2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
27 #include <linux/gpio/consumer.h>
29 #include <linux/regmap.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/module.h>
36 #define CREATE_TRACE_POINTS
37 #include <trace/events/regulator.h>
42 #define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 #define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
53 static DEFINE_MUTEX(regulator_list_mutex);
54 static LIST_HEAD(regulator_map_list);
55 static LIST_HEAD(regulator_ena_gpio_list);
56 static LIST_HEAD(regulator_supply_alias_list);
57 static bool has_full_constraints;
59 static struct dentry *debugfs_root;
62 * struct regulator_map
64 * Used to provide symbolic supply names to devices.
66 struct regulator_map {
67 struct list_head list;
68 const char *dev_name; /* The dev_name() for the consumer */
70 struct regulator_dev *regulator;
74 * struct regulator_enable_gpio
76 * Management for shared enable GPIO pin
78 struct regulator_enable_gpio {
79 struct list_head list;
80 struct gpio_desc *gpiod;
81 u32 enable_count; /* a number of enabled shared GPIO */
82 u32 request_count; /* a number of requested shared GPIO */
83 unsigned int ena_gpio_invert:1;
87 * struct regulator_supply_alias
89 * Used to map lookups for a supply onto an alternative device.
91 struct regulator_supply_alias {
92 struct list_head list;
93 struct device *src_dev;
94 const char *src_supply;
95 struct device *alias_dev;
96 const char *alias_supply;
99 static int _regulator_is_enabled(struct regulator_dev *rdev);
100 static int _regulator_disable(struct regulator_dev *rdev);
101 static int _regulator_get_voltage(struct regulator_dev *rdev);
102 static int _regulator_get_current_limit(struct regulator_dev *rdev);
103 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
104 static int _notifier_call_chain(struct regulator_dev *rdev,
105 unsigned long event, void *data);
106 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
107 int min_uV, int max_uV);
108 static struct regulator *create_regulator(struct regulator_dev *rdev,
110 const char *supply_name);
111 static void _regulator_put(struct regulator *regulator);
113 static const char *rdev_get_name(struct regulator_dev *rdev)
115 if (rdev->constraints && rdev->constraints->name)
116 return rdev->constraints->name;
117 else if (rdev->desc->name)
118 return rdev->desc->name;
123 static bool have_full_constraints(void)
125 return has_full_constraints || of_have_populated_dt();
128 static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops)
130 if (!rdev->constraints) {
131 rdev_err(rdev, "no constraints\n");
135 if (rdev->constraints->valid_ops_mask & ops)
141 static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev)
143 if (rdev && rdev->supply)
144 return rdev->supply->rdev;
150 * regulator_lock_nested - lock a single regulator
151 * @rdev: regulator source
152 * @subclass: mutex subclass used for lockdep
154 * This function can be called many times by one task on
155 * a single regulator and its mutex will be locked only
156 * once. If a task, which is calling this function is other
157 * than the one, which initially locked the mutex, it will
160 static void regulator_lock_nested(struct regulator_dev *rdev,
161 unsigned int subclass)
163 if (!mutex_trylock(&rdev->mutex)) {
164 if (rdev->mutex_owner == current) {
168 mutex_lock_nested(&rdev->mutex, subclass);
172 rdev->mutex_owner = current;
175 static inline void regulator_lock(struct regulator_dev *rdev)
177 regulator_lock_nested(rdev, 0);
181 * regulator_unlock - unlock a single regulator
182 * @rdev: regulator_source
184 * This function unlocks the mutex when the
185 * reference counter reaches 0.
187 static void regulator_unlock(struct regulator_dev *rdev)
189 if (rdev->ref_cnt != 0) {
192 if (!rdev->ref_cnt) {
193 rdev->mutex_owner = NULL;
194 mutex_unlock(&rdev->mutex);
200 * regulator_lock_supply - lock a regulator and its supplies
201 * @rdev: regulator source
203 static void regulator_lock_supply(struct regulator_dev *rdev)
207 for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++)
208 regulator_lock_nested(rdev, i);
212 * regulator_unlock_supply - unlock a regulator and its supplies
213 * @rdev: regulator source
215 static void regulator_unlock_supply(struct regulator_dev *rdev)
217 struct regulator *supply;
220 regulator_unlock(rdev);
221 supply = rdev->supply;
231 * of_get_regulator - get a regulator device node based on supply name
232 * @dev: Device pointer for the consumer (of regulator) device
233 * @supply: regulator supply name
235 * Extract the regulator device node corresponding to the supply name.
236 * returns the device node corresponding to the regulator if found, else
239 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
241 struct device_node *regnode = NULL;
242 char prop_name[32]; /* 32 is max size of property name */
244 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
246 snprintf(prop_name, 32, "%s-supply", supply);
247 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
250 dev_dbg(dev, "Looking up %s property in node %pOF failed\n",
251 prop_name, dev->of_node);
257 /* Platform voltage constraint check */
258 static int regulator_check_voltage(struct regulator_dev *rdev,
259 int *min_uV, int *max_uV)
261 BUG_ON(*min_uV > *max_uV);
263 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
264 rdev_err(rdev, "voltage operation not allowed\n");
268 if (*max_uV > rdev->constraints->max_uV)
269 *max_uV = rdev->constraints->max_uV;
270 if (*min_uV < rdev->constraints->min_uV)
271 *min_uV = rdev->constraints->min_uV;
273 if (*min_uV > *max_uV) {
274 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
282 /* return 0 if the state is valid */
283 static int regulator_check_states(suspend_state_t state)
285 return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE);
288 /* Make sure we select a voltage that suits the needs of all
289 * regulator consumers
291 static int regulator_check_consumers(struct regulator_dev *rdev,
292 int *min_uV, int *max_uV,
293 suspend_state_t state)
295 struct regulator *regulator;
296 struct regulator_voltage *voltage;
298 list_for_each_entry(regulator, &rdev->consumer_list, list) {
299 voltage = ®ulator->voltage[state];
301 * Assume consumers that didn't say anything are OK
302 * with anything in the constraint range.
304 if (!voltage->min_uV && !voltage->max_uV)
307 if (*max_uV > voltage->max_uV)
308 *max_uV = voltage->max_uV;
309 if (*min_uV < voltage->min_uV)
310 *min_uV = voltage->min_uV;
313 if (*min_uV > *max_uV) {
314 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
322 /* current constraint check */
323 static int regulator_check_current_limit(struct regulator_dev *rdev,
324 int *min_uA, int *max_uA)
326 BUG_ON(*min_uA > *max_uA);
328 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) {
329 rdev_err(rdev, "current operation not allowed\n");
333 if (*max_uA > rdev->constraints->max_uA)
334 *max_uA = rdev->constraints->max_uA;
335 if (*min_uA < rdev->constraints->min_uA)
336 *min_uA = rdev->constraints->min_uA;
338 if (*min_uA > *max_uA) {
339 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
347 /* operating mode constraint check */
348 static int regulator_mode_constrain(struct regulator_dev *rdev,
352 case REGULATOR_MODE_FAST:
353 case REGULATOR_MODE_NORMAL:
354 case REGULATOR_MODE_IDLE:
355 case REGULATOR_MODE_STANDBY:
358 rdev_err(rdev, "invalid mode %x specified\n", *mode);
362 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) {
363 rdev_err(rdev, "mode operation not allowed\n");
367 /* The modes are bitmasks, the most power hungry modes having
368 * the lowest values. If the requested mode isn't supported
369 * try higher modes. */
371 if (rdev->constraints->valid_modes_mask & *mode)
379 static inline struct regulator_state *
380 regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state)
382 if (rdev->constraints == NULL)
386 case PM_SUSPEND_STANDBY:
387 return &rdev->constraints->state_standby;
389 return &rdev->constraints->state_mem;
391 return &rdev->constraints->state_disk;
397 static ssize_t regulator_uV_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
400 struct regulator_dev *rdev = dev_get_drvdata(dev);
403 regulator_lock(rdev);
404 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
405 regulator_unlock(rdev);
409 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
411 static ssize_t regulator_uA_show(struct device *dev,
412 struct device_attribute *attr, char *buf)
414 struct regulator_dev *rdev = dev_get_drvdata(dev);
416 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
418 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
420 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
423 struct regulator_dev *rdev = dev_get_drvdata(dev);
425 return sprintf(buf, "%s\n", rdev_get_name(rdev));
427 static DEVICE_ATTR_RO(name);
429 static ssize_t regulator_print_opmode(char *buf, int mode)
432 case REGULATOR_MODE_FAST:
433 return sprintf(buf, "fast\n");
434 case REGULATOR_MODE_NORMAL:
435 return sprintf(buf, "normal\n");
436 case REGULATOR_MODE_IDLE:
437 return sprintf(buf, "idle\n");
438 case REGULATOR_MODE_STANDBY:
439 return sprintf(buf, "standby\n");
441 return sprintf(buf, "unknown\n");
444 static ssize_t regulator_opmode_show(struct device *dev,
445 struct device_attribute *attr, char *buf)
447 struct regulator_dev *rdev = dev_get_drvdata(dev);
449 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
451 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
453 static ssize_t regulator_print_state(char *buf, int state)
456 return sprintf(buf, "enabled\n");
458 return sprintf(buf, "disabled\n");
460 return sprintf(buf, "unknown\n");
463 static ssize_t regulator_state_show(struct device *dev,
464 struct device_attribute *attr, char *buf)
466 struct regulator_dev *rdev = dev_get_drvdata(dev);
469 regulator_lock(rdev);
470 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
471 regulator_unlock(rdev);
475 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
477 static ssize_t regulator_status_show(struct device *dev,
478 struct device_attribute *attr, char *buf)
480 struct regulator_dev *rdev = dev_get_drvdata(dev);
484 status = rdev->desc->ops->get_status(rdev);
489 case REGULATOR_STATUS_OFF:
492 case REGULATOR_STATUS_ON:
495 case REGULATOR_STATUS_ERROR:
498 case REGULATOR_STATUS_FAST:
501 case REGULATOR_STATUS_NORMAL:
504 case REGULATOR_STATUS_IDLE:
507 case REGULATOR_STATUS_STANDBY:
510 case REGULATOR_STATUS_BYPASS:
513 case REGULATOR_STATUS_UNDEFINED:
520 return sprintf(buf, "%s\n", label);
522 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
524 static ssize_t regulator_min_uA_show(struct device *dev,
525 struct device_attribute *attr, char *buf)
527 struct regulator_dev *rdev = dev_get_drvdata(dev);
529 if (!rdev->constraints)
530 return sprintf(buf, "constraint not defined\n");
532 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
534 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
536 static ssize_t regulator_max_uA_show(struct device *dev,
537 struct device_attribute *attr, char *buf)
539 struct regulator_dev *rdev = dev_get_drvdata(dev);
541 if (!rdev->constraints)
542 return sprintf(buf, "constraint not defined\n");
544 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
546 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
548 static ssize_t regulator_min_uV_show(struct device *dev,
549 struct device_attribute *attr, char *buf)
551 struct regulator_dev *rdev = dev_get_drvdata(dev);
553 if (!rdev->constraints)
554 return sprintf(buf, "constraint not defined\n");
556 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
558 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
560 static ssize_t regulator_max_uV_show(struct device *dev,
561 struct device_attribute *attr, char *buf)
563 struct regulator_dev *rdev = dev_get_drvdata(dev);
565 if (!rdev->constraints)
566 return sprintf(buf, "constraint not defined\n");
568 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
570 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
572 static ssize_t regulator_total_uA_show(struct device *dev,
573 struct device_attribute *attr, char *buf)
575 struct regulator_dev *rdev = dev_get_drvdata(dev);
576 struct regulator *regulator;
579 regulator_lock(rdev);
580 list_for_each_entry(regulator, &rdev->consumer_list, list)
581 uA += regulator->uA_load;
582 regulator_unlock(rdev);
583 return sprintf(buf, "%d\n", uA);
585 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
587 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
590 struct regulator_dev *rdev = dev_get_drvdata(dev);
591 return sprintf(buf, "%d\n", rdev->use_count);
593 static DEVICE_ATTR_RO(num_users);
595 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
598 struct regulator_dev *rdev = dev_get_drvdata(dev);
600 switch (rdev->desc->type) {
601 case REGULATOR_VOLTAGE:
602 return sprintf(buf, "voltage\n");
603 case REGULATOR_CURRENT:
604 return sprintf(buf, "current\n");
606 return sprintf(buf, "unknown\n");
608 static DEVICE_ATTR_RO(type);
610 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
611 struct device_attribute *attr, char *buf)
613 struct regulator_dev *rdev = dev_get_drvdata(dev);
615 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
617 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
618 regulator_suspend_mem_uV_show, NULL);
620 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
621 struct device_attribute *attr, char *buf)
623 struct regulator_dev *rdev = dev_get_drvdata(dev);
625 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
627 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
628 regulator_suspend_disk_uV_show, NULL);
630 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
631 struct device_attribute *attr, char *buf)
633 struct regulator_dev *rdev = dev_get_drvdata(dev);
635 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
637 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
638 regulator_suspend_standby_uV_show, NULL);
640 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
641 struct device_attribute *attr, char *buf)
643 struct regulator_dev *rdev = dev_get_drvdata(dev);
645 return regulator_print_opmode(buf,
646 rdev->constraints->state_mem.mode);
648 static DEVICE_ATTR(suspend_mem_mode, 0444,
649 regulator_suspend_mem_mode_show, NULL);
651 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
652 struct device_attribute *attr, char *buf)
654 struct regulator_dev *rdev = dev_get_drvdata(dev);
656 return regulator_print_opmode(buf,
657 rdev->constraints->state_disk.mode);
659 static DEVICE_ATTR(suspend_disk_mode, 0444,
660 regulator_suspend_disk_mode_show, NULL);
662 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
663 struct device_attribute *attr, char *buf)
665 struct regulator_dev *rdev = dev_get_drvdata(dev);
667 return regulator_print_opmode(buf,
668 rdev->constraints->state_standby.mode);
670 static DEVICE_ATTR(suspend_standby_mode, 0444,
671 regulator_suspend_standby_mode_show, NULL);
673 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
674 struct device_attribute *attr, char *buf)
676 struct regulator_dev *rdev = dev_get_drvdata(dev);
678 return regulator_print_state(buf,
679 rdev->constraints->state_mem.enabled);
681 static DEVICE_ATTR(suspend_mem_state, 0444,
682 regulator_suspend_mem_state_show, NULL);
684 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
685 struct device_attribute *attr, char *buf)
687 struct regulator_dev *rdev = dev_get_drvdata(dev);
689 return regulator_print_state(buf,
690 rdev->constraints->state_disk.enabled);
692 static DEVICE_ATTR(suspend_disk_state, 0444,
693 regulator_suspend_disk_state_show, NULL);
695 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
696 struct device_attribute *attr, char *buf)
698 struct regulator_dev *rdev = dev_get_drvdata(dev);
700 return regulator_print_state(buf,
701 rdev->constraints->state_standby.enabled);
703 static DEVICE_ATTR(suspend_standby_state, 0444,
704 regulator_suspend_standby_state_show, NULL);
706 static ssize_t regulator_bypass_show(struct device *dev,
707 struct device_attribute *attr, char *buf)
709 struct regulator_dev *rdev = dev_get_drvdata(dev);
714 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
723 return sprintf(buf, "%s\n", report);
725 static DEVICE_ATTR(bypass, 0444,
726 regulator_bypass_show, NULL);
728 /* Calculate the new optimum regulator operating mode based on the new total
729 * consumer load. All locks held by caller */
730 static int drms_uA_update(struct regulator_dev *rdev)
732 struct regulator *sibling;
733 int current_uA = 0, output_uV, input_uV, err;
736 lockdep_assert_held_once(&rdev->mutex);
739 * first check to see if we can set modes at all, otherwise just
740 * tell the consumer everything is OK.
