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/consumer.h>
28 #include <linux/regmap.h>
29 #include <linux/regulator/of_regulator.h>
30 #include <linux/regulator/consumer.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/machine.h>
33 #include <linux/module.h>
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/regulator.h>
41 #define rdev_crit(rdev, fmt, ...) \
42 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
43 #define rdev_err(rdev, fmt, ...) \
44 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
45 #define rdev_warn(rdev, fmt, ...) \
46 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
47 #define rdev_info(rdev, fmt, ...) \
48 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
49 #define rdev_dbg(rdev, fmt, ...) \
50 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
52 static DEFINE_WW_CLASS(regulator_ww_class);
53 static DEFINE_MUTEX(regulator_nesting_mutex);
54 static DEFINE_MUTEX(regulator_list_mutex);
55 static LIST_HEAD(regulator_map_list);
56 static LIST_HEAD(regulator_ena_gpio_list);
57 static LIST_HEAD(regulator_supply_alias_list);
58 static bool has_full_constraints;
60 static struct dentry *debugfs_root;
63 * struct regulator_map
65 * Used to provide symbolic supply names to devices.
67 struct regulator_map {
68 struct list_head list;
69 const char *dev_name; /* The dev_name() for the consumer */
71 struct regulator_dev *regulator;
75 * struct regulator_enable_gpio
77 * Management for shared enable GPIO pin
79 struct regulator_enable_gpio {
80 struct list_head list;
81 struct gpio_desc *gpiod;
82 u32 enable_count; /* a number of enabled shared GPIO */
83 u32 request_count; /* a number of requested shared GPIO */
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 *regulator);
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 int regulator_balance_voltage(struct regulator_dev *rdev,
109 suspend_state_t state);
110 static int regulator_set_voltage_rdev(struct regulator_dev *rdev,
111 int min_uV, int max_uV,
112 suspend_state_t state);
113 static struct regulator *create_regulator(struct regulator_dev *rdev,
115 const char *supply_name);
116 static void _regulator_put(struct regulator *regulator);
118 static const char *rdev_get_name(struct regulator_dev *rdev)
120 if (rdev->constraints && rdev->constraints->name)
121 return rdev->constraints->name;
122 else if (rdev->desc->name)
123 return rdev->desc->name;
128 static bool have_full_constraints(void)
130 return has_full_constraints || of_have_populated_dt();
133 static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops)
135 if (!rdev->constraints) {
136 rdev_err(rdev, "no constraints\n");
140 if (rdev->constraints->valid_ops_mask & ops)
147 * regulator_lock_nested - lock a single regulator
148 * @rdev: regulator source
149 * @ww_ctx: w/w mutex acquire context
151 * This function can be called many times by one task on
152 * a single regulator and its mutex will be locked only
153 * once. If a task, which is calling this function is other
154 * than the one, which initially locked the mutex, it will
157 static inline int regulator_lock_nested(struct regulator_dev *rdev,
158 struct ww_acquire_ctx *ww_ctx)
163 mutex_lock(®ulator_nesting_mutex);
165 if (ww_ctx || !ww_mutex_trylock(&rdev->mutex)) {
166 if (rdev->mutex_owner == current)
172 mutex_unlock(®ulator_nesting_mutex);
173 ret = ww_mutex_lock(&rdev->mutex, ww_ctx);
174 mutex_lock(®ulator_nesting_mutex);
180 if (lock && ret != -EDEADLK) {
182 rdev->mutex_owner = current;
185 mutex_unlock(®ulator_nesting_mutex);
191 * regulator_lock - lock a single regulator
192 * @rdev: regulator source
194 * This function can be called many times by one task on
195 * a single regulator and its mutex will be locked only
196 * once. If a task, which is calling this function is other
197 * than the one, which initially locked the mutex, it will
200 void regulator_lock(struct regulator_dev *rdev)
202 regulator_lock_nested(rdev, NULL);
204 EXPORT_SYMBOL_GPL(regulator_lock);
207 * regulator_unlock - unlock a single regulator
208 * @rdev: regulator_source
210 * This function unlocks the mutex when the
211 * reference counter reaches 0.
213 void regulator_unlock(struct regulator_dev *rdev)
215 mutex_lock(®ulator_nesting_mutex);
217 if (--rdev->ref_cnt == 0) {
218 rdev->mutex_owner = NULL;
219 ww_mutex_unlock(&rdev->mutex);
222 WARN_ON_ONCE(rdev->ref_cnt < 0);
224 mutex_unlock(®ulator_nesting_mutex);
226 EXPORT_SYMBOL_GPL(regulator_unlock);
228 static bool regulator_supply_is_couple(struct regulator_dev *rdev)
230 struct regulator_dev *c_rdev;
233 for (i = 1; i < rdev->coupling_desc.n_coupled; i++) {
234 c_rdev = rdev->coupling_desc.coupled_rdevs[i];
236 if (rdev->supply->rdev == c_rdev)
243 static void regulator_unlock_recursive(struct regulator_dev *rdev,
244 unsigned int n_coupled)
246 struct regulator_dev *c_rdev;
249 for (i = n_coupled; i > 0; i--) {
250 c_rdev = rdev->coupling_desc.coupled_rdevs[i - 1];
255 if (c_rdev->supply && !regulator_supply_is_couple(c_rdev))
256 regulator_unlock_recursive(
257 c_rdev->supply->rdev,
258 c_rdev->coupling_desc.n_coupled);
260 regulator_unlock(c_rdev);
264 static int regulator_lock_recursive(struct regulator_dev *rdev,
265 struct regulator_dev **new_contended_rdev,
266 struct regulator_dev **old_contended_rdev,
267 struct ww_acquire_ctx *ww_ctx)
269 struct regulator_dev *c_rdev;
272 for (i = 0; i < rdev->coupling_desc.n_coupled; i++) {
273 c_rdev = rdev->coupling_desc.coupled_rdevs[i];
278 if (c_rdev != *old_contended_rdev) {
279 err = regulator_lock_nested(c_rdev, ww_ctx);
281 if (err == -EDEADLK) {
282 *new_contended_rdev = c_rdev;
286 /* shouldn't happen */
287 WARN_ON_ONCE(err != -EALREADY);
290 *old_contended_rdev = NULL;
293 if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) {
294 err = regulator_lock_recursive(c_rdev->supply->rdev,
299 regulator_unlock(c_rdev);
308 regulator_unlock_recursive(rdev, i);
314 * regulator_unlock_dependent - unlock regulator's suppliers and coupled
316 * @rdev: regulator source
317 * @ww_ctx: w/w mutex acquire context
319 * Unlock all regulators related with rdev by coupling or supplying.
321 static void regulator_unlock_dependent(struct regulator_dev *rdev,
322 struct ww_acquire_ctx *ww_ctx)
324 regulator_unlock_recursive(rdev, rdev->coupling_desc.n_coupled);
325 ww_acquire_fini(ww_ctx);
329 * regulator_lock_dependent - lock regulator's suppliers and coupled regulators
330 * @rdev: regulator source
331 * @ww_ctx: w/w mutex acquire context
333 * This function as a wrapper on regulator_lock_recursive(), which locks
334 * all regulators related with rdev by coupling or supplying.
336 static void regulator_lock_dependent(struct regulator_dev *rdev,
337 struct ww_acquire_ctx *ww_ctx)
339 struct regulator_dev *new_contended_rdev = NULL;
340 struct regulator_dev *old_contended_rdev = NULL;
343 mutex_lock(®ulator_list_mutex);
345 ww_acquire_init(ww_ctx, ®ulator_ww_class);
348 if (new_contended_rdev) {
349 ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx);
350 old_contended_rdev = new_contended_rdev;
351 old_contended_rdev->ref_cnt++;
354 err = regulator_lock_recursive(rdev,
359 if (old_contended_rdev)
360 regulator_unlock(old_contended_rdev);
362 } while (err == -EDEADLK);
364 ww_acquire_done(ww_ctx);
366 mutex_unlock(®ulator_list_mutex);
370 * of_get_child_regulator - get a child regulator device node
371 * based on supply name
372 * @parent: Parent device node
373 * @prop_name: Combination regulator supply name and "-supply"
375 * Traverse all child nodes.
376 * Extract the child regulator device node corresponding to the supply name.
377 * returns the device node corresponding to the regulator if found, else
380 static struct device_node *of_get_child_regulator(struct device_node *parent,
381 const char *prop_name)
383 struct device_node *regnode = NULL;
384 struct device_node *child = NULL;
386 for_each_child_of_node(parent, child) {
387 regnode = of_parse_phandle(child, prop_name, 0);
390 regnode = of_get_child_regulator(child, prop_name);
401 * of_get_regulator - get a regulator device node based on supply name
402 * @dev: Device pointer for the consumer (of regulator) device
403 * @supply: regulator supply name
405 * Extract the regulator device node corresponding to the supply name.
406 * returns the device node corresponding to the regulator if found, else
409 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
411 struct device_node *regnode = NULL;
412 char prop_name[32]; /* 32 is max size of property name */
414 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
416 snprintf(prop_name, 32, "%s-supply", supply);
417 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
420 regnode = of_get_child_regulator(dev->of_node, prop_name);
424 dev_dbg(dev, "Looking up %s property in node %pOF failed\n",
425 prop_name, dev->of_node);
431 /* Platform voltage constraint check */
432 static int regulator_check_voltage(struct regulator_dev *rdev,
433 int *min_uV, int *max_uV)
435 BUG_ON(*min_uV > *max_uV);
437 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
438 rdev_err(rdev, "voltage operation not allowed\n");
442 if (*max_uV > rdev->constraints->max_uV)
443 *max_uV = rdev->constraints->max_uV;
444 if (*min_uV < rdev->constraints->min_uV)
445 *min_uV = rdev->constraints->min_uV;
447 if (*min_uV > *max_uV) {
448 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
456 /* return 0 if the state is valid */
457 static int regulator_check_states(suspend_state_t state)
459 return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE);
462 /* Make sure we select a voltage that suits the needs of all
463 * regulator consumers
465 static int regulator_check_consumers(struct regulator_dev *rdev,
466 int *min_uV, int *max_uV,
467 suspend_state_t state)
469 struct regulator *regulator;
470 struct regulator_voltage *voltage;
472 list_for_each_entry(regulator, &rdev->consumer_list, list) {
473 voltage = ®ulator->voltage[state];
475 * Assume consumers that didn't say anything are OK
476 * with anything in the constraint range.
478 if (!voltage->min_uV && !voltage->max_uV)
481 if (*max_uV > voltage->max_uV)
482 *max_uV = voltage->max_uV;
483 if (*min_uV < voltage->min_uV)
484 *min_uV = voltage->min_uV;
487 if (*min_uV > *max_uV) {
488 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
496 /* current constraint check */
497 static int regulator_check_current_limit(struct regulator_dev *rdev,
498 int *min_uA, int *max_uA)
500 BUG_ON(*min_uA > *max_uA);
502 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) {
503 rdev_err(rdev, "current operation not allowed\n");
507 if (*max_uA > rdev->constraints->max_uA)
508 *max_uA = rdev->constraints->max_uA;
509 if (*min_uA < rdev->constraints->min_uA)
510 *min_uA = rdev->constraints->min_uA;
512 if (*min_uA > *max_uA) {
513 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
521 /* operating mode constraint check */
522 static int regulator_mode_constrain(struct regulator_dev *rdev,
526 case REGULATOR_MODE_FAST:
527 case REGULATOR_MODE_NORMAL:
528 case REGULATOR_MODE_IDLE:
529 case REGULATOR_MODE_STANDBY:
532 rdev_err(rdev, "invalid mode %x specified\n", *mode);
536 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) {
537 rdev_err(rdev, "mode operation not allowed\n");
541 /* The modes are bitmasks, the most power hungry modes having
542 * the lowest values. If the requested mode isn't supported
543 * try higher modes. */
545 if (rdev->constraints->valid_modes_mask & *mode)
553 static inline struct regulator_state *
554 regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state)
556 if (rdev->constraints == NULL)
560 case PM_SUSPEND_STANDBY:
561 return &rdev->constraints->state_standby;
563 return &rdev->constraints->state_mem;
565 return &rdev->constraints->state_disk;
571 static ssize_t regulator_uV_show(struct device *dev,
572 struct device_attribute *attr, char *buf)
574 struct regulator_dev *rdev = dev_get_drvdata(dev);
577 regulator_lock(rdev);
578 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
579 regulator_unlock(rdev);
583 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
585 static ssize_t regulator_uA_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
588 struct regulator_dev *rdev = dev_get_drvdata(dev);
590 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
592 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
594 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
597 struct regulator_dev *rdev = dev_get_drvdata(dev);
599 return sprintf(buf, "%s\n", rdev_get_name(rdev));
601 static DEVICE_ATTR_RO(name);
603 static const char *regulator_opmode_to_str(int mode)
606 case REGULATOR_MODE_FAST:
608 case REGULATOR_MODE_NORMAL:
610 case REGULATOR_MODE_IDLE:
612 case REGULATOR_MODE_STANDBY:
618 static ssize_t regulator_print_opmode(char *buf, int mode)
620 return sprintf(buf, "%s\n", regulator_opmode_to_str(mode));
623 static ssize_t regulator_opmode_show(struct device *dev,
624 struct device_attribute *attr, char *buf)
626 struct regulator_dev *rdev = dev_get_drvdata(dev);
628 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
630 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
632 static ssize_t regulator_print_state(char *buf, int state)
635 return sprintf(buf, "enabled\n");
637 return sprintf(buf, "disabled\n");
639 return sprintf(buf, "unknown\n");
642 static ssize_t regulator_state_show(struct device *dev,
643 struct device_attribute *attr, char *buf)
645 struct regulator_dev *rdev = dev_get_drvdata(dev);
648 regulator_lock(rdev);
649 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
650 regulator_unlock(rdev);
654 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
656 static ssize_t regulator_status_show(struct device *dev,
657 struct device_attribute *attr, char *buf)
659 struct regulator_dev *rdev = dev_get_drvdata(dev);
663 status = rdev->desc->ops->get_status(rdev);
668 case REGULATOR_STATUS_OFF:
671 case REGULATOR_STATUS_ON:
674 case REGULATOR_STATUS_ERROR:
677 case REGULATOR_STATUS_FAST:
680 case REGULATOR_STATUS_NORMAL:
683 case REGULATOR_STATUS_IDLE:
686 case REGULATOR_STATUS_STANDBY:
689 case REGULATOR_STATUS_BYPASS:
692 case REGULATOR_STATUS_UNDEFINED:
699 return sprintf(buf, "%s\n", label);
701 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
703 static ssize_t regulator_min_uA_show(struct device *dev,
704 struct device_attribute *attr, char *buf)
706 struct regulator_dev *rdev = dev_get_drvdata(dev);
708 if (!rdev->constraints)
709 return sprintf(buf, "constraint not defined\n");
711 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
713 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
715 static ssize_t regulator_max_uA_show(struct device *dev,
716 struct device_attribute *attr, char *buf)
718 struct regulator_dev *rdev = dev_get_drvdata(dev);
720 if (!rdev->constraints)
721 return sprintf(buf, "constraint not defined\n");
723 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
725 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
727 static ssize_t regulator_min_uV_show(struct device *dev,
728 struct device_attribute *attr, char *buf)
730 struct regulator_dev *rdev = dev_get_drvdata(dev);
732 if (!rdev->constraints)
733 return sprintf(buf, "constraint not defined\n");
735 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
737 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
739 static ssize_t regulator_max_uV_show(struct device *dev,
740 struct device_attribute *attr, char *buf)
742 struct regulator_dev *rdev = dev_get_drvdata(dev);
744 if (!rdev->constraints)
745 return sprintf(buf, "constraint not defined\n");
747 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
749 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
751 static ssize_t regulator_total_uA_show(struct device *dev,
752 struct device_attribute *attr, char *buf)
754 struct regulator_dev *rdev = dev_get_drvdata(dev);
755 struct regulator *regulator;
758 regulator_lock(rdev);
759 list_for_each_entry(regulator, &rdev->consumer_list, list) {
760 if (regulator->enable_count)
761 uA += regulator->uA_load;
763 regulator_unlock(rdev);
764 return sprintf(buf, "%d\n", uA);
766 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
768 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
771 struct regulator_dev *rdev = dev_get_drvdata(dev);
772 return sprintf(buf, "%d\n", rdev->use_count);
774 static DEVICE_ATTR_RO(num_users);
776 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
779 struct regulator_dev *rdev = dev_get_drvdata(dev);
781 switch (rdev->desc->type) {
782 case REGULATOR_VOLTAGE:
783 return sprintf(buf, "voltage\n");
784 case REGULATOR_CURRENT:
785 return sprintf(buf, "current\n");
787 return sprintf(buf, "unknown\n");
789 static DEVICE_ATTR_RO(type);
791 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
792 struct device_attribute *attr, char *buf)
794 struct regulator_dev *rdev = dev_get_drvdata(dev);
796 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
798 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
799 regulator_suspend_mem_uV_show, NULL);
801 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
802 struct device_attribute *attr, char *buf)
804 struct regulator_dev *rdev = dev_get_drvdata(dev);
806 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
808 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
809 regulator_suspend_disk_uV_show, NULL);
811 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
812 struct device_attribute *attr, char *buf)
814 struct regulator_dev *rdev = dev_get_drvdata(dev);
816 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
818 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
819 regulator_suspend_standby_uV_show, NULL);
821 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
822 struct device_attribute *attr, char *buf)
824 struct regulator_dev *rdev = dev_get_drvdata(dev);
826 return regulator_print_opmode(buf,
827 rdev->constraints->state_mem.mode);
829 static DEVICE_ATTR(suspend_mem_mode, 0444,
830 regulator_suspend_mem_mode_show, NULL);
832 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
833 struct device_attribute *attr, char *buf)
835 struct regulator_dev *rdev = dev_get_drvdata(dev);
837 return regulator_print_opmode(buf,
838 rdev->constraints->state_disk.mode);
840 static DEVICE_ATTR(suspend_disk_mode, 0444,
841 regulator_suspend_disk_mode_show, NULL);
843 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
844 struct device_attribute *attr, char *buf)
846 struct regulator_dev *rdev = dev_get_drvdata(dev);
848 return regulator_print_opmode(buf,
849 rdev->constraints->state_standby.mode);
851 static DEVICE_ATTR(suspend_standby_mode, 0444,
852 regulator_suspend_standby_mode_show, NULL);
854 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
855 struct device_attribute *attr, char *buf)
857 struct regulator_dev *rdev = dev_get_drvdata(dev);
859 return regulator_print_state(buf,
860 rdev->constraints->state_mem.enabled);
862 static DEVICE_ATTR(suspend_mem_state, 0444,
863 regulator_suspend_mem_state_show, NULL);
865 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
866 struct device_attribute *attr, char *buf)
868 struct regulator_dev *rdev = dev_get_drvdata(dev);
870 return regulator_print_state(buf,
871 rdev->constraints->state_disk.enabled);
873 static DEVICE_ATTR(suspend_disk_state, 0444,
874 regulator_suspend_disk_state_show, NULL);
876 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
877 struct device_attribute *attr, char *buf)
879 struct regulator_dev *rdev = dev_get_drvdata(dev);
881 return regulator_print_state(buf,
882 rdev->constraints->state_standby.enabled);
884 static DEVICE_ATTR(suspend_standby_state, 0444,
885 regulator_suspend_standby_state_show, NULL);
887 static ssize_t regulator_bypass_show(struct device *dev,
888 struct device_attribute *attr, char *buf)
890 struct regulator_dev *rdev = dev_get_drvdata(dev);
895 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
904 return sprintf(buf, "%s\n", report);
906 static DEVICE_ATTR(bypass, 0444,
907 regulator_bypass_show, NULL);
909 /* Calculate the new optimum regulator operating mode based on the new total
910 * consumer load. All locks held by caller */
911 static int drms_uA_update(struct regulator_dev *rdev)
913 struct regulator *sibling;
914 int current_uA = 0, output_uV, input_uV, err;
918 * first check to see if we can set modes at all, otherwise just
919 * tell the consumer everything is OK.
