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 LIST_HEAD(regulator_ena_gpio_list);
55 static bool has_full_constraints;
56 static bool board_wants_dummy_regulator;
58 static struct dentry *debugfs_root;
61 * struct regulator_map
63 * Used to provide symbolic supply names to devices.
65 struct regulator_map {
66 struct list_head list;
67 const char *dev_name; /* The dev_name() for the consumer */
69 struct regulator_dev *regulator;
73 * struct regulator_enable_gpio
75 * Management for shared enable GPIO pin
77 struct regulator_enable_gpio {
78 struct list_head list;
80 u32 enable_count; /* a number of enabled shared GPIO */
81 u32 request_count; /* a number of requested shared GPIO */
82 unsigned int ena_gpio_invert:1;
88 * One for each consumer device.
92 struct list_head list;
93 unsigned int always_on:1;
94 unsigned int bypass:1;
99 struct device_attribute dev_attr;
100 struct regulator_dev *rdev;
101 struct dentry *debugfs;
104 static int _regulator_is_enabled(struct regulator_dev *rdev);
105 static int _regulator_disable(struct regulator_dev *rdev);
106 static int _regulator_get_voltage(struct regulator_dev *rdev);
107 static int _regulator_get_current_limit(struct regulator_dev *rdev);
108 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
109 static void _notifier_call_chain(struct regulator_dev *rdev,
110 unsigned long event, void *data);
111 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
112 int min_uV, int max_uV);
113 static struct regulator *create_regulator(struct regulator_dev *rdev,
115 const char *supply_name);
117 static const char *rdev_get_name(struct regulator_dev *rdev)
119 if (rdev->constraints && rdev->constraints->name)
120 return rdev->constraints->name;
121 else if (rdev->desc->name)
122 return rdev->desc->name;
128 * of_get_regulator - get a regulator device node based on supply name
129 * @dev: Device pointer for the consumer (of regulator) device
130 * @supply: regulator supply name
132 * Extract the regulator device node corresponding to the supply name.
133 * returns the device node corresponding to the regulator if found, else
136 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
138 struct device_node *regnode = NULL;
139 char prop_name[32]; /* 32 is max size of property name */
141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
143 snprintf(prop_name, 32, "%s-supply", supply);
144 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
147 dev_dbg(dev, "Looking up %s property in node %s failed",
148 prop_name, dev->of_node->full_name);
154 static int _regulator_can_change_status(struct regulator_dev *rdev)
156 if (!rdev->constraints)
159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
165 /* Platform voltage constraint check */
166 static int regulator_check_voltage(struct regulator_dev *rdev,
167 int *min_uV, int *max_uV)
169 BUG_ON(*min_uV > *max_uV);
171 if (!rdev->constraints) {
172 rdev_err(rdev, "no constraints\n");
175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
176 rdev_err(rdev, "operation not allowed\n");
180 if (*max_uV > rdev->constraints->max_uV)
181 *max_uV = rdev->constraints->max_uV;
182 if (*min_uV < rdev->constraints->min_uV)
183 *min_uV = rdev->constraints->min_uV;
185 if (*min_uV > *max_uV) {
186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
194 /* Make sure we select a voltage that suits the needs of all
195 * regulator consumers
197 static int regulator_check_consumers(struct regulator_dev *rdev,
198 int *min_uV, int *max_uV)
200 struct regulator *regulator;
202 list_for_each_entry(regulator, &rdev->consumer_list, list) {
204 * Assume consumers that didn't say anything are OK
205 * with anything in the constraint range.
207 if (!regulator->min_uV && !regulator->max_uV)
210 if (*max_uV > regulator->max_uV)
211 *max_uV = regulator->max_uV;
212 if (*min_uV < regulator->min_uV)
213 *min_uV = regulator->min_uV;
216 if (*min_uV > *max_uV) {
217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
225 /* current constraint check */
226 static int regulator_check_current_limit(struct regulator_dev *rdev,
227 int *min_uA, int *max_uA)
229 BUG_ON(*min_uA > *max_uA);
231 if (!rdev->constraints) {
232 rdev_err(rdev, "no constraints\n");
235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
236 rdev_err(rdev, "operation not allowed\n");
240 if (*max_uA > rdev->constraints->max_uA)
241 *max_uA = rdev->constraints->max_uA;
242 if (*min_uA < rdev->constraints->min_uA)
243 *min_uA = rdev->constraints->min_uA;
245 if (*min_uA > *max_uA) {
246 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
254 /* operating mode constraint check */
255 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
258 case REGULATOR_MODE_FAST:
259 case REGULATOR_MODE_NORMAL:
260 case REGULATOR_MODE_IDLE:
261 case REGULATOR_MODE_STANDBY:
264 rdev_err(rdev, "invalid mode %x specified\n", *mode);
268 if (!rdev->constraints) {
269 rdev_err(rdev, "no constraints\n");
272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
273 rdev_err(rdev, "operation not allowed\n");
277 /* The modes are bitmasks, the most power hungry modes having
278 * the lowest values. If the requested mode isn't supported
279 * try higher modes. */
281 if (rdev->constraints->valid_modes_mask & *mode)
289 /* dynamic regulator mode switching constraint check */
290 static int regulator_check_drms(struct regulator_dev *rdev)
292 if (!rdev->constraints) {
293 rdev_err(rdev, "no constraints\n");
296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
297 rdev_err(rdev, "operation not allowed\n");
303 static ssize_t regulator_uV_show(struct device *dev,
304 struct device_attribute *attr, char *buf)
306 struct regulator_dev *rdev = dev_get_drvdata(dev);
309 mutex_lock(&rdev->mutex);
310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
311 mutex_unlock(&rdev->mutex);
315 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
317 static ssize_t regulator_uA_show(struct device *dev,
318 struct device_attribute *attr, char *buf)
320 struct regulator_dev *rdev = dev_get_drvdata(dev);
322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
324 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
326 static ssize_t regulator_name_show(struct device *dev,
327 struct device_attribute *attr, char *buf)
329 struct regulator_dev *rdev = dev_get_drvdata(dev);
331 return sprintf(buf, "%s\n", rdev_get_name(rdev));
334 static ssize_t regulator_print_opmode(char *buf, int mode)
337 case REGULATOR_MODE_FAST:
338 return sprintf(buf, "fast\n");
339 case REGULATOR_MODE_NORMAL:
340 return sprintf(buf, "normal\n");
341 case REGULATOR_MODE_IDLE:
342 return sprintf(buf, "idle\n");
343 case REGULATOR_MODE_STANDBY:
344 return sprintf(buf, "standby\n");
346 return sprintf(buf, "unknown\n");
349 static ssize_t regulator_opmode_show(struct device *dev,
350 struct device_attribute *attr, char *buf)
352 struct regulator_dev *rdev = dev_get_drvdata(dev);
354 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
356 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
358 static ssize_t regulator_print_state(char *buf, int state)
361 return sprintf(buf, "enabled\n");
363 return sprintf(buf, "disabled\n");
365 return sprintf(buf, "unknown\n");
368 static ssize_t regulator_state_show(struct device *dev,
369 struct device_attribute *attr, char *buf)
371 struct regulator_dev *rdev = dev_get_drvdata(dev);
374 mutex_lock(&rdev->mutex);
375 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
376 mutex_unlock(&rdev->mutex);
380 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
382 static ssize_t regulator_status_show(struct device *dev,
383 struct device_attribute *attr, char *buf)
385 struct regulator_dev *rdev = dev_get_drvdata(dev);
389 status = rdev->desc->ops->get_status(rdev);
394 case REGULATOR_STATUS_OFF:
397 case REGULATOR_STATUS_ON:
400 case REGULATOR_STATUS_ERROR:
403 case REGULATOR_STATUS_FAST:
406 case REGULATOR_STATUS_NORMAL:
409 case REGULATOR_STATUS_IDLE:
412 case REGULATOR_STATUS_STANDBY:
415 case REGULATOR_STATUS_BYPASS:
418 case REGULATOR_STATUS_UNDEFINED:
425 return sprintf(buf, "%s\n", label);
427 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
429 static ssize_t regulator_min_uA_show(struct device *dev,
430 struct device_attribute *attr, char *buf)
432 struct regulator_dev *rdev = dev_get_drvdata(dev);
434 if (!rdev->constraints)
435 return sprintf(buf, "constraint not defined\n");
437 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
439 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
441 static ssize_t regulator_max_uA_show(struct device *dev,
442 struct device_attribute *attr, char *buf)
444 struct regulator_dev *rdev = dev_get_drvdata(dev);
446 if (!rdev->constraints)
447 return sprintf(buf, "constraint not defined\n");
449 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
451 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
453 static ssize_t regulator_min_uV_show(struct device *dev,
454 struct device_attribute *attr, char *buf)
456 struct regulator_dev *rdev = dev_get_drvdata(dev);
458 if (!rdev->constraints)
459 return sprintf(buf, "constraint not defined\n");
461 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
463 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
465 static ssize_t regulator_max_uV_show(struct device *dev,
466 struct device_attribute *attr, char *buf)
468 struct regulator_dev *rdev = dev_get_drvdata(dev);
470 if (!rdev->constraints)
471 return sprintf(buf, "constraint not defined\n");
473 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
475 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
477 static ssize_t regulator_total_uA_show(struct device *dev,
478 struct device_attribute *attr, char *buf)
480 struct regulator_dev *rdev = dev_get_drvdata(dev);
481 struct regulator *regulator;
484 mutex_lock(&rdev->mutex);
485 list_for_each_entry(regulator, &rdev->consumer_list, list)
486 uA += regulator->uA_load;
487 mutex_unlock(&rdev->mutex);
488 return sprintf(buf, "%d\n", uA);
490 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
492 static ssize_t regulator_num_users_show(struct device *dev,
493 struct device_attribute *attr, char *buf)
495 struct regulator_dev *rdev = dev_get_drvdata(dev);
496 return sprintf(buf, "%d\n", rdev->use_count);
499 static ssize_t regulator_type_show(struct device *dev,
500 struct device_attribute *attr, char *buf)
502 struct regulator_dev *rdev = dev_get_drvdata(dev);
504 switch (rdev->desc->type) {
505 case REGULATOR_VOLTAGE:
506 return sprintf(buf, "voltage\n");
507 case REGULATOR_CURRENT:
508 return sprintf(buf, "current\n");
510 return sprintf(buf, "unknown\n");
513 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
514 struct device_attribute *attr, char *buf)
516 struct regulator_dev *rdev = dev_get_drvdata(dev);
518 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
520 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
521 regulator_suspend_mem_uV_show, NULL);
523 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
524 struct device_attribute *attr, char *buf)
526 struct regulator_dev *rdev = dev_get_drvdata(dev);
528 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
530 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
531 regulator_suspend_disk_uV_show, NULL);
533 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
534 struct device_attribute *attr, char *buf)
536 struct regulator_dev *rdev = dev_get_drvdata(dev);
538 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
540 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
541 regulator_suspend_standby_uV_show, NULL);
543 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
544 struct device_attribute *attr, char *buf)
546 struct regulator_dev *rdev = dev_get_drvdata(dev);
548 return regulator_print_opmode(buf,
549 rdev->constraints->state_mem.mode);
551 static DEVICE_ATTR(suspend_mem_mode, 0444,
552 regulator_suspend_mem_mode_show, NULL);
554 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
555 struct device_attribute *attr, char *buf)
557 struct regulator_dev *rdev = dev_get_drvdata(dev);
559 return regulator_print_opmode(buf,
560 rdev->constraints->state_disk.mode);
562 static DEVICE_ATTR(suspend_disk_mode, 0444,
563 regulator_suspend_disk_mode_show, NULL);
565 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
566 struct device_attribute *attr, char *buf)
568 struct regulator_dev *rdev = dev_get_drvdata(dev);
570 return regulator_print_opmode(buf,
571 rdev->constraints->state_standby.mode);
573 static DEVICE_ATTR(suspend_standby_mode, 0444,
574 regulator_suspend_standby_mode_show, NULL);
576 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
577 struct device_attribute *attr, char *buf)
579 struct regulator_dev *rdev = dev_get_drvdata(dev);
581 return regulator_print_state(buf,
582 rdev->constraints->state_mem.enabled);
584 static DEVICE_ATTR(suspend_mem_state, 0444,
585 regulator_suspend_mem_state_show, NULL);
587 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
588 struct device_attribute *attr, char *buf)
590 struct regulator_dev *rdev = dev_get_drvdata(dev);
592 return regulator_print_state(buf,
593 rdev->constraints->state_disk.enabled);
595 static DEVICE_ATTR(suspend_disk_state, 0444,
596 regulator_suspend_disk_state_show, NULL);
598 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
599 struct device_attribute *attr, char *buf)
601 struct regulator_dev *rdev = dev_get_drvdata(dev);
603 return regulator_print_state(buf,
604 rdev->constraints->state_standby.enabled);
606 static DEVICE_ATTR(suspend_standby_state, 0444,
607 regulator_suspend_standby_state_show, NULL);
609 static ssize_t regulator_bypass_show(struct device *dev,
610 struct device_attribute *attr, char *buf)
612 struct regulator_dev *rdev = dev_get_drvdata(dev);
617 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
626 return sprintf(buf, "%s\n", report);
628 static DEVICE_ATTR(bypass, 0444,
629 regulator_bypass_show, NULL);
632 * These are the only attributes are present for all regulators.