742 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
745 if (!rdev->desc->ops->get_optimum_mode &&
746 !rdev->desc->ops->set_load)
749 if (!rdev->desc->ops->set_mode &&
750 !rdev->desc->ops->set_load)
753 /* calc total requested load */
754 list_for_each_entry(sibling, &rdev->consumer_list, list)
755 current_uA += sibling->uA_load;
757 current_uA += rdev->constraints->system_load;
759 if (rdev->desc->ops->set_load) {
760 /* set the optimum mode for our new total regulator load */
761 err = rdev->desc->ops->set_load(rdev, current_uA);
763 rdev_err(rdev, "failed to set load %d\n", current_uA);
765 /* get output voltage */
766 output_uV = _regulator_get_voltage(rdev);
767 if (output_uV <= 0) {
768 rdev_err(rdev, "invalid output voltage found\n");
772 /* get input voltage */
775 input_uV = regulator_get_voltage(rdev->supply);
777 input_uV = rdev->constraints->input_uV;
779 rdev_err(rdev, "invalid input voltage found\n");
783 /* now get the optimum mode for our new total regulator load */
784 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
785 output_uV, current_uA);
787 /* check the new mode is allowed */
788 err = regulator_mode_constrain(rdev, &mode);
790 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
791 current_uA, input_uV, output_uV);
795 err = rdev->desc->ops->set_mode(rdev, mode);
797 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
803 static int suspend_set_state(struct regulator_dev *rdev,
804 suspend_state_t state)
807 struct regulator_state *rstate;
809 rstate = regulator_get_suspend_state(rdev, state);
813 /* If we have no suspend mode configration don't set anything;
814 * only warn if the driver implements set_suspend_voltage or
815 * set_suspend_mode callback.
817 if (rstate->enabled != ENABLE_IN_SUSPEND &&
818 rstate->enabled != DISABLE_IN_SUSPEND) {
819 if (rdev->desc->ops->set_suspend_voltage ||
820 rdev->desc->ops->set_suspend_mode)
821 rdev_warn(rdev, "No configuration\n");
825 if (rstate->enabled == ENABLE_IN_SUSPEND &&
826 rdev->desc->ops->set_suspend_enable)
827 ret = rdev->desc->ops->set_suspend_enable(rdev);
828 else if (rstate->enabled == DISABLE_IN_SUSPEND &&
829 rdev->desc->ops->set_suspend_disable)
830 ret = rdev->desc->ops->set_suspend_disable(rdev);
831 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
835 rdev_err(rdev, "failed to enabled/disable\n");
839 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
840 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
842 rdev_err(rdev, "failed to set voltage\n");
847 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
848 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
850 rdev_err(rdev, "failed to set mode\n");
858 static void print_constraints(struct regulator_dev *rdev)
860 struct regulation_constraints *constraints = rdev->constraints;
862 size_t len = sizeof(buf) - 1;
866 if (constraints->min_uV && constraints->max_uV) {
867 if (constraints->min_uV == constraints->max_uV)
868 count += scnprintf(buf + count, len - count, "%d mV ",
869 constraints->min_uV / 1000);
871 count += scnprintf(buf + count, len - count,
873 constraints->min_uV / 1000,
874 constraints->max_uV / 1000);
877 if (!constraints->min_uV ||
878 constraints->min_uV != constraints->max_uV) {
879 ret = _regulator_get_voltage(rdev);
881 count += scnprintf(buf + count, len - count,
882 "at %d mV ", ret / 1000);
885 if (constraints->uV_offset)
886 count += scnprintf(buf + count, len - count, "%dmV offset ",
887 constraints->uV_offset / 1000);
889 if (constraints->min_uA && constraints->max_uA) {
890 if (constraints->min_uA == constraints->max_uA)
891 count += scnprintf(buf + count, len - count, "%d mA ",
892 constraints->min_uA / 1000);
894 count += scnprintf(buf + count, len - count,
896 constraints->min_uA / 1000,
897 constraints->max_uA / 1000);
900 if (!constraints->min_uA ||
901 constraints->min_uA != constraints->max_uA) {
902 ret = _regulator_get_current_limit(rdev);
904 count += scnprintf(buf + count, len - count,
905 "at %d mA ", ret / 1000);
908 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
909 count += scnprintf(buf + count, len - count, "fast ");
910 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
911 count += scnprintf(buf + count, len - count, "normal ");
912 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
913 count += scnprintf(buf + count, len - count, "idle ");
914 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
915 count += scnprintf(buf + count, len - count, "standby");
918 scnprintf(buf, len, "no parameters");
920 rdev_dbg(rdev, "%s\n", buf);
922 if ((constraints->min_uV != constraints->max_uV) &&
923 !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE))
925 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
928 static int machine_constraints_voltage(struct regulator_dev *rdev,
929 struct regulation_constraints *constraints)
931 const struct regulator_ops *ops = rdev->desc->ops;
934 /* do we need to apply the constraint voltage */
935 if (rdev->constraints->apply_uV &&
936 rdev->constraints->min_uV && rdev->constraints->max_uV) {
937 int target_min, target_max;
938 int current_uV = _regulator_get_voltage(rdev);
940 if (current_uV == -ENOTRECOVERABLE) {
941 /* This regulator can't be read and must be initted */
942 rdev_info(rdev, "Setting %d-%duV\n",
943 rdev->constraints->min_uV,
944 rdev->constraints->max_uV);
945 _regulator_do_set_voltage(rdev,
946 rdev->constraints->min_uV,
947 rdev->constraints->max_uV);
948 current_uV = _regulator_get_voltage(rdev);
951 if (current_uV < 0) {
953 "failed to get the current voltage(%d)\n",
959 * If we're below the minimum voltage move up to the
960 * minimum voltage, if we're above the maximum voltage
961 * then move down to the maximum.
963 target_min = current_uV;
964 target_max = current_uV;
966 if (current_uV < rdev->constraints->min_uV) {
967 target_min = rdev->constraints->min_uV;
968 target_max = rdev->constraints->min_uV;
971 if (current_uV > rdev->constraints->max_uV) {
972 target_min = rdev->constraints->max_uV;
973 target_max = rdev->constraints->max_uV;
976 if (target_min != current_uV || target_max != current_uV) {
977 rdev_info(rdev, "Bringing %duV into %d-%duV\n",
978 current_uV, target_min, target_max);
979 ret = _regulator_do_set_voltage(
980 rdev, target_min, target_max);
983 "failed to apply %d-%duV constraint(%d)\n",
984 target_min, target_max, ret);
990 /* constrain machine-level voltage specs to fit
991 * the actual range supported by this regulator.
993 if (ops->list_voltage && rdev->desc->n_voltages) {
994 int count = rdev->desc->n_voltages;
996 int min_uV = INT_MAX;
997 int max_uV = INT_MIN;
998 int cmin = constraints->min_uV;
999 int cmax = constraints->max_uV;
1001 /* it's safe to autoconfigure fixed-voltage supplies
1002 and the constraints are used by list_voltage. */
1003 if (count == 1 && !cmin) {
1006 constraints->min_uV = cmin;
1007 constraints->max_uV = cmax;
1010 /* voltage constraints are optional */
1011 if ((cmin == 0) && (cmax == 0))
1014 /* else require explicit machine-level constraints */
1015 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
1016 rdev_err(rdev, "invalid voltage constraints\n");
1020 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
1021 for (i = 0; i < count; i++) {
1024 value = ops->list_voltage(rdev, i);
1028 /* maybe adjust [min_uV..max_uV] */
1029 if (value >= cmin && value < min_uV)
1031 if (value <= cmax && value > max_uV)
1035 /* final: [min_uV..max_uV] valid iff constraints valid */
1036 if (max_uV < min_uV) {
1038 "unsupportable voltage constraints %u-%uuV\n",
1043 /* use regulator's subset of machine constraints */
1044 if (constraints->min_uV < min_uV) {
1045 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
1046 constraints->min_uV, min_uV);
1047 constraints->min_uV = min_uV;
1049 if (constraints->max_uV > max_uV) {
1050 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
1051 constraints->max_uV, max_uV);
1052 constraints->max_uV = max_uV;
1059 static int machine_constraints_current(struct regulator_dev *rdev,
1060 struct regulation_constraints *constraints)
1062 const struct regulator_ops *ops = rdev->desc->ops;
1065 if (!constraints->min_uA && !constraints->max_uA)
1068 if (constraints->min_uA > constraints->max_uA) {
1069 rdev_err(rdev, "Invalid current constraints\n");
1073 if (!ops->set_current_limit || !ops->get_current_limit) {
1074 rdev_warn(rdev, "Operation of current configuration missing\n");
1078 /* Set regulator current in constraints range */
1079 ret = ops->set_current_limit(rdev, constraints->min_uA,
1080 constraints->max_uA);
1082 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1089 static int _regulator_do_enable(struct regulator_dev *rdev);
1092 * set_machine_constraints - sets regulator constraints
1093 * @rdev: regulator source
1095 * Allows platform initialisation code to define and constrain
1096 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1097 * Constraints *must* be set by platform code in order for some
1098 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1101 static int set_machine_constraints(struct regulator_dev *rdev)
1104 const struct regulator_ops *ops = rdev->desc->ops;
1106 ret = machine_constraints_voltage(rdev, rdev->constraints);
1110 ret = machine_constraints_current(rdev, rdev->constraints);
1114 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1115 ret = ops->set_input_current_limit(rdev,
1116 rdev->constraints->ilim_uA);
1118 rdev_err(rdev, "failed to set input limit\n");
1123 /* do we need to setup our suspend state */
1124 if (rdev->constraints->initial_state) {
1125 ret = suspend_set_state(rdev, rdev->constraints->initial_state);
1127 rdev_err(rdev, "failed to set suspend state\n");
1132 if (rdev->constraints->initial_mode) {
1133 if (!ops->set_mode) {
1134 rdev_err(rdev, "no set_mode operation\n");
1138 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1140 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1145 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1146 && ops->set_ramp_delay) {
1147 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1149 rdev_err(rdev, "failed to set ramp_delay\n");
1154 if (rdev->constraints->pull_down && ops->set_pull_down) {
1155 ret = ops->set_pull_down(rdev);
1157 rdev_err(rdev, "failed to set pull down\n");
1162 if (rdev->constraints->soft_start && ops->set_soft_start) {
1163 ret = ops->set_soft_start(rdev);
1165 rdev_err(rdev, "failed to set soft start\n");
1170 if (rdev->constraints->over_current_protection
1171 && ops->set_over_current_protection) {
1172 ret = ops->set_over_current_protection(rdev);
1174 rdev_err(rdev, "failed to set over current protection\n");
1179 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1180 bool ad_state = (rdev->constraints->active_discharge ==
1181 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1183 ret = ops->set_active_discharge(rdev, ad_state);
1185 rdev_err(rdev, "failed to set active discharge\n");
1190 /* If the constraints say the regulator should be on at this point
1191 * and we have control then make sure it is enabled.
1193 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1194 /* If we want to enable this regulator, make sure that we know
1195 * the supplying regulator.
1197 if (rdev->supply_name && !rdev->supply)
1198 return -EPROBE_DEFER;
1201 ret = regulator_enable(rdev->supply);
1203 _regulator_put(rdev->supply);
1204 rdev->supply = NULL;
1209 ret = _regulator_do_enable(rdev);
1210 if (ret < 0 && ret != -EINVAL) {
1211 rdev_err(rdev, "failed to enable\n");
1215 if (rdev->constraints->always_on)
1219 print_constraints(rdev);
1224 * set_supply - set regulator supply regulator
1225 * @rdev: regulator name
1226 * @supply_rdev: supply regulator name
1228 * Called by platform initialisation code to set the supply regulator for this
1229 * regulator. This ensures that a regulators supply will also be enabled by the
1230 * core if it's child is enabled.
1232 static int set_supply(struct regulator_dev *rdev,
1233 struct regulator_dev *supply_rdev)
1237 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1239 if (!try_module_get(supply_rdev->owner))
1242 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1243 if (rdev->supply == NULL) {
1247 supply_rdev->open_count++;
1253 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1254 * @rdev: regulator source
1255 * @consumer_dev_name: dev_name() string for device supply applies to
1256 * @supply: symbolic name for supply
1258 * Allows platform initialisation code to map physical regulator
1259 * sources to symbolic names for supplies for use by devices. Devices
1260 * should use these symbolic names to request regulators, avoiding the
1261 * need to provide board-specific regulator names as platform data.
