REGULATOR_STATUS_ON
:
698 case REGULATOR_STATUS_ERROR
:
701 case REGULATOR_STATUS_FAST
:
704 case REGULATOR_STATUS_NORMAL
:
707 case REGULATOR_STATUS_IDLE
:
710 case REGULATOR_STATUS_STANDBY
:
713 case REGULATOR_STATUS_BYPASS
:
716 case REGULATOR_STATUS_UNDEFINED
:
723 return sprintf(buf
, "%s\n", label
);
725 static DEVICE_ATTR(status
, 0444, regulator_status_show
, NULL
);
727 static ssize_t
regulator_min_uA_show(struct device
*dev
,
728 struct device_attribute
*attr
, char *buf
)
730 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
732 if (!rdev
->constraints
)
733 return sprintf(buf
, "constraint not defined\n");
735 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uA
);
737 static DEVICE_ATTR(min_microamps
, 0444, regulator_min_uA_show
, NULL
);
739 static ssize_t
regulator_max_uA_show(struct device
*dev
,
740 struct device_attribute
*attr
, char *buf
)
742 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
744 if (!rdev
->constraints
)
745 return sprintf(buf
, "constraint not defined\n");
747 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uA
);
749 static DEVICE_ATTR(max_microamps
, 0444, regulator_max_uA_show
, NULL
);
751 static ssize_t
regulator_min_uV_show(struct device
*dev
,
752 struct device_attribute
*attr
, char *buf
)
754 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
756 if (!rdev
->constraints
)
757 return sprintf(buf
, "constraint not defined\n");
759 return sprintf(buf
, "%d\n", rdev
->constraints
->min_uV
);
761 static DEVICE_ATTR(min_microvolts
, 0444, regulator_min_uV_show
, NULL
);
763 static ssize_t
regulator_max_uV_show(struct device
*dev
,
764 struct device_attribute
*attr
, char *buf
)
766 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
768 if (!rdev
->constraints
)
769 return sprintf(buf
, "constraint not defined\n");
771 return sprintf(buf
, "%d\n", rdev
->constraints
->max_uV
);
773 static DEVICE_ATTR(max_microvolts
, 0444, regulator_max_uV_show
, NULL
);
775 static ssize_t
regulator_total_uA_show(struct device
*dev
,
776 struct device_attribute
*attr
, char *buf
)
778 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
779 struct regulator
*regulator
;
782 regulator_lock(rdev
);
783 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
784 if (regulator
->enable_count
)
785 uA
+= regulator
->uA_load
;
787 regulator_unlock(rdev
);
788 return sprintf(buf
, "%d\n", uA
);
790 static DEVICE_ATTR(requested_microamps
, 0444, regulator_total_uA_show
, NULL
);
792 static ssize_t
num_users_show(struct device
*dev
, struct device_attribute
*attr
,
795 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
796 return sprintf(buf
, "%d\n", rdev
->use_count
);
798 static DEVICE_ATTR_RO(num_users
);
800 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
803 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
805 switch (rdev
->desc
->type
) {
806 case REGULATOR_VOLTAGE
:
807 return sprintf(buf
, "voltage\n");
808 case REGULATOR_CURRENT
:
809 return sprintf(buf
, "current\n");
811 return sprintf(buf
, "unknown\n");
813 static DEVICE_ATTR_RO(type
);
815 static ssize_t
regulator_suspend_mem_uV_show(struct device
*dev
,
816 struct device_attribute
*attr
, char *buf
)
818 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
820 return sprintf(buf
, "%d\n", rdev
->constraints
->state_mem
.uV
);
822 static DEVICE_ATTR(suspend_mem_microvolts
, 0444,
823 regulator_suspend_mem_uV_show
, NULL
);
825 static ssize_t
regulator_suspend_disk_uV_show(struct device
*dev
,
826 struct device_attribute
*attr
, char *buf
)
828 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
830 return sprintf(buf
, "%d\n", rdev
->constraints
->state_disk
.uV
);
832 static DEVICE_ATTR(suspend_disk_microvolts
, 0444,
833 regulator_suspend_disk_uV_show
, NULL
);
835 static ssize_t
regulator_suspend_standby_uV_show(struct device
*dev
,
836 struct device_attribute
*attr
, char *buf
)
838 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
840 return sprintf(buf
, "%d\n", rdev
->constraints
->state_standby
.uV
);
842 static DEVICE_ATTR(suspend_standby_microvolts
, 0444,
843 regulator_suspend_standby_uV_show
, NULL
);
845 static ssize_t
regulator_suspend_mem_mode_show(struct device
*dev
,
846 struct device_attribute
*attr
, char *buf
)
848 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
850 return regulator_print_opmode(buf
,
851 rdev
->constraints
->state_mem
.mode
);
853 static DEVICE_ATTR(suspend_mem_mode
, 0444,
854 regulator_suspend_mem_mode_show
, NULL
);
856 static ssize_t
regulator_suspend_disk_mode_show(struct device
*dev
,
857 struct device_attribute
*attr
, char *buf
)
859 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
861 return regulator_print_opmode(buf
,
862 rdev
->constraints
->state_disk
.mode
);
864 static DEVICE_ATTR(suspend_disk_mode
, 0444,
865 regulator_suspend_disk_mode_show
, NULL
);
867 static ssize_t
regulator_suspend_standby_mode_show(struct device
*dev
,
868 struct device_attribute
*attr
, char *buf
)
870 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
872 return regulator_print_opmode(buf
,
873 rdev
->constraints
->state_standby
.mode
);
875 static DEVICE_ATTR(suspend_standby_mode
, 0444,
876 regulator_suspend_standby_mode_show
, NULL
);
878 static ssize_t
regulator_suspend_mem_state_show(struct device
*dev
,
879 struct device_attribute
*attr
, char *buf
)
881 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
883 return regulator_print_state(buf
,
884 rdev
->constraints
->state_mem
.enabled
);
886 static DEVICE_ATTR(suspend_mem_state
, 0444,
887 regulator_suspend_mem_state_show
, NULL
);
889 static ssize_t
regulator_suspend_disk_state_show(struct device
*dev
,
890 struct device_attribute
*attr
, char *buf
)
892 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
894 return regulator_print_state(buf
,
895 rdev
->constraints
->state_disk
.enabled
);
897 static DEVICE_ATTR(suspend_disk_state
, 0444,
898 regulator_suspend_disk_state_show
, NULL
);
900 static ssize_t
regulator_suspend_standby_state_show(struct device
*dev
,
901 struct device_attribute
*attr
, char *buf
)
903 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
905 return regulator_print_state(buf
,
906 rdev
->constraints
->state_standby
.enabled
);
908 static DEVICE_ATTR(suspend_standby_state
, 0444,
909 regulator_suspend_standby_state_show
, NULL
);
911 static ssize_t
regulator_bypass_show(struct device
*dev
,
912 struct device_attribute
*attr
, char *buf
)
914 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
919 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypass
);
928 return sprintf(buf
, "%s\n", report
);
930 static DEVICE_ATTR(bypass
, 0444,
931 regulator_bypass_show
, NULL
);
933 /* Calculate the new optimum regulator operating mode based on the new total
934 * consumer load. All locks held by caller */
935 static int drms_uA_update(struct regulator_dev
*rdev
)
937 struct regulator
*sibling
;
938 int current_uA
= 0, output_uV
, input_uV
, err
;
942 * first check to see if we can set modes at all, otherwise just
943 * tell the consumer everything is OK.
945 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_DRMS
)) {
946 rdev_dbg(rdev
, "DRMS operation not allowed\n");
950 if (!rdev
->desc
->ops
->get_optimum_mode
&&
951 !rdev
->desc
->ops
->set_load
)
954 if (!rdev
->desc
->ops
->set_mode
&&
955 !rdev
->desc
->ops
->set_load
)
958 /* calc total requested load */
959 list_for_each_entry(sibling
, &rdev
->consumer_list
, list
) {
960 if (sibling
->enable_count
)
961 current_uA
+= sibling
->uA_load
;
964 current_uA
+= rdev
->constraints
->system_load
;
966 if (rdev
->desc
->ops
->set_load
) {
967 /* set the optimum mode for our new total regulator load */
968 err
= rdev
->desc
->ops
->set_load(rdev
, current_uA
);
970 rdev_err(rdev
, "failed to set load %d: %pe\n",
971 current_uA
, ERR_PTR(err
));
973 /* get output voltage */
974 output_uV
= regulator_get_voltage_rdev(rdev
);
975 if (output_uV
<= 0) {
976 rdev_err(rdev
, "invalid output voltage found\n");
980 /* get input voltage */
983 input_uV
= regulator_get_voltage(rdev
->supply
);
985 input_uV
= rdev
->constraints
->input_uV
;
987 rdev_err(rdev
, "invalid input voltage found\n");
991 /* now get the optimum mode for our new total regulator load */
992 mode
= rdev
->desc
->ops
->get_optimum_mode(rdev
, input_uV
,
993 output_uV
, current_uA
);
995 /* check the new mode is allowed */
996 err
= regulator_mode_constrain(rdev
, &mode
);
998 rdev_err(rdev
, "failed to get optimum mode @ %d uA %d -> %d uV: %pe\n",
999 current_uA
, input_uV
, output_uV
, ERR_PTR(err
));
1003 err
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
1005 rdev_err(rdev
, "failed to set optimum mode %x: %pe\n",
1006 mode
, ERR_PTR(err
));
1012 static int __suspend_set_state(struct regulator_dev
*rdev
,
1013 const struct regulator_state
*rstate
)
1017 if (rstate
->enabled
== ENABLE_IN_SUSPEND
&&
1018 rdev
->desc
->ops
->set_suspend_enable
)
1019 ret
= rdev
->desc
->ops
->set_suspend_enable(rdev
);
1020 else if (rstate
->enabled
== DISABLE_IN_SUSPEND
&&
1021 rdev
->desc
->ops
->set_suspend_disable
)
1022 ret
= rdev
->desc
->ops
->set_suspend_disable(rdev
);
1023 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
1027 rdev_err(rdev
, "failed to enabled/disable: %pe\n", ERR_PTR(ret
));
1031 if (rdev
->desc
->ops
->set_suspend_voltage
&& rstate
->uV
> 0) {
1032 ret
= rdev
->desc
->ops
->set_suspend_voltage(rdev
, rstate
->uV
);
1034 rdev_err(rdev
, "failed to set voltage: %pe\n", ERR_PTR(ret
));
1039 if (rdev
->desc
->ops
->set_suspend_mode
&& rstate
->mode
> 0) {
1040 ret
= rdev
->desc
->ops
->set_suspend_mode(rdev
, rstate
->mode
);
1042 rdev_err(rdev
, "failed to set mode: %pe\n", ERR_PTR(ret
));
1050 static int suspend_set_initial_state(struct regulator_dev
*rdev
)
1052 const struct regulator_state
*rstate
;
1054 rstate
= regulator_get_suspend_state_check(rdev
,
1055 rdev
->constraints
->initial_state
);
1059 return __suspend_set_state(rdev
, rstate
);
1062 #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
1063 static void print_constraints_debug(struct regulator_dev
*rdev
)
1065 struct regulation_constraints
*constraints
= rdev
->constraints
;
1067 size_t len
= sizeof(buf
) - 1;
1071 if (constraints
->min_uV
&& constraints
->max_uV
) {
1072 if (constraints
->min_uV
== constraints
->max_uV
)
1073 count
+= scnprintf(buf
+ count
, len
- count
, "%d mV ",
1074 constraints
->min_uV
/ 1000);
1076 count
+= scnprintf(buf
+ count
, len
- count
,
1078 constraints
->min_uV
/ 1000,
1079 constraints
->max_uV
/ 1000);
1082 if (!constraints
->min_uV
||
1083 constraints
->min_uV
!= constraints
->max_uV
) {
1084 ret
= regulator_get_voltage_rdev(rdev
);
1086 count
+= scnprintf(buf
+ count
, len
- count
,
1087 "at %d mV ", ret
/ 1000);
1090 if (constraints
->uV_offset
)
1091 count
+= scnprintf(buf
+ count
, len
- count
, "%dmV offset ",
1092 constraints
->uV_offset
/ 1000);
1094 if (constraints
->min_uA
&& constraints
->max_uA
) {
1095 if (constraints
->min_uA
== constraints
->max_uA
)
1096 count
+= scnprintf(buf
+ count
, len
- count
, "%d mA ",
1097 constraints
->min_uA
/ 1000);
1099 count
+= scnprintf(buf
+ count
, len
- count
,
1101 constraints
->min_uA
/ 1000,
1102 constraints
->max_uA
/ 1000);
1105 if (!constraints
->min_uA
||
1106 constraints
->min_uA
!= constraints
->max_uA
) {
1107 ret
= _regulator_get_current_limit(rdev
);
1109 count
+= scnprintf(buf
+ count
, len
- count
,
1110 "at %d mA ", ret
/ 1000);
1113 if (constraints
->valid_modes_mask
& REGULATOR_MODE_FAST
)
1114 count
+= scnprintf(buf
+ count
, len
- count
, "fast ");
1115 if (constraints
->valid_modes_mask
& REGULATOR_MODE_NORMAL
)
1116 count
+= scnprintf(buf
+ count
, len
- count
, "normal ");
1117 if (constraints
->valid_modes_mask
& REGULATOR_MODE_IDLE
)
1118 count
+= scnprintf(buf
+ count
, len
- count
, "idle ");
1119 if (constraints
->valid_modes_mask
& REGULATOR_MODE_STANDBY
)
1120 count
+= scnprintf(buf
+ count
, len
- count
, "standby ");
1123 count
= scnprintf(buf
, len
, "no parameters");
1127 count
+= scnprintf(buf
+ count
, len
- count
, ", %s",
1128 _regulator_is_enabled(rdev
) ? "enabled" : "disabled");
1130 rdev_dbg(rdev
, "%s\n", buf
);
1132 #else /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */
1133 static inline void print_constraints_debug(struct regulator_dev
*rdev
) {}
1134 #endif /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */
1136 static void print_constraints(struct regulator_dev
*rdev
)
1138 struct regulation_constraints
*constraints
= rdev
->constraints
;
1140 print_constraints_debug(rdev
);
1142 if ((constraints
->min_uV
!= constraints
->max_uV
) &&
1143 !regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
))
1145 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
1148 static int machine_constraints_voltage(struct regulator_dev
*rdev
,
1149 struct regulation_constraints
*constraints
)
1151 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1154 /* do we need to apply the constraint voltage */
1155 if (rdev
->constraints
->apply_uV
&&
1156 rdev
->constraints
->min_uV
&& rdev
->constraints
->max_uV
) {
1157 int target_min
, target_max
;
1158 int current_uV
= regulator_get_voltage_rdev(rdev
);
1160 if (current_uV
== -ENOTRECOVERABLE
) {
1161 /* This regulator can't be read and must be initialized */
1162 rdev_info(rdev
, "Setting %d-%duV\n",
1163 rdev
->constraints
->min_uV
,
1164 rdev
->constraints
->max_uV
);
1165 _regulator_do_set_voltage(rdev
,
1166 rdev
->constraints
->min_uV
,
1167 rdev
->constraints
->max_uV
);
1168 current_uV
= regulator_get_voltage_rdev(rdev
);
1171 if (current_uV
< 0) {
1173 "failed to get the current voltage: %pe\n",
1174 ERR_PTR(current_uV
));
1179 * If we're below the minimum voltage move up to the
1180 * minimum voltage, if we're above the maximum voltage
1181 * then move down to the maximum.
1183 target_min
= current_uV
;
1184 target_max
= current_uV
;
1186 if (current_uV
< rdev
->constraints
->min_uV
) {
1187 target_min
= rdev
->constraints
->min_uV
;
1188 target_max
= rdev
->constraints
->min_uV
;
1191 if (current_uV
> rdev
->constraints
->max_uV
) {
1192 target_min
= rdev
->constraints
->max_uV
;
1193 target_max
= rdev
->constraints
->max_uV
;
1196 if (target_min
!= current_uV
|| target_max
!= current_uV
) {
1197 rdev_info(rdev
, "Bringing %duV into %d-%duV\n",
1198 current_uV
, target_min
, target_max
);
1199 ret
= _regulator_do_set_voltage(
1200 rdev
, target_min
, target_max
);
1203 "failed to apply %d-%duV constraint: %pe\n",
1204 target_min
, target_max
, ERR_PTR(ret
));
1210 /* constrain machine-level voltage specs to fit
1211 * the actual range supported by this regulator.
1213 if (ops
->list_voltage
&& rdev
->desc
->n_voltages
) {
1214 int count
= rdev
->desc
->n_voltages
;
1216 int min_uV
= INT_MAX
;
1217 int max_uV
= INT_MIN
;
1218 int cmin
= constraints
->min_uV
;
1219 int cmax
= constraints
->max_uV
;
1221 /* it's safe to autoconfigure fixed-voltage supplies
1222 and the constraints are used by list_voltage. */
1223 if (count
== 1 && !cmin
) {
1226 constraints
->min_uV
= cmin
;
1227 constraints
->max_uV
= cmax
;
1230 /* voltage constraints are optional */
1231 if ((cmin
== 0) && (cmax
== 0))
1234 /* else require explicit machine-level constraints */
1235 if (cmin
<= 0 || cmax
<= 0 || cmax
< cmin
) {
1236 rdev_err(rdev
, "invalid voltage constraints\n");
1240 /* no need to loop voltages if range is continuous */
1241 if (rdev
->desc
->continuous_voltage_range
)
1244 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
1245 for (i
= 0; i
< count
; i
++) {
1248 value
= ops
->list_voltage(rdev
, i
);
1252 /* maybe adjust [min_uV..max_uV] */
1253 if (value
>= cmin
&& value
< min_uV
)
1255 if (value
<= cmax
&& value
> max_uV
)
1259 /* final: [min_uV..max_uV] valid iff constraints valid */
1260 if (max_uV
< min_uV
) {
1262 "unsupportable voltage constraints %u-%uuV\n",
1267 /* use regulator's subset of machine constraints */
1268 if (constraints
->min_uV
< min_uV
) {
1269 rdev_dbg(rdev
, "override min_uV, %d -> %d\n",
1270 constraints
->min_uV
, min_uV
);
1271 constraints
->min_uV
= min_uV
;
1273 if (constraints
->max_uV
> max_uV
) {
1274 rdev_dbg(rdev
, "override max_uV, %d -> %d\n",
1275 constraints
->max_uV
, max_uV
);
1276 constraints
->max_uV
= max_uV
;
1283 static int machine_constraints_current(struct regulator_dev
*rdev
,
1284 struct regulation_constraints
*constraints
)
1286 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1289 if (!constraints
->min_uA
&& !constraints
->max_uA
)
1292 if (constraints
->min_uA
> constraints
->max_uA
) {
1293 rdev_err(rdev
, "Invalid current constraints\n");
1297 if (!ops
->set_current_limit
|| !ops
->get_current_limit
) {
1298 rdev_warn(rdev
, "Operation of current configuration missing\n");
1302 /* Set regulator current in constraints range */
1303 ret
= ops
->set_current_limit(rdev
, constraints
->min_uA
,
1304 constraints
->max_uA
);
1306 rdev_err(rdev
, "Failed to set current constraint, %d\n", ret
);
1313 static int _regulator_do_enable(struct regulator_dev
*rdev
);
1316 * set_machine_constraints - sets regulator constraints
1317 * @rdev: regulator source
1319 * Allows platform initialisation code to define and constrain
1320 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1321 * Constraints *must* be set by platform code in order for some
1322 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1325 static int set_machine_constraints(struct regulator_dev
*rdev
)
1328 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
1330 ret
= machine_constraints_voltage(rdev
, rdev
->constraints
);
1334 ret
= machine_constraints_current(rdev
, rdev
->constraints
);
1338 if (rdev
->constraints
->ilim_uA
&& ops
->set_input_current_limit
) {
1339 ret
= ops
->set_input_current_limit(rdev
,
1340 rdev
->constraints
->ilim_uA
);
1342 rdev_err(rdev
, "failed to set input limit: %pe\n", ERR_PTR(ret
));
1347 /* do we need to setup our suspend state */
1348 if (rdev
->constraints
->initial_state
) {
1349 ret
= suspend_set_initial_state(rdev
);
1351 rdev_err(rdev
, "failed to set suspend state: %pe\n", ERR_PTR(ret
));
1356 if (rdev
->constraints
->initial_mode
) {
1357 if (!ops
->set_mode
) {
1358 rdev_err(rdev
, "no set_mode operation\n");
1362 ret
= ops
->set_mode(rdev
, rdev
->constraints
->initial_mode
);
1364 rdev_err(rdev
, "failed to set initial mode: %pe\n", ERR_PTR(ret
));
1367 } else if (rdev
->constraints
->system_load
) {
1369 * We'll only apply the initial system load if an
1370 * initial mode wasn't specified.