633 * Other attributes are a function of regulator functionality.
635 static struct device_attribute regulator_dev_attrs[] = {
636 __ATTR(name, 0444, regulator_name_show, NULL),
637 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
638 __ATTR(type, 0444, regulator_type_show, NULL),
642 static void regulator_dev_release(struct device *dev)
644 struct regulator_dev *rdev = dev_get_drvdata(dev);
648 static struct class regulator_class = {
650 .dev_release = regulator_dev_release,
651 .dev_attrs = regulator_dev_attrs,
654 /* Calculate the new optimum regulator operating mode based on the new total
655 * consumer load. All locks held by caller */
656 static void drms_uA_update(struct regulator_dev *rdev)
658 struct regulator *sibling;
659 int current_uA = 0, output_uV, input_uV, err;
662 err = regulator_check_drms(rdev);
663 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
664 (!rdev->desc->ops->get_voltage &&
665 !rdev->desc->ops->get_voltage_sel) ||
666 !rdev->desc->ops->set_mode)
669 /* get output voltage */
670 output_uV = _regulator_get_voltage(rdev);
674 /* get input voltage */
677 input_uV = regulator_get_voltage(rdev->supply);
679 input_uV = rdev->constraints->input_uV;
683 /* calc total requested load */
684 list_for_each_entry(sibling, &rdev->consumer_list, list)
685 current_uA += sibling->uA_load;
687 /* now get the optimum mode for our new total regulator load */
688 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
689 output_uV, current_uA);
691 /* check the new mode is allowed */
692 err = regulator_mode_constrain(rdev, &mode);
694 rdev->desc->ops->set_mode(rdev, mode);
697 static int suspend_set_state(struct regulator_dev *rdev,
698 struct regulator_state *rstate)
702 /* If we have no suspend mode configration don't set anything;
703 * only warn if the driver implements set_suspend_voltage or
704 * set_suspend_mode callback.
706 if (!rstate->enabled && !rstate->disabled) {
707 if (rdev->desc->ops->set_suspend_voltage ||
708 rdev->desc->ops->set_suspend_mode)
709 rdev_warn(rdev, "No configuration\n");
713 if (rstate->enabled && rstate->disabled) {
714 rdev_err(rdev, "invalid configuration\n");
718 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
719 ret = rdev->desc->ops->set_suspend_enable(rdev);
720 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
721 ret = rdev->desc->ops->set_suspend_disable(rdev);
722 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
726 rdev_err(rdev, "failed to enabled/disable\n");
730 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
731 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
733 rdev_err(rdev, "failed to set voltage\n");
738 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
739 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
741 rdev_err(rdev, "failed to set mode\n");
748 /* locks held by caller */
749 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
751 if (!rdev->constraints)
755 case PM_SUSPEND_STANDBY:
756 return suspend_set_state(rdev,
757 &rdev->constraints->state_standby);
759 return suspend_set_state(rdev,
760 &rdev->constraints->state_mem);
762 return suspend_set_state(rdev,
763 &rdev->constraints->state_disk);
769 static void print_constraints(struct regulator_dev *rdev)
771 struct regulation_constraints *constraints = rdev->constraints;
776 if (constraints->min_uV && constraints->max_uV) {
777 if (constraints->min_uV == constraints->max_uV)
778 count += sprintf(buf + count, "%d mV ",
779 constraints->min_uV / 1000);
781 count += sprintf(buf + count, "%d <--> %d mV ",
782 constraints->min_uV / 1000,
783 constraints->max_uV / 1000);
786 if (!constraints->min_uV ||
787 constraints->min_uV != constraints->max_uV) {
788 ret = _regulator_get_voltage(rdev);
790 count += sprintf(buf + count, "at %d mV ", ret / 1000);
793 if (constraints->uV_offset)
794 count += sprintf(buf, "%dmV offset ",
795 constraints->uV_offset / 1000);
797 if (constraints->min_uA && constraints->max_uA) {
798 if (constraints->min_uA == constraints->max_uA)
799 count += sprintf(buf + count, "%d mA ",
800 constraints->min_uA / 1000);
802 count += sprintf(buf + count, "%d <--> %d mA ",
803 constraints->min_uA / 1000,
804 constraints->max_uA / 1000);
807 if (!constraints->min_uA ||
808 constraints->min_uA != constraints->max_uA) {
809 ret = _regulator_get_current_limit(rdev);
811 count += sprintf(buf + count, "at %d mA ", ret / 1000);
814 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
815 count += sprintf(buf + count, "fast ");
816 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
817 count += sprintf(buf + count, "normal ");
818 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
819 count += sprintf(buf + count, "idle ");
820 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
821 count += sprintf(buf + count, "standby");
824 sprintf(buf, "no parameters");
826 rdev_info(rdev, "%s\n", buf);
828 if ((constraints->min_uV != constraints->max_uV) &&
829 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
831 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
834 static int machine_constraints_voltage(struct regulator_dev *rdev,
835 struct regulation_constraints *constraints)
837 struct regulator_ops *ops = rdev->desc->ops;
840 /* do we need to apply the constraint voltage */
841 if (rdev->constraints->apply_uV &&
842 rdev->constraints->min_uV == rdev->constraints->max_uV) {
843 ret = _regulator_do_set_voltage(rdev,
844 rdev->constraints->min_uV,
845 rdev->constraints->max_uV);
847 rdev_err(rdev, "failed to apply %duV constraint\n",
848 rdev->constraints->min_uV);
853 /* constrain machine-level voltage specs to fit
854 * the actual range supported by this regulator.
856 if (ops->list_voltage && rdev->desc->n_voltages) {
857 int count = rdev->desc->n_voltages;
859 int min_uV = INT_MAX;
860 int max_uV = INT_MIN;
861 int cmin = constraints->min_uV;
862 int cmax = constraints->max_uV;
864 /* it's safe to autoconfigure fixed-voltage supplies
865 and the constraints are used by list_voltage. */
866 if (count == 1 && !cmin) {
869 constraints->min_uV = cmin;
870 constraints->max_uV = cmax;
873 /* voltage constraints are optional */
874 if ((cmin == 0) && (cmax == 0))
877 /* else require explicit machine-level constraints */
878 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
879 rdev_err(rdev, "invalid voltage constraints\n");
883 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
884 for (i = 0; i < count; i++) {
887 value = ops->list_voltage(rdev, i);
891 /* maybe adjust [min_uV..max_uV] */
892 if (value >= cmin && value < min_uV)
894 if (value <= cmax && value > max_uV)
898 /* final: [min_uV..max_uV] valid iff constraints valid */
899 if (max_uV < min_uV) {
901 "unsupportable voltage constraints %u-%uuV\n",
906 /* use regulator's subset of machine constraints */
907 if (constraints->min_uV < min_uV) {
908 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
909 constraints->min_uV, min_uV);
910 constraints->min_uV = min_uV;
912 if (constraints->max_uV > max_uV) {
913 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
914 constraints->max_uV, max_uV);
915 constraints->max_uV = max_uV;
923 * set_machine_constraints - sets regulator constraints
924 * @rdev: regulator source
925 * @constraints: constraints to apply
927 * Allows platform initialisation code to define and constrain
928 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
929 * Constraints *must* be set by platform code in order for some
930 * regulator operations to proceed i.e. set_voltage, set_current_limit,
933 static int set_machine_constraints(struct regulator_dev *rdev,
934 const struct regulation_constraints *constraints)
937 struct regulator_ops *ops = rdev->desc->ops;
940 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
943 rdev->constraints = kzalloc(sizeof(*constraints),
945 if (!rdev->constraints)
948 ret = machine_constraints_voltage(rdev, rdev->constraints);
952 /* do we need to setup our suspend state */
953 if (rdev->constraints->initial_state) {
954 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
956 rdev_err(rdev, "failed to set suspend state\n");
961 if (rdev->constraints->initial_mode) {
962 if (!ops->set_mode) {
963 rdev_err(rdev, "no set_mode operation\n");
968 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
970 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
975 /* If the constraints say the regulator should be on at this point
976 * and we have control then make sure it is enabled.
978 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
980 ret = ops->enable(rdev);
982 rdev_err(rdev, "failed to enable\n");
987 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) {
988 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
990 rdev_err(rdev, "failed to set ramp_delay\n");
995 print_constraints(rdev);
998 kfree(rdev->constraints);
999 rdev->constraints = NULL;
1004 * set_supply - set regulator supply regulator
1005 * @rdev: regulator name
1006 * @supply_rdev: supply regulator name
1008 * Called by platform initialisation code to set the supply regulator for this
1009 * regulator. This ensures that a regulators supply will also be enabled by the
1010 * core if it's child is enabled.
1012 static int set_supply(struct regulator_dev *rdev,
1013 struct regulator_dev *supply_rdev)
1017 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1019 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1020 if (rdev->supply == NULL) {
1024 supply_rdev->open_count++;
1030 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1031 * @rdev: regulator source
1032 * @consumer_dev_name: dev_name() string for device supply applies to
1033 * @supply: symbolic name for supply
1035 * Allows platform initialisation code to map physical regulator
1036 * sources to symbolic names for supplies for use by devices. Devices
1037 * should use these symbolic names to request regulators, avoiding the
1038 * need to provide board-specific regulator names as platform data.