921 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) {
922 rdev_dbg(rdev, "DRMS operation not allowed\n");
926 if (!rdev->desc->ops->get_optimum_mode &&
927 !rdev->desc->ops->set_load)
930 if (!rdev->desc->ops->set_mode &&
931 !rdev->desc->ops->set_load)
934 /* calc total requested load */
935 list_for_each_entry(sibling, &rdev->consumer_list, list) {
936 if (sibling->enable_count)
937 current_uA += sibling->uA_load;
940 current_uA += rdev->constraints->system_load;
942 if (rdev->desc->ops->set_load) {
943 /* set the optimum mode for our new total regulator load */
944 err = rdev->desc->ops->set_load(rdev, current_uA);
946 rdev_err(rdev, "failed to set load %d\n", current_uA);
948 /* get output voltage */
949 output_uV = _regulator_get_voltage(rdev);
950 if (output_uV <= 0) {
951 rdev_err(rdev, "invalid output voltage found\n");
955 /* get input voltage */
958 input_uV = regulator_get_voltage(rdev->supply);
960 input_uV = rdev->constraints->input_uV;
962 rdev_err(rdev, "invalid input voltage found\n");
966 /* now get the optimum mode for our new total regulator load */
967 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
968 output_uV, current_uA);
970 /* check the new mode is allowed */
971 err = regulator_mode_constrain(rdev, &mode);
973 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
974 current_uA, input_uV, output_uV);
978 err = rdev->desc->ops->set_mode(rdev, mode);
980 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
986 static int suspend_set_state(struct regulator_dev *rdev,
987 suspend_state_t state)
990 struct regulator_state *rstate;
992 rstate = regulator_get_suspend_state(rdev, state);
996 /* If we have no suspend mode configuration don't set anything;
997 * only warn if the driver implements set_suspend_voltage or
998 * set_suspend_mode callback.
1000 if (rstate->enabled != ENABLE_IN_SUSPEND &&
1001 rstate->enabled != DISABLE_IN_SUSPEND) {
1002 if (rdev->desc->ops->set_suspend_voltage ||
1003 rdev->desc->ops->set_suspend_mode)
1004 rdev_warn(rdev, "No configuration\n");
1008 if (rstate->enabled == ENABLE_IN_SUSPEND &&
1009 rdev->desc->ops->set_suspend_enable)
1010 ret = rdev->desc->ops->set_suspend_enable(rdev);
1011 else if (rstate->enabled == DISABLE_IN_SUSPEND &&
1012 rdev->desc->ops->set_suspend_disable)
1013 ret = rdev->desc->ops->set_suspend_disable(rdev);
1014 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
1018 rdev_err(rdev, "failed to enabled/disable\n");
1022 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
1023 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
1025 rdev_err(rdev, "failed to set voltage\n");
1030 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
1031 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
1033 rdev_err(rdev, "failed to set mode\n");
1041 static void print_constraints(struct regulator_dev *rdev)
1043 struct regulation_constraints *constraints = rdev->constraints;
1045 size_t len = sizeof(buf) - 1;
1049 if (constraints->min_uV && constraints->max_uV) {
1050 if (constraints->min_uV == constraints->max_uV)
1051 count += scnprintf(buf + count, len - count, "%d mV ",
1052 constraints->min_uV / 1000);
1054 count += scnprintf(buf + count, len - count,
1056 constraints->min_uV / 1000,
1057 constraints->max_uV / 1000);
1060 if (!constraints->min_uV ||
1061 constraints->min_uV != constraints->max_uV) {
1062 ret = _regulator_get_voltage(rdev);
1064 count += scnprintf(buf + count, len - count,
1065 "at %d mV ", ret / 1000);
1068 if (constraints->uV_offset)
1069 count += scnprintf(buf + count, len - count, "%dmV offset ",
1070 constraints->uV_offset / 1000);
1072 if (constraints->min_uA && constraints->max_uA) {
1073 if (constraints->min_uA == constraints->max_uA)
1074 count += scnprintf(buf + count, len - count, "%d mA ",
1075 constraints->min_uA / 1000);
1077 count += scnprintf(buf + count, len - count,
1079 constraints->min_uA / 1000,
1080 constraints->max_uA / 1000);
1083 if (!constraints->min_uA ||
1084 constraints->min_uA != constraints->max_uA) {
1085 ret = _regulator_get_current_limit(rdev);
1087 count += scnprintf(buf + count, len - count,
1088 "at %d mA ", ret / 1000);
1091 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
1092 count += scnprintf(buf + count, len - count, "fast ");
1093 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
1094 count += scnprintf(buf + count, len - count, "normal ");
1095 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
1096 count += scnprintf(buf + count, len - count, "idle ");
1097 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
1098 count += scnprintf(buf + count, len - count, "standby");
1101 scnprintf(buf, len, "no parameters");
1103 rdev_dbg(rdev, "%s\n", buf);
1105 if ((constraints->min_uV != constraints->max_uV) &&
1106 !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE))
1108 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
1111 static int machine_constraints_voltage(struct regulator_dev *rdev,
1112 struct regulation_constraints *constraints)
1114 const struct regulator_ops *ops = rdev->desc->ops;
1117 /* do we need to apply the constraint voltage */
1118 if (rdev->constraints->apply_uV &&
1119 rdev->constraints->min_uV && rdev->constraints->max_uV) {
1120 int target_min, target_max;
1121 int current_uV = _regulator_get_voltage(rdev);
1123 if (current_uV == -ENOTRECOVERABLE) {
1124 /* This regulator can't be read and must be initialized */
1125 rdev_info(rdev, "Setting %d-%duV\n",
1126 rdev->constraints->min_uV,
1127 rdev->constraints->max_uV);
1128 _regulator_do_set_voltage(rdev,
1129 rdev->constraints->min_uV,
1130 rdev->constraints->max_uV);
1131 current_uV = _regulator_get_voltage(rdev);
1134 if (current_uV < 0) {
1136 "failed to get the current voltage(%d)\n",
1142 * If we're below the minimum voltage move up to the
1143 * minimum voltage, if we're above the maximum voltage
1144 * then move down to the maximum.
1146 target_min = current_uV;
1147 target_max = current_uV;
1149 if (current_uV < rdev->constraints->min_uV) {
1150 target_min = rdev->constraints->min_uV;
1151 target_max = rdev->constraints->min_uV;
1154 if (current_uV > rdev->constraints->max_uV) {
1155 target_min = rdev->constraints->max_uV;
1156 target_max = rdev->constraints->max_uV;
1159 if (target_min != current_uV || target_max != current_uV) {
1160 rdev_info(rdev, "Bringing %duV into %d-%duV\n",
1161 current_uV, target_min, target_max);
1162 ret = _regulator_do_set_voltage(
1163 rdev, target_min, target_max);
1166 "failed to apply %d-%duV constraint(%d)\n",
1167 target_min, target_max, ret);
1173 /* constrain machine-level voltage specs to fit
1174 * the actual range supported by this regulator.
1176 if (ops->list_voltage && rdev->desc->n_voltages) {
1177 int count = rdev->desc->n_voltages;
1179 int min_uV = INT_MAX;
1180 int max_uV = INT_MIN;
1181 int cmin = constraints->min_uV;
1182 int cmax = constraints->max_uV;
1184 /* it's safe to autoconfigure fixed-voltage supplies
1185 and the constraints are used by list_voltage. */
1186 if (count == 1 && !cmin) {
1189 constraints->min_uV = cmin;
1190 constraints->max_uV = cmax;
1193 /* voltage constraints are optional */
1194 if ((cmin == 0) && (cmax == 0))
1197 /* else require explicit machine-level constraints */
1198 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
1199 rdev_err(rdev, "invalid voltage constraints\n");
1203 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
1204 for (i = 0; i < count; i++) {
1207 value = ops->list_voltage(rdev, i);
1211 /* maybe adjust [min_uV..max_uV] */
1212 if (value >= cmin && value < min_uV)
1214 if (value <= cmax && value > max_uV)
1218 /* final: [min_uV..max_uV] valid iff constraints valid */
1219 if (max_uV < min_uV) {
1221 "unsupportable voltage constraints %u-%uuV\n",
1226 /* use regulator's subset of machine constraints */
1227 if (constraints->min_uV < min_uV) {
1228 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
1229 constraints->min_uV, min_uV);
1230 constraints->min_uV = min_uV;
1232 if (constraints->max_uV > max_uV) {
1233 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
1234 constraints->max_uV, max_uV);
1235 constraints->max_uV = max_uV;
1242 static int machine_constraints_current(struct regulator_dev *rdev,
1243 struct regulation_constraints *constraints)
1245 const struct regulator_ops *ops = rdev->desc->ops;
1248 if (!constraints->min_uA && !constraints->max_uA)
1251 if (constraints->min_uA > constraints->max_uA) {
1252 rdev_err(rdev, "Invalid current constraints\n");
1256 if (!ops->set_current_limit || !ops->get_current_limit) {
1257 rdev_warn(rdev, "Operation of current configuration missing\n");
1261 /* Set regulator current in constraints range */
1262 ret = ops->set_current_limit(rdev, constraints->min_uA,
1263 constraints->max_uA);
1265 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1272 static int _regulator_do_enable(struct regulator_dev *rdev);
1275 * set_machine_constraints - sets regulator constraints
1276 * @rdev: regulator source
1277 * @constraints: constraints to apply
1279 * Allows platform initialisation code to define and constrain
1280 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1281 * Constraints *must* be set by platform code in order for some
1282 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1285 static int set_machine_constraints(struct regulator_dev *rdev,
1286 const struct regulation_constraints *constraints)
1289 const struct regulator_ops *ops = rdev->desc->ops;
1292 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1295 rdev->constraints = kzalloc(sizeof(*constraints),
1297 if (!rdev->constraints)
1300 ret = machine_constraints_voltage(rdev, rdev->constraints);
1304 ret = machine_constraints_current(rdev, rdev->constraints);
1308 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1309 ret = ops->set_input_current_limit(rdev,
1310 rdev->constraints->ilim_uA);
1312 rdev_err(rdev, "failed to set input limit\n");
1317 /* do we need to setup our suspend state */
1318 if (rdev->constraints->initial_state) {
1319 ret = suspend_set_state(rdev, rdev->constraints->initial_state);
1321 rdev_err(rdev, "failed to set suspend state\n");
1326 if (rdev->constraints->initial_mode) {
1327 if (!ops->set_mode) {
1328 rdev_err(rdev, "no set_mode operation\n");
1332 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1334 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1337 } else if (rdev->constraints->system_load) {
1339 * We'll only apply the initial system load if an
1340 * initial mode wasn't specified.
1342 regulator_lock(rdev);
1343 drms_uA_update(rdev);
1344 regulator_unlock(rdev);
1347 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1348 && ops->set_ramp_delay) {
1349 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1351 rdev_err(rdev, "failed to set ramp_delay\n");
1356 if (rdev->constraints->pull_down && ops->set_pull_down) {
1357 ret = ops->set_pull_down(rdev);
1359 rdev_err(rdev, "failed to set pull down\n");
1364 if (rdev->constraints->soft_start && ops->set_soft_start) {
1365 ret = ops->set_soft_start(rdev);
1367 rdev_err(rdev, "failed to set soft start\n");
1372 if (rdev->constraints->over_current_protection
1373 && ops->set_over_current_protection) {
1374 ret = ops->set_over_current_protection(rdev);
1376 rdev_err(rdev, "failed to set over current protection\n");
1381 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1382 bool ad_state = (rdev->constraints->active_discharge ==
1383 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1385 ret = ops->set_active_discharge(rdev, ad_state);
1387 rdev_err(rdev, "failed to set active discharge\n");
1392 /* If the constraints say the regulator should be on at this point
1393 * and we have control then make sure it is enabled.
1395 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1397 ret = regulator_enable(rdev->supply);
1399 _regulator_put(rdev->supply);
1400 rdev->supply = NULL;
1405 ret = _regulator_do_enable(rdev);
1406 if (ret < 0 && ret != -EINVAL) {
1407 rdev_err(rdev, "failed to enable\n");
1413 print_constraints(rdev);
1418 * set_supply - set regulator supply regulator
1419 * @rdev: regulator name
1420 * @supply_rdev: supply regulator name
1422 * Called by platform initialisation code to set the supply regulator for this
1423 * regulator. This ensures that a regulators supply will also be enabled by the
1424 * core if it's child is enabled.
1426 static int set_supply(struct regulator_dev *rdev,
1427 struct regulator_dev *supply_rdev)
1431 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1433 if (!try_module_get(supply_rdev->owner))
1436 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1437 if (rdev->supply == NULL) {
1441 supply_rdev->open_count++;
1447 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1448 * @rdev: regulator source
1449 * @consumer_dev_name: dev_name() string for device supply applies to
1450 * @supply: symbolic name for supply
1452 * Allows platform initialisation code to map physical regulator
1453 * sources to symbolic names for supplies for use by devices. Devices
1454 * should use these symbolic names to request regulators, avoiding the
1455 * need to provide board-specific regulator names as platform data.
