2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
28 #include <linux/regmap.h>
29 #include <linux/regulator/of_regulator.h>
30 #include <linux/regulator/consumer.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/machine.h>
33 #include <linux/module.h>
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/regulator.h>
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 static struct dentry *debugfs_root;
60 * struct regulator_map
62 * Used to provide symbolic supply names to devices.
64 struct regulator_map {
65 struct list_head list;
66 const char *dev_name; /* The dev_name() for the consumer */
68 struct regulator_dev *regulator;
74 * One for each consumer device.
78 struct list_head list;
79 unsigned int always_on:1;
80 unsigned int bypass:1;
85 struct device_attribute dev_attr;
86 struct regulator_dev *rdev;
87 struct dentry *debugfs;
90 static int _regulator_is_enabled(struct regulator_dev *rdev);
91 static int _regulator_disable(struct regulator_dev *rdev);
92 static int _regulator_get_voltage(struct regulator_dev *rdev);
93 static int _regulator_get_current_limit(struct regulator_dev *rdev);
94 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
95 static void _notifier_call_chain(struct regulator_dev *rdev,
96 unsigned long event, void *data);
97 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
98 int min_uV, int max_uV);
99 static struct regulator *create_regulator(struct regulator_dev *rdev,
101 const char *supply_name);
103 static const char *rdev_get_name(struct regulator_dev *rdev)
105 if (rdev->constraints && rdev->constraints->name)
106 return rdev->constraints->name;
107 else if (rdev->desc->name)
108 return rdev->desc->name;
114 * of_get_regulator - get a regulator device node based on supply name
115 * @dev: Device pointer for the consumer (of regulator) device
116 * @supply: regulator supply name
118 * Extract the regulator device node corresponding to the supply name.
119 * retruns the device node corresponding to the regulator if found, else
122 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
124 struct device_node *regnode = NULL;
125 char prop_name[32]; /* 32 is max size of property name */
127 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
129 snprintf(prop_name, 32, "%s-supply", supply);
130 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
133 dev_dbg(dev, "Looking up %s property in node %s failed",
134 prop_name, dev->of_node->full_name);
140 static int _regulator_can_change_status(struct regulator_dev *rdev)
142 if (!rdev->constraints)
145 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
151 /* Platform voltage constraint check */
152 static int regulator_check_voltage(struct regulator_dev *rdev,
153 int *min_uV, int *max_uV)
155 BUG_ON(*min_uV > *max_uV);
157 if (!rdev->constraints) {
158 rdev_err(rdev, "no constraints\n");
161 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
162 rdev_err(rdev, "operation not allowed\n");
166 if (*max_uV > rdev->constraints->max_uV)
167 *max_uV = rdev->constraints->max_uV;
168 if (*min_uV < rdev->constraints->min_uV)
169 *min_uV = rdev->constraints->min_uV;
171 if (*min_uV > *max_uV) {
172 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
180 /* Make sure we select a voltage that suits the needs of all
181 * regulator consumers
183 static int regulator_check_consumers(struct regulator_dev *rdev,
184 int *min_uV, int *max_uV)
186 struct regulator *regulator;
188 list_for_each_entry(regulator, &rdev->consumer_list, list) {
190 * Assume consumers that didn't say anything are OK
191 * with anything in the constraint range.
193 if (!regulator->min_uV && !regulator->max_uV)
196 if (*max_uV > regulator->max_uV)
197 *max_uV = regulator->max_uV;
198 if (*min_uV < regulator->min_uV)
199 *min_uV = regulator->min_uV;
202 if (*min_uV > *max_uV) {
203 dev_err(regulator->dev, "Restricting voltage, %u-%uuV\n",
204 regulator->min_uV, regulator->max_uV);
211 /* current constraint check */
212 static int regulator_check_current_limit(struct regulator_dev *rdev,
213 int *min_uA, int *max_uA)
215 BUG_ON(*min_uA > *max_uA);
217 if (!rdev->constraints) {
218 rdev_err(rdev, "no constraints\n");
221 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
222 rdev_err(rdev, "operation not allowed\n");
226 if (*max_uA > rdev->constraints->max_uA)
227 *max_uA = rdev->constraints->max_uA;
228 if (*min_uA < rdev->constraints->min_uA)
229 *min_uA = rdev->constraints->min_uA;
231 if (*min_uA > *max_uA) {
232 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
240 /* operating mode constraint check */
241 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
244 case REGULATOR_MODE_FAST:
245 case REGULATOR_MODE_NORMAL:
246 case REGULATOR_MODE_IDLE:
247 case REGULATOR_MODE_STANDBY:
250 rdev_err(rdev, "invalid mode %x specified\n", *mode);
254 if (!rdev->constraints) {
255 rdev_err(rdev, "no constraints\n");
258 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
259 rdev_err(rdev, "operation not allowed\n");
263 /* The modes are bitmasks, the most power hungry modes having
264 * the lowest values. If the requested mode isn't supported
265 * try higher modes. */
267 if (rdev->constraints->valid_modes_mask & *mode)
275 /* dynamic regulator mode switching constraint check */
276 static int regulator_check_drms(struct regulator_dev *rdev)
278 if (!rdev->constraints) {
279 rdev_err(rdev, "no constraints\n");
282 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
283 rdev_err(rdev, "operation not allowed\n");
289 static ssize_t regulator_uV_show(struct device *dev,
290 struct device_attribute *attr, char *buf)
292 struct regulator_dev *rdev = dev_get_drvdata(dev);
295 mutex_lock(&rdev->mutex);
296 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
297 mutex_unlock(&rdev->mutex);
301 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
303 static ssize_t regulator_uA_show(struct device *dev,
304 struct device_attribute *attr, char *buf)
306 struct regulator_dev *rdev = dev_get_drvdata(dev);
308 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
310 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
312 static ssize_t regulator_name_show(struct device *dev,
313 struct device_attribute *attr, char *buf)
315 struct regulator_dev *rdev = dev_get_drvdata(dev);
317 return sprintf(buf, "%s\n", rdev_get_name(rdev));
320 static ssize_t regulator_print_opmode(char *buf, int mode)
323 case REGULATOR_MODE_FAST:
324 return sprintf(buf, "fast\n");
325 case REGULATOR_MODE_NORMAL:
326 return sprintf(buf, "normal\n");
327 case REGULATOR_MODE_IDLE:
328 return sprintf(buf, "idle\n");
329 case REGULATOR_MODE_STANDBY:
330 return sprintf(buf, "standby\n");
332 return sprintf(buf, "unknown\n");
335 static ssize_t regulator_opmode_show(struct device *dev,
336 struct device_attribute *attr, char *buf)
338 struct regulator_dev *rdev = dev_get_drvdata(dev);
340 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
342 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
344 static ssize_t regulator_print_state(char *buf, int state)
347 return sprintf(buf, "enabled\n");
349 return sprintf(buf, "disabled\n");
351 return sprintf(buf, "unknown\n");
354 static ssize_t regulator_state_show(struct device *dev,
355 struct device_attribute *attr, char *buf)
357 struct regulator_dev *rdev = dev_get_drvdata(dev);
360 mutex_lock(&rdev->mutex);
361 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
362 mutex_unlock(&rdev->mutex);
366 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
368 static ssize_t regulator_status_show(struct device *dev,
369 struct device_attribute *attr, char *buf)
371 struct regulator_dev *rdev = dev_get_drvdata(dev);
375 status = rdev->desc->ops->get_status(rdev);
380 case REGULATOR_STATUS_OFF:
383 case REGULATOR_STATUS_ON:
386 case REGULATOR_STATUS_ERROR:
389 case REGULATOR_STATUS_FAST:
392 case REGULATOR_STATUS_NORMAL:
395 case REGULATOR_STATUS_IDLE:
398 case REGULATOR_STATUS_STANDBY:
401 case REGULATOR_STATUS_BYPASS:
404 case REGULATOR_STATUS_UNDEFINED:
411 return sprintf(buf, "%s\n", label);
413 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
415 static ssize_t regulator_min_uA_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
418 struct regulator_dev *rdev = dev_get_drvdata(dev);
420 if (!rdev->constraints)
421 return sprintf(buf, "constraint not defined\n");
423 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
425 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
427 static ssize_t regulator_max_uA_show(struct device *dev,
428 struct device_attribute *attr, char *buf)
430 struct regulator_dev *rdev = dev_get_drvdata(dev);
432 if (!rdev->constraints)
433 return sprintf(buf, "constraint not defined\n");
435 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
437 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
439 static ssize_t regulator_min_uV_show(struct device *dev,
440 struct device_attribute *attr, char *buf)
442 struct regulator_dev *rdev = dev_get_drvdata(dev);
444 if (!rdev->constraints)
445 return sprintf(buf, "constraint not defined\n");
447 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
449 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
451 static ssize_t regulator_max_uV_show(struct device *dev,
452 struct device_attribute *attr, char *buf)
454 struct regulator_dev *rdev = dev_get_drvdata(dev);
456 if (!rdev->constraints)
457 return sprintf(buf, "constraint not defined\n");
459 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
461 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
463 static ssize_t regulator_total_uA_show(struct device *dev,
464 struct device_attribute *attr, char *buf)
466 struct regulator_dev *rdev = dev_get_drvdata(dev);
467 struct regulator *regulator;
470 mutex_lock(&rdev->mutex);
471 list_for_each_entry(regulator, &rdev->consumer_list, list)
472 uA += regulator->uA_load;
473 mutex_unlock(&rdev->mutex);
474 return sprintf(buf, "%d\n", uA);
476 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
478 static ssize_t regulator_num_users_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
481 struct regulator_dev *rdev = dev_get_drvdata(dev);
482 return sprintf(buf, "%d\n", rdev->use_count);
485 static ssize_t regulator_type_show(struct device *dev,
486 struct device_attribute *attr, char *buf)
488 struct regulator_dev *rdev = dev_get_drvdata(dev);
490 switch (rdev->desc->type) {
491 case REGULATOR_VOLTAGE:
492 return sprintf(buf, "voltage\n");
493 case REGULATOR_CURRENT:
494 return sprintf(buf, "current\n");
496 return sprintf(buf, "unknown\n");
499 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
500 struct device_attribute *attr, char *buf)
502 struct regulator_dev *rdev = dev_get_drvdata(dev);
504 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
506 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
507 regulator_suspend_mem_uV_show, NULL);
509 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
510 struct device_attribute *attr, char *buf)
512 struct regulator_dev *rdev = dev_get_drvdata(dev);
514 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
516 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
517 regulator_suspend_disk_uV_show, NULL);
519 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
520 struct device_attribute *attr, char *buf)
522 struct regulator_dev *rdev = dev_get_drvdata(dev);
524 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
526 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
527 regulator_suspend_standby_uV_show, NULL);
529 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
530 struct device_attribute *attr, char *buf)
532 struct regulator_dev *rdev = dev_get_drvdata(dev);
534 return regulator_print_opmode(buf,
535 rdev->constraints->state_mem.mode);
537 static DEVICE_ATTR(suspend_mem_mode, 0444,
538 regulator_suspend_mem_mode_show, NULL);
540 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
541 struct device_attribute *attr, char *buf)
543 struct regulator_dev *rdev = dev_get_drvdata(dev);
545 return regulator_print_opmode(buf,
546 rdev->constraints->state_disk.mode);
548 static DEVICE_ATTR(suspend_disk_mode, 0444,
549 regulator_suspend_disk_mode_show, NULL);
551 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
552 struct device_attribute *attr, char *buf)
554 struct regulator_dev *rdev = dev_get_drvdata(dev);
556 return regulator_print_opmode(buf,
557 rdev->constraints->state_standby.mode);
559 static DEVICE_ATTR(suspend_standby_mode, 0444,
560 regulator_suspend_standby_mode_show, NULL);
562 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
563 struct device_attribute *attr, char *buf)
565 struct regulator_dev *rdev = dev_get_drvdata(dev);
567 return regulator_print_state(buf,
568 rdev->constraints->state_mem.enabled);
570 static DEVICE_ATTR(suspend_mem_state, 0444,
571 regulator_suspend_mem_state_show, NULL);
573 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
574 struct device_attribute *attr, char *buf)
576 struct regulator_dev *rdev = dev_get_drvdata(dev);
578 return regulator_print_state(buf,
579 rdev->constraints->state_disk.enabled);
581 static DEVICE_ATTR(suspend_disk_state, 0444,
582 regulator_suspend_disk_state_show, NULL);
584 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
585 struct device_attribute *attr, char *buf)
587 struct regulator_dev *rdev = dev_get_drvdata(dev);
589 return regulator_print_state(buf,
590 rdev->constraints->state_standby.enabled);
592 static DEVICE_ATTR(suspend_standby_state, 0444,
593 regulator_suspend_standby_state_show, NULL);
595 static ssize_t regulator_bypass_show(struct device *dev,
596 struct device_attribute *attr, char *buf)
598 struct regulator_dev *rdev = dev_get_drvdata(dev);
603 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
612 return sprintf(buf, "%s\n", report);
614 static DEVICE_ATTR(bypass, 0444,
615 regulator_bypass_show, NULL);
618 * These are the only attributes are present for all regulators.