1040 static int set_consumer_device_supply(struct regulator_dev *rdev,
1041 const char *consumer_dev_name,
1044 struct regulator_map *node;
1050 if (consumer_dev_name != NULL)
1055 list_for_each_entry(node, ®ulator_map_list, list) {
1056 if (node->dev_name && consumer_dev_name) {
1057 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1059 } else if (node->dev_name || consumer_dev_name) {
1063 if (strcmp(node->supply, supply) != 0)
1066 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1068 dev_name(&node->regulator->dev),
1069 node->regulator->desc->name,
1071 dev_name(&rdev->dev), rdev_get_name(rdev));
1075 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1079 node->regulator = rdev;
1080 node->supply = supply;
1083 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1084 if (node->dev_name == NULL) {
1090 list_add(&node->list, ®ulator_map_list);
1094 static void unset_regulator_supplies(struct regulator_dev *rdev)
1096 struct regulator_map *node, *n;
1098 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1099 if (rdev == node->regulator) {
1100 list_del(&node->list);
1101 kfree(node->dev_name);
1107 #define REG_STR_SIZE 64
1109 static struct regulator *create_regulator(struct regulator_dev *rdev,
1111 const char *supply_name)
1113 struct regulator *regulator;
1114 char buf[REG_STR_SIZE];
1117 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1118 if (regulator == NULL)
1121 mutex_lock(&rdev->mutex);
1122 regulator->rdev = rdev;
1123 list_add(®ulator->list, &rdev->consumer_list);
1126 regulator->dev = dev;
1128 /* Add a link to the device sysfs entry */
1129 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1130 dev->kobj.name, supply_name);
1131 if (size >= REG_STR_SIZE)
1134 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1135 if (regulator->supply_name == NULL)
1138 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1141 rdev_warn(rdev, "could not add device link %s err %d\n",
1142 dev->kobj.name, err);
1146 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1147 if (regulator->supply_name == NULL)
1151 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1153 if (!regulator->debugfs) {
1154 rdev_warn(rdev, "Failed to create debugfs directory\n");
1156 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1157 ®ulator->uA_load);
1158 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1159 ®ulator->min_uV);
1160 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1161 ®ulator->max_uV);
1165 * Check now if the regulator is an always on regulator - if
1166 * it is then we don't need to do nearly so much work for
1167 * enable/disable calls.
1169 if (!_regulator_can_change_status(rdev) &&
1170 _regulator_is_enabled(rdev))
1171 regulator->always_on = true;
1173 mutex_unlock(&rdev->mutex);
1176 list_del(®ulator->list);
1178 mutex_unlock(&rdev->mutex);
1182 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1184 if (!rdev->desc->ops->enable_time)
1185 return rdev->desc->enable_time;
1186 return rdev->desc->ops->enable_time(rdev);
1189 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1193 struct regulator_dev *r;
1194 struct device_node *node;
1195 struct regulator_map *map;
1196 const char *devname = NULL;
1198 /* first do a dt based lookup */
1199 if (dev && dev->of_node) {
1200 node = of_get_regulator(dev, supply);
1202 list_for_each_entry(r, ®ulator_list, list)
1203 if (r->dev.parent &&
1204 node == r->dev.of_node)
1208 * If we couldn't even get the node then it's
1209 * not just that the device didn't register
1210 * yet, there's no node and we'll never
1217 /* if not found, try doing it non-dt way */
1219 devname = dev_name(dev);
1221 list_for_each_entry(r, ®ulator_list, list)
1222 if (strcmp(rdev_get_name(r), supply) == 0)
1225 list_for_each_entry(map, ®ulator_map_list, list) {
1226 /* If the mapping has a device set up it must match */
1227 if (map->dev_name &&
1228 (!devname || strcmp(map->dev_name, devname)))
1231 if (strcmp(map->supply, supply) == 0)
1232 return map->regulator;
1239 /* Internal regulator request function */
1240 static struct regulator *_regulator_get(struct device *dev, const char *id,
1243 struct regulator_dev *rdev;
1244 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1245 const char *devname = NULL;
1249 pr_err("get() with no identifier\n");
1254 devname = dev_name(dev);
1256 mutex_lock(®ulator_list_mutex);
1258 rdev = regulator_dev_lookup(dev, id, &ret);
1263 * If we have return value from dev_lookup fail, we do not expect to
1264 * succeed, so, quit with appropriate error value
1267 regulator = ERR_PTR(ret);
1271 if (board_wants_dummy_regulator) {
1272 rdev = dummy_regulator_rdev;
1276 #ifdef CONFIG_REGULATOR_DUMMY
1278 devname = "deviceless";
1280 /* If the board didn't flag that it was fully constrained then
1281 * substitute in a dummy regulator so consumers can continue.
1283 if (!has_full_constraints) {
1284 pr_warn("%s supply %s not found, using dummy regulator\n",
1286 rdev = dummy_regulator_rdev;
1291 mutex_unlock(®ulator_list_mutex);
1295 if (rdev->exclusive) {
1296 regulator = ERR_PTR(-EPERM);
1300 if (exclusive && rdev->open_count) {
1301 regulator = ERR_PTR(-EBUSY);
1305 if (!try_module_get(rdev->owner))
1308 regulator = create_regulator(rdev, dev, id);
1309 if (regulator == NULL) {
1310 regulator = ERR_PTR(-ENOMEM);
1311 module_put(rdev->owner);
1317 rdev->exclusive = 1;
1319 ret = _regulator_is_enabled(rdev);
1321 rdev->use_count = 1;
1323 rdev->use_count = 0;
1327 mutex_unlock(®ulator_list_mutex);
1333 * regulator_get - lookup and obtain a reference to a regulator.
1334 * @dev: device for regulator "consumer"
1335 * @id: Supply name or regulator ID.
1337 * Returns a struct regulator corresponding to the regulator producer,
1338 * or IS_ERR() condition containing errno.
1340 * Use of supply names configured via regulator_set_device_supply() is
1341 * strongly encouraged. It is recommended that the supply name used
1342 * should match the name used for the supply and/or the relevant
1343 * device pins in the datasheet.
1345 struct regulator *regulator_get(struct device *dev, const char *id)
1347 return _regulator_get(dev, id, 0);
1349 EXPORT_SYMBOL_GPL(regulator_get);
1351 static void devm_regulator_release(struct device *dev, void *res)
1353 regulator_put(*(struct regulator **)res);
1357 * devm_regulator_get - Resource managed regulator_get()
1358 * @dev: device for regulator "consumer"
1359 * @id: Supply name or regulator ID.
1361 * Managed regulator_get(). Regulators returned from this function are
1362 * automatically regulator_put() on driver detach. See regulator_get() for more
1365 struct regulator *devm_regulator_get(struct device *dev, const char *id)
1367 struct regulator **ptr, *regulator;
1369 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1371 return ERR_PTR(-ENOMEM);
1373 regulator = regulator_get(dev, id);
1374 if (!IS_ERR(regulator)) {
1376 devres_add(dev, ptr);
1383 EXPORT_SYMBOL_GPL(devm_regulator_get);
1386 * regulator_get_exclusive - obtain exclusive access to a regulator.
1387 * @dev: device for regulator "consumer"
1388 * @id: Supply name or regulator ID.
1390 * Returns a struct regulator corresponding to the regulator producer,
1391 * or IS_ERR() condition containing errno. Other consumers will be
1392 * unable to obtain this reference is held and the use count for the
1393 * regulator will be initialised to reflect the current state of the
1396 * This is intended for use by consumers which cannot tolerate shared
1397 * use of the regulator such as those which need to force the
1398 * regulator off for correct operation of the hardware they are
1401 * Use of supply names configured via regulator_set_device_supply() is
1402 * strongly encouraged. It is recommended that the supply name used
1403 * should match the name used for the supply and/or the relevant
1404 * device pins in the datasheet.
1406 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1408 return _regulator_get(dev, id, 1);
1410 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1412 /* Locks held by regulator_put() */
1413 static void _regulator_put(struct regulator *regulator)
1415 struct regulator_dev *rdev;
1417 if (regulator == NULL || IS_ERR(regulator))
1420 rdev = regulator->rdev;
1422 debugfs_remove_recursive(regulator->debugfs);
1424 /* remove any sysfs entries */
1426 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1427 kfree(regulator->supply_name);
1428 list_del(®ulator->list);
1432 rdev->exclusive = 0;
1434 module_put(rdev->owner);
1438 * regulator_put - "free" the regulator source
1439 * @regulator: regulator source
1441 * Note: drivers must ensure that all regulator_enable calls made on this
1442 * regulator source are balanced by regulator_disable calls prior to calling
1445 void regulator_put(struct regulator *regulator)
1447 mutex_lock(®ulator_list_mutex);
1448 _regulator_put(regulator);
1449 mutex_unlock(®ulator_list_mutex);
1451 EXPORT_SYMBOL_GPL(regulator_put);
1453 static int devm_regulator_match(struct device *dev, void *res, void *data)
1455 struct regulator **r = res;
1464 * devm_regulator_put - Resource managed regulator_put()
1465 * @regulator: regulator to free
1467 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1468 * this function will not need to be called and the resource management
1469 * code will ensure that the resource is freed.
1471 void devm_regulator_put(struct regulator *regulator)
1475 rc = devres_release(regulator->dev, devm_regulator_release,
1476 devm_regulator_match, regulator);
1480 EXPORT_SYMBOL_GPL(devm_regulator_put);
1482 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1483 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1484 const struct regulator_config *config)
1486 struct regulator_enable_gpio *pin;
1489 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1490 if (pin->gpio == config->ena_gpio) {
1491 rdev_dbg(rdev, "GPIO %d is already used\n",
1493 goto update_ena_gpio_to_rdev;
1497 ret = gpio_request_one(config->ena_gpio,
1498 GPIOF_DIR_OUT | config->ena_gpio_flags,
1499 rdev_get_name(rdev));
1503 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1505 gpio_free(config->ena_gpio);
1509 pin->gpio = config->ena_gpio;
1510 pin->ena_gpio_invert = config->ena_gpio_invert;
1511 list_add(&pin->list, ®ulator_ena_gpio_list);
1513 update_ena_gpio_to_rdev:
1514 pin->request_count++;
1515 rdev->ena_pin = pin;
1519 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1521 struct regulator_enable_gpio *pin, *n;
1526 /* Free the GPIO only in case of no use */
1527 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
1528 if (pin->gpio == rdev->ena_pin->gpio) {
1529 if (pin->request_count <= 1) {
1530 pin->request_count = 0;
1531 gpio_free(pin->gpio);
1532 list_del(&pin->list);
1535 pin->request_count--;
1542 * Balance enable_count of each GPIO and actual GPIO pin control.
