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>
34 #ifdef CONFIG_SLEEP_MONITOR
35 #include <linux/power/sleep_monitor.h>
38 #define CREATE_TRACE_POINTS
39 #include <trace/events/regulator.h>
43 #define rdev_crit(rdev, fmt, ...) \
44 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
45 #define rdev_err(rdev, fmt, ...) \
46 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
47 #define rdev_warn(rdev, fmt, ...) \
48 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
49 #define rdev_info(rdev, fmt, ...) \
50 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
51 #define rdev_dbg(rdev, fmt, ...) \
52 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
54 static DEFINE_MUTEX(regulator_list_mutex);
55 static LIST_HEAD(regulator_list);
56 static LIST_HEAD(regulator_map_list);
57 static LIST_HEAD(regulator_ena_gpio_list);
58 static bool has_full_constraints;
59 static bool board_wants_dummy_regulator;
61 static struct dentry *debugfs_root;
64 * struct regulator_map
66 * Used to provide symbolic supply names to devices.
68 struct regulator_map {
69 struct list_head list;
70 const char *dev_name; /* The dev_name() for the consumer */
72 struct regulator_dev *regulator;
76 * struct regulator_enable_gpio
78 * Management for shared enable GPIO pin
80 struct regulator_enable_gpio {
81 struct list_head list;
83 u32 enable_count; /* a number of enabled shared GPIO */
84 u32 request_count; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert:1;
91 * One for each consumer device.
95 struct list_head list;
96 unsigned int always_on:1;
97 unsigned int bypass:1;
102 struct device_attribute dev_attr;
103 struct regulator_dev *rdev;
104 struct dentry *debugfs;
107 static int _regulator_is_enabled(struct regulator_dev *rdev);
108 static int _regulator_disable(struct regulator_dev *rdev);
109 static int _regulator_get_voltage(struct regulator_dev *rdev);
110 static int _regulator_get_current_limit(struct regulator_dev *rdev);
111 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
112 static void _notifier_call_chain(struct regulator_dev *rdev,
113 unsigned long event, void *data);
114 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
115 int min_uV, int max_uV);
116 static struct regulator *create_regulator(struct regulator_dev *rdev,
118 const char *supply_name);
120 static const char *rdev_get_name(struct regulator_dev *rdev)
122 if (rdev->constraints && rdev->constraints->name)
123 return rdev->constraints->name;
124 else if (rdev->desc->name)
125 return rdev->desc->name;
131 * of_get_regulator - get a regulator device node based on supply name
132 * @dev: Device pointer for the consumer (of regulator) device
133 * @supply: regulator supply name
135 * Extract the regulator device node corresponding to the supply name.
136 * returns the device node corresponding to the regulator if found, else
139 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
141 struct device_node *regnode = NULL;
142 char prop_name[32]; /* 32 is max size of property name */
144 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
146 snprintf(prop_name, 32, "%s-supply", supply);
147 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
150 dev_dbg(dev, "Looking up %s property in node %s failed",
151 prop_name, dev->of_node->full_name);
157 static int _regulator_can_change_status(struct regulator_dev *rdev)
159 if (!rdev->constraints)
162 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
168 /* Platform voltage constraint check */
169 static int regulator_check_voltage(struct regulator_dev *rdev,
170 int *min_uV, int *max_uV)
172 BUG_ON(*min_uV > *max_uV);
174 if (!rdev->constraints) {
175 rdev_err(rdev, "no constraints\n");
178 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
179 rdev_err(rdev, "operation not allowed\n");
183 if (*max_uV > rdev->constraints->max_uV)
184 *max_uV = rdev->constraints->max_uV;
185 if (*min_uV < rdev->constraints->min_uV)
186 *min_uV = rdev->constraints->min_uV;
188 if (*min_uV > *max_uV) {
189 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
197 /* Make sure we select a voltage that suits the needs of all
198 * regulator consumers
200 static int regulator_check_consumers(struct regulator_dev *rdev,
201 int *min_uV, int *max_uV)
203 struct regulator *regulator;
205 list_for_each_entry(regulator, &rdev->consumer_list, list) {
207 * Assume consumers that didn't say anything are OK
208 * with anything in the constraint range.
210 if (!regulator->min_uV && !regulator->max_uV)
213 if (*max_uV > regulator->max_uV)
214 *max_uV = regulator->max_uV;
215 if (*min_uV < regulator->min_uV)
216 *min_uV = regulator->min_uV;
219 if (*min_uV > *max_uV) {
220 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
228 /* current constraint check */
229 static int regulator_check_current_limit(struct regulator_dev *rdev,
230 int *min_uA, int *max_uA)
232 BUG_ON(*min_uA > *max_uA);
234 if (!rdev->constraints) {
235 rdev_err(rdev, "no constraints\n");
238 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
239 rdev_err(rdev, "operation not allowed\n");
243 if (*max_uA > rdev->constraints->max_uA)
244 *max_uA = rdev->constraints->max_uA;
245 if (*min_uA < rdev->constraints->min_uA)
246 *min_uA = rdev->constraints->min_uA;
248 if (*min_uA > *max_uA) {
249 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
257 /* operating mode constraint check */
258 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
261 case REGULATOR_MODE_FAST:
262 case REGULATOR_MODE_NORMAL:
263 case REGULATOR_MODE_IDLE:
264 case REGULATOR_MODE_STANDBY:
267 rdev_err(rdev, "invalid mode %x specified\n", *mode);
271 if (!rdev->constraints) {
272 rdev_err(rdev, "no constraints\n");
275 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
276 rdev_err(rdev, "operation not allowed\n");
280 /* The modes are bitmasks, the most power hungry modes having
281 * the lowest values. If the requested mode isn't supported
282 * try higher modes. */
284 if (rdev->constraints->valid_modes_mask & *mode)
292 /* dynamic regulator mode switching constraint check */
293 static int regulator_check_drms(struct regulator_dev *rdev)
295 if (!rdev->constraints) {
296 rdev_err(rdev, "no constraints\n");
299 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
300 rdev_err(rdev, "operation not allowed\n");
306 static ssize_t regulator_uV_show(struct device *dev,
307 struct device_attribute *attr, char *buf)
309 struct regulator_dev *rdev = dev_get_drvdata(dev);
312 mutex_lock(&rdev->mutex);
313 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
314 mutex_unlock(&rdev->mutex);
318 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
320 static ssize_t regulator_uA_show(struct device *dev,
321 struct device_attribute *attr, char *buf)
323 struct regulator_dev *rdev = dev_get_drvdata(dev);
325 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
327 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
329 static ssize_t regulator_name_show(struct device *dev,
330 struct device_attribute *attr, char *buf)
332 struct regulator_dev *rdev = dev_get_drvdata(dev);
334 return sprintf(buf, "%s\n", rdev_get_name(rdev));
337 static ssize_t regulator_print_opmode(char *buf, int mode)
340 case REGULATOR_MODE_FAST:
341 return sprintf(buf, "fast\n");
342 case REGULATOR_MODE_NORMAL:
343 return sprintf(buf, "normal\n");
344 case REGULATOR_MODE_IDLE:
345 return sprintf(buf, "idle\n");
346 case REGULATOR_MODE_STANDBY:
347 return sprintf(buf, "standby\n");
349 return sprintf(buf, "unknown\n");
352 static ssize_t regulator_opmode_show(struct device *dev,
353 struct device_attribute *attr, char *buf)
355 struct regulator_dev *rdev = dev_get_drvdata(dev);
357 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
359 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
361 static ssize_t regulator_print_state(char *buf, int state)
364 return sprintf(buf, "enabled\n");
366 return sprintf(buf, "disabled\n");
368 return sprintf(buf, "unknown\n");
371 static ssize_t regulator_state_show(struct device *dev,
372 struct device_attribute *attr, char *buf)
374 struct regulator_dev *rdev = dev_get_drvdata(dev);
377 mutex_lock(&rdev->mutex);
378 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
379 mutex_unlock(&rdev->mutex);
383 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
385 static ssize_t regulator_status_show(struct device *dev,
386 struct device_attribute *attr, char *buf)
388 struct regulator_dev *rdev = dev_get_drvdata(dev);
392 status = rdev->desc->ops->get_status(rdev);
397 case REGULATOR_STATUS_OFF:
400 case REGULATOR_STATUS_ON:
403 case REGULATOR_STATUS_ERROR:
406 case REGULATOR_STATUS_FAST:
409 case REGULATOR_STATUS_NORMAL:
412 case REGULATOR_STATUS_IDLE:
415 case REGULATOR_STATUS_STANDBY:
418 case REGULATOR_STATUS_BYPASS:
421 case REGULATOR_STATUS_UNDEFINED:
428 return sprintf(buf, "%s\n", label);
430 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
432 static ssize_t regulator_min_uA_show(struct device *dev,
433 struct device_attribute *attr, char *buf)
435 struct regulator_dev *rdev = dev_get_drvdata(dev);
437 if (!rdev->constraints)
438 return sprintf(buf, "constraint not defined\n");
440 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
442 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
444 static ssize_t regulator_max_uA_show(struct device *dev,
445 struct device_attribute *attr, char *buf)
447 struct regulator_dev *rdev = dev_get_drvdata(dev);
449 if (!rdev->constraints)
450 return sprintf(buf, "constraint not defined\n");
452 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
454 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
456 static ssize_t regulator_min_uV_show(struct device *dev,
457 struct device_attribute *attr, char *buf)
459 struct regulator_dev *rdev = dev_get_drvdata(dev);
461 if (!rdev->constraints)
462 return sprintf(buf, "constraint not defined\n");
464 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
466 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
468 static ssize_t regulator_max_uV_show(struct device *dev,
469 struct device_attribute *attr, char *buf)
471 struct regulator_dev *rdev = dev_get_drvdata(dev);
473 if (!rdev->constraints)
474 return sprintf(buf, "constraint not defined\n");
476 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
478 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
480 static ssize_t regulator_total_uA_show(struct device *dev,
481 struct device_attribute *attr, char *buf)
483 struct regulator_dev *rdev = dev_get_drvdata(dev);
484 struct regulator *regulator;
487 mutex_lock(&rdev->mutex);
488 list_for_each_entry(regulator, &rdev->consumer_list, list)
489 uA += regulator->uA_load;
490 mutex_unlock(&rdev->mutex);
491 return sprintf(buf, "%d\n", uA);
493 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
495 static ssize_t regulator_num_users_show(struct device *dev,
496 struct device_attribute *attr, char *buf)
498 struct regulator_dev *rdev = dev_get_drvdata(dev);
499 return sprintf(buf, "%d\n", rdev->use_count);
502 static ssize_t regulator_type_show(struct device *dev,
503 struct device_attribute *attr, char *buf)
505 struct regulator_dev *rdev = dev_get_drvdata(dev);
507 switch (rdev->desc->type) {
508 case REGULATOR_VOLTAGE:
509 return sprintf(buf, "voltage\n");
510 case REGULATOR_CURRENT:
511 return sprintf(buf, "current\n");
513 return sprintf(buf, "unknown\n");
516 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
517 struct device_attribute *attr, char *buf)
519 struct regulator_dev *rdev = dev_get_drvdata(dev);
521 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
523 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
524 regulator_suspend_mem_uV_show, NULL);
526 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
527 struct device_attribute *attr, char *buf)
529 struct regulator_dev *rdev = dev_get_drvdata(dev);
531 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
533 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
534 regulator_suspend_disk_uV_show, NULL);
536 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
537 struct device_attribute *attr, char *buf)
539 struct regulator_dev *rdev = dev_get_drvdata(dev);
541 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
543 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
544 regulator_suspend_standby_uV_show, NULL);
546 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
547 struct device_attribute *attr, char *buf)
549 struct regulator_dev *rdev = dev_get_drvdata(dev);
551 return regulator_print_opmode(buf,
552 rdev->constraints->state_mem.mode);
554 static DEVICE_ATTR(suspend_mem_mode, 0444,
555 regulator_suspend_mem_mode_show, NULL);
557 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
558 struct device_attribute *attr, char *buf)
560 struct regulator_dev *rdev = dev_get_drvdata(dev);
562 return regulator_print_opmode(buf,
563 rdev->constraints->state_disk.mode);
565 static DEVICE_ATTR(suspend_disk_mode, 0444,
566 regulator_suspend_disk_mode_show, NULL);
568 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
569 struct device_attribute *attr, char *buf)
571 struct regulator_dev *rdev = dev_get_drvdata(dev);
573 return regulator_print_opmode(buf,
574 rdev->constraints->state_standby.mode);
576 static DEVICE_ATTR(suspend_standby_mode, 0444,
577 regulator_suspend_standby_mode_show, NULL);
579 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
580 struct device_attribute *attr, char *buf)
582 struct regulator_dev *rdev = dev_get_drvdata(dev);
584 return regulator_print_state(buf,
585 rdev->constraints->state_mem.enabled);
587 static DEVICE_ATTR(suspend_mem_state, 0444,
588 regulator_suspend_mem_state_show, NULL);
590 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
591 struct device_attribute *attr, char *buf)
593 struct regulator_dev *rdev = dev_get_drvdata(dev);
595 return regulator_print_state(buf,
596 rdev->constraints->state_disk.enabled);
598 static DEVICE_ATTR(suspend_disk_state, 0444,
599 regulator_suspend_disk_state_show, NULL);
601 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
602 struct device_attribute *attr, char *buf)
604 struct regulator_dev *rdev = dev_get_drvdata(dev);
606 return regulator_print_state(buf,
607 rdev->constraints->state_standby.enabled);
609 static DEVICE_ATTR(suspend_standby_state, 0444,
610 regulator_suspend_standby_state_show, NULL);
612 static ssize_t regulator_bypass_show(struct device *dev,
613 struct device_attribute *attr, char *buf)
615 struct regulator_dev *rdev = dev_get_drvdata(dev);
620 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
629 return sprintf(buf, "%s\n", report);
631 static DEVICE_ATTR(bypass, 0444,
632 regulator_bypass_show, NULL);
635 * These are the only attributes are present for all regulators.
