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_list);
55 static LIST_HEAD(regulator_map_list);
56 static LIST_HEAD(regulator_ena_gpio_list);
57 static LIST_HEAD(regulator_supply_alias_list);
58 static bool has_full_constraints;
60 static struct dentry *debugfs_root;
63 * struct regulator_map
65 * Used to provide symbolic supply names to devices.
67 struct regulator_map {
68 struct list_head list;
69 const char *dev_name; /* The dev_name() for the consumer */
71 struct regulator_dev *regulator;
75 * struct regulator_enable_gpio
77 * Management for shared enable GPIO pin
79 struct regulator_enable_gpio {
80 struct list_head list;
81 struct gpio_desc *gpiod;
82 u32 enable_count; /* a number of enabled shared GPIO */
83 u32 request_count; /* a number of requested shared GPIO */
84 unsigned int ena_gpio_invert:1;
88 * struct regulator_supply_alias
90 * Used to map lookups for a supply onto an alternative device.
92 struct regulator_supply_alias {
93 struct list_head list;
94 struct device *src_dev;
95 const char *src_supply;
96 struct device *alias_dev;
97 const char *alias_supply;
100 static int _regulator_is_enabled(struct regulator_dev *rdev);
101 static int _regulator_disable(struct regulator_dev *rdev);
102 static int _regulator_get_voltage(struct regulator_dev *rdev);
103 static int _regulator_get_current_limit(struct regulator_dev *rdev);
104 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
105 static int _notifier_call_chain(struct regulator_dev *rdev,
106 unsigned long event, void *data);
107 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
108 int min_uV, int max_uV);
109 static struct regulator *create_regulator(struct regulator_dev *rdev,
111 const char *supply_name);
113 static const char *rdev_get_name(struct regulator_dev *rdev)
115 if (rdev->constraints && rdev->constraints->name)
116 return rdev->constraints->name;
117 else if (rdev->desc->name)
118 return rdev->desc->name;
123 static bool have_full_constraints(void)
125 return has_full_constraints || of_have_populated_dt();
129 * of_get_regulator - get a regulator device node based on supply name
130 * @dev: Device pointer for the consumer (of regulator) device
131 * @supply: regulator supply name
133 * Extract the regulator device node corresponding to the supply name.
134 * returns the device node corresponding to the regulator if found, else
137 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
139 struct device_node *regnode = NULL;
140 char prop_name[32]; /* 32 is max size of property name */
142 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
144 snprintf(prop_name, 32, "%s-supply", supply);
145 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
148 dev_dbg(dev, "Looking up %s property in node %s failed",
149 prop_name, dev->of_node->full_name);
155 static int _regulator_can_change_status(struct regulator_dev *rdev)
157 if (!rdev->constraints)
160 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
166 /* Platform voltage constraint check */
167 static int regulator_check_voltage(struct regulator_dev *rdev,
168 int *min_uV, int *max_uV)
170 BUG_ON(*min_uV > *max_uV);
172 if (!rdev->constraints) {
173 rdev_err(rdev, "no constraints\n");
176 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
177 rdev_err(rdev, "operation not allowed\n");
181 if (*max_uV > rdev->constraints->max_uV)
182 *max_uV = rdev->constraints->max_uV;
183 if (*min_uV < rdev->constraints->min_uV)
184 *min_uV = rdev->constraints->min_uV;
186 if (*min_uV > *max_uV) {
187 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
195 /* Make sure we select a voltage that suits the needs of all
196 * regulator consumers
198 static int regulator_check_consumers(struct regulator_dev *rdev,
199 int *min_uV, int *max_uV)
201 struct regulator *regulator;
203 list_for_each_entry(regulator, &rdev->consumer_list, list) {
205 * Assume consumers that didn't say anything are OK
206 * with anything in the constraint range.
208 if (!regulator->min_uV && !regulator->max_uV)
211 if (*max_uV > regulator->max_uV)
212 *max_uV = regulator->max_uV;
213 if (*min_uV < regulator->min_uV)
214 *min_uV = regulator->min_uV;
217 if (*min_uV > *max_uV) {
218 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
226 /* current constraint check */
227 static int regulator_check_current_limit(struct regulator_dev *rdev,
228 int *min_uA, int *max_uA)
230 BUG_ON(*min_uA > *max_uA);
232 if (!rdev->constraints) {
233 rdev_err(rdev, "no constraints\n");
236 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
237 rdev_err(rdev, "operation not allowed\n");
241 if (*max_uA > rdev->constraints->max_uA)
242 *max_uA = rdev->constraints->max_uA;
243 if (*min_uA < rdev->constraints->min_uA)
244 *min_uA = rdev->constraints->min_uA;
246 if (*min_uA > *max_uA) {
247 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
255 /* operating mode constraint check */
256 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
259 case REGULATOR_MODE_FAST:
260 case REGULATOR_MODE_NORMAL:
261 case REGULATOR_MODE_IDLE:
262 case REGULATOR_MODE_STANDBY:
265 rdev_err(rdev, "invalid mode %x specified\n", *mode);
269 if (!rdev->constraints) {
270 rdev_err(rdev, "no constraints\n");
273 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
274 rdev_err(rdev, "operation not allowed\n");
278 /* The modes are bitmasks, the most power hungry modes having
279 * the lowest values. If the requested mode isn't supported
280 * try higher modes. */
282 if (rdev->constraints->valid_modes_mask & *mode)
290 /* dynamic regulator mode switching constraint check */
291 static int regulator_check_drms(struct regulator_dev *rdev)
293 if (!rdev->constraints) {
294 rdev_err(rdev, "no constraints\n");
297 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
298 rdev_err(rdev, "operation not allowed\n");
304 static ssize_t regulator_uV_show(struct device *dev,
305 struct device_attribute *attr, char *buf)
307 struct regulator_dev *rdev = dev_get_drvdata(dev);
310 mutex_lock(&rdev->mutex);
311 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
312 mutex_unlock(&rdev->mutex);
316 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
318 static ssize_t regulator_uA_show(struct device *dev,
319 struct device_attribute *attr, char *buf)
321 struct regulator_dev *rdev = dev_get_drvdata(dev);
323 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
325 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
327 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
330 struct regulator_dev *rdev = dev_get_drvdata(dev);
332 return sprintf(buf, "%s\n", rdev_get_name(rdev));
334 static DEVICE_ATTR_RO(name);
336 static ssize_t regulator_print_opmode(char *buf, int mode)
339 case REGULATOR_MODE_FAST:
340 return sprintf(buf, "fast\n");
341 case REGULATOR_MODE_NORMAL:
342 return sprintf(buf, "normal\n");
343 case REGULATOR_MODE_IDLE:
344 return sprintf(buf, "idle\n");
345 case REGULATOR_MODE_STANDBY:
346 return sprintf(buf, "standby\n");
348 return sprintf(buf, "unknown\n");
351 static ssize_t regulator_opmode_show(struct device *dev,
352 struct device_attribute *attr, char *buf)
354 struct regulator_dev *rdev = dev_get_drvdata(dev);
356 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
358 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
360 static ssize_t regulator_print_state(char *buf, int state)
363 return sprintf(buf, "enabled\n");
365 return sprintf(buf, "disabled\n");
367 return sprintf(buf, "unknown\n");
370 static ssize_t regulator_state_show(struct device *dev,
371 struct device_attribute *attr, char *buf)
373 struct regulator_dev *rdev = dev_get_drvdata(dev);
376 mutex_lock(&rdev->mutex);
377 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
378 mutex_unlock(&rdev->mutex);
382 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
384 static ssize_t regulator_status_show(struct device *dev,
385 struct device_attribute *attr, char *buf)
387 struct regulator_dev *rdev = dev_get_drvdata(dev);
391 status = rdev->desc->ops->get_status(rdev);
396 case REGULATOR_STATUS_OFF:
399 case REGULATOR_STATUS_ON:
402 case REGULATOR_STATUS_ERROR:
405 case REGULATOR_STATUS_FAST:
408 case REGULATOR_STATUS_NORMAL:
411 case REGULATOR_STATUS_IDLE:
414 case REGULATOR_STATUS_STANDBY:
417 case REGULATOR_STATUS_BYPASS:
420 case REGULATOR_STATUS_UNDEFINED:
427 return sprintf(buf, "%s\n", label);
429 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
431 static ssize_t regulator_min_uA_show(struct device *dev,
432 struct device_attribute *attr, char *buf)
434 struct regulator_dev *rdev = dev_get_drvdata(dev);
436 if (!rdev->constraints)
437 return sprintf(buf, "constraint not defined\n");
439 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
441 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
443 static ssize_t regulator_max_uA_show(struct device *dev,
444 struct device_attribute *attr, char *buf)
446 struct regulator_dev *rdev = dev_get_drvdata(dev);
448 if (!rdev->constraints)
449 return sprintf(buf, "constraint not defined\n");
451 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
453 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
455 static ssize_t regulator_min_uV_show(struct device *dev,
456 struct device_attribute *attr, char *buf)
458 struct regulator_dev *rdev = dev_get_drvdata(dev);
460 if (!rdev->constraints)
461 return sprintf(buf, "constraint not defined\n");
463 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
465 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
467 static ssize_t regulator_max_uV_show(struct device *dev,
468 struct device_attribute *attr, char *buf)
470 struct regulator_dev *rdev = dev_get_drvdata(dev);
472 if (!rdev->constraints)
473 return sprintf(buf, "constraint not defined\n");
475 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
477 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
479 static ssize_t regulator_total_uA_show(struct device *dev,
480 struct device_attribute *attr, char *buf)
482 struct regulator_dev *rdev = dev_get_drvdata(dev);
483 struct regulator *regulator;
486 mutex_lock(&rdev->mutex);
487 list_for_each_entry(regulator, &rdev->consumer_list, list)
488 uA += regulator->uA_load;
489 mutex_unlock(&rdev->mutex);
490 return sprintf(buf, "%d\n", uA);
492 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
494 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
497 struct regulator_dev *rdev = dev_get_drvdata(dev);
498 return sprintf(buf, "%d\n", rdev->use_count);
500 static DEVICE_ATTR_RO(num_users);
502 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
505 struct regulator_dev *rdev = dev_get_drvdata(dev);
507 switch (rdev->desc->type) {
508 case REGULATOR_VOLTAGE:
509 return sprintf(buf, "voltage\n");
510 case REGULATOR_CURRENT:
511 return sprintf(buf, "current\n");
513 return sprintf(buf, "unknown\n");
515 static DEVICE_ATTR_RO(type);
517 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
518 struct device_attribute *attr, char *buf)
520 struct regulator_dev *rdev = dev_get_drvdata(dev);
522 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
524 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
525 regulator_suspend_mem_uV_show, NULL);
527 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
528 struct device_attribute *attr, char *buf)
530 struct regulator_dev *rdev = dev_get_drvdata(dev);
532 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
534 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
535 regulator_suspend_disk_uV_show, NULL);
537 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
538 struct device_attribute *attr, char *buf)
540 struct regulator_dev *rdev = dev_get_drvdata(dev);
542 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
544 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
545 regulator_suspend_standby_uV_show, NULL);
547 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
548 struct device_attribute *attr, char *buf)
550 struct regulator_dev *rdev = dev_get_drvdata(dev);
552 return regulator_print_opmode(buf,
553 rdev->constraints->state_mem.mode);
555 static DEVICE_ATTR(suspend_mem_mode, 0444,
556 regulator_suspend_mem_mode_show, NULL);
558 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
559 struct device_attribute *attr, char *buf)
561 struct regulator_dev *rdev = dev_get_drvdata(dev);
563 return regulator_print_opmode(buf,
564 rdev->constraints->state_disk.mode);
566 static DEVICE_ATTR(suspend_disk_mode, 0444,
567 regulator_suspend_disk_mode_show, NULL);
569 static ssize_t regulator_suspend_standby_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_standby.mode);
577 static DEVICE_ATTR(suspend_standby_mode, 0444,
578 regulator_suspend_standby_mode_show, NULL);
580 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
581 struct device_attribute *attr, char *buf)
583 struct regulator_dev *rdev = dev_get_drvdata(dev);
585 return regulator_print_state(buf,
586 rdev->constraints->state_mem.enabled);
588 static DEVICE_ATTR(suspend_mem_state, 0444,
589 regulator_suspend_mem_state_show, NULL);
591 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
592 struct device_attribute *attr, char *buf)
594 struct regulator_dev *rdev = dev_get_drvdata(dev);
596 return regulator_print_state(buf,
597 rdev->constraints->state_disk.enabled);
599 static DEVICE_ATTR(suspend_disk_state, 0444,
600 regulator_suspend_disk_state_show, NULL);
602 static ssize_t regulator_suspend_standby_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_standby.enabled);
610 static DEVICE_ATTR(suspend_standby_state, 0444,
611 regulator_suspend_standby_state_show, NULL);
613 static ssize_t regulator_bypass_show(struct device *dev,
614 struct device_attribute *attr, char *buf)
616 struct regulator_dev *rdev = dev_get_drvdata(dev);
621 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
630 return sprintf(buf, "%s\n", report);
632 static DEVICE_ATTR(bypass, 0444,
633 regulator_bypass_show, NULL);
635 /* Calculate the new optimum regulator operating mode based on the new total
636 * consumer load. All locks held by caller */
637 static int drms_uA_update(struct regulator_dev *rdev)
639 struct regulator *sibling;
640 int current_uA = 0, output_uV, input_uV, err;
644 * first check to see if we can set modes at all, otherwise just
645 * tell the consumer everything is OK.