1543 * GPIO is enabled in case of initial use. (enable_count is 0)
1544 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1546 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1548 struct regulator_enable_gpio *pin = rdev->ena_pin;
1554 /* Enable GPIO at initial use */
1555 if (pin->enable_count == 0)
1556 gpio_set_value_cansleep(pin->gpio,
1557 !pin->ena_gpio_invert);
1559 pin->enable_count++;
1561 if (pin->enable_count > 1) {
1562 pin->enable_count--;
1566 /* Disable GPIO if not used */
1567 if (pin->enable_count <= 1) {
1568 gpio_set_value_cansleep(pin->gpio,
1569 pin->ena_gpio_invert);
1570 pin->enable_count = 0;
1577 static int _regulator_do_enable(struct regulator_dev *rdev)
1581 /* Query before enabling in case configuration dependent. */
1582 ret = _regulator_get_enable_time(rdev);
1586 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1590 trace_regulator_enable(rdev_get_name(rdev));
1592 if (rdev->ena_pin) {
1593 ret = regulator_ena_gpio_ctrl(rdev, true);
1596 rdev->ena_gpio_state = 1;
1597 } else if (rdev->desc->ops->enable) {
1598 ret = rdev->desc->ops->enable(rdev);
1605 /* Allow the regulator to ramp; it would be useful to extend
1606 * this for bulk operations so that the regulators can ramp
1608 trace_regulator_enable_delay(rdev_get_name(rdev));
1610 if (delay >= 1000) {
1611 mdelay(delay / 1000);
1612 udelay(delay % 1000);
1617 trace_regulator_enable_complete(rdev_get_name(rdev));
1622 /* locks held by regulator_enable() */
1623 static int _regulator_enable(struct regulator_dev *rdev)
1627 /* check voltage and requested load before enabling */
1628 if (rdev->constraints &&
1629 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1630 drms_uA_update(rdev);
1632 if (rdev->use_count == 0) {
1633 /* The regulator may on if it's not switchable or left on */
1634 ret = _regulator_is_enabled(rdev);
1635 if (ret == -EINVAL || ret == 0) {
1636 if (!_regulator_can_change_status(rdev))
1639 ret = _regulator_do_enable(rdev);
1643 } else if (ret < 0) {
1644 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1647 /* Fallthrough on positive return values - already enabled */
1656 * regulator_enable - enable regulator output
1657 * @regulator: regulator source
1659 * Request that the regulator be enabled with the regulator output at
1660 * the predefined voltage or current value. Calls to regulator_enable()
1661 * must be balanced with calls to regulator_disable().
1663 * NOTE: the output value can be set by other drivers, boot loader or may be
1664 * hardwired in the regulator.
1666 int regulator_enable(struct regulator *regulator)
1668 struct regulator_dev *rdev = regulator->rdev;
1671 if (regulator->always_on)
1675 ret = regulator_enable(rdev->supply);
1680 mutex_lock(&rdev->mutex);
1681 ret = _regulator_enable(rdev);
1682 mutex_unlock(&rdev->mutex);
1684 if (ret != 0 && rdev->supply)
1685 regulator_disable(rdev->supply);
1689 EXPORT_SYMBOL_GPL(regulator_enable);
1691 static int _regulator_do_disable(struct regulator_dev *rdev)
1695 trace_regulator_disable(rdev_get_name(rdev));
1697 if (rdev->ena_pin) {
1698 ret = regulator_ena_gpio_ctrl(rdev, false);
1701 rdev->ena_gpio_state = 0;
1703 } else if (rdev->desc->ops->disable) {
1704 ret = rdev->desc->ops->disable(rdev);
1709 trace_regulator_disable_complete(rdev_get_name(rdev));
1711 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1716 /* locks held by regulator_disable() */
1717 static int _regulator_disable(struct regulator_dev *rdev)
1721 if (WARN(rdev->use_count <= 0,
1722 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1725 /* are we the last user and permitted to disable ? */
1726 if (rdev->use_count == 1 &&
1727 (rdev->constraints && !rdev->constraints->always_on)) {
1729 /* we are last user */
1730 if (_regulator_can_change_status(rdev)) {
1731 ret = _regulator_do_disable(rdev);
1733 rdev_err(rdev, "failed to disable\n");
1738 rdev->use_count = 0;
1739 } else if (rdev->use_count > 1) {
1741 if (rdev->constraints &&
1742 (rdev->constraints->valid_ops_mask &
1743 REGULATOR_CHANGE_DRMS))
1744 drms_uA_update(rdev);
1753 * regulator_disable - disable regulator output
1754 * @regulator: regulator source
1756 * Disable the regulator output voltage or current. Calls to
1757 * regulator_enable() must be balanced with calls to
1758 * regulator_disable().
1760 * NOTE: this will only disable the regulator output if no other consumer
1761 * devices have it enabled, the regulator device supports disabling and
1762 * machine constraints permit this operation.
1764 int regulator_disable(struct regulator *regulator)
1766 struct regulator_dev *rdev = regulator->rdev;
1769 if (regulator->always_on)
1772 mutex_lock(&rdev->mutex);
1773 ret = _regulator_disable(rdev);
1774 mutex_unlock(&rdev->mutex);
1776 if (ret == 0 && rdev->supply)
1777 regulator_disable(rdev->supply);
1781 EXPORT_SYMBOL_GPL(regulator_disable);
1783 /* locks held by regulator_force_disable() */
1784 static int _regulator_force_disable(struct regulator_dev *rdev)
1789 if (rdev->desc->ops->disable) {
1790 /* ah well, who wants to live forever... */
1791 ret = rdev->desc->ops->disable(rdev);
1793 rdev_err(rdev, "failed to force disable\n");
1796 /* notify other consumers that power has been forced off */
1797 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1798 REGULATOR_EVENT_DISABLE, NULL);
1805 * regulator_force_disable - force disable regulator output
1806 * @regulator: regulator source
1808 * Forcibly disable the regulator output voltage or current.
1809 * NOTE: this *will* disable the regulator output even if other consumer
1810 * devices have it enabled. This should be used for situations when device
1811 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1813 int regulator_force_disable(struct regulator *regulator)
1815 struct regulator_dev *rdev = regulator->rdev;
1818 mutex_lock(&rdev->mutex);
1819 regulator->uA_load = 0;
1820 ret = _regulator_force_disable(regulator->rdev);
1821 mutex_unlock(&rdev->mutex);
1824 while (rdev->open_count--)
1825 regulator_disable(rdev->supply);
1829 EXPORT_SYMBOL_GPL(regulator_force_disable);
1831 static void regulator_disable_work(struct work_struct *work)
1833 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1837 mutex_lock(&rdev->mutex);
1839 BUG_ON(!rdev->deferred_disables);
1841 count = rdev->deferred_disables;
1842 rdev->deferred_disables = 0;
1844 for (i = 0; i < count; i++) {
1845 ret = _regulator_disable(rdev);
1847 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1850 mutex_unlock(&rdev->mutex);
1853 for (i = 0; i < count; i++) {
1854 ret = regulator_disable(rdev->supply);
1857 "Supply disable failed: %d\n", ret);
1864 * regulator_disable_deferred - disable regulator output with delay
1865 * @regulator: regulator source
1866 * @ms: miliseconds until the regulator is disabled
1868 * Execute regulator_disable() on the regulator after a delay. This
1869 * is intended for use with devices that require some time to quiesce.
1871 * NOTE: this will only disable the regulator output if no other consumer
1872 * devices have it enabled, the regulator device supports disabling and
1873 * machine constraints permit this operation.
1875 int regulator_disable_deferred(struct regulator *regulator, int ms)
1877 struct regulator_dev *rdev = regulator->rdev;
1880 if (regulator->always_on)
1884 return regulator_disable(regulator);
1886 mutex_lock(&rdev->mutex);
1887 rdev->deferred_disables++;
1888 mutex_unlock(&rdev->mutex);
1890 ret = schedule_delayed_work(&rdev->disable_work,
1891 msecs_to_jiffies(ms));
1897 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1900 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1902 * @rdev: regulator to operate on
1904 * Regulators that use regmap for their register I/O can set the
1905 * enable_reg and enable_mask fields in their descriptor and then use
1906 * this as their is_enabled operation, saving some code.
1908 int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1913 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1917 if (rdev->desc->enable_is_inverted)
1918 return (val & rdev->desc->enable_mask) == 0;
1920 return (val & rdev->desc->enable_mask) != 0;
1922 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1925 * regulator_enable_regmap - standard enable() for regmap users
1927 * @rdev: regulator to operate on
1929 * Regulators that use regmap for their register I/O can set the
1930 * enable_reg and enable_mask fields in their descriptor and then use
1931 * this as their enable() operation, saving some code.
1933 int regulator_enable_regmap(struct regulator_dev *rdev)
1937 if (rdev->desc->enable_is_inverted)
1940 val = rdev->desc->enable_mask;
1942 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1943 rdev->desc->enable_mask, val);
1945 EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1948 * regulator_disable_regmap - standard disable() for regmap users
1950 * @rdev: regulator to operate on
1952 * Regulators that use regmap for their register I/O can set the
1953 * enable_reg and enable_mask fields in their descriptor and then use
1954 * this as their disable() operation, saving some code.
1956 int regulator_disable_regmap(struct regulator_dev *rdev)
1960 if (rdev->desc->enable_is_inverted)
1961 val = rdev->desc->enable_mask;
1965 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1966 rdev->desc->enable_mask, val);
1968 EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1970 static int _regulator_is_enabled(struct regulator_dev *rdev)
1972 /* A GPIO control always takes precedence */
1974 return rdev->ena_gpio_state;
1976 /* If we don't know then assume that the regulator is always on */
1977 if (!rdev->desc->ops->is_enabled)
1980 return rdev->desc->ops->is_enabled(rdev);
1984 * regulator_is_enabled - is the regulator output enabled
1985 * @regulator: regulator source
1987 * Returns positive if the regulator driver backing the source/client
1988 * has requested that the device be enabled, zero if it hasn't, else a
1989 * negative errno code.
1991 * Note that the device backing this regulator handle can have multiple
1992 * users, so it might be enabled even if regulator_enable() was never
1993 * called for this particular source.
1995 int regulator_is_enabled(struct regulator *regulator)
1999 if (regulator->always_on)
2002 mutex_lock(®ulator->rdev->mutex);
2003 ret = _regulator_is_enabled(regulator->rdev);
2004 mutex_unlock(®ulator->rdev->mutex);
2008 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2011 * regulator_can_change_voltage - check if regulator can change voltage
2012 * @regulator: regulator source
2014 * Returns positive if the regulator driver backing the source/client
2015 * can change its voltage, false otherwise. Usefull for detecting fixed
2016 * or dummy regulators and disabling voltage change logic in the client
2019 int regulator_can_change_voltage(struct regulator *regulator)
2021 struct regulator_dev *rdev = regulator->rdev;
2023 if (rdev->constraints &&
2024 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2025 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2028 if (rdev->desc->continuous_voltage_range &&
2029 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2030 rdev->constraints->min_uV != rdev->constraints->max_uV)
2036 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2039 * regulator_count_voltages - count regulator_list_voltage() selectors
2040 * @regulator: regulator source
2042 * Returns number of selectors, or negative errno. Selectors are
2043 * numbered starting at zero, and typically correspond to bitfields
2044 * in hardware registers.