1372 drms_uA_update(rdev
);
1375 if ((rdev
->constraints
->ramp_delay
|| rdev
->constraints
->ramp_disable
)
1376 && ops
->set_ramp_delay
) {
1377 ret
= ops
->set_ramp_delay(rdev
, rdev
->constraints
->ramp_delay
);
1379 rdev_err(rdev
, "failed to set ramp_delay: %pe\n", ERR_PTR(ret
));
1384 if (rdev
->constraints
->pull_down
&& ops
->set_pull_down
) {
1385 ret
= ops
->set_pull_down(rdev
);
1387 rdev_err(rdev
, "failed to set pull down: %pe\n", ERR_PTR(ret
));
1392 if (rdev
->constraints
->soft_start
&& ops
->set_soft_start
) {
1393 ret
= ops
->set_soft_start(rdev
);
1395 rdev_err(rdev
, "failed to set soft start: %pe\n", ERR_PTR(ret
));
1400 if (rdev
->constraints
->over_current_protection
1401 && ops
->set_over_current_protection
) {
1402 ret
= ops
->set_over_current_protection(rdev
);
1404 rdev_err(rdev
, "failed to set over current protection: %pe\n",
1410 if (rdev
->constraints
->active_discharge
&& ops
->set_active_discharge
) {
1411 bool ad_state
= (rdev
->constraints
->active_discharge
==
1412 REGULATOR_ACTIVE_DISCHARGE_ENABLE
) ? true : false;
1414 ret
= ops
->set_active_discharge(rdev
, ad_state
);
1416 rdev_err(rdev
, "failed to set active discharge: %pe\n", ERR_PTR(ret
));
1421 /* If the constraints say the regulator should be on at this point
1422 * and we have control then make sure it is enabled.
1424 if (rdev
->constraints
->always_on
|| rdev
->constraints
->boot_on
) {
1426 ret
= regulator_enable(rdev
->supply
);
1428 _regulator_put(rdev
->supply
);
1429 rdev
->supply
= NULL
;
1434 ret
= _regulator_do_enable(rdev
);
1435 if (ret
< 0 && ret
!= -EINVAL
) {
1436 rdev_err(rdev
, "failed to enable: %pe\n", ERR_PTR(ret
));
1440 if (rdev
->constraints
->always_on
)
1444 print_constraints(rdev
);
1449 * set_supply - set regulator supply regulator
1450 * @rdev: regulator name
1451 * @supply_rdev: supply regulator name
1453 * Called by platform initialisation code to set the supply regulator for this
1454 * regulator. This ensures that a regulators supply will also be enabled by the
1455 * core if it's child is enabled.
1457 static int set_supply(struct regulator_dev
*rdev
,
1458 struct regulator_dev
*supply_rdev
)
1462 rdev_info(rdev
, "supplied by %s\n", rdev_get_name(supply_rdev
));
1464 if (!try_module_get(supply_rdev
->owner
))
1467 rdev
->supply
= create_regulator(supply_rdev
, &rdev
->dev
, "SUPPLY");
1468 if (rdev
->supply
== NULL
) {
1472 supply_rdev
->open_count
++;
1478 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1479 * @rdev: regulator source
1480 * @consumer_dev_name: dev_name() string for device supply applies to
1481 * @supply: symbolic name for supply
1483 * Allows platform initialisation code to map physical regulator
1484 * sources to symbolic names for supplies for use by devices. Devices
1485 * should use these symbolic names to request regulators, avoiding the
1486 * need to provide board-specific regulator names as platform data.
1488 static int set_consumer_device_supply(struct regulator_dev
*rdev
,
1489 const char *consumer_dev_name
,
1492 struct regulator_map
*node
, *new_node
;
1498 if (consumer_dev_name
!= NULL
)
1503 new_node
= kzalloc(sizeof(struct regulator_map
), GFP_KERNEL
);
1504 if (new_node
== NULL
)
1507 new_node
->regulator
= rdev
;
1508 new_node
->supply
= supply
;
1511 new_node
->dev_name
= kstrdup(consumer_dev_name
, GFP_KERNEL
);
1512 if (new_node
->dev_name
== NULL
) {
1518 mutex_lock(®ulator_list_mutex
);
1519 list_for_each_entry(node
, ®ulator_map_list
, list
) {
1520 if (node
->dev_name
&& consumer_dev_name
) {
1521 if (strcmp(node
->dev_name
, consumer_dev_name
) != 0)
1523 } else if (node
->dev_name
|| consumer_dev_name
) {
1527 if (strcmp(node
->supply
, supply
) != 0)
1530 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1532 dev_name(&node
->regulator
->dev
),
1533 node
->regulator
->desc
->name
,
1535 dev_name(&rdev
->dev
), rdev_get_name(rdev
));
1539 list_add(&new_node
->list
, ®ulator_map_list
);
1540 mutex_unlock(®ulator_list_mutex
);
1545 mutex_unlock(®ulator_list_mutex
);
1546 kfree(new_node
->dev_name
);
1551 static void unset_regulator_supplies(struct regulator_dev
*rdev
)
1553 struct regulator_map
*node
, *n
;
1555 list_for_each_entry_safe(node
, n
, ®ulator_map_list
, list
) {
1556 if (rdev
== node
->regulator
) {
1557 list_del(&node
->list
);
1558 kfree(node
->dev_name
);
1564 #ifdef CONFIG_DEBUG_FS
1565 static ssize_t
constraint_flags_read_file(struct file
*file
,
1566 char __user
*user_buf
,
1567 size_t count
, loff_t
*ppos
)
1569 const struct regulator
*regulator
= file
->private_data
;
1570 const struct regulation_constraints
*c
= regulator
->rdev
->constraints
;
1577 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
1581 ret
= snprintf(buf
, PAGE_SIZE
,
1585 "ramp_disable: %u\n"
1588 "over_current_protection: %u\n",
1595 c
->over_current_protection
);
1597 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buf
, ret
);
1605 static const struct file_operations constraint_flags_fops
= {
1606 #ifdef CONFIG_DEBUG_FS
1607 .open
= simple_open
,
1608 .read
= constraint_flags_read_file
,
1609 .llseek
= default_llseek
,
1613 #define REG_STR_SIZE 64
1615 static struct regulator
*create_regulator(struct regulator_dev
*rdev
,
1617 const char *supply_name
)
1619 struct regulator
*regulator
;
1623 char buf
[REG_STR_SIZE
];
1626 size
= snprintf(buf
, REG_STR_SIZE
, "%s-%s",
1627 dev
->kobj
.name
, supply_name
);
1628 if (size
>= REG_STR_SIZE
)
1631 supply_name
= kstrdup(buf
, GFP_KERNEL
);
1632 if (supply_name
== NULL
)
1635 supply_name
= kstrdup_const(supply_name
, GFP_KERNEL
);
1636 if (supply_name
== NULL
)
1640 regulator
= kzalloc(sizeof(*regulator
), GFP_KERNEL
);
1641 if (regulator
== NULL
) {
1646 regulator
->rdev
= rdev
;
1647 regulator
->supply_name
= supply_name
;
1649 regulator_lock(rdev
);
1650 list_add(®ulator
->list
, &rdev
->consumer_list
);
1651 regulator_unlock(rdev
);
1654 regulator
->dev
= dev
;
1656 /* Add a link to the device sysfs entry */
1657 err
= sysfs_create_link_nowarn(&rdev
->dev
.kobj
, &dev
->kobj
,
1660 rdev_dbg(rdev
, "could not add device link %s: %pe\n",
1661 dev
->kobj
.name
, ERR_PTR(err
));
1666 regulator
->debugfs
= debugfs_create_dir(supply_name
,
1668 if (!regulator
->debugfs
) {
1669 rdev_dbg(rdev
, "Failed to create debugfs directory\n");
1671 debugfs_create_u32("uA_load", 0444, regulator
->debugfs
,
1672 ®ulator
->uA_load
);
1673 debugfs_create_u32("min_uV", 0444, regulator
->debugfs
,
1674 ®ulator
->voltage
[PM_SUSPEND_ON
].min_uV
);
1675 debugfs_create_u32("max_uV", 0444, regulator
->debugfs
,
1676 ®ulator
->voltage
[PM_SUSPEND_ON
].max_uV
);
1677 debugfs_create_file("constraint_flags", 0444,
1678 regulator
->debugfs
, regulator
,
1679 &constraint_flags_fops
);
1683 * Check now if the regulator is an always on regulator - if
1684 * it is then we don't need to do nearly so much work for
1685 * enable/disable calls.
1687 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
) &&
1688 _regulator_is_enabled(rdev
))
1689 regulator
->always_on
= true;
1694 static int _regulator_get_enable_time(struct regulator_dev
*rdev
)
1696 if (rdev
->constraints
&& rdev
->constraints
->enable_time
)
1697 return rdev
->constraints
->enable_time
;
1698 if (rdev
->desc
->ops
->enable_time
)
1699 return rdev
->desc
->ops
->enable_time(rdev
);
1700 return rdev
->desc
->enable_time
;
1703 static struct regulator_supply_alias
*regulator_find_supply_alias(
1704 struct device
*dev
, const char *supply
)
1706 struct regulator_supply_alias
*map
;
1708 list_for_each_entry(map
, ®ulator_supply_alias_list
, list
)
1709 if (map
->src_dev
== dev
&& strcmp(map
->src_supply
, supply
) == 0)
1715 static void regulator_supply_alias(struct device
**dev
, const char **supply
)
1717 struct regulator_supply_alias
*map
;
1719 map
= regulator_find_supply_alias(*dev
, *supply
);
1721 dev_dbg(*dev
, "Mapping supply %s to %s,%s\n",
1722 *supply
, map
->alias_supply
,
1723 dev_name(map
->alias_dev
));
1724 *dev
= map
->alias_dev
;
1725 *supply
= map
->alias_supply
;
1729 static int regulator_match(struct device
*dev
, const void *data
)
1731 struct regulator_dev
*r
= dev_to_rdev(dev
);
1733 return strcmp(rdev_get_name(r
), data
) == 0;
1736 static struct regulator_dev
*regulator_lookup_by_name(const char *name
)
1740 dev
= class_find_device(®ulator_class
, NULL
, name
, regulator_match
);
1742 return dev
? dev_to_rdev(dev
) : NULL
;
1746 * regulator_dev_lookup - lookup a regulator device.
1747 * @dev: device for regulator "consumer".
1748 * @supply: Supply name or regulator ID.
1750 * If successful, returns a struct regulator_dev that corresponds to the name
1751 * @supply and with the embedded struct device refcount incremented by one.
1752 * The refcount must be dropped by calling put_device().
1753 * On failure one of the following ERR-PTR-encoded values is returned:
1754 * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
1757 static struct regulator_dev
*regulator_dev_lookup(struct device
*dev
,
1760 struct regulator_dev
*r
= NULL
;
1761 struct device_node
*node
;
1762 struct regulator_map
*map
;
1763 const char *devname
= NULL
;
1765 regulator_supply_alias(&dev
, &supply
);
1767 /* first do a dt based lookup */
1768 if (dev
&& dev
->of_node
) {
1769 node
= of_get_regulator(dev
, supply
);
1771 r
= of_find_regulator_by_node(node
);
1776 * We have a node, but there is no device.
1777 * assume it has not registered yet.
1779 return ERR_PTR(-EPROBE_DEFER
);
1783 /* if not found, try doing it non-dt way */
1785 devname
= dev_name(dev
);
1787 mutex_lock(®ulator_list_mutex
);
1788 list_for_each_entry(map
, ®ulator_map_list
, list
) {
1789 /* If the mapping has a device set up it must match */
1790 if (map
->dev_name
&&
1791 (!devname
|| strcmp(map
->dev_name
, devname
)))
1794 if (strcmp(map
->supply
, supply
) == 0 &&
1795 get_device(&map
->regulator
->dev
)) {
1800 mutex_unlock(®ulator_list_mutex
);
1805 r
= regulator_lookup_by_name(supply
);
1809 return ERR_PTR(-ENODEV
);
1812 static int regulator_resolve_supply(struct regulator_dev
*rdev
)
1814 struct regulator_dev
*r
;
1815 struct device
*dev
= rdev
->dev
.parent
;
1818 /* No supply to resolve? */
1819 if (!rdev
->supply_name
)
1822 /* Supply already resolved? (fast-path without locking contention) */
1826 r
= regulator_dev_lookup(dev
, rdev
->supply_name
);
1830 /* Did the lookup explicitly defer for us? */
1831 if (ret
== -EPROBE_DEFER
)
1834 if (have_full_constraints()) {
1835 r
= dummy_regulator_rdev
;
1836 get_device(&r
->dev
);
1838 dev_err(dev
, "Failed to resolve %s-supply for %s\n",
1839 rdev
->supply_name
, rdev
->desc
->name
);
1840 ret
= -EPROBE_DEFER
;
1846 dev_err(dev
, "Supply for %s (%s) resolved to itself\n",
1847 rdev
->desc
->name
, rdev
->supply_name
);
1848 if (!have_full_constraints()) {
1852 r
= dummy_regulator_rdev
;
1853 get_device(&r
->dev
);
1857 * If the supply's parent device is not the same as the
1858 * regulator's parent device, then ensure the parent device
1859 * is bound before we resolve the supply, in case the parent
1860 * device get probe deferred and unregisters the supply.
1862 if (r
->dev
.parent
&& r
->dev
.parent
!= rdev
->dev
.parent
) {
1863 if (!device_is_bound(r
->dev
.parent
)) {
1864 put_device(&r
->dev
);
1865 ret
= -EPROBE_DEFER
;
1870 /* Recursively resolve the supply of the supply */
1871 ret
= regulator_resolve_supply(r
);
1873 put_device(&r
->dev
);
1878 * Recheck rdev->supply with rdev->mutex lock held to avoid a race
1879 * between rdev->supply null check and setting rdev->supply in
1880 * set_supply() from concurrent tasks.
1882 regulator_lock(rdev
);
1884 /* Supply just resolved by a concurrent task? */
1886 regulator_unlock(rdev
);
1887 put_device(&r
->dev
);
1891 ret
= set_supply(rdev
, r
);
1893 regulator_unlock(rdev
);
1894 put_device(&r
->dev
);
1898 regulator_unlock(rdev
);
1901 * In set_machine_constraints() we may have turned this regulator on
1902 * but we couldn't propagate to the supply if it hadn't been resolved
1905 if (rdev
->use_count
) {
1906 ret
= regulator_enable(rdev
->supply
);
1908 _regulator_put(rdev
->supply
);
1909 rdev
->supply
= NULL
;
1918 /* Internal regulator request function */
1919 struct regulator
*_regulator_get(struct device
*dev
, const char *id
,
1920 enum regulator_get_type get_type
)
1922 struct regulator_dev
*rdev
;
1923 struct regulator
*regulator
;
1924 struct device_link
*link
;
1927 if (get_type
>= MAX_GET_TYPE
) {
1928 dev_err(dev
, "invalid type %d in %s\n", get_type
, __func__
);
1929 return ERR_PTR(-EINVAL
);
1933 pr_err("get() with no identifier\n");
1934 return ERR_PTR(-EINVAL
);
1937 rdev
= regulator_dev_lookup(dev
, id
);
1939 ret
= PTR_ERR(rdev
);
1942 * If regulator_dev_lookup() fails with error other
1943 * than -ENODEV our job here is done, we simply return it.
1946 return ERR_PTR(ret
);
1948 if (!have_full_constraints()) {
1950 "incomplete constraints, dummy supplies not allowed\n");
1951 return ERR_PTR(-ENODEV
);
1957 * Assume that a regulator is physically present and
1958 * enabled, even if it isn't hooked up, and just
1961 dev_warn(dev
, "supply %s not found, using dummy regulator\n", id
);
1962 rdev
= dummy_regulator_rdev
;
1963 get_device(&rdev
->dev
);
1968 "dummy supplies not allowed for exclusive requests\n");
1972 return ERR_PTR(-ENODEV
);
1976 if (rdev
->exclusive
) {
1977 regulator
= ERR_PTR(-EPERM
);
1978 put_device(&rdev
->dev
);
1982 if (get_type
== EXCLUSIVE_GET
&& rdev
->open_count
) {
1983 regulator
= ERR_PTR(-EBUSY
);
1984 put_device(&rdev
->dev
);
1988 mutex_lock(®ulator_list_mutex
);
1989 ret
= (rdev
->coupling_desc
.n_resolved
!= rdev
->coupling_desc
.n_coupled
);
1990 mutex_unlock(®ulator_list_mutex
);
1993 regulator
= ERR_PTR(-EPROBE_DEFER
);
1994 put_device(&rdev
->dev
);
1998 ret
= regulator_resolve_supply(rdev
);
2000 regulator
= ERR_PTR(ret
);
2001 put_device(&rdev
->dev
);
2005 if (!try_module_get(rdev
->owner
)) {
2006 regulator
= ERR_PTR(-EPROBE_DEFER
);
2007 put_device(&rdev
->dev
);
2011 regulator
= create_regulator(rdev
, dev
, id
);
2012 if (regulator
== NULL
) {
2013 regulator
= ERR_PTR(-ENOMEM
);
2014 module_put(rdev
->owner
);
2015 put_device(&rdev
->dev
);
2020 if (get_type
== EXCLUSIVE_GET
) {
2021 rdev
->exclusive
= 1;
2023 ret
= _regulator_is_enabled(rdev
);
2025 rdev
->use_count
= 1;
2027 rdev
->use_count
= 0;
2030 link
= device_link_add(dev
, &rdev
->dev
, DL_FLAG_STATELESS
);
2031 if (!IS_ERR_OR_NULL(link
))
2032 regulator
->device_link
= true;
2038 * regulator_get - lookup and obtain a reference to a regulator.
2039 * @dev: device for regulator "consumer"
2040 * @id: Supply name or regulator ID.
