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 #define pr_fmt(fmt) "%s: " fmt, __func__
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <linux/debugfs.h>
21 #include <linux/device.h>
22 #include <linux/slab.h>
23 #include <linux/async.h>
24 #include <linux/err.h>
25 #include <linux/mutex.h>
26 #include <linux/suspend.h>
27 #include <linux/delay.h>
29 #include <linux/regulator/of_regulator.h>
30 #include <linux/regulator/consumer.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/machine.h>
33 #include <linux/module.h>
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/regulator.h>
40 #define rdev_crit(rdev, fmt, ...) \
41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
42 #define rdev_err(rdev, fmt, ...) \
43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_warn(rdev, fmt, ...) \
45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_info(rdev, fmt, ...) \
47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_dbg(rdev, fmt, ...) \
49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
51 static DEFINE_MUTEX(regulator_list_mutex);
52 static LIST_HEAD(regulator_list);
53 static LIST_HEAD(regulator_map_list);
54 static bool has_full_constraints;
55 static bool board_wants_dummy_regulator;
57 #ifdef CONFIG_DEBUG_FS
58 static struct dentry *debugfs_root;
62 * struct regulator_map
64 * Used to provide symbolic supply names to devices.
66 struct regulator_map {
67 struct list_head list;
68 const char *dev_name; /* The dev_name() for the consumer */
70 struct regulator_dev *regulator;
76 * One for each consumer device.
80 struct list_head list;
85 struct device_attribute dev_attr;
86 struct regulator_dev *rdev;
87 #ifdef CONFIG_DEBUG_FS
88 struct dentry *debugfs;
92 static int _regulator_is_enabled(struct regulator_dev *rdev);
93 static int _regulator_disable(struct regulator_dev *rdev);
94 static int _regulator_get_voltage(struct regulator_dev *rdev);
95 static int _regulator_get_current_limit(struct regulator_dev *rdev);
96 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
97 static void _notifier_call_chain(struct regulator_dev *rdev,
98 unsigned long event, void *data);
99 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
100 int min_uV, int max_uV);
101 static struct regulator *create_regulator(struct regulator_dev *rdev,
103 const char *supply_name);
105 static const char *rdev_get_name(struct regulator_dev *rdev)
107 if (rdev->constraints && rdev->constraints->name)
108 return rdev->constraints->name;
109 else if (rdev->desc->name)
110 return rdev->desc->name;
115 /* gets the regulator for a given consumer device */
116 static struct regulator *get_device_regulator(struct device *dev)
118 struct regulator *regulator = NULL;
119 struct regulator_dev *rdev;
121 mutex_lock(®ulator_list_mutex);
122 list_for_each_entry(rdev, ®ulator_list, list) {
123 mutex_lock(&rdev->mutex);
124 list_for_each_entry(regulator, &rdev->consumer_list, list) {
125 if (regulator->dev == dev) {
126 mutex_unlock(&rdev->mutex);
127 mutex_unlock(®ulator_list_mutex);
131 mutex_unlock(&rdev->mutex);
133 mutex_unlock(®ulator_list_mutex);
138 * of_get_regulator - get a regulator device node based on supply name
139 * @dev: Device pointer for the consumer (of regulator) device
140 * @supply: regulator supply name
142 * Extract the regulator device node corresponding to the supply name.
143 * retruns the device node corresponding to the regulator if found, else
146 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
148 struct device_node *regnode = NULL;
149 char prop_name[32]; /* 32 is max size of property name */
151 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
153 snprintf(prop_name, 32, "%s-supply", supply);
154 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
157 dev_warn(dev, "%s property in node %s references invalid phandle",
158 prop_name, dev->of_node->full_name);
164 /* Platform voltage constraint check */
165 static int regulator_check_voltage(struct regulator_dev *rdev,
166 int *min_uV, int *max_uV)
168 BUG_ON(*min_uV > *max_uV);
170 if (!rdev->constraints) {
171 rdev_err(rdev, "no constraints\n");
174 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
175 rdev_err(rdev, "operation not allowed\n");
179 if (*max_uV > rdev->constraints->max_uV)
180 *max_uV = rdev->constraints->max_uV;
181 if (*min_uV < rdev->constraints->min_uV)
182 *min_uV = rdev->constraints->min_uV;
184 if (*min_uV > *max_uV) {
185 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
193 /* Make sure we select a voltage that suits the needs of all
194 * regulator consumers
196 static int regulator_check_consumers(struct regulator_dev *rdev,
197 int *min_uV, int *max_uV)
199 struct regulator *regulator;
201 list_for_each_entry(regulator, &rdev->consumer_list, list) {
203 * Assume consumers that didn't say anything are OK
204 * with anything in the constraint range.
206 if (!regulator->min_uV && !regulator->max_uV)
209 if (*max_uV > regulator->max_uV)
210 *max_uV = regulator->max_uV;
211 if (*min_uV < regulator->min_uV)
212 *min_uV = regulator->min_uV;
215 if (*min_uV > *max_uV)
221 /* current constraint check */
222 static int regulator_check_current_limit(struct regulator_dev *rdev,
223 int *min_uA, int *max_uA)
225 BUG_ON(*min_uA > *max_uA);
227 if (!rdev->constraints) {
228 rdev_err(rdev, "no constraints\n");
231 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
232 rdev_err(rdev, "operation not allowed\n");
236 if (*max_uA > rdev->constraints->max_uA)
237 *max_uA = rdev->constraints->max_uA;
238 if (*min_uA < rdev->constraints->min_uA)
239 *min_uA = rdev->constraints->min_uA;
241 if (*min_uA > *max_uA) {
242 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
250 /* operating mode constraint check */
251 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
254 case REGULATOR_MODE_FAST:
255 case REGULATOR_MODE_NORMAL:
256 case REGULATOR_MODE_IDLE:
257 case REGULATOR_MODE_STANDBY:
260 rdev_err(rdev, "invalid mode %x specified\n", *mode);
264 if (!rdev->constraints) {
265 rdev_err(rdev, "no constraints\n");
268 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
269 rdev_err(rdev, "operation not allowed\n");
273 /* The modes are bitmasks, the most power hungry modes having
274 * the lowest values. If the requested mode isn't supported
275 * try higher modes. */
277 if (rdev->constraints->valid_modes_mask & *mode)
285 /* dynamic regulator mode switching constraint check */
286 static int regulator_check_drms(struct regulator_dev *rdev)
288 if (!rdev->constraints) {
289 rdev_err(rdev, "no constraints\n");
292 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
293 rdev_err(rdev, "operation not allowed\n");
299 static ssize_t device_requested_uA_show(struct device *dev,
300 struct device_attribute *attr, char *buf)
302 struct regulator *regulator;
304 regulator = get_device_regulator(dev);
305 if (regulator == NULL)
308 return sprintf(buf, "%d\n", regulator->uA_load);
311 static ssize_t regulator_uV_show(struct device *dev,
312 struct device_attribute *attr, char *buf)
314 struct regulator_dev *rdev = dev_get_drvdata(dev);
317 mutex_lock(&rdev->mutex);
318 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
319 mutex_unlock(&rdev->mutex);
323 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
325 static ssize_t regulator_uA_show(struct device *dev,
326 struct device_attribute *attr, char *buf)
328 struct regulator_dev *rdev = dev_get_drvdata(dev);
330 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
332 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
334 static ssize_t regulator_name_show(struct device *dev,
335 struct device_attribute *attr, char *buf)
337 struct regulator_dev *rdev = dev_get_drvdata(dev);
339 return sprintf(buf, "%s\n", rdev_get_name(rdev));
342 static ssize_t regulator_print_opmode(char *buf, int mode)
345 case REGULATOR_MODE_FAST:
346 return sprintf(buf, "fast\n");
347 case REGULATOR_MODE_NORMAL:
348 return sprintf(buf, "normal\n");
349 case REGULATOR_MODE_IDLE:
350 return sprintf(buf, "idle\n");
351 case REGULATOR_MODE_STANDBY:
352 return sprintf(buf, "standby\n");
354 return sprintf(buf, "unknown\n");
357 static ssize_t regulator_opmode_show(struct device *dev,
358 struct device_attribute *attr, char *buf)
360 struct regulator_dev *rdev = dev_get_drvdata(dev);
362 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
364 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
366 static ssize_t regulator_print_state(char *buf, int state)
369 return sprintf(buf, "enabled\n");
371 return sprintf(buf, "disabled\n");
373 return sprintf(buf, "unknown\n");
376 static ssize_t regulator_state_show(struct device *dev,
377 struct device_attribute *attr, char *buf)
379 struct regulator_dev *rdev = dev_get_drvdata(dev);
382 mutex_lock(&rdev->mutex);
383 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
384 mutex_unlock(&rdev->mutex);
388 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
390 static ssize_t regulator_status_show(struct device *dev,
391 struct device_attribute *attr, char *buf)
393 struct regulator_dev *rdev = dev_get_drvdata(dev);
397 status = rdev->desc->ops->get_status(rdev);
402 case REGULATOR_STATUS_OFF:
