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>
27 #include <linux/gpio/consumer.h>
29 #include <linux/regmap.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/module.h>
36 #define CREATE_TRACE_POINTS
37 #include <trace/events/regulator.h>
42 #define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 #define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
53 static DEFINE_MUTEX(regulator_list_mutex);
54 static LIST_HEAD(regulator_list);
55 static LIST_HEAD(regulator_map_list);
56 static LIST_HEAD(regulator_ena_gpio_list);
57 static LIST_HEAD(regulator_supply_alias_list);
58 static bool has_full_constraints;
60 static struct dentry *debugfs_root;
63 * struct regulator_map
65 * Used to provide symbolic supply names to devices.
67 struct regulator_map {
68 struct list_head list;
69 const char *dev_name; /* The dev_name() for the consumer */
71 struct regulator_dev *regulator;
75 * struct regulator_enable_gpio
77 * Management for shared enable GPIO pin
79 struct regulator_enable_gpio {
80 struct list_head list;
81 struct gpio_desc *gpiod;
82 u32 enable_count; /* a number of enabled shared GPIO */
83 u32 request_count; /* a number of requested shared GPIO */
84 unsigned int ena_gpio_invert:1;
88 * struct regulator_supply_alias
90 * Used to map lookups for a supply onto an alternative device.
92 struct regulator_supply_alias {
93 struct list_head list;
94 struct device *src_dev;
95 const char *src_supply;
96 struct device *alias_dev;
97 const char *alias_supply;
100 static int _regulator_is_enabled(struct regulator_dev *rdev);
101 static int _regulator_disable(struct regulator_dev *rdev);
102 static int _regulator_get_voltage(struct regulator_dev *rdev);
103 static int _regulator_get_current_limit(struct regulator_dev *rdev);
104 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
105 static int _notifier_call_chain(struct regulator_dev *rdev,
106 unsigned long event, void *data);
107 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
108 int min_uV, int max_uV);
109 static struct regulator *create_regulator(struct regulator_dev *rdev,
111 const char *supply_name);
112 static void _regulator_put(struct regulator *regulator);
114 static struct regulator_dev *dev_to_rdev(struct device *dev)
116 return container_of(dev, struct regulator_dev, dev);
119 static const char *rdev_get_name(struct regulator_dev *rdev)
121 if (rdev->constraints && rdev->constraints->name)
122 return rdev->constraints->name;
123 else if (rdev->desc->name)
124 return rdev->desc->name;
129 static bool have_full_constraints(void)
131 return has_full_constraints || of_have_populated_dt();
135 * regulator_lock_supply - lock a regulator and its supplies
136 * @rdev: regulator source
138 static void regulator_lock_supply(struct regulator_dev *rdev)
140 struct regulator *supply;
144 mutex_lock_nested(&rdev->mutex, i++);
145 supply = rdev->supply;
155 * regulator_unlock_supply - unlock a regulator and its supplies
156 * @rdev: regulator source
158 static void regulator_unlock_supply(struct regulator_dev *rdev)
160 struct regulator *supply;
163 mutex_unlock(&rdev->mutex);
164 supply = rdev->supply;
174 * of_get_regulator - get a regulator device node based on supply name
175 * @dev: Device pointer for the consumer (of regulator) device
176 * @supply: regulator supply name
178 * Extract the regulator device node corresponding to the supply name.
179 * returns the device node corresponding to the regulator if found, else
182 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
184 struct device_node *regnode = NULL;
185 char prop_name[32]; /* 32 is max size of property name */
187 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
189 snprintf(prop_name, 32, "%s-supply", supply);
190 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
193 dev_dbg(dev, "Looking up %s property in node %s failed",
194 prop_name, dev->of_node->full_name);
200 static int _regulator_can_change_status(struct regulator_dev *rdev)
202 if (!rdev->constraints)
205 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
211 /* Platform voltage constraint check */
212 static int regulator_check_voltage(struct regulator_dev *rdev,
213 int *min_uV, int *max_uV)
215 BUG_ON(*min_uV > *max_uV);
217 if (!rdev->constraints) {
218 rdev_err(rdev, "no constraints\n");
221 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
222 rdev_err(rdev, "operation not allowed\n");
226 if (*max_uV > rdev->constraints->max_uV)
227 *max_uV = rdev->constraints->max_uV;
228 if (*min_uV < rdev->constraints->min_uV)
229 *min_uV = rdev->constraints->min_uV;
231 if (*min_uV > *max_uV) {
232 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
240 /* Make sure we select a voltage that suits the needs of all
241 * regulator consumers
243 static int regulator_check_consumers(struct regulator_dev *rdev,
244 int *min_uV, int *max_uV)
246 struct regulator *regulator;
248 list_for_each_entry(regulator, &rdev->consumer_list, list) {
250 * Assume consumers that didn't say anything are OK
251 * with anything in the constraint range.
253 if (!regulator->min_uV && !regulator->max_uV)
256 if (*max_uV > regulator->max_uV)
257 *max_uV = regulator->max_uV;
258 if (*min_uV < regulator->min_uV)
259 *min_uV = regulator->min_uV;
262 if (*min_uV > *max_uV) {
263 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
271 /* current constraint check */
272 static int regulator_check_current_limit(struct regulator_dev *rdev,
273 int *min_uA, int *max_uA)
275 BUG_ON(*min_uA > *max_uA);
277 if (!rdev->constraints) {
278 rdev_err(rdev, "no constraints\n");
281 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
282 rdev_err(rdev, "operation not allowed\n");
286 if (*max_uA > rdev->constraints->max_uA)
287 *max_uA = rdev->constraints->max_uA;
288 if (*min_uA < rdev->constraints->min_uA)
289 *min_uA = rdev->constraints->min_uA;
291 if (*min_uA > *max_uA) {
292 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
300 /* operating mode constraint check */
301 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
304 case REGULATOR_MODE_FAST:
305 case REGULATOR_MODE_NORMAL:
306 case REGULATOR_MODE_IDLE:
307 case REGULATOR_MODE_STANDBY:
310 rdev_err(rdev, "invalid mode %x specified\n", *mode);
314 if (!rdev->constraints) {
315 rdev_err(rdev, "no constraints\n");
318 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
319 rdev_err(rdev, "operation not allowed\n");
323 /* The modes are bitmasks, the most power hungry modes having
324 * the lowest values. If the requested mode isn't supported
325 * try higher modes. */
327 if (rdev->constraints->valid_modes_mask & *mode)
335 /* dynamic regulator mode switching constraint check */
336 static int regulator_check_drms(struct regulator_dev *rdev)
338 if (!rdev->constraints) {
339 rdev_err(rdev, "no constraints\n");
342 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
343 rdev_dbg(rdev, "operation not allowed\n");
349 static ssize_t regulator_uV_show(struct device *dev,
350 struct device_attribute *attr, char *buf)
352 struct regulator_dev *rdev = dev_get_drvdata(dev);
355 mutex_lock(&rdev->mutex);
356 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
357 mutex_unlock(&rdev->mutex);
361 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
363 static ssize_t regulator_uA_show(struct device *dev,
364 struct device_attribute *attr, char *buf)
366 struct regulator_dev *rdev = dev_get_drvdata(dev);
368 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
370 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
372 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
375 struct regulator_dev *rdev = dev_get_drvdata(dev);
377 return sprintf(buf, "%s\n", rdev_get_name(rdev));
379 static DEVICE_ATTR_RO(name);
381 static ssize_t regulator_print_opmode(char *buf, int mode)
384 case REGULATOR_MODE_FAST:
385 return sprintf(buf, "fast\n");
386 case REGULATOR_MODE_NORMAL:
387 return sprintf(buf, "normal\n");
388 case REGULATOR_MODE_IDLE:
389 return sprintf(buf, "idle\n");
390 case REGULATOR_MODE_STANDBY:
391 return sprintf(buf, "standby\n");
393 return sprintf(buf, "unknown\n");
396 static ssize_t regulator_opmode_show(struct device *dev,
397 struct device_attribute *attr, char *buf)
399 struct regulator_dev *rdev = dev_get_drvdata(dev);
401 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
403 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
405 static ssize_t regulator_print_state(char *buf, int state)
408 return sprintf(buf, "enabled\n");
410 return sprintf(buf, "disabled\n");
412 return sprintf(buf, "unknown\n");
415 static ssize_t regulator_state_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
418 struct regulator_dev *rdev = dev_get_drvdata(dev);
421 mutex_lock(&rdev->mutex);
422 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
423 mutex_unlock(&rdev->mutex);
427 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
429 static ssize_t regulator_status_show(struct device *dev,
430 struct device_attribute *attr, char *buf)
432 struct regulator_dev *rdev = dev_get_drvdata(dev);
436 status = rdev->desc->ops->get_status(rdev);
441 case REGULATOR_STATUS_OFF:
444 case REGULATOR_STATUS_ON:
447 case REGULATOR_STATUS_ERROR:
450 case REGULATOR_STATUS_FAST:
453 case REGULATOR_STATUS_NORMAL:
456 case REGULATOR_STATUS_IDLE:
459 case REGULATOR_STATUS_STANDBY:
462 case REGULATOR_STATUS_BYPASS:
465 case REGULATOR_STATUS_UNDEFINED:
472 return sprintf(buf, "%s\n", label);
474 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
476 static ssize_t regulator_min_uA_show(struct device *dev,
477 struct device_attribute *attr, char *buf)
479 struct regulator_dev *rdev = dev_get_drvdata(dev);
481 if (!rdev->constraints)
482 return sprintf(buf, "constraint not defined\n");
484 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
486 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
488 static ssize_t regulator_max_uA_show(struct device *dev,
489 struct device_attribute *attr, char *buf)
491 struct regulator_dev *rdev = dev_get_drvdata(dev);
493 if (!rdev->constraints)
494 return sprintf(buf, "constraint not defined\n");
496 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
498 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
500 static ssize_t regulator_min_uV_show(struct device *dev,
501 struct device_attribute *attr, char *buf)
503 struct regulator_dev *rdev = dev_get_drvdata(dev);
505 if (!rdev->constraints)
506 return sprintf(buf, "constraint not defined\n");
508 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
510 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
512 static ssize_t regulator_max_uV_show(struct device *dev,
513 struct device_attribute *attr, char *buf)
515 struct regulator_dev *rdev = dev_get_drvdata(dev);
517 if (!rdev->constraints)
518 return sprintf(buf, "constraint not defined\n");
520 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
522 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
524 static ssize_t regulator_total_uA_show(struct device *dev,
525 struct device_attribute *attr, char *buf)
527 struct regulator_dev *rdev = dev_get_drvdata(dev);
528 struct regulator *regulator;
531 mutex_lock(&rdev->mutex);
532 list_for_each_entry(regulator, &rdev->consumer_list, list)
533 uA += regulator->uA_load;
534 mutex_unlock(&rdev->mutex);
535 return sprintf(buf, "%d\n", uA);
537 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
539 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
542 struct regulator_dev *rdev = dev_get_drvdata(dev);
543 return sprintf(buf, "%d\n", rdev->use_count);
545 static DEVICE_ATTR_RO(num_users);
547 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
550 struct regulator_dev *rdev = dev_get_drvdata(dev);
552 switch (rdev->desc->type) {
553 case REGULATOR_VOLTAGE:
554 return sprintf(buf, "voltage\n");
555 case REGULATOR_CURRENT:
556 return sprintf(buf, "current\n");
558 return sprintf(buf, "unknown\n");
560 static DEVICE_ATTR_RO(type);
562 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
563 struct device_attribute *attr, char *buf)
565 struct regulator_dev *rdev = dev_get_drvdata(dev);
567 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
569 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
570 regulator_suspend_mem_uV_show, NULL);
572 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
573 struct device_attribute *attr, char *buf)
575 struct regulator_dev *rdev = dev_get_drvdata(dev);
577 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
579 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
580 regulator_suspend_disk_uV_show, NULL);
582 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
583 struct device_attribute *attr, char *buf)
585 struct regulator_dev *rdev = dev_get_drvdata(dev);
587 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
589 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
590 regulator_suspend_standby_uV_show, NULL);
592 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
593 struct device_attribute *attr, char *buf)
595 struct regulator_dev *rdev = dev_get_drvdata(dev);
597 return regulator_print_opmode(buf,
598 rdev->constraints->state_mem.mode);
600 static DEVICE_ATTR(suspend_mem_mode, 0444,
601 regulator_suspend_mem_mode_show, NULL);
603 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
604 struct device_attribute *attr, char *buf)
606 struct regulator_dev *rdev = dev_get_drvdata(dev);
608 return regulator_print_opmode(buf,
609 rdev->constraints->state_disk.mode);
611 static DEVICE_ATTR(suspend_disk_mode, 0444,
612 regulator_suspend_disk_mode_show, NULL);
614 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
615 struct device_attribute *attr, char *buf)
617 struct regulator_dev *rdev = dev_get_drvdata(dev);
619 return regulator_print_opmode(buf,
620 rdev->constraints->state_standby.mode);
622 static DEVICE_ATTR(suspend_standby_mode, 0444,
623 regulator_suspend_standby_mode_show, NULL);
625 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
626 struct device_attribute *attr, char *buf)
628 struct regulator_dev *rdev = dev_get_drvdata(dev);
630 return regulator_print_state(buf,
631 rdev->constraints->state_mem.enabled);
633 static DEVICE_ATTR(suspend_mem_state, 0444,
634 regulator_suspend_mem_state_show, NULL);
636 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
637 struct device_attribute *attr, char *buf)
639 struct regulator_dev *rdev = dev_get_drvdata(dev);
641 return regulator_print_state(buf,
642 rdev->constraints->state_disk.enabled);
644 static DEVICE_ATTR(suspend_disk_state, 0444,
645 regulator_suspend_disk_state_show, NULL);
647 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
648 struct device_attribute *attr, char *buf)
650 struct regulator_dev *rdev = dev_get_drvdata(dev);
652 return regulator_print_state(buf,
653 rdev->constraints->state_standby.enabled);
655 static DEVICE_ATTR(suspend_standby_state, 0444,
656 regulator_suspend_standby_state_show, NULL);
658 static ssize_t regulator_bypass_show(struct device *dev,
659 struct device_attribute *attr, char *buf)
661 struct regulator_dev *rdev = dev_get_drvdata(dev);
666 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
675 return sprintf(buf, "%s\n", report);
677 static DEVICE_ATTR(bypass, 0444,
678 regulator_bypass_show, NULL);
680 /* Calculate the new optimum regulator operating mode based on the new total
681 * consumer load. All locks held by caller */
682 static int drms_uA_update(struct regulator_dev *rdev)
684 struct regulator *sibling;
685 int current_uA = 0, output_uV, input_uV, err;
688 lockdep_assert_held_once(&rdev->mutex);
691 * first check to see if we can set modes at all, otherwise just
692 * tell the consumer everything is OK.