2042 * Returns a struct regulator corresponding to the regulator producer,
2043 * or IS_ERR() condition containing errno.
2045 * Use of supply names configured via regulator_set_device_supply() is
2046 * strongly encouraged. It is recommended that the supply name used
2047 * should match the name used for the supply and/or the relevant
2048 * device pins in the datasheet.
2050 struct regulator
*regulator_get(struct device
*dev
, const char *id
)
2052 return _regulator_get(dev
, id
, NORMAL_GET
);
2054 EXPORT_SYMBOL_GPL(regulator_get
);
2057 * regulator_get_exclusive - obtain exclusive access to a regulator.
2058 * @dev: device for regulator "consumer"
2059 * @id: Supply name or regulator ID.
2061 * Returns a struct regulator corresponding to the regulator producer,
2062 * or IS_ERR() condition containing errno. Other consumers will be
2063 * unable to obtain this regulator while this reference is held and the
2064 * use count for the regulator will be initialised to reflect the current
2065 * state of the regulator.
2067 * This is intended for use by consumers which cannot tolerate shared
2068 * use of the regulator such as those which need to force the
2069 * regulator off for correct operation of the hardware they are
2072 * Use of supply names configured via regulator_set_device_supply() is
2073 * strongly encouraged. It is recommended that the supply name used
2074 * should match the name used for the supply and/or the relevant
2075 * device pins in the datasheet.
2077 struct regulator
*regulator_get_exclusive(struct device
*dev
, const char *id
)
2079 return _regulator_get(dev
, id
, EXCLUSIVE_GET
);
2081 EXPORT_SYMBOL_GPL(regulator_get_exclusive
);
2084 * regulator_get_optional - obtain optional access to a regulator.
2085 * @dev: device for regulator "consumer"
2086 * @id: Supply name or regulator ID.
2088 * Returns a struct regulator corresponding to the regulator producer,
2089 * or IS_ERR() condition containing errno.
2091 * This is intended for use by consumers for devices which can have
2092 * some supplies unconnected in normal use, such as some MMC devices.
2093 * It can allow the regulator core to provide stub supplies for other
2094 * supplies requested using normal regulator_get() calls without
2095 * disrupting the operation of drivers that can handle absent
2098 * Use of supply names configured via regulator_set_device_supply() is
2099 * strongly encouraged. It is recommended that the supply name used
2100 * should match the name used for the supply and/or the relevant
2101 * device pins in the datasheet.
2103 struct regulator
*regulator_get_optional(struct device
*dev
, const char *id
)
2105 return _regulator_get(dev
, id
, OPTIONAL_GET
);
2107 EXPORT_SYMBOL_GPL(regulator_get_optional
);
2109 static void destroy_regulator(struct regulator
*regulator
)
2111 struct regulator_dev
*rdev
= regulator
->rdev
;
2113 debugfs_remove_recursive(regulator
->debugfs
);
2115 if (regulator
->dev
) {
2116 if (regulator
->device_link
)
2117 device_link_remove(regulator
->dev
, &rdev
->dev
);
2119 /* remove any sysfs entries */
2120 sysfs_remove_link(&rdev
->dev
.kobj
, regulator
->supply_name
);
2123 regulator_lock(rdev
);
2124 list_del(®ulator
->list
);
2127 rdev
->exclusive
= 0;
2128 regulator_unlock(rdev
);
2130 kfree_const(regulator
->supply_name
);
2134 /* regulator_list_mutex lock held by regulator_put() */
2135 static void _regulator_put(struct regulator
*regulator
)
2137 struct regulator_dev
*rdev
;
2139 if (IS_ERR_OR_NULL(regulator
))
2142 lockdep_assert_held_once(®ulator_list_mutex
);
2144 /* Docs say you must disable before calling regulator_put() */
2145 WARN_ON(regulator
->enable_count
);
2147 rdev
= regulator
->rdev
;
2149 destroy_regulator(regulator
);
2151 module_put(rdev
->owner
);
2152 put_device(&rdev
->dev
);
2156 * regulator_put - "free" the regulator source
2157 * @regulator: regulator source
2159 * Note: drivers must ensure that all regulator_enable calls made on this
2160 * regulator source are balanced by regulator_disable calls prior to calling
2163 void regulator_put(struct regulator
*regulator
)
2165 mutex_lock(®ulator_list_mutex
);
2166 _regulator_put(regulator
);
2167 mutex_unlock(®ulator_list_mutex
);
2169 EXPORT_SYMBOL_GPL(regulator_put
);
2172 * regulator_register_supply_alias - Provide device alias for supply lookup
2174 * @dev: device that will be given as the regulator "consumer"
2175 * @id: Supply name or regulator ID
2176 * @alias_dev: device that should be used to lookup the supply
2177 * @alias_id: Supply name or regulator ID that should be used to lookup the
2180 * All lookups for id on dev will instead be conducted for alias_id on
2183 int regulator_register_supply_alias(struct device
*dev
, const char *id
,
2184 struct device
*alias_dev
,
2185 const char *alias_id
)
2187 struct regulator_supply_alias
*map
;
2189 map
= regulator_find_supply_alias(dev
, id
);
2193 map
= kzalloc(sizeof(struct regulator_supply_alias
), GFP_KERNEL
);
2198 map
->src_supply
= id
;
2199 map
->alias_dev
= alias_dev
;
2200 map
->alias_supply
= alias_id
;
2202 list_add(&map
->list
, ®ulator_supply_alias_list
);
2204 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
2205 id
, dev_name(dev
), alias_id
, dev_name(alias_dev
));
2209 EXPORT_SYMBOL_GPL(regulator_register_supply_alias
);
2212 * regulator_unregister_supply_alias - Remove device alias
2214 * @dev: device that will be given as the regulator "consumer"
2215 * @id: Supply name or regulator ID
2217 * Remove a lookup alias if one exists for id on dev.
2219 void regulator_unregister_supply_alias(struct device
*dev
, const char *id
)
2221 struct regulator_supply_alias
*map
;
2223 map
= regulator_find_supply_alias(dev
, id
);
2225 list_del(&map
->list
);
2229 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias
);
2232 * regulator_bulk_register_supply_alias - register multiple aliases
2234 * @dev: device that will be given as the regulator "consumer"
2235 * @id: List of supply names or regulator IDs
2236 * @alias_dev: device that should be used to lookup the supply
2237 * @alias_id: List of supply names or regulator IDs that should be used to
2239 * @num_id: Number of aliases to register
2241 * @return 0 on success, an errno on failure.
2243 * This helper function allows drivers to register several supply
2244 * aliases in one operation. If any of the aliases cannot be
2245 * registered any aliases that were registered will be removed
2246 * before returning to the caller.
2248 int regulator_bulk_register_supply_alias(struct device
*dev
,
2249 const char *const *id
,
2250 struct device
*alias_dev
,
2251 const char *const *alias_id
,
2257 for (i
= 0; i
< num_id
; ++i
) {
2258 ret
= regulator_register_supply_alias(dev
, id
[i
], alias_dev
,
2268 "Failed to create supply alias %s,%s -> %s,%s\n",
2269 id
[i
], dev_name(dev
), alias_id
[i
], dev_name(alias_dev
));
2272 regulator_unregister_supply_alias(dev
, id
[i
]);
2276 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias
);
2279 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
2281 * @dev: device that will be given as the regulator "consumer"
2282 * @id: List of supply names or regulator IDs
2283 * @num_id: Number of aliases to unregister
2285 * This helper function allows drivers to unregister several supply
2286 * aliases in one operation.
2288 void regulator_bulk_unregister_supply_alias(struct device
*dev
,
2289 const char *const *id
,
2294 for (i
= 0; i
< num_id
; ++i
)
2295 regulator_unregister_supply_alias(dev
, id
[i
]);
2297 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias
);
2300 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
2301 static int regulator_ena_gpio_request(struct regulator_dev
*rdev
,
2302 const struct regulator_config
*config
)
2304 struct regulator_enable_gpio
*pin
, *new_pin
;
2305 struct gpio_desc
*gpiod
;
2307 gpiod
= config
->ena_gpiod
;
2308 new_pin
= kzalloc(sizeof(*new_pin
), GFP_KERNEL
);
2310 mutex_lock(®ulator_list_mutex
);
2312 list_for_each_entry(pin
, ®ulator_ena_gpio_list
, list
) {
2313 if (pin
->gpiod
== gpiod
) {
2314 rdev_dbg(rdev
, "GPIO is already used\n");
2315 goto update_ena_gpio_to_rdev
;
2319 if (new_pin
== NULL
) {
2320 mutex_unlock(®ulator_list_mutex
);
2328 list_add(&pin
->list
, ®ulator_ena_gpio_list
);
2330 update_ena_gpio_to_rdev
:
2331 pin
->request_count
++;
2332 rdev
->ena_pin
= pin
;
2334 mutex_unlock(®ulator_list_mutex
);
2340 static void regulator_ena_gpio_free(struct regulator_dev
*rdev
)
2342 struct regulator_enable_gpio
*pin
, *n
;
2347 /* Free the GPIO only in case of no use */
2348 list_for_each_entry_safe(pin
, n
, ®ulator_ena_gpio_list
, list
) {
2349 if (pin
!= rdev
->ena_pin
)
2352 if (--pin
->request_count
)
2355 gpiod_put(pin
->gpiod
);
2356 list_del(&pin
->list
);
2361 rdev
->ena_pin
= NULL
;
2365 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
2366 * @rdev: regulator_dev structure
2367 * @enable: enable GPIO at initial use?
2369 * GPIO is enabled in case of initial use. (enable_count is 0)
2370 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2372 static int regulator_ena_gpio_ctrl(struct regulator_dev
*rdev
, bool enable
)
2374 struct regulator_enable_gpio
*pin
= rdev
->ena_pin
;
2380 /* Enable GPIO at initial use */
2381 if (pin
->enable_count
== 0)
2382 gpiod_set_value_cansleep(pin
->gpiod
, 1);
2384 pin
->enable_count
++;
2386 if (pin
->enable_count
> 1) {
2387 pin
->enable_count
--;
2391 /* Disable GPIO if not used */
2392 if (pin
->enable_count
<= 1) {
2393 gpiod_set_value_cansleep(pin
->gpiod
, 0);
2394 pin
->enable_count
= 0;
2402 * _regulator_enable_delay - a delay helper function
2403 * @delay: time to delay in microseconds
2405 * Delay for the requested amount of time as per the guidelines in:
2407 * Documentation/timers/timers-howto.rst
2409 * The assumption here is that regulators will never be enabled in
2410 * atomic context and therefore sleeping functions can be used.
2412 static void _regulator_enable_delay(unsigned int delay
)
2414 unsigned int ms
= delay
/ 1000;
2415 unsigned int us
= delay
% 1000;
2419 * For small enough values, handle super-millisecond
2420 * delays in the usleep_range() call below.
2429 * Give the scheduler some room to coalesce with any other
2430 * wakeup sources. For delays shorter than 10 us, don't even
2431 * bother setting up high-resolution timers and just busy-
2435 usleep_range(us
, us
+ 100);
2441 * _regulator_check_status_enabled
2443 * A helper function to check if the regulator status can be interpreted
2444 * as 'regulator is enabled'.
2445 * @rdev: the regulator device to check
2448 * * 1 - if status shows regulator is in enabled state
2449 * * 0 - if not enabled state
2450 * * Error Value - as received from ops->get_status()
2452 static inline int _regulator_check_status_enabled(struct regulator_dev
*rdev
)
2454 int ret
= rdev
->desc
->ops
->get_status(rdev
);
2457 rdev_info(rdev
, "get_status returned error: %d\n", ret
);
2462 case REGULATOR_STATUS_OFF
:
2463 case REGULATOR_STATUS_ERROR
:
2464 case REGULATOR_STATUS_UNDEFINED
:
2471 static int _regulator_do_enable(struct regulator_dev
*rdev
)
2475 /* Query before enabling in case configuration dependent. */
2476 ret
= _regulator_get_enable_time(rdev
);
2480 rdev_warn(rdev
, "enable_time() failed: %pe\n", ERR_PTR(ret
));
2484 trace_regulator_enable(rdev_get_name(rdev
));
2486 if (rdev
->desc
->off_on_delay
) {
2487 /* if needed, keep a distance of off_on_delay from last time
2488 * this regulator was disabled.
2490 unsigned long start_jiffy
= jiffies
;
2491 unsigned long intended
, max_delay
, remaining
;
2493 max_delay
= usecs_to_jiffies(rdev
->desc
->off_on_delay
);
2494 intended
= rdev
->last_off_jiffy
+ max_delay
;
2496 if (time_before(start_jiffy
, intended
)) {
2497 /* calc remaining jiffies to deal with one-time
2499 * in case of multiple timer wrapping, either it can be
2500 * detected by out-of-range remaining, or it cannot be
2501 * detected and we get a penalty of
2502 * _regulator_enable_delay().
2504 remaining
= intended
- start_jiffy
;
2505 if (remaining
<= max_delay
)
2506 _regulator_enable_delay(
2507 jiffies_to_usecs(remaining
));
2511 if (rdev
->ena_pin
) {
2512 if (!rdev
->ena_gpio_state
) {
2513 ret
= regulator_ena_gpio_ctrl(rdev
, true);
2516 rdev
->ena_gpio_state
= 1;
2518 } else if (rdev
->desc
->ops
->enable
) {
2519 ret
= rdev
->desc
->ops
->enable(rdev
);
2526 /* Allow the regulator to ramp; it would be useful to extend
2527 * this for bulk operations so that the regulators can ramp
2529 trace_regulator_enable_delay(rdev_get_name(rdev
));
2531 /* If poll_enabled_time is set, poll upto the delay calculated
2532 * above, delaying poll_enabled_time uS to check if the regulator
2533 * actually got enabled.
2534 * If the regulator isn't enabled after enable_delay has
2535 * expired, return -ETIMEDOUT.
2537 if (rdev
->desc
->poll_enabled_time
) {
2538 unsigned int time_remaining
= delay
;
2540 while (time_remaining
> 0) {
2541 _regulator_enable_delay(rdev
->desc
->poll_enabled_time
);
2543 if (rdev
->desc
->ops
->get_status
) {
2544 ret
= _regulator_check_status_enabled(rdev
);
2549 } else if (rdev
->desc
->ops
->is_enabled(rdev
))
2552 time_remaining
-= rdev
->desc
->poll_enabled_time
;
2555 if (time_remaining
<= 0) {
2556 rdev_err(rdev
, "Enabled check timed out\n");
2560 _regulator_enable_delay(delay
);
2563 trace_regulator_enable_complete(rdev_get_name(rdev
));
2569 * _regulator_handle_consumer_enable - handle that a consumer enabled
2570 * @regulator: regulator source
2572 * Some things on a regulator consumer (like the contribution towards total
2573 * load on the regulator) only have an effect when the consumer wants the
2574 * regulator enabled. Explained in example with two consumers of the same
2576 * consumer A: set_load(100); => total load = 0
2577 * consumer A: regulator_enable(); => total load = 100
2578 * consumer B: set_load(1000); => total load = 100
2579 * consumer B: regulator_enable(); => total load = 1100
2580 * consumer A: regulator_disable(); => total_load = 1000
2582 * This function (together with _regulator_handle_consumer_disable) is
2583 * responsible for keeping track of the refcount for a given regulator consumer
2584 * and applying / unapplying these things.
2586 * Returns 0 upon no error; -error upon error.
2588 static int _regulator_handle_consumer_enable(struct regulator
*regulator
)
2590 struct regulator_dev
*rdev
= regulator
->rdev
;
2592 lockdep_assert_held_once(&rdev
->mutex
.base
);
2594 regulator
->enable_count
++;
2595 if (regulator
->uA_load
&& regulator
->enable_count
== 1)
2596 return drms_uA_update(rdev
);
2602 * _regulator_handle_consumer_disable - handle that a consumer disabled
2603 * @regulator: regulator source
2605 * The opposite of _regulator_handle_consumer_enable().
2607 * Returns 0 upon no error; -error upon error.
2609 static int _regulator_handle_consumer_disable(struct regulator
*regulator
)
2611 struct regulator_dev
*rdev
= regulator
->rdev
;
2613 lockdep_assert_held_once(&rdev
->mutex
.base
);
2615 if (!regulator
->enable_count
) {
2616 rdev_err(rdev
, "Underflow of regulator enable count\n");
2620 regulator
->enable_count
--;
2621 if (regulator
->uA_load
&& regulator
->enable_count
== 0)
2622 return drms_uA_update(rdev
);
2627 /* locks held by regulator_enable() */
2628 static int _regulator_enable(struct regulator
*regulator
)
2630 struct regulator_dev
*rdev
= regulator
->rdev
;
2633 lockdep_assert_held_once(&rdev
->mutex
.base
);
2635 if (rdev
->use_count
== 0 && rdev
->supply
) {
2636 ret
= _regulator_enable(rdev
->supply
);
2641 /* balance only if there are regulators coupled */
2642 if (rdev
->coupling_desc
.n_coupled
> 1) {
2643 ret
= regulator_balance_voltage(rdev
, PM_SUSPEND_ON
);
2645 goto err_disable_supply
;
2648 ret
= _regulator_handle_consumer_enable(regulator
);
2650 goto err_disable_supply
;
2652 if (rdev
->use_count
== 0) {
2653 /* The regulator may on if it's not switchable or left on */
2654 ret
= _regulator_is_enabled(rdev
);
2655 if (ret
== -EINVAL
|| ret
== 0) {
2656 if (!regulator_ops_is_valid(rdev
,
2657 REGULATOR_CHANGE_STATUS
)) {
2659 goto err_consumer_disable
;
2662 ret
= _regulator_do_enable(rdev
);
2664 goto err_consumer_disable
;
2666 _notifier_call_chain(rdev
, REGULATOR_EVENT_ENABLE
,
2668 } else if (ret
< 0) {
2669 rdev_err(rdev
, "is_enabled() failed: %pe\n", ERR_PTR(ret
));
2670 goto err_consumer_disable
;
2672 /* Fallthrough on positive return values - already enabled */
2679 err_consumer_disable
:
2680 _regulator_handle_consumer_disable(regulator
);
2683 if (rdev
->use_count
== 0 && rdev
->supply
)
2684 _regulator_disable(rdev
->supply
);
2690 * regulator_enable - enable regulator output
2691 * @regulator: regulator source
2693 * Request that the regulator be enabled with the regulator output at
2694 * the predefined voltage or current value. Calls to regulator_enable()
2695 * must be balanced with calls to regulator_disable().
2697 * NOTE: the output value can be set by other drivers, boot loader or may be
2698 * hardwired in the regulator.
