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 drms_uA_update(rdev);
1345 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1346 && ops->set_ramp_delay) {
1347 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1349 rdev_err(rdev, "failed to set ramp_delay\n");
1354 if (rdev->constraints->pull_down && ops->set_pull_down) {
1355 ret = ops->set_pull_down(rdev);
1357 rdev_err(rdev, "failed to set pull down\n");
1362 if (rdev->constraints->soft_start && ops->set_soft_start) {
1363 ret = ops->set_soft_start(rdev);
1365 rdev_err(rdev, "failed to set soft start\n");
1370 if (rdev->constraints->over_current_protection
1371 && ops->set_over_current_protection) {
1372 ret = ops->set_over_current_protection(rdev);
1374 rdev_err(rdev, "failed to set over current protection\n");
1379 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1380 bool ad_state = (rdev->constraints->active_discharge ==
1381 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1383 ret = ops->set_active_discharge(rdev, ad_state);
1385 rdev_err(rdev, "failed to set active discharge\n");
1390 /* If the constraints say the regulator should be on at this point
1391 * and we have control then make sure it is enabled.
1393 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1395 ret = regulator_enable(rdev->supply);
1397 _regulator_put(rdev->supply);
1398 rdev->supply = NULL;
1403 ret = _regulator_do_enable(rdev);
1404 if (ret < 0 && ret != -EINVAL) {
1405 rdev_err(rdev, "failed to enable\n");
1411 print_constraints(rdev);
1416 * set_supply - set regulator supply regulator
1417 * @rdev: regulator name
1418 * @supply_rdev: supply regulator name
1420 * Called by platform initialisation code to set the supply regulator for this
1421 * regulator. This ensures that a regulators supply will also be enabled by the
1422 * core if it's child is enabled.
1424 static int set_supply(struct regulator_dev *rdev,
1425 struct regulator_dev *supply_rdev)
1429 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1431 if (!try_module_get(supply_rdev->owner))
1434 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1435 if (rdev->supply == NULL) {
1439 supply_rdev->open_count++;
1445 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1446 * @rdev: regulator source
1447 * @consumer_dev_name: dev_name() string for device supply applies to
1448 * @supply: symbolic name for supply
1450 * Allows platform initialisation code to map physical regulator
1451 * sources to symbolic names for supplies for use by devices. Devices
1452 * should use these symbolic names to request regulators, avoiding the
1453 * need to provide board-specific regulator names as platform data.
1455 static int set_consumer_device_supply(struct regulator_dev *rdev,
1456 const char *consumer_dev_name,
1459 struct regulator_map *node;
1465 if (consumer_dev_name != NULL)
1470 list_for_each_entry(node, ®ulator_map_list, list) {
1471 if (node->dev_name && consumer_dev_name) {
1472 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1474 } else if (node->dev_name || consumer_dev_name) {
1478 if (strcmp(node->supply, supply) != 0)
1481 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1483 dev_name(&node->regulator->dev),
1484 node->regulator->desc->name,
1486 dev_name(&rdev->dev), rdev_get_name(rdev));
1490 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1494 node->regulator = rdev;
1495 node->supply = supply;
1498 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1499 if (node->dev_name == NULL) {
1505 list_add(&node->list, ®ulator_map_list);
1509 static void unset_regulator_supplies(struct regulator_dev *rdev)
1511 struct regulator_map *node, *n;
1513 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1514 if (rdev == node->regulator) {
1515 list_del(&node->list);
1516 kfree(node->dev_name);
1522 #ifdef CONFIG_DEBUG_FS
1523 static ssize_t constraint_flags_read_file(struct file *file,
1524 char __user *user_buf,
1525 size_t count, loff_t *ppos)
1527 const struct regulator *regulator = file->private_data;
1528 const struct regulation_constraints *c = regulator->rdev->constraints;
1535 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1539 ret = snprintf(buf, PAGE_SIZE,
1543 "ramp_disable: %u\n"
1546 "over_current_protection: %u\n",
1553 c->over_current_protection);
1555 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1563 static const struct file_operations constraint_flags_fops = {
1564 #ifdef CONFIG_DEBUG_FS
1565 .open = simple_open,
1566 .read = constraint_flags_read_file,
1567 .llseek = default_llseek,
1571 #define REG_STR_SIZE 64
1573 static struct regulator *create_regulator(struct regulator_dev *rdev,
1575 const char *supply_name)
1577 struct regulator *regulator;
1578 char buf[REG_STR_SIZE];
1581 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1582 if (regulator == NULL)
1585 regulator_lock(rdev);
1586 regulator->rdev = rdev;
1587 list_add(®ulator->list, &rdev->consumer_list);
1590 regulator->dev = dev;
1592 /* Add a link to the device sysfs entry */
1593 size = snprintf(buf, REG_STR_SIZE, "%s-%s",
1594 dev->kobj.name, supply_name);
1595 if (size >= REG_STR_SIZE)
1598 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1599 if (regulator->supply_name == NULL)
1602 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1605 rdev_dbg(rdev, "could not add device link %s err %d\n",
1606 dev->kobj.name, err);
1610 regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL);
1611 if (regulator->supply_name == NULL)
1615 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1617 if (!regulator->debugfs) {
1618 rdev_dbg(rdev, "Failed to create debugfs directory\n");
1620 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1621 ®ulator->uA_load);
1622 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1623 ®ulator->voltage[PM_SUSPEND_ON].min_uV);
1624 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1625 ®ulator->voltage[PM_SUSPEND_ON].max_uV);
1626 debugfs_create_file("constraint_flags", 0444,
1627 regulator->debugfs, regulator,
1628 &constraint_flags_fops);
1632 * Check now if the regulator is an always on regulator - if
1633 * it is then we don't need to do nearly so much work for
1634 * enable/disable calls.
1636 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) &&
1637 _regulator_is_enabled(rdev))
1638 regulator->always_on = true;
1640 regulator_unlock(rdev);
1643 list_del(®ulator->list);
1645 regulator_unlock(rdev);
1649 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1651 if (rdev->constraints && rdev->constraints->enable_time)
1652 return rdev->constraints->enable_time;
1653 if (rdev->desc->ops->enable_time)
1654 return rdev->desc->ops->enable_time(rdev);
1655 return rdev->desc->enable_time;
1658 static struct regulator_supply_alias *regulator_find_supply_alias(
1659 struct device *dev, const char *supply)
1661 struct regulator_supply_alias *map;
1663 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1664 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1670 static void regulator_supply_alias(struct device **dev, const char **supply)
1672 struct regulator_supply_alias *map;
1674 map = regulator_find_supply_alias(*dev, *supply);
1676 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1677 *supply, map->alias_supply,
1678 dev_name(map->alias_dev));
1679 *dev = map->alias_dev;
1680 *supply = map->alias_supply;
1684 static int regulator_match(struct device *dev, const void *data)
1686 struct regulator_dev *r = dev_to_rdev(dev);
1688 return strcmp(rdev_get_name(r), data) == 0;
1691 static struct regulator_dev *regulator_lookup_by_name(const char *name)
1695 dev = class_find_device(®ulator_class, NULL, name, regulator_match);
1697 return dev ? dev_to_rdev(dev) : NULL;
1701 * regulator_dev_lookup - lookup a regulator device.
1702 * @dev: device for regulator "consumer".
1703 * @supply: Supply name or regulator ID.
1705 * If successful, returns a struct regulator_dev that corresponds to the name
1706 * @supply and with the embedded struct device refcount incremented by one.
1707 * The refcount must be dropped by calling put_device().
1708 * On failure one of the following ERR-PTR-encoded values is returned:
1709 * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
1712 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1715 struct regulator_dev *r = NULL;
1716 struct device_node *node;
1717 struct regulator_map *map;
1718 const char *devname = NULL;
1720 regulator_supply_alias(&dev, &supply);
1722 /* first do a dt based lookup */
1723 if (dev && dev->of_node) {
1724 node = of_get_regulator(dev, supply);
1726 r = of_find_regulator_by_node(node);
1731 * We have a node, but there is no device.
1732 * assume it has not registered yet.
1734 return ERR_PTR(-EPROBE_DEFER);
1738 /* if not found, try doing it non-dt way */
1740 devname = dev_name(dev);
1742 mutex_lock(®ulator_list_mutex);
1743 list_for_each_entry(map, ®ulator_map_list, list) {
1744 /* If the mapping has a device set up it must match */
1745 if (map->dev_name &&
1746 (!devname || strcmp(map->dev_name, devname)))
1749 if (strcmp(map->supply, supply) == 0 &&
1750 get_device(&map->regulator->dev)) {
1755 mutex_unlock(®ulator_list_mutex);
1760 r = regulator_lookup_by_name(supply);
1764 return ERR_PTR(-ENODEV);
1767 static int regulator_resolve_supply(struct regulator_dev *rdev)
1769 struct regulator_dev *r;
1770 struct device *dev = rdev->dev.parent;
1773 /* No supply to resolve? */
1774 if (!rdev->supply_name)
1777 /* Supply already resolved? */
1781 r = regulator_dev_lookup(dev, rdev->supply_name);
1785 /* Did the lookup explicitly defer for us? */
1786 if (ret == -EPROBE_DEFER)
1789 if (have_full_constraints()) {
1790 r = dummy_regulator_rdev;
1791 get_device(&r->dev);
1793 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1794 rdev->supply_name, rdev->desc->name);
1795 return -EPROBE_DEFER;
1800 * If the supply's parent device is not the same as the
1801 * regulator's parent device, then ensure the parent device
1802 * is bound before we resolve the supply, in case the parent
1803 * device get probe deferred and unregisters the supply.
1805 if (r->dev.parent && r->dev.parent != rdev->dev.parent) {
1806 if (!device_is_bound(r->dev.parent)) {
1807 put_device(&r->dev);
1808 return -EPROBE_DEFER;
1812 /* Recursively resolve the supply of the supply */
1813 ret = regulator_resolve_supply(r);
1815 put_device(&r->dev);
1819 ret = set_supply(rdev, r);
1821 put_device(&r->dev);
1826 * In set_machine_constraints() we may have turned this regulator on
1827 * but we couldn't propagate to the supply if it hadn't been resolved
1830 if (rdev->use_count) {
1831 ret = regulator_enable(rdev->supply);
1833 _regulator_put(rdev->supply);
1834 rdev->supply = NULL;
1842 /* Internal regulator request function */
1843 struct regulator *_regulator_get(struct device *dev, const char *id,
1844 enum regulator_get_type get_type)
1846 struct regulator_dev *rdev;
1847 struct regulator *regulator;
1848 const char *devname = dev ? dev_name(dev) : "deviceless";
1851 if (get_type >= MAX_GET_TYPE) {
1852 dev_err(dev, "invalid type %d in %s\n", get_type, __func__);
1853 return ERR_PTR(-EINVAL);
1857 pr_err("get() with no identifier\n");
1858 return ERR_PTR(-EINVAL);
1861 rdev = regulator_dev_lookup(dev, id);
1863 ret = PTR_ERR(rdev);
1866 * If regulator_dev_lookup() fails with error other
1867 * than -ENODEV our job here is done, we simply return it.
1870 return ERR_PTR(ret);
1872 if (!have_full_constraints()) {
1874 "incomplete constraints, dummy supplies not allowed\n");
1875 return ERR_PTR(-ENODEV);
1881 * Assume that a regulator is physically present and
1882 * enabled, even if it isn't hooked up, and just
1886 "%s supply %s not found, using dummy regulator\n",
1888 rdev = dummy_regulator_rdev;
1889 get_device(&rdev->dev);
1894 "dummy supplies not allowed for exclusive requests\n");
1898 return ERR_PTR(-ENODEV);
1902 if (rdev->exclusive) {
1903 regulator = ERR_PTR(-EPERM);
1904 put_device(&rdev->dev);
1908 if (get_type == EXCLUSIVE_GET && rdev->open_count) {
1909 regulator = ERR_PTR(-EBUSY);
1910 put_device(&rdev->dev);
1914 mutex_lock(®ulator_list_mutex);
1915 ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled);
1916 mutex_unlock(®ulator_list_mutex);
1919 regulator = ERR_PTR(-EPROBE_DEFER);
1920 put_device(&rdev->dev);
1924 ret = regulator_resolve_supply(rdev);
1926 regulator = ERR_PTR(ret);
1927 put_device(&rdev->dev);
1931 if (!try_module_get(rdev->owner)) {
1932 regulator = ERR_PTR(-EPROBE_DEFER);
1933 put_device(&rdev->dev);
1937 regulator = create_regulator(rdev, dev, id);
1938 if (regulator == NULL) {
1939 regulator = ERR_PTR(-ENOMEM);
1940 put_device(&rdev->dev);
1941 module_put(rdev->owner);
1946 if (get_type == EXCLUSIVE_GET) {
1947 rdev->exclusive = 1;
1949 ret = _regulator_is_enabled(rdev);
1951 rdev->use_count = 1;
1953 rdev->use_count = 0;
1956 device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS);
1962 * regulator_get - lookup and obtain a reference to a regulator.