647 err = regulator_check_drms(rdev);
651 if (!rdev->desc->ops->get_optimum_mode &&
652 !rdev->desc->ops->set_load)
655 if (!rdev->desc->ops->set_mode &&
656 !rdev->desc->ops->set_load)
659 /* get output voltage */
660 output_uV = _regulator_get_voltage(rdev);
661 if (output_uV <= 0) {
662 rdev_err(rdev, "invalid output voltage found\n");
666 /* get input voltage */
669 input_uV = regulator_get_voltage(rdev->supply);
671 input_uV = rdev->constraints->input_uV;
673 rdev_err(rdev, "invalid input voltage found\n");
677 /* calc total requested load */
678 list_for_each_entry(sibling, &rdev->consumer_list, list)
679 current_uA += sibling->uA_load;
681 current_uA += rdev->constraints->system_load;
683 if (rdev->desc->ops->set_load) {
684 /* set the optimum mode for our new total regulator load */
685 err = rdev->desc->ops->set_load(rdev, current_uA);
687 rdev_err(rdev, "failed to set load %d\n", current_uA);
689 /* now get the optimum mode for our new total regulator load */
690 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
691 output_uV, current_uA);
693 /* check the new mode is allowed */
694 err = regulator_mode_constrain(rdev, &mode);
696 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
697 current_uA, input_uV, output_uV);
701 err = rdev->desc->ops->set_mode(rdev, mode);
703 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
709 static int suspend_set_state(struct regulator_dev *rdev,
710 struct regulator_state *rstate)
714 /* If we have no suspend mode configration don't set anything;
715 * only warn if the driver implements set_suspend_voltage or
716 * set_suspend_mode callback.
718 if (!rstate->enabled && !rstate->disabled) {
719 if (rdev->desc->ops->set_suspend_voltage ||
720 rdev->desc->ops->set_suspend_mode)
721 rdev_warn(rdev, "No configuration\n");
725 if (rstate->enabled && rstate->disabled) {
726 rdev_err(rdev, "invalid configuration\n");
730 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
731 ret = rdev->desc->ops->set_suspend_enable(rdev);
732 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
733 ret = rdev->desc->ops->set_suspend_disable(rdev);
734 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
738 rdev_err(rdev, "failed to enabled/disable\n");
742 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
743 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
745 rdev_err(rdev, "failed to set voltage\n");
750 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
751 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
753 rdev_err(rdev, "failed to set mode\n");
760 /* locks held by caller */
761 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
763 if (!rdev->constraints)
767 case PM_SUSPEND_STANDBY:
768 return suspend_set_state(rdev,
769 &rdev->constraints->state_standby);
771 return suspend_set_state(rdev,
772 &rdev->constraints->state_mem);
774 return suspend_set_state(rdev,
775 &rdev->constraints->state_disk);
781 static void print_constraints(struct regulator_dev *rdev)
783 struct regulation_constraints *constraints = rdev->constraints;
785 size_t len = sizeof(buf) - 1;
789 if (constraints->min_uV && constraints->max_uV) {
790 if (constraints->min_uV == constraints->max_uV)
791 count += scnprintf(buf + count, len - count, "%d mV ",
792 constraints->min_uV / 1000);
794 count += scnprintf(buf + count, len - count,
796 constraints->min_uV / 1000,
797 constraints->max_uV / 1000);
800 if (!constraints->min_uV ||
801 constraints->min_uV != constraints->max_uV) {
802 ret = _regulator_get_voltage(rdev);
804 count += scnprintf(buf + count, len - count,
805 "at %d mV ", ret / 1000);
808 if (constraints->uV_offset)
809 count += scnprintf(buf + count, len - count, "%dmV offset ",
810 constraints->uV_offset / 1000);
812 if (constraints->min_uA && constraints->max_uA) {
813 if (constraints->min_uA == constraints->max_uA)
814 count += scnprintf(buf + count, len - count, "%d mA ",
815 constraints->min_uA / 1000);
817 count += scnprintf(buf + count, len - count,
819 constraints->min_uA / 1000,
820 constraints->max_uA / 1000);
823 if (!constraints->min_uA ||
824 constraints->min_uA != constraints->max_uA) {
825 ret = _regulator_get_current_limit(rdev);
827 count += scnprintf(buf + count, len - count,
828 "at %d mA ", ret / 1000);
831 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
832 count += scnprintf(buf + count, len - count, "fast ");
833 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
834 count += scnprintf(buf + count, len - count, "normal ");
835 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
836 count += scnprintf(buf + count, len - count, "idle ");
837 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
838 count += scnprintf(buf + count, len - count, "standby");
841 scnprintf(buf, len, "no parameters");
843 rdev_dbg(rdev, "%s\n", buf);
845 if ((constraints->min_uV != constraints->max_uV) &&
846 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
848 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
851 static int machine_constraints_voltage(struct regulator_dev *rdev,
852 struct regulation_constraints *constraints)
854 const struct regulator_ops *ops = rdev->desc->ops;
857 /* do we need to apply the constraint voltage */
858 if (rdev->constraints->apply_uV &&
859 rdev->constraints->min_uV == rdev->constraints->max_uV) {
860 int current_uV = _regulator_get_voltage(rdev);
861 if (current_uV < 0) {
863 "failed to get the current voltage(%d)\n",
867 if (current_uV < rdev->constraints->min_uV ||
868 current_uV > rdev->constraints->max_uV) {
869 ret = _regulator_do_set_voltage(
870 rdev, rdev->constraints->min_uV,
871 rdev->constraints->max_uV);
874 "failed to apply %duV constraint(%d)\n",
875 rdev->constraints->min_uV, ret);
881 /* constrain machine-level voltage specs to fit
882 * the actual range supported by this regulator.
884 if (ops->list_voltage && rdev->desc->n_voltages) {
885 int count = rdev->desc->n_voltages;
887 int min_uV = INT_MAX;
888 int max_uV = INT_MIN;
889 int cmin = constraints->min_uV;
890 int cmax = constraints->max_uV;
892 /* it's safe to autoconfigure fixed-voltage supplies
893 and the constraints are used by list_voltage. */
894 if (count == 1 && !cmin) {
897 constraints->min_uV = cmin;
898 constraints->max_uV = cmax;
901 /* voltage constraints are optional */
902 if ((cmin == 0) && (cmax == 0))
905 /* else require explicit machine-level constraints */
906 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
907 rdev_err(rdev, "invalid voltage constraints\n");
911 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
912 for (i = 0; i < count; i++) {
915 value = ops->list_voltage(rdev, i);
919 /* maybe adjust [min_uV..max_uV] */
920 if (value >= cmin && value < min_uV)
922 if (value <= cmax && value > max_uV)
926 /* final: [min_uV..max_uV] valid iff constraints valid */
927 if (max_uV < min_uV) {
929 "unsupportable voltage constraints %u-%uuV\n",
934 /* use regulator's subset of machine constraints */
935 if (constraints->min_uV < min_uV) {
936 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
937 constraints->min_uV, min_uV);
938 constraints->min_uV = min_uV;
940 if (constraints->max_uV > max_uV) {
941 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
942 constraints->max_uV, max_uV);
943 constraints->max_uV = max_uV;
950 static int machine_constraints_current(struct regulator_dev *rdev,
951 struct regulation_constraints *constraints)
953 const struct regulator_ops *ops = rdev->desc->ops;
956 if (!constraints->min_uA && !constraints->max_uA)
959 if (constraints->min_uA > constraints->max_uA) {
960 rdev_err(rdev, "Invalid current constraints\n");
964 if (!ops->set_current_limit || !ops->get_current_limit) {
965 rdev_warn(rdev, "Operation of current configuration missing\n");
969 /* Set regulator current in constraints range */
970 ret = ops->set_current_limit(rdev, constraints->min_uA,
971 constraints->max_uA);
973 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
980 static int _regulator_do_enable(struct regulator_dev *rdev);
983 * set_machine_constraints - sets regulator constraints
984 * @rdev: regulator source
985 * @constraints: constraints to apply
987 * Allows platform initialisation code to define and constrain
988 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
989 * Constraints *must* be set by platform code in order for some
990 * regulator operations to proceed i.e. set_voltage, set_current_limit,
993 static int set_machine_constraints(struct regulator_dev *rdev,
994 const struct regulation_constraints *constraints)
997 const struct regulator_ops *ops = rdev->desc->ops;
1000 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1003 rdev->constraints = kzalloc(sizeof(*constraints),
1005 if (!rdev->constraints)
1008 ret = machine_constraints_voltage(rdev, rdev->constraints);
1012 ret = machine_constraints_current(rdev, rdev->constraints);
1016 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1017 ret = ops->set_input_current_limit(rdev,
1018 rdev->constraints->ilim_uA);
1020 rdev_err(rdev, "failed to set input limit\n");
1025 /* do we need to setup our suspend state */
1026 if (rdev->constraints->initial_state) {
1027 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1029 rdev_err(rdev, "failed to set suspend state\n");
1034 if (rdev->constraints->initial_mode) {
1035 if (!ops->set_mode) {
1036 rdev_err(rdev, "no set_mode operation\n");
1041 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1043 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1048 /* If the constraints say the regulator should be on at this point
1049 * and we have control then make sure it is enabled.
1051 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1052 ret = _regulator_do_enable(rdev);
1053 if (ret < 0 && ret != -EINVAL) {
1054 rdev_err(rdev, "failed to enable\n");
1059 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1060 && ops->set_ramp_delay) {
1061 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1063 rdev_err(rdev, "failed to set ramp_delay\n");
1068 if (rdev->constraints->pull_down && ops->set_pull_down) {
1069 ret = ops->set_pull_down(rdev);
1071 rdev_err(rdev, "failed to set pull down\n");
1076 if (rdev->constraints->soft_start && ops->set_soft_start) {
1077 ret = ops->set_soft_start(rdev);
1079 rdev_err(rdev, "failed to set soft start\n");
1084 print_constraints(rdev);
1087 kfree(rdev->constraints);
1088 rdev->constraints = NULL;
1093 * set_supply - set regulator supply regulator
1094 * @rdev: regulator name
1095 * @supply_rdev: supply regulator name
1097 * Called by platform initialisation code to set the supply regulator for this
1098 * regulator. This ensures that a regulators supply will also be enabled by the
1099 * core if it's child is enabled.
1101 static int set_supply(struct regulator_dev *rdev,
1102 struct regulator_dev *supply_rdev)
1106 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1108 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1109 if (rdev->supply == NULL) {
1113 supply_rdev->open_count++;
1119 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1120 * @rdev: regulator source
1121 * @consumer_dev_name: dev_name() string for device supply applies to
1122 * @supply: symbolic name for supply
1124 * Allows platform initialisation code to map physical regulator
1125 * sources to symbolic names for supplies for use by devices. Devices
1126 * should use these symbolic names to request regulators, avoiding the
1127 * need to provide board-specific regulator names as platform data.