405 case REGULATOR_STATUS_ON:
408 case REGULATOR_STATUS_ERROR:
411 case REGULATOR_STATUS_FAST:
414 case REGULATOR_STATUS_NORMAL:
417 case REGULATOR_STATUS_IDLE:
420 case REGULATOR_STATUS_STANDBY:
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 regulator_num_users_show(struct device *dev,
495 struct device_attribute *attr, char *buf)
497 struct regulator_dev *rdev = dev_get_drvdata(dev);
498 return sprintf(buf, "%d\n", rdev->use_count);
501 static ssize_t regulator_type_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
504 struct regulator_dev *rdev = dev_get_drvdata(dev);
506 switch (rdev->desc->type) {
507 case REGULATOR_VOLTAGE:
508 return sprintf(buf, "voltage\n");
509 case REGULATOR_CURRENT:
510 return sprintf(buf, "current\n");
512 return sprintf(buf, "unknown\n");
515 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
516 struct device_attribute *attr, char *buf)
518 struct regulator_dev *rdev = dev_get_drvdata(dev);
520 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
522 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
523 regulator_suspend_mem_uV_show, NULL);
525 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
526 struct device_attribute *attr, char *buf)
528 struct regulator_dev *rdev = dev_get_drvdata(dev);
530 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
532 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
533 regulator_suspend_disk_uV_show, NULL);
535 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
536 struct device_attribute *attr, char *buf)
538 struct regulator_dev *rdev = dev_get_drvdata(dev);
540 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
542 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
543 regulator_suspend_standby_uV_show, NULL);
545 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
546 struct device_attribute *attr, char *buf)
548 struct regulator_dev *rdev = dev_get_drvdata(dev);
550 return regulator_print_opmode(buf,
551 rdev->constraints->state_mem.mode);
553 static DEVICE_ATTR(suspend_mem_mode, 0444,
554 regulator_suspend_mem_mode_show, NULL);
556 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
557 struct device_attribute *attr, char *buf)
559 struct regulator_dev *rdev = dev_get_drvdata(dev);
561 return regulator_print_opmode(buf,
562 rdev->constraints->state_disk.mode);
564 static DEVICE_ATTR(suspend_disk_mode, 0444,
565 regulator_suspend_disk_mode_show, NULL);
567 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
568 struct device_attribute *attr, char *buf)
570 struct regulator_dev *rdev = dev_get_drvdata(dev);
572 return regulator_print_opmode(buf,
573 rdev->constraints->state_standby.mode);
575 static DEVICE_ATTR(suspend_standby_mode, 0444,
576 regulator_suspend_standby_mode_show, NULL);
578 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
579 struct device_attribute *attr, char *buf)
581 struct regulator_dev *rdev = dev_get_drvdata(dev);
583 return regulator_print_state(buf,
584 rdev->constraints->state_mem.enabled);
586 static DEVICE_ATTR(suspend_mem_state, 0444,
587 regulator_suspend_mem_state_show, NULL);
589 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
590 struct device_attribute *attr, char *buf)
592 struct regulator_dev *rdev = dev_get_drvdata(dev);
594 return regulator_print_state(buf,
595 rdev->constraints->state_disk.enabled);
597 static DEVICE_ATTR(suspend_disk_state, 0444,
598 regulator_suspend_disk_state_show, NULL);
600 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
601 struct device_attribute *attr, char *buf)
603 struct regulator_dev *rdev = dev_get_drvdata(dev);
605 return regulator_print_state(buf,
606 rdev->constraints->state_standby.enabled);
608 static DEVICE_ATTR(suspend_standby_state, 0444,
609 regulator_suspend_standby_state_show, NULL);
613 * These are the only attributes are present for all regulators.
614 * Other attributes are a function of regulator functionality.
616 static struct device_attribute regulator_dev_attrs[] = {
617 __ATTR(name, 0444, regulator_name_show, NULL),
618 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
619 __ATTR(type, 0444, regulator_type_show, NULL),
623 static void regulator_dev_release(struct device *dev)
625 struct regulator_dev *rdev = dev_get_drvdata(dev);
629 static struct class regulator_class = {
631 .dev_release = regulator_dev_release,
632 .dev_attrs = regulator_dev_attrs,
635 /* Calculate the new optimum regulator operating mode based on the new total
636 * consumer load. All locks held by caller */
637 static void drms_uA_update(struct regulator_dev *rdev)
639 struct regulator *sibling;
640 int current_uA = 0, output_uV, input_uV, err;
643 err = regulator_check_drms(rdev);
644 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
645 (!rdev->desc->ops->get_voltage &&
646 !rdev->desc->ops->get_voltage_sel) ||
647 !rdev->desc->ops->set_mode)
650 /* get output voltage */
651 output_uV = _regulator_get_voltage(rdev);
655 /* get input voltage */
658 input_uV = _regulator_get_voltage(rdev);
660 input_uV = rdev->constraints->input_uV;
664 /* calc total requested load */
665 list_for_each_entry(sibling, &rdev->consumer_list, list)
666 current_uA += sibling->uA_load;
668 /* now get the optimum mode for our new total regulator load */
669 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
670 output_uV, current_uA);
672 /* check the new mode is allowed */
673 err = regulator_mode_constrain(rdev, &mode);
675 rdev->desc->ops->set_mode(rdev, mode);
678 static int suspend_set_state(struct regulator_dev *rdev,
679 struct regulator_state *rstate)
684 can_set_state = rdev->desc->ops->set_suspend_enable &&
685 rdev->desc->ops->set_suspend_disable;
687 /* If we have no suspend mode configration don't set anything;
688 * only warn if the driver actually makes the suspend mode
691 if (!rstate->enabled && !rstate->disabled) {
693 rdev_warn(rdev, "No configuration\n");
697 if (rstate->enabled && rstate->disabled) {
698 rdev_err(rdev, "invalid configuration\n");
702 if (!can_set_state) {
703 rdev_err(rdev, "no way to set suspend state\n");
708 ret = rdev->desc->ops->set_suspend_enable(rdev);
710 ret = rdev->desc->ops->set_suspend_disable(rdev);
712 rdev_err(rdev, "failed to enabled/disable\n");
716 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
717 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
719 rdev_err(rdev, "failed to set voltage\n");
724 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
725 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
727 rdev_err(rdev, "failed to set mode\n");
734 /* locks held by caller */
735 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
737 if (!rdev->constraints)
741 case PM_SUSPEND_STANDBY:
742 return suspend_set_state(rdev,
743 &rdev->constraints->state_standby);
745 return suspend_set_state(rdev,
746 &rdev->constraints->state_mem);
748 return suspend_set_state(rdev,
749 &rdev->constraints->state_disk);
755 static void print_constraints(struct regulator_dev *rdev)
757 struct regulation_constraints *constraints = rdev->constraints;
762 if (constraints->min_uV && constraints->max_uV) {
763 if (constraints->min_uV == constraints->max_uV)
764 count += sprintf(buf + count, "%d mV ",
765 constraints->min_uV / 1000);
767 count += sprintf(buf + count, "%d <--> %d mV ",
768 constraints->min_uV / 1000,
769 constraints->max_uV / 1000);
772 if (!constraints->min_uV ||
773 constraints->min_uV != constraints->max_uV) {
774 ret = _regulator_get_voltage(rdev);
776 count += sprintf(buf + count, "at %d mV ", ret / 1000);
779 if (constraints->uV_offset)
780 count += sprintf(buf, "%dmV offset ",
781 constraints->uV_offset / 1000);
783 if (constraints->min_uA && constraints->max_uA) {
784 if (constraints->min_uA == constraints->max_uA)
785 count += sprintf(buf + count, "%d mA ",
786 constraints->min_uA / 1000);
788 count += sprintf(buf + count, "%d <--> %d mA ",
789 constraints->min_uA / 1000,
790 constraints->max_uA / 1000);
793 if (!constraints->min_uA ||
794 constraints->min_uA != constraints->max_uA) {
795 ret = _regulator_get_current_limit(rdev);
797 count += sprintf(buf + count, "at %d mA ", ret / 1000);
800 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
801 count += sprintf(buf + count, "fast ");
802 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
803 count += sprintf(buf + count, "normal ");
804 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
805 count += sprintf(buf + count, "idle ");
806 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
807 count += sprintf(buf + count, "standby");
809 rdev_info(rdev, "%s\n", buf);
812 static int machine_constraints_voltage(struct regulator_dev *rdev,
813 struct regulation_constraints *constraints)
815 struct regulator_ops *ops = rdev->desc->ops;
818 /* do we need to apply the constraint voltage */
819 if (rdev->constraints->apply_uV &&
820 rdev->constraints->min_uV == rdev->constraints->max_uV) {
821 ret = _regulator_do_set_voltage(rdev,
822 rdev->constraints->min_uV,
823 rdev->constraints->max_uV);
825 rdev_err(rdev, "failed to apply %duV constraint\n",
826 rdev->constraints->min_uV);
831 /* constrain machine-level voltage specs to fit
832 * the actual range supported by this regulator.
