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>
27 #include <linux/regmap.h>
28 #include <linux/regulator/of_regulator.h>
29 #include <linux/regulator/consumer.h>
30 #include <linux/regulator/driver.h>
31 #include <linux/regulator/machine.h>
32 #include <linux/module.h>
34 #define CREATE_TRACE_POINTS
35 #include <trace/events/regulator.h>
39 #define rdev_crit(rdev, fmt, ...) \
40 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
41 #define rdev_err(rdev, fmt, ...) \
42 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
43 #define rdev_warn(rdev, fmt, ...) \
44 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
45 #define rdev_info(rdev, fmt, ...) \
46 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
47 #define rdev_dbg(rdev, fmt, ...) \
48 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 static DEFINE_MUTEX(regulator_list_mutex);
51 static LIST_HEAD(regulator_list);
52 static LIST_HEAD(regulator_map_list);
53 static bool has_full_constraints;
54 static bool board_wants_dummy_regulator;
56 static struct dentry *debugfs_root;
59 * struct regulator_map
61 * Used to provide symbolic supply names to devices.
63 struct regulator_map {
64 struct list_head list;
65 const char *dev_name; /* The dev_name() for the consumer */
67 struct regulator_dev *regulator;
73 * One for each consumer device.
77 struct list_head list;
78 unsigned int always_on:1;
83 struct device_attribute dev_attr;
84 struct regulator_dev *rdev;
85 struct dentry *debugfs;
88 static int _regulator_is_enabled(struct regulator_dev *rdev);
89 static int _regulator_disable(struct regulator_dev *rdev);
90 static int _regulator_get_voltage(struct regulator_dev *rdev);
91 static int _regulator_get_current_limit(struct regulator_dev *rdev);
92 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
93 static void _notifier_call_chain(struct regulator_dev *rdev,
94 unsigned long event, void *data);
95 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
96 int min_uV, int max_uV);
97 static struct regulator *create_regulator(struct regulator_dev *rdev,
99 const char *supply_name);
101 static const char *rdev_get_name(struct regulator_dev *rdev)
103 if (rdev->constraints && rdev->constraints->name)
104 return rdev->constraints->name;
105 else if (rdev->desc->name)
106 return rdev->desc->name;
111 /* gets the regulator for a given consumer device */
112 static struct regulator *get_device_regulator(struct device *dev)
114 struct regulator *regulator = NULL;
115 struct regulator_dev *rdev;
117 mutex_lock(®ulator_list_mutex);
118 list_for_each_entry(rdev, ®ulator_list, list) {
119 mutex_lock(&rdev->mutex);
120 list_for_each_entry(regulator, &rdev->consumer_list, list) {
121 if (regulator->dev == dev) {
122 mutex_unlock(&rdev->mutex);
123 mutex_unlock(®ulator_list_mutex);
127 mutex_unlock(&rdev->mutex);
129 mutex_unlock(®ulator_list_mutex);
134 * of_get_regulator - get a regulator device node based on supply name
135 * @dev: Device pointer for the consumer (of regulator) device
136 * @supply: regulator supply name
138 * Extract the regulator device node corresponding to the supply name.
139 * retruns the device node corresponding to the regulator if found, else
142 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
144 struct device_node *regnode = NULL;
145 char prop_name[32]; /* 32 is max size of property name */
147 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
149 snprintf(prop_name, 32, "%s-supply", supply);
150 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
153 dev_dbg(dev, "Looking up %s property in node %s failed",
154 prop_name, dev->of_node->full_name);
160 static int _regulator_can_change_status(struct regulator_dev *rdev)
162 if (!rdev->constraints)
165 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
171 /* Platform voltage constraint check */
172 static int regulator_check_voltage(struct regulator_dev *rdev,
173 int *min_uV, int *max_uV)
175 BUG_ON(*min_uV > *max_uV);
177 if (!rdev->constraints) {
178 rdev_err(rdev, "no constraints\n");
181 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
182 rdev_err(rdev, "operation not allowed\n");
186 if (*max_uV > rdev->constraints->max_uV)
187 *max_uV = rdev->constraints->max_uV;
188 if (*min_uV < rdev->constraints->min_uV)
189 *min_uV = rdev->constraints->min_uV;
191 if (*min_uV > *max_uV) {
192 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
200 /* Make sure we select a voltage that suits the needs of all
201 * regulator consumers
203 static int regulator_check_consumers(struct regulator_dev *rdev,
204 int *min_uV, int *max_uV)
206 struct regulator *regulator;
208 list_for_each_entry(regulator, &rdev->consumer_list, list) {
210 * Assume consumers that didn't say anything are OK
211 * with anything in the constraint range.
213 if (!regulator->min_uV && !regulator->max_uV)
216 if (*max_uV > regulator->max_uV)
217 *max_uV = regulator->max_uV;
218 if (*min_uV < regulator->min_uV)
219 *min_uV = regulator->min_uV;
222 if (*min_uV > *max_uV)
228 /* current constraint check */
229 static int regulator_check_current_limit(struct regulator_dev *rdev,
230 int *min_uA, int *max_uA)
232 BUG_ON(*min_uA > *max_uA);
234 if (!rdev->constraints) {
235 rdev_err(rdev, "no constraints\n");
238 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
239 rdev_err(rdev, "operation not allowed\n");
243 if (*max_uA > rdev->constraints->max_uA)
244 *max_uA = rdev->constraints->max_uA;
245 if (*min_uA < rdev->constraints->min_uA)
246 *min_uA = rdev->constraints->min_uA;
248 if (*min_uA > *max_uA) {
249 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
257 /* operating mode constraint check */
258 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
261 case REGULATOR_MODE_FAST:
262 case REGULATOR_MODE_NORMAL:
263 case REGULATOR_MODE_IDLE:
264 case REGULATOR_MODE_STANDBY:
267 rdev_err(rdev, "invalid mode %x specified\n", *mode);
271 if (!rdev->constraints) {
272 rdev_err(rdev, "no constraints\n");
275 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
276 rdev_err(rdev, "operation not allowed\n");
280 /* The modes are bitmasks, the most power hungry modes having
281 * the lowest values. If the requested mode isn't supported
282 * try higher modes. */
284 if (rdev->constraints->valid_modes_mask & *mode)
292 /* dynamic regulator mode switching constraint check */
293 static int regulator_check_drms(struct regulator_dev *rdev)
295 if (!rdev->constraints) {
296 rdev_err(rdev, "no constraints\n");
299 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
300 rdev_err(rdev, "operation not allowed\n");
306 static ssize_t device_requested_uA_show(struct device *dev,
307 struct device_attribute *attr, char *buf)
309 struct regulator *regulator;
311 regulator = get_device_regulator(dev);
312 if (regulator == NULL)
315 return sprintf(buf, "%d\n", regulator->uA_load);
318 static ssize_t regulator_uV_show(struct device *dev,
319 struct device_attribute *attr, char *buf)
321 struct regulator_dev *rdev = dev_get_drvdata(dev);
324 mutex_lock(&rdev->mutex);
325 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
326 mutex_unlock(&rdev->mutex);
330 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
332 static ssize_t regulator_uA_show(struct device *dev,
333 struct device_attribute *attr, char *buf)
335 struct regulator_dev *rdev = dev_get_drvdata(dev);
337 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
339 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
341 static ssize_t regulator_name_show(struct device *dev,
342 struct device_attribute *attr, char *buf)
344 struct regulator_dev *rdev = dev_get_drvdata(dev);
346 return sprintf(buf, "%s\n", rdev_get_name(rdev));
349 static ssize_t regulator_print_opmode(char *buf, int mode)
352 case REGULATOR_MODE_FAST:
353 return sprintf(buf, "fast\n");
354 case REGULATOR_MODE_NORMAL:
355 return sprintf(buf, "normal\n");
356 case REGULATOR_MODE_IDLE:
357 return sprintf(buf, "idle\n");
358 case REGULATOR_MODE_STANDBY:
359 return sprintf(buf, "standby\n");
361 return sprintf(buf, "unknown\n");
364 static ssize_t regulator_opmode_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
367 struct regulator_dev *rdev = dev_get_drvdata(dev);
369 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
371 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
373 static ssize_t regulator_print_state(char *buf, int state)
376 return sprintf(buf, "enabled\n");
378 return sprintf(buf, "disabled\n");
380 return sprintf(buf, "unknown\n");
383 static ssize_t regulator_state_show(struct device *dev,
384 struct device_attribute *attr, char *buf)
386 struct regulator_dev *rdev = dev_get_drvdata(dev);
389 mutex_lock(&rdev->mutex);
390 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
391 mutex_unlock(&rdev->mutex);
395 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
397 static ssize_t regulator_status_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
400 struct regulator_dev *rdev = dev_get_drvdata(dev);
404 status = rdev->desc->ops->get_status(rdev);
409 case REGULATOR_STATUS_OFF:
412 case REGULATOR_STATUS_ON:
415 case REGULATOR_STATUS_ERROR:
418 case REGULATOR_STATUS_FAST:
421 case REGULATOR_STATUS_NORMAL:
424 case REGULATOR_STATUS_IDLE:
427 case REGULATOR_STATUS_STANDBY:
434 return sprintf(buf, "%s\n", label);
436 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
438 static ssize_t regulator_min_uA_show(struct device *dev,
439 struct device_attribute *attr, char *buf)
441 struct regulator_dev *rdev = dev_get_drvdata(dev);
443 if (!rdev->constraints)
444 return sprintf(buf, "constraint not defined\n");
446 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
448 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
450 static ssize_t regulator_max_uA_show(struct device *dev,
451 struct device_attribute *attr, char *buf)
453 struct regulator_dev *rdev = dev_get_drvdata(dev);
455 if (!rdev->constraints)
456 return sprintf(buf, "constraint not defined\n");
458 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
460 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
462 static ssize_t regulator_min_uV_show(struct device *dev,
463 struct device_attribute *attr, char *buf)
465 struct regulator_dev *rdev = dev_get_drvdata(dev);