694 err = regulator_check_drms(rdev);
698 if (!rdev->desc->ops->get_optimum_mode &&
699 !rdev->desc->ops->set_load)
702 if (!rdev->desc->ops->set_mode &&
703 !rdev->desc->ops->set_load)
706 /* get output voltage */
707 output_uV = _regulator_get_voltage(rdev);
708 if (output_uV <= 0) {
709 rdev_err(rdev, "invalid output voltage found\n");
713 /* get input voltage */
716 input_uV = regulator_get_voltage(rdev->supply);
718 input_uV = rdev->constraints->input_uV;
720 rdev_err(rdev, "invalid input voltage found\n");
724 /* calc total requested load */
725 list_for_each_entry(sibling, &rdev->consumer_list, list)
726 current_uA += sibling->uA_load;
728 current_uA += rdev->constraints->system_load;
730 if (rdev->desc->ops->set_load) {
731 /* set the optimum mode for our new total regulator load */
732 err = rdev->desc->ops->set_load(rdev, current_uA);
734 rdev_err(rdev, "failed to set load %d\n", current_uA);
736 /* now get the optimum mode for our new total regulator load */
737 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
738 output_uV, current_uA);
740 /* check the new mode is allowed */
741 err = regulator_mode_constrain(rdev, &mode);
743 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
744 current_uA, input_uV, output_uV);
748 err = rdev->desc->ops->set_mode(rdev, mode);
750 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
756 static int suspend_set_state(struct regulator_dev *rdev,
757 struct regulator_state *rstate)
761 /* If we have no suspend mode configration don't set anything;
762 * only warn if the driver implements set_suspend_voltage or
763 * set_suspend_mode callback.
765 if (!rstate->enabled && !rstate->disabled) {
766 if (rdev->desc->ops->set_suspend_voltage ||
767 rdev->desc->ops->set_suspend_mode)
768 rdev_warn(rdev, "No configuration\n");
772 if (rstate->enabled && rstate->disabled) {
773 rdev_err(rdev, "invalid configuration\n");
777 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
778 ret = rdev->desc->ops->set_suspend_enable(rdev);
779 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
780 ret = rdev->desc->ops->set_suspend_disable(rdev);
781 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
785 rdev_err(rdev, "failed to enabled/disable\n");
789 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
790 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
792 rdev_err(rdev, "failed to set voltage\n");
797 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
798 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
800 rdev_err(rdev, "failed to set mode\n");
807 /* locks held by caller */
808 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
810 lockdep_assert_held_once(&rdev->mutex);
812 if (!rdev->constraints)
816 case PM_SUSPEND_STANDBY:
817 return suspend_set_state(rdev,
818 &rdev->constraints->state_standby);
820 return suspend_set_state(rdev,
821 &rdev->constraints->state_mem);
823 return suspend_set_state(rdev,
824 &rdev->constraints->state_disk);
830 static void print_constraints(struct regulator_dev *rdev)
832 struct regulation_constraints *constraints = rdev->constraints;
834 size_t len = sizeof(buf) - 1;
838 if (constraints->min_uV && constraints->max_uV) {
839 if (constraints->min_uV == constraints->max_uV)
840 count += scnprintf(buf + count, len - count, "%d mV ",
841 constraints->min_uV / 1000);
843 count += scnprintf(buf + count, len - count,
845 constraints->min_uV / 1000,
846 constraints->max_uV / 1000);
849 if (!constraints->min_uV ||
850 constraints->min_uV != constraints->max_uV) {
851 ret = _regulator_get_voltage(rdev);
853 count += scnprintf(buf + count, len - count,
854 "at %d mV ", ret / 1000);
857 if (constraints->uV_offset)
858 count += scnprintf(buf + count, len - count, "%dmV offset ",
859 constraints->uV_offset / 1000);
861 if (constraints->min_uA && constraints->max_uA) {
862 if (constraints->min_uA == constraints->max_uA)
863 count += scnprintf(buf + count, len - count, "%d mA ",
864 constraints->min_uA / 1000);
866 count += scnprintf(buf + count, len - count,
868 constraints->min_uA / 1000,
869 constraints->max_uA / 1000);
872 if (!constraints->min_uA ||
873 constraints->min_uA != constraints->max_uA) {
874 ret = _regulator_get_current_limit(rdev);
876 count += scnprintf(buf + count, len - count,
877 "at %d mA ", ret / 1000);
880 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
881 count += scnprintf(buf + count, len - count, "fast ");
882 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
883 count += scnprintf(buf + count, len - count, "normal ");
884 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
885 count += scnprintf(buf + count, len - count, "idle ");
886 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
887 count += scnprintf(buf + count, len - count, "standby");
890 scnprintf(buf, len, "no parameters");
892 rdev_dbg(rdev, "%s\n", buf);
894 if ((constraints->min_uV != constraints->max_uV) &&
895 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
897 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
900 static int machine_constraints_voltage(struct regulator_dev *rdev,
901 struct regulation_constraints *constraints)
903 const struct regulator_ops *ops = rdev->desc->ops;
906 /* do we need to apply the constraint voltage */
907 if (rdev->constraints->apply_uV &&
908 rdev->constraints->min_uV == rdev->constraints->max_uV) {
909 int current_uV = _regulator_get_voltage(rdev);
910 if (current_uV < 0) {
912 "failed to get the current voltage(%d)\n",
916 if (current_uV < rdev->constraints->min_uV ||
917 current_uV > rdev->constraints->max_uV) {
918 ret = _regulator_do_set_voltage(
919 rdev, rdev->constraints->min_uV,
920 rdev->constraints->max_uV);
923 "failed to apply %duV constraint(%d)\n",
924 rdev->constraints->min_uV, ret);
930 /* constrain machine-level voltage specs to fit
931 * the actual range supported by this regulator.
933 if (ops->list_voltage && rdev->desc->n_voltages) {
934 int count = rdev->desc->n_voltages;
936 int min_uV = INT_MAX;
937 int max_uV = INT_MIN;
938 int cmin = constraints->min_uV;
939 int cmax = constraints->max_uV;
941 /* it's safe to autoconfigure fixed-voltage supplies
942 and the constraints are used by list_voltage. */
943 if (count == 1 && !cmin) {
946 constraints->min_uV = cmin;
947 constraints->max_uV = cmax;
950 /* voltage constraints are optional */
951 if ((cmin == 0) && (cmax == 0))
954 /* else require explicit machine-level constraints */
955 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
956 rdev_err(rdev, "invalid voltage constraints\n");
960 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
961 for (i = 0; i < count; i++) {
964 value = ops->list_voltage(rdev, i);
968 /* maybe adjust [min_uV..max_uV] */
969 if (value >= cmin && value < min_uV)
971 if (value <= cmax && value > max_uV)
975 /* final: [min_uV..max_uV] valid iff constraints valid */
976 if (max_uV < min_uV) {
978 "unsupportable voltage constraints %u-%uuV\n",
983 /* use regulator's subset of machine constraints */
984 if (constraints->min_uV < min_uV) {
985 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
986 constraints->min_uV, min_uV);
987 constraints->min_uV = min_uV;
989 if (constraints->max_uV > max_uV) {
990 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
991 constraints->max_uV, max_uV);
992 constraints->max_uV = max_uV;
999 static int machine_constraints_current(struct regulator_dev *rdev,
1000 struct regulation_constraints *constraints)
1002 const struct regulator_ops *ops = rdev->desc->ops;
1005 if (!constraints->min_uA && !constraints->max_uA)
1008 if (constraints->min_uA > constraints->max_uA) {
1009 rdev_err(rdev, "Invalid current constraints\n");
1013 if (!ops->set_current_limit || !ops->get_current_limit) {
1014 rdev_warn(rdev, "Operation of current configuration missing\n");
1018 /* Set regulator current in constraints range */
1019 ret = ops->set_current_limit(rdev, constraints->min_uA,
1020 constraints->max_uA);
1022 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1029 static int _regulator_do_enable(struct regulator_dev *rdev);
1032 * set_machine_constraints - sets regulator constraints
1033 * @rdev: regulator source
1034 * @constraints: constraints to apply
1036 * Allows platform initialisation code to define and constrain
1037 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1038 * Constraints *must* be set by platform code in order for some
1039 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1042 static int set_machine_constraints(struct regulator_dev *rdev,
1043 const struct regulation_constraints *constraints)
1046 const struct regulator_ops *ops = rdev->desc->ops;
1049 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1052 rdev->constraints = kzalloc(sizeof(*constraints),
1054 if (!rdev->constraints)
1057 ret = machine_constraints_voltage(rdev, rdev->constraints);
1061 ret = machine_constraints_current(rdev, rdev->constraints);
1065 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1066 ret = ops->set_input_current_limit(rdev,
1067 rdev->constraints->ilim_uA);
1069 rdev_err(rdev, "failed to set input limit\n");
1074 /* do we need to setup our suspend state */
1075 if (rdev->constraints->initial_state) {
1076 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1078 rdev_err(rdev, "failed to set suspend state\n");
1083 if (rdev->constraints->initial_mode) {
1084 if (!ops->set_mode) {
1085 rdev_err(rdev, "no set_mode operation\n");
1090 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1092 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1097 /* If the constraints say the regulator should be on at this point
1098 * and we have control then make sure it is enabled.
1100 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1101 ret = _regulator_do_enable(rdev);
1102 if (ret < 0 && ret != -EINVAL) {
1103 rdev_err(rdev, "failed to enable\n");
1108 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1109 && ops->set_ramp_delay) {
1110 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1112 rdev_err(rdev, "failed to set ramp_delay\n");
1117 if (rdev->constraints->pull_down && ops->set_pull_down) {
1118 ret = ops->set_pull_down(rdev);
1120 rdev_err(rdev, "failed to set pull down\n");
1125 if (rdev->constraints->soft_start && ops->set_soft_start) {
1126 ret = ops->set_soft_start(rdev);
1128 rdev_err(rdev, "failed to set soft start\n");
1133 if (rdev->constraints->over_current_protection
1134 && ops->set_over_current_protection) {
1135 ret = ops->set_over_current_protection(rdev);
1137 rdev_err(rdev, "failed to set over current protection\n");
1142 print_constraints(rdev);
1145 kfree(rdev->constraints);
1146 rdev->constraints = NULL;
1151 * set_supply - set regulator supply regulator
1152 * @rdev: regulator name
1153 * @supply_rdev: supply regulator name
1155 * Called by platform initialisation code to set the supply regulator for this
1156 * regulator. This ensures that a regulators supply will also be enabled by the
1157 * core if it's child is enabled.