619 * Other attributes are a function of regulator functionality.
621 static struct device_attribute regulator_dev_attrs[] = {
622 __ATTR(name, 0444, regulator_name_show, NULL),
623 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
624 __ATTR(type, 0444, regulator_type_show, NULL),
628 static void regulator_dev_release(struct device *dev)
630 struct regulator_dev *rdev = dev_get_drvdata(dev);
634 static struct class regulator_class = {
636 .dev_release = regulator_dev_release,
637 .dev_attrs = regulator_dev_attrs,
640 /* Calculate the new optimum regulator operating mode based on the new total
641 * consumer load. All locks held by caller */
642 static void drms_uA_update(struct regulator_dev *rdev)
644 struct regulator *sibling;
645 int current_uA = 0, output_uV, input_uV, err;
648 err = regulator_check_drms(rdev);
649 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
650 (!rdev->desc->ops->get_voltage &&
651 !rdev->desc->ops->get_voltage_sel) ||
652 !rdev->desc->ops->set_mode)
655 /* get output voltage */
656 output_uV = _regulator_get_voltage(rdev);
660 /* get input voltage */
663 input_uV = regulator_get_voltage(rdev->supply);
665 input_uV = rdev->constraints->input_uV;
669 /* calc total requested load */
670 list_for_each_entry(sibling, &rdev->consumer_list, list)
671 current_uA += sibling->uA_load;
673 /* now get the optimum mode for our new total regulator load */
674 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
675 output_uV, current_uA);
677 /* check the new mode is allowed */
678 err = regulator_mode_constrain(rdev, &mode);
680 rdev->desc->ops->set_mode(rdev, mode);
683 static int suspend_set_state(struct regulator_dev *rdev,
684 struct regulator_state *rstate)
688 /* If we have no suspend mode configration don't set anything;
689 * only warn if the driver implements set_suspend_voltage or
690 * set_suspend_mode callback.
692 if (!rstate->enabled && !rstate->disabled) {
693 if (rdev->desc->ops->set_suspend_voltage ||
694 rdev->desc->ops->set_suspend_mode)
695 rdev_warn(rdev, "No configuration\n");
699 if (rstate->enabled && rstate->disabled) {
700 rdev_err(rdev, "invalid configuration\n");
704 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
705 ret = rdev->desc->ops->set_suspend_enable(rdev);
706 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
707 ret = rdev->desc->ops->set_suspend_disable(rdev);
708 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
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");
810 sprintf(buf, "no parameters");
812 rdev_info(rdev, "%s\n", buf);
814 if ((constraints->min_uV != constraints->max_uV) &&
815 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
817 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
820 static int machine_constraints_voltage(struct regulator_dev *rdev,
821 struct regulation_constraints *constraints)
823 struct regulator_ops *ops = rdev->desc->ops;
826 /* do we need to apply the constraint voltage */
827 if (rdev->constraints->apply_uV &&
828 rdev->constraints->min_uV == rdev->constraints->max_uV) {
829 ret = _regulator_do_set_voltage(rdev,
830 rdev->constraints->min_uV,
831 rdev->constraints->max_uV);
833 rdev_err(rdev, "failed to apply %duV constraint\n",
834 rdev->constraints->min_uV);
839 /* constrain machine-level voltage specs to fit
840 * the actual range supported by this regulator.
842 if (ops->list_voltage && rdev->desc->n_voltages) {
843 int count = rdev->desc->n_voltages;
845 int min_uV = INT_MAX;
846 int max_uV = INT_MIN;
847 int cmin = constraints->min_uV;
848 int cmax = constraints->max_uV;
850 /* it's safe to autoconfigure fixed-voltage supplies
851 and the constraints are used by list_voltage. */
852 if (count == 1 && !cmin) {
855 constraints->min_uV = cmin;
856 constraints->max_uV = cmax;
859 /* voltage constraints are optional */
860 if ((cmin == 0) && (cmax == 0))
863 /* else require explicit machine-level constraints */
864 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
865 rdev_err(rdev, "invalid voltage constraints\n");
869 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
870 for (i = 0; i < count; i++) {
873 value = ops->list_voltage(rdev, i);
877 /* maybe adjust [min_uV..max_uV] */
878 if (value >= cmin && value < min_uV)
880 if (value <= cmax && value > max_uV)
884 /* final: [min_uV..max_uV] valid iff constraints valid */
885 if (max_uV < min_uV) {
887 "unsupportable voltage constraints %u-%uuV\n",
892 /* use regulator's subset of machine constraints */
893 if (constraints->min_uV < min_uV) {
894 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
895 constraints->min_uV, min_uV);
896 constraints->min_uV = min_uV;
898 if (constraints->max_uV > max_uV) {
899 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
900 constraints->max_uV, max_uV);
901 constraints->max_uV = max_uV;
909 * set_machine_constraints - sets regulator constraints
910 * @rdev: regulator source
911 * @constraints: constraints to apply
913 * Allows platform initialisation code to define and constrain
914 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
915 * Constraints *must* be set by platform code in order for some
916 * regulator operations to proceed i.e. set_voltage, set_current_limit,
919 static int set_machine_constraints(struct regulator_dev *rdev,
920 const struct regulation_constraints *constraints)
923 struct regulator_ops *ops = rdev->desc->ops;
926 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
929 rdev->constraints = kzalloc(sizeof(*constraints),
931 if (!rdev->constraints)
934 ret = machine_constraints_voltage(rdev, rdev->constraints);
938 /* do we need to setup our suspend state */
939 if (rdev->constraints->initial_state) {
940 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
942 rdev_err(rdev, "failed to set suspend state\n");
947 if (rdev->constraints->initial_mode) {
948 if (!ops->set_mode) {
949 rdev_err(rdev, "no set_mode operation\n");
954 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
956 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
961 /* If the constraints say the regulator should be on at this point
962 * and we have control then make sure it is enabled.
964 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
966 ret = ops->enable(rdev);
968 rdev_err(rdev, "failed to enable\n");
973 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) {
974 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
976 rdev_err(rdev, "failed to set ramp_delay\n");
981 print_constraints(rdev);
984 kfree(rdev->constraints);
985 rdev->constraints = NULL;
990 * set_supply - set regulator supply regulator
991 * @rdev: regulator name
992 * @supply_rdev: supply regulator name
994 * Called by platform initialisation code to set the supply regulator for this
995 * regulator. This ensures that a regulators supply will also be enabled by the
996 * core if it's child is enabled.
998 static int set_supply(struct regulator_dev *rdev,
999 struct regulator_dev *supply_rdev)
1003 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1005 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1006 if (rdev->supply == NULL) {
1010 supply_rdev->open_count++;
1016 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1017 * @rdev: regulator source
1018 * @consumer_dev_name: dev_name() string for device supply applies to
1019 * @supply: symbolic name for supply
1021 * Allows platform initialisation code to map physical regulator
1022 * sources to symbolic names for supplies for use by devices. Devices
1023 * should use these symbolic names to request regulators, avoiding the
1024 * need to provide board-specific regulator names as platform data.