467 if (!rdev->constraints)
468 return sprintf(buf, "constraint not defined\n");
470 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
472 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
474 static ssize_t regulator_max_uV_show(struct device *dev,
475 struct device_attribute *attr, char *buf)
477 struct regulator_dev *rdev = dev_get_drvdata(dev);
479 if (!rdev->constraints)
480 return sprintf(buf, "constraint not defined\n");
482 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
484 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
486 static ssize_t regulator_total_uA_show(struct device *dev,
487 struct device_attribute *attr, char *buf)
489 struct regulator_dev *rdev = dev_get_drvdata(dev);
490 struct regulator *regulator;
493 mutex_lock(&rdev->mutex);
494 list_for_each_entry(regulator, &rdev->consumer_list, list)
495 uA += regulator->uA_load;
496 mutex_unlock(&rdev->mutex);
497 return sprintf(buf, "%d\n", uA);
499 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
501 static ssize_t regulator_num_users_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
504 struct regulator_dev *rdev = dev_get_drvdata(dev);
505 return sprintf(buf, "%d\n", rdev->use_count);
508 static ssize_t regulator_type_show(struct device *dev,
509 struct device_attribute *attr, char *buf)
511 struct regulator_dev *rdev = dev_get_drvdata(dev);
513 switch (rdev->desc->type) {
514 case REGULATOR_VOLTAGE:
515 return sprintf(buf, "voltage\n");
516 case REGULATOR_CURRENT:
517 return sprintf(buf, "current\n");
519 return sprintf(buf, "unknown\n");
522 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
523 struct device_attribute *attr, char *buf)
525 struct regulator_dev *rdev = dev_get_drvdata(dev);
527 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
529 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
530 regulator_suspend_mem_uV_show, NULL);
532 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
533 struct device_attribute *attr, char *buf)
535 struct regulator_dev *rdev = dev_get_drvdata(dev);
537 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
539 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
540 regulator_suspend_disk_uV_show, NULL);
542 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
543 struct device_attribute *attr, char *buf)
545 struct regulator_dev *rdev = dev_get_drvdata(dev);
547 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
549 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
550 regulator_suspend_standby_uV_show, NULL);
552 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
553 struct device_attribute *attr, char *buf)
555 struct regulator_dev *rdev = dev_get_drvdata(dev);
557 return regulator_print_opmode(buf,
558 rdev->constraints->state_mem.mode);
560 static DEVICE_ATTR(suspend_mem_mode, 0444,
561 regulator_suspend_mem_mode_show, NULL);
563 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
564 struct device_attribute *attr, char *buf)
566 struct regulator_dev *rdev = dev_get_drvdata(dev);
568 return regulator_print_opmode(buf,
569 rdev->constraints->state_disk.mode);
571 static DEVICE_ATTR(suspend_disk_mode, 0444,
572 regulator_suspend_disk_mode_show, NULL);
574 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
575 struct device_attribute *attr, char *buf)
577 struct regulator_dev *rdev = dev_get_drvdata(dev);
579 return regulator_print_opmode(buf,
580 rdev->constraints->state_standby.mode);
582 static DEVICE_ATTR(suspend_standby_mode, 0444,
583 regulator_suspend_standby_mode_show, NULL);
585 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
588 struct regulator_dev *rdev = dev_get_drvdata(dev);
590 return regulator_print_state(buf,
591 rdev->constraints->state_mem.enabled);
593 static DEVICE_ATTR(suspend_mem_state, 0444,
594 regulator_suspend_mem_state_show, NULL);
596 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
597 struct device_attribute *attr, char *buf)
599 struct regulator_dev *rdev = dev_get_drvdata(dev);
601 return regulator_print_state(buf,
602 rdev->constraints->state_disk.enabled);
604 static DEVICE_ATTR(suspend_disk_state, 0444,
605 regulator_suspend_disk_state_show, NULL);
607 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
608 struct device_attribute *attr, char *buf)
610 struct regulator_dev *rdev = dev_get_drvdata(dev);
612 return regulator_print_state(buf,
613 rdev->constraints->state_standby.enabled);
615 static DEVICE_ATTR(suspend_standby_state, 0444,
616 regulator_suspend_standby_state_show, NULL);
620 * These are the only attributes are present for all regulators.
621 * Other attributes are a function of regulator functionality.
623 static struct device_attribute regulator_dev_attrs[] = {
624 __ATTR(name, 0444, regulator_name_show, NULL),
625 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
626 __ATTR(type, 0444, regulator_type_show, NULL),
630 static void regulator_dev_release(struct device *dev)
632 struct regulator_dev *rdev = dev_get_drvdata(dev);
636 static struct class regulator_class = {
638 .dev_release = regulator_dev_release,
639 .dev_attrs = regulator_dev_attrs,
642 /* Calculate the new optimum regulator operating mode based on the new total
643 * consumer load. All locks held by caller */
644 static void drms_uA_update(struct regulator_dev *rdev)
646 struct regulator *sibling;
647 int current_uA = 0, output_uV, input_uV, err;
650 err = regulator_check_drms(rdev);
651 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
652 (!rdev->desc->ops->get_voltage &&
653 !rdev->desc->ops->get_voltage_sel) ||
654 !rdev->desc->ops->set_mode)
657 /* get output voltage */
658 output_uV = _regulator_get_voltage(rdev);
662 /* get input voltage */
665 input_uV = regulator_get_voltage(rdev->supply);
667 input_uV = rdev->constraints->input_uV;
671 /* calc total requested load */
672 list_for_each_entry(sibling, &rdev->consumer_list, list)
673 current_uA += sibling->uA_load;
675 /* now get the optimum mode for our new total regulator load */
676 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
677 output_uV, current_uA);
679 /* check the new mode is allowed */
680 err = regulator_mode_constrain(rdev, &mode);
682 rdev->desc->ops->set_mode(rdev, mode);
685 static int suspend_set_state(struct regulator_dev *rdev,
686 struct regulator_state *rstate)
690 /* If we have no suspend mode configration don't set anything;
691 * only warn if the driver implements set_suspend_voltage or
692 * set_suspend_mode callback.
694 if (!rstate->enabled && !rstate->disabled) {
695 if (rdev->desc->ops->set_suspend_voltage ||
696 rdev->desc->ops->set_suspend_mode)
697 rdev_warn(rdev, "No configuration\n");
701 if (rstate->enabled && rstate->disabled) {
702 rdev_err(rdev, "invalid configuration\n");
706 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
707 ret = rdev->desc->ops->set_suspend_enable(rdev);
708 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
709 ret = rdev->desc->ops->set_suspend_disable(rdev);
710 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
714 rdev_err(rdev, "failed to enabled/disable\n");
718 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
719 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
721 rdev_err(rdev, "failed to set voltage\n");
726 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
727 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
729 rdev_err(rdev, "failed to set mode\n");
736 /* locks held by caller */
737 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
739 if (!rdev->constraints)
743 case PM_SUSPEND_STANDBY:
744 return suspend_set_state(rdev,
745 &rdev->constraints->state_standby);
747 return suspend_set_state(rdev,
748 &rdev->constraints->state_mem);
750 return suspend_set_state(rdev,
751 &rdev->constraints->state_disk);
757 static void print_constraints(struct regulator_dev *rdev)
759 struct regulation_constraints *constraints = rdev->constraints;
764 if (constraints->min_uV && constraints->max_uV) {
765 if (constraints->min_uV == constraints->max_uV)
766 count += sprintf(buf + count, "%d mV ",
767 constraints->min_uV / 1000);
769 count += sprintf(buf + count, "%d <--> %d mV ",
770 constraints->min_uV / 1000,
771 constraints->max_uV / 1000);
774 if (!constraints->min_uV ||
775 constraints->min_uV != constraints->max_uV) {
776 ret = _regulator_get_voltage(rdev);
778 count += sprintf(buf + count, "at %d mV ", ret / 1000);
781 if (constraints->uV_offset)
782 count += sprintf(buf, "%dmV offset ",
783 constraints->uV_offset / 1000);
785 if (constraints->min_uA && constraints->max_uA) {
786 if (constraints->min_uA == constraints->max_uA)
787 count += sprintf(buf + count, "%d mA ",
788 constraints->min_uA / 1000);
790 count += sprintf(buf + count, "%d <--> %d mA ",
791 constraints->min_uA / 1000,
792 constraints->max_uA / 1000);
795 if (!constraints->min_uA ||
796 constraints->min_uA != constraints->max_uA) {
797 ret = _regulator_get_current_limit(rdev);
799 count += sprintf(buf + count, "at %d mA ", ret / 1000);
802 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
803 count += sprintf(buf + count, "fast ");
804 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
805 count += sprintf(buf + count, "normal ");
806 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
807 count += sprintf(buf + count, "idle ");
808 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
809 count += sprintf(buf + count, "standby");
811 rdev_info(rdev, "%s\n", buf);
813 if ((constraints->min_uV != constraints->max_uV) &&
814 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
816 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
819 static int machine_constraints_voltage(struct regulator_dev *rdev,
820 struct regulation_constraints *constraints)
822 struct regulator_ops *ops = rdev->desc->ops;
825 /* do we need to apply the constraint voltage */
826 if (rdev->constraints->apply_uV &&
827 rdev->constraints->min_uV == rdev->constraints->max_uV) {
828 ret = _regulator_do_set_voltage(rdev,
829 rdev->constraints->min_uV,
830 rdev->constraints->max_uV);
832 rdev_err(rdev, "failed to apply %duV constraint\n",
833 rdev->constraints->min_uV);
838 /* constrain machine-level voltage specs to fit
839 * the actual range supported by this regulator.