1457 static int set_consumer_device_supply(struct regulator_dev *rdev,
1458 const char *consumer_dev_name,
1461 struct regulator_map *node;
1467 if (consumer_dev_name != NULL)
1472 list_for_each_entry(node, ®ulator_map_list, list) {
1473 if (node->dev_name && consumer_dev_name) {
1474 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1476 } else if (node->dev_name || consumer_dev_name) {
1480 if (strcmp(node->supply, supply) != 0)
1483 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1485 dev_name(&node->regulator->dev),
1486 node->regulator->desc->name,
1488 dev_name(&rdev->dev), rdev_get_name(rdev));
1492 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1496 node->regulator = rdev;
1497 node->supply = supply;
1500 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1501 if (node->dev_name == NULL) {
1507 list_add(&node->list, ®ulator_map_list);
1511 static void unset_regulator_supplies(struct regulator_dev *rdev)
1513 struct regulator_map *node, *n;
1515 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1516 if (rdev == node->regulator) {
1517 list_del(&node->list);
1518 kfree(node->dev_name);
1524 #ifdef CONFIG_DEBUG_FS
1525 static ssize_t constraint_flags_read_file(struct file *file,
1526 char __user *user_buf,
1527 size_t count, loff_t *ppos)
1529 const struct regulator *regulator = file->private_data;
1530 const struct regulation_constraints *c = regulator->rdev->constraints;
1537 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1541 ret = snprintf(buf, PAGE_SIZE,
1545 "ramp_disable: %u\n"
1548 "over_current_protection: %u\n",
1555 c->over_current_protection);
1557 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1565 static const struct file_operations constraint_flags_fops = {
1566 #ifdef CONFIG_DEBUG_FS
1567 .open = simple_open,
1568 .read = constraint_flags_read_file,
1569 .llseek = default_llseek,
1573 #define REG_STR_SIZE 64
1575 static struct regulator *create_regulator(struct regulator_dev *rdev,
1577 const char *supply_name)
1579 struct regulator *regulator;
1580 char buf[REG_STR_SIZE];
1583 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1584 if (regulator == NULL)
1587 regulator_lock(rdev);
1588 regulator->rdev = rdev;
1589 list_add(®ulator->list, &rdev->consumer_list);
1592 regulator->dev = dev;
1594 /* Add a link to the device sysfs entry */
1595 size = snprintf(buf, REG_STR_SIZE, "%s-%s",
1596 dev->kobj.name, supply_name);
1597 if (size >= REG_STR_SIZE)
1600 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1601 if (regulator->supply_name == NULL)
1604 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1607 rdev_dbg(rdev, "could not add device link %s err %d\n",
1608 dev->kobj.name, err);
1612 regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL);
1613 if (regulator->supply_name == NULL)
1617 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1619 if (!regulator->debugfs) {
1620 rdev_dbg(rdev, "Failed to create debugfs directory\n");
1622 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1623 ®ulator->uA_load);
1624 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1625 ®ulator->voltage[PM_SUSPEND_ON].min_uV);
1626 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1627 ®ulator->voltage[PM_SUSPEND_ON].max_uV);
1628 debugfs_create_file("constraint_flags", 0444,
1629 regulator->debugfs, regulator,
1630 &constraint_flags_fops);
1634 * Check now if the regulator is an always on regulator - if
1635 * it is then we don't need to do nearly so much work for
1636 * enable/disable calls.
1638 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) &&
1639 _regulator_is_enabled(rdev))
1640 regulator->always_on = true;
1642 regulator_unlock(rdev);
1645 list_del(®ulator->list);
1647 regulator_unlock(rdev);
1651 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1653 if (rdev->constraints && rdev->constraints->enable_time)
1654 return rdev->constraints->enable_time;
1655 if (!rdev->desc->ops->enable_time)
1656 return rdev->desc->enable_time;
1657 return rdev->desc->ops->enable_time(rdev);
1660 static struct regulator_supply_alias *regulator_find_supply_alias(
1661 struct device *dev, const char *supply)
1663 struct regulator_supply_alias *map;
1665 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1666 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1672 static void regulator_supply_alias(struct device **dev, const char **supply)
1674 struct regulator_supply_alias *map;
1676 map = regulator_find_supply_alias(*dev, *supply);
1678 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1679 *supply, map->alias_supply,
1680 dev_name(map->alias_dev));
1681 *dev = map->alias_dev;
1682 *supply = map->alias_supply;
1686 static int regulator_match(struct device *dev, const void *data)
1688 struct regulator_dev *r = dev_to_rdev(dev);
1690 return strcmp(rdev_get_name(r), data) == 0;
1693 static struct regulator_dev *regulator_lookup_by_name(const char *name)
1697 dev = class_find_device(®ulator_class, NULL, name, regulator_match);
1699 return dev ? dev_to_rdev(dev) : NULL;
1703 * regulator_dev_lookup - lookup a regulator device.
1704 * @dev: device for regulator "consumer".
1705 * @supply: Supply name or regulator ID.
1707 * If successful, returns a struct regulator_dev that corresponds to the name
1708 * @supply and with the embedded struct device refcount incremented by one.
1709 * The refcount must be dropped by calling put_device().
1710 * On failure one of the following ERR-PTR-encoded values is returned:
1711 * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
1714 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1717 struct regulator_dev *r = NULL;
1718 struct device_node *node;
1719 struct regulator_map *map;
1720 const char *devname = NULL;
1722 regulator_supply_alias(&dev, &supply);
1724 /* first do a dt based lookup */
1725 if (dev && dev->of_node) {
1726 node = of_get_regulator(dev, supply);
1728 r = of_find_regulator_by_node(node);
1733 * We have a node, but there is no device.
1734 * assume it has not registered yet.
1736 return ERR_PTR(-EPROBE_DEFER);
1740 /* if not found, try doing it non-dt way */
1742 devname = dev_name(dev);
1744 mutex_lock(®ulator_list_mutex);
1745 list_for_each_entry(map, ®ulator_map_list, list) {
1746 /* If the mapping has a device set up it must match */
1747 if (map->dev_name &&
1748 (!devname || strcmp(map->dev_name, devname)))
1751 if (strcmp(map->supply, supply) == 0 &&
1752 get_device(&map->regulator->dev)) {
1757 mutex_unlock(®ulator_list_mutex);
1762 r = regulator_lookup_by_name(supply);
1766 return ERR_PTR(-ENODEV);
1769 static int regulator_resolve_supply(struct regulator_dev *rdev)
1771 struct regulator_dev *r;
1772 struct device *dev = rdev->dev.parent;
1775 /* No supply to resolve? */
1776 if (!rdev->supply_name)
1779 /* Supply already resolved? */
1783 r = regulator_dev_lookup(dev, rdev->supply_name);
1787 /* Did the lookup explicitly defer for us? */
1788 if (ret == -EPROBE_DEFER)
1791 if (have_full_constraints()) {
1792 r = dummy_regulator_rdev;
1793 get_device(&r->dev);
1795 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1796 rdev->supply_name, rdev->desc->name);
1797 return -EPROBE_DEFER;
1802 * If the supply's parent device is not the same as the
1803 * regulator's parent device, then ensure the parent device
1804 * is bound before we resolve the supply, in case the parent
1805 * device get probe deferred and unregisters the supply.
1807 if (r->dev.parent && r->dev.parent != rdev->dev.parent) {
1808 if (!device_is_bound(r->dev.parent)) {
1809 put_device(&r->dev);
1810 return -EPROBE_DEFER;
1814 /* Recursively resolve the supply of the supply */
1815 ret = regulator_resolve_supply(r);
1817 put_device(&r->dev);
1821 ret = set_supply(rdev, r);
1823 put_device(&r->dev);
1828 * In set_machine_constraints() we may have turned this regulator on
1829 * but we couldn't propagate to the supply if it hadn't been resolved
1832 if (rdev->use_count) {
1833 ret = regulator_enable(rdev->supply);
1835 _regulator_put(rdev->supply);
1836 rdev->supply = NULL;
1844 /* Internal regulator request function */
1845 struct regulator *_regulator_get(struct device *dev, const char *id,
1846 enum regulator_get_type get_type)
1848 struct regulator_dev *rdev;
1849 struct regulator *regulator;
1850 const char *devname = dev ? dev_name(dev) : "deviceless";
1853 if (get_type >= MAX_GET_TYPE) {
1854 dev_err(dev, "invalid type %d in %s\n", get_type, __func__);
1855 return ERR_PTR(-EINVAL);
1859 pr_err("get() with no identifier\n");
1860 return ERR_PTR(-EINVAL);
1863 rdev = regulator_dev_lookup(dev, id);
1865 ret = PTR_ERR(rdev);
1868 * If regulator_dev_lookup() fails with error other
1869 * than -ENODEV our job here is done, we simply return it.
1872 return ERR_PTR(ret);
1874 if (!have_full_constraints()) {
1876 "incomplete constraints, dummy supplies not allowed\n");
1877 return ERR_PTR(-ENODEV);
1883 * Assume that a regulator is physically present and
1884 * enabled, even if it isn't hooked up, and just
1888 "%s supply %s not found, using dummy regulator\n",
1890 rdev = dummy_regulator_rdev;
1891 get_device(&rdev->dev);
1896 "dummy supplies not allowed for exclusive requests\n");
1900 return ERR_PTR(-ENODEV);
1904 if (rdev->exclusive) {
1905 regulator = ERR_PTR(-EPERM);
1906 put_device(&rdev->dev);
1910 if (get_type == EXCLUSIVE_GET && rdev->open_count) {
1911 regulator = ERR_PTR(-EBUSY);
1912 put_device(&rdev->dev);
1916 mutex_lock(®ulator_list_mutex);
1917 ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled);
1918 mutex_unlock(®ulator_list_mutex);
1921 regulator = ERR_PTR(-EPROBE_DEFER);
1922 put_device(&rdev->dev);
1926 ret = regulator_resolve_supply(rdev);
1928 regulator = ERR_PTR(ret);
1929 put_device(&rdev->dev);
1933 if (!try_module_get(rdev->owner)) {
1934 regulator = ERR_PTR(-EPROBE_DEFER);
1935 put_device(&rdev->dev);
1939 regulator = create_regulator(rdev, dev, id);
1940 if (regulator == NULL) {
1941 regulator = ERR_PTR(-ENOMEM);
1942 put_device(&rdev->dev);
1943 module_put(rdev->owner);
1948 if (get_type == EXCLUSIVE_GET) {
1949 rdev->exclusive = 1;
1951 ret = _regulator_is_enabled(rdev);
1953 rdev->use_count = 1;
1955 rdev->use_count = 0;
1958 device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS);
1964 * regulator_get - lookup and obtain a reference to a regulator.
1965 * @dev: device for regulator "consumer"
1966 * @id: Supply name or regulator ID.
1968 * Returns a struct regulator corresponding to the regulator producer,
1969 * or IS_ERR() condition containing errno.
1971 * Use of supply names configured via regulator_set_device_supply() is
1972 * strongly encouraged. It is recommended that the supply name used
1973 * should match the name used for the supply and/or the relevant
1974 * device pins in the datasheet.
1976 struct regulator *regulator_get(struct device *dev, const char *id)
1978 return _regulator_get(dev, id, NORMAL_GET);
1980 EXPORT_SYMBOL_GPL(regulator_get);
1983 * regulator_get_exclusive - obtain exclusive access to a regulator.
1984 * @dev: device for regulator "consumer"
1985 * @id: Supply name or regulator ID.
1987 * Returns a struct regulator corresponding to the regulator producer,
1988 * or IS_ERR() condition containing errno. Other consumers will be
1989 * unable to obtain this regulator while this reference is held and the
1990 * use count for the regulator will be initialised to reflect the current
1991 * state of the regulator.
1993 * This is intended for use by consumers which cannot tolerate shared
1994 * use of the regulator such as those which need to force the
1995 * regulator off for correct operation of the hardware they are
1998 * Use of supply names configured via regulator_set_device_supply() is
1999 * strongly encouraged. It is recommended that the supply name used
2000 * should match the name used for the supply and/or the relevant
2001 * device pins in the datasheet.
2003 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
2005 return _regulator_get(dev, id, EXCLUSIVE_GET);
2007 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
2010 * regulator_get_optional - obtain optional access to a regulator.
2011 * @dev: device for regulator "consumer"
2012 * @id: Supply name or regulator ID.
2014 * Returns a struct regulator corresponding to the regulator producer,
2015 * or IS_ERR() condition containing errno.
2017 * This is intended for use by consumers for devices which can have
2018 * some supplies unconnected in normal use, such as some MMC devices.
2019 * It can allow the regulator core to provide stub supplies for other
2020 * supplies requested using normal regulator_get() calls without
2021 * disrupting the operation of drivers that can handle absent
2024 * Use of supply names configured via regulator_set_device_supply() is
2025 * strongly encouraged. It is recommended that the supply name used
2026 * should match the name used for the supply and/or the relevant
2027 * device pins in the datasheet.
2029 struct regulator *regulator_get_optional(struct device *dev, const char *id)
2031 return _regulator_get(dev, id, OPTIONAL_GET);
2033 EXPORT_SYMBOL_GPL(regulator_get_optional);
2035 /* regulator_list_mutex lock held by regulator_put() */
2036 static void _regulator_put(struct regulator *regulator)
2038 struct regulator_dev *rdev;
2040 if (IS_ERR_OR_NULL(regulator))
2043 lockdep_assert_held_once(®ulator_list_mutex);
2045 /* Docs say you must disable before calling regulator_put() */
2046 WARN_ON(regulator->enable_count);
2048 rdev = regulator->rdev;
2050 debugfs_remove_recursive(regulator->debugfs);
2052 if (regulator->dev) {
2053 device_link_remove(regulator->dev, &rdev->dev);
2055 /* remove any sysfs entries */
2056 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
2059 regulator_lock(rdev);
2060 list_del(®ulator->list);
2063 rdev->exclusive = 0;
2064 put_device(&rdev->dev);
2065 regulator_unlock(rdev);
2067 kfree_const(regulator->supply_name);
2070 module_put(rdev->owner);
2074 * regulator_put - "free" the regulator source
2075 * @regulator: regulator source
2077 * Note: drivers must ensure that all regulator_enable calls made on this
2078 * regulator source are balanced by regulator_disable calls prior to calling
2081 void regulator_put(struct regulator *regulator)
2083 mutex_lock(®ulator_list_mutex);
2084 _regulator_put(regulator);
2085 mutex_unlock(®ulator_list_mutex);
2087 EXPORT_SYMBOL_GPL(regulator_put);
2090 * regulator_register_supply_alias - Provide device alias for supply lookup
2092 * @dev: device that will be given as the regulator "consumer"
2093 * @id: Supply name or regulator ID
2094 * @alias_dev: device that should be used to lookup the supply
2095 * @alias_id: Supply name or regulator ID that should be used to lookup the
2098 * All lookups for id on dev will instead be conducted for alias_id on
2101 int regulator_register_supply_alias(struct device *dev, const char *id,
2102 struct device *alias_dev,
2103 const char *alias_id)
2105 struct regulator_supply_alias *map;
2107 map = regulator_find_supply_alias(dev, id);
2111 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
2116 map->src_supply = id;
2117 map->alias_dev = alias_dev;
2118 map->alias_supply = alias_id;
2120 list_add(&map->list, ®ulator_supply_alias_list);
2122 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
2123 id, dev_name(dev), alias_id, dev_name(alias_dev));
2127 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
2130 * regulator_unregister_supply_alias - Remove device alias
2132 * @dev: device that will be given as the regulator "consumer"
2133 * @id: Supply name or regulator ID
2135 * Remove a lookup alias if one exists for id on dev.
2137 void regulator_unregister_supply_alias(struct device *dev, const char *id)
2139 struct regulator_supply_alias *map;
2141 map = regulator_find_supply_alias(dev, id);
2143 list_del(&map->list);
2147 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
2150 * regulator_bulk_register_supply_alias - register multiple aliases
2152 * @dev: device that will be given as the regulator "consumer"
2153 * @id: List of supply names or regulator IDs
2154 * @alias_dev: device that should be used to lookup the supply
2155 * @alias_id: List of supply names or regulator IDs that should be used to
2157 * @num_id: Number of aliases to register
2159 * @return 0 on success, an errno on failure.
2161 * This helper function allows drivers to register several supply
2162 * aliases in one operation. If any of the aliases cannot be
2163 * registered any aliases that were registered will be removed
2164 * before returning to the caller.
2166 int regulator_bulk_register_supply_alias(struct device *dev,
2167 const char *const *id,
2168 struct device *alias_dev,
2169 const char *const *alias_id,
2175 for (i = 0; i < num_id; ++i) {
2176 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
2186 "Failed to create supply alias %s,%s -> %s,%s\n",
2187 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
2190 regulator_unregister_supply_alias(dev, id[i]);
2194 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
2197 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
2199 * @dev: device that will be given as the regulator "consumer"
2200 * @id: List of supply names or regulator IDs
2201 * @num_id: Number of aliases to unregister
2203 * This helper function allows drivers to unregister several supply
2204 * aliases in one operation.