1963 * @dev: device for regulator "consumer"
1964 * @id: Supply name or regulator ID.
1966 * Returns a struct regulator corresponding to the regulator producer,
1967 * or IS_ERR() condition containing errno.
1969 * Use of supply names configured via regulator_set_device_supply() is
1970 * strongly encouraged. It is recommended that the supply name used
1971 * should match the name used for the supply and/or the relevant
1972 * device pins in the datasheet.
1974 struct regulator *regulator_get(struct device *dev, const char *id)
1976 return _regulator_get(dev, id, NORMAL_GET);
1978 EXPORT_SYMBOL_GPL(regulator_get);
1981 * regulator_get_exclusive - obtain exclusive access to a regulator.
1982 * @dev: device for regulator "consumer"
1983 * @id: Supply name or regulator ID.
1985 * Returns a struct regulator corresponding to the regulator producer,
1986 * or IS_ERR() condition containing errno. Other consumers will be
1987 * unable to obtain this regulator while this reference is held and the
1988 * use count for the regulator will be initialised to reflect the current
1989 * state of the regulator.
1991 * This is intended for use by consumers which cannot tolerate shared
1992 * use of the regulator such as those which need to force the
1993 * regulator off for correct operation of the hardware they are
1996 * Use of supply names configured via regulator_set_device_supply() is
1997 * strongly encouraged. It is recommended that the supply name used
1998 * should match the name used for the supply and/or the relevant
1999 * device pins in the datasheet.
2001 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
2003 return _regulator_get(dev, id, EXCLUSIVE_GET);
2005 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
2008 * regulator_get_optional - obtain optional access to a regulator.
2009 * @dev: device for regulator "consumer"
2010 * @id: Supply name or regulator ID.
2012 * Returns a struct regulator corresponding to the regulator producer,
2013 * or IS_ERR() condition containing errno.
2015 * This is intended for use by consumers for devices which can have
2016 * some supplies unconnected in normal use, such as some MMC devices.
2017 * It can allow the regulator core to provide stub supplies for other
2018 * supplies requested using normal regulator_get() calls without
2019 * disrupting the operation of drivers that can handle absent
2022 * Use of supply names configured via regulator_set_device_supply() is
2023 * strongly encouraged. It is recommended that the supply name used
2024 * should match the name used for the supply and/or the relevant
2025 * device pins in the datasheet.
2027 struct regulator *regulator_get_optional(struct device *dev, const char *id)
2029 return _regulator_get(dev, id, OPTIONAL_GET);
2031 EXPORT_SYMBOL_GPL(regulator_get_optional);
2033 /* regulator_list_mutex lock held by regulator_put() */
2034 static void _regulator_put(struct regulator *regulator)
2036 struct regulator_dev *rdev;
2038 if (IS_ERR_OR_NULL(regulator))
2041 lockdep_assert_held_once(®ulator_list_mutex);
2043 /* Docs say you must disable before calling regulator_put() */
2044 WARN_ON(regulator->enable_count);
2046 rdev = regulator->rdev;
2048 debugfs_remove_recursive(regulator->debugfs);
2050 if (regulator->dev) {
2051 device_link_remove(regulator->dev, &rdev->dev);
2053 /* remove any sysfs entries */
2054 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
2057 regulator_lock(rdev);
2058 list_del(®ulator->list);
2061 rdev->exclusive = 0;
2062 put_device(&rdev->dev);
2063 regulator_unlock(rdev);
2065 kfree_const(regulator->supply_name);
2068 module_put(rdev->owner);
2072 * regulator_put - "free" the regulator source
2073 * @regulator: regulator source
2075 * Note: drivers must ensure that all regulator_enable calls made on this
2076 * regulator source are balanced by regulator_disable calls prior to calling
2079 void regulator_put(struct regulator *regulator)
2081 mutex_lock(®ulator_list_mutex);
2082 _regulator_put(regulator);
2083 mutex_unlock(®ulator_list_mutex);
2085 EXPORT_SYMBOL_GPL(regulator_put);
2088 * regulator_register_supply_alias - Provide device alias for supply lookup
2090 * @dev: device that will be given as the regulator "consumer"
2091 * @id: Supply name or regulator ID
2092 * @alias_dev: device that should be used to lookup the supply
2093 * @alias_id: Supply name or regulator ID that should be used to lookup the
2096 * All lookups for id on dev will instead be conducted for alias_id on
2099 int regulator_register_supply_alias(struct device *dev, const char *id,
2100 struct device *alias_dev,
2101 const char *alias_id)
2103 struct regulator_supply_alias *map;
2105 map = regulator_find_supply_alias(dev, id);
2109 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
2114 map->src_supply = id;
2115 map->alias_dev = alias_dev;
2116 map->alias_supply = alias_id;
2118 list_add(&map->list, ®ulator_supply_alias_list);
2120 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
2121 id, dev_name(dev), alias_id, dev_name(alias_dev));
2125 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
2128 * regulator_unregister_supply_alias - Remove device alias
2130 * @dev: device that will be given as the regulator "consumer"
2131 * @id: Supply name or regulator ID
2133 * Remove a lookup alias if one exists for id on dev.
2135 void regulator_unregister_supply_alias(struct device *dev, const char *id)
2137 struct regulator_supply_alias *map;
2139 map = regulator_find_supply_alias(dev, id);
2141 list_del(&map->list);
2145 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
2148 * regulator_bulk_register_supply_alias - register multiple aliases
2150 * @dev: device that will be given as the regulator "consumer"
2151 * @id: List of supply names or regulator IDs
2152 * @alias_dev: device that should be used to lookup the supply
2153 * @alias_id: List of supply names or regulator IDs that should be used to
2155 * @num_id: Number of aliases to register
2157 * @return 0 on success, an errno on failure.
2159 * This helper function allows drivers to register several supply
2160 * aliases in one operation. If any of the aliases cannot be
2161 * registered any aliases that were registered will be removed
2162 * before returning to the caller.
2164 int regulator_bulk_register_supply_alias(struct device *dev,
2165 const char *const *id,
2166 struct device *alias_dev,
2167 const char *const *alias_id,
2173 for (i = 0; i < num_id; ++i) {
2174 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
2184 "Failed to create supply alias %s,%s -> %s,%s\n",
2185 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
2188 regulator_unregister_supply_alias(dev, id[i]);
2192 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
2195 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
2197 * @dev: device that will be given as the regulator "consumer"
2198 * @id: List of supply names or regulator IDs
2199 * @num_id: Number of aliases to unregister
2201 * This helper function allows drivers to unregister several supply
2202 * aliases in one operation.
2204 void regulator_bulk_unregister_supply_alias(struct device *dev,
2205 const char *const *id,
2210 for (i = 0; i < num_id; ++i)
2211 regulator_unregister_supply_alias(dev, id[i]);
2213 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
2216 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
2217 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
2218 const struct regulator_config *config)
2220 struct regulator_enable_gpio *pin;
2221 struct gpio_desc *gpiod;
2223 gpiod = config->ena_gpiod;
2225 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
2226 if (pin->gpiod == gpiod) {
2227 rdev_dbg(rdev, "GPIO is already used\n");
2228 goto update_ena_gpio_to_rdev;
2232 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
2237 list_add(&pin->list, ®ulator_ena_gpio_list);
2239 update_ena_gpio_to_rdev:
2240 pin->request_count++;
2241 rdev->ena_pin = pin;
2245 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
2247 struct regulator_enable_gpio *pin, *n;
2252 /* Free the GPIO only in case of no use */
2253 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
2254 if (pin->gpiod == rdev->ena_pin->gpiod) {
2255 if (pin->request_count <= 1) {
2256 pin->request_count = 0;
2257 gpiod_put(pin->gpiod);
2258 list_del(&pin->list);
2260 rdev->ena_pin = NULL;
2263 pin->request_count--;
2270 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
2271 * @rdev: regulator_dev structure
2272 * @enable: enable GPIO at initial use?
2274 * GPIO is enabled in case of initial use. (enable_count is 0)
2275 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2277 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
2279 struct regulator_enable_gpio *pin = rdev->ena_pin;
2285 /* Enable GPIO at initial use */
2286 if (pin->enable_count == 0)
2287 gpiod_set_value_cansleep(pin->gpiod, 1);
2289 pin->enable_count++;
2291 if (pin->enable_count > 1) {
2292 pin->enable_count--;
2296 /* Disable GPIO if not used */
2297 if (pin->enable_count <= 1) {
2298 gpiod_set_value_cansleep(pin->gpiod, 0);
2299 pin->enable_count = 0;
2307 * _regulator_enable_delay - a delay helper function
2308 * @delay: time to delay in microseconds
2310 * Delay for the requested amount of time as per the guidelines in:
2312 * Documentation/timers/timers-howto.txt
2314 * The assumption here is that regulators will never be enabled in
2315 * atomic context and therefore sleeping functions can be used.
2317 static void _regulator_enable_delay(unsigned int delay)
2319 unsigned int ms = delay / 1000;
2320 unsigned int us = delay % 1000;
2324 * For small enough values, handle super-millisecond
2325 * delays in the usleep_range() call below.
2334 * Give the scheduler some room to coalesce with any other
2335 * wakeup sources. For delays shorter than 10 us, don't even
2336 * bother setting up high-resolution timers and just busy-
2340 usleep_range(us, us + 100);
2345 static int _regulator_do_enable(struct regulator_dev *rdev)
2349 /* Query before enabling in case configuration dependent. */
2350 ret = _regulator_get_enable_time(rdev);
2354 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2358 trace_regulator_enable(rdev_get_name(rdev));
2360 if (rdev->desc->off_on_delay) {
2361 /* if needed, keep a distance of off_on_delay from last time
2362 * this regulator was disabled.
2364 unsigned long start_jiffy = jiffies;
2365 unsigned long intended, max_delay, remaining;
2367 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2368 intended = rdev->last_off_jiffy + max_delay;
2370 if (time_before(start_jiffy, intended)) {
2371 /* calc remaining jiffies to deal with one-time
2373 * in case of multiple timer wrapping, either it can be
2374 * detected by out-of-range remaining, or it cannot be
2375 * detected and we get a penalty of
2376 * _regulator_enable_delay().
2378 remaining = intended - start_jiffy;
2379 if (remaining <= max_delay)
2380 _regulator_enable_delay(
2381 jiffies_to_usecs(remaining));
2385 if (rdev->ena_pin) {
2386 if (!rdev->ena_gpio_state) {
2387 ret = regulator_ena_gpio_ctrl(rdev, true);
2390 rdev->ena_gpio_state = 1;
2392 } else if (rdev->desc->ops->enable) {
2393 ret = rdev->desc->ops->enable(rdev);
2400 /* Allow the regulator to ramp; it would be useful to extend
2401 * this for bulk operations so that the regulators can ramp
2403 trace_regulator_enable_delay(rdev_get_name(rdev));
2405 _regulator_enable_delay(delay);
2407 trace_regulator_enable_complete(rdev_get_name(rdev));
2413 * _regulator_handle_consumer_enable - handle that a consumer enabled
2414 * @regulator: regulator source
2416 * Some things on a regulator consumer (like the contribution towards total
2417 * load on the regulator) only have an effect when the consumer wants the
2418 * regulator enabled. Explained in example with two consumers of the same
2420 * consumer A: set_load(100); => total load = 0
2421 * consumer A: regulator_enable(); => total load = 100
2422 * consumer B: set_load(1000); => total load = 100
2423 * consumer B: regulator_enable(); => total load = 1100
2424 * consumer A: regulator_disable(); => total_load = 1000
2426 * This function (together with _regulator_handle_consumer_disable) is
2427 * responsible for keeping track of the refcount for a given regulator consumer
2428 * and applying / unapplying these things.
2430 * Returns 0 upon no error; -error upon error.
2432 static int _regulator_handle_consumer_enable(struct regulator *regulator)
2434 struct regulator_dev *rdev = regulator->rdev;
2436 lockdep_assert_held_once(&rdev->mutex.base);
2438 regulator->enable_count++;
2439 if (regulator->uA_load && regulator->enable_count == 1)
2440 return drms_uA_update(rdev);
2446 * _regulator_handle_consumer_disable - handle that a consumer disabled
2447 * @regulator: regulator source
2449 * The opposite of _regulator_handle_consumer_enable().
2451 * Returns 0 upon no error; -error upon error.