1263 static int set_consumer_device_supply(struct regulator_dev *rdev,
1264 const char *consumer_dev_name,
1267 struct regulator_map *node, *new_node;
1273 if (consumer_dev_name != NULL)
1278 new_node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1279 if (new_node == NULL)
1282 new_node->regulator = rdev;
1283 new_node->supply = supply;
1286 new_node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1287 if (new_node->dev_name == NULL) {
1293 mutex_lock(®ulator_list_mutex);
1294 list_for_each_entry(node, ®ulator_map_list, list) {
1295 if (node->dev_name && consumer_dev_name) {
1296 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1298 } else if (node->dev_name || consumer_dev_name) {
1302 if (strcmp(node->supply, supply) != 0)
1305 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1307 dev_name(&node->regulator->dev),
1308 node->regulator->desc->name,
1310 dev_name(&rdev->dev), rdev_get_name(rdev));
1314 list_add(&new_node->list, ®ulator_map_list);
1315 mutex_unlock(®ulator_list_mutex);
1320 mutex_unlock(®ulator_list_mutex);
1321 kfree(new_node->dev_name);
1326 static void unset_regulator_supplies(struct regulator_dev *rdev)
1328 struct regulator_map *node, *n;
1330 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1331 if (rdev == node->regulator) {
1332 list_del(&node->list);
1333 kfree(node->dev_name);
1339 #ifdef CONFIG_DEBUG_FS
1340 static ssize_t constraint_flags_read_file(struct file *file,
1341 char __user *user_buf,
1342 size_t count, loff_t *ppos)
1344 const struct regulator *regulator = file->private_data;
1345 const struct regulation_constraints *c = regulator->rdev->constraints;
1352 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1356 ret = snprintf(buf, PAGE_SIZE,
1360 "ramp_disable: %u\n"
1363 "over_current_protection: %u\n",
1370 c->over_current_protection);
1372 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1380 static const struct file_operations constraint_flags_fops = {
1381 #ifdef CONFIG_DEBUG_FS
1382 .open = simple_open,
1383 .read = constraint_flags_read_file,
1384 .llseek = default_llseek,
1388 #define REG_STR_SIZE 64
1390 static struct regulator *create_regulator(struct regulator_dev *rdev,
1392 const char *supply_name)
1394 struct regulator *regulator;
1395 char buf[REG_STR_SIZE];
1398 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1399 if (regulator == NULL)
1402 regulator_lock(rdev);
1403 regulator->rdev = rdev;
1404 list_add(®ulator->list, &rdev->consumer_list);
1407 regulator->dev = dev;
1409 /* Add a link to the device sysfs entry */
1410 size = snprintf(buf, REG_STR_SIZE, "%s-%s",
1411 dev->kobj.name, supply_name);
1412 if (size >= REG_STR_SIZE)
1415 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1416 if (regulator->supply_name == NULL)
1419 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1422 rdev_dbg(rdev, "could not add device link %s err %d\n",
1423 dev->kobj.name, err);
1427 regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL);
1428 if (regulator->supply_name == NULL)
1432 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1434 if (!regulator->debugfs) {
1435 rdev_dbg(rdev, "Failed to create debugfs directory\n");
1437 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1438 ®ulator->uA_load);
1439 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1440 ®ulator->voltage[PM_SUSPEND_ON].min_uV);
1441 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1442 ®ulator->voltage[PM_SUSPEND_ON].max_uV);
1443 debugfs_create_file("constraint_flags", 0444,
1444 regulator->debugfs, regulator,
1445 &constraint_flags_fops);
1449 * Check now if the regulator is an always on regulator - if
1450 * it is then we don't need to do nearly so much work for
1451 * enable/disable calls.
1453 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) &&
1454 _regulator_is_enabled(rdev))
1455 regulator->always_on = true;
1457 regulator_unlock(rdev);
1460 list_del(®ulator->list);
1462 regulator_unlock(rdev);
1466 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1468 if (rdev->constraints && rdev->constraints->enable_time)
1469 return rdev->constraints->enable_time;
1470 if (!rdev->desc->ops->enable_time)
1471 return rdev->desc->enable_time;
1472 return rdev->desc->ops->enable_time(rdev);
1475 static struct regulator_supply_alias *regulator_find_supply_alias(
1476 struct device *dev, const char *supply)
1478 struct regulator_supply_alias *map;
1480 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1481 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1487 static void regulator_supply_alias(struct device **dev, const char **supply)
1489 struct regulator_supply_alias *map;
1491 map = regulator_find_supply_alias(*dev, *supply);
1493 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1494 *supply, map->alias_supply,
1495 dev_name(map->alias_dev));
1496 *dev = map->alias_dev;
1497 *supply = map->alias_supply;
1501 static int regulator_match(struct device *dev, const void *data)
1503 struct regulator_dev *r = dev_to_rdev(dev);
1505 return strcmp(rdev_get_name(r), data) == 0;
1508 static struct regulator_dev *regulator_lookup_by_name(const char *name)
1512 dev = class_find_device(®ulator_class, NULL, name, regulator_match);
1514 return dev ? dev_to_rdev(dev) : NULL;
1518 * regulator_dev_lookup - lookup a regulator device.
1519 * @dev: device for regulator "consumer".
1520 * @supply: Supply name or regulator ID.
1522 * If successful, returns a struct regulator_dev that corresponds to the name
1523 * @supply and with the embedded struct device refcount incremented by one.
1524 * The refcount must be dropped by calling put_device().
1525 * On failure one of the following ERR-PTR-encoded values is returned:
1526 * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
1529 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1532 struct regulator_dev *r = NULL;
1533 struct device_node *node;
1534 struct regulator_map *map;
1535 const char *devname = NULL;
1537 regulator_supply_alias(&dev, &supply);
1539 /* first do a dt based lookup */
1540 if (dev && dev->of_node) {
1541 node = of_get_regulator(dev, supply);
1543 r = of_find_regulator_by_node(node);
1548 * We have a node, but there is no device.
1549 * assume it has not registered yet.
1551 return ERR_PTR(-EPROBE_DEFER);
1555 /* if not found, try doing it non-dt way */
1557 devname = dev_name(dev);
1559 mutex_lock(®ulator_list_mutex);
1560 list_for_each_entry(map, ®ulator_map_list, list) {
1561 /* If the mapping has a device set up it must match */
1562 if (map->dev_name &&
1563 (!devname || strcmp(map->dev_name, devname)))
1566 if (strcmp(map->supply, supply) == 0 &&
1567 get_device(&map->regulator->dev)) {
1572 mutex_unlock(®ulator_list_mutex);
1577 r = regulator_lookup_by_name(supply);
1581 return ERR_PTR(-ENODEV);
1584 static int regulator_resolve_supply(struct regulator_dev *rdev)
1586 struct regulator_dev *r;
1587 struct device *dev = rdev->dev.parent;
1590 /* No supply to resovle? */
1591 if (!rdev->supply_name)
1594 /* Supply already resolved? (fast-path without locking contention) */
1598 r = regulator_dev_lookup(dev, rdev->supply_name);
1602 /* Did the lookup explicitly defer for us? */
1603 if (ret == -EPROBE_DEFER)
1606 if (have_full_constraints()) {
1607 r = dummy_regulator_rdev;
1608 get_device(&r->dev);
1610 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1611 rdev->supply_name, rdev->desc->name);
1612 ret = -EPROBE_DEFER;
1618 dev_err(dev, "Supply for %s (%s) resolved to itself\n",
1619 rdev->desc->name, rdev->supply_name);
1620 if (!have_full_constraints()) {
1624 r = dummy_regulator_rdev;
1625 get_device(&r->dev);
1629 * If the supply's parent device is not the same as the
1630 * regulator's parent device, then ensure the parent device
1631 * is bound before we resolve the supply, in case the parent
1632 * device get probe deferred and unregisters the supply.
1634 if (r->dev.parent && r->dev.parent != rdev->dev.parent) {
1635 if (!device_is_bound(r->dev.parent)) {
1636 put_device(&r->dev);
1637 ret = -EPROBE_DEFER;
1642 /* Recursively resolve the supply of the supply */
1643 ret = regulator_resolve_supply(r);
1645 put_device(&r->dev);
1650 * Recheck rdev->supply with rdev->mutex lock held to avoid a race
1651 * between rdev->supply null check and setting rdev->supply in
1652 * set_supply() from concurrent tasks.
1654 regulator_lock(rdev);
1656 /* Supply just resolved by a concurrent task? */
1658 regulator_unlock(rdev);
1659 put_device(&r->dev);
1663 ret = set_supply(rdev, r);
1665 regulator_unlock(rdev);
1666 put_device(&r->dev);
1670 regulator_unlock(rdev);
1673 * In set_machine_constraints() we may have turned this regulator on
1674 * but we couldn't propagate to the supply if it hadn't been resolved
1677 if (rdev->use_count) {
1678 ret = regulator_enable(rdev->supply);
1680 _regulator_put(rdev->supply);
1681 rdev->supply = NULL;
1690 /* Internal regulator request function */
1691 struct regulator *_regulator_get(struct device *dev, const char *id,
1692 enum regulator_get_type get_type)
1694 struct regulator_dev *rdev;
1695 struct regulator *regulator;
1696 const char *devname = dev ? dev_name(dev) : "deviceless";
1699 if (get_type >= MAX_GET_TYPE) {
1700 dev_err(dev, "invalid type %d in %s\n", get_type, __func__);
1701 return ERR_PTR(-EINVAL);
1705 pr_err("get() with no identifier\n");
1706 return ERR_PTR(-EINVAL);
1709 rdev = regulator_dev_lookup(dev, id);
1711 ret = PTR_ERR(rdev);
1714 * If regulator_dev_lookup() fails with error other
1715 * than -ENODEV our job here is done, we simply return it.
1718 return ERR_PTR(ret);
1720 if (!have_full_constraints()) {
1722 "incomplete constraints, dummy supplies not allowed\n");
1723 return ERR_PTR(-ENODEV);
1729 * Assume that a regulator is physically present and
1730 * enabled, even if it isn't hooked up, and just
1734 "%s supply %s not found, using dummy regulator\n",
1736 rdev = dummy_regulator_rdev;
1737 get_device(&rdev->dev);
1742 "dummy supplies not allowed for exclusive requests\n");
1746 return ERR_PTR(-ENODEV);
1750 if (rdev->exclusive) {
1751 regulator = ERR_PTR(-EPERM);
1752 put_device(&rdev->dev);
1756 if (get_type == EXCLUSIVE_GET && rdev->open_count) {
1757 regulator = ERR_PTR(-EBUSY);
1758 put_device(&rdev->dev);
1762 ret = regulator_resolve_supply(rdev);
1764 regulator = ERR_PTR(ret);
1765 put_device(&rdev->dev);
1769 if (!try_module_get(rdev->owner)) {
1770 regulator = ERR_PTR(-EPROBE_DEFER);
1771 put_device(&rdev->dev);
1775 regulator = create_regulator(rdev, dev, id);
1776 if (regulator == NULL) {
1777 regulator = ERR_PTR(-ENOMEM);
1778 module_put(rdev->owner);
1779 put_device(&rdev->dev);
1784 if (get_type == EXCLUSIVE_GET) {
1785 rdev->exclusive = 1;
1787 ret = _regulator_is_enabled(rdev);
1789 rdev->use_count = 1;
1791 rdev->use_count = 0;
1794 device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS);
1800 * regulator_get - lookup and obtain a reference to a regulator.
1801 * @dev: device for regulator "consumer"
1802 * @id: Supply name or regulator ID.
1804 * Returns a struct regulator corresponding to the regulator producer,
1805 * or IS_ERR() condition containing errno.
1807 * Use of supply names configured via regulator_set_device_supply() is
1808 * strongly encouraged. It is recommended that the supply name used
1809 * should match the name used for the supply and/or the relevant
1810 * device pins in the datasheet.
1812 struct regulator *regulator_get(struct device *dev, const char *id)
1814 return _regulator_get(dev, id, NORMAL_GET);
1816 EXPORT_SYMBOL_GPL(regulator_get);
1819 * regulator_get_exclusive - obtain exclusive access to a regulator.
1820 * @dev: device for regulator "consumer"
1821 * @id: Supply name or regulator ID.
1823 * Returns a struct regulator corresponding to the regulator producer,
1824 * or IS_ERR() condition containing errno. Other consumers will be
1825 * unable to obtain this regulator while this reference is held and the
1826 * use count for the regulator will be initialised to reflect the current
1827 * state of the regulator.
1829 * This is intended for use by consumers which cannot tolerate shared
1830 * use of the regulator such as those which need to force the
1831 * regulator off for correct operation of the hardware they are
1834 * Use of supply names configured via regulator_set_device_supply() is
1835 * strongly encouraged. It is recommended that the supply name used
1836 * should match the name used for the supply and/or the relevant
1837 * device pins in the datasheet.
1839 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1841 return _regulator_get(dev, id, EXCLUSIVE_GET);
1843 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1846 * regulator_get_optional - obtain optional access to a regulator.
1847 * @dev: device for regulator "consumer"
1848 * @id: Supply name or regulator ID.
1850 * Returns a struct regulator corresponding to the regulator producer,
1851 * or IS_ERR() condition containing errno.
1853 * This is intended for use by consumers for devices which can have
1854 * some supplies unconnected in normal use, such as some MMC devices.
1855 * It can allow the regulator core to provide stub supplies for other
1856 * supplies requested using normal regulator_get() calls without
1857 * disrupting the operation of drivers that can handle absent
1860 * Use of supply names configured via regulator_set_device_supply() is
1861 * strongly encouraged. It is recommended that the supply name used
1862 * should match the name used for the supply and/or the relevant
1863 * device pins in the datasheet.
1865 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1867 return _regulator_get(dev, id, OPTIONAL_GET);
1869 EXPORT_SYMBOL_GPL(regulator_get_optional);
1871 /* regulator_list_mutex lock held by regulator_put() */
1872 static void _regulator_put(struct regulator *regulator)
1874 struct regulator_dev *rdev;
1876 if (IS_ERR_OR_NULL(regulator))
1879 lockdep_assert_held_once(®ulator_list_mutex);
1881 rdev = regulator->rdev;
1883 debugfs_remove_recursive(regulator->debugfs);
1885 if (regulator->dev) {
1887 struct regulator *r;
1889 list_for_each_entry(r, &rdev->consumer_list, list)
1890 if (r->dev == regulator->dev)
1894 device_link_remove(regulator->dev, &rdev->dev);
1896 /* remove any sysfs entries */
1897 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1900 regulator_lock(rdev);
1901 list_del(®ulator->list);
1904 rdev->exclusive = 0;
1905 regulator_unlock(rdev);
1907 kfree_const(regulator->supply_name);
1910 module_put(rdev->owner);
1911 put_device(&rdev->dev);
1915 * regulator_put - "free" the regulator source
1916 * @regulator: regulator source
1918 * Note: drivers must ensure that all regulator_enable calls made on this
1919 * regulator source are balanced by regulator_disable calls prior to calling
1922 void regulator_put(struct regulator *regulator)
1924 mutex_lock(®ulator_list_mutex);
1925 _regulator_put(regulator);
1926 mutex_unlock(®ulator_list_mutex);
1928 EXPORT_SYMBOL_GPL(regulator_put);
1931 * regulator_register_supply_alias - Provide device alias for supply lookup
1933 * @dev: device that will be given as the regulator "consumer"
1934 * @id: Supply name or regulator ID
1935 * @alias_dev: device that should be used to lookup the supply
1936 * @alias_id: Supply name or regulator ID that should be used to lookup the
1939 * All lookups for id on dev will instead be conducted for alias_id on
1942 int regulator_register_supply_alias(struct device *dev, const char *id,
1943 struct device *alias_dev,
1944 const char *alias_id)
1946 struct regulator_supply_alias *map;
1948 map = regulator_find_supply_alias(dev, id);
1952 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1957 map->src_supply = id;
1958 map->alias_dev = alias_dev;
1959 map->alias_supply = alias_id;
1961 list_add(&map->list, ®ulator_supply_alias_list);
1963 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1964 id, dev_name(dev), alias_id, dev_name(alias_dev));
1968 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1971 * regulator_unregister_supply_alias - Remove device alias
1973 * @dev: device that will be given as the regulator "consumer"
1974 * @id: Supply name or regulator ID
1976 * Remove a lookup alias if one exists for id on dev.