2700 int regulator_enable(struct regulator
*regulator
)
2702 struct regulator_dev
*rdev
= regulator
->rdev
;
2703 struct ww_acquire_ctx ww_ctx
;
2706 regulator_lock_dependent(rdev
, &ww_ctx
);
2707 ret
= _regulator_enable(regulator
);
2708 regulator_unlock_dependent(rdev
, &ww_ctx
);
2712 EXPORT_SYMBOL_GPL(regulator_enable
);
2714 static int _regulator_do_disable(struct regulator_dev
*rdev
)
2718 trace_regulator_disable(rdev_get_name(rdev
));
2720 if (rdev
->ena_pin
) {
2721 if (rdev
->ena_gpio_state
) {
2722 ret
= regulator_ena_gpio_ctrl(rdev
, false);
2725 rdev
->ena_gpio_state
= 0;
2728 } else if (rdev
->desc
->ops
->disable
) {
2729 ret
= rdev
->desc
->ops
->disable(rdev
);
2734 /* cares about last_off_jiffy only if off_on_delay is required by
2737 if (rdev
->desc
->off_on_delay
)
2738 rdev
->last_off_jiffy
= jiffies
;
2740 trace_regulator_disable_complete(rdev_get_name(rdev
));
2745 /* locks held by regulator_disable() */
2746 static int _regulator_disable(struct regulator
*regulator
)
2748 struct regulator_dev
*rdev
= regulator
->rdev
;
2751 lockdep_assert_held_once(&rdev
->mutex
.base
);
2753 if (WARN(rdev
->use_count
<= 0,
2754 "unbalanced disables for %s\n", rdev_get_name(rdev
)))
2757 /* are we the last user and permitted to disable ? */
2758 if (rdev
->use_count
== 1 &&
2759 (rdev
->constraints
&& !rdev
->constraints
->always_on
)) {
2761 /* we are last user */
2762 if (regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
)) {
2763 ret
= _notifier_call_chain(rdev
,
2764 REGULATOR_EVENT_PRE_DISABLE
,
2766 if (ret
& NOTIFY_STOP_MASK
)
2769 ret
= _regulator_do_disable(rdev
);
2771 rdev_err(rdev
, "failed to disable: %pe\n", ERR_PTR(ret
));
2772 _notifier_call_chain(rdev
,
2773 REGULATOR_EVENT_ABORT_DISABLE
,
2777 _notifier_call_chain(rdev
, REGULATOR_EVENT_DISABLE
,
2781 rdev
->use_count
= 0;
2782 } else if (rdev
->use_count
> 1) {
2787 ret
= _regulator_handle_consumer_disable(regulator
);
2789 if (ret
== 0 && rdev
->coupling_desc
.n_coupled
> 1)
2790 ret
= regulator_balance_voltage(rdev
, PM_SUSPEND_ON
);
2792 if (ret
== 0 && rdev
->use_count
== 0 && rdev
->supply
)
2793 ret
= _regulator_disable(rdev
->supply
);
2799 * regulator_disable - disable regulator output
2800 * @regulator: regulator source
2802 * Disable the regulator output voltage or current. Calls to
2803 * regulator_enable() must be balanced with calls to
2804 * regulator_disable().
2806 * NOTE: this will only disable the regulator output if no other consumer
2807 * devices have it enabled, the regulator device supports disabling and
2808 * machine constraints permit this operation.
2810 int regulator_disable(struct regulator
*regulator
)
2812 struct regulator_dev
*rdev
= regulator
->rdev
;
2813 struct ww_acquire_ctx ww_ctx
;
2816 regulator_lock_dependent(rdev
, &ww_ctx
);
2817 ret
= _regulator_disable(regulator
);
2818 regulator_unlock_dependent(rdev
, &ww_ctx
);
2822 EXPORT_SYMBOL_GPL(regulator_disable
);
2824 /* locks held by regulator_force_disable() */
2825 static int _regulator_force_disable(struct regulator_dev
*rdev
)
2829 lockdep_assert_held_once(&rdev
->mutex
.base
);
2831 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2832 REGULATOR_EVENT_PRE_DISABLE
, NULL
);
2833 if (ret
& NOTIFY_STOP_MASK
)
2836 ret
= _regulator_do_disable(rdev
);
2838 rdev_err(rdev
, "failed to force disable: %pe\n", ERR_PTR(ret
));
2839 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2840 REGULATOR_EVENT_ABORT_DISABLE
, NULL
);
2844 _notifier_call_chain(rdev
, REGULATOR_EVENT_FORCE_DISABLE
|
2845 REGULATOR_EVENT_DISABLE
, NULL
);
2851 * regulator_force_disable - force disable regulator output
2852 * @regulator: regulator source
2854 * Forcibly disable the regulator output voltage or current.
2855 * NOTE: this *will* disable the regulator output even if other consumer
2856 * devices have it enabled. This should be used for situations when device
2857 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2859 int regulator_force_disable(struct regulator
*regulator
)
2861 struct regulator_dev
*rdev
= regulator
->rdev
;
2862 struct ww_acquire_ctx ww_ctx
;
2865 regulator_lock_dependent(rdev
, &ww_ctx
);
2867 ret
= _regulator_force_disable(regulator
->rdev
);
2869 if (rdev
->coupling_desc
.n_coupled
> 1)
2870 regulator_balance_voltage(rdev
, PM_SUSPEND_ON
);
2872 if (regulator
->uA_load
) {
2873 regulator
->uA_load
= 0;
2874 ret
= drms_uA_update(rdev
);
2877 if (rdev
->use_count
!= 0 && rdev
->supply
)
2878 _regulator_disable(rdev
->supply
);
2880 regulator_unlock_dependent(rdev
, &ww_ctx
);
2884 EXPORT_SYMBOL_GPL(regulator_force_disable
);
2886 static void regulator_disable_work(struct work_struct
*work
)
2888 struct regulator_dev
*rdev
= container_of(work
, struct regulator_dev
,
2890 struct ww_acquire_ctx ww_ctx
;
2892 struct regulator
*regulator
;
2893 int total_count
= 0;
2895 regulator_lock_dependent(rdev
, &ww_ctx
);
2898 * Workqueue functions queue the new work instance while the previous
2899 * work instance is being processed. Cancel the queued work instance
2900 * as the work instance under processing does the job of the queued
2903 cancel_delayed_work(&rdev
->disable_work
);
2905 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
2906 count
= regulator
->deferred_disables
;
2911 total_count
+= count
;
2912 regulator
->deferred_disables
= 0;
2914 for (i
= 0; i
< count
; i
++) {
2915 ret
= _regulator_disable(regulator
);
2917 rdev_err(rdev
, "Deferred disable failed: %pe\n",
2921 WARN_ON(!total_count
);
2923 if (rdev
->coupling_desc
.n_coupled
> 1)
2924 regulator_balance_voltage(rdev
, PM_SUSPEND_ON
);
2926 regulator_unlock_dependent(rdev
, &ww_ctx
);
2930 * regulator_disable_deferred - disable regulator output with delay
2931 * @regulator: regulator source
2932 * @ms: milliseconds until the regulator is disabled
2934 * Execute regulator_disable() on the regulator after a delay. This
2935 * is intended for use with devices that require some time to quiesce.
2937 * NOTE: this will only disable the regulator output if no other consumer
2938 * devices have it enabled, the regulator device supports disabling and
2939 * machine constraints permit this operation.
2941 int regulator_disable_deferred(struct regulator
*regulator
, int ms
)
2943 struct regulator_dev
*rdev
= regulator
->rdev
;
2946 return regulator_disable(regulator
);
2948 regulator_lock(rdev
);
2949 regulator
->deferred_disables
++;
2950 mod_delayed_work(system_power_efficient_wq
, &rdev
->disable_work
,
2951 msecs_to_jiffies(ms
));
2952 regulator_unlock(rdev
);
2956 EXPORT_SYMBOL_GPL(regulator_disable_deferred
);
2958 static int _regulator_is_enabled(struct regulator_dev
*rdev
)
2960 /* A GPIO control always takes precedence */
2962 return rdev
->ena_gpio_state
;
2964 /* If we don't know then assume that the regulator is always on */
2965 if (!rdev
->desc
->ops
->is_enabled
)
2968 return rdev
->desc
->ops
->is_enabled(rdev
);
2971 static int _regulator_list_voltage(struct regulator_dev
*rdev
,
2972 unsigned selector
, int lock
)
2974 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
2977 if (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1 && !selector
)
2978 return rdev
->desc
->fixed_uV
;
2980 if (ops
->list_voltage
) {
2981 if (selector
>= rdev
->desc
->n_voltages
)
2983 if (selector
< rdev
->desc
->linear_min_sel
)
2986 regulator_lock(rdev
);
2987 ret
= ops
->list_voltage(rdev
, selector
);
2989 regulator_unlock(rdev
);
2990 } else if (rdev
->is_switch
&& rdev
->supply
) {
2991 ret
= _regulator_list_voltage(rdev
->supply
->rdev
,
2998 if (ret
< rdev
->constraints
->min_uV
)
3000 else if (ret
> rdev
->constraints
->max_uV
)
3008 * regulator_is_enabled - is the regulator output enabled
3009 * @regulator: regulator source
3011 * Returns positive if the regulator driver backing the source/client
3012 * has requested that the device be enabled, zero if it hasn't, else a
3013 * negative errno code.
3015 * Note that the device backing this regulator handle can have multiple
3016 * users, so it might be enabled even if regulator_enable() was never
3017 * called for this particular source.
3019 int regulator_is_enabled(struct regulator
*regulator
)
3023 if (regulator
->always_on
)
3026 regulator_lock(regulator
->rdev
);
3027 ret
= _regulator_is_enabled(regulator
->rdev
);
3028 regulator_unlock(regulator
->rdev
);
3032 EXPORT_SYMBOL_GPL(regulator_is_enabled
);
3035 * regulator_count_voltages - count regulator_list_voltage() selectors
3036 * @regulator: regulator source
3038 * Returns number of selectors, or negative errno. Selectors are
3039 * numbered starting at zero, and typically correspond to bitfields
3040 * in hardware registers.
3042 int regulator_count_voltages(struct regulator
*regulator
)
3044 struct regulator_dev
*rdev
= regulator
->rdev
;
3046 if (rdev
->desc
->n_voltages
)
3047 return rdev
->desc
->n_voltages
;
3049 if (!rdev
->is_switch
|| !rdev
->supply
)
3052 return regulator_count_voltages(rdev
->supply
);
3054 EXPORT_SYMBOL_GPL(regulator_count_voltages
);
3057 * regulator_list_voltage - enumerate supported voltages
3058 * @regulator: regulator source
3059 * @selector: identify voltage to list
3060 * Context: can sleep
3062 * Returns a voltage that can be passed to @regulator_set_voltage(),
3063 * zero if this selector code can't be used on this system, or a
3066 int regulator_list_voltage(struct regulator
*regulator
, unsigned selector
)
3068 return _regulator_list_voltage(regulator
->rdev
, selector
, 1);
3070 EXPORT_SYMBOL_GPL(regulator_list_voltage
);
3073 * regulator_get_regmap - get the regulator's register map
3074 * @regulator: regulator source
3076 * Returns the register map for the given regulator, or an ERR_PTR value
3077 * if the regulator doesn't use regmap.
3079 struct regmap
*regulator_get_regmap(struct regulator
*regulator
)
3081 struct regmap
*map
= regulator
->rdev
->regmap
;
3083 return map
? map
: ERR_PTR(-EOPNOTSUPP
);
3087 * regulator_get_hardware_vsel_register - get the HW voltage selector register
3088 * @regulator: regulator source
3089 * @vsel_reg: voltage selector register, output parameter
3090 * @vsel_mask: mask for voltage selector bitfield, output parameter
3092 * Returns the hardware register offset and bitmask used for setting the
3093 * regulator voltage. This might be useful when configuring voltage-scaling
3094 * hardware or firmware that can make I2C requests behind the kernel's back,
3097 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
3098 * and 0 is returned, otherwise a negative errno is returned.
3100 int regulator_get_hardware_vsel_register(struct regulator
*regulator
,
3102 unsigned *vsel_mask
)
3104 struct regulator_dev
*rdev
= regulator
->rdev
;
3105 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3107 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
3110 *vsel_reg
= rdev
->desc
->vsel_reg
;
3111 *vsel_mask
= rdev
->desc
->vsel_mask
;
3115 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register
);
3118 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
3119 * @regulator: regulator source
3120 * @selector: identify voltage to list
3122 * Converts the selector to a hardware-specific voltage selector that can be
3123 * directly written to the regulator registers. The address of the voltage
3124 * register can be determined by calling @regulator_get_hardware_vsel_register.
3126 * On error a negative errno is returned.
3128 int regulator_list_hardware_vsel(struct regulator
*regulator
,
3131 struct regulator_dev
*rdev
= regulator
->rdev
;
3132 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3134 if (selector
>= rdev
->desc
->n_voltages
)
3136 if (selector
< rdev
->desc
->linear_min_sel
)
3138 if (ops
->set_voltage_sel
!= regulator_set_voltage_sel_regmap
)
3143 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel
);
3146 * regulator_get_linear_step - return the voltage step size between VSEL values
3147 * @regulator: regulator source
3149 * Returns the voltage step size between VSEL values for linear
3150 * regulators, or return 0 if the regulator isn't a linear regulator.
3152 unsigned int regulator_get_linear_step(struct regulator
*regulator
)
3154 struct regulator_dev
*rdev
= regulator
->rdev
;
3156 return rdev
->desc
->uV_step
;
3158 EXPORT_SYMBOL_GPL(regulator_get_linear_step
);
3161 * regulator_is_supported_voltage - check if a voltage range can be supported
3163 * @regulator: Regulator to check.
3164 * @min_uV: Minimum required voltage in uV.
3165 * @max_uV: Maximum required voltage in uV.
3167 * Returns a boolean.
3169 int regulator_is_supported_voltage(struct regulator
*regulator
,
3170 int min_uV
, int max_uV
)
3172 struct regulator_dev
*rdev
= regulator
->rdev
;
3173 int i
, voltages
, ret
;
3175 /* If we can't change voltage check the current voltage */
3176 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
3177 ret
= regulator_get_voltage(regulator
);
3179 return min_uV
<= ret
&& ret
<= max_uV
;
3184 /* Any voltage within constrains range is fine? */
3185 if (rdev
->desc
->continuous_voltage_range
)
3186 return min_uV
>= rdev
->constraints
->min_uV
&&
3187 max_uV
<= rdev
->constraints
->max_uV
;
3189 ret
= regulator_count_voltages(regulator
);
3194 for (i
= 0; i
< voltages
; i
++) {
3195 ret
= regulator_list_voltage(regulator
, i
);
3197 if (ret
>= min_uV
&& ret
<= max_uV
)
3203 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage
);
3205 static int regulator_map_voltage(struct regulator_dev
*rdev
, int min_uV
,
3208 const struct regulator_desc
*desc
= rdev
->desc
;
3210 if (desc
->ops
->map_voltage
)
3211 return desc
->ops
->map_voltage(rdev
, min_uV
, max_uV
);
3213 if (desc
->ops
->list_voltage
== regulator_list_voltage_linear
)
3214 return regulator_map_voltage_linear(rdev
, min_uV
, max_uV
);
3216 if (desc
->ops
->list_voltage
== regulator_list_voltage_linear_range
)
3217 return regulator_map_voltage_linear_range(rdev
, min_uV
, max_uV
);
3219 if (desc
->ops
->list_voltage
==
3220 regulator_list_voltage_pickable_linear_range
)
3221 return regulator_map_voltage_pickable_linear_range(rdev
,
3224 return regulator_map_voltage_iterate(rdev
, min_uV
, max_uV
);
3227 static int _regulator_call_set_voltage(struct regulator_dev
*rdev
,
3228 int min_uV
, int max_uV
,
3231 struct pre_voltage_change_data data
;
3234 data
.old_uV
= regulator_get_voltage_rdev(rdev
);
3235 data
.min_uV
= min_uV
;
3236 data
.max_uV
= max_uV
;
3237 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
3239 if (ret
& NOTIFY_STOP_MASK
)
3242 ret
= rdev
->desc
->ops
->set_voltage(rdev
, min_uV
, max_uV
, selector
);
3246 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
3247 (void *)data
.old_uV
);
3252 static int _regulator_call_set_voltage_sel(struct regulator_dev
*rdev
,
3253 int uV
, unsigned selector
)
3255 struct pre_voltage_change_data data
;
3258 data
.old_uV
= regulator_get_voltage_rdev(rdev
);
3261 ret
= _notifier_call_chain(rdev
, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE
,
3263 if (ret
& NOTIFY_STOP_MASK
)
3266 ret
= rdev
->desc
->ops
->set_voltage_sel(rdev
, selector
);
3270 _notifier_call_chain(rdev
, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE
,
3271 (void *)data
.old_uV
);
3276 static int _regulator_set_voltage_sel_step(struct regulator_dev
*rdev
,
3277 int uV
, int new_selector
)
3279 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3280 int diff
, old_sel
, curr_sel
, ret
;
3282 /* Stepping is only needed if the regulator is enabled. */
3283 if (!_regulator_is_enabled(rdev
))
3286 if (!ops
->get_voltage_sel
)
3289 old_sel
= ops
->get_voltage_sel(rdev
);
3293 diff
= new_selector
- old_sel
;
3295 return 0; /* No change needed. */
3299 for (curr_sel
= old_sel
+ rdev
->desc
->vsel_step
;
3300 curr_sel
< new_selector
;
3301 curr_sel
+= rdev
->desc
->vsel_step
) {
3303 * Call the callback directly instead of using
3304 * _regulator_call_set_voltage_sel() as we don't
3305 * want to notify anyone yet. Same in the branch
3308 ret
= ops
->set_voltage_sel(rdev
, curr_sel
);
3313 /* Stepping down. */
3314 for (curr_sel
= old_sel
- rdev
->desc
->vsel_step
;
3315 curr_sel
> new_selector
;
3316 curr_sel
-= rdev
->desc
->vsel_step
) {
3317 ret
= ops
->set_voltage_sel(rdev
, curr_sel
);
3324 /* The final selector will trigger the notifiers. */
3325 return _regulator_call_set_voltage_sel(rdev
, uV
, new_selector
);
3329 * At least try to return to the previous voltage if setting a new
3332 (void)ops
->set_voltage_sel(rdev
, old_sel
);
3336 static int _regulator_set_voltage_time(struct regulator_dev
*rdev
,
3337 int old_uV
, int new_uV
)
3339 unsigned int ramp_delay
= 0;
3341 if (rdev
->constraints
->ramp_delay
)
3342 ramp_delay
= rdev
->constraints
->ramp_delay
;
3343 else if (rdev
->desc
->ramp_delay
)
3344 ramp_delay
= rdev
->desc
->ramp_delay
;
3345 else if (rdev
->constraints
->settling_time
)
3346 return rdev
->constraints
->settling_time
;
3347 else if (rdev
->constraints
->settling_time_up
&&
3349 return rdev
->constraints
->settling_time_up
;
3350 else if (rdev
->constraints
->settling_time_down
&&
3352 return rdev
->constraints
->settling_time_down
;
3354 if (ramp_delay
== 0) {
3355 rdev_dbg(rdev
, "ramp_delay not set\n");
3359 return DIV_ROUND_UP(abs(new_uV
- old_uV
), ramp_delay
);
3362 static int _regulator_do_set_voltage(struct regulator_dev
*rdev
,
3363 int min_uV
, int max_uV
)
3368 unsigned int selector
;
3369 int old_selector
= -1;
3370 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
3371 int old_uV
= regulator_get_voltage_rdev(rdev
);
3373 trace_regulator_set_voltage(rdev_get_name(rdev
), min_uV
, max_uV
);
3375 min_uV
+= rdev
->constraints
->uV_offset
;
3376 max_uV
+= rdev
->constraints
->uV_offset
;
3379 * If we can't obtain the old selector there is not enough
3380 * info to call set_voltage_time_sel().