2453 static int _regulator_handle_consumer_disable(struct regulator *regulator)
2455 struct regulator_dev *rdev = regulator->rdev;
2457 lockdep_assert_held_once(&rdev->mutex.base);
2459 if (!regulator->enable_count) {
2460 rdev_err(rdev, "Underflow of regulator enable count\n");
2464 regulator->enable_count--;
2465 if (regulator->uA_load && regulator->enable_count == 0)
2466 return drms_uA_update(rdev);
2471 /* locks held by regulator_enable() */
2472 static int _regulator_enable(struct regulator *regulator)
2474 struct regulator_dev *rdev = regulator->rdev;
2477 lockdep_assert_held_once(&rdev->mutex.base);
2479 if (rdev->use_count == 0 && rdev->supply) {
2480 ret = _regulator_enable(rdev->supply);
2485 /* balance only if there are regulators coupled */
2486 if (rdev->coupling_desc.n_coupled > 1) {
2487 ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
2489 goto err_disable_supply;
2492 ret = _regulator_handle_consumer_enable(regulator);
2494 goto err_disable_supply;
2496 if (rdev->use_count == 0) {
2497 /* The regulator may on if it's not switchable or left on */
2498 ret = _regulator_is_enabled(rdev);
2499 if (ret == -EINVAL || ret == 0) {
2500 if (!regulator_ops_is_valid(rdev,
2501 REGULATOR_CHANGE_STATUS)) {
2503 goto err_consumer_disable;
2506 ret = _regulator_do_enable(rdev);
2508 goto err_consumer_disable;
2510 _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE,
2512 } else if (ret < 0) {
2513 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
2514 goto err_consumer_disable;
2516 /* Fallthrough on positive return values - already enabled */
2523 err_consumer_disable:
2524 _regulator_handle_consumer_disable(regulator);
2527 if (rdev->use_count == 0 && rdev->supply)
2528 _regulator_disable(rdev->supply);
2534 * regulator_enable - enable regulator output
2535 * @regulator: regulator source
2537 * Request that the regulator be enabled with the regulator output at
2538 * the predefined voltage or current value. Calls to regulator_enable()
2539 * must be balanced with calls to regulator_disable().
2541 * NOTE: the output value can be set by other drivers, boot loader or may be
2542 * hardwired in the regulator.
2544 int regulator_enable(struct regulator *regulator)
2546 struct regulator_dev *rdev = regulator->rdev;
2547 struct ww_acquire_ctx ww_ctx;
2550 regulator_lock_dependent(rdev, &ww_ctx);
2551 ret = _regulator_enable(regulator);
2552 regulator_unlock_dependent(rdev, &ww_ctx);
2556 EXPORT_SYMBOL_GPL(regulator_enable);
2558 static int _regulator_do_disable(struct regulator_dev *rdev)
2562 trace_regulator_disable(rdev_get_name(rdev));
2564 if (rdev->ena_pin) {
2565 if (rdev->ena_gpio_state) {
2566 ret = regulator_ena_gpio_ctrl(rdev, false);
2569 rdev->ena_gpio_state = 0;
2572 } else if (rdev->desc->ops->disable) {
2573 ret = rdev->desc->ops->disable(rdev);
2578 /* cares about last_off_jiffy only if off_on_delay is required by
2581 if (rdev->desc->off_on_delay)
2582 rdev->last_off_jiffy = jiffies;
2584 trace_regulator_disable_complete(rdev_get_name(rdev));
2589 /* locks held by regulator_disable() */
2590 static int _regulator_disable(struct regulator *regulator)
2592 struct regulator_dev *rdev = regulator->rdev;
2595 lockdep_assert_held_once(&rdev->mutex.base);
2597 if (WARN(rdev->use_count <= 0,
2598 "unbalanced disables for %s\n", rdev_get_name(rdev)))
2601 /* are we the last user and permitted to disable ? */
2602 if (rdev->use_count == 1 &&
2603 (rdev->constraints && !rdev->constraints->always_on)) {
2605 /* we are last user */
2606 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
2607 ret = _notifier_call_chain(rdev,
2608 REGULATOR_EVENT_PRE_DISABLE,
2610 if (ret & NOTIFY_STOP_MASK)
2613 ret = _regulator_do_disable(rdev);
2615 rdev_err(rdev, "failed to disable\n");
2616 _notifier_call_chain(rdev,
2617 REGULATOR_EVENT_ABORT_DISABLE,
2621 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2625 rdev->use_count = 0;
2626 } else if (rdev->use_count > 1) {
2631 ret = _regulator_handle_consumer_disable(regulator);
2633 if (ret == 0 && rdev->coupling_desc.n_coupled > 1)
2634 ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
2636 if (ret == 0 && rdev->use_count == 0 && rdev->supply)
2637 ret = _regulator_disable(rdev->supply);
2643 * regulator_disable - disable regulator output
2644 * @regulator: regulator source
2646 * Disable the regulator output voltage or current. Calls to
2647 * regulator_enable() must be balanced with calls to
2648 * regulator_disable().
2650 * NOTE: this will only disable the regulator output if no other consumer
2651 * devices have it enabled, the regulator device supports disabling and
2652 * machine constraints permit this operation.
2654 int regulator_disable(struct regulator *regulator)
2656 struct regulator_dev *rdev = regulator->rdev;
2657 struct ww_acquire_ctx ww_ctx;
2660 regulator_lock_dependent(rdev, &ww_ctx);
2661 ret = _regulator_disable(regulator);
2662 regulator_unlock_dependent(rdev, &ww_ctx);
2666 EXPORT_SYMBOL_GPL(regulator_disable);
2668 /* locks held by regulator_force_disable() */
2669 static int _regulator_force_disable(struct regulator_dev *rdev)
2673 lockdep_assert_held_once(&rdev->mutex.base);
2675 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2676 REGULATOR_EVENT_PRE_DISABLE, NULL);
2677 if (ret & NOTIFY_STOP_MASK)
2680 ret = _regulator_do_disable(rdev);
2682 rdev_err(rdev, "failed to force disable\n");
2683 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2684 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2688 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2689 REGULATOR_EVENT_DISABLE, NULL);
2695 * regulator_force_disable - force disable regulator output
2696 * @regulator: regulator source
2698 * Forcibly disable the regulator output voltage or current.
2699 * NOTE: this *will* disable the regulator output even if other consumer
2700 * devices have it enabled. This should be used for situations when device
2701 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2703 int regulator_force_disable(struct regulator *regulator)
2705 struct regulator_dev *rdev = regulator->rdev;
2706 struct ww_acquire_ctx ww_ctx;
2709 regulator_lock_dependent(rdev, &ww_ctx);
2711 ret = _regulator_force_disable(regulator->rdev);
2713 if (rdev->coupling_desc.n_coupled > 1)
2714 regulator_balance_voltage(rdev, PM_SUSPEND_ON);
2716 if (regulator->uA_load) {
2717 regulator->uA_load = 0;
2718 ret = drms_uA_update(rdev);
2721 if (rdev->use_count != 0 && rdev->supply)
2722 _regulator_disable(rdev->supply);
2724 regulator_unlock_dependent(rdev, &ww_ctx);
2728 EXPORT_SYMBOL_GPL(regulator_force_disable);
2730 static void regulator_disable_work(struct work_struct *work)
2732 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2734 struct ww_acquire_ctx ww_ctx;
2736 struct regulator *regulator;
2737 int total_count = 0;
2739 regulator_lock_dependent(rdev, &ww_ctx);
2742 * Workqueue functions queue the new work instance while the previous
2743 * work instance is being processed. Cancel the queued work instance
2744 * as the work instance under processing does the job of the queued
2747 cancel_delayed_work(&rdev->disable_work);
2749 list_for_each_entry(regulator, &rdev->consumer_list, list) {
2750 count = regulator->deferred_disables;
2755 total_count += count;
2756 regulator->deferred_disables = 0;
2758 for (i = 0; i < count; i++) {
2759 ret = _regulator_disable(regulator);
2761 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2764 WARN_ON(!total_count);
2766 if (rdev->coupling_desc.n_coupled > 1)
2767 regulator_balance_voltage(rdev, PM_SUSPEND_ON);
2769 regulator_unlock_dependent(rdev, &ww_ctx);
2773 * regulator_disable_deferred - disable regulator output with delay
2774 * @regulator: regulator source
2775 * @ms: milliseconds until the regulator is disabled
2777 * Execute regulator_disable() on the regulator after a delay. This
2778 * is intended for use with devices that require some time to quiesce.
2780 * NOTE: this will only disable the regulator output if no other consumer
2781 * devices have it enabled, the regulator device supports disabling and
2782 * machine constraints permit this operation.
2784 int regulator_disable_deferred(struct regulator *regulator, int ms)
2786 struct regulator_dev *rdev = regulator->rdev;
2789 return regulator_disable(regulator);
2791 regulator_lock(rdev);
2792 regulator->deferred_disables++;
2793 mod_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2794 msecs_to_jiffies(ms));
2795 regulator_unlock(rdev);
2799 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2801 static int _regulator_is_enabled(struct regulator_dev *rdev)
2803 /* A GPIO control always takes precedence */
2805 return rdev->ena_gpio_state;
2807 /* If we don't know then assume that the regulator is always on */
2808 if (!rdev->desc->ops->is_enabled)
2811 return rdev->desc->ops->is_enabled(rdev);
2814 static int _regulator_list_voltage(struct regulator_dev *rdev,
2815 unsigned selector, int lock)
2817 const struct regulator_ops *ops = rdev->desc->ops;
2820 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2821 return rdev->desc->fixed_uV;
2823 if (ops->list_voltage) {
2824 if (selector >= rdev->desc->n_voltages)
2827 regulator_lock(rdev);
2828 ret = ops->list_voltage(rdev, selector);
2830 regulator_unlock(rdev);
2831 } else if (rdev->is_switch && rdev->supply) {
2832 ret = _regulator_list_voltage(rdev->supply->rdev,
2839 if (ret < rdev->constraints->min_uV)
2841 else if (ret > rdev->constraints->max_uV)
2849 * regulator_is_enabled - is the regulator output enabled
2850 * @regulator: regulator source
2852 * Returns positive if the regulator driver backing the source/client
2853 * has requested that the device be enabled, zero if it hasn't, else a
2854 * negative errno code.
2856 * Note that the device backing this regulator handle can have multiple
2857 * users, so it might be enabled even if regulator_enable() was never
2858 * called for this particular source.
2860 int regulator_is_enabled(struct regulator *regulator)
2864 if (regulator->always_on)
2867 regulator_lock(regulator->rdev);
2868 ret = _regulator_is_enabled(regulator->rdev);
2869 regulator_unlock(regulator->rdev);
2873 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2876 * regulator_count_voltages - count regulator_list_voltage() selectors
2877 * @regulator: regulator source
2879 * Returns number of selectors, or negative errno. Selectors are
2880 * numbered starting at zero, and typically correspond to bitfields
2881 * in hardware registers.
2883 int regulator_count_voltages(struct regulator *regulator)
2885 struct regulator_dev *rdev = regulator->rdev;
2887 if (rdev->desc->n_voltages)
2888 return rdev->desc->n_voltages;
2890 if (!rdev->is_switch || !rdev->supply)
2893 return regulator_count_voltages(rdev->supply);
2895 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2898 * regulator_list_voltage - enumerate supported voltages
2899 * @regulator: regulator source
2900 * @selector: identify voltage to list
2901 * Context: can sleep
2903 * Returns a voltage that can be passed to @regulator_set_voltage(),
2904 * zero if this selector code can't be used on this system, or a
2907 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2909 return _regulator_list_voltage(regulator->rdev, selector, 1);
2911 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2914 * regulator_get_regmap - get the regulator's register map
2915 * @regulator: regulator source
2917 * Returns the register map for the given regulator, or an ERR_PTR value
2918 * if the regulator doesn't use regmap.
2920 struct regmap *regulator_get_regmap(struct regulator *regulator)
2922 struct regmap *map = regulator->rdev->regmap;
2924 return map ? map : ERR_PTR(-EOPNOTSUPP);
2928 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2929 * @regulator: regulator source
2930 * @vsel_reg: voltage selector register, output parameter
2931 * @vsel_mask: mask for voltage selector bitfield, output parameter
2933 * Returns the hardware register offset and bitmask used for setting the
2934 * regulator voltage. This might be useful when configuring voltage-scaling
2935 * hardware or firmware that can make I2C requests behind the kernel's back,
2938 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2939 * and 0 is returned, otherwise a negative errno is returned.
2941 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2943 unsigned *vsel_mask)
2945 struct regulator_dev *rdev = regulator->rdev;
2946 const struct regulator_ops *ops = rdev->desc->ops;
2948 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2951 *vsel_reg = rdev->desc->vsel_reg;
2952 *vsel_mask = rdev->desc->vsel_mask;
2956 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2959 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2960 * @regulator: regulator source
2961 * @selector: identify voltage to list
2963 * Converts the selector to a hardware-specific voltage selector that can be
2964 * directly written to the regulator registers. The address of the voltage
2965 * register can be determined by calling @regulator_get_hardware_vsel_register.
2967 * On error a negative errno is returned.
2969 int regulator_list_hardware_vsel(struct regulator *regulator,
2972 struct regulator_dev *rdev = regulator->rdev;
2973 const struct regulator_ops *ops = rdev->desc->ops;
2975 if (selector >= rdev->desc->n_voltages)
2977 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2982 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2985 * regulator_get_linear_step - return the voltage step size between VSEL values
2986 * @regulator: regulator source
2988 * Returns the voltage step size between VSEL values for linear
2989 * regulators, or return 0 if the regulator isn't a linear regulator.