1978 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1980 struct regulator_supply_alias *map;
1982 map = regulator_find_supply_alias(dev, id);
1984 list_del(&map->list);
1988 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1991 * regulator_bulk_register_supply_alias - register multiple aliases
1993 * @dev: device that will be given as the regulator "consumer"
1994 * @id: List of supply names or regulator IDs
1995 * @alias_dev: device that should be used to lookup the supply
1996 * @alias_id: List of supply names or regulator IDs that should be used to
1998 * @num_id: Number of aliases to register
2000 * @return 0 on success, an errno on failure.
2002 * This helper function allows drivers to register several supply
2003 * aliases in one operation. If any of the aliases cannot be
2004 * registered any aliases that were registered will be removed
2005 * before returning to the caller.
2007 int regulator_bulk_register_supply_alias(struct device *dev,
2008 const char *const *id,
2009 struct device *alias_dev,
2010 const char *const *alias_id,
2016 for (i = 0; i < num_id; ++i) {
2017 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
2027 "Failed to create supply alias %s,%s -> %s,%s\n",
2028 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
2031 regulator_unregister_supply_alias(dev, id[i]);
2035 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
2038 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
2040 * @dev: device that will be given as the regulator "consumer"
2041 * @id: List of supply names or regulator IDs
2042 * @num_id: Number of aliases to unregister
2044 * This helper function allows drivers to unregister several supply
2045 * aliases in one operation.
2047 void regulator_bulk_unregister_supply_alias(struct device *dev,
2048 const char *const *id,
2053 for (i = 0; i < num_id; ++i)
2054 regulator_unregister_supply_alias(dev, id[i]);
2056 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
2059 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
2060 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
2061 const struct regulator_config *config)
2063 struct regulator_enable_gpio *pin;
2064 struct gpio_desc *gpiod;
2067 if (config->ena_gpiod)
2068 gpiod = config->ena_gpiod;
2070 gpiod = gpio_to_desc(config->ena_gpio);
2072 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
2073 if (pin->gpiod == gpiod) {
2074 rdev_dbg(rdev, "GPIO %d is already used\n",
2076 goto update_ena_gpio_to_rdev;
2080 if (!config->ena_gpiod) {
2081 ret = gpio_request_one(config->ena_gpio,
2082 GPIOF_DIR_OUT | config->ena_gpio_flags,
2083 rdev_get_name(rdev));
2088 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
2090 if (!config->ena_gpiod)
2091 gpio_free(config->ena_gpio);
2096 pin->ena_gpio_invert = config->ena_gpio_invert;
2097 list_add(&pin->list, ®ulator_ena_gpio_list);
2099 update_ena_gpio_to_rdev:
2100 pin->request_count++;
2101 rdev->ena_pin = pin;
2105 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
2107 struct regulator_enable_gpio *pin, *n;
2112 /* Free the GPIO only in case of no use */
2113 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
2114 if (pin->gpiod == rdev->ena_pin->gpiod) {
2115 if (pin->request_count <= 1) {
2116 pin->request_count = 0;
2117 gpiod_put(pin->gpiod);
2118 list_del(&pin->list);
2120 rdev->ena_pin = NULL;
2123 pin->request_count--;
2130 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
2131 * @rdev: regulator_dev structure
2132 * @enable: enable GPIO at initial use?
2134 * GPIO is enabled in case of initial use. (enable_count is 0)
2135 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2137 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
2139 struct regulator_enable_gpio *pin = rdev->ena_pin;
2145 /* Enable GPIO at initial use */
2146 if (pin->enable_count == 0)
2147 gpiod_set_value_cansleep(pin->gpiod,
2148 !pin->ena_gpio_invert);
2150 pin->enable_count++;
2152 if (pin->enable_count > 1) {
2153 pin->enable_count--;
2157 /* Disable GPIO if not used */
2158 if (pin->enable_count <= 1) {
2159 gpiod_set_value_cansleep(pin->gpiod,
2160 pin->ena_gpio_invert);
2161 pin->enable_count = 0;
2169 * _regulator_enable_delay - a delay helper function
2170 * @delay: time to delay in microseconds
2172 * Delay for the requested amount of time as per the guidelines in:
2174 * Documentation/timers/timers-howto.txt
2176 * The assumption here is that regulators will never be enabled in
2177 * atomic context and therefore sleeping functions can be used.
2179 static void _regulator_enable_delay(unsigned int delay)
2181 unsigned int ms = delay / 1000;
2182 unsigned int us = delay % 1000;
2186 * For small enough values, handle super-millisecond
2187 * delays in the usleep_range() call below.
2196 * Give the scheduler some room to coalesce with any other
2197 * wakeup sources. For delays shorter than 10 us, don't even
2198 * bother setting up high-resolution timers and just busy-
2202 usleep_range(us, us + 100);
2207 static int _regulator_do_enable(struct regulator_dev *rdev)
2211 /* Query before enabling in case configuration dependent. */
2212 ret = _regulator_get_enable_time(rdev);
2216 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2220 trace_regulator_enable(rdev_get_name(rdev));
2222 if (rdev->desc->off_on_delay) {
2223 /* if needed, keep a distance of off_on_delay from last time
2224 * this regulator was disabled.
2226 unsigned long start_jiffy = jiffies;
2227 unsigned long intended, max_delay, remaining;
2229 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2230 intended = rdev->last_off_jiffy + max_delay;
2232 if (time_before(start_jiffy, intended)) {
2233 /* calc remaining jiffies to deal with one-time
2235 * in case of multiple timer wrapping, either it can be
2236 * detected by out-of-range remaining, or it cannot be
2237 * detected and we gets a panelty of
2238 * _regulator_enable_delay().
2240 remaining = intended - start_jiffy;
2241 if (remaining <= max_delay)
2242 _regulator_enable_delay(
2243 jiffies_to_usecs(remaining));
2247 if (rdev->ena_pin) {
2248 if (!rdev->ena_gpio_state) {
2249 ret = regulator_ena_gpio_ctrl(rdev, true);
2252 rdev->ena_gpio_state = 1;
2254 } else if (rdev->desc->ops->enable) {
2255 ret = rdev->desc->ops->enable(rdev);
2262 /* Allow the regulator to ramp; it would be useful to extend
2263 * this for bulk operations so that the regulators can ramp
2265 trace_regulator_enable_delay(rdev_get_name(rdev));
2267 _regulator_enable_delay(delay);
2269 trace_regulator_enable_complete(rdev_get_name(rdev));
2274 /* locks held by regulator_enable() */
2275 static int _regulator_enable(struct regulator_dev *rdev)
2279 lockdep_assert_held_once(&rdev->mutex);
2281 /* check voltage and requested load before enabling */
2282 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2283 drms_uA_update(rdev);
2285 if (rdev->use_count == 0) {
2286 /* The regulator may on if it's not switchable or left on */
2287 ret = _regulator_is_enabled(rdev);
2288 if (ret == -EINVAL || ret == 0) {
2289 if (!regulator_ops_is_valid(rdev,
2290 REGULATOR_CHANGE_STATUS))
2293 ret = _regulator_do_enable(rdev);
2297 _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE,
2299 } else if (ret < 0) {
2300 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
2303 /* Fallthrough on positive return values - already enabled */
2312 * regulator_enable - enable regulator output
2313 * @regulator: regulator source
2315 * Request that the regulator be enabled with the regulator output at
2316 * the predefined voltage or current value. Calls to regulator_enable()
2317 * must be balanced with calls to regulator_disable().
2319 * NOTE: the output value can be set by other drivers, boot loader or may be
2320 * hardwired in the regulator.
2322 int regulator_enable(struct regulator *regulator)
2324 struct regulator_dev *rdev = regulator->rdev;
2327 if (regulator->always_on)
2331 ret = regulator_enable(rdev->supply);
2336 mutex_lock(&rdev->mutex);
2337 ret = _regulator_enable(rdev);
2338 mutex_unlock(&rdev->mutex);
2340 if (ret != 0 && rdev->supply)
2341 regulator_disable(rdev->supply);
2345 EXPORT_SYMBOL_GPL(regulator_enable);
2347 static int _regulator_do_disable(struct regulator_dev *rdev)
2351 trace_regulator_disable(rdev_get_name(rdev));
2353 if (rdev->ena_pin) {
2354 if (rdev->ena_gpio_state) {
2355 ret = regulator_ena_gpio_ctrl(rdev, false);
2358 rdev->ena_gpio_state = 0;
2361 } else if (rdev->desc->ops->disable) {
2362 ret = rdev->desc->ops->disable(rdev);
2367 /* cares about last_off_jiffy only if off_on_delay is required by
2370 if (rdev->desc->off_on_delay)
2371 rdev->last_off_jiffy = jiffies;
2373 trace_regulator_disable_complete(rdev_get_name(rdev));
2378 /* locks held by regulator_disable() */
2379 static int _regulator_disable(struct regulator_dev *rdev)
2383 lockdep_assert_held_once(&rdev->mutex);
2385 if (WARN(rdev->use_count <= 0,
2386 "unbalanced disables for %s\n", rdev_get_name(rdev)))
2389 /* are we the last user and permitted to disable ? */
2390 if (rdev->use_count == 1 &&
2391 (rdev->constraints && !rdev->constraints->always_on)) {
2393 /* we are last user */
2394 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
2395 ret = _notifier_call_chain(rdev,
2396 REGULATOR_EVENT_PRE_DISABLE,
2398 if (ret & NOTIFY_STOP_MASK)
2401 ret = _regulator_do_disable(rdev);
2403 rdev_err(rdev, "failed to disable\n");
2404 _notifier_call_chain(rdev,
2405 REGULATOR_EVENT_ABORT_DISABLE,
2409 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2413 rdev->use_count = 0;
2414 } else if (rdev->use_count > 1) {
2415 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2416 drms_uA_update(rdev);
2425 * regulator_disable - disable regulator output
2426 * @regulator: regulator source
2428 * Disable the regulator output voltage or current. Calls to
2429 * regulator_enable() must be balanced with calls to
2430 * regulator_disable().
2432 * NOTE: this will only disable the regulator output if no other consumer
2433 * devices have it enabled, the regulator device supports disabling and
2434 * machine constraints permit this operation.
2436 int regulator_disable(struct regulator *regulator)
2438 struct regulator_dev *rdev = regulator->rdev;
2441 if (regulator->always_on)
2444 mutex_lock(&rdev->mutex);
2445 ret = _regulator_disable(rdev);
2446 mutex_unlock(&rdev->mutex);
2448 if (ret == 0 && rdev->supply)
2449 regulator_disable(rdev->supply);
2453 EXPORT_SYMBOL_GPL(regulator_disable);
2455 /* locks held by regulator_force_disable() */
2456 static int _regulator_force_disable(struct regulator_dev *rdev)
2460 lockdep_assert_held_once(&rdev->mutex);
2462 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2463 REGULATOR_EVENT_PRE_DISABLE, NULL);
2464 if (ret & NOTIFY_STOP_MASK)
2467 ret = _regulator_do_disable(rdev);
2469 rdev_err(rdev, "failed to force disable\n");
2470 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2471 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2475 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2476 REGULATOR_EVENT_DISABLE, NULL);
2482 * regulator_force_disable - force disable regulator output
2483 * @regulator: regulator source
2485 * Forcibly disable the regulator output voltage or current.
2486 * NOTE: this *will* disable the regulator output even if other consumer
2487 * devices have it enabled. This should be used for situations when device
2488 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2490 int regulator_force_disable(struct regulator *regulator)
2492 struct regulator_dev *rdev = regulator->rdev;
2495 mutex_lock(&rdev->mutex);
2496 regulator->uA_load = 0;
2497 ret = _regulator_force_disable(regulator->rdev);
2498 mutex_unlock(&rdev->mutex);
2501 while (rdev->open_count--)
2502 regulator_disable(rdev->supply);
2506 EXPORT_SYMBOL_GPL(regulator_force_disable);
2508 static void regulator_disable_work(struct work_struct *work)
2510 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2514 regulator_lock(rdev);
2516 BUG_ON(!rdev->deferred_disables);
2518 count = rdev->deferred_disables;
2519 rdev->deferred_disables = 0;
2522 * Workqueue functions queue the new work instance while the previous
2523 * work instance is being processed. Cancel the queued work instance
2524 * as the work instance under processing does the job of the queued
2527 cancel_delayed_work(&rdev->disable_work);
2529 for (i = 0; i < count; i++) {
2530 ret = _regulator_disable(rdev);
2532 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2535 regulator_unlock(rdev);
2538 for (i = 0; i < count; i++) {
2539 ret = regulator_disable(rdev->supply);
2542 "Supply disable failed: %d\n", ret);
2549 * regulator_disable_deferred - disable regulator output with delay
2550 * @regulator: regulator source
2551 * @ms: miliseconds until the regulator is disabled
2553 * Execute regulator_disable() on the regulator after a delay. This
2554 * is intended for use with devices that require some time to quiesce.
2556 * NOTE: this will only disable the regulator output if no other consumer
2557 * devices have it enabled, the regulator device supports disabling and
2558 * machine constraints permit this operation.
2560 int regulator_disable_deferred(struct regulator *regulator, int ms)
2562 struct regulator_dev *rdev = regulator->rdev;
2564 if (regulator->always_on)
2568 return regulator_disable(regulator);
2570 regulator_lock(rdev);
2571 rdev->deferred_disables++;
2572 mod_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2573 msecs_to_jiffies(ms));
2574 regulator_unlock(rdev);
2578 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2580 static int _regulator_is_enabled(struct regulator_dev *rdev)
2582 /* A GPIO control always takes precedence */
2584 return rdev->ena_gpio_state;
2586 /* If we don't know then assume that the regulator is always on */
2587 if (!rdev->desc->ops->is_enabled)
2590 return rdev->desc->ops->is_enabled(rdev);
2593 static int _regulator_list_voltage(struct regulator_dev *rdev,
2594 unsigned selector, int lock)
2596 const struct regulator_ops *ops = rdev->desc->ops;
2599 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2600 return rdev->desc->fixed_uV;
2602 if (ops->list_voltage) {
2603 if (selector >= rdev->desc->n_voltages)
2606 regulator_lock(rdev);
2607 ret = ops->list_voltage(rdev, selector);
2609 regulator_unlock(rdev);
2610 } else if (rdev->is_switch && rdev->supply) {
2611 ret = _regulator_list_voltage(rdev->supply->rdev,
2618 if (ret < rdev->constraints->min_uV)
2620 else if (ret > rdev->constraints->max_uV)
2628 * regulator_is_enabled - is the regulator output enabled
2629 * @regulator: regulator source
2631 * Returns positive if the regulator driver backing the source/client
2632 * has requested that the device be enabled, zero if it hasn't, else a
2633 * negative errno code.