2046 int regulator_count_voltages(struct regulator *regulator)
2048 struct regulator_dev *rdev = regulator->rdev;
2050 return rdev->desc->n_voltages ? : -EINVAL;
2052 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2055 * regulator_list_voltage_linear - List voltages with simple calculation
2057 * @rdev: Regulator device
2058 * @selector: Selector to convert into a voltage
2060 * Regulators with a simple linear mapping between voltages and
2061 * selectors can set min_uV and uV_step in the regulator descriptor
2062 * and then use this function as their list_voltage() operation,
2064 int regulator_list_voltage_linear(struct regulator_dev *rdev,
2065 unsigned int selector)
2067 if (selector >= rdev->desc->n_voltages)
2069 if (selector < rdev->desc->linear_min_sel)
2072 selector -= rdev->desc->linear_min_sel;
2074 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
2076 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
2079 * regulator_list_voltage_table - List voltages with table based mapping
2081 * @rdev: Regulator device
2082 * @selector: Selector to convert into a voltage
2084 * Regulators with table based mapping between voltages and
2085 * selectors can set volt_table in the regulator descriptor
2086 * and then use this function as their list_voltage() operation.
2088 int regulator_list_voltage_table(struct regulator_dev *rdev,
2089 unsigned int selector)
2091 if (!rdev->desc->volt_table) {
2092 BUG_ON(!rdev->desc->volt_table);
2096 if (selector >= rdev->desc->n_voltages)
2099 return rdev->desc->volt_table[selector];
2101 EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
2104 * regulator_list_voltage - enumerate supported voltages
2105 * @regulator: regulator source
2106 * @selector: identify voltage to list
2107 * Context: can sleep
2109 * Returns a voltage that can be passed to @regulator_set_voltage(),
2110 * zero if this selector code can't be used on this system, or a
2113 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2115 struct regulator_dev *rdev = regulator->rdev;
2116 struct regulator_ops *ops = rdev->desc->ops;
2119 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
2122 mutex_lock(&rdev->mutex);
2123 ret = ops->list_voltage(rdev, selector);
2124 mutex_unlock(&rdev->mutex);
2127 if (ret < rdev->constraints->min_uV)
2129 else if (ret > rdev->constraints->max_uV)
2135 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2138 * regulator_is_supported_voltage - check if a voltage range can be supported
2140 * @regulator: Regulator to check.
2141 * @min_uV: Minimum required voltage in uV.
2142 * @max_uV: Maximum required voltage in uV.
2144 * Returns a boolean or a negative error code.
2146 int regulator_is_supported_voltage(struct regulator *regulator,
2147 int min_uV, int max_uV)
2149 struct regulator_dev *rdev = regulator->rdev;
2150 int i, voltages, ret;
2152 /* If we can't change voltage check the current voltage */
2153 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2154 ret = regulator_get_voltage(regulator);
2156 return (min_uV <= ret && ret <= max_uV);
2161 /* Any voltage within constrains range is fine? */
2162 if (rdev->desc->continuous_voltage_range)
2163 return min_uV >= rdev->constraints->min_uV &&
2164 max_uV <= rdev->constraints->max_uV;
2166 ret = regulator_count_voltages(regulator);
2171 for (i = 0; i < voltages; i++) {
2172 ret = regulator_list_voltage(regulator, i);
2174 if (ret >= min_uV && ret <= max_uV)
2180 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2183 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2185 * @rdev: regulator to operate on
2187 * Regulators that use regmap for their register I/O can set the
2188 * vsel_reg and vsel_mask fields in their descriptor and then use this
2189 * as their get_voltage_vsel operation, saving some code.
2191 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
2196 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
2200 val &= rdev->desc->vsel_mask;
2201 val >>= ffs(rdev->desc->vsel_mask) - 1;
2205 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
2208 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2210 * @rdev: regulator to operate on
2211 * @sel: Selector to set
2213 * Regulators that use regmap for their register I/O can set the
2214 * vsel_reg and vsel_mask fields in their descriptor and then use this
2215 * as their set_voltage_vsel operation, saving some code.
2217 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
2221 sel <<= ffs(rdev->desc->vsel_mask) - 1;
2223 ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
2224 rdev->desc->vsel_mask, sel);
2228 if (rdev->desc->apply_bit)
2229 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
2230 rdev->desc->apply_bit,
2231 rdev->desc->apply_bit);
2234 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
2237 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2239 * @rdev: Regulator to operate on
2240 * @min_uV: Lower bound for voltage
2241 * @max_uV: Upper bound for voltage
2243 * Drivers implementing set_voltage_sel() and list_voltage() can use
2244 * this as their map_voltage() operation. It will find a suitable
2245 * voltage by calling list_voltage() until it gets something in bounds
2246 * for the requested voltages.
2248 int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2249 int min_uV, int max_uV)
2251 int best_val = INT_MAX;
2255 /* Find the smallest voltage that falls within the specified
2258 for (i = 0; i < rdev->desc->n_voltages; i++) {
2259 ret = rdev->desc->ops->list_voltage(rdev, i);
2263 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2269 if (best_val != INT_MAX)
2274 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2277 * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
2279 * @rdev: Regulator to operate on
2280 * @min_uV: Lower bound for voltage
2281 * @max_uV: Upper bound for voltage
2283 * Drivers that have ascendant voltage list can use this as their
2284 * map_voltage() operation.
2286 int regulator_map_voltage_ascend(struct regulator_dev *rdev,
2287 int min_uV, int max_uV)
2291 for (i = 0; i < rdev->desc->n_voltages; i++) {
2292 ret = rdev->desc->ops->list_voltage(rdev, i);
2299 if (ret >= min_uV && ret <= max_uV)
2305 EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend);
2308 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2310 * @rdev: Regulator to operate on
2311 * @min_uV: Lower bound for voltage
2312 * @max_uV: Upper bound for voltage
2314 * Drivers providing min_uV and uV_step in their regulator_desc can
2315 * use this as their map_voltage() operation.
2317 int regulator_map_voltage_linear(struct regulator_dev *rdev,
2318 int min_uV, int max_uV)
2322 /* Allow uV_step to be 0 for fixed voltage */
2323 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
2324 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
2330 if (!rdev->desc->uV_step) {
2331 BUG_ON(!rdev->desc->uV_step);
2335 if (min_uV < rdev->desc->min_uV)
2336 min_uV = rdev->desc->min_uV;
2338 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
2342 ret += rdev->desc->linear_min_sel;
2344 /* Map back into a voltage to verify we're still in bounds */
2345 voltage = rdev->desc->ops->list_voltage(rdev, ret);
2346 if (voltage < min_uV || voltage > max_uV)
2351 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2353 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2354 int min_uV, int max_uV)
2359 unsigned int selector;
2360 int old_selector = -1;
2362 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2364 min_uV += rdev->constraints->uV_offset;
2365 max_uV += rdev->constraints->uV_offset;
2368 * If we can't obtain the old selector there is not enough
2369 * info to call set_voltage_time_sel().
2371 if (_regulator_is_enabled(rdev) &&
2372 rdev->desc->ops->set_voltage_time_sel &&
2373 rdev->desc->ops->get_voltage_sel) {
2374 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2375 if (old_selector < 0)
2376 return old_selector;
2379 if (rdev->desc->ops->set_voltage) {
2380 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2384 if (rdev->desc->ops->list_voltage)
2385 best_val = rdev->desc->ops->list_voltage(rdev,
2388 best_val = _regulator_get_voltage(rdev);
2391 } else if (rdev->desc->ops->set_voltage_sel) {
2392 if (rdev->desc->ops->map_voltage) {
2393 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2396 if (rdev->desc->ops->list_voltage ==
2397 regulator_list_voltage_linear)
2398 ret = regulator_map_voltage_linear(rdev,
2401 ret = regulator_map_voltage_iterate(rdev,
2406 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2407 if (min_uV <= best_val && max_uV >= best_val) {
2409 if (old_selector == selector)
2412 ret = rdev->desc->ops->set_voltage_sel(
2422 /* Call set_voltage_time_sel if successfully obtained old_selector */
2423 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
2424 old_selector != selector && rdev->desc->ops->set_voltage_time_sel) {
2426 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2427 old_selector, selector);
2429 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2434 /* Insert any necessary delays */
2435 if (delay >= 1000) {
2436 mdelay(delay / 1000);
2437 udelay(delay % 1000);
2443 if (ret == 0 && best_val >= 0) {
2444 unsigned long data = best_val;
2446 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2450 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2456 * regulator_set_voltage - set regulator output voltage
2457 * @regulator: regulator source
2458 * @min_uV: Minimum required voltage in uV
2459 * @max_uV: Maximum acceptable voltage in uV
2461 * Sets a voltage regulator to the desired output voltage. This can be set
2462 * during any regulator state. IOW, regulator can be disabled or enabled.
2464 * If the regulator is enabled then the voltage will change to the new value
2465 * immediately otherwise if the regulator is disabled the regulator will
2466 * output at the new voltage when enabled.
2468 * NOTE: If the regulator is shared between several devices then the lowest
2469 * request voltage that meets the system constraints will be used.
2470 * Regulator system constraints must be set for this regulator before
2471 * calling this function otherwise this call will fail.
2473 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2475 struct regulator_dev *rdev = regulator->rdev;
2477 int old_min_uV, old_max_uV;
2479 mutex_lock(&rdev->mutex);
2481 /* If we're setting the same range as last time the change
2482 * should be a noop (some cpufreq implementations use the same
2483 * voltage for multiple frequencies, for example).
2485 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2489 if (!rdev->desc->ops->set_voltage &&
2490 !rdev->desc->ops->set_voltage_sel) {
2495 /* constraints check */
2496 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2500 /* restore original values in case of error */
2501 old_min_uV = regulator->min_uV;
2502 old_max_uV = regulator->max_uV;
2503 regulator->min_uV = min_uV;
2504 regulator->max_uV = max_uV;
2506 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2510 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2515 mutex_unlock(&rdev->mutex);
2518 regulator->min_uV = old_min_uV;
2519 regulator->max_uV = old_max_uV;
2520 mutex_unlock(&rdev->mutex);
2523 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2526 * regulator_set_voltage_time - get raise/fall time
2527 * @regulator: regulator source
2528 * @old_uV: starting voltage in microvolts
2529 * @new_uV: target voltage in microvolts
2531 * Provided with the starting and ending voltage, this function attempts to
2532 * calculate the time in microseconds required to rise or fall to this new
2535 int regulator_set_voltage_time(struct regulator *regulator,
2536 int old_uV, int new_uV)
2538 struct regulator_dev *rdev = regulator->rdev;
2539 struct regulator_ops *ops = rdev->desc->ops;
2545 /* Currently requires operations to do this */
2546 if (!ops->list_voltage || !ops->set_voltage_time_sel
2547 || !rdev->desc->n_voltages)
2550 for (i = 0; i < rdev->desc->n_voltages; i++) {
2551 /* We only look for exact voltage matches here */
2552 voltage = regulator_list_voltage(regulator, i);
2557 if (voltage == old_uV)
2559 if (voltage == new_uV)
2563 if (old_sel < 0 || new_sel < 0)
2566 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2568 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2571 * regulator_set_voltage_time_sel - get raise/fall time
2572 * @rdev: regulator source device
2573 * @old_selector: selector for starting voltage
2574 * @new_selector: selector for target voltage
2576 * Provided with the starting and target voltage selectors, this function
2577 * returns time in microseconds required to rise or fall to this new voltage
2579 * Drivers providing ramp_delay in regulation_constraints can use this as their
2580 * set_voltage_time_sel() operation.