1129 static int set_consumer_device_supply(struct regulator_dev *rdev,
1130 const char *consumer_dev_name,
1133 struct regulator_map *node;
1139 if (consumer_dev_name != NULL)
1144 list_for_each_entry(node, ®ulator_map_list, list) {
1145 if (node->dev_name && consumer_dev_name) {
1146 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1148 } else if (node->dev_name || consumer_dev_name) {
1152 if (strcmp(node->supply, supply) != 0)
1155 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1157 dev_name(&node->regulator->dev),
1158 node->regulator->desc->name,
1160 dev_name(&rdev->dev), rdev_get_name(rdev));
1164 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1168 node->regulator = rdev;
1169 node->supply = supply;
1172 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1173 if (node->dev_name == NULL) {
1179 list_add(&node->list, ®ulator_map_list);
1183 static void unset_regulator_supplies(struct regulator_dev *rdev)
1185 struct regulator_map *node, *n;
1187 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1188 if (rdev == node->regulator) {
1189 list_del(&node->list);
1190 kfree(node->dev_name);
1196 #define REG_STR_SIZE 64
1198 static struct regulator *create_regulator(struct regulator_dev *rdev,
1200 const char *supply_name)
1202 struct regulator *regulator;
1203 char buf[REG_STR_SIZE];
1206 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1207 if (regulator == NULL)
1210 mutex_lock(&rdev->mutex);
1211 regulator->rdev = rdev;
1212 list_add(®ulator->list, &rdev->consumer_list);
1215 regulator->dev = dev;
1217 /* Add a link to the device sysfs entry */
1218 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1219 dev->kobj.name, supply_name);
1220 if (size >= REG_STR_SIZE)
1223 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1224 if (regulator->supply_name == NULL)
1227 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1230 rdev_dbg(rdev, "could not add device link %s err %d\n",
1231 dev->kobj.name, err);
1235 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1236 if (regulator->supply_name == NULL)
1240 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1242 if (!regulator->debugfs) {
1243 rdev_warn(rdev, "Failed to create debugfs directory\n");
1245 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1246 ®ulator->uA_load);
1247 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1248 ®ulator->min_uV);
1249 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1250 ®ulator->max_uV);
1254 * Check now if the regulator is an always on regulator - if
1255 * it is then we don't need to do nearly so much work for
1256 * enable/disable calls.
1258 if (!_regulator_can_change_status(rdev) &&
1259 _regulator_is_enabled(rdev))
1260 regulator->always_on = true;
1262 mutex_unlock(&rdev->mutex);
1265 list_del(®ulator->list);
1267 mutex_unlock(&rdev->mutex);
1271 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1273 if (rdev->constraints && rdev->constraints->enable_time)
1274 return rdev->constraints->enable_time;
1275 if (!rdev->desc->ops->enable_time)
1276 return rdev->desc->enable_time;
1277 return rdev->desc->ops->enable_time(rdev);
1280 static struct regulator_supply_alias *regulator_find_supply_alias(
1281 struct device *dev, const char *supply)
1283 struct regulator_supply_alias *map;
1285 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1286 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1292 static void regulator_supply_alias(struct device **dev, const char **supply)
1294 struct regulator_supply_alias *map;
1296 map = regulator_find_supply_alias(*dev, *supply);
1298 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1299 *supply, map->alias_supply,
1300 dev_name(map->alias_dev));
1301 *dev = map->alias_dev;
1302 *supply = map->alias_supply;
1306 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1310 struct regulator_dev *r;
1311 struct device_node *node;
1312 struct regulator_map *map;
1313 const char *devname = NULL;
1315 regulator_supply_alias(&dev, &supply);
1317 /* first do a dt based lookup */
1318 if (dev && dev->of_node) {
1319 node = of_get_regulator(dev, supply);
1321 list_for_each_entry(r, ®ulator_list, list)
1322 if (r->dev.parent &&
1323 node == r->dev.of_node)
1325 *ret = -EPROBE_DEFER;
1329 * If we couldn't even get the node then it's
1330 * not just that the device didn't register
1331 * yet, there's no node and we'll never
1338 /* if not found, try doing it non-dt way */
1340 devname = dev_name(dev);
1342 list_for_each_entry(r, ®ulator_list, list)
1343 if (strcmp(rdev_get_name(r), supply) == 0)
1346 list_for_each_entry(map, ®ulator_map_list, list) {
1347 /* If the mapping has a device set up it must match */
1348 if (map->dev_name &&
1349 (!devname || strcmp(map->dev_name, devname)))
1352 if (strcmp(map->supply, supply) == 0)
1353 return map->regulator;
1360 static int regulator_resolve_supply(struct regulator_dev *rdev)
1362 struct regulator_dev *r;
1363 struct device *dev = rdev->dev.parent;
1366 /* No supply to resovle? */
1367 if (!rdev->supply_name)
1370 /* Supply already resolved? */
1374 r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
1375 if (ret == -ENODEV) {
1377 * No supply was specified for this regulator and
1378 * there will never be one.
1384 if (have_full_constraints()) {
1385 r = dummy_regulator_rdev;
1387 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1388 rdev->supply_name, rdev->desc->name);
1389 return -EPROBE_DEFER;
1393 /* Recursively resolve the supply of the supply */
1394 ret = regulator_resolve_supply(r);
1398 ret = set_supply(rdev, r);
1402 /* Cascade always-on state to supply */
1403 if (_regulator_is_enabled(rdev)) {
1404 ret = regulator_enable(rdev->supply);
1412 /* Internal regulator request function */
1413 static struct regulator *_regulator_get(struct device *dev, const char *id,
1414 bool exclusive, bool allow_dummy)
1416 struct regulator_dev *rdev;
1417 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1418 const char *devname = NULL;
1422 pr_err("get() with no identifier\n");
1423 return ERR_PTR(-EINVAL);
1427 devname = dev_name(dev);
1429 if (have_full_constraints())
1432 ret = -EPROBE_DEFER;
1434 mutex_lock(®ulator_list_mutex);
1436 rdev = regulator_dev_lookup(dev, id, &ret);
1440 regulator = ERR_PTR(ret);
1443 * If we have return value from dev_lookup fail, we do not expect to
1444 * succeed, so, quit with appropriate error value
1446 if (ret && ret != -ENODEV)
1450 devname = "deviceless";
1453 * Assume that a regulator is physically present and enabled
1454 * even if it isn't hooked up and just provide a dummy.
1456 if (have_full_constraints() && allow_dummy) {
1457 pr_warn("%s supply %s not found, using dummy regulator\n",
1460 rdev = dummy_regulator_rdev;
1462 /* Don't log an error when called from regulator_get_optional() */
1463 } else if (!have_full_constraints() || exclusive) {
1464 dev_warn(dev, "dummy supplies not allowed\n");
1467 mutex_unlock(®ulator_list_mutex);
1471 if (rdev->exclusive) {
1472 regulator = ERR_PTR(-EPERM);
1476 if (exclusive && rdev->open_count) {
1477 regulator = ERR_PTR(-EBUSY);
1481 ret = regulator_resolve_supply(rdev);
1483 regulator = ERR_PTR(ret);
1487 if (!try_module_get(rdev->owner))
1490 regulator = create_regulator(rdev, dev, id);
1491 if (regulator == NULL) {
1492 regulator = ERR_PTR(-ENOMEM);
1493 module_put(rdev->owner);
1499 rdev->exclusive = 1;
1501 ret = _regulator_is_enabled(rdev);
1503 rdev->use_count = 1;
1505 rdev->use_count = 0;
1509 mutex_unlock(®ulator_list_mutex);
1515 * regulator_get - lookup and obtain a reference to a regulator.
1516 * @dev: device for regulator "consumer"
1517 * @id: Supply name or regulator ID.
1519 * Returns a struct regulator corresponding to the regulator producer,
1520 * or IS_ERR() condition containing errno.
1522 * Use of supply names configured via regulator_set_device_supply() is
1523 * strongly encouraged. It is recommended that the supply name used
1524 * should match the name used for the supply and/or the relevant
1525 * device pins in the datasheet.
1527 struct regulator *regulator_get(struct device *dev, const char *id)
1529 return _regulator_get(dev, id, false, true);
1531 EXPORT_SYMBOL_GPL(regulator_get);
1534 * regulator_get_exclusive - obtain exclusive access to a regulator.
1535 * @dev: device for regulator "consumer"
1536 * @id: Supply name or regulator ID.
1538 * Returns a struct regulator corresponding to the regulator producer,
1539 * or IS_ERR() condition containing errno. Other consumers will be
1540 * unable to obtain this regulator while this reference is held and the
1541 * use count for the regulator will be initialised to reflect the current
1542 * state of the regulator.
1544 * This is intended for use by consumers which cannot tolerate shared
1545 * use of the regulator such as those which need to force the
1546 * regulator off for correct operation of the hardware they are
1549 * Use of supply names configured via regulator_set_device_supply() is
1550 * strongly encouraged. It is recommended that the supply name used
1551 * should match the name used for the supply and/or the relevant
1552 * device pins in the datasheet.
1554 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1556 return _regulator_get(dev, id, true, false);
1558 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1561 * regulator_get_optional - obtain optional access to a regulator.
1562 * @dev: device for regulator "consumer"
1563 * @id: Supply name or regulator ID.
1565 * Returns a struct regulator corresponding to the regulator producer,
1566 * or IS_ERR() condition containing errno.
1568 * This is intended for use by consumers for devices which can have
1569 * some supplies unconnected in normal use, such as some MMC devices.
1570 * It can allow the regulator core to provide stub supplies for other
1571 * supplies requested using normal regulator_get() calls without
1572 * disrupting the operation of drivers that can handle absent
1575 * Use of supply names configured via regulator_set_device_supply() is
1576 * strongly encouraged. It is recommended that the supply name used
1577 * should match the name used for the supply and/or the relevant
1578 * device pins in the datasheet.
1580 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1582 return _regulator_get(dev, id, false, false);
1584 EXPORT_SYMBOL_GPL(regulator_get_optional);
1586 /* regulator_list_mutex lock held by regulator_put() */
1587 static void _regulator_put(struct regulator *regulator)
1589 struct regulator_dev *rdev;
1591 if (regulator == NULL || IS_ERR(regulator))
1594 rdev = regulator->rdev;
1596 debugfs_remove_recursive(regulator->debugfs);
1598 /* remove any sysfs entries */
1600 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1601 mutex_lock(&rdev->mutex);
1602 kfree(regulator->supply_name);
1603 list_del(®ulator->list);
1607 rdev->exclusive = 0;
1608 mutex_unlock(&rdev->mutex);
1610 module_put(rdev->owner);
1614 * regulator_put - "free" the regulator source
1615 * @regulator: regulator source
1617 * Note: drivers must ensure that all regulator_enable calls made on this
1618 * regulator source are balanced by regulator_disable calls prior to calling
1621 void regulator_put(struct regulator *regulator)
1623 mutex_lock(®ulator_list_mutex);
1624 _regulator_put(regulator);
1625 mutex_unlock(®ulator_list_mutex);
1627 EXPORT_SYMBOL_GPL(regulator_put);
1630 * regulator_register_supply_alias - Provide device alias for supply lookup
1632 * @dev: device that will be given as the regulator "consumer"
1633 * @id: Supply name or regulator ID
1634 * @alias_dev: device that should be used to lookup the supply
1635 * @alias_id: Supply name or regulator ID that should be used to lookup the
1638 * All lookups for id on dev will instead be conducted for alias_id on
1641 int regulator_register_supply_alias(struct device *dev, const char *id,
1642 struct device *alias_dev,
1643 const char *alias_id)
1645 struct regulator_supply_alias *map;
1647 map = regulator_find_supply_alias(dev, id);
1651 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1656 map->src_supply = id;
1657 map->alias_dev = alias_dev;
1658 map->alias_supply = alias_id;
1660 list_add(&map->list, ®ulator_supply_alias_list);
1662 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1663 id, dev_name(dev), alias_id, dev_name(alias_dev));
1667 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1670 * regulator_unregister_supply_alias - Remove device alias
1672 * @dev: device that will be given as the regulator "consumer"
1673 * @id: Supply name or regulator ID
1675 * Remove a lookup alias if one exists for id on dev.