834 if (ops->list_voltage && rdev->desc->n_voltages) {
835 int count = rdev->desc->n_voltages;
837 int min_uV = INT_MAX;
838 int max_uV = INT_MIN;
839 int cmin = constraints->min_uV;
840 int cmax = constraints->max_uV;
842 /* it's safe to autoconfigure fixed-voltage supplies
843 and the constraints are used by list_voltage. */
844 if (count == 1 && !cmin) {
847 constraints->min_uV = cmin;
848 constraints->max_uV = cmax;
851 /* voltage constraints are optional */
852 if ((cmin == 0) && (cmax == 0))
855 /* else require explicit machine-level constraints */
856 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
857 rdev_err(rdev, "invalid voltage constraints\n");
861 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
862 for (i = 0; i < count; i++) {
865 value = ops->list_voltage(rdev, i);
869 /* maybe adjust [min_uV..max_uV] */
870 if (value >= cmin && value < min_uV)
872 if (value <= cmax && value > max_uV)
876 /* final: [min_uV..max_uV] valid iff constraints valid */
877 if (max_uV < min_uV) {
878 rdev_err(rdev, "unsupportable voltage constraints\n");
882 /* use regulator's subset of machine constraints */
883 if (constraints->min_uV < min_uV) {
884 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
885 constraints->min_uV, min_uV);
886 constraints->min_uV = min_uV;
888 if (constraints->max_uV > max_uV) {
889 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
890 constraints->max_uV, max_uV);
891 constraints->max_uV = max_uV;
899 * set_machine_constraints - sets regulator constraints
900 * @rdev: regulator source
901 * @constraints: constraints to apply
903 * Allows platform initialisation code to define and constrain
904 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
905 * Constraints *must* be set by platform code in order for some
906 * regulator operations to proceed i.e. set_voltage, set_current_limit,
909 static int set_machine_constraints(struct regulator_dev *rdev,
910 const struct regulation_constraints *constraints)
913 struct regulator_ops *ops = rdev->desc->ops;
916 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
919 rdev->constraints = kzalloc(sizeof(*constraints),
921 if (!rdev->constraints)
924 ret = machine_constraints_voltage(rdev, rdev->constraints);
928 /* do we need to setup our suspend state */
929 if (rdev->constraints->initial_state) {
930 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
932 rdev_err(rdev, "failed to set suspend state\n");
937 if (rdev->constraints->initial_mode) {
938 if (!ops->set_mode) {
939 rdev_err(rdev, "no set_mode operation\n");
944 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
946 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
951 /* If the constraints say the regulator should be on at this point
952 * and we have control then make sure it is enabled.
954 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
956 ret = ops->enable(rdev);
958 rdev_err(rdev, "failed to enable\n");
963 print_constraints(rdev);
966 kfree(rdev->constraints);
967 rdev->constraints = NULL;
972 * set_supply - set regulator supply regulator
973 * @rdev: regulator name
974 * @supply_rdev: supply regulator name
976 * Called by platform initialisation code to set the supply regulator for this
977 * regulator. This ensures that a regulators supply will also be enabled by the
978 * core if it's child is enabled.
980 static int set_supply(struct regulator_dev *rdev,
981 struct regulator_dev *supply_rdev)
985 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
987 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
988 if (rdev->supply == NULL) {
997 * set_consumer_device_supply - Bind a regulator to a symbolic supply
998 * @rdev: regulator source
999 * @consumer_dev: device the supply applies to
1000 * @consumer_dev_name: dev_name() string for device supply applies to
1001 * @supply: symbolic name for supply
1003 * Allows platform initialisation code to map physical regulator
1004 * sources to symbolic names for supplies for use by devices. Devices
1005 * should use these symbolic names to request regulators, avoiding the
1006 * need to provide board-specific regulator names as platform data.
1008 * Only one of consumer_dev and consumer_dev_name may be specified.
1010 static int set_consumer_device_supply(struct regulator_dev *rdev,
1011 struct device *consumer_dev, const char *consumer_dev_name,
1014 struct regulator_map *node;
1017 if (consumer_dev && consumer_dev_name)
1020 if (!consumer_dev_name && consumer_dev)
1021 consumer_dev_name = dev_name(consumer_dev);
1026 if (consumer_dev_name != NULL)
1031 list_for_each_entry(node, ®ulator_map_list, list) {
1032 if (node->dev_name && consumer_dev_name) {
1033 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1035 } else if (node->dev_name || consumer_dev_name) {
1039 if (strcmp(node->supply, supply) != 0)
1042 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
1043 dev_name(&node->regulator->dev),
1044 node->regulator->desc->name,
1046 dev_name(&rdev->dev), rdev_get_name(rdev));
1050 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1054 node->regulator = rdev;
1055 node->supply = supply;
1058 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1059 if (node->dev_name == NULL) {
1065 list_add(&node->list, ®ulator_map_list);
1069 static void unset_regulator_supplies(struct regulator_dev *rdev)
1071 struct regulator_map *node, *n;
1073 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1074 if (rdev == node->regulator) {
1075 list_del(&node->list);
1076 kfree(node->dev_name);
1082 #define REG_STR_SIZE 64
1084 static struct regulator *create_regulator(struct regulator_dev *rdev,
1086 const char *supply_name)
1088 struct regulator *regulator;
1089 char buf[REG_STR_SIZE];
1092 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1093 if (regulator == NULL)
1096 mutex_lock(&rdev->mutex);
1097 regulator->rdev = rdev;
1098 list_add(®ulator->list, &rdev->consumer_list);
1101 /* create a 'requested_microamps_name' sysfs entry */
1102 size = scnprintf(buf, REG_STR_SIZE,
1103 "microamps_requested_%s-%s",
1104 dev_name(dev), supply_name);
1105 if (size >= REG_STR_SIZE)
1108 regulator->dev = dev;
1109 sysfs_attr_init(®ulator->dev_attr.attr);
1110 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1111 if (regulator->dev_attr.attr.name == NULL)
1114 regulator->dev_attr.attr.mode = 0444;
1115 regulator->dev_attr.show = device_requested_uA_show;
1116 err = device_create_file(dev, ®ulator->dev_attr);
1118 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
1122 /* also add a link to the device sysfs entry */
1123 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1124 dev->kobj.name, supply_name);
1125 if (size >= REG_STR_SIZE)
1128 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1129 if (regulator->supply_name == NULL)
1132 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1135 rdev_warn(rdev, "could not add device link %s err %d\n",
1136 dev->kobj.name, err);
1140 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1141 if (regulator->supply_name == NULL)
1145 #ifdef CONFIG_DEBUG_FS
1146 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1148 if (IS_ERR_OR_NULL(regulator->debugfs)) {
1149 rdev_warn(rdev, "Failed to create debugfs directory\n");
1150 regulator->debugfs = NULL;
1152 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1153 ®ulator->uA_load);
1154 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1155 ®ulator->min_uV);
1156 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1157 ®ulator->max_uV);
1161 mutex_unlock(&rdev->mutex);
1164 kfree(regulator->supply_name);
1166 device_remove_file(regulator->dev, ®ulator->dev_attr);
1168 kfree(regulator->dev_attr.attr.name);
1170 list_del(®ulator->list);
1172 mutex_unlock(&rdev->mutex);
1176 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1178 if (!rdev->desc->ops->enable_time)
1180 return rdev->desc->ops->enable_time(rdev);
1183 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1186 struct regulator_dev *r;
1187 struct device_node *node;
1189 /* first do a dt based lookup */
1190 if (dev && dev->of_node) {
1191 node = of_get_regulator(dev, supply);
1193 list_for_each_entry(r, ®ulator_list, list)
1194 if (r->dev.parent &&
1195 node == r->dev.of_node)
1199 /* if not found, try doing it non-dt way */
1200 list_for_each_entry(r, ®ulator_list, list)
1201 if (strcmp(rdev_get_name(r), supply) == 0)
1207 /* Internal regulator request function */
1208 static struct regulator *_regulator_get(struct device *dev, const char *id,
1211 struct regulator_dev *rdev;
1212 struct regulator_map *map;
1213 struct regulator *regulator = ERR_PTR(-ENODEV);
1214 const char *devname = NULL;
1218 pr_err("get() with no identifier\n");
1223 devname = dev_name(dev);
1225 mutex_lock(®ulator_list_mutex);
1227 rdev = regulator_dev_lookup(dev, id);
1231 list_for_each_entry(map, ®ulator_map_list, list) {
1232 /* If the mapping has a device set up it must match */
1233 if (map->dev_name &&
1234 (!devname || strcmp(map->dev_name, devname)))
1237 if (strcmp(map->supply, id) == 0) {
1238 rdev = map->regulator;
1243 if (board_wants_dummy_regulator) {
1244 rdev = dummy_regulator_rdev;
1248 #ifdef CONFIG_REGULATOR_DUMMY
1250 devname = "deviceless";
1252 /* If the board didn't flag that it was fully constrained then
1253 * substitute in a dummy regulator so consumers can continue.
1255 if (!has_full_constraints) {
1256 pr_warn("%s supply %s not found, using dummy regulator\n",
1258 rdev = dummy_regulator_rdev;
1263 mutex_unlock(®ulator_list_mutex);
1267 if (rdev->exclusive) {
1268 regulator = ERR_PTR(-EPERM);
1272 if (exclusive && rdev->open_count) {
1273 regulator = ERR_PTR(-EBUSY);
1277 if (!try_module_get(rdev->owner))
1280 regulator = create_regulator(rdev, dev, id);
1281 if (regulator == NULL) {
1282 regulator = ERR_PTR(-ENOMEM);
1283 module_put(rdev->owner);
1289 rdev->exclusive = 1;
1291 ret = _regulator_is_enabled(rdev);
1293 rdev->use_count = 1;
1295 rdev->use_count = 0;
1299 mutex_unlock(®ulator_list_mutex);
1305 * regulator_get - lookup and obtain a reference to a regulator.
1306 * @dev: device for regulator "consumer"
1307 * @id: Supply name or regulator ID.
1309 * Returns a struct regulator corresponding to the regulator producer,
1310 * or IS_ERR() condition containing errno.
1312 * Use of supply names configured via regulator_set_device_supply() is
1313 * strongly encouraged. It is recommended that the supply name used
1314 * should match the name used for the supply and/or the relevant
1315 * device pins in the datasheet.
