2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
27 #include <linux/gpio/consumer.h>
29 #include <linux/regmap.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/module.h>
36 #define CREATE_TRACE_POINTS
37 #include <trace/events/regulator.h>
42 #define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 #define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
53 static DEFINE_MUTEX(regulator_list_mutex);
54 static LIST_HEAD(regulator_map_list);
55 static LIST_HEAD(regulator_ena_gpio_list);
56 static LIST_HEAD(regulator_supply_alias_list);
57 static bool has_full_constraints;
59 static struct dentry *debugfs_root;
61 static struct class regulator_class;
64 * struct regulator_map
66 * Used to provide symbolic supply names to devices.
68 struct regulator_map {
69 struct list_head list;
70 const char *dev_name; /* The dev_name() for the consumer */
72 struct regulator_dev *regulator;
76 * struct regulator_enable_gpio
78 * Management for shared enable GPIO pin
80 struct regulator_enable_gpio {
81 struct list_head list;
82 struct gpio_desc *gpiod;
83 u32 enable_count; /* a number of enabled shared GPIO */
84 u32 request_count; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert:1;
89 * struct regulator_supply_alias
91 * Used to map lookups for a supply onto an alternative device.
93 struct regulator_supply_alias {
94 struct list_head list;
95 struct device *src_dev;
96 const char *src_supply;
97 struct device *alias_dev;
98 const char *alias_supply;
101 static int _regulator_is_enabled(struct regulator_dev *rdev);
102 static int _regulator_disable(struct regulator_dev *rdev);
103 static int _regulator_get_voltage(struct regulator_dev *rdev);
104 static int _regulator_get_current_limit(struct regulator_dev *rdev);
105 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
106 static int _notifier_call_chain(struct regulator_dev *rdev,
107 unsigned long event, void *data);
108 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
109 int min_uV, int max_uV);
110 static struct regulator *create_regulator(struct regulator_dev *rdev,
112 const char *supply_name);
113 static void _regulator_put(struct regulator *regulator);
115 static struct regulator_dev *dev_to_rdev(struct device *dev)
117 return container_of(dev, struct regulator_dev, dev);
120 static const char *rdev_get_name(struct regulator_dev *rdev)
122 if (rdev->constraints && rdev->constraints->name)
123 return rdev->constraints->name;
124 else if (rdev->desc->name)
125 return rdev->desc->name;
130 static bool have_full_constraints(void)
132 return has_full_constraints || of_have_populated_dt();
135 static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops)
137 if (!rdev->constraints) {
138 rdev_err(rdev, "no constraints\n");
142 if (rdev->constraints->valid_ops_mask & ops)
148 static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev)
150 if (rdev && rdev->supply)
151 return rdev->supply->rdev;
157 * regulator_lock_supply - lock a regulator and its supplies
158 * @rdev: regulator source
160 static void regulator_lock_supply(struct regulator_dev *rdev)
164 for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++)
165 mutex_lock_nested(&rdev->mutex, i);
169 * regulator_unlock_supply - unlock a regulator and its supplies
170 * @rdev: regulator source
172 static void regulator_unlock_supply(struct regulator_dev *rdev)
174 struct regulator *supply;
177 mutex_unlock(&rdev->mutex);
178 supply = rdev->supply;
188 * of_get_regulator - get a regulator device node based on supply name
189 * @dev: Device pointer for the consumer (of regulator) device
190 * @supply: regulator supply name
192 * Extract the regulator device node corresponding to the supply name.
193 * returns the device node corresponding to the regulator if found, else
196 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
198 struct device_node *regnode = NULL;
199 char prop_name[32]; /* 32 is max size of property name */
201 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
203 snprintf(prop_name, 32, "%s-supply", supply);
204 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
207 dev_dbg(dev, "Looking up %s property in node %s failed",
208 prop_name, dev->of_node->full_name);
214 /* Platform voltage constraint check */
215 static int regulator_check_voltage(struct regulator_dev *rdev,
216 int *min_uV, int *max_uV)
218 BUG_ON(*min_uV > *max_uV);
220 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
221 rdev_err(rdev, "voltage operation not allowed\n");
225 if (*max_uV > rdev->constraints->max_uV)
226 *max_uV = rdev->constraints->max_uV;
227 if (*min_uV < rdev->constraints->min_uV)
228 *min_uV = rdev->constraints->min_uV;
230 if (*min_uV > *max_uV) {
231 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
239 /* Make sure we select a voltage that suits the needs of all
240 * regulator consumers
242 static int regulator_check_consumers(struct regulator_dev *rdev,
243 int *min_uV, int *max_uV)
245 struct regulator *regulator;
247 list_for_each_entry(regulator, &rdev->consumer_list, list) {
249 * Assume consumers that didn't say anything are OK
250 * with anything in the constraint range.
252 if (!regulator->min_uV && !regulator->max_uV)
255 if (*max_uV > regulator->max_uV)
256 *max_uV = regulator->max_uV;
257 if (*min_uV < regulator->min_uV)
258 *min_uV = regulator->min_uV;
261 if (*min_uV > *max_uV) {
262 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
270 /* current constraint check */
271 static int regulator_check_current_limit(struct regulator_dev *rdev,
272 int *min_uA, int *max_uA)
274 BUG_ON(*min_uA > *max_uA);
276 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) {
277 rdev_err(rdev, "current operation not allowed\n");
281 if (*max_uA > rdev->constraints->max_uA)
282 *max_uA = rdev->constraints->max_uA;
283 if (*min_uA < rdev->constraints->min_uA)
284 *min_uA = rdev->constraints->min_uA;
286 if (*min_uA > *max_uA) {
287 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
295 /* operating mode constraint check */
296 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
299 case REGULATOR_MODE_FAST:
300 case REGULATOR_MODE_NORMAL:
301 case REGULATOR_MODE_IDLE:
302 case REGULATOR_MODE_STANDBY:
305 rdev_err(rdev, "invalid mode %x specified\n", *mode);
309 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) {
310 rdev_err(rdev, "mode operation not allowed\n");
314 /* The modes are bitmasks, the most power hungry modes having
315 * the lowest values. If the requested mode isn't supported
316 * try higher modes. */
318 if (rdev->constraints->valid_modes_mask & *mode)
326 static ssize_t regulator_uV_show(struct device *dev,
327 struct device_attribute *attr, char *buf)
329 struct regulator_dev *rdev = dev_get_drvdata(dev);
332 mutex_lock(&rdev->mutex);
333 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
334 mutex_unlock(&rdev->mutex);
338 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
340 static ssize_t regulator_uA_show(struct device *dev,
341 struct device_attribute *attr, char *buf)
343 struct regulator_dev *rdev = dev_get_drvdata(dev);
345 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
347 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
349 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
352 struct regulator_dev *rdev = dev_get_drvdata(dev);
354 return sprintf(buf, "%s\n", rdev_get_name(rdev));
356 static DEVICE_ATTR_RO(name);
358 static ssize_t regulator_print_opmode(char *buf, int mode)
361 case REGULATOR_MODE_FAST:
362 return sprintf(buf, "fast\n");
363 case REGULATOR_MODE_NORMAL:
364 return sprintf(buf, "normal\n");
365 case REGULATOR_MODE_IDLE:
366 return sprintf(buf, "idle\n");
367 case REGULATOR_MODE_STANDBY:
368 return sprintf(buf, "standby\n");
370 return sprintf(buf, "unknown\n");
373 static ssize_t regulator_opmode_show(struct device *dev,
374 struct device_attribute *attr, char *buf)
376 struct regulator_dev *rdev = dev_get_drvdata(dev);
378 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
380 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
382 static ssize_t regulator_print_state(char *buf, int state)
385 return sprintf(buf, "enabled\n");
387 return sprintf(buf, "disabled\n");
389 return sprintf(buf, "unknown\n");
392 static ssize_t regulator_state_show(struct device *dev,
393 struct device_attribute *attr, char *buf)
395 struct regulator_dev *rdev = dev_get_drvdata(dev);
398 mutex_lock(&rdev->mutex);
399 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
400 mutex_unlock(&rdev->mutex);
404 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
406 static ssize_t regulator_status_show(struct device *dev,
407 struct device_attribute *attr, char *buf)
409 struct regulator_dev *rdev = dev_get_drvdata(dev);
413 status = rdev->desc->ops->get_status(rdev);
418 case REGULATOR_STATUS_OFF:
421 case REGULATOR_STATUS_ON:
424 case REGULATOR_STATUS_ERROR:
427 case REGULATOR_STATUS_FAST:
430 case REGULATOR_STATUS_NORMAL:
433 case REGULATOR_STATUS_IDLE:
436 case REGULATOR_STATUS_STANDBY:
439 case REGULATOR_STATUS_BYPASS:
442 case REGULATOR_STATUS_UNDEFINED:
449 return sprintf(buf, "%s\n", label);
451 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
453 static ssize_t regulator_min_uA_show(struct device *dev,
454 struct device_attribute *attr, char *buf)
456 struct regulator_dev *rdev = dev_get_drvdata(dev);
458 if (!rdev->constraints)
459 return sprintf(buf, "constraint not defined\n");
461 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
463 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
465 static ssize_t regulator_max_uA_show(struct device *dev,
466 struct device_attribute *attr, char *buf)
468 struct regulator_dev *rdev = dev_get_drvdata(dev);
470 if (!rdev->constraints)
471 return sprintf(buf, "constraint not defined\n");
473 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
475 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
477 static ssize_t regulator_min_uV_show(struct device *dev,
478 struct device_attribute *attr, char *buf)
480 struct regulator_dev *rdev = dev_get_drvdata(dev);
482 if (!rdev->constraints)
483 return sprintf(buf, "constraint not defined\n");
485 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
487 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
489 static ssize_t regulator_max_uV_show(struct device *dev,
490 struct device_attribute *attr, char *buf)
492 struct regulator_dev *rdev = dev_get_drvdata(dev);
494 if (!rdev->constraints)
495 return sprintf(buf, "constraint not defined\n");
497 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
499 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
501 static ssize_t regulator_total_uA_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
504 struct regulator_dev *rdev = dev_get_drvdata(dev);
505 struct regulator *regulator;
508 mutex_lock(&rdev->mutex);
509 list_for_each_entry(regulator, &rdev->consumer_list, list)
510 uA += regulator->uA_load;
511 mutex_unlock(&rdev->mutex);
512 return sprintf(buf, "%d\n", uA);
514 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
516 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
519 struct regulator_dev *rdev = dev_get_drvdata(dev);
520 return sprintf(buf, "%d\n", rdev->use_count);
522 static DEVICE_ATTR_RO(num_users);
524 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
527 struct regulator_dev *rdev = dev_get_drvdata(dev);
529 switch (rdev->desc->type) {
530 case REGULATOR_VOLTAGE:
531 return sprintf(buf, "voltage\n");
532 case REGULATOR_CURRENT:
533 return sprintf(buf, "current\n");
535 return sprintf(buf, "unknown\n");
537 static DEVICE_ATTR_RO(type);
539 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
540 struct device_attribute *attr, char *buf)
542 struct regulator_dev *rdev = dev_get_drvdata(dev);
544 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
546 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
547 regulator_suspend_mem_uV_show, NULL);
549 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
550 struct device_attribute *attr, char *buf)
552 struct regulator_dev *rdev = dev_get_drvdata(dev);
554 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
556 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
557 regulator_suspend_disk_uV_show, NULL);
559 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
560 struct device_attribute *attr, char *buf)
562 struct regulator_dev *rdev = dev_get_drvdata(dev);
564 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
566 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
567 regulator_suspend_standby_uV_show, NULL);
569 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
570 struct device_attribute *attr, char *buf)
572 struct regulator_dev *rdev = dev_get_drvdata(dev);
574 return regulator_print_opmode(buf,
575 rdev->constraints->state_mem.mode);
577 static DEVICE_ATTR(suspend_mem_mode, 0444,
578 regulator_suspend_mem_mode_show, NULL);
580 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
581 struct device_attribute *attr, char *buf)
583 struct regulator_dev *rdev = dev_get_drvdata(dev);
585 return regulator_print_opmode(buf,
586 rdev->constraints->state_disk.mode);
588 static DEVICE_ATTR(suspend_disk_mode, 0444,
589 regulator_suspend_disk_mode_show, NULL);
591 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
592 struct device_attribute *attr, char *buf)
594 struct regulator_dev *rdev = dev_get_drvdata(dev);
596 return regulator_print_opmode(buf,
597 rdev->constraints->state_standby.mode);
599 static DEVICE_ATTR(suspend_standby_mode, 0444,
600 regulator_suspend_standby_mode_show, NULL);
602 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
603 struct device_attribute *attr, char *buf)
605 struct regulator_dev *rdev = dev_get_drvdata(dev);
607 return regulator_print_state(buf,
608 rdev->constraints->state_mem.enabled);
610 static DEVICE_ATTR(suspend_mem_state, 0444,
611 regulator_suspend_mem_state_show, NULL);
613 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
614 struct device_attribute *attr, char *buf)
616 struct regulator_dev *rdev = dev_get_drvdata(dev);
618 return regulator_print_state(buf,
619 rdev->constraints->state_disk.enabled);
621 static DEVICE_ATTR(suspend_disk_state, 0444,
622 regulator_suspend_disk_state_show, NULL);
624 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
625 struct device_attribute *attr, char *buf)
627 struct regulator_dev *rdev = dev_get_drvdata(dev);
629 return regulator_print_state(buf,
630 rdev->constraints->state_standby.enabled);
632 static DEVICE_ATTR(suspend_standby_state, 0444,
633 regulator_suspend_standby_state_show, NULL);
635 static ssize_t regulator_bypass_show(struct device *dev,
636 struct device_attribute *attr, char *buf)
638 struct regulator_dev *rdev = dev_get_drvdata(dev);
643 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
652 return sprintf(buf, "%s\n", report);
654 static DEVICE_ATTR(bypass, 0444,
655 regulator_bypass_show, NULL);
657 /* Calculate the new optimum regulator operating mode based on the new total
658 * consumer load. All locks held by caller */
659 static int drms_uA_update(struct regulator_dev *rdev)
661 struct regulator *sibling;
662 int current_uA = 0, output_uV, input_uV, err;
665 lockdep_assert_held_once(&rdev->mutex);
668 * first check to see if we can set modes at all, otherwise just
669 * tell the consumer everything is OK.