1677 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1679 struct regulator_supply_alias *map;
1681 map = regulator_find_supply_alias(dev, id);
1683 list_del(&map->list);
1687 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1690 * regulator_bulk_register_supply_alias - register multiple aliases
1692 * @dev: device that will be given as the regulator "consumer"
1693 * @id: List of supply names or regulator IDs
1694 * @alias_dev: device that should be used to lookup the supply
1695 * @alias_id: List of supply names or regulator IDs that should be used to
1697 * @num_id: Number of aliases to register
1699 * @return 0 on success, an errno on failure.
1701 * This helper function allows drivers to register several supply
1702 * aliases in one operation. If any of the aliases cannot be
1703 * registered any aliases that were registered will be removed
1704 * before returning to the caller.
1706 int regulator_bulk_register_supply_alias(struct device *dev,
1707 const char *const *id,
1708 struct device *alias_dev,
1709 const char *const *alias_id,
1715 for (i = 0; i < num_id; ++i) {
1716 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1726 "Failed to create supply alias %s,%s -> %s,%s\n",
1727 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1730 regulator_unregister_supply_alias(dev, id[i]);
1734 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1737 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1739 * @dev: device that will be given as the regulator "consumer"
1740 * @id: List of supply names or regulator IDs
1741 * @num_id: Number of aliases to unregister
1743 * This helper function allows drivers to unregister several supply
1744 * aliases in one operation.
1746 void regulator_bulk_unregister_supply_alias(struct device *dev,
1747 const char *const *id,
1752 for (i = 0; i < num_id; ++i)
1753 regulator_unregister_supply_alias(dev, id[i]);
1755 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1758 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1759 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1760 const struct regulator_config *config)
1762 struct regulator_enable_gpio *pin;
1763 struct gpio_desc *gpiod;
1766 gpiod = gpio_to_desc(config->ena_gpio);
1768 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1769 if (pin->gpiod == gpiod) {
1770 rdev_dbg(rdev, "GPIO %d is already used\n",
1772 goto update_ena_gpio_to_rdev;
1776 ret = gpio_request_one(config->ena_gpio,
1777 GPIOF_DIR_OUT | config->ena_gpio_flags,
1778 rdev_get_name(rdev));
1782 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1784 gpio_free(config->ena_gpio);
1789 pin->ena_gpio_invert = config->ena_gpio_invert;
1790 list_add(&pin->list, ®ulator_ena_gpio_list);
1792 update_ena_gpio_to_rdev:
1793 pin->request_count++;
1794 rdev->ena_pin = pin;
1798 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1800 struct regulator_enable_gpio *pin, *n;
1805 /* Free the GPIO only in case of no use */
1806 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
1807 if (pin->gpiod == rdev->ena_pin->gpiod) {
1808 if (pin->request_count <= 1) {
1809 pin->request_count = 0;
1810 gpiod_put(pin->gpiod);
1811 list_del(&pin->list);
1813 rdev->ena_pin = NULL;
1816 pin->request_count--;
1823 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1824 * @rdev: regulator_dev structure
1825 * @enable: enable GPIO at initial use?
1827 * GPIO is enabled in case of initial use. (enable_count is 0)
1828 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1830 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1832 struct regulator_enable_gpio *pin = rdev->ena_pin;
1838 /* Enable GPIO at initial use */
1839 if (pin->enable_count == 0)
1840 gpiod_set_value_cansleep(pin->gpiod,
1841 !pin->ena_gpio_invert);
1843 pin->enable_count++;
1845 if (pin->enable_count > 1) {
1846 pin->enable_count--;
1850 /* Disable GPIO if not used */
1851 if (pin->enable_count <= 1) {
1852 gpiod_set_value_cansleep(pin->gpiod,
1853 pin->ena_gpio_invert);
1854 pin->enable_count = 0;
1862 * _regulator_enable_delay - a delay helper function
1863 * @delay: time to delay in microseconds
1865 * Delay for the requested amount of time as per the guidelines in:
1867 * Documentation/timers/timers-howto.txt
1869 * The assumption here is that regulators will never be enabled in
1870 * atomic context and therefore sleeping functions can be used.
1872 static void _regulator_enable_delay(unsigned int delay)
1874 unsigned int ms = delay / 1000;
1875 unsigned int us = delay % 1000;
1879 * For small enough values, handle super-millisecond
1880 * delays in the usleep_range() call below.
1889 * Give the scheduler some room to coalesce with any other
1890 * wakeup sources. For delays shorter than 10 us, don't even
1891 * bother setting up high-resolution timers and just busy-
1895 usleep_range(us, us + 100);
1900 static int _regulator_do_enable(struct regulator_dev *rdev)
1904 /* Query before enabling in case configuration dependent. */
1905 ret = _regulator_get_enable_time(rdev);
1909 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1913 trace_regulator_enable(rdev_get_name(rdev));
1915 if (rdev->desc->off_on_delay) {
1916 /* if needed, keep a distance of off_on_delay from last time
1917 * this regulator was disabled.
1919 unsigned long start_jiffy = jiffies;
1920 unsigned long intended, max_delay, remaining;
1922 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
1923 intended = rdev->last_off_jiffy + max_delay;
1925 if (time_before(start_jiffy, intended)) {
1926 /* calc remaining jiffies to deal with one-time
1928 * in case of multiple timer wrapping, either it can be
1929 * detected by out-of-range remaining, or it cannot be
1930 * detected and we gets a panelty of
1931 * _regulator_enable_delay().
1933 remaining = intended - start_jiffy;
1934 if (remaining <= max_delay)
1935 _regulator_enable_delay(
1936 jiffies_to_usecs(remaining));
1940 if (rdev->ena_pin) {
1941 if (!rdev->ena_gpio_state) {
1942 ret = regulator_ena_gpio_ctrl(rdev, true);
1945 rdev->ena_gpio_state = 1;
1947 } else if (rdev->desc->ops->enable) {
1948 ret = rdev->desc->ops->enable(rdev);
1955 /* Allow the regulator to ramp; it would be useful to extend
1956 * this for bulk operations so that the regulators can ramp
1958 trace_regulator_enable_delay(rdev_get_name(rdev));
1960 _regulator_enable_delay(delay);
1962 trace_regulator_enable_complete(rdev_get_name(rdev));
1967 /* locks held by regulator_enable() */
1968 static int _regulator_enable(struct regulator_dev *rdev)
1972 /* check voltage and requested load before enabling */
1973 if (rdev->constraints &&
1974 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1975 drms_uA_update(rdev);
1977 if (rdev->use_count == 0) {
1978 /* The regulator may on if it's not switchable or left on */
1979 ret = _regulator_is_enabled(rdev);
1980 if (ret == -EINVAL || ret == 0) {
1981 if (!_regulator_can_change_status(rdev))
1984 ret = _regulator_do_enable(rdev);
1988 } else if (ret < 0) {
1989 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1992 /* Fallthrough on positive return values - already enabled */
2001 * regulator_enable - enable regulator output
2002 * @regulator: regulator source
2004 * Request that the regulator be enabled with the regulator output at
2005 * the predefined voltage or current value. Calls to regulator_enable()
2006 * must be balanced with calls to regulator_disable().
2008 * NOTE: the output value can be set by other drivers, boot loader or may be
2009 * hardwired in the regulator.
2011 int regulator_enable(struct regulator *regulator)
2013 struct regulator_dev *rdev = regulator->rdev;
2016 if (regulator->always_on)
2020 ret = regulator_enable(rdev->supply);
2025 mutex_lock(&rdev->mutex);
2026 ret = _regulator_enable(rdev);
2027 mutex_unlock(&rdev->mutex);
2029 if (ret != 0 && rdev->supply)
2030 regulator_disable(rdev->supply);
2034 EXPORT_SYMBOL_GPL(regulator_enable);
2036 static int _regulator_do_disable(struct regulator_dev *rdev)
2040 trace_regulator_disable(rdev_get_name(rdev));
2042 if (rdev->ena_pin) {
2043 if (rdev->ena_gpio_state) {
2044 ret = regulator_ena_gpio_ctrl(rdev, false);
2047 rdev->ena_gpio_state = 0;
2050 } else if (rdev->desc->ops->disable) {
2051 ret = rdev->desc->ops->disable(rdev);
2056 /* cares about last_off_jiffy only if off_on_delay is required by
2059 if (rdev->desc->off_on_delay)
2060 rdev->last_off_jiffy = jiffies;
2062 trace_regulator_disable_complete(rdev_get_name(rdev));
2067 /* locks held by regulator_disable() */
2068 static int _regulator_disable(struct regulator_dev *rdev)
2072 if (WARN(rdev->use_count <= 0,
2073 "unbalanced disables for %s\n", rdev_get_name(rdev)))
2076 /* are we the last user and permitted to disable ? */
2077 if (rdev->use_count == 1 &&
2078 (rdev->constraints && !rdev->constraints->always_on)) {
2080 /* we are last user */
2081 if (_regulator_can_change_status(rdev)) {
2082 ret = _notifier_call_chain(rdev,
2083 REGULATOR_EVENT_PRE_DISABLE,
2085 if (ret & NOTIFY_STOP_MASK)
2088 ret = _regulator_do_disable(rdev);
2090 rdev_err(rdev, "failed to disable\n");
2091 _notifier_call_chain(rdev,
2092 REGULATOR_EVENT_ABORT_DISABLE,
2096 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2100 rdev->use_count = 0;
2101 } else if (rdev->use_count > 1) {
2103 if (rdev->constraints &&
2104 (rdev->constraints->valid_ops_mask &
2105 REGULATOR_CHANGE_DRMS))
2106 drms_uA_update(rdev);
2115 * regulator_disable - disable regulator output
2116 * @regulator: regulator source
2118 * Disable the regulator output voltage or current. Calls to
2119 * regulator_enable() must be balanced with calls to
2120 * regulator_disable().
2122 * NOTE: this will only disable the regulator output if no other consumer
2123 * devices have it enabled, the regulator device supports disabling and
2124 * machine constraints permit this operation.
2126 int regulator_disable(struct regulator *regulator)
2128 struct regulator_dev *rdev = regulator->rdev;
2131 if (regulator->always_on)
2134 mutex_lock(&rdev->mutex);
2135 ret = _regulator_disable(rdev);
2136 mutex_unlock(&rdev->mutex);
2138 if (ret == 0 && rdev->supply)
2139 regulator_disable(rdev->supply);
2143 EXPORT_SYMBOL_GPL(regulator_disable);
2145 /* locks held by regulator_force_disable() */
2146 static int _regulator_force_disable(struct regulator_dev *rdev)
2150 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2151 REGULATOR_EVENT_PRE_DISABLE, NULL);
2152 if (ret & NOTIFY_STOP_MASK)
2155 ret = _regulator_do_disable(rdev);
2157 rdev_err(rdev, "failed to force disable\n");
2158 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2159 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2163 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2164 REGULATOR_EVENT_DISABLE, NULL);
2170 * regulator_force_disable - force disable regulator output
2171 * @regulator: regulator source
2173 * Forcibly disable the regulator output voltage or current.
2174 * NOTE: this *will* disable the regulator output even if other consumer
2175 * devices have it enabled. This should be used for situations when device
2176 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2178 int regulator_force_disable(struct regulator *regulator)
2180 struct regulator_dev *rdev = regulator->rdev;
2183 mutex_lock(&rdev->mutex);
2184 regulator->uA_load = 0;
2185 ret = _regulator_force_disable(regulator->rdev);
2186 mutex_unlock(&rdev->mutex);
2189 while (rdev->open_count--)
2190 regulator_disable(rdev->supply);
2194 EXPORT_SYMBOL_GPL(regulator_force_disable);
2196 static void regulator_disable_work(struct work_struct *work)
2198 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2202 mutex_lock(&rdev->mutex);
2204 BUG_ON(!rdev->deferred_disables);
2206 count = rdev->deferred_disables;
2207 rdev->deferred_disables = 0;
2209 for (i = 0; i < count; i++) {
2210 ret = _regulator_disable(rdev);
2212 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2215 mutex_unlock(&rdev->mutex);
2218 for (i = 0; i < count; i++) {
2219 ret = regulator_disable(rdev->supply);
2222 "Supply disable failed: %d\n", ret);
2229 * regulator_disable_deferred - disable regulator output with delay
2230 * @regulator: regulator source
2231 * @ms: miliseconds until the regulator is disabled
2233 * Execute regulator_disable() on the regulator after a delay. This
2234 * is intended for use with devices that require some time to quiesce.