636 * Other attributes are a function of regulator functionality.
638 static struct device_attribute regulator_dev_attrs[] = {
639 __ATTR(name, 0444, regulator_name_show, NULL),
640 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
641 __ATTR(type, 0444, regulator_type_show, NULL),
645 static void regulator_dev_release(struct device *dev)
647 struct regulator_dev *rdev = dev_get_drvdata(dev);
651 static struct class regulator_class = {
653 .dev_release = regulator_dev_release,
654 .dev_attrs = regulator_dev_attrs,
657 /* Calculate the new optimum regulator operating mode based on the new total
658 * consumer load. All locks held by caller */
659 static void drms_uA_update(struct regulator_dev *rdev)
661 struct regulator *sibling;
662 int current_uA = 0, output_uV, input_uV, err;
665 err = regulator_check_drms(rdev);
666 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
667 (!rdev->desc->ops->get_voltage &&
668 !rdev->desc->ops->get_voltage_sel) ||
669 !rdev->desc->ops->set_mode)
672 /* get output voltage */
673 output_uV = _regulator_get_voltage(rdev);
677 /* get input voltage */
680 input_uV = regulator_get_voltage(rdev->supply);
682 input_uV = rdev->constraints->input_uV;
686 /* calc total requested load */
687 list_for_each_entry(sibling, &rdev->consumer_list, list)
688 current_uA += sibling->uA_load;
690 /* now get the optimum mode for our new total regulator load */
691 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
692 output_uV, current_uA);
694 /* check the new mode is allowed */
695 err = regulator_mode_constrain(rdev, &mode);
697 rdev->desc->ops->set_mode(rdev, mode);
700 static int suspend_set_state(struct regulator_dev *rdev,
701 struct regulator_state *rstate)
705 /* If we have no suspend mode configration don't set anything;
706 * only warn if the driver implements set_suspend_voltage or
707 * set_suspend_mode callback.
709 if (!rstate->enabled && !rstate->disabled) {
710 if (rdev->desc->ops->set_suspend_voltage ||
711 rdev->desc->ops->set_suspend_mode)
712 rdev_warn(rdev, "No configuration\n");
716 if (rstate->enabled && rstate->disabled) {
717 rdev_err(rdev, "invalid configuration\n");
721 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
722 ret = rdev->desc->ops->set_suspend_enable(rdev);
723 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
724 ret = rdev->desc->ops->set_suspend_disable(rdev);
725 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
729 rdev_err(rdev, "failed to enabled/disable\n");
733 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
734 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
736 rdev_err(rdev, "failed to set voltage\n");
741 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
742 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
744 rdev_err(rdev, "failed to set mode\n");
751 /* locks held by caller */
752 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
754 if (!rdev->constraints)
758 case PM_SUSPEND_STANDBY:
759 return suspend_set_state(rdev,
760 &rdev->constraints->state_standby);
762 return suspend_set_state(rdev,
763 &rdev->constraints->state_mem);
765 return suspend_set_state(rdev,
766 &rdev->constraints->state_disk);
772 static void print_constraints(struct regulator_dev *rdev)
774 struct regulation_constraints *constraints = rdev->constraints;
779 if (constraints->min_uV && constraints->max_uV) {
780 if (constraints->min_uV == constraints->max_uV)
781 count += sprintf(buf + count, "%d mV ",
782 constraints->min_uV / 1000);
784 count += sprintf(buf + count, "%d <--> %d mV ",
785 constraints->min_uV / 1000,
786 constraints->max_uV / 1000);
789 if (!constraints->min_uV ||
790 constraints->min_uV != constraints->max_uV) {
791 ret = _regulator_get_voltage(rdev);
793 count += sprintf(buf + count, "at %d mV ", ret / 1000);
796 if (constraints->uV_offset)
797 count += sprintf(buf, "%dmV offset ",
798 constraints->uV_offset / 1000);
800 if (constraints->min_uA && constraints->max_uA) {
801 if (constraints->min_uA == constraints->max_uA)
802 count += sprintf(buf + count, "%d mA ",
803 constraints->min_uA / 1000);
805 count += sprintf(buf + count, "%d <--> %d mA ",
806 constraints->min_uA / 1000,
807 constraints->max_uA / 1000);
810 if (!constraints->min_uA ||
811 constraints->min_uA != constraints->max_uA) {
812 ret = _regulator_get_current_limit(rdev);
814 count += sprintf(buf + count, "at %d mA ", ret / 1000);
817 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
818 count += sprintf(buf + count, "fast ");
819 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
820 count += sprintf(buf + count, "normal ");
821 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
822 count += sprintf(buf + count, "idle ");
823 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
824 count += sprintf(buf + count, "standby");
827 sprintf(buf, "no parameters");
829 rdev_info(rdev, "%s\n", buf);
831 if ((constraints->min_uV != constraints->max_uV) &&
832 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
834 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
837 static int machine_constraints_voltage(struct regulator_dev *rdev,
838 struct regulation_constraints *constraints)
840 struct regulator_ops *ops = rdev->desc->ops;
843 /* do we need to apply the constraint voltage */
844 if (rdev->constraints->apply_uV &&
845 rdev->constraints->min_uV == rdev->constraints->max_uV) {
846 ret = _regulator_do_set_voltage(rdev,
847 rdev->constraints->min_uV,
848 rdev->constraints->max_uV);
850 rdev_err(rdev, "failed to apply %duV constraint\n",
851 rdev->constraints->min_uV);
856 /* constrain machine-level voltage specs to fit
857 * the actual range supported by this regulator.
859 if (ops->list_voltage && rdev->desc->n_voltages) {
860 int count = rdev->desc->n_voltages;
862 int min_uV = INT_MAX;
863 int max_uV = INT_MIN;
864 int cmin = constraints->min_uV;
865 int cmax = constraints->max_uV;
867 /* it's safe to autoconfigure fixed-voltage supplies
868 and the constraints are used by list_voltage. */
869 if (count == 1 && !cmin) {
872 constraints->min_uV = cmin;
873 constraints->max_uV = cmax;
876 /* voltage constraints are optional */
877 if ((cmin == 0) && (cmax == 0))
880 /* else require explicit machine-level constraints */
881 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
882 rdev_err(rdev, "invalid voltage constraints\n");
886 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
887 for (i = 0; i < count; i++) {
890 value = ops->list_voltage(rdev, i);
894 /* maybe adjust [min_uV..max_uV] */
895 if (value >= cmin && value < min_uV)
897 if (value <= cmax && value > max_uV)
901 /* final: [min_uV..max_uV] valid iff constraints valid */
902 if (max_uV < min_uV) {
904 "unsupportable voltage constraints %u-%uuV\n",
909 /* use regulator's subset of machine constraints */
910 if (constraints->min_uV < min_uV) {
911 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
912 constraints->min_uV, min_uV);
913 constraints->min_uV = min_uV;
915 if (constraints->max_uV > max_uV) {
916 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
917 constraints->max_uV, max_uV);
918 constraints->max_uV = max_uV;
925 static int _regulator_do_enable(struct regulator_dev *rdev);
928 * set_machine_constraints - sets regulator constraints
929 * @rdev: regulator source
930 * @constraints: constraints to apply
932 * Allows platform initialisation code to define and constrain
933 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
934 * Constraints *must* be set by platform code in order for some
935 * regulator operations to proceed i.e. set_voltage, set_current_limit,
938 static int set_machine_constraints(struct regulator_dev *rdev,
939 const struct regulation_constraints *constraints)
942 struct regulator_ops *ops = rdev->desc->ops;
945 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
948 rdev->constraints = kzalloc(sizeof(*constraints),
950 if (!rdev->constraints)
953 ret = machine_constraints_voltage(rdev, rdev->constraints);
957 /* do we need to setup our suspend state */
958 if (rdev->constraints->initial_state) {
959 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
961 rdev_err(rdev, "failed to set suspend state\n");
966 if (rdev->constraints->initial_mode) {
967 if (!ops->set_mode) {
968 rdev_err(rdev, "no set_mode operation\n");
973 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
975 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
980 /* If the constraints say the regulator should be on at this point
981 * and we have control then make sure it is enabled.
983 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
984 ret = _regulator_do_enable(rdev);
985 if (ret < 0 && ret != -EINVAL) {
986 rdev_err(rdev, "failed to enable\n");
991 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) {
992 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
994 rdev_err(rdev, "failed to set ramp_delay\n");
999 print_constraints(rdev);
1002 kfree(rdev->constraints);
1003 rdev->constraints = NULL;
1008 * set_supply - set regulator supply regulator
1009 * @rdev: regulator name
1010 * @supply_rdev: supply regulator name
1012 * Called by platform initialisation code to set the supply regulator for this
1013 * regulator. This ensures that a regulators supply will also be enabled by the
1014 * core if it's child is enabled.