2991 unsigned int regulator_get_linear_step(struct regulator *regulator)
2993 struct regulator_dev *rdev = regulator->rdev;
2995 return rdev->desc->uV_step;
2997 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
3000 * regulator_is_supported_voltage - check if a voltage range can be supported
3002 * @regulator: Regulator to check.
3003 * @min_uV: Minimum required voltage in uV.
3004 * @max_uV: Maximum required voltage in uV.
3006 * Returns a boolean.
3008 int regulator_is_supported_voltage(struct regulator *regulator,
3009 int min_uV, int max_uV)
3011 struct regulator_dev *rdev = regulator->rdev;
3012 int i, voltages, ret;
3014 /* If we can't change voltage check the current voltage */
3015 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
3016 ret = regulator_get_voltage(regulator);
3018 return min_uV <= ret && ret <= max_uV;
3023 /* Any voltage within constrains range is fine? */
3024 if (rdev->desc->continuous_voltage_range)
3025 return min_uV >= rdev->constraints->min_uV &&
3026 max_uV <= rdev->constraints->max_uV;
3028 ret = regulator_count_voltages(regulator);
3033 for (i = 0; i < voltages; i++) {
3034 ret = regulator_list_voltage(regulator, i);
3036 if (ret >= min_uV && ret <= max_uV)
3042 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
3044 static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
3047 const struct regulator_desc *desc = rdev->desc;
3049 if (desc->ops->map_voltage)
3050 return desc->ops->map_voltage(rdev, min_uV, max_uV);
3052 if (desc->ops->list_voltage == regulator_list_voltage_linear)
3053 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
3055 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
3056 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
3058 if (desc->ops->list_voltage ==
3059 regulator_list_voltage_pickable_linear_range)
3060 return regulator_map_voltage_pickable_linear_range(rdev,
3063 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
3066 static int _regulator_call_set_voltage(struct regulator_dev *rdev,
3067 int min_uV, int max_uV,
3070 struct pre_voltage_change_data data;
3073 data.old_uV = _regulator_get_voltage(rdev);
3074 data.min_uV = min_uV;
3075 data.max_uV = max_uV;
3076 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
3078 if (ret & NOTIFY_STOP_MASK)
3081 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
3085 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
3086 (void *)data.old_uV);
3091 static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
3092 int uV, unsigned selector)
3094 struct pre_voltage_change_data data;
3097 data.old_uV = _regulator_get_voltage(rdev);
3100 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
3102 if (ret & NOTIFY_STOP_MASK)
3105 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
3109 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
3110 (void *)data.old_uV);
3115 static int _regulator_set_voltage_time(struct regulator_dev *rdev,
3116 int old_uV, int new_uV)
3118 unsigned int ramp_delay = 0;
3120 if (rdev->constraints->ramp_delay)
3121 ramp_delay = rdev->constraints->ramp_delay;
3122 else if (rdev->desc->ramp_delay)
3123 ramp_delay = rdev->desc->ramp_delay;
3124 else if (rdev->constraints->settling_time)
3125 return rdev->constraints->settling_time;
3126 else if (rdev->constraints->settling_time_up &&
3128 return rdev->constraints->settling_time_up;
3129 else if (rdev->constraints->settling_time_down &&
3131 return rdev->constraints->settling_time_down;
3133 if (ramp_delay == 0) {
3134 rdev_dbg(rdev, "ramp_delay not set\n");
3138 return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
3141 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
3142 int min_uV, int max_uV)
3147 unsigned int selector;
3148 int old_selector = -1;
3149 const struct regulator_ops *ops = rdev->desc->ops;
3150 int old_uV = _regulator_get_voltage(rdev);
3152 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
3154 min_uV += rdev->constraints->uV_offset;
3155 max_uV += rdev->constraints->uV_offset;
3158 * If we can't obtain the old selector there is not enough
3159 * info to call set_voltage_time_sel().
3161 if (_regulator_is_enabled(rdev) &&
3162 ops->set_voltage_time_sel && ops->get_voltage_sel) {
3163 old_selector = ops->get_voltage_sel(rdev);
3164 if (old_selector < 0)
3165 return old_selector;
3168 if (ops->set_voltage) {
3169 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
3173 if (ops->list_voltage)
3174 best_val = ops->list_voltage(rdev,
3177 best_val = _regulator_get_voltage(rdev);
3180 } else if (ops->set_voltage_sel) {
3181 ret = regulator_map_voltage(rdev, min_uV, max_uV);
3183 best_val = ops->list_voltage(rdev, ret);
3184 if (min_uV <= best_val && max_uV >= best_val) {
3186 if (old_selector == selector)
3189 ret = _regulator_call_set_voltage_sel(
3190 rdev, best_val, selector);
3202 if (ops->set_voltage_time_sel) {
3204 * Call set_voltage_time_sel if successfully obtained
3207 if (old_selector >= 0 && old_selector != selector)
3208 delay = ops->set_voltage_time_sel(rdev, old_selector,
3211 if (old_uV != best_val) {
3212 if (ops->set_voltage_time)
3213 delay = ops->set_voltage_time(rdev, old_uV,
3216 delay = _regulator_set_voltage_time(rdev,
3223 rdev_warn(rdev, "failed to get delay: %d\n", delay);
3227 /* Insert any necessary delays */
3228 if (delay >= 1000) {
3229 mdelay(delay / 1000);
3230 udelay(delay % 1000);
3235 if (best_val >= 0) {
3236 unsigned long data = best_val;
3238 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
3243 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
3248 static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev,
3249 int min_uV, int max_uV, suspend_state_t state)
3251 struct regulator_state *rstate;
3254 rstate = regulator_get_suspend_state(rdev, state);
3258 if (min_uV < rstate->min_uV)
3259 min_uV = rstate->min_uV;
3260 if (max_uV > rstate->max_uV)
3261 max_uV = rstate->max_uV;
3263 sel = regulator_map_voltage(rdev, min_uV, max_uV);
3267 uV = rdev->desc->ops->list_voltage(rdev, sel);
3268 if (uV >= min_uV && uV <= max_uV)
3274 static int regulator_set_voltage_unlocked(struct regulator *regulator,
3275 int min_uV, int max_uV,
3276 suspend_state_t state)
3278 struct regulator_dev *rdev = regulator->rdev;
3279 struct regulator_voltage *voltage = ®ulator->voltage[state];
3281 int old_min_uV, old_max_uV;
3284 /* If we're setting the same range as last time the change
3285 * should be a noop (some cpufreq implementations use the same
3286 * voltage for multiple frequencies, for example).
3288 if (voltage->min_uV == min_uV && voltage->max_uV == max_uV)
3291 /* If we're trying to set a range that overlaps the current voltage,
3292 * return successfully even though the regulator does not support
3293 * changing the voltage.
3295 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
3296 current_uV = _regulator_get_voltage(rdev);
3297 if (min_uV <= current_uV && current_uV <= max_uV) {
3298 voltage->min_uV = min_uV;
3299 voltage->max_uV = max_uV;
3305 if (!rdev->desc->ops->set_voltage &&
3306 !rdev->desc->ops->set_voltage_sel) {
3311 /* constraints check */
3312 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3316 /* restore original values in case of error */
3317 old_min_uV = voltage->min_uV;
3318 old_max_uV = voltage->max_uV;
3319 voltage->min_uV = min_uV;
3320 voltage->max_uV = max_uV;
3322 /* for not coupled regulators this will just set the voltage */
3323 ret = regulator_balance_voltage(rdev, state);
3325 voltage->min_uV = old_min_uV;
3326 voltage->max_uV = old_max_uV;
3333 static int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV,
3334 int max_uV, suspend_state_t state)
3336 int best_supply_uV = 0;
3337 int supply_change_uV = 0;
3341 regulator_ops_is_valid(rdev->supply->rdev,
3342 REGULATOR_CHANGE_VOLTAGE) &&
3343 (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage ||
3344 rdev->desc->ops->get_voltage_sel))) {
3345 int current_supply_uV;
3348 selector = regulator_map_voltage(rdev, min_uV, max_uV);
3354 best_supply_uV = _regulator_list_voltage(rdev, selector, 0);
3355 if (best_supply_uV < 0) {
3356 ret = best_supply_uV;
3360 best_supply_uV += rdev->desc->min_dropout_uV;
3362 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
3363 if (current_supply_uV < 0) {
3364 ret = current_supply_uV;
3368 supply_change_uV = best_supply_uV - current_supply_uV;
3371 if (supply_change_uV > 0) {
3372 ret = regulator_set_voltage_unlocked(rdev->supply,
3373 best_supply_uV, INT_MAX, state);
3375 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
3381 if (state == PM_SUSPEND_ON)
3382 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3384 ret = _regulator_do_set_suspend_voltage(rdev, min_uV,
3389 if (supply_change_uV < 0) {
3390 ret = regulator_set_voltage_unlocked(rdev->supply,
3391 best_supply_uV, INT_MAX, state);
3393 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
3395 /* No need to fail here */
3403 static int regulator_limit_voltage_step(struct regulator_dev *rdev,
3404 int *current_uV, int *min_uV)
3406 struct regulation_constraints *constraints = rdev->constraints;
3408 /* Limit voltage change only if necessary */
3409 if (!constraints->max_uV_step || !_regulator_is_enabled(rdev))
3412 if (*current_uV < 0) {
3413 *current_uV = _regulator_get_voltage(rdev);
3415 if (*current_uV < 0)
3419 if (abs(*current_uV - *min_uV) <= constraints->max_uV_step)
3422 /* Clamp target voltage within the given step */
3423 if (*current_uV < *min_uV)
3424 *min_uV = min(*current_uV + constraints->max_uV_step,
3427 *min_uV = max(*current_uV - constraints->max_uV_step,
3433 static int regulator_get_optimal_voltage(struct regulator_dev *rdev,
3435 int *min_uV, int *max_uV,
3436 suspend_state_t state,
3439 struct coupling_desc *c_desc = &rdev->coupling_desc;
3440 struct regulator_dev **c_rdevs = c_desc->coupled_rdevs;
3441 struct regulation_constraints *constraints = rdev->constraints;
3442 int max_spread = constraints->max_spread;
3443 int desired_min_uV = 0, desired_max_uV = INT_MAX;
3444 int max_current_uV = 0, min_current_uV = INT_MAX;
3445 int highest_min_uV = 0, target_uV, possible_uV;
3452 * If there are no coupled regulators, simply set the voltage
3453 * demanded by consumers.
3455 if (n_coupled == 1) {
3457 * If consumers don't provide any demands, set voltage
3460 desired_min_uV = constraints->min_uV;
3461 desired_max_uV = constraints->max_uV;
3463 ret = regulator_check_consumers(rdev,
3465 &desired_max_uV, state);
3469 possible_uV = desired_min_uV;
3475 /* Find highest min desired voltage */
3476 for (i = 0; i < n_coupled; i++) {
3478 int tmp_max = INT_MAX;
3480 lockdep_assert_held_once(&c_rdevs[i]->mutex.base);
3482 ret = regulator_check_consumers(c_rdevs[i],
3488 ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max);
3492 highest_min_uV = max(highest_min_uV, tmp_min);
3495 desired_min_uV = tmp_min;
3496 desired_max_uV = tmp_max;
3501 * Let target_uV be equal to the desired one if possible.
3502 * If not, set it to minimum voltage, allowed by other coupled
3505 target_uV = max(desired_min_uV, highest_min_uV - max_spread);
3508 * Find min and max voltages, which currently aren't violating
3511 for (i = 1; i < n_coupled; i++) {
3514 if (!_regulator_is_enabled(c_rdevs[i]))
3517 tmp_act = _regulator_get_voltage(c_rdevs[i]);
3521 min_current_uV = min(tmp_act, min_current_uV);
3522 max_current_uV = max(tmp_act, max_current_uV);
3525 /* There aren't any other regulators enabled */
3526 if (max_current_uV == 0) {
3527 possible_uV = target_uV;
3530 * Correct target voltage, so as it currently isn't
3531 * violating max_spread
3533 possible_uV = max(target_uV, max_current_uV - max_spread);
3534 possible_uV = min(possible_uV, min_current_uV + max_spread);
3537 if (possible_uV > desired_max_uV)
3540 done = (possible_uV == target_uV);
3541 desired_min_uV = possible_uV;
3544 /* Apply max_uV_step constraint if necessary */
3545 if (state == PM_SUSPEND_ON) {
3546 ret = regulator_limit_voltage_step(rdev, current_uV,
3555 /* Set current_uV if wasn't done earlier in the code and if necessary */
3556 if (n_coupled > 1 && *current_uV == -1) {
3558 if (_regulator_is_enabled(rdev)) {
3559 ret = _regulator_get_voltage(rdev);
3565 *current_uV = desired_min_uV;
3569 *min_uV = desired_min_uV;
3570 *max_uV = desired_max_uV;
3575 static int regulator_balance_voltage(struct regulator_dev *rdev,
3576 suspend_state_t state)
3578 struct regulator_dev **c_rdevs;
3579 struct regulator_dev *best_rdev;
3580 struct coupling_desc *c_desc = &rdev->coupling_desc;
3581 int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev;
3582 bool best_c_rdev_done, c_rdev_done[MAX_COUPLED];
3583 unsigned int delta, best_delta;
3585 c_rdevs = c_desc->coupled_rdevs;
3586 n_coupled = c_desc->n_coupled;
3589 * If system is in a state other than PM_SUSPEND_ON, don't check
3590 * other coupled regulators.