1159 static int set_supply(struct regulator_dev *rdev,
1160 struct regulator_dev *supply_rdev)
1164 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1166 if (!try_module_get(supply_rdev->owner))
1169 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1170 if (rdev->supply == NULL) {
1174 supply_rdev->open_count++;
1180 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1181 * @rdev: regulator source
1182 * @consumer_dev_name: dev_name() string for device supply applies to
1183 * @supply: symbolic name for supply
1185 * Allows platform initialisation code to map physical regulator
1186 * sources to symbolic names for supplies for use by devices. Devices
1187 * should use these symbolic names to request regulators, avoiding the
1188 * need to provide board-specific regulator names as platform data.
1190 static int set_consumer_device_supply(struct regulator_dev *rdev,
1191 const char *consumer_dev_name,
1194 struct regulator_map *node;
1200 if (consumer_dev_name != NULL)
1205 list_for_each_entry(node, ®ulator_map_list, list) {
1206 if (node->dev_name && consumer_dev_name) {
1207 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1209 } else if (node->dev_name || consumer_dev_name) {
1213 if (strcmp(node->supply, supply) != 0)
1216 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1218 dev_name(&node->regulator->dev),
1219 node->regulator->desc->name,
1221 dev_name(&rdev->dev), rdev_get_name(rdev));
1225 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1229 node->regulator = rdev;
1230 node->supply = supply;
1233 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1234 if (node->dev_name == NULL) {
1240 list_add(&node->list, ®ulator_map_list);
1244 static void unset_regulator_supplies(struct regulator_dev *rdev)
1246 struct regulator_map *node, *n;
1248 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1249 if (rdev == node->regulator) {
1250 list_del(&node->list);
1251 kfree(node->dev_name);
1257 #define REG_STR_SIZE 64
1259 static struct regulator *create_regulator(struct regulator_dev *rdev,
1261 const char *supply_name)
1263 struct regulator *regulator;
1264 char buf[REG_STR_SIZE];
1267 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1268 if (regulator == NULL)
1271 mutex_lock(&rdev->mutex);
1272 regulator->rdev = rdev;
1273 list_add(®ulator->list, &rdev->consumer_list);
1276 regulator->dev = dev;
1278 /* Add a link to the device sysfs entry */
1279 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1280 dev->kobj.name, supply_name);
1281 if (size >= REG_STR_SIZE)
1284 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1285 if (regulator->supply_name == NULL)
1288 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1291 rdev_dbg(rdev, "could not add device link %s err %d\n",
1292 dev->kobj.name, err);
1296 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1297 if (regulator->supply_name == NULL)
1301 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1303 if (!regulator->debugfs) {
1304 rdev_dbg(rdev, "Failed to create debugfs directory\n");
1306 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1307 ®ulator->uA_load);
1308 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1309 ®ulator->min_uV);
1310 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1311 ®ulator->max_uV);
1315 * Check now if the regulator is an always on regulator - if
1316 * it is then we don't need to do nearly so much work for
1317 * enable/disable calls.
1319 if (!_regulator_can_change_status(rdev) &&
1320 _regulator_is_enabled(rdev))
1321 regulator->always_on = true;
1323 mutex_unlock(&rdev->mutex);
1326 list_del(®ulator->list);
1328 mutex_unlock(&rdev->mutex);
1332 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1334 if (rdev->constraints && rdev->constraints->enable_time)
1335 return rdev->constraints->enable_time;
1336 if (!rdev->desc->ops->enable_time)
1337 return rdev->desc->enable_time;
1338 return rdev->desc->ops->enable_time(rdev);
1341 static struct regulator_supply_alias *regulator_find_supply_alias(
1342 struct device *dev, const char *supply)
1344 struct regulator_supply_alias *map;
1346 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1347 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1353 static void regulator_supply_alias(struct device **dev, const char **supply)
1355 struct regulator_supply_alias *map;
1357 map = regulator_find_supply_alias(*dev, *supply);
1359 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1360 *supply, map->alias_supply,
1361 dev_name(map->alias_dev));
1362 *dev = map->alias_dev;
1363 *supply = map->alias_supply;
1367 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1371 struct regulator_dev *r;
1372 struct device_node *node;
1373 struct regulator_map *map;
1374 const char *devname = NULL;
1376 regulator_supply_alias(&dev, &supply);
1378 /* first do a dt based lookup */
1379 if (dev && dev->of_node) {
1380 node = of_get_regulator(dev, supply);
1382 list_for_each_entry(r, ®ulator_list, list)
1383 if (r->dev.parent &&
1384 node == r->dev.of_node)
1386 *ret = -EPROBE_DEFER;
1390 * If we couldn't even get the node then it's
1391 * not just that the device didn't register
1392 * yet, there's no node and we'll never
1399 /* if not found, try doing it non-dt way */
1401 devname = dev_name(dev);
1403 list_for_each_entry(r, ®ulator_list, list)
1404 if (strcmp(rdev_get_name(r), supply) == 0)
1407 list_for_each_entry(map, ®ulator_map_list, list) {
1408 /* If the mapping has a device set up it must match */
1409 if (map->dev_name &&
1410 (!devname || strcmp(map->dev_name, devname)))
1413 if (strcmp(map->supply, supply) == 0)
1414 return map->regulator;
1421 static int regulator_resolve_supply(struct regulator_dev *rdev)
1423 struct regulator_dev *r;
1424 struct device *dev = rdev->dev.parent;
1427 /* No supply to resovle? */
1428 if (!rdev->supply_name)
1431 /* Supply already resolved? */
1435 r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
1436 if (ret == -ENODEV) {
1438 * No supply was specified for this regulator and
1439 * there will never be one.
1445 if (have_full_constraints()) {
1446 r = dummy_regulator_rdev;
1448 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1449 rdev->supply_name, rdev->desc->name);
1450 return -EPROBE_DEFER;
1454 /* Recursively resolve the supply of the supply */
1455 ret = regulator_resolve_supply(r);
1459 ret = set_supply(rdev, r);
1463 /* Cascade always-on state to supply */
1464 if (_regulator_is_enabled(rdev)) {
1465 ret = regulator_enable(rdev->supply);
1468 _regulator_put(rdev->supply);
1476 /* Internal regulator request function */
1477 static struct regulator *_regulator_get(struct device *dev, const char *id,
1478 bool exclusive, bool allow_dummy)
1480 struct regulator_dev *rdev;
1481 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1482 const char *devname = NULL;
1486 pr_err("get() with no identifier\n");
1487 return ERR_PTR(-EINVAL);
1491 devname = dev_name(dev);
1493 if (have_full_constraints())
1496 ret = -EPROBE_DEFER;
1498 mutex_lock(®ulator_list_mutex);
1500 rdev = regulator_dev_lookup(dev, id, &ret);
1504 regulator = ERR_PTR(ret);
1507 * If we have return value from dev_lookup fail, we do not expect to
1508 * succeed, so, quit with appropriate error value
1510 if (ret && ret != -ENODEV)
1514 devname = "deviceless";
1517 * Assume that a regulator is physically present and enabled
1518 * even if it isn't hooked up and just provide a dummy.
1520 if (have_full_constraints() && allow_dummy) {
1521 pr_warn("%s supply %s not found, using dummy regulator\n",
1524 rdev = dummy_regulator_rdev;
1526 /* Don't log an error when called from regulator_get_optional() */
1527 } else if (!have_full_constraints() || exclusive) {
1528 dev_warn(dev, "dummy supplies not allowed\n");
1531 mutex_unlock(®ulator_list_mutex);
1535 if (rdev->exclusive) {
1536 regulator = ERR_PTR(-EPERM);
1540 if (exclusive && rdev->open_count) {
1541 regulator = ERR_PTR(-EBUSY);
1545 ret = regulator_resolve_supply(rdev);
1547 regulator = ERR_PTR(ret);
1551 if (!try_module_get(rdev->owner))
1554 regulator = create_regulator(rdev, dev, id);
1555 if (regulator == NULL) {
1556 regulator = ERR_PTR(-ENOMEM);
1557 module_put(rdev->owner);
1563 rdev->exclusive = 1;
1565 ret = _regulator_is_enabled(rdev);
1567 rdev->use_count = 1;
1569 rdev->use_count = 0;
1573 mutex_unlock(®ulator_list_mutex);
1579 * regulator_get - lookup and obtain a reference to a regulator.
1580 * @dev: device for regulator "consumer"
1581 * @id: Supply name or regulator ID.
1583 * Returns a struct regulator corresponding to the regulator producer,
1584 * or IS_ERR() condition containing errno.
1586 * Use of supply names configured via regulator_set_device_supply() is
1587 * strongly encouraged. It is recommended that the supply name used
1588 * should match the name used for the supply and/or the relevant
1589 * device pins in the datasheet.
1591 struct regulator *regulator_get(struct device *dev, const char *id)
1593 return _regulator_get(dev, id, false, true);
1595 EXPORT_SYMBOL_GPL(regulator_get);
1598 * regulator_get_exclusive - obtain exclusive access to a regulator.
1599 * @dev: device for regulator "consumer"
1600 * @id: Supply name or regulator ID.
1602 * Returns a struct regulator corresponding to the regulator producer,
1603 * or IS_ERR() condition containing errno. Other consumers will be
1604 * unable to obtain this regulator while this reference is held and the
1605 * use count for the regulator will be initialised to reflect the current
1606 * state of the regulator.
1608 * This is intended for use by consumers which cannot tolerate shared
1609 * use of the regulator such as those which need to force the
1610 * regulator off for correct operation of the hardware they are
1613 * Use of supply names configured via regulator_set_device_supply() is
1614 * strongly encouraged. It is recommended that the supply name used
1615 * should match the name used for the supply and/or the relevant
1616 * device pins in the datasheet.
1618 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1620 return _regulator_get(dev, id, true, false);
1622 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1625 * regulator_get_optional - obtain optional access to a regulator.
1626 * @dev: device for regulator "consumer"
1627 * @id: Supply name or regulator ID.
1629 * Returns a struct regulator corresponding to the regulator producer,
1630 * or IS_ERR() condition containing errno.
1632 * This is intended for use by consumers for devices which can have
1633 * some supplies unconnected in normal use, such as some MMC devices.
1634 * It can allow the regulator core to provide stub supplies for other
1635 * supplies requested using normal regulator_get() calls without
1636 * disrupting the operation of drivers that can handle absent
1639 * Use of supply names configured via regulator_set_device_supply() is
1640 * strongly encouraged. It is recommended that the supply name used
1641 * should match the name used for the supply and/or the relevant
1642 * device pins in the datasheet.
1644 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1646 return _regulator_get(dev, id, false, false);
1648 EXPORT_SYMBOL_GPL(regulator_get_optional);
1650 /* regulator_list_mutex lock held by regulator_put() */
1651 static void _regulator_put(struct regulator *regulator)
1653 struct regulator_dev *rdev;
1655 if (IS_ERR_OR_NULL(regulator))
1658 lockdep_assert_held_once(®ulator_list_mutex);
1660 rdev = regulator->rdev;
1662 debugfs_remove_recursive(regulator->debugfs);
1664 /* remove any sysfs entries */
1666 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1667 mutex_lock(&rdev->mutex);
1668 list_del(®ulator->list);
1671 rdev->exclusive = 0;
1672 mutex_unlock(&rdev->mutex);
1674 kfree(regulator->supply_name);
1677 module_put(rdev->owner);
1681 * regulator_put - "free" the regulator source
1682 * @regulator: regulator source
1684 * Note: drivers must ensure that all regulator_enable calls made on this
1685 * regulator source are balanced by regulator_disable calls prior to calling
1688 void regulator_put(struct regulator *regulator)
1690 mutex_lock(®ulator_list_mutex);
1691 _regulator_put(regulator);
1692 mutex_unlock(®ulator_list_mutex);
1694 EXPORT_SYMBOL_GPL(regulator_put);
1697 * regulator_register_supply_alias - Provide device alias for supply lookup
1699 * @dev: device that will be given as the regulator "consumer"
1700 * @id: Supply name or regulator ID
1701 * @alias_dev: device that should be used to lookup the supply
1702 * @alias_id: Supply name or regulator ID that should be used to lookup the
1705 * All lookups for id on dev will instead be conducted for alias_id on
1708 int regulator_register_supply_alias(struct device *dev, const char *id,
1709 struct device *alias_dev,
1710 const char *alias_id)
1712 struct regulator_supply_alias *map;
1714 map = regulator_find_supply_alias(dev, id);
1718 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1723 map->src_supply = id;
1724 map->alias_dev = alias_dev;
1725 map->alias_supply = alias_id;
1727 list_add(&map->list, ®ulator_supply_alias_list);
1729 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1730 id, dev_name(dev), alias_id, dev_name(alias_dev));
1734 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1737 * regulator_unregister_supply_alias - Remove device alias
1739 * @dev: device that will be given as the regulator "consumer"
1740 * @id: Supply name or regulator ID
1742 * Remove a lookup alias if one exists for id on dev.