671 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
674 if (!rdev->desc->ops->get_optimum_mode &&
675 !rdev->desc->ops->set_load)
678 if (!rdev->desc->ops->set_mode &&
679 !rdev->desc->ops->set_load)
682 /* calc total requested load */
683 list_for_each_entry(sibling, &rdev->consumer_list, list)
684 current_uA += sibling->uA_load;
686 current_uA += rdev->constraints->system_load;
688 if (rdev->desc->ops->set_load) {
689 /* set the optimum mode for our new total regulator load */
690 err = rdev->desc->ops->set_load(rdev, current_uA);
692 rdev_err(rdev, "failed to set load %d\n", current_uA);
694 /* get output voltage */
695 output_uV = _regulator_get_voltage(rdev);
696 if (output_uV <= 0) {
697 rdev_err(rdev, "invalid output voltage found\n");
701 /* get input voltage */
704 input_uV = regulator_get_voltage(rdev->supply);
706 input_uV = rdev->constraints->input_uV;
708 rdev_err(rdev, "invalid input voltage found\n");
712 /* now get the optimum mode for our new total regulator load */
713 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
714 output_uV, current_uA);
716 /* check the new mode is allowed */
717 err = regulator_mode_constrain(rdev, &mode);
719 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
720 current_uA, input_uV, output_uV);
724 err = rdev->desc->ops->set_mode(rdev, mode);
726 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
732 static int suspend_set_state(struct regulator_dev *rdev,
733 struct regulator_state *rstate)
737 /* If we have no suspend mode configration don't set anything;
738 * only warn if the driver implements set_suspend_voltage or
739 * set_suspend_mode callback.
741 if (!rstate->enabled && !rstate->disabled) {
742 if (rdev->desc->ops->set_suspend_voltage ||
743 rdev->desc->ops->set_suspend_mode)
744 rdev_warn(rdev, "No configuration\n");
748 if (rstate->enabled && rstate->disabled) {
749 rdev_err(rdev, "invalid configuration\n");
753 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
754 ret = rdev->desc->ops->set_suspend_enable(rdev);
755 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
756 ret = rdev->desc->ops->set_suspend_disable(rdev);
757 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
761 rdev_err(rdev, "failed to enabled/disable\n");
765 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
766 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
768 rdev_err(rdev, "failed to set voltage\n");
773 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
774 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
776 rdev_err(rdev, "failed to set mode\n");
783 /* locks held by caller */
784 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
786 if (!rdev->constraints)
790 case PM_SUSPEND_STANDBY:
791 return suspend_set_state(rdev,
792 &rdev->constraints->state_standby);
794 return suspend_set_state(rdev,
795 &rdev->constraints->state_mem);
797 return suspend_set_state(rdev,
798 &rdev->constraints->state_disk);
804 static void print_constraints(struct regulator_dev *rdev)
806 struct regulation_constraints *constraints = rdev->constraints;
808 size_t len = sizeof(buf) - 1;
812 if (constraints->min_uV && constraints->max_uV) {
813 if (constraints->min_uV == constraints->max_uV)
814 count += scnprintf(buf + count, len - count, "%d mV ",
815 constraints->min_uV / 1000);
817 count += scnprintf(buf + count, len - count,
819 constraints->min_uV / 1000,
820 constraints->max_uV / 1000);
823 if (!constraints->min_uV ||
824 constraints->min_uV != constraints->max_uV) {
825 ret = _regulator_get_voltage(rdev);
827 count += scnprintf(buf + count, len - count,
828 "at %d mV ", ret / 1000);
831 if (constraints->uV_offset)
832 count += scnprintf(buf + count, len - count, "%dmV offset ",
833 constraints->uV_offset / 1000);
835 if (constraints->min_uA && constraints->max_uA) {
836 if (constraints->min_uA == constraints->max_uA)
837 count += scnprintf(buf + count, len - count, "%d mA ",
838 constraints->min_uA / 1000);
840 count += scnprintf(buf + count, len - count,
842 constraints->min_uA / 1000,
843 constraints->max_uA / 1000);
846 if (!constraints->min_uA ||
847 constraints->min_uA != constraints->max_uA) {
848 ret = _regulator_get_current_limit(rdev);
850 count += scnprintf(buf + count, len - count,
851 "at %d mA ", ret / 1000);
854 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
855 count += scnprintf(buf + count, len - count, "fast ");
856 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
857 count += scnprintf(buf + count, len - count, "normal ");
858 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
859 count += scnprintf(buf + count, len - count, "idle ");
860 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
861 count += scnprintf(buf + count, len - count, "standby");
864 scnprintf(buf, len, "no parameters");
866 rdev_dbg(rdev, "%s\n", buf);
868 if ((constraints->min_uV != constraints->max_uV) &&
869 !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE))
871 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
874 static int machine_constraints_voltage(struct regulator_dev *rdev,
875 struct regulation_constraints *constraints)
877 const struct regulator_ops *ops = rdev->desc->ops;
880 /* do we need to apply the constraint voltage */
881 if (rdev->constraints->apply_uV &&
882 rdev->constraints->min_uV && rdev->constraints->max_uV) {
883 int target_min, target_max;
884 int current_uV = _regulator_get_voltage(rdev);
885 if (current_uV < 0) {
887 "failed to get the current voltage(%d)\n",
893 * If we're below the minimum voltage move up to the
894 * minimum voltage, if we're above the maximum voltage
895 * then move down to the maximum.
897 target_min = current_uV;
898 target_max = current_uV;
900 if (current_uV < rdev->constraints->min_uV) {
901 target_min = rdev->constraints->min_uV;
902 target_max = rdev->constraints->min_uV;
905 if (current_uV > rdev->constraints->max_uV) {
906 target_min = rdev->constraints->max_uV;
907 target_max = rdev->constraints->max_uV;
910 if (target_min != current_uV || target_max != current_uV) {
911 rdev_info(rdev, "Bringing %duV into %d-%duV\n",
912 current_uV, target_min, target_max);
913 ret = _regulator_do_set_voltage(
914 rdev, target_min, target_max);
917 "failed to apply %d-%duV constraint(%d)\n",
918 target_min, target_max, ret);
924 /* constrain machine-level voltage specs to fit
925 * the actual range supported by this regulator.
927 if (ops->list_voltage && rdev->desc->n_voltages) {
928 int count = rdev->desc->n_voltages;
930 int min_uV = INT_MAX;
931 int max_uV = INT_MIN;
932 int cmin = constraints->min_uV;
933 int cmax = constraints->max_uV;
935 /* it's safe to autoconfigure fixed-voltage supplies
936 and the constraints are used by list_voltage. */
937 if (count == 1 && !cmin) {
940 constraints->min_uV = cmin;
941 constraints->max_uV = cmax;
944 /* voltage constraints are optional */
945 if ((cmin == 0) && (cmax == 0))
948 /* else require explicit machine-level constraints */
949 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
950 rdev_err(rdev, "invalid voltage constraints\n");
954 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
955 for (i = 0; i < count; i++) {
958 value = ops->list_voltage(rdev, i);
962 /* maybe adjust [min_uV..max_uV] */
963 if (value >= cmin && value < min_uV)
965 if (value <= cmax && value > max_uV)
969 /* final: [min_uV..max_uV] valid iff constraints valid */
970 if (max_uV < min_uV) {
972 "unsupportable voltage constraints %u-%uuV\n",
977 /* use regulator's subset of machine constraints */
978 if (constraints->min_uV < min_uV) {
979 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
980 constraints->min_uV, min_uV);
981 constraints->min_uV = min_uV;
983 if (constraints->max_uV > max_uV) {
984 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
985 constraints->max_uV, max_uV);
986 constraints->max_uV = max_uV;
993 static int machine_constraints_current(struct regulator_dev *rdev,
994 struct regulation_constraints *constraints)
996 const struct regulator_ops *ops = rdev->desc->ops;
999 if (!constraints->min_uA && !constraints->max_uA)
1002 if (constraints->min_uA > constraints->max_uA) {
1003 rdev_err(rdev, "Invalid current constraints\n");
1007 if (!ops->set_current_limit || !ops->get_current_limit) {
1008 rdev_warn(rdev, "Operation of current configuration missing\n");
1012 /* Set regulator current in constraints range */
1013 ret = ops->set_current_limit(rdev, constraints->min_uA,
1014 constraints->max_uA);
1016 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1023 static int _regulator_do_enable(struct regulator_dev *rdev);
1026 * set_machine_constraints - sets regulator constraints
1027 * @rdev: regulator source
1029 * Allows platform initialisation code to define and constrain
1030 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1031 * Constraints *must* be set by platform code in order for some
1032 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1035 static int set_machine_constraints(struct regulator_dev *rdev)
1038 const struct regulator_ops *ops = rdev->desc->ops;
1040 ret = machine_constraints_voltage(rdev, rdev->constraints);
1044 ret = machine_constraints_current(rdev, rdev->constraints);
1048 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1049 ret = ops->set_input_current_limit(rdev,
1050 rdev->constraints->ilim_uA);
1052 rdev_err(rdev, "failed to set input limit\n");
1057 /* do we need to setup our suspend state */
1058 if (rdev->constraints->initial_state) {
1059 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1061 rdev_err(rdev, "failed to set suspend state\n");
1066 if (rdev->constraints->initial_mode) {
1067 if (!ops->set_mode) {
1068 rdev_err(rdev, "no set_mode operation\n");
1072 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1074 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1079 /* If the constraints say the regulator should be on at this point
1080 * and we have control then make sure it is enabled.
1082 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1083 ret = _regulator_do_enable(rdev);
1084 if (ret < 0 && ret != -EINVAL) {
1085 rdev_err(rdev, "failed to enable\n");
1090 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1091 && ops->set_ramp_delay) {
1092 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1094 rdev_err(rdev, "failed to set ramp_delay\n");
1099 if (rdev->constraints->pull_down && ops->set_pull_down) {
1100 ret = ops->set_pull_down(rdev);
1102 rdev_err(rdev, "failed to set pull down\n");
1107 if (rdev->constraints->soft_start && ops->set_soft_start) {
1108 ret = ops->set_soft_start(rdev);
1110 rdev_err(rdev, "failed to set soft start\n");
1115 if (rdev->constraints->over_current_protection
1116 && ops->set_over_current_protection) {
1117 ret = ops->set_over_current_protection(rdev);
1119 rdev_err(rdev, "failed to set over current protection\n");
1124 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1125 bool ad_state = (rdev->constraints->active_discharge ==
1126 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1128 ret = ops->set_active_discharge(rdev, ad_state);
1130 rdev_err(rdev, "failed to set active discharge\n");
1135 print_constraints(rdev);
1140 * set_supply - set regulator supply regulator
1141 * @rdev: regulator name
1142 * @supply_rdev: supply regulator name
1144 * Called by platform initialisation code to set the supply regulator for this
1145 * regulator. This ensures that a regulators supply will also be enabled by the
1146 * core if it's child is enabled.
1148 static int set_supply(struct regulator_dev *rdev,
1149 struct regulator_dev *supply_rdev)
1153 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1155 if (!try_module_get(supply_rdev->owner))
1158 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1159 if (rdev->supply == NULL) {
1163 supply_rdev->open_count++;
1169 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1170 * @rdev: regulator source
1171 * @consumer_dev_name: dev_name() string for device supply applies to
1172 * @supply: symbolic name for supply
1174 * Allows platform initialisation code to map physical regulator
1175 * sources to symbolic names for supplies for use by devices. Devices
1176 * should use these symbolic names to request regulators, avoiding the
1177 * need to provide board-specific regulator names as platform data.