2582 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2583 unsigned int old_selector,
2584 unsigned int new_selector)
2586 unsigned int ramp_delay = 0;
2587 int old_volt, new_volt;
2589 if (rdev->constraints->ramp_delay)
2590 ramp_delay = rdev->constraints->ramp_delay;
2591 else if (rdev->desc->ramp_delay)
2592 ramp_delay = rdev->desc->ramp_delay;
2594 if (ramp_delay == 0) {
2595 rdev_warn(rdev, "ramp_delay not set\n");
2600 if (!rdev->desc->ops->list_voltage)
2603 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2604 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2606 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2608 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2611 * regulator_sync_voltage - re-apply last regulator output voltage
2612 * @regulator: regulator source
2614 * Re-apply the last configured voltage. This is intended to be used
2615 * where some external control source the consumer is cooperating with
2616 * has caused the configured voltage to change.
2618 int regulator_sync_voltage(struct regulator *regulator)
2620 struct regulator_dev *rdev = regulator->rdev;
2621 int ret, min_uV, max_uV;
2623 mutex_lock(&rdev->mutex);
2625 if (!rdev->desc->ops->set_voltage &&
2626 !rdev->desc->ops->set_voltage_sel) {
2631 /* This is only going to work if we've had a voltage configured. */
2632 if (!regulator->min_uV && !regulator->max_uV) {
2637 min_uV = regulator->min_uV;
2638 max_uV = regulator->max_uV;
2640 /* This should be a paranoia check... */
2641 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2645 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2649 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2652 mutex_unlock(&rdev->mutex);
2655 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2657 static int _regulator_get_voltage(struct regulator_dev *rdev)
2661 if (rdev->desc->ops->get_voltage_sel) {
2662 sel = rdev->desc->ops->get_voltage_sel(rdev);
2665 ret = rdev->desc->ops->list_voltage(rdev, sel);
2666 } else if (rdev->desc->ops->get_voltage) {
2667 ret = rdev->desc->ops->get_voltage(rdev);
2668 } else if (rdev->desc->ops->list_voltage) {
2669 ret = rdev->desc->ops->list_voltage(rdev, 0);
2676 return ret - rdev->constraints->uV_offset;
2680 * regulator_get_voltage - get regulator output voltage
2681 * @regulator: regulator source
2683 * This returns the current regulator voltage in uV.
2685 * NOTE: If the regulator is disabled it will return the voltage value. This
2686 * function should not be used to determine regulator state.
2688 int regulator_get_voltage(struct regulator *regulator)
2692 mutex_lock(®ulator->rdev->mutex);
2694 ret = _regulator_get_voltage(regulator->rdev);
2696 mutex_unlock(®ulator->rdev->mutex);
2700 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2703 * regulator_set_current_limit - set regulator output current limit
2704 * @regulator: regulator source
2705 * @min_uA: Minimuum supported current in uA
2706 * @max_uA: Maximum supported current in uA
2708 * Sets current sink to the desired output current. This can be set during
2709 * any regulator state. IOW, regulator can be disabled or enabled.
2711 * If the regulator is enabled then the current will change to the new value
2712 * immediately otherwise if the regulator is disabled the regulator will
2713 * output at the new current when enabled.
2715 * NOTE: Regulator system constraints must be set for this regulator before
2716 * calling this function otherwise this call will fail.
2718 int regulator_set_current_limit(struct regulator *regulator,
2719 int min_uA, int max_uA)
2721 struct regulator_dev *rdev = regulator->rdev;
2724 mutex_lock(&rdev->mutex);
2727 if (!rdev->desc->ops->set_current_limit) {
2732 /* constraints check */
2733 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2737 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2739 mutex_unlock(&rdev->mutex);
2742 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2744 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2748 mutex_lock(&rdev->mutex);
2751 if (!rdev->desc->ops->get_current_limit) {
2756 ret = rdev->desc->ops->get_current_limit(rdev);
2758 mutex_unlock(&rdev->mutex);
2763 * regulator_get_current_limit - get regulator output current
2764 * @regulator: regulator source
2766 * This returns the current supplied by the specified current sink in uA.
2768 * NOTE: If the regulator is disabled it will return the current value. This
2769 * function should not be used to determine regulator state.
2771 int regulator_get_current_limit(struct regulator *regulator)
2773 return _regulator_get_current_limit(regulator->rdev);
2775 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2778 * regulator_set_mode - set regulator operating mode
2779 * @regulator: regulator source
2780 * @mode: operating mode - one of the REGULATOR_MODE constants
2782 * Set regulator operating mode to increase regulator efficiency or improve
2783 * regulation performance.
2785 * NOTE: Regulator system constraints must be set for this regulator before
2786 * calling this function otherwise this call will fail.
2788 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2790 struct regulator_dev *rdev = regulator->rdev;
2792 int regulator_curr_mode;
2794 mutex_lock(&rdev->mutex);
2797 if (!rdev->desc->ops->set_mode) {
2802 /* return if the same mode is requested */
2803 if (rdev->desc->ops->get_mode) {
2804 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2805 if (regulator_curr_mode == mode) {
2811 /* constraints check */
2812 ret = regulator_mode_constrain(rdev, &mode);
2816 ret = rdev->desc->ops->set_mode(rdev, mode);
2818 mutex_unlock(&rdev->mutex);
2821 EXPORT_SYMBOL_GPL(regulator_set_mode);
2823 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2827 mutex_lock(&rdev->mutex);
2830 if (!rdev->desc->ops->get_mode) {
2835 ret = rdev->desc->ops->get_mode(rdev);
2837 mutex_unlock(&rdev->mutex);
2842 * regulator_get_mode - get regulator operating mode
2843 * @regulator: regulator source
2845 * Get the current regulator operating mode.
2847 unsigned int regulator_get_mode(struct regulator *regulator)
2849 return _regulator_get_mode(regulator->rdev);
2851 EXPORT_SYMBOL_GPL(regulator_get_mode);
2854 * regulator_set_optimum_mode - set regulator optimum operating mode
2855 * @regulator: regulator source
2856 * @uA_load: load current
2858 * Notifies the regulator core of a new device load. This is then used by
2859 * DRMS (if enabled by constraints) to set the most efficient regulator
2860 * operating mode for the new regulator loading.
2862 * Consumer devices notify their supply regulator of the maximum power
2863 * they will require (can be taken from device datasheet in the power
2864 * consumption tables) when they change operational status and hence power
2865 * state. Examples of operational state changes that can affect power
2866 * consumption are :-
2868 * o Device is opened / closed.
2869 * o Device I/O is about to begin or has just finished.
2870 * o Device is idling in between work.
2872 * This information is also exported via sysfs to userspace.
2874 * DRMS will sum the total requested load on the regulator and change
2875 * to the most efficient operating mode if platform constraints allow.
2877 * Returns the new regulator mode or error.
2879 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2881 struct regulator_dev *rdev = regulator->rdev;
2882 struct regulator *consumer;
2883 int ret, output_uV, input_uV = 0, total_uA_load = 0;
2887 input_uV = regulator_get_voltage(rdev->supply);
2889 mutex_lock(&rdev->mutex);
2892 * first check to see if we can set modes at all, otherwise just
2893 * tell the consumer everything is OK.
2895 regulator->uA_load = uA_load;
2896 ret = regulator_check_drms(rdev);
2902 if (!rdev->desc->ops->get_optimum_mode)
2906 * we can actually do this so any errors are indicators of
2907 * potential real failure.
2911 if (!rdev->desc->ops->set_mode)
2914 /* get output voltage */
2915 output_uV = _regulator_get_voltage(rdev);
2916 if (output_uV <= 0) {
2917 rdev_err(rdev, "invalid output voltage found\n");
2921 /* No supply? Use constraint voltage */
2923 input_uV = rdev->constraints->input_uV;
2924 if (input_uV <= 0) {
2925 rdev_err(rdev, "invalid input voltage found\n");
2929 /* calc total requested load for this regulator */
2930 list_for_each_entry(consumer, &rdev->consumer_list, list)
2931 total_uA_load += consumer->uA_load;
2933 mode = rdev->desc->ops->get_optimum_mode(rdev,
2934 input_uV, output_uV,
2936 ret = regulator_mode_constrain(rdev, &mode);
2938 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2939 total_uA_load, input_uV, output_uV);
2943 ret = rdev->desc->ops->set_mode(rdev, mode);
2945 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2950 mutex_unlock(&rdev->mutex);
2953 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2956 * regulator_set_bypass_regmap - Default set_bypass() using regmap
2958 * @rdev: device to operate on.
2959 * @enable: state to set.
2961 int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
2966 val = rdev->desc->bypass_mask;
2970 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
2971 rdev->desc->bypass_mask, val);
2973 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
2976 * regulator_get_bypass_regmap - Default get_bypass() using regmap
2978 * @rdev: device to operate on.
2979 * @enable: current state.
2981 int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
2986 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
2990 *enable = val & rdev->desc->bypass_mask;
2994 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
2997 * regulator_allow_bypass - allow the regulator to go into bypass mode
2999 * @regulator: Regulator to configure
3000 * @enable: enable or disable bypass mode
3002 * Allow the regulator to go into bypass mode if all other consumers
3003 * for the regulator also enable bypass mode and the machine
3004 * constraints allow this. Bypass mode means that the regulator is
3005 * simply passing the input directly to the output with no regulation.
3007 int regulator_allow_bypass(struct regulator *regulator, bool enable)
3009 struct regulator_dev *rdev = regulator->rdev;
3012 if (!rdev->desc->ops->set_bypass)
3015 if (rdev->constraints &&
3016 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3019 mutex_lock(&rdev->mutex);
3021 if (enable && !regulator->bypass) {
3022 rdev->bypass_count++;
3024 if (rdev->bypass_count == rdev->open_count) {
3025 ret = rdev->desc->ops->set_bypass(rdev, enable);
3027 rdev->bypass_count--;
3030 } else if (!enable && regulator->bypass) {
3031 rdev->bypass_count--;
3033 if (rdev->bypass_count != rdev->open_count) {
3034 ret = rdev->desc->ops->set_bypass(rdev, enable);
3036 rdev->bypass_count++;
3041 regulator->bypass = enable;
3043 mutex_unlock(&rdev->mutex);
3047 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3050 * regulator_register_notifier - register regulator event notifier
3051 * @regulator: regulator source
3052 * @nb: notifier block
3054 * Register notifier block to receive regulator events.
3056 int regulator_register_notifier(struct regulator *regulator,
3057 struct notifier_block *nb)
3059 return blocking_notifier_chain_register(®ulator->rdev->notifier,
3062 EXPORT_SYMBOL_GPL(regulator_register_notifier);
3065 * regulator_unregister_notifier - unregister regulator event notifier
3066 * @regulator: regulator source
3067 * @nb: notifier block
3069 * Unregister regulator event notifier block.
3071 int regulator_unregister_notifier(struct regulator *regulator,
3072 struct notifier_block *nb)
3074 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
3077 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3079 /* notify regulator consumers and downstream regulator consumers.