1016 static int set_supply(struct regulator_dev *rdev,
1017 struct regulator_dev *supply_rdev)
1021 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1023 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1024 if (rdev->supply == NULL) {
1028 supply_rdev->open_count++;
1034 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1035 * @rdev: regulator source
1036 * @consumer_dev_name: dev_name() string for device supply applies to
1037 * @supply: symbolic name for supply
1039 * Allows platform initialisation code to map physical regulator
1040 * sources to symbolic names for supplies for use by devices. Devices
1041 * should use these symbolic names to request regulators, avoiding the
1042 * need to provide board-specific regulator names as platform data.
1044 static int set_consumer_device_supply(struct regulator_dev *rdev,
1045 const char *consumer_dev_name,
1048 struct regulator_map *node;
1054 if (consumer_dev_name != NULL)
1059 list_for_each_entry(node, ®ulator_map_list, list) {
1060 if (node->dev_name && consumer_dev_name) {
1061 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1063 } else if (node->dev_name || consumer_dev_name) {
1067 if (strcmp(node->supply, supply) != 0)
1070 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1072 dev_name(&node->regulator->dev),
1073 node->regulator->desc->name,
1075 dev_name(&rdev->dev), rdev_get_name(rdev));
1079 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1083 node->regulator = rdev;
1084 node->supply = supply;
1087 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1088 if (node->dev_name == NULL) {
1094 list_add(&node->list, ®ulator_map_list);
1098 static void unset_regulator_supplies(struct regulator_dev *rdev)
1100 struct regulator_map *node, *n;
1102 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1103 if (rdev == node->regulator) {
1104 list_del(&node->list);
1105 kfree(node->dev_name);
1111 #define REG_STR_SIZE 64
1113 static struct regulator *create_regulator(struct regulator_dev *rdev,
1115 const char *supply_name)
1117 struct regulator *regulator;
1118 char buf[REG_STR_SIZE];
1121 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1122 if (regulator == NULL)
1125 mutex_lock(&rdev->mutex);
1126 regulator->rdev = rdev;
1127 list_add(®ulator->list, &rdev->consumer_list);
1130 regulator->dev = dev;
1132 /* Add a link to the device sysfs entry */
1133 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1134 dev->kobj.name, supply_name);
1135 if (size >= REG_STR_SIZE)
1138 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1139 if (regulator->supply_name == NULL)
1142 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1145 rdev_warn(rdev, "could not add device link %s err %d\n",
1146 dev->kobj.name, err);
1150 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1151 if (regulator->supply_name == NULL)
1155 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1157 if (!regulator->debugfs) {
1158 rdev_warn(rdev, "Failed to create debugfs directory\n");
1160 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1161 ®ulator->uA_load);
1162 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1163 ®ulator->min_uV);
1164 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1165 ®ulator->max_uV);
1169 * Check now if the regulator is an always on regulator - if
1170 * it is then we don't need to do nearly so much work for
1171 * enable/disable calls.
1173 if (!_regulator_can_change_status(rdev) &&
1174 _regulator_is_enabled(rdev))
1175 regulator->always_on = true;
1177 mutex_unlock(&rdev->mutex);
1180 list_del(®ulator->list);
1182 mutex_unlock(&rdev->mutex);
1186 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1188 if (!rdev->desc->ops->enable_time)
1189 return rdev->desc->enable_time;
1190 return rdev->desc->ops->enable_time(rdev);
1193 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1197 struct regulator_dev *r;
1198 struct device_node *node;
1199 struct regulator_map *map;
1200 const char *devname = NULL;
1202 /* first do a dt based lookup */
1203 if (dev && dev->of_node) {
1204 node = of_get_regulator(dev, supply);
1206 list_for_each_entry(r, ®ulator_list, list)
1207 if (r->dev.parent &&
1208 node == r->dev.of_node)
1212 * If we couldn't even get the node then it's
1213 * not just that the device didn't register
1214 * yet, there's no node and we'll never
1221 /* if not found, try doing it non-dt way */
1223 devname = dev_name(dev);
1225 list_for_each_entry(r, ®ulator_list, list)
1226 if (strcmp(rdev_get_name(r), supply) == 0)
1229 list_for_each_entry(map, ®ulator_map_list, list) {
1230 /* If the mapping has a device set up it must match */
1231 if (map->dev_name &&
1232 (!devname || strcmp(map->dev_name, devname)))
1235 if (strcmp(map->supply, supply) == 0)
1236 return map->regulator;
1243 /* Internal regulator request function */
1244 static struct regulator *_regulator_get(struct device *dev, const char *id,
1247 struct regulator_dev *rdev;
1248 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1249 const char *devname = NULL;
1253 pr_err("get() with no identifier\n");
1258 devname = dev_name(dev);
1260 mutex_lock(®ulator_list_mutex);
1262 rdev = regulator_dev_lookup(dev, id, &ret);
1267 * If we have return value from dev_lookup fail, we do not expect to
1268 * succeed, so, quit with appropriate error value
1271 regulator = ERR_PTR(ret);
1275 if (board_wants_dummy_regulator) {
1276 rdev = dummy_regulator_rdev;
1280 #ifdef CONFIG_REGULATOR_DUMMY
1282 devname = "deviceless";
1284 /* If the board didn't flag that it was fully constrained then
1285 * substitute in a dummy regulator so consumers can continue.
1287 if (!has_full_constraints) {
1288 pr_warn("%s supply %s not found, using dummy regulator\n",
1290 rdev = dummy_regulator_rdev;
1295 mutex_unlock(®ulator_list_mutex);
1299 if (rdev->exclusive) {
1300 regulator = ERR_PTR(-EPERM);
1304 if (exclusive && rdev->open_count) {
1305 regulator = ERR_PTR(-EBUSY);
1309 if (!try_module_get(rdev->owner))
1312 regulator = create_regulator(rdev, dev, id);
1313 if (regulator == NULL) {
1314 regulator = ERR_PTR(-ENOMEM);
1315 module_put(rdev->owner);
1321 rdev->exclusive = 1;
1323 ret = _regulator_is_enabled(rdev);
1325 rdev->use_count = 1;
1327 rdev->use_count = 0;
1331 mutex_unlock(®ulator_list_mutex);
1337 * regulator_get - lookup and obtain a reference to a regulator.
1338 * @dev: device for regulator "consumer"
1339 * @id: Supply name or regulator ID.
1341 * Returns a struct regulator corresponding to the regulator producer,
1342 * or IS_ERR() condition containing errno.
1344 * Use of supply names configured via regulator_set_device_supply() is
1345 * strongly encouraged. It is recommended that the supply name used
1346 * should match the name used for the supply and/or the relevant
1347 * device pins in the datasheet.
1349 struct regulator *regulator_get(struct device *dev, const char *id)
1351 return _regulator_get(dev, id, 0);
1353 EXPORT_SYMBOL_GPL(regulator_get);
1355 static void devm_regulator_release(struct device *dev, void *res)
1357 regulator_put(*(struct regulator **)res);
1361 * devm_regulator_get - Resource managed regulator_get()
1362 * @dev: device for regulator "consumer"
1363 * @id: Supply name or regulator ID.
1365 * Managed regulator_get(). Regulators returned from this function are
1366 * automatically regulator_put() on driver detach. See regulator_get() for more
1369 struct regulator *devm_regulator_get(struct device *dev, const char *id)
1371 struct regulator **ptr, *regulator;
1373 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1375 return ERR_PTR(-ENOMEM);
1377 regulator = regulator_get(dev, id);
1378 if (!IS_ERR(regulator)) {
1380 devres_add(dev, ptr);
1387 EXPORT_SYMBOL_GPL(devm_regulator_get);
1390 * regulator_get_exclusive - obtain exclusive access to a regulator.
1391 * @dev: device for regulator "consumer"
1392 * @id: Supply name or regulator ID.
1394 * Returns a struct regulator corresponding to the regulator producer,
1395 * or IS_ERR() condition containing errno. Other consumers will be
1396 * unable to obtain this reference is held and the use count for the
1397 * regulator will be initialised to reflect the current state of the
1400 * This is intended for use by consumers which cannot tolerate shared
1401 * use of the regulator such as those which need to force the
1402 * regulator off for correct operation of the hardware they are
1405 * Use of supply names configured via regulator_set_device_supply() is
1406 * strongly encouraged. It is recommended that the supply name used
1407 * should match the name used for the supply and/or the relevant
1408 * device pins in the datasheet.
1410 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1412 return _regulator_get(dev, id, 1);
1414 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1416 /* Locks held by regulator_put() */
1417 static void _regulator_put(struct regulator *regulator)
1419 struct regulator_dev *rdev;
1421 if (regulator == NULL || IS_ERR(regulator))
1424 rdev = regulator->rdev;
1426 debugfs_remove_recursive(regulator->debugfs);
1428 /* remove any sysfs entries */
1430 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1431 kfree(regulator->supply_name);
1432 list_del(®ulator->list);
1436 rdev->exclusive = 0;
1438 module_put(rdev->owner);
1442 * regulator_put - "free" the regulator source
1443 * @regulator: regulator source
1445 * Note: drivers must ensure that all regulator_enable calls made on this
1446 * regulator source are balanced by regulator_disable calls prior to calling
1449 void regulator_put(struct regulator *regulator)
1451 mutex_lock(®ulator_list_mutex);
1452 _regulator_put(regulator);
1453 mutex_unlock(®ulator_list_mutex);
1455 EXPORT_SYMBOL_GPL(regulator_put);
1457 static int devm_regulator_match(struct device *dev, void *res, void *data)
1459 struct regulator **r = res;
1468 * devm_regulator_put - Resource managed regulator_put()
1469 * @regulator: regulator to free
1471 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1472 * this function will not need to be called and the resource management
1473 * code will ensure that the resource is freed.
1475 void devm_regulator_put(struct regulator *regulator)
1479 rc = devres_release(regulator->dev, devm_regulator_release,
1480 devm_regulator_match, regulator);
1484 EXPORT_SYMBOL_GPL(devm_regulator_put);
1486 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1487 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1488 const struct regulator_config *config)
1490 struct regulator_enable_gpio *pin;
1493 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1494 if (pin->gpio == config->ena_gpio) {
1495 rdev_dbg(rdev, "GPIO %d is already used\n",
1497 goto update_ena_gpio_to_rdev;
1501 ret = gpio_request_one(config->ena_gpio,
1502 GPIOF_DIR_OUT | config->ena_gpio_flags,
1503 rdev_get_name(rdev));
1507 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1509 gpio_free(config->ena_gpio);
1513 pin->gpio = config->ena_gpio;
1514 pin->ena_gpio_invert = config->ena_gpio_invert;
1515 list_add(&pin->list, ®ulator_ena_gpio_list);
1517 update_ena_gpio_to_rdev:
1518 pin->request_count++;
1519 rdev->ena_pin = pin;
1523 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1525 struct regulator_enable_gpio *pin, *n;
1530 /* Free the GPIO only in case of no use */
1531 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
1532 if (pin->gpio == rdev->ena_pin->gpio) {
1533 if (pin->request_count <= 1) {
1534 pin->request_count = 0;
1535 gpio_free(pin->gpio);
1536 list_del(&pin->list);
1539 pin->request_count--;
1546 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1547 * @rdev: regulator_dev structure
1548 * @enable: enable GPIO at initial use?