1179 static int set_consumer_device_supply(struct regulator_dev *rdev,
1180 const char *consumer_dev_name,
1183 struct regulator_map *node, *new_node;
1189 if (consumer_dev_name != NULL)
1194 new_node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1195 if (new_node == NULL)
1198 new_node->regulator = rdev;
1199 new_node->supply = supply;
1202 new_node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1203 if (new_node->dev_name == NULL) {
1209 mutex_lock(®ulator_list_mutex);
1210 list_for_each_entry(node, ®ulator_map_list, list) {
1211 if (node->dev_name && consumer_dev_name) {
1212 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1214 } else if (node->dev_name || consumer_dev_name) {
1218 if (strcmp(node->supply, supply) != 0)
1221 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1223 dev_name(&node->regulator->dev),
1224 node->regulator->desc->name,
1226 dev_name(&rdev->dev), rdev_get_name(rdev));
1230 list_add(&new_node->list, ®ulator_map_list);
1231 mutex_unlock(®ulator_list_mutex);
1236 mutex_unlock(®ulator_list_mutex);
1237 kfree(new_node->dev_name);
1242 static void unset_regulator_supplies(struct regulator_dev *rdev)
1244 struct regulator_map *node, *n;
1246 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1247 if (rdev == node->regulator) {
1248 list_del(&node->list);
1249 kfree(node->dev_name);
1255 #ifdef CONFIG_DEBUG_FS
1256 static ssize_t constraint_flags_read_file(struct file *file,
1257 char __user *user_buf,
1258 size_t count, loff_t *ppos)
1260 const struct regulator *regulator = file->private_data;
1261 const struct regulation_constraints *c = regulator->rdev->constraints;
1268 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1272 ret = snprintf(buf, PAGE_SIZE,
1276 "ramp_disable: %u\n"
1279 "over_current_protection: %u\n",
1286 c->over_current_protection);
1288 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1296 static const struct file_operations constraint_flags_fops = {
1297 #ifdef CONFIG_DEBUG_FS
1298 .open = simple_open,
1299 .read = constraint_flags_read_file,
1300 .llseek = default_llseek,
1304 #define REG_STR_SIZE 64
1306 static struct regulator *create_regulator(struct regulator_dev *rdev,
1308 const char *supply_name)
1310 struct regulator *regulator;
1311 char buf[REG_STR_SIZE];
1314 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1315 if (regulator == NULL)
1318 mutex_lock(&rdev->mutex);
1319 regulator->rdev = rdev;
1320 list_add(®ulator->list, &rdev->consumer_list);
1323 regulator->dev = dev;
1325 /* Add a link to the device sysfs entry */
1326 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1327 dev->kobj.name, supply_name);
1328 if (size >= REG_STR_SIZE)
1331 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1332 if (regulator->supply_name == NULL)
1335 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1338 rdev_dbg(rdev, "could not add device link %s err %d\n",
1339 dev->kobj.name, err);
1343 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1344 if (regulator->supply_name == NULL)
1348 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1350 if (!regulator->debugfs) {
1351 rdev_dbg(rdev, "Failed to create debugfs directory\n");
1353 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1354 ®ulator->uA_load);
1355 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1356 ®ulator->min_uV);
1357 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1358 ®ulator->max_uV);
1359 debugfs_create_file("constraint_flags", 0444,
1360 regulator->debugfs, regulator,
1361 &constraint_flags_fops);
1365 * Check now if the regulator is an always on regulator - if
1366 * it is then we don't need to do nearly so much work for
1367 * enable/disable calls.
1369 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) &&
1370 _regulator_is_enabled(rdev))
1371 regulator->always_on = true;
1373 mutex_unlock(&rdev->mutex);
1376 list_del(®ulator->list);
1378 mutex_unlock(&rdev->mutex);
1382 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1384 if (rdev->constraints && rdev->constraints->enable_time)
1385 return rdev->constraints->enable_time;
1386 if (!rdev->desc->ops->enable_time)
1387 return rdev->desc->enable_time;
1388 return rdev->desc->ops->enable_time(rdev);
1391 static struct regulator_supply_alias *regulator_find_supply_alias(
1392 struct device *dev, const char *supply)
1394 struct regulator_supply_alias *map;
1396 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1397 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1403 static void regulator_supply_alias(struct device **dev, const char **supply)
1405 struct regulator_supply_alias *map;
1407 map = regulator_find_supply_alias(*dev, *supply);
1409 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1410 *supply, map->alias_supply,
1411 dev_name(map->alias_dev));
1412 *dev = map->alias_dev;
1413 *supply = map->alias_supply;
1417 static int of_node_match(struct device *dev, const void *data)
1419 return dev->of_node == data;
1422 static struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
1426 dev = class_find_device(®ulator_class, NULL, np, of_node_match);
1428 return dev ? dev_to_rdev(dev) : NULL;
1431 static int regulator_match(struct device *dev, const void *data)
1433 struct regulator_dev *r = dev_to_rdev(dev);
1435 return strcmp(rdev_get_name(r), data) == 0;
1438 static struct regulator_dev *regulator_lookup_by_name(const char *name)
1442 dev = class_find_device(®ulator_class, NULL, name, regulator_match);
1444 return dev ? dev_to_rdev(dev) : NULL;
1448 * regulator_dev_lookup - lookup a regulator device.
1449 * @dev: device for regulator "consumer".
1450 * @supply: Supply name or regulator ID.
1451 * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if
1452 * lookup could succeed in the future.
1454 * If successful, returns a struct regulator_dev that corresponds to the name
1455 * @supply and with the embedded struct device refcount incremented by one,
1456 * or NULL on failure. The refcount must be dropped by calling put_device().
1458 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1462 struct regulator_dev *r;
1463 struct device_node *node;
1464 struct regulator_map *map;
1465 const char *devname = NULL;
1467 regulator_supply_alias(&dev, &supply);
1469 /* first do a dt based lookup */
1470 if (dev && dev->of_node) {
1471 node = of_get_regulator(dev, supply);
1473 r = of_find_regulator_by_node(node);
1476 *ret = -EPROBE_DEFER;
1480 * If we couldn't even get the node then it's
1481 * not just that the device didn't register
1482 * yet, there's no node and we'll never
1489 /* if not found, try doing it non-dt way */
1491 devname = dev_name(dev);
1493 r = regulator_lookup_by_name(supply);
1497 mutex_lock(®ulator_list_mutex);
1498 list_for_each_entry(map, ®ulator_map_list, list) {
1499 /* If the mapping has a device set up it must match */
1500 if (map->dev_name &&
1501 (!devname || strcmp(map->dev_name, devname)))
1504 if (strcmp(map->supply, supply) == 0 &&
1505 get_device(&map->regulator->dev)) {
1506 mutex_unlock(®ulator_list_mutex);
1507 return map->regulator;
1510 mutex_unlock(®ulator_list_mutex);
1515 static int regulator_resolve_supply(struct regulator_dev *rdev)
1517 struct regulator_dev *r;
1518 struct device *dev = rdev->dev.parent;
1521 /* No supply to resovle? */
1522 if (!rdev->supply_name)
1525 /* Supply already resolved? */
1529 r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
1531 if (ret == -ENODEV) {
1533 * No supply was specified for this regulator and
1534 * there will never be one.
1539 /* Did the lookup explicitly defer for us? */
1540 if (ret == -EPROBE_DEFER)
1543 if (have_full_constraints()) {
1544 r = dummy_regulator_rdev;
1545 get_device(&r->dev);
1547 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1548 rdev->supply_name, rdev->desc->name);
1549 return -EPROBE_DEFER;
1554 dev_err(dev, "Supply for %s (%s) resolved to itself\n",
1555 rdev->desc->name, rdev->supply_name);
1556 if (!have_full_constraints())
1558 r = dummy_regulator_rdev;
1559 get_device(&r->dev);
1562 /* Recursively resolve the supply of the supply */
1563 ret = regulator_resolve_supply(r);
1565 put_device(&r->dev);
1569 ret = set_supply(rdev, r);
1571 put_device(&r->dev);
1575 /* Cascade always-on state to supply */
1576 if (_regulator_is_enabled(rdev)) {
1577 ret = regulator_enable(rdev->supply);
1579 _regulator_put(rdev->supply);
1580 rdev->supply = NULL;
1588 /* Internal regulator request function */
1589 static struct regulator *_regulator_get(struct device *dev, const char *id,
1590 bool exclusive, bool allow_dummy)
1592 struct regulator_dev *rdev;
1593 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1594 const char *devname = NULL;
1598 pr_err("get() with no identifier\n");
1599 return ERR_PTR(-EINVAL);
1603 devname = dev_name(dev);
1605 if (have_full_constraints())
1608 ret = -EPROBE_DEFER;
1610 rdev = regulator_dev_lookup(dev, id, &ret);
1614 regulator = ERR_PTR(ret);
1617 * If we have return value from dev_lookup fail, we do not expect to
1618 * succeed, so, quit with appropriate error value
1620 if (ret && ret != -ENODEV)
1624 devname = "deviceless";
1627 * Assume that a regulator is physically present and enabled
1628 * even if it isn't hooked up and just provide a dummy.
1630 if (have_full_constraints() && allow_dummy) {
1631 pr_warn("%s supply %s not found, using dummy regulator\n",
1634 rdev = dummy_regulator_rdev;
1635 get_device(&rdev->dev);
1637 /* Don't log an error when called from regulator_get_optional() */
1638 } else if (!have_full_constraints() || exclusive) {
1639 dev_warn(dev, "dummy supplies not allowed\n");
1645 if (rdev->exclusive) {
1646 regulator = ERR_PTR(-EPERM);
1647 put_device(&rdev->dev);
1651 if (exclusive && rdev->open_count) {
1652 regulator = ERR_PTR(-EBUSY);
1653 put_device(&rdev->dev);
1657 ret = regulator_resolve_supply(rdev);
1659 regulator = ERR_PTR(ret);
1660 put_device(&rdev->dev);
1664 if (!try_module_get(rdev->owner)) {
1665 put_device(&rdev->dev);
1669 regulator = create_regulator(rdev, dev, id);
1670 if (regulator == NULL) {
1671 regulator = ERR_PTR(-ENOMEM);
1672 put_device(&rdev->dev);
1673 module_put(rdev->owner);
1679 rdev->exclusive = 1;
1681 ret = _regulator_is_enabled(rdev);
1683 rdev->use_count = 1;
1685 rdev->use_count = 0;
1692 * regulator_get - lookup and obtain a reference to a regulator.
1693 * @dev: device for regulator "consumer"
1694 * @id: Supply name or regulator ID.
1696 * Returns a struct regulator corresponding to the regulator producer,
1697 * or IS_ERR() condition containing errno.
1699 * Use of supply names configured via regulator_set_device_supply() is
1700 * strongly encouraged. It is recommended that the supply name used
1701 * should match the name used for the supply and/or the relevant
1702 * device pins in the datasheet.
1704 struct regulator *regulator_get(struct device *dev, const char *id)
1706 return _regulator_get(dev, id, false, true);
1708 EXPORT_SYMBOL_GPL(regulator_get);
1711 * regulator_get_exclusive - obtain exclusive access to a regulator.
1712 * @dev: device for regulator "consumer"
1713 * @id: Supply name or regulator ID.
1715 * Returns a struct regulator corresponding to the regulator producer,
1716 * or IS_ERR() condition containing errno. Other consumers will be
1717 * unable to obtain this regulator while this reference is held and the
1718 * use count for the regulator will be initialised to reflect the current
1719 * state of the regulator.
1721 * This is intended for use by consumers which cannot tolerate shared
1722 * use of the regulator such as those which need to force the
1723 * regulator off for correct operation of the hardware they are
1726 * Use of supply names configured via regulator_set_device_supply() is
1727 * strongly encouraged. It is recommended that the supply name used
1728 * should match the name used for the supply and/or the relevant
1729 * device pins in the datasheet.
1731 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1733 return _regulator_get(dev, id, true, false);
1735 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1738 * regulator_get_optional - obtain optional access to a regulator.
1739 * @dev: device for regulator "consumer"
1740 * @id: Supply name or regulator ID.
1742 * Returns a struct regulator corresponding to the regulator producer,
1743 * or IS_ERR() condition containing errno.
1745 * This is intended for use by consumers for devices which can have
1746 * some supplies unconnected in normal use, such as some MMC devices.
1747 * It can allow the regulator core to provide stub supplies for other
1748 * supplies requested using normal regulator_get() calls without
1749 * disrupting the operation of drivers that can handle absent
1752 * Use of supply names configured via regulator_set_device_supply() is
1753 * strongly encouraged. It is recommended that the supply name used
1754 * should match the name used for the supply and/or the relevant
1755 * device pins in the datasheet.