3382 if (_regulator_is_enabled(rdev
) &&
3383 ops
->set_voltage_time_sel
&& ops
->get_voltage_sel
) {
3384 old_selector
= ops
->get_voltage_sel(rdev
);
3385 if (old_selector
< 0)
3386 return old_selector
;
3389 if (ops
->set_voltage
) {
3390 ret
= _regulator_call_set_voltage(rdev
, min_uV
, max_uV
,
3394 if (ops
->list_voltage
)
3395 best_val
= ops
->list_voltage(rdev
,
3398 best_val
= regulator_get_voltage_rdev(rdev
);
3401 } else if (ops
->set_voltage_sel
) {
3402 ret
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
3404 best_val
= ops
->list_voltage(rdev
, ret
);
3405 if (min_uV
<= best_val
&& max_uV
>= best_val
) {
3407 if (old_selector
== selector
)
3409 else if (rdev
->desc
->vsel_step
)
3410 ret
= _regulator_set_voltage_sel_step(
3411 rdev
, best_val
, selector
);
3413 ret
= _regulator_call_set_voltage_sel(
3414 rdev
, best_val
, selector
);
3426 if (ops
->set_voltage_time_sel
) {
3428 * Call set_voltage_time_sel if successfully obtained
3431 if (old_selector
>= 0 && old_selector
!= selector
)
3432 delay
= ops
->set_voltage_time_sel(rdev
, old_selector
,
3435 if (old_uV
!= best_val
) {
3436 if (ops
->set_voltage_time
)
3437 delay
= ops
->set_voltage_time(rdev
, old_uV
,
3440 delay
= _regulator_set_voltage_time(rdev
,
3447 rdev_warn(rdev
, "failed to get delay: %pe\n", ERR_PTR(delay
));
3451 /* Insert any necessary delays */
3452 if (delay
>= 1000) {
3453 mdelay(delay
/ 1000);
3454 udelay(delay
% 1000);
3459 if (best_val
>= 0) {
3460 unsigned long data
= best_val
;
3462 _notifier_call_chain(rdev
, REGULATOR_EVENT_VOLTAGE_CHANGE
,
3467 trace_regulator_set_voltage_complete(rdev_get_name(rdev
), best_val
);
3472 static int _regulator_do_set_suspend_voltage(struct regulator_dev
*rdev
,
3473 int min_uV
, int max_uV
, suspend_state_t state
)
3475 struct regulator_state
*rstate
;
3478 rstate
= regulator_get_suspend_state(rdev
, state
);
3482 if (min_uV
< rstate
->min_uV
)
3483 min_uV
= rstate
->min_uV
;
3484 if (max_uV
> rstate
->max_uV
)
3485 max_uV
= rstate
->max_uV
;
3487 sel
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
3491 uV
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
3492 if (uV
>= min_uV
&& uV
<= max_uV
)
3498 static int regulator_set_voltage_unlocked(struct regulator
*regulator
,
3499 int min_uV
, int max_uV
,
3500 suspend_state_t state
)
3502 struct regulator_dev
*rdev
= regulator
->rdev
;
3503 struct regulator_voltage
*voltage
= ®ulator
->voltage
[state
];
3505 int old_min_uV
, old_max_uV
;
3508 /* If we're setting the same range as last time the change
3509 * should be a noop (some cpufreq implementations use the same
3510 * voltage for multiple frequencies, for example).
3512 if (voltage
->min_uV
== min_uV
&& voltage
->max_uV
== max_uV
)
3515 /* If we're trying to set a range that overlaps the current voltage,
3516 * return successfully even though the regulator does not support
3517 * changing the voltage.
3519 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_VOLTAGE
)) {
3520 current_uV
= regulator_get_voltage_rdev(rdev
);
3521 if (min_uV
<= current_uV
&& current_uV
<= max_uV
) {
3522 voltage
->min_uV
= min_uV
;
3523 voltage
->max_uV
= max_uV
;
3529 if (!rdev
->desc
->ops
->set_voltage
&&
3530 !rdev
->desc
->ops
->set_voltage_sel
) {
3535 /* constraints check */
3536 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
3540 /* restore original values in case of error */
3541 old_min_uV
= voltage
->min_uV
;
3542 old_max_uV
= voltage
->max_uV
;
3543 voltage
->min_uV
= min_uV
;
3544 voltage
->max_uV
= max_uV
;
3546 /* for not coupled regulators this will just set the voltage */
3547 ret
= regulator_balance_voltage(rdev
, state
);
3549 voltage
->min_uV
= old_min_uV
;
3550 voltage
->max_uV
= old_max_uV
;
3557 int regulator_set_voltage_rdev(struct regulator_dev
*rdev
, int min_uV
,
3558 int max_uV
, suspend_state_t state
)
3560 int best_supply_uV
= 0;
3561 int supply_change_uV
= 0;
3565 regulator_ops_is_valid(rdev
->supply
->rdev
,
3566 REGULATOR_CHANGE_VOLTAGE
) &&
3567 (rdev
->desc
->min_dropout_uV
|| !(rdev
->desc
->ops
->get_voltage
||
3568 rdev
->desc
->ops
->get_voltage_sel
))) {
3569 int current_supply_uV
;
3572 selector
= regulator_map_voltage(rdev
, min_uV
, max_uV
);
3578 best_supply_uV
= _regulator_list_voltage(rdev
, selector
, 0);
3579 if (best_supply_uV
< 0) {
3580 ret
= best_supply_uV
;
3584 best_supply_uV
+= rdev
->desc
->min_dropout_uV
;
3586 current_supply_uV
= regulator_get_voltage_rdev(rdev
->supply
->rdev
);
3587 if (current_supply_uV
< 0) {
3588 ret
= current_supply_uV
;
3592 supply_change_uV
= best_supply_uV
- current_supply_uV
;
3595 if (supply_change_uV
> 0) {
3596 ret
= regulator_set_voltage_unlocked(rdev
->supply
,
3597 best_supply_uV
, INT_MAX
, state
);
3599 dev_err(&rdev
->dev
, "Failed to increase supply voltage: %pe\n",
3605 if (state
== PM_SUSPEND_ON
)
3606 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
3608 ret
= _regulator_do_set_suspend_voltage(rdev
, min_uV
,
3613 if (supply_change_uV
< 0) {
3614 ret
= regulator_set_voltage_unlocked(rdev
->supply
,
3615 best_supply_uV
, INT_MAX
, state
);
3617 dev_warn(&rdev
->dev
, "Failed to decrease supply voltage: %pe\n",
3619 /* No need to fail here */
3626 EXPORT_SYMBOL_GPL(regulator_set_voltage_rdev
);
3628 static int regulator_limit_voltage_step(struct regulator_dev
*rdev
,
3629 int *current_uV
, int *min_uV
)
3631 struct regulation_constraints
*constraints
= rdev
->constraints
;
3633 /* Limit voltage change only if necessary */
3634 if (!constraints
->max_uV_step
|| !_regulator_is_enabled(rdev
))
3637 if (*current_uV
< 0) {
3638 *current_uV
= regulator_get_voltage_rdev(rdev
);
3640 if (*current_uV
< 0)
3644 if (abs(*current_uV
- *min_uV
) <= constraints
->max_uV_step
)
3647 /* Clamp target voltage within the given step */
3648 if (*current_uV
< *min_uV
)
3649 *min_uV
= min(*current_uV
+ constraints
->max_uV_step
,
3652 *min_uV
= max(*current_uV
- constraints
->max_uV_step
,
3658 static int regulator_get_optimal_voltage(struct regulator_dev
*rdev
,
3660 int *min_uV
, int *max_uV
,
3661 suspend_state_t state
,
3664 struct coupling_desc
*c_desc
= &rdev
->coupling_desc
;
3665 struct regulator_dev
**c_rdevs
= c_desc
->coupled_rdevs
;
3666 struct regulation_constraints
*constraints
= rdev
->constraints
;
3667 int desired_min_uV
= 0, desired_max_uV
= INT_MAX
;
3668 int max_current_uV
= 0, min_current_uV
= INT_MAX
;
3669 int highest_min_uV
= 0, target_uV
, possible_uV
;
3670 int i
, ret
, max_spread
;
3676 * If there are no coupled regulators, simply set the voltage
3677 * demanded by consumers.
3679 if (n_coupled
== 1) {
3681 * If consumers don't provide any demands, set voltage
3684 desired_min_uV
= constraints
->min_uV
;
3685 desired_max_uV
= constraints
->max_uV
;
3687 ret
= regulator_check_consumers(rdev
,
3689 &desired_max_uV
, state
);
3693 possible_uV
= desired_min_uV
;
3699 /* Find highest min desired voltage */
3700 for (i
= 0; i
< n_coupled
; i
++) {
3702 int tmp_max
= INT_MAX
;
3704 lockdep_assert_held_once(&c_rdevs
[i
]->mutex
.base
);
3706 ret
= regulator_check_consumers(c_rdevs
[i
],
3712 ret
= regulator_check_voltage(c_rdevs
[i
], &tmp_min
, &tmp_max
);
3716 highest_min_uV
= max(highest_min_uV
, tmp_min
);
3719 desired_min_uV
= tmp_min
;
3720 desired_max_uV
= tmp_max
;
3724 max_spread
= constraints
->max_spread
[0];
3727 * Let target_uV be equal to the desired one if possible.
3728 * If not, set it to minimum voltage, allowed by other coupled
3731 target_uV
= max(desired_min_uV
, highest_min_uV
- max_spread
);
3734 * Find min and max voltages, which currently aren't violating
3737 for (i
= 1; i
< n_coupled
; i
++) {
3740 if (!_regulator_is_enabled(c_rdevs
[i
]))
3743 tmp_act
= regulator_get_voltage_rdev(c_rdevs
[i
]);
3747 min_current_uV
= min(tmp_act
, min_current_uV
);
3748 max_current_uV
= max(tmp_act
, max_current_uV
);
3751 /* There aren't any other regulators enabled */
3752 if (max_current_uV
== 0) {
3753 possible_uV
= target_uV
;
3756 * Correct target voltage, so as it currently isn't
3757 * violating max_spread
3759 possible_uV
= max(target_uV
, max_current_uV
- max_spread
);
3760 possible_uV
= min(possible_uV
, min_current_uV
+ max_spread
);
3763 if (possible_uV
> desired_max_uV
)
3766 done
= (possible_uV
== target_uV
);
3767 desired_min_uV
= possible_uV
;
3770 /* Apply max_uV_step constraint if necessary */
3771 if (state
== PM_SUSPEND_ON
) {
3772 ret
= regulator_limit_voltage_step(rdev
, current_uV
,
3781 /* Set current_uV if wasn't done earlier in the code and if necessary */
3782 if (n_coupled
> 1 && *current_uV
== -1) {
3784 if (_regulator_is_enabled(rdev
)) {
3785 ret
= regulator_get_voltage_rdev(rdev
);
3791 *current_uV
= desired_min_uV
;
3795 *min_uV
= desired_min_uV
;
3796 *max_uV
= desired_max_uV
;
3801 int regulator_do_balance_voltage(struct regulator_dev
*rdev
,
3802 suspend_state_t state
, bool skip_coupled
)
3804 struct regulator_dev
**c_rdevs
;
3805 struct regulator_dev
*best_rdev
;
3806 struct coupling_desc
*c_desc
= &rdev
->coupling_desc
;
3807 int i
, ret
, n_coupled
, best_min_uV
, best_max_uV
, best_c_rdev
;
3808 unsigned int delta
, best_delta
;
3809 unsigned long c_rdev_done
= 0;
3810 bool best_c_rdev_done
;
3812 c_rdevs
= c_desc
->coupled_rdevs
;
3813 n_coupled
= skip_coupled
? 1 : c_desc
->n_coupled
;
3816 * Find the best possible voltage change on each loop. Leave the loop
3817 * if there isn't any possible change.
3820 best_c_rdev_done
= false;
3828 * Find highest difference between optimal voltage
3829 * and current voltage.
3831 for (i
= 0; i
< n_coupled
; i
++) {
3833 * optimal_uV is the best voltage that can be set for
3834 * i-th regulator at the moment without violating
3835 * max_spread constraint in order to balance
3836 * the coupled voltages.
3838 int optimal_uV
= 0, optimal_max_uV
= 0, current_uV
= 0;
3840 if (test_bit(i
, &c_rdev_done
))
3843 ret
= regulator_get_optimal_voltage(c_rdevs
[i
],
3851 delta
= abs(optimal_uV
- current_uV
);
3853 if (delta
&& best_delta
<= delta
) {
3854 best_c_rdev_done
= ret
;
3856 best_rdev
= c_rdevs
[i
];
3857 best_min_uV
= optimal_uV
;
3858 best_max_uV
= optimal_max_uV
;
3863 /* Nothing to change, return successfully */
3869 ret
= regulator_set_voltage_rdev(best_rdev
, best_min_uV
,
3870 best_max_uV
, state
);
3875 if (best_c_rdev_done
)
3876 set_bit(best_c_rdev
, &c_rdev_done
);
3878 } while (n_coupled
> 1);
3884 static int regulator_balance_voltage(struct regulator_dev
*rdev
,
3885 suspend_state_t state
)
3887 struct coupling_desc
*c_desc
= &rdev
->coupling_desc
;
3888 struct regulator_coupler
*coupler
= c_desc
->coupler
;
3889 bool skip_coupled
= false;
3892 * If system is in a state other than PM_SUSPEND_ON, don't check
3893 * other coupled regulators.
3895 if (state
!= PM_SUSPEND_ON
)
3896 skip_coupled
= true;
3898 if (c_desc
->n_resolved
< c_desc
->n_coupled
) {
3899 rdev_err(rdev
, "Not all coupled regulators registered\n");
3903 /* Invoke custom balancer for customized couplers */
3904 if (coupler
&& coupler
->balance_voltage
)
3905 return coupler
->balance_voltage(coupler
, rdev
, state
);
3907 return regulator_do_balance_voltage(rdev
, state
, skip_coupled
);
3911 * regulator_set_voltage - set regulator output voltage
3912 * @regulator: regulator source
3913 * @min_uV: Minimum required voltage in uV
3914 * @max_uV: Maximum acceptable voltage in uV
3916 * Sets a voltage regulator to the desired output voltage. This can be set
3917 * during any regulator state. IOW, regulator can be disabled or enabled.
3919 * If the regulator is enabled then the voltage will change to the new value
3920 * immediately otherwise if the regulator is disabled the regulator will
3921 * output at the new voltage when enabled.
3923 * NOTE: If the regulator is shared between several devices then the lowest
3924 * request voltage that meets the system constraints will be used.
3925 * Regulator system constraints must be set for this regulator before
3926 * calling this function otherwise this call will fail.
3928 int regulator_set_voltage(struct regulator
*regulator
, int min_uV
, int max_uV
)
3930 struct ww_acquire_ctx ww_ctx
;
3933 regulator_lock_dependent(regulator
->rdev
, &ww_ctx
);
3935 ret
= regulator_set_voltage_unlocked(regulator
, min_uV
, max_uV
,
3938 regulator_unlock_dependent(regulator
->rdev
, &ww_ctx
);
3942 EXPORT_SYMBOL_GPL(regulator_set_voltage
);
3944 static inline int regulator_suspend_toggle(struct regulator_dev
*rdev
,
3945 suspend_state_t state
, bool en
)
3947 struct regulator_state
*rstate
;
3949 rstate
= regulator_get_suspend_state(rdev
, state
);
3953 if (!rstate
->changeable
)
3956 rstate
->enabled
= (en
) ? ENABLE_IN_SUSPEND
: DISABLE_IN_SUSPEND
;
3961 int regulator_suspend_enable(struct regulator_dev
*rdev
,
3962 suspend_state_t state
)
3964 return regulator_suspend_toggle(rdev
, state
, true);
3966 EXPORT_SYMBOL_GPL(regulator_suspend_enable
);
3968 int regulator_suspend_disable(struct regulator_dev
*rdev
,
3969 suspend_state_t state
)
3971 struct regulator
*regulator
;
3972 struct regulator_voltage
*voltage
;
3975 * if any consumer wants this regulator device keeping on in
3976 * suspend states, don't set it as disabled.
3978 list_for_each_entry(regulator
, &rdev
->consumer_list
, list
) {
3979 voltage
= ®ulator
->voltage
[state
];
3980 if (voltage
->min_uV
|| voltage
->max_uV
)
3984 return regulator_suspend_toggle(rdev
, state
, false);
3986 EXPORT_SYMBOL_GPL(regulator_suspend_disable
);
3988 static int _regulator_set_suspend_voltage(struct regulator
*regulator
,
3989 int min_uV
, int max_uV
,
3990 suspend_state_t state
)
3992 struct regulator_dev
*rdev
= regulator
->rdev
;
3993 struct regulator_state
*rstate
;
3995 rstate
= regulator_get_suspend_state(rdev
, state
);
3999 if (rstate
->min_uV
== rstate
->max_uV
) {
4000 rdev_err(rdev
, "The suspend voltage can't be changed!\n");
4004 return regulator_set_voltage_unlocked(regulator
, min_uV
, max_uV
, state
);
4007 int regulator_set_suspend_voltage(struct regulator
*regulator
, int min_uV
,
4008 int max_uV
, suspend_state_t state
)
4010 struct ww_acquire_ctx ww_ctx
;
4013 /* PM_SUSPEND_ON is handled by regulator_set_voltage() */
4014 if (regulator_check_states(state
) || state
== PM_SUSPEND_ON
)
4017 regulator_lock_dependent(regulator
->rdev
, &ww_ctx
);
4019 ret
= _regulator_set_suspend_voltage(regulator
, min_uV
,
4022 regulator_unlock_dependent(regulator
->rdev
, &ww_ctx
);
4026 EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage
);
4029 * regulator_set_voltage_time - get raise/fall time
4030 * @regulator: regulator source
4031 * @old_uV: starting voltage in microvolts
4032 * @new_uV: target voltage in microvolts
4034 * Provided with the starting and ending voltage, this function attempts to
4035 * calculate the time in microseconds required to rise or fall to this new
4038 int regulator_set_voltage_time(struct regulator
*regulator
,
4039 int old_uV
, int new_uV
)
4041 struct regulator_dev
*rdev
= regulator
->rdev
;
4042 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
4048 if (ops
->set_voltage_time
)
4049 return ops
->set_voltage_time(rdev
, old_uV
, new_uV
);
4050 else if (!ops
->set_voltage_time_sel
)
4051 return _regulator_set_voltage_time(rdev
, old_uV
, new_uV
);
4053 /* Currently requires operations to do this */
4054 if (!ops
->list_voltage
|| !rdev
->desc
->n_voltages
)
4057 for (i
= 0; i
< rdev
->desc
->n_voltages
; i
++) {
4058 /* We only look for exact voltage matches here */
4059 if (i
< rdev
->desc
->linear_min_sel
)
4062 if (old_sel
>= 0 && new_sel
>= 0)
4065 voltage
= regulator_list_voltage(regulator
, i
);
4070 if (voltage
== old_uV
)
4072 if (voltage
== new_uV
)
4076 if (old_sel
< 0 || new_sel
< 0)
4079 return ops
->set_voltage_time_sel(rdev
, old_sel
, new_sel
);
4081 EXPORT_SYMBOL_GPL(regulator_set_voltage_time
);
4084 * regulator_set_voltage_time_sel - get raise/fall time
4085 * @rdev: regulator source device
4086 * @old_selector: selector for starting voltage
4087 * @new_selector: selector for target voltage
4089 * Provided with the starting and target voltage selectors, this function
4090 * returns time in microseconds required to rise or fall to this new voltage
4092 * Drivers providing ramp_delay in regulation_constraints can use this as their
4093 * set_voltage_time_sel() operation.