2236 * NOTE: this will only disable the regulator output if no other consumer
2237 * devices have it enabled, the regulator device supports disabling and
2238 * machine constraints permit this operation.
2240 int regulator_disable_deferred(struct regulator *regulator, int ms)
2242 struct regulator_dev *rdev = regulator->rdev;
2245 if (regulator->always_on)
2249 return regulator_disable(regulator);
2251 mutex_lock(&rdev->mutex);
2252 rdev->deferred_disables++;
2253 mutex_unlock(&rdev->mutex);
2255 ret = queue_delayed_work(system_power_efficient_wq,
2256 &rdev->disable_work,
2257 msecs_to_jiffies(ms));
2263 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2265 static int _regulator_is_enabled(struct regulator_dev *rdev)
2267 /* A GPIO control always takes precedence */
2269 return rdev->ena_gpio_state;
2271 /* If we don't know then assume that the regulator is always on */
2272 if (!rdev->desc->ops->is_enabled)
2275 return rdev->desc->ops->is_enabled(rdev);
2279 * regulator_is_enabled - is the regulator output enabled
2280 * @regulator: regulator source
2282 * Returns positive if the regulator driver backing the source/client
2283 * has requested that the device be enabled, zero if it hasn't, else a
2284 * negative errno code.
2286 * Note that the device backing this regulator handle can have multiple
2287 * users, so it might be enabled even if regulator_enable() was never
2288 * called for this particular source.
2290 int regulator_is_enabled(struct regulator *regulator)
2294 if (regulator->always_on)
2297 mutex_lock(®ulator->rdev->mutex);
2298 ret = _regulator_is_enabled(regulator->rdev);
2299 mutex_unlock(®ulator->rdev->mutex);
2303 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2306 * regulator_can_change_voltage - check if regulator can change voltage
2307 * @regulator: regulator source
2309 * Returns positive if the regulator driver backing the source/client
2310 * can change its voltage, false otherwise. Useful for detecting fixed
2311 * or dummy regulators and disabling voltage change logic in the client
2314 int regulator_can_change_voltage(struct regulator *regulator)
2316 struct regulator_dev *rdev = regulator->rdev;
2318 if (rdev->constraints &&
2319 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2320 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2323 if (rdev->desc->continuous_voltage_range &&
2324 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2325 rdev->constraints->min_uV != rdev->constraints->max_uV)
2331 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2334 * regulator_count_voltages - count regulator_list_voltage() selectors
2335 * @regulator: regulator source
2337 * Returns number of selectors, or negative errno. Selectors are
2338 * numbered starting at zero, and typically correspond to bitfields
2339 * in hardware registers.
2341 int regulator_count_voltages(struct regulator *regulator)
2343 struct regulator_dev *rdev = regulator->rdev;
2345 if (rdev->desc->n_voltages)
2346 return rdev->desc->n_voltages;
2351 return regulator_count_voltages(rdev->supply);
2353 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2356 * regulator_list_voltage - enumerate supported voltages
2357 * @regulator: regulator source
2358 * @selector: identify voltage to list
2359 * Context: can sleep
2361 * Returns a voltage that can be passed to @regulator_set_voltage(),
2362 * zero if this selector code can't be used on this system, or a
2365 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2367 struct regulator_dev *rdev = regulator->rdev;
2368 const struct regulator_ops *ops = rdev->desc->ops;
2371 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2372 return rdev->desc->fixed_uV;
2374 if (ops->list_voltage) {
2375 if (selector >= rdev->desc->n_voltages)
2377 mutex_lock(&rdev->mutex);
2378 ret = ops->list_voltage(rdev, selector);
2379 mutex_unlock(&rdev->mutex);
2380 } else if (rdev->supply) {
2381 ret = regulator_list_voltage(rdev->supply, selector);
2387 if (ret < rdev->constraints->min_uV)
2389 else if (ret > rdev->constraints->max_uV)
2395 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2398 * regulator_get_regmap - get the regulator's register map
2399 * @regulator: regulator source
2401 * Returns the register map for the given regulator, or an ERR_PTR value
2402 * if the regulator doesn't use regmap.
2404 struct regmap *regulator_get_regmap(struct regulator *regulator)
2406 struct regmap *map = regulator->rdev->regmap;
2408 return map ? map : ERR_PTR(-EOPNOTSUPP);
2412 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2413 * @regulator: regulator source
2414 * @vsel_reg: voltage selector register, output parameter
2415 * @vsel_mask: mask for voltage selector bitfield, output parameter
2417 * Returns the hardware register offset and bitmask used for setting the
2418 * regulator voltage. This might be useful when configuring voltage-scaling
2419 * hardware or firmware that can make I2C requests behind the kernel's back,
2422 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2423 * and 0 is returned, otherwise a negative errno is returned.
2425 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2427 unsigned *vsel_mask)
2429 struct regulator_dev *rdev = regulator->rdev;
2430 const struct regulator_ops *ops = rdev->desc->ops;
2432 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2435 *vsel_reg = rdev->desc->vsel_reg;
2436 *vsel_mask = rdev->desc->vsel_mask;
2440 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2443 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2444 * @regulator: regulator source
2445 * @selector: identify voltage to list
2447 * Converts the selector to a hardware-specific voltage selector that can be
2448 * directly written to the regulator registers. The address of the voltage
2449 * register can be determined by calling @regulator_get_hardware_vsel_register.
2451 * On error a negative errno is returned.
2453 int regulator_list_hardware_vsel(struct regulator *regulator,
2456 struct regulator_dev *rdev = regulator->rdev;
2457 const struct regulator_ops *ops = rdev->desc->ops;
2459 if (selector >= rdev->desc->n_voltages)
2461 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2466 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2469 * regulator_get_linear_step - return the voltage step size between VSEL values
2470 * @regulator: regulator source
2472 * Returns the voltage step size between VSEL values for linear
2473 * regulators, or return 0 if the regulator isn't a linear regulator.
2475 unsigned int regulator_get_linear_step(struct regulator *regulator)
2477 struct regulator_dev *rdev = regulator->rdev;
2479 return rdev->desc->uV_step;
2481 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2484 * regulator_is_supported_voltage - check if a voltage range can be supported
2486 * @regulator: Regulator to check.
2487 * @min_uV: Minimum required voltage in uV.
2488 * @max_uV: Maximum required voltage in uV.
2490 * Returns a boolean or a negative error code.
2492 int regulator_is_supported_voltage(struct regulator *regulator,
2493 int min_uV, int max_uV)
2495 struct regulator_dev *rdev = regulator->rdev;
2496 int i, voltages, ret;
2498 /* If we can't change voltage check the current voltage */
2499 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2500 ret = regulator_get_voltage(regulator);
2502 return min_uV <= ret && ret <= max_uV;
2507 /* Any voltage within constrains range is fine? */
2508 if (rdev->desc->continuous_voltage_range)
2509 return min_uV >= rdev->constraints->min_uV &&
2510 max_uV <= rdev->constraints->max_uV;
2512 ret = regulator_count_voltages(regulator);
2517 for (i = 0; i < voltages; i++) {
2518 ret = regulator_list_voltage(regulator, i);
2520 if (ret >= min_uV && ret <= max_uV)
2526 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2528 static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2529 int min_uV, int max_uV,
2532 struct pre_voltage_change_data data;
2535 data.old_uV = _regulator_get_voltage(rdev);
2536 data.min_uV = min_uV;
2537 data.max_uV = max_uV;
2538 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2540 if (ret & NOTIFY_STOP_MASK)
2543 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2547 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2548 (void *)data.old_uV);
2553 static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2554 int uV, unsigned selector)
2556 struct pre_voltage_change_data data;
2559 data.old_uV = _regulator_get_voltage(rdev);
2562 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2564 if (ret & NOTIFY_STOP_MASK)
2567 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2571 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2572 (void *)data.old_uV);
2577 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2578 int min_uV, int max_uV)
2583 unsigned int selector;
2584 int old_selector = -1;
2586 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2588 min_uV += rdev->constraints->uV_offset;
2589 max_uV += rdev->constraints->uV_offset;
2592 * If we can't obtain the old selector there is not enough
2593 * info to call set_voltage_time_sel().
2595 if (_regulator_is_enabled(rdev) &&
2596 rdev->desc->ops->set_voltage_time_sel &&
2597 rdev->desc->ops->get_voltage_sel) {
2598 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2599 if (old_selector < 0)
2600 return old_selector;
2603 if (rdev->desc->ops->set_voltage) {
2604 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2608 if (rdev->desc->ops->list_voltage)
2609 best_val = rdev->desc->ops->list_voltage(rdev,
2612 best_val = _regulator_get_voltage(rdev);
2615 } else if (rdev->desc->ops->set_voltage_sel) {
2616 if (rdev->desc->ops->map_voltage) {
2617 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2620 if (rdev->desc->ops->list_voltage ==
2621 regulator_list_voltage_linear)
2622 ret = regulator_map_voltage_linear(rdev,
2624 else if (rdev->desc->ops->list_voltage ==
2625 regulator_list_voltage_linear_range)
2626 ret = regulator_map_voltage_linear_range(rdev,
2629 ret = regulator_map_voltage_iterate(rdev,
2634 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2635 if (min_uV <= best_val && max_uV >= best_val) {
2637 if (old_selector == selector)
2640 ret = _regulator_call_set_voltage_sel(
2641 rdev, best_val, selector);
2650 /* Call set_voltage_time_sel if successfully obtained old_selector */
2651 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2652 && old_selector != selector) {
2654 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2655 old_selector, selector);
2657 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2662 /* Insert any necessary delays */
2663 if (delay >= 1000) {
2664 mdelay(delay / 1000);
2665 udelay(delay % 1000);
2671 if (ret == 0 && best_val >= 0) {
2672 unsigned long data = best_val;
2674 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2678 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2684 * regulator_set_voltage - set regulator output voltage
2685 * @regulator: regulator source
2686 * @min_uV: Minimum required voltage in uV
2687 * @max_uV: Maximum acceptable voltage in uV
2689 * Sets a voltage regulator to the desired output voltage. This can be set
2690 * during any regulator state. IOW, regulator can be disabled or enabled.
2692 * If the regulator is enabled then the voltage will change to the new value
2693 * immediately otherwise if the regulator is disabled the regulator will
2694 * output at the new voltage when enabled.
2696 * NOTE: If the regulator is shared between several devices then the lowest
2697 * request voltage that meets the system constraints will be used.
2698 * Regulator system constraints must be set for this regulator before
2699 * calling this function otherwise this call will fail.
2701 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2703 struct regulator_dev *rdev = regulator->rdev;
2705 int old_min_uV, old_max_uV;
2708 mutex_lock(&rdev->mutex);
2710 /* If we're setting the same range as last time the change
2711 * should be a noop (some cpufreq implementations use the same
2712 * voltage for multiple frequencies, for example).
2714 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2717 /* If we're trying to set a range that overlaps the current voltage,
2718 * return succesfully even though the regulator does not support
2719 * changing the voltage.