3592 if (state != PM_SUSPEND_ON)
3595 if (c_desc->n_resolved < n_coupled) {
3596 rdev_err(rdev, "Not all coupled regulators registered\n");
3600 for (i = 0; i < n_coupled; i++)
3601 c_rdev_done[i] = false;
3604 * Find the best possible voltage change on each loop. Leave the loop
3605 * if there isn't any possible change.
3608 best_c_rdev_done = false;
3616 * Find highest difference between optimal voltage
3617 * and current voltage.
3619 for (i = 0; i < n_coupled; i++) {
3621 * optimal_uV is the best voltage that can be set for
3622 * i-th regulator at the moment without violating
3623 * max_spread constraint in order to balance
3624 * the coupled voltages.
3626 int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0;
3631 ret = regulator_get_optimal_voltage(c_rdevs[i],
3639 delta = abs(optimal_uV - current_uV);
3641 if (delta && best_delta <= delta) {
3642 best_c_rdev_done = ret;
3644 best_rdev = c_rdevs[i];
3645 best_min_uV = optimal_uV;
3646 best_max_uV = optimal_max_uV;
3651 /* Nothing to change, return successfully */
3657 ret = regulator_set_voltage_rdev(best_rdev, best_min_uV,
3658 best_max_uV, state);
3663 c_rdev_done[best_c_rdev] = best_c_rdev_done;
3665 } while (n_coupled > 1);
3672 * regulator_set_voltage - set regulator output voltage
3673 * @regulator: regulator source
3674 * @min_uV: Minimum required voltage in uV
3675 * @max_uV: Maximum acceptable voltage in uV
3677 * Sets a voltage regulator to the desired output voltage. This can be set
3678 * during any regulator state. IOW, regulator can be disabled or enabled.
3680 * If the regulator is enabled then the voltage will change to the new value
3681 * immediately otherwise if the regulator is disabled the regulator will
3682 * output at the new voltage when enabled.
3684 * NOTE: If the regulator is shared between several devices then the lowest
3685 * request voltage that meets the system constraints will be used.
3686 * Regulator system constraints must be set for this regulator before
3687 * calling this function otherwise this call will fail.
3689 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
3691 struct ww_acquire_ctx ww_ctx;
3694 regulator_lock_dependent(regulator->rdev, &ww_ctx);
3696 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV,
3699 regulator_unlock_dependent(regulator->rdev, &ww_ctx);
3703 EXPORT_SYMBOL_GPL(regulator_set_voltage);
3705 static inline int regulator_suspend_toggle(struct regulator_dev *rdev,
3706 suspend_state_t state, bool en)
3708 struct regulator_state *rstate;
3710 rstate = regulator_get_suspend_state(rdev, state);
3714 if (!rstate->changeable)
3717 rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND;
3722 int regulator_suspend_enable(struct regulator_dev *rdev,
3723 suspend_state_t state)
3725 return regulator_suspend_toggle(rdev, state, true);
3727 EXPORT_SYMBOL_GPL(regulator_suspend_enable);
3729 int regulator_suspend_disable(struct regulator_dev *rdev,
3730 suspend_state_t state)
3732 struct regulator *regulator;
3733 struct regulator_voltage *voltage;
3736 * if any consumer wants this regulator device keeping on in
3737 * suspend states, don't set it as disabled.
3739 list_for_each_entry(regulator, &rdev->consumer_list, list) {
3740 voltage = ®ulator->voltage[state];
3741 if (voltage->min_uV || voltage->max_uV)
3745 return regulator_suspend_toggle(rdev, state, false);
3747 EXPORT_SYMBOL_GPL(regulator_suspend_disable);
3749 static int _regulator_set_suspend_voltage(struct regulator *regulator,
3750 int min_uV, int max_uV,
3751 suspend_state_t state)
3753 struct regulator_dev *rdev = regulator->rdev;
3754 struct regulator_state *rstate;
3756 rstate = regulator_get_suspend_state(rdev, state);
3760 if (rstate->min_uV == rstate->max_uV) {
3761 rdev_err(rdev, "The suspend voltage can't be changed!\n");
3765 return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state);
3768 int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV,
3769 int max_uV, suspend_state_t state)
3771 struct ww_acquire_ctx ww_ctx;
3774 /* PM_SUSPEND_ON is handled by regulator_set_voltage() */
3775 if (regulator_check_states(state) || state == PM_SUSPEND_ON)
3778 regulator_lock_dependent(regulator->rdev, &ww_ctx);
3780 ret = _regulator_set_suspend_voltage(regulator, min_uV,
3783 regulator_unlock_dependent(regulator->rdev, &ww_ctx);
3787 EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage);
3790 * regulator_set_voltage_time - get raise/fall time
3791 * @regulator: regulator source
3792 * @old_uV: starting voltage in microvolts
3793 * @new_uV: target voltage in microvolts
3795 * Provided with the starting and ending voltage, this function attempts to
3796 * calculate the time in microseconds required to rise or fall to this new
3799 int regulator_set_voltage_time(struct regulator *regulator,
3800 int old_uV, int new_uV)
3802 struct regulator_dev *rdev = regulator->rdev;
3803 const struct regulator_ops *ops = rdev->desc->ops;
3809 if (ops->set_voltage_time)
3810 return ops->set_voltage_time(rdev, old_uV, new_uV);
3811 else if (!ops->set_voltage_time_sel)
3812 return _regulator_set_voltage_time(rdev, old_uV, new_uV);
3814 /* Currently requires operations to do this */
3815 if (!ops->list_voltage || !rdev->desc->n_voltages)
3818 for (i = 0; i < rdev->desc->n_voltages; i++) {
3819 /* We only look for exact voltage matches here */
3820 voltage = regulator_list_voltage(regulator, i);
3825 if (voltage == old_uV)
3827 if (voltage == new_uV)
3831 if (old_sel < 0 || new_sel < 0)
3834 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3836 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3839 * regulator_set_voltage_time_sel - get raise/fall time
3840 * @rdev: regulator source device
3841 * @old_selector: selector for starting voltage
3842 * @new_selector: selector for target voltage
3844 * Provided with the starting and target voltage selectors, this function
3845 * returns time in microseconds required to rise or fall to this new voltage
3847 * Drivers providing ramp_delay in regulation_constraints can use this as their
3848 * set_voltage_time_sel() operation.
3850 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3851 unsigned int old_selector,
3852 unsigned int new_selector)
3854 int old_volt, new_volt;
3857 if (!rdev->desc->ops->list_voltage)
3860 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3861 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3863 if (rdev->desc->ops->set_voltage_time)
3864 return rdev->desc->ops->set_voltage_time(rdev, old_volt,
3867 return _regulator_set_voltage_time(rdev, old_volt, new_volt);
3869 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
3872 * regulator_sync_voltage - re-apply last regulator output voltage
3873 * @regulator: regulator source
3875 * Re-apply the last configured voltage. This is intended to be used
3876 * where some external control source the consumer is cooperating with
3877 * has caused the configured voltage to change.
3879 int regulator_sync_voltage(struct regulator *regulator)
3881 struct regulator_dev *rdev = regulator->rdev;
3882 struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON];
3883 int ret, min_uV, max_uV;
3885 regulator_lock(rdev);
3887 if (!rdev->desc->ops->set_voltage &&
3888 !rdev->desc->ops->set_voltage_sel) {
3893 /* This is only going to work if we've had a voltage configured. */
3894 if (!voltage->min_uV && !voltage->max_uV) {
3899 min_uV = voltage->min_uV;
3900 max_uV = voltage->max_uV;
3902 /* This should be a paranoia check... */
3903 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3907 ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0);
3911 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3914 regulator_unlock(rdev);
3917 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3919 static int _regulator_get_voltage(struct regulator_dev *rdev)
3924 if (rdev->desc->ops->get_bypass) {
3925 ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
3929 /* if bypassed the regulator must have a supply */
3930 if (!rdev->supply) {
3932 "bypassed regulator has no supply!\n");
3933 return -EPROBE_DEFER;
3936 return _regulator_get_voltage(rdev->supply->rdev);
3940 if (rdev->desc->ops->get_voltage_sel) {
3941 sel = rdev->desc->ops->get_voltage_sel(rdev);
3944 ret = rdev->desc->ops->list_voltage(rdev, sel);
3945 } else if (rdev->desc->ops->get_voltage) {
3946 ret = rdev->desc->ops->get_voltage(rdev);
3947 } else if (rdev->desc->ops->list_voltage) {
3948 ret = rdev->desc->ops->list_voltage(rdev, 0);
3949 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3950 ret = rdev->desc->fixed_uV;
3951 } else if (rdev->supply) {
3952 ret = _regulator_get_voltage(rdev->supply->rdev);
3959 return ret - rdev->constraints->uV_offset;
3963 * regulator_get_voltage - get regulator output voltage
3964 * @regulator: regulator source
3966 * This returns the current regulator voltage in uV.
3968 * NOTE: If the regulator is disabled it will return the voltage value. This
3969 * function should not be used to determine regulator state.
3971 int regulator_get_voltage(struct regulator *regulator)
3973 struct ww_acquire_ctx ww_ctx;
3976 regulator_lock_dependent(regulator->rdev, &ww_ctx);
3977 ret = _regulator_get_voltage(regulator->rdev);
3978 regulator_unlock_dependent(regulator->rdev, &ww_ctx);
3982 EXPORT_SYMBOL_GPL(regulator_get_voltage);
3985 * regulator_set_current_limit - set regulator output current limit
3986 * @regulator: regulator source
3987 * @min_uA: Minimum supported current in uA
3988 * @max_uA: Maximum supported current in uA
3990 * Sets current sink to the desired output current. This can be set during
3991 * any regulator state. IOW, regulator can be disabled or enabled.
3993 * If the regulator is enabled then the current will change to the new value
3994 * immediately otherwise if the regulator is disabled the regulator will
3995 * output at the new current when enabled.
3997 * NOTE: Regulator system constraints must be set for this regulator before
3998 * calling this function otherwise this call will fail.
4000 int regulator_set_current_limit(struct regulator *regulator,
4001 int min_uA, int max_uA)
4003 struct regulator_dev *rdev = regulator->rdev;
4006 regulator_lock(rdev);
4009 if (!rdev->desc->ops->set_current_limit) {
4014 /* constraints check */
4015 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
4019 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
4021 regulator_unlock(rdev);
4024 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
4026 static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev)
4029 if (!rdev->desc->ops->get_current_limit)
4032 return rdev->desc->ops->get_current_limit(rdev);
4035 static int _regulator_get_current_limit(struct regulator_dev *rdev)
4039 regulator_lock(rdev);
4040 ret = _regulator_get_current_limit_unlocked(rdev);
4041 regulator_unlock(rdev);
4047 * regulator_get_current_limit - get regulator output current
4048 * @regulator: regulator source
4050 * This returns the current supplied by the specified current sink in uA.
4052 * NOTE: If the regulator is disabled it will return the current value. This
4053 * function should not be used to determine regulator state.
4055 int regulator_get_current_limit(struct regulator *regulator)
4057 return _regulator_get_current_limit(regulator->rdev);
4059 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
4062 * regulator_set_mode - set regulator operating mode
4063 * @regulator: regulator source
4064 * @mode: operating mode - one of the REGULATOR_MODE constants
4066 * Set regulator operating mode to increase regulator efficiency or improve
4067 * regulation performance.
4069 * NOTE: Regulator system constraints must be set for this regulator before
4070 * calling this function otherwise this call will fail.
4072 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
4074 struct regulator_dev *rdev = regulator->rdev;
4076 int regulator_curr_mode;
4078 regulator_lock(rdev);
4081 if (!rdev->desc->ops->set_mode) {
4086 /* return if the same mode is requested */
4087 if (rdev->desc->ops->get_mode) {
4088 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
4089 if (regulator_curr_mode == mode) {
4095 /* constraints check */
4096 ret = regulator_mode_constrain(rdev, &mode);
4100 ret = rdev->desc->ops->set_mode(rdev, mode);
4102 regulator_unlock(rdev);
4105 EXPORT_SYMBOL_GPL(regulator_set_mode);
4107 static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev)
4110 if (!rdev->desc->ops->get_mode)
4113 return rdev->desc->ops->get_mode(rdev);
4116 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
4120 regulator_lock(rdev);
4121 ret = _regulator_get_mode_unlocked(rdev);
4122 regulator_unlock(rdev);
4128 * regulator_get_mode - get regulator operating mode
4129 * @regulator: regulator source
4131 * Get the current regulator operating mode.