2206 void regulator_bulk_unregister_supply_alias(struct device *dev,
2207 const char *const *id,
2212 for (i = 0; i < num_id; ++i)
2213 regulator_unregister_supply_alias(dev, id[i]);
2215 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
2218 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
2219 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
2220 const struct regulator_config *config)
2222 struct regulator_enable_gpio *pin;
2223 struct gpio_desc *gpiod;
2225 gpiod = config->ena_gpiod;
2227 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
2228 if (pin->gpiod == gpiod) {
2229 rdev_dbg(rdev, "GPIO is already used\n");
2230 goto update_ena_gpio_to_rdev;
2234 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
2239 list_add(&pin->list, ®ulator_ena_gpio_list);
2241 update_ena_gpio_to_rdev:
2242 pin->request_count++;
2243 rdev->ena_pin = pin;
2247 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
2249 struct regulator_enable_gpio *pin, *n;
2254 /* Free the GPIO only in case of no use */
2255 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
2256 if (pin->gpiod == rdev->ena_pin->gpiod) {
2257 if (pin->request_count <= 1) {
2258 pin->request_count = 0;
2259 list_del(&pin->list);
2261 rdev->ena_pin = NULL;
2264 pin->request_count--;
2271 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
2272 * @rdev: regulator_dev structure
2273 * @enable: enable GPIO at initial use?
2275 * GPIO is enabled in case of initial use. (enable_count is 0)
2276 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2278 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
2280 struct regulator_enable_gpio *pin = rdev->ena_pin;
2286 /* Enable GPIO at initial use */
2287 if (pin->enable_count == 0)
2288 gpiod_set_value_cansleep(pin->gpiod, 1);
2290 pin->enable_count++;
2292 if (pin->enable_count > 1) {
2293 pin->enable_count--;
2297 /* Disable GPIO if not used */
2298 if (pin->enable_count <= 1) {
2299 gpiod_set_value_cansleep(pin->gpiod, 0);
2300 pin->enable_count = 0;
2308 * _regulator_enable_delay - a delay helper function
2309 * @delay: time to delay in microseconds
2311 * Delay for the requested amount of time as per the guidelines in:
2313 * Documentation/timers/timers-howto.txt
2315 * The assumption here is that regulators will never be enabled in
2316 * atomic context and therefore sleeping functions can be used.
2318 static void _regulator_enable_delay(unsigned int delay)
2320 unsigned int ms = delay / 1000;
2321 unsigned int us = delay % 1000;
2325 * For small enough values, handle super-millisecond
2326 * delays in the usleep_range() call below.
2335 * Give the scheduler some room to coalesce with any other
2336 * wakeup sources. For delays shorter than 10 us, don't even
2337 * bother setting up high-resolution timers and just busy-
2341 usleep_range(us, us + 100);
2346 static int _regulator_do_enable(struct regulator_dev *rdev)
2350 /* Query before enabling in case configuration dependent. */
2351 ret = _regulator_get_enable_time(rdev);
2355 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2359 trace_regulator_enable(rdev_get_name(rdev));
2361 if (rdev->desc->off_on_delay) {
2362 /* if needed, keep a distance of off_on_delay from last time
2363 * this regulator was disabled.
2365 unsigned long start_jiffy = jiffies;
2366 unsigned long intended, max_delay, remaining;
2368 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2369 intended = rdev->last_off_jiffy + max_delay;
2371 if (time_before(start_jiffy, intended)) {
2372 /* calc remaining jiffies to deal with one-time
2374 * in case of multiple timer wrapping, either it can be
2375 * detected by out-of-range remaining, or it cannot be
2376 * detected and we get a penalty of
2377 * _regulator_enable_delay().
2379 remaining = intended - start_jiffy;
2380 if (remaining <= max_delay)
2381 _regulator_enable_delay(
2382 jiffies_to_usecs(remaining));
2386 if (rdev->ena_pin) {
2387 if (!rdev->ena_gpio_state) {
2388 ret = regulator_ena_gpio_ctrl(rdev, true);
2391 rdev->ena_gpio_state = 1;
2393 } else if (rdev->desc->ops->enable) {
2394 ret = rdev->desc->ops->enable(rdev);
2401 /* Allow the regulator to ramp; it would be useful to extend
2402 * this for bulk operations so that the regulators can ramp
2404 trace_regulator_enable_delay(rdev_get_name(rdev));
2406 _regulator_enable_delay(delay);
2408 trace_regulator_enable_complete(rdev_get_name(rdev));
2414 * _regulator_handle_consumer_enable - handle that a consumer enabled
2415 * @regulator: regulator source
2417 * Some things on a regulator consumer (like the contribution towards total
2418 * load on the regulator) only have an effect when the consumer wants the
2419 * regulator enabled. Explained in example with two consumers of the same
2421 * consumer A: set_load(100); => total load = 0
2422 * consumer A: regulator_enable(); => total load = 100
2423 * consumer B: set_load(1000); => total load = 100
2424 * consumer B: regulator_enable(); => total load = 1100
2425 * consumer A: regulator_disable(); => total_load = 1000
2427 * This function (together with _regulator_handle_consumer_disable) is
2428 * responsible for keeping track of the refcount for a given regulator consumer
2429 * and applying / unapplying these things.
2431 * Returns 0 upon no error; -error upon error.
2433 static int _regulator_handle_consumer_enable(struct regulator *regulator)
2435 struct regulator_dev *rdev = regulator->rdev;
2437 lockdep_assert_held_once(&rdev->mutex.base);
2439 regulator->enable_count++;
2440 if (regulator->uA_load && regulator->enable_count == 1)
2441 return drms_uA_update(rdev);
2447 * _regulator_handle_consumer_disable - handle that a consumer disabled
2448 * @regulator: regulator source
2450 * The opposite of _regulator_handle_consumer_enable().
2452 * Returns 0 upon no error; -error upon error.
2454 static int _regulator_handle_consumer_disable(struct regulator *regulator)
2456 struct regulator_dev *rdev = regulator->rdev;
2458 lockdep_assert_held_once(&rdev->mutex.base);
2460 if (!regulator->enable_count) {
2461 rdev_err(rdev, "Underflow of regulator enable count\n");
2465 regulator->enable_count--;
2466 if (regulator->uA_load && regulator->enable_count == 0)
2467 return drms_uA_update(rdev);
2472 /* locks held by regulator_enable() */
2473 static int _regulator_enable(struct regulator *regulator)
2475 struct regulator_dev *rdev = regulator->rdev;
2478 lockdep_assert_held_once(&rdev->mutex.base);
2480 if (rdev->use_count == 0 && rdev->supply) {
2481 ret = _regulator_enable(rdev->supply);
2486 /* balance only if there are regulators coupled */
2487 if (rdev->coupling_desc.n_coupled > 1) {
2488 ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
2490 goto err_disable_supply;
2493 ret = _regulator_handle_consumer_enable(regulator);
2495 goto err_disable_supply;
2497 if (rdev->use_count == 0) {
2498 /* The regulator may on if it's not switchable or left on */
2499 ret = _regulator_is_enabled(rdev);
2500 if (ret == -EINVAL || ret == 0) {
2501 if (!regulator_ops_is_valid(rdev,
2502 REGULATOR_CHANGE_STATUS)) {
2504 goto err_consumer_disable;
2507 ret = _regulator_do_enable(rdev);
2509 goto err_consumer_disable;
2511 _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE,
2513 } else if (ret < 0) {
2514 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
2515 goto err_consumer_disable;
2517 /* Fallthrough on positive return values - already enabled */
2524 err_consumer_disable:
2525 _regulator_handle_consumer_disable(regulator);
2528 if (rdev->use_count == 0 && rdev->supply)
2529 _regulator_disable(rdev->supply);
2535 * regulator_enable - enable regulator output
2536 * @regulator: regulator source
2538 * Request that the regulator be enabled with the regulator output at
2539 * the predefined voltage or current value. Calls to regulator_enable()
2540 * must be balanced with calls to regulator_disable().
2542 * NOTE: the output value can be set by other drivers, boot loader or may be
2543 * hardwired in the regulator.
2545 int regulator_enable(struct regulator *regulator)
2547 struct regulator_dev *rdev = regulator->rdev;
2548 struct ww_acquire_ctx ww_ctx;
2551 regulator_lock_dependent(rdev, &ww_ctx);
2552 ret = _regulator_enable(regulator);
2553 regulator_unlock_dependent(rdev, &ww_ctx);
2557 EXPORT_SYMBOL_GPL(regulator_enable);
2559 static int _regulator_do_disable(struct regulator_dev *rdev)
2563 trace_regulator_disable(rdev_get_name(rdev));
2565 if (rdev->ena_pin) {
2566 if (rdev->ena_gpio_state) {
2567 ret = regulator_ena_gpio_ctrl(rdev, false);
2570 rdev->ena_gpio_state = 0;
2573 } else if (rdev->desc->ops->disable) {
2574 ret = rdev->desc->ops->disable(rdev);
2579 /* cares about last_off_jiffy only if off_on_delay is required by
2582 if (rdev->desc->off_on_delay)
2583 rdev->last_off_jiffy = jiffies;
2585 trace_regulator_disable_complete(rdev_get_name(rdev));
2590 /* locks held by regulator_disable() */
2591 static int _regulator_disable(struct regulator *regulator)
2593 struct regulator_dev *rdev = regulator->rdev;
2596 lockdep_assert_held_once(&rdev->mutex.base);
2598 if (WARN(rdev->use_count <= 0,
2599 "unbalanced disables for %s\n", rdev_get_name(rdev)))
2602 /* are we the last user and permitted to disable ? */
2603 if (rdev->use_count == 1 &&
2604 (rdev->constraints && !rdev->constraints->always_on)) {
2606 /* we are last user */
2607 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
2608 ret = _notifier_call_chain(rdev,
2609 REGULATOR_EVENT_PRE_DISABLE,
2611 if (ret & NOTIFY_STOP_MASK)
2614 ret = _regulator_do_disable(rdev);
2616 rdev_err(rdev, "failed to disable\n");
2617 _notifier_call_chain(rdev,
2618 REGULATOR_EVENT_ABORT_DISABLE,
2622 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2626 rdev->use_count = 0;
2627 } else if (rdev->use_count > 1) {
2632 ret = _regulator_handle_consumer_disable(regulator);
2634 if (ret == 0 && rdev->coupling_desc.n_coupled > 1)
2635 ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
2637 if (ret == 0 && rdev->use_count == 0 && rdev->supply)
2638 ret = _regulator_disable(rdev->supply);
2644 * regulator_disable - disable regulator output
2645 * @regulator: regulator source
2647 * Disable the regulator output voltage or current. Calls to
2648 * regulator_enable() must be balanced with calls to
2649 * regulator_disable().
2651 * NOTE: this will only disable the regulator output if no other consumer
2652 * devices have it enabled, the regulator device supports disabling and
2653 * machine constraints permit this operation.
2655 int regulator_disable(struct regulator *regulator)
2657 struct regulator_dev *rdev = regulator->rdev;
2658 struct ww_acquire_ctx ww_ctx;
2661 regulator_lock_dependent(rdev, &ww_ctx);
2662 ret = _regulator_disable(regulator);
2663 regulator_unlock_dependent(rdev, &ww_ctx);
2667 EXPORT_SYMBOL_GPL(regulator_disable);
2669 /* locks held by regulator_force_disable() */
2670 static int _regulator_force_disable(struct regulator_dev *rdev)
2674 lockdep_assert_held_once(&rdev->mutex.base);
2676 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2677 REGULATOR_EVENT_PRE_DISABLE, NULL);
2678 if (ret & NOTIFY_STOP_MASK)
2681 ret = _regulator_do_disable(rdev);
2683 rdev_err(rdev, "failed to force disable\n");
2684 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2685 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2689 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2690 REGULATOR_EVENT_DISABLE, NULL);
2696 * regulator_force_disable - force disable regulator output
2697 * @regulator: regulator source
2699 * Forcibly disable the regulator output voltage or current.
2700 * NOTE: this *will* disable the regulator output even if other consumer
2701 * devices have it enabled. This should be used for situations when device
2702 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2704 int regulator_force_disable(struct regulator *regulator)
2706 struct regulator_dev *rdev = regulator->rdev;
2707 struct ww_acquire_ctx ww_ctx;
2710 regulator_lock_dependent(rdev, &ww_ctx);
2712 ret = _regulator_force_disable(regulator->rdev);
2714 if (rdev->coupling_desc.n_coupled > 1)
2715 regulator_balance_voltage(rdev, PM_SUSPEND_ON);
2717 if (regulator->uA_load) {
2718 regulator->uA_load = 0;
2719 ret = drms_uA_update(rdev);
2722 if (rdev->use_count != 0 && rdev->supply)
2723 _regulator_disable(rdev->supply);
2725 regulator_unlock_dependent(rdev, &ww_ctx);
2729 EXPORT_SYMBOL_GPL(regulator_force_disable);
2731 static void regulator_disable_work(struct work_struct *work)
2733 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2735 struct ww_acquire_ctx ww_ctx;
2737 struct regulator *regulator;
2738 int total_count = 0;
2740 regulator_lock_dependent(rdev, &ww_ctx);
2743 * Workqueue functions queue the new work instance while the previous
2744 * work instance is being processed. Cancel the queued work instance
2745 * as the work instance under processing does the job of the queued
2748 cancel_delayed_work(&rdev->disable_work);
2750 list_for_each_entry(regulator, &rdev->consumer_list, list) {
2751 count = regulator->deferred_disables;
2756 total_count += count;
2757 regulator->deferred_disables = 0;
2759 for (i = 0; i < count; i++) {
2760 ret = _regulator_disable(regulator);
2762 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2765 WARN_ON(!total_count);
2767 if (rdev->coupling_desc.n_coupled > 1)
2768 regulator_balance_voltage(rdev, PM_SUSPEND_ON);
2770 regulator_unlock_dependent(rdev, &ww_ctx);
2774 * regulator_disable_deferred - disable regulator output with delay
2775 * @regulator: regulator source
2776 * @ms: milliseconds until the regulator is disabled
2778 * Execute regulator_disable() on the regulator after a delay. This
2779 * is intended for use with devices that require some time to quiesce.
2781 * NOTE: this will only disable the regulator output if no other consumer
2782 * devices have it enabled, the regulator device supports disabling and
2783 * machine constraints permit this operation.
2785 int regulator_disable_deferred(struct regulator *regulator, int ms)
2787 struct regulator_dev *rdev = regulator->rdev;
2790 return regulator_disable(regulator);
2792 regulator_lock(rdev);
2793 regulator->deferred_disables++;
2794 mod_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2795 msecs_to_jiffies(ms));
2796 regulator_unlock(rdev);
2800 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2802 static int _regulator_is_enabled(struct regulator_dev *rdev)
2804 /* A GPIO control always takes precedence */
2806 return rdev->ena_gpio_state;
2808 /* If we don't know then assume that the regulator is always on */
2809 if (!rdev->desc->ops->is_enabled)
2812 return rdev->desc->ops->is_enabled(rdev);
2815 static int _regulator_list_voltage(struct regulator_dev *rdev,
2816 unsigned selector, int lock)
2818 const struct regulator_ops *ops = rdev->desc->ops;
2821 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2822 return rdev->desc->fixed_uV;
2824 if (ops->list_voltage) {
2825 if (selector >= rdev->desc->n_voltages)
2828 regulator_lock(rdev);
2829 ret = ops->list_voltage(rdev, selector);
2831 regulator_unlock(rdev);
2832 } else if (rdev->is_switch && rdev->supply) {
2833 ret = _regulator_list_voltage(rdev->supply->rdev,
2840 if (ret < rdev->constraints->min_uV)
2842 else if (ret > rdev->constraints->max_uV)
2850 * regulator_is_enabled - is the regulator output enabled
2851 * @regulator: regulator source
2853 * Returns positive if the regulator driver backing the source/client
2854 * has requested that the device be enabled, zero if it hasn't, else a
2855 * negative errno code.
2857 * Note that the device backing this regulator handle can have multiple
2858 * users, so it might be enabled even if regulator_enable() was never
2859 * called for this particular source.
2861 int regulator_is_enabled(struct regulator *regulator)
2865 if (regulator->always_on)
2868 regulator_lock(regulator->rdev);
2869 ret = _regulator_is_enabled(regulator->rdev);
2870 regulator_unlock(regulator->rdev);
2874 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2877 * regulator_count_voltages - count regulator_list_voltage() selectors
2878 * @regulator: regulator source
2880 * Returns number of selectors, or negative errno. Selectors are
2881 * numbered starting at zero, and typically correspond to bitfields
2882 * in hardware registers.