1550 * GPIO is enabled in case of initial use. (enable_count is 0)
1551 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1553 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1555 struct regulator_enable_gpio *pin = rdev->ena_pin;
1561 /* Enable GPIO at initial use */
1562 if (pin->enable_count == 0)
1563 gpio_set_value_cansleep(pin->gpio,
1564 !pin->ena_gpio_invert);
1566 pin->enable_count++;
1568 if (pin->enable_count > 1) {
1569 pin->enable_count--;
1573 /* Disable GPIO if not used */
1574 if (pin->enable_count <= 1) {
1575 gpio_set_value_cansleep(pin->gpio,
1576 pin->ena_gpio_invert);
1577 pin->enable_count = 0;
1584 static int _regulator_do_enable(struct regulator_dev *rdev)
1588 /* Query before enabling in case configuration dependent. */
1589 ret = _regulator_get_enable_time(rdev);
1593 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1597 trace_regulator_enable(rdev_get_name(rdev));
1599 if (rdev->ena_pin) {
1600 ret = regulator_ena_gpio_ctrl(rdev, true);
1603 rdev->ena_gpio_state = 1;
1604 } else if (rdev->desc->ops->enable) {
1605 ret = rdev->desc->ops->enable(rdev);
1612 /* Allow the regulator to ramp; it would be useful to extend
1613 * this for bulk operations so that the regulators can ramp
1615 trace_regulator_enable_delay(rdev_get_name(rdev));
1617 if (delay >= 1000) {
1618 mdelay(delay / 1000);
1619 udelay(delay % 1000);
1624 trace_regulator_enable_complete(rdev_get_name(rdev));
1629 /* locks held by regulator_enable() */
1630 static int _regulator_enable(struct regulator_dev *rdev)
1634 /* check voltage and requested load before enabling */
1635 if (rdev->constraints &&
1636 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1637 drms_uA_update(rdev);
1639 if (rdev->use_count == 0) {
1640 /* The regulator may on if it's not switchable or left on */
1641 ret = _regulator_is_enabled(rdev);
1642 if (ret == -EINVAL || ret == 0) {
1643 if (!_regulator_can_change_status(rdev))
1646 ret = _regulator_do_enable(rdev);
1650 } else if (ret < 0) {
1651 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1654 /* Fallthrough on positive return values - already enabled */
1663 * regulator_enable - enable regulator output
1664 * @regulator: regulator source
1666 * Request that the regulator be enabled with the regulator output at
1667 * the predefined voltage or current value. Calls to regulator_enable()
1668 * must be balanced with calls to regulator_disable().
1670 * NOTE: the output value can be set by other drivers, boot loader or may be
1671 * hardwired in the regulator.
1673 int regulator_enable(struct regulator *regulator)
1675 struct regulator_dev *rdev = regulator->rdev;
1678 if (regulator->always_on)
1682 ret = regulator_enable(rdev->supply);
1687 mutex_lock(&rdev->mutex);
1688 ret = _regulator_enable(rdev);
1689 mutex_unlock(&rdev->mutex);
1691 if (ret != 0 && rdev->supply)
1692 regulator_disable(rdev->supply);
1696 EXPORT_SYMBOL_GPL(regulator_enable);
1698 static int _regulator_do_disable(struct regulator_dev *rdev)
1702 trace_regulator_disable(rdev_get_name(rdev));
1704 if (rdev->ena_pin) {
1705 ret = regulator_ena_gpio_ctrl(rdev, false);
1708 rdev->ena_gpio_state = 0;
1710 } else if (rdev->desc->ops->disable) {
1711 ret = rdev->desc->ops->disable(rdev);
1716 trace_regulator_disable_complete(rdev_get_name(rdev));
1721 /* locks held by regulator_disable() */
1722 static int _regulator_disable(struct regulator_dev *rdev)
1726 if (WARN(rdev->use_count <= 0,
1727 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1730 /* are we the last user and permitted to disable ? */
1731 if (rdev->use_count == 1 &&
1732 (rdev->constraints && !rdev->constraints->always_on)) {
1734 /* we are last user */
1735 if (_regulator_can_change_status(rdev)) {
1736 ret = _regulator_do_disable(rdev);
1738 rdev_err(rdev, "failed to disable\n");
1741 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1745 rdev->use_count = 0;
1746 } else if (rdev->use_count > 1) {
1748 if (rdev->constraints &&
1749 (rdev->constraints->valid_ops_mask &
1750 REGULATOR_CHANGE_DRMS))
1751 drms_uA_update(rdev);
1760 * regulator_disable - disable regulator output
1761 * @regulator: regulator source
1763 * Disable the regulator output voltage or current. Calls to
1764 * regulator_enable() must be balanced with calls to
1765 * regulator_disable().
1767 * NOTE: this will only disable the regulator output if no other consumer
1768 * devices have it enabled, the regulator device supports disabling and
1769 * machine constraints permit this operation.
1771 int regulator_disable(struct regulator *regulator)
1773 struct regulator_dev *rdev = regulator->rdev;
1776 if (regulator->always_on)
1779 mutex_lock(&rdev->mutex);
1780 ret = _regulator_disable(rdev);
1781 mutex_unlock(&rdev->mutex);
1783 if (ret == 0 && rdev->supply)
1784 regulator_disable(rdev->supply);
1788 EXPORT_SYMBOL_GPL(regulator_disable);
1790 /* locks held by regulator_force_disable() */
1791 static int _regulator_force_disable(struct regulator_dev *rdev)
1795 ret = _regulator_do_disable(rdev);
1797 rdev_err(rdev, "failed to force disable\n");
1801 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1802 REGULATOR_EVENT_DISABLE, NULL);
1808 * regulator_force_disable - force disable regulator output
1809 * @regulator: regulator source
1811 * Forcibly disable the regulator output voltage or current.
1812 * NOTE: this *will* disable the regulator output even if other consumer
1813 * devices have it enabled. This should be used for situations when device
1814 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1816 int regulator_force_disable(struct regulator *regulator)
1818 struct regulator_dev *rdev = regulator->rdev;
1821 mutex_lock(&rdev->mutex);
1822 regulator->uA_load = 0;
1823 ret = _regulator_force_disable(regulator->rdev);
1824 mutex_unlock(&rdev->mutex);
1827 while (rdev->open_count--)
1828 regulator_disable(rdev->supply);
1832 EXPORT_SYMBOL_GPL(regulator_force_disable);
1834 static void regulator_disable_work(struct work_struct *work)
1836 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1840 mutex_lock(&rdev->mutex);
1842 BUG_ON(!rdev->deferred_disables);
1844 count = rdev->deferred_disables;
1845 rdev->deferred_disables = 0;
1847 for (i = 0; i < count; i++) {
1848 ret = _regulator_disable(rdev);
1850 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1853 mutex_unlock(&rdev->mutex);
1856 for (i = 0; i < count; i++) {
1857 ret = regulator_disable(rdev->supply);
1860 "Supply disable failed: %d\n", ret);
1867 * regulator_disable_deferred - disable regulator output with delay
1868 * @regulator: regulator source
1869 * @ms: miliseconds until the regulator is disabled
1871 * Execute regulator_disable() on the regulator after a delay. This
1872 * is intended for use with devices that require some time to quiesce.
1874 * NOTE: this will only disable the regulator output if no other consumer
1875 * devices have it enabled, the regulator device supports disabling and
1876 * machine constraints permit this operation.
1878 int regulator_disable_deferred(struct regulator *regulator, int ms)
1880 struct regulator_dev *rdev = regulator->rdev;
1883 if (regulator->always_on)
1887 return regulator_disable(regulator);
1889 mutex_lock(&rdev->mutex);
1890 rdev->deferred_disables++;
1891 mutex_unlock(&rdev->mutex);
1893 ret = queue_delayed_work(system_power_efficient_wq,
1894 &rdev->disable_work,
1895 msecs_to_jiffies(ms));
1901 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1904 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1906 * @rdev: regulator to operate on
1908 * Regulators that use regmap for their register I/O can set the
1909 * enable_reg and enable_mask fields in their descriptor and then use
1910 * this as their is_enabled operation, saving some code.
1912 int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1917 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1921 if (rdev->desc->enable_is_inverted)
1922 return (val & rdev->desc->enable_mask) == 0;
1924 return (val & rdev->desc->enable_mask) != 0;
1926 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1929 * regulator_enable_regmap - standard enable() for regmap users
1931 * @rdev: regulator to operate on
1933 * Regulators that use regmap for their register I/O can set the
1934 * enable_reg and enable_mask fields in their descriptor and then use
1935 * this as their enable() operation, saving some code.
1937 int regulator_enable_regmap(struct regulator_dev *rdev)
1941 if (rdev->desc->enable_is_inverted)
1944 val = rdev->desc->enable_mask;
1946 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1947 rdev->desc->enable_mask, val);
1949 EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1952 * regulator_disable_regmap - standard disable() for regmap users
1954 * @rdev: regulator to operate on
1956 * Regulators that use regmap for their register I/O can set the
1957 * enable_reg and enable_mask fields in their descriptor and then use
1958 * this as their disable() operation, saving some code.
1960 int regulator_disable_regmap(struct regulator_dev *rdev)
1964 if (rdev->desc->enable_is_inverted)
1965 val = rdev->desc->enable_mask;
1969 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1970 rdev->desc->enable_mask, val);
1972 EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1974 static int _regulator_is_enabled(struct regulator_dev *rdev)
1976 /* A GPIO control always takes precedence */
1978 return rdev->ena_gpio_state;
1980 /* If we don't know then assume that the regulator is always on */
1981 if (!rdev->desc->ops->is_enabled)
1984 return rdev->desc->ops->is_enabled(rdev);
1988 * regulator_is_enabled - is the regulator output enabled
1989 * @regulator: regulator source
1991 * Returns positive if the regulator driver backing the source/client
1992 * has requested that the device be enabled, zero if it hasn't, else a
1993 * negative errno code.
1995 * Note that the device backing this regulator handle can have multiple
1996 * users, so it might be enabled even if regulator_enable() was never
1997 * called for this particular source.
1999 int regulator_is_enabled(struct regulator *regulator)
2003 if (regulator->always_on)
2006 mutex_lock(®ulator->rdev->mutex);
2007 ret = _regulator_is_enabled(regulator->rdev);
2008 mutex_unlock(®ulator->rdev->mutex);
2012 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2015 * regulator_can_change_voltage - check if regulator can change voltage
2016 * @regulator: regulator source
2018 * Returns positive if the regulator driver backing the source/client
2019 * can change its voltage, false otherwise. Usefull for detecting fixed
2020 * or dummy regulators and disabling voltage change logic in the client
2023 int regulator_can_change_voltage(struct regulator *regulator)
2025 struct regulator_dev *rdev = regulator->rdev;
2027 if (rdev->constraints &&
2028 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2029 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2032 if (rdev->desc->continuous_voltage_range &&
2033 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2034 rdev->constraints->min_uV != rdev->constraints->max_uV)
2040 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2043 * regulator_count_voltages - count regulator_list_voltage() selectors
2044 * @regulator: regulator source
2046 * Returns number of selectors, or negative errno. Selectors are
2047 * numbered starting at zero, and typically correspond to bitfields
2048 * in hardware registers.
2050 int regulator_count_voltages(struct regulator *regulator)
2052 struct regulator_dev *rdev = regulator->rdev;
2054 return rdev->desc->n_voltages ? : -EINVAL;
2056 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2059 * regulator_list_voltage_linear - List voltages with simple calculation
2061 * @rdev: Regulator device
2062 * @selector: Selector to convert into a voltage
2064 * Regulators with a simple linear mapping between voltages and
2065 * selectors can set min_uV and uV_step in the regulator descriptor
2066 * and then use this function as their list_voltage() operation,
2068 int regulator_list_voltage_linear(struct regulator_dev *rdev,
2069 unsigned int selector)
2071 if (selector >= rdev->desc->n_voltages)
2073 if (selector < rdev->desc->linear_min_sel)
2076 selector -= rdev->desc->linear_min_sel;
2078 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
2080 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
2083 * regulator_list_voltage_table - List voltages with table based mapping
2085 * @rdev: Regulator device
2086 * @selector: Selector to convert into a voltage
2088 * Regulators with table based mapping between voltages and
2089 * selectors can set volt_table in the regulator descriptor
2090 * and then use this function as their list_voltage() operation.