2635 * Note that the device backing this regulator handle can have multiple
2636 * users, so it might be enabled even if regulator_enable() was never
2637 * called for this particular source.
2639 int regulator_is_enabled(struct regulator *regulator)
2643 if (regulator->always_on)
2646 mutex_lock(®ulator->rdev->mutex);
2647 ret = _regulator_is_enabled(regulator->rdev);
2648 mutex_unlock(®ulator->rdev->mutex);
2652 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2655 * regulator_count_voltages - count regulator_list_voltage() selectors
2656 * @regulator: regulator source
2658 * Returns number of selectors, or negative errno. Selectors are
2659 * numbered starting at zero, and typically correspond to bitfields
2660 * in hardware registers.
2662 int regulator_count_voltages(struct regulator *regulator)
2664 struct regulator_dev *rdev = regulator->rdev;
2666 if (rdev->desc->n_voltages)
2667 return rdev->desc->n_voltages;
2669 if (!rdev->is_switch || !rdev->supply)
2672 return regulator_count_voltages(rdev->supply);
2674 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2677 * regulator_list_voltage - enumerate supported voltages
2678 * @regulator: regulator source
2679 * @selector: identify voltage to list
2680 * Context: can sleep
2682 * Returns a voltage that can be passed to @regulator_set_voltage(),
2683 * zero if this selector code can't be used on this system, or a
2686 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2688 return _regulator_list_voltage(regulator->rdev, selector, 1);
2690 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2693 * regulator_get_regmap - get the regulator's register map
2694 * @regulator: regulator source
2696 * Returns the register map for the given regulator, or an ERR_PTR value
2697 * if the regulator doesn't use regmap.
2699 struct regmap *regulator_get_regmap(struct regulator *regulator)
2701 struct regmap *map = regulator->rdev->regmap;
2703 return map ? map : ERR_PTR(-EOPNOTSUPP);
2707 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2708 * @regulator: regulator source
2709 * @vsel_reg: voltage selector register, output parameter
2710 * @vsel_mask: mask for voltage selector bitfield, output parameter
2712 * Returns the hardware register offset and bitmask used for setting the
2713 * regulator voltage. This might be useful when configuring voltage-scaling
2714 * hardware or firmware that can make I2C requests behind the kernel's back,
2717 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2718 * and 0 is returned, otherwise a negative errno is returned.
2720 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2722 unsigned *vsel_mask)
2724 struct regulator_dev *rdev = regulator->rdev;
2725 const struct regulator_ops *ops = rdev->desc->ops;
2727 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2730 *vsel_reg = rdev->desc->vsel_reg;
2731 *vsel_mask = rdev->desc->vsel_mask;
2735 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2738 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2739 * @regulator: regulator source
2740 * @selector: identify voltage to list
2742 * Converts the selector to a hardware-specific voltage selector that can be
2743 * directly written to the regulator registers. The address of the voltage
2744 * register can be determined by calling @regulator_get_hardware_vsel_register.
2746 * On error a negative errno is returned.
2748 int regulator_list_hardware_vsel(struct regulator *regulator,
2751 struct regulator_dev *rdev = regulator->rdev;
2752 const struct regulator_ops *ops = rdev->desc->ops;
2754 if (selector >= rdev->desc->n_voltages)
2756 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2761 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2764 * regulator_get_linear_step - return the voltage step size between VSEL values
2765 * @regulator: regulator source
2767 * Returns the voltage step size between VSEL values for linear
2768 * regulators, or return 0 if the regulator isn't a linear regulator.
2770 unsigned int regulator_get_linear_step(struct regulator *regulator)
2772 struct regulator_dev *rdev = regulator->rdev;
2774 return rdev->desc->uV_step;
2776 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2779 * regulator_is_supported_voltage - check if a voltage range can be supported
2781 * @regulator: Regulator to check.
2782 * @min_uV: Minimum required voltage in uV.
2783 * @max_uV: Maximum required voltage in uV.
2785 * Returns a boolean or a negative error code.
2787 int regulator_is_supported_voltage(struct regulator *regulator,
2788 int min_uV, int max_uV)
2790 struct regulator_dev *rdev = regulator->rdev;
2791 int i, voltages, ret;
2793 /* If we can't change voltage check the current voltage */
2794 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2795 ret = regulator_get_voltage(regulator);
2797 return min_uV <= ret && ret <= max_uV;
2802 /* Any voltage within constrains range is fine? */
2803 if (rdev->desc->continuous_voltage_range)
2804 return min_uV >= rdev->constraints->min_uV &&
2805 max_uV <= rdev->constraints->max_uV;
2807 ret = regulator_count_voltages(regulator);
2812 for (i = 0; i < voltages; i++) {
2813 ret = regulator_list_voltage(regulator, i);
2815 if (ret >= min_uV && ret <= max_uV)
2821 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2823 static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2826 const struct regulator_desc *desc = rdev->desc;
2828 if (desc->ops->map_voltage)
2829 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2831 if (desc->ops->list_voltage == regulator_list_voltage_linear)
2832 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2834 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2835 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2837 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2840 static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2841 int min_uV, int max_uV,
2844 struct pre_voltage_change_data data;
2847 data.old_uV = _regulator_get_voltage(rdev);
2848 data.min_uV = min_uV;
2849 data.max_uV = max_uV;
2850 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2852 if (ret & NOTIFY_STOP_MASK)
2855 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2859 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2860 (void *)data.old_uV);
2865 static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2866 int uV, unsigned selector)
2868 struct pre_voltage_change_data data;
2871 data.old_uV = _regulator_get_voltage(rdev);
2874 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2876 if (ret & NOTIFY_STOP_MASK)
2879 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2883 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2884 (void *)data.old_uV);
2889 static int _regulator_set_voltage_time(struct regulator_dev *rdev,
2890 int old_uV, int new_uV)
2892 unsigned int ramp_delay = 0;
2894 if (rdev->constraints->ramp_delay)
2895 ramp_delay = rdev->constraints->ramp_delay;
2896 else if (rdev->desc->ramp_delay)
2897 ramp_delay = rdev->desc->ramp_delay;
2898 else if (rdev->constraints->settling_time)
2899 return rdev->constraints->settling_time;
2900 else if (rdev->constraints->settling_time_up &&
2902 return rdev->constraints->settling_time_up;
2903 else if (rdev->constraints->settling_time_down &&
2905 return rdev->constraints->settling_time_down;
2907 if (ramp_delay == 0) {
2908 rdev_dbg(rdev, "ramp_delay not set\n");
2912 return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
2915 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2916 int min_uV, int max_uV)
2921 unsigned int selector;
2922 int old_selector = -1;
2923 const struct regulator_ops *ops = rdev->desc->ops;
2924 int old_uV = _regulator_get_voltage(rdev);
2926 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2928 min_uV += rdev->constraints->uV_offset;
2929 max_uV += rdev->constraints->uV_offset;
2932 * If we can't obtain the old selector there is not enough
2933 * info to call set_voltage_time_sel().
2935 if (_regulator_is_enabled(rdev) &&
2936 ops->set_voltage_time_sel && ops->get_voltage_sel) {
2937 old_selector = ops->get_voltage_sel(rdev);
2938 if (old_selector < 0)
2939 return old_selector;
2942 if (ops->set_voltage) {
2943 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2947 if (ops->list_voltage)
2948 best_val = ops->list_voltage(rdev,
2951 best_val = _regulator_get_voltage(rdev);
2954 } else if (ops->set_voltage_sel) {
2955 ret = regulator_map_voltage(rdev, min_uV, max_uV);
2957 best_val = ops->list_voltage(rdev, ret);
2958 if (min_uV <= best_val && max_uV >= best_val) {
2960 if (old_selector == selector)
2963 ret = _regulator_call_set_voltage_sel(
2964 rdev, best_val, selector);
2976 if (ops->set_voltage_time_sel) {
2978 * Call set_voltage_time_sel if successfully obtained
2981 if (old_selector >= 0 && old_selector != selector)
2982 delay = ops->set_voltage_time_sel(rdev, old_selector,
2985 if (old_uV != best_val) {
2986 if (ops->set_voltage_time)
2987 delay = ops->set_voltage_time(rdev, old_uV,
2990 delay = _regulator_set_voltage_time(rdev,
2997 rdev_warn(rdev, "failed to get delay: %d\n", delay);
3001 /* Insert any necessary delays */
3002 if (delay >= 1000) {
3003 mdelay(delay / 1000);
3004 udelay(delay % 1000);
3009 if (best_val >= 0) {
3010 unsigned long data = best_val;
3012 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
3017 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
3022 static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev,
3023 int min_uV, int max_uV, suspend_state_t state)
3025 struct regulator_state *rstate;
3028 rstate = regulator_get_suspend_state(rdev, state);
3032 if (min_uV < rstate->min_uV)
3033 min_uV = rstate->min_uV;
3034 if (max_uV > rstate->max_uV)
3035 max_uV = rstate->max_uV;
3037 sel = regulator_map_voltage(rdev, min_uV, max_uV);
3041 uV = rdev->desc->ops->list_voltage(rdev, sel);
3042 if (uV >= min_uV && uV <= max_uV)
3048 static int regulator_set_voltage_unlocked(struct regulator *regulator,
3049 int min_uV, int max_uV,
3050 suspend_state_t state)
3052 struct regulator_dev *rdev = regulator->rdev;
3053 struct regulator_voltage *voltage = ®ulator->voltage[state];
3055 int old_min_uV, old_max_uV;
3057 int best_supply_uV = 0;
3058 int supply_change_uV = 0;
3060 /* If we're setting the same range as last time the change
3061 * should be a noop (some cpufreq implementations use the same
3062 * voltage for multiple frequencies, for example).
3064 if (voltage->min_uV == min_uV && voltage->max_uV == max_uV)
3067 /* If we're trying to set a range that overlaps the current voltage,
3068 * return successfully even though the regulator does not support
3069 * changing the voltage.
3071 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
3072 current_uV = _regulator_get_voltage(rdev);
3073 if (min_uV <= current_uV && current_uV <= max_uV) {
3074 voltage->min_uV = min_uV;
3075 voltage->max_uV = max_uV;
3081 if (!rdev->desc->ops->set_voltage &&
3082 !rdev->desc->ops->set_voltage_sel) {
3087 /* constraints check */
3088 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3092 /* restore original values in case of error */
3093 old_min_uV = voltage->min_uV;
3094 old_max_uV = voltage->max_uV;
3095 voltage->min_uV = min_uV;
3096 voltage->max_uV = max_uV;
3098 ret = regulator_check_consumers(rdev, &min_uV, &max_uV, state);
3103 regulator_ops_is_valid(rdev->supply->rdev,
3104 REGULATOR_CHANGE_VOLTAGE) &&
3105 (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage ||
3106 rdev->desc->ops->get_voltage_sel))) {
3107 int current_supply_uV;
3110 selector = regulator_map_voltage(rdev, min_uV, max_uV);
3116 best_supply_uV = _regulator_list_voltage(rdev, selector, 0);
3117 if (best_supply_uV < 0) {
3118 ret = best_supply_uV;
3122 best_supply_uV += rdev->desc->min_dropout_uV;
3124 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
3125 if (current_supply_uV < 0) {
3126 ret = current_supply_uV;
3130 supply_change_uV = best_supply_uV - current_supply_uV;
3133 if (supply_change_uV > 0) {
3134 ret = regulator_set_voltage_unlocked(rdev->supply,
3135 best_supply_uV, INT_MAX, state);
3137 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
3143 if (state == PM_SUSPEND_ON)
3144 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3146 ret = _regulator_do_set_suspend_voltage(rdev, min_uV,
3151 if (supply_change_uV < 0) {
3152 ret = regulator_set_voltage_unlocked(rdev->supply,
3153 best_supply_uV, INT_MAX, state);
3155 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
3157 /* No need to fail here */
3164 voltage->min_uV = old_min_uV;
3165 voltage->max_uV = old_max_uV;
3171 * regulator_set_voltage - set regulator output voltage
3172 * @regulator: regulator source
3173 * @min_uV: Minimum required voltage in uV
3174 * @max_uV: Maximum acceptable voltage in uV
3176 * Sets a voltage regulator to the desired output voltage. This can be set
3177 * during any regulator state. IOW, regulator can be disabled or enabled.
3179 * If the regulator is enabled then the voltage will change to the new value
3180 * immediately otherwise if the regulator is disabled the regulator will
3181 * output at the new voltage when enabled.
3183 * NOTE: If the regulator is shared between several devices then the lowest
3184 * request voltage that meets the system constraints will be used.
3185 * Regulator system constraints must be set for this regulator before
3186 * calling this function otherwise this call will fail.
3188 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
3192 regulator_lock_supply(regulator->rdev);
3194 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV,
3197 regulator_unlock_supply(regulator->rdev);
3201 EXPORT_SYMBOL_GPL(regulator_set_voltage);
3203 static inline int regulator_suspend_toggle(struct regulator_dev *rdev,
3204 suspend_state_t state, bool en)
3206 struct regulator_state *rstate;
3208 rstate = regulator_get_suspend_state(rdev, state);
3212 if (!rstate->changeable)
3215 rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND;
3220 int regulator_suspend_enable(struct regulator_dev *rdev,
3221 suspend_state_t state)
3223 return regulator_suspend_toggle(rdev, state, true);
3225 EXPORT_SYMBOL_GPL(regulator_suspend_enable);
3227 int regulator_suspend_disable(struct regulator_dev *rdev,
3228 suspend_state_t state)
3230 struct regulator *regulator;
3231 struct regulator_voltage *voltage;
3234 * if any consumer wants this regulator device keeping on in
3235 * suspend states, don't set it as disabled.