1026 static int set_consumer_device_supply(struct regulator_dev *rdev,
1027 const char *consumer_dev_name,
1030 struct regulator_map *node;
1036 if (consumer_dev_name != NULL)
1041 list_for_each_entry(node, ®ulator_map_list, list) {
1042 if (node->dev_name && consumer_dev_name) {
1043 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1045 } else if (node->dev_name || consumer_dev_name) {
1049 if (strcmp(node->supply, supply) != 0)
1052 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1054 dev_name(&node->regulator->dev),
1055 node->regulator->desc->name,
1057 dev_name(&rdev->dev), rdev_get_name(rdev));
1061 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1065 node->regulator = rdev;
1066 node->supply = supply;
1069 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1070 if (node->dev_name == NULL) {
1076 list_add(&node->list, ®ulator_map_list);
1080 static void unset_regulator_supplies(struct regulator_dev *rdev)
1082 struct regulator_map *node, *n;
1084 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1085 if (rdev == node->regulator) {
1086 list_del(&node->list);
1087 kfree(node->dev_name);
1093 #define REG_STR_SIZE 64
1095 static struct regulator *create_regulator(struct regulator_dev *rdev,
1097 const char *supply_name)
1099 struct regulator *regulator;
1100 char buf[REG_STR_SIZE];
1103 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1104 if (regulator == NULL)
1107 mutex_lock(&rdev->mutex);
1108 regulator->rdev = rdev;
1109 list_add(®ulator->list, &rdev->consumer_list);
1112 regulator->dev = dev;
1114 /* Add a link to the device sysfs entry */
1115 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1116 dev->kobj.name, supply_name);
1117 if (size >= REG_STR_SIZE)
1120 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1121 if (regulator->supply_name == NULL)
1124 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1127 rdev_warn(rdev, "could not add device link %s err %d\n",
1128 dev->kobj.name, err);
1132 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1133 if (regulator->supply_name == NULL)
1137 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1139 if (!regulator->debugfs) {
1140 rdev_warn(rdev, "Failed to create debugfs directory\n");
1142 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1143 ®ulator->uA_load);
1144 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1145 ®ulator->min_uV);
1146 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1147 ®ulator->max_uV);
1151 * Check now if the regulator is an always on regulator - if
1152 * it is then we don't need to do nearly so much work for
1153 * enable/disable calls.
1155 if (!_regulator_can_change_status(rdev) &&
1156 _regulator_is_enabled(rdev))
1157 regulator->always_on = true;
1159 mutex_unlock(&rdev->mutex);
1162 list_del(®ulator->list);
1164 mutex_unlock(&rdev->mutex);
1168 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1170 if (!rdev->desc->ops->enable_time)
1171 return rdev->desc->enable_time;
1172 return rdev->desc->ops->enable_time(rdev);
1175 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1179 struct regulator_dev *r;
1180 struct device_node *node;
1181 struct regulator_map *map;
1182 const char *devname = NULL;
1184 /* first do a dt based lookup */
1185 if (dev && dev->of_node) {
1186 node = of_get_regulator(dev, supply);
1188 list_for_each_entry(r, ®ulator_list, list)
1189 if (r->dev.parent &&
1190 node == r->dev.of_node)
1194 * If we couldn't even get the node then it's
1195 * not just that the device didn't register
1196 * yet, there's no node and we'll never
1203 /* if not found, try doing it non-dt way */
1205 devname = dev_name(dev);
1207 list_for_each_entry(r, ®ulator_list, list)
1208 if (strcmp(rdev_get_name(r), supply) == 0)
1211 list_for_each_entry(map, ®ulator_map_list, list) {
1212 /* If the mapping has a device set up it must match */
1213 if (map->dev_name &&
1214 (!devname || strcmp(map->dev_name, devname)))
1217 if (strcmp(map->supply, supply) == 0)
1218 return map->regulator;
1225 /* Internal regulator request function */
1226 static struct regulator *_regulator_get(struct device *dev, const char *id,
1229 struct regulator_dev *rdev;
1230 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1231 const char *devname = NULL;
1235 pr_err("get() with no identifier\n");
1240 devname = dev_name(dev);
1242 mutex_lock(®ulator_list_mutex);
1244 rdev = regulator_dev_lookup(dev, id, &ret);
1248 if (board_wants_dummy_regulator) {
1249 rdev = dummy_regulator_rdev;
1253 #ifdef CONFIG_REGULATOR_DUMMY
1255 devname = "deviceless";
1257 /* If the board didn't flag that it was fully constrained then
1258 * substitute in a dummy regulator so consumers can continue.
1260 if (!has_full_constraints) {
1261 pr_warn("%s supply %s not found, using dummy regulator\n",
1263 rdev = dummy_regulator_rdev;
1268 mutex_unlock(®ulator_list_mutex);
1272 if (rdev->exclusive) {
1273 regulator = ERR_PTR(-EPERM);
1277 if (exclusive && rdev->open_count) {
1278 regulator = ERR_PTR(-EBUSY);
1282 if (!try_module_get(rdev->owner))
1285 regulator = create_regulator(rdev, dev, id);
1286 if (regulator == NULL) {
1287 regulator = ERR_PTR(-ENOMEM);
1288 module_put(rdev->owner);
1294 rdev->exclusive = 1;
1296 ret = _regulator_is_enabled(rdev);
1298 rdev->use_count = 1;
1300 rdev->use_count = 0;
1304 mutex_unlock(®ulator_list_mutex);
1310 * regulator_get - lookup and obtain a reference to a regulator.
1311 * @dev: device for regulator "consumer"
1312 * @id: Supply name or regulator ID.
1314 * Returns a struct regulator corresponding to the regulator producer,
1315 * or IS_ERR() condition containing errno.
1317 * Use of supply names configured via regulator_set_device_supply() is
1318 * strongly encouraged. It is recommended that the supply name used
1319 * should match the name used for the supply and/or the relevant
1320 * device pins in the datasheet.
1322 struct regulator *regulator_get(struct device *dev, const char *id)
1324 return _regulator_get(dev, id, 0);
1326 EXPORT_SYMBOL_GPL(regulator_get);
1328 static void devm_regulator_release(struct device *dev, void *res)
1330 regulator_put(*(struct regulator **)res);
1334 * devm_regulator_get - Resource managed regulator_get()
1335 * @dev: device for regulator "consumer"
1336 * @id: Supply name or regulator ID.
1338 * Managed regulator_get(). Regulators returned from this function are
1339 * automatically regulator_put() on driver detach. See regulator_get() for more
1342 struct regulator *devm_regulator_get(struct device *dev, const char *id)
1344 struct regulator **ptr, *regulator;
1346 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1348 return ERR_PTR(-ENOMEM);
1350 regulator = regulator_get(dev, id);
1351 if (!IS_ERR(regulator)) {
1353 devres_add(dev, ptr);
1360 EXPORT_SYMBOL_GPL(devm_regulator_get);
1363 * regulator_get_exclusive - obtain exclusive access to a regulator.
1364 * @dev: device for regulator "consumer"
1365 * @id: Supply name or regulator ID.
1367 * Returns a struct regulator corresponding to the regulator producer,
1368 * or IS_ERR() condition containing errno. Other consumers will be
1369 * unable to obtain this reference is held and the use count for the
1370 * regulator will be initialised to reflect the current state of the
1373 * This is intended for use by consumers which cannot tolerate shared
1374 * use of the regulator such as those which need to force the
1375 * regulator off for correct operation of the hardware they are
1378 * Use of supply names configured via regulator_set_device_supply() is
1379 * strongly encouraged. It is recommended that the supply name used
1380 * should match the name used for the supply and/or the relevant
1381 * device pins in the datasheet.
1383 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1385 return _regulator_get(dev, id, 1);
1387 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1389 /* Locks held by regulator_put() */
1390 static void _regulator_put(struct regulator *regulator)
1392 struct regulator_dev *rdev;
1394 if (regulator == NULL || IS_ERR(regulator))
1397 rdev = regulator->rdev;
1399 debugfs_remove_recursive(regulator->debugfs);
1401 /* remove any sysfs entries */
1403 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1404 kfree(regulator->supply_name);
1405 list_del(®ulator->list);
1409 rdev->exclusive = 0;
1411 module_put(rdev->owner);
1415 * regulator_put - "free" the regulator source
1416 * @regulator: regulator source
1418 * Note: drivers must ensure that all regulator_enable calls made on this
1419 * regulator source are balanced by regulator_disable calls prior to calling
1422 void regulator_put(struct regulator *regulator)
1424 mutex_lock(®ulator_list_mutex);
1425 _regulator_put(regulator);
1426 mutex_unlock(®ulator_list_mutex);
1428 EXPORT_SYMBOL_GPL(regulator_put);
1430 static int devm_regulator_match(struct device *dev, void *res, void *data)
1432 struct regulator **r = res;
1441 * devm_regulator_put - Resource managed regulator_put()
1442 * @regulator: regulator to free
1444 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1445 * this function will not need to be called and the resource management
1446 * code will ensure that the resource is freed.
1448 void devm_regulator_put(struct regulator *regulator)
1452 rc = devres_release(regulator->dev, devm_regulator_release,
1453 devm_regulator_match, regulator);
1457 EXPORT_SYMBOL_GPL(devm_regulator_put);
1459 static int _regulator_do_enable(struct regulator_dev *rdev)
1463 /* Query before enabling in case configuration dependent. */
1464 ret = _regulator_get_enable_time(rdev);
1468 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1472 trace_regulator_enable(rdev_get_name(rdev));
1474 if (rdev->ena_gpio) {
1475 gpio_set_value_cansleep(rdev->ena_gpio,
1476 !rdev->ena_gpio_invert);
1477 rdev->ena_gpio_state = 1;
1478 } else if (rdev->desc->ops->enable) {
1479 ret = rdev->desc->ops->enable(rdev);
1486 /* Allow the regulator to ramp; it would be useful to extend
1487 * this for bulk operations so that the regulators can ramp
1489 trace_regulator_enable_delay(rdev_get_name(rdev));
1491 if (delay >= 1000) {
1492 mdelay(delay / 1000);
1493 udelay(delay % 1000);
1498 trace_regulator_enable_complete(rdev_get_name(rdev));
1503 /* locks held by regulator_enable() */
1504 static int _regulator_enable(struct regulator_dev *rdev)
1508 /* check voltage and requested load before enabling */
1509 if (rdev->constraints &&
1510 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1511 drms_uA_update(rdev);
1513 if (rdev->use_count == 0) {
1514 /* The regulator may on if it's not switchable or left on */
1515 ret = _regulator_is_enabled(rdev);
1516 if (ret == -EINVAL || ret == 0) {
1517 if (!_regulator_can_change_status(rdev))
1520 ret = _regulator_do_enable(rdev);
1524 } else if (ret < 0) {
1525 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1528 /* Fallthrough on positive return values - already enabled */
1537 * regulator_enable - enable regulator output
1538 * @regulator: regulator source
1540 * Request that the regulator be enabled with the regulator output at
1541 * the predefined voltage or current value. Calls to regulator_enable()
1542 * must be balanced with calls to regulator_disable().