2721 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2722 current_uV = _regulator_get_voltage(rdev);
2723 if (min_uV <= current_uV && current_uV <= max_uV) {
2724 regulator->min_uV = min_uV;
2725 regulator->max_uV = max_uV;
2731 if (!rdev->desc->ops->set_voltage &&
2732 !rdev->desc->ops->set_voltage_sel) {
2737 /* constraints check */
2738 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2742 /* restore original values in case of error */
2743 old_min_uV = regulator->min_uV;
2744 old_max_uV = regulator->max_uV;
2745 regulator->min_uV = min_uV;
2746 regulator->max_uV = max_uV;
2748 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2752 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2757 mutex_unlock(&rdev->mutex);
2760 regulator->min_uV = old_min_uV;
2761 regulator->max_uV = old_max_uV;
2762 mutex_unlock(&rdev->mutex);
2765 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2768 * regulator_set_voltage_time - get raise/fall time
2769 * @regulator: regulator source
2770 * @old_uV: starting voltage in microvolts
2771 * @new_uV: target voltage in microvolts
2773 * Provided with the starting and ending voltage, this function attempts to
2774 * calculate the time in microseconds required to rise or fall to this new
2777 int regulator_set_voltage_time(struct regulator *regulator,
2778 int old_uV, int new_uV)
2780 struct regulator_dev *rdev = regulator->rdev;
2781 const struct regulator_ops *ops = rdev->desc->ops;
2787 /* Currently requires operations to do this */
2788 if (!ops->list_voltage || !ops->set_voltage_time_sel
2789 || !rdev->desc->n_voltages)
2792 for (i = 0; i < rdev->desc->n_voltages; i++) {
2793 /* We only look for exact voltage matches here */
2794 voltage = regulator_list_voltage(regulator, i);
2799 if (voltage == old_uV)
2801 if (voltage == new_uV)
2805 if (old_sel < 0 || new_sel < 0)
2808 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2810 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2813 * regulator_set_voltage_time_sel - get raise/fall time
2814 * @rdev: regulator source device
2815 * @old_selector: selector for starting voltage
2816 * @new_selector: selector for target voltage
2818 * Provided with the starting and target voltage selectors, this function
2819 * returns time in microseconds required to rise or fall to this new voltage
2821 * Drivers providing ramp_delay in regulation_constraints can use this as their
2822 * set_voltage_time_sel() operation.
2824 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2825 unsigned int old_selector,
2826 unsigned int new_selector)
2828 unsigned int ramp_delay = 0;
2829 int old_volt, new_volt;
2831 if (rdev->constraints->ramp_delay)
2832 ramp_delay = rdev->constraints->ramp_delay;
2833 else if (rdev->desc->ramp_delay)
2834 ramp_delay = rdev->desc->ramp_delay;
2836 if (ramp_delay == 0) {
2837 rdev_warn(rdev, "ramp_delay not set\n");
2842 if (!rdev->desc->ops->list_voltage)
2845 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2846 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2848 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2850 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2853 * regulator_sync_voltage - re-apply last regulator output voltage
2854 * @regulator: regulator source
2856 * Re-apply the last configured voltage. This is intended to be used
2857 * where some external control source the consumer is cooperating with
2858 * has caused the configured voltage to change.
2860 int regulator_sync_voltage(struct regulator *regulator)
2862 struct regulator_dev *rdev = regulator->rdev;
2863 int ret, min_uV, max_uV;
2865 mutex_lock(&rdev->mutex);
2867 if (!rdev->desc->ops->set_voltage &&
2868 !rdev->desc->ops->set_voltage_sel) {
2873 /* This is only going to work if we've had a voltage configured. */
2874 if (!regulator->min_uV && !regulator->max_uV) {
2879 min_uV = regulator->min_uV;
2880 max_uV = regulator->max_uV;
2882 /* This should be a paranoia check... */
2883 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2887 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2891 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2894 mutex_unlock(&rdev->mutex);
2897 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2899 static int _regulator_get_voltage(struct regulator_dev *rdev)
2903 if (rdev->desc->ops->get_voltage_sel) {
2904 sel = rdev->desc->ops->get_voltage_sel(rdev);
2907 ret = rdev->desc->ops->list_voltage(rdev, sel);
2908 } else if (rdev->desc->ops->get_voltage) {
2909 ret = rdev->desc->ops->get_voltage(rdev);
2910 } else if (rdev->desc->ops->list_voltage) {
2911 ret = rdev->desc->ops->list_voltage(rdev, 0);
2912 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
2913 ret = rdev->desc->fixed_uV;
2914 } else if (rdev->supply) {
2915 ret = regulator_get_voltage(rdev->supply);
2922 return ret - rdev->constraints->uV_offset;
2926 * regulator_get_voltage - get regulator output voltage
2927 * @regulator: regulator source
2929 * This returns the current regulator voltage in uV.
2931 * NOTE: If the regulator is disabled it will return the voltage value. This
2932 * function should not be used to determine regulator state.
2934 int regulator_get_voltage(struct regulator *regulator)
2938 mutex_lock(®ulator->rdev->mutex);
2940 ret = _regulator_get_voltage(regulator->rdev);
2942 mutex_unlock(®ulator->rdev->mutex);
2946 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2949 * regulator_set_current_limit - set regulator output current limit
2950 * @regulator: regulator source
2951 * @min_uA: Minimum supported current in uA
2952 * @max_uA: Maximum supported current in uA
2954 * Sets current sink to the desired output current. This can be set during
2955 * any regulator state. IOW, regulator can be disabled or enabled.
2957 * If the regulator is enabled then the current will change to the new value
2958 * immediately otherwise if the regulator is disabled the regulator will
2959 * output at the new current when enabled.
2961 * NOTE: Regulator system constraints must be set for this regulator before
2962 * calling this function otherwise this call will fail.
2964 int regulator_set_current_limit(struct regulator *regulator,
2965 int min_uA, int max_uA)
2967 struct regulator_dev *rdev = regulator->rdev;
2970 mutex_lock(&rdev->mutex);
2973 if (!rdev->desc->ops->set_current_limit) {
2978 /* constraints check */
2979 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2983 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2985 mutex_unlock(&rdev->mutex);
2988 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2990 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2994 mutex_lock(&rdev->mutex);
2997 if (!rdev->desc->ops->get_current_limit) {
3002 ret = rdev->desc->ops->get_current_limit(rdev);
3004 mutex_unlock(&rdev->mutex);
3009 * regulator_get_current_limit - get regulator output current
3010 * @regulator: regulator source
3012 * This returns the current supplied by the specified current sink in uA.
3014 * NOTE: If the regulator is disabled it will return the current value. This
3015 * function should not be used to determine regulator state.
3017 int regulator_get_current_limit(struct regulator *regulator)
3019 return _regulator_get_current_limit(regulator->rdev);
3021 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3024 * regulator_set_mode - set regulator operating mode
3025 * @regulator: regulator source
3026 * @mode: operating mode - one of the REGULATOR_MODE constants
3028 * Set regulator operating mode to increase regulator efficiency or improve
3029 * regulation performance.
3031 * NOTE: Regulator system constraints must be set for this regulator before
3032 * calling this function otherwise this call will fail.
3034 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3036 struct regulator_dev *rdev = regulator->rdev;
3038 int regulator_curr_mode;
3040 mutex_lock(&rdev->mutex);
3043 if (!rdev->desc->ops->set_mode) {
3048 /* return if the same mode is requested */
3049 if (rdev->desc->ops->get_mode) {
3050 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3051 if (regulator_curr_mode == mode) {
3057 /* constraints check */
3058 ret = regulator_mode_constrain(rdev, &mode);
3062 ret = rdev->desc->ops->set_mode(rdev, mode);
3064 mutex_unlock(&rdev->mutex);
3067 EXPORT_SYMBOL_GPL(regulator_set_mode);
3069 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3073 mutex_lock(&rdev->mutex);
3076 if (!rdev->desc->ops->get_mode) {
3081 ret = rdev->desc->ops->get_mode(rdev);
3083 mutex_unlock(&rdev->mutex);
3088 * regulator_get_mode - get regulator operating mode
3089 * @regulator: regulator source
3091 * Get the current regulator operating mode.
3093 unsigned int regulator_get_mode(struct regulator *regulator)
3095 return _regulator_get_mode(regulator->rdev);
3097 EXPORT_SYMBOL_GPL(regulator_get_mode);
3100 * regulator_set_load - set regulator load
3101 * @regulator: regulator source
3102 * @uA_load: load current
3104 * Notifies the regulator core of a new device load. This is then used by
3105 * DRMS (if enabled by constraints) to set the most efficient regulator
3106 * operating mode for the new regulator loading.
3108 * Consumer devices notify their supply regulator of the maximum power
3109 * they will require (can be taken from device datasheet in the power
3110 * consumption tables) when they change operational status and hence power
3111 * state. Examples of operational state changes that can affect power
3112 * consumption are :-
3114 * o Device is opened / closed.
3115 * o Device I/O is about to begin or has just finished.
3116 * o Device is idling in between work.
3118 * This information is also exported via sysfs to userspace.
3120 * DRMS will sum the total requested load on the regulator and change
3121 * to the most efficient operating mode if platform constraints allow.
3123 * On error a negative errno is returned.
3125 int regulator_set_load(struct regulator *regulator, int uA_load)
3127 struct regulator_dev *rdev = regulator->rdev;
3130 mutex_lock(&rdev->mutex);
3131 regulator->uA_load = uA_load;
3132 ret = drms_uA_update(rdev);
3133 mutex_unlock(&rdev->mutex);
3137 EXPORT_SYMBOL_GPL(regulator_set_load);
3140 * regulator_allow_bypass - allow the regulator to go into bypass mode
3142 * @regulator: Regulator to configure
3143 * @enable: enable or disable bypass mode
3145 * Allow the regulator to go into bypass mode if all other consumers
3146 * for the regulator also enable bypass mode and the machine
3147 * constraints allow this. Bypass mode means that the regulator is
3148 * simply passing the input directly to the output with no regulation.
3150 int regulator_allow_bypass(struct regulator *regulator, bool enable)
3152 struct regulator_dev *rdev = regulator->rdev;
3155 if (!rdev->desc->ops->set_bypass)
3158 if (rdev->constraints &&
3159 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3162 mutex_lock(&rdev->mutex);
3164 if (enable && !regulator->bypass) {
3165 rdev->bypass_count++;
3167 if (rdev->bypass_count == rdev->open_count) {
3168 ret = rdev->desc->ops->set_bypass(rdev, enable);
3170 rdev->bypass_count--;
3173 } else if (!enable && regulator->bypass) {
3174 rdev->bypass_count--;
3176 if (rdev->bypass_count != rdev->open_count) {
3177 ret = rdev->desc->ops->set_bypass(rdev, enable);
3179 rdev->bypass_count++;
3184 regulator->bypass = enable;
3186 mutex_unlock(&rdev->mutex);
3190 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3193 * regulator_register_notifier - register regulator event notifier
3194 * @regulator: regulator source
3195 * @nb: notifier block
3197 * Register notifier block to receive regulator events.
3199 int regulator_register_notifier(struct regulator *regulator,
3200 struct notifier_block *nb)
3202 return blocking_notifier_chain_register(®ulator->rdev->notifier,
3205 EXPORT_SYMBOL_GPL(regulator_register_notifier);
3208 * regulator_unregister_notifier - unregister regulator event notifier
3209 * @regulator: regulator source
3210 * @nb: notifier block
3212 * Unregister regulator event notifier block.
3214 int regulator_unregister_notifier(struct regulator *regulator,
3215 struct notifier_block *nb)
3217 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
3220 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3222 /* notify regulator consumers and downstream regulator consumers.
3223 * Note mutex must be held by caller.
3225 static int _notifier_call_chain(struct regulator_dev *rdev,
3226 unsigned long event, void *data)
3228 /* call rdev chain first */
3229 return blocking_notifier_call_chain(&rdev->notifier, event, data);
3233 * regulator_bulk_get - get multiple regulator consumers
3235 * @dev: Device to supply
3236 * @num_consumers: Number of consumers to register
3237 * @consumers: Configuration of consumers; clients are stored here.
3239 * @return 0 on success, an errno on failure.
3241 * This helper function allows drivers to get several regulator
3242 * consumers in one operation. If any of the regulators cannot be
3243 * acquired then any regulators that were allocated will be freed
3244 * before returning to the caller.