841 if (ops->list_voltage && rdev->desc->n_voltages) {
842 int count = rdev->desc->n_voltages;
844 int min_uV = INT_MAX;
845 int max_uV = INT_MIN;
846 int cmin = constraints->min_uV;
847 int cmax = constraints->max_uV;
849 /* it's safe to autoconfigure fixed-voltage supplies
850 and the constraints are used by list_voltage. */
851 if (count == 1 && !cmin) {
854 constraints->min_uV = cmin;
855 constraints->max_uV = cmax;
858 /* voltage constraints are optional */
859 if ((cmin == 0) && (cmax == 0))
862 /* else require explicit machine-level constraints */
863 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
864 rdev_err(rdev, "invalid voltage constraints\n");
868 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
869 for (i = 0; i < count; i++) {
872 value = ops->list_voltage(rdev, i);
876 /* maybe adjust [min_uV..max_uV] */
877 if (value >= cmin && value < min_uV)
879 if (value <= cmax && value > max_uV)
883 /* final: [min_uV..max_uV] valid iff constraints valid */
884 if (max_uV < min_uV) {
885 rdev_err(rdev, "unsupportable voltage constraints\n");
889 /* use regulator's subset of machine constraints */
890 if (constraints->min_uV < min_uV) {
891 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
892 constraints->min_uV, min_uV);
893 constraints->min_uV = min_uV;
895 if (constraints->max_uV > max_uV) {
896 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
897 constraints->max_uV, max_uV);
898 constraints->max_uV = max_uV;
906 * set_machine_constraints - sets regulator constraints
907 * @rdev: regulator source
908 * @constraints: constraints to apply
910 * Allows platform initialisation code to define and constrain
911 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
912 * Constraints *must* be set by platform code in order for some
913 * regulator operations to proceed i.e. set_voltage, set_current_limit,
916 static int set_machine_constraints(struct regulator_dev *rdev,
917 const struct regulation_constraints *constraints)
920 struct regulator_ops *ops = rdev->desc->ops;
923 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
926 rdev->constraints = kzalloc(sizeof(*constraints),
928 if (!rdev->constraints)
931 ret = machine_constraints_voltage(rdev, rdev->constraints);
935 /* do we need to setup our suspend state */
936 if (rdev->constraints->initial_state) {
937 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
939 rdev_err(rdev, "failed to set suspend state\n");
944 if (rdev->constraints->initial_mode) {
945 if (!ops->set_mode) {
946 rdev_err(rdev, "no set_mode operation\n");
951 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
953 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
958 /* If the constraints say the regulator should be on at this point
959 * and we have control then make sure it is enabled.
961 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
963 ret = ops->enable(rdev);
965 rdev_err(rdev, "failed to enable\n");
970 print_constraints(rdev);
973 kfree(rdev->constraints);
974 rdev->constraints = NULL;
979 * set_supply - set regulator supply regulator
980 * @rdev: regulator name
981 * @supply_rdev: supply regulator name
983 * Called by platform initialisation code to set the supply regulator for this
984 * regulator. This ensures that a regulators supply will also be enabled by the
985 * core if it's child is enabled.
987 static int set_supply(struct regulator_dev *rdev,
988 struct regulator_dev *supply_rdev)
992 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
994 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
995 if (rdev->supply == NULL) {
1004 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1005 * @rdev: regulator source
1006 * @consumer_dev_name: dev_name() string for device supply applies to
1007 * @supply: symbolic name for supply
1009 * Allows platform initialisation code to map physical regulator
1010 * sources to symbolic names for supplies for use by devices. Devices
1011 * should use these symbolic names to request regulators, avoiding the
1012 * need to provide board-specific regulator names as platform data.
1014 static int set_consumer_device_supply(struct regulator_dev *rdev,
1015 const char *consumer_dev_name,
1018 struct regulator_map *node;
1024 if (consumer_dev_name != NULL)
1029 list_for_each_entry(node, ®ulator_map_list, list) {
1030 if (node->dev_name && consumer_dev_name) {
1031 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1033 } else if (node->dev_name || consumer_dev_name) {
1037 if (strcmp(node->supply, supply) != 0)
1040 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1042 dev_name(&node->regulator->dev),
1043 node->regulator->desc->name,
1045 dev_name(&rdev->dev), rdev_get_name(rdev));
1049 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1053 node->regulator = rdev;
1054 node->supply = supply;
1057 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1058 if (node->dev_name == NULL) {
1064 list_add(&node->list, ®ulator_map_list);
1068 static void unset_regulator_supplies(struct regulator_dev *rdev)
1070 struct regulator_map *node, *n;
1072 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1073 if (rdev == node->regulator) {
1074 list_del(&node->list);
1075 kfree(node->dev_name);
1081 #define REG_STR_SIZE 64
1083 static struct regulator *create_regulator(struct regulator_dev *rdev,
1085 const char *supply_name)
1087 struct regulator *regulator;
1088 char buf[REG_STR_SIZE];
1091 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1092 if (regulator == NULL)
1095 mutex_lock(&rdev->mutex);
1096 regulator->rdev = rdev;
1097 list_add(®ulator->list, &rdev->consumer_list);
1100 /* create a 'requested_microamps_name' sysfs entry */
1101 size = scnprintf(buf, REG_STR_SIZE,
1102 "microamps_requested_%s-%s",
1103 dev_name(dev), supply_name);
1104 if (size >= REG_STR_SIZE)
1107 regulator->dev = dev;
1108 sysfs_attr_init(®ulator->dev_attr.attr);
1109 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1110 if (regulator->dev_attr.attr.name == NULL)
1113 regulator->dev_attr.attr.mode = 0444;
1114 regulator->dev_attr.show = device_requested_uA_show;
1115 err = device_create_file(dev, ®ulator->dev_attr);
1117 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
1121 /* also add a link to the device sysfs entry */
1122 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1123 dev->kobj.name, supply_name);
1124 if (size >= REG_STR_SIZE)
1127 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1128 if (regulator->supply_name == NULL)
1131 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1134 rdev_warn(rdev, "could not add device link %s err %d\n",
1135 dev->kobj.name, err);
1139 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1140 if (regulator->supply_name == NULL)
1144 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1146 if (!regulator->debugfs) {
1147 rdev_warn(rdev, "Failed to create debugfs directory\n");
1149 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1150 ®ulator->uA_load);
1151 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1152 ®ulator->min_uV);
1153 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1154 ®ulator->max_uV);
1158 * Check now if the regulator is an always on regulator - if
1159 * it is then we don't need to do nearly so much work for
1160 * enable/disable calls.
1162 if (!_regulator_can_change_status(rdev) &&
1163 _regulator_is_enabled(rdev))
1164 regulator->always_on = true;
1166 mutex_unlock(&rdev->mutex);
1169 kfree(regulator->supply_name);
1171 device_remove_file(regulator->dev, ®ulator->dev_attr);
1173 kfree(regulator->dev_attr.attr.name);
1175 list_del(®ulator->list);
1177 mutex_unlock(&rdev->mutex);
1181 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1183 if (!rdev->desc->ops->enable_time)
1185 return rdev->desc->ops->enable_time(rdev);
1188 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1192 struct regulator_dev *r;
1193 struct device_node *node;
1194 struct regulator_map *map;
1195 const char *devname = NULL;
1197 /* first do a dt based lookup */
1198 if (dev && dev->of_node) {
1199 node = of_get_regulator(dev, supply);
1201 list_for_each_entry(r, ®ulator_list, list)
1202 if (r->dev.parent &&
1203 node == r->dev.of_node)
1207 * If we couldn't even get the node then it's
1208 * not just that the device didn't register
1209 * yet, there's no node and we'll never
1216 /* if not found, try doing it non-dt way */
1218 devname = dev_name(dev);
1220 list_for_each_entry(r, ®ulator_list, list)
1221 if (strcmp(rdev_get_name(r), supply) == 0)
1224 list_for_each_entry(map, ®ulator_map_list, list) {
1225 /* If the mapping has a device set up it must match */
1226 if (map->dev_name &&
1227 (!devname || strcmp(map->dev_name, devname)))
1230 if (strcmp(map->supply, supply) == 0)
1231 return map->regulator;
1238 /* Internal regulator request function */
1239 static struct regulator *_regulator_get(struct device *dev, const char *id,
1242 struct regulator_dev *rdev;
1243 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1244 const char *devname = NULL;
1248 pr_err("get() with no identifier\n");
1253 devname = dev_name(dev);
1255 mutex_lock(®ulator_list_mutex);
1257 rdev = regulator_dev_lookup(dev, id, &ret);
1261 if (board_wants_dummy_regulator) {
1262 rdev = dummy_regulator_rdev;
1266 #ifdef CONFIG_REGULATOR_DUMMY
1268 devname = "deviceless";
1270 /* If the board didn't flag that it was fully constrained then
1271 * substitute in a dummy regulator so consumers can continue.
1273 if (!has_full_constraints) {
1274 pr_warn("%s supply %s not found, using dummy regulator\n",
1276 rdev = dummy_regulator_rdev;
1281 mutex_unlock(®ulator_list_mutex);
1285 if (rdev->exclusive) {
1286 regulator = ERR_PTR(-EPERM);
1290 if (exclusive && rdev->open_count) {
1291 regulator = ERR_PTR(-EBUSY);
1295 if (!try_module_get(rdev->owner))
1298 regulator = create_regulator(rdev, dev, id);
1299 if (regulator == NULL) {
1300 regulator = ERR_PTR(-ENOMEM);
1301 module_put(rdev->owner);
1307 rdev->exclusive = 1;
1309 ret = _regulator_is_enabled(rdev);
1311 rdev->use_count = 1;
1313 rdev->use_count = 0;
1317 mutex_unlock(®ulator_list_mutex);
1323 * regulator_get - lookup and obtain a reference to a regulator.
1324 * @dev: device for regulator "consumer"
1325 * @id: Supply name or regulator ID.