1317 struct regulator *regulator_get(struct device *dev, const char *id)
1319 return _regulator_get(dev, id, 0);
1321 EXPORT_SYMBOL_GPL(regulator_get);
1323 static void devm_regulator_release(struct device *dev, void *res)
1325 regulator_put(*(struct regulator **)res);
1329 * devm_regulator_get - Resource managed regulator_get()
1330 * @dev: device for regulator "consumer"
1331 * @id: Supply name or regulator ID.
1333 * Managed regulator_get(). Regulators returned from this function are
1334 * automatically regulator_put() on driver detach. See regulator_get() for more
1337 struct regulator *devm_regulator_get(struct device *dev, const char *id)
1339 struct regulator **ptr, *regulator;
1341 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1343 return ERR_PTR(-ENOMEM);
1345 regulator = regulator_get(dev, id);
1346 if (!IS_ERR(regulator)) {
1348 devres_add(dev, ptr);
1355 EXPORT_SYMBOL_GPL(devm_regulator_get);
1358 * regulator_get_exclusive - obtain exclusive access to a regulator.
1359 * @dev: device for regulator "consumer"
1360 * @id: Supply name or regulator ID.
1362 * Returns a struct regulator corresponding to the regulator producer,
1363 * or IS_ERR() condition containing errno. Other consumers will be
1364 * unable to obtain this reference is held and the use count for the
1365 * regulator will be initialised to reflect the current state of the
1368 * This is intended for use by consumers which cannot tolerate shared
1369 * use of the regulator such as those which need to force the
1370 * regulator off for correct operation of the hardware they are
1373 * Use of supply names configured via regulator_set_device_supply() is
1374 * strongly encouraged. It is recommended that the supply name used
1375 * should match the name used for the supply and/or the relevant
1376 * device pins in the datasheet.
1378 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1380 return _regulator_get(dev, id, 1);
1382 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1385 * regulator_put - "free" the regulator source
1386 * @regulator: regulator source
1388 * Note: drivers must ensure that all regulator_enable calls made on this
1389 * regulator source are balanced by regulator_disable calls prior to calling
1392 void regulator_put(struct regulator *regulator)
1394 struct regulator_dev *rdev;
1396 if (regulator == NULL || IS_ERR(regulator))
1399 mutex_lock(®ulator_list_mutex);
1400 rdev = regulator->rdev;
1402 #ifdef CONFIG_DEBUG_FS
1403 debugfs_remove_recursive(regulator->debugfs);
1406 /* remove any sysfs entries */
1407 if (regulator->dev) {
1408 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1409 device_remove_file(regulator->dev, ®ulator->dev_attr);
1410 kfree(regulator->dev_attr.attr.name);
1412 kfree(regulator->supply_name);
1413 list_del(®ulator->list);
1417 rdev->exclusive = 0;
1419 module_put(rdev->owner);
1420 mutex_unlock(®ulator_list_mutex);
1422 EXPORT_SYMBOL_GPL(regulator_put);
1424 static int devm_regulator_match(struct device *dev, void *res, void *data)
1426 struct regulator **r = res;
1435 * devm_regulator_put - Resource managed regulator_put()
1436 * @regulator: regulator to free
1438 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1439 * this function will not need to be called and the resource management
1440 * code will ensure that the resource is freed.
1442 void devm_regulator_put(struct regulator *regulator)
1446 rc = devres_destroy(regulator->dev, devm_regulator_release,
1447 devm_regulator_match, regulator);
1450 EXPORT_SYMBOL_GPL(devm_regulator_put);
1452 static int _regulator_can_change_status(struct regulator_dev *rdev)
1454 if (!rdev->constraints)
1457 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
1463 /* locks held by regulator_enable() */
1464 static int _regulator_enable(struct regulator_dev *rdev)
1468 /* check voltage and requested load before enabling */
1469 if (rdev->constraints &&
1470 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1471 drms_uA_update(rdev);
1473 if (rdev->use_count == 0) {
1474 /* The regulator may on if it's not switchable or left on */
1475 ret = _regulator_is_enabled(rdev);
1476 if (ret == -EINVAL || ret == 0) {
1477 if (!_regulator_can_change_status(rdev))
1480 if (!rdev->desc->ops->enable)
1483 /* Query before enabling in case configuration
1485 ret = _regulator_get_enable_time(rdev);
1489 rdev_warn(rdev, "enable_time() failed: %d\n",
1494 trace_regulator_enable(rdev_get_name(rdev));
1496 /* Allow the regulator to ramp; it would be useful
1497 * to extend this for bulk operations so that the
1498 * regulators can ramp together. */
1499 ret = rdev->desc->ops->enable(rdev);
1503 trace_regulator_enable_delay(rdev_get_name(rdev));
1505 if (delay >= 1000) {
1506 mdelay(delay / 1000);
1507 udelay(delay % 1000);
1512 trace_regulator_enable_complete(rdev_get_name(rdev));
1514 } else if (ret < 0) {
1515 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1518 /* Fallthrough on positive return values - already enabled */
1527 * regulator_enable - enable regulator output
1528 * @regulator: regulator source
1530 * Request that the regulator be enabled with the regulator output at
1531 * the predefined voltage or current value. Calls to regulator_enable()
1532 * must be balanced with calls to regulator_disable().
1534 * NOTE: the output value can be set by other drivers, boot loader or may be
1535 * hardwired in the regulator.
1537 int regulator_enable(struct regulator *regulator)
1539 struct regulator_dev *rdev = regulator->rdev;
1543 ret = regulator_enable(rdev->supply);
1548 mutex_lock(&rdev->mutex);
1549 ret = _regulator_enable(rdev);
1550 mutex_unlock(&rdev->mutex);
1552 if (ret != 0 && rdev->supply)
1553 regulator_disable(rdev->supply);
1557 EXPORT_SYMBOL_GPL(regulator_enable);
1559 /* locks held by regulator_disable() */
1560 static int _regulator_disable(struct regulator_dev *rdev)
1564 if (WARN(rdev->use_count <= 0,
1565 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1568 /* are we the last user and permitted to disable ? */
1569 if (rdev->use_count == 1 &&
1570 (rdev->constraints && !rdev->constraints->always_on)) {
1572 /* we are last user */
1573 if (_regulator_can_change_status(rdev) &&
1574 rdev->desc->ops->disable) {
1575 trace_regulator_disable(rdev_get_name(rdev));
1577 ret = rdev->desc->ops->disable(rdev);
1579 rdev_err(rdev, "failed to disable\n");
1583 trace_regulator_disable_complete(rdev_get_name(rdev));
1585 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1589 rdev->use_count = 0;
1590 } else if (rdev->use_count > 1) {
1592 if (rdev->constraints &&
1593 (rdev->constraints->valid_ops_mask &
1594 REGULATOR_CHANGE_DRMS))
1595 drms_uA_update(rdev);
1604 * regulator_disable - disable regulator output
1605 * @regulator: regulator source
1607 * Disable the regulator output voltage or current. Calls to
1608 * regulator_enable() must be balanced with calls to
1609 * regulator_disable().
1611 * NOTE: this will only disable the regulator output if no other consumer
1612 * devices have it enabled, the regulator device supports disabling and
1613 * machine constraints permit this operation.
1615 int regulator_disable(struct regulator *regulator)
1617 struct regulator_dev *rdev = regulator->rdev;
1620 mutex_lock(&rdev->mutex);
1621 ret = _regulator_disable(rdev);
1622 mutex_unlock(&rdev->mutex);
1624 if (ret == 0 && rdev->supply)
1625 regulator_disable(rdev->supply);
1629 EXPORT_SYMBOL_GPL(regulator_disable);
1631 /* locks held by regulator_force_disable() */
1632 static int _regulator_force_disable(struct regulator_dev *rdev)
1637 if (rdev->desc->ops->disable) {
1638 /* ah well, who wants to live forever... */
1639 ret = rdev->desc->ops->disable(rdev);
1641 rdev_err(rdev, "failed to force disable\n");
1644 /* notify other consumers that power has been forced off */
1645 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1646 REGULATOR_EVENT_DISABLE, NULL);
1653 * regulator_force_disable - force disable regulator output
1654 * @regulator: regulator source
1656 * Forcibly disable the regulator output voltage or current.
1657 * NOTE: this *will* disable the regulator output even if other consumer
1658 * devices have it enabled. This should be used for situations when device
1659 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1661 int regulator_force_disable(struct regulator *regulator)
1663 struct regulator_dev *rdev = regulator->rdev;
1666 mutex_lock(&rdev->mutex);
1667 regulator->uA_load = 0;
1668 ret = _regulator_force_disable(regulator->rdev);
1669 mutex_unlock(&rdev->mutex);
1672 while (rdev->open_count--)
1673 regulator_disable(rdev->supply);
1677 EXPORT_SYMBOL_GPL(regulator_force_disable);
1679 static void regulator_disable_work(struct work_struct *work)
1681 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1685 mutex_lock(&rdev->mutex);
1687 BUG_ON(!rdev->deferred_disables);
1689 count = rdev->deferred_disables;
1690 rdev->deferred_disables = 0;
1692 for (i = 0; i < count; i++) {
1693 ret = _regulator_disable(rdev);
1695 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1698 mutex_unlock(&rdev->mutex);
1701 for (i = 0; i < count; i++) {
1702 ret = regulator_disable(rdev->supply);
1705 "Supply disable failed: %d\n", ret);
1712 * regulator_disable_deferred - disable regulator output with delay
1713 * @regulator: regulator source
1714 * @ms: miliseconds until the regulator is disabled
1716 * Execute regulator_disable() on the regulator after a delay. This
1717 * is intended for use with devices that require some time to quiesce.