3237 list_for_each_entry(regulator, &rdev->consumer_list, list) {
3238 voltage = ®ulator->voltage[state];
3239 if (voltage->min_uV || voltage->max_uV)
3243 return regulator_suspend_toggle(rdev, state, false);
3245 EXPORT_SYMBOL_GPL(regulator_suspend_disable);
3247 static int _regulator_set_suspend_voltage(struct regulator *regulator,
3248 int min_uV, int max_uV,
3249 suspend_state_t state)
3251 struct regulator_dev *rdev = regulator->rdev;
3252 struct regulator_state *rstate;
3254 rstate = regulator_get_suspend_state(rdev, state);
3258 if (rstate->min_uV == rstate->max_uV) {
3259 rdev_err(rdev, "The suspend voltage can't be changed!\n");
3263 return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state);
3266 int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV,
3267 int max_uV, suspend_state_t state)
3271 /* PM_SUSPEND_ON is handled by regulator_set_voltage() */
3272 if (regulator_check_states(state) || state == PM_SUSPEND_ON)
3275 regulator_lock_supply(regulator->rdev);
3277 ret = _regulator_set_suspend_voltage(regulator, min_uV,
3280 regulator_unlock_supply(regulator->rdev);
3284 EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage);
3287 * regulator_set_voltage_time - get raise/fall time
3288 * @regulator: regulator source
3289 * @old_uV: starting voltage in microvolts
3290 * @new_uV: target voltage in microvolts
3292 * Provided with the starting and ending voltage, this function attempts to
3293 * calculate the time in microseconds required to rise or fall to this new
3296 int regulator_set_voltage_time(struct regulator *regulator,
3297 int old_uV, int new_uV)
3299 struct regulator_dev *rdev = regulator->rdev;
3300 const struct regulator_ops *ops = rdev->desc->ops;
3306 if (ops->set_voltage_time)
3307 return ops->set_voltage_time(rdev, old_uV, new_uV);
3308 else if (!ops->set_voltage_time_sel)
3309 return _regulator_set_voltage_time(rdev, old_uV, new_uV);
3311 /* Currently requires operations to do this */
3312 if (!ops->list_voltage || !rdev->desc->n_voltages)
3315 for (i = 0; i < rdev->desc->n_voltages; i++) {
3316 /* We only look for exact voltage matches here */
3317 voltage = regulator_list_voltage(regulator, i);
3322 if (voltage == old_uV)
3324 if (voltage == new_uV)
3328 if (old_sel < 0 || new_sel < 0)
3331 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3333 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3336 * regulator_set_voltage_time_sel - get raise/fall time
3337 * @rdev: regulator source device
3338 * @old_selector: selector for starting voltage
3339 * @new_selector: selector for target voltage
3341 * Provided with the starting and target voltage selectors, this function
3342 * returns time in microseconds required to rise or fall to this new voltage
3344 * Drivers providing ramp_delay in regulation_constraints can use this as their
3345 * set_voltage_time_sel() operation.
3347 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3348 unsigned int old_selector,
3349 unsigned int new_selector)
3351 int old_volt, new_volt;
3354 if (!rdev->desc->ops->list_voltage)
3357 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3358 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3360 if (rdev->desc->ops->set_voltage_time)
3361 return rdev->desc->ops->set_voltage_time(rdev, old_volt,
3364 return _regulator_set_voltage_time(rdev, old_volt, new_volt);
3366 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
3369 * regulator_sync_voltage - re-apply last regulator output voltage
3370 * @regulator: regulator source
3372 * Re-apply the last configured voltage. This is intended to be used
3373 * where some external control source the consumer is cooperating with
3374 * has caused the configured voltage to change.
3376 int regulator_sync_voltage(struct regulator *regulator)
3378 struct regulator_dev *rdev = regulator->rdev;
3379 struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON];
3380 int ret, min_uV, max_uV;
3382 regulator_lock(rdev);
3384 if (!rdev->desc->ops->set_voltage &&
3385 !rdev->desc->ops->set_voltage_sel) {
3390 /* This is only going to work if we've had a voltage configured. */
3391 if (!voltage->min_uV && !voltage->max_uV) {
3396 min_uV = voltage->min_uV;
3397 max_uV = voltage->max_uV;
3399 /* This should be a paranoia check... */
3400 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3404 ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0);
3408 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3411 regulator_unlock(rdev);
3414 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3416 static int _regulator_get_voltage(struct regulator_dev *rdev)
3421 if (rdev->desc->ops->get_bypass) {
3422 ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
3426 /* if bypassed the regulator must have a supply */
3427 if (!rdev->supply) {
3429 "bypassed regulator has no supply!\n");
3430 return -EPROBE_DEFER;
3433 return _regulator_get_voltage(rdev->supply->rdev);
3437 if (rdev->desc->ops->get_voltage_sel) {
3438 sel = rdev->desc->ops->get_voltage_sel(rdev);
3441 ret = rdev->desc->ops->list_voltage(rdev, sel);
3442 } else if (rdev->desc->ops->get_voltage) {
3443 ret = rdev->desc->ops->get_voltage(rdev);
3444 } else if (rdev->desc->ops->list_voltage) {
3445 ret = rdev->desc->ops->list_voltage(rdev, 0);
3446 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3447 ret = rdev->desc->fixed_uV;
3448 } else if (rdev->supply) {
3449 ret = _regulator_get_voltage(rdev->supply->rdev);
3450 } else if (rdev->supply_name) {
3451 return -EPROBE_DEFER;
3458 return ret - rdev->constraints->uV_offset;
3462 * regulator_get_voltage - get regulator output voltage
3463 * @regulator: regulator source
3465 * This returns the current regulator voltage in uV.
3467 * NOTE: If the regulator is disabled it will return the voltage value. This
3468 * function should not be used to determine regulator state.
3470 int regulator_get_voltage(struct regulator *regulator)
3474 regulator_lock_supply(regulator->rdev);
3476 ret = _regulator_get_voltage(regulator->rdev);
3478 regulator_unlock_supply(regulator->rdev);
3482 EXPORT_SYMBOL_GPL(regulator_get_voltage);
3485 * regulator_set_current_limit - set regulator output current limit
3486 * @regulator: regulator source
3487 * @min_uA: Minimum supported current in uA
3488 * @max_uA: Maximum supported current in uA
3490 * Sets current sink to the desired output current. This can be set during
3491 * any regulator state. IOW, regulator can be disabled or enabled.
3493 * If the regulator is enabled then the current will change to the new value
3494 * immediately otherwise if the regulator is disabled the regulator will
3495 * output at the new current when enabled.
3497 * NOTE: Regulator system constraints must be set for this regulator before
3498 * calling this function otherwise this call will fail.
3500 int regulator_set_current_limit(struct regulator *regulator,
3501 int min_uA, int max_uA)
3503 struct regulator_dev *rdev = regulator->rdev;
3506 regulator_lock(rdev);
3509 if (!rdev->desc->ops->set_current_limit) {
3514 /* constraints check */
3515 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3519 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3521 regulator_unlock(rdev);
3524 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3526 static int _regulator_get_current_limit(struct regulator_dev *rdev)
3530 regulator_lock(rdev);
3533 if (!rdev->desc->ops->get_current_limit) {
3538 ret = rdev->desc->ops->get_current_limit(rdev);
3540 regulator_unlock(rdev);
3545 * regulator_get_current_limit - get regulator output current
3546 * @regulator: regulator source
3548 * This returns the current supplied by the specified current sink in uA.
3550 * NOTE: If the regulator is disabled it will return the current value. This
3551 * function should not be used to determine regulator state.
3553 int regulator_get_current_limit(struct regulator *regulator)
3555 return _regulator_get_current_limit(regulator->rdev);
3557 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3560 * regulator_set_mode - set regulator operating mode
3561 * @regulator: regulator source
3562 * @mode: operating mode - one of the REGULATOR_MODE constants
3564 * Set regulator operating mode to increase regulator efficiency or improve
3565 * regulation performance.
3567 * NOTE: Regulator system constraints must be set for this regulator before
3568 * calling this function otherwise this call will fail.
3570 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3572 struct regulator_dev *rdev = regulator->rdev;
3574 int regulator_curr_mode;
3576 regulator_lock(rdev);
3579 if (!rdev->desc->ops->set_mode) {
3584 /* return if the same mode is requested */
3585 if (rdev->desc->ops->get_mode) {
3586 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3587 if (regulator_curr_mode == mode) {
3593 /* constraints check */
3594 ret = regulator_mode_constrain(rdev, &mode);
3598 ret = rdev->desc->ops->set_mode(rdev, mode);
3600 regulator_unlock(rdev);
3603 EXPORT_SYMBOL_GPL(regulator_set_mode);
3605 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3609 regulator_lock(rdev);
3612 if (!rdev->desc->ops->get_mode) {
3617 ret = rdev->desc->ops->get_mode(rdev);
3619 regulator_unlock(rdev);
3624 * regulator_get_mode - get regulator operating mode
3625 * @regulator: regulator source
3627 * Get the current regulator operating mode.
3629 unsigned int regulator_get_mode(struct regulator *regulator)
3631 return _regulator_get_mode(regulator->rdev);
3633 EXPORT_SYMBOL_GPL(regulator_get_mode);
3635 static int _regulator_get_error_flags(struct regulator_dev *rdev,
3636 unsigned int *flags)
3640 regulator_lock(rdev);
3643 if (!rdev->desc->ops->get_error_flags) {
3648 ret = rdev->desc->ops->get_error_flags(rdev, flags);
3650 regulator_unlock(rdev);
3655 * regulator_get_error_flags - get regulator error information
3656 * @regulator: regulator source
3657 * @flags: pointer to store error flags
3659 * Get the current regulator error information.
3661 int regulator_get_error_flags(struct regulator *regulator,
3662 unsigned int *flags)
3664 return _regulator_get_error_flags(regulator->rdev, flags);
3666 EXPORT_SYMBOL_GPL(regulator_get_error_flags);
3669 * regulator_set_load - set regulator load
3670 * @regulator: regulator source
3671 * @uA_load: load current
3673 * Notifies the regulator core of a new device load. This is then used by
3674 * DRMS (if enabled by constraints) to set the most efficient regulator
3675 * operating mode for the new regulator loading.
3677 * Consumer devices notify their supply regulator of the maximum power
3678 * they will require (can be taken from device datasheet in the power
3679 * consumption tables) when they change operational status and hence power
3680 * state. Examples of operational state changes that can affect power
3681 * consumption are :-
3683 * o Device is opened / closed.
3684 * o Device I/O is about to begin or has just finished.
3685 * o Device is idling in between work.
3687 * This information is also exported via sysfs to userspace.
3689 * DRMS will sum the total requested load on the regulator and change
3690 * to the most efficient operating mode if platform constraints allow.
3692 * On error a negative errno is returned.
3694 int regulator_set_load(struct regulator *regulator, int uA_load)
3696 struct regulator_dev *rdev = regulator->rdev;
3699 regulator_lock(rdev);
3700 regulator->uA_load = uA_load;
3701 ret = drms_uA_update(rdev);
3702 regulator_unlock(rdev);
3706 EXPORT_SYMBOL_GPL(regulator_set_load);
3709 * regulator_allow_bypass - allow the regulator to go into bypass mode
3711 * @regulator: Regulator to configure
3712 * @enable: enable or disable bypass mode
3714 * Allow the regulator to go into bypass mode if all other consumers
3715 * for the regulator also enable bypass mode and the machine
3716 * constraints allow this. Bypass mode means that the regulator is
3717 * simply passing the input directly to the output with no regulation.
3719 int regulator_allow_bypass(struct regulator *regulator, bool enable)
3721 struct regulator_dev *rdev = regulator->rdev;
3724 if (!rdev->desc->ops->set_bypass)
3727 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS))
3730 regulator_lock(rdev);
3732 if (enable && !regulator->bypass) {
3733 rdev->bypass_count++;
3735 if (rdev->bypass_count == rdev->open_count) {
3736 ret = rdev->desc->ops->set_bypass(rdev, enable);
3738 rdev->bypass_count--;
3741 } else if (!enable && regulator->bypass) {
3742 rdev->bypass_count--;
3744 if (rdev->bypass_count != rdev->open_count) {
3745 ret = rdev->desc->ops->set_bypass(rdev, enable);
3747 rdev->bypass_count++;
3752 regulator->bypass = enable;
3754 regulator_unlock(rdev);
3758 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3761 * regulator_register_notifier - register regulator event notifier
3762 * @regulator: regulator source
3763 * @nb: notifier block
3765 * Register notifier block to receive regulator events.
3767 int regulator_register_notifier(struct regulator *regulator,
3768 struct notifier_block *nb)
3770 return blocking_notifier_chain_register(®ulator->rdev->notifier,
3773 EXPORT_SYMBOL_GPL(regulator_register_notifier);
3776 * regulator_unregister_notifier - unregister regulator event notifier
3777 * @regulator: regulator source
3778 * @nb: notifier block
3780 * Unregister regulator event notifier block.
3782 int regulator_unregister_notifier(struct regulator *regulator,
3783 struct notifier_block *nb)
3785 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
3788 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3790 /* notify regulator consumers and downstream regulator consumers.
3791 * Note mutex must be held by caller.
3793 static int _notifier_call_chain(struct regulator_dev *rdev,
3794 unsigned long event, void *data)
3796 /* call rdev chain first */
3797 return blocking_notifier_call_chain(&rdev->notifier, event, data);
3801 * regulator_bulk_get - get multiple regulator consumers
3803 * @dev: Device to supply
3804 * @num_consumers: Number of consumers to register
3805 * @consumers: Configuration of consumers; clients are stored here.
3807 * @return 0 on success, an errno on failure.
3809 * This helper function allows drivers to get several regulator
3810 * consumers in one operation. If any of the regulators cannot be
3811 * acquired then any regulators that were allocated will be freed
3812 * before returning to the caller.
3814 int regulator_bulk_get(struct device *dev, int num_consumers,
3815 struct regulator_bulk_data *consumers)
3820 for (i = 0; i < num_consumers; i++)
3821 consumers[i].consumer = NULL;
3823 for (i = 0; i < num_consumers; i++) {
3824 consumers[i].consumer = regulator_get(dev,
3825 consumers[i].supply);
3826 if (IS_ERR(consumers[i].consumer)) {
3827 ret = PTR_ERR(consumers[i].consumer);
3828 dev_err(dev, "Failed to get supply '%s': %d\n",
3829 consumers[i].supply, ret);
3830 consumers[i].consumer = NULL;
3839 regulator_put(consumers[i].consumer);
3843 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3845 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3847 struct regulator_bulk_data *bulk = data;
3849 bulk->ret = regulator_enable(bulk->consumer);
3853 * regulator_bulk_enable - enable multiple regulator consumers
3855 * @num_consumers: Number of consumers
3856 * @consumers: Consumer data; clients are stored here.