4095 int regulator_set_voltage_time_sel(struct regulator_dev
*rdev
,
4096 unsigned int old_selector
,
4097 unsigned int new_selector
)
4099 int old_volt
, new_volt
;
4102 if (!rdev
->desc
->ops
->list_voltage
)
4105 old_volt
= rdev
->desc
->ops
->list_voltage(rdev
, old_selector
);
4106 new_volt
= rdev
->desc
->ops
->list_voltage(rdev
, new_selector
);
4108 if (rdev
->desc
->ops
->set_voltage_time
)
4109 return rdev
->desc
->ops
->set_voltage_time(rdev
, old_volt
,
4112 return _regulator_set_voltage_time(rdev
, old_volt
, new_volt
);
4114 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel
);
4117 * regulator_sync_voltage - re-apply last regulator output voltage
4118 * @regulator: regulator source
4120 * Re-apply the last configured voltage. This is intended to be used
4121 * where some external control source the consumer is cooperating with
4122 * has caused the configured voltage to change.
4124 int regulator_sync_voltage(struct regulator
*regulator
)
4126 struct regulator_dev
*rdev
= regulator
->rdev
;
4127 struct regulator_voltage
*voltage
= ®ulator
->voltage
[PM_SUSPEND_ON
];
4128 int ret
, min_uV
, max_uV
;
4130 regulator_lock(rdev
);
4132 if (!rdev
->desc
->ops
->set_voltage
&&
4133 !rdev
->desc
->ops
->set_voltage_sel
) {
4138 /* This is only going to work if we've had a voltage configured. */
4139 if (!voltage
->min_uV
&& !voltage
->max_uV
) {
4144 min_uV
= voltage
->min_uV
;
4145 max_uV
= voltage
->max_uV
;
4147 /* This should be a paranoia check... */
4148 ret
= regulator_check_voltage(rdev
, &min_uV
, &max_uV
);
4152 ret
= regulator_check_consumers(rdev
, &min_uV
, &max_uV
, 0);
4156 ret
= _regulator_do_set_voltage(rdev
, min_uV
, max_uV
);
4159 regulator_unlock(rdev
);
4162 EXPORT_SYMBOL_GPL(regulator_sync_voltage
);
4164 int regulator_get_voltage_rdev(struct regulator_dev
*rdev
)
4169 if (rdev
->desc
->ops
->get_bypass
) {
4170 ret
= rdev
->desc
->ops
->get_bypass(rdev
, &bypassed
);
4174 /* if bypassed the regulator must have a supply */
4175 if (!rdev
->supply
) {
4177 "bypassed regulator has no supply!\n");
4178 return -EPROBE_DEFER
;
4181 return regulator_get_voltage_rdev(rdev
->supply
->rdev
);
4185 if (rdev
->desc
->ops
->get_voltage_sel
) {
4186 sel
= rdev
->desc
->ops
->get_voltage_sel(rdev
);
4189 ret
= rdev
->desc
->ops
->list_voltage(rdev
, sel
);
4190 } else if (rdev
->desc
->ops
->get_voltage
) {
4191 ret
= rdev
->desc
->ops
->get_voltage(rdev
);
4192 } else if (rdev
->desc
->ops
->list_voltage
) {
4193 ret
= rdev
->desc
->ops
->list_voltage(rdev
, 0);
4194 } else if (rdev
->desc
->fixed_uV
&& (rdev
->desc
->n_voltages
== 1)) {
4195 ret
= rdev
->desc
->fixed_uV
;
4196 } else if (rdev
->supply
) {
4197 ret
= regulator_get_voltage_rdev(rdev
->supply
->rdev
);
4198 } else if (rdev
->supply_name
) {
4199 return -EPROBE_DEFER
;
4206 return ret
- rdev
->constraints
->uV_offset
;
4208 EXPORT_SYMBOL_GPL(regulator_get_voltage_rdev
);
4211 * regulator_get_voltage - get regulator output voltage
4212 * @regulator: regulator source
4214 * This returns the current regulator voltage in uV.
4216 * NOTE: If the regulator is disabled it will return the voltage value. This
4217 * function should not be used to determine regulator state.
4219 int regulator_get_voltage(struct regulator
*regulator
)
4221 struct ww_acquire_ctx ww_ctx
;
4224 regulator_lock_dependent(regulator
->rdev
, &ww_ctx
);
4225 ret
= regulator_get_voltage_rdev(regulator
->rdev
);
4226 regulator_unlock_dependent(regulator
->rdev
, &ww_ctx
);
4230 EXPORT_SYMBOL_GPL(regulator_get_voltage
);
4233 * regulator_set_current_limit - set regulator output current limit
4234 * @regulator: regulator source
4235 * @min_uA: Minimum supported current in uA
4236 * @max_uA: Maximum supported current in uA
4238 * Sets current sink to the desired output current. This can be set during
4239 * any regulator state. IOW, regulator can be disabled or enabled.
4241 * If the regulator is enabled then the current will change to the new value
4242 * immediately otherwise if the regulator is disabled the regulator will
4243 * output at the new current when enabled.
4245 * NOTE: Regulator system constraints must be set for this regulator before
4246 * calling this function otherwise this call will fail.
4248 int regulator_set_current_limit(struct regulator
*regulator
,
4249 int min_uA
, int max_uA
)
4251 struct regulator_dev
*rdev
= regulator
->rdev
;
4254 regulator_lock(rdev
);
4257 if (!rdev
->desc
->ops
->set_current_limit
) {
4262 /* constraints check */
4263 ret
= regulator_check_current_limit(rdev
, &min_uA
, &max_uA
);
4267 ret
= rdev
->desc
->ops
->set_current_limit(rdev
, min_uA
, max_uA
);
4269 regulator_unlock(rdev
);
4272 EXPORT_SYMBOL_GPL(regulator_set_current_limit
);
4274 static int _regulator_get_current_limit_unlocked(struct regulator_dev
*rdev
)
4277 if (!rdev
->desc
->ops
->get_current_limit
)
4280 return rdev
->desc
->ops
->get_current_limit(rdev
);
4283 static int _regulator_get_current_limit(struct regulator_dev
*rdev
)
4287 regulator_lock(rdev
);
4288 ret
= _regulator_get_current_limit_unlocked(rdev
);
4289 regulator_unlock(rdev
);
4295 * regulator_get_current_limit - get regulator output current
4296 * @regulator: regulator source
4298 * This returns the current supplied by the specified current sink in uA.
4300 * NOTE: If the regulator is disabled it will return the current value. This
4301 * function should not be used to determine regulator state.
4303 int regulator_get_current_limit(struct regulator
*regulator
)
4305 return _regulator_get_current_limit(regulator
->rdev
);
4307 EXPORT_SYMBOL_GPL(regulator_get_current_limit
);
4310 * regulator_set_mode - set regulator operating mode
4311 * @regulator: regulator source
4312 * @mode: operating mode - one of the REGULATOR_MODE constants
4314 * Set regulator operating mode to increase regulator efficiency or improve
4315 * regulation performance.
4317 * NOTE: Regulator system constraints must be set for this regulator before
4318 * calling this function otherwise this call will fail.
4320 int regulator_set_mode(struct regulator
*regulator
, unsigned int mode
)
4322 struct regulator_dev
*rdev
= regulator
->rdev
;
4324 int regulator_curr_mode
;
4326 regulator_lock(rdev
);
4329 if (!rdev
->desc
->ops
->set_mode
) {
4334 /* return if the same mode is requested */
4335 if (rdev
->desc
->ops
->get_mode
) {
4336 regulator_curr_mode
= rdev
->desc
->ops
->get_mode(rdev
);
4337 if (regulator_curr_mode
== mode
) {
4343 /* constraints check */
4344 ret
= regulator_mode_constrain(rdev
, &mode
);
4348 ret
= rdev
->desc
->ops
->set_mode(rdev
, mode
);
4350 regulator_unlock(rdev
);
4353 EXPORT_SYMBOL_GPL(regulator_set_mode
);
4355 static unsigned int _regulator_get_mode_unlocked(struct regulator_dev
*rdev
)
4358 if (!rdev
->desc
->ops
->get_mode
)
4361 return rdev
->desc
->ops
->get_mode(rdev
);
4364 static unsigned int _regulator_get_mode(struct regulator_dev
*rdev
)
4368 regulator_lock(rdev
);
4369 ret
= _regulator_get_mode_unlocked(rdev
);
4370 regulator_unlock(rdev
);
4376 * regulator_get_mode - get regulator operating mode
4377 * @regulator: regulator source
4379 * Get the current regulator operating mode.
4381 unsigned int regulator_get_mode(struct regulator
*regulator
)
4383 return _regulator_get_mode(regulator
->rdev
);
4385 EXPORT_SYMBOL_GPL(regulator_get_mode
);
4387 static int _regulator_get_error_flags(struct regulator_dev
*rdev
,
4388 unsigned int *flags
)
4392 regulator_lock(rdev
);
4395 if (!rdev
->desc
->ops
->get_error_flags
) {
4400 ret
= rdev
->desc
->ops
->get_error_flags(rdev
, flags
);
4402 regulator_unlock(rdev
);
4407 * regulator_get_error_flags - get regulator error information
4408 * @regulator: regulator source
4409 * @flags: pointer to store error flags
4411 * Get the current regulator error information.
4413 int regulator_get_error_flags(struct regulator
*regulator
,
4414 unsigned int *flags
)
4416 return _regulator_get_error_flags(regulator
->rdev
, flags
);
4418 EXPORT_SYMBOL_GPL(regulator_get_error_flags
);
4421 * regulator_set_load - set regulator load
4422 * @regulator: regulator source
4423 * @uA_load: load current
4425 * Notifies the regulator core of a new device load. This is then used by
4426 * DRMS (if enabled by constraints) to set the most efficient regulator
4427 * operating mode for the new regulator loading.
4429 * Consumer devices notify their supply regulator of the maximum power
4430 * they will require (can be taken from device datasheet in the power
4431 * consumption tables) when they change operational status and hence power
4432 * state. Examples of operational state changes that can affect power
4433 * consumption are :-
4435 * o Device is opened / closed.
4436 * o Device I/O is about to begin or has just finished.
4437 * o Device is idling in between work.
4439 * This information is also exported via sysfs to userspace.
4441 * DRMS will sum the total requested load on the regulator and change
4442 * to the most efficient operating mode if platform constraints allow.
4444 * NOTE: when a regulator consumer requests to have a regulator
4445 * disabled then any load that consumer requested no longer counts
4446 * toward the total requested load. If the regulator is re-enabled
4447 * then the previously requested load will start counting again.
4449 * If a regulator is an always-on regulator then an individual consumer's
4450 * load will still be removed if that consumer is fully disabled.
4452 * On error a negative errno is returned.
4454 int regulator_set_load(struct regulator
*regulator
, int uA_load
)
4456 struct regulator_dev
*rdev
= regulator
->rdev
;
4460 regulator_lock(rdev
);
4461 old_uA_load
= regulator
->uA_load
;
4462 regulator
->uA_load
= uA_load
;
4463 if (regulator
->enable_count
&& old_uA_load
!= uA_load
) {
4464 ret
= drms_uA_update(rdev
);
4466 regulator
->uA_load
= old_uA_load
;
4468 regulator_unlock(rdev
);
4472 EXPORT_SYMBOL_GPL(regulator_set_load
);
4475 * regulator_allow_bypass - allow the regulator to go into bypass mode
4477 * @regulator: Regulator to configure
4478 * @enable: enable or disable bypass mode
4480 * Allow the regulator to go into bypass mode if all other consumers
4481 * for the regulator also enable bypass mode and the machine
4482 * constraints allow this. Bypass mode means that the regulator is
4483 * simply passing the input directly to the output with no regulation.
4485 int regulator_allow_bypass(struct regulator
*regulator
, bool enable
)
4487 struct regulator_dev
*rdev
= regulator
->rdev
;
4488 const char *name
= rdev_get_name(rdev
);
4491 if (!rdev
->desc
->ops
->set_bypass
)
4494 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_BYPASS
))
4497 regulator_lock(rdev
);
4499 if (enable
&& !regulator
->bypass
) {
4500 rdev
->bypass_count
++;
4502 if (rdev
->bypass_count
== rdev
->open_count
) {
4503 trace_regulator_bypass_enable(name
);
4505 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
4507 rdev
->bypass_count
--;
4509 trace_regulator_bypass_enable_complete(name
);
4512 } else if (!enable
&& regulator
->bypass
) {
4513 rdev
->bypass_count
--;
4515 if (rdev
->bypass_count
!= rdev
->open_count
) {
4516 trace_regulator_bypass_disable(name
);
4518 ret
= rdev
->desc
->ops
->set_bypass(rdev
, enable
);
4520 rdev
->bypass_count
++;
4522 trace_regulator_bypass_disable_complete(name
);
4527 regulator
->bypass
= enable
;
4529 regulator_unlock(rdev
);
4533 EXPORT_SYMBOL_GPL(regulator_allow_bypass
);
4536 * regulator_register_notifier - register regulator event notifier
4537 * @regulator: regulator source
4538 * @nb: notifier block
4540 * Register notifier block to receive regulator events.
4542 int regulator_register_notifier(struct regulator
*regulator
,
4543 struct notifier_block
*nb
)
4545 return blocking_notifier_chain_register(®ulator
->rdev
->notifier
,
4548 EXPORT_SYMBOL_GPL(regulator_register_notifier
);
4551 * regulator_unregister_notifier - unregister regulator event notifier
4552 * @regulator: regulator source
4553 * @nb: notifier block
4555 * Unregister regulator event notifier block.
4557 int regulator_unregister_notifier(struct regulator
*regulator
,
4558 struct notifier_block
*nb
)
4560 return blocking_notifier_chain_unregister(®ulator
->rdev
->notifier
,
4563 EXPORT_SYMBOL_GPL(regulator_unregister_notifier
);
4565 /* notify regulator consumers and downstream regulator consumers.
4566 * Note mutex must be held by caller.
4568 static int _notifier_call_chain(struct regulator_dev
*rdev
,
4569 unsigned long event
, void *data
)
4571 /* call rdev chain first */
4572 return blocking_notifier_call_chain(&rdev
->notifier
, event
, data
);
4576 * regulator_bulk_get - get multiple regulator consumers
4578 * @dev: Device to supply
4579 * @num_consumers: Number of consumers to register
4580 * @consumers: Configuration of consumers; clients are stored here.
4582 * @return 0 on success, an errno on failure.
4584 * This helper function allows drivers to get several regulator
4585 * consumers in one operation. If any of the regulators cannot be
4586 * acquired then any regulators that were allocated will be freed
4587 * before returning to the caller.
4589 int regulator_bulk_get(struct device
*dev
, int num_consumers
,
4590 struct regulator_bulk_data
*consumers
)
4595 for (i
= 0; i
< num_consumers
; i
++)
4596 consumers
[i
].consumer
= NULL
;
4598 for (i
= 0; i
< num_consumers
; i
++) {
4599 consumers
[i
].consumer
= regulator_get(dev
,
4600 consumers
[i
].supply
);
4601 if (IS_ERR(consumers
[i
].consumer
)) {
4602 ret
= PTR_ERR(consumers
[i
].consumer
);
4603 consumers
[i
].consumer
= NULL
;
4611 if (ret
!= -EPROBE_DEFER
)
4612 dev_err(dev
, "Failed to get supply '%s': %pe\n",
4613 consumers
[i
].supply
, ERR_PTR(ret
));
4615 dev_dbg(dev
, "Failed to get supply '%s', deferring\n",
4616 consumers
[i
].supply
);
4619 regulator_put(consumers
[i
].consumer
);
4623 EXPORT_SYMBOL_GPL(regulator_bulk_get
);
4625 static void regulator_bulk_enable_async(void *data
, async_cookie_t cookie
)
4627 struct regulator_bulk_data
*bulk
= data
;
4629 bulk
->ret
= regulator_enable(bulk
->consumer
);
4633 * regulator_bulk_enable - enable multiple regulator consumers
4635 * @num_consumers: Number of consumers
4636 * @consumers: Consumer data; clients are stored here.
4637 * @return 0 on success, an errno on failure
4639 * This convenience API allows consumers to enable multiple regulator
4640 * clients in a single API call. If any consumers cannot be enabled
4641 * then any others that were enabled will be disabled again prior to
4644 int regulator_bulk_enable(int num_consumers
,
4645 struct regulator_bulk_data
*consumers
)
4647 ASYNC_DOMAIN_EXCLUSIVE(async_domain
);
4651 for (i
= 0; i
< num_consumers
; i
++) {
4652 async_schedule_domain(regulator_bulk_enable_async
,
4653 &consumers
[i
], &async_domain
);
4656 async_synchronize_full_domain(&async_domain
);
4658 /* If any consumer failed we need to unwind any that succeeded */
4659 for (i
= 0; i
< num_consumers
; i
++) {
4660 if (consumers
[i
].ret
!= 0) {
4661 ret
= consumers
[i
].ret
;
4669 for (i
= 0; i
< num_consumers
; i
++) {
4670 if (consumers
[i
].ret
< 0)
4671 pr_err("Failed to enable %s: %pe\n", consumers
[i
].supply
,
4672 ERR_PTR(consumers
[i
].ret
));
4674 regulator_disable(consumers
[i
].consumer
);
4679 EXPORT_SYMBOL_GPL(regulator_bulk_enable
);
4682 * regulator_bulk_disable - disable multiple regulator consumers
4684 * @num_consumers: Number of consumers
4685 * @consumers: Consumer data; clients are stored here.
4686 * @return 0 on success, an errno on failure
4688 * This convenience API allows consumers to disable multiple regulator
4689 * clients in a single API call. If any consumers cannot be disabled
4690 * then any others that were disabled will be enabled again prior to
4693 int regulator_bulk_disable(int num_consumers
,
4694 struct regulator_bulk_data
*consumers
)
4699 for (i
= num_consumers
- 1; i
>= 0; --i
) {
4700 ret
= regulator_disable(consumers
[i
].consumer
);
4708 pr_err("Failed to disable %s: %pe\n", consumers
[i
].supply
, ERR_PTR(ret
));
4709 for (++i
; i
< num_consumers
; ++i
) {
4710 r
= regulator_enable(consumers
[i
].consumer
);
4712 pr_err("Failed to re-enable %s: %pe\n",
4713 consumers
[i
].supply
, ERR_PTR(r
));
4718 EXPORT_SYMBOL_GPL(regulator_bulk_disable
);
4721 * regulator_bulk_force_disable - force disable multiple regulator consumers
4723 * @num_consumers: Number of consumers
4724 * @consumers: Consumer data; clients are stored here.
4725 * @return 0 on success, an errno on failure
4727 * This convenience API allows consumers to forcibly disable multiple regulator
4728 * clients in a single API call.
4729 * NOTE: This should be used for situations when device damage will
4730 * likely occur if the regulators are not disabled (e.g. over temp).
4731 * Although regulator_force_disable function call for some consumers can
4732 * return error numbers, the function is called for all consumers.