1719 * NOTE: this will only disable the regulator output if no other consumer
1720 * devices have it enabled, the regulator device supports disabling and
1721 * machine constraints permit this operation.
1723 int regulator_disable_deferred(struct regulator *regulator, int ms)
1725 struct regulator_dev *rdev = regulator->rdev;
1728 mutex_lock(&rdev->mutex);
1729 rdev->deferred_disables++;
1730 mutex_unlock(&rdev->mutex);
1732 ret = schedule_delayed_work(&rdev->disable_work,
1733 msecs_to_jiffies(ms));
1739 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1741 static int _regulator_is_enabled(struct regulator_dev *rdev)
1743 /* If we don't know then assume that the regulator is always on */
1744 if (!rdev->desc->ops->is_enabled)
1747 return rdev->desc->ops->is_enabled(rdev);
1751 * regulator_is_enabled - is the regulator output enabled
1752 * @regulator: regulator source
1754 * Returns positive if the regulator driver backing the source/client
1755 * has requested that the device be enabled, zero if it hasn't, else a
1756 * negative errno code.
1758 * Note that the device backing this regulator handle can have multiple
1759 * users, so it might be enabled even if regulator_enable() was never
1760 * called for this particular source.
1762 int regulator_is_enabled(struct regulator *regulator)
1766 mutex_lock(®ulator->rdev->mutex);
1767 ret = _regulator_is_enabled(regulator->rdev);
1768 mutex_unlock(®ulator->rdev->mutex);
1772 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1775 * regulator_count_voltages - count regulator_list_voltage() selectors
1776 * @regulator: regulator source
1778 * Returns number of selectors, or negative errno. Selectors are
1779 * numbered starting at zero, and typically correspond to bitfields
1780 * in hardware registers.
1782 int regulator_count_voltages(struct regulator *regulator)
1784 struct regulator_dev *rdev = regulator->rdev;
1786 return rdev->desc->n_voltages ? : -EINVAL;
1788 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1791 * regulator_list_voltage - enumerate supported voltages
1792 * @regulator: regulator source
1793 * @selector: identify voltage to list
1794 * Context: can sleep
1796 * Returns a voltage that can be passed to @regulator_set_voltage(),
1797 * zero if this selector code can't be used on this system, or a
1800 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1802 struct regulator_dev *rdev = regulator->rdev;
1803 struct regulator_ops *ops = rdev->desc->ops;
1806 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1809 mutex_lock(&rdev->mutex);
1810 ret = ops->list_voltage(rdev, selector);
1811 mutex_unlock(&rdev->mutex);
1814 if (ret < rdev->constraints->min_uV)
1816 else if (ret > rdev->constraints->max_uV)
1822 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1825 * regulator_is_supported_voltage - check if a voltage range can be supported
1827 * @regulator: Regulator to check.
1828 * @min_uV: Minimum required voltage in uV.
1829 * @max_uV: Maximum required voltage in uV.
1831 * Returns a boolean or a negative error code.
1833 int regulator_is_supported_voltage(struct regulator *regulator,
1834 int min_uV, int max_uV)
1836 int i, voltages, ret;
1838 ret = regulator_count_voltages(regulator);
1843 for (i = 0; i < voltages; i++) {
1844 ret = regulator_list_voltage(regulator, i);
1846 if (ret >= min_uV && ret <= max_uV)
1852 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
1854 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
1855 int min_uV, int max_uV)
1859 unsigned int selector;
1861 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
1863 min_uV += rdev->constraints->uV_offset;
1864 max_uV += rdev->constraints->uV_offset;
1866 if (rdev->desc->ops->set_voltage) {
1867 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
1870 if (rdev->desc->ops->list_voltage)
1871 selector = rdev->desc->ops->list_voltage(rdev,
1875 } else if (rdev->desc->ops->set_voltage_sel) {
1876 int best_val = INT_MAX;
1881 /* Find the smallest voltage that falls within the specified
1884 for (i = 0; i < rdev->desc->n_voltages; i++) {
1885 ret = rdev->desc->ops->list_voltage(rdev, i);
1889 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
1896 * If we can't obtain the old selector there is not enough
1897 * info to call set_voltage_time_sel().
1899 if (rdev->desc->ops->set_voltage_time_sel &&
1900 rdev->desc->ops->get_voltage_sel) {
1901 unsigned int old_selector = 0;
1903 ret = rdev->desc->ops->get_voltage_sel(rdev);
1907 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
1908 old_selector, selector);
1911 if (best_val != INT_MAX) {
1912 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
1913 selector = best_val;
1921 /* Insert any necessary delays */
1922 if (delay >= 1000) {
1923 mdelay(delay / 1000);
1924 udelay(delay % 1000);
1930 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
1933 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector);
1939 * regulator_set_voltage - set regulator output voltage
1940 * @regulator: regulator source
1941 * @min_uV: Minimum required voltage in uV
1942 * @max_uV: Maximum acceptable voltage in uV
1944 * Sets a voltage regulator to the desired output voltage. This can be set
1945 * during any regulator state. IOW, regulator can be disabled or enabled.
1947 * If the regulator is enabled then the voltage will change to the new value
1948 * immediately otherwise if the regulator is disabled the regulator will
1949 * output at the new voltage when enabled.
1951 * NOTE: If the regulator is shared between several devices then the lowest
1952 * request voltage that meets the system constraints will be used.
1953 * Regulator system constraints must be set for this regulator before
1954 * calling this function otherwise this call will fail.
1956 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1958 struct regulator_dev *rdev = regulator->rdev;
1961 mutex_lock(&rdev->mutex);
1963 /* If we're setting the same range as last time the change
1964 * should be a noop (some cpufreq implementations use the same
1965 * voltage for multiple frequencies, for example).
1967 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
1971 if (!rdev->desc->ops->set_voltage &&
1972 !rdev->desc->ops->set_voltage_sel) {
1977 /* constraints check */
1978 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1981 regulator->min_uV = min_uV;
1982 regulator->max_uV = max_uV;
1984 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
1988 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
1991 mutex_unlock(&rdev->mutex);
1994 EXPORT_SYMBOL_GPL(regulator_set_voltage);
1997 * regulator_set_voltage_time - get raise/fall time
1998 * @regulator: regulator source
1999 * @old_uV: starting voltage in microvolts
2000 * @new_uV: target voltage in microvolts
2002 * Provided with the starting and ending voltage, this function attempts to
2003 * calculate the time in microseconds required to rise or fall to this new
2006 int regulator_set_voltage_time(struct regulator *regulator,
2007 int old_uV, int new_uV)
2009 struct regulator_dev *rdev = regulator->rdev;
2010 struct regulator_ops *ops = rdev->desc->ops;
2016 /* Currently requires operations to do this */
2017 if (!ops->list_voltage || !ops->set_voltage_time_sel
2018 || !rdev->desc->n_voltages)
2021 for (i = 0; i < rdev->desc->n_voltages; i++) {
2022 /* We only look for exact voltage matches here */
2023 voltage = regulator_list_voltage(regulator, i);
2028 if (voltage == old_uV)
2030 if (voltage == new_uV)
2034 if (old_sel < 0 || new_sel < 0)
2037 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2039 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2042 * regulator_sync_voltage - re-apply last regulator output voltage
2043 * @regulator: regulator source
2045 * Re-apply the last configured voltage. This is intended to be used
2046 * where some external control source the consumer is cooperating with
2047 * has caused the configured voltage to change.
2049 int regulator_sync_voltage(struct regulator *regulator)
2051 struct regulator_dev *rdev = regulator->rdev;
2052 int ret, min_uV, max_uV;
2054 mutex_lock(&rdev->mutex);
2056 if (!rdev->desc->ops->set_voltage &&
2057 !rdev->desc->ops->set_voltage_sel) {
2062 /* This is only going to work if we've had a voltage configured. */
2063 if (!regulator->min_uV && !regulator->max_uV) {
2068 min_uV = regulator->min_uV;
2069 max_uV = regulator->max_uV;
2071 /* This should be a paranoia check... */
2072 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2076 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2080 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2083 mutex_unlock(&rdev->mutex);
2086 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2088 static int _regulator_get_voltage(struct regulator_dev *rdev)
2092 if (rdev->desc->ops->get_voltage_sel) {
2093 sel = rdev->desc->ops->get_voltage_sel(rdev);
2096 ret = rdev->desc->ops->list_voltage(rdev, sel);
2097 } else if (rdev->desc->ops->get_voltage) {
2098 ret = rdev->desc->ops->get_voltage(rdev);
2105 return ret - rdev->constraints->uV_offset;
2109 * regulator_get_voltage - get regulator output voltage
2110 * @regulator: regulator source
2112 * This returns the current regulator voltage in uV.
2114 * NOTE: If the regulator is disabled it will return the voltage value. This
2115 * function should not be used to determine regulator state.
2117 int regulator_get_voltage(struct regulator *regulator)
2121 mutex_lock(®ulator->rdev->mutex);
2123 ret = _regulator_get_voltage(regulator->rdev);
2125 mutex_unlock(®ulator->rdev->mutex);
2129 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2132 * regulator_set_current_limit - set regulator output current limit
2133 * @regulator: regulator source
2134 * @min_uA: Minimuum supported current in uA
2135 * @max_uA: Maximum supported current in uA
2137 * Sets current sink to the desired output current. This can be set during
2138 * any regulator state. IOW, regulator can be disabled or enabled.