1757 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1759 return _regulator_get(dev, id, false, false);
1761 EXPORT_SYMBOL_GPL(regulator_get_optional);
1763 /* regulator_list_mutex lock held by regulator_put() */
1764 static void _regulator_put(struct regulator *regulator)
1766 struct regulator_dev *rdev;
1768 if (IS_ERR_OR_NULL(regulator))
1771 lockdep_assert_held_once(®ulator_list_mutex);
1773 rdev = regulator->rdev;
1775 debugfs_remove_recursive(regulator->debugfs);
1777 /* remove any sysfs entries */
1779 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1780 mutex_lock(&rdev->mutex);
1781 list_del(®ulator->list);
1784 rdev->exclusive = 0;
1785 put_device(&rdev->dev);
1786 mutex_unlock(&rdev->mutex);
1788 kfree(regulator->supply_name);
1791 module_put(rdev->owner);
1795 * regulator_put - "free" the regulator source
1796 * @regulator: regulator source
1798 * Note: drivers must ensure that all regulator_enable calls made on this
1799 * regulator source are balanced by regulator_disable calls prior to calling
1802 void regulator_put(struct regulator *regulator)
1804 mutex_lock(®ulator_list_mutex);
1805 _regulator_put(regulator);
1806 mutex_unlock(®ulator_list_mutex);
1808 EXPORT_SYMBOL_GPL(regulator_put);
1811 * regulator_register_supply_alias - Provide device alias for supply lookup
1813 * @dev: device that will be given as the regulator "consumer"
1814 * @id: Supply name or regulator ID
1815 * @alias_dev: device that should be used to lookup the supply
1816 * @alias_id: Supply name or regulator ID that should be used to lookup the
1819 * All lookups for id on dev will instead be conducted for alias_id on
1822 int regulator_register_supply_alias(struct device *dev, const char *id,
1823 struct device *alias_dev,
1824 const char *alias_id)
1826 struct regulator_supply_alias *map;
1828 map = regulator_find_supply_alias(dev, id);
1832 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1837 map->src_supply = id;
1838 map->alias_dev = alias_dev;
1839 map->alias_supply = alias_id;
1841 list_add(&map->list, ®ulator_supply_alias_list);
1843 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1844 id, dev_name(dev), alias_id, dev_name(alias_dev));
1848 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1851 * regulator_unregister_supply_alias - Remove device alias
1853 * @dev: device that will be given as the regulator "consumer"
1854 * @id: Supply name or regulator ID
1856 * Remove a lookup alias if one exists for id on dev.
1858 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1860 struct regulator_supply_alias *map;
1862 map = regulator_find_supply_alias(dev, id);
1864 list_del(&map->list);
1868 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1871 * regulator_bulk_register_supply_alias - register multiple aliases
1873 * @dev: device that will be given as the regulator "consumer"
1874 * @id: List of supply names or regulator IDs
1875 * @alias_dev: device that should be used to lookup the supply
1876 * @alias_id: List of supply names or regulator IDs that should be used to
1878 * @num_id: Number of aliases to register
1880 * @return 0 on success, an errno on failure.
1882 * This helper function allows drivers to register several supply
1883 * aliases in one operation. If any of the aliases cannot be
1884 * registered any aliases that were registered will be removed
1885 * before returning to the caller.
1887 int regulator_bulk_register_supply_alias(struct device *dev,
1888 const char *const *id,
1889 struct device *alias_dev,
1890 const char *const *alias_id,
1896 for (i = 0; i < num_id; ++i) {
1897 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1907 "Failed to create supply alias %s,%s -> %s,%s\n",
1908 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1911 regulator_unregister_supply_alias(dev, id[i]);
1915 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1918 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1920 * @dev: device that will be given as the regulator "consumer"
1921 * @id: List of supply names or regulator IDs
1922 * @num_id: Number of aliases to unregister
1924 * This helper function allows drivers to unregister several supply
1925 * aliases in one operation.
1927 void regulator_bulk_unregister_supply_alias(struct device *dev,
1928 const char *const *id,
1933 for (i = 0; i < num_id; ++i)
1934 regulator_unregister_supply_alias(dev, id[i]);
1936 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1939 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1940 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1941 const struct regulator_config *config)
1943 struct regulator_enable_gpio *pin;
1944 struct gpio_desc *gpiod;
1947 gpiod = gpio_to_desc(config->ena_gpio);
1949 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1950 if (pin->gpiod == gpiod) {
1951 rdev_dbg(rdev, "GPIO %d is already used\n",
1953 goto update_ena_gpio_to_rdev;
1957 ret = gpio_request_one(config->ena_gpio,
1958 GPIOF_DIR_OUT | config->ena_gpio_flags,
1959 rdev_get_name(rdev));
1963 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1965 gpio_free(config->ena_gpio);
1970 pin->ena_gpio_invert = config->ena_gpio_invert;
1971 list_add(&pin->list, ®ulator_ena_gpio_list);
1973 update_ena_gpio_to_rdev:
1974 pin->request_count++;
1975 rdev->ena_pin = pin;
1979 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1981 struct regulator_enable_gpio *pin, *n;
1986 /* Free the GPIO only in case of no use */
1987 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
1988 if (pin->gpiod == rdev->ena_pin->gpiod) {
1989 if (pin->request_count <= 1) {
1990 pin->request_count = 0;
1991 gpiod_put(pin->gpiod);
1992 list_del(&pin->list);
1994 rdev->ena_pin = NULL;
1997 pin->request_count--;
2004 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
2005 * @rdev: regulator_dev structure
2006 * @enable: enable GPIO at initial use?
2008 * GPIO is enabled in case of initial use. (enable_count is 0)
2009 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2011 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
2013 struct regulator_enable_gpio *pin = rdev->ena_pin;
2019 /* Enable GPIO at initial use */
2020 if (pin->enable_count == 0)
2021 gpiod_set_value_cansleep(pin->gpiod,
2022 !pin->ena_gpio_invert);
2024 pin->enable_count++;
2026 if (pin->enable_count > 1) {
2027 pin->enable_count--;
2031 /* Disable GPIO if not used */
2032 if (pin->enable_count <= 1) {
2033 gpiod_set_value_cansleep(pin->gpiod,
2034 pin->ena_gpio_invert);
2035 pin->enable_count = 0;
2043 * _regulator_enable_delay - a delay helper function
2044 * @delay: time to delay in microseconds
2046 * Delay for the requested amount of time as per the guidelines in:
2048 * Documentation/timers/timers-howto.txt
2050 * The assumption here is that regulators will never be enabled in
2051 * atomic context and therefore sleeping functions can be used.
2053 static void _regulator_enable_delay(unsigned int delay)
2055 unsigned int ms = delay / 1000;
2056 unsigned int us = delay % 1000;
2060 * For small enough values, handle super-millisecond
2061 * delays in the usleep_range() call below.
2070 * Give the scheduler some room to coalesce with any other
2071 * wakeup sources. For delays shorter than 10 us, don't even
2072 * bother setting up high-resolution timers and just busy-
2076 usleep_range(us, us + 100);
2081 static int _regulator_do_enable(struct regulator_dev *rdev)
2085 /* Query before enabling in case configuration dependent. */
2086 ret = _regulator_get_enable_time(rdev);
2090 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2094 trace_regulator_enable(rdev_get_name(rdev));
2096 if (rdev->desc->off_on_delay) {
2097 /* if needed, keep a distance of off_on_delay from last time
2098 * this regulator was disabled.
2100 unsigned long start_jiffy = jiffies;
2101 unsigned long intended, max_delay, remaining;
2103 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2104 intended = rdev->last_off_jiffy + max_delay;
2106 if (time_before(start_jiffy, intended)) {
2107 /* calc remaining jiffies to deal with one-time
2109 * in case of multiple timer wrapping, either it can be
2110 * detected by out-of-range remaining, or it cannot be
2111 * detected and we gets a panelty of
2112 * _regulator_enable_delay().
2114 remaining = intended - start_jiffy;
2115 if (remaining <= max_delay)
2116 _regulator_enable_delay(
2117 jiffies_to_usecs(remaining));
2121 if (rdev->ena_pin) {
2122 if (!rdev->ena_gpio_state) {
2123 ret = regulator_ena_gpio_ctrl(rdev, true);
2126 rdev->ena_gpio_state = 1;
2128 } else if (rdev->desc->ops->enable) {
2129 ret = rdev->desc->ops->enable(rdev);
2136 /* Allow the regulator to ramp; it would be useful to extend
2137 * this for bulk operations so that the regulators can ramp
2139 trace_regulator_enable_delay(rdev_get_name(rdev));
2141 _regulator_enable_delay(delay);
2143 trace_regulator_enable_complete(rdev_get_name(rdev));
2148 /* locks held by regulator_enable() */
2149 static int _regulator_enable(struct regulator_dev *rdev)
2153 lockdep_assert_held_once(&rdev->mutex);
2155 /* check voltage and requested load before enabling */
2156 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2157 drms_uA_update(rdev);
2159 if (rdev->use_count == 0) {
2160 /* The regulator may on if it's not switchable or left on */
2161 ret = _regulator_is_enabled(rdev);
2162 if (ret == -EINVAL || ret == 0) {
2163 if (!regulator_ops_is_valid(rdev,
2164 REGULATOR_CHANGE_STATUS))
2167 ret = _regulator_do_enable(rdev);
2171 } else if (ret < 0) {
2172 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
2175 /* Fallthrough on positive return values - already enabled */
2184 * regulator_enable - enable regulator output
2185 * @regulator: regulator source
2187 * Request that the regulator be enabled with the regulator output at
2188 * the predefined voltage or current value. Calls to regulator_enable()
2189 * must be balanced with calls to regulator_disable().
2191 * NOTE: the output value can be set by other drivers, boot loader or may be
2192 * hardwired in the regulator.
2194 int regulator_enable(struct regulator *regulator)
2196 struct regulator_dev *rdev = regulator->rdev;
2199 if (regulator->always_on)
2203 ret = regulator_enable(rdev->supply);
2208 mutex_lock(&rdev->mutex);
2209 ret = _regulator_enable(rdev);
2210 mutex_unlock(&rdev->mutex);
2212 if (ret != 0 && rdev->supply)
2213 regulator_disable(rdev->supply);
2217 EXPORT_SYMBOL_GPL(regulator_enable);
2219 static int _regulator_do_disable(struct regulator_dev *rdev)
2223 trace_regulator_disable(rdev_get_name(rdev));
2225 if (rdev->ena_pin) {
2226 if (rdev->ena_gpio_state) {
2227 ret = regulator_ena_gpio_ctrl(rdev, false);
2230 rdev->ena_gpio_state = 0;
2233 } else if (rdev->desc->ops->disable) {
2234 ret = rdev->desc->ops->disable(rdev);
2239 /* cares about last_off_jiffy only if off_on_delay is required by
2242 if (rdev->desc->off_on_delay)
2243 rdev->last_off_jiffy = jiffies;
2245 trace_regulator_disable_complete(rdev_get_name(rdev));
2250 /* locks held by regulator_disable() */
2251 static int _regulator_disable(struct regulator_dev *rdev)
2255 lockdep_assert_held_once(&rdev->mutex);
2257 if (WARN(rdev->use_count <= 0,
2258 "unbalanced disables for %s\n", rdev_get_name(rdev)))
2261 /* are we the last user and permitted to disable ? */
2262 if (rdev->use_count == 1 &&
2263 (rdev->constraints && !rdev->constraints->always_on)) {
2265 /* we are last user */
2266 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
2267 ret = _notifier_call_chain(rdev,
2268 REGULATOR_EVENT_PRE_DISABLE,
2270 if (ret & NOTIFY_STOP_MASK)
2273 ret = _regulator_do_disable(rdev);
2275 rdev_err(rdev, "failed to disable\n");
2276 _notifier_call_chain(rdev,
2277 REGULATOR_EVENT_ABORT_DISABLE,
2281 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2285 rdev->use_count = 0;
2286 } else if (rdev->use_count > 1) {
2287 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2288 drms_uA_update(rdev);
2297 * regulator_disable - disable regulator output
2298 * @regulator: regulator source
2300 * Disable the regulator output voltage or current. Calls to
2301 * regulator_enable() must be balanced with calls to
2302 * regulator_disable().
2304 * NOTE: this will only disable the regulator output if no other consumer
2305 * devices have it enabled, the regulator device supports disabling and
2306 * machine constraints permit this operation.
2308 int regulator_disable(struct regulator *regulator)
2310 struct regulator_dev *rdev = regulator->rdev;
2313 if (regulator->always_on)
2316 mutex_lock(&rdev->mutex);
2317 ret = _regulator_disable(rdev);
2318 mutex_unlock(&rdev->mutex);
2320 if (ret == 0 && rdev->supply)
2321 regulator_disable(rdev->supply);
2325 EXPORT_SYMBOL_GPL(regulator_disable);
2327 /* locks held by regulator_force_disable() */
2328 static int _regulator_force_disable(struct regulator_dev *rdev)
2332 lockdep_assert_held_once(&rdev->mutex);
2334 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2335 REGULATOR_EVENT_PRE_DISABLE, NULL);
2336 if (ret & NOTIFY_STOP_MASK)
2339 ret = _regulator_do_disable(rdev);
2341 rdev_err(rdev, "failed to force disable\n");
2342 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2343 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2347 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2348 REGULATOR_EVENT_DISABLE, NULL);
2354 * regulator_force_disable - force disable regulator output
2355 * @regulator: regulator source
2357 * Forcibly disable the regulator output voltage or current.
2358 * NOTE: this *will* disable the regulator output even if other consumer
2359 * devices have it enabled. This should be used for situations when device
2360 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2362 int regulator_force_disable(struct regulator *regulator)
2364 struct regulator_dev *rdev = regulator->rdev;
2367 mutex_lock(&rdev->mutex);
2368 regulator->uA_load = 0;
2369 ret = _regulator_force_disable(regulator->rdev);
2370 mutex_unlock(&rdev->mutex);
2373 while (rdev->open_count--)
2374 regulator_disable(rdev->supply);
2378 EXPORT_SYMBOL_GPL(regulator_force_disable);
2380 static void regulator_disable_work(struct work_struct *work)
2382 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2386 mutex_lock(&rdev->mutex);
2388 BUG_ON(!rdev->deferred_disables);
2390 count = rdev->deferred_disables;
2391 rdev->deferred_disables = 0;
2393 for (i = 0; i < count; i++) {
2394 ret = _regulator_disable(rdev);
2396 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2399 mutex_unlock(&rdev->mutex);
2402 for (i = 0; i < count; i++) {
2403 ret = regulator_disable(rdev->supply);
2406 "Supply disable failed: %d\n", ret);
2413 * regulator_disable_deferred - disable regulator output with delay
2414 * @regulator: regulator source
2415 * @ms: miliseconds until the regulator is disabled
2417 * Execute regulator_disable() on the regulator after a delay. This
2418 * is intended for use with devices that require some time to quiesce.