1544 * NOTE: the output value can be set by other drivers, boot loader or may be
1545 * hardwired in the regulator.
1547 int regulator_enable(struct regulator *regulator)
1549 struct regulator_dev *rdev = regulator->rdev;
1552 if (regulator->always_on)
1556 ret = regulator_enable(rdev->supply);
1561 mutex_lock(&rdev->mutex);
1562 ret = _regulator_enable(rdev);
1563 mutex_unlock(&rdev->mutex);
1565 if (ret != 0 && rdev->supply)
1566 regulator_disable(rdev->supply);
1570 EXPORT_SYMBOL_GPL(regulator_enable);
1572 static int _regulator_do_disable(struct regulator_dev *rdev)
1576 trace_regulator_disable(rdev_get_name(rdev));
1578 if (rdev->ena_gpio) {
1579 gpio_set_value_cansleep(rdev->ena_gpio,
1580 rdev->ena_gpio_invert);
1581 rdev->ena_gpio_state = 0;
1583 } else if (rdev->desc->ops->disable) {
1584 ret = rdev->desc->ops->disable(rdev);
1589 trace_regulator_disable_complete(rdev_get_name(rdev));
1591 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1596 /* locks held by regulator_disable() */
1597 static int _regulator_disable(struct regulator_dev *rdev)
1601 if (WARN(rdev->use_count <= 0,
1602 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1605 /* are we the last user and permitted to disable ? */
1606 if (rdev->use_count == 1 &&
1607 (rdev->constraints && !rdev->constraints->always_on)) {
1609 /* we are last user */
1610 if (_regulator_can_change_status(rdev)) {
1611 ret = _regulator_do_disable(rdev);
1613 rdev_err(rdev, "failed to disable\n");
1618 rdev->use_count = 0;
1619 } else if (rdev->use_count > 1) {
1621 if (rdev->constraints &&
1622 (rdev->constraints->valid_ops_mask &
1623 REGULATOR_CHANGE_DRMS))
1624 drms_uA_update(rdev);
1633 * regulator_disable - disable regulator output
1634 * @regulator: regulator source
1636 * Disable the regulator output voltage or current. Calls to
1637 * regulator_enable() must be balanced with calls to
1638 * regulator_disable().
1640 * NOTE: this will only disable the regulator output if no other consumer
1641 * devices have it enabled, the regulator device supports disabling and
1642 * machine constraints permit this operation.
1644 int regulator_disable(struct regulator *regulator)
1646 struct regulator_dev *rdev = regulator->rdev;
1649 if (regulator->always_on)
1652 mutex_lock(&rdev->mutex);
1653 ret = _regulator_disable(rdev);
1654 mutex_unlock(&rdev->mutex);
1656 if (ret == 0 && rdev->supply)
1657 regulator_disable(rdev->supply);
1661 EXPORT_SYMBOL_GPL(regulator_disable);
1663 /* locks held by regulator_force_disable() */
1664 static int _regulator_force_disable(struct regulator_dev *rdev)
1669 if (rdev->desc->ops->disable) {
1670 /* ah well, who wants to live forever... */
1671 ret = rdev->desc->ops->disable(rdev);
1673 rdev_err(rdev, "failed to force disable\n");
1676 /* notify other consumers that power has been forced off */
1677 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1678 REGULATOR_EVENT_DISABLE, NULL);
1685 * regulator_force_disable - force disable regulator output
1686 * @regulator: regulator source
1688 * Forcibly disable the regulator output voltage or current.
1689 * NOTE: this *will* disable the regulator output even if other consumer
1690 * devices have it enabled. This should be used for situations when device
1691 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1693 int regulator_force_disable(struct regulator *regulator)
1695 struct regulator_dev *rdev = regulator->rdev;
1698 mutex_lock(&rdev->mutex);
1699 regulator->uA_load = 0;
1700 ret = _regulator_force_disable(regulator->rdev);
1701 mutex_unlock(&rdev->mutex);
1704 while (rdev->open_count--)
1705 regulator_disable(rdev->supply);
1709 EXPORT_SYMBOL_GPL(regulator_force_disable);
1711 static void regulator_disable_work(struct work_struct *work)
1713 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1717 mutex_lock(&rdev->mutex);
1719 BUG_ON(!rdev->deferred_disables);
1721 count = rdev->deferred_disables;
1722 rdev->deferred_disables = 0;
1724 for (i = 0; i < count; i++) {
1725 ret = _regulator_disable(rdev);
1727 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1730 mutex_unlock(&rdev->mutex);
1733 for (i = 0; i < count; i++) {
1734 ret = regulator_disable(rdev->supply);
1737 "Supply disable failed: %d\n", ret);
1744 * regulator_disable_deferred - disable regulator output with delay
1745 * @regulator: regulator source
1746 * @ms: miliseconds until the regulator is disabled
1748 * Execute regulator_disable() on the regulator after a delay. This
1749 * is intended for use with devices that require some time to quiesce.
1751 * NOTE: this will only disable the regulator output if no other consumer
1752 * devices have it enabled, the regulator device supports disabling and
1753 * machine constraints permit this operation.
1755 int regulator_disable_deferred(struct regulator *regulator, int ms)
1757 struct regulator_dev *rdev = regulator->rdev;
1760 if (regulator->always_on)
1764 return regulator_disable(regulator);
1766 mutex_lock(&rdev->mutex);
1767 rdev->deferred_disables++;
1768 mutex_unlock(&rdev->mutex);
1770 ret = schedule_delayed_work(&rdev->disable_work,
1771 msecs_to_jiffies(ms));
1777 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1780 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1782 * @rdev: regulator to operate on
1784 * Regulators that use regmap for their register I/O can set the
1785 * enable_reg and enable_mask fields in their descriptor and then use
1786 * this as their is_enabled operation, saving some code.
1788 int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1793 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1797 return (val & rdev->desc->enable_mask) != 0;
1799 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1802 * regulator_enable_regmap - standard enable() for regmap users
1804 * @rdev: regulator to operate on
1806 * Regulators that use regmap for their register I/O can set the
1807 * enable_reg and enable_mask fields in their descriptor and then use
1808 * this as their enable() operation, saving some code.
1810 int regulator_enable_regmap(struct regulator_dev *rdev)
1812 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1813 rdev->desc->enable_mask,
1814 rdev->desc->enable_mask);
1816 EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1819 * regulator_disable_regmap - standard disable() for regmap users
1821 * @rdev: regulator to operate on
1823 * Regulators that use regmap for their register I/O can set the
1824 * enable_reg and enable_mask fields in their descriptor and then use
1825 * this as their disable() operation, saving some code.
1827 int regulator_disable_regmap(struct regulator_dev *rdev)
1829 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1830 rdev->desc->enable_mask, 0);
1832 EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1834 static int _regulator_is_enabled(struct regulator_dev *rdev)
1836 /* A GPIO control always takes precedence */
1838 return rdev->ena_gpio_state;
1840 /* If we don't know then assume that the regulator is always on */
1841 if (!rdev->desc->ops->is_enabled)
1844 return rdev->desc->ops->is_enabled(rdev);
1848 * regulator_is_enabled - is the regulator output enabled
1849 * @regulator: regulator source
1851 * Returns positive if the regulator driver backing the source/client
1852 * has requested that the device be enabled, zero if it hasn't, else a
1853 * negative errno code.
1855 * Note that the device backing this regulator handle can have multiple
1856 * users, so it might be enabled even if regulator_enable() was never
1857 * called for this particular source.
1859 int regulator_is_enabled(struct regulator *regulator)
1863 if (regulator->always_on)
1866 mutex_lock(®ulator->rdev->mutex);
1867 ret = _regulator_is_enabled(regulator->rdev);
1868 mutex_unlock(®ulator->rdev->mutex);
1872 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1875 * regulator_can_change_voltage - check if regulator can change voltage
1876 * @regulator: regulator source
1878 * Returns positive if the regulator driver backing the source/client
1879 * can change its voltage, false otherwise. Usefull for detecting fixed
1880 * or dummy regulators and disabling voltage change logic in the client
1883 int regulator_can_change_voltage(struct regulator *regulator)
1885 struct regulator_dev *rdev = regulator->rdev;
1887 if (rdev->constraints &&
1888 rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE &&
1889 rdev->desc->n_voltages > 1)
1894 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
1897 * regulator_count_voltages - count regulator_list_voltage() selectors
1898 * @regulator: regulator source
1900 * Returns number of selectors, or negative errno. Selectors are
1901 * numbered starting at zero, and typically correspond to bitfields
1902 * in hardware registers.
1904 int regulator_count_voltages(struct regulator *regulator)
1906 struct regulator_dev *rdev = regulator->rdev;
1908 return rdev->desc->n_voltages ? : -EINVAL;
1910 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1913 * regulator_list_voltage_linear - List voltages with simple calculation
1915 * @rdev: Regulator device
1916 * @selector: Selector to convert into a voltage
1918 * Regulators with a simple linear mapping between voltages and
1919 * selectors can set min_uV and uV_step in the regulator descriptor
1920 * and then use this function as their list_voltage() operation,
1922 int regulator_list_voltage_linear(struct regulator_dev *rdev,
1923 unsigned int selector)
1925 if (selector >= rdev->desc->n_voltages)
1928 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
1930 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
1933 * regulator_list_voltage_table - List voltages with table based mapping
1935 * @rdev: Regulator device
1936 * @selector: Selector to convert into a voltage
1938 * Regulators with table based mapping between voltages and
1939 * selectors can set volt_table in the regulator descriptor
1940 * and then use this function as their list_voltage() operation.
1942 int regulator_list_voltage_table(struct regulator_dev *rdev,
1943 unsigned int selector)
1945 if (!rdev->desc->volt_table) {
1946 BUG_ON(!rdev->desc->volt_table);
1950 if (selector >= rdev->desc->n_voltages)
1953 return rdev->desc->volt_table[selector];
1955 EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
1958 * regulator_list_voltage - enumerate supported voltages
1959 * @regulator: regulator source
1960 * @selector: identify voltage to list
1961 * Context: can sleep
1963 * Returns a voltage that can be passed to @regulator_set_voltage(),
1964 * zero if this selector code can't be used on this system, or a
1967 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1969 struct regulator_dev *rdev = regulator->rdev;
1970 struct regulator_ops *ops = rdev->desc->ops;
1973 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1976 mutex_lock(&rdev->mutex);
1977 ret = ops->list_voltage(rdev, selector);
1978 mutex_unlock(&rdev->mutex);
1981 if (ret < rdev->constraints->min_uV)
1983 else if (ret > rdev->constraints->max_uV)
1989 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1992 * regulator_is_supported_voltage - check if a voltage range can be supported
1994 * @regulator: Regulator to check.