3080 * Note mutex must be held by caller.
3082 static void _notifier_call_chain(struct regulator_dev *rdev,
3083 unsigned long event, void *data)
3085 /* call rdev chain first */
3086 blocking_notifier_call_chain(&rdev->notifier, event, data);
3090 * regulator_bulk_get - get multiple regulator consumers
3092 * @dev: Device to supply
3093 * @num_consumers: Number of consumers to register
3094 * @consumers: Configuration of consumers; clients are stored here.
3096 * @return 0 on success, an errno on failure.
3098 * This helper function allows drivers to get several regulator
3099 * consumers in one operation. If any of the regulators cannot be
3100 * acquired then any regulators that were allocated will be freed
3101 * before returning to the caller.
3103 int regulator_bulk_get(struct device *dev, int num_consumers,
3104 struct regulator_bulk_data *consumers)
3109 for (i = 0; i < num_consumers; i++)
3110 consumers[i].consumer = NULL;
3112 for (i = 0; i < num_consumers; i++) {
3113 consumers[i].consumer = regulator_get(dev,
3114 consumers[i].supply);
3115 if (IS_ERR(consumers[i].consumer)) {
3116 ret = PTR_ERR(consumers[i].consumer);
3117 dev_err(dev, "Failed to get supply '%s': %d\n",
3118 consumers[i].supply, ret);
3119 consumers[i].consumer = NULL;
3128 regulator_put(consumers[i].consumer);
3132 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3135 * devm_regulator_bulk_get - managed get multiple regulator consumers
3137 * @dev: Device to supply
3138 * @num_consumers: Number of consumers to register
3139 * @consumers: Configuration of consumers; clients are stored here.
3141 * @return 0 on success, an errno on failure.
3143 * This helper function allows drivers to get several regulator
3144 * consumers in one operation with management, the regulators will
3145 * automatically be freed when the device is unbound. If any of the
3146 * regulators cannot be acquired then any regulators that were
3147 * allocated will be freed before returning to the caller.
3149 int devm_regulator_bulk_get(struct device *dev, int num_consumers,
3150 struct regulator_bulk_data *consumers)
3155 for (i = 0; i < num_consumers; i++)
3156 consumers[i].consumer = NULL;
3158 for (i = 0; i < num_consumers; i++) {
3159 consumers[i].consumer = devm_regulator_get(dev,
3160 consumers[i].supply);
3161 if (IS_ERR(consumers[i].consumer)) {
3162 ret = PTR_ERR(consumers[i].consumer);
3163 dev_err(dev, "Failed to get supply '%s': %d\n",
3164 consumers[i].supply, ret);
3165 consumers[i].consumer = NULL;
3173 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
3174 devm_regulator_put(consumers[i].consumer);
3178 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
3180 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3182 struct regulator_bulk_data *bulk = data;
3184 bulk->ret = regulator_enable(bulk->consumer);
3188 * regulator_bulk_enable - enable multiple regulator consumers
3190 * @num_consumers: Number of consumers
3191 * @consumers: Consumer data; clients are stored here.
3192 * @return 0 on success, an errno on failure
3194 * This convenience API allows consumers to enable multiple regulator
3195 * clients in a single API call. If any consumers cannot be enabled
3196 * then any others that were enabled will be disabled again prior to
3199 int regulator_bulk_enable(int num_consumers,
3200 struct regulator_bulk_data *consumers)
3202 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3206 for (i = 0; i < num_consumers; i++) {
3207 if (consumers[i].consumer->always_on)
3208 consumers[i].ret = 0;
3210 async_schedule_domain(regulator_bulk_enable_async,
3211 &consumers[i], &async_domain);
3214 async_synchronize_full_domain(&async_domain);
3216 /* If any consumer failed we need to unwind any that succeeded */
3217 for (i = 0; i < num_consumers; i++) {
3218 if (consumers[i].ret != 0) {
3219 ret = consumers[i].ret;
3227 for (i = 0; i < num_consumers; i++) {
3228 if (consumers[i].ret < 0)
3229 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3232 regulator_disable(consumers[i].consumer);
3237 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3240 * regulator_bulk_disable - disable multiple regulator consumers
3242 * @num_consumers: Number of consumers
3243 * @consumers: Consumer data; clients are stored here.
3244 * @return 0 on success, an errno on failure
3246 * This convenience API allows consumers to disable multiple regulator
3247 * clients in a single API call. If any consumers cannot be disabled
3248 * then any others that were disabled will be enabled again prior to
3251 int regulator_bulk_disable(int num_consumers,
3252 struct regulator_bulk_data *consumers)
3257 for (i = num_consumers - 1; i >= 0; --i) {
3258 ret = regulator_disable(consumers[i].consumer);
3266 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3267 for (++i; i < num_consumers; ++i) {
3268 r = regulator_enable(consumers[i].consumer);
3270 pr_err("Failed to reename %s: %d\n",
3271 consumers[i].supply, r);
3276 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3279 * regulator_bulk_force_disable - force disable multiple regulator consumers
3281 * @num_consumers: Number of consumers
3282 * @consumers: Consumer data; clients are stored here.
3283 * @return 0 on success, an errno on failure
3285 * This convenience API allows consumers to forcibly disable multiple regulator
3286 * clients in a single API call.
3287 * NOTE: This should be used for situations when device damage will
3288 * likely occur if the regulators are not disabled (e.g. over temp).
3289 * Although regulator_force_disable function call for some consumers can
3290 * return error numbers, the function is called for all consumers.
3292 int regulator_bulk_force_disable(int num_consumers,
3293 struct regulator_bulk_data *consumers)
3298 for (i = 0; i < num_consumers; i++)
3300 regulator_force_disable(consumers[i].consumer);
3302 for (i = 0; i < num_consumers; i++) {
3303 if (consumers[i].ret != 0) {
3304 ret = consumers[i].ret;
3313 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3316 * regulator_bulk_free - free multiple regulator consumers
3318 * @num_consumers: Number of consumers
3319 * @consumers: Consumer data; clients are stored here.
3321 * This convenience API allows consumers to free multiple regulator
3322 * clients in a single API call.
3324 void regulator_bulk_free(int num_consumers,
3325 struct regulator_bulk_data *consumers)
3329 for (i = 0; i < num_consumers; i++) {
3330 regulator_put(consumers[i].consumer);
3331 consumers[i].consumer = NULL;
3334 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3337 * regulator_notifier_call_chain - call regulator event notifier
3338 * @rdev: regulator source
3339 * @event: notifier block
3340 * @data: callback-specific data.
3342 * Called by regulator drivers to notify clients a regulator event has
3343 * occurred. We also notify regulator clients downstream.
3344 * Note lock must be held by caller.
3346 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3347 unsigned long event, void *data)
3349 _notifier_call_chain(rdev, event, data);
3353 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3356 * regulator_mode_to_status - convert a regulator mode into a status
3358 * @mode: Mode to convert
3360 * Convert a regulator mode into a status.
3362 int regulator_mode_to_status(unsigned int mode)
3365 case REGULATOR_MODE_FAST:
3366 return REGULATOR_STATUS_FAST;
3367 case REGULATOR_MODE_NORMAL:
3368 return REGULATOR_STATUS_NORMAL;
3369 case REGULATOR_MODE_IDLE:
3370 return REGULATOR_STATUS_IDLE;
3371 case REGULATOR_MODE_STANDBY:
3372 return REGULATOR_STATUS_STANDBY;
3374 return REGULATOR_STATUS_UNDEFINED;
3377 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3380 * To avoid cluttering sysfs (and memory) with useless state, only
3381 * create attributes that can be meaningfully displayed.
3383 static int add_regulator_attributes(struct regulator_dev *rdev)
3385 struct device *dev = &rdev->dev;
3386 struct regulator_ops *ops = rdev->desc->ops;
3389 /* some attributes need specific methods to be displayed */
3390 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3391 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3392 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) {
3393 status = device_create_file(dev, &dev_attr_microvolts);
3397 if (ops->get_current_limit) {
3398 status = device_create_file(dev, &dev_attr_microamps);
3402 if (ops->get_mode) {
3403 status = device_create_file(dev, &dev_attr_opmode);
3407 if (rdev->ena_pin || ops->is_enabled) {
3408 status = device_create_file(dev, &dev_attr_state);
3412 if (ops->get_status) {
3413 status = device_create_file(dev, &dev_attr_status);
3417 if (ops->get_bypass) {
3418 status = device_create_file(dev, &dev_attr_bypass);
3423 /* some attributes are type-specific */
3424 if (rdev->desc->type == REGULATOR_CURRENT) {
3425 status = device_create_file(dev, &dev_attr_requested_microamps);
3430 /* all the other attributes exist to support constraints;
3431 * don't show them if there are no constraints, or if the
3432 * relevant supporting methods are missing.
3434 if (!rdev->constraints)
3437 /* constraints need specific supporting methods */
3438 if (ops->set_voltage || ops->set_voltage_sel) {
3439 status = device_create_file(dev, &dev_attr_min_microvolts);
3442 status = device_create_file(dev, &dev_attr_max_microvolts);
3446 if (ops->set_current_limit) {
3447 status = device_create_file(dev, &dev_attr_min_microamps);
3450 status = device_create_file(dev, &dev_attr_max_microamps);
3455 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3458 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3461 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3465 if (ops->set_suspend_voltage) {
3466 status = device_create_file(dev,
3467 &dev_attr_suspend_standby_microvolts);
3470 status = device_create_file(dev,
3471 &dev_attr_suspend_mem_microvolts);
3474 status = device_create_file(dev,
3475 &dev_attr_suspend_disk_microvolts);
3480 if (ops->set_suspend_mode) {
3481 status = device_create_file(dev,
3482 &dev_attr_suspend_standby_mode);
3485 status = device_create_file(dev,
3486 &dev_attr_suspend_mem_mode);
3489 status = device_create_file(dev,
3490 &dev_attr_suspend_disk_mode);
3498 static void rdev_init_debugfs(struct regulator_dev *rdev)
3500 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3501 if (!rdev->debugfs) {
3502 rdev_warn(rdev, "Failed to create debugfs directory\n");
3506 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3508 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3510 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3511 &rdev->bypass_count);
3515 * regulator_register - register regulator
3516 * @regulator_desc: regulator to register
3517 * @config: runtime configuration for regulator
3519 * Called by regulator drivers to register a regulator.
3520 * Returns a valid pointer to struct regulator_dev on success
3521 * or an ERR_PTR() on error.