1744 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1746 struct regulator_supply_alias *map;
1748 map = regulator_find_supply_alias(dev, id);
1750 list_del(&map->list);
1754 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1757 * regulator_bulk_register_supply_alias - register multiple aliases
1759 * @dev: device that will be given as the regulator "consumer"
1760 * @id: List of supply names or regulator IDs
1761 * @alias_dev: device that should be used to lookup the supply
1762 * @alias_id: List of supply names or regulator IDs that should be used to
1764 * @num_id: Number of aliases to register
1766 * @return 0 on success, an errno on failure.
1768 * This helper function allows drivers to register several supply
1769 * aliases in one operation. If any of the aliases cannot be
1770 * registered any aliases that were registered will be removed
1771 * before returning to the caller.
1773 int regulator_bulk_register_supply_alias(struct device *dev,
1774 const char *const *id,
1775 struct device *alias_dev,
1776 const char *const *alias_id,
1782 for (i = 0; i < num_id; ++i) {
1783 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1793 "Failed to create supply alias %s,%s -> %s,%s\n",
1794 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1797 regulator_unregister_supply_alias(dev, id[i]);
1801 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1804 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1806 * @dev: device that will be given as the regulator "consumer"
1807 * @id: List of supply names or regulator IDs
1808 * @num_id: Number of aliases to unregister
1810 * This helper function allows drivers to unregister several supply
1811 * aliases in one operation.
1813 void regulator_bulk_unregister_supply_alias(struct device *dev,
1814 const char *const *id,
1819 for (i = 0; i < num_id; ++i)
1820 regulator_unregister_supply_alias(dev, id[i]);
1822 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1825 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1826 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1827 const struct regulator_config *config)
1829 struct regulator_enable_gpio *pin;
1830 struct gpio_desc *gpiod;
1833 gpiod = gpio_to_desc(config->ena_gpio);
1835 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1836 if (pin->gpiod == gpiod) {
1837 rdev_dbg(rdev, "GPIO %d is already used\n",
1839 goto update_ena_gpio_to_rdev;
1843 ret = gpio_request_one(config->ena_gpio,
1844 GPIOF_DIR_OUT | config->ena_gpio_flags,
1845 rdev_get_name(rdev));
1849 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1851 gpio_free(config->ena_gpio);
1856 pin->ena_gpio_invert = config->ena_gpio_invert;
1857 list_add(&pin->list, ®ulator_ena_gpio_list);
1859 update_ena_gpio_to_rdev:
1860 pin->request_count++;
1861 rdev->ena_pin = pin;
1865 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1867 struct regulator_enable_gpio *pin, *n;
1872 /* Free the GPIO only in case of no use */
1873 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
1874 if (pin->gpiod == rdev->ena_pin->gpiod) {
1875 if (pin->request_count <= 1) {
1876 pin->request_count = 0;
1877 gpiod_put(pin->gpiod);
1878 list_del(&pin->list);
1880 rdev->ena_pin = NULL;
1883 pin->request_count--;
1890 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1891 * @rdev: regulator_dev structure
1892 * @enable: enable GPIO at initial use?
1894 * GPIO is enabled in case of initial use. (enable_count is 0)
1895 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1897 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1899 struct regulator_enable_gpio *pin = rdev->ena_pin;
1905 /* Enable GPIO at initial use */
1906 if (pin->enable_count == 0)
1907 gpiod_set_value_cansleep(pin->gpiod,
1908 !pin->ena_gpio_invert);
1910 pin->enable_count++;
1912 if (pin->enable_count > 1) {
1913 pin->enable_count--;
1917 /* Disable GPIO if not used */
1918 if (pin->enable_count <= 1) {
1919 gpiod_set_value_cansleep(pin->gpiod,
1920 pin->ena_gpio_invert);
1921 pin->enable_count = 0;
1929 * _regulator_enable_delay - a delay helper function
1930 * @delay: time to delay in microseconds
1932 * Delay for the requested amount of time as per the guidelines in:
1934 * Documentation/timers/timers-howto.txt
1936 * The assumption here is that regulators will never be enabled in
1937 * atomic context and therefore sleeping functions can be used.
1939 static void _regulator_enable_delay(unsigned int delay)
1941 unsigned int ms = delay / 1000;
1942 unsigned int us = delay % 1000;
1946 * For small enough values, handle super-millisecond
1947 * delays in the usleep_range() call below.
1956 * Give the scheduler some room to coalesce with any other
1957 * wakeup sources. For delays shorter than 10 us, don't even
1958 * bother setting up high-resolution timers and just busy-
1962 usleep_range(us, us + 100);
1967 static int _regulator_do_enable(struct regulator_dev *rdev)
1971 /* Query before enabling in case configuration dependent. */
1972 ret = _regulator_get_enable_time(rdev);
1976 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1980 trace_regulator_enable(rdev_get_name(rdev));
1982 if (rdev->desc->off_on_delay) {
1983 /* if needed, keep a distance of off_on_delay from last time
1984 * this regulator was disabled.
1986 unsigned long start_jiffy = jiffies;
1987 unsigned long intended, max_delay, remaining;
1989 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
1990 intended = rdev->last_off_jiffy + max_delay;
1992 if (time_before(start_jiffy, intended)) {
1993 /* calc remaining jiffies to deal with one-time
1995 * in case of multiple timer wrapping, either it can be
1996 * detected by out-of-range remaining, or it cannot be
1997 * detected and we gets a panelty of
1998 * _regulator_enable_delay().
2000 remaining = intended - start_jiffy;
2001 if (remaining <= max_delay)
2002 _regulator_enable_delay(
2003 jiffies_to_usecs(remaining));
2007 if (rdev->ena_pin) {
2008 if (!rdev->ena_gpio_state) {
2009 ret = regulator_ena_gpio_ctrl(rdev, true);
2012 rdev->ena_gpio_state = 1;
2014 } else if (rdev->desc->ops->enable) {
2015 ret = rdev->desc->ops->enable(rdev);
2022 /* Allow the regulator to ramp; it would be useful to extend
2023 * this for bulk operations so that the regulators can ramp
2025 trace_regulator_enable_delay(rdev_get_name(rdev));
2027 _regulator_enable_delay(delay);
2029 trace_regulator_enable_complete(rdev_get_name(rdev));
2034 /* locks held by regulator_enable() */
2035 static int _regulator_enable(struct regulator_dev *rdev)
2039 lockdep_assert_held_once(&rdev->mutex);
2041 /* check voltage and requested load before enabling */
2042 if (rdev->constraints &&
2043 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
2044 drms_uA_update(rdev);
2046 if (rdev->use_count == 0) {
2047 /* The regulator may on if it's not switchable or left on */
2048 ret = _regulator_is_enabled(rdev);
2049 if (ret == -EINVAL || ret == 0) {
2050 if (!_regulator_can_change_status(rdev))
2053 ret = _regulator_do_enable(rdev);
2057 } else if (ret < 0) {
2058 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
2061 /* Fallthrough on positive return values - already enabled */
2070 * regulator_enable - enable regulator output
2071 * @regulator: regulator source
2073 * Request that the regulator be enabled with the regulator output at
2074 * the predefined voltage or current value. Calls to regulator_enable()
2075 * must be balanced with calls to regulator_disable().
2077 * NOTE: the output value can be set by other drivers, boot loader or may be
2078 * hardwired in the regulator.
2080 int regulator_enable(struct regulator *regulator)
2082 struct regulator_dev *rdev = regulator->rdev;
2085 if (regulator->always_on)
2089 ret = regulator_enable(rdev->supply);
2094 mutex_lock(&rdev->mutex);
2095 ret = _regulator_enable(rdev);
2096 mutex_unlock(&rdev->mutex);
2098 if (ret != 0 && rdev->supply)
2099 regulator_disable(rdev->supply);
2103 EXPORT_SYMBOL_GPL(regulator_enable);
2105 static int _regulator_do_disable(struct regulator_dev *rdev)
2109 trace_regulator_disable(rdev_get_name(rdev));
2111 if (rdev->ena_pin) {
2112 if (rdev->ena_gpio_state) {
2113 ret = regulator_ena_gpio_ctrl(rdev, false);
2116 rdev->ena_gpio_state = 0;
2119 } else if (rdev->desc->ops->disable) {
2120 ret = rdev->desc->ops->disable(rdev);
2125 /* cares about last_off_jiffy only if off_on_delay is required by
2128 if (rdev->desc->off_on_delay)
2129 rdev->last_off_jiffy = jiffies;
2131 trace_regulator_disable_complete(rdev_get_name(rdev));
2136 /* locks held by regulator_disable() */
2137 static int _regulator_disable(struct regulator_dev *rdev)
2141 lockdep_assert_held_once(&rdev->mutex);
2143 if (WARN(rdev->use_count <= 0,
2144 "unbalanced disables for %s\n", rdev_get_name(rdev)))
2147 /* are we the last user and permitted to disable ? */
2148 if (rdev->use_count == 1 &&
2149 (rdev->constraints && !rdev->constraints->always_on)) {
2151 /* we are last user */
2152 if (_regulator_can_change_status(rdev)) {
2153 ret = _notifier_call_chain(rdev,
2154 REGULATOR_EVENT_PRE_DISABLE,
2156 if (ret & NOTIFY_STOP_MASK)
2159 ret = _regulator_do_disable(rdev);
2161 rdev_err(rdev, "failed to disable\n");
2162 _notifier_call_chain(rdev,
2163 REGULATOR_EVENT_ABORT_DISABLE,
2167 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2171 rdev->use_count = 0;
2172 } else if (rdev->use_count > 1) {
2174 if (rdev->constraints &&
2175 (rdev->constraints->valid_ops_mask &
2176 REGULATOR_CHANGE_DRMS))
2177 drms_uA_update(rdev);
2186 * regulator_disable - disable regulator output
2187 * @regulator: regulator source
2189 * Disable the regulator output voltage or current. Calls to
2190 * regulator_enable() must be balanced with calls to
2191 * regulator_disable().
2193 * NOTE: this will only disable the regulator output if no other consumer
2194 * devices have it enabled, the regulator device supports disabling and
2195 * machine constraints permit this operation.
2197 int regulator_disable(struct regulator *regulator)
2199 struct regulator_dev *rdev = regulator->rdev;
2202 if (regulator->always_on)
2205 mutex_lock(&rdev->mutex);
2206 ret = _regulator_disable(rdev);
2207 mutex_unlock(&rdev->mutex);
2209 if (ret == 0 && rdev->supply)
2210 regulator_disable(rdev->supply);
2214 EXPORT_SYMBOL_GPL(regulator_disable);
2216 /* locks held by regulator_force_disable() */
2217 static int _regulator_force_disable(struct regulator_dev *rdev)
2221 lockdep_assert_held_once(&rdev->mutex);
2223 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2224 REGULATOR_EVENT_PRE_DISABLE, NULL);
2225 if (ret & NOTIFY_STOP_MASK)
2228 ret = _regulator_do_disable(rdev);
2230 rdev_err(rdev, "failed to force disable\n");
2231 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2232 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2236 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2237 REGULATOR_EVENT_DISABLE, NULL);
2243 * regulator_force_disable - force disable regulator output
2244 * @regulator: regulator source
2246 * Forcibly disable the regulator output voltage or current.