1327 * Returns a struct regulator corresponding to the regulator producer,
1328 * or IS_ERR() condition containing errno.
1330 * Use of supply names configured via regulator_set_device_supply() is
1331 * strongly encouraged. It is recommended that the supply name used
1332 * should match the name used for the supply and/or the relevant
1333 * device pins in the datasheet.
1335 struct regulator *regulator_get(struct device *dev, const char *id)
1337 return _regulator_get(dev, id, 0);
1339 EXPORT_SYMBOL_GPL(regulator_get);
1341 static void devm_regulator_release(struct device *dev, void *res)
1343 regulator_put(*(struct regulator **)res);
1347 * devm_regulator_get - Resource managed regulator_get()
1348 * @dev: device for regulator "consumer"
1349 * @id: Supply name or regulator ID.
1351 * Managed regulator_get(). Regulators returned from this function are
1352 * automatically regulator_put() on driver detach. See regulator_get() for more
1355 struct regulator *devm_regulator_get(struct device *dev, const char *id)
1357 struct regulator **ptr, *regulator;
1359 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1361 return ERR_PTR(-ENOMEM);
1363 regulator = regulator_get(dev, id);
1364 if (!IS_ERR(regulator)) {
1366 devres_add(dev, ptr);
1373 EXPORT_SYMBOL_GPL(devm_regulator_get);
1376 * regulator_get_exclusive - obtain exclusive access to a regulator.
1377 * @dev: device for regulator "consumer"
1378 * @id: Supply name or regulator ID.
1380 * Returns a struct regulator corresponding to the regulator producer,
1381 * or IS_ERR() condition containing errno. Other consumers will be
1382 * unable to obtain this reference is held and the use count for the
1383 * regulator will be initialised to reflect the current state of the
1386 * This is intended for use by consumers which cannot tolerate shared
1387 * use of the regulator such as those which need to force the
1388 * regulator off for correct operation of the hardware they are
1391 * Use of supply names configured via regulator_set_device_supply() is
1392 * strongly encouraged. It is recommended that the supply name used
1393 * should match the name used for the supply and/or the relevant
1394 * device pins in the datasheet.
1396 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1398 return _regulator_get(dev, id, 1);
1400 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1403 * regulator_put - "free" the regulator source
1404 * @regulator: regulator source
1406 * Note: drivers must ensure that all regulator_enable calls made on this
1407 * regulator source are balanced by regulator_disable calls prior to calling
1410 void regulator_put(struct regulator *regulator)
1412 struct regulator_dev *rdev;
1414 if (regulator == NULL || IS_ERR(regulator))
1417 mutex_lock(®ulator_list_mutex);
1418 rdev = regulator->rdev;
1420 debugfs_remove_recursive(regulator->debugfs);
1422 /* remove any sysfs entries */
1423 if (regulator->dev) {
1424 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1425 device_remove_file(regulator->dev, ®ulator->dev_attr);
1426 kfree(regulator->dev_attr.attr.name);
1428 kfree(regulator->supply_name);
1429 list_del(®ulator->list);
1433 rdev->exclusive = 0;
1435 module_put(rdev->owner);
1436 mutex_unlock(®ulator_list_mutex);
1438 EXPORT_SYMBOL_GPL(regulator_put);
1440 static int devm_regulator_match(struct device *dev, void *res, void *data)
1442 struct regulator **r = res;
1451 * devm_regulator_put - Resource managed regulator_put()
1452 * @regulator: regulator to free
1454 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1455 * this function will not need to be called and the resource management
1456 * code will ensure that the resource is freed.
1458 void devm_regulator_put(struct regulator *regulator)
1462 rc = devres_destroy(regulator->dev, devm_regulator_release,
1463 devm_regulator_match, regulator);
1466 EXPORT_SYMBOL_GPL(devm_regulator_put);
1468 /* locks held by regulator_enable() */
1469 static int _regulator_enable(struct regulator_dev *rdev)
1473 /* check voltage and requested load before enabling */
1474 if (rdev->constraints &&
1475 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1476 drms_uA_update(rdev);
1478 if (rdev->use_count == 0) {
1479 /* The regulator may on if it's not switchable or left on */
1480 ret = _regulator_is_enabled(rdev);
1481 if (ret == -EINVAL || ret == 0) {
1482 if (!_regulator_can_change_status(rdev))
1485 if (!rdev->desc->ops->enable)
1488 /* Query before enabling in case configuration
1490 ret = _regulator_get_enable_time(rdev);
1494 rdev_warn(rdev, "enable_time() failed: %d\n",
1499 trace_regulator_enable(rdev_get_name(rdev));
1501 /* Allow the regulator to ramp; it would be useful
1502 * to extend this for bulk operations so that the
1503 * regulators can ramp together. */
1504 ret = rdev->desc->ops->enable(rdev);
1508 trace_regulator_enable_delay(rdev_get_name(rdev));
1510 if (delay >= 1000) {
1511 mdelay(delay / 1000);
1512 udelay(delay % 1000);
1517 trace_regulator_enable_complete(rdev_get_name(rdev));
1519 } else if (ret < 0) {
1520 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1523 /* Fallthrough on positive return values - already enabled */
1532 * regulator_enable - enable regulator output
1533 * @regulator: regulator source
1535 * Request that the regulator be enabled with the regulator output at
1536 * the predefined voltage or current value. Calls to regulator_enable()
1537 * must be balanced with calls to regulator_disable().
1539 * NOTE: the output value can be set by other drivers, boot loader or may be
1540 * hardwired in the regulator.
1542 int regulator_enable(struct regulator *regulator)
1544 struct regulator_dev *rdev = regulator->rdev;
1547 if (regulator->always_on)
1551 ret = regulator_enable(rdev->supply);
1556 mutex_lock(&rdev->mutex);
1557 ret = _regulator_enable(rdev);
1558 mutex_unlock(&rdev->mutex);
1560 if (ret != 0 && rdev->supply)
1561 regulator_disable(rdev->supply);
1565 EXPORT_SYMBOL_GPL(regulator_enable);
1567 /* locks held by regulator_disable() */
1568 static int _regulator_disable(struct regulator_dev *rdev)
1572 if (WARN(rdev->use_count <= 0,
1573 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1576 /* are we the last user and permitted to disable ? */
1577 if (rdev->use_count == 1 &&
1578 (rdev->constraints && !rdev->constraints->always_on)) {
1580 /* we are last user */
1581 if (_regulator_can_change_status(rdev) &&
1582 rdev->desc->ops->disable) {
1583 trace_regulator_disable(rdev_get_name(rdev));
1585 ret = rdev->desc->ops->disable(rdev);
1587 rdev_err(rdev, "failed to disable\n");
1591 trace_regulator_disable_complete(rdev_get_name(rdev));
1593 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1597 rdev->use_count = 0;
1598 } else if (rdev->use_count > 1) {
1600 if (rdev->constraints &&
1601 (rdev->constraints->valid_ops_mask &
1602 REGULATOR_CHANGE_DRMS))
1603 drms_uA_update(rdev);
1612 * regulator_disable - disable regulator output
1613 * @regulator: regulator source
1615 * Disable the regulator output voltage or current. Calls to
1616 * regulator_enable() must be balanced with calls to
1617 * regulator_disable().
1619 * NOTE: this will only disable the regulator output if no other consumer
1620 * devices have it enabled, the regulator device supports disabling and
1621 * machine constraints permit this operation.
1623 int regulator_disable(struct regulator *regulator)
1625 struct regulator_dev *rdev = regulator->rdev;
1628 if (regulator->always_on)
1631 mutex_lock(&rdev->mutex);
1632 ret = _regulator_disable(rdev);
1633 mutex_unlock(&rdev->mutex);
1635 if (ret == 0 && rdev->supply)
1636 regulator_disable(rdev->supply);
1640 EXPORT_SYMBOL_GPL(regulator_disable);
1642 /* locks held by regulator_force_disable() */
1643 static int _regulator_force_disable(struct regulator_dev *rdev)
1648 if (rdev->desc->ops->disable) {
1649 /* ah well, who wants to live forever... */
1650 ret = rdev->desc->ops->disable(rdev);
1652 rdev_err(rdev, "failed to force disable\n");
1655 /* notify other consumers that power has been forced off */
1656 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1657 REGULATOR_EVENT_DISABLE, NULL);
1664 * regulator_force_disable - force disable regulator output
1665 * @regulator: regulator source
1667 * Forcibly disable the regulator output voltage or current.
1668 * NOTE: this *will* disable the regulator output even if other consumer
1669 * devices have it enabled. This should be used for situations when device
1670 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1672 int regulator_force_disable(struct regulator *regulator)
1674 struct regulator_dev *rdev = regulator->rdev;
1677 mutex_lock(&rdev->mutex);
1678 regulator->uA_load = 0;
1679 ret = _regulator_force_disable(regulator->rdev);
1680 mutex_unlock(&rdev->mutex);
1683 while (rdev->open_count--)
1684 regulator_disable(rdev->supply);
1688 EXPORT_SYMBOL_GPL(regulator_force_disable);
1690 static void regulator_disable_work(struct work_struct *work)
1692 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1696 mutex_lock(&rdev->mutex);
1698 BUG_ON(!rdev->deferred_disables);
1700 count = rdev->deferred_disables;
1701 rdev->deferred_disables = 0;
1703 for (i = 0; i < count; i++) {
1704 ret = _regulator_disable(rdev);
1706 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1709 mutex_unlock(&rdev->mutex);
1712 for (i = 0; i < count; i++) {
1713 ret = regulator_disable(rdev->supply);
1716 "Supply disable failed: %d\n", ret);
1723 * regulator_disable_deferred - disable regulator output with delay
1724 * @regulator: regulator source
1725 * @ms: miliseconds until the regulator is disabled
1727 * Execute regulator_disable() on the regulator after a delay. This
1728 * is intended for use with devices that require some time to quiesce.