1995 * @min_uV: Minimum required voltage in uV.
1996 * @max_uV: Maximum required voltage in uV.
1998 * Returns a boolean or a negative error code.
2000 int regulator_is_supported_voltage(struct regulator *regulator,
2001 int min_uV, int max_uV)
2003 struct regulator_dev *rdev = regulator->rdev;
2004 int i, voltages, ret;
2006 /* If we can't change voltage check the current voltage */
2007 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2008 ret = regulator_get_voltage(regulator);
2010 return (min_uV <= ret && ret <= max_uV);
2015 /* Any voltage within constrains range is fine? */
2016 if (rdev->desc->continuous_voltage_range)
2017 return min_uV >= rdev->constraints->min_uV &&
2018 max_uV <= rdev->constraints->max_uV;
2020 ret = regulator_count_voltages(regulator);
2025 for (i = 0; i < voltages; i++) {
2026 ret = regulator_list_voltage(regulator, i);
2028 if (ret >= min_uV && ret <= max_uV)
2034 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2037 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2039 * @rdev: regulator to operate on
2041 * Regulators that use regmap for their register I/O can set the
2042 * vsel_reg and vsel_mask fields in their descriptor and then use this
2043 * as their get_voltage_vsel operation, saving some code.
2045 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
2050 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
2054 val &= rdev->desc->vsel_mask;
2055 val >>= ffs(rdev->desc->vsel_mask) - 1;
2059 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
2062 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2064 * @rdev: regulator to operate on
2065 * @sel: Selector to set
2067 * Regulators that use regmap for their register I/O can set the
2068 * vsel_reg and vsel_mask fields in their descriptor and then use this
2069 * as their set_voltage_vsel operation, saving some code.
2071 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
2073 sel <<= ffs(rdev->desc->vsel_mask) - 1;
2075 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
2076 rdev->desc->vsel_mask, sel);
2078 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
2081 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2083 * @rdev: Regulator to operate on
2084 * @min_uV: Lower bound for voltage
2085 * @max_uV: Upper bound for voltage
2087 * Drivers implementing set_voltage_sel() and list_voltage() can use
2088 * this as their map_voltage() operation. It will find a suitable
2089 * voltage by calling list_voltage() until it gets something in bounds
2090 * for the requested voltages.
2092 int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2093 int min_uV, int max_uV)
2095 int best_val = INT_MAX;
2099 /* Find the smallest voltage that falls within the specified
2102 for (i = 0; i < rdev->desc->n_voltages; i++) {
2103 ret = rdev->desc->ops->list_voltage(rdev, i);
2107 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2113 if (best_val != INT_MAX)
2118 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2121 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2123 * @rdev: Regulator to operate on
2124 * @min_uV: Lower bound for voltage
2125 * @max_uV: Upper bound for voltage
2127 * Drivers providing min_uV and uV_step in their regulator_desc can
2128 * use this as their map_voltage() operation.
2130 int regulator_map_voltage_linear(struct regulator_dev *rdev,
2131 int min_uV, int max_uV)
2135 /* Allow uV_step to be 0 for fixed voltage */
2136 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
2137 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
2143 if (!rdev->desc->uV_step) {
2144 BUG_ON(!rdev->desc->uV_step);
2148 if (min_uV < rdev->desc->min_uV)
2149 min_uV = rdev->desc->min_uV;
2151 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
2155 /* Map back into a voltage to verify we're still in bounds */
2156 voltage = rdev->desc->ops->list_voltage(rdev, ret);
2157 if (voltage < min_uV || voltage > max_uV)
2162 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2164 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2165 int min_uV, int max_uV)
2170 unsigned int selector;
2171 int old_selector = -1;
2173 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2175 min_uV += rdev->constraints->uV_offset;
2176 max_uV += rdev->constraints->uV_offset;
2179 * If we can't obtain the old selector there is not enough
2180 * info to call set_voltage_time_sel().
2182 if (_regulator_is_enabled(rdev) &&
2183 rdev->desc->ops->set_voltage_time_sel &&
2184 rdev->desc->ops->get_voltage_sel) {
2185 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2186 if (old_selector < 0)
2187 return old_selector;
2190 if (rdev->desc->ops->set_voltage) {
2191 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2195 if (rdev->desc->ops->list_voltage)
2196 best_val = rdev->desc->ops->list_voltage(rdev,
2199 best_val = _regulator_get_voltage(rdev);
2202 } else if (rdev->desc->ops->set_voltage_sel) {
2203 if (rdev->desc->ops->map_voltage) {
2204 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2207 if (rdev->desc->ops->list_voltage ==
2208 regulator_list_voltage_linear)
2209 ret = regulator_map_voltage_linear(rdev,
2212 ret = regulator_map_voltage_iterate(rdev,
2217 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2218 if (min_uV <= best_val && max_uV >= best_val) {
2220 ret = rdev->desc->ops->set_voltage_sel(rdev,
2230 /* Call set_voltage_time_sel if successfully obtained old_selector */
2231 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
2232 rdev->desc->ops->set_voltage_time_sel) {
2234 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2235 old_selector, selector);
2237 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2242 /* Insert any necessary delays */
2243 if (delay >= 1000) {
2244 mdelay(delay / 1000);
2245 udelay(delay % 1000);
2251 if (ret == 0 && best_val >= 0) {
2252 unsigned long data = best_val;
2254 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2258 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2264 * regulator_set_voltage - set regulator output voltage
2265 * @regulator: regulator source
2266 * @min_uV: Minimum required voltage in uV
2267 * @max_uV: Maximum acceptable voltage in uV
2269 * Sets a voltage regulator to the desired output voltage. This can be set
2270 * during any regulator state. IOW, regulator can be disabled or enabled.
2272 * If the regulator is enabled then the voltage will change to the new value
2273 * immediately otherwise if the regulator is disabled the regulator will
2274 * output at the new voltage when enabled.
2276 * NOTE: If the regulator is shared between several devices then the lowest
2277 * request voltage that meets the system constraints will be used.
2278 * Regulator system constraints must be set for this regulator before
2279 * calling this function otherwise this call will fail.
2281 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2283 struct regulator_dev *rdev = regulator->rdev;
2286 mutex_lock(&rdev->mutex);
2288 /* If we're setting the same range as last time the change
2289 * should be a noop (some cpufreq implementations use the same
2290 * voltage for multiple frequencies, for example).
2292 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2296 if (!rdev->desc->ops->set_voltage &&
2297 !rdev->desc->ops->set_voltage_sel) {
2302 /* constraints check */
2303 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2306 regulator->min_uV = min_uV;
2307 regulator->max_uV = max_uV;
2309 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2313 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2316 mutex_unlock(&rdev->mutex);
2319 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2322 * regulator_set_voltage_time - get raise/fall time
2323 * @regulator: regulator source
2324 * @old_uV: starting voltage in microvolts
2325 * @new_uV: target voltage in microvolts
2327 * Provided with the starting and ending voltage, this function attempts to
2328 * calculate the time in microseconds required to rise or fall to this new
2331 int regulator_set_voltage_time(struct regulator *regulator,
2332 int old_uV, int new_uV)
2334 struct regulator_dev *rdev = regulator->rdev;
2335 struct regulator_ops *ops = rdev->desc->ops;
2341 /* Currently requires operations to do this */
2342 if (!ops->list_voltage || !ops->set_voltage_time_sel
2343 || !rdev->desc->n_voltages)
2346 for (i = 0; i < rdev->desc->n_voltages; i++) {
2347 /* We only look for exact voltage matches here */
2348 voltage = regulator_list_voltage(regulator, i);
2353 if (voltage == old_uV)
2355 if (voltage == new_uV)
2359 if (old_sel < 0 || new_sel < 0)
2362 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2364 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2367 * regulator_set_voltage_time_sel - get raise/fall time
2368 * @rdev: regulator source device
2369 * @old_selector: selector for starting voltage
2370 * @new_selector: selector for target voltage
2372 * Provided with the starting and target voltage selectors, this function
2373 * returns time in microseconds required to rise or fall to this new voltage
2375 * Drivers providing ramp_delay in regulation_constraints can use this as their
2376 * set_voltage_time_sel() operation.
2378 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2379 unsigned int old_selector,
2380 unsigned int new_selector)
2382 unsigned int ramp_delay = 0;
2383 int old_volt, new_volt;
2385 if (rdev->constraints->ramp_delay)
2386 ramp_delay = rdev->constraints->ramp_delay;
2387 else if (rdev->desc->ramp_delay)
2388 ramp_delay = rdev->desc->ramp_delay;
2390 if (ramp_delay == 0) {
2391 rdev_warn(rdev, "ramp_delay not set\n");
2396 if (!rdev->desc->ops->list_voltage)
2399 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2400 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2402 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2404 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2407 * regulator_sync_voltage - re-apply last regulator output voltage
2408 * @regulator: regulator source
2410 * Re-apply the last configured voltage. This is intended to be used
2411 * where some external control source the consumer is cooperating with
2412 * has caused the configured voltage to change.
2414 int regulator_sync_voltage(struct regulator *regulator)
2416 struct regulator_dev *rdev = regulator->rdev;
2417 int ret, min_uV, max_uV;
2419 mutex_lock(&rdev->mutex);
2421 if (!rdev->desc->ops->set_voltage &&
2422 !rdev->desc->ops->set_voltage_sel) {
2427 /* This is only going to work if we've had a voltage configured. */
2428 if (!regulator->min_uV && !regulator->max_uV) {
2433 min_uV = regulator->min_uV;
2434 max_uV = regulator->max_uV;
2436 /* This should be a paranoia check... */
2437 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2441 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2445 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2448 mutex_unlock(&rdev->mutex);
2451 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2453 static int _regulator_get_voltage(struct regulator_dev *rdev)
2457 if (rdev->desc->ops->get_voltage_sel) {
2458 sel = rdev->desc->ops->get_voltage_sel(rdev);
2461 ret = rdev->desc->ops->list_voltage(rdev, sel);
2462 } else if (rdev->desc->ops->get_voltage) {
2463 ret = rdev->desc->ops->get_voltage(rdev);
2464 } else if (rdev->desc->ops->list_voltage) {
2465 ret = rdev->desc->ops->list_voltage(rdev, 0);
2472 return ret - rdev->constraints->uV_offset;
2476 * regulator_get_voltage - get regulator output voltage
2477 * @regulator: regulator source
2479 * This returns the current regulator voltage in uV.