2884 int regulator_count_voltages(struct regulator *regulator)
2886 struct regulator_dev *rdev = regulator->rdev;
2888 if (rdev->desc->n_voltages)
2889 return rdev->desc->n_voltages;
2891 if (!rdev->is_switch || !rdev->supply)
2894 return regulator_count_voltages(rdev->supply);
2896 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2899 * regulator_list_voltage - enumerate supported voltages
2900 * @regulator: regulator source
2901 * @selector: identify voltage to list
2902 * Context: can sleep
2904 * Returns a voltage that can be passed to @regulator_set_voltage(),
2905 * zero if this selector code can't be used on this system, or a
2908 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2910 return _regulator_list_voltage(regulator->rdev, selector, 1);
2912 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2915 * regulator_get_regmap - get the regulator's register map
2916 * @regulator: regulator source
2918 * Returns the register map for the given regulator, or an ERR_PTR value
2919 * if the regulator doesn't use regmap.
2921 struct regmap *regulator_get_regmap(struct regulator *regulator)
2923 struct regmap *map = regulator->rdev->regmap;
2925 return map ? map : ERR_PTR(-EOPNOTSUPP);
2929 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2930 * @regulator: regulator source
2931 * @vsel_reg: voltage selector register, output parameter
2932 * @vsel_mask: mask for voltage selector bitfield, output parameter
2934 * Returns the hardware register offset and bitmask used for setting the
2935 * regulator voltage. This might be useful when configuring voltage-scaling
2936 * hardware or firmware that can make I2C requests behind the kernel's back,
2939 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2940 * and 0 is returned, otherwise a negative errno is returned.
2942 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2944 unsigned *vsel_mask)
2946 struct regulator_dev *rdev = regulator->rdev;
2947 const struct regulator_ops *ops = rdev->desc->ops;
2949 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2952 *vsel_reg = rdev->desc->vsel_reg;
2953 *vsel_mask = rdev->desc->vsel_mask;
2957 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2960 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2961 * @regulator: regulator source
2962 * @selector: identify voltage to list
2964 * Converts the selector to a hardware-specific voltage selector that can be
2965 * directly written to the regulator registers. The address of the voltage
2966 * register can be determined by calling @regulator_get_hardware_vsel_register.
2968 * On error a negative errno is returned.
2970 int regulator_list_hardware_vsel(struct regulator *regulator,
2973 struct regulator_dev *rdev = regulator->rdev;
2974 const struct regulator_ops *ops = rdev->desc->ops;
2976 if (selector >= rdev->desc->n_voltages)
2978 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2983 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2986 * regulator_get_linear_step - return the voltage step size between VSEL values
2987 * @regulator: regulator source
2989 * Returns the voltage step size between VSEL values for linear
2990 * regulators, or return 0 if the regulator isn't a linear regulator.
2992 unsigned int regulator_get_linear_step(struct regulator *regulator)
2994 struct regulator_dev *rdev = regulator->rdev;
2996 return rdev->desc->uV_step;
2998 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
3001 * regulator_is_supported_voltage - check if a voltage range can be supported
3003 * @regulator: Regulator to check.
3004 * @min_uV: Minimum required voltage in uV.
3005 * @max_uV: Maximum required voltage in uV.
3007 * Returns a boolean or a negative error code.
3009 int regulator_is_supported_voltage(struct regulator *regulator,
3010 int min_uV, int max_uV)
3012 struct regulator_dev *rdev = regulator->rdev;
3013 int i, voltages, ret;
3015 /* If we can't change voltage check the current voltage */
3016 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
3017 ret = regulator_get_voltage(regulator);
3019 return min_uV <= ret && ret <= max_uV;
3024 /* Any voltage within constrains range is fine? */
3025 if (rdev->desc->continuous_voltage_range)
3026 return min_uV >= rdev->constraints->min_uV &&
3027 max_uV <= rdev->constraints->max_uV;
3029 ret = regulator_count_voltages(regulator);
3034 for (i = 0; i < voltages; i++) {
3035 ret = regulator_list_voltage(regulator, i);
3037 if (ret >= min_uV && ret <= max_uV)
3043 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
3045 static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
3048 const struct regulator_desc *desc = rdev->desc;
3050 if (desc->ops->map_voltage)
3051 return desc->ops->map_voltage(rdev, min_uV, max_uV);
3053 if (desc->ops->list_voltage == regulator_list_voltage_linear)
3054 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
3056 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
3057 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
3059 if (desc->ops->list_voltage ==
3060 regulator_list_voltage_pickable_linear_range)
3061 return regulator_map_voltage_pickable_linear_range(rdev,
3064 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
3067 static int _regulator_call_set_voltage(struct regulator_dev *rdev,
3068 int min_uV, int max_uV,
3071 struct pre_voltage_change_data data;
3074 data.old_uV = _regulator_get_voltage(rdev);
3075 data.min_uV = min_uV;
3076 data.max_uV = max_uV;
3077 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
3079 if (ret & NOTIFY_STOP_MASK)
3082 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
3086 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
3087 (void *)data.old_uV);
3092 static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
3093 int uV, unsigned selector)
3095 struct pre_voltage_change_data data;
3098 data.old_uV = _regulator_get_voltage(rdev);
3101 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
3103 if (ret & NOTIFY_STOP_MASK)
3106 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
3110 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
3111 (void *)data.old_uV);
3116 static int _regulator_set_voltage_time(struct regulator_dev *rdev,
3117 int old_uV, int new_uV)
3119 unsigned int ramp_delay = 0;
3121 if (rdev->constraints->ramp_delay)
3122 ramp_delay = rdev->constraints->ramp_delay;
3123 else if (rdev->desc->ramp_delay)
3124 ramp_delay = rdev->desc->ramp_delay;
3125 else if (rdev->constraints->settling_time)
3126 return rdev->constraints->settling_time;
3127 else if (rdev->constraints->settling_time_up &&
3129 return rdev->constraints->settling_time_up;
3130 else if (rdev->constraints->settling_time_down &&
3132 return rdev->constraints->settling_time_down;
3134 if (ramp_delay == 0) {
3135 rdev_dbg(rdev, "ramp_delay not set\n");
3139 return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
3142 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
3143 int min_uV, int max_uV)
3148 unsigned int selector;
3149 int old_selector = -1;
3150 const struct regulator_ops *ops = rdev->desc->ops;
3151 int old_uV = _regulator_get_voltage(rdev);
3153 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
3155 min_uV += rdev->constraints->uV_offset;
3156 max_uV += rdev->constraints->uV_offset;
3159 * If we can't obtain the old selector there is not enough
3160 * info to call set_voltage_time_sel().
3162 if (_regulator_is_enabled(rdev) &&
3163 ops->set_voltage_time_sel && ops->get_voltage_sel) {
3164 old_selector = ops->get_voltage_sel(rdev);
3165 if (old_selector < 0)
3166 return old_selector;
3169 if (ops->set_voltage) {
3170 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
3174 if (ops->list_voltage)
3175 best_val = ops->list_voltage(rdev,
3178 best_val = _regulator_get_voltage(rdev);
3181 } else if (ops->set_voltage_sel) {
3182 ret = regulator_map_voltage(rdev, min_uV, max_uV);
3184 best_val = ops->list_voltage(rdev, ret);
3185 if (min_uV <= best_val && max_uV >= best_val) {
3187 if (old_selector == selector)
3190 ret = _regulator_call_set_voltage_sel(
3191 rdev, best_val, selector);
3203 if (ops->set_voltage_time_sel) {
3205 * Call set_voltage_time_sel if successfully obtained
3208 if (old_selector >= 0 && old_selector != selector)
3209 delay = ops->set_voltage_time_sel(rdev, old_selector,
3212 if (old_uV != best_val) {
3213 if (ops->set_voltage_time)
3214 delay = ops->set_voltage_time(rdev, old_uV,
3217 delay = _regulator_set_voltage_time(rdev,
3224 rdev_warn(rdev, "failed to get delay: %d\n", delay);
3228 /* Insert any necessary delays */
3229 if (delay >= 1000) {
3230 mdelay(delay / 1000);
3231 udelay(delay % 1000);
3236 if (best_val >= 0) {
3237 unsigned long data = best_val;
3239 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
3244 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
3249 static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev,
3250 int min_uV, int max_uV, suspend_state_t state)
3252 struct regulator_state *rstate;
3255 rstate = regulator_get_suspend_state(rdev, state);
3259 if (min_uV < rstate->min_uV)
3260 min_uV = rstate->min_uV;
3261 if (max_uV > rstate->max_uV)
3262 max_uV = rstate->max_uV;
3264 sel = regulator_map_voltage(rdev, min_uV, max_uV);
3268 uV = rdev->desc->ops->list_voltage(rdev, sel);
3269 if (uV >= min_uV && uV <= max_uV)
3275 static int regulator_set_voltage_unlocked(struct regulator *regulator,
3276 int min_uV, int max_uV,
3277 suspend_state_t state)
3279 struct regulator_dev *rdev = regulator->rdev;
3280 struct regulator_voltage *voltage = ®ulator->voltage[state];
3282 int old_min_uV, old_max_uV;
3285 /* If we're setting the same range as last time the change
3286 * should be a noop (some cpufreq implementations use the same
3287 * voltage for multiple frequencies, for example).
3289 if (voltage->min_uV == min_uV && voltage->max_uV == max_uV)
3292 /* If we're trying to set a range that overlaps the current voltage,
3293 * return successfully even though the regulator does not support
3294 * changing the voltage.
3296 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
3297 current_uV = _regulator_get_voltage(rdev);
3298 if (min_uV <= current_uV && current_uV <= max_uV) {
3299 voltage->min_uV = min_uV;
3300 voltage->max_uV = max_uV;
3306 if (!rdev->desc->ops->set_voltage &&
3307 !rdev->desc->ops->set_voltage_sel) {
3312 /* constraints check */
3313 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3317 /* restore original values in case of error */
3318 old_min_uV = voltage->min_uV;
3319 old_max_uV = voltage->max_uV;
3320 voltage->min_uV = min_uV;
3321 voltage->max_uV = max_uV;
3323 /* for not coupled regulators this will just set the voltage */
3324 ret = regulator_balance_voltage(rdev, state);
3331 voltage->min_uV = old_min_uV;
3332 voltage->max_uV = old_max_uV;
3337 static int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV,
3338 int max_uV, suspend_state_t state)
3340 int best_supply_uV = 0;
3341 int supply_change_uV = 0;
3345 regulator_ops_is_valid(rdev->supply->rdev,
3346 REGULATOR_CHANGE_VOLTAGE) &&
3347 (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage ||
3348 rdev->desc->ops->get_voltage_sel))) {
3349 int current_supply_uV;
3352 selector = regulator_map_voltage(rdev, min_uV, max_uV);
3358 best_supply_uV = _regulator_list_voltage(rdev, selector, 0);
3359 if (best_supply_uV < 0) {
3360 ret = best_supply_uV;
3364 best_supply_uV += rdev->desc->min_dropout_uV;
3366 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
3367 if (current_supply_uV < 0) {
3368 ret = current_supply_uV;
3372 supply_change_uV = best_supply_uV - current_supply_uV;
3375 if (supply_change_uV > 0) {
3376 ret = regulator_set_voltage_unlocked(rdev->supply,
3377 best_supply_uV, INT_MAX, state);
3379 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
3385 if (state == PM_SUSPEND_ON)
3386 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3388 ret = _regulator_do_set_suspend_voltage(rdev, min_uV,
3393 if (supply_change_uV < 0) {
3394 ret = regulator_set_voltage_unlocked(rdev->supply,
3395 best_supply_uV, INT_MAX, state);
3397 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
3399 /* No need to fail here */
3407 static int regulator_limit_voltage_step(struct regulator_dev *rdev,
3408 int *current_uV, int *min_uV)
3410 struct regulation_constraints *constraints = rdev->constraints;
3412 /* Limit voltage change only if necessary */
3413 if (!constraints->max_uV_step || !_regulator_is_enabled(rdev))
3416 if (*current_uV < 0) {
3417 *current_uV = _regulator_get_voltage(rdev);
3419 if (*current_uV < 0)
3423 if (abs(*current_uV - *min_uV) <= constraints->max_uV_step)
3426 /* Clamp target voltage within the given step */
3427 if (*current_uV < *min_uV)
3428 *min_uV = min(*current_uV + constraints->max_uV_step,
3431 *min_uV = max(*current_uV - constraints->max_uV_step,
3437 static int regulator_get_optimal_voltage(struct regulator_dev *rdev,
3439 int *min_uV, int *max_uV,
3440 suspend_state_t state,
3443 struct coupling_desc *c_desc = &rdev->coupling_desc;
3444 struct regulator_dev **c_rdevs = c_desc->coupled_rdevs;
3445 struct regulation_constraints *constraints = rdev->constraints;
3446 int max_spread = constraints->max_spread;
3447 int desired_min_uV = 0, desired_max_uV = INT_MAX;
3448 int max_current_uV = 0, min_current_uV = INT_MAX;
3449 int highest_min_uV = 0, target_uV, possible_uV;
3456 * If there are no coupled regulators, simply set the voltage
3457 * demanded by consumers.
3459 if (n_coupled == 1) {
3461 * If consumers don't provide any demands, set voltage
3464 desired_min_uV = constraints->min_uV;
3465 desired_max_uV = constraints->max_uV;
3467 ret = regulator_check_consumers(rdev,
3469 &desired_max_uV, state);
3473 possible_uV = desired_min_uV;
3479 /* Find highest min desired voltage */
3480 for (i = 0; i < n_coupled; i++) {
3482 int tmp_max = INT_MAX;
3484 lockdep_assert_held_once(&c_rdevs[i]->mutex.base);
3486 ret = regulator_check_consumers(c_rdevs[i],
3492 ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max);
3496 highest_min_uV = max(highest_min_uV, tmp_min);
3499 desired_min_uV = tmp_min;
3500 desired_max_uV = tmp_max;
3505 * Let target_uV be equal to the desired one if possible.
3506 * If not, set it to minimum voltage, allowed by other coupled
3509 target_uV = max(desired_min_uV, highest_min_uV - max_spread);
3512 * Find min and max voltages, which currently aren't violating
3515 for (i = 1; i < n_coupled; i++) {
3518 if (!_regulator_is_enabled(c_rdevs[i]))
3521 tmp_act = _regulator_get_voltage(c_rdevs[i]);
3525 min_current_uV = min(tmp_act, min_current_uV);
3526 max_current_uV = max(tmp_act, max_current_uV);
3529 /* There aren't any other regulators enabled */
3530 if (max_current_uV == 0) {
3531 possible_uV = target_uV;
3534 * Correct target voltage, so as it currently isn't
3535 * violating max_spread
3537 possible_uV = max(target_uV, max_current_uV - max_spread);
3538 possible_uV = min(possible_uV, min_current_uV + max_spread);
3541 if (possible_uV > desired_max_uV)
3544 done = (possible_uV == target_uV);
3545 desired_min_uV = possible_uV;
3548 /* Apply max_uV_step constraint if necessary */
3549 if (state == PM_SUSPEND_ON) {
3550 ret = regulator_limit_voltage_step(rdev, current_uV,
3559 /* Set current_uV if wasn't done earlier in the code and if necessary */
3560 if (n_coupled > 1 && *current_uV == -1) {
3562 if (_regulator_is_enabled(rdev)) {
3563 ret = _regulator_get_voltage(rdev);
3569 *current_uV = desired_min_uV;
3573 *min_uV = desired_min_uV;
3574 *max_uV = desired_max_uV;
3579 static int regulator_balance_voltage(struct regulator_dev *rdev,
3580 suspend_state_t state)
3582 struct regulator_dev **c_rdevs;
3583 struct regulator_dev *best_rdev;
3584 struct coupling_desc *c_desc = &rdev->coupling_desc;
3585 int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev;
3586 bool best_c_rdev_done, c_rdev_done[MAX_COUPLED];
3587 unsigned int delta, best_delta;
3589 c_rdevs = c_desc->coupled_rdevs;
3590 n_coupled = c_desc->n_coupled;
3593 * If system is in a state other than PM_SUSPEND_ON, don't check
3594 * other coupled regulators.
3596 if (state != PM_SUSPEND_ON)
3599 if (c_desc->n_resolved < n_coupled) {
3600 rdev_err(rdev, "Not all coupled regulators registered\n");
3604 for (i = 0; i < n_coupled; i++)
3605 c_rdev_done[i] = false;
3608 * Find the best possible voltage change on each loop. Leave the loop
3609 * if there isn't any possible change.
3612 best_c_rdev_done = false;
3620 * Find highest difference between optimal voltage
3621 * and current voltage.
3623 for (i = 0; i < n_coupled; i++) {
3625 * optimal_uV is the best voltage that can be set for
3626 * i-th regulator at the moment without violating
3627 * max_spread constraint in order to balance
3628 * the coupled voltages.