2420 * NOTE: this will only disable the regulator output if no other consumer
2421 * devices have it enabled, the regulator device supports disabling and
2422 * machine constraints permit this operation.
2424 int regulator_disable_deferred(struct regulator *regulator, int ms)
2426 struct regulator_dev *rdev = regulator->rdev;
2428 if (regulator->always_on)
2432 return regulator_disable(regulator);
2434 mutex_lock(&rdev->mutex);
2435 rdev->deferred_disables++;
2436 mutex_unlock(&rdev->mutex);
2438 queue_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2439 msecs_to_jiffies(ms));
2442 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2444 static int _regulator_is_enabled(struct regulator_dev *rdev)
2446 /* A GPIO control always takes precedence */
2448 return rdev->ena_gpio_state;
2450 /* If we don't know then assume that the regulator is always on */
2451 if (!rdev->desc->ops->is_enabled)
2454 return rdev->desc->ops->is_enabled(rdev);
2457 static int _regulator_list_voltage(struct regulator *regulator,
2458 unsigned selector, int lock)
2460 struct regulator_dev *rdev = regulator->rdev;
2461 const struct regulator_ops *ops = rdev->desc->ops;
2464 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2465 return rdev->desc->fixed_uV;
2467 if (ops->list_voltage) {
2468 if (selector >= rdev->desc->n_voltages)
2471 mutex_lock(&rdev->mutex);
2472 ret = ops->list_voltage(rdev, selector);
2474 mutex_unlock(&rdev->mutex);
2475 } else if (rdev->is_switch && rdev->supply) {
2476 ret = _regulator_list_voltage(rdev->supply, selector, lock);
2482 if (ret < rdev->constraints->min_uV)
2484 else if (ret > rdev->constraints->max_uV)
2492 * regulator_is_enabled - is the regulator output enabled
2493 * @regulator: regulator source
2495 * Returns positive if the regulator driver backing the source/client
2496 * has requested that the device be enabled, zero if it hasn't, else a
2497 * negative errno code.
2499 * Note that the device backing this regulator handle can have multiple
2500 * users, so it might be enabled even if regulator_enable() was never
2501 * called for this particular source.
2503 int regulator_is_enabled(struct regulator *regulator)
2507 if (regulator->always_on)
2510 mutex_lock(®ulator->rdev->mutex);
2511 ret = _regulator_is_enabled(regulator->rdev);
2512 mutex_unlock(®ulator->rdev->mutex);
2516 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2519 * regulator_count_voltages - count regulator_list_voltage() selectors
2520 * @regulator: regulator source
2522 * Returns number of selectors, or negative errno. Selectors are
2523 * numbered starting at zero, and typically correspond to bitfields
2524 * in hardware registers.
2526 int regulator_count_voltages(struct regulator *regulator)
2528 struct regulator_dev *rdev = regulator->rdev;
2530 if (rdev->desc->n_voltages)
2531 return rdev->desc->n_voltages;
2533 if (!rdev->is_switch || !rdev->supply)
2536 return regulator_count_voltages(rdev->supply);
2538 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2541 * regulator_list_voltage - enumerate supported voltages
2542 * @regulator: regulator source
2543 * @selector: identify voltage to list
2544 * Context: can sleep
2546 * Returns a voltage that can be passed to @regulator_set_voltage(),
2547 * zero if this selector code can't be used on this system, or a
2550 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2552 return _regulator_list_voltage(regulator, selector, 1);
2554 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2557 * regulator_get_regmap - get the regulator's register map
2558 * @regulator: regulator source
2560 * Returns the register map for the given regulator, or an ERR_PTR value
2561 * if the regulator doesn't use regmap.
2563 struct regmap *regulator_get_regmap(struct regulator *regulator)
2565 struct regmap *map = regulator->rdev->regmap;
2567 return map ? map : ERR_PTR(-EOPNOTSUPP);
2571 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2572 * @regulator: regulator source
2573 * @vsel_reg: voltage selector register, output parameter
2574 * @vsel_mask: mask for voltage selector bitfield, output parameter
2576 * Returns the hardware register offset and bitmask used for setting the
2577 * regulator voltage. This might be useful when configuring voltage-scaling
2578 * hardware or firmware that can make I2C requests behind the kernel's back,
2581 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2582 * and 0 is returned, otherwise a negative errno is returned.
2584 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2586 unsigned *vsel_mask)
2588 struct regulator_dev *rdev = regulator->rdev;
2589 const struct regulator_ops *ops = rdev->desc->ops;
2591 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2594 *vsel_reg = rdev->desc->vsel_reg;
2595 *vsel_mask = rdev->desc->vsel_mask;
2599 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2602 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2603 * @regulator: regulator source
2604 * @selector: identify voltage to list
2606 * Converts the selector to a hardware-specific voltage selector that can be
2607 * directly written to the regulator registers. The address of the voltage
2608 * register can be determined by calling @regulator_get_hardware_vsel_register.
2610 * On error a negative errno is returned.
2612 int regulator_list_hardware_vsel(struct regulator *regulator,
2615 struct regulator_dev *rdev = regulator->rdev;
2616 const struct regulator_ops *ops = rdev->desc->ops;
2618 if (selector >= rdev->desc->n_voltages)
2620 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2625 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2628 * regulator_get_linear_step - return the voltage step size between VSEL values
2629 * @regulator: regulator source
2631 * Returns the voltage step size between VSEL values for linear
2632 * regulators, or return 0 if the regulator isn't a linear regulator.
2634 unsigned int regulator_get_linear_step(struct regulator *regulator)
2636 struct regulator_dev *rdev = regulator->rdev;
2638 return rdev->desc->uV_step;
2640 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2643 * regulator_is_supported_voltage - check if a voltage range can be supported
2645 * @regulator: Regulator to check.
2646 * @min_uV: Minimum required voltage in uV.
2647 * @max_uV: Maximum required voltage in uV.
2649 * Returns a boolean or a negative error code.
2651 int regulator_is_supported_voltage(struct regulator *regulator,
2652 int min_uV, int max_uV)
2654 struct regulator_dev *rdev = regulator->rdev;
2655 int i, voltages, ret;
2657 /* If we can't change voltage check the current voltage */
2658 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2659 ret = regulator_get_voltage(regulator);
2661 return min_uV <= ret && ret <= max_uV;
2666 /* Any voltage within constrains range is fine? */
2667 if (rdev->desc->continuous_voltage_range)
2668 return min_uV >= rdev->constraints->min_uV &&
2669 max_uV <= rdev->constraints->max_uV;
2671 ret = regulator_count_voltages(regulator);
2676 for (i = 0; i < voltages; i++) {
2677 ret = regulator_list_voltage(regulator, i);
2679 if (ret >= min_uV && ret <= max_uV)
2685 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2687 static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2690 const struct regulator_desc *desc = rdev->desc;
2692 if (desc->ops->map_voltage)
2693 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2695 if (desc->ops->list_voltage == regulator_list_voltage_linear)
2696 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2698 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2699 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2701 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2704 static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2705 int min_uV, int max_uV,
2708 struct pre_voltage_change_data data;
2711 data.old_uV = _regulator_get_voltage(rdev);
2712 data.min_uV = min_uV;
2713 data.max_uV = max_uV;
2714 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2716 if (ret & NOTIFY_STOP_MASK)
2719 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2723 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2724 (void *)data.old_uV);
2729 static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2730 int uV, unsigned selector)
2732 struct pre_voltage_change_data data;
2735 data.old_uV = _regulator_get_voltage(rdev);
2738 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2740 if (ret & NOTIFY_STOP_MASK)
2743 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2747 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2748 (void *)data.old_uV);
2753 static int _regulator_set_voltage_time(struct regulator_dev *rdev,
2754 int old_uV, int new_uV)
2756 unsigned int ramp_delay = 0;
2758 if (rdev->constraints->ramp_delay)
2759 ramp_delay = rdev->constraints->ramp_delay;
2760 else if (rdev->desc->ramp_delay)
2761 ramp_delay = rdev->desc->ramp_delay;
2763 if (ramp_delay == 0) {
2764 rdev_dbg(rdev, "ramp_delay not set\n");
2768 return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
2771 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2772 int min_uV, int max_uV)
2777 unsigned int selector;
2778 int old_selector = -1;
2779 const struct regulator_ops *ops = rdev->desc->ops;
2780 int old_uV = _regulator_get_voltage(rdev);
2782 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2784 min_uV += rdev->constraints->uV_offset;
2785 max_uV += rdev->constraints->uV_offset;
2788 * If we can't obtain the old selector there is not enough
2789 * info to call set_voltage_time_sel().
2791 if (_regulator_is_enabled(rdev) &&
2792 ops->set_voltage_time_sel && ops->get_voltage_sel) {
2793 old_selector = ops->get_voltage_sel(rdev);
2794 if (old_selector < 0)
2795 return old_selector;
2798 if (ops->set_voltage) {
2799 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2803 if (ops->list_voltage)
2804 best_val = ops->list_voltage(rdev,
2807 best_val = _regulator_get_voltage(rdev);
2810 } else if (ops->set_voltage_sel) {
2811 ret = regulator_map_voltage(rdev, min_uV, max_uV);
2813 best_val = ops->list_voltage(rdev, ret);
2814 if (min_uV <= best_val && max_uV >= best_val) {
2816 if (old_selector == selector)
2819 ret = _regulator_call_set_voltage_sel(
2820 rdev, best_val, selector);
2832 if (ops->set_voltage_time_sel) {
2834 * Call set_voltage_time_sel if successfully obtained
2837 if (old_selector >= 0 && old_selector != selector)
2838 delay = ops->set_voltage_time_sel(rdev, old_selector,
2841 if (old_uV != best_val) {
2842 if (ops->set_voltage_time)
2843 delay = ops->set_voltage_time(rdev, old_uV,
2846 delay = _regulator_set_voltage_time(rdev,
2853 rdev_warn(rdev, "failed to get delay: %d\n", delay);
2857 /* Insert any necessary delays */
2858 if (delay >= 1000) {
2859 mdelay(delay / 1000);
2860 udelay(delay % 1000);
2865 if (best_val >= 0) {
2866 unsigned long data = best_val;
2868 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2873 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2878 static int regulator_set_voltage_unlocked(struct regulator *regulator,
2879 int min_uV, int max_uV)
2881 struct regulator_dev *rdev = regulator->rdev;
2883 int old_min_uV, old_max_uV;
2885 int best_supply_uV = 0;
2886 int supply_change_uV = 0;
2888 /* If we're setting the same range as last time the change
2889 * should be a noop (some cpufreq implementations use the same
2890 * voltage for multiple frequencies, for example).
2892 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2895 /* If we're trying to set a range that overlaps the current voltage,
2896 * return successfully even though the regulator does not support
2897 * changing the voltage.
2899 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2900 current_uV = _regulator_get_voltage(rdev);
2901 if (min_uV <= current_uV && current_uV <= max_uV) {
2902 regulator->min_uV = min_uV;
2903 regulator->max_uV = max_uV;
2909 if (!rdev->desc->ops->set_voltage &&
2910 !rdev->desc->ops->set_voltage_sel) {
2915 /* constraints check */
2916 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2920 /* restore original values in case of error */
2921 old_min_uV = regulator->min_uV;
2922 old_max_uV = regulator->max_uV;
2923 regulator->min_uV = min_uV;
2924 regulator->max_uV = max_uV;
2926 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2930 if (rdev->supply && (rdev->desc->min_dropout_uV ||
2931 !rdev->desc->ops->get_voltage)) {
2932 int current_supply_uV;
2935 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2941 best_supply_uV = _regulator_list_voltage(regulator, selector, 0);
2942 if (best_supply_uV < 0) {
2943 ret = best_supply_uV;
2947 best_supply_uV += rdev->desc->min_dropout_uV;
2949 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2950 if (current_supply_uV < 0) {
2951 ret = current_supply_uV;
2955 supply_change_uV = best_supply_uV - current_supply_uV;
2958 if (supply_change_uV > 0) {
2959 ret = regulator_set_voltage_unlocked(rdev->supply,
2960 best_supply_uV, INT_MAX);
2962 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
2968 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2972 if (supply_change_uV < 0) {
2973 ret = regulator_set_voltage_unlocked(rdev->supply,
2974 best_supply_uV, INT_MAX);
2976 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
2978 /* No need to fail here */
2985 regulator->min_uV = old_min_uV;
2986 regulator->max_uV = old_max_uV;
2992 * regulator_set_voltage - set regulator output voltage
2993 * @regulator: regulator source
2994 * @min_uV: Minimum required voltage in uV
2995 * @max_uV: Maximum acceptable voltage in uV
2997 * Sets a voltage regulator to the desired output voltage. This can be set
2998 * during any regulator state. IOW, regulator can be disabled or enabled.