4734 int regulator_bulk_force_disable(int num_consumers
,
4735 struct regulator_bulk_data
*consumers
)
4740 for (i
= 0; i
< num_consumers
; i
++) {
4742 regulator_force_disable(consumers
[i
].consumer
);
4744 /* Store first error for reporting */
4745 if (consumers
[i
].ret
&& !ret
)
4746 ret
= consumers
[i
].ret
;
4751 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable
);
4754 * regulator_bulk_free - free multiple regulator consumers
4756 * @num_consumers: Number of consumers
4757 * @consumers: Consumer data; clients are stored here.
4759 * This convenience API allows consumers to free multiple regulator
4760 * clients in a single API call.
4762 void regulator_bulk_free(int num_consumers
,
4763 struct regulator_bulk_data
*consumers
)
4767 for (i
= 0; i
< num_consumers
; i
++) {
4768 regulator_put(consumers
[i
].consumer
);
4769 consumers
[i
].consumer
= NULL
;
4772 EXPORT_SYMBOL_GPL(regulator_bulk_free
);
4775 * regulator_notifier_call_chain - call regulator event notifier
4776 * @rdev: regulator source
4777 * @event: notifier block
4778 * @data: callback-specific data.
4780 * Called by regulator drivers to notify clients a regulator event has
4783 int regulator_notifier_call_chain(struct regulator_dev
*rdev
,
4784 unsigned long event
, void *data
)
4786 _notifier_call_chain(rdev
, event
, data
);
4790 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain
);
4793 * regulator_mode_to_status - convert a regulator mode into a status
4795 * @mode: Mode to convert
4797 * Convert a regulator mode into a status.
4799 int regulator_mode_to_status(unsigned int mode
)
4802 case REGULATOR_MODE_FAST
:
4803 return REGULATOR_STATUS_FAST
;
4804 case REGULATOR_MODE_NORMAL
:
4805 return REGULATOR_STATUS_NORMAL
;
4806 case REGULATOR_MODE_IDLE
:
4807 return REGULATOR_STATUS_IDLE
;
4808 case REGULATOR_MODE_STANDBY
:
4809 return REGULATOR_STATUS_STANDBY
;
4811 return REGULATOR_STATUS_UNDEFINED
;
4814 EXPORT_SYMBOL_GPL(regulator_mode_to_status
);
4816 static struct attribute
*regulator_dev_attrs
[] = {
4817 &dev_attr_name
.attr
,
4818 &dev_attr_num_users
.attr
,
4819 &dev_attr_type
.attr
,
4820 &dev_attr_microvolts
.attr
,
4821 &dev_attr_microamps
.attr
,
4822 &dev_attr_opmode
.attr
,
4823 &dev_attr_state
.attr
,
4824 &dev_attr_status
.attr
,
4825 &dev_attr_bypass
.attr
,
4826 &dev_attr_requested_microamps
.attr
,
4827 &dev_attr_min_microvolts
.attr
,
4828 &dev_attr_max_microvolts
.attr
,
4829 &dev_attr_min_microamps
.attr
,
4830 &dev_attr_max_microamps
.attr
,
4831 &dev_attr_suspend_standby_state
.attr
,
4832 &dev_attr_suspend_mem_state
.attr
,
4833 &dev_attr_suspend_disk_state
.attr
,
4834 &dev_attr_suspend_standby_microvolts
.attr
,
4835 &dev_attr_suspend_mem_microvolts
.attr
,
4836 &dev_attr_suspend_disk_microvolts
.attr
,
4837 &dev_attr_suspend_standby_mode
.attr
,
4838 &dev_attr_suspend_mem_mode
.attr
,
4839 &dev_attr_suspend_disk_mode
.attr
,
4844 * To avoid cluttering sysfs (and memory) with useless state, only
4845 * create attributes that can be meaningfully displayed.
4847 static umode_t
regulator_attr_is_visible(struct kobject
*kobj
,
4848 struct attribute
*attr
, int idx
)
4850 struct device
*dev
= kobj_to_dev(kobj
);
4851 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4852 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
4853 umode_t mode
= attr
->mode
;
4855 /* these three are always present */
4856 if (attr
== &dev_attr_name
.attr
||
4857 attr
== &dev_attr_num_users
.attr
||
4858 attr
== &dev_attr_type
.attr
)
4861 /* some attributes need specific methods to be displayed */
4862 if (attr
== &dev_attr_microvolts
.attr
) {
4863 if ((ops
->get_voltage
&& ops
->get_voltage(rdev
) >= 0) ||
4864 (ops
->get_voltage_sel
&& ops
->get_voltage_sel(rdev
) >= 0) ||
4865 (ops
->list_voltage
&& ops
->list_voltage(rdev
, 0) >= 0) ||
4866 (rdev
->desc
->fixed_uV
&& rdev
->desc
->n_voltages
== 1))
4871 if (attr
== &dev_attr_microamps
.attr
)
4872 return ops
->get_current_limit
? mode
: 0;
4874 if (attr
== &dev_attr_opmode
.attr
)
4875 return ops
->get_mode
? mode
: 0;
4877 if (attr
== &dev_attr_state
.attr
)
4878 return (rdev
->ena_pin
|| ops
->is_enabled
) ? mode
: 0;
4880 if (attr
== &dev_attr_status
.attr
)
4881 return ops
->get_status
? mode
: 0;
4883 if (attr
== &dev_attr_bypass
.attr
)
4884 return ops
->get_bypass
? mode
: 0;
4886 /* constraints need specific supporting methods */
4887 if (attr
== &dev_attr_min_microvolts
.attr
||
4888 attr
== &dev_attr_max_microvolts
.attr
)
4889 return (ops
->set_voltage
|| ops
->set_voltage_sel
) ? mode
: 0;
4891 if (attr
== &dev_attr_min_microamps
.attr
||
4892 attr
== &dev_attr_max_microamps
.attr
)
4893 return ops
->set_current_limit
? mode
: 0;
4895 if (attr
== &dev_attr_suspend_standby_state
.attr
||
4896 attr
== &dev_attr_suspend_mem_state
.attr
||
4897 attr
== &dev_attr_suspend_disk_state
.attr
)
4900 if (attr
== &dev_attr_suspend_standby_microvolts
.attr
||
4901 attr
== &dev_attr_suspend_mem_microvolts
.attr
||
4902 attr
== &dev_attr_suspend_disk_microvolts
.attr
)
4903 return ops
->set_suspend_voltage
? mode
: 0;
4905 if (attr
== &dev_attr_suspend_standby_mode
.attr
||
4906 attr
== &dev_attr_suspend_mem_mode
.attr
||
4907 attr
== &dev_attr_suspend_disk_mode
.attr
)
4908 return ops
->set_suspend_mode
? mode
: 0;
4913 static const struct attribute_group regulator_dev_group
= {
4914 .attrs
= regulator_dev_attrs
,
4915 .is_visible
= regulator_attr_is_visible
,
4918 static const struct attribute_group
*regulator_dev_groups
[] = {
4919 ®ulator_dev_group
,
4923 static void regulator_dev_release(struct device
*dev
)
4925 struct regulator_dev
*rdev
= dev_get_drvdata(dev
);
4927 kfree(rdev
->constraints
);
4928 of_node_put(rdev
->dev
.of_node
);
4932 static void rdev_init_debugfs(struct regulator_dev
*rdev
)
4934 struct device
*parent
= rdev
->dev
.parent
;
4935 const char *rname
= rdev_get_name(rdev
);
4936 char name
[NAME_MAX
];
4938 /* Avoid duplicate debugfs directory names */
4939 if (parent
&& rname
== rdev
->desc
->name
) {
4940 snprintf(name
, sizeof(name
), "%s-%s", dev_name(parent
),
4945 rdev
->debugfs
= debugfs_create_dir(rname
, debugfs_root
);
4946 if (!rdev
->debugfs
) {
4947 rdev_warn(rdev
, "Failed to create debugfs directory\n");
4951 debugfs_create_u32("use_count", 0444, rdev
->debugfs
,
4953 debugfs_create_u32("open_count", 0444, rdev
->debugfs
,
4955 debugfs_create_u32("bypass_count", 0444, rdev
->debugfs
,
4956 &rdev
->bypass_count
);
4959 static int regulator_register_resolve_supply(struct device
*dev
, void *data
)
4961 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
4963 if (regulator_resolve_supply(rdev
))
4964 rdev_dbg(rdev
, "unable to resolve supply\n");
4969 int regulator_coupler_register(struct regulator_coupler
*coupler
)
4971 mutex_lock(®ulator_list_mutex
);
4972 list_add_tail(&coupler
->list
, ®ulator_coupler_list
);
4973 mutex_unlock(®ulator_list_mutex
);
4978 static struct regulator_coupler
*
4979 regulator_find_coupler(struct regulator_dev
*rdev
)
4981 struct regulator_coupler
*coupler
;
4985 * Note that regulators are appended to the list and the generic
4986 * coupler is registered first, hence it will be attached at last
4989 list_for_each_entry_reverse(coupler
, ®ulator_coupler_list
, list
) {
4990 err
= coupler
->attach_regulator(coupler
, rdev
);
4992 if (!coupler
->balance_voltage
&&
4993 rdev
->coupling_desc
.n_coupled
> 2)
4994 goto err_unsupported
;
5000 return ERR_PTR(err
);
5008 return ERR_PTR(-EINVAL
);
5011 if (coupler
->detach_regulator
)
5012 coupler
->detach_regulator(coupler
, rdev
);
5015 "Voltage balancing for multiple regulator couples is unimplemented\n");
5017 return ERR_PTR(-EPERM
);
5020 static void regulator_resolve_coupling(struct regulator_dev
*rdev
)
5022 struct regulator_coupler
*coupler
= rdev
->coupling_desc
.coupler
;
5023 struct coupling_desc
*c_desc
= &rdev
->coupling_desc
;
5024 int n_coupled
= c_desc
->n_coupled
;
5025 struct regulator_dev
*c_rdev
;
5028 for (i
= 1; i
< n_coupled
; i
++) {
5029 /* already resolved */
5030 if (c_desc
->coupled_rdevs
[i
])
5033 c_rdev
= of_parse_coupled_regulator(rdev
, i
- 1);
5038 if (c_rdev
->coupling_desc
.coupler
!= coupler
) {
5039 rdev_err(rdev
, "coupler mismatch with %s\n",
5040 rdev_get_name(c_rdev
));
5044 c_desc
->coupled_rdevs
[i
] = c_rdev
;
5045 c_desc
->n_resolved
++;
5047 regulator_resolve_coupling(c_rdev
);
5051 static void regulator_remove_coupling(struct regulator_dev
*rdev
)
5053 struct regulator_coupler
*coupler
= rdev
->coupling_desc
.coupler
;
5054 struct coupling_desc
*__c_desc
, *c_desc
= &rdev
->coupling_desc
;
5055 struct regulator_dev
*__c_rdev
, *c_rdev
;
5056 unsigned int __n_coupled
, n_coupled
;
5060 n_coupled
= c_desc
->n_coupled
;
5062 for (i
= 1; i
< n_coupled
; i
++) {
5063 c_rdev
= c_desc
->coupled_rdevs
[i
];
5068 regulator_lock(c_rdev
);
5070 __c_desc
= &c_rdev
->coupling_desc
;
5071 __n_coupled
= __c_desc
->n_coupled
;
5073 for (k
= 1; k
< __n_coupled
; k
++) {
5074 __c_rdev
= __c_desc
->coupled_rdevs
[k
];
5076 if (__c_rdev
== rdev
) {
5077 __c_desc
->coupled_rdevs
[k
] = NULL
;
5078 __c_desc
->n_resolved
--;
5083 regulator_unlock(c_rdev
);
5085 c_desc
->coupled_rdevs
[i
] = NULL
;
5086 c_desc
->n_resolved
--;
5089 if (coupler
&& coupler
->detach_regulator
) {
5090 err
= coupler
->detach_regulator(coupler
, rdev
);
5092 rdev_err(rdev
, "failed to detach from coupler: %pe\n",
5096 kfree(rdev
->coupling_desc
.coupled_rdevs
);
5097 rdev
->coupling_desc
.coupled_rdevs
= NULL
;
5100 static int regulator_init_coupling(struct regulator_dev
*rdev
)
5102 struct regulator_dev
**coupled
;
5103 int err
, n_phandles
;
5105 if (!IS_ENABLED(CONFIG_OF
))
5108 n_phandles
= of_get_n_coupled(rdev
);
5110 coupled
= kcalloc(n_phandles
+ 1, sizeof(*coupled
), GFP_KERNEL
);
5114 rdev
->coupling_desc
.coupled_rdevs
= coupled
;
5117 * Every regulator should always have coupling descriptor filled with
5118 * at least pointer to itself.
5120 rdev
->coupling_desc
.coupled_rdevs
[0] = rdev
;
5121 rdev
->coupling_desc
.n_coupled
= n_phandles
+ 1;
5122 rdev
->coupling_desc
.n_resolved
++;
5124 /* regulator isn't coupled */
5125 if (n_phandles
== 0)
5128 if (!of_check_coupling_data(rdev
))
5131 mutex_lock(®ulator_list_mutex
);
5132 rdev
->coupling_desc
.coupler
= regulator_find_coupler(rdev
);
5133 mutex_unlock(®ulator_list_mutex
);
5135 if (IS_ERR(rdev
->coupling_desc
.coupler
)) {
5136 err
= PTR_ERR(rdev
->coupling_desc
.coupler
);
5137 rdev_err(rdev
, "failed to get coupler: %pe\n", ERR_PTR(err
));
5144 static int generic_coupler_attach(struct regulator_coupler
*coupler
,
5145 struct regulator_dev
*rdev
)
5147 if (rdev
->coupling_desc
.n_coupled
> 2) {
5149 "Voltage balancing for multiple regulator couples is unimplemented\n");
5153 if (!rdev
->constraints
->always_on
) {
5155 "Coupling of a non always-on regulator is unimplemented\n");
5162 static struct regulator_coupler generic_regulator_coupler
= {
5163 .attach_regulator
= generic_coupler_attach
,
5167 * regulator_register - register regulator
5168 * @regulator_desc: regulator to register
5169 * @cfg: runtime configuration for regulator
5171 * Called by regulator drivers to register a regulator.
5172 * Returns a valid pointer to struct regulator_dev on success
5173 * or an ERR_PTR() on error.
5175 struct regulator_dev
*
5176 regulator_register(const struct regulator_desc
*regulator_desc
,
5177 const struct regulator_config
*cfg
)
5179 const struct regulator_init_data
*init_data
;
5180 struct regulator_config
*config
= NULL
;
5181 static atomic_t regulator_no
= ATOMIC_INIT(-1);
5182 struct regulator_dev
*rdev
;
5183 bool dangling_cfg_gpiod
= false;
5184 bool dangling_of_gpiod
= false;
5189 return ERR_PTR(-EINVAL
);
5191 dangling_cfg_gpiod
= true;
5192 if (regulator_desc
== NULL
) {
5200 if (regulator_desc
->name
== NULL
|| regulator_desc
->ops
== NULL
) {
5205 if (regulator_desc
->type
!= REGULATOR_VOLTAGE
&&
5206 regulator_desc
->type
!= REGULATOR_CURRENT
) {
5211 /* Only one of each should be implemented */
5212 WARN_ON(regulator_desc
->ops
->get_voltage
&&
5213 regulator_desc
->ops
->get_voltage_sel
);
5214 WARN_ON(regulator_desc
->ops
->set_voltage
&&
5215 regulator_desc
->ops
->set_voltage_sel
);
5217 /* If we're using selectors we must implement list_voltage. */
5218 if (regulator_desc
->ops
->get_voltage_sel
&&
5219 !regulator_desc
->ops
->list_voltage
) {
5223 if (regulator_desc
->ops
->set_voltage_sel
&&
5224 !regulator_desc
->ops
->list_voltage
) {
5229 rdev
= kzalloc(sizeof(struct regulator_dev
), GFP_KERNEL
);
5234 device_initialize(&rdev
->dev
);
5237 * Duplicate the config so the driver could override it after
5238 * parsing init data.
5240 config
= kmemdup(cfg
, sizeof(*cfg
), GFP_KERNEL
);
5241 if (config
== NULL
) {
5246 init_data
= regulator_of_get_init_data(dev
, regulator_desc
, config
,
5247 &rdev
->dev
.of_node
);
5250 * Sometimes not all resources are probed already so we need to take
5251 * that into account. This happens most the time if the ena_gpiod comes
5252 * from a gpio extender or something else.