2247 * NOTE: this *will* disable the regulator output even if other consumer
2248 * devices have it enabled. This should be used for situations when device
2249 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2251 int regulator_force_disable(struct regulator *regulator)
2253 struct regulator_dev *rdev = regulator->rdev;
2256 mutex_lock(&rdev->mutex);
2257 regulator->uA_load = 0;
2258 ret = _regulator_force_disable(regulator->rdev);
2259 mutex_unlock(&rdev->mutex);
2262 while (rdev->open_count--)
2263 regulator_disable(rdev->supply);
2267 EXPORT_SYMBOL_GPL(regulator_force_disable);
2269 static void regulator_disable_work(struct work_struct *work)
2271 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2275 mutex_lock(&rdev->mutex);
2277 BUG_ON(!rdev->deferred_disables);
2279 count = rdev->deferred_disables;
2280 rdev->deferred_disables = 0;
2282 for (i = 0; i < count; i++) {
2283 ret = _regulator_disable(rdev);
2285 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2288 mutex_unlock(&rdev->mutex);
2291 for (i = 0; i < count; i++) {
2292 ret = regulator_disable(rdev->supply);
2295 "Supply disable failed: %d\n", ret);
2302 * regulator_disable_deferred - disable regulator output with delay
2303 * @regulator: regulator source
2304 * @ms: miliseconds until the regulator is disabled
2306 * Execute regulator_disable() on the regulator after a delay. This
2307 * is intended for use with devices that require some time to quiesce.
2309 * NOTE: this will only disable the regulator output if no other consumer
2310 * devices have it enabled, the regulator device supports disabling and
2311 * machine constraints permit this operation.
2313 int regulator_disable_deferred(struct regulator *regulator, int ms)
2315 struct regulator_dev *rdev = regulator->rdev;
2318 if (regulator->always_on)
2322 return regulator_disable(regulator);
2324 mutex_lock(&rdev->mutex);
2325 rdev->deferred_disables++;
2326 mutex_unlock(&rdev->mutex);
2328 ret = queue_delayed_work(system_power_efficient_wq,
2329 &rdev->disable_work,
2330 msecs_to_jiffies(ms));
2336 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2338 static int _regulator_is_enabled(struct regulator_dev *rdev)
2340 /* A GPIO control always takes precedence */
2342 return rdev->ena_gpio_state;
2344 /* If we don't know then assume that the regulator is always on */
2345 if (!rdev->desc->ops->is_enabled)
2348 return rdev->desc->ops->is_enabled(rdev);
2351 static int _regulator_list_voltage(struct regulator *regulator,
2352 unsigned selector, int lock)
2354 struct regulator_dev *rdev = regulator->rdev;
2355 const struct regulator_ops *ops = rdev->desc->ops;
2358 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2359 return rdev->desc->fixed_uV;
2361 if (ops->list_voltage) {
2362 if (selector >= rdev->desc->n_voltages)
2365 mutex_lock(&rdev->mutex);
2366 ret = ops->list_voltage(rdev, selector);
2368 mutex_unlock(&rdev->mutex);
2369 } else if (rdev->supply) {
2370 ret = _regulator_list_voltage(rdev->supply, selector, lock);
2376 if (ret < rdev->constraints->min_uV)
2378 else if (ret > rdev->constraints->max_uV)
2386 * regulator_is_enabled - is the regulator output enabled
2387 * @regulator: regulator source
2389 * Returns positive if the regulator driver backing the source/client
2390 * has requested that the device be enabled, zero if it hasn't, else a
2391 * negative errno code.
2393 * Note that the device backing this regulator handle can have multiple
2394 * users, so it might be enabled even if regulator_enable() was never
2395 * called for this particular source.
2397 int regulator_is_enabled(struct regulator *regulator)
2401 if (regulator->always_on)
2404 mutex_lock(®ulator->rdev->mutex);
2405 ret = _regulator_is_enabled(regulator->rdev);
2406 mutex_unlock(®ulator->rdev->mutex);
2410 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2413 * regulator_can_change_voltage - check if regulator can change voltage
2414 * @regulator: regulator source
2416 * Returns positive if the regulator driver backing the source/client
2417 * can change its voltage, false otherwise. Useful for detecting fixed
2418 * or dummy regulators and disabling voltage change logic in the client
2421 int regulator_can_change_voltage(struct regulator *regulator)
2423 struct regulator_dev *rdev = regulator->rdev;
2425 if (rdev->constraints &&
2426 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2427 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2430 if (rdev->desc->continuous_voltage_range &&
2431 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2432 rdev->constraints->min_uV != rdev->constraints->max_uV)
2438 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2441 * regulator_count_voltages - count regulator_list_voltage() selectors
2442 * @regulator: regulator source
2444 * Returns number of selectors, or negative errno. Selectors are
2445 * numbered starting at zero, and typically correspond to bitfields
2446 * in hardware registers.
2448 int regulator_count_voltages(struct regulator *regulator)
2450 struct regulator_dev *rdev = regulator->rdev;
2452 if (rdev->desc->n_voltages)
2453 return rdev->desc->n_voltages;
2458 return regulator_count_voltages(rdev->supply);
2460 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2463 * regulator_list_voltage - enumerate supported voltages
2464 * @regulator: regulator source
2465 * @selector: identify voltage to list
2466 * Context: can sleep
2468 * Returns a voltage that can be passed to @regulator_set_voltage(),
2469 * zero if this selector code can't be used on this system, or a
2472 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2474 return _regulator_list_voltage(regulator, selector, 1);
2476 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2479 * regulator_get_regmap - get the regulator's register map
2480 * @regulator: regulator source
2482 * Returns the register map for the given regulator, or an ERR_PTR value
2483 * if the regulator doesn't use regmap.
2485 struct regmap *regulator_get_regmap(struct regulator *regulator)
2487 struct regmap *map = regulator->rdev->regmap;
2489 return map ? map : ERR_PTR(-EOPNOTSUPP);
2493 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2494 * @regulator: regulator source
2495 * @vsel_reg: voltage selector register, output parameter
2496 * @vsel_mask: mask for voltage selector bitfield, output parameter
2498 * Returns the hardware register offset and bitmask used for setting the
2499 * regulator voltage. This might be useful when configuring voltage-scaling
2500 * hardware or firmware that can make I2C requests behind the kernel's back,
2503 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2504 * and 0 is returned, otherwise a negative errno is returned.
2506 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2508 unsigned *vsel_mask)
2510 struct regulator_dev *rdev = regulator->rdev;
2511 const struct regulator_ops *ops = rdev->desc->ops;
2513 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2516 *vsel_reg = rdev->desc->vsel_reg;
2517 *vsel_mask = rdev->desc->vsel_mask;
2521 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2524 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2525 * @regulator: regulator source
2526 * @selector: identify voltage to list
2528 * Converts the selector to a hardware-specific voltage selector that can be
2529 * directly written to the regulator registers. The address of the voltage
2530 * register can be determined by calling @regulator_get_hardware_vsel_register.
2532 * On error a negative errno is returned.
2534 int regulator_list_hardware_vsel(struct regulator *regulator,
2537 struct regulator_dev *rdev = regulator->rdev;
2538 const struct regulator_ops *ops = rdev->desc->ops;
2540 if (selector >= rdev->desc->n_voltages)
2542 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2547 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2550 * regulator_get_linear_step - return the voltage step size between VSEL values
2551 * @regulator: regulator source
2553 * Returns the voltage step size between VSEL values for linear
2554 * regulators, or return 0 if the regulator isn't a linear regulator.
2556 unsigned int regulator_get_linear_step(struct regulator *regulator)
2558 struct regulator_dev *rdev = regulator->rdev;
2560 return rdev->desc->uV_step;
2562 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2565 * regulator_is_supported_voltage - check if a voltage range can be supported
2567 * @regulator: Regulator to check.
2568 * @min_uV: Minimum required voltage in uV.
2569 * @max_uV: Maximum required voltage in uV.
2571 * Returns a boolean or a negative error code.
2573 int regulator_is_supported_voltage(struct regulator *regulator,
2574 int min_uV, int max_uV)
2576 struct regulator_dev *rdev = regulator->rdev;
2577 int i, voltages, ret;
2579 /* If we can't change voltage check the current voltage */
2580 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2581 ret = regulator_get_voltage(regulator);
2583 return min_uV <= ret && ret <= max_uV;
2588 /* Any voltage within constrains range is fine? */
2589 if (rdev->desc->continuous_voltage_range)
2590 return min_uV >= rdev->constraints->min_uV &&
2591 max_uV <= rdev->constraints->max_uV;
2593 ret = regulator_count_voltages(regulator);
2598 for (i = 0; i < voltages; i++) {
2599 ret = regulator_list_voltage(regulator, i);
2601 if (ret >= min_uV && ret <= max_uV)
2607 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2609 static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2612 const struct regulator_desc *desc = rdev->desc;
2614 if (desc->ops->map_voltage)
2615 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2617 if (desc->ops->list_voltage == regulator_list_voltage_linear)
2618 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2620 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2621 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2623 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2626 static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2627 int min_uV, int max_uV,
2630 struct pre_voltage_change_data data;
2633 data.old_uV = _regulator_get_voltage(rdev);
2634 data.min_uV = min_uV;
2635 data.max_uV = max_uV;
2636 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2638 if (ret & NOTIFY_STOP_MASK)
2641 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2645 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2646 (void *)data.old_uV);
2651 static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2652 int uV, unsigned selector)
2654 struct pre_voltage_change_data data;
2657 data.old_uV = _regulator_get_voltage(rdev);
2660 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2662 if (ret & NOTIFY_STOP_MASK)
2665 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2669 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2670 (void *)data.old_uV);
2675 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2676 int min_uV, int max_uV)
2681 unsigned int selector;
2682 int old_selector = -1;
2684 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2686 min_uV += rdev->constraints->uV_offset;
2687 max_uV += rdev->constraints->uV_offset;
2690 * If we can't obtain the old selector there is not enough
2691 * info to call set_voltage_time_sel().
2693 if (_regulator_is_enabled(rdev) &&
2694 rdev->desc->ops->set_voltage_time_sel &&
2695 rdev->desc->ops->get_voltage_sel) {
2696 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2697 if (old_selector < 0)
2698 return old_selector;
2701 if (rdev->desc->ops->set_voltage) {
2702 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2706 if (rdev->desc->ops->list_voltage)
2707 best_val = rdev->desc->ops->list_voltage(rdev,
2710 best_val = _regulator_get_voltage(rdev);
2713 } else if (rdev->desc->ops->set_voltage_sel) {
2714 ret = regulator_map_voltage(rdev, min_uV, max_uV);
2716 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2717 if (min_uV <= best_val && max_uV >= best_val) {
2719 if (old_selector == selector)
2722 ret = _regulator_call_set_voltage_sel(
2723 rdev, best_val, selector);
2732 /* Call set_voltage_time_sel if successfully obtained old_selector */
2733 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2734 && old_selector != selector) {
2736 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2737 old_selector, selector);
2739 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2744 /* Insert any necessary delays */
2745 if (delay >= 1000) {
2746 mdelay(delay / 1000);
2747 udelay(delay % 1000);
2753 if (ret == 0 && best_val >= 0) {
2754 unsigned long data = best_val;
2756 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2760 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2765 static int regulator_set_voltage_unlocked(struct regulator *regulator,
2766 int min_uV, int max_uV)
2768 struct regulator_dev *rdev = regulator->rdev;
2770 int old_min_uV, old_max_uV;
2772 int best_supply_uV = 0;
2773 int supply_change_uV = 0;
2775 /* If we're setting the same range as last time the change
2776 * should be a noop (some cpufreq implementations use the same
2777 * voltage for multiple frequencies, for example).
2779 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2782 /* If we're trying to set a range that overlaps the current voltage,
2783 * return successfully even though the regulator does not support
2784 * changing the voltage.
2786 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2787 current_uV = _regulator_get_voltage(rdev);
2788 if (min_uV <= current_uV && current_uV <= max_uV) {
2789 regulator->min_uV = min_uV;
2790 regulator->max_uV = max_uV;
2796 if (!rdev->desc->ops->set_voltage &&
2797 !rdev->desc->ops->set_voltage_sel) {
2802 /* constraints check */
2803 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2807 /* restore original values in case of error */
2808 old_min_uV = regulator->min_uV;
2809 old_max_uV = regulator->max_uV;
2810 regulator->min_uV = min_uV;
2811 regulator->max_uV = max_uV;
2813 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2817 if (rdev->supply && (rdev->desc->min_dropout_uV ||
2818 !rdev->desc->ops->get_voltage)) {
2819 int current_supply_uV;
2822 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2828 best_supply_uV = _regulator_list_voltage(regulator, selector, 0);
2829 if (best_supply_uV < 0) {
2830 ret = best_supply_uV;
2834 best_supply_uV += rdev->desc->min_dropout_uV;
2836 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2837 if (current_supply_uV < 0) {
2838 ret = current_supply_uV;
2842 supply_change_uV = best_supply_uV - current_supply_uV;
2845 if (supply_change_uV > 0) {
2846 ret = regulator_set_voltage_unlocked(rdev->supply,
2847 best_supply_uV, INT_MAX);
2849 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
2855 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2859 if (supply_change_uV < 0) {
2860 ret = regulator_set_voltage_unlocked(rdev->supply,
2861 best_supply_uV, INT_MAX);
2863 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
2865 /* No need to fail here */
2872 regulator->min_uV = old_min_uV;
2873 regulator->max_uV = old_max_uV;
2879 * regulator_set_voltage - set regulator output voltage
2880 * @regulator: regulator source
2881 * @min_uV: Minimum required voltage in uV
2882 * @max_uV: Maximum acceptable voltage in uV
2884 * Sets a voltage regulator to the desired output voltage. This can be set
2885 * during any regulator state. IOW, regulator can be disabled or enabled.