3630 int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0;
3635 ret = regulator_get_optimal_voltage(c_rdevs[i],
3643 delta = abs(optimal_uV - current_uV);
3645 if (delta && best_delta <= delta) {
3646 best_c_rdev_done = ret;
3648 best_rdev = c_rdevs[i];
3649 best_min_uV = optimal_uV;
3650 best_max_uV = optimal_max_uV;
3655 /* Nothing to change, return successfully */
3661 ret = regulator_set_voltage_rdev(best_rdev, best_min_uV,
3662 best_max_uV, state);
3667 c_rdev_done[best_c_rdev] = best_c_rdev_done;
3669 } while (n_coupled > 1);
3676 * regulator_set_voltage - set regulator output voltage
3677 * @regulator: regulator source
3678 * @min_uV: Minimum required voltage in uV
3679 * @max_uV: Maximum acceptable voltage in uV
3681 * Sets a voltage regulator to the desired output voltage. This can be set
3682 * during any regulator state. IOW, regulator can be disabled or enabled.
3684 * If the regulator is enabled then the voltage will change to the new value
3685 * immediately otherwise if the regulator is disabled the regulator will
3686 * output at the new voltage when enabled.
3688 * NOTE: If the regulator is shared between several devices then the lowest
3689 * request voltage that meets the system constraints will be used.
3690 * Regulator system constraints must be set for this regulator before
3691 * calling this function otherwise this call will fail.
3693 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
3695 struct ww_acquire_ctx ww_ctx;
3698 regulator_lock_dependent(regulator->rdev, &ww_ctx);
3700 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV,
3703 regulator_unlock_dependent(regulator->rdev, &ww_ctx);
3707 EXPORT_SYMBOL_GPL(regulator_set_voltage);
3709 static inline int regulator_suspend_toggle(struct regulator_dev *rdev,
3710 suspend_state_t state, bool en)
3712 struct regulator_state *rstate;
3714 rstate = regulator_get_suspend_state(rdev, state);
3718 if (!rstate->changeable)
3721 rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND;
3726 int regulator_suspend_enable(struct regulator_dev *rdev,
3727 suspend_state_t state)
3729 return regulator_suspend_toggle(rdev, state, true);
3731 EXPORT_SYMBOL_GPL(regulator_suspend_enable);
3733 int regulator_suspend_disable(struct regulator_dev *rdev,
3734 suspend_state_t state)
3736 struct regulator *regulator;
3737 struct regulator_voltage *voltage;
3740 * if any consumer wants this regulator device keeping on in
3741 * suspend states, don't set it as disabled.
3743 list_for_each_entry(regulator, &rdev->consumer_list, list) {
3744 voltage = ®ulator->voltage[state];
3745 if (voltage->min_uV || voltage->max_uV)
3749 return regulator_suspend_toggle(rdev, state, false);
3751 EXPORT_SYMBOL_GPL(regulator_suspend_disable);
3753 static int _regulator_set_suspend_voltage(struct regulator *regulator,
3754 int min_uV, int max_uV,
3755 suspend_state_t state)
3757 struct regulator_dev *rdev = regulator->rdev;
3758 struct regulator_state *rstate;
3760 rstate = regulator_get_suspend_state(rdev, state);
3764 if (rstate->min_uV == rstate->max_uV) {
3765 rdev_err(rdev, "The suspend voltage can't be changed!\n");
3769 return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state);
3772 int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV,
3773 int max_uV, suspend_state_t state)
3775 struct ww_acquire_ctx ww_ctx;
3778 /* PM_SUSPEND_ON is handled by regulator_set_voltage() */
3779 if (regulator_check_states(state) || state == PM_SUSPEND_ON)
3782 regulator_lock_dependent(regulator->rdev, &ww_ctx);
3784 ret = _regulator_set_suspend_voltage(regulator, min_uV,
3787 regulator_unlock_dependent(regulator->rdev, &ww_ctx);
3791 EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage);
3794 * regulator_set_voltage_time - get raise/fall time
3795 * @regulator: regulator source
3796 * @old_uV: starting voltage in microvolts
3797 * @new_uV: target voltage in microvolts
3799 * Provided with the starting and ending voltage, this function attempts to
3800 * calculate the time in microseconds required to rise or fall to this new
3803 int regulator_set_voltage_time(struct regulator *regulator,
3804 int old_uV, int new_uV)
3806 struct regulator_dev *rdev = regulator->rdev;
3807 const struct regulator_ops *ops = rdev->desc->ops;
3813 if (ops->set_voltage_time)
3814 return ops->set_voltage_time(rdev, old_uV, new_uV);
3815 else if (!ops->set_voltage_time_sel)
3816 return _regulator_set_voltage_time(rdev, old_uV, new_uV);
3818 /* Currently requires operations to do this */
3819 if (!ops->list_voltage || !rdev->desc->n_voltages)
3822 for (i = 0; i < rdev->desc->n_voltages; i++) {
3823 /* We only look for exact voltage matches here */
3824 voltage = regulator_list_voltage(regulator, i);
3829 if (voltage == old_uV)
3831 if (voltage == new_uV)
3835 if (old_sel < 0 || new_sel < 0)
3838 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3840 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3843 * regulator_set_voltage_time_sel - get raise/fall time
3844 * @rdev: regulator source device
3845 * @old_selector: selector for starting voltage
3846 * @new_selector: selector for target voltage
3848 * Provided with the starting and target voltage selectors, this function
3849 * returns time in microseconds required to rise or fall to this new voltage
3851 * Drivers providing ramp_delay in regulation_constraints can use this as their
3852 * set_voltage_time_sel() operation.
3854 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3855 unsigned int old_selector,
3856 unsigned int new_selector)
3858 int old_volt, new_volt;
3861 if (!rdev->desc->ops->list_voltage)
3864 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3865 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3867 if (rdev->desc->ops->set_voltage_time)
3868 return rdev->desc->ops->set_voltage_time(rdev, old_volt,
3871 return _regulator_set_voltage_time(rdev, old_volt, new_volt);
3873 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
3876 * regulator_sync_voltage - re-apply last regulator output voltage
3877 * @regulator: regulator source
3879 * Re-apply the last configured voltage. This is intended to be used
3880 * where some external control source the consumer is cooperating with
3881 * has caused the configured voltage to change.
3883 int regulator_sync_voltage(struct regulator *regulator)
3885 struct regulator_dev *rdev = regulator->rdev;
3886 struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON];
3887 int ret, min_uV, max_uV;
3889 regulator_lock(rdev);
3891 if (!rdev->desc->ops->set_voltage &&
3892 !rdev->desc->ops->set_voltage_sel) {
3897 /* This is only going to work if we've had a voltage configured. */
3898 if (!voltage->min_uV && !voltage->max_uV) {
3903 min_uV = voltage->min_uV;
3904 max_uV = voltage->max_uV;
3906 /* This should be a paranoia check... */
3907 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3911 ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0);
3915 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3918 regulator_unlock(rdev);
3921 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3923 static int _regulator_get_voltage(struct regulator_dev *rdev)
3928 if (rdev->desc->ops->get_bypass) {
3929 ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
3933 /* if bypassed the regulator must have a supply */
3934 if (!rdev->supply) {
3936 "bypassed regulator has no supply!\n");
3937 return -EPROBE_DEFER;
3940 return _regulator_get_voltage(rdev->supply->rdev);
3944 if (rdev->desc->ops->get_voltage_sel) {
3945 sel = rdev->desc->ops->get_voltage_sel(rdev);
3948 ret = rdev->desc->ops->list_voltage(rdev, sel);
3949 } else if (rdev->desc->ops->get_voltage) {
3950 ret = rdev->desc->ops->get_voltage(rdev);
3951 } else if (rdev->desc->ops->list_voltage) {
3952 ret = rdev->desc->ops->list_voltage(rdev, 0);
3953 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3954 ret = rdev->desc->fixed_uV;
3955 } else if (rdev->supply) {
3956 ret = _regulator_get_voltage(rdev->supply->rdev);
3963 return ret - rdev->constraints->uV_offset;
3967 * regulator_get_voltage - get regulator output voltage
3968 * @regulator: regulator source
3970 * This returns the current regulator voltage in uV.
3972 * NOTE: If the regulator is disabled it will return the voltage value. This
3973 * function should not be used to determine regulator state.
3975 int regulator_get_voltage(struct regulator *regulator)
3977 struct ww_acquire_ctx ww_ctx;
3980 regulator_lock_dependent(regulator->rdev, &ww_ctx);
3981 ret = _regulator_get_voltage(regulator->rdev);
3982 regulator_unlock_dependent(regulator->rdev, &ww_ctx);
3986 EXPORT_SYMBOL_GPL(regulator_get_voltage);
3989 * regulator_set_current_limit - set regulator output current limit
3990 * @regulator: regulator source
3991 * @min_uA: Minimum supported current in uA
3992 * @max_uA: Maximum supported current in uA
3994 * Sets current sink to the desired output current. This can be set during
3995 * any regulator state. IOW, regulator can be disabled or enabled.
3997 * If the regulator is enabled then the current will change to the new value
3998 * immediately otherwise if the regulator is disabled the regulator will
3999 * output at the new current when enabled.
4001 * NOTE: Regulator system constraints must be set for this regulator before
4002 * calling this function otherwise this call will fail.
4004 int regulator_set_current_limit(struct regulator *regulator,
4005 int min_uA, int max_uA)
4007 struct regulator_dev *rdev = regulator->rdev;
4010 regulator_lock(rdev);
4013 if (!rdev->desc->ops->set_current_limit) {
4018 /* constraints check */
4019 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
4023 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
4025 regulator_unlock(rdev);
4028 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
4030 static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev)
4033 if (!rdev->desc->ops->get_current_limit)
4036 return rdev->desc->ops->get_current_limit(rdev);
4039 static int _regulator_get_current_limit(struct regulator_dev *rdev)
4043 regulator_lock(rdev);
4044 ret = _regulator_get_current_limit_unlocked(rdev);
4045 regulator_unlock(rdev);
4051 * regulator_get_current_limit - get regulator output current
4052 * @regulator: regulator source
4054 * This returns the current supplied by the specified current sink in uA.
4056 * NOTE: If the regulator is disabled it will return the current value. This
4057 * function should not be used to determine regulator state.
4059 int regulator_get_current_limit(struct regulator *regulator)
4061 return _regulator_get_current_limit(regulator->rdev);
4063 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
4066 * regulator_set_mode - set regulator operating mode
4067 * @regulator: regulator source
4068 * @mode: operating mode - one of the REGULATOR_MODE constants
4070 * Set regulator operating mode to increase regulator efficiency or improve
4071 * regulation performance.
4073 * NOTE: Regulator system constraints must be set for this regulator before
4074 * calling this function otherwise this call will fail.
4076 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
4078 struct regulator_dev *rdev = regulator->rdev;
4080 int regulator_curr_mode;
4082 regulator_lock(rdev);
4085 if (!rdev->desc->ops->set_mode) {
4090 /* return if the same mode is requested */
4091 if (rdev->desc->ops->get_mode) {
4092 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
4093 if (regulator_curr_mode == mode) {
4099 /* constraints check */
4100 ret = regulator_mode_constrain(rdev, &mode);
4104 ret = rdev->desc->ops->set_mode(rdev, mode);
4106 regulator_unlock(rdev);
4109 EXPORT_SYMBOL_GPL(regulator_set_mode);
4111 static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev)
4114 if (!rdev->desc->ops->get_mode)
4117 return rdev->desc->ops->get_mode(rdev);
4120 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
4124 regulator_lock(rdev);
4125 ret = _regulator_get_mode_unlocked(rdev);
4126 regulator_unlock(rdev);
4132 * regulator_get_mode - get regulator operating mode
4133 * @regulator: regulator source
4135 * Get the current regulator operating mode.
4137 unsigned int regulator_get_mode(struct regulator *regulator)
4139 return _regulator_get_mode(regulator->rdev);
4141 EXPORT_SYMBOL_GPL(regulator_get_mode);
4143 static int _regulator_get_error_flags(struct regulator_dev *rdev,
4144 unsigned int *flags)
4148 regulator_lock(rdev);
4151 if (!rdev->desc->ops->get_error_flags) {
4156 ret = rdev->desc->ops->get_error_flags(rdev, flags);
4158 regulator_unlock(rdev);
4163 * regulator_get_error_flags - get regulator error information
4164 * @regulator: regulator source
4165 * @flags: pointer to store error flags
4167 * Get the current regulator error information.
4169 int regulator_get_error_flags(struct regulator *regulator,
4170 unsigned int *flags)
4172 return _regulator_get_error_flags(regulator->rdev, flags);
4174 EXPORT_SYMBOL_GPL(regulator_get_error_flags);
4177 * regulator_set_load - set regulator load
4178 * @regulator: regulator source
4179 * @uA_load: load current
4181 * Notifies the regulator core of a new device load. This is then used by
4182 * DRMS (if enabled by constraints) to set the most efficient regulator
4183 * operating mode for the new regulator loading.
4185 * Consumer devices notify their supply regulator of the maximum power
4186 * they will require (can be taken from device datasheet in the power
4187 * consumption tables) when they change operational status and hence power
4188 * state. Examples of operational state changes that can affect power
4189 * consumption are :-
4191 * o Device is opened / closed.
4192 * o Device I/O is about to begin or has just finished.
4193 * o Device is idling in between work.
4195 * This information is also exported via sysfs to userspace.
4197 * DRMS will sum the total requested load on the regulator and change
4198 * to the most efficient operating mode if platform constraints allow.
4200 * NOTE: when a regulator consumer requests to have a regulator
4201 * disabled then any load that consumer requested no longer counts
4202 * toward the total requested load. If the regulator is re-enabled
4203 * then the previously requested load will start counting again.
4205 * If a regulator is an always-on regulator then an individual consumer's
4206 * load will still be removed if that consumer is fully disabled.
4208 * On error a negative errno is returned.
4210 int regulator_set_load(struct regulator *regulator, int uA_load)
4212 struct regulator_dev *rdev = regulator->rdev;
4216 regulator_lock(rdev);
4217 old_uA_load = regulator->uA_load;
4218 regulator->uA_load = uA_load;
4219 if (regulator->enable_count && old_uA_load != uA_load) {
4220 ret = drms_uA_update(rdev);
4222 regulator->uA_load = old_uA_load;
4224 regulator_unlock(rdev);
4228 EXPORT_SYMBOL_GPL(regulator_set_load);
4231 * regulator_allow_bypass - allow the regulator to go into bypass mode
4233 * @regulator: Regulator to configure
4234 * @enable: enable or disable bypass mode
4236 * Allow the regulator to go into bypass mode if all other consumers
4237 * for the regulator also enable bypass mode and the machine
4238 * constraints allow this. Bypass mode means that the regulator is
4239 * simply passing the input directly to the output with no regulation.
4241 int regulator_allow_bypass(struct regulator *regulator, bool enable)
4243 struct regulator_dev *rdev = regulator->rdev;
4246 if (!rdev->desc->ops->set_bypass)
4249 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS))
4252 regulator_lock(rdev);
4254 if (enable && !regulator->bypass) {
4255 rdev->bypass_count++;
4257 if (rdev->bypass_count == rdev->open_count) {
4258 ret = rdev->desc->ops->set_bypass(rdev, enable);
4260 rdev->bypass_count--;
4263 } else if (!enable && regulator->bypass) {
4264 rdev->bypass_count--;
4266 if (rdev->bypass_count != rdev->open_count) {
4267 ret = rdev->desc->ops->set_bypass(rdev, enable);
4269 rdev->bypass_count++;
4274 regulator->bypass = enable;
4276 regulator_unlock(rdev);
4280 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
4283 * regulator_register_notifier - register regulator event notifier
4284 * @regulator: regulator source
4285 * @nb: notifier block
4287 * Register notifier block to receive regulator events.
4289 int regulator_register_notifier(struct regulator *regulator,
4290 struct notifier_block *nb)
4292 return blocking_notifier_chain_register(®ulator->rdev->notifier,
4295 EXPORT_SYMBOL_GPL(regulator_register_notifier);
4298 * regulator_unregister_notifier - unregister regulator event notifier
4299 * @regulator: regulator source
4300 * @nb: notifier block
4302 * Unregister regulator event notifier block.
4304 int regulator_unregister_notifier(struct regulator *regulator,
4305 struct notifier_block *nb)
4307 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
4310 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
4312 /* notify regulator consumers and downstream regulator consumers.
4313 * Note mutex must be held by caller.
4315 static int _notifier_call_chain(struct regulator_dev *rdev,
4316 unsigned long event, void *data)
4318 /* call rdev chain first */
4319 return blocking_notifier_call_chain(&rdev->notifier, event, data);
4323 * regulator_bulk_get - get multiple regulator consumers
4325 * @dev: Device to supply
4326 * @num_consumers: Number of consumers to register
4327 * @consumers: Configuration of consumers; clients are stored here.
4329 * @return 0 on success, an errno on failure.