1730 * NOTE: this will only disable the regulator output if no other consumer
1731 * devices have it enabled, the regulator device supports disabling and
1732 * machine constraints permit this operation.
1734 int regulator_disable_deferred(struct regulator *regulator, int ms)
1736 struct regulator_dev *rdev = regulator->rdev;
1739 if (regulator->always_on)
1742 mutex_lock(&rdev->mutex);
1743 rdev->deferred_disables++;
1744 mutex_unlock(&rdev->mutex);
1746 ret = schedule_delayed_work(&rdev->disable_work,
1747 msecs_to_jiffies(ms));
1753 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1756 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1758 * @rdev: regulator to operate on
1760 * Regulators that use regmap for their register I/O can set the
1761 * enable_reg and enable_mask fields in their descriptor and then use
1762 * this as their is_enabled operation, saving some code.
1764 int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1769 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1773 return (val & rdev->desc->enable_mask) != 0;
1775 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1778 * regulator_enable_regmap - standard enable() for regmap users
1780 * @rdev: regulator to operate on
1782 * Regulators that use regmap for their register I/O can set the
1783 * enable_reg and enable_mask fields in their descriptor and then use
1784 * this as their enable() operation, saving some code.
1786 int regulator_enable_regmap(struct regulator_dev *rdev)
1788 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1789 rdev->desc->enable_mask,
1790 rdev->desc->enable_mask);
1792 EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1795 * regulator_disable_regmap - standard disable() for regmap users
1797 * @rdev: regulator to operate on
1799 * Regulators that use regmap for their register I/O can set the
1800 * enable_reg and enable_mask fields in their descriptor and then use
1801 * this as their disable() operation, saving some code.
1803 int regulator_disable_regmap(struct regulator_dev *rdev)
1805 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1806 rdev->desc->enable_mask, 0);
1808 EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1810 static int _regulator_is_enabled(struct regulator_dev *rdev)
1812 /* If we don't know then assume that the regulator is always on */
1813 if (!rdev->desc->ops->is_enabled)
1816 return rdev->desc->ops->is_enabled(rdev);
1820 * regulator_is_enabled - is the regulator output enabled
1821 * @regulator: regulator source
1823 * Returns positive if the regulator driver backing the source/client
1824 * has requested that the device be enabled, zero if it hasn't, else a
1825 * negative errno code.
1827 * Note that the device backing this regulator handle can have multiple
1828 * users, so it might be enabled even if regulator_enable() was never
1829 * called for this particular source.
1831 int regulator_is_enabled(struct regulator *regulator)
1835 if (regulator->always_on)
1838 mutex_lock(®ulator->rdev->mutex);
1839 ret = _regulator_is_enabled(regulator->rdev);
1840 mutex_unlock(®ulator->rdev->mutex);
1844 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1847 * regulator_count_voltages - count regulator_list_voltage() selectors
1848 * @regulator: regulator source
1850 * Returns number of selectors, or negative errno. Selectors are
1851 * numbered starting at zero, and typically correspond to bitfields
1852 * in hardware registers.
1854 int regulator_count_voltages(struct regulator *regulator)
1856 struct regulator_dev *rdev = regulator->rdev;
1858 return rdev->desc->n_voltages ? : -EINVAL;
1860 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1863 * regulator_list_voltage - enumerate supported voltages
1864 * @regulator: regulator source
1865 * @selector: identify voltage to list
1866 * Context: can sleep
1868 * Returns a voltage that can be passed to @regulator_set_voltage(),
1869 * zero if this selector code can't be used on this system, or a
1872 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1874 struct regulator_dev *rdev = regulator->rdev;
1875 struct regulator_ops *ops = rdev->desc->ops;
1878 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1881 mutex_lock(&rdev->mutex);
1882 ret = ops->list_voltage(rdev, selector);
1883 mutex_unlock(&rdev->mutex);
1886 if (ret < rdev->constraints->min_uV)
1888 else if (ret > rdev->constraints->max_uV)
1894 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1897 * regulator_is_supported_voltage - check if a voltage range can be supported
1899 * @regulator: Regulator to check.
1900 * @min_uV: Minimum required voltage in uV.
1901 * @max_uV: Maximum required voltage in uV.
1903 * Returns a boolean or a negative error code.
1905 int regulator_is_supported_voltage(struct regulator *regulator,
1906 int min_uV, int max_uV)
1908 int i, voltages, ret;
1910 ret = regulator_count_voltages(regulator);
1915 for (i = 0; i < voltages; i++) {
1916 ret = regulator_list_voltage(regulator, i);
1918 if (ret >= min_uV && ret <= max_uV)
1924 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
1927 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
1929 * @rdev: regulator to operate on
1931 * Regulators that use regmap for their register I/O can set the
1932 * vsel_reg and vsel_mask fields in their descriptor and then use this
1933 * as their get_voltage_vsel operation, saving some code.
1935 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
1940 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
1944 val &= rdev->desc->vsel_mask;
1945 val >>= ffs(rdev->desc->vsel_mask) - 1;
1949 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
1952 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
1954 * @rdev: regulator to operate on
1955 * @sel: Selector to set
1957 * Regulators that use regmap for their register I/O can set the
1958 * vsel_reg and vsel_mask fields in their descriptor and then use this
1959 * as their set_voltage_vsel operation, saving some code.
1961 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
1963 sel <<= ffs(rdev->desc->vsel_mask) - 1;
1965 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
1966 rdev->desc->vsel_mask, sel);
1968 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
1970 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
1971 int min_uV, int max_uV)
1975 unsigned int selector;
1976 int old_selector = -1;
1977 int best_val = INT_MAX;
1979 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
1981 min_uV += rdev->constraints->uV_offset;
1982 max_uV += rdev->constraints->uV_offset;
1985 * If we can't obtain the old selector there is not enough
1986 * info to call set_voltage_time_sel().
1988 if (rdev->desc->ops->set_voltage_time_sel &&
1989 rdev->desc->ops->get_voltage_sel) {
1990 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
1991 if (old_selector < 0)
1992 return old_selector;
1995 if (rdev->desc->ops->set_voltage) {
1996 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
1999 if (rdev->desc->ops->list_voltage)
2000 best_val = rdev->desc->ops->list_voltage(rdev,
2004 } else if (rdev->desc->ops->set_voltage_sel) {
2009 /* Find the smallest voltage that falls within the specified
2012 for (i = 0; i < rdev->desc->n_voltages; i++) {
2013 ret = rdev->desc->ops->list_voltage(rdev, i);
2017 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2023 if (best_val != INT_MAX)
2024 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2031 /* Call set_voltage_time_sel if successfully obtained old_selector */
2032 if (ret == 0 && old_selector >= 0 &&
2033 rdev->desc->ops->set_voltage_time_sel) {
2035 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2036 old_selector, selector);
2038 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2044 /* Insert any necessary delays */
2045 if (delay >= 1000) {
2046 mdelay(delay / 1000);
2047 udelay(delay % 1000);
2053 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2056 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2062 * regulator_set_voltage - set regulator output voltage
2063 * @regulator: regulator source
2064 * @min_uV: Minimum required voltage in uV
2065 * @max_uV: Maximum acceptable voltage in uV
2067 * Sets a voltage regulator to the desired output voltage. This can be set
2068 * during any regulator state. IOW, regulator can be disabled or enabled.
2070 * If the regulator is enabled then the voltage will change to the new value
2071 * immediately otherwise if the regulator is disabled the regulator will
2072 * output at the new voltage when enabled.
2074 * NOTE: If the regulator is shared between several devices then the lowest
2075 * request voltage that meets the system constraints will be used.
2076 * Regulator system constraints must be set for this regulator before
2077 * calling this function otherwise this call will fail.
2079 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2081 struct regulator_dev *rdev = regulator->rdev;
2084 mutex_lock(&rdev->mutex);
2086 /* If we're setting the same range as last time the change
2087 * should be a noop (some cpufreq implementations use the same
2088 * voltage for multiple frequencies, for example).
2090 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2094 if (!rdev->desc->ops->set_voltage &&
2095 !rdev->desc->ops->set_voltage_sel) {
2100 /* constraints check */
2101 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2104 regulator->min_uV = min_uV;
2105 regulator->max_uV = max_uV;
2107 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2111 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2114 mutex_unlock(&rdev->mutex);
2117 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2120 * regulator_set_voltage_time - get raise/fall time
2121 * @regulator: regulator source
2122 * @old_uV: starting voltage in microvolts
2123 * @new_uV: target voltage in microvolts
2125 * Provided with the starting and ending voltage, this function attempts to
2126 * calculate the time in microseconds required to rise or fall to this new
2129 int regulator_set_voltage_time(struct regulator *regulator,
2130 int old_uV, int new_uV)
2132 struct regulator_dev *rdev = regulator->rdev;
2133 struct regulator_ops *ops = rdev->desc->ops;
2139 /* Currently requires operations to do this */
2140 if (!ops->list_voltage || !ops->set_voltage_time_sel
2141 || !rdev->desc->n_voltages)
2144 for (i = 0; i < rdev->desc->n_voltages; i++) {
2145 /* We only look for exact voltage matches here */
2146 voltage = regulator_list_voltage(regulator, i);
2151 if (voltage == old_uV)
2153 if (voltage == new_uV)
2157 if (old_sel < 0 || new_sel < 0)
2160 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2162 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2165 * regulator_sync_voltage - re-apply last regulator output voltage
2166 * @regulator: regulator source
2168 * Re-apply the last configured voltage. This is intended to be used
2169 * where some external control source the consumer is cooperating with
2170 * has caused the configured voltage to change.