4133 unsigned int regulator_get_mode(struct regulator *regulator)
4135 return _regulator_get_mode(regulator->rdev);
4137 EXPORT_SYMBOL_GPL(regulator_get_mode);
4139 static int _regulator_get_error_flags(struct regulator_dev *rdev,
4140 unsigned int *flags)
4144 regulator_lock(rdev);
4147 if (!rdev->desc->ops->get_error_flags) {
4152 ret = rdev->desc->ops->get_error_flags(rdev, flags);
4154 regulator_unlock(rdev);
4159 * regulator_get_error_flags - get regulator error information
4160 * @regulator: regulator source
4161 * @flags: pointer to store error flags
4163 * Get the current regulator error information.
4165 int regulator_get_error_flags(struct regulator *regulator,
4166 unsigned int *flags)
4168 return _regulator_get_error_flags(regulator->rdev, flags);
4170 EXPORT_SYMBOL_GPL(regulator_get_error_flags);
4173 * regulator_set_load - set regulator load
4174 * @regulator: regulator source
4175 * @uA_load: load current
4177 * Notifies the regulator core of a new device load. This is then used by
4178 * DRMS (if enabled by constraints) to set the most efficient regulator
4179 * operating mode for the new regulator loading.
4181 * Consumer devices notify their supply regulator of the maximum power
4182 * they will require (can be taken from device datasheet in the power
4183 * consumption tables) when they change operational status and hence power
4184 * state. Examples of operational state changes that can affect power
4185 * consumption are :-
4187 * o Device is opened / closed.
4188 * o Device I/O is about to begin or has just finished.
4189 * o Device is idling in between work.
4191 * This information is also exported via sysfs to userspace.
4193 * DRMS will sum the total requested load on the regulator and change
4194 * to the most efficient operating mode if platform constraints allow.
4196 * NOTE: when a regulator consumer requests to have a regulator
4197 * disabled then any load that consumer requested no longer counts
4198 * toward the total requested load. If the regulator is re-enabled
4199 * then the previously requested load will start counting again.
4201 * If a regulator is an always-on regulator then an individual consumer's
4202 * load will still be removed if that consumer is fully disabled.
4204 * On error a negative errno is returned.
4206 int regulator_set_load(struct regulator *regulator, int uA_load)
4208 struct regulator_dev *rdev = regulator->rdev;
4212 regulator_lock(rdev);
4213 old_uA_load = regulator->uA_load;
4214 regulator->uA_load = uA_load;
4215 if (regulator->enable_count && old_uA_load != uA_load) {
4216 ret = drms_uA_update(rdev);
4218 regulator->uA_load = old_uA_load;
4220 regulator_unlock(rdev);
4224 EXPORT_SYMBOL_GPL(regulator_set_load);
4227 * regulator_allow_bypass - allow the regulator to go into bypass mode
4229 * @regulator: Regulator to configure
4230 * @enable: enable or disable bypass mode
4232 * Allow the regulator to go into bypass mode if all other consumers
4233 * for the regulator also enable bypass mode and the machine
4234 * constraints allow this. Bypass mode means that the regulator is
4235 * simply passing the input directly to the output with no regulation.
4237 int regulator_allow_bypass(struct regulator *regulator, bool enable)
4239 struct regulator_dev *rdev = regulator->rdev;
4242 if (!rdev->desc->ops->set_bypass)
4245 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS))
4248 regulator_lock(rdev);
4250 if (enable && !regulator->bypass) {
4251 rdev->bypass_count++;
4253 if (rdev->bypass_count == rdev->open_count) {
4254 ret = rdev->desc->ops->set_bypass(rdev, enable);
4256 rdev->bypass_count--;
4259 } else if (!enable && regulator->bypass) {
4260 rdev->bypass_count--;
4262 if (rdev->bypass_count != rdev->open_count) {
4263 ret = rdev->desc->ops->set_bypass(rdev, enable);
4265 rdev->bypass_count++;
4270 regulator->bypass = enable;
4272 regulator_unlock(rdev);
4276 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
4279 * regulator_register_notifier - register regulator event notifier
4280 * @regulator: regulator source
4281 * @nb: notifier block
4283 * Register notifier block to receive regulator events.
4285 int regulator_register_notifier(struct regulator *regulator,
4286 struct notifier_block *nb)
4288 return blocking_notifier_chain_register(®ulator->rdev->notifier,
4291 EXPORT_SYMBOL_GPL(regulator_register_notifier);
4294 * regulator_unregister_notifier - unregister regulator event notifier
4295 * @regulator: regulator source
4296 * @nb: notifier block
4298 * Unregister regulator event notifier block.
4300 int regulator_unregister_notifier(struct regulator *regulator,
4301 struct notifier_block *nb)
4303 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
4306 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
4308 /* notify regulator consumers and downstream regulator consumers.
4309 * Note mutex must be held by caller.
4311 static int _notifier_call_chain(struct regulator_dev *rdev,
4312 unsigned long event, void *data)
4314 /* call rdev chain first */
4315 return blocking_notifier_call_chain(&rdev->notifier, event, data);
4319 * regulator_bulk_get - get multiple regulator consumers
4321 * @dev: Device to supply
4322 * @num_consumers: Number of consumers to register
4323 * @consumers: Configuration of consumers; clients are stored here.
4325 * @return 0 on success, an errno on failure.
4327 * This helper function allows drivers to get several regulator
4328 * consumers in one operation. If any of the regulators cannot be
4329 * acquired then any regulators that were allocated will be freed
4330 * before returning to the caller.
4332 int regulator_bulk_get(struct device *dev, int num_consumers,
4333 struct regulator_bulk_data *consumers)
4338 for (i = 0; i < num_consumers; i++)
4339 consumers[i].consumer = NULL;
4341 for (i = 0; i < num_consumers; i++) {
4342 consumers[i].consumer = regulator_get(dev,
4343 consumers[i].supply);
4344 if (IS_ERR(consumers[i].consumer)) {
4345 ret = PTR_ERR(consumers[i].consumer);
4346 consumers[i].consumer = NULL;
4354 if (ret != -EPROBE_DEFER)
4355 dev_err(dev, "Failed to get supply '%s': %d\n",
4356 consumers[i].supply, ret);
4358 dev_dbg(dev, "Failed to get supply '%s', deferring\n",
4359 consumers[i].supply);
4362 regulator_put(consumers[i].consumer);
4366 EXPORT_SYMBOL_GPL(regulator_bulk_get);
4368 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
4370 struct regulator_bulk_data *bulk = data;
4372 bulk->ret = regulator_enable(bulk->consumer);
4376 * regulator_bulk_enable - enable multiple regulator consumers
4378 * @num_consumers: Number of consumers
4379 * @consumers: Consumer data; clients are stored here.
4380 * @return 0 on success, an errno on failure
4382 * This convenience API allows consumers to enable multiple regulator
4383 * clients in a single API call. If any consumers cannot be enabled
4384 * then any others that were enabled will be disabled again prior to
4387 int regulator_bulk_enable(int num_consumers,
4388 struct regulator_bulk_data *consumers)
4390 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
4394 for (i = 0; i < num_consumers; i++) {
4395 async_schedule_domain(regulator_bulk_enable_async,
4396 &consumers[i], &async_domain);
4399 async_synchronize_full_domain(&async_domain);
4401 /* If any consumer failed we need to unwind any that succeeded */
4402 for (i = 0; i < num_consumers; i++) {
4403 if (consumers[i].ret != 0) {
4404 ret = consumers[i].ret;
4412 for (i = 0; i < num_consumers; i++) {
4413 if (consumers[i].ret < 0)
4414 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
4417 regulator_disable(consumers[i].consumer);
4422 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
4425 * regulator_bulk_disable - disable multiple regulator consumers
4427 * @num_consumers: Number of consumers
4428 * @consumers: Consumer data; clients are stored here.
4429 * @return 0 on success, an errno on failure
4431 * This convenience API allows consumers to disable multiple regulator
4432 * clients in a single API call. If any consumers cannot be disabled
4433 * then any others that were disabled will be enabled again prior to
4436 int regulator_bulk_disable(int num_consumers,
4437 struct regulator_bulk_data *consumers)
4442 for (i = num_consumers - 1; i >= 0; --i) {
4443 ret = regulator_disable(consumers[i].consumer);
4451 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
4452 for (++i; i < num_consumers; ++i) {
4453 r = regulator_enable(consumers[i].consumer);
4455 pr_err("Failed to re-enable %s: %d\n",
4456 consumers[i].supply, r);
4461 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
4464 * regulator_bulk_force_disable - force disable multiple regulator consumers
4466 * @num_consumers: Number of consumers
4467 * @consumers: Consumer data; clients are stored here.
4468 * @return 0 on success, an errno on failure
4470 * This convenience API allows consumers to forcibly disable multiple regulator
4471 * clients in a single API call.
4472 * NOTE: This should be used for situations when device damage will
4473 * likely occur if the regulators are not disabled (e.g. over temp).
4474 * Although regulator_force_disable function call for some consumers can
4475 * return error numbers, the function is called for all consumers.
4477 int regulator_bulk_force_disable(int num_consumers,
4478 struct regulator_bulk_data *consumers)
4483 for (i = 0; i < num_consumers; i++) {
4485 regulator_force_disable(consumers[i].consumer);
4487 /* Store first error for reporting */
4488 if (consumers[i].ret && !ret)
4489 ret = consumers[i].ret;
4494 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
4497 * regulator_bulk_free - free multiple regulator consumers
4499 * @num_consumers: Number of consumers
4500 * @consumers: Consumer data; clients are stored here.
4502 * This convenience API allows consumers to free multiple regulator
4503 * clients in a single API call.
4505 void regulator_bulk_free(int num_consumers,
4506 struct regulator_bulk_data *consumers)
4510 for (i = 0; i < num_consumers; i++) {
4511 regulator_put(consumers[i].consumer);
4512 consumers[i].consumer = NULL;
4515 EXPORT_SYMBOL_GPL(regulator_bulk_free);
4518 * regulator_notifier_call_chain - call regulator event notifier
4519 * @rdev: regulator source
4520 * @event: notifier block
4521 * @data: callback-specific data.
4523 * Called by regulator drivers to notify clients a regulator event has
4524 * occurred. We also notify regulator clients downstream.
4525 * Note lock must be held by caller.
4527 int regulator_notifier_call_chain(struct regulator_dev *rdev,
4528 unsigned long event, void *data)
4530 lockdep_assert_held_once(&rdev->mutex.base);
4532 _notifier_call_chain(rdev, event, data);
4536 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
4539 * regulator_mode_to_status - convert a regulator mode into a status
4541 * @mode: Mode to convert
4543 * Convert a regulator mode into a status.
4545 int regulator_mode_to_status(unsigned int mode)
4548 case REGULATOR_MODE_FAST:
4549 return REGULATOR_STATUS_FAST;
4550 case REGULATOR_MODE_NORMAL:
4551 return REGULATOR_STATUS_NORMAL;
4552 case REGULATOR_MODE_IDLE:
4553 return REGULATOR_STATUS_IDLE;
4554 case REGULATOR_MODE_STANDBY:
4555 return REGULATOR_STATUS_STANDBY;
4557 return REGULATOR_STATUS_UNDEFINED;
4560 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
4562 static struct attribute *regulator_dev_attrs[] = {
4563 &dev_attr_name.attr,
4564 &dev_attr_num_users.attr,
4565 &dev_attr_type.attr,
4566 &dev_attr_microvolts.attr,
4567 &dev_attr_microamps.attr,
4568 &dev_attr_opmode.attr,
4569 &dev_attr_state.attr,
4570 &dev_attr_status.attr,
4571 &dev_attr_bypass.attr,
4572 &dev_attr_requested_microamps.attr,
4573 &dev_attr_min_microvolts.attr,
4574 &dev_attr_max_microvolts.attr,
4575 &dev_attr_min_microamps.attr,
4576 &dev_attr_max_microamps.attr,
4577 &dev_attr_suspend_standby_state.attr,
4578 &dev_attr_suspend_mem_state.attr,
4579 &dev_attr_suspend_disk_state.attr,
4580 &dev_attr_suspend_standby_microvolts.attr,
4581 &dev_attr_suspend_mem_microvolts.attr,
4582 &dev_attr_suspend_disk_microvolts.attr,
4583 &dev_attr_suspend_standby_mode.attr,
4584 &dev_attr_suspend_mem_mode.attr,
4585 &dev_attr_suspend_disk_mode.attr,
4590 * To avoid cluttering sysfs (and memory) with useless state, only
4591 * create attributes that can be meaningfully displayed.