2140 * If the regulator is enabled then the current will change to the new value
2141 * immediately otherwise if the regulator is disabled the regulator will
2142 * output at the new current when enabled.
2144 * NOTE: Regulator system constraints must be set for this regulator before
2145 * calling this function otherwise this call will fail.
2147 int regulator_set_current_limit(struct regulator *regulator,
2148 int min_uA, int max_uA)
2150 struct regulator_dev *rdev = regulator->rdev;
2153 mutex_lock(&rdev->mutex);
2156 if (!rdev->desc->ops->set_current_limit) {
2161 /* constraints check */
2162 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2166 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2168 mutex_unlock(&rdev->mutex);
2171 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2173 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2177 mutex_lock(&rdev->mutex);
2180 if (!rdev->desc->ops->get_current_limit) {
2185 ret = rdev->desc->ops->get_current_limit(rdev);
2187 mutex_unlock(&rdev->mutex);
2192 * regulator_get_current_limit - get regulator output current
2193 * @regulator: regulator source
2195 * This returns the current supplied by the specified current sink in uA.
2197 * NOTE: If the regulator is disabled it will return the current value. This
2198 * function should not be used to determine regulator state.
2200 int regulator_get_current_limit(struct regulator *regulator)
2202 return _regulator_get_current_limit(regulator->rdev);
2204 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2207 * regulator_set_mode - set regulator operating mode
2208 * @regulator: regulator source
2209 * @mode: operating mode - one of the REGULATOR_MODE constants
2211 * Set regulator operating mode to increase regulator efficiency or improve
2212 * regulation performance.
2214 * NOTE: Regulator system constraints must be set for this regulator before
2215 * calling this function otherwise this call will fail.
2217 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2219 struct regulator_dev *rdev = regulator->rdev;
2221 int regulator_curr_mode;
2223 mutex_lock(&rdev->mutex);
2226 if (!rdev->desc->ops->set_mode) {
2231 /* return if the same mode is requested */
2232 if (rdev->desc->ops->get_mode) {
2233 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2234 if (regulator_curr_mode == mode) {
2240 /* constraints check */
2241 ret = regulator_mode_constrain(rdev, &mode);
2245 ret = rdev->desc->ops->set_mode(rdev, mode);
2247 mutex_unlock(&rdev->mutex);
2250 EXPORT_SYMBOL_GPL(regulator_set_mode);
2252 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2256 mutex_lock(&rdev->mutex);
2259 if (!rdev->desc->ops->get_mode) {
2264 ret = rdev->desc->ops->get_mode(rdev);
2266 mutex_unlock(&rdev->mutex);
2271 * regulator_get_mode - get regulator operating mode
2272 * @regulator: regulator source
2274 * Get the current regulator operating mode.
2276 unsigned int regulator_get_mode(struct regulator *regulator)
2278 return _regulator_get_mode(regulator->rdev);
2280 EXPORT_SYMBOL_GPL(regulator_get_mode);
2283 * regulator_set_optimum_mode - set regulator optimum operating mode
2284 * @regulator: regulator source
2285 * @uA_load: load current
2287 * Notifies the regulator core of a new device load. This is then used by
2288 * DRMS (if enabled by constraints) to set the most efficient regulator
2289 * operating mode for the new regulator loading.
2291 * Consumer devices notify their supply regulator of the maximum power
2292 * they will require (can be taken from device datasheet in the power
2293 * consumption tables) when they change operational status and hence power
2294 * state. Examples of operational state changes that can affect power
2295 * consumption are :-
2297 * o Device is opened / closed.
2298 * o Device I/O is about to begin or has just finished.
2299 * o Device is idling in between work.
2301 * This information is also exported via sysfs to userspace.
2303 * DRMS will sum the total requested load on the regulator and change
2304 * to the most efficient operating mode if platform constraints allow.
2306 * Returns the new regulator mode or error.
2308 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2310 struct regulator_dev *rdev = regulator->rdev;
2311 struct regulator *consumer;
2312 int ret, output_uV, input_uV, total_uA_load = 0;
2315 mutex_lock(&rdev->mutex);
2318 * first check to see if we can set modes at all, otherwise just
2319 * tell the consumer everything is OK.
2321 regulator->uA_load = uA_load;
2322 ret = regulator_check_drms(rdev);
2328 if (!rdev->desc->ops->get_optimum_mode)
2332 * we can actually do this so any errors are indicators of
2333 * potential real failure.
2337 /* get output voltage */
2338 output_uV = _regulator_get_voltage(rdev);
2339 if (output_uV <= 0) {
2340 rdev_err(rdev, "invalid output voltage found\n");
2344 /* get input voltage */
2347 input_uV = regulator_get_voltage(rdev->supply);
2349 input_uV = rdev->constraints->input_uV;
2350 if (input_uV <= 0) {
2351 rdev_err(rdev, "invalid input voltage found\n");
2355 /* calc total requested load for this regulator */
2356 list_for_each_entry(consumer, &rdev->consumer_list, list)
2357 total_uA_load += consumer->uA_load;
2359 mode = rdev->desc->ops->get_optimum_mode(rdev,
2360 input_uV, output_uV,
2362 ret = regulator_mode_constrain(rdev, &mode);
2364 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2365 total_uA_load, input_uV, output_uV);
2369 ret = rdev->desc->ops->set_mode(rdev, mode);
2371 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2376 mutex_unlock(&rdev->mutex);
2379 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2382 * regulator_register_notifier - register regulator event notifier
2383 * @regulator: regulator source
2384 * @nb: notifier block
2386 * Register notifier block to receive regulator events.
2388 int regulator_register_notifier(struct regulator *regulator,
2389 struct notifier_block *nb)
2391 return blocking_notifier_chain_register(®ulator->rdev->notifier,
2394 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2397 * regulator_unregister_notifier - unregister regulator event notifier
2398 * @regulator: regulator source
2399 * @nb: notifier block
2401 * Unregister regulator event notifier block.
2403 int regulator_unregister_notifier(struct regulator *regulator,
2404 struct notifier_block *nb)
2406 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
2409 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2411 /* notify regulator consumers and downstream regulator consumers.
2412 * Note mutex must be held by caller.
2414 static void _notifier_call_chain(struct regulator_dev *rdev,
2415 unsigned long event, void *data)
2417 /* call rdev chain first */
2418 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
2422 * regulator_bulk_get - get multiple regulator consumers
2424 * @dev: Device to supply
2425 * @num_consumers: Number of consumers to register
2426 * @consumers: Configuration of consumers; clients are stored here.
2428 * @return 0 on success, an errno on failure.
2430 * This helper function allows drivers to get several regulator
2431 * consumers in one operation. If any of the regulators cannot be
2432 * acquired then any regulators that were allocated will be freed
2433 * before returning to the caller.
2435 int regulator_bulk_get(struct device *dev, int num_consumers,
2436 struct regulator_bulk_data *consumers)
2441 for (i = 0; i < num_consumers; i++)
2442 consumers[i].consumer = NULL;
2444 for (i = 0; i < num_consumers; i++) {
2445 consumers[i].consumer = regulator_get(dev,
2446 consumers[i].supply);
2447 if (IS_ERR(consumers[i].consumer)) {
2448 ret = PTR_ERR(consumers[i].consumer);
2449 dev_err(dev, "Failed to get supply '%s': %d\n",
2450 consumers[i].supply, ret);
2451 consumers[i].consumer = NULL;
2459 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2460 regulator_put(consumers[i].consumer);
2464 EXPORT_SYMBOL_GPL(regulator_bulk_get);
2467 * devm_regulator_bulk_get - managed get multiple regulator consumers
2469 * @dev: Device to supply
2470 * @num_consumers: Number of consumers to register
2471 * @consumers: Configuration of consumers; clients are stored here.
2473 * @return 0 on success, an errno on failure.
2475 * This helper function allows drivers to get several regulator
2476 * consumers in one operation with management, the regulators will
2477 * automatically be freed when the device is unbound. If any of the
2478 * regulators cannot be acquired then any regulators that were
2479 * allocated will be freed before returning to the caller.
2481 int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2482 struct regulator_bulk_data *consumers)
2487 for (i = 0; i < num_consumers; i++)
2488 consumers[i].consumer = NULL;
2490 for (i = 0; i < num_consumers; i++) {
2491 consumers[i].consumer = devm_regulator_get(dev,
2492 consumers[i].supply);
2493 if (IS_ERR(consumers[i].consumer)) {
2494 ret = PTR_ERR(consumers[i].consumer);
2495 dev_err(dev, "Failed to get supply '%s': %d\n",
2496 consumers[i].supply, ret);
2497 consumers[i].consumer = NULL;
2505 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2506 devm_regulator_put(consumers[i].consumer);
2510 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2512 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2514 struct regulator_bulk_data *bulk = data;
2516 bulk->ret = regulator_enable(bulk->consumer);
2520 * regulator_bulk_enable - enable multiple regulator consumers
2522 * @num_consumers: Number of consumers
2523 * @consumers: Consumer data; clients are stored here.