2092 int regulator_list_voltage_table(struct regulator_dev *rdev,
2093 unsigned int selector)
2095 if (!rdev->desc->volt_table) {
2096 BUG_ON(!rdev->desc->volt_table);
2100 if (selector >= rdev->desc->n_voltages)
2103 return rdev->desc->volt_table[selector];
2105 EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
2108 * regulator_list_voltage - enumerate supported voltages
2109 * @regulator: regulator source
2110 * @selector: identify voltage to list
2111 * Context: can sleep
2113 * Returns a voltage that can be passed to @regulator_set_voltage(),
2114 * zero if this selector code can't be used on this system, or a
2117 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2119 struct regulator_dev *rdev = regulator->rdev;
2120 struct regulator_ops *ops = rdev->desc->ops;
2123 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
2126 mutex_lock(&rdev->mutex);
2127 ret = ops->list_voltage(rdev, selector);
2128 mutex_unlock(&rdev->mutex);
2131 if (ret < rdev->constraints->min_uV)
2133 else if (ret > rdev->constraints->max_uV)
2139 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2142 * regulator_is_supported_voltage - check if a voltage range can be supported
2144 * @regulator: Regulator to check.
2145 * @min_uV: Minimum required voltage in uV.
2146 * @max_uV: Maximum required voltage in uV.
2148 * Returns a boolean or a negative error code.
2150 int regulator_is_supported_voltage(struct regulator *regulator,
2151 int min_uV, int max_uV)
2153 struct regulator_dev *rdev = regulator->rdev;
2154 int i, voltages, ret;
2156 /* If we can't change voltage check the current voltage */
2157 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2158 ret = regulator_get_voltage(regulator);
2160 return (min_uV <= ret && ret <= max_uV);
2165 /* Any voltage within constrains range is fine? */
2166 if (rdev->desc->continuous_voltage_range)
2167 return min_uV >= rdev->constraints->min_uV &&
2168 max_uV <= rdev->constraints->max_uV;
2170 ret = regulator_count_voltages(regulator);
2175 for (i = 0; i < voltages; i++) {
2176 ret = regulator_list_voltage(regulator, i);
2178 if (ret >= min_uV && ret <= max_uV)
2184 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2187 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2189 * @rdev: regulator to operate on
2191 * Regulators that use regmap for their register I/O can set the
2192 * vsel_reg and vsel_mask fields in their descriptor and then use this
2193 * as their get_voltage_vsel operation, saving some code.
2195 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
2200 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
2204 val &= rdev->desc->vsel_mask;
2205 val >>= ffs(rdev->desc->vsel_mask) - 1;
2209 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
2212 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2214 * @rdev: regulator to operate on
2215 * @sel: Selector to set
2217 * Regulators that use regmap for their register I/O can set the
2218 * vsel_reg and vsel_mask fields in their descriptor and then use this
2219 * as their set_voltage_vsel operation, saving some code.
2221 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
2225 sel <<= ffs(rdev->desc->vsel_mask) - 1;
2227 ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
2228 rdev->desc->vsel_mask, sel);
2232 if (rdev->desc->apply_bit)
2233 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
2234 rdev->desc->apply_bit,
2235 rdev->desc->apply_bit);
2238 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
2241 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2243 * @rdev: Regulator to operate on
2244 * @min_uV: Lower bound for voltage
2245 * @max_uV: Upper bound for voltage
2247 * Drivers implementing set_voltage_sel() and list_voltage() can use
2248 * this as their map_voltage() operation. It will find a suitable
2249 * voltage by calling list_voltage() until it gets something in bounds
2250 * for the requested voltages.
2252 int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2253 int min_uV, int max_uV)
2255 int best_val = INT_MAX;
2259 /* Find the smallest voltage that falls within the specified
2262 for (i = 0; i < rdev->desc->n_voltages; i++) {
2263 ret = rdev->desc->ops->list_voltage(rdev, i);
2267 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2273 if (best_val != INT_MAX)
2278 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2281 * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
2283 * @rdev: Regulator to operate on
2284 * @min_uV: Lower bound for voltage
2285 * @max_uV: Upper bound for voltage
2287 * Drivers that have ascendant voltage list can use this as their
2288 * map_voltage() operation.
2290 int regulator_map_voltage_ascend(struct regulator_dev *rdev,
2291 int min_uV, int max_uV)
2295 for (i = 0; i < rdev->desc->n_voltages; i++) {
2296 ret = rdev->desc->ops->list_voltage(rdev, i);
2303 if (ret >= min_uV && ret <= max_uV)
2309 EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend);
2312 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2314 * @rdev: Regulator to operate on
2315 * @min_uV: Lower bound for voltage
2316 * @max_uV: Upper bound for voltage
2318 * Drivers providing min_uV and uV_step in their regulator_desc can
2319 * use this as their map_voltage() operation.
2321 int regulator_map_voltage_linear(struct regulator_dev *rdev,
2322 int min_uV, int max_uV)
2326 /* Allow uV_step to be 0 for fixed voltage */
2327 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
2328 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
2334 if (!rdev->desc->uV_step) {
2335 BUG_ON(!rdev->desc->uV_step);
2339 if (min_uV < rdev->desc->min_uV)
2340 min_uV = rdev->desc->min_uV;
2342 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
2346 ret += rdev->desc->linear_min_sel;
2348 /* Map back into a voltage to verify we're still in bounds */
2349 voltage = rdev->desc->ops->list_voltage(rdev, ret);
2350 if (voltage < min_uV || voltage > max_uV)
2355 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2357 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2358 int min_uV, int max_uV)
2363 unsigned int selector;
2364 int old_selector = -1;
2366 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2368 min_uV += rdev->constraints->uV_offset;
2369 max_uV += rdev->constraints->uV_offset;
2372 * If we can't obtain the old selector there is not enough
2373 * info to call set_voltage_time_sel().
2375 if (_regulator_is_enabled(rdev) &&
2376 rdev->desc->ops->set_voltage_time_sel &&
2377 rdev->desc->ops->get_voltage_sel) {
2378 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2379 if (old_selector < 0)
2380 return old_selector;
2383 if (rdev->desc->ops->set_voltage) {
2384 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2388 if (rdev->desc->ops->list_voltage)
2389 best_val = rdev->desc->ops->list_voltage(rdev,
2392 best_val = _regulator_get_voltage(rdev);
2395 } else if (rdev->desc->ops->set_voltage_sel) {
2396 if (rdev->desc->ops->map_voltage) {
2397 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2400 if (rdev->desc->ops->list_voltage ==
2401 regulator_list_voltage_linear)
2402 ret = regulator_map_voltage_linear(rdev,
2405 ret = regulator_map_voltage_iterate(rdev,
2410 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2411 if (min_uV <= best_val && max_uV >= best_val) {
2413 if (old_selector == selector)
2416 ret = rdev->desc->ops->set_voltage_sel(
2426 /* Call set_voltage_time_sel if successfully obtained old_selector */
2427 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
2428 old_selector != selector && rdev->desc->ops->set_voltage_time_sel) {
2430 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2431 old_selector, selector);
2433 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2438 /* Insert any necessary delays */
2439 if (delay >= 1000) {
2440 mdelay(delay / 1000);
2441 udelay(delay % 1000);
2447 if (ret == 0 && best_val >= 0) {
2448 unsigned long data = best_val;
2450 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2454 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2460 * regulator_set_voltage - set regulator output voltage
2461 * @regulator: regulator source
2462 * @min_uV: Minimum required voltage in uV
2463 * @max_uV: Maximum acceptable voltage in uV
2465 * Sets a voltage regulator to the desired output voltage. This can be set
2466 * during any regulator state. IOW, regulator can be disabled or enabled.
2468 * If the regulator is enabled then the voltage will change to the new value
2469 * immediately otherwise if the regulator is disabled the regulator will
2470 * output at the new voltage when enabled.
2472 * NOTE: If the regulator is shared between several devices then the lowest
2473 * request voltage that meets the system constraints will be used.
2474 * Regulator system constraints must be set for this regulator before
2475 * calling this function otherwise this call will fail.
2477 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2479 struct regulator_dev *rdev = regulator->rdev;
2481 int old_min_uV, old_max_uV;
2483 mutex_lock(&rdev->mutex);
2485 /* If we're setting the same range as last time the change
2486 * should be a noop (some cpufreq implementations use the same
2487 * voltage for multiple frequencies, for example).
2489 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2493 if (!rdev->desc->ops->set_voltage &&
2494 !rdev->desc->ops->set_voltage_sel) {
2499 /* constraints check */
2500 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2504 /* restore original values in case of error */
2505 old_min_uV = regulator->min_uV;
2506 old_max_uV = regulator->max_uV;
2507 regulator->min_uV = min_uV;
2508 regulator->max_uV = max_uV;
2510 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2514 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2519 mutex_unlock(&rdev->mutex);
2522 regulator->min_uV = old_min_uV;
2523 regulator->max_uV = old_max_uV;
2524 mutex_unlock(&rdev->mutex);
2527 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2530 * regulator_set_voltage_time - get raise/fall time
2531 * @regulator: regulator source
2532 * @old_uV: starting voltage in microvolts
2533 * @new_uV: target voltage in microvolts
2535 * Provided with the starting and ending voltage, this function attempts to
2536 * calculate the time in microseconds required to rise or fall to this new
2539 int regulator_set_voltage_time(struct regulator *regulator,
2540 int old_uV, int new_uV)
2542 struct regulator_dev *rdev = regulator->rdev;
2543 struct regulator_ops *ops = rdev->desc->ops;
2549 /* Currently requires operations to do this */
2550 if (!ops->list_voltage || !ops->set_voltage_time_sel
2551 || !rdev->desc->n_voltages)
2554 for (i = 0; i < rdev->desc->n_voltages; i++) {
2555 /* We only look for exact voltage matches here */
2556 voltage = regulator_list_voltage(regulator, i);
2561 if (voltage == old_uV)
2563 if (voltage == new_uV)
2567 if (old_sel < 0 || new_sel < 0)
2570 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2572 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2575 * regulator_set_voltage_time_sel - get raise/fall time
2576 * @rdev: regulator source device
2577 * @old_selector: selector for starting voltage
2578 * @new_selector: selector for target voltage
2580 * Provided with the starting and target voltage selectors, this function
2581 * returns time in microseconds required to rise or fall to this new voltage
2583 * Drivers providing ramp_delay in regulation_constraints can use this as their
2584 * set_voltage_time_sel() operation.
2586 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2587 unsigned int old_selector,
2588 unsigned int new_selector)
2590 unsigned int ramp_delay = 0;
2591 int old_volt, new_volt;
2593 if (rdev->constraints->ramp_delay)
2594 ramp_delay = rdev->constraints->ramp_delay;
2595 else if (rdev->desc->ramp_delay)
2596 ramp_delay = rdev->desc->ramp_delay;
2598 if (ramp_delay == 0) {
2599 rdev_warn(rdev, "ramp_delay not set\n");
2604 if (!rdev->desc->ops->list_voltage)
2607 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2608 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2610 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2612 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2615 * regulator_sync_voltage - re-apply last regulator output voltage
2616 * @regulator: regulator source
2618 * Re-apply the last configured voltage. This is intended to be used
2619 * where some external control source the consumer is cooperating with
2620 * has caused the configured voltage to change.