3000 * If the regulator is enabled then the voltage will change to the new value
3001 * immediately otherwise if the regulator is disabled the regulator will
3002 * output at the new voltage when enabled.
3004 * NOTE: If the regulator is shared between several devices then the lowest
3005 * request voltage that meets the system constraints will be used.
3006 * Regulator system constraints must be set for this regulator before
3007 * calling this function otherwise this call will fail.
3009 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
3013 regulator_lock_supply(regulator->rdev);
3015 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
3017 regulator_unlock_supply(regulator->rdev);
3021 EXPORT_SYMBOL_GPL(regulator_set_voltage);
3024 * regulator_set_voltage_time - get raise/fall time
3025 * @regulator: regulator source
3026 * @old_uV: starting voltage in microvolts
3027 * @new_uV: target voltage in microvolts
3029 * Provided with the starting and ending voltage, this function attempts to
3030 * calculate the time in microseconds required to rise or fall to this new
3033 int regulator_set_voltage_time(struct regulator *regulator,
3034 int old_uV, int new_uV)
3036 struct regulator_dev *rdev = regulator->rdev;
3037 const struct regulator_ops *ops = rdev->desc->ops;
3043 if (ops->set_voltage_time)
3044 return ops->set_voltage_time(rdev, old_uV, new_uV);
3045 else if (!ops->set_voltage_time_sel)
3046 return _regulator_set_voltage_time(rdev, old_uV, new_uV);
3048 /* Currently requires operations to do this */
3049 if (!ops->list_voltage || !rdev->desc->n_voltages)
3052 for (i = 0; i < rdev->desc->n_voltages; i++) {
3053 /* We only look for exact voltage matches here */
3054 voltage = regulator_list_voltage(regulator, i);
3059 if (voltage == old_uV)
3061 if (voltage == new_uV)
3065 if (old_sel < 0 || new_sel < 0)
3068 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3070 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3073 * regulator_set_voltage_time_sel - get raise/fall time
3074 * @rdev: regulator source device
3075 * @old_selector: selector for starting voltage
3076 * @new_selector: selector for target voltage
3078 * Provided with the starting and target voltage selectors, this function
3079 * returns time in microseconds required to rise or fall to this new voltage
3081 * Drivers providing ramp_delay in regulation_constraints can use this as their
3082 * set_voltage_time_sel() operation.
3084 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3085 unsigned int old_selector,
3086 unsigned int new_selector)
3088 int old_volt, new_volt;
3091 if (!rdev->desc->ops->list_voltage)
3094 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3095 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3097 if (rdev->desc->ops->set_voltage_time)
3098 return rdev->desc->ops->set_voltage_time(rdev, old_volt,
3101 return _regulator_set_voltage_time(rdev, old_volt, new_volt);
3103 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
3106 * regulator_sync_voltage - re-apply last regulator output voltage
3107 * @regulator: regulator source
3109 * Re-apply the last configured voltage. This is intended to be used
3110 * where some external control source the consumer is cooperating with
3111 * has caused the configured voltage to change.
3113 int regulator_sync_voltage(struct regulator *regulator)
3115 struct regulator_dev *rdev = regulator->rdev;
3116 int ret, min_uV, max_uV;
3118 mutex_lock(&rdev->mutex);
3120 if (!rdev->desc->ops->set_voltage &&
3121 !rdev->desc->ops->set_voltage_sel) {
3126 /* This is only going to work if we've had a voltage configured. */
3127 if (!regulator->min_uV && !regulator->max_uV) {
3132 min_uV = regulator->min_uV;
3133 max_uV = regulator->max_uV;
3135 /* This should be a paranoia check... */
3136 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3140 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
3144 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3147 mutex_unlock(&rdev->mutex);
3150 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3152 static int _regulator_get_voltage(struct regulator_dev *rdev)
3157 if (rdev->desc->ops->get_bypass) {
3158 ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
3162 /* if bypassed the regulator must have a supply */
3163 if (!rdev->supply) {
3165 "bypassed regulator has no supply!\n");
3166 return -EPROBE_DEFER;
3169 return _regulator_get_voltage(rdev->supply->rdev);
3173 if (rdev->desc->ops->get_voltage_sel) {
3174 sel = rdev->desc->ops->get_voltage_sel(rdev);
3177 ret = rdev->desc->ops->list_voltage(rdev, sel);
3178 } else if (rdev->desc->ops->get_voltage) {
3179 ret = rdev->desc->ops->get_voltage(rdev);
3180 } else if (rdev->desc->ops->list_voltage) {
3181 ret = rdev->desc->ops->list_voltage(rdev, 0);
3182 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3183 ret = rdev->desc->fixed_uV;
3184 } else if (rdev->supply) {
3185 ret = _regulator_get_voltage(rdev->supply->rdev);
3186 } else if (rdev->supply_name) {
3187 return -EPROBE_DEFER;
3194 return ret - rdev->constraints->uV_offset;
3198 * regulator_get_voltage - get regulator output voltage
3199 * @regulator: regulator source
3201 * This returns the current regulator voltage in uV.
3203 * NOTE: If the regulator is disabled it will return the voltage value. This
3204 * function should not be used to determine regulator state.
3206 int regulator_get_voltage(struct regulator *regulator)
3210 regulator_lock_supply(regulator->rdev);
3212 ret = _regulator_get_voltage(regulator->rdev);
3214 regulator_unlock_supply(regulator->rdev);
3218 EXPORT_SYMBOL_GPL(regulator_get_voltage);
3221 * regulator_set_current_limit - set regulator output current limit
3222 * @regulator: regulator source
3223 * @min_uA: Minimum supported current in uA
3224 * @max_uA: Maximum supported current in uA
3226 * Sets current sink to the desired output current. This can be set during
3227 * any regulator state. IOW, regulator can be disabled or enabled.
3229 * If the regulator is enabled then the current will change to the new value
3230 * immediately otherwise if the regulator is disabled the regulator will
3231 * output at the new current when enabled.
3233 * NOTE: Regulator system constraints must be set for this regulator before
3234 * calling this function otherwise this call will fail.
3236 int regulator_set_current_limit(struct regulator *regulator,
3237 int min_uA, int max_uA)
3239 struct regulator_dev *rdev = regulator->rdev;
3242 mutex_lock(&rdev->mutex);
3245 if (!rdev->desc->ops->set_current_limit) {
3250 /* constraints check */
3251 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3255 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3257 mutex_unlock(&rdev->mutex);
3260 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3262 static int _regulator_get_current_limit(struct regulator_dev *rdev)
3266 mutex_lock(&rdev->mutex);
3269 if (!rdev->desc->ops->get_current_limit) {
3274 ret = rdev->desc->ops->get_current_limit(rdev);
3276 mutex_unlock(&rdev->mutex);
3281 * regulator_get_current_limit - get regulator output current
3282 * @regulator: regulator source
3284 * This returns the current supplied by the specified current sink in uA.
3286 * NOTE: If the regulator is disabled it will return the current value. This
3287 * function should not be used to determine regulator state.
3289 int regulator_get_current_limit(struct regulator *regulator)
3291 return _regulator_get_current_limit(regulator->rdev);
3293 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3296 * regulator_set_mode - set regulator operating mode
3297 * @regulator: regulator source
3298 * @mode: operating mode - one of the REGULATOR_MODE constants
3300 * Set regulator operating mode to increase regulator efficiency or improve
3301 * regulation performance.
3303 * NOTE: Regulator system constraints must be set for this regulator before
3304 * calling this function otherwise this call will fail.
3306 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3308 struct regulator_dev *rdev = regulator->rdev;
3310 int regulator_curr_mode;
3312 mutex_lock(&rdev->mutex);
3315 if (!rdev->desc->ops->set_mode) {
3320 /* return if the same mode is requested */
3321 if (rdev->desc->ops->get_mode) {
3322 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3323 if (regulator_curr_mode == mode) {
3329 /* constraints check */
3330 ret = regulator_mode_constrain(rdev, &mode);
3334 ret = rdev->desc->ops->set_mode(rdev, mode);
3336 mutex_unlock(&rdev->mutex);
3339 EXPORT_SYMBOL_GPL(regulator_set_mode);
3341 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3345 mutex_lock(&rdev->mutex);
3348 if (!rdev->desc->ops->get_mode) {
3353 ret = rdev->desc->ops->get_mode(rdev);
3355 mutex_unlock(&rdev->mutex);
3360 * regulator_get_mode - get regulator operating mode
3361 * @regulator: regulator source
3363 * Get the current regulator operating mode.
3365 unsigned int regulator_get_mode(struct regulator *regulator)
3367 return _regulator_get_mode(regulator->rdev);
3369 EXPORT_SYMBOL_GPL(regulator_get_mode);
3372 * regulator_set_load - set regulator load
3373 * @regulator: regulator source
3374 * @uA_load: load current
3376 * Notifies the regulator core of a new device load. This is then used by
3377 * DRMS (if enabled by constraints) to set the most efficient regulator
3378 * operating mode for the new regulator loading.
3380 * Consumer devices notify their supply regulator of the maximum power
3381 * they will require (can be taken from device datasheet in the power
3382 * consumption tables) when they change operational status and hence power
3383 * state. Examples of operational state changes that can affect power
3384 * consumption are :-
3386 * o Device is opened / closed.
3387 * o Device I/O is about to begin or has just finished.
3388 * o Device is idling in between work.
3390 * This information is also exported via sysfs to userspace.
3392 * DRMS will sum the total requested load on the regulator and change
3393 * to the most efficient operating mode if platform constraints allow.
3395 * On error a negative errno is returned.
3397 int regulator_set_load(struct regulator *regulator, int uA_load)
3399 struct regulator_dev *rdev = regulator->rdev;
3402 mutex_lock(&rdev->mutex);
3403 regulator->uA_load = uA_load;
3404 ret = drms_uA_update(rdev);
3405 mutex_unlock(&rdev->mutex);
3409 EXPORT_SYMBOL_GPL(regulator_set_load);
3412 * regulator_allow_bypass - allow the regulator to go into bypass mode
3414 * @regulator: Regulator to configure
3415 * @enable: enable or disable bypass mode
3417 * Allow the regulator to go into bypass mode if all other consumers
3418 * for the regulator also enable bypass mode and the machine
3419 * constraints allow this. Bypass mode means that the regulator is
3420 * simply passing the input directly to the output with no regulation.
3422 int regulator_allow_bypass(struct regulator *regulator, bool enable)
3424 struct regulator_dev *rdev = regulator->rdev;
3427 if (!rdev->desc->ops->set_bypass)
3430 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS))
3433 mutex_lock(&rdev->mutex);
3435 if (enable && !regulator->bypass) {
3436 rdev->bypass_count++;
3438 if (rdev->bypass_count == rdev->open_count) {
3439 ret = rdev->desc->ops->set_bypass(rdev, enable);
3441 rdev->bypass_count--;
3444 } else if (!enable && regulator->bypass) {
3445 rdev->bypass_count--;
3447 if (rdev->bypass_count != rdev->open_count) {
3448 ret = rdev->desc->ops->set_bypass(rdev, enable);
3450 rdev->bypass_count++;
3455 regulator->bypass = enable;
3457 mutex_unlock(&rdev->mutex);
3461 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3464 * regulator_register_notifier - register regulator event notifier
3465 * @regulator: regulator source
3466 * @nb: notifier block
3468 * Register notifier block to receive regulator events.
3470 int regulator_register_notifier(struct regulator *regulator,
3471 struct notifier_block *nb)
3473 return blocking_notifier_chain_register(®ulator->rdev->notifier,
3476 EXPORT_SYMBOL_GPL(regulator_register_notifier);
3479 * regulator_unregister_notifier - unregister regulator event notifier
3480 * @regulator: regulator source
3481 * @nb: notifier block
3483 * Unregister regulator event notifier block.
3485 int regulator_unregister_notifier(struct regulator *regulator,
3486 struct notifier_block *nb)
3488 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
3491 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3493 /* notify regulator consumers and downstream regulator consumers.
3494 * Note mutex must be held by caller.
3496 static int _notifier_call_chain(struct regulator_dev *rdev,
3497 unsigned long event, void *data)
3499 /* call rdev chain first */
3500 return blocking_notifier_call_chain(&rdev->notifier, event, data);
3504 * regulator_bulk_get - get multiple regulator consumers
3506 * @dev: Device to supply
3507 * @num_consumers: Number of consumers to register
3508 * @consumers: Configuration of consumers; clients are stored here.
3510 * @return 0 on success, an errno on failure.
3512 * This helper function allows drivers to get several regulator
3513 * consumers in one operation. If any of the regulators cannot be
3514 * acquired then any regulators that were allocated will be freed
3515 * before returning to the caller.
3517 int regulator_bulk_get(struct device *dev, int num_consumers,
3518 struct regulator_bulk_data *consumers)
3523 for (i = 0; i < num_consumers; i++)
3524 consumers[i].consumer = NULL;
3526 for (i = 0; i < num_consumers; i++) {
3527 consumers[i].consumer = regulator_get(dev,
3528 consumers[i].supply);
3529 if (IS_ERR(consumers[i].consumer)) {
3530 ret = PTR_ERR(consumers[i].consumer);
3531 dev_err(dev, "Failed to get supply '%s': %d\n",
3532 consumers[i].supply, ret);
3533 consumers[i].consumer = NULL;
3542 regulator_put(consumers[i].consumer);
3546 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3548 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3550 struct regulator_bulk_data *bulk = data;
3552 bulk->ret = regulator_enable(bulk->consumer);
3556 * regulator_bulk_enable - enable multiple regulator consumers
3558 * @num_consumers: Number of consumers
3559 * @consumers: Consumer data; clients are stored here.