2172 int regulator_sync_voltage(struct regulator *regulator)
2174 struct regulator_dev *rdev = regulator->rdev;
2175 int ret, min_uV, max_uV;
2177 mutex_lock(&rdev->mutex);
2179 if (!rdev->desc->ops->set_voltage &&
2180 !rdev->desc->ops->set_voltage_sel) {
2185 /* This is only going to work if we've had a voltage configured. */
2186 if (!regulator->min_uV && !regulator->max_uV) {
2191 min_uV = regulator->min_uV;
2192 max_uV = regulator->max_uV;
2194 /* This should be a paranoia check... */
2195 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2199 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2203 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2206 mutex_unlock(&rdev->mutex);
2209 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2211 static int _regulator_get_voltage(struct regulator_dev *rdev)
2215 if (rdev->desc->ops->get_voltage_sel) {
2216 sel = rdev->desc->ops->get_voltage_sel(rdev);
2219 ret = rdev->desc->ops->list_voltage(rdev, sel);
2220 } else if (rdev->desc->ops->get_voltage) {
2221 ret = rdev->desc->ops->get_voltage(rdev);
2228 return ret - rdev->constraints->uV_offset;
2232 * regulator_get_voltage - get regulator output voltage
2233 * @regulator: regulator source
2235 * This returns the current regulator voltage in uV.
2237 * NOTE: If the regulator is disabled it will return the voltage value. This
2238 * function should not be used to determine regulator state.
2240 int regulator_get_voltage(struct regulator *regulator)
2244 mutex_lock(®ulator->rdev->mutex);
2246 ret = _regulator_get_voltage(regulator->rdev);
2248 mutex_unlock(®ulator->rdev->mutex);
2252 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2255 * regulator_set_current_limit - set regulator output current limit
2256 * @regulator: regulator source
2257 * @min_uA: Minimuum supported current in uA
2258 * @max_uA: Maximum supported current in uA
2260 * Sets current sink to the desired output current. This can be set during
2261 * any regulator state. IOW, regulator can be disabled or enabled.
2263 * If the regulator is enabled then the current will change to the new value
2264 * immediately otherwise if the regulator is disabled the regulator will
2265 * output at the new current when enabled.
2267 * NOTE: Regulator system constraints must be set for this regulator before
2268 * calling this function otherwise this call will fail.
2270 int regulator_set_current_limit(struct regulator *regulator,
2271 int min_uA, int max_uA)
2273 struct regulator_dev *rdev = regulator->rdev;
2276 mutex_lock(&rdev->mutex);
2279 if (!rdev->desc->ops->set_current_limit) {
2284 /* constraints check */
2285 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2289 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2291 mutex_unlock(&rdev->mutex);
2294 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2296 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2300 mutex_lock(&rdev->mutex);
2303 if (!rdev->desc->ops->get_current_limit) {
2308 ret = rdev->desc->ops->get_current_limit(rdev);
2310 mutex_unlock(&rdev->mutex);
2315 * regulator_get_current_limit - get regulator output current
2316 * @regulator: regulator source
2318 * This returns the current supplied by the specified current sink in uA.
2320 * NOTE: If the regulator is disabled it will return the current value. This
2321 * function should not be used to determine regulator state.
2323 int regulator_get_current_limit(struct regulator *regulator)
2325 return _regulator_get_current_limit(regulator->rdev);
2327 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2330 * regulator_set_mode - set regulator operating mode
2331 * @regulator: regulator source
2332 * @mode: operating mode - one of the REGULATOR_MODE constants
2334 * Set regulator operating mode to increase regulator efficiency or improve
2335 * regulation performance.
2337 * NOTE: Regulator system constraints must be set for this regulator before
2338 * calling this function otherwise this call will fail.
2340 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2342 struct regulator_dev *rdev = regulator->rdev;
2344 int regulator_curr_mode;
2346 mutex_lock(&rdev->mutex);
2349 if (!rdev->desc->ops->set_mode) {
2354 /* return if the same mode is requested */
2355 if (rdev->desc->ops->get_mode) {
2356 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2357 if (regulator_curr_mode == mode) {
2363 /* constraints check */
2364 ret = regulator_mode_constrain(rdev, &mode);
2368 ret = rdev->desc->ops->set_mode(rdev, mode);
2370 mutex_unlock(&rdev->mutex);
2373 EXPORT_SYMBOL_GPL(regulator_set_mode);
2375 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2379 mutex_lock(&rdev->mutex);
2382 if (!rdev->desc->ops->get_mode) {
2387 ret = rdev->desc->ops->get_mode(rdev);
2389 mutex_unlock(&rdev->mutex);
2394 * regulator_get_mode - get regulator operating mode
2395 * @regulator: regulator source
2397 * Get the current regulator operating mode.
2399 unsigned int regulator_get_mode(struct regulator *regulator)
2401 return _regulator_get_mode(regulator->rdev);
2403 EXPORT_SYMBOL_GPL(regulator_get_mode);
2406 * regulator_set_optimum_mode - set regulator optimum operating mode
2407 * @regulator: regulator source
2408 * @uA_load: load current
2410 * Notifies the regulator core of a new device load. This is then used by
2411 * DRMS (if enabled by constraints) to set the most efficient regulator
2412 * operating mode for the new regulator loading.
2414 * Consumer devices notify their supply regulator of the maximum power
2415 * they will require (can be taken from device datasheet in the power
2416 * consumption tables) when they change operational status and hence power
2417 * state. Examples of operational state changes that can affect power
2418 * consumption are :-
2420 * o Device is opened / closed.
2421 * o Device I/O is about to begin or has just finished.
2422 * o Device is idling in between work.
2424 * This information is also exported via sysfs to userspace.
2426 * DRMS will sum the total requested load on the regulator and change
2427 * to the most efficient operating mode if platform constraints allow.
2429 * Returns the new regulator mode or error.
2431 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2433 struct regulator_dev *rdev = regulator->rdev;
2434 struct regulator *consumer;
2435 int ret, output_uV, input_uV, total_uA_load = 0;
2438 mutex_lock(&rdev->mutex);
2441 * first check to see if we can set modes at all, otherwise just
2442 * tell the consumer everything is OK.
2444 regulator->uA_load = uA_load;
2445 ret = regulator_check_drms(rdev);
2451 if (!rdev->desc->ops->get_optimum_mode)
2455 * we can actually do this so any errors are indicators of
2456 * potential real failure.
2460 if (!rdev->desc->ops->set_mode)
2463 /* get output voltage */
2464 output_uV = _regulator_get_voltage(rdev);
2465 if (output_uV <= 0) {
2466 rdev_err(rdev, "invalid output voltage found\n");
2470 /* get input voltage */
2473 input_uV = regulator_get_voltage(rdev->supply);
2475 input_uV = rdev->constraints->input_uV;
2476 if (input_uV <= 0) {
2477 rdev_err(rdev, "invalid input voltage found\n");
2481 /* calc total requested load for this regulator */
2482 list_for_each_entry(consumer, &rdev->consumer_list, list)
2483 total_uA_load += consumer->uA_load;
2485 mode = rdev->desc->ops->get_optimum_mode(rdev,
2486 input_uV, output_uV,
2488 ret = regulator_mode_constrain(rdev, &mode);
2490 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2491 total_uA_load, input_uV, output_uV);
2495 ret = rdev->desc->ops->set_mode(rdev, mode);
2497 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2502 mutex_unlock(&rdev->mutex);
2505 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2508 * regulator_register_notifier - register regulator event notifier
2509 * @regulator: regulator source
2510 * @nb: notifier block
2512 * Register notifier block to receive regulator events.
2514 int regulator_register_notifier(struct regulator *regulator,
2515 struct notifier_block *nb)
2517 return blocking_notifier_chain_register(®ulator->rdev->notifier,
2520 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2523 * regulator_unregister_notifier - unregister regulator event notifier
2524 * @regulator: regulator source
2525 * @nb: notifier block
2527 * Unregister regulator event notifier block.
2529 int regulator_unregister_notifier(struct regulator *regulator,
2530 struct notifier_block *nb)
2532 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
2535 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2537 /* notify regulator consumers and downstream regulator consumers.
2538 * Note mutex must be held by caller.
2540 static void _notifier_call_chain(struct regulator_dev *rdev,
2541 unsigned long event, void *data)
2543 /* call rdev chain first */
2544 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
2548 * regulator_bulk_get - get multiple regulator consumers
2550 * @dev: Device to supply
2551 * @num_consumers: Number of consumers to register
2552 * @consumers: Configuration of consumers; clients are stored here.
2554 * @return 0 on success, an errno on failure.
2556 * This helper function allows drivers to get several regulator
2557 * consumers in one operation. If any of the regulators cannot be
2558 * acquired then any regulators that were allocated will be freed
2559 * before returning to the caller.
2561 int regulator_bulk_get(struct device *dev, int num_consumers,
2562 struct regulator_bulk_data *consumers)
2567 for (i = 0; i < num_consumers; i++)
2568 consumers[i].consumer = NULL;
2570 for (i = 0; i < num_consumers; i++) {
2571 consumers[i].consumer = regulator_get(dev,
2572 consumers[i].supply);
2573 if (IS_ERR(consumers[i].consumer)) {
2574 ret = PTR_ERR(consumers[i].consumer);
2575 dev_err(dev, "Failed to get supply '%s': %d\n",
2576 consumers[i].supply, ret);
2577 consumers[i].consumer = NULL;
2586 regulator_put(consumers[i].consumer);
2590 EXPORT_SYMBOL_GPL(regulator_bulk_get);
2593 * devm_regulator_bulk_get - managed get multiple regulator consumers
2595 * @dev: Device to supply
2596 * @num_consumers: Number of consumers to register
2597 * @consumers: Configuration of consumers; clients are stored here.
2599 * @return 0 on success, an errno on failure.
2601 * This helper function allows drivers to get several regulator
2602 * consumers in one operation with management, the regulators will
2603 * automatically be freed when the device is unbound. If any of the
2604 * regulators cannot be acquired then any regulators that were
2605 * allocated will be freed before returning to the caller.