2622 int regulator_sync_voltage(struct regulator *regulator)
2624 struct regulator_dev *rdev = regulator->rdev;
2625 int ret, min_uV, max_uV;
2627 mutex_lock(&rdev->mutex);
2629 if (!rdev->desc->ops->set_voltage &&
2630 !rdev->desc->ops->set_voltage_sel) {
2635 /* This is only going to work if we've had a voltage configured. */
2636 if (!regulator->min_uV && !regulator->max_uV) {
2641 min_uV = regulator->min_uV;
2642 max_uV = regulator->max_uV;
2644 /* This should be a paranoia check... */
2645 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2649 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2653 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2656 mutex_unlock(&rdev->mutex);
2659 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2661 static int _regulator_get_voltage(struct regulator_dev *rdev)
2665 if (rdev->desc->ops->get_voltage_sel) {
2666 sel = rdev->desc->ops->get_voltage_sel(rdev);
2669 ret = rdev->desc->ops->list_voltage(rdev, sel);
2670 } else if (rdev->desc->ops->get_voltage) {
2671 ret = rdev->desc->ops->get_voltage(rdev);
2672 } else if (rdev->desc->ops->list_voltage) {
2673 ret = rdev->desc->ops->list_voltage(rdev, 0);
2680 return ret - rdev->constraints->uV_offset;
2684 * regulator_get_voltage - get regulator output voltage
2685 * @regulator: regulator source
2687 * This returns the current regulator voltage in uV.
2689 * NOTE: If the regulator is disabled it will return the voltage value. This
2690 * function should not be used to determine regulator state.
2692 int regulator_get_voltage(struct regulator *regulator)
2696 mutex_lock(®ulator->rdev->mutex);
2698 ret = _regulator_get_voltage(regulator->rdev);
2700 mutex_unlock(®ulator->rdev->mutex);
2704 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2707 * regulator_set_current_limit - set regulator output current limit
2708 * @regulator: regulator source
2709 * @min_uA: Minimum supported current in uA
2710 * @max_uA: Maximum supported current in uA
2712 * Sets current sink to the desired output current. This can be set during
2713 * any regulator state. IOW, regulator can be disabled or enabled.
2715 * If the regulator is enabled then the current will change to the new value
2716 * immediately otherwise if the regulator is disabled the regulator will
2717 * output at the new current when enabled.
2719 * NOTE: Regulator system constraints must be set for this regulator before
2720 * calling this function otherwise this call will fail.
2722 int regulator_set_current_limit(struct regulator *regulator,
2723 int min_uA, int max_uA)
2725 struct regulator_dev *rdev = regulator->rdev;
2728 mutex_lock(&rdev->mutex);
2731 if (!rdev->desc->ops->set_current_limit) {
2736 /* constraints check */
2737 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2741 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2743 mutex_unlock(&rdev->mutex);
2746 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2748 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2752 mutex_lock(&rdev->mutex);
2755 if (!rdev->desc->ops->get_current_limit) {
2760 ret = rdev->desc->ops->get_current_limit(rdev);
2762 mutex_unlock(&rdev->mutex);
2767 * regulator_get_current_limit - get regulator output current
2768 * @regulator: regulator source
2770 * This returns the current supplied by the specified current sink in uA.
2772 * NOTE: If the regulator is disabled it will return the current value. This
2773 * function should not be used to determine regulator state.
2775 int regulator_get_current_limit(struct regulator *regulator)
2777 return _regulator_get_current_limit(regulator->rdev);
2779 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2782 * regulator_set_mode - set regulator operating mode
2783 * @regulator: regulator source
2784 * @mode: operating mode - one of the REGULATOR_MODE constants
2786 * Set regulator operating mode to increase regulator efficiency or improve
2787 * regulation performance.
2789 * NOTE: Regulator system constraints must be set for this regulator before
2790 * calling this function otherwise this call will fail.
2792 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2794 struct regulator_dev *rdev = regulator->rdev;
2796 int regulator_curr_mode;
2798 mutex_lock(&rdev->mutex);
2801 if (!rdev->desc->ops->set_mode) {
2806 /* return if the same mode is requested */
2807 if (rdev->desc->ops->get_mode) {
2808 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2809 if (regulator_curr_mode == mode) {
2815 /* constraints check */
2816 ret = regulator_mode_constrain(rdev, &mode);
2820 ret = rdev->desc->ops->set_mode(rdev, mode);
2822 mutex_unlock(&rdev->mutex);
2825 EXPORT_SYMBOL_GPL(regulator_set_mode);
2827 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2831 mutex_lock(&rdev->mutex);
2834 if (!rdev->desc->ops->get_mode) {
2839 ret = rdev->desc->ops->get_mode(rdev);
2841 mutex_unlock(&rdev->mutex);
2846 * regulator_get_mode - get regulator operating mode
2847 * @regulator: regulator source
2849 * Get the current regulator operating mode.
2851 unsigned int regulator_get_mode(struct regulator *regulator)
2853 return _regulator_get_mode(regulator->rdev);
2855 EXPORT_SYMBOL_GPL(regulator_get_mode);
2858 * regulator_set_optimum_mode - set regulator optimum operating mode
2859 * @regulator: regulator source
2860 * @uA_load: load current
2862 * Notifies the regulator core of a new device load. This is then used by
2863 * DRMS (if enabled by constraints) to set the most efficient regulator
2864 * operating mode for the new regulator loading.
2866 * Consumer devices notify their supply regulator of the maximum power
2867 * they will require (can be taken from device datasheet in the power
2868 * consumption tables) when they change operational status and hence power
2869 * state. Examples of operational state changes that can affect power
2870 * consumption are :-
2872 * o Device is opened / closed.
2873 * o Device I/O is about to begin or has just finished.
2874 * o Device is idling in between work.
2876 * This information is also exported via sysfs to userspace.
2878 * DRMS will sum the total requested load on the regulator and change
2879 * to the most efficient operating mode if platform constraints allow.
2881 * Returns the new regulator mode or error.
2883 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2885 struct regulator_dev *rdev = regulator->rdev;
2886 struct regulator *consumer;
2887 int ret, output_uV, input_uV = 0, total_uA_load = 0;
2891 input_uV = regulator_get_voltage(rdev->supply);
2893 mutex_lock(&rdev->mutex);
2896 * first check to see if we can set modes at all, otherwise just
2897 * tell the consumer everything is OK.
2899 regulator->uA_load = uA_load;
2900 ret = regulator_check_drms(rdev);
2906 if (!rdev->desc->ops->get_optimum_mode)
2910 * we can actually do this so any errors are indicators of
2911 * potential real failure.
2915 if (!rdev->desc->ops->set_mode)
2918 /* get output voltage */
2919 output_uV = _regulator_get_voltage(rdev);
2920 if (output_uV <= 0) {
2921 rdev_err(rdev, "invalid output voltage found\n");
2925 /* No supply? Use constraint voltage */
2927 input_uV = rdev->constraints->input_uV;
2928 if (input_uV <= 0) {
2929 rdev_err(rdev, "invalid input voltage found\n");
2933 /* calc total requested load for this regulator */
2934 list_for_each_entry(consumer, &rdev->consumer_list, list)
2935 total_uA_load += consumer->uA_load;
2937 mode = rdev->desc->ops->get_optimum_mode(rdev,
2938 input_uV, output_uV,
2940 ret = regulator_mode_constrain(rdev, &mode);
2942 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2943 total_uA_load, input_uV, output_uV);
2947 ret = rdev->desc->ops->set_mode(rdev, mode);
2949 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2954 mutex_unlock(&rdev->mutex);
2957 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2960 * regulator_set_bypass_regmap - Default set_bypass() using regmap
2962 * @rdev: device to operate on.
2963 * @enable: state to set.
2965 int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
2970 val = rdev->desc->bypass_mask;
2974 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
2975 rdev->desc->bypass_mask, val);
2977 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
2980 * regulator_get_bypass_regmap - Default get_bypass() using regmap
2982 * @rdev: device to operate on.
2983 * @enable: current state.
2985 int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
2990 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
2994 *enable = val & rdev->desc->bypass_mask;
2998 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
3001 * regulator_allow_bypass - allow the regulator to go into bypass mode
3003 * @regulator: Regulator to configure
3004 * @enable: enable or disable bypass mode
3006 * Allow the regulator to go into bypass mode if all other consumers
3007 * for the regulator also enable bypass mode and the machine
3008 * constraints allow this. Bypass mode means that the regulator is
3009 * simply passing the input directly to the output with no regulation.
3011 int regulator_allow_bypass(struct regulator *regulator, bool enable)
3013 struct regulator_dev *rdev = regulator->rdev;
3016 if (!rdev->desc->ops->set_bypass)
3019 if (rdev->constraints &&
3020 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3023 mutex_lock(&rdev->mutex);
3025 if (enable && !regulator->bypass) {
3026 rdev->bypass_count++;
3028 if (rdev->bypass_count == rdev->open_count) {
3029 ret = rdev->desc->ops->set_bypass(rdev, enable);
3031 rdev->bypass_count--;
3034 } else if (!enable && regulator->bypass) {
3035 rdev->bypass_count--;
3037 if (rdev->bypass_count != rdev->open_count) {
3038 ret = rdev->desc->ops->set_bypass(rdev, enable);
3040 rdev->bypass_count++;
3045 regulator->bypass = enable;
3047 mutex_unlock(&rdev->mutex);
3051 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3054 * regulator_register_notifier - register regulator event notifier
3055 * @regulator: regulator source
3056 * @nb: notifier block
3058 * Register notifier block to receive regulator events.
3060 int regulator_register_notifier(struct regulator *regulator,
3061 struct notifier_block *nb)
3063 return blocking_notifier_chain_register(®ulator->rdev->notifier,
3066 EXPORT_SYMBOL_GPL(regulator_register_notifier);
3069 * regulator_unregister_notifier - unregister regulator event notifier
3070 * @regulator: regulator source
3071 * @nb: notifier block
3073 * Unregister regulator event notifier block.
3075 int regulator_unregister_notifier(struct regulator *regulator,
3076 struct notifier_block *nb)
3078 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
3081 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3083 /* notify regulator consumers and downstream regulator consumers.
3084 * Note mutex must be held by caller.
3086 static void _notifier_call_chain(struct regulator_dev *rdev,
3087 unsigned long event, void *data)
3089 /* call rdev chain first */
3090 blocking_notifier_call_chain(&rdev->notifier, event, data);
3094 * regulator_bulk_get - get multiple regulator consumers
3096 * @dev: Device to supply
3097 * @num_consumers: Number of consumers to register
3098 * @consumers: Configuration of consumers; clients are stored here.
3100 * @return 0 on success, an errno on failure.
3102 * This helper function allows drivers to get several regulator
3103 * consumers in one operation. If any of the regulators cannot be
3104 * acquired then any regulators that were allocated will be freed
3105 * before returning to the caller.
3107 int regulator_bulk_get(struct device *dev, int num_consumers,
3108 struct regulator_bulk_data *consumers)
3113 for (i = 0; i < num_consumers; i++)
3114 consumers[i].consumer = NULL;
3116 for (i = 0; i < num_consumers; i++) {
3117 consumers[i].consumer = regulator_get(dev,
3118 consumers[i].supply);
3119 if (IS_ERR(consumers[i].consumer)) {
3120 ret = PTR_ERR(consumers[i].consumer);
3121 dev_err(dev, "Failed to get supply '%s': %d\n",
3122 consumers[i].supply, ret);
3123 consumers[i].consumer = NULL;
3132 regulator_put(consumers[i].consumer);
3136 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3139 * devm_regulator_bulk_get - managed get multiple regulator consumers
3141 * @dev: Device to supply
3142 * @num_consumers: Number of consumers to register
3143 * @consumers: Configuration of consumers; clients are stored here.