5254 if (PTR_ERR(init_data
) == -EPROBE_DEFER
) {
5255 ret
= -EPROBE_DEFER
;
5260 * We need to keep track of any GPIO descriptor coming from the
5261 * device tree until we have handled it over to the core. If the
5262 * config that was passed in to this function DOES NOT contain
5263 * a descriptor, and the config after this call DOES contain
5264 * a descriptor, we definitely got one from parsing the device
5267 if (!cfg
->ena_gpiod
&& config
->ena_gpiod
)
5268 dangling_of_gpiod
= true;
5270 init_data
= config
->init_data
;
5271 rdev
->dev
.of_node
= of_node_get(config
->of_node
);
5274 ww_mutex_init(&rdev
->mutex
, ®ulator_ww_class
);
5275 rdev
->reg_data
= config
->driver_data
;
5276 rdev
->owner
= regulator_desc
->owner
;
5277 rdev
->desc
= regulator_desc
;
5279 rdev
->regmap
= config
->regmap
;
5280 else if (dev_get_regmap(dev
, NULL
))
5281 rdev
->regmap
= dev_get_regmap(dev
, NULL
);
5282 else if (dev
->parent
)
5283 rdev
->regmap
= dev_get_regmap(dev
->parent
, NULL
);
5284 INIT_LIST_HEAD(&rdev
->consumer_list
);
5285 INIT_LIST_HEAD(&rdev
->list
);
5286 BLOCKING_INIT_NOTIFIER_HEAD(&rdev
->notifier
);
5287 INIT_DELAYED_WORK(&rdev
->disable_work
, regulator_disable_work
);
5289 /* preform any regulator specific init */
5290 if (init_data
&& init_data
->regulator_init
) {
5291 ret
= init_data
->regulator_init(rdev
->reg_data
);
5296 if (config
->ena_gpiod
) {
5297 ret
= regulator_ena_gpio_request(rdev
, config
);
5299 rdev_err(rdev
, "Failed to request enable GPIO: %pe\n",
5303 /* The regulator core took over the GPIO descriptor */
5304 dangling_cfg_gpiod
= false;
5305 dangling_of_gpiod
= false;
5308 /* register with sysfs */
5309 rdev
->dev
.class = ®ulator_class
;
5310 rdev
->dev
.parent
= dev
;
5311 dev_set_name(&rdev
->dev
, "regulator.%lu",
5312 (unsigned long) atomic_inc_return(®ulator_no
));
5313 dev_set_drvdata(&rdev
->dev
, rdev
);
5315 /* set regulator constraints */
5317 rdev
->constraints
= kmemdup(&init_data
->constraints
,
5318 sizeof(*rdev
->constraints
),
5321 rdev
->constraints
= kzalloc(sizeof(*rdev
->constraints
),
5323 if (!rdev
->constraints
) {
5328 if (init_data
&& init_data
->supply_regulator
)
5329 rdev
->supply_name
= init_data
->supply_regulator
;
5330 else if (regulator_desc
->supply_name
)
5331 rdev
->supply_name
= regulator_desc
->supply_name
;
5333 ret
= set_machine_constraints(rdev
);
5334 if (ret
== -EPROBE_DEFER
) {
5335 /* Regulator might be in bypass mode and so needs its supply
5336 * to set the constraints */
5337 /* FIXME: this currently triggers a chicken-and-egg problem
5338 * when creating -SUPPLY symlink in sysfs to a regulator
5339 * that is just being created */
5340 rdev_dbg(rdev
, "will resolve supply early: %s\n",
5342 ret
= regulator_resolve_supply(rdev
);
5344 ret
= set_machine_constraints(rdev
);
5346 rdev_dbg(rdev
, "unable to resolve supply early: %pe\n",
5352 ret
= regulator_init_coupling(rdev
);
5356 /* add consumers devices */
5358 for (i
= 0; i
< init_data
->num_consumer_supplies
; i
++) {
5359 ret
= set_consumer_device_supply(rdev
,
5360 init_data
->consumer_supplies
[i
].dev_name
,
5361 init_data
->consumer_supplies
[i
].supply
);
5363 dev_err(dev
, "Failed to set supply %s\n",
5364 init_data
->consumer_supplies
[i
].supply
);
5365 goto unset_supplies
;
5370 if (!rdev
->desc
->ops
->get_voltage
&&
5371 !rdev
->desc
->ops
->list_voltage
&&
5372 !rdev
->desc
->fixed_uV
)
5373 rdev
->is_switch
= true;
5375 ret
= device_add(&rdev
->dev
);
5377 goto unset_supplies
;
5379 rdev_init_debugfs(rdev
);
5381 /* try to resolve regulators coupling since a new one was registered */
5382 mutex_lock(®ulator_list_mutex
);
5383 regulator_resolve_coupling(rdev
);
5384 mutex_unlock(®ulator_list_mutex
);
5386 /* try to resolve regulators supply since a new one was registered */
5387 class_for_each_device(®ulator_class
, NULL
, NULL
,
5388 regulator_register_resolve_supply
);
5393 mutex_lock(®ulator_list_mutex
);
5394 unset_regulator_supplies(rdev
);
5395 regulator_remove_coupling(rdev
);
5396 mutex_unlock(®ulator_list_mutex
);
5398 kfree(rdev
->coupling_desc
.coupled_rdevs
);
5399 mutex_lock(®ulator_list_mutex
);
5400 regulator_ena_gpio_free(rdev
);
5401 mutex_unlock(®ulator_list_mutex
);
5403 if (dangling_of_gpiod
)
5404 gpiod_put(config
->ena_gpiod
);
5406 put_device(&rdev
->dev
);
5408 if (dangling_cfg_gpiod
)
5409 gpiod_put(cfg
->ena_gpiod
);
5410 return ERR_PTR(ret
);
5412 EXPORT_SYMBOL_GPL(regulator_register
);
5415 * regulator_unregister - unregister regulator
5416 * @rdev: regulator to unregister
5418 * Called by regulator drivers to unregister a regulator.
5420 void regulator_unregister(struct regulator_dev
*rdev
)
5426 while (rdev
->use_count
--)
5427 regulator_disable(rdev
->supply
);
5428 regulator_put(rdev
->supply
);
5431 flush_work(&rdev
->disable_work
.work
);
5433 mutex_lock(®ulator_list_mutex
);
5435 debugfs_remove_recursive(rdev
->debugfs
);
5436 WARN_ON(rdev
->open_count
);
5437 regulator_remove_coupling(rdev
);
5438 unset_regulator_supplies(rdev
);
5439 list_del(&rdev
->list
);
5440 regulator_ena_gpio_free(rdev
);
5441 device_unregister(&rdev
->dev
);
5443 mutex_unlock(®ulator_list_mutex
);
5445 EXPORT_SYMBOL_GPL(regulator_unregister
);
5447 #ifdef CONFIG_SUSPEND
5449 * regulator_suspend - prepare regulators for system wide suspend
5450 * @dev: ``&struct device`` pointer that is passed to _regulator_suspend()
5452 * Configure each regulator with it's suspend operating parameters for state.
5454 static int regulator_suspend(struct device
*dev
)
5456 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
5457 suspend_state_t state
= pm_suspend_target_state
;
5459 const struct regulator_state
*rstate
;
5461 rstate
= regulator_get_suspend_state_check(rdev
, state
);
5465 regulator_lock(rdev
);
5466 ret
= __suspend_set_state(rdev
, rstate
);
5467 regulator_unlock(rdev
);
5472 static int regulator_resume(struct device
*dev
)
5474 suspend_state_t state
= pm_suspend_target_state
;
5475 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
5476 struct regulator_state
*rstate
;
5479 rstate
= regulator_get_suspend_state(rdev
, state
);
5483 /* Avoid grabbing the lock if we don't need to */
5484 if (!rdev
->desc
->ops
->resume
)
5487 regulator_lock(rdev
);
5489 if (rstate
->enabled
== ENABLE_IN_SUSPEND
||
5490 rstate
->enabled
== DISABLE_IN_SUSPEND
)
5491 ret
= rdev
->desc
->ops
->resume(rdev
);
5493 regulator_unlock(rdev
);
5497 #else /* !CONFIG_SUSPEND */
5499 #define regulator_suspend NULL
5500 #define regulator_resume NULL
5502 #endif /* !CONFIG_SUSPEND */
5505 static const struct dev_pm_ops __maybe_unused regulator_pm_ops
= {
5506 .suspend
= regulator_suspend
,
5507 .resume
= regulator_resume
,
5511 struct class regulator_class
= {
5512 .name
= "regulator",
5513 .dev_release
= regulator_dev_release
,
5514 .dev_groups
= regulator_dev_groups
,
5516 .pm
= ®ulator_pm_ops
,
5520 * regulator_has_full_constraints - the system has fully specified constraints
5522 * Calling this function will cause the regulator API to disable all
5523 * regulators which have a zero use count and don't have an always_on
5524 * constraint in a late_initcall.
5526 * The intention is that this will become the default behaviour in a
5527 * future kernel release so users are encouraged to use this facility
5530 void regulator_has_full_constraints(void)
5532 has_full_constraints
= 1;
5534 EXPORT_SYMBOL_GPL(regulator_has_full_constraints
);
5537 * rdev_get_drvdata - get rdev regulator driver data
5540 * Get rdev regulator driver private data. This call can be used in the
5541 * regulator driver context.
5543 void *rdev_get_drvdata(struct regulator_dev
*rdev
)
5545 return rdev
->reg_data
;
5547 EXPORT_SYMBOL_GPL(rdev_get_drvdata
);
5550 * regulator_get_drvdata - get regulator driver data
5551 * @regulator: regulator
5553 * Get regulator driver private data. This call can be used in the consumer
5554 * driver context when non API regulator specific functions need to be called.
5556 void *regulator_get_drvdata(struct regulator
*regulator
)
5558 return regulator
->rdev
->reg_data
;
5560 EXPORT_SYMBOL_GPL(regulator_get_drvdata
);
5563 * regulator_set_drvdata - set regulator driver data
5564 * @regulator: regulator
5567 void regulator_set_drvdata(struct regulator
*regulator
, void *data
)
5569 regulator
->rdev
->reg_data
= data
;
5571 EXPORT_SYMBOL_GPL(regulator_set_drvdata
);
5574 * rdev_get_id - get regulator ID
5577 int rdev_get_id(struct regulator_dev
*rdev
)
5579 return rdev
->desc
->id
;
5581 EXPORT_SYMBOL_GPL(rdev_get_id
);
5583 struct device
*rdev_get_dev(struct regulator_dev
*rdev
)
5587 EXPORT_SYMBOL_GPL(rdev_get_dev
);
5589 struct regmap
*rdev_get_regmap(struct regulator_dev
*rdev
)
5591 return rdev
->regmap
;
5593 EXPORT_SYMBOL_GPL(rdev_get_regmap
);
5595 void *regulator_get_init_drvdata(struct regulator_init_data
*reg_init_data
)
5597 return reg_init_data
->driver_data
;
5599 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata
);
5601 #ifdef CONFIG_DEBUG_FS
5602 static int supply_map_show(struct seq_file
*sf
, void *data
)
5604 struct regulator_map
*map
;
5606 list_for_each_entry(map
, ®ulator_map_list
, list
) {
5607 seq_printf(sf
, "%s -> %s.%s\n",
5608 rdev_get_name(map
->regulator
), map
->dev_name
,
5614 DEFINE_SHOW_ATTRIBUTE(supply_map
);
5616 struct summary_data
{
5618 struct regulator_dev
*parent
;
5622 static void regulator_summary_show_subtree(struct seq_file
*s
,
5623 struct regulator_dev
*rdev
,
5626 static int regulator_summary_show_children(struct device
*dev
, void *data
)
5628 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
5629 struct summary_data
*summary_data
= data
;
5631 if (rdev
->supply
&& rdev
->supply
->rdev
== summary_data
->parent
)
5632 regulator_summary_show_subtree(summary_data
->s
, rdev
,
5633 summary_data
->level
+ 1);
5638 static void regulator_summary_show_subtree(struct seq_file
*s
,
5639 struct regulator_dev
*rdev
,
5642 struct regulation_constraints
*c
;
5643 struct regulator
*consumer
;
5644 struct summary_data summary_data
;
5645 unsigned int opmode
;
5650 opmode
= _regulator_get_mode_unlocked(rdev
);
5651 seq_printf(s
, "%*s%-*s %3d %4d %6d %7s ",
5653 30 - level
* 3, rdev_get_name(rdev
),
5654 rdev
->use_count
, rdev
->open_count
, rdev
->bypass_count
,
5655 regulator_opmode_to_str(opmode
));
5657 seq_printf(s
, "%5dmV ", regulator_get_voltage_rdev(rdev
) / 1000);
5658 seq_printf(s
, "%5dmA ",
5659 _regulator_get_current_limit_unlocked(rdev
) / 1000);
5661 c
= rdev
->constraints
;
5663 switch (rdev
->desc
->type
) {
5664 case REGULATOR_VOLTAGE
:
5665 seq_printf(s
, "%5dmV %5dmV ",
5666 c
->min_uV
/ 1000, c
->max_uV
/ 1000);
5668 case REGULATOR_CURRENT
:
5669 seq_printf(s
, "%5dmA %5dmA ",
5670 c
->min_uA
/ 1000, c
->max_uA
/ 1000);
5677 list_for_each_entry(consumer
, &rdev
->consumer_list
, list
) {
5678 if (consumer
->dev
&& consumer
->dev
->class == ®ulator_class
)
5681 seq_printf(s
, "%*s%-*s ",
5682 (level
+ 1) * 3 + 1, "",
5683 30 - (level
+ 1) * 3,
5684 consumer
->supply_name
? consumer
->supply_name
:
5685 consumer
->dev
? dev_name(consumer
->dev
) : "deviceless");
5687 switch (rdev
->desc
->type
) {
5688 case REGULATOR_VOLTAGE
:
5689 seq_printf(s
, "%3d %33dmA%c%5dmV %5dmV",
5690 consumer
->enable_count
,
5691 consumer
->uA_load
/ 1000,
5692 consumer
->uA_load
&& !consumer
->enable_count
?
5694 consumer
->voltage
[PM_SUSPEND_ON
].min_uV
/ 1000,
5695 consumer
->voltage
[PM_SUSPEND_ON
].max_uV
/ 1000);
5697 case REGULATOR_CURRENT
:
5705 summary_data
.level
= level
;
5706 summary_data
.parent
= rdev
;
5708 class_for_each_device(®ulator_class
, NULL
, &summary_data
,
5709 regulator_summary_show_children
);
5712 struct summary_lock_data
{
5713 struct ww_acquire_ctx
*ww_ctx
;
5714 struct regulator_dev
**new_contended_rdev
;
5715 struct regulator_dev
**old_contended_rdev
;
5718 static int regulator_summary_lock_one(struct device
*dev
, void *data
)
5720 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
5721 struct summary_lock_data
*lock_data
= data
;
5724 if (rdev
!= *lock_data
->old_contended_rdev
) {
5725 ret
= regulator_lock_nested(rdev
, lock_data
->ww_ctx
);
5727 if (ret
== -EDEADLK
)
5728 *lock_data
->new_contended_rdev
= rdev
;
5732 *lock_data
->old_contended_rdev
= NULL
;
5738 static int regulator_summary_unlock_one(struct device
*dev
, void *data
)
5740 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
5741 struct summary_lock_data
*lock_data
= data
;
5744 if (rdev
== *lock_data
->new_contended_rdev
)
5748 regulator_unlock(rdev
);
5753 static int regulator_summary_lock_all(struct ww_acquire_ctx
*ww_ctx
,
5754 struct regulator_dev
**new_contended_rdev
,
5755 struct regulator_dev
**old_contended_rdev
)
5757 struct summary_lock_data lock_data
;
5760 lock_data
.ww_ctx
= ww_ctx
;
5761 lock_data
.new_contended_rdev
= new_contended_rdev
;
5762 lock_data
.old_contended_rdev
= old_contended_rdev
;
5764 ret
= class_for_each_device(®ulator_class
, NULL
, &lock_data
,
5765 regulator_summary_lock_one
);
5767 class_for_each_device(®ulator_class
, NULL
, &lock_data
,
5768 regulator_summary_unlock_one
);
5773 static void regulator_summary_lock(struct ww_acquire_ctx
*ww_ctx
)
5775 struct regulator_dev
*new_contended_rdev
= NULL
;
5776 struct regulator_dev
*old_contended_rdev
= NULL
;
5779 mutex_lock(®ulator_list_mutex
);
5781 ww_acquire_init(ww_ctx
, ®ulator_ww_class
);
5784 if (new_contended_rdev
) {
5785 ww_mutex_lock_slow(&new_contended_rdev
->mutex
, ww_ctx
);
5786 old_contended_rdev
= new_contended_rdev
;
5787 old_contended_rdev
->ref_cnt
++;
5790 err
= regulator_summary_lock_all(ww_ctx
,
5791 &new_contended_rdev
,
5792 &old_contended_rdev
);
5794 if (old_contended_rdev
)
5795 regulator_unlock(old_contended_rdev
);
5797 } while (err
== -EDEADLK
);
5799 ww_acquire_done(ww_ctx
);
5802 static void regulator_summary_unlock(struct ww_acquire_ctx
*ww_ctx
)
5804 class_for_each_device(®ulator_class
, NULL
, NULL
,
5805 regulator_summary_unlock_one
);
5806 ww_acquire_fini(ww_ctx
);
5808 mutex_unlock(®ulator_list_mutex
);
5811 static int regulator_summary_show_roots(struct device
*dev
, void *data
)
5813 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
5814 struct seq_file
*s
= data
;
5817 regulator_summary_show_subtree(s
, rdev
, 0);
5822 static int regulator_summary_show(struct seq_file
*s
, void *data
)
5824 struct ww_acquire_ctx ww_ctx
;
5826 seq_puts(s
, " regulator use open bypass opmode voltage current min max\n");
5827 seq_puts(s
, "---------------------------------------------------------------------------------------\n");
5829 regulator_summary_lock(&ww_ctx
);
5831 class_for_each_device(®ulator_class
, NULL
, s
,
5832 regulator_summary_show_roots
);
5834 regulator_summary_unlock(&ww_ctx
);
5838 DEFINE_SHOW_ATTRIBUTE(regulator_summary
);
5839 #endif /* CONFIG_DEBUG_FS */
5841 static int __init
regulator_init(void)
5845 ret
= class_register(®ulator_class
);
5847 debugfs_root
= debugfs_create_dir("regulator", NULL
);
5849 pr_warn("regulator: Failed to create debugfs directory\n");
5851 #ifdef CONFIG_DEBUG_FS
5852 debugfs_create_file("supply_map", 0444, debugfs_root
, NULL
,
5855 debugfs_create_file("regulator_summary", 0444, debugfs_root
,
5856 NULL
, ®ulator_summary_fops
);
5858 regulator_dummy_init();
5860 regulator_coupler_register(&generic_regulator_coupler
);
5865 /* init early to allow our consumers to complete system booting */
5866 core_initcall(regulator_init
);
5868 static int regulator_late_cleanup(struct device
*dev
, void *data
)
5870 struct regulator_dev
*rdev
= dev_to_rdev(dev
);
5871 const struct regulator_ops
*ops
= rdev
->desc
->ops
;
5872 struct regulation_constraints
*c
= rdev
->constraints
;
5875 if (c
&& c
->always_on
)
5878 if (!regulator_ops_is_valid(rdev
, REGULATOR_CHANGE_STATUS
))
5881 regulator_lock(rdev
);
5883 if (rdev
->use_count
)
5886 /* If we can't read the status assume it's always on. */
5887 if (ops
->is_enabled
)
5888 enabled
= ops
->is_enabled(rdev
);
5892 /* But if reading the status failed, assume that it's off. */
5896 if (have_full_constraints()) {
5897 /* We log since this may kill the system if it goes
5899 rdev_info(rdev
, "disabling\n");
5900 ret
= _regulator_do_disable(rdev
);
5902 rdev_err(rdev
, "couldn't disable: %pe\n", ERR_PTR(ret
));
5904 /* The intention is that in future we will
5905 * assume that full constraints are provided
5906 * so warn even if we aren't going to do
5909 rdev_warn(rdev
, "incomplete constraints, leaving on\n");
5913 regulator_unlock(rdev
);
5918 static void regulator_init_complete_work_function(struct work_struct
*work
)
5921 * Regulators may had failed to resolve their input supplies
5922 * when were registered, either because the input supply was
5923 * not registered yet or because its parent device was not
5924 * bound yet. So attempt to resolve the input supplies for
5925 * pending regulators before trying to disable unused ones.
5927 class_for_each_device(®ulator_class
, NULL
, NULL
,
5928 regulator_register_resolve_supply
);
5930 /* If we have a full configuration then disable any regulators
5931 * we have permission to change the status for and which are
5932 * not in use or always_on. This is effectively the default
5933 * for DT and ACPI as they have full constraints.
5935 class_for_each_device(®ulator_class
, NULL
, NULL
,
5936 regulator_late_cleanup
);
5939 static DECLARE_DELAYED_WORK(regulator_init_complete_work
,
5940 regulator_init_complete_work_function
);
5942 static int __init
regulator_init_complete(void)
5945 * Since DT doesn't provide an idiomatic mechanism for
5946 * enabling full constraints and since it's much more natural
5947 * with DT to provide them just assume that a DT enabled
5948 * system has full constraints.
5950 if (of_have_populated_dt())
5951 has_full_constraints
= true;
5954 * We punt completion for an arbitrary amount of time since
5955 * systems like distros will load many drivers from userspace
5956 * so consumers might not always be ready yet, this is
5957 * particularly an issue with laptops where this might bounce
5958 * the display off then on. Ideally we'd get a notification
5959 * from userspace when this happens but we don't so just wait
5960 * a bit and hope we waited long enough. It'd be better if
5961 * we'd only do this on systems that need it, and a kernel
5962 * command line option might be useful.
5964 schedule_delayed_work(®ulator_init_complete_work
,
5965 msecs_to_jiffies(30000));
5969 late_initcall_sync(regulator_init_complete
);