2524 * @return 0 on success, an errno on failure
2526 * This convenience API allows consumers to enable multiple regulator
2527 * clients in a single API call. If any consumers cannot be enabled
2528 * then any others that were enabled will be disabled again prior to
2531 int regulator_bulk_enable(int num_consumers,
2532 struct regulator_bulk_data *consumers)
2534 LIST_HEAD(async_domain);
2538 for (i = 0; i < num_consumers; i++)
2539 async_schedule_domain(regulator_bulk_enable_async,
2540 &consumers[i], &async_domain);
2542 async_synchronize_full_domain(&async_domain);
2544 /* If any consumer failed we need to unwind any that succeeded */
2545 for (i = 0; i < num_consumers; i++) {
2546 if (consumers[i].ret != 0) {
2547 ret = consumers[i].ret;
2555 for (i = 0; i < num_consumers; i++)
2556 if (consumers[i].ret == 0)
2557 regulator_disable(consumers[i].consumer);
2559 pr_err("Failed to enable %s: %d\n",
2560 consumers[i].supply, consumers[i].ret);
2564 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2567 * regulator_bulk_disable - disable multiple regulator consumers
2569 * @num_consumers: Number of consumers
2570 * @consumers: Consumer data; clients are stored here.
2571 * @return 0 on success, an errno on failure
2573 * This convenience API allows consumers to disable multiple regulator
2574 * clients in a single API call. If any consumers cannot be enabled
2575 * then any others that were disabled will be disabled again prior to
2578 int regulator_bulk_disable(int num_consumers,
2579 struct regulator_bulk_data *consumers)
2584 for (i = 0; i < num_consumers; i++) {
2585 ret = regulator_disable(consumers[i].consumer);
2593 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
2594 for (--i; i >= 0; --i)
2595 regulator_enable(consumers[i].consumer);
2599 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2602 * regulator_bulk_force_disable - force disable multiple regulator consumers
2604 * @num_consumers: Number of consumers
2605 * @consumers: Consumer data; clients are stored here.
2606 * @return 0 on success, an errno on failure
2608 * This convenience API allows consumers to forcibly disable multiple regulator
2609 * clients in a single API call.
2610 * NOTE: This should be used for situations when device damage will
2611 * likely occur if the regulators are not disabled (e.g. over temp).
2612 * Although regulator_force_disable function call for some consumers can
2613 * return error numbers, the function is called for all consumers.
2615 int regulator_bulk_force_disable(int num_consumers,
2616 struct regulator_bulk_data *consumers)
2621 for (i = 0; i < num_consumers; i++)
2623 regulator_force_disable(consumers[i].consumer);
2625 for (i = 0; i < num_consumers; i++) {
2626 if (consumers[i].ret != 0) {
2627 ret = consumers[i].ret;
2636 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
2639 * regulator_bulk_free - free multiple regulator consumers
2641 * @num_consumers: Number of consumers
2642 * @consumers: Consumer data; clients are stored here.
2644 * This convenience API allows consumers to free multiple regulator
2645 * clients in a single API call.
2647 void regulator_bulk_free(int num_consumers,
2648 struct regulator_bulk_data *consumers)
2652 for (i = 0; i < num_consumers; i++) {
2653 regulator_put(consumers[i].consumer);
2654 consumers[i].consumer = NULL;
2657 EXPORT_SYMBOL_GPL(regulator_bulk_free);
2660 * regulator_notifier_call_chain - call regulator event notifier
2661 * @rdev: regulator source
2662 * @event: notifier block
2663 * @data: callback-specific data.
2665 * Called by regulator drivers to notify clients a regulator event has
2666 * occurred. We also notify regulator clients downstream.
2667 * Note lock must be held by caller.
2669 int regulator_notifier_call_chain(struct regulator_dev *rdev,
2670 unsigned long event, void *data)
2672 _notifier_call_chain(rdev, event, data);
2676 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2679 * regulator_mode_to_status - convert a regulator mode into a status
2681 * @mode: Mode to convert
2683 * Convert a regulator mode into a status.
2685 int regulator_mode_to_status(unsigned int mode)
2688 case REGULATOR_MODE_FAST:
2689 return REGULATOR_STATUS_FAST;
2690 case REGULATOR_MODE_NORMAL:
2691 return REGULATOR_STATUS_NORMAL;
2692 case REGULATOR_MODE_IDLE:
2693 return REGULATOR_STATUS_IDLE;
2694 case REGULATOR_STATUS_STANDBY:
2695 return REGULATOR_STATUS_STANDBY;
2700 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2703 * To avoid cluttering sysfs (and memory) with useless state, only
2704 * create attributes that can be meaningfully displayed.
2706 static int add_regulator_attributes(struct regulator_dev *rdev)
2708 struct device *dev = &rdev->dev;
2709 struct regulator_ops *ops = rdev->desc->ops;
2712 /* some attributes need specific methods to be displayed */
2713 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
2714 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
2715 status = device_create_file(dev, &dev_attr_microvolts);
2719 if (ops->get_current_limit) {
2720 status = device_create_file(dev, &dev_attr_microamps);
2724 if (ops->get_mode) {
2725 status = device_create_file(dev, &dev_attr_opmode);
2729 if (ops->is_enabled) {
2730 status = device_create_file(dev, &dev_attr_state);
2734 if (ops->get_status) {
2735 status = device_create_file(dev, &dev_attr_status);
2740 /* some attributes are type-specific */
2741 if (rdev->desc->type == REGULATOR_CURRENT) {
2742 status = device_create_file(dev, &dev_attr_requested_microamps);
2747 /* all the other attributes exist to support constraints;
2748 * don't show them if there are no constraints, or if the
2749 * relevant supporting methods are missing.
2751 if (!rdev->constraints)
2754 /* constraints need specific supporting methods */
2755 if (ops->set_voltage || ops->set_voltage_sel) {
2756 status = device_create_file(dev, &dev_attr_min_microvolts);
2759 status = device_create_file(dev, &dev_attr_max_microvolts);
2763 if (ops->set_current_limit) {
2764 status = device_create_file(dev, &dev_attr_min_microamps);
2767 status = device_create_file(dev, &dev_attr_max_microamps);
2772 /* suspend mode constraints need multiple supporting methods */
2773 if (!(ops->set_suspend_enable && ops->set_suspend_disable))
2776 status = device_create_file(dev, &dev_attr_suspend_standby_state);
2779 status = device_create_file(dev, &dev_attr_suspend_mem_state);
2782 status = device_create_file(dev, &dev_attr_suspend_disk_state);
2786 if (ops->set_suspend_voltage) {
2787 status = device_create_file(dev,
2788 &dev_attr_suspend_standby_microvolts);
2791 status = device_create_file(dev,
2792 &dev_attr_suspend_mem_microvolts);
2795 status = device_create_file(dev,
2796 &dev_attr_suspend_disk_microvolts);
2801 if (ops->set_suspend_mode) {
2802 status = device_create_file(dev,
2803 &dev_attr_suspend_standby_mode);
2806 status = device_create_file(dev,
2807 &dev_attr_suspend_mem_mode);
2810 status = device_create_file(dev,
2811 &dev_attr_suspend_disk_mode);
2819 static void rdev_init_debugfs(struct regulator_dev *rdev)
2821 #ifdef CONFIG_DEBUG_FS
2822 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
2823 if (IS_ERR(rdev->debugfs) || !rdev->debugfs) {
2824 rdev_warn(rdev, "Failed to create debugfs directory\n");
2825 rdev->debugfs = NULL;
2829 debugfs_create_u32("use_count", 0444, rdev->debugfs,
2831 debugfs_create_u32("open_count", 0444, rdev->debugfs,
2837 * regulator_register - register regulator
2838 * @regulator_desc: regulator to register
2839 * @dev: struct device for the regulator
2840 * @init_data: platform provided init data, passed through by driver
2841 * @driver_data: private regulator data
2842 * @of_node: OpenFirmware node to parse for device tree bindings (may be
2845 * Called by regulator drivers to register a regulator.
2846 * Returns 0 on success.