2887 * If the regulator is enabled then the voltage will change to the new value
2888 * immediately otherwise if the regulator is disabled the regulator will
2889 * output at the new voltage when enabled.
2891 * NOTE: If the regulator is shared between several devices then the lowest
2892 * request voltage that meets the system constraints will be used.
2893 * Regulator system constraints must be set for this regulator before
2894 * calling this function otherwise this call will fail.
2896 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2900 regulator_lock_supply(regulator->rdev);
2902 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
2904 regulator_unlock_supply(regulator->rdev);
2908 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2911 * regulator_set_voltage_time - get raise/fall time
2912 * @regulator: regulator source
2913 * @old_uV: starting voltage in microvolts
2914 * @new_uV: target voltage in microvolts
2916 * Provided with the starting and ending voltage, this function attempts to
2917 * calculate the time in microseconds required to rise or fall to this new
2920 int regulator_set_voltage_time(struct regulator *regulator,
2921 int old_uV, int new_uV)
2923 struct regulator_dev *rdev = regulator->rdev;
2924 const struct regulator_ops *ops = rdev->desc->ops;
2930 /* Currently requires operations to do this */
2931 if (!ops->list_voltage || !ops->set_voltage_time_sel
2932 || !rdev->desc->n_voltages)
2935 for (i = 0; i < rdev->desc->n_voltages; i++) {
2936 /* We only look for exact voltage matches here */
2937 voltage = regulator_list_voltage(regulator, i);
2942 if (voltage == old_uV)
2944 if (voltage == new_uV)
2948 if (old_sel < 0 || new_sel < 0)
2951 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2953 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2956 * regulator_set_voltage_time_sel - get raise/fall time
2957 * @rdev: regulator source device
2958 * @old_selector: selector for starting voltage
2959 * @new_selector: selector for target voltage
2961 * Provided with the starting and target voltage selectors, this function
2962 * returns time in microseconds required to rise or fall to this new voltage
2964 * Drivers providing ramp_delay in regulation_constraints can use this as their
2965 * set_voltage_time_sel() operation.
2967 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2968 unsigned int old_selector,
2969 unsigned int new_selector)
2971 unsigned int ramp_delay = 0;
2972 int old_volt, new_volt;
2974 if (rdev->constraints->ramp_delay)
2975 ramp_delay = rdev->constraints->ramp_delay;
2976 else if (rdev->desc->ramp_delay)
2977 ramp_delay = rdev->desc->ramp_delay;
2979 if (ramp_delay == 0) {
2980 rdev_warn(rdev, "ramp_delay not set\n");
2985 if (!rdev->desc->ops->list_voltage)
2988 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2989 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2991 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2993 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2996 * regulator_sync_voltage - re-apply last regulator output voltage
2997 * @regulator: regulator source
2999 * Re-apply the last configured voltage. This is intended to be used
3000 * where some external control source the consumer is cooperating with
3001 * has caused the configured voltage to change.
3003 int regulator_sync_voltage(struct regulator *regulator)
3005 struct regulator_dev *rdev = regulator->rdev;
3006 int ret, min_uV, max_uV;
3008 mutex_lock(&rdev->mutex);
3010 if (!rdev->desc->ops->set_voltage &&
3011 !rdev->desc->ops->set_voltage_sel) {
3016 /* This is only going to work if we've had a voltage configured. */
3017 if (!regulator->min_uV && !regulator->max_uV) {
3022 min_uV = regulator->min_uV;
3023 max_uV = regulator->max_uV;
3025 /* This should be a paranoia check... */
3026 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3030 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
3034 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3037 mutex_unlock(&rdev->mutex);
3040 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3042 static int _regulator_get_voltage(struct regulator_dev *rdev)
3046 if (rdev->desc->ops->get_voltage_sel) {
3047 sel = rdev->desc->ops->get_voltage_sel(rdev);
3050 ret = rdev->desc->ops->list_voltage(rdev, sel);
3051 } else if (rdev->desc->ops->get_voltage) {
3052 ret = rdev->desc->ops->get_voltage(rdev);
3053 } else if (rdev->desc->ops->list_voltage) {
3054 ret = rdev->desc->ops->list_voltage(rdev, 0);
3055 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3056 ret = rdev->desc->fixed_uV;
3057 } else if (rdev->supply) {
3058 ret = _regulator_get_voltage(rdev->supply->rdev);
3065 return ret - rdev->constraints->uV_offset;
3069 * regulator_get_voltage - get regulator output voltage
3070 * @regulator: regulator source
3072 * This returns the current regulator voltage in uV.
3074 * NOTE: If the regulator is disabled it will return the voltage value. This
3075 * function should not be used to determine regulator state.
3077 int regulator_get_voltage(struct regulator *regulator)
3081 regulator_lock_supply(regulator->rdev);
3083 ret = _regulator_get_voltage(regulator->rdev);
3085 regulator_unlock_supply(regulator->rdev);
3089 EXPORT_SYMBOL_GPL(regulator_get_voltage);
3092 * regulator_set_current_limit - set regulator output current limit
3093 * @regulator: regulator source
3094 * @min_uA: Minimum supported current in uA
3095 * @max_uA: Maximum supported current in uA
3097 * Sets current sink to the desired output current. This can be set during
3098 * any regulator state. IOW, regulator can be disabled or enabled.
3100 * If the regulator is enabled then the current will change to the new value
3101 * immediately otherwise if the regulator is disabled the regulator will
3102 * output at the new current when enabled.
3104 * NOTE: Regulator system constraints must be set for this regulator before
3105 * calling this function otherwise this call will fail.
3107 int regulator_set_current_limit(struct regulator *regulator,
3108 int min_uA, int max_uA)
3110 struct regulator_dev *rdev = regulator->rdev;
3113 mutex_lock(&rdev->mutex);
3116 if (!rdev->desc->ops->set_current_limit) {
3121 /* constraints check */
3122 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3126 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3128 mutex_unlock(&rdev->mutex);
3131 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3133 static int _regulator_get_current_limit(struct regulator_dev *rdev)
3137 mutex_lock(&rdev->mutex);
3140 if (!rdev->desc->ops->get_current_limit) {
3145 ret = rdev->desc->ops->get_current_limit(rdev);
3147 mutex_unlock(&rdev->mutex);
3152 * regulator_get_current_limit - get regulator output current
3153 * @regulator: regulator source
3155 * This returns the current supplied by the specified current sink in uA.
3157 * NOTE: If the regulator is disabled it will return the current value. This
3158 * function should not be used to determine regulator state.
3160 int regulator_get_current_limit(struct regulator *regulator)
3162 return _regulator_get_current_limit(regulator->rdev);
3164 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3167 * regulator_set_mode - set regulator operating mode
3168 * @regulator: regulator source
3169 * @mode: operating mode - one of the REGULATOR_MODE constants
3171 * Set regulator operating mode to increase regulator efficiency or improve
3172 * regulation performance.
3174 * NOTE: Regulator system constraints must be set for this regulator before
3175 * calling this function otherwise this call will fail.
3177 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3179 struct regulator_dev *rdev = regulator->rdev;
3181 int regulator_curr_mode;
3183 mutex_lock(&rdev->mutex);
3186 if (!rdev->desc->ops->set_mode) {
3191 /* return if the same mode is requested */
3192 if (rdev->desc->ops->get_mode) {
3193 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3194 if (regulator_curr_mode == mode) {
3200 /* constraints check */
3201 ret = regulator_mode_constrain(rdev, &mode);
3205 ret = rdev->desc->ops->set_mode(rdev, mode);
3207 mutex_unlock(&rdev->mutex);
3210 EXPORT_SYMBOL_GPL(regulator_set_mode);
3212 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3216 mutex_lock(&rdev->mutex);
3219 if (!rdev->desc->ops->get_mode) {
3224 ret = rdev->desc->ops->get_mode(rdev);
3226 mutex_unlock(&rdev->mutex);
3231 * regulator_get_mode - get regulator operating mode
3232 * @regulator: regulator source
3234 * Get the current regulator operating mode.
3236 unsigned int regulator_get_mode(struct regulator *regulator)
3238 return _regulator_get_mode(regulator->rdev);
3240 EXPORT_SYMBOL_GPL(regulator_get_mode);
3243 * regulator_set_load - set regulator load
3244 * @regulator: regulator source
3245 * @uA_load: load current
3247 * Notifies the regulator core of a new device load. This is then used by
3248 * DRMS (if enabled by constraints) to set the most efficient regulator
3249 * operating mode for the new regulator loading.
3251 * Consumer devices notify their supply regulator of the maximum power
3252 * they will require (can be taken from device datasheet in the power
3253 * consumption tables) when they change operational status and hence power
3254 * state. Examples of operational state changes that can affect power
3255 * consumption are :-
3257 * o Device is opened / closed.
3258 * o Device I/O is about to begin or has just finished.
3259 * o Device is idling in between work.
3261 * This information is also exported via sysfs to userspace.
3263 * DRMS will sum the total requested load on the regulator and change
3264 * to the most efficient operating mode if platform constraints allow.
3266 * On error a negative errno is returned.
3268 int regulator_set_load(struct regulator *regulator, int uA_load)
3270 struct regulator_dev *rdev = regulator->rdev;
3273 mutex_lock(&rdev->mutex);
3274 regulator->uA_load = uA_load;
3275 ret = drms_uA_update(rdev);
3276 mutex_unlock(&rdev->mutex);
3280 EXPORT_SYMBOL_GPL(regulator_set_load);
3283 * regulator_allow_bypass - allow the regulator to go into bypass mode
3285 * @regulator: Regulator to configure
3286 * @enable: enable or disable bypass mode
3288 * Allow the regulator to go into bypass mode if all other consumers
3289 * for the regulator also enable bypass mode and the machine
3290 * constraints allow this. Bypass mode means that the regulator is
3291 * simply passing the input directly to the output with no regulation.
3293 int regulator_allow_bypass(struct regulator *regulator, bool enable)
3295 struct regulator_dev *rdev = regulator->rdev;
3298 if (!rdev->desc->ops->set_bypass)
3301 if (rdev->constraints &&
3302 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3305 mutex_lock(&rdev->mutex);
3307 if (enable && !regulator->bypass) {
3308 rdev->bypass_count++;
3310 if (rdev->bypass_count == rdev->open_count) {
3311 ret = rdev->desc->ops->set_bypass(rdev, enable);
3313 rdev->bypass_count--;
3316 } else if (!enable && regulator->bypass) {
3317 rdev->bypass_count--;
3319 if (rdev->bypass_count != rdev->open_count) {
3320 ret = rdev->desc->ops->set_bypass(rdev, enable);
3322 rdev->bypass_count++;
3327 regulator->bypass = enable;
3329 mutex_unlock(&rdev->mutex);
3333 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3336 * regulator_register_notifier - register regulator event notifier
3337 * @regulator: regulator source
3338 * @nb: notifier block
3340 * Register notifier block to receive regulator events.
3342 int regulator_register_notifier(struct regulator *regulator,
3343 struct notifier_block *nb)
3345 return blocking_notifier_chain_register(®ulator->rdev->notifier,
3348 EXPORT_SYMBOL_GPL(regulator_register_notifier);
3351 * regulator_unregister_notifier - unregister regulator event notifier
3352 * @regulator: regulator source
3353 * @nb: notifier block
3355 * Unregister regulator event notifier block.
3357 int regulator_unregister_notifier(struct regulator *regulator,
3358 struct notifier_block *nb)
3360 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
3363 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3365 /* notify regulator consumers and downstream regulator consumers.
3366 * Note mutex must be held by caller.
3368 static int _notifier_call_chain(struct regulator_dev *rdev,
3369 unsigned long event, void *data)
3371 /* call rdev chain first */
3372 return blocking_notifier_call_chain(&rdev->notifier, event, data);
3376 * regulator_bulk_get - get multiple regulator consumers
3378 * @dev: Device to supply
3379 * @num_consumers: Number of consumers to register
3380 * @consumers: Configuration of consumers; clients are stored here.