2607 int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2608 struct regulator_bulk_data *consumers)
2613 for (i = 0; i < num_consumers; i++)
2614 consumers[i].consumer = NULL;
2616 for (i = 0; i < num_consumers; i++) {
2617 consumers[i].consumer = devm_regulator_get(dev,
2618 consumers[i].supply);
2619 if (IS_ERR(consumers[i].consumer)) {
2620 ret = PTR_ERR(consumers[i].consumer);
2621 dev_err(dev, "Failed to get supply '%s': %d\n",
2622 consumers[i].supply, ret);
2623 consumers[i].consumer = NULL;
2631 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2632 devm_regulator_put(consumers[i].consumer);
2636 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2638 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2640 struct regulator_bulk_data *bulk = data;
2642 bulk->ret = regulator_enable(bulk->consumer);
2646 * regulator_bulk_enable - enable multiple regulator consumers
2648 * @num_consumers: Number of consumers
2649 * @consumers: Consumer data; clients are stored here.
2650 * @return 0 on success, an errno on failure
2652 * This convenience API allows consumers to enable multiple regulator
2653 * clients in a single API call. If any consumers cannot be enabled
2654 * then any others that were enabled will be disabled again prior to
2657 int regulator_bulk_enable(int num_consumers,
2658 struct regulator_bulk_data *consumers)
2660 LIST_HEAD(async_domain);
2664 for (i = 0; i < num_consumers; i++) {
2665 if (consumers[i].consumer->always_on)
2666 consumers[i].ret = 0;
2668 async_schedule_domain(regulator_bulk_enable_async,
2669 &consumers[i], &async_domain);
2672 async_synchronize_full_domain(&async_domain);
2674 /* If any consumer failed we need to unwind any that succeeded */
2675 for (i = 0; i < num_consumers; i++) {
2676 if (consumers[i].ret != 0) {
2677 ret = consumers[i].ret;
2685 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2687 regulator_disable(consumers[i].consumer);
2691 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2694 * regulator_bulk_disable - disable multiple regulator consumers
2696 * @num_consumers: Number of consumers
2697 * @consumers: Consumer data; clients are stored here.
2698 * @return 0 on success, an errno on failure
2700 * This convenience API allows consumers to disable multiple regulator
2701 * clients in a single API call. If any consumers cannot be disabled
2702 * then any others that were disabled will be enabled again prior to
2705 int regulator_bulk_disable(int num_consumers,
2706 struct regulator_bulk_data *consumers)
2711 for (i = num_consumers - 1; i >= 0; --i) {
2712 ret = regulator_disable(consumers[i].consumer);
2720 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
2721 for (++i; i < num_consumers; ++i) {
2722 r = regulator_enable(consumers[i].consumer);
2724 pr_err("Failed to reename %s: %d\n",
2725 consumers[i].supply, r);
2730 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2733 * regulator_bulk_force_disable - force disable multiple regulator consumers
2735 * @num_consumers: Number of consumers
2736 * @consumers: Consumer data; clients are stored here.
2737 * @return 0 on success, an errno on failure
2739 * This convenience API allows consumers to forcibly disable multiple regulator
2740 * clients in a single API call.
2741 * NOTE: This should be used for situations when device damage will
2742 * likely occur if the regulators are not disabled (e.g. over temp).
2743 * Although regulator_force_disable function call for some consumers can
2744 * return error numbers, the function is called for all consumers.
2746 int regulator_bulk_force_disable(int num_consumers,
2747 struct regulator_bulk_data *consumers)
2752 for (i = 0; i < num_consumers; i++)
2754 regulator_force_disable(consumers[i].consumer);
2756 for (i = 0; i < num_consumers; i++) {
2757 if (consumers[i].ret != 0) {
2758 ret = consumers[i].ret;
2767 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
2770 * regulator_bulk_free - free multiple regulator consumers
2772 * @num_consumers: Number of consumers
2773 * @consumers: Consumer data; clients are stored here.
2775 * This convenience API allows consumers to free multiple regulator
2776 * clients in a single API call.
2778 void regulator_bulk_free(int num_consumers,
2779 struct regulator_bulk_data *consumers)
2783 for (i = 0; i < num_consumers; i++) {
2784 regulator_put(consumers[i].consumer);
2785 consumers[i].consumer = NULL;
2788 EXPORT_SYMBOL_GPL(regulator_bulk_free);
2791 * regulator_notifier_call_chain - call regulator event notifier
2792 * @rdev: regulator source
2793 * @event: notifier block
2794 * @data: callback-specific data.
2796 * Called by regulator drivers to notify clients a regulator event has
2797 * occurred. We also notify regulator clients downstream.
2798 * Note lock must be held by caller.
2800 int regulator_notifier_call_chain(struct regulator_dev *rdev,
2801 unsigned long event, void *data)
2803 _notifier_call_chain(rdev, event, data);
2807 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2810 * regulator_mode_to_status - convert a regulator mode into a status
2812 * @mode: Mode to convert
2814 * Convert a regulator mode into a status.
2816 int regulator_mode_to_status(unsigned int mode)
2819 case REGULATOR_MODE_FAST:
2820 return REGULATOR_STATUS_FAST;
2821 case REGULATOR_MODE_NORMAL:
2822 return REGULATOR_STATUS_NORMAL;
2823 case REGULATOR_MODE_IDLE:
2824 return REGULATOR_STATUS_IDLE;
2825 case REGULATOR_STATUS_STANDBY:
2826 return REGULATOR_STATUS_STANDBY;
2831 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2834 * To avoid cluttering sysfs (and memory) with useless state, only
2835 * create attributes that can be meaningfully displayed.
2837 static int add_regulator_attributes(struct regulator_dev *rdev)
2839 struct device *dev = &rdev->dev;
2840 struct regulator_ops *ops = rdev->desc->ops;
2843 /* some attributes need specific methods to be displayed */
2844 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
2845 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
2846 status = device_create_file(dev, &dev_attr_microvolts);
2850 if (ops->get_current_limit) {
2851 status = device_create_file(dev, &dev_attr_microamps);
2855 if (ops->get_mode) {
2856 status = device_create_file(dev, &dev_attr_opmode);
2860 if (ops->is_enabled) {
2861 status = device_create_file(dev, &dev_attr_state);
2865 if (ops->get_status) {
2866 status = device_create_file(dev, &dev_attr_status);
2871 /* some attributes are type-specific */
2872 if (rdev->desc->type == REGULATOR_CURRENT) {
2873 status = device_create_file(dev, &dev_attr_requested_microamps);
2878 /* all the other attributes exist to support constraints;
2879 * don't show them if there are no constraints, or if the
2880 * relevant supporting methods are missing.
2882 if (!rdev->constraints)
2885 /* constraints need specific supporting methods */
2886 if (ops->set_voltage || ops->set_voltage_sel) {
2887 status = device_create_file(dev, &dev_attr_min_microvolts);
2890 status = device_create_file(dev, &dev_attr_max_microvolts);
2894 if (ops->set_current_limit) {
2895 status = device_create_file(dev, &dev_attr_min_microamps);
2898 status = device_create_file(dev, &dev_attr_max_microamps);
2903 status = device_create_file(dev, &dev_attr_suspend_standby_state);
2906 status = device_create_file(dev, &dev_attr_suspend_mem_state);
2909 status = device_create_file(dev, &dev_attr_suspend_disk_state);
2913 if (ops->set_suspend_voltage) {
2914 status = device_create_file(dev,
2915 &dev_attr_suspend_standby_microvolts);
2918 status = device_create_file(dev,
2919 &dev_attr_suspend_mem_microvolts);
2922 status = device_create_file(dev,
2923 &dev_attr_suspend_disk_microvolts);
2928 if (ops->set_suspend_mode) {
2929 status = device_create_file(dev,
2930 &dev_attr_suspend_standby_mode);
2933 status = device_create_file(dev,
2934 &dev_attr_suspend_mem_mode);
2937 status = device_create_file(dev,
2938 &dev_attr_suspend_disk_mode);
2946 static void rdev_init_debugfs(struct regulator_dev *rdev)
2948 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
2949 if (!rdev->debugfs) {
2950 rdev_warn(rdev, "Failed to create debugfs directory\n");
2954 debugfs_create_u32("use_count", 0444, rdev->debugfs,
2956 debugfs_create_u32("open_count", 0444, rdev->debugfs,
2961 * regulator_register - register regulator
2962 * @regulator_desc: regulator to register
2963 * @config: runtime configuration for regulator
2965 * Called by regulator drivers to register a regulator.
2966 * Returns 0 on success.