2481 * NOTE: If the regulator is disabled it will return the voltage value. This
2482 * function should not be used to determine regulator state.
2484 int regulator_get_voltage(struct regulator *regulator)
2488 mutex_lock(®ulator->rdev->mutex);
2490 ret = _regulator_get_voltage(regulator->rdev);
2492 mutex_unlock(®ulator->rdev->mutex);
2496 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2499 * regulator_set_current_limit - set regulator output current limit
2500 * @regulator: regulator source
2501 * @min_uA: Minimuum supported current in uA
2502 * @max_uA: Maximum supported current in uA
2504 * Sets current sink to the desired output current. This can be set during
2505 * any regulator state. IOW, regulator can be disabled or enabled.
2507 * If the regulator is enabled then the current will change to the new value
2508 * immediately otherwise if the regulator is disabled the regulator will
2509 * output at the new current when enabled.
2511 * NOTE: Regulator system constraints must be set for this regulator before
2512 * calling this function otherwise this call will fail.
2514 int regulator_set_current_limit(struct regulator *regulator,
2515 int min_uA, int max_uA)
2517 struct regulator_dev *rdev = regulator->rdev;
2520 mutex_lock(&rdev->mutex);
2523 if (!rdev->desc->ops->set_current_limit) {
2528 /* constraints check */
2529 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2533 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2535 mutex_unlock(&rdev->mutex);
2538 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2540 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2544 mutex_lock(&rdev->mutex);
2547 if (!rdev->desc->ops->get_current_limit) {
2552 ret = rdev->desc->ops->get_current_limit(rdev);
2554 mutex_unlock(&rdev->mutex);
2559 * regulator_get_current_limit - get regulator output current
2560 * @regulator: regulator source
2562 * This returns the current supplied by the specified current sink in uA.
2564 * NOTE: If the regulator is disabled it will return the current value. This
2565 * function should not be used to determine regulator state.
2567 int regulator_get_current_limit(struct regulator *regulator)
2569 return _regulator_get_current_limit(regulator->rdev);
2571 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2574 * regulator_set_mode - set regulator operating mode
2575 * @regulator: regulator source
2576 * @mode: operating mode - one of the REGULATOR_MODE constants
2578 * Set regulator operating mode to increase regulator efficiency or improve
2579 * regulation performance.
2581 * NOTE: Regulator system constraints must be set for this regulator before
2582 * calling this function otherwise this call will fail.
2584 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2586 struct regulator_dev *rdev = regulator->rdev;
2588 int regulator_curr_mode;
2590 mutex_lock(&rdev->mutex);
2593 if (!rdev->desc->ops->set_mode) {
2598 /* return if the same mode is requested */
2599 if (rdev->desc->ops->get_mode) {
2600 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2601 if (regulator_curr_mode == mode) {
2607 /* constraints check */
2608 ret = regulator_mode_constrain(rdev, &mode);
2612 ret = rdev->desc->ops->set_mode(rdev, mode);
2614 mutex_unlock(&rdev->mutex);
2617 EXPORT_SYMBOL_GPL(regulator_set_mode);
2619 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2623 mutex_lock(&rdev->mutex);
2626 if (!rdev->desc->ops->get_mode) {
2631 ret = rdev->desc->ops->get_mode(rdev);
2633 mutex_unlock(&rdev->mutex);
2638 * regulator_get_mode - get regulator operating mode
2639 * @regulator: regulator source
2641 * Get the current regulator operating mode.
2643 unsigned int regulator_get_mode(struct regulator *regulator)
2645 return _regulator_get_mode(regulator->rdev);
2647 EXPORT_SYMBOL_GPL(regulator_get_mode);
2650 * regulator_set_optimum_mode - set regulator optimum operating mode
2651 * @regulator: regulator source
2652 * @uA_load: load current
2654 * Notifies the regulator core of a new device load. This is then used by
2655 * DRMS (if enabled by constraints) to set the most efficient regulator
2656 * operating mode for the new regulator loading.
2658 * Consumer devices notify their supply regulator of the maximum power
2659 * they will require (can be taken from device datasheet in the power
2660 * consumption tables) when they change operational status and hence power
2661 * state. Examples of operational state changes that can affect power
2662 * consumption are :-
2664 * o Device is opened / closed.
2665 * o Device I/O is about to begin or has just finished.
2666 * o Device is idling in between work.
2668 * This information is also exported via sysfs to userspace.
2670 * DRMS will sum the total requested load on the regulator and change
2671 * to the most efficient operating mode if platform constraints allow.
2673 * Returns the new regulator mode or error.
2675 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2677 struct regulator_dev *rdev = regulator->rdev;
2678 struct regulator *consumer;
2679 int ret, output_uV, input_uV = 0, total_uA_load = 0;
2683 input_uV = regulator_get_voltage(rdev->supply);
2685 mutex_lock(&rdev->mutex);
2688 * first check to see if we can set modes at all, otherwise just
2689 * tell the consumer everything is OK.
2691 regulator->uA_load = uA_load;
2692 ret = regulator_check_drms(rdev);
2698 if (!rdev->desc->ops->get_optimum_mode)
2702 * we can actually do this so any errors are indicators of
2703 * potential real failure.
2707 if (!rdev->desc->ops->set_mode)
2710 /* get output voltage */
2711 output_uV = _regulator_get_voltage(rdev);
2712 if (output_uV <= 0) {
2713 rdev_err(rdev, "invalid output voltage found\n");
2717 /* No supply? Use constraint voltage */
2719 input_uV = rdev->constraints->input_uV;
2720 if (input_uV <= 0) {
2721 rdev_err(rdev, "invalid input voltage found\n");
2725 /* calc total requested load for this regulator */
2726 list_for_each_entry(consumer, &rdev->consumer_list, list)
2727 total_uA_load += consumer->uA_load;
2729 mode = rdev->desc->ops->get_optimum_mode(rdev,
2730 input_uV, output_uV,
2732 ret = regulator_mode_constrain(rdev, &mode);
2734 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2735 total_uA_load, input_uV, output_uV);
2739 ret = rdev->desc->ops->set_mode(rdev, mode);
2741 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2746 mutex_unlock(&rdev->mutex);
2749 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2752 * regulator_set_bypass_regmap - Default set_bypass() using regmap
2754 * @rdev: device to operate on.
2755 * @enable: state to set.
2757 int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
2762 val = rdev->desc->bypass_mask;
2766 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
2767 rdev->desc->bypass_mask, val);
2769 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
2772 * regulator_get_bypass_regmap - Default get_bypass() using regmap
2774 * @rdev: device to operate on.
2775 * @enable: current state.
2777 int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
2782 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
2786 *enable = val & rdev->desc->bypass_mask;
2790 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
2793 * regulator_allow_bypass - allow the regulator to go into bypass mode
2795 * @regulator: Regulator to configure
2796 * @allow: enable or disable bypass mode
2798 * Allow the regulator to go into bypass mode if all other consumers
2799 * for the regulator also enable bypass mode and the machine
2800 * constraints allow this. Bypass mode means that the regulator is
2801 * simply passing the input directly to the output with no regulation.
2803 int regulator_allow_bypass(struct regulator *regulator, bool enable)
2805 struct regulator_dev *rdev = regulator->rdev;
2808 if (!rdev->desc->ops->set_bypass)
2811 if (rdev->constraints &&
2812 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
2815 mutex_lock(&rdev->mutex);
2817 if (enable && !regulator->bypass) {
2818 rdev->bypass_count++;
2820 if (rdev->bypass_count == rdev->open_count) {
2821 ret = rdev->desc->ops->set_bypass(rdev, enable);
2823 rdev->bypass_count--;
2826 } else if (!enable && regulator->bypass) {
2827 rdev->bypass_count--;
2829 if (rdev->bypass_count != rdev->open_count) {
2830 ret = rdev->desc->ops->set_bypass(rdev, enable);
2832 rdev->bypass_count++;
2837 regulator->bypass = enable;
2839 mutex_unlock(&rdev->mutex);
2843 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
2846 * regulator_register_notifier - register regulator event notifier
2847 * @regulator: regulator source
2848 * @nb: notifier block
2850 * Register notifier block to receive regulator events.
2852 int regulator_register_notifier(struct regulator *regulator,
2853 struct notifier_block *nb)
2855 return blocking_notifier_chain_register(®ulator->rdev->notifier,
2858 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2861 * regulator_unregister_notifier - unregister regulator event notifier
2862 * @regulator: regulator source
2863 * @nb: notifier block
2865 * Unregister regulator event notifier block.
2867 int regulator_unregister_notifier(struct regulator *regulator,
2868 struct notifier_block *nb)
2870 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
2873 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2875 /* notify regulator consumers and downstream regulator consumers.
2876 * Note mutex must be held by caller.
2878 static void _notifier_call_chain(struct regulator_dev *rdev,
2879 unsigned long event, void *data)
2881 /* call rdev chain first */
2882 blocking_notifier_call_chain(&rdev->notifier, event, data);
2886 * regulator_bulk_get - get multiple regulator consumers
2888 * @dev: Device to supply
2889 * @num_consumers: Number of consumers to register
2890 * @consumers: Configuration of consumers; clients are stored here.
2892 * @return 0 on success, an errno on failure.
2894 * This helper function allows drivers to get several regulator
2895 * consumers in one operation. If any of the regulators cannot be
2896 * acquired then any regulators that were allocated will be freed
2897 * before returning to the caller.
2899 int regulator_bulk_get(struct device *dev, int num_consumers,
2900 struct regulator_bulk_data *consumers)
2905 for (i = 0; i < num_consumers; i++)
2906 consumers[i].consumer = NULL;
2908 for (i = 0; i < num_consumers; i++) {
2909 consumers[i].consumer = regulator_get(dev,
2910 consumers[i].supply);
2911 if (IS_ERR(consumers[i].consumer)) {
2912 ret = PTR_ERR(consumers[i].consumer);
2913 dev_err(dev, "Failed to get supply '%s': %d\n",
2914 consumers[i].supply, ret);
2915 consumers[i].consumer = NULL;
2924 regulator_put(consumers[i].consumer);
2928 EXPORT_SYMBOL_GPL(regulator_bulk_get);
2931 * devm_regulator_bulk_get - managed get multiple regulator consumers
2933 * @dev: Device to supply
2934 * @num_consumers: Number of consumers to register
2935 * @consumers: Configuration of consumers; clients are stored here.