3246 int regulator_bulk_get(struct device *dev, int num_consumers,
3247 struct regulator_bulk_data *consumers)
3252 for (i = 0; i < num_consumers; i++)
3253 consumers[i].consumer = NULL;
3255 for (i = 0; i < num_consumers; i++) {
3256 consumers[i].consumer = regulator_get(dev,
3257 consumers[i].supply);
3258 if (IS_ERR(consumers[i].consumer)) {
3259 ret = PTR_ERR(consumers[i].consumer);
3260 dev_err(dev, "Failed to get supply '%s': %d\n",
3261 consumers[i].supply, ret);
3262 consumers[i].consumer = NULL;
3271 regulator_put(consumers[i].consumer);
3275 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3277 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3279 struct regulator_bulk_data *bulk = data;
3281 bulk->ret = regulator_enable(bulk->consumer);
3285 * regulator_bulk_enable - enable multiple regulator consumers
3287 * @num_consumers: Number of consumers
3288 * @consumers: Consumer data; clients are stored here.
3289 * @return 0 on success, an errno on failure
3291 * This convenience API allows consumers to enable multiple regulator
3292 * clients in a single API call. If any consumers cannot be enabled
3293 * then any others that were enabled will be disabled again prior to
3296 int regulator_bulk_enable(int num_consumers,
3297 struct regulator_bulk_data *consumers)
3299 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3303 for (i = 0; i < num_consumers; i++) {
3304 if (consumers[i].consumer->always_on)
3305 consumers[i].ret = 0;
3307 async_schedule_domain(regulator_bulk_enable_async,
3308 &consumers[i], &async_domain);
3311 async_synchronize_full_domain(&async_domain);
3313 /* If any consumer failed we need to unwind any that succeeded */
3314 for (i = 0; i < num_consumers; i++) {
3315 if (consumers[i].ret != 0) {
3316 ret = consumers[i].ret;
3324 for (i = 0; i < num_consumers; i++) {
3325 if (consumers[i].ret < 0)
3326 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3329 regulator_disable(consumers[i].consumer);
3334 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3337 * regulator_bulk_disable - disable multiple regulator consumers
3339 * @num_consumers: Number of consumers
3340 * @consumers: Consumer data; clients are stored here.
3341 * @return 0 on success, an errno on failure
3343 * This convenience API allows consumers to disable multiple regulator
3344 * clients in a single API call. If any consumers cannot be disabled
3345 * then any others that were disabled will be enabled again prior to
3348 int regulator_bulk_disable(int num_consumers,
3349 struct regulator_bulk_data *consumers)
3354 for (i = num_consumers - 1; i >= 0; --i) {
3355 ret = regulator_disable(consumers[i].consumer);
3363 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3364 for (++i; i < num_consumers; ++i) {
3365 r = regulator_enable(consumers[i].consumer);
3367 pr_err("Failed to reename %s: %d\n",
3368 consumers[i].supply, r);
3373 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3376 * regulator_bulk_force_disable - force disable multiple regulator consumers
3378 * @num_consumers: Number of consumers
3379 * @consumers: Consumer data; clients are stored here.
3380 * @return 0 on success, an errno on failure
3382 * This convenience API allows consumers to forcibly disable multiple regulator
3383 * clients in a single API call.
3384 * NOTE: This should be used for situations when device damage will
3385 * likely occur if the regulators are not disabled (e.g. over temp).
3386 * Although regulator_force_disable function call for some consumers can
3387 * return error numbers, the function is called for all consumers.
3389 int regulator_bulk_force_disable(int num_consumers,
3390 struct regulator_bulk_data *consumers)
3395 for (i = 0; i < num_consumers; i++)
3397 regulator_force_disable(consumers[i].consumer);
3399 for (i = 0; i < num_consumers; i++) {
3400 if (consumers[i].ret != 0) {
3401 ret = consumers[i].ret;
3410 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3413 * regulator_bulk_free - free multiple regulator consumers
3415 * @num_consumers: Number of consumers
3416 * @consumers: Consumer data; clients are stored here.
3418 * This convenience API allows consumers to free multiple regulator
3419 * clients in a single API call.
3421 void regulator_bulk_free(int num_consumers,
3422 struct regulator_bulk_data *consumers)
3426 for (i = 0; i < num_consumers; i++) {
3427 regulator_put(consumers[i].consumer);
3428 consumers[i].consumer = NULL;
3431 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3434 * regulator_notifier_call_chain - call regulator event notifier
3435 * @rdev: regulator source
3436 * @event: notifier block
3437 * @data: callback-specific data.
3439 * Called by regulator drivers to notify clients a regulator event has
3440 * occurred. We also notify regulator clients downstream.
3441 * Note lock must be held by caller.
3443 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3444 unsigned long event, void *data)
3446 _notifier_call_chain(rdev, event, data);
3450 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3453 * regulator_mode_to_status - convert a regulator mode into a status
3455 * @mode: Mode to convert
3457 * Convert a regulator mode into a status.
3459 int regulator_mode_to_status(unsigned int mode)
3462 case REGULATOR_MODE_FAST:
3463 return REGULATOR_STATUS_FAST;
3464 case REGULATOR_MODE_NORMAL:
3465 return REGULATOR_STATUS_NORMAL;
3466 case REGULATOR_MODE_IDLE:
3467 return REGULATOR_STATUS_IDLE;
3468 case REGULATOR_MODE_STANDBY:
3469 return REGULATOR_STATUS_STANDBY;
3471 return REGULATOR_STATUS_UNDEFINED;
3474 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3476 static struct attribute *regulator_dev_attrs[] = {
3477 &dev_attr_name.attr,
3478 &dev_attr_num_users.attr,
3479 &dev_attr_type.attr,
3480 &dev_attr_microvolts.attr,
3481 &dev_attr_microamps.attr,
3482 &dev_attr_opmode.attr,
3483 &dev_attr_state.attr,
3484 &dev_attr_status.attr,
3485 &dev_attr_bypass.attr,
3486 &dev_attr_requested_microamps.attr,
3487 &dev_attr_min_microvolts.attr,
3488 &dev_attr_max_microvolts.attr,
3489 &dev_attr_min_microamps.attr,
3490 &dev_attr_max_microamps.attr,
3491 &dev_attr_suspend_standby_state.attr,
3492 &dev_attr_suspend_mem_state.attr,
3493 &dev_attr_suspend_disk_state.attr,
3494 &dev_attr_suspend_standby_microvolts.attr,
3495 &dev_attr_suspend_mem_microvolts.attr,
3496 &dev_attr_suspend_disk_microvolts.attr,
3497 &dev_attr_suspend_standby_mode.attr,
3498 &dev_attr_suspend_mem_mode.attr,
3499 &dev_attr_suspend_disk_mode.attr,
3504 * To avoid cluttering sysfs (and memory) with useless state, only
3505 * create attributes that can be meaningfully displayed.
3507 static umode_t regulator_attr_is_visible(struct kobject *kobj,
3508 struct attribute *attr, int idx)
3510 struct device *dev = kobj_to_dev(kobj);
3511 struct regulator_dev *rdev = container_of(dev, struct regulator_dev, dev);
3512 const struct regulator_ops *ops = rdev->desc->ops;
3513 umode_t mode = attr->mode;
3515 /* these three are always present */
3516 if (attr == &dev_attr_name.attr ||
3517 attr == &dev_attr_num_users.attr ||
3518 attr == &dev_attr_type.attr)
3521 /* some attributes need specific methods to be displayed */
3522 if (attr == &dev_attr_microvolts.attr) {
3523 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3524 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3525 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3526 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3531 if (attr == &dev_attr_microamps.attr)
3532 return ops->get_current_limit ? mode : 0;
3534 if (attr == &dev_attr_opmode.attr)
3535 return ops->get_mode ? mode : 0;
3537 if (attr == &dev_attr_state.attr)
3538 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3540 if (attr == &dev_attr_status.attr)
3541 return ops->get_status ? mode : 0;
3543 if (attr == &dev_attr_bypass.attr)
3544 return ops->get_bypass ? mode : 0;
3546 /* some attributes are type-specific */
3547 if (attr == &dev_attr_requested_microamps.attr)
3548 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
3550 /* constraints need specific supporting methods */
3551 if (attr == &dev_attr_min_microvolts.attr ||
3552 attr == &dev_attr_max_microvolts.attr)
3553 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3555 if (attr == &dev_attr_min_microamps.attr ||
3556 attr == &dev_attr_max_microamps.attr)
3557 return ops->set_current_limit ? mode : 0;
3559 if (attr == &dev_attr_suspend_standby_state.attr ||
3560 attr == &dev_attr_suspend_mem_state.attr ||
3561 attr == &dev_attr_suspend_disk_state.attr)
3564 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3565 attr == &dev_attr_suspend_mem_microvolts.attr ||
3566 attr == &dev_attr_suspend_disk_microvolts.attr)
3567 return ops->set_suspend_voltage ? mode : 0;
3569 if (attr == &dev_attr_suspend_standby_mode.attr ||
3570 attr == &dev_attr_suspend_mem_mode.attr ||
3571 attr == &dev_attr_suspend_disk_mode.attr)
3572 return ops->set_suspend_mode ? mode : 0;
3577 static const struct attribute_group regulator_dev_group = {
3578 .attrs = regulator_dev_attrs,
3579 .is_visible = regulator_attr_is_visible,
3582 static const struct attribute_group *regulator_dev_groups[] = {
3583 ®ulator_dev_group,
3587 static void regulator_dev_release(struct device *dev)
3589 struct regulator_dev *rdev = dev_get_drvdata(dev);
3593 static struct class regulator_class = {
3594 .name = "regulator",
3595 .dev_release = regulator_dev_release,
3596 .dev_groups = regulator_dev_groups,
3599 static void rdev_init_debugfs(struct regulator_dev *rdev)
3601 struct device *parent = rdev->dev.parent;
3602 const char *rname = rdev_get_name(rdev);
3603 char name[NAME_MAX];
3605 /* Avoid duplicate debugfs directory names */
3606 if (parent && rname == rdev->desc->name) {
3607 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3612 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
3613 if (!rdev->debugfs) {
3614 rdev_warn(rdev, "Failed to create debugfs directory\n");
3618 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3620 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3622 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3623 &rdev->bypass_count);
3627 * regulator_register - register regulator
3628 * @regulator_desc: regulator to register
3629 * @cfg: runtime configuration for regulator
3631 * Called by regulator drivers to register a regulator.
3632 * Returns a valid pointer to struct regulator_dev on success
3633 * or an ERR_PTR() on error.
3635 struct regulator_dev *
3636 regulator_register(const struct regulator_desc *regulator_desc,
3637 const struct regulator_config *cfg)
3639 const struct regulation_constraints *constraints = NULL;
3640 const struct regulator_init_data *init_data;
3641 struct regulator_config *config = NULL;
3642 static atomic_t regulator_no = ATOMIC_INIT(-1);
3643 struct regulator_dev *rdev;
3647 if (regulator_desc == NULL || cfg == NULL)
3648 return ERR_PTR(-EINVAL);
3653 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3654 return ERR_PTR(-EINVAL);
3656 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3657 regulator_desc->type != REGULATOR_CURRENT)
3658 return ERR_PTR(-EINVAL);
3660 /* Only one of each should be implemented */
3661 WARN_ON(regulator_desc->ops->get_voltage &&
3662 regulator_desc->ops->get_voltage_sel);
3663 WARN_ON(regulator_desc->ops->set_voltage &&
3664 regulator_desc->ops->set_voltage_sel);
3666 /* If we're using selectors we must implement list_voltage. */
3667 if (regulator_desc->ops->get_voltage_sel &&
3668 !regulator_desc->ops->list_voltage) {
3669 return ERR_PTR(-EINVAL);
3671 if (regulator_desc->ops->set_voltage_sel &&
3672 !regulator_desc->ops->list_voltage) {
3673 return ERR_PTR(-EINVAL);
3676 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3678 return ERR_PTR(-ENOMEM);
3681 * Duplicate the config so the driver could override it after
3682 * parsing init data.