3145 * @return 0 on success, an errno on failure.
3147 * This helper function allows drivers to get several regulator
3148 * consumers in one operation with management, the regulators will
3149 * automatically be freed when the device is unbound. If any of the
3150 * regulators cannot be acquired then any regulators that were
3151 * allocated will be freed before returning to the caller.
3153 int devm_regulator_bulk_get(struct device *dev, int num_consumers,
3154 struct regulator_bulk_data *consumers)
3159 for (i = 0; i < num_consumers; i++)
3160 consumers[i].consumer = NULL;
3162 for (i = 0; i < num_consumers; i++) {
3163 consumers[i].consumer = devm_regulator_get(dev,
3164 consumers[i].supply);
3165 if (IS_ERR(consumers[i].consumer)) {
3166 ret = PTR_ERR(consumers[i].consumer);
3167 dev_err(dev, "Failed to get supply '%s': %d\n",
3168 consumers[i].supply, ret);
3169 consumers[i].consumer = NULL;
3177 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
3178 devm_regulator_put(consumers[i].consumer);
3182 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
3184 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3186 struct regulator_bulk_data *bulk = data;
3188 bulk->ret = regulator_enable(bulk->consumer);
3192 * regulator_bulk_enable - enable multiple regulator consumers
3194 * @num_consumers: Number of consumers
3195 * @consumers: Consumer data; clients are stored here.
3196 * @return 0 on success, an errno on failure
3198 * This convenience API allows consumers to enable multiple regulator
3199 * clients in a single API call. If any consumers cannot be enabled
3200 * then any others that were enabled will be disabled again prior to
3203 int regulator_bulk_enable(int num_consumers,
3204 struct regulator_bulk_data *consumers)
3206 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3210 for (i = 0; i < num_consumers; i++) {
3211 if (consumers[i].consumer->always_on)
3212 consumers[i].ret = 0;
3214 async_schedule_domain(regulator_bulk_enable_async,
3215 &consumers[i], &async_domain);
3218 async_synchronize_full_domain(&async_domain);
3220 /* If any consumer failed we need to unwind any that succeeded */
3221 for (i = 0; i < num_consumers; i++) {
3222 if (consumers[i].ret != 0) {
3223 ret = consumers[i].ret;
3231 for (i = 0; i < num_consumers; i++) {
3232 if (consumers[i].ret < 0)
3233 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3236 regulator_disable(consumers[i].consumer);
3241 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3244 * regulator_bulk_disable - disable multiple regulator consumers
3246 * @num_consumers: Number of consumers
3247 * @consumers: Consumer data; clients are stored here.
3248 * @return 0 on success, an errno on failure
3250 * This convenience API allows consumers to disable multiple regulator
3251 * clients in a single API call. If any consumers cannot be disabled
3252 * then any others that were disabled will be enabled again prior to
3255 int regulator_bulk_disable(int num_consumers,
3256 struct regulator_bulk_data *consumers)
3261 for (i = num_consumers - 1; i >= 0; --i) {
3262 ret = regulator_disable(consumers[i].consumer);
3270 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3271 for (++i; i < num_consumers; ++i) {
3272 r = regulator_enable(consumers[i].consumer);
3274 pr_err("Failed to reename %s: %d\n",
3275 consumers[i].supply, r);
3280 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3283 * regulator_bulk_force_disable - force disable multiple regulator consumers
3285 * @num_consumers: Number of consumers
3286 * @consumers: Consumer data; clients are stored here.
3287 * @return 0 on success, an errno on failure
3289 * This convenience API allows consumers to forcibly disable multiple regulator
3290 * clients in a single API call.
3291 * NOTE: This should be used for situations when device damage will
3292 * likely occur if the regulators are not disabled (e.g. over temp).
3293 * Although regulator_force_disable function call for some consumers can
3294 * return error numbers, the function is called for all consumers.
3296 int regulator_bulk_force_disable(int num_consumers,
3297 struct regulator_bulk_data *consumers)
3302 for (i = 0; i < num_consumers; i++)
3304 regulator_force_disable(consumers[i].consumer);
3306 for (i = 0; i < num_consumers; i++) {
3307 if (consumers[i].ret != 0) {
3308 ret = consumers[i].ret;
3317 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3320 * regulator_bulk_free - free multiple regulator consumers
3322 * @num_consumers: Number of consumers
3323 * @consumers: Consumer data; clients are stored here.
3325 * This convenience API allows consumers to free multiple regulator
3326 * clients in a single API call.
3328 void regulator_bulk_free(int num_consumers,
3329 struct regulator_bulk_data *consumers)
3333 for (i = 0; i < num_consumers; i++) {
3334 regulator_put(consumers[i].consumer);
3335 consumers[i].consumer = NULL;
3338 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3341 * regulator_notifier_call_chain - call regulator event notifier
3342 * @rdev: regulator source
3343 * @event: notifier block
3344 * @data: callback-specific data.
3346 * Called by regulator drivers to notify clients a regulator event has
3347 * occurred. We also notify regulator clients downstream.
3348 * Note lock must be held by caller.
3350 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3351 unsigned long event, void *data)
3353 _notifier_call_chain(rdev, event, data);
3357 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3360 * regulator_mode_to_status - convert a regulator mode into a status
3362 * @mode: Mode to convert
3364 * Convert a regulator mode into a status.
3366 int regulator_mode_to_status(unsigned int mode)
3369 case REGULATOR_MODE_FAST:
3370 return REGULATOR_STATUS_FAST;
3371 case REGULATOR_MODE_NORMAL:
3372 return REGULATOR_STATUS_NORMAL;
3373 case REGULATOR_MODE_IDLE:
3374 return REGULATOR_STATUS_IDLE;
3375 case REGULATOR_MODE_STANDBY:
3376 return REGULATOR_STATUS_STANDBY;
3378 return REGULATOR_STATUS_UNDEFINED;
3381 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3384 * To avoid cluttering sysfs (and memory) with useless state, only
3385 * create attributes that can be meaningfully displayed.
3387 static int add_regulator_attributes(struct regulator_dev *rdev)
3389 struct device *dev = &rdev->dev;
3390 struct regulator_ops *ops = rdev->desc->ops;
3393 /* some attributes need specific methods to be displayed */
3394 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3395 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3396 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) {
3397 status = device_create_file(dev, &dev_attr_microvolts);
3401 if (ops->get_current_limit) {
3402 status = device_create_file(dev, &dev_attr_microamps);
3406 if (ops->get_mode) {
3407 status = device_create_file(dev, &dev_attr_opmode);
3411 if (rdev->ena_pin || ops->is_enabled) {
3412 status = device_create_file(dev, &dev_attr_state);
3416 if (ops->get_status) {
3417 status = device_create_file(dev, &dev_attr_status);
3421 if (ops->get_bypass) {
3422 status = device_create_file(dev, &dev_attr_bypass);
3427 /* some attributes are type-specific */
3428 if (rdev->desc->type == REGULATOR_CURRENT) {
3429 status = device_create_file(dev, &dev_attr_requested_microamps);
3434 /* all the other attributes exist to support constraints;
3435 * don't show them if there are no constraints, or if the
3436 * relevant supporting methods are missing.
3438 if (!rdev->constraints)
3441 /* constraints need specific supporting methods */
3442 if (ops->set_voltage || ops->set_voltage_sel) {
3443 status = device_create_file(dev, &dev_attr_min_microvolts);
3446 status = device_create_file(dev, &dev_attr_max_microvolts);
3450 if (ops->set_current_limit) {
3451 status = device_create_file(dev, &dev_attr_min_microamps);
3454 status = device_create_file(dev, &dev_attr_max_microamps);
3459 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3462 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3465 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3469 if (ops->set_suspend_voltage) {
3470 status = device_create_file(dev,
3471 &dev_attr_suspend_standby_microvolts);
3474 status = device_create_file(dev,
3475 &dev_attr_suspend_mem_microvolts);
3478 status = device_create_file(dev,
3479 &dev_attr_suspend_disk_microvolts);
3484 if (ops->set_suspend_mode) {
3485 status = device_create_file(dev,
3486 &dev_attr_suspend_standby_mode);
3489 status = device_create_file(dev,
3490 &dev_attr_suspend_mem_mode);
3493 status = device_create_file(dev,
3494 &dev_attr_suspend_disk_mode);
3502 static void rdev_init_debugfs(struct regulator_dev *rdev)
3504 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3505 if (!rdev->debugfs) {
3506 rdev_warn(rdev, "Failed to create debugfs directory\n");
3510 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3512 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3514 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3515 &rdev->bypass_count);
3519 * regulator_register - register regulator
3520 * @regulator_desc: regulator to register
3521 * @config: runtime configuration for regulator
3523 * Called by regulator drivers to register a regulator.
3524 * Returns a valid pointer to struct regulator_dev on success
3525 * or an ERR_PTR() on error.
3527 struct regulator_dev *
3528 regulator_register(const struct regulator_desc *regulator_desc,
3529 const struct regulator_config *config)
3531 const struct regulation_constraints *constraints = NULL;
3532 const struct regulator_init_data *init_data;
3533 static atomic_t regulator_no = ATOMIC_INIT(0);
3534 struct regulator_dev *rdev;
3537 const char *supply = NULL;
3539 if (regulator_desc == NULL || config == NULL)
3540 return ERR_PTR(-EINVAL);
3545 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3546 return ERR_PTR(-EINVAL);
3548 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3549 regulator_desc->type != REGULATOR_CURRENT)
3550 return ERR_PTR(-EINVAL);
3552 /* Only one of each should be implemented */
3553 WARN_ON(regulator_desc->ops->get_voltage &&
3554 regulator_desc->ops->get_voltage_sel);
3555 WARN_ON(regulator_desc->ops->set_voltage &&
3556 regulator_desc->ops->set_voltage_sel);
3558 /* If we're using selectors we must implement list_voltage. */
3559 if (regulator_desc->ops->get_voltage_sel &&
3560 !regulator_desc->ops->list_voltage) {
3561 return ERR_PTR(-EINVAL);
3563 if (regulator_desc->ops->set_voltage_sel &&
3564 !regulator_desc->ops->list_voltage) {
3565 return ERR_PTR(-EINVAL);
3568 init_data = config->init_data;
3570 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3572 return ERR_PTR(-ENOMEM);
3574 mutex_lock(®ulator_list_mutex);
3576 mutex_init(&rdev->mutex);
3577 rdev->reg_data = config->driver_data;
3578 rdev->owner = regulator_desc->owner;
3579 rdev->desc = regulator_desc;
3581 rdev->regmap = config->regmap;
3582 else if (dev_get_regmap(dev, NULL))
3583 rdev->regmap = dev_get_regmap(dev, NULL);
3584 else if (dev->parent)
3585 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3586 INIT_LIST_HEAD(&rdev->consumer_list);
3587 INIT_LIST_HEAD(&rdev->list);
3588 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3589 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3591 /* preform any regulator specific init */
3592 if (init_data && init_data->regulator_init) {
3593 ret = init_data->regulator_init(rdev->reg_data);
3598 /* register with sysfs */
3599 rdev->dev.class = ®ulator_class;
3600 rdev->dev.of_node = config->of_node;
3601 rdev->dev.parent = dev;
3602 dev_set_name(&rdev->dev, "regulator.%d",
3603 atomic_inc_return(®ulator_no) - 1);
3604 ret = device_register(&rdev->dev);
3606 put_device(&rdev->dev);
3610 dev_set_drvdata(&rdev->dev, rdev);
3612 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3613 ret = regulator_ena_gpio_request(rdev, config);
3615 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3616 config->ena_gpio, ret);
3620 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3621 rdev->ena_gpio_state = 1;
3623 if (config->ena_gpio_invert)
3624 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3627 /* set regulator constraints */
3629 constraints = &init_data->constraints;
3631 ret = set_machine_constraints(rdev, constraints);
3635 /* add attributes supported by this regulator */
3636 ret = add_regulator_attributes(rdev);
3640 if (init_data && init_data->supply_regulator)
3641 supply = init_data->supply_regulator;
3642 else if (regulator_desc->supply_name)
3643 supply = regulator_desc->supply_name;
3646 struct regulator_dev *r;
3648 r = regulator_dev_lookup(dev, supply, &ret);
3650 if (ret == -ENODEV) {
3652 * No supply was specified for this regulator and
3653 * there will never be one.