2937 * @return 0 on success, an errno on failure.
2939 * This helper function allows drivers to get several regulator
2940 * consumers in one operation with management, the regulators will
2941 * automatically be freed when the device is unbound. If any of the
2942 * regulators cannot be acquired then any regulators that were
2943 * allocated will be freed before returning to the caller.
2945 int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2946 struct regulator_bulk_data *consumers)
2951 for (i = 0; i < num_consumers; i++)
2952 consumers[i].consumer = NULL;
2954 for (i = 0; i < num_consumers; i++) {
2955 consumers[i].consumer = devm_regulator_get(dev,
2956 consumers[i].supply);
2957 if (IS_ERR(consumers[i].consumer)) {
2958 ret = PTR_ERR(consumers[i].consumer);
2959 dev_err(dev, "Failed to get supply '%s': %d\n",
2960 consumers[i].supply, ret);
2961 consumers[i].consumer = NULL;
2969 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2970 devm_regulator_put(consumers[i].consumer);
2974 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2976 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2978 struct regulator_bulk_data *bulk = data;
2980 bulk->ret = regulator_enable(bulk->consumer);
2984 * regulator_bulk_enable - enable multiple regulator consumers
2986 * @num_consumers: Number of consumers
2987 * @consumers: Consumer data; clients are stored here.
2988 * @return 0 on success, an errno on failure
2990 * This convenience API allows consumers to enable multiple regulator
2991 * clients in a single API call. If any consumers cannot be enabled
2992 * then any others that were enabled will be disabled again prior to
2995 int regulator_bulk_enable(int num_consumers,
2996 struct regulator_bulk_data *consumers)
2998 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3002 for (i = 0; i < num_consumers; i++) {
3003 if (consumers[i].consumer->always_on)
3004 consumers[i].ret = 0;
3006 async_schedule_domain(regulator_bulk_enable_async,
3007 &consumers[i], &async_domain);
3010 async_synchronize_full_domain(&async_domain);
3012 /* If any consumer failed we need to unwind any that succeeded */
3013 for (i = 0; i < num_consumers; i++) {
3014 if (consumers[i].ret != 0) {
3015 ret = consumers[i].ret;
3023 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
3025 regulator_disable(consumers[i].consumer);
3029 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3032 * regulator_bulk_disable - disable multiple regulator consumers
3034 * @num_consumers: Number of consumers
3035 * @consumers: Consumer data; clients are stored here.
3036 * @return 0 on success, an errno on failure
3038 * This convenience API allows consumers to disable multiple regulator
3039 * clients in a single API call. If any consumers cannot be disabled
3040 * then any others that were disabled will be enabled again prior to
3043 int regulator_bulk_disable(int num_consumers,
3044 struct regulator_bulk_data *consumers)
3049 for (i = num_consumers - 1; i >= 0; --i) {
3050 ret = regulator_disable(consumers[i].consumer);
3058 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3059 for (++i; i < num_consumers; ++i) {
3060 r = regulator_enable(consumers[i].consumer);
3062 pr_err("Failed to reename %s: %d\n",
3063 consumers[i].supply, r);
3068 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3071 * regulator_bulk_force_disable - force disable multiple regulator consumers
3073 * @num_consumers: Number of consumers
3074 * @consumers: Consumer data; clients are stored here.
3075 * @return 0 on success, an errno on failure
3077 * This convenience API allows consumers to forcibly disable multiple regulator
3078 * clients in a single API call.
3079 * NOTE: This should be used for situations when device damage will
3080 * likely occur if the regulators are not disabled (e.g. over temp).
3081 * Although regulator_force_disable function call for some consumers can
3082 * return error numbers, the function is called for all consumers.
3084 int regulator_bulk_force_disable(int num_consumers,
3085 struct regulator_bulk_data *consumers)
3090 for (i = 0; i < num_consumers; i++)
3092 regulator_force_disable(consumers[i].consumer);
3094 for (i = 0; i < num_consumers; i++) {
3095 if (consumers[i].ret != 0) {
3096 ret = consumers[i].ret;
3105 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3108 * regulator_bulk_free - free multiple regulator consumers
3110 * @num_consumers: Number of consumers
3111 * @consumers: Consumer data; clients are stored here.
3113 * This convenience API allows consumers to free multiple regulator
3114 * clients in a single API call.
3116 void regulator_bulk_free(int num_consumers,
3117 struct regulator_bulk_data *consumers)
3121 for (i = 0; i < num_consumers; i++) {
3122 regulator_put(consumers[i].consumer);
3123 consumers[i].consumer = NULL;
3126 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3129 * regulator_notifier_call_chain - call regulator event notifier
3130 * @rdev: regulator source
3131 * @event: notifier block
3132 * @data: callback-specific data.
3134 * Called by regulator drivers to notify clients a regulator event has
3135 * occurred. We also notify regulator clients downstream.
3136 * Note lock must be held by caller.
3138 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3139 unsigned long event, void *data)
3141 _notifier_call_chain(rdev, event, data);
3145 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3148 * regulator_mode_to_status - convert a regulator mode into a status
3150 * @mode: Mode to convert
3152 * Convert a regulator mode into a status.
3154 int regulator_mode_to_status(unsigned int mode)
3157 case REGULATOR_MODE_FAST:
3158 return REGULATOR_STATUS_FAST;
3159 case REGULATOR_MODE_NORMAL:
3160 return REGULATOR_STATUS_NORMAL;
3161 case REGULATOR_MODE_IDLE:
3162 return REGULATOR_STATUS_IDLE;
3163 case REGULATOR_MODE_STANDBY:
3164 return REGULATOR_STATUS_STANDBY;
3166 return REGULATOR_STATUS_UNDEFINED;
3169 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3172 * To avoid cluttering sysfs (and memory) with useless state, only
3173 * create attributes that can be meaningfully displayed.
3175 static int add_regulator_attributes(struct regulator_dev *rdev)
3177 struct device *dev = &rdev->dev;
3178 struct regulator_ops *ops = rdev->desc->ops;
3181 /* some attributes need specific methods to be displayed */
3182 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3183 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3184 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) {
3185 status = device_create_file(dev, &dev_attr_microvolts);
3189 if (ops->get_current_limit) {
3190 status = device_create_file(dev, &dev_attr_microamps);
3194 if (ops->get_mode) {
3195 status = device_create_file(dev, &dev_attr_opmode);
3199 if (ops->is_enabled) {
3200 status = device_create_file(dev, &dev_attr_state);
3204 if (ops->get_status) {
3205 status = device_create_file(dev, &dev_attr_status);
3209 if (ops->get_bypass) {
3210 status = device_create_file(dev, &dev_attr_bypass);
3215 /* some attributes are type-specific */
3216 if (rdev->desc->type == REGULATOR_CURRENT) {
3217 status = device_create_file(dev, &dev_attr_requested_microamps);
3222 /* all the other attributes exist to support constraints;
3223 * don't show them if there are no constraints, or if the
3224 * relevant supporting methods are missing.
3226 if (!rdev->constraints)
3229 /* constraints need specific supporting methods */
3230 if (ops->set_voltage || ops->set_voltage_sel) {
3231 status = device_create_file(dev, &dev_attr_min_microvolts);
3234 status = device_create_file(dev, &dev_attr_max_microvolts);
3238 if (ops->set_current_limit) {
3239 status = device_create_file(dev, &dev_attr_min_microamps);
3242 status = device_create_file(dev, &dev_attr_max_microamps);
3247 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3250 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3253 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3257 if (ops->set_suspend_voltage) {
3258 status = device_create_file(dev,
3259 &dev_attr_suspend_standby_microvolts);
3262 status = device_create_file(dev,
3263 &dev_attr_suspend_mem_microvolts);
3266 status = device_create_file(dev,
3267 &dev_attr_suspend_disk_microvolts);
3272 if (ops->set_suspend_mode) {
3273 status = device_create_file(dev,
3274 &dev_attr_suspend_standby_mode);
3277 status = device_create_file(dev,
3278 &dev_attr_suspend_mem_mode);
3281 status = device_create_file(dev,
3282 &dev_attr_suspend_disk_mode);
3290 static void rdev_init_debugfs(struct regulator_dev *rdev)
3292 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3293 if (!rdev->debugfs) {
3294 rdev_warn(rdev, "Failed to create debugfs directory\n");
3298 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3300 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3302 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3303 &rdev->bypass_count);
3307 * regulator_register - register regulator
3308 * @regulator_desc: regulator to register
3309 * @config: runtime configuration for regulator
3311 * Called by regulator drivers to register a regulator.
3312 * Returns 0 on success.