3684 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
3685 if (config == NULL) {
3687 return ERR_PTR(-ENOMEM);
3690 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
3691 &rdev->dev.of_node);
3693 init_data = config->init_data;
3694 rdev->dev.of_node = of_node_get(config->of_node);
3697 mutex_lock(®ulator_list_mutex);
3699 mutex_init(&rdev->mutex);
3700 rdev->reg_data = config->driver_data;
3701 rdev->owner = regulator_desc->owner;
3702 rdev->desc = regulator_desc;
3704 rdev->regmap = config->regmap;
3705 else if (dev_get_regmap(dev, NULL))
3706 rdev->regmap = dev_get_regmap(dev, NULL);
3707 else if (dev->parent)
3708 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3709 INIT_LIST_HEAD(&rdev->consumer_list);
3710 INIT_LIST_HEAD(&rdev->list);
3711 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3712 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3714 /* preform any regulator specific init */
3715 if (init_data && init_data->regulator_init) {
3716 ret = init_data->regulator_init(rdev->reg_data);
3721 /* register with sysfs */
3722 rdev->dev.class = ®ulator_class;
3723 rdev->dev.parent = dev;
3724 dev_set_name(&rdev->dev, "regulator.%lu",
3725 (unsigned long) atomic_inc_return(®ulator_no));
3726 ret = device_register(&rdev->dev);
3728 put_device(&rdev->dev);
3732 dev_set_drvdata(&rdev->dev, rdev);
3734 if ((config->ena_gpio || config->ena_gpio_initialized) &&
3735 gpio_is_valid(config->ena_gpio)) {
3736 ret = regulator_ena_gpio_request(rdev, config);
3738 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3739 config->ena_gpio, ret);
3744 /* set regulator constraints */
3746 constraints = &init_data->constraints;
3748 ret = set_machine_constraints(rdev, constraints);
3752 if (init_data && init_data->supply_regulator)
3753 rdev->supply_name = init_data->supply_regulator;
3754 else if (regulator_desc->supply_name)
3755 rdev->supply_name = regulator_desc->supply_name;
3757 /* add consumers devices */
3759 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3760 ret = set_consumer_device_supply(rdev,
3761 init_data->consumer_supplies[i].dev_name,
3762 init_data->consumer_supplies[i].supply);
3764 dev_err(dev, "Failed to set supply %s\n",
3765 init_data->consumer_supplies[i].supply);
3766 goto unset_supplies;
3771 list_add(&rdev->list, ®ulator_list);
3773 rdev_init_debugfs(rdev);
3775 mutex_unlock(®ulator_list_mutex);
3780 unset_regulator_supplies(rdev);
3783 regulator_ena_gpio_free(rdev);
3784 kfree(rdev->constraints);
3786 device_unregister(&rdev->dev);
3787 /* device core frees rdev */
3788 rdev = ERR_PTR(ret);
3793 rdev = ERR_PTR(ret);
3796 EXPORT_SYMBOL_GPL(regulator_register);
3799 * regulator_unregister - unregister regulator
3800 * @rdev: regulator to unregister
3802 * Called by regulator drivers to unregister a regulator.
3804 void regulator_unregister(struct regulator_dev *rdev)
3810 while (rdev->use_count--)
3811 regulator_disable(rdev->supply);
3812 regulator_put(rdev->supply);
3814 mutex_lock(®ulator_list_mutex);
3815 debugfs_remove_recursive(rdev->debugfs);
3816 flush_work(&rdev->disable_work.work);
3817 WARN_ON(rdev->open_count);
3818 unset_regulator_supplies(rdev);
3819 list_del(&rdev->list);
3820 kfree(rdev->constraints);
3821 regulator_ena_gpio_free(rdev);
3822 of_node_put(rdev->dev.of_node);
3823 device_unregister(&rdev->dev);
3824 mutex_unlock(®ulator_list_mutex);
3826 EXPORT_SYMBOL_GPL(regulator_unregister);
3829 * regulator_suspend_prepare - prepare regulators for system wide suspend
3830 * @state: system suspend state
3832 * Configure each regulator with it's suspend operating parameters for state.
3833 * This will usually be called by machine suspend code prior to supending.
3835 int regulator_suspend_prepare(suspend_state_t state)
3837 struct regulator_dev *rdev;
3840 /* ON is handled by regulator active state */
3841 if (state == PM_SUSPEND_ON)
3844 mutex_lock(®ulator_list_mutex);
3845 list_for_each_entry(rdev, ®ulator_list, list) {
3847 mutex_lock(&rdev->mutex);
3848 ret = suspend_prepare(rdev, state);
3849 mutex_unlock(&rdev->mutex);
3852 rdev_err(rdev, "failed to prepare\n");
3857 mutex_unlock(®ulator_list_mutex);
3860 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3863 * regulator_suspend_finish - resume regulators from system wide suspend
3865 * Turn on regulators that might be turned off by regulator_suspend_prepare
3866 * and that should be turned on according to the regulators properties.
3868 int regulator_suspend_finish(void)
3870 struct regulator_dev *rdev;
3873 mutex_lock(®ulator_list_mutex);
3874 list_for_each_entry(rdev, ®ulator_list, list) {
3875 mutex_lock(&rdev->mutex);
3876 if (rdev->use_count > 0 || rdev->constraints->always_on) {
3877 if (!_regulator_is_enabled(rdev)) {
3878 error = _regulator_do_enable(rdev);
3883 if (!have_full_constraints())
3885 if (!_regulator_is_enabled(rdev))
3888 error = _regulator_do_disable(rdev);
3893 mutex_unlock(&rdev->mutex);
3895 mutex_unlock(®ulator_list_mutex);
3898 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3901 * regulator_has_full_constraints - the system has fully specified constraints
3903 * Calling this function will cause the regulator API to disable all
3904 * regulators which have a zero use count and don't have an always_on
3905 * constraint in a late_initcall.
3907 * The intention is that this will become the default behaviour in a
3908 * future kernel release so users are encouraged to use this facility
3911 void regulator_has_full_constraints(void)
3913 has_full_constraints = 1;
3915 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3918 * rdev_get_drvdata - get rdev regulator driver data
3921 * Get rdev regulator driver private data. This call can be used in the
3922 * regulator driver context.
3924 void *rdev_get_drvdata(struct regulator_dev *rdev)
3926 return rdev->reg_data;
3928 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3931 * regulator_get_drvdata - get regulator driver data
3932 * @regulator: regulator
3934 * Get regulator driver private data. This call can be used in the consumer
3935 * driver context when non API regulator specific functions need to be called.
3937 void *regulator_get_drvdata(struct regulator *regulator)
3939 return regulator->rdev->reg_data;
3941 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3944 * regulator_set_drvdata - set regulator driver data
3945 * @regulator: regulator
3948 void regulator_set_drvdata(struct regulator *regulator, void *data)
3950 regulator->rdev->reg_data = data;
3952 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3955 * regulator_get_id - get regulator ID
3958 int rdev_get_id(struct regulator_dev *rdev)
3960 return rdev->desc->id;
3962 EXPORT_SYMBOL_GPL(rdev_get_id);
3964 struct device *rdev_get_dev(struct regulator_dev *rdev)
3968 EXPORT_SYMBOL_GPL(rdev_get_dev);
3970 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3972 return reg_init_data->driver_data;
3974 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3976 #ifdef CONFIG_DEBUG_FS
3977 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3978 size_t count, loff_t *ppos)
3980 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3981 ssize_t len, ret = 0;
3982 struct regulator_map *map;
3987 list_for_each_entry(map, ®ulator_map_list, list) {
3988 len = snprintf(buf + ret, PAGE_SIZE - ret,
3990 rdev_get_name(map->regulator), map->dev_name,
3994 if (ret > PAGE_SIZE) {
4000 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
4008 static const struct file_operations supply_map_fops = {
4009 #ifdef CONFIG_DEBUG_FS
4010 .read = supply_map_read_file,
4011 .llseek = default_llseek,
4015 #ifdef CONFIG_DEBUG_FS
4016 static void regulator_summary_show_subtree(struct seq_file *s,
4017 struct regulator_dev *rdev,
4020 struct list_head *list = s->private;
4021 struct regulator_dev *child;
4022 struct regulation_constraints *c;
4023 struct regulator *consumer;
4028 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4030 30 - level * 3, rdev_get_name(rdev),
4031 rdev->use_count, rdev->open_count, rdev->bypass_count);
4033 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4034 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
4036 c = rdev->constraints;
4038 switch (rdev->desc->type) {
4039 case REGULATOR_VOLTAGE:
4040 seq_printf(s, "%5dmV %5dmV ",
4041 c->min_uV / 1000, c->max_uV / 1000);
4043 case REGULATOR_CURRENT:
4044 seq_printf(s, "%5dmA %5dmA ",
4045 c->min_uA / 1000, c->max_uA / 1000);
4052 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4053 if (consumer->dev->class == ®ulator_class)
4056 seq_printf(s, "%*s%-*s ",
4057 (level + 1) * 3 + 1, "",
4058 30 - (level + 1) * 3, dev_name(consumer->dev));
4060 switch (rdev->desc->type) {
4061 case REGULATOR_VOLTAGE:
4062 seq_printf(s, "%37dmV %5dmV",
4063 consumer->min_uV / 1000,
4064 consumer->max_uV / 1000);
4066 case REGULATOR_CURRENT:
4073 list_for_each_entry(child, list, list) {
4074 /* handle only non-root regulators supplied by current rdev */
4075 if (!child->supply || child->supply->rdev != rdev)
4078 regulator_summary_show_subtree(s, child, level + 1);
4082 static int regulator_summary_show(struct seq_file *s, void *data)
4084 struct list_head *list = s->private;
4085 struct regulator_dev *rdev;
4087 seq_puts(s, " regulator use open bypass voltage current min max\n");
4088 seq_puts(s, "-------------------------------------------------------------------------------\n");
4090 mutex_lock(®ulator_list_mutex);
4092 list_for_each_entry(rdev, list, list) {
4096 regulator_summary_show_subtree(s, rdev, 0);
4099 mutex_unlock(®ulator_list_mutex);
4104 static int regulator_summary_open(struct inode *inode, struct file *file)
4106 return single_open(file, regulator_summary_show, inode->i_private);
4110 static const struct file_operations regulator_summary_fops = {
4111 #ifdef CONFIG_DEBUG_FS
4112 .open = regulator_summary_open,
4114 .llseek = seq_lseek,
4115 .release = single_release,
4119 static int __init regulator_init(void)
4123 ret = class_register(®ulator_class);
4125 debugfs_root = debugfs_create_dir("regulator", NULL);
4127 pr_warn("regulator: Failed to create debugfs directory\n");
4129 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4132 debugfs_create_file("regulator_summary", 0444, debugfs_root,
4133 ®ulator_list, ®ulator_summary_fops);
4135 regulator_dummy_init();
4140 /* init early to allow our consumers to complete system booting */
4141 core_initcall(regulator_init);
4143 static int __init regulator_init_complete(void)
4145 struct regulator_dev *rdev;
4146 const struct regulator_ops *ops;
4147 struct regulation_constraints *c;
4151 * Since DT doesn't provide an idiomatic mechanism for
4152 * enabling full constraints and since it's much more natural
4153 * with DT to provide them just assume that a DT enabled
4154 * system has full constraints.
4156 if (of_have_populated_dt())
4157 has_full_constraints = true;
4159 mutex_lock(®ulator_list_mutex);
4161 /* If we have a full configuration then disable any regulators
4162 * we have permission to change the status for and which are
4163 * not in use or always_on. This is effectively the default
4164 * for DT and ACPI as they have full constraints.
4166 list_for_each_entry(rdev, ®ulator_list, list) {
4167 ops = rdev->desc->ops;
4168 c = rdev->constraints;
4170 if (c && c->always_on)
4173 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
4176 mutex_lock(&rdev->mutex);
4178 if (rdev->use_count)
4181 /* If we can't read the status assume it's on. */
4182 if (ops->is_enabled)
4183 enabled = ops->is_enabled(rdev);
4190 if (have_full_constraints()) {
4191 /* We log since this may kill the system if it
4193 rdev_info(rdev, "disabling\n");
4194 ret = _regulator_do_disable(rdev);
4196 rdev_err(rdev, "couldn't disable: %d\n", ret);
4198 /* The intention is that in future we will
4199 * assume that full constraints are provided
4200 * so warn even if we aren't going to do
4203 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4207 mutex_unlock(&rdev->mutex);
4210 mutex_unlock(®ulator_list_mutex);
4214 late_initcall_sync(regulator_init_complete);