3382 * @return 0 on success, an errno on failure.
3384 * This helper function allows drivers to get several regulator
3385 * consumers in one operation. If any of the regulators cannot be
3386 * acquired then any regulators that were allocated will be freed
3387 * before returning to the caller.
3389 int regulator_bulk_get(struct device *dev, int num_consumers,
3390 struct regulator_bulk_data *consumers)
3395 for (i = 0; i < num_consumers; i++)
3396 consumers[i].consumer = NULL;
3398 for (i = 0; i < num_consumers; i++) {
3399 consumers[i].consumer = regulator_get(dev,
3400 consumers[i].supply);
3401 if (IS_ERR(consumers[i].consumer)) {
3402 ret = PTR_ERR(consumers[i].consumer);
3403 dev_err(dev, "Failed to get supply '%s': %d\n",
3404 consumers[i].supply, ret);
3405 consumers[i].consumer = NULL;
3414 regulator_put(consumers[i].consumer);
3418 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3420 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3422 struct regulator_bulk_data *bulk = data;
3424 bulk->ret = regulator_enable(bulk->consumer);
3428 * regulator_bulk_enable - enable multiple regulator consumers
3430 * @num_consumers: Number of consumers
3431 * @consumers: Consumer data; clients are stored here.
3432 * @return 0 on success, an errno on failure
3434 * This convenience API allows consumers to enable multiple regulator
3435 * clients in a single API call. If any consumers cannot be enabled
3436 * then any others that were enabled will be disabled again prior to
3439 int regulator_bulk_enable(int num_consumers,
3440 struct regulator_bulk_data *consumers)
3442 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3446 for (i = 0; i < num_consumers; i++) {
3447 if (consumers[i].consumer->always_on)
3448 consumers[i].ret = 0;
3450 async_schedule_domain(regulator_bulk_enable_async,
3451 &consumers[i], &async_domain);
3454 async_synchronize_full_domain(&async_domain);
3456 /* If any consumer failed we need to unwind any that succeeded */
3457 for (i = 0; i < num_consumers; i++) {
3458 if (consumers[i].ret != 0) {
3459 ret = consumers[i].ret;
3467 for (i = 0; i < num_consumers; i++) {
3468 if (consumers[i].ret < 0)
3469 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3472 regulator_disable(consumers[i].consumer);
3477 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3480 * regulator_bulk_disable - disable multiple regulator consumers
3482 * @num_consumers: Number of consumers
3483 * @consumers: Consumer data; clients are stored here.
3484 * @return 0 on success, an errno on failure
3486 * This convenience API allows consumers to disable multiple regulator
3487 * clients in a single API call. If any consumers cannot be disabled
3488 * then any others that were disabled will be enabled again prior to
3491 int regulator_bulk_disable(int num_consumers,
3492 struct regulator_bulk_data *consumers)
3497 for (i = num_consumers - 1; i >= 0; --i) {
3498 ret = regulator_disable(consumers[i].consumer);
3506 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3507 for (++i; i < num_consumers; ++i) {
3508 r = regulator_enable(consumers[i].consumer);
3510 pr_err("Failed to reename %s: %d\n",
3511 consumers[i].supply, r);
3516 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3519 * regulator_bulk_force_disable - force disable multiple regulator consumers
3521 * @num_consumers: Number of consumers
3522 * @consumers: Consumer data; clients are stored here.
3523 * @return 0 on success, an errno on failure
3525 * This convenience API allows consumers to forcibly disable multiple regulator
3526 * clients in a single API call.
3527 * NOTE: This should be used for situations when device damage will
3528 * likely occur if the regulators are not disabled (e.g. over temp).
3529 * Although regulator_force_disable function call for some consumers can
3530 * return error numbers, the function is called for all consumers.
3532 int regulator_bulk_force_disable(int num_consumers,
3533 struct regulator_bulk_data *consumers)
3538 for (i = 0; i < num_consumers; i++)
3540 regulator_force_disable(consumers[i].consumer);
3542 for (i = 0; i < num_consumers; i++) {
3543 if (consumers[i].ret != 0) {
3544 ret = consumers[i].ret;
3553 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3556 * regulator_bulk_free - free multiple regulator consumers
3558 * @num_consumers: Number of consumers
3559 * @consumers: Consumer data; clients are stored here.
3561 * This convenience API allows consumers to free multiple regulator
3562 * clients in a single API call.
3564 void regulator_bulk_free(int num_consumers,
3565 struct regulator_bulk_data *consumers)
3569 for (i = 0; i < num_consumers; i++) {
3570 regulator_put(consumers[i].consumer);
3571 consumers[i].consumer = NULL;
3574 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3577 * regulator_notifier_call_chain - call regulator event notifier
3578 * @rdev: regulator source
3579 * @event: notifier block
3580 * @data: callback-specific data.
3582 * Called by regulator drivers to notify clients a regulator event has
3583 * occurred. We also notify regulator clients downstream.
3584 * Note lock must be held by caller.
3586 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3587 unsigned long event, void *data)
3589 lockdep_assert_held_once(&rdev->mutex);
3591 _notifier_call_chain(rdev, event, data);
3595 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3598 * regulator_mode_to_status - convert a regulator mode into a status
3600 * @mode: Mode to convert
3602 * Convert a regulator mode into a status.
3604 int regulator_mode_to_status(unsigned int mode)
3607 case REGULATOR_MODE_FAST:
3608 return REGULATOR_STATUS_FAST;
3609 case REGULATOR_MODE_NORMAL:
3610 return REGULATOR_STATUS_NORMAL;
3611 case REGULATOR_MODE_IDLE:
3612 return REGULATOR_STATUS_IDLE;
3613 case REGULATOR_MODE_STANDBY:
3614 return REGULATOR_STATUS_STANDBY;
3616 return REGULATOR_STATUS_UNDEFINED;
3619 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3621 static struct attribute *regulator_dev_attrs[] = {
3622 &dev_attr_name.attr,
3623 &dev_attr_num_users.attr,
3624 &dev_attr_type.attr,
3625 &dev_attr_microvolts.attr,
3626 &dev_attr_microamps.attr,
3627 &dev_attr_opmode.attr,
3628 &dev_attr_state.attr,
3629 &dev_attr_status.attr,
3630 &dev_attr_bypass.attr,
3631 &dev_attr_requested_microamps.attr,
3632 &dev_attr_min_microvolts.attr,
3633 &dev_attr_max_microvolts.attr,
3634 &dev_attr_min_microamps.attr,
3635 &dev_attr_max_microamps.attr,
3636 &dev_attr_suspend_standby_state.attr,
3637 &dev_attr_suspend_mem_state.attr,
3638 &dev_attr_suspend_disk_state.attr,
3639 &dev_attr_suspend_standby_microvolts.attr,
3640 &dev_attr_suspend_mem_microvolts.attr,
3641 &dev_attr_suspend_disk_microvolts.attr,
3642 &dev_attr_suspend_standby_mode.attr,
3643 &dev_attr_suspend_mem_mode.attr,
3644 &dev_attr_suspend_disk_mode.attr,
3649 * To avoid cluttering sysfs (and memory) with useless state, only
3650 * create attributes that can be meaningfully displayed.
3652 static umode_t regulator_attr_is_visible(struct kobject *kobj,
3653 struct attribute *attr, int idx)
3655 struct device *dev = kobj_to_dev(kobj);
3656 struct regulator_dev *rdev = container_of(dev, struct regulator_dev, dev);
3657 const struct regulator_ops *ops = rdev->desc->ops;
3658 umode_t mode = attr->mode;
3660 /* these three are always present */
3661 if (attr == &dev_attr_name.attr ||
3662 attr == &dev_attr_num_users.attr ||
3663 attr == &dev_attr_type.attr)
3666 /* some attributes need specific methods to be displayed */
3667 if (attr == &dev_attr_microvolts.attr) {
3668 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3669 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3670 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3671 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3676 if (attr == &dev_attr_microamps.attr)
3677 return ops->get_current_limit ? mode : 0;
3679 if (attr == &dev_attr_opmode.attr)
3680 return ops->get_mode ? mode : 0;
3682 if (attr == &dev_attr_state.attr)
3683 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3685 if (attr == &dev_attr_status.attr)
3686 return ops->get_status ? mode : 0;
3688 if (attr == &dev_attr_bypass.attr)
3689 return ops->get_bypass ? mode : 0;
3691 /* some attributes are type-specific */
3692 if (attr == &dev_attr_requested_microamps.attr)
3693 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
3695 /* constraints need specific supporting methods */
3696 if (attr == &dev_attr_min_microvolts.attr ||
3697 attr == &dev_attr_max_microvolts.attr)
3698 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3700 if (attr == &dev_attr_min_microamps.attr ||
3701 attr == &dev_attr_max_microamps.attr)
3702 return ops->set_current_limit ? mode : 0;
3704 if (attr == &dev_attr_suspend_standby_state.attr ||
3705 attr == &dev_attr_suspend_mem_state.attr ||
3706 attr == &dev_attr_suspend_disk_state.attr)
3709 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3710 attr == &dev_attr_suspend_mem_microvolts.attr ||
3711 attr == &dev_attr_suspend_disk_microvolts.attr)
3712 return ops->set_suspend_voltage ? mode : 0;
3714 if (attr == &dev_attr_suspend_standby_mode.attr ||
3715 attr == &dev_attr_suspend_mem_mode.attr ||
3716 attr == &dev_attr_suspend_disk_mode.attr)
3717 return ops->set_suspend_mode ? mode : 0;
3722 static const struct attribute_group regulator_dev_group = {
3723 .attrs = regulator_dev_attrs,
3724 .is_visible = regulator_attr_is_visible,
3727 static const struct attribute_group *regulator_dev_groups[] = {
3728 ®ulator_dev_group,
3732 static void regulator_dev_release(struct device *dev)
3734 struct regulator_dev *rdev = dev_get_drvdata(dev);
3736 kfree(rdev->constraints);
3737 of_node_put(rdev->dev.of_node);
3741 static struct class regulator_class = {
3742 .name = "regulator",
3743 .dev_release = regulator_dev_release,
3744 .dev_groups = regulator_dev_groups,
3747 static void rdev_init_debugfs(struct regulator_dev *rdev)
3749 struct device *parent = rdev->dev.parent;
3750 const char *rname = rdev_get_name(rdev);
3751 char name[NAME_MAX];
3753 /* Avoid duplicate debugfs directory names */
3754 if (parent && rname == rdev->desc->name) {
3755 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3760 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
3761 if (!rdev->debugfs) {
3762 rdev_warn(rdev, "Failed to create debugfs directory\n");
3766 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3768 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3770 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3771 &rdev->bypass_count);
3775 * regulator_register - register regulator
3776 * @regulator_desc: regulator to register
3777 * @cfg: runtime configuration for regulator
3779 * Called by regulator drivers to register a regulator.
3780 * Returns a valid pointer to struct regulator_dev on success
3781 * or an ERR_PTR() on error.
3783 struct regulator_dev *
3784 regulator_register(const struct regulator_desc *regulator_desc,
3785 const struct regulator_config *cfg)
3787 const struct regulation_constraints *constraints = NULL;
3788 const struct regulator_init_data *init_data;
3789 struct regulator_config *config = NULL;
3790 static atomic_t regulator_no = ATOMIC_INIT(-1);
3791 struct regulator_dev *rdev;
3795 if (regulator_desc == NULL || cfg == NULL)
3796 return ERR_PTR(-EINVAL);
3801 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3802 return ERR_PTR(-EINVAL);
3804 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3805 regulator_desc->type != REGULATOR_CURRENT)
3806 return ERR_PTR(-EINVAL);
3808 /* Only one of each should be implemented */
3809 WARN_ON(regulator_desc->ops->get_voltage &&
3810 regulator_desc->ops->get_voltage_sel);
3811 WARN_ON(regulator_desc->ops->set_voltage &&
3812 regulator_desc->ops->set_voltage_sel);
3814 /* If we're using selectors we must implement list_voltage. */
3815 if (regulator_desc->ops->get_voltage_sel &&
3816 !regulator_desc->ops->list_voltage) {
3817 return ERR_PTR(-EINVAL);
3819 if (regulator_desc->ops->set_voltage_sel &&
3820 !regulator_desc->ops->list_voltage) {
3821 return ERR_PTR(-EINVAL);
3824 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3826 return ERR_PTR(-ENOMEM);
3829 * Duplicate the config so the driver could override it after
3830 * parsing init data.