3857 * @return 0 on success, an errno on failure
3859 * This convenience API allows consumers to enable multiple regulator
3860 * clients in a single API call. If any consumers cannot be enabled
3861 * then any others that were enabled will be disabled again prior to
3864 int regulator_bulk_enable(int num_consumers,
3865 struct regulator_bulk_data *consumers)
3867 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3871 for (i = 0; i < num_consumers; i++) {
3872 if (consumers[i].consumer->always_on)
3873 consumers[i].ret = 0;
3875 async_schedule_domain(regulator_bulk_enable_async,
3876 &consumers[i], &async_domain);
3879 async_synchronize_full_domain(&async_domain);
3881 /* If any consumer failed we need to unwind any that succeeded */
3882 for (i = 0; i < num_consumers; i++) {
3883 if (consumers[i].ret != 0) {
3884 ret = consumers[i].ret;
3892 for (i = 0; i < num_consumers; i++) {
3893 if (consumers[i].ret < 0)
3894 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3897 regulator_disable(consumers[i].consumer);
3902 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3905 * regulator_bulk_disable - disable multiple regulator consumers
3907 * @num_consumers: Number of consumers
3908 * @consumers: Consumer data; clients are stored here.
3909 * @return 0 on success, an errno on failure
3911 * This convenience API allows consumers to disable multiple regulator
3912 * clients in a single API call. If any consumers cannot be disabled
3913 * then any others that were disabled will be enabled again prior to
3916 int regulator_bulk_disable(int num_consumers,
3917 struct regulator_bulk_data *consumers)
3922 for (i = num_consumers - 1; i >= 0; --i) {
3923 ret = regulator_disable(consumers[i].consumer);
3931 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3932 for (++i; i < num_consumers; ++i) {
3933 r = regulator_enable(consumers[i].consumer);
3935 pr_err("Failed to re-enable %s: %d\n",
3936 consumers[i].supply, r);
3941 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3944 * regulator_bulk_force_disable - force disable multiple regulator consumers
3946 * @num_consumers: Number of consumers
3947 * @consumers: Consumer data; clients are stored here.
3948 * @return 0 on success, an errno on failure
3950 * This convenience API allows consumers to forcibly disable multiple regulator
3951 * clients in a single API call.
3952 * NOTE: This should be used for situations when device damage will
3953 * likely occur if the regulators are not disabled (e.g. over temp).
3954 * Although regulator_force_disable function call for some consumers can
3955 * return error numbers, the function is called for all consumers.
3957 int regulator_bulk_force_disable(int num_consumers,
3958 struct regulator_bulk_data *consumers)
3963 for (i = 0; i < num_consumers; i++) {
3965 regulator_force_disable(consumers[i].consumer);
3967 /* Store first error for reporting */
3968 if (consumers[i].ret && !ret)
3969 ret = consumers[i].ret;
3974 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3977 * regulator_bulk_free - free multiple regulator consumers
3979 * @num_consumers: Number of consumers
3980 * @consumers: Consumer data; clients are stored here.
3982 * This convenience API allows consumers to free multiple regulator
3983 * clients in a single API call.
3985 void regulator_bulk_free(int num_consumers,
3986 struct regulator_bulk_data *consumers)
3990 for (i = 0; i < num_consumers; i++) {
3991 regulator_put(consumers[i].consumer);
3992 consumers[i].consumer = NULL;
3995 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3998 * regulator_notifier_call_chain - call regulator event notifier
3999 * @rdev: regulator source
4000 * @event: notifier block
4001 * @data: callback-specific data.
4003 * Called by regulator drivers to notify clients a regulator event has
4004 * occurred. We also notify regulator clients downstream.
4005 * Note lock must be held by caller.
4007 int regulator_notifier_call_chain(struct regulator_dev *rdev,
4008 unsigned long event, void *data)
4010 lockdep_assert_held_once(&rdev->mutex);
4012 _notifier_call_chain(rdev, event, data);
4016 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
4019 * regulator_mode_to_status - convert a regulator mode into a status
4021 * @mode: Mode to convert
4023 * Convert a regulator mode into a status.
4025 int regulator_mode_to_status(unsigned int mode)
4028 case REGULATOR_MODE_FAST:
4029 return REGULATOR_STATUS_FAST;
4030 case REGULATOR_MODE_NORMAL:
4031 return REGULATOR_STATUS_NORMAL;
4032 case REGULATOR_MODE_IDLE:
4033 return REGULATOR_STATUS_IDLE;
4034 case REGULATOR_MODE_STANDBY:
4035 return REGULATOR_STATUS_STANDBY;
4037 return REGULATOR_STATUS_UNDEFINED;
4040 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
4042 static struct attribute *regulator_dev_attrs[] = {
4043 &dev_attr_name.attr,
4044 &dev_attr_num_users.attr,
4045 &dev_attr_type.attr,
4046 &dev_attr_microvolts.attr,
4047 &dev_attr_microamps.attr,
4048 &dev_attr_opmode.attr,
4049 &dev_attr_state.attr,
4050 &dev_attr_status.attr,
4051 &dev_attr_bypass.attr,
4052 &dev_attr_requested_microamps.attr,
4053 &dev_attr_min_microvolts.attr,
4054 &dev_attr_max_microvolts.attr,
4055 &dev_attr_min_microamps.attr,
4056 &dev_attr_max_microamps.attr,
4057 &dev_attr_suspend_standby_state.attr,
4058 &dev_attr_suspend_mem_state.attr,
4059 &dev_attr_suspend_disk_state.attr,
4060 &dev_attr_suspend_standby_microvolts.attr,
4061 &dev_attr_suspend_mem_microvolts.attr,
4062 &dev_attr_suspend_disk_microvolts.attr,
4063 &dev_attr_suspend_standby_mode.attr,
4064 &dev_attr_suspend_mem_mode.attr,
4065 &dev_attr_suspend_disk_mode.attr,
4070 * To avoid cluttering sysfs (and memory) with useless state, only
4071 * create attributes that can be meaningfully displayed.
4073 static umode_t regulator_attr_is_visible(struct kobject *kobj,
4074 struct attribute *attr, int idx)
4076 struct device *dev = kobj_to_dev(kobj);
4077 struct regulator_dev *rdev = dev_to_rdev(dev);
4078 const struct regulator_ops *ops = rdev->desc->ops;
4079 umode_t mode = attr->mode;
4081 /* these three are always present */
4082 if (attr == &dev_attr_name.attr ||
4083 attr == &dev_attr_num_users.attr ||
4084 attr == &dev_attr_type.attr)
4087 /* some attributes need specific methods to be displayed */
4088 if (attr == &dev_attr_microvolts.attr) {
4089 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
4090 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
4091 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
4092 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
4097 if (attr == &dev_attr_microamps.attr)
4098 return ops->get_current_limit ? mode : 0;
4100 if (attr == &dev_attr_opmode.attr)
4101 return ops->get_mode ? mode : 0;
4103 if (attr == &dev_attr_state.attr)
4104 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
4106 if (attr == &dev_attr_status.attr)
4107 return ops->get_status ? mode : 0;
4109 if (attr == &dev_attr_bypass.attr)
4110 return ops->get_bypass ? mode : 0;
4112 /* some attributes are type-specific */
4113 if (attr == &dev_attr_requested_microamps.attr)
4114 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
4116 /* constraints need specific supporting methods */
4117 if (attr == &dev_attr_min_microvolts.attr ||
4118 attr == &dev_attr_max_microvolts.attr)
4119 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
4121 if (attr == &dev_attr_min_microamps.attr ||
4122 attr == &dev_attr_max_microamps.attr)
4123 return ops->set_current_limit ? mode : 0;
4125 if (attr == &dev_attr_suspend_standby_state.attr ||
4126 attr == &dev_attr_suspend_mem_state.attr ||
4127 attr == &dev_attr_suspend_disk_state.attr)
4130 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
4131 attr == &dev_attr_suspend_mem_microvolts.attr ||
4132 attr == &dev_attr_suspend_disk_microvolts.attr)
4133 return ops->set_suspend_voltage ? mode : 0;
4135 if (attr == &dev_attr_suspend_standby_mode.attr ||
4136 attr == &dev_attr_suspend_mem_mode.attr ||
4137 attr == &dev_attr_suspend_disk_mode.attr)
4138 return ops->set_suspend_mode ? mode : 0;
4143 static const struct attribute_group regulator_dev_group = {
4144 .attrs = regulator_dev_attrs,
4145 .is_visible = regulator_attr_is_visible,
4148 static const struct attribute_group *regulator_dev_groups[] = {
4149 ®ulator_dev_group,
4153 static void regulator_dev_release(struct device *dev)
4155 struct regulator_dev *rdev = dev_get_drvdata(dev);
4157 kfree(rdev->constraints);
4158 of_node_put(rdev->dev.of_node);
4162 static void rdev_init_debugfs(struct regulator_dev *rdev)
4164 struct device *parent = rdev->dev.parent;
4165 const char *rname = rdev_get_name(rdev);
4166 char name[NAME_MAX];
4168 /* Avoid duplicate debugfs directory names */
4169 if (parent && rname == rdev->desc->name) {
4170 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
4175 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
4176 if (!rdev->debugfs) {
4177 rdev_warn(rdev, "Failed to create debugfs directory\n");
4181 debugfs_create_u32("use_count", 0444, rdev->debugfs,
4183 debugfs_create_u32("open_count", 0444, rdev->debugfs,
4185 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
4186 &rdev->bypass_count);
4189 static int regulator_register_resolve_supply(struct device *dev, void *data)
4191 struct regulator_dev *rdev = dev_to_rdev(dev);
4193 if (regulator_resolve_supply(rdev))
4194 rdev_dbg(rdev, "unable to resolve supply\n");
4199 static int regulator_fill_coupling_array(struct regulator_dev *rdev)
4201 struct coupling_desc *c_desc = &rdev->coupling_desc;
4202 int n_coupled = c_desc->n_coupled;
4203 struct regulator_dev *c_rdev;
4206 for (i = 1; i < n_coupled; i++) {
4207 /* already resolved */
4208 if (c_desc->coupled_rdevs[i])
4211 c_rdev = of_parse_coupled_regulator(rdev, i - 1);
4214 c_desc->coupled_rdevs[i] = c_rdev;
4215 c_desc->n_resolved++;
4219 if (rdev->coupling_desc.n_resolved < n_coupled)
4225 static int regulator_register_fill_coupling_array(struct device *dev,
4228 struct regulator_dev *rdev = dev_to_rdev(dev);
4230 if (!IS_ENABLED(CONFIG_OF))
4233 if (regulator_fill_coupling_array(rdev))
4234 rdev_dbg(rdev, "unable to resolve coupling\n");
4239 static int regulator_resolve_coupling(struct regulator_dev *rdev)
4243 if (!IS_ENABLED(CONFIG_OF))
4246 n_phandles = of_get_n_coupled(rdev);
4248 if (n_phandles + 1 > MAX_COUPLED) {
4249 rdev_err(rdev, "too many regulators coupled\n");
4254 * Every regulator should always have coupling descriptor filled with
4255 * at least pointer to itself.
4257 rdev->coupling_desc.coupled_rdevs[0] = rdev;
4258 rdev->coupling_desc.n_coupled = n_phandles + 1;
4259 rdev->coupling_desc.n_resolved++;
4261 /* regulator isn't coupled */
4262 if (n_phandles == 0)
4265 /* regulator, which can't change its voltage, can't be coupled */
4266 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
4267 rdev_err(rdev, "voltage operation not allowed\n");
4271 if (rdev->constraints->max_spread <= 0) {
4272 rdev_err(rdev, "wrong max_spread value\n");
4276 if (!of_check_coupling_data(rdev))
4280 * After everything has been checked, try to fill rdevs array
4281 * with pointers to regulators parsed from device tree. If some
4282 * regulators are not registered yet, retry in late init call
4284 regulator_fill_coupling_array(rdev);
4290 * regulator_register - register regulator
4291 * @regulator_desc: regulator to register
4292 * @cfg: runtime configuration for regulator
4294 * Called by regulator drivers to register a regulator.
4295 * Returns a valid pointer to struct regulator_dev on success
4296 * or an ERR_PTR() on error.
4298 struct regulator_dev *
4299 regulator_register(const struct regulator_desc *regulator_desc,
4300 const struct regulator_config *cfg)
4302 const struct regulator_init_data *init_data;
4303 struct regulator_config *config = NULL;
4304 static atomic_t regulator_no = ATOMIC_INIT(-1);
4305 struct regulator_dev *rdev;
4309 if (regulator_desc == NULL || cfg == NULL)
4310 return ERR_PTR(-EINVAL);
4315 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
4316 return ERR_PTR(-EINVAL);
4318 if (regulator_desc->type != REGULATOR_VOLTAGE &&
4319 regulator_desc->type != REGULATOR_CURRENT)
4320 return ERR_PTR(-EINVAL);
4322 /* Only one of each should be implemented */
4323 WARN_ON(regulator_desc->ops->get_voltage &&
4324 regulator_desc->ops->get_voltage_sel);
4325 WARN_ON(regulator_desc->ops->set_voltage &&
4326 regulator_desc->ops->set_voltage_sel);
4328 /* If we're using selectors we must implement list_voltage. */
4329 if (regulator_desc->ops->get_voltage_sel &&
4330 !regulator_desc->ops->list_voltage) {
4331 return ERR_PTR(-EINVAL);
4333 if (regulator_desc->ops->set_voltage_sel &&
4334 !regulator_desc->ops->list_voltage) {
4335 return ERR_PTR(-EINVAL);
4338 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
4340 return ERR_PTR(-ENOMEM);
4343 * Duplicate the config so the driver could override it after
4344 * parsing init data.