4331 * This helper function allows drivers to get several regulator
4332 * consumers in one operation. If any of the regulators cannot be
4333 * acquired then any regulators that were allocated will be freed
4334 * before returning to the caller.
4336 int regulator_bulk_get(struct device *dev, int num_consumers,
4337 struct regulator_bulk_data *consumers)
4342 for (i = 0; i < num_consumers; i++)
4343 consumers[i].consumer = NULL;
4345 for (i = 0; i < num_consumers; i++) {
4346 consumers[i].consumer = regulator_get(dev,
4347 consumers[i].supply);
4348 if (IS_ERR(consumers[i].consumer)) {
4349 ret = PTR_ERR(consumers[i].consumer);
4350 dev_err(dev, "Failed to get supply '%s': %d\n",
4351 consumers[i].supply, ret);
4352 consumers[i].consumer = NULL;
4361 regulator_put(consumers[i].consumer);
4365 EXPORT_SYMBOL_GPL(regulator_bulk_get);
4367 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
4369 struct regulator_bulk_data *bulk = data;
4371 bulk->ret = regulator_enable(bulk->consumer);
4375 * regulator_bulk_enable - enable multiple regulator consumers
4377 * @num_consumers: Number of consumers
4378 * @consumers: Consumer data; clients are stored here.
4379 * @return 0 on success, an errno on failure
4381 * This convenience API allows consumers to enable multiple regulator
4382 * clients in a single API call. If any consumers cannot be enabled
4383 * then any others that were enabled will be disabled again prior to
4386 int regulator_bulk_enable(int num_consumers,
4387 struct regulator_bulk_data *consumers)
4389 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
4393 for (i = 0; i < num_consumers; i++) {
4394 async_schedule_domain(regulator_bulk_enable_async,
4395 &consumers[i], &async_domain);
4398 async_synchronize_full_domain(&async_domain);
4400 /* If any consumer failed we need to unwind any that succeeded */
4401 for (i = 0; i < num_consumers; i++) {
4402 if (consumers[i].ret != 0) {
4403 ret = consumers[i].ret;
4411 for (i = 0; i < num_consumers; i++) {
4412 if (consumers[i].ret < 0)
4413 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
4416 regulator_disable(consumers[i].consumer);
4421 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
4424 * regulator_bulk_disable - disable multiple regulator consumers
4426 * @num_consumers: Number of consumers
4427 * @consumers: Consumer data; clients are stored here.
4428 * @return 0 on success, an errno on failure
4430 * This convenience API allows consumers to disable multiple regulator
4431 * clients in a single API call. If any consumers cannot be disabled
4432 * then any others that were disabled will be enabled again prior to
4435 int regulator_bulk_disable(int num_consumers,
4436 struct regulator_bulk_data *consumers)
4441 for (i = num_consumers - 1; i >= 0; --i) {
4442 ret = regulator_disable(consumers[i].consumer);
4450 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
4451 for (++i; i < num_consumers; ++i) {
4452 r = regulator_enable(consumers[i].consumer);
4454 pr_err("Failed to re-enable %s: %d\n",
4455 consumers[i].supply, r);
4460 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
4463 * regulator_bulk_force_disable - force disable multiple regulator consumers
4465 * @num_consumers: Number of consumers
4466 * @consumers: Consumer data; clients are stored here.
4467 * @return 0 on success, an errno on failure
4469 * This convenience API allows consumers to forcibly disable multiple regulator
4470 * clients in a single API call.
4471 * NOTE: This should be used for situations when device damage will
4472 * likely occur if the regulators are not disabled (e.g. over temp).
4473 * Although regulator_force_disable function call for some consumers can
4474 * return error numbers, the function is called for all consumers.
4476 int regulator_bulk_force_disable(int num_consumers,
4477 struct regulator_bulk_data *consumers)
4482 for (i = 0; i < num_consumers; i++) {
4484 regulator_force_disable(consumers[i].consumer);
4486 /* Store first error for reporting */
4487 if (consumers[i].ret && !ret)
4488 ret = consumers[i].ret;
4493 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
4496 * regulator_bulk_free - free multiple regulator consumers
4498 * @num_consumers: Number of consumers
4499 * @consumers: Consumer data; clients are stored here.
4501 * This convenience API allows consumers to free multiple regulator
4502 * clients in a single API call.
4504 void regulator_bulk_free(int num_consumers,
4505 struct regulator_bulk_data *consumers)
4509 for (i = 0; i < num_consumers; i++) {
4510 regulator_put(consumers[i].consumer);
4511 consumers[i].consumer = NULL;
4514 EXPORT_SYMBOL_GPL(regulator_bulk_free);
4517 * regulator_notifier_call_chain - call regulator event notifier
4518 * @rdev: regulator source
4519 * @event: notifier block
4520 * @data: callback-specific data.
4522 * Called by regulator drivers to notify clients a regulator event has
4523 * occurred. We also notify regulator clients downstream.
4524 * Note lock must be held by caller.
4526 int regulator_notifier_call_chain(struct regulator_dev *rdev,
4527 unsigned long event, void *data)
4529 lockdep_assert_held_once(&rdev->mutex.base);
4531 _notifier_call_chain(rdev, event, data);
4535 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
4538 * regulator_mode_to_status - convert a regulator mode into a status
4540 * @mode: Mode to convert
4542 * Convert a regulator mode into a status.
4544 int regulator_mode_to_status(unsigned int mode)
4547 case REGULATOR_MODE_FAST:
4548 return REGULATOR_STATUS_FAST;
4549 case REGULATOR_MODE_NORMAL:
4550 return REGULATOR_STATUS_NORMAL;
4551 case REGULATOR_MODE_IDLE:
4552 return REGULATOR_STATUS_IDLE;
4553 case REGULATOR_MODE_STANDBY:
4554 return REGULATOR_STATUS_STANDBY;
4556 return REGULATOR_STATUS_UNDEFINED;
4559 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
4561 static struct attribute *regulator_dev_attrs[] = {
4562 &dev_attr_name.attr,
4563 &dev_attr_num_users.attr,
4564 &dev_attr_type.attr,
4565 &dev_attr_microvolts.attr,
4566 &dev_attr_microamps.attr,
4567 &dev_attr_opmode.attr,
4568 &dev_attr_state.attr,
4569 &dev_attr_status.attr,
4570 &dev_attr_bypass.attr,
4571 &dev_attr_requested_microamps.attr,
4572 &dev_attr_min_microvolts.attr,
4573 &dev_attr_max_microvolts.attr,
4574 &dev_attr_min_microamps.attr,
4575 &dev_attr_max_microamps.attr,
4576 &dev_attr_suspend_standby_state.attr,
4577 &dev_attr_suspend_mem_state.attr,
4578 &dev_attr_suspend_disk_state.attr,
4579 &dev_attr_suspend_standby_microvolts.attr,
4580 &dev_attr_suspend_mem_microvolts.attr,
4581 &dev_attr_suspend_disk_microvolts.attr,
4582 &dev_attr_suspend_standby_mode.attr,
4583 &dev_attr_suspend_mem_mode.attr,
4584 &dev_attr_suspend_disk_mode.attr,
4589 * To avoid cluttering sysfs (and memory) with useless state, only
4590 * create attributes that can be meaningfully displayed.
4592 static umode_t regulator_attr_is_visible(struct kobject *kobj,
4593 struct attribute *attr, int idx)
4595 struct device *dev = kobj_to_dev(kobj);
4596 struct regulator_dev *rdev = dev_to_rdev(dev);
4597 const struct regulator_ops *ops = rdev->desc->ops;
4598 umode_t mode = attr->mode;
4600 /* these three are always present */
4601 if (attr == &dev_attr_name.attr ||
4602 attr == &dev_attr_num_users.attr ||
4603 attr == &dev_attr_type.attr)
4606 /* some attributes need specific methods to be displayed */
4607 if (attr == &dev_attr_microvolts.attr) {
4608 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
4609 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
4610 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
4611 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
4616 if (attr == &dev_attr_microamps.attr)
4617 return ops->get_current_limit ? mode : 0;
4619 if (attr == &dev_attr_opmode.attr)
4620 return ops->get_mode ? mode : 0;
4622 if (attr == &dev_attr_state.attr)
4623 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
4625 if (attr == &dev_attr_status.attr)
4626 return ops->get_status ? mode : 0;
4628 if (attr == &dev_attr_bypass.attr)
4629 return ops->get_bypass ? mode : 0;
4631 /* constraints need specific supporting methods */
4632 if (attr == &dev_attr_min_microvolts.attr ||
4633 attr == &dev_attr_max_microvolts.attr)
4634 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
4636 if (attr == &dev_attr_min_microamps.attr ||
4637 attr == &dev_attr_max_microamps.attr)
4638 return ops->set_current_limit ? mode : 0;
4640 if (attr == &dev_attr_suspend_standby_state.attr ||
4641 attr == &dev_attr_suspend_mem_state.attr ||
4642 attr == &dev_attr_suspend_disk_state.attr)
4645 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
4646 attr == &dev_attr_suspend_mem_microvolts.attr ||
4647 attr == &dev_attr_suspend_disk_microvolts.attr)
4648 return ops->set_suspend_voltage ? mode : 0;
4650 if (attr == &dev_attr_suspend_standby_mode.attr ||
4651 attr == &dev_attr_suspend_mem_mode.attr ||
4652 attr == &dev_attr_suspend_disk_mode.attr)
4653 return ops->set_suspend_mode ? mode : 0;
4658 static const struct attribute_group regulator_dev_group = {
4659 .attrs = regulator_dev_attrs,
4660 .is_visible = regulator_attr_is_visible,
4663 static const struct attribute_group *regulator_dev_groups[] = {
4664 ®ulator_dev_group,
4668 static void regulator_dev_release(struct device *dev)
4670 struct regulator_dev *rdev = dev_get_drvdata(dev);
4672 kfree(rdev->constraints);
4673 of_node_put(rdev->dev.of_node);
4677 static void rdev_init_debugfs(struct regulator_dev *rdev)
4679 struct device *parent = rdev->dev.parent;
4680 const char *rname = rdev_get_name(rdev);
4681 char name[NAME_MAX];
4683 /* Avoid duplicate debugfs directory names */
4684 if (parent && rname == rdev->desc->name) {
4685 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
4690 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
4691 if (!rdev->debugfs) {
4692 rdev_warn(rdev, "Failed to create debugfs directory\n");
4696 debugfs_create_u32("use_count", 0444, rdev->debugfs,
4698 debugfs_create_u32("open_count", 0444, rdev->debugfs,
4700 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
4701 &rdev->bypass_count);
4704 static int regulator_register_resolve_supply(struct device *dev, void *data)
4706 struct regulator_dev *rdev = dev_to_rdev(dev);
4708 if (regulator_resolve_supply(rdev))
4709 rdev_dbg(rdev, "unable to resolve supply\n");
4714 static void regulator_resolve_coupling(struct regulator_dev *rdev)
4716 struct coupling_desc *c_desc = &rdev->coupling_desc;
4717 int n_coupled = c_desc->n_coupled;
4718 struct regulator_dev *c_rdev;
4721 for (i = 1; i < n_coupled; i++) {
4722 /* already resolved */
4723 if (c_desc->coupled_rdevs[i])
4726 c_rdev = of_parse_coupled_regulator(rdev, i - 1);
4731 regulator_lock(c_rdev);
4733 c_desc->coupled_rdevs[i] = c_rdev;
4734 c_desc->n_resolved++;
4736 regulator_unlock(c_rdev);
4738 regulator_resolve_coupling(c_rdev);
4742 static void regulator_remove_coupling(struct regulator_dev *rdev)
4744 struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc;
4745 struct regulator_dev *__c_rdev, *c_rdev;
4746 unsigned int __n_coupled, n_coupled;
4749 n_coupled = c_desc->n_coupled;
4751 for (i = 1; i < n_coupled; i++) {
4752 c_rdev = c_desc->coupled_rdevs[i];
4757 regulator_lock(c_rdev);
4759 __c_desc = &c_rdev->coupling_desc;
4760 __n_coupled = __c_desc->n_coupled;
4762 for (k = 1; k < __n_coupled; k++) {
4763 __c_rdev = __c_desc->coupled_rdevs[k];
4765 if (__c_rdev == rdev) {
4766 __c_desc->coupled_rdevs[k] = NULL;
4767 __c_desc->n_resolved--;
4772 regulator_unlock(c_rdev);
4774 c_desc->coupled_rdevs[i] = NULL;
4775 c_desc->n_resolved--;
4779 static int regulator_init_coupling(struct regulator_dev *rdev)
4783 if (!IS_ENABLED(CONFIG_OF))
4786 n_phandles = of_get_n_coupled(rdev);
4788 if (n_phandles + 1 > MAX_COUPLED) {
4789 rdev_err(rdev, "too many regulators coupled\n");
4794 * Every regulator should always have coupling descriptor filled with
4795 * at least pointer to itself.
4797 rdev->coupling_desc.coupled_rdevs[0] = rdev;
4798 rdev->coupling_desc.n_coupled = n_phandles + 1;
4799 rdev->coupling_desc.n_resolved++;
4801 /* regulator isn't coupled */
4802 if (n_phandles == 0)
4805 /* regulator, which can't change its voltage, can't be coupled */
4806 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
4807 rdev_err(rdev, "voltage operation not allowed\n");
4811 if (rdev->constraints->max_spread <= 0) {
4812 rdev_err(rdev, "wrong max_spread value\n");
4816 if (!of_check_coupling_data(rdev))
4823 * regulator_register - register regulator
4824 * @regulator_desc: regulator to register
4825 * @cfg: runtime configuration for regulator
4827 * Called by regulator drivers to register a regulator.
4828 * Returns a valid pointer to struct regulator_dev on success
4829 * or an ERR_PTR() on error.
4831 struct regulator_dev *
4832 regulator_register(const struct regulator_desc *regulator_desc,
4833 const struct regulator_config *cfg)
4835 const struct regulation_constraints *constraints = NULL;
4836 const struct regulator_init_data *init_data;
4837 struct regulator_config *config = NULL;
4838 static atomic_t regulator_no = ATOMIC_INIT(-1);
4839 struct regulator_dev *rdev;
4840 bool dangling_cfg_gpiod = false;
4841 bool dangling_of_gpiod = false;
4846 return ERR_PTR(-EINVAL);
4848 dangling_cfg_gpiod = true;
4849 if (regulator_desc == NULL) {
4857 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) {
4862 if (regulator_desc->type != REGULATOR_VOLTAGE &&
4863 regulator_desc->type != REGULATOR_CURRENT) {
4868 /* Only one of each should be implemented */
4869 WARN_ON(regulator_desc->ops->get_voltage &&
4870 regulator_desc->ops->get_voltage_sel);
4871 WARN_ON(regulator_desc->ops->set_voltage &&
4872 regulator_desc->ops->set_voltage_sel);
4874 /* If we're using selectors we must implement list_voltage. */
4875 if (regulator_desc->ops->get_voltage_sel &&
4876 !regulator_desc->ops->list_voltage) {
4880 if (regulator_desc->ops->set_voltage_sel &&
4881 !regulator_desc->ops->list_voltage) {
4886 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
4893 * Duplicate the config so the driver could override it after
4894 * parsing init data.
4896 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
4897 if (config == NULL) {
4903 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
4904 &rdev->dev.of_node);
4906 * We need to keep track of any GPIO descriptor coming from the
4907 * device tree until we have handled it over to the core. If the
4908 * config that was passed in to this function DOES NOT contain
4909 * a descriptor, and the config after this call DOES contain
4910 * a descriptor, we definitely got one from parsing the device
4913 if (!cfg->ena_gpiod && config->ena_gpiod)
4914 dangling_of_gpiod = true;
4916 init_data = config->init_data;
4917 rdev->dev.of_node = of_node_get(config->of_node);
4920 ww_mutex_init(&rdev->mutex, ®ulator_ww_class);
4921 rdev->reg_data = config->driver_data;
4922 rdev->owner = regulator_desc->owner;
4923 rdev->desc = regulator_desc;
4925 rdev->regmap = config->regmap;
4926 else if (dev_get_regmap(dev, NULL))
4927 rdev->regmap = dev_get_regmap(dev, NULL);
4928 else if (dev->parent)
4929 rdev->regmap = dev_get_regmap(dev->parent, NULL);
4930 INIT_LIST_HEAD(&rdev->consumer_list);
4931 INIT_LIST_HEAD(&rdev->list);
4932 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
4933 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
4935 /* preform any regulator specific init */
4936 if (init_data && init_data->regulator_init) {
4937 ret = init_data->regulator_init(rdev->reg_data);
4942 if (config->ena_gpiod) {
4943 mutex_lock(®ulator_list_mutex);
4944 ret = regulator_ena_gpio_request(rdev, config);
4945 mutex_unlock(®ulator_list_mutex);
4947 rdev_err(rdev, "Failed to request enable GPIO: %d\n",
4951 /* The regulator core took over the GPIO descriptor */
4952 dangling_cfg_gpiod = false;
4953 dangling_of_gpiod = false;
4956 /* register with sysfs */
4957 rdev->dev.class = ®ulator_class;
4958 rdev->dev.parent = dev;
4959 dev_set_name(&rdev->dev, "regulator.%lu",
4960 (unsigned long) atomic_inc_return(®ulator_no));
4962 /* set regulator constraints */
4964 constraints = &init_data->constraints;
4966 if (init_data && init_data->supply_regulator)
4967 rdev->supply_name = init_data->supply_regulator;
4968 else if (regulator_desc->supply_name)
4969 rdev->supply_name = regulator_desc->supply_name;
4972 * Attempt to resolve the regulator supply, if specified,
4973 * but don't return an error if we fail because we will try
4974 * to resolve it again later as more regulators are added.