3832 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
3833 if (config == NULL) {
3835 return ERR_PTR(-ENOMEM);
3838 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
3839 &rdev->dev.of_node);
3841 init_data = config->init_data;
3842 rdev->dev.of_node = of_node_get(config->of_node);
3845 mutex_lock(®ulator_list_mutex);
3847 mutex_init(&rdev->mutex);
3848 rdev->reg_data = config->driver_data;
3849 rdev->owner = regulator_desc->owner;
3850 rdev->desc = regulator_desc;
3852 rdev->regmap = config->regmap;
3853 else if (dev_get_regmap(dev, NULL))
3854 rdev->regmap = dev_get_regmap(dev, NULL);
3855 else if (dev->parent)
3856 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3857 INIT_LIST_HEAD(&rdev->consumer_list);
3858 INIT_LIST_HEAD(&rdev->list);
3859 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3860 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3862 /* preform any regulator specific init */
3863 if (init_data && init_data->regulator_init) {
3864 ret = init_data->regulator_init(rdev->reg_data);
3869 /* register with sysfs */
3870 rdev->dev.class = ®ulator_class;
3871 rdev->dev.parent = dev;
3872 dev_set_name(&rdev->dev, "regulator.%lu",
3873 (unsigned long) atomic_inc_return(®ulator_no));
3874 ret = device_register(&rdev->dev);
3876 put_device(&rdev->dev);
3880 dev_set_drvdata(&rdev->dev, rdev);
3882 if ((config->ena_gpio || config->ena_gpio_initialized) &&
3883 gpio_is_valid(config->ena_gpio)) {
3884 ret = regulator_ena_gpio_request(rdev, config);
3886 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3887 config->ena_gpio, ret);
3892 /* set regulator constraints */
3894 constraints = &init_data->constraints;
3896 ret = set_machine_constraints(rdev, constraints);
3900 if (init_data && init_data->supply_regulator)
3901 rdev->supply_name = init_data->supply_regulator;
3902 else if (regulator_desc->supply_name)
3903 rdev->supply_name = regulator_desc->supply_name;
3905 /* add consumers devices */
3907 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3908 ret = set_consumer_device_supply(rdev,
3909 init_data->consumer_supplies[i].dev_name,
3910 init_data->consumer_supplies[i].supply);
3912 dev_err(dev, "Failed to set supply %s\n",
3913 init_data->consumer_supplies[i].supply);
3914 goto unset_supplies;
3919 list_add(&rdev->list, ®ulator_list);
3921 rdev_init_debugfs(rdev);
3923 mutex_unlock(®ulator_list_mutex);
3928 unset_regulator_supplies(rdev);
3931 regulator_ena_gpio_free(rdev);
3932 kfree(rdev->constraints);
3934 device_unregister(&rdev->dev);
3935 /* device core frees rdev */
3936 rdev = ERR_PTR(ret);
3941 rdev = ERR_PTR(ret);
3944 EXPORT_SYMBOL_GPL(regulator_register);
3947 * regulator_unregister - unregister regulator
3948 * @rdev: regulator to unregister
3950 * Called by regulator drivers to unregister a regulator.
3952 void regulator_unregister(struct regulator_dev *rdev)
3958 while (rdev->use_count--)
3959 regulator_disable(rdev->supply);
3960 regulator_put(rdev->supply);
3962 mutex_lock(®ulator_list_mutex);
3963 debugfs_remove_recursive(rdev->debugfs);
3964 flush_work(&rdev->disable_work.work);
3965 WARN_ON(rdev->open_count);
3966 unset_regulator_supplies(rdev);
3967 list_del(&rdev->list);
3968 mutex_unlock(®ulator_list_mutex);
3969 regulator_ena_gpio_free(rdev);
3970 device_unregister(&rdev->dev);
3972 EXPORT_SYMBOL_GPL(regulator_unregister);
3975 * regulator_suspend_prepare - prepare regulators for system wide suspend
3976 * @state: system suspend state
3978 * Configure each regulator with it's suspend operating parameters for state.
3979 * This will usually be called by machine suspend code prior to supending.
3981 int regulator_suspend_prepare(suspend_state_t state)
3983 struct regulator_dev *rdev;
3986 /* ON is handled by regulator active state */
3987 if (state == PM_SUSPEND_ON)
3990 mutex_lock(®ulator_list_mutex);
3991 list_for_each_entry(rdev, ®ulator_list, list) {
3993 mutex_lock(&rdev->mutex);
3994 ret = suspend_prepare(rdev, state);
3995 mutex_unlock(&rdev->mutex);
3998 rdev_err(rdev, "failed to prepare\n");
4003 mutex_unlock(®ulator_list_mutex);
4006 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
4009 * regulator_suspend_finish - resume regulators from system wide suspend
4011 * Turn on regulators that might be turned off by regulator_suspend_prepare
4012 * and that should be turned on according to the regulators properties.
4014 int regulator_suspend_finish(void)
4016 struct regulator_dev *rdev;
4019 mutex_lock(®ulator_list_mutex);
4020 list_for_each_entry(rdev, ®ulator_list, list) {
4021 mutex_lock(&rdev->mutex);
4022 if (rdev->use_count > 0 || rdev->constraints->always_on) {
4023 if (!_regulator_is_enabled(rdev)) {
4024 error = _regulator_do_enable(rdev);
4029 if (!have_full_constraints())
4031 if (!_regulator_is_enabled(rdev))
4034 error = _regulator_do_disable(rdev);
4039 mutex_unlock(&rdev->mutex);
4041 mutex_unlock(®ulator_list_mutex);
4044 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
4047 * regulator_has_full_constraints - the system has fully specified constraints
4049 * Calling this function will cause the regulator API to disable all
4050 * regulators which have a zero use count and don't have an always_on
4051 * constraint in a late_initcall.
4053 * The intention is that this will become the default behaviour in a
4054 * future kernel release so users are encouraged to use this facility
4057 void regulator_has_full_constraints(void)
4059 has_full_constraints = 1;
4061 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4064 * rdev_get_drvdata - get rdev regulator driver data
4067 * Get rdev regulator driver private data. This call can be used in the
4068 * regulator driver context.
4070 void *rdev_get_drvdata(struct regulator_dev *rdev)
4072 return rdev->reg_data;
4074 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4077 * regulator_get_drvdata - get regulator driver data
4078 * @regulator: regulator
4080 * Get regulator driver private data. This call can be used in the consumer
4081 * driver context when non API regulator specific functions need to be called.
4083 void *regulator_get_drvdata(struct regulator *regulator)
4085 return regulator->rdev->reg_data;
4087 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4090 * regulator_set_drvdata - set regulator driver data
4091 * @regulator: regulator
4094 void regulator_set_drvdata(struct regulator *regulator, void *data)
4096 regulator->rdev->reg_data = data;
4098 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4101 * regulator_get_id - get regulator ID
4104 int rdev_get_id(struct regulator_dev *rdev)
4106 return rdev->desc->id;
4108 EXPORT_SYMBOL_GPL(rdev_get_id);
4110 struct device *rdev_get_dev(struct regulator_dev *rdev)
4114 EXPORT_SYMBOL_GPL(rdev_get_dev);
4116 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4118 return reg_init_data->driver_data;
4120 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4122 #ifdef CONFIG_DEBUG_FS
4123 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
4124 size_t count, loff_t *ppos)
4126 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
4127 ssize_t len, ret = 0;
4128 struct regulator_map *map;
4133 list_for_each_entry(map, ®ulator_map_list, list) {
4134 len = snprintf(buf + ret, PAGE_SIZE - ret,
4136 rdev_get_name(map->regulator), map->dev_name,
4140 if (ret > PAGE_SIZE) {
4146 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
4154 static const struct file_operations supply_map_fops = {
4155 #ifdef CONFIG_DEBUG_FS
4156 .read = supply_map_read_file,
4157 .llseek = default_llseek,
4161 #ifdef CONFIG_DEBUG_FS
4162 static void regulator_summary_show_subtree(struct seq_file *s,
4163 struct regulator_dev *rdev,
4166 struct list_head *list = s->private;
4167 struct regulator_dev *child;
4168 struct regulation_constraints *c;
4169 struct regulator *consumer;
4174 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4176 30 - level * 3, rdev_get_name(rdev),
4177 rdev->use_count, rdev->open_count, rdev->bypass_count);
4179 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4180 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
4182 c = rdev->constraints;
4184 switch (rdev->desc->type) {
4185 case REGULATOR_VOLTAGE:
4186 seq_printf(s, "%5dmV %5dmV ",
4187 c->min_uV / 1000, c->max_uV / 1000);
4189 case REGULATOR_CURRENT:
4190 seq_printf(s, "%5dmA %5dmA ",
4191 c->min_uA / 1000, c->max_uA / 1000);
4198 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4199 if (consumer->dev->class == ®ulator_class)
4202 seq_printf(s, "%*s%-*s ",
4203 (level + 1) * 3 + 1, "",
4204 30 - (level + 1) * 3, dev_name(consumer->dev));
4206 switch (rdev->desc->type) {
4207 case REGULATOR_VOLTAGE:
4208 seq_printf(s, "%37dmV %5dmV",
4209 consumer->min_uV / 1000,
4210 consumer->max_uV / 1000);
4212 case REGULATOR_CURRENT:
4219 list_for_each_entry(child, list, list) {
4220 /* handle only non-root regulators supplied by current rdev */
4221 if (!child->supply || child->supply->rdev != rdev)
4224 regulator_summary_show_subtree(s, child, level + 1);
4228 static int regulator_summary_show(struct seq_file *s, void *data)
4230 struct list_head *list = s->private;
4231 struct regulator_dev *rdev;
4233 seq_puts(s, " regulator use open bypass voltage current min max\n");
4234 seq_puts(s, "-------------------------------------------------------------------------------\n");
4236 mutex_lock(®ulator_list_mutex);
4238 list_for_each_entry(rdev, list, list) {
4242 regulator_summary_show_subtree(s, rdev, 0);
4245 mutex_unlock(®ulator_list_mutex);
4250 static int regulator_summary_open(struct inode *inode, struct file *file)
4252 return single_open(file, regulator_summary_show, inode->i_private);
4256 static const struct file_operations regulator_summary_fops = {
4257 #ifdef CONFIG_DEBUG_FS
4258 .open = regulator_summary_open,
4260 .llseek = seq_lseek,
4261 .release = single_release,
4265 static int __init regulator_init(void)
4269 ret = class_register(®ulator_class);
4271 debugfs_root = debugfs_create_dir("regulator", NULL);
4273 pr_warn("regulator: Failed to create debugfs directory\n");
4275 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4278 debugfs_create_file("regulator_summary", 0444, debugfs_root,
4279 ®ulator_list, ®ulator_summary_fops);
4281 regulator_dummy_init();
4286 /* init early to allow our consumers to complete system booting */
4287 core_initcall(regulator_init);
4289 static int __init regulator_late_cleanup(struct device *dev, void *data)
4291 struct regulator_dev *rdev = dev_to_rdev(dev);
4292 const struct regulator_ops *ops = rdev->desc->ops;
4293 struct regulation_constraints *c = rdev->constraints;
4296 if (c && c->always_on)
4299 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
4302 mutex_lock(&rdev->mutex);
4304 if (rdev->use_count)
4307 /* If we can't read the status assume it's on. */
4308 if (ops->is_enabled)
4309 enabled = ops->is_enabled(rdev);
4316 if (have_full_constraints()) {
4317 /* We log since this may kill the system if it goes
4319 rdev_info(rdev, "disabling\n");
4320 ret = _regulator_do_disable(rdev);
4322 rdev_err(rdev, "couldn't disable: %d\n", ret);
4324 /* The intention is that in future we will
4325 * assume that full constraints are provided
4326 * so warn even if we aren't going to do
4329 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4333 mutex_unlock(&rdev->mutex);
4338 static int __init regulator_init_complete(void)
4341 * Since DT doesn't provide an idiomatic mechanism for
4342 * enabling full constraints and since it's much more natural
4343 * with DT to provide them just assume that a DT enabled
4344 * system has full constraints.
4346 if (of_have_populated_dt())
4347 has_full_constraints = true;
4349 /* If we have a full configuration then disable any regulators
4350 * we have permission to change the status for and which are
4351 * not in use or always_on. This is effectively the default
4352 * for DT and ACPI as they have full constraints.
4354 class_for_each_device(®ulator_class, NULL, NULL,
4355 regulator_late_cleanup);
4359 late_initcall_sync(regulator_init_complete);