2848 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
2849 struct device *dev, const struct regulator_init_data *init_data,
2850 void *driver_data, struct device_node *of_node)
2852 const struct regulation_constraints *constraints = NULL;
2853 static atomic_t regulator_no = ATOMIC_INIT(0);
2854 struct regulator_dev *rdev;
2856 const char *supply = NULL;
2858 if (regulator_desc == NULL)
2859 return ERR_PTR(-EINVAL);
2861 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2862 return ERR_PTR(-EINVAL);
2864 if (regulator_desc->type != REGULATOR_VOLTAGE &&
2865 regulator_desc->type != REGULATOR_CURRENT)
2866 return ERR_PTR(-EINVAL);
2868 /* Only one of each should be implemented */
2869 WARN_ON(regulator_desc->ops->get_voltage &&
2870 regulator_desc->ops->get_voltage_sel);
2871 WARN_ON(regulator_desc->ops->set_voltage &&
2872 regulator_desc->ops->set_voltage_sel);
2874 /* If we're using selectors we must implement list_voltage. */
2875 if (regulator_desc->ops->get_voltage_sel &&
2876 !regulator_desc->ops->list_voltage) {
2877 return ERR_PTR(-EINVAL);
2879 if (regulator_desc->ops->set_voltage_sel &&
2880 !regulator_desc->ops->list_voltage) {
2881 return ERR_PTR(-EINVAL);
2884 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2886 return ERR_PTR(-ENOMEM);
2888 mutex_lock(®ulator_list_mutex);
2890 mutex_init(&rdev->mutex);
2891 rdev->reg_data = driver_data;
2892 rdev->owner = regulator_desc->owner;
2893 rdev->desc = regulator_desc;
2894 INIT_LIST_HEAD(&rdev->consumer_list);
2895 INIT_LIST_HEAD(&rdev->list);
2896 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2897 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
2899 /* preform any regulator specific init */
2900 if (init_data && init_data->regulator_init) {
2901 ret = init_data->regulator_init(rdev->reg_data);
2906 /* register with sysfs */
2907 rdev->dev.class = ®ulator_class;
2908 rdev->dev.of_node = of_node;
2909 rdev->dev.parent = dev;
2910 dev_set_name(&rdev->dev, "regulator.%d",
2911 atomic_inc_return(®ulator_no) - 1);
2912 ret = device_register(&rdev->dev);
2914 put_device(&rdev->dev);
2918 dev_set_drvdata(&rdev->dev, rdev);
2920 /* set regulator constraints */
2922 constraints = &init_data->constraints;
2924 ret = set_machine_constraints(rdev, constraints);
2928 /* add attributes supported by this regulator */
2929 ret = add_regulator_attributes(rdev);
2933 if (init_data && init_data->supply_regulator)
2934 supply = init_data->supply_regulator;
2935 else if (regulator_desc->supply_name)
2936 supply = regulator_desc->supply_name;
2939 struct regulator_dev *r;
2941 r = regulator_dev_lookup(dev, supply);
2944 dev_err(dev, "Failed to find supply %s\n", supply);
2949 ret = set_supply(rdev, r);
2953 /* Enable supply if rail is enabled */
2954 if (rdev->desc->ops->is_enabled &&
2955 rdev->desc->ops->is_enabled(rdev)) {
2956 ret = regulator_enable(rdev->supply);
2962 /* add consumers devices */
2964 for (i = 0; i < init_data->num_consumer_supplies; i++) {
2965 ret = set_consumer_device_supply(rdev,
2966 init_data->consumer_supplies[i].dev,
2967 init_data->consumer_supplies[i].dev_name,
2968 init_data->consumer_supplies[i].supply);
2970 dev_err(dev, "Failed to set supply %s\n",
2971 init_data->consumer_supplies[i].supply);
2972 goto unset_supplies;
2977 list_add(&rdev->list, ®ulator_list);
2979 rdev_init_debugfs(rdev);
2981 mutex_unlock(®ulator_list_mutex);
2985 unset_regulator_supplies(rdev);
2988 kfree(rdev->constraints);
2989 device_unregister(&rdev->dev);
2990 /* device core frees rdev */
2991 rdev = ERR_PTR(ret);
2996 rdev = ERR_PTR(ret);
2999 EXPORT_SYMBOL_GPL(regulator_register);
3002 * regulator_unregister - unregister regulator
3003 * @rdev: regulator to unregister
3005 * Called by regulator drivers to unregister a regulator.
3007 void regulator_unregister(struct regulator_dev *rdev)
3012 mutex_lock(®ulator_list_mutex);
3013 #ifdef CONFIG_DEBUG_FS
3014 debugfs_remove_recursive(rdev->debugfs);
3016 flush_work_sync(&rdev->disable_work.work);
3017 WARN_ON(rdev->open_count);
3018 unset_regulator_supplies(rdev);
3019 list_del(&rdev->list);
3021 regulator_put(rdev->supply);
3022 kfree(rdev->constraints);
3023 device_unregister(&rdev->dev);
3024 mutex_unlock(®ulator_list_mutex);
3026 EXPORT_SYMBOL_GPL(regulator_unregister);
3029 * regulator_suspend_prepare - prepare regulators for system wide suspend
3030 * @state: system suspend state
3032 * Configure each regulator with it's suspend operating parameters for state.
3033 * This will usually be called by machine suspend code prior to supending.
3035 int regulator_suspend_prepare(suspend_state_t state)
3037 struct regulator_dev *rdev;
3040 /* ON is handled by regulator active state */
3041 if (state == PM_SUSPEND_ON)
3044 mutex_lock(®ulator_list_mutex);
3045 list_for_each_entry(rdev, ®ulator_list, list) {
3047 mutex_lock(&rdev->mutex);
3048 ret = suspend_prepare(rdev, state);
3049 mutex_unlock(&rdev->mutex);
3052 rdev_err(rdev, "failed to prepare\n");
3057 mutex_unlock(®ulator_list_mutex);
3060 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3063 * regulator_suspend_finish - resume regulators from system wide suspend
3065 * Turn on regulators that might be turned off by regulator_suspend_prepare
3066 * and that should be turned on according to the regulators properties.
3068 int regulator_suspend_finish(void)
3070 struct regulator_dev *rdev;
3073 mutex_lock(®ulator_list_mutex);
3074 list_for_each_entry(rdev, ®ulator_list, list) {
3075 struct regulator_ops *ops = rdev->desc->ops;
3077 mutex_lock(&rdev->mutex);
3078 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3080 error = ops->enable(rdev);
3084 if (!has_full_constraints)
3088 if (ops->is_enabled && !ops->is_enabled(rdev))
3091 error = ops->disable(rdev);
3096 mutex_unlock(&rdev->mutex);
3098 mutex_unlock(®ulator_list_mutex);
3101 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3104 * regulator_has_full_constraints - the system has fully specified constraints
3106 * Calling this function will cause the regulator API to disable all
3107 * regulators which have a zero use count and don't have an always_on
3108 * constraint in a late_initcall.
3110 * The intention is that this will become the default behaviour in a
3111 * future kernel release so users are encouraged to use this facility
3114 void regulator_has_full_constraints(void)
3116 has_full_constraints = 1;
3118 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3121 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3123 * Calling this function will cause the regulator API to provide a
3124 * dummy regulator to consumers if no physical regulator is found,
3125 * allowing most consumers to proceed as though a regulator were
3126 * configured. This allows systems such as those with software
3127 * controllable regulators for the CPU core only to be brought up more
3130 void regulator_use_dummy_regulator(void)
3132 board_wants_dummy_regulator = true;
3134 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3137 * rdev_get_drvdata - get rdev regulator driver data
3140 * Get rdev regulator driver private data. This call can be used in the
3141 * regulator driver context.
3143 void *rdev_get_drvdata(struct regulator_dev *rdev)
3145 return rdev->reg_data;
3147 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3150 * regulator_get_drvdata - get regulator driver data
3151 * @regulator: regulator
3153 * Get regulator driver private data. This call can be used in the consumer
3154 * driver context when non API regulator specific functions need to be called.
3156 void *regulator_get_drvdata(struct regulator *regulator)
3158 return regulator->rdev->reg_data;
3160 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3163 * regulator_set_drvdata - set regulator driver data
3164 * @regulator: regulator
3167 void regulator_set_drvdata(struct regulator *regulator, void *data)
3169 regulator->rdev->reg_data = data;
3171 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3174 * regulator_get_id - get regulator ID
3177 int rdev_get_id(struct regulator_dev *rdev)
3179 return rdev->desc->id;
3181 EXPORT_SYMBOL_GPL(rdev_get_id);
3183 struct device *rdev_get_dev(struct regulator_dev *rdev)
3187 EXPORT_SYMBOL_GPL(rdev_get_dev);
3189 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3191 return reg_init_data->driver_data;
3193 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3195 #ifdef CONFIG_DEBUG_FS
3196 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3197 size_t count, loff_t *ppos)
3199 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3200 ssize_t len, ret = 0;
3201 struct regulator_map *map;
3206 list_for_each_entry(map, ®ulator_map_list, list) {
3207 len = snprintf(buf + ret, PAGE_SIZE - ret,
3209 rdev_get_name(map->regulator), map->dev_name,
3213 if (ret > PAGE_SIZE) {
3219 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3226 static const struct file_operations supply_map_fops = {
3227 .read = supply_map_read_file,
3228 .llseek = default_llseek,
3232 static int __init regulator_init(void)
3236 ret = class_register(®ulator_class);
3238 #ifdef CONFIG_DEBUG_FS
3239 debugfs_root = debugfs_create_dir("regulator", NULL);
3240 if (IS_ERR(debugfs_root) || !debugfs_root) {
3241 pr_warn("regulator: Failed to create debugfs directory\n");
3242 debugfs_root = NULL;
3245 if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root,
3246 NULL, &supply_map_fops)))
3247 pr_warn("regulator: Failed to create supplies debugfs\n");
3250 regulator_dummy_init();
3255 /* init early to allow our consumers to complete system booting */
3256 core_initcall(regulator_init);
3258 static int __init regulator_init_complete(void)
3260 struct regulator_dev *rdev;
3261 struct regulator_ops *ops;
3262 struct regulation_constraints *c;
3265 mutex_lock(®ulator_list_mutex);
3267 /* If we have a full configuration then disable any regulators
3268 * which are not in use or always_on. This will become the
3269 * default behaviour in the future.
3271 list_for_each_entry(rdev, ®ulator_list, list) {
3272 ops = rdev->desc->ops;
3273 c = rdev->constraints;
3275 if (!ops->disable || (c && c->always_on))
3278 mutex_lock(&rdev->mutex);
3280 if (rdev->use_count)
3283 /* If we can't read the status assume it's on. */
3284 if (ops->is_enabled)
3285 enabled = ops->is_enabled(rdev);
3292 if (has_full_constraints) {
3293 /* We log since this may kill the system if it
3295 rdev_info(rdev, "disabling\n");
3296 ret = ops->disable(rdev);
3298 rdev_err(rdev, "couldn't disable: %d\n", ret);
3301 /* The intention is that in future we will
3302 * assume that full constraints are provided
3303 * so warn even if we aren't going to do
3306 rdev_warn(rdev, "incomplete constraints, leaving on\n");
3310 mutex_unlock(&rdev->mutex);
3313 mutex_unlock(®ulator_list_mutex);
3317 late_initcall(regulator_init_complete);