2968 struct regulator_dev *
2969 regulator_register(const struct regulator_desc *regulator_desc,
2970 const struct regulator_config *config)
2972 const struct regulation_constraints *constraints = NULL;
2973 const struct regulator_init_data *init_data;
2974 static atomic_t regulator_no = ATOMIC_INIT(0);
2975 struct regulator_dev *rdev;
2978 const char *supply = NULL;
2980 if (regulator_desc == NULL || config == NULL)
2981 return ERR_PTR(-EINVAL);
2986 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2987 return ERR_PTR(-EINVAL);
2989 if (regulator_desc->type != REGULATOR_VOLTAGE &&
2990 regulator_desc->type != REGULATOR_CURRENT)
2991 return ERR_PTR(-EINVAL);
2993 /* Only one of each should be implemented */
2994 WARN_ON(regulator_desc->ops->get_voltage &&
2995 regulator_desc->ops->get_voltage_sel);
2996 WARN_ON(regulator_desc->ops->set_voltage &&
2997 regulator_desc->ops->set_voltage_sel);
2999 /* If we're using selectors we must implement list_voltage. */
3000 if (regulator_desc->ops->get_voltage_sel &&
3001 !regulator_desc->ops->list_voltage) {
3002 return ERR_PTR(-EINVAL);
3004 if (regulator_desc->ops->set_voltage_sel &&
3005 !regulator_desc->ops->list_voltage) {
3006 return ERR_PTR(-EINVAL);
3009 init_data = config->init_data;
3011 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3013 return ERR_PTR(-ENOMEM);
3015 mutex_lock(®ulator_list_mutex);
3017 mutex_init(&rdev->mutex);
3018 rdev->reg_data = config->driver_data;
3019 rdev->owner = regulator_desc->owner;
3020 rdev->desc = regulator_desc;
3021 rdev->regmap = config->regmap;
3022 INIT_LIST_HEAD(&rdev->consumer_list);
3023 INIT_LIST_HEAD(&rdev->list);
3024 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3025 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3027 /* preform any regulator specific init */
3028 if (init_data && init_data->regulator_init) {
3029 ret = init_data->regulator_init(rdev->reg_data);
3034 /* register with sysfs */
3035 rdev->dev.class = ®ulator_class;
3036 rdev->dev.of_node = config->of_node;
3037 rdev->dev.parent = dev;
3038 dev_set_name(&rdev->dev, "regulator.%d",
3039 atomic_inc_return(®ulator_no) - 1);
3040 ret = device_register(&rdev->dev);
3042 put_device(&rdev->dev);
3046 dev_set_drvdata(&rdev->dev, rdev);
3048 /* set regulator constraints */
3050 constraints = &init_data->constraints;
3052 ret = set_machine_constraints(rdev, constraints);
3056 /* add attributes supported by this regulator */
3057 ret = add_regulator_attributes(rdev);
3061 if (init_data && init_data->supply_regulator)
3062 supply = init_data->supply_regulator;
3063 else if (regulator_desc->supply_name)
3064 supply = regulator_desc->supply_name;
3067 struct regulator_dev *r;
3069 r = regulator_dev_lookup(dev, supply, &ret);
3072 dev_err(dev, "Failed to find supply %s\n", supply);
3073 ret = -EPROBE_DEFER;
3077 ret = set_supply(rdev, r);
3081 /* Enable supply if rail is enabled */
3082 if (rdev->desc->ops->is_enabled &&
3083 rdev->desc->ops->is_enabled(rdev)) {
3084 ret = regulator_enable(rdev->supply);
3090 /* add consumers devices */
3092 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3093 ret = set_consumer_device_supply(rdev,
3094 init_data->consumer_supplies[i].dev_name,
3095 init_data->consumer_supplies[i].supply);
3097 dev_err(dev, "Failed to set supply %s\n",
3098 init_data->consumer_supplies[i].supply);
3099 goto unset_supplies;
3104 list_add(&rdev->list, ®ulator_list);
3106 rdev_init_debugfs(rdev);
3108 mutex_unlock(®ulator_list_mutex);
3112 unset_regulator_supplies(rdev);
3115 kfree(rdev->constraints);
3116 device_unregister(&rdev->dev);
3117 /* device core frees rdev */
3118 rdev = ERR_PTR(ret);
3123 rdev = ERR_PTR(ret);
3126 EXPORT_SYMBOL_GPL(regulator_register);
3129 * regulator_unregister - unregister regulator
3130 * @rdev: regulator to unregister
3132 * Called by regulator drivers to unregister a regulator.
3134 void regulator_unregister(struct regulator_dev *rdev)
3140 regulator_put(rdev->supply);
3141 mutex_lock(®ulator_list_mutex);
3142 debugfs_remove_recursive(rdev->debugfs);
3143 flush_work_sync(&rdev->disable_work.work);
3144 WARN_ON(rdev->open_count);
3145 unset_regulator_supplies(rdev);
3146 list_del(&rdev->list);
3147 kfree(rdev->constraints);
3148 device_unregister(&rdev->dev);
3149 mutex_unlock(®ulator_list_mutex);
3151 EXPORT_SYMBOL_GPL(regulator_unregister);
3154 * regulator_suspend_prepare - prepare regulators for system wide suspend
3155 * @state: system suspend state
3157 * Configure each regulator with it's suspend operating parameters for state.
3158 * This will usually be called by machine suspend code prior to supending.
3160 int regulator_suspend_prepare(suspend_state_t state)
3162 struct regulator_dev *rdev;
3165 /* ON is handled by regulator active state */
3166 if (state == PM_SUSPEND_ON)
3169 mutex_lock(®ulator_list_mutex);
3170 list_for_each_entry(rdev, ®ulator_list, list) {
3172 mutex_lock(&rdev->mutex);
3173 ret = suspend_prepare(rdev, state);
3174 mutex_unlock(&rdev->mutex);
3177 rdev_err(rdev, "failed to prepare\n");
3182 mutex_unlock(®ulator_list_mutex);
3185 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3188 * regulator_suspend_finish - resume regulators from system wide suspend
3190 * Turn on regulators that might be turned off by regulator_suspend_prepare
3191 * and that should be turned on according to the regulators properties.
3193 int regulator_suspend_finish(void)
3195 struct regulator_dev *rdev;
3198 mutex_lock(®ulator_list_mutex);
3199 list_for_each_entry(rdev, ®ulator_list, list) {
3200 struct regulator_ops *ops = rdev->desc->ops;
3202 mutex_lock(&rdev->mutex);
3203 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3205 error = ops->enable(rdev);
3209 if (!has_full_constraints)
3213 if (ops->is_enabled && !ops->is_enabled(rdev))
3216 error = ops->disable(rdev);
3221 mutex_unlock(&rdev->mutex);
3223 mutex_unlock(®ulator_list_mutex);
3226 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3229 * regulator_has_full_constraints - the system has fully specified constraints
3231 * Calling this function will cause the regulator API to disable all
3232 * regulators which have a zero use count and don't have an always_on
3233 * constraint in a late_initcall.
3235 * The intention is that this will become the default behaviour in a
3236 * future kernel release so users are encouraged to use this facility
3239 void regulator_has_full_constraints(void)
3241 has_full_constraints = 1;
3243 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3246 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3248 * Calling this function will cause the regulator API to provide a
3249 * dummy regulator to consumers if no physical regulator is found,
3250 * allowing most consumers to proceed as though a regulator were
3251 * configured. This allows systems such as those with software
3252 * controllable regulators for the CPU core only to be brought up more
3255 void regulator_use_dummy_regulator(void)
3257 board_wants_dummy_regulator = true;
3259 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3262 * rdev_get_drvdata - get rdev regulator driver data
3265 * Get rdev regulator driver private data. This call can be used in the
3266 * regulator driver context.
3268 void *rdev_get_drvdata(struct regulator_dev *rdev)
3270 return rdev->reg_data;
3272 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3275 * regulator_get_drvdata - get regulator driver data
3276 * @regulator: regulator
3278 * Get regulator driver private data. This call can be used in the consumer
3279 * driver context when non API regulator specific functions need to be called.
3281 void *regulator_get_drvdata(struct regulator *regulator)
3283 return regulator->rdev->reg_data;
3285 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3288 * regulator_set_drvdata - set regulator driver data
3289 * @regulator: regulator
3292 void regulator_set_drvdata(struct regulator *regulator, void *data)
3294 regulator->rdev->reg_data = data;
3296 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3299 * regulator_get_id - get regulator ID
3302 int rdev_get_id(struct regulator_dev *rdev)
3304 return rdev->desc->id;
3306 EXPORT_SYMBOL_GPL(rdev_get_id);
3308 struct device *rdev_get_dev(struct regulator_dev *rdev)
3312 EXPORT_SYMBOL_GPL(rdev_get_dev);
3314 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3316 return reg_init_data->driver_data;
3318 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3320 #ifdef CONFIG_DEBUG_FS
3321 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3322 size_t count, loff_t *ppos)
3324 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3325 ssize_t len, ret = 0;
3326 struct regulator_map *map;
3331 list_for_each_entry(map, ®ulator_map_list, list) {
3332 len = snprintf(buf + ret, PAGE_SIZE - ret,
3334 rdev_get_name(map->regulator), map->dev_name,
3338 if (ret > PAGE_SIZE) {
3344 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3352 static const struct file_operations supply_map_fops = {
3353 #ifdef CONFIG_DEBUG_FS
3354 .read = supply_map_read_file,
3355 .llseek = default_llseek,
3359 static int __init regulator_init(void)
3363 ret = class_register(®ulator_class);
3365 debugfs_root = debugfs_create_dir("regulator", NULL);
3367 pr_warn("regulator: Failed to create debugfs directory\n");
3369 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3372 regulator_dummy_init();
3377 /* init early to allow our consumers to complete system booting */
3378 core_initcall(regulator_init);
3380 static int __init regulator_init_complete(void)
3382 struct regulator_dev *rdev;
3383 struct regulator_ops *ops;
3384 struct regulation_constraints *c;
3387 mutex_lock(®ulator_list_mutex);
3389 /* If we have a full configuration then disable any regulators
3390 * which are not in use or always_on. This will become the
3391 * default behaviour in the future.
3393 list_for_each_entry(rdev, ®ulator_list, list) {
3394 ops = rdev->desc->ops;
3395 c = rdev->constraints;
3397 if (!ops->disable || (c && c->always_on))
3400 mutex_lock(&rdev->mutex);
3402 if (rdev->use_count)
3405 /* If we can't read the status assume it's on. */
3406 if (ops->is_enabled)
3407 enabled = ops->is_enabled(rdev);
3414 if (has_full_constraints) {
3415 /* We log since this may kill the system if it
3417 rdev_info(rdev, "disabling\n");
3418 ret = ops->disable(rdev);
3420 rdev_err(rdev, "couldn't disable: %d\n", ret);
3423 /* The intention is that in future we will
3424 * assume that full constraints are provided
3425 * so warn even if we aren't going to do
3428 rdev_warn(rdev, "incomplete constraints, leaving on\n");
3432 mutex_unlock(&rdev->mutex);
3435 mutex_unlock(®ulator_list_mutex);
3439 late_initcall(regulator_init_complete);