4593 static umode_t regulator_attr_is_visible(struct kobject *kobj,
4594 struct attribute *attr, int idx)
4596 struct device *dev = kobj_to_dev(kobj);
4597 struct regulator_dev *rdev = dev_to_rdev(dev);
4598 const struct regulator_ops *ops = rdev->desc->ops;
4599 umode_t mode = attr->mode;
4601 /* these three are always present */
4602 if (attr == &dev_attr_name.attr ||
4603 attr == &dev_attr_num_users.attr ||
4604 attr == &dev_attr_type.attr)
4607 /* some attributes need specific methods to be displayed */
4608 if (attr == &dev_attr_microvolts.attr) {
4609 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
4610 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
4611 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
4612 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
4617 if (attr == &dev_attr_microamps.attr)
4618 return ops->get_current_limit ? mode : 0;
4620 if (attr == &dev_attr_opmode.attr)
4621 return ops->get_mode ? mode : 0;
4623 if (attr == &dev_attr_state.attr)
4624 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
4626 if (attr == &dev_attr_status.attr)
4627 return ops->get_status ? mode : 0;
4629 if (attr == &dev_attr_bypass.attr)
4630 return ops->get_bypass ? mode : 0;
4632 /* constraints need specific supporting methods */
4633 if (attr == &dev_attr_min_microvolts.attr ||
4634 attr == &dev_attr_max_microvolts.attr)
4635 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
4637 if (attr == &dev_attr_min_microamps.attr ||
4638 attr == &dev_attr_max_microamps.attr)
4639 return ops->set_current_limit ? mode : 0;
4641 if (attr == &dev_attr_suspend_standby_state.attr ||
4642 attr == &dev_attr_suspend_mem_state.attr ||
4643 attr == &dev_attr_suspend_disk_state.attr)
4646 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
4647 attr == &dev_attr_suspend_mem_microvolts.attr ||
4648 attr == &dev_attr_suspend_disk_microvolts.attr)
4649 return ops->set_suspend_voltage ? mode : 0;
4651 if (attr == &dev_attr_suspend_standby_mode.attr ||
4652 attr == &dev_attr_suspend_mem_mode.attr ||
4653 attr == &dev_attr_suspend_disk_mode.attr)
4654 return ops->set_suspend_mode ? mode : 0;
4659 static const struct attribute_group regulator_dev_group = {
4660 .attrs = regulator_dev_attrs,
4661 .is_visible = regulator_attr_is_visible,
4664 static const struct attribute_group *regulator_dev_groups[] = {
4665 ®ulator_dev_group,
4669 static void regulator_dev_release(struct device *dev)
4671 struct regulator_dev *rdev = dev_get_drvdata(dev);
4673 kfree(rdev->constraints);
4674 of_node_put(rdev->dev.of_node);
4678 static void rdev_init_debugfs(struct regulator_dev *rdev)
4680 struct device *parent = rdev->dev.parent;
4681 const char *rname = rdev_get_name(rdev);
4682 char name[NAME_MAX];
4684 /* Avoid duplicate debugfs directory names */
4685 if (parent && rname == rdev->desc->name) {
4686 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
4691 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
4692 if (!rdev->debugfs) {
4693 rdev_warn(rdev, "Failed to create debugfs directory\n");
4697 debugfs_create_u32("use_count", 0444, rdev->debugfs,
4699 debugfs_create_u32("open_count", 0444, rdev->debugfs,
4701 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
4702 &rdev->bypass_count);
4705 static int regulator_register_resolve_supply(struct device *dev, void *data)
4707 struct regulator_dev *rdev = dev_to_rdev(dev);
4709 if (regulator_resolve_supply(rdev))
4710 rdev_dbg(rdev, "unable to resolve supply\n");
4715 static void regulator_resolve_coupling(struct regulator_dev *rdev)
4717 struct coupling_desc *c_desc = &rdev->coupling_desc;
4718 int n_coupled = c_desc->n_coupled;
4719 struct regulator_dev *c_rdev;
4722 for (i = 1; i < n_coupled; i++) {
4723 /* already resolved */
4724 if (c_desc->coupled_rdevs[i])
4727 c_rdev = of_parse_coupled_regulator(rdev, i - 1);
4732 regulator_lock(c_rdev);
4734 c_desc->coupled_rdevs[i] = c_rdev;
4735 c_desc->n_resolved++;
4737 regulator_unlock(c_rdev);
4739 regulator_resolve_coupling(c_rdev);
4743 static void regulator_remove_coupling(struct regulator_dev *rdev)
4745 struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc;
4746 struct regulator_dev *__c_rdev, *c_rdev;
4747 unsigned int __n_coupled, n_coupled;
4750 n_coupled = c_desc->n_coupled;
4752 for (i = 1; i < n_coupled; i++) {
4753 c_rdev = c_desc->coupled_rdevs[i];
4758 regulator_lock(c_rdev);
4760 __c_desc = &c_rdev->coupling_desc;
4761 __n_coupled = __c_desc->n_coupled;
4763 for (k = 1; k < __n_coupled; k++) {
4764 __c_rdev = __c_desc->coupled_rdevs[k];
4766 if (__c_rdev == rdev) {
4767 __c_desc->coupled_rdevs[k] = NULL;
4768 __c_desc->n_resolved--;
4773 regulator_unlock(c_rdev);
4775 c_desc->coupled_rdevs[i] = NULL;
4776 c_desc->n_resolved--;
4780 static int regulator_init_coupling(struct regulator_dev *rdev)
4784 if (!IS_ENABLED(CONFIG_OF))
4787 n_phandles = of_get_n_coupled(rdev);
4789 if (n_phandles + 1 > MAX_COUPLED) {
4790 rdev_err(rdev, "too many regulators coupled\n");
4795 * Every regulator should always have coupling descriptor filled with
4796 * at least pointer to itself.
4798 rdev->coupling_desc.coupled_rdevs[0] = rdev;
4799 rdev->coupling_desc.n_coupled = n_phandles + 1;
4800 rdev->coupling_desc.n_resolved++;
4802 /* regulator isn't coupled */
4803 if (n_phandles == 0)
4806 /* regulator, which can't change its voltage, can't be coupled */
4807 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
4808 rdev_err(rdev, "voltage operation not allowed\n");
4812 if (rdev->constraints->max_spread <= 0) {
4813 rdev_err(rdev, "wrong max_spread value\n");
4817 if (!of_check_coupling_data(rdev))
4824 * regulator_register - register regulator
4825 * @regulator_desc: regulator to register
4826 * @cfg: runtime configuration for regulator
4828 * Called by regulator drivers to register a regulator.
4829 * Returns a valid pointer to struct regulator_dev on success
4830 * or an ERR_PTR() on error.
4832 struct regulator_dev *
4833 regulator_register(const struct regulator_desc *regulator_desc,
4834 const struct regulator_config *cfg)
4836 const struct regulation_constraints *constraints = NULL;
4837 const struct regulator_init_data *init_data;
4838 struct regulator_config *config = NULL;
4839 static atomic_t regulator_no = ATOMIC_INIT(-1);
4840 struct regulator_dev *rdev;
4841 bool dangling_cfg_gpiod = false;
4842 bool dangling_of_gpiod = false;
4847 return ERR_PTR(-EINVAL);
4849 dangling_cfg_gpiod = true;
4850 if (regulator_desc == NULL) {
4858 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) {
4863 if (regulator_desc->type != REGULATOR_VOLTAGE &&
4864 regulator_desc->type != REGULATOR_CURRENT) {
4869 /* Only one of each should be implemented */
4870 WARN_ON(regulator_desc->ops->get_voltage &&
4871 regulator_desc->ops->get_voltage_sel);
4872 WARN_ON(regulator_desc->ops->set_voltage &&
4873 regulator_desc->ops->set_voltage_sel);
4875 /* If we're using selectors we must implement list_voltage. */
4876 if (regulator_desc->ops->get_voltage_sel &&
4877 !regulator_desc->ops->list_voltage) {
4881 if (regulator_desc->ops->set_voltage_sel &&
4882 !regulator_desc->ops->list_voltage) {
4887 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
4894 * Duplicate the config so the driver could override it after
4895 * parsing init data.
4897 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
4898 if (config == NULL) {
4904 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
4905 &rdev->dev.of_node);
4907 * We need to keep track of any GPIO descriptor coming from the
4908 * device tree until we have handled it over to the core. If the
4909 * config that was passed in to this function DOES NOT contain
4910 * a descriptor, and the config after this call DOES contain
4911 * a descriptor, we definitely got one from parsing the device
4914 if (!cfg->ena_gpiod && config->ena_gpiod)
4915 dangling_of_gpiod = true;
4917 init_data = config->init_data;
4918 rdev->dev.of_node = of_node_get(config->of_node);
4921 ww_mutex_init(&rdev->mutex, ®ulator_ww_class);
4922 rdev->reg_data = config->driver_data;
4923 rdev->owner = regulator_desc->owner;
4924 rdev->desc = regulator_desc;
4926 rdev->regmap = config->regmap;
4927 else if (dev_get_regmap(dev, NULL))
4928 rdev->regmap = dev_get_regmap(dev, NULL);
4929 else if (dev->parent)
4930 rdev->regmap = dev_get_regmap(dev->parent, NULL);
4931 INIT_LIST_HEAD(&rdev->consumer_list);
4932 INIT_LIST_HEAD(&rdev->list);
4933 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
4934 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
4936 /* preform any regulator specific init */
4937 if (init_data && init_data->regulator_init) {
4938 ret = init_data->regulator_init(rdev->reg_data);
4943 if (config->ena_gpiod) {
4944 mutex_lock(®ulator_list_mutex);
4945 ret = regulator_ena_gpio_request(rdev, config);
4946 mutex_unlock(®ulator_list_mutex);
4948 rdev_err(rdev, "Failed to request enable GPIO: %d\n",
4952 /* The regulator core took over the GPIO descriptor */
4953 dangling_cfg_gpiod = false;
4954 dangling_of_gpiod = false;
4957 /* register with sysfs */
4958 rdev->dev.class = ®ulator_class;
4959 rdev->dev.parent = dev;
4960 dev_set_name(&rdev->dev, "regulator.%lu",
4961 (unsigned long) atomic_inc_return(®ulator_no));
4963 /* set regulator constraints */
4965 constraints = &init_data->constraints;
4967 if (init_data && init_data->supply_regulator)
4968 rdev->supply_name = init_data->supply_regulator;
4969 else if (regulator_desc->supply_name)
4970 rdev->supply_name = regulator_desc->supply_name;
4973 * Attempt to resolve the regulator supply, if specified,
4974 * but don't return an error if we fail because we will try
4975 * to resolve it again later as more regulators are added.
4977 if (regulator_resolve_supply(rdev))
4978 rdev_dbg(rdev, "unable to resolve supply\n");
4980 ret = set_machine_constraints(rdev, constraints);
4984 ret = regulator_init_coupling(rdev);
4988 /* add consumers devices */
4990 mutex_lock(®ulator_list_mutex);
4991 for (i = 0; i < init_data->num_consumer_supplies; i++) {
4992 ret = set_consumer_device_supply(rdev,
4993 init_data->consumer_supplies[i].dev_name,
4994 init_data->consumer_supplies[i].supply);
4996 mutex_unlock(®ulator_list_mutex);
4997 dev_err(dev, "Failed to set supply %s\n",
4998 init_data->consumer_supplies[i].supply);
4999 goto unset_supplies;
5002 mutex_unlock(®ulator_list_mutex);
5005 if (!rdev->desc->ops->get_voltage &&
5006 !rdev->desc->ops->list_voltage &&
5007 !rdev->desc->fixed_uV)
5008 rdev->is_switch = true;
5010 dev_set_drvdata(&rdev->dev, rdev);
5011 ret = device_register(&rdev->dev);
5013 put_device(&rdev->dev);
5014 goto unset_supplies;
5017 rdev_init_debugfs(rdev);
5019 /* try to resolve regulators coupling since a new one was registered */
5020 mutex_lock(®ulator_list_mutex);
5021 regulator_resolve_coupling(rdev);
5022 mutex_unlock(®ulator_list_mutex);
5024 /* try to resolve regulators supply since a new one was registered */
5025 class_for_each_device(®ulator_class, NULL, NULL,
5026 regulator_register_resolve_supply);
5031 mutex_lock(®ulator_list_mutex);
5032 unset_regulator_supplies(rdev);
5033 mutex_unlock(®ulator_list_mutex);
5035 kfree(rdev->constraints);
5036 mutex_lock(®ulator_list_mutex);
5037 regulator_ena_gpio_free(rdev);
5038 mutex_unlock(®ulator_list_mutex);
5040 if (dangling_of_gpiod)
5041 gpiod_put(config->ena_gpiod);
5045 if (dangling_cfg_gpiod)
5046 gpiod_put(cfg->ena_gpiod);
5047 return ERR_PTR(ret);
5049 EXPORT_SYMBOL_GPL(regulator_register);
5052 * regulator_unregister - unregister regulator
5053 * @rdev: regulator to unregister
5055 * Called by regulator drivers to unregister a regulator.