3523 struct regulator_dev *
3524 regulator_register(const struct regulator_desc *regulator_desc,
3525 const struct regulator_config *config)
3527 const struct regulation_constraints *constraints = NULL;
3528 const struct regulator_init_data *init_data;
3529 static atomic_t regulator_no = ATOMIC_INIT(0);
3530 struct regulator_dev *rdev;
3533 const char *supply = NULL;
3535 if (regulator_desc == NULL || config == NULL)
3536 return ERR_PTR(-EINVAL);
3541 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3542 return ERR_PTR(-EINVAL);
3544 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3545 regulator_desc->type != REGULATOR_CURRENT)
3546 return ERR_PTR(-EINVAL);
3548 /* Only one of each should be implemented */
3549 WARN_ON(regulator_desc->ops->get_voltage &&
3550 regulator_desc->ops->get_voltage_sel);
3551 WARN_ON(regulator_desc->ops->set_voltage &&
3552 regulator_desc->ops->set_voltage_sel);
3554 /* If we're using selectors we must implement list_voltage. */
3555 if (regulator_desc->ops->get_voltage_sel &&
3556 !regulator_desc->ops->list_voltage) {
3557 return ERR_PTR(-EINVAL);
3559 if (regulator_desc->ops->set_voltage_sel &&
3560 !regulator_desc->ops->list_voltage) {
3561 return ERR_PTR(-EINVAL);
3564 init_data = config->init_data;
3566 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3568 return ERR_PTR(-ENOMEM);
3570 mutex_lock(®ulator_list_mutex);
3572 mutex_init(&rdev->mutex);
3573 rdev->reg_data = config->driver_data;
3574 rdev->owner = regulator_desc->owner;
3575 rdev->desc = regulator_desc;
3577 rdev->regmap = config->regmap;
3578 else if (dev_get_regmap(dev, NULL))
3579 rdev->regmap = dev_get_regmap(dev, NULL);
3580 else if (dev->parent)
3581 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3582 INIT_LIST_HEAD(&rdev->consumer_list);
3583 INIT_LIST_HEAD(&rdev->list);
3584 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3585 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3587 /* preform any regulator specific init */
3588 if (init_data && init_data->regulator_init) {
3589 ret = init_data->regulator_init(rdev->reg_data);
3594 /* register with sysfs */
3595 rdev->dev.class = ®ulator_class;
3596 rdev->dev.of_node = config->of_node;
3597 rdev->dev.parent = dev;
3598 dev_set_name(&rdev->dev, "regulator.%d",
3599 atomic_inc_return(®ulator_no) - 1);
3600 ret = device_register(&rdev->dev);
3602 put_device(&rdev->dev);
3606 dev_set_drvdata(&rdev->dev, rdev);
3608 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3609 ret = regulator_ena_gpio_request(rdev, config);
3611 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3612 config->ena_gpio, ret);
3616 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3617 rdev->ena_gpio_state = 1;
3619 if (config->ena_gpio_invert)
3620 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3623 /* set regulator constraints */
3625 constraints = &init_data->constraints;
3627 ret = set_machine_constraints(rdev, constraints);
3631 /* add attributes supported by this regulator */
3632 ret = add_regulator_attributes(rdev);
3636 if (init_data && init_data->supply_regulator)
3637 supply = init_data->supply_regulator;
3638 else if (regulator_desc->supply_name)
3639 supply = regulator_desc->supply_name;
3642 struct regulator_dev *r;
3644 r = regulator_dev_lookup(dev, supply, &ret);
3646 if (ret == -ENODEV) {
3648 * No supply was specified for this regulator and
3649 * there will never be one.
3654 dev_err(dev, "Failed to find supply %s\n", supply);
3655 ret = -EPROBE_DEFER;
3659 ret = set_supply(rdev, r);
3663 /* Enable supply if rail is enabled */
3664 if (_regulator_is_enabled(rdev)) {
3665 ret = regulator_enable(rdev->supply);
3672 /* add consumers devices */
3674 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3675 ret = set_consumer_device_supply(rdev,
3676 init_data->consumer_supplies[i].dev_name,
3677 init_data->consumer_supplies[i].supply);
3679 dev_err(dev, "Failed to set supply %s\n",
3680 init_data->consumer_supplies[i].supply);
3681 goto unset_supplies;
3686 list_add(&rdev->list, ®ulator_list);
3688 rdev_init_debugfs(rdev);
3690 mutex_unlock(®ulator_list_mutex);
3694 unset_regulator_supplies(rdev);
3698 _regulator_put(rdev->supply);
3699 regulator_ena_gpio_free(rdev);
3700 kfree(rdev->constraints);
3702 device_unregister(&rdev->dev);
3703 /* device core frees rdev */
3704 rdev = ERR_PTR(ret);
3709 rdev = ERR_PTR(ret);
3712 EXPORT_SYMBOL_GPL(regulator_register);
3715 * regulator_unregister - unregister regulator
3716 * @rdev: regulator to unregister
3718 * Called by regulator drivers to unregister a regulator.
3720 void regulator_unregister(struct regulator_dev *rdev)
3726 regulator_put(rdev->supply);
3727 mutex_lock(®ulator_list_mutex);
3728 debugfs_remove_recursive(rdev->debugfs);
3729 flush_work(&rdev->disable_work.work);
3730 WARN_ON(rdev->open_count);
3731 unset_regulator_supplies(rdev);
3732 list_del(&rdev->list);
3733 kfree(rdev->constraints);
3734 regulator_ena_gpio_free(rdev);
3735 device_unregister(&rdev->dev);
3736 mutex_unlock(®ulator_list_mutex);
3738 EXPORT_SYMBOL_GPL(regulator_unregister);
3741 * regulator_suspend_prepare - prepare regulators for system wide suspend
3742 * @state: system suspend state
3744 * Configure each regulator with it's suspend operating parameters for state.
3745 * This will usually be called by machine suspend code prior to supending.
3747 int regulator_suspend_prepare(suspend_state_t state)
3749 struct regulator_dev *rdev;
3752 /* ON is handled by regulator active state */
3753 if (state == PM_SUSPEND_ON)
3756 mutex_lock(®ulator_list_mutex);
3757 list_for_each_entry(rdev, ®ulator_list, list) {
3759 mutex_lock(&rdev->mutex);
3760 ret = suspend_prepare(rdev, state);
3761 mutex_unlock(&rdev->mutex);
3764 rdev_err(rdev, "failed to prepare\n");
3769 mutex_unlock(®ulator_list_mutex);
3772 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3775 * regulator_suspend_finish - resume regulators from system wide suspend
3777 * Turn on regulators that might be turned off by regulator_suspend_prepare
3778 * and that should be turned on according to the regulators properties.
3780 int regulator_suspend_finish(void)
3782 struct regulator_dev *rdev;
3785 mutex_lock(®ulator_list_mutex);
3786 list_for_each_entry(rdev, ®ulator_list, list) {
3787 struct regulator_ops *ops = rdev->desc->ops;
3789 mutex_lock(&rdev->mutex);
3790 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3792 error = ops->enable(rdev);
3796 if (!has_full_constraints)
3800 if (!_regulator_is_enabled(rdev))
3803 error = ops->disable(rdev);
3808 mutex_unlock(&rdev->mutex);
3810 mutex_unlock(®ulator_list_mutex);
3813 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3816 * regulator_has_full_constraints - the system has fully specified constraints
3818 * Calling this function will cause the regulator API to disable all
3819 * regulators which have a zero use count and don't have an always_on
3820 * constraint in a late_initcall.
3822 * The intention is that this will become the default behaviour in a
3823 * future kernel release so users are encouraged to use this facility
3826 void regulator_has_full_constraints(void)
3828 has_full_constraints = 1;
3830 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3833 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3835 * Calling this function will cause the regulator API to provide a
3836 * dummy regulator to consumers if no physical regulator is found,
3837 * allowing most consumers to proceed as though a regulator were
3838 * configured. This allows systems such as those with software
3839 * controllable regulators for the CPU core only to be brought up more
3842 void regulator_use_dummy_regulator(void)
3844 board_wants_dummy_regulator = true;
3846 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3849 * rdev_get_drvdata - get rdev regulator driver data
3852 * Get rdev regulator driver private data. This call can be used in the
3853 * regulator driver context.
3855 void *rdev_get_drvdata(struct regulator_dev *rdev)
3857 return rdev->reg_data;
3859 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3862 * regulator_get_drvdata - get regulator driver data
3863 * @regulator: regulator
3865 * Get regulator driver private data. This call can be used in the consumer
3866 * driver context when non API regulator specific functions need to be called.
3868 void *regulator_get_drvdata(struct regulator *regulator)
3870 return regulator->rdev->reg_data;
3872 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3875 * regulator_set_drvdata - set regulator driver data
3876 * @regulator: regulator
3879 void regulator_set_drvdata(struct regulator *regulator, void *data)
3881 regulator->rdev->reg_data = data;
3883 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3886 * regulator_get_id - get regulator ID
3889 int rdev_get_id(struct regulator_dev *rdev)
3891 return rdev->desc->id;
3893 EXPORT_SYMBOL_GPL(rdev_get_id);
3895 struct device *rdev_get_dev(struct regulator_dev *rdev)
3899 EXPORT_SYMBOL_GPL(rdev_get_dev);
3901 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3903 return reg_init_data->driver_data;
3905 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3907 #ifdef CONFIG_DEBUG_FS
3908 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3909 size_t count, loff_t *ppos)
3911 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3912 ssize_t len, ret = 0;
3913 struct regulator_map *map;
3918 list_for_each_entry(map, ®ulator_map_list, list) {
3919 len = snprintf(buf + ret, PAGE_SIZE - ret,
3921 rdev_get_name(map->regulator), map->dev_name,
3925 if (ret > PAGE_SIZE) {
3931 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3939 static const struct file_operations supply_map_fops = {
3940 #ifdef CONFIG_DEBUG_FS
3941 .read = supply_map_read_file,
3942 .llseek = default_llseek,
3946 static int __init regulator_init(void)
3950 ret = class_register(®ulator_class);
3952 debugfs_root = debugfs_create_dir("regulator", NULL);
3954 pr_warn("regulator: Failed to create debugfs directory\n");
3956 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3959 regulator_dummy_init();
3964 /* init early to allow our consumers to complete system booting */
3965 core_initcall(regulator_init);
3967 static int __init regulator_init_complete(void)
3969 struct regulator_dev *rdev;
3970 struct regulator_ops *ops;
3971 struct regulation_constraints *c;
3975 * Since DT doesn't provide an idiomatic mechanism for
3976 * enabling full constraints and since it's much more natural
3977 * with DT to provide them just assume that a DT enabled
3978 * system has full constraints.
3980 if (of_have_populated_dt())
3981 has_full_constraints = true;
3983 mutex_lock(®ulator_list_mutex);
3985 /* If we have a full configuration then disable any regulators
3986 * which are not in use or always_on. This will become the
3987 * default behaviour in the future.
3989 list_for_each_entry(rdev, ®ulator_list, list) {
3990 ops = rdev->desc->ops;
3991 c = rdev->constraints;
3993 if (!ops->disable || (c && c->always_on))
3996 mutex_lock(&rdev->mutex);
3998 if (rdev->use_count)
4001 /* If we can't read the status assume it's on. */
4002 if (ops->is_enabled)
4003 enabled = ops->is_enabled(rdev);
4010 if (has_full_constraints) {
4011 /* We log since this may kill the system if it
4013 rdev_info(rdev, "disabling\n");
4014 ret = ops->disable(rdev);
4016 rdev_err(rdev, "couldn't disable: %d\n", ret);
4019 /* The intention is that in future we will
4020 * assume that full constraints are provided
4021 * so warn even if we aren't going to do
4024 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4028 mutex_unlock(&rdev->mutex);
4031 mutex_unlock(®ulator_list_mutex);
4035 late_initcall(regulator_init_complete);