3314 struct regulator_dev *
3315 regulator_register(const struct regulator_desc *regulator_desc,
3316 const struct regulator_config *config)
3318 const struct regulation_constraints *constraints = NULL;
3319 const struct regulator_init_data *init_data;
3320 static atomic_t regulator_no = ATOMIC_INIT(0);
3321 struct regulator_dev *rdev;
3324 const char *supply = NULL;
3326 if (regulator_desc == NULL || config == NULL)
3327 return ERR_PTR(-EINVAL);
3332 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3333 return ERR_PTR(-EINVAL);
3335 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3336 regulator_desc->type != REGULATOR_CURRENT)
3337 return ERR_PTR(-EINVAL);
3339 /* Only one of each should be implemented */
3340 WARN_ON(regulator_desc->ops->get_voltage &&
3341 regulator_desc->ops->get_voltage_sel);
3342 WARN_ON(regulator_desc->ops->set_voltage &&
3343 regulator_desc->ops->set_voltage_sel);
3345 /* If we're using selectors we must implement list_voltage. */
3346 if (regulator_desc->ops->get_voltage_sel &&
3347 !regulator_desc->ops->list_voltage) {
3348 return ERR_PTR(-EINVAL);
3350 if (regulator_desc->ops->set_voltage_sel &&
3351 !regulator_desc->ops->list_voltage) {
3352 return ERR_PTR(-EINVAL);
3355 init_data = config->init_data;
3357 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3359 return ERR_PTR(-ENOMEM);
3361 mutex_lock(®ulator_list_mutex);
3363 mutex_init(&rdev->mutex);
3364 rdev->reg_data = config->driver_data;
3365 rdev->owner = regulator_desc->owner;
3366 rdev->desc = regulator_desc;
3368 rdev->regmap = config->regmap;
3369 else if (dev_get_regmap(dev, NULL))
3370 rdev->regmap = dev_get_regmap(dev, NULL);
3371 else if (dev->parent)
3372 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3373 INIT_LIST_HEAD(&rdev->consumer_list);
3374 INIT_LIST_HEAD(&rdev->list);
3375 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3376 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3378 /* preform any regulator specific init */
3379 if (init_data && init_data->regulator_init) {
3380 ret = init_data->regulator_init(rdev->reg_data);
3385 /* register with sysfs */
3386 rdev->dev.class = ®ulator_class;
3387 rdev->dev.of_node = config->of_node;
3388 rdev->dev.parent = dev;
3389 dev_set_name(&rdev->dev, "regulator.%d",
3390 atomic_inc_return(®ulator_no) - 1);
3391 ret = device_register(&rdev->dev);
3393 put_device(&rdev->dev);
3397 dev_set_drvdata(&rdev->dev, rdev);
3399 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3400 ret = gpio_request_one(config->ena_gpio,
3401 GPIOF_DIR_OUT | config->ena_gpio_flags,
3402 rdev_get_name(rdev));
3404 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3405 config->ena_gpio, ret);
3409 rdev->ena_gpio = config->ena_gpio;
3410 rdev->ena_gpio_invert = config->ena_gpio_invert;
3412 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3413 rdev->ena_gpio_state = 1;
3415 if (rdev->ena_gpio_invert)
3416 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3419 /* set regulator constraints */
3421 constraints = &init_data->constraints;
3423 ret = set_machine_constraints(rdev, constraints);
3427 /* add attributes supported by this regulator */
3428 ret = add_regulator_attributes(rdev);
3432 if (init_data && init_data->supply_regulator)
3433 supply = init_data->supply_regulator;
3434 else if (regulator_desc->supply_name)
3435 supply = regulator_desc->supply_name;
3438 struct regulator_dev *r;
3440 r = regulator_dev_lookup(dev, supply, &ret);
3443 dev_err(dev, "Failed to find supply %s\n", supply);
3444 ret = -EPROBE_DEFER;
3448 ret = set_supply(rdev, r);
3452 /* Enable supply if rail is enabled */
3453 if (_regulator_is_enabled(rdev)) {
3454 ret = regulator_enable(rdev->supply);
3460 /* add consumers devices */
3462 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3463 ret = set_consumer_device_supply(rdev,
3464 init_data->consumer_supplies[i].dev_name,
3465 init_data->consumer_supplies[i].supply);
3467 dev_err(dev, "Failed to set supply %s\n",
3468 init_data->consumer_supplies[i].supply);
3469 goto unset_supplies;
3474 list_add(&rdev->list, ®ulator_list);
3476 rdev_init_debugfs(rdev);
3478 mutex_unlock(®ulator_list_mutex);
3482 unset_regulator_supplies(rdev);
3486 _regulator_put(rdev->supply);
3488 gpio_free(rdev->ena_gpio);
3489 kfree(rdev->constraints);
3491 device_unregister(&rdev->dev);
3492 /* device core frees rdev */
3493 rdev = ERR_PTR(ret);
3498 rdev = ERR_PTR(ret);
3501 EXPORT_SYMBOL_GPL(regulator_register);
3504 * regulator_unregister - unregister regulator
3505 * @rdev: regulator to unregister
3507 * Called by regulator drivers to unregister a regulator.
3509 void regulator_unregister(struct regulator_dev *rdev)
3515 regulator_put(rdev->supply);
3516 mutex_lock(®ulator_list_mutex);
3517 debugfs_remove_recursive(rdev->debugfs);
3518 flush_work(&rdev->disable_work.work);
3519 WARN_ON(rdev->open_count);
3520 unset_regulator_supplies(rdev);
3521 list_del(&rdev->list);
3522 kfree(rdev->constraints);
3524 gpio_free(rdev->ena_gpio);
3525 device_unregister(&rdev->dev);
3526 mutex_unlock(®ulator_list_mutex);
3528 EXPORT_SYMBOL_GPL(regulator_unregister);
3531 * regulator_suspend_prepare - prepare regulators for system wide suspend
3532 * @state: system suspend state
3534 * Configure each regulator with it's suspend operating parameters for state.
3535 * This will usually be called by machine suspend code prior to supending.
3537 int regulator_suspend_prepare(suspend_state_t state)
3539 struct regulator_dev *rdev;
3542 /* ON is handled by regulator active state */
3543 if (state == PM_SUSPEND_ON)
3546 mutex_lock(®ulator_list_mutex);
3547 list_for_each_entry(rdev, ®ulator_list, list) {
3549 mutex_lock(&rdev->mutex);
3550 ret = suspend_prepare(rdev, state);
3551 mutex_unlock(&rdev->mutex);
3554 rdev_err(rdev, "failed to prepare\n");
3559 mutex_unlock(®ulator_list_mutex);
3562 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3565 * regulator_suspend_finish - resume regulators from system wide suspend
3567 * Turn on regulators that might be turned off by regulator_suspend_prepare
3568 * and that should be turned on according to the regulators properties.
3570 int regulator_suspend_finish(void)
3572 struct regulator_dev *rdev;
3575 mutex_lock(®ulator_list_mutex);
3576 list_for_each_entry(rdev, ®ulator_list, list) {
3577 struct regulator_ops *ops = rdev->desc->ops;
3579 mutex_lock(&rdev->mutex);
3580 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3582 error = ops->enable(rdev);
3586 if (!has_full_constraints)
3590 if (!_regulator_is_enabled(rdev))
3593 error = ops->disable(rdev);
3598 mutex_unlock(&rdev->mutex);
3600 mutex_unlock(®ulator_list_mutex);
3603 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3606 * regulator_has_full_constraints - the system has fully specified constraints
3608 * Calling this function will cause the regulator API to disable all
3609 * regulators which have a zero use count and don't have an always_on
3610 * constraint in a late_initcall.
3612 * The intention is that this will become the default behaviour in a
3613 * future kernel release so users are encouraged to use this facility
3616 void regulator_has_full_constraints(void)
3618 has_full_constraints = 1;
3620 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3623 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3625 * Calling this function will cause the regulator API to provide a
3626 * dummy regulator to consumers if no physical regulator is found,
3627 * allowing most consumers to proceed as though a regulator were
3628 * configured. This allows systems such as those with software
3629 * controllable regulators for the CPU core only to be brought up more
3632 void regulator_use_dummy_regulator(void)
3634 board_wants_dummy_regulator = true;
3636 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3639 * rdev_get_drvdata - get rdev regulator driver data
3642 * Get rdev regulator driver private data. This call can be used in the
3643 * regulator driver context.
3645 void *rdev_get_drvdata(struct regulator_dev *rdev)
3647 return rdev->reg_data;
3649 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3652 * regulator_get_drvdata - get regulator driver data
3653 * @regulator: regulator
3655 * Get regulator driver private data. This call can be used in the consumer
3656 * driver context when non API regulator specific functions need to be called.
3658 void *regulator_get_drvdata(struct regulator *regulator)
3660 return regulator->rdev->reg_data;
3662 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3665 * regulator_set_drvdata - set regulator driver data
3666 * @regulator: regulator
3669 void regulator_set_drvdata(struct regulator *regulator, void *data)
3671 regulator->rdev->reg_data = data;
3673 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3676 * regulator_get_id - get regulator ID
3679 int rdev_get_id(struct regulator_dev *rdev)
3681 return rdev->desc->id;
3683 EXPORT_SYMBOL_GPL(rdev_get_id);
3685 struct device *rdev_get_dev(struct regulator_dev *rdev)
3689 EXPORT_SYMBOL_GPL(rdev_get_dev);
3691 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3693 return reg_init_data->driver_data;
3695 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3697 #ifdef CONFIG_DEBUG_FS
3698 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3699 size_t count, loff_t *ppos)
3701 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3702 ssize_t len, ret = 0;
3703 struct regulator_map *map;
3708 list_for_each_entry(map, ®ulator_map_list, list) {
3709 len = snprintf(buf + ret, PAGE_SIZE - ret,
3711 rdev_get_name(map->regulator), map->dev_name,
3715 if (ret > PAGE_SIZE) {
3721 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3729 static const struct file_operations supply_map_fops = {
3730 #ifdef CONFIG_DEBUG_FS
3731 .read = supply_map_read_file,
3732 .llseek = default_llseek,
3736 static int __init regulator_init(void)
3740 ret = class_register(®ulator_class);
3742 debugfs_root = debugfs_create_dir("regulator", NULL);
3744 pr_warn("regulator: Failed to create debugfs directory\n");
3746 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3749 regulator_dummy_init();
3754 /* init early to allow our consumers to complete system booting */
3755 core_initcall(regulator_init);
3757 static int __init regulator_init_complete(void)
3759 struct regulator_dev *rdev;
3760 struct regulator_ops *ops;
3761 struct regulation_constraints *c;
3765 * Since DT doesn't provide an idiomatic mechanism for
3766 * enabling full constraints and since it's much more natural
3767 * with DT to provide them just assume that a DT enabled
3768 * system has full constraints.
3770 if (of_have_populated_dt())
3771 has_full_constraints = true;
3773 mutex_lock(®ulator_list_mutex);
3775 /* If we have a full configuration then disable any regulators
3776 * which are not in use or always_on. This will become the
3777 * default behaviour in the future.
3779 list_for_each_entry(rdev, ®ulator_list, list) {
3780 ops = rdev->desc->ops;
3781 c = rdev->constraints;
3783 if (!ops->disable || (c && c->always_on))
3786 mutex_lock(&rdev->mutex);
3788 if (rdev->use_count)
3791 /* If we can't read the status assume it's on. */
3792 if (ops->is_enabled)
3793 enabled = ops->is_enabled(rdev);
3800 if (has_full_constraints) {
3801 /* We log since this may kill the system if it
3803 rdev_info(rdev, "disabling\n");
3804 ret = ops->disable(rdev);
3806 rdev_err(rdev, "couldn't disable: %d\n", ret);
3809 /* The intention is that in future we will
3810 * assume that full constraints are provided
3811 * so warn even if we aren't going to do
3814 rdev_warn(rdev, "incomplete constraints, leaving on\n");
3818 mutex_unlock(&rdev->mutex);
3821 mutex_unlock(®ulator_list_mutex);
3825 late_initcall(regulator_init_complete);