3560 * @return 0 on success, an errno on failure
3562 * This convenience API allows consumers to enable multiple regulator
3563 * clients in a single API call. If any consumers cannot be enabled
3564 * then any others that were enabled will be disabled again prior to
3567 int regulator_bulk_enable(int num_consumers,
3568 struct regulator_bulk_data *consumers)
3570 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3574 for (i = 0; i < num_consumers; i++) {
3575 if (consumers[i].consumer->always_on)
3576 consumers[i].ret = 0;
3578 async_schedule_domain(regulator_bulk_enable_async,
3579 &consumers[i], &async_domain);
3582 async_synchronize_full_domain(&async_domain);
3584 /* If any consumer failed we need to unwind any that succeeded */
3585 for (i = 0; i < num_consumers; i++) {
3586 if (consumers[i].ret != 0) {
3587 ret = consumers[i].ret;
3595 for (i = 0; i < num_consumers; i++) {
3596 if (consumers[i].ret < 0)
3597 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3600 regulator_disable(consumers[i].consumer);
3605 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3608 * regulator_bulk_disable - disable multiple regulator consumers
3610 * @num_consumers: Number of consumers
3611 * @consumers: Consumer data; clients are stored here.
3612 * @return 0 on success, an errno on failure
3614 * This convenience API allows consumers to disable multiple regulator
3615 * clients in a single API call. If any consumers cannot be disabled
3616 * then any others that were disabled will be enabled again prior to
3619 int regulator_bulk_disable(int num_consumers,
3620 struct regulator_bulk_data *consumers)
3625 for (i = num_consumers - 1; i >= 0; --i) {
3626 ret = regulator_disable(consumers[i].consumer);
3634 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3635 for (++i; i < num_consumers; ++i) {
3636 r = regulator_enable(consumers[i].consumer);
3638 pr_err("Failed to reename %s: %d\n",
3639 consumers[i].supply, r);
3644 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3647 * regulator_bulk_force_disable - force disable multiple regulator consumers
3649 * @num_consumers: Number of consumers
3650 * @consumers: Consumer data; clients are stored here.
3651 * @return 0 on success, an errno on failure
3653 * This convenience API allows consumers to forcibly disable multiple regulator
3654 * clients in a single API call.
3655 * NOTE: This should be used for situations when device damage will
3656 * likely occur if the regulators are not disabled (e.g. over temp).
3657 * Although regulator_force_disable function call for some consumers can
3658 * return error numbers, the function is called for all consumers.
3660 int regulator_bulk_force_disable(int num_consumers,
3661 struct regulator_bulk_data *consumers)
3666 for (i = 0; i < num_consumers; i++)
3668 regulator_force_disable(consumers[i].consumer);
3670 for (i = 0; i < num_consumers; i++) {
3671 if (consumers[i].ret != 0) {
3672 ret = consumers[i].ret;
3681 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3684 * regulator_bulk_free - free multiple regulator consumers
3686 * @num_consumers: Number of consumers
3687 * @consumers: Consumer data; clients are stored here.
3689 * This convenience API allows consumers to free multiple regulator
3690 * clients in a single API call.
3692 void regulator_bulk_free(int num_consumers,
3693 struct regulator_bulk_data *consumers)
3697 for (i = 0; i < num_consumers; i++) {
3698 regulator_put(consumers[i].consumer);
3699 consumers[i].consumer = NULL;
3702 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3705 * regulator_notifier_call_chain - call regulator event notifier
3706 * @rdev: regulator source
3707 * @event: notifier block
3708 * @data: callback-specific data.
3710 * Called by regulator drivers to notify clients a regulator event has
3711 * occurred. We also notify regulator clients downstream.
3712 * Note lock must be held by caller.
3714 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3715 unsigned long event, void *data)
3717 lockdep_assert_held_once(&rdev->mutex);
3719 _notifier_call_chain(rdev, event, data);
3723 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3726 * regulator_mode_to_status - convert a regulator mode into a status
3728 * @mode: Mode to convert
3730 * Convert a regulator mode into a status.
3732 int regulator_mode_to_status(unsigned int mode)
3735 case REGULATOR_MODE_FAST:
3736 return REGULATOR_STATUS_FAST;
3737 case REGULATOR_MODE_NORMAL:
3738 return REGULATOR_STATUS_NORMAL;
3739 case REGULATOR_MODE_IDLE:
3740 return REGULATOR_STATUS_IDLE;
3741 case REGULATOR_MODE_STANDBY:
3742 return REGULATOR_STATUS_STANDBY;
3744 return REGULATOR_STATUS_UNDEFINED;
3747 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3749 static struct attribute *regulator_dev_attrs[] = {
3750 &dev_attr_name.attr,
3751 &dev_attr_num_users.attr,
3752 &dev_attr_type.attr,
3753 &dev_attr_microvolts.attr,
3754 &dev_attr_microamps.attr,
3755 &dev_attr_opmode.attr,
3756 &dev_attr_state.attr,
3757 &dev_attr_status.attr,
3758 &dev_attr_bypass.attr,
3759 &dev_attr_requested_microamps.attr,
3760 &dev_attr_min_microvolts.attr,
3761 &dev_attr_max_microvolts.attr,
3762 &dev_attr_min_microamps.attr,
3763 &dev_attr_max_microamps.attr,
3764 &dev_attr_suspend_standby_state.attr,
3765 &dev_attr_suspend_mem_state.attr,
3766 &dev_attr_suspend_disk_state.attr,
3767 &dev_attr_suspend_standby_microvolts.attr,
3768 &dev_attr_suspend_mem_microvolts.attr,
3769 &dev_attr_suspend_disk_microvolts.attr,
3770 &dev_attr_suspend_standby_mode.attr,
3771 &dev_attr_suspend_mem_mode.attr,
3772 &dev_attr_suspend_disk_mode.attr,
3777 * To avoid cluttering sysfs (and memory) with useless state, only
3778 * create attributes that can be meaningfully displayed.
3780 static umode_t regulator_attr_is_visible(struct kobject *kobj,
3781 struct attribute *attr, int idx)
3783 struct device *dev = kobj_to_dev(kobj);
3784 struct regulator_dev *rdev = dev_to_rdev(dev);
3785 const struct regulator_ops *ops = rdev->desc->ops;
3786 umode_t mode = attr->mode;
3788 /* these three are always present */
3789 if (attr == &dev_attr_name.attr ||
3790 attr == &dev_attr_num_users.attr ||
3791 attr == &dev_attr_type.attr)
3794 /* some attributes need specific methods to be displayed */
3795 if (attr == &dev_attr_microvolts.attr) {
3796 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3797 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3798 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3799 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3804 if (attr == &dev_attr_microamps.attr)
3805 return ops->get_current_limit ? mode : 0;
3807 if (attr == &dev_attr_opmode.attr)
3808 return ops->get_mode ? mode : 0;
3810 if (attr == &dev_attr_state.attr)
3811 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3813 if (attr == &dev_attr_status.attr)
3814 return ops->get_status ? mode : 0;
3816 if (attr == &dev_attr_bypass.attr)
3817 return ops->get_bypass ? mode : 0;
3819 /* some attributes are type-specific */
3820 if (attr == &dev_attr_requested_microamps.attr)
3821 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
3823 /* constraints need specific supporting methods */
3824 if (attr == &dev_attr_min_microvolts.attr ||
3825 attr == &dev_attr_max_microvolts.attr)
3826 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3828 if (attr == &dev_attr_min_microamps.attr ||
3829 attr == &dev_attr_max_microamps.attr)
3830 return ops->set_current_limit ? mode : 0;
3832 if (attr == &dev_attr_suspend_standby_state.attr ||
3833 attr == &dev_attr_suspend_mem_state.attr ||
3834 attr == &dev_attr_suspend_disk_state.attr)
3837 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3838 attr == &dev_attr_suspend_mem_microvolts.attr ||
3839 attr == &dev_attr_suspend_disk_microvolts.attr)
3840 return ops->set_suspend_voltage ? mode : 0;
3842 if (attr == &dev_attr_suspend_standby_mode.attr ||
3843 attr == &dev_attr_suspend_mem_mode.attr ||
3844 attr == &dev_attr_suspend_disk_mode.attr)
3845 return ops->set_suspend_mode ? mode : 0;
3850 static const struct attribute_group regulator_dev_group = {
3851 .attrs = regulator_dev_attrs,
3852 .is_visible = regulator_attr_is_visible,
3855 static const struct attribute_group *regulator_dev_groups[] = {
3856 ®ulator_dev_group,
3860 static void regulator_dev_release(struct device *dev)
3862 struct regulator_dev *rdev = dev_get_drvdata(dev);
3864 kfree(rdev->constraints);
3865 of_node_put(rdev->dev.of_node);
3869 static struct class regulator_class = {
3870 .name = "regulator",
3871 .dev_release = regulator_dev_release,
3872 .dev_groups = regulator_dev_groups,
3875 static void rdev_init_debugfs(struct regulator_dev *rdev)
3877 struct device *parent = rdev->dev.parent;
3878 const char *rname = rdev_get_name(rdev);
3879 char name[NAME_MAX];
3881 /* Avoid duplicate debugfs directory names */
3882 if (parent && rname == rdev->desc->name) {
3883 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3888 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
3889 if (!rdev->debugfs) {
3890 rdev_warn(rdev, "Failed to create debugfs directory\n");
3894 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3896 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3898 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3899 &rdev->bypass_count);
3902 static int regulator_register_resolve_supply(struct device *dev, void *data)
3904 struct regulator_dev *rdev = dev_to_rdev(dev);
3906 if (regulator_resolve_supply(rdev))
3907 rdev_dbg(rdev, "unable to resolve supply\n");
3913 * regulator_register - register regulator
3914 * @regulator_desc: regulator to register
3915 * @cfg: runtime configuration for regulator
3917 * Called by regulator drivers to register a regulator.
3918 * Returns a valid pointer to struct regulator_dev on success
3919 * or an ERR_PTR() on error.
3921 struct regulator_dev *
3922 regulator_register(const struct regulator_desc *regulator_desc,
3923 const struct regulator_config *cfg)
3925 const struct regulator_init_data *init_data;
3926 struct regulator_config *config = NULL;
3927 static atomic_t regulator_no = ATOMIC_INIT(-1);
3928 struct regulator_dev *rdev;
3932 if (regulator_desc == NULL || cfg == NULL)
3933 return ERR_PTR(-EINVAL);
3938 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3939 return ERR_PTR(-EINVAL);
3941 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3942 regulator_desc->type != REGULATOR_CURRENT)
3943 return ERR_PTR(-EINVAL);
3945 /* Only one of each should be implemented */
3946 WARN_ON(regulator_desc->ops->get_voltage &&
3947 regulator_desc->ops->get_voltage_sel);
3948 WARN_ON(regulator_desc->ops->set_voltage &&
3949 regulator_desc->ops->set_voltage_sel);
3951 /* If we're using selectors we must implement list_voltage. */
3952 if (regulator_desc->ops->get_voltage_sel &&
3953 !regulator_desc->ops->list_voltage) {
3954 return ERR_PTR(-EINVAL);
3956 if (regulator_desc->ops->set_voltage_sel &&
3957 !regulator_desc->ops->list_voltage) {
3958 return ERR_PTR(-EINVAL);
3961 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3963 return ERR_PTR(-ENOMEM);
3966 * Duplicate the config so the driver could override it after
3967 * parsing init data.