5057 void regulator_unregister(struct regulator_dev *rdev)
5063 while (rdev->use_count--)
5064 regulator_disable(rdev->supply);
5065 regulator_put(rdev->supply);
5068 flush_work(&rdev->disable_work.work);
5070 mutex_lock(®ulator_list_mutex);
5072 debugfs_remove_recursive(rdev->debugfs);
5073 WARN_ON(rdev->open_count);
5074 regulator_remove_coupling(rdev);
5075 unset_regulator_supplies(rdev);
5076 list_del(&rdev->list);
5077 regulator_ena_gpio_free(rdev);
5078 device_unregister(&rdev->dev);
5080 mutex_unlock(®ulator_list_mutex);
5082 EXPORT_SYMBOL_GPL(regulator_unregister);
5084 #ifdef CONFIG_SUSPEND
5086 * regulator_suspend - prepare regulators for system wide suspend
5087 * @dev: ``&struct device`` pointer that is passed to _regulator_suspend()
5089 * Configure each regulator with it's suspend operating parameters for state.
5091 static int regulator_suspend(struct device *dev)
5093 struct regulator_dev *rdev = dev_to_rdev(dev);
5094 suspend_state_t state = pm_suspend_target_state;
5097 regulator_lock(rdev);
5098 ret = suspend_set_state(rdev, state);
5099 regulator_unlock(rdev);
5104 static int regulator_resume(struct device *dev)
5106 suspend_state_t state = pm_suspend_target_state;
5107 struct regulator_dev *rdev = dev_to_rdev(dev);
5108 struct regulator_state *rstate;
5111 rstate = regulator_get_suspend_state(rdev, state);
5115 regulator_lock(rdev);
5117 if (rdev->desc->ops->resume &&
5118 (rstate->enabled == ENABLE_IN_SUSPEND ||
5119 rstate->enabled == DISABLE_IN_SUSPEND))
5120 ret = rdev->desc->ops->resume(rdev);
5122 regulator_unlock(rdev);
5126 #else /* !CONFIG_SUSPEND */
5128 #define regulator_suspend NULL
5129 #define regulator_resume NULL
5131 #endif /* !CONFIG_SUSPEND */
5134 static const struct dev_pm_ops __maybe_unused regulator_pm_ops = {
5135 .suspend = regulator_suspend,
5136 .resume = regulator_resume,
5140 struct class regulator_class = {
5141 .name = "regulator",
5142 .dev_release = regulator_dev_release,
5143 .dev_groups = regulator_dev_groups,
5145 .pm = ®ulator_pm_ops,
5149 * regulator_has_full_constraints - the system has fully specified constraints
5151 * Calling this function will cause the regulator API to disable all
5152 * regulators which have a zero use count and don't have an always_on
5153 * constraint in a late_initcall.
5155 * The intention is that this will become the default behaviour in a
5156 * future kernel release so users are encouraged to use this facility
5159 void regulator_has_full_constraints(void)
5161 has_full_constraints = 1;
5163 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
5166 * rdev_get_drvdata - get rdev regulator driver data
5169 * Get rdev regulator driver private data. This call can be used in the
5170 * regulator driver context.
5172 void *rdev_get_drvdata(struct regulator_dev *rdev)
5174 return rdev->reg_data;
5176 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
5179 * regulator_get_drvdata - get regulator driver data
5180 * @regulator: regulator
5182 * Get regulator driver private data. This call can be used in the consumer
5183 * driver context when non API regulator specific functions need to be called.
5185 void *regulator_get_drvdata(struct regulator *regulator)
5187 return regulator->rdev->reg_data;
5189 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
5192 * regulator_set_drvdata - set regulator driver data
5193 * @regulator: regulator
5196 void regulator_set_drvdata(struct regulator *regulator, void *data)
5198 regulator->rdev->reg_data = data;
5200 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
5203 * regulator_get_id - get regulator ID
5206 int rdev_get_id(struct regulator_dev *rdev)
5208 return rdev->desc->id;
5210 EXPORT_SYMBOL_GPL(rdev_get_id);
5212 struct device *rdev_get_dev(struct regulator_dev *rdev)
5216 EXPORT_SYMBOL_GPL(rdev_get_dev);
5218 struct regmap *rdev_get_regmap(struct regulator_dev *rdev)
5220 return rdev->regmap;
5222 EXPORT_SYMBOL_GPL(rdev_get_regmap);
5224 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
5226 return reg_init_data->driver_data;
5228 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
5230 #ifdef CONFIG_DEBUG_FS
5231 static int supply_map_show(struct seq_file *sf, void *data)
5233 struct regulator_map *map;
5235 list_for_each_entry(map, ®ulator_map_list, list) {
5236 seq_printf(sf, "%s -> %s.%s\n",
5237 rdev_get_name(map->regulator), map->dev_name,
5243 DEFINE_SHOW_ATTRIBUTE(supply_map);
5245 struct summary_data {
5247 struct regulator_dev *parent;
5251 static void regulator_summary_show_subtree(struct seq_file *s,
5252 struct regulator_dev *rdev,
5255 static int regulator_summary_show_children(struct device *dev, void *data)
5257 struct regulator_dev *rdev = dev_to_rdev(dev);
5258 struct summary_data *summary_data = data;
5260 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
5261 regulator_summary_show_subtree(summary_data->s, rdev,
5262 summary_data->level + 1);
5267 static void regulator_summary_show_subtree(struct seq_file *s,
5268 struct regulator_dev *rdev,
5271 struct regulation_constraints *c;
5272 struct regulator *consumer;
5273 struct summary_data summary_data;
5274 unsigned int opmode;
5279 opmode = _regulator_get_mode_unlocked(rdev);
5280 seq_printf(s, "%*s%-*s %3d %4d %6d %7s ",
5282 30 - level * 3, rdev_get_name(rdev),
5283 rdev->use_count, rdev->open_count, rdev->bypass_count,
5284 regulator_opmode_to_str(opmode));
5286 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
5287 seq_printf(s, "%5dmA ",
5288 _regulator_get_current_limit_unlocked(rdev) / 1000);
5290 c = rdev->constraints;
5292 switch (rdev->desc->type) {
5293 case REGULATOR_VOLTAGE:
5294 seq_printf(s, "%5dmV %5dmV ",
5295 c->min_uV / 1000, c->max_uV / 1000);
5297 case REGULATOR_CURRENT:
5298 seq_printf(s, "%5dmA %5dmA ",
5299 c->min_uA / 1000, c->max_uA / 1000);
5306 list_for_each_entry(consumer, &rdev->consumer_list, list) {
5307 if (consumer->dev && consumer->dev->class == ®ulator_class)
5310 seq_printf(s, "%*s%-*s ",
5311 (level + 1) * 3 + 1, "",
5312 30 - (level + 1) * 3,
5313 consumer->dev ? dev_name(consumer->dev) : "deviceless");
5315 switch (rdev->desc->type) {
5316 case REGULATOR_VOLTAGE:
5317 seq_printf(s, "%3d %33dmA%c%5dmV %5dmV",
5318 consumer->enable_count,
5319 consumer->uA_load / 1000,
5320 consumer->uA_load && !consumer->enable_count ?
5322 consumer->voltage[PM_SUSPEND_ON].min_uV / 1000,
5323 consumer->voltage[PM_SUSPEND_ON].max_uV / 1000);
5325 case REGULATOR_CURRENT:
5333 summary_data.level = level;
5334 summary_data.parent = rdev;
5336 class_for_each_device(®ulator_class, NULL, &summary_data,
5337 regulator_summary_show_children);
5340 struct summary_lock_data {
5341 struct ww_acquire_ctx *ww_ctx;
5342 struct regulator_dev **new_contended_rdev;
5343 struct regulator_dev **old_contended_rdev;
5346 static int regulator_summary_lock_one(struct device *dev, void *data)
5348 struct regulator_dev *rdev = dev_to_rdev(dev);
5349 struct summary_lock_data *lock_data = data;
5352 if (rdev != *lock_data->old_contended_rdev) {
5353 ret = regulator_lock_nested(rdev, lock_data->ww_ctx);
5355 if (ret == -EDEADLK)
5356 *lock_data->new_contended_rdev = rdev;
5360 *lock_data->old_contended_rdev = NULL;
5366 static int regulator_summary_unlock_one(struct device *dev, void *data)
5368 struct regulator_dev *rdev = dev_to_rdev(dev);
5369 struct summary_lock_data *lock_data = data;
5372 if (rdev == *lock_data->new_contended_rdev)
5376 regulator_unlock(rdev);
5381 static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx,
5382 struct regulator_dev **new_contended_rdev,
5383 struct regulator_dev **old_contended_rdev)
5385 struct summary_lock_data lock_data;
5388 lock_data.ww_ctx = ww_ctx;
5389 lock_data.new_contended_rdev = new_contended_rdev;
5390 lock_data.old_contended_rdev = old_contended_rdev;
5392 ret = class_for_each_device(®ulator_class, NULL, &lock_data,
5393 regulator_summary_lock_one);
5395 class_for_each_device(®ulator_class, NULL, &lock_data,
5396 regulator_summary_unlock_one);
5401 static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx)
5403 struct regulator_dev *new_contended_rdev = NULL;
5404 struct regulator_dev *old_contended_rdev = NULL;
5407 mutex_lock(®ulator_list_mutex);
5409 ww_acquire_init(ww_ctx, ®ulator_ww_class);
5412 if (new_contended_rdev) {
5413 ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx);
5414 old_contended_rdev = new_contended_rdev;
5415 old_contended_rdev->ref_cnt++;
5418 err = regulator_summary_lock_all(ww_ctx,
5419 &new_contended_rdev,
5420 &old_contended_rdev);
5422 if (old_contended_rdev)
5423 regulator_unlock(old_contended_rdev);
5425 } while (err == -EDEADLK);
5427 ww_acquire_done(ww_ctx);
5430 static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx)
5432 class_for_each_device(®ulator_class, NULL, NULL,
5433 regulator_summary_unlock_one);
5434 ww_acquire_fini(ww_ctx);
5436 mutex_unlock(®ulator_list_mutex);
5439 static int regulator_summary_show_roots(struct device *dev, void *data)
5441 struct regulator_dev *rdev = dev_to_rdev(dev);
5442 struct seq_file *s = data;
5445 regulator_summary_show_subtree(s, rdev, 0);
5450 static int regulator_summary_show(struct seq_file *s, void *data)
5452 struct ww_acquire_ctx ww_ctx;
5454 seq_puts(s, " regulator use open bypass opmode voltage current min max\n");
5455 seq_puts(s, "---------------------------------------------------------------------------------------\n");
5457 regulator_summary_lock(&ww_ctx);
5459 class_for_each_device(®ulator_class, NULL, s,
5460 regulator_summary_show_roots);
5462 regulator_summary_unlock(&ww_ctx);
5466 DEFINE_SHOW_ATTRIBUTE(regulator_summary);
5467 #endif /* CONFIG_DEBUG_FS */
5469 static int __init regulator_init(void)
5473 ret = class_register(®ulator_class);
5475 debugfs_root = debugfs_create_dir("regulator", NULL);
5477 pr_warn("regulator: Failed to create debugfs directory\n");
5479 #ifdef CONFIG_DEBUG_FS
5480 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
5483 debugfs_create_file("regulator_summary", 0444, debugfs_root,
5484 NULL, ®ulator_summary_fops);
5486 regulator_dummy_init();
5491 /* init early to allow our consumers to complete system booting */
5492 core_initcall(regulator_init);
5494 static int __init regulator_late_cleanup(struct device *dev, void *data)
5496 struct regulator_dev *rdev = dev_to_rdev(dev);
5497 const struct regulator_ops *ops = rdev->desc->ops;
5498 struct regulation_constraints *c = rdev->constraints;
5501 if (c && c->always_on)
5504 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS))
5507 regulator_lock(rdev);
5509 if (rdev->use_count)
5512 /* If we can't read the status assume it's on. */
5513 if (ops->is_enabled)
5514 enabled = ops->is_enabled(rdev);
5521 if (have_full_constraints()) {
5522 /* We log since this may kill the system if it goes
5524 rdev_info(rdev, "disabling\n");
5525 ret = _regulator_do_disable(rdev);
5527 rdev_err(rdev, "couldn't disable: %d\n", ret);
5529 /* The intention is that in future we will
5530 * assume that full constraints are provided
5531 * so warn even if we aren't going to do
5534 rdev_warn(rdev, "incomplete constraints, leaving on\n");
5538 regulator_unlock(rdev);
5543 static int __init regulator_init_complete(void)
5546 * Since DT doesn't provide an idiomatic mechanism for
5547 * enabling full constraints and since it's much more natural
5548 * with DT to provide them just assume that a DT enabled
5549 * system has full constraints.
5551 if (of_have_populated_dt())
5552 has_full_constraints = true;
5555 * Regulators may had failed to resolve their input supplies
5556 * when were registered, either because the input supply was
5557 * not registered yet or because its parent device was not
5558 * bound yet. So attempt to resolve the input supplies for
5559 * pending regulators before trying to disable unused ones.
5561 class_for_each_device(®ulator_class, NULL, NULL,
5562 regulator_register_resolve_supply);
5564 /* If we have a full configuration then disable any regulators
5565 * we have permission to change the status for and which are
5566 * not in use or always_on. This is effectively the default
5567 * for DT and ACPI as they have full constraints.
5569 class_for_each_device(®ulator_class, NULL, NULL,
5570 regulator_late_cleanup);
5574 late_initcall_sync(regulator_init_complete);