4976 if (regulator_resolve_supply(rdev))
4977 rdev_dbg(rdev, "unable to resolve supply\n");
4979 ret = set_machine_constraints(rdev, constraints);
4983 ret = regulator_init_coupling(rdev);
4987 /* add consumers devices */
4989 mutex_lock(®ulator_list_mutex);
4990 for (i = 0; i < init_data->num_consumer_supplies; i++) {
4991 ret = set_consumer_device_supply(rdev,
4992 init_data->consumer_supplies[i].dev_name,
4993 init_data->consumer_supplies[i].supply);
4995 mutex_unlock(®ulator_list_mutex);
4996 dev_err(dev, "Failed to set supply %s\n",
4997 init_data->consumer_supplies[i].supply);
4998 goto unset_supplies;
5001 mutex_unlock(®ulator_list_mutex);
5004 if (!rdev->desc->ops->get_voltage &&
5005 !rdev->desc->ops->list_voltage &&
5006 !rdev->desc->fixed_uV)
5007 rdev->is_switch = true;
5009 dev_set_drvdata(&rdev->dev, rdev);
5010 ret = device_register(&rdev->dev);
5012 put_device(&rdev->dev);
5013 goto unset_supplies;
5016 rdev_init_debugfs(rdev);
5018 /* try to resolve regulators coupling since a new one was registered */
5019 mutex_lock(®ulator_list_mutex);
5020 regulator_resolve_coupling(rdev);
5021 mutex_unlock(®ulator_list_mutex);
5023 /* try to resolve regulators supply since a new one was registered */
5024 class_for_each_device(®ulator_class, NULL, NULL,
5025 regulator_register_resolve_supply);
5030 mutex_lock(®ulator_list_mutex);
5031 unset_regulator_supplies(rdev);
5032 mutex_unlock(®ulator_list_mutex);
5034 kfree(rdev->constraints);
5035 mutex_lock(®ulator_list_mutex);
5036 regulator_ena_gpio_free(rdev);
5037 mutex_unlock(®ulator_list_mutex);
5039 if (dangling_of_gpiod)
5040 gpiod_put(config->ena_gpiod);
5044 if (dangling_cfg_gpiod)
5045 gpiod_put(cfg->ena_gpiod);
5046 return ERR_PTR(ret);
5048 EXPORT_SYMBOL_GPL(regulator_register);
5051 * regulator_unregister - unregister regulator
5052 * @rdev: regulator to unregister
5054 * Called by regulator drivers to unregister a regulator.
5056 void regulator_unregister(struct regulator_dev *rdev)
5062 while (rdev->use_count--)
5063 regulator_disable(rdev->supply);
5064 regulator_put(rdev->supply);
5067 mutex_lock(®ulator_list_mutex);
5069 debugfs_remove_recursive(rdev->debugfs);
5070 flush_work(&rdev->disable_work.work);
5071 WARN_ON(rdev->open_count);
5072 regulator_remove_coupling(rdev);
5073 unset_regulator_supplies(rdev);
5074 list_del(&rdev->list);
5075 regulator_ena_gpio_free(rdev);
5076 device_unregister(&rdev->dev);
5078 mutex_unlock(®ulator_list_mutex);
5080 EXPORT_SYMBOL_GPL(regulator_unregister);
5082 #ifdef CONFIG_SUSPEND
5084 * regulator_suspend - prepare regulators for system wide suspend
5085 * @dev: ``&struct device`` pointer that is passed to _regulator_suspend()
5087 * Configure each regulator with it's suspend operating parameters for state.
5089 static int regulator_suspend(struct device *dev)
5091 struct regulator_dev *rdev = dev_to_rdev(dev);
5092 suspend_state_t state = pm_suspend_target_state;
5095 regulator_lock(rdev);
5096 ret = suspend_set_state(rdev, state);
5097 regulator_unlock(rdev);
5102 static int regulator_resume(struct device *dev)
5104 suspend_state_t state = pm_suspend_target_state;
5105 struct regulator_dev *rdev = dev_to_rdev(dev);
5106 struct regulator_state *rstate;
5109 rstate = regulator_get_suspend_state(rdev, state);
5113 regulator_lock(rdev);
5115 if (rdev->desc->ops->resume &&
5116 (rstate->enabled == ENABLE_IN_SUSPEND ||
5117 rstate->enabled == DISABLE_IN_SUSPEND))
5118 ret = rdev->desc->ops->resume(rdev);
5120 regulator_unlock(rdev);
5124 #else /* !CONFIG_SUSPEND */
5126 #define regulator_suspend NULL
5127 #define regulator_resume NULL
5129 #endif /* !CONFIG_SUSPEND */
5132 static const struct dev_pm_ops __maybe_unused regulator_pm_ops = {
5133 .suspend = regulator_suspend,
5134 .resume = regulator_resume,
5138 struct class regulator_class = {
5139 .name = "regulator",
5140 .dev_release = regulator_dev_release,
5141 .dev_groups = regulator_dev_groups,
5143 .pm = ®ulator_pm_ops,
5147 * regulator_has_full_constraints - the system has fully specified constraints
5149 * Calling this function will cause the regulator API to disable all
5150 * regulators which have a zero use count and don't have an always_on
5151 * constraint in a late_initcall.
5153 * The intention is that this will become the default behaviour in a
5154 * future kernel release so users are encouraged to use this facility
5157 void regulator_has_full_constraints(void)
5159 has_full_constraints = 1;
5161 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
5164 * rdev_get_drvdata - get rdev regulator driver data
5167 * Get rdev regulator driver private data. This call can be used in the
5168 * regulator driver context.
5170 void *rdev_get_drvdata(struct regulator_dev *rdev)
5172 return rdev->reg_data;
5174 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
5177 * regulator_get_drvdata - get regulator driver data
5178 * @regulator: regulator
5180 * Get regulator driver private data. This call can be used in the consumer
5181 * driver context when non API regulator specific functions need to be called.
5183 void *regulator_get_drvdata(struct regulator *regulator)
5185 return regulator->rdev->reg_data;
5187 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
5190 * regulator_set_drvdata - set regulator driver data
5191 * @regulator: regulator
5194 void regulator_set_drvdata(struct regulator *regulator, void *data)
5196 regulator->rdev->reg_data = data;
5198 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
5201 * regulator_get_id - get regulator ID
5204 int rdev_get_id(struct regulator_dev *rdev)
5206 return rdev->desc->id;
5208 EXPORT_SYMBOL_GPL(rdev_get_id);
5210 struct device *rdev_get_dev(struct regulator_dev *rdev)
5214 EXPORT_SYMBOL_GPL(rdev_get_dev);
5216 struct regmap *rdev_get_regmap(struct regulator_dev *rdev)
5218 return rdev->regmap;
5220 EXPORT_SYMBOL_GPL(rdev_get_regmap);
5222 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
5224 return reg_init_data->driver_data;
5226 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
5228 #ifdef CONFIG_DEBUG_FS
5229 static int supply_map_show(struct seq_file *sf, void *data)
5231 struct regulator_map *map;
5233 list_for_each_entry(map, ®ulator_map_list, list) {
5234 seq_printf(sf, "%s -> %s.%s\n",
5235 rdev_get_name(map->regulator), map->dev_name,
5241 DEFINE_SHOW_ATTRIBUTE(supply_map);
5243 struct summary_data {
5245 struct regulator_dev *parent;
5249 static void regulator_summary_show_subtree(struct seq_file *s,
5250 struct regulator_dev *rdev,
5253 static int regulator_summary_show_children(struct device *dev, void *data)
5255 struct regulator_dev *rdev = dev_to_rdev(dev);
5256 struct summary_data *summary_data = data;
5258 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
5259 regulator_summary_show_subtree(summary_data->s, rdev,
5260 summary_data->level + 1);
5265 static void regulator_summary_show_subtree(struct seq_file *s,
5266 struct regulator_dev *rdev,
5269 struct regulation_constraints *c;
5270 struct regulator *consumer;
5271 struct summary_data summary_data;
5272 unsigned int opmode;
5277 opmode = _regulator_get_mode_unlocked(rdev);
5278 seq_printf(s, "%*s%-*s %3d %4d %6d %7s ",
5280 30 - level * 3, rdev_get_name(rdev),
5281 rdev->use_count, rdev->open_count, rdev->bypass_count,
5282 regulator_opmode_to_str(opmode));
5284 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
5285 seq_printf(s, "%5dmA ",
5286 _regulator_get_current_limit_unlocked(rdev) / 1000);
5288 c = rdev->constraints;
5290 switch (rdev->desc->type) {
5291 case REGULATOR_VOLTAGE:
5292 seq_printf(s, "%5dmV %5dmV ",
5293 c->min_uV / 1000, c->max_uV / 1000);
5295 case REGULATOR_CURRENT:
5296 seq_printf(s, "%5dmA %5dmA ",
5297 c->min_uA / 1000, c->max_uA / 1000);
5304 list_for_each_entry(consumer, &rdev->consumer_list, list) {
5305 if (consumer->dev && consumer->dev->class == ®ulator_class)
5308 seq_printf(s, "%*s%-*s ",
5309 (level + 1) * 3 + 1, "",
5310 30 - (level + 1) * 3,
5311 consumer->dev ? dev_name(consumer->dev) : "deviceless");
5313 switch (rdev->desc->type) {
5314 case REGULATOR_VOLTAGE:
5315 seq_printf(s, "%3d %33dmA%c%5dmV %5dmV",
5316 consumer->enable_count,
5317 consumer->uA_load / 1000,
5318 consumer->uA_load && !consumer->enable_count ?
5320 consumer->voltage[PM_SUSPEND_ON].min_uV / 1000,
5321 consumer->voltage[PM_SUSPEND_ON].max_uV / 1000);
5323 case REGULATOR_CURRENT:
5331 summary_data.level = level;
5332 summary_data.parent = rdev;
5334 class_for_each_device(®ulator_class, NULL, &summary_data,
5335 regulator_summary_show_children);
5338 struct summary_lock_data {
5339 struct ww_acquire_ctx *ww_ctx;
5340 struct regulator_dev **new_contended_rdev;
5341 struct regulator_dev **old_contended_rdev;
5344 static int regulator_summary_lock_one(struct device *dev, void *data)
5346 struct regulator_dev *rdev = dev_to_rdev(dev);
5347 struct summary_lock_data *lock_data = data;
5350 if (rdev != *lock_data->old_contended_rdev) {
5351 ret = regulator_lock_nested(rdev, lock_data->ww_ctx);
5353 if (ret == -EDEADLK)
5354 *lock_data->new_contended_rdev = rdev;
5358 *lock_data->old_contended_rdev = NULL;
5364 static int regulator_summary_unlock_one(struct device *dev, void *data)
5366 struct regulator_dev *rdev = dev_to_rdev(dev);
5367 struct summary_lock_data *lock_data = data;
5370 if (rdev == *lock_data->new_contended_rdev)
5374 regulator_unlock(rdev);
5379 static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx,
5380 struct regulator_dev **new_contended_rdev,
5381 struct regulator_dev **old_contended_rdev)
5383 struct summary_lock_data lock_data;
5386 lock_data.ww_ctx = ww_ctx;
5387 lock_data.new_contended_rdev = new_contended_rdev;
5388 lock_data.old_contended_rdev = old_contended_rdev;
5390 ret = class_for_each_device(®ulator_class, NULL, &lock_data,
5391 regulator_summary_lock_one);
5393 class_for_each_device(®ulator_class, NULL, &lock_data,
5394 regulator_summary_unlock_one);
5399 static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx)
5401 struct regulator_dev *new_contended_rdev = NULL;
5402 struct regulator_dev *old_contended_rdev = NULL;
5405 mutex_lock(®ulator_list_mutex);
5407 ww_acquire_init(ww_ctx, ®ulator_ww_class);
5410 if (new_contended_rdev) {
5411 ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx);
5412 old_contended_rdev = new_contended_rdev;
5413 old_contended_rdev->ref_cnt++;
5416 err = regulator_summary_lock_all(ww_ctx,
5417 &new_contended_rdev,
5418 &old_contended_rdev);
5420 if (old_contended_rdev)
5421 regulator_unlock(old_contended_rdev);
5423 } while (err == -EDEADLK);
5425 ww_acquire_done(ww_ctx);
5428 static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx)
5430 class_for_each_device(®ulator_class, NULL, NULL,
5431 regulator_summary_unlock_one);
5432 ww_acquire_fini(ww_ctx);
5434 mutex_unlock(®ulator_list_mutex);
5437 static int regulator_summary_show_roots(struct device *dev, void *data)
5439 struct regulator_dev *rdev = dev_to_rdev(dev);
5440 struct seq_file *s = data;
5443 regulator_summary_show_subtree(s, rdev, 0);
5448 static int regulator_summary_show(struct seq_file *s, void *data)
5450 struct ww_acquire_ctx ww_ctx;
5452 seq_puts(s, " regulator use open bypass opmode voltage current min max\n");
5453 seq_puts(s, "---------------------------------------------------------------------------------------\n");
5455 regulator_summary_lock(&ww_ctx);
5457 class_for_each_device(®ulator_class, NULL, s,
5458 regulator_summary_show_roots);
5460 regulator_summary_unlock(&ww_ctx);
5464 DEFINE_SHOW_ATTRIBUTE(regulator_summary);
5465 #endif /* CONFIG_DEBUG_FS */
5467 static int __init regulator_init(void)
5471 ret = class_register(®ulator_class);
5473 debugfs_root = debugfs_create_dir("regulator", NULL);
5475 pr_warn("regulator: Failed to create debugfs directory\n");
5477 #ifdef CONFIG_DEBUG_FS
5478 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
5481 debugfs_create_file("regulator_summary", 0444, debugfs_root,
5482 NULL, ®ulator_summary_fops);
5484 regulator_dummy_init();
5489 /* init early to allow our consumers to complete system booting */
5490 core_initcall(regulator_init);
5492 static int __init regulator_late_cleanup(struct device *dev, void *data)
5494 struct regulator_dev *rdev = dev_to_rdev(dev);
5495 const struct regulator_ops *ops = rdev->desc->ops;
5496 struct regulation_constraints *c = rdev->constraints;
5499 if (c && c->always_on)
5502 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS))
5505 regulator_lock(rdev);
5507 if (rdev->use_count)
5510 /* If we can't read the status assume it's on. */
5511 if (ops->is_enabled)
5512 enabled = ops->is_enabled(rdev);
5519 if (have_full_constraints()) {
5520 /* We log since this may kill the system if it goes
5522 rdev_info(rdev, "disabling\n");
5523 ret = _regulator_do_disable(rdev);
5525 rdev_err(rdev, "couldn't disable: %d\n", ret);
5527 /* The intention is that in future we will
5528 * assume that full constraints are provided
5529 * so warn even if we aren't going to do
5532 rdev_warn(rdev, "incomplete constraints, leaving on\n");
5536 regulator_unlock(rdev);
5541 static int __init regulator_init_complete(void)
5544 * Since DT doesn't provide an idiomatic mechanism for
5545 * enabling full constraints and since it's much more natural
5546 * with DT to provide them just assume that a DT enabled
5547 * system has full constraints.
5549 if (of_have_populated_dt())
5550 has_full_constraints = true;
5553 * Regulators may had failed to resolve their input supplies
5554 * when were registered, either because the input supply was
5555 * not registered yet or because its parent device was not
5556 * bound yet. So attempt to resolve the input supplies for
5557 * pending regulators before trying to disable unused ones.
5559 class_for_each_device(®ulator_class, NULL, NULL,
5560 regulator_register_resolve_supply);
5562 /* If we have a full configuration then disable any regulators
5563 * we have permission to change the status for and which are
5564 * not in use or always_on. This is effectively the default
5565 * for DT and ACPI as they have full constraints.
5567 class_for_each_device(®ulator_class, NULL, NULL,
5568 regulator_late_cleanup);
5572 late_initcall_sync(regulator_init_complete);