4346 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
4347 if (config == NULL) {
4349 return ERR_PTR(-ENOMEM);
4352 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
4353 &rdev->dev.of_node);
4355 init_data = config->init_data;
4356 rdev->dev.of_node = of_node_get(config->of_node);
4359 mutex_init(&rdev->mutex);
4360 rdev->reg_data = config->driver_data;
4361 rdev->owner = regulator_desc->owner;
4362 rdev->desc = regulator_desc;
4364 rdev->regmap = config->regmap;
4365 else if (dev_get_regmap(dev, NULL))
4366 rdev->regmap = dev_get_regmap(dev, NULL);
4367 else if (dev->parent)
4368 rdev->regmap = dev_get_regmap(dev->parent, NULL);
4369 INIT_LIST_HEAD(&rdev->consumer_list);
4370 INIT_LIST_HEAD(&rdev->list);
4371 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
4372 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
4374 /* preform any regulator specific init */
4375 if (init_data && init_data->regulator_init) {
4376 ret = init_data->regulator_init(rdev->reg_data);
4381 if (config->ena_gpiod ||
4382 ((config->ena_gpio || config->ena_gpio_initialized) &&
4383 gpio_is_valid(config->ena_gpio))) {
4384 mutex_lock(®ulator_list_mutex);
4385 ret = regulator_ena_gpio_request(rdev, config);
4386 mutex_unlock(®ulator_list_mutex);
4388 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
4389 config->ena_gpio, ret);
4394 /* register with sysfs */
4395 rdev->dev.class = ®ulator_class;
4396 rdev->dev.parent = dev;
4397 dev_set_name(&rdev->dev, "regulator.%lu",
4398 (unsigned long) atomic_inc_return(®ulator_no));
4400 /* set regulator constraints */
4402 rdev->constraints = kmemdup(&init_data->constraints,
4403 sizeof(*rdev->constraints),
4406 rdev->constraints = kzalloc(sizeof(*rdev->constraints),
4408 if (!rdev->constraints) {
4413 if (init_data && init_data->supply_regulator)
4414 rdev->supply_name = init_data->supply_regulator;
4415 else if (regulator_desc->supply_name)
4416 rdev->supply_name = regulator_desc->supply_name;
4418 ret = set_machine_constraints(rdev);
4419 if (ret == -EPROBE_DEFER) {
4420 /* Regulator might be in bypass mode and so needs its supply
4421 * to set the constraints */
4422 /* FIXME: this currently triggers a chicken-and-egg problem
4423 * when creating -SUPPLY symlink in sysfs to a regulator
4424 * that is just being created */
4425 ret = regulator_resolve_supply(rdev);
4427 ret = set_machine_constraints(rdev);
4429 rdev_dbg(rdev, "unable to resolve supply early: %pe\n",
4435 mutex_lock(®ulator_list_mutex);
4436 ret = regulator_resolve_coupling(rdev);
4437 mutex_unlock(®ulator_list_mutex);
4442 /* add consumers devices */
4444 for (i = 0; i < init_data->num_consumer_supplies; i++) {
4445 ret = set_consumer_device_supply(rdev,
4446 init_data->consumer_supplies[i].dev_name,
4447 init_data->consumer_supplies[i].supply);
4449 dev_err(dev, "Failed to set supply %s\n",
4450 init_data->consumer_supplies[i].supply);
4451 goto unset_supplies;
4456 if (!rdev->desc->ops->get_voltage &&
4457 !rdev->desc->ops->list_voltage &&
4458 !rdev->desc->fixed_uV)
4459 rdev->is_switch = true;
4461 dev_set_drvdata(&rdev->dev, rdev);
4462 ret = device_register(&rdev->dev);
4464 put_device(&rdev->dev);
4465 goto unset_supplies;
4468 rdev_init_debugfs(rdev);
4470 /* try to resolve regulators supply since a new one was registered */
4471 class_for_each_device(®ulator_class, NULL, NULL,
4472 regulator_register_resolve_supply);
4477 mutex_lock(®ulator_list_mutex);
4478 unset_regulator_supplies(rdev);
4479 mutex_unlock(®ulator_list_mutex);
4481 kfree(rdev->constraints);
4482 mutex_lock(®ulator_list_mutex);
4483 regulator_ena_gpio_free(rdev);
4484 mutex_unlock(®ulator_list_mutex);
4488 return ERR_PTR(ret);
4490 EXPORT_SYMBOL_GPL(regulator_register);
4493 * regulator_unregister - unregister regulator
4494 * @rdev: regulator to unregister
4496 * Called by regulator drivers to unregister a regulator.
4498 void regulator_unregister(struct regulator_dev *rdev)
4504 while (rdev->use_count--)
4505 regulator_disable(rdev->supply);
4506 regulator_put(rdev->supply);
4508 mutex_lock(®ulator_list_mutex);
4509 debugfs_remove_recursive(rdev->debugfs);
4510 flush_work(&rdev->disable_work.work);
4511 WARN_ON(rdev->open_count);
4512 unset_regulator_supplies(rdev);
4513 list_del(&rdev->list);
4514 regulator_ena_gpio_free(rdev);
4515 mutex_unlock(®ulator_list_mutex);
4516 device_unregister(&rdev->dev);
4518 EXPORT_SYMBOL_GPL(regulator_unregister);
4520 #ifdef CONFIG_SUSPEND
4521 static int _regulator_suspend(struct device *dev, void *data)
4523 struct regulator_dev *rdev = dev_to_rdev(dev);
4524 suspend_state_t *state = data;
4527 regulator_lock(rdev);
4528 ret = suspend_set_state(rdev, *state);
4529 regulator_unlock(rdev);
4535 * regulator_suspend - prepare regulators for system wide suspend
4536 * @state: system suspend state
4538 * Configure each regulator with it's suspend operating parameters for state.
4540 static int regulator_suspend(struct device *dev)
4542 suspend_state_t state = pm_suspend_target_state;
4544 return class_for_each_device(®ulator_class, NULL, &state,
4545 _regulator_suspend);
4548 static int _regulator_resume(struct device *dev, void *data)
4551 struct regulator_dev *rdev = dev_to_rdev(dev);
4552 suspend_state_t *state = data;
4553 struct regulator_state *rstate;
4555 rstate = regulator_get_suspend_state(rdev, *state);
4559 regulator_lock(rdev);
4561 if (rdev->desc->ops->resume &&
4562 (rstate->enabled == ENABLE_IN_SUSPEND ||
4563 rstate->enabled == DISABLE_IN_SUSPEND))
4564 ret = rdev->desc->ops->resume(rdev);
4566 regulator_unlock(rdev);
4571 static int regulator_resume(struct device *dev)
4573 suspend_state_t state = pm_suspend_target_state;
4575 return class_for_each_device(®ulator_class, NULL, &state,
4579 #else /* !CONFIG_SUSPEND */
4581 #define regulator_suspend NULL
4582 #define regulator_resume NULL
4584 #endif /* !CONFIG_SUSPEND */
4587 static const struct dev_pm_ops __maybe_unused regulator_pm_ops = {
4588 .suspend = regulator_suspend,
4589 .resume = regulator_resume,
4593 struct class regulator_class = {
4594 .name = "regulator",
4595 .dev_release = regulator_dev_release,
4596 .dev_groups = regulator_dev_groups,
4598 .pm = ®ulator_pm_ops,
4602 * regulator_has_full_constraints - the system has fully specified constraints
4604 * Calling this function will cause the regulator API to disable all
4605 * regulators which have a zero use count and don't have an always_on
4606 * constraint in a late_initcall.
4608 * The intention is that this will become the default behaviour in a
4609 * future kernel release so users are encouraged to use this facility
4612 void regulator_has_full_constraints(void)
4614 has_full_constraints = 1;
4616 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4619 * rdev_get_drvdata - get rdev regulator driver data
4622 * Get rdev regulator driver private data. This call can be used in the
4623 * regulator driver context.
4625 void *rdev_get_drvdata(struct regulator_dev *rdev)
4627 return rdev->reg_data;
4629 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4632 * regulator_get_drvdata - get regulator driver data
4633 * @regulator: regulator
4635 * Get regulator driver private data. This call can be used in the consumer
4636 * driver context when non API regulator specific functions need to be called.
4638 void *regulator_get_drvdata(struct regulator *regulator)
4640 return regulator->rdev->reg_data;
4642 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4645 * regulator_set_drvdata - set regulator driver data
4646 * @regulator: regulator
4649 void regulator_set_drvdata(struct regulator *regulator, void *data)
4651 regulator->rdev->reg_data = data;
4653 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4656 * regulator_get_id - get regulator ID
4659 int rdev_get_id(struct regulator_dev *rdev)
4661 return rdev->desc->id;
4663 EXPORT_SYMBOL_GPL(rdev_get_id);
4665 struct device *rdev_get_dev(struct regulator_dev *rdev)
4669 EXPORT_SYMBOL_GPL(rdev_get_dev);
4671 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4673 return reg_init_data->driver_data;
4675 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4677 #ifdef CONFIG_DEBUG_FS
4678 static int supply_map_show(struct seq_file *sf, void *data)
4680 struct regulator_map *map;
4682 list_for_each_entry(map, ®ulator_map_list, list) {
4683 seq_printf(sf, "%s -> %s.%s\n",
4684 rdev_get_name(map->regulator), map->dev_name,
4691 static int supply_map_open(struct inode *inode, struct file *file)
4693 return single_open(file, supply_map_show, inode->i_private);
4697 static const struct file_operations supply_map_fops = {
4698 #ifdef CONFIG_DEBUG_FS
4699 .open = supply_map_open,
4701 .llseek = seq_lseek,
4702 .release = single_release,
4706 #ifdef CONFIG_DEBUG_FS
4707 struct summary_data {
4709 struct regulator_dev *parent;
4713 static void regulator_summary_show_subtree(struct seq_file *s,
4714 struct regulator_dev *rdev,
4717 static int regulator_summary_show_children(struct device *dev, void *data)
4719 struct regulator_dev *rdev = dev_to_rdev(dev);
4720 struct summary_data *summary_data = data;
4722 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
4723 regulator_summary_show_subtree(summary_data->s, rdev,
4724 summary_data->level + 1);
4729 static void regulator_summary_show_subtree(struct seq_file *s,
4730 struct regulator_dev *rdev,
4733 struct regulation_constraints *c;
4734 struct regulator *consumer;
4735 struct summary_data summary_data;
4740 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4742 30 - level * 3, rdev_get_name(rdev),
4743 rdev->use_count, rdev->open_count, rdev->bypass_count);
4745 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4746 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
4748 c = rdev->constraints;
4750 switch (rdev->desc->type) {
4751 case REGULATOR_VOLTAGE:
4752 seq_printf(s, "%5dmV %5dmV ",
4753 c->min_uV / 1000, c->max_uV / 1000);
4755 case REGULATOR_CURRENT:
4756 seq_printf(s, "%5dmA %5dmA ",
4757 c->min_uA / 1000, c->max_uA / 1000);
4764 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4765 if (consumer->dev && consumer->dev->class == ®ulator_class)
4768 seq_printf(s, "%*s%-*s ",
4769 (level + 1) * 3 + 1, "",
4770 30 - (level + 1) * 3,
4771 consumer->dev ? dev_name(consumer->dev) : "deviceless");
4773 switch (rdev->desc->type) {
4774 case REGULATOR_VOLTAGE:
4775 seq_printf(s, "%37dmV %5dmV",
4776 consumer->voltage[PM_SUSPEND_ON].min_uV / 1000,
4777 consumer->voltage[PM_SUSPEND_ON].max_uV / 1000);
4779 case REGULATOR_CURRENT:
4787 summary_data.level = level;
4788 summary_data.parent = rdev;
4790 class_for_each_device(®ulator_class, NULL, &summary_data,
4791 regulator_summary_show_children);
4794 static int regulator_summary_show_roots(struct device *dev, void *data)
4796 struct regulator_dev *rdev = dev_to_rdev(dev);
4797 struct seq_file *s = data;
4800 regulator_summary_show_subtree(s, rdev, 0);
4805 static int regulator_summary_show(struct seq_file *s, void *data)
4807 seq_puts(s, " regulator use open bypass voltage current min max\n");
4808 seq_puts(s, "-------------------------------------------------------------------------------\n");
4810 class_for_each_device(®ulator_class, NULL, s,
4811 regulator_summary_show_roots);
4816 static int regulator_summary_open(struct inode *inode, struct file *file)
4818 return single_open(file, regulator_summary_show, inode->i_private);
4822 static const struct file_operations regulator_summary_fops = {
4823 #ifdef CONFIG_DEBUG_FS
4824 .open = regulator_summary_open,
4826 .llseek = seq_lseek,
4827 .release = single_release,
4831 static int __init regulator_init(void)
4835 ret = class_register(®ulator_class);
4837 debugfs_root = debugfs_create_dir("regulator", NULL);
4839 pr_warn("regulator: Failed to create debugfs directory\n");
4841 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4844 debugfs_create_file("regulator_summary", 0444, debugfs_root,
4845 NULL, ®ulator_summary_fops);
4847 regulator_dummy_init();
4852 /* init early to allow our consumers to complete system booting */
4853 core_initcall(regulator_init);
4855 static int regulator_late_cleanup(struct device *dev, void *data)
4857 struct regulator_dev *rdev = dev_to_rdev(dev);
4858 const struct regulator_ops *ops = rdev->desc->ops;
4859 struct regulation_constraints *c = rdev->constraints;
4862 if (c && c->always_on)
4865 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS))
4868 regulator_lock(rdev);
4870 if (rdev->use_count)
4873 /* If we can't read the status assume it's on. */
4874 if (ops->is_enabled)
4875 enabled = ops->is_enabled(rdev);
4882 if (have_full_constraints()) {
4883 /* We log since this may kill the system if it goes
4885 rdev_info(rdev, "disabling\n");
4886 ret = _regulator_do_disable(rdev);
4888 rdev_err(rdev, "couldn't disable: %d\n", ret);
4890 /* The intention is that in future we will
4891 * assume that full constraints are provided
4892 * so warn even if we aren't going to do
4895 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4899 regulator_unlock(rdev);
4904 static void regulator_init_complete_work_function(struct work_struct *work)
4907 * Regulators may had failed to resolve their input supplies
4908 * when were registered, either because the input supply was
4909 * not registered yet or because its parent device was not
4910 * bound yet. So attempt to resolve the input supplies for
4911 * pending regulators before trying to disable unused ones.
4913 class_for_each_device(®ulator_class, NULL, NULL,
4914 regulator_register_resolve_supply);
4916 /* If we have a full configuration then disable any regulators
4917 * we have permission to change the status for and which are
4918 * not in use or always_on. This is effectively the default
4919 * for DT and ACPI as they have full constraints.
4921 class_for_each_device(®ulator_class, NULL, NULL,
4922 regulator_late_cleanup);
4925 static DECLARE_DELAYED_WORK(regulator_init_complete_work,
4926 regulator_init_complete_work_function);
4928 static int __init regulator_init_complete(void)
4931 * Since DT doesn't provide an idiomatic mechanism for
4932 * enabling full constraints and since it's much more natural
4933 * with DT to provide them just assume that a DT enabled
4934 * system has full constraints.
4936 if (of_have_populated_dt())
4937 has_full_constraints = true;
4940 * We punt completion for an arbitrary amount of time since
4941 * systems like distros will load many drivers from userspace
4942 * so consumers might not always be ready yet, this is
4943 * particularly an issue with laptops where this might bounce
4944 * the display off then on. Ideally we'd get a notification
4945 * from userspace when this happens but we don't so just wait
4946 * a bit and hope we waited long enough. It'd be better if
4947 * we'd only do this on systems that need it, and a kernel
4948 * command line option might be useful.
4950 schedule_delayed_work(®ulator_init_complete_work,
4951 msecs_to_jiffies(30000));
4953 class_for_each_device(®ulator_class, NULL, NULL,
4954 regulator_register_fill_coupling_array);
4958 late_initcall_sync(regulator_init_complete);