3658 dev_err(dev, "Failed to find supply %s\n", supply);
3659 ret = -EPROBE_DEFER;
3663 ret = set_supply(rdev, r);
3667 /* Enable supply if rail is enabled */
3668 if (_regulator_is_enabled(rdev)) {
3669 ret = regulator_enable(rdev->supply);
3676 /* add consumers devices */
3678 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3679 ret = set_consumer_device_supply(rdev,
3680 init_data->consumer_supplies[i].dev_name,
3681 init_data->consumer_supplies[i].supply);
3683 dev_err(dev, "Failed to set supply %s\n",
3684 init_data->consumer_supplies[i].supply);
3685 goto unset_supplies;
3690 list_add(&rdev->list, ®ulator_list);
3692 rdev_init_debugfs(rdev);
3694 mutex_unlock(®ulator_list_mutex);
3698 unset_regulator_supplies(rdev);
3702 _regulator_put(rdev->supply);
3703 regulator_ena_gpio_free(rdev);
3704 kfree(rdev->constraints);
3706 device_unregister(&rdev->dev);
3707 /* device core frees rdev */
3708 rdev = ERR_PTR(ret);
3713 rdev = ERR_PTR(ret);
3716 EXPORT_SYMBOL_GPL(regulator_register);
3719 * regulator_unregister - unregister regulator
3720 * @rdev: regulator to unregister
3722 * Called by regulator drivers to unregister a regulator.
3724 void regulator_unregister(struct regulator_dev *rdev)
3730 regulator_put(rdev->supply);
3731 mutex_lock(®ulator_list_mutex);
3732 debugfs_remove_recursive(rdev->debugfs);
3733 flush_work(&rdev->disable_work.work);
3734 WARN_ON(rdev->open_count);
3735 unset_regulator_supplies(rdev);
3736 list_del(&rdev->list);
3737 kfree(rdev->constraints);
3738 regulator_ena_gpio_free(rdev);
3739 device_unregister(&rdev->dev);
3740 mutex_unlock(®ulator_list_mutex);
3742 EXPORT_SYMBOL_GPL(regulator_unregister);
3745 * regulator_suspend_prepare - prepare regulators for system wide suspend
3746 * @state: system suspend state
3748 * Configure each regulator with it's suspend operating parameters for state.
3749 * This will usually be called by machine suspend code prior to supending.
3751 int regulator_suspend_prepare(suspend_state_t state)
3753 struct regulator_dev *rdev;
3756 /* ON is handled by regulator active state */
3757 if (state == PM_SUSPEND_ON)
3760 mutex_lock(®ulator_list_mutex);
3761 list_for_each_entry(rdev, ®ulator_list, list) {
3763 mutex_lock(&rdev->mutex);
3764 ret = suspend_prepare(rdev, state);
3765 mutex_unlock(&rdev->mutex);
3768 rdev_err(rdev, "failed to prepare\n");
3773 mutex_unlock(®ulator_list_mutex);
3776 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3779 * regulator_suspend_finish - resume regulators from system wide suspend
3781 * Turn on regulators that might be turned off by regulator_suspend_prepare
3782 * and that should be turned on according to the regulators properties.
3784 int regulator_suspend_finish(void)
3786 struct regulator_dev *rdev;
3789 mutex_lock(®ulator_list_mutex);
3790 list_for_each_entry(rdev, ®ulator_list, list) {
3791 mutex_lock(&rdev->mutex);
3792 if (rdev->use_count > 0 || rdev->constraints->always_on) {
3793 error = _regulator_do_enable(rdev);
3797 if (!has_full_constraints)
3799 if (!_regulator_is_enabled(rdev))
3802 error = _regulator_do_disable(rdev);
3807 mutex_unlock(&rdev->mutex);
3809 mutex_unlock(®ulator_list_mutex);
3812 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3815 * regulator_has_full_constraints - the system has fully specified constraints
3817 * Calling this function will cause the regulator API to disable all
3818 * regulators which have a zero use count and don't have an always_on
3819 * constraint in a late_initcall.
3821 * The intention is that this will become the default behaviour in a
3822 * future kernel release so users are encouraged to use this facility
3825 void regulator_has_full_constraints(void)
3827 has_full_constraints = 1;
3829 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3832 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3834 * Calling this function will cause the regulator API to provide a
3835 * dummy regulator to consumers if no physical regulator is found,
3836 * allowing most consumers to proceed as though a regulator were
3837 * configured. This allows systems such as those with software
3838 * controllable regulators for the CPU core only to be brought up more
3841 void regulator_use_dummy_regulator(void)
3843 board_wants_dummy_regulator = true;
3845 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3848 * rdev_get_drvdata - get rdev regulator driver data
3851 * Get rdev regulator driver private data. This call can be used in the
3852 * regulator driver context.
3854 void *rdev_get_drvdata(struct regulator_dev *rdev)
3856 return rdev->reg_data;
3858 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3861 * regulator_get_drvdata - get regulator driver data
3862 * @regulator: regulator
3864 * Get regulator driver private data. This call can be used in the consumer
3865 * driver context when non API regulator specific functions need to be called.
3867 void *regulator_get_drvdata(struct regulator *regulator)
3869 return regulator->rdev->reg_data;
3871 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3874 * regulator_set_drvdata - set regulator driver data
3875 * @regulator: regulator
3878 void regulator_set_drvdata(struct regulator *regulator, void *data)
3880 regulator->rdev->reg_data = data;
3882 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3885 * regulator_get_id - get regulator ID
3888 int rdev_get_id(struct regulator_dev *rdev)
3890 return rdev->desc->id;
3892 EXPORT_SYMBOL_GPL(rdev_get_id);
3894 struct device *rdev_get_dev(struct regulator_dev *rdev)
3898 EXPORT_SYMBOL_GPL(rdev_get_dev);
3900 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3902 return reg_init_data->driver_data;
3904 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3906 #ifdef CONFIG_DEBUG_FS
3907 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3908 size_t count, loff_t *ppos)
3910 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3911 ssize_t len, ret = 0;
3912 struct regulator_map *map;
3917 list_for_each_entry(map, ®ulator_map_list, list) {
3918 len = snprintf(buf + ret, PAGE_SIZE - ret,
3920 rdev_get_name(map->regulator), map->dev_name,
3924 if (ret > PAGE_SIZE) {
3930 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3938 static const struct file_operations supply_map_fops = {
3939 #ifdef CONFIG_DEBUG_FS
3940 .read = supply_map_read_file,
3941 .llseek = default_llseek,
3945 #ifdef CONFIG_SLEEP_MONITOR
3946 #define REGULATOR_PRETTY_OFFSET 10
3947 #define REGULATOR_MAX_NUM 64
3948 int regulator_sleep_monitor_read64(void *priv, long long *raw_val,
3949 int check_level, int caller_type)
3951 struct regulator_dev *rdev;
3952 int temp, idx = 0, i, enabled_num = 0;
3953 long long orig_value = 0, reverse_value = 0;
3956 mutex_lock(®ulator_list_mutex);
3957 list_for_each_entry(rdev, ®ulator_list, list) {
3958 mutex_lock(&rdev->mutex);
3959 temp = _regulator_is_enabled(rdev);
3960 mutex_unlock(&rdev->mutex);
3962 enabled_num += temp;
3963 orig_value += ((long long)temp) << idx++;
3964 if(idx == REGULATOR_MAX_NUM)
3967 mutex_unlock(®ulator_list_mutex);
3969 /* Rearrange bit order to place regulator.0 to bit 0 */
3970 for (i = 0; i < idx; i++) {
3971 reverse_value |= ((orig_value & (long long)1 << i) >> i) << (idx - 1 - i);
3974 *raw_val = reverse_value;
3976 if (enabled_num > REGULATOR_PRETTY_OFFSET) {
3977 if (enabled_num >= REGULATOR_PRETTY_OFFSET + DEVICE_UNKNOWN)
3978 return DEVICE_UNKNOWN - 1;
3980 return enabled_num - REGULATOR_PRETTY_OFFSET;
3982 else /* If enabled regulator is less than REGULATOR_PRETTY_OFFSET, return 0 */
3986 static struct sleep_monitor_ops regulator_sleep_monitor_ops = {
3987 .read64_cb_func = regulator_sleep_monitor_read64,
3991 static int __init regulator_init(void)
3995 ret = class_register(®ulator_class);
3997 debugfs_root = debugfs_create_dir("regulator", NULL);
3999 pr_warn("regulator: Failed to create debugfs directory\n");
4001 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4004 regulator_dummy_init();
4006 #ifdef CONFIG_SLEEP_MONITOR
4007 sleep_monitor_register_ops(NULL, ®ulator_sleep_monitor_ops,
4008 SLEEP_MONITOR_REGULATOR);
4014 /* init early to allow our consumers to complete system booting */
4015 core_initcall(regulator_init);
4017 static int __init regulator_init_complete(void)
4019 struct regulator_dev *rdev;
4020 struct regulator_ops *ops;
4021 struct regulation_constraints *c;
4025 * Since DT doesn't provide an idiomatic mechanism for
4026 * enabling full constraints and since it's much more natural
4027 * with DT to provide them just assume that a DT enabled
4028 * system has full constraints.
4030 if (of_have_populated_dt())
4031 has_full_constraints = true;
4033 mutex_lock(®ulator_list_mutex);
4035 /* If we have a full configuration then disable any regulators
4036 * which are not in use or always_on. This will become the
4037 * default behaviour in the future.
4039 list_for_each_entry(rdev, ®ulator_list, list) {
4040 ops = rdev->desc->ops;
4041 c = rdev->constraints;
4043 if (c && c->always_on)
4046 mutex_lock(&rdev->mutex);
4048 if (rdev->use_count)
4051 /* If we can't read the status assume it's on. */
4052 if (ops->is_enabled)
4053 enabled = ops->is_enabled(rdev);
4060 if (has_full_constraints) {
4061 /* We log since this may kill the system if it
4063 rdev_info(rdev, "disabling\n");
4064 ret = _regulator_do_disable(rdev);
4066 rdev_err(rdev, "couldn't disable: %d\n", ret);
4069 /* The intention is that in future we will
4070 * assume that full constraints are provided
4071 * so warn even if we aren't going to do
4074 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4078 mutex_unlock(&rdev->mutex);
4081 mutex_unlock(®ulator_list_mutex);
4087 * not all module driver enable regulator before use at now,
4088 * and system regulators is not fixed, so always_on property is difficult to be set.
4090 #if !defined(CONFIG_ARCH_SC)
4091 //late_initcall(regulator_init_complete);