3969 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
3970 if (config == NULL) {
3972 return ERR_PTR(-ENOMEM);
3975 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
3976 &rdev->dev.of_node);
3978 init_data = config->init_data;
3979 rdev->dev.of_node = of_node_get(config->of_node);
3982 mutex_init(&rdev->mutex);
3983 rdev->reg_data = config->driver_data;
3984 rdev->owner = regulator_desc->owner;
3985 rdev->desc = regulator_desc;
3987 rdev->regmap = config->regmap;
3988 else if (dev_get_regmap(dev, NULL))
3989 rdev->regmap = dev_get_regmap(dev, NULL);
3990 else if (dev->parent)
3991 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3992 INIT_LIST_HEAD(&rdev->consumer_list);
3993 INIT_LIST_HEAD(&rdev->list);
3994 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3995 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3997 /* preform any regulator specific init */
3998 if (init_data && init_data->regulator_init) {
3999 ret = init_data->regulator_init(rdev->reg_data);
4004 if ((config->ena_gpio || config->ena_gpio_initialized) &&
4005 gpio_is_valid(config->ena_gpio)) {
4006 mutex_lock(®ulator_list_mutex);
4007 ret = regulator_ena_gpio_request(rdev, config);
4008 mutex_unlock(®ulator_list_mutex);
4010 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
4011 config->ena_gpio, ret);
4016 /* register with sysfs */
4017 rdev->dev.class = ®ulator_class;
4018 rdev->dev.parent = dev;
4019 dev_set_name(&rdev->dev, "regulator.%lu",
4020 (unsigned long) atomic_inc_return(®ulator_no));
4022 /* set regulator constraints */
4024 rdev->constraints = kmemdup(&init_data->constraints,
4025 sizeof(*rdev->constraints),
4028 rdev->constraints = kzalloc(sizeof(*rdev->constraints),
4030 if (!rdev->constraints) {
4035 if (init_data && init_data->supply_regulator)
4036 rdev->supply_name = init_data->supply_regulator;
4037 else if (regulator_desc->supply_name)
4038 rdev->supply_name = regulator_desc->supply_name;
4040 ret = set_machine_constraints(rdev);
4041 if (ret == -EPROBE_DEFER) {
4042 /* Regulator might be in bypass mode and so needs its supply
4043 * to set the constraints */
4044 /* FIXME: this currently triggers a chicken-and-egg problem
4045 * when creating -SUPPLY symlink in sysfs to a regulator
4046 * that is just being created */
4047 ret = regulator_resolve_supply(rdev);
4049 ret = set_machine_constraints(rdev);
4051 rdev_dbg(rdev, "unable to resolve supply early: %pe\n",
4057 /* add consumers devices */
4059 for (i = 0; i < init_data->num_consumer_supplies; i++) {
4060 ret = set_consumer_device_supply(rdev,
4061 init_data->consumer_supplies[i].dev_name,
4062 init_data->consumer_supplies[i].supply);
4064 dev_err(dev, "Failed to set supply %s\n",
4065 init_data->consumer_supplies[i].supply);
4066 goto unset_supplies;
4071 if (!rdev->desc->ops->get_voltage &&
4072 !rdev->desc->ops->list_voltage &&
4073 !rdev->desc->fixed_uV)
4074 rdev->is_switch = true;
4076 dev_set_drvdata(&rdev->dev, rdev);
4077 ret = device_register(&rdev->dev);
4079 put_device(&rdev->dev);
4080 goto unset_supplies;
4083 rdev_init_debugfs(rdev);
4085 /* try to resolve regulators supply since a new one was registered */
4086 class_for_each_device(®ulator_class, NULL, NULL,
4087 regulator_register_resolve_supply);
4092 mutex_lock(®ulator_list_mutex);
4093 unset_regulator_supplies(rdev);
4094 mutex_unlock(®ulator_list_mutex);
4096 kfree(rdev->constraints);
4097 mutex_lock(®ulator_list_mutex);
4098 regulator_ena_gpio_free(rdev);
4099 mutex_unlock(®ulator_list_mutex);
4103 return ERR_PTR(ret);
4105 EXPORT_SYMBOL_GPL(regulator_register);
4108 * regulator_unregister - unregister regulator
4109 * @rdev: regulator to unregister
4111 * Called by regulator drivers to unregister a regulator.
4113 void regulator_unregister(struct regulator_dev *rdev)
4119 while (rdev->use_count--)
4120 regulator_disable(rdev->supply);
4121 regulator_put(rdev->supply);
4123 mutex_lock(®ulator_list_mutex);
4124 debugfs_remove_recursive(rdev->debugfs);
4125 flush_work(&rdev->disable_work.work);
4126 WARN_ON(rdev->open_count);
4127 unset_regulator_supplies(rdev);
4128 list_del(&rdev->list);
4129 regulator_ena_gpio_free(rdev);
4130 mutex_unlock(®ulator_list_mutex);
4131 device_unregister(&rdev->dev);
4133 EXPORT_SYMBOL_GPL(regulator_unregister);
4135 static int _regulator_suspend_prepare(struct device *dev, void *data)
4137 struct regulator_dev *rdev = dev_to_rdev(dev);
4138 const suspend_state_t *state = data;
4141 mutex_lock(&rdev->mutex);
4142 ret = suspend_prepare(rdev, *state);
4143 mutex_unlock(&rdev->mutex);
4149 * regulator_suspend_prepare - prepare regulators for system wide suspend
4150 * @state: system suspend state
4152 * Configure each regulator with it's suspend operating parameters for state.
4153 * This will usually be called by machine suspend code prior to supending.
4155 int regulator_suspend_prepare(suspend_state_t state)
4157 /* ON is handled by regulator active state */
4158 if (state == PM_SUSPEND_ON)
4161 return class_for_each_device(®ulator_class, NULL, &state,
4162 _regulator_suspend_prepare);
4164 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
4166 static int _regulator_suspend_finish(struct device *dev, void *data)
4168 struct regulator_dev *rdev = dev_to_rdev(dev);
4171 mutex_lock(&rdev->mutex);
4172 if (rdev->use_count > 0 || rdev->constraints->always_on) {
4173 if (!_regulator_is_enabled(rdev)) {
4174 ret = _regulator_do_enable(rdev);
4177 "Failed to resume regulator %d\n",
4181 if (!have_full_constraints())
4183 if (!_regulator_is_enabled(rdev))
4186 ret = _regulator_do_disable(rdev);
4188 dev_err(dev, "Failed to suspend regulator %d\n", ret);
4191 mutex_unlock(&rdev->mutex);
4193 /* Keep processing regulators in spite of any errors */
4198 * regulator_suspend_finish - resume regulators from system wide suspend
4200 * Turn on regulators that might be turned off by regulator_suspend_prepare
4201 * and that should be turned on according to the regulators properties.
4203 int regulator_suspend_finish(void)
4205 return class_for_each_device(®ulator_class, NULL, NULL,
4206 _regulator_suspend_finish);
4208 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
4211 * regulator_has_full_constraints - the system has fully specified constraints
4213 * Calling this function will cause the regulator API to disable all
4214 * regulators which have a zero use count and don't have an always_on
4215 * constraint in a late_initcall.
4217 * The intention is that this will become the default behaviour in a
4218 * future kernel release so users are encouraged to use this facility
4221 void regulator_has_full_constraints(void)
4223 has_full_constraints = 1;
4225 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4228 * rdev_get_drvdata - get rdev regulator driver data
4231 * Get rdev regulator driver private data. This call can be used in the
4232 * regulator driver context.
4234 void *rdev_get_drvdata(struct regulator_dev *rdev)
4236 return rdev->reg_data;
4238 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4241 * regulator_get_drvdata - get regulator driver data
4242 * @regulator: regulator
4244 * Get regulator driver private data. This call can be used in the consumer
4245 * driver context when non API regulator specific functions need to be called.
4247 void *regulator_get_drvdata(struct regulator *regulator)
4249 return regulator->rdev->reg_data;
4251 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4254 * regulator_set_drvdata - set regulator driver data
4255 * @regulator: regulator
4258 void regulator_set_drvdata(struct regulator *regulator, void *data)
4260 regulator->rdev->reg_data = data;
4262 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4265 * regulator_get_id - get regulator ID
4268 int rdev_get_id(struct regulator_dev *rdev)
4270 return rdev->desc->id;
4272 EXPORT_SYMBOL_GPL(rdev_get_id);
4274 struct device *rdev_get_dev(struct regulator_dev *rdev)
4278 EXPORT_SYMBOL_GPL(rdev_get_dev);
4280 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4282 return reg_init_data->driver_data;
4284 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4286 #ifdef CONFIG_DEBUG_FS
4287 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
4288 size_t count, loff_t *ppos)
4290 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
4291 ssize_t len, ret = 0;
4292 struct regulator_map *map;
4297 list_for_each_entry(map, ®ulator_map_list, list) {
4298 len = snprintf(buf + ret, PAGE_SIZE - ret,
4300 rdev_get_name(map->regulator), map->dev_name,
4304 if (ret > PAGE_SIZE) {
4310 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
4318 static const struct file_operations supply_map_fops = {
4319 #ifdef CONFIG_DEBUG_FS
4320 .read = supply_map_read_file,
4321 .llseek = default_llseek,
4325 #ifdef CONFIG_DEBUG_FS
4326 struct summary_data {
4328 struct regulator_dev *parent;
4332 static void regulator_summary_show_subtree(struct seq_file *s,
4333 struct regulator_dev *rdev,
4336 static int regulator_summary_show_children(struct device *dev, void *data)
4338 struct regulator_dev *rdev = dev_to_rdev(dev);
4339 struct summary_data *summary_data = data;
4341 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
4342 regulator_summary_show_subtree(summary_data->s, rdev,
4343 summary_data->level + 1);
4348 static void regulator_summary_show_subtree(struct seq_file *s,
4349 struct regulator_dev *rdev,
4352 struct regulation_constraints *c;
4353 struct regulator *consumer;
4354 struct summary_data summary_data;
4359 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4361 30 - level * 3, rdev_get_name(rdev),
4362 rdev->use_count, rdev->open_count, rdev->bypass_count);
4364 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4365 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
4367 c = rdev->constraints;
4369 switch (rdev->desc->type) {
4370 case REGULATOR_VOLTAGE:
4371 seq_printf(s, "%5dmV %5dmV ",
4372 c->min_uV / 1000, c->max_uV / 1000);
4374 case REGULATOR_CURRENT:
4375 seq_printf(s, "%5dmA %5dmA ",
4376 c->min_uA / 1000, c->max_uA / 1000);
4383 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4384 if (consumer->dev && consumer->dev->class == ®ulator_class)
4387 seq_printf(s, "%*s%-*s ",
4388 (level + 1) * 3 + 1, "",
4389 30 - (level + 1) * 3,
4390 consumer->dev ? dev_name(consumer->dev) : "deviceless");
4392 switch (rdev->desc->type) {
4393 case REGULATOR_VOLTAGE:
4394 seq_printf(s, "%37dmV %5dmV",
4395 consumer->min_uV / 1000,
4396 consumer->max_uV / 1000);
4398 case REGULATOR_CURRENT:
4406 summary_data.level = level;
4407 summary_data.parent = rdev;
4409 class_for_each_device(®ulator_class, NULL, &summary_data,
4410 regulator_summary_show_children);
4413 static int regulator_summary_show_roots(struct device *dev, void *data)
4415 struct regulator_dev *rdev = dev_to_rdev(dev);
4416 struct seq_file *s = data;
4419 regulator_summary_show_subtree(s, rdev, 0);
4424 static int regulator_summary_show(struct seq_file *s, void *data)
4426 seq_puts(s, " regulator use open bypass voltage current min max\n");
4427 seq_puts(s, "-------------------------------------------------------------------------------\n");
4429 class_for_each_device(®ulator_class, NULL, s,
4430 regulator_summary_show_roots);
4435 static int regulator_summary_open(struct inode *inode, struct file *file)
4437 return single_open(file, regulator_summary_show, inode->i_private);
4441 static const struct file_operations regulator_summary_fops = {
4442 #ifdef CONFIG_DEBUG_FS
4443 .open = regulator_summary_open,
4445 .llseek = seq_lseek,
4446 .release = single_release,
4450 static int __init regulator_init(void)
4454 ret = class_register(®ulator_class);
4456 debugfs_root = debugfs_create_dir("regulator", NULL);
4458 pr_warn("regulator: Failed to create debugfs directory\n");
4460 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4463 debugfs_create_file("regulator_summary", 0444, debugfs_root,
4464 NULL, ®ulator_summary_fops);
4466 regulator_dummy_init();
4471 /* init early to allow our consumers to complete system booting */
4472 core_initcall(regulator_init);
4474 static int __init regulator_late_cleanup(struct device *dev, void *data)
4476 struct regulator_dev *rdev = dev_to_rdev(dev);
4477 const struct regulator_ops *ops = rdev->desc->ops;
4478 struct regulation_constraints *c = rdev->constraints;
4481 if (c && c->always_on)
4484 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS))
4487 mutex_lock(&rdev->mutex);
4489 if (rdev->use_count)
4492 /* If we can't read the status assume it's on. */
4493 if (ops->is_enabled)
4494 enabled = ops->is_enabled(rdev);
4501 if (have_full_constraints()) {
4502 /* We log since this may kill the system if it goes
4504 rdev_info(rdev, "disabling\n");
4505 ret = _regulator_do_disable(rdev);
4507 rdev_err(rdev, "couldn't disable: %d\n", ret);
4509 /* The intention is that in future we will
4510 * assume that full constraints are provided
4511 * so warn even if we aren't going to do
4514 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4518 mutex_unlock(&rdev->mutex);
4523 static int __init regulator_init_complete(void)
4526 * Since DT doesn't provide an idiomatic mechanism for
4527 * enabling full constraints and since it's much more natural
4528 * with DT to provide them just assume that a DT enabled
4529 * system has full constraints.
4531 if (of_have_populated_dt())
4532 has_full_constraints = true;
4535 * Regulators may had failed to resolve their input supplies
4536 * when were registered, either because the input supply was
4537 * not registered yet or because its parent device was not
4538 * bound yet. So attempt to resolve the input supplies for
4539 * pending regulators before trying to disable unused ones.
4541 class_for_each_device(®ulator_class, NULL, NULL,
4542 regulator_register_resolve_supply);
4544 /* If we have a full configuration then disable any regulators
4545 * we have permission to change the status for and which are
4546 * not in use or always_on. This is effectively the default
4547 * for DT and ACPI as they have full constraints.
4549 class_for_each_device(®ulator_class, NULL, NULL,
4550 regulator_late_cleanup);
4554 late_initcall_sync(regulator_init_complete);